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/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <mach/msm_iomap.h>
#include "gpiomux.h"
/* Bits of interest in the GPIO_IN_OUT register.
*/
enum {
GPIO_IN_BIT = 0,
GPIO_OUT_BIT = 1
};
/* Bits of interest in the GPIO_CFG register.
*/
enum {
GPIO_OE_BIT = 9,
};
#define GPIO_CONFIG(gpio) (MSM_TLMM_BASE + 0x1000 + (0x10 * (gpio)))
#define GPIO_IN_OUT(gpio) (MSM_TLMM_BASE + 0x1004 + (0x10 * (gpio)))
static DEFINE_SPINLOCK(tlmm_lock);
static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
{
return readl(GPIO_IN_OUT(offset)) & BIT(GPIO_IN_BIT);
}
static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
writel(val ? BIT(GPIO_OUT_BIT) : 0, GPIO_IN_OUT(offset));
}
static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
unsigned long irq_flags;
spin_lock_irqsave(&tlmm_lock, irq_flags);
writel(readl(GPIO_CONFIG(offset)) & ~BIT(GPIO_OE_BIT),
GPIO_CONFIG(offset));
spin_unlock_irqrestore(&tlmm_lock, irq_flags);
return 0;
}
static int msm_gpio_direction_output(struct gpio_chip *chip,
unsigned offset,
int val)
{
unsigned long irq_flags;
spin_lock_irqsave(&tlmm_lock, irq_flags);
msm_gpio_set(chip, offset, val);
writel(readl(GPIO_CONFIG(offset)) | BIT(GPIO_OE_BIT),
GPIO_CONFIG(offset));
spin_unlock_irqrestore(&tlmm_lock, irq_flags);
return 0;
}
static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
{
return msm_gpiomux_get(chip->base + offset);
}
static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
{
msm_gpiomux_put(chip->base + offset);
}
static struct gpio_chip msm_gpio = {
.base = 0,
.ngpio = NR_GPIO_IRQS,
.direction_input = msm_gpio_direction_input,
.direction_output = msm_gpio_direction_output,
.get = msm_gpio_get,
.set = msm_gpio_set,
.request = msm_gpio_request,
.free = msm_gpio_free,
};
static int __devinit msm_gpio_probe(struct platform_device *dev)
{
int ret;
msm_gpio.label = dev->name;
ret = gpiochip_add(&msm_gpio);
return ret;
}
static int __devexit msm_gpio_remove(struct platform_device *dev)
{
int ret = gpiochip_remove(&msm_gpio);
if (ret < 0)
return ret;
set_irq_handler(TLMM_SCSS_SUMMARY_IRQ, NULL);
return 0;
}
static struct platform_driver msm_gpio_driver = {
.probe = msm_gpio_probe,
.remove = __devexit_p(msm_gpio_remove),
.driver = {
.name = "msmgpio",
.owner = THIS_MODULE,
},
};
static struct platform_device msm_device_gpio = {
.name = "msmgpio",
.id = -1,
};
static int __init msm_gpio_init(void)
{
int rc;
rc = platform_driver_register(&msm_gpio_driver);
if (!rc) {
rc = platform_device_register(&msm_device_gpio);
if (rc)
platform_driver_unregister(&msm_gpio_driver);
}
return rc;
}
static void __exit msm_gpio_exit(void)
{
platform_device_unregister(&msm_device_gpio);
platform_driver_unregister(&msm_gpio_driver);
}
postcore_initcall(msm_gpio_init);
module_exit(msm_gpio_exit);
MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
MODULE_DESCRIPTION("Driver for Qualcomm MSM TLMMv2 SoC GPIOs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:msmgpio");
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