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         int                     rc;
 578
 579         hcd->uses_new_polling = 1;
 580
 581         /* EHCI spec section 4.1 */
 582
 583         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 584         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
 585
 586         /*
 587          * hcc_params controls whether ehci->regs->segment must (!!!)
 588          * be used; it constrains QH/ITD/SITD and QTD locations.
 589          * dma_pool consistent memory always uses segment zero.
 590          * streaming mappings for I/O buffers, like pci_map_single(),
 591          * can return segments above 4GB, if the device allows.
 592          *
 593          * NOTE:  the dma mask is visible through dev->dma_mask, so
 594          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 595          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 596          * host side drivers though.
 597          */
 598         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 599         if (HCC_64BIT_ADDR(hcc_params)) {
 600                 ehci_writel(ehci, 0, &ehci->regs->segment);
 601 #if 0
 602 // this is deeply broken on almost all architectures
 603                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
 604                         ehci_info(ehci, "enabled 64bit DMA\n");
 605 #endif
 606         }
 607
 608
 609         // Philips, Intel, and maybe others need CMD_RUN before the
 610         // root hub will detect new devices (why?); NEC doesn't
 611         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
 612         ehci->command |= CMD_RUN;
 613         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 614         dbg_cmd (ehci, "init", ehci->command);
 615
 616         /*
 617          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
 618          * are explicitly handed to companion controller(s), so no TT is
 619          * involved with the root hub.  (Except where one is integrated,
 620          * and there's no companion controller unless maybe for USB OTG.)
 621          *
 622          * Turning on the CF flag will transfer ownership of all ports
 623          * from the companions to the EHCI controller.  If any of the
 624          * companions are in the middle of a port reset at the time, it
 625          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
 626          * guarantees that no resets are in progress.  After we set CF,
 627          * a short delay lets the hardware catch up; new resets shouldn't
 628          * be started before the port switching actions could complete.
 629          */
 630         down_write(&ehci_cf_port_reset_rwsem);
 631         ehci->rh_state = EHCI_RH_RUNNING;
 632         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 633
 634         /* Wait until HC become operational */
 635         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 636         msleep(5);
 637
 638         /* For Aspeed, STS_HALT also depends on ASS/PSS status.
 639          * Check CMD_RUN instead.
 640          */
 641         if (ehci->is_aspeed)
 642                 rc = ehci_handshake(ehci, &ehci->regs->command, CMD_RUN,
 643                                     1, 100 * 1000);
 644         else
 645                 rc = ehci_handshake(ehci, &ehci->regs->status, STS_HALT,
 646                                     0, 100 * 1000);
 647
 648         up_write(&ehci_cf_port_reset_rwsem);
 649
 650         if (rc) {
 651                 ehci_err(ehci, "USB %x.%x, controller refused to start: %d\n",
 652                          ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f), rc);
 653                 return rc;
 654         }
 655
 656         ehci->last_periodic_enable = ktime_get_real();
 657
 658         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 659         ehci_info (ehci,
 660                 "USB %x.%x started, EHCI %x.%02x%s\n",
 661                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
 662                 temp >> 8, temp & 0xff,
 663                 ignore_oc ? ", overcurrent ignored" : "");
 664
 665         ehci_writel(ehci, INTR_MASK,
 666                     &ehci->regs->intr_enable); /* Turn On Interrupts */
 667
 668         /* GRR this is run-once init(), being done every time the HC starts.
 669          * So long as they're part of class devices, we can't do it init()
 670          * since the class device isn't created that early.
 671          */
 672         create_debug_files(ehci);
 673         create_sysfs_files(ehci);
 674
 675         return 0;
 676 }
 677
 678 int ehci_setup(struct usb_hcd *hcd)
 679 {
 680         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 681         int retval;
 682
 683         ehci->regs = (void __iomem *)ehci->caps +
 684             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 685         dbg_hcs_params(ehci, "reset");
 686         dbg_hcc_params(ehci, "reset");
 687
 688         /* cache this readonly data; minimize chip reads */
 689         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 690
 691         ehci->sbrn = HCD_USB2;
 692
 693         /* data structure init */
 694         retval = ehci_init(hcd);
 695         if (retval)
 696                 return retval;
 697
 698         retval = ehci_halt(ehci);
 699         if (retval) {
 700                 ehci_mem_cleanup(ehci);
 701                 return retval;
 702         }
 703
 704         ehci_reset(ehci);
 705
 706         return 0;
 707 }
 708 EXPORT_SYMBOL_GPL(ehci_setup);
 709
 710 /*-------------------------------------------------------------------------*/
 711
 712 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 713 {
 714         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 715         u32                     status, current_status, masked_status, pcd_status = 0;
 716         u32                     cmd;
 717         int                     bh;
 718         unsigned long           flags;
 719
 720         /*
 721          * For threadirqs option we use spin_lock_irqsave() variant to prevent
 722          * deadlock with ehci hrtimer callback, because hrtimer callbacks run
 723          * in interrupt context even when threadirqs is specified. We can go
 724          * back to spin_lock() variant when hrtimer callbacks become threaded.
 725          */
 726         spin_lock_irqsave(&ehci->lock, flags);
 727
 728         status = 0;
 729         current_status = ehci_readl(ehci, &ehci->regs->status);
 730 restart:
 731
 732         /* e.g. cardbus physical eject */
 733         if (current_status == ~(u32) 0) {
 734                 ehci_dbg (ehci, "device removed\n");
 735                 goto dead;
 736         }
 737         status |= current_status;
 738
 739         /*
 740          * We don't use STS_FLR, but some controllers don't like it to
 741          * remain on, so mask it out along with the other status bits.
 742          */
 743         masked_status = current_status & (INTR_MASK | STS_FLR);
 744
 745         /* Shared IRQ? */
 746         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
 747                 spin_unlock_irqrestore(&ehci->lock, flags);
 748                 return IRQ_NONE;
 749         }
 750
 751         /* clear (just) interrupts */
 752         ehci_writel(ehci, masked_status, &ehci->regs->status);
 753
 754         /* For edge interrupts, don't race with an interrupt bit being raised */
 755         current_status = ehci_readl(ehci, &ehci->regs->status);
 756         if (current_status & INTR_MASK)
 757                 goto restart;
 758
 759         cmd = ehci_readl(ehci, &ehci->regs->command);
 760         bh = 0;
 761
 762         /* normal [4.15.1.2] or error [4.15.1.1] completion */
 763         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
 764                 if (likely ((status & STS_ERR) == 0))
 765                         INCR(ehci->stats.normal);
 766                 else
 767                         INCR(ehci->stats.error);
 768                 bh = 1;
 769         }
 770
 771         /* complete the unlinking of some qh [4.15.2.3] */
 772         if (status & STS_IAA) {
 773
 774                 /* Turn off the IAA watchdog */
 775                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
 776
 777                 /*
 778                  * Mild optimization: Allow another IAAD to reset the
 779                  * hrtimer, if one occurs before the next expiration.
 780                  * In theory we could always cancel the hrtimer, but
 781                  * tests show that about half the time it will be reset
 782                  * for some other event anyway.
 783                  */
 784                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
 785                         ++ehci->next_hrtimer_event;
 786
 787                 /* guard against (alleged) silicon errata */
 788                 if (cmd & CMD_IAAD)
 789                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
 790                 if (ehci->iaa_in_progress)
 791                         INCR(ehci->stats.iaa);
 792                 end_iaa_cycle(ehci);
 793         }
 794
 795         /* remote wakeup [4.3.1] */
 796         if (status & STS_PCD) {
 797                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
 798                 u32             ppcd = ~0;
 799
 800                 /* kick root hub later */
 801                 pcd_status = status;
 802
 803                 /* resume root hub? */
 804                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
 805                         usb_hcd_resume_root_hub(hcd);
 806
 807                 /* get per-port change detect bits */
 808                 if (ehci->has_ppcd)
 809                         ppcd = status >> 16;
 810
 811                 while (i--) {
 812                         int pstatus;
 813
 814                         /* leverage per-port change bits feature */
 815                         if (!(ppcd & (1 << i)))
 816                                 continue;
 817                         pstatus = ehci_readl(ehci,
 818                                          &ehci->regs->port_status[i]);
 819
 820                         if (pstatus & PORT_OWNER)
 821                                 continue;
 822                         if (!(test_bit(i, &ehci->suspended_ports) &&
 823                                         ((pstatus & PORT_RESUME) ||
 824                                                 !(pstatus & PORT_SUSPEND)) &&
 825                                         (pstatus & PORT_PE) &&
 826                                         ehci->reset_done[i] == 0))
 827                                 continue;
 828
 829                         /* start USB_RESUME_TIMEOUT msec resume signaling from
 830                          * this port, and make hub_wq collect
 831                          * PORT_STAT_C_SUSPEND to stop that signaling.
 832                          */
 833                         ehci->reset_done[i] = jiffies +
 834                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
 835                         set_bit(i, &ehci->resuming_ports);
 836                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
 837                         usb_hcd_start_port_resume(&hcd->self, i);
 838                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
 839                 }
 840         }
 841
 842         /* PCI errors [4.15.2.4] */
 843         if (unlikely ((status & STS_FATAL) != 0)) {
 844                 ehci_err(ehci, "fatal error\n");
 845                 dbg_cmd(ehci, "fatal", cmd);
 846                 dbg_status(ehci, "fatal", status);
 847 dead:
 848                 usb_hc_died(hcd);
 849
 850                 /* Don't let the controller do anything more */
 851                 ehci->shutdown = true;
 852                 ehci->rh_state = EHCI_RH_STOPPING;
 853                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
 854                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 855                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 856                 ehci_handle_controller_death(ehci);
 857
 858                 /* Handle completions when the controller stops */
 859                 bh = 0;
 860         }
 861
 862         if (bh)
 863                 ehci_work (ehci);
 864         spin_unlock_irqrestore(&ehci->lock, flags);
 865         if (pcd_status)
 866                 usb_hcd_poll_rh_status(hcd);
 867         return IRQ_HANDLED;
 868 }
 869
 870 /*-------------------------------------------------------------------------*/
 871
 872 /*
 873  * non-error returns are a promise to giveback() the urb later
 874  * we drop ownership so next owner (or urb unlink) can get it
 875  *
 876  * urb + dev is in hcd.self.controller.urb_list
 877  * we're queueing TDs onto software and hardware lists
 878  *
 879  * hcd-specific init for hcpriv hasn't been done yet
 880  *
 881  * NOTE:  control, bulk, and interrupt share the same code to append TDs
 882  * to a (possibly active) QH, and the same QH scanning code.
 883  */
 884 static int ehci_urb_enqueue (
 885         struct usb_hcd  *hcd,
 886         struct urb      *urb,
 887         gfp_t           mem_flags
 888 ) {
 889         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 890         struct list_head        qtd_list;
 891
 892         INIT_LIST_HEAD (&qtd_list);
 893
 894         switch (usb_pipetype (urb->pipe)) {
 895         case PIPE_CONTROL:
 896                 /* qh_completions() code doesn't handle all the fault cases
 897                  * in multi-TD control transfers.  Even 1KB is rare anyway.
 898                  */
 899                 if (urb->transfer_buffer_length > (16 * 1024))
 900                         return -EMSGSIZE;
 901                 /* FALLTHROUGH */
 902         /* case PIPE_BULK: */
 903         default:
 904                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 905                         return -ENOMEM;
 906                 return submit_async(ehci, urb, &qtd_list, mem_flags);
 907
 908         case PIPE_INTERRUPT:
 909                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 910                         return -ENOMEM;
 911                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
 912
 913         case PIPE_ISOCHRONOUS:
 914                 if (urb->dev->speed == USB_SPEED_HIGH)
 915                         return itd_submit (ehci, urb, mem_flags);
 916                 else
 917                         return sitd_submit (ehci, urb, mem_flags);
 918         }
 919 }
 920
 921 /* remove from hardware lists
 922  * completions normally happen asynchronously
 923  */
 924
 925 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 926 {
 927         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 928         struct ehci_qh          *qh;
 929         unsigned long           flags;
 930         int                     rc;
 931
 932         spin_lock_irqsave (&ehci->lock, flags);
 933         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
 934         if (rc)
 935                 goto done;
 936
 937         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 938                 /*
 939                  * We don't expedite dequeue for isochronous URBs.
 940                  * Just wait until they complete normally or their
 941                  * time slot expires.
 942                  */
 943         } else {
 944                 qh = (struct ehci_qh *) urb->hcpriv;
 945                 qh->unlink_reason |= QH_UNLINK_REQUESTED;
 946                 switch (qh->qh_state) {
 947                 case QH_STATE_LINKED:
 948                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
 949                                 start_unlink_intr(ehci, qh);
 950                         else
 951                                 start_unlink_async(ehci, qh);
 952                         break;
 953                 case QH_STATE_COMPLETING:
 954                         qh->dequeue_during_giveback = 1;
 955                         break;
 956                 case QH_STATE_UNLINK:
 957                 case QH_STATE_UNLINK_WAIT:
 958                         /* already started */
 959                         break;
 960                 case QH_STATE_IDLE:
 961                         /* QH might be waiting for a Clear-TT-Buffer */
 962                         qh_completions(ehci, qh);
 963                         break;
 964                 }
 965         }
 966 done:
 967         spin_unlock_irqrestore (&ehci->lock, flags);
 968         return rc;
 969 }
 970
 971 /*-------------------------------------------------------------------------*/
 972
 973 // bulk qh holds the data toggle
 974
 975 static void
 976 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 977 {
 978         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 979         unsigned long           flags;
 980         struct ehci_qh          *qh;
 981
 982         /* ASSERT:  any requests/urbs are being unlinked */
 983         /* ASSERT:  nobody can be submitting urbs for this any more */
 984
 985 rescan:
 986         spin_lock_irqsave (&ehci->lock, flags);
 987         qh = ep->hcpriv;
 988         if (!qh)
 989                 goto done;
 990
 991         /* endpoints can be iso streams.  for now, we don't
 992          * accelerate iso completions ... so spin a while.
 993          */
 994         if (qh->hw == NULL) {
 995                 struct ehci_iso_stream  *stream = ep->hcpriv;
 996
 997                 if (!list_empty(&stream->td_list))
 998                         goto idle_timeout;
 999
1000                 /* BUG_ON(!list_empty(&stream->free_list)); */
1001                 reserve_release_iso_bandwidth(ehci, stream, -1);
1002                 kfree(stream);
1003                 goto done;
1004         }
1005
1006         qh->unlink_reason |= QH_UNLINK_REQUESTED;
1007         switch (qh->qh_state) {
1008         case QH_STATE_LINKED:
1009                 if (list_empty(&qh->qtd_list))
1010                         qh->unlink_reason |= QH_UNLINK_QUEUE_EMPTY;
1011                 else
1012                         WARN_ON(1);
1013                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
1014                         start_unlink_async(ehci, qh);
1015                 else
1016                         start_unlink_intr(ehci, qh);
1017                 fallthrough;
1018         case QH_STATE_COMPLETING:       /* already in unlinking */
1019         case QH_STATE_UNLINK:           /* wait for hw to finish? */
1020         case QH_STATE_UNLINK_WAIT:
1021 idle_timeout:
1022                 spin_unlock_irqrestore (&ehci->lock, flags);
1023                 schedule_timeout_uninterruptible(1);
1024                 goto rescan;
1025         case QH_STATE_IDLE:             /* fully unlinked */
1026                 if (qh->clearing_tt)
1027                         goto idle_timeout;
1028                 if (list_empty (&qh->qtd_list)) {
1029                         if (qh->ps.bw_uperiod)
1030                                 reserve_release_intr_bandwidth(ehci, qh, -1);
1031                         qh_destroy(ehci, qh);
1032                         break;
1033                 }
1034                 fallthrough;
1035         default:
1036                 /* caller was supposed to have unlinked any requests;
1037                  * that's not our job.  just leak this memory.
1038                  */
1039                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1040                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1041                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1042                 break;
1043         }
1044  done:
1045         ep->hcpriv = NULL;
1046         spin_unlock_irqrestore (&ehci->lock, flags);
1047 }
1048
1049 static void
1050 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1051 {
1052         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1053         struct ehci_qh          *qh;
1054         int                     eptype = usb_endpoint_type(&ep->desc);
1055         int                     epnum = usb_endpoint_num(&ep->desc);
1056         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1057         unsigned long           flags;
1058
1059         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1060                 return;
1061
1062         spin_lock_irqsave(&ehci->lock, flags);
1063         qh = ep->hcpriv;
1064
1065         /* For Bulk and Interrupt endpoints we maintain the toggle state
1066          * in the hardware; the toggle bits in udev aren't used at all.
1067          * When an endpoint is reset by usb_clear_halt() we must reset
1068          * the toggle bit in the QH.
1069          */
1070         if (qh) {
1071                 if (!list_empty(&qh->qtd_list)) {
1072                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1073                 } else {
1074                         /* The toggle value in the QH can't be updated
1075                          * while the QH is active.  Unlink it now;
1076                          * re-linking will call qh_refresh().
1077                          */
1078                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1079                         qh->unlink_reason |= QH_UNLINK_REQUESTED;
1080                         if (eptype == USB_ENDPOINT_XFER_BULK)
1081                                 start_unlink_async(ehci, qh);
1082                         else
1083                                 start_unlink_intr(ehci, qh);
1084                 }
1085         }
1086         spin_unlock_irqrestore(&ehci->lock, flags);
1087 }
1088
1089 static int ehci_get_frame (struct usb_hcd *hcd)
1090 {
1091         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1092         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1093 }
1094
1095 /*-------------------------------------------------------------------------*/
1096
1097 /* Device addition and removal */
1098
1099 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1100 {
1101         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1102
1103         spin_lock_irq(&ehci->lock);
1104         drop_tt(udev);
1105         spin_unlock_irq(&ehci->lock);
1106 }
1107
1108 /*-------------------------------------------------------------------------*/
1109
1110 #ifdef  CONFIG_PM
1111
1112 /* suspend/resume, section 4.3 */
1113
1114 /* These routines handle the generic parts of controller suspend/resume */
1115
1116 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1117 {
1118         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1119
1120         if (time_before(jiffies, ehci->next_statechange))
1121                 msleep(10);
1122
1123         /*
1124          * Root hub was already suspended.  Disable IRQ emission and
1125          * mark HW unaccessible.  The PM and USB cores make sure that
1126          * the root hub is either suspended or stopped.
1127          */
1128         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1129
1130         spin_lock_irq(&ehci->lock);
1131         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1132         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1133
1134         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1135         spin_unlock_irq(&ehci->lock);
1136
1137         synchronize_irq(hcd->irq);
1138
1139         /* Check for race with a wakeup request */
1140         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1141                 ehci_resume(hcd, false);
1142                 return -EBUSY;
1143         }
1144
1145         return 0;
1146 }
1147 EXPORT_SYMBOL_GPL(ehci_suspend);
1148
1149 /* Returns 0 if power was preserved, 1 if power was lost */
1150 int ehci_resume(struct usb_hcd *hcd, bool force_reset)
1151 {
1152         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1153
1154         if (time_before(jiffies, ehci->next_statechange))
1155                 msleep(100);
1156
1157         /* Mark hardware accessible again as we are back to full power by now */
1158         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1159
1160         if (ehci->shutdown)
1161                 return 0;               /* Controller is dead */
1162
1163         /*
1164          * If CF is still set and reset isn't forced
1165          * then we maintained suspend power.
1166          * Just undo the effect of ehci_suspend().
1167          */
1168         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1169                         !force_reset) {
1170                 int     mask = INTR_MASK;
1171
1172                 ehci_prepare_ports_for_controller_resume(ehci);
1173
1174                 spin_lock_irq(&ehci->lock);
1175                 if (ehci->shutdown)
1176                         goto skip;
1177
1178                 if (!hcd->self.root_hub->do_remote_wakeup)
1179                         mask &= ~STS_PCD;
1180                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1181                 ehci_readl(ehci, &ehci->regs->intr_enable);
1182  skip:
1183                 spin_unlock_irq(&ehci->lock);
1184                 return 0;
1185         }
1186
1187         /*
1188          * Else reset, to cope with power loss or resume from hibernation
1189          * having let the firmware kick in during reboot.
1190          */
1191         usb_root_hub_lost_power(hcd->self.root_hub);
1192         (void) ehci_halt(ehci);
1193         (void) ehci_reset(ehci);
1194
1195         spin_lock_irq(&ehci->lock);
1196         if (ehci->shutdown)
1197                 goto skip;
1198
1199         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1200         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1201         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1202
1203         ehci->rh_state = EHCI_RH_SUSPENDED;
1204         spin_unlock_irq(&ehci->lock);
1205
1206         return 1;
1207 }
1208 EXPORT_SYMBOL_GPL(ehci_resume);
1209
1210 #endif
1211
1212 /*-------------------------------------------------------------------------*/
1213
1214 /*
1215  * Generic structure: This gets copied for platform drivers so that
1216  * individual entries can be overridden as needed.
1217  */
1218
1219 static const struct hc_driver ehci_hc_driver = {
1220         .description =          hcd_name,
1221         .product_desc =         "EHCI Host Controller",
1222         .hcd_priv_size =        sizeof(struct ehci_hcd),
1223
1224         /*
1225          * generic hardware linkage
1226          */
1227         .irq =                  ehci_irq,
1228         .flags =                HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
1229
1230         /*
1231          * basic lifecycle operations
1232          */
1233         .reset =                ehci_setup,
1234         .start =                ehci_run,
1235         .stop =                 ehci_stop,
1236         .shutdown =             ehci_shutdown,
1237
1238         /*
1239          * managing i/o requests and associated device resources
1240          */
1241         .urb_enqueue =          ehci_urb_enqueue,
1242         .urb_dequeue =          ehci_urb_dequeue,
1243         .endpoint_disable =     ehci_endpoint_disable,
1244         .endpoint_reset =       ehci_endpoint_reset,
1245         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1246
1247         /*
1248          * scheduling support
1249          */
1250         .get_frame_number =     ehci_get_frame,
1251
1252         /*
1253          * root hub support
1254          */
1255         .hub_status_data =      ehci_hub_status_data,
1256         .hub_control =          ehci_hub_control,
1257         .bus_suspend =          ehci_bus_suspend,
1258         .bus_resume =           ehci_bus_resume,
1259         .relinquish_port =      ehci_relinquish_port,
1260         .port_handed_over =     ehci_port_handed_over,
1261         .get_resuming_ports =   ehci_get_resuming_ports,
1262
1263         /*
1264          * device support
1265          */
1266         .free_dev =             ehci_remove_device,
1267 };
1268
1269 void ehci_init_driver(struct hc_driver *drv,
1270                 const struct ehci_driver_overrides *over)
1271 {
1272         /* Copy the generic table to drv and then apply the overrides */
1273         *drv = ehci_hc_driver;
1274
1275         if (over) {
1276                 drv->hcd_priv_size += over->extra_priv_size;
1277                 if (over->reset)
1278                         drv->reset = over->reset;
1279                 if (over->port_power)
1280                         drv->port_power = over->port_power;
1281         }
1282 }
1283 EXPORT_SYMBOL_GPL(ehci_init_driver);
1284
1285 /*-------------------------------------------------------------------------*/
1286
1287 MODULE_DESCRIPTION(DRIVER_DESC);
1288 MODULE_AUTHOR (DRIVER_AUTHOR);
1289 MODULE_LICENSE ("GPL");
1290
1291 #ifdef CONFIG_USB_EHCI_SH
1292 #include "ehci-sh.c"
1293 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1294 #endif
1295
1296 #ifdef CONFIG_PPC_PS3
1297 #include "ehci-ps3.c"
1298 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1299 #endif
1300
1301 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1302 #include "ehci-ppc-of.c"
1303 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1304 #endif
1305
1306 #ifdef CONFIG_XPS_USB_HCD_XILINX
1307 #include "ehci-xilinx-of.c"
1308 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1309 #endif
1310
1311 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1312 #include "ehci-pmcmsp.c"
1313 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1314 #endif
1315
1316 #ifdef CONFIG_SPARC_LEON
1317 #include "ehci-grlib.c"
1318 #define PLATFORM_DRIVER         ehci_grlib_driver
1319 #endif
1320
1321 static int __init ehci_hcd_init(void)
1322 {
1323         int retval = 0;
1324
1325         if (usb_disabled())
1326                 return -ENODEV;
1327
1328         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1329         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1330         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1331                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1332                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1333                                 " before uhci_hcd and ohci_hcd, not after\n");
1334
1335         pr_debug("%s: block sizes: qh %zd qtd %zd itd %zd sitd %zd\n",
1336                  hcd_name,
1337                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1338                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1339
1340 #ifdef CONFIG_DYNAMIC_DEBUG
1341         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1342 #endif
1343
1344 #ifdef PLATFORM_DRIVER
1345         retval = platform_driver_register(&PLATFORM_DRIVER);
1346         if (retval < 0)
1347                 goto clean0;
1348 #endif
1349
1350 #ifdef PS3_SYSTEM_BUS_DRIVER
1351         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1352         if (retval < 0)
1353                 goto clean2;
1354 #endif
1355
1356 #ifdef OF_PLATFORM_DRIVER
1357         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1358         if (retval < 0)
1359                 goto clean3;
1360 #endif
1361
1362 #ifdef XILINX_OF_PLATFORM_DRIVER
1363         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1364         if (retval < 0)
1365                 goto clean4;
1366 #endif
1367         return retval;
1368
1369 #ifdef XILINX_OF_PLATFORM_DRIVER
1370         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1371 clean4:
1372 #endif
1373 #ifdef OF_PLATFORM_DRIVER
1374         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1375 clean3:
1376 #endif
1377 #ifdef PS3_SYSTEM_BUS_DRIVER
1378         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1379 clean2:
1380 #endif
1381 #ifdef PLATFORM_DRIVER
1382         platform_driver_unregister(&PLATFORM_DRIVER);
1383 clean0:
1384 #endif
1385 #ifdef CONFIG_DYNAMIC_DEBUG
1386         debugfs_remove(ehci_debug_root);
1387         ehci_debug_root = NULL;
1388 #endif
1389         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1390         return retval;
1391 }
1392 module_init(ehci_hcd_init);
1393
1394 static void __exit ehci_hcd_cleanup(void)
1395 {
1396 #ifdef XILINX_OF_PLATFORM_DRIVER
1397         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1398 #endif
1399 #ifdef OF_PLATFORM_DRIVER
1400         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1401 #endif
1402 #ifdef PLATFORM_DRIVER
1403         platform_driver_unregister(&PLATFORM_DRIVER);
1404 #endif
1405 #ifdef PS3_SYSTEM_BUS_DRIVER
1406         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1407 #endif
1408 #ifdef CONFIG_DYNAMIC_DEBUG
1409         debugfs_remove(ehci_debug_root);
1410 #endif
1411         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1412 }
1413 module_exit(ehci_hcd_cleanup);