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