Commit fe125601 authored by Shengjiu Wang's avatar Shengjiu Wang Committed by Philipp Zabel
Browse files

reset: imx8mp-audiomix: Add AudioMix Block Control reset driver 



Add support for the resets on i.MX8MP Audio Block Control module,
which includes the EARC PHY software reset and EARC controller
software reset. The reset controller is created using the auxiliary
device framework and set up in the clock driver.

Signed-off-by: default avatarShengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: default avatarMarco Felsch <m.felsch@pengutronix.de>
Reviewed-by: default avatarAbel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/1719200345-32006-1-git-send-email-shengjiu.wang@nxp.com


Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent 0e8b3bca

drivers/reset/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -91,6 +91,13 @@ config RESET_IMX7 
	help

	  This enables the reset controller driver for i.MX7 SoCs.



config RESET_IMX8MP_AUDIOMIX

	tristate "i.MX8MP AudioMix Reset Driver"

	select AUXILIARY_BUS

	default CLK_IMX8MP

	help

	  This enables the reset controller driver for i.MX8MP AudioMix



config RESET_INTEL_GW

	bool "Intel Reset Controller Driver"

	depends on X86 || COMPILE_TEST

drivers/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o 
obj-$(CONFIG_RESET_GPIO) += reset-gpio.o

obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o

obj-$(CONFIG_RESET_IMX7) += reset-imx7.o

obj-$(CONFIG_RESET_IMX8MP_AUDIOMIX) += reset-imx8mp-audiomix.o

obj-$(CONFIG_RESET_INTEL_GW) += reset-intel-gw.o

obj-$(CONFIG_RESET_K210) += reset-k210.o

obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o

drivers/reset/reset-imx8mp-audiomix.c

0 → 100644
+128 −0
Original line number Diff line number Diff line 
// 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");