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1// SPDX-License-Identifier: GPL-2.02/*3 * Renesas R-Mobile Reset Driver4 *5 * Copyright (C) 2014 Glider bvba6 */7 8#include <linux/io.h>9#include <linux/module.h>10#include <linux/notifier.h>11#include <linux/of_address.h>12#include <linux/platform_device.h>13#include <linux/printk.h>14#include <linux/reboot.h>15 16/* SYSC Register Bank 2 */17#define RESCNT2 0x20 /* Reset Control Register 2 */18 19/* Reset Control Register 2 */20#define RESCNT2_PRES 0x80000000 /* Soft power-on reset */21 22static int rmobile_reset_handler(struct sys_off_data *data)23{24 void __iomem *sysc_base2 = (void __iomem *)data->cb_data;25 26 /* Let's assume we have acquired the HPB semaphore */27 writel(RESCNT2_PRES, sysc_base2 + RESCNT2);28 29 return NOTIFY_DONE;30}31 32static int rmobile_reset_probe(struct platform_device *pdev)33{34 void __iomem *sysc_base2;35 int error;36 37 sysc_base2 = devm_platform_ioremap_resource(pdev, 1);38 if (IS_ERR(sysc_base2))39 return PTR_ERR(sysc_base2);40 41 error = devm_register_sys_off_handler(&pdev->dev,42 SYS_OFF_MODE_RESTART,43 SYS_OFF_PRIO_HIGH,44 rmobile_reset_handler,45 (__force void *)sysc_base2);46 if (error) {47 dev_err(&pdev->dev,48 "cannot register restart handler (err=%d)\n", error);49 return error;50 }51 52 return 0;53}54 55static const struct of_device_id rmobile_reset_of_match[] = {56 { .compatible = "renesas,sysc-rmobile", },57 { /* sentinel */ }58};59MODULE_DEVICE_TABLE(of, rmobile_reset_of_match);60 61static struct platform_driver rmobile_reset_driver = {62 .probe = rmobile_reset_probe,63 .driver = {64 .name = "rmobile_reset",65 .of_match_table = rmobile_reset_of_match,66 },67};68 69module_platform_driver(rmobile_reset_driver);70 71MODULE_DESCRIPTION("Renesas R-Mobile Reset Driver");72MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");73MODULE_LICENSE("GPL v2");74