| Josef Friedl | d28c74c | 2019-09-10 09:04:44 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Power off through MediaTek PMIC |
| 4 | * |
| 5 | * Copyright (C) 2018 MediaTek Inc. |
| 6 | * |
| 7 | * Author: Sean Wang <sean.wang@mediatek.com> |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <linux/err.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/mfd/mt6397/core.h> |
| 16 | #include <linux/mfd/mt6397/rtc.h> |
| 17 | |
| 18 | struct mt6323_pwrc { |
| 19 | struct device *dev; |
| 20 | struct regmap *regmap; |
| 21 | u32 base; |
| 22 | }; |
| 23 | |
| 24 | static struct mt6323_pwrc *mt_pwrc; |
| 25 | |
| 26 | static void mt6323_do_pwroff(void) |
| 27 | { |
| 28 | struct mt6323_pwrc *pwrc = mt_pwrc; |
| 29 | unsigned int val; |
| 30 | int ret; |
| 31 | |
| 32 | regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY); |
| Ran Bi | 29ee400 | 2020-04-21 11:00:11 +0800 | [diff] [blame] | 33 | regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR_MT6323, 1); |
| Josef Friedl | d28c74c | 2019-09-10 09:04:44 +0200 | [diff] [blame] | 34 | |
| 35 | ret = regmap_read_poll_timeout(pwrc->regmap, |
| 36 | pwrc->base + RTC_BBPU, val, |
| 37 | !(val & RTC_BBPU_CBUSY), |
| 38 | MTK_RTC_POLL_DELAY_US, |
| 39 | MTK_RTC_POLL_TIMEOUT); |
| 40 | if (ret) |
| 41 | dev_err(pwrc->dev, "failed to write BBPU: %d\n", ret); |
| 42 | |
| 43 | /* Wait some time until system down, otherwise, notice with a warn */ |
| 44 | mdelay(1000); |
| 45 | |
| 46 | WARN_ONCE(1, "Unable to power off system\n"); |
| 47 | } |
| 48 | |
| 49 | static int mt6323_pwrc_probe(struct platform_device *pdev) |
| 50 | { |
| 51 | struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent); |
| 52 | struct mt6323_pwrc *pwrc; |
| 53 | struct resource *res; |
| 54 | |
| 55 | pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL); |
| 56 | if (!pwrc) |
| 57 | return -ENOMEM; |
| 58 | |
| 59 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 60 | pwrc->base = res->start; |
| 61 | pwrc->regmap = mt6397_chip->regmap; |
| 62 | pwrc->dev = &pdev->dev; |
| 63 | mt_pwrc = pwrc; |
| 64 | |
| 65 | pm_power_off = &mt6323_do_pwroff; |
| 66 | |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | static int mt6323_pwrc_remove(struct platform_device *pdev) |
| 71 | { |
| 72 | if (pm_power_off == &mt6323_do_pwroff) |
| 73 | pm_power_off = NULL; |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static const struct of_device_id mt6323_pwrc_dt_match[] = { |
| 79 | { .compatible = "mediatek,mt6323-pwrc" }, |
| 80 | {}, |
| 81 | }; |
| 82 | MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match); |
| 83 | |
| 84 | static struct platform_driver mt6323_pwrc_driver = { |
| 85 | .probe = mt6323_pwrc_probe, |
| 86 | .remove = mt6323_pwrc_remove, |
| 87 | .driver = { |
| 88 | .name = "mt6323-pwrc", |
| 89 | .of_match_table = mt6323_pwrc_dt_match, |
| 90 | }, |
| 91 | }; |
| 92 | |
| 93 | module_platform_driver(mt6323_pwrc_driver); |
| 94 | |
| 95 | MODULE_DESCRIPTION("Poweroff driver for MT6323 PMIC"); |
| 96 | MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); |
| 97 | MODULE_LICENSE("GPL v2"); |