/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * IBM ASM Service Processor Device Driver
 *
 * Copyright (C) IBM Corporation, 2004
 *
 * Author: Max Asböck <amax@us.ibm.com>
 */

#pragma pack(1)
struct i2o_header {
        u8      version;
        u8      message_flags;
        u16     message_size;
        u8      target;
        u8      initiator_and_target;
        u8      initiator;
        u8      function;
        u32     initiator_context;
};
#pragma pack()

#define I2O_HEADER_TEMPLATE \
      { .version              = 0x01, \
        .message_flags        = 0x00, \
        .function             = 0xFF, \
        .initiator            = 0x00, \
        .initiator_and_target = 0x40, \
        .target               = 0x00, \
        .initiator_context    = 0x0 }

#define I2O_MESSAGE_SIZE        0x1000
#define I2O_COMMAND_SIZE        (I2O_MESSAGE_SIZE - sizeof(struct i2o_header))

#pragma pack(1)
struct i2o_message {
        struct i2o_header       header;
        void                    *data;
};
#pragma pack()

static inline unsigned short outgoing_message_size(unsigned int data_size)
{
        unsigned int size;
        unsigned short i2o_size;

        if (data_size > I2O_COMMAND_SIZE)
                data_size = I2O_COMMAND_SIZE;

        size = sizeof(struct i2o_header) + data_size;

        i2o_size = size / sizeof(u32);

        if (size % sizeof(u32))
               i2o_size++;

        return i2o_size;
}

static inline u32 incoming_data_size(struct i2o_message *i2o_message)
{
        return (sizeof(u32) * i2o_message->header.message_size);
}