// SPDX-License-Identifier: GPL-2.0
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/*
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* Renesas R-Mobile Reset Driver
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*
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* Copyright (C) 2014 Glider bvba
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <linux/reboot.h>
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/* SYSC Register Bank 2 */
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#define RESCNT2 0x20 /* Reset Control Register 2 */
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/* Reset Control Register 2 */
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#define RESCNT2_PRES 0x80000000 /* Soft power-on reset */
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static void __iomem *sysc_base2;
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static int rmobile_reset_handler(struct notifier_block *this,
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unsigned long mode, void *cmd)
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{
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pr_debug("%s %lu\n", __func__, mode);
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/* Let's assume we have acquired the HPB semaphore */
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writel(RESCNT2_PRES, sysc_base2 + RESCNT2);
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return NOTIFY_DONE;
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}
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static struct notifier_block rmobile_reset_nb = {
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.notifier_call = rmobile_reset_handler,
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.priority = 192,
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};
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static int rmobile_reset_probe(struct platform_device *pdev)
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{
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int error;
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sysc_base2 = of_iomap(pdev->dev.of_node, 1);
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if (!sysc_base2)
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return -ENODEV;
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error = register_restart_handler(&rmobile_reset_nb);
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if (error) {
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dev_err(&pdev->dev,
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"cannot register restart handler (err=%d)\n", error);
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goto fail_unmap;
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}
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return 0;
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fail_unmap:
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iounmap(sysc_base2);
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return error;
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}
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static int rmobile_reset_remove(struct platform_device *pdev)
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{
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unregister_restart_handler(&rmobile_reset_nb);
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iounmap(sysc_base2);
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return 0;
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}
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static const struct of_device_id rmobile_reset_of_match[] = {
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{ .compatible = "renesas,sysc-rmobile", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, rmobile_reset_of_match);
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static struct platform_driver rmobile_reset_driver = {
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.probe = rmobile_reset_probe,
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.remove = rmobile_reset_remove,
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.driver = {
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.name = "rmobile_reset",
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.of_match_table = rmobile_reset_of_match,
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},
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};
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module_platform_driver(rmobile_reset_driver);
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MODULE_DESCRIPTION("Renesas R-Mobile Reset Driver");
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MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
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MODULE_LICENSE("GPL v2");
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