- 根目录:
- drivers
- usb
- host
- ehci-pmcmsp.c
/*
* PMC MSP EHCI (Host Controller Driver) for USB.
*
* (C) Copyright 2006-2010 PMC-Sierra Inc
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
*/
/* includes */
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/usb.h>
#include <msp_usb.h>
/* stream disable*/
#define USB_CTRL_MODE_STREAM_DISABLE 0x10
/* threshold */
#define USB_CTRL_FIFO_THRESH 0x00300000
/* register offset for usb_mode */
#define USB_EHCI_REG_USB_MODE 0x68
/* register offset for usb fifo */
#define USB_EHCI_REG_USB_FIFO 0x24
/* register offset for usb status */
#define USB_EHCI_REG_USB_STATUS 0x44
/* serial/parallel transceiver */
#define USB_EHCI_REG_BIT_STAT_STS (1<<29)
/* TWI USB0 host device pin */
#define MSP_PIN_USB0_HOST_DEV 49
/* TWI USB1 host device pin */
#define MSP_PIN_USB1_HOST_DEV 50
static void usb_hcd_tdi_set_mode(struct ehci_hcd *ehci)
{
u8 *base;
u8 *statreg;
u8 *fiforeg;
u32 val;
struct ehci_regs *reg_base = ehci->regs;
/* get register base */
base = (u8 *)reg_base + USB_EHCI_REG_USB_MODE;
statreg = (u8 *)reg_base + USB_EHCI_REG_USB_STATUS;
fiforeg = (u8 *)reg_base + USB_EHCI_REG_USB_FIFO;
/* Disable controller mode stream */
val = ehci_readl(ehci, (u32 *)base);
ehci_writel(ehci, (val | USB_CTRL_MODE_STREAM_DISABLE),
(u32 *)base);
/* clear STS to select parallel transceiver interface */
val = ehci_readl(ehci, (u32 *)statreg);
val = val & ~USB_EHCI_REG_BIT_STAT_STS;
ehci_writel(ehci, val, (u32 *)statreg);
/* write to set the proper fifo threshold */
ehci_writel(ehci, USB_CTRL_FIFO_THRESH, (u32 *)fiforeg);
/* set TWI GPIO USB_HOST_DEV pin high */
gpio_direction_output(MSP_PIN_USB0_HOST_DEV, 1);
#ifdef CONFIG_MSP_HAS_DUAL_USB
gpio_direction_output(MSP_PIN_USB1_HOST_DEV, 1);
#endif
}
/* called during probe() after chip reset completes */
static int ehci_msp_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int retval;
ehci->big_endian_mmio = 1;
ehci->big_endian_desc = 1;
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");
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
hcd->has_tt = 1;
retval = ehci_halt(ehci);
if (retval)
return retval;
ehci_reset(ehci);
/* data structure init */
retval = ehci_init(hcd);
if (retval)
return retval;
usb_hcd_tdi_set_mode(ehci);
ehci_port_power(ehci, 0);
return retval;
}
/* configure so an HC device and id are always provided
* always called with process context; sleeping is OK
*/
static int usb_hcd_msp_map_regs(struct mspusb_device *dev)
{
struct resource *res;
struct platform_device *pdev = &dev->dev;
u32 res_len;
int retval;
/* MAB register space */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (res == NULL)
return -ENOMEM;
res_len = resource_size(res);
if (!request_mem_region(res->start, res_len, "mab regs"))
return -EBUSY;
dev->mab_regs = ioremap_nocache(res->start, res_len);
if (dev->mab_regs == NULL) {
retval = -ENOMEM;
goto err1;
}
/* MSP USB register space */
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
if (res == NULL) {
retval = -ENOMEM;
goto err2;
}
res_len = resource_size(res);
if (!request_mem_region(res->start, res_len, "usbid regs")) {
retval = -EBUSY;
goto err2;
}
dev->usbid_regs = ioremap_nocache(res->start, res_len);
if (dev->usbid_regs == NULL) {
retval = -ENOMEM;
goto err3;
}
return 0;
err3:
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
res_len = resource_size(res);
release_mem_region(res->start, res_len);
err2:
iounmap(dev->mab_regs);
err1:
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
res_len = resource_size(res);
release_mem_region(res->start, res_len);
dev_err(&pdev->dev, "Failed to map non-EHCI regs.\n");
return retval;
}
/**
* usb_hcd_msp_probe - initialize PMC MSP-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.
*
*/
int usb_hcd_msp_probe(const struct hc_driver *driver,
struct platform_device *dev)
{
int retval;
struct usb_hcd *hcd;
struct resource *res;
struct ehci_hcd *ehci ;
hcd = usb_create_hcd(driver, &dev->dev, "pmcmsp");
if (!hcd)
return -ENOMEM;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (res == NULL) {
pr_debug("No IOMEM resource info for %s.\n", dev->name);
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, dev->name)) {
retval = -EBUSY;
goto err1;
}
hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
pr_debug("ioremap failed");
retval = -ENOMEM;
goto err2;
}
res = platform_get_resource(dev, IORESOURCE_IRQ, 0);
if (res == NULL) {
dev_err(&dev->dev, "No IRQ resource info for %s.\n", dev->name);
retval = -ENOMEM;
goto err3;
}
/* Map non-EHCI register spaces */
retval = usb_hcd_msp_map_regs(to_mspusb_device(dev));
if (retval != 0)
goto err3;
ehci = hcd_to_ehci(hcd);
ehci->big_endian_mmio = 1;
ehci->big_endian_desc = 1;
retval = usb_add_hcd(hcd, res->start, IRQF_SHARED);
if (retval == 0)
return 0;
usb_remove_hcd(hcd);
err3:
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
return retval;
}
/**
* usb_hcd_msp_remove - shutdown processing for PMC MSP-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_hcd_msp_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*
* may be called without controller electrically present
* may be called with controller, bus, and devices active
*/
void usb_hcd_msp_remove(struct usb_hcd *hcd, struct platform_device *dev)
{
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
}
#ifdef CONFIG_MSP_HAS_DUAL_USB
/*
* Wrapper around the main ehci_irq. Since both USB host controllers are
* sharing the same IRQ, need to first determine whether we're the intended
* recipient of this interrupt.
*/
static irqreturn_t ehci_msp_irq(struct usb_hcd *hcd)
{
u32 int_src;
struct device *dev = hcd->self.controller;
struct platform_device *pdev;
struct mspusb_device *mdev;
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
/* need to reverse-map a couple of containers to get our device */
pdev = to_platform_device(dev);
mdev = to_mspusb_device(pdev);
/* Check to see if this interrupt is for this host controller */
int_src = ehci_readl(ehci, &mdev->mab_regs->int_stat);
if (int_src & (1 << pdev->id))
return ehci_irq(hcd);
/* Not for this device */
return IRQ_NONE;
}
#endif /* DUAL_USB */
static const struct hc_driver ehci_msp_hc_driver = {
.description = hcd_name,
.product_desc = "PMC MSP EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
#ifdef CONFIG_MSP_HAS_DUAL_USB
.irq = ehci_msp_irq,
#else
.irq = ehci_irq,
#endif
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_msp_setup,
.start = ehci_run,
.shutdown = ehci_shutdown,
.start = ehci_run,
.stop = ehci_stop,
/*
* 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,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int ehci_hcd_msp_drv_probe(struct platform_device *pdev)
{
int ret;
pr_debug("In ehci_hcd_msp_drv_probe");
if (usb_disabled())
return -ENODEV;
gpio_request(MSP_PIN_USB0_HOST_DEV, "USB0_HOST_DEV_GPIO");
#ifdef CONFIG_MSP_HAS_DUAL_USB
gpio_request(MSP_PIN_USB1_HOST_DEV, "USB1_HOST_DEV_GPIO");
#endif
ret = usb_hcd_msp_probe(&ehci_msp_hc_driver, pdev);
return ret;
}
static int ehci_hcd_msp_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_hcd_msp_remove(hcd, pdev);
/* free TWI GPIO USB_HOST_DEV pin */
gpio_free(MSP_PIN_USB0_HOST_DEV);
#ifdef CONFIG_MSP_HAS_DUAL_USB
gpio_free(MSP_PIN_USB1_HOST_DEV);
#endif
return 0;
}
MODULE_ALIAS("pmcmsp-ehci");
static struct platform_driver ehci_hcd_msp_driver = {
.probe = ehci_hcd_msp_drv_probe,
.remove = ehci_hcd_msp_drv_remove,
.driver = {
.name = "pmcmsp-ehci",
.owner = THIS_MODULE,
},
};