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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2023 SberDevices, Inc.
*
* Author: Alexey Romanov <avromanov@salutedevices.com>
*/
#ifndef __SM_UCLASS_H__
#define __SM_UCLASS_H__
#include <asm/types.h>
#include <asm/ptrace.h>
struct udevice;
/**
* struct sm_ops - The functions that a SM driver must implement.
*
* @sm_call: Request a secure monitor call with specified command.
*
* @sm_call_read: Request a secure monitor call and retrieve data
* from secure-monitor (depends on specified command).
*
* @sm_call_write: Request a secure monitor call and send data
* to secure-monitor (depends on specified command).
*
* The individual methods are described more fully below.
*/
struct sm_ops {
/**
* sm_call - generic SMC call to the secure-monitor
*
* @dev: Pointer to UCLASS_SM device
* @cmd_index: Index of the SMC function ID
* @smc_ret: Returned value from secure world
* @args: SMC arguments
*
* @return: 0 on success, a negative value on error
*/
int (*sm_call)(struct udevice *dev, u32 cmd, s32 *smc_ret,
struct pt_regs *args);
/**
* sm_call_write - send data to secure-monitor
*
* @dev: Pointer to UCLASS_SM device
* @buffer: Buffer containing data to send
* @size: Size of the buffer
* @cmd: Index of the SMC function ID
* @args: SMC arguments
*
* @return: size of sent data on success, a negative value on error
*/
int (*sm_call_write)(struct udevice *dev, void *buffer,
size_t size, u32 cmd, struct pt_regs *args);
/**
* sm_call_read - retrieve data from secure-monitor
*
* @dev: Pointer to UCLASS_SM device
* @buffer: Buffer to store the retrieved data
* @size: Size of the buffer
* @cmd: Index of the SMC function ID
* @args: SMC arguments
*
* @return: size of read data on success, a negative value on error
*/
int (*sm_call_read)(struct udevice *dev, void *buffer,
size_t size, u32 cmd, struct pt_regs *args);
};
#endif /* __SM_UCLASS_H__ */
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