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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017-18 Linaro Limited
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/reboot-mode.h>
#include <linux/regmap.h>
#define PON_SOFT_RB_SPARE 0x8f
#define GEN1_REASON_SHIFT 2
#define GEN2_REASON_SHIFT 1
struct pm8916_pon {
struct device *dev;
struct regmap *regmap;
u32 baseaddr;
struct reboot_mode_driver reboot_mode;
long reason_shift;
};
static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
unsigned int magic)
{
struct pm8916_pon *pon = container_of
(reboot, struct pm8916_pon, reboot_mode);
int ret;
ret = regmap_update_bits(pon->regmap,
pon->baseaddr + PON_SOFT_RB_SPARE,
GENMASK(7, pon->reason_shift),
magic << pon->reason_shift);
if (ret < 0)
dev_err(pon->dev, "update reboot mode bits failed\n");
return ret;
}
static int pm8916_pon_probe(struct platform_device *pdev)
{
struct pm8916_pon *pon;
int error;
pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);
if (!pon)
return -ENOMEM;
pon->dev = &pdev->dev;
pon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!pon->regmap) {
dev_err(&pdev->dev, "failed to locate regmap\n");
return -ENODEV;
}
error = of_property_read_u32(pdev->dev.of_node, "reg",
&pon->baseaddr);
if (error)
return error;
pon->reboot_mode.dev = &pdev->dev;
pon->reason_shift = (long)of_device_get_match_data(&pdev->dev);
pon->reboot_mode.write = pm8916_reboot_mode_write;
error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);
if (error) {
dev_err(&pdev->dev, "can't register reboot mode\n");
return error;
}
platform_set_drvdata(pdev, pon);
return devm_of_platform_populate(&pdev->dev);
}
static const struct of_device_id pm8916_pon_id_table[] = {
{ .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT },
{ .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT },
{ .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT },
{ }
};
MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);
static struct platform_driver pm8916_pon_driver = {
.probe = pm8916_pon_probe,
.driver = {
.name = "pm8916-pon",
.of_match_table = of_match_ptr(pm8916_pon_id_table),
},
};
module_platform_driver(pm8916_pon_driver);
MODULE_DESCRIPTION("pm8916 Power On driver");
MODULE_LICENSE("GPL v2");
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