139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2021~2022 NXP
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*
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* The driver exports a standard gpiochip interface
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* to control the PIN resources on SCU domain.
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*/
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#include <linux/module.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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#include <linux/firmware/imx/svc/rm.h>
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#include <dt-bindings/firmware/imx/rsrc.h>
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struct scu_gpio_priv {
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struct gpio_chip chip;
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struct mutex lock;
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struct device *dev;
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struct imx_sc_ipc *handle;
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};
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static unsigned int scu_rsrc_arr[] = {
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IMX_SC_R_BOARD_R0,
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IMX_SC_R_BOARD_R1,
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IMX_SC_R_BOARD_R2,
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IMX_SC_R_BOARD_R3,
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IMX_SC_R_BOARD_R4,
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IMX_SC_R_BOARD_R5,
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IMX_SC_R_BOARD_R6,
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IMX_SC_R_BOARD_R7,
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};
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static int imx_scu_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct scu_gpio_priv *priv = gpiochip_get_data(chip);
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int level;
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int err;
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if (offset >= chip->ngpio)
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return -EINVAL;
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mutex_lock(&priv->lock);
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/* to read PIN state via scu api */
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err = imx_sc_misc_get_control(priv->handle,
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scu_rsrc_arr[offset], 0, &level);
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mutex_unlock(&priv->lock);
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if (err) {
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dev_err(priv->dev, "SCU get failed: %d\n", err);
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return err;
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}
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return level;
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}
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static void imx_scu_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
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{
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struct scu_gpio_priv *priv = gpiochip_get_data(chip);
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int err;
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if (offset >= chip->ngpio)
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return;
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mutex_lock(&priv->lock);
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/* to set PIN output level via scu api */
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err = imx_sc_misc_set_control(priv->handle,
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scu_rsrc_arr[offset], 0, value);
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mutex_unlock(&priv->lock);
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if (err)
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dev_err(priv->dev, "SCU set (%d) failed: %d\n",
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scu_rsrc_arr[offset], err);
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}
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static int imx_scu_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
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{
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if (offset >= chip->ngpio)
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return -EINVAL;
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return GPIO_LINE_DIRECTION_OUT;
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}
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static int imx_scu_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct scu_gpio_priv *priv;
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struct gpio_chip *gc;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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ret = imx_scu_get_handle(&priv->handle);
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if (ret)
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return ret;
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priv->dev = dev;
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mutex_init(&priv->lock);
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gc = &priv->chip;
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gc->base = -1;
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gc->parent = dev;
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gc->ngpio = sizeof(scu_rsrc_arr)/sizeof(unsigned int);
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gc->label = dev_name(dev);
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gc->get = imx_scu_gpio_get;
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gc->set = imx_scu_gpio_set;
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gc->get_direction = imx_scu_gpio_get_direction;
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platform_set_drvdata(pdev, priv);
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return devm_gpiochip_add_data(dev, gc, priv);
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}
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static const struct of_device_id imx_scu_gpio_dt_ids[] = {
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{ .compatible = "fsl,imx8qxp-sc-gpio" },
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{ /* sentinel */ }
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};
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static struct platform_driver imx_scu_gpio_driver = {
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.driver = {
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.name = "gpio-imx-scu",
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.of_match_table = imx_scu_gpio_dt_ids,
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},
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.probe = imx_scu_gpio_probe,
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};
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static int __init _imx_scu_gpio_init(void)
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{
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return platform_driver_register(&imx_scu_gpio_driver);
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}
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subsys_initcall_sync(_imx_scu_gpio_init);
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MODULE_AUTHOR("Shenwei Wang <shenwei.wang@nxp.com>");
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MODULE_DESCRIPTION("NXP GPIO over IMX SCU API");
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