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7d50195f FHC |
1 | /* |
2 | * Faraday FOTG210 EHCI-like driver | |
3 | * | |
4 | * Copyright (c) 2013 Faraday Technology Corporation | |
5 | * | |
6 | * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com> | |
7 | * Feng-Hsin Chiang <john453@faraday-tech.com> | |
8 | * Po-Yu Chuang <ratbert.chuang@gmail.com> | |
9 | * | |
10 | * Most of code borrowed from the Linux-3.7 EHCI driver | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
19 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software Foundation, | |
24 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/dmapool.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/ioport.h> | |
32 | #include <linux/sched.h> | |
33 | #include <linux/vmalloc.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/hrtimer.h> | |
37 | #include <linux/list.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/usb.h> | |
40 | #include <linux/usb/hcd.h> | |
41 | #include <linux/moduleparam.h> | |
42 | #include <linux/dma-mapping.h> | |
43 | #include <linux/debugfs.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/platform_device.h> | |
47 | #include <linux/io.h> | |
48 | ||
49 | #include <asm/byteorder.h> | |
50 | #include <asm/irq.h> | |
51 | #include <asm/unaligned.h> | |
52 | ||
53 | /*-------------------------------------------------------------------------*/ | |
54 | #define DRIVER_AUTHOR "Yuan-Hsin Chen" | |
55 | #define DRIVER_DESC "FOTG210 Host Controller (EHCI) Driver" | |
56 | ||
57 | static const char hcd_name[] = "fotg210_hcd"; | |
58 | ||
59 | #undef VERBOSE_DEBUG | |
60 | #undef FOTG210_URB_TRACE | |
61 | ||
62 | #ifdef DEBUG | |
63 | #define FOTG210_STATS | |
64 | #endif | |
65 | ||
66 | /* magic numbers that can affect system performance */ | |
67 | #define FOTG210_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */ | |
68 | #define FOTG210_TUNE_RL_HS 4 /* nak throttle; see 4.9 */ | |
69 | #define FOTG210_TUNE_RL_TT 0 | |
70 | #define FOTG210_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */ | |
71 | #define FOTG210_TUNE_MULT_TT 1 | |
72 | /* | |
73 | * Some drivers think it's safe to schedule isochronous transfers more than | |
74 | * 256 ms into the future (partly as a result of an old bug in the scheduling | |
75 | * code). In an attempt to avoid trouble, we will use a minimum scheduling | |
76 | * length of 512 frames instead of 256. | |
77 | */ | |
78 | #define FOTG210_TUNE_FLS 1 /* (medium) 512-frame schedule */ | |
79 | ||
80 | /* Initial IRQ latency: faster than hw default */ | |
81 | static int log2_irq_thresh; /* 0 to 6 */ | |
82 | module_param(log2_irq_thresh, int, S_IRUGO); | |
83 | MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes"); | |
84 | ||
85 | /* initial park setting: slower than hw default */ | |
86 | static unsigned park; | |
87 | module_param(park, uint, S_IRUGO); | |
88 | MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets"); | |
89 | ||
90 | /* for link power management(LPM) feature */ | |
91 | static unsigned int hird; | |
92 | module_param(hird, int, S_IRUGO); | |
93 | MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us"); | |
94 | ||
95 | #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT) | |
96 | ||
97 | #include "fotg210.h" | |
98 | ||
99 | /*-------------------------------------------------------------------------*/ | |
100 | ||
101 | #define fotg210_dbg(fotg210, fmt, args...) \ | |
102 | dev_dbg(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
103 | #define fotg210_err(fotg210, fmt, args...) \ | |
104 | dev_err(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
105 | #define fotg210_info(fotg210, fmt, args...) \ | |
106 | dev_info(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
107 | #define fotg210_warn(fotg210, fmt, args...) \ | |
108 | dev_warn(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
109 | ||
110 | #ifdef VERBOSE_DEBUG | |
111 | # define fotg210_vdbg fotg210_dbg | |
112 | #else | |
113 | static inline void fotg210_vdbg(struct fotg210_hcd *fotg210, ...) {} | |
114 | #endif | |
115 | ||
116 | #ifdef DEBUG | |
117 | ||
118 | /* check the values in the HCSPARAMS register | |
119 | * (host controller _Structural_ parameters) | |
120 | * see EHCI spec, Table 2-4 for each value | |
121 | */ | |
122 | static void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label) | |
123 | { | |
124 | u32 params = fotg210_readl(fotg210, &fotg210->caps->hcs_params); | |
125 | ||
126 | fotg210_dbg(fotg210, | |
127 | "%s hcs_params 0x%x ports=%d\n", | |
128 | label, params, | |
129 | HCS_N_PORTS(params) | |
130 | ); | |
131 | } | |
132 | #else | |
133 | ||
134 | static inline void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label) {} | |
135 | ||
136 | #endif | |
137 | ||
138 | #ifdef DEBUG | |
139 | ||
140 | /* check the values in the HCCPARAMS register | |
141 | * (host controller _Capability_ parameters) | |
142 | * see EHCI Spec, Table 2-5 for each value | |
143 | * */ | |
144 | static void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label) | |
145 | { | |
146 | u32 params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
147 | ||
148 | fotg210_dbg(fotg210, | |
149 | "%s hcc_params %04x uframes %s%s\n", | |
150 | label, | |
151 | params, | |
152 | HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024", | |
153 | HCC_CANPARK(params) ? " park" : ""); | |
154 | } | |
155 | #else | |
156 | ||
157 | static inline void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label) {} | |
158 | ||
159 | #endif | |
160 | ||
161 | #ifdef DEBUG | |
162 | ||
163 | static void __maybe_unused | |
164 | dbg_qtd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd) | |
165 | { | |
166 | fotg210_dbg(fotg210, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd, | |
167 | hc32_to_cpup(fotg210, &qtd->hw_next), | |
168 | hc32_to_cpup(fotg210, &qtd->hw_alt_next), | |
169 | hc32_to_cpup(fotg210, &qtd->hw_token), | |
170 | hc32_to_cpup(fotg210, &qtd->hw_buf[0])); | |
171 | if (qtd->hw_buf[1]) | |
172 | fotg210_dbg(fotg210, " p1=%08x p2=%08x p3=%08x p4=%08x\n", | |
173 | hc32_to_cpup(fotg210, &qtd->hw_buf[1]), | |
174 | hc32_to_cpup(fotg210, &qtd->hw_buf[2]), | |
175 | hc32_to_cpup(fotg210, &qtd->hw_buf[3]), | |
176 | hc32_to_cpup(fotg210, &qtd->hw_buf[4])); | |
177 | } | |
178 | ||
179 | static void __maybe_unused | |
180 | dbg_qh(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
181 | { | |
182 | struct fotg210_qh_hw *hw = qh->hw; | |
183 | ||
184 | fotg210_dbg(fotg210, "%s qh %p n%08x info %x %x qtd %x\n", label, | |
185 | qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current); | |
186 | dbg_qtd("overlay", fotg210, (struct fotg210_qtd *) &hw->hw_qtd_next); | |
187 | } | |
188 | ||
189 | static void __maybe_unused | |
190 | dbg_itd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_itd *itd) | |
191 | { | |
192 | fotg210_dbg(fotg210, "%s[%d] itd %p, next %08x, urb %p\n", | |
193 | label, itd->frame, itd, hc32_to_cpu(fotg210, itd->hw_next), | |
194 | itd->urb); | |
195 | fotg210_dbg(fotg210, | |
196 | " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
197 | hc32_to_cpu(fotg210, itd->hw_transaction[0]), | |
198 | hc32_to_cpu(fotg210, itd->hw_transaction[1]), | |
199 | hc32_to_cpu(fotg210, itd->hw_transaction[2]), | |
200 | hc32_to_cpu(fotg210, itd->hw_transaction[3]), | |
201 | hc32_to_cpu(fotg210, itd->hw_transaction[4]), | |
202 | hc32_to_cpu(fotg210, itd->hw_transaction[5]), | |
203 | hc32_to_cpu(fotg210, itd->hw_transaction[6]), | |
204 | hc32_to_cpu(fotg210, itd->hw_transaction[7])); | |
205 | fotg210_dbg(fotg210, | |
206 | " buf: %08x %08x %08x %08x %08x %08x %08x\n", | |
207 | hc32_to_cpu(fotg210, itd->hw_bufp[0]), | |
208 | hc32_to_cpu(fotg210, itd->hw_bufp[1]), | |
209 | hc32_to_cpu(fotg210, itd->hw_bufp[2]), | |
210 | hc32_to_cpu(fotg210, itd->hw_bufp[3]), | |
211 | hc32_to_cpu(fotg210, itd->hw_bufp[4]), | |
212 | hc32_to_cpu(fotg210, itd->hw_bufp[5]), | |
213 | hc32_to_cpu(fotg210, itd->hw_bufp[6])); | |
214 | fotg210_dbg(fotg210, " index: %d %d %d %d %d %d %d %d\n", | |
215 | itd->index[0], itd->index[1], itd->index[2], | |
216 | itd->index[3], itd->index[4], itd->index[5], | |
217 | itd->index[6], itd->index[7]); | |
218 | } | |
219 | ||
220 | static int __maybe_unused | |
221 | dbg_status_buf(char *buf, unsigned len, const char *label, u32 status) | |
222 | { | |
223 | return scnprintf(buf, len, | |
224 | "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s", | |
225 | label, label[0] ? " " : "", status, | |
226 | (status & STS_ASS) ? " Async" : "", | |
227 | (status & STS_PSS) ? " Periodic" : "", | |
228 | (status & STS_RECL) ? " Recl" : "", | |
229 | (status & STS_HALT) ? " Halt" : "", | |
230 | (status & STS_IAA) ? " IAA" : "", | |
231 | (status & STS_FATAL) ? " FATAL" : "", | |
232 | (status & STS_FLR) ? " FLR" : "", | |
233 | (status & STS_PCD) ? " PCD" : "", | |
234 | (status & STS_ERR) ? " ERR" : "", | |
235 | (status & STS_INT) ? " INT" : "" | |
236 | ); | |
237 | } | |
238 | ||
239 | static int __maybe_unused | |
240 | dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable) | |
241 | { | |
242 | return scnprintf(buf, len, | |
243 | "%s%sintrenable %02x%s%s%s%s%s%s", | |
244 | label, label[0] ? " " : "", enable, | |
245 | (enable & STS_IAA) ? " IAA" : "", | |
246 | (enable & STS_FATAL) ? " FATAL" : "", | |
247 | (enable & STS_FLR) ? " FLR" : "", | |
248 | (enable & STS_PCD) ? " PCD" : "", | |
249 | (enable & STS_ERR) ? " ERR" : "", | |
250 | (enable & STS_INT) ? " INT" : "" | |
251 | ); | |
252 | } | |
253 | ||
254 | static const char *const fls_strings[] = { "1024", "512", "256", "??" }; | |
255 | ||
256 | static int | |
257 | dbg_command_buf(char *buf, unsigned len, const char *label, u32 command) | |
258 | { | |
259 | return scnprintf(buf, len, | |
260 | "%s%scommand %07x %s=%d ithresh=%d%s%s%s " | |
261 | "period=%s%s %s", | |
262 | label, label[0] ? " " : "", command, | |
263 | (command & CMD_PARK) ? " park" : "(park)", | |
264 | CMD_PARK_CNT(command), | |
265 | (command >> 16) & 0x3f, | |
266 | (command & CMD_IAAD) ? " IAAD" : "", | |
267 | (command & CMD_ASE) ? " Async" : "", | |
268 | (command & CMD_PSE) ? " Periodic" : "", | |
269 | fls_strings[(command >> 2) & 0x3], | |
270 | (command & CMD_RESET) ? " Reset" : "", | |
271 | (command & CMD_RUN) ? "RUN" : "HALT" | |
272 | ); | |
273 | } | |
274 | ||
275 | static int | |
276 | dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status) | |
277 | { | |
278 | char *sig; | |
279 | ||
280 | /* signaling state */ | |
281 | switch (status & (3 << 10)) { | |
282 | case 0 << 10: | |
283 | sig = "se0"; | |
284 | break; | |
285 | case 1 << 10: | |
286 | sig = "k"; | |
287 | break; /* low speed */ | |
288 | case 2 << 10: | |
289 | sig = "j"; | |
290 | break; | |
291 | default: | |
292 | sig = "?"; | |
293 | break; | |
294 | } | |
295 | ||
296 | return scnprintf(buf, len, | |
297 | "%s%sport:%d status %06x %d " | |
298 | "sig=%s%s%s%s%s%s%s%s", | |
299 | label, label[0] ? " " : "", port, status, | |
300 | status>>25,/*device address */ | |
301 | sig, | |
302 | (status & PORT_RESET) ? " RESET" : "", | |
303 | (status & PORT_SUSPEND) ? " SUSPEND" : "", | |
304 | (status & PORT_RESUME) ? " RESUME" : "", | |
305 | (status & PORT_PEC) ? " PEC" : "", | |
306 | (status & PORT_PE) ? " PE" : "", | |
307 | (status & PORT_CSC) ? " CSC" : "", | |
308 | (status & PORT_CONNECT) ? " CONNECT" : ""); | |
309 | } | |
310 | ||
311 | #else | |
312 | static inline void __maybe_unused | |
313 | dbg_qh(char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
314 | {} | |
315 | ||
316 | static inline int __maybe_unused | |
317 | dbg_status_buf(char *buf, unsigned len, const char *label, u32 status) | |
318 | { return 0; } | |
319 | ||
320 | static inline int __maybe_unused | |
321 | dbg_command_buf(char *buf, unsigned len, const char *label, u32 command) | |
322 | { return 0; } | |
323 | ||
324 | static inline int __maybe_unused | |
325 | dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable) | |
326 | { return 0; } | |
327 | ||
328 | static inline int __maybe_unused | |
329 | dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status) | |
330 | { return 0; } | |
331 | ||
332 | #endif /* DEBUG */ | |
333 | ||
334 | /* functions have the "wrong" filename when they're output... */ | |
335 | #define dbg_status(fotg210, label, status) { \ | |
336 | char _buf[80]; \ | |
337 | dbg_status_buf(_buf, sizeof(_buf), label, status); \ | |
338 | fotg210_dbg(fotg210, "%s\n", _buf); \ | |
339 | } | |
340 | ||
341 | #define dbg_cmd(fotg210, label, command) { \ | |
342 | char _buf[80]; \ | |
343 | dbg_command_buf(_buf, sizeof(_buf), label, command); \ | |
344 | fotg210_dbg(fotg210, "%s\n", _buf); \ | |
345 | } | |
346 | ||
347 | #define dbg_port(fotg210, label, port, status) { \ | |
348 | char _buf[80]; \ | |
349 | dbg_port_buf(_buf, sizeof(_buf), label, port, status); \ | |
350 | fotg210_dbg(fotg210, "%s\n", _buf); \ | |
351 | } | |
352 | ||
353 | /*-------------------------------------------------------------------------*/ | |
354 | ||
355 | #ifdef STUB_DEBUG_FILES | |
356 | ||
357 | static inline void create_debug_files(struct fotg210_hcd *bus) { } | |
358 | static inline void remove_debug_files(struct fotg210_hcd *bus) { } | |
359 | ||
360 | #else | |
361 | ||
362 | /* troubleshooting help: expose state in debugfs */ | |
363 | ||
364 | static int debug_async_open(struct inode *, struct file *); | |
365 | static int debug_periodic_open(struct inode *, struct file *); | |
366 | static int debug_registers_open(struct inode *, struct file *); | |
367 | static int debug_async_open(struct inode *, struct file *); | |
368 | ||
369 | static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*); | |
370 | static int debug_close(struct inode *, struct file *); | |
371 | ||
372 | static const struct file_operations debug_async_fops = { | |
373 | .owner = THIS_MODULE, | |
374 | .open = debug_async_open, | |
375 | .read = debug_output, | |
376 | .release = debug_close, | |
377 | .llseek = default_llseek, | |
378 | }; | |
379 | static const struct file_operations debug_periodic_fops = { | |
380 | .owner = THIS_MODULE, | |
381 | .open = debug_periodic_open, | |
382 | .read = debug_output, | |
383 | .release = debug_close, | |
384 | .llseek = default_llseek, | |
385 | }; | |
386 | static const struct file_operations debug_registers_fops = { | |
387 | .owner = THIS_MODULE, | |
388 | .open = debug_registers_open, | |
389 | .read = debug_output, | |
390 | .release = debug_close, | |
391 | .llseek = default_llseek, | |
392 | }; | |
393 | ||
394 | static struct dentry *fotg210_debug_root; | |
395 | ||
396 | struct debug_buffer { | |
397 | ssize_t (*fill_func)(struct debug_buffer *); /* fill method */ | |
398 | struct usb_bus *bus; | |
399 | struct mutex mutex; /* protect filling of buffer */ | |
400 | size_t count; /* number of characters filled into buffer */ | |
401 | char *output_buf; | |
402 | size_t alloc_size; | |
403 | }; | |
404 | ||
405 | #define speed_char(info1)({ char tmp; \ | |
406 | switch (info1 & (3 << 12)) { \ | |
407 | case QH_FULL_SPEED: \ | |
408 | tmp = 'f'; break; \ | |
409 | case QH_LOW_SPEED: \ | |
410 | tmp = 'l'; break; \ | |
411 | case QH_HIGH_SPEED: \ | |
412 | tmp = 'h'; break; \ | |
413 | default: \ | |
414 | tmp = '?'; break; \ | |
2b84f92b | 415 | } tmp; }) |
7d50195f FHC |
416 | |
417 | static inline char token_mark(struct fotg210_hcd *fotg210, __hc32 token) | |
418 | { | |
419 | __u32 v = hc32_to_cpu(fotg210, token); | |
420 | ||
421 | if (v & QTD_STS_ACTIVE) | |
422 | return '*'; | |
423 | if (v & QTD_STS_HALT) | |
424 | return '-'; | |
425 | if (!IS_SHORT_READ(v)) | |
426 | return ' '; | |
427 | /* tries to advance through hw_alt_next */ | |
428 | return '/'; | |
429 | } | |
430 | ||
431 | static void qh_lines( | |
432 | struct fotg210_hcd *fotg210, | |
433 | struct fotg210_qh *qh, | |
434 | char **nextp, | |
435 | unsigned *sizep | |
436 | ) | |
437 | { | |
438 | u32 scratch; | |
439 | u32 hw_curr; | |
440 | struct fotg210_qtd *td; | |
441 | unsigned temp; | |
442 | unsigned size = *sizep; | |
443 | char *next = *nextp; | |
444 | char mark; | |
445 | __le32 list_end = FOTG210_LIST_END(fotg210); | |
446 | struct fotg210_qh_hw *hw = qh->hw; | |
447 | ||
448 | if (hw->hw_qtd_next == list_end) /* NEC does this */ | |
449 | mark = '@'; | |
450 | else | |
451 | mark = token_mark(fotg210, hw->hw_token); | |
452 | if (mark == '/') { /* qh_alt_next controls qh advance? */ | |
453 | if ((hw->hw_alt_next & QTD_MASK(fotg210)) | |
454 | == fotg210->async->hw->hw_alt_next) | |
455 | mark = '#'; /* blocked */ | |
456 | else if (hw->hw_alt_next == list_end) | |
457 | mark = '.'; /* use hw_qtd_next */ | |
458 | /* else alt_next points to some other qtd */ | |
459 | } | |
460 | scratch = hc32_to_cpup(fotg210, &hw->hw_info1); | |
461 | hw_curr = (mark == '*') ? hc32_to_cpup(fotg210, &hw->hw_current) : 0; | |
462 | temp = scnprintf(next, size, | |
463 | "qh/%p dev%d %cs ep%d %08x %08x(%08x%c %s nak%d)", | |
464 | qh, scratch & 0x007f, | |
465 | speed_char(scratch), | |
466 | (scratch >> 8) & 0x000f, | |
467 | scratch, hc32_to_cpup(fotg210, &hw->hw_info2), | |
468 | hc32_to_cpup(fotg210, &hw->hw_token), mark, | |
469 | (cpu_to_hc32(fotg210, QTD_TOGGLE) & hw->hw_token) | |
470 | ? "data1" : "data0", | |
471 | (hc32_to_cpup(fotg210, &hw->hw_alt_next) >> 1) & 0x0f); | |
472 | size -= temp; | |
473 | next += temp; | |
474 | ||
475 | /* hc may be modifying the list as we read it ... */ | |
476 | list_for_each_entry(td, &qh->qtd_list, qtd_list) { | |
477 | scratch = hc32_to_cpup(fotg210, &td->hw_token); | |
478 | mark = ' '; | |
479 | if (hw_curr == td->qtd_dma) | |
480 | mark = '*'; | |
481 | else if (hw->hw_qtd_next == cpu_to_hc32(fotg210, td->qtd_dma)) | |
482 | mark = '+'; | |
483 | else if (QTD_LENGTH(scratch)) { | |
484 | if (td->hw_alt_next == fotg210->async->hw->hw_alt_next) | |
485 | mark = '#'; | |
486 | else if (td->hw_alt_next != list_end) | |
487 | mark = '/'; | |
488 | } | |
489 | temp = snprintf(next, size, | |
490 | "\n\t%p%c%s len=%d %08x urb %p", | |
491 | td, mark, ({ char *tmp; | |
492 | switch ((scratch>>8)&0x03) { | |
493 | case 0: | |
494 | tmp = "out"; | |
495 | break; | |
496 | case 1: | |
497 | tmp = "in"; | |
498 | break; | |
499 | case 2: | |
500 | tmp = "setup"; | |
501 | break; | |
502 | default: | |
503 | tmp = "?"; | |
504 | break; | |
505 | } tmp; }), | |
506 | (scratch >> 16) & 0x7fff, | |
507 | scratch, | |
508 | td->urb); | |
509 | if (size < temp) | |
510 | temp = size; | |
511 | size -= temp; | |
512 | next += temp; | |
513 | if (temp == size) | |
514 | goto done; | |
515 | } | |
516 | ||
517 | temp = snprintf(next, size, "\n"); | |
518 | if (size < temp) | |
519 | temp = size; | |
520 | size -= temp; | |
521 | next += temp; | |
522 | ||
523 | done: | |
524 | *sizep = size; | |
525 | *nextp = next; | |
526 | } | |
527 | ||
528 | static ssize_t fill_async_buffer(struct debug_buffer *buf) | |
529 | { | |
530 | struct usb_hcd *hcd; | |
531 | struct fotg210_hcd *fotg210; | |
532 | unsigned long flags; | |
533 | unsigned temp, size; | |
534 | char *next; | |
535 | struct fotg210_qh *qh; | |
536 | ||
537 | hcd = bus_to_hcd(buf->bus); | |
538 | fotg210 = hcd_to_fotg210(hcd); | |
539 | next = buf->output_buf; | |
540 | size = buf->alloc_size; | |
541 | ||
542 | *next = 0; | |
543 | ||
544 | /* dumps a snapshot of the async schedule. | |
545 | * usually empty except for long-term bulk reads, or head. | |
546 | * one QH per line, and TDs we know about | |
547 | */ | |
548 | spin_lock_irqsave(&fotg210->lock, flags); | |
549 | for (qh = fotg210->async->qh_next.qh; size > 0 && qh; | |
550 | qh = qh->qh_next.qh) | |
551 | qh_lines(fotg210, qh, &next, &size); | |
552 | if (fotg210->async_unlink && size > 0) { | |
553 | temp = scnprintf(next, size, "\nunlink =\n"); | |
554 | size -= temp; | |
555 | next += temp; | |
556 | ||
557 | for (qh = fotg210->async_unlink; size > 0 && qh; | |
558 | qh = qh->unlink_next) | |
559 | qh_lines(fotg210, qh, &next, &size); | |
560 | } | |
561 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
562 | ||
563 | return strlen(buf->output_buf); | |
564 | } | |
565 | ||
566 | #define DBG_SCHED_LIMIT 64 | |
567 | static ssize_t fill_periodic_buffer(struct debug_buffer *buf) | |
568 | { | |
569 | struct usb_hcd *hcd; | |
570 | struct fotg210_hcd *fotg210; | |
571 | unsigned long flags; | |
572 | union fotg210_shadow p, *seen; | |
573 | unsigned temp, size, seen_count; | |
574 | char *next; | |
575 | unsigned i; | |
576 | __hc32 tag; | |
577 | ||
578 | seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC); | |
579 | if (!seen) | |
580 | return 0; | |
581 | seen_count = 0; | |
582 | ||
583 | hcd = bus_to_hcd(buf->bus); | |
584 | fotg210 = hcd_to_fotg210(hcd); | |
585 | next = buf->output_buf; | |
586 | size = buf->alloc_size; | |
587 | ||
588 | temp = scnprintf(next, size, "size = %d\n", fotg210->periodic_size); | |
589 | size -= temp; | |
590 | next += temp; | |
591 | ||
592 | /* dump a snapshot of the periodic schedule. | |
593 | * iso changes, interrupt usually doesn't. | |
594 | */ | |
595 | spin_lock_irqsave(&fotg210->lock, flags); | |
596 | for (i = 0; i < fotg210->periodic_size; i++) { | |
597 | p = fotg210->pshadow[i]; | |
598 | if (likely(!p.ptr)) | |
599 | continue; | |
600 | tag = Q_NEXT_TYPE(fotg210, fotg210->periodic[i]); | |
601 | ||
602 | temp = scnprintf(next, size, "%4d: ", i); | |
603 | size -= temp; | |
604 | next += temp; | |
605 | ||
606 | do { | |
607 | struct fotg210_qh_hw *hw; | |
608 | ||
609 | switch (hc32_to_cpu(fotg210, tag)) { | |
610 | case Q_TYPE_QH: | |
611 | hw = p.qh->hw; | |
612 | temp = scnprintf(next, size, " qh%d-%04x/%p", | |
613 | p.qh->period, | |
614 | hc32_to_cpup(fotg210, | |
615 | &hw->hw_info2) | |
616 | /* uframe masks */ | |
617 | & (QH_CMASK | QH_SMASK), | |
618 | p.qh); | |
619 | size -= temp; | |
620 | next += temp; | |
621 | /* don't repeat what follows this qh */ | |
622 | for (temp = 0; temp < seen_count; temp++) { | |
623 | if (seen[temp].ptr != p.ptr) | |
624 | continue; | |
625 | if (p.qh->qh_next.ptr) { | |
626 | temp = scnprintf(next, size, | |
627 | " ..."); | |
628 | size -= temp; | |
629 | next += temp; | |
630 | } | |
631 | break; | |
632 | } | |
633 | /* show more info the first time around */ | |
634 | if (temp == seen_count) { | |
635 | u32 scratch = hc32_to_cpup(fotg210, | |
636 | &hw->hw_info1); | |
637 | struct fotg210_qtd *qtd; | |
638 | char *type = ""; | |
639 | ||
640 | /* count tds, get ep direction */ | |
641 | temp = 0; | |
642 | list_for_each_entry(qtd, | |
643 | &p.qh->qtd_list, | |
644 | qtd_list) { | |
645 | temp++; | |
646 | switch (0x03 & (hc32_to_cpu( | |
647 | fotg210, | |
648 | qtd->hw_token) >> 8)) { | |
649 | case 0: | |
650 | type = "out"; | |
651 | continue; | |
652 | case 1: | |
653 | type = "in"; | |
654 | continue; | |
655 | } | |
656 | } | |
657 | ||
658 | temp = scnprintf(next, size, | |
659 | "(%c%d ep%d%s " | |
660 | "[%d/%d] q%d p%d)", | |
661 | speed_char(scratch), | |
662 | scratch & 0x007f, | |
663 | (scratch >> 8) & 0x000f, type, | |
664 | p.qh->usecs, p.qh->c_usecs, | |
665 | temp, | |
666 | 0x7ff & (scratch >> 16)); | |
667 | ||
668 | if (seen_count < DBG_SCHED_LIMIT) | |
669 | seen[seen_count++].qh = p.qh; | |
670 | } else | |
671 | temp = 0; | |
672 | tag = Q_NEXT_TYPE(fotg210, hw->hw_next); | |
673 | p = p.qh->qh_next; | |
674 | break; | |
675 | case Q_TYPE_FSTN: | |
676 | temp = scnprintf(next, size, | |
677 | " fstn-%8x/%p", p.fstn->hw_prev, | |
678 | p.fstn); | |
679 | tag = Q_NEXT_TYPE(fotg210, p.fstn->hw_next); | |
680 | p = p.fstn->fstn_next; | |
681 | break; | |
682 | case Q_TYPE_ITD: | |
683 | temp = scnprintf(next, size, | |
684 | " itd/%p", p.itd); | |
685 | tag = Q_NEXT_TYPE(fotg210, p.itd->hw_next); | |
686 | p = p.itd->itd_next; | |
687 | break; | |
688 | } | |
689 | size -= temp; | |
690 | next += temp; | |
691 | } while (p.ptr); | |
692 | ||
693 | temp = scnprintf(next, size, "\n"); | |
694 | size -= temp; | |
695 | next += temp; | |
696 | } | |
697 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
698 | kfree(seen); | |
699 | ||
700 | return buf->alloc_size - size; | |
701 | } | |
702 | #undef DBG_SCHED_LIMIT | |
703 | ||
704 | static const char *rh_state_string(struct fotg210_hcd *fotg210) | |
705 | { | |
706 | switch (fotg210->rh_state) { | |
707 | case FOTG210_RH_HALTED: | |
708 | return "halted"; | |
709 | case FOTG210_RH_SUSPENDED: | |
710 | return "suspended"; | |
711 | case FOTG210_RH_RUNNING: | |
712 | return "running"; | |
713 | case FOTG210_RH_STOPPING: | |
714 | return "stopping"; | |
715 | } | |
716 | return "?"; | |
717 | } | |
718 | ||
719 | static ssize_t fill_registers_buffer(struct debug_buffer *buf) | |
720 | { | |
721 | struct usb_hcd *hcd; | |
722 | struct fotg210_hcd *fotg210; | |
723 | unsigned long flags; | |
724 | unsigned temp, size, i; | |
725 | char *next, scratch[80]; | |
726 | static const char fmt[] = "%*s\n"; | |
727 | static const char label[] = ""; | |
728 | ||
729 | hcd = bus_to_hcd(buf->bus); | |
730 | fotg210 = hcd_to_fotg210(hcd); | |
731 | next = buf->output_buf; | |
732 | size = buf->alloc_size; | |
733 | ||
734 | spin_lock_irqsave(&fotg210->lock, flags); | |
735 | ||
736 | if (!HCD_HW_ACCESSIBLE(hcd)) { | |
737 | size = scnprintf(next, size, | |
738 | "bus %s, device %s\n" | |
739 | "%s\n" | |
740 | "SUSPENDED(no register access)\n", | |
741 | hcd->self.controller->bus->name, | |
742 | dev_name(hcd->self.controller), | |
743 | hcd->product_desc); | |
744 | goto done; | |
745 | } | |
746 | ||
747 | /* Capability Registers */ | |
748 | i = HC_VERSION(fotg210, fotg210_readl(fotg210, | |
749 | &fotg210->caps->hc_capbase)); | |
750 | temp = scnprintf(next, size, | |
751 | "bus %s, device %s\n" | |
752 | "%s\n" | |
753 | "EHCI %x.%02x, rh state %s\n", | |
754 | hcd->self.controller->bus->name, | |
755 | dev_name(hcd->self.controller), | |
756 | hcd->product_desc, | |
757 | i >> 8, i & 0x0ff, rh_state_string(fotg210)); | |
758 | size -= temp; | |
759 | next += temp; | |
760 | ||
761 | /* FIXME interpret both types of params */ | |
762 | i = fotg210_readl(fotg210, &fotg210->caps->hcs_params); | |
763 | temp = scnprintf(next, size, "structural params 0x%08x\n", i); | |
764 | size -= temp; | |
765 | next += temp; | |
766 | ||
767 | i = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
768 | temp = scnprintf(next, size, "capability params 0x%08x\n", i); | |
769 | size -= temp; | |
770 | next += temp; | |
771 | ||
772 | /* Operational Registers */ | |
773 | temp = dbg_status_buf(scratch, sizeof(scratch), label, | |
774 | fotg210_readl(fotg210, &fotg210->regs->status)); | |
775 | temp = scnprintf(next, size, fmt, temp, scratch); | |
776 | size -= temp; | |
777 | next += temp; | |
778 | ||
779 | temp = dbg_command_buf(scratch, sizeof(scratch), label, | |
780 | fotg210_readl(fotg210, &fotg210->regs->command)); | |
781 | temp = scnprintf(next, size, fmt, temp, scratch); | |
782 | size -= temp; | |
783 | next += temp; | |
784 | ||
785 | temp = dbg_intr_buf(scratch, sizeof(scratch), label, | |
786 | fotg210_readl(fotg210, &fotg210->regs->intr_enable)); | |
787 | temp = scnprintf(next, size, fmt, temp, scratch); | |
788 | size -= temp; | |
789 | next += temp; | |
790 | ||
791 | temp = scnprintf(next, size, "uframe %04x\n", | |
792 | fotg210_read_frame_index(fotg210)); | |
793 | size -= temp; | |
794 | next += temp; | |
795 | ||
796 | if (fotg210->async_unlink) { | |
797 | temp = scnprintf(next, size, "async unlink qh %p\n", | |
798 | fotg210->async_unlink); | |
799 | size -= temp; | |
800 | next += temp; | |
801 | } | |
802 | ||
803 | #ifdef FOTG210_STATS | |
804 | temp = scnprintf(next, size, | |
805 | "irq normal %ld err %ld iaa %ld(lost %ld)\n", | |
806 | fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa, | |
807 | fotg210->stats.lost_iaa); | |
808 | size -= temp; | |
809 | next += temp; | |
810 | ||
811 | temp = scnprintf(next, size, "complete %ld unlink %ld\n", | |
812 | fotg210->stats.complete, fotg210->stats.unlink); | |
813 | size -= temp; | |
814 | next += temp; | |
815 | #endif | |
816 | ||
817 | done: | |
818 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
819 | ||
820 | return buf->alloc_size - size; | |
821 | } | |
822 | ||
823 | static struct debug_buffer *alloc_buffer(struct usb_bus *bus, | |
824 | ssize_t (*fill_func)(struct debug_buffer *)) | |
825 | { | |
826 | struct debug_buffer *buf; | |
827 | ||
828 | buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL); | |
829 | ||
830 | if (buf) { | |
831 | buf->bus = bus; | |
832 | buf->fill_func = fill_func; | |
833 | mutex_init(&buf->mutex); | |
834 | buf->alloc_size = PAGE_SIZE; | |
835 | } | |
836 | ||
837 | return buf; | |
838 | } | |
839 | ||
840 | static int fill_buffer(struct debug_buffer *buf) | |
841 | { | |
842 | int ret = 0; | |
843 | ||
844 | if (!buf->output_buf) | |
845 | buf->output_buf = vmalloc(buf->alloc_size); | |
846 | ||
847 | if (!buf->output_buf) { | |
848 | ret = -ENOMEM; | |
849 | goto out; | |
850 | } | |
851 | ||
852 | ret = buf->fill_func(buf); | |
853 | ||
854 | if (ret >= 0) { | |
855 | buf->count = ret; | |
856 | ret = 0; | |
857 | } | |
858 | ||
859 | out: | |
860 | return ret; | |
861 | } | |
862 | ||
863 | static ssize_t debug_output(struct file *file, char __user *user_buf, | |
864 | size_t len, loff_t *offset) | |
865 | { | |
866 | struct debug_buffer *buf = file->private_data; | |
867 | int ret = 0; | |
868 | ||
869 | mutex_lock(&buf->mutex); | |
870 | if (buf->count == 0) { | |
871 | ret = fill_buffer(buf); | |
872 | if (ret != 0) { | |
873 | mutex_unlock(&buf->mutex); | |
874 | goto out; | |
875 | } | |
876 | } | |
877 | mutex_unlock(&buf->mutex); | |
878 | ||
879 | ret = simple_read_from_buffer(user_buf, len, offset, | |
880 | buf->output_buf, buf->count); | |
881 | ||
882 | out: | |
883 | return ret; | |
884 | ||
885 | } | |
886 | ||
887 | static int debug_close(struct inode *inode, struct file *file) | |
888 | { | |
889 | struct debug_buffer *buf = file->private_data; | |
890 | ||
891 | if (buf) { | |
892 | vfree(buf->output_buf); | |
893 | kfree(buf); | |
894 | } | |
895 | ||
896 | return 0; | |
897 | } | |
898 | static int debug_async_open(struct inode *inode, struct file *file) | |
899 | { | |
900 | file->private_data = alloc_buffer(inode->i_private, fill_async_buffer); | |
901 | ||
902 | return file->private_data ? 0 : -ENOMEM; | |
903 | } | |
904 | ||
905 | static int debug_periodic_open(struct inode *inode, struct file *file) | |
906 | { | |
907 | struct debug_buffer *buf; | |
908 | buf = alloc_buffer(inode->i_private, fill_periodic_buffer); | |
909 | if (!buf) | |
910 | return -ENOMEM; | |
911 | ||
912 | buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE; | |
913 | file->private_data = buf; | |
914 | return 0; | |
915 | } | |
916 | ||
917 | static int debug_registers_open(struct inode *inode, struct file *file) | |
918 | { | |
919 | file->private_data = alloc_buffer(inode->i_private, | |
920 | fill_registers_buffer); | |
921 | ||
922 | return file->private_data ? 0 : -ENOMEM; | |
923 | } | |
924 | ||
925 | static inline void create_debug_files(struct fotg210_hcd *fotg210) | |
926 | { | |
927 | struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self; | |
928 | ||
929 | fotg210->debug_dir = debugfs_create_dir(bus->bus_name, | |
930 | fotg210_debug_root); | |
931 | if (!fotg210->debug_dir) | |
932 | return; | |
933 | ||
934 | if (!debugfs_create_file("async", S_IRUGO, fotg210->debug_dir, bus, | |
935 | &debug_async_fops)) | |
936 | goto file_error; | |
937 | ||
938 | if (!debugfs_create_file("periodic", S_IRUGO, fotg210->debug_dir, bus, | |
939 | &debug_periodic_fops)) | |
940 | goto file_error; | |
941 | ||
942 | if (!debugfs_create_file("registers", S_IRUGO, fotg210->debug_dir, bus, | |
943 | &debug_registers_fops)) | |
944 | goto file_error; | |
945 | ||
946 | return; | |
947 | ||
948 | file_error: | |
949 | debugfs_remove_recursive(fotg210->debug_dir); | |
950 | } | |
951 | ||
952 | static inline void remove_debug_files(struct fotg210_hcd *fotg210) | |
953 | { | |
954 | debugfs_remove_recursive(fotg210->debug_dir); | |
955 | } | |
956 | ||
957 | #endif /* STUB_DEBUG_FILES */ | |
958 | /*-------------------------------------------------------------------------*/ | |
959 | ||
960 | /* | |
961 | * handshake - spin reading hc until handshake completes or fails | |
962 | * @ptr: address of hc register to be read | |
963 | * @mask: bits to look at in result of read | |
964 | * @done: value of those bits when handshake succeeds | |
965 | * @usec: timeout in microseconds | |
966 | * | |
967 | * Returns negative errno, or zero on success | |
968 | * | |
969 | * Success happens when the "mask" bits have the specified value (hardware | |
970 | * handshake done). There are two failure modes: "usec" have passed (major | |
971 | * hardware flakeout), or the register reads as all-ones (hardware removed). | |
972 | * | |
973 | * That last failure should_only happen in cases like physical cardbus eject | |
974 | * before driver shutdown. But it also seems to be caused by bugs in cardbus | |
975 | * bridge shutdown: shutting down the bridge before the devices using it. | |
976 | */ | |
977 | static int handshake(struct fotg210_hcd *fotg210, void __iomem *ptr, | |
978 | u32 mask, u32 done, int usec) | |
979 | { | |
980 | u32 result; | |
981 | ||
982 | do { | |
983 | result = fotg210_readl(fotg210, ptr); | |
984 | if (result == ~(u32)0) /* card removed */ | |
985 | return -ENODEV; | |
986 | result &= mask; | |
987 | if (result == done) | |
988 | return 0; | |
989 | udelay(1); | |
990 | usec--; | |
991 | } while (usec > 0); | |
992 | return -ETIMEDOUT; | |
993 | } | |
994 | ||
995 | /* | |
996 | * Force HC to halt state from unknown (EHCI spec section 2.3). | |
997 | * Must be called with interrupts enabled and the lock not held. | |
998 | */ | |
999 | static int fotg210_halt(struct fotg210_hcd *fotg210) | |
1000 | { | |
1001 | u32 temp; | |
1002 | ||
1003 | spin_lock_irq(&fotg210->lock); | |
1004 | ||
1005 | /* disable any irqs left enabled by previous code */ | |
1006 | fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); | |
1007 | ||
1008 | /* | |
1009 | * This routine gets called during probe before fotg210->command | |
1010 | * has been initialized, so we can't rely on its value. | |
1011 | */ | |
1012 | fotg210->command &= ~CMD_RUN; | |
1013 | temp = fotg210_readl(fotg210, &fotg210->regs->command); | |
1014 | temp &= ~(CMD_RUN | CMD_IAAD); | |
1015 | fotg210_writel(fotg210, temp, &fotg210->regs->command); | |
1016 | ||
1017 | spin_unlock_irq(&fotg210->lock); | |
1018 | synchronize_irq(fotg210_to_hcd(fotg210)->irq); | |
1019 | ||
1020 | return handshake(fotg210, &fotg210->regs->status, | |
1021 | STS_HALT, STS_HALT, 16 * 125); | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Reset a non-running (STS_HALT == 1) controller. | |
1026 | * Must be called with interrupts enabled and the lock not held. | |
1027 | */ | |
1028 | static int fotg210_reset(struct fotg210_hcd *fotg210) | |
1029 | { | |
1030 | int retval; | |
1031 | u32 command = fotg210_readl(fotg210, &fotg210->regs->command); | |
1032 | ||
1033 | /* If the EHCI debug controller is active, special care must be | |
1034 | * taken before and after a host controller reset */ | |
1035 | if (fotg210->debug && !dbgp_reset_prep(fotg210_to_hcd(fotg210))) | |
1036 | fotg210->debug = NULL; | |
1037 | ||
1038 | command |= CMD_RESET; | |
1039 | dbg_cmd(fotg210, "reset", command); | |
1040 | fotg210_writel(fotg210, command, &fotg210->regs->command); | |
1041 | fotg210->rh_state = FOTG210_RH_HALTED; | |
1042 | fotg210->next_statechange = jiffies; | |
1043 | retval = handshake(fotg210, &fotg210->regs->command, | |
1044 | CMD_RESET, 0, 250 * 1000); | |
1045 | ||
1046 | if (retval) | |
1047 | return retval; | |
1048 | ||
1049 | if (fotg210->debug) | |
1050 | dbgp_external_startup(fotg210_to_hcd(fotg210)); | |
1051 | ||
1052 | fotg210->port_c_suspend = fotg210->suspended_ports = | |
1053 | fotg210->resuming_ports = 0; | |
1054 | return retval; | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Idle the controller (turn off the schedules). | |
1059 | * Must be called with interrupts enabled and the lock not held. | |
1060 | */ | |
1061 | static void fotg210_quiesce(struct fotg210_hcd *fotg210) | |
1062 | { | |
1063 | u32 temp; | |
1064 | ||
1065 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1066 | return; | |
1067 | ||
1068 | /* wait for any schedule enables/disables to take effect */ | |
1069 | temp = (fotg210->command << 10) & (STS_ASS | STS_PSS); | |
1070 | handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, temp, | |
1071 | 16 * 125); | |
1072 | ||
1073 | /* then disable anything that's still active */ | |
1074 | spin_lock_irq(&fotg210->lock); | |
1075 | fotg210->command &= ~(CMD_ASE | CMD_PSE); | |
1076 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
1077 | spin_unlock_irq(&fotg210->lock); | |
1078 | ||
1079 | /* hardware can take 16 microframes to turn off ... */ | |
1080 | handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, 0, | |
1081 | 16 * 125); | |
1082 | } | |
1083 | ||
1084 | /*-------------------------------------------------------------------------*/ | |
1085 | ||
1086 | static void end_unlink_async(struct fotg210_hcd *fotg210); | |
1087 | static void unlink_empty_async(struct fotg210_hcd *fotg210); | |
1088 | static void fotg210_work(struct fotg210_hcd *fotg210); | |
1089 | static void start_unlink_intr(struct fotg210_hcd *fotg210, | |
1090 | struct fotg210_qh *qh); | |
1091 | static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); | |
1092 | ||
1093 | /*-------------------------------------------------------------------------*/ | |
1094 | ||
1095 | /* Set a bit in the USBCMD register */ | |
1096 | static void fotg210_set_command_bit(struct fotg210_hcd *fotg210, u32 bit) | |
1097 | { | |
1098 | fotg210->command |= bit; | |
1099 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
1100 | ||
1101 | /* unblock posted write */ | |
1102 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1103 | } | |
1104 | ||
1105 | /* Clear a bit in the USBCMD register */ | |
1106 | static void fotg210_clear_command_bit(struct fotg210_hcd *fotg210, u32 bit) | |
1107 | { | |
1108 | fotg210->command &= ~bit; | |
1109 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
1110 | ||
1111 | /* unblock posted write */ | |
1112 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1113 | } | |
1114 | ||
1115 | /*-------------------------------------------------------------------------*/ | |
1116 | ||
1117 | /* | |
1118 | * EHCI timer support... Now using hrtimers. | |
1119 | * | |
1120 | * Lots of different events are triggered from fotg210->hrtimer. Whenever | |
1121 | * the timer routine runs, it checks each possible event; events that are | |
1122 | * currently enabled and whose expiration time has passed get handled. | |
1123 | * The set of enabled events is stored as a collection of bitflags in | |
1124 | * fotg210->enabled_hrtimer_events, and they are numbered in order of | |
1125 | * increasing delay values (ranging between 1 ms and 100 ms). | |
1126 | * | |
1127 | * Rather than implementing a sorted list or tree of all pending events, | |
1128 | * we keep track only of the lowest-numbered pending event, in | |
1129 | * fotg210->next_hrtimer_event. Whenever fotg210->hrtimer gets restarted, its | |
1130 | * expiration time is set to the timeout value for this event. | |
1131 | * | |
1132 | * As a result, events might not get handled right away; the actual delay | |
1133 | * could be anywhere up to twice the requested delay. This doesn't | |
1134 | * matter, because none of the events are especially time-critical. The | |
1135 | * ones that matter most all have a delay of 1 ms, so they will be | |
1136 | * handled after 2 ms at most, which is okay. In addition to this, we | |
1137 | * allow for an expiration range of 1 ms. | |
1138 | */ | |
1139 | ||
1140 | /* | |
1141 | * Delay lengths for the hrtimer event types. | |
1142 | * Keep this list sorted by delay length, in the same order as | |
1143 | * the event types indexed by enum fotg210_hrtimer_event in fotg210.h. | |
1144 | */ | |
1145 | static unsigned event_delays_ns[] = { | |
1146 | 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_ASS */ | |
1147 | 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_PSS */ | |
1148 | 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_DEAD */ | |
1149 | 1125 * NSEC_PER_USEC, /* FOTG210_HRTIMER_UNLINK_INTR */ | |
1150 | 2 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_FREE_ITDS */ | |
1151 | 6 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_ASYNC_UNLINKS */ | |
1152 | 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IAA_WATCHDOG */ | |
1153 | 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_PERIODIC */ | |
1154 | 15 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_ASYNC */ | |
1155 | 100 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IO_WATCHDOG */ | |
1156 | }; | |
1157 | ||
1158 | /* Enable a pending hrtimer event */ | |
1159 | static void fotg210_enable_event(struct fotg210_hcd *fotg210, unsigned event, | |
1160 | bool resched) | |
1161 | { | |
1162 | ktime_t *timeout = &fotg210->hr_timeouts[event]; | |
1163 | ||
1164 | if (resched) | |
1165 | *timeout = ktime_add(ktime_get(), | |
1166 | ktime_set(0, event_delays_ns[event])); | |
1167 | fotg210->enabled_hrtimer_events |= (1 << event); | |
1168 | ||
1169 | /* Track only the lowest-numbered pending event */ | |
1170 | if (event < fotg210->next_hrtimer_event) { | |
1171 | fotg210->next_hrtimer_event = event; | |
1172 | hrtimer_start_range_ns(&fotg210->hrtimer, *timeout, | |
1173 | NSEC_PER_MSEC, HRTIMER_MODE_ABS); | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | ||
1178 | /* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */ | |
1179 | static void fotg210_poll_ASS(struct fotg210_hcd *fotg210) | |
1180 | { | |
1181 | unsigned actual, want; | |
1182 | ||
1183 | /* Don't enable anything if the controller isn't running (e.g., died) */ | |
1184 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1185 | return; | |
1186 | ||
1187 | want = (fotg210->command & CMD_ASE) ? STS_ASS : 0; | |
1188 | actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_ASS; | |
1189 | ||
1190 | if (want != actual) { | |
1191 | ||
1192 | /* Poll again later, but give up after about 20 ms */ | |
1193 | if (fotg210->ASS_poll_count++ < 20) { | |
1194 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_ASS, | |
1195 | true); | |
1196 | return; | |
1197 | } | |
1198 | fotg210_dbg(fotg210, "Waited too long for the async schedule status (%x/%x), giving up\n", | |
1199 | want, actual); | |
1200 | } | |
1201 | fotg210->ASS_poll_count = 0; | |
1202 | ||
1203 | /* The status is up-to-date; restart or stop the schedule as needed */ | |
1204 | if (want == 0) { /* Stopped */ | |
1205 | if (fotg210->async_count > 0) | |
1206 | fotg210_set_command_bit(fotg210, CMD_ASE); | |
1207 | ||
1208 | } else { /* Running */ | |
1209 | if (fotg210->async_count == 0) { | |
1210 | ||
1211 | /* Turn off the schedule after a while */ | |
1212 | fotg210_enable_event(fotg210, | |
1213 | FOTG210_HRTIMER_DISABLE_ASYNC, | |
1214 | true); | |
1215 | } | |
1216 | } | |
1217 | } | |
1218 | ||
1219 | /* Turn off the async schedule after a brief delay */ | |
1220 | static void fotg210_disable_ASE(struct fotg210_hcd *fotg210) | |
1221 | { | |
1222 | fotg210_clear_command_bit(fotg210, CMD_ASE); | |
1223 | } | |
1224 | ||
1225 | ||
1226 | /* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */ | |
1227 | static void fotg210_poll_PSS(struct fotg210_hcd *fotg210) | |
1228 | { | |
1229 | unsigned actual, want; | |
1230 | ||
1231 | /* Don't do anything if the controller isn't running (e.g., died) */ | |
1232 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1233 | return; | |
1234 | ||
1235 | want = (fotg210->command & CMD_PSE) ? STS_PSS : 0; | |
1236 | actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_PSS; | |
1237 | ||
1238 | if (want != actual) { | |
1239 | ||
1240 | /* Poll again later, but give up after about 20 ms */ | |
1241 | if (fotg210->PSS_poll_count++ < 20) { | |
1242 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_PSS, | |
1243 | true); | |
1244 | return; | |
1245 | } | |
1246 | fotg210_dbg(fotg210, "Waited too long for the periodic schedule status (%x/%x), giving up\n", | |
1247 | want, actual); | |
1248 | } | |
1249 | fotg210->PSS_poll_count = 0; | |
1250 | ||
1251 | /* The status is up-to-date; restart or stop the schedule as needed */ | |
1252 | if (want == 0) { /* Stopped */ | |
1253 | if (fotg210->periodic_count > 0) | |
1254 | fotg210_set_command_bit(fotg210, CMD_PSE); | |
1255 | ||
1256 | } else { /* Running */ | |
1257 | if (fotg210->periodic_count == 0) { | |
1258 | ||
1259 | /* Turn off the schedule after a while */ | |
1260 | fotg210_enable_event(fotg210, | |
1261 | FOTG210_HRTIMER_DISABLE_PERIODIC, | |
1262 | true); | |
1263 | } | |
1264 | } | |
1265 | } | |
1266 | ||
1267 | /* Turn off the periodic schedule after a brief delay */ | |
1268 | static void fotg210_disable_PSE(struct fotg210_hcd *fotg210) | |
1269 | { | |
1270 | fotg210_clear_command_bit(fotg210, CMD_PSE); | |
1271 | } | |
1272 | ||
1273 | ||
1274 | /* Poll the STS_HALT status bit; see when a dead controller stops */ | |
1275 | static void fotg210_handle_controller_death(struct fotg210_hcd *fotg210) | |
1276 | { | |
1277 | if (!(fotg210_readl(fotg210, &fotg210->regs->status) & STS_HALT)) { | |
1278 | ||
1279 | /* Give up after a few milliseconds */ | |
1280 | if (fotg210->died_poll_count++ < 5) { | |
1281 | /* Try again later */ | |
1282 | fotg210_enable_event(fotg210, | |
1283 | FOTG210_HRTIMER_POLL_DEAD, true); | |
1284 | return; | |
1285 | } | |
1286 | fotg210_warn(fotg210, "Waited too long for the controller to stop, giving up\n"); | |
1287 | } | |
1288 | ||
1289 | /* Clean up the mess */ | |
1290 | fotg210->rh_state = FOTG210_RH_HALTED; | |
1291 | fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); | |
1292 | fotg210_work(fotg210); | |
1293 | end_unlink_async(fotg210); | |
1294 | ||
1295 | /* Not in process context, so don't try to reset the controller */ | |
1296 | } | |
1297 | ||
1298 | ||
1299 | /* Handle unlinked interrupt QHs once they are gone from the hardware */ | |
1300 | static void fotg210_handle_intr_unlinks(struct fotg210_hcd *fotg210) | |
1301 | { | |
1302 | bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING); | |
1303 | ||
1304 | /* | |
1305 | * Process all the QHs on the intr_unlink list that were added | |
1306 | * before the current unlink cycle began. The list is in | |
1307 | * temporal order, so stop when we reach the first entry in the | |
1308 | * current cycle. But if the root hub isn't running then | |
1309 | * process all the QHs on the list. | |
1310 | */ | |
1311 | fotg210->intr_unlinking = true; | |
1312 | while (fotg210->intr_unlink) { | |
1313 | struct fotg210_qh *qh = fotg210->intr_unlink; | |
1314 | ||
1315 | if (!stopped && qh->unlink_cycle == fotg210->intr_unlink_cycle) | |
1316 | break; | |
1317 | fotg210->intr_unlink = qh->unlink_next; | |
1318 | qh->unlink_next = NULL; | |
1319 | end_unlink_intr(fotg210, qh); | |
1320 | } | |
1321 | ||
1322 | /* Handle remaining entries later */ | |
1323 | if (fotg210->intr_unlink) { | |
1324 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR, | |
1325 | true); | |
1326 | ++fotg210->intr_unlink_cycle; | |
1327 | } | |
1328 | fotg210->intr_unlinking = false; | |
1329 | } | |
1330 | ||
1331 | ||
1332 | /* Start another free-iTDs/siTDs cycle */ | |
1333 | static void start_free_itds(struct fotg210_hcd *fotg210) | |
1334 | { | |
1335 | if (!(fotg210->enabled_hrtimer_events & | |
1336 | BIT(FOTG210_HRTIMER_FREE_ITDS))) { | |
1337 | fotg210->last_itd_to_free = list_entry( | |
1338 | fotg210->cached_itd_list.prev, | |
1339 | struct fotg210_itd, itd_list); | |
1340 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_FREE_ITDS, true); | |
1341 | } | |
1342 | } | |
1343 | ||
1344 | /* Wait for controller to stop using old iTDs and siTDs */ | |
1345 | static void end_free_itds(struct fotg210_hcd *fotg210) | |
1346 | { | |
1347 | struct fotg210_itd *itd, *n; | |
1348 | ||
1349 | if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
1350 | fotg210->last_itd_to_free = NULL; | |
1351 | ||
1352 | list_for_each_entry_safe(itd, n, &fotg210->cached_itd_list, itd_list) { | |
1353 | list_del(&itd->itd_list); | |
1354 | dma_pool_free(fotg210->itd_pool, itd, itd->itd_dma); | |
1355 | if (itd == fotg210->last_itd_to_free) | |
1356 | break; | |
1357 | } | |
1358 | ||
1359 | if (!list_empty(&fotg210->cached_itd_list)) | |
1360 | start_free_itds(fotg210); | |
1361 | } | |
1362 | ||
1363 | ||
1364 | /* Handle lost (or very late) IAA interrupts */ | |
1365 | static void fotg210_iaa_watchdog(struct fotg210_hcd *fotg210) | |
1366 | { | |
1367 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1368 | return; | |
1369 | ||
1370 | /* | |
1371 | * Lost IAA irqs wedge things badly; seen first with a vt8235. | |
1372 | * So we need this watchdog, but must protect it against both | |
1373 | * (a) SMP races against real IAA firing and retriggering, and | |
1374 | * (b) clean HC shutdown, when IAA watchdog was pending. | |
1375 | */ | |
1376 | if (fotg210->async_iaa) { | |
1377 | u32 cmd, status; | |
1378 | ||
1379 | /* If we get here, IAA is *REALLY* late. It's barely | |
1380 | * conceivable that the system is so busy that CMD_IAAD | |
1381 | * is still legitimately set, so let's be sure it's | |
1382 | * clear before we read STS_IAA. (The HC should clear | |
1383 | * CMD_IAAD when it sets STS_IAA.) | |
1384 | */ | |
1385 | cmd = fotg210_readl(fotg210, &fotg210->regs->command); | |
1386 | ||
1387 | /* | |
1388 | * If IAA is set here it either legitimately triggered | |
1389 | * after the watchdog timer expired (_way_ late, so we'll | |
1390 | * still count it as lost) ... or a silicon erratum: | |
1391 | * - VIA seems to set IAA without triggering the IRQ; | |
1392 | * - IAAD potentially cleared without setting IAA. | |
1393 | */ | |
1394 | status = fotg210_readl(fotg210, &fotg210->regs->status); | |
1395 | if ((status & STS_IAA) || !(cmd & CMD_IAAD)) { | |
1396 | COUNT(fotg210->stats.lost_iaa); | |
1397 | fotg210_writel(fotg210, STS_IAA, | |
1398 | &fotg210->regs->status); | |
1399 | } | |
1400 | ||
1401 | fotg210_vdbg(fotg210, "IAA watchdog: status %x cmd %x\n", | |
1402 | status, cmd); | |
1403 | end_unlink_async(fotg210); | |
1404 | } | |
1405 | } | |
1406 | ||
1407 | ||
1408 | /* Enable the I/O watchdog, if appropriate */ | |
1409 | static void turn_on_io_watchdog(struct fotg210_hcd *fotg210) | |
1410 | { | |
1411 | /* Not needed if the controller isn't running or it's already enabled */ | |
1412 | if (fotg210->rh_state != FOTG210_RH_RUNNING || | |
1413 | (fotg210->enabled_hrtimer_events & | |
1414 | BIT(FOTG210_HRTIMER_IO_WATCHDOG))) | |
1415 | return; | |
1416 | ||
1417 | /* | |
1418 | * Isochronous transfers always need the watchdog. | |
1419 | * For other sorts we use it only if the flag is set. | |
1420 | */ | |
1421 | if (fotg210->isoc_count > 0 || (fotg210->need_io_watchdog && | |
1422 | fotg210->async_count + fotg210->intr_count > 0)) | |
1423 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_IO_WATCHDOG, | |
1424 | true); | |
1425 | } | |
1426 | ||
1427 | ||
1428 | /* | |
1429 | * Handler functions for the hrtimer event types. | |
1430 | * Keep this array in the same order as the event types indexed by | |
1431 | * enum fotg210_hrtimer_event in fotg210.h. | |
1432 | */ | |
1433 | static void (*event_handlers[])(struct fotg210_hcd *) = { | |
1434 | fotg210_poll_ASS, /* FOTG210_HRTIMER_POLL_ASS */ | |
1435 | fotg210_poll_PSS, /* FOTG210_HRTIMER_POLL_PSS */ | |
1436 | fotg210_handle_controller_death, /* FOTG210_HRTIMER_POLL_DEAD */ | |
1437 | fotg210_handle_intr_unlinks, /* FOTG210_HRTIMER_UNLINK_INTR */ | |
1438 | end_free_itds, /* FOTG210_HRTIMER_FREE_ITDS */ | |
1439 | unlink_empty_async, /* FOTG210_HRTIMER_ASYNC_UNLINKS */ | |
1440 | fotg210_iaa_watchdog, /* FOTG210_HRTIMER_IAA_WATCHDOG */ | |
1441 | fotg210_disable_PSE, /* FOTG210_HRTIMER_DISABLE_PERIODIC */ | |
1442 | fotg210_disable_ASE, /* FOTG210_HRTIMER_DISABLE_ASYNC */ | |
1443 | fotg210_work, /* FOTG210_HRTIMER_IO_WATCHDOG */ | |
1444 | }; | |
1445 | ||
1446 | static enum hrtimer_restart fotg210_hrtimer_func(struct hrtimer *t) | |
1447 | { | |
1448 | struct fotg210_hcd *fotg210 = | |
1449 | container_of(t, struct fotg210_hcd, hrtimer); | |
1450 | ktime_t now; | |
1451 | unsigned long events; | |
1452 | unsigned long flags; | |
1453 | unsigned e; | |
1454 | ||
1455 | spin_lock_irqsave(&fotg210->lock, flags); | |
1456 | ||
1457 | events = fotg210->enabled_hrtimer_events; | |
1458 | fotg210->enabled_hrtimer_events = 0; | |
1459 | fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT; | |
1460 | ||
1461 | /* | |
1462 | * Check each pending event. If its time has expired, handle | |
1463 | * the event; otherwise re-enable it. | |
1464 | */ | |
1465 | now = ktime_get(); | |
1466 | for_each_set_bit(e, &events, FOTG210_HRTIMER_NUM_EVENTS) { | |
1467 | if (now.tv64 >= fotg210->hr_timeouts[e].tv64) | |
1468 | event_handlers[e](fotg210); | |
1469 | else | |
1470 | fotg210_enable_event(fotg210, e, false); | |
1471 | } | |
1472 | ||
1473 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1474 | return HRTIMER_NORESTART; | |
1475 | } | |
1476 | ||
1477 | /*-------------------------------------------------------------------------*/ | |
1478 | ||
1479 | #define fotg210_bus_suspend NULL | |
1480 | #define fotg210_bus_resume NULL | |
1481 | ||
1482 | /*-------------------------------------------------------------------------*/ | |
1483 | ||
1484 | static int check_reset_complete( | |
1485 | struct fotg210_hcd *fotg210, | |
1486 | int index, | |
1487 | u32 __iomem *status_reg, | |
1488 | int port_status | |
1489 | ) { | |
1490 | if (!(port_status & PORT_CONNECT)) | |
1491 | return port_status; | |
1492 | ||
1493 | /* if reset finished and it's still not enabled -- handoff */ | |
1494 | if (!(port_status & PORT_PE)) { | |
1495 | /* with integrated TT, there's nobody to hand it to! */ | |
1496 | fotg210_dbg(fotg210, | |
1497 | "Failed to enable port %d on root hub TT\n", | |
1498 | index+1); | |
1499 | return port_status; | |
1500 | } else { | |
1501 | fotg210_dbg(fotg210, "port %d reset complete, port enabled\n", | |
1502 | index + 1); | |
1503 | } | |
1504 | ||
1505 | return port_status; | |
1506 | } | |
1507 | ||
1508 | /*-------------------------------------------------------------------------*/ | |
1509 | ||
1510 | ||
1511 | /* build "status change" packet (one or two bytes) from HC registers */ | |
1512 | ||
1513 | static int | |
1514 | fotg210_hub_status_data(struct usb_hcd *hcd, char *buf) | |
1515 | { | |
1516 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
1517 | u32 temp, status; | |
1518 | u32 mask; | |
1519 | int retval = 1; | |
1520 | unsigned long flags; | |
1521 | ||
1522 | /* init status to no-changes */ | |
1523 | buf[0] = 0; | |
1524 | ||
1525 | /* Inform the core about resumes-in-progress by returning | |
1526 | * a non-zero value even if there are no status changes. | |
1527 | */ | |
1528 | status = fotg210->resuming_ports; | |
1529 | ||
1530 | mask = PORT_CSC | PORT_PEC; | |
1531 | /* PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND */ | |
1532 | ||
1533 | /* no hub change reports (bit 0) for now (power, ...) */ | |
1534 | ||
1535 | /* port N changes (bit N)? */ | |
1536 | spin_lock_irqsave(&fotg210->lock, flags); | |
1537 | ||
1538 | temp = fotg210_readl(fotg210, &fotg210->regs->port_status); | |
1539 | ||
1540 | /* | |
1541 | * Return status information even for ports with OWNER set. | |
1542 | * Otherwise khubd wouldn't see the disconnect event when a | |
1543 | * high-speed device is switched over to the companion | |
1544 | * controller by the user. | |
1545 | */ | |
1546 | ||
1547 | if ((temp & mask) != 0 || test_bit(0, &fotg210->port_c_suspend) | |
1548 | || (fotg210->reset_done[0] && time_after_eq( | |
1549 | jiffies, fotg210->reset_done[0]))) { | |
1550 | buf[0] |= 1 << 1; | |
1551 | status = STS_PCD; | |
1552 | } | |
1553 | /* FIXME autosuspend idle root hubs */ | |
1554 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1555 | return status ? retval : 0; | |
1556 | } | |
1557 | ||
1558 | /*-------------------------------------------------------------------------*/ | |
1559 | ||
1560 | static void | |
1561 | fotg210_hub_descriptor( | |
1562 | struct fotg210_hcd *fotg210, | |
1563 | struct usb_hub_descriptor *desc | |
1564 | ) { | |
1565 | int ports = HCS_N_PORTS(fotg210->hcs_params); | |
1566 | u16 temp; | |
1567 | ||
1568 | desc->bDescriptorType = 0x29; | |
1569 | desc->bPwrOn2PwrGood = 10; /* fotg210 1.0, 2.3.9 says 20ms max */ | |
1570 | desc->bHubContrCurrent = 0; | |
1571 | ||
1572 | desc->bNbrPorts = ports; | |
1573 | temp = 1 + (ports / 8); | |
1574 | desc->bDescLength = 7 + 2 * temp; | |
1575 | ||
1576 | /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ | |
1577 | memset(&desc->u.hs.DeviceRemovable[0], 0, temp); | |
1578 | memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp); | |
1579 | ||
1580 | temp = 0x0008; /* per-port overcurrent reporting */ | |
1581 | temp |= 0x0002; /* no power switching */ | |
1582 | desc->wHubCharacteristics = cpu_to_le16(temp); | |
1583 | } | |
1584 | ||
1585 | /*-------------------------------------------------------------------------*/ | |
1586 | ||
1587 | static int fotg210_hub_control( | |
1588 | struct usb_hcd *hcd, | |
1589 | u16 typeReq, | |
1590 | u16 wValue, | |
1591 | u16 wIndex, | |
1592 | char *buf, | |
1593 | u16 wLength | |
1594 | ) { | |
1595 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
1596 | int ports = HCS_N_PORTS(fotg210->hcs_params); | |
1597 | u32 __iomem *status_reg = &fotg210->regs->port_status; | |
1598 | u32 temp, temp1, status; | |
1599 | unsigned long flags; | |
1600 | int retval = 0; | |
1601 | unsigned selector; | |
1602 | ||
1603 | /* | |
1604 | * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR. | |
1605 | * HCS_INDICATOR may say we can change LEDs to off/amber/green. | |
1606 | * (track current state ourselves) ... blink for diagnostics, | |
1607 | * power, "this is the one", etc. EHCI spec supports this. | |
1608 | */ | |
1609 | ||
1610 | spin_lock_irqsave(&fotg210->lock, flags); | |
1611 | switch (typeReq) { | |
1612 | case ClearHubFeature: | |
1613 | switch (wValue) { | |
1614 | case C_HUB_LOCAL_POWER: | |
1615 | case C_HUB_OVER_CURRENT: | |
1616 | /* no hub-wide feature/status flags */ | |
1617 | break; | |
1618 | default: | |
1619 | goto error; | |
1620 | } | |
1621 | break; | |
1622 | case ClearPortFeature: | |
1623 | if (!wIndex || wIndex > ports) | |
1624 | goto error; | |
1625 | wIndex--; | |
1626 | temp = fotg210_readl(fotg210, status_reg); | |
1627 | temp &= ~PORT_RWC_BITS; | |
1628 | ||
1629 | /* | |
1630 | * Even if OWNER is set, so the port is owned by the | |
1631 | * companion controller, khubd needs to be able to clear | |
1632 | * the port-change status bits (especially | |
1633 | * USB_PORT_STAT_C_CONNECTION). | |
1634 | */ | |
1635 | ||
1636 | switch (wValue) { | |
1637 | case USB_PORT_FEAT_ENABLE: | |
1638 | fotg210_writel(fotg210, temp & ~PORT_PE, status_reg); | |
1639 | break; | |
1640 | case USB_PORT_FEAT_C_ENABLE: | |
1641 | fotg210_writel(fotg210, temp | PORT_PEC, status_reg); | |
1642 | break; | |
1643 | case USB_PORT_FEAT_SUSPEND: | |
1644 | if (temp & PORT_RESET) | |
1645 | goto error; | |
1646 | if (!(temp & PORT_SUSPEND)) | |
1647 | break; | |
1648 | if ((temp & PORT_PE) == 0) | |
1649 | goto error; | |
1650 | ||
1651 | /* resume signaling for 20 msec */ | |
1652 | fotg210_writel(fotg210, temp | PORT_RESUME, status_reg); | |
1653 | fotg210->reset_done[wIndex] = jiffies | |
1654 | + msecs_to_jiffies(20); | |
1655 | break; | |
1656 | case USB_PORT_FEAT_C_SUSPEND: | |
1657 | clear_bit(wIndex, &fotg210->port_c_suspend); | |
1658 | break; | |
1659 | case USB_PORT_FEAT_C_CONNECTION: | |
1660 | fotg210_writel(fotg210, temp | PORT_CSC, status_reg); | |
1661 | break; | |
1662 | case USB_PORT_FEAT_C_OVER_CURRENT: | |
1663 | fotg210_writel(fotg210, temp | OTGISR_OVC, | |
1664 | &fotg210->regs->otgisr); | |
1665 | break; | |
1666 | case USB_PORT_FEAT_C_RESET: | |
1667 | /* GetPortStatus clears reset */ | |
1668 | break; | |
1669 | default: | |
1670 | goto error; | |
1671 | } | |
1672 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1673 | break; | |
1674 | case GetHubDescriptor: | |
1675 | fotg210_hub_descriptor(fotg210, (struct usb_hub_descriptor *) | |
1676 | buf); | |
1677 | break; | |
1678 | case GetHubStatus: | |
1679 | /* no hub-wide feature/status flags */ | |
1680 | memset(buf, 0, 4); | |
1681 | /*cpu_to_le32s ((u32 *) buf); */ | |
1682 | break; | |
1683 | case GetPortStatus: | |
1684 | if (!wIndex || wIndex > ports) | |
1685 | goto error; | |
1686 | wIndex--; | |
1687 | status = 0; | |
1688 | temp = fotg210_readl(fotg210, status_reg); | |
1689 | ||
1690 | /* wPortChange bits */ | |
1691 | if (temp & PORT_CSC) | |
1692 | status |= USB_PORT_STAT_C_CONNECTION << 16; | |
1693 | if (temp & PORT_PEC) | |
1694 | status |= USB_PORT_STAT_C_ENABLE << 16; | |
1695 | ||
1696 | temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr); | |
1697 | if (temp1 & OTGISR_OVC) | |
1698 | status |= USB_PORT_STAT_C_OVERCURRENT << 16; | |
1699 | ||
1700 | /* whoever resumes must GetPortStatus to complete it!! */ | |
1701 | if (temp & PORT_RESUME) { | |
1702 | ||
1703 | /* Remote Wakeup received? */ | |
1704 | if (!fotg210->reset_done[wIndex]) { | |
1705 | /* resume signaling for 20 msec */ | |
1706 | fotg210->reset_done[wIndex] = jiffies | |
1707 | + msecs_to_jiffies(20); | |
1708 | /* check the port again */ | |
1709 | mod_timer(&fotg210_to_hcd(fotg210)->rh_timer, | |
1710 | fotg210->reset_done[wIndex]); | |
1711 | } | |
1712 | ||
1713 | /* resume completed? */ | |
1714 | else if (time_after_eq(jiffies, | |
1715 | fotg210->reset_done[wIndex])) { | |
1716 | clear_bit(wIndex, &fotg210->suspended_ports); | |
1717 | set_bit(wIndex, &fotg210->port_c_suspend); | |
1718 | fotg210->reset_done[wIndex] = 0; | |
1719 | ||
1720 | /* stop resume signaling */ | |
1721 | temp = fotg210_readl(fotg210, status_reg); | |
1722 | fotg210_writel(fotg210, | |
1723 | temp & ~(PORT_RWC_BITS | PORT_RESUME), | |
1724 | status_reg); | |
1725 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1726 | retval = handshake(fotg210, status_reg, | |
1727 | PORT_RESUME, 0, 2000 /* 2msec */); | |
1728 | if (retval != 0) { | |
1729 | fotg210_err(fotg210, | |
1730 | "port %d resume error %d\n", | |
1731 | wIndex + 1, retval); | |
1732 | goto error; | |
1733 | } | |
1734 | temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10)); | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | /* whoever resets must GetPortStatus to complete it!! */ | |
1739 | if ((temp & PORT_RESET) | |
1740 | && time_after_eq(jiffies, | |
1741 | fotg210->reset_done[wIndex])) { | |
1742 | status |= USB_PORT_STAT_C_RESET << 16; | |
1743 | fotg210->reset_done[wIndex] = 0; | |
1744 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1745 | ||
1746 | /* force reset to complete */ | |
1747 | fotg210_writel(fotg210, | |
1748 | temp & ~(PORT_RWC_BITS | PORT_RESET), | |
1749 | status_reg); | |
1750 | /* REVISIT: some hardware needs 550+ usec to clear | |
1751 | * this bit; seems too long to spin routinely... | |
1752 | */ | |
1753 | retval = handshake(fotg210, status_reg, | |
1754 | PORT_RESET, 0, 1000); | |
1755 | if (retval != 0) { | |
1756 | fotg210_err(fotg210, "port %d reset error %d\n", | |
1757 | wIndex + 1, retval); | |
1758 | goto error; | |
1759 | } | |
1760 | ||
1761 | /* see what we found out */ | |
1762 | temp = check_reset_complete(fotg210, wIndex, status_reg, | |
1763 | fotg210_readl(fotg210, status_reg)); | |
1764 | } | |
1765 | ||
1766 | if (!(temp & (PORT_RESUME|PORT_RESET))) { | |
1767 | fotg210->reset_done[wIndex] = 0; | |
1768 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1769 | } | |
1770 | ||
1771 | /* transfer dedicated ports to the companion hc */ | |
1772 | if ((temp & PORT_CONNECT) && | |
1773 | test_bit(wIndex, &fotg210->companion_ports)) { | |
1774 | temp &= ~PORT_RWC_BITS; | |
1775 | fotg210_writel(fotg210, temp, status_reg); | |
1776 | fotg210_dbg(fotg210, "port %d --> companion\n", | |
1777 | wIndex + 1); | |
1778 | temp = fotg210_readl(fotg210, status_reg); | |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * Even if OWNER is set, there's no harm letting khubd | |
1783 | * see the wPortStatus values (they should all be 0 except | |
1784 | * for PORT_POWER anyway). | |
1785 | */ | |
1786 | ||
1787 | if (temp & PORT_CONNECT) { | |
1788 | status |= USB_PORT_STAT_CONNECTION; | |
1789 | status |= fotg210_port_speed(fotg210, temp); | |
1790 | } | |
1791 | if (temp & PORT_PE) | |
1792 | status |= USB_PORT_STAT_ENABLE; | |
1793 | ||
1794 | /* maybe the port was unsuspended without our knowledge */ | |
1795 | if (temp & (PORT_SUSPEND|PORT_RESUME)) { | |
1796 | status |= USB_PORT_STAT_SUSPEND; | |
1797 | } else if (test_bit(wIndex, &fotg210->suspended_ports)) { | |
1798 | clear_bit(wIndex, &fotg210->suspended_ports); | |
1799 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1800 | fotg210->reset_done[wIndex] = 0; | |
1801 | if (temp & PORT_PE) | |
1802 | set_bit(wIndex, &fotg210->port_c_suspend); | |
1803 | } | |
1804 | ||
1805 | temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr); | |
1806 | if (temp1 & OTGISR_OVC) | |
1807 | status |= USB_PORT_STAT_OVERCURRENT; | |
1808 | if (temp & PORT_RESET) | |
1809 | status |= USB_PORT_STAT_RESET; | |
1810 | if (test_bit(wIndex, &fotg210->port_c_suspend)) | |
1811 | status |= USB_PORT_STAT_C_SUSPEND << 16; | |
1812 | ||
1813 | #ifndef VERBOSE_DEBUG | |
1814 | if (status & ~0xffff) /* only if wPortChange is interesting */ | |
1815 | #endif | |
1816 | dbg_port(fotg210, "GetStatus", wIndex + 1, temp); | |
1817 | put_unaligned_le32(status, buf); | |
1818 | break; | |
1819 | case SetHubFeature: | |
1820 | switch (wValue) { | |
1821 | case C_HUB_LOCAL_POWER: | |
1822 | case C_HUB_OVER_CURRENT: | |
1823 | /* no hub-wide feature/status flags */ | |
1824 | break; | |
1825 | default: | |
1826 | goto error; | |
1827 | } | |
1828 | break; | |
1829 | case SetPortFeature: | |
1830 | selector = wIndex >> 8; | |
1831 | wIndex &= 0xff; | |
1832 | ||
1833 | if (!wIndex || wIndex > ports) | |
1834 | goto error; | |
1835 | wIndex--; | |
1836 | temp = fotg210_readl(fotg210, status_reg); | |
1837 | temp &= ~PORT_RWC_BITS; | |
1838 | switch (wValue) { | |
1839 | case USB_PORT_FEAT_SUSPEND: | |
1840 | if ((temp & PORT_PE) == 0 | |
1841 | || (temp & PORT_RESET) != 0) | |
1842 | goto error; | |
1843 | ||
1844 | /* After above check the port must be connected. | |
1845 | * Set appropriate bit thus could put phy into low power | |
1846 | * mode if we have hostpc feature | |
1847 | */ | |
1848 | fotg210_writel(fotg210, temp | PORT_SUSPEND, | |
1849 | status_reg); | |
1850 | set_bit(wIndex, &fotg210->suspended_ports); | |
1851 | break; | |
1852 | case USB_PORT_FEAT_RESET: | |
1853 | if (temp & PORT_RESUME) | |
1854 | goto error; | |
1855 | /* line status bits may report this as low speed, | |
1856 | * which can be fine if this root hub has a | |
1857 | * transaction translator built in. | |
1858 | */ | |
1859 | fotg210_vdbg(fotg210, "port %d reset\n", wIndex + 1); | |
1860 | temp |= PORT_RESET; | |
1861 | temp &= ~PORT_PE; | |
1862 | ||
1863 | /* | |
1864 | * caller must wait, then call GetPortStatus | |
1865 | * usb 2.0 spec says 50 ms resets on root | |
1866 | */ | |
1867 | fotg210->reset_done[wIndex] = jiffies | |
1868 | + msecs_to_jiffies(50); | |
1869 | fotg210_writel(fotg210, temp, status_reg); | |
1870 | break; | |
1871 | ||
1872 | /* For downstream facing ports (these): one hub port is put | |
1873 | * into test mode according to USB2 11.24.2.13, then the hub | |
1874 | * must be reset (which for root hub now means rmmod+modprobe, | |
1875 | * or else system reboot). See EHCI 2.3.9 and 4.14 for info | |
1876 | * about the EHCI-specific stuff. | |
1877 | */ | |
1878 | case USB_PORT_FEAT_TEST: | |
1879 | if (!selector || selector > 5) | |
1880 | goto error; | |
1881 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1882 | fotg210_quiesce(fotg210); | |
1883 | spin_lock_irqsave(&fotg210->lock, flags); | |
1884 | ||
1885 | /* Put all enabled ports into suspend */ | |
1886 | temp = fotg210_readl(fotg210, status_reg) & | |
1887 | ~PORT_RWC_BITS; | |
1888 | if (temp & PORT_PE) | |
1889 | fotg210_writel(fotg210, temp | PORT_SUSPEND, | |
1890 | status_reg); | |
1891 | ||
1892 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1893 | fotg210_halt(fotg210); | |
1894 | spin_lock_irqsave(&fotg210->lock, flags); | |
1895 | ||
1896 | temp = fotg210_readl(fotg210, status_reg); | |
1897 | temp |= selector << 16; | |
1898 | fotg210_writel(fotg210, temp, status_reg); | |
1899 | break; | |
1900 | ||
1901 | default: | |
1902 | goto error; | |
1903 | } | |
1904 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1905 | break; | |
1906 | ||
1907 | default: | |
1908 | error: | |
1909 | /* "stall" on error */ | |
1910 | retval = -EPIPE; | |
1911 | } | |
1912 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1913 | return retval; | |
1914 | } | |
1915 | ||
1916 | static void __maybe_unused fotg210_relinquish_port(struct usb_hcd *hcd, | |
1917 | int portnum) | |
1918 | { | |
1919 | return; | |
1920 | } | |
1921 | ||
1922 | static int __maybe_unused fotg210_port_handed_over(struct usb_hcd *hcd, | |
1923 | int portnum) | |
1924 | { | |
1925 | return 0; | |
1926 | } | |
1927 | /*-------------------------------------------------------------------------*/ | |
1928 | /* | |
1929 | * There's basically three types of memory: | |
1930 | * - data used only by the HCD ... kmalloc is fine | |
1931 | * - async and periodic schedules, shared by HC and HCD ... these | |
1932 | * need to use dma_pool or dma_alloc_coherent | |
1933 | * - driver buffers, read/written by HC ... single shot DMA mapped | |
1934 | * | |
1935 | * There's also "register" data (e.g. PCI or SOC), which is memory mapped. | |
1936 | * No memory seen by this driver is pageable. | |
1937 | */ | |
1938 | ||
1939 | /*-------------------------------------------------------------------------*/ | |
1940 | ||
1941 | /* Allocate the key transfer structures from the previously allocated pool */ | |
1942 | ||
1943 | static inline void fotg210_qtd_init(struct fotg210_hcd *fotg210, | |
1944 | struct fotg210_qtd *qtd, dma_addr_t dma) | |
1945 | { | |
1946 | memset(qtd, 0, sizeof(*qtd)); | |
1947 | qtd->qtd_dma = dma; | |
1948 | qtd->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT); | |
1949 | qtd->hw_next = FOTG210_LIST_END(fotg210); | |
1950 | qtd->hw_alt_next = FOTG210_LIST_END(fotg210); | |
1951 | INIT_LIST_HEAD(&qtd->qtd_list); | |
1952 | } | |
1953 | ||
1954 | static struct fotg210_qtd *fotg210_qtd_alloc(struct fotg210_hcd *fotg210, | |
1955 | gfp_t flags) | |
1956 | { | |
1957 | struct fotg210_qtd *qtd; | |
1958 | dma_addr_t dma; | |
1959 | ||
1960 | qtd = dma_pool_alloc(fotg210->qtd_pool, flags, &dma); | |
1961 | if (qtd != NULL) | |
1962 | fotg210_qtd_init(fotg210, qtd, dma); | |
1963 | ||
1964 | return qtd; | |
1965 | } | |
1966 | ||
1967 | static inline void fotg210_qtd_free(struct fotg210_hcd *fotg210, | |
1968 | struct fotg210_qtd *qtd) | |
1969 | { | |
1970 | dma_pool_free(fotg210->qtd_pool, qtd, qtd->qtd_dma); | |
1971 | } | |
1972 | ||
1973 | ||
1974 | static void qh_destroy(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
1975 | { | |
1976 | /* clean qtds first, and know this is not linked */ | |
1977 | if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) { | |
1978 | fotg210_dbg(fotg210, "unused qh not empty!\n"); | |
1979 | BUG(); | |
1980 | } | |
1981 | if (qh->dummy) | |
1982 | fotg210_qtd_free(fotg210, qh->dummy); | |
1983 | dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma); | |
1984 | kfree(qh); | |
1985 | } | |
1986 | ||
1987 | static struct fotg210_qh *fotg210_qh_alloc(struct fotg210_hcd *fotg210, | |
1988 | gfp_t flags) | |
1989 | { | |
1990 | struct fotg210_qh *qh; | |
1991 | dma_addr_t dma; | |
1992 | ||
1993 | qh = kzalloc(sizeof(*qh), GFP_ATOMIC); | |
1994 | if (!qh) | |
1995 | goto done; | |
1996 | qh->hw = (struct fotg210_qh_hw *) | |
1997 | dma_pool_alloc(fotg210->qh_pool, flags, &dma); | |
1998 | if (!qh->hw) | |
1999 | goto fail; | |
2000 | memset(qh->hw, 0, sizeof(*qh->hw)); | |
2001 | qh->qh_dma = dma; | |
2002 | INIT_LIST_HEAD(&qh->qtd_list); | |
2003 | ||
2004 | /* dummy td enables safe urb queuing */ | |
2005 | qh->dummy = fotg210_qtd_alloc(fotg210, flags); | |
2006 | if (qh->dummy == NULL) { | |
2007 | fotg210_dbg(fotg210, "no dummy td\n"); | |
2008 | goto fail1; | |
2009 | } | |
2010 | done: | |
2011 | return qh; | |
2012 | fail1: | |
2013 | dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma); | |
2014 | fail: | |
2015 | kfree(qh); | |
2016 | return NULL; | |
2017 | } | |
2018 | ||
2019 | /*-------------------------------------------------------------------------*/ | |
2020 | ||
2021 | /* The queue heads and transfer descriptors are managed from pools tied | |
2022 | * to each of the "per device" structures. | |
2023 | * This is the initialisation and cleanup code. | |
2024 | */ | |
2025 | ||
2026 | static void fotg210_mem_cleanup(struct fotg210_hcd *fotg210) | |
2027 | { | |
2028 | if (fotg210->async) | |
2029 | qh_destroy(fotg210, fotg210->async); | |
2030 | fotg210->async = NULL; | |
2031 | ||
2032 | if (fotg210->dummy) | |
2033 | qh_destroy(fotg210, fotg210->dummy); | |
2034 | fotg210->dummy = NULL; | |
2035 | ||
2036 | /* DMA consistent memory and pools */ | |
2037 | if (fotg210->qtd_pool) | |
2038 | dma_pool_destroy(fotg210->qtd_pool); | |
2039 | fotg210->qtd_pool = NULL; | |
2040 | ||
2041 | if (fotg210->qh_pool) { | |
2042 | dma_pool_destroy(fotg210->qh_pool); | |
2043 | fotg210->qh_pool = NULL; | |
2044 | } | |
2045 | ||
2046 | if (fotg210->itd_pool) | |
2047 | dma_pool_destroy(fotg210->itd_pool); | |
2048 | fotg210->itd_pool = NULL; | |
2049 | ||
2050 | if (fotg210->periodic) | |
2051 | dma_free_coherent(fotg210_to_hcd(fotg210)->self.controller, | |
2052 | fotg210->periodic_size * sizeof(u32), | |
2053 | fotg210->periodic, fotg210->periodic_dma); | |
2054 | fotg210->periodic = NULL; | |
2055 | ||
2056 | /* shadow periodic table */ | |
2057 | kfree(fotg210->pshadow); | |
2058 | fotg210->pshadow = NULL; | |
2059 | } | |
2060 | ||
2061 | /* remember to add cleanup code (above) if you add anything here */ | |
2062 | static int fotg210_mem_init(struct fotg210_hcd *fotg210, gfp_t flags) | |
2063 | { | |
2064 | int i; | |
2065 | ||
2066 | /* QTDs for control/bulk/intr transfers */ | |
2067 | fotg210->qtd_pool = dma_pool_create("fotg210_qtd", | |
2068 | fotg210_to_hcd(fotg210)->self.controller, | |
2069 | sizeof(struct fotg210_qtd), | |
2070 | 32 /* byte alignment (for hw parts) */, | |
2071 | 4096 /* can't cross 4K */); | |
2072 | if (!fotg210->qtd_pool) | |
2073 | goto fail; | |
2074 | ||
2075 | /* QHs for control/bulk/intr transfers */ | |
2076 | fotg210->qh_pool = dma_pool_create("fotg210_qh", | |
2077 | fotg210_to_hcd(fotg210)->self.controller, | |
2078 | sizeof(struct fotg210_qh_hw), | |
2079 | 32 /* byte alignment (for hw parts) */, | |
2080 | 4096 /* can't cross 4K */); | |
2081 | if (!fotg210->qh_pool) | |
2082 | goto fail; | |
2083 | ||
2084 | fotg210->async = fotg210_qh_alloc(fotg210, flags); | |
2085 | if (!fotg210->async) | |
2086 | goto fail; | |
2087 | ||
2088 | /* ITD for high speed ISO transfers */ | |
2089 | fotg210->itd_pool = dma_pool_create("fotg210_itd", | |
2090 | fotg210_to_hcd(fotg210)->self.controller, | |
2091 | sizeof(struct fotg210_itd), | |
2092 | 64 /* byte alignment (for hw parts) */, | |
2093 | 4096 /* can't cross 4K */); | |
2094 | if (!fotg210->itd_pool) | |
2095 | goto fail; | |
2096 | ||
2097 | /* Hardware periodic table */ | |
2098 | fotg210->periodic = (__le32 *) | |
2099 | dma_alloc_coherent(fotg210_to_hcd(fotg210)->self.controller, | |
2100 | fotg210->periodic_size * sizeof(__le32), | |
2101 | &fotg210->periodic_dma, 0); | |
2102 | if (fotg210->periodic == NULL) | |
2103 | goto fail; | |
2104 | ||
2105 | for (i = 0; i < fotg210->periodic_size; i++) | |
2106 | fotg210->periodic[i] = FOTG210_LIST_END(fotg210); | |
2107 | ||
2108 | /* software shadow of hardware table */ | |
2109 | fotg210->pshadow = kcalloc(fotg210->periodic_size, sizeof(void *), | |
2110 | flags); | |
2111 | if (fotg210->pshadow != NULL) | |
2112 | return 0; | |
2113 | ||
2114 | fail: | |
2115 | fotg210_dbg(fotg210, "couldn't init memory\n"); | |
2116 | fotg210_mem_cleanup(fotg210); | |
2117 | return -ENOMEM; | |
2118 | } | |
2119 | /*-------------------------------------------------------------------------*/ | |
2120 | /* | |
2121 | * EHCI hardware queue manipulation ... the core. QH/QTD manipulation. | |
2122 | * | |
2123 | * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd" | |
2124 | * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned | |
2125 | * buffers needed for the larger number). We use one QH per endpoint, queue | |
2126 | * multiple urbs (all three types) per endpoint. URBs may need several qtds. | |
2127 | * | |
2128 | * ISO traffic uses "ISO TD" (itd) records, and (along with | |
2129 | * interrupts) needs careful scheduling. Performance improvements can be | |
2130 | * an ongoing challenge. That's in "ehci-sched.c". | |
2131 | * | |
2132 | * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs, | |
2133 | * or otherwise through transaction translators (TTs) in USB 2.0 hubs using | |
2134 | * (b) special fields in qh entries or (c) split iso entries. TTs will | |
2135 | * buffer low/full speed data so the host collects it at high speed. | |
2136 | */ | |
2137 | ||
2138 | /*-------------------------------------------------------------------------*/ | |
2139 | ||
2140 | /* fill a qtd, returning how much of the buffer we were able to queue up */ | |
2141 | ||
2142 | static int | |
2143 | qtd_fill(struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd, dma_addr_t buf, | |
2144 | size_t len, int token, int maxpacket) | |
2145 | { | |
2146 | int i, count; | |
2147 | u64 addr = buf; | |
2148 | ||
2149 | /* one buffer entry per 4K ... first might be short or unaligned */ | |
2150 | qtd->hw_buf[0] = cpu_to_hc32(fotg210, (u32)addr); | |
2151 | qtd->hw_buf_hi[0] = cpu_to_hc32(fotg210, (u32)(addr >> 32)); | |
2152 | count = 0x1000 - (buf & 0x0fff); /* rest of that page */ | |
2153 | if (likely(len < count)) /* ... iff needed */ | |
2154 | count = len; | |
2155 | else { | |
2156 | buf += 0x1000; | |
2157 | buf &= ~0x0fff; | |
2158 | ||
2159 | /* per-qtd limit: from 16K to 20K (best alignment) */ | |
2160 | for (i = 1; count < len && i < 5; i++) { | |
2161 | addr = buf; | |
2162 | qtd->hw_buf[i] = cpu_to_hc32(fotg210, (u32)addr); | |
2163 | qtd->hw_buf_hi[i] = cpu_to_hc32(fotg210, | |
2164 | (u32)(addr >> 32)); | |
2165 | buf += 0x1000; | |
2166 | if ((count + 0x1000) < len) | |
2167 | count += 0x1000; | |
2168 | else | |
2169 | count = len; | |
2170 | } | |
2171 | ||
2172 | /* short packets may only terminate transfers */ | |
2173 | if (count != len) | |
2174 | count -= (count % maxpacket); | |
2175 | } | |
2176 | qtd->hw_token = cpu_to_hc32(fotg210, (count << 16) | token); | |
2177 | qtd->length = count; | |
2178 | ||
2179 | return count; | |
2180 | } | |
2181 | ||
2182 | /*-------------------------------------------------------------------------*/ | |
2183 | ||
2184 | static inline void | |
2185 | qh_update(struct fotg210_hcd *fotg210, struct fotg210_qh *qh, | |
2186 | struct fotg210_qtd *qtd) | |
2187 | { | |
2188 | struct fotg210_qh_hw *hw = qh->hw; | |
2189 | ||
2190 | /* writes to an active overlay are unsafe */ | |
2191 | BUG_ON(qh->qh_state != QH_STATE_IDLE); | |
2192 | ||
2193 | hw->hw_qtd_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2194 | hw->hw_alt_next = FOTG210_LIST_END(fotg210); | |
2195 | ||
2196 | /* Except for control endpoints, we make hardware maintain data | |
2197 | * toggle (like OHCI) ... here (re)initialize the toggle in the QH, | |
2198 | * and set the pseudo-toggle in udev. Only usb_clear_halt() will | |
2199 | * ever clear it. | |
2200 | */ | |
2201 | if (!(hw->hw_info1 & cpu_to_hc32(fotg210, QH_TOGGLE_CTL))) { | |
2202 | unsigned is_out, epnum; | |
2203 | ||
2204 | is_out = qh->is_out; | |
2205 | epnum = (hc32_to_cpup(fotg210, &hw->hw_info1) >> 8) & 0x0f; | |
2206 | if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) { | |
2207 | hw->hw_token &= ~cpu_to_hc32(fotg210, QTD_TOGGLE); | |
2208 | usb_settoggle(qh->dev, epnum, is_out, 1); | |
2209 | } | |
2210 | } | |
2211 | ||
2212 | hw->hw_token &= cpu_to_hc32(fotg210, QTD_TOGGLE | QTD_STS_PING); | |
2213 | } | |
2214 | ||
2215 | /* if it weren't for a common silicon quirk (writing the dummy into the qh | |
2216 | * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault | |
2217 | * recovery (including urb dequeue) would need software changes to a QH... | |
2218 | */ | |
2219 | static void | |
2220 | qh_refresh(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
2221 | { | |
2222 | struct fotg210_qtd *qtd; | |
2223 | ||
2224 | if (list_empty(&qh->qtd_list)) | |
2225 | qtd = qh->dummy; | |
2226 | else { | |
2227 | qtd = list_entry(qh->qtd_list.next, | |
2228 | struct fotg210_qtd, qtd_list); | |
2229 | /* | |
2230 | * first qtd may already be partially processed. | |
2231 | * If we come here during unlink, the QH overlay region | |
2232 | * might have reference to the just unlinked qtd. The | |
2233 | * qtd is updated in qh_completions(). Update the QH | |
2234 | * overlay here. | |
2235 | */ | |
2236 | if (cpu_to_hc32(fotg210, qtd->qtd_dma) == qh->hw->hw_current) { | |
2237 | qh->hw->hw_qtd_next = qtd->hw_next; | |
2238 | qtd = NULL; | |
2239 | } | |
2240 | } | |
2241 | ||
2242 | if (qtd) | |
2243 | qh_update(fotg210, qh, qtd); | |
2244 | } | |
2245 | ||
2246 | /*-------------------------------------------------------------------------*/ | |
2247 | ||
2248 | static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); | |
2249 | ||
2250 | static void fotg210_clear_tt_buffer_complete(struct usb_hcd *hcd, | |
2251 | struct usb_host_endpoint *ep) | |
2252 | { | |
2253 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
2254 | struct fotg210_qh *qh = ep->hcpriv; | |
2255 | unsigned long flags; | |
2256 | ||
2257 | spin_lock_irqsave(&fotg210->lock, flags); | |
2258 | qh->clearing_tt = 0; | |
2259 | if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list) | |
2260 | && fotg210->rh_state == FOTG210_RH_RUNNING) | |
2261 | qh_link_async(fotg210, qh); | |
2262 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
2263 | } | |
2264 | ||
2265 | static void fotg210_clear_tt_buffer(struct fotg210_hcd *fotg210, | |
2266 | struct fotg210_qh *qh, | |
2267 | struct urb *urb, u32 token) | |
2268 | { | |
2269 | ||
2270 | /* If an async split transaction gets an error or is unlinked, | |
2271 | * the TT buffer may be left in an indeterminate state. We | |
2272 | * have to clear the TT buffer. | |
2273 | * | |
2274 | * Note: this routine is never called for Isochronous transfers. | |
2275 | */ | |
2276 | if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) { | |
2277 | #ifdef DEBUG | |
2278 | struct usb_device *tt = urb->dev->tt->hub; | |
2279 | dev_dbg(&tt->dev, | |
2280 | "clear tt buffer port %d, a%d ep%d t%08x\n", | |
2281 | urb->dev->ttport, urb->dev->devnum, | |
2282 | usb_pipeendpoint(urb->pipe), token); | |
2283 | #endif /* DEBUG */ | |
2284 | if (urb->dev->tt->hub != | |
2285 | fotg210_to_hcd(fotg210)->self.root_hub) { | |
2286 | if (usb_hub_clear_tt_buffer(urb) == 0) | |
2287 | qh->clearing_tt = 1; | |
2288 | } | |
2289 | } | |
2290 | } | |
2291 | ||
2292 | static int qtd_copy_status( | |
2293 | struct fotg210_hcd *fotg210, | |
2294 | struct urb *urb, | |
2295 | size_t length, | |
2296 | u32 token | |
2297 | ) | |
2298 | { | |
2299 | int status = -EINPROGRESS; | |
2300 | ||
2301 | /* count IN/OUT bytes, not SETUP (even short packets) */ | |
2302 | if (likely(QTD_PID(token) != 2)) | |
2303 | urb->actual_length += length - QTD_LENGTH(token); | |
2304 | ||
2305 | /* don't modify error codes */ | |
2306 | if (unlikely(urb->unlinked)) | |
2307 | return status; | |
2308 | ||
2309 | /* force cleanup after short read; not always an error */ | |
2310 | if (unlikely(IS_SHORT_READ(token))) | |
2311 | status = -EREMOTEIO; | |
2312 | ||
2313 | /* serious "can't proceed" faults reported by the hardware */ | |
2314 | if (token & QTD_STS_HALT) { | |
2315 | if (token & QTD_STS_BABBLE) { | |
2316 | /* FIXME "must" disable babbling device's port too */ | |
2317 | status = -EOVERFLOW; | |
2318 | /* CERR nonzero + halt --> stall */ | |
2319 | } else if (QTD_CERR(token)) { | |
2320 | status = -EPIPE; | |
2321 | ||
2322 | /* In theory, more than one of the following bits can be set | |
2323 | * since they are sticky and the transaction is retried. | |
2324 | * Which to test first is rather arbitrary. | |
2325 | */ | |
2326 | } else if (token & QTD_STS_MMF) { | |
2327 | /* fs/ls interrupt xfer missed the complete-split */ | |
2328 | status = -EPROTO; | |
2329 | } else if (token & QTD_STS_DBE) { | |
2330 | status = (QTD_PID(token) == 1) /* IN ? */ | |
2331 | ? -ENOSR /* hc couldn't read data */ | |
2332 | : -ECOMM; /* hc couldn't write data */ | |
2333 | } else if (token & QTD_STS_XACT) { | |
2334 | /* timeout, bad CRC, wrong PID, etc */ | |
2335 | fotg210_dbg(fotg210, "devpath %s ep%d%s 3strikes\n", | |
2336 | urb->dev->devpath, | |
2337 | usb_pipeendpoint(urb->pipe), | |
2338 | usb_pipein(urb->pipe) ? "in" : "out"); | |
2339 | status = -EPROTO; | |
2340 | } else { /* unknown */ | |
2341 | status = -EPROTO; | |
2342 | } | |
2343 | ||
2344 | fotg210_vdbg(fotg210, | |
2345 | "dev%d ep%d%s qtd token %08x --> status %d\n", | |
2346 | usb_pipedevice(urb->pipe), | |
2347 | usb_pipeendpoint(urb->pipe), | |
2348 | usb_pipein(urb->pipe) ? "in" : "out", | |
2349 | token, status); | |
2350 | } | |
2351 | ||
2352 | return status; | |
2353 | } | |
2354 | ||
2355 | static void | |
2356 | fotg210_urb_done(struct fotg210_hcd *fotg210, struct urb *urb, int status) | |
2357 | __releases(fotg210->lock) | |
2358 | __acquires(fotg210->lock) | |
2359 | { | |
2360 | if (likely(urb->hcpriv != NULL)) { | |
2361 | struct fotg210_qh *qh = (struct fotg210_qh *) urb->hcpriv; | |
2362 | ||
2363 | /* S-mask in a QH means it's an interrupt urb */ | |
2364 | if ((qh->hw->hw_info2 & cpu_to_hc32(fotg210, QH_SMASK)) != 0) { | |
2365 | ||
2366 | /* ... update hc-wide periodic stats (for usbfs) */ | |
2367 | fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs--; | |
2368 | } | |
2369 | } | |
2370 | ||
2371 | if (unlikely(urb->unlinked)) { | |
2372 | COUNT(fotg210->stats.unlink); | |
2373 | } else { | |
2374 | /* report non-error and short read status as zero */ | |
2375 | if (status == -EINPROGRESS || status == -EREMOTEIO) | |
2376 | status = 0; | |
2377 | COUNT(fotg210->stats.complete); | |
2378 | } | |
2379 | ||
2380 | #ifdef FOTG210_URB_TRACE | |
2381 | fotg210_dbg(fotg210, | |
2382 | "%s %s urb %p ep%d%s status %d len %d/%d\n", | |
2383 | __func__, urb->dev->devpath, urb, | |
2384 | usb_pipeendpoint(urb->pipe), | |
2385 | usb_pipein(urb->pipe) ? "in" : "out", | |
2386 | status, | |
2387 | urb->actual_length, urb->transfer_buffer_length); | |
2388 | #endif | |
2389 | ||
2390 | /* complete() can reenter this HCD */ | |
2391 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
2392 | spin_unlock(&fotg210->lock); | |
2393 | usb_hcd_giveback_urb(fotg210_to_hcd(fotg210), urb, status); | |
2394 | spin_lock(&fotg210->lock); | |
2395 | } | |
2396 | ||
2397 | static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); | |
2398 | ||
2399 | /* | |
2400 | * Process and free completed qtds for a qh, returning URBs to drivers. | |
2401 | * Chases up to qh->hw_current. Returns number of completions called, | |
2402 | * indicating how much "real" work we did. | |
2403 | */ | |
2404 | static unsigned | |
2405 | qh_completions(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
2406 | { | |
2407 | struct fotg210_qtd *last, *end = qh->dummy; | |
2408 | struct list_head *entry, *tmp; | |
2409 | int last_status; | |
2410 | int stopped; | |
2411 | unsigned count = 0; | |
2412 | u8 state; | |
2413 | struct fotg210_qh_hw *hw = qh->hw; | |
2414 | ||
2415 | if (unlikely(list_empty(&qh->qtd_list))) | |
2416 | return count; | |
2417 | ||
2418 | /* completions (or tasks on other cpus) must never clobber HALT | |
2419 | * till we've gone through and cleaned everything up, even when | |
2420 | * they add urbs to this qh's queue or mark them for unlinking. | |
2421 | * | |
2422 | * NOTE: unlinking expects to be done in queue order. | |
2423 | * | |
2424 | * It's a bug for qh->qh_state to be anything other than | |
2425 | * QH_STATE_IDLE, unless our caller is scan_async() or | |
2426 | * scan_intr(). | |
2427 | */ | |
2428 | state = qh->qh_state; | |
2429 | qh->qh_state = QH_STATE_COMPLETING; | |
2430 | stopped = (state == QH_STATE_IDLE); | |
2431 | ||
2432 | rescan: | |
2433 | last = NULL; | |
2434 | last_status = -EINPROGRESS; | |
2435 | qh->needs_rescan = 0; | |
2436 | ||
2437 | /* remove de-activated QTDs from front of queue. | |
2438 | * after faults (including short reads), cleanup this urb | |
2439 | * then let the queue advance. | |
2440 | * if queue is stopped, handles unlinks. | |
2441 | */ | |
2442 | list_for_each_safe(entry, tmp, &qh->qtd_list) { | |
2443 | struct fotg210_qtd *qtd; | |
2444 | struct urb *urb; | |
2445 | u32 token = 0; | |
2446 | ||
2447 | qtd = list_entry(entry, struct fotg210_qtd, qtd_list); | |
2448 | urb = qtd->urb; | |
2449 | ||
2450 | /* clean up any state from previous QTD ...*/ | |
2451 | if (last) { | |
2452 | if (likely(last->urb != urb)) { | |
2453 | fotg210_urb_done(fotg210, last->urb, | |
2454 | last_status); | |
2455 | count++; | |
2456 | last_status = -EINPROGRESS; | |
2457 | } | |
2458 | fotg210_qtd_free(fotg210, last); | |
2459 | last = NULL; | |
2460 | } | |
2461 | ||
2462 | /* ignore urbs submitted during completions we reported */ | |
2463 | if (qtd == end) | |
2464 | break; | |
2465 | ||
2466 | /* hardware copies qtd out of qh overlay */ | |
2467 | rmb(); | |
2468 | token = hc32_to_cpu(fotg210, qtd->hw_token); | |
2469 | ||
2470 | /* always clean up qtds the hc de-activated */ | |
2471 | retry_xacterr: | |
2472 | if ((token & QTD_STS_ACTIVE) == 0) { | |
2473 | ||
2474 | /* Report Data Buffer Error: non-fatal but useful */ | |
2475 | if (token & QTD_STS_DBE) | |
2476 | fotg210_dbg(fotg210, | |
2477 | "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n", | |
2478 | urb, | |
2479 | usb_endpoint_num(&urb->ep->desc), | |
2480 | usb_endpoint_dir_in(&urb->ep->desc) | |
2481 | ? "in" : "out", | |
2482 | urb->transfer_buffer_length, | |
2483 | qtd, | |
2484 | qh); | |
2485 | ||
2486 | /* on STALL, error, and short reads this urb must | |
2487 | * complete and all its qtds must be recycled. | |
2488 | */ | |
2489 | if ((token & QTD_STS_HALT) != 0) { | |
2490 | ||
2491 | /* retry transaction errors until we | |
2492 | * reach the software xacterr limit | |
2493 | */ | |
2494 | if ((token & QTD_STS_XACT) && | |
2495 | QTD_CERR(token) == 0 && | |
2496 | ++qh->xacterrs < QH_XACTERR_MAX && | |
2497 | !urb->unlinked) { | |
2498 | fotg210_dbg(fotg210, | |
2499 | "detected XactErr len %zu/%zu retry %d\n", | |
2500 | qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs); | |
2501 | ||
2502 | /* reset the token in the qtd and the | |
2503 | * qh overlay (which still contains | |
2504 | * the qtd) so that we pick up from | |
2505 | * where we left off | |
2506 | */ | |
2507 | token &= ~QTD_STS_HALT; | |
2508 | token |= QTD_STS_ACTIVE | | |
2509 | (FOTG210_TUNE_CERR << 10); | |
2510 | qtd->hw_token = cpu_to_hc32(fotg210, | |
2511 | token); | |
2512 | wmb(); | |
2513 | hw->hw_token = cpu_to_hc32(fotg210, | |
2514 | token); | |
2515 | goto retry_xacterr; | |
2516 | } | |
2517 | stopped = 1; | |
2518 | ||
2519 | /* magic dummy for some short reads; qh won't advance. | |
2520 | * that silicon quirk can kick in with this dummy too. | |
2521 | * | |
2522 | * other short reads won't stop the queue, including | |
2523 | * control transfers (status stage handles that) or | |
2524 | * most other single-qtd reads ... the queue stops if | |
2525 | * URB_SHORT_NOT_OK was set so the driver submitting | |
2526 | * the urbs could clean it up. | |
2527 | */ | |
2528 | } else if (IS_SHORT_READ(token) | |
2529 | && !(qtd->hw_alt_next | |
2530 | & FOTG210_LIST_END(fotg210))) { | |
2531 | stopped = 1; | |
2532 | } | |
2533 | ||
2534 | /* stop scanning when we reach qtds the hc is using */ | |
2535 | } else if (likely(!stopped | |
2536 | && fotg210->rh_state >= FOTG210_RH_RUNNING)) { | |
2537 | break; | |
2538 | ||
2539 | /* scan the whole queue for unlinks whenever it stops */ | |
2540 | } else { | |
2541 | stopped = 1; | |
2542 | ||
2543 | /* cancel everything if we halt, suspend, etc */ | |
2544 | if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
2545 | last_status = -ESHUTDOWN; | |
2546 | ||
2547 | /* this qtd is active; skip it unless a previous qtd | |
2548 | * for its urb faulted, or its urb was canceled. | |
2549 | */ | |
2550 | else if (last_status == -EINPROGRESS && !urb->unlinked) | |
2551 | continue; | |
2552 | ||
2553 | /* qh unlinked; token in overlay may be most current */ | |
2554 | if (state == QH_STATE_IDLE | |
2555 | && cpu_to_hc32(fotg210, qtd->qtd_dma) | |
2556 | == hw->hw_current) { | |
2557 | token = hc32_to_cpu(fotg210, hw->hw_token); | |
2558 | ||
2559 | /* An unlink may leave an incomplete | |
2560 | * async transaction in the TT buffer. | |
2561 | * We have to clear it. | |
2562 | */ | |
2563 | fotg210_clear_tt_buffer(fotg210, qh, urb, | |
2564 | token); | |
2565 | } | |
2566 | } | |
2567 | ||
2568 | /* unless we already know the urb's status, collect qtd status | |
2569 | * and update count of bytes transferred. in common short read | |
2570 | * cases with only one data qtd (including control transfers), | |
2571 | * queue processing won't halt. but with two or more qtds (for | |
2572 | * example, with a 32 KB transfer), when the first qtd gets a | |
2573 | * short read the second must be removed by hand. | |
2574 | */ | |
2575 | if (last_status == -EINPROGRESS) { | |
2576 | last_status = qtd_copy_status(fotg210, urb, | |
2577 | qtd->length, token); | |
2578 | if (last_status == -EREMOTEIO | |
2579 | && (qtd->hw_alt_next | |
2580 | & FOTG210_LIST_END(fotg210))) | |
2581 | last_status = -EINPROGRESS; | |
2582 | ||
2583 | /* As part of low/full-speed endpoint-halt processing | |
2584 | * we must clear the TT buffer (11.17.5). | |
2585 | */ | |
2586 | if (unlikely(last_status != -EINPROGRESS && | |
2587 | last_status != -EREMOTEIO)) { | |
2588 | /* The TT's in some hubs malfunction when they | |
2589 | * receive this request following a STALL (they | |
2590 | * stop sending isochronous packets). Since a | |
2591 | * STALL can't leave the TT buffer in a busy | |
2592 | * state (if you believe Figures 11-48 - 11-51 | |
2593 | * in the USB 2.0 spec), we won't clear the TT | |
2594 | * buffer in this case. Strictly speaking this | |
2595 | * is a violation of the spec. | |
2596 | */ | |
2597 | if (last_status != -EPIPE) | |
2598 | fotg210_clear_tt_buffer(fotg210, qh, | |
2599 | urb, token); | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | /* if we're removing something not at the queue head, | |
2604 | * patch the hardware queue pointer. | |
2605 | */ | |
2606 | if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { | |
2607 | last = list_entry(qtd->qtd_list.prev, | |
2608 | struct fotg210_qtd, qtd_list); | |
2609 | last->hw_next = qtd->hw_next; | |
2610 | } | |
2611 | ||
2612 | /* remove qtd; it's recycled after possible urb completion */ | |
2613 | list_del(&qtd->qtd_list); | |
2614 | last = qtd; | |
2615 | ||
2616 | /* reinit the xacterr counter for the next qtd */ | |
2617 | qh->xacterrs = 0; | |
2618 | } | |
2619 | ||
2620 | /* last urb's completion might still need calling */ | |
2621 | if (likely(last != NULL)) { | |
2622 | fotg210_urb_done(fotg210, last->urb, last_status); | |
2623 | count++; | |
2624 | fotg210_qtd_free(fotg210, last); | |
2625 | } | |
2626 | ||
2627 | /* Do we need to rescan for URBs dequeued during a giveback? */ | |
2628 | if (unlikely(qh->needs_rescan)) { | |
2629 | /* If the QH is already unlinked, do the rescan now. */ | |
2630 | if (state == QH_STATE_IDLE) | |
2631 | goto rescan; | |
2632 | ||
2633 | /* Otherwise we have to wait until the QH is fully unlinked. | |
2634 | * Our caller will start an unlink if qh->needs_rescan is | |
2635 | * set. But if an unlink has already started, nothing needs | |
2636 | * to be done. | |
2637 | */ | |
2638 | if (state != QH_STATE_LINKED) | |
2639 | qh->needs_rescan = 0; | |
2640 | } | |
2641 | ||
2642 | /* restore original state; caller must unlink or relink */ | |
2643 | qh->qh_state = state; | |
2644 | ||
2645 | /* be sure the hardware's done with the qh before refreshing | |
2646 | * it after fault cleanup, or recovering from silicon wrongly | |
2647 | * overlaying the dummy qtd (which reduces DMA chatter). | |
2648 | */ | |
2649 | if (stopped != 0 || hw->hw_qtd_next == FOTG210_LIST_END(fotg210)) { | |
2650 | switch (state) { | |
2651 | case QH_STATE_IDLE: | |
2652 | qh_refresh(fotg210, qh); | |
2653 | break; | |
2654 | case QH_STATE_LINKED: | |
2655 | /* We won't refresh a QH that's linked (after the HC | |
2656 | * stopped the queue). That avoids a race: | |
2657 | * - HC reads first part of QH; | |
2658 | * - CPU updates that first part and the token; | |
2659 | * - HC reads rest of that QH, including token | |
2660 | * Result: HC gets an inconsistent image, and then | |
2661 | * DMAs to/from the wrong memory (corrupting it). | |
2662 | * | |
2663 | * That should be rare for interrupt transfers, | |
2664 | * except maybe high bandwidth ... | |
2665 | */ | |
2666 | ||
2667 | /* Tell the caller to start an unlink */ | |
2668 | qh->needs_rescan = 1; | |
2669 | break; | |
2670 | /* otherwise, unlink already started */ | |
2671 | } | |
2672 | } | |
2673 | ||
2674 | return count; | |
2675 | } | |
2676 | ||
2677 | /*-------------------------------------------------------------------------*/ | |
2678 | ||
2679 | /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ | |
2680 | #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) | |
2681 | /* ... and packet size, for any kind of endpoint descriptor */ | |
2682 | #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) | |
2683 | ||
2684 | /* | |
2685 | * reverse of qh_urb_transaction: free a list of TDs. | |
2686 | * used for cleanup after errors, before HC sees an URB's TDs. | |
2687 | */ | |
2688 | static void qtd_list_free( | |
2689 | struct fotg210_hcd *fotg210, | |
2690 | struct urb *urb, | |
2691 | struct list_head *qtd_list | |
2692 | ) { | |
2693 | struct list_head *entry, *temp; | |
2694 | ||
2695 | list_for_each_safe(entry, temp, qtd_list) { | |
2696 | struct fotg210_qtd *qtd; | |
2697 | ||
2698 | qtd = list_entry(entry, struct fotg210_qtd, qtd_list); | |
2699 | list_del(&qtd->qtd_list); | |
2700 | fotg210_qtd_free(fotg210, qtd); | |
2701 | } | |
2702 | } | |
2703 | ||
2704 | /* | |
2705 | * create a list of filled qtds for this URB; won't link into qh. | |
2706 | */ | |
2707 | static struct list_head * | |
2708 | qh_urb_transaction( | |
2709 | struct fotg210_hcd *fotg210, | |
2710 | struct urb *urb, | |
2711 | struct list_head *head, | |
2712 | gfp_t flags | |
2713 | ) { | |
2714 | struct fotg210_qtd *qtd, *qtd_prev; | |
2715 | dma_addr_t buf; | |
2716 | int len, this_sg_len, maxpacket; | |
2717 | int is_input; | |
2718 | u32 token; | |
2719 | int i; | |
2720 | struct scatterlist *sg; | |
2721 | ||
2722 | /* | |
2723 | * URBs map to sequences of QTDs: one logical transaction | |
2724 | */ | |
2725 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2726 | if (unlikely(!qtd)) | |
2727 | return NULL; | |
2728 | list_add_tail(&qtd->qtd_list, head); | |
2729 | qtd->urb = urb; | |
2730 | ||
2731 | token = QTD_STS_ACTIVE; | |
2732 | token |= (FOTG210_TUNE_CERR << 10); | |
2733 | /* for split transactions, SplitXState initialized to zero */ | |
2734 | ||
2735 | len = urb->transfer_buffer_length; | |
2736 | is_input = usb_pipein(urb->pipe); | |
2737 | if (usb_pipecontrol(urb->pipe)) { | |
2738 | /* SETUP pid */ | |
2739 | qtd_fill(fotg210, qtd, urb->setup_dma, | |
2740 | sizeof(struct usb_ctrlrequest), | |
2741 | token | (2 /* "setup" */ << 8), 8); | |
2742 | ||
2743 | /* ... and always at least one more pid */ | |
2744 | token ^= QTD_TOGGLE; | |
2745 | qtd_prev = qtd; | |
2746 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2747 | if (unlikely(!qtd)) | |
2748 | goto cleanup; | |
2749 | qtd->urb = urb; | |
2750 | qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2751 | list_add_tail(&qtd->qtd_list, head); | |
2752 | ||
2753 | /* for zero length DATA stages, STATUS is always IN */ | |
2754 | if (len == 0) | |
2755 | token |= (1 /* "in" */ << 8); | |
2756 | } | |
2757 | ||
2758 | /* | |
2759 | * data transfer stage: buffer setup | |
2760 | */ | |
2761 | i = urb->num_mapped_sgs; | |
2762 | if (len > 0 && i > 0) { | |
2763 | sg = urb->sg; | |
2764 | buf = sg_dma_address(sg); | |
2765 | ||
2766 | /* urb->transfer_buffer_length may be smaller than the | |
2767 | * size of the scatterlist (or vice versa) | |
2768 | */ | |
2769 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
2770 | } else { | |
2771 | sg = NULL; | |
2772 | buf = urb->transfer_dma; | |
2773 | this_sg_len = len; | |
2774 | } | |
2775 | ||
2776 | if (is_input) | |
2777 | token |= (1 /* "in" */ << 8); | |
2778 | /* else it's already initted to "out" pid (0 << 8) */ | |
2779 | ||
2780 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); | |
2781 | ||
2782 | /* | |
2783 | * buffer gets wrapped in one or more qtds; | |
2784 | * last one may be "short" (including zero len) | |
2785 | * and may serve as a control status ack | |
2786 | */ | |
2787 | for (;;) { | |
2788 | int this_qtd_len; | |
2789 | ||
2790 | this_qtd_len = qtd_fill(fotg210, qtd, buf, this_sg_len, token, | |
2791 | maxpacket); | |
2792 | this_sg_len -= this_qtd_len; | |
2793 | len -= this_qtd_len; | |
2794 | buf += this_qtd_len; | |
2795 | ||
2796 | /* | |
2797 | * short reads advance to a "magic" dummy instead of the next | |
2798 | * qtd ... that forces the queue to stop, for manual cleanup. | |
2799 | * (this will usually be overridden later.) | |
2800 | */ | |
2801 | if (is_input) | |
2802 | qtd->hw_alt_next = fotg210->async->hw->hw_alt_next; | |
2803 | ||
2804 | /* qh makes control packets use qtd toggle; maybe switch it */ | |
2805 | if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) | |
2806 | token ^= QTD_TOGGLE; | |
2807 | ||
2808 | if (likely(this_sg_len <= 0)) { | |
2809 | if (--i <= 0 || len <= 0) | |
2810 | break; | |
2811 | sg = sg_next(sg); | |
2812 | buf = sg_dma_address(sg); | |
2813 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
2814 | } | |
2815 | ||
2816 | qtd_prev = qtd; | |
2817 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2818 | if (unlikely(!qtd)) | |
2819 | goto cleanup; | |
2820 | qtd->urb = urb; | |
2821 | qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2822 | list_add_tail(&qtd->qtd_list, head); | |
2823 | } | |
2824 | ||
2825 | /* | |
2826 | * unless the caller requires manual cleanup after short reads, | |
2827 | * have the alt_next mechanism keep the queue running after the | |
2828 | * last data qtd (the only one, for control and most other cases). | |
2829 | */ | |
2830 | if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 | |
2831 | || usb_pipecontrol(urb->pipe))) | |
2832 | qtd->hw_alt_next = FOTG210_LIST_END(fotg210); | |
2833 | ||
2834 | /* | |
2835 | * control requests may need a terminating data "status" ack; | |
2836 | * other OUT ones may need a terminating short packet | |
2837 | * (zero length). | |
2838 | */ | |
2839 | if (likely(urb->transfer_buffer_length != 0)) { | |
2840 | int one_more = 0; | |
2841 | ||
2842 | if (usb_pipecontrol(urb->pipe)) { | |
2843 | one_more = 1; | |
2844 | token ^= 0x0100; /* "in" <--> "out" */ | |
2845 | token |= QTD_TOGGLE; /* force DATA1 */ | |
2846 | } else if (usb_pipeout(urb->pipe) | |
2847 | && (urb->transfer_flags & URB_ZERO_PACKET) | |
2848 | && !(urb->transfer_buffer_length % maxpacket)) { | |
2849 | one_more = 1; | |
2850 | } | |
2851 | if (one_more) { | |
2852 | qtd_prev = qtd; | |
2853 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2854 | if (unlikely(!qtd)) | |
2855 | goto cleanup; | |
2856 | qtd->urb = urb; | |
2857 | qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2858 | list_add_tail(&qtd->qtd_list, head); | |
2859 | ||
2860 | /* never any data in such packets */ | |
2861 | qtd_fill(fotg210, qtd, 0, 0, token, 0); | |
2862 | } | |
2863 | } | |
2864 | ||
2865 | /* by default, enable interrupt on urb completion */ | |
2866 | if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT))) | |
2867 | qtd->hw_token |= cpu_to_hc32(fotg210, QTD_IOC); | |
2868 | return head; | |
2869 | ||
2870 | cleanup: | |
2871 | qtd_list_free(fotg210, urb, head); | |
2872 | return NULL; | |
2873 | } | |
2874 | ||
2875 | /*-------------------------------------------------------------------------*/ | |
2876 | /* | |
2877 | * Would be best to create all qh's from config descriptors, | |
2878 | * when each interface/altsetting is established. Unlink | |
2879 | * any previous qh and cancel its urbs first; endpoints are | |
2880 | * implicitly reset then (data toggle too). | |
2881 | * That'd mean updating how usbcore talks to HCDs. (2.7?) | |
2882 | */ | |
2883 | ||
2884 | ||
2885 | /* | |
2886 | * Each QH holds a qtd list; a QH is used for everything except iso. | |
2887 | * | |
2888 | * For interrupt urbs, the scheduler must set the microframe scheduling | |
2889 | * mask(s) each time the QH gets scheduled. For highspeed, that's | |
2890 | * just one microframe in the s-mask. For split interrupt transactions | |
2891 | * there are additional complications: c-mask, maybe FSTNs. | |
2892 | */ | |
2893 | static struct fotg210_qh * | |
2894 | qh_make( | |
2895 | struct fotg210_hcd *fotg210, | |
2896 | struct urb *urb, | |
2897 | gfp_t flags | |
2898 | ) { | |
2899 | struct fotg210_qh *qh = fotg210_qh_alloc(fotg210, flags); | |
2900 | u32 info1 = 0, info2 = 0; | |
2901 | int is_input, type; | |
2902 | int maxp = 0; | |
2903 | struct usb_tt *tt = urb->dev->tt; | |
2904 | struct fotg210_qh_hw *hw; | |
2905 | ||
2906 | if (!qh) | |
2907 | return qh; | |
2908 | ||
2909 | /* | |
2910 | * init endpoint/device data for this QH | |
2911 | */ | |
2912 | info1 |= usb_pipeendpoint(urb->pipe) << 8; | |
2913 | info1 |= usb_pipedevice(urb->pipe) << 0; | |
2914 | ||
2915 | is_input = usb_pipein(urb->pipe); | |
2916 | type = usb_pipetype(urb->pipe); | |
2917 | maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input); | |
2918 | ||
2919 | /* 1024 byte maxpacket is a hardware ceiling. High bandwidth | |
2920 | * acts like up to 3KB, but is built from smaller packets. | |
2921 | */ | |
2922 | if (max_packet(maxp) > 1024) { | |
2923 | fotg210_dbg(fotg210, "bogus qh maxpacket %d\n", | |
2924 | max_packet(maxp)); | |
2925 | goto done; | |
2926 | } | |
2927 | ||
2928 | /* Compute interrupt scheduling parameters just once, and save. | |
2929 | * - allowing for high bandwidth, how many nsec/uframe are used? | |
2930 | * - split transactions need a second CSPLIT uframe; same question | |
2931 | * - splits also need a schedule gap (for full/low speed I/O) | |
2932 | * - qh has a polling interval | |
2933 | * | |
2934 | * For control/bulk requests, the HC or TT handles these. | |
2935 | */ | |
2936 | if (type == PIPE_INTERRUPT) { | |
2937 | qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH, | |
2938 | is_input, 0, | |
2939 | hb_mult(maxp) * max_packet(maxp))); | |
2940 | qh->start = NO_FRAME; | |
2941 | ||
2942 | if (urb->dev->speed == USB_SPEED_HIGH) { | |
2943 | qh->c_usecs = 0; | |
2944 | qh->gap_uf = 0; | |
2945 | ||
2946 | qh->period = urb->interval >> 3; | |
2947 | if (qh->period == 0 && urb->interval != 1) { | |
2948 | /* NOTE interval 2 or 4 uframes could work. | |
2949 | * But interval 1 scheduling is simpler, and | |
2950 | * includes high bandwidth. | |
2951 | */ | |
2952 | urb->interval = 1; | |
2953 | } else if (qh->period > fotg210->periodic_size) { | |
2954 | qh->period = fotg210->periodic_size; | |
2955 | urb->interval = qh->period << 3; | |
2956 | } | |
2957 | } else { | |
2958 | int think_time; | |
2959 | ||
2960 | /* gap is f(FS/LS transfer times) */ | |
2961 | qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed, | |
2962 | is_input, 0, maxp) / (125 * 1000); | |
2963 | ||
2964 | /* FIXME this just approximates SPLIT/CSPLIT times */ | |
2965 | if (is_input) { /* SPLIT, gap, CSPLIT+DATA */ | |
2966 | qh->c_usecs = qh->usecs + HS_USECS(0); | |
2967 | qh->usecs = HS_USECS(1); | |
2968 | } else { /* SPLIT+DATA, gap, CSPLIT */ | |
2969 | qh->usecs += HS_USECS(1); | |
2970 | qh->c_usecs = HS_USECS(0); | |
2971 | } | |
2972 | ||
2973 | think_time = tt ? tt->think_time : 0; | |
2974 | qh->tt_usecs = NS_TO_US(think_time + | |
2975 | usb_calc_bus_time(urb->dev->speed, | |
2976 | is_input, 0, max_packet(maxp))); | |
2977 | qh->period = urb->interval; | |
2978 | if (qh->period > fotg210->periodic_size) { | |
2979 | qh->period = fotg210->periodic_size; | |
2980 | urb->interval = qh->period; | |
2981 | } | |
2982 | } | |
2983 | } | |
2984 | ||
2985 | /* support for tt scheduling, and access to toggles */ | |
2986 | qh->dev = urb->dev; | |
2987 | ||
2988 | /* using TT? */ | |
2989 | switch (urb->dev->speed) { | |
2990 | case USB_SPEED_LOW: | |
2991 | info1 |= QH_LOW_SPEED; | |
2992 | /* FALL THROUGH */ | |
2993 | ||
2994 | case USB_SPEED_FULL: | |
2995 | /* EPS 0 means "full" */ | |
2996 | if (type != PIPE_INTERRUPT) | |
2997 | info1 |= (FOTG210_TUNE_RL_TT << 28); | |
2998 | if (type == PIPE_CONTROL) { | |
2999 | info1 |= QH_CONTROL_EP; /* for TT */ | |
3000 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ | |
3001 | } | |
3002 | info1 |= maxp << 16; | |
3003 | ||
3004 | info2 |= (FOTG210_TUNE_MULT_TT << 30); | |
3005 | ||
3006 | /* Some Freescale processors have an erratum in which the | |
3007 | * port number in the queue head was 0..N-1 instead of 1..N. | |
3008 | */ | |
3009 | if (fotg210_has_fsl_portno_bug(fotg210)) | |
3010 | info2 |= (urb->dev->ttport-1) << 23; | |
3011 | else | |
3012 | info2 |= urb->dev->ttport << 23; | |
3013 | ||
3014 | /* set the address of the TT; for TDI's integrated | |
3015 | * root hub tt, leave it zeroed. | |
3016 | */ | |
3017 | if (tt && tt->hub != fotg210_to_hcd(fotg210)->self.root_hub) | |
3018 | info2 |= tt->hub->devnum << 16; | |
3019 | ||
3020 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ | |
3021 | ||
3022 | break; | |
3023 | ||
3024 | case USB_SPEED_HIGH: /* no TT involved */ | |
3025 | info1 |= QH_HIGH_SPEED; | |
3026 | if (type == PIPE_CONTROL) { | |
3027 | info1 |= (FOTG210_TUNE_RL_HS << 28); | |
3028 | info1 |= 64 << 16; /* usb2 fixed maxpacket */ | |
3029 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ | |
3030 | info2 |= (FOTG210_TUNE_MULT_HS << 30); | |
3031 | } else if (type == PIPE_BULK) { | |
3032 | info1 |= (FOTG210_TUNE_RL_HS << 28); | |
3033 | /* The USB spec says that high speed bulk endpoints | |
3034 | * always use 512 byte maxpacket. But some device | |
3035 | * vendors decided to ignore that, and MSFT is happy | |
3036 | * to help them do so. So now people expect to use | |
3037 | * such nonconformant devices with Linux too; sigh. | |
3038 | */ | |
3039 | info1 |= max_packet(maxp) << 16; | |
3040 | info2 |= (FOTG210_TUNE_MULT_HS << 30); | |
3041 | } else { /* PIPE_INTERRUPT */ | |
3042 | info1 |= max_packet(maxp) << 16; | |
3043 | info2 |= hb_mult(maxp) << 30; | |
3044 | } | |
3045 | break; | |
3046 | default: | |
3047 | fotg210_dbg(fotg210, "bogus dev %p speed %d\n", urb->dev, | |
3048 | urb->dev->speed); | |
3049 | done: | |
3050 | qh_destroy(fotg210, qh); | |
3051 | return NULL; | |
3052 | } | |
3053 | ||
3054 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ | |
3055 | ||
3056 | /* init as live, toggle clear, advance to dummy */ | |
3057 | qh->qh_state = QH_STATE_IDLE; | |
3058 | hw = qh->hw; | |
3059 | hw->hw_info1 = cpu_to_hc32(fotg210, info1); | |
3060 | hw->hw_info2 = cpu_to_hc32(fotg210, info2); | |
3061 | qh->is_out = !is_input; | |
3062 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1); | |
3063 | qh_refresh(fotg210, qh); | |
3064 | return qh; | |
3065 | } | |
3066 | ||
3067 | /*-------------------------------------------------------------------------*/ | |
3068 | ||
3069 | static void enable_async(struct fotg210_hcd *fotg210) | |
3070 | { | |
3071 | if (fotg210->async_count++) | |
3072 | return; | |
3073 | ||
3074 | /* Stop waiting to turn off the async schedule */ | |
3075 | fotg210->enabled_hrtimer_events &= ~BIT(FOTG210_HRTIMER_DISABLE_ASYNC); | |
3076 | ||
3077 | /* Don't start the schedule until ASS is 0 */ | |
3078 | fotg210_poll_ASS(fotg210); | |
3079 | turn_on_io_watchdog(fotg210); | |
3080 | } | |
3081 | ||
3082 | static void disable_async(struct fotg210_hcd *fotg210) | |
3083 | { | |
3084 | if (--fotg210->async_count) | |
3085 | return; | |
3086 | ||
3087 | /* The async schedule and async_unlink list are supposed to be empty */ | |
3088 | WARN_ON(fotg210->async->qh_next.qh || fotg210->async_unlink); | |
3089 | ||
3090 | /* Don't turn off the schedule until ASS is 1 */ | |
3091 | fotg210_poll_ASS(fotg210); | |
3092 | } | |
3093 | ||
3094 | /* move qh (and its qtds) onto async queue; maybe enable queue. */ | |
3095 | ||
3096 | static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3097 | { | |
3098 | __hc32 dma = QH_NEXT(fotg210, qh->qh_dma); | |
3099 | struct fotg210_qh *head; | |
3100 | ||
3101 | /* Don't link a QH if there's a Clear-TT-Buffer pending */ | |
3102 | if (unlikely(qh->clearing_tt)) | |
3103 | return; | |
3104 | ||
3105 | WARN_ON(qh->qh_state != QH_STATE_IDLE); | |
3106 | ||
3107 | /* clear halt and/or toggle; and maybe recover from silicon quirk */ | |
3108 | qh_refresh(fotg210, qh); | |
3109 | ||
3110 | /* splice right after start */ | |
3111 | head = fotg210->async; | |
3112 | qh->qh_next = head->qh_next; | |
3113 | qh->hw->hw_next = head->hw->hw_next; | |
3114 | wmb(); | |
3115 | ||
3116 | head->qh_next.qh = qh; | |
3117 | head->hw->hw_next = dma; | |
3118 | ||
3119 | qh->xacterrs = 0; | |
3120 | qh->qh_state = QH_STATE_LINKED; | |
3121 | /* qtd completions reported later by interrupt */ | |
3122 | ||
3123 | enable_async(fotg210); | |
3124 | } | |
3125 | ||
3126 | /*-------------------------------------------------------------------------*/ | |
3127 | ||
3128 | /* | |
3129 | * For control/bulk/interrupt, return QH with these TDs appended. | |
3130 | * Allocates and initializes the QH if necessary. | |
3131 | * Returns null if it can't allocate a QH it needs to. | |
3132 | * If the QH has TDs (urbs) already, that's great. | |
3133 | */ | |
3134 | static struct fotg210_qh *qh_append_tds( | |
3135 | struct fotg210_hcd *fotg210, | |
3136 | struct urb *urb, | |
3137 | struct list_head *qtd_list, | |
3138 | int epnum, | |
3139 | void **ptr | |
3140 | ) | |
3141 | { | |
3142 | struct fotg210_qh *qh = NULL; | |
3143 | __hc32 qh_addr_mask = cpu_to_hc32(fotg210, 0x7f); | |
3144 | ||
3145 | qh = (struct fotg210_qh *) *ptr; | |
3146 | if (unlikely(qh == NULL)) { | |
3147 | /* can't sleep here, we have fotg210->lock... */ | |
3148 | qh = qh_make(fotg210, urb, GFP_ATOMIC); | |
3149 | *ptr = qh; | |
3150 | } | |
3151 | if (likely(qh != NULL)) { | |
3152 | struct fotg210_qtd *qtd; | |
3153 | ||
3154 | if (unlikely(list_empty(qtd_list))) | |
3155 | qtd = NULL; | |
3156 | else | |
3157 | qtd = list_entry(qtd_list->next, struct fotg210_qtd, | |
3158 | qtd_list); | |
3159 | ||
3160 | /* control qh may need patching ... */ | |
3161 | if (unlikely(epnum == 0)) { | |
3162 | /* usb_reset_device() briefly reverts to address 0 */ | |
3163 | if (usb_pipedevice(urb->pipe) == 0) | |
3164 | qh->hw->hw_info1 &= ~qh_addr_mask; | |
3165 | } | |
3166 | ||
3167 | /* just one way to queue requests: swap with the dummy qtd. | |
3168 | * only hc or qh_refresh() ever modify the overlay. | |
3169 | */ | |
3170 | if (likely(qtd != NULL)) { | |
3171 | struct fotg210_qtd *dummy; | |
3172 | dma_addr_t dma; | |
3173 | __hc32 token; | |
3174 | ||
3175 | /* to avoid racing the HC, use the dummy td instead of | |
3176 | * the first td of our list (becomes new dummy). both | |
3177 | * tds stay deactivated until we're done, when the | |
3178 | * HC is allowed to fetch the old dummy (4.10.2). | |
3179 | */ | |
3180 | token = qtd->hw_token; | |
3181 | qtd->hw_token = HALT_BIT(fotg210); | |
3182 | ||
3183 | dummy = qh->dummy; | |
3184 | ||
3185 | dma = dummy->qtd_dma; | |
3186 | *dummy = *qtd; | |
3187 | dummy->qtd_dma = dma; | |
3188 | ||
3189 | list_del(&qtd->qtd_list); | |
3190 | list_add(&dummy->qtd_list, qtd_list); | |
3191 | list_splice_tail(qtd_list, &qh->qtd_list); | |
3192 | ||
3193 | fotg210_qtd_init(fotg210, qtd, qtd->qtd_dma); | |
3194 | qh->dummy = qtd; | |
3195 | ||
3196 | /* hc must see the new dummy at list end */ | |
3197 | dma = qtd->qtd_dma; | |
3198 | qtd = list_entry(qh->qtd_list.prev, | |
3199 | struct fotg210_qtd, qtd_list); | |
3200 | qtd->hw_next = QTD_NEXT(fotg210, dma); | |
3201 | ||
3202 | /* let the hc process these next qtds */ | |
3203 | wmb(); | |
3204 | dummy->hw_token = token; | |
3205 | ||
3206 | urb->hcpriv = qh; | |
3207 | } | |
3208 | } | |
3209 | return qh; | |
3210 | } | |
3211 | ||
3212 | /*-------------------------------------------------------------------------*/ | |
3213 | ||
3214 | static int | |
3215 | submit_async( | |
3216 | struct fotg210_hcd *fotg210, | |
3217 | struct urb *urb, | |
3218 | struct list_head *qtd_list, | |
3219 | gfp_t mem_flags | |
3220 | ) { | |
3221 | int epnum; | |
3222 | unsigned long flags; | |
3223 | struct fotg210_qh *qh = NULL; | |
3224 | int rc; | |
3225 | ||
3226 | epnum = urb->ep->desc.bEndpointAddress; | |
3227 | ||
3228 | #ifdef FOTG210_URB_TRACE | |
3229 | { | |
3230 | struct fotg210_qtd *qtd; | |
3231 | qtd = list_entry(qtd_list->next, struct fotg210_qtd, qtd_list); | |
3232 | fotg210_dbg(fotg210, | |
3233 | "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", | |
3234 | __func__, urb->dev->devpath, urb, | |
3235 | epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", | |
3236 | urb->transfer_buffer_length, | |
3237 | qtd, urb->ep->hcpriv); | |
3238 | } | |
3239 | #endif | |
3240 | ||
3241 | spin_lock_irqsave(&fotg210->lock, flags); | |
3242 | if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { | |
3243 | rc = -ESHUTDOWN; | |
3244 | goto done; | |
3245 | } | |
3246 | rc = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); | |
3247 | if (unlikely(rc)) | |
3248 | goto done; | |
3249 | ||
3250 | qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv); | |
3251 | if (unlikely(qh == NULL)) { | |
3252 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
3253 | rc = -ENOMEM; | |
3254 | goto done; | |
3255 | } | |
3256 | ||
3257 | /* Control/bulk operations through TTs don't need scheduling, | |
3258 | * the HC and TT handle it when the TT has a buffer ready. | |
3259 | */ | |
3260 | if (likely(qh->qh_state == QH_STATE_IDLE)) | |
3261 | qh_link_async(fotg210, qh); | |
3262 | done: | |
3263 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
3264 | if (unlikely(qh == NULL)) | |
3265 | qtd_list_free(fotg210, urb, qtd_list); | |
3266 | return rc; | |
3267 | } | |
3268 | ||
3269 | /*-------------------------------------------------------------------------*/ | |
3270 | ||
3271 | static void single_unlink_async(struct fotg210_hcd *fotg210, | |
3272 | struct fotg210_qh *qh) | |
3273 | { | |
3274 | struct fotg210_qh *prev; | |
3275 | ||
3276 | /* Add to the end of the list of QHs waiting for the next IAAD */ | |
3277 | qh->qh_state = QH_STATE_UNLINK; | |
3278 | if (fotg210->async_unlink) | |
3279 | fotg210->async_unlink_last->unlink_next = qh; | |
3280 | else | |
3281 | fotg210->async_unlink = qh; | |
3282 | fotg210->async_unlink_last = qh; | |
3283 | ||
3284 | /* Unlink it from the schedule */ | |
3285 | prev = fotg210->async; | |
3286 | while (prev->qh_next.qh != qh) | |
3287 | prev = prev->qh_next.qh; | |
3288 | ||
3289 | prev->hw->hw_next = qh->hw->hw_next; | |
3290 | prev->qh_next = qh->qh_next; | |
3291 | if (fotg210->qh_scan_next == qh) | |
3292 | fotg210->qh_scan_next = qh->qh_next.qh; | |
3293 | } | |
3294 | ||
3295 | static void start_iaa_cycle(struct fotg210_hcd *fotg210, bool nested) | |
3296 | { | |
3297 | /* | |
3298 | * Do nothing if an IAA cycle is already running or | |
3299 | * if one will be started shortly. | |
3300 | */ | |
3301 | if (fotg210->async_iaa || fotg210->async_unlinking) | |
3302 | return; | |
3303 | ||
3304 | /* Do all the waiting QHs at once */ | |
3305 | fotg210->async_iaa = fotg210->async_unlink; | |
3306 | fotg210->async_unlink = NULL; | |
3307 | ||
3308 | /* If the controller isn't running, we don't have to wait for it */ | |
3309 | if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) { | |
3310 | if (!nested) /* Avoid recursion */ | |
3311 | end_unlink_async(fotg210); | |
3312 | ||
3313 | /* Otherwise start a new IAA cycle */ | |
3314 | } else if (likely(fotg210->rh_state == FOTG210_RH_RUNNING)) { | |
3315 | /* Make sure the unlinks are all visible to the hardware */ | |
3316 | wmb(); | |
3317 | ||
3318 | fotg210_writel(fotg210, fotg210->command | CMD_IAAD, | |
3319 | &fotg210->regs->command); | |
3320 | fotg210_readl(fotg210, &fotg210->regs->command); | |
3321 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_IAA_WATCHDOG, | |
3322 | true); | |
3323 | } | |
3324 | } | |
3325 | ||
3326 | /* the async qh for the qtds being unlinked are now gone from the HC */ | |
3327 | ||
3328 | static void end_unlink_async(struct fotg210_hcd *fotg210) | |
3329 | { | |
3330 | struct fotg210_qh *qh; | |
3331 | ||
3332 | /* Process the idle QHs */ | |
3333 | restart: | |
3334 | fotg210->async_unlinking = true; | |
3335 | while (fotg210->async_iaa) { | |
3336 | qh = fotg210->async_iaa; | |
3337 | fotg210->async_iaa = qh->unlink_next; | |
3338 | qh->unlink_next = NULL; | |
3339 | ||
3340 | qh->qh_state = QH_STATE_IDLE; | |
3341 | qh->qh_next.qh = NULL; | |
3342 | ||
3343 | qh_completions(fotg210, qh); | |
3344 | if (!list_empty(&qh->qtd_list) && | |
3345 | fotg210->rh_state == FOTG210_RH_RUNNING) | |
3346 | qh_link_async(fotg210, qh); | |
3347 | disable_async(fotg210); | |
3348 | } | |
3349 | fotg210->async_unlinking = false; | |
3350 | ||
3351 | /* Start a new IAA cycle if any QHs are waiting for it */ | |
3352 | if (fotg210->async_unlink) { | |
3353 | start_iaa_cycle(fotg210, true); | |
3354 | if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) | |
3355 | goto restart; | |
3356 | } | |
3357 | } | |
3358 | ||
3359 | static void unlink_empty_async(struct fotg210_hcd *fotg210) | |
3360 | { | |
3361 | struct fotg210_qh *qh, *next; | |
3362 | bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING); | |
3363 | bool check_unlinks_later = false; | |
3364 | ||
3365 | /* Unlink all the async QHs that have been empty for a timer cycle */ | |
3366 | next = fotg210->async->qh_next.qh; | |
3367 | while (next) { | |
3368 | qh = next; | |
3369 | next = qh->qh_next.qh; | |
3370 | ||
3371 | if (list_empty(&qh->qtd_list) && | |
3372 | qh->qh_state == QH_STATE_LINKED) { | |
3373 | if (!stopped && qh->unlink_cycle == | |
3374 | fotg210->async_unlink_cycle) | |
3375 | check_unlinks_later = true; | |
3376 | else | |
3377 | single_unlink_async(fotg210, qh); | |
3378 | } | |
3379 | } | |
3380 | ||
3381 | /* Start a new IAA cycle if any QHs are waiting for it */ | |
3382 | if (fotg210->async_unlink) | |
3383 | start_iaa_cycle(fotg210, false); | |
3384 | ||
3385 | /* QHs that haven't been empty for long enough will be handled later */ | |
3386 | if (check_unlinks_later) { | |
3387 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_ASYNC_UNLINKS, | |
3388 | true); | |
3389 | ++fotg210->async_unlink_cycle; | |
3390 | } | |
3391 | } | |
3392 | ||
3393 | /* makes sure the async qh will become idle */ | |
3394 | /* caller must own fotg210->lock */ | |
3395 | ||
3396 | static void start_unlink_async(struct fotg210_hcd *fotg210, | |
3397 | struct fotg210_qh *qh) | |
3398 | { | |
3399 | /* | |
3400 | * If the QH isn't linked then there's nothing we can do | |
3401 | * unless we were called during a giveback, in which case | |
3402 | * qh_completions() has to deal with it. | |
3403 | */ | |
3404 | if (qh->qh_state != QH_STATE_LINKED) { | |
3405 | if (qh->qh_state == QH_STATE_COMPLETING) | |
3406 | qh->needs_rescan = 1; | |
3407 | return; | |
3408 | } | |
3409 | ||
3410 | single_unlink_async(fotg210, qh); | |
3411 | start_iaa_cycle(fotg210, false); | |
3412 | } | |
3413 | ||
3414 | /*-------------------------------------------------------------------------*/ | |
3415 | ||
3416 | static void scan_async(struct fotg210_hcd *fotg210) | |
3417 | { | |
3418 | struct fotg210_qh *qh; | |
3419 | bool check_unlinks_later = false; | |
3420 | ||
3421 | fotg210->qh_scan_next = fotg210->async->qh_next.qh; | |
3422 | while (fotg210->qh_scan_next) { | |
3423 | qh = fotg210->qh_scan_next; | |
3424 | fotg210->qh_scan_next = qh->qh_next.qh; | |
3425 | rescan: | |
3426 | /* clean any finished work for this qh */ | |
3427 | if (!list_empty(&qh->qtd_list)) { | |
3428 | int temp; | |
3429 | ||
3430 | /* | |
3431 | * Unlinks could happen here; completion reporting | |
3432 | * drops the lock. That's why fotg210->qh_scan_next | |
3433 | * always holds the next qh to scan; if the next qh | |
3434 | * gets unlinked then fotg210->qh_scan_next is adjusted | |
3435 | * in single_unlink_async(). | |
3436 | */ | |
3437 | temp = qh_completions(fotg210, qh); | |
3438 | if (qh->needs_rescan) { | |
3439 | start_unlink_async(fotg210, qh); | |
3440 | } else if (list_empty(&qh->qtd_list) | |
3441 | && qh->qh_state == QH_STATE_LINKED) { | |
3442 | qh->unlink_cycle = fotg210->async_unlink_cycle; | |
3443 | check_unlinks_later = true; | |
3444 | } else if (temp != 0) | |
3445 | goto rescan; | |
3446 | } | |
3447 | } | |
3448 | ||
3449 | /* | |
3450 | * Unlink empty entries, reducing DMA usage as well | |
3451 | * as HCD schedule-scanning costs. Delay for any qh | |
3452 | * we just scanned, there's a not-unusual case that it | |
3453 | * doesn't stay idle for long. | |
3454 | */ | |
3455 | if (check_unlinks_later && fotg210->rh_state == FOTG210_RH_RUNNING && | |
3456 | !(fotg210->enabled_hrtimer_events & | |
3457 | BIT(FOTG210_HRTIMER_ASYNC_UNLINKS))) { | |
3458 | fotg210_enable_event(fotg210, | |
3459 | FOTG210_HRTIMER_ASYNC_UNLINKS, true); | |
3460 | ++fotg210->async_unlink_cycle; | |
3461 | } | |
3462 | } | |
3463 | /*-------------------------------------------------------------------------*/ | |
3464 | /* | |
3465 | * EHCI scheduled transaction support: interrupt, iso, split iso | |
3466 | * These are called "periodic" transactions in the EHCI spec. | |
3467 | * | |
3468 | * Note that for interrupt transfers, the QH/QTD manipulation is shared | |
3469 | * with the "asynchronous" transaction support (control/bulk transfers). | |
3470 | * The only real difference is in how interrupt transfers are scheduled. | |
3471 | * | |
3472 | * For ISO, we make an "iso_stream" head to serve the same role as a QH. | |
3473 | * It keeps track of every ITD (or SITD) that's linked, and holds enough | |
3474 | * pre-calculated schedule data to make appending to the queue be quick. | |
3475 | */ | |
3476 | ||
3477 | static int fotg210_get_frame(struct usb_hcd *hcd); | |
3478 | ||
3479 | /*-------------------------------------------------------------------------*/ | |
3480 | ||
3481 | /* | |
3482 | * periodic_next_shadow - return "next" pointer on shadow list | |
3483 | * @periodic: host pointer to qh/itd | |
3484 | * @tag: hardware tag for type of this record | |
3485 | */ | |
3486 | static union fotg210_shadow * | |
3487 | periodic_next_shadow(struct fotg210_hcd *fotg210, | |
3488 | union fotg210_shadow *periodic, __hc32 tag) | |
3489 | { | |
3490 | switch (hc32_to_cpu(fotg210, tag)) { | |
3491 | case Q_TYPE_QH: | |
3492 | return &periodic->qh->qh_next; | |
3493 | case Q_TYPE_FSTN: | |
3494 | return &periodic->fstn->fstn_next; | |
3495 | default: | |
3496 | return &periodic->itd->itd_next; | |
3497 | } | |
3498 | } | |
3499 | ||
3500 | static __hc32 * | |
3501 | shadow_next_periodic(struct fotg210_hcd *fotg210, | |
3502 | union fotg210_shadow *periodic, __hc32 tag) | |
3503 | { | |
3504 | switch (hc32_to_cpu(fotg210, tag)) { | |
3505 | /* our fotg210_shadow.qh is actually software part */ | |
3506 | case Q_TYPE_QH: | |
3507 | return &periodic->qh->hw->hw_next; | |
3508 | /* others are hw parts */ | |
3509 | default: | |
3510 | return periodic->hw_next; | |
3511 | } | |
3512 | } | |
3513 | ||
3514 | /* caller must hold fotg210->lock */ | |
3515 | static void periodic_unlink(struct fotg210_hcd *fotg210, unsigned frame, | |
3516 | void *ptr) | |
3517 | { | |
3518 | union fotg210_shadow *prev_p = &fotg210->pshadow[frame]; | |
3519 | __hc32 *hw_p = &fotg210->periodic[frame]; | |
3520 | union fotg210_shadow here = *prev_p; | |
3521 | ||
3522 | /* find predecessor of "ptr"; hw and shadow lists are in sync */ | |
3523 | while (here.ptr && here.ptr != ptr) { | |
3524 | prev_p = periodic_next_shadow(fotg210, prev_p, | |
3525 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3526 | hw_p = shadow_next_periodic(fotg210, &here, | |
3527 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3528 | here = *prev_p; | |
3529 | } | |
3530 | /* an interrupt entry (at list end) could have been shared */ | |
3531 | if (!here.ptr) | |
3532 | return; | |
3533 | ||
3534 | /* update shadow and hardware lists ... the old "next" pointers | |
3535 | * from ptr may still be in use, the caller updates them. | |
3536 | */ | |
3537 | *prev_p = *periodic_next_shadow(fotg210, &here, | |
3538 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3539 | ||
3540 | *hw_p = *shadow_next_periodic(fotg210, &here, | |
3541 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3542 | } | |
3543 | ||
3544 | /* how many of the uframe's 125 usecs are allocated? */ | |
3545 | static unsigned short | |
3546 | periodic_usecs(struct fotg210_hcd *fotg210, unsigned frame, unsigned uframe) | |
3547 | { | |
3548 | __hc32 *hw_p = &fotg210->periodic[frame]; | |
3549 | union fotg210_shadow *q = &fotg210->pshadow[frame]; | |
3550 | unsigned usecs = 0; | |
3551 | struct fotg210_qh_hw *hw; | |
3552 | ||
3553 | while (q->ptr) { | |
3554 | switch (hc32_to_cpu(fotg210, Q_NEXT_TYPE(fotg210, *hw_p))) { | |
3555 | case Q_TYPE_QH: | |
3556 | hw = q->qh->hw; | |
3557 | /* is it in the S-mask? */ | |
3558 | if (hw->hw_info2 & cpu_to_hc32(fotg210, 1 << uframe)) | |
3559 | usecs += q->qh->usecs; | |
3560 | /* ... or C-mask? */ | |
3561 | if (hw->hw_info2 & cpu_to_hc32(fotg210, | |
3562 | 1 << (8 + uframe))) | |
3563 | usecs += q->qh->c_usecs; | |
3564 | hw_p = &hw->hw_next; | |
3565 | q = &q->qh->qh_next; | |
3566 | break; | |
3567 | /* case Q_TYPE_FSTN: */ | |
3568 | default: | |
3569 | /* for "save place" FSTNs, count the relevant INTR | |
3570 | * bandwidth from the previous frame | |
3571 | */ | |
3572 | if (q->fstn->hw_prev != FOTG210_LIST_END(fotg210)) | |
3573 | fotg210_dbg(fotg210, "ignoring FSTN cost ...\n"); | |
3574 | ||
3575 | hw_p = &q->fstn->hw_next; | |
3576 | q = &q->fstn->fstn_next; | |
3577 | break; | |
3578 | case Q_TYPE_ITD: | |
3579 | if (q->itd->hw_transaction[uframe]) | |
3580 | usecs += q->itd->stream->usecs; | |
3581 | hw_p = &q->itd->hw_next; | |
3582 | q = &q->itd->itd_next; | |
3583 | break; | |
3584 | } | |
3585 | } | |
3586 | #ifdef DEBUG | |
3587 | if (usecs > fotg210->uframe_periodic_max) | |
3588 | fotg210_err(fotg210, "uframe %d sched overrun: %d usecs\n", | |
3589 | frame * 8 + uframe, usecs); | |
3590 | #endif | |
3591 | return usecs; | |
3592 | } | |
3593 | ||
3594 | /*-------------------------------------------------------------------------*/ | |
3595 | ||
3596 | static int same_tt(struct usb_device *dev1, struct usb_device *dev2) | |
3597 | { | |
3598 | if (!dev1->tt || !dev2->tt) | |
3599 | return 0; | |
3600 | if (dev1->tt != dev2->tt) | |
3601 | return 0; | |
3602 | if (dev1->tt->multi) | |
3603 | return dev1->ttport == dev2->ttport; | |
3604 | else | |
3605 | return 1; | |
3606 | } | |
3607 | ||
3608 | /* return true iff the device's transaction translator is available | |
3609 | * for a periodic transfer starting at the specified frame, using | |
3610 | * all the uframes in the mask. | |
3611 | */ | |
3612 | static int tt_no_collision( | |
3613 | struct fotg210_hcd *fotg210, | |
3614 | unsigned period, | |
3615 | struct usb_device *dev, | |
3616 | unsigned frame, | |
3617 | u32 uf_mask | |
3618 | ) | |
3619 | { | |
3620 | if (period == 0) /* error */ | |
3621 | return 0; | |
3622 | ||
3623 | /* note bandwidth wastage: split never follows csplit | |
3624 | * (different dev or endpoint) until the next uframe. | |
3625 | * calling convention doesn't make that distinction. | |
3626 | */ | |
3627 | for (; frame < fotg210->periodic_size; frame += period) { | |
3628 | union fotg210_shadow here; | |
3629 | __hc32 type; | |
3630 | struct fotg210_qh_hw *hw; | |
3631 | ||
3632 | here = fotg210->pshadow[frame]; | |
3633 | type = Q_NEXT_TYPE(fotg210, fotg210->periodic[frame]); | |
3634 | while (here.ptr) { | |
3635 | switch (hc32_to_cpu(fotg210, type)) { | |
3636 | case Q_TYPE_ITD: | |
3637 | type = Q_NEXT_TYPE(fotg210, here.itd->hw_next); | |
3638 | here = here.itd->itd_next; | |
3639 | continue; | |
3640 | case Q_TYPE_QH: | |
3641 | hw = here.qh->hw; | |
3642 | if (same_tt(dev, here.qh->dev)) { | |
3643 | u32 mask; | |
3644 | ||
3645 | mask = hc32_to_cpu(fotg210, | |
3646 | hw->hw_info2); | |
3647 | /* "knows" no gap is needed */ | |
3648 | mask |= mask >> 8; | |
3649 | if (mask & uf_mask) | |
3650 | break; | |
3651 | } | |
3652 | type = Q_NEXT_TYPE(fotg210, hw->hw_next); | |
3653 | here = here.qh->qh_next; | |
3654 | continue; | |
3655 | /* case Q_TYPE_FSTN: */ | |
3656 | default: | |
3657 | fotg210_dbg(fotg210, | |
3658 | "periodic frame %d bogus type %d\n", | |
3659 | frame, type); | |
3660 | } | |
3661 | ||
3662 | /* collision or error */ | |
3663 | return 0; | |
3664 | } | |
3665 | } | |
3666 | ||
3667 | /* no collision */ | |
3668 | return 1; | |
3669 | } | |
3670 | ||
3671 | /*-------------------------------------------------------------------------*/ | |
3672 | ||
3673 | static void enable_periodic(struct fotg210_hcd *fotg210) | |
3674 | { | |
3675 | if (fotg210->periodic_count++) | |
3676 | return; | |
3677 | ||
3678 | /* Stop waiting to turn off the periodic schedule */ | |
3679 | fotg210->enabled_hrtimer_events &= | |
3680 | ~BIT(FOTG210_HRTIMER_DISABLE_PERIODIC); | |
3681 | ||
3682 | /* Don't start the schedule until PSS is 0 */ | |
3683 | fotg210_poll_PSS(fotg210); | |
3684 | turn_on_io_watchdog(fotg210); | |
3685 | } | |
3686 | ||
3687 | static void disable_periodic(struct fotg210_hcd *fotg210) | |
3688 | { | |
3689 | if (--fotg210->periodic_count) | |
3690 | return; | |
3691 | ||
3692 | /* Don't turn off the schedule until PSS is 1 */ | |
3693 | fotg210_poll_PSS(fotg210); | |
3694 | } | |
3695 | ||
3696 | /*-------------------------------------------------------------------------*/ | |
3697 | ||
3698 | /* periodic schedule slots have iso tds (normal or split) first, then a | |
3699 | * sparse tree for active interrupt transfers. | |
3700 | * | |
3701 | * this just links in a qh; caller guarantees uframe masks are set right. | |
3702 | * no FSTN support (yet; fotg210 0.96+) | |
3703 | */ | |
3704 | static void qh_link_periodic(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3705 | { | |
3706 | unsigned i; | |
3707 | unsigned period = qh->period; | |
3708 | ||
3709 | dev_dbg(&qh->dev->dev, | |
3710 | "link qh%d-%04x/%p start %d [%d/%d us]\n", | |
3711 | period, hc32_to_cpup(fotg210, &qh->hw->hw_info2) | |
3712 | & (QH_CMASK | QH_SMASK), | |
3713 | qh, qh->start, qh->usecs, qh->c_usecs); | |
3714 | ||
3715 | /* high bandwidth, or otherwise every microframe */ | |
3716 | if (period == 0) | |
3717 | period = 1; | |
3718 | ||
3719 | for (i = qh->start; i < fotg210->periodic_size; i += period) { | |
3720 | union fotg210_shadow *prev = &fotg210->pshadow[i]; | |
3721 | __hc32 *hw_p = &fotg210->periodic[i]; | |
3722 | union fotg210_shadow here = *prev; | |
3723 | __hc32 type = 0; | |
3724 | ||
3725 | /* skip the iso nodes at list head */ | |
3726 | while (here.ptr) { | |
3727 | type = Q_NEXT_TYPE(fotg210, *hw_p); | |
3728 | if (type == cpu_to_hc32(fotg210, Q_TYPE_QH)) | |
3729 | break; | |
3730 | prev = periodic_next_shadow(fotg210, prev, type); | |
3731 | hw_p = shadow_next_periodic(fotg210, &here, type); | |
3732 | here = *prev; | |
3733 | } | |
3734 | ||
3735 | /* sorting each branch by period (slow-->fast) | |
3736 | * enables sharing interior tree nodes | |
3737 | */ | |
3738 | while (here.ptr && qh != here.qh) { | |
3739 | if (qh->period > here.qh->period) | |
3740 | break; | |
3741 | prev = &here.qh->qh_next; | |
3742 | hw_p = &here.qh->hw->hw_next; | |
3743 | here = *prev; | |
3744 | } | |
3745 | /* link in this qh, unless some earlier pass did that */ | |
3746 | if (qh != here.qh) { | |
3747 | qh->qh_next = here; | |
3748 | if (here.qh) | |
3749 | qh->hw->hw_next = *hw_p; | |
3750 | wmb(); | |
3751 | prev->qh = qh; | |
3752 | *hw_p = QH_NEXT(fotg210, qh->qh_dma); | |
3753 | } | |
3754 | } | |
3755 | qh->qh_state = QH_STATE_LINKED; | |
3756 | qh->xacterrs = 0; | |
3757 | ||
3758 | /* update per-qh bandwidth for usbfs */ | |
3759 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated += qh->period | |
3760 | ? ((qh->usecs + qh->c_usecs) / qh->period) | |
3761 | : (qh->usecs * 8); | |
3762 | ||
3763 | list_add(&qh->intr_node, &fotg210->intr_qh_list); | |
3764 | ||
3765 | /* maybe enable periodic schedule processing */ | |
3766 | ++fotg210->intr_count; | |
3767 | enable_periodic(fotg210); | |
3768 | } | |
3769 | ||
3770 | static void qh_unlink_periodic(struct fotg210_hcd *fotg210, | |
3771 | struct fotg210_qh *qh) | |
3772 | { | |
3773 | unsigned i; | |
3774 | unsigned period; | |
3775 | ||
3776 | /* | |
3777 | * If qh is for a low/full-speed device, simply unlinking it | |
3778 | * could interfere with an ongoing split transaction. To unlink | |
3779 | * it safely would require setting the QH_INACTIVATE bit and | |
3780 | * waiting at least one frame, as described in EHCI 4.12.2.5. | |
3781 | * | |
3782 | * We won't bother with any of this. Instead, we assume that the | |
3783 | * only reason for unlinking an interrupt QH while the current URB | |
3784 | * is still active is to dequeue all the URBs (flush the whole | |
3785 | * endpoint queue). | |
3786 | * | |
3787 | * If rebalancing the periodic schedule is ever implemented, this | |
3788 | * approach will no longer be valid. | |
3789 | */ | |
3790 | ||
3791 | /* high bandwidth, or otherwise part of every microframe */ | |
3792 | period = qh->period; | |
3793 | if (!period) | |
3794 | period = 1; | |
3795 | ||
3796 | for (i = qh->start; i < fotg210->periodic_size; i += period) | |
3797 | periodic_unlink(fotg210, i, qh); | |
3798 | ||
3799 | /* update per-qh bandwidth for usbfs */ | |
3800 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated -= qh->period | |
3801 | ? ((qh->usecs + qh->c_usecs) / qh->period) | |
3802 | : (qh->usecs * 8); | |
3803 | ||
3804 | dev_dbg(&qh->dev->dev, | |
3805 | "unlink qh%d-%04x/%p start %d [%d/%d us]\n", | |
3806 | qh->period, | |
3807 | hc32_to_cpup(fotg210, &qh->hw->hw_info2) & | |
3808 | (QH_CMASK | QH_SMASK), qh, qh->start, qh->usecs, qh->c_usecs); | |
3809 | ||
3810 | /* qh->qh_next still "live" to HC */ | |
3811 | qh->qh_state = QH_STATE_UNLINK; | |
3812 | qh->qh_next.ptr = NULL; | |
3813 | ||
3814 | if (fotg210->qh_scan_next == qh) | |
3815 | fotg210->qh_scan_next = list_entry(qh->intr_node.next, | |
3816 | struct fotg210_qh, intr_node); | |
3817 | list_del(&qh->intr_node); | |
3818 | } | |
3819 | ||
3820 | static void start_unlink_intr(struct fotg210_hcd *fotg210, | |
3821 | struct fotg210_qh *qh) | |
3822 | { | |
3823 | /* If the QH isn't linked then there's nothing we can do | |
3824 | * unless we were called during a giveback, in which case | |
3825 | * qh_completions() has to deal with it. | |
3826 | */ | |
3827 | if (qh->qh_state != QH_STATE_LINKED) { | |
3828 | if (qh->qh_state == QH_STATE_COMPLETING) | |
3829 | qh->needs_rescan = 1; | |
3830 | return; | |
3831 | } | |
3832 | ||
3833 | qh_unlink_periodic(fotg210, qh); | |
3834 | ||
3835 | /* Make sure the unlinks are visible before starting the timer */ | |
3836 | wmb(); | |
3837 | ||
3838 | /* | |
3839 | * The EHCI spec doesn't say how long it takes the controller to | |
3840 | * stop accessing an unlinked interrupt QH. The timer delay is | |
3841 | * 9 uframes; presumably that will be long enough. | |
3842 | */ | |
3843 | qh->unlink_cycle = fotg210->intr_unlink_cycle; | |
3844 | ||
3845 | /* New entries go at the end of the intr_unlink list */ | |
3846 | if (fotg210->intr_unlink) | |
3847 | fotg210->intr_unlink_last->unlink_next = qh; | |
3848 | else | |
3849 | fotg210->intr_unlink = qh; | |
3850 | fotg210->intr_unlink_last = qh; | |
3851 | ||
3852 | if (fotg210->intr_unlinking) | |
3853 | ; /* Avoid recursive calls */ | |
3854 | else if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
3855 | fotg210_handle_intr_unlinks(fotg210); | |
3856 | else if (fotg210->intr_unlink == qh) { | |
3857 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR, | |
3858 | true); | |
3859 | ++fotg210->intr_unlink_cycle; | |
3860 | } | |
3861 | } | |
3862 | ||
3863 | static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3864 | { | |
3865 | struct fotg210_qh_hw *hw = qh->hw; | |
3866 | int rc; | |
3867 | ||
3868 | qh->qh_state = QH_STATE_IDLE; | |
3869 | hw->hw_next = FOTG210_LIST_END(fotg210); | |
3870 | ||
3871 | qh_completions(fotg210, qh); | |
3872 | ||
3873 | /* reschedule QH iff another request is queued */ | |
3874 | if (!list_empty(&qh->qtd_list) && | |
3875 | fotg210->rh_state == FOTG210_RH_RUNNING) { | |
3876 | rc = qh_schedule(fotg210, qh); | |
3877 | ||
3878 | /* An error here likely indicates handshake failure | |
3879 | * or no space left in the schedule. Neither fault | |
3880 | * should happen often ... | |
3881 | * | |
3882 | * FIXME kill the now-dysfunctional queued urbs | |
3883 | */ | |
3884 | if (rc != 0) | |
3885 | fotg210_err(fotg210, "can't reschedule qh %p, err %d\n", | |
3886 | qh, rc); | |
3887 | } | |
3888 | ||
3889 | /* maybe turn off periodic schedule */ | |
3890 | --fotg210->intr_count; | |
3891 | disable_periodic(fotg210); | |
3892 | } | |
3893 | ||
3894 | /*-------------------------------------------------------------------------*/ | |
3895 | ||
3896 | static int check_period( | |
3897 | struct fotg210_hcd *fotg210, | |
3898 | unsigned frame, | |
3899 | unsigned uframe, | |
3900 | unsigned period, | |
3901 | unsigned usecs | |
3902 | ) { | |
3903 | int claimed; | |
3904 | ||
3905 | /* complete split running into next frame? | |
3906 | * given FSTN support, we could sometimes check... | |
3907 | */ | |
3908 | if (uframe >= 8) | |
3909 | return 0; | |
3910 | ||
3911 | /* convert "usecs we need" to "max already claimed" */ | |
3912 | usecs = fotg210->uframe_periodic_max - usecs; | |
3913 | ||
3914 | /* we "know" 2 and 4 uframe intervals were rejected; so | |
3915 | * for period 0, check _every_ microframe in the schedule. | |
3916 | */ | |
3917 | if (unlikely(period == 0)) { | |
3918 | do { | |
3919 | for (uframe = 0; uframe < 7; uframe++) { | |
3920 | claimed = periodic_usecs(fotg210, frame, | |
3921 | uframe); | |
3922 | if (claimed > usecs) | |
3923 | return 0; | |
3924 | } | |
3925 | } while ((frame += 1) < fotg210->periodic_size); | |
3926 | ||
3927 | /* just check the specified uframe, at that period */ | |
3928 | } else { | |
3929 | do { | |
3930 | claimed = periodic_usecs(fotg210, frame, uframe); | |
3931 | if (claimed > usecs) | |
3932 | return 0; | |
3933 | } while ((frame += period) < fotg210->periodic_size); | |
3934 | } | |
3935 | ||
3936 | /* success! */ | |
3937 | return 1; | |
3938 | } | |
3939 | ||
3940 | static int check_intr_schedule( | |
3941 | struct fotg210_hcd *fotg210, | |
3942 | unsigned frame, | |
3943 | unsigned uframe, | |
3944 | const struct fotg210_qh *qh, | |
3945 | __hc32 *c_maskp | |
3946 | ) | |
3947 | { | |
3948 | int retval = -ENOSPC; | |
3949 | u8 mask = 0; | |
3950 | ||
3951 | if (qh->c_usecs && uframe >= 6) /* FSTN territory? */ | |
3952 | goto done; | |
3953 | ||
3954 | if (!check_period(fotg210, frame, uframe, qh->period, qh->usecs)) | |
3955 | goto done; | |
3956 | if (!qh->c_usecs) { | |
3957 | retval = 0; | |
3958 | *c_maskp = 0; | |
3959 | goto done; | |
3960 | } | |
3961 | ||
3962 | /* Make sure this tt's buffer is also available for CSPLITs. | |
3963 | * We pessimize a bit; probably the typical full speed case | |
3964 | * doesn't need the second CSPLIT. | |
3965 | * | |
3966 | * NOTE: both SPLIT and CSPLIT could be checked in just | |
3967 | * one smart pass... | |
3968 | */ | |
3969 | mask = 0x03 << (uframe + qh->gap_uf); | |
3970 | *c_maskp = cpu_to_hc32(fotg210, mask << 8); | |
3971 | ||
3972 | mask |= 1 << uframe; | |
3973 | if (tt_no_collision(fotg210, qh->period, qh->dev, frame, mask)) { | |
3974 | if (!check_period(fotg210, frame, uframe + qh->gap_uf + 1, | |
3975 | qh->period, qh->c_usecs)) | |
3976 | goto done; | |
3977 | if (!check_period(fotg210, frame, uframe + qh->gap_uf, | |
3978 | qh->period, qh->c_usecs)) | |
3979 | goto done; | |
3980 | retval = 0; | |
3981 | } | |
3982 | done: | |
3983 | return retval; | |
3984 | } | |
3985 | ||
3986 | /* "first fit" scheduling policy used the first time through, | |
3987 | * or when the previous schedule slot can't be re-used. | |
3988 | */ | |
3989 | static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3990 | { | |
3991 | int status; | |
3992 | unsigned uframe; | |
3993 | __hc32 c_mask; | |
3994 | unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */ | |
3995 | struct fotg210_qh_hw *hw = qh->hw; | |
3996 | ||
3997 | qh_refresh(fotg210, qh); | |
3998 | hw->hw_next = FOTG210_LIST_END(fotg210); | |
3999 | frame = qh->start; | |
4000 | ||
4001 | /* reuse the previous schedule slots, if we can */ | |
4002 | if (frame < qh->period) { | |
4003 | uframe = ffs(hc32_to_cpup(fotg210, &hw->hw_info2) & QH_SMASK); | |
4004 | status = check_intr_schedule(fotg210, frame, --uframe, | |
4005 | qh, &c_mask); | |
4006 | } else { | |
4007 | uframe = 0; | |
4008 | c_mask = 0; | |
4009 | status = -ENOSPC; | |
4010 | } | |
4011 | ||
4012 | /* else scan the schedule to find a group of slots such that all | |
4013 | * uframes have enough periodic bandwidth available. | |
4014 | */ | |
4015 | if (status) { | |
4016 | /* "normal" case, uframing flexible except with splits */ | |
4017 | if (qh->period) { | |
4018 | int i; | |
4019 | ||
4020 | for (i = qh->period; status && i > 0; --i) { | |
4021 | frame = ++fotg210->random_frame % qh->period; | |
4022 | for (uframe = 0; uframe < 8; uframe++) { | |
4023 | status = check_intr_schedule(fotg210, | |
4024 | frame, uframe, qh, | |
4025 | &c_mask); | |
4026 | if (status == 0) | |
4027 | break; | |
4028 | } | |
4029 | } | |
4030 | ||
4031 | /* qh->period == 0 means every uframe */ | |
4032 | } else { | |
4033 | frame = 0; | |
4034 | status = check_intr_schedule(fotg210, 0, 0, qh, | |
4035 | &c_mask); | |
4036 | } | |
4037 | if (status) | |
4038 | goto done; | |
4039 | qh->start = frame; | |
4040 | ||
4041 | /* reset S-frame and (maybe) C-frame masks */ | |
4042 | hw->hw_info2 &= cpu_to_hc32(fotg210, ~(QH_CMASK | QH_SMASK)); | |
4043 | hw->hw_info2 |= qh->period | |
4044 | ? cpu_to_hc32(fotg210, 1 << uframe) | |
4045 | : cpu_to_hc32(fotg210, QH_SMASK); | |
4046 | hw->hw_info2 |= c_mask; | |
4047 | } else | |
4048 | fotg210_dbg(fotg210, "reused qh %p schedule\n", qh); | |
4049 | ||
4050 | /* stuff into the periodic schedule */ | |
4051 | qh_link_periodic(fotg210, qh); | |
4052 | done: | |
4053 | return status; | |
4054 | } | |
4055 | ||
4056 | static int intr_submit( | |
4057 | struct fotg210_hcd *fotg210, | |
4058 | struct urb *urb, | |
4059 | struct list_head *qtd_list, | |
4060 | gfp_t mem_flags | |
4061 | ) { | |
4062 | unsigned epnum; | |
4063 | unsigned long flags; | |
4064 | struct fotg210_qh *qh; | |
4065 | int status; | |
4066 | struct list_head empty; | |
4067 | ||
4068 | /* get endpoint and transfer/schedule data */ | |
4069 | epnum = urb->ep->desc.bEndpointAddress; | |
4070 | ||
4071 | spin_lock_irqsave(&fotg210->lock, flags); | |
4072 | ||
4073 | if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { | |
4074 | status = -ESHUTDOWN; | |
4075 | goto done_not_linked; | |
4076 | } | |
4077 | status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); | |
4078 | if (unlikely(status)) | |
4079 | goto done_not_linked; | |
4080 | ||
4081 | /* get qh and force any scheduling errors */ | |
4082 | INIT_LIST_HEAD(&empty); | |
4083 | qh = qh_append_tds(fotg210, urb, &empty, epnum, &urb->ep->hcpriv); | |
4084 | if (qh == NULL) { | |
4085 | status = -ENOMEM; | |
4086 | goto done; | |
4087 | } | |
4088 | if (qh->qh_state == QH_STATE_IDLE) { | |
4089 | status = qh_schedule(fotg210, qh); | |
4090 | if (status) | |
4091 | goto done; | |
4092 | } | |
4093 | ||
4094 | /* then queue the urb's tds to the qh */ | |
4095 | qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv); | |
4096 | BUG_ON(qh == NULL); | |
4097 | ||
4098 | /* ... update usbfs periodic stats */ | |
4099 | fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs++; | |
4100 | ||
4101 | done: | |
4102 | if (unlikely(status)) | |
4103 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
4104 | done_not_linked: | |
4105 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4106 | if (status) | |
4107 | qtd_list_free(fotg210, urb, qtd_list); | |
4108 | ||
4109 | return status; | |
4110 | } | |
4111 | ||
4112 | static void scan_intr(struct fotg210_hcd *fotg210) | |
4113 | { | |
4114 | struct fotg210_qh *qh; | |
4115 | ||
4116 | list_for_each_entry_safe(qh, fotg210->qh_scan_next, | |
4117 | &fotg210->intr_qh_list, intr_node) { | |
4118 | rescan: | |
4119 | /* clean any finished work for this qh */ | |
4120 | if (!list_empty(&qh->qtd_list)) { | |
4121 | int temp; | |
4122 | ||
4123 | /* | |
4124 | * Unlinks could happen here; completion reporting | |
4125 | * drops the lock. That's why fotg210->qh_scan_next | |
4126 | * always holds the next qh to scan; if the next qh | |
4127 | * gets unlinked then fotg210->qh_scan_next is adjusted | |
4128 | * in qh_unlink_periodic(). | |
4129 | */ | |
4130 | temp = qh_completions(fotg210, qh); | |
4131 | if (unlikely(qh->needs_rescan || | |
4132 | (list_empty(&qh->qtd_list) && | |
4133 | qh->qh_state == QH_STATE_LINKED))) | |
4134 | start_unlink_intr(fotg210, qh); | |
4135 | else if (temp != 0) | |
4136 | goto rescan; | |
4137 | } | |
4138 | } | |
4139 | } | |
4140 | ||
4141 | /*-------------------------------------------------------------------------*/ | |
4142 | ||
4143 | /* fotg210_iso_stream ops work with both ITD and SITD */ | |
4144 | ||
4145 | static struct fotg210_iso_stream * | |
4146 | iso_stream_alloc(gfp_t mem_flags) | |
4147 | { | |
4148 | struct fotg210_iso_stream *stream; | |
4149 | ||
4150 | stream = kzalloc(sizeof(*stream), mem_flags); | |
4151 | if (likely(stream != NULL)) { | |
4152 | INIT_LIST_HEAD(&stream->td_list); | |
4153 | INIT_LIST_HEAD(&stream->free_list); | |
4154 | stream->next_uframe = -1; | |
4155 | } | |
4156 | return stream; | |
4157 | } | |
4158 | ||
4159 | static void | |
4160 | iso_stream_init( | |
4161 | struct fotg210_hcd *fotg210, | |
4162 | struct fotg210_iso_stream *stream, | |
4163 | struct usb_device *dev, | |
4164 | int pipe, | |
4165 | unsigned interval | |
4166 | ) | |
4167 | { | |
4168 | u32 buf1; | |
4169 | unsigned epnum, maxp; | |
4170 | int is_input; | |
4171 | long bandwidth; | |
4172 | unsigned multi; | |
4173 | ||
4174 | /* | |
4175 | * this might be a "high bandwidth" highspeed endpoint, | |
4176 | * as encoded in the ep descriptor's wMaxPacket field | |
4177 | */ | |
4178 | epnum = usb_pipeendpoint(pipe); | |
4179 | is_input = usb_pipein(pipe) ? USB_DIR_IN : 0; | |
4180 | maxp = usb_maxpacket(dev, pipe, !is_input); | |
4181 | if (is_input) | |
4182 | buf1 = (1 << 11); | |
4183 | else | |
4184 | buf1 = 0; | |
4185 | ||
4186 | maxp = max_packet(maxp); | |
4187 | multi = hb_mult(maxp); | |
4188 | buf1 |= maxp; | |
4189 | maxp *= multi; | |
4190 | ||
4191 | stream->buf0 = cpu_to_hc32(fotg210, (epnum << 8) | dev->devnum); | |
4192 | stream->buf1 = cpu_to_hc32(fotg210, buf1); | |
4193 | stream->buf2 = cpu_to_hc32(fotg210, multi); | |
4194 | ||
4195 | /* usbfs wants to report the average usecs per frame tied up | |
4196 | * when transfers on this endpoint are scheduled ... | |
4197 | */ | |
4198 | if (dev->speed == USB_SPEED_FULL) { | |
4199 | interval <<= 3; | |
4200 | stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed, | |
4201 | is_input, 1, maxp)); | |
4202 | stream->usecs /= 8; | |
4203 | } else { | |
4204 | stream->highspeed = 1; | |
4205 | stream->usecs = HS_USECS_ISO(maxp); | |
4206 | } | |
4207 | bandwidth = stream->usecs * 8; | |
4208 | bandwidth /= interval; | |
4209 | ||
4210 | stream->bandwidth = bandwidth; | |
4211 | stream->udev = dev; | |
4212 | stream->bEndpointAddress = is_input | epnum; | |
4213 | stream->interval = interval; | |
4214 | stream->maxp = maxp; | |
4215 | } | |
4216 | ||
4217 | static struct fotg210_iso_stream * | |
4218 | iso_stream_find(struct fotg210_hcd *fotg210, struct urb *urb) | |
4219 | { | |
4220 | unsigned epnum; | |
4221 | struct fotg210_iso_stream *stream; | |
4222 | struct usb_host_endpoint *ep; | |
4223 | unsigned long flags; | |
4224 | ||
4225 | epnum = usb_pipeendpoint(urb->pipe); | |
4226 | if (usb_pipein(urb->pipe)) | |
4227 | ep = urb->dev->ep_in[epnum]; | |
4228 | else | |
4229 | ep = urb->dev->ep_out[epnum]; | |
4230 | ||
4231 | spin_lock_irqsave(&fotg210->lock, flags); | |
4232 | stream = ep->hcpriv; | |
4233 | ||
4234 | if (unlikely(stream == NULL)) { | |
4235 | stream = iso_stream_alloc(GFP_ATOMIC); | |
4236 | if (likely(stream != NULL)) { | |
4237 | ep->hcpriv = stream; | |
4238 | stream->ep = ep; | |
4239 | iso_stream_init(fotg210, stream, urb->dev, urb->pipe, | |
4240 | urb->interval); | |
4241 | } | |
4242 | ||
4243 | /* if dev->ep[epnum] is a QH, hw is set */ | |
4244 | } else if (unlikely(stream->hw != NULL)) { | |
4245 | fotg210_dbg(fotg210, "dev %s ep%d%s, not iso??\n", | |
4246 | urb->dev->devpath, epnum, | |
4247 | usb_pipein(urb->pipe) ? "in" : "out"); | |
4248 | stream = NULL; | |
4249 | } | |
4250 | ||
4251 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4252 | return stream; | |
4253 | } | |
4254 | ||
4255 | /*-------------------------------------------------------------------------*/ | |
4256 | ||
4257 | /* fotg210_iso_sched ops can be ITD-only or SITD-only */ | |
4258 | ||
4259 | static struct fotg210_iso_sched * | |
4260 | iso_sched_alloc(unsigned packets, gfp_t mem_flags) | |
4261 | { | |
4262 | struct fotg210_iso_sched *iso_sched; | |
4263 | int size = sizeof(*iso_sched); | |
4264 | ||
4265 | size += packets * sizeof(struct fotg210_iso_packet); | |
4266 | iso_sched = kzalloc(size, mem_flags); | |
4267 | if (likely(iso_sched != NULL)) | |
4268 | INIT_LIST_HEAD(&iso_sched->td_list); | |
4269 | ||
4270 | return iso_sched; | |
4271 | } | |
4272 | ||
4273 | static inline void | |
4274 | itd_sched_init( | |
4275 | struct fotg210_hcd *fotg210, | |
4276 | struct fotg210_iso_sched *iso_sched, | |
4277 | struct fotg210_iso_stream *stream, | |
4278 | struct urb *urb | |
4279 | ) | |
4280 | { | |
4281 | unsigned i; | |
4282 | dma_addr_t dma = urb->transfer_dma; | |
4283 | ||
4284 | /* how many uframes are needed for these transfers */ | |
4285 | iso_sched->span = urb->number_of_packets * stream->interval; | |
4286 | ||
4287 | /* figure out per-uframe itd fields that we'll need later | |
4288 | * when we fit new itds into the schedule. | |
4289 | */ | |
4290 | for (i = 0; i < urb->number_of_packets; i++) { | |
4291 | struct fotg210_iso_packet *uframe = &iso_sched->packet[i]; | |
4292 | unsigned length; | |
4293 | dma_addr_t buf; | |
4294 | u32 trans; | |
4295 | ||
4296 | length = urb->iso_frame_desc[i].length; | |
4297 | buf = dma + urb->iso_frame_desc[i].offset; | |
4298 | ||
4299 | trans = FOTG210_ISOC_ACTIVE; | |
4300 | trans |= buf & 0x0fff; | |
4301 | if (unlikely(((i + 1) == urb->number_of_packets)) | |
4302 | && !(urb->transfer_flags & URB_NO_INTERRUPT)) | |
4303 | trans |= FOTG210_ITD_IOC; | |
4304 | trans |= length << 16; | |
4305 | uframe->transaction = cpu_to_hc32(fotg210, trans); | |
4306 | ||
4307 | /* might need to cross a buffer page within a uframe */ | |
4308 | uframe->bufp = (buf & ~(u64)0x0fff); | |
4309 | buf += length; | |
4310 | if (unlikely((uframe->bufp != (buf & ~(u64)0x0fff)))) | |
4311 | uframe->cross = 1; | |
4312 | } | |
4313 | } | |
4314 | ||
4315 | static void | |
4316 | iso_sched_free( | |
4317 | struct fotg210_iso_stream *stream, | |
4318 | struct fotg210_iso_sched *iso_sched | |
4319 | ) | |
4320 | { | |
4321 | if (!iso_sched) | |
4322 | return; | |
4323 | /* caller must hold fotg210->lock!*/ | |
4324 | list_splice(&iso_sched->td_list, &stream->free_list); | |
4325 | kfree(iso_sched); | |
4326 | } | |
4327 | ||
4328 | static int | |
4329 | itd_urb_transaction( | |
4330 | struct fotg210_iso_stream *stream, | |
4331 | struct fotg210_hcd *fotg210, | |
4332 | struct urb *urb, | |
4333 | gfp_t mem_flags | |
4334 | ) | |
4335 | { | |
4336 | struct fotg210_itd *itd; | |
4337 | dma_addr_t itd_dma; | |
4338 | int i; | |
4339 | unsigned num_itds; | |
4340 | struct fotg210_iso_sched *sched; | |
4341 | unsigned long flags; | |
4342 | ||
4343 | sched = iso_sched_alloc(urb->number_of_packets, mem_flags); | |
4344 | if (unlikely(sched == NULL)) | |
4345 | return -ENOMEM; | |
4346 | ||
4347 | itd_sched_init(fotg210, sched, stream, urb); | |
4348 | ||
4349 | if (urb->interval < 8) | |
4350 | num_itds = 1 + (sched->span + 7) / 8; | |
4351 | else | |
4352 | num_itds = urb->number_of_packets; | |
4353 | ||
4354 | /* allocate/init ITDs */ | |
4355 | spin_lock_irqsave(&fotg210->lock, flags); | |
4356 | for (i = 0; i < num_itds; i++) { | |
4357 | ||
4358 | /* | |
4359 | * Use iTDs from the free list, but not iTDs that may | |
4360 | * still be in use by the hardware. | |
4361 | */ | |
4362 | if (likely(!list_empty(&stream->free_list))) { | |
4363 | itd = list_first_entry(&stream->free_list, | |
4364 | struct fotg210_itd, itd_list); | |
4365 | if (itd->frame == fotg210->now_frame) | |
4366 | goto alloc_itd; | |
4367 | list_del(&itd->itd_list); | |
4368 | itd_dma = itd->itd_dma; | |
4369 | } else { | |
4370 | alloc_itd: | |
4371 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4372 | itd = dma_pool_alloc(fotg210->itd_pool, mem_flags, | |
4373 | &itd_dma); | |
4374 | spin_lock_irqsave(&fotg210->lock, flags); | |
4375 | if (!itd) { | |
4376 | iso_sched_free(stream, sched); | |
4377 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4378 | return -ENOMEM; | |
4379 | } | |
4380 | } | |
4381 | ||
4382 | memset(itd, 0, sizeof(*itd)); | |
4383 | itd->itd_dma = itd_dma; | |
4384 | list_add(&itd->itd_list, &sched->td_list); | |
4385 | } | |
4386 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4387 | ||
4388 | /* temporarily store schedule info in hcpriv */ | |
4389 | urb->hcpriv = sched; | |
4390 | urb->error_count = 0; | |
4391 | return 0; | |
4392 | } | |
4393 | ||
4394 | /*-------------------------------------------------------------------------*/ | |
4395 | ||
4396 | static inline int | |
4397 | itd_slot_ok( | |
4398 | struct fotg210_hcd *fotg210, | |
4399 | u32 mod, | |
4400 | u32 uframe, | |
4401 | u8 usecs, | |
4402 | u32 period | |
4403 | ) | |
4404 | { | |
4405 | uframe %= period; | |
4406 | do { | |
4407 | /* can't commit more than uframe_periodic_max usec */ | |
4408 | if (periodic_usecs(fotg210, uframe >> 3, uframe & 0x7) | |
4409 | > (fotg210->uframe_periodic_max - usecs)) | |
4410 | return 0; | |
4411 | ||
4412 | /* we know urb->interval is 2^N uframes */ | |
4413 | uframe += period; | |
4414 | } while (uframe < mod); | |
4415 | return 1; | |
4416 | } | |
4417 | ||
4418 | /* | |
4419 | * This scheduler plans almost as far into the future as it has actual | |
4420 | * periodic schedule slots. (Affected by TUNE_FLS, which defaults to | |
4421 | * "as small as possible" to be cache-friendlier.) That limits the size | |
4422 | * transfers you can stream reliably; avoid more than 64 msec per urb. | |
4423 | * Also avoid queue depths of less than fotg210's worst irq latency (affected | |
4424 | * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter, | |
4425 | * and other factors); or more than about 230 msec total (for portability, | |
4426 | * given FOTG210_TUNE_FLS and the slop). Or, write a smarter scheduler! | |
4427 | */ | |
4428 | ||
4429 | #define SCHEDULE_SLOP 80 /* microframes */ | |
4430 | ||
4431 | static int | |
4432 | iso_stream_schedule( | |
4433 | struct fotg210_hcd *fotg210, | |
4434 | struct urb *urb, | |
4435 | struct fotg210_iso_stream *stream | |
4436 | ) | |
4437 | { | |
4438 | u32 now, next, start, period, span; | |
4439 | int status; | |
4440 | unsigned mod = fotg210->periodic_size << 3; | |
4441 | struct fotg210_iso_sched *sched = urb->hcpriv; | |
4442 | ||
4443 | period = urb->interval; | |
4444 | span = sched->span; | |
4445 | ||
4446 | if (span > mod - SCHEDULE_SLOP) { | |
4447 | fotg210_dbg(fotg210, "iso request %p too long\n", urb); | |
4448 | status = -EFBIG; | |
4449 | goto fail; | |
4450 | } | |
4451 | ||
4452 | now = fotg210_read_frame_index(fotg210) & (mod - 1); | |
4453 | ||
4454 | /* Typical case: reuse current schedule, stream is still active. | |
4455 | * Hopefully there are no gaps from the host falling behind | |
4456 | * (irq delays etc), but if there are we'll take the next | |
4457 | * slot in the schedule, implicitly assuming URB_ISO_ASAP. | |
4458 | */ | |
4459 | if (likely(!list_empty(&stream->td_list))) { | |
4460 | u32 excess; | |
4461 | ||
4462 | /* For high speed devices, allow scheduling within the | |
4463 | * isochronous scheduling threshold. For full speed devices | |
4464 | * and Intel PCI-based controllers, don't (work around for | |
4465 | * Intel ICH9 bug). | |
4466 | */ | |
4467 | if (!stream->highspeed && fotg210->fs_i_thresh) | |
4468 | next = now + fotg210->i_thresh; | |
4469 | else | |
4470 | next = now; | |
4471 | ||
4472 | /* Fell behind (by up to twice the slop amount)? | |
4473 | * We decide based on the time of the last currently-scheduled | |
4474 | * slot, not the time of the next available slot. | |
4475 | */ | |
4476 | excess = (stream->next_uframe - period - next) & (mod - 1); | |
4477 | if (excess >= mod - 2 * SCHEDULE_SLOP) | |
4478 | start = next + excess - mod + period * | |
4479 | DIV_ROUND_UP(mod - excess, period); | |
4480 | else | |
4481 | start = next + excess + period; | |
4482 | if (start - now >= mod) { | |
4483 | fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n", | |
4484 | urb, start - now - period, period, | |
4485 | mod); | |
4486 | status = -EFBIG; | |
4487 | goto fail; | |
4488 | } | |
4489 | } | |
4490 | ||
4491 | /* need to schedule; when's the next (u)frame we could start? | |
4492 | * this is bigger than fotg210->i_thresh allows; scheduling itself | |
4493 | * isn't free, the slop should handle reasonably slow cpus. it | |
4494 | * can also help high bandwidth if the dma and irq loads don't | |
4495 | * jump until after the queue is primed. | |
4496 | */ | |
4497 | else { | |
4498 | int done = 0; | |
4499 | start = SCHEDULE_SLOP + (now & ~0x07); | |
4500 | ||
4501 | /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */ | |
4502 | ||
4503 | /* find a uframe slot with enough bandwidth. | |
4504 | * Early uframes are more precious because full-speed | |
4505 | * iso IN transfers can't use late uframes, | |
4506 | * and therefore they should be allocated last. | |
4507 | */ | |
4508 | next = start; | |
4509 | start += period; | |
4510 | do { | |
4511 | start--; | |
4512 | /* check schedule: enough space? */ | |
4513 | if (itd_slot_ok(fotg210, mod, start, | |
4514 | stream->usecs, period)) | |
4515 | done = 1; | |
4516 | } while (start > next && !done); | |
4517 | ||
4518 | /* no room in the schedule */ | |
4519 | if (!done) { | |
4520 | fotg210_dbg(fotg210, "iso resched full %p (now %d max %d)\n", | |
4521 | urb, now, now + mod); | |
4522 | status = -ENOSPC; | |
4523 | goto fail; | |
4524 | } | |
4525 | } | |
4526 | ||
4527 | /* Tried to schedule too far into the future? */ | |
4528 | if (unlikely(start - now + span - period | |
4529 | >= mod - 2 * SCHEDULE_SLOP)) { | |
4530 | fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n", | |
4531 | urb, start - now, span - period, | |
4532 | mod - 2 * SCHEDULE_SLOP); | |
4533 | status = -EFBIG; | |
4534 | goto fail; | |
4535 | } | |
4536 | ||
4537 | stream->next_uframe = start & (mod - 1); | |
4538 | ||
4539 | /* report high speed start in uframes; full speed, in frames */ | |
4540 | urb->start_frame = stream->next_uframe; | |
4541 | if (!stream->highspeed) | |
4542 | urb->start_frame >>= 3; | |
4543 | ||
4544 | /* Make sure scan_isoc() sees these */ | |
4545 | if (fotg210->isoc_count == 0) | |
4546 | fotg210->next_frame = now >> 3; | |
4547 | return 0; | |
4548 | ||
4549 | fail: | |
4550 | iso_sched_free(stream, sched); | |
4551 | urb->hcpriv = NULL; | |
4552 | return status; | |
4553 | } | |
4554 | ||
4555 | /*-------------------------------------------------------------------------*/ | |
4556 | ||
4557 | static inline void | |
4558 | itd_init(struct fotg210_hcd *fotg210, struct fotg210_iso_stream *stream, | |
4559 | struct fotg210_itd *itd) | |
4560 | { | |
4561 | int i; | |
4562 | ||
4563 | /* it's been recently zeroed */ | |
4564 | itd->hw_next = FOTG210_LIST_END(fotg210); | |
4565 | itd->hw_bufp[0] = stream->buf0; | |
4566 | itd->hw_bufp[1] = stream->buf1; | |
4567 | itd->hw_bufp[2] = stream->buf2; | |
4568 | ||
4569 | for (i = 0; i < 8; i++) | |
4570 | itd->index[i] = -1; | |
4571 | ||
4572 | /* All other fields are filled when scheduling */ | |
4573 | } | |
4574 | ||
4575 | static inline void | |
4576 | itd_patch( | |
4577 | struct fotg210_hcd *fotg210, | |
4578 | struct fotg210_itd *itd, | |
4579 | struct fotg210_iso_sched *iso_sched, | |
4580 | unsigned index, | |
4581 | u16 uframe | |
4582 | ) | |
4583 | { | |
4584 | struct fotg210_iso_packet *uf = &iso_sched->packet[index]; | |
4585 | unsigned pg = itd->pg; | |
4586 | ||
4587 | uframe &= 0x07; | |
4588 | itd->index[uframe] = index; | |
4589 | ||
4590 | itd->hw_transaction[uframe] = uf->transaction; | |
4591 | itd->hw_transaction[uframe] |= cpu_to_hc32(fotg210, pg << 12); | |
4592 | itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, uf->bufp & ~(u32)0); | |
4593 | itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(uf->bufp >> 32)); | |
4594 | ||
4595 | /* iso_frame_desc[].offset must be strictly increasing */ | |
4596 | if (unlikely(uf->cross)) { | |
4597 | u64 bufp = uf->bufp + 4096; | |
4598 | ||
4599 | itd->pg = ++pg; | |
4600 | itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, bufp & ~(u32)0); | |
4601 | itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(bufp >> 32)); | |
4602 | } | |
4603 | } | |
4604 | ||
4605 | static inline void | |
4606 | itd_link(struct fotg210_hcd *fotg210, unsigned frame, struct fotg210_itd *itd) | |
4607 | { | |
4608 | union fotg210_shadow *prev = &fotg210->pshadow[frame]; | |
4609 | __hc32 *hw_p = &fotg210->periodic[frame]; | |
4610 | union fotg210_shadow here = *prev; | |
4611 | __hc32 type = 0; | |
4612 | ||
4613 | /* skip any iso nodes which might belong to previous microframes */ | |
4614 | while (here.ptr) { | |
4615 | type = Q_NEXT_TYPE(fotg210, *hw_p); | |
4616 | if (type == cpu_to_hc32(fotg210, Q_TYPE_QH)) | |
4617 | break; | |
4618 | prev = periodic_next_shadow(fotg210, prev, type); | |
4619 | hw_p = shadow_next_periodic(fotg210, &here, type); | |
4620 | here = *prev; | |
4621 | } | |
4622 | ||
4623 | itd->itd_next = here; | |
4624 | itd->hw_next = *hw_p; | |
4625 | prev->itd = itd; | |
4626 | itd->frame = frame; | |
4627 | wmb(); | |
4628 | *hw_p = cpu_to_hc32(fotg210, itd->itd_dma | Q_TYPE_ITD); | |
4629 | } | |
4630 | ||
4631 | /* fit urb's itds into the selected schedule slot; activate as needed */ | |
4632 | static void itd_link_urb( | |
4633 | struct fotg210_hcd *fotg210, | |
4634 | struct urb *urb, | |
4635 | unsigned mod, | |
4636 | struct fotg210_iso_stream *stream | |
4637 | ) | |
4638 | { | |
4639 | int packet; | |
4640 | unsigned next_uframe, uframe, frame; | |
4641 | struct fotg210_iso_sched *iso_sched = urb->hcpriv; | |
4642 | struct fotg210_itd *itd; | |
4643 | ||
4644 | next_uframe = stream->next_uframe & (mod - 1); | |
4645 | ||
4646 | if (unlikely(list_empty(&stream->td_list))) { | |
4647 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated | |
4648 | += stream->bandwidth; | |
4649 | fotg210_vdbg(fotg210, | |
4650 | "schedule devp %s ep%d%s-iso period %d start %d.%d\n", | |
4651 | urb->dev->devpath, stream->bEndpointAddress & 0x0f, | |
4652 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out", | |
4653 | urb->interval, | |
4654 | next_uframe >> 3, next_uframe & 0x7); | |
4655 | } | |
4656 | ||
4657 | /* fill iTDs uframe by uframe */ | |
4658 | for (packet = 0, itd = NULL; packet < urb->number_of_packets;) { | |
4659 | if (itd == NULL) { | |
4660 | /* ASSERT: we have all necessary itds */ | |
4661 | ||
4662 | /* ASSERT: no itds for this endpoint in this uframe */ | |
4663 | ||
4664 | itd = list_entry(iso_sched->td_list.next, | |
4665 | struct fotg210_itd, itd_list); | |
4666 | list_move_tail(&itd->itd_list, &stream->td_list); | |
4667 | itd->stream = stream; | |
4668 | itd->urb = urb; | |
4669 | itd_init(fotg210, stream, itd); | |
4670 | } | |
4671 | ||
4672 | uframe = next_uframe & 0x07; | |
4673 | frame = next_uframe >> 3; | |
4674 | ||
4675 | itd_patch(fotg210, itd, iso_sched, packet, uframe); | |
4676 | ||
4677 | next_uframe += stream->interval; | |
4678 | next_uframe &= mod - 1; | |
4679 | packet++; | |
4680 | ||
4681 | /* link completed itds into the schedule */ | |
4682 | if (((next_uframe >> 3) != frame) | |
4683 | || packet == urb->number_of_packets) { | |
4684 | itd_link(fotg210, frame & (fotg210->periodic_size - 1), | |
4685 | itd); | |
4686 | itd = NULL; | |
4687 | } | |
4688 | } | |
4689 | stream->next_uframe = next_uframe; | |
4690 | ||
4691 | /* don't need that schedule data any more */ | |
4692 | iso_sched_free(stream, iso_sched); | |
4693 | urb->hcpriv = NULL; | |
4694 | ||
4695 | ++fotg210->isoc_count; | |
4696 | enable_periodic(fotg210); | |
4697 | } | |
4698 | ||
4699 | #define ISO_ERRS (FOTG210_ISOC_BUF_ERR | FOTG210_ISOC_BABBLE |\ | |
4700 | FOTG210_ISOC_XACTERR) | |
4701 | ||
4702 | /* Process and recycle a completed ITD. Return true iff its urb completed, | |
4703 | * and hence its completion callback probably added things to the hardware | |
4704 | * schedule. | |
4705 | * | |
4706 | * Note that we carefully avoid recycling this descriptor until after any | |
4707 | * completion callback runs, so that it won't be reused quickly. That is, | |
4708 | * assuming (a) no more than two urbs per frame on this endpoint, and also | |
4709 | * (b) only this endpoint's completions submit URBs. It seems some silicon | |
4710 | * corrupts things if you reuse completed descriptors very quickly... | |
4711 | */ | |
4712 | static bool itd_complete(struct fotg210_hcd *fotg210, struct fotg210_itd *itd) | |
4713 | { | |
4714 | struct urb *urb = itd->urb; | |
4715 | struct usb_iso_packet_descriptor *desc; | |
4716 | u32 t; | |
4717 | unsigned uframe; | |
4718 | int urb_index = -1; | |
4719 | struct fotg210_iso_stream *stream = itd->stream; | |
4720 | struct usb_device *dev; | |
4721 | bool retval = false; | |
4722 | ||
4723 | /* for each uframe with a packet */ | |
4724 | for (uframe = 0; uframe < 8; uframe++) { | |
4725 | if (likely(itd->index[uframe] == -1)) | |
4726 | continue; | |
4727 | urb_index = itd->index[uframe]; | |
4728 | desc = &urb->iso_frame_desc[urb_index]; | |
4729 | ||
4730 | t = hc32_to_cpup(fotg210, &itd->hw_transaction[uframe]); | |
4731 | itd->hw_transaction[uframe] = 0; | |
4732 | ||
4733 | /* report transfer status */ | |
4734 | if (unlikely(t & ISO_ERRS)) { | |
4735 | urb->error_count++; | |
4736 | if (t & FOTG210_ISOC_BUF_ERR) | |
4737 | desc->status = usb_pipein(urb->pipe) | |
4738 | ? -ENOSR /* hc couldn't read */ | |
4739 | : -ECOMM; /* hc couldn't write */ | |
4740 | else if (t & FOTG210_ISOC_BABBLE) | |
4741 | desc->status = -EOVERFLOW; | |
4742 | else /* (t & FOTG210_ISOC_XACTERR) */ | |
4743 | desc->status = -EPROTO; | |
4744 | ||
4745 | /* HC need not update length with this error */ | |
4746 | if (!(t & FOTG210_ISOC_BABBLE)) { | |
4747 | desc->actual_length = | |
4748 | fotg210_itdlen(urb, desc, t); | |
4749 | urb->actual_length += desc->actual_length; | |
4750 | } | |
4751 | } else if (likely((t & FOTG210_ISOC_ACTIVE) == 0)) { | |
4752 | desc->status = 0; | |
4753 | desc->actual_length = fotg210_itdlen(urb, desc, t); | |
4754 | urb->actual_length += desc->actual_length; | |
4755 | } else { | |
4756 | /* URB was too late */ | |
4757 | desc->status = -EXDEV; | |
4758 | } | |
4759 | } | |
4760 | ||
4761 | /* handle completion now? */ | |
4762 | if (likely((urb_index + 1) != urb->number_of_packets)) | |
4763 | goto done; | |
4764 | ||
4765 | /* ASSERT: it's really the last itd for this urb | |
4766 | list_for_each_entry (itd, &stream->td_list, itd_list) | |
4767 | BUG_ON (itd->urb == urb); | |
4768 | */ | |
4769 | ||
4770 | /* give urb back to the driver; completion often (re)submits */ | |
4771 | dev = urb->dev; | |
4772 | fotg210_urb_done(fotg210, urb, 0); | |
4773 | retval = true; | |
4774 | urb = NULL; | |
4775 | ||
4776 | --fotg210->isoc_count; | |
4777 | disable_periodic(fotg210); | |
4778 | ||
4779 | if (unlikely(list_is_singular(&stream->td_list))) { | |
4780 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated | |
4781 | -= stream->bandwidth; | |
4782 | fotg210_vdbg(fotg210, | |
4783 | "deschedule devp %s ep%d%s-iso\n", | |
4784 | dev->devpath, stream->bEndpointAddress & 0x0f, | |
4785 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out"); | |
4786 | } | |
4787 | ||
4788 | done: | |
4789 | itd->urb = NULL; | |
4790 | ||
4791 | /* Add to the end of the free list for later reuse */ | |
4792 | list_move_tail(&itd->itd_list, &stream->free_list); | |
4793 | ||
4794 | /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */ | |
4795 | if (list_empty(&stream->td_list)) { | |
4796 | list_splice_tail_init(&stream->free_list, | |
4797 | &fotg210->cached_itd_list); | |
4798 | start_free_itds(fotg210); | |
4799 | } | |
4800 | ||
4801 | return retval; | |
4802 | } | |
4803 | ||
4804 | /*-------------------------------------------------------------------------*/ | |
4805 | ||
4806 | static int itd_submit(struct fotg210_hcd *fotg210, struct urb *urb, | |
4807 | gfp_t mem_flags) | |
4808 | { | |
4809 | int status = -EINVAL; | |
4810 | unsigned long flags; | |
4811 | struct fotg210_iso_stream *stream; | |
4812 | ||
4813 | /* Get iso_stream head */ | |
4814 | stream = iso_stream_find(fotg210, urb); | |
4815 | if (unlikely(stream == NULL)) { | |
4816 | fotg210_dbg(fotg210, "can't get iso stream\n"); | |
4817 | return -ENOMEM; | |
4818 | } | |
4819 | if (unlikely(urb->interval != stream->interval && | |
4820 | fotg210_port_speed(fotg210, 0) == | |
4821 | USB_PORT_STAT_HIGH_SPEED)) { | |
4822 | fotg210_dbg(fotg210, "can't change iso interval %d --> %d\n", | |
4823 | stream->interval, urb->interval); | |
4824 | goto done; | |
4825 | } | |
4826 | ||
4827 | #ifdef FOTG210_URB_TRACE | |
4828 | fotg210_dbg(fotg210, | |
4829 | "%s %s urb %p ep%d%s len %d, %d pkts %d uframes[%p]\n", | |
4830 | __func__, urb->dev->devpath, urb, | |
4831 | usb_pipeendpoint(urb->pipe), | |
4832 | usb_pipein(urb->pipe) ? "in" : "out", | |
4833 | urb->transfer_buffer_length, | |
4834 | urb->number_of_packets, urb->interval, | |
4835 | stream); | |
4836 | #endif | |
4837 | ||
4838 | /* allocate ITDs w/o locking anything */ | |
4839 | status = itd_urb_transaction(stream, fotg210, urb, mem_flags); | |
4840 | if (unlikely(status < 0)) { | |
4841 | fotg210_dbg(fotg210, "can't init itds\n"); | |
4842 | goto done; | |
4843 | } | |
4844 | ||
4845 | /* schedule ... need to lock */ | |
4846 | spin_lock_irqsave(&fotg210->lock, flags); | |
4847 | if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { | |
4848 | status = -ESHUTDOWN; | |
4849 | goto done_not_linked; | |
4850 | } | |
4851 | status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); | |
4852 | if (unlikely(status)) | |
4853 | goto done_not_linked; | |
4854 | status = iso_stream_schedule(fotg210, urb, stream); | |
4855 | if (likely(status == 0)) | |
4856 | itd_link_urb(fotg210, urb, fotg210->periodic_size << 3, stream); | |
4857 | else | |
4858 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
4859 | done_not_linked: | |
4860 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4861 | done: | |
4862 | return status; | |
4863 | } | |
4864 | ||
4865 | /*-------------------------------------------------------------------------*/ | |
4866 | ||
4867 | static void scan_isoc(struct fotg210_hcd *fotg210) | |
4868 | { | |
4869 | unsigned uf, now_frame, frame; | |
4870 | unsigned fmask = fotg210->periodic_size - 1; | |
4871 | bool modified, live; | |
4872 | ||
4873 | /* | |
4874 | * When running, scan from last scan point up to "now" | |
4875 | * else clean up by scanning everything that's left. | |
4876 | * Touches as few pages as possible: cache-friendly. | |
4877 | */ | |
4878 | if (fotg210->rh_state >= FOTG210_RH_RUNNING) { | |
4879 | uf = fotg210_read_frame_index(fotg210); | |
4880 | now_frame = (uf >> 3) & fmask; | |
4881 | live = true; | |
4882 | } else { | |
4883 | now_frame = (fotg210->next_frame - 1) & fmask; | |
4884 | live = false; | |
4885 | } | |
4886 | fotg210->now_frame = now_frame; | |
4887 | ||
4888 | frame = fotg210->next_frame; | |
4889 | for (;;) { | |
4890 | union fotg210_shadow q, *q_p; | |
4891 | __hc32 type, *hw_p; | |
4892 | ||
4893 | restart: | |
4894 | /* scan each element in frame's queue for completions */ | |
4895 | q_p = &fotg210->pshadow[frame]; | |
4896 | hw_p = &fotg210->periodic[frame]; | |
4897 | q.ptr = q_p->ptr; | |
4898 | type = Q_NEXT_TYPE(fotg210, *hw_p); | |
4899 | modified = false; | |
4900 | ||
4901 | while (q.ptr != NULL) { | |
4902 | switch (hc32_to_cpu(fotg210, type)) { | |
4903 | case Q_TYPE_ITD: | |
4904 | /* If this ITD is still active, leave it for | |
4905 | * later processing ... check the next entry. | |
4906 | * No need to check for activity unless the | |
4907 | * frame is current. | |
4908 | */ | |
4909 | if (frame == now_frame && live) { | |
4910 | rmb(); | |
4911 | for (uf = 0; uf < 8; uf++) { | |
4912 | if (q.itd->hw_transaction[uf] & | |
4913 | ITD_ACTIVE(fotg210)) | |
4914 | break; | |
4915 | } | |
4916 | if (uf < 8) { | |
4917 | q_p = &q.itd->itd_next; | |
4918 | hw_p = &q.itd->hw_next; | |
4919 | type = Q_NEXT_TYPE(fotg210, | |
4920 | q.itd->hw_next); | |
4921 | q = *q_p; | |
4922 | break; | |
4923 | } | |
4924 | } | |
4925 | ||
4926 | /* Take finished ITDs out of the schedule | |
4927 | * and process them: recycle, maybe report | |
4928 | * URB completion. HC won't cache the | |
4929 | * pointer for much longer, if at all. | |
4930 | */ | |
4931 | *q_p = q.itd->itd_next; | |
4932 | *hw_p = q.itd->hw_next; | |
4933 | type = Q_NEXT_TYPE(fotg210, q.itd->hw_next); | |
4934 | wmb(); | |
4935 | modified = itd_complete(fotg210, q.itd); | |
4936 | q = *q_p; | |
4937 | break; | |
4938 | default: | |
4939 | fotg210_dbg(fotg210, "corrupt type %d frame %d shadow %p\n", | |
4940 | type, frame, q.ptr); | |
4941 | /* FALL THROUGH */ | |
4942 | case Q_TYPE_QH: | |
4943 | case Q_TYPE_FSTN: | |
4944 | /* End of the iTDs and siTDs */ | |
4945 | q.ptr = NULL; | |
4946 | break; | |
4947 | } | |
4948 | ||
4949 | /* assume completion callbacks modify the queue */ | |
4950 | if (unlikely(modified && fotg210->isoc_count > 0)) | |
4951 | goto restart; | |
4952 | } | |
4953 | ||
4954 | /* Stop when we have reached the current frame */ | |
4955 | if (frame == now_frame) | |
4956 | break; | |
4957 | frame = (frame + 1) & fmask; | |
4958 | } | |
4959 | fotg210->next_frame = now_frame; | |
4960 | } | |
4961 | /*-------------------------------------------------------------------------*/ | |
4962 | /* | |
4963 | * Display / Set uframe_periodic_max | |
4964 | */ | |
4965 | static ssize_t show_uframe_periodic_max(struct device *dev, | |
4966 | struct device_attribute *attr, | |
4967 | char *buf) | |
4968 | { | |
4969 | struct fotg210_hcd *fotg210; | |
4970 | int n; | |
4971 | ||
4972 | fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev))); | |
4973 | n = scnprintf(buf, PAGE_SIZE, "%d\n", fotg210->uframe_periodic_max); | |
4974 | return n; | |
4975 | } | |
4976 | ||
4977 | ||
4978 | static ssize_t store_uframe_periodic_max(struct device *dev, | |
4979 | struct device_attribute *attr, | |
4980 | const char *buf, size_t count) | |
4981 | { | |
4982 | struct fotg210_hcd *fotg210; | |
4983 | unsigned uframe_periodic_max; | |
4984 | unsigned frame, uframe; | |
4985 | unsigned short allocated_max; | |
4986 | unsigned long flags; | |
4987 | ssize_t ret; | |
4988 | ||
4989 | fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev))); | |
4990 | if (kstrtouint(buf, 0, &uframe_periodic_max) < 0) | |
4991 | return -EINVAL; | |
4992 | ||
4993 | if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) { | |
4994 | fotg210_info(fotg210, "rejecting invalid request for uframe_periodic_max=%u\n", | |
4995 | uframe_periodic_max); | |
4996 | return -EINVAL; | |
4997 | } | |
4998 | ||
4999 | ret = -EINVAL; | |
5000 | ||
5001 | /* | |
5002 | * lock, so that our checking does not race with possible periodic | |
5003 | * bandwidth allocation through submitting new urbs. | |
5004 | */ | |
5005 | spin_lock_irqsave(&fotg210->lock, flags); | |
5006 | ||
5007 | /* | |
5008 | * for request to decrease max periodic bandwidth, we have to check | |
5009 | * every microframe in the schedule to see whether the decrease is | |
5010 | * possible. | |
5011 | */ | |
5012 | if (uframe_periodic_max < fotg210->uframe_periodic_max) { | |
5013 | allocated_max = 0; | |
5014 | ||
5015 | for (frame = 0; frame < fotg210->periodic_size; ++frame) | |
5016 | for (uframe = 0; uframe < 7; ++uframe) | |
5017 | allocated_max = max(allocated_max, | |
5018 | periodic_usecs(fotg210, frame, uframe)); | |
5019 | ||
5020 | if (allocated_max > uframe_periodic_max) { | |
5021 | fotg210_info(fotg210, | |
5022 | "cannot decrease uframe_periodic_max becase " | |
5023 | "periodic bandwidth is already allocated " | |
5024 | "(%u > %u)\n", | |
5025 | allocated_max, uframe_periodic_max); | |
5026 | goto out_unlock; | |
5027 | } | |
5028 | } | |
5029 | ||
5030 | /* increasing is always ok */ | |
5031 | ||
5032 | fotg210_info(fotg210, "setting max periodic bandwidth to %u%% (== %u usec/uframe)\n", | |
5033 | 100 * uframe_periodic_max/125, uframe_periodic_max); | |
5034 | ||
5035 | if (uframe_periodic_max != 100) | |
5036 | fotg210_warn(fotg210, "max periodic bandwidth set is non-standard\n"); | |
5037 | ||
5038 | fotg210->uframe_periodic_max = uframe_periodic_max; | |
5039 | ret = count; | |
5040 | ||
5041 | out_unlock: | |
5042 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5043 | return ret; | |
5044 | } | |
5045 | ||
5046 | static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, | |
5047 | store_uframe_periodic_max); | |
5048 | ||
5049 | static inline int create_sysfs_files(struct fotg210_hcd *fotg210) | |
5050 | { | |
5051 | struct device *controller = fotg210_to_hcd(fotg210)->self.controller; | |
5052 | int i = 0; | |
5053 | ||
5054 | if (i) | |
5055 | goto out; | |
5056 | ||
5057 | i = device_create_file(controller, &dev_attr_uframe_periodic_max); | |
5058 | out: | |
5059 | return i; | |
5060 | } | |
5061 | ||
5062 | static inline void remove_sysfs_files(struct fotg210_hcd *fotg210) | |
5063 | { | |
5064 | struct device *controller = fotg210_to_hcd(fotg210)->self.controller; | |
5065 | ||
5066 | device_remove_file(controller, &dev_attr_uframe_periodic_max); | |
5067 | } | |
5068 | /*-------------------------------------------------------------------------*/ | |
5069 | ||
5070 | /* On some systems, leaving remote wakeup enabled prevents system shutdown. | |
5071 | * The firmware seems to think that powering off is a wakeup event! | |
5072 | * This routine turns off remote wakeup and everything else, on all ports. | |
5073 | */ | |
5074 | static void fotg210_turn_off_all_ports(struct fotg210_hcd *fotg210) | |
5075 | { | |
5076 | u32 __iomem *status_reg = &fotg210->regs->port_status; | |
5077 | ||
5078 | fotg210_writel(fotg210, PORT_RWC_BITS, status_reg); | |
5079 | } | |
5080 | ||
5081 | /* | |
5082 | * Halt HC, turn off all ports, and let the BIOS use the companion controllers. | |
5083 | * Must be called with interrupts enabled and the lock not held. | |
5084 | */ | |
5085 | static void fotg210_silence_controller(struct fotg210_hcd *fotg210) | |
5086 | { | |
5087 | fotg210_halt(fotg210); | |
5088 | ||
5089 | spin_lock_irq(&fotg210->lock); | |
5090 | fotg210->rh_state = FOTG210_RH_HALTED; | |
5091 | fotg210_turn_off_all_ports(fotg210); | |
5092 | spin_unlock_irq(&fotg210->lock); | |
5093 | } | |
5094 | ||
5095 | /* fotg210_shutdown kick in for silicon on any bus (not just pci, etc). | |
5096 | * This forcibly disables dma and IRQs, helping kexec and other cases | |
5097 | * where the next system software may expect clean state. | |
5098 | */ | |
5099 | static void fotg210_shutdown(struct usb_hcd *hcd) | |
5100 | { | |
5101 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5102 | ||
5103 | spin_lock_irq(&fotg210->lock); | |
5104 | fotg210->shutdown = true; | |
5105 | fotg210->rh_state = FOTG210_RH_STOPPING; | |
5106 | fotg210->enabled_hrtimer_events = 0; | |
5107 | spin_unlock_irq(&fotg210->lock); | |
5108 | ||
5109 | fotg210_silence_controller(fotg210); | |
5110 | ||
5111 | hrtimer_cancel(&fotg210->hrtimer); | |
5112 | } | |
5113 | ||
5114 | /*-------------------------------------------------------------------------*/ | |
5115 | ||
5116 | /* | |
5117 | * fotg210_work is called from some interrupts, timers, and so on. | |
5118 | * it calls driver completion functions, after dropping fotg210->lock. | |
5119 | */ | |
5120 | static void fotg210_work(struct fotg210_hcd *fotg210) | |
5121 | { | |
5122 | /* another CPU may drop fotg210->lock during a schedule scan while | |
5123 | * it reports urb completions. this flag guards against bogus | |
5124 | * attempts at re-entrant schedule scanning. | |
5125 | */ | |
5126 | if (fotg210->scanning) { | |
5127 | fotg210->need_rescan = true; | |
5128 | return; | |
5129 | } | |
5130 | fotg210->scanning = true; | |
5131 | ||
5132 | rescan: | |
5133 | fotg210->need_rescan = false; | |
5134 | if (fotg210->async_count) | |
5135 | scan_async(fotg210); | |
5136 | if (fotg210->intr_count > 0) | |
5137 | scan_intr(fotg210); | |
5138 | if (fotg210->isoc_count > 0) | |
5139 | scan_isoc(fotg210); | |
5140 | if (fotg210->need_rescan) | |
5141 | goto rescan; | |
5142 | fotg210->scanning = false; | |
5143 | ||
5144 | /* the IO watchdog guards against hardware or driver bugs that | |
5145 | * misplace IRQs, and should let us run completely without IRQs. | |
5146 | * such lossage has been observed on both VT6202 and VT8235. | |
5147 | */ | |
5148 | turn_on_io_watchdog(fotg210); | |
5149 | } | |
5150 | ||
5151 | /* | |
5152 | * Called when the fotg210_hcd module is removed. | |
5153 | */ | |
5154 | static void fotg210_stop(struct usb_hcd *hcd) | |
5155 | { | |
5156 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5157 | ||
5158 | fotg210_dbg(fotg210, "stop\n"); | |
5159 | ||
5160 | /* no more interrupts ... */ | |
5161 | ||
5162 | spin_lock_irq(&fotg210->lock); | |
5163 | fotg210->enabled_hrtimer_events = 0; | |
5164 | spin_unlock_irq(&fotg210->lock); | |
5165 | ||
5166 | fotg210_quiesce(fotg210); | |
5167 | fotg210_silence_controller(fotg210); | |
5168 | fotg210_reset(fotg210); | |
5169 | ||
5170 | hrtimer_cancel(&fotg210->hrtimer); | |
5171 | remove_sysfs_files(fotg210); | |
5172 | remove_debug_files(fotg210); | |
5173 | ||
5174 | /* root hub is shut down separately (first, when possible) */ | |
5175 | spin_lock_irq(&fotg210->lock); | |
5176 | end_free_itds(fotg210); | |
5177 | spin_unlock_irq(&fotg210->lock); | |
5178 | fotg210_mem_cleanup(fotg210); | |
5179 | ||
5180 | #ifdef FOTG210_STATS | |
5181 | fotg210_dbg(fotg210, "irq normal %ld err %ld iaa %ld (lost %ld)\n", | |
5182 | fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa, | |
5183 | fotg210->stats.lost_iaa); | |
5184 | fotg210_dbg(fotg210, "complete %ld unlink %ld\n", | |
5185 | fotg210->stats.complete, fotg210->stats.unlink); | |
5186 | #endif | |
5187 | ||
5188 | dbg_status(fotg210, "fotg210_stop completed", | |
5189 | fotg210_readl(fotg210, &fotg210->regs->status)); | |
5190 | } | |
5191 | ||
5192 | /* one-time init, only for memory state */ | |
5193 | static int hcd_fotg210_init(struct usb_hcd *hcd) | |
5194 | { | |
5195 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5196 | u32 temp; | |
5197 | int retval; | |
5198 | u32 hcc_params; | |
5199 | struct fotg210_qh_hw *hw; | |
5200 | ||
5201 | spin_lock_init(&fotg210->lock); | |
5202 | ||
5203 | /* | |
5204 | * keep io watchdog by default, those good HCDs could turn off it later | |
5205 | */ | |
5206 | fotg210->need_io_watchdog = 1; | |
5207 | ||
5208 | hrtimer_init(&fotg210->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
5209 | fotg210->hrtimer.function = fotg210_hrtimer_func; | |
5210 | fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT; | |
5211 | ||
5212 | hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
5213 | ||
5214 | /* | |
5215 | * by default set standard 80% (== 100 usec/uframe) max periodic | |
5216 | * bandwidth as required by USB 2.0 | |
5217 | */ | |
5218 | fotg210->uframe_periodic_max = 100; | |
5219 | ||
5220 | /* | |
5221 | * hw default: 1K periodic list heads, one per frame. | |
5222 | * periodic_size can shrink by USBCMD update if hcc_params allows. | |
5223 | */ | |
5224 | fotg210->periodic_size = DEFAULT_I_TDPS; | |
5225 | INIT_LIST_HEAD(&fotg210->intr_qh_list); | |
5226 | INIT_LIST_HEAD(&fotg210->cached_itd_list); | |
5227 | ||
5228 | if (HCC_PGM_FRAMELISTLEN(hcc_params)) { | |
5229 | /* periodic schedule size can be smaller than default */ | |
5230 | switch (FOTG210_TUNE_FLS) { | |
5231 | case 0: | |
5232 | fotg210->periodic_size = 1024; | |
5233 | break; | |
5234 | case 1: | |
5235 | fotg210->periodic_size = 512; | |
5236 | break; | |
5237 | case 2: | |
5238 | fotg210->periodic_size = 256; | |
5239 | break; | |
5240 | default: | |
5241 | BUG(); | |
5242 | } | |
5243 | } | |
5244 | retval = fotg210_mem_init(fotg210, GFP_KERNEL); | |
5245 | if (retval < 0) | |
5246 | return retval; | |
5247 | ||
5248 | /* controllers may cache some of the periodic schedule ... */ | |
5249 | fotg210->i_thresh = 2; | |
5250 | ||
5251 | /* | |
5252 | * dedicate a qh for the async ring head, since we couldn't unlink | |
5253 | * a 'real' qh without stopping the async schedule [4.8]. use it | |
5254 | * as the 'reclamation list head' too. | |
5255 | * its dummy is used in hw_alt_next of many tds, to prevent the qh | |
5256 | * from automatically advancing to the next td after short reads. | |
5257 | */ | |
5258 | fotg210->async->qh_next.qh = NULL; | |
5259 | hw = fotg210->async->hw; | |
5260 | hw->hw_next = QH_NEXT(fotg210, fotg210->async->qh_dma); | |
5261 | hw->hw_info1 = cpu_to_hc32(fotg210, QH_HEAD); | |
5262 | hw->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT); | |
5263 | hw->hw_qtd_next = FOTG210_LIST_END(fotg210); | |
5264 | fotg210->async->qh_state = QH_STATE_LINKED; | |
5265 | hw->hw_alt_next = QTD_NEXT(fotg210, fotg210->async->dummy->qtd_dma); | |
5266 | ||
5267 | /* clear interrupt enables, set irq latency */ | |
5268 | if (log2_irq_thresh < 0 || log2_irq_thresh > 6) | |
5269 | log2_irq_thresh = 0; | |
5270 | temp = 1 << (16 + log2_irq_thresh); | |
5271 | if (HCC_CANPARK(hcc_params)) { | |
5272 | /* HW default park == 3, on hardware that supports it (like | |
5273 | * NVidia and ALI silicon), maximizes throughput on the async | |
5274 | * schedule by avoiding QH fetches between transfers. | |
5275 | * | |
5276 | * With fast usb storage devices and NForce2, "park" seems to | |
5277 | * make problems: throughput reduction (!), data errors... | |
5278 | */ | |
5279 | if (park) { | |
5280 | park = min_t(unsigned, park, 3); | |
5281 | temp |= CMD_PARK; | |
5282 | temp |= park << 8; | |
5283 | } | |
5284 | fotg210_dbg(fotg210, "park %d\n", park); | |
5285 | } | |
5286 | if (HCC_PGM_FRAMELISTLEN(hcc_params)) { | |
5287 | /* periodic schedule size can be smaller than default */ | |
5288 | temp &= ~(3 << 2); | |
5289 | temp |= (FOTG210_TUNE_FLS << 2); | |
5290 | } | |
5291 | fotg210->command = temp; | |
5292 | ||
5293 | /* Accept arbitrarily long scatter-gather lists */ | |
5294 | if (!(hcd->driver->flags & HCD_LOCAL_MEM)) | |
5295 | hcd->self.sg_tablesize = ~0; | |
5296 | return 0; | |
5297 | } | |
5298 | ||
5299 | /* start HC running; it's halted, hcd_fotg210_init() has been run (once) */ | |
5300 | static int fotg210_run(struct usb_hcd *hcd) | |
5301 | { | |
5302 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5303 | u32 temp; | |
5304 | u32 hcc_params; | |
5305 | ||
5306 | hcd->uses_new_polling = 1; | |
5307 | ||
5308 | /* EHCI spec section 4.1 */ | |
5309 | ||
5310 | fotg210_writel(fotg210, fotg210->periodic_dma, | |
5311 | &fotg210->regs->frame_list); | |
5312 | fotg210_writel(fotg210, (u32)fotg210->async->qh_dma, | |
5313 | &fotg210->regs->async_next); | |
5314 | ||
5315 | /* | |
5316 | * hcc_params controls whether fotg210->regs->segment must (!!!) | |
5317 | * be used; it constrains QH/ITD/SITD and QTD locations. | |
5318 | * pci_pool consistent memory always uses segment zero. | |
5319 | * streaming mappings for I/O buffers, like pci_map_single(), | |
5320 | * can return segments above 4GB, if the device allows. | |
5321 | * | |
5322 | * NOTE: the dma mask is visible through dma_supported(), so | |
5323 | * drivers can pass this info along ... like NETIF_F_HIGHDMA, | |
5324 | * Scsi_Host.highmem_io, and so forth. It's readonly to all | |
5325 | * host side drivers though. | |
5326 | */ | |
5327 | hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
5328 | ||
5329 | /* | |
5330 | * Philips, Intel, and maybe others need CMD_RUN before the | |
5331 | * root hub will detect new devices (why?); NEC doesn't | |
5332 | */ | |
5333 | fotg210->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET); | |
5334 | fotg210->command |= CMD_RUN; | |
5335 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
5336 | dbg_cmd(fotg210, "init", fotg210->command); | |
5337 | ||
5338 | /* | |
5339 | * Start, enabling full USB 2.0 functionality ... usb 1.1 devices | |
5340 | * are explicitly handed to companion controller(s), so no TT is | |
5341 | * involved with the root hub. (Except where one is integrated, | |
5342 | * and there's no companion controller unless maybe for USB OTG.) | |
5343 | * | |
5344 | * Turning on the CF flag will transfer ownership of all ports | |
5345 | * from the companions to the EHCI controller. If any of the | |
5346 | * companions are in the middle of a port reset at the time, it | |
5347 | * could cause trouble. Write-locking ehci_cf_port_reset_rwsem | |
5348 | * guarantees that no resets are in progress. After we set CF, | |
5349 | * a short delay lets the hardware catch up; new resets shouldn't | |
5350 | * be started before the port switching actions could complete. | |
5351 | */ | |
5352 | down_write(&ehci_cf_port_reset_rwsem); | |
5353 | fotg210->rh_state = FOTG210_RH_RUNNING; | |
5354 | /* unblock posted writes */ | |
5355 | fotg210_readl(fotg210, &fotg210->regs->command); | |
5356 | msleep(5); | |
5357 | up_write(&ehci_cf_port_reset_rwsem); | |
5358 | fotg210->last_periodic_enable = ktime_get_real(); | |
5359 | ||
5360 | temp = HC_VERSION(fotg210, | |
5361 | fotg210_readl(fotg210, &fotg210->caps->hc_capbase)); | |
5362 | fotg210_info(fotg210, | |
5363 | "USB %x.%x started, EHCI %x.%02x\n", | |
5364 | ((fotg210->sbrn & 0xf0)>>4), (fotg210->sbrn & 0x0f), | |
5365 | temp >> 8, temp & 0xff); | |
5366 | ||
5367 | fotg210_writel(fotg210, INTR_MASK, | |
5368 | &fotg210->regs->intr_enable); /* Turn On Interrupts */ | |
5369 | ||
5370 | /* GRR this is run-once init(), being done every time the HC starts. | |
5371 | * So long as they're part of class devices, we can't do it init() | |
5372 | * since the class device isn't created that early. | |
5373 | */ | |
5374 | create_debug_files(fotg210); | |
5375 | create_sysfs_files(fotg210); | |
5376 | ||
5377 | return 0; | |
5378 | } | |
5379 | ||
5380 | static int fotg210_setup(struct usb_hcd *hcd) | |
5381 | { | |
5382 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5383 | int retval; | |
5384 | ||
5385 | fotg210->regs = (void __iomem *)fotg210->caps + | |
5386 | HC_LENGTH(fotg210, | |
5387 | fotg210_readl(fotg210, &fotg210->caps->hc_capbase)); | |
5388 | dbg_hcs_params(fotg210, "reset"); | |
5389 | dbg_hcc_params(fotg210, "reset"); | |
5390 | ||
5391 | /* cache this readonly data; minimize chip reads */ | |
5392 | fotg210->hcs_params = fotg210_readl(fotg210, | |
5393 | &fotg210->caps->hcs_params); | |
5394 | ||
5395 | fotg210->sbrn = HCD_USB2; | |
5396 | ||
5397 | /* data structure init */ | |
5398 | retval = hcd_fotg210_init(hcd); | |
5399 | if (retval) | |
5400 | return retval; | |
5401 | ||
5402 | retval = fotg210_halt(fotg210); | |
5403 | if (retval) | |
5404 | return retval; | |
5405 | ||
5406 | fotg210_reset(fotg210); | |
5407 | ||
5408 | return 0; | |
5409 | } | |
5410 | ||
5411 | /*-------------------------------------------------------------------------*/ | |
5412 | ||
5413 | static irqreturn_t fotg210_irq(struct usb_hcd *hcd) | |
5414 | { | |
5415 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5416 | u32 status, masked_status, pcd_status = 0, cmd; | |
5417 | int bh; | |
5418 | ||
5419 | spin_lock(&fotg210->lock); | |
5420 | ||
5421 | status = fotg210_readl(fotg210, &fotg210->regs->status); | |
5422 | ||
5423 | /* e.g. cardbus physical eject */ | |
5424 | if (status == ~(u32) 0) { | |
5425 | fotg210_dbg(fotg210, "device removed\n"); | |
5426 | goto dead; | |
5427 | } | |
5428 | ||
5429 | /* | |
5430 | * We don't use STS_FLR, but some controllers don't like it to | |
5431 | * remain on, so mask it out along with the other status bits. | |
5432 | */ | |
5433 | masked_status = status & (INTR_MASK | STS_FLR); | |
5434 | ||
5435 | /* Shared IRQ? */ | |
5436 | if (!masked_status || | |
5437 | unlikely(fotg210->rh_state == FOTG210_RH_HALTED)) { | |
5438 | spin_unlock(&fotg210->lock); | |
5439 | return IRQ_NONE; | |
5440 | } | |
5441 | ||
5442 | /* clear (just) interrupts */ | |
5443 | fotg210_writel(fotg210, masked_status, &fotg210->regs->status); | |
5444 | cmd = fotg210_readl(fotg210, &fotg210->regs->command); | |
5445 | bh = 0; | |
5446 | ||
5447 | #ifdef VERBOSE_DEBUG | |
5448 | /* unrequested/ignored: Frame List Rollover */ | |
5449 | dbg_status(fotg210, "irq", status); | |
5450 | #endif | |
5451 | ||
5452 | /* INT, ERR, and IAA interrupt rates can be throttled */ | |
5453 | ||
5454 | /* normal [4.15.1.2] or error [4.15.1.1] completion */ | |
5455 | if (likely((status & (STS_INT|STS_ERR)) != 0)) { | |
5456 | if (likely((status & STS_ERR) == 0)) | |
5457 | COUNT(fotg210->stats.normal); | |
5458 | else | |
5459 | COUNT(fotg210->stats.error); | |
5460 | bh = 1; | |
5461 | } | |
5462 | ||
5463 | /* complete the unlinking of some qh [4.15.2.3] */ | |
5464 | if (status & STS_IAA) { | |
5465 | ||
5466 | /* Turn off the IAA watchdog */ | |
5467 | fotg210->enabled_hrtimer_events &= | |
5468 | ~BIT(FOTG210_HRTIMER_IAA_WATCHDOG); | |
5469 | ||
5470 | /* | |
5471 | * Mild optimization: Allow another IAAD to reset the | |
5472 | * hrtimer, if one occurs before the next expiration. | |
5473 | * In theory we could always cancel the hrtimer, but | |
5474 | * tests show that about half the time it will be reset | |
5475 | * for some other event anyway. | |
5476 | */ | |
5477 | if (fotg210->next_hrtimer_event == FOTG210_HRTIMER_IAA_WATCHDOG) | |
5478 | ++fotg210->next_hrtimer_event; | |
5479 | ||
5480 | /* guard against (alleged) silicon errata */ | |
5481 | if (cmd & CMD_IAAD) | |
5482 | fotg210_dbg(fotg210, "IAA with IAAD still set?\n"); | |
5483 | if (fotg210->async_iaa) { | |
5484 | COUNT(fotg210->stats.iaa); | |
5485 | end_unlink_async(fotg210); | |
5486 | } else | |
5487 | fotg210_dbg(fotg210, "IAA with nothing unlinked?\n"); | |
5488 | } | |
5489 | ||
5490 | /* remote wakeup [4.3.1] */ | |
5491 | if (status & STS_PCD) { | |
5492 | int pstatus; | |
5493 | u32 __iomem *status_reg = &fotg210->regs->port_status; | |
5494 | ||
5495 | /* kick root hub later */ | |
5496 | pcd_status = status; | |
5497 | ||
5498 | /* resume root hub? */ | |
5499 | if (fotg210->rh_state == FOTG210_RH_SUSPENDED) | |
5500 | usb_hcd_resume_root_hub(hcd); | |
5501 | ||
5502 | pstatus = fotg210_readl(fotg210, status_reg); | |
5503 | ||
5504 | if (test_bit(0, &fotg210->suspended_ports) && | |
5505 | ((pstatus & PORT_RESUME) || | |
5506 | !(pstatus & PORT_SUSPEND)) && | |
5507 | (pstatus & PORT_PE) && | |
5508 | fotg210->reset_done[0] == 0) { | |
5509 | ||
5510 | /* start 20 msec resume signaling from this port, | |
5511 | * and make khubd collect PORT_STAT_C_SUSPEND to | |
5512 | * stop that signaling. Use 5 ms extra for safety, | |
5513 | * like usb_port_resume() does. | |
5514 | */ | |
5515 | fotg210->reset_done[0] = jiffies + msecs_to_jiffies(25); | |
5516 | set_bit(0, &fotg210->resuming_ports); | |
5517 | fotg210_dbg(fotg210, "port 1 remote wakeup\n"); | |
5518 | mod_timer(&hcd->rh_timer, fotg210->reset_done[0]); | |
5519 | } | |
5520 | } | |
5521 | ||
5522 | /* PCI errors [4.15.2.4] */ | |
5523 | if (unlikely((status & STS_FATAL) != 0)) { | |
5524 | fotg210_err(fotg210, "fatal error\n"); | |
5525 | dbg_cmd(fotg210, "fatal", cmd); | |
5526 | dbg_status(fotg210, "fatal", status); | |
5527 | dead: | |
5528 | usb_hc_died(hcd); | |
5529 | ||
5530 | /* Don't let the controller do anything more */ | |
5531 | fotg210->shutdown = true; | |
5532 | fotg210->rh_state = FOTG210_RH_STOPPING; | |
5533 | fotg210->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE); | |
5534 | fotg210_writel(fotg210, fotg210->command, | |
5535 | &fotg210->regs->command); | |
5536 | fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); | |
5537 | fotg210_handle_controller_death(fotg210); | |
5538 | ||
5539 | /* Handle completions when the controller stops */ | |
5540 | bh = 0; | |
5541 | } | |
5542 | ||
5543 | if (bh) | |
5544 | fotg210_work(fotg210); | |
5545 | spin_unlock(&fotg210->lock); | |
5546 | if (pcd_status) | |
5547 | usb_hcd_poll_rh_status(hcd); | |
5548 | return IRQ_HANDLED; | |
5549 | } | |
5550 | ||
5551 | /*-------------------------------------------------------------------------*/ | |
5552 | ||
5553 | /* | |
5554 | * non-error returns are a promise to giveback() the urb later | |
5555 | * we drop ownership so next owner (or urb unlink) can get it | |
5556 | * | |
5557 | * urb + dev is in hcd.self.controller.urb_list | |
5558 | * we're queueing TDs onto software and hardware lists | |
5559 | * | |
5560 | * hcd-specific init for hcpriv hasn't been done yet | |
5561 | * | |
5562 | * NOTE: control, bulk, and interrupt share the same code to append TDs | |
5563 | * to a (possibly active) QH, and the same QH scanning code. | |
5564 | */ | |
5565 | static int fotg210_urb_enqueue( | |
5566 | struct usb_hcd *hcd, | |
5567 | struct urb *urb, | |
5568 | gfp_t mem_flags | |
5569 | ) { | |
5570 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5571 | struct list_head qtd_list; | |
5572 | ||
5573 | INIT_LIST_HEAD(&qtd_list); | |
5574 | ||
5575 | switch (usb_pipetype(urb->pipe)) { | |
5576 | case PIPE_CONTROL: | |
5577 | /* qh_completions() code doesn't handle all the fault cases | |
5578 | * in multi-TD control transfers. Even 1KB is rare anyway. | |
5579 | */ | |
5580 | if (urb->transfer_buffer_length > (16 * 1024)) | |
5581 | return -EMSGSIZE; | |
5582 | /* FALLTHROUGH */ | |
5583 | /* case PIPE_BULK: */ | |
5584 | default: | |
5585 | if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags)) | |
5586 | return -ENOMEM; | |
5587 | return submit_async(fotg210, urb, &qtd_list, mem_flags); | |
5588 | ||
5589 | case PIPE_INTERRUPT: | |
5590 | if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags)) | |
5591 | return -ENOMEM; | |
5592 | return intr_submit(fotg210, urb, &qtd_list, mem_flags); | |
5593 | ||
5594 | case PIPE_ISOCHRONOUS: | |
5595 | return itd_submit(fotg210, urb, mem_flags); | |
5596 | } | |
5597 | } | |
5598 | ||
5599 | /* remove from hardware lists | |
5600 | * completions normally happen asynchronously | |
5601 | */ | |
5602 | ||
5603 | static int fotg210_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) | |
5604 | { | |
5605 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5606 | struct fotg210_qh *qh; | |
5607 | unsigned long flags; | |
5608 | int rc; | |
5609 | ||
5610 | spin_lock_irqsave(&fotg210->lock, flags); | |
5611 | rc = usb_hcd_check_unlink_urb(hcd, urb, status); | |
5612 | if (rc) | |
5613 | goto done; | |
5614 | ||
5615 | switch (usb_pipetype(urb->pipe)) { | |
5616 | /* case PIPE_CONTROL: */ | |
5617 | /* case PIPE_BULK:*/ | |
5618 | default: | |
5619 | qh = (struct fotg210_qh *) urb->hcpriv; | |
5620 | if (!qh) | |
5621 | break; | |
5622 | switch (qh->qh_state) { | |
5623 | case QH_STATE_LINKED: | |
5624 | case QH_STATE_COMPLETING: | |
5625 | start_unlink_async(fotg210, qh); | |
5626 | break; | |
5627 | case QH_STATE_UNLINK: | |
5628 | case QH_STATE_UNLINK_WAIT: | |
5629 | /* already started */ | |
5630 | break; | |
5631 | case QH_STATE_IDLE: | |
5632 | /* QH might be waiting for a Clear-TT-Buffer */ | |
5633 | qh_completions(fotg210, qh); | |
5634 | break; | |
5635 | } | |
5636 | break; | |
5637 | ||
5638 | case PIPE_INTERRUPT: | |
5639 | qh = (struct fotg210_qh *) urb->hcpriv; | |
5640 | if (!qh) | |
5641 | break; | |
5642 | switch (qh->qh_state) { | |
5643 | case QH_STATE_LINKED: | |
5644 | case QH_STATE_COMPLETING: | |
5645 | start_unlink_intr(fotg210, qh); | |
5646 | break; | |
5647 | case QH_STATE_IDLE: | |
5648 | qh_completions(fotg210, qh); | |
5649 | break; | |
5650 | default: | |
5651 | fotg210_dbg(fotg210, "bogus qh %p state %d\n", | |
5652 | qh, qh->qh_state); | |
5653 | goto done; | |
5654 | } | |
5655 | break; | |
5656 | ||
5657 | case PIPE_ISOCHRONOUS: | |
5658 | /* itd... */ | |
5659 | ||
5660 | /* wait till next completion, do it then. */ | |
5661 | /* completion irqs can wait up to 1024 msec, */ | |
5662 | break; | |
5663 | } | |
5664 | done: | |
5665 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5666 | return rc; | |
5667 | } | |
5668 | ||
5669 | /*-------------------------------------------------------------------------*/ | |
5670 | ||
5671 | /* bulk qh holds the data toggle */ | |
5672 | ||
5673 | static void | |
5674 | fotg210_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep) | |
5675 | { | |
5676 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5677 | unsigned long flags; | |
5678 | struct fotg210_qh *qh, *tmp; | |
5679 | ||
5680 | /* ASSERT: any requests/urbs are being unlinked */ | |
5681 | /* ASSERT: nobody can be submitting urbs for this any more */ | |
5682 | ||
5683 | rescan: | |
5684 | spin_lock_irqsave(&fotg210->lock, flags); | |
5685 | qh = ep->hcpriv; | |
5686 | if (!qh) | |
5687 | goto done; | |
5688 | ||
5689 | /* endpoints can be iso streams. for now, we don't | |
5690 | * accelerate iso completions ... so spin a while. | |
5691 | */ | |
5692 | if (qh->hw == NULL) { | |
5693 | struct fotg210_iso_stream *stream = ep->hcpriv; | |
5694 | ||
5695 | if (!list_empty(&stream->td_list)) | |
5696 | goto idle_timeout; | |
5697 | ||
5698 | /* BUG_ON(!list_empty(&stream->free_list)); */ | |
5699 | kfree(stream); | |
5700 | goto done; | |
5701 | } | |
5702 | ||
5703 | if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
5704 | qh->qh_state = QH_STATE_IDLE; | |
5705 | switch (qh->qh_state) { | |
5706 | case QH_STATE_LINKED: | |
5707 | case QH_STATE_COMPLETING: | |
5708 | for (tmp = fotg210->async->qh_next.qh; | |
5709 | tmp && tmp != qh; | |
5710 | tmp = tmp->qh_next.qh) | |
5711 | continue; | |
5712 | /* periodic qh self-unlinks on empty, and a COMPLETING qh | |
5713 | * may already be unlinked. | |
5714 | */ | |
5715 | if (tmp) | |
5716 | start_unlink_async(fotg210, qh); | |
5717 | /* FALL THROUGH */ | |
5718 | case QH_STATE_UNLINK: /* wait for hw to finish? */ | |
5719 | case QH_STATE_UNLINK_WAIT: | |
5720 | idle_timeout: | |
5721 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5722 | schedule_timeout_uninterruptible(1); | |
5723 | goto rescan; | |
5724 | case QH_STATE_IDLE: /* fully unlinked */ | |
5725 | if (qh->clearing_tt) | |
5726 | goto idle_timeout; | |
5727 | if (list_empty(&qh->qtd_list)) { | |
5728 | qh_destroy(fotg210, qh); | |
5729 | break; | |
5730 | } | |
5731 | /* else FALL THROUGH */ | |
5732 | default: | |
5733 | /* caller was supposed to have unlinked any requests; | |
5734 | * that's not our job. just leak this memory. | |
5735 | */ | |
5736 | fotg210_err(fotg210, "qh %p (#%02x) state %d%s\n", | |
5737 | qh, ep->desc.bEndpointAddress, qh->qh_state, | |
5738 | list_empty(&qh->qtd_list) ? "" : "(has tds)"); | |
5739 | break; | |
5740 | } | |
5741 | done: | |
5742 | ep->hcpriv = NULL; | |
5743 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5744 | } | |
5745 | ||
5746 | static void | |
5747 | fotg210_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep) | |
5748 | { | |
5749 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5750 | struct fotg210_qh *qh; | |
5751 | int eptype = usb_endpoint_type(&ep->desc); | |
5752 | int epnum = usb_endpoint_num(&ep->desc); | |
5753 | int is_out = usb_endpoint_dir_out(&ep->desc); | |
5754 | unsigned long flags; | |
5755 | ||
5756 | if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT) | |
5757 | return; | |
5758 | ||
5759 | spin_lock_irqsave(&fotg210->lock, flags); | |
5760 | qh = ep->hcpriv; | |
5761 | ||
5762 | /* For Bulk and Interrupt endpoints we maintain the toggle state | |
5763 | * in the hardware; the toggle bits in udev aren't used at all. | |
5764 | * When an endpoint is reset by usb_clear_halt() we must reset | |
5765 | * the toggle bit in the QH. | |
5766 | */ | |
5767 | if (qh) { | |
5768 | usb_settoggle(qh->dev, epnum, is_out, 0); | |
5769 | if (!list_empty(&qh->qtd_list)) { | |
5770 | WARN_ONCE(1, "clear_halt for a busy endpoint\n"); | |
5771 | } else if (qh->qh_state == QH_STATE_LINKED || | |
5772 | qh->qh_state == QH_STATE_COMPLETING) { | |
5773 | ||
5774 | /* The toggle value in the QH can't be updated | |
5775 | * while the QH is active. Unlink it now; | |
5776 | * re-linking will call qh_refresh(). | |
5777 | */ | |
5778 | if (eptype == USB_ENDPOINT_XFER_BULK) | |
5779 | start_unlink_async(fotg210, qh); | |
5780 | else | |
5781 | start_unlink_intr(fotg210, qh); | |
5782 | } | |
5783 | } | |
5784 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5785 | } | |
5786 | ||
5787 | static int fotg210_get_frame(struct usb_hcd *hcd) | |
5788 | { | |
5789 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5790 | return (fotg210_read_frame_index(fotg210) >> 3) % | |
5791 | fotg210->periodic_size; | |
5792 | } | |
5793 | ||
5794 | /*-------------------------------------------------------------------------*/ | |
5795 | ||
5796 | /* | |
5797 | * The EHCI in ChipIdea HDRC cannot be a separate module or device, | |
5798 | * because its registers (and irq) are shared between host/gadget/otg | |
5799 | * functions and in order to facilitate role switching we cannot | |
5800 | * give the fotg210 driver exclusive access to those. | |
5801 | */ | |
5802 | MODULE_DESCRIPTION(DRIVER_DESC); | |
5803 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
5804 | MODULE_LICENSE("GPL"); | |
5805 | ||
5806 | static const struct hc_driver fotg210_fotg210_hc_driver = { | |
5807 | .description = hcd_name, | |
5808 | .product_desc = "Faraday USB2.0 Host Controller", | |
5809 | .hcd_priv_size = sizeof(struct fotg210_hcd), | |
5810 | ||
5811 | /* | |
5812 | * generic hardware linkage | |
5813 | */ | |
5814 | .irq = fotg210_irq, | |
5815 | .flags = HCD_MEMORY | HCD_USB2, | |
5816 | ||
5817 | /* | |
5818 | * basic lifecycle operations | |
5819 | */ | |
5820 | .reset = hcd_fotg210_init, | |
5821 | .start = fotg210_run, | |
5822 | .stop = fotg210_stop, | |
5823 | .shutdown = fotg210_shutdown, | |
5824 | ||
5825 | /* | |
5826 | * managing i/o requests and associated device resources | |
5827 | */ | |
5828 | .urb_enqueue = fotg210_urb_enqueue, | |
5829 | .urb_dequeue = fotg210_urb_dequeue, | |
5830 | .endpoint_disable = fotg210_endpoint_disable, | |
5831 | .endpoint_reset = fotg210_endpoint_reset, | |
5832 | ||
5833 | /* | |
5834 | * scheduling support | |
5835 | */ | |
5836 | .get_frame_number = fotg210_get_frame, | |
5837 | ||
5838 | /* | |
5839 | * root hub support | |
5840 | */ | |
5841 | .hub_status_data = fotg210_hub_status_data, | |
5842 | .hub_control = fotg210_hub_control, | |
5843 | .bus_suspend = fotg210_bus_suspend, | |
5844 | .bus_resume = fotg210_bus_resume, | |
5845 | ||
5846 | .relinquish_port = fotg210_relinquish_port, | |
5847 | .port_handed_over = fotg210_port_handed_over, | |
5848 | ||
5849 | .clear_tt_buffer_complete = fotg210_clear_tt_buffer_complete, | |
5850 | }; | |
5851 | ||
5852 | static void fotg210_init(struct fotg210_hcd *fotg210) | |
5853 | { | |
5854 | u32 value; | |
5855 | ||
5856 | iowrite32(GMIR_MDEV_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY, | |
5857 | &fotg210->regs->gmir); | |
5858 | ||
5859 | value = ioread32(&fotg210->regs->otgcsr); | |
5860 | value &= ~OTGCSR_A_BUS_DROP; | |
5861 | value |= OTGCSR_A_BUS_REQ; | |
5862 | iowrite32(value, &fotg210->regs->otgcsr); | |
5863 | } | |
5864 | ||
5865 | /** | |
5866 | * fotg210_hcd_probe - initialize faraday FOTG210 HCDs | |
5867 | * | |
5868 | * Allocates basic resources for this USB host controller, and | |
5869 | * then invokes the start() method for the HCD associated with it | |
5870 | * through the hotplug entry's driver_data. | |
5871 | */ | |
5872 | static int fotg210_hcd_probe(struct platform_device *pdev) | |
5873 | { | |
5874 | struct device *dev = &pdev->dev; | |
5875 | struct usb_hcd *hcd; | |
5876 | struct resource *res; | |
5877 | int irq; | |
5878 | int retval = -ENODEV; | |
5879 | struct fotg210_hcd *fotg210; | |
5880 | ||
5881 | if (usb_disabled()) | |
5882 | return -ENODEV; | |
5883 | ||
5884 | pdev->dev.power.power_state = PMSG_ON; | |
5885 | ||
5886 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
5887 | if (!res) { | |
5888 | dev_err(dev, | |
5889 | "Found HC with no IRQ. Check %s setup!\n", | |
5890 | dev_name(dev)); | |
5891 | return -ENODEV; | |
5892 | } | |
5893 | ||
5894 | irq = res->start; | |
5895 | ||
5896 | hcd = usb_create_hcd(&fotg210_fotg210_hc_driver, dev, | |
5897 | dev_name(dev)); | |
5898 | if (!hcd) { | |
5899 | dev_err(dev, "failed to create hcd with err %d\n", retval); | |
5900 | retval = -ENOMEM; | |
5901 | goto fail_create_hcd; | |
5902 | } | |
5903 | ||
5904 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
5905 | if (!res) { | |
5906 | dev_err(dev, | |
5907 | "Found HC with no register addr. Check %s setup!\n", | |
5908 | dev_name(dev)); | |
5909 | retval = -ENODEV; | |
5910 | goto fail_request_resource; | |
5911 | } | |
5912 | ||
5913 | hcd->rsrc_start = res->start; | |
5914 | hcd->rsrc_len = resource_size(res); | |
5915 | hcd->has_tt = 1; | |
5916 | ||
5917 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, | |
5918 | fotg210_fotg210_hc_driver.description)) { | |
5919 | dev_dbg(dev, "controller already in use\n"); | |
5920 | retval = -EBUSY; | |
5921 | goto fail_request_resource; | |
5922 | } | |
5923 | ||
5924 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
5925 | if (!res) { | |
5926 | dev_err(dev, | |
5927 | "Found HC with no register addr. Check %s setup!\n", | |
5928 | dev_name(dev)); | |
5929 | retval = -ENODEV; | |
5930 | goto fail_request_resource; | |
5931 | } | |
5932 | ||
5933 | hcd->regs = ioremap_nocache(res->start, resource_size(res)); | |
5934 | if (hcd->regs == NULL) { | |
5935 | dev_dbg(dev, "error mapping memory\n"); | |
5936 | retval = -EFAULT; | |
5937 | goto fail_ioremap; | |
5938 | } | |
5939 | ||
5940 | fotg210 = hcd_to_fotg210(hcd); | |
5941 | ||
5942 | fotg210->caps = hcd->regs; | |
5943 | ||
5944 | retval = fotg210_setup(hcd); | |
5945 | if (retval) | |
5946 | goto fail_add_hcd; | |
5947 | ||
5948 | fotg210_init(fotg210); | |
5949 | ||
5950 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
5951 | if (retval) { | |
5952 | dev_err(dev, "failed to add hcd with err %d\n", retval); | |
5953 | goto fail_add_hcd; | |
5954 | } | |
5955 | ||
5956 | return retval; | |
5957 | ||
5958 | fail_add_hcd: | |
5959 | iounmap(hcd->regs); | |
5960 | fail_ioremap: | |
5961 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
5962 | fail_request_resource: | |
5963 | usb_put_hcd(hcd); | |
5964 | fail_create_hcd: | |
5965 | dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval); | |
5966 | return retval; | |
5967 | } | |
5968 | ||
5969 | /** | |
5970 | * fotg210_hcd_remove - shutdown processing for EHCI HCDs | |
5971 | * @dev: USB Host Controller being removed | |
5972 | * | |
5973 | */ | |
5974 | static int fotg210_hcd_remove(struct platform_device *pdev) | |
5975 | { | |
5976 | struct device *dev = &pdev->dev; | |
5977 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
5978 | ||
5979 | if (!hcd) | |
5980 | return 0; | |
5981 | ||
5982 | usb_remove_hcd(hcd); | |
5983 | iounmap(hcd->regs); | |
5984 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
5985 | usb_put_hcd(hcd); | |
5986 | ||
5987 | return 0; | |
5988 | } | |
5989 | ||
5990 | static struct platform_driver fotg210_hcd_driver = { | |
5991 | .driver = { | |
5992 | .name = "fotg210-hcd", | |
5993 | }, | |
5994 | .probe = fotg210_hcd_probe, | |
5995 | .remove = fotg210_hcd_remove, | |
5996 | }; | |
5997 | ||
5998 | static int __init fotg210_hcd_init(void) | |
5999 | { | |
6000 | int retval = 0; | |
6001 | ||
6002 | if (usb_disabled()) | |
6003 | return -ENODEV; | |
6004 | ||
6005 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); | |
6006 | set_bit(USB_EHCI_LOADED, &usb_hcds_loaded); | |
6007 | if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) || | |
6008 | test_bit(USB_OHCI_LOADED, &usb_hcds_loaded)) | |
6009 | pr_warn(KERN_WARNING "Warning! fotg210_hcd should always be loaded before uhci_hcd and ohci_hcd, not after\n"); | |
6010 | ||
6011 | pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n", | |
6012 | hcd_name, | |
6013 | sizeof(struct fotg210_qh), sizeof(struct fotg210_qtd), | |
6014 | sizeof(struct fotg210_itd)); | |
6015 | ||
6016 | #ifdef DEBUG | |
6017 | fotg210_debug_root = debugfs_create_dir("fotg210", usb_debug_root); | |
6018 | if (!fotg210_debug_root) { | |
6019 | retval = -ENOENT; | |
6020 | goto err_debug; | |
6021 | } | |
6022 | #endif | |
6023 | ||
6024 | retval = platform_driver_register(&fotg210_hcd_driver); | |
6025 | if (retval < 0) | |
6026 | goto clean; | |
6027 | return retval; | |
6028 | ||
6029 | platform_driver_unregister(&fotg210_hcd_driver); | |
6030 | clean: | |
6031 | #ifdef DEBUG | |
6032 | debugfs_remove(fotg210_debug_root); | |
6033 | fotg210_debug_root = NULL; | |
6034 | err_debug: | |
6035 | #endif | |
6036 | clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); | |
6037 | return retval; | |
6038 | } | |
6039 | module_init(fotg210_hcd_init); | |
6040 | ||
6041 | static void __exit fotg210_hcd_cleanup(void) | |
6042 | { | |
6043 | platform_driver_unregister(&fotg210_hcd_driver); | |
6044 | #ifdef DEBUG | |
6045 | debugfs_remove(fotg210_debug_root); | |
6046 | #endif | |
6047 | clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); | |
6048 | } | |
6049 | module_exit(fotg210_hcd_cleanup); |