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/*
* (C) Copyright 2010 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <io.h>
#include "ohci.h"
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(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;
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(NULL, "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(NULL, "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 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);
}
static struct driver_d at91_ohci_driver = {
.name = "at91_ohci",
.probe = at91_ohci_probe,
.remove = at91_ohci_remove,
};
device_platform_driver(at91_ohci_driver);
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