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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2024 NXP
*/
#include <linux/auxiliary_bus.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/reset-controller.h>
#define EARC 0x200
#define EARC_RESET_MASK 0x3
struct imx8mp_audiomix_reset {
struct reset_controller_dev rcdev;
spinlock_t lock; /* protect register read-modify-write cycle */
void __iomem *base;
};
static struct imx8mp_audiomix_reset *to_imx8mp_audiomix_reset(struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct imx8mp_audiomix_reset, rcdev);
}
static int imx8mp_audiomix_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
void __iomem *reg_addr = priv->base;
unsigned int mask, reg;
unsigned long flags;
mask = BIT(id);
spin_lock_irqsave(&priv->lock, flags);
reg = readl(reg_addr + EARC);
writel(reg & ~mask, reg_addr + EARC);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static int imx8mp_audiomix_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
void __iomem *reg_addr = priv->base;
unsigned int mask, reg;
unsigned long flags;
mask = BIT(id);
spin_lock_irqsave(&priv->lock, flags);
reg = readl(reg_addr + EARC);
writel(reg | mask, reg_addr + EARC);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static const struct reset_control_ops imx8mp_audiomix_reset_ops = {
.assert = imx8mp_audiomix_reset_assert,
.deassert = imx8mp_audiomix_reset_deassert,
};
static int imx8mp_audiomix_reset_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
struct imx8mp_audiomix_reset *priv;
struct device *dev = &adev->dev;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->lock);
priv->rcdev.owner = THIS_MODULE;
priv->rcdev.nr_resets = fls(EARC_RESET_MASK);
priv->rcdev.ops = &imx8mp_audiomix_reset_ops;
priv->rcdev.of_node = dev->parent->of_node;
priv->rcdev.dev = dev;
priv->rcdev.of_reset_n_cells = 1;
priv->base = of_iomap(dev->parent->of_node, 0);
if (!priv->base)
return -ENOMEM;
dev_set_drvdata(dev, priv);
ret = devm_reset_controller_register(dev, &priv->rcdev);
if (ret)
goto out_unmap;
return 0;
out_unmap:
iounmap(priv->base);
return ret;
}
static void imx8mp_audiomix_reset_remove(struct auxiliary_device *adev)
{
struct imx8mp_audiomix_reset *priv = dev_get_drvdata(&adev->dev);
iounmap(priv->base);
}
static const struct auxiliary_device_id imx8mp_audiomix_reset_ids[] = {
{
.name = "clk_imx8mp_audiomix.reset",
},
{ }
};
MODULE_DEVICE_TABLE(auxiliary, imx8mp_audiomix_reset_ids);
static struct auxiliary_driver imx8mp_audiomix_reset_driver = {
.probe = imx8mp_audiomix_reset_probe,
.remove = imx8mp_audiomix_reset_remove,
.id_table = imx8mp_audiomix_reset_ids,
};
module_auxiliary_driver(imx8mp_audiomix_reset_driver);
MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
MODULE_DESCRIPTION("Freescale i.MX8MP Audio Block Controller reset driver");
MODULE_LICENSE("GPL");
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