LXR linux/drivers/misc/ibmasm/i2o.h

   1/*
   2 * IBM ASM Service Processor Device Driver
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17 *
  18 * Copyright (C) IBM Corporation, 2004
  19 *
  20 * Author: Max Asböck <amax@us.ibm.com>
  21 *
  22 */
  23
  24#pragma pack(1)
  25struct i2o_header {
  26        u8      version;
  27        u8      message_flags;
  28        u16     message_size;
  29        u8      target;
  30        u8      initiator_and_target;
  31        u8      initiator;
  32        u8      function;
  33        u32     initiator_context;
  34};
  35#pragma pack()
  36
  37#define I2O_HEADER_TEMPLATE \
  38      { .version              = 0x01, \
  39        .message_flags        = 0x00, \
  40        .function             = 0xFF, \
  41        .initiator            = 0x00, \
  42        .initiator_and_target = 0x40, \
  43        .target               = 0x00, \
  44        .initiator_context    = 0x0 }
  45
  46#define I2O_MESSAGE_SIZE        0x1000
  47#define I2O_COMMAND_SIZE        (I2O_MESSAGE_SIZE - sizeof(struct i2o_header))
  48
  49#pragma pack(1)
  50struct i2o_message {
  51        struct i2o_header       header;
  52        void                    *data;
  53};
  54#pragma pack()
  55
  56static inline unsigned short outgoing_message_size(unsigned int data_size)
  57{
  58        unsigned int size;
  59        unsigned short i2o_size;
  60
  61        if (data_size > I2O_COMMAND_SIZE)
  62                data_size = I2O_COMMAND_SIZE;
  63
  64        size = sizeof(struct i2o_header) + data_size;
  65
  66        i2o_size = size / sizeof(u32);
  67
  68        if (size % sizeof(u32))
  69               i2o_size++;
  70
  71        return i2o_size;
  72}
  73
  74static inline u32 incoming_data_size(struct i2o_message *i2o_message)
  75{
  76        return (sizeof(u32) * i2o_message->header.message_size);
  77}
  78