target/linux/adm5120/files/drivers/usb/host/adm5120-pm.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 #define OHCI_SCHED_ENABLES \
  11         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  12
  13 #ifdef  CONFIG_PM
  14 static int admhc_restart(struct admhcd *ahcd);
  15
  16 static int admhc_rh_suspend(struct admhcd *ahcd, int autostop)
  17 __releases(ahcd->lock)
  18 __acquires(ahcd->lock)
  19 {
  20         int                     status = 0;
  21
  22         ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
  23         switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
  24         case OHCI_USB_RESUME:
  25                 admhc_dbg(ahcd, "resume/suspend?\n");
  26                 ahcd->hc_control &= ~OHCI_CTRL_HCFS;
  27                 ahcd->hc_control |= OHCI_USB_RESET;
  28                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
  29                 (void) admhc_readl(ahcd, &ahcd->regs->control);
  30                 /* FALL THROUGH */
  31         case OHCI_USB_RESET:
  32                 status = -EBUSY;
  33                 admhc_dbg(ahcd, "needs reinit!\n");
  34                 goto done;
  35         case OHCI_USB_SUSPEND:
  36                 if (!ahcd->autostop) {
  37                         admhc_dbg(ahcd, "already suspended\n");
  38                         goto done;
  39                 }
  40         }
  41         admhc_dbg(ahcd, "%s root hub\n",
  42                         autostop ? "auto-stop" : "suspend");
  43
  44         /* First stop any processing */
  45         if (!autostop && (ahcd->hc_control & OHCI_SCHED_ENABLES)) {
  46                 ahcd->hc_control &= ~OHCI_SCHED_ENABLES;
  47                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
  48                 ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
  49                 admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->intrstatus);
  50
  51                 /* sched disables take effect on the next frame,
  52                  * then the last WDH could take 6+ msec
  53                  */
  54                 admhc_dbg(ahcd, "stopping schedules ...\n");
  55                 ahcd->autostop = 0;
  56                 spin_unlock_irq (&ahcd->lock);
  57                 msleep (8);
  58                 spin_lock_irq(&ahcd->lock);
  59         }
  60         dl_done_list (ahcd);
  61         finish_unlinks (ahcd, admhc_frame_no(ahcd));
  62
  63         /* maybe resume can wake root hub */
  64         if (device_may_wakeup(&admhcd_to_hcd(ahcd)->self.root_hub->dev) ||
  65                         autostop)
  66                 ahcd->hc_control |= OHCI_CTRL_RWE;
  67         else {
  68                 admhc_writel(ahcd, OHCI_INTR_RHSC, &ahcd->regs->intrdisable);
  69                 ahcd->hc_control &= ~OHCI_CTRL_RWE;
  70         }
  71
  72         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
  73          * which doesn't imply ports will first be individually suspended.
  74          */
  75         ahcd->hc_control &= ~OHCI_CTRL_HCFS;
  76         ahcd->hc_control |= OHCI_USB_SUSPEND;
  77         admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
  78         (void) admhc_readl(ahcd, &ahcd->regs->control);
  79
  80         /* no resumes until devices finish suspending */
  81         if (!autostop) {
  82                 ahcd->next_statechange = jiffies + msecs_to_jiffies (5);
  83                 ahcd->autostop = 0;
  84         }
  85
  86 done:
  87         return status;
  88 }
  89
  90 static inline struct ed *find_head(struct ed *ed)
  91 {
  92         /* for bulk and control lists */
  93         while (ed->ed_prev)
  94                 ed = ed->ed_prev;
  95         return ed;
  96 }
  97
  98 /* caller has locked the root hub */
  99 static int admhc_rh_resume(struct admhcd *ahcd)
 100 __releases(ahcd->lock)
 101 __acquires(ahcd->lock)
 102 {
 103         struct usb_hcd          *hcd = admhcd_to_hcd (ahcd);
 104         u32                     temp, enables;
 105         int                     status = -EINPROGRESS;
 106         int                     autostopped = ahcd->autostop;
 107
 108         ahcd->autostop = 0;
 109         ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
 110
 111         if (ahcd->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 112                 /* this can happen after resuming a swsusp snapshot */
 113                 if (hcd->state == HC_STATE_RESUMING) {
 114                         admhc_dbg(ahcd, "BIOS/SMM active, control %03x\n",
 115                                         ahcd->hc_control);
 116                         status = -EBUSY;
 117                 /* this happens when pmcore resumes HC then root */
 118                 } else {
 119                         admhc_dbg(ahcd, "duplicate resume\n");
 120                         status = 0;
 121                 }
 122         } else switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
 123         case OHCI_USB_SUSPEND:
 124                 ahcd->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 125                 ahcd->hc_control |= OHCI_USB_RESUME;
 126                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
 127                 (void) admhc_readl(ahcd, &ahcd->regs->control);
 128                 admhc_dbg(ahcd, "%s root hub\n",
 129                                 autostopped ? "auto-start" : "resume");
 130                 break;
 131         case OHCI_USB_RESUME:
 132                 /* HCFS changes sometime after INTR_RD */
 133                 admhc_dbg(ahcd, "%swakeup root hub\n",
 134                                 autostopped ? "auto-" : "");
 135                 break;
 136         case OHCI_USB_OPER:
 137                 /* this can happen after resuming a swsusp snapshot */
 138                 admhc_dbg(ahcd, "snapshot resume? reinit\n");
 139                 status = -EBUSY;
 140                 break;
 141         default:                /* RESET, we lost power */
 142                 admhc_dbg(ahcd, "lost power\n");
 143                 status = -EBUSY;
 144         }
 145         if (status == -EBUSY) {
 146                 if (!autostopped) {
 147                         spin_unlock_irq (&ahcd->lock);
 148                         (void) ahcd_init (ahcd);
 149                         status = admhc_restart (ahcd);
 150                         spin_lock_irq(&ahcd->lock);
 151                 }
 152                 return status;
 153         }
 154         if (status != -EINPROGRESS)
 155                 return status;
 156         if (autostopped)
 157                 goto skip_resume;
 158         spin_unlock_irq (&ahcd->lock);
 159
 160         /* Some controllers (lucent erratum) need extra-long delays */
 161         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 162
 163         temp = admhc_readl(ahcd, &ahcd->regs->control);
 164         temp &= OHCI_CTRL_HCFS;
 165         if (temp != OHCI_USB_RESUME) {
 166                 admhc_err (ahcd, "controller won't resume\n");
 167                 spin_lock_irq(&ahcd->lock);
 168                 return -EBUSY;
 169         }
 170
 171         /* disable old schedule state, reinit from scratch */
 172         admhc_writel(ahcd, 0, &ahcd->regs->ed_controlhead);
 173         admhc_writel(ahcd, 0, &ahcd->regs->ed_controlcurrent);
 174         admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkhead);
 175         admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkcurrent);
 176         admhc_writel(ahcd, 0, &ahcd->regs->ed_periodcurrent);
 177         admhc_writel(ahcd, (u32) ahcd->hcca_dma, &ahcd->ahcd->regs->hcca);
 178
 179         /* Sometimes PCI D3 suspend trashes frame timings ... */
 180         periodic_reinit(ahcd);
 181
 182         /* the following code is executed with ahcd->lock held and
 183          * irqs disabled if and only if autostopped is true
 184          */
 185
 186 skip_resume:
 187         /* interrupts might have been disabled */
 188         admhc_writel(ahcd, OHCI_INTR_INIT, &ahcd->regs->int_enable);
 189         if (ahcd->ed_rm_list)
 190                 admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->int_enable);
 191
 192         /* Then re-enable operations */
 193         admhc_writel(ahcd, OHCI_USB_OPER, &ahcd->regs->control);
 194         (void) admhc_readl(ahcd, &ahcd->regs->control);
 195         if (!autostopped)
 196                 msleep (3);
 197
 198         temp = ahcd->hc_control;
 199         temp &= OHCI_CTRL_RWC;
 200         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 201         ahcd->hc_control = temp;
 202         admhc_writel(ahcd, temp, &ahcd->regs->control);
 203         (void) admhc_readl(ahcd, &ahcd->regs->control);
 204
 205         /* TRSMRCY */
 206         if (!autostopped) {
 207                 msleep (10);
 208                 spin_lock_irq(&ahcd->lock);
 209         }
 210         /* now ahcd->lock is always held and irqs are always disabled */
 211
 212         /* keep it alive for more than ~5x suspend + resume costs */
 213         ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
 214
 215         /* maybe turn schedules back on */
 216         enables = 0;
 217         temp = 0;
 218         if (!ahcd->ed_rm_list) {
 219                 if (ahcd->ed_controltail) {
 220                         admhc_writel(ahcd,
 221                                         find_head (ahcd->ed_controltail)->dma,
 222                                         &ahcd->regs->ed_controlhead);
 223                         enables |= OHCI_CTRL_CLE;
 224                         temp |= OHCI_CLF;
 225                 }
 226                 if (ahcd->ed_bulktail) {
 227                         admhc_writel(ahcd, find_head (ahcd->ed_bulktail)->dma,
 228                                 &ahcd->regs->ed_bulkhead);
 229                         enables |= OHCI_CTRL_BLE;
 230                         temp |= OHCI_BLF;
 231                 }
 232         }
 233         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 234                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 235         if (enables) {
 236                 admhc_dbg(ahcd, "restarting schedules ... %08x\n", enables);
 237                 ahcd->hc_control |= enables;
 238                 admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
 239                 if (temp)
 240                         admhc_writel(ahcd, temp, &ahcd->regs->cmdstatus);
 241                 (void) admhc_readl(ahcd, &ahcd->regs->control);
 242         }
 243
 244         return 0;
 245 }
 246
 247 static int admhc_bus_suspend(struct usb_hcd *hcd)
 248 {
 249         struct admhcd   *ahcd = hcd_to_admhcd(hcd);
 250         int             rc;
 251
 252         spin_lock_irq(&ahcd->lock);
 253
 254         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 255                 rc = -ESHUTDOWN;
 256         else
 257                 rc = admhc_rh_suspend(ahcd, 0);
 258         spin_unlock_irq(&ahcd->lock);
 259         return rc;
 260 }
 261
 262 static int admhc_bus_resume(struct usb_hcd *hcd)
 263 {
 264         struct admhcd           *ahcd = hcd_to_admhcd(hcd);
 265         int                     rc;
 266
 267         if (time_before(jiffies, ahcd->next_statechange))
 268                 msleep(5);
 269
 270         spin_lock_irq(&ahcd->lock);
 271
 272         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 273                 rc = -ESHUTDOWN;
 274         else
 275                 rc = admhc_rh_resume(ahcd);
 276         spin_unlock_irq(&ahcd->lock);
 277
 278         /* poll until we know a device is connected or we autostop */
 279         if (rc == 0)
 280                 usb_hcd_poll_rh_status(hcd);
 281         return rc;
 282 }
 283
 284 /* Carry out polling-, autostop-, and autoresume-related state changes */
 285 static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed,
 286                 int any_connected)
 287 {
 288         int     poll_rh = 1;
 289
 290         switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
 291
 292         case OHCI_USB_OPER:
 293                 /* keep on polling until we know a device is connected
 294                  * and RHSC is enabled */
 295                 if (!ahcd->autostop) {
 296                         if (any_connected ||
 297                                         !device_may_wakeup(&admhcd_to_hcd(ahcd)
 298                                                 ->self.root_hub->dev)) {
 299                                 if (admhc_readl(ahcd, &ahcd->regs->int_enable) &
 300                                                 OHCI_INTR_RHSC)
 301                                         poll_rh = 0;
 302                         } else {
 303                                 ahcd->autostop = 1;
 304                                 ahcd->next_statechange = jiffies + HZ;
 305                         }
 306
 307                 /* if no devices have been attached for one second, autostop */
 308                 } else {
 309                         if (changed || any_connected) {
 310                                 ahcd->autostop = 0;
 311                                 ahcd->next_statechange = jiffies +
 312                                                 STATECHANGE_DELAY;
 313                         } else if (time_after_eq(jiffies,
 314                                                 ahcd->next_statechange)
 315                                         && !ahcd->ed_rm_list
 316                                         && !(ahcd->hc_control &
 317                                                 OHCI_SCHED_ENABLES)) {
 318                                 ahcd_rh_suspend(ahcd, 1);
 319                         }
 320                 }
 321                 break;
 322
 323         /* if there is a port change, autostart or ask to be resumed */
 324         case OHCI_USB_SUSPEND:
 325         case OHCI_USB_RESUME:
 326                 if (changed) {
 327                         if (ahcd->autostop)
 328                                 admhc_rh_resume(ahcd);
 329                         else
 330                                 usb_hcd_resume_root_hub(admhcd_to_hcd(ahcd));
 331                 } else {
 332                         /* everything is idle, no need for polling */
 333                         poll_rh = 0;
 334                 }
 335                 break;
 336         }
 337         return poll_rh;
 338 }
 339
 340 /*-------------------------------------------------------------------------*/
 341
 342 /* must not be called from interrupt context */
 343 static int admhc_restart(struct admhcd *ahcd)
 344 {
 345         int temp;
 346         int i;
 347         struct urb_priv *priv;
 348
 349         /* mark any devices gone, so they do nothing till khubd disconnects.
 350          * recycle any "live" eds/tds (and urbs) right away.
 351          * later, khubd disconnect processing will recycle the other state,
 352          * (either as disconnect/reconnect, or maybe someday as a reset).
 353          */
 354         spin_lock_irq(&ahcd->lock);
 355         admhc_disable(ahcd);
 356         usb_root_hub_lost_power(admhcd_to_hcd(ahcd)->self.root_hub);
 357         if (!list_empty(&ahcd->pending))
 358                 admhc_dbg(ahcd, "abort schedule...\n");
 359                 list_for_each_entry(priv, &ahcd->pending, pending) {
 360                 struct urb      *urb = priv->td[0]->urb;
 361                 struct ed       *ed = priv->ed;
 362
 363                 switch (ed->state) {
 364                 case ED_OPER:
 365                         ed->state = ED_UNLINK;
 366                         ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE);
 367                         ed_deschedule (ahcd, ed);
 368
 369                         ed->ed_next = ahcd->ed_rm_list;
 370                         ed->ed_prev = NULL;
 371                         ahcd->ed_rm_list = ed;
 372                         /* FALLTHROUGH */
 373                 case ED_UNLINK:
 374                         break;
 375                 default:
 376                         admhc_dbg(ahcd, "bogus ed %p state %d\n",
 377                                         ed, ed->state);
 378                 }
 379
 380                 spin_lock(&urb->lock);
 381                 urb->status = -ESHUTDOWN;
 382                 spin_unlock(&urb->lock);
 383         }
 384         finish_unlinks(ahcd, 0);
 385         spin_unlock_irq(&ahcd->lock);
 386
 387         /* paranoia, in case that didn't work: */
 388
 389         /* empty the interrupt branches */
 390         for (i = 0; i < NUM_INTS; i++) ahcd->load[i] = 0;
 391         for (i = 0; i < NUM_INTS; i++) ahcd->hcca->int_table[i] = 0;
 392
 393         /* no EDs to remove */
 394         ahcd->ed_rm_list = NULL;
 395
 396         /* empty control and bulk lists */
 397         ahcd->ed_controltail = NULL;
 398         ahcd->ed_bulktail    = NULL;
 399
 400         if ((temp = admhc_run(ahcd)) < 0) {
 401                 admhc_err(ahcd, "can't restart, %d\n", temp);
 402                 return temp;
 403         } else {
 404                 /* here we "know" root ports should always stay powered,
 405                  * and that if we try to turn them back on the root hub
 406                  * will respond to CSC processing.
 407                  */
 408                 i = ahcd->num_ports;
 409                 while (i--)
 410                         admhc_writel(ahcd, RH_PS_PSS,
 411                                 &ahcd->regs->portstatus[i]);
 412                 admhc_dbg(ahcd, "restart complete\n");
 413         }
 414         return 0;
 415 }
 416
 417 #else   /* CONFIG_PM */
 418
 419 static inline int admhc_rh_resume(struct admhcd *ahcd)
 420 {
 421         return 0;
 422 }
 423
 424 /* Carry out polling-related state changes.
 425  * autostop isn't used when CONFIG_PM is turned off.
 426  */
 427 static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed,
 428                 int any_connected)
 429 {
 430         int     poll_rh = 1;
 431
 432         /* keep on polling until RHSC is enabled */
 433         if (admhc_readl(ahcd, &ahcd->regs->int_enable) & ADMHC_INTR_INSM)
 434                 poll_rh = 0;
 435
 436         return poll_rh;
 437 }
 438
 439 #endif  /* CONFIG_PM */
 440