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/*
* 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 polarity 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;
}
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