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linux/drivers/usb/host/ohci-hcd.c
Benjamin Herrenschmidt badef81922 usb: Remove OHCI useless masking/unmasking of WDH interrupt 
The OHCI driver's IRQ handler, while processing a WDH interrupt, masks
and unmasks it.  I believe this is both broken (the write may still be
posted during the donelist processing it's trying to safeguard) and
useless as this IRQ may not be reissued until it's acked (unless this
legacy code is an uncommented workaround for some chip erratum).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-02-01 14:34:53 -08:00

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/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (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/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/reboot.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include "../core/hcd.h"
#define DRIVER_VERSION "2006 August 04"
#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"
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
#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 int 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 int 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 upto 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 (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
retval = -ENODEV;
goto fail;
}
if (!HC_IS_RUNNING(hcd->state)) {
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 (HC_IS_RUNNING(hcd->state)) {
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 (!HC_IS_RUNNING (hcd->state)) {
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);
return;
}
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_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, OHCI_INTR_MIE, &ohci->regs->intrdisable);
ohci_usb_reset (ohci);
/* flush the writes */
(void) ohci_readl (ohci, &ohci->regs->control);
}
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_relative(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);
disable (ohci);
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, temp;
int first = ohci->fminterval == 0;
struct usb_hcd *hcd = ohci_to_hcd(ohci);
disable (ohci);
/* boot firmware should have set this up (5.1.1.3.1) */
if (first) {
temp = ohci_readl (ohci, &ohci->regs->fminterval);
ohci->fminterval = temp & 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 was
* saved if boot firmware (BIOS/SMM/...) told us it's connected,
* or if bus glue did the same (e.g. for PCI add-in cards with
* PCI PM support).
*/
if ((ohci->hc_control & OHCI_CTRL_RWC) != 0
&& !device_may_wakeup(hcd->self.controller))
device_init_wakeup(hcd->self.controller, 1);
switch (ohci->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_OPER:
temp = 0;
break;
case OHCI_USB_SUSPEND:
case OHCI_USB_RESUME:
ohci->hc_control &= OHCI_CTRL_RWC;
ohci->hc_control |= OHCI_USB_RESUME;
temp = 10 /* msec wait */;
break;
// case OHCI_USB_RESET:
default:
ohci->hc_control &= OHCI_CTRL_RWC;
ohci->hc_control |= OHCI_USB_RESET;
temp = 50 /* msec wait */;
break;
}
ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
// flush the writes
(void) ohci_readl (ohci, &ohci->regs->control);
msleep(temp);
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);
temp = 30; /* ... allow extra time */
while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
if (--temp == 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 */
hcd->poll_rh = 1;
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);
hcd->state = HC_STATE_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 ... */
temp = roothub_a (ohci);
temp &= ~(RH_A_PSM | RH_A_OCPM);
if (ohci->flags & OHCI_QUIRK_SUPERIO) {
/* NSC 87560 and maybe others */
temp |= RH_A_NOCP;
temp &= ~(RH_A_POTPGT | RH_A_NPS);
ohci_writel (ohci, temp, &ohci->regs->roothub.a);
} else if ((ohci->flags & OHCI_QUIRK_AMD756) || distrust_firmware) {
/* hub power always on; required for AMD-756 and some
* Mac platforms. ganged overcurrent reporting, if any.
*/
temp |= RH_A_NPS;
ohci_writel (ohci, temp, &ohci->regs->roothub.a);
}
ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
ohci_writel (ohci, (temp & 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 ((temp >> 23) & 0x1fe);
hcd->state = HC_STATE_RUNNING;
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) {
disable (ohci);
ohci_dbg (ohci, "device removed!\n");
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)
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 {
disable (ohci);
ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
}
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);
hcd->poll_rh = 1;
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
&& HC_IS_RUNNING(hcd->state))
ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
spin_unlock (&ohci->lock);
if (HC_IS_RUNNING(hcd->state)) {
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);
flush_scheduled_work();
ohci_usb_reset (ohci);
ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
free_irq(hcd->irq, hcd);
hcd->irq = -1;
if (quirk_zfmicro(ohci))
del_timer(&ohci->unlink_watchdog);
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);
disable (ohci);
/* 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
/*-------------------------------------------------------------------------*/
#define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION (DRIVER_INFO);
MODULE_LICENSE ("GPL");
#ifdef CONFIG_PCI
#include "ohci-pci.c"
#define PCI_DRIVER ohci_pci_driver
#endif
#ifdef CONFIG_SA1111
#include "ohci-sa1111.c"
#define SA1111_DRIVER ohci_hcd_sa1111_driver
#endif
#ifdef CONFIG_ARCH_S3C2410
#include "ohci-s3c2410.c"
#define PLATFORM_DRIVER ohci_hcd_s3c2410_driver
#endif
#ifdef CONFIG_ARCH_OMAP
#include "ohci-omap.c"
#define PLATFORM_DRIVER ohci_hcd_omap_driver
#endif
#ifdef CONFIG_ARCH_LH7A404
#include "ohci-lh7a404.c"
#define PLATFORM_DRIVER ohci_hcd_lh7a404_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_SOC_AU1X00
#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_PNX4008
#include "ohci-pnx4008.c"
#define PLATFORM_DRIVER usb_hcd_pnx4008_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_PPC_PS3
#include "ohci-ps3.c"
#define PS3_SYSTEM_BUS_DRIVER ps3_ohci_driver
#endif
#ifdef CONFIG_USB_OHCI_HCD_SSB
#include "ohci-ssb.c"
#define SSB_OHCI_DRIVER ssb_ohci_driver
#endif
#if !defined(PCI_DRIVER) && \
!defined(PLATFORM_DRIVER) && \
!defined(OF_PLATFORM_DRIVER) && \
!defined(SA1111_DRIVER) && \
!defined(PS3_SYSTEM_BUS_DRIVER) && \
!defined(SSB_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_DEBUG "%s: " DRIVER_INFO "\n", hcd_name);
pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
sizeof (struct ed), sizeof (struct td));
#ifdef DEBUG
ohci_debug_root = debugfs_create_dir("ohci", NULL);
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 OF_PLATFORM_DRIVER
retval = of_register_platform_driver(&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 SSB_OHCI_DRIVER
retval = ssb_driver_register(&SSB_OHCI_DRIVER);
if (retval)
goto error_ssb;
#endif
return retval;
/* Error path */
#ifdef SSB_OHCI_DRIVER
error_ssb:
#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
of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
error_of_platform:
#endif
#ifdef PLATFORM_DRIVER
platform_driver_unregister(&PLATFORM_DRIVER);
error_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
return retval;
}
module_init(ohci_hcd_mod_init);
static void __exit ohci_hcd_mod_exit(void)
{
#ifdef SSB_OHCI_DRIVER
ssb_driver_unregister(&SSB_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
of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
#endif
#ifdef PLATFORM_DRIVER
platform_driver_unregister(&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
}
module_exit(ohci_hcd_mod_exit);
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