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gpio: loongson: Add Loongson-3A/3B GPIO driver support

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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>
This commit is contained in:
Huacai Chen 2015-04-01 10:20:09 +08:00 committed by Linus Walleij
parent 991ff4e3d7
commit cbfb3ea7f8
4 changed files with 32 additions and 20 deletions
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1
arch/mips/Kconfig
View file

@ -1245,6 +1245,7 @@ config CPU_LOONGSON3
select CPU_SUPPORTS_HUGEPAGES
select WEAK_ORDERING
select WEAK_REORDERING_BEYOND_LLSC
select ARCH_REQUIRE_GPIOLIB
help
The Loongson 3 processor implements the MIPS64R2 instruction
set with many extensions.

1
arch/mips/configs/loongson3_defconfig
View file

@ -243,6 +243,7 @@ CONFIG_HW_RANDOM=y
CONFIG_RAW_DRIVER=m
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_PIIX4=y
CONFIG_GPIO_LOONGSON=y
CONFIG_SENSORS_LM75=m
CONFIG_SENSORS_LM93=m
CONFIG_SENSORS_W83627HF=m

6
drivers/gpio/Kconfig
View file

@ -509,10 +509,10 @@ config GPIO_GRGPIO
VHDL IP core library.
config GPIO_LOONGSON
bool "Loongson-2 GPIO support"
depends on CPU_LOONGSON2
bool "Loongson-2/3 GPIO support"
depends on CPU_LOONGSON2 || CPU_LOONGSON3
help
driver for GPIO functionality on Loongson-2F processors.
driver for GPIO functionality on Loongson-2F/3A/3B processors.
config GPIO_TB10X
bool

44
drivers/gpio/gpio-loongson.c
View file

@ -1,8 +1,10 @@
/*
* STLS2F GPIO Support
* 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
@ -20,11 +22,19 @@
#include <linux/gpio.h>
#define STLS2F_N_GPIO 4
#define STLS2F_GPIO_IN_OFFSET 16
#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 ls2f_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
u32 temp;
u32 mask;
@ -39,7 +49,7 @@ static int ls2f_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
return 0;
}
static int ls2f_gpio_direction_output(struct gpio_chip *chip,
static int loongson_gpio_direction_output(struct gpio_chip *chip,
unsigned gpio, int level)
{
u32 temp;
@ -56,12 +66,12 @@ static int ls2f_gpio_direction_output(struct gpio_chip *chip,
return 0;
}
static int ls2f_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
static int loongson_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
u32 val;
u32 mask;
mask = 1 << (gpio + STLS2F_GPIO_IN_OFFSET);
mask = 1 << (gpio + LOONGSON_GPIO_IN_OFFSET);
spin_lock(&gpio_lock);
val = LOONGSON_GPIODATA;
spin_unlock(&gpio_lock);
@ -69,7 +79,7 @@ static int ls2f_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
return (val & mask) != 0;
}
static void ls2f_gpio_set_value(struct gpio_chip *chip,
static void loongson_gpio_set_value(struct gpio_chip *chip,
unsigned gpio, int value)
{
u32 val;
@ -87,19 +97,19 @@ static void ls2f_gpio_set_value(struct gpio_chip *chip,
spin_unlock(&gpio_lock);
}
static struct gpio_chip ls2f_chip = {
.label = "ls2f",
.direction_input = ls2f_gpio_direction_input,
.get = ls2f_gpio_get_value,
.direction_output = ls2f_gpio_direction_output,
.set = ls2f_gpio_set_value,
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 = STLS2F_N_GPIO,
.ngpio = LOONGSON_N_GPIO,
.can_sleep = false,
};
static int __init ls2f_gpio_setup(void)
static int __init loongson_gpio_setup(void)
{
return gpiochip_add(&ls2f_chip);
return gpiochip_add(&loongson_chip);
}
arch_initcall(ls2f_gpio_setup);
postcore_initcall(loongson_gpio_setup);