1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun // Copyright (c) 2017-18 Linaro Limited
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #include <linux/delay.h>
5*4882a593Smuzhiyun #include <linux/errno.h>
6*4882a593Smuzhiyun #include <linux/kernel.h>
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/of.h>
9*4882a593Smuzhiyun #include <linux/of_platform.h>
10*4882a593Smuzhiyun #include <linux/platform_device.h>
11*4882a593Smuzhiyun #include <linux/reboot.h>
12*4882a593Smuzhiyun #include <linux/reboot-mode.h>
13*4882a593Smuzhiyun #include <linux/regmap.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define PON_SOFT_RB_SPARE 0x8f
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #define GEN1_REASON_SHIFT 2
18*4882a593Smuzhiyun #define GEN2_REASON_SHIFT 1
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun struct pm8916_pon {
21*4882a593Smuzhiyun struct device *dev;
22*4882a593Smuzhiyun struct regmap *regmap;
23*4882a593Smuzhiyun u32 baseaddr;
24*4882a593Smuzhiyun struct reboot_mode_driver reboot_mode;
25*4882a593Smuzhiyun long reason_shift;
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
pm8916_reboot_mode_write(struct reboot_mode_driver * reboot,unsigned int magic)28*4882a593Smuzhiyun static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
29*4882a593Smuzhiyun unsigned int magic)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun struct pm8916_pon *pon = container_of
32*4882a593Smuzhiyun (reboot, struct pm8916_pon, reboot_mode);
33*4882a593Smuzhiyun int ret;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun ret = regmap_update_bits(pon->regmap,
36*4882a593Smuzhiyun pon->baseaddr + PON_SOFT_RB_SPARE,
37*4882a593Smuzhiyun GENMASK(7, pon->reason_shift),
38*4882a593Smuzhiyun magic << pon->reason_shift);
39*4882a593Smuzhiyun if (ret < 0)
40*4882a593Smuzhiyun dev_err(pon->dev, "update reboot mode bits failed\n");
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun return ret;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
pm8916_pon_probe(struct platform_device * pdev)45*4882a593Smuzhiyun static int pm8916_pon_probe(struct platform_device *pdev)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun struct pm8916_pon *pon;
48*4882a593Smuzhiyun int error;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);
51*4882a593Smuzhiyun if (!pon)
52*4882a593Smuzhiyun return -ENOMEM;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun pon->dev = &pdev->dev;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun pon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
57*4882a593Smuzhiyun if (!pon->regmap) {
58*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to locate regmap\n");
59*4882a593Smuzhiyun return -ENODEV;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun error = of_property_read_u32(pdev->dev.of_node, "reg",
63*4882a593Smuzhiyun &pon->baseaddr);
64*4882a593Smuzhiyun if (error)
65*4882a593Smuzhiyun return error;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun pon->reboot_mode.dev = &pdev->dev;
68*4882a593Smuzhiyun pon->reason_shift = (long)of_device_get_match_data(&pdev->dev);
69*4882a593Smuzhiyun pon->reboot_mode.write = pm8916_reboot_mode_write;
70*4882a593Smuzhiyun error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);
71*4882a593Smuzhiyun if (error) {
72*4882a593Smuzhiyun dev_err(&pdev->dev, "can't register reboot mode\n");
73*4882a593Smuzhiyun return error;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun platform_set_drvdata(pdev, pon);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun return devm_of_platform_populate(&pdev->dev);
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static const struct of_device_id pm8916_pon_id_table[] = {
82*4882a593Smuzhiyun { .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT },
83*4882a593Smuzhiyun { .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT },
84*4882a593Smuzhiyun { .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT },
85*4882a593Smuzhiyun { }
86*4882a593Smuzhiyun };
87*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun static struct platform_driver pm8916_pon_driver = {
90*4882a593Smuzhiyun .probe = pm8916_pon_probe,
91*4882a593Smuzhiyun .driver = {
92*4882a593Smuzhiyun .name = "pm8916-pon",
93*4882a593Smuzhiyun .of_match_table = of_match_ptr(pm8916_pon_id_table),
94*4882a593Smuzhiyun },
95*4882a593Smuzhiyun };
96*4882a593Smuzhiyun module_platform_driver(pm8916_pon_driver);
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun MODULE_DESCRIPTION("pm8916 Power On driver");
99*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
100