// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
|
*/
|
|
#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/mfd/syscon.h>
|
#include <linux/reboot-mode.h>
|
|
struct syscon_reboot_mode {
|
struct regmap *map;
|
struct reboot_mode_driver reboot;
|
u32 offset;
|
u32 mask;
|
};
|
|
static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot,
|
unsigned int magic)
|
{
|
struct syscon_reboot_mode *syscon_rbm;
|
int ret;
|
|
syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);
|
|
ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset,
|
syscon_rbm->mask, magic);
|
if (ret < 0)
|
dev_err(reboot->dev, "update reboot mode bits failed\n");
|
|
return ret;
|
}
|
|
static int syscon_reboot_mode_read(struct reboot_mode_driver *reboot)
|
{
|
struct syscon_reboot_mode *syscon_rbm;
|
u32 val = 0;
|
|
syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);
|
regmap_read(syscon_rbm->map, syscon_rbm->offset, &val);
|
|
return val;
|
}
|
|
static int syscon_reboot_mode_probe(struct platform_device *pdev)
|
{
|
int ret;
|
struct syscon_reboot_mode *syscon_rbm;
|
|
syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL);
|
if (!syscon_rbm)
|
return -ENOMEM;
|
|
syscon_rbm->reboot.dev = &pdev->dev;
|
syscon_rbm->reboot.write = syscon_reboot_mode_write;
|
syscon_rbm->reboot.read = syscon_reboot_mode_read;
|
syscon_rbm->mask = 0xffffffff;
|
|
syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
|
if (IS_ERR(syscon_rbm->map))
|
return PTR_ERR(syscon_rbm->map);
|
|
if (of_property_read_u32(pdev->dev.of_node, "offset",
|
&syscon_rbm->offset))
|
return -EINVAL;
|
|
of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask);
|
|
ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot);
|
if (ret)
|
dev_err(&pdev->dev, "can't register reboot mode\n");
|
|
return ret;
|
}
|
|
static const struct of_device_id syscon_reboot_mode_of_match[] = {
|
{ .compatible = "syscon-reboot-mode" },
|
{}
|
};
|
MODULE_DEVICE_TABLE(of, syscon_reboot_mode_of_match);
|
|
static struct platform_driver syscon_reboot_mode_driver = {
|
.probe = syscon_reboot_mode_probe,
|
.driver = {
|
.name = "syscon-reboot-mode",
|
.of_match_table = syscon_reboot_mode_of_match,
|
},
|
};
|
module_platform_driver(syscon_reboot_mode_driver);
|
|
MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
|
MODULE_DESCRIPTION("SYSCON reboot mode driver");
|
MODULE_LICENSE("GPL v2");
|
