379 lines
9.8 KiB
C
379 lines
9.8 KiB
C
/*
|
|
* ehci-omap.c - driver for USBHOST on OMAP3/4 processors
|
|
*
|
|
* Bus Glue for the EHCI controllers in OMAP3/4
|
|
* Tested on several OMAP3 boards, and OMAP4 Pandaboard
|
|
*
|
|
* Copyright (C) 2007-2011 Texas Instruments, Inc.
|
|
* Author: Vikram Pandita <vikram.pandita@ti.com>
|
|
* Author: Anand Gadiyar <gadiyar@ti.com>
|
|
* Author: Keshava Munegowda <keshava_mgowda@ti.com>
|
|
*
|
|
* Copyright (C) 2009 Nokia Corporation
|
|
* Contact: Felipe Balbi <felipe.balbi@nokia.com>
|
|
*
|
|
* Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* TODO (last updated Feb 27, 2010):
|
|
* - add kernel-doc
|
|
* - enable AUTOIDLE
|
|
* - add suspend/resume
|
|
* - add HSIC and TLL support
|
|
* - convert to use hwmod and runtime PM
|
|
*/
|
|
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/usb/ulpi.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/clk.h>
|
|
|
|
#include <linux/platform_data/usb-omap.h>
|
|
|
|
/* EHCI Register Set */
|
|
#define EHCI_INSNREG04 (0xA0)
|
|
#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
|
|
#define EHCI_INSNREG05_ULPI (0xA4)
|
|
#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
|
|
#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
|
|
#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
|
|
#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
|
|
#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
|
|
#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static const struct hc_driver ehci_omap_hc_driver;
|
|
|
|
|
|
static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
|
|
{
|
|
__raw_writel(val, base + reg);
|
|
}
|
|
|
|
static inline u32 ehci_read(void __iomem *base, u32 reg)
|
|
{
|
|
return __raw_readl(base + reg);
|
|
}
|
|
|
|
|
|
static void omap_ehci_soft_phy_reset(struct usb_hcd *hcd, u8 port)
|
|
{
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
|
|
unsigned reg = 0;
|
|
|
|
reg = ULPI_FUNC_CTRL_RESET
|
|
/* FUNCTION_CTRL_SET register */
|
|
| (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT)
|
|
/* Write */
|
|
| (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT)
|
|
/* PORTn */
|
|
| ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT)
|
|
/* start ULPI access*/
|
|
| (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT);
|
|
|
|
ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg);
|
|
|
|
/* Wait for ULPI access completion */
|
|
while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI)
|
|
& (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) {
|
|
cpu_relax();
|
|
|
|
if (time_after(jiffies, timeout)) {
|
|
dev_dbg(hcd->self.controller,
|
|
"phy reset operation timed out\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int omap_ehci_init(struct usb_hcd *hcd)
|
|
{
|
|
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
|
|
int rc;
|
|
struct ehci_hcd_omap_platform_data *pdata;
|
|
|
|
pdata = hcd->self.controller->platform_data;
|
|
|
|
/* Hold PHYs in reset while initializing EHCI controller */
|
|
if (pdata->phy_reset) {
|
|
if (gpio_is_valid(pdata->reset_gpio_port[0]))
|
|
gpio_set_value_cansleep(pdata->reset_gpio_port[0], 0);
|
|
|
|
if (gpio_is_valid(pdata->reset_gpio_port[1]))
|
|
gpio_set_value_cansleep(pdata->reset_gpio_port[1], 0);
|
|
|
|
/* Hold the PHY in RESET for enough time till DIR is high */
|
|
udelay(10);
|
|
}
|
|
|
|
/* Soft reset the PHY using PHY reset command over ULPI */
|
|
if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY)
|
|
omap_ehci_soft_phy_reset(hcd, 0);
|
|
if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY)
|
|
omap_ehci_soft_phy_reset(hcd, 1);
|
|
|
|
/* we know this is the memory we want, no need to ioremap again */
|
|
ehci->caps = hcd->regs;
|
|
|
|
rc = ehci_setup(hcd);
|
|
|
|
if (pdata->phy_reset) {
|
|
/* Hold the PHY in RESET for enough time till
|
|
* PHY is settled and ready
|
|
*/
|
|
udelay(10);
|
|
|
|
if (gpio_is_valid(pdata->reset_gpio_port[0]))
|
|
gpio_set_value_cansleep(pdata->reset_gpio_port[0], 1);
|
|
|
|
if (gpio_is_valid(pdata->reset_gpio_port[1]))
|
|
gpio_set_value_cansleep(pdata->reset_gpio_port[1], 1);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void disable_put_regulator(
|
|
struct ehci_hcd_omap_platform_data *pdata)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
|
|
if (pdata->regulator[i]) {
|
|
regulator_disable(pdata->regulator[i]);
|
|
regulator_put(pdata->regulator[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* configure so an HC device and id are always provided */
|
|
/* always called with process context; sleeping is OK */
|
|
|
|
/**
|
|
* ehci_hcd_omap_probe - initialize TI-based HCDs
|
|
*
|
|
* 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 ehci_hcd_omap_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct ehci_hcd_omap_platform_data *pdata = dev->platform_data;
|
|
struct resource *res;
|
|
struct usb_hcd *hcd;
|
|
void __iomem *regs;
|
|
int ret = -ENODEV;
|
|
int irq;
|
|
int i;
|
|
char supply[7];
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
if (!dev->parent) {
|
|
dev_err(dev, "Missing parent device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
irq = platform_get_irq_byname(pdev, "ehci-irq");
|
|
if (irq < 0) {
|
|
dev_err(dev, "EHCI irq failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
res = platform_get_resource_byname(pdev,
|
|
IORESOURCE_MEM, "ehci");
|
|
if (!res) {
|
|
dev_err(dev, "UHH EHCI get resource failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
regs = ioremap(res->start, resource_size(res));
|
|
if (!regs) {
|
|
dev_err(dev, "UHH EHCI ioremap failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
|
|
dev_name(dev));
|
|
if (!hcd) {
|
|
dev_err(dev, "failed to create hcd with err %d\n", ret);
|
|
ret = -ENOMEM;
|
|
goto err_io;
|
|
}
|
|
|
|
hcd->rsrc_start = res->start;
|
|
hcd->rsrc_len = resource_size(res);
|
|
hcd->regs = regs;
|
|
|
|
/* get ehci regulator and enable */
|
|
for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
|
|
if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) {
|
|
pdata->regulator[i] = NULL;
|
|
continue;
|
|
}
|
|
snprintf(supply, sizeof(supply), "hsusb%d", i);
|
|
pdata->regulator[i] = regulator_get(dev, supply);
|
|
if (IS_ERR(pdata->regulator[i])) {
|
|
pdata->regulator[i] = NULL;
|
|
dev_dbg(dev,
|
|
"failed to get ehci port%d regulator\n", i);
|
|
} else {
|
|
regulator_enable(pdata->regulator[i]);
|
|
}
|
|
}
|
|
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_get_sync(dev);
|
|
|
|
/*
|
|
* An undocumented "feature" in the OMAP3 EHCI controller,
|
|
* causes suspended ports to be taken out of suspend when
|
|
* the USBCMD.Run/Stop bit is cleared (for example when
|
|
* we do ehci_bus_suspend).
|
|
* This breaks suspend-resume if the root-hub is allowed
|
|
* to suspend. Writing 1 to this undocumented register bit
|
|
* disables this feature and restores normal behavior.
|
|
*/
|
|
ehci_write(regs, EHCI_INSNREG04,
|
|
EHCI_INSNREG04_DISABLE_UNSUSPEND);
|
|
|
|
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add hcd with err %d\n", ret);
|
|
goto err_pm_runtime;
|
|
}
|
|
|
|
|
|
return 0;
|
|
|
|
err_pm_runtime:
|
|
disable_put_regulator(pdata);
|
|
pm_runtime_put_sync(dev);
|
|
usb_put_hcd(hcd);
|
|
|
|
err_io:
|
|
iounmap(regs);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
|
|
* @pdev: USB Host Controller being removed
|
|
*
|
|
* Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
|
|
* the HCD's stop() method. It is always called from a thread
|
|
* context, normally "rmmod", "apmd", or something similar.
|
|
*/
|
|
static int ehci_hcd_omap_remove(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct ehci_hcd_omap_platform_data *pdata = dev->platform_data;
|
|
|
|
usb_remove_hcd(hcd);
|
|
disable_put_regulator(dev->platform_data);
|
|
iounmap(hcd->regs);
|
|
usb_put_hcd(hcd);
|
|
|
|
pm_runtime_put_sync(dev);
|
|
pm_runtime_disable(dev);
|
|
|
|
if (pdata->phy_reset) {
|
|
if (gpio_is_valid(pdata->reset_gpio_port[0]))
|
|
gpio_free(pdata->reset_gpio_port[0]);
|
|
|
|
if (gpio_is_valid(pdata->reset_gpio_port[1]))
|
|
gpio_free(pdata->reset_gpio_port[1]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
|
|
{
|
|
struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
|
|
|
|
if (hcd->driver->shutdown)
|
|
hcd->driver->shutdown(hcd);
|
|
}
|
|
|
|
static struct platform_driver ehci_hcd_omap_driver = {
|
|
.probe = ehci_hcd_omap_probe,
|
|
.remove = ehci_hcd_omap_remove,
|
|
.shutdown = ehci_hcd_omap_shutdown,
|
|
/*.suspend = ehci_hcd_omap_suspend, */
|
|
/*.resume = ehci_hcd_omap_resume, */
|
|
.driver = {
|
|
.name = "ehci-omap",
|
|
}
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static const struct hc_driver ehci_omap_hc_driver = {
|
|
.description = hcd_name,
|
|
.product_desc = "OMAP-EHCI Host Controller",
|
|
.hcd_priv_size = sizeof(struct ehci_hcd),
|
|
|
|
/*
|
|
* generic hardware linkage
|
|
*/
|
|
.irq = ehci_irq,
|
|
.flags = HCD_MEMORY | HCD_USB2,
|
|
|
|
/*
|
|
* basic lifecycle operations
|
|
*/
|
|
.reset = omap_ehci_init,
|
|
.start = ehci_run,
|
|
.stop = ehci_stop,
|
|
.shutdown = ehci_shutdown,
|
|
|
|
/*
|
|
* 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,
|
|
|
|
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
|
|
};
|
|
|
|
MODULE_ALIAS("platform:omap-ehci");
|
|
MODULE_AUTHOR("Texas Instruments, Inc.");
|
|
MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
|
|
|