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/* SPDX-License-Identifier: MIT */
/*
* Copyright 2019 Advanced Micro Devices, Inc.
*
* Author: Rijo Thomas <Rijo-john.Thomas@amd.com>
* Author: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
*
*/
/* This file describes the TEE communication interface between host and AMD
* Secure Processor
*/
#ifndef __TEE_DEV_H__
#define __TEE_DEV_H__
#include <linux/device.h>
#include <linux/mutex.h>
#define TEE_DEFAULT_TIMEOUT 10
#define MAX_BUFFER_SIZE 992
/**
* enum tee_ring_cmd_id - TEE interface commands for ring buffer configuration
* @TEE_RING_INIT_CMD: Initialize ring buffer
* @TEE_RING_DESTROY_CMD: Destroy ring buffer
* @TEE_RING_MAX_CMD: Maximum command id
*/
enum tee_ring_cmd_id {
TEE_RING_INIT_CMD = 0x00010000,
TEE_RING_DESTROY_CMD = 0x00020000,
TEE_RING_MAX_CMD = 0x000F0000,
};
/**
* struct tee_init_ring_cmd - Command to init TEE ring buffer
* @low_addr: bits [31:0] of the physical address of ring buffer
* @hi_addr: bits [63:32] of the physical address of ring buffer
* @size: size of ring buffer in bytes
*/
struct tee_init_ring_cmd {
u32 low_addr;
u32 hi_addr;
u32 size;
};
#define MAX_RING_BUFFER_ENTRIES 32
/**
* struct ring_buf_manager - Helper structure to manage ring buffer.
* @ring_start: starting address of ring buffer
* @ring_size: size of ring buffer in bytes
* @ring_pa: physical address of ring buffer
* @wptr: index to the last written entry in ring buffer
*/
struct ring_buf_manager {
struct mutex mutex; /* synchronizes access to ring buffer */
void *ring_start;
u32 ring_size;
phys_addr_t ring_pa;
u32 wptr;
};
struct psp_tee_device {
struct device *dev;
struct psp_device *psp;
void __iomem *io_regs;
struct tee_vdata *vdata;
struct ring_buf_manager rb_mgr;
};
/**
* enum tee_cmd_state - TEE command states for the ring buffer interface
* @TEE_CMD_STATE_INIT: initial state of command when sent from host
* @TEE_CMD_STATE_PROCESS: command being processed by TEE environment
* @TEE_CMD_STATE_COMPLETED: command processing completed
*/
enum tee_cmd_state {
TEE_CMD_STATE_INIT,
TEE_CMD_STATE_PROCESS,
TEE_CMD_STATE_COMPLETED,
};
/**
* struct tee_ring_cmd - Structure of the command buffer in TEE ring
* @cmd_id: refers to &enum tee_cmd_id. Command id for the ring buffer
* interface
* @cmd_state: refers to &enum tee_cmd_state
* @status: status of TEE command execution
* @res0: reserved region
* @pdata: private data (currently unused)
* @res1: reserved region
* @buf: TEE command specific buffer
*/
struct tee_ring_cmd {
u32 cmd_id;
u32 cmd_state;
u32 status;
u32 res0[1];
u64 pdata;
u32 res1[2];
u8 buf[MAX_BUFFER_SIZE];
/* Total size: 1024 bytes */
} __packed;
int tee_dev_init(struct psp_device *psp);
void tee_dev_destroy(struct psp_device *psp);
#endif /* __TEE_DEV_H__ */
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