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soc: mediatek: mmsys: Add reset controller support

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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: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20210930103105.v4.6.I15e2419141a69b2e5c7e700c34d92a69df47e04d@changeid
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
This commit is contained in:
Enric Balletbo i Serra 2021-09-30 10:31:49 +02:00 committed by Matthias Brugger
parent 13d9624da4
commit f27ef28563
2 changed files with 70 additions and 0 deletions
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68
drivers/soc/mediatek/mtk-mmsys.c
View File

@ -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);

2
drivers/soc/mediatek/mtk-mmsys.h
View File

@ -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;