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#define OHCI_SCHED_ENABLES \ 40 (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE) 41 42static void dl_done_list (struct ohci_hcd *); 43static void finish_unlinks (struct ohci_hcd *, u16); 44 45#ifdef CONFIG_PM 46static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop) 47__releases(ohci->lock) 48__acquires(ohci->lock) 49{ 50 int status = 0; 51 52 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 53 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 54 case OHCI_USB_RESUME: 55 ohci_dbg (ohci, "resume/suspend?\n"); 56 ohci->hc_control &= ~OHCI_CTRL_HCFS; 57 ohci->hc_control |= OHCI_USB_RESET; 58 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 59 (void) ohci_readl (ohci, &ohci->regs->control); 60 /* FALL THROUGH */ 61 case OHCI_USB_RESET: 62 status = -EBUSY; 63 ohci_dbg (ohci, "needs reinit!\n"); 64 goto done; 65 case OHCI_USB_SUSPEND: 66 if (!ohci->autostop) { 67 ohci_dbg (ohci, "already suspended\n"); 68 goto done; 69 } 70 } 71 ohci_dbg (ohci, "%s root hub\n", 72 autostop ? "auto-stop" : "suspend"); 73 74 /* First stop any processing */ 75 if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) { 76 ohci->hc_control &= ~OHCI_SCHED_ENABLES; 77 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 78 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 79 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus); 80 81 /* sched disables take effect on the next frame, 82 * then the last WDH could take 6+ msec 83 */ 84 ohci_dbg (ohci, "stopping schedules ...\n"); 85 ohci->autostop = 0; 86 spin_unlock_irq (&ohci->lock); 87 msleep (8); 88 spin_lock_irq (&ohci->lock); 89 } 90 dl_done_list (ohci); 91 finish_unlinks (ohci, ohci_frame_no(ohci)); 92 93 /* maybe resume can wake root hub */ 94 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) { 95 ohci->hc_control |= OHCI_CTRL_RWE; 96 } else { 97 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD, 98 &ohci->regs->intrdisable); 99 ohci->hc_control &= ~OHCI_CTRL_RWE; 100 } 101 102 /* Suspend hub ... this is the "global (to this bus) suspend" mode, 103 * which doesn't imply ports will first be individually suspended. 104 */ 105 ohci->hc_control &= ~OHCI_CTRL_HCFS; 106 ohci->hc_control |= OHCI_USB_SUSPEND; 107 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 108 (void) ohci_readl (ohci, &ohci->regs->control); 109 110 /* no resumes until devices finish suspending */ 111 if (!autostop) { 112 ohci->next_statechange = jiffies + msecs_to_jiffies (5); 113 ohci->autostop = 0; 114 } 115 116done: 117 return status; 118} 119 120static inline struct ed *find_head (struct ed *ed) 121{ 122 /* for bulk and control lists */ 123 while (ed->ed_prev) 124 ed = ed->ed_prev; 125 return ed; 126} 127 128/* caller has locked the root hub */ 129static int ohci_rh_resume (struct ohci_hcd *ohci) 130__releases(ohci->lock) 131__acquires(ohci->lock) 132{ 133 struct usb_hcd *hcd = ohci_to_hcd (ohci); 134 u32 temp, enables; 135 int status = -EINPROGRESS; 136 int autostopped = ohci->autostop; 137 138 ohci->autostop = 0; 139 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 140 141 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { 142 /* this can happen after resuming a swsusp snapshot */ 143 if (hcd->state == HC_STATE_RESUMING) { 144 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n", 145 ohci->hc_control); 146 status = -EBUSY; 147 /* this happens when pmcore resumes HC then root */ 148 } else { 149 ohci_dbg (ohci, "duplicate resume\n"); 150 status = 0; 151 } 152 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) { 153 case OHCI_USB_SUSPEND: 154 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES); 155 ohci->hc_control |= OHCI_USB_RESUME; 156 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 157 (void) ohci_readl (ohci, &ohci->regs->control); 158 ohci_dbg (ohci, "%s root hub\n", 159 autostopped ? "auto-start" : "resume"); 160 break; 161 case OHCI_USB_RESUME: 162 /* HCFS changes sometime after INTR_RD */ 163 ohci_dbg(ohci, "%swakeup root hub\n", 164 autostopped ? "auto-" : ""); 165 break; 166 case OHCI_USB_OPER: 167 /* this can happen after resuming a swsusp snapshot */ 168 ohci_dbg (ohci, "snapshot resume? reinit\n"); 169 status = -EBUSY; 170 break; 171 default: /* RESET, we lost power */ 172 ohci_dbg (ohci, "lost power\n"); 173 status = -EBUSY; 174 } 175 if (status == -EBUSY) { 176 if (!autostopped) { 177 spin_unlock_irq (&ohci->lock); 178 (void) ohci_init (ohci); 179 status = ohci_restart (ohci); 180 181 usb_root_hub_lost_power(hcd->self.root_hub); 182 183 spin_lock_irq (&ohci->lock); 184 } 185 return status; 186 } 187 if (status != -EINPROGRESS) 188 return status; 189 if (autostopped) 190 goto skip_resume; 191 spin_unlock_irq (&ohci->lock); 192 193 /* Some controllers (lucent erratum) need extra-long delays */ 194 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1); 195 196 temp = ohci_readl (ohci, &ohci->regs->control); 197 temp &= OHCI_CTRL_HCFS; 198 if (temp != OHCI_USB_RESUME) { 199 ohci_err (ohci, "controller won't resume\n"); 200 spin_lock_irq(&ohci->lock); 201 return -EBUSY; 202 } 203 204 /* disable old schedule state, reinit from scratch */ 205 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead); 206 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent); 207 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead); 208 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent); 209 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent); 210 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca); 211 212 /* Sometimes PCI D3 suspend trashes frame timings ... */ 213 periodic_reinit (ohci); 214 215 /* the following code is executed with ohci->lock held and 216 * irqs disabled if and only if autostopped is true 217 */ 218 219skip_resume: 220 /* interrupts might have been disabled */ 221 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable); 222 if (ohci->ed_rm_list) 223 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable); 224 225 /* Then re-enable operations */ 226 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control); 227 (void) ohci_readl (ohci, &ohci->regs->control); 228 if (!autostopped) 229 msleep (3); 230 231 temp = ohci->hc_control; 232 temp &= OHCI_CTRL_RWC; 233 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER; 234 ohci->hc_control = temp; 235 ohci_writel (ohci, temp, &ohci->regs->control); 236 (void) ohci_readl (ohci, &ohci->regs->control); 237 238 /* TRSMRCY */ 239 if (!autostopped) { 240 msleep (10); 241 spin_lock_irq (&ohci->lock); 242 } 243 /* now ohci->lock is always held and irqs are always disabled */ 244 245 /* keep it alive for more than ~5x suspend + resume costs */ 246 ohci->next_statechange = jiffies + STATECHANGE_DELAY; 247 248 /* maybe turn schedules back on */ 249 enables = 0; 250 temp = 0; 251 if (!ohci->ed_rm_list) { 252 if (ohci->ed_controltail) { 253 ohci_writel (ohci, 254 find_head (ohci->ed_controltail)->dma, 255 &ohci->regs->ed_controlhead); 256 enables |= OHCI_CTRL_CLE; 257 temp |= OHCI_CLF; 258 } 259 if (ohci->ed_bulktail) { 260 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma, 261 &ohci->regs->ed_bulkhead); 262 enables |= OHCI_CTRL_BLE; 263 temp |= OHCI_BLF; 264 } 265 } 266 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs) 267 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE; 268 if (enables) { 269 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables); 270 ohci->hc_control |= enables; 271 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 272 if (temp) 273 ohci_writel (ohci, temp, &ohci->regs->cmdstatus); 274 (void) ohci_readl (ohci, &ohci->regs->control); 275 } 276 277 return 0; 278} 279 280static int ohci_bus_suspend (struct usb_hcd *hcd) 281{ 282 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 283 int rc; 284 285 spin_lock_irq (&ohci->lock); 286 287 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 288 rc = -ESHUTDOWN; 289 else 290 rc = ohci_rh_suspend (ohci, 0); 291 spin_unlock_irq (&ohci->lock); 292 return rc; 293} 294 295static int ohci_bus_resume (struct usb_hcd *hcd) 296{ 297 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 298 int rc; 299 300 if (time_before (jiffies, ohci->next_statechange)) 301 msleep(5); 302 303 spin_lock_irq (&ohci->lock); 304 305 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 306 rc = -ESHUTDOWN; 307 else 308 rc = ohci_rh_resume (ohci); 309 spin_unlock_irq (&ohci->lock); 310 311 /* poll until we know a device is connected or we autostop */ 312 if (rc == 0) 313 usb_hcd_poll_rh_status(hcd); 314 return rc; 315} 316 317/* Carry out the final steps of resuming the controller device */ 318static void ohci_finish_controller_resume(struct usb_hcd *hcd) 319{ 320 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 321 int port; 322 bool need_reinit = false; 323 324 /* See if the controller is already running or has been reset */ 325 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control); 326 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { 327 need_reinit = true; 328 } else { 329 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 330 case OHCI_USB_OPER: 331 case OHCI_USB_RESET: 332 need_reinit = true; 333 } 334 } 335 336 /* If needed, reinitialize and suspend the root hub */ 337 if (need_reinit) { 338 spin_lock_irq(&ohci->lock); 339 hcd->state = HC_STATE_RESUMING; 340 ohci_rh_resume(ohci); 341 hcd->state = HC_STATE_QUIESCING; 342 ohci_rh_suspend(ohci, 0); 343 hcd->state = HC_STATE_SUSPENDED; 344 spin_unlock_irq(&ohci->lock); 345 } 346 347 /* Normally just turn on port power and enable interrupts */ 348 else { 349 ohci_dbg(ohci, "powerup ports\n"); 350 for (port = 0; port < ohci->num_ports; port++) 351 ohci_writel(ohci, RH_PS_PPS, 352 &ohci->regs->roothub.portstatus[port]); 353 354 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable); 355 ohci_readl(ohci, &ohci->regs->intrenable); 356 msleep(20); 357 } 358 359 /* Does the root hub have a port wakeup pending? */ 360 if (ohci_readl(ohci, &ohci->regs->intrstatus) & 361 (OHCI_INTR_RD | OHCI_INTR_RHSC)) 362 usb_hcd_resume_root_hub(hcd); 363} 364 365/* Carry out polling-, autostop-, and autoresume-related state changes */ 366static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 367 int any_connected, int rhsc_status) 368{ 369 int poll_rh = 1; 370 int rhsc_enable; 371 372 /* Some broken controllers never turn off RHSC in the interrupt 373 * status register. For their sake we won't re-enable RHSC 374 * interrupts if the interrupt bit is already active. 375 */ 376 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & 377 OHCI_INTR_RHSC; 378 379 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 380 case OHCI_USB_OPER: 381 /* If no status changes are pending, enable RHSC interrupts. */ 382 if (!rhsc_enable && !rhsc_status && !changed) { 383 rhsc_enable = OHCI_INTR_RHSC; 384 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); 385 } 386 387 /* Keep on polling until we know a device is connected 388 * and RHSC is enabled, or until we autostop. 389 */ 390 if (!ohci->autostop) { 391 if (any_connected || 392 !device_may_wakeup(&ohci_to_hcd(ohci) 393 ->self.root_hub->dev)) { 394 if (rhsc_enable) 395 poll_rh = 0; 396 } else { 397 ohci->autostop = 1; 398 ohci->next_statechange = jiffies + HZ; 399 } 400 401 /* if no devices have been attached for one second, autostop */ 402 } else { 403 if (changed || any_connected) { 404 ohci->autostop = 0; 405 ohci->next_statechange = jiffies + 406 STATECHANGE_DELAY; 407 } else if (time_after_eq(jiffies, 408 ohci->next_statechange) 409 && !ohci->ed_rm_list 410 && !(ohci->hc_control & 411 OHCI_SCHED_ENABLES)) { 412 ohci_rh_suspend(ohci, 1); 413 if (rhsc_enable) 414 poll_rh = 0; 415 } 416 } 417 break; 418 419 case OHCI_USB_SUSPEND: 420 case OHCI_USB_RESUME: 421 /* if there is a port change, autostart or ask to be resumed */ 422 if (changed) { 423 if (ohci->autostop) 424 ohci_rh_resume(ohci); 425 else 426 usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); 427 428 /* If remote wakeup is disabled, stop polling */ 429 } else if (!ohci->autostop && 430 !ohci_to_hcd(ohci)->self.root_hub-> 431 do_remote_wakeup) { 432 poll_rh = 0; 433 434 } else { 435 /* If no status changes are pending, 436 * enable RHSC interrupts 437 */ 438 if (!rhsc_enable && !rhsc_status) { 439 rhsc_enable = OHCI_INTR_RHSC; 440 ohci_writel(ohci, rhsc_enable, 441 &ohci->regs->intrenable); 442 } 443 /* Keep polling until RHSC is enabled */ 444 if (rhsc_enable) 445 poll_rh = 0; 446 } 447 break; 448 } 449 return poll_rh; 450} 451 452#else /* CONFIG_PM */ 453 454static inline int ohci_rh_resume(struct ohci_hcd *ohci) 455{ 456 return 0; 457} 458 459/* Carry out polling-related state changes. 460 * autostop isn't used when CONFIG_PM is turned off. 461 */ 462static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 463 int any_connected, int rhsc_status) 464{ 465 /* If RHSC is enabled, don't poll */ 466 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) 467 return 0; 468 469 /* If status changes are pending, continue polling. 470 * Conversely, if no status changes are pending but the RHSC 471 * status bit was set, then RHSC may be broken so continue polling. 472 */ 473 if (changed || rhsc_status) 474 return 1; 475 476 /* It's safe to re-enable RHSC interrupts */ 477 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); 478 return 0; 479} 480 481#endif /* CONFIG_PM */ 482 483/*-------------------------------------------------------------------------*/ 484 485/* build "status change" packet (one or two bytes) from HC registers */ 486 487static int 488ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 489{ 490 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 491 int i, changed = 0, length = 1; 492 int any_connected = 0; 493 int rhsc_status; 494 unsigned long flags; 495 496 spin_lock_irqsave (&ohci->lock, flags); 497 if (!HCD_HW_ACCESSIBLE(hcd)) 498 goto done; 499 500 /* undocumented erratum seen on at least rev D */ 501 if ((ohci->flags & OHCI_QUIRK_AMD756) 502 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { 503 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", 504 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); 505 /* retry later; "should not happen" */ 506 goto done; 507 } 508 509 /* init status */ 510 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) 511 buf [0] = changed = 1; 512 else 513 buf [0] = 0; 514 if (ohci->num_ports > 7) { 515 buf [1] = 0; 516 length++; 517 } 518 519 /* Clear the RHSC status flag before reading the port statuses */ 520 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus); 521 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & 522 OHCI_INTR_RHSC; 523 524 /* look at each port */ 525 for (i = 0; i < ohci->num_ports; i++) { 526 u32 status = roothub_portstatus (ohci, i); 527 528 /* can't autostop if ports are connected */ 529 any_connected |= (status & RH_PS_CCS); 530 531 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC 532 | RH_PS_OCIC | RH_PS_PRSC)) { 533 changed = 1; 534 if (i < 7) 535 buf [0] |= 1 << (i + 1); 536 else 537 buf [1] |= 1 << (i - 7); 538 } 539 } 540 541 if (ohci_root_hub_state_changes(ohci, changed, 542 any_connected, rhsc_status)) 543 set_bit(HCD_FLAG_POLL_RH, &hcd->flags); 544 else 545 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); 546 547 548done: 549 spin_unlock_irqrestore (&ohci->lock, flags); 550 551 return changed ? length : 0; 552} 553 554/*-------------------------------------------------------------------------*/ 555 556static void 557ohci_hub_descriptor ( 558 struct ohci_hcd *ohci, 559 struct usb_hub_descriptor *desc 560) { 561 u32 rh = roothub_a (ohci); 562 u16 temp; 563 564 desc->bDescriptorType = 0x29; 565 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; 566 desc->bHubContrCurrent = 0; 567 568 desc->bNbrPorts = ohci->num_ports; 569 temp = 1 + (ohci->num_ports / 8); 570 desc->bDescLength = 7 + 2 * temp; 571 572 temp = 0; 573 if (rh & RH_A_NPS) /* no power switching? */ 574 temp |= 0x0002; 575 if (rh & RH_A_PSM) /* per-port power switching? */ 576 temp |= 0x0001; 577 if (rh & RH_A_NOCP) /* no overcurrent reporting? */ 578 temp |= 0x0010; 579 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ 580 temp |= 0x0008; 581 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp); 582 583 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ 584 rh = roothub_b (ohci); 585 memset(desc->bitmap, 0xff, sizeof(desc->bitmap)); 586 desc->bitmap [0] = rh & RH_B_DR; 587 if (ohci->num_ports > 7) { 588 desc->bitmap [1] = (rh & RH_B_DR) >> 8; 589 desc->bitmap [2] = 0xff; 590 } else 591 desc->bitmap [1] = 0xff; 592} 593 594/*-------------------------------------------------------------------------*/ 595 596#ifdef CONFIG_USB_OTG 597 598static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) 599{ 600 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 601 u32 status; 602 603 if (!port) 604 return -EINVAL; 605 port--; 606 607 /* start port reset before HNP protocol times out */ 608 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); 609 if (!(status & RH_PS_CCS)) 610 return -ENODEV; 611 612 /* khubd will finish the reset later */ 613 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); 614 return 0; 615} 616 617#else 618 619#define ohci_start_port_reset NULL 620 621#endif 622 623/*-------------------------------------------------------------------------*/ 624 625 626/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, 627 * not necessarily continuous ... to guard against resume signaling. 628 * The short timeout is safe for non-root hubs, and is backward-compatible 629 * with earlier Linux hosts. 630 */ 631#ifdef CONFIG_USB_SUSPEND 632#define PORT_RESET_MSEC 50 633#else 634#define PORT_RESET_MSEC 10 635#endif 636 637/* this timer value might be vendor-specific ... */ 638#define PORT_RESET_HW_MSEC 10 639 640/* wrap-aware logic morphed from <linux/jiffies.h> */ 641#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) 642 643/* called from some task, normally khubd */ 644static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port) 645{ 646 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; 647 u32 temp = 0; 648 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); 649 u16 reset_done = now + PORT_RESET_MSEC; 650 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC); 651 652 /* build a "continuous enough" reset signal, with up to 653 * 3msec gap between pulses. scheduler HZ==100 must work; 654 * this might need to be deadline-scheduled. 655 */ 656 do { 657 int limit_2; 658 659 /* spin until any current reset finishes */ 660 limit_2 = PORT_RESET_HW_MSEC * 2; 661 while (--limit_2 >= 0) { 662 temp = ohci_readl (ohci, portstat); 663 /* handle e.g. CardBus eject */ 664 if (temp == ~(u32)0) 665 return -ESHUTDOWN; 666 if (!(temp & RH_PS_PRS)) 667 break; 668 udelay (500); 669 } 670 671 /* timeout (a hardware error) has been observed when 672 * EHCI sets CF while this driver is resetting a port; 673 * presumably other disconnect paths might do it too. 674 */ 675 if (limit_2 < 0) { 676 ohci_dbg(ohci, 677 "port[%d] reset timeout, stat %08x\n", 678 port, temp); 679 break; 680 } 681 682 if (!(temp & RH_PS_CCS)) 683 break; 684 if (temp & RH_PS_PRSC) 685 ohci_writel (ohci, RH_PS_PRSC, portstat); 686 687 /* start the next reset, sleep till it's probably done */ 688 ohci_writel (ohci, RH_PS_PRS, portstat); 689 msleep(PORT_RESET_HW_MSEC); 690 now = ohci_readl(ohci, &ohci->regs->fmnumber); 691 } while (tick_before(now, reset_done) && --limit_1 >= 0); 692 693 /* caller synchronizes using PRSC ... and handles PRS 694 * still being set when this returns. 695 */ 696 697 return 0; 698} 699 700static int ohci_hub_control ( 701 struct usb_hcd *hcd, 702 u16 typeReq, 703 u16 wValue, 704 u16 wIndex, 705 char *buf, 706 u16 wLength 707) { 708 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 709 int ports = ohci->num_ports; 710 u32 temp; 711 int retval = 0; 712 713 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 714 return -ESHUTDOWN; 715 716 switch (typeReq) { 717 case ClearHubFeature: 718 switch (wValue) { 719 case C_HUB_OVER_CURRENT: 720 ohci_writel (ohci, RH_HS_OCIC, 721 &ohci->regs->roothub.status); 722 case C_HUB_LOCAL_POWER: 723 break; 724 default: 725 goto error; 726 } 727 break; 728 case ClearPortFeature: 729 if (!wIndex || wIndex > ports) 730 goto error; 731 wIndex--; 732 733 switch (wValue) { 734 case USB_PORT_FEAT_ENABLE: 735 temp = RH_PS_CCS; 736 break; 737 case USB_PORT_FEAT_C_ENABLE: 738 temp = RH_PS_PESC; 739 break; 740 case USB_PORT_FEAT_SUSPEND: 741 temp = RH_PS_POCI; 742 break; 743 case USB_PORT_FEAT_C_SUSPEND: 744 temp = RH_PS_PSSC; 745 break; 746 case USB_PORT_FEAT_POWER: 747 temp = RH_PS_LSDA; 748 break; 749 case USB_PORT_FEAT_C_CONNECTION: 750 temp = RH_PS_CSC; 751 break; 752 case USB_PORT_FEAT_C_OVER_CURRENT: 753 temp = RH_PS_OCIC; 754 break; 755 case USB_PORT_FEAT_C_RESET: 756 temp = RH_PS_PRSC; 757 break; 758 default: 759 goto error; 760 } 761 ohci_writel (ohci, temp, 762 &ohci->regs->roothub.portstatus [wIndex]); 763 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); 764 break; 765 case GetHubDescriptor: 766 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf); 767 break; 768 case GetHubStatus: 769 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); 770 put_unaligned_le32(temp, buf); 771 break; 772 case GetPortStatus: 773 if (!wIndex || wIndex > ports) 774 goto error; 775 wIndex--; 776 temp = roothub_portstatus (ohci, wIndex); 777 put_unaligned_le32(temp, buf); 778 779#ifndef OHCI_VERBOSE_DEBUG 780 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ 781#endif 782 dbg_port (ohci, "GetStatus", wIndex, temp); 783 break; 784 case SetHubFeature: 785 switch (wValue) { 786 case C_HUB_OVER_CURRENT: 787 case C_HUB_LOCAL_POWER: 788 break; 789 default: 790 goto error; 791 } 792 break; 793 case SetPortFeature: 794 if (!wIndex || wIndex > ports) 795 goto error; 796 wIndex--; 797 switch (wValue) { 798 case USB_PORT_FEAT_SUSPEND: 799#ifdef CONFIG_USB_OTG 800 if (hcd->self.otg_port == (wIndex + 1) 801 && hcd->self.b_hnp_enable) 802 ohci->start_hnp(ohci); 803 else 804#endif 805 ohci_writel (ohci, RH_PS_PSS, 806 &ohci->regs->roothub.portstatus [wIndex]); 807 break; 808 case USB_PORT_FEAT_POWER: 809 ohci_writel (ohci, RH_PS_PPS, 810 &ohci->regs->roothub.portstatus [wIndex]); 811 break; 812 case USB_PORT_FEAT_RESET: 813 retval = root_port_reset (ohci, wIndex); 814 break; 815 default: 816 goto error; 817 } 818 break; 819 820 default: 821error: 822 /* "protocol stall" on error */ 823 retval = -EPIPE; 824 } 825 return retval; 826} 827