drivers/usb/host/ehci-hcd.c

   1 /*
   2  * Enhanced Host Controller Interface (EHCI) driver for USB.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * Copyright (c) 2000-2004 by David Brownell
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or (at your
  11  * option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/pci.h>
  25 #include <linux/dmapool.h>
  26 #include <linux/kernel.h>
  27 #include <linux/delay.h>
  28 #include <linux/ioport.h>
  29 #include <linux/sched.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/errno.h>
  32 #include <linux/init.h>
  33 #include <linux/timer.h>
  34 #include <linux/ktime.h>
  35 #include <linux/list.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/usb.h>
  38 #include <linux/usb/hcd.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/dma-mapping.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/slab.h>
  43 #include <linux/uaccess.h>
  44
  45 #include <asm/byteorder.h>
  46 #include <asm/io.h>
  47 #include <asm/irq.h>
  48 #include <asm/system.h>
  49 #include <asm/unaligned.h>
  50
  51 /*-------------------------------------------------------------------------*/
  52
  53 /*
  54  * EHCI hc_driver implementation ... experimental, incomplete.
  55  * Based on the final 1.0 register interface specification.
  56  *
  57  * USB 2.0 shows up in upcoming www.pcmcia.org technology.
  58  * First was PCMCIA, like ISA; then CardBus, which is PCI.
  59  * Next comes "CardBay", using USB 2.0 signals.
  60  *
  61  * Contains additional contributions by Brad Hards, Rory Bolt, and others.
  62  * Special thanks to Intel and VIA for providing host controllers to
  63  * test this driver on, and Cypress (including In-System Design) for
  64  * providing early devices for those host controllers to talk to!
  65  */
  66
  67 #define DRIVER_AUTHOR "David Brownell"
  68 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
  69
  70 static const char       hcd_name [] = "ehci_hcd";
  71
  72
  73 #undef VERBOSE_DEBUG
  74 #undef EHCI_URB_TRACE
  75
  76 #ifdef DEBUG
  77 #define EHCI_STATS
  78 #endif
  79
  80 /* magic numbers that can affect system performance */
  81 #define EHCI_TUNE_CERR          3       /* 0-3 qtd retries; 0 == don't stop */
  82 #define EHCI_TUNE_RL_HS         4       /* nak throttle; see 4.9 */
  83 #define EHCI_TUNE_RL_TT         0
  84 #define EHCI_TUNE_MULT_HS       1       /* 1-3 transactions/uframe; 4.10.3 */
  85 #define EHCI_TUNE_MULT_TT       1
  86 /*
  87  * Some drivers think it's safe to schedule isochronous transfers more than
  88  * 256 ms into the future (partly as a result of an old bug in the scheduling
  89  * code).  In an attempt to avoid trouble, we will use a minimum scheduling
  90  * length of 512 frames instead of 256.
  91  */
  92 #define EHCI_TUNE_FLS           1       /* (medium) 512-frame schedule */
  93
  94 #define EHCI_IAA_MSECS          10              /* arbitrary */
  95 #define EHCI_IO_JIFFIES         (HZ/10)         /* io watchdog > irq_thresh */
  96 #define EHCI_ASYNC_JIFFIES      (HZ/20)         /* async idle timeout */
  97 #define EHCI_SHRINK_JIFFIES     (DIV_ROUND_UP(HZ, 200) + 1)
  98                                                 /* 5-ms async qh unlink delay */
  99
 100 /* Initial IRQ latency:  faster than hw default */
 101 static int log2_irq_thresh = 0;         // 0 to 6
 102 module_param (log2_irq_thresh, int, S_IRUGO);
 103 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
 104
 105 /* initial park setting:  slower than hw default */
 106 static unsigned park = 0;
 107 module_param (park, uint, S_IRUGO);
 108 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
 109
 110 /* for flakey hardware, ignore overcurrent indicators */
 111 static int ignore_oc = 0;
 112 module_param (ignore_oc, bool, S_IRUGO);
 113 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
 114
 115 /* for link power management(LPM) feature */
 116 static unsigned int hird;
 117 module_param(hird, int, S_IRUGO);
 118 MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
 119
 120 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
 121
 122 /*-------------------------------------------------------------------------*/
 123
 124 #include "ehci.h"
 125 #include "ehci-dbg.c"
 126 #include "pci-quirks.h"
 127
 128 /*-------------------------------------------------------------------------*/
 129
 130 static void
 131 timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action)
 132 {
 133         /* Don't override timeouts which shrink or (later) disable
 134          * the async ring; just the I/O watchdog.  Note that if a
 135          * SHRINK were pending, OFF would never be requested.
 136          */
 137         if (timer_pending(&ehci->watchdog)
 138                         && ((BIT(TIMER_ASYNC_SHRINK) | BIT(TIMER_ASYNC_OFF))
 139                                 & ehci->actions))
 140                 return;
 141
 142         if (!test_and_set_bit(action, &ehci->actions)) {
 143                 unsigned long t;
 144
 145                 switch (action) {
 146                 case TIMER_IO_WATCHDOG:
 147                         if (!ehci->need_io_watchdog)
 148                                 return;
 149                         t = EHCI_IO_JIFFIES;
 150                         break;
 151                 case TIMER_ASYNC_OFF:
 152                         t = EHCI_ASYNC_JIFFIES;
 153                         break;
 154                 /* case TIMER_ASYNC_SHRINK: */
 155                 default:
 156                         t = EHCI_SHRINK_JIFFIES;
 157                         break;
 158                 }
 159                 mod_timer(&ehci->watchdog, t + jiffies);
 160         }
 161 }
 162
 163 /*-------------------------------------------------------------------------*/
 164
 165 /*
 166  * handshake - spin reading hc until handshake completes or fails
 167  * @ptr: address of hc register to be read
 168  * @mask: bits to look at in result of read
 169  * @done: value of those bits when handshake succeeds
 170  * @usec: timeout in microseconds
 171  *
 172  * Returns negative errno, or zero on success
 173  *
 174  * Success happens when the "mask" bits have the specified value (hardware
 175  * handshake done).  There are two failure modes:  "usec" have passed (major
 176  * hardware flakeout), or the register reads as all-ones (hardware removed).
 177  *
 178  * That last failure should_only happen in cases like physical cardbus eject
 179  * before driver shutdown. But it also seems to be caused by bugs in cardbus
 180  * bridge shutdown:  shutting down the bridge before the devices using it.
 181  */
 182 static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
 183                       u32 mask, u32 done, int usec)
 184 {
 185         u32     result;
 186
 187         do {
 188                 result = ehci_readl(ehci, ptr);
 189                 if (result == ~(u32)0)          /* card removed */
 190                         return -ENODEV;
 191                 result &= mask;
 192                 if (result == done)
 193                         return 0;
 194                 udelay (1);
 195                 usec--;
 196         } while (usec > 0);
 197         return -ETIMEDOUT;
 198 }
 199
 200 /* check TDI/ARC silicon is in host mode */
 201 static int tdi_in_host_mode (struct ehci_hcd *ehci)
 202 {
 203         u32 __iomem     *reg_ptr;
 204         u32             tmp;
 205
 206         reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
 207         tmp = ehci_readl(ehci, reg_ptr);
 208         return (tmp & 3) == USBMODE_CM_HC;
 209 }
 210
 211 /* force HC to halt state from unknown (EHCI spec section 2.3) */
 212 static int ehci_halt (struct ehci_hcd *ehci)
 213 {
 214         u32     temp = ehci_readl(ehci, &ehci->regs->status);
 215
 216         /* disable any irqs left enabled by previous code */
 217         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 218
 219         if (ehci_is_TDI(ehci) && tdi_in_host_mode(ehci) == 0) {
 220                 return 0;
 221         }
 222
 223         if ((temp & STS_HALT) != 0)
 224                 return 0;
 225
 226         temp = ehci_readl(ehci, &ehci->regs->command);
 227         temp &= ~CMD_RUN;
 228         ehci_writel(ehci, temp, &ehci->regs->command);
 229         return handshake (ehci, &ehci->regs->status,
 230                           STS_HALT, STS_HALT, 16 * 125);
 231 }
 232
 233 static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr,
 234                                        u32 mask, u32 done, int usec)
 235 {
 236         int error;
 237
 238         error = handshake(ehci, ptr, mask, done, usec);
 239         if (error) {
 240                 ehci_halt(ehci);
 241                 ehci->rh_state = EHCI_RH_HALTED;
 242                 ehci_err(ehci, "force halt; handshake %p %08x %08x -> %d\n",
 243                         ptr, mask, done, error);
 244         }
 245
 246         return error;
 247 }
 248
 249 /* put TDI/ARC silicon into EHCI mode */
 250 static void tdi_reset (struct ehci_hcd *ehci)
 251 {
 252         u32 __iomem     *reg_ptr;
 253         u32             tmp;
 254
 255         reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
 256         tmp = ehci_readl(ehci, reg_ptr);
 257         tmp |= USBMODE_CM_HC;
 258         /* The default byte access to MMR space is LE after
 259          * controller reset. Set the required endian mode
 260          * for transfer buffers to match the host microprocessor
 261          */
 262         if (ehci_big_endian_mmio(ehci))
 263                 tmp |= USBMODE_BE;
 264         ehci_writel(ehci, tmp, reg_ptr);
 265 }
 266
 267 /* reset a non-running (STS_HALT == 1) controller */
 268 static int ehci_reset (struct ehci_hcd *ehci)
 269 {
 270         int     retval;
 271         u32     command = ehci_readl(ehci, &ehci->regs->command);
 272
 273         /* If the EHCI debug controller is active, special care must be
 274          * taken before and after a host controller reset */
 275         if (ehci->debug && !dbgp_reset_prep())
 276                 ehci->debug = NULL;
 277
 278         command |= CMD_RESET;
 279         dbg_cmd (ehci, "reset", command);
 280         ehci_writel(ehci, command, &ehci->regs->command);
 281         ehci->rh_state = EHCI_RH_HALTED;
 282         ehci->next_statechange = jiffies;
 283         retval = handshake (ehci, &ehci->regs->command,
 284                             CMD_RESET, 0, 250 * 1000);
 285
 286         if (ehci->has_hostpc) {
 287                 ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
 288                         (u32 __iomem *)(((u8 *)ehci->regs) + USBMODE_EX));
 289                 ehci_writel(ehci, TXFIFO_DEFAULT,
 290                         (u32 __iomem *)(((u8 *)ehci->regs) + TXFILLTUNING));
 291         }
 292         if (retval)
 293                 return retval;
 294
 295         if (ehci_is_TDI(ehci))
 296                 tdi_reset (ehci);
 297
 298         if (ehci->debug)
 299                 dbgp_external_startup();
 300
 301         return retval;
 302 }
 303
 304 /* idle the controller (from running) */
 305 static void ehci_quiesce (struct ehci_hcd *ehci)
 306 {
 307         u32     temp;
 308
 309 #ifdef DEBUG
 310         if (ehci->rh_state != EHCI_RH_RUNNING)
 311                 BUG ();
 312 #endif
 313
 314         /* wait for any schedule enables/disables to take effect */
 315         temp = ehci_readl(ehci, &ehci->regs->command) << 10;
 316         temp &= STS_ASS | STS_PSS;
 317         if (handshake_on_error_set_halt(ehci, &ehci->regs->status,
 318                                         STS_ASS | STS_PSS, temp, 16 * 125))
 319                 return;
 320
 321         /* then disable anything that's still active */
 322         temp = ehci_readl(ehci, &ehci->regs->command);
 323         temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
 324         ehci_writel(ehci, temp, &ehci->regs->command);
 325
 326         /* hardware can take 16 microframes to turn off ... */
 327         handshake_on_error_set_halt(ehci, &ehci->regs->status,
 328                                     STS_ASS | STS_PSS, 0, 16 * 125);
 329 }
 330
 331 /*-------------------------------------------------------------------------*/
 332
 333 static void end_unlink_async(struct ehci_hcd *ehci);
 334 static void ehci_work(struct ehci_hcd *ehci);
 335
 336 #include "ehci-hub.c"
 337 #include "ehci-lpm.c"
 338 #include "ehci-mem.c"
 339 #include "ehci-q.c"
 340 #include "ehci-sched.c"
 341 #include "ehci-sysfs.c"
 342
 343 /*-------------------------------------------------------------------------*/
 344
 345 static void ehci_iaa_watchdog(unsigned long param)
 346 {
 347         struct ehci_hcd         *ehci = (struct ehci_hcd *) param;
 348         unsigned long           flags;
 349
 350         spin_lock_irqsave (&ehci->lock, flags);
 351
 352         /* Lost IAA irqs wedge things badly; seen first with a vt8235.
 353          * So we need this watchdog, but must protect it against both
 354          * (a) SMP races against real IAA firing and retriggering, and
 355          * (b) clean HC shutdown, when IAA watchdog was pending.
 356          */
 357         if (ehci->reclaim
 358                         && !timer_pending(&ehci->iaa_watchdog)
 359                         && ehci->rh_state == EHCI_RH_RUNNING) {
 360                 u32 cmd, status;
 361
 362                 /* If we get here, IAA is *REALLY* late.  It's barely
 363                  * conceivable that the system is so busy that CMD_IAAD
 364                  * is still legitimately set, so let's be sure it's
 365                  * clear before we read STS_IAA.  (The HC should clear
 366                  * CMD_IAAD when it sets STS_IAA.)
 367                  */
 368                 cmd = ehci_readl(ehci, &ehci->regs->command);
 369                 if (cmd & CMD_IAAD)
 370                         ehci_writel(ehci, cmd & ~CMD_IAAD,
 371                                         &ehci->regs->command);
 372
 373                 /* If IAA is set here it either legitimately triggered
 374                  * before we cleared IAAD above (but _way_ late, so we'll
 375                  * still count it as lost) ... or a silicon erratum:
 376                  * - VIA seems to set IAA without triggering the IRQ;
 377                  * - IAAD potentially cleared without setting IAA.
 378                  */
 379                 status = ehci_readl(ehci, &ehci->regs->status);
 380                 if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
 381                         COUNT (ehci->stats.lost_iaa);
 382                         ehci_writel(ehci, STS_IAA, &ehci->regs->status);
 383                 }
 384
 385                 ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n",
 386                                 status, cmd);
 387                 end_unlink_async(ehci);
 388         }
 389
 390         spin_unlock_irqrestore(&ehci->lock, flags);
 391 }
 392
 393 static void ehci_watchdog(unsigned long param)
 394 {
 395         struct ehci_hcd         *ehci = (struct ehci_hcd *) param;
 396         unsigned long           flags;
 397
 398         spin_lock_irqsave(&ehci->lock, flags);
 399
 400         /* stop async processing after it's idled a bit */
 401         if (test_bit (TIMER_ASYNC_OFF, &ehci->actions))
 402                 start_unlink_async (ehci, ehci->async);
 403
 404         /* ehci could run by timer, without IRQs ... */
 405         ehci_work (ehci);
 406
 407         spin_unlock_irqrestore (&ehci->lock, flags);
 408 }
 409
 410 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
 411  * The firmware seems to think that powering off is a wakeup event!
 412  * This routine turns off remote wakeup and everything else, on all ports.
 413  */
 414 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
 415 {
 416         int     port = HCS_N_PORTS(ehci->hcs_params);
 417
 418         while (port--)
 419                 ehci_writel(ehci, PORT_RWC_BITS,
 420                                 &ehci->regs->port_status[port]);
 421 }
 422
 423 /*
 424  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
 425  * Should be called with ehci->lock held.
 426  */
 427 static void ehci_silence_controller(struct ehci_hcd *ehci)
 428 {
 429         ehci_halt(ehci);
 430         ehci_turn_off_all_ports(ehci);
 431
 432         /* make BIOS/etc use companion controller during reboot */
 433         ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 434
 435         /* unblock posted writes */
 436         ehci_readl(ehci, &ehci->regs->configured_flag);
 437 }
 438
 439 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
 440  * This forcibly disables dma and IRQs, helping kexec and other cases
 441  * where the next system software may expect clean state.
 442  */
 443 static void ehci_shutdown(struct usb_hcd *hcd)
 444 {
 445         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 446
 447         del_timer_sync(&ehci->watchdog);
 448         del_timer_sync(&ehci->iaa_watchdog);
 449
 450         spin_lock_irq(&ehci->lock);
 451         ehci_silence_controller(ehci);
 452         spin_unlock_irq(&ehci->lock);
 453 }
 454
 455 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
 456 {
 457         unsigned port;
 458
 459         if (!HCS_PPC (ehci->hcs_params))
 460                 return;
 461
 462         ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
 463         for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
 464                 (void) ehci_hub_control(ehci_to_hcd(ehci),
 465                                 is_on ? SetPortFeature : ClearPortFeature,
 466                                 USB_PORT_FEAT_POWER,
 467                                 port--, NULL, 0);
 468         /* Flush those writes */
 469         ehci_readl(ehci, &ehci->regs->command);
 470         msleep(20);
 471 }
 472
 473 /*-------------------------------------------------------------------------*/
 474
 475 /*
 476  * ehci_work is called from some interrupts, timers, and so on.
 477  * it calls driver completion functions, after dropping ehci->lock.
 478  */
 479 static void ehci_work (struct ehci_hcd *ehci)
 480 {
 481         timer_action_done (ehci, TIMER_IO_WATCHDOG);
 482
 483         /* another CPU may drop ehci->lock during a schedule scan while
 484          * it reports urb completions.  this flag guards against bogus
 485          * attempts at re-entrant schedule scanning.
 486          */
 487         if (ehci->scanning)
 488                 return;
 489         ehci->scanning = 1;
 490         scan_async (ehci);
 491         if (ehci->next_uframe != -1)
 492                 scan_periodic (ehci);
 493         ehci->scanning = 0;
 494
 495         /* the IO watchdog guards against hardware or driver bugs that
 496          * misplace IRQs, and should let us run completely without IRQs.
 497          * such lossage has been observed on both VT6202 and VT8235.
 498          */
 499         if (ehci->rh_state == EHCI_RH_RUNNING &&
 500                         (ehci->async->qh_next.ptr != NULL ||
 501                          ehci->periodic_sched != 0))
 502                 timer_action (ehci, TIMER_IO_WATCHDOG);
 503 }
 504
 505 /*
 506  * Called when the ehci_hcd module is removed.
 507  */
 508 static void ehci_stop (struct usb_hcd *hcd)
 509 {
 510         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 511
 512         ehci_dbg (ehci, "stop\n");
 513
 514         /* no more interrupts ... */
 515         del_timer_sync (&ehci->watchdog);
 516         del_timer_sync(&ehci->iaa_watchdog);
 517
 518         spin_lock_irq(&ehci->lock);
 519         if (ehci->rh_state == EHCI_RH_RUNNING)
 520                 ehci_quiesce (ehci);
 521
 522         ehci_silence_controller(ehci);
 523         ehci_reset (ehci);
 524         spin_unlock_irq(&ehci->lock);
 525
 526         remove_sysfs_files(ehci);
 527         remove_debug_files (ehci);
 528
 529         /* root hub is shut down separately (first, when possible) */
 530         spin_lock_irq (&ehci->lock);
 531         if (ehci->async)
 532                 ehci_work (ehci);
 533         spin_unlock_irq (&ehci->lock);
 534         ehci_mem_cleanup (ehci);
 535
 536         if (ehci->amd_pll_fix == 1)
 537                 usb_amd_dev_put();
 538
 539 #ifdef  EHCI_STATS
 540         ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
 541                 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
 542                 ehci->stats.lost_iaa);
 543         ehci_dbg (ehci, "complete %ld unlink %ld\n",
 544                 ehci->stats.complete, ehci->stats.unlink);
 545 #endif
 546
 547         dbg_status (ehci, "ehci_stop completed",
 548                     ehci_readl(ehci, &ehci->regs->status));
 549 }
 550
 551 /* one-time init, only for memory state */
 552 static int ehci_init(struct usb_hcd *hcd)
 553 {
 554         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 555         u32                     temp;
 556         int                     retval;
 557         u32                     hcc_params;
 558         struct ehci_qh_hw       *hw;
 559
 560         spin_lock_init(&ehci->lock);
 561
 562         /*
 563          * keep io watchdog by default, those good HCDs could turn off it later
 564          */
 565         ehci->need_io_watchdog = 1;
 566         init_timer(&ehci->watchdog);
 567         ehci->watchdog.function = ehci_watchdog;
 568         ehci->watchdog.data = (unsigned long) ehci;
 569
 570         init_timer(&ehci->iaa_watchdog);
 571         ehci->iaa_watchdog.function = ehci_iaa_watchdog;
 572         ehci->iaa_watchdog.data = (unsigned long) ehci;
 573
 574         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 575
 576         /*
 577          * by default set standard 80% (== 100 usec/uframe) max periodic
 578          * bandwidth as required by USB 2.0
 579          */
 580         ehci->uframe_periodic_max = 100;
 581
 582         /*
 583          * hw default: 1K periodic list heads, one per frame.
 584          * periodic_size can shrink by USBCMD update if hcc_params allows.
 585          */
 586         ehci->periodic_size = DEFAULT_I_TDPS;
 587         INIT_LIST_HEAD(&ehci->cached_itd_list);
 588         INIT_LIST_HEAD(&ehci->cached_sitd_list);
 589
 590         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 591                 /* periodic schedule size can be smaller than default */
 592                 switch (EHCI_TUNE_FLS) {
 593                 case 0: ehci->periodic_size = 1024; break;
 594                 case 1: ehci->periodic_size = 512; break;
 595                 case 2: ehci->periodic_size = 256; break;
 596                 default:        BUG();
 597                 }
 598         }
 599         if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
 600                 return retval;
 601
 602         /* controllers may cache some of the periodic schedule ... */
 603         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
 604                 ehci->i_thresh = 2 + 8;
 605         else                                    // N microframes cached
 606                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
 607
 608         ehci->reclaim = NULL;
 609         ehci->next_uframe = -1;
 610         ehci->clock_frame = -1;
 611
 612         /*
 613          * dedicate a qh for the async ring head, since we couldn't unlink
 614          * a 'real' qh without stopping the async schedule [4.8].  use it
 615          * as the 'reclamation list head' too.
 616          * its dummy is used in hw_alt_next of many tds, to prevent the qh
 617          * from automatically advancing to the next td after short reads.
 618          */
 619         ehci->async->qh_next.qh = NULL;
 620         hw = ehci->async->hw;
 621         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
 622         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
 623 #if defined(CONFIG_PPC_PS3)
 624         hw->hw_info1 |= cpu_to_hc32(ehci, (1 << 7));    /* I = 1 */
 625 #endif
 626         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
 627         hw->hw_qtd_next = EHCI_LIST_END(ehci);
 628         ehci->async->qh_state = QH_STATE_LINKED;
 629         hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
 630
 631         /* clear interrupt enables, set irq latency */
 632         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
 633                 log2_irq_thresh = 0;
 634         temp = 1 << (16 + log2_irq_thresh);
 635         if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) {
 636                 ehci->has_ppcd = 1;
 637                 ehci_dbg(ehci, "enable per-port change event\n");
 638                 temp |= CMD_PPCEE;
 639         }
 640         if (HCC_CANPARK(hcc_params)) {
 641                 /* HW default park == 3, on hardware that supports it (like
 642                  * NVidia and ALI silicon), maximizes throughput on the async
 643                  * schedule by avoiding QH fetches between transfers.
 644                  *
 645                  * With fast usb storage devices and NForce2, "park" seems to
 646                  * make problems:  throughput reduction (!), data errors...
 647                  */
 648                 if (park) {
 649                         park = min(park, (unsigned) 3);
 650                         temp |= CMD_PARK;
 651                         temp |= park << 8;
 652                 }
 653                 ehci_dbg(ehci, "park %d\n", park);
 654         }
 655         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 656                 /* periodic schedule size can be smaller than default */
 657                 temp &= ~(3 << 2);
 658                 temp |= (EHCI_TUNE_FLS << 2);
 659         }
 660         if (HCC_LPM(hcc_params)) {
 661                 /* support link power management EHCI 1.1 addendum */
 662                 ehci_dbg(ehci, "support lpm\n");
 663                 ehci->has_lpm = 1;
 664                 if (hird > 0xf) {
 665                         ehci_dbg(ehci, "hird %d invalid, use default 0",
 666                         hird);
 667                         hird = 0;
 668                 }
 669                 temp |= hird << 24;
 670         }
 671         ehci->command = temp;
 672
 673         /* Accept arbitrarily long scatter-gather lists */
 674         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
 675                 hcd->self.sg_tablesize = ~0;
 676         return 0;
 677 }
 678
 679 /* start HC running; it's halted, ehci_init() has been run (once) */
 680 static int ehci_run (struct usb_hcd *hcd)
 681 {
 682         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 683         int                     retval;
 684         u32                     temp;
 685         u32                     hcc_params;
 686
 687         hcd->uses_new_polling = 1;
 688
 689         /* EHCI spec section 4.1 */
 690         /*
 691          * TDI driver does the ehci_reset in their reset callback.
 692          * Don't reset here, because configuration settings will
 693          * vanish.
 694          */
 695         if (!ehci_is_TDI(ehci) && (retval = ehci_reset(ehci)) != 0) {
 696                 ehci_mem_cleanup(ehci);
 697                 return retval;
 698         }
 699         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 700         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
 701
 702         /*
 703          * hcc_params controls whether ehci->regs->segment must (!!!)
 704          * be used; it constrains QH/ITD/SITD and QTD locations.
 705          * pci_pool consistent memory always uses segment zero.
 706          * streaming mappings for I/O buffers, like pci_map_single(),
 707          * can return segments above 4GB, if the device allows.
 708          *
 709          * NOTE:  the dma mask is visible through dma_supported(), so
 710          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 711          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 712          * host side drivers though.
 713          */
 714         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 715         if (HCC_64BIT_ADDR(hcc_params)) {
 716                 ehci_writel(ehci, 0, &ehci->regs->segment);
 717 #if 0
 718 // this is deeply broken on almost all architectures
 719                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
 720                         ehci_info(ehci, "enabled 64bit DMA\n");
 721 #endif
 722         }
 723
 724
 725         // Philips, Intel, and maybe others need CMD_RUN before the
 726         // root hub will detect new devices (why?); NEC doesn't
 727         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
 728         ehci->command |= CMD_RUN;
 729         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 730         dbg_cmd (ehci, "init", ehci->command);
 731
 732         /*
 733          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
 734          * are explicitly handed to companion controller(s), so no TT is
 735          * involved with the root hub.  (Except where one is integrated,
 736          * and there's no companion controller unless maybe for USB OTG.)
 737          *
 738          * Turning on the CF flag will transfer ownership of all ports
 739          * from the companions to the EHCI controller.  If any of the
 740          * companions are in the middle of a port reset at the time, it
 741          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
 742          * guarantees that no resets are in progress.  After we set CF,
 743          * a short delay lets the hardware catch up; new resets shouldn't
 744          * be started before the port switching actions could complete.
 745          */
 746         down_write(&ehci_cf_port_reset_rwsem);
 747         ehci->rh_state = EHCI_RH_RUNNING;
 748         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 749         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 750         msleep(5);
 751         up_write(&ehci_cf_port_reset_rwsem);
 752         ehci->last_periodic_enable = ktime_get_real();
 753
 754         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 755         ehci_info (ehci,
 756                 "USB %x.%x started, EHCI %x.%02x%s\n",
 757                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
 758                 temp >> 8, temp & 0xff,
 759                 ignore_oc ? ", overcurrent ignored" : "");
 760
 761         ehci_writel(ehci, INTR_MASK,
 762                     &ehci->regs->intr_enable); /* Turn On Interrupts */
 763
 764         /* GRR this is run-once init(), being done every time the HC starts.
 765          * So long as they're part of class devices, we can't do it init()
 766          * since the class device isn't created that early.
 767          */
 768         create_debug_files(ehci);
 769         create_sysfs_files(ehci);
 770
 771         return 0;
 772 }
 773
 774 static int __maybe_unused ehci_setup (struct usb_hcd *hcd)
 775 {
 776         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 777         int retval;
 778
 779         ehci->regs = (void __iomem *)ehci->caps +
 780             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 781         dbg_hcs_params(ehci, "reset");
 782         dbg_hcc_params(ehci, "reset");
 783
 784         /* cache this readonly data; minimize chip reads */
 785         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 786
 787         ehci->sbrn = HCD_USB2;
 788
 789         retval = ehci_halt(ehci);
 790         if (retval)
 791                 return retval;
 792
 793         /* data structure init */
 794         retval = ehci_init(hcd);
 795         if (retval)
 796                 return retval;
 797
 798         ehci_reset(ehci);
 799
 800         return 0;
 801 }
 802
 803 /*-------------------------------------------------------------------------*/
 804
 805 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 806 {
 807         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 808         u32                     status, masked_status, pcd_status = 0, cmd;
 809         int                     bh;
 810         unsigned long           flags;
 811
 812         /*
 813          * For threadirqs option we use spin_lock_irqsave() variant to prevent
 814          * deadlock with ehci hrtimer callback, because hrtimer callbacks run
 815          * in interrupt context even when threadirqs is specified. We can go
 816          * back to spin_lock() variant when hrtimer callbacks become threaded.
 817          */
 818         spin_lock_irqsave(&ehci->lock, flags);
 819
 820         status = ehci_readl(ehci, &ehci->regs->status);
 821
 822         /* e.g. cardbus physical eject */
 823         if (status == ~(u32) 0) {
 824                 ehci_dbg (ehci, "device removed\n");
 825                 goto dead;
 826         }
 827
 828         /*
 829          * We don't use STS_FLR, but some controllers don't like it to
 830          * remain on, so mask it out along with the other status bits.
 831          */
 832         masked_status = status & (INTR_MASK | STS_FLR);
 833
 834         /* Shared IRQ? */
 835         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
 836                 spin_unlock_irqrestore(&ehci->lock, flags);
 837                 return IRQ_NONE;
 838         }
 839
 840         /* clear (just) interrupts */
 841         ehci_writel(ehci, masked_status, &ehci->regs->status);
 842         cmd = ehci_readl(ehci, &ehci->regs->command);
 843         bh = 0;
 844
 845 #ifdef  VERBOSE_DEBUG
 846         /* unrequested/ignored: Frame List Rollover */
 847         dbg_status (ehci, "irq", status);
 848 #endif
 849
 850         /* INT, ERR, and IAA interrupt rates can be throttled */
 851
 852         /* normal [4.15.1.2] or error [4.15.1.1] completion */
 853         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
 854                 if (likely ((status & STS_ERR) == 0))
 855                         COUNT (ehci->stats.normal);
 856                 else
 857                         COUNT (ehci->stats.error);
 858                 bh = 1;
 859         }
 860
 861         /* complete the unlinking of some qh [4.15.2.3] */
 862         if (status & STS_IAA) {
 863                 /* guard against (alleged) silicon errata */
 864                 if (cmd & CMD_IAAD) {
 865                         ehci_writel(ehci, cmd & ~CMD_IAAD,
 866                                         &ehci->regs->command);
 867                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
 868                 }
 869                 if (ehci->reclaim) {
 870                         COUNT(ehci->stats.reclaim);
 871                         end_unlink_async(ehci);
 872                 } else
 873                         ehci_dbg(ehci, "IAA with nothing to reclaim?\n");
 874         }
 875
 876         /* remote wakeup [4.3.1] */
 877         if (status & STS_PCD) {
 878                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
 879                 u32             ppcd = 0;
 880
 881                 /* kick root hub later */
 882                 pcd_status = status;
 883
 884                 /* resume root hub? */
 885                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
 886                         usb_hcd_resume_root_hub(hcd);
 887
 888                 /* get per-port change detect bits */
 889                 if (ehci->has_ppcd)
 890                         ppcd = status >> 16;
 891
 892                 while (i--) {
 893                         int pstatus;
 894
 895                         /* leverage per-port change bits feature */
 896                         if (ehci->has_ppcd && !(ppcd & (1 << i)))
 897                                 continue;
 898                         pstatus = ehci_readl(ehci,
 899                                          &ehci->regs->port_status[i]);
 900
 901                         if (pstatus & PORT_OWNER)
 902                                 continue;
 903                         if (!(test_bit(i, &ehci->suspended_ports) &&
 904                                         ((pstatus & PORT_RESUME) ||
 905                                                 !(pstatus & PORT_SUSPEND)) &&
 906                                         (pstatus & PORT_PE) &&
 907                                         ehci->reset_done[i] == 0))
 908                                 continue;
 909
 910                         /* start 20 msec resume signaling from this port,
 911                          * and make khubd collect PORT_STAT_C_SUSPEND to
 912                          * stop that signaling.  Use 5 ms extra for safety,
 913                          * like usb_port_resume() does.
 914                          */
 915                         ehci->reset_done[i] = jiffies + msecs_to_jiffies(25);
 916                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
 917                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
 918                 }
 919         }
 920
 921         /* PCI errors [4.15.2.4] */
 922         if (unlikely ((status & STS_FATAL) != 0)) {
 923                 ehci_err(ehci, "fatal error\n");
 924                 dbg_cmd(ehci, "fatal", cmd);
 925                 dbg_status(ehci, "fatal", status);
 926                 ehci_halt(ehci);
 927 dead:
 928                 ehci_reset(ehci);
 929                 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 930                 usb_hc_died(hcd);
 931                 /* generic layer kills/unlinks all urbs, then
 932                  * uses ehci_stop to clean up the rest
 933                  */
 934                 bh = 1;
 935         }
 936
 937         if (bh)
 938                 ehci_work (ehci);
 939         spin_unlock_irqrestore(&ehci->lock, flags);
 940         if (pcd_status)
 941                 usb_hcd_poll_rh_status(hcd);
 942         return IRQ_HANDLED;
 943 }
 944
 945 /*-------------------------------------------------------------------------*/
 946
 947 /*
 948  * non-error returns are a promise to giveback() the urb later
 949  * we drop ownership so next owner (or urb unlink) can get it
 950  *
 951  * urb + dev is in hcd.self.controller.urb_list
 952  * we're queueing TDs onto software and hardware lists
 953  *
 954  * hcd-specific init for hcpriv hasn't been done yet
 955  *
 956  * NOTE:  control, bulk, and interrupt share the same code to append TDs
 957  * to a (possibly active) QH, and the same QH scanning code.
 958  */
 959 static int ehci_urb_enqueue (
 960         struct usb_hcd  *hcd,
 961         struct urb      *urb,
 962         gfp_t           mem_flags
 963 ) {
 964         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 965         struct list_head        qtd_list;
 966
 967         INIT_LIST_HEAD (&qtd_list);
 968
 969         switch (usb_pipetype (urb->pipe)) {
 970         case PIPE_CONTROL:
 971                 /* qh_completions() code doesn't handle all the fault cases
 972                  * in multi-TD control transfers.  Even 1KB is rare anyway.
 973                  */
 974                 if (urb->transfer_buffer_length > (16 * 1024))
 975                         return -EMSGSIZE;
 976                 /* FALLTHROUGH */
 977         /* case PIPE_BULK: */
 978         default:
 979                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 980                         return -ENOMEM;
 981                 return submit_async(ehci, urb, &qtd_list, mem_flags);
 982
 983         case PIPE_INTERRUPT:
 984                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 985                         return -ENOMEM;
 986                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
 987
 988         case PIPE_ISOCHRONOUS:
 989                 if (urb->dev->speed == USB_SPEED_HIGH)
 990                         return itd_submit (ehci, urb, mem_flags);
 991                 else
 992                         return sitd_submit (ehci, urb, mem_flags);
 993         }
 994 }
 995
 996 static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 997 {
 998         /* failfast */
 999         if (ehci->rh_state != EHCI_RH_RUNNING && ehci->reclaim)
1000                 end_unlink_async(ehci);
1001
1002         /* If the QH isn't linked then there's nothing we can do
1003          * unless we were called during a giveback, in which case
1004          * qh_completions() has to deal with it.
1005          */
1006         if (qh->qh_state != QH_STATE_LINKED) {
1007                 if (qh->qh_state == QH_STATE_COMPLETING)
1008                         qh->needs_rescan = 1;
1009                 return;
1010         }
1011
1012         /* defer till later if busy */
1013         if (ehci->reclaim) {
1014                 struct ehci_qh          *last;
1015
1016                 for (last = ehci->reclaim;
1017                                 last->reclaim;
1018                                 last = last->reclaim)
1019                         continue;
1020                 qh->qh_state = QH_STATE_UNLINK_WAIT;
1021                 last->reclaim = qh;
1022
1023         /* start IAA cycle */
1024         } else
1025                 start_unlink_async (ehci, qh);
1026 }
1027
1028 /* remove from hardware lists
1029  * completions normally happen asynchronously
1030  */
1031
1032 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1033 {
1034         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1035         struct ehci_qh          *qh;
1036         unsigned long           flags;
1037         int                     rc;
1038
1039         spin_lock_irqsave (&ehci->lock, flags);
1040         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1041         if (rc)
1042                 goto done;
1043
1044         switch (usb_pipetype (urb->pipe)) {
1045         // case PIPE_CONTROL:
1046         // case PIPE_BULK:
1047         default:
1048                 qh = (struct ehci_qh *) urb->hcpriv;
1049                 if (!qh)
1050                         break;
1051                 switch (qh->qh_state) {
1052                 case QH_STATE_LINKED:
1053                 case QH_STATE_COMPLETING:
1054                         unlink_async(ehci, qh);
1055                         break;
1056                 case QH_STATE_UNLINK:
1057                 case QH_STATE_UNLINK_WAIT:
1058                         /* already started */
1059                         break;
1060                 case QH_STATE_IDLE:
1061                         /* QH might be waiting for a Clear-TT-Buffer */
1062                         qh_completions(ehci, qh);
1063                         break;
1064                 }
1065                 break;
1066
1067         case PIPE_INTERRUPT:
1068                 qh = (struct ehci_qh *) urb->hcpriv;
1069                 if (!qh)
1070                         break;
1071                 switch (qh->qh_state) {
1072                 case QH_STATE_LINKED:
1073                 case QH_STATE_COMPLETING:
1074                         intr_deschedule (ehci, qh);
1075                         break;
1076                 case QH_STATE_IDLE:
1077                         qh_completions (ehci, qh);
1078                         break;
1079                 default:
1080                         ehci_dbg (ehci, "bogus qh %p state %d\n",
1081                                         qh, qh->qh_state);
1082                         goto done;
1083                 }
1084                 break;
1085
1086         case PIPE_ISOCHRONOUS:
1087                 // itd or sitd ...
1088
1089                 // wait till next completion, do it then.
1090                 // completion irqs can wait up to 1024 msec,
1091                 break;
1092         }
1093 done:
1094         spin_unlock_irqrestore (&ehci->lock, flags);
1095         return rc;
1096 }
1097
1098 /*-------------------------------------------------------------------------*/
1099
1100 // bulk qh holds the data toggle
1101
1102 static void
1103 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1104 {
1105         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1106         unsigned long           flags;
1107         struct ehci_qh          *qh, *tmp;
1108
1109         /* ASSERT:  any requests/urbs are being unlinked */
1110         /* ASSERT:  nobody can be submitting urbs for this any more */
1111
1112 rescan:
1113         spin_lock_irqsave (&ehci->lock, flags);
1114         qh = ep->hcpriv;
1115         if (!qh)
1116                 goto done;
1117
1118         /* endpoints can be iso streams.  for now, we don't
1119          * accelerate iso completions ... so spin a while.
1120          */
1121         if (qh->hw == NULL) {
1122                 ehci_vdbg (ehci, "iso delay\n");
1123                 goto idle_timeout;
1124         }
1125
1126         if (ehci->rh_state != EHCI_RH_RUNNING)
1127                 qh->qh_state = QH_STATE_IDLE;
1128         switch (qh->qh_state) {
1129         case QH_STATE_LINKED:
1130         case QH_STATE_COMPLETING:
1131                 for (tmp = ehci->async->qh_next.qh;
1132                                 tmp && tmp != qh;
1133                                 tmp = tmp->qh_next.qh)
1134                         continue;
1135                 /* periodic qh self-unlinks on empty, and a COMPLETING qh
1136                  * may already be unlinked.
1137                  */
1138                 if (tmp)
1139                         unlink_async(ehci, qh);
1140                 /* FALL THROUGH */
1141         case QH_STATE_UNLINK:           /* wait for hw to finish? */
1142         case QH_STATE_UNLINK_WAIT:
1143 idle_timeout:
1144                 spin_unlock_irqrestore (&ehci->lock, flags);
1145                 schedule_timeout_uninterruptible(1);
1146                 goto rescan;
1147         case QH_STATE_IDLE:             /* fully unlinked */
1148                 if (qh->clearing_tt)
1149                         goto idle_timeout;
1150                 if (list_empty (&qh->qtd_list)) {
1151                         qh_put (qh);
1152                         break;
1153                 }
1154                 /* else FALL THROUGH */
1155         default:
1156                 /* caller was supposed to have unlinked any requests;
1157                  * that's not our job.  just leak this memory.
1158                  */
1159                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1160                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1161                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1162                 break;
1163         }
1164         ep->hcpriv = NULL;
1165 done:
1166         spin_unlock_irqrestore (&ehci->lock, flags);
1167 }
1168
1169 static void
1170 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1171 {
1172         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1173         struct ehci_qh          *qh;
1174         int                     eptype = usb_endpoint_type(&ep->desc);
1175         int                     epnum = usb_endpoint_num(&ep->desc);
1176         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1177         unsigned long           flags;
1178
1179         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1180                 return;
1181
1182         spin_lock_irqsave(&ehci->lock, flags);
1183         qh = ep->hcpriv;
1184
1185         /* For Bulk and Interrupt endpoints we maintain the toggle state
1186          * in the hardware; the toggle bits in udev aren't used at all.
1187          * When an endpoint is reset by usb_clear_halt() we must reset
1188          * the toggle bit in the QH.
1189          */
1190         if (qh) {
1191                 usb_settoggle(qh->dev, epnum, is_out, 0);
1192                 if (!list_empty(&qh->qtd_list)) {
1193                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1194                 } else if (qh->qh_state == QH_STATE_LINKED ||
1195                                 qh->qh_state == QH_STATE_COMPLETING) {
1196
1197                         /* The toggle value in the QH can't be updated
1198                          * while the QH is active.  Unlink it now;
1199                          * re-linking will call qh_refresh().
1200                          */
1201                         if (eptype == USB_ENDPOINT_XFER_BULK)
1202                                 unlink_async(ehci, qh);
1203                         else
1204                                 intr_deschedule(ehci, qh);
1205                 }
1206         }
1207         spin_unlock_irqrestore(&ehci->lock, flags);
1208 }
1209
1210 static int ehci_get_frame (struct usb_hcd *hcd)
1211 {
1212         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1213         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1214 }
1215
1216 /*-------------------------------------------------------------------------*/
1217
1218 MODULE_DESCRIPTION(DRIVER_DESC);
1219 MODULE_AUTHOR (DRIVER_AUTHOR);
1220 MODULE_LICENSE ("GPL");
1221
1222 #ifdef CONFIG_PCI
1223 #include "ehci-pci.c"
1224 #define PCI_DRIVER              ehci_pci_driver
1225 #endif
1226
1227 #ifdef CONFIG_USB_EHCI_FSL
1228 #include "ehci-fsl.c"
1229 #define PLATFORM_DRIVER         ehci_fsl_driver
1230 #endif
1231
1232 #ifdef CONFIG_USB_EHCI_MXC
1233 #include "ehci-mxc.c"
1234 #define PLATFORM_DRIVER         ehci_mxc_driver
1235 #endif
1236
1237 #ifdef CONFIG_USB_EHCI_SH
1238 #include "ehci-sh.c"
1239 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1240 #endif
1241
1242 #ifdef CONFIG_MIPS_ALCHEMY
1243 #include "ehci-au1xxx.c"
1244 #define PLATFORM_DRIVER         ehci_hcd_au1xxx_driver
1245 #endif
1246
1247 #ifdef CONFIG_USB_EHCI_HCD_OMAP
1248 #include "ehci-omap.c"
1249 #define        PLATFORM_DRIVER         ehci_hcd_omap_driver
1250 #endif
1251
1252 #ifdef CONFIG_PPC_PS3
1253 #include "ehci-ps3.c"
1254 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1255 #endif
1256
1257 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1258 #include "ehci-ppc-of.c"
1259 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1260 #endif
1261
1262 #ifdef CONFIG_XPS_USB_HCD_XILINX
1263 #include "ehci-xilinx-of.c"
1264 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1265 #endif
1266
1267 #ifdef CONFIG_PLAT_ORION
1268 #include "ehci-orion.c"
1269 #define PLATFORM_DRIVER         ehci_orion_driver
1270 #endif
1271
1272 #ifdef CONFIG_ARCH_IXP4XX
1273 #include "ehci-ixp4xx.c"
1274 #define PLATFORM_DRIVER         ixp4xx_ehci_driver
1275 #endif
1276
1277 #ifdef CONFIG_USB_W90X900_EHCI
1278 #include "ehci-w90x900.c"
1279 #define PLATFORM_DRIVER         ehci_hcd_w90x900_driver
1280 #endif
1281
1282 #ifdef CONFIG_ARCH_AT91
1283 #include "ehci-atmel.c"
1284 #define PLATFORM_DRIVER         ehci_atmel_driver
1285 #endif
1286
1287 #ifdef CONFIG_USB_OCTEON_EHCI
1288 #include "ehci-octeon.c"
1289 #define PLATFORM_DRIVER         ehci_octeon_driver
1290 #endif
1291
1292 #ifdef CONFIG_USB_CNS3XXX_EHCI
1293 #include "ehci-cns3xxx.c"
1294 #define PLATFORM_DRIVER         cns3xxx_ehci_driver
1295 #endif
1296
1297 #ifdef CONFIG_ARCH_VT8500
1298 #include "ehci-vt8500.c"
1299 #define PLATFORM_DRIVER         vt8500_ehci_driver
1300 #endif
1301
1302 #ifdef CONFIG_PLAT_SPEAR
1303 #include "ehci-spear.c"
1304 #define PLATFORM_DRIVER         spear_ehci_hcd_driver
1305 #endif
1306
1307 #ifdef CONFIG_USB_EHCI_MSM
1308 #include "ehci-msm.c"
1309 #define PLATFORM_DRIVER         ehci_msm_driver
1310 #endif
1311
1312 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1313 #include "ehci-pmcmsp.c"
1314 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1315 #endif
1316
1317 #ifdef CONFIG_USB_EHCI_TEGRA
1318 #include "ehci-tegra.c"
1319 #define PLATFORM_DRIVER         tegra_ehci_driver
1320 #endif
1321
1322 #ifdef CONFIG_USB_EHCI_S5P
1323 #include "ehci-s5p.c"
1324 #define PLATFORM_DRIVER         s5p_ehci_driver
1325 #endif
1326
1327 #ifdef CONFIG_USB_EHCI_ATH79
1328 #include "ehci-ath79.c"
1329 #define PLATFORM_DRIVER         ehci_ath79_driver
1330 #endif
1331
1332 #ifdef CONFIG_SPARC_LEON
1333 #include "ehci-grlib.c"
1334 #define PLATFORM_DRIVER         ehci_grlib_driver
1335 #endif
1336
1337 #ifdef CONFIG_USB_PXA168_EHCI
1338 #include "ehci-pxa168.c"
1339 #define PLATFORM_DRIVER         ehci_pxa168_driver
1340 #endif
1341
1342 #ifdef CONFIG_NLM_XLR
1343 #include "ehci-xls.c"
1344 #define PLATFORM_DRIVER         ehci_xls_driver
1345 #endif
1346
1347 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
1348     !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
1349     !defined(XILINX_OF_PLATFORM_DRIVER)
1350 #error "missing bus glue for ehci-hcd"
1351 #endif
1352
1353 static int __init ehci_hcd_init(void)
1354 {
1355         int retval = 0;
1356
1357         if (usb_disabled())
1358                 return -ENODEV;
1359
1360         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1361         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1362         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1363                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1364                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1365                                 " before uhci_hcd and ohci_hcd, not after\n");
1366
1367         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1368                  hcd_name,
1369                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1370                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1371
1372 #ifdef DEBUG
1373         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1374         if (!ehci_debug_root) {
1375                 retval = -ENOENT;
1376                 goto err_debug;
1377         }
1378 #endif
1379
1380 #ifdef PLATFORM_DRIVER
1381         retval = platform_driver_register(&PLATFORM_DRIVER);
1382         if (retval < 0)
1383                 goto clean0;
1384 #endif
1385
1386 #ifdef PCI_DRIVER
1387         retval = pci_register_driver(&PCI_DRIVER);
1388         if (retval < 0)
1389                 goto clean1;
1390 #endif
1391
1392 #ifdef PS3_SYSTEM_BUS_DRIVER
1393         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1394         if (retval < 0)
1395                 goto clean2;
1396 #endif
1397
1398 #ifdef OF_PLATFORM_DRIVER
1399         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1400         if (retval < 0)
1401                 goto clean3;
1402 #endif
1403
1404 #ifdef XILINX_OF_PLATFORM_DRIVER
1405         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1406         if (retval < 0)
1407                 goto clean4;
1408 #endif
1409         return retval;
1410
1411 #ifdef XILINX_OF_PLATFORM_DRIVER
1412         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1413 clean4:
1414 #endif
1415 #ifdef OF_PLATFORM_DRIVER
1416         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1417 clean3:
1418 #endif
1419 #ifdef PS3_SYSTEM_BUS_DRIVER
1420         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1421 clean2:
1422 #endif
1423 #ifdef PCI_DRIVER
1424         pci_unregister_driver(&PCI_DRIVER);
1425 clean1:
1426 #endif
1427 #ifdef PLATFORM_DRIVER
1428         platform_driver_unregister(&PLATFORM_DRIVER);
1429 clean0:
1430 #endif
1431 #ifdef DEBUG
1432         debugfs_remove(ehci_debug_root);
1433         ehci_debug_root = NULL;
1434 err_debug:
1435 #endif
1436         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1437         return retval;
1438 }
1439 module_init(ehci_hcd_init);
1440
1441 static void __exit ehci_hcd_cleanup(void)
1442 {
1443 #ifdef XILINX_OF_PLATFORM_DRIVER
1444         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1445 #endif
1446 #ifdef OF_PLATFORM_DRIVER
1447         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1448 #endif
1449 #ifdef PLATFORM_DRIVER
1450         platform_driver_unregister(&PLATFORM_DRIVER);
1451 #endif
1452 #ifdef PCI_DRIVER
1453         pci_unregister_driver(&PCI_DRIVER);
1454 #endif
1455 #ifdef PS3_SYSTEM_BUS_DRIVER
1456         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1457 #endif
1458 #ifdef DEBUG
1459         debugfs_remove(ehci_debug_root);
1460 #endif
1461         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1462 }
1463 module_exit(ehci_hcd_cleanup);
1464