linux/drivers/power/reset/hisi-reboot.c
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   1/*
   2 * Hisilicon SoC reset code
   3 *
   4 * Copyright (c) 2014 Hisilicon Ltd.
   5 * Copyright (c) 2014 Linaro Ltd.
   6 *
   7 * Author: Haojian Zhuang <haojian.zhuang@linaro.org>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/delay.h>
  15#include <linux/io.h>
  16#include <linux/module.h>
  17#include <linux/notifier.h>
  18#include <linux/of_address.h>
  19#include <linux/platform_device.h>
  20#include <linux/reboot.h>
  21
  22#include <asm/proc-fns.h>
  23
  24static void __iomem *base;
  25static u32 reboot_offset;
  26
  27static int hisi_restart_handler(struct notifier_block *this,
  28                                unsigned long mode, void *cmd)
  29{
  30        writel_relaxed(0xdeadbeef, base + reboot_offset);
  31
  32        while (1)
  33                cpu_do_idle();
  34
  35        return NOTIFY_DONE;
  36}
  37
  38static struct notifier_block hisi_restart_nb = {
  39        .notifier_call = hisi_restart_handler,
  40        .priority = 128,
  41};
  42
  43static int hisi_reboot_probe(struct platform_device *pdev)
  44{
  45        struct device_node *np = pdev->dev.of_node;
  46        int err;
  47
  48        base = of_iomap(np, 0);
  49        if (!base) {
  50                WARN(1, "failed to map base address");
  51                return -ENODEV;
  52        }
  53
  54        if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) {
  55                pr_err("failed to find reboot-offset property\n");
  56                return -EINVAL;
  57        }
  58
  59        err = register_restart_handler(&hisi_restart_nb);
  60        if (err)
  61                dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n",
  62                        err);
  63
  64        return err;
  65}
  66
  67static struct of_device_id hisi_reboot_of_match[] = {
  68        { .compatible = "hisilicon,sysctrl" },
  69        {}
  70};
  71
  72static struct platform_driver hisi_reboot_driver = {
  73        .probe = hisi_reboot_probe,
  74        .driver = {
  75                .name = "hisi-reboot",
  76                .of_match_table = hisi_reboot_of_match,
  77        },
  78};
  79module_platform_driver(hisi_reboot_driver);
  80
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