1 // SPDX-License-Identifier: GPL-1.0+ 2 /* 3 * OHCI HCD (Host Controller Driver) for USB. 4 * 5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 6 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net> 7 * 8 * This file is licenced under GPL 9 */ 10 11 /*-------------------------------------------------------------------------*/ 12 13 /* 14 * OHCI Root Hub ... the nonsharable stuff 15 */ 16 17 #define dbg_port(hc,label,num,value) \ 18 ohci_dbg (hc, \ 19 "%s roothub.portstatus [%d] " \ 20 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \ 21 label, num, value, \ 22 (value & RH_PS_PRSC) ? " PRSC" : "", \ 23 (value & RH_PS_OCIC) ? " OCIC" : "", \ 24 (value & RH_PS_PSSC) ? " PSSC" : "", \ 25 (value & RH_PS_PESC) ? " PESC" : "", \ 26 (value & RH_PS_CSC) ? " CSC" : "", \ 27 \ 28 (value & RH_PS_LSDA) ? " LSDA" : "", \ 29 (value & RH_PS_PPS) ? " PPS" : "", \ 30 (value & RH_PS_PRS) ? " PRS" : "", \ 31 (value & RH_PS_POCI) ? " POCI" : "", \ 32 (value & RH_PS_PSS) ? " PSS" : "", \ 33 \ 34 (value & RH_PS_PES) ? " PES" : "", \ 35 (value & RH_PS_CCS) ? " CCS" : "" \ 36 ); 37 38 /*-------------------------------------------------------------------------*/ 39 40 #define OHCI_SCHED_ENABLES \ 41 (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE) 42 43 static void update_done_list(struct ohci_hcd *); 44 static void ohci_work(struct ohci_hcd *); 45 46 #ifdef CONFIG_PM 47 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop) 48 __releases(ohci->lock) 49 __acquires(ohci->lock) 50 { 51 int status = 0; 52 53 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 54 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 55 case OHCI_USB_RESUME: 56 ohci_dbg (ohci, "resume/suspend?\n"); 57 ohci->hc_control &= ~OHCI_CTRL_HCFS; 58 ohci->hc_control |= OHCI_USB_RESET; 59 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 60 (void) ohci_readl (ohci, &ohci->regs->control); 61 fallthrough; 62 case OHCI_USB_RESET: 63 status = -EBUSY; 64 ohci_dbg (ohci, "needs reinit!\n"); 65 goto done; 66 case OHCI_USB_SUSPEND: 67 if (!ohci->autostop) { 68 ohci_dbg (ohci, "already suspended\n"); 69 goto done; 70 } 71 } 72 ohci_dbg (ohci, "%s root hub\n", 73 autostop ? "auto-stop" : "suspend"); 74 75 /* First stop any processing */ 76 if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) { 77 ohci->hc_control &= ~OHCI_SCHED_ENABLES; 78 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 79 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 80 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus); 81 82 /* sched disables take effect on the next frame, 83 * then the last WDH could take 6+ msec 84 */ 85 ohci_dbg (ohci, "stopping schedules ...\n"); 86 ohci->autostop = 0; 87 spin_unlock_irq (&ohci->lock); 88 msleep (8); 89 spin_lock_irq (&ohci->lock); 90 } 91 update_done_list(ohci); 92 ohci_work(ohci); 93 94 /* 95 * Some controllers don't handle "global" suspend properly if 96 * there are unsuspended ports. For these controllers, put all 97 * the enabled ports into suspend before suspending the root hub. 98 */ 99 if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) { 100 __hc32 __iomem *portstat = ohci->regs->roothub.portstatus; 101 int i; 102 unsigned temp; 103 104 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) { 105 temp = ohci_readl(ohci, portstat); 106 if ((temp & (RH_PS_PES | RH_PS_PSS)) == 107 RH_PS_PES) 108 ohci_writel(ohci, RH_PS_PSS, portstat); 109 } 110 } 111 112 /* maybe resume can wake root hub */ 113 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) { 114 ohci->hc_control |= OHCI_CTRL_RWE; 115 } else { 116 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD, 117 &ohci->regs->intrdisable); 118 ohci->hc_control &= ~OHCI_CTRL_RWE; 119 } 120 121 /* Suspend hub ... this is the "global (to this bus) suspend" mode, 122 * which doesn't imply ports will first be individually suspended. 123 */ 124 ohci->hc_control &= ~OHCI_CTRL_HCFS; 125 ohci->hc_control |= OHCI_USB_SUSPEND; 126 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 127 (void) ohci_readl (ohci, &ohci->regs->control); 128 129 /* no resumes until devices finish suspending */ 130 if (!autostop) { 131 ohci->next_statechange = jiffies + msecs_to_jiffies (5); 132 ohci->autostop = 0; 133 ohci->rh_state = OHCI_RH_SUSPENDED; 134 } 135 136 done: 137 return status; 138 } 139 140 static inline struct ed *find_head (struct ed *ed) 141 { 142 /* for bulk and control lists */ 143 while (ed->ed_prev) 144 ed = ed->ed_prev; 145 return ed; 146 } 147 148 /* caller has locked the root hub */ 149 static int ohci_rh_resume (struct ohci_hcd *ohci) 150 __releases(ohci->lock) 151 __acquires(ohci->lock) 152 { 153 struct usb_hcd *hcd = ohci_to_hcd (ohci); 154 u32 temp, enables; 155 int status = -EINPROGRESS; 156 int autostopped = ohci->autostop; 157 158 ohci->autostop = 0; 159 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); 160 161 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { 162 /* this can happen after resuming a swsusp snapshot */ 163 if (ohci->rh_state != OHCI_RH_RUNNING) { 164 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n", 165 ohci->hc_control); 166 status = -EBUSY; 167 /* this happens when pmcore resumes HC then root */ 168 } else { 169 ohci_dbg (ohci, "duplicate resume\n"); 170 status = 0; 171 } 172 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) { 173 case OHCI_USB_SUSPEND: 174 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES); 175 ohci->hc_control |= OHCI_USB_RESUME; 176 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 177 (void) ohci_readl (ohci, &ohci->regs->control); 178 ohci_dbg (ohci, "%s root hub\n", 179 autostopped ? "auto-start" : "resume"); 180 break; 181 case OHCI_USB_RESUME: 182 /* HCFS changes sometime after INTR_RD */ 183 ohci_dbg(ohci, "%swakeup root hub\n", 184 autostopped ? "auto-" : ""); 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 if (status == -EBUSY) { 196 if (!autostopped) { 197 spin_unlock_irq (&ohci->lock); 198 status = ohci_restart (ohci); 199 200 usb_root_hub_lost_power(hcd->self.root_hub); 201 202 spin_lock_irq (&ohci->lock); 203 } 204 return status; 205 } 206 if (status != -EINPROGRESS) 207 return status; 208 if (autostopped) 209 goto skip_resume; 210 spin_unlock_irq (&ohci->lock); 211 212 /* Some controllers (lucent erratum) need extra-long delays */ 213 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1); 214 215 temp = ohci_readl (ohci, &ohci->regs->control); 216 temp &= OHCI_CTRL_HCFS; 217 if (temp != OHCI_USB_RESUME) { 218 ohci_err (ohci, "controller won't resume\n"); 219 spin_lock_irq(&ohci->lock); 220 return -EBUSY; 221 } 222 223 /* disable old schedule state, reinit from scratch */ 224 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead); 225 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent); 226 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead); 227 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent); 228 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent); 229 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca); 230 231 /* Sometimes PCI D3 suspend trashes frame timings ... */ 232 periodic_reinit (ohci); 233 234 /* 235 * The following code is executed with ohci->lock held and 236 * irqs disabled if and only if autostopped is true. This 237 * will cause sparse to warn about a "context imbalance". 238 */ 239 skip_resume: 240 /* interrupts might have been disabled */ 241 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable); 242 if (ohci->ed_rm_list) 243 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable); 244 245 /* Then re-enable operations */ 246 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control); 247 (void) ohci_readl (ohci, &ohci->regs->control); 248 if (!autostopped) 249 msleep (3); 250 251 temp = ohci->hc_control; 252 temp &= OHCI_CTRL_RWC; 253 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER; 254 ohci->hc_control = temp; 255 ohci_writel (ohci, temp, &ohci->regs->control); 256 (void) ohci_readl (ohci, &ohci->regs->control); 257 258 /* TRSMRCY */ 259 if (!autostopped) { 260 msleep (10); 261 spin_lock_irq (&ohci->lock); 262 } 263 /* now ohci->lock is always held and irqs are always disabled */ 264 265 /* keep it alive for more than ~5x suspend + resume costs */ 266 ohci->next_statechange = jiffies + STATECHANGE_DELAY; 267 268 /* maybe turn schedules back on */ 269 enables = 0; 270 temp = 0; 271 if (!ohci->ed_rm_list) { 272 if (ohci->ed_controltail) { 273 ohci_writel (ohci, 274 find_head (ohci->ed_controltail)->dma, 275 &ohci->regs->ed_controlhead); 276 enables |= OHCI_CTRL_CLE; 277 temp |= OHCI_CLF; 278 } 279 if (ohci->ed_bulktail) { 280 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma, 281 &ohci->regs->ed_bulkhead); 282 enables |= OHCI_CTRL_BLE; 283 temp |= OHCI_BLF; 284 } 285 } 286 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs) 287 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE; 288 if (enables) { 289 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables); 290 ohci->hc_control |= enables; 291 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); 292 if (temp) 293 ohci_writel (ohci, temp, &ohci->regs->cmdstatus); 294 (void) ohci_readl (ohci, &ohci->regs->control); 295 } 296 297 ohci->rh_state = OHCI_RH_RUNNING; 298 return 0; 299 } 300 301 static int ohci_bus_suspend (struct usb_hcd *hcd) 302 { 303 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 304 int rc; 305 306 spin_lock_irq (&ohci->lock); 307 308 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 309 rc = -ESHUTDOWN; 310 else 311 rc = ohci_rh_suspend (ohci, 0); 312 spin_unlock_irq (&ohci->lock); 313 314 if (rc == 0) { 315 del_timer_sync(&ohci->io_watchdog); 316 ohci->prev_frame_no = IO_WATCHDOG_OFF; 317 } 318 return rc; 319 } 320 321 static int ohci_bus_resume (struct usb_hcd *hcd) 322 { 323 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 324 int rc; 325 326 if (time_before (jiffies, ohci->next_statechange)) 327 msleep(5); 328 329 spin_lock_irq (&ohci->lock); 330 331 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 332 rc = -ESHUTDOWN; 333 else 334 rc = ohci_rh_resume (ohci); 335 spin_unlock_irq (&ohci->lock); 336 337 /* poll until we know a device is connected or we autostop */ 338 if (rc == 0) 339 usb_hcd_poll_rh_status(hcd); 340 return rc; 341 } 342 343 /* Carry out polling-, autostop-, and autoresume-related state changes */ 344 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 345 int any_connected, int rhsc_status) 346 { 347 int poll_rh = 1; 348 int rhsc_enable; 349 350 /* Some broken controllers never turn off RHSC in the interrupt 351 * status register. For their sake we won't re-enable RHSC 352 * interrupts if the interrupt bit is already active. 353 */ 354 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & 355 OHCI_INTR_RHSC; 356 357 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 358 case OHCI_USB_OPER: 359 /* If no status changes are pending, enable RHSC interrupts. */ 360 if (!rhsc_enable && !rhsc_status && !changed) { 361 rhsc_enable = OHCI_INTR_RHSC; 362 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); 363 } 364 365 /* Keep on polling until we know a device is connected 366 * and RHSC is enabled, or until we autostop. 367 */ 368 if (!ohci->autostop) { 369 if (any_connected || 370 !device_may_wakeup(&ohci_to_hcd(ohci) 371 ->self.root_hub->dev)) { 372 if (rhsc_enable) 373 poll_rh = 0; 374 } else { 375 ohci->autostop = 1; 376 ohci->next_statechange = jiffies + HZ; 377 } 378 379 /* if no devices have been attached for one second, autostop */ 380 } else { 381 if (changed || any_connected) { 382 ohci->autostop = 0; 383 ohci->next_statechange = jiffies + 384 STATECHANGE_DELAY; 385 } else if (time_after_eq(jiffies, 386 ohci->next_statechange) 387 && !ohci->ed_rm_list 388 && !(ohci->hc_control & 389 OHCI_SCHED_ENABLES)) { 390 ohci_rh_suspend(ohci, 1); 391 if (rhsc_enable) 392 poll_rh = 0; 393 } 394 } 395 break; 396 397 case OHCI_USB_SUSPEND: 398 case OHCI_USB_RESUME: 399 /* if there is a port change, autostart or ask to be resumed */ 400 if (changed) { 401 if (ohci->autostop) 402 ohci_rh_resume(ohci); 403 else 404 usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); 405 406 /* If remote wakeup is disabled, stop polling */ 407 } else if (!ohci->autostop && 408 !ohci_to_hcd(ohci)->self.root_hub-> 409 do_remote_wakeup) { 410 poll_rh = 0; 411 412 } else { 413 /* If no status changes are pending, 414 * enable RHSC interrupts 415 */ 416 if (!rhsc_enable && !rhsc_status) { 417 rhsc_enable = OHCI_INTR_RHSC; 418 ohci_writel(ohci, rhsc_enable, 419 &ohci->regs->intrenable); 420 } 421 /* Keep polling until RHSC is enabled */ 422 if (rhsc_enable) 423 poll_rh = 0; 424 } 425 break; 426 } 427 return poll_rh; 428 } 429 430 #else /* CONFIG_PM */ 431 432 static inline int ohci_rh_resume(struct ohci_hcd *ohci) 433 { 434 return 0; 435 } 436 437 /* Carry out polling-related state changes. 438 * autostop isn't used when CONFIG_PM is turned off. 439 */ 440 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 441 int any_connected, int rhsc_status) 442 { 443 /* If RHSC is enabled, don't poll */ 444 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) 445 return 0; 446 447 /* If status changes are pending, continue polling. 448 * Conversely, if no status changes are pending but the RHSC 449 * status bit was set, then RHSC may be broken so continue polling. 450 */ 451 if (changed || rhsc_status) 452 return 1; 453 454 /* It's safe to re-enable RHSC interrupts */ 455 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); 456 return 0; 457 } 458 459 #endif /* CONFIG_PM */ 460 461 /*-------------------------------------------------------------------------*/ 462 463 /* build "status change" packet (one or two bytes) from HC registers */ 464 465 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf) 466 { 467 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 468 int i, changed = 0, length = 1; 469 int any_connected = 0; 470 int rhsc_status; 471 unsigned long flags; 472 473 spin_lock_irqsave (&ohci->lock, flags); 474 if (!HCD_HW_ACCESSIBLE(hcd)) 475 goto done; 476 477 /* undocumented erratum seen on at least rev D */ 478 if ((ohci->flags & OHCI_QUIRK_AMD756) 479 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { 480 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", 481 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); 482 /* retry later; "should not happen" */ 483 goto done; 484 } 485 486 /* init status */ 487 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) 488 buf [0] = changed = 1; 489 else 490 buf [0] = 0; 491 if (ohci->num_ports > 7) { 492 buf [1] = 0; 493 length++; 494 } 495 496 /* Clear the RHSC status flag before reading the port statuses */ 497 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus); 498 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & 499 OHCI_INTR_RHSC; 500 501 /* look at each port */ 502 for (i = 0; i < ohci->num_ports; i++) { 503 u32 status = roothub_portstatus (ohci, i); 504 505 /* can't autostop if ports are connected */ 506 any_connected |= (status & RH_PS_CCS); 507 508 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC 509 | RH_PS_OCIC | RH_PS_PRSC)) { 510 changed = 1; 511 if (i < 7) 512 buf [0] |= 1 << (i + 1); 513 else 514 buf [1] |= 1 << (i - 7); 515 } 516 } 517 518 if (ohci_root_hub_state_changes(ohci, changed, 519 any_connected, rhsc_status)) 520 set_bit(HCD_FLAG_POLL_RH, &hcd->flags); 521 else 522 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); 523 524 525 done: 526 spin_unlock_irqrestore (&ohci->lock, flags); 527 528 return changed ? length : 0; 529 } 530 EXPORT_SYMBOL_GPL(ohci_hub_status_data); 531 532 /*-------------------------------------------------------------------------*/ 533 534 static void 535 ohci_hub_descriptor ( 536 struct ohci_hcd *ohci, 537 struct usb_hub_descriptor *desc 538 ) { 539 u32 rh = roothub_a (ohci); 540 u16 temp; 541 542 desc->bDescriptorType = USB_DT_HUB; 543 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; 544 desc->bHubContrCurrent = 0; 545 546 desc->bNbrPorts = ohci->num_ports; 547 temp = 1 + (ohci->num_ports / 8); 548 desc->bDescLength = 7 + 2 * temp; 549 550 temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM; 551 if (rh & RH_A_NPS) /* no power switching? */ 552 temp |= HUB_CHAR_NO_LPSM; 553 if (rh & RH_A_PSM) /* per-port power switching? */ 554 temp |= HUB_CHAR_INDV_PORT_LPSM; 555 if (rh & RH_A_NOCP) /* no overcurrent reporting? */ 556 temp |= HUB_CHAR_NO_OCPM; 557 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ 558 temp |= HUB_CHAR_INDV_PORT_OCPM; 559 desc->wHubCharacteristics = cpu_to_le16(temp); 560 561 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */ 562 rh = roothub_b (ohci); 563 memset(desc->u.hs.DeviceRemovable, 0xff, 564 sizeof(desc->u.hs.DeviceRemovable)); 565 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR; 566 if (ohci->num_ports > 7) { 567 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8; 568 desc->u.hs.DeviceRemovable[2] = 0xff; 569 } else 570 desc->u.hs.DeviceRemovable[1] = 0xff; 571 } 572 573 /*-------------------------------------------------------------------------*/ 574 575 #ifdef CONFIG_USB_OTG 576 577 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) 578 { 579 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 580 u32 status; 581 582 if (!port) 583 return -EINVAL; 584 port--; 585 586 /* start port reset before HNP protocol times out */ 587 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); 588 if (!(status & RH_PS_CCS)) 589 return -ENODEV; 590 591 /* hub_wq will finish the reset later */ 592 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); 593 return 0; 594 } 595 596 #else 597 598 #define ohci_start_port_reset NULL 599 600 #endif 601 602 /*-------------------------------------------------------------------------*/ 603 604 605 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, 606 * not necessarily continuous ... to guard against resume signaling. 607 */ 608 #define PORT_RESET_MSEC 50 609 610 /* this timer value might be vendor-specific ... */ 611 #define PORT_RESET_HW_MSEC 10 612 613 /* wrap-aware logic morphed from <linux/jiffies.h> */ 614 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) 615 616 /* called from some task, normally hub_wq */ 617 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port) 618 { 619 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; 620 u32 temp = 0; 621 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); 622 u16 reset_done = now + PORT_RESET_MSEC; 623 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC); 624 625 /* build a "continuous enough" reset signal, with up to 626 * 3msec gap between pulses. scheduler HZ==100 must work; 627 * this might need to be deadline-scheduled. 628 */ 629 do { 630 int limit_2; 631 632 /* spin until any current reset finishes */ 633 limit_2 = PORT_RESET_HW_MSEC * 2; 634 while (--limit_2 >= 0) { 635 temp = ohci_readl (ohci, portstat); 636 /* handle e.g. CardBus eject */ 637 if (temp == ~(u32)0) 638 return -ESHUTDOWN; 639 if (!(temp & RH_PS_PRS)) 640 break; 641 udelay (500); 642 } 643 644 /* timeout (a hardware error) has been observed when 645 * EHCI sets CF while this driver is resetting a port; 646 * presumably other disconnect paths might do it too. 647 */ 648 if (limit_2 < 0) { 649 ohci_dbg(ohci, 650 "port[%d] reset timeout, stat %08x\n", 651 port, temp); 652 break; 653 } 654 655 if (!(temp & RH_PS_CCS)) 656 break; 657 if (temp & RH_PS_PRSC) 658 ohci_writel (ohci, RH_PS_PRSC, portstat); 659 660 /* start the next reset, sleep till it's probably done */ 661 ohci_writel (ohci, RH_PS_PRS, portstat); 662 msleep(PORT_RESET_HW_MSEC); 663 now = ohci_readl(ohci, &ohci->regs->fmnumber); 664 } while (tick_before(now, reset_done) && --limit_1 >= 0); 665 666 /* caller synchronizes using PRSC ... and handles PRS 667 * still being set when this returns. 668 */ 669 670 return 0; 671 } 672 673 int ohci_hub_control( 674 struct usb_hcd *hcd, 675 u16 typeReq, 676 u16 wValue, 677 u16 wIndex, 678 char *buf, 679 u16 wLength 680 ) { 681 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 682 int ports = ohci->num_ports; 683 u32 temp; 684 int retval = 0; 685 686 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 687 return -ESHUTDOWN; 688 689 switch (typeReq) { 690 case ClearHubFeature: 691 switch (wValue) { 692 case C_HUB_OVER_CURRENT: 693 ohci_writel (ohci, RH_HS_OCIC, 694 &ohci->regs->roothub.status); 695 case C_HUB_LOCAL_POWER: 696 break; 697 default: 698 goto error; 699 } 700 break; 701 case ClearPortFeature: 702 if (!wIndex || wIndex > ports) 703 goto error; 704 wIndex--; 705 706 switch (wValue) { 707 case USB_PORT_FEAT_ENABLE: 708 temp = RH_PS_CCS; 709 break; 710 case USB_PORT_FEAT_C_ENABLE: 711 temp = RH_PS_PESC; 712 break; 713 case USB_PORT_FEAT_SUSPEND: 714 temp = RH_PS_POCI; 715 break; 716 case USB_PORT_FEAT_C_SUSPEND: 717 temp = RH_PS_PSSC; 718 break; 719 case USB_PORT_FEAT_POWER: 720 temp = RH_PS_LSDA; 721 break; 722 case USB_PORT_FEAT_C_CONNECTION: 723 temp = RH_PS_CSC; 724 break; 725 case USB_PORT_FEAT_C_OVER_CURRENT: 726 temp = RH_PS_OCIC; 727 break; 728 case USB_PORT_FEAT_C_RESET: 729 temp = RH_PS_PRSC; 730 break; 731 default: 732 goto error; 733 } 734 ohci_writel (ohci, temp, 735 &ohci->regs->roothub.portstatus [wIndex]); 736 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); 737 break; 738 case GetHubDescriptor: 739 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf); 740 break; 741 case GetHubStatus: 742 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); 743 put_unaligned_le32(temp, buf); 744 break; 745 case GetPortStatus: 746 if (!wIndex || wIndex > ports) 747 goto error; 748 wIndex--; 749 temp = roothub_portstatus (ohci, wIndex); 750 put_unaligned_le32(temp, buf); 751 752 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ 753 dbg_port(ohci, "GetStatus", wIndex, temp); 754 break; 755 case SetHubFeature: 756 switch (wValue) { 757 case C_HUB_OVER_CURRENT: 758 // FIXME: this can be cleared, yes? 759 case C_HUB_LOCAL_POWER: 760 break; 761 default: 762 goto error; 763 } 764 break; 765 case SetPortFeature: 766 if (!wIndex || wIndex > ports) 767 goto error; 768 wIndex--; 769 switch (wValue) { 770 case USB_PORT_FEAT_SUSPEND: 771 #ifdef CONFIG_USB_OTG 772 if (hcd->self.otg_port == (wIndex + 1) 773 && hcd->self.b_hnp_enable) 774 ohci->start_hnp(ohci); 775 else 776 #endif 777 ohci_writel (ohci, RH_PS_PSS, 778 &ohci->regs->roothub.portstatus [wIndex]); 779 break; 780 case USB_PORT_FEAT_POWER: 781 ohci_writel (ohci, RH_PS_PPS, 782 &ohci->regs->roothub.portstatus [wIndex]); 783 break; 784 case USB_PORT_FEAT_RESET: 785 retval = root_port_reset (ohci, wIndex); 786 break; 787 default: 788 goto error; 789 } 790 break; 791 792 default: 793 error: 794 /* "protocol stall" on error */ 795 retval = -EPIPE; 796 } 797 return retval; 798 } 799 EXPORT_SYMBOL_GPL(ohci_hub_control); 800