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  * 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>
  47 #include <linux/uaccess.h>
  48
  49 #include <linux/usb/ch9.h>
  50
  51 #include "core.h"
  52 #include "gadget.h"
  53 #include "io.h"
  54 #include "debug.h"
  55
  56 #define dump_register(nm)                               \
  57 {                                                       \
  58         .name   = __stringify(nm),                      \
  59         .offset = DWC3_ ##nm - DWC3_GLOBALS_REGS_START, \
  60 }
  61
  62 static const struct debugfs_reg32 dwc3_regs[] = {
  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(OEVT),
 376         dump_register(OEVTEN),
 377         dump_register(OSTS),
 378 };
 379
 380 static int dwc3_mode_show(struct seq_file *s, void *unused)
 381 {
 382         struct dwc3             *dwc = s->private;
 383         unsigned long           flags;
 384         u32                     reg;
 385
 386         spin_lock_irqsave(&dwc->lock, flags);
 387         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 388         spin_unlock_irqrestore(&dwc->lock, flags);
 389
 390         switch (DWC3_GCTL_PRTCAP(reg)) {
 391         case DWC3_GCTL_PRTCAP_HOST:
 392                 seq_printf(s, "host\n");
 393                 break;
 394         case DWC3_GCTL_PRTCAP_DEVICE:
 395                 seq_printf(s, "device\n");
 396                 break;
 397         case DWC3_GCTL_PRTCAP_OTG:
 398                 seq_printf(s, "OTG\n");
 399                 break;
 400         default:
 401                 seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int dwc3_mode_open(struct inode *inode, struct file *file)
 408 {
 409         return single_open(file, dwc3_mode_show, inode->i_private);
 410 }
 411
 412 static ssize_t dwc3_mode_write(struct file *file,
 413                 const char __user *ubuf, size_t count, loff_t *ppos)
 414 {
 415         struct seq_file         *s = file->private_data;
 416         struct dwc3             *dwc = s->private;
 417         unsigned long           flags;
 418         u32                     mode = 0;
 419         char                    buf[32];
 420
 421         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 422                 return -EFAULT;
 423
 424         if (!strncmp(buf, "host", 4))
 425                 mode |= DWC3_GCTL_PRTCAP_HOST;
 426
 427         if (!strncmp(buf, "device", 6))
 428                 mode |= DWC3_GCTL_PRTCAP_DEVICE;
 429
 430         if (!strncmp(buf, "otg", 3))
 431                 mode |= DWC3_GCTL_PRTCAP_OTG;
 432
 433         if (mode) {
 434                 spin_lock_irqsave(&dwc->lock, flags);
 435                 dwc3_set_mode(dwc, mode);
 436                 spin_unlock_irqrestore(&dwc->lock, flags);
 437         }
 438         return count;
 439 }
 440
 441 static const struct file_operations dwc3_mode_fops = {
 442         .open                   = dwc3_mode_open,
 443         .write                  = dwc3_mode_write,
 444         .read                   = seq_read,
 445         .llseek                 = seq_lseek,
 446         .release                = single_release,
 447 };
 448
 449 static int dwc3_testmode_show(struct seq_file *s, void *unused)
 450 {
 451         struct dwc3             *dwc = s->private;
 452         unsigned long           flags;
 453         u32                     reg;
 454
 455         spin_lock_irqsave(&dwc->lock, flags);
 456         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 457         reg &= DWC3_DCTL_TSTCTRL_MASK;
 458         reg >>= 1;
 459         spin_unlock_irqrestore(&dwc->lock, flags);
 460
 461         switch (reg) {
 462         case 0:
 463                 seq_printf(s, "no test\n");
 464                 break;
 465         case TEST_J:
 466                 seq_printf(s, "test_j\n");
 467                 break;
 468         case TEST_K:
 469                 seq_printf(s, "test_k\n");
 470                 break;
 471         case TEST_SE0_NAK:
 472                 seq_printf(s, "test_se0_nak\n");
 473                 break;
 474         case TEST_PACKET:
 475                 seq_printf(s, "test_packet\n");
 476                 break;
 477         case TEST_FORCE_EN:
 478                 seq_printf(s, "test_force_enable\n");
 479                 break;
 480         default:
 481                 seq_printf(s, "UNKNOWN %d\n", reg);
 482         }
 483
 484         return 0;
 485 }
 486
 487 static int dwc3_testmode_open(struct inode *inode, struct file *file)
 488 {
 489         return single_open(file, dwc3_testmode_show, inode->i_private);
 490 }
 491
 492 static ssize_t dwc3_testmode_write(struct file *file,
 493                 const char __user *ubuf, size_t count, loff_t *ppos)
 494 {
 495         struct seq_file         *s = file->private_data;
 496         struct dwc3             *dwc = s->private;
 497         unsigned long           flags;
 498         u32                     testmode = 0;
 499         char                    buf[32];
 500
 501         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 502                 return -EFAULT;
 503
 504         if (!strncmp(buf, "test_j", 6))
 505                 testmode = TEST_J;
 506         else if (!strncmp(buf, "test_k", 6))
 507                 testmode = TEST_K;
 508         else if (!strncmp(buf, "test_se0_nak", 12))
 509                 testmode = TEST_SE0_NAK;
 510         else if (!strncmp(buf, "test_packet", 11))
 511                 testmode = TEST_PACKET;
 512         else if (!strncmp(buf, "test_force_enable", 17))
 513                 testmode = TEST_FORCE_EN;
 514         else
 515                 testmode = 0;
 516
 517         spin_lock_irqsave(&dwc->lock, flags);
 518         dwc3_gadget_set_test_mode(dwc, testmode);
 519         spin_unlock_irqrestore(&dwc->lock, flags);
 520
 521         return count;
 522 }
 523
 524 static const struct file_operations dwc3_testmode_fops = {
 525         .open                   = dwc3_testmode_open,
 526         .write                  = dwc3_testmode_write,
 527         .read                   = seq_read,
 528         .llseek                 = seq_lseek,
 529         .release                = single_release,
 530 };
 531
 532 static int dwc3_link_state_show(struct seq_file *s, void *unused)
 533 {
 534         struct dwc3             *dwc = s->private;
 535         unsigned long           flags;
 536         enum dwc3_link_state    state;
 537         u32                     reg;
 538
 539         spin_lock_irqsave(&dwc->lock, flags);
 540         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 541         state = DWC3_DSTS_USBLNKST(reg);
 542         spin_unlock_irqrestore(&dwc->lock, flags);
 543
 544         switch (state) {
 545         case DWC3_LINK_STATE_U0:
 546                 seq_printf(s, "U0\n");
 547                 break;
 548         case DWC3_LINK_STATE_U1:
 549                 seq_printf(s, "U1\n");
 550                 break;
 551         case DWC3_LINK_STATE_U2:
 552                 seq_printf(s, "U2\n");
 553                 break;
 554         case DWC3_LINK_STATE_U3:
 555                 seq_printf(s, "U3\n");
 556                 break;
 557         case DWC3_LINK_STATE_SS_DIS:
 558                 seq_printf(s, "SS.Disabled\n");
 559                 break;
 560         case DWC3_LINK_STATE_RX_DET:
 561                 seq_printf(s, "Rx.Detect\n");
 562                 break;
 563         case DWC3_LINK_STATE_SS_INACT:
 564                 seq_printf(s, "SS.Inactive\n");
 565                 break;
 566         case DWC3_LINK_STATE_POLL:
 567                 seq_printf(s, "Poll\n");
 568                 break;
 569         case DWC3_LINK_STATE_RECOV:
 570                 seq_printf(s, "Recovery\n");
 571                 break;
 572         case DWC3_LINK_STATE_HRESET:
 573                 seq_printf(s, "HRESET\n");
 574                 break;
 575         case DWC3_LINK_STATE_CMPLY:
 576                 seq_printf(s, "Compliance\n");
 577                 break;
 578         case DWC3_LINK_STATE_LPBK:
 579                 seq_printf(s, "Loopback\n");
 580                 break;
 581         case DWC3_LINK_STATE_RESET:
 582                 seq_printf(s, "Reset\n");
 583                 break;
 584         case DWC3_LINK_STATE_RESUME:
 585                 seq_printf(s, "Resume\n");
 586                 break;
 587         default:
 588                 seq_printf(s, "UNKNOWN %d\n", state);
 589         }
 590
 591         return 0;
 592 }
 593
 594 static int dwc3_link_state_open(struct inode *inode, struct file *file)
 595 {
 596         return single_open(file, dwc3_link_state_show, inode->i_private);
 597 }
 598
 599 static ssize_t dwc3_link_state_write(struct file *file,
 600                 const char __user *ubuf, size_t count, loff_t *ppos)
 601 {
 602         struct seq_file         *s = file->private_data;
 603         struct dwc3             *dwc = s->private;
 604         unsigned long           flags;
 605         enum dwc3_link_state    state = 0;
 606         char                    buf[32];
 607
 608         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 609                 return -EFAULT;
 610
 611         if (!strncmp(buf, "SS.Disabled", 11))
 612                 state = DWC3_LINK_STATE_SS_DIS;
 613         else if (!strncmp(buf, "Rx.Detect", 9))
 614                 state = DWC3_LINK_STATE_RX_DET;
 615         else if (!strncmp(buf, "SS.Inactive", 11))
 616                 state = DWC3_LINK_STATE_SS_INACT;
 617         else if (!strncmp(buf, "Recovery", 8))
 618                 state = DWC3_LINK_STATE_RECOV;
 619         else if (!strncmp(buf, "Compliance", 10))
 620                 state = DWC3_LINK_STATE_CMPLY;
 621         else if (!strncmp(buf, "Loopback", 8))
 622                 state = DWC3_LINK_STATE_LPBK;
 623         else
 624                 return -EINVAL;
 625
 626         spin_lock_irqsave(&dwc->lock, flags);
 627         dwc3_gadget_set_link_state(dwc, state);
 628         spin_unlock_irqrestore(&dwc->lock, flags);
 629
 630         return count;
 631 }
 632
 633 static const struct file_operations dwc3_link_state_fops = {
 634         .open                   = dwc3_link_state_open,
 635         .write                  = dwc3_link_state_write,
 636         .read                   = seq_read,
 637         .llseek                 = seq_lseek,
 638         .release                = single_release,
 639 };
 640
 641 int dwc3_debugfs_init(struct dwc3 *dwc)
 642 {
 643         struct dentry           *root;
 644         struct dentry           *file;
 645         int                     ret;
 646
 647         root = debugfs_create_dir(dev_name(dwc->dev), NULL);
 648         if (!root) {
 649                 ret = -ENOMEM;
 650                 goto err0;
 651         }
 652
 653         dwc->root = root;
 654
 655         dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
 656         if (!dwc->regset) {
 657                 ret = -ENOMEM;
 658                 goto err1;
 659         }
 660
 661         dwc->regset->regs = dwc3_regs;
 662         dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
 663         dwc->regset->base = dwc->regs;
 664
 665         file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
 666         if (!file) {
 667                 ret = -ENOMEM;
 668                 goto err1;
 669         }
 670
 671         if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
 672                 file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
 673                                 dwc, &dwc3_mode_fops);
 674                 if (!file) {
 675                         ret = -ENOMEM;
 676                         goto err1;
 677                 }
 678         }
 679
 680         if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) ||
 681                         IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
 682                 file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root,
 683                                 dwc, &dwc3_testmode_fops);
 684                 if (!file) {
 685                         ret = -ENOMEM;
 686                         goto err1;
 687                 }
 688
 689                 file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root,
 690                                 dwc, &dwc3_link_state_fops);
 691                 if (!file) {
 692                         ret = -ENOMEM;
 693                         goto err1;
 694                 }
 695         }
 696
 697         return 0;
 698
 699 err1:
 700         debugfs_remove_recursive(root);
 701
 702 err0:
 703         return ret;
 704 }
 705
 706 void dwc3_debugfs_exit(struct dwc3 *dwc)
 707 {
 708         debugfs_remove_recursive(dwc->root);
 709         dwc->root = NULL;
 710 }