drivers/misc/ibmasm/i2o.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * IBM ASM Service Processor Device Driver
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  *
   7  * Author: Max Asböck <amax@us.ibm.com>
   8  */
   9
  10 #pragma pack(1)
  11 struct i2o_header {
  12         u8      version;
  13         u8      message_flags;
  14         u16     message_size;
  15         u8      target;
  16         u8      initiator_and_target;
  17         u8      initiator;
  18         u8      function;
  19         u32     initiator_context;
  20 };
  21 #pragma pack()
  22
  23 #define I2O_HEADER_TEMPLATE \
  24       { .version              = 0x01, \
  25         .message_flags        = 0x00, \
  26         .function             = 0xFF, \
  27         .initiator            = 0x00, \
  28         .initiator_and_target = 0x40, \
  29         .target               = 0x00, \
  30         .initiator_context    = 0x0 }
  31
  32 #define I2O_MESSAGE_SIZE        0x1000
  33 #define I2O_COMMAND_SIZE        (I2O_MESSAGE_SIZE - sizeof(struct i2o_header))
  34
  35 #pragma pack(1)
  36 struct i2o_message {
  37         struct i2o_header       header;
  38         void                    *data;
  39 };
  40 #pragma pack()
  41
  42 static inline unsigned short outgoing_message_size(unsigned int data_size)
  43 {
  44         unsigned int size;
  45         unsigned short i2o_size;
  46
  47         if (data_size > I2O_COMMAND_SIZE)
  48                 data_size = I2O_COMMAND_SIZE;
  49
  50         size = sizeof(struct i2o_header) + data_size;
  51
  52         i2o_size = size / sizeof(u32);
  53
  54         if (size % sizeof(u32))
  55                i2o_size++;
  56
  57         return i2o_size;
  58 }
  59
  60 static inline u32 incoming_data_size(struct i2o_message *i2o_message)
  61 {
  62         return (sizeof(u32) * i2o_message->header.message_size);
  63 }