drivers/char/rio/pkt.h

   1 /****************************************************************************
   2  *******                                                              *******
   3  *******            P A C K E T   H E A D E R   F I L E
   4  *******                                                              *******
   5  ****************************************************************************
   6
   7  Author  : Ian Nandhra / Jeremy Rolls
   8  Date    :
   9
  10  *
  11  *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
  12  *
  13  *      This program is free software; you can redistribute it and/or modify
  14  *      it under the terms of the GNU General Public License as published by
  15  *      the Free Software Foundation; either version 2 of the License, or
  16  *      (at your option) any later version.
  17  *
  18  *      This program is distributed in the hope that it will be useful,
  19  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *      GNU General Public License for more details.
  22  *
  23  *      You should have received a copy of the GNU General Public License
  24  *      along with this program; if not, write to the Free Software
  25  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26
  27  Version : 0.01
  28
  29
  30                             Mods
  31  ----------------------------------------------------------------------------
  32   Date     By                Description
  33  ----------------------------------------------------------------------------
  34
  35  ***************************************************************************/
  36
  37 #ifndef _pkt_h
  38 #define _pkt_h 1
  39
  40 #define PKT_CMD_BIT     ((ushort) 0x080)
  41 #define PKT_CMD_DATA    ((ushort) 0x080)
  42
  43 #define PKT_ACK         ((ushort) 0x040)
  44
  45 #define PKT_TGL         ((ushort) 0x020)
  46
  47 #define PKT_LEN_MASK    ((ushort) 0x07f)
  48
  49 #define DATA_WNDW       ((ushort) 0x10)
  50 #define PKT_TTL_MASK    ((ushort) 0x0f)
  51
  52 #define PKT_MAX_DATA_LEN   72
  53
  54 #define PKT_LENGTH         sizeof(struct PKT)
  55 #define SYNC_PKT_LENGTH    (PKT_LENGTH + 4)
  56
  57 #define CONTROL_PKT_LEN_MASK PKT_LEN_MASK
  58 #define CONTROL_PKT_CMD_BIT  PKT_CMD_BIT
  59 #define CONTROL_PKT_ACK (PKT_ACK << 8)
  60 #define CONTROL_PKT_TGL (PKT_TGL << 8)
  61 #define CONTROL_PKT_TTL_MASK (PKT_TTL_MASK << 8)
  62 #define CONTROL_DATA_WNDW  (DATA_WNDW << 8)
  63
  64 struct PKT {
  65         u8 dest_unit;           /* Destination Unit Id */
  66         u8 dest_port;           /* Destination POrt */
  67         u8 src_unit;            /* Source Unit Id */
  68         u8 src_port;            /* Source POrt */
  69         u8 len;
  70         u8 control;
  71         u8 data[PKT_MAX_DATA_LEN];
  72         /* Actual data :-) */
  73         u16 csum;               /* C-SUM */
  74 };
  75 #endif
  76
  77 /*********** end of file ***********/