linux-stable/drivers/soc/mediatek/mtk-mmsys.c
Enric Balletbo i Serra f27ef28563 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: 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>
2021-10-08 15:15:26 +02:00

264 lines
6.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014 MediaTek Inc.
* 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"
#include "mt8167-mmsys.h"
#include "mt8183-mmsys.h"
#include "mt8192-mmsys.h"
#include "mt8365-mmsys.h"
static const struct mtk_mmsys_driver_data mt2701_mmsys_driver_data = {
.clk_driver = "clk-mt2701-mm",
.routes = mmsys_default_routing_table,
.num_routes = ARRAY_SIZE(mmsys_default_routing_table),
};
static const struct mtk_mmsys_driver_data mt2712_mmsys_driver_data = {
.clk_driver = "clk-mt2712-mm",
.routes = mmsys_default_routing_table,
.num_routes = ARRAY_SIZE(mmsys_default_routing_table),
};
static const struct mtk_mmsys_driver_data mt6779_mmsys_driver_data = {
.clk_driver = "clk-mt6779-mm",
};
static const struct mtk_mmsys_driver_data mt6797_mmsys_driver_data = {
.clk_driver = "clk-mt6797-mm",
};
static const struct mtk_mmsys_driver_data mt8167_mmsys_driver_data = {
.clk_driver = "clk-mt8167-mm",
.routes = mt8167_mmsys_routing_table,
.num_routes = ARRAY_SIZE(mt8167_mmsys_routing_table),
};
static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
.clk_driver = "clk-mt8173-mm",
.routes = mmsys_default_routing_table,
.num_routes = ARRAY_SIZE(mmsys_default_routing_table),
};
static const struct mtk_mmsys_driver_data mt8183_mmsys_driver_data = {
.clk_driver = "clk-mt8183-mm",
.routes = mmsys_mt8183_routing_table,
.num_routes = ARRAY_SIZE(mmsys_mt8183_routing_table),
};
static const struct mtk_mmsys_driver_data mt8192_mmsys_driver_data = {
.clk_driver = "clk-mt8192-mm",
.routes = mmsys_mt8192_routing_table,
.num_routes = ARRAY_SIZE(mmsys_mt8192_routing_table),
};
static const struct mtk_mmsys_driver_data mt8365_mmsys_driver_data = {
.clk_driver = "clk-mt8365-mm",
.routes = mt8365_mmsys_routing_table,
.num_routes = ARRAY_SIZE(mt8365_mmsys_routing_table),
};
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,
enum mtk_ddp_comp_id cur,
enum mtk_ddp_comp_id next)
{
struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
const struct mtk_mmsys_routes *routes = mmsys->data->routes;
u32 reg;
int i;
for (i = 0; i < mmsys->data->num_routes; i++)
if (cur == routes[i].from_comp && next == routes[i].to_comp) {
reg = readl_relaxed(mmsys->regs + routes[i].addr);
reg &= ~routes[i].mask;
reg |= routes[i].val;
writel_relaxed(reg, mmsys->regs + routes[i].addr);
}
}
EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_connect);
void mtk_mmsys_ddp_disconnect(struct device *dev,
enum mtk_ddp_comp_id cur,
enum mtk_ddp_comp_id next)
{
struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
const struct mtk_mmsys_routes *routes = mmsys->data->routes;
u32 reg;
int i;
for (i = 0; i < mmsys->data->num_routes; i++)
if (cur == routes[i].from_comp && next == routes[i].to_comp) {
reg = readl_relaxed(mmsys->regs + routes[i].addr);
reg &= ~routes[i].mask;
writel_relaxed(reg, mmsys->regs + routes[i].addr);
}
}
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;
struct platform_device *clks;
struct platform_device *drm;
struct mtk_mmsys *mmsys;
int ret;
mmsys = devm_kzalloc(dev, sizeof(*mmsys), GFP_KERNEL);
if (!mmsys)
return -ENOMEM;
mmsys->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mmsys->regs)) {
ret = PTR_ERR(mmsys->regs);
dev_err(dev, "Failed to ioremap mmsys registers: %d\n", ret);
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);
clks = platform_device_register_data(&pdev->dev, mmsys->data->clk_driver,
PLATFORM_DEVID_AUTO, NULL, 0);
if (IS_ERR(clks))
return PTR_ERR(clks);
drm = platform_device_register_data(&pdev->dev, "mediatek-drm",
PLATFORM_DEVID_AUTO, NULL, 0);
if (IS_ERR(drm)) {
platform_device_unregister(clks);
return PTR_ERR(drm);
}
return 0;
}
static const struct of_device_id of_match_mtk_mmsys[] = {
{
.compatible = "mediatek,mt2701-mmsys",
.data = &mt2701_mmsys_driver_data,
},
{
.compatible = "mediatek,mt2712-mmsys",
.data = &mt2712_mmsys_driver_data,
},
{
.compatible = "mediatek,mt6779-mmsys",
.data = &mt6779_mmsys_driver_data,
},
{
.compatible = "mediatek,mt6797-mmsys",
.data = &mt6797_mmsys_driver_data,
},
{
.compatible = "mediatek,mt8167-mmsys",
.data = &mt8167_mmsys_driver_data,
},
{
.compatible = "mediatek,mt8173-mmsys",
.data = &mt8173_mmsys_driver_data,
},
{
.compatible = "mediatek,mt8183-mmsys",
.data = &mt8183_mmsys_driver_data,
},
{
.compatible = "mediatek,mt8192-mmsys",
.data = &mt8192_mmsys_driver_data,
},
{
.compatible = "mediatek,mt8365-mmsys",
.data = &mt8365_mmsys_driver_data,
},
{ }
};
static struct platform_driver mtk_mmsys_drv = {
.driver = {
.name = "mtk-mmsys",
.of_match_table = of_match_mtk_mmsys,
},
.probe = mtk_mmsys_probe,
};
builtin_platform_driver(mtk_mmsys_drv);