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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
91777826 JW |
2 | /* |
3 | * Standalone EHCI usb debug driver | |
4 | * | |
5 | * Originally written by: | |
6 | * Eric W. Biederman" <ebiederm@xmission.com> and | |
7 | * Yinghai Lu <yhlu.kernel@gmail.com> | |
8 | * | |
9 | * Changes for early/late printk and HW errata: | |
10 | * Jason Wessel <jason.wessel@windriver.com> | |
11 | * Copyright (C) 2009 Wind River Systems, Inc. | |
12 | * | |
13 | */ | |
14 | ||
df6c5169 JW |
15 | #include <linux/console.h> |
16 | #include <linux/errno.h> | |
4e84e221 | 17 | #include <linux/init.h> |
8f01cc87 | 18 | #include <linux/iopoll.h> |
df6c5169 JW |
19 | #include <linux/pci_regs.h> |
20 | #include <linux/pci_ids.h> | |
21 | #include <linux/usb/ch9.h> | |
22 | #include <linux/usb/ehci_def.h> | |
23 | #include <linux/delay.h> | |
4fe1da4e JW |
24 | #include <linux/serial_core.h> |
25 | #include <linux/kgdb.h> | |
26 | #include <linux/kthread.h> | |
df6c5169 JW |
27 | #include <asm/io.h> |
28 | #include <asm/pci-direct.h> | |
29 | #include <asm/fixmap.h> | |
30 | ||
91777826 JW |
31 | /* The code here is intended to talk directly to the EHCI debug port |
32 | * and does not require that you have any kind of USB host controller | |
33 | * drivers or USB device drivers compiled into the kernel. | |
34 | * | |
35 | * If you make a change to anything in here, the following test cases | |
36 | * need to pass where a USB debug device works in the following | |
37 | * configurations. | |
38 | * | |
39 | * 1. boot args: earlyprintk=dbgp | |
40 | * o kernel compiled with # CONFIG_USB_EHCI_HCD is not set | |
41 | * o kernel compiled with CONFIG_USB_EHCI_HCD=y | |
42 | * 2. boot args: earlyprintk=dbgp,keep | |
43 | * o kernel compiled with # CONFIG_USB_EHCI_HCD is not set | |
44 | * o kernel compiled with CONFIG_USB_EHCI_HCD=y | |
45 | * 3. boot args: earlyprintk=dbgp console=ttyUSB0 | |
46 | * o kernel has CONFIG_USB_EHCI_HCD=y and | |
47 | * CONFIG_USB_SERIAL_DEBUG=y | |
48 | * 4. boot args: earlyprintk=vga,dbgp | |
49 | * o kernel compiled with # CONFIG_USB_EHCI_HCD is not set | |
50 | * o kernel compiled with CONFIG_USB_EHCI_HCD=y | |
51 | * | |
52 | * For the 4th configuration you can turn on or off the DBGP_DEBUG | |
53 | * such that you can debug the dbgp device's driver code. | |
54 | */ | |
55 | ||
56 | static int dbgp_phys_port = 1; | |
56faf0f9 | 57 | |
df6c5169 JW |
58 | static struct ehci_caps __iomem *ehci_caps; |
59 | static struct ehci_regs __iomem *ehci_regs; | |
60 | static struct ehci_dbg_port __iomem *ehci_debug; | |
91777826 | 61 | static int dbgp_not_safe; /* Cannot use debug device during ehci reset */ |
df6c5169 | 62 | static unsigned int dbgp_endpoint_out; |
4fe1da4e | 63 | static unsigned int dbgp_endpoint_in; |
df6c5169 JW |
64 | |
65 | struct ehci_dev { | |
66 | u32 bus; | |
67 | u32 slot; | |
68 | u32 func; | |
69 | }; | |
70 | ||
71 | static struct ehci_dev ehci_dev; | |
72 | ||
73 | #define USB_DEBUG_DEVNUM 127 | |
74 | ||
91777826 JW |
75 | #ifdef DBGP_DEBUG |
76 | #define dbgp_printk printk | |
77 | static void dbgp_ehci_status(char *str) | |
78 | { | |
79 | if (!ehci_debug) | |
80 | return; | |
81 | dbgp_printk("dbgp: %s\n", str); | |
82 | dbgp_printk(" Debug control: %08x", readl(&ehci_debug->control)); | |
83 | dbgp_printk(" ehci cmd : %08x", readl(&ehci_regs->command)); | |
84 | dbgp_printk(" ehci conf flg: %08x\n", | |
85 | readl(&ehci_regs->configured_flag)); | |
86 | dbgp_printk(" ehci status : %08x", readl(&ehci_regs->status)); | |
87 | dbgp_printk(" ehci portsc : %08x\n", | |
88 | readl(&ehci_regs->port_status[dbgp_phys_port - 1])); | |
89 | } | |
90 | #else | |
91 | static inline void dbgp_ehci_status(char *str) { } | |
92 | static inline void dbgp_printk(const char *fmt, ...) { } | |
93 | #endif | |
94 | ||
df6c5169 JW |
95 | static inline u32 dbgp_len_update(u32 x, u32 len) |
96 | { | |
97 | return (x & ~0x0f) | (len & 0x0f); | |
98 | } | |
99 | ||
4fe1da4e JW |
100 | #ifdef CONFIG_KGDB |
101 | static struct kgdb_io kgdbdbgp_io_ops; | |
102 | #define dbgp_kgdb_mode (dbg_io_ops == &kgdbdbgp_io_ops) | |
103 | #else | |
104 | #define dbgp_kgdb_mode (0) | |
105 | #endif | |
106 | ||
c430131a JA |
107 | /* Local version of HC_LENGTH macro as ehci struct is not available here */ |
108 | #define EARLY_HC_LENGTH(p) (0x00ff & (p)) /* bits 7 : 0 */ | |
109 | ||
df6c5169 JW |
110 | /* |
111 | * USB Packet IDs (PIDs) | |
112 | */ | |
113 | ||
114 | /* token */ | |
115 | #define USB_PID_OUT 0xe1 | |
116 | #define USB_PID_IN 0x69 | |
117 | #define USB_PID_SOF 0xa5 | |
118 | #define USB_PID_SETUP 0x2d | |
119 | /* handshake */ | |
120 | #define USB_PID_ACK 0xd2 | |
121 | #define USB_PID_NAK 0x5a | |
122 | #define USB_PID_STALL 0x1e | |
123 | #define USB_PID_NYET 0x96 | |
124 | /* data */ | |
125 | #define USB_PID_DATA0 0xc3 | |
126 | #define USB_PID_DATA1 0x4b | |
127 | #define USB_PID_DATA2 0x87 | |
128 | #define USB_PID_MDATA 0x0f | |
129 | /* Special */ | |
130 | #define USB_PID_PREAMBLE 0x3c | |
131 | #define USB_PID_ERR 0x3c | |
132 | #define USB_PID_SPLIT 0x78 | |
133 | #define USB_PID_PING 0xb4 | |
134 | #define USB_PID_UNDEF_0 0xf0 | |
135 | ||
136 | #define USB_PID_DATA_TOGGLE 0x88 | |
137 | #define DBGP_CLAIM (DBGP_OWNER | DBGP_ENABLED | DBGP_INUSE) | |
138 | ||
139 | #define PCI_CAP_ID_EHCI_DEBUG 0xa | |
140 | ||
141 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
142 | #define HUB_SHORT_RESET_TIME 10 | |
143 | #define HUB_LONG_RESET_TIME 200 | |
144 | #define HUB_RESET_TIMEOUT 500 | |
145 | ||
146 | #define DBGP_MAX_PACKET 8 | |
91777826 | 147 | #define DBGP_TIMEOUT (250 * 1000) |
815e173e JW |
148 | #define DBGP_LOOPS 1000 |
149 | ||
150 | static inline u32 dbgp_pid_write_update(u32 x, u32 tok) | |
151 | { | |
152 | static int data0 = USB_PID_DATA1; | |
153 | data0 ^= USB_PID_DATA_TOGGLE; | |
154 | return (x & 0xffff0000) | (data0 << 8) | (tok & 0xff); | |
155 | } | |
156 | ||
157 | static inline u32 dbgp_pid_read_update(u32 x, u32 tok) | |
158 | { | |
159 | return (x & 0xffff0000) | (USB_PID_DATA0 << 8) | (tok & 0xff); | |
160 | } | |
df6c5169 JW |
161 | |
162 | static int dbgp_wait_until_complete(void) | |
163 | { | |
164 | u32 ctrl; | |
8f01cc87 | 165 | int ret; |
df6c5169 | 166 | |
8f01cc87 CY |
167 | ret = readl_poll_timeout_atomic(&ehci_debug->control, ctrl, |
168 | (ctrl & DBGP_DONE), 1, DBGP_TIMEOUT); | |
169 | if (ret) | |
91777826 | 170 | return -DBGP_TIMEOUT; |
df6c5169 JW |
171 | |
172 | /* | |
173 | * Now that we have observed the completed transaction, | |
174 | * clear the done bit. | |
175 | */ | |
176 | writel(ctrl | DBGP_DONE, &ehci_debug->control); | |
177 | return (ctrl & DBGP_ERROR) ? -DBGP_ERRCODE(ctrl) : DBGP_LEN(ctrl); | |
178 | } | |
179 | ||
91777826 | 180 | static inline void dbgp_mdelay(int ms) |
df6c5169 JW |
181 | { |
182 | int i; | |
183 | ||
184 | while (ms--) { | |
185 | for (i = 0; i < 1000; i++) | |
186 | outb(0x1, 0x80); | |
187 | } | |
188 | } | |
189 | ||
190 | static void dbgp_breath(void) | |
191 | { | |
192 | /* Sleep to give the debug port a chance to breathe */ | |
193 | } | |
194 | ||
4fe1da4e | 195 | static int dbgp_wait_until_done(unsigned ctrl, int loop) |
df6c5169 JW |
196 | { |
197 | u32 pids, lpid; | |
198 | int ret; | |
df6c5169 JW |
199 | |
200 | retry: | |
201 | writel(ctrl | DBGP_GO, &ehci_debug->control); | |
202 | ret = dbgp_wait_until_complete(); | |
203 | pids = readl(&ehci_debug->pids); | |
204 | lpid = DBGP_PID_GET(pids); | |
205 | ||
91777826 JW |
206 | if (ret < 0) { |
207 | /* A -DBGP_TIMEOUT failure here means the device has | |
208 | * failed, perhaps because it was unplugged, in which | |
209 | * case we do not want to hang the system so the dbgp | |
210 | * will be marked as unsafe to use. EHCI reset is the | |
211 | * only way to recover if you unplug the dbgp device. | |
212 | */ | |
213 | if (ret == -DBGP_TIMEOUT && !dbgp_not_safe) | |
214 | dbgp_not_safe = 1; | |
815e173e JW |
215 | if (ret == -DBGP_ERR_BAD && --loop > 0) |
216 | goto retry; | |
df6c5169 | 217 | return ret; |
91777826 | 218 | } |
df6c5169 JW |
219 | |
220 | /* | |
221 | * If the port is getting full or it has dropped data | |
222 | * start pacing ourselves, not necessary but it's friendly. | |
223 | */ | |
224 | if ((lpid == USB_PID_NAK) || (lpid == USB_PID_NYET)) | |
225 | dbgp_breath(); | |
226 | ||
227 | /* If I get a NACK reissue the transmission */ | |
228 | if (lpid == USB_PID_NAK) { | |
229 | if (--loop > 0) | |
230 | goto retry; | |
231 | } | |
232 | ||
233 | return ret; | |
234 | } | |
235 | ||
91777826 | 236 | static inline void dbgp_set_data(const void *buf, int size) |
df6c5169 JW |
237 | { |
238 | const unsigned char *bytes = buf; | |
239 | u32 lo, hi; | |
240 | int i; | |
241 | ||
242 | lo = hi = 0; | |
243 | for (i = 0; i < 4 && i < size; i++) | |
244 | lo |= bytes[i] << (8*i); | |
245 | for (; i < 8 && i < size; i++) | |
246 | hi |= bytes[i] << (8*(i - 4)); | |
247 | writel(lo, &ehci_debug->data03); | |
248 | writel(hi, &ehci_debug->data47); | |
249 | } | |
250 | ||
91777826 | 251 | static inline void dbgp_get_data(void *buf, int size) |
df6c5169 JW |
252 | { |
253 | unsigned char *bytes = buf; | |
254 | u32 lo, hi; | |
255 | int i; | |
256 | ||
257 | lo = readl(&ehci_debug->data03); | |
258 | hi = readl(&ehci_debug->data47); | |
259 | for (i = 0; i < 4 && i < size; i++) | |
260 | bytes[i] = (lo >> (8*i)) & 0xff; | |
261 | for (; i < 8 && i < size; i++) | |
262 | bytes[i] = (hi >> (8*(i - 4))) & 0xff; | |
263 | } | |
264 | ||
815e173e JW |
265 | static int dbgp_bulk_write(unsigned devnum, unsigned endpoint, |
266 | const char *bytes, int size) | |
df6c5169 | 267 | { |
815e173e JW |
268 | int ret; |
269 | u32 addr; | |
68d2956a | 270 | u32 pids, ctrl; |
df6c5169 | 271 | |
815e173e JW |
272 | if (size > DBGP_MAX_PACKET) |
273 | return -1; | |
274 | ||
275 | addr = DBGP_EPADDR(devnum, endpoint); | |
276 | ||
df6c5169 | 277 | pids = readl(&ehci_debug->pids); |
815e173e | 278 | pids = dbgp_pid_write_update(pids, USB_PID_OUT); |
df6c5169 JW |
279 | |
280 | ctrl = readl(&ehci_debug->control); | |
281 | ctrl = dbgp_len_update(ctrl, size); | |
282 | ctrl |= DBGP_OUT; | |
283 | ctrl |= DBGP_GO; | |
284 | ||
285 | dbgp_set_data(bytes, size); | |
286 | writel(addr, &ehci_debug->address); | |
287 | writel(pids, &ehci_debug->pids); | |
4fe1da4e | 288 | ret = dbgp_wait_until_done(ctrl, DBGP_LOOPS); |
df6c5169 JW |
289 | |
290 | return ret; | |
291 | } | |
292 | ||
91777826 | 293 | static int dbgp_bulk_read(unsigned devnum, unsigned endpoint, void *data, |
4fe1da4e | 294 | int size, int loops) |
df6c5169 JW |
295 | { |
296 | u32 pids, addr, ctrl; | |
297 | int ret; | |
298 | ||
299 | if (size > DBGP_MAX_PACKET) | |
300 | return -1; | |
301 | ||
302 | addr = DBGP_EPADDR(devnum, endpoint); | |
303 | ||
304 | pids = readl(&ehci_debug->pids); | |
815e173e | 305 | pids = dbgp_pid_read_update(pids, USB_PID_IN); |
df6c5169 JW |
306 | |
307 | ctrl = readl(&ehci_debug->control); | |
308 | ctrl = dbgp_len_update(ctrl, size); | |
309 | ctrl &= ~DBGP_OUT; | |
310 | ctrl |= DBGP_GO; | |
311 | ||
312 | writel(addr, &ehci_debug->address); | |
313 | writel(pids, &ehci_debug->pids); | |
4fe1da4e | 314 | ret = dbgp_wait_until_done(ctrl, loops); |
df6c5169 JW |
315 | if (ret < 0) |
316 | return ret; | |
317 | ||
318 | if (size > ret) | |
319 | size = ret; | |
320 | dbgp_get_data(data, size); | |
321 | return ret; | |
322 | } | |
323 | ||
91777826 | 324 | static int dbgp_control_msg(unsigned devnum, int requesttype, |
df6c5169 JW |
325 | int request, int value, int index, void *data, int size) |
326 | { | |
327 | u32 pids, addr, ctrl; | |
328 | struct usb_ctrlrequest req; | |
329 | int read; | |
330 | int ret; | |
331 | ||
332 | read = (requesttype & USB_DIR_IN) != 0; | |
4d4847b8 | 333 | if (size > (read ? DBGP_MAX_PACKET : 0)) |
df6c5169 JW |
334 | return -1; |
335 | ||
336 | /* Compute the control message */ | |
337 | req.bRequestType = requesttype; | |
338 | req.bRequest = request; | |
339 | req.wValue = cpu_to_le16(value); | |
340 | req.wIndex = cpu_to_le16(index); | |
341 | req.wLength = cpu_to_le16(size); | |
342 | ||
343 | pids = DBGP_PID_SET(USB_PID_DATA0, USB_PID_SETUP); | |
344 | addr = DBGP_EPADDR(devnum, 0); | |
345 | ||
346 | ctrl = readl(&ehci_debug->control); | |
347 | ctrl = dbgp_len_update(ctrl, sizeof(req)); | |
348 | ctrl |= DBGP_OUT; | |
349 | ctrl |= DBGP_GO; | |
350 | ||
351 | /* Send the setup message */ | |
352 | dbgp_set_data(&req, sizeof(req)); | |
353 | writel(addr, &ehci_debug->address); | |
354 | writel(pids, &ehci_debug->pids); | |
4fe1da4e | 355 | ret = dbgp_wait_until_done(ctrl, DBGP_LOOPS); |
df6c5169 JW |
356 | if (ret < 0) |
357 | return ret; | |
358 | ||
359 | /* Read the result */ | |
4fe1da4e | 360 | return dbgp_bulk_read(devnum, 0, data, size, DBGP_LOOPS); |
df6c5169 JW |
361 | } |
362 | ||
df6c5169 JW |
363 | /* Find a PCI capability */ |
364 | static u32 __init find_cap(u32 num, u32 slot, u32 func, int cap) | |
365 | { | |
366 | u8 pos; | |
367 | int bytes; | |
368 | ||
369 | if (!(read_pci_config_16(num, slot, func, PCI_STATUS) & | |
370 | PCI_STATUS_CAP_LIST)) | |
371 | return 0; | |
372 | ||
373 | pos = read_pci_config_byte(num, slot, func, PCI_CAPABILITY_LIST); | |
374 | for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) { | |
375 | u8 id; | |
376 | ||
377 | pos &= ~3; | |
378 | id = read_pci_config_byte(num, slot, func, pos+PCI_CAP_LIST_ID); | |
379 | if (id == 0xff) | |
380 | break; | |
381 | if (id == cap) | |
382 | return pos; | |
383 | ||
384 | pos = read_pci_config_byte(num, slot, func, | |
385 | pos+PCI_CAP_LIST_NEXT); | |
386 | } | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static u32 __init __find_dbgp(u32 bus, u32 slot, u32 func) | |
391 | { | |
392 | u32 class; | |
393 | ||
394 | class = read_pci_config(bus, slot, func, PCI_CLASS_REVISION); | |
395 | if ((class >> 8) != PCI_CLASS_SERIAL_USB_EHCI) | |
396 | return 0; | |
397 | ||
398 | return find_cap(bus, slot, func, PCI_CAP_ID_EHCI_DEBUG); | |
399 | } | |
400 | ||
401 | static u32 __init find_dbgp(int ehci_num, u32 *rbus, u32 *rslot, u32 *rfunc) | |
402 | { | |
403 | u32 bus, slot, func; | |
404 | ||
405 | for (bus = 0; bus < 256; bus++) { | |
406 | for (slot = 0; slot < 32; slot++) { | |
407 | for (func = 0; func < 8; func++) { | |
408 | unsigned cap; | |
409 | ||
410 | cap = __find_dbgp(bus, slot, func); | |
411 | ||
412 | if (!cap) | |
413 | continue; | |
414 | if (ehci_num-- != 0) | |
415 | continue; | |
416 | *rbus = bus; | |
417 | *rslot = slot; | |
418 | *rfunc = func; | |
419 | return cap; | |
420 | } | |
421 | } | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
91777826 JW |
426 | static int dbgp_ehci_startup(void) |
427 | { | |
428 | u32 ctrl, cmd, status; | |
429 | int loop; | |
430 | ||
431 | /* Claim ownership, but do not enable yet */ | |
432 | ctrl = readl(&ehci_debug->control); | |
433 | ctrl |= DBGP_OWNER; | |
434 | ctrl &= ~(DBGP_ENABLED | DBGP_INUSE); | |
435 | writel(ctrl, &ehci_debug->control); | |
436 | udelay(1); | |
437 | ||
438 | dbgp_ehci_status("EHCI startup"); | |
439 | /* Start the ehci running */ | |
440 | cmd = readl(&ehci_regs->command); | |
441 | cmd &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE | CMD_ASE | CMD_RESET); | |
442 | cmd |= CMD_RUN; | |
443 | writel(cmd, &ehci_regs->command); | |
444 | ||
445 | /* Ensure everything is routed to the EHCI */ | |
446 | writel(FLAG_CF, &ehci_regs->configured_flag); | |
447 | ||
448 | /* Wait until the controller is no longer halted */ | |
f96a4216 | 449 | loop = 1000; |
91777826 JW |
450 | do { |
451 | status = readl(&ehci_regs->status); | |
452 | if (!(status & STS_HALT)) | |
453 | break; | |
454 | udelay(1); | |
455 | } while (--loop > 0); | |
456 | ||
457 | if (!loop) { | |
458 | dbgp_printk("ehci can not be started\n"); | |
459 | return -ENODEV; | |
460 | } | |
461 | dbgp_printk("ehci started\n"); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | static int dbgp_ehci_controller_reset(void) | |
466 | { | |
467 | int loop = 250 * 1000; | |
468 | u32 cmd; | |
469 | ||
470 | /* Reset the EHCI controller */ | |
471 | cmd = readl(&ehci_regs->command); | |
472 | cmd |= CMD_RESET; | |
473 | writel(cmd, &ehci_regs->command); | |
474 | do { | |
475 | cmd = readl(&ehci_regs->command); | |
476 | } while ((cmd & CMD_RESET) && (--loop > 0)); | |
477 | ||
478 | if (!loop) { | |
479 | dbgp_printk("can not reset ehci\n"); | |
480 | return -1; | |
481 | } | |
482 | dbgp_ehci_status("ehci reset done"); | |
483 | return 0; | |
484 | } | |
485 | static int ehci_wait_for_port(int port); | |
486 | /* Return 0 on success | |
487 | * Return -ENODEV for any general failure | |
488 | * Return -EIO if wait for port fails | |
489 | */ | |
9fa5780b | 490 | static int _dbgp_external_startup(void) |
91777826 JW |
491 | { |
492 | int devnum; | |
493 | struct usb_debug_descriptor dbgp_desc; | |
494 | int ret; | |
aab2d408 | 495 | u32 ctrl, portsc, cmd; |
91777826 JW |
496 | int dbg_port = dbgp_phys_port; |
497 | int tries = 3; | |
aab2d408 JW |
498 | int reset_port_tries = 1; |
499 | int try_hard_once = 1; | |
91777826 | 500 | |
aab2d408 | 501 | try_port_reset_again: |
91777826 JW |
502 | ret = dbgp_ehci_startup(); |
503 | if (ret) | |
504 | return ret; | |
505 | ||
506 | /* Wait for a device to show up in the debug port */ | |
507 | ret = ehci_wait_for_port(dbg_port); | |
508 | if (ret < 0) { | |
509 | portsc = readl(&ehci_regs->port_status[dbg_port - 1]); | |
aab2d408 JW |
510 | if (!(portsc & PORT_CONNECT) && try_hard_once) { |
511 | /* Last ditch effort to try to force enable | |
512 | * the debug device by using the packet test | |
513 | * ehci command to try and wake it up. */ | |
514 | try_hard_once = 0; | |
515 | cmd = readl(&ehci_regs->command); | |
516 | cmd &= ~CMD_RUN; | |
517 | writel(cmd, &ehci_regs->command); | |
518 | portsc = readl(&ehci_regs->port_status[dbg_port - 1]); | |
519 | portsc |= PORT_TEST_PKT; | |
520 | writel(portsc, &ehci_regs->port_status[dbg_port - 1]); | |
521 | dbgp_ehci_status("Trying to force debug port online"); | |
522 | mdelay(50); | |
523 | dbgp_ehci_controller_reset(); | |
524 | goto try_port_reset_again; | |
525 | } else if (reset_port_tries--) { | |
526 | goto try_port_reset_again; | |
527 | } | |
91777826 JW |
528 | dbgp_printk("No device found in debug port\n"); |
529 | return -EIO; | |
530 | } | |
531 | dbgp_ehci_status("wait for port done"); | |
532 | ||
533 | /* Enable the debug port */ | |
534 | ctrl = readl(&ehci_debug->control); | |
535 | ctrl |= DBGP_CLAIM; | |
536 | writel(ctrl, &ehci_debug->control); | |
537 | ctrl = readl(&ehci_debug->control); | |
538 | if ((ctrl & DBGP_CLAIM) != DBGP_CLAIM) { | |
539 | dbgp_printk("No device in debug port\n"); | |
540 | writel(ctrl & ~DBGP_CLAIM, &ehci_debug->control); | |
541 | return -ENODEV; | |
542 | } | |
543 | dbgp_ehci_status("debug ported enabled"); | |
544 | ||
545 | /* Completely transfer the debug device to the debug controller */ | |
546 | portsc = readl(&ehci_regs->port_status[dbg_port - 1]); | |
547 | portsc &= ~PORT_PE; | |
548 | writel(portsc, &ehci_regs->port_status[dbg_port - 1]); | |
549 | ||
550 | dbgp_mdelay(100); | |
551 | ||
552 | try_again: | |
553 | /* Find the debug device and make it device number 127 */ | |
554 | for (devnum = 0; devnum <= 127; devnum++) { | |
555 | ret = dbgp_control_msg(devnum, | |
556 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
557 | USB_REQ_GET_DESCRIPTOR, (USB_DT_DEBUG << 8), 0, | |
558 | &dbgp_desc, sizeof(dbgp_desc)); | |
559 | if (ret > 0) | |
560 | break; | |
561 | } | |
562 | if (devnum > 127) { | |
563 | dbgp_printk("Could not find attached debug device\n"); | |
564 | goto err; | |
565 | } | |
91777826 | 566 | dbgp_endpoint_out = dbgp_desc.bDebugOutEndpoint; |
4fe1da4e | 567 | dbgp_endpoint_in = dbgp_desc.bDebugInEndpoint; |
91777826 JW |
568 | |
569 | /* Move the device to 127 if it isn't already there */ | |
570 | if (devnum != USB_DEBUG_DEVNUM) { | |
571 | ret = dbgp_control_msg(devnum, | |
572 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
573 | USB_REQ_SET_ADDRESS, USB_DEBUG_DEVNUM, 0, NULL, 0); | |
574 | if (ret < 0) { | |
575 | dbgp_printk("Could not move attached device to %d\n", | |
576 | USB_DEBUG_DEVNUM); | |
577 | goto err; | |
578 | } | |
91777826 JW |
579 | dbgp_printk("debug device renamed to 127\n"); |
580 | } | |
581 | ||
582 | /* Enable the debug interface */ | |
583 | ret = dbgp_control_msg(USB_DEBUG_DEVNUM, | |
584 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
585 | USB_REQ_SET_FEATURE, USB_DEVICE_DEBUG_MODE, 0, NULL, 0); | |
586 | if (ret < 0) { | |
587 | dbgp_printk(" Could not enable the debug device\n"); | |
588 | goto err; | |
589 | } | |
590 | dbgp_printk("debug interface enabled\n"); | |
591 | /* Perform a small write to get the even/odd data state in sync | |
592 | */ | |
593 | ret = dbgp_bulk_write(USB_DEBUG_DEVNUM, dbgp_endpoint_out, " ", 1); | |
594 | if (ret < 0) { | |
595 | dbgp_printk("dbgp_bulk_write failed: %d\n", ret); | |
596 | goto err; | |
597 | } | |
ef58d97a | 598 | dbgp_printk("small write done\n"); |
91777826 JW |
599 | dbgp_not_safe = 0; |
600 | ||
601 | return 0; | |
602 | err: | |
603 | if (tries--) | |
604 | goto try_again; | |
605 | return -ENODEV; | |
606 | } | |
9fa5780b | 607 | |
40b52371 | 608 | static int ehci_reset_port(int port) |
df6c5169 JW |
609 | { |
610 | u32 portsc; | |
611 | u32 delay_time, delay; | |
612 | int loop; | |
613 | ||
91777826 | 614 | dbgp_ehci_status("reset port"); |
df6c5169 JW |
615 | /* Reset the usb debug port */ |
616 | portsc = readl(&ehci_regs->port_status[port - 1]); | |
617 | portsc &= ~PORT_PE; | |
618 | portsc |= PORT_RESET; | |
619 | writel(portsc, &ehci_regs->port_status[port - 1]); | |
620 | ||
621 | delay = HUB_ROOT_RESET_TIME; | |
622 | for (delay_time = 0; delay_time < HUB_RESET_TIMEOUT; | |
623 | delay_time += delay) { | |
624 | dbgp_mdelay(delay); | |
df6c5169 | 625 | portsc = readl(&ehci_regs->port_status[port - 1]); |
56faf0f9 JW |
626 | if (!(portsc & PORT_RESET)) |
627 | break; | |
628 | } | |
f4b614ad CIK |
629 | if (portsc & PORT_RESET) { |
630 | /* force reset to complete */ | |
631 | loop = 100 * 1000; | |
632 | writel(portsc & ~(PORT_RWC_BITS | PORT_RESET), | |
633 | &ehci_regs->port_status[port - 1]); | |
634 | do { | |
635 | udelay(1); | |
636 | portsc = readl(&ehci_regs->port_status[port-1]); | |
637 | } while ((portsc & PORT_RESET) && (--loop > 0)); | |
638 | } | |
df6c5169 | 639 | |
f4b614ad CIK |
640 | /* Device went away? */ |
641 | if (!(portsc & PORT_CONNECT)) | |
642 | return -ENOTCONN; | |
df6c5169 | 643 | |
f4b614ad CIK |
644 | /* bomb out completely if something weird happened */ |
645 | if ((portsc & PORT_CSC)) | |
646 | return -EINVAL; | |
df6c5169 | 647 | |
f4b614ad CIK |
648 | /* If we've finished resetting, then break out of the loop */ |
649 | if (!(portsc & PORT_RESET) && (portsc & PORT_PE)) | |
650 | return 0; | |
df6c5169 JW |
651 | return -EBUSY; |
652 | } | |
653 | ||
91777826 | 654 | static int ehci_wait_for_port(int port) |
df6c5169 JW |
655 | { |
656 | u32 status; | |
657 | int ret, reps; | |
658 | ||
56faf0f9 | 659 | for (reps = 0; reps < 300; reps++) { |
df6c5169 | 660 | status = readl(&ehci_regs->status); |
56faf0f9 JW |
661 | if (status & STS_PCD) |
662 | break; | |
663 | dbgp_mdelay(1); | |
df6c5169 | 664 | } |
56faf0f9 JW |
665 | ret = ehci_reset_port(port); |
666 | if (ret == 0) | |
667 | return 0; | |
df6c5169 JW |
668 | return -ENOTCONN; |
669 | } | |
670 | ||
df6c5169 JW |
671 | typedef void (*set_debug_port_t)(int port); |
672 | ||
673 | static void __init default_set_debug_port(int port) | |
674 | { | |
675 | } | |
676 | ||
677 | static set_debug_port_t __initdata set_debug_port = default_set_debug_port; | |
678 | ||
679 | static void __init nvidia_set_debug_port(int port) | |
680 | { | |
681 | u32 dword; | |
682 | dword = read_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, | |
683 | 0x74); | |
684 | dword &= ~(0x0f<<12); | |
685 | dword |= ((port & 0x0f)<<12); | |
686 | write_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, 0x74, | |
687 | dword); | |
688 | dbgp_printk("set debug port to %d\n", port); | |
689 | } | |
690 | ||
691 | static void __init detect_set_debug_port(void) | |
692 | { | |
693 | u32 vendorid; | |
694 | ||
695 | vendorid = read_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, | |
696 | 0x00); | |
697 | ||
698 | if ((vendorid & 0xffff) == 0x10de) { | |
699 | dbgp_printk("using nvidia set_debug_port\n"); | |
700 | set_debug_port = nvidia_set_debug_port; | |
701 | } | |
702 | } | |
703 | ||
093344e1 JW |
704 | /* The code in early_ehci_bios_handoff() is derived from the usb pci |
705 | * quirk initialization, but altered so as to use the early PCI | |
706 | * routines. */ | |
707 | #define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */ | |
708 | #define EHCI_USBLEGCTLSTS 4 /* legacy control/status */ | |
709 | static void __init early_ehci_bios_handoff(void) | |
710 | { | |
711 | u32 hcc_params = readl(&ehci_caps->hcc_params); | |
712 | int offset = (hcc_params >> 8) & 0xff; | |
713 | u32 cap; | |
714 | int msec; | |
715 | ||
716 | if (!offset) | |
717 | return; | |
718 | ||
719 | cap = read_pci_config(ehci_dev.bus, ehci_dev.slot, | |
720 | ehci_dev.func, offset); | |
721 | dbgp_printk("dbgp: ehci BIOS state %08x\n", cap); | |
722 | ||
723 | if ((cap & 0xff) == 1 && (cap & EHCI_USBLEGSUP_BIOS)) { | |
724 | dbgp_printk("dbgp: BIOS handoff\n"); | |
725 | write_pci_config_byte(ehci_dev.bus, ehci_dev.slot, | |
726 | ehci_dev.func, offset + 3, 1); | |
727 | } | |
728 | ||
729 | /* if boot firmware now owns EHCI, spin till it hands it over. */ | |
730 | msec = 1000; | |
731 | while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) { | |
732 | mdelay(10); | |
733 | msec -= 10; | |
734 | cap = read_pci_config(ehci_dev.bus, ehci_dev.slot, | |
735 | ehci_dev.func, offset); | |
736 | } | |
737 | ||
738 | if (cap & EHCI_USBLEGSUP_BIOS) { | |
739 | /* well, possibly buggy BIOS... try to shut it down, | |
740 | * and hope nothing goes too wrong */ | |
741 | dbgp_printk("dbgp: BIOS handoff failed: %08x\n", cap); | |
742 | write_pci_config_byte(ehci_dev.bus, ehci_dev.slot, | |
743 | ehci_dev.func, offset + 2, 0); | |
744 | } | |
745 | ||
746 | /* just in case, always disable EHCI SMIs */ | |
747 | write_pci_config_byte(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, | |
748 | offset + EHCI_USBLEGCTLSTS, 0); | |
749 | } | |
750 | ||
df6c5169 JW |
751 | static int __init ehci_setup(void) |
752 | { | |
91777826 | 753 | u32 ctrl, portsc, hcs_params; |
df6c5169 | 754 | u32 debug_port, new_debug_port = 0, n_ports; |
df6c5169 | 755 | int ret, i; |
df6c5169 JW |
756 | int port_map_tried; |
757 | int playtimes = 3; | |
758 | ||
093344e1 JW |
759 | early_ehci_bios_handoff(); |
760 | ||
df6c5169 JW |
761 | try_next_time: |
762 | port_map_tried = 0; | |
763 | ||
764 | try_next_port: | |
765 | ||
766 | hcs_params = readl(&ehci_caps->hcs_params); | |
767 | debug_port = HCS_DEBUG_PORT(hcs_params); | |
91777826 | 768 | dbgp_phys_port = debug_port; |
df6c5169 JW |
769 | n_ports = HCS_N_PORTS(hcs_params); |
770 | ||
771 | dbgp_printk("debug_port: %d\n", debug_port); | |
772 | dbgp_printk("n_ports: %d\n", n_ports); | |
91777826 | 773 | dbgp_ehci_status(""); |
df6c5169 JW |
774 | |
775 | for (i = 1; i <= n_ports; i++) { | |
776 | portsc = readl(&ehci_regs->port_status[i-1]); | |
777 | dbgp_printk("portstatus%d: %08x\n", i, portsc); | |
778 | } | |
779 | ||
780 | if (port_map_tried && (new_debug_port != debug_port)) { | |
781 | if (--playtimes) { | |
782 | set_debug_port(new_debug_port); | |
783 | goto try_next_time; | |
784 | } | |
785 | return -1; | |
786 | } | |
787 | ||
91777826 JW |
788 | /* Only reset the controller if it is not already in the |
789 | * configured state */ | |
790 | if (!(readl(&ehci_regs->configured_flag) & FLAG_CF)) { | |
791 | if (dbgp_ehci_controller_reset() != 0) | |
792 | return -1; | |
793 | } else { | |
794 | dbgp_ehci_status("ehci skip - already configured"); | |
df6c5169 | 795 | } |
df6c5169 | 796 | |
9fa5780b | 797 | ret = _dbgp_external_startup(); |
91777826 | 798 | if (ret == -EIO) |
df6c5169 | 799 | goto next_debug_port; |
df6c5169 | 800 | |
df6c5169 | 801 | if (ret < 0) { |
91777826 JW |
802 | /* Things didn't work so remove my claim */ |
803 | ctrl = readl(&ehci_debug->control); | |
804 | ctrl &= ~(DBGP_CLAIM | DBGP_OUT); | |
805 | writel(ctrl, &ehci_debug->control); | |
806 | return -1; | |
df6c5169 | 807 | } |
df6c5169 | 808 | return 0; |
df6c5169 JW |
809 | |
810 | next_debug_port: | |
811 | port_map_tried |= (1<<(debug_port - 1)); | |
812 | new_debug_port = ((debug_port-1+1)%n_ports) + 1; | |
813 | if (port_map_tried != ((1<<n_ports) - 1)) { | |
814 | set_debug_port(new_debug_port); | |
815 | goto try_next_port; | |
816 | } | |
817 | if (--playtimes) { | |
818 | set_debug_port(new_debug_port); | |
819 | goto try_next_time; | |
820 | } | |
821 | ||
822 | return -1; | |
823 | } | |
824 | ||
825 | int __init early_dbgp_init(char *s) | |
826 | { | |
827 | u32 debug_port, bar, offset; | |
828 | u32 bus, slot, func, cap; | |
829 | void __iomem *ehci_bar; | |
830 | u32 dbgp_num; | |
831 | u32 bar_val; | |
832 | char *e; | |
833 | int ret; | |
834 | u8 byte; | |
835 | ||
836 | if (!early_pci_allowed()) | |
837 | return -1; | |
838 | ||
839 | dbgp_num = 0; | |
840 | if (*s) | |
841 | dbgp_num = simple_strtoul(s, &e, 10); | |
842 | dbgp_printk("dbgp_num: %d\n", dbgp_num); | |
843 | ||
844 | cap = find_dbgp(dbgp_num, &bus, &slot, &func); | |
845 | if (!cap) | |
846 | return -1; | |
847 | ||
848 | dbgp_printk("Found EHCI debug port on %02x:%02x.%1x\n", bus, slot, | |
849 | func); | |
850 | ||
851 | debug_port = read_pci_config(bus, slot, func, cap); | |
852 | bar = (debug_port >> 29) & 0x7; | |
853 | bar = (bar * 4) + 0xc; | |
854 | offset = (debug_port >> 16) & 0xfff; | |
855 | dbgp_printk("bar: %02x offset: %03x\n", bar, offset); | |
856 | if (bar != PCI_BASE_ADDRESS_0) { | |
857 | dbgp_printk("only debug ports on bar 1 handled.\n"); | |
858 | ||
859 | return -1; | |
860 | } | |
861 | ||
862 | bar_val = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0); | |
863 | dbgp_printk("bar_val: %02x offset: %03x\n", bar_val, offset); | |
864 | if (bar_val & ~PCI_BASE_ADDRESS_MEM_MASK) { | |
865 | dbgp_printk("only simple 32bit mmio bars supported\n"); | |
866 | ||
867 | return -1; | |
868 | } | |
869 | ||
870 | /* double check if the mem space is enabled */ | |
871 | byte = read_pci_config_byte(bus, slot, func, 0x04); | |
872 | if (!(byte & 0x2)) { | |
873 | byte |= 0x02; | |
874 | write_pci_config_byte(bus, slot, func, 0x04, byte); | |
875 | dbgp_printk("mmio for ehci enabled\n"); | |
876 | } | |
877 | ||
878 | /* | |
879 | * FIXME I don't have the bar size so just guess PAGE_SIZE is more | |
880 | * than enough. 1K is the biggest I have seen. | |
881 | */ | |
882 | set_fixmap_nocache(FIX_DBGP_BASE, bar_val & PAGE_MASK); | |
883 | ehci_bar = (void __iomem *)__fix_to_virt(FIX_DBGP_BASE); | |
884 | ehci_bar += bar_val & ~PAGE_MASK; | |
885 | dbgp_printk("ehci_bar: %p\n", ehci_bar); | |
886 | ||
887 | ehci_caps = ehci_bar; | |
c430131a | 888 | ehci_regs = ehci_bar + EARLY_HC_LENGTH(readl(&ehci_caps->hc_capbase)); |
df6c5169 JW |
889 | ehci_debug = ehci_bar + offset; |
890 | ehci_dev.bus = bus; | |
891 | ehci_dev.slot = slot; | |
892 | ehci_dev.func = func; | |
893 | ||
894 | detect_set_debug_port(); | |
895 | ||
896 | ret = ehci_setup(); | |
897 | if (ret < 0) { | |
898 | dbgp_printk("ehci_setup failed\n"); | |
899 | ehci_debug = NULL; | |
900 | ||
901 | return -1; | |
902 | } | |
91777826 | 903 | dbgp_ehci_status("early_init_complete"); |
df6c5169 JW |
904 | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static void early_dbgp_write(struct console *con, const char *str, u32 n) | |
909 | { | |
beb368a4 | 910 | int chunk; |
87a5d151 JW |
911 | char buf[DBGP_MAX_PACKET]; |
912 | int use_cr = 0; | |
91777826 JW |
913 | u32 cmd, ctrl; |
914 | int reset_run = 0; | |
df6c5169 | 915 | |
91777826 | 916 | if (!ehci_debug || dbgp_not_safe) |
df6c5169 | 917 | return; |
91777826 JW |
918 | |
919 | cmd = readl(&ehci_regs->command); | |
920 | if (unlikely(!(cmd & CMD_RUN))) { | |
921 | /* If the ehci controller is not in the run state do extended | |
922 | * checks to see if the acpi or some other initialization also | |
923 | * reset the ehci debug port */ | |
924 | ctrl = readl(&ehci_debug->control); | |
925 | if (!(ctrl & DBGP_ENABLED)) { | |
926 | dbgp_not_safe = 1; | |
9fa5780b | 927 | _dbgp_external_startup(); |
91777826 JW |
928 | } else { |
929 | cmd |= CMD_RUN; | |
930 | writel(cmd, &ehci_regs->command); | |
931 | reset_run = 1; | |
932 | } | |
933 | } | |
df6c5169 | 934 | while (n > 0) { |
87a5d151 JW |
935 | for (chunk = 0; chunk < DBGP_MAX_PACKET && n > 0; |
936 | str++, chunk++, n--) { | |
937 | if (!use_cr && *str == '\n') { | |
938 | use_cr = 1; | |
939 | buf[chunk] = '\r'; | |
940 | str--; | |
941 | n++; | |
942 | continue; | |
943 | } | |
944 | if (use_cr) | |
945 | use_cr = 0; | |
946 | buf[chunk] = *str; | |
947 | } | |
91777826 | 948 | if (chunk > 0) { |
beb368a4 LJ |
949 | dbgp_bulk_write(USB_DEBUG_DEVNUM, |
950 | dbgp_endpoint_out, buf, chunk); | |
91777826 JW |
951 | } |
952 | } | |
953 | if (unlikely(reset_run)) { | |
954 | cmd = readl(&ehci_regs->command); | |
955 | cmd &= ~CMD_RUN; | |
956 | writel(cmd, &ehci_regs->command); | |
df6c5169 JW |
957 | } |
958 | } | |
959 | ||
960 | struct console early_dbgp_console = { | |
961 | .name = "earlydbg", | |
962 | .write = early_dbgp_write, | |
963 | .flags = CON_PRINTBUFFER, | |
964 | .index = -1, | |
965 | }; | |
8d053c79 | 966 | |
bc8d51ea | 967 | #if IS_ENABLED(CONFIG_USB) |
9fa5780b | 968 | int dbgp_reset_prep(struct usb_hcd *hcd) |
8d053c79 | 969 | { |
9fa5780b | 970 | int ret = xen_dbgp_reset_prep(hcd); |
8d053c79 JW |
971 | u32 ctrl; |
972 | ||
9fa5780b JB |
973 | if (ret) |
974 | return ret; | |
975 | ||
8d053c79 JW |
976 | dbgp_not_safe = 1; |
977 | if (!ehci_debug) | |
978 | return 0; | |
979 | ||
4fe1da4e JW |
980 | if ((early_dbgp_console.index != -1 && |
981 | !(early_dbgp_console.flags & CON_BOOT)) || | |
982 | dbgp_kgdb_mode) | |
8d053c79 JW |
983 | return 1; |
984 | /* This means the console is not initialized, or should get | |
985 | * shutdown so as to allow for reuse of the usb device, which | |
986 | * means it is time to shutdown the usb debug port. */ | |
987 | ctrl = readl(&ehci_debug->control); | |
988 | if (ctrl & DBGP_ENABLED) { | |
989 | ctrl &= ~(DBGP_CLAIM); | |
990 | writel(ctrl, &ehci_debug->control); | |
991 | } | |
992 | return 0; | |
993 | } | |
994 | EXPORT_SYMBOL_GPL(dbgp_reset_prep); | |
4fe1da4e | 995 | |
86effe59 JB |
996 | int dbgp_external_startup(struct usb_hcd *hcd) |
997 | { | |
998 | return xen_dbgp_external_startup(hcd) ?: _dbgp_external_startup(); | |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(dbgp_external_startup); | |
bc8d51ea | 1001 | #endif /* USB */ |
86effe59 | 1002 | |
4fe1da4e JW |
1003 | #ifdef CONFIG_KGDB |
1004 | ||
1005 | static char kgdbdbgp_buf[DBGP_MAX_PACKET]; | |
1006 | static int kgdbdbgp_buf_sz; | |
1007 | static int kgdbdbgp_buf_idx; | |
1008 | static int kgdbdbgp_loop_cnt = DBGP_LOOPS; | |
1009 | ||
1010 | static int kgdbdbgp_read_char(void) | |
1011 | { | |
1012 | int ret; | |
1013 | ||
1014 | if (kgdbdbgp_buf_idx < kgdbdbgp_buf_sz) { | |
1015 | char ch = kgdbdbgp_buf[kgdbdbgp_buf_idx++]; | |
1016 | return ch; | |
1017 | } | |
1018 | ||
1019 | ret = dbgp_bulk_read(USB_DEBUG_DEVNUM, dbgp_endpoint_in, | |
1020 | &kgdbdbgp_buf, DBGP_MAX_PACKET, | |
1021 | kgdbdbgp_loop_cnt); | |
1022 | if (ret <= 0) | |
1023 | return NO_POLL_CHAR; | |
1024 | kgdbdbgp_buf_sz = ret; | |
1025 | kgdbdbgp_buf_idx = 1; | |
1026 | return kgdbdbgp_buf[0]; | |
1027 | } | |
1028 | ||
1029 | static void kgdbdbgp_write_char(u8 chr) | |
1030 | { | |
1031 | early_dbgp_write(NULL, &chr, 1); | |
1032 | } | |
1033 | ||
1034 | static struct kgdb_io kgdbdbgp_io_ops = { | |
1035 | .name = "kgdbdbgp", | |
1036 | .read_char = kgdbdbgp_read_char, | |
1037 | .write_char = kgdbdbgp_write_char, | |
1038 | }; | |
1039 | ||
1040 | static int kgdbdbgp_wait_time; | |
1041 | ||
1042 | static int __init kgdbdbgp_parse_config(char *str) | |
1043 | { | |
1044 | char *ptr; | |
1045 | ||
1046 | if (!ehci_debug) { | |
1047 | if (early_dbgp_init(str)) | |
1048 | return -1; | |
1049 | } | |
1050 | ptr = strchr(str, ','); | |
1051 | if (ptr) { | |
1052 | ptr++; | |
1053 | kgdbdbgp_wait_time = simple_strtoul(ptr, &ptr, 10); | |
1054 | } | |
1055 | kgdb_register_io_module(&kgdbdbgp_io_ops); | |
5946d1f5 SG |
1056 | if (early_dbgp_console.index != -1) |
1057 | kgdbdbgp_io_ops.cons = &early_dbgp_console; | |
4fe1da4e JW |
1058 | |
1059 | return 0; | |
1060 | } | |
1061 | early_param("kgdbdbgp", kgdbdbgp_parse_config); | |
1062 | ||
1063 | static int kgdbdbgp_reader_thread(void *ptr) | |
1064 | { | |
1065 | int ret; | |
1066 | ||
1067 | while (readl(&ehci_debug->control) & DBGP_ENABLED) { | |
1068 | kgdbdbgp_loop_cnt = 1; | |
1069 | ret = kgdbdbgp_read_char(); | |
1070 | kgdbdbgp_loop_cnt = DBGP_LOOPS; | |
1071 | if (ret != NO_POLL_CHAR) { | |
1072 | if (ret == 0x3 || ret == '$') { | |
1073 | if (ret == '$') | |
1074 | kgdbdbgp_buf_idx--; | |
1075 | kgdb_breakpoint(); | |
1076 | } | |
1077 | continue; | |
1078 | } | |
1079 | schedule_timeout_interruptible(kgdbdbgp_wait_time * HZ); | |
1080 | } | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | static int __init kgdbdbgp_start_thread(void) | |
1085 | { | |
1086 | if (dbgp_kgdb_mode && kgdbdbgp_wait_time) | |
1087 | kthread_run(kgdbdbgp_reader_thread, NULL, "%s", "dbgp"); | |
1088 | ||
1089 | return 0; | |
1090 | } | |
4e84e221 | 1091 | device_initcall(kgdbdbgp_start_thread); |
4fe1da4e | 1092 | #endif /* CONFIG_KGDB */ |