132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/*
|
|
* arch/arm/plat-iop/gpio.c
|
|
* GPIO handling for Intel IOP3xx processors.
|
|
*
|
|
* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/export.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/io.h>
|
|
|
|
#define IOP3XX_N_GPIOS 8
|
|
|
|
#define GPIO_IN 0
|
|
#define GPIO_OUT 1
|
|
#define GPIO_LOW 0
|
|
#define GPIO_HIGH 1
|
|
|
|
/* Memory base offset */
|
|
static void __iomem *base;
|
|
|
|
#define IOP3XX_GPIO_REG(reg) (base + (reg))
|
|
#define IOP3XX_GPOE IOP3XX_GPIO_REG(0x0000)
|
|
#define IOP3XX_GPID IOP3XX_GPIO_REG(0x0004)
|
|
#define IOP3XX_GPOD IOP3XX_GPIO_REG(0x0008)
|
|
|
|
static void gpio_line_config(int line, int direction)
|
|
{
|
|
unsigned long flags;
|
|
u32 val;
|
|
|
|
local_irq_save(flags);
|
|
val = readl(IOP3XX_GPOE);
|
|
if (direction == GPIO_IN) {
|
|
val |= BIT(line);
|
|
} else if (direction == GPIO_OUT) {
|
|
val &= ~BIT(line);
|
|
}
|
|
writel(val, IOP3XX_GPOE);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int gpio_line_get(int line)
|
|
{
|
|
return !!(readl(IOP3XX_GPID) & BIT(line));
|
|
}
|
|
|
|
static void gpio_line_set(int line, int value)
|
|
{
|
|
unsigned long flags;
|
|
u32 val;
|
|
|
|
local_irq_save(flags);
|
|
val = readl(IOP3XX_GPOD);
|
|
if (value == GPIO_LOW) {
|
|
val &= ~BIT(line);
|
|
} else if (value == GPIO_HIGH) {
|
|
val |= BIT(line);
|
|
}
|
|
writel(val, IOP3XX_GPOD);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
gpio_line_config(gpio, GPIO_IN);
|
|
return 0;
|
|
}
|
|
|
|
static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
|
|
{
|
|
gpio_line_set(gpio, level);
|
|
gpio_line_config(gpio, GPIO_OUT);
|
|
return 0;
|
|
}
|
|
|
|
static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
return gpio_line_get(gpio);
|
|
}
|
|
|
|
static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
|
|
{
|
|
gpio_line_set(gpio, value);
|
|
}
|
|
|
|
static struct gpio_chip iop3xx_chip = {
|
|
.label = "iop3xx",
|
|
.direction_input = iop3xx_gpio_direction_input,
|
|
.get = iop3xx_gpio_get_value,
|
|
.direction_output = iop3xx_gpio_direction_output,
|
|
.set = iop3xx_gpio_set_value,
|
|
.base = 0,
|
|
.ngpio = IOP3XX_N_GPIOS,
|
|
};
|
|
|
|
static int iop3xx_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
return gpiochip_add_data(&iop3xx_chip, NULL);
|
|
}
|
|
|
|
static struct platform_driver iop3xx_gpio_driver = {
|
|
.driver = {
|
|
.name = "gpio-iop",
|
|
},
|
|
.probe = iop3xx_gpio_probe,
|
|
};
|
|
|
|
static int __init iop3xx_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&iop3xx_gpio_driver);
|
|
}
|
|
arch_initcall(iop3xx_gpio_init);
|