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 } 115 116 done: 117 return status; 118 } 119 120 static 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 */ 129 static 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 */ 218 219 skip_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 } 279 280 static 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(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) 288 rc = -ESHUTDOWN; 289 else 290 rc = ohci_rh_suspend (ohci, 0); 291 spin_unlock_irq (&ohci->lock); 292 return rc; 293 } 294 295 static 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(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) 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 */ 318 static 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 } 359 360 /* Carry out polling-, autostop-, and autoresume-related state changes */ 361 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 362 int any_connected, int rhsc_status) 363 { 364 int poll_rh = 1; 365 int rhsc_enable; 366 367 /* Some broken controllers never turn off RHCS in the interrupt 368 * status register. For their sake we won't re-enable RHSC 369 * interrupts if the interrupt bit is already active. 370 */ 371 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & 372 OHCI_INTR_RHSC; 373 374 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 375 case OHCI_USB_OPER: 376 /* If no status changes are pending, enable RHSC interrupts. */ 377 if (!rhsc_enable && !rhsc_status && !changed) { 378 rhsc_enable = OHCI_INTR_RHSC; 379 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); 380 } 381 382 /* Keep on polling until we know a device is connected 383 * and RHSC is enabled, or until we autostop. 384 */ 385 if (!ohci->autostop) { 386 if (any_connected || 387 !device_may_wakeup(&ohci_to_hcd(ohci) 388 ->self.root_hub->dev)) { 389 if (rhsc_enable) 390 poll_rh = 0; 391 } else { 392 ohci->autostop = 1; 393 ohci->next_statechange = jiffies + HZ; 394 } 395 396 /* if no devices have been attached for one second, autostop */ 397 } else { 398 if (changed || any_connected) { 399 ohci->autostop = 0; 400 ohci->next_statechange = jiffies + 401 STATECHANGE_DELAY; 402 } else if (time_after_eq(jiffies, 403 ohci->next_statechange) 404 && !ohci->ed_rm_list 405 && !(ohci->hc_control & 406 OHCI_SCHED_ENABLES)) { 407 ohci_rh_suspend(ohci, 1); 408 if (rhsc_enable) 409 poll_rh = 0; 410 } 411 } 412 break; 413 414 case OHCI_USB_SUSPEND: 415 case OHCI_USB_RESUME: 416 /* if there is a port change, autostart or ask to be resumed */ 417 if (changed) { 418 if (ohci->autostop) 419 ohci_rh_resume(ohci); 420 else 421 usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); 422 423 /* If remote wakeup is disabled, stop polling */ 424 } else if (!ohci->autostop && 425 !ohci_to_hcd(ohci)->self.root_hub-> 426 do_remote_wakeup) { 427 poll_rh = 0; 428 429 } else { 430 /* If no status changes are pending, 431 * enable RHSC interrupts 432 */ 433 if (!rhsc_enable && !rhsc_status) { 434 rhsc_enable = OHCI_INTR_RHSC; 435 ohci_writel(ohci, rhsc_enable, 436 &ohci->regs->intrenable); 437 } 438 /* Keep polling until RHSC is enabled */ 439 if (rhsc_enable) 440 poll_rh = 0; 441 } 442 break; 443 } 444 return poll_rh; 445 } 446 447 #else /* CONFIG_PM */ 448 449 static inline int ohci_rh_resume(struct ohci_hcd *ohci) 450 { 451 return 0; 452 } 453 454 /* Carry out polling-related state changes. 455 * autostop isn't used when CONFIG_PM is turned off. 456 */ 457 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 458 int any_connected, int rhsc_status) 459 { 460 /* If RHSC is enabled, don't poll */ 461 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) 462 return 0; 463 464 /* If status changes are pending, continue polling. 465 * Conversely, if no status changes are pending but the RHSC 466 * status bit was set, then RHSC may be broken so continue polling. 467 */ 468 if (changed || rhsc_status) 469 return 1; 470 471 /* It's safe to re-enable RHSC interrupts */ 472 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); 473 return 0; 474 } 475 476 #endif /* CONFIG_PM */ 477 478 /*-------------------------------------------------------------------------*/ 479 480 /* build "status change" packet (one or two bytes) from HC registers */ 481 482 static int 483 ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 484 { 485 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 486 int i, changed = 0, length = 1; 487 int any_connected = 0; 488 int rhsc_status; 489 unsigned long flags; 490 491 spin_lock_irqsave (&ohci->lock, flags); 492 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) 493 goto done; 494 495 /* undocumented erratum seen on at least rev D */ 496 if ((ohci->flags & OHCI_QUIRK_AMD756) 497 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { 498 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", 499 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); 500 /* retry later; "should not happen" */ 501 goto done; 502 } 503 504 /* init status */ 505 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) 506 buf [0] = changed = 1; 507 else 508 buf [0] = 0; 509 if (ohci->num_ports > 7) { 510 buf [1] = 0; 511 length++; 512 } 513 514 /* Clear the RHSC status flag before reading the port statuses */ 515 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus); 516 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & 517 OHCI_INTR_RHSC; 518 519 /* look at each port */ 520 for (i = 0; i < ohci->num_ports; i++) { 521 u32 status = roothub_portstatus (ohci, i); 522 523 /* can't autostop if ports are connected */ 524 any_connected |= (status & RH_PS_CCS); 525 526 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC 527 | RH_PS_OCIC | RH_PS_PRSC)) { 528 changed = 1; 529 if (i < 7) 530 buf [0] |= 1 << (i + 1); 531 else 532 buf [1] |= 1 << (i - 7); 533 } 534 } 535 536 hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed, 537 any_connected, rhsc_status); 538 539 done: 540 spin_unlock_irqrestore (&ohci->lock, flags); 541 542 return changed ? length : 0; 543 } 544 545 /*-------------------------------------------------------------------------*/ 546 547 static void 548 ohci_hub_descriptor ( 549 struct ohci_hcd *ohci, 550 struct usb_hub_descriptor *desc 551 ) { 552 u32 rh = roothub_a (ohci); 553 u16 temp; 554 555 desc->bDescriptorType = 0x29; 556 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; 557 desc->bHubContrCurrent = 0; 558 559 desc->bNbrPorts = ohci->num_ports; 560 temp = 1 + (ohci->num_ports / 8); 561 desc->bDescLength = 7 + 2 * temp; 562 563 temp = 0; 564 if (rh & RH_A_NPS) /* no power switching? */ 565 temp |= 0x0002; 566 if (rh & RH_A_PSM) /* per-port power switching? */ 567 temp |= 0x0001; 568 if (rh & RH_A_NOCP) /* no overcurrent reporting? */ 569 temp |= 0x0010; 570 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ 571 temp |= 0x0008; 572 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp); 573 574 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ 575 rh = roothub_b (ohci); 576 memset(desc->bitmap, 0xff, sizeof(desc->bitmap)); 577 desc->bitmap [0] = rh & RH_B_DR; 578 if (ohci->num_ports > 7) { 579 desc->bitmap [1] = (rh & RH_B_DR) >> 8; 580 desc->bitmap [2] = 0xff; 581 } else 582 desc->bitmap [1] = 0xff; 583 } 584 585 /*-------------------------------------------------------------------------*/ 586 587 #ifdef CONFIG_USB_OTG 588 589 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) 590 { 591 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 592 u32 status; 593 594 if (!port) 595 return -EINVAL; 596 port--; 597 598 /* start port reset before HNP protocol times out */ 599 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); 600 if (!(status & RH_PS_CCS)) 601 return -ENODEV; 602 603 /* khubd will finish the reset later */ 604 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); 605 return 0; 606 } 607 608 #else 609 610 #define ohci_start_port_reset NULL 611 612 #endif 613 614 /*-------------------------------------------------------------------------*/ 615 616 617 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, 618 * not necessarily continuous ... to guard against resume signaling. 619 * The short timeout is safe for non-root hubs, and is backward-compatible 620 * with earlier Linux hosts. 621 */ 622 #ifdef CONFIG_USB_SUSPEND 623 #define PORT_RESET_MSEC 50 624 #else 625 #define PORT_RESET_MSEC 10 626 #endif 627 628 /* this timer value might be vendor-specific ... */ 629 #define PORT_RESET_HW_MSEC 10 630 631 /* wrap-aware logic morphed from <linux/jiffies.h> */ 632 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) 633 634 /* called from some task, normally khubd */ 635 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port) 636 { 637 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; 638 u32 temp = 0; 639 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); 640 u16 reset_done = now + PORT_RESET_MSEC; 641 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC); 642 643 /* build a "continuous enough" reset signal, with up to 644 * 3msec gap between pulses. scheduler HZ==100 must work; 645 * this might need to be deadline-scheduled. 646 */ 647 do { 648 int limit_2; 649 650 /* spin until any current reset finishes */ 651 limit_2 = PORT_RESET_HW_MSEC * 2; 652 while (--limit_2 >= 0) { 653 temp = ohci_readl (ohci, portstat); 654 /* handle e.g. CardBus eject */ 655 if (temp == ~(u32)0) 656 return -ESHUTDOWN; 657 if (!(temp & RH_PS_PRS)) 658 break; 659 udelay (500); 660 } 661 662 /* timeout (a hardware error) has been observed when 663 * EHCI sets CF while this driver is resetting a port; 664 * presumably other disconnect paths might do it too. 665 */ 666 if (limit_2 < 0) { 667 ohci_dbg(ohci, 668 "port[%d] reset timeout, stat %08x\n", 669 port, temp); 670 break; 671 } 672 673 if (!(temp & RH_PS_CCS)) 674 break; 675 if (temp & RH_PS_PRSC) 676 ohci_writel (ohci, RH_PS_PRSC, portstat); 677 678 /* start the next reset, sleep till it's probably done */ 679 ohci_writel (ohci, RH_PS_PRS, portstat); 680 msleep(PORT_RESET_HW_MSEC); 681 now = ohci_readl(ohci, &ohci->regs->fmnumber); 682 } while (tick_before(now, reset_done) && --limit_1 >= 0); 683 684 /* caller synchronizes using PRSC ... and handles PRS 685 * still being set when this returns. 686 */ 687 688 return 0; 689 } 690 691 static int ohci_hub_control ( 692 struct usb_hcd *hcd, 693 u16 typeReq, 694 u16 wValue, 695 u16 wIndex, 696 char *buf, 697 u16 wLength 698 ) { 699 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 700 int ports = hcd_to_bus (hcd)->root_hub->maxchild; 701 u32 temp; 702 int retval = 0; 703 704 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) 705 return -ESHUTDOWN; 706 707 switch (typeReq) { 708 case ClearHubFeature: 709 switch (wValue) { 710 case C_HUB_OVER_CURRENT: 711 ohci_writel (ohci, RH_HS_OCIC, 712 &ohci->regs->roothub.status); 713 case C_HUB_LOCAL_POWER: 714 break; 715 default: 716 goto error; 717 } 718 break; 719 case ClearPortFeature: 720 if (!wIndex || wIndex > ports) 721 goto error; 722 wIndex--; 723 724 switch (wValue) { 725 case USB_PORT_FEAT_ENABLE: 726 temp = RH_PS_CCS; 727 break; 728 case USB_PORT_FEAT_C_ENABLE: 729 temp = RH_PS_PESC; 730 break; 731 case USB_PORT_FEAT_SUSPEND: 732 temp = RH_PS_POCI; 733 break; 734 case USB_PORT_FEAT_C_SUSPEND: 735 temp = RH_PS_PSSC; 736 break; 737 case USB_PORT_FEAT_POWER: 738 temp = RH_PS_LSDA; 739 break; 740 case USB_PORT_FEAT_C_CONNECTION: 741 temp = RH_PS_CSC; 742 break; 743 case USB_PORT_FEAT_C_OVER_CURRENT: 744 temp = RH_PS_OCIC; 745 break; 746 case USB_PORT_FEAT_C_RESET: 747 temp = RH_PS_PRSC; 748 break; 749 default: 750 goto error; 751 } 752 ohci_writel (ohci, temp, 753 &ohci->regs->roothub.portstatus [wIndex]); 754 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); 755 break; 756 case GetHubDescriptor: 757 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf); 758 break; 759 case GetHubStatus: 760 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); 761 put_unaligned_le32(temp, buf); 762 break; 763 case GetPortStatus: 764 if (!wIndex || wIndex > ports) 765 goto error; 766 wIndex--; 767 temp = roothub_portstatus (ohci, wIndex); 768 put_unaligned_le32(temp, buf); 769 770 #ifndef OHCI_VERBOSE_DEBUG 771 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ 772 #endif 773 dbg_port (ohci, "GetStatus", wIndex, temp); 774 break; 775 case SetHubFeature: 776 switch (wValue) { 777 case C_HUB_OVER_CURRENT: 778 // FIXME: this can be cleared, yes? 779 case C_HUB_LOCAL_POWER: 780 break; 781 default: 782 goto error; 783 } 784 break; 785 case SetPortFeature: 786 if (!wIndex || wIndex > ports) 787 goto error; 788 wIndex--; 789 switch (wValue) { 790 case USB_PORT_FEAT_SUSPEND: 791 #ifdef CONFIG_USB_OTG 792 if (hcd->self.otg_port == (wIndex + 1) 793 && hcd->self.b_hnp_enable) 794 ohci->start_hnp(ohci); 795 else 796 #endif 797 ohci_writel (ohci, RH_PS_PSS, 798 &ohci->regs->roothub.portstatus [wIndex]); 799 break; 800 case USB_PORT_FEAT_POWER: 801 ohci_writel (ohci, RH_PS_PPS, 802 &ohci->regs->roothub.portstatus [wIndex]); 803 break; 804 case USB_PORT_FEAT_RESET: 805 retval = root_port_reset (ohci, wIndex); 806 break; 807 default: 808 goto error; 809 } 810 break; 811 812 default: 813 error: 814 /* "protocol stall" on error */ 815 retval = -EPIPE; 816 } 817 return retval; 818 } 819 820