satip-axe/kernel/drivers/usb/host/ehci-stcore.c
2015-03-26 17:24:57 +01:00

238 lines
5.3 KiB
C

/*
* EHCI HCD (Host Controller Driver) for USB.
*
* Copyright (c) 2005 STMicroelectronics Limited
* Author: Mark Glaisher <mark.glaisher@st.com>
*
* Bus Glue for STMicroelectronics STx710x devices.
*
* This file is licenced under the GPL.
*/
#include <linux/platform_device.h>
#include "./hcd-stm.h"
/* Define a bus wrapper IN/OUT threshold of 128 */
#define AHB2STBUS_INSREG01_OFFSET (0x10 + 0x84) /* From EHCI_BASE */
#define AHB2STBUS_INOUT_THRESHOLD 0x00800080
#undef dgb_print
#ifdef CONFIG_USB_DEBUG
#define dgb_print(fmt, args...) \
pr_debug("%s: " fmt, __func__, ## args)
#else
#define dgb_print(fmt, args...)
#endif
static int ehci_st40_reset(struct usb_hcd *hcd)
{
writel(AHB2STBUS_INOUT_THRESHOLD,
hcd->regs + AHB2STBUS_INSREG01_OFFSET);
return ehci_init(hcd);
}
#ifdef CONFIG_PM
static int
stm_ehci_bus_suspend(struct usb_hcd *hcd)
{
ehci_bus_suspend(hcd);
/*
* force the root hub to be resetted on resume!
* re-enumerates everything during a standby, mem and hibernation...
*/
usb_root_hub_lost_power(hcd->self.root_hub);
return 0;
}
static int
stm_ehci_bus_resume(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci;
ehci = hcd_to_ehci(hcd);
ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
return ehci_bus_resume(hcd);
}
#else
#define stm_ehci_bus_suspend NULL
#define stm_ehci_bus_resume NULL
#endif
static const struct hc_driver ehci_stm_hc_driver = {
.description = hcd_name,
.product_desc = "st-ehci",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_st40_reset,
.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,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
/*
* The ehci_bus_suspend suspends all the root hub ports but
* it leaves all the interrupts enabled on insert/remove devices
*/
.bus_suspend = stm_ehci_bus_suspend,
.bus_resume = stm_ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int ehci_hcd_stm_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
return 0;
}
static int ehci_hcd_stm_probe(struct platform_device *pdev)
{
int retval = 0;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct device *dev = &pdev->dev;
struct resource *res;
struct platform_device *stm_usb_pdev;
dgb_print("\n");
hcd = usb_create_hcd(&ehci_stm_hc_driver, dev, dev_name(dev));
if (!hcd) {
retval = -ENOMEM;
goto err0;
}
stm_usb_pdev = to_platform_device(pdev->dev.parent);
res = platform_get_resource_byname(stm_usb_pdev,
IORESOURCE_MEM, "ehci");
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
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(ehci_readl(ehci,
&ehci->caps->hc_capbase));
/* cache this readonly data; minimize device reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
/*
* Fix the reset port issue on a load-unload-load sequence
*/
ehci->has_reset_port_bug = 1,
res = platform_get_resource_byname(stm_usb_pdev,
IORESOURCE_IRQ, "ehci");
retval = usb_add_hcd(hcd, res->start, 0);
if (unlikely(retval))
goto err3;
#ifdef CONFIG_PM
hcd->self.root_hub->do_remote_wakeup = 0;
hcd->self.root_hub->persist_enabled = 0;
hcd->self.root_hub->autosuspend_disabled = 1;
hcd->self.root_hub->autoresume_disabled = 1;
#endif
return 0;
err3:
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
err0:
return retval;
}
static struct platform_driver ehci_hcd_stm_driver = {
.probe = ehci_hcd_stm_probe,
.remove = ehci_hcd_stm_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "stm-ehci",
},
};
#ifdef CONFIG_PM_RUNTIME
static DEFINE_MUTEX(stm_ehci_usb_mutex); /* to serialize the operations.. */
int stm_ehci_hcd_unregister(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
int ret = 0;
if (!hcd)
return ret;
mutex_lock(&stm_ehci_usb_mutex);
ret = ehci_hcd_stm_remove(dev);
mutex_unlock(&stm_ehci_usb_mutex);
if (ret)
dgb_print("[STM][USB] Error on %s 0x%x\n", __func__, dev);
return ret;
}
EXPORT_SYMBOL(stm_ehci_hcd_unregister);
int stm_ehci_hcd_register(struct platform_device *dev)
{
int ret = 0;
mutex_lock(&stm_ehci_usb_mutex);
ret = ehci_hcd_stm_probe(dev);
mutex_unlock(&stm_ehci_usb_mutex);
if (ret)
dgb_print("[STM][USB] Error on %s 0x%x\n", __func__, dev);
return ret;
}
EXPORT_SYMBOL(stm_ehci_hcd_register);
#endif