Pileus Git - ~andy/linux/blob - 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/hrtimer.h>
  34 #include <linux/list.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/hcd.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/debugfs.h>
  41 #include <linux/slab.h>
  42
  43 #include <asm/byteorder.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/unaligned.h>
  47
  48 #if defined(CONFIG_PPC_PS3)
  49 #include <asm/firmware.h>
  50 #endif
  51
  52 /*-------------------------------------------------------------------------*/
  53
  54 /*
  55  * EHCI hc_driver implementation ... experimental, incomplete.
  56  * Based on the final 1.0 register interface specification.
  57  *
  58  * USB 2.0 shows up in upcoming www.pcmcia.org technology.
  59  * First was PCMCIA, like ISA; then CardBus, which is PCI.
  60  * Next comes "CardBay", using USB 2.0 signals.
  61  *
  62  * Contains additional contributions by Brad Hards, Rory Bolt, and others.
  63  * Special thanks to Intel and VIA for providing host controllers to
  64  * test this driver on, and Cypress (including In-System Design) for
  65  * providing early devices for those host controllers to talk to!
  66  */
  67
  68 #define DRIVER_AUTHOR "David Brownell"
  69 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
  70
  71 static const char       hcd_name [] = "ehci_hcd";
  72
  73
  74 #undef VERBOSE_DEBUG
  75 #undef EHCI_URB_TRACE
  76
  77 /* magic numbers that can affect system performance */
  78 #define EHCI_TUNE_CERR          3       /* 0-3 qtd retries; 0 == don't stop */
  79 #define EHCI_TUNE_RL_HS         4       /* nak throttle; see 4.9 */
  80 #define EHCI_TUNE_RL_TT         0
  81 #define EHCI_TUNE_MULT_HS       1       /* 1-3 transactions/uframe; 4.10.3 */
  82 #define EHCI_TUNE_MULT_TT       1
  83 /*
  84  * Some drivers think it's safe to schedule isochronous transfers more than
  85  * 256 ms into the future (partly as a result of an old bug in the scheduling
  86  * code).  In an attempt to avoid trouble, we will use a minimum scheduling
  87  * length of 512 frames instead of 256.
  88  */
  89 #define EHCI_TUNE_FLS           1       /* (medium) 512-frame schedule */
  90
  91 /* Initial IRQ latency:  faster than hw default */
  92 static int log2_irq_thresh = 0;         // 0 to 6
  93 module_param (log2_irq_thresh, int, S_IRUGO);
  94 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
  95
  96 /* initial park setting:  slower than hw default */
  97 static unsigned park = 0;
  98 module_param (park, uint, S_IRUGO);
  99 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
 100
 101 /* for flakey hardware, ignore overcurrent indicators */
 102 static bool ignore_oc = 0;
 103 module_param (ignore_oc, bool, S_IRUGO);
 104 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
 105
 106 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
 107
 108 /*-------------------------------------------------------------------------*/
 109
 110 #include "ehci.h"
 111 #include "pci-quirks.h"
 112
 113 static void compute_tt_budget(u8 budget_table[EHCI_BANDWIDTH_SIZE],
 114                 struct ehci_tt *tt);
 115
 116 /*
 117  * The MosChip MCS9990 controller updates its microframe counter
 118  * a little before the frame counter, and occasionally we will read
 119  * the invalid intermediate value.  Avoid problems by checking the
 120  * microframe number (the low-order 3 bits); if they are 0 then
 121  * re-read the register to get the correct value.
 122  */
 123 static unsigned ehci_moschip_read_frame_index(struct ehci_hcd *ehci)
 124 {
 125         unsigned uf;
 126
 127         uf = ehci_readl(ehci, &ehci->regs->frame_index);
 128         if (unlikely((uf & 7) == 0))
 129                 uf = ehci_readl(ehci, &ehci->regs->frame_index);
 130         return uf;
 131 }
 132
 133 static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci)
 134 {
 135         if (ehci->frame_index_bug)
 136                 return ehci_moschip_read_frame_index(ehci);
 137         return ehci_readl(ehci, &ehci->regs->frame_index);
 138 }
 139
 140 #include "ehci-dbg.c"
 141
 142 /*-------------------------------------------------------------------------*/
 143
 144 /*
 145  * ehci_handshake - spin reading hc until handshake completes or fails
 146  * @ptr: address of hc register to be read
 147  * @mask: bits to look at in result of read
 148  * @done: value of those bits when handshake succeeds
 149  * @usec: timeout in microseconds
 150  *
 151  * Returns negative errno, or zero on success
 152  *
 153  * Success happens when the "mask" bits have the specified value (hardware
 154  * handshake done).  There are two failure modes:  "usec" have passed (major
 155  * hardware flakeout), or the register reads as all-ones (hardware removed).
 156  *
 157  * That last failure should_only happen in cases like physical cardbus eject
 158  * before driver shutdown. But it also seems to be caused by bugs in cardbus
 159  * bridge shutdown:  shutting down the bridge before the devices using it.
 160  */
 161 int ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
 162                    u32 mask, u32 done, int usec)
 163 {
 164         u32     result;
 165
 166         do {
 167                 result = ehci_readl(ehci, ptr);
 168                 if (result == ~(u32)0)          /* card removed */
 169                         return -ENODEV;
 170                 result &= mask;
 171                 if (result == done)
 172                         return 0;
 173                 udelay (1);
 174                 usec--;
 175         } while (usec > 0);
 176         return -ETIMEDOUT;
 177 }
 178 EXPORT_SYMBOL_GPL(ehci_handshake);
 179
 180 /* check TDI/ARC silicon is in host mode */
 181 static int tdi_in_host_mode (struct ehci_hcd *ehci)
 182 {
 183         u32             tmp;
 184
 185         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
 186         return (tmp & 3) == USBMODE_CM_HC;
 187 }
 188
 189 /*
 190  * Force HC to halt state from unknown (EHCI spec section 2.3).
 191  * Must be called with interrupts enabled and the lock not held.
 192  */
 193 static int ehci_halt (struct ehci_hcd *ehci)
 194 {
 195         u32     temp;
 196
 197         spin_lock_irq(&ehci->lock);
 198
 199         /* disable any irqs left enabled by previous code */
 200         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 201
 202         if (ehci_is_TDI(ehci) && !tdi_in_host_mode(ehci)) {
 203                 spin_unlock_irq(&ehci->lock);
 204                 return 0;
 205         }
 206
 207         /*
 208          * This routine gets called during probe before ehci->command
 209          * has been initialized, so we can't rely on its value.
 210          */
 211         ehci->command &= ~CMD_RUN;
 212         temp = ehci_readl(ehci, &ehci->regs->command);
 213         temp &= ~(CMD_RUN | CMD_IAAD);
 214         ehci_writel(ehci, temp, &ehci->regs->command);
 215
 216         spin_unlock_irq(&ehci->lock);
 217         synchronize_irq(ehci_to_hcd(ehci)->irq);
 218
 219         return ehci_handshake(ehci, &ehci->regs->status,
 220                           STS_HALT, STS_HALT, 16 * 125);
 221 }
 222
 223 /* put TDI/ARC silicon into EHCI mode */
 224 static void tdi_reset (struct ehci_hcd *ehci)
 225 {
 226         u32             tmp;
 227
 228         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
 229         tmp |= USBMODE_CM_HC;
 230         /* The default byte access to MMR space is LE after
 231          * controller reset. Set the required endian mode
 232          * for transfer buffers to match the host microprocessor
 233          */
 234         if (ehci_big_endian_mmio(ehci))
 235                 tmp |= USBMODE_BE;
 236         ehci_writel(ehci, tmp, &ehci->regs->usbmode);
 237 }
 238
 239 /*
 240  * Reset a non-running (STS_HALT == 1) controller.
 241  * Must be called with interrupts enabled and the lock not held.
 242  */
 243 static int ehci_reset (struct ehci_hcd *ehci)
 244 {
 245         int     retval;
 246         u32     command = ehci_readl(ehci, &ehci->regs->command);
 247
 248         /* If the EHCI debug controller is active, special care must be
 249          * taken before and after a host controller reset */
 250         if (ehci->debug && !dbgp_reset_prep(ehci_to_hcd(ehci)))
 251                 ehci->debug = NULL;
 252
 253         command |= CMD_RESET;
 254         dbg_cmd (ehci, "reset", command);
 255         ehci_writel(ehci, command, &ehci->regs->command);
 256         ehci->rh_state = EHCI_RH_HALTED;
 257         ehci->next_statechange = jiffies;
 258         retval = ehci_handshake(ehci, &ehci->regs->command,
 259                             CMD_RESET, 0, 250 * 1000);
 260
 261         if (ehci->has_hostpc) {
 262                 ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
 263                                 &ehci->regs->usbmode_ex);
 264                 ehci_writel(ehci, TXFIFO_DEFAULT, &ehci->regs->txfill_tuning);
 265         }
 266         if (retval)
 267                 return retval;
 268
 269         if (ehci_is_TDI(ehci))
 270                 tdi_reset (ehci);
 271
 272         if (ehci->debug)
 273                 dbgp_external_startup(ehci_to_hcd(ehci));
 274
 275         ehci->port_c_suspend = ehci->suspended_ports =
 276                         ehci->resuming_ports = 0;
 277         return retval;
 278 }
 279
 280 /*
 281  * Idle the controller (turn off the schedules).
 282  * Must be called with interrupts enabled and the lock not held.
 283  */
 284 static void ehci_quiesce (struct ehci_hcd *ehci)
 285 {
 286         u32     temp;
 287
 288         if (ehci->rh_state != EHCI_RH_RUNNING)
 289                 return;
 290
 291         /* wait for any schedule enables/disables to take effect */
 292         temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
 293         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp,
 294                         16 * 125);
 295
 296         /* then disable anything that's still active */
 297         spin_lock_irq(&ehci->lock);
 298         ehci->command &= ~(CMD_ASE | CMD_PSE);
 299         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 300         spin_unlock_irq(&ehci->lock);
 301
 302         /* hardware can take 16 microframes to turn off ... */
 303         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0,
 304                         16 * 125);
 305 }
 306
 307 /*-------------------------------------------------------------------------*/
 308
 309 static void end_unlink_async(struct ehci_hcd *ehci);
 310 static void unlink_empty_async(struct ehci_hcd *ehci);
 311 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
 312 static void ehci_work(struct ehci_hcd *ehci);
 313 static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 314 static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 315
 316 #include "ehci-timer.c"
 317 #include "ehci-hub.c"
 318 #include "ehci-mem.c"
 319 #include "ehci-q.c"
 320 #include "ehci-sched.c"
 321 #include "ehci-sysfs.c"
 322
 323 /*-------------------------------------------------------------------------*/
 324
 325 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
 326  * The firmware seems to think that powering off is a wakeup event!
 327  * This routine turns off remote wakeup and everything else, on all ports.
 328  */
 329 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
 330 {
 331         int     port = HCS_N_PORTS(ehci->hcs_params);
 332
 333         while (port--)
 334                 ehci_writel(ehci, PORT_RWC_BITS,
 335                                 &ehci->regs->port_status[port]);
 336 }
 337
 338 /*
 339  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
 340  * Must be called with interrupts enabled and the lock not held.
 341  */
 342 static void ehci_silence_controller(struct ehci_hcd *ehci)
 343 {
 344         ehci_halt(ehci);
 345
 346         spin_lock_irq(&ehci->lock);
 347         ehci->rh_state = EHCI_RH_HALTED;
 348         ehci_turn_off_all_ports(ehci);
 349
 350         /* make BIOS/etc use companion controller during reboot */
 351         ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 352
 353         /* unblock posted writes */
 354         ehci_readl(ehci, &ehci->regs->configured_flag);
 355         spin_unlock_irq(&ehci->lock);
 356 }
 357
 358 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
 359  * This forcibly disables dma and IRQs, helping kexec and other cases
 360  * where the next system software may expect clean state.
 361  */
 362 static void ehci_shutdown(struct usb_hcd *hcd)
 363 {
 364         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 365
 366         spin_lock_irq(&ehci->lock);
 367         ehci->shutdown = true;
 368         ehci->rh_state = EHCI_RH_STOPPING;
 369         ehci->enabled_hrtimer_events = 0;
 370         spin_unlock_irq(&ehci->lock);
 371
 372         ehci_silence_controller(ehci);
 373
 374         hrtimer_cancel(&ehci->hrtimer);
 375 }
 376
 377 /*-------------------------------------------------------------------------*/
 378
 379 /*
 380  * ehci_work is called from some interrupts, timers, and so on.
 381  * it calls driver completion functions, after dropping ehci->lock.
 382  */
 383 static void ehci_work (struct ehci_hcd *ehci)
 384 {
 385         /* another CPU may drop ehci->lock during a schedule scan while
 386          * it reports urb completions.  this flag guards against bogus
 387          * attempts at re-entrant schedule scanning.
 388          */
 389         if (ehci->scanning) {
 390                 ehci->need_rescan = true;
 391                 return;
 392         }
 393         ehci->scanning = true;
 394
 395  rescan:
 396         ehci->need_rescan = false;
 397         if (ehci->async_count)
 398                 scan_async(ehci);
 399         if (ehci->intr_count > 0)
 400                 scan_intr(ehci);
 401         if (ehci->isoc_count > 0)
 402                 scan_isoc(ehci);
 403         if (ehci->need_rescan)
 404                 goto rescan;
 405         ehci->scanning = false;
 406
 407         /* the IO watchdog guards against hardware or driver bugs that
 408          * misplace IRQs, and should let us run completely without IRQs.
 409          * such lossage has been observed on both VT6202 and VT8235.
 410          */
 411         turn_on_io_watchdog(ehci);
 412 }
 413
 414 /*
 415  * Called when the ehci_hcd module is removed.
 416  */
 417 static void ehci_stop (struct usb_hcd *hcd)
 418 {
 419         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 420
 421         ehci_dbg (ehci, "stop\n");
 422
 423         /* no more interrupts ... */
 424
 425         spin_lock_irq(&ehci->lock);
 426         ehci->enabled_hrtimer_events = 0;
 427         spin_unlock_irq(&ehci->lock);
 428
 429         ehci_quiesce(ehci);
 430         ehci_silence_controller(ehci);
 431         ehci_reset (ehci);
 432
 433         hrtimer_cancel(&ehci->hrtimer);
 434         remove_sysfs_files(ehci);
 435         remove_debug_files (ehci);
 436
 437         /* root hub is shut down separately (first, when possible) */
 438         spin_lock_irq (&ehci->lock);
 439         end_free_itds(ehci);
 440         spin_unlock_irq (&ehci->lock);
 441         ehci_mem_cleanup (ehci);
 442
 443         if (ehci->amd_pll_fix == 1)
 444                 usb_amd_dev_put();
 445
 446         dbg_status (ehci, "ehci_stop completed",
 447                     ehci_readl(ehci, &ehci->regs->status));
 448 }
 449
 450 /* one-time init, only for memory state */
 451 static int ehci_init(struct usb_hcd *hcd)
 452 {
 453         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 454         u32                     temp;
 455         int                     retval;
 456         u32                     hcc_params;
 457         struct ehci_qh_hw       *hw;
 458
 459         spin_lock_init(&ehci->lock);
 460
 461         /*
 462          * keep io watchdog by default, those good HCDs could turn off it later
 463          */
 464         ehci->need_io_watchdog = 1;
 465
 466         hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 467         ehci->hrtimer.function = ehci_hrtimer_func;
 468         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 469
 470         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 471
 472         /*
 473          * by default set standard 80% (== 100 usec/uframe) max periodic
 474          * bandwidth as required by USB 2.0
 475          */
 476         ehci->uframe_periodic_max = 100;
 477
 478         /*
 479          * hw default: 1K periodic list heads, one per frame.
 480          * periodic_size can shrink by USBCMD update if hcc_params allows.
 481          */
 482         ehci->periodic_size = DEFAULT_I_TDPS;
 483         INIT_LIST_HEAD(&ehci->async_unlink);
 484         INIT_LIST_HEAD(&ehci->async_idle);
 485         INIT_LIST_HEAD(&ehci->intr_unlink_wait);
 486         INIT_LIST_HEAD(&ehci->intr_unlink);
 487         INIT_LIST_HEAD(&ehci->intr_qh_list);
 488         INIT_LIST_HEAD(&ehci->cached_itd_list);
 489         INIT_LIST_HEAD(&ehci->cached_sitd_list);
 490         INIT_LIST_HEAD(&ehci->tt_list);
 491
 492         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 493                 /* periodic schedule size can be smaller than default */
 494                 switch (EHCI_TUNE_FLS) {
 495                 case 0: ehci->periodic_size = 1024; break;
 496                 case 1: ehci->periodic_size = 512; break;
 497                 case 2: ehci->periodic_size = 256; break;
 498                 default:        BUG();
 499                 }
 500         }
 501         if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
 502                 return retval;
 503
 504         /* controllers may cache some of the periodic schedule ... */
 505         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
 506                 ehci->i_thresh = 0;
 507         else                                    // N microframes cached
 508                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
 509
 510         /*
 511          * dedicate a qh for the async ring head, since we couldn't unlink
 512          * a 'real' qh without stopping the async schedule [4.8].  use it
 513          * as the 'reclamation list head' too.
 514          * its dummy is used in hw_alt_next of many tds, to prevent the qh
 515          * from automatically advancing to the next td after short reads.
 516          */
 517         ehci->async->qh_next.qh = NULL;
 518         hw = ehci->async->hw;
 519         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
 520         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
 521 #if defined(CONFIG_PPC_PS3)
 522         hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE);
 523 #endif
 524         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
 525         hw->hw_qtd_next = EHCI_LIST_END(ehci);
 526         ehci->async->qh_state = QH_STATE_LINKED;
 527         hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
 528
 529         /* clear interrupt enables, set irq latency */
 530         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
 531                 log2_irq_thresh = 0;
 532         temp = 1 << (16 + log2_irq_thresh);
 533         if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) {
 534                 ehci->has_ppcd = 1;
 535                 ehci_dbg(ehci, "enable per-port change event\n");
 536                 temp |= CMD_PPCEE;
 537         }
 538         if (HCC_CANPARK(hcc_params)) {
 539                 /* HW default park == 3, on hardware that supports it (like
 540                  * NVidia and ALI silicon), maximizes throughput on the async
 541                  * schedule by avoiding QH fetches between transfers.
 542                  *
 543                  * With fast usb storage devices and NForce2, "park" seems to
 544                  * make problems:  throughput reduction (!), data errors...
 545                  */
 546                 if (park) {
 547                         park = min(park, (unsigned) 3);
 548                         temp |= CMD_PARK;
 549                         temp |= park << 8;
 550                 }
 551                 ehci_dbg(ehci, "park %d\n", park);
 552         }
 553         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 554                 /* periodic schedule size can be smaller than default */
 555                 temp &= ~(3 << 2);
 556                 temp |= (EHCI_TUNE_FLS << 2);
 557         }
 558         ehci->command = temp;
 559
 560         /* Accept arbitrarily long scatter-gather lists */
 561         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
 562                 hcd->self.sg_tablesize = ~0;
 563         return 0;
 564 }
 565
 566 /* start HC running; it's halted, ehci_init() has been run (once) */
 567 static int ehci_run (struct usb_hcd *hcd)
 568 {
 569         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 570         u32                     temp;
 571         u32                     hcc_params;
 572
 573         hcd->uses_new_polling = 1;
 574
 575         /* EHCI spec section 4.1 */
 576
 577         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 578         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
 579
 580         /*
 581          * hcc_params controls whether ehci->regs->segment must (!!!)
 582          * be used; it constrains QH/ITD/SITD and QTD locations.
 583          * pci_pool consistent memory always uses segment zero.
 584          * streaming mappings for I/O buffers, like pci_map_single(),
 585          * can return segments above 4GB, if the device allows.
 586          *
 587          * NOTE:  the dma mask is visible through dma_supported(), so
 588          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 589          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 590          * host side drivers though.
 591          */
 592         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 593         if (HCC_64BIT_ADDR(hcc_params)) {
 594                 ehci_writel(ehci, 0, &ehci->regs->segment);
 595 #if 0
 596 // this is deeply broken on almost all architectures
 597                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
 598                         ehci_info(ehci, "enabled 64bit DMA\n");
 599 #endif
 600         }
 601
 602
 603         // Philips, Intel, and maybe others need CMD_RUN before the
 604         // root hub will detect new devices (why?); NEC doesn't
 605         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
 606         ehci->command |= CMD_RUN;
 607         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 608         dbg_cmd (ehci, "init", ehci->command);
 609
 610         /*
 611          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
 612          * are explicitly handed to companion controller(s), so no TT is
 613          * involved with the root hub.  (Except where one is integrated,
 614          * and there's no companion controller unless maybe for USB OTG.)
 615          *
 616          * Turning on the CF flag will transfer ownership of all ports
 617          * from the companions to the EHCI controller.  If any of the
 618          * companions are in the middle of a port reset at the time, it
 619          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
 620          * guarantees that no resets are in progress.  After we set CF,
 621          * a short delay lets the hardware catch up; new resets shouldn't
 622          * be started before the port switching actions could complete.
 623          */
 624         down_write(&ehci_cf_port_reset_rwsem);
 625         ehci->rh_state = EHCI_RH_RUNNING;
 626         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 627         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 628         msleep(5);
 629         up_write(&ehci_cf_port_reset_rwsem);
 630         ehci->last_periodic_enable = ktime_get_real();
 631
 632         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 633         ehci_info (ehci,
 634                 "USB %x.%x started, EHCI %x.%02x%s\n",
 635                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
 636                 temp >> 8, temp & 0xff,
 637                 ignore_oc ? ", overcurrent ignored" : "");
 638
 639         ehci_writel(ehci, INTR_MASK,
 640                     &ehci->regs->intr_enable); /* Turn On Interrupts */
 641
 642         /* GRR this is run-once init(), being done every time the HC starts.
 643          * So long as they're part of class devices, we can't do it init()
 644          * since the class device isn't created that early.
 645          */
 646         create_debug_files(ehci);
 647         create_sysfs_files(ehci);
 648
 649         return 0;
 650 }
 651
 652 int ehci_setup(struct usb_hcd *hcd)
 653 {
 654         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 655         int retval;
 656
 657         ehci->regs = (void __iomem *)ehci->caps +
 658             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 659         dbg_hcs_params(ehci, "reset");
 660         dbg_hcc_params(ehci, "reset");
 661
 662         /* cache this readonly data; minimize chip reads */
 663         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 664
 665         ehci->sbrn = HCD_USB2;
 666
 667         /* data structure init */
 668         retval = ehci_init(hcd);
 669         if (retval)
 670                 return retval;
 671
 672         retval = ehci_halt(ehci);
 673         if (retval)
 674                 return retval;
 675
 676         ehci_reset(ehci);
 677
 678         return 0;
 679 }
 680 EXPORT_SYMBOL_GPL(ehci_setup);
 681
 682 /*-------------------------------------------------------------------------*/
 683
 684 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 685 {
 686         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 687         u32                     status, masked_status, pcd_status = 0, cmd;
 688         int                     bh;
 689
 690         spin_lock (&ehci->lock);
 691
 692         status = ehci_readl(ehci, &ehci->regs->status);
 693
 694         /* e.g. cardbus physical eject */
 695         if (status == ~(u32) 0) {
 696                 ehci_dbg (ehci, "device removed\n");
 697                 goto dead;
 698         }
 699
 700         /*
 701          * We don't use STS_FLR, but some controllers don't like it to
 702          * remain on, so mask it out along with the other status bits.
 703          */
 704         masked_status = status & (INTR_MASK | STS_FLR);
 705
 706         /* Shared IRQ? */
 707         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
 708                 spin_unlock(&ehci->lock);
 709                 return IRQ_NONE;
 710         }
 711
 712         /* clear (just) interrupts */
 713         ehci_writel(ehci, masked_status, &ehci->regs->status);
 714         cmd = ehci_readl(ehci, &ehci->regs->command);
 715         bh = 0;
 716
 717 #ifdef  VERBOSE_DEBUG
 718         /* unrequested/ignored: Frame List Rollover */
 719         dbg_status (ehci, "irq", status);
 720 #endif
 721
 722         /* INT, ERR, and IAA interrupt rates can be throttled */
 723
 724         /* normal [4.15.1.2] or error [4.15.1.1] completion */
 725         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
 726                 if (likely ((status & STS_ERR) == 0))
 727                         COUNT (ehci->stats.normal);
 728                 else
 729                         COUNT (ehci->stats.error);
 730                 bh = 1;
 731         }
 732
 733         /* complete the unlinking of some qh [4.15.2.3] */
 734         if (status & STS_IAA) {
 735
 736                 /* Turn off the IAA watchdog */
 737                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
 738
 739                 /*
 740                  * Mild optimization: Allow another IAAD to reset the
 741                  * hrtimer, if one occurs before the next expiration.
 742                  * In theory we could always cancel the hrtimer, but
 743                  * tests show that about half the time it will be reset
 744                  * for some other event anyway.
 745                  */
 746                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
 747                         ++ehci->next_hrtimer_event;
 748
 749                 /* guard against (alleged) silicon errata */
 750                 if (cmd & CMD_IAAD)
 751                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
 752                 if (ehci->iaa_in_progress)
 753                         COUNT(ehci->stats.iaa);
 754                 end_unlink_async(ehci);
 755         }
 756
 757         /* remote wakeup [4.3.1] */
 758         if (status & STS_PCD) {
 759                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
 760                 u32             ppcd = ~0;
 761
 762                 /* kick root hub later */
 763                 pcd_status = status;
 764
 765                 /* resume root hub? */
 766                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
 767                         usb_hcd_resume_root_hub(hcd);
 768
 769                 /* get per-port change detect bits */
 770                 if (ehci->has_ppcd)
 771                         ppcd = status >> 16;
 772
 773                 while (i--) {
 774                         int pstatus;
 775
 776                         /* leverage per-port change bits feature */
 777                         if (!(ppcd & (1 << i)))
 778                                 continue;
 779                         pstatus = ehci_readl(ehci,
 780                                          &ehci->regs->port_status[i]);
 781
 782                         if (pstatus & PORT_OWNER)
 783                                 continue;
 784                         if (!(test_bit(i, &ehci->suspended_ports) &&
 785                                         ((pstatus & PORT_RESUME) ||
 786                                                 !(pstatus & PORT_SUSPEND)) &&
 787                                         (pstatus & PORT_PE) &&
 788                                         ehci->reset_done[i] == 0))
 789                                 continue;
 790
 791                         /* start 20 msec resume signaling from this port,
 792                          * and make khubd collect PORT_STAT_C_SUSPEND to
 793                          * stop that signaling.  Use 5 ms extra for safety,
 794                          * like usb_port_resume() does.
 795                          */
 796                         ehci->reset_done[i] = jiffies + msecs_to_jiffies(25);
 797                         set_bit(i, &ehci->resuming_ports);
 798                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
 799                         usb_hcd_start_port_resume(&hcd->self, i);
 800                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
 801                 }
 802         }
 803
 804         /* PCI errors [4.15.2.4] */
 805         if (unlikely ((status & STS_FATAL) != 0)) {
 806                 ehci_err(ehci, "fatal error\n");
 807                 dbg_cmd(ehci, "fatal", cmd);
 808                 dbg_status(ehci, "fatal", status);
 809 dead:
 810                 usb_hc_died(hcd);
 811
 812                 /* Don't let the controller do anything more */
 813                 ehci->shutdown = true;
 814                 ehci->rh_state = EHCI_RH_STOPPING;
 815                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
 816                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 817                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 818                 ehci_handle_controller_death(ehci);
 819
 820                 /* Handle completions when the controller stops */
 821                 bh = 0;
 822         }
 823
 824         if (bh)
 825                 ehci_work (ehci);
 826         spin_unlock (&ehci->lock);
 827         if (pcd_status)
 828                 usb_hcd_poll_rh_status(hcd);
 829         return IRQ_HANDLED;
 830 }
 831
 832 /*-------------------------------------------------------------------------*/
 833
 834 /*
 835  * non-error returns are a promise to giveback() the urb later
 836  * we drop ownership so next owner (or urb unlink) can get it
 837  *
 838  * urb + dev is in hcd.self.controller.urb_list
 839  * we're queueing TDs onto software and hardware lists
 840  *
 841  * hcd-specific init for hcpriv hasn't been done yet
 842  *
 843  * NOTE:  control, bulk, and interrupt share the same code to append TDs
 844  * to a (possibly active) QH, and the same QH scanning code.
 845  */
 846 static int ehci_urb_enqueue (
 847         struct usb_hcd  *hcd,
 848         struct urb      *urb,
 849         gfp_t           mem_flags
 850 ) {
 851         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 852         struct list_head        qtd_list;
 853
 854         INIT_LIST_HEAD (&qtd_list);
 855
 856         switch (usb_pipetype (urb->pipe)) {
 857         case PIPE_CONTROL:
 858                 /* qh_completions() code doesn't handle all the fault cases
 859                  * in multi-TD control transfers.  Even 1KB is rare anyway.
 860                  */
 861                 if (urb->transfer_buffer_length > (16 * 1024))
 862                         return -EMSGSIZE;
 863                 /* FALLTHROUGH */
 864         /* case PIPE_BULK: */
 865         default:
 866                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 867                         return -ENOMEM;
 868                 return submit_async(ehci, urb, &qtd_list, mem_flags);
 869
 870         case PIPE_INTERRUPT:
 871                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 872                         return -ENOMEM;
 873                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
 874
 875         case PIPE_ISOCHRONOUS:
 876                 if (urb->dev->speed == USB_SPEED_HIGH)
 877                         return itd_submit (ehci, urb, mem_flags);
 878                 else
 879                         return sitd_submit (ehci, urb, mem_flags);
 880         }
 881 }
 882
 883 /* remove from hardware lists
 884  * completions normally happen asynchronously
 885  */
 886
 887 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 888 {
 889         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 890         struct ehci_qh          *qh;
 891         unsigned long           flags;
 892         int                     rc;
 893
 894         spin_lock_irqsave (&ehci->lock, flags);
 895         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
 896         if (rc)
 897                 goto done;
 898
 899         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 900                 /*
 901                  * We don't expedite dequeue for isochronous URBs.
 902                  * Just wait until they complete normally or their
 903                  * time slot expires.
 904                  */
 905         } else {
 906                 qh = (struct ehci_qh *) urb->hcpriv;
 907                 qh->exception = 1;
 908                 switch (qh->qh_state) {
 909                 case QH_STATE_LINKED:
 910                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
 911                                 start_unlink_intr(ehci, qh);
 912                         else
 913                                 start_unlink_async(ehci, qh);
 914                         break;
 915                 case QH_STATE_COMPLETING:
 916                         qh->dequeue_during_giveback = 1;
 917                         break;
 918                 case QH_STATE_UNLINK:
 919                 case QH_STATE_UNLINK_WAIT:
 920                         /* already started */
 921                         break;
 922                 case QH_STATE_IDLE:
 923                         /* QH might be waiting for a Clear-TT-Buffer */
 924                         qh_completions(ehci, qh);
 925                         break;
 926                 }
 927         }
 928 done:
 929         spin_unlock_irqrestore (&ehci->lock, flags);
 930         return rc;
 931 }
 932
 933 /*-------------------------------------------------------------------------*/
 934
 935 // bulk qh holds the data toggle
 936
 937 static void
 938 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 939 {
 940         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 941         unsigned long           flags;
 942         struct ehci_qh          *qh;
 943
 944         /* ASSERT:  any requests/urbs are being unlinked */
 945         /* ASSERT:  nobody can be submitting urbs for this any more */
 946
 947 rescan:
 948         spin_lock_irqsave (&ehci->lock, flags);
 949         qh = ep->hcpriv;
 950         if (!qh)
 951                 goto done;
 952
 953         /* endpoints can be iso streams.  for now, we don't
 954          * accelerate iso completions ... so spin a while.
 955          */
 956         if (qh->hw == NULL) {
 957                 struct ehci_iso_stream  *stream = ep->hcpriv;
 958
 959                 if (!list_empty(&stream->td_list))
 960                         goto idle_timeout;
 961
 962                 /* BUG_ON(!list_empty(&stream->free_list)); */
 963                 reserve_release_iso_bandwidth(ehci, stream, -1);
 964                 kfree(stream);
 965                 goto done;
 966         }
 967
 968         qh->exception = 1;
 969         if (ehci->rh_state < EHCI_RH_RUNNING)
 970                 qh->qh_state = QH_STATE_IDLE;
 971         switch (qh->qh_state) {
 972         case QH_STATE_LINKED:
 973                 WARN_ON(!list_empty(&qh->qtd_list));
 974                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
 975                         start_unlink_async(ehci, qh);
 976                 else
 977                         start_unlink_intr(ehci, qh);
 978                 /* FALL THROUGH */
 979         case QH_STATE_COMPLETING:       /* already in unlinking */
 980         case QH_STATE_UNLINK:           /* wait for hw to finish? */
 981         case QH_STATE_UNLINK_WAIT:
 982 idle_timeout:
 983                 spin_unlock_irqrestore (&ehci->lock, flags);
 984                 schedule_timeout_uninterruptible(1);
 985                 goto rescan;
 986         case QH_STATE_IDLE:             /* fully unlinked */
 987                 if (qh->clearing_tt)
 988                         goto idle_timeout;
 989                 if (list_empty (&qh->qtd_list)) {
 990                         if (qh->ps.bw_uperiod)
 991                                 reserve_release_intr_bandwidth(ehci, qh, -1);
 992                         qh_destroy(ehci, qh);
 993                         break;
 994                 }
 995                 /* else FALL THROUGH */
 996         default:
 997                 /* caller was supposed to have unlinked any requests;
 998                  * that's not our job.  just leak this memory.
 999                  */
1000                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1001                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1002                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1003                 break;
1004         }
1005  done:
1006         ep->hcpriv = NULL;
1007         spin_unlock_irqrestore (&ehci->lock, flags);
1008 }
1009
1010 static void
1011 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1012 {
1013         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1014         struct ehci_qh          *qh;
1015         int                     eptype = usb_endpoint_type(&ep->desc);
1016         int                     epnum = usb_endpoint_num(&ep->desc);
1017         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1018         unsigned long           flags;
1019
1020         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1021                 return;
1022
1023         spin_lock_irqsave(&ehci->lock, flags);
1024         qh = ep->hcpriv;
1025
1026         /* For Bulk and Interrupt endpoints we maintain the toggle state
1027          * in the hardware; the toggle bits in udev aren't used at all.
1028          * When an endpoint is reset by usb_clear_halt() we must reset
1029          * the toggle bit in the QH.
1030          */
1031         if (qh) {
1032                 if (!list_empty(&qh->qtd_list)) {
1033                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1034                 } else {
1035                         /* The toggle value in the QH can't be updated
1036                          * while the QH is active.  Unlink it now;
1037                          * re-linking will call qh_refresh().
1038                          */
1039                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1040                         qh->exception = 1;
1041                         if (eptype == USB_ENDPOINT_XFER_BULK)
1042                                 start_unlink_async(ehci, qh);
1043                         else
1044                                 start_unlink_intr(ehci, qh);
1045                 }
1046         }
1047         spin_unlock_irqrestore(&ehci->lock, flags);
1048 }
1049
1050 static int ehci_get_frame (struct usb_hcd *hcd)
1051 {
1052         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1053         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1054 }
1055
1056 /*-------------------------------------------------------------------------*/
1057
1058 /* Device addition and removal */
1059
1060 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1061 {
1062         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1063
1064         spin_lock_irq(&ehci->lock);
1065         drop_tt(udev);
1066         spin_unlock_irq(&ehci->lock);
1067 }
1068
1069 /*-------------------------------------------------------------------------*/
1070
1071 #ifdef  CONFIG_PM
1072
1073 /* suspend/resume, section 4.3 */
1074
1075 /* These routines handle the generic parts of controller suspend/resume */
1076
1077 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1078 {
1079         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1080
1081         if (time_before(jiffies, ehci->next_statechange))
1082                 msleep(10);
1083
1084         /*
1085          * Root hub was already suspended.  Disable IRQ emission and
1086          * mark HW unaccessible.  The PM and USB cores make sure that
1087          * the root hub is either suspended or stopped.
1088          */
1089         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1090
1091         spin_lock_irq(&ehci->lock);
1092         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1093         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1094
1095         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1096         spin_unlock_irq(&ehci->lock);
1097
1098         synchronize_irq(hcd->irq);
1099
1100         /* Check for race with a wakeup request */
1101         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1102                 ehci_resume(hcd, false);
1103                 return -EBUSY;
1104         }
1105
1106         return 0;
1107 }
1108 EXPORT_SYMBOL_GPL(ehci_suspend);
1109
1110 /* Returns 0 if power was preserved, 1 if power was lost */
1111 int ehci_resume(struct usb_hcd *hcd, bool hibernated)
1112 {
1113         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1114
1115         if (time_before(jiffies, ehci->next_statechange))
1116                 msleep(100);
1117
1118         /* Mark hardware accessible again as we are back to full power by now */
1119         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1120
1121         if (ehci->shutdown)
1122                 return 0;               /* Controller is dead */
1123
1124         /*
1125          * If CF is still set and we aren't resuming from hibernation
1126          * then we maintained suspend power.
1127          * Just undo the effect of ehci_suspend().
1128          */
1129         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1130                         !hibernated) {
1131                 int     mask = INTR_MASK;
1132
1133                 ehci_prepare_ports_for_controller_resume(ehci);
1134
1135                 spin_lock_irq(&ehci->lock);
1136                 if (ehci->shutdown)
1137                         goto skip;
1138
1139                 if (!hcd->self.root_hub->do_remote_wakeup)
1140                         mask &= ~STS_PCD;
1141                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1142                 ehci_readl(ehci, &ehci->regs->intr_enable);
1143  skip:
1144                 spin_unlock_irq(&ehci->lock);
1145                 return 0;
1146         }
1147
1148         /*
1149          * Else reset, to cope with power loss or resume from hibernation
1150          * having let the firmware kick in during reboot.
1151          */
1152         usb_root_hub_lost_power(hcd->self.root_hub);
1153         (void) ehci_halt(ehci);
1154         (void) ehci_reset(ehci);
1155
1156         spin_lock_irq(&ehci->lock);
1157         if (ehci->shutdown)
1158                 goto skip;
1159
1160         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1161         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1162         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1163
1164         ehci->rh_state = EHCI_RH_SUSPENDED;
1165         spin_unlock_irq(&ehci->lock);
1166
1167         return 1;
1168 }
1169 EXPORT_SYMBOL_GPL(ehci_resume);
1170
1171 #endif
1172
1173 /*-------------------------------------------------------------------------*/
1174
1175 /*
1176  * Generic structure: This gets copied for platform drivers so that
1177  * individual entries can be overridden as needed.
1178  */
1179
1180 static const struct hc_driver ehci_hc_driver = {
1181         .description =          hcd_name,
1182         .product_desc =         "EHCI Host Controller",
1183         .hcd_priv_size =        sizeof(struct ehci_hcd),
1184
1185         /*
1186          * generic hardware linkage
1187          */
1188         .irq =                  ehci_irq,
1189         .flags =                HCD_MEMORY | HCD_USB2 | HCD_BH,
1190
1191         /*
1192          * basic lifecycle operations
1193          */
1194         .reset =                ehci_setup,
1195         .start =                ehci_run,
1196         .stop =                 ehci_stop,
1197         .shutdown =             ehci_shutdown,
1198
1199         /*
1200          * managing i/o requests and associated device resources
1201          */
1202         .urb_enqueue =          ehci_urb_enqueue,
1203         .urb_dequeue =          ehci_urb_dequeue,
1204         .endpoint_disable =     ehci_endpoint_disable,
1205         .endpoint_reset =       ehci_endpoint_reset,
1206         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1207
1208         /*
1209          * scheduling support
1210          */
1211         .get_frame_number =     ehci_get_frame,
1212
1213         /*
1214          * root hub support
1215          */
1216         .hub_status_data =      ehci_hub_status_data,
1217         .hub_control =          ehci_hub_control,
1218         .bus_suspend =          ehci_bus_suspend,
1219         .bus_resume =           ehci_bus_resume,
1220         .relinquish_port =      ehci_relinquish_port,
1221         .port_handed_over =     ehci_port_handed_over,
1222
1223         /*
1224          * device support
1225          */
1226         .free_dev =             ehci_remove_device,
1227 };
1228
1229 void ehci_init_driver(struct hc_driver *drv,
1230                 const struct ehci_driver_overrides *over)
1231 {
1232         /* Copy the generic table to drv and then apply the overrides */
1233         *drv = ehci_hc_driver;
1234
1235         if (over) {
1236                 drv->hcd_priv_size += over->extra_priv_size;
1237                 if (over->reset)
1238                         drv->reset = over->reset;
1239         }
1240 }
1241 EXPORT_SYMBOL_GPL(ehci_init_driver);
1242
1243 /*-------------------------------------------------------------------------*/
1244
1245 MODULE_DESCRIPTION(DRIVER_DESC);
1246 MODULE_AUTHOR (DRIVER_AUTHOR);
1247 MODULE_LICENSE ("GPL");
1248
1249 #ifdef CONFIG_USB_EHCI_FSL
1250 #include "ehci-fsl.c"
1251 #define PLATFORM_DRIVER         ehci_fsl_driver
1252 #endif
1253
1254 #ifdef CONFIG_USB_EHCI_SH
1255 #include "ehci-sh.c"
1256 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1257 #endif
1258
1259 #ifdef CONFIG_PPC_PS3
1260 #include "ehci-ps3.c"
1261 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1262 #endif
1263
1264 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1265 #include "ehci-ppc-of.c"
1266 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1267 #endif
1268
1269 #ifdef CONFIG_XPS_USB_HCD_XILINX
1270 #include "ehci-xilinx-of.c"
1271 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1272 #endif
1273
1274 #ifdef CONFIG_USB_OCTEON_EHCI
1275 #include "ehci-octeon.c"
1276 #define PLATFORM_DRIVER         ehci_octeon_driver
1277 #endif
1278
1279 #ifdef CONFIG_TILE_USB
1280 #include "ehci-tilegx.c"
1281 #define PLATFORM_DRIVER         ehci_hcd_tilegx_driver
1282 #endif
1283
1284 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1285 #include "ehci-pmcmsp.c"
1286 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1287 #endif
1288
1289 #ifdef CONFIG_SPARC_LEON
1290 #include "ehci-grlib.c"
1291 #define PLATFORM_DRIVER         ehci_grlib_driver
1292 #endif
1293
1294 #ifdef CONFIG_USB_EHCI_MV
1295 #include "ehci-mv.c"
1296 #define        PLATFORM_DRIVER         ehci_mv_driver
1297 #endif
1298
1299 #ifdef CONFIG_MIPS_SEAD3
1300 #include "ehci-sead3.c"
1301 #define PLATFORM_DRIVER         ehci_hcd_sead3_driver
1302 #endif
1303
1304 static int __init ehci_hcd_init(void)
1305 {
1306         int retval = 0;
1307
1308         if (usb_disabled())
1309                 return -ENODEV;
1310
1311         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1312         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1313         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1314                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1315                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1316                                 " before uhci_hcd and ohci_hcd, not after\n");
1317
1318         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1319                  hcd_name,
1320                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1321                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1322
1323 #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
1324         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1325         if (!ehci_debug_root) {
1326                 retval = -ENOENT;
1327                 goto err_debug;
1328         }
1329 #endif
1330
1331 #ifdef PLATFORM_DRIVER
1332         retval = platform_driver_register(&PLATFORM_DRIVER);
1333         if (retval < 0)
1334                 goto clean0;
1335 #endif
1336
1337 #ifdef PS3_SYSTEM_BUS_DRIVER
1338         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1339         if (retval < 0)
1340                 goto clean2;
1341 #endif
1342
1343 #ifdef OF_PLATFORM_DRIVER
1344         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1345         if (retval < 0)
1346                 goto clean3;
1347 #endif
1348
1349 #ifdef XILINX_OF_PLATFORM_DRIVER
1350         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1351         if (retval < 0)
1352                 goto clean4;
1353 #endif
1354         return retval;
1355
1356 #ifdef XILINX_OF_PLATFORM_DRIVER
1357         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1358 clean4:
1359 #endif
1360 #ifdef OF_PLATFORM_DRIVER
1361         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1362 clean3:
1363 #endif
1364 #ifdef PS3_SYSTEM_BUS_DRIVER
1365         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1366 clean2:
1367 #endif
1368 #ifdef PLATFORM_DRIVER
1369         platform_driver_unregister(&PLATFORM_DRIVER);
1370 clean0:
1371 #endif
1372 #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
1373         debugfs_remove(ehci_debug_root);
1374         ehci_debug_root = NULL;
1375 err_debug:
1376 #endif
1377         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1378         return retval;
1379 }
1380 module_init(ehci_hcd_init);
1381
1382 static void __exit ehci_hcd_cleanup(void)
1383 {
1384 #ifdef XILINX_OF_PLATFORM_DRIVER
1385         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1386 #endif
1387 #ifdef OF_PLATFORM_DRIVER
1388         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1389 #endif
1390 #ifdef PLATFORM_DRIVER
1391         platform_driver_unregister(&PLATFORM_DRIVER);
1392 #endif
1393 #ifdef PS3_SYSTEM_BUS_DRIVER
1394         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1395 #endif
1396 #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
1397         debugfs_remove(ehci_debug_root);
1398 #endif
1399         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1400 }
1401 module_exit(ehci_hcd_cleanup);