117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2019 MediaTek Inc.
|
||
|
|
* Author Freddy Hsin <freddy.hsin@mediatek.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/reboot.h>
|
||
|
|
#include <linux/regmap.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <linux/reboot-mode.h>
|
||
|
|
|
||
|
|
static const struct regmap_config mtk_regmap_config = {
|
||
|
|
.reg_bits = 32,
|
||
|
|
.val_bits = 32,
|
||
|
|
.reg_stride = 4,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct mtk_reboot_mode {
|
||
|
|
struct regmap *map;
|
||
|
|
struct reboot_mode_driver reboot;
|
||
|
|
u32 offset;
|
||
|
|
u32 mask;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int mtk_reboot_mode_write(struct reboot_mode_driver *reboot,
|
||
|
|
unsigned int magic)
|
||
|
|
{
|
||
|
|
struct mtk_reboot_mode *mtk_rbm;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
mtk_rbm = container_of(reboot, struct mtk_reboot_mode, reboot);
|
||
|
|
|
||
|
|
ret = regmap_update_bits(mtk_rbm->map, mtk_rbm->offset,
|
||
|
|
mtk_rbm->mask, magic);
|
||
|
|
if (ret < 0)
|
||
|
|
dev_info(reboot->dev, "update reboot mode bits failed\n");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mtk_regmap_lookup_by_phandle(struct device *dev,
|
||
|
|
struct mtk_reboot_mode *mtk_rbm)
|
||
|
|
{
|
||
|
|
struct device_node *toprgu_np;
|
||
|
|
struct device_node *np = dev->of_node;
|
||
|
|
void __iomem *base;
|
||
|
|
|
||
|
|
toprgu_np = of_parse_phandle(np, "regmap", 0);
|
||
|
|
|
||
|
|
if (!of_device_is_compatible(toprgu_np, "mediatek,toprgu"))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
base = of_iomap(toprgu_np, 0);
|
||
|
|
if (IS_ERR(base))
|
||
|
|
return PTR_ERR(base);
|
||
|
|
|
||
|
|
mtk_rbm->map = devm_regmap_init_mmio(dev, base,
|
||
|
|
&mtk_regmap_config);
|
||
|
|
return PTR_ERR_OR_ZERO(mtk_rbm->map);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mtk_reboot_mode_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct mtk_reboot_mode *mtk_rbm;
|
||
|
|
|
||
|
|
mtk_rbm = devm_kzalloc(&pdev->dev, sizeof(*mtk_rbm), GFP_KERNEL);
|
||
|
|
if (!mtk_rbm)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
mtk_rbm->reboot.dev = &pdev->dev;
|
||
|
|
mtk_rbm->reboot.write = mtk_reboot_mode_write;
|
||
|
|
mtk_rbm->mask = 0xf;
|
||
|
|
|
||
|
|
ret = mtk_regmap_lookup_by_phandle(&pdev->dev, mtk_rbm);
|
||
|
|
if (ret) {
|
||
|
|
dev_info(&pdev->dev, "Couldn't create the toprgu regmap\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (of_property_read_u32(pdev->dev.of_node, "offset",
|
||
|
|
&mtk_rbm->offset))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
of_property_read_u32(pdev->dev.of_node, "mask", &mtk_rbm->mask);
|
||
|
|
|
||
|
|
ret = devm_reboot_mode_register(&pdev->dev, &mtk_rbm->reboot);
|
||
|
|
if (ret)
|
||
|
|
dev_info(&pdev->dev, "can't register reboot mode\n");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id mtk_reboot_mode_of_match[] = {
|
||
|
|
{ .compatible = "toprgu-reboot-mode" },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, mtk_reboot_mode_of_match);
|
||
|
|
|
||
|
|
static struct platform_driver mtk_reboot_mode_driver = {
|
||
|
|
.probe = mtk_reboot_mode_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "toprgu-reboot-mode",
|
||
|
|
.of_match_table = mtk_reboot_mode_of_match,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(mtk_reboot_mode_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Freddy Hsin <freddy.hsin@mediatek.com>");
|
||
|
|
MODULE_DESCRIPTION("Mediatek reboot mode driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|