/*
* EHCI HCD (Host Controller Driver) for USB.
*
* 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
*
* FIXME -- ehci_init() doesn't do enough here.
* See ehci-ppc-soc for a complete implementation.
*/
.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
}
};
