cbfb3ea7f8
Improve Loongson-2's GPIO driver to support Loongson-3A/3B, and update Loongson-3's default config file. Acked-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Huacai Chen <chenhc@lemote.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
|
|
* Loongson-2F/3A/3B GPIO Support
|
|
*
|
|
* Copyright (c) 2008 Richard Liu, STMicroelectronics <richard.liu@st.com>
|
|
* Copyright (c) 2008-2010 Arnaud Patard <apatard@mandriva.com>
|
|
* Copyright (c) 2013 Hongbing Hu <huhb@lemote.com>
|
|
* Copyright (c) 2014 Huacai Chen <chenhc@lemote.com>
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/err.h>
|
|
#include <asm/types.h>
|
|
#include <loongson.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#define STLS2F_N_GPIO 4
|
|
#define STLS3A_N_GPIO 16
|
|
|
|
#ifdef CONFIG_CPU_LOONGSON3
|
|
#define LOONGSON_N_GPIO STLS3A_N_GPIO
|
|
#else
|
|
#define LOONGSON_N_GPIO STLS2F_N_GPIO
|
|
#endif
|
|
|
|
#define LOONGSON_GPIO_IN_OFFSET 16
|
|
|
|
static DEFINE_SPINLOCK(gpio_lock);
|
|
|
|
static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
u32 temp;
|
|
u32 mask;
|
|
|
|
spin_lock(&gpio_lock);
|
|
mask = 1 << gpio;
|
|
temp = LOONGSON_GPIOIE;
|
|
temp |= mask;
|
|
LOONGSON_GPIOIE = temp;
|
|
spin_unlock(&gpio_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int loongson_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned gpio, int level)
|
|
{
|
|
u32 temp;
|
|
u32 mask;
|
|
|
|
gpio_set_value(gpio, level);
|
|
spin_lock(&gpio_lock);
|
|
mask = 1 << gpio;
|
|
temp = LOONGSON_GPIOIE;
|
|
temp &= (~mask);
|
|
LOONGSON_GPIOIE = temp;
|
|
spin_unlock(&gpio_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int loongson_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
u32 val;
|
|
u32 mask;
|
|
|
|
mask = 1 << (gpio + LOONGSON_GPIO_IN_OFFSET);
|
|
spin_lock(&gpio_lock);
|
|
val = LOONGSON_GPIODATA;
|
|
spin_unlock(&gpio_lock);
|
|
|
|
return (val & mask) != 0;
|
|
}
|
|
|
|
static void loongson_gpio_set_value(struct gpio_chip *chip,
|
|
unsigned gpio, int value)
|
|
{
|
|
u32 val;
|
|
u32 mask;
|
|
|
|
mask = 1 << gpio;
|
|
|
|
spin_lock(&gpio_lock);
|
|
val = LOONGSON_GPIODATA;
|
|
if (value)
|
|
val |= mask;
|
|
else
|
|
val &= (~mask);
|
|
LOONGSON_GPIODATA = val;
|
|
spin_unlock(&gpio_lock);
|
|
}
|
|
|
|
static struct gpio_chip loongson_chip = {
|
|
.label = "Loongson-gpio-chip",
|
|
.direction_input = loongson_gpio_direction_input,
|
|
.get = loongson_gpio_get_value,
|
|
.direction_output = loongson_gpio_direction_output,
|
|
.set = loongson_gpio_set_value,
|
|
.base = 0,
|
|
.ngpio = LOONGSON_N_GPIO,
|
|
.can_sleep = false,
|
|
};
|
|
|
|
static int __init loongson_gpio_setup(void)
|
|
{
|
|
return gpiochip_add(&loongson_chip);
|
|
}
|
|
postcore_initcall(loongson_gpio_setup);
|