- 根目录:
- drivers
- usb
- host
- ohci-da8xx.c
/*
* OHCI HCD (Host Controller Driver) for USB.
*
* TI DA8xx (OMAP-L1x) Bus Glue
*
* Derived from: ohci-omap.c and ohci-s3c2410.c
* Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <mach/da8xx.h>
#include <mach/usb.h>
#ifndef CONFIG_ARCH_DAVINCI_DA8XX
#error "This file is DA8xx bus glue. Define CONFIG_ARCH_DAVINCI_DA8XX."
#endif
#define CFGCHIP2 DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG)
static struct clk *usb11_clk;
static struct clk *usb20_clk;
/* Over-current indicator change bitmask */
static volatile u16 ocic_mask;
static void ohci_da8xx_clock(int on)
{
u32 cfgchip2;
cfgchip2 = __raw_readl(CFGCHIP2);
if (on) {
clk_enable(usb11_clk);
/*
* If USB 1.1 reference clock is sourced from USB 2.0 PHY, we
* need to enable the USB 2.0 module clocking, start its PHY,
* and not allow it to stop the clock during USB 2.0 suspend.
*/
if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX)) {
clk_enable(usb20_clk);
cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
cfgchip2 |= CFGCHIP2_PHY_PLLON;
__raw_writel(cfgchip2, CFGCHIP2);
pr_info("Waiting for USB PHY clock good...\n");
while (!(__raw_readl(CFGCHIP2) & CFGCHIP2_PHYCLKGD))
cpu_relax();
}
/* Enable USB 1.1 PHY */
cfgchip2 |= CFGCHIP2_USB1SUSPENDM;
} else {
clk_disable(usb11_clk);
if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX))
clk_disable(usb20_clk);
/* Disable USB 1.1 PHY */
cfgchip2 &= ~CFGCHIP2_USB1SUSPENDM;
}
__raw_writel(cfgchip2, CFGCHIP2);
}
/*
* Handle the port over-current indicator change.
*/
static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
unsigned port)
{
ocic_mask |= 1 << port;
/* Once over-current is detected, the port needs to be powered down */
if (hub->get_oci(port) > 0)
hub->set_power(port, 0);
}
static int ohci_da8xx_init(struct usb_hcd *hcd)
{
struct device *dev = hcd->self.controller;
struct da8xx_ohci_root_hub *hub = dev->platform_data;
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int result;
u32 rh_a;
dev_dbg(dev, "starting USB controller\n");
ohci_da8xx_clock(1);
/*
* DA8xx only have 1 port connected to the pins but the HC root hub
* register A reports 2 ports, thus we'll have to override it...
*/
ohci->num_ports = 1;
result = ohci_init(ohci);
if (result < 0)
return result;
/*
* Since we're providing a board-specific root hub port power control
* and over-current reporting, we have to override the HC root hub A
* register's default value, so that ohci_hub_control() could return
* the correct hub descriptor...
*/
rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
if (hub->set_power) {
rh_a &= ~RH_A_NPS;
rh_a |= RH_A_PSM;
}
if (hub->get_oci) {
rh_a &= ~RH_A_NOCP;
rh_a |= RH_A_OCPM;
}
rh_a &= ~RH_A_POTPGT;
rh_a |= hub->potpgt << 24;
ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
return result;
}
static void ohci_da8xx_stop(struct usb_hcd *hcd)
{
ohci_stop(hcd);
ohci_da8xx_clock(0);
}
static int ohci_da8xx_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int result;
result = ohci_run(ohci);
if (result < 0)
ohci_da8xx_stop(hcd);
return result;
}
/*
* Update the status data from the hub with the over-current indicator change.
*/
static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
{
int length = ohci_hub_status_data(hcd, buf);
/* See if we have OCIC bit set on port 1 */
if (ocic_mask & (1 << 1)) {
dev_dbg(hcd->self.controller, "over-current indicator change "
"on port 1\n");
if (!length)
length = 1;
buf[0] |= 1 << 1;
}
return length;
}
/*
* Look at the control requests to the root hub and see if we need to override.
*/
static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wIndex, char *buf, u16 wLength)
{
struct device *dev = hcd->self.controller;
struct da8xx_ohci_root_hub *hub = dev->platform_data;
int temp;
switch (typeReq) {
case GetPortStatus:
/* Check the port number */
if (wIndex != 1)
break;
dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
/* The port power status (PPS) bit defaults to 1 */
if (hub->get_power && hub->get_power(wIndex) == 0)
temp &= ~RH_PS_PPS;
/* The port over-current indicator (POCI) bit is always 0 */
if (hub->get_oci && hub->get_oci(wIndex) > 0)
temp |= RH_PS_POCI;
/* The over-current indicator change (OCIC) bit is 0 too */
if (ocic_mask & (1 << wIndex))
temp |= RH_PS_OCIC;
put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
return 0;
case SetPortFeature:
temp = 1;
goto check_port;
case ClearPortFeature:
temp = 0;
check_port:
/* Check the port number */
if (wIndex != 1)
break;
switch (wValue) {
case USB_PORT_FEAT_POWER:
dev_dbg(dev, "%sPortFeature(%u): %s\n",
temp ? "Set" : "Clear", wIndex, "POWER");
if (!hub->set_power)
return -EPIPE;
return hub->set_power(wIndex, temp) ? -EPIPE : 0;
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(dev, "%sPortFeature(%u): %s\n",
temp ? "Set" : "Clear", wIndex,
"C_OVER_CURRENT");
if (temp)
ocic_mask |= 1 << wIndex;
else
ocic_mask &= ~(1 << wIndex);
return 0;
}
}
return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
}
static const struct hc_driver ohci_da8xx_hc_driver = {
.description = hcd_name,
.product_desc = "DA8xx OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
/*
* basic lifecycle operations
*/
.reset = ohci_da8xx_init,
.start = ohci_da8xx_start,
.stop = ohci_da8xx_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_da8xx_hub_status_data,
.hub_control = ohci_da8xx_hub_control,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
/*-------------------------------------------------------------------------*/
/**
* usb_hcd_da8xx_probe - initialize DA8xx-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_da8xx_probe(const struct hc_driver *driver,
struct platform_device *pdev)
{
struct da8xx_ohci_root_hub *hub = pdev->dev.platform_data;
struct usb_hcd *hcd;
struct resource *mem;
int error, irq;
if (hub == NULL)
return -ENODEV;
usb11_clk = clk_get(&pdev->dev, "usb11");
if (IS_ERR(usb11_clk))
return PTR_ERR(usb11_clk);
usb20_clk = clk_get(&pdev->dev, "usb20");
if (IS_ERR(usb20_clk)) {
error = PTR_ERR(usb20_clk);
goto err0;
}
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
error = -ENOMEM;
goto err1;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
error = -ENODEV;
goto err2;
}
hcd->rsrc_start = mem->start;
hcd->rsrc_len = resource_size(mem);
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
dev_dbg(&pdev->dev, "request_mem_region failed\n");
error = -EBUSY;
goto err2;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
dev_err(&pdev->dev, "ioremap failed\n");
error = -ENOMEM;
goto err3;
}
ohci_hcd_init(hcd_to_ohci(hcd));
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
error = -ENODEV;
goto err4;
}
error = usb_add_hcd(hcd, irq, 0);
if (error)
goto err4;
if (hub->ocic_notify) {
error = hub->ocic_notify(ohci_da8xx_ocic_handler);
if (!error)
return 0;
}
usb_remove_hcd(hcd);
err4:
iounmap(hcd->regs);
err3:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err2:
usb_put_hcd(hcd);
err1:
clk_put(usb20_clk);
err0:
clk_put(usb11_clk);
return error;
}
/**
* usb_hcd_da8xx_remove - shutdown processing for DA8xx-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_hcd_da8xx_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*/
static inline void
usb_hcd_da8xx_remove(struct usb_hcd *hcd, struct platform_device *pdev)
{
struct da8xx_ohci_root_hub *hub = pdev->dev.platform_data;
hub->ocic_notify(NULL);
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
clk_put(usb20_clk);
clk_put(usb11_clk);
}
static int ohci_hcd_da8xx_drv_probe(struct platform_device *dev)
{
return usb_hcd_da8xx_probe(&ohci_da8xx_hc_driver, dev);
}
static int ohci_hcd_da8xx_drv_remove(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
usb_hcd_da8xx_remove(hcd, dev);
platform_set_drvdata(dev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int ohci_da8xx_suspend(struct platform_device *dev, pm_message_t message)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
ohci_da8xx_clock(0);
hcd->state = HC_STATE_SUSPENDED;
dev->dev.power.power_state = PMSG_SUSPEND;
return 0;
}
static int ohci_da8xx_resume(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
ohci_da8xx_clock(1);
dev->dev.power.power_state = PMSG_ON;
usb_hcd_resume_root_hub(hcd);
return 0;
}
#endif
/*
* Driver definition to register with platform structure.
*/
static struct platform_driver ohci_hcd_da8xx_driver = {
.probe = ohci_hcd_da8xx_drv_probe,
.remove = ohci_hcd_da8xx_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
.suspend = ohci_da8xx_suspend,
.resume = ohci_da8xx_resume,
#endif
.driver = {
.owner = THIS_MODULE,
.name = "ohci",
},
};