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 /* 216 * The following code is executed with ohci->lock held and 217 * irqs disabled if and only if autostopped is true. This 218 * will cause sparse to warn about a "context imbalance". 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 polling-, autostop-, and autoresume-related state changes */ 320 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 321 int any_connected, int rhsc_status) 322 { 323 int poll_rh = 1; 324 int rhsc_enable; 325 326 /* Some broken controllers never turn off RHSC in the interrupt 327 * status register. For their sake we won't re-enable RHSC 328 * interrupts if the interrupt bit is already active. 329 */ 330 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & 331 OHCI_INTR_RHSC; 332 333 switch (ohci->hc_control & OHCI_CTRL_HCFS) { 334 case OHCI_USB_OPER: 335 /* If no status changes are pending, enable RHSC interrupts. */ 336 if (!rhsc_enable && !rhsc_status && !changed) { 337 rhsc_enable = OHCI_INTR_RHSC; 338 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); 339 } 340 341 /* Keep on polling until we know a device is connected 342 * and RHSC is enabled, or until we autostop. 343 */ 344 if (!ohci->autostop) { 345 if (any_connected || 346 !device_may_wakeup(&ohci_to_hcd(ohci) 347 ->self.root_hub->dev)) { 348 if (rhsc_enable) 349 poll_rh = 0; 350 } else { 351 ohci->autostop = 1; 352 ohci->next_statechange = jiffies + HZ; 353 } 354 355 /* if no devices have been attached for one second, autostop */ 356 } else { 357 if (changed || any_connected) { 358 ohci->autostop = 0; 359 ohci->next_statechange = jiffies + 360 STATECHANGE_DELAY; 361 } else if (time_after_eq(jiffies, 362 ohci->next_statechange) 363 && !ohci->ed_rm_list 364 && !(ohci->hc_control & 365 OHCI_SCHED_ENABLES)) { 366 ohci_rh_suspend(ohci, 1); 367 if (rhsc_enable) 368 poll_rh = 0; 369 } 370 } 371 break; 372 373 case OHCI_USB_SUSPEND: 374 case OHCI_USB_RESUME: 375 /* if there is a port change, autostart or ask to be resumed */ 376 if (changed) { 377 if (ohci->autostop) 378 ohci_rh_resume(ohci); 379 else 380 usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); 381 382 /* If remote wakeup is disabled, stop polling */ 383 } else if (!ohci->autostop && 384 !ohci_to_hcd(ohci)->self.root_hub-> 385 do_remote_wakeup) { 386 poll_rh = 0; 387 388 } else { 389 /* If no status changes are pending, 390 * enable RHSC interrupts 391 */ 392 if (!rhsc_enable && !rhsc_status) { 393 rhsc_enable = OHCI_INTR_RHSC; 394 ohci_writel(ohci, rhsc_enable, 395 &ohci->regs->intrenable); 396 } 397 /* Keep polling until RHSC is enabled */ 398 if (rhsc_enable) 399 poll_rh = 0; 400 } 401 break; 402 } 403 return poll_rh; 404 } 405 406 #else /* CONFIG_PM */ 407 408 static inline int ohci_rh_resume(struct ohci_hcd *ohci) 409 { 410 return 0; 411 } 412 413 /* Carry out polling-related state changes. 414 * autostop isn't used when CONFIG_PM is turned off. 415 */ 416 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, 417 int any_connected, int rhsc_status) 418 { 419 /* If RHSC is enabled, don't poll */ 420 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) 421 return 0; 422 423 /* If status changes are pending, continue polling. 424 * Conversely, if no status changes are pending but the RHSC 425 * status bit was set, then RHSC may be broken so continue polling. 426 */ 427 if (changed || rhsc_status) 428 return 1; 429 430 /* It's safe to re-enable RHSC interrupts */ 431 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); 432 return 0; 433 } 434 435 #endif /* CONFIG_PM */ 436 437 /*-------------------------------------------------------------------------*/ 438 439 /* build "status change" packet (one or two bytes) from HC registers */ 440 441 static int 442 ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 443 { 444 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 445 int i, changed = 0, length = 1; 446 int any_connected = 0; 447 int rhsc_status; 448 unsigned long flags; 449 450 spin_lock_irqsave (&ohci->lock, flags); 451 if (!HCD_HW_ACCESSIBLE(hcd)) 452 goto done; 453 454 /* undocumented erratum seen on at least rev D */ 455 if ((ohci->flags & OHCI_QUIRK_AMD756) 456 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { 457 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", 458 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); 459 /* retry later; "should not happen" */ 460 goto done; 461 } 462 463 /* init status */ 464 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) 465 buf [0] = changed = 1; 466 else 467 buf [0] = 0; 468 if (ohci->num_ports > 7) { 469 buf [1] = 0; 470 length++; 471 } 472 473 /* Clear the RHSC status flag before reading the port statuses */ 474 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus); 475 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & 476 OHCI_INTR_RHSC; 477 478 /* look at each port */ 479 for (i = 0; i < ohci->num_ports; i++) { 480 u32 status = roothub_portstatus (ohci, i); 481 482 /* can't autostop if ports are connected */ 483 any_connected |= (status & RH_PS_CCS); 484 485 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC 486 | RH_PS_OCIC | RH_PS_PRSC)) { 487 changed = 1; 488 if (i < 7) 489 buf [0] |= 1 << (i + 1); 490 else 491 buf [1] |= 1 << (i - 7); 492 } 493 } 494 495 if (ohci_root_hub_state_changes(ohci, changed, 496 any_connected, rhsc_status)) 497 set_bit(HCD_FLAG_POLL_RH, &hcd->flags); 498 else 499 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); 500 501 502 done: 503 spin_unlock_irqrestore (&ohci->lock, flags); 504 505 return changed ? length : 0; 506 } 507 508 /*-------------------------------------------------------------------------*/ 509 510 static void 511 ohci_hub_descriptor ( 512 struct ohci_hcd *ohci, 513 struct usb_hub_descriptor *desc 514 ) { 515 u32 rh = roothub_a (ohci); 516 u16 temp; 517 518 desc->bDescriptorType = 0x29; 519 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; 520 desc->bHubContrCurrent = 0; 521 522 desc->bNbrPorts = ohci->num_ports; 523 temp = 1 + (ohci->num_ports / 8); 524 desc->bDescLength = 7 + 2 * temp; 525 526 temp = 0; 527 if (rh & RH_A_NPS) /* no power switching? */ 528 temp |= 0x0002; 529 if (rh & RH_A_PSM) /* per-port power switching? */ 530 temp |= 0x0001; 531 if (rh & RH_A_NOCP) /* no overcurrent reporting? */ 532 temp |= 0x0010; 533 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ 534 temp |= 0x0008; 535 desc->wHubCharacteristics = cpu_to_le16(temp); 536 537 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */ 538 rh = roothub_b (ohci); 539 memset(desc->u.hs.DeviceRemovable, 0xff, 540 sizeof(desc->u.hs.DeviceRemovable)); 541 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR; 542 if (ohci->num_ports > 7) { 543 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8; 544 desc->u.hs.DeviceRemovable[2] = 0xff; 545 } else 546 desc->u.hs.DeviceRemovable[1] = 0xff; 547 } 548 549 /*-------------------------------------------------------------------------*/ 550 551 #ifdef CONFIG_USB_OTG 552 553 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) 554 { 555 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 556 u32 status; 557 558 if (!port) 559 return -EINVAL; 560 port--; 561 562 /* start port reset before HNP protocol times out */ 563 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); 564 if (!(status & RH_PS_CCS)) 565 return -ENODEV; 566 567 /* khubd will finish the reset later */ 568 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); 569 return 0; 570 } 571 572 #else 573 574 #define ohci_start_port_reset NULL 575 576 #endif 577 578 /*-------------------------------------------------------------------------*/ 579 580 581 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, 582 * not necessarily continuous ... to guard against resume signaling. 583 */ 584 #define PORT_RESET_MSEC 50 585 586 /* this timer value might be vendor-specific ... */ 587 #define PORT_RESET_HW_MSEC 10 588 589 /* wrap-aware logic morphed from <linux/jiffies.h> */ 590 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) 591 592 /* called from some task, normally khubd */ 593 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port) 594 { 595 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; 596 u32 temp = 0; 597 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); 598 u16 reset_done = now + PORT_RESET_MSEC; 599 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC); 600 601 /* build a "continuous enough" reset signal, with up to 602 * 3msec gap between pulses. scheduler HZ==100 must work; 603 * this might need to be deadline-scheduled. 604 */ 605 do { 606 int limit_2; 607 608 /* spin until any current reset finishes */ 609 limit_2 = PORT_RESET_HW_MSEC * 2; 610 while (--limit_2 >= 0) { 611 temp = ohci_readl (ohci, portstat); 612 /* handle e.g. CardBus eject */ 613 if (temp == ~(u32)0) 614 return -ESHUTDOWN; 615 if (!(temp & RH_PS_PRS)) 616 break; 617 udelay (500); 618 } 619 620 /* timeout (a hardware error) has been observed when 621 * EHCI sets CF while this driver is resetting a port; 622 * presumably other disconnect paths might do it too. 623 */ 624 if (limit_2 < 0) { 625 ohci_dbg(ohci, 626 "port[%d] reset timeout, stat %08x\n", 627 port, temp); 628 break; 629 } 630 631 if (!(temp & RH_PS_CCS)) 632 break; 633 if (temp & RH_PS_PRSC) 634 ohci_writel (ohci, RH_PS_PRSC, portstat); 635 636 /* start the next reset, sleep till it's probably done */ 637 ohci_writel (ohci, RH_PS_PRS, portstat); 638 msleep(PORT_RESET_HW_MSEC); 639 now = ohci_readl(ohci, &ohci->regs->fmnumber); 640 } while (tick_before(now, reset_done) && --limit_1 >= 0); 641 642 /* caller synchronizes using PRSC ... and handles PRS 643 * still being set when this returns. 644 */ 645 646 return 0; 647 } 648 649 static int ohci_hub_control ( 650 struct usb_hcd *hcd, 651 u16 typeReq, 652 u16 wValue, 653 u16 wIndex, 654 char *buf, 655 u16 wLength 656 ) { 657 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 658 int ports = ohci->num_ports; 659 u32 temp; 660 int retval = 0; 661 662 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) 663 return -ESHUTDOWN; 664 665 switch (typeReq) { 666 case ClearHubFeature: 667 switch (wValue) { 668 case C_HUB_OVER_CURRENT: 669 ohci_writel (ohci, RH_HS_OCIC, 670 &ohci->regs->roothub.status); 671 case C_HUB_LOCAL_POWER: 672 break; 673 default: 674 goto error; 675 } 676 break; 677 case ClearPortFeature: 678 if (!wIndex || wIndex > ports) 679 goto error; 680 wIndex--; 681 682 switch (wValue) { 683 case USB_PORT_FEAT_ENABLE: 684 temp = RH_PS_CCS; 685 break; 686 case USB_PORT_FEAT_C_ENABLE: 687 temp = RH_PS_PESC; 688 break; 689 case USB_PORT_FEAT_SUSPEND: 690 temp = RH_PS_POCI; 691 break; 692 case USB_PORT_FEAT_C_SUSPEND: 693 temp = RH_PS_PSSC; 694 break; 695 case USB_PORT_FEAT_POWER: 696 temp = RH_PS_LSDA; 697 break; 698 case USB_PORT_FEAT_C_CONNECTION: 699 temp = RH_PS_CSC; 700 break; 701 case USB_PORT_FEAT_C_OVER_CURRENT: 702 temp = RH_PS_OCIC; 703 break; 704 case USB_PORT_FEAT_C_RESET: 705 temp = RH_PS_PRSC; 706 break; 707 default: 708 goto error; 709 } 710 ohci_writel (ohci, temp, 711 &ohci->regs->roothub.portstatus [wIndex]); 712 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); 713 break; 714 case GetHubDescriptor: 715 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf); 716 break; 717 case GetHubStatus: 718 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); 719 put_unaligned_le32(temp, buf); 720 break; 721 case GetPortStatus: 722 if (!wIndex || wIndex > ports) 723 goto error; 724 wIndex--; 725 temp = roothub_portstatus (ohci, wIndex); 726 put_unaligned_le32(temp, buf); 727 728 #ifndef OHCI_VERBOSE_DEBUG 729 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ 730 #endif 731 dbg_port (ohci, "GetStatus", wIndex, temp); 732 break; 733 case SetHubFeature: 734 switch (wValue) { 735 case C_HUB_OVER_CURRENT: 736 // FIXME: this can be cleared, yes? 737 case C_HUB_LOCAL_POWER: 738 break; 739 default: 740 goto error; 741 } 742 break; 743 case SetPortFeature: 744 if (!wIndex || wIndex > ports) 745 goto error; 746 wIndex--; 747 switch (wValue) { 748 case USB_PORT_FEAT_SUSPEND: 749 #ifdef CONFIG_USB_OTG 750 if (hcd->self.otg_port == (wIndex + 1) 751 && hcd->self.b_hnp_enable) 752 ohci->start_hnp(ohci); 753 else 754 #endif 755 ohci_writel (ohci, RH_PS_PSS, 756 &ohci->regs->roothub.portstatus [wIndex]); 757 break; 758 case USB_PORT_FEAT_POWER: 759 ohci_writel (ohci, RH_PS_PPS, 760 &ohci->regs->roothub.portstatus [wIndex]); 761 break; 762 case USB_PORT_FEAT_RESET: 763 retval = root_port_reset (ohci, wIndex); 764 break; 765 default: 766 goto error; 767 } 768 break; 769 770 default: 771 error: 772 /* "protocol stall" on error */ 773 retval = -EPIPE; 774 } 775 return retval; 776 } 777 778