gpio-scu.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2021 NXP
*
* The driver exports a standard gpiochip interface
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/firmware/imx/svc/rm.h>
#include <dt-bindings/firmware/imx/rsrc.h>
#define PIN_NUMBER 8
struct imxscfw {
struct mutex lock;
struct imx_sc_ipc *handle;
struct gpio_chip chip;
struct device *dev;
};
static unsigned int sc_arr[] = {
IMX_SC_R_BOARD_R0,
IMX_SC_R_BOARD_R1,
IMX_SC_R_BOARD_R2,
IMX_SC_R_BOARD_R3,
IMX_SC_R_BOARD_R4,
IMX_SC_R_BOARD_R5,
IMX_SC_R_BOARD_R6, //R6 is MII select
IMX_SC_R_BOARD_R7,
};
static int imxscfw_get(struct gpio_chip *chip, unsigned int offset)
{
struct imxscfw *scu = gpiochip_get_data(chip);
int err = -EINVAL, level = 0;
if (offset >= sizeof(sc_arr)/sizeof(unsigned int))
return err;
mutex_lock(&scu->lock);
/* to read PIN state via scu api */
err = imx_sc_misc_get_control(scu->handle, sc_arr[offset],
0, &level);
mutex_unlock(&scu->lock);
if (err) {
pr_err("%s: failed %d\n", __func__, err);
return -EINVAL;
}
return level;
}
static void imxscfw_set(struct gpio_chip *chip, unsigned int offset, int value)
{
struct imxscfw *scu = gpiochip_get_data(chip);
int err;
if (offset >= sizeof(sc_arr)/sizeof(unsigned int))
return;
mutex_lock(&scu->lock);
/* to set PIN output level via scu api */
err = imx_sc_misc_set_control(scu->handle, sc_arr[offset], 0, value);
mutex_unlock(&scu->lock);
if (err)
pr_err("%s: failed %d\n", __func__, err);
}
static int imx_scu_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct imxscfw *port;
struct gpio_chip *gc;
int ret;
port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
ret = imx_scu_get_handle(&port->handle);
if (ret)
return ret;
mutex_init(&port->lock);
gc = &port->chip;
gc->of_node = np;
gc->parent = dev;
gc->label = "imx-scu-gpio";
gc->ngpio = PIN_NUMBER;
gc->base = of_alias_get_id(np, "gpio") * 32;
gc->get = imxscfw_get;
gc->set = imxscfw_set;
platform_set_drvdata(pdev, port);
ret = devm_gpiochip_add_data(dev, gc, port);
return ret;
}
static const struct of_device_id imx_scu_gpio_dt_ids[] = {
{ .compatible = "fsl,imx-scu-gpio" },
{ /* sentinel */ }
};
static struct platform_driver imx_scu_gpio_driver = {
.driver = {
.name = "gpio-imx-scu",
.of_match_table = imx_scu_gpio_dt_ids,
},
.probe = imx_scu_gpio_probe,
};
static int __init _imx_scu_gpio_init(void)
{
return platform_driver_register(&imx_scu_gpio_driver);
}
subsys_initcall_sync(_imx_scu_gpio_init);
MODULE_AUTHOR("Shenwei Wang");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("NXP GPIO over SCU-MISC API, i.MX8");