371 lines
8.2 KiB
C
371 lines
8.2 KiB
C
/*
|
|
* OHCI HCD (Host Controller Driver) for USB.
|
|
*
|
|
* Copyright (C) 2004 SAN People (Pty) Ltd.
|
|
* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
|
|
*
|
|
* AT91 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 <mach/hardware.h>
|
|
#include <asm/gpio.h>
|
|
|
|
#include <mach/board.h>
|
|
#include <mach/cpu.h>
|
|
|
|
#ifndef CONFIG_ARCH_AT91
|
|
#error "CONFIG_ARCH_AT91 must be defined."
|
|
#endif
|
|
|
|
/* interface and function clocks; sometimes also an AHB clock */
|
|
static struct clk *iclk, *fclk, *hclk;
|
|
static int clocked;
|
|
|
|
extern int usb_disabled(void);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void at91_start_clock(void)
|
|
{
|
|
if (cpu_is_at91sam9261())
|
|
clk_enable(hclk);
|
|
clk_enable(iclk);
|
|
clk_enable(fclk);
|
|
clocked = 1;
|
|
}
|
|
|
|
static void at91_stop_clock(void)
|
|
{
|
|
clk_disable(fclk);
|
|
clk_disable(iclk);
|
|
if (cpu_is_at91sam9261())
|
|
clk_disable(hclk);
|
|
clocked = 0;
|
|
}
|
|
|
|
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, "start\n");
|
|
|
|
/*
|
|
* Start the USB clocks.
|
|
*/
|
|
at91_start_clock();
|
|
|
|
/*
|
|
* 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, "stop\n");
|
|
|
|
/*
|
|
* Put the USB host controller into reset.
|
|
*/
|
|
writel(0, ®s->control);
|
|
|
|
/*
|
|
* Stop the USB clocks.
|
|
*/
|
|
at91_stop_clock();
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void 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 AT91-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.
|
|
*/
|
|
static 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, "at91");
|
|
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");
|
|
if (cpu_is_at91sam9261())
|
|
hclk = clk_get(&pdev->dev, "hck0");
|
|
|
|
at91_start_hc(pdev);
|
|
ohci_hcd_init(hcd_to_ohci(hcd));
|
|
|
|
retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
|
|
if (retval == 0)
|
|
return retval;
|
|
|
|
/* Error handling */
|
|
at91_stop_hc(pdev);
|
|
|
|
if (cpu_is_at91sam9261())
|
|
clk_put(hclk);
|
|
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 with controller, bus, and devices active */
|
|
|
|
/**
|
|
* usb_hcd_at91_remove - shutdown processing for AT91-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, "rmmod" or something similar.
|
|
*
|
|
*/
|
|
static void 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);
|
|
usb_put_hcd(hcd);
|
|
|
|
if (cpu_is_at91sam9261())
|
|
clk_put(hclk);
|
|
clk_put(fclk);
|
|
clk_put(iclk);
|
|
fclk = iclk = hclk = NULL;
|
|
|
|
dev_set_drvdata(&pdev->dev, NULL);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int __devinit
|
|
ohci_at91_start (struct usb_hcd *hcd)
|
|
{
|
|
struct at91_usbh_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;
|
|
|
|
ohci->num_ports = board->ports;
|
|
|
|
if ((ret = ohci_run(ohci)) < 0) {
|
|
err("can't start %s", hcd->self.bus_name);
|
|
ohci_stop(hcd);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static const struct hc_driver ohci_at91_hc_driver = {
|
|
.description = hcd_name,
|
|
.product_desc = "AT91 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,
|
|
.shutdown = ohci_shutdown,
|
|
|
|
/*
|
|
* 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
|
|
.bus_suspend = ohci_bus_suspend,
|
|
.bus_resume = ohci_bus_resume,
|
|
#endif
|
|
.start_port_reset = ohci_start_port_reset,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
|
|
{
|
|
struct at91_usbh_data *pdata = pdev->dev.platform_data;
|
|
int i;
|
|
|
|
if (pdata) {
|
|
/* REVISIT make the driver support per-port power switching,
|
|
* and also overcurrent detection. Here we assume the ports
|
|
* are always powered while this driver is active, and use
|
|
* active-low power switches.
|
|
*/
|
|
for (i = 0; i < pdata->ports; i++) {
|
|
if (pdata->vbus_pin[i] <= 0)
|
|
continue;
|
|
gpio_request(pdata->vbus_pin[i], "ohci_vbus");
|
|
gpio_direction_output(pdata->vbus_pin[i], 0);
|
|
}
|
|
}
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
|
|
}
|
|
|
|
static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
|
|
{
|
|
struct at91_usbh_data *pdata = pdev->dev.platform_data;
|
|
int i;
|
|
|
|
if (pdata) {
|
|
for (i = 0; i < pdata->ports; i++) {
|
|
if (pdata->vbus_pin[i] <= 0)
|
|
continue;
|
|
gpio_direction_output(pdata->vbus_pin[i], 1);
|
|
gpio_free(pdata->vbus_pin[i]);
|
|
}
|
|
}
|
|
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int
|
|
ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
|
|
{
|
|
struct usb_hcd *hcd = platform_get_drvdata(pdev);
|
|
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
|
|
|
|
if (device_may_wakeup(&pdev->dev))
|
|
enable_irq_wake(hcd->irq);
|
|
|
|
/*
|
|
* The integrated transceivers seem unable to notice disconnect,
|
|
* reconnect, or wakeup without the 48 MHz clock active. so for
|
|
* correctness, always discard connection state (using reset).
|
|
*
|
|
* REVISIT: some boards will be able to turn VBUS off...
|
|
*/
|
|
if (at91_suspend_entering_slow_clock()) {
|
|
ohci_usb_reset (ohci);
|
|
at91_stop_clock();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
|
|
{
|
|
struct usb_hcd *hcd = platform_get_drvdata(pdev);
|
|
|
|
if (device_may_wakeup(&pdev->dev))
|
|
disable_irq_wake(hcd->irq);
|
|
|
|
if (!clocked)
|
|
at91_start_clock();
|
|
|
|
ohci_finish_controller_resume(hcd);
|
|
return 0;
|
|
}
|
|
#else
|
|
#define ohci_hcd_at91_drv_suspend NULL
|
|
#define ohci_hcd_at91_drv_resume NULL
|
|
#endif
|
|
|
|
MODULE_ALIAS("platform:at91_ohci");
|
|
|
|
static struct platform_driver ohci_hcd_at91_driver = {
|
|
.probe = ohci_hcd_at91_drv_probe,
|
|
.remove = ohci_hcd_at91_drv_remove,
|
|
.shutdown = usb_hcd_platform_shutdown,
|
|
.suspend = ohci_hcd_at91_drv_suspend,
|
|
.resume = ohci_hcd_at91_drv_resume,
|
|
.driver = {
|
|
.name = "at91_ohci",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|