Commit f27ef285 authored by Enric Balletbo i Serra's avatar Enric Balletbo i Serra Committed by Matthias Brugger
Browse files

soc: mediatek: mmsys: Add reset controller support 



Among other features the mmsys driver should implement a reset
controller to be able to reset different bits from their space.

Cc: Jitao Shi <jitao.shi@mediatek.com>
Suggested-by: default avatarChun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20210930103105.v4.6.I15e2419141a69b2e5c7e700c34d92a69df47e04d@changeid


Signed-off-by: default avatarMatthias Brugger <matthias.bgg@gmail.com>
parent 13d9624d

drivers/soc/mediatek/mtk-mmsys.c

+68 −0
Original line number Diff line number Diff line
@@ -4,10 +4,12 @@ 
 * Author: James Liao <jamesjj.liao@mediatek.com>

 */



#include <linux/delay.h>

#include <linux/device.h>

#include <linux/io.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/reset-controller.h>

#include <linux/soc/mediatek/mtk-mmsys.h>



#include "mtk-mmsys.h"
@@ -69,6 +71,8 @@ static const struct mtk_mmsys_driver_data mt8365_mmsys_driver_data = { 
struct mtk_mmsys {

	void __iomem *regs;

	const struct mtk_mmsys_driver_data *data;

	spinlock_t lock; /* protects mmsys_sw_rst_b reg */

	struct reset_controller_dev rcdev;

};



void mtk_mmsys_ddp_connect(struct device *dev,
@@ -108,6 +112,58 @@ void mtk_mmsys_ddp_disconnect(struct device *dev, 
}

EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_disconnect);



static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned long id,

				  bool assert)

{

	struct mtk_mmsys *mmsys = container_of(rcdev, struct mtk_mmsys, rcdev);

	unsigned long flags;

	u32 reg;



	spin_lock_irqsave(&mmsys->lock, flags);



	reg = readl_relaxed(mmsys->regs + MMSYS_SW0_RST_B);



	if (assert)

		reg &= ~BIT(id);

	else

		reg |= BIT(id);



	writel_relaxed(reg, mmsys->regs + MMSYS_SW0_RST_B);



	spin_unlock_irqrestore(&mmsys->lock, flags);



	return 0;

}



static int mtk_mmsys_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)

{

	return mtk_mmsys_reset_update(rcdev, id, true);

}



static int mtk_mmsys_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)

{

	return mtk_mmsys_reset_update(rcdev, id, false);

}



static int mtk_mmsys_reset(struct reset_controller_dev *rcdev, unsigned long id)

{

	int ret;



	ret = mtk_mmsys_reset_assert(rcdev, id);

	if (ret)

		return ret;



	usleep_range(1000, 1100);



	return mtk_mmsys_reset_deassert(rcdev, id);

}



static const struct reset_control_ops mtk_mmsys_reset_ops = {

	.assert = mtk_mmsys_reset_assert,

	.deassert = mtk_mmsys_reset_deassert,

	.reset = mtk_mmsys_reset,

};



static int mtk_mmsys_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;
@@ -127,6 +183,18 @@ static int mtk_mmsys_probe(struct platform_device *pdev) 
		return ret;

	}



	spin_lock_init(&mmsys->lock);



	mmsys->rcdev.owner = THIS_MODULE;

	mmsys->rcdev.nr_resets = 32;

	mmsys->rcdev.ops = &mtk_mmsys_reset_ops;

	mmsys->rcdev.of_node = pdev->dev.of_node;

	ret = devm_reset_controller_register(&pdev->dev, &mmsys->rcdev);

	if (ret) {

		dev_err(&pdev->dev, "Couldn't register mmsys reset controller: %d\n", ret);

		return ret;

	}



	mmsys->data = of_device_get_match_data(&pdev->dev);

	platform_set_drvdata(pdev, mmsys);

drivers/soc/mediatek/mtk-mmsys.h

+2 −0
Original line number Diff line number Diff line
@@ -78,6 +78,8 @@ 
#define DSI_SEL_IN_RDMA				0x1

#define DSI_SEL_IN_MASK				0x1



#define MMSYS_SW0_RST_B				0x140



struct mtk_mmsys_routes {

	u32 from_comp;

	u32 to_comp;