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linux/drivers/usb/host/ohci-au1xxx.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 Russell 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)
#ifdef CONFIG_DMA_COHERENT
#define USB_MCFG_UCAM (1<<7)
#else
#define USB_MCFG_UCAM (0)
#endif
#define USB_MCFG_OBMEN (1<<1)
#define USB_MCFG_OMEMEN (1<<0)
#define USBH_ENABLE_CE USB_MCFG_OHCCLKEN
#define USBH_ENABLE_INIT (USB_MCFG_PFEN | USB_MCFG_RDCOMB | \
USBH_ENABLE_CE | USB_MCFG_SSDEN | \
USB_MCFG_UCAM | \
USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
#define USBH_DISABLE (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
#endif /* Au1200 */
extern int usb_disabled(void);
static void au1xxx_start_ohc(void)
{
/* enable host controller */
#ifndef CONFIG_SOC_AU1200
au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
au_sync();
udelay(1000);
au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
au_sync();
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);
#else /* Au1200 */
au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG);
au_sync();
udelay(1000);
au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
au_sync();
udelay(2000);
#endif /* Au1200 */
}
static void au1xxx_stop_ohc(void)
{
#ifdef CONFIG_SOC_AU1200
/* Disable mem */
au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG);
au_sync();
udelay(1000);
#endif
/* Disable clock */
au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
au_sync();
}
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,
.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,
};
static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
{
int ret;
struct usb_hcd *hcd;
if (usb_disabled())
return -ENODEV;
#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
/* Au1200 AB USB does not support coherent memory */
if (!(read_c0_prid() & 0xff)) {
printk(KERN_INFO "%s: this is chip revision AB !!\n",
pdev->name);
printk(KERN_INFO "%s: update your board or re-configure "
"the kernel\n", pdev->name);
return -ENODEV;
}
#endif
if (pdev->resource[1].flags != IORESOURCE_IRQ) {
pr_debug("resource[1] is not IORESOURCE_IRQ\n");
return -ENOMEM;
}
hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
if (!hcd)
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)) {
pr_debug("request_mem_region failed\n");
ret = -EBUSY;
goto err1;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
pr_debug("ioremap failed\n");
ret = -ENOMEM;
goto err2;
}
au1xxx_start_ohc();
ohci_hcd_init(hcd_to_ohci(hcd));
ret = usb_add_hcd(hcd, pdev->resource[1].start,
IRQF_DISABLED | IRQF_SHARED);
if (ret == 0) {
platform_set_drvdata(pdev, hcd);
return ret;
}
au1xxx_stop_ohc();
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
return ret;
}
static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
au1xxx_stop_ohc();
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
platform_set_drvdata(pdev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *pdev,
pm_message_t message)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
unsigned long flags;
int rc;
rc = 0;
/* Root hub was already suspended. Disable irq emission and
* mark HW unaccessible, bail out if RH has been resumed. Use
* the spinlock to properly synchronize with possible pending
* RH suspend or resume activity.
*
* This is still racy as hcd->state is manipulated outside of
* any locks =P But that will be a different fix.
*/
spin_lock_irqsave(&ohci->lock, flags);
if (hcd->state != HC_STATE_SUSPENDED) {
rc = -EINVAL;
goto bail;
}
ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
(void)ohci_readl(ohci, &ohci->regs->intrdisable);
/* make sure snapshot being resumed re-enumerates everything */
if (message.event == PM_EVENT_PRETHAW)
ohci_usb_reset(ohci);
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
au1xxx_stop_ohc();
bail:
spin_unlock_irqrestore(&ohci->lock, flags);
return rc;
}
static int ohci_hcd_au1xxx_drv_resume(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
au1xxx_start_ohc();
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
ohci_finish_controller_resume(hcd);
return 0;
}
#else
#define ohci_hcd_au1xxx_drv_suspend NULL
#define ohci_hcd_au1xxx_drv_resume NULL
#endif
static struct platform_driver ohci_hcd_au1xxx_driver = {
.probe = ohci_hcd_au1xxx_drv_probe,
.remove = ohci_hcd_au1xxx_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.suspend = ohci_hcd_au1xxx_drv_suspend,
.resume = ohci_hcd_au1xxx_drv_resume,
.driver = {
.name = "au1xxx-ohci",
.owner = THIS_MODULE,
},
};
MODULE_ALIAS("platform:au1xxx-ohci");
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