96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AppliedMicro X-Gene SoC Reboot Driver
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*
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* Copyright (c) 2013, Applied Micro Circuits Corporation
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* Author: Feng Kan <fkan@apm.com>
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* Author: Loc Ho <lho@apm.com>
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*
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* This driver provides system reboot functionality for APM X-Gene SoC.
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* For system shutdown, this is board specify. If a board designer
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* implements GPIO shutdown, use the gpio-poweroff.c driver.
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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/notifier.h>
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#include <linux/of_device.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 <linux/stat.h>
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#include <linux/slab.h>
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struct xgene_reboot_context {
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struct device *dev;
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void *csr;
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u32 mask;
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struct notifier_block restart_handler;
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};
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static int xgene_restart_handler(struct notifier_block *this,
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unsigned long mode, void *cmd)
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{
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struct xgene_reboot_context *ctx =
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container_of(this, struct xgene_reboot_context,
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restart_handler);
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/* Issue the reboot */
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writel(ctx->mask, ctx->csr);
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mdelay(1000);
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dev_emerg(ctx->dev, "Unable to restart system\n");
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return NOTIFY_DONE;
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}
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static int xgene_reboot_probe(struct platform_device *pdev)
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{
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struct xgene_reboot_context *ctx;
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struct device *dev = &pdev->dev;
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int err;
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ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->csr = of_iomap(dev->of_node, 0);
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if (!ctx->csr) {
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dev_err(dev, "can not map resource\n");
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return -ENODEV;
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}
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if (of_property_read_u32(dev->of_node, "mask", &ctx->mask))
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ctx->mask = 0xFFFFFFFF;
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ctx->dev = dev;
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ctx->restart_handler.notifier_call = xgene_restart_handler;
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ctx->restart_handler.priority = 128;
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err = register_restart_handler(&ctx->restart_handler);
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if (err) {
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iounmap(ctx->csr);
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dev_err(dev, "cannot register restart handler (err=%d)\n", 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 xgene_reboot_of_match[] = {
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{ .compatible = "apm,xgene-reboot" },
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{}
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};
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static struct platform_driver xgene_reboot_driver = {
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.probe = xgene_reboot_probe,
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.driver = {
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.name = "xgene-reboot",
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.of_match_table = xgene_reboot_of_match,
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},
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};
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static int __init xgene_reboot_init(void)
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{
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return platform_driver_register(&xgene_reboot_driver);
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}
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device_initcall(xgene_reboot_init);
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