1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Power off through MediaTek PMIC
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2018 MediaTek Inc.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Sean Wang <sean.wang@mediatek.com>
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/err.h>
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun #include <linux/of.h>
14*4882a593Smuzhiyun #include <linux/platform_device.h>
15*4882a593Smuzhiyun #include <linux/mfd/mt6397/core.h>
16*4882a593Smuzhiyun #include <linux/mfd/mt6397/rtc.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun struct mt6323_pwrc {
19*4882a593Smuzhiyun struct device *dev;
20*4882a593Smuzhiyun struct regmap *regmap;
21*4882a593Smuzhiyun u32 base;
22*4882a593Smuzhiyun };
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun static struct mt6323_pwrc *mt_pwrc;
25*4882a593Smuzhiyun
mt6323_do_pwroff(void)26*4882a593Smuzhiyun static void mt6323_do_pwroff(void)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct mt6323_pwrc *pwrc = mt_pwrc;
29*4882a593Smuzhiyun unsigned int val;
30*4882a593Smuzhiyun int ret;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY);
33*4882a593Smuzhiyun regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR_MT6323, 1);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun ret = regmap_read_poll_timeout(pwrc->regmap,
36*4882a593Smuzhiyun pwrc->base + RTC_BBPU, val,
37*4882a593Smuzhiyun !(val & RTC_BBPU_CBUSY),
38*4882a593Smuzhiyun MTK_RTC_POLL_DELAY_US,
39*4882a593Smuzhiyun MTK_RTC_POLL_TIMEOUT);
40*4882a593Smuzhiyun if (ret)
41*4882a593Smuzhiyun dev_err(pwrc->dev, "failed to write BBPU: %d\n", ret);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun /* Wait some time until system down, otherwise, notice with a warn */
44*4882a593Smuzhiyun mdelay(1000);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun WARN_ONCE(1, "Unable to power off system\n");
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
mt6323_pwrc_probe(struct platform_device * pdev)49*4882a593Smuzhiyun static int mt6323_pwrc_probe(struct platform_device *pdev)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
52*4882a593Smuzhiyun struct mt6323_pwrc *pwrc;
53*4882a593Smuzhiyun struct resource *res;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
56*4882a593Smuzhiyun if (!pwrc)
57*4882a593Smuzhiyun return -ENOMEM;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
60*4882a593Smuzhiyun if (!res)
61*4882a593Smuzhiyun return -EINVAL;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun pwrc->base = res->start;
64*4882a593Smuzhiyun pwrc->regmap = mt6397_chip->regmap;
65*4882a593Smuzhiyun pwrc->dev = &pdev->dev;
66*4882a593Smuzhiyun mt_pwrc = pwrc;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun pm_power_off = &mt6323_do_pwroff;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun return 0;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
mt6323_pwrc_remove(struct platform_device * pdev)73*4882a593Smuzhiyun static int mt6323_pwrc_remove(struct platform_device *pdev)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun if (pm_power_off == &mt6323_do_pwroff)
76*4882a593Smuzhiyun pm_power_off = NULL;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun return 0;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static const struct of_device_id mt6323_pwrc_dt_match[] = {
82*4882a593Smuzhiyun { .compatible = "mediatek,mt6323-pwrc" },
83*4882a593Smuzhiyun {},
84*4882a593Smuzhiyun };
85*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun static struct platform_driver mt6323_pwrc_driver = {
88*4882a593Smuzhiyun .probe = mt6323_pwrc_probe,
89*4882a593Smuzhiyun .remove = mt6323_pwrc_remove,
90*4882a593Smuzhiyun .driver = {
91*4882a593Smuzhiyun .name = "mt6323-pwrc",
92*4882a593Smuzhiyun .of_match_table = mt6323_pwrc_dt_match,
93*4882a593Smuzhiyun },
94*4882a593Smuzhiyun };
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun module_platform_driver(mt6323_pwrc_driver);
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun MODULE_DESCRIPTION("Poweroff driver for MT6323 PMIC");
99*4882a593Smuzhiyun MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
100*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
101