/*
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* Loongson-2F/3A/3B GPIO Support
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*
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* Copyright (c) 2008 Richard Liu, STMicroelectronics <richard.liu@st.com>
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* Copyright (c) 2008-2010 Arnaud Patard <apatard@mandriva.com>
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* Copyright (c) 2013 Hongbing Hu <huhb@lemote.com>
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* Copyright (c) 2014 Huacai Chen <chenhc@lemote.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/err.h>
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#include <asm/types.h>
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#include <loongson.h>
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#include <linux/gpio.h>
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#define STLS2F_N_GPIO 4
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#define STLS3A_N_GPIO 16
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#ifdef CONFIG_CPU_LOONGSON3
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#define LOONGSON_N_GPIO STLS3A_N_GPIO
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#else
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#define LOONGSON_N_GPIO STLS2F_N_GPIO
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#endif
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#define LOONGSON_GPIO_IN_OFFSET 16
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static DEFINE_SPINLOCK(gpio_lock);
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static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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u32 temp;
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u32 mask;
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spin_lock(&gpio_lock);
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mask = 1 << gpio;
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temp = LOONGSON_GPIOIE;
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temp |= mask;
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LOONGSON_GPIOIE = temp;
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spin_unlock(&gpio_lock);
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return 0;
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}
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static int loongson_gpio_direction_output(struct gpio_chip *chip,
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unsigned gpio, int level)
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{
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u32 temp;
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u32 mask;
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gpio_set_value(gpio, level);
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spin_lock(&gpio_lock);
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mask = 1 << gpio;
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temp = LOONGSON_GPIOIE;
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temp &= (~mask);
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LOONGSON_GPIOIE = temp;
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spin_unlock(&gpio_lock);
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return 0;
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}
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static int loongson_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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u32 val;
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u32 mask;
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mask = 1 << (gpio + LOONGSON_GPIO_IN_OFFSET);
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spin_lock(&gpio_lock);
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val = LOONGSON_GPIODATA;
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spin_unlock(&gpio_lock);
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return (val & mask) != 0;
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}
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static void loongson_gpio_set_value(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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u32 val;
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u32 mask;
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mask = 1 << gpio;
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spin_lock(&gpio_lock);
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val = LOONGSON_GPIODATA;
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if (value)
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val |= mask;
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else
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val &= (~mask);
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LOONGSON_GPIODATA = val;
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spin_unlock(&gpio_lock);
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}
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static struct gpio_chip loongson_chip = {
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.label = "Loongson-gpio-chip",
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.direction_input = loongson_gpio_direction_input,
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.get = loongson_gpio_get_value,
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.direction_output = loongson_gpio_direction_output,
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.set = loongson_gpio_set_value,
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.base = 0,
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.ngpio = LOONGSON_N_GPIO,
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.can_sleep = false,
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};
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static int __init loongson_gpio_setup(void)
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{
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return gpiochip_add_data(&loongson_chip, NULL);
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}
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postcore_initcall(loongson_gpio_setup);
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