mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
0868ad385a
Airoha's GPIO controller on their ARM EN7523 SoCs consists of two banks of 32 GPIOs. Each instance in DT is for a single bank. Acked-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: John Crispin <john@phrozen.org> Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
// 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 <john@phrozen.org>");
|
|
MODULE_LICENSE("GPL v2");
|