mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 00:11:13 +00:00
149 lines
3.4 KiB
C
149 lines
3.4 KiB
C
/*
|
|
* Moschip MCS814x GPIO support
|
|
*
|
|
* Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
|
|
*
|
|
* Licensed under the GPLv2
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
|
|
struct mcs814x_gpio_chip {
|
|
void __iomem *regs;
|
|
struct gpio_chip chip;
|
|
};
|
|
|
|
#define GPIO_PIN 0x00
|
|
#define GPIO_DIR 0x04
|
|
|
|
#define to_mcs814x_gpio_chip(x) container_of(x, struct mcs814x_gpio_chip, chip)
|
|
|
|
static int mcs814x_gpio_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct mcs814x_gpio_chip *mcs814x = to_mcs814x_gpio_chip(chip);
|
|
|
|
return readl_relaxed(mcs814x->regs + GPIO_PIN) & (1 << offset);
|
|
}
|
|
|
|
static void mcs814x_gpio_set(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
struct mcs814x_gpio_chip *mcs814x = to_mcs814x_gpio_chip(chip);
|
|
u32 mask;
|
|
|
|
mask = readl_relaxed(mcs814x->regs + GPIO_PIN);
|
|
if (value)
|
|
mask |= (1 << offset);
|
|
else
|
|
mask &= ~(1 << offset);
|
|
writel_relaxed(mask, mcs814x->regs + GPIO_PIN);
|
|
}
|
|
|
|
static int mcs814x_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
struct mcs814x_gpio_chip *mcs814x = to_mcs814x_gpio_chip(chip);
|
|
u32 mask;
|
|
|
|
mask = readl_relaxed(mcs814x->regs + GPIO_DIR);
|
|
mask &= ~(1 << offset);
|
|
writel_relaxed(mask, mcs814x->regs + GPIO_DIR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mcs814x_gpio_direction_input(struct gpio_chip *chip,
|
|
unsigned offset)
|
|
{
|
|
struct mcs814x_gpio_chip *mcs814x = to_mcs814x_gpio_chip(chip);
|
|
u32 mask;
|
|
|
|
mask = readl_relaxed(mcs814x->regs + GPIO_DIR);
|
|
mask |= (1 << offset);
|
|
writel_relaxed(mask, mcs814x->regs + GPIO_DIR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mcs814x_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
struct mcs814x_gpio_chip *mcs814x_chip;
|
|
int ret;
|
|
const unsigned int *num_gpios;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
num_gpios = of_get_property(pdev->dev.of_node, "num-gpios", NULL);
|
|
if (!num_gpios)
|
|
dev_err(&pdev->dev, "FIXME: no num-gpios property\n");
|
|
|
|
mcs814x_chip = kzalloc(sizeof(*mcs814x_chip), GFP_KERNEL);
|
|
if (!mcs814x_chip)
|
|
return -ENOMEM;
|
|
|
|
mcs814x_chip->regs = devm_ioremap_resource(&pdev->dev, res);
|
|
if (!mcs814x_chip->regs) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, mcs814x_chip);
|
|
|
|
#ifdef CONFIG_OF_GPIO
|
|
mcs814x_chip->chip.of_node = pdev->dev.of_node;
|
|
#endif
|
|
|
|
mcs814x_chip->chip.label = pdev->name;
|
|
mcs814x_chip->chip.get = mcs814x_gpio_get;
|
|
mcs814x_chip->chip.set = mcs814x_gpio_set;
|
|
mcs814x_chip->chip.direction_input = mcs814x_gpio_direction_input;
|
|
mcs814x_chip->chip.direction_output = mcs814x_gpio_direction_output;
|
|
mcs814x_chip->chip.ngpio = be32_to_cpup(num_gpios);
|
|
/* we want dynamic base allocation */
|
|
mcs814x_chip->chip.base = -1;
|
|
|
|
ret = gpiochip_add(&mcs814x_chip->chip);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register gpiochip\n");
|
|
goto out;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out:
|
|
platform_set_drvdata(pdev, NULL);
|
|
kfree(mcs814x_chip);
|
|
return ret;
|
|
}
|
|
|
|
static struct of_device_id mcs814x_gpio_ids[] = {
|
|
{ .compatible = "moschip,mcs814x-gpio" },
|
|
{ /* sentinel */ },
|
|
};
|
|
|
|
static struct platform_driver mcs814x_gpio_driver = {
|
|
.driver = {
|
|
.name = "mcs814x-gpio",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = mcs814x_gpio_ids,
|
|
},
|
|
.probe = mcs814x_gpio_probe,
|
|
};
|
|
|
|
int __init mcs814x_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&mcs814x_gpio_driver);
|
|
}
|
|
postcore_initcall(mcs814x_gpio_init);
|