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1// SPDX-License-Identifier: GPL-2.02// Copyright (c) 2017-18 Linaro Limited3 4#include <linux/delay.h>5#include <linux/errno.h>6#include <linux/kernel.h>7#include <linux/module.h>8#include <linux/of.h>9#include <linux/of_platform.h>10#include <linux/platform_device.h>11#include <linux/reboot.h>12#include <linux/reboot-mode.h>13#include <linux/regmap.h>14 15#define PON_SOFT_RB_SPARE 0x8f16 17#define GEN1_REASON_SHIFT 218#define GEN2_REASON_SHIFT 119 20#define NO_REASON_SHIFT 021 22struct pm8916_pon {23 struct device *dev;24 struct regmap *regmap;25 u32 baseaddr;26 struct reboot_mode_driver reboot_mode;27 long reason_shift;28};29 30static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,31 unsigned int magic)32{33 struct pm8916_pon *pon = container_of34 (reboot, struct pm8916_pon, reboot_mode);35 int ret;36 37 ret = regmap_update_bits(pon->regmap,38 pon->baseaddr + PON_SOFT_RB_SPARE,39 GENMASK(7, pon->reason_shift),40 magic << pon->reason_shift);41 if (ret < 0)42 dev_err(pon->dev, "update reboot mode bits failed\n");43 44 return ret;45}46 47static int pm8916_pon_probe(struct platform_device *pdev)48{49 struct pm8916_pon *pon;50 long reason_shift;51 int error;52 53 pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);54 if (!pon)55 return -ENOMEM;56 57 pon->dev = &pdev->dev;58 59 pon->regmap = dev_get_regmap(pdev->dev.parent, NULL);60 if (!pon->regmap) {61 dev_err(&pdev->dev, "failed to locate regmap\n");62 return -ENODEV;63 }64 65 error = of_property_read_u32(pdev->dev.of_node, "reg",66 &pon->baseaddr);67 if (error)68 return error;69 70 reason_shift = (long)of_device_get_match_data(&pdev->dev);71 72 if (reason_shift != NO_REASON_SHIFT) {73 pon->reboot_mode.dev = &pdev->dev;74 pon->reason_shift = reason_shift;75 pon->reboot_mode.write = pm8916_reboot_mode_write;76 error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);77 if (error) {78 dev_err(&pdev->dev, "can't register reboot mode\n");79 return error;80 }81 }82 83 platform_set_drvdata(pdev, pon);84 85 return devm_of_platform_populate(&pdev->dev);86}87 88static const struct of_device_id pm8916_pon_id_table[] = {89 { .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT },90 { .compatible = "qcom,pm8941-pon", .data = (void *)NO_REASON_SHIFT },91 { .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT },92 { .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT },93 { .compatible = "qcom,pmk8350-pon", .data = (void *)GEN2_REASON_SHIFT },94 { }95};96MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);97 98static struct platform_driver pm8916_pon_driver = {99 .probe = pm8916_pon_probe,100 .driver = {101 .name = "pm8916-pon",102 .of_match_table = pm8916_pon_id_table,103 },104};105module_platform_driver(pm8916_pon_driver);106 107MODULE_DESCRIPTION("pm8916 Power On driver");108MODULE_LICENSE("GPL v2");109