/*
 * Copyright (C) 2016 Freescale Semiconductor, Inc.
 * Copyright 2017 NXP
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/*!
 * Header file for the RPC implementation.
 */

#ifndef _SC_RPC_H
#define _SC_RPC_H

/* Includes */

#include <sci/types.h>
#include <sci/ipc.h>

/* Defines */

#define SC_RPC_VERSION          1

#define SC_RPC_MAX_MSG          8

#define RPC_VER(MSG)            ((MSG)->version)
#define RPC_SIZE(MSG)           ((MSG)->size)
#define RPC_SVC(MSG)            ((MSG)->svc)
#define RPC_FUNC(MSG)           ((MSG)->func)
#define RPC_R8(MSG)             ((MSG)->func)
#define RPC_I32(MSG, IDX)       ((MSG)->DATA.i32[IDX / 4])
#define RPC_I16(MSG, IDX)       ((MSG)->DATA.i16[IDX / 2])
#define RPC_I8(MSG, IDX)        ((MSG)->DATA.i8[IDX])
#define RPC_U32(MSG, IDX)       ((MSG)->DATA.u32[IDX / 4])
#define RPC_U16(MSG, IDX)       ((MSG)->DATA.u16[IDX / 2])
#define RPC_U8(MSG, IDX)        ((MSG)->DATA.u8[IDX])

/* Types */

typedef enum sc_rpc_svc_e
{
    SC_RPC_SVC_UNKNOWN          = 0,
    SC_RPC_SVC_RETURN           = 1,
    SC_RPC_SVC_PM               = 2,
    SC_RPC_SVC_RM               = 3,
    SC_RPC_SVC_TIMER            = 5,
    SC_RPC_SVC_PAD              = 6,
    SC_RPC_SVC_MISC             = 7,
    SC_RPC_SVC_IRQ              = 8,
    SC_RPC_SVC_ABORT            = 9
} sc_rpc_svc_t;

typedef struct sc_rpc_msg_s
{
    uint8_t version;
    uint8_t size;
    uint8_t svc;
    uint8_t func;
    union
    {
        int32_t i32[(SC_RPC_MAX_MSG - 1)];
        int16_t i16[(SC_RPC_MAX_MSG - 1) * 2];
        int8_t i8[(SC_RPC_MAX_MSG - 1) * 4];
        uint32_t u32[(SC_RPC_MAX_MSG - 1)];
        uint16_t u16[(SC_RPC_MAX_MSG - 1) * 2];
        uint8_t u8[(SC_RPC_MAX_MSG - 1) * 4];
    } DATA;
} sc_rpc_msg_t;

typedef enum sc_rpc_async_state_e
{
    SC_RPC_ASYNC_STATE_RD_START     = 0,
    SC_RPC_ASYNC_STATE_RD_ACTIVE    = 1,
    SC_RPC_ASYNC_STATE_RD_DONE      = 2,
    SC_RPC_ASYNC_STATE_WR_START     = 3,
    SC_RPC_ASYNC_STATE_WR_ACTIVE    = 4,
    SC_RPC_ASYNC_STATE_WR_DONE      = 5,
} sc_rpc_async_state_t;

typedef struct sc_rpc_async_msg_s
{
    sc_rpc_async_state_t state;
    uint8_t wordIdx;
    sc_rpc_msg_t msg;
    uint32_t timeStamp;
} sc_rpc_async_msg_t;

/* Functions */

/*!
 * This is an internal function to send an RPC message over an IPC
 * channel. It is called by client-side SCFW API function shims.
 *
 * @param[in]     ipc         IPC handle
 * @param[in,out] msg         handle to a message
 * @param[in]     no_resp     response flag
 *
 * If \a no_resp is false then this function waits for a response
 * and returns the result in \a msg.
 */
void sc_call_rpc(sc_ipc_t ipc, sc_rpc_msg_t *msg, bool no_resp);

/*!
 * This is an internal function to dispath an RPC call that has
 * arrived via IPC over an MU. It is called by server-side SCFW.
 *
 * @param[in]     mu          MU message arrived on
 * @param[in,out] msg         handle to a message
 *
 * The function result is returned in \a msg.
 */
void sc_rpc_dispatch(sc_rsrc_t mu, sc_rpc_msg_t *msg);

/*!
 * This function translates an RPC message and forwards on to the
 * normal RPC API.  It is used only by hypervisors.
 *
 * @param[in]     ipc         IPC handle
 * @param[in,out] msg         handle to a message
 *
 * This function decodes a message, calls macros to translate the
 * resources, pads, addresses, partitions, memory regions, etc. and
 * then forwards on to the hypervisors SCFW API.Return results are
 * translated back abd placed back into the message to be returned
 * to the original API.
 */
void sc_rpc_xlate(sc_ipc_t ipc, sc_rpc_msg_t *msg);

#endif /* _SC_RPC_H */