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)
  25 struct 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)
  50 struct i2o_message {
  51         struct i2o_header       header;
  52         void                    *data;
  53 };
  54 #pragma pack()
  55
  56 static 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
  74 static inline u32 incoming_data_size(struct i2o_message *i2o_message)
  75 {
  76         return (sizeof(u32) * i2o_message->header.message_size);
  77 }