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linux/drivers/usb/host/ehci-au1xxx.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

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/*
* EHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
*
* Bus Glue for AMD Alchemy Au1xxx
*
* Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
*
* Modified for AMD Alchemy Au1200 EHC
* by K.Boge <karsten.boge@amd.com>
*
* This file is licenced under the GPL.
*/
#include <linux/platform_device.h>
#include <asm/mach-au1x00/au1000.h>
#define USB_HOST_CONFIG (USB_MSR_BASE + USB_MSR_MCFG)
#define USB_MCFG_PFEN (1<<31)
#define USB_MCFG_RDCOMB (1<<30)
#define USB_MCFG_SSDEN (1<<23)
#define USB_MCFG_PHYPLLEN (1<<19)
#define USB_MCFG_EHCCLKEN (1<<17)
#define USB_MCFG_UCAM (1<<7)
#define USB_MCFG_EBMEN (1<<3)
#define USB_MCFG_EMEMEN (1<<2)
#define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
#ifdef CONFIG_DMA_COHERENT
#define USBH_ENABLE_INIT (USBH_ENABLE_CE \
| USB_MCFG_PFEN | USB_MCFG_RDCOMB \
| USB_MCFG_SSDEN | USB_MCFG_UCAM \
| USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
#else
#define USBH_ENABLE_INIT (USBH_ENABLE_CE \
| USB_MCFG_PFEN | USB_MCFG_RDCOMB \
| USB_MCFG_SSDEN \
| USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
#endif
#define USBH_DISABLE (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
extern int usb_disabled(void);
/*-------------------------------------------------------------------------*/
static void au1xxx_start_ehc(struct platform_device *dev)
{
pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
/* write HW defaults again in case Yamon cleared them */
if (au_readl(USB_HOST_CONFIG) == 0) {
au_writel(0x00d02000, USB_HOST_CONFIG);
au_readl(USB_HOST_CONFIG);
udelay(1000);
}
/* enable host controller */
au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
au_readl(USB_HOST_CONFIG);
udelay(1000);
au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
USB_HOST_CONFIG);
au_readl(USB_HOST_CONFIG);
udelay(1000);
pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
}
static void au1xxx_stop_ehc(struct platform_device *dev)
{
pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
/* Disable mem */
au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
udelay(1000);
/* Disable clock */
au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
USB_HOST_CONFIG);
au_readl(USB_HOST_CONFIG);
}
/*-------------------------------------------------------------------------*/
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
/**
* usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
* Context: !in_interrupt()
*
* Allocates basic resources for this USB host controller, and
* then invokes the start() method for the HCD associated with it
* through the hotplug entry's driver_data.
*
*/
int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
struct usb_hcd **hcd_out, struct platform_device *dev)
{
int retval;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
/* Au1200 AB USB does not support coherent memory */
if (!(read_c0_prid() & 0xff)) {
pr_info("%s: this is chip revision AB!\n", dev->name);
pr_info("%s: update your board or re-configure the kernel\n",
dev->name);
return -ENODEV;
}
#endif
au1xxx_start_ehc(dev);
if (dev->resource[1].flags != IORESOURCE_IRQ) {
pr_debug("resource[1] is not IORESOURCE_IRQ");
retval = -ENOMEM;
}
hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = dev->resource[0].start;
hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
pr_debug("request_mem_region failed");
retval = -EBUSY;
goto err1;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
pr_debug("ioremap failed");
retval = -ENOMEM;
goto err2;
}
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = readl(&ehci->caps->hcs_params);
/* ehci_hcd_init(hcd_to_ehci(hcd)); */
retval =
usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
if (retval == 0)
return retval;
au1xxx_stop_ehc(dev);
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
return retval;
}
/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */
/**
* usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*
*/
void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
{
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
au1xxx_stop_ehc(dev);
}
/*-------------------------------------------------------------------------*/
static const struct hc_driver ehci_au1xxx_hc_driver = {
.description = hcd_name,
.product_desc = "Au1xxx EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_init,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
#ifdef CONFIG_PM
.hub_suspend = ehci_hub_suspend,
.hub_resume = ehci_hub_resume,
#endif
};
/*-------------------------------------------------------------------------*/
static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd = NULL;
int ret;
pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
if (usb_disabled())
return -ENODEV;
ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
return ret;
}
static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_ehci_au1xxx_remove(hcd, pdev);
return 0;
}
/*TBD*/
/*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct usb_hcd *hcd = dev_get_drvdata(dev);
return 0;
}
static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct usb_hcd *hcd = dev_get_drvdata(dev);
return 0;
}
*/
MODULE_ALIAS("au1xxx-ehci");
static struct platform_driver ehci_hcd_au1xxx_driver = {
.probe = ehci_hcd_au1xxx_drv_probe,
.remove = ehci_hcd_au1xxx_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
/*.suspend = ehci_hcd_au1xxx_drv_suspend, */
/*.resume = ehci_hcd_au1xxx_drv_resume, */
.driver = {
.name = "au1xxx-ehci",
.bus = &platform_bus_type
}
};
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