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linux/drivers/usb/host/ohci-hcd.c
David Brownell 839ab1d4ce [PATCH] USB: fix bug in ohci-hcd.c ohci_restart() 
A loop on a power-lost resume path used the wrong index.
I suspect khubd has been working around such bugs.
Noticed by Andreas Mohr <andi@rhlx01.fht-esslingen.de>.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-05-08 23:43:54 -07:00

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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.
*
* History:
*
* 2004/03/24 LH7A404 support (Durgesh Pattamatta & Marc Singer)
* 2004/02/04 use generic dma_* functions instead of pci_* (dsaxena@plexity.net)
* 2003/02/24 show registers in sysfs (Kevin Brosius)
*
* 2002/09/03 get rid of ed hashtables, rework periodic scheduling and
* bandwidth accounting; if debugging, show schedules in driverfs
* 2002/07/19 fixes to management of ED and schedule state.
* 2002/06/09 SA-1111 support (Christopher Hoover)
* 2002/06/01 remember frame when HC won't see EDs any more; use that info
* to fix urb unlink races caused by interrupt latency assumptions;
* minor ED field and function naming updates
* 2002/01/18 package as a patch for 2.5.3; this should match the
* 2.4.17 kernel modulo some bugs being fixed.
*
* 2001/10/18 merge pmac cleanup (Benjamin Herrenschmidt) and bugfixes
* from post-2.4.5 patches.
* 2001/09/20 URB_ZERO_PACKET support; hcca_dma portability, OPTi warning
* 2001/09/07 match PCI PM changes, errnos from Linus' tree
* 2001/05/05 fork 2.4.5 version into "hcd" framework, cleanup, simplify;
* pbook pci quirks gone (please fix pbook pci sw!) (db)
*
* 2001/04/08 Identify version on module load (gb)
* 2001/03/24 td/ed hashing to remove bus_to_virt (Steve Longerbeam);
pci_map_single (db)
* 2001/03/21 td and dev/ed allocation uses new pci_pool API (db)
* 2001/03/07 hcca allocation uses pci_alloc_consistent (Steve Longerbeam)
*
* 2000/09/26 fixed races in removing the private portion of the urb
* 2000/09/07 disable bulk and control lists when unlinking the last
* endpoint descriptor in order to avoid unrecoverable errors on
* the Lucent chips. (rwc@sgi)
* 2000/08/29 use bandwidth claiming hooks (thanks Randy!), fix some
* urb unlink probs, indentation fixes
* 2000/08/11 various oops fixes mostly affecting iso and cleanup from
* device unplugs.
* 2000/06/28 use PCI hotplug framework, for better power management
* and for Cardbus support (David Brownell)
* 2000/earlier: fixes for NEC/Lucent chips; suspend/resume handling
* when the controller loses power; handle UE; cleanup; ...
*
* v5.2 1999/12/07 URB 3rd preview,
* v5.1 1999/11/30 URB 2nd preview, cpia, (usb-scsi)
* v5.0 1999/11/22 URB Technical preview, Paul Mackerras powerbook susp/resume
* i386: HUB, Keyboard, Mouse, Printer
*
* v4.3 1999/10/27 multiple HCs, bulk_request
* v4.2 1999/09/05 ISO API alpha, new dev alloc, neg Error-codes
* v4.1 1999/08/27 Randy Dunlap's - ISO API first impl.
* v4.0 1999/08/18
* v3.0 1999/06/25
* v2.1 1999/05/09 code clean up
* v2.0 1999/05/04
* v1.0 1999/04/27 initial release
*
* This file is licenced under the GPL.
*/
#include <linux/config.h>
#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/smp_lock.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 <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 "2005 April 22"
#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_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";
#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);
static int ohci_reboot (struct notifier_block *, unsigned long , void *);
#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 usb_host_endpoint *ep,
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));
#endif
/* every endpoint has a ed, locate and maybe (re)initialize it */
if (! (ed = ed_get (ohci, 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 = kmalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
mem_flags);
if (!urb_priv)
return -ENOMEM;
memset (urb_priv, 0, sizeof (urb_priv_t) + size * sizeof (struct td *));
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;
}
/* in case of unlink-during-submit */
spin_lock (&urb->lock);
if (urb->status != -EINPROGRESS) {
spin_unlock (&urb->lock);
urb->hcpriv = urb_priv;
finish_urb (ohci, urb, NULL);
retval = 0;
goto fail;
}
/* schedule the ed if needed */
if (ed->state == ED_IDLE) {
retval = ed_schedule (ohci, ed);
if (retval < 0)
goto fail0;
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);
fail0:
spin_unlock (&urb->lock);
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); it's
* already marked using urb->status. 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)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
unsigned long flags;
#ifdef OHCI_VERBOSE_DEBUG
urb_print (urb, "UNLINK", 1);
#endif
spin_lock_irqsave (&ohci->lock, flags);
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, NULL);
}
spin_unlock_irqrestore (&ohci->lock, flags);
return 0;
}
/*-------------------------------------------------------------------------*/
/* 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;
finish_unlinks (ohci, 0, NULL);
}
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, "IRQ INTR_SF lossage\n");
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);
}
/* reboot notifier 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 int
ohci_reboot (struct notifier_block *block, unsigned long code, void *null)
{
struct ohci_hcd *ohci;
ohci = container_of (block, struct ohci_hcd, reboot_notifier);
ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
ohci_usb_reset (ohci);
/* flush the writes */
(void) ohci_readl (ohci, &ohci->regs->control);
return 0;
}
/*-------------------------------------------------------------------------*
* 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;
ohci->next_statechange = jiffies;
/* 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 {
register_reboot_notifier (&ohci->reboot_notifier);
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).
*/
ohci_dbg (ohci, "resetting from state '%s', control = 0x%x\n",
hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS),
ohci_readl (ohci, &ohci->regs->control));
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);
temp = roothub_a (ohci);
if (!(temp & RH_A_NPS)) {
/* power down each port */
for (temp = 0; temp < ohci->num_ports; temp++)
ohci_writel (ohci, RH_PS_LSDA,
&ohci->regs->roothub.portstatus [temp]);
}
// flush those writes
(void) ohci_readl (ohci, &ohci->regs->control);
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;
}
/* 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, mask, &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);
spin_unlock_irq (&ohci->lock);
// POTPGT delay is bits 24-31, in 2 ms units.
mdelay ((temp >> 23) & 0x1fe);
hcd->state = HC_STATE_RUNNING;
ohci_dump (ohci, 1);
return 0;
}
/*-------------------------------------------------------------------------*/
/* an interrupt happens */
static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
struct ohci_regs __iomem *regs = ohci->regs;
int ints;
/* we can eliminate a (slow) ohci_readl()
if _only_ WDH caused this irq */
if ((ohci->hcca->done_head != 0)
&& ! (hc32_to_cpup (ohci, &ohci->hcca->done_head)
& 0x01)) {
ints = OHCI_INTR_WDH;
/* cardbus/... hardware gone before remove() */
} else if ((ints = ohci_readl (ohci, &regs->intrstatus)) == ~(u32)0) {
disable (ohci);
ohci_dbg (ohci, "device removed!\n");
return IRQ_HANDLED;
/* interrupt for some other device? */
} else if ((ints &= ohci_readl (ohci, &regs->intrenable)) == 0) {
return IRQ_NOTMINE;
}
if (ints & OHCI_INTR_UE) {
disable (ohci);
ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
// e.g. due to PCI Master/Target Abort
ohci_dump (ohci, 1);
ohci_usb_reset (ohci);
}
if (ints & OHCI_INTR_RD) {
ohci_vdbg (ohci, "resume detect\n");
ohci_writel (ohci, OHCI_INTR_RD, &regs->intrstatus);
if (hcd->state != HC_STATE_QUIESCING)
usb_hcd_resume_root_hub(hcd);
}
if (ints & OHCI_INTR_WDH) {
if (HC_IS_RUNNING(hcd->state))
ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrdisable);
spin_lock (&ohci->lock);
dl_done_list (ohci, ptregs);
spin_unlock (&ohci->lock);
if (HC_IS_RUNNING(hcd->state))
ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrenable);
}
/* 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), ptregs);
if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
&& 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_dbg (ohci, "stop %s controller (state 0x%02x)\n",
hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS),
hcd->state);
ohci_dump (ohci, 1);
flush_scheduled_work();
ohci_usb_reset (ohci);
ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
remove_debug_files (ohci);
unregister_reboot_notifier (&ohci->reboot_notifier);
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;
}
}
/*-------------------------------------------------------------------------*/
/* must not be called from interrupt context */
#ifdef CONFIG_PM
static int ohci_restart (struct ohci_hcd *ohci)
{
int temp;
int i;
struct urb_priv *priv;
/* mark any devices gone, so they do nothing till khubd disconnects.
* recycle any "live" eds/tds (and urbs) right away.
* later, khubd disconnect processing will recycle the other state,
* (either as disconnect/reconnect, or maybe someday as a reset).
*/
spin_lock_irq(&ohci->lock);
disable (ohci);
usb_root_hub_lost_power(ohci_to_hcd(ohci)->self.root_hub);
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);
}
spin_lock (&urb->lock);
urb->status = -ESHUTDOWN;
spin_unlock (&urb->lock);
}
finish_unlinks (ohci, 0, NULL);
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;
} else {
/* here we "know" root ports should always stay powered,
* and that if we try to turn them back on the root hub
* will respond to CSC processing.
*/
i = ohci->num_ports;
while (i--)
ohci_writel (ohci, RH_PS_PSS,
&ohci->regs->roothub.portstatus [i]);
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"
#endif
#ifdef CONFIG_SA1111
#include "ohci-sa1111.c"
#endif
#ifdef CONFIG_ARCH_S3C2410
#include "ohci-s3c2410.c"
#endif
#ifdef CONFIG_ARCH_OMAP
#include "ohci-omap.c"
#endif
#ifdef CONFIG_ARCH_LH7A404
#include "ohci-lh7a404.c"
#endif
#ifdef CONFIG_PXA27x
#include "ohci-pxa27x.c"
#endif
#ifdef CONFIG_SOC_AU1X00
#include "ohci-au1xxx.c"
#endif
#ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
#include "ohci-ppc-soc.c"
#endif
#ifdef CONFIG_ARCH_AT91RM9200
#include "ohci-at91.c"
#endif
#if !(defined(CONFIG_PCI) \
|| defined(CONFIG_SA1111) \
|| defined(CONFIG_ARCH_S3C2410) \
|| defined(CONFIG_ARCH_OMAP) \
|| defined (CONFIG_ARCH_LH7A404) \
|| defined (CONFIG_PXA27x) \
|| defined (CONFIG_SOC_AU1X00) \
|| defined (CONFIG_USB_OHCI_HCD_PPC_SOC) \
|| defined (CONFIG_ARCH_AT91RM9200) \
)
#error "missing bus glue for ohci-hcd"
#endif
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