drivers/usb/host/ohci-hub.c

   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 update_done_list(struct ohci_hcd *);
  43 static void ohci_work(struct ohci_hcd *);
  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         update_done_list(ohci);
  91         ohci_work(ohci);
  92
  93         /*
  94          * Some controllers don't handle "global" suspend properly if
  95          * there are unsuspended ports.  For these controllers, put all
  96          * the enabled ports into suspend before suspending the root hub.
  97          */
  98         if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
  99                 __hc32 __iomem  *portstat = ohci->regs->roothub.portstatus;
 100                 int             i;
 101                 unsigned        temp;
 102
 103                 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
 104                         temp = ohci_readl(ohci, portstat);
 105                         if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
 106                                         RH_PS_PES)
 107                                 ohci_writel(ohci, RH_PS_PSS, portstat);
 108                 }
 109         }
 110
 111         /* maybe resume can wake root hub */
 112         if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
 113                 ohci->hc_control |= OHCI_CTRL_RWE;
 114         } else {
 115                 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
 116                                 &ohci->regs->intrdisable);
 117                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 118         }
 119
 120         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 121          * which doesn't imply ports will first be individually suspended.
 122          */
 123         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 124         ohci->hc_control |= OHCI_USB_SUSPEND;
 125         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 126         (void) ohci_readl (ohci, &ohci->regs->control);
 127
 128         /* no resumes until devices finish suspending */
 129         if (!autostop) {
 130                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 131                 ohci->autostop = 0;
 132                 ohci->rh_state = OHCI_RH_SUSPENDED;
 133         }
 134
 135 done:
 136         return status;
 137 }
 138
 139 static inline struct ed *find_head (struct ed *ed)
 140 {
 141         /* for bulk and control lists */
 142         while (ed->ed_prev)
 143                 ed = ed->ed_prev;
 144         return ed;
 145 }
 146
 147 /* caller has locked the root hub */
 148 static int ohci_rh_resume (struct ohci_hcd *ohci)
 149 __releases(ohci->lock)
 150 __acquires(ohci->lock)
 151 {
 152         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 153         u32                     temp, enables;
 154         int                     status = -EINPROGRESS;
 155         int                     autostopped = ohci->autostop;
 156
 157         ohci->autostop = 0;
 158         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 159
 160         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 161                 /* this can happen after resuming a swsusp snapshot */
 162                 if (ohci->rh_state != OHCI_RH_RUNNING) {
 163                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 164                                         ohci->hc_control);
 165                         status = -EBUSY;
 166                 /* this happens when pmcore resumes HC then root */
 167                 } else {
 168                         ohci_dbg (ohci, "duplicate resume\n");
 169                         status = 0;
 170                 }
 171         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 172         case OHCI_USB_SUSPEND:
 173                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 174                 ohci->hc_control |= OHCI_USB_RESUME;
 175                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 176                 (void) ohci_readl (ohci, &ohci->regs->control);
 177                 ohci_dbg (ohci, "%s root hub\n",
 178                                 autostopped ? "auto-start" : "resume");
 179                 break;
 180         case OHCI_USB_RESUME:
 181                 /* HCFS changes sometime after INTR_RD */
 182                 ohci_dbg(ohci, "%swakeup root hub\n",
 183                                 autostopped ? "auto-" : "");
 184                 break;
 185         case OHCI_USB_OPER:
 186                 /* this can happen after resuming a swsusp snapshot */
 187                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 188                 status = -EBUSY;
 189                 break;
 190         default:                /* RESET, we lost power */
 191                 ohci_dbg (ohci, "lost power\n");
 192                 status = -EBUSY;
 193         }
 194         if (status == -EBUSY) {
 195                 if (!autostopped) {
 196                         spin_unlock_irq (&ohci->lock);
 197                         status = ohci_restart (ohci);
 198
 199                         usb_root_hub_lost_power(hcd->self.root_hub);
 200
 201                         spin_lock_irq (&ohci->lock);
 202                 }
 203                 return status;
 204         }
 205         if (status != -EINPROGRESS)
 206                 return status;
 207         if (autostopped)
 208                 goto skip_resume;
 209         spin_unlock_irq (&ohci->lock);
 210
 211         /* Some controllers (lucent erratum) need extra-long delays */
 212         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 213
 214         temp = ohci_readl (ohci, &ohci->regs->control);
 215         temp &= OHCI_CTRL_HCFS;
 216         if (temp != OHCI_USB_RESUME) {
 217                 ohci_err (ohci, "controller won't resume\n");
 218                 spin_lock_irq(&ohci->lock);
 219                 return -EBUSY;
 220         }
 221
 222         /* disable old schedule state, reinit from scratch */
 223         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 224         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 225         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 226         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 227         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 228         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 229
 230         /* Sometimes PCI D3 suspend trashes frame timings ... */
 231         periodic_reinit (ohci);
 232
 233         /*
 234          * The following code is executed with ohci->lock held and
 235          * irqs disabled if and only if autostopped is true.  This
 236          * will cause sparse to warn about a "context imbalance".
 237          */
 238 skip_resume:
 239         /* interrupts might have been disabled */
 240         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 241         if (ohci->ed_rm_list)
 242                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 243
 244         /* Then re-enable operations */
 245         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 246         (void) ohci_readl (ohci, &ohci->regs->control);
 247         if (!autostopped)
 248                 msleep (3);
 249
 250         temp = ohci->hc_control;
 251         temp &= OHCI_CTRL_RWC;
 252         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 253         ohci->hc_control = temp;
 254         ohci_writel (ohci, temp, &ohci->regs->control);
 255         (void) ohci_readl (ohci, &ohci->regs->control);
 256
 257         /* TRSMRCY */
 258         if (!autostopped) {
 259                 msleep (10);
 260                 spin_lock_irq (&ohci->lock);
 261         }
 262         /* now ohci->lock is always held and irqs are always disabled */
 263
 264         /* keep it alive for more than ~5x suspend + resume costs */
 265         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 266
 267         /* maybe turn schedules back on */
 268         enables = 0;
 269         temp = 0;
 270         if (!ohci->ed_rm_list) {
 271                 if (ohci->ed_controltail) {
 272                         ohci_writel (ohci,
 273                                         find_head (ohci->ed_controltail)->dma,
 274                                         &ohci->regs->ed_controlhead);
 275                         enables |= OHCI_CTRL_CLE;
 276                         temp |= OHCI_CLF;
 277                 }
 278                 if (ohci->ed_bulktail) {
 279                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 280                                 &ohci->regs->ed_bulkhead);
 281                         enables |= OHCI_CTRL_BLE;
 282                         temp |= OHCI_BLF;
 283                 }
 284         }
 285         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 286                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 287         if (enables) {
 288                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 289                 ohci->hc_control |= enables;
 290                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 291                 if (temp)
 292                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 293                 (void) ohci_readl (ohci, &ohci->regs->control);
 294         }
 295
 296         ohci->rh_state = OHCI_RH_RUNNING;
 297         return 0;
 298 }
 299
 300 static int ohci_bus_suspend (struct usb_hcd *hcd)
 301 {
 302         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 303         int                     rc;
 304
 305         spin_lock_irq (&ohci->lock);
 306
 307         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 308                 rc = -ESHUTDOWN;
 309         else
 310                 rc = ohci_rh_suspend (ohci, 0);
 311         spin_unlock_irq (&ohci->lock);
 312
 313         if (rc == 0)
 314                 del_timer_sync(&ohci->io_watchdog);
 315         return rc;
 316 }
 317
 318 static int ohci_bus_resume (struct usb_hcd *hcd)
 319 {
 320         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 321         int                     rc;
 322
 323         if (time_before (jiffies, ohci->next_statechange))
 324                 msleep(5);
 325
 326         spin_lock_irq (&ohci->lock);
 327
 328         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 329                 rc = -ESHUTDOWN;
 330         else
 331                 rc = ohci_rh_resume (ohci);
 332         spin_unlock_irq (&ohci->lock);
 333
 334         /* poll until we know a device is connected or we autostop */
 335         if (rc == 0)
 336                 usb_hcd_poll_rh_status(hcd);
 337         return rc;
 338 }
 339
 340 /* Carry out polling-, autostop-, and autoresume-related state changes */
 341 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 342                 int any_connected, int rhsc_status)
 343 {
 344         int     poll_rh = 1;
 345         int     rhsc_enable;
 346
 347         /* Some broken controllers never turn off RHSC in the interrupt
 348          * status register.  For their sake we won't re-enable RHSC
 349          * interrupts if the interrupt bit is already active.
 350          */
 351         rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
 352                         OHCI_INTR_RHSC;
 353
 354         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 355         case OHCI_USB_OPER:
 356                 /* If no status changes are pending, enable RHSC interrupts. */
 357                 if (!rhsc_enable && !rhsc_status && !changed) {
 358                         rhsc_enable = OHCI_INTR_RHSC;
 359                         ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
 360                 }
 361
 362                 /* Keep on polling until we know a device is connected
 363                  * and RHSC is enabled, or until we autostop.
 364                  */
 365                 if (!ohci->autostop) {
 366                         if (any_connected ||
 367                                         !device_may_wakeup(&ohci_to_hcd(ohci)
 368                                                 ->self.root_hub->dev)) {
 369                                 if (rhsc_enable)
 370                                         poll_rh = 0;
 371                         } else {
 372                                 ohci->autostop = 1;
 373                                 ohci->next_statechange = jiffies + HZ;
 374                         }
 375
 376                 /* if no devices have been attached for one second, autostop */
 377                 } else {
 378                         if (changed || any_connected) {
 379                                 ohci->autostop = 0;
 380                                 ohci->next_statechange = jiffies +
 381                                                 STATECHANGE_DELAY;
 382                         } else if (time_after_eq(jiffies,
 383                                                 ohci->next_statechange)
 384                                         && !ohci->ed_rm_list
 385                                         && !(ohci->hc_control &
 386                                                 OHCI_SCHED_ENABLES)) {
 387                                 ohci_rh_suspend(ohci, 1);
 388                                 if (rhsc_enable)
 389                                         poll_rh = 0;
 390                         }
 391                 }
 392                 break;
 393
 394         case OHCI_USB_SUSPEND:
 395         case OHCI_USB_RESUME:
 396                 /* if there is a port change, autostart or ask to be resumed */
 397                 if (changed) {
 398                         if (ohci->autostop)
 399                                 ohci_rh_resume(ohci);
 400                         else
 401                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
 402
 403                 /* If remote wakeup is disabled, stop polling */
 404                 } else if (!ohci->autostop &&
 405                                 !ohci_to_hcd(ohci)->self.root_hub->
 406                                         do_remote_wakeup) {
 407                         poll_rh = 0;
 408
 409                 } else {
 410                         /* If no status changes are pending,
 411                          * enable RHSC interrupts
 412                          */
 413                         if (!rhsc_enable && !rhsc_status) {
 414                                 rhsc_enable = OHCI_INTR_RHSC;
 415                                 ohci_writel(ohci, rhsc_enable,
 416                                                 &ohci->regs->intrenable);
 417                         }
 418                         /* Keep polling until RHSC is enabled */
 419                         if (rhsc_enable)
 420                                 poll_rh = 0;
 421                 }
 422                 break;
 423         }
 424         return poll_rh;
 425 }
 426
 427 #else   /* CONFIG_PM */
 428
 429 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
 430 {
 431         return 0;
 432 }
 433
 434 /* Carry out polling-related state changes.
 435  * autostop isn't used when CONFIG_PM is turned off.
 436  */
 437 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 438                 int any_connected, int rhsc_status)
 439 {
 440         /* If RHSC is enabled, don't poll */
 441         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
 442                 return 0;
 443
 444         /* If status changes are pending, continue polling.
 445          * Conversely, if no status changes are pending but the RHSC
 446          * status bit was set, then RHSC may be broken so continue polling.
 447          */
 448         if (changed || rhsc_status)
 449                 return 1;
 450
 451         /* It's safe to re-enable RHSC interrupts */
 452         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
 453         return 0;
 454 }
 455
 456 #endif  /* CONFIG_PM */
 457
 458 /*-------------------------------------------------------------------------*/
 459
 460 /* build "status change" packet (one or two bytes) from HC registers */
 461
 462 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
 463 {
 464         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 465         int             i, changed = 0, length = 1;
 466         int             any_connected = 0;
 467         int             rhsc_status;
 468         unsigned long   flags;
 469
 470         spin_lock_irqsave (&ohci->lock, flags);
 471         if (!HCD_HW_ACCESSIBLE(hcd))
 472                 goto done;
 473
 474         /* undocumented erratum seen on at least rev D */
 475         if ((ohci->flags & OHCI_QUIRK_AMD756)
 476                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 477                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 478                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 479                 /* retry later; "should not happen" */
 480                 goto done;
 481         }
 482
 483         /* init status */
 484         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 485                 buf [0] = changed = 1;
 486         else
 487                 buf [0] = 0;
 488         if (ohci->num_ports > 7) {
 489                 buf [1] = 0;
 490                 length++;
 491         }
 492
 493         /* Clear the RHSC status flag before reading the port statuses */
 494         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
 495         rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
 496                         OHCI_INTR_RHSC;
 497
 498         /* look at each port */
 499         for (i = 0; i < ohci->num_ports; i++) {
 500                 u32     status = roothub_portstatus (ohci, i);
 501
 502                 /* can't autostop if ports are connected */
 503                 any_connected |= (status & RH_PS_CCS);
 504
 505                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 506                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 507                         changed = 1;
 508                         if (i < 7)
 509                             buf [0] |= 1 << (i + 1);
 510                         else
 511                             buf [1] |= 1 << (i - 7);
 512                 }
 513         }
 514
 515         if (ohci_root_hub_state_changes(ohci, changed,
 516                         any_connected, rhsc_status))
 517                 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 518         else
 519                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 520
 521
 522 done:
 523         spin_unlock_irqrestore (&ohci->lock, flags);
 524
 525         return changed ? length : 0;
 526 }
 527 EXPORT_SYMBOL_GPL(ohci_hub_status_data);
 528
 529 /*-------------------------------------------------------------------------*/
 530
 531 static void
 532 ohci_hub_descriptor (
 533         struct ohci_hcd                 *ohci,
 534         struct usb_hub_descriptor       *desc
 535 ) {
 536         u32             rh = roothub_a (ohci);
 537         u16             temp;
 538
 539         desc->bDescriptorType = 0x29;
 540         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 541         desc->bHubContrCurrent = 0;
 542
 543         desc->bNbrPorts = ohci->num_ports;
 544         temp = 1 + (ohci->num_ports / 8);
 545         desc->bDescLength = 7 + 2 * temp;
 546
 547         temp = 0;
 548         if (rh & RH_A_NPS)              /* no power switching? */
 549             temp |= 0x0002;
 550         if (rh & RH_A_PSM)              /* per-port power switching? */
 551             temp |= 0x0001;
 552         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 553             temp |= 0x0010;
 554         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 555             temp |= 0x0008;
 556         desc->wHubCharacteristics = cpu_to_le16(temp);
 557
 558         /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 559         rh = roothub_b (ohci);
 560         memset(desc->u.hs.DeviceRemovable, 0xff,
 561                         sizeof(desc->u.hs.DeviceRemovable));
 562         desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
 563         if (ohci->num_ports > 7) {
 564                 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
 565                 desc->u.hs.DeviceRemovable[2] = 0xff;
 566         } else
 567                 desc->u.hs.DeviceRemovable[1] = 0xff;
 568 }
 569
 570 /*-------------------------------------------------------------------------*/
 571
 572 #ifdef  CONFIG_USB_OTG
 573
 574 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 575 {
 576         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 577         u32                     status;
 578
 579         if (!port)
 580                 return -EINVAL;
 581         port--;
 582
 583         /* start port reset before HNP protocol times out */
 584         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 585         if (!(status & RH_PS_CCS))
 586                 return -ENODEV;
 587
 588         /* khubd will finish the reset later */
 589         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 590         return 0;
 591 }
 592
 593 #else
 594
 595 #define ohci_start_port_reset           NULL
 596
 597 #endif
 598
 599 /*-------------------------------------------------------------------------*/
 600
 601
 602 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 603  * not necessarily continuous ... to guard against resume signaling.
 604  */
 605 #define PORT_RESET_MSEC         50
 606
 607 /* this timer value might be vendor-specific ... */
 608 #define PORT_RESET_HW_MSEC      10
 609
 610 /* wrap-aware logic morphed from <linux/jiffies.h> */
 611 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 612
 613 /* called from some task, normally khubd */
 614 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
 615 {
 616         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 617         u32     temp = 0;
 618         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 619         u16     reset_done = now + PORT_RESET_MSEC;
 620         int     limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
 621
 622         /* build a "continuous enough" reset signal, with up to
 623          * 3msec gap between pulses.  scheduler HZ==100 must work;
 624          * this might need to be deadline-scheduled.
 625          */
 626         do {
 627                 int limit_2;
 628
 629                 /* spin until any current reset finishes */
 630                 limit_2 = PORT_RESET_HW_MSEC * 2;
 631                 while (--limit_2 >= 0) {
 632                         temp = ohci_readl (ohci, portstat);
 633                         /* handle e.g. CardBus eject */
 634                         if (temp == ~(u32)0)
 635                                 return -ESHUTDOWN;
 636                         if (!(temp & RH_PS_PRS))
 637                                 break;
 638                         udelay (500);
 639                 }
 640
 641                 /* timeout (a hardware error) has been observed when
 642                  * EHCI sets CF while this driver is resetting a port;
 643                  * presumably other disconnect paths might do it too.
 644                  */
 645                 if (limit_2 < 0) {
 646                         ohci_dbg(ohci,
 647                                 "port[%d] reset timeout, stat %08x\n",
 648                                 port, temp);
 649                         break;
 650                 }
 651
 652                 if (!(temp & RH_PS_CCS))
 653                         break;
 654                 if (temp & RH_PS_PRSC)
 655                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 656
 657                 /* start the next reset, sleep till it's probably done */
 658                 ohci_writel (ohci, RH_PS_PRS, portstat);
 659                 msleep(PORT_RESET_HW_MSEC);
 660                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 661         } while (tick_before(now, reset_done) && --limit_1 >= 0);
 662
 663         /* caller synchronizes using PRSC ... and handles PRS
 664          * still being set when this returns.
 665          */
 666
 667         return 0;
 668 }
 669
 670 int ohci_hub_control(
 671         struct usb_hcd  *hcd,
 672         u16             typeReq,
 673         u16             wValue,
 674         u16             wIndex,
 675         char            *buf,
 676         u16             wLength
 677 ) {
 678         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 679         int             ports = ohci->num_ports;
 680         u32             temp;
 681         int             retval = 0;
 682
 683         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 684                 return -ESHUTDOWN;
 685
 686         switch (typeReq) {
 687         case ClearHubFeature:
 688                 switch (wValue) {
 689                 case C_HUB_OVER_CURRENT:
 690                         ohci_writel (ohci, RH_HS_OCIC,
 691                                         &ohci->regs->roothub.status);
 692                 case C_HUB_LOCAL_POWER:
 693                         break;
 694                 default:
 695                         goto error;
 696                 }
 697                 break;
 698         case ClearPortFeature:
 699                 if (!wIndex || wIndex > ports)
 700                         goto error;
 701                 wIndex--;
 702
 703                 switch (wValue) {
 704                 case USB_PORT_FEAT_ENABLE:
 705                         temp = RH_PS_CCS;
 706                         break;
 707                 case USB_PORT_FEAT_C_ENABLE:
 708                         temp = RH_PS_PESC;
 709                         break;
 710                 case USB_PORT_FEAT_SUSPEND:
 711                         temp = RH_PS_POCI;
 712                         break;
 713                 case USB_PORT_FEAT_C_SUSPEND:
 714                         temp = RH_PS_PSSC;
 715                         break;
 716                 case USB_PORT_FEAT_POWER:
 717                         temp = RH_PS_LSDA;
 718                         break;
 719                 case USB_PORT_FEAT_C_CONNECTION:
 720                         temp = RH_PS_CSC;
 721                         break;
 722                 case USB_PORT_FEAT_C_OVER_CURRENT:
 723                         temp = RH_PS_OCIC;
 724                         break;
 725                 case USB_PORT_FEAT_C_RESET:
 726                         temp = RH_PS_PRSC;
 727                         break;
 728                 default:
 729                         goto error;
 730                 }
 731                 ohci_writel (ohci, temp,
 732                                 &ohci->regs->roothub.portstatus [wIndex]);
 733                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 734                 break;
 735         case GetHubDescriptor:
 736                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 737                 break;
 738         case GetHubStatus:
 739                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 740                 put_unaligned_le32(temp, buf);
 741                 break;
 742         case GetPortStatus:
 743                 if (!wIndex || wIndex > ports)
 744                         goto error;
 745                 wIndex--;
 746                 temp = roothub_portstatus (ohci, wIndex);
 747                 put_unaligned_le32(temp, buf);
 748
 749                 if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 750                         dbg_port(ohci, "GetStatus", wIndex, temp);
 751                 break;
 752         case SetHubFeature:
 753                 switch (wValue) {
 754                 case C_HUB_OVER_CURRENT:
 755                         // FIXME:  this can be cleared, yes?
 756                 case C_HUB_LOCAL_POWER:
 757                         break;
 758                 default:
 759                         goto error;
 760                 }
 761                 break;
 762         case SetPortFeature:
 763                 if (!wIndex || wIndex > ports)
 764                         goto error;
 765                 wIndex--;
 766                 switch (wValue) {
 767                 case USB_PORT_FEAT_SUSPEND:
 768 #ifdef  CONFIG_USB_OTG
 769                         if (hcd->self.otg_port == (wIndex + 1)
 770                                         && hcd->self.b_hnp_enable)
 771                                 ohci->start_hnp(ohci);
 772                         else
 773 #endif
 774                         ohci_writel (ohci, RH_PS_PSS,
 775                                 &ohci->regs->roothub.portstatus [wIndex]);
 776                         break;
 777                 case USB_PORT_FEAT_POWER:
 778                         ohci_writel (ohci, RH_PS_PPS,
 779                                 &ohci->regs->roothub.portstatus [wIndex]);
 780                         break;
 781                 case USB_PORT_FEAT_RESET:
 782                         retval = root_port_reset (ohci, wIndex);
 783                         break;
 784                 default:
 785                         goto error;
 786                 }
 787                 break;
 788
 789         default:
 790 error:
 791                 /* "protocol stall" on error */
 792                 retval = -EPIPE;
 793         }
 794         return retval;
 795 }
 796 EXPORT_SYMBOL_GPL(ohci_hub_control);