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Commit cbfb3ea7 authored by Huacai Chen's avatar Huacai Chen Committed by Linus Walleij
Browse files

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



Improve Loongson-2's GPIO driver to support Loongson-3A/3B, and update
Loongson-3's default config file.

Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarHuacai Chen <chenhc@lemote.com>
Reviewed-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 991ff4e3

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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.

arch/mips/configs/loongson3_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpio/Kconfig

+3 −3
Original line number Diff line number Diff line
@@ -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

drivers/gpio/gpio-loongson.c

+27 −17
Original line number Diff line number Diff line 
/*

 *  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);