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86 lines
1.8 KiB
86 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ZTE zx296702 SoC reset code |
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* |
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* Copyright (c) 2015 Linaro Ltd. |
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* |
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* Author: Jun Nie <[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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static void __iomem *base; |
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static void __iomem *pcu_base; |
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static int zx_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(1, base + 0xb0); |
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writel_relaxed(1, pcu_base + 0x34); |
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mdelay(50); |
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pr_emerg("Unable to restart system\n"); |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block zx_restart_nb = { |
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.notifier_call = zx_restart_handler, |
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.priority = 128, |
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}; |
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static int zx_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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np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu"); |
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pcu_base = of_iomap(np, 0); |
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of_node_put(np); |
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if (!pcu_base) { |
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iounmap(base); |
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WARN(1, "failed to map pcu_base address"); |
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return -ENODEV; |
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} |
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err = register_restart_handler(&zx_restart_nb); |
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if (err) { |
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iounmap(base); |
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iounmap(pcu_base); |
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dev_err(&pdev->dev, "Register restart handler failed(err=%d)\n", |
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err); |
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} |
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return err; |
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} |
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static const struct of_device_id zx_reboot_of_match[] = { |
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{ .compatible = "zte,sysctrl" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, zx_reboot_of_match); |
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static struct platform_driver zx_reboot_driver = { |
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.probe = zx_reboot_probe, |
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.driver = { |
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.name = "zx-reboot", |
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.of_match_table = zx_reboot_of_match, |
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}, |
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}; |
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module_platform_driver(zx_reboot_driver); |
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MODULE_DESCRIPTION("ZTE SoCs reset driver"); |
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MODULE_AUTHOR("Jun Nie <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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