// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2017-18 Linaro Limited #include <linux/delay.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/reboot-mode.h> #include <linux/regmap.h> #define PON_SOFT_RB_SPARE 0x8f #define GEN1_REASON_SHIFT 2 #define GEN2_REASON_SHIFT 1 struct pm8916_pon { struct device *dev; struct regmap *regmap; u32 baseaddr; struct reboot_mode_driver reboot_mode; long reason_shift; }; static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot, unsigned int magic) { struct pm8916_pon *pon = container_of (reboot, struct pm8916_pon, reboot_mode); int ret; ret = regmap_update_bits(pon->regmap, pon->baseaddr + PON_SOFT_RB_SPARE, GENMASK(7, pon->reason_shift), magic << pon->reason_shift); if (ret < 0) dev_err(pon->dev, "update reboot mode bits failed\n"); return ret; } static int pm8916_pon_probe(struct platform_device *pdev) { struct pm8916_pon *pon; int error; pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL); if (!pon) return -ENOMEM; pon->dev = &pdev->dev; pon->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!pon->regmap) { dev_err(&pdev->dev, "failed to locate regmap\n"); return -ENODEV; } error = of_property_read_u32(pdev->dev.of_node, "reg", &pon->baseaddr); if (error) return error; pon->reboot_mode.dev = &pdev->dev; pon->reason_shift = (long)of_device_get_match_data(&pdev->dev); pon->reboot_mode.write = pm8916_reboot_mode_write; error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode); if (error) { dev_err(&pdev->dev, "can't register reboot mode\n"); return error; } platform_set_drvdata(pdev, pon); return devm_of_platform_populate(&pdev->dev); } static const struct of_device_id pm8916_pon_id_table[] = { { .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT }, { .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT }, { .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT }, { } }; MODULE_DEVICE_TABLE(of, pm8916_pon_id_table); static struct platform_driver pm8916_pon_driver = { .probe = pm8916_pon_probe, .driver = { .name = "pm8916-pon", .of_match_table = of_match_ptr(pm8916_pon_id_table), }, }; module_platform_driver(pm8916_pon_driver); MODULE_DESCRIPTION("pm8916 Power On driver"); MODULE_LICENSE("GPL v2");