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