Initial import

1 files changed, 945 insertions, 0 deletions

diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
new file mode 100644
index 000000000..a7de8e8bb
--- /dev/null
+++ b/drivers/usb/host/uhci-hcd.c
@@ -0,0 +1,945 @@
+/*
+ * 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/usb/hcd.h>
+#include <linux/bitops.h>
+#include <linux/dmi.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "uhci-hcd.h"
+
+/*
+ * Version Information
+ */
+#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 bool 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 /sys/kernel/debug/uhci/[pci_addr]
+ * debug = 3, show all TDs in URBs when dumping
+ */
+#ifdef CONFIG_DYNAMIC_DEBUG
+
+static int debug = 1;
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug level");
+static char *errbuf;
+
+#else
+
+#define debug 0
+#define errbuf NULL
+
+#endif
+
+
+#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 __hc32 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, 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)
+		uhci_writew(uhci, 0, USBPORTSC1 + (port * 2));
+
+	uhci->port_c_suspend = uhci->resuming_ports = 0;
+	uhci->rh_state = UHCI_RH_RESET;
+	uhci->is_stopped = UHCI_IS_STOPPED;
+	clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
+}
+
+/*
+ * 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(uhci);
+	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(uhci))
+		finish_reset(uhci);
+}
+
+#if defined(CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC)
+/*
+ * The two functions below are generic reset functions that are used on systems
+ * that do not have keyboard and mouse legacy support. We assume that we are
+ * running on such a system if CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC is defined.
+ */
+
+/*
+ * Make sure the controller is completely inactive, unable to
+ * generate interrupts or do DMA.
+ */
+static void uhci_generic_reset_hc(struct uhci_hcd *uhci)
+{
+	/* Reset the HC - this will force us to get a
+	 * new notification of any already connected
+	 * ports due to the virtual disconnect that it
+	 * implies.
+	 */
+	uhci_writew(uhci, USBCMD_HCRESET, USBCMD);
+	mb();
+	udelay(5);
+	if (uhci_readw(uhci, USBCMD) & USBCMD_HCRESET)
+		dev_warn(uhci_dev(uhci), "HCRESET not completed yet!\n");
+
+	/* Just to be safe, disable interrupt requests and
+	 * make sure the controller is stopped.
+	 */
+	uhci_writew(uhci, 0, USBINTR);
+	uhci_writew(uhci, 0, USBCMD);
+}
+
+/*
+ * Initialize a controller that was newly discovered or has just been
+ * resumed.  In either case we can't be sure of its previous state.
+ *
+ * Returns: 1 if the controller was reset, 0 otherwise.
+ */
+static int uhci_generic_check_and_reset_hc(struct uhci_hcd *uhci)
+{
+	unsigned int cmd, intr;
+
+	/*
+	 * When restarting a suspended controller, we expect all the
+	 * settings to be the same as we left them:
+	 *
+	 *	Controller is stopped and configured with EGSM set;
+	 *	No interrupts enabled except possibly Resume Detect.
+	 *
+	 * If any of these conditions are violated we do a complete reset.
+	 */
+
+	cmd = uhci_readw(uhci, USBCMD);
+	if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) {
+		dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n",
+				__func__, cmd);
+		goto reset_needed;
+	}
+
+	intr = uhci_readw(uhci, USBINTR);
+	if (intr & (~USBINTR_RESUME)) {
+		dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n",
+				__func__, intr);
+		goto reset_needed;
+	}
+	return 0;
+
+reset_needed:
+	dev_dbg(uhci_dev(uhci), "Performing full reset\n");
+	uhci_generic_reset_hc(uhci);
+	return 1;
+}
+#endif /* CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC */
+
+/*
+ * 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 */
+	uhci_writeb(uhci, USBSOF_DEFAULT, USBSOF);
+
+	/* Store the frame list base address */
+	uhci_writel(uhci, uhci->frame_dma_handle, USBFLBASEADD);
+
+	/* Set the current frame number */
+	uhci_writew(uhci, uhci->frame_number & UHCI_MAX_SOF_NUMBER,
+			USBFRNUM);
+
+	/* perform any arch/bus specific configuration */
+	if (uhci->configure_hc)
+		uhci->configure_hc(uhci);
+}
+
+static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
+{
+	/* If we have to ignore overcurrent events then almost by definition
+	 * we can't depend on resume-detect interrupts. */
+	if (ignore_oc)
+		return 1;
+
+	return uhci->resume_detect_interrupts_are_broken ?
+		uhci->resume_detect_interrupts_are_broken(uhci) : 0;
+}
+
+static int global_suspend_mode_is_broken(struct uhci_hcd *uhci)
+{
+	return uhci->global_suspend_mode_is_broken ?
+		uhci->global_suspend_mode_is_broken(uhci) : 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, wakeup_enable;
+	struct usb_device *rhdev = uhci_to_hcd(uhci)->self.root_hub;
+
+	auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
+	dev_dbg(&rhdev->dev, "%s%s\n", __func__,
+			(auto_stop ? " (auto-stop)" : ""));
+
+	/* Start off by assuming Resume-Detect interrupts and EGSM work
+	 * and that remote wakeups should be enabled.
+	 */
+	egsm_enable = USBCMD_EGSM;
+	int_enable = USBINTR_RESUME;
+	wakeup_enable = 1;
+
+	/*
+	 * In auto-stop mode, we must be able to detect new connections.
+	 * The user can force us to poll by disabling remote wakeup;
+	 * otherwise we will use the EGSM/RD mechanism.
+	 */
+	if (auto_stop) {
+		if (!device_may_wakeup(&rhdev->dev))
+			egsm_enable = int_enable = 0;
+	}
+
+#ifdef CONFIG_PM
+	/*
+	 * In bus-suspend mode, we use the wakeup setting specified
+	 * for the root hub.
+	 */
+	else {
+		if (!rhdev->do_remote_wakeup)
+			wakeup_enable = 0;
+	}
+#endif
+
+	/*
+	 * UHCI doesn't distinguish between wakeup requests from downstream
+	 * devices and local connect/disconnect events.  There's no way to
+	 * enable one without the other; both are controlled by EGSM.  Thus
+	 * if wakeups are disallowed then EGSM must be turned off -- in which
+	 * case remote wakeup requests from downstream during system sleep
+	 * will be lost.
+	 *
+	 * In addition, if EGSM is broken then we can't use it.  Likewise,
+	 * if Resume-Detect interrupts are broken then we can't use them.
+	 *
+	 * Finally, neither EGSM nor RD is useful by itself.  Without EGSM,
+	 * the RD status bit will never get set.  Without RD, the controller
+	 * won't generate interrupts to tell the system about wakeup events.
+	 */
+	if (!wakeup_enable || global_suspend_mode_is_broken(uhci) ||
+			resume_detect_interrupts_are_broken(uhci))
+		egsm_enable = int_enable = 0;
+
+	uhci->RD_enable = !!int_enable;
+	uhci_writew(uhci, int_enable, USBINTR);
+	uhci_writew(uhci, egsm_enable | USBCMD_CF, 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 && !(uhci_readw(uhci, 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 (!(uhci_readw(uhci, USBSTS) & USBSTS_HCH))
+		dev_warn(uhci_dev(uhci), "Controller not stopped yet!\n");
+
+	uhci_get_current_frame_number(uhci);
+
+	uhci->rh_state = new_state;
+	uhci->is_stopped = UHCI_IS_STOPPED;
+
+	/*
+	 * If remote wakeup is enabled but either EGSM or RD interrupts
+	 * doesn't work, then we won't get an interrupt when a wakeup event
+	 * occurs.  Thus the suspended root hub needs to be polled.
+	 */
+	if (wakeup_enable && (!int_enable || !egsm_enable))
+		set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
+	else
+		clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
+
+	uhci_scan_schedule(uhci);
+	uhci_fsbr_off(uhci);
+}
+
+static void start_rh(struct uhci_hcd *uhci)
+{
+	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.
+	 */
+	uhci_writew(uhci, USBCMD_RS | USBCMD_CF | USBCMD_MAXP, USBCMD);
+	uhci_writew(uhci, USBINTR_TIMEOUT | USBINTR_RESUME |
+		USBINTR_IOC | USBINTR_SP, USBINTR);
+	mb();
+	uhci->rh_state = UHCI_RH_RUNNING;
+	set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
+}
+
+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", __func__,
+			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) {
+		unsigned egsm;
+
+		/* Keep EGSM on if it was set before */
+		egsm = uhci_readw(uhci, USBCMD) & USBCMD_EGSM;
+		uhci->rh_state = UHCI_RH_RESUMING;
+		uhci_writew(uhci, USBCMD_FGR | USBCMD_CF | egsm, 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 */
+		uhci_writew(uhci, USBCMD_CF, USBCMD);
+		mb();
+		udelay(4);
+		if (uhci_readw(uhci, 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 = uhci_readw(uhci, USBSTS);
+	if (!(status & ~USBSTS_HCH))	/* shared interrupt, not mine */
+		return IRQ_NONE;
+	uhci_writew(uhci, status, USBSTS);		/* Clear it */
+
+	spin_lock(&uhci->lock);
+	if (unlikely(!uhci->is_initialized))	/* not yet configured */
+		goto done;
+
+	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) {
+			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 - EXTRA_SPACE);
+					lprintk(errbuf);
+				}
+				uhci_hc_died(uhci);
+				usb_hc_died(hcd);
+
+				/* Force a callback in case there are
+				 * pending unlinks */
+				mod_timer(&hcd->rh_timer, jiffies);
+			}
+		}
+	}
+
+	if (status & USBSTS_RD) {
+		spin_unlock(&uhci->lock);
+		usb_hcd_poll_rh_status(hcd);
+	} else {
+		uhci_scan_schedule(uhci);
+ done:
+		spin_unlock(&uhci->lock);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Store the current frame number in uhci->frame_number if the controller
+ * is running.  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 = (uhci_readw(uhci, 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;
+
+
+	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);
+}
+
+/*
+ * 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 __maybe_unused *dentry;
+
+	hcd->uses_new_polling = 1;
+	/* Accept arbitrarily long scatter-gather lists */
+	if (!(hcd->driver->flags & HCD_LOCAL_MEM))
+		hcd->self.sg_tablesize = ~0;
+
+	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);
+
+#ifdef UHCI_DEBUG_OPS
+	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");
+		return -ENOMEM;
+	}
+	uhci->dentry = dentry;
+#endif
+
+	uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
+			UHCI_NUMFRAMES * sizeof(*uhci->frame),
+			&uhci->frame_dma_handle, GFP_KERNEL);
+	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, uhci->skel_async_qh);
+	uhci->skel_async_qh->link = UHCI_PTR_TERM(uhci);
+	uhci->skel_term_qh->link = LINK_TO_QH(uhci, uhci->skel_term_qh);
+
+	/* This dummy TD is to work around a bug in Intel PIIX controllers */
+	uhci_fill_td(uhci, uhci->term_td, 0, uhci_explen(0) |
+			(0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
+	uhci->term_td->link = UHCI_PTR_TERM(uhci);
+	uhci->skel_async_qh->element = uhci->skel_term_qh->element =
+		LINK_TO_TD(uhci, 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();
+
+	spin_lock_irq(&uhci->lock);
+	configure_hc(uhci);
+	uhci->is_initialized = 1;
+	start_rh(uhci);
+	spin_unlock_irq(&uhci->lock);
+	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);
+
+	return retval;
+}
+
+static void uhci_stop(struct usb_hcd *hcd)
+{
+	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+
+	spin_lock_irq(&uhci->lock);
+	if (HCD_HW_ACCESSIBLE(hcd) && !uhci->dead)
+		uhci_hc_died(uhci);
+	uhci_scan_schedule(uhci);
+	spin_unlock_irq(&uhci->lock);
+	synchronize_irq(hcd->irq);
+
+	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 (!HCD_HW_ACCESSIBLE(hcd))
+		rc = -ESHUTDOWN;
+	else if (uhci->dead)
+		;		/* Dead controllers tell no tales */
+
+	/* Once the controller is stopped, port resumes that are already
+	 * in progress won't complete.  Hence if remote wakeup is enabled
+	 * for the root hub and any ports are in the middle of a resume or
+	 * remote wakeup, we must fail the suspend.
+	 */
+	else if (hcd->self.root_hub->do_remote_wakeup &&
+			uhci->resuming_ports) {
+		dev_dbg(uhci_dev(uhci),
+			"suspend failed because a port is resuming\n");
+		rc = -EBUSY;
+	} else
+		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 (!HCD_HW_ACCESSIBLE(hcd))
+		rc = -ESHUTDOWN;
+	else if (!uhci->dead)
+		wakeup_rh(uhci);
+	spin_unlock_irq(&uhci->lock);
+	return rc;
+}
+
+#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 = (uhci_readw(uhci, USBFRNUM) - frame_number) &
+			(UHCI_NUMFRAMES - 1);
+	return frame_number + delta;
+}
+
+/* Determines number of ports on controller */
+static int uhci_count_ports(struct usb_hcd *hcd)
+{
+	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+	unsigned io_size = (unsigned) hcd->rsrc_len;
+	int port;
+
+	/* 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 = uhci_readw(uhci, 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;
+	}
+
+	return port;
+}
+
+static const char hcd_name[] = "uhci_hcd";
+
+#ifdef CONFIG_PCI
+#include "uhci-pci.c"
+#define	PCI_DRIVER		uhci_pci_driver
+#endif
+
+#ifdef CONFIG_SPARC_LEON
+#include "uhci-grlib.c"
+#define PLATFORM_DRIVER		uhci_grlib_driver
+#endif
+
+#ifdef CONFIG_USB_UHCI_PLATFORM
+#include "uhci-platform.c"
+#define PLATFORM_DRIVER		uhci_platform_driver
+#endif
+
+#if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER)
+#error "missing bus glue for uhci-hcd"
+#endif
+
+static int __init uhci_hcd_init(void)
+{
+	int retval = -ENOMEM;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	printk(KERN_INFO "uhci_hcd: " DRIVER_DESC "%s\n",
+			ignore_oc ? ", overcurrent ignored" : "");
+	set_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
+
+#ifdef CONFIG_DYNAMIC_DEBUG
+	errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
+	if (!errbuf)
+		goto errbuf_failed;
+	uhci_debugfs_root = debugfs_create_dir("uhci", usb_debug_root);
+	if (!uhci_debugfs_root)
+		goto debug_failed;
+#endif
+
+	uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
+		sizeof(struct urb_priv), 0, 0, NULL);
+	if (!uhci_up_cachep)
+		goto up_failed;
+
+#ifdef PLATFORM_DRIVER
+	retval = platform_driver_register(&PLATFORM_DRIVER);
+	if (retval < 0)
+		goto clean0;
+#endif
+
+#ifdef PCI_DRIVER
+	retval = pci_register_driver(&PCI_DRIVER);
+	if (retval < 0)
+		goto clean1;
+#endif
+
+	return 0;
+
+#ifdef PCI_DRIVER
+clean1:
+#endif
+#ifdef PLATFORM_DRIVER
+	platform_driver_unregister(&PLATFORM_DRIVER);
+clean0:
+#endif
+	kmem_cache_destroy(uhci_up_cachep);
+
+up_failed:
+#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
+	debugfs_remove(uhci_debugfs_root);
+
+debug_failed:
+	kfree(errbuf);
+
+errbuf_failed:
+#endif
+
+	clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
+	return retval;
+}
+
+static void __exit uhci_hcd_cleanup(void) 
+{
+#ifdef PLATFORM_DRIVER
+	platform_driver_unregister(&PLATFORM_DRIVER);
+#endif
+#ifdef PCI_DRIVER
+	pci_unregister_driver(&PCI_DRIVER);
+#endif
+	kmem_cache_destroy(uhci_up_cachep);
+	debugfs_remove(uhci_debugfs_root);
+#ifdef CONFIG_DYNAMIC_DEBUG
+	kfree(errbuf);
+#endif
+	clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
+}
+
+module_init(uhci_hcd_init);
+module_exit(uhci_hcd_cleanup);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");