kernel/drivers/usb/dwc3/debugfs.c

   1 /**
   2  * debugfs.c - DesignWare USB3 DRD Controller DebugFS file
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/types.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/debugfs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/delay.h>
  27 #include <linux/uaccess.h>
  28
  29 #include <linux/usb/ch9.h>
  30
  31 #include "core.h"
  32 #include "gadget.h"
  33 #include "io.h"
  34 #include "debug.h"
  35
  36 #define dump_register(nm)                               \
  37 {                                                       \
  38         .name   = __stringify(nm),                      \
  39         .offset = DWC3_ ##nm - DWC3_GLOBALS_REGS_START, \
  40 }
  41
  42 static const struct debugfs_reg32 dwc3_regs[] = {
  43         dump_register(GSBUSCFG0),
  44         dump_register(GSBUSCFG1),
  45         dump_register(GTXTHRCFG),
  46         dump_register(GRXTHRCFG),
  47         dump_register(GCTL),
  48         dump_register(GEVTEN),
  49         dump_register(GSTS),
  50         dump_register(GSNPSID),
  51         dump_register(GGPIO),
  52         dump_register(GUID),
  53         dump_register(GUCTL),
  54         dump_register(GBUSERRADDR0),
  55         dump_register(GBUSERRADDR1),
  56         dump_register(GPRTBIMAP0),
  57         dump_register(GPRTBIMAP1),
  58         dump_register(GHWPARAMS0),
  59         dump_register(GHWPARAMS1),
  60         dump_register(GHWPARAMS2),
  61         dump_register(GHWPARAMS3),
  62         dump_register(GHWPARAMS4),
  63         dump_register(GHWPARAMS5),
  64         dump_register(GHWPARAMS6),
  65         dump_register(GHWPARAMS7),
  66         dump_register(GDBGFIFOSPACE),
  67         dump_register(GDBGLTSSM),
  68         dump_register(GPRTBIMAP_HS0),
  69         dump_register(GPRTBIMAP_HS1),
  70         dump_register(GPRTBIMAP_FS0),
  71         dump_register(GPRTBIMAP_FS1),
  72
  73         dump_register(GUSB2PHYCFG(0)),
  74         dump_register(GUSB2PHYCFG(1)),
  75         dump_register(GUSB2PHYCFG(2)),
  76         dump_register(GUSB2PHYCFG(3)),
  77         dump_register(GUSB2PHYCFG(4)),
  78         dump_register(GUSB2PHYCFG(5)),
  79         dump_register(GUSB2PHYCFG(6)),
  80         dump_register(GUSB2PHYCFG(7)),
  81         dump_register(GUSB2PHYCFG(8)),
  82         dump_register(GUSB2PHYCFG(9)),
  83         dump_register(GUSB2PHYCFG(10)),
  84         dump_register(GUSB2PHYCFG(11)),
  85         dump_register(GUSB2PHYCFG(12)),
  86         dump_register(GUSB2PHYCFG(13)),
  87         dump_register(GUSB2PHYCFG(14)),
  88         dump_register(GUSB2PHYCFG(15)),
  89
  90         dump_register(GUSB2I2CCTL(0)),
  91         dump_register(GUSB2I2CCTL(1)),
  92         dump_register(GUSB2I2CCTL(2)),
  93         dump_register(GUSB2I2CCTL(3)),
  94         dump_register(GUSB2I2CCTL(4)),
  95         dump_register(GUSB2I2CCTL(5)),
  96         dump_register(GUSB2I2CCTL(6)),
  97         dump_register(GUSB2I2CCTL(7)),
  98         dump_register(GUSB2I2CCTL(8)),
  99         dump_register(GUSB2I2CCTL(9)),
 100         dump_register(GUSB2I2CCTL(10)),
 101         dump_register(GUSB2I2CCTL(11)),
 102         dump_register(GUSB2I2CCTL(12)),
 103         dump_register(GUSB2I2CCTL(13)),
 104         dump_register(GUSB2I2CCTL(14)),
 105         dump_register(GUSB2I2CCTL(15)),
 106
 107         dump_register(GUSB2PHYACC(0)),
 108         dump_register(GUSB2PHYACC(1)),
 109         dump_register(GUSB2PHYACC(2)),
 110         dump_register(GUSB2PHYACC(3)),
 111         dump_register(GUSB2PHYACC(4)),
 112         dump_register(GUSB2PHYACC(5)),
 113         dump_register(GUSB2PHYACC(6)),
 114         dump_register(GUSB2PHYACC(7)),
 115         dump_register(GUSB2PHYACC(8)),
 116         dump_register(GUSB2PHYACC(9)),
 117         dump_register(GUSB2PHYACC(10)),
 118         dump_register(GUSB2PHYACC(11)),
 119         dump_register(GUSB2PHYACC(12)),
 120         dump_register(GUSB2PHYACC(13)),
 121         dump_register(GUSB2PHYACC(14)),
 122         dump_register(GUSB2PHYACC(15)),
 123
 124         dump_register(GUSB3PIPECTL(0)),
 125         dump_register(GUSB3PIPECTL(1)),
 126         dump_register(GUSB3PIPECTL(2)),
 127         dump_register(GUSB3PIPECTL(3)),
 128         dump_register(GUSB3PIPECTL(4)),
 129         dump_register(GUSB3PIPECTL(5)),
 130         dump_register(GUSB3PIPECTL(6)),
 131         dump_register(GUSB3PIPECTL(7)),
 132         dump_register(GUSB3PIPECTL(8)),
 133         dump_register(GUSB3PIPECTL(9)),
 134         dump_register(GUSB3PIPECTL(10)),
 135         dump_register(GUSB3PIPECTL(11)),
 136         dump_register(GUSB3PIPECTL(12)),
 137         dump_register(GUSB3PIPECTL(13)),
 138         dump_register(GUSB3PIPECTL(14)),
 139         dump_register(GUSB3PIPECTL(15)),
 140
 141         dump_register(GTXFIFOSIZ(0)),
 142         dump_register(GTXFIFOSIZ(1)),
 143         dump_register(GTXFIFOSIZ(2)),
 144         dump_register(GTXFIFOSIZ(3)),
 145         dump_register(GTXFIFOSIZ(4)),
 146         dump_register(GTXFIFOSIZ(5)),
 147         dump_register(GTXFIFOSIZ(6)),
 148         dump_register(GTXFIFOSIZ(7)),
 149         dump_register(GTXFIFOSIZ(8)),
 150         dump_register(GTXFIFOSIZ(9)),
 151         dump_register(GTXFIFOSIZ(10)),
 152         dump_register(GTXFIFOSIZ(11)),
 153         dump_register(GTXFIFOSIZ(12)),
 154         dump_register(GTXFIFOSIZ(13)),
 155         dump_register(GTXFIFOSIZ(14)),
 156         dump_register(GTXFIFOSIZ(15)),
 157         dump_register(GTXFIFOSIZ(16)),
 158         dump_register(GTXFIFOSIZ(17)),
 159         dump_register(GTXFIFOSIZ(18)),
 160         dump_register(GTXFIFOSIZ(19)),
 161         dump_register(GTXFIFOSIZ(20)),
 162         dump_register(GTXFIFOSIZ(21)),
 163         dump_register(GTXFIFOSIZ(22)),
 164         dump_register(GTXFIFOSIZ(23)),
 165         dump_register(GTXFIFOSIZ(24)),
 166         dump_register(GTXFIFOSIZ(25)),
 167         dump_register(GTXFIFOSIZ(26)),
 168         dump_register(GTXFIFOSIZ(27)),
 169         dump_register(GTXFIFOSIZ(28)),
 170         dump_register(GTXFIFOSIZ(29)),
 171         dump_register(GTXFIFOSIZ(30)),
 172         dump_register(GTXFIFOSIZ(31)),
 173
 174         dump_register(GRXFIFOSIZ(0)),
 175         dump_register(GRXFIFOSIZ(1)),
 176         dump_register(GRXFIFOSIZ(2)),
 177         dump_register(GRXFIFOSIZ(3)),
 178         dump_register(GRXFIFOSIZ(4)),
 179         dump_register(GRXFIFOSIZ(5)),
 180         dump_register(GRXFIFOSIZ(6)),
 181         dump_register(GRXFIFOSIZ(7)),
 182         dump_register(GRXFIFOSIZ(8)),
 183         dump_register(GRXFIFOSIZ(9)),
 184         dump_register(GRXFIFOSIZ(10)),
 185         dump_register(GRXFIFOSIZ(11)),
 186         dump_register(GRXFIFOSIZ(12)),
 187         dump_register(GRXFIFOSIZ(13)),
 188         dump_register(GRXFIFOSIZ(14)),
 189         dump_register(GRXFIFOSIZ(15)),
 190         dump_register(GRXFIFOSIZ(16)),
 191         dump_register(GRXFIFOSIZ(17)),
 192         dump_register(GRXFIFOSIZ(18)),
 193         dump_register(GRXFIFOSIZ(19)),
 194         dump_register(GRXFIFOSIZ(20)),
 195         dump_register(GRXFIFOSIZ(21)),
 196         dump_register(GRXFIFOSIZ(22)),
 197         dump_register(GRXFIFOSIZ(23)),
 198         dump_register(GRXFIFOSIZ(24)),
 199         dump_register(GRXFIFOSIZ(25)),
 200         dump_register(GRXFIFOSIZ(26)),
 201         dump_register(GRXFIFOSIZ(27)),
 202         dump_register(GRXFIFOSIZ(28)),
 203         dump_register(GRXFIFOSIZ(29)),
 204         dump_register(GRXFIFOSIZ(30)),
 205         dump_register(GRXFIFOSIZ(31)),
 206
 207         dump_register(GEVNTADRLO(0)),
 208         dump_register(GEVNTADRHI(0)),
 209         dump_register(GEVNTSIZ(0)),
 210         dump_register(GEVNTCOUNT(0)),
 211
 212         dump_register(GHWPARAMS8),
 213         dump_register(DCFG),
 214         dump_register(DCTL),
 215         dump_register(DEVTEN),
 216         dump_register(DSTS),
 217         dump_register(DGCMDPAR),
 218         dump_register(DGCMD),
 219         dump_register(DALEPENA),
 220
 221         dump_register(DEPCMDPAR2(0)),
 222         dump_register(DEPCMDPAR2(1)),
 223         dump_register(DEPCMDPAR2(2)),
 224         dump_register(DEPCMDPAR2(3)),
 225         dump_register(DEPCMDPAR2(4)),
 226         dump_register(DEPCMDPAR2(5)),
 227         dump_register(DEPCMDPAR2(6)),
 228         dump_register(DEPCMDPAR2(7)),
 229         dump_register(DEPCMDPAR2(8)),
 230         dump_register(DEPCMDPAR2(9)),
 231         dump_register(DEPCMDPAR2(10)),
 232         dump_register(DEPCMDPAR2(11)),
 233         dump_register(DEPCMDPAR2(12)),
 234         dump_register(DEPCMDPAR2(13)),
 235         dump_register(DEPCMDPAR2(14)),
 236         dump_register(DEPCMDPAR2(15)),
 237         dump_register(DEPCMDPAR2(16)),
 238         dump_register(DEPCMDPAR2(17)),
 239         dump_register(DEPCMDPAR2(18)),
 240         dump_register(DEPCMDPAR2(19)),
 241         dump_register(DEPCMDPAR2(20)),
 242         dump_register(DEPCMDPAR2(21)),
 243         dump_register(DEPCMDPAR2(22)),
 244         dump_register(DEPCMDPAR2(23)),
 245         dump_register(DEPCMDPAR2(24)),
 246         dump_register(DEPCMDPAR2(25)),
 247         dump_register(DEPCMDPAR2(26)),
 248         dump_register(DEPCMDPAR2(27)),
 249         dump_register(DEPCMDPAR2(28)),
 250         dump_register(DEPCMDPAR2(29)),
 251         dump_register(DEPCMDPAR2(30)),
 252         dump_register(DEPCMDPAR2(31)),
 253
 254         dump_register(DEPCMDPAR1(0)),
 255         dump_register(DEPCMDPAR1(1)),
 256         dump_register(DEPCMDPAR1(2)),
 257         dump_register(DEPCMDPAR1(3)),
 258         dump_register(DEPCMDPAR1(4)),
 259         dump_register(DEPCMDPAR1(5)),
 260         dump_register(DEPCMDPAR1(6)),
 261         dump_register(DEPCMDPAR1(7)),
 262         dump_register(DEPCMDPAR1(8)),
 263         dump_register(DEPCMDPAR1(9)),
 264         dump_register(DEPCMDPAR1(10)),
 265         dump_register(DEPCMDPAR1(11)),
 266         dump_register(DEPCMDPAR1(12)),
 267         dump_register(DEPCMDPAR1(13)),
 268         dump_register(DEPCMDPAR1(14)),
 269         dump_register(DEPCMDPAR1(15)),
 270         dump_register(DEPCMDPAR1(16)),
 271         dump_register(DEPCMDPAR1(17)),
 272         dump_register(DEPCMDPAR1(18)),
 273         dump_register(DEPCMDPAR1(19)),
 274         dump_register(DEPCMDPAR1(20)),
 275         dump_register(DEPCMDPAR1(21)),
 276         dump_register(DEPCMDPAR1(22)),
 277         dump_register(DEPCMDPAR1(23)),
 278         dump_register(DEPCMDPAR1(24)),
 279         dump_register(DEPCMDPAR1(25)),
 280         dump_register(DEPCMDPAR1(26)),
 281         dump_register(DEPCMDPAR1(27)),
 282         dump_register(DEPCMDPAR1(28)),
 283         dump_register(DEPCMDPAR1(29)),
 284         dump_register(DEPCMDPAR1(30)),
 285         dump_register(DEPCMDPAR1(31)),
 286
 287         dump_register(DEPCMDPAR0(0)),
 288         dump_register(DEPCMDPAR0(1)),
 289         dump_register(DEPCMDPAR0(2)),
 290         dump_register(DEPCMDPAR0(3)),
 291         dump_register(DEPCMDPAR0(4)),
 292         dump_register(DEPCMDPAR0(5)),
 293         dump_register(DEPCMDPAR0(6)),
 294         dump_register(DEPCMDPAR0(7)),
 295         dump_register(DEPCMDPAR0(8)),
 296         dump_register(DEPCMDPAR0(9)),
 297         dump_register(DEPCMDPAR0(10)),
 298         dump_register(DEPCMDPAR0(11)),
 299         dump_register(DEPCMDPAR0(12)),
 300         dump_register(DEPCMDPAR0(13)),
 301         dump_register(DEPCMDPAR0(14)),
 302         dump_register(DEPCMDPAR0(15)),
 303         dump_register(DEPCMDPAR0(16)),
 304         dump_register(DEPCMDPAR0(17)),
 305         dump_register(DEPCMDPAR0(18)),
 306         dump_register(DEPCMDPAR0(19)),
 307         dump_register(DEPCMDPAR0(20)),
 308         dump_register(DEPCMDPAR0(21)),
 309         dump_register(DEPCMDPAR0(22)),
 310         dump_register(DEPCMDPAR0(23)),
 311         dump_register(DEPCMDPAR0(24)),
 312         dump_register(DEPCMDPAR0(25)),
 313         dump_register(DEPCMDPAR0(26)),
 314         dump_register(DEPCMDPAR0(27)),
 315         dump_register(DEPCMDPAR0(28)),
 316         dump_register(DEPCMDPAR0(29)),
 317         dump_register(DEPCMDPAR0(30)),
 318         dump_register(DEPCMDPAR0(31)),
 319
 320         dump_register(DEPCMD(0)),
 321         dump_register(DEPCMD(1)),
 322         dump_register(DEPCMD(2)),
 323         dump_register(DEPCMD(3)),
 324         dump_register(DEPCMD(4)),
 325         dump_register(DEPCMD(5)),
 326         dump_register(DEPCMD(6)),
 327         dump_register(DEPCMD(7)),
 328         dump_register(DEPCMD(8)),
 329         dump_register(DEPCMD(9)),
 330         dump_register(DEPCMD(10)),
 331         dump_register(DEPCMD(11)),
 332         dump_register(DEPCMD(12)),
 333         dump_register(DEPCMD(13)),
 334         dump_register(DEPCMD(14)),
 335         dump_register(DEPCMD(15)),
 336         dump_register(DEPCMD(16)),
 337         dump_register(DEPCMD(17)),
 338         dump_register(DEPCMD(18)),
 339         dump_register(DEPCMD(19)),
 340         dump_register(DEPCMD(20)),
 341         dump_register(DEPCMD(21)),
 342         dump_register(DEPCMD(22)),
 343         dump_register(DEPCMD(23)),
 344         dump_register(DEPCMD(24)),
 345         dump_register(DEPCMD(25)),
 346         dump_register(DEPCMD(26)),
 347         dump_register(DEPCMD(27)),
 348         dump_register(DEPCMD(28)),
 349         dump_register(DEPCMD(29)),
 350         dump_register(DEPCMD(30)),
 351         dump_register(DEPCMD(31)),
 352
 353         dump_register(OCFG),
 354         dump_register(OCTL),
 355         dump_register(OEVT),
 356         dump_register(OEVTEN),
 357         dump_register(OSTS),
 358 };
 359
 360 static int dwc3_mode_show(struct seq_file *s, void *unused)
 361 {
 362         struct dwc3             *dwc = s->private;
 363         unsigned long           flags;
 364         u32                     reg;
 365
 366         spin_lock_irqsave(&dwc->lock, flags);
 367         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 368         spin_unlock_irqrestore(&dwc->lock, flags);
 369
 370         switch (DWC3_GCTL_PRTCAP(reg)) {
 371         case DWC3_GCTL_PRTCAP_HOST:
 372                 seq_printf(s, "host\n");
 373                 break;
 374         case DWC3_GCTL_PRTCAP_DEVICE:
 375                 seq_printf(s, "device\n");
 376                 break;
 377         case DWC3_GCTL_PRTCAP_OTG:
 378                 seq_printf(s, "OTG\n");
 379                 break;
 380         default:
 381                 seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
 382         }
 383
 384         return 0;
 385 }
 386
 387 static int dwc3_mode_open(struct inode *inode, struct file *file)
 388 {
 389         return single_open(file, dwc3_mode_show, inode->i_private);
 390 }
 391
 392 static ssize_t dwc3_mode_write(struct file *file,
 393                 const char __user *ubuf, size_t count, loff_t *ppos)
 394 {
 395         struct seq_file         *s = file->private_data;
 396         struct dwc3             *dwc = s->private;
 397         unsigned long           flags;
 398         u32                     mode = 0;
 399         char                    buf[32];
 400
 401         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 402                 return -EFAULT;
 403
 404         if (!strncmp(buf, "host", 4))
 405                 mode |= DWC3_GCTL_PRTCAP_HOST;
 406
 407         if (!strncmp(buf, "device", 6))
 408                 mode |= DWC3_GCTL_PRTCAP_DEVICE;
 409
 410         if (!strncmp(buf, "otg", 3))
 411                 mode |= DWC3_GCTL_PRTCAP_OTG;
 412
 413         if (mode) {
 414                 spin_lock_irqsave(&dwc->lock, flags);
 415                 dwc3_set_mode(dwc, mode);
 416                 spin_unlock_irqrestore(&dwc->lock, flags);
 417         }
 418         return count;
 419 }
 420
 421 static const struct file_operations dwc3_mode_fops = {
 422         .open                   = dwc3_mode_open,
 423         .write                  = dwc3_mode_write,
 424         .read                   = seq_read,
 425         .llseek                 = seq_lseek,
 426         .release                = single_release,
 427 };
 428
 429 static int dwc3_testmode_show(struct seq_file *s, void *unused)
 430 {
 431         struct dwc3             *dwc = s->private;
 432         unsigned long           flags;
 433         u32                     reg;
 434
 435         spin_lock_irqsave(&dwc->lock, flags);
 436         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 437         reg &= DWC3_DCTL_TSTCTRL_MASK;
 438         reg >>= 1;
 439         spin_unlock_irqrestore(&dwc->lock, flags);
 440
 441         switch (reg) {
 442         case 0:
 443                 seq_printf(s, "no test\n");
 444                 break;
 445         case TEST_J:
 446                 seq_printf(s, "test_j\n");
 447                 break;
 448         case TEST_K:
 449                 seq_printf(s, "test_k\n");
 450                 break;
 451         case TEST_SE0_NAK:
 452                 seq_printf(s, "test_se0_nak\n");
 453                 break;
 454         case TEST_PACKET:
 455                 seq_printf(s, "test_packet\n");
 456                 break;
 457         case TEST_FORCE_EN:
 458                 seq_printf(s, "test_force_enable\n");
 459                 break;
 460         default:
 461                 seq_printf(s, "UNKNOWN %d\n", reg);
 462         }
 463
 464         return 0;
 465 }
 466
 467 static int dwc3_testmode_open(struct inode *inode, struct file *file)
 468 {
 469         return single_open(file, dwc3_testmode_show, inode->i_private);
 470 }
 471
 472 static ssize_t dwc3_testmode_write(struct file *file,
 473                 const char __user *ubuf, size_t count, loff_t *ppos)
 474 {
 475         struct seq_file         *s = file->private_data;
 476         struct dwc3             *dwc = s->private;
 477         unsigned long           flags;
 478         u32                     testmode = 0;
 479         char                    buf[32];
 480
 481         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 482                 return -EFAULT;
 483
 484         if (!strncmp(buf, "test_j", 6))
 485                 testmode = TEST_J;
 486         else if (!strncmp(buf, "test_k", 6))
 487                 testmode = TEST_K;
 488         else if (!strncmp(buf, "test_se0_nak", 12))
 489                 testmode = TEST_SE0_NAK;
 490         else if (!strncmp(buf, "test_packet", 11))
 491                 testmode = TEST_PACKET;
 492         else if (!strncmp(buf, "test_force_enable", 17))
 493                 testmode = TEST_FORCE_EN;
 494         else
 495                 testmode = 0;
 496
 497         spin_lock_irqsave(&dwc->lock, flags);
 498         dwc3_gadget_set_test_mode(dwc, testmode);
 499         spin_unlock_irqrestore(&dwc->lock, flags);
 500
 501         return count;
 502 }
 503
 504 static const struct file_operations dwc3_testmode_fops = {
 505         .open                   = dwc3_testmode_open,
 506         .write                  = dwc3_testmode_write,
 507         .read                   = seq_read,
 508         .llseek                 = seq_lseek,
 509         .release                = single_release,
 510 };
 511
 512 static int dwc3_link_state_show(struct seq_file *s, void *unused)
 513 {
 514         struct dwc3             *dwc = s->private;
 515         unsigned long           flags;
 516         enum dwc3_link_state    state;
 517         u32                     reg;
 518
 519         spin_lock_irqsave(&dwc->lock, flags);
 520         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 521         state = DWC3_DSTS_USBLNKST(reg);
 522         spin_unlock_irqrestore(&dwc->lock, flags);
 523
 524         switch (state) {
 525         case DWC3_LINK_STATE_U0:
 526                 seq_printf(s, "U0\n");
 527                 break;
 528         case DWC3_LINK_STATE_U1:
 529                 seq_printf(s, "U1\n");
 530                 break;
 531         case DWC3_LINK_STATE_U2:
 532                 seq_printf(s, "U2\n");
 533                 break;
 534         case DWC3_LINK_STATE_U3:
 535                 seq_printf(s, "U3\n");
 536                 break;
 537         case DWC3_LINK_STATE_SS_DIS:
 538                 seq_printf(s, "SS.Disabled\n");
 539                 break;
 540         case DWC3_LINK_STATE_RX_DET:
 541                 seq_printf(s, "Rx.Detect\n");
 542                 break;
 543         case DWC3_LINK_STATE_SS_INACT:
 544                 seq_printf(s, "SS.Inactive\n");
 545                 break;
 546         case DWC3_LINK_STATE_POLL:
 547                 seq_printf(s, "Poll\n");
 548                 break;
 549         case DWC3_LINK_STATE_RECOV:
 550                 seq_printf(s, "Recovery\n");
 551                 break;
 552         case DWC3_LINK_STATE_HRESET:
 553                 seq_printf(s, "HRESET\n");
 554                 break;
 555         case DWC3_LINK_STATE_CMPLY:
 556                 seq_printf(s, "Compliance\n");
 557                 break;
 558         case DWC3_LINK_STATE_LPBK:
 559                 seq_printf(s, "Loopback\n");
 560                 break;
 561         case DWC3_LINK_STATE_RESET:
 562                 seq_printf(s, "Reset\n");
 563                 break;
 564         case DWC3_LINK_STATE_RESUME:
 565                 seq_printf(s, "Resume\n");
 566                 break;
 567         default:
 568                 seq_printf(s, "UNKNOWN %d\n", state);
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int dwc3_link_state_open(struct inode *inode, struct file *file)
 575 {
 576         return single_open(file, dwc3_link_state_show, inode->i_private);
 577 }
 578
 579 static ssize_t dwc3_link_state_write(struct file *file,
 580                 const char __user *ubuf, size_t count, loff_t *ppos)
 581 {
 582         struct seq_file         *s = file->private_data;
 583         struct dwc3             *dwc = s->private;
 584         unsigned long           flags;
 585         enum dwc3_link_state    state = 0;
 586         char                    buf[32];
 587
 588         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 589                 return -EFAULT;
 590
 591         if (!strncmp(buf, "SS.Disabled", 11))
 592                 state = DWC3_LINK_STATE_SS_DIS;
 593         else if (!strncmp(buf, "Rx.Detect", 9))
 594                 state = DWC3_LINK_STATE_RX_DET;
 595         else if (!strncmp(buf, "SS.Inactive", 11))
 596                 state = DWC3_LINK_STATE_SS_INACT;
 597         else if (!strncmp(buf, "Recovery", 8))
 598                 state = DWC3_LINK_STATE_RECOV;
 599         else if (!strncmp(buf, "Compliance", 10))
 600                 state = DWC3_LINK_STATE_CMPLY;
 601         else if (!strncmp(buf, "Loopback", 8))
 602                 state = DWC3_LINK_STATE_LPBK;
 603         else
 604                 return -EINVAL;
 605
 606         spin_lock_irqsave(&dwc->lock, flags);
 607         dwc3_gadget_set_link_state(dwc, state);
 608         spin_unlock_irqrestore(&dwc->lock, flags);
 609
 610         return count;
 611 }
 612
 613 static const struct file_operations dwc3_link_state_fops = {
 614         .open                   = dwc3_link_state_open,
 615         .write                  = dwc3_link_state_write,
 616         .read                   = seq_read,
 617         .llseek                 = seq_lseek,
 618         .release                = single_release,
 619 };
 620
 621 int dwc3_debugfs_init(struct dwc3 *dwc)
 622 {
 623         struct dentry           *root;
 624         struct dentry           *file;
 625         int                     ret;
 626
 627         root = debugfs_create_dir(dev_name(dwc->dev), NULL);
 628         if (!root) {
 629                 ret = -ENOMEM;
 630                 goto err0;
 631         }
 632
 633         dwc->root = root;
 634
 635         dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
 636         if (!dwc->regset) {
 637                 ret = -ENOMEM;
 638                 goto err1;
 639         }
 640
 641         dwc->regset->regs = dwc3_regs;
 642         dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
 643         dwc->regset->base = dwc->regs;
 644
 645         file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
 646         if (!file) {
 647                 ret = -ENOMEM;
 648                 goto err1;
 649         }
 650
 651         if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
 652                 file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
 653                                 dwc, &dwc3_mode_fops);
 654                 if (!file) {
 655                         ret = -ENOMEM;
 656                         goto err1;
 657                 }
 658         }
 659
 660         if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) ||
 661                         IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
 662                 file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root,
 663                                 dwc, &dwc3_testmode_fops);
 664                 if (!file) {
 665                         ret = -ENOMEM;
 666                         goto err1;
 667                 }
 668
 669                 file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root,
 670                                 dwc, &dwc3_link_state_fops);
 671                 if (!file) {
 672                         ret = -ENOMEM;
 673                         goto err1;
 674                 }
 675         }
 676
 677         return 0;
 678
 679 err1:
 680         debugfs_remove_recursive(root);
 681
 682 err0:
 683         return ret;
 684 }
 685
 686 void dwc3_debugfs_exit(struct dwc3 *dwc)
 687 {
 688         debugfs_remove_recursive(dwc->root);
 689         dwc->root = NULL;
 690 }