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80 lines
1.7 KiB
80 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* HiSilicon SoC reset code |
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* |
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* Copyright (c) 2014 HiSilicon Ltd. |
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* Copyright (c) 2014 Linaro Ltd. |
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* |
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* Author: Haojian Zhuang <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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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/reboot.h> |
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#include <asm/proc-fns.h> |
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static void __iomem *base; |
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static u32 reboot_offset; |
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static int hisi_restart_handler(struct notifier_block *this, |
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unsigned long mode, void *cmd) |
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{ |
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writel_relaxed(0xdeadbeef, base + reboot_offset); |
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while (1) |
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cpu_do_idle(); |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block hisi_restart_nb = { |
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.notifier_call = hisi_restart_handler, |
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.priority = 128, |
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}; |
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static int hisi_reboot_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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int err; |
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base = of_iomap(np, 0); |
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if (!base) { |
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WARN(1, "failed to map base address"); |
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return -ENODEV; |
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} |
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if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) { |
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pr_err("failed to find reboot-offset property\n"); |
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iounmap(base); |
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return -EINVAL; |
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} |
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err = register_restart_handler(&hisi_restart_nb); |
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if (err) { |
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dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n", |
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err); |
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iounmap(base); |
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} |
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return err; |
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} |
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static const struct of_device_id hisi_reboot_of_match[] = { |
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{ .compatible = "hisilicon,sysctrl" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, hisi_reboot_of_match); |
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static struct platform_driver hisi_reboot_driver = { |
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.probe = hisi_reboot_probe, |
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.driver = { |
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.name = "hisi-reboot", |
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.of_match_table = hisi_reboot_of_match, |
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}, |
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}; |
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module_platform_driver(hisi_reboot_driver);
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