1 | /* |
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2 | * RTEMS driver for M68360 SCC1 Ethernet |
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3 | * |
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4 | * W. Eric Norum |
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5 | * Saskatchewan Accelerator Laboratory |
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6 | * University of Saskatchewan |
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7 | * Saskatoon, Saskatchewan, CANADA |
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8 | * eric@skatter.usask.ca |
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9 | * |
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10 | * $Id$ |
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11 | */ |
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12 | #include <bsp.h> |
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13 | #include <m68360.h> |
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14 | #include <stdio.h> |
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15 | #include <rtems/error.h> |
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16 | #include <rtems/rtems_bsdnet.h> |
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17 | |
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18 | #include <sys/param.h> |
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19 | #include <sys/mbuf.h> |
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20 | #include <sys/socket.h> |
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21 | #include <sys/sockio.h> |
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22 | |
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23 | #include <net/if.h> |
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24 | |
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25 | #include <netinet/in.h> |
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26 | #include <netinet/if_ether.h> |
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27 | |
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28 | /* |
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29 | * Number of SCCs supported by this driver |
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30 | */ |
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31 | #define NSCCDRIVER 1 |
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32 | |
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33 | /* |
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34 | * Default number of buffer descriptors set aside for this driver. |
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35 | * The number of transmit buffer descriptors has to be quite large |
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36 | * since a single frame often uses four or more buffer descriptors. |
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37 | */ |
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38 | #define RX_BUF_COUNT 15 |
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39 | #define TX_BUF_COUNT 4 |
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40 | #define TX_BD_PER_BUF 4 |
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41 | |
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42 | /* |
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43 | * RTEMS event used by interrupt handler to signal driver tasks. |
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44 | * This must not be any of the events used by the network task synchronization. |
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45 | */ |
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46 | #define INTERRUPT_EVENT RTEMS_EVENT_1 |
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47 | |
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48 | /* |
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49 | * RTEMS event used to start transmit daemon. |
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50 | * This must not be the same as INTERRUPT_EVENT. |
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51 | */ |
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52 | #define START_TRANSMIT_EVENT RTEMS_EVENT_2 |
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53 | |
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54 | /* |
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55 | * Receive buffer size -- Allow for a full ethernet packet including CRC |
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56 | */ |
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57 | #define RBUF_SIZE 1520 |
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58 | |
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59 | #if (MCLBYTES < RBUF_SIZE) |
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60 | # error "Driver must have MCLBYTES > RBUF_SIZE" |
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61 | #endif |
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62 | |
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63 | /* |
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64 | * Per-device data |
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65 | */ |
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66 | struct scc_softc { |
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67 | struct arpcom arpcom; |
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68 | struct mbuf **rxMbuf; |
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69 | struct mbuf **txMbuf; |
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70 | int acceptBroadcast; |
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71 | int rxBdCount; |
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72 | int txBdCount; |
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73 | int txBdHead; |
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74 | int txBdTail; |
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75 | int txBdActiveCount; |
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76 | m360BufferDescriptor_t *rxBdBase; |
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77 | m360BufferDescriptor_t *txBdBase; |
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78 | rtems_id rxDaemonTid; |
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79 | rtems_id txDaemonTid; |
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80 | |
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81 | /* |
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82 | * Statistics |
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83 | */ |
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84 | unsigned long rxInterrupts; |
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85 | unsigned long rxNotFirst; |
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86 | unsigned long rxNotLast; |
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87 | unsigned long rxGiant; |
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88 | unsigned long rxNonOctet; |
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89 | unsigned long rxRunt; |
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90 | unsigned long rxBadCRC; |
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91 | unsigned long rxOverrun; |
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92 | unsigned long rxCollision; |
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93 | |
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94 | unsigned long txInterrupts; |
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95 | unsigned long txDeferred; |
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96 | unsigned long txHeartbeat; |
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97 | unsigned long txLateCollision; |
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98 | unsigned long txRetryLimit; |
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99 | unsigned long txUnderrun; |
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100 | unsigned long txLostCarrier; |
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101 | unsigned long txRawWait; |
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102 | unsigned long txCoalesced; |
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103 | unsigned long txCoalesceFailed; |
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104 | unsigned long txRetry; |
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105 | }; |
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106 | static struct scc_softc scc_softc[NSCCDRIVER]; |
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107 | |
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108 | /* |
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109 | * SCC1 interrupt handler |
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110 | */ |
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111 | static rtems_isr |
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112 | m360Enet_interrupt_handler (rtems_vector_number v) |
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113 | { |
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114 | /* |
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115 | * Frame received? |
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116 | */ |
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117 | if ((m360.scc1.sccm & 0x8) && (m360.scc1.scce & 0x8)) { |
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118 | m360.scc1.scce = 0x8; |
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119 | m360.scc1.sccm &= ~0x8; |
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120 | scc_softc[0].rxInterrupts++; |
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121 | rtems_event_send (scc_softc[0].rxDaemonTid, INTERRUPT_EVENT); |
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122 | } |
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123 | |
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124 | /* |
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125 | * Buffer transmitted or transmitter error? |
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126 | */ |
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127 | if ((m360.scc1.sccm & 0x12) && (m360.scc1.scce & 0x12)) { |
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128 | m360.scc1.scce = 0x12; |
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129 | m360.scc1.sccm &= ~0x12; |
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130 | scc_softc[0].txInterrupts++; |
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131 | rtems_event_send (scc_softc[0].txDaemonTid, INTERRUPT_EVENT); |
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132 | } |
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133 | m360.cisr = 1UL << 30; /* Clear SCC1 interrupt-in-service bit */ |
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134 | } |
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135 | |
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136 | /* |
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137 | * Initialize the ethernet hardware |
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138 | */ |
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139 | static void |
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140 | m360Enet_initialize_hardware (struct scc_softc *sc) |
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141 | { |
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142 | int i; |
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143 | unsigned char *hwaddr; |
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144 | rtems_status_code status; |
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145 | rtems_isr_entry old_handler; |
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146 | |
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147 | /* |
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148 | * Configure port A CLK1, CLK2, TXD1 and RXD1 pins |
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149 | */ |
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150 | m360.papar |= 0x303; |
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151 | m360.padir &= ~0x303; |
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152 | m360.paodr &= ~0x303; |
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153 | |
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154 | /* |
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155 | * Configure port C CTS1* and CD1* pins |
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156 | */ |
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157 | m360.pcpar &= ~0x30; |
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158 | m360.pcdir &= ~0x30; |
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159 | m360.pcso |= 0x30; |
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160 | |
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161 | /* |
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162 | * Connect CLK1 and CLK2 to SCC1 |
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163 | */ |
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164 | m360.sicr &= ~0xFF; |
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165 | m360.sicr |= (5 << 3) | 4; |
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166 | |
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167 | /* |
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168 | * Allocate mbuf pointers |
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169 | */ |
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170 | sc->rxMbuf = malloc (sc->rxBdCount * sizeof *sc->rxMbuf, M_MBUF, M_NOWAIT); |
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171 | sc->txMbuf = malloc (sc->txBdCount * sizeof *sc->txMbuf, M_MBUF, M_NOWAIT); |
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172 | if (!sc->rxMbuf || !sc->txMbuf) |
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173 | rtems_panic ("No memory for mbuf pointers"); |
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174 | |
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175 | /* |
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176 | * Set receiver and transmitter buffer descriptor bases |
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177 | */ |
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178 | sc->rxBdBase = M360AllocateBufferDescriptors(sc->rxBdCount); |
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179 | sc->txBdBase = M360AllocateBufferDescriptors(sc->txBdCount); |
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180 | m360.scc1p.rbase = (char *)sc->rxBdBase - (char *)&m360; |
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181 | m360.scc1p.tbase = (char *)sc->txBdBase - (char *)&m360; |
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182 | |
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183 | /* |
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184 | * Send "Init parameters" command |
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185 | */ |
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186 | M360ExecuteRISC (M360_CR_OP_INIT_RX_TX | M360_CR_CHAN_SCC1); |
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187 | |
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188 | /* |
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189 | * Set receive and transmit function codes |
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190 | */ |
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191 | m360.scc1p.rfcr = M360_RFCR_MOT | M360_RFCR_DMA_SPACE; |
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192 | m360.scc1p.tfcr = M360_TFCR_MOT | M360_TFCR_DMA_SPACE; |
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193 | |
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194 | /* |
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195 | * Set maximum receive buffer length |
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196 | */ |
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197 | m360.scc1p.mrblr = RBUF_SIZE; |
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198 | |
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199 | /* |
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200 | * Set CRC parameters |
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201 | */ |
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202 | m360.scc1p.un.ethernet.c_pres = 0xFFFFFFFF; |
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203 | m360.scc1p.un.ethernet.c_mask = 0xDEBB20E3; |
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204 | |
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205 | /* |
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206 | * Clear diagnostic counters |
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207 | */ |
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208 | m360.scc1p.un.ethernet.crcec = 0; |
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209 | m360.scc1p.un.ethernet.alec = 0; |
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210 | m360.scc1p.un.ethernet.disfc = 0; |
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211 | |
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212 | /* |
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213 | * Set pad value |
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214 | */ |
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215 | m360.scc1p.un.ethernet.pads = 0x8888; |
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216 | |
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217 | /* |
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218 | * Set retry limit |
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219 | */ |
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220 | m360.scc1p.un.ethernet.ret_lim = 15; |
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221 | |
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222 | /* |
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223 | * Set maximum and minimum frame length |
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224 | */ |
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225 | m360.scc1p.un.ethernet.mflr = 1518; |
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226 | m360.scc1p.un.ethernet.minflr = 64; |
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227 | m360.scc1p.un.ethernet.maxd1 = RBUF_SIZE; |
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228 | m360.scc1p.un.ethernet.maxd2 = RBUF_SIZE; |
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229 | |
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230 | /* |
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231 | * Clear group address hash table |
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232 | */ |
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233 | m360.scc1p.un.ethernet.gaddr1 = 0; |
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234 | m360.scc1p.un.ethernet.gaddr2 = 0; |
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235 | m360.scc1p.un.ethernet.gaddr3 = 0; |
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236 | m360.scc1p.un.ethernet.gaddr4 = 0; |
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237 | |
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238 | /* |
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239 | * Set our physical address |
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240 | */ |
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241 | hwaddr = sc->arpcom.ac_enaddr; |
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242 | m360.scc1p.un.ethernet.paddr_h = (hwaddr[5] << 8) | hwaddr[4]; |
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243 | m360.scc1p.un.ethernet.paddr_m = (hwaddr[3] << 8) | hwaddr[2]; |
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244 | m360.scc1p.un.ethernet.paddr_l = (hwaddr[1] << 8) | hwaddr[0]; |
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245 | |
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246 | /* |
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247 | * Aggressive retry |
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248 | */ |
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249 | m360.scc1p.un.ethernet.p_per = 0; |
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250 | |
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251 | /* |
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252 | * Clear individual address hash table |
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253 | */ |
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254 | m360.scc1p.un.ethernet.iaddr1 = 0; |
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255 | m360.scc1p.un.ethernet.iaddr2 = 0; |
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256 | m360.scc1p.un.ethernet.iaddr3 = 0; |
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257 | m360.scc1p.un.ethernet.iaddr4 = 0; |
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258 | |
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259 | /* |
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260 | * Set up receive buffer descriptors |
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261 | */ |
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262 | for (i = 0 ; i < sc->rxBdCount ; i++) |
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263 | (sc->rxBdBase + i)->status = 0; |
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264 | |
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265 | /* |
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266 | * Set up transmit buffer descriptors |
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267 | */ |
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268 | for (i = 0 ; i < sc->txBdCount ; i++) { |
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269 | (sc->txBdBase + i)->status = 0; |
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270 | sc->txMbuf[i] = NULL; |
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271 | } |
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272 | sc->txBdHead = sc->txBdTail = 0; |
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273 | sc->txBdActiveCount = 0; |
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274 | |
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275 | /* |
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276 | * Clear any outstanding events |
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277 | */ |
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278 | m360.scc1.scce = 0xFFFF; |
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279 | |
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280 | /* |
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281 | * Set up interrupts |
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282 | */ |
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283 | status = rtems_interrupt_catch (m360Enet_interrupt_handler, |
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284 | (m360.cicr & 0xE0) | 0x1E, |
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285 | &old_handler); |
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286 | if (status != RTEMS_SUCCESSFUL) |
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287 | rtems_panic ("Can't attach M360 SCC1 interrupt handler: %s\n", |
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288 | rtems_status_text (status)); |
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289 | m360.scc1.sccm = 0; /* No interrupts unmasked till necessary */ |
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290 | m360.cimr |= (1UL << 30); /* Enable SCC1 interrupt */ |
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291 | |
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292 | /* |
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293 | * Set up General SCC Mode Register |
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294 | * Ethernet configuration |
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295 | */ |
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296 | m360.scc1.gsmr_h = 0x0; |
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297 | m360.scc1.gsmr_l = 0x1088000c; |
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298 | |
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299 | /* |
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300 | * Set up data synchronization register |
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301 | * Ethernet synchronization pattern |
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302 | */ |
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303 | m360.scc1.dsr = 0xd555; |
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304 | |
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305 | /* |
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306 | * Set up protocol-specific mode register |
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307 | * Heartbeat check |
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308 | * No force collision |
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309 | * Discard short frames |
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310 | * Individual address mode |
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311 | * Ethernet CRC |
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312 | * Not promisuous |
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313 | * Ignore/accept broadcast packets as specified |
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314 | * Normal backoff timer |
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315 | * No loopback |
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316 | * No input sample at end of frame |
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317 | * 64-byte limit for late collision |
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318 | * Wait 22 bits before looking for start of frame delimiter |
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319 | * Disable full-duplex operation |
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320 | */ |
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321 | m360.scc1.psmr = 0x880A | (sc->acceptBroadcast ? 0 : 0x100); |
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322 | |
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323 | /* |
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324 | * Enable the TENA (RTS1*) pin |
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325 | */ |
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326 | #if (defined (M68360_ATLAS_HSB)) |
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327 | m360.pbpar |= 0x1000; |
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328 | m360.pbdir |= 0x1000; |
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329 | #else |
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330 | m360.pcpar |= 0x1; |
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331 | m360.pcdir &= ~0x1; |
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332 | #endif |
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333 | } |
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334 | |
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335 | /* |
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336 | * Soak up buffer descriptors that have been sent |
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337 | * Note that a buffer descriptor can't be retired as soon as it becomes |
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338 | * ready. The MC68360 Errata (May 96) says that, "If an Ethernet frame is |
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339 | * made up of multiple buffers, the user should not reuse the first buffer |
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340 | * descriptor until the last buffer descriptor of the frame has had its |
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341 | * ready bit cleared by the CPM". |
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342 | */ |
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343 | static void |
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344 | m360Enet_retire_tx_bd (struct scc_softc *sc) |
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345 | { |
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346 | rtems_unsigned16 status; |
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347 | int i; |
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348 | int nRetired; |
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349 | struct mbuf *m, *n; |
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350 | int retries = 0; |
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351 | int saveStatus = 0; |
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352 | |
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353 | i = sc->txBdTail; |
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354 | nRetired = 0; |
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355 | while ((sc->txBdActiveCount != 0) |
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356 | && (((status = (sc->txBdBase + i)->status) & M360_BD_READY) == 0)) { |
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357 | /* |
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358 | * Check for errors which stop the transmitter. |
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359 | */ |
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360 | if (status & (M360_BD_LATE_COLLISION | |
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361 | M360_BD_RETRY_LIMIT | |
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362 | M360_BD_UNDERRUN)) { |
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363 | int j; |
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364 | |
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365 | if (status & M360_BD_LATE_COLLISION) |
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366 | sc->txLateCollision++; |
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367 | if (status & M360_BD_RETRY_LIMIT) |
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368 | sc->txRetryLimit++; |
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369 | if (status & M360_BD_UNDERRUN) |
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370 | sc->txUnderrun++; |
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371 | |
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372 | /* |
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373 | * Reenable buffer descriptors |
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374 | */ |
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375 | j = sc->txBdTail; |
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376 | for (;;) { |
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377 | status = (sc->txBdBase + j)->status; |
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378 | if (status & M360_BD_READY) |
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379 | break; |
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380 | (sc->txBdBase + j)->status = M360_BD_READY | |
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381 | (status & (M360_BD_PAD | |
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382 | M360_BD_WRAP | |
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383 | M360_BD_INTERRUPT | |
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384 | M360_BD_LAST | |
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385 | M360_BD_TX_CRC)); |
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386 | if (status & M360_BD_LAST) |
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387 | break; |
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388 | if (++j == sc->txBdCount) |
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389 | j = 0; |
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390 | } |
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391 | |
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392 | /* |
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393 | * Move transmitter back to the first |
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394 | * buffer descriptor in the frame. |
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395 | */ |
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396 | m360.scc1p._tbptr = m360.scc1p.tbase + |
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397 | sc->txBdTail * sizeof (m360BufferDescriptor_t); |
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398 | |
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399 | /* |
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400 | * Restart the transmitter |
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401 | */ |
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402 | M360ExecuteRISC (M360_CR_OP_RESTART_TX | M360_CR_CHAN_SCC1); |
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403 | continue; |
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404 | } |
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405 | saveStatus |= status; |
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406 | retries += (status >> 2) & 0xF; |
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407 | nRetired++; |
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408 | if (status & M360_BD_LAST) { |
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409 | /* |
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410 | * A full frame has been transmitted. |
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411 | * Free all the associated buffer descriptors. |
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412 | */ |
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413 | if (saveStatus & M360_BD_DEFER) |
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414 | sc->txDeferred++; |
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415 | if (saveStatus & M360_BD_HEARTBEAT) |
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416 | sc->txHeartbeat++; |
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417 | if (saveStatus & M360_BD_CARRIER_LOST) |
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418 | sc->txLostCarrier++; |
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419 | saveStatus = 0; |
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420 | sc->txRetry += retries; |
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421 | retries = 0; |
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422 | sc->txBdActiveCount -= nRetired; |
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423 | while (nRetired) { |
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424 | nRetired--; |
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425 | m = sc->txMbuf[sc->txBdTail]; |
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426 | MFREE (m, n); |
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427 | if (++sc->txBdTail == sc->txBdCount) |
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428 | sc->txBdTail = 0; |
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429 | } |
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430 | } |
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431 | if (++i == sc->txBdCount) |
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432 | i = 0; |
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433 | } |
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434 | } |
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435 | |
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436 | /* |
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437 | * SCC reader task |
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438 | */ |
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439 | static void |
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440 | scc_rxDaemon (void *arg) |
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441 | { |
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442 | struct scc_softc *sc = (struct scc_softc *)arg; |
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443 | struct ifnet *ifp = &sc->arpcom.ac_if; |
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444 | struct mbuf *m; |
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445 | rtems_unsigned16 status; |
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446 | volatile m360BufferDescriptor_t *rxBd; |
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447 | int rxBdIndex; |
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448 | |
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449 | /* |
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450 | * Allocate space for incoming packets and start reception |
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451 | */ |
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452 | for (rxBdIndex = 0 ; ;) { |
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453 | rxBd = sc->rxBdBase + rxBdIndex; |
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454 | MGETHDR (m, M_WAIT, MT_DATA); |
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455 | MCLGET (m, M_WAIT); |
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456 | m->m_pkthdr.rcvif = ifp; |
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457 | sc->rxMbuf[rxBdIndex] = m; |
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458 | rxBd->buffer = mtod (m, void *); |
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459 | if (++rxBdIndex == sc->rxBdCount) { |
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460 | rxBd->status = M360_BD_EMPTY | M360_BD_INTERRUPT | M360_BD_WRAP; |
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461 | break; |
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462 | } |
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463 | rxBd->status = M360_BD_EMPTY | M360_BD_INTERRUPT; |
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464 | } |
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465 | |
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466 | /* |
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467 | * Input packet handling loop |
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468 | */ |
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469 | rxBdIndex = 0; |
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470 | for (;;) { |
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471 | rxBd = sc->rxBdBase + rxBdIndex; |
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472 | |
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473 | /* |
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474 | * Wait for packet if there's not one ready |
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475 | */ |
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476 | if ((status = rxBd->status) & M360_BD_EMPTY) { |
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477 | /* |
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478 | * Clear old events |
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479 | */ |
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480 | m360.scc1.scce = 0x8; |
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481 | |
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482 | /* |
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483 | * Wait for packet |
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484 | * Note that the buffer descriptor is checked |
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485 | * *before* the event wait -- this catches the |
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486 | * possibility that a packet arrived between the |
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487 | * `if' above, and the clearing of the event register. |
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488 | */ |
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489 | while ((status = rxBd->status) & M360_BD_EMPTY) { |
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490 | rtems_interrupt_level level; |
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491 | rtems_event_set events; |
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492 | |
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493 | /* |
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494 | * Unmask RXF (Full frame received) event |
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495 | */ |
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496 | rtems_interrupt_disable (level); |
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497 | m360.scc1.sccm |= 0x8; |
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498 | rtems_interrupt_enable (level); |
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499 | |
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500 | rtems_bsdnet_event_receive (INTERRUPT_EVENT, |
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501 | RTEMS_WAIT|RTEMS_EVENT_ANY, |
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502 | RTEMS_NO_TIMEOUT, |
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503 | &events); |
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504 | } |
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505 | } |
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506 | |
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507 | /* |
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508 | * Check that packet is valid |
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509 | */ |
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510 | if ((status & (M360_BD_LAST | |
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511 | M360_BD_FIRST_IN_FRAME | |
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512 | M360_BD_LONG | |
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513 | M360_BD_NONALIGNED | |
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514 | M360_BD_SHORT | |
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515 | M360_BD_CRC_ERROR | |
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516 | M360_BD_OVERRUN | |
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517 | M360_BD_COLLISION)) == |
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518 | (M360_BD_LAST | |
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519 | M360_BD_FIRST_IN_FRAME)) { |
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520 | /* |
---|
521 | * Pass the packet up the chain. |
---|
522 | * FIXME: Packet filtering hook could be done here. |
---|
523 | */ |
---|
524 | struct ether_header *eh; |
---|
525 | |
---|
526 | m = sc->rxMbuf[rxBdIndex]; |
---|
527 | m->m_len = m->m_pkthdr.len = rxBd->length - |
---|
528 | sizeof(rtems_unsigned32) - |
---|
529 | sizeof(struct ether_header); |
---|
530 | eh = mtod (m, struct ether_header *); |
---|
531 | m->m_data += sizeof(struct ether_header); |
---|
532 | ether_input (ifp, eh, m); |
---|
533 | |
---|
534 | /* |
---|
535 | * Allocate a new mbuf |
---|
536 | */ |
---|
537 | MGETHDR (m, M_WAIT, MT_DATA); |
---|
538 | MCLGET (m, M_WAIT); |
---|
539 | m->m_pkthdr.rcvif = ifp; |
---|
540 | sc->rxMbuf[rxBdIndex] = m; |
---|
541 | rxBd->buffer = mtod (m, void *); |
---|
542 | } |
---|
543 | else { |
---|
544 | /* |
---|
545 | * Something went wrong with the reception |
---|
546 | */ |
---|
547 | if (!(status & M360_BD_LAST)) |
---|
548 | sc->rxNotLast++; |
---|
549 | if (!(status & M360_BD_FIRST_IN_FRAME)) |
---|
550 | sc->rxNotFirst++; |
---|
551 | if (status & M360_BD_LONG) |
---|
552 | sc->rxGiant++; |
---|
553 | if (status & M360_BD_NONALIGNED) |
---|
554 | sc->rxNonOctet++; |
---|
555 | if (status & M360_BD_SHORT) |
---|
556 | sc->rxRunt++; |
---|
557 | if (status & M360_BD_CRC_ERROR) |
---|
558 | sc->rxBadCRC++; |
---|
559 | if (status & M360_BD_OVERRUN) |
---|
560 | sc->rxOverrun++; |
---|
561 | if (status & M360_BD_COLLISION) |
---|
562 | sc->rxCollision++; |
---|
563 | } |
---|
564 | |
---|
565 | /* |
---|
566 | * Reenable the buffer descriptor |
---|
567 | */ |
---|
568 | rxBd->status = (status & (M360_BD_WRAP | M360_BD_INTERRUPT)) | M360_BD_EMPTY; |
---|
569 | |
---|
570 | /* |
---|
571 | * Move to next buffer descriptor |
---|
572 | */ |
---|
573 | if (++rxBdIndex == sc->rxBdCount) |
---|
574 | rxBdIndex = 0; |
---|
575 | } |
---|
576 | } |
---|
577 | |
---|
578 | static void |
---|
579 | sendpacket (struct ifnet *ifp, struct mbuf *m) |
---|
580 | { |
---|
581 | struct scc_softc *sc = ifp->if_softc; |
---|
582 | volatile m360BufferDescriptor_t *firstTxBd, *txBd; |
---|
583 | struct mbuf *l = NULL; |
---|
584 | rtems_unsigned16 status; |
---|
585 | int nAdded; |
---|
586 | |
---|
587 | /* |
---|
588 | * Free up buffer descriptors |
---|
589 | */ |
---|
590 | m360Enet_retire_tx_bd (sc); |
---|
591 | |
---|
592 | /* |
---|
593 | * Set up the transmit buffer descriptors. |
---|
594 | * No need to pad out short packets since the |
---|
595 | * hardware takes care of that automatically. |
---|
596 | * No need to copy the packet to a contiguous buffer |
---|
597 | * since the hardware is capable of scatter/gather DMA. |
---|
598 | */ |
---|
599 | status = 0; |
---|
600 | nAdded = 0; |
---|
601 | txBd = firstTxBd = sc->txBdBase + sc->txBdHead; |
---|
602 | while (m) { |
---|
603 | /* |
---|
604 | * There are more mbufs in the packet than there |
---|
605 | * are transmit buffer descriptors. |
---|
606 | * Coalesce into a single buffer. |
---|
607 | */ |
---|
608 | if (nAdded == sc->txBdCount) { |
---|
609 | struct mbuf *nm; |
---|
610 | int j; |
---|
611 | char *dest; |
---|
612 | |
---|
613 | /* |
---|
614 | * Get the pointer to the first mbuf of the packet |
---|
615 | */ |
---|
616 | if (sc->txBdTail != sc->txBdHead) |
---|
617 | rtems_panic ("sendpacket coalesce"); |
---|
618 | m = sc->txMbuf[sc->txBdTail]; |
---|
619 | |
---|
620 | /* |
---|
621 | * Rescind the buffer descriptor READY bits |
---|
622 | */ |
---|
623 | for (j = 0 ; j < sc->txBdCount ; j++) |
---|
624 | (sc->txBdBase + j)->status = 0; |
---|
625 | |
---|
626 | /* |
---|
627 | * Allocate an mbuf cluster |
---|
628 | * Toss the packet if allocation fails |
---|
629 | */ |
---|
630 | MGETHDR (nm, M_DONTWAIT, MT_DATA); |
---|
631 | if (nm == NULL) { |
---|
632 | sc->txCoalesceFailed++; |
---|
633 | m_freem (m); |
---|
634 | return; |
---|
635 | } |
---|
636 | MCLGET (nm, M_DONTWAIT); |
---|
637 | if (nm->m_ext.ext_buf == NULL) { |
---|
638 | sc->txCoalesceFailed++; |
---|
639 | m_freem (m); |
---|
640 | m_free (nm); |
---|
641 | return; |
---|
642 | } |
---|
643 | nm->m_pkthdr = m->m_pkthdr; |
---|
644 | nm->m_len = nm->m_pkthdr.len; |
---|
645 | |
---|
646 | /* |
---|
647 | * Copy data from packet chain to mbuf cluster |
---|
648 | */ |
---|
649 | sc->txCoalesced++; |
---|
650 | dest = nm->m_ext.ext_buf; |
---|
651 | while (m) { |
---|
652 | struct mbuf *n; |
---|
653 | |
---|
654 | if (m->m_len) { |
---|
655 | memcpy (dest, mtod(m, caddr_t), m->m_len); |
---|
656 | dest += m->m_len; |
---|
657 | } |
---|
658 | MFREE (m, n); |
---|
659 | m = n; |
---|
660 | } |
---|
661 | |
---|
662 | /* |
---|
663 | * Redo the send with the new mbuf cluster |
---|
664 | */ |
---|
665 | m = nm; |
---|
666 | nAdded = 0; |
---|
667 | status = 0; |
---|
668 | continue; |
---|
669 | } |
---|
670 | |
---|
671 | /* |
---|
672 | * Wait for buffer descriptor to become available. |
---|
673 | */ |
---|
674 | if ((sc->txBdActiveCount + nAdded) == sc->txBdCount) { |
---|
675 | /* |
---|
676 | * Clear old events |
---|
677 | */ |
---|
678 | m360.scc1.scce = 0x12; |
---|
679 | |
---|
680 | /* |
---|
681 | * Wait for buffer descriptor to become available. |
---|
682 | * Note that the buffer descriptors are checked |
---|
683 | * *before* entering the wait loop -- this catches |
---|
684 | * the possibility that a buffer descriptor became |
---|
685 | * available between the `if' above, and the clearing |
---|
686 | * of the event register. |
---|
687 | * This is to catch the case where the transmitter |
---|
688 | * stops in the middle of a frame -- and only the |
---|
689 | * last buffer descriptor in a frame can generate |
---|
690 | * an interrupt. |
---|
691 | */ |
---|
692 | m360Enet_retire_tx_bd (sc); |
---|
693 | while ((sc->txBdActiveCount + nAdded) == sc->txBdCount) { |
---|
694 | rtems_interrupt_level level; |
---|
695 | rtems_event_set events; |
---|
696 | |
---|
697 | /* |
---|
698 | * Unmask TXB (buffer transmitted) and |
---|
699 | * TXE (transmitter error) events. |
---|
700 | */ |
---|
701 | rtems_interrupt_disable (level); |
---|
702 | m360.scc1.sccm |= 0x12; |
---|
703 | rtems_interrupt_enable (level); |
---|
704 | rtems_bsdnet_event_receive (INTERRUPT_EVENT, |
---|
705 | RTEMS_WAIT|RTEMS_EVENT_ANY, |
---|
706 | RTEMS_NO_TIMEOUT, |
---|
707 | &events); |
---|
708 | m360Enet_retire_tx_bd (sc); |
---|
709 | } |
---|
710 | } |
---|
711 | |
---|
712 | /* |
---|
713 | * The IP fragmentation routine in ip_output |
---|
714 | * can produce packet fragments with zero length. |
---|
715 | */ |
---|
716 | if (m->m_len) { |
---|
717 | /* |
---|
718 | * Fill in the buffer descriptor. |
---|
719 | * Don't set the READY flag in the first buffer |
---|
720 | * descriptor till the whole packet has been readied. |
---|
721 | */ |
---|
722 | txBd = sc->txBdBase + sc->txBdHead; |
---|
723 | txBd->buffer = mtod (m, void *); |
---|
724 | txBd->length = m->m_len; |
---|
725 | sc->txMbuf[sc->txBdHead] = m; |
---|
726 | status = nAdded ? M360_BD_READY : 0; |
---|
727 | if (++sc->txBdHead == sc->txBdCount) { |
---|
728 | status |= M360_BD_WRAP; |
---|
729 | sc->txBdHead = 0; |
---|
730 | } |
---|
731 | txBd->status = status; |
---|
732 | l = m; |
---|
733 | m = m->m_next; |
---|
734 | nAdded++; |
---|
735 | } |
---|
736 | else { |
---|
737 | /* |
---|
738 | * Just toss empty mbufs |
---|
739 | */ |
---|
740 | struct mbuf *n; |
---|
741 | MFREE (m, n); |
---|
742 | m = n; |
---|
743 | if (l != NULL) |
---|
744 | l->m_next = m; |
---|
745 | } |
---|
746 | } |
---|
747 | if (nAdded) { |
---|
748 | /* |
---|
749 | * Send the packet |
---|
750 | */ |
---|
751 | txBd->status = status | M360_BD_PAD | M360_BD_LAST | M360_BD_TX_CRC | M360_BD_INTERRUPT; |
---|
752 | firstTxBd->status |= M360_BD_READY; |
---|
753 | sc->txBdActiveCount += nAdded; |
---|
754 | } |
---|
755 | } |
---|
756 | |
---|
757 | /* |
---|
758 | * Driver transmit daemon |
---|
759 | */ |
---|
760 | void |
---|
761 | scc_txDaemon (void *arg) |
---|
762 | { |
---|
763 | struct scc_softc *sc = (struct scc_softc *)arg; |
---|
764 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
765 | struct mbuf *m; |
---|
766 | rtems_event_set events; |
---|
767 | |
---|
768 | for (;;) { |
---|
769 | /* |
---|
770 | * Wait for packet |
---|
771 | */ |
---|
772 | rtems_bsdnet_event_receive (START_TRANSMIT_EVENT, RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT, &events); |
---|
773 | |
---|
774 | /* |
---|
775 | * Send packets till queue is empty |
---|
776 | */ |
---|
777 | for (;;) { |
---|
778 | /* |
---|
779 | * Get the next mbuf chain to transmit. |
---|
780 | */ |
---|
781 | IF_DEQUEUE(&ifp->if_snd, m); |
---|
782 | if (!m) |
---|
783 | break; |
---|
784 | sendpacket (ifp, m); |
---|
785 | } |
---|
786 | ifp->if_flags &= ~IFF_OACTIVE; |
---|
787 | } |
---|
788 | } |
---|
789 | |
---|
790 | /* |
---|
791 | * Send packet (caller provides header). |
---|
792 | */ |
---|
793 | static void |
---|
794 | scc_start (struct ifnet *ifp) |
---|
795 | { |
---|
796 | struct scc_softc *sc = ifp->if_softc; |
---|
797 | |
---|
798 | rtems_event_send (sc->txDaemonTid, START_TRANSMIT_EVENT); |
---|
799 | ifp->if_flags |= IFF_OACTIVE; |
---|
800 | } |
---|
801 | |
---|
802 | /* |
---|
803 | * Initialize and start the device |
---|
804 | */ |
---|
805 | static void |
---|
806 | scc_init (void *arg) |
---|
807 | { |
---|
808 | struct scc_softc *sc = arg; |
---|
809 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
810 | |
---|
811 | if (sc->txDaemonTid == 0) { |
---|
812 | |
---|
813 | /* |
---|
814 | * Set up SCC hardware |
---|
815 | */ |
---|
816 | m360Enet_initialize_hardware (sc); |
---|
817 | |
---|
818 | /* |
---|
819 | * Start driver tasks |
---|
820 | */ |
---|
821 | sc->txDaemonTid = rtems_bsdnet_newproc ("SCtx", 4096, scc_txDaemon, sc); |
---|
822 | sc->rxDaemonTid = rtems_bsdnet_newproc ("SCrx", 4096, scc_rxDaemon, sc); |
---|
823 | |
---|
824 | } |
---|
825 | |
---|
826 | /* |
---|
827 | * Set flags appropriately |
---|
828 | */ |
---|
829 | if (ifp->if_flags & IFF_PROMISC) |
---|
830 | m360.scc1.psmr |= 0x200; |
---|
831 | else |
---|
832 | m360.scc1.psmr &= ~0x200; |
---|
833 | |
---|
834 | /* |
---|
835 | * Tell the world that we're running. |
---|
836 | */ |
---|
837 | ifp->if_flags |= IFF_RUNNING; |
---|
838 | |
---|
839 | /* |
---|
840 | * Enable receiver and transmitter |
---|
841 | */ |
---|
842 | m360.scc1.gsmr_l |= 0x30; |
---|
843 | } |
---|
844 | |
---|
845 | /* |
---|
846 | * Stop the device |
---|
847 | */ |
---|
848 | static void |
---|
849 | scc_stop (struct scc_softc *sc) |
---|
850 | { |
---|
851 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
852 | |
---|
853 | ifp->if_flags &= ~IFF_RUNNING; |
---|
854 | |
---|
855 | /* |
---|
856 | * Shut down receiver and transmitter |
---|
857 | */ |
---|
858 | m360.scc1.gsmr_l &= ~0x30; |
---|
859 | } |
---|
860 | |
---|
861 | |
---|
862 | /* |
---|
863 | * Show interface statistics |
---|
864 | */ |
---|
865 | static void |
---|
866 | scc_stats (struct scc_softc *sc) |
---|
867 | { |
---|
868 | printf (" Rx Interrupts:%-8lu", sc->rxInterrupts); |
---|
869 | printf (" Not First:%-8lu", sc->rxNotFirst); |
---|
870 | printf (" Not Last:%-8lu\n", sc->rxNotLast); |
---|
871 | printf (" Giant:%-8lu", sc->rxGiant); |
---|
872 | printf (" Runt:%-8lu", sc->rxRunt); |
---|
873 | printf (" Non-octet:%-8lu\n", sc->rxNonOctet); |
---|
874 | printf (" Bad CRC:%-8lu", sc->rxBadCRC); |
---|
875 | printf (" Overrun:%-8lu", sc->rxOverrun); |
---|
876 | printf (" Collision:%-8lu\n", sc->rxCollision); |
---|
877 | printf (" Discarded:%-8lu\n", (unsigned long)m360.scc1p.un.ethernet.disfc); |
---|
878 | |
---|
879 | printf (" Tx Interrupts:%-8lu", sc->txInterrupts); |
---|
880 | printf (" Deferred:%-8lu", sc->txDeferred); |
---|
881 | printf (" Missed Hearbeat:%-8lu\n", sc->txHeartbeat); |
---|
882 | printf (" No Carrier:%-8lu", sc->txLostCarrier); |
---|
883 | printf ("Retransmit Limit:%-8lu", sc->txRetryLimit); |
---|
884 | printf (" Late Collision:%-8lu\n", sc->txLateCollision); |
---|
885 | printf (" Underrun:%-8lu", sc->txUnderrun); |
---|
886 | printf (" Raw output wait:%-8lu", sc->txRawWait); |
---|
887 | printf (" Coalesced:%-8lu\n", sc->txCoalesced); |
---|
888 | printf (" Coalesce failed:%-8lu", sc->txCoalesceFailed); |
---|
889 | printf (" Retries:%-8lu\n", sc->txRetry); |
---|
890 | } |
---|
891 | |
---|
892 | /* |
---|
893 | * Driver ioctl handler |
---|
894 | */ |
---|
895 | static int |
---|
896 | scc_ioctl (struct ifnet *ifp, int command, caddr_t data) |
---|
897 | { |
---|
898 | struct scc_softc *sc = ifp->if_softc; |
---|
899 | int error = 0; |
---|
900 | |
---|
901 | switch (command) { |
---|
902 | case SIOCGIFADDR: |
---|
903 | case SIOCSIFADDR: |
---|
904 | ether_ioctl (ifp, command, data); |
---|
905 | break; |
---|
906 | |
---|
907 | case SIOCSIFFLAGS: |
---|
908 | switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { |
---|
909 | case IFF_RUNNING: |
---|
910 | scc_stop (sc); |
---|
911 | break; |
---|
912 | |
---|
913 | case IFF_UP: |
---|
914 | scc_init (sc); |
---|
915 | break; |
---|
916 | |
---|
917 | case IFF_UP | IFF_RUNNING: |
---|
918 | scc_stop (sc); |
---|
919 | scc_init (sc); |
---|
920 | break; |
---|
921 | |
---|
922 | default: |
---|
923 | break; |
---|
924 | } |
---|
925 | break; |
---|
926 | |
---|
927 | case SIO_RTEMS_SHOW_STATS: |
---|
928 | scc_stats (sc); |
---|
929 | break; |
---|
930 | |
---|
931 | /* |
---|
932 | * FIXME: All sorts of multicast commands need to be added here! |
---|
933 | */ |
---|
934 | default: |
---|
935 | error = EINVAL; |
---|
936 | break; |
---|
937 | } |
---|
938 | return error; |
---|
939 | } |
---|
940 | |
---|
941 | /* |
---|
942 | * Attach an SCC driver to the system |
---|
943 | */ |
---|
944 | int |
---|
945 | rtems_scc1_driver_attach (struct rtems_bsdnet_ifconfig *config, int attaching) |
---|
946 | { |
---|
947 | struct scc_softc *sc; |
---|
948 | struct ifnet *ifp; |
---|
949 | int mtu; |
---|
950 | int unitNumber; |
---|
951 | char *unitName; |
---|
952 | |
---|
953 | /* |
---|
954 | * Make sure we're really being attached |
---|
955 | */ |
---|
956 | if (!attaching) { |
---|
957 | printf ("SCC1 driver can not be detached.\n"); |
---|
958 | return 0; |
---|
959 | } |
---|
960 | |
---|
961 | /* |
---|
962 | * Parse driver name |
---|
963 | */ |
---|
964 | if ((unitNumber = rtems_bsdnet_parse_driver_name (config, &unitName)) < 0) |
---|
965 | return 0; |
---|
966 | |
---|
967 | /* |
---|
968 | * Is driver free? |
---|
969 | */ |
---|
970 | if ((unitNumber <= 0) || (unitNumber > NSCCDRIVER)) { |
---|
971 | printf ("Bad SCC unit number.\n"); |
---|
972 | return 0; |
---|
973 | } |
---|
974 | sc = &scc_softc[unitNumber - 1]; |
---|
975 | ifp = &sc->arpcom.ac_if; |
---|
976 | if (ifp->if_softc != NULL) { |
---|
977 | printf ("Driver already in use.\n"); |
---|
978 | return 0; |
---|
979 | } |
---|
980 | |
---|
981 | /* |
---|
982 | * Process options |
---|
983 | */ |
---|
984 | if (config->hardware_address) { |
---|
985 | memcpy (sc->arpcom.ac_enaddr, config->hardware_address, ETHER_ADDR_LEN); |
---|
986 | } |
---|
987 | else { |
---|
988 | /* |
---|
989 | * The first 4 bytes of the bootstrap prom |
---|
990 | * contain the value loaded into the stack |
---|
991 | * pointer as part of the CPU32's hardware |
---|
992 | * reset exception handler. The following |
---|
993 | * 4 bytes contain the value loaded into the |
---|
994 | * program counter. The boards' Ethernet |
---|
995 | * address is stored in the six bytes |
---|
996 | * immediately preceding this initial |
---|
997 | * program counter value. |
---|
998 | * |
---|
999 | * See start360/start360.s. |
---|
1000 | */ |
---|
1001 | extern void *_RomBase; /* From linkcmds */ |
---|
1002 | const unsigned long *ExceptionVectors; |
---|
1003 | const unsigned char *entryPoint; |
---|
1004 | |
---|
1005 | /* |
---|
1006 | * Sanity check -- assume entry point must be |
---|
1007 | * within 1 MByte of beginning of boot ROM. |
---|
1008 | */ |
---|
1009 | ExceptionVectors = (const unsigned long *)&_RomBase; |
---|
1010 | entryPoint = (const unsigned char *)ExceptionVectors[1]; |
---|
1011 | if (((unsigned long)entryPoint - (unsigned long)ExceptionVectors) |
---|
1012 | >= (1 * 1024 * 1024)) { |
---|
1013 | printf ("Warning -- Ethernet address can not be found in bootstrap PROM.\n"); |
---|
1014 | sc->arpcom.ac_enaddr[0] = 0x08; |
---|
1015 | sc->arpcom.ac_enaddr[1] = 0xF3; |
---|
1016 | sc->arpcom.ac_enaddr[2] = 0x3E; |
---|
1017 | sc->arpcom.ac_enaddr[3] = 0xC2; |
---|
1018 | sc->arpcom.ac_enaddr[4] = 0x7E; |
---|
1019 | sc->arpcom.ac_enaddr[5] = 0x38; |
---|
1020 | } |
---|
1021 | else { |
---|
1022 | memcpy (sc->arpcom.ac_enaddr, entryPoint - ETHER_ADDR_LEN, ETHER_ADDR_LEN); |
---|
1023 | } |
---|
1024 | } |
---|
1025 | if (config->mtu) |
---|
1026 | mtu = config->mtu; |
---|
1027 | else |
---|
1028 | mtu = ETHERMTU; |
---|
1029 | if (config->rbuf_count) |
---|
1030 | sc->rxBdCount = config->rbuf_count; |
---|
1031 | else |
---|
1032 | sc->rxBdCount = RX_BUF_COUNT; |
---|
1033 | if (config->xbuf_count) |
---|
1034 | sc->txBdCount = config->xbuf_count; |
---|
1035 | else |
---|
1036 | sc->txBdCount = TX_BUF_COUNT * TX_BD_PER_BUF; |
---|
1037 | sc->acceptBroadcast = !config->ignore_broadcast; |
---|
1038 | |
---|
1039 | /* |
---|
1040 | * Set up network interface values |
---|
1041 | */ |
---|
1042 | ifp->if_softc = sc; |
---|
1043 | ifp->if_unit = unitNumber; |
---|
1044 | ifp->if_name = unitName; |
---|
1045 | ifp->if_mtu = mtu; |
---|
1046 | ifp->if_init = scc_init; |
---|
1047 | ifp->if_ioctl = scc_ioctl; |
---|
1048 | ifp->if_start = scc_start; |
---|
1049 | ifp->if_output = ether_output; |
---|
1050 | ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; |
---|
1051 | if (ifp->if_snd.ifq_maxlen == 0) |
---|
1052 | ifp->if_snd.ifq_maxlen = ifqmaxlen; |
---|
1053 | |
---|
1054 | /* |
---|
1055 | * Attach the interface |
---|
1056 | */ |
---|
1057 | if_attach (ifp); |
---|
1058 | ether_ifattach (ifp); |
---|
1059 | return 1; |
---|
1060 | } |
---|