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uhci-hcd.c

/*
 * Universal Host Controller Interface driver for USB.
 *
 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
 *
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
 * (C) Copyright 1999 Randy Dunlap
 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
 *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
 *
 * Intel documents this fairly well, and as far as I know there
 * are no royalties or anything like that, but even so there are
 * people who decided that they want to do the same thing in a
 * completely different way.
 *
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <linux/pm.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/usb.h>
#include <linux/bitops.h>
#include <linux/dmi.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>

#include "../core/hcd.h"
#include "uhci-hcd.h"
#include "pci-quirks.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v3.0"
#define DRIVER_AUTHOR "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, \
Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, Roman Weissgaerber, \
Alan Stern"
#define DRIVER_DESC "USB Universal Host Controller Interface driver"

/* for flakey hardware, ignore overcurrent indicators */
static int ignore_oc;
module_param(ignore_oc, bool, S_IRUGO);
MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications");

/*
 * debug = 0, no debugging messages
 * debug = 1, dump failed URBs except for stalls
 * debug = 2, dump all failed URBs (including stalls)
 *            show all queues in /debug/uhci/[pci_addr]
 * debug = 3, show all TDs in URBs when dumping
 */
#ifdef DEBUG
#define DEBUG_CONFIGURED      1
static int debug = 1;
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug level");

#else
#define DEBUG_CONFIGURED      0
#define debug                 0
#endif

static char *errbuf;
#define ERRBUF_LEN    (32 * 1024)

static struct kmem_cache *uhci_up_cachep; /* urb_priv */

static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state);
static void wakeup_rh(struct uhci_hcd *uhci);
static void uhci_get_current_frame_number(struct uhci_hcd *uhci);

/*
 * Calculate the link pointer DMA value for the first Skeleton QH in a frame.
 */
static __le32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame)
{
      int skelnum;

      /*
       * The interrupt queues will be interleaved as evenly as possible.
       * There's not much to be done about period-1 interrupts; they have
       * to occur in every frame.  But we can schedule period-2 interrupts
       * in odd-numbered frames, period-4 interrupts in frames congruent
       * to 2 (mod 4), and so on.  This way each frame only has two
       * interrupt QHs, which will help spread out bandwidth utilization.
       *
       * ffs (Find First bit Set) does exactly what we need:
       * 1,3,5,...  => ffs = 0 => use period-2 QH = skelqh[8],
       * 2,6,10,... => ffs = 1 => use period-4 QH = skelqh[7], etc.
       * ffs >= 7 => not on any high-period queue, so use
       *    period-1 QH = skelqh[9].
       * Add in UHCI_NUMFRAMES to insure at least one bit is set.
       */
      skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES);
      if (skelnum <= 1)
            skelnum = 9;
      return LINK_TO_QH(uhci->skelqh[skelnum]);
}

#include "uhci-debug.c"
#include "uhci-q.c"
#include "uhci-hub.c"

/*
 * Finish up a host controller reset and update the recorded state.
 */
static void finish_reset(struct uhci_hcd *uhci)
{
      int port;

      /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
       * bits in the port status and control registers.
       * We have to clear them by hand.
       */
      for (port = 0; port < uhci->rh_numports; ++port)
            outw(0, uhci->io_addr + USBPORTSC1 + (port * 2));

      uhci->port_c_suspend = uhci->resuming_ports = 0;
      uhci->rh_state = UHCI_RH_RESET;
      uhci->is_stopped = UHCI_IS_STOPPED;
      uhci_to_hcd(uhci)->state = HC_STATE_HALT;
      uhci_to_hcd(uhci)->poll_rh = 0;

      uhci->dead = 0;         /* Full reset resurrects the controller */
}

/*
 * Last rites for a defunct/nonfunctional controller
 * or one we don't want to use any more.
 */
static void uhci_hc_died(struct uhci_hcd *uhci)
{
      uhci_get_current_frame_number(uhci);
      uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
      finish_reset(uhci);
      uhci->dead = 1;

      /* The current frame may already be partway finished */
      ++uhci->frame_number;
}

/*
 * Initialize a controller that was newly discovered or has lost power
 * or otherwise been reset while it was suspended.  In none of these cases
 * can we be sure of its previous state.
 */
static void check_and_reset_hc(struct uhci_hcd *uhci)
{
      if (uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr))
            finish_reset(uhci);
}

/*
 * Store the basic register settings needed by the controller.
 */
static void configure_hc(struct uhci_hcd *uhci)
{
      /* Set the frame length to the default: 1 ms exactly */
      outb(USBSOF_DEFAULT, uhci->io_addr + USBSOF);

      /* Store the frame list base address */
      outl(uhci->frame_dma_handle, uhci->io_addr + USBFLBASEADD);

      /* Set the current frame number */
      outw(uhci->frame_number & UHCI_MAX_SOF_NUMBER,
                  uhci->io_addr + USBFRNUM);

      /* Mark controller as not halted before we enable interrupts */
      uhci_to_hcd(uhci)->state = HC_STATE_SUSPENDED;
      mb();

      /* Enable PIRQ */
      pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP,
                  USBLEGSUP_DEFAULT);
}


static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
{
      int port;

      /* If we have to ignore overcurrent events then almost by definition
       * we can't depend on resume-detect interrupts. */
      if (ignore_oc)
            return 1;

      switch (to_pci_dev(uhci_dev(uhci))->vendor) {
          default:
            break;

          case PCI_VENDOR_ID_GENESYS:
            /* Genesys Logic's GL880S controllers don't generate
             * resume-detect interrupts.
             */
            return 1;

          case PCI_VENDOR_ID_INTEL:
            /* Some of Intel's USB controllers have a bug that causes
             * resume-detect interrupts if any port has an over-current
             * condition.  To make matters worse, some motherboards
             * hardwire unused USB ports' over-current inputs active!
             * To prevent problems, we will not enable resume-detect
             * interrupts if any ports are OC.
             */
            for (port = 0; port < uhci->rh_numports; ++port) {
                  if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
                              USBPORTSC_OC)
                        return 1;
            }
            break;
      }
      return 0;
}

static int remote_wakeup_is_broken(struct uhci_hcd *uhci)
{
      int port;
      const char *sys_info;
      static char bad_Asus_board[] = "A7V8X";

      /* One of Asus's motherboards has a bug which causes it to
       * wake up immediately from suspend-to-RAM if any of the ports
       * are connected.  In such cases we will not set EGSM.
       */
      sys_info = dmi_get_system_info(DMI_BOARD_NAME);
      if (sys_info && !strcmp(sys_info, bad_Asus_board)) {
            for (port = 0; port < uhci->rh_numports; ++port) {
                  if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
                              USBPORTSC_CCS)
                        return 1;
            }
      }

      return 0;
}

static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
__releases(uhci->lock)
__acquires(uhci->lock)
{
      int auto_stop;
      int int_enable, egsm_enable;

      auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
      dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
                  "%s%s\n", __FUNCTION__,
                  (auto_stop ? " (auto-stop)" : ""));

      /* If we get a suspend request when we're already auto-stopped
       * then there's nothing to do.
       */
      if (uhci->rh_state == UHCI_RH_AUTO_STOPPED) {
            uhci->rh_state = new_state;
            return;
      }

      /* Enable resume-detect interrupts if they work.
       * Then enter Global Suspend mode if _it_ works, still configured.
       */
      egsm_enable = USBCMD_EGSM;
      uhci->working_RD = 1;
      int_enable = USBINTR_RESUME;
      if (remote_wakeup_is_broken(uhci))
            egsm_enable = 0;
      if (resume_detect_interrupts_are_broken(uhci) || !egsm_enable ||
                  !device_may_wakeup(
                        &uhci_to_hcd(uhci)->self.root_hub->dev))
            uhci->working_RD = int_enable = 0;

      outw(int_enable, uhci->io_addr + USBINTR);
      outw(egsm_enable | USBCMD_CF, uhci->io_addr + USBCMD);
      mb();
      udelay(5);

      /* If we're auto-stopping then no devices have been attached
       * for a while, so there shouldn't be any active URBs and the
       * controller should stop after a few microseconds.  Otherwise
       * we will give the controller one frame to stop.
       */
      if (!auto_stop && !(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) {
            uhci->rh_state = UHCI_RH_SUSPENDING;
            spin_unlock_irq(&uhci->lock);
            msleep(1);
            spin_lock_irq(&uhci->lock);
            if (uhci->dead)
                  return;
      }
      if (!(inw(uhci->io_addr + USBSTS) & USBSTS_HCH))
            dev_warn(&uhci_to_hcd(uhci)->self.root_hub->dev,
                  "Controller not stopped yet!\n");

      uhci_get_current_frame_number(uhci);

      uhci->rh_state = new_state;
      uhci->is_stopped = UHCI_IS_STOPPED;
      uhci_to_hcd(uhci)->poll_rh = !int_enable;

      uhci_scan_schedule(uhci);
      uhci_fsbr_off(uhci);
}

static void start_rh(struct uhci_hcd *uhci)
{
      uhci_to_hcd(uhci)->state = HC_STATE_RUNNING;
      uhci->is_stopped = 0;

      /* Mark it configured and running with a 64-byte max packet.
       * All interrupts are enabled, even though RESUME won't do anything.
       */
      outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, uhci->io_addr + USBCMD);
      outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP,
                  uhci->io_addr + USBINTR);
      mb();
      uhci->rh_state = UHCI_RH_RUNNING;
      uhci_to_hcd(uhci)->poll_rh = 1;
}

static void wakeup_rh(struct uhci_hcd *uhci)
__releases(uhci->lock)
__acquires(uhci->lock)
{
      dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
                  "%s%s\n", __FUNCTION__,
                  uhci->rh_state == UHCI_RH_AUTO_STOPPED ?
                        " (auto-start)" : "");

      /* If we are auto-stopped then no devices are attached so there's
       * no need for wakeup signals.  Otherwise we send Global Resume
       * for 20 ms.
       */
      if (uhci->rh_state == UHCI_RH_SUSPENDED) {
            uhci->rh_state = UHCI_RH_RESUMING;
            outw(USBCMD_FGR | USBCMD_EGSM | USBCMD_CF,
                        uhci->io_addr + USBCMD);
            spin_unlock_irq(&uhci->lock);
            msleep(20);
            spin_lock_irq(&uhci->lock);
            if (uhci->dead)
                  return;

            /* End Global Resume and wait for EOP to be sent */
            outw(USBCMD_CF, uhci->io_addr + USBCMD);
            mb();
            udelay(4);
            if (inw(uhci->io_addr + USBCMD) & USBCMD_FGR)
                  dev_warn(uhci_dev(uhci), "FGR not stopped yet!\n");
      }

      start_rh(uhci);

      /* Restart root hub polling */
      mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
}

static irqreturn_t uhci_irq(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      unsigned short status;

      /*
       * Read the interrupt status, and write it back to clear the
       * interrupt cause.  Contrary to the UHCI specification, the
       * "HC Halted" status bit is persistent: it is RO, not R/WC.
       */
      status = inw(uhci->io_addr + USBSTS);
      if (!(status & ~USBSTS_HCH))  /* shared interrupt, not mine */
            return IRQ_NONE;
      outw(status, uhci->io_addr + USBSTS);           /* Clear it */

      if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
            if (status & USBSTS_HSE)
                  dev_err(uhci_dev(uhci), "host system error, "
                              "PCI problems?\n");
            if (status & USBSTS_HCPE)
                  dev_err(uhci_dev(uhci), "host controller process "
                              "error, something bad happened!\n");
            if (status & USBSTS_HCH) {
                  spin_lock(&uhci->lock);
                  if (uhci->rh_state >= UHCI_RH_RUNNING) {
                        dev_err(uhci_dev(uhci),
                              "host controller halted, "
                              "very bad!\n");
                        if (debug > 1 && errbuf) {
                              /* Print the schedule for debugging */
                              uhci_sprint_schedule(uhci,
                                          errbuf, ERRBUF_LEN);
                              lprintk(errbuf);
                        }
                        uhci_hc_died(uhci);

                        /* Force a callback in case there are
                         * pending unlinks */
                        mod_timer(&hcd->rh_timer, jiffies);
                  }
                  spin_unlock(&uhci->lock);
            }
      }

      if (status & USBSTS_RD)
            usb_hcd_poll_rh_status(hcd);
      else {
            spin_lock(&uhci->lock);
            uhci_scan_schedule(uhci);
            spin_unlock(&uhci->lock);
      }

      return IRQ_HANDLED;
}

/*
 * Store the current frame number in uhci->frame_number if the controller
 * is runnning.  Expand from 11 bits (of which we use only 10) to a
 * full-sized integer.
 *
 * Like many other parts of the driver, this code relies on being polled
 * more than once per second as long as the controller is running.
 */
static void uhci_get_current_frame_number(struct uhci_hcd *uhci)
{
      if (!uhci->is_stopped) {
            unsigned delta;

            delta = (inw(uhci->io_addr + USBFRNUM) - uhci->frame_number) &
                        (UHCI_NUMFRAMES - 1);
            uhci->frame_number += delta;
      }
}

/*
 * De-allocate all resources
 */
static void release_uhci(struct uhci_hcd *uhci)
{
      int i;

      if (DEBUG_CONFIGURED) {
            spin_lock_irq(&uhci->lock);
            uhci->is_initialized = 0;
            spin_unlock_irq(&uhci->lock);

            debugfs_remove(uhci->dentry);
      }

      for (i = 0; i < UHCI_NUM_SKELQH; i++)
            uhci_free_qh(uhci, uhci->skelqh[i]);

      uhci_free_td(uhci, uhci->term_td);

      dma_pool_destroy(uhci->qh_pool);

      dma_pool_destroy(uhci->td_pool);

      kfree(uhci->frame_cpu);

      dma_free_coherent(uhci_dev(uhci),
                  UHCI_NUMFRAMES * sizeof(*uhci->frame),
                  uhci->frame, uhci->frame_dma_handle);
}

static int uhci_init(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      unsigned io_size = (unsigned) hcd->rsrc_len;
      int port;

      uhci->io_addr = (unsigned long) hcd->rsrc_start;

      /* The UHCI spec says devices must have 2 ports, and goes on to say
       * they may have more but gives no way to determine how many there
       * are.  However according to the UHCI spec, Bit 7 of the port
       * status and control register is always set to 1.  So we try to
       * use this to our advantage.  Another common failure mode when
       * a nonexistent register is addressed is to return all ones, so
       * we test for that also.
       */
      for (port = 0; port < (io_size - USBPORTSC1) / 2; port++) {
            unsigned int portstatus;

            portstatus = inw(uhci->io_addr + USBPORTSC1 + (port * 2));
            if (!(portstatus & 0x0080) || portstatus == 0xffff)
                  break;
      }
      if (debug)
            dev_info(uhci_dev(uhci), "detected %d ports\n", port);

      /* Anything greater than 7 is weird so we'll ignore it. */
      if (port > UHCI_RH_MAXCHILD) {
            dev_info(uhci_dev(uhci), "port count misdetected? "
                        "forcing to 2 ports\n");
            port = 2;
      }
      uhci->rh_numports = port;

      /* Kick BIOS off this hardware and reset if the controller
       * isn't already safely quiescent.
       */
      check_and_reset_hc(uhci);
      return 0;
}

/* Make sure the controller is quiescent and that we're not using it
 * any more.  This is mainly for the benefit of programs which, like kexec,
 * expect the hardware to be idle: not doing DMA or generating IRQs.
 *
 * This routine may be called in a damaged or failing kernel.  Hence we
 * do not acquire the spinlock before shutting down the controller.
 */
static void uhci_shutdown(struct pci_dev *pdev)
{
      struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev);

      uhci_hc_died(hcd_to_uhci(hcd));
}

/*
 * Allocate a frame list, and then setup the skeleton
 *
 * The hardware doesn't really know any difference
 * in the queues, but the order does matter for the
 * protocols higher up.  The order in which the queues
 * are encountered by the hardware is:
 *
 *  - All isochronous events are handled before any
 *    of the queues. We don't do that here, because
 *    we'll create the actual TD entries on demand.
 *  - The first queue is the high-period interrupt queue.
 *  - The second queue is the period-1 interrupt and async
 *    (low-speed control, full-speed control, then bulk) queue.
 *  - The third queue is the terminating bandwidth reclamation queue,
 *    which contains no members, loops back to itself, and is present
 *    only when FSBR is on and there are no full-speed control or bulk QHs.
 */
static int uhci_start(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      int retval = -EBUSY;
      int i;
      struct dentry *dentry;

      hcd->uses_new_polling = 1;

      spin_lock_init(&uhci->lock);
      setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
                  (unsigned long) uhci);
      INIT_LIST_HEAD(&uhci->idle_qh_list);
      init_waitqueue_head(&uhci->waitqh);

      if (DEBUG_CONFIGURED) {
            dentry = debugfs_create_file(hcd->self.bus_name,
                        S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,
                        uhci, &uhci_debug_operations);
            if (!dentry) {
                  dev_err(uhci_dev(uhci), "couldn't create uhci "
                              "debugfs entry\n");
                  retval = -ENOMEM;
                  goto err_create_debug_entry;
            }
            uhci->dentry = dentry;
      }

      uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
                  UHCI_NUMFRAMES * sizeof(*uhci->frame),
                  &uhci->frame_dma_handle, 0);
      if (!uhci->frame) {
            dev_err(uhci_dev(uhci), "unable to allocate "
                        "consistent memory for frame list\n");
            goto err_alloc_frame;
      }
      memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));

      uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
                  GFP_KERNEL);
      if (!uhci->frame_cpu) {
            dev_err(uhci_dev(uhci), "unable to allocate "
                        "memory for frame pointers\n");
            goto err_alloc_frame_cpu;
      }

      uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci),
                  sizeof(struct uhci_td), 16, 0);
      if (!uhci->td_pool) {
            dev_err(uhci_dev(uhci), "unable to create td dma_pool\n");
            goto err_create_td_pool;
      }

      uhci->qh_pool = dma_pool_create("uhci_qh", uhci_dev(uhci),
                  sizeof(struct uhci_qh), 16, 0);
      if (!uhci->qh_pool) {
            dev_err(uhci_dev(uhci), "unable to create qh dma_pool\n");
            goto err_create_qh_pool;
      }

      uhci->term_td = uhci_alloc_td(uhci);
      if (!uhci->term_td) {
            dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n");
            goto err_alloc_term_td;
      }

      for (i = 0; i < UHCI_NUM_SKELQH; i++) {
            uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL);
            if (!uhci->skelqh[i]) {
                  dev_err(uhci_dev(uhci), "unable to allocate QH\n");
                  goto err_alloc_skelqh;
            }
      }

      /*
       * 8 Interrupt queues; link all higher int queues to int1 = async
       */
      for (i = SKEL_ISO + 1; i < SKEL_ASYNC; ++i)
            uhci->skelqh[i]->link = LINK_TO_QH(uhci->skel_async_qh);
      uhci->skel_async_qh->link = UHCI_PTR_TERM;
      uhci->skel_term_qh->link = LINK_TO_QH(uhci->skel_term_qh);

      /* This dummy TD is to work around a bug in Intel PIIX controllers */
      uhci_fill_td(uhci->term_td, 0, uhci_explen(0) |
                  (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
      uhci->term_td->link = UHCI_PTR_TERM;
      uhci->skel_async_qh->element = uhci->skel_term_qh->element =
                  LINK_TO_TD(uhci->term_td);

      /*
       * Fill the frame list: make all entries point to the proper
       * interrupt queue.
       */
      for (i = 0; i < UHCI_NUMFRAMES; i++) {

            /* Only place we don't use the frame list routines */
            uhci->frame[i] = uhci_frame_skel_link(uhci, i);
      }

      /*
       * Some architectures require a full mb() to enforce completion of
       * the memory writes above before the I/O transfers in configure_hc().
       */
      mb();

      configure_hc(uhci);
      uhci->is_initialized = 1;
      start_rh(uhci);
      return 0;

/*
 * error exits:
 */
err_alloc_skelqh:
      for (i = 0; i < UHCI_NUM_SKELQH; i++) {
            if (uhci->skelqh[i])
                  uhci_free_qh(uhci, uhci->skelqh[i]);
      }

      uhci_free_td(uhci, uhci->term_td);

err_alloc_term_td:
      dma_pool_destroy(uhci->qh_pool);

err_create_qh_pool:
      dma_pool_destroy(uhci->td_pool);

err_create_td_pool:
      kfree(uhci->frame_cpu);

err_alloc_frame_cpu:
      dma_free_coherent(uhci_dev(uhci),
                  UHCI_NUMFRAMES * sizeof(*uhci->frame),
                  uhci->frame, uhci->frame_dma_handle);

err_alloc_frame:
      debugfs_remove(uhci->dentry);

err_create_debug_entry:
      return retval;
}

static void uhci_stop(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);

      spin_lock_irq(&uhci->lock);
      if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead)
            uhci_hc_died(uhci);
      uhci_scan_schedule(uhci);
      spin_unlock_irq(&uhci->lock);

      del_timer_sync(&uhci->fsbr_timer);
      release_uhci(uhci);
}

#ifdef CONFIG_PM
static int uhci_rh_suspend(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      int rc = 0;

      spin_lock_irq(&uhci->lock);
      if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
            rc = -ESHUTDOWN;
      else if (!uhci->dead)
            suspend_rh(uhci, UHCI_RH_SUSPENDED);
      spin_unlock_irq(&uhci->lock);
      return rc;
}

static int uhci_rh_resume(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      int rc = 0;

      spin_lock_irq(&uhci->lock);
      if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
            rc = -ESHUTDOWN;
      else if (!uhci->dead)
            wakeup_rh(uhci);
      spin_unlock_irq(&uhci->lock);
      return rc;
}

static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      int rc = 0;

      dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__);

      spin_lock_irq(&uhci->lock);
      if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
            goto done_okay;         /* Already suspended or dead */

      if (uhci->rh_state > UHCI_RH_SUSPENDED) {
            dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n");
            rc = -EBUSY;
            goto done;
      };

      /* All PCI host controllers are required to disable IRQ generation
       * at the source, so we must turn off PIRQ.
       */
      pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
      mb();
      hcd->poll_rh = 0;

      /* FIXME: Enable non-PME# remote wakeup? */

      /* make sure snapshot being resumed re-enumerates everything */
      if (message.event == PM_EVENT_PRETHAW)
            uhci_hc_died(uhci);

done_okay:
      clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
done:
      spin_unlock_irq(&uhci->lock);
      return rc;
}

static int uhci_resume(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);

      dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__);

      /* Since we aren't in D3 any more, it's safe to set this flag
       * even if the controller was dead.
       */
      set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
      mb();

      spin_lock_irq(&uhci->lock);

      /* FIXME: Disable non-PME# remote wakeup? */

      /* The firmware or a boot kernel may have changed the controller
       * settings during a system wakeup.  Check it and reconfigure
       * to avoid problems.
       */
      check_and_reset_hc(uhci);

      /* If the controller was dead before, it's back alive now */
      configure_hc(uhci);

      if (uhci->rh_state == UHCI_RH_RESET) {

            /* The controller had to be reset */
            usb_root_hub_lost_power(hcd->self.root_hub);
            suspend_rh(uhci, UHCI_RH_SUSPENDED);
      }

      spin_unlock_irq(&uhci->lock);

      if (!uhci->working_RD) {
            /* Suspended root hub needs to be polled */
            hcd->poll_rh = 1;
            usb_hcd_poll_rh_status(hcd);
      }
      return 0;
}
#endif

/* Wait until a particular device/endpoint's QH is idle, and free it */
static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd,
            struct usb_host_endpoint *hep)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      struct uhci_qh *qh;

      spin_lock_irq(&uhci->lock);
      qh = (struct uhci_qh *) hep->hcpriv;
      if (qh == NULL)
            goto done;

      while (qh->state != QH_STATE_IDLE) {
            ++uhci->num_waiting;
            spin_unlock_irq(&uhci->lock);
            wait_event_interruptible(uhci->waitqh,
                        qh->state == QH_STATE_IDLE);
            spin_lock_irq(&uhci->lock);
            --uhci->num_waiting;
      }

      uhci_free_qh(uhci, qh);
done:
      spin_unlock_irq(&uhci->lock);
}

static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
{
      struct uhci_hcd *uhci = hcd_to_uhci(hcd);
      unsigned frame_number;
      unsigned delta;

      /* Minimize latency by avoiding the spinlock */
      frame_number = uhci->frame_number;
      barrier();
      delta = (inw(uhci->io_addr + USBFRNUM) - frame_number) &
                  (UHCI_NUMFRAMES - 1);
      return frame_number + delta;
}

static const char hcd_name[] = "uhci_hcd";

static const struct hc_driver uhci_driver = {
      .description =          hcd_name,
      .product_desc =         "UHCI Host Controller",
      .hcd_priv_size =  sizeof(struct uhci_hcd),

      /* Generic hardware linkage */
      .irq =                  uhci_irq,
      .flags =          HCD_USB11,

      /* Basic lifecycle operations */
      .reset =          uhci_init,
      .start =          uhci_start,
#ifdef CONFIG_PM
      .suspend =        uhci_suspend,
      .resume =         uhci_resume,
      .bus_suspend =          uhci_rh_suspend,
      .bus_resume =           uhci_rh_resume,
#endif
      .stop =                 uhci_stop,

      .urb_enqueue =          uhci_urb_enqueue,
      .urb_dequeue =          uhci_urb_dequeue,

      .endpoint_disable =     uhci_hcd_endpoint_disable,
      .get_frame_number =     uhci_hcd_get_frame_number,

      .hub_status_data =      uhci_hub_status_data,
      .hub_control =          uhci_hub_control,
};

static const struct pci_device_id uhci_pci_ids[] = { {
      /* handle any USB UHCI controller */
      PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0),
      .driver_data =    (unsigned long) &uhci_driver,
      }, { /* end: all zeroes */ }
};

MODULE_DEVICE_TABLE(pci, uhci_pci_ids);

static struct pci_driver uhci_pci_driver = {
      .name =           (char *)hcd_name,
      .id_table = uhci_pci_ids,

      .probe =    usb_hcd_pci_probe,
      .remove =   usb_hcd_pci_remove,
      .shutdown = uhci_shutdown,

#ifdef      CONFIG_PM
      .suspend =  usb_hcd_pci_suspend,
      .resume =   usb_hcd_pci_resume,
#endif      /* PM */
};
 
static int __init uhci_hcd_init(void)
{
      int retval = -ENOMEM;

      printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION "%s\n",
                  ignore_oc ? ", overcurrent ignored" : "");

      if (usb_disabled())
            return -ENODEV;

      if (DEBUG_CONFIGURED) {
            errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
            if (!errbuf)
                  goto errbuf_failed;
            uhci_debugfs_root = debugfs_create_dir("uhci", NULL);
            if (!uhci_debugfs_root)
                  goto debug_failed;
      }

      uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
            sizeof(struct urb_priv), 0, 0, NULL);
      if (!uhci_up_cachep)
            goto up_failed;

      retval = pci_register_driver(&uhci_pci_driver);
      if (retval)
            goto init_failed;

      return 0;

init_failed:
      kmem_cache_destroy(uhci_up_cachep);

up_failed:
      debugfs_remove(uhci_debugfs_root);

debug_failed:
      kfree(errbuf);

errbuf_failed:

      return retval;
}

static void __exit uhci_hcd_cleanup(void) 
{
      pci_unregister_driver(&uhci_pci_driver);
      kmem_cache_destroy(uhci_up_cachep);
      debugfs_remove(uhci_debugfs_root);
      kfree(errbuf);
}

module_init(uhci_hcd_init);
module_exit(uhci_hcd_cleanup);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

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