diff options
Diffstat (limited to 'target/linux/ramips/files/arch/mips/ralink/common/gpio.c')
| -rw-r--r-- | target/linux/ramips/files/arch/mips/ralink/common/gpio.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/target/linux/ramips/files/arch/mips/ralink/common/gpio.c b/target/linux/ramips/files/arch/mips/ralink/common/gpio.c new file mode 100644 index 000000000..af4cac738 --- /dev/null +++ b/target/linux/ramips/files/arch/mips/ralink/common/gpio.c @@ -0,0 +1,224 @@ +/* + * Ralink SoC specific GPIO support + * + * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/io.h> + +#include <linux/gpio.h> + +#include <ralink_soc.h> + +#define GPIO0_REG_INT 0x00 +#define GPIO0_REG_EDGE 0x04 +#define GPIO0_REG_RENA 0x08 +#define GPIO0_REG_FENA 0x0c +#define GPIO0_REG_DATA 0x20 +#define GPIO0_REG_DIR 0x24 +#define GPIO0_REG_POL 0x28 +#define GPIO0_REG_SET 0x2c +#define GPIO0_REG_RESET 0x30 +#define GPIO0_REG_TOGGLE 0x34 + +#define GPIO1_REG_INT 0x38 +#define GPIO1_REG_EDGE 0x3c +#define GPIO1_REG_RENA 0x40 +#define GPIO1_REG_FENA 0x44 +#define GPIO1_REG_DATA 0x48 +#define GPIO1_REG_DIR 0x4c +#define GPIO1_REG_POL 0x50 +#define GPIO1_REG_SET 0x54 +#define GPIO1_REG_RESET 0x58 +#define GPIO1_REG_TOGGLE 0x5c + +#define GPIO2_REG_INT 0x60 +#define GPIO2_REG_EDGE 0x64 +#define GPIO2_REG_RENA 0x68 +#define GPIO2_REG_FENA 0x6c +#define GPIO2_REG_DATA 0x70 +#define GPIO2_REG_DIR 0x74 +#define GPIO2_REG_POL 0x78 +#define GPIO2_REG_SET 0x7c +#define GPIO2_REG_RESET 0x80 +#define GPIO2_REG_TOGGLE 0x84 + +enum ramips_pio_reg { + RAMIPS_GPIO_REG_INT, /* Interrupt status */ + RAMIPS_GPIO_REG_EDGE, + RAMIPS_GPIO_REG_RENA, + RAMIPS_GPIO_REG_DATA, + RAMIPS_GPIO_REG_DIR, /* Direction, 0:in, 1: out */ + RAMIPS_GPIO_REG_POL, /* Polarity, 0: normal, 1: invert */ + RAMIPS_GPIO_REG_SET, + RAMIPS_GPIO_REG_RESET, + RAMIPS_GPIO_REG_TOGGLE, + RAMIPS_GPIO_REG_MAX +}; + +struct ramips_gpio_chip { + struct gpio_chip chip; + u8 regs[RAMIPS_GPIO_REG_MAX]; +}; + +static void __iomem *ramips_gpio_base; + +static inline struct ramips_gpio_chip *to_ramips_gpio(struct gpio_chip *chip) +{ + struct ramips_gpio_chip *rg; + + rg = container_of(chip, struct ramips_gpio_chip, chip); + return rg; +} + +static inline void ramips_gpio_wr(struct ramips_gpio_chip *rg, u8 reg, u32 val) +{ + __raw_writel(val, ramips_gpio_base + rg->regs[reg]); +} + +static inline u32 ramips_gpio_rr(struct ramips_gpio_chip *rg, u8 reg) +{ + return __raw_readl(ramips_gpio_base + rg->regs[reg]); +} + +static int ramips_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct ramips_gpio_chip *rg = to_ramips_gpio(chip); + u32 t; + + t = ramips_gpio_rr(rg, RAMIPS_GPIO_REG_DIR); + t &= ~(1 << offset); + ramips_gpio_wr(rg, RAMIPS_GPIO_REG_DIR, t); + + return 0; +} + +static int ramips_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct ramips_gpio_chip *rg = to_ramips_gpio(chip); + u32 reg; + u32 t; + + reg = (value) ? RAMIPS_GPIO_REG_SET : RAMIPS_GPIO_REG_RESET; + ramips_gpio_wr(rg, reg, 1 << offset); + + t = ramips_gpio_rr(rg, RAMIPS_GPIO_REG_DIR); + t |= 1 << offset; + ramips_gpio_wr(rg, RAMIPS_GPIO_REG_DIR, t); + + return 0; +} + +static void ramips_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct ramips_gpio_chip *rg = to_ramips_gpio(chip); + u32 reg; + + reg = (value) ? RAMIPS_GPIO_REG_SET : RAMIPS_GPIO_REG_RESET; + ramips_gpio_wr(rg, reg, 1 << offset); +} + +static int ramips_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct ramips_gpio_chip *rg = to_ramips_gpio(chip); + u32 t; + + t = ramips_gpio_rr(rg, RAMIPS_GPIO_REG_DATA); + return (t & (1 << offset)); +} + +static struct ramips_gpio_chip ramips_gpio_chip0 = { + .chip = { + .label = "ramips-gpio0", + .direction_input = ramips_gpio_direction_input, + .direction_output = ramips_gpio_direction_output, + .get = ramips_gpio_get, + .set = ramips_gpio_set, + .base = 0, + .ngpio = RALINK_SOC_GPIO0_COUNT, + }, + .regs = { + [RAMIPS_GPIO_REG_INT] = GPIO0_REG_INT, + [RAMIPS_GPIO_REG_EDGE] = GPIO0_REG_EDGE, + [RAMIPS_GPIO_REG_RENA] = GPIO0_REG_RENA, + [RAMIPS_GPIO_REG_DATA] = GPIO0_REG_DATA, + [RAMIPS_GPIO_REG_DIR] = GPIO0_REG_DIR, + [RAMIPS_GPIO_REG_POL] = GPIO0_REG_POL, + [RAMIPS_GPIO_REG_SET] = GPIO0_REG_SET, + [RAMIPS_GPIO_REG_RESET] = GPIO0_REG_RESET, + [RAMIPS_GPIO_REG_TOGGLE] = GPIO0_REG_TOGGLE, + }, +}; + +static struct ramips_gpio_chip ramips_gpio_chip1 = { + .chip = { + .label = "ramips-gpio1", + .direction_input = ramips_gpio_direction_input, + .direction_output = ramips_gpio_direction_output, + .get = ramips_gpio_get, + .set = ramips_gpio_set, + .base = 32, + .ngpio = RALINK_SOC_GPIO1_COUNT, + }, + .regs = { + [RAMIPS_GPIO_REG_INT] = GPIO1_REG_INT, + [RAMIPS_GPIO_REG_EDGE] = GPIO1_REG_EDGE, + [RAMIPS_GPIO_REG_RENA] = GPIO1_REG_RENA, + [RAMIPS_GPIO_REG_DATA] = GPIO1_REG_DATA, + [RAMIPS_GPIO_REG_DIR] = GPIO1_REG_DIR, + [RAMIPS_GPIO_REG_POL] = GPIO1_REG_POL, + [RAMIPS_GPIO_REG_SET] = GPIO1_REG_SET, + [RAMIPS_GPIO_REG_RESET] = GPIO1_REG_RESET, + [RAMIPS_GPIO_REG_TOGGLE] = GPIO1_REG_TOGGLE, + }, +}; + +static struct ramips_gpio_chip ramips_gpio_chip2 = { + .chip = { + .label = "ramips-gpio2", + .direction_input = ramips_gpio_direction_input, + .direction_output = ramips_gpio_direction_output, + .get = ramips_gpio_get, + .set = ramips_gpio_set, + .base = 64, + .ngpio = RALINK_SOC_GPIO2_COUNT, + }, + .regs = { + [RAMIPS_GPIO_REG_INT] = GPIO2_REG_INT, + [RAMIPS_GPIO_REG_EDGE] = GPIO2_REG_EDGE, + [RAMIPS_GPIO_REG_RENA] = GPIO2_REG_RENA, + [RAMIPS_GPIO_REG_DATA] = GPIO2_REG_DATA, + [RAMIPS_GPIO_REG_DIR] = GPIO2_REG_DIR, + [RAMIPS_GPIO_REG_POL] = GPIO2_REG_POL, + [RAMIPS_GPIO_REG_SET] = GPIO2_REG_SET, + [RAMIPS_GPIO_REG_RESET] = GPIO2_REG_RESET, + [RAMIPS_GPIO_REG_TOGGLE] = GPIO2_REG_TOGGLE, + }, +}; + +static __init void ramips_gpio_chip_add(struct ramips_gpio_chip *rg) +{ + /* set priority to low for all lines */ + ramips_gpio_wr(rg, RAMIPS_GPIO_REG_POL, 0); + + gpiochip_add(&rg->chip); +} + +__init int ramips_gpio_init(void) +{ + ramips_gpio_base = ioremap_nocache(RALINK_SOC_GPIO_BASE, PAGE_SIZE); + + ramips_gpio_chip_add(&ramips_gpio_chip0); + ramips_gpio_chip_add(&ramips_gpio_chip1); + ramips_gpio_chip_add(&ramips_gpio_chip2); + + return 0; +} + +arch_initcall(ramips_gpio_init); |