u-boot/drivers/sysreset/sysreset_psci.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
 */

#include <common.h>
#include <dm.h>
#include <sysreset.h>
#include <linux/errno.h>
#include <linux/psci.h>

static int psci_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
	unsigned long function_id;

	switch (type) {
	case SYSRESET_WARM:
	case SYSRESET_COLD:
		function_id = PSCI_0_2_FN_SYSTEM_RESET;
		break;
	case SYSRESET_POWER_OFF:
		function_id = PSCI_0_2_FN_SYSTEM_OFF;
		break;
	default:
		return -ENOSYS;
	}

	invoke_psci_fn(function_id, 0, 0, 0);

	return -EINPROGRESS;
}

static struct sysreset_ops psci_sysreset_ops = {
	.request = psci_sysreset_request,
};

U_BOOT_DRIVER(psci_sysreset) = {
	.name = "psci-sysreset",
	.id = UCLASS_SYSRESET,
	.ops = &psci_sysreset_ops,
};