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 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         }
 115
 116 done:
 117         return status;
 118 }
 119
 120 static inline struct ed *find_head (struct ed *ed)
 121 {
 122         /* for bulk and control lists */
 123         while (ed->ed_prev)
 124                 ed = ed->ed_prev;
 125         return ed;
 126 }
 127
 128 /* caller has locked the root hub */
 129 static int ohci_rh_resume (struct ohci_hcd *ohci)
 130 __releases(ohci->lock)
 131 __acquires(ohci->lock)
 132 {
 133         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 134         u32                     temp, enables;
 135         int                     status = -EINPROGRESS;
 136         int                     autostopped = ohci->autostop;
 137
 138         ohci->autostop = 0;
 139         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 140
 141         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 142                 /* this can happen after resuming a swsusp snapshot */
 143                 if (hcd->state == HC_STATE_RESUMING) {
 144                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 145                                         ohci->hc_control);
 146                         status = -EBUSY;
 147                 /* this happens when pmcore resumes HC then root */
 148                 } else {
 149                         ohci_dbg (ohci, "duplicate resume\n");
 150                         status = 0;
 151                 }
 152         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 153         case OHCI_USB_SUSPEND:
 154                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 155                 ohci->hc_control |= OHCI_USB_RESUME;
 156                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 157                 (void) ohci_readl (ohci, &ohci->regs->control);
 158                 ohci_dbg (ohci, "%s root hub\n",
 159                                 autostopped ? "auto-start" : "resume");
 160                 break;
 161         case OHCI_USB_RESUME:
 162                 /* HCFS changes sometime after INTR_RD */
 163                 ohci_dbg(ohci, "%swakeup root hub\n",
 164                                 autostopped ? "auto-" : "");
 165                 break;
 166         case OHCI_USB_OPER:
 167                 /* this can happen after resuming a swsusp snapshot */
 168                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 169                 status = -EBUSY;
 170                 break;
 171         default:                /* RESET, we lost power */
 172                 ohci_dbg (ohci, "lost power\n");
 173                 status = -EBUSY;
 174         }
 175         if (status == -EBUSY) {
 176                 if (!autostopped) {
 177                         spin_unlock_irq (&ohci->lock);
 178                         (void) ohci_init (ohci);
 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         return 0;
 278 }
 279
 280 static int ohci_bus_suspend (struct usb_hcd *hcd)
 281 {
 282         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 283         int                     rc;
 284
 285         spin_lock_irq (&ohci->lock);
 286
 287         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 288                 rc = -ESHUTDOWN;
 289         else
 290                 rc = ohci_rh_suspend (ohci, 0);
 291         spin_unlock_irq (&ohci->lock);
 292         return rc;
 293 }
 294
 295 static int ohci_bus_resume (struct usb_hcd *hcd)
 296 {
 297         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 298         int                     rc;
 299
 300         if (time_before (jiffies, ohci->next_statechange))
 301                 msleep(5);
 302
 303         spin_lock_irq (&ohci->lock);
 304
 305         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 306                 rc = -ESHUTDOWN;
 307         else
 308                 rc = ohci_rh_resume (ohci);
 309         spin_unlock_irq (&ohci->lock);
 310
 311         /* poll until we know a device is connected or we autostop */
 312         if (rc == 0)
 313                 usb_hcd_poll_rh_status(hcd);
 314         return rc;
 315 }
 316
 317 /* Carry out the final steps of resuming the controller device */
 318 static void ohci_finish_controller_resume(struct usb_hcd *hcd)
 319 {
 320         struct ohci_hcd         *ohci = hcd_to_ohci(hcd);
 321         int                     port;
 322         bool                    need_reinit = false;
 323
 324         /* See if the controller is already running or has been reset */
 325         ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
 326         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 327                 need_reinit = true;
 328         } else {
 329                 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 330                 case OHCI_USB_OPER:
 331                 case OHCI_USB_RESET:
 332                         need_reinit = true;
 333                 }
 334         }
 335
 336         /* If needed, reinitialize and suspend the root hub */
 337         if (need_reinit) {
 338                 spin_lock_irq(&ohci->lock);
 339                 hcd->state = HC_STATE_RESUMING;
 340                 ohci_rh_resume(ohci);
 341                 hcd->state = HC_STATE_QUIESCING;
 342                 ohci_rh_suspend(ohci, 0);
 343                 hcd->state = HC_STATE_SUSPENDED;
 344                 spin_unlock_irq(&ohci->lock);
 345         }
 346
 347         /* Normally just turn on port power and enable interrupts */
 348         else {
 349                 ohci_dbg(ohci, "powerup ports\n");
 350                 for (port = 0; port < ohci->num_ports; port++)
 351                         ohci_writel(ohci, RH_PS_PPS,
 352                                         &ohci->regs->roothub.portstatus[port]);
 353
 354                 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
 355                 ohci_readl(ohci, &ohci->regs->intrenable);
 356                 msleep(20);
 357         }
 358 }
 359
 360 /* Carry out polling-, autostop-, and autoresume-related state changes */
 361 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 362                 int any_connected)
 363 {
 364         int     poll_rh = 1;
 365         int     rhsc;
 366
 367         rhsc = ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC;
 368         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 369
 370         case OHCI_USB_OPER:
 371                 /* If no status changes are pending, enable status-change
 372                  * interrupts.
 373                  */
 374                 if (!rhsc && !changed) {
 375                         rhsc = OHCI_INTR_RHSC;
 376                         ohci_writel(ohci, rhsc, &ohci->regs->intrenable);
 377                 }
 378
 379                 /* Keep on polling until we know a device is connected
 380                  * and RHSC is enabled, or until we autostop.
 381                  */
 382                 if (!ohci->autostop) {
 383                         if (any_connected ||
 384                                         !device_may_wakeup(&ohci_to_hcd(ohci)
 385                                                 ->self.root_hub->dev)) {
 386                                 if (rhsc)
 387                                         poll_rh = 0;
 388                         } else {
 389                                 ohci->autostop = 1;
 390                                 ohci->next_statechange = jiffies + HZ;
 391                         }
 392
 393                 /* if no devices have been attached for one second, autostop */
 394                 } else {
 395                         if (changed || any_connected) {
 396                                 ohci->autostop = 0;
 397                                 ohci->next_statechange = jiffies +
 398                                                 STATECHANGE_DELAY;
 399                         } else if (rhsc && time_after_eq(jiffies,
 400                                                 ohci->next_statechange)
 401                                         && !ohci->ed_rm_list
 402                                         && !(ohci->hc_control &
 403                                                 OHCI_SCHED_ENABLES)) {
 404                                 ohci_rh_suspend(ohci, 1);
 405                                 poll_rh = 0;
 406                         }
 407                 }
 408                 break;
 409
 410         /* if there is a port change, autostart or ask to be resumed */
 411         case OHCI_USB_SUSPEND:
 412         case OHCI_USB_RESUME:
 413                 if (changed) {
 414                         if (ohci->autostop)
 415                                 ohci_rh_resume(ohci);
 416                         else
 417                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
 418                 } else {
 419                         if (!rhsc && (ohci->autostop ||
 420                                         ohci_to_hcd(ohci)->self.root_hub->
 421                                                 do_remote_wakeup))
 422                                 ohci_writel(ohci, OHCI_INTR_RHSC,
 423                                                 &ohci->regs->intrenable);
 424
 425                         /* everything is idle, no need for polling */
 426                         poll_rh = 0;
 427                 }
 428                 break;
 429         }
 430         return poll_rh;
 431 }
 432
 433 #else   /* CONFIG_PM */
 434
 435 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
 436 {
 437         return 0;
 438 }
 439
 440 /* Carry out polling-related state changes.
 441  * autostop isn't used when CONFIG_PM is turned off.
 442  */
 443 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 444                 int any_connected)
 445 {
 446         /* If RHSC is enabled, don't poll */
 447         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
 448                 return 0;
 449
 450         /* If no status changes are pending, enable status-change interrupts */
 451         if (!changed) {
 452                 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
 453                 return 0;
 454         }
 455         return 1;
 456 }
 457
 458 #endif  /* CONFIG_PM */
 459
 460 /*-------------------------------------------------------------------------*/
 461
 462 /* build "status change" packet (one or two bytes) from HC registers */
 463
 464 static int
 465 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 466 {
 467         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 468         int             i, changed = 0, length = 1;
 469         int             any_connected = 0;
 470         unsigned long   flags;
 471
 472         spin_lock_irqsave (&ohci->lock, flags);
 473         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
 474                 goto done;
 475
 476         /* undocumented erratum seen on at least rev D */
 477         if ((ohci->flags & OHCI_QUIRK_AMD756)
 478                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 479                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 480                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 481                 /* retry later; "should not happen" */
 482                 goto done;
 483         }
 484
 485         /* init status */
 486         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 487                 buf [0] = changed = 1;
 488         else
 489                 buf [0] = 0;
 490         if (ohci->num_ports > 7) {
 491                 buf [1] = 0;
 492                 length++;
 493         }
 494
 495         /* look at each port */
 496         for (i = 0; i < ohci->num_ports; i++) {
 497                 u32     status = roothub_portstatus (ohci, i);
 498
 499                 /* can't autostop if ports are connected */
 500                 any_connected |= (status & RH_PS_CCS);
 501
 502                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 503                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 504                         changed = 1;
 505                         if (i < 7)
 506                             buf [0] |= 1 << (i + 1);
 507                         else
 508                             buf [1] |= 1 << (i - 7);
 509                 }
 510         }
 511
 512         hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
 513                         any_connected);
 514
 515 done:
 516         spin_unlock_irqrestore (&ohci->lock, flags);
 517
 518         return changed ? length : 0;
 519 }
 520
 521 /*-------------------------------------------------------------------------*/
 522
 523 static void
 524 ohci_hub_descriptor (
 525         struct ohci_hcd                 *ohci,
 526         struct usb_hub_descriptor       *desc
 527 ) {
 528         u32             rh = roothub_a (ohci);
 529         u16             temp;
 530
 531         desc->bDescriptorType = 0x29;
 532         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 533         desc->bHubContrCurrent = 0;
 534
 535         desc->bNbrPorts = ohci->num_ports;
 536         temp = 1 + (ohci->num_ports / 8);
 537         desc->bDescLength = 7 + 2 * temp;
 538
 539         temp = 0;
 540         if (rh & RH_A_NPS)              /* no power switching? */
 541             temp |= 0x0002;
 542         if (rh & RH_A_PSM)              /* per-port power switching? */
 543             temp |= 0x0001;
 544         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 545             temp |= 0x0010;
 546         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 547             temp |= 0x0008;
 548         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 549
 550         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 551         rh = roothub_b (ohci);
 552         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 553         desc->bitmap [0] = rh & RH_B_DR;
 554         if (ohci->num_ports > 7) {
 555                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 556                 desc->bitmap [2] = 0xff;
 557         } else
 558                 desc->bitmap [1] = 0xff;
 559 }
 560
 561 /*-------------------------------------------------------------------------*/
 562
 563 #ifdef  CONFIG_USB_OTG
 564
 565 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 566 {
 567         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 568         u32                     status;
 569
 570         if (!port)
 571                 return -EINVAL;
 572         port--;
 573
 574         /* start port reset before HNP protocol times out */
 575         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 576         if (!(status & RH_PS_CCS))
 577                 return -ENODEV;
 578
 579         /* khubd will finish the reset later */
 580         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 581         return 0;
 582 }
 583
 584 static void start_hnp(struct ohci_hcd *ohci);
 585
 586 #else
 587
 588 #define ohci_start_port_reset           NULL
 589
 590 #endif
 591
 592 /*-------------------------------------------------------------------------*/
 593
 594
 595 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 596  * not necessarily continuous ... to guard against resume signaling.
 597  * The short timeout is safe for non-root hubs, and is backward-compatible
 598  * with earlier Linux hosts.
 599  */
 600 #ifdef  CONFIG_USB_SUSPEND
 601 #define PORT_RESET_MSEC         50
 602 #else
 603 #define PORT_RESET_MSEC         10
 604 #endif
 605
 606 /* this timer value might be vendor-specific ... */
 607 #define PORT_RESET_HW_MSEC      10
 608
 609 /* wrap-aware logic morphed from <linux/jiffies.h> */
 610 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 611
 612 /* called from some task, normally khubd */
 613 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
 614 {
 615         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 616         u32     temp = 0;
 617         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 618         u16     reset_done = now + PORT_RESET_MSEC;
 619         int     limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
 620
 621         /* build a "continuous enough" reset signal, with up to
 622          * 3msec gap between pulses.  scheduler HZ==100 must work;
 623          * this might need to be deadline-scheduled.
 624          */
 625         do {
 626                 int limit_2;
 627
 628                 /* spin until any current reset finishes */
 629                 limit_2 = PORT_RESET_HW_MSEC * 2;
 630                 while (--limit_2 >= 0) {
 631                         temp = ohci_readl (ohci, portstat);
 632                         /* handle e.g. CardBus eject */
 633                         if (temp == ~(u32)0)
 634                                 return -ESHUTDOWN;
 635                         if (!(temp & RH_PS_PRS))
 636                                 break;
 637                         udelay (500);
 638                 }
 639
 640                 /* timeout (a hardware error) has been observed when
 641                  * EHCI sets CF while this driver is resetting a port;
 642                  * presumably other disconnect paths might do it too.
 643                  */
 644                 if (limit_2 < 0) {
 645                         ohci_dbg(ohci,
 646                                 "port[%d] reset timeout, stat %08x\n",
 647                                 port, temp);
 648                         break;
 649                 }
 650
 651                 if (!(temp & RH_PS_CCS))
 652                         break;
 653                 if (temp & RH_PS_PRSC)
 654                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 655
 656                 /* start the next reset, sleep till it's probably done */
 657                 ohci_writel (ohci, RH_PS_PRS, portstat);
 658                 msleep(PORT_RESET_HW_MSEC);
 659                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 660         } while (tick_before(now, reset_done) && --limit_1 >= 0);
 661
 662         /* caller synchronizes using PRSC ... and handles PRS
 663          * still being set when this returns.
 664          */
 665
 666         return 0;
 667 }
 668
 669 static int ohci_hub_control (
 670         struct usb_hcd  *hcd,
 671         u16             typeReq,
 672         u16             wValue,
 673         u16             wIndex,
 674         char            *buf,
 675         u16             wLength
 676 ) {
 677         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 678         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 679         u32             temp;
 680         int             retval = 0;
 681
 682         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 683                 return -ESHUTDOWN;
 684
 685         switch (typeReq) {
 686         case ClearHubFeature:
 687                 switch (wValue) {
 688                 case C_HUB_OVER_CURRENT:
 689                         ohci_writel (ohci, RH_HS_OCIC,
 690                                         &ohci->regs->roothub.status);
 691                 case C_HUB_LOCAL_POWER:
 692                         break;
 693                 default:
 694                         goto error;
 695                 }
 696                 break;
 697         case ClearPortFeature:
 698                 if (!wIndex || wIndex > ports)
 699                         goto error;
 700                 wIndex--;
 701
 702                 switch (wValue) {
 703                 case USB_PORT_FEAT_ENABLE:
 704                         temp = RH_PS_CCS;
 705                         break;
 706                 case USB_PORT_FEAT_C_ENABLE:
 707                         temp = RH_PS_PESC;
 708                         break;
 709                 case USB_PORT_FEAT_SUSPEND:
 710                         temp = RH_PS_POCI;
 711                         break;
 712                 case USB_PORT_FEAT_C_SUSPEND:
 713                         temp = RH_PS_PSSC;
 714                         break;
 715                 case USB_PORT_FEAT_POWER:
 716                         temp = RH_PS_LSDA;
 717                         break;
 718                 case USB_PORT_FEAT_C_CONNECTION:
 719                         temp = RH_PS_CSC;
 720                         break;
 721                 case USB_PORT_FEAT_C_OVER_CURRENT:
 722                         temp = RH_PS_OCIC;
 723                         break;
 724                 case USB_PORT_FEAT_C_RESET:
 725                         temp = RH_PS_PRSC;
 726                         break;
 727                 default:
 728                         goto error;
 729                 }
 730                 ohci_writel (ohci, temp,
 731                                 &ohci->regs->roothub.portstatus [wIndex]);
 732                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 733                 break;
 734         case GetHubDescriptor:
 735                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 736                 break;
 737         case GetHubStatus:
 738                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 739                 put_unaligned_le32(temp, buf);
 740                 break;
 741         case GetPortStatus:
 742                 if (!wIndex || wIndex > ports)
 743                         goto error;
 744                 wIndex--;
 745                 temp = roothub_portstatus (ohci, wIndex);
 746                 put_unaligned_le32(temp, buf);
 747
 748 #ifndef OHCI_VERBOSE_DEBUG
 749         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 750 #endif
 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                                 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