111 строки
2.8 KiB
C
111 строки
2.8 KiB
C
/* 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__ */
|