/*
* OHCI HCD (Host Controller Driver) for USB.
*
* Copyright (C) 2004 SAN People (Pty) Ltd.
* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
*
* AT91RM9200 Bus Glue
*
* Based on fragments of 2.4 driver by Rick Bronson.
* Based on ohci-omap.c
*
* This file is licenced under the GPL.
*/
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <asm/mach-types.h>
#include <asm/hardware.h>
#include <asm/arch/board.h>
#ifndef CONFIG_ARCH_AT91RM9200
#error "This file is AT91RM9200 bus glue. CONFIG_ARCH_AT91RM9200 must be defined."
#endif
/* interface and function clocks */
static struct clk *iclk, *fclk;
extern int usb_disabled(void);
/*-------------------------------------------------------------------------*/
static void at91_start_hc(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_regs __iomem *regs = hcd->regs;
dev_dbg(&pdev->dev, "starting AT91RM9200 OHCI USB Controller\n");
/*
* Start the USB clocks.
*/
clk_enable(iclk);
clk_enable(fclk);
/*
* The USB host controller must remain in reset.
*/
writel(0, ®s->control);
}
static void at91_stop_hc(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_regs __iomem *regs = hcd->regs;
dev_dbg(&pdev->dev, "stopping AT91RM9200 OHCI USB Controller\n");
/*
* Put the USB host controller into reset.
*/
writel(0, ®s->control);
/*
* Stop the USB clocks.
*/
clk_disable(fclk);
clk_disable(iclk);
}
/*-------------------------------------------------------------------------*/
static int usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
/**
* usb_hcd_at91_probe - initialize AT91RM9200-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.
*
* Store this function in the HCD's struct pci_driver as probe().
*/
int usb_hcd_at91_probe (const struct hc_driver *driver, struct platform_device *pdev)
{
int retval;
struct usb_hcd *hcd = NULL;
if (pdev->num_resources != 2) {
pr_debug("hcd probe: invalid num_resources");
return -ENODEV;
}
if ((pdev->resource[0].flags != IORESOURCE_MEM) || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
pr_debug("hcd probe: invalid resource type\n");
return -ENODEV;
}
hcd = usb_create_hcd(driver, &pdev->dev, "at91rm9200");
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = pdev->resource[0].start;
hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
pr_debug("request_mem_region failed\n");
retval = -EBUSY;
goto err1;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
pr_debug("ioremap failed\n");
retval = -EIO;
goto err2;
}
iclk = clk_get(&pdev->dev, "ohci_clk");
fclk = clk_get(&pdev->dev, "uhpck");
at91_start_hc(pdev);
ohci_hcd_init(hcd_to_ohci(hcd));
retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
if (retval == 0)
return retval;
/* Error handling */
at91_stop_hc(pdev);
clk_put(fclk);
clk_put(iclk);
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_hcd_at91_remove - shutdown processing for AT91RM9200-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_hcd_at91_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*
*/
static int usb_hcd_at91_remove (struct usb_hcd *hcd, struct platform_device *pdev)
{
usb_remove_hcd(hcd);
at91_stop_hc(pdev);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
clk_put(fclk);
clk_put(iclk);
fclk = iclk = NULL;
dev_set_drvdata(&pdev->dev, NULL);
return 0;
}
/*-------------------------------------------------------------------------*/
static int __devinit
ohci_at91_start (struct usb_hcd *hcd)
{
// struct at91_ohci_data *board = hcd->self.controller->platform_data;
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int ret;
if ((ret = ohci_init(ohci)) < 0)
return ret;
if ((ret = ohci_run(ohci)) < 0) {
err("can't start %s", hcd->self.bus_name);
ohci_stop(hcd);
return ret;
}
// hcd->self.root_hub->maxchild = board->ports;
return 0;
}
/*-------------------------------------------------------------------------*/
static const struct hc_driver ohci_at91_hc_driver = {
.description = hcd_name,
.product_desc = "AT91RM9200 OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
/*
* basic lifecycle operations
*/
.start = ohci_at91_start,
.stop = ohci_stop,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ohci_get_frame,
/*
* root hub support
*/
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
#ifdef CONFIG_PM
.hub_suspend = ohci_hub_suspend,
.hub_resume = ohci_hub_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
/*-------------------------------------------------------------------------*/
static int ohci_hcd_at91_drv_probe(struct platform_device *dev)
{
return usb_hcd_at91_probe(&ohci_at91_hc_driver, dev);
}
static int ohci_hcd_at91_drv_remove(struct platform_device *dev)
{
return usb_hcd_at91_remove(platform_get_drvdata(dev), dev);
}
#ifdef CONFIG_PM
static int ohci_hcd_at91_drv_suspend(struct platform_device *dev, u32 state, u32 level)
{
printk("%s(%s:%d): not implemented yet\n",
__func__, __FILE__, __LINE__);
clk_disable(fclk);
return 0;
}
static int ohci_hcd_at91_drv_resume(struct platform_device *dev, u32 state)
{
printk("%s(%s:%d): not implemented yet\n",
__func__, __FILE__, __LINE__);
clk_enable(fclk);
return 0;
}
#else
#define ohci_hcd_at91_drv_suspend NULL
#define ohci_hcd_at91_drv_resume NULL
#endif
static struct platform_driver ohci_hcd_at91_driver = {
.probe = ohci_hcd_at91_drv_probe,
.remove = ohci_hcd_at91_drv_remove,
.suspend = ohci_hcd_at91_drv_suspend,
.resume = ohci_hcd_at91_drv_resume,
.driver = {
.name = "at91rm9200-ohci",
.owner = THIS_MODULE,
},
};
static int __init ohci_hcd_at91_init (void)
{
if (usb_disabled())
return -ENODEV;
return platform_driver_register(&ohci_hcd_at91_driver);
}
static void __exit ohci_hcd_at91_cleanup (void)
{
platform_driver_unregister(&ohci_hcd_at91_driver);
}
module_init (ohci_hcd_at91_init);
module_exit (ohci_hcd_at91_cleanup);
