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gpio.c
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/*
* linux/arch/arm/mach-w90x900/gpio.c
*
* Generic nuc900 GPIO handling
*
* Wan ZongShun <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <mach/hardware.h>
#define GPIO_BASE (W90X900_VA_GPIO)
#define GPIO_DIR (0x04)
#define GPIO_OUT (0x08)
#define GPIO_IN (0x0C)
#define GROUPINERV (0x10)
#define GPIO_GPIO(Nb) (0x00000001 << (Nb))
#define to_nuc900_gpio_chip(c) container_of(c, struct nuc900_gpio_chip, chip)
#define NUC900_GPIO_CHIP(name, base_gpio, nr_gpio) \
{ \
.chip = { \
.label = name, \
.direction_input = nuc900_dir_input, \
.direction_output = nuc900_dir_output, \
.get = nuc900_gpio_get, \
.set = nuc900_gpio_set, \
.base = base_gpio, \
.ngpio = nr_gpio, \
} \
}
struct nuc900_gpio_chip {
struct gpio_chip chip;
void __iomem *regbase; /* Base of group register*/
spinlock_t gpio_lock;
};
static int nuc900_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct nuc900_gpio_chip *nuc900_gpio = to_nuc900_gpio_chip(chip);
void __iomem *pio = nuc900_gpio->regbase + GPIO_IN;
unsigned int regval;
regval = __raw_readl(pio);
regval &= GPIO_GPIO(offset);
return (regval != 0);
}
static void nuc900_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
struct nuc900_gpio_chip *nuc900_gpio = to_nuc900_gpio_chip(chip);
void __iomem *pio = nuc900_gpio->regbase + GPIO_OUT;
unsigned int regval;
unsigned long flags;
spin_lock_irqsave(&nuc900_gpio->gpio_lock, flags);
regval = __raw_readl(pio);
if (val)
regval |= GPIO_GPIO(offset);
else
regval &= ~GPIO_GPIO(offset);
__raw_writel(regval, pio);
spin_unlock_irqrestore(&nuc900_gpio->gpio_lock, flags);
}
static int nuc900_dir_input(struct gpio_chip *chip, unsigned offset)
{
struct nuc900_gpio_chip *nuc900_gpio = to_nuc900_gpio_chip(chip);
void __iomem *pio = nuc900_gpio->regbase + GPIO_DIR;
unsigned int regval;
unsigned long flags;
spin_lock_irqsave(&nuc900_gpio->gpio_lock, flags);
regval = __raw_readl(pio);
regval &= ~GPIO_GPIO(offset);
__raw_writel(regval, pio);
spin_unlock_irqrestore(&nuc900_gpio->gpio_lock, flags);
return 0;
}
static int nuc900_dir_output(struct gpio_chip *chip, unsigned offset, int val)
{
struct nuc900_gpio_chip *nuc900_gpio = to_nuc900_gpio_chip(chip);
void __iomem *outreg = nuc900_gpio->regbase + GPIO_OUT;
void __iomem *pio = nuc900_gpio->regbase + GPIO_DIR;
unsigned int regval;
unsigned long flags;
spin_lock_irqsave(&nuc900_gpio->gpio_lock, flags);
regval = __raw_readl(pio);
regval |= GPIO_GPIO(offset);
__raw_writel(regval, pio);
regval = __raw_readl(outreg);
if (val)
regval |= GPIO_GPIO(offset);
else
regval &= ~GPIO_GPIO(offset);
__raw_writel(regval, outreg);
spin_unlock_irqrestore(&nuc900_gpio->gpio_lock, flags);
return 0;
}
static struct nuc900_gpio_chip nuc900_gpio[] = {
NUC900_GPIO_CHIP("GROUPC", 0, 16),
NUC900_GPIO_CHIP("GROUPD", 16, 10),
NUC900_GPIO_CHIP("GROUPE", 26, 14),
NUC900_GPIO_CHIP("GROUPF", 40, 10),
NUC900_GPIO_CHIP("GROUPG", 50, 17),
NUC900_GPIO_CHIP("GROUPH", 67, 8),
NUC900_GPIO_CHIP("GROUPI", 75, 17),
};
void __init nuc900_init_gpio(int nr_group)
{
unsigned i;
struct nuc900_gpio_chip *gpio_chip;
for (i = 0; i < nr_group; i++) {
gpio_chip = &nuc900_gpio[i];
spin_lock_init(&gpio_chip->gpio_lock);
gpio_chip->regbase = GPIO_BASE + i * GROUPINERV;
gpiochip_add(&gpio_chip->chip);
}
}