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linux-next/drivers/usb/host/ohci-hcd.c
Greg Kroah-Hartman 63c4c0d881 USB: ohci: no need to check return value of debugfs_create functions 
When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

There is also no need to keep the file dentries around at all, so remove
those variables from the host controller structure.

Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-05-31 12:54:21 +02:00

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// SPDX-License-Identifier: GPL-1.0+
/*
* 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"
/*-------------------------------------------------------------------------*/
/* 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)
#define IO_WATCHDOG_DELAY msecs_to_jiffies(275)
#define IO_WATCHDOG_OFF 0xffffff00
#include "ohci.h"
#include "pci-quirks.h"
static void ohci_dump(struct ohci_hcd *ohci);
static void ohci_stop(struct usb_hcd *hcd);
static void io_watchdog_func(struct timer_list *t);
#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 = true;
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;
module_param (no_handshake, bool, 0);
MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
/*-------------------------------------------------------------------------*/
static int number_of_tds(struct urb *urb)
{
int len, i, num, this_sg_len;
struct scatterlist *sg;
len = urb->transfer_buffer_length;
i = urb->num_mapped_sgs;
if (len > 0 && i > 0) { /* Scatter-gather transfer */
num = 0;
sg = urb->sg;
for (;;) {
this_sg_len = min_t(int, sg_dma_len(sg), len);
num += DIV_ROUND_UP(this_sg_len, 4096);
len -= this_sg_len;
if (--i <= 0 || len <= 0)
break;
sg = sg_next(sg);
}
} else { /* Non-SG transfer */
/* one TD for every 4096 Bytes (could be up to 8K) */
num = DIV_ROUND_UP(len, 4096);
}
return num;
}
/*
* 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;
/* every endpoint has a ed, locate and maybe (re)initialize it */
ed = ed_get(ohci, urb->ep, urb->dev, pipe, urb->interval);
if (! ed)
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:
size += number_of_tds(urb);
/* 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;
}
/* Start up the I/O watchdog timer, if it's not running */
if (ohci->prev_frame_no == IO_WATCHDOG_OFF &&
list_empty(&ohci->eds_in_use) &&
!(ohci->flags & OHCI_QUIRK_QEMU)) {
ohci->prev_frame_no = ohci_frame_no(ohci);
mod_timer(&ohci->io_watchdog,
jiffies + IO_WATCHDOG_DELAY);
}
list_add(&ed->in_use_list, &ohci->eds_in_use);
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;
ed->last_iso = frame + ed->interval * (size - 1);
}
} else if (ed->type == PIPE_ISOCHRONOUS) {
u16 next = ohci_frame_no(ohci) + 1;
u16 frame = ed->last_iso + ed->interval;
u16 length = ed->interval * (size - 1);
/* Behind the scheduling threshold? */
if (unlikely(tick_before(frame, next))) {
/* URB_ISO_ASAP: Round up to the first available slot */
if (urb->transfer_flags & URB_ISO_ASAP) {
frame += (next - frame + ed->interval - 1) &
-ed->interval;
/*
* Not ASAP: Use the next slot in the stream,
* no matter what.
*/
} else {
/*
* Some OHCI hardware doesn't handle late TDs
* correctly. After retiring them it proceeds
* to the next ED instead of the next TD.
* Therefore we have to omit the late TDs
* entirely.
*/
urb_priv->td_cnt = DIV_ROUND_UP(
(u16) (next - frame),
ed->interval);
if (urb_priv->td_cnt >= urb_priv->length) {
++urb_priv->td_cnt; /* Mark it */
ohci_dbg(ohci, "iso underrun %p (%u+%u < %u)\n",
urb, frame, length,
next);
}
}
}
urb->start_frame = frame;
ed->last_iso = frame + length;
}
/* 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;
urb_priv_t *urb_priv;
spin_lock_irqsave (&ohci->lock, flags);
rc = usb_hcd_check_unlink_urb(hcd, urb, status);
if (rc == 0) {
/* 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->ed->state == ED_OPER)
start_ed_unlink(ohci, urb_priv->ed);
if (ohci->rh_state != OHCI_RH_RUNNING) {
/* With HC dead, we can clean up right away */
ohci_work(ohci);
}
}
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;
ohci_work(ohci);
}
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");
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;
}
/* 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);
ohci->rh_state = OHCI_RH_HALTED;
}
/*-------------------------------------------------------------------------*
* 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);
/* Accept arbitrarily long scatter-gather lists */
if (!(hcd->driver->flags & HCD_LOCAL_MEM))
hcd->self.sg_tablesize = ~0;
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;
timer_setup(&ohci->io_watchdog, io_watchdog_func, 0);
ohci->prev_frame_no = IO_WATCHDOG_OFF;
ohci->hcca = dma_alloc_coherent (hcd->self.controller,
sizeof(*ohci->hcca), &ohci->hcca_dma, GFP_KERNEL);
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 hub_wq is allocated */
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);
ohci_dump(ohci);
return 0;
}
/* ohci_setup routine for generic controller initialization */
int ohci_setup(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
ohci_hcd_init(ohci);
return ohci_init(ohci);
}
EXPORT_SYMBOL_GPL(ohci_setup);
/* ohci_start routine for generic controller start of all OHCI bus glue */
static int ohci_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
ret = ohci_run(ohci);
if (ret < 0) {
ohci_err(ohci, "can't start\n");
ohci_stop(hcd);
}
return ret;
}
/*-------------------------------------------------------------------------*/
/*
* Some OHCI controllers are known to lose track of completed TDs. They
* don't add the TDs to the hardware done queue, which means we never see
* them as being completed.
*
* This watchdog routine checks for such problems. Without some way to
* tell when those TDs have completed, we would never take their EDs off
* the unlink list. As a result, URBs could never be dequeued and
* endpoints could never be released.
*/
static void io_watchdog_func(struct timer_list *t)
{
struct ohci_hcd *ohci = from_timer(ohci, t, io_watchdog);
bool takeback_all_pending = false;
u32 status;
u32 head;
struct ed *ed;
struct td *td, *td_start, *td_next;
unsigned frame_no, prev_frame_no = IO_WATCHDOG_OFF;
unsigned long flags;
spin_lock_irqsave(&ohci->lock, flags);
/*
* One way to lose track of completed TDs is if the controller
* never writes back the done queue head. If it hasn't been
* written back since the last time this function ran and if it
* was non-empty at that time, something is badly wrong with the
* hardware.
*/
status = ohci_readl(ohci, &ohci->regs->intrstatus);
if (!(status & OHCI_INTR_WDH) && ohci->wdh_cnt == ohci->prev_wdh_cnt) {
if (ohci->prev_donehead) {
ohci_err(ohci, "HcDoneHead not written back; disabled\n");
died:
usb_hc_died(ohci_to_hcd(ohci));
ohci_dump(ohci);
ohci_shutdown(ohci_to_hcd(ohci));
goto done;
} else {
/* No write back because the done queue was empty */
takeback_all_pending = true;
}
}
/* Check every ED which might have pending TDs */
list_for_each_entry(ed, &ohci->eds_in_use, in_use_list) {
if (ed->pending_td) {
if (takeback_all_pending ||
OKAY_TO_TAKEBACK(ohci, ed)) {
unsigned tmp = hc32_to_cpu(ohci, ed->hwINFO);
ohci_dbg(ohci, "takeback pending TD for dev %d ep 0x%x\n",
0x007f & tmp,
(0x000f & (tmp >> 7)) +
((tmp & ED_IN) >> 5));
add_to_done_list(ohci, ed->pending_td);
}
}
/* Starting from the latest pending TD, */
td = ed->pending_td;
/* or the last TD on the done list, */
if (!td) {
list_for_each_entry(td_next, &ed->td_list, td_list) {
if (!td_next->next_dl_td)
break;
td = td_next;
}
}
/* find the last TD processed by the controller. */
head = hc32_to_cpu(ohci, READ_ONCE(ed->hwHeadP)) & TD_MASK;
td_start = td;
td_next = list_prepare_entry(td, &ed->td_list, td_list);
list_for_each_entry_continue(td_next, &ed->td_list, td_list) {
if (head == (u32) td_next->td_dma)
break;
td = td_next; /* head pointer has passed this TD */
}
if (td != td_start) {
/*
* In case a WDH cycle is in progress, we will wait
* for the next two cycles to complete before assuming
* this TD will never get on the done queue.
*/
ed->takeback_wdh_cnt = ohci->wdh_cnt + 2;
ed->pending_td = td;
}
}
ohci_work(ohci);
if (ohci->rh_state == OHCI_RH_RUNNING) {
/*
* Sometimes a controller just stops working. We can tell
* by checking that the frame counter has advanced since
* the last time we ran.
*
* But be careful: Some controllers violate the spec by
* stopping their frame counter when no ports are active.
*/
frame_no = ohci_frame_no(ohci);
if (frame_no == ohci->prev_frame_no) {
int active_cnt = 0;
int i;
unsigned tmp;
for (i = 0; i < ohci->num_ports; ++i) {
tmp = roothub_portstatus(ohci, i);
/* Enabled and not suspended? */
if ((tmp & RH_PS_PES) && !(tmp & RH_PS_PSS))
++active_cnt;
}
if (active_cnt > 0) {
ohci_err(ohci, "frame counter not updating; disabled\n");
goto died;
}
}
if (!list_empty(&ohci->eds_in_use)) {
prev_frame_no = frame_no;
ohci->prev_wdh_cnt = ohci->wdh_cnt;
ohci->prev_donehead = ohci_readl(ohci,
&ohci->regs->donehead);
mod_timer(&ohci->io_watchdog,
jiffies + IO_WATCHDOG_DELAY);
}
}
done:
ohci->prev_frame_no = prev_frame_no;
spin_unlock_irqrestore(&ohci->lock, flags);
}
/* 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);
ohci_usb_reset (ohci);
}
if (ints & OHCI_INTR_RHSC) {
ohci_dbg(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 hub_wq clears all the port status change bits. We'll
* always disable it here and rely on polling until hub_wq
* 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_dbg(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);
}
spin_lock(&ohci->lock);
if (ints & OHCI_INTR_WDH)
update_done_list(ohci);
/* 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).
*/
ohci_work(ohci);
if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
&& ohci->rh_state == OHCI_RH_RUNNING)
ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
if (ohci->rh_state == OHCI_RH_RUNNING) {
ohci_writel (ohci, ints, &regs->intrstatus);
if (ints & OHCI_INTR_WDH)
++ohci->wdh_cnt;
ohci_writel (ohci, OHCI_INTR_MIE, &regs->intrenable);
// flush those writes
(void) ohci_readl (ohci, &ohci->regs->control);
}
spin_unlock(&ohci->lock);
return IRQ_HANDLED;
}
/*-------------------------------------------------------------------------*/
static void ohci_stop (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
ohci_dump(ohci);
if (quirk_nec(ohci))
flush_work(&ohci->nec_work);
del_timer_sync(&ohci->io_watchdog);
ohci->prev_frame_no = IO_WATCHDOG_OFF;
ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
ohci_usb_reset(ohci);
free_irq(hcd->irq, hcd);
hcd->irq = 0;
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_USB_PCI)
/* must not be called from interrupt context */
int ohci_restart(struct ohci_hcd *ohci)
{
int temp;
int i;
struct urb_priv *priv;
ohci_init(ohci);
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;
}
ohci_work(ohci);
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;
}
EXPORT_SYMBOL_GPL(ohci_restart);
#endif
#ifdef CONFIG_PM
int ohci_suspend(struct usb_hcd *hcd, bool do_wakeup)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
unsigned long flags;
int rc = 0;
/* Disable irq emission and mark HW unaccessible. Use
* the spinlock to properly synchronize with possible pending
* RH suspend or resume activity.
*/
spin_lock_irqsave (&ohci->lock, flags);
ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
(void)ohci_readl(ohci, &ohci->regs->intrdisable);
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
spin_unlock_irqrestore (&ohci->lock, flags);
synchronize_irq(hcd->irq);
if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
ohci_resume(hcd, false);
rc = -EBUSY;
}
return rc;
}
EXPORT_SYMBOL_GPL(ohci_suspend);
int ohci_resume(struct usb_hcd *hcd, bool hibernated)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int port;
bool need_reinit = false;
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
/* Make sure resume from hibernation re-enumerates everything */
if (hibernated)
ohci_usb_reset(ohci);
/* See if the controller is already running or has been reset */
ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
need_reinit = true;
} else {
switch (ohci->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_OPER:
case OHCI_USB_RESET:
need_reinit = true;
}
}
/* If needed, reinitialize and suspend the root hub */
if (need_reinit) {
spin_lock_irq(&ohci->lock);
ohci_rh_resume(ohci);
ohci_rh_suspend(ohci, 0);
spin_unlock_irq(&ohci->lock);
}
/* Normally just turn on port power and enable interrupts */
else {
ohci_dbg(ohci, "powerup ports\n");
for (port = 0; port < ohci->num_ports; port++)
ohci_writel(ohci, RH_PS_PPS,
&ohci->regs->roothub.portstatus[port]);
ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
ohci_readl(ohci, &ohci->regs->intrenable);
msleep(20);
}
usb_hcd_resume_root_hub(hcd);
return 0;
}
EXPORT_SYMBOL_GPL(ohci_resume);
#endif
/*-------------------------------------------------------------------------*/
/*
* Generic structure: This gets copied for platform drivers so that
* individual entries can be overridden as needed.
*/
static const struct hc_driver ohci_hc_driver = {
.description = hcd_name,
.product_desc = "OHCI Host Controller",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_MEMORY | HCD_USB11,
/*
* basic lifecycle operations
*/
.reset = ohci_setup,
.start = ohci_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ohci_get_frame,
/*
* root hub support
*/
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
void ohci_init_driver(struct hc_driver *drv,
const struct ohci_driver_overrides *over)
{
/* Copy the generic table to drv and then apply the overrides */
*drv = ohci_hc_driver;
if (over) {
drv->product_desc = over->product_desc;
drv->hcd_priv_size += over->extra_priv_size;
if (over->reset)
drv->reset = over->reset;
}
}
EXPORT_SYMBOL_GPL(ohci_init_driver);
/*-------------------------------------------------------------------------*/
MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE ("GPL");
#if defined(CONFIG_ARCH_SA1100) && defined(CONFIG_SA1111)
#include "ohci-sa1111.c"
#define SA1111_DRIVER ohci_hcd_sa1111_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_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
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);
ohci_debug_root = debugfs_create_dir("ohci", usb_debug_root);
#ifdef PS3_SYSTEM_BUS_DRIVER
retval = ps3_ohci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
if (retval < 0)
goto error_ps3;
#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 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 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 PS3_SYSTEM_BUS_DRIVER
ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
error_ps3:
#endif
debugfs_remove(ohci_debug_root);
ohci_debug_root = NULL;
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 SA1111_DRIVER
sa1111_driver_unregister(&SA1111_DRIVER);
#endif
#ifdef OF_PLATFORM_DRIVER
platform_driver_unregister(&OF_PLATFORM_DRIVER);
#endif
#ifdef PS3_SYSTEM_BUS_DRIVER
ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
#endif
debugfs_remove(ohci_debug_root);
clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
}
module_exit(ohci_hcd_mod_exit);
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