forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
97 lines
2.2 KiB
97 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Power off through MediaTek PMIC |
|
* |
|
* Copyright (C) 2018 MediaTek Inc. |
|
* |
|
* Author: Sean Wang <[email protected]> |
|
* |
|
*/ |
|
|
|
#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_MT6323, 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 <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|