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/*
* Texas Instruments K3 Secure Proxy Driver
* Based on Linux and U-Boot implementation
*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef SEC_PROXY_H
#define SEC_PROXY_H
#include <stdint.h>
/**
* enum k3_sec_proxy_chan_id - Secure Proxy thread IDs
*
* These the available IDs used in k3_sec_proxy_{send,recv}()
* There are two schemes we use:
* * if K3_SEC_PROXY_LITE = 1, we just have two threads to talk
* * if K3_SEC_PROXY_LITE = 0, we have the full fledged
* communication scheme available.
*/
enum k3_sec_proxy_chan_id {
#if !K3_SEC_PROXY_LITE
SP_NOTIFY = 0,
SP_RESPONSE,
SP_HIGH_PRIORITY,
SP_LOW_PRIORITY,
SP_NOTIFY_RESP,
#else
SP_RESPONSE = 8,
/*
* Note: TISCI documentation indicates "low priority", but in reality
* with a single thread, there is no low or high priority.. This usage
* is more appropriate for TF-A since we can reduce the churn as a
* result.
*/
SP_HIGH_PRIORITY,
#endif /* K3_SEC_PROXY_LITE */
};
/**
* struct k3_sec_proxy_msg - Secure proxy message structure
* @len: Length of data in the Buffer
* @buf: Buffer pointer
*
* This is the structure for data used in k3_sec_proxy_{send,recv}()
*/
struct k3_sec_proxy_msg {
size_t len;
uint8_t *buf;
};
/**
* k3_sec_proxy_send() - Send data over a Secure Proxy thread
* @id: Channel Identifier
* @msg: Pointer to k3_sec_proxy_msg
*
* Return: 0 if all goes well, else appropriate error message
*/
int k3_sec_proxy_clear_rx_thread(enum k3_sec_proxy_chan_id id);
/**
* k3_sec_proxy_send() - Send data over a Secure Proxy thread
* @id: Channel Identifier
* @msg: Pointer to k3_sec_proxy_msg
*
* Return: 0 if all goes well, else appropriate error message
*/
int k3_sec_proxy_send(enum k3_sec_proxy_chan_id id, const struct k3_sec_proxy_msg *msg);
/**
* k3_sec_proxy_recv() - Receive data from a Secure Proxy thread
* @id: Channel Identifier
* @msg: Pointer to k3_sec_proxy_msg
*
* Return: 0 if all goes well, else appropriate error message
*/
int k3_sec_proxy_recv(enum k3_sec_proxy_chan_id id, struct k3_sec_proxy_msg *msg);
#endif /* SEC_PROXY_H */
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