git.oblomov.eu Git - linux-2.6/blob - drivers/usb/host/uhci-hcd.c

   1 /*
   2  * Universal Host Controller Interface driver for USB.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * (C) Copyright 1999 Linus Torvalds
   7  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
   8  * (C) Copyright 1999 Randy Dunlap
   9  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
  10  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
  11  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
  12  * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
  13  * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
  14  *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
  15  * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
  16  * (C) Copyright 2004-2006 Alan Stern, stern@rowland.harvard.edu
  17  *
  18  * Intel documents this fairly well, and as far as I know there
  19  * are no royalties or anything like that, but even so there are
  20  * people who decided that they want to do the same thing in a
  21  * completely different way.
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/pci.h>
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <linux/delay.h>
  30 #include <linux/ioport.h>
  31 #include <linux/slab.h>
  32 #include <linux/errno.h>
  33 #include <linux/unistd.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/debugfs.h>
  37 #include <linux/pm.h>
  38 #include <linux/dmapool.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/usb.h>
  41 #include <linux/bitops.h>
  42 #include <linux/dmi.h>
  43
  44 #include <asm/uaccess.h>
  45 #include <asm/io.h>
  46 #include <asm/irq.h>
  47 #include <asm/system.h>
  48
  49 #include "../core/hcd.h"
  50 #include "uhci-hcd.h"
  51 #include "pci-quirks.h"
  52
  53 /*
  54  * Version Information
  55  */
  56 #define DRIVER_VERSION "v3.0"
  57 #define DRIVER_AUTHOR "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, \
  58 Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, Roman Weissgaerber, \
  59 Alan Stern"
  60 #define DRIVER_DESC "USB Universal Host Controller Interface driver"
  61
  62 /* for flakey hardware, ignore overcurrent indicators */
  63 static int ignore_oc;
  64 module_param(ignore_oc, bool, S_IRUGO);
  65 MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications");
  66
  67 /*
  68  * debug = 0, no debugging messages
  69  * debug = 1, dump failed URBs except for stalls
  70  * debug = 2, dump all failed URBs (including stalls)
  71  *            show all queues in /debug/uhci/[pci_addr]
  72  * debug = 3, show all TDs in URBs when dumping
  73  */
  74 #ifdef DEBUG
  75 #define DEBUG_CONFIGURED        1
  76 static int debug = 1;
  77 module_param(debug, int, S_IRUGO | S_IWUSR);
  78 MODULE_PARM_DESC(debug, "Debug level");
  79
  80 #else
  81 #define DEBUG_CONFIGURED        0
  82 #define debug                   0
  83 #endif
  84
  85 static char *errbuf;
  86 #define ERRBUF_LEN    (32 * 1024)
  87
  88 static struct kmem_cache *uhci_up_cachep;       /* urb_priv */
  89
  90 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state);
  91 static void wakeup_rh(struct uhci_hcd *uhci);
  92 static void uhci_get_current_frame_number(struct uhci_hcd *uhci);
  93
  94 /*
  95  * Calculate the link pointer DMA value for the first Skeleton QH in a frame.
  96  */
  97 static __le32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame)
  98 {
  99         int skelnum;
 100
 101         /*
 102          * The interrupt queues will be interleaved as evenly as possible.
 103          * There's not much to be done about period-1 interrupts; they have
 104          * to occur in every frame.  But we can schedule period-2 interrupts
 105          * in odd-numbered frames, period-4 interrupts in frames congruent
 106          * to 2 (mod 4), and so on.  This way each frame only has two
 107          * interrupt QHs, which will help spread out bandwidth utilization.
 108          *
 109          * ffs (Find First bit Set) does exactly what we need:
 110          * 1,3,5,...  => ffs = 0 => use skel_int2_qh = skelqh[8],
 111          * 2,6,10,... => ffs = 1 => use skel_int4_qh = skelqh[7], etc.
 112          * ffs >= 7 => not on any high-period queue, so use
 113          *      skel_int1_qh = skelqh[9].
 114          * Add in UHCI_NUMFRAMES to insure at least one bit is set.
 115          */
 116         skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES);
 117         if (skelnum <= 1)
 118                 skelnum = 9;
 119         return UHCI_PTR_QH | cpu_to_le32(uhci->skelqh[skelnum]->dma_handle);
 120 }
 121
 122 #include "uhci-debug.c"
 123 #include "uhci-q.c"
 124 #include "uhci-hub.c"
 125
 126 /*
 127  * Finish up a host controller reset and update the recorded state.
 128  */
 129 static void finish_reset(struct uhci_hcd *uhci)
 130 {
 131         int port;
 132
 133         /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
 134          * bits in the port status and control registers.
 135          * We have to clear them by hand.
 136          */
 137         for (port = 0; port < uhci->rh_numports; ++port)
 138                 outw(0, uhci->io_addr + USBPORTSC1 + (port * 2));
 139
 140         uhci->port_c_suspend = uhci->resuming_ports = 0;
 141         uhci->rh_state = UHCI_RH_RESET;
 142         uhci->is_stopped = UHCI_IS_STOPPED;
 143         uhci_to_hcd(uhci)->state = HC_STATE_HALT;
 144         uhci_to_hcd(uhci)->poll_rh = 0;
 145
 146         uhci->dead = 0;         /* Full reset resurrects the controller */
 147 }
 148
 149 /*
 150  * Last rites for a defunct/nonfunctional controller
 151  * or one we don't want to use any more.
 152  */
 153 static void uhci_hc_died(struct uhci_hcd *uhci)
 154 {
 155         uhci_get_current_frame_number(uhci);
 156         uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
 157         finish_reset(uhci);
 158         uhci->dead = 1;
 159
 160         /* The current frame may already be partway finished */
 161         ++uhci->frame_number;
 162 }
 163
 164 /*
 165  * Initialize a controller that was newly discovered or has lost power
 166  * or otherwise been reset while it was suspended.  In none of these cases
 167  * can we be sure of its previous state.
 168  */
 169 static void check_and_reset_hc(struct uhci_hcd *uhci)
 170 {
 171         if (uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr))
 172                 finish_reset(uhci);
 173 }
 174
 175 /*
 176  * Store the basic register settings needed by the controller.
 177  */
 178 static void configure_hc(struct uhci_hcd *uhci)
 179 {
 180         /* Set the frame length to the default: 1 ms exactly */
 181         outb(USBSOF_DEFAULT, uhci->io_addr + USBSOF);
 182
 183         /* Store the frame list base address */
 184         outl(uhci->frame_dma_handle, uhci->io_addr + USBFLBASEADD);
 185
 186         /* Set the current frame number */
 187         outw(uhci->frame_number & UHCI_MAX_SOF_NUMBER,
 188                         uhci->io_addr + USBFRNUM);
 189
 190         /* Mark controller as not halted before we enable interrupts */
 191         uhci_to_hcd(uhci)->state = HC_STATE_SUSPENDED;
 192         mb();
 193
 194         /* Enable PIRQ */
 195         pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP,
 196                         USBLEGSUP_DEFAULT);
 197 }
 198
 199
 200 static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
 201 {
 202         int port;
 203
 204         /* If we have to ignore overcurrent events then almost by definition
 205          * we can't depend on resume-detect interrupts. */
 206         if (ignore_oc)
 207                 return 1;
 208
 209         switch (to_pci_dev(uhci_dev(uhci))->vendor) {
 210             default:
 211                 break;
 212
 213             case PCI_VENDOR_ID_GENESYS:
 214                 /* Genesys Logic's GL880S controllers don't generate
 215                  * resume-detect interrupts.
 216                  */
 217                 return 1;
 218
 219             case PCI_VENDOR_ID_INTEL:
 220                 /* Some of Intel's USB controllers have a bug that causes
 221                  * resume-detect interrupts if any port has an over-current
 222                  * condition.  To make matters worse, some motherboards
 223                  * hardwire unused USB ports' over-current inputs active!
 224                  * To prevent problems, we will not enable resume-detect
 225                  * interrupts if any ports are OC.
 226                  */
 227                 for (port = 0; port < uhci->rh_numports; ++port) {
 228                         if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
 229                                         USBPORTSC_OC)
 230                                 return 1;
 231                 }
 232                 break;
 233         }
 234         return 0;
 235 }
 236
 237 static int remote_wakeup_is_broken(struct uhci_hcd *uhci)
 238 {
 239         int port;
 240         char *sys_info;
 241         static char bad_Asus_board[] = "A7V8X";
 242
 243         /* One of Asus's motherboards has a bug which causes it to
 244          * wake up immediately from suspend-to-RAM if any of the ports
 245          * are connected.  In such cases we will not set EGSM.
 246          */
 247         sys_info = dmi_get_system_info(DMI_BOARD_NAME);
 248         if (sys_info && !strcmp(sys_info, bad_Asus_board)) {
 249                 for (port = 0; port < uhci->rh_numports; ++port) {
 250                         if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
 251                                         USBPORTSC_CCS)
 252                                 return 1;
 253                 }
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
 260 __releases(uhci->lock)
 261 __acquires(uhci->lock)
 262 {
 263         int auto_stop;
 264         int int_enable, egsm_enable;
 265
 266         auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
 267         dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
 268                         "%s%s\n", __FUNCTION__,
 269                         (auto_stop ? " (auto-stop)" : ""));
 270
 271         /* If we get a suspend request when we're already auto-stopped
 272          * then there's nothing to do.
 273          */
 274         if (uhci->rh_state == UHCI_RH_AUTO_STOPPED) {
 275                 uhci->rh_state = new_state;
 276                 return;
 277         }
 278
 279         /* Enable resume-detect interrupts if they work.
 280          * Then enter Global Suspend mode if _it_ works, still configured.
 281          */
 282         egsm_enable = USBCMD_EGSM;
 283         uhci->working_RD = 1;
 284         int_enable = USBINTR_RESUME;
 285         if (remote_wakeup_is_broken(uhci))
 286                 egsm_enable = 0;
 287         if (resume_detect_interrupts_are_broken(uhci) || !egsm_enable ||
 288                         !device_may_wakeup(
 289                                 &uhci_to_hcd(uhci)->self.root_hub->dev))
 290                 uhci->working_RD = int_enable = 0;
 291
 292         outw(int_enable, uhci->io_addr + USBINTR);
 293         outw(egsm_enable | USBCMD_CF, uhci->io_addr + USBCMD);
 294         mb();
 295         udelay(5);
 296
 297         /* If we're auto-stopping then no devices have been attached
 298          * for a while, so there shouldn't be any active URBs and the
 299          * controller should stop after a few microseconds.  Otherwise
 300          * we will give the controller one frame to stop.
 301          */
 302         if (!auto_stop && !(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) {
 303                 uhci->rh_state = UHCI_RH_SUSPENDING;
 304                 spin_unlock_irq(&uhci->lock);
 305                 msleep(1);
 306                 spin_lock_irq(&uhci->lock);
 307                 if (uhci->dead)
 308                         return;
 309         }
 310         if (!(inw(uhci->io_addr + USBSTS) & USBSTS_HCH))
 311                 dev_warn(&uhci_to_hcd(uhci)->self.root_hub->dev,
 312                         "Controller not stopped yet!\n");
 313
 314         uhci_get_current_frame_number(uhci);
 315
 316         uhci->rh_state = new_state;
 317         uhci->is_stopped = UHCI_IS_STOPPED;
 318         uhci_to_hcd(uhci)->poll_rh = !int_enable;
 319
 320         uhci_scan_schedule(uhci);
 321         uhci_fsbr_off(uhci);
 322 }
 323
 324 static void start_rh(struct uhci_hcd *uhci)
 325 {
 326         uhci_to_hcd(uhci)->state = HC_STATE_RUNNING;
 327         uhci->is_stopped = 0;
 328
 329         /* Mark it configured and running with a 64-byte max packet.
 330          * All interrupts are enabled, even though RESUME won't do anything.
 331          */
 332         outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, uhci->io_addr + USBCMD);
 333         outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP,
 334                         uhci->io_addr + USBINTR);
 335         mb();
 336         uhci->rh_state = UHCI_RH_RUNNING;
 337         uhci_to_hcd(uhci)->poll_rh = 1;
 338 }
 339
 340 static void wakeup_rh(struct uhci_hcd *uhci)
 341 __releases(uhci->lock)
 342 __acquires(uhci->lock)
 343 {
 344         dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
 345                         "%s%s\n", __FUNCTION__,
 346                         uhci->rh_state == UHCI_RH_AUTO_STOPPED ?
 347                                 " (auto-start)" : "");
 348
 349         /* If we are auto-stopped then no devices are attached so there's
 350          * no need for wakeup signals.  Otherwise we send Global Resume
 351          * for 20 ms.
 352          */
 353         if (uhci->rh_state == UHCI_RH_SUSPENDED) {
 354                 uhci->rh_state = UHCI_RH_RESUMING;
 355                 outw(USBCMD_FGR | USBCMD_EGSM | USBCMD_CF,
 356                                 uhci->io_addr + USBCMD);
 357                 spin_unlock_irq(&uhci->lock);
 358                 msleep(20);
 359                 spin_lock_irq(&uhci->lock);
 360                 if (uhci->dead)
 361                         return;
 362
 363                 /* End Global Resume and wait for EOP to be sent */
 364                 outw(USBCMD_CF, uhci->io_addr + USBCMD);
 365                 mb();
 366                 udelay(4);
 367                 if (inw(uhci->io_addr + USBCMD) & USBCMD_FGR)
 368                         dev_warn(uhci_dev(uhci), "FGR not stopped yet!\n");
 369         }
 370
 371         start_rh(uhci);
 372
 373         /* Restart root hub polling */
 374         mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
 375 }
 376
 377 static irqreturn_t uhci_irq(struct usb_hcd *hcd)
 378 {
 379         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 380         unsigned short status;
 381         unsigned long flags;
 382
 383         /*
 384          * Read the interrupt status, and write it back to clear the
 385          * interrupt cause.  Contrary to the UHCI specification, the
 386          * "HC Halted" status bit is persistent: it is RO, not R/WC.
 387          */
 388         status = inw(uhci->io_addr + USBSTS);
 389         if (!(status & ~USBSTS_HCH))    /* shared interrupt, not mine */
 390                 return IRQ_NONE;
 391         outw(status, uhci->io_addr + USBSTS);           /* Clear it */
 392
 393         if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
 394                 if (status & USBSTS_HSE)
 395                         dev_err(uhci_dev(uhci), "host system error, "
 396                                         "PCI problems?\n");
 397                 if (status & USBSTS_HCPE)
 398                         dev_err(uhci_dev(uhci), "host controller process "
 399                                         "error, something bad happened!\n");
 400                 if (status & USBSTS_HCH) {
 401                         spin_lock_irqsave(&uhci->lock, flags);
 402                         if (uhci->rh_state >= UHCI_RH_RUNNING) {
 403                                 dev_err(uhci_dev(uhci),
 404                                         "host controller halted, "
 405                                         "very bad!\n");
 406                                 if (debug > 1 && errbuf) {
 407                                         /* Print the schedule for debugging */
 408                                         uhci_sprint_schedule(uhci,
 409                                                         errbuf, ERRBUF_LEN);
 410                                         lprintk(errbuf);
 411                                 }
 412                                 uhci_hc_died(uhci);
 413
 414                                 /* Force a callback in case there are
 415                                  * pending unlinks */
 416                                 mod_timer(&hcd->rh_timer, jiffies);
 417                         }
 418                         spin_unlock_irqrestore(&uhci->lock, flags);
 419                 }
 420         }
 421
 422         if (status & USBSTS_RD)
 423                 usb_hcd_poll_rh_status(hcd);
 424         else {
 425                 spin_lock_irqsave(&uhci->lock, flags);
 426                 uhci_scan_schedule(uhci);
 427                 spin_unlock_irqrestore(&uhci->lock, flags);
 428         }
 429
 430         return IRQ_HANDLED;
 431 }
 432
 433 /*
 434  * Store the current frame number in uhci->frame_number if the controller
 435  * is runnning.  Expand from 11 bits (of which we use only 10) to a
 436  * full-sized integer.
 437  *
 438  * Like many other parts of the driver, this code relies on being polled
 439  * more than once per second as long as the controller is running.
 440  */
 441 static void uhci_get_current_frame_number(struct uhci_hcd *uhci)
 442 {
 443         if (!uhci->is_stopped) {
 444                 unsigned delta;
 445
 446                 delta = (inw(uhci->io_addr + USBFRNUM) - uhci->frame_number) &
 447                                 (UHCI_NUMFRAMES - 1);
 448                 uhci->frame_number += delta;
 449         }
 450 }
 451
 452 /*
 453  * De-allocate all resources
 454  */
 455 static void release_uhci(struct uhci_hcd *uhci)
 456 {
 457         int i;
 458
 459         if (DEBUG_CONFIGURED) {
 460                 spin_lock_irq(&uhci->lock);
 461                 uhci->is_initialized = 0;
 462                 spin_unlock_irq(&uhci->lock);
 463
 464                 debugfs_remove(uhci->dentry);
 465         }
 466
 467         for (i = 0; i < UHCI_NUM_SKELQH; i++)
 468                 uhci_free_qh(uhci, uhci->skelqh[i]);
 469
 470         uhci_free_td(uhci, uhci->term_td);
 471
 472         dma_pool_destroy(uhci->qh_pool);
 473
 474         dma_pool_destroy(uhci->td_pool);
 475
 476         kfree(uhci->frame_cpu);
 477
 478         dma_free_coherent(uhci_dev(uhci),
 479                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
 480                         uhci->frame, uhci->frame_dma_handle);
 481 }
 482
 483 static int uhci_init(struct usb_hcd *hcd)
 484 {
 485         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 486         unsigned io_size = (unsigned) hcd->rsrc_len;
 487         int port;
 488
 489         uhci->io_addr = (unsigned long) hcd->rsrc_start;
 490
 491         /* The UHCI spec says devices must have 2 ports, and goes on to say
 492          * they may have more but gives no way to determine how many there
 493          * are.  However according to the UHCI spec, Bit 7 of the port
 494          * status and control register is always set to 1.  So we try to
 495          * use this to our advantage.  Another common failure mode when
 496          * a nonexistent register is addressed is to return all ones, so
 497          * we test for that also.
 498          */
 499         for (port = 0; port < (io_size - USBPORTSC1) / 2; port++) {
 500                 unsigned int portstatus;
 501
 502                 portstatus = inw(uhci->io_addr + USBPORTSC1 + (port * 2));
 503                 if (!(portstatus & 0x0080) || portstatus == 0xffff)
 504                         break;
 505         }
 506         if (debug)
 507                 dev_info(uhci_dev(uhci), "detected %d ports\n", port);
 508
 509         /* Anything greater than 7 is weird so we'll ignore it. */
 510         if (port > UHCI_RH_MAXCHILD) {
 511                 dev_info(uhci_dev(uhci), "port count misdetected? "
 512                                 "forcing to 2 ports\n");
 513                 port = 2;
 514         }
 515         uhci->rh_numports = port;
 516
 517         /* Kick BIOS off this hardware and reset if the controller
 518          * isn't already safely quiescent.
 519          */
 520         check_and_reset_hc(uhci);
 521         return 0;
 522 }
 523
 524 /* Make sure the controller is quiescent and that we're not using it
 525  * any more.  This is mainly for the benefit of programs which, like kexec,
 526  * expect the hardware to be idle: not doing DMA or generating IRQs.
 527  *
 528  * This routine may be called in a damaged or failing kernel.  Hence we
 529  * do not acquire the spinlock before shutting down the controller.
 530  */
 531 static void uhci_shutdown(struct pci_dev *pdev)
 532 {
 533         struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev);
 534
 535         uhci_hc_died(hcd_to_uhci(hcd));
 536 }
 537
 538 /*
 539  * Allocate a frame list, and then setup the skeleton
 540  *
 541  * The hardware doesn't really know any difference
 542  * in the queues, but the order does matter for the
 543  * protocols higher up. The order is:
 544  *
 545  *  - any isochronous events handled before any
 546  *    of the queues. We don't do that here, because
 547  *    we'll create the actual TD entries on demand.
 548  *  - The first queue is the interrupt queue.
 549  *  - The second queue is the control queue, split into low- and full-speed
 550  *  - The third queue is bulk queue.
 551  *  - The fourth queue is the bandwidth reclamation queue, which loops back
 552  *    to the full-speed control queue.
 553  */
 554 static int uhci_start(struct usb_hcd *hcd)
 555 {
 556         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 557         int retval = -EBUSY;
 558         int i;
 559         struct dentry *dentry;
 560
 561         hcd->uses_new_polling = 1;
 562
 563         spin_lock_init(&uhci->lock);
 564         setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
 565                         (unsigned long) uhci);
 566         INIT_LIST_HEAD(&uhci->idle_qh_list);
 567         init_waitqueue_head(&uhci->waitqh);
 568
 569         if (DEBUG_CONFIGURED) {
 570                 dentry = debugfs_create_file(hcd->self.bus_name,
 571                                 S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,
 572                                 uhci, &uhci_debug_operations);
 573                 if (!dentry) {
 574                         dev_err(uhci_dev(uhci), "couldn't create uhci "
 575                                         "debugfs entry\n");
 576                         retval = -ENOMEM;
 577                         goto err_create_debug_entry;
 578                 }
 579                 uhci->dentry = dentry;
 580         }
 581
 582         uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
 583                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
 584                         &uhci->frame_dma_handle, 0);
 585         if (!uhci->frame) {
 586                 dev_err(uhci_dev(uhci), "unable to allocate "
 587                                 "consistent memory for frame list\n");
 588                 goto err_alloc_frame;
 589         }
 590         memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));
 591
 592         uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
 593                         GFP_KERNEL);
 594         if (!uhci->frame_cpu) {
 595                 dev_err(uhci_dev(uhci), "unable to allocate "
 596                                 "memory for frame pointers\n");
 597                 goto err_alloc_frame_cpu;
 598         }
 599
 600         uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci),
 601                         sizeof(struct uhci_td), 16, 0);
 602         if (!uhci->td_pool) {
 603                 dev_err(uhci_dev(uhci), "unable to create td dma_pool\n");
 604                 goto err_create_td_pool;
 605         }
 606
 607         uhci->qh_pool = dma_pool_create("uhci_qh", uhci_dev(uhci),
 608                         sizeof(struct uhci_qh), 16, 0);
 609         if (!uhci->qh_pool) {
 610                 dev_err(uhci_dev(uhci), "unable to create qh dma_pool\n");
 611                 goto err_create_qh_pool;
 612         }
 613
 614         uhci->term_td = uhci_alloc_td(uhci);
 615         if (!uhci->term_td) {
 616                 dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n");
 617                 goto err_alloc_term_td;
 618         }
 619
 620         for (i = 0; i < UHCI_NUM_SKELQH; i++) {
 621                 uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL);
 622                 if (!uhci->skelqh[i]) {
 623                         dev_err(uhci_dev(uhci), "unable to allocate QH\n");
 624                         goto err_alloc_skelqh;
 625                 }
 626         }
 627
 628         /*
 629          * 8 Interrupt queues; link all higher int queues to int1,
 630          * then link int1 to control and control to bulk
 631          */
 632         uhci->skel_int128_qh->link =
 633                         uhci->skel_int64_qh->link =
 634                         uhci->skel_int32_qh->link =
 635                         uhci->skel_int16_qh->link =
 636                         uhci->skel_int8_qh->link =
 637                         uhci->skel_int4_qh->link =
 638                         uhci->skel_int2_qh->link = UHCI_PTR_QH |
 639                         cpu_to_le32(uhci->skel_int1_qh->dma_handle);
 640
 641         uhci->skel_int1_qh->link = UHCI_PTR_QH |
 642                         cpu_to_le32(uhci->skel_ls_control_qh->dma_handle);
 643         uhci->skel_ls_control_qh->link = UHCI_PTR_QH |
 644                         cpu_to_le32(uhci->skel_fs_control_qh->dma_handle);
 645         uhci->skel_fs_control_qh->link = UHCI_PTR_QH |
 646                         cpu_to_le32(uhci->skel_bulk_qh->dma_handle);
 647         uhci->skel_bulk_qh->link = UHCI_PTR_QH |
 648                         cpu_to_le32(uhci->skel_term_qh->dma_handle);
 649
 650         /* This dummy TD is to work around a bug in Intel PIIX controllers */
 651         uhci_fill_td(uhci->term_td, 0, uhci_explen(0) |
 652                 (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
 653         uhci->term_td->link = cpu_to_le32(uhci->term_td->dma_handle);
 654
 655         uhci->skel_term_qh->link = UHCI_PTR_TERM;
 656         uhci->skel_term_qh->element = cpu_to_le32(uhci->term_td->dma_handle);
 657
 658         /*
 659          * Fill the frame list: make all entries point to the proper
 660          * interrupt queue.
 661          */
 662         for (i = 0; i < UHCI_NUMFRAMES; i++) {
 663
 664                 /* Only place we don't use the frame list routines */
 665                 uhci->frame[i] = uhci_frame_skel_link(uhci, i);
 666         }
 667
 668         /*
 669          * Some architectures require a full mb() to enforce completion of
 670          * the memory writes above before the I/O transfers in configure_hc().
 671          */
 672         mb();
 673
 674         configure_hc(uhci);
 675         uhci->is_initialized = 1;
 676         start_rh(uhci);
 677         return 0;
 678
 679 /*
 680  * error exits:
 681  */
 682 err_alloc_skelqh:
 683         for (i = 0; i < UHCI_NUM_SKELQH; i++) {
 684                 if (uhci->skelqh[i])
 685                         uhci_free_qh(uhci, uhci->skelqh[i]);
 686         }
 687
 688         uhci_free_td(uhci, uhci->term_td);
 689
 690 err_alloc_term_td:
 691         dma_pool_destroy(uhci->qh_pool);
 692
 693 err_create_qh_pool:
 694         dma_pool_destroy(uhci->td_pool);
 695
 696 err_create_td_pool:
 697         kfree(uhci->frame_cpu);
 698
 699 err_alloc_frame_cpu:
 700         dma_free_coherent(uhci_dev(uhci),
 701                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
 702                         uhci->frame, uhci->frame_dma_handle);
 703
 704 err_alloc_frame:
 705         debugfs_remove(uhci->dentry);
 706
 707 err_create_debug_entry:
 708         return retval;
 709 }
 710
 711 static void uhci_stop(struct usb_hcd *hcd)
 712 {
 713         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 714
 715         spin_lock_irq(&uhci->lock);
 716         if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead)
 717                 uhci_hc_died(uhci);
 718         uhci_scan_schedule(uhci);
 719         spin_unlock_irq(&uhci->lock);
 720
 721         del_timer_sync(&uhci->fsbr_timer);
 722         release_uhci(uhci);
 723 }
 724
 725 #ifdef CONFIG_PM
 726 static int uhci_rh_suspend(struct usb_hcd *hcd)
 727 {
 728         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 729         int rc = 0;
 730
 731         spin_lock_irq(&uhci->lock);
 732         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
 733                 rc = -ESHUTDOWN;
 734         else if (!uhci->dead)
 735                 suspend_rh(uhci, UHCI_RH_SUSPENDED);
 736         spin_unlock_irq(&uhci->lock);
 737         return rc;
 738 }
 739
 740 static int uhci_rh_resume(struct usb_hcd *hcd)
 741 {
 742         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 743         int rc = 0;
 744
 745         spin_lock_irq(&uhci->lock);
 746         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 747                 dev_warn(&hcd->self.root_hub->dev, "HC isn't running!\n");
 748                 rc = -ESHUTDOWN;
 749         } else if (!uhci->dead)
 750                 wakeup_rh(uhci);
 751         spin_unlock_irq(&uhci->lock);
 752         return rc;
 753 }
 754
 755 static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message)
 756 {
 757         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 758         int rc = 0;
 759
 760         dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__);
 761
 762         spin_lock_irq(&uhci->lock);
 763         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
 764                 goto done_okay;         /* Already suspended or dead */
 765
 766         if (uhci->rh_state > UHCI_RH_SUSPENDED) {
 767                 dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n");
 768                 rc = -EBUSY;
 769                 goto done;
 770         };
 771
 772         /* All PCI host controllers are required to disable IRQ generation
 773          * at the source, so we must turn off PIRQ.
 774          */
 775         pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
 776         mb();
 777         hcd->poll_rh = 0;
 778
 779         /* FIXME: Enable non-PME# remote wakeup? */
 780
 781         /* make sure snapshot being resumed re-enumerates everything */
 782         if (message.event == PM_EVENT_PRETHAW)
 783                 uhci_hc_died(uhci);
 784
 785 done_okay:
 786         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 787 done:
 788         spin_unlock_irq(&uhci->lock);
 789         return rc;
 790 }
 791
 792 static int uhci_resume(struct usb_hcd *hcd)
 793 {
 794         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 795
 796         dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__);
 797
 798         /* Since we aren't in D3 any more, it's safe to set this flag
 799          * even if the controller was dead.
 800          */
 801         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 802         mb();
 803
 804         spin_lock_irq(&uhci->lock);
 805
 806         /* FIXME: Disable non-PME# remote wakeup? */
 807
 808         /* The firmware or a boot kernel may have changed the controller
 809          * settings during a system wakeup.  Check it and reconfigure
 810          * to avoid problems.
 811          */
 812         check_and_reset_hc(uhci);
 813
 814         /* If the controller was dead before, it's back alive now */
 815         configure_hc(uhci);
 816
 817         if (uhci->rh_state == UHCI_RH_RESET) {
 818
 819                 /* The controller had to be reset */
 820                 usb_root_hub_lost_power(hcd->self.root_hub);
 821                 suspend_rh(uhci, UHCI_RH_SUSPENDED);
 822         }
 823
 824         spin_unlock_irq(&uhci->lock);
 825
 826         if (!uhci->working_RD) {
 827                 /* Suspended root hub needs to be polled */
 828                 hcd->poll_rh = 1;
 829                 usb_hcd_poll_rh_status(hcd);
 830         }
 831         return 0;
 832 }
 833 #endif
 834
 835 /* Wait until a particular device/endpoint's QH is idle, and free it */
 836 static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd,
 837                 struct usb_host_endpoint *hep)
 838 {
 839         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 840         struct uhci_qh *qh;
 841
 842         spin_lock_irq(&uhci->lock);
 843         qh = (struct uhci_qh *) hep->hcpriv;
 844         if (qh == NULL)
 845                 goto done;
 846
 847         while (qh->state != QH_STATE_IDLE) {
 848                 ++uhci->num_waiting;
 849                 spin_unlock_irq(&uhci->lock);
 850                 wait_event_interruptible(uhci->waitqh,
 851                                 qh->state == QH_STATE_IDLE);
 852                 spin_lock_irq(&uhci->lock);
 853                 --uhci->num_waiting;
 854         }
 855
 856         uhci_free_qh(uhci, qh);
 857 done:
 858         spin_unlock_irq(&uhci->lock);
 859 }
 860
 861 static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
 862 {
 863         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 864         unsigned frame_number;
 865         unsigned delta;
 866
 867         /* Minimize latency by avoiding the spinlock */
 868         frame_number = uhci->frame_number;
 869         barrier();
 870         delta = (inw(uhci->io_addr + USBFRNUM) - frame_number) &
 871                         (UHCI_NUMFRAMES - 1);
 872         return frame_number + delta;
 873 }
 874
 875 static const char hcd_name[] = "uhci_hcd";
 876
 877 static const struct hc_driver uhci_driver = {
 878         .description =          hcd_name,
 879         .product_desc =         "UHCI Host Controller",
 880         .hcd_priv_size =        sizeof(struct uhci_hcd),
 881
 882         /* Generic hardware linkage */
 883         .irq =                  uhci_irq,
 884         .flags =                HCD_USB11,
 885
 886         /* Basic lifecycle operations */
 887         .reset =                uhci_init,
 888         .start =                uhci_start,
 889 #ifdef CONFIG_PM
 890         .suspend =              uhci_suspend,
 891         .resume =               uhci_resume,
 892         .bus_suspend =          uhci_rh_suspend,
 893         .bus_resume =           uhci_rh_resume,
 894 #endif
 895         .stop =                 uhci_stop,
 896
 897         .urb_enqueue =          uhci_urb_enqueue,
 898         .urb_dequeue =          uhci_urb_dequeue,
 899
 900         .endpoint_disable =     uhci_hcd_endpoint_disable,
 901         .get_frame_number =     uhci_hcd_get_frame_number,
 902
 903         .hub_status_data =      uhci_hub_status_data,
 904         .hub_control =          uhci_hub_control,
 905 };
 906
 907 static const struct pci_device_id uhci_pci_ids[] = { {
 908         /* handle any USB UHCI controller */
 909         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0),
 910         .driver_data =  (unsigned long) &uhci_driver,
 911         }, { /* end: all zeroes */ }
 912 };
 913
 914 MODULE_DEVICE_TABLE(pci, uhci_pci_ids);
 915
 916 static struct pci_driver uhci_pci_driver = {
 917         .name =         (char *)hcd_name,
 918         .id_table =     uhci_pci_ids,
 919
 920         .probe =        usb_hcd_pci_probe,
 921         .remove =       usb_hcd_pci_remove,
 922         .shutdown =     uhci_shutdown,
 923
 924 #ifdef  CONFIG_PM
 925         .suspend =      usb_hcd_pci_suspend,
 926         .resume =       usb_hcd_pci_resume,
 927 #endif  /* PM */
 928 };
 929
 930 static int __init uhci_hcd_init(void)
 931 {
 932         int retval = -ENOMEM;
 933
 934         printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION "%s\n",
 935                         ignore_oc ? ", overcurrent ignored" : "");
 936
 937         if (usb_disabled())
 938                 return -ENODEV;
 939
 940         if (DEBUG_CONFIGURED) {
 941                 errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
 942                 if (!errbuf)
 943                         goto errbuf_failed;
 944                 uhci_debugfs_root = debugfs_create_dir("uhci", NULL);
 945                 if (!uhci_debugfs_root)
 946                         goto debug_failed;
 947         }
 948
 949         uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
 950                 sizeof(struct urb_priv), 0, 0, NULL, NULL);
 951         if (!uhci_up_cachep)
 952                 goto up_failed;
 953
 954         retval = pci_register_driver(&uhci_pci_driver);
 955         if (retval)
 956                 goto init_failed;
 957
 958         return 0;
 959
 960 init_failed:
 961         kmem_cache_destroy(uhci_up_cachep);
 962
 963 up_failed:
 964         debugfs_remove(uhci_debugfs_root);
 965
 966 debug_failed:
 967         kfree(errbuf);
 968
 969 errbuf_failed:
 970
 971         return retval;
 972 }
 973
 974 static void __exit uhci_hcd_cleanup(void)
 975 {
 976         pci_unregister_driver(&uhci_pci_driver);
 977         kmem_cache_destroy(uhci_up_cachep);
 978         debugfs_remove(uhci_debugfs_root);
 979         kfree(errbuf);
 980 }
 981
 982 module_init(uhci_hcd_init);
 983 module_exit(uhci_hcd_cleanup);
 984
 985 MODULE_AUTHOR(DRIVER_AUTHOR);
 986 MODULE_DESCRIPTION(DRIVER_DESC);
 987 MODULE_LICENSE("GPL");