]>
Commit | Line | Data |
---|---|---|
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 | ||
7d50195f FHC |
59 | #undef FOTG210_URB_TRACE |
60 | ||
7d50195f | 61 | #define FOTG210_STATS |
7d50195f FHC |
62 | |
63 | /* magic numbers that can affect system performance */ | |
64 | #define FOTG210_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */ | |
65 | #define FOTG210_TUNE_RL_HS 4 /* nak throttle; see 4.9 */ | |
66 | #define FOTG210_TUNE_RL_TT 0 | |
67 | #define FOTG210_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */ | |
68 | #define FOTG210_TUNE_MULT_TT 1 | |
69 | /* | |
70 | * Some drivers think it's safe to schedule isochronous transfers more than | |
71 | * 256 ms into the future (partly as a result of an old bug in the scheduling | |
72 | * code). In an attempt to avoid trouble, we will use a minimum scheduling | |
73 | * length of 512 frames instead of 256. | |
74 | */ | |
75 | #define FOTG210_TUNE_FLS 1 /* (medium) 512-frame schedule */ | |
76 | ||
77 | /* Initial IRQ latency: faster than hw default */ | |
78 | static int log2_irq_thresh; /* 0 to 6 */ | |
79 | module_param(log2_irq_thresh, int, S_IRUGO); | |
80 | MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes"); | |
81 | ||
82 | /* initial park setting: slower than hw default */ | |
83 | static unsigned park; | |
84 | module_param(park, uint, S_IRUGO); | |
85 | MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets"); | |
86 | ||
87 | /* for link power management(LPM) feature */ | |
88 | static unsigned int hird; | |
89 | module_param(hird, int, S_IRUGO); | |
90 | MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us"); | |
91 | ||
92 | #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT) | |
93 | ||
94 | #include "fotg210.h" | |
95 | ||
96 | /*-------------------------------------------------------------------------*/ | |
97 | ||
98 | #define fotg210_dbg(fotg210, fmt, args...) \ | |
99 | dev_dbg(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
100 | #define fotg210_err(fotg210, fmt, args...) \ | |
101 | dev_err(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
102 | #define fotg210_info(fotg210, fmt, args...) \ | |
103 | dev_info(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
104 | #define fotg210_warn(fotg210, fmt, args...) \ | |
105 | dev_warn(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) | |
106 | ||
7d50195f FHC |
107 | /* check the values in the HCSPARAMS register |
108 | * (host controller _Structural_ parameters) | |
109 | * see EHCI spec, Table 2-4 for each value | |
110 | */ | |
111 | static void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label) | |
112 | { | |
113 | u32 params = fotg210_readl(fotg210, &fotg210->caps->hcs_params); | |
114 | ||
115 | fotg210_dbg(fotg210, | |
116 | "%s hcs_params 0x%x ports=%d\n", | |
117 | label, params, | |
118 | HCS_N_PORTS(params) | |
119 | ); | |
120 | } | |
7d50195f FHC |
121 | |
122 | /* check the values in the HCCPARAMS register | |
123 | * (host controller _Capability_ parameters) | |
124 | * see EHCI Spec, Table 2-5 for each value | |
125 | * */ | |
126 | static void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label) | |
127 | { | |
128 | u32 params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
129 | ||
130 | fotg210_dbg(fotg210, | |
131 | "%s hcc_params %04x uframes %s%s\n", | |
132 | label, | |
133 | params, | |
134 | HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024", | |
135 | HCC_CANPARK(params) ? " park" : ""); | |
136 | } | |
7d50195f FHC |
137 | |
138 | static void __maybe_unused | |
139 | dbg_qtd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd) | |
140 | { | |
141 | fotg210_dbg(fotg210, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd, | |
142 | hc32_to_cpup(fotg210, &qtd->hw_next), | |
143 | hc32_to_cpup(fotg210, &qtd->hw_alt_next), | |
144 | hc32_to_cpup(fotg210, &qtd->hw_token), | |
145 | hc32_to_cpup(fotg210, &qtd->hw_buf[0])); | |
146 | if (qtd->hw_buf[1]) | |
147 | fotg210_dbg(fotg210, " p1=%08x p2=%08x p3=%08x p4=%08x\n", | |
148 | hc32_to_cpup(fotg210, &qtd->hw_buf[1]), | |
149 | hc32_to_cpup(fotg210, &qtd->hw_buf[2]), | |
150 | hc32_to_cpup(fotg210, &qtd->hw_buf[3]), | |
151 | hc32_to_cpup(fotg210, &qtd->hw_buf[4])); | |
152 | } | |
153 | ||
154 | static void __maybe_unused | |
155 | dbg_qh(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
156 | { | |
157 | struct fotg210_qh_hw *hw = qh->hw; | |
158 | ||
159 | fotg210_dbg(fotg210, "%s qh %p n%08x info %x %x qtd %x\n", label, | |
160 | qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current); | |
161 | dbg_qtd("overlay", fotg210, (struct fotg210_qtd *) &hw->hw_qtd_next); | |
162 | } | |
163 | ||
164 | static void __maybe_unused | |
165 | dbg_itd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_itd *itd) | |
166 | { | |
167 | fotg210_dbg(fotg210, "%s[%d] itd %p, next %08x, urb %p\n", | |
168 | label, itd->frame, itd, hc32_to_cpu(fotg210, itd->hw_next), | |
169 | itd->urb); | |
170 | fotg210_dbg(fotg210, | |
171 | " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
172 | hc32_to_cpu(fotg210, itd->hw_transaction[0]), | |
173 | hc32_to_cpu(fotg210, itd->hw_transaction[1]), | |
174 | hc32_to_cpu(fotg210, itd->hw_transaction[2]), | |
175 | hc32_to_cpu(fotg210, itd->hw_transaction[3]), | |
176 | hc32_to_cpu(fotg210, itd->hw_transaction[4]), | |
177 | hc32_to_cpu(fotg210, itd->hw_transaction[5]), | |
178 | hc32_to_cpu(fotg210, itd->hw_transaction[6]), | |
179 | hc32_to_cpu(fotg210, itd->hw_transaction[7])); | |
180 | fotg210_dbg(fotg210, | |
181 | " buf: %08x %08x %08x %08x %08x %08x %08x\n", | |
182 | hc32_to_cpu(fotg210, itd->hw_bufp[0]), | |
183 | hc32_to_cpu(fotg210, itd->hw_bufp[1]), | |
184 | hc32_to_cpu(fotg210, itd->hw_bufp[2]), | |
185 | hc32_to_cpu(fotg210, itd->hw_bufp[3]), | |
186 | hc32_to_cpu(fotg210, itd->hw_bufp[4]), | |
187 | hc32_to_cpu(fotg210, itd->hw_bufp[5]), | |
188 | hc32_to_cpu(fotg210, itd->hw_bufp[6])); | |
189 | fotg210_dbg(fotg210, " index: %d %d %d %d %d %d %d %d\n", | |
190 | itd->index[0], itd->index[1], itd->index[2], | |
191 | itd->index[3], itd->index[4], itd->index[5], | |
192 | itd->index[6], itd->index[7]); | |
193 | } | |
194 | ||
195 | static int __maybe_unused | |
196 | dbg_status_buf(char *buf, unsigned len, const char *label, u32 status) | |
197 | { | |
198 | return scnprintf(buf, len, | |
199 | "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s", | |
200 | label, label[0] ? " " : "", status, | |
201 | (status & STS_ASS) ? " Async" : "", | |
202 | (status & STS_PSS) ? " Periodic" : "", | |
203 | (status & STS_RECL) ? " Recl" : "", | |
204 | (status & STS_HALT) ? " Halt" : "", | |
205 | (status & STS_IAA) ? " IAA" : "", | |
206 | (status & STS_FATAL) ? " FATAL" : "", | |
207 | (status & STS_FLR) ? " FLR" : "", | |
208 | (status & STS_PCD) ? " PCD" : "", | |
209 | (status & STS_ERR) ? " ERR" : "", | |
210 | (status & STS_INT) ? " INT" : "" | |
211 | ); | |
212 | } | |
213 | ||
214 | static int __maybe_unused | |
215 | dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable) | |
216 | { | |
217 | return scnprintf(buf, len, | |
218 | "%s%sintrenable %02x%s%s%s%s%s%s", | |
219 | label, label[0] ? " " : "", enable, | |
220 | (enable & STS_IAA) ? " IAA" : "", | |
221 | (enable & STS_FATAL) ? " FATAL" : "", | |
222 | (enable & STS_FLR) ? " FLR" : "", | |
223 | (enable & STS_PCD) ? " PCD" : "", | |
224 | (enable & STS_ERR) ? " ERR" : "", | |
225 | (enable & STS_INT) ? " INT" : "" | |
226 | ); | |
227 | } | |
228 | ||
229 | static const char *const fls_strings[] = { "1024", "512", "256", "??" }; | |
230 | ||
231 | static int | |
232 | dbg_command_buf(char *buf, unsigned len, const char *label, u32 command) | |
233 | { | |
234 | return scnprintf(buf, len, | |
235 | "%s%scommand %07x %s=%d ithresh=%d%s%s%s " | |
236 | "period=%s%s %s", | |
237 | label, label[0] ? " " : "", command, | |
238 | (command & CMD_PARK) ? " park" : "(park)", | |
239 | CMD_PARK_CNT(command), | |
240 | (command >> 16) & 0x3f, | |
241 | (command & CMD_IAAD) ? " IAAD" : "", | |
242 | (command & CMD_ASE) ? " Async" : "", | |
243 | (command & CMD_PSE) ? " Periodic" : "", | |
244 | fls_strings[(command >> 2) & 0x3], | |
245 | (command & CMD_RESET) ? " Reset" : "", | |
246 | (command & CMD_RUN) ? "RUN" : "HALT" | |
247 | ); | |
248 | } | |
249 | ||
f848a88d ON |
250 | static char |
251 | *dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status) | |
7d50195f FHC |
252 | { |
253 | char *sig; | |
254 | ||
255 | /* signaling state */ | |
256 | switch (status & (3 << 10)) { | |
257 | case 0 << 10: | |
258 | sig = "se0"; | |
259 | break; | |
260 | case 1 << 10: | |
261 | sig = "k"; | |
262 | break; /* low speed */ | |
263 | case 2 << 10: | |
264 | sig = "j"; | |
265 | break; | |
266 | default: | |
267 | sig = "?"; | |
268 | break; | |
269 | } | |
270 | ||
f848a88d | 271 | scnprintf(buf, len, |
7d50195f FHC |
272 | "%s%sport:%d status %06x %d " |
273 | "sig=%s%s%s%s%s%s%s%s", | |
274 | label, label[0] ? " " : "", port, status, | |
275 | status>>25,/*device address */ | |
276 | sig, | |
277 | (status & PORT_RESET) ? " RESET" : "", | |
278 | (status & PORT_SUSPEND) ? " SUSPEND" : "", | |
279 | (status & PORT_RESUME) ? " RESUME" : "", | |
280 | (status & PORT_PEC) ? " PEC" : "", | |
281 | (status & PORT_PE) ? " PE" : "", | |
282 | (status & PORT_CSC) ? " CSC" : "", | |
283 | (status & PORT_CONNECT) ? " CONNECT" : ""); | |
f848a88d | 284 | return buf; |
7d50195f FHC |
285 | } |
286 | ||
7d50195f FHC |
287 | /* functions have the "wrong" filename when they're output... */ |
288 | #define dbg_status(fotg210, label, status) { \ | |
289 | char _buf[80]; \ | |
290 | dbg_status_buf(_buf, sizeof(_buf), label, status); \ | |
291 | fotg210_dbg(fotg210, "%s\n", _buf); \ | |
292 | } | |
293 | ||
294 | #define dbg_cmd(fotg210, label, command) { \ | |
295 | char _buf[80]; \ | |
296 | dbg_command_buf(_buf, sizeof(_buf), label, command); \ | |
297 | fotg210_dbg(fotg210, "%s\n", _buf); \ | |
298 | } | |
299 | ||
300 | #define dbg_port(fotg210, label, port, status) { \ | |
301 | char _buf[80]; \ | |
f848a88d | 302 | fotg210_dbg(fotg210, "%s\n", dbg_port_buf(_buf, sizeof(_buf), label, port, status) ); \ |
7d50195f FHC |
303 | } |
304 | ||
305 | /*-------------------------------------------------------------------------*/ | |
306 | ||
7d50195f FHC |
307 | /* troubleshooting help: expose state in debugfs */ |
308 | ||
309 | static int debug_async_open(struct inode *, struct file *); | |
310 | static int debug_periodic_open(struct inode *, struct file *); | |
311 | static int debug_registers_open(struct inode *, struct file *); | |
312 | static int debug_async_open(struct inode *, struct file *); | |
313 | ||
314 | static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*); | |
315 | static int debug_close(struct inode *, struct file *); | |
316 | ||
317 | static const struct file_operations debug_async_fops = { | |
318 | .owner = THIS_MODULE, | |
319 | .open = debug_async_open, | |
320 | .read = debug_output, | |
321 | .release = debug_close, | |
322 | .llseek = default_llseek, | |
323 | }; | |
324 | static const struct file_operations debug_periodic_fops = { | |
325 | .owner = THIS_MODULE, | |
326 | .open = debug_periodic_open, | |
327 | .read = debug_output, | |
328 | .release = debug_close, | |
329 | .llseek = default_llseek, | |
330 | }; | |
331 | static const struct file_operations debug_registers_fops = { | |
332 | .owner = THIS_MODULE, | |
333 | .open = debug_registers_open, | |
334 | .read = debug_output, | |
335 | .release = debug_close, | |
336 | .llseek = default_llseek, | |
337 | }; | |
338 | ||
339 | static struct dentry *fotg210_debug_root; | |
340 | ||
341 | struct debug_buffer { | |
342 | ssize_t (*fill_func)(struct debug_buffer *); /* fill method */ | |
343 | struct usb_bus *bus; | |
344 | struct mutex mutex; /* protect filling of buffer */ | |
345 | size_t count; /* number of characters filled into buffer */ | |
346 | char *output_buf; | |
347 | size_t alloc_size; | |
348 | }; | |
349 | ||
350 | #define speed_char(info1)({ char tmp; \ | |
351 | switch (info1 & (3 << 12)) { \ | |
352 | case QH_FULL_SPEED: \ | |
353 | tmp = 'f'; break; \ | |
354 | case QH_LOW_SPEED: \ | |
355 | tmp = 'l'; break; \ | |
356 | case QH_HIGH_SPEED: \ | |
357 | tmp = 'h'; break; \ | |
358 | default: \ | |
359 | tmp = '?'; break; \ | |
2b84f92b | 360 | } tmp; }) |
7d50195f FHC |
361 | |
362 | static inline char token_mark(struct fotg210_hcd *fotg210, __hc32 token) | |
363 | { | |
364 | __u32 v = hc32_to_cpu(fotg210, token); | |
365 | ||
366 | if (v & QTD_STS_ACTIVE) | |
367 | return '*'; | |
368 | if (v & QTD_STS_HALT) | |
369 | return '-'; | |
370 | if (!IS_SHORT_READ(v)) | |
371 | return ' '; | |
372 | /* tries to advance through hw_alt_next */ | |
373 | return '/'; | |
374 | } | |
375 | ||
376 | static void qh_lines( | |
377 | struct fotg210_hcd *fotg210, | |
378 | struct fotg210_qh *qh, | |
379 | char **nextp, | |
380 | unsigned *sizep | |
381 | ) | |
382 | { | |
383 | u32 scratch; | |
384 | u32 hw_curr; | |
385 | struct fotg210_qtd *td; | |
386 | unsigned temp; | |
387 | unsigned size = *sizep; | |
388 | char *next = *nextp; | |
389 | char mark; | |
390 | __le32 list_end = FOTG210_LIST_END(fotg210); | |
391 | struct fotg210_qh_hw *hw = qh->hw; | |
392 | ||
393 | if (hw->hw_qtd_next == list_end) /* NEC does this */ | |
394 | mark = '@'; | |
395 | else | |
396 | mark = token_mark(fotg210, hw->hw_token); | |
397 | if (mark == '/') { /* qh_alt_next controls qh advance? */ | |
398 | if ((hw->hw_alt_next & QTD_MASK(fotg210)) | |
399 | == fotg210->async->hw->hw_alt_next) | |
400 | mark = '#'; /* blocked */ | |
401 | else if (hw->hw_alt_next == list_end) | |
402 | mark = '.'; /* use hw_qtd_next */ | |
403 | /* else alt_next points to some other qtd */ | |
404 | } | |
405 | scratch = hc32_to_cpup(fotg210, &hw->hw_info1); | |
406 | hw_curr = (mark == '*') ? hc32_to_cpup(fotg210, &hw->hw_current) : 0; | |
407 | temp = scnprintf(next, size, | |
408 | "qh/%p dev%d %cs ep%d %08x %08x(%08x%c %s nak%d)", | |
409 | qh, scratch & 0x007f, | |
410 | speed_char(scratch), | |
411 | (scratch >> 8) & 0x000f, | |
412 | scratch, hc32_to_cpup(fotg210, &hw->hw_info2), | |
413 | hc32_to_cpup(fotg210, &hw->hw_token), mark, | |
414 | (cpu_to_hc32(fotg210, QTD_TOGGLE) & hw->hw_token) | |
415 | ? "data1" : "data0", | |
416 | (hc32_to_cpup(fotg210, &hw->hw_alt_next) >> 1) & 0x0f); | |
417 | size -= temp; | |
418 | next += temp; | |
419 | ||
420 | /* hc may be modifying the list as we read it ... */ | |
421 | list_for_each_entry(td, &qh->qtd_list, qtd_list) { | |
422 | scratch = hc32_to_cpup(fotg210, &td->hw_token); | |
423 | mark = ' '; | |
424 | if (hw_curr == td->qtd_dma) | |
425 | mark = '*'; | |
426 | else if (hw->hw_qtd_next == cpu_to_hc32(fotg210, td->qtd_dma)) | |
427 | mark = '+'; | |
428 | else if (QTD_LENGTH(scratch)) { | |
429 | if (td->hw_alt_next == fotg210->async->hw->hw_alt_next) | |
430 | mark = '#'; | |
431 | else if (td->hw_alt_next != list_end) | |
432 | mark = '/'; | |
433 | } | |
434 | temp = snprintf(next, size, | |
435 | "\n\t%p%c%s len=%d %08x urb %p", | |
436 | td, mark, ({ char *tmp; | |
437 | switch ((scratch>>8)&0x03) { | |
438 | case 0: | |
439 | tmp = "out"; | |
440 | break; | |
441 | case 1: | |
442 | tmp = "in"; | |
443 | break; | |
444 | case 2: | |
445 | tmp = "setup"; | |
446 | break; | |
447 | default: | |
448 | tmp = "?"; | |
449 | break; | |
450 | } tmp; }), | |
451 | (scratch >> 16) & 0x7fff, | |
452 | scratch, | |
453 | td->urb); | |
454 | if (size < temp) | |
455 | temp = size; | |
456 | size -= temp; | |
457 | next += temp; | |
458 | if (temp == size) | |
459 | goto done; | |
460 | } | |
461 | ||
462 | temp = snprintf(next, size, "\n"); | |
463 | if (size < temp) | |
464 | temp = size; | |
465 | size -= temp; | |
466 | next += temp; | |
467 | ||
468 | done: | |
469 | *sizep = size; | |
470 | *nextp = next; | |
471 | } | |
472 | ||
473 | static ssize_t fill_async_buffer(struct debug_buffer *buf) | |
474 | { | |
475 | struct usb_hcd *hcd; | |
476 | struct fotg210_hcd *fotg210; | |
477 | unsigned long flags; | |
478 | unsigned temp, size; | |
479 | char *next; | |
480 | struct fotg210_qh *qh; | |
481 | ||
482 | hcd = bus_to_hcd(buf->bus); | |
483 | fotg210 = hcd_to_fotg210(hcd); | |
484 | next = buf->output_buf; | |
485 | size = buf->alloc_size; | |
486 | ||
487 | *next = 0; | |
488 | ||
489 | /* dumps a snapshot of the async schedule. | |
490 | * usually empty except for long-term bulk reads, or head. | |
491 | * one QH per line, and TDs we know about | |
492 | */ | |
493 | spin_lock_irqsave(&fotg210->lock, flags); | |
494 | for (qh = fotg210->async->qh_next.qh; size > 0 && qh; | |
495 | qh = qh->qh_next.qh) | |
496 | qh_lines(fotg210, qh, &next, &size); | |
497 | if (fotg210->async_unlink && size > 0) { | |
498 | temp = scnprintf(next, size, "\nunlink =\n"); | |
499 | size -= temp; | |
500 | next += temp; | |
501 | ||
502 | for (qh = fotg210->async_unlink; size > 0 && qh; | |
503 | qh = qh->unlink_next) | |
504 | qh_lines(fotg210, qh, &next, &size); | |
505 | } | |
506 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
507 | ||
508 | return strlen(buf->output_buf); | |
509 | } | |
510 | ||
511 | #define DBG_SCHED_LIMIT 64 | |
512 | static ssize_t fill_periodic_buffer(struct debug_buffer *buf) | |
513 | { | |
514 | struct usb_hcd *hcd; | |
515 | struct fotg210_hcd *fotg210; | |
516 | unsigned long flags; | |
517 | union fotg210_shadow p, *seen; | |
518 | unsigned temp, size, seen_count; | |
519 | char *next; | |
520 | unsigned i; | |
521 | __hc32 tag; | |
522 | ||
523 | seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC); | |
524 | if (!seen) | |
525 | return 0; | |
526 | seen_count = 0; | |
527 | ||
528 | hcd = bus_to_hcd(buf->bus); | |
529 | fotg210 = hcd_to_fotg210(hcd); | |
530 | next = buf->output_buf; | |
531 | size = buf->alloc_size; | |
532 | ||
533 | temp = scnprintf(next, size, "size = %d\n", fotg210->periodic_size); | |
534 | size -= temp; | |
535 | next += temp; | |
536 | ||
537 | /* dump a snapshot of the periodic schedule. | |
538 | * iso changes, interrupt usually doesn't. | |
539 | */ | |
540 | spin_lock_irqsave(&fotg210->lock, flags); | |
541 | for (i = 0; i < fotg210->periodic_size; i++) { | |
542 | p = fotg210->pshadow[i]; | |
543 | if (likely(!p.ptr)) | |
544 | continue; | |
545 | tag = Q_NEXT_TYPE(fotg210, fotg210->periodic[i]); | |
546 | ||
547 | temp = scnprintf(next, size, "%4d: ", i); | |
548 | size -= temp; | |
549 | next += temp; | |
550 | ||
551 | do { | |
552 | struct fotg210_qh_hw *hw; | |
553 | ||
554 | switch (hc32_to_cpu(fotg210, tag)) { | |
555 | case Q_TYPE_QH: | |
556 | hw = p.qh->hw; | |
557 | temp = scnprintf(next, size, " qh%d-%04x/%p", | |
558 | p.qh->period, | |
559 | hc32_to_cpup(fotg210, | |
560 | &hw->hw_info2) | |
561 | /* uframe masks */ | |
562 | & (QH_CMASK | QH_SMASK), | |
563 | p.qh); | |
564 | size -= temp; | |
565 | next += temp; | |
566 | /* don't repeat what follows this qh */ | |
567 | for (temp = 0; temp < seen_count; temp++) { | |
568 | if (seen[temp].ptr != p.ptr) | |
569 | continue; | |
570 | if (p.qh->qh_next.ptr) { | |
571 | temp = scnprintf(next, size, | |
572 | " ..."); | |
573 | size -= temp; | |
574 | next += temp; | |
575 | } | |
576 | break; | |
577 | } | |
578 | /* show more info the first time around */ | |
579 | if (temp == seen_count) { | |
580 | u32 scratch = hc32_to_cpup(fotg210, | |
581 | &hw->hw_info1); | |
582 | struct fotg210_qtd *qtd; | |
583 | char *type = ""; | |
584 | ||
585 | /* count tds, get ep direction */ | |
586 | temp = 0; | |
587 | list_for_each_entry(qtd, | |
588 | &p.qh->qtd_list, | |
589 | qtd_list) { | |
590 | temp++; | |
591 | switch (0x03 & (hc32_to_cpu( | |
592 | fotg210, | |
593 | qtd->hw_token) >> 8)) { | |
594 | case 0: | |
595 | type = "out"; | |
596 | continue; | |
597 | case 1: | |
598 | type = "in"; | |
599 | continue; | |
600 | } | |
601 | } | |
602 | ||
603 | temp = scnprintf(next, size, | |
604 | "(%c%d ep%d%s " | |
605 | "[%d/%d] q%d p%d)", | |
606 | speed_char(scratch), | |
607 | scratch & 0x007f, | |
608 | (scratch >> 8) & 0x000f, type, | |
609 | p.qh->usecs, p.qh->c_usecs, | |
610 | temp, | |
611 | 0x7ff & (scratch >> 16)); | |
612 | ||
613 | if (seen_count < DBG_SCHED_LIMIT) | |
614 | seen[seen_count++].qh = p.qh; | |
615 | } else | |
616 | temp = 0; | |
617 | tag = Q_NEXT_TYPE(fotg210, hw->hw_next); | |
618 | p = p.qh->qh_next; | |
619 | break; | |
620 | case Q_TYPE_FSTN: | |
621 | temp = scnprintf(next, size, | |
622 | " fstn-%8x/%p", p.fstn->hw_prev, | |
623 | p.fstn); | |
624 | tag = Q_NEXT_TYPE(fotg210, p.fstn->hw_next); | |
625 | p = p.fstn->fstn_next; | |
626 | break; | |
627 | case Q_TYPE_ITD: | |
628 | temp = scnprintf(next, size, | |
629 | " itd/%p", p.itd); | |
630 | tag = Q_NEXT_TYPE(fotg210, p.itd->hw_next); | |
631 | p = p.itd->itd_next; | |
632 | break; | |
633 | } | |
634 | size -= temp; | |
635 | next += temp; | |
636 | } while (p.ptr); | |
637 | ||
638 | temp = scnprintf(next, size, "\n"); | |
639 | size -= temp; | |
640 | next += temp; | |
641 | } | |
642 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
643 | kfree(seen); | |
644 | ||
645 | return buf->alloc_size - size; | |
646 | } | |
647 | #undef DBG_SCHED_LIMIT | |
648 | ||
649 | static const char *rh_state_string(struct fotg210_hcd *fotg210) | |
650 | { | |
651 | switch (fotg210->rh_state) { | |
652 | case FOTG210_RH_HALTED: | |
653 | return "halted"; | |
654 | case FOTG210_RH_SUSPENDED: | |
655 | return "suspended"; | |
656 | case FOTG210_RH_RUNNING: | |
657 | return "running"; | |
658 | case FOTG210_RH_STOPPING: | |
659 | return "stopping"; | |
660 | } | |
661 | return "?"; | |
662 | } | |
663 | ||
664 | static ssize_t fill_registers_buffer(struct debug_buffer *buf) | |
665 | { | |
666 | struct usb_hcd *hcd; | |
667 | struct fotg210_hcd *fotg210; | |
668 | unsigned long flags; | |
669 | unsigned temp, size, i; | |
670 | char *next, scratch[80]; | |
671 | static const char fmt[] = "%*s\n"; | |
672 | static const char label[] = ""; | |
673 | ||
674 | hcd = bus_to_hcd(buf->bus); | |
675 | fotg210 = hcd_to_fotg210(hcd); | |
676 | next = buf->output_buf; | |
677 | size = buf->alloc_size; | |
678 | ||
679 | spin_lock_irqsave(&fotg210->lock, flags); | |
680 | ||
681 | if (!HCD_HW_ACCESSIBLE(hcd)) { | |
682 | size = scnprintf(next, size, | |
683 | "bus %s, device %s\n" | |
684 | "%s\n" | |
685 | "SUSPENDED(no register access)\n", | |
686 | hcd->self.controller->bus->name, | |
687 | dev_name(hcd->self.controller), | |
688 | hcd->product_desc); | |
689 | goto done; | |
690 | } | |
691 | ||
692 | /* Capability Registers */ | |
693 | i = HC_VERSION(fotg210, fotg210_readl(fotg210, | |
694 | &fotg210->caps->hc_capbase)); | |
695 | temp = scnprintf(next, size, | |
696 | "bus %s, device %s\n" | |
697 | "%s\n" | |
698 | "EHCI %x.%02x, rh state %s\n", | |
699 | hcd->self.controller->bus->name, | |
700 | dev_name(hcd->self.controller), | |
701 | hcd->product_desc, | |
702 | i >> 8, i & 0x0ff, rh_state_string(fotg210)); | |
703 | size -= temp; | |
704 | next += temp; | |
705 | ||
706 | /* FIXME interpret both types of params */ | |
707 | i = fotg210_readl(fotg210, &fotg210->caps->hcs_params); | |
708 | temp = scnprintf(next, size, "structural params 0x%08x\n", i); | |
709 | size -= temp; | |
710 | next += temp; | |
711 | ||
712 | i = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
713 | temp = scnprintf(next, size, "capability params 0x%08x\n", i); | |
714 | size -= temp; | |
715 | next += temp; | |
716 | ||
717 | /* Operational Registers */ | |
718 | temp = dbg_status_buf(scratch, sizeof(scratch), label, | |
719 | fotg210_readl(fotg210, &fotg210->regs->status)); | |
720 | temp = scnprintf(next, size, fmt, temp, scratch); | |
721 | size -= temp; | |
722 | next += temp; | |
723 | ||
724 | temp = dbg_command_buf(scratch, sizeof(scratch), label, | |
725 | fotg210_readl(fotg210, &fotg210->regs->command)); | |
726 | temp = scnprintf(next, size, fmt, temp, scratch); | |
727 | size -= temp; | |
728 | next += temp; | |
729 | ||
730 | temp = dbg_intr_buf(scratch, sizeof(scratch), label, | |
731 | fotg210_readl(fotg210, &fotg210->regs->intr_enable)); | |
732 | temp = scnprintf(next, size, fmt, temp, scratch); | |
733 | size -= temp; | |
734 | next += temp; | |
735 | ||
736 | temp = scnprintf(next, size, "uframe %04x\n", | |
737 | fotg210_read_frame_index(fotg210)); | |
738 | size -= temp; | |
739 | next += temp; | |
740 | ||
741 | if (fotg210->async_unlink) { | |
742 | temp = scnprintf(next, size, "async unlink qh %p\n", | |
743 | fotg210->async_unlink); | |
744 | size -= temp; | |
745 | next += temp; | |
746 | } | |
747 | ||
748 | #ifdef FOTG210_STATS | |
749 | temp = scnprintf(next, size, | |
750 | "irq normal %ld err %ld iaa %ld(lost %ld)\n", | |
751 | fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa, | |
752 | fotg210->stats.lost_iaa); | |
753 | size -= temp; | |
754 | next += temp; | |
755 | ||
756 | temp = scnprintf(next, size, "complete %ld unlink %ld\n", | |
757 | fotg210->stats.complete, fotg210->stats.unlink); | |
758 | size -= temp; | |
759 | next += temp; | |
760 | #endif | |
761 | ||
762 | done: | |
763 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
764 | ||
765 | return buf->alloc_size - size; | |
766 | } | |
767 | ||
768 | static struct debug_buffer *alloc_buffer(struct usb_bus *bus, | |
769 | ssize_t (*fill_func)(struct debug_buffer *)) | |
770 | { | |
771 | struct debug_buffer *buf; | |
772 | ||
773 | buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL); | |
774 | ||
775 | if (buf) { | |
776 | buf->bus = bus; | |
777 | buf->fill_func = fill_func; | |
778 | mutex_init(&buf->mutex); | |
779 | buf->alloc_size = PAGE_SIZE; | |
780 | } | |
781 | ||
782 | return buf; | |
783 | } | |
784 | ||
785 | static int fill_buffer(struct debug_buffer *buf) | |
786 | { | |
787 | int ret = 0; | |
788 | ||
789 | if (!buf->output_buf) | |
790 | buf->output_buf = vmalloc(buf->alloc_size); | |
791 | ||
792 | if (!buf->output_buf) { | |
793 | ret = -ENOMEM; | |
794 | goto out; | |
795 | } | |
796 | ||
797 | ret = buf->fill_func(buf); | |
798 | ||
799 | if (ret >= 0) { | |
800 | buf->count = ret; | |
801 | ret = 0; | |
802 | } | |
803 | ||
804 | out: | |
805 | return ret; | |
806 | } | |
807 | ||
808 | static ssize_t debug_output(struct file *file, char __user *user_buf, | |
809 | size_t len, loff_t *offset) | |
810 | { | |
811 | struct debug_buffer *buf = file->private_data; | |
812 | int ret = 0; | |
813 | ||
814 | mutex_lock(&buf->mutex); | |
815 | if (buf->count == 0) { | |
816 | ret = fill_buffer(buf); | |
817 | if (ret != 0) { | |
818 | mutex_unlock(&buf->mutex); | |
819 | goto out; | |
820 | } | |
821 | } | |
822 | mutex_unlock(&buf->mutex); | |
823 | ||
824 | ret = simple_read_from_buffer(user_buf, len, offset, | |
825 | buf->output_buf, buf->count); | |
826 | ||
827 | out: | |
828 | return ret; | |
829 | ||
830 | } | |
831 | ||
832 | static int debug_close(struct inode *inode, struct file *file) | |
833 | { | |
834 | struct debug_buffer *buf = file->private_data; | |
835 | ||
836 | if (buf) { | |
837 | vfree(buf->output_buf); | |
838 | kfree(buf); | |
839 | } | |
840 | ||
841 | return 0; | |
842 | } | |
843 | static int debug_async_open(struct inode *inode, struct file *file) | |
844 | { | |
845 | file->private_data = alloc_buffer(inode->i_private, fill_async_buffer); | |
846 | ||
847 | return file->private_data ? 0 : -ENOMEM; | |
848 | } | |
849 | ||
850 | static int debug_periodic_open(struct inode *inode, struct file *file) | |
851 | { | |
852 | struct debug_buffer *buf; | |
853 | buf = alloc_buffer(inode->i_private, fill_periodic_buffer); | |
854 | if (!buf) | |
855 | return -ENOMEM; | |
856 | ||
857 | buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE; | |
858 | file->private_data = buf; | |
859 | return 0; | |
860 | } | |
861 | ||
862 | static int debug_registers_open(struct inode *inode, struct file *file) | |
863 | { | |
864 | file->private_data = alloc_buffer(inode->i_private, | |
865 | fill_registers_buffer); | |
866 | ||
867 | return file->private_data ? 0 : -ENOMEM; | |
868 | } | |
869 | ||
870 | static inline void create_debug_files(struct fotg210_hcd *fotg210) | |
871 | { | |
872 | struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self; | |
873 | ||
874 | fotg210->debug_dir = debugfs_create_dir(bus->bus_name, | |
875 | fotg210_debug_root); | |
876 | if (!fotg210->debug_dir) | |
877 | return; | |
878 | ||
879 | if (!debugfs_create_file("async", S_IRUGO, fotg210->debug_dir, bus, | |
880 | &debug_async_fops)) | |
881 | goto file_error; | |
882 | ||
883 | if (!debugfs_create_file("periodic", S_IRUGO, fotg210->debug_dir, bus, | |
884 | &debug_periodic_fops)) | |
885 | goto file_error; | |
886 | ||
887 | if (!debugfs_create_file("registers", S_IRUGO, fotg210->debug_dir, bus, | |
888 | &debug_registers_fops)) | |
889 | goto file_error; | |
890 | ||
891 | return; | |
892 | ||
893 | file_error: | |
894 | debugfs_remove_recursive(fotg210->debug_dir); | |
895 | } | |
896 | ||
897 | static inline void remove_debug_files(struct fotg210_hcd *fotg210) | |
898 | { | |
899 | debugfs_remove_recursive(fotg210->debug_dir); | |
900 | } | |
901 | ||
7d50195f FHC |
902 | /*-------------------------------------------------------------------------*/ |
903 | ||
904 | /* | |
905 | * handshake - spin reading hc until handshake completes or fails | |
906 | * @ptr: address of hc register to be read | |
907 | * @mask: bits to look at in result of read | |
908 | * @done: value of those bits when handshake succeeds | |
909 | * @usec: timeout in microseconds | |
910 | * | |
911 | * Returns negative errno, or zero on success | |
912 | * | |
913 | * Success happens when the "mask" bits have the specified value (hardware | |
914 | * handshake done). There are two failure modes: "usec" have passed (major | |
915 | * hardware flakeout), or the register reads as all-ones (hardware removed). | |
916 | * | |
917 | * That last failure should_only happen in cases like physical cardbus eject | |
918 | * before driver shutdown. But it also seems to be caused by bugs in cardbus | |
919 | * bridge shutdown: shutting down the bridge before the devices using it. | |
920 | */ | |
921 | static int handshake(struct fotg210_hcd *fotg210, void __iomem *ptr, | |
922 | u32 mask, u32 done, int usec) | |
923 | { | |
924 | u32 result; | |
925 | ||
926 | do { | |
927 | result = fotg210_readl(fotg210, ptr); | |
928 | if (result == ~(u32)0) /* card removed */ | |
929 | return -ENODEV; | |
930 | result &= mask; | |
931 | if (result == done) | |
932 | return 0; | |
933 | udelay(1); | |
934 | usec--; | |
935 | } while (usec > 0); | |
936 | return -ETIMEDOUT; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Force HC to halt state from unknown (EHCI spec section 2.3). | |
941 | * Must be called with interrupts enabled and the lock not held. | |
942 | */ | |
943 | static int fotg210_halt(struct fotg210_hcd *fotg210) | |
944 | { | |
945 | u32 temp; | |
946 | ||
947 | spin_lock_irq(&fotg210->lock); | |
948 | ||
949 | /* disable any irqs left enabled by previous code */ | |
950 | fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); | |
951 | ||
952 | /* | |
953 | * This routine gets called during probe before fotg210->command | |
954 | * has been initialized, so we can't rely on its value. | |
955 | */ | |
956 | fotg210->command &= ~CMD_RUN; | |
957 | temp = fotg210_readl(fotg210, &fotg210->regs->command); | |
958 | temp &= ~(CMD_RUN | CMD_IAAD); | |
959 | fotg210_writel(fotg210, temp, &fotg210->regs->command); | |
960 | ||
961 | spin_unlock_irq(&fotg210->lock); | |
962 | synchronize_irq(fotg210_to_hcd(fotg210)->irq); | |
963 | ||
964 | return handshake(fotg210, &fotg210->regs->status, | |
965 | STS_HALT, STS_HALT, 16 * 125); | |
966 | } | |
967 | ||
968 | /* | |
969 | * Reset a non-running (STS_HALT == 1) controller. | |
970 | * Must be called with interrupts enabled and the lock not held. | |
971 | */ | |
972 | static int fotg210_reset(struct fotg210_hcd *fotg210) | |
973 | { | |
974 | int retval; | |
975 | u32 command = fotg210_readl(fotg210, &fotg210->regs->command); | |
976 | ||
977 | /* If the EHCI debug controller is active, special care must be | |
978 | * taken before and after a host controller reset */ | |
979 | if (fotg210->debug && !dbgp_reset_prep(fotg210_to_hcd(fotg210))) | |
980 | fotg210->debug = NULL; | |
981 | ||
982 | command |= CMD_RESET; | |
983 | dbg_cmd(fotg210, "reset", command); | |
984 | fotg210_writel(fotg210, command, &fotg210->regs->command); | |
985 | fotg210->rh_state = FOTG210_RH_HALTED; | |
986 | fotg210->next_statechange = jiffies; | |
987 | retval = handshake(fotg210, &fotg210->regs->command, | |
988 | CMD_RESET, 0, 250 * 1000); | |
989 | ||
990 | if (retval) | |
991 | return retval; | |
992 | ||
993 | if (fotg210->debug) | |
994 | dbgp_external_startup(fotg210_to_hcd(fotg210)); | |
995 | ||
996 | fotg210->port_c_suspend = fotg210->suspended_ports = | |
997 | fotg210->resuming_ports = 0; | |
998 | return retval; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Idle the controller (turn off the schedules). | |
1003 | * Must be called with interrupts enabled and the lock not held. | |
1004 | */ | |
1005 | static void fotg210_quiesce(struct fotg210_hcd *fotg210) | |
1006 | { | |
1007 | u32 temp; | |
1008 | ||
1009 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1010 | return; | |
1011 | ||
1012 | /* wait for any schedule enables/disables to take effect */ | |
1013 | temp = (fotg210->command << 10) & (STS_ASS | STS_PSS); | |
1014 | handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, temp, | |
1015 | 16 * 125); | |
1016 | ||
1017 | /* then disable anything that's still active */ | |
1018 | spin_lock_irq(&fotg210->lock); | |
1019 | fotg210->command &= ~(CMD_ASE | CMD_PSE); | |
1020 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
1021 | spin_unlock_irq(&fotg210->lock); | |
1022 | ||
1023 | /* hardware can take 16 microframes to turn off ... */ | |
1024 | handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, 0, | |
1025 | 16 * 125); | |
1026 | } | |
1027 | ||
1028 | /*-------------------------------------------------------------------------*/ | |
1029 | ||
1030 | static void end_unlink_async(struct fotg210_hcd *fotg210); | |
1031 | static void unlink_empty_async(struct fotg210_hcd *fotg210); | |
1032 | static void fotg210_work(struct fotg210_hcd *fotg210); | |
1033 | static void start_unlink_intr(struct fotg210_hcd *fotg210, | |
1034 | struct fotg210_qh *qh); | |
1035 | static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); | |
1036 | ||
1037 | /*-------------------------------------------------------------------------*/ | |
1038 | ||
1039 | /* Set a bit in the USBCMD register */ | |
1040 | static void fotg210_set_command_bit(struct fotg210_hcd *fotg210, u32 bit) | |
1041 | { | |
1042 | fotg210->command |= bit; | |
1043 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
1044 | ||
1045 | /* unblock posted write */ | |
1046 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1047 | } | |
1048 | ||
1049 | /* Clear a bit in the USBCMD register */ | |
1050 | static void fotg210_clear_command_bit(struct fotg210_hcd *fotg210, u32 bit) | |
1051 | { | |
1052 | fotg210->command &= ~bit; | |
1053 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
1054 | ||
1055 | /* unblock posted write */ | |
1056 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1057 | } | |
1058 | ||
1059 | /*-------------------------------------------------------------------------*/ | |
1060 | ||
1061 | /* | |
1062 | * EHCI timer support... Now using hrtimers. | |
1063 | * | |
1064 | * Lots of different events are triggered from fotg210->hrtimer. Whenever | |
1065 | * the timer routine runs, it checks each possible event; events that are | |
1066 | * currently enabled and whose expiration time has passed get handled. | |
1067 | * The set of enabled events is stored as a collection of bitflags in | |
1068 | * fotg210->enabled_hrtimer_events, and they are numbered in order of | |
1069 | * increasing delay values (ranging between 1 ms and 100 ms). | |
1070 | * | |
1071 | * Rather than implementing a sorted list or tree of all pending events, | |
1072 | * we keep track only of the lowest-numbered pending event, in | |
1073 | * fotg210->next_hrtimer_event. Whenever fotg210->hrtimer gets restarted, its | |
1074 | * expiration time is set to the timeout value for this event. | |
1075 | * | |
1076 | * As a result, events might not get handled right away; the actual delay | |
1077 | * could be anywhere up to twice the requested delay. This doesn't | |
1078 | * matter, because none of the events are especially time-critical. The | |
1079 | * ones that matter most all have a delay of 1 ms, so they will be | |
1080 | * handled after 2 ms at most, which is okay. In addition to this, we | |
1081 | * allow for an expiration range of 1 ms. | |
1082 | */ | |
1083 | ||
1084 | /* | |
1085 | * Delay lengths for the hrtimer event types. | |
1086 | * Keep this list sorted by delay length, in the same order as | |
1087 | * the event types indexed by enum fotg210_hrtimer_event in fotg210.h. | |
1088 | */ | |
1089 | static unsigned event_delays_ns[] = { | |
1090 | 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_ASS */ | |
1091 | 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_PSS */ | |
1092 | 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_DEAD */ | |
1093 | 1125 * NSEC_PER_USEC, /* FOTG210_HRTIMER_UNLINK_INTR */ | |
1094 | 2 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_FREE_ITDS */ | |
1095 | 6 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_ASYNC_UNLINKS */ | |
1096 | 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IAA_WATCHDOG */ | |
1097 | 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_PERIODIC */ | |
1098 | 15 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_ASYNC */ | |
1099 | 100 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IO_WATCHDOG */ | |
1100 | }; | |
1101 | ||
1102 | /* Enable a pending hrtimer event */ | |
1103 | static void fotg210_enable_event(struct fotg210_hcd *fotg210, unsigned event, | |
1104 | bool resched) | |
1105 | { | |
1106 | ktime_t *timeout = &fotg210->hr_timeouts[event]; | |
1107 | ||
1108 | if (resched) | |
1109 | *timeout = ktime_add(ktime_get(), | |
1110 | ktime_set(0, event_delays_ns[event])); | |
1111 | fotg210->enabled_hrtimer_events |= (1 << event); | |
1112 | ||
1113 | /* Track only the lowest-numbered pending event */ | |
1114 | if (event < fotg210->next_hrtimer_event) { | |
1115 | fotg210->next_hrtimer_event = event; | |
1116 | hrtimer_start_range_ns(&fotg210->hrtimer, *timeout, | |
1117 | NSEC_PER_MSEC, HRTIMER_MODE_ABS); | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | ||
1122 | /* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */ | |
1123 | static void fotg210_poll_ASS(struct fotg210_hcd *fotg210) | |
1124 | { | |
1125 | unsigned actual, want; | |
1126 | ||
1127 | /* Don't enable anything if the controller isn't running (e.g., died) */ | |
1128 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1129 | return; | |
1130 | ||
1131 | want = (fotg210->command & CMD_ASE) ? STS_ASS : 0; | |
1132 | actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_ASS; | |
1133 | ||
1134 | if (want != actual) { | |
1135 | ||
1136 | /* Poll again later, but give up after about 20 ms */ | |
1137 | if (fotg210->ASS_poll_count++ < 20) { | |
1138 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_ASS, | |
1139 | true); | |
1140 | return; | |
1141 | } | |
1142 | fotg210_dbg(fotg210, "Waited too long for the async schedule status (%x/%x), giving up\n", | |
1143 | want, actual); | |
1144 | } | |
1145 | fotg210->ASS_poll_count = 0; | |
1146 | ||
1147 | /* The status is up-to-date; restart or stop the schedule as needed */ | |
1148 | if (want == 0) { /* Stopped */ | |
1149 | if (fotg210->async_count > 0) | |
1150 | fotg210_set_command_bit(fotg210, CMD_ASE); | |
1151 | ||
1152 | } else { /* Running */ | |
1153 | if (fotg210->async_count == 0) { | |
1154 | ||
1155 | /* Turn off the schedule after a while */ | |
1156 | fotg210_enable_event(fotg210, | |
1157 | FOTG210_HRTIMER_DISABLE_ASYNC, | |
1158 | true); | |
1159 | } | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | /* Turn off the async schedule after a brief delay */ | |
1164 | static void fotg210_disable_ASE(struct fotg210_hcd *fotg210) | |
1165 | { | |
1166 | fotg210_clear_command_bit(fotg210, CMD_ASE); | |
1167 | } | |
1168 | ||
1169 | ||
1170 | /* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */ | |
1171 | static void fotg210_poll_PSS(struct fotg210_hcd *fotg210) | |
1172 | { | |
1173 | unsigned actual, want; | |
1174 | ||
1175 | /* Don't do anything if the controller isn't running (e.g., died) */ | |
1176 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1177 | return; | |
1178 | ||
1179 | want = (fotg210->command & CMD_PSE) ? STS_PSS : 0; | |
1180 | actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_PSS; | |
1181 | ||
1182 | if (want != actual) { | |
1183 | ||
1184 | /* Poll again later, but give up after about 20 ms */ | |
1185 | if (fotg210->PSS_poll_count++ < 20) { | |
1186 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_PSS, | |
1187 | true); | |
1188 | return; | |
1189 | } | |
1190 | fotg210_dbg(fotg210, "Waited too long for the periodic schedule status (%x/%x), giving up\n", | |
1191 | want, actual); | |
1192 | } | |
1193 | fotg210->PSS_poll_count = 0; | |
1194 | ||
1195 | /* The status is up-to-date; restart or stop the schedule as needed */ | |
1196 | if (want == 0) { /* Stopped */ | |
1197 | if (fotg210->periodic_count > 0) | |
1198 | fotg210_set_command_bit(fotg210, CMD_PSE); | |
1199 | ||
1200 | } else { /* Running */ | |
1201 | if (fotg210->periodic_count == 0) { | |
1202 | ||
1203 | /* Turn off the schedule after a while */ | |
1204 | fotg210_enable_event(fotg210, | |
1205 | FOTG210_HRTIMER_DISABLE_PERIODIC, | |
1206 | true); | |
1207 | } | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | /* Turn off the periodic schedule after a brief delay */ | |
1212 | static void fotg210_disable_PSE(struct fotg210_hcd *fotg210) | |
1213 | { | |
1214 | fotg210_clear_command_bit(fotg210, CMD_PSE); | |
1215 | } | |
1216 | ||
1217 | ||
1218 | /* Poll the STS_HALT status bit; see when a dead controller stops */ | |
1219 | static void fotg210_handle_controller_death(struct fotg210_hcd *fotg210) | |
1220 | { | |
1221 | if (!(fotg210_readl(fotg210, &fotg210->regs->status) & STS_HALT)) { | |
1222 | ||
1223 | /* Give up after a few milliseconds */ | |
1224 | if (fotg210->died_poll_count++ < 5) { | |
1225 | /* Try again later */ | |
1226 | fotg210_enable_event(fotg210, | |
1227 | FOTG210_HRTIMER_POLL_DEAD, true); | |
1228 | return; | |
1229 | } | |
1230 | fotg210_warn(fotg210, "Waited too long for the controller to stop, giving up\n"); | |
1231 | } | |
1232 | ||
1233 | /* Clean up the mess */ | |
1234 | fotg210->rh_state = FOTG210_RH_HALTED; | |
1235 | fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); | |
1236 | fotg210_work(fotg210); | |
1237 | end_unlink_async(fotg210); | |
1238 | ||
1239 | /* Not in process context, so don't try to reset the controller */ | |
1240 | } | |
1241 | ||
1242 | ||
1243 | /* Handle unlinked interrupt QHs once they are gone from the hardware */ | |
1244 | static void fotg210_handle_intr_unlinks(struct fotg210_hcd *fotg210) | |
1245 | { | |
1246 | bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING); | |
1247 | ||
1248 | /* | |
1249 | * Process all the QHs on the intr_unlink list that were added | |
1250 | * before the current unlink cycle began. The list is in | |
1251 | * temporal order, so stop when we reach the first entry in the | |
1252 | * current cycle. But if the root hub isn't running then | |
1253 | * process all the QHs on the list. | |
1254 | */ | |
1255 | fotg210->intr_unlinking = true; | |
1256 | while (fotg210->intr_unlink) { | |
1257 | struct fotg210_qh *qh = fotg210->intr_unlink; | |
1258 | ||
1259 | if (!stopped && qh->unlink_cycle == fotg210->intr_unlink_cycle) | |
1260 | break; | |
1261 | fotg210->intr_unlink = qh->unlink_next; | |
1262 | qh->unlink_next = NULL; | |
1263 | end_unlink_intr(fotg210, qh); | |
1264 | } | |
1265 | ||
1266 | /* Handle remaining entries later */ | |
1267 | if (fotg210->intr_unlink) { | |
1268 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR, | |
1269 | true); | |
1270 | ++fotg210->intr_unlink_cycle; | |
1271 | } | |
1272 | fotg210->intr_unlinking = false; | |
1273 | } | |
1274 | ||
1275 | ||
1276 | /* Start another free-iTDs/siTDs cycle */ | |
1277 | static void start_free_itds(struct fotg210_hcd *fotg210) | |
1278 | { | |
1279 | if (!(fotg210->enabled_hrtimer_events & | |
1280 | BIT(FOTG210_HRTIMER_FREE_ITDS))) { | |
1281 | fotg210->last_itd_to_free = list_entry( | |
1282 | fotg210->cached_itd_list.prev, | |
1283 | struct fotg210_itd, itd_list); | |
1284 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_FREE_ITDS, true); | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | /* Wait for controller to stop using old iTDs and siTDs */ | |
1289 | static void end_free_itds(struct fotg210_hcd *fotg210) | |
1290 | { | |
1291 | struct fotg210_itd *itd, *n; | |
1292 | ||
1293 | if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
1294 | fotg210->last_itd_to_free = NULL; | |
1295 | ||
1296 | list_for_each_entry_safe(itd, n, &fotg210->cached_itd_list, itd_list) { | |
1297 | list_del(&itd->itd_list); | |
1298 | dma_pool_free(fotg210->itd_pool, itd, itd->itd_dma); | |
1299 | if (itd == fotg210->last_itd_to_free) | |
1300 | break; | |
1301 | } | |
1302 | ||
1303 | if (!list_empty(&fotg210->cached_itd_list)) | |
1304 | start_free_itds(fotg210); | |
1305 | } | |
1306 | ||
1307 | ||
1308 | /* Handle lost (or very late) IAA interrupts */ | |
1309 | static void fotg210_iaa_watchdog(struct fotg210_hcd *fotg210) | |
1310 | { | |
1311 | if (fotg210->rh_state != FOTG210_RH_RUNNING) | |
1312 | return; | |
1313 | ||
1314 | /* | |
1315 | * Lost IAA irqs wedge things badly; seen first with a vt8235. | |
1316 | * So we need this watchdog, but must protect it against both | |
1317 | * (a) SMP races against real IAA firing and retriggering, and | |
1318 | * (b) clean HC shutdown, when IAA watchdog was pending. | |
1319 | */ | |
1320 | if (fotg210->async_iaa) { | |
1321 | u32 cmd, status; | |
1322 | ||
1323 | /* If we get here, IAA is *REALLY* late. It's barely | |
1324 | * conceivable that the system is so busy that CMD_IAAD | |
1325 | * is still legitimately set, so let's be sure it's | |
1326 | * clear before we read STS_IAA. (The HC should clear | |
1327 | * CMD_IAAD when it sets STS_IAA.) | |
1328 | */ | |
1329 | cmd = fotg210_readl(fotg210, &fotg210->regs->command); | |
1330 | ||
1331 | /* | |
1332 | * If IAA is set here it either legitimately triggered | |
1333 | * after the watchdog timer expired (_way_ late, so we'll | |
1334 | * still count it as lost) ... or a silicon erratum: | |
1335 | * - VIA seems to set IAA without triggering the IRQ; | |
1336 | * - IAAD potentially cleared without setting IAA. | |
1337 | */ | |
1338 | status = fotg210_readl(fotg210, &fotg210->regs->status); | |
1339 | if ((status & STS_IAA) || !(cmd & CMD_IAAD)) { | |
1340 | COUNT(fotg210->stats.lost_iaa); | |
1341 | fotg210_writel(fotg210, STS_IAA, | |
1342 | &fotg210->regs->status); | |
1343 | } | |
1344 | ||
be5ac4c4 | 1345 | fotg210_dbg(fotg210, "IAA watchdog: status %x cmd %x\n", |
7d50195f FHC |
1346 | status, cmd); |
1347 | end_unlink_async(fotg210); | |
1348 | } | |
1349 | } | |
1350 | ||
1351 | ||
1352 | /* Enable the I/O watchdog, if appropriate */ | |
1353 | static void turn_on_io_watchdog(struct fotg210_hcd *fotg210) | |
1354 | { | |
1355 | /* Not needed if the controller isn't running or it's already enabled */ | |
1356 | if (fotg210->rh_state != FOTG210_RH_RUNNING || | |
1357 | (fotg210->enabled_hrtimer_events & | |
1358 | BIT(FOTG210_HRTIMER_IO_WATCHDOG))) | |
1359 | return; | |
1360 | ||
1361 | /* | |
1362 | * Isochronous transfers always need the watchdog. | |
1363 | * For other sorts we use it only if the flag is set. | |
1364 | */ | |
1365 | if (fotg210->isoc_count > 0 || (fotg210->need_io_watchdog && | |
1366 | fotg210->async_count + fotg210->intr_count > 0)) | |
1367 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_IO_WATCHDOG, | |
1368 | true); | |
1369 | } | |
1370 | ||
1371 | ||
1372 | /* | |
1373 | * Handler functions for the hrtimer event types. | |
1374 | * Keep this array in the same order as the event types indexed by | |
1375 | * enum fotg210_hrtimer_event in fotg210.h. | |
1376 | */ | |
1377 | static void (*event_handlers[])(struct fotg210_hcd *) = { | |
1378 | fotg210_poll_ASS, /* FOTG210_HRTIMER_POLL_ASS */ | |
1379 | fotg210_poll_PSS, /* FOTG210_HRTIMER_POLL_PSS */ | |
1380 | fotg210_handle_controller_death, /* FOTG210_HRTIMER_POLL_DEAD */ | |
1381 | fotg210_handle_intr_unlinks, /* FOTG210_HRTIMER_UNLINK_INTR */ | |
1382 | end_free_itds, /* FOTG210_HRTIMER_FREE_ITDS */ | |
1383 | unlink_empty_async, /* FOTG210_HRTIMER_ASYNC_UNLINKS */ | |
1384 | fotg210_iaa_watchdog, /* FOTG210_HRTIMER_IAA_WATCHDOG */ | |
1385 | fotg210_disable_PSE, /* FOTG210_HRTIMER_DISABLE_PERIODIC */ | |
1386 | fotg210_disable_ASE, /* FOTG210_HRTIMER_DISABLE_ASYNC */ | |
1387 | fotg210_work, /* FOTG210_HRTIMER_IO_WATCHDOG */ | |
1388 | }; | |
1389 | ||
1390 | static enum hrtimer_restart fotg210_hrtimer_func(struct hrtimer *t) | |
1391 | { | |
1392 | struct fotg210_hcd *fotg210 = | |
1393 | container_of(t, struct fotg210_hcd, hrtimer); | |
1394 | ktime_t now; | |
1395 | unsigned long events; | |
1396 | unsigned long flags; | |
1397 | unsigned e; | |
1398 | ||
1399 | spin_lock_irqsave(&fotg210->lock, flags); | |
1400 | ||
1401 | events = fotg210->enabled_hrtimer_events; | |
1402 | fotg210->enabled_hrtimer_events = 0; | |
1403 | fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT; | |
1404 | ||
1405 | /* | |
1406 | * Check each pending event. If its time has expired, handle | |
1407 | * the event; otherwise re-enable it. | |
1408 | */ | |
1409 | now = ktime_get(); | |
1410 | for_each_set_bit(e, &events, FOTG210_HRTIMER_NUM_EVENTS) { | |
1411 | if (now.tv64 >= fotg210->hr_timeouts[e].tv64) | |
1412 | event_handlers[e](fotg210); | |
1413 | else | |
1414 | fotg210_enable_event(fotg210, e, false); | |
1415 | } | |
1416 | ||
1417 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1418 | return HRTIMER_NORESTART; | |
1419 | } | |
1420 | ||
1421 | /*-------------------------------------------------------------------------*/ | |
1422 | ||
1423 | #define fotg210_bus_suspend NULL | |
1424 | #define fotg210_bus_resume NULL | |
1425 | ||
1426 | /*-------------------------------------------------------------------------*/ | |
1427 | ||
1428 | static int check_reset_complete( | |
1429 | struct fotg210_hcd *fotg210, | |
1430 | int index, | |
1431 | u32 __iomem *status_reg, | |
1432 | int port_status | |
1433 | ) { | |
1434 | if (!(port_status & PORT_CONNECT)) | |
1435 | return port_status; | |
1436 | ||
1437 | /* if reset finished and it's still not enabled -- handoff */ | |
1438 | if (!(port_status & PORT_PE)) { | |
1439 | /* with integrated TT, there's nobody to hand it to! */ | |
1440 | fotg210_dbg(fotg210, | |
1441 | "Failed to enable port %d on root hub TT\n", | |
1442 | index+1); | |
1443 | return port_status; | |
1444 | } else { | |
1445 | fotg210_dbg(fotg210, "port %d reset complete, port enabled\n", | |
1446 | index + 1); | |
1447 | } | |
1448 | ||
1449 | return port_status; | |
1450 | } | |
1451 | ||
1452 | /*-------------------------------------------------------------------------*/ | |
1453 | ||
1454 | ||
1455 | /* build "status change" packet (one or two bytes) from HC registers */ | |
1456 | ||
1457 | static int | |
1458 | fotg210_hub_status_data(struct usb_hcd *hcd, char *buf) | |
1459 | { | |
1460 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
1461 | u32 temp, status; | |
1462 | u32 mask; | |
1463 | int retval = 1; | |
1464 | unsigned long flags; | |
1465 | ||
1466 | /* init status to no-changes */ | |
1467 | buf[0] = 0; | |
1468 | ||
1469 | /* Inform the core about resumes-in-progress by returning | |
1470 | * a non-zero value even if there are no status changes. | |
1471 | */ | |
1472 | status = fotg210->resuming_ports; | |
1473 | ||
1474 | mask = PORT_CSC | PORT_PEC; | |
1475 | /* PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND */ | |
1476 | ||
1477 | /* no hub change reports (bit 0) for now (power, ...) */ | |
1478 | ||
1479 | /* port N changes (bit N)? */ | |
1480 | spin_lock_irqsave(&fotg210->lock, flags); | |
1481 | ||
1482 | temp = fotg210_readl(fotg210, &fotg210->regs->port_status); | |
1483 | ||
1484 | /* | |
1485 | * Return status information even for ports with OWNER set. | |
1486 | * Otherwise khubd wouldn't see the disconnect event when a | |
1487 | * high-speed device is switched over to the companion | |
1488 | * controller by the user. | |
1489 | */ | |
1490 | ||
1491 | if ((temp & mask) != 0 || test_bit(0, &fotg210->port_c_suspend) | |
1492 | || (fotg210->reset_done[0] && time_after_eq( | |
1493 | jiffies, fotg210->reset_done[0]))) { | |
1494 | buf[0] |= 1 << 1; | |
1495 | status = STS_PCD; | |
1496 | } | |
1497 | /* FIXME autosuspend idle root hubs */ | |
1498 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1499 | return status ? retval : 0; | |
1500 | } | |
1501 | ||
1502 | /*-------------------------------------------------------------------------*/ | |
1503 | ||
1504 | static void | |
1505 | fotg210_hub_descriptor( | |
1506 | struct fotg210_hcd *fotg210, | |
1507 | struct usb_hub_descriptor *desc | |
1508 | ) { | |
1509 | int ports = HCS_N_PORTS(fotg210->hcs_params); | |
1510 | u16 temp; | |
1511 | ||
1512 | desc->bDescriptorType = 0x29; | |
1513 | desc->bPwrOn2PwrGood = 10; /* fotg210 1.0, 2.3.9 says 20ms max */ | |
1514 | desc->bHubContrCurrent = 0; | |
1515 | ||
1516 | desc->bNbrPorts = ports; | |
1517 | temp = 1 + (ports / 8); | |
1518 | desc->bDescLength = 7 + 2 * temp; | |
1519 | ||
1520 | /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ | |
1521 | memset(&desc->u.hs.DeviceRemovable[0], 0, temp); | |
1522 | memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp); | |
1523 | ||
1524 | temp = 0x0008; /* per-port overcurrent reporting */ | |
1525 | temp |= 0x0002; /* no power switching */ | |
1526 | desc->wHubCharacteristics = cpu_to_le16(temp); | |
1527 | } | |
1528 | ||
1529 | /*-------------------------------------------------------------------------*/ | |
1530 | ||
1531 | static int fotg210_hub_control( | |
1532 | struct usb_hcd *hcd, | |
1533 | u16 typeReq, | |
1534 | u16 wValue, | |
1535 | u16 wIndex, | |
1536 | char *buf, | |
1537 | u16 wLength | |
1538 | ) { | |
1539 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
1540 | int ports = HCS_N_PORTS(fotg210->hcs_params); | |
1541 | u32 __iomem *status_reg = &fotg210->regs->port_status; | |
1542 | u32 temp, temp1, status; | |
1543 | unsigned long flags; | |
1544 | int retval = 0; | |
1545 | unsigned selector; | |
1546 | ||
1547 | /* | |
1548 | * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR. | |
1549 | * HCS_INDICATOR may say we can change LEDs to off/amber/green. | |
1550 | * (track current state ourselves) ... blink for diagnostics, | |
1551 | * power, "this is the one", etc. EHCI spec supports this. | |
1552 | */ | |
1553 | ||
1554 | spin_lock_irqsave(&fotg210->lock, flags); | |
1555 | switch (typeReq) { | |
1556 | case ClearHubFeature: | |
1557 | switch (wValue) { | |
1558 | case C_HUB_LOCAL_POWER: | |
1559 | case C_HUB_OVER_CURRENT: | |
1560 | /* no hub-wide feature/status flags */ | |
1561 | break; | |
1562 | default: | |
1563 | goto error; | |
1564 | } | |
1565 | break; | |
1566 | case ClearPortFeature: | |
1567 | if (!wIndex || wIndex > ports) | |
1568 | goto error; | |
1569 | wIndex--; | |
1570 | temp = fotg210_readl(fotg210, status_reg); | |
1571 | temp &= ~PORT_RWC_BITS; | |
1572 | ||
1573 | /* | |
1574 | * Even if OWNER is set, so the port is owned by the | |
1575 | * companion controller, khubd needs to be able to clear | |
1576 | * the port-change status bits (especially | |
1577 | * USB_PORT_STAT_C_CONNECTION). | |
1578 | */ | |
1579 | ||
1580 | switch (wValue) { | |
1581 | case USB_PORT_FEAT_ENABLE: | |
1582 | fotg210_writel(fotg210, temp & ~PORT_PE, status_reg); | |
1583 | break; | |
1584 | case USB_PORT_FEAT_C_ENABLE: | |
1585 | fotg210_writel(fotg210, temp | PORT_PEC, status_reg); | |
1586 | break; | |
1587 | case USB_PORT_FEAT_SUSPEND: | |
1588 | if (temp & PORT_RESET) | |
1589 | goto error; | |
1590 | if (!(temp & PORT_SUSPEND)) | |
1591 | break; | |
1592 | if ((temp & PORT_PE) == 0) | |
1593 | goto error; | |
1594 | ||
1595 | /* resume signaling for 20 msec */ | |
1596 | fotg210_writel(fotg210, temp | PORT_RESUME, status_reg); | |
1597 | fotg210->reset_done[wIndex] = jiffies | |
1598 | + msecs_to_jiffies(20); | |
1599 | break; | |
1600 | case USB_PORT_FEAT_C_SUSPEND: | |
1601 | clear_bit(wIndex, &fotg210->port_c_suspend); | |
1602 | break; | |
1603 | case USB_PORT_FEAT_C_CONNECTION: | |
1604 | fotg210_writel(fotg210, temp | PORT_CSC, status_reg); | |
1605 | break; | |
1606 | case USB_PORT_FEAT_C_OVER_CURRENT: | |
1607 | fotg210_writel(fotg210, temp | OTGISR_OVC, | |
1608 | &fotg210->regs->otgisr); | |
1609 | break; | |
1610 | case USB_PORT_FEAT_C_RESET: | |
1611 | /* GetPortStatus clears reset */ | |
1612 | break; | |
1613 | default: | |
1614 | goto error; | |
1615 | } | |
1616 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1617 | break; | |
1618 | case GetHubDescriptor: | |
1619 | fotg210_hub_descriptor(fotg210, (struct usb_hub_descriptor *) | |
1620 | buf); | |
1621 | break; | |
1622 | case GetHubStatus: | |
1623 | /* no hub-wide feature/status flags */ | |
1624 | memset(buf, 0, 4); | |
1625 | /*cpu_to_le32s ((u32 *) buf); */ | |
1626 | break; | |
1627 | case GetPortStatus: | |
1628 | if (!wIndex || wIndex > ports) | |
1629 | goto error; | |
1630 | wIndex--; | |
1631 | status = 0; | |
1632 | temp = fotg210_readl(fotg210, status_reg); | |
1633 | ||
1634 | /* wPortChange bits */ | |
1635 | if (temp & PORT_CSC) | |
1636 | status |= USB_PORT_STAT_C_CONNECTION << 16; | |
1637 | if (temp & PORT_PEC) | |
1638 | status |= USB_PORT_STAT_C_ENABLE << 16; | |
1639 | ||
1640 | temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr); | |
1641 | if (temp1 & OTGISR_OVC) | |
1642 | status |= USB_PORT_STAT_C_OVERCURRENT << 16; | |
1643 | ||
1644 | /* whoever resumes must GetPortStatus to complete it!! */ | |
1645 | if (temp & PORT_RESUME) { | |
1646 | ||
1647 | /* Remote Wakeup received? */ | |
1648 | if (!fotg210->reset_done[wIndex]) { | |
1649 | /* resume signaling for 20 msec */ | |
1650 | fotg210->reset_done[wIndex] = jiffies | |
1651 | + msecs_to_jiffies(20); | |
1652 | /* check the port again */ | |
1653 | mod_timer(&fotg210_to_hcd(fotg210)->rh_timer, | |
1654 | fotg210->reset_done[wIndex]); | |
1655 | } | |
1656 | ||
1657 | /* resume completed? */ | |
1658 | else if (time_after_eq(jiffies, | |
1659 | fotg210->reset_done[wIndex])) { | |
1660 | clear_bit(wIndex, &fotg210->suspended_ports); | |
1661 | set_bit(wIndex, &fotg210->port_c_suspend); | |
1662 | fotg210->reset_done[wIndex] = 0; | |
1663 | ||
1664 | /* stop resume signaling */ | |
1665 | temp = fotg210_readl(fotg210, status_reg); | |
1666 | fotg210_writel(fotg210, | |
1667 | temp & ~(PORT_RWC_BITS | PORT_RESUME), | |
1668 | status_reg); | |
1669 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1670 | retval = handshake(fotg210, status_reg, | |
1671 | PORT_RESUME, 0, 2000 /* 2msec */); | |
1672 | if (retval != 0) { | |
1673 | fotg210_err(fotg210, | |
1674 | "port %d resume error %d\n", | |
1675 | wIndex + 1, retval); | |
1676 | goto error; | |
1677 | } | |
1678 | temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10)); | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | /* whoever resets must GetPortStatus to complete it!! */ | |
1683 | if ((temp & PORT_RESET) | |
1684 | && time_after_eq(jiffies, | |
1685 | fotg210->reset_done[wIndex])) { | |
1686 | status |= USB_PORT_STAT_C_RESET << 16; | |
1687 | fotg210->reset_done[wIndex] = 0; | |
1688 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1689 | ||
1690 | /* force reset to complete */ | |
1691 | fotg210_writel(fotg210, | |
1692 | temp & ~(PORT_RWC_BITS | PORT_RESET), | |
1693 | status_reg); | |
1694 | /* REVISIT: some hardware needs 550+ usec to clear | |
1695 | * this bit; seems too long to spin routinely... | |
1696 | */ | |
1697 | retval = handshake(fotg210, status_reg, | |
1698 | PORT_RESET, 0, 1000); | |
1699 | if (retval != 0) { | |
1700 | fotg210_err(fotg210, "port %d reset error %d\n", | |
1701 | wIndex + 1, retval); | |
1702 | goto error; | |
1703 | } | |
1704 | ||
1705 | /* see what we found out */ | |
1706 | temp = check_reset_complete(fotg210, wIndex, status_reg, | |
1707 | fotg210_readl(fotg210, status_reg)); | |
1708 | } | |
1709 | ||
1710 | if (!(temp & (PORT_RESUME|PORT_RESET))) { | |
1711 | fotg210->reset_done[wIndex] = 0; | |
1712 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1713 | } | |
1714 | ||
1715 | /* transfer dedicated ports to the companion hc */ | |
1716 | if ((temp & PORT_CONNECT) && | |
1717 | test_bit(wIndex, &fotg210->companion_ports)) { | |
1718 | temp &= ~PORT_RWC_BITS; | |
1719 | fotg210_writel(fotg210, temp, status_reg); | |
1720 | fotg210_dbg(fotg210, "port %d --> companion\n", | |
1721 | wIndex + 1); | |
1722 | temp = fotg210_readl(fotg210, status_reg); | |
1723 | } | |
1724 | ||
1725 | /* | |
1726 | * Even if OWNER is set, there's no harm letting khubd | |
1727 | * see the wPortStatus values (they should all be 0 except | |
1728 | * for PORT_POWER anyway). | |
1729 | */ | |
1730 | ||
1731 | if (temp & PORT_CONNECT) { | |
1732 | status |= USB_PORT_STAT_CONNECTION; | |
1733 | status |= fotg210_port_speed(fotg210, temp); | |
1734 | } | |
1735 | if (temp & PORT_PE) | |
1736 | status |= USB_PORT_STAT_ENABLE; | |
1737 | ||
1738 | /* maybe the port was unsuspended without our knowledge */ | |
1739 | if (temp & (PORT_SUSPEND|PORT_RESUME)) { | |
1740 | status |= USB_PORT_STAT_SUSPEND; | |
1741 | } else if (test_bit(wIndex, &fotg210->suspended_ports)) { | |
1742 | clear_bit(wIndex, &fotg210->suspended_ports); | |
1743 | clear_bit(wIndex, &fotg210->resuming_ports); | |
1744 | fotg210->reset_done[wIndex] = 0; | |
1745 | if (temp & PORT_PE) | |
1746 | set_bit(wIndex, &fotg210->port_c_suspend); | |
1747 | } | |
1748 | ||
1749 | temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr); | |
1750 | if (temp1 & OTGISR_OVC) | |
1751 | status |= USB_PORT_STAT_OVERCURRENT; | |
1752 | if (temp & PORT_RESET) | |
1753 | status |= USB_PORT_STAT_RESET; | |
1754 | if (test_bit(wIndex, &fotg210->port_c_suspend)) | |
1755 | status |= USB_PORT_STAT_C_SUSPEND << 16; | |
1756 | ||
3b707ece ON |
1757 | if (status & ~0xffff) /* only if wPortChange is interesting */ |
1758 | dbg_port(fotg210, "GetStatus", wIndex + 1, temp); | |
7d50195f FHC |
1759 | put_unaligned_le32(status, buf); |
1760 | break; | |
1761 | case SetHubFeature: | |
1762 | switch (wValue) { | |
1763 | case C_HUB_LOCAL_POWER: | |
1764 | case C_HUB_OVER_CURRENT: | |
1765 | /* no hub-wide feature/status flags */ | |
1766 | break; | |
1767 | default: | |
1768 | goto error; | |
1769 | } | |
1770 | break; | |
1771 | case SetPortFeature: | |
1772 | selector = wIndex >> 8; | |
1773 | wIndex &= 0xff; | |
1774 | ||
1775 | if (!wIndex || wIndex > ports) | |
1776 | goto error; | |
1777 | wIndex--; | |
1778 | temp = fotg210_readl(fotg210, status_reg); | |
1779 | temp &= ~PORT_RWC_BITS; | |
1780 | switch (wValue) { | |
1781 | case USB_PORT_FEAT_SUSPEND: | |
1782 | if ((temp & PORT_PE) == 0 | |
1783 | || (temp & PORT_RESET) != 0) | |
1784 | goto error; | |
1785 | ||
1786 | /* After above check the port must be connected. | |
1787 | * Set appropriate bit thus could put phy into low power | |
1788 | * mode if we have hostpc feature | |
1789 | */ | |
1790 | fotg210_writel(fotg210, temp | PORT_SUSPEND, | |
1791 | status_reg); | |
1792 | set_bit(wIndex, &fotg210->suspended_ports); | |
1793 | break; | |
1794 | case USB_PORT_FEAT_RESET: | |
1795 | if (temp & PORT_RESUME) | |
1796 | goto error; | |
1797 | /* line status bits may report this as low speed, | |
1798 | * which can be fine if this root hub has a | |
1799 | * transaction translator built in. | |
1800 | */ | |
be5ac4c4 | 1801 | fotg210_dbg(fotg210, "port %d reset\n", wIndex + 1); |
7d50195f FHC |
1802 | temp |= PORT_RESET; |
1803 | temp &= ~PORT_PE; | |
1804 | ||
1805 | /* | |
1806 | * caller must wait, then call GetPortStatus | |
1807 | * usb 2.0 spec says 50 ms resets on root | |
1808 | */ | |
1809 | fotg210->reset_done[wIndex] = jiffies | |
1810 | + msecs_to_jiffies(50); | |
1811 | fotg210_writel(fotg210, temp, status_reg); | |
1812 | break; | |
1813 | ||
1814 | /* For downstream facing ports (these): one hub port is put | |
1815 | * into test mode according to USB2 11.24.2.13, then the hub | |
1816 | * must be reset (which for root hub now means rmmod+modprobe, | |
1817 | * or else system reboot). See EHCI 2.3.9 and 4.14 for info | |
1818 | * about the EHCI-specific stuff. | |
1819 | */ | |
1820 | case USB_PORT_FEAT_TEST: | |
1821 | if (!selector || selector > 5) | |
1822 | goto error; | |
1823 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1824 | fotg210_quiesce(fotg210); | |
1825 | spin_lock_irqsave(&fotg210->lock, flags); | |
1826 | ||
1827 | /* Put all enabled ports into suspend */ | |
1828 | temp = fotg210_readl(fotg210, status_reg) & | |
1829 | ~PORT_RWC_BITS; | |
1830 | if (temp & PORT_PE) | |
1831 | fotg210_writel(fotg210, temp | PORT_SUSPEND, | |
1832 | status_reg); | |
1833 | ||
1834 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1835 | fotg210_halt(fotg210); | |
1836 | spin_lock_irqsave(&fotg210->lock, flags); | |
1837 | ||
1838 | temp = fotg210_readl(fotg210, status_reg); | |
1839 | temp |= selector << 16; | |
1840 | fotg210_writel(fotg210, temp, status_reg); | |
1841 | break; | |
1842 | ||
1843 | default: | |
1844 | goto error; | |
1845 | } | |
1846 | fotg210_readl(fotg210, &fotg210->regs->command); | |
1847 | break; | |
1848 | ||
1849 | default: | |
1850 | error: | |
1851 | /* "stall" on error */ | |
1852 | retval = -EPIPE; | |
1853 | } | |
1854 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
1855 | return retval; | |
1856 | } | |
1857 | ||
1858 | static void __maybe_unused fotg210_relinquish_port(struct usb_hcd *hcd, | |
1859 | int portnum) | |
1860 | { | |
1861 | return; | |
1862 | } | |
1863 | ||
1864 | static int __maybe_unused fotg210_port_handed_over(struct usb_hcd *hcd, | |
1865 | int portnum) | |
1866 | { | |
1867 | return 0; | |
1868 | } | |
1869 | /*-------------------------------------------------------------------------*/ | |
1870 | /* | |
1871 | * There's basically three types of memory: | |
1872 | * - data used only by the HCD ... kmalloc is fine | |
1873 | * - async and periodic schedules, shared by HC and HCD ... these | |
1874 | * need to use dma_pool or dma_alloc_coherent | |
1875 | * - driver buffers, read/written by HC ... single shot DMA mapped | |
1876 | * | |
1877 | * There's also "register" data (e.g. PCI or SOC), which is memory mapped. | |
1878 | * No memory seen by this driver is pageable. | |
1879 | */ | |
1880 | ||
1881 | /*-------------------------------------------------------------------------*/ | |
1882 | ||
1883 | /* Allocate the key transfer structures from the previously allocated pool */ | |
1884 | ||
1885 | static inline void fotg210_qtd_init(struct fotg210_hcd *fotg210, | |
1886 | struct fotg210_qtd *qtd, dma_addr_t dma) | |
1887 | { | |
1888 | memset(qtd, 0, sizeof(*qtd)); | |
1889 | qtd->qtd_dma = dma; | |
1890 | qtd->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT); | |
1891 | qtd->hw_next = FOTG210_LIST_END(fotg210); | |
1892 | qtd->hw_alt_next = FOTG210_LIST_END(fotg210); | |
1893 | INIT_LIST_HEAD(&qtd->qtd_list); | |
1894 | } | |
1895 | ||
1896 | static struct fotg210_qtd *fotg210_qtd_alloc(struct fotg210_hcd *fotg210, | |
1897 | gfp_t flags) | |
1898 | { | |
1899 | struct fotg210_qtd *qtd; | |
1900 | dma_addr_t dma; | |
1901 | ||
1902 | qtd = dma_pool_alloc(fotg210->qtd_pool, flags, &dma); | |
1903 | if (qtd != NULL) | |
1904 | fotg210_qtd_init(fotg210, qtd, dma); | |
1905 | ||
1906 | return qtd; | |
1907 | } | |
1908 | ||
1909 | static inline void fotg210_qtd_free(struct fotg210_hcd *fotg210, | |
1910 | struct fotg210_qtd *qtd) | |
1911 | { | |
1912 | dma_pool_free(fotg210->qtd_pool, qtd, qtd->qtd_dma); | |
1913 | } | |
1914 | ||
1915 | ||
1916 | static void qh_destroy(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
1917 | { | |
1918 | /* clean qtds first, and know this is not linked */ | |
1919 | if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) { | |
1920 | fotg210_dbg(fotg210, "unused qh not empty!\n"); | |
1921 | BUG(); | |
1922 | } | |
1923 | if (qh->dummy) | |
1924 | fotg210_qtd_free(fotg210, qh->dummy); | |
1925 | dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma); | |
1926 | kfree(qh); | |
1927 | } | |
1928 | ||
1929 | static struct fotg210_qh *fotg210_qh_alloc(struct fotg210_hcd *fotg210, | |
1930 | gfp_t flags) | |
1931 | { | |
1932 | struct fotg210_qh *qh; | |
1933 | dma_addr_t dma; | |
1934 | ||
1935 | qh = kzalloc(sizeof(*qh), GFP_ATOMIC); | |
1936 | if (!qh) | |
1937 | goto done; | |
1938 | qh->hw = (struct fotg210_qh_hw *) | |
1939 | dma_pool_alloc(fotg210->qh_pool, flags, &dma); | |
1940 | if (!qh->hw) | |
1941 | goto fail; | |
1942 | memset(qh->hw, 0, sizeof(*qh->hw)); | |
1943 | qh->qh_dma = dma; | |
1944 | INIT_LIST_HEAD(&qh->qtd_list); | |
1945 | ||
1946 | /* dummy td enables safe urb queuing */ | |
1947 | qh->dummy = fotg210_qtd_alloc(fotg210, flags); | |
1948 | if (qh->dummy == NULL) { | |
1949 | fotg210_dbg(fotg210, "no dummy td\n"); | |
1950 | goto fail1; | |
1951 | } | |
1952 | done: | |
1953 | return qh; | |
1954 | fail1: | |
1955 | dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma); | |
1956 | fail: | |
1957 | kfree(qh); | |
1958 | return NULL; | |
1959 | } | |
1960 | ||
1961 | /*-------------------------------------------------------------------------*/ | |
1962 | ||
1963 | /* The queue heads and transfer descriptors are managed from pools tied | |
1964 | * to each of the "per device" structures. | |
1965 | * This is the initialisation and cleanup code. | |
1966 | */ | |
1967 | ||
1968 | static void fotg210_mem_cleanup(struct fotg210_hcd *fotg210) | |
1969 | { | |
1970 | if (fotg210->async) | |
1971 | qh_destroy(fotg210, fotg210->async); | |
1972 | fotg210->async = NULL; | |
1973 | ||
1974 | if (fotg210->dummy) | |
1975 | qh_destroy(fotg210, fotg210->dummy); | |
1976 | fotg210->dummy = NULL; | |
1977 | ||
1978 | /* DMA consistent memory and pools */ | |
1979 | if (fotg210->qtd_pool) | |
1980 | dma_pool_destroy(fotg210->qtd_pool); | |
1981 | fotg210->qtd_pool = NULL; | |
1982 | ||
1983 | if (fotg210->qh_pool) { | |
1984 | dma_pool_destroy(fotg210->qh_pool); | |
1985 | fotg210->qh_pool = NULL; | |
1986 | } | |
1987 | ||
1988 | if (fotg210->itd_pool) | |
1989 | dma_pool_destroy(fotg210->itd_pool); | |
1990 | fotg210->itd_pool = NULL; | |
1991 | ||
1992 | if (fotg210->periodic) | |
1993 | dma_free_coherent(fotg210_to_hcd(fotg210)->self.controller, | |
1994 | fotg210->periodic_size * sizeof(u32), | |
1995 | fotg210->periodic, fotg210->periodic_dma); | |
1996 | fotg210->periodic = NULL; | |
1997 | ||
1998 | /* shadow periodic table */ | |
1999 | kfree(fotg210->pshadow); | |
2000 | fotg210->pshadow = NULL; | |
2001 | } | |
2002 | ||
2003 | /* remember to add cleanup code (above) if you add anything here */ | |
2004 | static int fotg210_mem_init(struct fotg210_hcd *fotg210, gfp_t flags) | |
2005 | { | |
2006 | int i; | |
2007 | ||
2008 | /* QTDs for control/bulk/intr transfers */ | |
2009 | fotg210->qtd_pool = dma_pool_create("fotg210_qtd", | |
2010 | fotg210_to_hcd(fotg210)->self.controller, | |
2011 | sizeof(struct fotg210_qtd), | |
2012 | 32 /* byte alignment (for hw parts) */, | |
2013 | 4096 /* can't cross 4K */); | |
2014 | if (!fotg210->qtd_pool) | |
2015 | goto fail; | |
2016 | ||
2017 | /* QHs for control/bulk/intr transfers */ | |
2018 | fotg210->qh_pool = dma_pool_create("fotg210_qh", | |
2019 | fotg210_to_hcd(fotg210)->self.controller, | |
2020 | sizeof(struct fotg210_qh_hw), | |
2021 | 32 /* byte alignment (for hw parts) */, | |
2022 | 4096 /* can't cross 4K */); | |
2023 | if (!fotg210->qh_pool) | |
2024 | goto fail; | |
2025 | ||
2026 | fotg210->async = fotg210_qh_alloc(fotg210, flags); | |
2027 | if (!fotg210->async) | |
2028 | goto fail; | |
2029 | ||
2030 | /* ITD for high speed ISO transfers */ | |
2031 | fotg210->itd_pool = dma_pool_create("fotg210_itd", | |
2032 | fotg210_to_hcd(fotg210)->self.controller, | |
2033 | sizeof(struct fotg210_itd), | |
2034 | 64 /* byte alignment (for hw parts) */, | |
2035 | 4096 /* can't cross 4K */); | |
2036 | if (!fotg210->itd_pool) | |
2037 | goto fail; | |
2038 | ||
2039 | /* Hardware periodic table */ | |
2040 | fotg210->periodic = (__le32 *) | |
2041 | dma_alloc_coherent(fotg210_to_hcd(fotg210)->self.controller, | |
2042 | fotg210->periodic_size * sizeof(__le32), | |
2043 | &fotg210->periodic_dma, 0); | |
2044 | if (fotg210->periodic == NULL) | |
2045 | goto fail; | |
2046 | ||
2047 | for (i = 0; i < fotg210->periodic_size; i++) | |
2048 | fotg210->periodic[i] = FOTG210_LIST_END(fotg210); | |
2049 | ||
2050 | /* software shadow of hardware table */ | |
2051 | fotg210->pshadow = kcalloc(fotg210->periodic_size, sizeof(void *), | |
2052 | flags); | |
2053 | if (fotg210->pshadow != NULL) | |
2054 | return 0; | |
2055 | ||
2056 | fail: | |
2057 | fotg210_dbg(fotg210, "couldn't init memory\n"); | |
2058 | fotg210_mem_cleanup(fotg210); | |
2059 | return -ENOMEM; | |
2060 | } | |
2061 | /*-------------------------------------------------------------------------*/ | |
2062 | /* | |
2063 | * EHCI hardware queue manipulation ... the core. QH/QTD manipulation. | |
2064 | * | |
2065 | * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd" | |
2066 | * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned | |
2067 | * buffers needed for the larger number). We use one QH per endpoint, queue | |
2068 | * multiple urbs (all three types) per endpoint. URBs may need several qtds. | |
2069 | * | |
2070 | * ISO traffic uses "ISO TD" (itd) records, and (along with | |
2071 | * interrupts) needs careful scheduling. Performance improvements can be | |
2072 | * an ongoing challenge. That's in "ehci-sched.c". | |
2073 | * | |
2074 | * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs, | |
2075 | * or otherwise through transaction translators (TTs) in USB 2.0 hubs using | |
2076 | * (b) special fields in qh entries or (c) split iso entries. TTs will | |
2077 | * buffer low/full speed data so the host collects it at high speed. | |
2078 | */ | |
2079 | ||
2080 | /*-------------------------------------------------------------------------*/ | |
2081 | ||
2082 | /* fill a qtd, returning how much of the buffer we were able to queue up */ | |
2083 | ||
2084 | static int | |
2085 | qtd_fill(struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd, dma_addr_t buf, | |
2086 | size_t len, int token, int maxpacket) | |
2087 | { | |
2088 | int i, count; | |
2089 | u64 addr = buf; | |
2090 | ||
2091 | /* one buffer entry per 4K ... first might be short or unaligned */ | |
2092 | qtd->hw_buf[0] = cpu_to_hc32(fotg210, (u32)addr); | |
2093 | qtd->hw_buf_hi[0] = cpu_to_hc32(fotg210, (u32)(addr >> 32)); | |
2094 | count = 0x1000 - (buf & 0x0fff); /* rest of that page */ | |
2095 | if (likely(len < count)) /* ... iff needed */ | |
2096 | count = len; | |
2097 | else { | |
2098 | buf += 0x1000; | |
2099 | buf &= ~0x0fff; | |
2100 | ||
2101 | /* per-qtd limit: from 16K to 20K (best alignment) */ | |
2102 | for (i = 1; count < len && i < 5; i++) { | |
2103 | addr = buf; | |
2104 | qtd->hw_buf[i] = cpu_to_hc32(fotg210, (u32)addr); | |
2105 | qtd->hw_buf_hi[i] = cpu_to_hc32(fotg210, | |
2106 | (u32)(addr >> 32)); | |
2107 | buf += 0x1000; | |
2108 | if ((count + 0x1000) < len) | |
2109 | count += 0x1000; | |
2110 | else | |
2111 | count = len; | |
2112 | } | |
2113 | ||
2114 | /* short packets may only terminate transfers */ | |
2115 | if (count != len) | |
2116 | count -= (count % maxpacket); | |
2117 | } | |
2118 | qtd->hw_token = cpu_to_hc32(fotg210, (count << 16) | token); | |
2119 | qtd->length = count; | |
2120 | ||
2121 | return count; | |
2122 | } | |
2123 | ||
2124 | /*-------------------------------------------------------------------------*/ | |
2125 | ||
2126 | static inline void | |
2127 | qh_update(struct fotg210_hcd *fotg210, struct fotg210_qh *qh, | |
2128 | struct fotg210_qtd *qtd) | |
2129 | { | |
2130 | struct fotg210_qh_hw *hw = qh->hw; | |
2131 | ||
2132 | /* writes to an active overlay are unsafe */ | |
2133 | BUG_ON(qh->qh_state != QH_STATE_IDLE); | |
2134 | ||
2135 | hw->hw_qtd_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2136 | hw->hw_alt_next = FOTG210_LIST_END(fotg210); | |
2137 | ||
2138 | /* Except for control endpoints, we make hardware maintain data | |
2139 | * toggle (like OHCI) ... here (re)initialize the toggle in the QH, | |
2140 | * and set the pseudo-toggle in udev. Only usb_clear_halt() will | |
2141 | * ever clear it. | |
2142 | */ | |
2143 | if (!(hw->hw_info1 & cpu_to_hc32(fotg210, QH_TOGGLE_CTL))) { | |
2144 | unsigned is_out, epnum; | |
2145 | ||
2146 | is_out = qh->is_out; | |
2147 | epnum = (hc32_to_cpup(fotg210, &hw->hw_info1) >> 8) & 0x0f; | |
2148 | if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) { | |
2149 | hw->hw_token &= ~cpu_to_hc32(fotg210, QTD_TOGGLE); | |
2150 | usb_settoggle(qh->dev, epnum, is_out, 1); | |
2151 | } | |
2152 | } | |
2153 | ||
2154 | hw->hw_token &= cpu_to_hc32(fotg210, QTD_TOGGLE | QTD_STS_PING); | |
2155 | } | |
2156 | ||
2157 | /* if it weren't for a common silicon quirk (writing the dummy into the qh | |
2158 | * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault | |
2159 | * recovery (including urb dequeue) would need software changes to a QH... | |
2160 | */ | |
2161 | static void | |
2162 | qh_refresh(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
2163 | { | |
2164 | struct fotg210_qtd *qtd; | |
2165 | ||
2166 | if (list_empty(&qh->qtd_list)) | |
2167 | qtd = qh->dummy; | |
2168 | else { | |
2169 | qtd = list_entry(qh->qtd_list.next, | |
2170 | struct fotg210_qtd, qtd_list); | |
2171 | /* | |
2172 | * first qtd may already be partially processed. | |
2173 | * If we come here during unlink, the QH overlay region | |
2174 | * might have reference to the just unlinked qtd. The | |
2175 | * qtd is updated in qh_completions(). Update the QH | |
2176 | * overlay here. | |
2177 | */ | |
2178 | if (cpu_to_hc32(fotg210, qtd->qtd_dma) == qh->hw->hw_current) { | |
2179 | qh->hw->hw_qtd_next = qtd->hw_next; | |
2180 | qtd = NULL; | |
2181 | } | |
2182 | } | |
2183 | ||
2184 | if (qtd) | |
2185 | qh_update(fotg210, qh, qtd); | |
2186 | } | |
2187 | ||
2188 | /*-------------------------------------------------------------------------*/ | |
2189 | ||
2190 | static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); | |
2191 | ||
2192 | static void fotg210_clear_tt_buffer_complete(struct usb_hcd *hcd, | |
2193 | struct usb_host_endpoint *ep) | |
2194 | { | |
2195 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
2196 | struct fotg210_qh *qh = ep->hcpriv; | |
2197 | unsigned long flags; | |
2198 | ||
2199 | spin_lock_irqsave(&fotg210->lock, flags); | |
2200 | qh->clearing_tt = 0; | |
2201 | if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list) | |
2202 | && fotg210->rh_state == FOTG210_RH_RUNNING) | |
2203 | qh_link_async(fotg210, qh); | |
2204 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
2205 | } | |
2206 | ||
2207 | static void fotg210_clear_tt_buffer(struct fotg210_hcd *fotg210, | |
2208 | struct fotg210_qh *qh, | |
2209 | struct urb *urb, u32 token) | |
2210 | { | |
2211 | ||
2212 | /* If an async split transaction gets an error or is unlinked, | |
2213 | * the TT buffer may be left in an indeterminate state. We | |
2214 | * have to clear the TT buffer. | |
2215 | * | |
2216 | * Note: this routine is never called for Isochronous transfers. | |
2217 | */ | |
2218 | if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) { | |
7d50195f FHC |
2219 | struct usb_device *tt = urb->dev->tt->hub; |
2220 | dev_dbg(&tt->dev, | |
2221 | "clear tt buffer port %d, a%d ep%d t%08x\n", | |
2222 | urb->dev->ttport, urb->dev->devnum, | |
2223 | usb_pipeendpoint(urb->pipe), token); | |
3b707ece | 2224 | |
7d50195f FHC |
2225 | if (urb->dev->tt->hub != |
2226 | fotg210_to_hcd(fotg210)->self.root_hub) { | |
2227 | if (usb_hub_clear_tt_buffer(urb) == 0) | |
2228 | qh->clearing_tt = 1; | |
2229 | } | |
2230 | } | |
2231 | } | |
2232 | ||
2233 | static int qtd_copy_status( | |
2234 | struct fotg210_hcd *fotg210, | |
2235 | struct urb *urb, | |
2236 | size_t length, | |
2237 | u32 token | |
2238 | ) | |
2239 | { | |
2240 | int status = -EINPROGRESS; | |
2241 | ||
2242 | /* count IN/OUT bytes, not SETUP (even short packets) */ | |
2243 | if (likely(QTD_PID(token) != 2)) | |
2244 | urb->actual_length += length - QTD_LENGTH(token); | |
2245 | ||
2246 | /* don't modify error codes */ | |
2247 | if (unlikely(urb->unlinked)) | |
2248 | return status; | |
2249 | ||
2250 | /* force cleanup after short read; not always an error */ | |
2251 | if (unlikely(IS_SHORT_READ(token))) | |
2252 | status = -EREMOTEIO; | |
2253 | ||
2254 | /* serious "can't proceed" faults reported by the hardware */ | |
2255 | if (token & QTD_STS_HALT) { | |
2256 | if (token & QTD_STS_BABBLE) { | |
2257 | /* FIXME "must" disable babbling device's port too */ | |
2258 | status = -EOVERFLOW; | |
2259 | /* CERR nonzero + halt --> stall */ | |
2260 | } else if (QTD_CERR(token)) { | |
2261 | status = -EPIPE; | |
2262 | ||
2263 | /* In theory, more than one of the following bits can be set | |
2264 | * since they are sticky and the transaction is retried. | |
2265 | * Which to test first is rather arbitrary. | |
2266 | */ | |
2267 | } else if (token & QTD_STS_MMF) { | |
2268 | /* fs/ls interrupt xfer missed the complete-split */ | |
2269 | status = -EPROTO; | |
2270 | } else if (token & QTD_STS_DBE) { | |
2271 | status = (QTD_PID(token) == 1) /* IN ? */ | |
2272 | ? -ENOSR /* hc couldn't read data */ | |
2273 | : -ECOMM; /* hc couldn't write data */ | |
2274 | } else if (token & QTD_STS_XACT) { | |
2275 | /* timeout, bad CRC, wrong PID, etc */ | |
2276 | fotg210_dbg(fotg210, "devpath %s ep%d%s 3strikes\n", | |
2277 | urb->dev->devpath, | |
2278 | usb_pipeendpoint(urb->pipe), | |
2279 | usb_pipein(urb->pipe) ? "in" : "out"); | |
2280 | status = -EPROTO; | |
2281 | } else { /* unknown */ | |
2282 | status = -EPROTO; | |
2283 | } | |
2284 | ||
be5ac4c4 | 2285 | fotg210_dbg(fotg210, |
7d50195f FHC |
2286 | "dev%d ep%d%s qtd token %08x --> status %d\n", |
2287 | usb_pipedevice(urb->pipe), | |
2288 | usb_pipeendpoint(urb->pipe), | |
2289 | usb_pipein(urb->pipe) ? "in" : "out", | |
2290 | token, status); | |
2291 | } | |
2292 | ||
2293 | return status; | |
2294 | } | |
2295 | ||
2296 | static void | |
2297 | fotg210_urb_done(struct fotg210_hcd *fotg210, struct urb *urb, int status) | |
2298 | __releases(fotg210->lock) | |
2299 | __acquires(fotg210->lock) | |
2300 | { | |
2301 | if (likely(urb->hcpriv != NULL)) { | |
2302 | struct fotg210_qh *qh = (struct fotg210_qh *) urb->hcpriv; | |
2303 | ||
2304 | /* S-mask in a QH means it's an interrupt urb */ | |
2305 | if ((qh->hw->hw_info2 & cpu_to_hc32(fotg210, QH_SMASK)) != 0) { | |
2306 | ||
2307 | /* ... update hc-wide periodic stats (for usbfs) */ | |
2308 | fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs--; | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | if (unlikely(urb->unlinked)) { | |
2313 | COUNT(fotg210->stats.unlink); | |
2314 | } else { | |
2315 | /* report non-error and short read status as zero */ | |
2316 | if (status == -EINPROGRESS || status == -EREMOTEIO) | |
2317 | status = 0; | |
2318 | COUNT(fotg210->stats.complete); | |
2319 | } | |
2320 | ||
2321 | #ifdef FOTG210_URB_TRACE | |
2322 | fotg210_dbg(fotg210, | |
2323 | "%s %s urb %p ep%d%s status %d len %d/%d\n", | |
2324 | __func__, urb->dev->devpath, urb, | |
2325 | usb_pipeendpoint(urb->pipe), | |
2326 | usb_pipein(urb->pipe) ? "in" : "out", | |
2327 | status, | |
2328 | urb->actual_length, urb->transfer_buffer_length); | |
2329 | #endif | |
2330 | ||
2331 | /* complete() can reenter this HCD */ | |
2332 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
2333 | spin_unlock(&fotg210->lock); | |
2334 | usb_hcd_giveback_urb(fotg210_to_hcd(fotg210), urb, status); | |
2335 | spin_lock(&fotg210->lock); | |
2336 | } | |
2337 | ||
2338 | static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); | |
2339 | ||
2340 | /* | |
2341 | * Process and free completed qtds for a qh, returning URBs to drivers. | |
2342 | * Chases up to qh->hw_current. Returns number of completions called, | |
2343 | * indicating how much "real" work we did. | |
2344 | */ | |
2345 | static unsigned | |
2346 | qh_completions(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
2347 | { | |
2348 | struct fotg210_qtd *last, *end = qh->dummy; | |
2349 | struct list_head *entry, *tmp; | |
2350 | int last_status; | |
2351 | int stopped; | |
2352 | unsigned count = 0; | |
2353 | u8 state; | |
2354 | struct fotg210_qh_hw *hw = qh->hw; | |
2355 | ||
2356 | if (unlikely(list_empty(&qh->qtd_list))) | |
2357 | return count; | |
2358 | ||
2359 | /* completions (or tasks on other cpus) must never clobber HALT | |
2360 | * till we've gone through and cleaned everything up, even when | |
2361 | * they add urbs to this qh's queue or mark them for unlinking. | |
2362 | * | |
2363 | * NOTE: unlinking expects to be done in queue order. | |
2364 | * | |
2365 | * It's a bug for qh->qh_state to be anything other than | |
2366 | * QH_STATE_IDLE, unless our caller is scan_async() or | |
2367 | * scan_intr(). | |
2368 | */ | |
2369 | state = qh->qh_state; | |
2370 | qh->qh_state = QH_STATE_COMPLETING; | |
2371 | stopped = (state == QH_STATE_IDLE); | |
2372 | ||
2373 | rescan: | |
2374 | last = NULL; | |
2375 | last_status = -EINPROGRESS; | |
2376 | qh->needs_rescan = 0; | |
2377 | ||
2378 | /* remove de-activated QTDs from front of queue. | |
2379 | * after faults (including short reads), cleanup this urb | |
2380 | * then let the queue advance. | |
2381 | * if queue is stopped, handles unlinks. | |
2382 | */ | |
2383 | list_for_each_safe(entry, tmp, &qh->qtd_list) { | |
2384 | struct fotg210_qtd *qtd; | |
2385 | struct urb *urb; | |
2386 | u32 token = 0; | |
2387 | ||
2388 | qtd = list_entry(entry, struct fotg210_qtd, qtd_list); | |
2389 | urb = qtd->urb; | |
2390 | ||
2391 | /* clean up any state from previous QTD ...*/ | |
2392 | if (last) { | |
2393 | if (likely(last->urb != urb)) { | |
2394 | fotg210_urb_done(fotg210, last->urb, | |
2395 | last_status); | |
2396 | count++; | |
2397 | last_status = -EINPROGRESS; | |
2398 | } | |
2399 | fotg210_qtd_free(fotg210, last); | |
2400 | last = NULL; | |
2401 | } | |
2402 | ||
2403 | /* ignore urbs submitted during completions we reported */ | |
2404 | if (qtd == end) | |
2405 | break; | |
2406 | ||
2407 | /* hardware copies qtd out of qh overlay */ | |
2408 | rmb(); | |
2409 | token = hc32_to_cpu(fotg210, qtd->hw_token); | |
2410 | ||
2411 | /* always clean up qtds the hc de-activated */ | |
2412 | retry_xacterr: | |
2413 | if ((token & QTD_STS_ACTIVE) == 0) { | |
2414 | ||
2415 | /* Report Data Buffer Error: non-fatal but useful */ | |
2416 | if (token & QTD_STS_DBE) | |
2417 | fotg210_dbg(fotg210, | |
2418 | "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n", | |
2419 | urb, | |
2420 | usb_endpoint_num(&urb->ep->desc), | |
2421 | usb_endpoint_dir_in(&urb->ep->desc) | |
2422 | ? "in" : "out", | |
2423 | urb->transfer_buffer_length, | |
2424 | qtd, | |
2425 | qh); | |
2426 | ||
2427 | /* on STALL, error, and short reads this urb must | |
2428 | * complete and all its qtds must be recycled. | |
2429 | */ | |
2430 | if ((token & QTD_STS_HALT) != 0) { | |
2431 | ||
2432 | /* retry transaction errors until we | |
2433 | * reach the software xacterr limit | |
2434 | */ | |
2435 | if ((token & QTD_STS_XACT) && | |
2436 | QTD_CERR(token) == 0 && | |
2437 | ++qh->xacterrs < QH_XACTERR_MAX && | |
2438 | !urb->unlinked) { | |
2439 | fotg210_dbg(fotg210, | |
2440 | "detected XactErr len %zu/%zu retry %d\n", | |
2441 | qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs); | |
2442 | ||
2443 | /* reset the token in the qtd and the | |
2444 | * qh overlay (which still contains | |
2445 | * the qtd) so that we pick up from | |
2446 | * where we left off | |
2447 | */ | |
2448 | token &= ~QTD_STS_HALT; | |
2449 | token |= QTD_STS_ACTIVE | | |
2450 | (FOTG210_TUNE_CERR << 10); | |
2451 | qtd->hw_token = cpu_to_hc32(fotg210, | |
2452 | token); | |
2453 | wmb(); | |
2454 | hw->hw_token = cpu_to_hc32(fotg210, | |
2455 | token); | |
2456 | goto retry_xacterr; | |
2457 | } | |
2458 | stopped = 1; | |
2459 | ||
2460 | /* magic dummy for some short reads; qh won't advance. | |
2461 | * that silicon quirk can kick in with this dummy too. | |
2462 | * | |
2463 | * other short reads won't stop the queue, including | |
2464 | * control transfers (status stage handles that) or | |
2465 | * most other single-qtd reads ... the queue stops if | |
2466 | * URB_SHORT_NOT_OK was set so the driver submitting | |
2467 | * the urbs could clean it up. | |
2468 | */ | |
2469 | } else if (IS_SHORT_READ(token) | |
2470 | && !(qtd->hw_alt_next | |
2471 | & FOTG210_LIST_END(fotg210))) { | |
2472 | stopped = 1; | |
2473 | } | |
2474 | ||
2475 | /* stop scanning when we reach qtds the hc is using */ | |
2476 | } else if (likely(!stopped | |
2477 | && fotg210->rh_state >= FOTG210_RH_RUNNING)) { | |
2478 | break; | |
2479 | ||
2480 | /* scan the whole queue for unlinks whenever it stops */ | |
2481 | } else { | |
2482 | stopped = 1; | |
2483 | ||
2484 | /* cancel everything if we halt, suspend, etc */ | |
2485 | if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
2486 | last_status = -ESHUTDOWN; | |
2487 | ||
2488 | /* this qtd is active; skip it unless a previous qtd | |
2489 | * for its urb faulted, or its urb was canceled. | |
2490 | */ | |
2491 | else if (last_status == -EINPROGRESS && !urb->unlinked) | |
2492 | continue; | |
2493 | ||
2494 | /* qh unlinked; token in overlay may be most current */ | |
2495 | if (state == QH_STATE_IDLE | |
2496 | && cpu_to_hc32(fotg210, qtd->qtd_dma) | |
2497 | == hw->hw_current) { | |
2498 | token = hc32_to_cpu(fotg210, hw->hw_token); | |
2499 | ||
2500 | /* An unlink may leave an incomplete | |
2501 | * async transaction in the TT buffer. | |
2502 | * We have to clear it. | |
2503 | */ | |
2504 | fotg210_clear_tt_buffer(fotg210, qh, urb, | |
2505 | token); | |
2506 | } | |
2507 | } | |
2508 | ||
2509 | /* unless we already know the urb's status, collect qtd status | |
2510 | * and update count of bytes transferred. in common short read | |
2511 | * cases with only one data qtd (including control transfers), | |
2512 | * queue processing won't halt. but with two or more qtds (for | |
2513 | * example, with a 32 KB transfer), when the first qtd gets a | |
2514 | * short read the second must be removed by hand. | |
2515 | */ | |
2516 | if (last_status == -EINPROGRESS) { | |
2517 | last_status = qtd_copy_status(fotg210, urb, | |
2518 | qtd->length, token); | |
2519 | if (last_status == -EREMOTEIO | |
2520 | && (qtd->hw_alt_next | |
2521 | & FOTG210_LIST_END(fotg210))) | |
2522 | last_status = -EINPROGRESS; | |
2523 | ||
2524 | /* As part of low/full-speed endpoint-halt processing | |
2525 | * we must clear the TT buffer (11.17.5). | |
2526 | */ | |
2527 | if (unlikely(last_status != -EINPROGRESS && | |
2528 | last_status != -EREMOTEIO)) { | |
2529 | /* The TT's in some hubs malfunction when they | |
2530 | * receive this request following a STALL (they | |
2531 | * stop sending isochronous packets). Since a | |
2532 | * STALL can't leave the TT buffer in a busy | |
2533 | * state (if you believe Figures 11-48 - 11-51 | |
2534 | * in the USB 2.0 spec), we won't clear the TT | |
2535 | * buffer in this case. Strictly speaking this | |
2536 | * is a violation of the spec. | |
2537 | */ | |
2538 | if (last_status != -EPIPE) | |
2539 | fotg210_clear_tt_buffer(fotg210, qh, | |
2540 | urb, token); | |
2541 | } | |
2542 | } | |
2543 | ||
2544 | /* if we're removing something not at the queue head, | |
2545 | * patch the hardware queue pointer. | |
2546 | */ | |
2547 | if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { | |
2548 | last = list_entry(qtd->qtd_list.prev, | |
2549 | struct fotg210_qtd, qtd_list); | |
2550 | last->hw_next = qtd->hw_next; | |
2551 | } | |
2552 | ||
2553 | /* remove qtd; it's recycled after possible urb completion */ | |
2554 | list_del(&qtd->qtd_list); | |
2555 | last = qtd; | |
2556 | ||
2557 | /* reinit the xacterr counter for the next qtd */ | |
2558 | qh->xacterrs = 0; | |
2559 | } | |
2560 | ||
2561 | /* last urb's completion might still need calling */ | |
2562 | if (likely(last != NULL)) { | |
2563 | fotg210_urb_done(fotg210, last->urb, last_status); | |
2564 | count++; | |
2565 | fotg210_qtd_free(fotg210, last); | |
2566 | } | |
2567 | ||
2568 | /* Do we need to rescan for URBs dequeued during a giveback? */ | |
2569 | if (unlikely(qh->needs_rescan)) { | |
2570 | /* If the QH is already unlinked, do the rescan now. */ | |
2571 | if (state == QH_STATE_IDLE) | |
2572 | goto rescan; | |
2573 | ||
2574 | /* Otherwise we have to wait until the QH is fully unlinked. | |
2575 | * Our caller will start an unlink if qh->needs_rescan is | |
2576 | * set. But if an unlink has already started, nothing needs | |
2577 | * to be done. | |
2578 | */ | |
2579 | if (state != QH_STATE_LINKED) | |
2580 | qh->needs_rescan = 0; | |
2581 | } | |
2582 | ||
2583 | /* restore original state; caller must unlink or relink */ | |
2584 | qh->qh_state = state; | |
2585 | ||
2586 | /* be sure the hardware's done with the qh before refreshing | |
2587 | * it after fault cleanup, or recovering from silicon wrongly | |
2588 | * overlaying the dummy qtd (which reduces DMA chatter). | |
2589 | */ | |
2590 | if (stopped != 0 || hw->hw_qtd_next == FOTG210_LIST_END(fotg210)) { | |
2591 | switch (state) { | |
2592 | case QH_STATE_IDLE: | |
2593 | qh_refresh(fotg210, qh); | |
2594 | break; | |
2595 | case QH_STATE_LINKED: | |
2596 | /* We won't refresh a QH that's linked (after the HC | |
2597 | * stopped the queue). That avoids a race: | |
2598 | * - HC reads first part of QH; | |
2599 | * - CPU updates that first part and the token; | |
2600 | * - HC reads rest of that QH, including token | |
2601 | * Result: HC gets an inconsistent image, and then | |
2602 | * DMAs to/from the wrong memory (corrupting it). | |
2603 | * | |
2604 | * That should be rare for interrupt transfers, | |
2605 | * except maybe high bandwidth ... | |
2606 | */ | |
2607 | ||
2608 | /* Tell the caller to start an unlink */ | |
2609 | qh->needs_rescan = 1; | |
2610 | break; | |
2611 | /* otherwise, unlink already started */ | |
2612 | } | |
2613 | } | |
2614 | ||
2615 | return count; | |
2616 | } | |
2617 | ||
2618 | /*-------------------------------------------------------------------------*/ | |
2619 | ||
2620 | /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ | |
2621 | #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) | |
2622 | /* ... and packet size, for any kind of endpoint descriptor */ | |
2623 | #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) | |
2624 | ||
2625 | /* | |
2626 | * reverse of qh_urb_transaction: free a list of TDs. | |
2627 | * used for cleanup after errors, before HC sees an URB's TDs. | |
2628 | */ | |
2629 | static void qtd_list_free( | |
2630 | struct fotg210_hcd *fotg210, | |
2631 | struct urb *urb, | |
2632 | struct list_head *qtd_list | |
2633 | ) { | |
2634 | struct list_head *entry, *temp; | |
2635 | ||
2636 | list_for_each_safe(entry, temp, qtd_list) { | |
2637 | struct fotg210_qtd *qtd; | |
2638 | ||
2639 | qtd = list_entry(entry, struct fotg210_qtd, qtd_list); | |
2640 | list_del(&qtd->qtd_list); | |
2641 | fotg210_qtd_free(fotg210, qtd); | |
2642 | } | |
2643 | } | |
2644 | ||
2645 | /* | |
2646 | * create a list of filled qtds for this URB; won't link into qh. | |
2647 | */ | |
2648 | static struct list_head * | |
2649 | qh_urb_transaction( | |
2650 | struct fotg210_hcd *fotg210, | |
2651 | struct urb *urb, | |
2652 | struct list_head *head, | |
2653 | gfp_t flags | |
2654 | ) { | |
2655 | struct fotg210_qtd *qtd, *qtd_prev; | |
2656 | dma_addr_t buf; | |
2657 | int len, this_sg_len, maxpacket; | |
2658 | int is_input; | |
2659 | u32 token; | |
2660 | int i; | |
2661 | struct scatterlist *sg; | |
2662 | ||
2663 | /* | |
2664 | * URBs map to sequences of QTDs: one logical transaction | |
2665 | */ | |
2666 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2667 | if (unlikely(!qtd)) | |
2668 | return NULL; | |
2669 | list_add_tail(&qtd->qtd_list, head); | |
2670 | qtd->urb = urb; | |
2671 | ||
2672 | token = QTD_STS_ACTIVE; | |
2673 | token |= (FOTG210_TUNE_CERR << 10); | |
2674 | /* for split transactions, SplitXState initialized to zero */ | |
2675 | ||
2676 | len = urb->transfer_buffer_length; | |
2677 | is_input = usb_pipein(urb->pipe); | |
2678 | if (usb_pipecontrol(urb->pipe)) { | |
2679 | /* SETUP pid */ | |
2680 | qtd_fill(fotg210, qtd, urb->setup_dma, | |
2681 | sizeof(struct usb_ctrlrequest), | |
2682 | token | (2 /* "setup" */ << 8), 8); | |
2683 | ||
2684 | /* ... and always at least one more pid */ | |
2685 | token ^= QTD_TOGGLE; | |
2686 | qtd_prev = qtd; | |
2687 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2688 | if (unlikely(!qtd)) | |
2689 | goto cleanup; | |
2690 | qtd->urb = urb; | |
2691 | qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2692 | list_add_tail(&qtd->qtd_list, head); | |
2693 | ||
2694 | /* for zero length DATA stages, STATUS is always IN */ | |
2695 | if (len == 0) | |
2696 | token |= (1 /* "in" */ << 8); | |
2697 | } | |
2698 | ||
2699 | /* | |
2700 | * data transfer stage: buffer setup | |
2701 | */ | |
2702 | i = urb->num_mapped_sgs; | |
2703 | if (len > 0 && i > 0) { | |
2704 | sg = urb->sg; | |
2705 | buf = sg_dma_address(sg); | |
2706 | ||
2707 | /* urb->transfer_buffer_length may be smaller than the | |
2708 | * size of the scatterlist (or vice versa) | |
2709 | */ | |
2710 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
2711 | } else { | |
2712 | sg = NULL; | |
2713 | buf = urb->transfer_dma; | |
2714 | this_sg_len = len; | |
2715 | } | |
2716 | ||
2717 | if (is_input) | |
2718 | token |= (1 /* "in" */ << 8); | |
2719 | /* else it's already initted to "out" pid (0 << 8) */ | |
2720 | ||
2721 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); | |
2722 | ||
2723 | /* | |
2724 | * buffer gets wrapped in one or more qtds; | |
2725 | * last one may be "short" (including zero len) | |
2726 | * and may serve as a control status ack | |
2727 | */ | |
2728 | for (;;) { | |
2729 | int this_qtd_len; | |
2730 | ||
2731 | this_qtd_len = qtd_fill(fotg210, qtd, buf, this_sg_len, token, | |
2732 | maxpacket); | |
2733 | this_sg_len -= this_qtd_len; | |
2734 | len -= this_qtd_len; | |
2735 | buf += this_qtd_len; | |
2736 | ||
2737 | /* | |
2738 | * short reads advance to a "magic" dummy instead of the next | |
2739 | * qtd ... that forces the queue to stop, for manual cleanup. | |
2740 | * (this will usually be overridden later.) | |
2741 | */ | |
2742 | if (is_input) | |
2743 | qtd->hw_alt_next = fotg210->async->hw->hw_alt_next; | |
2744 | ||
2745 | /* qh makes control packets use qtd toggle; maybe switch it */ | |
2746 | if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) | |
2747 | token ^= QTD_TOGGLE; | |
2748 | ||
2749 | if (likely(this_sg_len <= 0)) { | |
2750 | if (--i <= 0 || len <= 0) | |
2751 | break; | |
2752 | sg = sg_next(sg); | |
2753 | buf = sg_dma_address(sg); | |
2754 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
2755 | } | |
2756 | ||
2757 | qtd_prev = qtd; | |
2758 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2759 | if (unlikely(!qtd)) | |
2760 | goto cleanup; | |
2761 | qtd->urb = urb; | |
2762 | qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2763 | list_add_tail(&qtd->qtd_list, head); | |
2764 | } | |
2765 | ||
2766 | /* | |
2767 | * unless the caller requires manual cleanup after short reads, | |
2768 | * have the alt_next mechanism keep the queue running after the | |
2769 | * last data qtd (the only one, for control and most other cases). | |
2770 | */ | |
2771 | if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 | |
2772 | || usb_pipecontrol(urb->pipe))) | |
2773 | qtd->hw_alt_next = FOTG210_LIST_END(fotg210); | |
2774 | ||
2775 | /* | |
2776 | * control requests may need a terminating data "status" ack; | |
2777 | * other OUT ones may need a terminating short packet | |
2778 | * (zero length). | |
2779 | */ | |
2780 | if (likely(urb->transfer_buffer_length != 0)) { | |
2781 | int one_more = 0; | |
2782 | ||
2783 | if (usb_pipecontrol(urb->pipe)) { | |
2784 | one_more = 1; | |
2785 | token ^= 0x0100; /* "in" <--> "out" */ | |
2786 | token |= QTD_TOGGLE; /* force DATA1 */ | |
2787 | } else if (usb_pipeout(urb->pipe) | |
2788 | && (urb->transfer_flags & URB_ZERO_PACKET) | |
2789 | && !(urb->transfer_buffer_length % maxpacket)) { | |
2790 | one_more = 1; | |
2791 | } | |
2792 | if (one_more) { | |
2793 | qtd_prev = qtd; | |
2794 | qtd = fotg210_qtd_alloc(fotg210, flags); | |
2795 | if (unlikely(!qtd)) | |
2796 | goto cleanup; | |
2797 | qtd->urb = urb; | |
2798 | qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); | |
2799 | list_add_tail(&qtd->qtd_list, head); | |
2800 | ||
2801 | /* never any data in such packets */ | |
2802 | qtd_fill(fotg210, qtd, 0, 0, token, 0); | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | /* by default, enable interrupt on urb completion */ | |
2807 | if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT))) | |
2808 | qtd->hw_token |= cpu_to_hc32(fotg210, QTD_IOC); | |
2809 | return head; | |
2810 | ||
2811 | cleanup: | |
2812 | qtd_list_free(fotg210, urb, head); | |
2813 | return NULL; | |
2814 | } | |
2815 | ||
2816 | /*-------------------------------------------------------------------------*/ | |
2817 | /* | |
2818 | * Would be best to create all qh's from config descriptors, | |
2819 | * when each interface/altsetting is established. Unlink | |
2820 | * any previous qh and cancel its urbs first; endpoints are | |
2821 | * implicitly reset then (data toggle too). | |
2822 | * That'd mean updating how usbcore talks to HCDs. (2.7?) | |
2823 | */ | |
2824 | ||
2825 | ||
2826 | /* | |
2827 | * Each QH holds a qtd list; a QH is used for everything except iso. | |
2828 | * | |
2829 | * For interrupt urbs, the scheduler must set the microframe scheduling | |
2830 | * mask(s) each time the QH gets scheduled. For highspeed, that's | |
2831 | * just one microframe in the s-mask. For split interrupt transactions | |
2832 | * there are additional complications: c-mask, maybe FSTNs. | |
2833 | */ | |
2834 | static struct fotg210_qh * | |
2835 | qh_make( | |
2836 | struct fotg210_hcd *fotg210, | |
2837 | struct urb *urb, | |
2838 | gfp_t flags | |
2839 | ) { | |
2840 | struct fotg210_qh *qh = fotg210_qh_alloc(fotg210, flags); | |
2841 | u32 info1 = 0, info2 = 0; | |
2842 | int is_input, type; | |
2843 | int maxp = 0; | |
2844 | struct usb_tt *tt = urb->dev->tt; | |
2845 | struct fotg210_qh_hw *hw; | |
2846 | ||
2847 | if (!qh) | |
2848 | return qh; | |
2849 | ||
2850 | /* | |
2851 | * init endpoint/device data for this QH | |
2852 | */ | |
2853 | info1 |= usb_pipeendpoint(urb->pipe) << 8; | |
2854 | info1 |= usb_pipedevice(urb->pipe) << 0; | |
2855 | ||
2856 | is_input = usb_pipein(urb->pipe); | |
2857 | type = usb_pipetype(urb->pipe); | |
2858 | maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input); | |
2859 | ||
2860 | /* 1024 byte maxpacket is a hardware ceiling. High bandwidth | |
2861 | * acts like up to 3KB, but is built from smaller packets. | |
2862 | */ | |
2863 | if (max_packet(maxp) > 1024) { | |
2864 | fotg210_dbg(fotg210, "bogus qh maxpacket %d\n", | |
2865 | max_packet(maxp)); | |
2866 | goto done; | |
2867 | } | |
2868 | ||
2869 | /* Compute interrupt scheduling parameters just once, and save. | |
2870 | * - allowing for high bandwidth, how many nsec/uframe are used? | |
2871 | * - split transactions need a second CSPLIT uframe; same question | |
2872 | * - splits also need a schedule gap (for full/low speed I/O) | |
2873 | * - qh has a polling interval | |
2874 | * | |
2875 | * For control/bulk requests, the HC or TT handles these. | |
2876 | */ | |
2877 | if (type == PIPE_INTERRUPT) { | |
2878 | qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH, | |
2879 | is_input, 0, | |
2880 | hb_mult(maxp) * max_packet(maxp))); | |
2881 | qh->start = NO_FRAME; | |
2882 | ||
2883 | if (urb->dev->speed == USB_SPEED_HIGH) { | |
2884 | qh->c_usecs = 0; | |
2885 | qh->gap_uf = 0; | |
2886 | ||
2887 | qh->period = urb->interval >> 3; | |
2888 | if (qh->period == 0 && urb->interval != 1) { | |
2889 | /* NOTE interval 2 or 4 uframes could work. | |
2890 | * But interval 1 scheduling is simpler, and | |
2891 | * includes high bandwidth. | |
2892 | */ | |
2893 | urb->interval = 1; | |
2894 | } else if (qh->period > fotg210->periodic_size) { | |
2895 | qh->period = fotg210->periodic_size; | |
2896 | urb->interval = qh->period << 3; | |
2897 | } | |
2898 | } else { | |
2899 | int think_time; | |
2900 | ||
2901 | /* gap is f(FS/LS transfer times) */ | |
2902 | qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed, | |
2903 | is_input, 0, maxp) / (125 * 1000); | |
2904 | ||
2905 | /* FIXME this just approximates SPLIT/CSPLIT times */ | |
2906 | if (is_input) { /* SPLIT, gap, CSPLIT+DATA */ | |
2907 | qh->c_usecs = qh->usecs + HS_USECS(0); | |
2908 | qh->usecs = HS_USECS(1); | |
2909 | } else { /* SPLIT+DATA, gap, CSPLIT */ | |
2910 | qh->usecs += HS_USECS(1); | |
2911 | qh->c_usecs = HS_USECS(0); | |
2912 | } | |
2913 | ||
2914 | think_time = tt ? tt->think_time : 0; | |
2915 | qh->tt_usecs = NS_TO_US(think_time + | |
2916 | usb_calc_bus_time(urb->dev->speed, | |
2917 | is_input, 0, max_packet(maxp))); | |
2918 | qh->period = urb->interval; | |
2919 | if (qh->period > fotg210->periodic_size) { | |
2920 | qh->period = fotg210->periodic_size; | |
2921 | urb->interval = qh->period; | |
2922 | } | |
2923 | } | |
2924 | } | |
2925 | ||
2926 | /* support for tt scheduling, and access to toggles */ | |
2927 | qh->dev = urb->dev; | |
2928 | ||
2929 | /* using TT? */ | |
2930 | switch (urb->dev->speed) { | |
2931 | case USB_SPEED_LOW: | |
2932 | info1 |= QH_LOW_SPEED; | |
2933 | /* FALL THROUGH */ | |
2934 | ||
2935 | case USB_SPEED_FULL: | |
2936 | /* EPS 0 means "full" */ | |
2937 | if (type != PIPE_INTERRUPT) | |
2938 | info1 |= (FOTG210_TUNE_RL_TT << 28); | |
2939 | if (type == PIPE_CONTROL) { | |
2940 | info1 |= QH_CONTROL_EP; /* for TT */ | |
2941 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ | |
2942 | } | |
2943 | info1 |= maxp << 16; | |
2944 | ||
2945 | info2 |= (FOTG210_TUNE_MULT_TT << 30); | |
2946 | ||
2947 | /* Some Freescale processors have an erratum in which the | |
2948 | * port number in the queue head was 0..N-1 instead of 1..N. | |
2949 | */ | |
2950 | if (fotg210_has_fsl_portno_bug(fotg210)) | |
2951 | info2 |= (urb->dev->ttport-1) << 23; | |
2952 | else | |
2953 | info2 |= urb->dev->ttport << 23; | |
2954 | ||
2955 | /* set the address of the TT; for TDI's integrated | |
2956 | * root hub tt, leave it zeroed. | |
2957 | */ | |
2958 | if (tt && tt->hub != fotg210_to_hcd(fotg210)->self.root_hub) | |
2959 | info2 |= tt->hub->devnum << 16; | |
2960 | ||
2961 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ | |
2962 | ||
2963 | break; | |
2964 | ||
2965 | case USB_SPEED_HIGH: /* no TT involved */ | |
2966 | info1 |= QH_HIGH_SPEED; | |
2967 | if (type == PIPE_CONTROL) { | |
2968 | info1 |= (FOTG210_TUNE_RL_HS << 28); | |
2969 | info1 |= 64 << 16; /* usb2 fixed maxpacket */ | |
2970 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ | |
2971 | info2 |= (FOTG210_TUNE_MULT_HS << 30); | |
2972 | } else if (type == PIPE_BULK) { | |
2973 | info1 |= (FOTG210_TUNE_RL_HS << 28); | |
2974 | /* The USB spec says that high speed bulk endpoints | |
2975 | * always use 512 byte maxpacket. But some device | |
2976 | * vendors decided to ignore that, and MSFT is happy | |
2977 | * to help them do so. So now people expect to use | |
2978 | * such nonconformant devices with Linux too; sigh. | |
2979 | */ | |
2980 | info1 |= max_packet(maxp) << 16; | |
2981 | info2 |= (FOTG210_TUNE_MULT_HS << 30); | |
2982 | } else { /* PIPE_INTERRUPT */ | |
2983 | info1 |= max_packet(maxp) << 16; | |
2984 | info2 |= hb_mult(maxp) << 30; | |
2985 | } | |
2986 | break; | |
2987 | default: | |
2988 | fotg210_dbg(fotg210, "bogus dev %p speed %d\n", urb->dev, | |
2989 | urb->dev->speed); | |
2990 | done: | |
2991 | qh_destroy(fotg210, qh); | |
2992 | return NULL; | |
2993 | } | |
2994 | ||
2995 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ | |
2996 | ||
2997 | /* init as live, toggle clear, advance to dummy */ | |
2998 | qh->qh_state = QH_STATE_IDLE; | |
2999 | hw = qh->hw; | |
3000 | hw->hw_info1 = cpu_to_hc32(fotg210, info1); | |
3001 | hw->hw_info2 = cpu_to_hc32(fotg210, info2); | |
3002 | qh->is_out = !is_input; | |
3003 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1); | |
3004 | qh_refresh(fotg210, qh); | |
3005 | return qh; | |
3006 | } | |
3007 | ||
3008 | /*-------------------------------------------------------------------------*/ | |
3009 | ||
3010 | static void enable_async(struct fotg210_hcd *fotg210) | |
3011 | { | |
3012 | if (fotg210->async_count++) | |
3013 | return; | |
3014 | ||
3015 | /* Stop waiting to turn off the async schedule */ | |
3016 | fotg210->enabled_hrtimer_events &= ~BIT(FOTG210_HRTIMER_DISABLE_ASYNC); | |
3017 | ||
3018 | /* Don't start the schedule until ASS is 0 */ | |
3019 | fotg210_poll_ASS(fotg210); | |
3020 | turn_on_io_watchdog(fotg210); | |
3021 | } | |
3022 | ||
3023 | static void disable_async(struct fotg210_hcd *fotg210) | |
3024 | { | |
3025 | if (--fotg210->async_count) | |
3026 | return; | |
3027 | ||
3028 | /* The async schedule and async_unlink list are supposed to be empty */ | |
3029 | WARN_ON(fotg210->async->qh_next.qh || fotg210->async_unlink); | |
3030 | ||
3031 | /* Don't turn off the schedule until ASS is 1 */ | |
3032 | fotg210_poll_ASS(fotg210); | |
3033 | } | |
3034 | ||
3035 | /* move qh (and its qtds) onto async queue; maybe enable queue. */ | |
3036 | ||
3037 | static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3038 | { | |
3039 | __hc32 dma = QH_NEXT(fotg210, qh->qh_dma); | |
3040 | struct fotg210_qh *head; | |
3041 | ||
3042 | /* Don't link a QH if there's a Clear-TT-Buffer pending */ | |
3043 | if (unlikely(qh->clearing_tt)) | |
3044 | return; | |
3045 | ||
3046 | WARN_ON(qh->qh_state != QH_STATE_IDLE); | |
3047 | ||
3048 | /* clear halt and/or toggle; and maybe recover from silicon quirk */ | |
3049 | qh_refresh(fotg210, qh); | |
3050 | ||
3051 | /* splice right after start */ | |
3052 | head = fotg210->async; | |
3053 | qh->qh_next = head->qh_next; | |
3054 | qh->hw->hw_next = head->hw->hw_next; | |
3055 | wmb(); | |
3056 | ||
3057 | head->qh_next.qh = qh; | |
3058 | head->hw->hw_next = dma; | |
3059 | ||
3060 | qh->xacterrs = 0; | |
3061 | qh->qh_state = QH_STATE_LINKED; | |
3062 | /* qtd completions reported later by interrupt */ | |
3063 | ||
3064 | enable_async(fotg210); | |
3065 | } | |
3066 | ||
3067 | /*-------------------------------------------------------------------------*/ | |
3068 | ||
3069 | /* | |
3070 | * For control/bulk/interrupt, return QH with these TDs appended. | |
3071 | * Allocates and initializes the QH if necessary. | |
3072 | * Returns null if it can't allocate a QH it needs to. | |
3073 | * If the QH has TDs (urbs) already, that's great. | |
3074 | */ | |
3075 | static struct fotg210_qh *qh_append_tds( | |
3076 | struct fotg210_hcd *fotg210, | |
3077 | struct urb *urb, | |
3078 | struct list_head *qtd_list, | |
3079 | int epnum, | |
3080 | void **ptr | |
3081 | ) | |
3082 | { | |
3083 | struct fotg210_qh *qh = NULL; | |
3084 | __hc32 qh_addr_mask = cpu_to_hc32(fotg210, 0x7f); | |
3085 | ||
3086 | qh = (struct fotg210_qh *) *ptr; | |
3087 | if (unlikely(qh == NULL)) { | |
3088 | /* can't sleep here, we have fotg210->lock... */ | |
3089 | qh = qh_make(fotg210, urb, GFP_ATOMIC); | |
3090 | *ptr = qh; | |
3091 | } | |
3092 | if (likely(qh != NULL)) { | |
3093 | struct fotg210_qtd *qtd; | |
3094 | ||
3095 | if (unlikely(list_empty(qtd_list))) | |
3096 | qtd = NULL; | |
3097 | else | |
3098 | qtd = list_entry(qtd_list->next, struct fotg210_qtd, | |
3099 | qtd_list); | |
3100 | ||
3101 | /* control qh may need patching ... */ | |
3102 | if (unlikely(epnum == 0)) { | |
3103 | /* usb_reset_device() briefly reverts to address 0 */ | |
3104 | if (usb_pipedevice(urb->pipe) == 0) | |
3105 | qh->hw->hw_info1 &= ~qh_addr_mask; | |
3106 | } | |
3107 | ||
3108 | /* just one way to queue requests: swap with the dummy qtd. | |
3109 | * only hc or qh_refresh() ever modify the overlay. | |
3110 | */ | |
3111 | if (likely(qtd != NULL)) { | |
3112 | struct fotg210_qtd *dummy; | |
3113 | dma_addr_t dma; | |
3114 | __hc32 token; | |
3115 | ||
3116 | /* to avoid racing the HC, use the dummy td instead of | |
3117 | * the first td of our list (becomes new dummy). both | |
3118 | * tds stay deactivated until we're done, when the | |
3119 | * HC is allowed to fetch the old dummy (4.10.2). | |
3120 | */ | |
3121 | token = qtd->hw_token; | |
3122 | qtd->hw_token = HALT_BIT(fotg210); | |
3123 | ||
3124 | dummy = qh->dummy; | |
3125 | ||
3126 | dma = dummy->qtd_dma; | |
3127 | *dummy = *qtd; | |
3128 | dummy->qtd_dma = dma; | |
3129 | ||
3130 | list_del(&qtd->qtd_list); | |
3131 | list_add(&dummy->qtd_list, qtd_list); | |
3132 | list_splice_tail(qtd_list, &qh->qtd_list); | |
3133 | ||
3134 | fotg210_qtd_init(fotg210, qtd, qtd->qtd_dma); | |
3135 | qh->dummy = qtd; | |
3136 | ||
3137 | /* hc must see the new dummy at list end */ | |
3138 | dma = qtd->qtd_dma; | |
3139 | qtd = list_entry(qh->qtd_list.prev, | |
3140 | struct fotg210_qtd, qtd_list); | |
3141 | qtd->hw_next = QTD_NEXT(fotg210, dma); | |
3142 | ||
3143 | /* let the hc process these next qtds */ | |
3144 | wmb(); | |
3145 | dummy->hw_token = token; | |
3146 | ||
3147 | urb->hcpriv = qh; | |
3148 | } | |
3149 | } | |
3150 | return qh; | |
3151 | } | |
3152 | ||
3153 | /*-------------------------------------------------------------------------*/ | |
3154 | ||
3155 | static int | |
3156 | submit_async( | |
3157 | struct fotg210_hcd *fotg210, | |
3158 | struct urb *urb, | |
3159 | struct list_head *qtd_list, | |
3160 | gfp_t mem_flags | |
3161 | ) { | |
3162 | int epnum; | |
3163 | unsigned long flags; | |
3164 | struct fotg210_qh *qh = NULL; | |
3165 | int rc; | |
3166 | ||
3167 | epnum = urb->ep->desc.bEndpointAddress; | |
3168 | ||
3169 | #ifdef FOTG210_URB_TRACE | |
3170 | { | |
3171 | struct fotg210_qtd *qtd; | |
3172 | qtd = list_entry(qtd_list->next, struct fotg210_qtd, qtd_list); | |
3173 | fotg210_dbg(fotg210, | |
3174 | "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", | |
3175 | __func__, urb->dev->devpath, urb, | |
3176 | epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", | |
3177 | urb->transfer_buffer_length, | |
3178 | qtd, urb->ep->hcpriv); | |
3179 | } | |
3180 | #endif | |
3181 | ||
3182 | spin_lock_irqsave(&fotg210->lock, flags); | |
3183 | if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { | |
3184 | rc = -ESHUTDOWN; | |
3185 | goto done; | |
3186 | } | |
3187 | rc = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); | |
3188 | if (unlikely(rc)) | |
3189 | goto done; | |
3190 | ||
3191 | qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv); | |
3192 | if (unlikely(qh == NULL)) { | |
3193 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
3194 | rc = -ENOMEM; | |
3195 | goto done; | |
3196 | } | |
3197 | ||
3198 | /* Control/bulk operations through TTs don't need scheduling, | |
3199 | * the HC and TT handle it when the TT has a buffer ready. | |
3200 | */ | |
3201 | if (likely(qh->qh_state == QH_STATE_IDLE)) | |
3202 | qh_link_async(fotg210, qh); | |
3203 | done: | |
3204 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
3205 | if (unlikely(qh == NULL)) | |
3206 | qtd_list_free(fotg210, urb, qtd_list); | |
3207 | return rc; | |
3208 | } | |
3209 | ||
3210 | /*-------------------------------------------------------------------------*/ | |
3211 | ||
3212 | static void single_unlink_async(struct fotg210_hcd *fotg210, | |
3213 | struct fotg210_qh *qh) | |
3214 | { | |
3215 | struct fotg210_qh *prev; | |
3216 | ||
3217 | /* Add to the end of the list of QHs waiting for the next IAAD */ | |
3218 | qh->qh_state = QH_STATE_UNLINK; | |
3219 | if (fotg210->async_unlink) | |
3220 | fotg210->async_unlink_last->unlink_next = qh; | |
3221 | else | |
3222 | fotg210->async_unlink = qh; | |
3223 | fotg210->async_unlink_last = qh; | |
3224 | ||
3225 | /* Unlink it from the schedule */ | |
3226 | prev = fotg210->async; | |
3227 | while (prev->qh_next.qh != qh) | |
3228 | prev = prev->qh_next.qh; | |
3229 | ||
3230 | prev->hw->hw_next = qh->hw->hw_next; | |
3231 | prev->qh_next = qh->qh_next; | |
3232 | if (fotg210->qh_scan_next == qh) | |
3233 | fotg210->qh_scan_next = qh->qh_next.qh; | |
3234 | } | |
3235 | ||
3236 | static void start_iaa_cycle(struct fotg210_hcd *fotg210, bool nested) | |
3237 | { | |
3238 | /* | |
3239 | * Do nothing if an IAA cycle is already running or | |
3240 | * if one will be started shortly. | |
3241 | */ | |
3242 | if (fotg210->async_iaa || fotg210->async_unlinking) | |
3243 | return; | |
3244 | ||
3245 | /* Do all the waiting QHs at once */ | |
3246 | fotg210->async_iaa = fotg210->async_unlink; | |
3247 | fotg210->async_unlink = NULL; | |
3248 | ||
3249 | /* If the controller isn't running, we don't have to wait for it */ | |
3250 | if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) { | |
3251 | if (!nested) /* Avoid recursion */ | |
3252 | end_unlink_async(fotg210); | |
3253 | ||
3254 | /* Otherwise start a new IAA cycle */ | |
3255 | } else if (likely(fotg210->rh_state == FOTG210_RH_RUNNING)) { | |
3256 | /* Make sure the unlinks are all visible to the hardware */ | |
3257 | wmb(); | |
3258 | ||
3259 | fotg210_writel(fotg210, fotg210->command | CMD_IAAD, | |
3260 | &fotg210->regs->command); | |
3261 | fotg210_readl(fotg210, &fotg210->regs->command); | |
3262 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_IAA_WATCHDOG, | |
3263 | true); | |
3264 | } | |
3265 | } | |
3266 | ||
3267 | /* the async qh for the qtds being unlinked are now gone from the HC */ | |
3268 | ||
3269 | static void end_unlink_async(struct fotg210_hcd *fotg210) | |
3270 | { | |
3271 | struct fotg210_qh *qh; | |
3272 | ||
3273 | /* Process the idle QHs */ | |
3274 | restart: | |
3275 | fotg210->async_unlinking = true; | |
3276 | while (fotg210->async_iaa) { | |
3277 | qh = fotg210->async_iaa; | |
3278 | fotg210->async_iaa = qh->unlink_next; | |
3279 | qh->unlink_next = NULL; | |
3280 | ||
3281 | qh->qh_state = QH_STATE_IDLE; | |
3282 | qh->qh_next.qh = NULL; | |
3283 | ||
3284 | qh_completions(fotg210, qh); | |
3285 | if (!list_empty(&qh->qtd_list) && | |
3286 | fotg210->rh_state == FOTG210_RH_RUNNING) | |
3287 | qh_link_async(fotg210, qh); | |
3288 | disable_async(fotg210); | |
3289 | } | |
3290 | fotg210->async_unlinking = false; | |
3291 | ||
3292 | /* Start a new IAA cycle if any QHs are waiting for it */ | |
3293 | if (fotg210->async_unlink) { | |
3294 | start_iaa_cycle(fotg210, true); | |
3295 | if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) | |
3296 | goto restart; | |
3297 | } | |
3298 | } | |
3299 | ||
3300 | static void unlink_empty_async(struct fotg210_hcd *fotg210) | |
3301 | { | |
3302 | struct fotg210_qh *qh, *next; | |
3303 | bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING); | |
3304 | bool check_unlinks_later = false; | |
3305 | ||
3306 | /* Unlink all the async QHs that have been empty for a timer cycle */ | |
3307 | next = fotg210->async->qh_next.qh; | |
3308 | while (next) { | |
3309 | qh = next; | |
3310 | next = qh->qh_next.qh; | |
3311 | ||
3312 | if (list_empty(&qh->qtd_list) && | |
3313 | qh->qh_state == QH_STATE_LINKED) { | |
3314 | if (!stopped && qh->unlink_cycle == | |
3315 | fotg210->async_unlink_cycle) | |
3316 | check_unlinks_later = true; | |
3317 | else | |
3318 | single_unlink_async(fotg210, qh); | |
3319 | } | |
3320 | } | |
3321 | ||
3322 | /* Start a new IAA cycle if any QHs are waiting for it */ | |
3323 | if (fotg210->async_unlink) | |
3324 | start_iaa_cycle(fotg210, false); | |
3325 | ||
3326 | /* QHs that haven't been empty for long enough will be handled later */ | |
3327 | if (check_unlinks_later) { | |
3328 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_ASYNC_UNLINKS, | |
3329 | true); | |
3330 | ++fotg210->async_unlink_cycle; | |
3331 | } | |
3332 | } | |
3333 | ||
3334 | /* makes sure the async qh will become idle */ | |
3335 | /* caller must own fotg210->lock */ | |
3336 | ||
3337 | static void start_unlink_async(struct fotg210_hcd *fotg210, | |
3338 | struct fotg210_qh *qh) | |
3339 | { | |
3340 | /* | |
3341 | * If the QH isn't linked then there's nothing we can do | |
3342 | * unless we were called during a giveback, in which case | |
3343 | * qh_completions() has to deal with it. | |
3344 | */ | |
3345 | if (qh->qh_state != QH_STATE_LINKED) { | |
3346 | if (qh->qh_state == QH_STATE_COMPLETING) | |
3347 | qh->needs_rescan = 1; | |
3348 | return; | |
3349 | } | |
3350 | ||
3351 | single_unlink_async(fotg210, qh); | |
3352 | start_iaa_cycle(fotg210, false); | |
3353 | } | |
3354 | ||
3355 | /*-------------------------------------------------------------------------*/ | |
3356 | ||
3357 | static void scan_async(struct fotg210_hcd *fotg210) | |
3358 | { | |
3359 | struct fotg210_qh *qh; | |
3360 | bool check_unlinks_later = false; | |
3361 | ||
3362 | fotg210->qh_scan_next = fotg210->async->qh_next.qh; | |
3363 | while (fotg210->qh_scan_next) { | |
3364 | qh = fotg210->qh_scan_next; | |
3365 | fotg210->qh_scan_next = qh->qh_next.qh; | |
3366 | rescan: | |
3367 | /* clean any finished work for this qh */ | |
3368 | if (!list_empty(&qh->qtd_list)) { | |
3369 | int temp; | |
3370 | ||
3371 | /* | |
3372 | * Unlinks could happen here; completion reporting | |
3373 | * drops the lock. That's why fotg210->qh_scan_next | |
3374 | * always holds the next qh to scan; if the next qh | |
3375 | * gets unlinked then fotg210->qh_scan_next is adjusted | |
3376 | * in single_unlink_async(). | |
3377 | */ | |
3378 | temp = qh_completions(fotg210, qh); | |
3379 | if (qh->needs_rescan) { | |
3380 | start_unlink_async(fotg210, qh); | |
3381 | } else if (list_empty(&qh->qtd_list) | |
3382 | && qh->qh_state == QH_STATE_LINKED) { | |
3383 | qh->unlink_cycle = fotg210->async_unlink_cycle; | |
3384 | check_unlinks_later = true; | |
3385 | } else if (temp != 0) | |
3386 | goto rescan; | |
3387 | } | |
3388 | } | |
3389 | ||
3390 | /* | |
3391 | * Unlink empty entries, reducing DMA usage as well | |
3392 | * as HCD schedule-scanning costs. Delay for any qh | |
3393 | * we just scanned, there's a not-unusual case that it | |
3394 | * doesn't stay idle for long. | |
3395 | */ | |
3396 | if (check_unlinks_later && fotg210->rh_state == FOTG210_RH_RUNNING && | |
3397 | !(fotg210->enabled_hrtimer_events & | |
3398 | BIT(FOTG210_HRTIMER_ASYNC_UNLINKS))) { | |
3399 | fotg210_enable_event(fotg210, | |
3400 | FOTG210_HRTIMER_ASYNC_UNLINKS, true); | |
3401 | ++fotg210->async_unlink_cycle; | |
3402 | } | |
3403 | } | |
3404 | /*-------------------------------------------------------------------------*/ | |
3405 | /* | |
3406 | * EHCI scheduled transaction support: interrupt, iso, split iso | |
3407 | * These are called "periodic" transactions in the EHCI spec. | |
3408 | * | |
3409 | * Note that for interrupt transfers, the QH/QTD manipulation is shared | |
3410 | * with the "asynchronous" transaction support (control/bulk transfers). | |
3411 | * The only real difference is in how interrupt transfers are scheduled. | |
3412 | * | |
3413 | * For ISO, we make an "iso_stream" head to serve the same role as a QH. | |
3414 | * It keeps track of every ITD (or SITD) that's linked, and holds enough | |
3415 | * pre-calculated schedule data to make appending to the queue be quick. | |
3416 | */ | |
3417 | ||
3418 | static int fotg210_get_frame(struct usb_hcd *hcd); | |
3419 | ||
3420 | /*-------------------------------------------------------------------------*/ | |
3421 | ||
3422 | /* | |
3423 | * periodic_next_shadow - return "next" pointer on shadow list | |
3424 | * @periodic: host pointer to qh/itd | |
3425 | * @tag: hardware tag for type of this record | |
3426 | */ | |
3427 | static union fotg210_shadow * | |
3428 | periodic_next_shadow(struct fotg210_hcd *fotg210, | |
3429 | union fotg210_shadow *periodic, __hc32 tag) | |
3430 | { | |
3431 | switch (hc32_to_cpu(fotg210, tag)) { | |
3432 | case Q_TYPE_QH: | |
3433 | return &periodic->qh->qh_next; | |
3434 | case Q_TYPE_FSTN: | |
3435 | return &periodic->fstn->fstn_next; | |
3436 | default: | |
3437 | return &periodic->itd->itd_next; | |
3438 | } | |
3439 | } | |
3440 | ||
3441 | static __hc32 * | |
3442 | shadow_next_periodic(struct fotg210_hcd *fotg210, | |
3443 | union fotg210_shadow *periodic, __hc32 tag) | |
3444 | { | |
3445 | switch (hc32_to_cpu(fotg210, tag)) { | |
3446 | /* our fotg210_shadow.qh is actually software part */ | |
3447 | case Q_TYPE_QH: | |
3448 | return &periodic->qh->hw->hw_next; | |
3449 | /* others are hw parts */ | |
3450 | default: | |
3451 | return periodic->hw_next; | |
3452 | } | |
3453 | } | |
3454 | ||
3455 | /* caller must hold fotg210->lock */ | |
3456 | static void periodic_unlink(struct fotg210_hcd *fotg210, unsigned frame, | |
3457 | void *ptr) | |
3458 | { | |
3459 | union fotg210_shadow *prev_p = &fotg210->pshadow[frame]; | |
3460 | __hc32 *hw_p = &fotg210->periodic[frame]; | |
3461 | union fotg210_shadow here = *prev_p; | |
3462 | ||
3463 | /* find predecessor of "ptr"; hw and shadow lists are in sync */ | |
3464 | while (here.ptr && here.ptr != ptr) { | |
3465 | prev_p = periodic_next_shadow(fotg210, prev_p, | |
3466 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3467 | hw_p = shadow_next_periodic(fotg210, &here, | |
3468 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3469 | here = *prev_p; | |
3470 | } | |
3471 | /* an interrupt entry (at list end) could have been shared */ | |
3472 | if (!here.ptr) | |
3473 | return; | |
3474 | ||
3475 | /* update shadow and hardware lists ... the old "next" pointers | |
3476 | * from ptr may still be in use, the caller updates them. | |
3477 | */ | |
3478 | *prev_p = *periodic_next_shadow(fotg210, &here, | |
3479 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3480 | ||
3481 | *hw_p = *shadow_next_periodic(fotg210, &here, | |
3482 | Q_NEXT_TYPE(fotg210, *hw_p)); | |
3483 | } | |
3484 | ||
3485 | /* how many of the uframe's 125 usecs are allocated? */ | |
3486 | static unsigned short | |
3487 | periodic_usecs(struct fotg210_hcd *fotg210, unsigned frame, unsigned uframe) | |
3488 | { | |
3489 | __hc32 *hw_p = &fotg210->periodic[frame]; | |
3490 | union fotg210_shadow *q = &fotg210->pshadow[frame]; | |
3491 | unsigned usecs = 0; | |
3492 | struct fotg210_qh_hw *hw; | |
3493 | ||
3494 | while (q->ptr) { | |
3495 | switch (hc32_to_cpu(fotg210, Q_NEXT_TYPE(fotg210, *hw_p))) { | |
3496 | case Q_TYPE_QH: | |
3497 | hw = q->qh->hw; | |
3498 | /* is it in the S-mask? */ | |
3499 | if (hw->hw_info2 & cpu_to_hc32(fotg210, 1 << uframe)) | |
3500 | usecs += q->qh->usecs; | |
3501 | /* ... or C-mask? */ | |
3502 | if (hw->hw_info2 & cpu_to_hc32(fotg210, | |
3503 | 1 << (8 + uframe))) | |
3504 | usecs += q->qh->c_usecs; | |
3505 | hw_p = &hw->hw_next; | |
3506 | q = &q->qh->qh_next; | |
3507 | break; | |
3508 | /* case Q_TYPE_FSTN: */ | |
3509 | default: | |
3510 | /* for "save place" FSTNs, count the relevant INTR | |
3511 | * bandwidth from the previous frame | |
3512 | */ | |
3513 | if (q->fstn->hw_prev != FOTG210_LIST_END(fotg210)) | |
3514 | fotg210_dbg(fotg210, "ignoring FSTN cost ...\n"); | |
3515 | ||
3516 | hw_p = &q->fstn->hw_next; | |
3517 | q = &q->fstn->fstn_next; | |
3518 | break; | |
3519 | case Q_TYPE_ITD: | |
3520 | if (q->itd->hw_transaction[uframe]) | |
3521 | usecs += q->itd->stream->usecs; | |
3522 | hw_p = &q->itd->hw_next; | |
3523 | q = &q->itd->itd_next; | |
3524 | break; | |
3525 | } | |
3526 | } | |
7d50195f FHC |
3527 | if (usecs > fotg210->uframe_periodic_max) |
3528 | fotg210_err(fotg210, "uframe %d sched overrun: %d usecs\n", | |
3529 | frame * 8 + uframe, usecs); | |
7d50195f FHC |
3530 | return usecs; |
3531 | } | |
3532 | ||
3533 | /*-------------------------------------------------------------------------*/ | |
3534 | ||
3535 | static int same_tt(struct usb_device *dev1, struct usb_device *dev2) | |
3536 | { | |
3537 | if (!dev1->tt || !dev2->tt) | |
3538 | return 0; | |
3539 | if (dev1->tt != dev2->tt) | |
3540 | return 0; | |
3541 | if (dev1->tt->multi) | |
3542 | return dev1->ttport == dev2->ttport; | |
3543 | else | |
3544 | return 1; | |
3545 | } | |
3546 | ||
3547 | /* return true iff the device's transaction translator is available | |
3548 | * for a periodic transfer starting at the specified frame, using | |
3549 | * all the uframes in the mask. | |
3550 | */ | |
3551 | static int tt_no_collision( | |
3552 | struct fotg210_hcd *fotg210, | |
3553 | unsigned period, | |
3554 | struct usb_device *dev, | |
3555 | unsigned frame, | |
3556 | u32 uf_mask | |
3557 | ) | |
3558 | { | |
3559 | if (period == 0) /* error */ | |
3560 | return 0; | |
3561 | ||
3562 | /* note bandwidth wastage: split never follows csplit | |
3563 | * (different dev or endpoint) until the next uframe. | |
3564 | * calling convention doesn't make that distinction. | |
3565 | */ | |
3566 | for (; frame < fotg210->periodic_size; frame += period) { | |
3567 | union fotg210_shadow here; | |
3568 | __hc32 type; | |
3569 | struct fotg210_qh_hw *hw; | |
3570 | ||
3571 | here = fotg210->pshadow[frame]; | |
3572 | type = Q_NEXT_TYPE(fotg210, fotg210->periodic[frame]); | |
3573 | while (here.ptr) { | |
3574 | switch (hc32_to_cpu(fotg210, type)) { | |
3575 | case Q_TYPE_ITD: | |
3576 | type = Q_NEXT_TYPE(fotg210, here.itd->hw_next); | |
3577 | here = here.itd->itd_next; | |
3578 | continue; | |
3579 | case Q_TYPE_QH: | |
3580 | hw = here.qh->hw; | |
3581 | if (same_tt(dev, here.qh->dev)) { | |
3582 | u32 mask; | |
3583 | ||
3584 | mask = hc32_to_cpu(fotg210, | |
3585 | hw->hw_info2); | |
3586 | /* "knows" no gap is needed */ | |
3587 | mask |= mask >> 8; | |
3588 | if (mask & uf_mask) | |
3589 | break; | |
3590 | } | |
3591 | type = Q_NEXT_TYPE(fotg210, hw->hw_next); | |
3592 | here = here.qh->qh_next; | |
3593 | continue; | |
3594 | /* case Q_TYPE_FSTN: */ | |
3595 | default: | |
3596 | fotg210_dbg(fotg210, | |
3597 | "periodic frame %d bogus type %d\n", | |
3598 | frame, type); | |
3599 | } | |
3600 | ||
3601 | /* collision or error */ | |
3602 | return 0; | |
3603 | } | |
3604 | } | |
3605 | ||
3606 | /* no collision */ | |
3607 | return 1; | |
3608 | } | |
3609 | ||
3610 | /*-------------------------------------------------------------------------*/ | |
3611 | ||
3612 | static void enable_periodic(struct fotg210_hcd *fotg210) | |
3613 | { | |
3614 | if (fotg210->periodic_count++) | |
3615 | return; | |
3616 | ||
3617 | /* Stop waiting to turn off the periodic schedule */ | |
3618 | fotg210->enabled_hrtimer_events &= | |
3619 | ~BIT(FOTG210_HRTIMER_DISABLE_PERIODIC); | |
3620 | ||
3621 | /* Don't start the schedule until PSS is 0 */ | |
3622 | fotg210_poll_PSS(fotg210); | |
3623 | turn_on_io_watchdog(fotg210); | |
3624 | } | |
3625 | ||
3626 | static void disable_periodic(struct fotg210_hcd *fotg210) | |
3627 | { | |
3628 | if (--fotg210->periodic_count) | |
3629 | return; | |
3630 | ||
3631 | /* Don't turn off the schedule until PSS is 1 */ | |
3632 | fotg210_poll_PSS(fotg210); | |
3633 | } | |
3634 | ||
3635 | /*-------------------------------------------------------------------------*/ | |
3636 | ||
3637 | /* periodic schedule slots have iso tds (normal or split) first, then a | |
3638 | * sparse tree for active interrupt transfers. | |
3639 | * | |
3640 | * this just links in a qh; caller guarantees uframe masks are set right. | |
3641 | * no FSTN support (yet; fotg210 0.96+) | |
3642 | */ | |
3643 | static void qh_link_periodic(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3644 | { | |
3645 | unsigned i; | |
3646 | unsigned period = qh->period; | |
3647 | ||
3648 | dev_dbg(&qh->dev->dev, | |
3649 | "link qh%d-%04x/%p start %d [%d/%d us]\n", | |
3650 | period, hc32_to_cpup(fotg210, &qh->hw->hw_info2) | |
3651 | & (QH_CMASK | QH_SMASK), | |
3652 | qh, qh->start, qh->usecs, qh->c_usecs); | |
3653 | ||
3654 | /* high bandwidth, or otherwise every microframe */ | |
3655 | if (period == 0) | |
3656 | period = 1; | |
3657 | ||
3658 | for (i = qh->start; i < fotg210->periodic_size; i += period) { | |
3659 | union fotg210_shadow *prev = &fotg210->pshadow[i]; | |
3660 | __hc32 *hw_p = &fotg210->periodic[i]; | |
3661 | union fotg210_shadow here = *prev; | |
3662 | __hc32 type = 0; | |
3663 | ||
3664 | /* skip the iso nodes at list head */ | |
3665 | while (here.ptr) { | |
3666 | type = Q_NEXT_TYPE(fotg210, *hw_p); | |
3667 | if (type == cpu_to_hc32(fotg210, Q_TYPE_QH)) | |
3668 | break; | |
3669 | prev = periodic_next_shadow(fotg210, prev, type); | |
3670 | hw_p = shadow_next_periodic(fotg210, &here, type); | |
3671 | here = *prev; | |
3672 | } | |
3673 | ||
3674 | /* sorting each branch by period (slow-->fast) | |
3675 | * enables sharing interior tree nodes | |
3676 | */ | |
3677 | while (here.ptr && qh != here.qh) { | |
3678 | if (qh->period > here.qh->period) | |
3679 | break; | |
3680 | prev = &here.qh->qh_next; | |
3681 | hw_p = &here.qh->hw->hw_next; | |
3682 | here = *prev; | |
3683 | } | |
3684 | /* link in this qh, unless some earlier pass did that */ | |
3685 | if (qh != here.qh) { | |
3686 | qh->qh_next = here; | |
3687 | if (here.qh) | |
3688 | qh->hw->hw_next = *hw_p; | |
3689 | wmb(); | |
3690 | prev->qh = qh; | |
3691 | *hw_p = QH_NEXT(fotg210, qh->qh_dma); | |
3692 | } | |
3693 | } | |
3694 | qh->qh_state = QH_STATE_LINKED; | |
3695 | qh->xacterrs = 0; | |
3696 | ||
3697 | /* update per-qh bandwidth for usbfs */ | |
3698 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated += qh->period | |
3699 | ? ((qh->usecs + qh->c_usecs) / qh->period) | |
3700 | : (qh->usecs * 8); | |
3701 | ||
3702 | list_add(&qh->intr_node, &fotg210->intr_qh_list); | |
3703 | ||
3704 | /* maybe enable periodic schedule processing */ | |
3705 | ++fotg210->intr_count; | |
3706 | enable_periodic(fotg210); | |
3707 | } | |
3708 | ||
3709 | static void qh_unlink_periodic(struct fotg210_hcd *fotg210, | |
3710 | struct fotg210_qh *qh) | |
3711 | { | |
3712 | unsigned i; | |
3713 | unsigned period; | |
3714 | ||
3715 | /* | |
3716 | * If qh is for a low/full-speed device, simply unlinking it | |
3717 | * could interfere with an ongoing split transaction. To unlink | |
3718 | * it safely would require setting the QH_INACTIVATE bit and | |
3719 | * waiting at least one frame, as described in EHCI 4.12.2.5. | |
3720 | * | |
3721 | * We won't bother with any of this. Instead, we assume that the | |
3722 | * only reason for unlinking an interrupt QH while the current URB | |
3723 | * is still active is to dequeue all the URBs (flush the whole | |
3724 | * endpoint queue). | |
3725 | * | |
3726 | * If rebalancing the periodic schedule is ever implemented, this | |
3727 | * approach will no longer be valid. | |
3728 | */ | |
3729 | ||
3730 | /* high bandwidth, or otherwise part of every microframe */ | |
3731 | period = qh->period; | |
3732 | if (!period) | |
3733 | period = 1; | |
3734 | ||
3735 | for (i = qh->start; i < fotg210->periodic_size; i += period) | |
3736 | periodic_unlink(fotg210, i, qh); | |
3737 | ||
3738 | /* update per-qh bandwidth for usbfs */ | |
3739 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated -= qh->period | |
3740 | ? ((qh->usecs + qh->c_usecs) / qh->period) | |
3741 | : (qh->usecs * 8); | |
3742 | ||
3743 | dev_dbg(&qh->dev->dev, | |
3744 | "unlink qh%d-%04x/%p start %d [%d/%d us]\n", | |
3745 | qh->period, | |
3746 | hc32_to_cpup(fotg210, &qh->hw->hw_info2) & | |
3747 | (QH_CMASK | QH_SMASK), qh, qh->start, qh->usecs, qh->c_usecs); | |
3748 | ||
3749 | /* qh->qh_next still "live" to HC */ | |
3750 | qh->qh_state = QH_STATE_UNLINK; | |
3751 | qh->qh_next.ptr = NULL; | |
3752 | ||
3753 | if (fotg210->qh_scan_next == qh) | |
3754 | fotg210->qh_scan_next = list_entry(qh->intr_node.next, | |
3755 | struct fotg210_qh, intr_node); | |
3756 | list_del(&qh->intr_node); | |
3757 | } | |
3758 | ||
3759 | static void start_unlink_intr(struct fotg210_hcd *fotg210, | |
3760 | struct fotg210_qh *qh) | |
3761 | { | |
3762 | /* If the QH isn't linked then there's nothing we can do | |
3763 | * unless we were called during a giveback, in which case | |
3764 | * qh_completions() has to deal with it. | |
3765 | */ | |
3766 | if (qh->qh_state != QH_STATE_LINKED) { | |
3767 | if (qh->qh_state == QH_STATE_COMPLETING) | |
3768 | qh->needs_rescan = 1; | |
3769 | return; | |
3770 | } | |
3771 | ||
3772 | qh_unlink_periodic(fotg210, qh); | |
3773 | ||
3774 | /* Make sure the unlinks are visible before starting the timer */ | |
3775 | wmb(); | |
3776 | ||
3777 | /* | |
3778 | * The EHCI spec doesn't say how long it takes the controller to | |
3779 | * stop accessing an unlinked interrupt QH. The timer delay is | |
3780 | * 9 uframes; presumably that will be long enough. | |
3781 | */ | |
3782 | qh->unlink_cycle = fotg210->intr_unlink_cycle; | |
3783 | ||
3784 | /* New entries go at the end of the intr_unlink list */ | |
3785 | if (fotg210->intr_unlink) | |
3786 | fotg210->intr_unlink_last->unlink_next = qh; | |
3787 | else | |
3788 | fotg210->intr_unlink = qh; | |
3789 | fotg210->intr_unlink_last = qh; | |
3790 | ||
3791 | if (fotg210->intr_unlinking) | |
3792 | ; /* Avoid recursive calls */ | |
3793 | else if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
3794 | fotg210_handle_intr_unlinks(fotg210); | |
3795 | else if (fotg210->intr_unlink == qh) { | |
3796 | fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR, | |
3797 | true); | |
3798 | ++fotg210->intr_unlink_cycle; | |
3799 | } | |
3800 | } | |
3801 | ||
3802 | static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3803 | { | |
3804 | struct fotg210_qh_hw *hw = qh->hw; | |
3805 | int rc; | |
3806 | ||
3807 | qh->qh_state = QH_STATE_IDLE; | |
3808 | hw->hw_next = FOTG210_LIST_END(fotg210); | |
3809 | ||
3810 | qh_completions(fotg210, qh); | |
3811 | ||
3812 | /* reschedule QH iff another request is queued */ | |
3813 | if (!list_empty(&qh->qtd_list) && | |
3814 | fotg210->rh_state == FOTG210_RH_RUNNING) { | |
3815 | rc = qh_schedule(fotg210, qh); | |
3816 | ||
3817 | /* An error here likely indicates handshake failure | |
3818 | * or no space left in the schedule. Neither fault | |
3819 | * should happen often ... | |
3820 | * | |
3821 | * FIXME kill the now-dysfunctional queued urbs | |
3822 | */ | |
3823 | if (rc != 0) | |
3824 | fotg210_err(fotg210, "can't reschedule qh %p, err %d\n", | |
3825 | qh, rc); | |
3826 | } | |
3827 | ||
3828 | /* maybe turn off periodic schedule */ | |
3829 | --fotg210->intr_count; | |
3830 | disable_periodic(fotg210); | |
3831 | } | |
3832 | ||
3833 | /*-------------------------------------------------------------------------*/ | |
3834 | ||
3835 | static int check_period( | |
3836 | struct fotg210_hcd *fotg210, | |
3837 | unsigned frame, | |
3838 | unsigned uframe, | |
3839 | unsigned period, | |
3840 | unsigned usecs | |
3841 | ) { | |
3842 | int claimed; | |
3843 | ||
3844 | /* complete split running into next frame? | |
3845 | * given FSTN support, we could sometimes check... | |
3846 | */ | |
3847 | if (uframe >= 8) | |
3848 | return 0; | |
3849 | ||
3850 | /* convert "usecs we need" to "max already claimed" */ | |
3851 | usecs = fotg210->uframe_periodic_max - usecs; | |
3852 | ||
3853 | /* we "know" 2 and 4 uframe intervals were rejected; so | |
3854 | * for period 0, check _every_ microframe in the schedule. | |
3855 | */ | |
3856 | if (unlikely(period == 0)) { | |
3857 | do { | |
3858 | for (uframe = 0; uframe < 7; uframe++) { | |
3859 | claimed = periodic_usecs(fotg210, frame, | |
3860 | uframe); | |
3861 | if (claimed > usecs) | |
3862 | return 0; | |
3863 | } | |
3864 | } while ((frame += 1) < fotg210->periodic_size); | |
3865 | ||
3866 | /* just check the specified uframe, at that period */ | |
3867 | } else { | |
3868 | do { | |
3869 | claimed = periodic_usecs(fotg210, frame, uframe); | |
3870 | if (claimed > usecs) | |
3871 | return 0; | |
3872 | } while ((frame += period) < fotg210->periodic_size); | |
3873 | } | |
3874 | ||
3875 | /* success! */ | |
3876 | return 1; | |
3877 | } | |
3878 | ||
3879 | static int check_intr_schedule( | |
3880 | struct fotg210_hcd *fotg210, | |
3881 | unsigned frame, | |
3882 | unsigned uframe, | |
3883 | const struct fotg210_qh *qh, | |
3884 | __hc32 *c_maskp | |
3885 | ) | |
3886 | { | |
3887 | int retval = -ENOSPC; | |
3888 | u8 mask = 0; | |
3889 | ||
3890 | if (qh->c_usecs && uframe >= 6) /* FSTN territory? */ | |
3891 | goto done; | |
3892 | ||
3893 | if (!check_period(fotg210, frame, uframe, qh->period, qh->usecs)) | |
3894 | goto done; | |
3895 | if (!qh->c_usecs) { | |
3896 | retval = 0; | |
3897 | *c_maskp = 0; | |
3898 | goto done; | |
3899 | } | |
3900 | ||
3901 | /* Make sure this tt's buffer is also available for CSPLITs. | |
3902 | * We pessimize a bit; probably the typical full speed case | |
3903 | * doesn't need the second CSPLIT. | |
3904 | * | |
3905 | * NOTE: both SPLIT and CSPLIT could be checked in just | |
3906 | * one smart pass... | |
3907 | */ | |
3908 | mask = 0x03 << (uframe + qh->gap_uf); | |
3909 | *c_maskp = cpu_to_hc32(fotg210, mask << 8); | |
3910 | ||
3911 | mask |= 1 << uframe; | |
3912 | if (tt_no_collision(fotg210, qh->period, qh->dev, frame, mask)) { | |
3913 | if (!check_period(fotg210, frame, uframe + qh->gap_uf + 1, | |
3914 | qh->period, qh->c_usecs)) | |
3915 | goto done; | |
3916 | if (!check_period(fotg210, frame, uframe + qh->gap_uf, | |
3917 | qh->period, qh->c_usecs)) | |
3918 | goto done; | |
3919 | retval = 0; | |
3920 | } | |
3921 | done: | |
3922 | return retval; | |
3923 | } | |
3924 | ||
3925 | /* "first fit" scheduling policy used the first time through, | |
3926 | * or when the previous schedule slot can't be re-used. | |
3927 | */ | |
3928 | static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) | |
3929 | { | |
3930 | int status; | |
3931 | unsigned uframe; | |
3932 | __hc32 c_mask; | |
3933 | unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */ | |
3934 | struct fotg210_qh_hw *hw = qh->hw; | |
3935 | ||
3936 | qh_refresh(fotg210, qh); | |
3937 | hw->hw_next = FOTG210_LIST_END(fotg210); | |
3938 | frame = qh->start; | |
3939 | ||
3940 | /* reuse the previous schedule slots, if we can */ | |
3941 | if (frame < qh->period) { | |
3942 | uframe = ffs(hc32_to_cpup(fotg210, &hw->hw_info2) & QH_SMASK); | |
3943 | status = check_intr_schedule(fotg210, frame, --uframe, | |
3944 | qh, &c_mask); | |
3945 | } else { | |
3946 | uframe = 0; | |
3947 | c_mask = 0; | |
3948 | status = -ENOSPC; | |
3949 | } | |
3950 | ||
3951 | /* else scan the schedule to find a group of slots such that all | |
3952 | * uframes have enough periodic bandwidth available. | |
3953 | */ | |
3954 | if (status) { | |
3955 | /* "normal" case, uframing flexible except with splits */ | |
3956 | if (qh->period) { | |
3957 | int i; | |
3958 | ||
3959 | for (i = qh->period; status && i > 0; --i) { | |
3960 | frame = ++fotg210->random_frame % qh->period; | |
3961 | for (uframe = 0; uframe < 8; uframe++) { | |
3962 | status = check_intr_schedule(fotg210, | |
3963 | frame, uframe, qh, | |
3964 | &c_mask); | |
3965 | if (status == 0) | |
3966 | break; | |
3967 | } | |
3968 | } | |
3969 | ||
3970 | /* qh->period == 0 means every uframe */ | |
3971 | } else { | |
3972 | frame = 0; | |
3973 | status = check_intr_schedule(fotg210, 0, 0, qh, | |
3974 | &c_mask); | |
3975 | } | |
3976 | if (status) | |
3977 | goto done; | |
3978 | qh->start = frame; | |
3979 | ||
3980 | /* reset S-frame and (maybe) C-frame masks */ | |
3981 | hw->hw_info2 &= cpu_to_hc32(fotg210, ~(QH_CMASK | QH_SMASK)); | |
3982 | hw->hw_info2 |= qh->period | |
3983 | ? cpu_to_hc32(fotg210, 1 << uframe) | |
3984 | : cpu_to_hc32(fotg210, QH_SMASK); | |
3985 | hw->hw_info2 |= c_mask; | |
3986 | } else | |
3987 | fotg210_dbg(fotg210, "reused qh %p schedule\n", qh); | |
3988 | ||
3989 | /* stuff into the periodic schedule */ | |
3990 | qh_link_periodic(fotg210, qh); | |
3991 | done: | |
3992 | return status; | |
3993 | } | |
3994 | ||
3995 | static int intr_submit( | |
3996 | struct fotg210_hcd *fotg210, | |
3997 | struct urb *urb, | |
3998 | struct list_head *qtd_list, | |
3999 | gfp_t mem_flags | |
4000 | ) { | |
4001 | unsigned epnum; | |
4002 | unsigned long flags; | |
4003 | struct fotg210_qh *qh; | |
4004 | int status; | |
4005 | struct list_head empty; | |
4006 | ||
4007 | /* get endpoint and transfer/schedule data */ | |
4008 | epnum = urb->ep->desc.bEndpointAddress; | |
4009 | ||
4010 | spin_lock_irqsave(&fotg210->lock, flags); | |
4011 | ||
4012 | if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { | |
4013 | status = -ESHUTDOWN; | |
4014 | goto done_not_linked; | |
4015 | } | |
4016 | status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); | |
4017 | if (unlikely(status)) | |
4018 | goto done_not_linked; | |
4019 | ||
4020 | /* get qh and force any scheduling errors */ | |
4021 | INIT_LIST_HEAD(&empty); | |
4022 | qh = qh_append_tds(fotg210, urb, &empty, epnum, &urb->ep->hcpriv); | |
4023 | if (qh == NULL) { | |
4024 | status = -ENOMEM; | |
4025 | goto done; | |
4026 | } | |
4027 | if (qh->qh_state == QH_STATE_IDLE) { | |
4028 | status = qh_schedule(fotg210, qh); | |
4029 | if (status) | |
4030 | goto done; | |
4031 | } | |
4032 | ||
4033 | /* then queue the urb's tds to the qh */ | |
4034 | qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv); | |
4035 | BUG_ON(qh == NULL); | |
4036 | ||
4037 | /* ... update usbfs periodic stats */ | |
4038 | fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs++; | |
4039 | ||
4040 | done: | |
4041 | if (unlikely(status)) | |
4042 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
4043 | done_not_linked: | |
4044 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4045 | if (status) | |
4046 | qtd_list_free(fotg210, urb, qtd_list); | |
4047 | ||
4048 | return status; | |
4049 | } | |
4050 | ||
4051 | static void scan_intr(struct fotg210_hcd *fotg210) | |
4052 | { | |
4053 | struct fotg210_qh *qh; | |
4054 | ||
4055 | list_for_each_entry_safe(qh, fotg210->qh_scan_next, | |
4056 | &fotg210->intr_qh_list, intr_node) { | |
4057 | rescan: | |
4058 | /* clean any finished work for this qh */ | |
4059 | if (!list_empty(&qh->qtd_list)) { | |
4060 | int temp; | |
4061 | ||
4062 | /* | |
4063 | * Unlinks could happen here; completion reporting | |
4064 | * drops the lock. That's why fotg210->qh_scan_next | |
4065 | * always holds the next qh to scan; if the next qh | |
4066 | * gets unlinked then fotg210->qh_scan_next is adjusted | |
4067 | * in qh_unlink_periodic(). | |
4068 | */ | |
4069 | temp = qh_completions(fotg210, qh); | |
4070 | if (unlikely(qh->needs_rescan || | |
4071 | (list_empty(&qh->qtd_list) && | |
4072 | qh->qh_state == QH_STATE_LINKED))) | |
4073 | start_unlink_intr(fotg210, qh); | |
4074 | else if (temp != 0) | |
4075 | goto rescan; | |
4076 | } | |
4077 | } | |
4078 | } | |
4079 | ||
4080 | /*-------------------------------------------------------------------------*/ | |
4081 | ||
4082 | /* fotg210_iso_stream ops work with both ITD and SITD */ | |
4083 | ||
4084 | static struct fotg210_iso_stream * | |
4085 | iso_stream_alloc(gfp_t mem_flags) | |
4086 | { | |
4087 | struct fotg210_iso_stream *stream; | |
4088 | ||
4089 | stream = kzalloc(sizeof(*stream), mem_flags); | |
4090 | if (likely(stream != NULL)) { | |
4091 | INIT_LIST_HEAD(&stream->td_list); | |
4092 | INIT_LIST_HEAD(&stream->free_list); | |
4093 | stream->next_uframe = -1; | |
4094 | } | |
4095 | return stream; | |
4096 | } | |
4097 | ||
4098 | static void | |
4099 | iso_stream_init( | |
4100 | struct fotg210_hcd *fotg210, | |
4101 | struct fotg210_iso_stream *stream, | |
4102 | struct usb_device *dev, | |
4103 | int pipe, | |
4104 | unsigned interval | |
4105 | ) | |
4106 | { | |
4107 | u32 buf1; | |
4108 | unsigned epnum, maxp; | |
4109 | int is_input; | |
4110 | long bandwidth; | |
4111 | unsigned multi; | |
4112 | ||
4113 | /* | |
4114 | * this might be a "high bandwidth" highspeed endpoint, | |
4115 | * as encoded in the ep descriptor's wMaxPacket field | |
4116 | */ | |
4117 | epnum = usb_pipeendpoint(pipe); | |
4118 | is_input = usb_pipein(pipe) ? USB_DIR_IN : 0; | |
4119 | maxp = usb_maxpacket(dev, pipe, !is_input); | |
4120 | if (is_input) | |
4121 | buf1 = (1 << 11); | |
4122 | else | |
4123 | buf1 = 0; | |
4124 | ||
4125 | maxp = max_packet(maxp); | |
4126 | multi = hb_mult(maxp); | |
4127 | buf1 |= maxp; | |
4128 | maxp *= multi; | |
4129 | ||
4130 | stream->buf0 = cpu_to_hc32(fotg210, (epnum << 8) | dev->devnum); | |
4131 | stream->buf1 = cpu_to_hc32(fotg210, buf1); | |
4132 | stream->buf2 = cpu_to_hc32(fotg210, multi); | |
4133 | ||
4134 | /* usbfs wants to report the average usecs per frame tied up | |
4135 | * when transfers on this endpoint are scheduled ... | |
4136 | */ | |
4137 | if (dev->speed == USB_SPEED_FULL) { | |
4138 | interval <<= 3; | |
4139 | stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed, | |
4140 | is_input, 1, maxp)); | |
4141 | stream->usecs /= 8; | |
4142 | } else { | |
4143 | stream->highspeed = 1; | |
4144 | stream->usecs = HS_USECS_ISO(maxp); | |
4145 | } | |
4146 | bandwidth = stream->usecs * 8; | |
4147 | bandwidth /= interval; | |
4148 | ||
4149 | stream->bandwidth = bandwidth; | |
4150 | stream->udev = dev; | |
4151 | stream->bEndpointAddress = is_input | epnum; | |
4152 | stream->interval = interval; | |
4153 | stream->maxp = maxp; | |
4154 | } | |
4155 | ||
4156 | static struct fotg210_iso_stream * | |
4157 | iso_stream_find(struct fotg210_hcd *fotg210, struct urb *urb) | |
4158 | { | |
4159 | unsigned epnum; | |
4160 | struct fotg210_iso_stream *stream; | |
4161 | struct usb_host_endpoint *ep; | |
4162 | unsigned long flags; | |
4163 | ||
4164 | epnum = usb_pipeendpoint(urb->pipe); | |
4165 | if (usb_pipein(urb->pipe)) | |
4166 | ep = urb->dev->ep_in[epnum]; | |
4167 | else | |
4168 | ep = urb->dev->ep_out[epnum]; | |
4169 | ||
4170 | spin_lock_irqsave(&fotg210->lock, flags); | |
4171 | stream = ep->hcpriv; | |
4172 | ||
4173 | if (unlikely(stream == NULL)) { | |
4174 | stream = iso_stream_alloc(GFP_ATOMIC); | |
4175 | if (likely(stream != NULL)) { | |
4176 | ep->hcpriv = stream; | |
4177 | stream->ep = ep; | |
4178 | iso_stream_init(fotg210, stream, urb->dev, urb->pipe, | |
4179 | urb->interval); | |
4180 | } | |
4181 | ||
4182 | /* if dev->ep[epnum] is a QH, hw is set */ | |
4183 | } else if (unlikely(stream->hw != NULL)) { | |
4184 | fotg210_dbg(fotg210, "dev %s ep%d%s, not iso??\n", | |
4185 | urb->dev->devpath, epnum, | |
4186 | usb_pipein(urb->pipe) ? "in" : "out"); | |
4187 | stream = NULL; | |
4188 | } | |
4189 | ||
4190 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4191 | return stream; | |
4192 | } | |
4193 | ||
4194 | /*-------------------------------------------------------------------------*/ | |
4195 | ||
4196 | /* fotg210_iso_sched ops can be ITD-only or SITD-only */ | |
4197 | ||
4198 | static struct fotg210_iso_sched * | |
4199 | iso_sched_alloc(unsigned packets, gfp_t mem_flags) | |
4200 | { | |
4201 | struct fotg210_iso_sched *iso_sched; | |
4202 | int size = sizeof(*iso_sched); | |
4203 | ||
4204 | size += packets * sizeof(struct fotg210_iso_packet); | |
4205 | iso_sched = kzalloc(size, mem_flags); | |
4206 | if (likely(iso_sched != NULL)) | |
4207 | INIT_LIST_HEAD(&iso_sched->td_list); | |
4208 | ||
4209 | return iso_sched; | |
4210 | } | |
4211 | ||
4212 | static inline void | |
4213 | itd_sched_init( | |
4214 | struct fotg210_hcd *fotg210, | |
4215 | struct fotg210_iso_sched *iso_sched, | |
4216 | struct fotg210_iso_stream *stream, | |
4217 | struct urb *urb | |
4218 | ) | |
4219 | { | |
4220 | unsigned i; | |
4221 | dma_addr_t dma = urb->transfer_dma; | |
4222 | ||
4223 | /* how many uframes are needed for these transfers */ | |
4224 | iso_sched->span = urb->number_of_packets * stream->interval; | |
4225 | ||
4226 | /* figure out per-uframe itd fields that we'll need later | |
4227 | * when we fit new itds into the schedule. | |
4228 | */ | |
4229 | for (i = 0; i < urb->number_of_packets; i++) { | |
4230 | struct fotg210_iso_packet *uframe = &iso_sched->packet[i]; | |
4231 | unsigned length; | |
4232 | dma_addr_t buf; | |
4233 | u32 trans; | |
4234 | ||
4235 | length = urb->iso_frame_desc[i].length; | |
4236 | buf = dma + urb->iso_frame_desc[i].offset; | |
4237 | ||
4238 | trans = FOTG210_ISOC_ACTIVE; | |
4239 | trans |= buf & 0x0fff; | |
4240 | if (unlikely(((i + 1) == urb->number_of_packets)) | |
4241 | && !(urb->transfer_flags & URB_NO_INTERRUPT)) | |
4242 | trans |= FOTG210_ITD_IOC; | |
4243 | trans |= length << 16; | |
4244 | uframe->transaction = cpu_to_hc32(fotg210, trans); | |
4245 | ||
4246 | /* might need to cross a buffer page within a uframe */ | |
4247 | uframe->bufp = (buf & ~(u64)0x0fff); | |
4248 | buf += length; | |
4249 | if (unlikely((uframe->bufp != (buf & ~(u64)0x0fff)))) | |
4250 | uframe->cross = 1; | |
4251 | } | |
4252 | } | |
4253 | ||
4254 | static void | |
4255 | iso_sched_free( | |
4256 | struct fotg210_iso_stream *stream, | |
4257 | struct fotg210_iso_sched *iso_sched | |
4258 | ) | |
4259 | { | |
4260 | if (!iso_sched) | |
4261 | return; | |
4262 | /* caller must hold fotg210->lock!*/ | |
4263 | list_splice(&iso_sched->td_list, &stream->free_list); | |
4264 | kfree(iso_sched); | |
4265 | } | |
4266 | ||
4267 | static int | |
4268 | itd_urb_transaction( | |
4269 | struct fotg210_iso_stream *stream, | |
4270 | struct fotg210_hcd *fotg210, | |
4271 | struct urb *urb, | |
4272 | gfp_t mem_flags | |
4273 | ) | |
4274 | { | |
4275 | struct fotg210_itd *itd; | |
4276 | dma_addr_t itd_dma; | |
4277 | int i; | |
4278 | unsigned num_itds; | |
4279 | struct fotg210_iso_sched *sched; | |
4280 | unsigned long flags; | |
4281 | ||
4282 | sched = iso_sched_alloc(urb->number_of_packets, mem_flags); | |
4283 | if (unlikely(sched == NULL)) | |
4284 | return -ENOMEM; | |
4285 | ||
4286 | itd_sched_init(fotg210, sched, stream, urb); | |
4287 | ||
4288 | if (urb->interval < 8) | |
4289 | num_itds = 1 + (sched->span + 7) / 8; | |
4290 | else | |
4291 | num_itds = urb->number_of_packets; | |
4292 | ||
4293 | /* allocate/init ITDs */ | |
4294 | spin_lock_irqsave(&fotg210->lock, flags); | |
4295 | for (i = 0; i < num_itds; i++) { | |
4296 | ||
4297 | /* | |
4298 | * Use iTDs from the free list, but not iTDs that may | |
4299 | * still be in use by the hardware. | |
4300 | */ | |
4301 | if (likely(!list_empty(&stream->free_list))) { | |
4302 | itd = list_first_entry(&stream->free_list, | |
4303 | struct fotg210_itd, itd_list); | |
4304 | if (itd->frame == fotg210->now_frame) | |
4305 | goto alloc_itd; | |
4306 | list_del(&itd->itd_list); | |
4307 | itd_dma = itd->itd_dma; | |
4308 | } else { | |
4309 | alloc_itd: | |
4310 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4311 | itd = dma_pool_alloc(fotg210->itd_pool, mem_flags, | |
4312 | &itd_dma); | |
4313 | spin_lock_irqsave(&fotg210->lock, flags); | |
4314 | if (!itd) { | |
4315 | iso_sched_free(stream, sched); | |
4316 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4317 | return -ENOMEM; | |
4318 | } | |
4319 | } | |
4320 | ||
4321 | memset(itd, 0, sizeof(*itd)); | |
4322 | itd->itd_dma = itd_dma; | |
4323 | list_add(&itd->itd_list, &sched->td_list); | |
4324 | } | |
4325 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4326 | ||
4327 | /* temporarily store schedule info in hcpriv */ | |
4328 | urb->hcpriv = sched; | |
4329 | urb->error_count = 0; | |
4330 | return 0; | |
4331 | } | |
4332 | ||
4333 | /*-------------------------------------------------------------------------*/ | |
4334 | ||
4335 | static inline int | |
4336 | itd_slot_ok( | |
4337 | struct fotg210_hcd *fotg210, | |
4338 | u32 mod, | |
4339 | u32 uframe, | |
4340 | u8 usecs, | |
4341 | u32 period | |
4342 | ) | |
4343 | { | |
4344 | uframe %= period; | |
4345 | do { | |
4346 | /* can't commit more than uframe_periodic_max usec */ | |
4347 | if (periodic_usecs(fotg210, uframe >> 3, uframe & 0x7) | |
4348 | > (fotg210->uframe_periodic_max - usecs)) | |
4349 | return 0; | |
4350 | ||
4351 | /* we know urb->interval is 2^N uframes */ | |
4352 | uframe += period; | |
4353 | } while (uframe < mod); | |
4354 | return 1; | |
4355 | } | |
4356 | ||
4357 | /* | |
4358 | * This scheduler plans almost as far into the future as it has actual | |
4359 | * periodic schedule slots. (Affected by TUNE_FLS, which defaults to | |
4360 | * "as small as possible" to be cache-friendlier.) That limits the size | |
4361 | * transfers you can stream reliably; avoid more than 64 msec per urb. | |
4362 | * Also avoid queue depths of less than fotg210's worst irq latency (affected | |
4363 | * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter, | |
4364 | * and other factors); or more than about 230 msec total (for portability, | |
4365 | * given FOTG210_TUNE_FLS and the slop). Or, write a smarter scheduler! | |
4366 | */ | |
4367 | ||
4368 | #define SCHEDULE_SLOP 80 /* microframes */ | |
4369 | ||
4370 | static int | |
4371 | iso_stream_schedule( | |
4372 | struct fotg210_hcd *fotg210, | |
4373 | struct urb *urb, | |
4374 | struct fotg210_iso_stream *stream | |
4375 | ) | |
4376 | { | |
4377 | u32 now, next, start, period, span; | |
4378 | int status; | |
4379 | unsigned mod = fotg210->periodic_size << 3; | |
4380 | struct fotg210_iso_sched *sched = urb->hcpriv; | |
4381 | ||
4382 | period = urb->interval; | |
4383 | span = sched->span; | |
4384 | ||
4385 | if (span > mod - SCHEDULE_SLOP) { | |
4386 | fotg210_dbg(fotg210, "iso request %p too long\n", urb); | |
4387 | status = -EFBIG; | |
4388 | goto fail; | |
4389 | } | |
4390 | ||
4391 | now = fotg210_read_frame_index(fotg210) & (mod - 1); | |
4392 | ||
4393 | /* Typical case: reuse current schedule, stream is still active. | |
4394 | * Hopefully there are no gaps from the host falling behind | |
4395 | * (irq delays etc), but if there are we'll take the next | |
4396 | * slot in the schedule, implicitly assuming URB_ISO_ASAP. | |
4397 | */ | |
4398 | if (likely(!list_empty(&stream->td_list))) { | |
4399 | u32 excess; | |
4400 | ||
4401 | /* For high speed devices, allow scheduling within the | |
4402 | * isochronous scheduling threshold. For full speed devices | |
4403 | * and Intel PCI-based controllers, don't (work around for | |
4404 | * Intel ICH9 bug). | |
4405 | */ | |
4406 | if (!stream->highspeed && fotg210->fs_i_thresh) | |
4407 | next = now + fotg210->i_thresh; | |
4408 | else | |
4409 | next = now; | |
4410 | ||
4411 | /* Fell behind (by up to twice the slop amount)? | |
4412 | * We decide based on the time of the last currently-scheduled | |
4413 | * slot, not the time of the next available slot. | |
4414 | */ | |
4415 | excess = (stream->next_uframe - period - next) & (mod - 1); | |
4416 | if (excess >= mod - 2 * SCHEDULE_SLOP) | |
4417 | start = next + excess - mod + period * | |
4418 | DIV_ROUND_UP(mod - excess, period); | |
4419 | else | |
4420 | start = next + excess + period; | |
4421 | if (start - now >= mod) { | |
4422 | fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n", | |
4423 | urb, start - now - period, period, | |
4424 | mod); | |
4425 | status = -EFBIG; | |
4426 | goto fail; | |
4427 | } | |
4428 | } | |
4429 | ||
4430 | /* need to schedule; when's the next (u)frame we could start? | |
4431 | * this is bigger than fotg210->i_thresh allows; scheduling itself | |
4432 | * isn't free, the slop should handle reasonably slow cpus. it | |
4433 | * can also help high bandwidth if the dma and irq loads don't | |
4434 | * jump until after the queue is primed. | |
4435 | */ | |
4436 | else { | |
4437 | int done = 0; | |
4438 | start = SCHEDULE_SLOP + (now & ~0x07); | |
4439 | ||
4440 | /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */ | |
4441 | ||
4442 | /* find a uframe slot with enough bandwidth. | |
4443 | * Early uframes are more precious because full-speed | |
4444 | * iso IN transfers can't use late uframes, | |
4445 | * and therefore they should be allocated last. | |
4446 | */ | |
4447 | next = start; | |
4448 | start += period; | |
4449 | do { | |
4450 | start--; | |
4451 | /* check schedule: enough space? */ | |
4452 | if (itd_slot_ok(fotg210, mod, start, | |
4453 | stream->usecs, period)) | |
4454 | done = 1; | |
4455 | } while (start > next && !done); | |
4456 | ||
4457 | /* no room in the schedule */ | |
4458 | if (!done) { | |
4459 | fotg210_dbg(fotg210, "iso resched full %p (now %d max %d)\n", | |
4460 | urb, now, now + mod); | |
4461 | status = -ENOSPC; | |
4462 | goto fail; | |
4463 | } | |
4464 | } | |
4465 | ||
4466 | /* Tried to schedule too far into the future? */ | |
4467 | if (unlikely(start - now + span - period | |
4468 | >= mod - 2 * SCHEDULE_SLOP)) { | |
4469 | fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n", | |
4470 | urb, start - now, span - period, | |
4471 | mod - 2 * SCHEDULE_SLOP); | |
4472 | status = -EFBIG; | |
4473 | goto fail; | |
4474 | } | |
4475 | ||
4476 | stream->next_uframe = start & (mod - 1); | |
4477 | ||
4478 | /* report high speed start in uframes; full speed, in frames */ | |
4479 | urb->start_frame = stream->next_uframe; | |
4480 | if (!stream->highspeed) | |
4481 | urb->start_frame >>= 3; | |
4482 | ||
4483 | /* Make sure scan_isoc() sees these */ | |
4484 | if (fotg210->isoc_count == 0) | |
4485 | fotg210->next_frame = now >> 3; | |
4486 | return 0; | |
4487 | ||
4488 | fail: | |
4489 | iso_sched_free(stream, sched); | |
4490 | urb->hcpriv = NULL; | |
4491 | return status; | |
4492 | } | |
4493 | ||
4494 | /*-------------------------------------------------------------------------*/ | |
4495 | ||
4496 | static inline void | |
4497 | itd_init(struct fotg210_hcd *fotg210, struct fotg210_iso_stream *stream, | |
4498 | struct fotg210_itd *itd) | |
4499 | { | |
4500 | int i; | |
4501 | ||
4502 | /* it's been recently zeroed */ | |
4503 | itd->hw_next = FOTG210_LIST_END(fotg210); | |
4504 | itd->hw_bufp[0] = stream->buf0; | |
4505 | itd->hw_bufp[1] = stream->buf1; | |
4506 | itd->hw_bufp[2] = stream->buf2; | |
4507 | ||
4508 | for (i = 0; i < 8; i++) | |
4509 | itd->index[i] = -1; | |
4510 | ||
4511 | /* All other fields are filled when scheduling */ | |
4512 | } | |
4513 | ||
4514 | static inline void | |
4515 | itd_patch( | |
4516 | struct fotg210_hcd *fotg210, | |
4517 | struct fotg210_itd *itd, | |
4518 | struct fotg210_iso_sched *iso_sched, | |
4519 | unsigned index, | |
4520 | u16 uframe | |
4521 | ) | |
4522 | { | |
4523 | struct fotg210_iso_packet *uf = &iso_sched->packet[index]; | |
4524 | unsigned pg = itd->pg; | |
4525 | ||
4526 | uframe &= 0x07; | |
4527 | itd->index[uframe] = index; | |
4528 | ||
4529 | itd->hw_transaction[uframe] = uf->transaction; | |
4530 | itd->hw_transaction[uframe] |= cpu_to_hc32(fotg210, pg << 12); | |
4531 | itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, uf->bufp & ~(u32)0); | |
4532 | itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(uf->bufp >> 32)); | |
4533 | ||
4534 | /* iso_frame_desc[].offset must be strictly increasing */ | |
4535 | if (unlikely(uf->cross)) { | |
4536 | u64 bufp = uf->bufp + 4096; | |
4537 | ||
4538 | itd->pg = ++pg; | |
4539 | itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, bufp & ~(u32)0); | |
4540 | itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(bufp >> 32)); | |
4541 | } | |
4542 | } | |
4543 | ||
4544 | static inline void | |
4545 | itd_link(struct fotg210_hcd *fotg210, unsigned frame, struct fotg210_itd *itd) | |
4546 | { | |
4547 | union fotg210_shadow *prev = &fotg210->pshadow[frame]; | |
4548 | __hc32 *hw_p = &fotg210->periodic[frame]; | |
4549 | union fotg210_shadow here = *prev; | |
4550 | __hc32 type = 0; | |
4551 | ||
4552 | /* skip any iso nodes which might belong to previous microframes */ | |
4553 | while (here.ptr) { | |
4554 | type = Q_NEXT_TYPE(fotg210, *hw_p); | |
4555 | if (type == cpu_to_hc32(fotg210, Q_TYPE_QH)) | |
4556 | break; | |
4557 | prev = periodic_next_shadow(fotg210, prev, type); | |
4558 | hw_p = shadow_next_periodic(fotg210, &here, type); | |
4559 | here = *prev; | |
4560 | } | |
4561 | ||
4562 | itd->itd_next = here; | |
4563 | itd->hw_next = *hw_p; | |
4564 | prev->itd = itd; | |
4565 | itd->frame = frame; | |
4566 | wmb(); | |
4567 | *hw_p = cpu_to_hc32(fotg210, itd->itd_dma | Q_TYPE_ITD); | |
4568 | } | |
4569 | ||
4570 | /* fit urb's itds into the selected schedule slot; activate as needed */ | |
4571 | static void itd_link_urb( | |
4572 | struct fotg210_hcd *fotg210, | |
4573 | struct urb *urb, | |
4574 | unsigned mod, | |
4575 | struct fotg210_iso_stream *stream | |
4576 | ) | |
4577 | { | |
4578 | int packet; | |
4579 | unsigned next_uframe, uframe, frame; | |
4580 | struct fotg210_iso_sched *iso_sched = urb->hcpriv; | |
4581 | struct fotg210_itd *itd; | |
4582 | ||
4583 | next_uframe = stream->next_uframe & (mod - 1); | |
4584 | ||
4585 | if (unlikely(list_empty(&stream->td_list))) { | |
4586 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated | |
4587 | += stream->bandwidth; | |
be5ac4c4 | 4588 | fotg210_dbg(fotg210, |
7d50195f FHC |
4589 | "schedule devp %s ep%d%s-iso period %d start %d.%d\n", |
4590 | urb->dev->devpath, stream->bEndpointAddress & 0x0f, | |
4591 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out", | |
4592 | urb->interval, | |
4593 | next_uframe >> 3, next_uframe & 0x7); | |
4594 | } | |
4595 | ||
4596 | /* fill iTDs uframe by uframe */ | |
4597 | for (packet = 0, itd = NULL; packet < urb->number_of_packets;) { | |
4598 | if (itd == NULL) { | |
4599 | /* ASSERT: we have all necessary itds */ | |
4600 | ||
4601 | /* ASSERT: no itds for this endpoint in this uframe */ | |
4602 | ||
4603 | itd = list_entry(iso_sched->td_list.next, | |
4604 | struct fotg210_itd, itd_list); | |
4605 | list_move_tail(&itd->itd_list, &stream->td_list); | |
4606 | itd->stream = stream; | |
4607 | itd->urb = urb; | |
4608 | itd_init(fotg210, stream, itd); | |
4609 | } | |
4610 | ||
4611 | uframe = next_uframe & 0x07; | |
4612 | frame = next_uframe >> 3; | |
4613 | ||
4614 | itd_patch(fotg210, itd, iso_sched, packet, uframe); | |
4615 | ||
4616 | next_uframe += stream->interval; | |
4617 | next_uframe &= mod - 1; | |
4618 | packet++; | |
4619 | ||
4620 | /* link completed itds into the schedule */ | |
4621 | if (((next_uframe >> 3) != frame) | |
4622 | || packet == urb->number_of_packets) { | |
4623 | itd_link(fotg210, frame & (fotg210->periodic_size - 1), | |
4624 | itd); | |
4625 | itd = NULL; | |
4626 | } | |
4627 | } | |
4628 | stream->next_uframe = next_uframe; | |
4629 | ||
4630 | /* don't need that schedule data any more */ | |
4631 | iso_sched_free(stream, iso_sched); | |
4632 | urb->hcpriv = NULL; | |
4633 | ||
4634 | ++fotg210->isoc_count; | |
4635 | enable_periodic(fotg210); | |
4636 | } | |
4637 | ||
4638 | #define ISO_ERRS (FOTG210_ISOC_BUF_ERR | FOTG210_ISOC_BABBLE |\ | |
4639 | FOTG210_ISOC_XACTERR) | |
4640 | ||
4641 | /* Process and recycle a completed ITD. Return true iff its urb completed, | |
4642 | * and hence its completion callback probably added things to the hardware | |
4643 | * schedule. | |
4644 | * | |
4645 | * Note that we carefully avoid recycling this descriptor until after any | |
4646 | * completion callback runs, so that it won't be reused quickly. That is, | |
4647 | * assuming (a) no more than two urbs per frame on this endpoint, and also | |
4648 | * (b) only this endpoint's completions submit URBs. It seems some silicon | |
4649 | * corrupts things if you reuse completed descriptors very quickly... | |
4650 | */ | |
4651 | static bool itd_complete(struct fotg210_hcd *fotg210, struct fotg210_itd *itd) | |
4652 | { | |
4653 | struct urb *urb = itd->urb; | |
4654 | struct usb_iso_packet_descriptor *desc; | |
4655 | u32 t; | |
4656 | unsigned uframe; | |
4657 | int urb_index = -1; | |
4658 | struct fotg210_iso_stream *stream = itd->stream; | |
4659 | struct usb_device *dev; | |
4660 | bool retval = false; | |
4661 | ||
4662 | /* for each uframe with a packet */ | |
4663 | for (uframe = 0; uframe < 8; uframe++) { | |
4664 | if (likely(itd->index[uframe] == -1)) | |
4665 | continue; | |
4666 | urb_index = itd->index[uframe]; | |
4667 | desc = &urb->iso_frame_desc[urb_index]; | |
4668 | ||
4669 | t = hc32_to_cpup(fotg210, &itd->hw_transaction[uframe]); | |
4670 | itd->hw_transaction[uframe] = 0; | |
4671 | ||
4672 | /* report transfer status */ | |
4673 | if (unlikely(t & ISO_ERRS)) { | |
4674 | urb->error_count++; | |
4675 | if (t & FOTG210_ISOC_BUF_ERR) | |
4676 | desc->status = usb_pipein(urb->pipe) | |
4677 | ? -ENOSR /* hc couldn't read */ | |
4678 | : -ECOMM; /* hc couldn't write */ | |
4679 | else if (t & FOTG210_ISOC_BABBLE) | |
4680 | desc->status = -EOVERFLOW; | |
4681 | else /* (t & FOTG210_ISOC_XACTERR) */ | |
4682 | desc->status = -EPROTO; | |
4683 | ||
4684 | /* HC need not update length with this error */ | |
4685 | if (!(t & FOTG210_ISOC_BABBLE)) { | |
4686 | desc->actual_length = | |
4687 | fotg210_itdlen(urb, desc, t); | |
4688 | urb->actual_length += desc->actual_length; | |
4689 | } | |
4690 | } else if (likely((t & FOTG210_ISOC_ACTIVE) == 0)) { | |
4691 | desc->status = 0; | |
4692 | desc->actual_length = fotg210_itdlen(urb, desc, t); | |
4693 | urb->actual_length += desc->actual_length; | |
4694 | } else { | |
4695 | /* URB was too late */ | |
4696 | desc->status = -EXDEV; | |
4697 | } | |
4698 | } | |
4699 | ||
4700 | /* handle completion now? */ | |
4701 | if (likely((urb_index + 1) != urb->number_of_packets)) | |
4702 | goto done; | |
4703 | ||
4704 | /* ASSERT: it's really the last itd for this urb | |
4705 | list_for_each_entry (itd, &stream->td_list, itd_list) | |
4706 | BUG_ON (itd->urb == urb); | |
4707 | */ | |
4708 | ||
4709 | /* give urb back to the driver; completion often (re)submits */ | |
4710 | dev = urb->dev; | |
4711 | fotg210_urb_done(fotg210, urb, 0); | |
4712 | retval = true; | |
4713 | urb = NULL; | |
4714 | ||
4715 | --fotg210->isoc_count; | |
4716 | disable_periodic(fotg210); | |
4717 | ||
4718 | if (unlikely(list_is_singular(&stream->td_list))) { | |
4719 | fotg210_to_hcd(fotg210)->self.bandwidth_allocated | |
4720 | -= stream->bandwidth; | |
be5ac4c4 | 4721 | fotg210_dbg(fotg210, |
7d50195f FHC |
4722 | "deschedule devp %s ep%d%s-iso\n", |
4723 | dev->devpath, stream->bEndpointAddress & 0x0f, | |
4724 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out"); | |
4725 | } | |
4726 | ||
4727 | done: | |
4728 | itd->urb = NULL; | |
4729 | ||
4730 | /* Add to the end of the free list for later reuse */ | |
4731 | list_move_tail(&itd->itd_list, &stream->free_list); | |
4732 | ||
4733 | /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */ | |
4734 | if (list_empty(&stream->td_list)) { | |
4735 | list_splice_tail_init(&stream->free_list, | |
4736 | &fotg210->cached_itd_list); | |
4737 | start_free_itds(fotg210); | |
4738 | } | |
4739 | ||
4740 | return retval; | |
4741 | } | |
4742 | ||
4743 | /*-------------------------------------------------------------------------*/ | |
4744 | ||
4745 | static int itd_submit(struct fotg210_hcd *fotg210, struct urb *urb, | |
4746 | gfp_t mem_flags) | |
4747 | { | |
4748 | int status = -EINVAL; | |
4749 | unsigned long flags; | |
4750 | struct fotg210_iso_stream *stream; | |
4751 | ||
4752 | /* Get iso_stream head */ | |
4753 | stream = iso_stream_find(fotg210, urb); | |
4754 | if (unlikely(stream == NULL)) { | |
4755 | fotg210_dbg(fotg210, "can't get iso stream\n"); | |
4756 | return -ENOMEM; | |
4757 | } | |
4758 | if (unlikely(urb->interval != stream->interval && | |
4759 | fotg210_port_speed(fotg210, 0) == | |
4760 | USB_PORT_STAT_HIGH_SPEED)) { | |
4761 | fotg210_dbg(fotg210, "can't change iso interval %d --> %d\n", | |
4762 | stream->interval, urb->interval); | |
4763 | goto done; | |
4764 | } | |
4765 | ||
4766 | #ifdef FOTG210_URB_TRACE | |
4767 | fotg210_dbg(fotg210, | |
4768 | "%s %s urb %p ep%d%s len %d, %d pkts %d uframes[%p]\n", | |
4769 | __func__, urb->dev->devpath, urb, | |
4770 | usb_pipeendpoint(urb->pipe), | |
4771 | usb_pipein(urb->pipe) ? "in" : "out", | |
4772 | urb->transfer_buffer_length, | |
4773 | urb->number_of_packets, urb->interval, | |
4774 | stream); | |
4775 | #endif | |
4776 | ||
4777 | /* allocate ITDs w/o locking anything */ | |
4778 | status = itd_urb_transaction(stream, fotg210, urb, mem_flags); | |
4779 | if (unlikely(status < 0)) { | |
4780 | fotg210_dbg(fotg210, "can't init itds\n"); | |
4781 | goto done; | |
4782 | } | |
4783 | ||
4784 | /* schedule ... need to lock */ | |
4785 | spin_lock_irqsave(&fotg210->lock, flags); | |
4786 | if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { | |
4787 | status = -ESHUTDOWN; | |
4788 | goto done_not_linked; | |
4789 | } | |
4790 | status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); | |
4791 | if (unlikely(status)) | |
4792 | goto done_not_linked; | |
4793 | status = iso_stream_schedule(fotg210, urb, stream); | |
4794 | if (likely(status == 0)) | |
4795 | itd_link_urb(fotg210, urb, fotg210->periodic_size << 3, stream); | |
4796 | else | |
4797 | usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); | |
4798 | done_not_linked: | |
4799 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4800 | done: | |
4801 | return status; | |
4802 | } | |
4803 | ||
4804 | /*-------------------------------------------------------------------------*/ | |
4805 | ||
4806 | static void scan_isoc(struct fotg210_hcd *fotg210) | |
4807 | { | |
4808 | unsigned uf, now_frame, frame; | |
4809 | unsigned fmask = fotg210->periodic_size - 1; | |
4810 | bool modified, live; | |
4811 | ||
4812 | /* | |
4813 | * When running, scan from last scan point up to "now" | |
4814 | * else clean up by scanning everything that's left. | |
4815 | * Touches as few pages as possible: cache-friendly. | |
4816 | */ | |
4817 | if (fotg210->rh_state >= FOTG210_RH_RUNNING) { | |
4818 | uf = fotg210_read_frame_index(fotg210); | |
4819 | now_frame = (uf >> 3) & fmask; | |
4820 | live = true; | |
4821 | } else { | |
4822 | now_frame = (fotg210->next_frame - 1) & fmask; | |
4823 | live = false; | |
4824 | } | |
4825 | fotg210->now_frame = now_frame; | |
4826 | ||
4827 | frame = fotg210->next_frame; | |
4828 | for (;;) { | |
4829 | union fotg210_shadow q, *q_p; | |
4830 | __hc32 type, *hw_p; | |
4831 | ||
4832 | restart: | |
4833 | /* scan each element in frame's queue for completions */ | |
4834 | q_p = &fotg210->pshadow[frame]; | |
4835 | hw_p = &fotg210->periodic[frame]; | |
4836 | q.ptr = q_p->ptr; | |
4837 | type = Q_NEXT_TYPE(fotg210, *hw_p); | |
4838 | modified = false; | |
4839 | ||
4840 | while (q.ptr != NULL) { | |
4841 | switch (hc32_to_cpu(fotg210, type)) { | |
4842 | case Q_TYPE_ITD: | |
4843 | /* If this ITD is still active, leave it for | |
4844 | * later processing ... check the next entry. | |
4845 | * No need to check for activity unless the | |
4846 | * frame is current. | |
4847 | */ | |
4848 | if (frame == now_frame && live) { | |
4849 | rmb(); | |
4850 | for (uf = 0; uf < 8; uf++) { | |
4851 | if (q.itd->hw_transaction[uf] & | |
4852 | ITD_ACTIVE(fotg210)) | |
4853 | break; | |
4854 | } | |
4855 | if (uf < 8) { | |
4856 | q_p = &q.itd->itd_next; | |
4857 | hw_p = &q.itd->hw_next; | |
4858 | type = Q_NEXT_TYPE(fotg210, | |
4859 | q.itd->hw_next); | |
4860 | q = *q_p; | |
4861 | break; | |
4862 | } | |
4863 | } | |
4864 | ||
4865 | /* Take finished ITDs out of the schedule | |
4866 | * and process them: recycle, maybe report | |
4867 | * URB completion. HC won't cache the | |
4868 | * pointer for much longer, if at all. | |
4869 | */ | |
4870 | *q_p = q.itd->itd_next; | |
4871 | *hw_p = q.itd->hw_next; | |
4872 | type = Q_NEXT_TYPE(fotg210, q.itd->hw_next); | |
4873 | wmb(); | |
4874 | modified = itd_complete(fotg210, q.itd); | |
4875 | q = *q_p; | |
4876 | break; | |
4877 | default: | |
4878 | fotg210_dbg(fotg210, "corrupt type %d frame %d shadow %p\n", | |
4879 | type, frame, q.ptr); | |
4880 | /* FALL THROUGH */ | |
4881 | case Q_TYPE_QH: | |
4882 | case Q_TYPE_FSTN: | |
4883 | /* End of the iTDs and siTDs */ | |
4884 | q.ptr = NULL; | |
4885 | break; | |
4886 | } | |
4887 | ||
4888 | /* assume completion callbacks modify the queue */ | |
4889 | if (unlikely(modified && fotg210->isoc_count > 0)) | |
4890 | goto restart; | |
4891 | } | |
4892 | ||
4893 | /* Stop when we have reached the current frame */ | |
4894 | if (frame == now_frame) | |
4895 | break; | |
4896 | frame = (frame + 1) & fmask; | |
4897 | } | |
4898 | fotg210->next_frame = now_frame; | |
4899 | } | |
4900 | /*-------------------------------------------------------------------------*/ | |
4901 | /* | |
4902 | * Display / Set uframe_periodic_max | |
4903 | */ | |
4904 | static ssize_t show_uframe_periodic_max(struct device *dev, | |
4905 | struct device_attribute *attr, | |
4906 | char *buf) | |
4907 | { | |
4908 | struct fotg210_hcd *fotg210; | |
4909 | int n; | |
4910 | ||
4911 | fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev))); | |
4912 | n = scnprintf(buf, PAGE_SIZE, "%d\n", fotg210->uframe_periodic_max); | |
4913 | return n; | |
4914 | } | |
4915 | ||
4916 | ||
4917 | static ssize_t store_uframe_periodic_max(struct device *dev, | |
4918 | struct device_attribute *attr, | |
4919 | const char *buf, size_t count) | |
4920 | { | |
4921 | struct fotg210_hcd *fotg210; | |
4922 | unsigned uframe_periodic_max; | |
4923 | unsigned frame, uframe; | |
4924 | unsigned short allocated_max; | |
4925 | unsigned long flags; | |
4926 | ssize_t ret; | |
4927 | ||
4928 | fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev))); | |
4929 | if (kstrtouint(buf, 0, &uframe_periodic_max) < 0) | |
4930 | return -EINVAL; | |
4931 | ||
4932 | if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) { | |
4933 | fotg210_info(fotg210, "rejecting invalid request for uframe_periodic_max=%u\n", | |
4934 | uframe_periodic_max); | |
4935 | return -EINVAL; | |
4936 | } | |
4937 | ||
4938 | ret = -EINVAL; | |
4939 | ||
4940 | /* | |
4941 | * lock, so that our checking does not race with possible periodic | |
4942 | * bandwidth allocation through submitting new urbs. | |
4943 | */ | |
4944 | spin_lock_irqsave(&fotg210->lock, flags); | |
4945 | ||
4946 | /* | |
4947 | * for request to decrease max periodic bandwidth, we have to check | |
4948 | * every microframe in the schedule to see whether the decrease is | |
4949 | * possible. | |
4950 | */ | |
4951 | if (uframe_periodic_max < fotg210->uframe_periodic_max) { | |
4952 | allocated_max = 0; | |
4953 | ||
4954 | for (frame = 0; frame < fotg210->periodic_size; ++frame) | |
4955 | for (uframe = 0; uframe < 7; ++uframe) | |
4956 | allocated_max = max(allocated_max, | |
4957 | periodic_usecs(fotg210, frame, uframe)); | |
4958 | ||
4959 | if (allocated_max > uframe_periodic_max) { | |
4960 | fotg210_info(fotg210, | |
4961 | "cannot decrease uframe_periodic_max becase " | |
4962 | "periodic bandwidth is already allocated " | |
4963 | "(%u > %u)\n", | |
4964 | allocated_max, uframe_periodic_max); | |
4965 | goto out_unlock; | |
4966 | } | |
4967 | } | |
4968 | ||
4969 | /* increasing is always ok */ | |
4970 | ||
4971 | fotg210_info(fotg210, "setting max periodic bandwidth to %u%% (== %u usec/uframe)\n", | |
4972 | 100 * uframe_periodic_max/125, uframe_periodic_max); | |
4973 | ||
4974 | if (uframe_periodic_max != 100) | |
4975 | fotg210_warn(fotg210, "max periodic bandwidth set is non-standard\n"); | |
4976 | ||
4977 | fotg210->uframe_periodic_max = uframe_periodic_max; | |
4978 | ret = count; | |
4979 | ||
4980 | out_unlock: | |
4981 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
4982 | return ret; | |
4983 | } | |
4984 | ||
4985 | static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, | |
4986 | store_uframe_periodic_max); | |
4987 | ||
4988 | static inline int create_sysfs_files(struct fotg210_hcd *fotg210) | |
4989 | { | |
4990 | struct device *controller = fotg210_to_hcd(fotg210)->self.controller; | |
4991 | int i = 0; | |
4992 | ||
4993 | if (i) | |
4994 | goto out; | |
4995 | ||
4996 | i = device_create_file(controller, &dev_attr_uframe_periodic_max); | |
4997 | out: | |
4998 | return i; | |
4999 | } | |
5000 | ||
5001 | static inline void remove_sysfs_files(struct fotg210_hcd *fotg210) | |
5002 | { | |
5003 | struct device *controller = fotg210_to_hcd(fotg210)->self.controller; | |
5004 | ||
5005 | device_remove_file(controller, &dev_attr_uframe_periodic_max); | |
5006 | } | |
5007 | /*-------------------------------------------------------------------------*/ | |
5008 | ||
5009 | /* On some systems, leaving remote wakeup enabled prevents system shutdown. | |
5010 | * The firmware seems to think that powering off is a wakeup event! | |
5011 | * This routine turns off remote wakeup and everything else, on all ports. | |
5012 | */ | |
5013 | static void fotg210_turn_off_all_ports(struct fotg210_hcd *fotg210) | |
5014 | { | |
5015 | u32 __iomem *status_reg = &fotg210->regs->port_status; | |
5016 | ||
5017 | fotg210_writel(fotg210, PORT_RWC_BITS, status_reg); | |
5018 | } | |
5019 | ||
5020 | /* | |
5021 | * Halt HC, turn off all ports, and let the BIOS use the companion controllers. | |
5022 | * Must be called with interrupts enabled and the lock not held. | |
5023 | */ | |
5024 | static void fotg210_silence_controller(struct fotg210_hcd *fotg210) | |
5025 | { | |
5026 | fotg210_halt(fotg210); | |
5027 | ||
5028 | spin_lock_irq(&fotg210->lock); | |
5029 | fotg210->rh_state = FOTG210_RH_HALTED; | |
5030 | fotg210_turn_off_all_ports(fotg210); | |
5031 | spin_unlock_irq(&fotg210->lock); | |
5032 | } | |
5033 | ||
5034 | /* fotg210_shutdown kick in for silicon on any bus (not just pci, etc). | |
5035 | * This forcibly disables dma and IRQs, helping kexec and other cases | |
5036 | * where the next system software may expect clean state. | |
5037 | */ | |
5038 | static void fotg210_shutdown(struct usb_hcd *hcd) | |
5039 | { | |
5040 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5041 | ||
5042 | spin_lock_irq(&fotg210->lock); | |
5043 | fotg210->shutdown = true; | |
5044 | fotg210->rh_state = FOTG210_RH_STOPPING; | |
5045 | fotg210->enabled_hrtimer_events = 0; | |
5046 | spin_unlock_irq(&fotg210->lock); | |
5047 | ||
5048 | fotg210_silence_controller(fotg210); | |
5049 | ||
5050 | hrtimer_cancel(&fotg210->hrtimer); | |
5051 | } | |
5052 | ||
5053 | /*-------------------------------------------------------------------------*/ | |
5054 | ||
5055 | /* | |
5056 | * fotg210_work is called from some interrupts, timers, and so on. | |
5057 | * it calls driver completion functions, after dropping fotg210->lock. | |
5058 | */ | |
5059 | static void fotg210_work(struct fotg210_hcd *fotg210) | |
5060 | { | |
5061 | /* another CPU may drop fotg210->lock during a schedule scan while | |
5062 | * it reports urb completions. this flag guards against bogus | |
5063 | * attempts at re-entrant schedule scanning. | |
5064 | */ | |
5065 | if (fotg210->scanning) { | |
5066 | fotg210->need_rescan = true; | |
5067 | return; | |
5068 | } | |
5069 | fotg210->scanning = true; | |
5070 | ||
5071 | rescan: | |
5072 | fotg210->need_rescan = false; | |
5073 | if (fotg210->async_count) | |
5074 | scan_async(fotg210); | |
5075 | if (fotg210->intr_count > 0) | |
5076 | scan_intr(fotg210); | |
5077 | if (fotg210->isoc_count > 0) | |
5078 | scan_isoc(fotg210); | |
5079 | if (fotg210->need_rescan) | |
5080 | goto rescan; | |
5081 | fotg210->scanning = false; | |
5082 | ||
5083 | /* the IO watchdog guards against hardware or driver bugs that | |
5084 | * misplace IRQs, and should let us run completely without IRQs. | |
5085 | * such lossage has been observed on both VT6202 and VT8235. | |
5086 | */ | |
5087 | turn_on_io_watchdog(fotg210); | |
5088 | } | |
5089 | ||
5090 | /* | |
5091 | * Called when the fotg210_hcd module is removed. | |
5092 | */ | |
5093 | static void fotg210_stop(struct usb_hcd *hcd) | |
5094 | { | |
5095 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5096 | ||
5097 | fotg210_dbg(fotg210, "stop\n"); | |
5098 | ||
5099 | /* no more interrupts ... */ | |
5100 | ||
5101 | spin_lock_irq(&fotg210->lock); | |
5102 | fotg210->enabled_hrtimer_events = 0; | |
5103 | spin_unlock_irq(&fotg210->lock); | |
5104 | ||
5105 | fotg210_quiesce(fotg210); | |
5106 | fotg210_silence_controller(fotg210); | |
5107 | fotg210_reset(fotg210); | |
5108 | ||
5109 | hrtimer_cancel(&fotg210->hrtimer); | |
5110 | remove_sysfs_files(fotg210); | |
5111 | remove_debug_files(fotg210); | |
5112 | ||
5113 | /* root hub is shut down separately (first, when possible) */ | |
5114 | spin_lock_irq(&fotg210->lock); | |
5115 | end_free_itds(fotg210); | |
5116 | spin_unlock_irq(&fotg210->lock); | |
5117 | fotg210_mem_cleanup(fotg210); | |
5118 | ||
5119 | #ifdef FOTG210_STATS | |
5120 | fotg210_dbg(fotg210, "irq normal %ld err %ld iaa %ld (lost %ld)\n", | |
5121 | fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa, | |
5122 | fotg210->stats.lost_iaa); | |
5123 | fotg210_dbg(fotg210, "complete %ld unlink %ld\n", | |
5124 | fotg210->stats.complete, fotg210->stats.unlink); | |
5125 | #endif | |
5126 | ||
5127 | dbg_status(fotg210, "fotg210_stop completed", | |
5128 | fotg210_readl(fotg210, &fotg210->regs->status)); | |
5129 | } | |
5130 | ||
5131 | /* one-time init, only for memory state */ | |
5132 | static int hcd_fotg210_init(struct usb_hcd *hcd) | |
5133 | { | |
5134 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5135 | u32 temp; | |
5136 | int retval; | |
5137 | u32 hcc_params; | |
5138 | struct fotg210_qh_hw *hw; | |
5139 | ||
5140 | spin_lock_init(&fotg210->lock); | |
5141 | ||
5142 | /* | |
5143 | * keep io watchdog by default, those good HCDs could turn off it later | |
5144 | */ | |
5145 | fotg210->need_io_watchdog = 1; | |
5146 | ||
5147 | hrtimer_init(&fotg210->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
5148 | fotg210->hrtimer.function = fotg210_hrtimer_func; | |
5149 | fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT; | |
5150 | ||
5151 | hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
5152 | ||
5153 | /* | |
5154 | * by default set standard 80% (== 100 usec/uframe) max periodic | |
5155 | * bandwidth as required by USB 2.0 | |
5156 | */ | |
5157 | fotg210->uframe_periodic_max = 100; | |
5158 | ||
5159 | /* | |
5160 | * hw default: 1K periodic list heads, one per frame. | |
5161 | * periodic_size can shrink by USBCMD update if hcc_params allows. | |
5162 | */ | |
5163 | fotg210->periodic_size = DEFAULT_I_TDPS; | |
5164 | INIT_LIST_HEAD(&fotg210->intr_qh_list); | |
5165 | INIT_LIST_HEAD(&fotg210->cached_itd_list); | |
5166 | ||
5167 | if (HCC_PGM_FRAMELISTLEN(hcc_params)) { | |
5168 | /* periodic schedule size can be smaller than default */ | |
5169 | switch (FOTG210_TUNE_FLS) { | |
5170 | case 0: | |
5171 | fotg210->periodic_size = 1024; | |
5172 | break; | |
5173 | case 1: | |
5174 | fotg210->periodic_size = 512; | |
5175 | break; | |
5176 | case 2: | |
5177 | fotg210->periodic_size = 256; | |
5178 | break; | |
5179 | default: | |
5180 | BUG(); | |
5181 | } | |
5182 | } | |
5183 | retval = fotg210_mem_init(fotg210, GFP_KERNEL); | |
5184 | if (retval < 0) | |
5185 | return retval; | |
5186 | ||
5187 | /* controllers may cache some of the periodic schedule ... */ | |
5188 | fotg210->i_thresh = 2; | |
5189 | ||
5190 | /* | |
5191 | * dedicate a qh for the async ring head, since we couldn't unlink | |
5192 | * a 'real' qh without stopping the async schedule [4.8]. use it | |
5193 | * as the 'reclamation list head' too. | |
5194 | * its dummy is used in hw_alt_next of many tds, to prevent the qh | |
5195 | * from automatically advancing to the next td after short reads. | |
5196 | */ | |
5197 | fotg210->async->qh_next.qh = NULL; | |
5198 | hw = fotg210->async->hw; | |
5199 | hw->hw_next = QH_NEXT(fotg210, fotg210->async->qh_dma); | |
5200 | hw->hw_info1 = cpu_to_hc32(fotg210, QH_HEAD); | |
5201 | hw->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT); | |
5202 | hw->hw_qtd_next = FOTG210_LIST_END(fotg210); | |
5203 | fotg210->async->qh_state = QH_STATE_LINKED; | |
5204 | hw->hw_alt_next = QTD_NEXT(fotg210, fotg210->async->dummy->qtd_dma); | |
5205 | ||
5206 | /* clear interrupt enables, set irq latency */ | |
5207 | if (log2_irq_thresh < 0 || log2_irq_thresh > 6) | |
5208 | log2_irq_thresh = 0; | |
5209 | temp = 1 << (16 + log2_irq_thresh); | |
5210 | if (HCC_CANPARK(hcc_params)) { | |
5211 | /* HW default park == 3, on hardware that supports it (like | |
5212 | * NVidia and ALI silicon), maximizes throughput on the async | |
5213 | * schedule by avoiding QH fetches between transfers. | |
5214 | * | |
5215 | * With fast usb storage devices and NForce2, "park" seems to | |
5216 | * make problems: throughput reduction (!), data errors... | |
5217 | */ | |
5218 | if (park) { | |
5219 | park = min_t(unsigned, park, 3); | |
5220 | temp |= CMD_PARK; | |
5221 | temp |= park << 8; | |
5222 | } | |
5223 | fotg210_dbg(fotg210, "park %d\n", park); | |
5224 | } | |
5225 | if (HCC_PGM_FRAMELISTLEN(hcc_params)) { | |
5226 | /* periodic schedule size can be smaller than default */ | |
5227 | temp &= ~(3 << 2); | |
5228 | temp |= (FOTG210_TUNE_FLS << 2); | |
5229 | } | |
5230 | fotg210->command = temp; | |
5231 | ||
5232 | /* Accept arbitrarily long scatter-gather lists */ | |
5233 | if (!(hcd->driver->flags & HCD_LOCAL_MEM)) | |
5234 | hcd->self.sg_tablesize = ~0; | |
5235 | return 0; | |
5236 | } | |
5237 | ||
5238 | /* start HC running; it's halted, hcd_fotg210_init() has been run (once) */ | |
5239 | static int fotg210_run(struct usb_hcd *hcd) | |
5240 | { | |
5241 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5242 | u32 temp; | |
5243 | u32 hcc_params; | |
5244 | ||
5245 | hcd->uses_new_polling = 1; | |
5246 | ||
5247 | /* EHCI spec section 4.1 */ | |
5248 | ||
5249 | fotg210_writel(fotg210, fotg210->periodic_dma, | |
5250 | &fotg210->regs->frame_list); | |
5251 | fotg210_writel(fotg210, (u32)fotg210->async->qh_dma, | |
5252 | &fotg210->regs->async_next); | |
5253 | ||
5254 | /* | |
5255 | * hcc_params controls whether fotg210->regs->segment must (!!!) | |
5256 | * be used; it constrains QH/ITD/SITD and QTD locations. | |
5257 | * pci_pool consistent memory always uses segment zero. | |
5258 | * streaming mappings for I/O buffers, like pci_map_single(), | |
5259 | * can return segments above 4GB, if the device allows. | |
5260 | * | |
5261 | * NOTE: the dma mask is visible through dma_supported(), so | |
5262 | * drivers can pass this info along ... like NETIF_F_HIGHDMA, | |
5263 | * Scsi_Host.highmem_io, and so forth. It's readonly to all | |
5264 | * host side drivers though. | |
5265 | */ | |
5266 | hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); | |
5267 | ||
5268 | /* | |
5269 | * Philips, Intel, and maybe others need CMD_RUN before the | |
5270 | * root hub will detect new devices (why?); NEC doesn't | |
5271 | */ | |
5272 | fotg210->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET); | |
5273 | fotg210->command |= CMD_RUN; | |
5274 | fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); | |
5275 | dbg_cmd(fotg210, "init", fotg210->command); | |
5276 | ||
5277 | /* | |
5278 | * Start, enabling full USB 2.0 functionality ... usb 1.1 devices | |
5279 | * are explicitly handed to companion controller(s), so no TT is | |
5280 | * involved with the root hub. (Except where one is integrated, | |
5281 | * and there's no companion controller unless maybe for USB OTG.) | |
5282 | * | |
5283 | * Turning on the CF flag will transfer ownership of all ports | |
5284 | * from the companions to the EHCI controller. If any of the | |
5285 | * companions are in the middle of a port reset at the time, it | |
5286 | * could cause trouble. Write-locking ehci_cf_port_reset_rwsem | |
5287 | * guarantees that no resets are in progress. After we set CF, | |
5288 | * a short delay lets the hardware catch up; new resets shouldn't | |
5289 | * be started before the port switching actions could complete. | |
5290 | */ | |
5291 | down_write(&ehci_cf_port_reset_rwsem); | |
5292 | fotg210->rh_state = FOTG210_RH_RUNNING; | |
5293 | /* unblock posted writes */ | |
5294 | fotg210_readl(fotg210, &fotg210->regs->command); | |
5295 | msleep(5); | |
5296 | up_write(&ehci_cf_port_reset_rwsem); | |
5297 | fotg210->last_periodic_enable = ktime_get_real(); | |
5298 | ||
5299 | temp = HC_VERSION(fotg210, | |
5300 | fotg210_readl(fotg210, &fotg210->caps->hc_capbase)); | |
5301 | fotg210_info(fotg210, | |
5302 | "USB %x.%x started, EHCI %x.%02x\n", | |
5303 | ((fotg210->sbrn & 0xf0)>>4), (fotg210->sbrn & 0x0f), | |
5304 | temp >> 8, temp & 0xff); | |
5305 | ||
5306 | fotg210_writel(fotg210, INTR_MASK, | |
5307 | &fotg210->regs->intr_enable); /* Turn On Interrupts */ | |
5308 | ||
5309 | /* GRR this is run-once init(), being done every time the HC starts. | |
5310 | * So long as they're part of class devices, we can't do it init() | |
5311 | * since the class device isn't created that early. | |
5312 | */ | |
5313 | create_debug_files(fotg210); | |
5314 | create_sysfs_files(fotg210); | |
5315 | ||
5316 | return 0; | |
5317 | } | |
5318 | ||
5319 | static int fotg210_setup(struct usb_hcd *hcd) | |
5320 | { | |
5321 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5322 | int retval; | |
5323 | ||
5324 | fotg210->regs = (void __iomem *)fotg210->caps + | |
5325 | HC_LENGTH(fotg210, | |
5326 | fotg210_readl(fotg210, &fotg210->caps->hc_capbase)); | |
5327 | dbg_hcs_params(fotg210, "reset"); | |
5328 | dbg_hcc_params(fotg210, "reset"); | |
5329 | ||
5330 | /* cache this readonly data; minimize chip reads */ | |
5331 | fotg210->hcs_params = fotg210_readl(fotg210, | |
5332 | &fotg210->caps->hcs_params); | |
5333 | ||
5334 | fotg210->sbrn = HCD_USB2; | |
5335 | ||
5336 | /* data structure init */ | |
5337 | retval = hcd_fotg210_init(hcd); | |
5338 | if (retval) | |
5339 | return retval; | |
5340 | ||
5341 | retval = fotg210_halt(fotg210); | |
5342 | if (retval) | |
5343 | return retval; | |
5344 | ||
5345 | fotg210_reset(fotg210); | |
5346 | ||
5347 | return 0; | |
5348 | } | |
5349 | ||
5350 | /*-------------------------------------------------------------------------*/ | |
5351 | ||
5352 | static irqreturn_t fotg210_irq(struct usb_hcd *hcd) | |
5353 | { | |
5354 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5355 | u32 status, masked_status, pcd_status = 0, cmd; | |
5356 | int bh; | |
5357 | ||
5358 | spin_lock(&fotg210->lock); | |
5359 | ||
5360 | status = fotg210_readl(fotg210, &fotg210->regs->status); | |
5361 | ||
5362 | /* e.g. cardbus physical eject */ | |
5363 | if (status == ~(u32) 0) { | |
5364 | fotg210_dbg(fotg210, "device removed\n"); | |
5365 | goto dead; | |
5366 | } | |
5367 | ||
5368 | /* | |
5369 | * We don't use STS_FLR, but some controllers don't like it to | |
5370 | * remain on, so mask it out along with the other status bits. | |
5371 | */ | |
5372 | masked_status = status & (INTR_MASK | STS_FLR); | |
5373 | ||
5374 | /* Shared IRQ? */ | |
5375 | if (!masked_status || | |
5376 | unlikely(fotg210->rh_state == FOTG210_RH_HALTED)) { | |
5377 | spin_unlock(&fotg210->lock); | |
5378 | return IRQ_NONE; | |
5379 | } | |
5380 | ||
5381 | /* clear (just) interrupts */ | |
5382 | fotg210_writel(fotg210, masked_status, &fotg210->regs->status); | |
5383 | cmd = fotg210_readl(fotg210, &fotg210->regs->command); | |
5384 | bh = 0; | |
5385 | ||
7d50195f FHC |
5386 | /* unrequested/ignored: Frame List Rollover */ |
5387 | dbg_status(fotg210, "irq", status); | |
7d50195f FHC |
5388 | |
5389 | /* INT, ERR, and IAA interrupt rates can be throttled */ | |
5390 | ||
5391 | /* normal [4.15.1.2] or error [4.15.1.1] completion */ | |
5392 | if (likely((status & (STS_INT|STS_ERR)) != 0)) { | |
5393 | if (likely((status & STS_ERR) == 0)) | |
5394 | COUNT(fotg210->stats.normal); | |
5395 | else | |
5396 | COUNT(fotg210->stats.error); | |
5397 | bh = 1; | |
5398 | } | |
5399 | ||
5400 | /* complete the unlinking of some qh [4.15.2.3] */ | |
5401 | if (status & STS_IAA) { | |
5402 | ||
5403 | /* Turn off the IAA watchdog */ | |
5404 | fotg210->enabled_hrtimer_events &= | |
5405 | ~BIT(FOTG210_HRTIMER_IAA_WATCHDOG); | |
5406 | ||
5407 | /* | |
5408 | * Mild optimization: Allow another IAAD to reset the | |
5409 | * hrtimer, if one occurs before the next expiration. | |
5410 | * In theory we could always cancel the hrtimer, but | |
5411 | * tests show that about half the time it will be reset | |
5412 | * for some other event anyway. | |
5413 | */ | |
5414 | if (fotg210->next_hrtimer_event == FOTG210_HRTIMER_IAA_WATCHDOG) | |
5415 | ++fotg210->next_hrtimer_event; | |
5416 | ||
5417 | /* guard against (alleged) silicon errata */ | |
5418 | if (cmd & CMD_IAAD) | |
5419 | fotg210_dbg(fotg210, "IAA with IAAD still set?\n"); | |
5420 | if (fotg210->async_iaa) { | |
5421 | COUNT(fotg210->stats.iaa); | |
5422 | end_unlink_async(fotg210); | |
5423 | } else | |
5424 | fotg210_dbg(fotg210, "IAA with nothing unlinked?\n"); | |
5425 | } | |
5426 | ||
5427 | /* remote wakeup [4.3.1] */ | |
5428 | if (status & STS_PCD) { | |
5429 | int pstatus; | |
5430 | u32 __iomem *status_reg = &fotg210->regs->port_status; | |
5431 | ||
5432 | /* kick root hub later */ | |
5433 | pcd_status = status; | |
5434 | ||
5435 | /* resume root hub? */ | |
5436 | if (fotg210->rh_state == FOTG210_RH_SUSPENDED) | |
5437 | usb_hcd_resume_root_hub(hcd); | |
5438 | ||
5439 | pstatus = fotg210_readl(fotg210, status_reg); | |
5440 | ||
5441 | if (test_bit(0, &fotg210->suspended_ports) && | |
5442 | ((pstatus & PORT_RESUME) || | |
5443 | !(pstatus & PORT_SUSPEND)) && | |
5444 | (pstatus & PORT_PE) && | |
5445 | fotg210->reset_done[0] == 0) { | |
5446 | ||
5447 | /* start 20 msec resume signaling from this port, | |
5448 | * and make khubd collect PORT_STAT_C_SUSPEND to | |
5449 | * stop that signaling. Use 5 ms extra for safety, | |
5450 | * like usb_port_resume() does. | |
5451 | */ | |
5452 | fotg210->reset_done[0] = jiffies + msecs_to_jiffies(25); | |
5453 | set_bit(0, &fotg210->resuming_ports); | |
5454 | fotg210_dbg(fotg210, "port 1 remote wakeup\n"); | |
5455 | mod_timer(&hcd->rh_timer, fotg210->reset_done[0]); | |
5456 | } | |
5457 | } | |
5458 | ||
5459 | /* PCI errors [4.15.2.4] */ | |
5460 | if (unlikely((status & STS_FATAL) != 0)) { | |
5461 | fotg210_err(fotg210, "fatal error\n"); | |
5462 | dbg_cmd(fotg210, "fatal", cmd); | |
5463 | dbg_status(fotg210, "fatal", status); | |
5464 | dead: | |
5465 | usb_hc_died(hcd); | |
5466 | ||
5467 | /* Don't let the controller do anything more */ | |
5468 | fotg210->shutdown = true; | |
5469 | fotg210->rh_state = FOTG210_RH_STOPPING; | |
5470 | fotg210->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE); | |
5471 | fotg210_writel(fotg210, fotg210->command, | |
5472 | &fotg210->regs->command); | |
5473 | fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); | |
5474 | fotg210_handle_controller_death(fotg210); | |
5475 | ||
5476 | /* Handle completions when the controller stops */ | |
5477 | bh = 0; | |
5478 | } | |
5479 | ||
5480 | if (bh) | |
5481 | fotg210_work(fotg210); | |
5482 | spin_unlock(&fotg210->lock); | |
5483 | if (pcd_status) | |
5484 | usb_hcd_poll_rh_status(hcd); | |
5485 | return IRQ_HANDLED; | |
5486 | } | |
5487 | ||
5488 | /*-------------------------------------------------------------------------*/ | |
5489 | ||
5490 | /* | |
5491 | * non-error returns are a promise to giveback() the urb later | |
5492 | * we drop ownership so next owner (or urb unlink) can get it | |
5493 | * | |
5494 | * urb + dev is in hcd.self.controller.urb_list | |
5495 | * we're queueing TDs onto software and hardware lists | |
5496 | * | |
5497 | * hcd-specific init for hcpriv hasn't been done yet | |
5498 | * | |
5499 | * NOTE: control, bulk, and interrupt share the same code to append TDs | |
5500 | * to a (possibly active) QH, and the same QH scanning code. | |
5501 | */ | |
5502 | static int fotg210_urb_enqueue( | |
5503 | struct usb_hcd *hcd, | |
5504 | struct urb *urb, | |
5505 | gfp_t mem_flags | |
5506 | ) { | |
5507 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5508 | struct list_head qtd_list; | |
5509 | ||
5510 | INIT_LIST_HEAD(&qtd_list); | |
5511 | ||
5512 | switch (usb_pipetype(urb->pipe)) { | |
5513 | case PIPE_CONTROL: | |
5514 | /* qh_completions() code doesn't handle all the fault cases | |
5515 | * in multi-TD control transfers. Even 1KB is rare anyway. | |
5516 | */ | |
5517 | if (urb->transfer_buffer_length > (16 * 1024)) | |
5518 | return -EMSGSIZE; | |
5519 | /* FALLTHROUGH */ | |
5520 | /* case PIPE_BULK: */ | |
5521 | default: | |
5522 | if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags)) | |
5523 | return -ENOMEM; | |
5524 | return submit_async(fotg210, urb, &qtd_list, mem_flags); | |
5525 | ||
5526 | case PIPE_INTERRUPT: | |
5527 | if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags)) | |
5528 | return -ENOMEM; | |
5529 | return intr_submit(fotg210, urb, &qtd_list, mem_flags); | |
5530 | ||
5531 | case PIPE_ISOCHRONOUS: | |
5532 | return itd_submit(fotg210, urb, mem_flags); | |
5533 | } | |
5534 | } | |
5535 | ||
5536 | /* remove from hardware lists | |
5537 | * completions normally happen asynchronously | |
5538 | */ | |
5539 | ||
5540 | static int fotg210_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) | |
5541 | { | |
5542 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5543 | struct fotg210_qh *qh; | |
5544 | unsigned long flags; | |
5545 | int rc; | |
5546 | ||
5547 | spin_lock_irqsave(&fotg210->lock, flags); | |
5548 | rc = usb_hcd_check_unlink_urb(hcd, urb, status); | |
5549 | if (rc) | |
5550 | goto done; | |
5551 | ||
5552 | switch (usb_pipetype(urb->pipe)) { | |
5553 | /* case PIPE_CONTROL: */ | |
5554 | /* case PIPE_BULK:*/ | |
5555 | default: | |
5556 | qh = (struct fotg210_qh *) urb->hcpriv; | |
5557 | if (!qh) | |
5558 | break; | |
5559 | switch (qh->qh_state) { | |
5560 | case QH_STATE_LINKED: | |
5561 | case QH_STATE_COMPLETING: | |
5562 | start_unlink_async(fotg210, qh); | |
5563 | break; | |
5564 | case QH_STATE_UNLINK: | |
5565 | case QH_STATE_UNLINK_WAIT: | |
5566 | /* already started */ | |
5567 | break; | |
5568 | case QH_STATE_IDLE: | |
5569 | /* QH might be waiting for a Clear-TT-Buffer */ | |
5570 | qh_completions(fotg210, qh); | |
5571 | break; | |
5572 | } | |
5573 | break; | |
5574 | ||
5575 | case PIPE_INTERRUPT: | |
5576 | qh = (struct fotg210_qh *) urb->hcpriv; | |
5577 | if (!qh) | |
5578 | break; | |
5579 | switch (qh->qh_state) { | |
5580 | case QH_STATE_LINKED: | |
5581 | case QH_STATE_COMPLETING: | |
5582 | start_unlink_intr(fotg210, qh); | |
5583 | break; | |
5584 | case QH_STATE_IDLE: | |
5585 | qh_completions(fotg210, qh); | |
5586 | break; | |
5587 | default: | |
5588 | fotg210_dbg(fotg210, "bogus qh %p state %d\n", | |
5589 | qh, qh->qh_state); | |
5590 | goto done; | |
5591 | } | |
5592 | break; | |
5593 | ||
5594 | case PIPE_ISOCHRONOUS: | |
5595 | /* itd... */ | |
5596 | ||
5597 | /* wait till next completion, do it then. */ | |
5598 | /* completion irqs can wait up to 1024 msec, */ | |
5599 | break; | |
5600 | } | |
5601 | done: | |
5602 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5603 | return rc; | |
5604 | } | |
5605 | ||
5606 | /*-------------------------------------------------------------------------*/ | |
5607 | ||
5608 | /* bulk qh holds the data toggle */ | |
5609 | ||
5610 | static void | |
5611 | fotg210_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep) | |
5612 | { | |
5613 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5614 | unsigned long flags; | |
5615 | struct fotg210_qh *qh, *tmp; | |
5616 | ||
5617 | /* ASSERT: any requests/urbs are being unlinked */ | |
5618 | /* ASSERT: nobody can be submitting urbs for this any more */ | |
5619 | ||
5620 | rescan: | |
5621 | spin_lock_irqsave(&fotg210->lock, flags); | |
5622 | qh = ep->hcpriv; | |
5623 | if (!qh) | |
5624 | goto done; | |
5625 | ||
5626 | /* endpoints can be iso streams. for now, we don't | |
5627 | * accelerate iso completions ... so spin a while. | |
5628 | */ | |
5629 | if (qh->hw == NULL) { | |
5630 | struct fotg210_iso_stream *stream = ep->hcpriv; | |
5631 | ||
5632 | if (!list_empty(&stream->td_list)) | |
5633 | goto idle_timeout; | |
5634 | ||
5635 | /* BUG_ON(!list_empty(&stream->free_list)); */ | |
5636 | kfree(stream); | |
5637 | goto done; | |
5638 | } | |
5639 | ||
5640 | if (fotg210->rh_state < FOTG210_RH_RUNNING) | |
5641 | qh->qh_state = QH_STATE_IDLE; | |
5642 | switch (qh->qh_state) { | |
5643 | case QH_STATE_LINKED: | |
5644 | case QH_STATE_COMPLETING: | |
5645 | for (tmp = fotg210->async->qh_next.qh; | |
5646 | tmp && tmp != qh; | |
5647 | tmp = tmp->qh_next.qh) | |
5648 | continue; | |
5649 | /* periodic qh self-unlinks on empty, and a COMPLETING qh | |
5650 | * may already be unlinked. | |
5651 | */ | |
5652 | if (tmp) | |
5653 | start_unlink_async(fotg210, qh); | |
5654 | /* FALL THROUGH */ | |
5655 | case QH_STATE_UNLINK: /* wait for hw to finish? */ | |
5656 | case QH_STATE_UNLINK_WAIT: | |
5657 | idle_timeout: | |
5658 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5659 | schedule_timeout_uninterruptible(1); | |
5660 | goto rescan; | |
5661 | case QH_STATE_IDLE: /* fully unlinked */ | |
5662 | if (qh->clearing_tt) | |
5663 | goto idle_timeout; | |
5664 | if (list_empty(&qh->qtd_list)) { | |
5665 | qh_destroy(fotg210, qh); | |
5666 | break; | |
5667 | } | |
5668 | /* else FALL THROUGH */ | |
5669 | default: | |
5670 | /* caller was supposed to have unlinked any requests; | |
5671 | * that's not our job. just leak this memory. | |
5672 | */ | |
5673 | fotg210_err(fotg210, "qh %p (#%02x) state %d%s\n", | |
5674 | qh, ep->desc.bEndpointAddress, qh->qh_state, | |
5675 | list_empty(&qh->qtd_list) ? "" : "(has tds)"); | |
5676 | break; | |
5677 | } | |
5678 | done: | |
5679 | ep->hcpriv = NULL; | |
5680 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5681 | } | |
5682 | ||
5683 | static void | |
5684 | fotg210_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep) | |
5685 | { | |
5686 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5687 | struct fotg210_qh *qh; | |
5688 | int eptype = usb_endpoint_type(&ep->desc); | |
5689 | int epnum = usb_endpoint_num(&ep->desc); | |
5690 | int is_out = usb_endpoint_dir_out(&ep->desc); | |
5691 | unsigned long flags; | |
5692 | ||
5693 | if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT) | |
5694 | return; | |
5695 | ||
5696 | spin_lock_irqsave(&fotg210->lock, flags); | |
5697 | qh = ep->hcpriv; | |
5698 | ||
5699 | /* For Bulk and Interrupt endpoints we maintain the toggle state | |
5700 | * in the hardware; the toggle bits in udev aren't used at all. | |
5701 | * When an endpoint is reset by usb_clear_halt() we must reset | |
5702 | * the toggle bit in the QH. | |
5703 | */ | |
5704 | if (qh) { | |
5705 | usb_settoggle(qh->dev, epnum, is_out, 0); | |
5706 | if (!list_empty(&qh->qtd_list)) { | |
5707 | WARN_ONCE(1, "clear_halt for a busy endpoint\n"); | |
5708 | } else if (qh->qh_state == QH_STATE_LINKED || | |
5709 | qh->qh_state == QH_STATE_COMPLETING) { | |
5710 | ||
5711 | /* The toggle value in the QH can't be updated | |
5712 | * while the QH is active. Unlink it now; | |
5713 | * re-linking will call qh_refresh(). | |
5714 | */ | |
5715 | if (eptype == USB_ENDPOINT_XFER_BULK) | |
5716 | start_unlink_async(fotg210, qh); | |
5717 | else | |
5718 | start_unlink_intr(fotg210, qh); | |
5719 | } | |
5720 | } | |
5721 | spin_unlock_irqrestore(&fotg210->lock, flags); | |
5722 | } | |
5723 | ||
5724 | static int fotg210_get_frame(struct usb_hcd *hcd) | |
5725 | { | |
5726 | struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); | |
5727 | return (fotg210_read_frame_index(fotg210) >> 3) % | |
5728 | fotg210->periodic_size; | |
5729 | } | |
5730 | ||
5731 | /*-------------------------------------------------------------------------*/ | |
5732 | ||
5733 | /* | |
5734 | * The EHCI in ChipIdea HDRC cannot be a separate module or device, | |
5735 | * because its registers (and irq) are shared between host/gadget/otg | |
5736 | * functions and in order to facilitate role switching we cannot | |
5737 | * give the fotg210 driver exclusive access to those. | |
5738 | */ | |
5739 | MODULE_DESCRIPTION(DRIVER_DESC); | |
5740 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
5741 | MODULE_LICENSE("GPL"); | |
5742 | ||
5743 | static const struct hc_driver fotg210_fotg210_hc_driver = { | |
5744 | .description = hcd_name, | |
5745 | .product_desc = "Faraday USB2.0 Host Controller", | |
5746 | .hcd_priv_size = sizeof(struct fotg210_hcd), | |
5747 | ||
5748 | /* | |
5749 | * generic hardware linkage | |
5750 | */ | |
5751 | .irq = fotg210_irq, | |
5752 | .flags = HCD_MEMORY | HCD_USB2, | |
5753 | ||
5754 | /* | |
5755 | * basic lifecycle operations | |
5756 | */ | |
5757 | .reset = hcd_fotg210_init, | |
5758 | .start = fotg210_run, | |
5759 | .stop = fotg210_stop, | |
5760 | .shutdown = fotg210_shutdown, | |
5761 | ||
5762 | /* | |
5763 | * managing i/o requests and associated device resources | |
5764 | */ | |
5765 | .urb_enqueue = fotg210_urb_enqueue, | |
5766 | .urb_dequeue = fotg210_urb_dequeue, | |
5767 | .endpoint_disable = fotg210_endpoint_disable, | |
5768 | .endpoint_reset = fotg210_endpoint_reset, | |
5769 | ||
5770 | /* | |
5771 | * scheduling support | |
5772 | */ | |
5773 | .get_frame_number = fotg210_get_frame, | |
5774 | ||
5775 | /* | |
5776 | * root hub support | |
5777 | */ | |
5778 | .hub_status_data = fotg210_hub_status_data, | |
5779 | .hub_control = fotg210_hub_control, | |
5780 | .bus_suspend = fotg210_bus_suspend, | |
5781 | .bus_resume = fotg210_bus_resume, | |
5782 | ||
5783 | .relinquish_port = fotg210_relinquish_port, | |
5784 | .port_handed_over = fotg210_port_handed_over, | |
5785 | ||
5786 | .clear_tt_buffer_complete = fotg210_clear_tt_buffer_complete, | |
5787 | }; | |
5788 | ||
5789 | static void fotg210_init(struct fotg210_hcd *fotg210) | |
5790 | { | |
5791 | u32 value; | |
5792 | ||
5793 | iowrite32(GMIR_MDEV_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY, | |
5794 | &fotg210->regs->gmir); | |
5795 | ||
5796 | value = ioread32(&fotg210->regs->otgcsr); | |
5797 | value &= ~OTGCSR_A_BUS_DROP; | |
5798 | value |= OTGCSR_A_BUS_REQ; | |
5799 | iowrite32(value, &fotg210->regs->otgcsr); | |
5800 | } | |
5801 | ||
5802 | /** | |
5803 | * fotg210_hcd_probe - initialize faraday FOTG210 HCDs | |
5804 | * | |
5805 | * Allocates basic resources for this USB host controller, and | |
5806 | * then invokes the start() method for the HCD associated with it | |
5807 | * through the hotplug entry's driver_data. | |
5808 | */ | |
5809 | static int fotg210_hcd_probe(struct platform_device *pdev) | |
5810 | { | |
5811 | struct device *dev = &pdev->dev; | |
5812 | struct usb_hcd *hcd; | |
5813 | struct resource *res; | |
5814 | int irq; | |
5815 | int retval = -ENODEV; | |
5816 | struct fotg210_hcd *fotg210; | |
5817 | ||
5818 | if (usb_disabled()) | |
5819 | return -ENODEV; | |
5820 | ||
5821 | pdev->dev.power.power_state = PMSG_ON; | |
5822 | ||
5823 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
5824 | if (!res) { | |
5825 | dev_err(dev, | |
5826 | "Found HC with no IRQ. Check %s setup!\n", | |
5827 | dev_name(dev)); | |
5828 | return -ENODEV; | |
5829 | } | |
5830 | ||
5831 | irq = res->start; | |
5832 | ||
5833 | hcd = usb_create_hcd(&fotg210_fotg210_hc_driver, dev, | |
5834 | dev_name(dev)); | |
5835 | if (!hcd) { | |
5836 | dev_err(dev, "failed to create hcd with err %d\n", retval); | |
5837 | retval = -ENOMEM; | |
5838 | goto fail_create_hcd; | |
5839 | } | |
5840 | ||
0e278b34 HS |
5841 | hcd->has_tt = 1; |
5842 | ||
7d50195f | 5843 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
0e278b34 HS |
5844 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
5845 | if (IS_ERR(hcd->regs)) { | |
5846 | retval = PTR_ERR(hcd->regs); | |
5847 | goto failed; | |
7d50195f FHC |
5848 | } |
5849 | ||
5850 | hcd->rsrc_start = res->start; | |
5851 | hcd->rsrc_len = resource_size(res); | |
7d50195f FHC |
5852 | |
5853 | fotg210 = hcd_to_fotg210(hcd); | |
5854 | ||
5855 | fotg210->caps = hcd->regs; | |
5856 | ||
5857 | retval = fotg210_setup(hcd); | |
5858 | if (retval) | |
0e278b34 | 5859 | goto failed; |
7d50195f FHC |
5860 | |
5861 | fotg210_init(fotg210); | |
5862 | ||
5863 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
5864 | if (retval) { | |
5865 | dev_err(dev, "failed to add hcd with err %d\n", retval); | |
0e278b34 | 5866 | goto failed; |
7d50195f | 5867 | } |
3c9740a1 | 5868 | device_wakeup_enable(hcd->self.controller); |
7d50195f FHC |
5869 | |
5870 | return retval; | |
5871 | ||
0e278b34 | 5872 | failed: |
7d50195f FHC |
5873 | usb_put_hcd(hcd); |
5874 | fail_create_hcd: | |
5875 | dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval); | |
5876 | return retval; | |
5877 | } | |
5878 | ||
5879 | /** | |
5880 | * fotg210_hcd_remove - shutdown processing for EHCI HCDs | |
5881 | * @dev: USB Host Controller being removed | |
5882 | * | |
5883 | */ | |
5884 | static int fotg210_hcd_remove(struct platform_device *pdev) | |
5885 | { | |
5886 | struct device *dev = &pdev->dev; | |
5887 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
5888 | ||
5889 | if (!hcd) | |
5890 | return 0; | |
5891 | ||
5892 | usb_remove_hcd(hcd); | |
7d50195f FHC |
5893 | usb_put_hcd(hcd); |
5894 | ||
5895 | return 0; | |
5896 | } | |
5897 | ||
5898 | static struct platform_driver fotg210_hcd_driver = { | |
5899 | .driver = { | |
5900 | .name = "fotg210-hcd", | |
5901 | }, | |
5902 | .probe = fotg210_hcd_probe, | |
5903 | .remove = fotg210_hcd_remove, | |
5904 | }; | |
5905 | ||
5906 | static int __init fotg210_hcd_init(void) | |
5907 | { | |
5908 | int retval = 0; | |
5909 | ||
5910 | if (usb_disabled()) | |
5911 | return -ENODEV; | |
5912 | ||
5913 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); | |
5914 | set_bit(USB_EHCI_LOADED, &usb_hcds_loaded); | |
5915 | if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) || | |
5916 | test_bit(USB_OHCI_LOADED, &usb_hcds_loaded)) | |
5917 | pr_warn(KERN_WARNING "Warning! fotg210_hcd should always be loaded before uhci_hcd and ohci_hcd, not after\n"); | |
5918 | ||
5919 | pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n", | |
5920 | hcd_name, | |
5921 | sizeof(struct fotg210_qh), sizeof(struct fotg210_qtd), | |
5922 | sizeof(struct fotg210_itd)); | |
5923 | ||
7d50195f FHC |
5924 | fotg210_debug_root = debugfs_create_dir("fotg210", usb_debug_root); |
5925 | if (!fotg210_debug_root) { | |
5926 | retval = -ENOENT; | |
5927 | goto err_debug; | |
5928 | } | |
7d50195f FHC |
5929 | |
5930 | retval = platform_driver_register(&fotg210_hcd_driver); | |
5931 | if (retval < 0) | |
5932 | goto clean; | |
5933 | return retval; | |
5934 | ||
5935 | platform_driver_unregister(&fotg210_hcd_driver); | |
5936 | clean: | |
7d50195f FHC |
5937 | debugfs_remove(fotg210_debug_root); |
5938 | fotg210_debug_root = NULL; | |
5939 | err_debug: | |
7d50195f FHC |
5940 | clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); |
5941 | return retval; | |
5942 | } | |
5943 | module_init(fotg210_hcd_init); | |
5944 | ||
5945 | static void __exit fotg210_hcd_cleanup(void) | |
5946 | { | |
5947 | platform_driver_unregister(&fotg210_hcd_driver); | |
7d50195f | 5948 | debugfs_remove(fotg210_debug_root); |
7d50195f FHC |
5949 | clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); |
5950 | } | |
5951 | module_exit(fotg210_hcd_cleanup); |