drivers/usb/host/ehci-hub.c

   1 /*
   2  * Copyright (C) 2001-2004 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * EHCI Root Hub ... the nonsharable stuff
  25  *
  26  * Registers don't need cpu_to_le32, that happens transparently
  27  */
  28
  29 /*-------------------------------------------------------------------------*/
  30
  31 #ifdef  CONFIG_PM
  32
  33 static int ehci_bus_suspend (struct usb_hcd *hcd)
  34 {
  35         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
  36         int                     port;
  37
  38         if (time_before (jiffies, ehci->next_statechange))
  39                 msleep(5);
  40
  41         port = HCS_N_PORTS (ehci->hcs_params);
  42         spin_lock_irq (&ehci->lock);
  43
  44         /* stop schedules, clean any completed work */
  45         if (HC_IS_RUNNING(hcd->state)) {
  46                 ehci_quiesce (ehci);
  47                 hcd->state = HC_STATE_QUIESCING;
  48         }
  49         ehci->command = readl (&ehci->regs->command);
  50         if (ehci->reclaim)
  51                 ehci->reclaim_ready = 1;
  52         ehci_work(ehci, NULL);
  53
  54         /* suspend any active/unsuspended ports, maybe allow wakeup */
  55         while (port--) {
  56                 u32 __iomem     *reg = &ehci->regs->port_status [port];
  57                 u32             t1 = readl (reg) & ~PORT_RWC_BITS;
  58                 u32             t2 = t1;
  59
  60                 if ((t1 & PORT_PE) && !(t1 & PORT_OWNER))
  61                         t2 |= PORT_SUSPEND;
  62                 if (device_may_wakeup(&hcd->self.root_hub->dev))
  63                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
  64                 else
  65                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
  66
  67                 if (t1 != t2) {
  68                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
  69                                 port + 1, t1, t2);
  70                         writel (t2, reg);
  71                 }
  72         }
  73
  74         /* turn off now-idle HC */
  75         del_timer_sync (&ehci->watchdog);
  76         ehci_halt (ehci);
  77         hcd->state = HC_STATE_SUSPENDED;
  78
  79         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
  80         spin_unlock_irq (&ehci->lock);
  81         return 0;
  82 }
  83
  84
  85 /* caller has locked the root hub, and should reset/reinit on error */
  86 static int ehci_bus_resume (struct usb_hcd *hcd)
  87 {
  88         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
  89         u32                     temp;
  90         int                     i;
  91         int                     intr_enable;
  92
  93         if (time_before (jiffies, ehci->next_statechange))
  94                 msleep(5);
  95         spin_lock_irq (&ehci->lock);
  96
  97         /* Ideally and we've got a real resume here, and no port's power
  98          * was lost.  (For PCI, that means Vaux was maintained.)  But we
  99          * could instead be restoring a swsusp snapshot -- so that BIOS was
 100          * the last user of the controller, not reset/pm hardware keeping
 101          * state we gave to it.
 102          */
 103
 104         /* re-init operational registers in case we lost power */
 105         if (readl (&ehci->regs->intr_enable) == 0) {
 106                 /* at least some APM implementations will try to deliver
 107                  * IRQs right away, so delay them until we're ready.
 108                  */
 109                 intr_enable = 1;
 110                 writel (0, &ehci->regs->segment);
 111                 writel (ehci->periodic_dma, &ehci->regs->frame_list);
 112                 writel ((u32)ehci->async->qh_dma, &ehci->regs->async_next);
 113         } else
 114                 intr_enable = 0;
 115         ehci_dbg(ehci, "resume root hub%s\n",
 116                         intr_enable ? " after power loss" : "");
 117
 118         /* restore CMD_RUN, framelist size, and irq threshold */
 119         writel (ehci->command, &ehci->regs->command);
 120
 121         /* take ports out of suspend */
 122         i = HCS_N_PORTS (ehci->hcs_params);
 123         while (i--) {
 124                 temp = readl (&ehci->regs->port_status [i]);
 125                 temp &= ~(PORT_RWC_BITS
 126                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
 127                 if (temp & PORT_SUSPEND) {
 128                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 129                         temp |= PORT_RESUME;
 130                 }
 131                 writel (temp, &ehci->regs->port_status [i]);
 132         }
 133         i = HCS_N_PORTS (ehci->hcs_params);
 134         mdelay (20);
 135         while (i--) {
 136                 temp = readl (&ehci->regs->port_status [i]);
 137                 if ((temp & PORT_SUSPEND) == 0)
 138                         continue;
 139                 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 140                 writel (temp, &ehci->regs->port_status [i]);
 141                 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 142         }
 143         (void) readl (&ehci->regs->command);
 144
 145         /* maybe re-activate the schedule(s) */
 146         temp = 0;
 147         if (ehci->async->qh_next.qh)
 148                 temp |= CMD_ASE;
 149         if (ehci->periodic_sched)
 150                 temp |= CMD_PSE;
 151         if (temp) {
 152                 ehci->command |= temp;
 153                 writel (ehci->command, &ehci->regs->command);
 154         }
 155
 156         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 157         hcd->state = HC_STATE_RUNNING;
 158
 159         /* Now we can safely re-enable irqs */
 160         if (intr_enable)
 161                 writel (INTR_MASK, &ehci->regs->intr_enable);
 162
 163         spin_unlock_irq (&ehci->lock);
 164         return 0;
 165 }
 166
 167 #else
 168
 169 #define ehci_bus_suspend        NULL
 170 #define ehci_bus_resume         NULL
 171
 172 #endif  /* CONFIG_PM */
 173
 174 /*-------------------------------------------------------------------------*/
 175
 176 static int check_reset_complete (
 177         struct ehci_hcd *ehci,
 178         int             index,
 179         int             port_status
 180 ) {
 181         if (!(port_status & PORT_CONNECT)) {
 182                 ehci->reset_done [index] = 0;
 183                 return port_status;
 184         }
 185
 186         /* if reset finished and it's still not enabled -- handoff */
 187         if (!(port_status & PORT_PE)) {
 188
 189                 /* with integrated TT, there's nobody to hand it to! */
 190                 if (ehci_is_TDI(ehci)) {
 191                         ehci_dbg (ehci,
 192                                 "Failed to enable port %d on root hub TT\n",
 193                                 index+1);
 194                         return port_status;
 195                 }
 196
 197                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 198                         index + 1);
 199
 200                 // what happens if HCS_N_CC(params) == 0 ?
 201                 port_status |= PORT_OWNER;
 202                 port_status &= ~PORT_RWC_BITS;
 203                 writel (port_status, &ehci->regs->port_status [index]);
 204
 205         } else
 206                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 207
 208         return port_status;
 209 }
 210
 211 /*-------------------------------------------------------------------------*/
 212
 213
 214 /* build "status change" packet (one or two bytes) from HC registers */
 215
 216 static int
 217 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 218 {
 219         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 220         u32             temp, status = 0;
 221         int             ports, i, retval = 1;
 222         unsigned long   flags;
 223
 224         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 225         if (!HC_IS_RUNNING(hcd->state))
 226                 return 0;
 227
 228         /* init status to no-changes */
 229         buf [0] = 0;
 230         ports = HCS_N_PORTS (ehci->hcs_params);
 231         if (ports > 7) {
 232                 buf [1] = 0;
 233                 retval++;
 234         }
 235
 236         /* no hub change reports (bit 0) for now (power, ...) */
 237
 238         /* port N changes (bit N)? */
 239         spin_lock_irqsave (&ehci->lock, flags);
 240         for (i = 0; i < ports; i++) {
 241                 temp = readl (&ehci->regs->port_status [i]);
 242                 if (temp & PORT_OWNER) {
 243                         /* don't report this in GetPortStatus */
 244                         if (temp & PORT_CSC) {
 245                                 temp &= ~PORT_RWC_BITS;
 246                                 temp |= PORT_CSC;
 247                                 writel (temp, &ehci->regs->port_status [i]);
 248                         }
 249                         continue;
 250                 }
 251                 if (!(temp & PORT_CONNECT))
 252                         ehci->reset_done [i] = 0;
 253                 if ((temp & (PORT_CSC | PORT_PEC | PORT_OCC)) != 0
 254                                 // PORT_STAT_C_SUSPEND?
 255                                 || ((temp & PORT_RESUME) != 0
 256                                         && time_after (jiffies,
 257                                                 ehci->reset_done [i]))) {
 258                         if (i < 7)
 259                             buf [0] |= 1 << (i + 1);
 260                         else
 261                             buf [1] |= 1 << (i - 7);
 262                         status = STS_PCD;
 263                 }
 264         }
 265         /* FIXME autosuspend idle root hubs */
 266         spin_unlock_irqrestore (&ehci->lock, flags);
 267         return status ? retval : 0;
 268 }
 269
 270 /*-------------------------------------------------------------------------*/
 271
 272 static void
 273 ehci_hub_descriptor (
 274         struct ehci_hcd                 *ehci,
 275         struct usb_hub_descriptor       *desc
 276 ) {
 277         int             ports = HCS_N_PORTS (ehci->hcs_params);
 278         u16             temp;
 279
 280         desc->bDescriptorType = 0x29;
 281         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 282         desc->bHubContrCurrent = 0;
 283
 284         desc->bNbrPorts = ports;
 285         temp = 1 + (ports / 8);
 286         desc->bDescLength = 7 + 2 * temp;
 287
 288         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 289         memset (&desc->bitmap [0], 0, temp);
 290         memset (&desc->bitmap [temp], 0xff, temp);
 291
 292         temp = 0x0008;                  /* per-port overcurrent reporting */
 293         if (HCS_PPC (ehci->hcs_params))
 294                 temp |= 0x0001;         /* per-port power control */
 295         else
 296                 temp |= 0x0002;         /* no power switching */
 297 #if 0
 298 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 299         if (HCS_INDICATOR (ehci->hcs_params))
 300                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 301 #endif
 302         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
 303 }
 304
 305 /*-------------------------------------------------------------------------*/
 306
 307 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 308
 309 static int ehci_hub_control (
 310         struct usb_hcd  *hcd,
 311         u16             typeReq,
 312         u16             wValue,
 313         u16             wIndex,
 314         char            *buf,
 315         u16             wLength
 316 ) {
 317         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 318         int             ports = HCS_N_PORTS (ehci->hcs_params);
 319         u32             temp, status;
 320         unsigned long   flags;
 321         int             retval = 0;
 322
 323         /*
 324          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 325          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 326          * (track current state ourselves) ... blink for diagnostics,
 327          * power, "this is the one", etc.  EHCI spec supports this.
 328          */
 329
 330         spin_lock_irqsave (&ehci->lock, flags);
 331         switch (typeReq) {
 332         case ClearHubFeature:
 333                 switch (wValue) {
 334                 case C_HUB_LOCAL_POWER:
 335                 case C_HUB_OVER_CURRENT:
 336                         /* no hub-wide feature/status flags */
 337                         break;
 338                 default:
 339                         goto error;
 340                 }
 341                 break;
 342         case ClearPortFeature:
 343                 if (!wIndex || wIndex > ports)
 344                         goto error;
 345                 wIndex--;
 346                 temp = readl (&ehci->regs->port_status [wIndex]);
 347                 if (temp & PORT_OWNER)
 348                         break;
 349
 350                 switch (wValue) {
 351                 case USB_PORT_FEAT_ENABLE:
 352                         writel (temp & ~PORT_PE,
 353                                 &ehci->regs->port_status [wIndex]);
 354                         break;
 355                 case USB_PORT_FEAT_C_ENABLE:
 356                         writel((temp & ~PORT_RWC_BITS) | PORT_PEC,
 357                                 &ehci->regs->port_status [wIndex]);
 358                         break;
 359                 case USB_PORT_FEAT_SUSPEND:
 360                         if (temp & PORT_RESET)
 361                                 goto error;
 362                         if (ehci->no_selective_suspend)
 363                                 break;
 364                         if (temp & PORT_SUSPEND) {
 365                                 if ((temp & PORT_PE) == 0)
 366                                         goto error;
 367                                 /* resume signaling for 20 msec */
 368                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 369                                 writel (temp | PORT_RESUME,
 370                                         &ehci->regs->port_status [wIndex]);
 371                                 ehci->reset_done [wIndex] = jiffies
 372                                                 + msecs_to_jiffies (20);
 373                         }
 374                         break;
 375                 case USB_PORT_FEAT_C_SUSPEND:
 376                         /* we auto-clear this feature */
 377                         break;
 378                 case USB_PORT_FEAT_POWER:
 379                         if (HCS_PPC (ehci->hcs_params))
 380                                 writel (temp & ~(PORT_RWC_BITS | PORT_POWER),
 381                                         &ehci->regs->port_status [wIndex]);
 382                         break;
 383                 case USB_PORT_FEAT_C_CONNECTION:
 384                         writel((temp & ~PORT_RWC_BITS) | PORT_CSC,
 385                                 &ehci->regs->port_status [wIndex]);
 386                         break;
 387                 case USB_PORT_FEAT_C_OVER_CURRENT:
 388                         writel((temp & ~PORT_RWC_BITS) | PORT_OCC,
 389                                 &ehci->regs->port_status [wIndex]);
 390                         break;
 391                 case USB_PORT_FEAT_C_RESET:
 392                         /* GetPortStatus clears reset */
 393                         break;
 394                 default:
 395                         goto error;
 396                 }
 397                 readl (&ehci->regs->command);   /* unblock posted write */
 398                 break;
 399         case GetHubDescriptor:
 400                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 401                         buf);
 402                 break;
 403         case GetHubStatus:
 404                 /* no hub-wide feature/status flags */
 405                 memset (buf, 0, 4);
 406                 //cpu_to_le32s ((u32 *) buf);
 407                 break;
 408         case GetPortStatus:
 409                 if (!wIndex || wIndex > ports)
 410                         goto error;
 411                 wIndex--;
 412                 status = 0;
 413                 temp = readl (&ehci->regs->port_status [wIndex]);
 414
 415                 // wPortChange bits
 416                 if (temp & PORT_CSC)
 417                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 418                 if (temp & PORT_PEC)
 419                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 420                 if (temp & PORT_OCC)
 421                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 422
 423                 /* whoever resumes must GetPortStatus to complete it!! */
 424                 if ((temp & PORT_RESUME)
 425                                 && time_after (jiffies,
 426                                         ehci->reset_done [wIndex])) {
 427                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 428                         ehci->reset_done [wIndex] = 0;
 429
 430                         /* stop resume signaling */
 431                         temp = readl (&ehci->regs->port_status [wIndex]);
 432                         writel (temp & ~(PORT_RWC_BITS | PORT_RESUME),
 433                                 &ehci->regs->port_status [wIndex]);
 434                         retval = handshake (
 435                                         &ehci->regs->port_status [wIndex],
 436                                         PORT_RESUME, 0, 2000 /* 2msec */);
 437                         if (retval != 0) {
 438                                 ehci_err (ehci, "port %d resume error %d\n",
 439                                         wIndex + 1, retval);
 440                                 goto error;
 441                         }
 442                         temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 443                 }
 444
 445                 /* whoever resets must GetPortStatus to complete it!! */
 446                 if ((temp & PORT_RESET)
 447                                 && time_after (jiffies,
 448                                         ehci->reset_done [wIndex])) {
 449                         status |= 1 << USB_PORT_FEAT_C_RESET;
 450                         ehci->reset_done [wIndex] = 0;
 451
 452                         /* force reset to complete */
 453                         writel (temp & ~(PORT_RWC_BITS | PORT_RESET),
 454                                         &ehci->regs->port_status [wIndex]);
 455                         /* REVISIT:  some hardware needs 550+ usec to clear
 456                          * this bit; seems too long to spin routinely...
 457                          */
 458                         retval = handshake (
 459                                         &ehci->regs->port_status [wIndex],
 460                                         PORT_RESET, 0, 750);
 461                         if (retval != 0) {
 462                                 ehci_err (ehci, "port %d reset error %d\n",
 463                                         wIndex + 1, retval);
 464                                 goto error;
 465                         }
 466
 467                         /* see what we found out */
 468                         temp = check_reset_complete (ehci, wIndex,
 469                                 readl (&ehci->regs->port_status [wIndex]));
 470                 }
 471
 472                 // don't show wPortStatus if it's owned by a companion hc
 473                 if (!(temp & PORT_OWNER)) {
 474                         if (temp & PORT_CONNECT) {
 475                                 status |= 1 << USB_PORT_FEAT_CONNECTION;
 476                                 // status may be from integrated TT
 477                                 status |= ehci_port_speed(ehci, temp);
 478                         }
 479                         if (temp & PORT_PE)
 480                                 status |= 1 << USB_PORT_FEAT_ENABLE;
 481                         if (temp & (PORT_SUSPEND|PORT_RESUME))
 482                                 status |= 1 << USB_PORT_FEAT_SUSPEND;
 483                         if (temp & PORT_OC)
 484                                 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 485                         if (temp & PORT_RESET)
 486                                 status |= 1 << USB_PORT_FEAT_RESET;
 487                         if (temp & PORT_POWER)
 488                                 status |= 1 << USB_PORT_FEAT_POWER;
 489                 }
 490
 491 #ifndef EHCI_VERBOSE_DEBUG
 492         if (status & ~0xffff)   /* only if wPortChange is interesting */
 493 #endif
 494                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 495                 // we "know" this alignment is good, caller used kmalloc()...
 496                 *((__le32 *) buf) = cpu_to_le32 (status);
 497                 break;
 498         case SetHubFeature:
 499                 switch (wValue) {
 500                 case C_HUB_LOCAL_POWER:
 501                 case C_HUB_OVER_CURRENT:
 502                         /* no hub-wide feature/status flags */
 503                         break;
 504                 default:
 505                         goto error;
 506                 }
 507                 break;
 508         case SetPortFeature:
 509                 if (!wIndex || wIndex > ports)
 510                         goto error;
 511                 wIndex--;
 512                 temp = readl (&ehci->regs->port_status [wIndex]);
 513                 if (temp & PORT_OWNER)
 514                         break;
 515
 516                 temp &= ~PORT_RWC_BITS;
 517                 switch (wValue) {
 518                 case USB_PORT_FEAT_SUSPEND:
 519                         if (ehci->no_selective_suspend)
 520                                 break;
 521                         if ((temp & PORT_PE) == 0
 522                                         || (temp & PORT_RESET) != 0)
 523                                 goto error;
 524                         if (device_may_wakeup(&hcd->self.root_hub->dev))
 525                                 temp |= PORT_WAKE_BITS;
 526                         writel (temp | PORT_SUSPEND,
 527                                 &ehci->regs->port_status [wIndex]);
 528                         break;
 529                 case USB_PORT_FEAT_POWER:
 530                         if (HCS_PPC (ehci->hcs_params))
 531                                 writel (temp | PORT_POWER,
 532                                         &ehci->regs->port_status [wIndex]);
 533                         break;
 534                 case USB_PORT_FEAT_RESET:
 535                         if (temp & PORT_RESUME)
 536                                 goto error;
 537                         /* line status bits may report this as low speed,
 538                          * which can be fine if this root hub has a
 539                          * transaction translator built in.
 540                          */
 541                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 542                                         && !ehci_is_TDI(ehci)
 543                                         && PORT_USB11 (temp)) {
 544                                 ehci_dbg (ehci,
 545                                         "port %d low speed --> companion\n",
 546                                         wIndex + 1);
 547                                 temp |= PORT_OWNER;
 548                         } else {
 549                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 550                                 temp |= PORT_RESET;
 551                                 temp &= ~PORT_PE;
 552
 553                                 /*
 554                                  * caller must wait, then call GetPortStatus
 555                                  * usb 2.0 spec says 50 ms resets on root
 556                                  */
 557                                 ehci->reset_done [wIndex] = jiffies
 558                                                 + msecs_to_jiffies (50);
 559                         }
 560                         writel (temp, &ehci->regs->port_status [wIndex]);
 561                         break;
 562                 default:
 563                         goto error;
 564                 }
 565                 readl (&ehci->regs->command);   /* unblock posted writes */
 566                 break;
 567
 568         default:
 569 error:
 570                 /* "stall" on error */
 571                 retval = -EPIPE;
 572         }
 573         spin_unlock_irqrestore (&ehci->lock, flags);
 574         return retval;
 575 }