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/*
* (C) Copyright 2010 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* 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; version 2 of
* the License.
*
* 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.
*
*/
#include <common.h>
#include <linux/clk.h>
#include <driver.h>
#include <init.h>
#include <usb/usb.h>
#include <usb/usb_defs.h>
#include <errno.h>
#include <gpio.h>
#include <of_gpio.h>
#include <io.h>
#include <mach/board.h>
#include "ohci.h"
#define at91_for_each_port(index) \
for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
struct ohci_at91_priv {
struct device_d *dev;
struct clk *iclk;
struct clk *fclk;
struct ohci_regs __iomem *regs;
};
static int at91_start_clock(struct ohci_at91_priv *ohci_at91)
{
int ret;
ret = clk_enable(ohci_at91->iclk);
if (ret < 0) {
dev_err(ohci_at91->dev, "Failed to enable 'iclk'\n");
return ret;
}
ret = clk_enable(ohci_at91->fclk);
if (ret < 0) {
dev_err(ohci_at91->dev, "Failed to enable 'fclk'\n");
return ret;
}
return 0;
}
static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
{
clk_disable(ohci_at91->fclk);
clk_disable(ohci_at91->iclk);
}
static int at91_ohci_probe_dt(struct device_d *dev)
{
u32 ports;
int i, ret, gpio;
enum of_gpio_flags flags;
struct at91_usbh_data *pdata;
struct device_node *np = dev->device_node;
pdata = xzalloc(sizeof(*pdata));
dev->platform_data = pdata;
if (!of_property_read_u32(np, "num-ports", &ports)) {
pdata->ports = ports;
} else {
dev_err(dev, "Failed to read 'num-ports' property\n");
return -EINVAL;
}
at91_for_each_port(i) {
/*
* do not configure PIO if not in relation with
* real USB port on board
*/
if (i >= pdata->ports) {
pdata->vbus_pin[i] = -EINVAL;
continue;
}
gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i,
&flags);
pdata->vbus_pin[i] = gpio;
if (!gpio_is_valid(gpio))
continue;
pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
ret = gpio_request(gpio, "ohci_vbus");
if (ret) {
dev_err(dev, "can't request vbus gpio %d\n", gpio);
continue;
}
ret = gpio_direction_output(gpio,
!pdata->vbus_pin_active_low[i]);
if (ret) {
dev_err(dev, "can't put vbus gpio %d as output %d\n",
gpio, !pdata->vbus_pin_active_low[i]);
gpio_free(gpio);
continue;
}
}
return 0;
}
static int at91_ohci_probe(struct device_d *dev)
{
int ret;
struct resource *io;
struct ohci_at91_priv *ohci_at91 = xzalloc(sizeof(*ohci_at91));
dev->priv = ohci_at91;
ohci_at91->dev = dev;
if (dev->device_node) {
ret = at91_ohci_probe_dt(dev);
if (ret < 0)
return ret;
}
io = dev_get_resource(dev, IORESOURCE_MEM, 0);
if (IS_ERR(io)) {
dev_err(dev, "Failed to get IORESOURCE_MEM\n");
return PTR_ERR(io);
}
ohci_at91->regs = IOMEM(io->start);
ohci_at91->iclk = clk_get(dev, "ohci_clk");
if (IS_ERR(ohci_at91->iclk)) {
dev_err(dev, "Failed to get 'ohci_clk'\n");
return PTR_ERR(ohci_at91->iclk);
}
ohci_at91->fclk = clk_get(dev, "uhpck");
if (IS_ERR(ohci_at91->fclk)) {
dev_err(dev, "Failed to get 'uhpck'\n");
return PTR_ERR(ohci_at91->fclk);
}
/*
* Start the USB clocks.
*/
ret = at91_start_clock(ohci_at91);
if (ret < 0)
return ret;
/*
* The USB host controller must remain in reset.
*/
writel(0, &ohci_at91->regs->control);
add_generic_device("ohci", DEVICE_ID_DYNAMIC, NULL, io->start,
resource_size(io), IORESOURCE_MEM, NULL);
return 0;
}
static void at91_ohci_remove(struct device_d *dev)
{
struct at91_usbh_data *pdata = dev->platform_data;
struct ohci_at91_priv *ohci_at91 = dev->priv;
/*
* Put the USB host controller into reset.
*/
writel(0, &ohci_at91->regs->control);
/*
* Stop the USB clocks.
*/
at91_stop_clock(ohci_at91);
if (pdata) {
bool active_low;
int i, gpio;
at91_for_each_port(i) {
gpio = pdata->vbus_pin[i];
active_low = pdata->vbus_pin_active_low[i];
if (gpio_is_valid(gpio)) {
gpio_set_value(gpio, active_low);
gpio_free(gpio);
}
}
}
}
static const struct of_device_id at91_ohci_dt_ids[] = {
{ .compatible = "atmel,at91rm9200-ohci" },
{ /* sentinel */ }
};
static struct driver_d at91_ohci_driver = {
.name = "at91_ohci",
.probe = at91_ohci_probe,
.remove = at91_ohci_remove,
.of_compatible = DRV_OF_COMPAT(at91_ohci_dt_ids),
};
device_platform_driver(at91_ohci_driver);
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