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usb: dwc3: remove our homebrew state mechanism
[linux-2.6-block.git] / drivers / usb / dwc3 / debugfs.c
CommitLineData
72246da4
FB		 1/**
2 * debugfs.c - DesignWare USB3 DRD Controller DebugFS file
3 *
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
72246da4
FB		 5 *
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions, and the following disclaimer,
14 * without modification.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The names of the above-listed copyright holders may not be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
21 *
22 * ALTERNATIVELY, this software may be distributed under the terms of the
23 * GNU General Public License ("GPL") version 2, as published by the Free
24 * Software Foundation.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
28 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
30 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <linux/kernel.h>
40#include <linux/slab.h>
41#include <linux/ptrace.h>
42#include <linux/types.h>
43#include <linux/spinlock.h>
44#include <linux/debugfs.h>
45#include <linux/seq_file.h>
46#include <linux/delay.h>
25b8ff68 47#include <linux/uaccess.h>
72246da4 48
080d921f
FB		 49#include <linux/usb/ch9.h>
50
72246da4
FB		 51#include "core.h"
52#include "gadget.h"
53#include "io.h"
8becf270 54#include "debug.h"
72246da4 55
72246da4
FB		 56#define dump_register(nm) \
57{ \
58 .name = __stringify(nm), \
1604c1e7 59 .offset = DWC3_ ##nm - DWC3_GLOBALS_REGS_START, \
72246da4
FB		 60}
61
d7668024 62static struct debugfs_reg32 dwc3_regs[] = {
72246da4
FB		 63 dump_register(GSBUSCFG0),
64 dump_register(GSBUSCFG1),
65 dump_register(GTXTHRCFG),
66 dump_register(GRXTHRCFG),
67 dump_register(GCTL),
68 dump_register(GEVTEN),
69 dump_register(GSTS),
70 dump_register(GSNPSID),
71 dump_register(GGPIO),
72 dump_register(GUID),
73 dump_register(GUCTL),
74 dump_register(GBUSERRADDR0),
75 dump_register(GBUSERRADDR1),
76 dump_register(GPRTBIMAP0),
77 dump_register(GPRTBIMAP1),
78 dump_register(GHWPARAMS0),
79 dump_register(GHWPARAMS1),
80 dump_register(GHWPARAMS2),
81 dump_register(GHWPARAMS3),
82 dump_register(GHWPARAMS4),
83 dump_register(GHWPARAMS5),
84 dump_register(GHWPARAMS6),
85 dump_register(GHWPARAMS7),
86 dump_register(GDBGFIFOSPACE),
87 dump_register(GDBGLTSSM),
88 dump_register(GPRTBIMAP_HS0),
89 dump_register(GPRTBIMAP_HS1),
90 dump_register(GPRTBIMAP_FS0),
91 dump_register(GPRTBIMAP_FS1),
92
93 dump_register(GUSB2PHYCFG(0)),
94 dump_register(GUSB2PHYCFG(1)),
95 dump_register(GUSB2PHYCFG(2)),
96 dump_register(GUSB2PHYCFG(3)),
97 dump_register(GUSB2PHYCFG(4)),
98 dump_register(GUSB2PHYCFG(5)),
99 dump_register(GUSB2PHYCFG(6)),
100 dump_register(GUSB2PHYCFG(7)),
101 dump_register(GUSB2PHYCFG(8)),
102 dump_register(GUSB2PHYCFG(9)),
103 dump_register(GUSB2PHYCFG(10)),
104 dump_register(GUSB2PHYCFG(11)),
105 dump_register(GUSB2PHYCFG(12)),
106 dump_register(GUSB2PHYCFG(13)),
107 dump_register(GUSB2PHYCFG(14)),
108 dump_register(GUSB2PHYCFG(15)),
109
110 dump_register(GUSB2I2CCTL(0)),
111 dump_register(GUSB2I2CCTL(1)),
112 dump_register(GUSB2I2CCTL(2)),
113 dump_register(GUSB2I2CCTL(3)),
114 dump_register(GUSB2I2CCTL(4)),
115 dump_register(GUSB2I2CCTL(5)),
116 dump_register(GUSB2I2CCTL(6)),
117 dump_register(GUSB2I2CCTL(7)),
118 dump_register(GUSB2I2CCTL(8)),
119 dump_register(GUSB2I2CCTL(9)),
120 dump_register(GUSB2I2CCTL(10)),
121 dump_register(GUSB2I2CCTL(11)),
122 dump_register(GUSB2I2CCTL(12)),
123 dump_register(GUSB2I2CCTL(13)),
124 dump_register(GUSB2I2CCTL(14)),
125 dump_register(GUSB2I2CCTL(15)),
126
127 dump_register(GUSB2PHYACC(0)),
128 dump_register(GUSB2PHYACC(1)),
129 dump_register(GUSB2PHYACC(2)),
130 dump_register(GUSB2PHYACC(3)),
131 dump_register(GUSB2PHYACC(4)),
132 dump_register(GUSB2PHYACC(5)),
133 dump_register(GUSB2PHYACC(6)),
134 dump_register(GUSB2PHYACC(7)),
135 dump_register(GUSB2PHYACC(8)),
136 dump_register(GUSB2PHYACC(9)),
137 dump_register(GUSB2PHYACC(10)),
138 dump_register(GUSB2PHYACC(11)),
139 dump_register(GUSB2PHYACC(12)),
140 dump_register(GUSB2PHYACC(13)),
141 dump_register(GUSB2PHYACC(14)),
142 dump_register(GUSB2PHYACC(15)),
143
144 dump_register(GUSB3PIPECTL(0)),
145 dump_register(GUSB3PIPECTL(1)),
146 dump_register(GUSB3PIPECTL(2)),
147 dump_register(GUSB3PIPECTL(3)),
148 dump_register(GUSB3PIPECTL(4)),
149 dump_register(GUSB3PIPECTL(5)),
150 dump_register(GUSB3PIPECTL(6)),
151 dump_register(GUSB3PIPECTL(7)),
152 dump_register(GUSB3PIPECTL(8)),
153 dump_register(GUSB3PIPECTL(9)),
154 dump_register(GUSB3PIPECTL(10)),
155 dump_register(GUSB3PIPECTL(11)),
156 dump_register(GUSB3PIPECTL(12)),
157 dump_register(GUSB3PIPECTL(13)),
158 dump_register(GUSB3PIPECTL(14)),
159 dump_register(GUSB3PIPECTL(15)),
160
161 dump_register(GTXFIFOSIZ(0)),
162 dump_register(GTXFIFOSIZ(1)),
163 dump_register(GTXFIFOSIZ(2)),
164 dump_register(GTXFIFOSIZ(3)),
165 dump_register(GTXFIFOSIZ(4)),
166 dump_register(GTXFIFOSIZ(5)),
167 dump_register(GTXFIFOSIZ(6)),
168 dump_register(GTXFIFOSIZ(7)),
169 dump_register(GTXFIFOSIZ(8)),
170 dump_register(GTXFIFOSIZ(9)),
171 dump_register(GTXFIFOSIZ(10)),
172 dump_register(GTXFIFOSIZ(11)),
173 dump_register(GTXFIFOSIZ(12)),
174 dump_register(GTXFIFOSIZ(13)),
175 dump_register(GTXFIFOSIZ(14)),
176 dump_register(GTXFIFOSIZ(15)),
177 dump_register(GTXFIFOSIZ(16)),
178 dump_register(GTXFIFOSIZ(17)),
179 dump_register(GTXFIFOSIZ(18)),
180 dump_register(GTXFIFOSIZ(19)),
181 dump_register(GTXFIFOSIZ(20)),
182 dump_register(GTXFIFOSIZ(21)),
183 dump_register(GTXFIFOSIZ(22)),
184 dump_register(GTXFIFOSIZ(23)),
185 dump_register(GTXFIFOSIZ(24)),
186 dump_register(GTXFIFOSIZ(25)),
187 dump_register(GTXFIFOSIZ(26)),
188 dump_register(GTXFIFOSIZ(27)),
189 dump_register(GTXFIFOSIZ(28)),
190 dump_register(GTXFIFOSIZ(29)),
191 dump_register(GTXFIFOSIZ(30)),
192 dump_register(GTXFIFOSIZ(31)),
193
194 dump_register(GRXFIFOSIZ(0)),
195 dump_register(GRXFIFOSIZ(1)),
196 dump_register(GRXFIFOSIZ(2)),
197 dump_register(GRXFIFOSIZ(3)),
198 dump_register(GRXFIFOSIZ(4)),
199 dump_register(GRXFIFOSIZ(5)),
200 dump_register(GRXFIFOSIZ(6)),
201 dump_register(GRXFIFOSIZ(7)),
202 dump_register(GRXFIFOSIZ(8)),
203 dump_register(GRXFIFOSIZ(9)),
204 dump_register(GRXFIFOSIZ(10)),
205 dump_register(GRXFIFOSIZ(11)),
206 dump_register(GRXFIFOSIZ(12)),
207 dump_register(GRXFIFOSIZ(13)),
208 dump_register(GRXFIFOSIZ(14)),
209 dump_register(GRXFIFOSIZ(15)),
210 dump_register(GRXFIFOSIZ(16)),
211 dump_register(GRXFIFOSIZ(17)),
212 dump_register(GRXFIFOSIZ(18)),
213 dump_register(GRXFIFOSIZ(19)),
214 dump_register(GRXFIFOSIZ(20)),
215 dump_register(GRXFIFOSIZ(21)),
216 dump_register(GRXFIFOSIZ(22)),
217 dump_register(GRXFIFOSIZ(23)),
218 dump_register(GRXFIFOSIZ(24)),
219 dump_register(GRXFIFOSIZ(25)),
220 dump_register(GRXFIFOSIZ(26)),
221 dump_register(GRXFIFOSIZ(27)),
222 dump_register(GRXFIFOSIZ(28)),
223 dump_register(GRXFIFOSIZ(29)),
224 dump_register(GRXFIFOSIZ(30)),
225 dump_register(GRXFIFOSIZ(31)),
226
227 dump_register(GEVNTADRLO(0)),
228 dump_register(GEVNTADRHI(0)),
229 dump_register(GEVNTSIZ(0)),
230 dump_register(GEVNTCOUNT(0)),
231
232 dump_register(GHWPARAMS8),
233 dump_register(DCFG),
234 dump_register(DCTL),
235 dump_register(DEVTEN),
236 dump_register(DSTS),
237 dump_register(DGCMDPAR),
238 dump_register(DGCMD),
239 dump_register(DALEPENA),
240
241 dump_register(DEPCMDPAR2(0)),
242 dump_register(DEPCMDPAR2(1)),
243 dump_register(DEPCMDPAR2(2)),
244 dump_register(DEPCMDPAR2(3)),
245 dump_register(DEPCMDPAR2(4)),
246 dump_register(DEPCMDPAR2(5)),
247 dump_register(DEPCMDPAR2(6)),
248 dump_register(DEPCMDPAR2(7)),
249 dump_register(DEPCMDPAR2(8)),
250 dump_register(DEPCMDPAR2(9)),
251 dump_register(DEPCMDPAR2(10)),
252 dump_register(DEPCMDPAR2(11)),
253 dump_register(DEPCMDPAR2(12)),
254 dump_register(DEPCMDPAR2(13)),
255 dump_register(DEPCMDPAR2(14)),
256 dump_register(DEPCMDPAR2(15)),
257 dump_register(DEPCMDPAR2(16)),
258 dump_register(DEPCMDPAR2(17)),
259 dump_register(DEPCMDPAR2(18)),
260 dump_register(DEPCMDPAR2(19)),
261 dump_register(DEPCMDPAR2(20)),
262 dump_register(DEPCMDPAR2(21)),
263 dump_register(DEPCMDPAR2(22)),
264 dump_register(DEPCMDPAR2(23)),
265 dump_register(DEPCMDPAR2(24)),
266 dump_register(DEPCMDPAR2(25)),
267 dump_register(DEPCMDPAR2(26)),
268 dump_register(DEPCMDPAR2(27)),
269 dump_register(DEPCMDPAR2(28)),
270 dump_register(DEPCMDPAR2(29)),
271 dump_register(DEPCMDPAR2(30)),
272 dump_register(DEPCMDPAR2(31)),
273
274 dump_register(DEPCMDPAR1(0)),
275 dump_register(DEPCMDPAR1(1)),
276 dump_register(DEPCMDPAR1(2)),
277 dump_register(DEPCMDPAR1(3)),
278 dump_register(DEPCMDPAR1(4)),
279 dump_register(DEPCMDPAR1(5)),
280 dump_register(DEPCMDPAR1(6)),
281 dump_register(DEPCMDPAR1(7)),
282 dump_register(DEPCMDPAR1(8)),
283 dump_register(DEPCMDPAR1(9)),
284 dump_register(DEPCMDPAR1(10)),
285 dump_register(DEPCMDPAR1(11)),
286 dump_register(DEPCMDPAR1(12)),
287 dump_register(DEPCMDPAR1(13)),
288 dump_register(DEPCMDPAR1(14)),
289 dump_register(DEPCMDPAR1(15)),
290 dump_register(DEPCMDPAR1(16)),
291 dump_register(DEPCMDPAR1(17)),
292 dump_register(DEPCMDPAR1(18)),
293 dump_register(DEPCMDPAR1(19)),
294 dump_register(DEPCMDPAR1(20)),
295 dump_register(DEPCMDPAR1(21)),
296 dump_register(DEPCMDPAR1(22)),
297 dump_register(DEPCMDPAR1(23)),
298 dump_register(DEPCMDPAR1(24)),
299 dump_register(DEPCMDPAR1(25)),
300 dump_register(DEPCMDPAR1(26)),
301 dump_register(DEPCMDPAR1(27)),
302 dump_register(DEPCMDPAR1(28)),
303 dump_register(DEPCMDPAR1(29)),
304 dump_register(DEPCMDPAR1(30)),
305 dump_register(DEPCMDPAR1(31)),
306
307 dump_register(DEPCMDPAR0(0)),
308 dump_register(DEPCMDPAR0(1)),
309 dump_register(DEPCMDPAR0(2)),
310 dump_register(DEPCMDPAR0(3)),
311 dump_register(DEPCMDPAR0(4)),
312 dump_register(DEPCMDPAR0(5)),
313 dump_register(DEPCMDPAR0(6)),
314 dump_register(DEPCMDPAR0(7)),
315 dump_register(DEPCMDPAR0(8)),
316 dump_register(DEPCMDPAR0(9)),
317 dump_register(DEPCMDPAR0(10)),
318 dump_register(DEPCMDPAR0(11)),
319 dump_register(DEPCMDPAR0(12)),
320 dump_register(DEPCMDPAR0(13)),
321 dump_register(DEPCMDPAR0(14)),
322 dump_register(DEPCMDPAR0(15)),
323 dump_register(DEPCMDPAR0(16)),
324 dump_register(DEPCMDPAR0(17)),
325 dump_register(DEPCMDPAR0(18)),
326 dump_register(DEPCMDPAR0(19)),
327 dump_register(DEPCMDPAR0(20)),
328 dump_register(DEPCMDPAR0(21)),
329 dump_register(DEPCMDPAR0(22)),
330 dump_register(DEPCMDPAR0(23)),
331 dump_register(DEPCMDPAR0(24)),
332 dump_register(DEPCMDPAR0(25)),
333 dump_register(DEPCMDPAR0(26)),
334 dump_register(DEPCMDPAR0(27)),
335 dump_register(DEPCMDPAR0(28)),
336 dump_register(DEPCMDPAR0(29)),
337 dump_register(DEPCMDPAR0(30)),
338 dump_register(DEPCMDPAR0(31)),
339
340 dump_register(DEPCMD(0)),
341 dump_register(DEPCMD(1)),
342 dump_register(DEPCMD(2)),
343 dump_register(DEPCMD(3)),
344 dump_register(DEPCMD(4)),
345 dump_register(DEPCMD(5)),
346 dump_register(DEPCMD(6)),
347 dump_register(DEPCMD(7)),
348 dump_register(DEPCMD(8)),
349 dump_register(DEPCMD(9)),
350 dump_register(DEPCMD(10)),
351 dump_register(DEPCMD(11)),
352 dump_register(DEPCMD(12)),
353 dump_register(DEPCMD(13)),
354 dump_register(DEPCMD(14)),
355 dump_register(DEPCMD(15)),
356 dump_register(DEPCMD(16)),
357 dump_register(DEPCMD(17)),
358 dump_register(DEPCMD(18)),
359 dump_register(DEPCMD(19)),
360 dump_register(DEPCMD(20)),
361 dump_register(DEPCMD(21)),
362 dump_register(DEPCMD(22)),
363 dump_register(DEPCMD(23)),
364 dump_register(DEPCMD(24)),
365 dump_register(DEPCMD(25)),
366 dump_register(DEPCMD(26)),
367 dump_register(DEPCMD(27)),
368 dump_register(DEPCMD(28)),
369 dump_register(DEPCMD(29)),
370 dump_register(DEPCMD(30)),
371 dump_register(DEPCMD(31)),
372
373 dump_register(OCFG),
374 dump_register(OCTL),
375 dump_register(OEVTEN),
376 dump_register(OSTS),
377};
378
0b9fe32d
FB		 379static int dwc3_mode_show(struct seq_file *s, void *unused)
380{
381 struct dwc3 *dwc = s->private;
382 unsigned long flags;
383 u32 reg;
384
385 spin_lock_irqsave(&dwc->lock, flags);
386 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
387 spin_unlock_irqrestore(&dwc->lock, flags);
388
389 switch (DWC3_GCTL_PRTCAP(reg)) {
390 case DWC3_GCTL_PRTCAP_HOST:
391 seq_printf(s, "host\n");
392 break;
393 case DWC3_GCTL_PRTCAP_DEVICE:
394 seq_printf(s, "device\n");
395 break;
396 case DWC3_GCTL_PRTCAP_OTG:
397 seq_printf(s, "OTG\n");
398 break;
399 default:
400 seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
401 }
402
403 return 0;
404}
405
406static int dwc3_mode_open(struct inode *inode, struct file *file)
407{
408 return single_open(file, dwc3_mode_show, inode->i_private);
409}
410
411static ssize_t dwc3_mode_write(struct file *file,
412 const char __user *ubuf, size_t count, loff_t *ppos)
413{
414 struct seq_file *s = file->private_data;
415 struct dwc3 *dwc = s->private;
416 unsigned long flags;
3140e8cb 417 u32 mode = 0;
0b9fe32d
FB		 418 char buf[32];
419
420 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
421 return -EFAULT;
422
0b9fe32d 423 if (!strncmp(buf, "host", 4))
3140e8cb 424 mode |= DWC3_GCTL_PRTCAP_HOST;
0b9fe32d
FB		 425
426 if (!strncmp(buf, "device", 6))
3140e8cb 427 mode |= DWC3_GCTL_PRTCAP_DEVICE;
0b9fe32d
FB		 428
429 if (!strncmp(buf, "otg", 3))
3140e8cb 430 mode |= DWC3_GCTL_PRTCAP_OTG;
0b9fe32d 431
3140e8cb
SAS		 432 if (mode) {
433 spin_lock_irqsave(&dwc->lock, flags);
434 dwc3_set_mode(dwc, mode);
435 spin_unlock_irqrestore(&dwc->lock, flags);
436 }
0b9fe32d
FB		 437 return count;
438}
439
440static const struct file_operations dwc3_mode_fops = {
441 .open = dwc3_mode_open,
442 .write = dwc3_mode_write,
443 .read = seq_read,
444 .llseek = seq_lseek,
445 .release = single_release,
446};
447
080d921f
FB		 448static int dwc3_testmode_show(struct seq_file *s, void *unused)
449{
450 struct dwc3 *dwc = s->private;
451 unsigned long flags;
452 u32 reg;
453
454 spin_lock_irqsave(&dwc->lock, flags);
455 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
456 reg &= DWC3_DCTL_TSTCTRL_MASK;
457 reg >>= 1;
458 spin_unlock_irqrestore(&dwc->lock, flags);
459
460 switch (reg) {
461 case 0:
462 seq_printf(s, "no test\n");
463 break;
464 case TEST_J:
465 seq_printf(s, "test_j\n");
466 break;
467 case TEST_K:
468 seq_printf(s, "test_k\n");
469 break;
470 case TEST_SE0_NAK:
471 seq_printf(s, "test_se0_nak\n");
472 break;
473 case TEST_PACKET:
474 seq_printf(s, "test_packet\n");
475 break;
476 case TEST_FORCE_EN:
477 seq_printf(s, "test_force_enable\n");
478 break;
479 default:
480 seq_printf(s, "UNKNOWN %d\n", reg);
481 }
482
483 return 0;
484}
485
486static int dwc3_testmode_open(struct inode *inode, struct file *file)
487{
488 return single_open(file, dwc3_testmode_show, inode->i_private);
489}
490
491static ssize_t dwc3_testmode_write(struct file *file,
492 const char __user *ubuf, size_t count, loff_t *ppos)
493{
494 struct seq_file *s = file->private_data;
495 struct dwc3 *dwc = s->private;
496 unsigned long flags;
497 u32 testmode = 0;
498 char buf[32];
499
500 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
501 return -EFAULT;
502
503 if (!strncmp(buf, "test_j", 6))
504 testmode = TEST_J;
505 else if (!strncmp(buf, "test_k", 6))
506 testmode = TEST_K;
09072543 507 else if (!strncmp(buf, "test_se0_nak", 12))
080d921f 508 testmode = TEST_SE0_NAK;
09072543 509 else if (!strncmp(buf, "test_packet", 11))
080d921f 510 testmode = TEST_PACKET;
09072543 511 else if (!strncmp(buf, "test_force_enable", 17))
080d921f
FB		 512 testmode = TEST_FORCE_EN;
513 else
514 testmode = 0;
515
516 spin_lock_irqsave(&dwc->lock, flags);
517 dwc3_gadget_set_test_mode(dwc, testmode);
518 spin_unlock_irqrestore(&dwc->lock, flags);
519
520 return count;
521}
522
523static const struct file_operations dwc3_testmode_fops = {
524 .open = dwc3_testmode_open,
525 .write = dwc3_testmode_write,
526 .read = seq_read,
527 .llseek = seq_lseek,
528 .release = single_release,
529};
530
138801aa
FB		 531static int dwc3_link_state_show(struct seq_file *s, void *unused)
532{
533 struct dwc3 *dwc = s->private;
534 unsigned long flags;
535 enum dwc3_link_state state;
536 u32 reg;
537
538 spin_lock_irqsave(&dwc->lock, flags);
539 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
540 state = DWC3_DSTS_USBLNKST(reg);
541 spin_unlock_irqrestore(&dwc->lock, flags);
542
543 switch (state) {
544 case DWC3_LINK_STATE_U0:
545 seq_printf(s, "U0\n");
546 break;
547 case DWC3_LINK_STATE_U1:
548 seq_printf(s, "U1\n");
549 break;
550 case DWC3_LINK_STATE_U2:
551 seq_printf(s, "U2\n");
552 break;
553 case DWC3_LINK_STATE_U3:
554 seq_printf(s, "U3\n");
555 break;
556 case DWC3_LINK_STATE_SS_DIS:
557 seq_printf(s, "SS.Disabled\n");
558 break;
559 case DWC3_LINK_STATE_RX_DET:
560 seq_printf(s, "Rx.Detect\n");
561 break;
562 case DWC3_LINK_STATE_SS_INACT:
563 seq_printf(s, "SS.Inactive\n");
564 break;
565 case DWC3_LINK_STATE_POLL:
566 seq_printf(s, "Poll\n");
567 break;
568 case DWC3_LINK_STATE_RECOV:
569 seq_printf(s, "Recovery\n");
570 break;
571 case DWC3_LINK_STATE_HRESET:
572 seq_printf(s, "HRESET\n");
573 break;
574 case DWC3_LINK_STATE_CMPLY:
575 seq_printf(s, "Compliance\n");
576 break;
577 case DWC3_LINK_STATE_LPBK:
578 seq_printf(s, "Loopback\n");
579 break;
580 default:
581 seq_printf(s, "UNKNOWN %d\n", reg);
582 }
583
584 return 0;
585}
586
587static int dwc3_link_state_open(struct inode *inode, struct file *file)
588{
589 return single_open(file, dwc3_link_state_show, inode->i_private);
590}
591
592static ssize_t dwc3_link_state_write(struct file *file,
593 const char __user *ubuf, size_t count, loff_t *ppos)
594{
595 struct seq_file *s = file->private_data;
596 struct dwc3 *dwc = s->private;
597 unsigned long flags;
598 enum dwc3_link_state state = 0;
599 char buf[32];
600
601 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
602 return -EFAULT;
603
604 if (!strncmp(buf, "SS.Disabled", 11))
605 state = DWC3_LINK_STATE_SS_DIS;
606 else if (!strncmp(buf, "Rx.Detect", 9))
607 state = DWC3_LINK_STATE_RX_DET;
608 else if (!strncmp(buf, "SS.Inactive", 11))
609 state = DWC3_LINK_STATE_SS_INACT;
610 else if (!strncmp(buf, "Recovery", 8))
611 state = DWC3_LINK_STATE_RECOV;
612 else if (!strncmp(buf, "Compliance", 10))
613 state = DWC3_LINK_STATE_CMPLY;
614 else if (!strncmp(buf, "Loopback", 8))
615 state = DWC3_LINK_STATE_LPBK;
616 else
617 return -EINVAL;
618
619 spin_lock_irqsave(&dwc->lock, flags);
620 dwc3_gadget_set_link_state(dwc, state);
621 spin_unlock_irqrestore(&dwc->lock, flags);
622
623 return count;
624}
625
626static const struct file_operations dwc3_link_state_fops = {
627 .open = dwc3_link_state_open,
628 .write = dwc3_link_state_write,
629 .read = seq_read,
630 .llseek = seq_lseek,
631 .release = single_release,
632};
633
41ac7b3a 634int dwc3_debugfs_init(struct dwc3 *dwc)
72246da4
FB		 635{
636 struct dentry *root;
637 struct dentry *file;
638 int ret;
639
640 root = debugfs_create_dir(dev_name(dwc->dev), NULL);
3d4c0d4f
FB		 641 if (!root) {
642 ret = -ENOMEM;
72246da4
FB		 643 goto err0;
644 }
645
646 dwc->root = root;
647
d7668024
FB		 648 dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
649 if (!dwc->regset) {
650 ret = -ENOMEM;
651 goto err1;
652 }
653
654 dwc->regset->regs = dwc3_regs;
655 dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
656 dwc->regset->base = dwc->regs;
657
658 file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
3d4c0d4f
FB		 659 if (!file) {
660 ret = -ENOMEM;
72246da4
FB		 661 goto err1;
662 }
0b9fe32d 663
388e5c51 664#if IS_ENABLED(CONFIG_USB_DWC3_GADGET)
0b9fe32d
FB		 665 file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
666 dwc, &dwc3_mode_fops);
3d4c0d4f
FB		 667 if (!file) {
668 ret = -ENOMEM;
0b9fe32d
FB		 669 goto err1;
670 }
671
080d921f
FB		 672 file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root,
673 dwc, &dwc3_testmode_fops);
3d4c0d4f
FB		 674 if (!file) {
675 ret = -ENOMEM;
080d921f
FB		 676 goto err1;
677 }
678
138801aa
FB		 679 file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root,
680 dwc, &dwc3_link_state_fops);
3d4c0d4f
FB		 681 if (!file) {
682 ret = -ENOMEM;
138801aa
FB		 683 goto err1;
684 }
388e5c51 685#endif
138801aa 686
72246da4
FB		 687 return 0;
688
689err1:
690 debugfs_remove_recursive(root);
691
692err0:
693 return ret;
694}
695
fb4e98ab 696void dwc3_debugfs_exit(struct dwc3 *dwc)
72246da4
FB		 697{
698 debugfs_remove_recursive(dwc->root);
699 dwc->root = NULL;
700}
Linux 6.x block layer and io_uring tree(s)