cregit-Linux how code gets into the kernel

Release 4.7 drivers/power/reset/zx-reboot.c

/*
 * ZTE zx296702 SoC reset code
 *
 * Copyright (c) 2015 Linaro Ltd.
 *
 * Author: Jun Nie <jun.nie@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>


static void __iomem *base;

static void __iomem *pcu_base;


static int zx_restart_handler(struct notifier_block *this, unsigned long mode, void *cmd) { writel_relaxed(1, base + 0xb0); writel_relaxed(1, pcu_base + 0x34); mdelay(50); pr_emerg("Unable to restart system\n"); return NOTIFY_DONE; }

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jun niejun nie50100.00%1100.00%
Total50100.00%1100.00%

static struct notifier_block zx_restart_nb = { .notifier_call = zx_restart_handler, .priority = 128, };
static int zx_reboot_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; int err; base = of_iomap(np, 0); if (!base) { WARN(1, "failed to map base address"); return -ENODEV; } np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu"); pcu_base = of_iomap(np, 0); if (!pcu_base) { iounmap(base); WARN(1, "failed to map pcu_base address"); return -ENODEV; } err = register_restart_handler(&zx_restart_nb); if (err) dev_err(&pdev->dev, "Register restart handler failed(err=%d)\n", err); return err; }

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jun niejun nie122100.00%1100.00%
Total122100.00%1100.00%

static const struct of_device_id zx_reboot_of_match[] = { { .compatible = "zte,sysctrl" }, {} }; static struct platform_driver zx_reboot_driver = { .probe = zx_reboot_probe, .driver = { .name = "zx-reboot", .of_match_table = zx_reboot_of_match, }, }; module_platform_driver(zx_reboot_driver);

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jun niejun nie273100.00%1100.00%
Total273100.00%1100.00%
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