drivers/usb/host/ehci-hcd.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Enhanced Host Controller Interface (EHCI) driver for USB.
   4  *
   5  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   6  *
   7  * Copyright (c) 2000-2004 by David Brownell
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/pci.h>
  12 #include <linux/dmapool.h>
  13 #include <linux/kernel.h>
  14 #include <linux/delay.h>
  15 #include <linux/ioport.h>
  16 #include <linux/sched.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/hrtimer.h>
  21 #include <linux/list.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/usb.h>
  24 #include <linux/usb/hcd.h>
  25 #include <linux/usb/otg.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/debugfs.h>
  29 #include <linux/slab.h>
  30
  31 #include <asm/byteorder.h>
  32 #include <asm/io.h>
  33 #include <asm/irq.h>
  34 #include <asm/unaligned.h>
  35
  36 #if defined(CONFIG_PPC_PS3)
  37 #include <asm/firmware.h>
  38 #endif
  39
  40 /*-------------------------------------------------------------------------*/
  41
  42 /*
  43  * EHCI hc_driver implementation ... experimental, incomplete.
  44  * Based on the final 1.0 register interface specification.
  45  *
  46  * USB 2.0 shows up in upcoming www.pcmcia.org technology.
  47  * First was PCMCIA, like ISA; then CardBus, which is PCI.
  48  * Next comes "CardBay", using USB 2.0 signals.
  49  *
  50  * Contains additional contributions by Brad Hards, Rory Bolt, and others.
  51  * Special thanks to Intel and VIA for providing host controllers to
  52  * test this driver on, and Cypress (including In-System Design) for
  53  * providing early devices for those host controllers to talk to!
  54  */
  55
  56 #define DRIVER_AUTHOR "David Brownell"
  57 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
  58
  59 static const char       hcd_name [] = "ehci_hcd";
  60
  61
  62 #undef EHCI_URB_TRACE
  63
  64 /* magic numbers that can affect system performance */
  65 #define EHCI_TUNE_CERR          3       /* 0-3 qtd retries; 0 == don't stop */
  66 #define EHCI_TUNE_RL_HS         4       /* nak throttle; see 4.9 */
  67 #define EHCI_TUNE_RL_TT         0
  68 #define EHCI_TUNE_MULT_HS       1       /* 1-3 transactions/uframe; 4.10.3 */
  69 #define EHCI_TUNE_MULT_TT       1
  70 /*
  71  * Some drivers think it's safe to schedule isochronous transfers more than
  72  * 256 ms into the future (partly as a result of an old bug in the scheduling
  73  * code).  In an attempt to avoid trouble, we will use a minimum scheduling
  74  * length of 512 frames instead of 256.
  75  */
  76 #define EHCI_TUNE_FLS           1       /* (medium) 512-frame schedule */
  77
  78 /* Initial IRQ latency:  faster than hw default */
  79 static int log2_irq_thresh = 0;         // 0 to 6
  80 module_param (log2_irq_thresh, int, S_IRUGO);
  81 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
  82
  83 /* initial park setting:  slower than hw default */
  84 static unsigned park = 0;
  85 module_param (park, uint, S_IRUGO);
  86 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
  87
  88 /* for flakey hardware, ignore overcurrent indicators */
  89 static bool ignore_oc;
  90 module_param (ignore_oc, bool, S_IRUGO);
  91 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
  92
  93 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
  94
  95 /*-------------------------------------------------------------------------*/
  96
  97 #include "ehci.h"
  98 #include "pci-quirks.h"
  99
 100 static void compute_tt_budget(u8 budget_table[EHCI_BANDWIDTH_SIZE],
 101                 struct ehci_tt *tt);
 102
 103 /*
 104  * The MosChip MCS9990 controller updates its microframe counter
 105  * a little before the frame counter, and occasionally we will read
 106  * the invalid intermediate value.  Avoid problems by checking the
 107  * microframe number (the low-order 3 bits); if they are 0 then
 108  * re-read the register to get the correct value.
 109  */
 110 static unsigned ehci_moschip_read_frame_index(struct ehci_hcd *ehci)
 111 {
 112         unsigned uf;
 113
 114         uf = ehci_readl(ehci, &ehci->regs->frame_index);
 115         if (unlikely((uf & 7) == 0))
 116                 uf = ehci_readl(ehci, &ehci->regs->frame_index);
 117         return uf;
 118 }
 119
 120 static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci)
 121 {
 122         if (ehci->frame_index_bug)
 123                 return ehci_moschip_read_frame_index(ehci);
 124         return ehci_readl(ehci, &ehci->regs->frame_index);
 125 }
 126
 127 #include "ehci-dbg.c"
 128
 129 /*-------------------------------------------------------------------------*/
 130
 131 /*
 132  * ehci_handshake - spin reading hc until handshake completes or fails
 133  * @ptr: address of hc register to be read
 134  * @mask: bits to look at in result of read
 135  * @done: value of those bits when handshake succeeds
 136  * @usec: timeout in microseconds
 137  *
 138  * Returns negative errno, or zero on success
 139  *
 140  * Success happens when the "mask" bits have the specified value (hardware
 141  * handshake done).  There are two failure modes:  "usec" have passed (major
 142  * hardware flakeout), or the register reads as all-ones (hardware removed).
 143  *
 144  * That last failure should_only happen in cases like physical cardbus eject
 145  * before driver shutdown. But it also seems to be caused by bugs in cardbus
 146  * bridge shutdown:  shutting down the bridge before the devices using it.
 147  */
 148 int ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
 149                    u32 mask, u32 done, int usec)
 150 {
 151         u32     result;
 152
 153         do {
 154                 result = ehci_readl(ehci, ptr);
 155                 if (result == ~(u32)0)          /* card removed */
 156                         return -ENODEV;
 157                 result &= mask;
 158                 if (result == done)
 159                         return 0;
 160                 udelay (1);
 161                 usec--;
 162         } while (usec > 0);
 163         return -ETIMEDOUT;
 164 }
 165 EXPORT_SYMBOL_GPL(ehci_handshake);
 166
 167 /* check TDI/ARC silicon is in host mode */
 168 static int tdi_in_host_mode (struct ehci_hcd *ehci)
 169 {
 170         u32             tmp;
 171
 172         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
 173         return (tmp & 3) == USBMODE_CM_HC;
 174 }
 175
 176 /*
 177  * Force HC to halt state from unknown (EHCI spec section 2.3).
 178  * Must be called with interrupts enabled and the lock not held.
 179  */
 180 static int ehci_halt (struct ehci_hcd *ehci)
 181 {
 182         u32     temp;
 183
 184         spin_lock_irq(&ehci->lock);
 185
 186         /* disable any irqs left enabled by previous code */
 187         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 188
 189         if (ehci_is_TDI(ehci) && !tdi_in_host_mode(ehci)) {
 190                 spin_unlock_irq(&ehci->lock);
 191                 return 0;
 192         }
 193
 194         /*
 195          * This routine gets called during probe before ehci->command
 196          * has been initialized, so we can't rely on its value.
 197          */
 198         ehci->command &= ~CMD_RUN;
 199         temp = ehci_readl(ehci, &ehci->regs->command);
 200         temp &= ~(CMD_RUN | CMD_IAAD);
 201         ehci_writel(ehci, temp, &ehci->regs->command);
 202
 203         spin_unlock_irq(&ehci->lock);
 204         synchronize_irq(ehci_to_hcd(ehci)->irq);
 205
 206         return ehci_handshake(ehci, &ehci->regs->status,
 207                           STS_HALT, STS_HALT, 16 * 125);
 208 }
 209
 210 /* put TDI/ARC silicon into EHCI mode */
 211 static void tdi_reset (struct ehci_hcd *ehci)
 212 {
 213         u32             tmp;
 214
 215         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
 216         tmp |= USBMODE_CM_HC;
 217         /* The default byte access to MMR space is LE after
 218          * controller reset. Set the required endian mode
 219          * for transfer buffers to match the host microprocessor
 220          */
 221         if (ehci_big_endian_mmio(ehci))
 222                 tmp |= USBMODE_BE;
 223         ehci_writel(ehci, tmp, &ehci->regs->usbmode);
 224 }
 225
 226 /*
 227  * Reset a non-running (STS_HALT == 1) controller.
 228  * Must be called with interrupts enabled and the lock not held.
 229  */
 230 int ehci_reset(struct ehci_hcd *ehci)
 231 {
 232         int     retval;
 233         u32     command = ehci_readl(ehci, &ehci->regs->command);
 234
 235         /* If the EHCI debug controller is active, special care must be
 236          * taken before and after a host controller reset */
 237         if (ehci->debug && !dbgp_reset_prep(ehci_to_hcd(ehci)))
 238                 ehci->debug = NULL;
 239
 240         command |= CMD_RESET;
 241         dbg_cmd (ehci, "reset", command);
 242         ehci_writel(ehci, command, &ehci->regs->command);
 243         ehci->rh_state = EHCI_RH_HALTED;
 244         ehci->next_statechange = jiffies;
 245         retval = ehci_handshake(ehci, &ehci->regs->command,
 246                             CMD_RESET, 0, 250 * 1000);
 247
 248         if (ehci->has_hostpc) {
 249                 ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
 250                                 &ehci->regs->usbmode_ex);
 251                 ehci_writel(ehci, TXFIFO_DEFAULT, &ehci->regs->txfill_tuning);
 252         }
 253         if (retval)
 254                 return retval;
 255
 256         if (ehci_is_TDI(ehci))
 257                 tdi_reset (ehci);
 258
 259         if (ehci->debug)
 260                 dbgp_external_startup(ehci_to_hcd(ehci));
 261
 262         ehci->port_c_suspend = ehci->suspended_ports =
 263                         ehci->resuming_ports = 0;
 264         return retval;
 265 }
 266 EXPORT_SYMBOL_GPL(ehci_reset);
 267
 268 /*
 269  * Idle the controller (turn off the schedules).
 270  * Must be called with interrupts enabled and the lock not held.
 271  */
 272 static void ehci_quiesce (struct ehci_hcd *ehci)
 273 {
 274         u32     temp;
 275
 276         if (ehci->rh_state != EHCI_RH_RUNNING)
 277                 return;
 278
 279         /* wait for any schedule enables/disables to take effect */
 280         temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
 281         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp,
 282                         16 * 125);
 283
 284         /* then disable anything that's still active */
 285         spin_lock_irq(&ehci->lock);
 286         ehci->command &= ~(CMD_ASE | CMD_PSE);
 287         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 288         spin_unlock_irq(&ehci->lock);
 289
 290         /* hardware can take 16 microframes to turn off ... */
 291         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0,
 292                         16 * 125);
 293 }
 294
 295 /*-------------------------------------------------------------------------*/
 296
 297 static void end_iaa_cycle(struct ehci_hcd *ehci);
 298 static void end_unlink_async(struct ehci_hcd *ehci);
 299 static void unlink_empty_async(struct ehci_hcd *ehci);
 300 static void ehci_work(struct ehci_hcd *ehci);
 301 static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 302 static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 303 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable);
 304
 305 #include "ehci-timer.c"
 306 #include "ehci-hub.c"
 307 #include "ehci-mem.c"
 308 #include "ehci-q.c"
 309 #include "ehci-sched.c"
 310 #include "ehci-sysfs.c"
 311
 312 /*-------------------------------------------------------------------------*/
 313
 314 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
 315  * The firmware seems to think that powering off is a wakeup event!
 316  * This routine turns off remote wakeup and everything else, on all ports.
 317  */
 318 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
 319 {
 320         int     port = HCS_N_PORTS(ehci->hcs_params);
 321
 322         while (port--) {
 323                 spin_unlock_irq(&ehci->lock);
 324                 ehci_port_power(ehci, port, false);
 325                 spin_lock_irq(&ehci->lock);
 326                 ehci_writel(ehci, PORT_RWC_BITS,
 327                                 &ehci->regs->port_status[port]);
 328         }
 329 }
 330
 331 /*
 332  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
 333  * Must be called with interrupts enabled and the lock not held.
 334  */
 335 static void ehci_silence_controller(struct ehci_hcd *ehci)
 336 {
 337         ehci_halt(ehci);
 338
 339         spin_lock_irq(&ehci->lock);
 340         ehci->rh_state = EHCI_RH_HALTED;
 341         ehci_turn_off_all_ports(ehci);
 342
 343         /* make BIOS/etc use companion controller during reboot */
 344         ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 345
 346         /* unblock posted writes */
 347         ehci_readl(ehci, &ehci->regs->configured_flag);
 348         spin_unlock_irq(&ehci->lock);
 349 }
 350
 351 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
 352  * This forcibly disables dma and IRQs, helping kexec and other cases
 353  * where the next system software may expect clean state.
 354  */
 355 static void ehci_shutdown(struct usb_hcd *hcd)
 356 {
 357         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 358
 359         /**
 360          * Protect the system from crashing at system shutdown in cases where
 361          * usb host is not added yet from OTG controller driver.
 362          * As ehci_setup() not done yet, so stop accessing registers or
 363          * variables initialized in ehci_setup()
 364          */
 365         if (!ehci->sbrn)
 366                 return;
 367
 368         spin_lock_irq(&ehci->lock);
 369         ehci->shutdown = true;
 370         ehci->rh_state = EHCI_RH_STOPPING;
 371         ehci->enabled_hrtimer_events = 0;
 372         spin_unlock_irq(&ehci->lock);
 373
 374         ehci_silence_controller(ehci);
 375
 376         hrtimer_cancel(&ehci->hrtimer);
 377 }
 378
 379 /*-------------------------------------------------------------------------*/
 380
 381 /*
 382  * ehci_work is called from some interrupts, timers, and so on.
 383  * it calls driver completion functions, after dropping ehci->lock.
 384  */
 385 static void ehci_work (struct ehci_hcd *ehci)
 386 {
 387         /* another CPU may drop ehci->lock during a schedule scan while
 388          * it reports urb completions.  this flag guards against bogus
 389          * attempts at re-entrant schedule scanning.
 390          */
 391         if (ehci->scanning) {
 392                 ehci->need_rescan = true;
 393                 return;
 394         }
 395         ehci->scanning = true;
 396
 397  rescan:
 398         ehci->need_rescan = false;
 399         if (ehci->async_count)
 400                 scan_async(ehci);
 401         if (ehci->intr_count > 0)
 402                 scan_intr(ehci);
 403         if (ehci->isoc_count > 0)
 404                 scan_isoc(ehci);
 405         if (ehci->need_rescan)
 406                 goto rescan;
 407         ehci->scanning = false;
 408
 409         /* the IO watchdog guards against hardware or driver bugs that
 410          * misplace IRQs, and should let us run completely without IRQs.
 411          * such lossage has been observed on both VT6202 and VT8235.
 412          */
 413         turn_on_io_watchdog(ehci);
 414 }
 415
 416 /*
 417  * Called when the ehci_hcd module is removed.
 418  */
 419 static void ehci_stop (struct usb_hcd *hcd)
 420 {
 421         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 422
 423         ehci_dbg (ehci, "stop\n");
 424
 425         /* no more interrupts ... */
 426
 427         spin_lock_irq(&ehci->lock);
 428         ehci->enabled_hrtimer_events = 0;
 429         spin_unlock_irq(&ehci->lock);
 430
 431         ehci_quiesce(ehci);
 432         ehci_silence_controller(ehci);
 433         ehci_reset (ehci);
 434
 435         hrtimer_cancel(&ehci->hrtimer);
 436         remove_sysfs_files(ehci);
 437         remove_debug_files (ehci);
 438
 439         /* root hub is shut down separately (first, when possible) */
 440         spin_lock_irq (&ehci->lock);
 441         end_free_itds(ehci);
 442         spin_unlock_irq (&ehci->lock);
 443         ehci_mem_cleanup (ehci);
 444
 445         if (ehci->amd_pll_fix == 1)
 446                 usb_amd_dev_put();
 447
 448         dbg_status (ehci, "ehci_stop completed",
 449                     ehci_readl(ehci, &ehci->regs->status));
 450 }
 451
 452 /* one-time init, only for memory state */
 453 static int ehci_init(struct usb_hcd *hcd)
 454 {
 455         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 456         u32                     temp;
 457         int                     retval;
 458         u32                     hcc_params;
 459         struct ehci_qh_hw       *hw;
 460
 461         spin_lock_init(&ehci->lock);
 462
 463         /*
 464          * keep io watchdog by default, those good HCDs could turn off it later
 465          */
 466         ehci->need_io_watchdog = 1;
 467
 468         hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 469         ehci->hrtimer.function = ehci_hrtimer_func;
 470         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 471
 472         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 473
 474         /*
 475          * by default set standard 80% (== 100 usec/uframe) max periodic
 476          * bandwidth as required by USB 2.0
 477          */
 478         ehci->uframe_periodic_max = 100;
 479
 480         /*
 481          * hw default: 1K periodic list heads, one per frame.
 482          * periodic_size can shrink by USBCMD update if hcc_params allows.
 483          */
 484         ehci->periodic_size = DEFAULT_I_TDPS;
 485         INIT_LIST_HEAD(&ehci->async_unlink);
 486         INIT_LIST_HEAD(&ehci->async_idle);
 487         INIT_LIST_HEAD(&ehci->intr_unlink_wait);
 488         INIT_LIST_HEAD(&ehci->intr_unlink);
 489         INIT_LIST_HEAD(&ehci->intr_qh_list);
 490         INIT_LIST_HEAD(&ehci->cached_itd_list);
 491         INIT_LIST_HEAD(&ehci->cached_sitd_list);
 492         INIT_LIST_HEAD(&ehci->tt_list);
 493
 494         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 495                 /* periodic schedule size can be smaller than default */
 496                 switch (EHCI_TUNE_FLS) {
 497                 case 0: ehci->periodic_size = 1024; break;
 498                 case 1: ehci->periodic_size = 512; break;
 499                 case 2: ehci->periodic_size = 256; break;
 500                 default:        BUG();
 501                 }
 502         }
 503         if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
 504                 return retval;
 505
 506         /* controllers may cache some of the periodic schedule ... */
 507         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
 508                 ehci->i_thresh = 0;
 509         else                                    // N microframes cached
 510                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
 511
 512         /*
 513          * dedicate a qh for the async ring head, since we couldn't unlink
 514          * a 'real' qh without stopping the async schedule [4.8].  use it
 515          * as the 'reclamation list head' too.
 516          * its dummy is used in hw_alt_next of many tds, to prevent the qh
 517          * from automatically advancing to the next td after short reads.
 518          */
 519         ehci->async->qh_next.qh = NULL;
 520         hw = ehci->async->hw;
 521         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
 522         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
 523 #if defined(CONFIG_PPC_PS3)
 524         hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE);
 525 #endif
 526         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
 527         hw->hw_qtd_next = EHCI_LIST_END(ehci);
 528         ehci->async->qh_state = QH_STATE_LINKED;
 529         hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
 530
 531         /* clear interrupt enables, set irq latency */
 532         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
 533                 log2_irq_thresh = 0;
 534         temp = 1 << (16 + log2_irq_thresh);
 535         if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) {
 536                 ehci->has_ppcd = 1;
 537                 ehci_dbg(ehci, "enable per-port change event\n");
 538                 temp |= CMD_PPCEE;
 539         }
 540         if (HCC_CANPARK(hcc_params)) {
 541                 /* HW default park == 3, on hardware that supports it (like
 542                  * NVidia and ALI silicon), maximizes throughput on the async
 543                  * schedule by avoiding QH fetches between transfers.
 544                  *
 545                  * With fast usb storage devices and NForce2, "park" seems to
 546                  * make problems:  throughput reduction (!), data errors...
 547                  */
 548                 if (park) {
 549                         park = min(park, (unsigned) 3);
 550                         temp |= CMD_PARK;
 551                         temp |= park << 8;
 552                 }
 553                 ehci_dbg(ehci, "park %d\n", park);
 554         }
 555         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 556                 /* periodic schedule size can be smaller than default */
 557                 temp &= ~(3 << 2);
 558                 temp |= (EHCI_TUNE_FLS << 2);
 559         }
 560         ehci->command = temp;
 561
 562         /* Accept arbitrarily long scatter-gather lists */
 563         if (!hcd->localmem_pool)
 564                 hcd->self.sg_tablesize = ~0;
 565
 566         /* Prepare for unlinking active QHs */
 567         ehci->old_current = ~0;
 568         return 0;
 569 }
 570
 571 /* start HC running; it's halted, ehci_init() has been run (once) */
 572 static int ehci_run (struct usb_hcd *hcd)
 573 {
 574         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 575         u32                     temp;
 576         u32                     hcc_params;
 577
 578         hcd->uses_new_polling = 1;
 579
 580         /* EHCI spec section 4.1 */
 581
 582         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 583         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
 584
 585         /*
 586          * hcc_params controls whether ehci->regs->segment must (!!!)
 587          * be used; it constrains QH/ITD/SITD and QTD locations.
 588          * dma_pool consistent memory always uses segment zero.
 589          * streaming mappings for I/O buffers, like pci_map_single(),
 590          * can return segments above 4GB, if the device allows.
 591          *
 592          * NOTE:  the dma mask is visible through dev->dma_mask, so
 593          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 594          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 595          * host side drivers though.
 596          */
 597         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 598         if (HCC_64BIT_ADDR(hcc_params)) {
 599                 ehci_writel(ehci, 0, &ehci->regs->segment);
 600 #if 0
 601 // this is deeply broken on almost all architectures
 602                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
 603                         ehci_info(ehci, "enabled 64bit DMA\n");
 604 #endif
 605         }
 606
 607
 608         // Philips, Intel, and maybe others need CMD_RUN before the
 609         // root hub will detect new devices (why?); NEC doesn't
 610         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
 611         ehci->command |= CMD_RUN;
 612         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 613         dbg_cmd (ehci, "init", ehci->command);
 614
 615         /*
 616          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
 617          * are explicitly handed to companion controller(s), so no TT is
 618          * involved with the root hub.  (Except where one is integrated,
 619          * and there's no companion controller unless maybe for USB OTG.)
 620          *
 621          * Turning on the CF flag will transfer ownership of all ports
 622          * from the companions to the EHCI controller.  If any of the
 623          * companions are in the middle of a port reset at the time, it
 624          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
 625          * guarantees that no resets are in progress.  After we set CF,
 626          * a short delay lets the hardware catch up; new resets shouldn't
 627          * be started before the port switching actions could complete.
 628          */
 629         down_write(&ehci_cf_port_reset_rwsem);
 630         ehci->rh_state = EHCI_RH_RUNNING;
 631         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 632         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 633         msleep(5);
 634         up_write(&ehci_cf_port_reset_rwsem);
 635         ehci->last_periodic_enable = ktime_get_real();
 636
 637         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 638         ehci_info (ehci,
 639                 "USB %x.%x started, EHCI %x.%02x%s\n",
 640                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
 641                 temp >> 8, temp & 0xff,
 642                 ignore_oc ? ", overcurrent ignored" : "");
 643
 644         ehci_writel(ehci, INTR_MASK,
 645                     &ehci->regs->intr_enable); /* Turn On Interrupts */
 646
 647         /* GRR this is run-once init(), being done every time the HC starts.
 648          * So long as they're part of class devices, we can't do it init()
 649          * since the class device isn't created that early.
 650          */
 651         create_debug_files(ehci);
 652         create_sysfs_files(ehci);
 653
 654         return 0;
 655 }
 656
 657 int ehci_setup(struct usb_hcd *hcd)
 658 {
 659         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 660         int retval;
 661
 662         ehci->regs = (void __iomem *)ehci->caps +
 663             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 664         dbg_hcs_params(ehci, "reset");
 665         dbg_hcc_params(ehci, "reset");
 666
 667         /* cache this readonly data; minimize chip reads */
 668         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 669
 670         ehci->sbrn = HCD_USB2;
 671
 672         /* data structure init */
 673         retval = ehci_init(hcd);
 674         if (retval)
 675                 return retval;
 676
 677         retval = ehci_halt(ehci);
 678         if (retval) {
 679                 ehci_mem_cleanup(ehci);
 680                 return retval;
 681         }
 682
 683         ehci_reset(ehci);
 684
 685         return 0;
 686 }
 687 EXPORT_SYMBOL_GPL(ehci_setup);
 688
 689 /*-------------------------------------------------------------------------*/
 690
 691 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 692 {
 693         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 694         u32                     status, masked_status, pcd_status = 0, cmd;
 695         int                     bh;
 696         unsigned long           flags;
 697
 698         /*
 699          * For threadirqs option we use spin_lock_irqsave() variant to prevent
 700          * deadlock with ehci hrtimer callback, because hrtimer callbacks run
 701          * in interrupt context even when threadirqs is specified. We can go
 702          * back to spin_lock() variant when hrtimer callbacks become threaded.
 703          */
 704         spin_lock_irqsave(&ehci->lock, flags);
 705
 706         status = ehci_readl(ehci, &ehci->regs->status);
 707
 708         /* e.g. cardbus physical eject */
 709         if (status == ~(u32) 0) {
 710                 ehci_dbg (ehci, "device removed\n");
 711                 goto dead;
 712         }
 713
 714         /*
 715          * We don't use STS_FLR, but some controllers don't like it to
 716          * remain on, so mask it out along with the other status bits.
 717          */
 718         masked_status = status & (INTR_MASK | STS_FLR);
 719
 720         /* Shared IRQ? */
 721         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
 722                 spin_unlock_irqrestore(&ehci->lock, flags);
 723                 return IRQ_NONE;
 724         }
 725
 726         /* clear (just) interrupts */
 727         ehci_writel(ehci, masked_status, &ehci->regs->status);
 728         cmd = ehci_readl(ehci, &ehci->regs->command);
 729         bh = 0;
 730
 731         /* normal [4.15.1.2] or error [4.15.1.1] completion */
 732         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
 733                 if (likely ((status & STS_ERR) == 0))
 734                         INCR(ehci->stats.normal);
 735                 else
 736                         INCR(ehci->stats.error);
 737                 bh = 1;
 738         }
 739
 740         /* complete the unlinking of some qh [4.15.2.3] */
 741         if (status & STS_IAA) {
 742
 743                 /* Turn off the IAA watchdog */
 744                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
 745
 746                 /*
 747                  * Mild optimization: Allow another IAAD to reset the
 748                  * hrtimer, if one occurs before the next expiration.
 749                  * In theory we could always cancel the hrtimer, but
 750                  * tests show that about half the time it will be reset
 751                  * for some other event anyway.
 752                  */
 753                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
 754                         ++ehci->next_hrtimer_event;
 755
 756                 /* guard against (alleged) silicon errata */
 757                 if (cmd & CMD_IAAD)
 758                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
 759                 if (ehci->iaa_in_progress)
 760                         INCR(ehci->stats.iaa);
 761                 end_iaa_cycle(ehci);
 762         }
 763
 764         /* remote wakeup [4.3.1] */
 765         if (status & STS_PCD) {
 766                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
 767                 u32             ppcd = ~0;
 768
 769                 /* kick root hub later */
 770                 pcd_status = status;
 771
 772                 /* resume root hub? */
 773                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
 774                         usb_hcd_resume_root_hub(hcd);
 775
 776                 /* get per-port change detect bits */
 777                 if (ehci->has_ppcd)
 778                         ppcd = status >> 16;
 779
 780                 while (i--) {
 781                         int pstatus;
 782
 783                         /* leverage per-port change bits feature */
 784                         if (!(ppcd & (1 << i)))
 785                                 continue;
 786                         pstatus = ehci_readl(ehci,
 787                                          &ehci->regs->port_status[i]);
 788
 789                         if (pstatus & PORT_OWNER)
 790                                 continue;
 791                         if (!(test_bit(i, &ehci->suspended_ports) &&
 792                                         ((pstatus & PORT_RESUME) ||
 793                                                 !(pstatus & PORT_SUSPEND)) &&
 794                                         (pstatus & PORT_PE) &&
 795                                         ehci->reset_done[i] == 0))
 796                                 continue;
 797
 798                         /* start USB_RESUME_TIMEOUT msec resume signaling from
 799                          * this port, and make hub_wq collect
 800                          * PORT_STAT_C_SUSPEND to stop that signaling.
 801                          */
 802                         ehci->reset_done[i] = jiffies +
 803                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
 804                         set_bit(i, &ehci->resuming_ports);
 805                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
 806                         usb_hcd_start_port_resume(&hcd->self, i);
 807                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
 808                 }
 809         }
 810
 811         /* PCI errors [4.15.2.4] */
 812         if (unlikely ((status & STS_FATAL) != 0)) {
 813                 ehci_err(ehci, "fatal error\n");
 814                 dbg_cmd(ehci, "fatal", cmd);
 815                 dbg_status(ehci, "fatal", status);
 816 dead:
 817                 usb_hc_died(hcd);
 818
 819                 /* Don't let the controller do anything more */
 820                 ehci->shutdown = true;
 821                 ehci->rh_state = EHCI_RH_STOPPING;
 822                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
 823                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 824                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 825                 ehci_handle_controller_death(ehci);
 826
 827                 /* Handle completions when the controller stops */
 828                 bh = 0;
 829         }
 830
 831         if (bh)
 832                 ehci_work (ehci);
 833         spin_unlock_irqrestore(&ehci->lock, flags);
 834         if (pcd_status)
 835                 usb_hcd_poll_rh_status(hcd);
 836         return IRQ_HANDLED;
 837 }
 838
 839 /*-------------------------------------------------------------------------*/
 840
 841 /*
 842  * non-error returns are a promise to giveback() the urb later
 843  * we drop ownership so next owner (or urb unlink) can get it
 844  *
 845  * urb + dev is in hcd.self.controller.urb_list
 846  * we're queueing TDs onto software and hardware lists
 847  *
 848  * hcd-specific init for hcpriv hasn't been done yet
 849  *
 850  * NOTE:  control, bulk, and interrupt share the same code to append TDs
 851  * to a (possibly active) QH, and the same QH scanning code.
 852  */
 853 static int ehci_urb_enqueue (
 854         struct usb_hcd  *hcd,
 855         struct urb      *urb,
 856         gfp_t           mem_flags
 857 ) {
 858         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 859         struct list_head        qtd_list;
 860
 861         INIT_LIST_HEAD (&qtd_list);
 862
 863         switch (usb_pipetype (urb->pipe)) {
 864         case PIPE_CONTROL:
 865                 /* qh_completions() code doesn't handle all the fault cases
 866                  * in multi-TD control transfers.  Even 1KB is rare anyway.
 867                  */
 868                 if (urb->transfer_buffer_length > (16 * 1024))
 869                         return -EMSGSIZE;
 870                 /* FALLTHROUGH */
 871         /* case PIPE_BULK: */
 872         default:
 873                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 874                         return -ENOMEM;
 875                 return submit_async(ehci, urb, &qtd_list, mem_flags);
 876
 877         case PIPE_INTERRUPT:
 878                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 879                         return -ENOMEM;
 880                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
 881
 882         case PIPE_ISOCHRONOUS:
 883                 if (urb->dev->speed == USB_SPEED_HIGH)
 884                         return itd_submit (ehci, urb, mem_flags);
 885                 else
 886                         return sitd_submit (ehci, urb, mem_flags);
 887         }
 888 }
 889
 890 /* remove from hardware lists
 891  * completions normally happen asynchronously
 892  */
 893
 894 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 895 {
 896         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 897         struct ehci_qh          *qh;
 898         unsigned long           flags;
 899         int                     rc;
 900
 901         spin_lock_irqsave (&ehci->lock, flags);
 902         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
 903         if (rc)
 904                 goto done;
 905
 906         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 907                 /*
 908                  * We don't expedite dequeue for isochronous URBs.
 909                  * Just wait until they complete normally or their
 910                  * time slot expires.
 911                  */
 912         } else {
 913                 qh = (struct ehci_qh *) urb->hcpriv;
 914                 qh->unlink_reason |= QH_UNLINK_REQUESTED;
 915                 switch (qh->qh_state) {
 916                 case QH_STATE_LINKED:
 917                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
 918                                 start_unlink_intr(ehci, qh);
 919                         else
 920                                 start_unlink_async(ehci, qh);
 921                         break;
 922                 case QH_STATE_COMPLETING:
 923                         qh->dequeue_during_giveback = 1;
 924                         break;
 925                 case QH_STATE_UNLINK:
 926                 case QH_STATE_UNLINK_WAIT:
 927                         /* already started */
 928                         break;
 929                 case QH_STATE_IDLE:
 930                         /* QH might be waiting for a Clear-TT-Buffer */
 931                         qh_completions(ehci, qh);
 932                         break;
 933                 }
 934         }
 935 done:
 936         spin_unlock_irqrestore (&ehci->lock, flags);
 937         return rc;
 938 }
 939
 940 /*-------------------------------------------------------------------------*/
 941
 942 // bulk qh holds the data toggle
 943
 944 static void
 945 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 946 {
 947         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 948         unsigned long           flags;
 949         struct ehci_qh          *qh;
 950
 951         /* ASSERT:  any requests/urbs are being unlinked */
 952         /* ASSERT:  nobody can be submitting urbs for this any more */
 953
 954 rescan:
 955         spin_lock_irqsave (&ehci->lock, flags);
 956         qh = ep->hcpriv;
 957         if (!qh)
 958                 goto done;
 959
 960         /* endpoints can be iso streams.  for now, we don't
 961          * accelerate iso completions ... so spin a while.
 962          */
 963         if (qh->hw == NULL) {
 964                 struct ehci_iso_stream  *stream = ep->hcpriv;
 965
 966                 if (!list_empty(&stream->td_list))
 967                         goto idle_timeout;
 968
 969                 /* BUG_ON(!list_empty(&stream->free_list)); */
 970                 reserve_release_iso_bandwidth(ehci, stream, -1);
 971                 kfree(stream);
 972                 goto done;
 973         }
 974
 975         qh->unlink_reason |= QH_UNLINK_REQUESTED;
 976         switch (qh->qh_state) {
 977         case QH_STATE_LINKED:
 978                 if (list_empty(&qh->qtd_list))
 979                         qh->unlink_reason |= QH_UNLINK_QUEUE_EMPTY;
 980                 else
 981                         WARN_ON(1);
 982                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
 983                         start_unlink_async(ehci, qh);
 984                 else
 985                         start_unlink_intr(ehci, qh);
 986                 fallthrough;
 987         case QH_STATE_COMPLETING:       /* already in unlinking */
 988         case QH_STATE_UNLINK:           /* wait for hw to finish? */
 989         case QH_STATE_UNLINK_WAIT:
 990 idle_timeout:
 991                 spin_unlock_irqrestore (&ehci->lock, flags);
 992                 schedule_timeout_uninterruptible(1);
 993                 goto rescan;
 994         case QH_STATE_IDLE:             /* fully unlinked */
 995                 if (qh->clearing_tt)
 996                         goto idle_timeout;
 997                 if (list_empty (&qh->qtd_list)) {
 998                         if (qh->ps.bw_uperiod)
 999                                 reserve_release_intr_bandwidth(ehci, qh, -1);
1000                         qh_destroy(ehci, qh);
1001                         break;
1002                 }
1003                 fallthrough;
1004         default:
1005                 /* caller was supposed to have unlinked any requests;
1006                  * that's not our job.  just leak this memory.
1007                  */
1008                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1009                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1010                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1011                 break;
1012         }
1013  done:
1014         ep->hcpriv = NULL;
1015         spin_unlock_irqrestore (&ehci->lock, flags);
1016 }
1017
1018 static void
1019 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1020 {
1021         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1022         struct ehci_qh          *qh;
1023         int                     eptype = usb_endpoint_type(&ep->desc);
1024         int                     epnum = usb_endpoint_num(&ep->desc);
1025         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1026         unsigned long           flags;
1027
1028         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1029                 return;
1030
1031         spin_lock_irqsave(&ehci->lock, flags);
1032         qh = ep->hcpriv;
1033
1034         /* For Bulk and Interrupt endpoints we maintain the toggle state
1035          * in the hardware; the toggle bits in udev aren't used at all.
1036          * When an endpoint is reset by usb_clear_halt() we must reset
1037          * the toggle bit in the QH.
1038          */
1039         if (qh) {
1040                 if (!list_empty(&qh->qtd_list)) {
1041                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1042                 } else {
1043                         /* The toggle value in the QH can't be updated
1044                          * while the QH is active.  Unlink it now;
1045                          * re-linking will call qh_refresh().
1046                          */
1047                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1048                         qh->unlink_reason |= QH_UNLINK_REQUESTED;
1049                         if (eptype == USB_ENDPOINT_XFER_BULK)
1050                                 start_unlink_async(ehci, qh);
1051                         else
1052                                 start_unlink_intr(ehci, qh);
1053                 }
1054         }
1055         spin_unlock_irqrestore(&ehci->lock, flags);
1056 }
1057
1058 static int ehci_get_frame (struct usb_hcd *hcd)
1059 {
1060         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1061         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1062 }
1063
1064 /*-------------------------------------------------------------------------*/
1065
1066 /* Device addition and removal */
1067
1068 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1069 {
1070         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1071
1072         spin_lock_irq(&ehci->lock);
1073         drop_tt(udev);
1074         spin_unlock_irq(&ehci->lock);
1075 }
1076
1077 /*-------------------------------------------------------------------------*/
1078
1079 #ifdef  CONFIG_PM
1080
1081 /* suspend/resume, section 4.3 */
1082
1083 /* These routines handle the generic parts of controller suspend/resume */
1084
1085 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1086 {
1087         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1088
1089         if (time_before(jiffies, ehci->next_statechange))
1090                 msleep(10);
1091
1092         /*
1093          * Root hub was already suspended.  Disable IRQ emission and
1094          * mark HW unaccessible.  The PM and USB cores make sure that
1095          * the root hub is either suspended or stopped.
1096          */
1097         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1098
1099         spin_lock_irq(&ehci->lock);
1100         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1101         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1102
1103         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1104         spin_unlock_irq(&ehci->lock);
1105
1106         synchronize_irq(hcd->irq);
1107
1108         /* Check for race with a wakeup request */
1109         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1110                 ehci_resume(hcd, false);
1111                 return -EBUSY;
1112         }
1113
1114         return 0;
1115 }
1116 EXPORT_SYMBOL_GPL(ehci_suspend);
1117
1118 /* Returns 0 if power was preserved, 1 if power was lost */
1119 int ehci_resume(struct usb_hcd *hcd, bool force_reset)
1120 {
1121         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1122
1123         if (time_before(jiffies, ehci->next_statechange))
1124                 msleep(100);
1125
1126         /* Mark hardware accessible again as we are back to full power by now */
1127         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1128
1129         if (ehci->shutdown)
1130                 return 0;               /* Controller is dead */
1131
1132         /*
1133          * If CF is still set and reset isn't forced
1134          * then we maintained suspend power.
1135          * Just undo the effect of ehci_suspend().
1136          */
1137         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1138                         !force_reset) {
1139                 int     mask = INTR_MASK;
1140
1141                 ehci_prepare_ports_for_controller_resume(ehci);
1142
1143                 spin_lock_irq(&ehci->lock);
1144                 if (ehci->shutdown)
1145                         goto skip;
1146
1147                 if (!hcd->self.root_hub->do_remote_wakeup)
1148                         mask &= ~STS_PCD;
1149                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1150                 ehci_readl(ehci, &ehci->regs->intr_enable);
1151  skip:
1152                 spin_unlock_irq(&ehci->lock);
1153                 return 0;
1154         }
1155
1156         /*
1157          * Else reset, to cope with power loss or resume from hibernation
1158          * having let the firmware kick in during reboot.
1159          */
1160         usb_root_hub_lost_power(hcd->self.root_hub);
1161         (void) ehci_halt(ehci);
1162         (void) ehci_reset(ehci);
1163
1164         spin_lock_irq(&ehci->lock);
1165         if (ehci->shutdown)
1166                 goto skip;
1167
1168         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1169         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1170         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1171
1172         ehci->rh_state = EHCI_RH_SUSPENDED;
1173         spin_unlock_irq(&ehci->lock);
1174
1175         return 1;
1176 }
1177 EXPORT_SYMBOL_GPL(ehci_resume);
1178
1179 #endif
1180
1181 /*-------------------------------------------------------------------------*/
1182
1183 /*
1184  * Generic structure: This gets copied for platform drivers so that
1185  * individual entries can be overridden as needed.
1186  */
1187
1188 static const struct hc_driver ehci_hc_driver = {
1189         .description =          hcd_name,
1190         .product_desc =         "EHCI Host Controller",
1191         .hcd_priv_size =        sizeof(struct ehci_hcd),
1192
1193         /*
1194          * generic hardware linkage
1195          */
1196         .irq =                  ehci_irq,
1197         .flags =                HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
1198
1199         /*
1200          * basic lifecycle operations
1201          */
1202         .reset =                ehci_setup,
1203         .start =                ehci_run,
1204         .stop =                 ehci_stop,
1205         .shutdown =             ehci_shutdown,
1206
1207         /*
1208          * managing i/o requests and associated device resources
1209          */
1210         .urb_enqueue =          ehci_urb_enqueue,
1211         .urb_dequeue =          ehci_urb_dequeue,
1212         .endpoint_disable =     ehci_endpoint_disable,
1213         .endpoint_reset =       ehci_endpoint_reset,
1214         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1215
1216         /*
1217          * scheduling support
1218          */
1219         .get_frame_number =     ehci_get_frame,
1220
1221         /*
1222          * root hub support
1223          */
1224         .hub_status_data =      ehci_hub_status_data,
1225         .hub_control =          ehci_hub_control,
1226         .bus_suspend =          ehci_bus_suspend,
1227         .bus_resume =           ehci_bus_resume,
1228         .relinquish_port =      ehci_relinquish_port,
1229         .port_handed_over =     ehci_port_handed_over,
1230         .get_resuming_ports =   ehci_get_resuming_ports,
1231
1232         /*
1233          * device support
1234          */
1235         .free_dev =             ehci_remove_device,
1236 };
1237
1238 void ehci_init_driver(struct hc_driver *drv,
1239                 const struct ehci_driver_overrides *over)
1240 {
1241         /* Copy the generic table to drv and then apply the overrides */
1242         *drv = ehci_hc_driver;
1243
1244         if (over) {
1245                 drv->hcd_priv_size += over->extra_priv_size;
1246                 if (over->reset)
1247                         drv->reset = over->reset;
1248                 if (over->port_power)
1249                         drv->port_power = over->port_power;
1250         }
1251 }
1252 EXPORT_SYMBOL_GPL(ehci_init_driver);
1253
1254 /*-------------------------------------------------------------------------*/
1255
1256 MODULE_DESCRIPTION(DRIVER_DESC);
1257 MODULE_AUTHOR (DRIVER_AUTHOR);
1258 MODULE_LICENSE ("GPL");
1259
1260 #ifdef CONFIG_USB_EHCI_SH
1261 #include "ehci-sh.c"
1262 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1263 #endif
1264
1265 #ifdef CONFIG_PPC_PS3
1266 #include "ehci-ps3.c"
1267 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1268 #endif
1269
1270 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1271 #include "ehci-ppc-of.c"
1272 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1273 #endif
1274
1275 #ifdef CONFIG_XPS_USB_HCD_XILINX
1276 #include "ehci-xilinx-of.c"
1277 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1278 #endif
1279
1280 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1281 #include "ehci-pmcmsp.c"
1282 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1283 #endif
1284
1285 #ifdef CONFIG_SPARC_LEON
1286 #include "ehci-grlib.c"
1287 #define PLATFORM_DRIVER         ehci_grlib_driver
1288 #endif
1289
1290 static int __init ehci_hcd_init(void)
1291 {
1292         int retval = 0;
1293
1294         if (usb_disabled())
1295                 return -ENODEV;
1296
1297         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1298         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1299         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1300                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1301                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1302                                 " before uhci_hcd and ohci_hcd, not after\n");
1303
1304         pr_debug("%s: block sizes: qh %zd qtd %zd itd %zd sitd %zd\n",
1305                  hcd_name,
1306                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1307                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1308
1309 #ifdef CONFIG_DYNAMIC_DEBUG
1310         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1311 #endif
1312
1313 #ifdef PLATFORM_DRIVER
1314         retval = platform_driver_register(&PLATFORM_DRIVER);
1315         if (retval < 0)
1316                 goto clean0;
1317 #endif
1318
1319 #ifdef PS3_SYSTEM_BUS_DRIVER
1320         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1321         if (retval < 0)
1322                 goto clean2;
1323 #endif
1324
1325 #ifdef OF_PLATFORM_DRIVER
1326         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1327         if (retval < 0)
1328                 goto clean3;
1329 #endif
1330
1331 #ifdef XILINX_OF_PLATFORM_DRIVER
1332         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1333         if (retval < 0)
1334                 goto clean4;
1335 #endif
1336         return retval;
1337
1338 #ifdef XILINX_OF_PLATFORM_DRIVER
1339         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1340 clean4:
1341 #endif
1342 #ifdef OF_PLATFORM_DRIVER
1343         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1344 clean3:
1345 #endif
1346 #ifdef PS3_SYSTEM_BUS_DRIVER
1347         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1348 clean2:
1349 #endif
1350 #ifdef PLATFORM_DRIVER
1351         platform_driver_unregister(&PLATFORM_DRIVER);
1352 clean0:
1353 #endif
1354 #ifdef CONFIG_DYNAMIC_DEBUG
1355         debugfs_remove(ehci_debug_root);
1356         ehci_debug_root = NULL;
1357 #endif
1358         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1359         return retval;
1360 }
1361 module_init(ehci_hcd_init);
1362
1363 static void __exit ehci_hcd_cleanup(void)
1364 {
1365 #ifdef XILINX_OF_PLATFORM_DRIVER
1366         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1367 #endif
1368 #ifdef OF_PLATFORM_DRIVER
1369         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1370 #endif
1371 #ifdef PLATFORM_DRIVER
1372         platform_driver_unregister(&PLATFORM_DRIVER);
1373 #endif
1374 #ifdef PS3_SYSTEM_BUS_DRIVER
1375         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1376 #endif
1377 #ifdef CONFIG_DYNAMIC_DEBUG
1378         debugfs_remove(ehci_debug_root);
1379 #endif
1380         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1381 }
1382 module_exit(ehci_hcd_cleanup);