linux/drivers/usb/host/ehci-w90x900.c
Alan Stern 1a49e2ac96 EHCI: centralize controller initialization
This patch (as1564c) converts the EHCI platform drivers to use the
central ehci_setup() routine for generic controller initialization
rather than each having its own idiosyncratic approach.

The major point of difficulty lies in ehci-pci's many vendor- and
device-specific workarounds.  Some of them have to be applied before
calling ehci_setup() and some after, which necessitates a fair amount
of code motion.  The other platform drivers require much smaller
changes.

One point not addressed by the patch is whether ports should be
powered on or off following initialization.  The different drivers
appear to handle this pretty much at random.  In fact it shouldn't
matter, because the hub driver turns on power to all ports when it
binds to the root hub.  Straightening that out will be left for
another day.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-09 13:35:05 -07:00

180 lines
3.9 KiB
C

/*
* linux/driver/usb/host/ehci-w90x900.c
*
* Copyright (c) 2008 Nuvoton technology corporation.
*
* Wan ZongShun <mcuos.com@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation;version 2 of the License.
*
*/
#include <linux/platform_device.h>
/*ebable phy0 and phy1 for w90p910*/
#define ENPHY (0x01<<8)
#define PHY0_CTR (0xA4)
#define PHY1_CTR (0xA8)
static int __devinit usb_w90x900_probe(const struct hc_driver *driver,
struct platform_device *pdev)
{
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct resource *res;
int retval = 0, irq;
unsigned long val;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
retval = -ENXIO;
goto err1;
}
hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI");
if (!hcd) {
retval = -ENOMEM;
goto err1;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
retval = -EBUSY;
goto err2;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (hcd->regs == NULL) {
retval = -EFAULT;
goto err3;
}
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
ehci->regs = hcd->regs +
HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
/* enable PHY 0,1,the regs only apply to w90p910
* 0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
* w90p910 IC relative to ehci->regs.
*/
val = __raw_readl(ehci->regs+PHY0_CTR);
val |= ENPHY;
__raw_writel(val, ehci->regs+PHY0_CTR);
val = __raw_readl(ehci->regs+PHY1_CTR);
val |= ENPHY;
__raw_writel(val, ehci->regs+PHY1_CTR);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
goto err4;
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval != 0)
goto err4;
return retval;
err4:
iounmap(hcd->regs);
err3:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err2:
usb_put_hcd(hcd);
err1:
return retval;
}
static
void usb_w90x900_remove(struct usb_hcd *hcd, struct platform_device *pdev)
{
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_w90x900_hc_driver = {
.description = hcd_name,
.product_desc = "Nuvoton w90x900 EHCI Host Controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_USB2|HCD_MEMORY,
/*
* basic lifecycle operations
*/
.reset = ehci_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,
.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,
#ifdef CONFIG_PM
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
#endif
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int __devinit ehci_w90x900_probe(struct platform_device *pdev)
{
if (usb_disabled())
return -ENODEV;
return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
}
static int __devexit ehci_w90x900_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_w90x900_remove(hcd, pdev);
return 0;
}
static struct platform_driver ehci_hcd_w90x900_driver = {
.probe = ehci_w90x900_probe,
.remove = __devexit_p(ehci_w90x900_remove),
.driver = {
.name = "w90x900-ehci",
.owner = THIS_MODULE,
},
};
MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("w90p910 usb ehci driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:w90p910-ehci");