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/*
* Bus Glue for the built-in EHCI controller of the Ralink RT3662/RT3883 SoCs
*
* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
*
* Parts of this file are based on Ralink's 2.6.21 BSP
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/platform_device.h>
#include <asm/mach-ralink/rt3883.h>
#include <asm/mach-ralink/rt3883_ehci_platform.h>
static int ehci_rt3883_init(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int ret;
ehci->caps = hcd->regs;
ehci->regs = hcd->regs +
HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
dbg_hcs_params(ehci, "reset");
dbg_hcc_params(ehci, "reset");
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
ehci->sbrn = 0x20;
ehci_reset(ehci);
ret = ehci_init(hcd);
if (ret)
return ret;
ehci_port_power(ehci, 0);
return 0;
}
static const struct hc_driver ehci_rt3883_hc_driver = {
.description = hcd_name,
.product_desc = "Ralink RT3883 built-in EHCI controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
.reset = ehci_rt3883_init,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
.get_frame_number = ehci_get_frame,
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int ehci_rt3883_probe(struct platform_device *pdev)
{
struct rt3883_ehci_platform_data *pdata;
struct usb_hcd *hcd;
struct resource *res;
int irq;
int ret;
if (usb_disabled())
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res) {
dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
dev_name(&pdev->dev));
return -ENODEV;
}
irq = res->start;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_dbg(&pdev->dev, "no base address specified for %s\n",
dev_name(&pdev->dev));
return -ENODEV;
}
hcd = usb_create_hcd(&ehci_rt3883_hc_driver, &pdev->dev,
dev_name(&pdev->dev));
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = res->start;
hcd->rsrc_len = res->end - res->start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
dev_dbg(&pdev->dev, "controller already in use\n");
ret = -EBUSY;
goto err_put_hcd;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
dev_dbg(&pdev->dev, "error mapping memory\n");
ret = -EFAULT;
goto err_release_region;
}
pdata = pdev->dev.platform_data;
if (pdata && pdata->start_hw)
pdata->start_hw();
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (ret)
goto err_iounmap;
return 0;
err_iounmap:
iounmap(hcd->regs);
err_release_region:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_put_hcd:
usb_put_hcd(hcd);
return ret;
}
static int ehci_rt3883_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct rt3883_ehci_platform_data *pdata;
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
pdata = pdev->dev.platform_data;
if (pdata && pdata->stop_hw)
pdata->stop_hw();
return 0;
}
static struct platform_driver ehci_rt3883_driver = {
.probe = ehci_rt3883_probe,
.remove = ehci_rt3883_remove,
.driver = {
.owner = THIS_MODULE,
.name = "rt3883-ehci",
}
};
MODULE_ALIAS("platform:rt3883-ehci");
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