linux/drivers/usb/host/ohci-ep93xx.c
Aleksey Gorelov 64a21d025d USB: Properly unregister reboot notifier in case of failure in ehci hcd
If some problem occurs during ehci startup, for instance, request_irq fails,
echi hcd driver tries it best to cleanup, but fails to unregister reboot
notifier, which in turn leads to crash on reboot/poweroff.

The following patch resolves this problem by not using reboot notifiers
anymore, but instead making ehci/ohci driver get its own shutdown method.  For
PCI, it is done through pci glue, for everything else through platform driver
glue.

One downside: sa1111 does not use platform driver stuff, and does not have its
own shutdown hook, so no 'shutdown' is called for it now.  I'm not sure if it
is really necessary on that platform, though.

Signed-off-by: Aleks Gorelov <dared1st@yahoo.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-09-27 11:58:54 -07:00

228 lines
5.2 KiB
C

/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
* (C) Copyright 2002 Hewlett-Packard Company
*
* Bus Glue for ep93xx.
*
* Written by Christopher Hoover <ch@hpl.hp.com>
* Based on fragments of previous driver by Russell King et al.
*
* Modified for LH7A404 from ohci-sa1111.c
* by Durgesh Pattamatta <pattamattad@sharpsec.com>
*
* Modified for pxa27x from ohci-lh7a404.c
* by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
*
* Modified for ep93xx from ohci-pxa27x.c
* by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
* Based on an earlier driver by Ray Lehtiniemi
*
* This file is licenced under the GPL.
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/signal.h>
#include <linux/platform_device.h>
#include <asm/mach-types.h>
#include <asm/hardware.h>
static struct clk *usb_host_clock;
static void ep93xx_start_hc(struct device *dev)
{
clk_enable(usb_host_clock);
}
static void ep93xx_stop_hc(struct device *dev)
{
clk_disable(usb_host_clock);
}
static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
struct platform_device *pdev)
{
int retval;
struct usb_hcd *hcd;
if (pdev->resource[1].flags != IORESOURCE_IRQ) {
pr_debug("resource[1] is not IORESOURCE_IRQ");
return -ENOMEM;
}
hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
if (hcd == NULL)
return -ENOMEM;
hcd->rsrc_start = pdev->resource[0].start;
hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
usb_put_hcd(hcd);
retval = -EBUSY;
goto err1;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (hcd->regs == NULL) {
pr_debug("ioremap failed");
retval = -ENOMEM;
goto err2;
}
usb_host_clock = clk_get(&pdev->dev, "usb_host");
ep93xx_start_hc(&pdev->dev);
ohci_hcd_init(hcd_to_ohci(hcd));
retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
if (retval == 0)
return retval;
ep93xx_stop_hc(&pdev->dev);
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
return retval;
}
static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
struct platform_device *pdev)
{
usb_remove_hcd(hcd);
ep93xx_stop_hc(&pdev->dev);
clk_put(usb_host_clock);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
}
static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
if ((ret = ohci_init(ohci)) < 0)
return ret;
if ((ret = ohci_run(ohci)) < 0) {
err("can't start %s", hcd->self.bus_name);
ohci_stop(hcd);
return ret;
}
return 0;
}
static struct hc_driver ohci_ep93xx_hc_driver = {
.description = hcd_name,
.product_desc = "EP93xx OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
.start = ohci_ep93xx_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
.get_frame_number = ohci_get_frame,
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
.hub_irq_enable = ohci_rhsc_enable,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
extern int usb_disabled(void);
static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
{
int ret;
ret = -ENODEV;
if (!usb_disabled())
ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
return ret;
}
static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_hcd_ep93xx_remove(hcd, pdev);
return 0;
}
#ifdef CONFIG_PM
static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ochi_hcd *ohci = hcd_to_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
ep93xx_stop_hc(&pdev->dev);
hcd->state = HC_STATE_SUSPENDED;
pdev->dev.power.power_state = PMSG_SUSPEND;
return 0;
}
static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int status;
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
ep93xx_start_hc(&pdev->dev);
pdev->dev.power.power_state = PMSG_ON;
usb_hcd_resume_root_hub(hcd);
return 0;
}
#endif
static struct platform_driver ohci_hcd_ep93xx_driver = {
.probe = ohci_hcd_ep93xx_drv_probe,
.remove = ohci_hcd_ep93xx_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
.suspend = ohci_hcd_ep93xx_drv_suspend,
.resume = ohci_hcd_ep93xx_drv_resume,
#endif
.driver = {
.name = "ep93xx-ohci",
},
};
static int __init ohci_hcd_ep93xx_init(void)
{
return platform_driver_register(&ohci_hcd_ep93xx_driver);
}
static void __exit ohci_hcd_ep93xx_cleanup(void)
{
platform_driver_unregister(&ohci_hcd_ep93xx_driver);
}
module_init(ohci_hcd_ep93xx_init);
module_exit(ohci_hcd_ep93xx_cleanup);