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linux-next/drivers/usb/host/ehci-omap.c
Keshava Munegowda 1fcb57d0f6 ARM: OMAP3: USB: Fix the EHCI ULPI PHY reset issue 
It is observed that the echi ports of 3430 sdp board
are not working due to the random timing of programming
the associated GPIOs of the ULPI PHYs of the EHCI for reset.
If the PHYs are reset at during usbhs core driver, host ports will
not work because EHCI driver is loaded after the resetting PHYs.
The PHYs should be in reset state while initializing the EHCI
controller.
The code which does the GPIO pins associated with the PHYs
are programmed to reset is moved from the USB host core driver
to EHCI driver.

Signed-off-by: Keshava Munegowda <keshava_mgowda@ti.com>
Reviewed-by: Partha Basak <parthab@india.ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Tested-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-04-16 18:47:00 +02:00

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/*
* 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 <plat/usb.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/gpio.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 platform_device *pdev, u8 port)
{
struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
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(&pdev->dev, "phy reset operation timed out\n");
break;
}
}
}
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;
struct ehci_hcd *omap_ehci;
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]);
}
}
if (pdata->phy_reset) {
if (gpio_is_valid(pdata->reset_gpio_port[0]))
gpio_request_one(pdata->reset_gpio_port[0],
GPIOF_OUT_INIT_LOW, "USB1 PHY reset");
if (gpio_is_valid(pdata->reset_gpio_port[1]))
gpio_request_one(pdata->reset_gpio_port[1],
GPIOF_OUT_INIT_LOW, "USB2 PHY reset");
/* Hold the PHY in RESET for enough time till DIR is high */
udelay(10);
}
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);
/* 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(pdev, 0);
if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY)
omap_ehci_soft_phy_reset(pdev, 1);
omap_ehci = hcd_to_ehci(hcd);
omap_ehci->sbrn = 0x20;
/* we know this is the memory we want, no need to ioremap again */
omap_ehci->caps = hcd->regs;
omap_ehci->regs = hcd->regs
+ HC_LENGTH(ehci, readl(&omap_ehci->caps->hc_capbase));
dbg_hcs_params(omap_ehci, "reset");
dbg_hcc_params(omap_ehci, "reset");
/* cache this readonly data; minimize chip reads */
omap_ehci->hcs_params = readl(&omap_ehci->caps->hcs_params);
ehci_reset(omap_ehci);
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (ret) {
dev_err(dev, "failed to add hcd with err %d\n", ret);
goto err_add_hcd;
}
/* root ports should always stay powered */
ehci_port_power(omap_ehci, 1);
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(pdata->reset_gpio_port[0], 1);
if (gpio_is_valid(pdata->reset_gpio_port[1]))
gpio_set_value(pdata->reset_gpio_port[1], 1);
}
return 0;
err_add_hcd:
disable_put_regulator(pdata);
pm_runtime_put_sync(dev);
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 = 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>");
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