159 lines
3.8 KiB
C
159 lines
3.8 KiB
C
/*
|
|
* Atheros AR71XX/AR724X/AR913X GPIO API support
|
|
*
|
|
* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
|
|
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
|
|
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
|
|
* Copyright (C) 2015 Antony Pavlov <antonynpavlov@gmail.com>
|
|
*
|
|
* Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
|
|
*
|
|
* 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 <common.h>
|
|
#include <init.h>
|
|
#include <io.h>
|
|
#include <gpio.h>
|
|
#include <malloc.h>
|
|
|
|
#include <mach/ar71xx_regs.h>
|
|
#include <mach/ath79.h>
|
|
|
|
static void __iomem *ath79_gpio_base;
|
|
static u32 ath79_gpio_count;
|
|
|
|
static void __ath79_gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
void __iomem *base = ath79_gpio_base;
|
|
|
|
if (value)
|
|
__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_SET);
|
|
else
|
|
__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_CLEAR);
|
|
}
|
|
|
|
static int __ath79_gpio_get_value(unsigned gpio)
|
|
{
|
|
return (__raw_readl(ath79_gpio_base + AR71XX_GPIO_REG_IN) >> gpio) & 1;
|
|
}
|
|
|
|
static int ath79_gpio_get_value(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
return __ath79_gpio_get_value(offset);
|
|
}
|
|
|
|
static void ath79_gpio_set_value(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
__ath79_gpio_set_value(offset, value);
|
|
}
|
|
|
|
static int ath79_gpio_direction_input(struct gpio_chip *chip,
|
|
unsigned offset)
|
|
{
|
|
void __iomem *base = ath79_gpio_base;
|
|
|
|
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
|
|
base + AR71XX_GPIO_REG_OE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ath79_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
void __iomem *base = ath79_gpio_base;
|
|
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ath79_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
|
|
void __iomem *base = ath79_gpio_base;
|
|
uint32_t oe = __raw_readl(base + AR71XX_GPIO_REG_OE);
|
|
|
|
return (oe & (1 << offset)) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
|
|
}
|
|
|
|
static struct gpio_ops ath79_gpio_ops = {
|
|
.get = ath79_gpio_get_value,
|
|
.set = ath79_gpio_set_value,
|
|
.direction_input = ath79_gpio_direction_input,
|
|
.direction_output = ath79_gpio_direction_output,
|
|
.get_direction = ath79_gpio_get_direction,
|
|
};
|
|
|
|
static struct gpio_chip ath79_gpio_chip = {
|
|
.ops = &ath79_gpio_ops,
|
|
.base = 0,
|
|
};
|
|
|
|
static const struct of_device_id ath79_gpio_of_match[] = {
|
|
{ .compatible = "qca,ar7100-gpio" },
|
|
{},
|
|
};
|
|
|
|
static int ath79_gpio_probe(struct device_d *dev)
|
|
{
|
|
struct resource *iores;
|
|
struct device_node *np = dev->device_node;
|
|
int err;
|
|
|
|
if (!np) {
|
|
dev_err(dev, "No DT node or platform data found\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = of_property_read_u32(np, "ngpios", &ath79_gpio_count);
|
|
if (err) {
|
|
dev_err(dev, "ngpios property is not valid\n");
|
|
return err;
|
|
}
|
|
if (ath79_gpio_count >= 32) {
|
|
dev_err(dev, "ngpios must be less than 32\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
iores = dev_request_mem_resource(dev, 0);
|
|
if (IS_ERR(iores)) {
|
|
dev_err(dev, "could not get memory region\n");
|
|
return PTR_ERR(iores);
|
|
}
|
|
ath79_gpio_base = IOMEM(iores->start);
|
|
|
|
ath79_gpio_chip.dev = dev;
|
|
ath79_gpio_chip.ngpio = ath79_gpio_count;
|
|
|
|
err = gpiochip_add(&ath79_gpio_chip);
|
|
if (err) {
|
|
dev_err(dev, "cannot add AR71xx GPIO chip, error=%d", err);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct driver_d ath79_gpio_driver = {
|
|
.name = "ath79-gpio",
|
|
.probe = ath79_gpio_probe,
|
|
.of_compatible = DRV_OF_COMPAT(ath79_gpio_of_match),
|
|
};
|
|
|
|
static int ath79_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&ath79_gpio_driver);
|
|
}
|
|
coredevice_initcall(ath79_gpio_init);
|