2 * Ralink SoC specific GPIO support
4 * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
11 #include <linux/init.h>
14 #include <asm/mach-ralink/ramips_gpio.h>
16 static inline struct ramips_gpio_chip *to_ramips_gpio(struct gpio_chip *chip)
18 struct ramips_gpio_chip *rg;
20 rg = container_of(chip, struct ramips_gpio_chip, chip);
24 static inline void ramips_gpio_wr(struct ramips_gpio_chip *rg, u8 reg, u32 val)
26 __raw_writel(val, rg->regs_base + rg->regs[reg]);
29 static inline u32 ramips_gpio_rr(struct ramips_gpio_chip *rg, u8 reg)
31 return __raw_readl(rg->regs_base + rg->regs[reg]);
34 static int ramips_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
36 struct ramips_gpio_chip *rg = to_ramips_gpio(chip);
40 spin_lock_irqsave(&rg->lock, flags);
41 t = ramips_gpio_rr(rg, RAMIPS_GPIO_REG_DIR);
43 ramips_gpio_wr(rg, RAMIPS_GPIO_REG_DIR, t);
44 spin_unlock_irqrestore(&rg->lock, flags);
49 static int ramips_gpio_direction_output(struct gpio_chip *chip,
50 unsigned offset, int value)
52 struct ramips_gpio_chip *rg = to_ramips_gpio(chip);
57 reg = (value) ? RAMIPS_GPIO_REG_SET : RAMIPS_GPIO_REG_RESET;
59 spin_lock_irqsave(&rg->lock, flags);
60 ramips_gpio_wr(rg, reg, 1 << offset);
62 t = ramips_gpio_rr(rg, RAMIPS_GPIO_REG_DIR);
64 ramips_gpio_wr(rg, RAMIPS_GPIO_REG_DIR, t);
65 spin_unlock_irqrestore(&rg->lock, flags);
70 static void ramips_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
72 struct ramips_gpio_chip *rg = to_ramips_gpio(chip);
75 reg = (value) ? RAMIPS_GPIO_REG_SET : RAMIPS_GPIO_REG_RESET;
76 ramips_gpio_wr(rg, reg, 1 << offset);
79 static int ramips_gpio_get(struct gpio_chip *chip, unsigned offset)
81 struct ramips_gpio_chip *rg = to_ramips_gpio(chip);
84 t = ramips_gpio_rr(rg, RAMIPS_GPIO_REG_DATA);
85 return !!(t & (1 << offset));
88 static __init void ramips_gpio_chip_add(struct ramips_gpio_chip *rg)
90 spin_lock_init(&rg->lock);
92 rg->regs_base = ioremap(rg->map_base, rg->map_size);
94 rg->chip.direction_input = ramips_gpio_direction_input;
95 rg->chip.direction_output = ramips_gpio_direction_output;
96 rg->chip.get = ramips_gpio_get;
97 rg->chip.set = ramips_gpio_set;
99 /* set polarity to low for all lines */
100 ramips_gpio_wr(rg, RAMIPS_GPIO_REG_POL, 0);
102 gpiochip_add(&rg->chip);
105 __init int ramips_gpio_init(struct ramips_gpio_data *data)
109 for (i = 0; i < data->num_chips; i++)
110 ramips_gpio_chip_add(&data->chips[i]);