mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
9bc167e27c
This patch adds DT support for Loongson-1 GPIO driver. Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* GPIO Driver for Loongson 1 SoC
|
|
*
|
|
* Copyright (C) 2015-2023 Keguang Zhang <keguang.zhang@gmail.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/bitops.h>
|
|
|
|
/* Loongson 1 GPIO Register Definitions */
|
|
#define GPIO_CFG 0x0
|
|
#define GPIO_DIR 0x10
|
|
#define GPIO_DATA 0x20
|
|
#define GPIO_OUTPUT 0x30
|
|
|
|
struct ls1x_gpio_chip {
|
|
struct gpio_chip gc;
|
|
void __iomem *reg_base;
|
|
};
|
|
|
|
static int ls1x_gpio_request(struct gpio_chip *gc, unsigned int offset)
|
|
{
|
|
struct ls1x_gpio_chip *ls1x_gc = gpiochip_get_data(gc);
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
|
|
__raw_writel(__raw_readl(ls1x_gc->reg_base + GPIO_CFG) | BIT(offset),
|
|
ls1x_gc->reg_base + GPIO_CFG);
|
|
raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ls1x_gpio_free(struct gpio_chip *gc, unsigned int offset)
|
|
{
|
|
struct ls1x_gpio_chip *ls1x_gc = gpiochip_get_data(gc);
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
|
|
__raw_writel(__raw_readl(ls1x_gc->reg_base + GPIO_CFG) & ~BIT(offset),
|
|
ls1x_gc->reg_base + GPIO_CFG);
|
|
raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
|
|
}
|
|
|
|
static int ls1x_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct ls1x_gpio_chip *ls1x_gc;
|
|
int ret;
|
|
|
|
ls1x_gc = devm_kzalloc(dev, sizeof(*ls1x_gc), GFP_KERNEL);
|
|
if (!ls1x_gc)
|
|
return -ENOMEM;
|
|
|
|
ls1x_gc->reg_base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(ls1x_gc->reg_base))
|
|
return PTR_ERR(ls1x_gc->reg_base);
|
|
|
|
ret = bgpio_init(&ls1x_gc->gc, dev, 4, ls1x_gc->reg_base + GPIO_DATA,
|
|
ls1x_gc->reg_base + GPIO_OUTPUT, NULL,
|
|
NULL, ls1x_gc->reg_base + GPIO_DIR, 0);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ls1x_gc->gc.owner = THIS_MODULE;
|
|
ls1x_gc->gc.request = ls1x_gpio_request;
|
|
ls1x_gc->gc.free = ls1x_gpio_free;
|
|
/*
|
|
* Clear ngpio to let gpiolib get the correct number
|
|
* by reading ngpios property
|
|
*/
|
|
ls1x_gc->gc.ngpio = 0;
|
|
|
|
ret = devm_gpiochip_add_data(dev, &ls1x_gc->gc, ls1x_gc);
|
|
if (ret)
|
|
goto err;
|
|
|
|
platform_set_drvdata(pdev, ls1x_gc);
|
|
|
|
dev_info(dev, "GPIO controller registered with %d pins\n",
|
|
ls1x_gc->gc.ngpio);
|
|
|
|
return 0;
|
|
err:
|
|
dev_err(dev, "failed to register GPIO controller\n");
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id ls1x_gpio_dt_ids[] = {
|
|
{ .compatible = "loongson,ls1x-gpio" },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ls1x_gpio_dt_ids);
|
|
|
|
static struct platform_driver ls1x_gpio_driver = {
|
|
.probe = ls1x_gpio_probe,
|
|
.driver = {
|
|
.name = "ls1x-gpio",
|
|
.of_match_table = ls1x_gpio_dt_ids,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(ls1x_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Keguang Zhang <keguang.zhang@gmail.com>");
|
|
MODULE_DESCRIPTION("Loongson1 GPIO driver");
|
|
MODULE_LICENSE("GPL");
|