98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Power off through MediaTek PMIC
|
|
*
|
|
* Copyright (C) 2018 MediaTek Inc.
|
|
*
|
|
* Author: Sean Wang <sean.wang@mediatek.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/mfd/mt6397/core.h>
|
|
#include <linux/mfd/mt6397/rtc.h>
|
|
|
|
struct mt6323_pwrc {
|
|
struct device *dev;
|
|
struct regmap *regmap;
|
|
u32 base;
|
|
};
|
|
|
|
static struct mt6323_pwrc *mt_pwrc;
|
|
|
|
static void mt6323_do_pwroff(void)
|
|
{
|
|
struct mt6323_pwrc *pwrc = mt_pwrc;
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY);
|
|
regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR, 1);
|
|
|
|
ret = regmap_read_poll_timeout(pwrc->regmap,
|
|
pwrc->base + RTC_BBPU, val,
|
|
!(val & RTC_BBPU_CBUSY),
|
|
MTK_RTC_POLL_DELAY_US,
|
|
MTK_RTC_POLL_TIMEOUT);
|
|
if (ret)
|
|
dev_err(pwrc->dev, "failed to write BBPU: %d\n", ret);
|
|
|
|
/* Wait some time until system down, otherwise, notice with a warn */
|
|
mdelay(1000);
|
|
|
|
WARN_ONCE(1, "Unable to power off system\n");
|
|
}
|
|
|
|
static int mt6323_pwrc_probe(struct platform_device *pdev)
|
|
{
|
|
struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
|
|
struct mt6323_pwrc *pwrc;
|
|
struct resource *res;
|
|
|
|
pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
|
|
if (!pwrc)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
pwrc->base = res->start;
|
|
pwrc->regmap = mt6397_chip->regmap;
|
|
pwrc->dev = &pdev->dev;
|
|
mt_pwrc = pwrc;
|
|
|
|
pm_power_off = &mt6323_do_pwroff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mt6323_pwrc_remove(struct platform_device *pdev)
|
|
{
|
|
if (pm_power_off == &mt6323_do_pwroff)
|
|
pm_power_off = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id mt6323_pwrc_dt_match[] = {
|
|
{ .compatible = "mediatek,mt6323-pwrc" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match);
|
|
|
|
static struct platform_driver mt6323_pwrc_driver = {
|
|
.probe = mt6323_pwrc_probe,
|
|
.remove = mt6323_pwrc_remove,
|
|
.driver = {
|
|
.name = "mt6323-pwrc",
|
|
.of_match_table = mt6323_pwrc_dt_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(mt6323_pwrc_driver);
|
|
|
|
MODULE_DESCRIPTION("Poweroff driver for MT6323 PMIC");
|
|
MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
|
|
MODULE_LICENSE("GPL v2");
|