1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 5 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net> 6 * 7 * This file is licenced under GPL 8 */ 9 10 /*-------------------------------------------------------------------------*/ 11 12 /* 13 * OHCI Root Hub ... the nonsharable stuff 14 */ 15 16 #define dbg_port(hc,label,num,value) \ 17 ohci_dbg (hc, \ 18 "%s roothub.portstatus [%d] " \ 19 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \ 20 label, num, temp, \ 21 (temp & RH_PS_PRSC) ? " PRSC" : "", \ 22 (temp & RH_PS_OCIC) ? " OCIC" : "", \ 23 (temp & RH_PS_PSSC) ? " PSSC" : "", \ 24 (temp & RH_PS_PESC) ? " PESC" : "", \ 25 (temp & RH_PS_CSC) ? " CSC" : "", \ 26 \ 27 (temp & RH_PS_LSDA) ? " LSDA" : "", \ 28 (temp & RH_PS_PPS) ? " PPS" : "", \ 29 (temp & RH_PS_PRS) ? " PRS" : "", \ 30 (temp & RH_PS_POCI) ? " POCI" : "", \ 31 (temp & RH_PS_PSS) ? " PSS" : "", \ 32 \ 33 (temp & RH_PS_PES) ? " PES" : "", \ 34 (temp & RH_PS_CCS) ? " CCS" : "" \ 35 ); 36 37 /*-------------------------------------------------------------------------*/ 38 39 #ifdef CONFIG_PM 40 41 #define OHCI_SCHED_ENABLES \ 42 (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE) 43 44 static void dl_done_list (struct ohci_hcd *, struct pt_regs *); 45 static void finish_unlinks (struct ohci_hcd *, u16 , struct pt_regs *); 46 static int ohci_restart (struct ohci_hcd *ohci); 47 48 static int ohci_bus_suspend (struct usb_hcd *hcd) 49 { 50 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 51 int status = 0; 52 unsigned long flags; 53 54 spin_lock_irqsave (&ohci->lock, flags); 55 56 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) { 57 spin_unlock_irqrestore (&ohci->lock, flags); 58 return -ESHUTDOWN; 59 } 60 61 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 62 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 63 case OHCI_USB_RESUME: 64 ohci_dbg (ohci, "resume/suspend?\n"); 65 ohci->hc_control &= ~OHCI_CTRL_HCFS; 66 ohci->hc_control |= OHCI_USB_RESET; 67 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 68 (void) ohci_readl (ohci, &ohci->regs->control); 69 /* FALL THROUGH */ 70 case OHCI_USB_RESET: 71 status = -EBUSY; 72 ohci_dbg (ohci, "needs reinit!\n"); 73 goto done; 74 case OHCI_USB_SUSPEND: 75 ohci_dbg (ohci, "already suspended\n"); 76 goto done; 77 } 78 ohci_dbg (ohci, "suspend root hub\n"); 79 80 /* First stop any processing */ 81 if (ohci->hc_control & OHCI_SCHED_ENABLES) { 82 int limit; 83 84 ohci->hc_control &= ~OHCI_SCHED_ENABLES; 85 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 86 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 87 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus); 88 89 /* sched disables take effect on the next frame, 90 * then the last WDH could take 6+ msec 91 */ 92 ohci_dbg (ohci, "stopping schedules ...\n"); 93 limit = 2000; 94 while (limit > 0) { 95 udelay (250); 96 limit =- 250; 97 if (ohci_readl (ohci, &ohci->regs->intrstatus) 98 & OHCI_INTR_SF) 99 break; 100 } 101 dl_done_list (ohci, NULL); 102 mdelay (7); 103 } 104 dl_done_list (ohci, NULL); 105 finish_unlinks (ohci, ohci_frame_no(ohci), NULL); 106 ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus), 107 &ohci->regs->intrstatus); 108 109 /* maybe resume can wake root hub */ 110 if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev)) 111 ohci->hc_control |= OHCI_CTRL_RWE; 112 else 113 ohci->hc_control &= ~OHCI_CTRL_RWE; 114 115 /* Suspend hub ... this is the "global (to this bus) suspend" mode, 116 * which doesn't imply ports will first be individually suspended. 117 */ 118 ohci->hc_control &= ~OHCI_CTRL_HCFS; 119 ohci->hc_control |= OHCI_USB_SUSPEND; 120 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 121 (void) ohci_readl (ohci, &ohci->regs->control); 122 123 /* no resumes until devices finish suspending */ 124 ohci->next_statechange = jiffies + msecs_to_jiffies (5); 125 126 done: 127 /* external suspend vs self autosuspend ... same effect */ 128 if (status == 0) 129 usb_hcd_suspend_root_hub(hcd); 130 spin_unlock_irqrestore (&ohci->lock, flags); 131 return status; 132 } 133 134 static inline struct ed *find_head (struct ed *ed) 135 { 136 /* for bulk and control lists */ 137 while (ed->ed_prev) 138 ed = ed->ed_prev; 139 return ed; 140 } 141 142 /* caller has locked the root hub */ 143 static int ohci_bus_resume (struct usb_hcd *hcd) 144 { 145 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 146 u32 temp, enables; 147 int status = -EINPROGRESS; 148 unsigned long flags; 149 150 if (time_before (jiffies, ohci->next_statechange)) 151 msleep(5); 152 153 spin_lock_irqsave (&ohci->lock, flags); 154 155 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) { 156 spin_unlock_irqrestore (&ohci->lock, flags); 157 return -ESHUTDOWN; 158 } 159 160 161 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 162 163 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { 164 /* this can happen after resuming a swsusp snapshot */ 165 if (hcd->state == HC_STATE_RESUMING) { 166 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n", 167 ohci->hc_control); 168 status = -EBUSY; 169 /* this happens when pmcore resumes HC then root */ 170 } else { 171 ohci_dbg (ohci, "duplicate resume\n"); 172 status = 0; 173 } 174 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) { 175 case OHCI_USB_SUSPEND: 176 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES); 177 ohci->hc_control |= OHCI_USB_RESUME; 178 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 179 (void) ohci_readl (ohci, &ohci->regs->control); 180 ohci_dbg (ohci, "resume root hub\n"); 181 break; 182 case OHCI_USB_RESUME: 183 /* HCFS changes sometime after INTR_RD */ 184 ohci_info (ohci, "wakeup\n"); 185 break; 186 case OHCI_USB_OPER: 187 /* this can happen after resuming a swsusp snapshot */ 188 ohci_dbg (ohci, "snapshot resume? reinit\n"); 189 status = -EBUSY; 190 break; 191 default: /* RESET, we lost power */ 192 ohci_dbg (ohci, "lost power\n"); 193 status = -EBUSY; 194 } 195 spin_unlock_irqrestore (&ohci->lock, flags); 196 if (status == -EBUSY) { 197 (void) ohci_init (ohci); 198 return ohci_restart (ohci); 199 } 200 if (status != -EINPROGRESS) 201 return status; 202 203 temp = ohci->num_ports; 204 enables = 0; 205 while (temp--) { 206 u32 stat = ohci_readl (ohci, 207 &ohci->regs->roothub.portstatus [temp]); 208 209 /* force global, not selective, resume */ 210 if (!(stat & RH_PS_PSS)) 211 continue; 212 ohci_writel (ohci, RH_PS_POCI, 213 &ohci->regs->roothub.portstatus [temp]); 214 } 215 216 /* Some controllers (lucent erratum) need extra-long delays */ 217 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1); 218 219 temp = ohci_readl (ohci, &ohci->regs->control); 220 temp &= OHCI_CTRL_HCFS; 221 if (temp != OHCI_USB_RESUME) { 222 ohci_err (ohci, "controller won't resume\n"); 223 return -EBUSY; 224 } 225 226 /* disable old schedule state, reinit from scratch */ 227 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead); 228 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent); 229 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead); 230 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent); 231 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent); 232 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca); 233 234 /* Sometimes PCI D3 suspend trashes frame timings ... */ 235 periodic_reinit (ohci); 236 237 /* interrupts might have been disabled */ 238 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable); 239 if (ohci->ed_rm_list) 240 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable); 241 ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus), 242 &ohci->regs->intrstatus); 243 244 /* Then re-enable operations */ 245 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control); 246 (void) ohci_readl (ohci, &ohci->regs->control); 247 msleep (3); 248 249 temp = ohci->hc_control; 250 temp &= OHCI_CTRL_RWC; 251 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER; 252 ohci->hc_control = temp; 253 ohci_writel (ohci, temp, &ohci->regs->control); 254 (void) ohci_readl (ohci, &ohci->regs->control); 255 256 /* TRSMRCY */ 257 msleep (10); 258 259 /* keep it alive for ~5x suspend + resume costs */ 260 ohci->next_statechange = jiffies + msecs_to_jiffies (250); 261 262 /* maybe turn schedules back on */ 263 enables = 0; 264 temp = 0; 265 if (!ohci->ed_rm_list) { 266 if (ohci->ed_controltail) { 267 ohci_writel (ohci, 268 find_head (ohci->ed_controltail)->dma, 269 &ohci->regs->ed_controlhead); 270 enables |= OHCI_CTRL_CLE; 271 temp |= OHCI_CLF; 272 } 273 if (ohci->ed_bulktail) { 274 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma, 275 &ohci->regs->ed_bulkhead); 276 enables |= OHCI_CTRL_BLE; 277 temp |= OHCI_BLF; 278 } 279 } 280 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs) 281 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE; 282 if (enables) { 283 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables); 284 ohci->hc_control |= enables; 285 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 286 if (temp) 287 ohci_writel (ohci, temp, &ohci->regs->cmdstatus); 288 (void) ohci_readl (ohci, &ohci->regs->control); 289 } 290 291 return 0; 292 } 293 294 #endif /* CONFIG_PM */ 295 296 /*-------------------------------------------------------------------------*/ 297 298 /* build "status change" packet (one or two bytes) from HC registers */ 299 300 static int 301 ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 302 { 303 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 304 int i, changed = 0, length = 1; 305 int can_suspend = device_may_wakeup(&hcd->self.root_hub->dev); 306 unsigned long flags; 307 308 spin_lock_irqsave (&ohci->lock, flags); 309 310 /* handle autosuspended root: finish resuming before 311 * letting khubd or root hub timer see state changes. 312 */ 313 if (unlikely((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER 314 || !HC_IS_RUNNING(hcd->state))) { 315 can_suspend = 0; 316 goto done; 317 } 318 319 /* undocumented erratum seen on at least rev D */ 320 if ((ohci->flags & OHCI_QUIRK_AMD756) 321 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { 322 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", 323 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); 324 /* retry later; "should not happen" */ 325 goto done; 326 } 327 328 /* init status */ 329 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) 330 buf [0] = changed = 1; 331 else 332 buf [0] = 0; 333 if (ohci->num_ports > 7) { 334 buf [1] = 0; 335 length++; 336 } 337 338 /* look at each port */ 339 for (i = 0; i < ohci->num_ports; i++) { 340 u32 status = roothub_portstatus (ohci, i); 341 342 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC 343 | RH_PS_OCIC | RH_PS_PRSC)) { 344 changed = 1; 345 if (i < 7) 346 buf [0] |= 1 << (i + 1); 347 else 348 buf [1] |= 1 << (i - 7); 349 continue; 350 } 351 352 /* can suspend if no ports are enabled; or if all all 353 * enabled ports are suspended AND remote wakeup is on. 354 */ 355 if (!(status & RH_PS_CCS)) 356 continue; 357 if ((status & RH_PS_PSS) && can_suspend) 358 continue; 359 can_suspend = 0; 360 } 361 done: 362 spin_unlock_irqrestore (&ohci->lock, flags); 363 364 #ifdef CONFIG_PM 365 /* save power by suspending idle root hubs; 366 * INTR_RD wakes us when there's work 367 */ 368 if (can_suspend 369 && !changed 370 && !ohci->ed_rm_list 371 && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES) 372 & ohci->hc_control) 373 == OHCI_USB_OPER 374 && time_after (jiffies, ohci->next_statechange) 375 && usb_trylock_device (hcd->self.root_hub) == 0 376 ) { 377 ohci_vdbg (ohci, "autosuspend\n"); 378 (void) ohci_bus_suspend (hcd); 379 usb_unlock_device (hcd->self.root_hub); 380 } 381 #endif 382 383 return changed ? length : 0; 384 } 385 386 /*-------------------------------------------------------------------------*/ 387 388 static void 389 ohci_hub_descriptor ( 390 struct ohci_hcd *ohci, 391 struct usb_hub_descriptor *desc 392 ) { 393 u32 rh = roothub_a (ohci); 394 u16 temp; 395 396 desc->bDescriptorType = 0x29; 397 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; 398 desc->bHubContrCurrent = 0; 399 400 desc->bNbrPorts = ohci->num_ports; 401 temp = 1 + (ohci->num_ports / 8); 402 desc->bDescLength = 7 + 2 * temp; 403 404 temp = 0; 405 if (rh & RH_A_NPS) /* no power switching? */ 406 temp |= 0x0002; 407 if (rh & RH_A_PSM) /* per-port power switching? */ 408 temp |= 0x0001; 409 if (rh & RH_A_NOCP) /* no overcurrent reporting? */ 410 temp |= 0x0010; 411 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ 412 temp |= 0x0008; 413 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp); 414 415 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ 416 rh = roothub_b (ohci); 417 memset(desc->bitmap, 0xff, sizeof(desc->bitmap)); 418 desc->bitmap [0] = rh & RH_B_DR; 419 if (ohci->num_ports > 7) { 420 desc->bitmap [1] = (rh & RH_B_DR) >> 8; 421 desc->bitmap [2] = 0xff; 422 } else 423 desc->bitmap [1] = 0xff; 424 } 425 426 /*-------------------------------------------------------------------------*/ 427 428 #ifdef CONFIG_USB_OTG 429 430 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) 431 { 432 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 433 u32 status; 434 435 if (!port) 436 return -EINVAL; 437 port--; 438 439 /* start port reset before HNP protocol times out */ 440 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); 441 if (!(status & RH_PS_CCS)) 442 return -ENODEV; 443 444 /* khubd will finish the reset later */ 445 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); 446 return 0; 447 } 448 449 static void start_hnp(struct ohci_hcd *ohci); 450 451 #else 452 453 #define ohci_start_port_reset NULL 454 455 #endif 456 457 /*-------------------------------------------------------------------------*/ 458 459 460 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, 461 * not necessarily continuous ... to guard against resume signaling. 462 * The short timeout is safe for non-root hubs, and is backward-compatible 463 * with earlier Linux hosts. 464 */ 465 #ifdef CONFIG_USB_SUSPEND 466 #define PORT_RESET_MSEC 50 467 #else 468 #define PORT_RESET_MSEC 10 469 #endif 470 471 /* this timer value might be vendor-specific ... */ 472 #define PORT_RESET_HW_MSEC 10 473 474 /* wrap-aware logic morphed from <linux/jiffies.h> */ 475 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) 476 477 /* called from some task, normally khubd */ 478 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port) 479 { 480 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; 481 u32 temp; 482 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); 483 u16 reset_done = now + PORT_RESET_MSEC; 484 485 /* build a "continuous enough" reset signal, with up to 486 * 3msec gap between pulses. scheduler HZ==100 must work; 487 * this might need to be deadline-scheduled. 488 */ 489 do { 490 /* spin until any current reset finishes */ 491 for (;;) { 492 temp = ohci_readl (ohci, portstat); 493 if (!(temp & RH_PS_PRS)) 494 break; 495 udelay (500); 496 } 497 498 if (!(temp & RH_PS_CCS)) 499 break; 500 if (temp & RH_PS_PRSC) 501 ohci_writel (ohci, RH_PS_PRSC, portstat); 502 503 /* start the next reset, sleep till it's probably done */ 504 ohci_writel (ohci, RH_PS_PRS, portstat); 505 msleep(PORT_RESET_HW_MSEC); 506 now = ohci_readl(ohci, &ohci->regs->fmnumber); 507 } while (tick_before(now, reset_done)); 508 /* caller synchronizes using PRSC */ 509 } 510 511 static int ohci_hub_control ( 512 struct usb_hcd *hcd, 513 u16 typeReq, 514 u16 wValue, 515 u16 wIndex, 516 char *buf, 517 u16 wLength 518 ) { 519 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 520 int ports = hcd_to_bus (hcd)->root_hub->maxchild; 521 u32 temp; 522 int retval = 0; 523 524 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) 525 return -ESHUTDOWN; 526 527 switch (typeReq) { 528 case ClearHubFeature: 529 switch (wValue) { 530 case C_HUB_OVER_CURRENT: 531 ohci_writel (ohci, RH_HS_OCIC, 532 &ohci->regs->roothub.status); 533 case C_HUB_LOCAL_POWER: 534 break; 535 default: 536 goto error; 537 } 538 break; 539 case ClearPortFeature: 540 if (!wIndex || wIndex > ports) 541 goto error; 542 wIndex--; 543 544 switch (wValue) { 545 case USB_PORT_FEAT_ENABLE: 546 temp = RH_PS_CCS; 547 break; 548 case USB_PORT_FEAT_C_ENABLE: 549 temp = RH_PS_PESC; 550 break; 551 case USB_PORT_FEAT_SUSPEND: 552 temp = RH_PS_POCI; 553 if ((ohci->hc_control & OHCI_CTRL_HCFS) 554 != OHCI_USB_OPER) 555 usb_hcd_resume_root_hub(hcd); 556 break; 557 case USB_PORT_FEAT_C_SUSPEND: 558 temp = RH_PS_PSSC; 559 break; 560 case USB_PORT_FEAT_POWER: 561 temp = RH_PS_LSDA; 562 break; 563 case USB_PORT_FEAT_C_CONNECTION: 564 temp = RH_PS_CSC; 565 break; 566 case USB_PORT_FEAT_C_OVER_CURRENT: 567 temp = RH_PS_OCIC; 568 break; 569 case USB_PORT_FEAT_C_RESET: 570 temp = RH_PS_PRSC; 571 break; 572 default: 573 goto error; 574 } 575 ohci_writel (ohci, temp, 576 &ohci->regs->roothub.portstatus [wIndex]); 577 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); 578 break; 579 case GetHubDescriptor: 580 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf); 581 break; 582 case GetHubStatus: 583 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); 584 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf); 585 break; 586 case GetPortStatus: 587 if (!wIndex || wIndex > ports) 588 goto error; 589 wIndex--; 590 temp = roothub_portstatus (ohci, wIndex); 591 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf); 592 593 #ifndef OHCI_VERBOSE_DEBUG 594 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ 595 #endif 596 dbg_port (ohci, "GetStatus", wIndex, temp); 597 break; 598 case SetHubFeature: 599 switch (wValue) { 600 case C_HUB_OVER_CURRENT: 601 // FIXME: this can be cleared, yes? 602 case C_HUB_LOCAL_POWER: 603 break; 604 default: 605 goto error; 606 } 607 break; 608 case SetPortFeature: 609 if (!wIndex || wIndex > ports) 610 goto error; 611 wIndex--; 612 switch (wValue) { 613 case USB_PORT_FEAT_SUSPEND: 614 #ifdef CONFIG_USB_OTG 615 if (hcd->self.otg_port == (wIndex + 1) 616 && hcd->self.b_hnp_enable) 617 start_hnp(ohci); 618 else 619 #endif 620 ohci_writel (ohci, RH_PS_PSS, 621 &ohci->regs->roothub.portstatus [wIndex]); 622 break; 623 case USB_PORT_FEAT_POWER: 624 ohci_writel (ohci, RH_PS_PPS, 625 &ohci->regs->roothub.portstatus [wIndex]); 626 break; 627 case USB_PORT_FEAT_RESET: 628 root_port_reset (ohci, wIndex); 629 break; 630 default: 631 goto error; 632 } 633 break; 634 635 default: 636 error: 637 /* "protocol stall" on error */ 638 retval = -EPIPE; 639 } 640 return retval; 641 } 642 643