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95 lines
2.2 KiB
95 lines
2.2 KiB
// 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 <[email protected]> |
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* Author: Loc Ho <[email protected]> |
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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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