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