1a59d1b8e0
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
// 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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