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88 lines
2.0 KiB
88 lines
2.0 KiB
// 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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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