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 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 ohci->rh_state = OHCI_RH_RUNNING; 278 return 0; 279 } 280 281 static int ohci_bus_suspend (struct usb_hcd *hcd) 282 { 283 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 284 int rc; 285 286 spin_lock_irq (&ohci->lock); 287 288 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 289 rc = -ESHUTDOWN; 290 else 291 rc = ohci_rh_suspend (ohci, 0); 292 spin_unlock_irq (&ohci->lock); 293 return rc; 294 } 295 296 static int ohci_bus_resume (struct usb_hcd *hcd) 297 { 298 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 299 int rc; 300 301 if (time_before (jiffies, ohci->next_statechange)) 302 msleep(5); 303 304 spin_lock_irq (&ohci->lock); 305 306 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 307 rc = -ESHUTDOWN; 308 else 309 rc = ohci_rh_resume (ohci); 310 spin_unlock_irq (&ohci->lock); 311 312 /* poll until we know a device is connected or we autostop */ 313 if (rc == 0) 314 usb_hcd_poll_rh_status(hcd); 315 return rc; 316 } 317 318 /* Carry out polling-, autostop-, and autoresume-related state changes */ 319 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 320 int any_connected, int rhsc_status) 321 { 322 int poll_rh = 1; 323 int rhsc_enable; 324 325 /* Some broken controllers never turn off RHSC in the interrupt 326 * status register. For their sake we won't re-enable RHSC 327 * interrupts if the interrupt bit is already active. 328 */ 329 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & 330 OHCI_INTR_RHSC; 331 332 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 333 case OHCI_USB_OPER: 334 /* If no status changes are pending, enable RHSC interrupts. */ 335 if (!rhsc_enable && !rhsc_status && !changed) { 336 rhsc_enable = OHCI_INTR_RHSC; 337 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); 338 } 339 340 /* Keep on polling until we know a device is connected 341 * and RHSC is enabled, or until we autostop. 342 */ 343 if (!ohci->autostop) { 344 if (any_connected || 345 !device_may_wakeup(&ohci_to_hcd(ohci) 346 ->self.root_hub->dev)) { 347 if (rhsc_enable) 348 poll_rh = 0; 349 } else { 350 ohci->autostop = 1; 351 ohci->next_statechange = jiffies + HZ; 352 } 353 354 /* if no devices have been attached for one second, autostop */ 355 } else { 356 if (changed || any_connected) { 357 ohci->autostop = 0; 358 ohci->next_statechange = jiffies + 359 STATECHANGE_DELAY; 360 } else if (time_after_eq(jiffies, 361 ohci->next_statechange) 362 && !ohci->ed_rm_list 363 && !(ohci->hc_control & 364 OHCI_SCHED_ENABLES)) { 365 ohci_rh_suspend(ohci, 1); 366 if (rhsc_enable) 367 poll_rh = 0; 368 } 369 } 370 break; 371 372 case OHCI_USB_SUSPEND: 373 case OHCI_USB_RESUME: 374 /* if there is a port change, autostart or ask to be resumed */ 375 if (changed) { 376 if (ohci->autostop) 377 ohci_rh_resume(ohci); 378 else 379 usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); 380 381 /* If remote wakeup is disabled, stop polling */ 382 } else if (!ohci->autostop && 383 !ohci_to_hcd(ohci)->self.root_hub-> 384 do_remote_wakeup) { 385 poll_rh = 0; 386 387 } else { 388 /* If no status changes are pending, 389 * enable RHSC interrupts 390 */ 391 if (!rhsc_enable && !rhsc_status) { 392 rhsc_enable = OHCI_INTR_RHSC; 393 ohci_writel(ohci, rhsc_enable, 394 &ohci->regs->intrenable); 395 } 396 /* Keep polling until RHSC is enabled */ 397 if (rhsc_enable) 398 poll_rh = 0; 399 } 400 break; 401 } 402 return poll_rh; 403 } 404 405 #else /* CONFIG_PM */ 406 407 static inline int ohci_rh_resume(struct ohci_hcd *ohci) 408 { 409 return 0; 410 } 411 412 /* Carry out polling-related state changes. 413 * autostop isn't used when CONFIG_PM is turned off. 414 */ 415 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 416 int any_connected, int rhsc_status) 417 { 418 /* If RHSC is enabled, don't poll */ 419 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) 420 return 0; 421 422 /* If status changes are pending, continue polling. 423 * Conversely, if no status changes are pending but the RHSC 424 * status bit was set, then RHSC may be broken so continue polling. 425 */ 426 if (changed || rhsc_status) 427 return 1; 428 429 /* It's safe to re-enable RHSC interrupts */ 430 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); 431 return 0; 432 } 433 434 #endif /* CONFIG_PM */ 435 436 /*-------------------------------------------------------------------------*/ 437 438 /* build "status change" packet (one or two bytes) from HC registers */ 439 440 static int 441 ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 442 { 443 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 444 int i, changed = 0, length = 1; 445 int any_connected = 0; 446 int rhsc_status; 447 unsigned long flags; 448 449 spin_lock_irqsave (&ohci->lock, flags); 450 if (!HCD_HW_ACCESSIBLE(hcd)) 451 goto done; 452 453 /* undocumented erratum seen on at least rev D */ 454 if ((ohci->flags & OHCI_QUIRK_AMD756) 455 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { 456 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", 457 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); 458 /* retry later; "should not happen" */ 459 goto done; 460 } 461 462 /* init status */ 463 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) 464 buf [0] = changed = 1; 465 else 466 buf [0] = 0; 467 if (ohci->num_ports > 7) { 468 buf [1] = 0; 469 length++; 470 } 471 472 /* Clear the RHSC status flag before reading the port statuses */ 473 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus); 474 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & 475 OHCI_INTR_RHSC; 476 477 /* look at each port */ 478 for (i = 0; i < ohci->num_ports; i++) { 479 u32 status = roothub_portstatus (ohci, i); 480 481 /* can't autostop if ports are connected */ 482 any_connected |= (status & RH_PS_CCS); 483 484 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC 485 | RH_PS_OCIC | RH_PS_PRSC)) { 486 changed = 1; 487 if (i < 7) 488 buf [0] |= 1 << (i + 1); 489 else 490 buf [1] |= 1 << (i - 7); 491 } 492 } 493 494 if (ohci_root_hub_state_changes(ohci, changed, 495 any_connected, rhsc_status)) 496 set_bit(HCD_FLAG_POLL_RH, &hcd->flags); 497 else 498 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); 499 500 501 done: 502 spin_unlock_irqrestore (&ohci->lock, flags); 503 504 return changed ? length : 0; 505 } 506 507 /*-------------------------------------------------------------------------*/ 508 509 static void 510 ohci_hub_descriptor ( 511 struct ohci_hcd *ohci, 512 struct usb_hub_descriptor *desc 513 ) { 514 u32 rh = roothub_a (ohci); 515 u16 temp; 516 517 desc->bDescriptorType = 0x29; 518 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; 519 desc->bHubContrCurrent = 0; 520 521 desc->bNbrPorts = ohci->num_ports; 522 temp = 1 + (ohci->num_ports / 8); 523 desc->bDescLength = 7 + 2 * temp; 524 525 temp = 0; 526 if (rh & RH_A_NPS) /* no power switching? */ 527 temp |= 0x0002; 528 if (rh & RH_A_PSM) /* per-port power switching? */ 529 temp |= 0x0001; 530 if (rh & RH_A_NOCP) /* no overcurrent reporting? */ 531 temp |= 0x0010; 532 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ 533 temp |= 0x0008; 534 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp); 535 536 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */ 537 rh = roothub_b (ohci); 538 memset(desc->u.hs.DeviceRemovable, 0xff, 539 sizeof(desc->u.hs.DeviceRemovable)); 540 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR; 541 if (ohci->num_ports > 7) { 542 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8; 543 desc->u.hs.DeviceRemovable[2] = 0xff; 544 } else 545 desc->u.hs.DeviceRemovable[1] = 0xff; 546 } 547 548 /*-------------------------------------------------------------------------*/ 549 550 #ifdef CONFIG_USB_OTG 551 552 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) 553 { 554 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 555 u32 status; 556 557 if (!port) 558 return -EINVAL; 559 port--; 560 561 /* start port reset before HNP protocol times out */ 562 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); 563 if (!(status & RH_PS_CCS)) 564 return -ENODEV; 565 566 /* khubd will finish the reset later */ 567 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); 568 return 0; 569 } 570 571 #else 572 573 #define ohci_start_port_reset NULL 574 575 #endif 576 577 /*-------------------------------------------------------------------------*/ 578 579 580 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, 581 * not necessarily continuous ... to guard against resume signaling. 582 */ 583 #define PORT_RESET_MSEC 50 584 585 /* this timer value might be vendor-specific ... */ 586 #define PORT_RESET_HW_MSEC 10 587 588 /* wrap-aware logic morphed from <linux/jiffies.h> */ 589 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) 590 591 /* called from some task, normally khubd */ 592 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port) 593 { 594 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; 595 u32 temp = 0; 596 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); 597 u16 reset_done = now + PORT_RESET_MSEC; 598 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC); 599 600 /* build a "continuous enough" reset signal, with up to 601 * 3msec gap between pulses. scheduler HZ==100 must work; 602 * this might need to be deadline-scheduled. 603 */ 604 do { 605 int limit_2; 606 607 /* spin until any current reset finishes */ 608 limit_2 = PORT_RESET_HW_MSEC * 2; 609 while (--limit_2 >= 0) { 610 temp = ohci_readl (ohci, portstat); 611 /* handle e.g. CardBus eject */ 612 if (temp == ~(u32)0) 613 return -ESHUTDOWN; 614 if (!(temp & RH_PS_PRS)) 615 break; 616 udelay (500); 617 } 618 619 /* timeout (a hardware error) has been observed when 620 * EHCI sets CF while this driver is resetting a port; 621 * presumably other disconnect paths might do it too. 622 */ 623 if (limit_2 < 0) { 624 ohci_dbg(ohci, 625 "port[%d] reset timeout, stat %08x\n", 626 port, temp); 627 break; 628 } 629 630 if (!(temp & RH_PS_CCS)) 631 break; 632 if (temp & RH_PS_PRSC) 633 ohci_writel (ohci, RH_PS_PRSC, portstat); 634 635 /* start the next reset, sleep till it's probably done */ 636 ohci_writel (ohci, RH_PS_PRS, portstat); 637 msleep(PORT_RESET_HW_MSEC); 638 now = ohci_readl(ohci, &ohci->regs->fmnumber); 639 } while (tick_before(now, reset_done) && --limit_1 >= 0); 640 641 /* caller synchronizes using PRSC ... and handles PRS 642 * still being set when this returns. 643 */ 644 645 return 0; 646 } 647 648 static int ohci_hub_control ( 649 struct usb_hcd *hcd, 650 u16 typeReq, 651 u16 wValue, 652 u16 wIndex, 653 char *buf, 654 u16 wLength 655 ) { 656 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 657 int ports = ohci->num_ports; 658 u32 temp; 659 int retval = 0; 660 661 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 662 return -ESHUTDOWN; 663 664 switch (typeReq) { 665 case ClearHubFeature: 666 switch (wValue) { 667 case C_HUB_OVER_CURRENT: 668 ohci_writel (ohci, RH_HS_OCIC, 669 &ohci->regs->roothub.status); 670 case C_HUB_LOCAL_POWER: 671 break; 672 default: 673 goto error; 674 } 675 break; 676 case ClearPortFeature: 677 if (!wIndex || wIndex > ports) 678 goto error; 679 wIndex--; 680 681 switch (wValue) { 682 case USB_PORT_FEAT_ENABLE: 683 temp = RH_PS_CCS; 684 break; 685 case USB_PORT_FEAT_C_ENABLE: 686 temp = RH_PS_PESC; 687 break; 688 case USB_PORT_FEAT_SUSPEND: 689 temp = RH_PS_POCI; 690 break; 691 case USB_PORT_FEAT_C_SUSPEND: 692 temp = RH_PS_PSSC; 693 break; 694 case USB_PORT_FEAT_POWER: 695 temp = RH_PS_LSDA; 696 break; 697 case USB_PORT_FEAT_C_CONNECTION: 698 temp = RH_PS_CSC; 699 break; 700 case USB_PORT_FEAT_C_OVER_CURRENT: 701 temp = RH_PS_OCIC; 702 break; 703 case USB_PORT_FEAT_C_RESET: 704 temp = RH_PS_PRSC; 705 break; 706 default: 707 goto error; 708 } 709 ohci_writel (ohci, temp, 710 &ohci->regs->roothub.portstatus [wIndex]); 711 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); 712 break; 713 case GetHubDescriptor: 714 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf); 715 break; 716 case GetHubStatus: 717 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); 718 put_unaligned_le32(temp, buf); 719 break; 720 case GetPortStatus: 721 if (!wIndex || wIndex > ports) 722 goto error; 723 wIndex--; 724 temp = roothub_portstatus (ohci, wIndex); 725 put_unaligned_le32(temp, buf); 726 727 #ifndef OHCI_VERBOSE_DEBUG 728 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ 729 #endif 730 dbg_port (ohci, "GetStatus", wIndex, temp); 731 break; 732 case SetHubFeature: 733 switch (wValue) { 734 case C_HUB_OVER_CURRENT: 735 // FIXME: this can be cleared, yes? 736 case C_HUB_LOCAL_POWER: 737 break; 738 default: 739 goto error; 740 } 741 break; 742 case SetPortFeature: 743 if (!wIndex || wIndex > ports) 744 goto error; 745 wIndex--; 746 switch (wValue) { 747 case USB_PORT_FEAT_SUSPEND: 748 #ifdef CONFIG_USB_OTG 749 if (hcd->self.otg_port == (wIndex + 1) 750 && hcd->self.b_hnp_enable) 751 ohci->start_hnp(ohci); 752 else 753 #endif 754 ohci_writel (ohci, RH_PS_PSS, 755 &ohci->regs->roothub.portstatus [wIndex]); 756 break; 757 case USB_PORT_FEAT_POWER: 758 ohci_writel (ohci, RH_PS_PPS, 759 &ohci->regs->roothub.portstatus [wIndex]); 760 break; 761 case USB_PORT_FEAT_RESET: 762 retval = root_port_reset (ohci, wIndex); 763 break; 764 default: 765 goto error; 766 } 767 break; 768 769 default: 770 error: 771 /* "protocol stall" on error */ 772 retval = -EPIPE; 773 } 774 return retval; 775 } 776 777