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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright (C) 2021-2024 Advanced Micro Devices, Inc.
*/
#ifndef _AMD_APML_H_
#define _AMD_APML_H_
#include <linux/types.h>
/* Mailbox data size for data_in and data_out */
#define AMD_SBI_MB_DATA_SIZE 4
struct apml_mbox_msg {
/*
* Mailbox Message ID
*/
__u32 cmd;
/*
* [0]...[3] mailbox 32bit input/output data
*/
__u32 mb_in_out;
/*
* Error code is returned in case of soft mailbox error
*/
__u32 fw_ret_code;
};
/*
* AMD sideband interface base IOCTL
*/
#define SB_BASE_IOCTL_NR 0xF9
/**
* DOC: SBRMI_IOCTL_MBOX_CMD
*
* @Parameters
*
* @struct apml_mbox_msg
* Pointer to the &struct apml_mbox_msg that will contain the protocol
* information
*
* @Description
* IOCTL command for APML messages using generic _IOWR
* The IOCTL provides userspace access to AMD sideband mailbox protocol
* - Mailbox message read/write(0x0~0xFF)
* - returning "-EFAULT" if none of the above
* "-EPROTOTYPE" error is returned to provide additional error details
*/
#define SBRMI_IOCTL_MBOX_CMD _IOWR(SB_BASE_IOCTL_NR, 0, struct apml_mbox_msg)
#endif /*_AMD_APML_H_*/
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