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/*
* EHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 2006-2007 Stefan Roese <sr@denx.de>, DENX Software Engineering
*
* Bus Glue for PPC On-Chip EHCI driver
* Tested on AMCC 440EPx
*
* Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com>
*
* This file is licenced under the GPL.
*/
#include <linux/platform_device.h>
extern int usb_disabled(void);
/* called during probe() after chip reset completes */
static int ehci_ppc_soc_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int retval;
retval = ehci_halt(ehci);
if (retval)
return retval;
retval = ehci_init(hcd);
if (retval)
return retval;
ehci->sbrn = 0x20;
return ehci_reset(ehci);
}
/**
* usb_ehci_ppc_soc_probe - initialize PPC-SoC-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_ppc_soc_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 (dev->resource[1].flags != IORESOURCE_IRQ) {
pr_debug("resource[1] is not IORESOURCE_IRQ");
retval = -ENOMEM;
}
hcd = usb_create_hcd(driver, &dev->dev, "PPC-SOC EHCI");
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->big_endian_mmio = 1;
ehci->big_endian_desc = 1;
ehci->caps = hcd->regs;
ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
#if defined(CONFIG_440EPX)
/*
* 440EPx Errata USBH_3
* Fix: Enable Break Memory Transfer (BMT) in INSNREG3
*/
out_be32((void *)((ulong)(&ehci->regs->command) + 0x8c), (1 << 0));
ehci_dbg(ehci, "Break Memory Transfer (BMT) has beed enabled!\n");
#endif
retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
if (retval == 0)
return retval;
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_ppc_soc_remove - shutdown processing for PPC-SoC-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_ehci_hcd_ppc_soc_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_ppc_soc_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);
}
static const struct hc_driver ehci_ppc_soc_hc_driver = {
.description = hcd_name,
.product_desc = "PPC-SOC EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_ppc_soc_setup,
.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,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
};
static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd = NULL;
int ret;
pr_debug("In ehci_hcd_ppc_soc_drv_probe\n");
if (usb_disabled())
return -ENODEV;
ret = usb_ehci_ppc_soc_probe(&ehci_ppc_soc_hc_driver, &hcd, pdev);
return ret;
}
static int ehci_hcd_ppc_soc_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_ehci_ppc_soc_remove(hcd, pdev);
return 0;
}
MODULE_ALIAS("ppc-soc-ehci");
static struct platform_driver ehci_ppc_soc_driver = {
.probe = ehci_hcd_ppc_soc_drv_probe,
.remove = ehci_hcd_ppc_soc_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "ppc-soc-ehci",
.bus = &platform_bus_type
}
};
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