LXR linux/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
  64struct 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 ***********/
  78