xref: /kernel/linux/linux-5.10/arch/arm/include/asm/firmware.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Samsung Electronics.
 * Kyungmin Park <kyungmin.park@samsung.com>
 * Tomasz Figa <t.figa@samsung.com>
 */

#ifndef __ASM_ARM_FIRMWARE_H
#define __ASM_ARM_FIRMWARE_H

#include <linux/bug.h>

/*
 * struct firmware_ops
 *
 * A structure to specify available firmware operations.
 *
 * A filled up structure can be registered with register_firmware_ops().
 */
struct firmware_ops {
	/*
	 * Inform the firmware we intend to enter CPU idle mode
	 */
	int (*prepare_idle)(unsigned long mode);
	/*
	 * Enters CPU idle mode
	 */
	int (*do_idle)(unsigned long mode);
	/*
	 * Sets boot address of specified physical CPU
	 */
	int (*set_cpu_boot_addr)(int cpu, unsigned long boot_addr);
	/*
	 * Gets boot address of specified physical CPU
	 */
	int (*get_cpu_boot_addr)(int cpu, unsigned long *boot_addr);
	/*
	 * Boots specified physical CPU
	 */
	int (*cpu_boot)(int cpu);
	/*
	 * Initializes L2 cache
	 */
	int (*l2x0_init)(void);
	/*
	 * Enter system-wide suspend.
	 */
	int (*suspend)(void);
	/*
	 * Restore state of privileged hardware after system-wide suspend.
	 */
	int (*resume)(void);
};

/* Global pointer for current firmware_ops structure, can't be NULL. */
extern const struct firmware_ops *firmware_ops;

/*
 * call_firmware_op(op, ...)
 *
 * Checks if firmware operation is present and calls it,
 * otherwise returns -ENOSYS
 */
#define call_firmware_op(op, ...)					\
	((firmware_ops->op) ? firmware_ops->op(__VA_ARGS__) : (-ENOSYS))

/*
 * register_firmware_ops(ops)
 *
 * A function to register platform firmware_ops struct.
 */
static inline void register_firmware_ops(const struct firmware_ops *ops)
{
	BUG_ON(!ops);

	firmware_ops = ops;
}

#endif