drivers/usb/host/ehci-hcd.c

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

DEFINITIONS
