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/platform_device.h>
  30 #include <linux/slab.h>
  31
  32 #include <asm/byteorder.h>
  33 #include <asm/io.h>
  34 #include <asm/irq.h>
  35 #include <asm/unaligned.h>
  36
  37 #if defined(CONFIG_PPC_PS3)
  38 #include <asm/firmware.h>
  39 #endif
  40
  41 /*-------------------------------------------------------------------------*/
  42
  43 /*
  44  * EHCI hc_driver implementation ... experimental, incomplete.
  45  * Based on the final 1.0 register interface specification.
  46  *
  47  * USB 2.0 shows up in upcoming www.pcmcia.org technology.
  48  * First was PCMCIA, like ISA; then CardBus, which is PCI.
  49  * Next comes "CardBay", using USB 2.0 signals.
  50  *
  51  * Contains additional contributions by Brad Hards, Rory Bolt, and others.
  52  * Special thanks to Intel and VIA for providing host controllers to
  53  * test this driver on, and Cypress (including In-System Design) for
  54  * providing early devices for those host controllers to talk to!
  55  */
  56
  57 #define DRIVER_AUTHOR "David Brownell"
  58 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
  59
  60 static const char       hcd_name [] = "ehci_hcd";
  61
  62
  63 #undef EHCI_URB_TRACE
  64
  65 /* magic numbers that can affect system performance */
  66 #define EHCI_TUNE_CERR          3       /* 0-3 qtd retries; 0 == don't stop */
  67 #define EHCI_TUNE_RL_HS         4       /* nak throttle; see 4.9 */
  68 #define EHCI_TUNE_RL_TT         0
  69 #define EHCI_TUNE_MULT_HS       1       /* 1-3 transactions/uframe; 4.10.3 */
  70 #define EHCI_TUNE_MULT_TT       1
  71 /*
  72  * Some drivers think it's safe to schedule isochronous transfers more than
  73  * 256 ms into the future (partly as a result of an old bug in the scheduling
  74  * code).  In an attempt to avoid trouble, we will use a minimum scheduling
  75  * length of 512 frames instead of 256.
  76  */
  77 #define EHCI_TUNE_FLS           1       /* (medium) 512-frame schedule */
  78
  79 /* Initial IRQ latency:  faster than hw default */
  80 static int log2_irq_thresh;             // 0 to 6
  81 module_param (log2_irq_thresh, int, S_IRUGO);
  82 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
  83
  84 /* initial park setting:  slower than hw default */
  85 static unsigned park;
  86 module_param (park, uint, S_IRUGO);
  87 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
  88
  89 /* for flakey hardware, ignore overcurrent indicators */
  90 static bool ignore_oc;
  91 module_param (ignore_oc, bool, S_IRUGO);
  92 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
  93
  94 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
  95
  96 /*-------------------------------------------------------------------------*/
  97
  98 #include "ehci.h"
  99 #include "pci-quirks.h"
 100
 101 static void compute_tt_budget(u8 budget_table[EHCI_BANDWIDTH_SIZE],
 102                 struct ehci_tt *tt);
 103
 104 /*
 105  * The MosChip MCS9990 controller updates its microframe counter
 106  * a little before the frame counter, and occasionally we will read
 107  * the invalid intermediate value.  Avoid problems by checking the
 108  * microframe number (the low-order 3 bits); if they are 0 then
 109  * re-read the register to get the correct value.
 110  */
 111 static unsigned ehci_moschip_read_frame_index(struct ehci_hcd *ehci)
 112 {
 113         unsigned uf;
 114
 115         uf = ehci_readl(ehci, &ehci->regs->frame_index);
 116         if (unlikely((uf & 7) == 0))
 117                 uf = ehci_readl(ehci, &ehci->regs->frame_index);
 118         return uf;
 119 }
 120
 121 static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci)
 122 {
 123         if (ehci->frame_index_bug)
 124                 return ehci_moschip_read_frame_index(ehci);
 125         return ehci_readl(ehci, &ehci->regs->frame_index);
 126 }
 127
 128 #include "ehci-dbg.c"
 129
 130 /*-------------------------------------------------------------------------*/
 131
 132 /*
 133  * ehci_handshake - spin reading hc until handshake completes or fails
 134  * @ptr: address of hc register to be read
 135  * @mask: bits to look at in result of read
 136  * @done: value of those bits when handshake succeeds
 137  * @usec: timeout in microseconds
 138  *
 139  * Returns negative errno, or zero on success
 140  *
 141  * Success happens when the "mask" bits have the specified value (hardware
 142  * handshake done).  There are two failure modes:  "usec" have passed (major
 143  * hardware flakeout), or the register reads as all-ones (hardware removed).
 144  *
 145  * That last failure should_only happen in cases like physical cardbus eject
 146  * before driver shutdown. But it also seems to be caused by bugs in cardbus
 147  * bridge shutdown:  shutting down the bridge before the devices using it.
 148  */
 149 int ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
 150                    u32 mask, u32 done, int usec)
 151 {
 152         u32     result;
 153
 154         do {
 155                 result = ehci_readl(ehci, ptr);
 156                 if (result == ~(u32)0)          /* card removed */
 157                         return -ENODEV;
 158                 result &= mask;
 159                 if (result == done)
 160                         return 0;
 161                 udelay (1);
 162                 usec--;
 163         } while (usec > 0);
 164         return -ETIMEDOUT;
 165 }
 166 EXPORT_SYMBOL_GPL(ehci_handshake);
 167
 168 /* check TDI/ARC silicon is in host mode */
 169 static int tdi_in_host_mode (struct ehci_hcd *ehci)
 170 {
 171         u32             tmp;
 172
 173         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
 174         return (tmp & 3) == USBMODE_CM_HC;
 175 }
 176
 177 /*
 178  * Force HC to halt state from unknown (EHCI spec section 2.3).
 179  * Must be called with interrupts enabled and the lock not held.
 180  */
 181 static int ehci_halt (struct ehci_hcd *ehci)
 182 {
 183         u32     temp;
 184
 185         spin_lock_irq(&ehci->lock);
 186
 187         /* disable any irqs left enabled by previous code */
 188         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 189
 190         if (ehci_is_TDI(ehci) && !tdi_in_host_mode(ehci)) {
 191                 spin_unlock_irq(&ehci->lock);
 192                 return 0;
 193         }
 194
 195         /*
 196          * This routine gets called during probe before ehci->command
 197          * has been initialized, so we can't rely on its value.
 198          */
 199         ehci->command &= ~CMD_RUN;
 200         temp = ehci_readl(ehci, &ehci->regs->command);
 201         temp &= ~(CMD_RUN | CMD_IAAD);
 202         ehci_writel(ehci, temp, &ehci->regs->command);
 203
 204         spin_unlock_irq(&ehci->lock);
 205         synchronize_irq(ehci_to_hcd(ehci)->irq);
 206
 207         return ehci_handshake(ehci, &ehci->regs->status,
 208                           STS_HALT, STS_HALT, 16 * 125);
 209 }
 210
 211 /* put TDI/ARC silicon into EHCI mode */
 212 static void tdi_reset (struct ehci_hcd *ehci)
 213 {
 214         u32             tmp;
 215
 216         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
 217         tmp |= USBMODE_CM_HC;
 218         /* The default byte access to MMR space is LE after
 219          * controller reset. Set the required endian mode
 220          * for transfer buffers to match the host microprocessor
 221          */
 222         if (ehci_big_endian_mmio(ehci))
 223                 tmp |= USBMODE_BE;
 224         ehci_writel(ehci, tmp, &ehci->regs->usbmode);
 225 }
 226
 227 /*
 228  * Reset a non-running (STS_HALT == 1) controller.
 229  * Must be called with interrupts enabled and the lock not held.
 230  */
 231 int ehci_reset(struct ehci_hcd *ehci)
 232 {
 233         int     retval;
 234         u32     command = ehci_readl(ehci, &ehci->regs->command);
 235
 236         /* If the EHCI debug controller is active, special care must be
 237          * taken before and after a host controller reset */
 238         if (ehci->debug && !dbgp_reset_prep(ehci_to_hcd(ehci)))
 239                 ehci->debug = NULL;
 240
 241         command |= CMD_RESET;
 242         dbg_cmd (ehci, "reset", command);
 243         ehci_writel(ehci, command, &ehci->regs->command);
 244         ehci->rh_state = EHCI_RH_HALTED;
 245         ehci->next_statechange = jiffies;
 246         retval = ehci_handshake(ehci, &ehci->regs->command,
 247                             CMD_RESET, 0, 250 * 1000);
 248
 249         if (ehci->has_hostpc) {
 250                 ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
 251                                 &ehci->regs->usbmode_ex);
 252                 ehci_writel(ehci, TXFIFO_DEFAULT, &ehci->regs->txfill_tuning);
 253         }
 254         if (retval)
 255                 return retval;
 256
 257         if (ehci_is_TDI(ehci))
 258                 tdi_reset (ehci);
 259
 260         if (ehci->debug)
 261                 dbgp_external_startup(ehci_to_hcd(ehci));
 262
 263         ehci->port_c_suspend = ehci->suspended_ports =
 264                         ehci->resuming_ports = 0;
 265         return retval;
 266 }
 267 EXPORT_SYMBOL_GPL(ehci_reset);
 268
 269 /*
 270  * Idle the controller (turn off the schedules).
 271  * Must be called with interrupts enabled and the lock not held.
 272  */
 273 static void ehci_quiesce (struct ehci_hcd *ehci)
 274 {
 275         u32     temp;
 276
 277         if (ehci->rh_state != EHCI_RH_RUNNING)
 278                 return;
 279
 280         /* wait for any schedule enables/disables to take effect */
 281         temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
 282         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp,
 283                         16 * 125);
 284
 285         /* then disable anything that's still active */
 286         spin_lock_irq(&ehci->lock);
 287         ehci->command &= ~(CMD_ASE | CMD_PSE);
 288         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 289         spin_unlock_irq(&ehci->lock);
 290
 291         /* hardware can take 16 microframes to turn off ... */
 292         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0,
 293                         16 * 125);
 294 }
 295
 296 /*-------------------------------------------------------------------------*/
 297
 298 static void end_iaa_cycle(struct ehci_hcd *ehci);
 299 static void end_unlink_async(struct ehci_hcd *ehci);
 300 static void unlink_empty_async(struct ehci_hcd *ehci);
 301 static void ehci_work(struct ehci_hcd *ehci);
 302 static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 303 static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 304 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable);
 305
 306 #include "ehci-timer.c"
 307 #include "ehci-hub.c"
 308 #include "ehci-mem.c"
 309 #include "ehci-q.c"
 310 #include "ehci-sched.c"
 311 #include "ehci-sysfs.c"
 312
 313 /*-------------------------------------------------------------------------*/
 314
 315 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
 316  * The firmware seems to think that powering off is a wakeup event!
 317  * This routine turns off remote wakeup and everything else, on all ports.
 318  */
 319 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
 320 {
 321         int     port = HCS_N_PORTS(ehci->hcs_params);
 322
 323         while (port--) {
 324                 spin_unlock_irq(&ehci->lock);
 325                 ehci_port_power(ehci, port, false);
 326                 spin_lock_irq(&ehci->lock);
 327                 ehci_writel(ehci, PORT_RWC_BITS,
 328                                 &ehci->regs->port_status[port]);
 329         }
 330 }
 331
 332 /*
 333  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
 334  * Must be called with interrupts enabled and the lock not held.
 335  */
 336 static void ehci_silence_controller(struct ehci_hcd *ehci)
 337 {
 338         ehci_halt(ehci);
 339
 340         spin_lock_irq(&ehci->lock);
 341         ehci->rh_state = EHCI_RH_HALTED;
 342         ehci_turn_off_all_ports(ehci);
 343
 344         /* make BIOS/etc use companion controller during reboot */
 345         ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 346
 347         /* unblock posted writes */
 348         ehci_readl(ehci, &ehci->regs->configured_flag);
 349         spin_unlock_irq(&ehci->lock);
 350 }
 351
 352 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
 353  * This forcibly disables dma and IRQs, helping kexec and other cases
 354  * where the next system software may expect clean state.
 355  */
 356 static void ehci_shutdown(struct usb_hcd *hcd)
 357 {
 358         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 359
 360         /**
 361          * Protect the system from crashing at system shutdown in cases where
 362          * usb host is not added yet from OTG controller driver.
 363          * As ehci_setup() not done yet, so stop accessing registers or
 364          * variables initialized in ehci_setup()
 365          */
 366         if (!ehci->sbrn)
 367                 return;
 368
 369         spin_lock_irq(&ehci->lock);
 370         ehci->shutdown = true;
 371         ehci->rh_state = EHCI_RH_STOPPING;
 372         ehci->enabled_hrtimer_events = 0;
 373         spin_unlock_irq(&ehci->lock);
 374
 375         ehci_silence_controller(ehci);
 376
 377         hrtimer_cancel(&ehci->hrtimer);
 378 }
 379
 380 /*-------------------------------------------------------------------------*/
 381
 382 /*
 383  * ehci_work is called from some interrupts, timers, and so on.
 384  * it calls driver completion functions, after dropping ehci->lock.
 385  */
 386 static void ehci_work (struct ehci_hcd *ehci)
 387 {
 388         /* another CPU may drop ehci->lock during a schedule scan while
 389          * it reports urb completions.  this flag guards against bogus
 390          * attempts at re-entrant schedule scanning.
 391          */
 392         if (ehci->scanning) {
 393                 ehci->need_rescan = true;
 394                 return;
 395         }
 396         ehci->scanning = true;
 397
 398  rescan:
 399         ehci->need_rescan = false;
 400         if (ehci->async_count)
 401                 scan_async(ehci);
 402         if (ehci->intr_count > 0)
 403                 scan_intr(ehci);
 404         if (ehci->isoc_count > 0)
 405                 scan_isoc(ehci);
 406         if (ehci->need_rescan)
 407                 goto rescan;
 408         ehci->scanning = false;
 409
 410         /* the IO watchdog guards against hardware or driver bugs that
 411          * misplace IRQs, and should let us run completely without IRQs.
 412          * such lossage has been observed on both VT6202 and VT8235.
 413          */
 414         turn_on_io_watchdog(ehci);
 415 }
 416
 417 /*
 418  * Called when the ehci_hcd module is removed.
 419  */
 420 static void ehci_stop (struct usb_hcd *hcd)
 421 {
 422         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 423
 424         ehci_dbg (ehci, "stop\n");
 425
 426         /* no more interrupts ... */
 427
 428         spin_lock_irq(&ehci->lock);
 429         ehci->enabled_hrtimer_events = 0;
 430         spin_unlock_irq(&ehci->lock);
 431
 432         ehci_quiesce(ehci);
 433         ehci_silence_controller(ehci);
 434         ehci_reset (ehci);
 435
 436         hrtimer_cancel(&ehci->hrtimer);
 437         remove_sysfs_files(ehci);
 438         remove_debug_files (ehci);
 439
 440         /* root hub is shut down separately (first, when possible) */
 441         spin_lock_irq (&ehci->lock);
 442         end_free_itds(ehci);
 443         spin_unlock_irq (&ehci->lock);
 444         ehci_mem_cleanup (ehci);
 445
 446         if (ehci->amd_pll_fix == 1)
 447                 usb_amd_dev_put();
 448
 449         dbg_status (ehci, "ehci_stop completed",
 450                     ehci_readl(ehci, &ehci->regs->status));
 451 }
 452
 453 /* one-time init, only for memory state */
 454 static int ehci_init(struct usb_hcd *hcd)
 455 {
 456         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 457         u32                     temp;
 458         int                     retval;
 459         u32                     hcc_params;
 460         struct ehci_qh_hw       *hw;
 461
 462         spin_lock_init(&ehci->lock);
 463
 464         /*
 465          * keep io watchdog by default, those good HCDs could turn off it later
 466          */
 467         ehci->need_io_watchdog = 1;
 468
 469         hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 470         ehci->hrtimer.function = ehci_hrtimer_func;
 471         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 472
 473         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 474
 475         /*
 476          * by default set standard 80% (== 100 usec/uframe) max periodic
 477          * bandwidth as required by USB 2.0
 478          */
 479         ehci->uframe_periodic_max = 100;
 480
 481         /*
 482          * hw default: 1K periodic list heads, one per frame.
 483          * periodic_size can shrink by USBCMD update if hcc_params allows.
 484          */
 485         ehci->periodic_size = DEFAULT_I_TDPS;
 486         INIT_LIST_HEAD(&ehci->async_unlink);
 487         INIT_LIST_HEAD(&ehci->async_idle);
 488         INIT_LIST_HEAD(&ehci->intr_unlink_wait);
 489         INIT_LIST_HEAD(&ehci->intr_unlink);
 490         INIT_LIST_HEAD(&ehci->intr_qh_list);
 491         INIT_LIST_HEAD(&ehci->cached_itd_list);
 492         INIT_LIST_HEAD(&ehci->cached_sitd_list);
 493         INIT_LIST_HEAD(&ehci->tt_list);
 494
 495         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 496                 /* periodic schedule size can be smaller than default */
 497                 switch (EHCI_TUNE_FLS) {
 498                 case 0: ehci->periodic_size = 1024; break;
 499                 case 1: ehci->periodic_size = 512; break;
 500                 case 2: ehci->periodic_size = 256; break;
 501                 default:        BUG();
 502                 }
 503         }
 504         if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
 505                 return retval;
 506
 507         /* controllers may cache some of the periodic schedule ... */
 508         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
 509                 ehci->i_thresh = 0;
 510         else                                    // N microframes cached
 511                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
 512
 513         /*
 514          * dedicate a qh for the async ring head, since we couldn't unlink
 515          * a 'real' qh without stopping the async schedule [4.8].  use it
 516          * as the 'reclamation list head' too.
 517          * its dummy is used in hw_alt_next of many tds, to prevent the qh
 518          * from automatically advancing to the next td after short reads.
 519          */
 520         ehci->async->qh_next.qh = NULL;
 521         hw = ehci->async->hw;
 522         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
 523         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
 524 #if defined(CONFIG_PPC_PS3)
 525         hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE);
 526 #endif
 527         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
 528         hw->hw_qtd_next = EHCI_LIST_END(ehci);
 529         ehci->async->qh_state = QH_STATE_LINKED;
 530         hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
 531
 532         /* clear interrupt enables, set irq latency */
 533         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
 534                 log2_irq_thresh = 0;
 535         temp = 1 << (16 + log2_irq_thresh);
 536         if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) {
 537                 ehci->has_ppcd = 1;
 538                 ehci_dbg(ehci, "enable per-port change event\n");
 539                 temp |= CMD_PPCEE;
 540         }
 541         if (HCC_CANPARK(hcc_params)) {
 542                 /* HW default park == 3, on hardware that supports it (like
 543                  * NVidia and ALI silicon), maximizes throughput on the async
 544                  * schedule by avoiding QH fetches between transfers.
 545                  *
 546                  * With fast usb storage devices and NForce2, "park" seems to
 547                  * make problems:  throughput reduction (!), data errors...
 548                  */
 549                 if (park) {
 550                         park = min(park, (unsigned) 3);
 551                         temp |= CMD_PARK;
 552                         temp |= park << 8;
 553                 }
 554                 ehci_dbg(ehci, "park %d\n", park);
 555         }
 556         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
 557                 /* periodic schedule size can be smaller than default */
 558                 temp &= ~(3 << 2);
 559                 temp |= (EHCI_TUNE_FLS << 2);
 560         }
 561         ehci->command = temp;
 562
 563         /* Accept arbitrarily long scatter-gather lists */
 564         if (!hcd->localmem_pool)
 565                 hcd->self.sg_tablesize = ~0;
 566
 567         /* Prepare for unlinking active QHs */
 568         ehci->old_current = ~0;
 569         return 0;
 570 }
 571
 572 /* start HC running; it's halted, ehci_init() has been run (once) */
 573 static int ehci_run (struct usb_hcd *hcd)
 574 {
 575         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 576         u32                     temp;
 577         u32                     hcc_params;
 578         int                     rc;
 579
 580         hcd->uses_new_polling = 1;
 581
 582         /* EHCI spec section 4.1 */
 583
 584         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 585         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
 586
 587         /*
 588          * hcc_params controls whether ehci->regs->segment must (!!!)
 589          * be used; it constrains QH/ITD/SITD and QTD locations.
 590          * dma_pool consistent memory always uses segment zero.
 591          * streaming mappings for I/O buffers, like dma_map_single(),
 592          * can return segments above 4GB, if the device allows.
 593          *
 594          * NOTE:  the dma mask is visible through dev->dma_mask, so
 595          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 596          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 597          * host side drivers though.
 598          */
 599         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 600         if (HCC_64BIT_ADDR(hcc_params)) {
 601                 ehci_writel(ehci, 0, &ehci->regs->segment);
 602 #if 0
 603 // this is deeply broken on almost all architectures
 604                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
 605                         ehci_info(ehci, "enabled 64bit DMA\n");
 606 #endif
 607         }
 608
 609
 610         // Philips, Intel, and maybe others need CMD_RUN before the
 611         // root hub will detect new devices (why?); NEC doesn't
 612         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
 613         ehci->command |= CMD_RUN;
 614         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 615         dbg_cmd (ehci, "init", ehci->command);
 616
 617         /*
 618          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
 619          * are explicitly handed to companion controller(s), so no TT is
 620          * involved with the root hub.  (Except where one is integrated,
 621          * and there's no companion controller unless maybe for USB OTG.)
 622          *
 623          * Turning on the CF flag will transfer ownership of all ports
 624          * from the companions to the EHCI controller.  If any of the
 625          * companions are in the middle of a port reset at the time, it
 626          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
 627          * guarantees that no resets are in progress.  After we set CF,
 628          * a short delay lets the hardware catch up; new resets shouldn't
 629          * be started before the port switching actions could complete.
 630          */
 631         down_write(&ehci_cf_port_reset_rwsem);
 632         ehci->rh_state = EHCI_RH_RUNNING;
 633         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 634
 635         /* Wait until HC become operational */
 636         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 637         msleep(5);
 638
 639         /* For Aspeed, STS_HALT also depends on ASS/PSS status.
 640          * Check CMD_RUN instead.
 641          */
 642         if (ehci->is_aspeed)
 643                 rc = ehci_handshake(ehci, &ehci->regs->command, CMD_RUN,
 644                                     1, 100 * 1000);
 645         else
 646                 rc = ehci_handshake(ehci, &ehci->regs->status, STS_HALT,
 647                                     0, 100 * 1000);
 648
 649         up_write(&ehci_cf_port_reset_rwsem);
 650
 651         if (rc) {
 652                 ehci_err(ehci, "USB %x.%x, controller refused to start: %d\n",
 653                          ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f), rc);
 654                 return rc;
 655         }
 656
 657         ehci->last_periodic_enable = ktime_get_real();
 658
 659         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 660         ehci_info (ehci,
 661                 "USB %x.%x started, EHCI %x.%02x%s\n",
 662                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
 663                 temp >> 8, temp & 0xff,
 664                 (ignore_oc || ehci->spurious_oc) ? ", overcurrent ignored" : "");
 665
 666         ehci_writel(ehci, INTR_MASK,
 667                     &ehci->regs->intr_enable); /* Turn On Interrupts */
 668
 669         /* GRR this is run-once init(), being done every time the HC starts.
 670          * So long as they're part of class devices, we can't do it init()
 671          * since the class device isn't created that early.
 672          */
 673         create_debug_files(ehci);
 674         create_sysfs_files(ehci);
 675
 676         return 0;
 677 }
 678
 679 int ehci_setup(struct usb_hcd *hcd)
 680 {
 681         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 682         int retval;
 683
 684         ehci->regs = (void __iomem *)ehci->caps +
 685             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 686         dbg_hcs_params(ehci, "reset");
 687         dbg_hcc_params(ehci, "reset");
 688
 689         /* cache this readonly data; minimize chip reads */
 690         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 691
 692         ehci->sbrn = HCD_USB2;
 693
 694         /* data structure init */
 695         retval = ehci_init(hcd);
 696         if (retval)
 697                 return retval;
 698
 699         retval = ehci_halt(ehci);
 700         if (retval) {
 701                 ehci_mem_cleanup(ehci);
 702                 return retval;
 703         }
 704
 705         ehci_reset(ehci);
 706
 707         return 0;
 708 }
 709 EXPORT_SYMBOL_GPL(ehci_setup);
 710
 711 /*-------------------------------------------------------------------------*/
 712
 713 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 714 {
 715         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 716         u32                     status, current_status, masked_status, pcd_status = 0;
 717         u32                     cmd;
 718         int                     bh;
 719
 720         spin_lock(&ehci->lock);
 721
 722         status = 0;
 723         current_status = ehci_readl(ehci, &ehci->regs->status);
 724 restart:
 725
 726         /* e.g. cardbus physical eject */
 727         if (current_status == ~(u32) 0) {
 728                 ehci_dbg (ehci, "device removed\n");
 729                 goto dead;
 730         }
 731         status |= current_status;
 732
 733         /*
 734          * We don't use STS_FLR, but some controllers don't like it to
 735          * remain on, so mask it out along with the other status bits.
 736          */
 737         masked_status = current_status & (INTR_MASK | STS_FLR);
 738
 739         /* Shared IRQ? */
 740         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
 741                 spin_unlock(&ehci->lock);
 742                 return IRQ_NONE;
 743         }
 744
 745         /* clear (just) interrupts */
 746         ehci_writel(ehci, masked_status, &ehci->regs->status);
 747
 748         /* For edge interrupts, don't race with an interrupt bit being raised */
 749         current_status = ehci_readl(ehci, &ehci->regs->status);
 750         if (current_status & INTR_MASK)
 751                 goto restart;
 752
 753         cmd = ehci_readl(ehci, &ehci->regs->command);
 754         bh = 0;
 755
 756         /* normal [4.15.1.2] or error [4.15.1.1] completion */
 757         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
 758                 if (likely ((status & STS_ERR) == 0)) {
 759                         INCR(ehci->stats.normal);
 760                 } else {
 761                         /* Force to check port status */
 762                         if (ehci->has_ci_pec_bug)
 763                                 status |= STS_PCD;
 764                         INCR(ehci->stats.error);
 765                 }
 766                 bh = 1;
 767         }
 768
 769         /* complete the unlinking of some qh [4.15.2.3] */
 770         if (status & STS_IAA) {
 771
 772                 /* Turn off the IAA watchdog */
 773                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
 774
 775                 /*
 776                  * Mild optimization: Allow another IAAD to reset the
 777                  * hrtimer, if one occurs before the next expiration.
 778                  * In theory we could always cancel the hrtimer, but
 779                  * tests show that about half the time it will be reset
 780                  * for some other event anyway.
 781                  */
 782                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
 783                         ++ehci->next_hrtimer_event;
 784
 785                 /* guard against (alleged) silicon errata */
 786                 if (cmd & CMD_IAAD)
 787                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
 788                 if (ehci->iaa_in_progress)
 789                         INCR(ehci->stats.iaa);
 790                 end_iaa_cycle(ehci);
 791         }
 792
 793         /* remote wakeup [4.3.1] */
 794         if (status & STS_PCD) {
 795                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
 796                 u32             ppcd = ~0;
 797
 798                 /* kick root hub later */
 799                 pcd_status = status;
 800
 801                 /* resume root hub? */
 802                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
 803                         usb_hcd_resume_root_hub(hcd);
 804
 805                 /* get per-port change detect bits */
 806                 if (ehci->has_ppcd)
 807                         ppcd = status >> 16;
 808
 809                 while (i--) {
 810                         int pstatus;
 811
 812                         /* leverage per-port change bits feature */
 813                         if (!(ppcd & (1 << i)))
 814                                 continue;
 815                         pstatus = ehci_readl(ehci,
 816                                          &ehci->regs->port_status[i]);
 817
 818                         if (pstatus & PORT_OWNER)
 819                                 continue;
 820                         if (!(test_bit(i, &ehci->suspended_ports) &&
 821                                         ((pstatus & PORT_RESUME) ||
 822                                                 !(pstatus & PORT_SUSPEND)) &&
 823                                         (pstatus & PORT_PE) &&
 824                                         ehci->reset_done[i] == 0))
 825                                 continue;
 826
 827                         /* start USB_RESUME_TIMEOUT msec resume signaling from
 828                          * this port, and make hub_wq collect
 829                          * PORT_STAT_C_SUSPEND to stop that signaling.
 830                          */
 831                         ehci->reset_done[i] = jiffies +
 832                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
 833                         set_bit(i, &ehci->resuming_ports);
 834                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
 835                         usb_hcd_start_port_resume(&hcd->self, i);
 836                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
 837                 }
 838         }
 839
 840         /* PCI errors [4.15.2.4] */
 841         if (unlikely ((status & STS_FATAL) != 0)) {
 842                 ehci_err(ehci, "fatal error\n");
 843                 dbg_cmd(ehci, "fatal", cmd);
 844                 dbg_status(ehci, "fatal", status);
 845 dead:
 846                 usb_hc_died(hcd);
 847
 848                 /* Don't let the controller do anything more */
 849                 ehci->shutdown = true;
 850                 ehci->rh_state = EHCI_RH_STOPPING;
 851                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
 852                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 853                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 854                 ehci_handle_controller_death(ehci);
 855
 856                 /* Handle completions when the controller stops */
 857                 bh = 0;
 858         }
 859
 860         if (bh)
 861                 ehci_work (ehci);
 862         spin_unlock(&ehci->lock);
 863         if (pcd_status)
 864                 usb_hcd_poll_rh_status(hcd);
 865         return IRQ_HANDLED;
 866 }
 867
 868 /*-------------------------------------------------------------------------*/
 869
 870 /*
 871  * non-error returns are a promise to giveback() the urb later
 872  * we drop ownership so next owner (or urb unlink) can get it
 873  *
 874  * urb + dev is in hcd.self.controller.urb_list
 875  * we're queueing TDs onto software and hardware lists
 876  *
 877  * hcd-specific init for hcpriv hasn't been done yet
 878  *
 879  * NOTE:  control, bulk, and interrupt share the same code to append TDs
 880  * to a (possibly active) QH, and the same QH scanning code.
 881  */
 882 static int ehci_urb_enqueue (
 883         struct usb_hcd  *hcd,
 884         struct urb      *urb,
 885         gfp_t           mem_flags
 886 ) {
 887         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 888         struct list_head        qtd_list;
 889
 890         INIT_LIST_HEAD (&qtd_list);
 891
 892         switch (usb_pipetype (urb->pipe)) {
 893         case PIPE_CONTROL:
 894                 /* qh_completions() code doesn't handle all the fault cases
 895                  * in multi-TD control transfers.  Even 1KB is rare anyway.
 896                  */
 897                 if (urb->transfer_buffer_length > (16 * 1024))
 898                         return -EMSGSIZE;
 899                 fallthrough;
 900         /* case PIPE_BULK: */
 901         default:
 902                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 903                         return -ENOMEM;
 904                 return submit_async(ehci, urb, &qtd_list, mem_flags);
 905
 906         case PIPE_INTERRUPT:
 907                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
 908                         return -ENOMEM;
 909                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
 910
 911         case PIPE_ISOCHRONOUS:
 912                 if (urb->dev->speed == USB_SPEED_HIGH)
 913                         return itd_submit (ehci, urb, mem_flags);
 914                 else
 915                         return sitd_submit (ehci, urb, mem_flags);
 916         }
 917 }
 918
 919 /* remove from hardware lists
 920  * completions normally happen asynchronously
 921  */
 922
 923 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 924 {
 925         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 926         struct ehci_qh          *qh;
 927         unsigned long           flags;
 928         int                     rc;
 929
 930         spin_lock_irqsave (&ehci->lock, flags);
 931         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
 932         if (rc)
 933                 goto done;
 934
 935         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 936                 /*
 937                  * We don't expedite dequeue for isochronous URBs.
 938                  * Just wait until they complete normally or their
 939                  * time slot expires.
 940                  */
 941         } else {
 942                 qh = (struct ehci_qh *) urb->hcpriv;
 943                 qh->unlink_reason |= QH_UNLINK_REQUESTED;
 944                 switch (qh->qh_state) {
 945                 case QH_STATE_LINKED:
 946                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
 947                                 start_unlink_intr(ehci, qh);
 948                         else
 949                                 start_unlink_async(ehci, qh);
 950                         break;
 951                 case QH_STATE_COMPLETING:
 952                         qh->dequeue_during_giveback = 1;
 953                         break;
 954                 case QH_STATE_UNLINK:
 955                 case QH_STATE_UNLINK_WAIT:
 956                         /* already started */
 957                         break;
 958                 case QH_STATE_IDLE:
 959                         /* QH might be waiting for a Clear-TT-Buffer */
 960                         qh_completions(ehci, qh);
 961                         break;
 962                 }
 963         }
 964 done:
 965         spin_unlock_irqrestore (&ehci->lock, flags);
 966         return rc;
 967 }
 968
 969 /*-------------------------------------------------------------------------*/
 970
 971 // bulk qh holds the data toggle
 972
 973 static void
 974 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 975 {
 976         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 977         unsigned long           flags;
 978         struct ehci_qh          *qh;
 979
 980         /* ASSERT:  any requests/urbs are being unlinked */
 981         /* ASSERT:  nobody can be submitting urbs for this any more */
 982
 983 rescan:
 984         spin_lock_irqsave (&ehci->lock, flags);
 985         qh = ep->hcpriv;
 986         if (!qh)
 987                 goto done;
 988
 989         /* endpoints can be iso streams.  for now, we don't
 990          * accelerate iso completions ... so spin a while.
 991          */
 992         if (qh->hw == NULL) {
 993                 struct ehci_iso_stream  *stream = ep->hcpriv;
 994
 995                 if (!list_empty(&stream->td_list))
 996                         goto idle_timeout;
 997
 998                 /* BUG_ON(!list_empty(&stream->free_list)); */
 999                 reserve_release_iso_bandwidth(ehci, stream, -1);
1000                 kfree(stream);
1001                 goto done;
1002         }
1003
1004         qh->unlink_reason |= QH_UNLINK_REQUESTED;
1005         switch (qh->qh_state) {
1006         case QH_STATE_LINKED:
1007                 if (list_empty(&qh->qtd_list))
1008                         qh->unlink_reason |= QH_UNLINK_QUEUE_EMPTY;
1009                 else
1010                         WARN_ON(1);
1011                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
1012                         start_unlink_async(ehci, qh);
1013                 else
1014                         start_unlink_intr(ehci, qh);
1015                 fallthrough;
1016         case QH_STATE_COMPLETING:       /* already in unlinking */
1017         case QH_STATE_UNLINK:           /* wait for hw to finish? */
1018         case QH_STATE_UNLINK_WAIT:
1019 idle_timeout:
1020                 spin_unlock_irqrestore (&ehci->lock, flags);
1021                 schedule_timeout_uninterruptible(1);
1022                 goto rescan;
1023         case QH_STATE_IDLE:             /* fully unlinked */
1024                 if (qh->clearing_tt)
1025                         goto idle_timeout;
1026                 if (list_empty (&qh->qtd_list)) {
1027                         if (qh->ps.bw_uperiod)
1028                                 reserve_release_intr_bandwidth(ehci, qh, -1);
1029                         qh_destroy(ehci, qh);
1030                         break;
1031                 }
1032                 fallthrough;
1033         default:
1034                 /* caller was supposed to have unlinked any requests;
1035                  * that's not our job.  just leak this memory.
1036                  */
1037                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1038                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1039                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1040                 break;
1041         }
1042  done:
1043         ep->hcpriv = NULL;
1044         spin_unlock_irqrestore (&ehci->lock, flags);
1045 }
1046
1047 static void
1048 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1049 {
1050         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1051         struct ehci_qh          *qh;
1052         int                     eptype = usb_endpoint_type(&ep->desc);
1053         int                     epnum = usb_endpoint_num(&ep->desc);
1054         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1055         unsigned long           flags;
1056
1057         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1058                 return;
1059
1060         spin_lock_irqsave(&ehci->lock, flags);
1061         qh = ep->hcpriv;
1062
1063         /* For Bulk and Interrupt endpoints we maintain the toggle state
1064          * in the hardware; the toggle bits in udev aren't used at all.
1065          * When an endpoint is reset by usb_clear_halt() we must reset
1066          * the toggle bit in the QH.
1067          */
1068         if (qh) {
1069                 if (!list_empty(&qh->qtd_list)) {
1070                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1071                 } else {
1072                         /* The toggle value in the QH can't be updated
1073                          * while the QH is active.  Unlink it now;
1074                          * re-linking will call qh_refresh().
1075                          */
1076                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1077                         qh->unlink_reason |= QH_UNLINK_REQUESTED;
1078                         if (eptype == USB_ENDPOINT_XFER_BULK)
1079                                 start_unlink_async(ehci, qh);
1080                         else
1081                                 start_unlink_intr(ehci, qh);
1082                 }
1083         }
1084         spin_unlock_irqrestore(&ehci->lock, flags);
1085 }
1086
1087 static int ehci_get_frame (struct usb_hcd *hcd)
1088 {
1089         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1090         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1091 }
1092
1093 /*-------------------------------------------------------------------------*/
1094
1095 /* Device addition and removal */
1096
1097 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1098 {
1099         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1100
1101         spin_lock_irq(&ehci->lock);
1102         drop_tt(udev);
1103         spin_unlock_irq(&ehci->lock);
1104 }
1105
1106 /*-------------------------------------------------------------------------*/
1107
1108 #ifdef  CONFIG_PM
1109
1110 /* Clear wakeup signal locked in zhaoxin platform when device plug in. */
1111 static void ehci_zx_wakeup_clear(struct ehci_hcd *ehci)
1112 {
1113         u32 __iomem     *reg = &ehci->regs->port_status[4];
1114         u32             t1 = ehci_readl(ehci, reg);
1115
1116         t1 &= (u32)~0xf0000;
1117         t1 |= PORT_TEST_FORCE;
1118         ehci_writel(ehci, t1, reg);
1119         t1 = ehci_readl(ehci, reg);
1120         msleep(1);
1121         t1 &= (u32)~0xf0000;
1122         ehci_writel(ehci, t1, reg);
1123         ehci_readl(ehci, reg);
1124         msleep(1);
1125         t1 = ehci_readl(ehci, reg);
1126         ehci_writel(ehci, t1 | PORT_CSC, reg);
1127         ehci_readl(ehci, reg);
1128 }
1129
1130 /* suspend/resume, section 4.3 */
1131
1132 /* These routines handle the generic parts of controller suspend/resume */
1133
1134 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1135 {
1136         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1137
1138         if (time_before(jiffies, ehci->next_statechange))
1139                 msleep(10);
1140
1141         /*
1142          * Root hub was already suspended.  Disable IRQ emission and
1143          * mark HW unaccessible.  The PM and USB cores make sure that
1144          * the root hub is either suspended or stopped.
1145          */
1146         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1147
1148         spin_lock_irq(&ehci->lock);
1149         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1150         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1151
1152         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1153         spin_unlock_irq(&ehci->lock);
1154
1155         synchronize_irq(hcd->irq);
1156
1157         /* Check for race with a wakeup request */
1158         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1159                 ehci_resume(hcd, false);
1160                 return -EBUSY;
1161         }
1162
1163         return 0;
1164 }
1165 EXPORT_SYMBOL_GPL(ehci_suspend);
1166
1167 /* Returns 0 if power was preserved, 1 if power was lost */
1168 int ehci_resume(struct usb_hcd *hcd, bool force_reset)
1169 {
1170         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1171
1172         if (time_before(jiffies, ehci->next_statechange))
1173                 msleep(100);
1174
1175         /* Mark hardware accessible again as we are back to full power by now */
1176         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1177
1178         if (ehci->shutdown)
1179                 return 0;               /* Controller is dead */
1180
1181         if (ehci->zx_wakeup_clear_needed)
1182                 ehci_zx_wakeup_clear(ehci);
1183
1184         /*
1185          * If CF is still set and reset isn't forced
1186          * then we maintained suspend power.
1187          * Just undo the effect of ehci_suspend().
1188          */
1189         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1190                         !force_reset) {
1191                 int     mask = INTR_MASK;
1192
1193                 ehci_prepare_ports_for_controller_resume(ehci);
1194
1195                 spin_lock_irq(&ehci->lock);
1196                 if (ehci->shutdown)
1197                         goto skip;
1198
1199                 if (!hcd->self.root_hub->do_remote_wakeup)
1200                         mask &= ~STS_PCD;
1201                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1202                 ehci_readl(ehci, &ehci->regs->intr_enable);
1203  skip:
1204                 spin_unlock_irq(&ehci->lock);
1205                 return 0;
1206         }
1207
1208         /*
1209          * Else reset, to cope with power loss or resume from hibernation
1210          * having let the firmware kick in during reboot.
1211          */
1212         usb_root_hub_lost_power(hcd->self.root_hub);
1213         (void) ehci_halt(ehci);
1214         (void) ehci_reset(ehci);
1215
1216         spin_lock_irq(&ehci->lock);
1217         if (ehci->shutdown)
1218                 goto skip;
1219
1220         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1221         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1222         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1223
1224         ehci->rh_state = EHCI_RH_SUSPENDED;
1225         spin_unlock_irq(&ehci->lock);
1226
1227         return 1;
1228 }
1229 EXPORT_SYMBOL_GPL(ehci_resume);
1230
1231 #endif
1232
1233 /*-------------------------------------------------------------------------*/
1234
1235 /*
1236  * Generic structure: This gets copied for platform drivers so that
1237  * individual entries can be overridden as needed.
1238  */
1239
1240 static const struct hc_driver ehci_hc_driver = {
1241         .description =          hcd_name,
1242         .product_desc =         "EHCI Host Controller",
1243         .hcd_priv_size =        sizeof(struct ehci_hcd),
1244
1245         /*
1246          * generic hardware linkage
1247          */
1248         .irq =                  ehci_irq,
1249         .flags =                HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
1250
1251         /*
1252          * basic lifecycle operations
1253          */
1254         .reset =                ehci_setup,
1255         .start =                ehci_run,
1256         .stop =                 ehci_stop,
1257         .shutdown =             ehci_shutdown,
1258
1259         /*
1260          * managing i/o requests and associated device resources
1261          */
1262         .urb_enqueue =          ehci_urb_enqueue,
1263         .urb_dequeue =          ehci_urb_dequeue,
1264         .endpoint_disable =     ehci_endpoint_disable,
1265         .endpoint_reset =       ehci_endpoint_reset,
1266         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1267
1268         /*
1269          * scheduling support
1270          */
1271         .get_frame_number =     ehci_get_frame,
1272
1273         /*
1274          * root hub support
1275          */
1276         .hub_status_data =      ehci_hub_status_data,
1277         .hub_control =          ehci_hub_control,
1278         .bus_suspend =          ehci_bus_suspend,
1279         .bus_resume =           ehci_bus_resume,
1280         .relinquish_port =      ehci_relinquish_port,
1281         .port_handed_over =     ehci_port_handed_over,
1282         .get_resuming_ports =   ehci_get_resuming_ports,
1283
1284         /*
1285          * device support
1286          */
1287         .free_dev =             ehci_remove_device,
1288 #ifdef CONFIG_USB_HCD_TEST_MODE
1289         /* EH SINGLE_STEP_SET_FEATURE test support */
1290         .submit_single_step_set_feature = ehci_submit_single_step_set_feature,
1291 #endif
1292 };
1293
1294 void ehci_init_driver(struct hc_driver *drv,
1295                 const struct ehci_driver_overrides *over)
1296 {
1297         /* Copy the generic table to drv and then apply the overrides */
1298         *drv = ehci_hc_driver;
1299
1300         if (over) {
1301                 drv->hcd_priv_size += over->extra_priv_size;
1302                 if (over->reset)
1303                         drv->reset = over->reset;
1304                 if (over->port_power)
1305                         drv->port_power = over->port_power;
1306         }
1307 }
1308 EXPORT_SYMBOL_GPL(ehci_init_driver);
1309
1310 /*-------------------------------------------------------------------------*/
1311
1312 MODULE_DESCRIPTION(DRIVER_DESC);
1313 MODULE_AUTHOR (DRIVER_AUTHOR);
1314 MODULE_LICENSE ("GPL");
1315
1316 #ifdef CONFIG_USB_EHCI_SH
1317 #include "ehci-sh.c"
1318 #endif
1319
1320 #ifdef CONFIG_PPC_PS3
1321 #include "ehci-ps3.c"
1322 #endif
1323
1324 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1325 #include "ehci-ppc-of.c"
1326 #endif
1327
1328 #ifdef CONFIG_XPS_USB_HCD_XILINX
1329 #include "ehci-xilinx-of.c"
1330 #endif
1331
1332 #ifdef CONFIG_SPARC_LEON
1333 #include "ehci-grlib.c"
1334 #endif
1335
1336 static struct platform_driver * const platform_drivers[] = {
1337 #ifdef CONFIG_USB_EHCI_SH
1338         &ehci_hcd_sh_driver,
1339 #endif
1340 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1341         &ehci_hcd_ppc_of_driver,
1342 #endif
1343 #ifdef CONFIG_XPS_USB_HCD_XILINX
1344         &ehci_hcd_xilinx_of_driver,
1345 #endif
1346 #ifdef CONFIG_SPARC_LEON
1347         &ehci_grlib_driver,
1348 #endif
1349 };
1350
1351 static int __init ehci_hcd_init(void)
1352 {
1353         int retval = 0;
1354
1355         if (usb_disabled())
1356                 return -ENODEV;
1357
1358         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1359         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1360                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1361                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1362                                 " before uhci_hcd and ohci_hcd, not after\n");
1363
1364         pr_debug("%s: block sizes: qh %zd qtd %zd itd %zd sitd %zd\n",
1365                  hcd_name,
1366                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1367                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1368
1369 #ifdef CONFIG_DYNAMIC_DEBUG
1370         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1371 #endif
1372
1373         retval = platform_register_drivers(platform_drivers, ARRAY_SIZE(platform_drivers));
1374         if (retval < 0)
1375                 goto clean0;
1376
1377 #ifdef CONFIG_PPC_PS3
1378         retval = ps3_ehci_driver_register(&ps3_ehci_driver);
1379         if (retval < 0)
1380                 goto clean1;
1381 #endif
1382
1383         return 0;
1384
1385 #ifdef CONFIG_PPC_PS3
1386 clean1:
1387 #endif
1388         platform_unregister_drivers(platform_drivers, ARRAY_SIZE(platform_drivers));
1389 clean0:
1390 #ifdef CONFIG_DYNAMIC_DEBUG
1391         debugfs_remove(ehci_debug_root);
1392         ehci_debug_root = NULL;
1393 #endif
1394         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1395         return retval;
1396 }
1397 module_init(ehci_hcd_init);
1398
1399 static void __exit ehci_hcd_cleanup(void)
1400 {
1401 #ifdef CONFIG_PPC_PS3
1402         ps3_ehci_driver_unregister(&ps3_ehci_driver);
1403 #endif
1404         platform_unregister_drivers(platform_drivers, ARRAY_SIZE(platform_drivers));
1405 #ifdef CONFIG_DYNAMIC_DEBUG
1406         debugfs_remove(ehci_debug_root);
1407 #endif
1408         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1409 }
1410 module_exit(ehci_hcd_cleanup);