reset-imx-audiomix.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP.
*/
#include <dt-bindings/reset/imx-audiomix-reset.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset-controller.h>
#define IMX_AUDIOMIX_EARC_CTRL_REG 0x200
#define IMX_AUDIOMIX_EARC_RESET_BIT 0x0
#define IMX_AUDIOMIX_EARC_PHY_RESET_BIT 0x1
struct imx_audiomix_reset_data {
void __iomem *base;
struct reset_controller_dev rcdev;
spinlock_t lock;
};
static int imx_audiomix_reset_set(struct reset_controller_dev *rcdev,
unsigned long id, bool assert)
{
struct imx_audiomix_reset_data *drvdata = container_of(rcdev,
struct imx_audiomix_reset_data, rcdev);
void __iomem *reg_addr = drvdata->base;
unsigned long flags;
unsigned int offset;
u32 reg;
switch (id) {
case IMX_AUDIOMIX_EARC_PHY_RESET:
reg_addr += IMX_AUDIOMIX_EARC_CTRL_REG;
offset = IMX_AUDIOMIX_EARC_PHY_RESET_BIT;
break;
case IMX_AUDIOMIX_EARC_RESET:
reg_addr += IMX_AUDIOMIX_EARC_CTRL_REG;
offset = IMX_AUDIOMIX_EARC_RESET_BIT;
break;
default:
return -EINVAL;
}
if (assert) {
pm_runtime_get_sync(rcdev->dev);
spin_lock_irqsave(&drvdata->lock, flags);
reg = readl(reg_addr);
writel(reg & ~BIT(offset), reg_addr);
spin_unlock_irqrestore(&drvdata->lock, flags);
} else {
spin_lock_irqsave(&drvdata->lock, flags);
reg = readl(reg_addr);
writel(reg | BIT(offset), reg_addr);
spin_unlock_irqrestore(&drvdata->lock, flags);
pm_runtime_put(rcdev->dev);
}
return 0;
}
static int imx_audiomix_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return imx_audiomix_reset_set(rcdev, id, true);
}
static int imx_audiomix_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return imx_audiomix_reset_set(rcdev, id, false);
}
static const struct reset_control_ops imx_audiomix_reset_ops = {
.assert = imx_audiomix_reset_assert,
.deassert = imx_audiomix_reset_deassert,
};
static int imx_audiomix_reset_probe(struct platform_device *pdev)
{
struct imx_audiomix_reset_data *drvdata;
struct device *dev = &pdev->dev;
drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
if (drvdata == NULL)
return -ENOMEM;
drvdata->base = dev_get_drvdata(dev->parent);
platform_set_drvdata(pdev, drvdata);
pm_runtime_enable(dev);
spin_lock_init(&drvdata->lock);
drvdata->rcdev.owner = THIS_MODULE;
drvdata->rcdev.nr_resets = IMX_AUDIOMIX_RESET_NUM;
drvdata->rcdev.ops = &imx_audiomix_reset_ops;
drvdata->rcdev.of_node = dev->of_node;
drvdata->rcdev.dev = dev;
return devm_reset_controller_register(dev, &drvdata->rcdev);
}
static const struct of_device_id imx_audiomix_reset_dt_ids[] = {
{ .compatible = "fsl,imx8mp-audiomix-reset", },
{ /* sentinel */ },
};
static struct platform_driver imx_audiomix_reset_driver = {
.probe = imx_audiomix_reset_probe,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = imx_audiomix_reset_dt_ids,
},
};
module_platform_driver(imx_audiomix_reset_driver);