diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/Kconfig | 2 | ||||
| -rw-r--r-- | arch/mips/include/asm/mach-loongson/gpio.h | 35 | ||||
| -rw-r--r-- | arch/mips/loongson/common/Makefile | 1 | ||||
| -rw-r--r-- | arch/mips/loongson/common/gpio.c | 139 |
4 files changed, 177 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 7e6fd1cbd3f..cdaae942623 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1075,6 +1075,8 @@ config CPU_LOONGSON2F bool "Loongson 2F" depends on SYS_HAS_CPU_LOONGSON2F select CPU_LOONGSON2 + select GENERIC_GPIO + select ARCH_REQUIRE_GPIOLIB help The Loongson 2F processor implements the MIPS III instruction set with many extensions. diff --git a/arch/mips/include/asm/mach-loongson/gpio.h b/arch/mips/include/asm/mach-loongson/gpio.h new file mode 100644 index 00000000000..e30e73d443d --- /dev/null +++ b/arch/mips/include/asm/mach-loongson/gpio.h @@ -0,0 +1,35 @@ +/* + * STLS2F GPIO Support + * + * Copyright (c) 2008 Richard Liu, STMicroelectronics <richard.liu@st.com> + * Copyright (c) 2008-2010 Arnaud Patard <apatard@mandriva.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. + */ + +#ifndef __STLS2F_GPIO_H +#define __STLS2F_GPIO_H + +#include <asm-generic/gpio.h> + +extern void gpio_set_value(unsigned gpio, int value); +extern int gpio_get_value(unsigned gpio); +extern int gpio_cansleep(unsigned gpio); + +/* The chip can do interrupt + * but it has not been tested and doc not clear + */ +static inline int gpio_to_irq(int gpio) +{ + return -EINVAL; +} + +static inline int irq_to_gpio(int gpio) +{ + return -EINVAL; +} + +#endif /* __STLS2F_GPIO_H */ diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile index 7668c4de115..cdd2e812ba1 100644 --- a/arch/mips/loongson/common/Makefile +++ b/arch/mips/loongson/common/Makefile @@ -4,6 +4,7 @@ obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \ pci.o bonito-irq.o mem.o machtype.o platform.o +obj-$(CONFIG_GENERIC_GPIO) += gpio.o # # Serial port support diff --git a/arch/mips/loongson/common/gpio.c b/arch/mips/loongson/common/gpio.c new file mode 100644 index 00000000000..e8a0ffa935b --- /dev/null +++ b/arch/mips/loongson/common/gpio.c @@ -0,0 +1,139 @@ +/* + * STLS2F GPIO Support + * + * Copyright (c) 2008 Richard Liu, STMicroelectronics <richard.liu@st.com> + * Copyright (c) 2008-2010 Arnaud Patard <apatard@mandriva.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 STLS2F_GPIO_IN_OFFSET 16 + +static DEFINE_SPINLOCK(gpio_lock); + +int gpio_get_value(unsigned gpio) +{ + u32 val; + u32 mask; + + if (gpio >= STLS2F_N_GPIO) + return __gpio_get_value(gpio); + + mask = 1 << (gpio + STLS2F_GPIO_IN_OFFSET); + spin_lock(&gpio_lock); + val = LOONGSON_GPIODATA; + spin_unlock(&gpio_lock); + + return ((val & mask) != 0); +} +EXPORT_SYMBOL(gpio_get_value); + +void gpio_set_value(unsigned gpio, int state) +{ + u32 val; + u32 mask; + + if (gpio >= STLS2F_N_GPIO) { + __gpio_set_value(gpio, state); + return ; + } + + mask = 1 << gpio; + + spin_lock(&gpio_lock); + val = LOONGSON_GPIODATA; + if (state) + val |= mask; + else + val &= (~mask); + LOONGSON_GPIODATA = val; + spin_unlock(&gpio_lock); +} +EXPORT_SYMBOL(gpio_set_value); + +int gpio_cansleep(unsigned gpio) +{ + if (gpio < STLS2F_N_GPIO) + return 0; + else + return __gpio_cansleep(gpio); +} +EXPORT_SYMBOL(gpio_cansleep); + +static int ls2f_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +{ + u32 temp; + u32 mask; + + if (gpio >= STLS2F_N_GPIO) + return -EINVAL; + + spin_lock(&gpio_lock); + mask = 1 << gpio; + temp = LOONGSON_GPIOIE; + temp |= mask; + LOONGSON_GPIOIE = temp; + spin_unlock(&gpio_lock); + + return 0; +} + +static int ls2f_gpio_direction_output(struct gpio_chip *chip, + unsigned gpio, int level) +{ + u32 temp; + u32 mask; + + if (gpio >= STLS2F_N_GPIO) + return -EINVAL; + + 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 ls2f_gpio_get_value(struct gpio_chip *chip, unsigned gpio) +{ + return gpio_get_value(gpio); +} + +static void ls2f_gpio_set_value(struct gpio_chip *chip, + unsigned gpio, int value) +{ + gpio_set_value(gpio, value); +} + +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, + .base = 0, + .ngpio = STLS2F_N_GPIO, +}; + +static int __init ls2f_gpio_setup(void) +{ + return gpiochip_add(&ls2f_chip); +} +arch_initcall(ls2f_gpio_setup); |