155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
/*
|
|
* linux/arch/arm/mach-w90x900/gpio.c
|
|
*
|
|
* Generic nuc900 GPIO handling
|
|
*
|
|
* Wan ZongShun <mcuos.com@gmail.com>
|
|
*
|
|
* 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);
|
|
}
|
|
}
|