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(GUCTL1),
  51         dump_register(GSNPSID),
  52         dump_register(GGPIO),
  53         dump_register(GUID),
  54         dump_register(GUCTL),
  55         dump_register(GBUSERRADDR0),
  56         dump_register(GBUSERRADDR1),
  57         dump_register(GPRTBIMAP0),
  58         dump_register(GPRTBIMAP1),
  59         dump_register(GHWPARAMS0),
  60         dump_register(GHWPARAMS1),
  61         dump_register(GHWPARAMS2),
  62         dump_register(GHWPARAMS3),
  63         dump_register(GHWPARAMS4),
  64         dump_register(GHWPARAMS5),
  65         dump_register(GHWPARAMS6),
  66         dump_register(GHWPARAMS7),
  67         dump_register(GDBGFIFOSPACE),
  68         dump_register(GDBGLTSSM),
  69         dump_register(GPRTBIMAP_HS0),
  70         dump_register(GPRTBIMAP_HS1),
  71         dump_register(GPRTBIMAP_FS0),
  72         dump_register(GPRTBIMAP_FS1),
  73
  74         dump_register(GUSB2PHYCFG(0)),
  75         dump_register(GUSB2PHYCFG(1)),
  76         dump_register(GUSB2PHYCFG(2)),
  77         dump_register(GUSB2PHYCFG(3)),
  78         dump_register(GUSB2PHYCFG(4)),
  79         dump_register(GUSB2PHYCFG(5)),
  80         dump_register(GUSB2PHYCFG(6)),
  81         dump_register(GUSB2PHYCFG(7)),
  82         dump_register(GUSB2PHYCFG(8)),
  83         dump_register(GUSB2PHYCFG(9)),
  84         dump_register(GUSB2PHYCFG(10)),
  85         dump_register(GUSB2PHYCFG(11)),
  86         dump_register(GUSB2PHYCFG(12)),
  87         dump_register(GUSB2PHYCFG(13)),
  88         dump_register(GUSB2PHYCFG(14)),
  89         dump_register(GUSB2PHYCFG(15)),
  90
  91         dump_register(GUSB2I2CCTL(0)),
  92         dump_register(GUSB2I2CCTL(1)),
  93         dump_register(GUSB2I2CCTL(2)),
  94         dump_register(GUSB2I2CCTL(3)),
  95         dump_register(GUSB2I2CCTL(4)),
  96         dump_register(GUSB2I2CCTL(5)),
  97         dump_register(GUSB2I2CCTL(6)),
  98         dump_register(GUSB2I2CCTL(7)),
  99         dump_register(GUSB2I2CCTL(8)),
 100         dump_register(GUSB2I2CCTL(9)),
 101         dump_register(GUSB2I2CCTL(10)),
 102         dump_register(GUSB2I2CCTL(11)),
 103         dump_register(GUSB2I2CCTL(12)),
 104         dump_register(GUSB2I2CCTL(13)),
 105         dump_register(GUSB2I2CCTL(14)),
 106         dump_register(GUSB2I2CCTL(15)),
 107
 108         dump_register(GUSB2PHYACC(0)),
 109         dump_register(GUSB2PHYACC(1)),
 110         dump_register(GUSB2PHYACC(2)),
 111         dump_register(GUSB2PHYACC(3)),
 112         dump_register(GUSB2PHYACC(4)),
 113         dump_register(GUSB2PHYACC(5)),
 114         dump_register(GUSB2PHYACC(6)),
 115         dump_register(GUSB2PHYACC(7)),
 116         dump_register(GUSB2PHYACC(8)),
 117         dump_register(GUSB2PHYACC(9)),
 118         dump_register(GUSB2PHYACC(10)),
 119         dump_register(GUSB2PHYACC(11)),
 120         dump_register(GUSB2PHYACC(12)),
 121         dump_register(GUSB2PHYACC(13)),
 122         dump_register(GUSB2PHYACC(14)),
 123         dump_register(GUSB2PHYACC(15)),
 124
 125         dump_register(GUSB3PIPECTL(0)),
 126         dump_register(GUSB3PIPECTL(1)),
 127         dump_register(GUSB3PIPECTL(2)),
 128         dump_register(GUSB3PIPECTL(3)),
 129         dump_register(GUSB3PIPECTL(4)),
 130         dump_register(GUSB3PIPECTL(5)),
 131         dump_register(GUSB3PIPECTL(6)),
 132         dump_register(GUSB3PIPECTL(7)),
 133         dump_register(GUSB3PIPECTL(8)),
 134         dump_register(GUSB3PIPECTL(9)),
 135         dump_register(GUSB3PIPECTL(10)),
 136         dump_register(GUSB3PIPECTL(11)),
 137         dump_register(GUSB3PIPECTL(12)),
 138         dump_register(GUSB3PIPECTL(13)),
 139         dump_register(GUSB3PIPECTL(14)),
 140         dump_register(GUSB3PIPECTL(15)),
 141
 142         dump_register(GTXFIFOSIZ(0)),
 143         dump_register(GTXFIFOSIZ(1)),
 144         dump_register(GTXFIFOSIZ(2)),
 145         dump_register(GTXFIFOSIZ(3)),
 146         dump_register(GTXFIFOSIZ(4)),
 147         dump_register(GTXFIFOSIZ(5)),
 148         dump_register(GTXFIFOSIZ(6)),
 149         dump_register(GTXFIFOSIZ(7)),
 150         dump_register(GTXFIFOSIZ(8)),
 151         dump_register(GTXFIFOSIZ(9)),
 152         dump_register(GTXFIFOSIZ(10)),
 153         dump_register(GTXFIFOSIZ(11)),
 154         dump_register(GTXFIFOSIZ(12)),
 155         dump_register(GTXFIFOSIZ(13)),
 156         dump_register(GTXFIFOSIZ(14)),
 157         dump_register(GTXFIFOSIZ(15)),
 158         dump_register(GTXFIFOSIZ(16)),
 159         dump_register(GTXFIFOSIZ(17)),
 160         dump_register(GTXFIFOSIZ(18)),
 161         dump_register(GTXFIFOSIZ(19)),
 162         dump_register(GTXFIFOSIZ(20)),
 163         dump_register(GTXFIFOSIZ(21)),
 164         dump_register(GTXFIFOSIZ(22)),
 165         dump_register(GTXFIFOSIZ(23)),
 166         dump_register(GTXFIFOSIZ(24)),
 167         dump_register(GTXFIFOSIZ(25)),
 168         dump_register(GTXFIFOSIZ(26)),
 169         dump_register(GTXFIFOSIZ(27)),
 170         dump_register(GTXFIFOSIZ(28)),
 171         dump_register(GTXFIFOSIZ(29)),
 172         dump_register(GTXFIFOSIZ(30)),
 173         dump_register(GTXFIFOSIZ(31)),
 174
 175         dump_register(GRXFIFOSIZ(0)),
 176         dump_register(GRXFIFOSIZ(1)),
 177         dump_register(GRXFIFOSIZ(2)),
 178         dump_register(GRXFIFOSIZ(3)),
 179         dump_register(GRXFIFOSIZ(4)),
 180         dump_register(GRXFIFOSIZ(5)),
 181         dump_register(GRXFIFOSIZ(6)),
 182         dump_register(GRXFIFOSIZ(7)),
 183         dump_register(GRXFIFOSIZ(8)),
 184         dump_register(GRXFIFOSIZ(9)),
 185         dump_register(GRXFIFOSIZ(10)),
 186         dump_register(GRXFIFOSIZ(11)),
 187         dump_register(GRXFIFOSIZ(12)),
 188         dump_register(GRXFIFOSIZ(13)),
 189         dump_register(GRXFIFOSIZ(14)),
 190         dump_register(GRXFIFOSIZ(15)),
 191         dump_register(GRXFIFOSIZ(16)),
 192         dump_register(GRXFIFOSIZ(17)),
 193         dump_register(GRXFIFOSIZ(18)),
 194         dump_register(GRXFIFOSIZ(19)),
 195         dump_register(GRXFIFOSIZ(20)),
 196         dump_register(GRXFIFOSIZ(21)),
 197         dump_register(GRXFIFOSIZ(22)),
 198         dump_register(GRXFIFOSIZ(23)),
 199         dump_register(GRXFIFOSIZ(24)),
 200         dump_register(GRXFIFOSIZ(25)),
 201         dump_register(GRXFIFOSIZ(26)),
 202         dump_register(GRXFIFOSIZ(27)),
 203         dump_register(GRXFIFOSIZ(28)),
 204         dump_register(GRXFIFOSIZ(29)),
 205         dump_register(GRXFIFOSIZ(30)),
 206         dump_register(GRXFIFOSIZ(31)),
 207
 208         dump_register(GEVNTADRLO(0)),
 209         dump_register(GEVNTADRHI(0)),
 210         dump_register(GEVNTSIZ(0)),
 211         dump_register(GEVNTCOUNT(0)),
 212
 213         dump_register(GHWPARAMS8),
 214         dump_register(DCFG),
 215         dump_register(DCTL),
 216         dump_register(DEVTEN),
 217         dump_register(DSTS),
 218         dump_register(DGCMDPAR),
 219         dump_register(DGCMD),
 220         dump_register(DALEPENA),
 221
 222         dump_register(DEPCMDPAR2(0)),
 223         dump_register(DEPCMDPAR2(1)),
 224         dump_register(DEPCMDPAR2(2)),
 225         dump_register(DEPCMDPAR2(3)),
 226         dump_register(DEPCMDPAR2(4)),
 227         dump_register(DEPCMDPAR2(5)),
 228         dump_register(DEPCMDPAR2(6)),
 229         dump_register(DEPCMDPAR2(7)),
 230         dump_register(DEPCMDPAR2(8)),
 231         dump_register(DEPCMDPAR2(9)),
 232         dump_register(DEPCMDPAR2(10)),
 233         dump_register(DEPCMDPAR2(11)),
 234         dump_register(DEPCMDPAR2(12)),
 235         dump_register(DEPCMDPAR2(13)),
 236         dump_register(DEPCMDPAR2(14)),
 237         dump_register(DEPCMDPAR2(15)),
 238         dump_register(DEPCMDPAR2(16)),
 239         dump_register(DEPCMDPAR2(17)),
 240         dump_register(DEPCMDPAR2(18)),
 241         dump_register(DEPCMDPAR2(19)),
 242         dump_register(DEPCMDPAR2(20)),
 243         dump_register(DEPCMDPAR2(21)),
 244         dump_register(DEPCMDPAR2(22)),
 245         dump_register(DEPCMDPAR2(23)),
 246         dump_register(DEPCMDPAR2(24)),
 247         dump_register(DEPCMDPAR2(25)),
 248         dump_register(DEPCMDPAR2(26)),
 249         dump_register(DEPCMDPAR2(27)),
 250         dump_register(DEPCMDPAR2(28)),
 251         dump_register(DEPCMDPAR2(29)),
 252         dump_register(DEPCMDPAR2(30)),
 253         dump_register(DEPCMDPAR2(31)),
 254
 255         dump_register(DEPCMDPAR1(0)),
 256         dump_register(DEPCMDPAR1(1)),
 257         dump_register(DEPCMDPAR1(2)),
 258         dump_register(DEPCMDPAR1(3)),
 259         dump_register(DEPCMDPAR1(4)),
 260         dump_register(DEPCMDPAR1(5)),
 261         dump_register(DEPCMDPAR1(6)),
 262         dump_register(DEPCMDPAR1(7)),
 263         dump_register(DEPCMDPAR1(8)),
 264         dump_register(DEPCMDPAR1(9)),
 265         dump_register(DEPCMDPAR1(10)),
 266         dump_register(DEPCMDPAR1(11)),
 267         dump_register(DEPCMDPAR1(12)),
 268         dump_register(DEPCMDPAR1(13)),
 269         dump_register(DEPCMDPAR1(14)),
 270         dump_register(DEPCMDPAR1(15)),
 271         dump_register(DEPCMDPAR1(16)),
 272         dump_register(DEPCMDPAR1(17)),
 273         dump_register(DEPCMDPAR1(18)),
 274         dump_register(DEPCMDPAR1(19)),
 275         dump_register(DEPCMDPAR1(20)),
 276         dump_register(DEPCMDPAR1(21)),
 277         dump_register(DEPCMDPAR1(22)),
 278         dump_register(DEPCMDPAR1(23)),
 279         dump_register(DEPCMDPAR1(24)),
 280         dump_register(DEPCMDPAR1(25)),
 281         dump_register(DEPCMDPAR1(26)),
 282         dump_register(DEPCMDPAR1(27)),
 283         dump_register(DEPCMDPAR1(28)),
 284         dump_register(DEPCMDPAR1(29)),
 285         dump_register(DEPCMDPAR1(30)),
 286         dump_register(DEPCMDPAR1(31)),
 287
 288         dump_register(DEPCMDPAR0(0)),
 289         dump_register(DEPCMDPAR0(1)),
 290         dump_register(DEPCMDPAR0(2)),
 291         dump_register(DEPCMDPAR0(3)),
 292         dump_register(DEPCMDPAR0(4)),
 293         dump_register(DEPCMDPAR0(5)),
 294         dump_register(DEPCMDPAR0(6)),
 295         dump_register(DEPCMDPAR0(7)),
 296         dump_register(DEPCMDPAR0(8)),
 297         dump_register(DEPCMDPAR0(9)),
 298         dump_register(DEPCMDPAR0(10)),
 299         dump_register(DEPCMDPAR0(11)),
 300         dump_register(DEPCMDPAR0(12)),
 301         dump_register(DEPCMDPAR0(13)),
 302         dump_register(DEPCMDPAR0(14)),
 303         dump_register(DEPCMDPAR0(15)),
 304         dump_register(DEPCMDPAR0(16)),
 305         dump_register(DEPCMDPAR0(17)),
 306         dump_register(DEPCMDPAR0(18)),
 307         dump_register(DEPCMDPAR0(19)),
 308         dump_register(DEPCMDPAR0(20)),
 309         dump_register(DEPCMDPAR0(21)),
 310         dump_register(DEPCMDPAR0(22)),
 311         dump_register(DEPCMDPAR0(23)),
 312         dump_register(DEPCMDPAR0(24)),
 313         dump_register(DEPCMDPAR0(25)),
 314         dump_register(DEPCMDPAR0(26)),
 315         dump_register(DEPCMDPAR0(27)),
 316         dump_register(DEPCMDPAR0(28)),
 317         dump_register(DEPCMDPAR0(29)),
 318         dump_register(DEPCMDPAR0(30)),
 319         dump_register(DEPCMDPAR0(31)),
 320
 321         dump_register(DEPCMD(0)),
 322         dump_register(DEPCMD(1)),
 323         dump_register(DEPCMD(2)),
 324         dump_register(DEPCMD(3)),
 325         dump_register(DEPCMD(4)),
 326         dump_register(DEPCMD(5)),
 327         dump_register(DEPCMD(6)),
 328         dump_register(DEPCMD(7)),
 329         dump_register(DEPCMD(8)),
 330         dump_register(DEPCMD(9)),
 331         dump_register(DEPCMD(10)),
 332         dump_register(DEPCMD(11)),
 333         dump_register(DEPCMD(12)),
 334         dump_register(DEPCMD(13)),
 335         dump_register(DEPCMD(14)),
 336         dump_register(DEPCMD(15)),
 337         dump_register(DEPCMD(16)),
 338         dump_register(DEPCMD(17)),
 339         dump_register(DEPCMD(18)),
 340         dump_register(DEPCMD(19)),
 341         dump_register(DEPCMD(20)),
 342         dump_register(DEPCMD(21)),
 343         dump_register(DEPCMD(22)),
 344         dump_register(DEPCMD(23)),
 345         dump_register(DEPCMD(24)),
 346         dump_register(DEPCMD(25)),
 347         dump_register(DEPCMD(26)),
 348         dump_register(DEPCMD(27)),
 349         dump_register(DEPCMD(28)),
 350         dump_register(DEPCMD(29)),
 351         dump_register(DEPCMD(30)),
 352         dump_register(DEPCMD(31)),
 353
 354         dump_register(OCFG),
 355         dump_register(OCTL),
 356         dump_register(OEVT),
 357         dump_register(OEVTEN),
 358         dump_register(OSTS),
 359 };
 360
 361 static int dwc3_mode_show(struct seq_file *s, void *unused)
 362 {
 363         struct dwc3             *dwc = s->private;
 364         unsigned long           flags;
 365         u32                     reg;
 366
 367         spin_lock_irqsave(&dwc->lock, flags);
 368         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 369         spin_unlock_irqrestore(&dwc->lock, flags);
 370
 371         switch (DWC3_GCTL_PRTCAP(reg)) {
 372         case DWC3_GCTL_PRTCAP_HOST:
 373                 seq_printf(s, "host\n");
 374                 break;
 375         case DWC3_GCTL_PRTCAP_DEVICE:
 376                 seq_printf(s, "device\n");
 377                 break;
 378         case DWC3_GCTL_PRTCAP_OTG:
 379                 seq_printf(s, "OTG\n");
 380                 break;
 381         default:
 382                 seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
 383         }
 384
 385         return 0;
 386 }
 387
 388 static int dwc3_mode_open(struct inode *inode, struct file *file)
 389 {
 390         return single_open(file, dwc3_mode_show, inode->i_private);
 391 }
 392
 393 static ssize_t dwc3_mode_write(struct file *file,
 394                 const char __user *ubuf, size_t count, loff_t *ppos)
 395 {
 396         struct seq_file         *s = file->private_data;
 397         struct dwc3             *dwc = s->private;
 398         unsigned long           flags;
 399         u32                     mode = 0;
 400         char                    buf[32];
 401
 402         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 403                 return -EFAULT;
 404
 405         if (!strncmp(buf, "host", 4)) {
 406                 mode |= DWC3_GCTL_PRTCAP_HOST;
 407                 dwc3_force_mode(dwc, mode);
 408                 return count;
 409         }
 410
 411         if (!strncmp(buf, "device", 6)) {
 412                 mode |= DWC3_GCTL_PRTCAP_DEVICE;
 413                 dwc3_force_mode(dwc, mode);
 414                 return count;
 415         }
 416
 417         if (!strncmp(buf, "otg", 3))
 418                 mode |= DWC3_GCTL_PRTCAP_OTG;
 419
 420         if (mode) {
 421                 spin_lock_irqsave(&dwc->lock, flags);
 422                 dwc3_set_mode(dwc, mode);
 423                 spin_unlock_irqrestore(&dwc->lock, flags);
 424         }
 425         return count;
 426 }
 427
 428 static const struct file_operations dwc3_mode_fops = {
 429         .open                   = dwc3_mode_open,
 430         .write                  = dwc3_mode_write,
 431         .read                   = seq_read,
 432         .llseek                 = seq_lseek,
 433         .release                = single_release,
 434 };
 435
 436 static int dwc3_testmode_show(struct seq_file *s, void *unused)
 437 {
 438         struct dwc3             *dwc = s->private;
 439         unsigned long           flags;
 440         u32                     reg;
 441
 442         spin_lock_irqsave(&dwc->lock, flags);
 443         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 444         reg &= DWC3_DCTL_TSTCTRL_MASK;
 445         reg >>= 1;
 446         spin_unlock_irqrestore(&dwc->lock, flags);
 447
 448         switch (reg) {
 449         case 0:
 450                 seq_printf(s, "no test\n");
 451                 break;
 452         case TEST_J:
 453                 seq_printf(s, "test_j\n");
 454                 break;
 455         case TEST_K:
 456                 seq_printf(s, "test_k\n");
 457                 break;
 458         case TEST_SE0_NAK:
 459                 seq_printf(s, "test_se0_nak\n");
 460                 break;
 461         case TEST_PACKET:
 462                 seq_printf(s, "test_packet\n");
 463                 break;
 464         case TEST_FORCE_EN:
 465                 seq_printf(s, "test_force_enable\n");
 466                 break;
 467         default:
 468                 seq_printf(s, "UNKNOWN %d\n", reg);
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int dwc3_testmode_open(struct inode *inode, struct file *file)
 475 {
 476         return single_open(file, dwc3_testmode_show, inode->i_private);
 477 }
 478
 479 static ssize_t dwc3_testmode_write(struct file *file,
 480                 const char __user *ubuf, size_t count, loff_t *ppos)
 481 {
 482         struct seq_file         *s = file->private_data;
 483         struct dwc3             *dwc = s->private;
 484         unsigned long           flags;
 485         u32                     testmode = 0;
 486         char                    buf[32];
 487
 488         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 489                 return -EFAULT;
 490
 491         if (!strncmp(buf, "test_j", 6))
 492                 testmode = TEST_J;
 493         else if (!strncmp(buf, "test_k", 6))
 494                 testmode = TEST_K;
 495         else if (!strncmp(buf, "test_se0_nak", 12))
 496                 testmode = TEST_SE0_NAK;
 497         else if (!strncmp(buf, "test_packet", 11))
 498                 testmode = TEST_PACKET;
 499         else if (!strncmp(buf, "test_force_enable", 17))
 500                 testmode = TEST_FORCE_EN;
 501         else
 502                 testmode = 0;
 503
 504         spin_lock_irqsave(&dwc->lock, flags);
 505         dwc3_gadget_set_test_mode(dwc, testmode);
 506         spin_unlock_irqrestore(&dwc->lock, flags);
 507
 508         return count;
 509 }
 510
 511 static const struct file_operations dwc3_testmode_fops = {
 512         .open                   = dwc3_testmode_open,
 513         .write                  = dwc3_testmode_write,
 514         .read                   = seq_read,
 515         .llseek                 = seq_lseek,
 516         .release                = single_release,
 517 };
 518
 519 static int dwc3_link_state_show(struct seq_file *s, void *unused)
 520 {
 521         struct dwc3             *dwc = s->private;
 522         unsigned long           flags;
 523         enum dwc3_link_state    state;
 524         u32                     reg;
 525
 526         spin_lock_irqsave(&dwc->lock, flags);
 527         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 528         state = DWC3_DSTS_USBLNKST(reg);
 529         spin_unlock_irqrestore(&dwc->lock, flags);
 530
 531         switch (state) {
 532         case DWC3_LINK_STATE_U0:
 533                 seq_printf(s, "U0\n");
 534                 break;
 535         case DWC3_LINK_STATE_U1:
 536                 seq_printf(s, "U1\n");
 537                 break;
 538         case DWC3_LINK_STATE_U2:
 539                 seq_printf(s, "U2\n");
 540                 break;
 541         case DWC3_LINK_STATE_U3:
 542                 seq_printf(s, "U3\n");
 543                 break;
 544         case DWC3_LINK_STATE_SS_DIS:
 545                 seq_printf(s, "SS.Disabled\n");
 546                 break;
 547         case DWC3_LINK_STATE_RX_DET:
 548                 seq_printf(s, "Rx.Detect\n");
 549                 break;
 550         case DWC3_LINK_STATE_SS_INACT:
 551                 seq_printf(s, "SS.Inactive\n");
 552                 break;
 553         case DWC3_LINK_STATE_POLL:
 554                 seq_printf(s, "Poll\n");
 555                 break;
 556         case DWC3_LINK_STATE_RECOV:
 557                 seq_printf(s, "Recovery\n");
 558                 break;
 559         case DWC3_LINK_STATE_HRESET:
 560                 seq_printf(s, "HRESET\n");
 561                 break;
 562         case DWC3_LINK_STATE_CMPLY:
 563                 seq_printf(s, "Compliance\n");
 564                 break;
 565         case DWC3_LINK_STATE_LPBK:
 566                 seq_printf(s, "Loopback\n");
 567                 break;
 568         case DWC3_LINK_STATE_RESET:
 569                 seq_printf(s, "Reset\n");
 570                 break;
 571         case DWC3_LINK_STATE_RESUME:
 572                 seq_printf(s, "Resume\n");
 573                 break;
 574         default:
 575                 seq_printf(s, "UNKNOWN %d\n", state);
 576         }
 577
 578         return 0;
 579 }
 580
 581 static int dwc3_link_state_open(struct inode *inode, struct file *file)
 582 {
 583         return single_open(file, dwc3_link_state_show, inode->i_private);
 584 }
 585
 586 static ssize_t dwc3_link_state_write(struct file *file,
 587                 const char __user *ubuf, size_t count, loff_t *ppos)
 588 {
 589         struct seq_file         *s = file->private_data;
 590         struct dwc3             *dwc = s->private;
 591         unsigned long           flags;
 592         enum dwc3_link_state    state = 0;
 593         char                    buf[32];
 594
 595         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 596                 return -EFAULT;
 597
 598         if (!strncmp(buf, "SS.Disabled", 11))
 599                 state = DWC3_LINK_STATE_SS_DIS;
 600         else if (!strncmp(buf, "Rx.Detect", 9))
 601                 state = DWC3_LINK_STATE_RX_DET;
 602         else if (!strncmp(buf, "SS.Inactive", 11))
 603                 state = DWC3_LINK_STATE_SS_INACT;
 604         else if (!strncmp(buf, "Recovery", 8))
 605                 state = DWC3_LINK_STATE_RECOV;
 606         else if (!strncmp(buf, "Compliance", 10))
 607                 state = DWC3_LINK_STATE_CMPLY;
 608         else if (!strncmp(buf, "Loopback", 8))
 609                 state = DWC3_LINK_STATE_LPBK;
 610         else
 611                 return -EINVAL;
 612
 613         spin_lock_irqsave(&dwc->lock, flags);
 614         dwc3_gadget_set_link_state(dwc, state);
 615         spin_unlock_irqrestore(&dwc->lock, flags);
 616
 617         return count;
 618 }
 619
 620 static const struct file_operations dwc3_link_state_fops = {
 621         .open                   = dwc3_link_state_open,
 622         .write                  = dwc3_link_state_write,
 623         .read                   = seq_read,
 624         .llseek                 = seq_lseek,
 625         .release                = single_release,
 626 };
 627
 628 int dwc3_debugfs_init(struct dwc3 *dwc)
 629 {
 630         struct dentry           *root;
 631         struct dentry           *file;
 632         int                     ret;
 633
 634         root = debugfs_create_dir(dev_name(dwc->dev), NULL);
 635         if (!root) {
 636                 ret = -ENOMEM;
 637                 goto err0;
 638         }
 639
 640         dwc->root = root;
 641
 642         dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
 643         if (!dwc->regset) {
 644                 ret = -ENOMEM;
 645                 goto err1;
 646         }
 647
 648         dwc->regset->regs = dwc3_regs;
 649         dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
 650         dwc->regset->base = dwc->regs;
 651
 652         file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
 653         if (!file) {
 654                 ret = -ENOMEM;
 655                 goto err1;
 656         }
 657
 658         if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
 659                 file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
 660                                 dwc, &dwc3_mode_fops);
 661                 if (!file) {
 662                         ret = -ENOMEM;
 663                         goto err1;
 664                 }
 665         }
 666
 667         if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) ||
 668                         IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
 669                 file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root,
 670                                 dwc, &dwc3_testmode_fops);
 671                 if (!file) {
 672                         ret = -ENOMEM;
 673                         goto err1;
 674                 }
 675
 676                 file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root,
 677                                 dwc, &dwc3_link_state_fops);
 678                 if (!file) {
 679                         ret = -ENOMEM;
 680                         goto err1;
 681                 }
 682         }
 683
 684         return 0;
 685
 686 err1:
 687         debugfs_remove_recursive(root);
 688
 689 err0:
 690         return ret;
 691 }
 692
 693 void dwc3_debugfs_exit(struct dwc3 *dwc)
 694 {
 695         debugfs_remove_recursive(dwc->root);
 696         dwc->root = NULL;
 697 }