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