Mercurial > flash_v2

annotate packages/io/eth/current/src/stand_alone/eth_drv.c @ 126:518f42066aba ecos-sw-2000-09-19

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Merge from eCos master repository on 2000-09-19-06:25:26-BST
author jlarmour
date Tue, 19 Sep 2000 05:53:51 +0000
parents 6bd9d475ed4b
children 6b5f480c6929
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1 //==========================================================================
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2 //
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3 // eth_drv.c
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4 //
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5 // Stand-alone hardware independent networking support for RedBoot
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <pkgconf/system.h>
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47 #include <pkgconf/io_eth_drivers.h>
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48
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49 #include <cyg/infra/cyg_type.h>
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50 #include <cyg/hal/hal_arch.h>
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51 #include <cyg/infra/diag.h>
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52 #include <cyg/hal/drv_api.h>
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53 #include <cyg/hal/hal_if.h>
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54 #include <eth_drv.h>
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55 #include <netdev.h>
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56
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57 // High-level ethernet driver
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58
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59 // Define this to allow packets seen by this layer to be passed on to
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60 // the previous logical layer, i.e. when stand-alone processing replaces
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61 // system [eCos] processing.
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62 //
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63 // CAUTION! Observations indicate that this cannot work. When TCP packets
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64 // destined for the stand-alone layer are passed up, the eCos stack treats
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65 // them as evil and sends "disconnect" responses.
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66 //
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67 #undef ETH_DRV_PASS_PACKETS
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68 #define ETH_DRV_PASS_PACKETS
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69
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70 // Interfaces exported to drivers
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71
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72 static void eth_drv_init(struct eth_drv_sc *sc, unsigned char *enaddr);
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73 static void eth_drv_recv(struct eth_drv_sc *sc, int total_len);
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74 static void eth_drv_tx_done(struct eth_drv_sc *sc, CYG_ADDRWORD key, int status);
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75
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76 struct eth_drv_funs eth_drv_funs = {eth_drv_init, eth_drv_recv, eth_drv_tx_done};
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77
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78 int net_debug; // FIXME
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79
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80 unsigned char __local_enet_addr[ETHER_ADDR_LEN+2];
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81 struct eth_drv_sc *__local_enet_sc;
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82
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83 #ifdef ETH_DRV_PASS_PACKETS
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84 //
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85 // Horrible hack: In order to allow the stand-alone networking code to work
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86 // alongside eCos (or any other stack), separate IP addresses must be used.
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87 // When a packet arrives at the interface, we check to see which IP address
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88 // it corresponds to and only pass it "up" if it's not for the stand-alone
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89 // layer.
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90 //
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91 // tres degolas :-(
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92 //
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93 extern char __local_ip_addr[4];
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94 #endif
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95
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96 //
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97 // Buffer 'get' support. The problem is that this function only gets
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98 // called when some data is required, but packets may arrive on the device
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99 // at any time. More particularly, on some devices when data arrive, all
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100 // of that data needs to be consumed immediately or be lost. This process
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101 // is driven by interrupts, which in the stand-along case are simulated by
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102 // calling the "poll" interface.
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103 //
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104 // Thus there will be a pool of buffers, some free and some full, to try
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105 // and manage this.
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106 //
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107
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108 #define MAX_ETH_MSG 1540
119
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109 #define NUM_ETH_MSG CYGNUM_IO_ETH_DRIVERS_NUM_PKT
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110
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111 struct eth_msg {
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112 struct eth_msg *next, *prev;
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113 int len; // Actual number of bytes in message
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114 unsigned char data[MAX_ETH_MSG];
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115 };
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116
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117 struct eth_msg_hdr {
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118 struct eth_msg *first, *last;
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119 };
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120
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121 static struct eth_msg_hdr eth_msg_free, eth_msg_full;
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122 static struct eth_msg eth_msgs[NUM_ETH_MSG];
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123
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124 // Prototypes for functions used in this module
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125 static void eth_drv_start(struct eth_drv_sc *sc);
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126
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127 extern int start_console(void);
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128 extern void end_console(int);
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129 extern void printf(char *fmt, ...);
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130 extern void dump_buf(CYG_ADDRWORD, int);
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131
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132 // Simple queue management functions
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133
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134 static void
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135 eth_drv_msg_put(struct eth_msg_hdr *hdr, struct eth_msg *msg)
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136 {
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137 if (hdr->first != (struct eth_msg *)hdr) {
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138 // Something already in queue
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139 hdr->last->next = msg;
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140 msg->prev = hdr->last;
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141 msg->next = (struct eth_msg *)hdr;
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142 hdr->last = msg;
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143 } else {
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144 hdr->first = hdr->last = msg;
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145 msg->next = msg->prev = (struct eth_msg *)hdr;
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146 }
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147 }
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148
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149 static struct eth_msg *
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150 eth_drv_msg_get(struct eth_msg_hdr *hdr)
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151 {
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152 struct eth_msg *msg;
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153 if (hdr->first != (struct eth_msg *)hdr) {
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154 msg = hdr->first;
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155 hdr->first = msg->next;
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156 msg->next->prev = (struct eth_msg *)hdr;
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157 } else {
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158 msg = (struct eth_msg *)NULL;
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159 }
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160 return msg;
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161 }
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162
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163 void
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164 eth_drv_buffers_init(void)
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165 {
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166 int i;
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167 struct eth_msg *msg = eth_msgs;
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168
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169 eth_msg_full.first = eth_msg_full.last = (struct eth_msg *)&eth_msg_full;
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170 eth_msg_free.first = eth_msg_free.last = (struct eth_msg *)&eth_msg_free;
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171 for (i = 0; i < NUM_ETH_MSG; i++, msg++) {
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172 eth_drv_msg_put(&eth_msg_free, msg);
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173 }
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174 }
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175
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176 //
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177 // This function is called during system initialization to register a
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178 // network interface with the system.
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179 //
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180 static void
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181 eth_drv_init(struct eth_drv_sc *sc, unsigned char *enaddr)
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182 {
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183 // Set up hardware address
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184 memcpy(&sc->sc_arpcom.esa, enaddr, ETHER_ADDR_LEN);
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185 memcpy(__local_enet_addr, enaddr, ETHER_ADDR_LEN);
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186 __local_enet_sc = sc;
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187 eth_drv_start(sc);
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188 }
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189
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190 #if 0 // Not currently used. Left in case it's needed in the future
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191 //
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192 // This [internal] function will be called to stop activity on an interface.
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193 //
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194 static void
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195 eth_drv_stop(struct eth_drv_sc *sc)
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196 {
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197 (sc->funs->stop)(sc);
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198 }
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199 #endif
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200
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201 //
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202 // This [internal] function will be called to start activity on an interface.
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203 //
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204 static void
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205 eth_drv_start(struct eth_drv_sc *sc)
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206 {
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207 // Perform any hardware initialization
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208 (sc->funs->start)(sc, (unsigned char *)&sc->sc_arpcom.esa, 0);
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209 }
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210
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211 //
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212 // Send a packet of data to the hardware
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213 //
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214 static int packet_sent;
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215
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216 void
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217 eth_drv_write(char *eth_hdr, char *buf, int len)
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218 {
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219 struct eth_drv_sg sg_list[MAX_ETH_DRV_SG];
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220 struct eth_drv_sc *sc = __local_enet_sc;
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221 int sg_len = 2;
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222 void *dbg = CYGACC_CALL_IF_DBG_DATA();
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223 int old_state;
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224 int wait_time = 5; // Timeout before giving up
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225
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226 if (dbg) {
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227 sc = (struct eth_drv_sc *)dbg; // Use control from installed driver
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228 sc->funs->eth_drv_old = sc->funs->eth_drv;
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229 sc->funs->eth_drv = &eth_drv_funs; // Substitute stand-alone driver
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230 old_state = sc->state;
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231 if (!old_state & ETH_DRV_STATE_ACTIVE) {
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232 // This interface not fully initialized, do it now
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233 (sc->funs->start)(sc, (unsigned char *)&__local_enet_addr, 0);
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234 sc->state |= ETH_DRV_STATE_ACTIVE;
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235 }
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236 }
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237
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238 while (!(sc->funs->can_send)(sc)) {
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239 // Give driver a chance to service hardware
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240 (sc->funs->poll)(sc);
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241 CYGACC_CALL_IF_DELAY_US(2*100000);
126
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242 if (--wait_time <= 0)
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243 goto reset_and_out; // Give up on sending packet
115
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244 }
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245
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246 sg_list[0].buf = (CYG_ADDRESS)eth_hdr;
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247 sg_list[0].len = 14; // FIXME
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248 sg_list[1].buf = (CYG_ADDRESS)buf;
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249 sg_list[1].len = len;
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250 packet_sent = 0;
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251 (sc->funs->send)(sc, sg_list, sg_len, len+14, (CYG_ADDRWORD)&packet_sent);
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252 if (net_debug) {
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253 int old_console;
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254 old_console = start_console();
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255 printf("Ethernet send:\n");
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256 dump_buf((CYG_ADDRWORD)eth_hdr, 14);
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257 dump_buf((CYG_ADDRWORD)buf, len);
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258 end_console(old_console);
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259 }
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260
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261 while (!packet_sent) {
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262 (sc->funs->poll)(sc);
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263 }
126
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264 reset_and_out:
115
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265 if (dbg) {
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266 // if (!old_state & ETH_DRV_STATE_ACTIVE) {
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267 // // This interface was not fully initialized, shut it back down
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268 // (sc->funs->stop)(sc);
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269 // }
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270 sc->funs->eth_drv = sc->funs->eth_drv_old;
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271 sc->funs->eth_drv_old = (struct eth_drv_funs *)0;
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272 }
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273 }
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274
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275 //
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276 // This function is called from the hardware driver when an output operation
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277 // has completed - i.e. the packet has been sent.
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278 //
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279 static void
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280 eth_drv_tx_done(struct eth_drv_sc *sc, CYG_ADDRWORD key, int status)
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281 {
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282 if ((int *)key == &packet_sent) {
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283 *(int *)key = 1;
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284 } else {
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285 // It's possible that this acknowledgement is for a different
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286 // [logical] driver. Try and pass it on.
119
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287 #ifdef CYGSEM_IO_ETH_DRIVERS_DEBUG
115
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288 int old_console;
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289 old_console = start_console();
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290 printf("tx_done for other key: %x\n", key);
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291 end_console(old_console);
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292 #endif
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293 (sc->funs->eth_drv_old->tx_done)(sc, key, status);
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294 }
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295 }
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296
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297 //
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298 // Receive one packet of data from the hardware, if available
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299 //
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300 int
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301 eth_drv_read(char *eth_hdr, char *buf, int len)
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302 {
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303 struct eth_drv_sc *sc = __local_enet_sc;
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304 struct eth_msg *msg;
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305 int res;
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306 void *dbg = CYGACC_CALL_IF_DBG_DATA();
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307 int old_state;
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308
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309 if (dbg) {
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310 sc = (struct eth_drv_sc *)dbg; // Use control from installed driver
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311 sc->funs->eth_drv_old = sc->funs->eth_drv;
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312 sc->funs->eth_drv = &eth_drv_funs; // Substitute stand-alone driver
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313 old_state = sc->state;
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314 if (!old_state & ETH_DRV_STATE_ACTIVE) {
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315 // This interface not fully initialized, do it now
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316 (sc->funs->start)(sc, (unsigned char *)&__local_enet_addr, 0);
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317 sc->state |= ETH_DRV_STATE_ACTIVE;
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318 }
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319 }
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320 (sc->funs->poll)(sc); // Give the driver a chance to fetch packets
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321 msg = eth_drv_msg_get(&eth_msg_full);
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322 if (msg) {
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323 memcpy(eth_hdr, msg->data, 14);
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324 memcpy(buf, &msg->data[14], msg->len-14);
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325 eth_drv_msg_put(&eth_msg_free, msg);
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326 res = msg->len;
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327 } else {
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328 res = 0; // No packets available
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329 }
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330
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331 if (dbg) {
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332 sc->funs->eth_drv = sc->funs->eth_drv_old;
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333 sc->funs->eth_drv_old = (struct eth_drv_funs *)0;
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334 // if (!old_state & ETH_DRV_STATE_ACTIVE) {
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335 // // This interface was not fully initialized, shut it back down
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336 // (sc->funs->stop)(sc);
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337 // }
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338 }
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339 return res;
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340 }
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341
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342 #ifdef ETH_DRV_PASS_PACKETS
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343 //
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344 // This function is called to copy a message up to the next level.
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345 // It is only used when this driver has usurped the processing of
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346 // network functions.
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347 //
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348 static unsigned char *eth_drv_copy_recv_buf;
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349 static void
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350 eth_drv_copy_recv(struct eth_drv_sc *sc,
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351 struct eth_drv_sg *sg_list,
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352 int sg_len)
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353 {
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354 int i;
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355
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356 for (i = 0; i < sg_len; i++) {
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357 memcpy((unsigned char *)sg_list[i].buf,
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358 eth_drv_copy_recv_buf, sg_list[i].len);
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359 eth_drv_copy_recv_buf += sg_list[i].len;
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360 }
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361 }
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362 #endif
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363
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364 //
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365 // This function is called from a hardware driver to indicate that an input
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366 // packet has arrived. The routine will set up appropriate network resources
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367 // to hold the data and call back into the driver to retrieve the data.
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368 //
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369 static void
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370 eth_drv_recv(struct eth_drv_sc *sc, int total_len)
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371 {
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372 struct eth_drv_sg sg_list[MAX_ETH_DRV_SG];
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373 int sg_len = 0;
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374 struct eth_msg *msg;
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375 unsigned char *buf;
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376
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377 msg = eth_drv_msg_get(&eth_msg_free);
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378 if (msg) {
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379 buf = msg->data;
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380 } else {
119
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381 #ifdef CYGSEM_IO_ETH_DRIVERS_WARN
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382 int old_console;
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383 old_console = start_console();
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384 printf("%s: packet of %d bytes dropped\n", __FUNCTION__, total_len);
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385 end_console(old_console);
119
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386 #endif
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387 buf = (char *)0; // Drivers know this means "the bit bucket"
115
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388 }
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389 sg_list[0].buf = (CYG_ADDRESS)buf;
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390 sg_list[0].len = total_len;
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391 sg_len = 1;
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392
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393 (sc->funs->recv)(sc, sg_list, sg_len);
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394 if (net_debug) {
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395 int old_console;
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396 old_console = start_console();
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397 printf("Ethernet recv:\n");
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398 dump_buf((CYG_ADDRWORD)buf, 14);
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399 dump_buf((CYG_ADDRWORD)buf+14, total_len-14);
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400 end_console(old_console);
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401 }
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402 #ifdef ETH_DRV_PASS_PACKETS
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403 if (sc->funs->eth_drv_old != (struct eth_drv_funs *)0) {
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404 void (*hold_recv)(struct eth_drv_sc *sc,
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405 struct eth_drv_sg *sg_list,
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406 int sg_len);
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407 // See if this packet was for us. If not, pass it upwards
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408 // This is a major layering violation!!
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409 if (memcmp(&__local_ip_addr, &buf[14+16], 4)) {
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410 hold_recv = sc->funs->recv;
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411 sc->funs->recv = eth_drv_copy_recv;
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412 eth_drv_copy_recv_buf = buf;
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413 // This calls into the 'other' driver, giving it a chance to
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414 // do something with this data (since it wasn't for us)
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415 (sc->funs->eth_drv_old->recv)(sc, total_len);
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416 sc->funs->recv = hold_recv;
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417 }
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418 }
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419 #endif
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420 if (msg) {
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421 msg->len = total_len;
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422 eth_drv_msg_put(&eth_msg_full, msg);
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423 #ifdef CYGSEM_IO_ETH_DRIVERS_WARN
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424 } else {
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425 dump_buf(sg_list[0].buf, sg_list[0].len);
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426 #endif
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427 }
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428 }
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429
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430 //
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431 // Determine the interrupt vector used by an interface
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432 //
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433 int
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434 eth_drv_int_vector(void)
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435 {
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436 struct eth_drv_sc *sc = __local_enet_sc;
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437 return sc->funs->int_vector(sc);
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438 }
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439
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440
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441 void eth_drv_dsr(cyg_vector_t vector,
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442 cyg_ucount32 count,
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443 cyg_addrword_t data)
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444 {
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445 printf( "eth_drv_dsr should not be called: vector %d, data %x\n",
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446 vector, data );
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447 }
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448
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449
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450 // EOF src/stand_alone/eth_drv.c