Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * AppliedMicro X-Gene SoC Reboot Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (c) 2013, Applied Micro Circuits Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Author: Feng Kan <fkan@apm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Author: Loc Ho <lho@apm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * This driver provides system reboot functionality for APM X-Gene SoC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * For system shutdown, this is board specify. If a board designer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * implements GPIO shutdown, use the gpio-poweroff.c driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct xgene_reboot_context {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	void *csr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	u32 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	struct notifier_block restart_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int xgene_restart_handler(struct notifier_block *this,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 				 unsigned long mode, void *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	struct xgene_reboot_context *ctx =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		container_of(this, struct xgene_reboot_context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 			     restart_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	/* Issue the reboot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	writel(ctx->mask, ctx->csr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	mdelay(1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	dev_emerg(ctx->dev, "Unable to restart system\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static int xgene_reboot_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	struct xgene_reboot_context *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	if (!ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	ctx->csr = of_iomap(dev->of_node, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	if (!ctx->csr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		dev_err(dev, "can not map resource\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	if (of_property_read_u32(dev->of_node, "mask", &ctx->mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		ctx->mask = 0xFFFFFFFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	ctx->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	ctx->restart_handler.notifier_call = xgene_restart_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	ctx->restart_handler.priority = 128;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	err = register_restart_handler(&ctx->restart_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		iounmap(ctx->csr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 		dev_err(dev, "cannot register restart handler (err=%d)\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static const struct of_device_id xgene_reboot_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	{ .compatible = "apm,xgene-reboot" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	{}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static struct platform_driver xgene_reboot_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	.probe = xgene_reboot_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 		.name = "xgene-reboot",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		.of_match_table = xgene_reboot_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static int __init xgene_reboot_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) 	return platform_driver_register(&xgene_reboot_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) device_initcall(xgene_reboot_init);