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, \ 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(OEVTEN), 376 dump_register(OSTS), 377 }; 378 379 static int dwc3_regdump_show(struct seq_file *s, void *unused) 380 { 381 struct dwc3 *dwc = s->private; 382 383 seq_printf(s, "DesignWare USB3 Core Register Dump\n"); 384 debugfs_print_regs32(s, dwc3_regs, ARRAY_SIZE(dwc3_regs), 385 dwc->regs, ""); 386 return 0; 387 } 388 389 static int dwc3_regdump_open(struct inode *inode, struct file *file) 390 { 391 return single_open(file, dwc3_regdump_show, inode->i_private); 392 } 393 394 static const struct file_operations dwc3_regdump_fops = { 395 .open = dwc3_regdump_open, 396 .read = seq_read, 397 .release = single_release, 398 }; 399 400 static int dwc3_mode_show(struct seq_file *s, void *unused) 401 { 402 struct dwc3 *dwc = s->private; 403 unsigned long flags; 404 u32 reg; 405 406 spin_lock_irqsave(&dwc->lock, flags); 407 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 408 spin_unlock_irqrestore(&dwc->lock, flags); 409 410 switch (DWC3_GCTL_PRTCAP(reg)) { 411 case DWC3_GCTL_PRTCAP_HOST: 412 seq_printf(s, "host\n"); 413 break; 414 case DWC3_GCTL_PRTCAP_DEVICE: 415 seq_printf(s, "device\n"); 416 break; 417 case DWC3_GCTL_PRTCAP_OTG: 418 seq_printf(s, "OTG\n"); 419 break; 420 default: 421 seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg)); 422 } 423 424 return 0; 425 } 426 427 static int dwc3_mode_open(struct inode *inode, struct file *file) 428 { 429 return single_open(file, dwc3_mode_show, inode->i_private); 430 } 431 432 static ssize_t dwc3_mode_write(struct file *file, 433 const char __user *ubuf, size_t count, loff_t *ppos) 434 { 435 struct seq_file *s = file->private_data; 436 struct dwc3 *dwc = s->private; 437 unsigned long flags; 438 u32 mode = 0; 439 char buf[32]; 440 441 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) 442 return -EFAULT; 443 444 if (!strncmp(buf, "host", 4)) 445 mode |= DWC3_GCTL_PRTCAP_HOST; 446 447 if (!strncmp(buf, "device", 6)) 448 mode |= DWC3_GCTL_PRTCAP_DEVICE; 449 450 if (!strncmp(buf, "otg", 3)) 451 mode |= DWC3_GCTL_PRTCAP_OTG; 452 453 if (mode) { 454 spin_lock_irqsave(&dwc->lock, flags); 455 dwc3_set_mode(dwc, mode); 456 spin_unlock_irqrestore(&dwc->lock, flags); 457 } 458 return count; 459 } 460 461 static const struct file_operations dwc3_mode_fops = { 462 .open = dwc3_mode_open, 463 .write = dwc3_mode_write, 464 .read = seq_read, 465 .llseek = seq_lseek, 466 .release = single_release, 467 }; 468 469 static int dwc3_testmode_show(struct seq_file *s, void *unused) 470 { 471 struct dwc3 *dwc = s->private; 472 unsigned long flags; 473 u32 reg; 474 475 spin_lock_irqsave(&dwc->lock, flags); 476 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 477 reg &= DWC3_DCTL_TSTCTRL_MASK; 478 reg >>= 1; 479 spin_unlock_irqrestore(&dwc->lock, flags); 480 481 switch (reg) { 482 case 0: 483 seq_printf(s, "no test\n"); 484 break; 485 case TEST_J: 486 seq_printf(s, "test_j\n"); 487 break; 488 case TEST_K: 489 seq_printf(s, "test_k\n"); 490 break; 491 case TEST_SE0_NAK: 492 seq_printf(s, "test_se0_nak\n"); 493 break; 494 case TEST_PACKET: 495 seq_printf(s, "test_packet\n"); 496 break; 497 case TEST_FORCE_EN: 498 seq_printf(s, "test_force_enable\n"); 499 break; 500 default: 501 seq_printf(s, "UNKNOWN %d\n", reg); 502 } 503 504 return 0; 505 } 506 507 static int dwc3_testmode_open(struct inode *inode, struct file *file) 508 { 509 return single_open(file, dwc3_testmode_show, inode->i_private); 510 } 511 512 static ssize_t dwc3_testmode_write(struct file *file, 513 const char __user *ubuf, size_t count, loff_t *ppos) 514 { 515 struct seq_file *s = file->private_data; 516 struct dwc3 *dwc = s->private; 517 unsigned long flags; 518 u32 testmode = 0; 519 char buf[32]; 520 521 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) 522 return -EFAULT; 523 524 if (!strncmp(buf, "test_j", 6)) 525 testmode = TEST_J; 526 else if (!strncmp(buf, "test_k", 6)) 527 testmode = TEST_K; 528 else if (!strncmp(buf, "test_se0_nak", 12)) 529 testmode = TEST_SE0_NAK; 530 else if (!strncmp(buf, "test_packet", 11)) 531 testmode = TEST_PACKET; 532 else if (!strncmp(buf, "test_force_enable", 17)) 533 testmode = TEST_FORCE_EN; 534 else 535 testmode = 0; 536 537 spin_lock_irqsave(&dwc->lock, flags); 538 dwc3_gadget_set_test_mode(dwc, testmode); 539 spin_unlock_irqrestore(&dwc->lock, flags); 540 541 return count; 542 } 543 544 static const struct file_operations dwc3_testmode_fops = { 545 .open = dwc3_testmode_open, 546 .write = dwc3_testmode_write, 547 .read = seq_read, 548 .llseek = seq_lseek, 549 .release = single_release, 550 }; 551 552 static int dwc3_link_state_show(struct seq_file *s, void *unused) 553 { 554 struct dwc3 *dwc = s->private; 555 unsigned long flags; 556 enum dwc3_link_state state; 557 u32 reg; 558 559 spin_lock_irqsave(&dwc->lock, flags); 560 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 561 state = DWC3_DSTS_USBLNKST(reg); 562 spin_unlock_irqrestore(&dwc->lock, flags); 563 564 switch (state) { 565 case DWC3_LINK_STATE_U0: 566 seq_printf(s, "U0\n"); 567 break; 568 case DWC3_LINK_STATE_U1: 569 seq_printf(s, "U1\n"); 570 break; 571 case DWC3_LINK_STATE_U2: 572 seq_printf(s, "U2\n"); 573 break; 574 case DWC3_LINK_STATE_U3: 575 seq_printf(s, "U3\n"); 576 break; 577 case DWC3_LINK_STATE_SS_DIS: 578 seq_printf(s, "SS.Disabled\n"); 579 break; 580 case DWC3_LINK_STATE_RX_DET: 581 seq_printf(s, "Rx.Detect\n"); 582 break; 583 case DWC3_LINK_STATE_SS_INACT: 584 seq_printf(s, "SS.Inactive\n"); 585 break; 586 case DWC3_LINK_STATE_POLL: 587 seq_printf(s, "Poll\n"); 588 break; 589 case DWC3_LINK_STATE_RECOV: 590 seq_printf(s, "Recovery\n"); 591 break; 592 case DWC3_LINK_STATE_HRESET: 593 seq_printf(s, "HRESET\n"); 594 break; 595 case DWC3_LINK_STATE_CMPLY: 596 seq_printf(s, "Compliance\n"); 597 break; 598 case DWC3_LINK_STATE_LPBK: 599 seq_printf(s, "Loopback\n"); 600 break; 601 default: 602 seq_printf(s, "UNKNOWN %d\n", reg); 603 } 604 605 return 0; 606 } 607 608 static int dwc3_link_state_open(struct inode *inode, struct file *file) 609 { 610 return single_open(file, dwc3_link_state_show, inode->i_private); 611 } 612 613 static ssize_t dwc3_link_state_write(struct file *file, 614 const char __user *ubuf, size_t count, loff_t *ppos) 615 { 616 struct seq_file *s = file->private_data; 617 struct dwc3 *dwc = s->private; 618 unsigned long flags; 619 enum dwc3_link_state state = 0; 620 char buf[32]; 621 622 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) 623 return -EFAULT; 624 625 if (!strncmp(buf, "SS.Disabled", 11)) 626 state = DWC3_LINK_STATE_SS_DIS; 627 else if (!strncmp(buf, "Rx.Detect", 9)) 628 state = DWC3_LINK_STATE_RX_DET; 629 else if (!strncmp(buf, "SS.Inactive", 11)) 630 state = DWC3_LINK_STATE_SS_INACT; 631 else if (!strncmp(buf, "Recovery", 8)) 632 state = DWC3_LINK_STATE_RECOV; 633 else if (!strncmp(buf, "Compliance", 10)) 634 state = DWC3_LINK_STATE_CMPLY; 635 else if (!strncmp(buf, "Loopback", 8)) 636 state = DWC3_LINK_STATE_LPBK; 637 else 638 return -EINVAL; 639 640 spin_lock_irqsave(&dwc->lock, flags); 641 dwc3_gadget_set_link_state(dwc, state); 642 spin_unlock_irqrestore(&dwc->lock, flags); 643 644 return count; 645 } 646 647 static const struct file_operations dwc3_link_state_fops = { 648 .open = dwc3_link_state_open, 649 .write = dwc3_link_state_write, 650 .read = seq_read, 651 .llseek = seq_lseek, 652 .release = single_release, 653 }; 654 655 int dwc3_debugfs_init(struct dwc3 *dwc) 656 { 657 struct dentry *root; 658 struct dentry *file; 659 int ret; 660 661 root = debugfs_create_dir(dev_name(dwc->dev), NULL); 662 if (!root) { 663 ret = -ENOMEM; 664 goto err0; 665 } 666 667 dwc->root = root; 668 669 file = debugfs_create_file("regdump", S_IRUGO, root, dwc, 670 &dwc3_regdump_fops); 671 if (!file) { 672 ret = -ENOMEM; 673 goto err1; 674 } 675 676 file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root, 677 dwc, &dwc3_mode_fops); 678 if (!file) { 679 ret = -ENOMEM; 680 goto err1; 681 } 682 683 file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root, 684 dwc, &dwc3_testmode_fops); 685 if (!file) { 686 ret = -ENOMEM; 687 goto err1; 688 } 689 690 file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root, 691 dwc, &dwc3_link_state_fops); 692 if (!file) { 693 ret = -ENOMEM; 694 goto err1; 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 } 711