drivers/isdn/hardware/eicon/istream.c

   1
   2 /*
   3  *
   4   Copyright (c) Eicon Networks, 2002.
   5  *
   6   This source file is supplied for the use with
   7   Eicon Networks range of DIVA Server Adapters.
   8  *
   9   Eicon File Revision :    2.1
  10  *
  11   This program is free software; you can redistribute it and/or modify
  12   it under the terms of the GNU General Public License as published by
  13   the Free Software Foundation; either version 2, or (at your option)
  14   any later version.
  15  *
  16   This program is distributed in the hope that it will be useful,
  17   but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY
  18   implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  19   See the GNU General Public License for more details.
  20  *
  21   You should have received a copy of the GNU General Public License
  22   along with this program; if not, write to the Free Software
  23   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  */
  26 #include "platform.h"
  27 #if defined(DIVA_ISTREAM) /* { */
  28 #include "pc.h"
  29 #include "pr_pc.h"
  30 #include "di_defs.h"
  31 #include "divasync.h"
  32 #include "di.h"
  33 #if !defined USE_EXTENDED_DEBUGS
  34   #include "dimaint.h"
  35 #else
  36   #define dprintf
  37 #endif
  38 #include "dfifo.h"
  39 int diva_istream_write (void* context,
  40              int   Id,
  41               void* data,
  42              int length,
  43              int final,
  44             byte usr1,
  45             byte usr2);
  46 int diva_istream_read (void* context,
  47             int Id,
  48             void* data,
  49             int max_length,
  50             int* final,
  51             byte* usr1,
  52             byte* usr2);
  53 /* -------------------------------------------------------------------
  54   Does provide iStream interface to the client
  55    ------------------------------------------------------------------- */
  56 void diva_xdi_provide_istream_info (ADAPTER* a,
  57                   diva_xdi_stream_interface_t* pi) {
  58   pi->provided_service = 0;
  59 }
  60 /* ------------------------------------------------------------------
  61   Does write the data from caller's buffer to the card's
  62   stream interface.
  63   If synchronous service was requested, then function
  64   does return amount of data written to stream.
  65   'final' does indicate that pice of data to be written is
  66   final part of frame (necessary only by structured datatransfer)
  67   return  0 if zero lengh packet was written
  68   return -1 if stream is full
  69   ------------------------------------------------------------------ */
  70 int diva_istream_write (void* context,
  71                 int   Id,
  72                   void* data,
  73                  int length,
  74                  int final,
  75                 byte usr1,
  76                 byte usr2) {
  77  ADAPTER* a = (ADAPTER*)context;
  78  int written = 0, to_write = -1;
  79  char tmp[4];
  80  byte* data_ptr = (byte*)data;
  81  for (;;) {
  82   a->ram_in_dw (a,
  83 #ifdef PLATFORM_GT_32BIT
  84          ULongToPtr(a->tx_stream[Id] + a->tx_pos[Id]),
  85 #else
  86          (void*)(a->tx_stream[Id] + a->tx_pos[Id]),
  87 #endif
  88                   (dword*)&tmp[0],
  89          1);
  90   if (tmp[0] & DIVA_DFIFO_READY) { /* No free blocks more */
  91    if (to_write < 0)
  92     return (-1); /* was not able to write       */
  93    break;     /* only part of message was written */
  94   }
  95   to_write = min(length, DIVA_DFIFO_DATA_SZ);
  96   if (to_write) {
  97    a->ram_out_buffer (a,
  98 #ifdef PLATFORM_GT_32BIT
  99             ULongToPtr(a->tx_stream[Id] + a->tx_pos[Id]+4),
 100 #else
 101               (void*)(a->tx_stream[Id] + a->tx_pos[Id] + 4),
 102 #endif
 103                          data_ptr,
 104              (word)to_write);
 105    length  -= to_write;
 106    written  += to_write;
 107    data_ptr += to_write;
 108   }
 109   tmp[1] = (char)to_write;
 110   tmp[0] = (tmp[0] & DIVA_DFIFO_WRAP) |
 111        DIVA_DFIFO_READY |
 112        ((!length && final) ? DIVA_DFIFO_LAST : 0);
 113   if (tmp[0] & DIVA_DFIFO_LAST) {
 114    tmp[2] = usr1;
 115    tmp[3] = usr2;
 116   }
 117     a->ram_out_dw (a,
 118 #ifdef PLATFORM_GT_32BIT
 119          ULongToPtr(a->tx_stream[Id] + a->tx_pos[Id]),
 120 #else
 121            (void*)(a->tx_stream[Id] + a->tx_pos[Id]),
 122 #endif
 123                    (dword*)&tmp[0],
 124           1);
 125   if (tmp[0] & DIVA_DFIFO_WRAP) {
 126    a->tx_pos[Id]  = 0;
 127   } else {
 128    a->tx_pos[Id] += DIVA_DFIFO_STEP;
 129   }
 130   if (!length) {
 131    break;
 132   }
 133  }
 134  return (written);
 135 }
 136 /* -------------------------------------------------------------------
 137   In case of SYNCRONOUS service:
 138   Does write data from stream in caller's buffer.
 139   Does return amount of data written to buffer
 140   Final flag is set on return if last part of structured frame
 141   was received
 142   return 0  if zero packet was received
 143   return -1 if stream is empty
 144     return -2 if read buffer does not profide sufficient space
 145               to accommodate entire segment
 146   max_length should be at least 68 bytes
 147   ------------------------------------------------------------------- */
 148 int diva_istream_read (void* context,
 149                 int Id,
 150                 void* data,
 151                 int max_length,
 152                 int* final,
 153                byte* usr1,
 154                byte* usr2) {
 155  ADAPTER* a = (ADAPTER*)context;
 156  int read = 0, to_read = -1;
 157  char tmp[4];
 158  byte* data_ptr = (byte*)data;
 159  *final = 0;
 160  for (;;) {
 161   a->ram_in_dw (a,
 162 #ifdef PLATFORM_GT_32BIT
 163          ULongToPtr(a->rx_stream[Id] + a->rx_pos[Id]),
 164 #else
 165          (void*)(a->rx_stream[Id] + a->rx_pos[Id]),
 166 #endif
 167                   (dword*)&tmp[0],
 168          1);
 169   if (tmp[1] > max_length) {
 170    if (to_read < 0)
 171     return (-2); /* was not able to read */
 172    break;
 173     }
 174   if (!(tmp[0] & DIVA_DFIFO_READY)) {
 175    if (to_read < 0)
 176     return (-1); /* was not able to read */
 177    break;
 178   }
 179   to_read = min(max_length, (int)tmp[1]);
 180   if (to_read) {
 181    a->ram_in_buffer(a,
 182 #ifdef PLATFORM_GT_32BIT
 183            ULongToPtr(a->rx_stream[Id] + a->rx_pos[Id] + 4),
 184 #else
 185             (void*)(a->rx_stream[Id] + a->rx_pos[Id] + 4),
 186 #endif
 187                        data_ptr,
 188             (word)to_read);
 189    max_length -= to_read;
 190    read     += to_read;
 191    data_ptr  += to_read;
 192   }
 193   if (tmp[0] & DIVA_DFIFO_LAST) {
 194    *final = 1;
 195   }
 196   tmp[0] &= DIVA_DFIFO_WRAP;
 197     a->ram_out_dw(a,
 198 #ifdef PLATFORM_GT_32BIT
 199          ULongToPtr(a->rx_stream[Id] + a->rx_pos[Id]),
 200 #else
 201          (void*)(a->rx_stream[Id] + a->rx_pos[Id]),
 202 #endif
 203          (dword*)&tmp[0],
 204          1);
 205   if (tmp[0] & DIVA_DFIFO_WRAP) {
 206    a->rx_pos[Id]  = 0;
 207   } else {
 208    a->rx_pos[Id] += DIVA_DFIFO_STEP;
 209   }
 210   if (*final) {
 211    if (usr1)
 212     *usr1 = tmp[2];
 213    if (usr2)
 214     *usr2 = tmp[3];
 215    break;
 216   }
 217  }
 218  return (read);
 219 }
 220 /* ---------------------------------------------------------------------
 221   Does check if one of streams had caused interrupt and does
 222   wake up corresponding application
 223    --------------------------------------------------------------------- */
 224 void pr_stream (ADAPTER * a) {
 225 }
 226 #endif /* } */