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linux/drivers/usb/host/ohci-au1xxx.c
David Brownell d413984ae9 USB: OHCI avoids root hub timer polling 
This teaches OHCI to use the root hub status change (RHSC) IRQ, bypassing
root hub timers most of the time and switching over to the "new" root hub
polling scheme.  It's complicated by the fact that implementations of OHCI
trigger and ack that IRQ differently (the spec is vague there).

Avoiding root hub timers helps mechanisms like "dynamic tick" leave the
CPU in lowpower modes for longer intervals.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-09-27 11:58:48 -07:00

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9.0 KiB
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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 <linux/platform_device.h>
#include <linux/signal.h>
#include <asm/mach-au1x00/au1000.h>
#ifndef CONFIG_SOC_AU1200
#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
#else /* Au1200 */
#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_OHCCLKEN (1<<16)
#define USB_MCFG_UCAM (1<<7)
#define USB_MCFG_OBMEN (1<<1)
#define USB_MCFG_OMEMEN (1<<0)
#define USBH_ENABLE_CE USB_MCFG_OHCCLKEN
#ifdef CONFIG_DMA_COHERENT
#define USBH_ENABLE_INIT (USB_MCFG_OHCCLKEN \
| USB_MCFG_PFEN | USB_MCFG_RDCOMB \
| USB_MCFG_SSDEN | USB_MCFG_UCAM \
| USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
#else
#define USBH_ENABLE_INIT (USB_MCFG_OHCCLKEN \
| USB_MCFG_PFEN | USB_MCFG_RDCOMB \
| USB_MCFG_SSDEN \
| USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
#endif
#define USBH_DISABLE (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
#endif /* Au1200 */
extern int usb_disabled(void);
/*-------------------------------------------------------------------------*/
static void au1xxx_start_ohc(struct platform_device *dev)
{
printk(KERN_DEBUG __FILE__
": starting Au1xxx OHCI USB Controller\n");
/* enable host controller */
#ifndef CONFIG_SOC_AU1200
au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
udelay(1000);
au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
udelay(1000);
#else /* Au1200 */
/* 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);
}
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);
#endif /* Au1200 */
#ifndef CONFIG_SOC_AU1200
/* wait for reset complete (read register twice; see au1500 errata) */
while (au_readl(USB_HOST_CONFIG),
!(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
#endif
udelay(1000);
printk(KERN_DEBUG __FILE__
": Clock to USB host has been enabled \n");
}
static void au1xxx_stop_ohc(struct platform_device *dev)
{
printk(KERN_DEBUG __FILE__
": stopping Au1xxx OHCI USB Controller\n");
#ifndef CONFIG_SOC_AU1200
/* Disable clock */
au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
#else /* Au1200 */
/* Disable mem */
au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
udelay(1000);
/* Disable clock */
au_writel(~USBH_ENABLE_CE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
au_readl(USB_HOST_CONFIG);
#endif /* Au1200 */
}
/*-------------------------------------------------------------------------*/
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
/**
* usb_ohci_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.
*
*/
static int usb_ohci_au1xxx_probe(const struct hc_driver *driver,
struct platform_device *dev)
{
int retval;
struct usb_hcd *hcd;
#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
if (dev->resource[1].flags != IORESOURCE_IRQ) {
pr_debug("resource[1] is not IORESOURCE_IRQ\n");
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\n");
retval = -EBUSY;
goto err1;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
pr_debug("ioremap failed\n");
retval = -ENOMEM;
goto err2;
}
au1xxx_start_ohc(dev);
ohci_hcd_init(hcd_to_ohci(hcd));
retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
if (retval == 0)
return retval;
au1xxx_stop_ohc(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.
*
*/
static void usb_ohci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
{
usb_remove_hcd(hcd);
au1xxx_stop_ohc(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,
.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,
.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,
};
/*-------------------------------------------------------------------------*/
static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
{
int ret;
pr_debug ("In ohci_hcd_au1xxx_drv_probe");
if (usb_disabled())
return -ENODEV;
ret = usb_ohci_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
return ret;
}
static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_ohci_au1xxx_remove(hcd, pdev);
return 0;
}
/*TBD*/
/*static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
return 0;
}
static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
return 0;
}
*/
static struct platform_driver ohci_hcd_au1xxx_driver = {
.probe = ohci_hcd_au1xxx_drv_probe,
.remove = ohci_hcd_au1xxx_drv_remove,
/*.suspend = ohci_hcd_au1xxx_drv_suspend, */
/*.resume = ohci_hcd_au1xxx_drv_resume, */
.driver = {
.name = "au1xxx-ohci",
.owner = THIS_MODULE,
},
};
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 platform_driver_register(&ohci_hcd_au1xxx_driver);
}
static void __exit ohci_hcd_au1xxx_cleanup (void)
{
platform_driver_unregister(&ohci_hcd_au1xxx_driver);
}
module_init (ohci_hcd_au1xxx_init);
module_exit (ohci_hcd_au1xxx_cleanup);
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