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linux/drivers/usb/host/ohci-hcd.c
Linus Torvalds 033d9959ed Merge branch 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 
Pull workqueue changes from Tejun Heo:
 "This is workqueue updates for v3.7-rc1.  A lot of activities this
  round including considerable API and behavior cleanups.

   * delayed_work combines a timer and a work item.  The handling of the
     timer part has always been a bit clunky leading to confusing
     cancelation API with weird corner-case behaviors.  delayed_work is
     updated to use new IRQ safe timer and cancelation now works as
     expected.

   * Another deficiency of delayed_work was lack of the counterpart of
     mod_timer() which led to cancel+queue combinations or open-coded
     timer+work usages.  mod_delayed_work[_on]() are added.

     These two delayed_work changes make delayed_work provide interface
     and behave like timer which is executed with process context.

   * A work item could be executed concurrently on multiple CPUs, which
     is rather unintuitive and made flush_work() behavior confusing and
     half-broken under certain circumstances.  This problem doesn't
     exist for non-reentrant workqueues.  While non-reentrancy check
     isn't free, the overhead is incurred only when a work item bounces
     across different CPUs and even in simulated pathological scenario
     the overhead isn't too high.

     All workqueues are made non-reentrant.  This removes the
     distinction between flush_[delayed_]work() and
     flush_[delayed_]_work_sync().  The former is now as strong as the
     latter and the specified work item is guaranteed to have finished
     execution of any previous queueing on return.

   * In addition to the various bug fixes, Lai redid and simplified CPU
     hotplug handling significantly.

   * Joonsoo introduced system_highpri_wq and used it during CPU
     hotplug.

  There are two merge commits - one to pull in IRQ safe timer from
  tip/timers/core and the other to pull in CPU hotplug fixes from
  wq/for-3.6-fixes as Lai's hotplug restructuring depended on them."

Fixed a number of trivial conflicts, but the more interesting conflicts
were silent ones where the deprecated interfaces had been used by new
code in the merge window, and thus didn't cause any real data conflicts.

Tejun pointed out a few of them, I fixed a couple more.

* 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (46 commits)
  workqueue: remove spurious WARN_ON_ONCE(in_irq()) from try_to_grab_pending()
  workqueue: use cwq_set_max_active() helper for workqueue_set_max_active()
  workqueue: introduce cwq_set_max_active() helper for thaw_workqueues()
  workqueue: remove @delayed from cwq_dec_nr_in_flight()
  workqueue: fix possible stall on try_to_grab_pending() of a delayed work item
  workqueue: use hotcpu_notifier() for workqueue_cpu_down_callback()
  workqueue: use __cpuinit instead of __devinit for cpu callbacks
  workqueue: rename manager_mutex to assoc_mutex
  workqueue: WORKER_REBIND is no longer necessary for idle rebinding
  workqueue: WORKER_REBIND is no longer necessary for busy rebinding
  workqueue: reimplement idle worker rebinding
  workqueue: deprecate __cancel_delayed_work()
  workqueue: reimplement cancel_delayed_work() using try_to_grab_pending()
  workqueue: use mod_delayed_work() instead of __cancel + queue
  workqueue: use irqsafe timer for delayed_work
  workqueue: clean up delayed_work initializers and add missing one
  workqueue: make deferrable delayed_work initializer names consistent
  workqueue: cosmetic whitespace updates for macro definitions
  workqueue: deprecate system_nrt[_freezable]_wq
  workqueue: deprecate flush[_delayed]_work_sync()
  ...
2012-10-02 09:54:49 -07:00

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/*
* Open Host Controller Interface (OHCI) driver for USB.
*
* Maintainer: Alan Stern <stern@rowland.harvard.edu>
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
*
* [ Initialisation is based on Linus' ]
* [ uhci code and gregs ohci fragments ]
* [ (C) Copyright 1999 Linus Torvalds ]
* [ (C) Copyright 1999 Gregory P. Smith]
*
*
* OHCI is the main "non-Intel/VIA" standard for USB 1.1 host controller
* interfaces (though some non-x86 Intel chips use it). It supports
* smarter hardware than UHCI. A download link for the spec available
* through the http://www.usb.org website.
*
* This file is licenced under the GPL.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include <linux/usb/hcd.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#define DRIVER_AUTHOR "Roman Weissgaerber, David Brownell"
#define DRIVER_DESC "USB 1.1 'Open' Host Controller (OHCI) Driver"
/*-------------------------------------------------------------------------*/
#undef OHCI_VERBOSE_DEBUG /* not always helpful */
/* For initializing controller (mask in an HCFS mode too) */
#define OHCI_CONTROL_INIT OHCI_CTRL_CBSR
#define OHCI_INTR_INIT \
(OHCI_INTR_MIE | OHCI_INTR_RHSC | OHCI_INTR_UE \
| OHCI_INTR_RD | OHCI_INTR_WDH)
#ifdef __hppa__
/* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
#define IR_DISABLE
#endif
#ifdef CONFIG_ARCH_OMAP
/* OMAP doesn't support IR (no SMM; not needed) */
#define IR_DISABLE
#endif
/*-------------------------------------------------------------------------*/
static const char hcd_name [] = "ohci_hcd";
#define STATECHANGE_DELAY msecs_to_jiffies(300)
#include "ohci.h"
#include "pci-quirks.h"
static void ohci_dump (struct ohci_hcd *ohci, int verbose);
static int ohci_init (struct ohci_hcd *ohci);
static void ohci_stop (struct usb_hcd *hcd);
#if defined(CONFIG_PM) || defined(CONFIG_PCI)
static int ohci_restart (struct ohci_hcd *ohci);
#endif
#ifdef CONFIG_PCI
static void sb800_prefetch(struct ohci_hcd *ohci, int on);
#else
static inline void sb800_prefetch(struct ohci_hcd *ohci, int on)
{
return;
}
#endif
#include "ohci-hub.c"
#include "ohci-dbg.c"
#include "ohci-mem.c"
#include "ohci-q.c"
/*
* On architectures with edge-triggered interrupts we must never return
* IRQ_NONE.
*/
#if defined(CONFIG_SA1111) /* ... or other edge-triggered systems */
#define IRQ_NOTMINE IRQ_HANDLED
#else
#define IRQ_NOTMINE IRQ_NONE
#endif
/* Some boards misreport power switching/overcurrent */
static bool distrust_firmware = 1;
module_param (distrust_firmware, bool, 0);
MODULE_PARM_DESC (distrust_firmware,
"true to distrust firmware power/overcurrent setup");
/* Some boards leave IR set wrongly, since they fail BIOS/SMM handshakes */
static bool no_handshake = 0;
module_param (no_handshake, bool, 0);
MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
/*-------------------------------------------------------------------------*/
/*
* queue up an urb for anything except the root hub
*/
static int ohci_urb_enqueue (
struct usb_hcd *hcd,
struct urb *urb,
gfp_t mem_flags
) {
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
struct ed *ed;
urb_priv_t *urb_priv;
unsigned int pipe = urb->pipe;
int i, size = 0;
unsigned long flags;
int retval = 0;
#ifdef OHCI_VERBOSE_DEBUG
urb_print(urb, "SUB", usb_pipein(pipe), -EINPROGRESS);
#endif
/* every endpoint has a ed, locate and maybe (re)initialize it */
if (! (ed = ed_get (ohci, urb->ep, urb->dev, pipe, urb->interval)))
return -ENOMEM;
/* for the private part of the URB we need the number of TDs (size) */
switch (ed->type) {
case PIPE_CONTROL:
/* td_submit_urb() doesn't yet handle these */
if (urb->transfer_buffer_length > 4096)
return -EMSGSIZE;
/* 1 TD for setup, 1 for ACK, plus ... */
size = 2;
/* FALLTHROUGH */
// case PIPE_INTERRUPT:
// case PIPE_BULK:
default:
/* one TD for every 4096 Bytes (can be up to 8K) */
size += urb->transfer_buffer_length / 4096;
/* ... and for any remaining bytes ... */
if ((urb->transfer_buffer_length % 4096) != 0)
size++;
/* ... and maybe a zero length packet to wrap it up */
if (size == 0)
size++;
else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
&& (urb->transfer_buffer_length
% usb_maxpacket (urb->dev, pipe,
usb_pipeout (pipe))) == 0)
size++;
break;
case PIPE_ISOCHRONOUS: /* number of packets from URB */
size = urb->number_of_packets;
break;
}
/* allocate the private part of the URB */
urb_priv = kzalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
mem_flags);
if (!urb_priv)
return -ENOMEM;
INIT_LIST_HEAD (&urb_priv->pending);
urb_priv->length = size;
urb_priv->ed = ed;
/* allocate the TDs (deferring hash chain updates) */
for (i = 0; i < size; i++) {
urb_priv->td [i] = td_alloc (ohci, mem_flags);
if (!urb_priv->td [i]) {
urb_priv->length = i;
urb_free_priv (ohci, urb_priv);
return -ENOMEM;
}
}
spin_lock_irqsave (&ohci->lock, flags);
/* don't submit to a dead HC */
if (!HCD_HW_ACCESSIBLE(hcd)) {
retval = -ENODEV;
goto fail;
}
if (ohci->rh_state != OHCI_RH_RUNNING) {
retval = -ENODEV;
goto fail;
}
retval = usb_hcd_link_urb_to_ep(hcd, urb);
if (retval)
goto fail;
/* schedule the ed if needed */
if (ed->state == ED_IDLE) {
retval = ed_schedule (ohci, ed);
if (retval < 0) {
usb_hcd_unlink_urb_from_ep(hcd, urb);
goto fail;
}
if (ed->type == PIPE_ISOCHRONOUS) {
u16 frame = ohci_frame_no(ohci);
/* delay a few frames before the first TD */
frame += max_t (u16, 8, ed->interval);
frame &= ~(ed->interval - 1);
frame |= ed->branch;
urb->start_frame = frame;
/* yes, only URB_ISO_ASAP is supported, and
* urb->start_frame is never used as input.
*/
}
} else if (ed->type == PIPE_ISOCHRONOUS)
urb->start_frame = ed->last_iso + ed->interval;
/* fill the TDs and link them to the ed; and
* enable that part of the schedule, if needed
* and update count of queued periodic urbs
*/
urb->hcpriv = urb_priv;
td_submit_urb (ohci, urb);
fail:
if (retval)
urb_free_priv (ohci, urb_priv);
spin_unlock_irqrestore (&ohci->lock, flags);
return retval;
}
/*
* decouple the URB from the HC queues (TDs, urb_priv).
* reporting is always done
* asynchronously, and we might be dealing with an urb that's
* partially transferred, or an ED with other urbs being unlinked.
*/
static int ohci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
unsigned long flags;
int rc;
#ifdef OHCI_VERBOSE_DEBUG
urb_print(urb, "UNLINK", 1, status);
#endif
spin_lock_irqsave (&ohci->lock, flags);
rc = usb_hcd_check_unlink_urb(hcd, urb, status);
if (rc) {
; /* Do nothing */
} else if (ohci->rh_state == OHCI_RH_RUNNING) {
urb_priv_t *urb_priv;
/* Unless an IRQ completed the unlink while it was being
* handed to us, flag it for unlink and giveback, and force
* some upcoming INTR_SF to call finish_unlinks()
*/
urb_priv = urb->hcpriv;
if (urb_priv) {
if (urb_priv->ed->state == ED_OPER)
start_ed_unlink (ohci, urb_priv->ed);
}
} else {
/*
* with HC dead, we won't respect hc queue pointers
* any more ... just clean up every urb's memory.
*/
if (urb->hcpriv)
finish_urb(ohci, urb, status);
}
spin_unlock_irqrestore (&ohci->lock, flags);
return rc;
}
/*-------------------------------------------------------------------------*/
/* frees config/altsetting state for endpoints,
* including ED memory, dummy TD, and bulk/intr data toggle
*/
static void
ohci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
unsigned long flags;
struct ed *ed = ep->hcpriv;
unsigned limit = 1000;
/* ASSERT: any requests/urbs are being unlinked */
/* ASSERT: nobody can be submitting urbs for this any more */
if (!ed)
return;
rescan:
spin_lock_irqsave (&ohci->lock, flags);
if (ohci->rh_state != OHCI_RH_RUNNING) {
sanitize:
ed->state = ED_IDLE;
if (quirk_zfmicro(ohci) && ed->type == PIPE_INTERRUPT)
ohci->eds_scheduled--;
finish_unlinks (ohci, 0);
}
switch (ed->state) {
case ED_UNLINK: /* wait for hw to finish? */
/* major IRQ delivery trouble loses INTR_SF too... */
if (limit-- == 0) {
ohci_warn(ohci, "ED unlink timeout\n");
if (quirk_zfmicro(ohci)) {
ohci_warn(ohci, "Attempting ZF TD recovery\n");
ohci->ed_to_check = ed;
ohci->zf_delay = 2;
}
goto sanitize;
}
spin_unlock_irqrestore (&ohci->lock, flags);
schedule_timeout_uninterruptible(1);
goto rescan;
case ED_IDLE: /* fully unlinked */
if (list_empty (&ed->td_list)) {
td_free (ohci, ed->dummy);
ed_free (ohci, ed);
break;
}
/* else FALL THROUGH */
default:
/* caller was supposed to have unlinked any requests;
* that's not our job. can't recover; must leak ed.
*/
ohci_err (ohci, "leak ed %p (#%02x) state %d%s\n",
ed, ep->desc.bEndpointAddress, ed->state,
list_empty (&ed->td_list) ? "" : " (has tds)");
td_free (ohci, ed->dummy);
break;
}
ep->hcpriv = NULL;
spin_unlock_irqrestore (&ohci->lock, flags);
}
static int ohci_get_frame (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
return ohci_frame_no(ohci);
}
static void ohci_usb_reset (struct ohci_hcd *ohci)
{
ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
ohci->hc_control &= OHCI_CTRL_RWC;
ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
ohci->rh_state = OHCI_RH_HALTED;
}
/* ohci_shutdown forcibly disables IRQs and DMA, helping kexec and
* other cases where the next software may expect clean state from the
* "firmware". this is bus-neutral, unlike shutdown() methods.
*/
static void
ohci_shutdown (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci;
ohci = hcd_to_ohci (hcd);
ohci_writel(ohci, (u32) ~0, &ohci->regs->intrdisable);
/* Software reset, after which the controller goes into SUSPEND */
ohci_writel(ohci, OHCI_HCR, &ohci->regs->cmdstatus);
ohci_readl(ohci, &ohci->regs->cmdstatus); /* flush the writes */
udelay(10);
ohci_writel(ohci, ohci->fminterval, &ohci->regs->fminterval);
}
static int check_ed(struct ohci_hcd *ohci, struct ed *ed)
{
return (hc32_to_cpu(ohci, ed->hwINFO) & ED_IN) != 0
&& (hc32_to_cpu(ohci, ed->hwHeadP) & TD_MASK)
== (hc32_to_cpu(ohci, ed->hwTailP) & TD_MASK)
&& !list_empty(&ed->td_list);
}
/* ZF Micro watchdog timer callback. The ZF Micro chipset sometimes completes
* an interrupt TD but neglects to add it to the donelist. On systems with
* this chipset, we need to periodically check the state of the queues to look
* for such "lost" TDs.
*/
static void unlink_watchdog_func(unsigned long _ohci)
{
unsigned long flags;
unsigned max;
unsigned seen_count = 0;
unsigned i;
struct ed **seen = NULL;
struct ohci_hcd *ohci = (struct ohci_hcd *) _ohci;
spin_lock_irqsave(&ohci->lock, flags);
max = ohci->eds_scheduled;
if (!max)
goto done;
if (ohci->ed_to_check)
goto out;
seen = kcalloc(max, sizeof *seen, GFP_ATOMIC);
if (!seen)
goto out;
for (i = 0; i < NUM_INTS; i++) {
struct ed *ed = ohci->periodic[i];
while (ed) {
unsigned temp;
/* scan this branch of the periodic schedule tree */
for (temp = 0; temp < seen_count; temp++) {
if (seen[temp] == ed) {
/* we've checked it and what's after */
ed = NULL;
break;
}
}
if (!ed)
break;
seen[seen_count++] = ed;
if (!check_ed(ohci, ed)) {
ed = ed->ed_next;
continue;
}
/* HC's TD list is empty, but HCD sees at least one
* TD that's not been sent through the donelist.
*/
ohci->ed_to_check = ed;
ohci->zf_delay = 2;
/* The HC may wait until the next frame to report the
* TD as done through the donelist and INTR_WDH. (We
* just *assume* it's not a multi-TD interrupt URB;
* those could defer the IRQ more than one frame, using
* DI...) Check again after the next INTR_SF.
*/
ohci_writel(ohci, OHCI_INTR_SF,
&ohci->regs->intrstatus);
ohci_writel(ohci, OHCI_INTR_SF,
&ohci->regs->intrenable);
/* flush those writes */
(void) ohci_readl(ohci, &ohci->regs->control);
goto out;
}
}
out:
kfree(seen);
if (ohci->eds_scheduled)
mod_timer(&ohci->unlink_watchdog, round_jiffies(jiffies + HZ));
done:
spin_unlock_irqrestore(&ohci->lock, flags);
}
/*-------------------------------------------------------------------------*
* HC functions
*-------------------------------------------------------------------------*/
/* init memory, and kick BIOS/SMM off */
static int ohci_init (struct ohci_hcd *ohci)
{
int ret;
struct usb_hcd *hcd = ohci_to_hcd(ohci);
if (distrust_firmware)
ohci->flags |= OHCI_QUIRK_HUB_POWER;
ohci->rh_state = OHCI_RH_HALTED;
ohci->regs = hcd->regs;
/* REVISIT this BIOS handshake is now moved into PCI "quirks", and
* was never needed for most non-PCI systems ... remove the code?
*/
#ifndef IR_DISABLE
/* SMM owns the HC? not for long! */
if (!no_handshake && ohci_readl (ohci,
&ohci->regs->control) & OHCI_CTRL_IR) {
u32 temp;
ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
/* this timeout is arbitrary. we make it long, so systems
* depending on usb keyboards may be usable even if the
* BIOS/SMM code seems pretty broken.
*/
temp = 500; /* arbitrary: five seconds */
ohci_writel (ohci, OHCI_INTR_OC, &ohci->regs->intrenable);
ohci_writel (ohci, OHCI_OCR, &ohci->regs->cmdstatus);
while (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_IR) {
msleep (10);
if (--temp == 0) {
ohci_err (ohci, "USB HC takeover failed!"
" (BIOS/SMM bug)\n");
return -EBUSY;
}
}
ohci_usb_reset (ohci);
}
#endif
/* Disable HC interrupts */
ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
/* flush the writes, and save key bits like RWC */
if (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_RWC)
ohci->hc_control |= OHCI_CTRL_RWC;
/* Read the number of ports unless overridden */
if (ohci->num_ports == 0)
ohci->num_ports = roothub_a(ohci) & RH_A_NDP;
if (ohci->hcca)
return 0;
ohci->hcca = dma_alloc_coherent (hcd->self.controller,
sizeof *ohci->hcca, &ohci->hcca_dma, 0);
if (!ohci->hcca)
return -ENOMEM;
if ((ret = ohci_mem_init (ohci)) < 0)
ohci_stop (hcd);
else {
create_debug_files (ohci);
}
return ret;
}
/*-------------------------------------------------------------------------*/
/* Start an OHCI controller, set the BUS operational
* resets USB and controller
* enable interrupts
*/
static int ohci_run (struct ohci_hcd *ohci)
{
u32 mask, val;
int first = ohci->fminterval == 0;
struct usb_hcd *hcd = ohci_to_hcd(ohci);
ohci->rh_state = OHCI_RH_HALTED;
/* boot firmware should have set this up (5.1.1.3.1) */
if (first) {
val = ohci_readl (ohci, &ohci->regs->fminterval);
ohci->fminterval = val & 0x3fff;
if (ohci->fminterval != FI)
ohci_dbg (ohci, "fminterval delta %d\n",
ohci->fminterval - FI);
ohci->fminterval |= FSMP (ohci->fminterval) << 16;
/* also: power/overcurrent flags in roothub.a */
}
/* Reset USB nearly "by the book". RemoteWakeupConnected has
* to be checked in case boot firmware (BIOS/SMM/...) has set up
* wakeup in a way the bus isn't aware of (e.g., legacy PCI PM).
* If the bus glue detected wakeup capability then it should
* already be enabled; if so we'll just enable it again.
*/
if ((ohci->hc_control & OHCI_CTRL_RWC) != 0)
device_set_wakeup_capable(hcd->self.controller, 1);
switch (ohci->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_OPER:
val = 0;
break;
case OHCI_USB_SUSPEND:
case OHCI_USB_RESUME:
ohci->hc_control &= OHCI_CTRL_RWC;
ohci->hc_control |= OHCI_USB_RESUME;
val = 10 /* msec wait */;
break;
// case OHCI_USB_RESET:
default:
ohci->hc_control &= OHCI_CTRL_RWC;
ohci->hc_control |= OHCI_USB_RESET;
val = 50 /* msec wait */;
break;
}
ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
// flush the writes
(void) ohci_readl (ohci, &ohci->regs->control);
msleep(val);
memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
/* 2msec timelimit here means no irqs/preempt */
spin_lock_irq (&ohci->lock);
retry:
/* HC Reset requires max 10 us delay */
ohci_writel (ohci, OHCI_HCR, &ohci->regs->cmdstatus);
val = 30; /* ... allow extra time */
while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
if (--val == 0) {
spin_unlock_irq (&ohci->lock);
ohci_err (ohci, "USB HC reset timed out!\n");
return -1;
}
udelay (1);
}
/* now we're in the SUSPEND state ... must go OPERATIONAL
* within 2msec else HC enters RESUME
*
* ... but some hardware won't init fmInterval "by the book"
* (SiS, OPTi ...), so reset again instead. SiS doesn't need
* this if we write fmInterval after we're OPERATIONAL.
* Unclear about ALi, ServerWorks, and others ... this could
* easily be a longstanding bug in chip init on Linux.
*/
if (ohci->flags & OHCI_QUIRK_INITRESET) {
ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
// flush those writes
(void) ohci_readl (ohci, &ohci->regs->control);
}
/* Tell the controller where the control and bulk lists are
* The lists are empty now. */
ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
/* a reset clears this */
ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
periodic_reinit (ohci);
/* some OHCI implementations are finicky about how they init.
* bogus values here mean not even enumeration could work.
*/
if ((ohci_readl (ohci, &ohci->regs->fminterval) & 0x3fff0000) == 0
|| !ohci_readl (ohci, &ohci->regs->periodicstart)) {
if (!(ohci->flags & OHCI_QUIRK_INITRESET)) {
ohci->flags |= OHCI_QUIRK_INITRESET;
ohci_dbg (ohci, "enabling initreset quirk\n");
goto retry;
}
spin_unlock_irq (&ohci->lock);
ohci_err (ohci, "init err (%08x %04x)\n",
ohci_readl (ohci, &ohci->regs->fminterval),
ohci_readl (ohci, &ohci->regs->periodicstart));
return -EOVERFLOW;
}
/* use rhsc irqs after khubd is fully initialized */
set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
hcd->uses_new_polling = 1;
/* start controller operations */
ohci->hc_control &= OHCI_CTRL_RWC;
ohci->hc_control |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
ohci->rh_state = OHCI_RH_RUNNING;
/* wake on ConnectStatusChange, matching external hubs */
ohci_writel (ohci, RH_HS_DRWE, &ohci->regs->roothub.status);
/* Choose the interrupts we care about now, others later on demand */
mask = OHCI_INTR_INIT;
ohci_writel (ohci, ~0, &ohci->regs->intrstatus);
ohci_writel (ohci, mask, &ohci->regs->intrenable);
/* handle root hub init quirks ... */
val = roothub_a (ohci);
val &= ~(RH_A_PSM | RH_A_OCPM);
if (ohci->flags & OHCI_QUIRK_SUPERIO) {
/* NSC 87560 and maybe others */
val |= RH_A_NOCP;
val &= ~(RH_A_POTPGT | RH_A_NPS);
ohci_writel (ohci, val, &ohci->regs->roothub.a);
} else if ((ohci->flags & OHCI_QUIRK_AMD756) ||
(ohci->flags & OHCI_QUIRK_HUB_POWER)) {
/* hub power always on; required for AMD-756 and some
* Mac platforms. ganged overcurrent reporting, if any.
*/
val |= RH_A_NPS;
ohci_writel (ohci, val, &ohci->regs->roothub.a);
}
ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
ohci_writel (ohci, (val & RH_A_NPS) ? 0 : RH_B_PPCM,
&ohci->regs->roothub.b);
// flush those writes
(void) ohci_readl (ohci, &ohci->regs->control);
ohci->next_statechange = jiffies + STATECHANGE_DELAY;
spin_unlock_irq (&ohci->lock);
// POTPGT delay is bits 24-31, in 2 ms units.
mdelay ((val >> 23) & 0x1fe);
if (quirk_zfmicro(ohci)) {
/* Create timer to watch for bad queue state on ZF Micro */
setup_timer(&ohci->unlink_watchdog, unlink_watchdog_func,
(unsigned long) ohci);
ohci->eds_scheduled = 0;
ohci->ed_to_check = NULL;
}
ohci_dump (ohci, 1);
return 0;
}
/*-------------------------------------------------------------------------*/
/* an interrupt happens */
static irqreturn_t ohci_irq (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
struct ohci_regs __iomem *regs = ohci->regs;
int ints;
/* Read interrupt status (and flush pending writes). We ignore the
* optimization of checking the LSB of hcca->done_head; it doesn't
* work on all systems (edge triggering for OHCI can be a factor).
*/
ints = ohci_readl(ohci, &regs->intrstatus);
/* Check for an all 1's result which is a typical consequence
* of dead, unclocked, or unplugged (CardBus...) devices
*/
if (ints == ~(u32)0) {
ohci->rh_state = OHCI_RH_HALTED;
ohci_dbg (ohci, "device removed!\n");
usb_hc_died(hcd);
return IRQ_HANDLED;
}
/* We only care about interrupts that are enabled */
ints &= ohci_readl(ohci, &regs->intrenable);
/* interrupt for some other device? */
if (ints == 0 || unlikely(ohci->rh_state == OHCI_RH_HALTED))
return IRQ_NOTMINE;
if (ints & OHCI_INTR_UE) {
// e.g. due to PCI Master/Target Abort
if (quirk_nec(ohci)) {
/* Workaround for a silicon bug in some NEC chips used
* in Apple's PowerBooks. Adapted from Darwin code.
*/
ohci_err (ohci, "OHCI Unrecoverable Error, scheduling NEC chip restart\n");
ohci_writel (ohci, OHCI_INTR_UE, &regs->intrdisable);
schedule_work (&ohci->nec_work);
} else {
ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
ohci->rh_state = OHCI_RH_HALTED;
usb_hc_died(hcd);
}
ohci_dump (ohci, 1);
ohci_usb_reset (ohci);
}
if (ints & OHCI_INTR_RHSC) {
ohci_vdbg(ohci, "rhsc\n");
ohci->next_statechange = jiffies + STATECHANGE_DELAY;
ohci_writel(ohci, OHCI_INTR_RD | OHCI_INTR_RHSC,
&regs->intrstatus);
/* NOTE: Vendors didn't always make the same implementation
* choices for RHSC. Many followed the spec; RHSC triggers
* on an edge, like setting and maybe clearing a port status
* change bit. With others it's level-triggered, active
* until khubd clears all the port status change bits. We'll
* always disable it here and rely on polling until khubd
* re-enables it.
*/
ohci_writel(ohci, OHCI_INTR_RHSC, &regs->intrdisable);
usb_hcd_poll_rh_status(hcd);
}
/* For connect and disconnect events, we expect the controller
* to turn on RHSC along with RD. But for remote wakeup events
* this might not happen.
*/
else if (ints & OHCI_INTR_RD) {
ohci_vdbg(ohci, "resume detect\n");
ohci_writel(ohci, OHCI_INTR_RD, &regs->intrstatus);
set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
if (ohci->autostop) {
spin_lock (&ohci->lock);
ohci_rh_resume (ohci);
spin_unlock (&ohci->lock);
} else
usb_hcd_resume_root_hub(hcd);
}
if (ints & OHCI_INTR_WDH) {
spin_lock (&ohci->lock);
dl_done_list (ohci);
spin_unlock (&ohci->lock);
}
if (quirk_zfmicro(ohci) && (ints & OHCI_INTR_SF)) {
spin_lock(&ohci->lock);
if (ohci->ed_to_check) {
struct ed *ed = ohci->ed_to_check;
if (check_ed(ohci, ed)) {
/* HC thinks the TD list is empty; HCD knows
* at least one TD is outstanding
*/
if (--ohci->zf_delay == 0) {
struct td *td = list_entry(
ed->td_list.next,
struct td, td_list);
ohci_warn(ohci,
"Reclaiming orphan TD %p\n",
td);
takeback_td(ohci, td);
ohci->ed_to_check = NULL;
}
} else
ohci->ed_to_check = NULL;
}
spin_unlock(&ohci->lock);
}
/* could track INTR_SO to reduce available PCI/... bandwidth */
/* handle any pending URB/ED unlinks, leaving INTR_SF enabled
* when there's still unlinking to be done (next frame).
*/
spin_lock (&ohci->lock);
if (ohci->ed_rm_list)
finish_unlinks (ohci, ohci_frame_no(ohci));
if ((ints & OHCI_INTR_SF) != 0
&& !ohci->ed_rm_list
&& !ohci->ed_to_check
&& ohci->rh_state == OHCI_RH_RUNNING)
ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
spin_unlock (&ohci->lock);
if (ohci->rh_state == OHCI_RH_RUNNING) {
ohci_writel (ohci, ints, &regs->intrstatus);
ohci_writel (ohci, OHCI_INTR_MIE, &regs->intrenable);
// flush those writes
(void) ohci_readl (ohci, &ohci->regs->control);
}
return IRQ_HANDLED;
}
/*-------------------------------------------------------------------------*/
static void ohci_stop (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
ohci_dump (ohci, 1);
if (quirk_nec(ohci))
flush_work(&ohci->nec_work);
ohci_usb_reset (ohci);
ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
free_irq(hcd->irq, hcd);
hcd->irq = 0;
if (quirk_zfmicro(ohci))
del_timer(&ohci->unlink_watchdog);
if (quirk_amdiso(ohci))
usb_amd_dev_put();
remove_debug_files (ohci);
ohci_mem_cleanup (ohci);
if (ohci->hcca) {
dma_free_coherent (hcd->self.controller,
sizeof *ohci->hcca,
ohci->hcca, ohci->hcca_dma);
ohci->hcca = NULL;
ohci->hcca_dma = 0;
}
}
/*-------------------------------------------------------------------------*/
#if defined(CONFIG_PM) || defined(CONFIG_PCI)
/* must not be called from interrupt context */
static int ohci_restart (struct ohci_hcd *ohci)
{
int temp;
int i;
struct urb_priv *priv;
spin_lock_irq(&ohci->lock);
ohci->rh_state = OHCI_RH_HALTED;
/* Recycle any "live" eds/tds (and urbs). */
if (!list_empty (&ohci->pending))
ohci_dbg(ohci, "abort schedule...\n");
list_for_each_entry (priv, &ohci->pending, pending) {
struct urb *urb = priv->td[0]->urb;
struct ed *ed = priv->ed;
switch (ed->state) {
case ED_OPER:
ed->state = ED_UNLINK;
ed->hwINFO |= cpu_to_hc32(ohci, ED_DEQUEUE);
ed_deschedule (ohci, ed);
ed->ed_next = ohci->ed_rm_list;
ed->ed_prev = NULL;
ohci->ed_rm_list = ed;
/* FALLTHROUGH */
case ED_UNLINK:
break;
default:
ohci_dbg(ohci, "bogus ed %p state %d\n",
ed, ed->state);
}
if (!urb->unlinked)
urb->unlinked = -ESHUTDOWN;
}
finish_unlinks (ohci, 0);
spin_unlock_irq(&ohci->lock);
/* paranoia, in case that didn't work: */
/* empty the interrupt branches */
for (i = 0; i < NUM_INTS; i++) ohci->load [i] = 0;
for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table [i] = 0;
/* no EDs to remove */
ohci->ed_rm_list = NULL;
/* empty control and bulk lists */
ohci->ed_controltail = NULL;
ohci->ed_bulktail = NULL;
if ((temp = ohci_run (ohci)) < 0) {
ohci_err (ohci, "can't restart, %d\n", temp);
return temp;
}
ohci_dbg(ohci, "restart complete\n");
return 0;
}
#endif
/*-------------------------------------------------------------------------*/
MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE ("GPL");
#ifdef CONFIG_PCI
#include "ohci-pci.c"
#define PCI_DRIVER ohci_pci_driver
#endif
#if defined(CONFIG_ARCH_SA1100) && defined(CONFIG_SA1111)
#include "ohci-sa1111.c"
#define SA1111_DRIVER ohci_hcd_sa1111_driver
#endif
#if defined(CONFIG_ARCH_S3C24XX) || defined(CONFIG_ARCH_S3C64XX)
#include "ohci-s3c2410.c"
#define PLATFORM_DRIVER ohci_hcd_s3c2410_driver
#endif
#ifdef CONFIG_USB_OHCI_EXYNOS
#include "ohci-exynos.c"
#define PLATFORM_DRIVER exynos_ohci_driver
#endif
#ifdef CONFIG_USB_OHCI_HCD_OMAP1
#include "ohci-omap.c"
#define OMAP1_PLATFORM_DRIVER ohci_hcd_omap_driver
#endif
#ifdef CONFIG_USB_OHCI_HCD_OMAP3
#include "ohci-omap3.c"
#define OMAP3_PLATFORM_DRIVER ohci_hcd_omap3_driver
#endif
#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
#include "ohci-pxa27x.c"
#define PLATFORM_DRIVER ohci_hcd_pxa27x_driver
#endif
#ifdef CONFIG_ARCH_EP93XX
#include "ohci-ep93xx.c"
#define PLATFORM_DRIVER ohci_hcd_ep93xx_driver
#endif
#ifdef CONFIG_MIPS_ALCHEMY
#include "ohci-au1xxx.c"
#define PLATFORM_DRIVER ohci_hcd_au1xxx_driver
#endif
#ifdef CONFIG_PNX8550
#include "ohci-pnx8550.c"
#define PLATFORM_DRIVER ohci_hcd_pnx8550_driver
#endif
#ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
#include "ohci-ppc-soc.c"
#define PLATFORM_DRIVER ohci_hcd_ppc_soc_driver
#endif
#ifdef CONFIG_ARCH_AT91
#include "ohci-at91.c"
#define PLATFORM_DRIVER ohci_hcd_at91_driver
#endif
#ifdef CONFIG_ARCH_LPC32XX
#include "ohci-nxp.c"
#define PLATFORM_DRIVER usb_hcd_nxp_driver
#endif
#ifdef CONFIG_ARCH_DAVINCI_DA8XX
#include "ohci-da8xx.c"
#define PLATFORM_DRIVER ohci_hcd_da8xx_driver
#endif
#ifdef CONFIG_USB_OHCI_SH
#include "ohci-sh.c"
#define PLATFORM_DRIVER ohci_hcd_sh_driver
#endif
#ifdef CONFIG_USB_OHCI_HCD_PPC_OF
#include "ohci-ppc-of.c"
#define OF_PLATFORM_DRIVER ohci_hcd_ppc_of_driver
#endif
#ifdef CONFIG_PLAT_SPEAR
#include "ohci-spear.c"
#define PLATFORM_DRIVER spear_ohci_hcd_driver
#endif
#ifdef CONFIG_PPC_PS3
#include "ohci-ps3.c"
#define PS3_SYSTEM_BUS_DRIVER ps3_ohci_driver
#endif
#ifdef CONFIG_MFD_SM501
#include "ohci-sm501.c"
#define SM501_OHCI_DRIVER ohci_hcd_sm501_driver
#endif
#ifdef CONFIG_MFD_TC6393XB
#include "ohci-tmio.c"
#define TMIO_OHCI_DRIVER ohci_hcd_tmio_driver
#endif
#ifdef CONFIG_MACH_JZ4740
#include "ohci-jz4740.c"
#define PLATFORM_DRIVER ohci_hcd_jz4740_driver
#endif
#ifdef CONFIG_USB_OCTEON_OHCI
#include "ohci-octeon.c"
#define PLATFORM_DRIVER ohci_octeon_driver
#endif
#ifdef CONFIG_TILE_USB
#include "ohci-tilegx.c"
#define PLATFORM_DRIVER ohci_hcd_tilegx_driver
#endif
#ifdef CONFIG_USB_CNS3XXX_OHCI
#include "ohci-cns3xxx.c"
#define PLATFORM_DRIVER ohci_hcd_cns3xxx_driver
#endif
#ifdef CONFIG_CPU_XLR
#include "ohci-xls.c"
#define PLATFORM_DRIVER ohci_xls_driver
#endif
#ifdef CONFIG_USB_OHCI_HCD_PLATFORM
#include "ohci-platform.c"
#define PLATFORM_DRIVER ohci_platform_driver
#endif
#if !defined(PCI_DRIVER) && \
!defined(PLATFORM_DRIVER) && \
!defined(OMAP1_PLATFORM_DRIVER) && \
!defined(OMAP3_PLATFORM_DRIVER) && \
!defined(OF_PLATFORM_DRIVER) && \
!defined(SA1111_DRIVER) && \
!defined(PS3_SYSTEM_BUS_DRIVER) && \
!defined(SM501_OHCI_DRIVER) && \
!defined(TMIO_OHCI_DRIVER)
#error "missing bus glue for ohci-hcd"
#endif
static int __init ohci_hcd_mod_init(void)
{
int retval = 0;
if (usb_disabled())
return -ENODEV;
printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
sizeof (struct ed), sizeof (struct td));
set_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
#ifdef DEBUG
ohci_debug_root = debugfs_create_dir("ohci", usb_debug_root);
if (!ohci_debug_root) {
retval = -ENOENT;
goto error_debug;
}
#endif
#ifdef PS3_SYSTEM_BUS_DRIVER
retval = ps3_ohci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
if (retval < 0)
goto error_ps3;
#endif
#ifdef PLATFORM_DRIVER
retval = platform_driver_register(&PLATFORM_DRIVER);
if (retval < 0)
goto error_platform;
#endif
#ifdef OMAP1_PLATFORM_DRIVER
retval = platform_driver_register(&OMAP1_PLATFORM_DRIVER);
if (retval < 0)
goto error_omap1_platform;
#endif
#ifdef OMAP3_PLATFORM_DRIVER
retval = platform_driver_register(&OMAP3_PLATFORM_DRIVER);
if (retval < 0)
goto error_omap3_platform;
#endif
#ifdef OF_PLATFORM_DRIVER
retval = platform_driver_register(&OF_PLATFORM_DRIVER);
if (retval < 0)
goto error_of_platform;
#endif
#ifdef SA1111_DRIVER
retval = sa1111_driver_register(&SA1111_DRIVER);
if (retval < 0)
goto error_sa1111;
#endif
#ifdef PCI_DRIVER
retval = pci_register_driver(&PCI_DRIVER);
if (retval < 0)
goto error_pci;
#endif
#ifdef SM501_OHCI_DRIVER
retval = platform_driver_register(&SM501_OHCI_DRIVER);
if (retval < 0)
goto error_sm501;
#endif
#ifdef TMIO_OHCI_DRIVER
retval = platform_driver_register(&TMIO_OHCI_DRIVER);
if (retval < 0)
goto error_tmio;
#endif
return retval;
/* Error path */
#ifdef TMIO_OHCI_DRIVER
platform_driver_unregister(&TMIO_OHCI_DRIVER);
error_tmio:
#endif
#ifdef SM501_OHCI_DRIVER
platform_driver_unregister(&SM501_OHCI_DRIVER);
error_sm501:
#endif
#ifdef PCI_DRIVER
pci_unregister_driver(&PCI_DRIVER);
error_pci:
#endif
#ifdef SA1111_DRIVER
sa1111_driver_unregister(&SA1111_DRIVER);
error_sa1111:
#endif
#ifdef OF_PLATFORM_DRIVER
platform_driver_unregister(&OF_PLATFORM_DRIVER);
error_of_platform:
#endif
#ifdef PLATFORM_DRIVER
platform_driver_unregister(&PLATFORM_DRIVER);
error_platform:
#endif
#ifdef OMAP1_PLATFORM_DRIVER
platform_driver_unregister(&OMAP1_PLATFORM_DRIVER);
error_omap1_platform:
#endif
#ifdef OMAP3_PLATFORM_DRIVER
platform_driver_unregister(&OMAP3_PLATFORM_DRIVER);
error_omap3_platform:
#endif
#ifdef PS3_SYSTEM_BUS_DRIVER
ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
error_ps3:
#endif
#ifdef DEBUG
debugfs_remove(ohci_debug_root);
ohci_debug_root = NULL;
error_debug:
#endif
clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
return retval;
}
module_init(ohci_hcd_mod_init);
static void __exit ohci_hcd_mod_exit(void)
{
#ifdef TMIO_OHCI_DRIVER
platform_driver_unregister(&TMIO_OHCI_DRIVER);
#endif
#ifdef SM501_OHCI_DRIVER
platform_driver_unregister(&SM501_OHCI_DRIVER);
#endif
#ifdef PCI_DRIVER
pci_unregister_driver(&PCI_DRIVER);
#endif
#ifdef SA1111_DRIVER
sa1111_driver_unregister(&SA1111_DRIVER);
#endif
#ifdef OF_PLATFORM_DRIVER
platform_driver_unregister(&OF_PLATFORM_DRIVER);
#endif
#ifdef PLATFORM_DRIVER
platform_driver_unregister(&PLATFORM_DRIVER);
#endif
#ifdef OMAP3_PLATFORM_DRIVER
platform_driver_unregister(&OMAP3_PLATFORM_DRIVER);
#endif
#ifdef PS3_SYSTEM_BUS_DRIVER
ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
#endif
#ifdef DEBUG
debugfs_remove(ohci_debug_root);
#endif
clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
}
module_exit(ohci_hcd_mod_exit);
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