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/*
* Atheros AR7XXX/AR9XXX SoC GPIO API support
*
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/gpio.h>
#include <asm/mach-ar71xx/ar71xx.h>
static DEFINE_SPINLOCK(ar71xx_gpio_lock);
unsigned long ar71xx_gpio_count;
EXPORT_SYMBOL(ar71xx_gpio_count);
void __ar71xx_gpio_set_value(unsigned gpio, int value)
{
void __iomem *base = ar71xx_gpio_base;
if (value)
__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_SET);
else
__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_CLEAR);
}
EXPORT_SYMBOL(__ar71xx_gpio_set_value);
int __ar71xx_gpio_get_value(unsigned gpio)
{
return (__raw_readl(ar71xx_gpio_base + AR71XX_GPIO_REG_IN) >> gpio) & 1;
}
EXPORT_SYMBOL(__ar71xx_gpio_get_value);
static int ar71xx_gpio_get_value(struct gpio_chip *chip, unsigned offset)
{
return __ar71xx_gpio_get_value(offset);
}
static void ar71xx_gpio_set_value(struct gpio_chip *chip,
unsigned offset, int value)
{
__ar71xx_gpio_set_value(offset, value);
}
static int ar71xx_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
return 0;
}
static int ar71xx_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
if (value)
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
else
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
return 0;
}
static int ar934x_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
return 0;
}
static int ar934x_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
if (value)
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
else
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
return 0;
}
static struct gpio_chip ar71xx_gpio_chip = {
.label = "ar71xx",
.get = ar71xx_gpio_get_value,
.set = ar71xx_gpio_set_value,
.direction_input = ar71xx_gpio_direction_input,
.direction_output = ar71xx_gpio_direction_output,
.base = 0,
.ngpio = AR71XX_GPIO_COUNT,
};
void ar71xx_gpio_function_enable(u32 mask)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
unsigned int reg;
if (ar71xx_soc == AR71XX_SOC_AR9341 ||
ar71xx_soc == AR71XX_SOC_AR9342 ||
ar71xx_soc == AR71XX_SOC_AR9344) {
reg = AR934X_GPIO_REG_FUNC;
} else {
reg = AR71XX_GPIO_REG_FUNC;
}
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
__raw_writel(__raw_readl(base + reg) | mask, base + reg);
/* flush write */
(void) __raw_readl(base + reg);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
}
void ar71xx_gpio_function_disable(u32 mask)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
unsigned int reg;
if (ar71xx_soc == AR71XX_SOC_AR9341 ||
ar71xx_soc == AR71XX_SOC_AR9342 ||
ar71xx_soc == AR71XX_SOC_AR9344) {
reg = AR934X_GPIO_REG_FUNC;
} else {
reg = AR71XX_GPIO_REG_FUNC;
}
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
__raw_writel(__raw_readl(base + reg) & ~mask, base + reg);
/* flush write */
(void) __raw_readl(base + reg);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
}
void ar71xx_gpio_function_setup(u32 set, u32 clear)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
unsigned int reg;
if (ar71xx_soc == AR71XX_SOC_AR9341 ||
ar71xx_soc == AR71XX_SOC_AR9342 ||
ar71xx_soc == AR71XX_SOC_AR9344) {
reg = AR934X_GPIO_REG_FUNC;
} else {
reg = AR71XX_GPIO_REG_FUNC;
}
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
__raw_writel((__raw_readl(base + reg) & ~clear) | set, base + reg);
/* flush write */
(void) __raw_readl(base + reg);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
}
EXPORT_SYMBOL(ar71xx_gpio_function_setup);
void __init ar71xx_gpio_output_select(unsigned gpio, u8 val)
{
void __iomem *base = ar71xx_gpio_base;
unsigned long flags;
unsigned int reg;
u32 t, s;
if (ar71xx_soc != AR71XX_SOC_AR9341 &&
ar71xx_soc != AR71XX_SOC_AR9342 &&
ar71xx_soc != AR71XX_SOC_AR9344)
return;
if (gpio >= AR934X_GPIO_COUNT)
return;
reg = AR934X_GPIO_REG_OUT_FUNC0 + 4 * (gpio / 4);
s = 8 * (gpio % 4);
spin_lock_irqsave(&ar71xx_gpio_lock, flags);
t = __raw_readl(base + reg);
t &= ~(0xff << s);
t |= val << s;
__raw_writel(t, base + reg);
/* flush write */
(void) __raw_readl(base + reg);
spin_unlock_irqrestore(&ar71xx_gpio_lock, flags);
}
void __init ar71xx_gpio_init(void)
{
int err;
if (!request_mem_region(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE,
"AR71xx GPIO controller"))
panic("cannot allocate AR71xx GPIO registers page");
switch (ar71xx_soc) {
case AR71XX_SOC_AR7130:
case AR71XX_SOC_AR7141:
case AR71XX_SOC_AR7161:
ar71xx_gpio_chip.ngpio = AR71XX_GPIO_COUNT;
break;
case AR71XX_SOC_AR7240:
ar71xx_gpio_chip.ngpio = AR7240_GPIO_COUNT;
break;
case AR71XX_SOC_AR7241:
case AR71XX_SOC_AR7242:
ar71xx_gpio_chip.ngpio = AR7241_GPIO_COUNT;
break;
case AR71XX_SOC_AR9130:
case AR71XX_SOC_AR9132:
ar71xx_gpio_chip.ngpio = AR91XX_GPIO_COUNT;
break;
case AR71XX_SOC_AR9330:
case AR71XX_SOC_AR9331:
ar71xx_gpio_chip.ngpio = AR933X_GPIO_COUNT;
break;
case AR71XX_SOC_AR9341:
case AR71XX_SOC_AR9342:
case AR71XX_SOC_AR9344:
ar71xx_gpio_chip.ngpio = AR934X_GPIO_COUNT;
ar71xx_gpio_chip.direction_input = ar934x_gpio_direction_input;
ar71xx_gpio_chip.direction_output = ar934x_gpio_direction_output;
break;
default:
BUG();
}
err = gpiochip_add(&ar71xx_gpio_chip);
if (err)
panic("cannot add AR71xx GPIO chip, error=%d", err);
}
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