cpu/6502/net/ethernet.c

   1 /*
   2  * Copyright (c) 2007, Swedish Institute of Computer Science
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the Institute nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * This file is part of the Contiki operating system.
  30  *
  31  * Author: Oliver Schmidt <ol.sc@web.de>
  32  *
  33  * @(#)$Id: ethernet.c,v 1.6 2007/12/23 15:37:28 oliverschmidt Exp $
  34  */
  35
  36 #include <modload.h>
  37
  38 #include "contiki-net.h"
  39 #include "cfs/cfs.h"
  40 #include "sys/log.h"
  41 #include "lib/error.h"
  42 #include "net/ethernet-drv.h"
  43
  44 #include "net/ethernet.h"
  45
  46 struct {
  47   char                signature[4];
  48   struct uip_eth_addr ethernet_address;
  49   u8_t                *buffer;
  50   u16_t               buffer_size;
  51   void __fastcall__   (* init)(u16_t reg);
  52   u16_t               (* poll)(void);
  53   void __fastcall__   (* send)(u16_t len);
  54   void                (* exit)(void);
  55 } *module;
  56
  57 /*---------------------------------------------------------------------------*/
  58 void CC_FASTCALL
  59 ethernet_init(struct ethernet_config *config)
  60 {
  61   static const char signature[4] = {0x65, 0x74, 0x68, 0x01};
  62   struct mod_ctrl module_control = {cfs_read};
  63   u8_t byte;
  64
  65   module_control.callerdata = cfs_open(config->name, CFS_READ);
  66   if(module_control.callerdata < 0) {
  67     log_message(config->name, ": File not found");
  68     error_exit();
  69   }
  70
  71   byte = mod_load(&module_control);
  72   if(byte != MLOAD_OK) {
  73     log_message(config->name, byte == MLOAD_ERR_MEM? ": Out of memory":
  74                                                      ": No module");
  75     error_exit();
  76   }
  77
  78   cfs_close(module_control.callerdata);
  79   module = module_control.module;
  80
  81   for(byte = 0; byte < 4; ++byte) {
  82     if(module->signature[byte] != signature[byte]) {
  83       log_message(config->name, ": No ETH driver");
  84       error_exit();
  85     }
  86   }
  87
  88   module->buffer = uip_buf;
  89   module->buffer_size = UIP_BUFSIZE;
  90   module->init(config->addr);
  91
  92   uip_setethaddr(module->ethernet_address);
  93 }
  94 /*---------------------------------------------------------------------------*/
  95 u16_t
  96 ethernet_poll(void)
  97 {
  98   return module->poll();
  99 }
 100 /*---------------------------------------------------------------------------*/
 101 void
 102 ethernet_send(void)
 103 {
 104   module->send(uip_len);
 105 }
 106 /*---------------------------------------------------------------------------*/
 107 void
 108 ethernet_exit(void)
 109 {
 110   module->exit();
 111
 112   mod_free(module);
 113 }
 114 /*---------------------------------------------------------------------------*/