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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 <linux/err.h>
#include <driver.h>
#include <init.h>
#include <usb/usb.h>
#include <usb/usb_defs.h>
#include <usb/ehci.h>
#include <errno.h>
#include <io.h>
#include "ehci.h"
struct atmel_ehci_priv {
struct ehci_host *ehci;
struct device_d *dev;
struct clk *iclk;
struct clk *uclk;
};
static int atmel_start_clock(struct atmel_ehci_priv *atehci)
{
int ret;
ret = clk_enable(atehci->iclk);
if (ret < 0) {
dev_err(atehci->dev,
"Error enabling interface clock\n");
return ret;
}
ret = clk_enable(atehci->uclk);
if (ret < 0)
dev_err(atehci->dev,
"Error enabling function clock\n");
return ret;
}
static void atmel_stop_clock(struct atmel_ehci_priv *atehci)
{
clk_disable(atehci->iclk);
clk_disable(atehci->uclk);
}
static int atmel_ehci_detect(struct device_d *dev)
{
struct atmel_ehci_priv *atehci = dev->priv;
return ehci_detect(atehci->ehci);
}
static int atmel_ehci_probe(struct device_d *dev)
{
int ret;
struct resource *iores;
struct ehci_data data;
struct atmel_ehci_priv *atehci;
const char *uclk_name;
struct ehci_host *ehci;
uclk_name = (dev->device_node) ? "usb_clk" : "uhpck";
atehci = xzalloc(sizeof(*atehci));
atehci->dev = dev;
dev->priv = atehci;
dev->detect = atmel_ehci_detect;
atehci->iclk = clk_get(dev, "ehci_clk");
if (IS_ERR(atehci->iclk)) {
dev_err(dev, "Error getting interface clock\n");
return -ENOENT;
}
atehci->uclk = clk_get(dev, uclk_name);
if (IS_ERR(atehci->iclk)) {
dev_err(dev, "Error getting function clock\n");
return -ENOENT;
}
/*
* Start the USB clocks.
*/
ret = atmel_start_clock(atehci);
if (ret < 0)
return ret;
memset(&data, 0, sizeof(data));
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
data.hccr = IOMEM(iores->start);
ehci = ehci_register(dev, &data);
if (IS_ERR(ehci))
return PTR_ERR(ehci);
atehci->ehci = ehci;
return 0;
}
static void atmel_ehci_remove(struct device_d *dev)
{
struct atmel_ehci_priv *atehci = dev->priv;
ehci_unregister(atehci->ehci);
/*
* Stop the USB clocks.
*/
atmel_stop_clock(atehci);
}
static const struct of_device_id atmel_ehci_dt_ids[] = {
{ .compatible = "atmel,at91sam9g45-ehci" },
{ /* sentinel */ }
};
static struct driver_d atmel_ehci_driver = {
.name = "atmel-ehci",
.probe = atmel_ehci_probe,
.remove = atmel_ehci_remove,
.of_compatible = DRV_OF_COMPAT(atmel_ehci_dt_ids),
};
device_platform_driver(atmel_ehci_driver);
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