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gpio-en7523.c
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gpio-en7523.c
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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/types.h>
#include <linux/io.h>
#include <linux/bits.h>
#include <linux/gpio/driver.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#define AIROHA_GPIO_MAX 32
/**
* airoha_gpio_ctrl - Airoha GPIO driver data
* @gc: Associated gpio_chip instance.
* @data: The data register.
* @dir0: The direction register for the lower 16 pins.
* @dir1: The direction register for the higher 16 pins.
* @output: The output enable register.
*/
struct airoha_gpio_ctrl {
struct gpio_chip gc;
void __iomem *data;
void __iomem *dir[2];
void __iomem *output;
};
static struct airoha_gpio_ctrl *gc_to_ctrl(struct gpio_chip *gc)
{
return container_of(gc, struct airoha_gpio_ctrl, gc);
}
static int airoha_dir_set(struct gpio_chip *gc, unsigned int gpio,
int val, int out)
{
struct airoha_gpio_ctrl *ctrl = gc_to_ctrl(gc);
u32 dir = ioread32(ctrl->dir[gpio / 16]);
u32 output = ioread32(ctrl->output);
u32 mask = BIT((gpio % 16) * 2);
if (out) {
dir |= mask;
output |= BIT(gpio);
} else {
dir &= ~mask;
output &= ~BIT(gpio);
}
iowrite32(dir, ctrl->dir[gpio / 16]);
if (out)
gc->set(gc, gpio, val);
iowrite32(output, ctrl->output);
return 0;
}
static int airoha_dir_out(struct gpio_chip *gc, unsigned int gpio,
int val)
{
return airoha_dir_set(gc, gpio, val, 1);
}
static int airoha_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
return airoha_dir_set(gc, gpio, 0, 0);
}
static int airoha_get_dir(struct gpio_chip *gc, unsigned int gpio)
{
struct airoha_gpio_ctrl *ctrl = gc_to_ctrl(gc);
u32 dir = ioread32(ctrl->dir[gpio / 16]);
u32 mask = BIT((gpio % 16) * 2);
return (dir & mask) ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
}
static int airoha_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct airoha_gpio_ctrl *ctrl;
int err;
ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
ctrl->data = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(ctrl->data))
return PTR_ERR(ctrl->data);
ctrl->dir[0] = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(ctrl->dir[0]))
return PTR_ERR(ctrl->dir[0]);
ctrl->dir[1] = devm_platform_ioremap_resource(pdev, 2);
if (IS_ERR(ctrl->dir[1]))
return PTR_ERR(ctrl->dir[1]);
ctrl->output = devm_platform_ioremap_resource(pdev, 3);
if (IS_ERR(ctrl->output))
return PTR_ERR(ctrl->output);
err = bgpio_init(&ctrl->gc, dev, 4, ctrl->data, NULL,
NULL, NULL, NULL, 0);
if (err)
return dev_err_probe(dev, err, "unable to init generic GPIO");
ctrl->gc.ngpio = AIROHA_GPIO_MAX;
ctrl->gc.owner = THIS_MODULE;
ctrl->gc.direction_output = airoha_dir_out;
ctrl->gc.direction_input = airoha_dir_in;
ctrl->gc.get_direction = airoha_get_dir;
return devm_gpiochip_add_data(dev, &ctrl->gc, ctrl);
}
static const struct of_device_id airoha_gpio_of_match[] = {
{ .compatible = "airoha,en7523-gpio" },
{ }
};
MODULE_DEVICE_TABLE(of, airoha_gpio_of_match);
static struct platform_driver airoha_gpio_driver = {
.driver = {
.name = "airoha-gpio",
.of_match_table = airoha_gpio_of_match,
},
.probe = airoha_gpio_probe,
};
module_platform_driver(airoha_gpio_driver);
MODULE_DESCRIPTION("Airoha GPIO support");
MODULE_AUTHOR("John Crispin <[email protected]>");
MODULE_LICENSE("GPL v2");