mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-27 09:03:20 +02:00
675367fe81
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22171 3c298f89-4303-0410-b956-a3cf2f4a3e73
237 lines
6.2 KiB
C
237 lines
6.2 KiB
C
/*
|
|
* 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/spinlock.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_FENA,
|
|
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;
|
|
spinlock_t lock;
|
|
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);
|
|
unsigned long flags;
|
|
u32 t;
|
|
|
|
spin_lock_irqsave(&rg->lock, flags);
|
|
t = ramips_gpio_rr(rg, RAMIPS_GPIO_REG_DIR);
|
|
t &= ~(1 << offset);
|
|
ramips_gpio_wr(rg, RAMIPS_GPIO_REG_DIR, t);
|
|
spin_unlock_irqrestore(&rg->lock, flags);
|
|
|
|
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);
|
|
unsigned long flags;
|
|
u32 reg;
|
|
u32 t;
|
|
|
|
reg = (value) ? RAMIPS_GPIO_REG_SET : RAMIPS_GPIO_REG_RESET;
|
|
|
|
spin_lock_irqsave(&rg->lock, flags);
|
|
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);
|
|
spin_unlock_irqrestore(&rg->lock, flags);
|
|
|
|
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_FENA] = GPIO0_REG_FENA,
|
|
[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_FENA] = GPIO1_REG_FENA,
|
|
[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_FENA] = GPIO2_REG_FENA,
|
|
[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)
|
|
{
|
|
spin_lock_init(&rg->lock);
|
|
|
|
/* 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;
|
|
}
|