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linux/drivers/usb/host/ohci-au1xxx.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

284 lines
6.9 KiB
C
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/*
* 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 AMD Alchemy Au1xxx
*
* Written by Christopher Hoover <ch@hpl.hp.com>
* Based on fragments of previous driver by Rusell King et al.
*
* Modified for LH7A404 from ohci-sa1111.c
* by Durgesh Pattamatta <pattamattad@sharpsec.com>
* Modified for AMD Alchemy Au1xxx
* by Matt Porter <mporter@kernel.crashing.org>
*
* This file is licenced under the GPL.
*/
#include <asm/mach-au1x00/au1000.h>
#define USBH_ENABLE_BE (1<<0)
#define USBH_ENABLE_C (1<<1)
#define USBH_ENABLE_E (1<<2)
#define USBH_ENABLE_CE (1<<3)
#define USBH_ENABLE_RD (1<<4)
#ifdef __LITTLE_ENDIAN
#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
#elif __BIG_ENDIAN
#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE)
#else
#error not byte order defined
#endif
extern int usb_disabled(void);
/*-------------------------------------------------------------------------*/
static void au1xxx_start_hc(struct platform_device *dev)
{
printk(KERN_DEBUG __FILE__
": starting Au1xxx OHCI USB Controller\n");
/* enable host controller */
au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
udelay(1000);
au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
udelay(1000);
/* wait for reset complete (read register twice; see au1500 errata) */
while (au_readl(USB_HOST_CONFIG),
!(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
udelay(1000);
printk(KERN_DEBUG __FILE__
": Clock to USB host has been enabled \n");
}
static void au1xxx_stop_hc(struct platform_device *dev)
{
printk(KERN_DEBUG __FILE__
": stopping Au1xxx OHCI USB Controller\n");
/* Disable clock */
au_writel(readl((void *)USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
}
/*-------------------------------------------------------------------------*/
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
/**
* usb_hcd_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_hcd_au1xxx_probe (const struct hc_driver *driver,
struct platform_device *dev)
{
int retval;
struct usb_hcd *hcd;
if(dev->resource[1].flags != IORESOURCE_IRQ) {
pr_debug ("resource[1] is not IORESOURCE_IRQ");
return -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;
}
au1xxx_start_hc(dev);
ohci_hcd_init(hcd_to_ohci(hcd));
retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
if (retval == 0)
return retval;
au1xxx_stop_hc(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_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_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_hcd_au1xxx_remove (struct usb_hcd *hcd, struct platform_device *dev)
{
usb_remove_hcd(hcd);
au1xxx_stop_hc(dev);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
}
/*-------------------------------------------------------------------------*/
static int __devinit
ohci_au1xxx_start (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int ret;
ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
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 const struct hc_driver ohci_au1xxx_hc_driver = {
.description = hcd_name,
.product_desc = "Au1xxx OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
/*
* basic lifecycle operations
*/
.start = ohci_au1xxx_start,
#ifdef CONFIG_PM
/* suspend: ohci_au1xxx_suspend, -- tbd */
/* resume: ohci_au1xxx_resume, -- tbd */
#endif /*CONFIG_PM*/
.stop = ohci_stop,
/*
* 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,
};
/*-------------------------------------------------------------------------*/
static int ohci_hcd_au1xxx_drv_probe(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
int ret;
pr_debug ("In ohci_hcd_au1xxx_drv_probe");
if (usb_disabled())
return -ENODEV;
ret = usb_hcd_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
return ret;
}
static int ohci_hcd_au1xxx_drv_remove(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct usb_hcd *hcd = dev_get_drvdata(dev);
usb_hcd_au1xxx_remove(hcd, pdev);
return 0;
}
/*TBD*/
/*static int ohci_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 ohci_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;
}
*/
static struct device_driver ohci_hcd_au1xxx_driver = {
.name = "au1xxx-ohci",
.bus = &platform_bus_type,
.probe = ohci_hcd_au1xxx_drv_probe,
.remove = ohci_hcd_au1xxx_drv_remove,
/*.suspend = ohci_hcd_au1xxx_drv_suspend, */
/*.resume = ohci_hcd_au1xxx_drv_resume, */
};
static int __init ohci_hcd_au1xxx_init (void)
{
pr_debug (DRIVER_INFO " (Au1xxx)");
pr_debug ("block sizes: ed %d td %d\n",
sizeof (struct ed), sizeof (struct td));
return driver_register(&ohci_hcd_au1xxx_driver);
}
static void __exit ohci_hcd_au1xxx_cleanup (void)
{
driver_unregister(&ohci_hcd_au1xxx_driver);
}
module_init (ohci_hcd_au1xxx_init);
module_exit (ohci_hcd_au1xxx_cleanup);
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