target/linux/adm5120/files-3.8/drivers/usb/host/adm5120-pm.c

   1 /*
   2  * ADM5120 HCD (Host Controller Driver) for USB
   3  *
   4  * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  * This file was derived from fragments of the OHCI driver.
   7  *   (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   8  *   (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  *
  14  */
  15
  16 #define OHCI_SCHED_ENABLES \
  17         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  18
  19 #ifdef  CONFIG_PM
  20 static int admhc_restart(struct admhcd *ahcd);
  21
  22 static int admhc_rh_suspend(struct admhcd *ahcd, int autostop)
  23 __releases(ahcd->lock)
  24 __acquires(ahcd->lock)
  25 {
  26         int                     status = 0;
  27
  28         ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
  29         switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
  30         case OHCI_USB_RESUME:
  31                 admhc_dbg(ahcd, "resume/suspend?\n");
  32                 ahcd->hc_control &= ~OHCI_CTRL_HCFS;
  33                 ahcd->hc_control |= OHCI_USB_RESET;
  34                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
  35                 (void) admhc_readl(ahcd, &ahcd->regs->control);
  36                 /* FALL THROUGH */
  37         case OHCI_USB_RESET:
  38                 status = -EBUSY;
  39                 admhc_dbg(ahcd, "needs reinit!\n");
  40                 goto done;
  41         case OHCI_USB_SUSPEND:
  42                 if (!ahcd->autostop) {
  43                         admhc_dbg(ahcd, "already suspended\n");
  44                         goto done;
  45                 }
  46         }
  47         admhc_dbg(ahcd, "%s root hub\n",
  48                         autostop ? "auto-stop" : "suspend");
  49
  50         /* First stop any processing */
  51         if (!autostop && (ahcd->hc_control & OHCI_SCHED_ENABLES)) {
  52                 ahcd->hc_control &= ~OHCI_SCHED_ENABLES;
  53                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
  54                 ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
  55                 admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->intrstatus);
  56
  57                 /* sched disables take effect on the next frame,
  58                  * then the last WDH could take 6+ msec
  59                  */
  60                 admhc_dbg(ahcd, "stopping schedules ...\n");
  61                 ahcd->autostop = 0;
  62                 spin_unlock_irq (&ahcd->lock);
  63                 msleep (8);
  64                 spin_lock_irq(&ahcd->lock);
  65         }
  66         dl_done_list (ahcd);
  67         finish_unlinks (ahcd, admhc_frame_no(ahcd));
  68
  69         /* maybe resume can wake root hub */
  70         if (device_may_wakeup(&admhcd_to_hcd(ahcd)->self.root_hub->dev) ||
  71                         autostop)
  72                 ahcd->hc_control |= OHCI_CTRL_RWE;
  73         else {
  74                 admhc_writel(ahcd, OHCI_INTR_RHSC, &ahcd->regs->intrdisable);
  75                 ahcd->hc_control &= ~OHCI_CTRL_RWE;
  76         }
  77
  78         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
  79          * which doesn't imply ports will first be individually suspended.
  80          */
  81         ahcd->hc_control &= ~OHCI_CTRL_HCFS;
  82         ahcd->hc_control |= OHCI_USB_SUSPEND;
  83         admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
  84         (void) admhc_readl(ahcd, &ahcd->regs->control);
  85
  86         /* no resumes until devices finish suspending */
  87         if (!autostop) {
  88                 ahcd->next_statechange = jiffies + msecs_to_jiffies (5);
  89                 ahcd->autostop = 0;
  90         }
  91
  92 done:
  93         return status;
  94 }
  95
  96 static inline struct ed *find_head(struct ed *ed)
  97 {
  98         /* for bulk and control lists */
  99         while (ed->ed_prev)
 100                 ed = ed->ed_prev;
 101         return ed;
 102 }
 103
 104 /* caller has locked the root hub */
 105 static int admhc_rh_resume(struct admhcd *ahcd)
 106 __releases(ahcd->lock)
 107 __acquires(ahcd->lock)
 108 {
 109         struct usb_hcd          *hcd = admhcd_to_hcd (ahcd);
 110         u32                     temp, enables;
 111         int                     status = -EINPROGRESS;
 112         int                     autostopped = ahcd->autostop;
 113
 114         ahcd->autostop = 0;
 115         ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
 116
 117         if (ahcd->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 118                 /* this can happen after resuming a swsusp snapshot */
 119                 if (hcd->state == HC_STATE_RESUMING) {
 120                         admhc_dbg(ahcd, "BIOS/SMM active, control %03x\n",
 121                                         ahcd->hc_control);
 122                         status = -EBUSY;
 123                 /* this happens when pmcore resumes HC then root */
 124                 } else {
 125                         admhc_dbg(ahcd, "duplicate resume\n");
 126                         status = 0;
 127                 }
 128         } else switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
 129         case OHCI_USB_SUSPEND:
 130                 ahcd->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 131                 ahcd->hc_control |= OHCI_USB_RESUME;
 132                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
 133                 (void) admhc_readl(ahcd, &ahcd->regs->control);
 134                 admhc_dbg(ahcd, "%s root hub\n",
 135                                 autostopped ? "auto-start" : "resume");
 136                 break;
 137         case OHCI_USB_RESUME:
 138                 /* HCFS changes sometime after INTR_RD */
 139                 admhc_dbg(ahcd, "%swakeup root hub\n",
 140                                 autostopped ? "auto-" : "");
 141                 break;
 142         case OHCI_USB_OPER:
 143                 /* this can happen after resuming a swsusp snapshot */
 144                 admhc_dbg(ahcd, "snapshot resume? reinit\n");
 145                 status = -EBUSY;
 146                 break;
 147         default:                /* RESET, we lost power */
 148                 admhc_dbg(ahcd, "lost power\n");
 149                 status = -EBUSY;
 150         }
 151         if (status == -EBUSY) {
 152                 if (!autostopped) {
 153                         spin_unlock_irq (&ahcd->lock);
 154                         (void) ahcd_init (ahcd);
 155                         status = admhc_restart (ahcd);
 156                         spin_lock_irq(&ahcd->lock);
 157                 }
 158                 return status;
 159         }
 160         if (status != -EINPROGRESS)
 161                 return status;
 162         if (autostopped)
 163                 goto skip_resume;
 164         spin_unlock_irq (&ahcd->lock);
 165
 166         /* Some controllers (lucent erratum) need extra-long delays */
 167         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 168
 169         temp = admhc_readl(ahcd, &ahcd->regs->control);
 170         temp &= OHCI_CTRL_HCFS;
 171         if (temp != OHCI_USB_RESUME) {
 172                 admhc_err (ahcd, "controller won't resume\n");
 173                 spin_lock_irq(&ahcd->lock);
 174                 return -EBUSY;
 175         }
 176
 177         /* disable old schedule state, reinit from scratch */
 178         admhc_writel(ahcd, 0, &ahcd->regs->ed_controlhead);
 179         admhc_writel(ahcd, 0, &ahcd->regs->ed_controlcurrent);
 180         admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkhead);
 181         admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkcurrent);
 182         admhc_writel(ahcd, 0, &ahcd->regs->ed_periodcurrent);
 183         admhc_writel(ahcd, (u32) ahcd->hcca_dma, &ahcd->ahcd->regs->hcca);
 184
 185         /* Sometimes PCI D3 suspend trashes frame timings ... */
 186         periodic_reinit(ahcd);
 187
 188         /* the following code is executed with ahcd->lock held and
 189          * irqs disabled if and only if autostopped is true
 190          */
 191
 192 skip_resume:
 193         /* interrupts might have been disabled */
 194         admhc_writel(ahcd, OHCI_INTR_INIT, &ahcd->regs->int_enable);
 195         if (ahcd->ed_rm_list)
 196                 admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->int_enable);
 197
 198         /* Then re-enable operations */
 199         admhc_writel(ahcd, OHCI_USB_OPER, &ahcd->regs->control);
 200         (void) admhc_readl(ahcd, &ahcd->regs->control);
 201         if (!autostopped)
 202                 msleep (3);
 203
 204         temp = ahcd->hc_control;
 205         temp &= OHCI_CTRL_RWC;
 206         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 207         ahcd->hc_control = temp;
 208         admhc_writel(ahcd, temp, &ahcd->regs->control);
 209         (void) admhc_readl(ahcd, &ahcd->regs->control);
 210
 211         /* TRSMRCY */
 212         if (!autostopped) {
 213                 msleep (10);
 214                 spin_lock_irq(&ahcd->lock);
 215         }
 216         /* now ahcd->lock is always held and irqs are always disabled */
 217
 218         /* keep it alive for more than ~5x suspend + resume costs */
 219         ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
 220
 221         /* maybe turn schedules back on */
 222         enables = 0;
 223         temp = 0;
 224         if (!ahcd->ed_rm_list) {
 225                 if (ahcd->ed_controltail) {
 226                         admhc_writel(ahcd,
 227                                         find_head (ahcd->ed_controltail)->dma,
 228                                         &ahcd->regs->ed_controlhead);
 229                         enables |= OHCI_CTRL_CLE;
 230                         temp |= OHCI_CLF;
 231                 }
 232                 if (ahcd->ed_bulktail) {
 233                         admhc_writel(ahcd, find_head (ahcd->ed_bulktail)->dma,
 234                                 &ahcd->regs->ed_bulkhead);
 235                         enables |= OHCI_CTRL_BLE;
 236                         temp |= OHCI_BLF;
 237                 }
 238         }
 239         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 240                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 241         if (enables) {
 242                 admhc_dbg(ahcd, "restarting schedules ... %08x\n", enables);
 243                 ahcd->hc_control |= enables;
 244                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
 245                 if (temp)
 246                         admhc_writel(ahcd, temp, &ahcd->regs->cmdstatus);
 247                 (void) admhc_readl(ahcd, &ahcd->regs->control);
 248         }
 249
 250         return 0;
 251 }
 252
 253 static int admhc_bus_suspend(struct usb_hcd *hcd)
 254 {
 255         struct admhcd   *ahcd = hcd_to_admhcd(hcd);
 256         int             rc;
 257
 258         spin_lock_irq(&ahcd->lock);
 259
 260         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 261                 rc = -ESHUTDOWN;
 262         else
 263                 rc = admhc_rh_suspend(ahcd, 0);
 264         spin_unlock_irq(&ahcd->lock);
 265         return rc;
 266 }
 267
 268 static int admhc_bus_resume(struct usb_hcd *hcd)
 269 {
 270         struct admhcd           *ahcd = hcd_to_admhcd(hcd);
 271         int                     rc;
 272
 273         if (time_before(jiffies, ahcd->next_statechange))
 274                 msleep(5);
 275
 276         spin_lock_irq(&ahcd->lock);
 277
 278         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 279                 rc = -ESHUTDOWN;
 280         else
 281                 rc = admhc_rh_resume(ahcd);
 282         spin_unlock_irq(&ahcd->lock);
 283
 284         /* poll until we know a device is connected or we autostop */
 285         if (rc == 0)
 286                 usb_hcd_poll_rh_status(hcd);
 287         return rc;
 288 }
 289
 290 /* Carry out polling-, autostop-, and autoresume-related state changes */
 291 static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed,
 292                 int any_connected)
 293 {
 294         int     poll_rh = 1;
 295
 296         switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
 297
 298         case OHCI_USB_OPER:
 299                 /* keep on polling until we know a device is connected
 300                  * and RHSC is enabled */
 301                 if (!ahcd->autostop) {
 302                         if (any_connected ||
 303                                         !device_may_wakeup(&admhcd_to_hcd(ahcd)
 304                                                 ->self.root_hub->dev)) {
 305                                 if (admhc_readl(ahcd, &ahcd->regs->int_enable) &
 306                                                 OHCI_INTR_RHSC)
 307                                         poll_rh = 0;
 308                         } else {
 309                                 ahcd->autostop = 1;
 310                                 ahcd->next_statechange = jiffies + HZ;
 311                         }
 312
 313                 /* if no devices have been attached for one second, autostop */
 314                 } else {
 315                         if (changed || any_connected) {
 316                                 ahcd->autostop = 0;
 317                                 ahcd->next_statechange = jiffies +
 318                                                 STATECHANGE_DELAY;
 319                         } else if (time_after_eq(jiffies,
 320                                                 ahcd->next_statechange)
 321                                         && !ahcd->ed_rm_list
 322                                         && !(ahcd->hc_control &
 323                                                 OHCI_SCHED_ENABLES)) {
 324                                 ahcd_rh_suspend(ahcd, 1);
 325                         }
 326                 }
 327                 break;
 328
 329         /* if there is a port change, autostart or ask to be resumed */
 330         case OHCI_USB_SUSPEND:
 331         case OHCI_USB_RESUME:
 332                 if (changed) {
 333                         if (ahcd->autostop)
 334                                 admhc_rh_resume(ahcd);
 335                         else
 336                                 usb_hcd_resume_root_hub(admhcd_to_hcd(ahcd));
 337                 } else {
 338                         /* everything is idle, no need for polling */
 339                         poll_rh = 0;
 340                 }
 341                 break;
 342         }
 343         return poll_rh;
 344 }
 345
 346 /*-------------------------------------------------------------------------*/
 347
 348 /* must not be called from interrupt context */
 349 static int admhc_restart(struct admhcd *ahcd)
 350 {
 351         int temp;
 352         int i;
 353         struct urb_priv *priv;
 354
 355         /* mark any devices gone, so they do nothing till khubd disconnects.
 356          * recycle any "live" eds/tds (and urbs) right away.
 357          * later, khubd disconnect processing will recycle the other state,
 358          * (either as disconnect/reconnect, or maybe someday as a reset).
 359          */
 360         spin_lock_irq(&ahcd->lock);
 361         admhc_disable(ahcd);
 362         usb_root_hub_lost_power(admhcd_to_hcd(ahcd)->self.root_hub);
 363         if (!list_empty(&ahcd->pending))
 364                 admhc_dbg(ahcd, "abort schedule...\n");
 365                 list_for_each_entry(priv, &ahcd->pending, pending) {
 366                 struct urb      *urb = priv->td[0]->urb;
 367                 struct ed       *ed = priv->ed;
 368
 369                 switch (ed->state) {
 370                 case ED_OPER:
 371                         ed->state = ED_UNLINK;
 372                         ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE);
 373                         ed_deschedule (ahcd, ed);
 374
 375                         ed->ed_next = ahcd->ed_rm_list;
 376                         ed->ed_prev = NULL;
 377                         ahcd->ed_rm_list = ed;
 378                         /* FALLTHROUGH */
 379                 case ED_UNLINK:
 380                         break;
 381                 default:
 382                         admhc_dbg(ahcd, "bogus ed %p state %d\n",
 383                                         ed, ed->state);
 384                 }
 385
 386                 if (!urb->unlinked)
 387                         urb->unlinked = -ESHUTDOWN;
 388         }
 389         finish_unlinks(ahcd, 0);
 390         spin_unlock_irq(&ahcd->lock);
 391
 392         /* paranoia, in case that didn't work: */
 393
 394         /* empty the interrupt branches */
 395         for (i = 0; i < NUM_INTS; i++) ahcd->load[i] = 0;
 396         for (i = 0; i < NUM_INTS; i++) ahcd->hcca->int_table[i] = 0;
 397
 398         /* no EDs to remove */
 399         ahcd->ed_rm_list = NULL;
 400
 401         /* empty control and bulk lists */
 402         ahcd->ed_controltail = NULL;
 403         ahcd->ed_bulktail    = NULL;
 404
 405         if ((temp = admhc_run(ahcd)) < 0) {
 406                 admhc_err(ahcd, "can't restart, %d\n", temp);
 407                 return temp;
 408         } else {
 409                 /* here we "know" root ports should always stay powered,
 410                  * and that if we try to turn them back on the root hub
 411                  * will respond to CSC processing.
 412                  */
 413                 i = ahcd->num_ports;
 414                 while (i--)
 415                         admhc_writel(ahcd, RH_PS_PSS,
 416                                 &ahcd->regs->portstatus[i]);
 417                 admhc_dbg(ahcd, "restart complete\n");
 418         }
 419         return 0;
 420 }
 421
 422 #else   /* CONFIG_PM */
 423
 424 static inline int admhc_rh_resume(struct admhcd *ahcd)
 425 {
 426         return 0;
 427 }
 428
 429 /* Carry out polling-related state changes.
 430  * autostop isn't used when CONFIG_PM is turned off.
 431  */
 432 static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed,
 433                 int any_connected)
 434 {
 435         /* If INSM is enabled, don't poll */
 436         if (admhc_readl(ahcd, &ahcd->regs->int_enable) & ADMHC_INTR_INSM)
 437                 return 0;
 438
 439         /* If no status changes are pending, enable status-change interrupts */
 440         if (!changed) {
 441                 admhc_intr_enable(ahcd, ADMHC_INTR_INSM);
 442                 return 0;
 443         }
 444
 445         return 1;
 446 }
 447
 448 #endif  /* CONFIG_PM */
 449