drivers/usb/host/ohci-hub.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * OHCI HCD (Host Controller Driver) for USB.
   4  *
   5  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   6  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
   7  *
   8  * This file is licenced under GPL
   9  */
  10
  11 /*-------------------------------------------------------------------------*/
  12
  13 /*
  14  * OHCI Root Hub ... the nonsharable stuff
  15  */
  16
  17 #define dbg_port(hc,label,num,value) \
  18         ohci_dbg (hc, \
  19                 "%s roothub.portstatus [%d] " \
  20                 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
  21                 label, num, value, \
  22                 (value & RH_PS_PRSC) ? " PRSC" : "", \
  23                 (value & RH_PS_OCIC) ? " OCIC" : "", \
  24                 (value & RH_PS_PSSC) ? " PSSC" : "", \
  25                 (value & RH_PS_PESC) ? " PESC" : "", \
  26                 (value & RH_PS_CSC) ? " CSC" : "", \
  27                 \
  28                 (value & RH_PS_LSDA) ? " LSDA" : "", \
  29                 (value & RH_PS_PPS) ? " PPS" : "", \
  30                 (value & RH_PS_PRS) ? " PRS" : "", \
  31                 (value & RH_PS_POCI) ? " POCI" : "", \
  32                 (value & RH_PS_PSS) ? " PSS" : "", \
  33                 \
  34                 (value & RH_PS_PES) ? " PES" : "", \
  35                 (value & RH_PS_CCS) ? " CCS" : "" \
  36                 );
  37
  38 /*-------------------------------------------------------------------------*/
  39
  40 #define OHCI_SCHED_ENABLES \
  41         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  42
  43 static void update_done_list(struct ohci_hcd *);
  44 static void ohci_work(struct ohci_hcd *);
  45
  46 #ifdef  CONFIG_PM
  47 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
  48 __releases(ohci->lock)
  49 __acquires(ohci->lock)
  50 {
  51         int                     status = 0;
  52
  53         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  54         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  55         case OHCI_USB_RESUME:
  56                 ohci_dbg (ohci, "resume/suspend?\n");
  57                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  58                 ohci->hc_control |= OHCI_USB_RESET;
  59                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  60                 (void) ohci_readl (ohci, &ohci->regs->control);
  61                 /* FALL THROUGH */
  62         case OHCI_USB_RESET:
  63                 status = -EBUSY;
  64                 ohci_dbg (ohci, "needs reinit!\n");
  65                 goto done;
  66         case OHCI_USB_SUSPEND:
  67                 if (!ohci->autostop) {
  68                         ohci_dbg (ohci, "already suspended\n");
  69                         goto done;
  70                 }
  71         }
  72         ohci_dbg (ohci, "%s root hub\n",
  73                         autostop ? "auto-stop" : "suspend");
  74
  75         /* First stop any processing */
  76         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
  77                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  78                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  79                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  80                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  81
  82                 /* sched disables take effect on the next frame,
  83                  * then the last WDH could take 6+ msec
  84                  */
  85                 ohci_dbg (ohci, "stopping schedules ...\n");
  86                 ohci->autostop = 0;
  87                 spin_unlock_irq (&ohci->lock);
  88                 msleep (8);
  89                 spin_lock_irq (&ohci->lock);
  90         }
  91         update_done_list(ohci);
  92         ohci_work(ohci);
  93
  94         /*
  95          * Some controllers don't handle "global" suspend properly if
  96          * there are unsuspended ports.  For these controllers, put all
  97          * the enabled ports into suspend before suspending the root hub.
  98          */
  99         if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
 100                 __hc32 __iomem  *portstat = ohci->regs->roothub.portstatus;
 101                 int             i;
 102                 unsigned        temp;
 103
 104                 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
 105                         temp = ohci_readl(ohci, portstat);
 106                         if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
 107                                         RH_PS_PES)
 108                                 ohci_writel(ohci, RH_PS_PSS, portstat);
 109                 }
 110         }
 111
 112         /* maybe resume can wake root hub */
 113         if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
 114                 ohci->hc_control |= OHCI_CTRL_RWE;
 115         } else {
 116                 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
 117                                 &ohci->regs->intrdisable);
 118                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 119         }
 120
 121         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 122          * which doesn't imply ports will first be individually suspended.
 123          */
 124         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 125         ohci->hc_control |= OHCI_USB_SUSPEND;
 126         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 127         (void) ohci_readl (ohci, &ohci->regs->control);
 128
 129         /* no resumes until devices finish suspending */
 130         if (!autostop) {
 131                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 132                 ohci->autostop = 0;
 133                 ohci->rh_state = OHCI_RH_SUSPENDED;
 134         }
 135
 136 done:
 137         return status;
 138 }
 139
 140 static inline struct ed *find_head (struct ed *ed)
 141 {
 142         /* for bulk and control lists */
 143         while (ed->ed_prev)
 144                 ed = ed->ed_prev;
 145         return ed;
 146 }
 147
 148 /* caller has locked the root hub */
 149 static int ohci_rh_resume (struct ohci_hcd *ohci)
 150 __releases(ohci->lock)
 151 __acquires(ohci->lock)
 152 {
 153         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 154         u32                     temp, enables;
 155         int                     status = -EINPROGRESS;
 156         int                     autostopped = ohci->autostop;
 157
 158         ohci->autostop = 0;
 159         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 160
 161         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 162                 /* this can happen after resuming a swsusp snapshot */
 163                 if (ohci->rh_state != OHCI_RH_RUNNING) {
 164                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 165                                         ohci->hc_control);
 166                         status = -EBUSY;
 167                 /* this happens when pmcore resumes HC then root */
 168                 } else {
 169                         ohci_dbg (ohci, "duplicate resume\n");
 170                         status = 0;
 171                 }
 172         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 173         case OHCI_USB_SUSPEND:
 174                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 175                 ohci->hc_control |= OHCI_USB_RESUME;
 176                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 177                 (void) ohci_readl (ohci, &ohci->regs->control);
 178                 ohci_dbg (ohci, "%s root hub\n",
 179                                 autostopped ? "auto-start" : "resume");
 180                 break;
 181         case OHCI_USB_RESUME:
 182                 /* HCFS changes sometime after INTR_RD */
 183                 ohci_dbg(ohci, "%swakeup root hub\n",
 184                                 autostopped ? "auto-" : "");
 185                 break;
 186         case OHCI_USB_OPER:
 187                 /* this can happen after resuming a swsusp snapshot */
 188                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 189                 status = -EBUSY;
 190                 break;
 191         default:                /* RESET, we lost power */
 192                 ohci_dbg (ohci, "lost power\n");
 193                 status = -EBUSY;
 194         }
 195         if (status == -EBUSY) {
 196                 if (!autostopped) {
 197                         spin_unlock_irq (&ohci->lock);
 198                         status = ohci_restart (ohci);
 199
 200                         usb_root_hub_lost_power(hcd->self.root_hub);
 201
 202                         spin_lock_irq (&ohci->lock);
 203                 }
 204                 return status;
 205         }
 206         if (status != -EINPROGRESS)
 207                 return status;
 208         if (autostopped)
 209                 goto skip_resume;
 210         spin_unlock_irq (&ohci->lock);
 211
 212         /* Some controllers (lucent erratum) need extra-long delays */
 213         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 214
 215         temp = ohci_readl (ohci, &ohci->regs->control);
 216         temp &= OHCI_CTRL_HCFS;
 217         if (temp != OHCI_USB_RESUME) {
 218                 ohci_err (ohci, "controller won't resume\n");
 219                 spin_lock_irq(&ohci->lock);
 220                 return -EBUSY;
 221         }
 222
 223         /* disable old schedule state, reinit from scratch */
 224         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 225         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 226         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 227         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 228         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 229         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 230
 231         /* Sometimes PCI D3 suspend trashes frame timings ... */
 232         periodic_reinit (ohci);
 233
 234         /*
 235          * The following code is executed with ohci->lock held and
 236          * irqs disabled if and only if autostopped is true.  This
 237          * will cause sparse to warn about a "context imbalance".
 238          */
 239 skip_resume:
 240         /* interrupts might have been disabled */
 241         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 242         if (ohci->ed_rm_list)
 243                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 244
 245         /* Then re-enable operations */
 246         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 247         (void) ohci_readl (ohci, &ohci->regs->control);
 248         if (!autostopped)
 249                 msleep (3);
 250
 251         temp = ohci->hc_control;
 252         temp &= OHCI_CTRL_RWC;
 253         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 254         ohci->hc_control = temp;
 255         ohci_writel (ohci, temp, &ohci->regs->control);
 256         (void) ohci_readl (ohci, &ohci->regs->control);
 257
 258         /* TRSMRCY */
 259         if (!autostopped) {
 260                 msleep (10);
 261                 spin_lock_irq (&ohci->lock);
 262         }
 263         /* now ohci->lock is always held and irqs are always disabled */
 264
 265         /* keep it alive for more than ~5x suspend + resume costs */
 266         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 267
 268         /* maybe turn schedules back on */
 269         enables = 0;
 270         temp = 0;
 271         if (!ohci->ed_rm_list) {
 272                 if (ohci->ed_controltail) {
 273                         ohci_writel (ohci,
 274                                         find_head (ohci->ed_controltail)->dma,
 275                                         &ohci->regs->ed_controlhead);
 276                         enables |= OHCI_CTRL_CLE;
 277                         temp |= OHCI_CLF;
 278                 }
 279                 if (ohci->ed_bulktail) {
 280                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 281                                 &ohci->regs->ed_bulkhead);
 282                         enables |= OHCI_CTRL_BLE;
 283                         temp |= OHCI_BLF;
 284                 }
 285         }
 286         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 287                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 288         if (enables) {
 289                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 290                 ohci->hc_control |= enables;
 291                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 292                 if (temp)
 293                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 294                 (void) ohci_readl (ohci, &ohci->regs->control);
 295         }
 296
 297         ohci->rh_state = OHCI_RH_RUNNING;
 298         return 0;
 299 }
 300
 301 static int ohci_bus_suspend (struct usb_hcd *hcd)
 302 {
 303         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 304         int                     rc;
 305
 306         spin_lock_irq (&ohci->lock);
 307
 308         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 309                 rc = -ESHUTDOWN;
 310         else
 311                 rc = ohci_rh_suspend (ohci, 0);
 312         spin_unlock_irq (&ohci->lock);
 313
 314         if (rc == 0)
 315                 del_timer_sync(&ohci->io_watchdog);
 316         return rc;
 317 }
 318
 319 static int ohci_bus_resume (struct usb_hcd *hcd)
 320 {
 321         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 322         int                     rc;
 323
 324         if (time_before (jiffies, ohci->next_statechange))
 325                 msleep(5);
 326
 327         spin_lock_irq (&ohci->lock);
 328
 329         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 330                 rc = -ESHUTDOWN;
 331         else
 332                 rc = ohci_rh_resume (ohci);
 333         spin_unlock_irq (&ohci->lock);
 334
 335         /* poll until we know a device is connected or we autostop */
 336         if (rc == 0)
 337                 usb_hcd_poll_rh_status(hcd);
 338         return rc;
 339 }
 340
 341 /* Carry out polling-, autostop-, and autoresume-related state changes */
 342 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 343                 int any_connected, int rhsc_status)
 344 {
 345         int     poll_rh = 1;
 346         int     rhsc_enable;
 347
 348         /* Some broken controllers never turn off RHSC in the interrupt
 349          * status register.  For their sake we won't re-enable RHSC
 350          * interrupts if the interrupt bit is already active.
 351          */
 352         rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
 353                         OHCI_INTR_RHSC;
 354
 355         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 356         case OHCI_USB_OPER:
 357                 /* If no status changes are pending, enable RHSC interrupts. */
 358                 if (!rhsc_enable && !rhsc_status && !changed) {
 359                         rhsc_enable = OHCI_INTR_RHSC;
 360                         ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
 361                 }
 362
 363                 /* Keep on polling until we know a device is connected
 364                  * and RHSC is enabled, or until we autostop.
 365                  */
 366                 if (!ohci->autostop) {
 367                         if (any_connected ||
 368                                         !device_may_wakeup(&ohci_to_hcd(ohci)
 369                                                 ->self.root_hub->dev)) {
 370                                 if (rhsc_enable)
 371                                         poll_rh = 0;
 372                         } else {
 373                                 ohci->autostop = 1;
 374                                 ohci->next_statechange = jiffies + HZ;
 375                         }
 376
 377                 /* if no devices have been attached for one second, autostop */
 378                 } else {
 379                         if (changed || any_connected) {
 380                                 ohci->autostop = 0;
 381                                 ohci->next_statechange = jiffies +
 382                                                 STATECHANGE_DELAY;
 383                         } else if (time_after_eq(jiffies,
 384                                                 ohci->next_statechange)
 385                                         && !ohci->ed_rm_list
 386                                         && !(ohci->hc_control &
 387                                                 OHCI_SCHED_ENABLES)) {
 388                                 ohci_rh_suspend(ohci, 1);
 389                                 if (rhsc_enable)
 390                                         poll_rh = 0;
 391                         }
 392                 }
 393                 break;
 394
 395         case OHCI_USB_SUSPEND:
 396         case OHCI_USB_RESUME:
 397                 /* if there is a port change, autostart or ask to be resumed */
 398                 if (changed) {
 399                         if (ohci->autostop)
 400                                 ohci_rh_resume(ohci);
 401                         else
 402                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
 403
 404                 /* If remote wakeup is disabled, stop polling */
 405                 } else if (!ohci->autostop &&
 406                                 !ohci_to_hcd(ohci)->self.root_hub->
 407                                         do_remote_wakeup) {
 408                         poll_rh = 0;
 409
 410                 } else {
 411                         /* If no status changes are pending,
 412                          * enable RHSC interrupts
 413                          */
 414                         if (!rhsc_enable && !rhsc_status) {
 415                                 rhsc_enable = OHCI_INTR_RHSC;
 416                                 ohci_writel(ohci, rhsc_enable,
 417                                                 &ohci->regs->intrenable);
 418                         }
 419                         /* Keep polling until RHSC is enabled */
 420                         if (rhsc_enable)
 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, int rhsc_status)
 440 {
 441         /* If RHSC is enabled, don't poll */
 442         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
 443                 return 0;
 444
 445         /* If status changes are pending, continue polling.
 446          * Conversely, if no status changes are pending but the RHSC
 447          * status bit was set, then RHSC may be broken so continue polling.
 448          */
 449         if (changed || rhsc_status)
 450                 return 1;
 451
 452         /* It's safe to re-enable RHSC interrupts */
 453         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
 454         return 0;
 455 }
 456
 457 #endif  /* CONFIG_PM */
 458
 459 /*-------------------------------------------------------------------------*/
 460
 461 /* build "status change" packet (one or two bytes) from HC registers */
 462
 463 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
 464 {
 465         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 466         int             i, changed = 0, length = 1;
 467         int             any_connected = 0;
 468         int             rhsc_status;
 469         unsigned long   flags;
 470
 471         spin_lock_irqsave (&ohci->lock, flags);
 472         if (!HCD_HW_ACCESSIBLE(hcd))
 473                 goto done;
 474
 475         /* undocumented erratum seen on at least rev D */
 476         if ((ohci->flags & OHCI_QUIRK_AMD756)
 477                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 478                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 479                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 480                 /* retry later; "should not happen" */
 481                 goto done;
 482         }
 483
 484         /* init status */
 485         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 486                 buf [0] = changed = 1;
 487         else
 488                 buf [0] = 0;
 489         if (ohci->num_ports > 7) {
 490                 buf [1] = 0;
 491                 length++;
 492         }
 493
 494         /* Clear the RHSC status flag before reading the port statuses */
 495         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
 496         rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
 497                         OHCI_INTR_RHSC;
 498
 499         /* look at each port */
 500         for (i = 0; i < ohci->num_ports; i++) {
 501                 u32     status = roothub_portstatus (ohci, i);
 502
 503                 /* can't autostop if ports are connected */
 504                 any_connected |= (status & RH_PS_CCS);
 505
 506                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 507                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 508                         changed = 1;
 509                         if (i < 7)
 510                             buf [0] |= 1 << (i + 1);
 511                         else
 512                             buf [1] |= 1 << (i - 7);
 513                 }
 514         }
 515
 516         if (ohci_root_hub_state_changes(ohci, changed,
 517                         any_connected, rhsc_status))
 518                 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 519         else
 520                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 521
 522
 523 done:
 524         spin_unlock_irqrestore (&ohci->lock, flags);
 525
 526         return changed ? length : 0;
 527 }
 528 EXPORT_SYMBOL_GPL(ohci_hub_status_data);
 529
 530 /*-------------------------------------------------------------------------*/
 531
 532 static void
 533 ohci_hub_descriptor (
 534         struct ohci_hcd                 *ohci,
 535         struct usb_hub_descriptor       *desc
 536 ) {
 537         u32             rh = roothub_a (ohci);
 538         u16             temp;
 539
 540         desc->bDescriptorType = USB_DT_HUB;
 541         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 542         desc->bHubContrCurrent = 0;
 543
 544         desc->bNbrPorts = ohci->num_ports;
 545         temp = 1 + (ohci->num_ports / 8);
 546         desc->bDescLength = 7 + 2 * temp;
 547
 548         temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM;
 549         if (rh & RH_A_NPS)              /* no power switching? */
 550                 temp |= HUB_CHAR_NO_LPSM;
 551         if (rh & RH_A_PSM)              /* per-port power switching? */
 552                 temp |= HUB_CHAR_INDV_PORT_LPSM;
 553         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 554                 temp |= HUB_CHAR_NO_OCPM;
 555         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 556                 temp |= HUB_CHAR_INDV_PORT_OCPM;
 557         desc->wHubCharacteristics = cpu_to_le16(temp);
 558
 559         /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 560         rh = roothub_b (ohci);
 561         memset(desc->u.hs.DeviceRemovable, 0xff,
 562                         sizeof(desc->u.hs.DeviceRemovable));
 563         desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
 564         if (ohci->num_ports > 7) {
 565                 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
 566                 desc->u.hs.DeviceRemovable[2] = 0xff;
 567         } else
 568                 desc->u.hs.DeviceRemovable[1] = 0xff;
 569 }
 570
 571 /*-------------------------------------------------------------------------*/
 572
 573 #ifdef  CONFIG_USB_OTG
 574
 575 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 576 {
 577         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 578         u32                     status;
 579
 580         if (!port)
 581                 return -EINVAL;
 582         port--;
 583
 584         /* start port reset before HNP protocol times out */
 585         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 586         if (!(status & RH_PS_CCS))
 587                 return -ENODEV;
 588
 589         /* hub_wq will finish the reset later */
 590         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 591         return 0;
 592 }
 593
 594 #else
 595
 596 #define ohci_start_port_reset           NULL
 597
 598 #endif
 599
 600 /*-------------------------------------------------------------------------*/
 601
 602
 603 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 604  * not necessarily continuous ... to guard against resume signaling.
 605  */
 606 #define PORT_RESET_MSEC         50
 607
 608 /* this timer value might be vendor-specific ... */
 609 #define PORT_RESET_HW_MSEC      10
 610
 611 /* wrap-aware logic morphed from <linux/jiffies.h> */
 612 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 613
 614 /* called from some task, normally hub_wq */
 615 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
 616 {
 617         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 618         u32     temp = 0;
 619         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 620         u16     reset_done = now + PORT_RESET_MSEC;
 621         int     limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
 622
 623         /* build a "continuous enough" reset signal, with up to
 624          * 3msec gap between pulses.  scheduler HZ==100 must work;
 625          * this might need to be deadline-scheduled.
 626          */
 627         do {
 628                 int limit_2;
 629
 630                 /* spin until any current reset finishes */
 631                 limit_2 = PORT_RESET_HW_MSEC * 2;
 632                 while (--limit_2 >= 0) {
 633                         temp = ohci_readl (ohci, portstat);
 634                         /* handle e.g. CardBus eject */
 635                         if (temp == ~(u32)0)
 636                                 return -ESHUTDOWN;
 637                         if (!(temp & RH_PS_PRS))
 638                                 break;
 639                         udelay (500);
 640                 }
 641
 642                 /* timeout (a hardware error) has been observed when
 643                  * EHCI sets CF while this driver is resetting a port;
 644                  * presumably other disconnect paths might do it too.
 645                  */
 646                 if (limit_2 < 0) {
 647                         ohci_dbg(ohci,
 648                                 "port[%d] reset timeout, stat %08x\n",
 649                                 port, temp);
 650                         break;
 651                 }
 652
 653                 if (!(temp & RH_PS_CCS))
 654                         break;
 655                 if (temp & RH_PS_PRSC)
 656                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 657
 658                 /* start the next reset, sleep till it's probably done */
 659                 ohci_writel (ohci, RH_PS_PRS, portstat);
 660                 msleep(PORT_RESET_HW_MSEC);
 661                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 662         } while (tick_before(now, reset_done) && --limit_1 >= 0);
 663
 664         /* caller synchronizes using PRSC ... and handles PRS
 665          * still being set when this returns.
 666          */
 667
 668         return 0;
 669 }
 670
 671 int ohci_hub_control(
 672         struct usb_hcd  *hcd,
 673         u16             typeReq,
 674         u16             wValue,
 675         u16             wIndex,
 676         char            *buf,
 677         u16             wLength
 678 ) {
 679         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 680         int             ports = ohci->num_ports;
 681         u32             temp;
 682         int             retval = 0;
 683
 684         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 685                 return -ESHUTDOWN;
 686
 687         switch (typeReq) {
 688         case ClearHubFeature:
 689                 switch (wValue) {
 690                 case C_HUB_OVER_CURRENT:
 691                         ohci_writel (ohci, RH_HS_OCIC,
 692                                         &ohci->regs->roothub.status);
 693                 case C_HUB_LOCAL_POWER:
 694                         break;
 695                 default:
 696                         goto error;
 697                 }
 698                 break;
 699         case ClearPortFeature:
 700                 if (!wIndex || wIndex > ports)
 701                         goto error;
 702                 wIndex--;
 703
 704                 switch (wValue) {
 705                 case USB_PORT_FEAT_ENABLE:
 706                         temp = RH_PS_CCS;
 707                         break;
 708                 case USB_PORT_FEAT_C_ENABLE:
 709                         temp = RH_PS_PESC;
 710                         break;
 711                 case USB_PORT_FEAT_SUSPEND:
 712                         temp = RH_PS_POCI;
 713                         break;
 714                 case USB_PORT_FEAT_C_SUSPEND:
 715                         temp = RH_PS_PSSC;
 716                         break;
 717                 case USB_PORT_FEAT_POWER:
 718                         temp = RH_PS_LSDA;
 719                         break;
 720                 case USB_PORT_FEAT_C_CONNECTION:
 721                         temp = RH_PS_CSC;
 722                         break;
 723                 case USB_PORT_FEAT_C_OVER_CURRENT:
 724                         temp = RH_PS_OCIC;
 725                         break;
 726                 case USB_PORT_FEAT_C_RESET:
 727                         temp = RH_PS_PRSC;
 728                         break;
 729                 default:
 730                         goto error;
 731                 }
 732                 ohci_writel (ohci, temp,
 733                                 &ohci->regs->roothub.portstatus [wIndex]);
 734                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 735                 break;
 736         case GetHubDescriptor:
 737                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 738                 break;
 739         case GetHubStatus:
 740                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 741                 put_unaligned_le32(temp, buf);
 742                 break;
 743         case GetPortStatus:
 744                 if (!wIndex || wIndex > ports)
 745                         goto error;
 746                 wIndex--;
 747                 temp = roothub_portstatus (ohci, wIndex);
 748                 put_unaligned_le32(temp, buf);
 749
 750                 if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 751                         dbg_port(ohci, "GetStatus", wIndex, temp);
 752                 break;
 753         case SetHubFeature:
 754                 switch (wValue) {
 755                 case C_HUB_OVER_CURRENT:
 756                         // FIXME:  this can be cleared, yes?
 757                 case C_HUB_LOCAL_POWER:
 758                         break;
 759                 default:
 760                         goto error;
 761                 }
 762                 break;
 763         case SetPortFeature:
 764                 if (!wIndex || wIndex > ports)
 765                         goto error;
 766                 wIndex--;
 767                 switch (wValue) {
 768                 case USB_PORT_FEAT_SUSPEND:
 769 #ifdef  CONFIG_USB_OTG
 770                         if (hcd->self.otg_port == (wIndex + 1)
 771                                         && hcd->self.b_hnp_enable)
 772                                 ohci->start_hnp(ohci);
 773                         else
 774 #endif
 775                         ohci_writel (ohci, RH_PS_PSS,
 776                                 &ohci->regs->roothub.portstatus [wIndex]);
 777                         break;
 778                 case USB_PORT_FEAT_POWER:
 779                         ohci_writel (ohci, RH_PS_PPS,
 780                                 &ohci->regs->roothub.portstatus [wIndex]);
 781                         break;
 782                 case USB_PORT_FEAT_RESET:
 783                         retval = root_port_reset (ohci, wIndex);
 784                         break;
 785                 default:
 786                         goto error;
 787                 }
 788                 break;
 789
 790         default:
 791 error:
 792                 /* "protocol stall" on error */
 793                 retval = -EPIPE;
 794         }
 795         return retval;
 796 }
 797 EXPORT_SYMBOL_GPL(ohci_hub_control);