1 | /* |
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2 | * RTEMS driver for M68360 SCC1 Ethernet |
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3 | * W. Eric Norum |
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4 | * Saskatchewan Accelerator Laboratory |
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5 | * University of Saskatchewan |
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6 | * Saskatoon, Saskatchewan, CANADA |
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7 | * eric@skatter.usask.ca |
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8 | * |
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9 | * $Id$ |
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10 | * |
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11 | * Modify for Motorola 68en320 Ethernet Controller |
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12 | * CXR S.A. France - 2000/09/14 - franckj@cxr.fr |
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13 | */ |
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14 | #include <bsp.h> |
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15 | #include <stdio.h> |
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16 | #include <rtems/error.h> |
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17 | #include <m302_int.h> |
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18 | #include <rtems/rtems_bsdnet.h> |
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19 | |
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20 | #include <sys/param.h> |
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21 | #include <sys/mbuf.h> |
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22 | #include <sys/socket.h> |
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23 | #include <sys/sockio.h> |
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24 | #include <errno.h> |
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25 | |
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26 | #include <net/if.h> |
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27 | |
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28 | #include <netinet/in.h> |
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29 | #include <netinet/if_ether.h> |
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30 | #include <rtems/m68k/m68302.h> |
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31 | |
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32 | /* |
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33 | * Number of SCCs supported by this driver |
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34 | */ |
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35 | #define NSCCDRIVER 1 |
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36 | |
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37 | /* |
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38 | * Default number of buffer descriptors set aside for this driver. |
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39 | * The number of transmit buffer descriptors has to be quite large |
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40 | * since a single frame often uses four or more buffer descriptors. |
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41 | */ |
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42 | #define RX_BUF_COUNT 64 |
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43 | #define TX_BUF_COUNT 64 |
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44 | |
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45 | /* |
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46 | * RTEMS event used by interrupt handler to signal driver tasks. |
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47 | * This must not be any of the events used by the network task synchronization. |
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48 | */ |
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49 | #define INTERRUPT_EVENT RTEMS_EVENT_1 |
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50 | |
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51 | /* |
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52 | * RTEMS event used to start transmit daemon. |
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53 | * This must not be the same as INTERRUPT_EVENT. |
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54 | */ |
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55 | #define START_TRANSMIT_EVENT RTEMS_EVENT_2 |
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56 | |
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57 | /* |
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58 | * Receive buffer size -- Allow for a full ethernet packet including CRC |
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59 | */ |
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60 | #define RBUF_SIZE 1520 |
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61 | |
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62 | #if (MCLBYTES < RBUF_SIZE) |
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63 | # error "Driver must have MCLBYTES > RBUF_SIZE" |
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64 | #endif |
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65 | |
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66 | static struct m68302_imp * a_m68302_imp; |
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67 | |
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68 | #define M302_ETHER_IVECTOR 0x40 |
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69 | |
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70 | /* |
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71 | * Per-device data |
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72 | */ |
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73 | struct scc_softc { |
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74 | struct arpcom arpcom; |
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75 | struct mbuf **rxMbuf; |
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76 | struct mbuf **txMbuf; |
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77 | int acceptBroadcast; |
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78 | int rxBdCount; |
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79 | int txBdCount; |
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80 | int txBdHead; |
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81 | int txBdTail; |
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82 | int txBdActiveCount; |
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83 | |
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84 | struct m68302_scc_bd *rxBdBase; |
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85 | struct m68302_scc_bd *txBdBase; |
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86 | |
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87 | rtems_id rxDaemonTid; |
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88 | rtems_id txDaemonTid; |
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89 | |
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90 | /* |
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91 | * Statistics |
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92 | */ |
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93 | unsigned long rxInterrupts; |
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94 | unsigned long rxNotFirst; |
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95 | unsigned long rxNotLast; |
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96 | unsigned long rxGiant; |
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97 | unsigned long rxNonOctet; |
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98 | unsigned long rxRunt; |
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99 | unsigned long rxBadCRC; |
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100 | unsigned long rxOverrun; |
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101 | unsigned long rxCollision; |
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102 | |
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103 | unsigned long txInterrupts; |
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104 | unsigned long txDeferred; |
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105 | unsigned long txHeartbeat; |
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106 | unsigned long txLateCollision; |
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107 | unsigned long txRetryLimit; |
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108 | unsigned long txUnderrun; |
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109 | unsigned long txLostCarrier; |
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110 | unsigned long txRawWait; |
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111 | unsigned long txCoalesced; |
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112 | unsigned long txCoalesceFailed; |
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113 | unsigned long txRetry; |
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114 | }; |
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115 | static struct scc_softc scc_softc[NSCCDRIVER]; |
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116 | |
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117 | /* |
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118 | * interrupt handler |
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119 | */ |
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120 | static rtems_isr |
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121 | m302Enet_interrupt_handler (rtems_vector_number v) |
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122 | { |
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123 | |
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124 | /* |
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125 | * Frame received? |
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126 | */ |
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127 | if (M68en302imp_intr_event & INTR_EVENT_BIT_RFINT) { |
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128 | M68en302imp_intr_event = INTR_EVENT_BIT_RFINT; |
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129 | M68en302imp_intr_mask &= ~INTR_MASK_BIT_RFIEN; |
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130 | scc_softc[0].rxInterrupts++; |
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131 | rtems_event_send (scc_softc[0].rxDaemonTid, INTERRUPT_EVENT); |
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132 | } |
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133 | |
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134 | /* |
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135 | * Buffer transmitted or transmitter error? |
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136 | */ |
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137 | if ((M68en302imp_intr_event & INTR_EVENT_BIT_TFINT) || |
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138 | ((M68en302imp_intr_event & INTR_EVENT_BIT_TXB))){ |
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139 | M68en302imp_intr_event = INTR_EVENT_BIT_TFINT | INTR_EVENT_BIT_TXB; |
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140 | M68en302imp_intr_mask &= ~(INTR_MASK_BIT_TFIEN | INTR_MASK_BIT_TXIEN); |
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141 | scc_softc[0].txInterrupts++; |
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142 | rtems_event_send (scc_softc[0].txDaemonTid, INTERRUPT_EVENT); |
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143 | } |
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144 | } |
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145 | |
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146 | /* |
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147 | * Initialize the ethernet hardware |
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148 | */ |
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149 | static void |
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150 | m302Enet_initialize_hardware (struct scc_softc *sc) |
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151 | { |
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152 | int i; |
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153 | unsigned char *hwaddr; |
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154 | rtems_status_code status; |
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155 | rtems_isr_entry old_handler; |
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156 | struct m68302_scc_bd *a_bd; /* Buffer Descriptor pointer */ |
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157 | ushort *cam; |
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158 | #define LBK 0x0008 |
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159 | #define DSQE 0x0010 |
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160 | #define FDE 0x0020 |
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161 | |
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162 | /* |
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163 | * standard loopback |
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164 | */ |
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165 | M68302imp_port_data (1) &= ~(LBK); |
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166 | M68302imp_port_data (1) |= (FDE); |
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167 | |
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168 | M68en302imp_ecntrl=0x0001; |
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169 | /* |
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170 | * Set dma configuration status register EDMA |
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171 | */ |
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172 | i = (sc->txBdCount == 16) ? EDMA_BDSIZE_16T_112R : |
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173 | (sc->txBdCount == 32) ? EDMA_BDSIZE_32T_96R : |
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174 | (sc->txBdCount == 64) ? EDMA_BDSIZE_64T_64R : |
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175 | EDMA_BDSIZE_8T_120R; |
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176 | |
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177 | M68en302imp_edma = EDMA_BLIM_8ACCESS | EDMA_WMRK_16FIFO | EDMA_BIT_TSRLY | (ushort)i; |
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178 | |
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179 | /* |
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180 | * Set maximum receive buffer length |
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181 | */ |
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182 | |
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183 | M68en302imp_emrblr = RBUF_SIZE; /* 1520 */ |
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184 | |
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185 | /* |
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186 | * Set interrupt vector |
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187 | */ |
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188 | M68en302imp_intr_vect = M302_ETHER_IVECTOR; |
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189 | |
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190 | M68en302imp_intr_mask=0x0; |
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191 | |
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192 | /* |
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193 | * Set ethernet Configuration |
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194 | */ |
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195 | M68en302imp_ecnfig=0x0000; |
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196 | |
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197 | /* |
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198 | * Set ETHER_TEST |
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199 | */ |
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200 | M68en302imp_ether_test=0x0000; |
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201 | |
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202 | /* |
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203 | * Set AR control Register |
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204 | * Ignore/accept broadcast packets as specified |
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205 | */ |
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206 | M68en302imp_ar_cntrl = ((sc->acceptBroadcast) ? 0 : AR_CNTRL_BIT_NO_BROADCAST) ; |
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207 | |
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208 | /* |
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209 | * Allocate mbuf pointers |
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210 | */ |
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211 | sc->rxMbuf = malloc (sc->rxBdCount * sizeof *sc->rxMbuf, M_MBUF, M_NOWAIT); |
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212 | sc->txMbuf = malloc (sc->txBdCount * sizeof *sc->txMbuf, M_MBUF, M_NOWAIT); |
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213 | if (!sc->rxMbuf || !sc->txMbuf) |
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214 | rtems_panic ("No memory for mbuf pointers"); |
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215 | |
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216 | /* |
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217 | * Set our physical address |
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218 | */ |
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219 | hwaddr = sc->arpcom.ac_enaddr; |
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220 | |
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221 | cam=(ushort *)(M68en302imp_cet); |
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222 | for (i=0;i<64;i++){ |
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223 | cam[(4*i)]=0x00ff; |
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224 | cam[(4*i)+1]=0x00ff; |
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225 | cam[(4*i)+2]=0x00ff; |
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226 | } |
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227 | |
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228 | cam[4] = (hwaddr[0] << 8) | hwaddr[1]; |
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229 | cam[5] = (hwaddr[2] << 8) | hwaddr[3]; |
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230 | cam[6] = (hwaddr[4] << 8) | hwaddr[5]; |
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231 | |
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232 | /* |
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233 | * Set receiver and transmitter buffer descriptor bases |
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234 | */ |
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235 | a_bd = M68302imp_a_eth_bd (0); /* point to first BD */ |
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236 | |
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237 | for (i=0;i<128;i++){ |
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238 | |
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239 | M68302_scc_bd_stat_ctrl (a_bd + i) = 0; |
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240 | M68302_scc_bd_data_lgth (a_bd + i) = 0; |
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241 | M68302_scc_bd_p_buffer (a_bd + i) = NULL; |
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242 | } |
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243 | |
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244 | sc->txBdBase = M68302imp_a_eth_bd ( 0 ); /* point to first BD */ |
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245 | sc->rxBdBase = M68302imp_a_eth_bd ( sc->txBdCount); /* point to first RX BD atfer all TX*/ |
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246 | |
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247 | /* |
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248 | * Set up transmit buffer descriptors |
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249 | */ |
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250 | for (i = 0 ; i < sc->txBdCount ; i++) { |
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251 | sc->txMbuf[i] = NULL; |
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252 | } |
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253 | sc->txBdHead = sc->txBdTail = 0; |
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254 | sc->txBdActiveCount = 0; |
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255 | |
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256 | /* |
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257 | * Clear any outstanding events |
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258 | */ |
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259 | M68en302imp_intr_event = 0x07FF; |
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260 | /* |
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261 | * Set up interrupts |
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262 | */ |
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263 | |
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264 | status = rtems_interrupt_catch (m302Enet_interrupt_handler, |
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265 | M302_ETHER_IVECTOR, |
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266 | &old_handler); |
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267 | if (status != RTEMS_SUCCESSFUL) |
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268 | rtems_panic ("Can't attach M302 ether interrupt handler: %s\r\n", |
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269 | rtems_status_text (status)); |
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270 | } |
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271 | |
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272 | /* |
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273 | * Soak up buffer descriptors that have been sent |
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274 | * Note that a buffer descriptor can't be retired as soon as it becomes |
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275 | * ready. The MC68360 Errata (May 96) says that, "If an Ethernet frame is |
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276 | * made up of multiple buffers, the user should not reuse the first buffer |
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277 | * descriptor until the last buffer descriptor of the frame has had its |
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278 | * ready bit cleared by the CPM". |
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279 | */ |
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280 | static void |
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281 | m302Enet_retire_tx_bd (struct scc_softc *sc) |
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282 | { |
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283 | |
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284 | uint16_t status; |
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285 | int i; |
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286 | int nRetired; |
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287 | struct mbuf *m, *n; |
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288 | int retries = 0; |
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289 | int saveStatus = 0; |
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290 | |
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291 | i = sc->txBdTail; |
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292 | nRetired = 0; |
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293 | while ((sc->txBdActiveCount != 0) |
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294 | && (((status = (sc->txBdBase + i)->stat_ctrl) & BUF_STAT_READY) == 0)) { |
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295 | /* |
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296 | * Check for errors which stop the transmitter. |
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297 | */ |
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298 | if (status & (BUF_STAT_LATE_COLLISION | |
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299 | BUF_STAT_RETRY_LIMIT | |
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300 | BUF_STAT_UNDERRUN)) { |
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301 | int j; |
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302 | |
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303 | if (status & BUF_STAT_LATE_COLLISION) |
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304 | sc->txLateCollision++; |
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305 | if (status & BUF_STAT_RETRY_LIMIT) |
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306 | sc->txRetryLimit++; |
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307 | if (status & BUF_STAT_UNDERRUN) |
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308 | sc->txUnderrun++; |
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309 | |
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310 | /* |
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311 | * Reenable buffer descriptors |
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312 | */ |
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313 | j = sc->txBdTail; |
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314 | for (;;) { |
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315 | status = (sc->txBdBase + j)->stat_ctrl; |
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316 | if (status & BUF_STAT_READY) |
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317 | break; |
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318 | (sc->txBdBase + j)->stat_ctrl = BUF_STAT_READY | |
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319 | (status & ( BUF_STAT_WRAP | |
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320 | BUF_STAT_INTERRUPT | |
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321 | BUF_STAT_LAST | |
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322 | BUF_STAT_TX_CRC)); |
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323 | if (status & BUF_STAT_LAST) |
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324 | break; |
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325 | if (++j == sc->txBdCount) |
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326 | j = 0; |
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327 | } |
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328 | |
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329 | /* |
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330 | * Move transmitter back to the first |
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331 | * buffer descriptor in the frame. |
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332 | */ |
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333 | /* m360.scc1p._tbptr = m360.scc1p.tbase + |
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334 | sc->txBdTail * sizeof (m360BufferDescriptor_t); |
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335 | */ |
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336 | /* |
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337 | * Restart the transmitter |
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338 | */ |
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339 | /* M360ExecuteRISC (M360_CR_OP_RESTART_TX | M360_CR_CHAN_SCC1);*/ |
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340 | continue; |
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341 | } |
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342 | saveStatus |= status; |
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343 | retries += (status >> 2) & 0xF; |
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344 | nRetired++; |
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345 | if (status & BUF_STAT_LAST) { |
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346 | /* |
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347 | * A full frame has been transmitted. |
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348 | * Free all the associated buffer descriptors. |
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349 | */ |
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350 | if (saveStatus & BUF_STAT_DEFER) |
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351 | sc->txDeferred++; |
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352 | if (saveStatus & BUF_STAT_HEARTBIT) |
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353 | sc->txHeartbeat++; |
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354 | if (saveStatus & BUF_STAT_CARRIER_LOST) |
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355 | sc->txLostCarrier++; |
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356 | saveStatus = 0; |
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357 | sc->txRetry += retries; |
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358 | retries = 0; |
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359 | sc->txBdActiveCount -= nRetired; |
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360 | while (nRetired) { |
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361 | nRetired--; |
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362 | m = sc->txMbuf[sc->txBdTail]; |
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363 | MFREE (m, n); |
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364 | if (++sc->txBdTail == sc->txBdCount) |
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365 | sc->txBdTail = 0; |
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366 | } |
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367 | } |
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368 | if (++i == sc->txBdCount) |
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369 | i = 0; |
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370 | } |
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371 | |
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372 | } |
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373 | |
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374 | /* |
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375 | * SCC reader task |
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376 | */ |
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377 | static void |
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378 | scc_rxDaemon (void *arg) |
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379 | { |
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380 | |
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381 | struct scc_softc *sc = (struct scc_softc *)arg; |
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382 | struct ifnet *ifp = &sc->arpcom.ac_if; |
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383 | struct mbuf *m; |
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384 | uint16_t status; |
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385 | volatile struct m68302_scc_bd *rxBd; |
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386 | int rxBdIndex; |
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387 | |
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388 | /* |
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389 | * Allocate space for incoming packets and start reception |
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390 | */ |
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391 | for (rxBdIndex = 0 ; ;) { |
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392 | rxBd = sc->rxBdBase + rxBdIndex; |
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393 | MGETHDR (m, M_WAIT, MT_DATA); |
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394 | MCLGET (m, M_WAIT); |
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395 | m->m_pkthdr.rcvif = ifp; |
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396 | sc->rxMbuf[rxBdIndex] = m; |
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397 | rxBd->p_buffer = mtod (m, void *); |
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398 | |
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399 | if (++rxBdIndex == sc->rxBdCount) { |
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400 | rxBd->stat_ctrl = BUF_STAT_EMPTY | BUF_STAT_INTERRUPT | BUF_STAT_WRAP; |
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401 | break; |
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402 | } |
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403 | rxBd->stat_ctrl = BUF_STAT_EMPTY | BUF_STAT_INTERRUPT; |
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404 | } |
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405 | |
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406 | /* |
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407 | * Input packet handling loop |
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408 | */ |
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409 | rxBdIndex = 0; |
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410 | for (;;) { |
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411 | rxBd = sc->rxBdBase + rxBdIndex; |
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412 | |
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413 | /* |
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414 | * Wait for packet if there's not one ready |
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415 | */ |
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416 | if ((status = rxBd->stat_ctrl) & BUF_STAT_EMPTY) { |
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417 | /* |
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418 | * Clear old events |
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419 | */ |
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420 | M68en302imp_intr_event = INTR_EVENT_BIT_RFINT; |
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421 | |
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422 | /* |
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423 | * Wait for packet |
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424 | * Note that the buffer descriptor is checked |
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425 | * *before* the event wait -- this catches the |
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426 | * possibility that a packet arrived between the |
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427 | * `if' above, and the clearing of the event register. |
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428 | */ |
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429 | while ((status = rxBd->stat_ctrl) & BUF_STAT_EMPTY) { |
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430 | rtems_interrupt_level level; |
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431 | rtems_event_set events; |
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432 | |
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433 | /* |
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434 | * Unmask RXF (Full frame received) event |
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435 | */ |
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436 | rtems_interrupt_disable (level); |
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437 | M68en302imp_intr_mask |= INTR_MASK_BIT_RFIEN; |
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438 | |
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439 | rtems_interrupt_enable (level); |
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440 | rtems_bsdnet_event_receive (INTERRUPT_EVENT, |
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441 | RTEMS_WAIT|RTEMS_EVENT_ANY, |
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442 | RTEMS_NO_TIMEOUT, |
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443 | &events); |
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444 | } |
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445 | } |
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446 | |
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447 | /* |
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448 | * Check that packet is valid |
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449 | */ |
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450 | if ((status & (BUF_STAT_LAST | |
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451 | BUF_STAT_FIRST_IN_FRAME | |
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452 | BUF_STAT_LONG | |
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453 | BUF_STAT_NONALIGNED | |
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454 | BUF_STAT_SHORT | |
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455 | BUF_STAT_CRC_ERROR | |
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456 | BUF_STAT_OVERRUN | |
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457 | BUF_STAT_COLLISION)) == |
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458 | (BUF_STAT_LAST | |
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459 | BUF_STAT_FIRST_IN_FRAME)) { |
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460 | /* |
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461 | * Pass the packet up the chain. |
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462 | * FIXME: Packet filtering hook could be done here. |
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463 | */ |
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464 | struct ether_header *eh; |
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465 | |
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466 | m = sc->rxMbuf[rxBdIndex]; |
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467 | m->m_len = m->m_pkthdr.len = rxBd->data_lgth - |
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468 | sizeof(uint32_t) - |
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469 | sizeof(struct ether_header); |
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470 | eh = mtod (m, struct ether_header *); |
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471 | m->m_data += sizeof(struct ether_header); |
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472 | |
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473 | ether_input (ifp, eh, m); |
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474 | |
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475 | /* |
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476 | * Allocate a new mbuf |
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477 | */ |
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478 | MGETHDR (m, M_WAIT, MT_DATA); |
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479 | MCLGET (m, M_WAIT); |
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480 | m->m_pkthdr.rcvif = ifp; |
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481 | sc->rxMbuf[rxBdIndex] = m; |
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482 | rxBd->p_buffer = mtod (m, void *); |
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483 | } |
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484 | else { |
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485 | /* |
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486 | * Something went wrong with the reception |
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487 | */ |
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488 | if (!(status & BUF_STAT_LAST)) |
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489 | sc->rxNotLast++; |
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490 | if (!(status & BUF_STAT_FIRST_IN_FRAME)) |
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491 | sc->rxNotFirst++; |
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492 | if (status & BUF_STAT_LONG) |
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493 | sc->rxGiant++; |
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494 | if (status & BUF_STAT_NONALIGNED) |
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495 | sc->rxNonOctet++; |
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496 | if (status & BUF_STAT_SHORT) |
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497 | sc->rxRunt++; |
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498 | if (status & BUF_STAT_CRC_ERROR) |
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499 | sc->rxBadCRC++; |
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500 | if (status & BUF_STAT_OVERRUN) |
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501 | sc->rxOverrun++; |
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502 | if (status & BUF_STAT_COLLISION) |
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503 | sc->rxCollision++; |
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504 | } |
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505 | |
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506 | /* |
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507 | * Reenable the buffer descriptor |
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508 | */ |
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509 | rxBd->stat_ctrl = (status & (BUF_STAT_WRAP | BUF_STAT_INTERRUPT)) | BUF_STAT_EMPTY; |
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510 | |
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511 | /* |
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512 | * Move to next buffer descriptor |
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513 | */ |
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514 | if (++rxBdIndex == sc->rxBdCount) |
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515 | rxBdIndex = 0; |
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516 | } |
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517 | |
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518 | } |
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519 | |
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520 | static void |
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521 | sendpacket (struct ifnet *ifp, struct mbuf *m) |
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522 | { |
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523 | |
---|
524 | struct scc_softc *sc = ifp->if_softc; |
---|
525 | volatile struct m68302_scc_bd *firstTxBd, *txBd; |
---|
526 | struct mbuf *l = NULL; |
---|
527 | uint16_t status; |
---|
528 | int nAdded; |
---|
529 | |
---|
530 | /* |
---|
531 | * Free up buffer descriptors |
---|
532 | */ |
---|
533 | m302Enet_retire_tx_bd (sc); |
---|
534 | /* |
---|
535 | * Set up the transmit buffer descriptors. |
---|
536 | * No need to pad out short packets since the |
---|
537 | * hardware takes care of that automatically. |
---|
538 | * No need to copy the packet to a contiguous buffer |
---|
539 | * since the hardware is capable of scatter/gather DMA. |
---|
540 | */ |
---|
541 | status = 0; |
---|
542 | nAdded = 0; |
---|
543 | txBd = firstTxBd = sc->txBdBase + sc->txBdHead; |
---|
544 | while (m) { |
---|
545 | /* |
---|
546 | * There are more mbufs in the packet than there |
---|
547 | * are transmit buffer descriptors. |
---|
548 | * Coalesce into a single buffer. |
---|
549 | */ |
---|
550 | if (nAdded == sc->txBdCount) { |
---|
551 | struct mbuf *nm; |
---|
552 | int j; |
---|
553 | char *dest; |
---|
554 | |
---|
555 | /* |
---|
556 | * Get the pointer to the first mbuf of the packet |
---|
557 | */ |
---|
558 | if (sc->txBdTail != sc->txBdHead) |
---|
559 | rtems_panic ("sendpacket coalesce"); |
---|
560 | m = sc->txMbuf[sc->txBdTail]; |
---|
561 | |
---|
562 | /* |
---|
563 | * Rescind the buffer descriptor READY bits |
---|
564 | */ |
---|
565 | for (j = 0 ; j < sc->txBdCount ; j++) |
---|
566 | (sc->txBdBase + j)->stat_ctrl = 0; |
---|
567 | |
---|
568 | /* |
---|
569 | * Allocate an mbuf cluster |
---|
570 | * Toss the packet if allocation fails |
---|
571 | */ |
---|
572 | MGETHDR (nm, M_DONTWAIT, MT_DATA); |
---|
573 | if (nm == NULL) { |
---|
574 | sc->txCoalesceFailed++; |
---|
575 | m_freem (m); |
---|
576 | |
---|
577 | return; |
---|
578 | } |
---|
579 | MCLGET (nm, M_DONTWAIT); |
---|
580 | if (nm->m_ext.ext_buf == NULL) { |
---|
581 | sc->txCoalesceFailed++; |
---|
582 | m_freem (m); |
---|
583 | m_free (nm); |
---|
584 | |
---|
585 | return; |
---|
586 | } |
---|
587 | nm->m_pkthdr = m->m_pkthdr; |
---|
588 | nm->m_len = nm->m_pkthdr.len; |
---|
589 | |
---|
590 | /* |
---|
591 | * Copy data from packet chain to mbuf cluster |
---|
592 | */ |
---|
593 | sc->txCoalesced++; |
---|
594 | dest = nm->m_ext.ext_buf; |
---|
595 | while (m) { |
---|
596 | struct mbuf *n; |
---|
597 | |
---|
598 | if (m->m_len) { |
---|
599 | memcpy (dest, mtod(m, caddr_t), m->m_len); |
---|
600 | dest += m->m_len; |
---|
601 | } |
---|
602 | MFREE (m, n); |
---|
603 | m = n; |
---|
604 | } |
---|
605 | |
---|
606 | /* |
---|
607 | * Redo the send with the new mbuf cluster |
---|
608 | */ |
---|
609 | m = nm; |
---|
610 | nAdded = 0; |
---|
611 | status = 0; |
---|
612 | |
---|
613 | continue; |
---|
614 | } |
---|
615 | |
---|
616 | /* |
---|
617 | * Wait for buffer descriptor to become available. |
---|
618 | */ |
---|
619 | if ((sc->txBdActiveCount + nAdded) == sc->txBdCount) { |
---|
620 | /* |
---|
621 | * Clear old events |
---|
622 | */ |
---|
623 | M68en302imp_intr_event = INTR_EVENT_BIT_TFINT | INTR_EVENT_BIT_TXB; |
---|
624 | |
---|
625 | /* |
---|
626 | * Wait for buffer descriptor to become available. |
---|
627 | * Note that the buffer descriptors are checked |
---|
628 | * *before* entering the wait loop -- this catches |
---|
629 | * the possibility that a buffer descriptor became |
---|
630 | * available between the `if' above, and the clearing |
---|
631 | * of the event register. |
---|
632 | * This is to catch the case where the transmitter |
---|
633 | * stops in the middle of a frame -- and only the |
---|
634 | * last buffer descriptor in a frame can generate |
---|
635 | * an interrupt. |
---|
636 | */ |
---|
637 | m302Enet_retire_tx_bd (sc); |
---|
638 | while ((sc->txBdActiveCount + nAdded) == sc->txBdCount) { |
---|
639 | rtems_interrupt_level level; |
---|
640 | rtems_event_set events; |
---|
641 | |
---|
642 | /* |
---|
643 | * Unmask TXB (buffer transmitted) and |
---|
644 | * TXE (transmitter error) events. |
---|
645 | */ |
---|
646 | rtems_interrupt_disable (level); |
---|
647 | M68en302imp_intr_mask |= INTR_MASK_BIT_TFIEN | INTR_MASK_BIT_TXIEN; |
---|
648 | rtems_interrupt_enable (level); |
---|
649 | |
---|
650 | rtems_bsdnet_event_receive (INTERRUPT_EVENT, |
---|
651 | RTEMS_WAIT|RTEMS_EVENT_ANY, |
---|
652 | RTEMS_NO_TIMEOUT, |
---|
653 | &events); |
---|
654 | m302Enet_retire_tx_bd (sc); |
---|
655 | } |
---|
656 | } |
---|
657 | |
---|
658 | /* |
---|
659 | * The IP fragmentation routine in ip_output |
---|
660 | * can produce packet fragments with zero length. |
---|
661 | */ |
---|
662 | if (m->m_len) { |
---|
663 | /* |
---|
664 | * Fill in the buffer descriptor. |
---|
665 | * Don't set the READY flag in the first buffer |
---|
666 | * descriptor till the whole packet has been readied. |
---|
667 | */ |
---|
668 | txBd = sc->txBdBase + sc->txBdHead; |
---|
669 | txBd->p_buffer = mtod (m, void *); |
---|
670 | txBd->data_lgth = m->m_len; |
---|
671 | |
---|
672 | sc->txMbuf[sc->txBdHead] = m; |
---|
673 | status = nAdded ? BUF_STAT_READY : 0; |
---|
674 | if (++sc->txBdHead == sc->txBdCount) { |
---|
675 | status |= BUF_STAT_WRAP; |
---|
676 | sc->txBdHead = 0; |
---|
677 | } |
---|
678 | txBd->stat_ctrl = status; |
---|
679 | l = m; |
---|
680 | m = m->m_next; |
---|
681 | nAdded++; |
---|
682 | |
---|
683 | } |
---|
684 | else { |
---|
685 | /* |
---|
686 | * Just toss empty mbufs |
---|
687 | */ |
---|
688 | struct mbuf *n; |
---|
689 | MFREE (m, n); |
---|
690 | m = n; |
---|
691 | if (l != NULL) |
---|
692 | l->m_next = m; |
---|
693 | |
---|
694 | } |
---|
695 | } |
---|
696 | if (nAdded) { |
---|
697 | /* |
---|
698 | * Send the packet |
---|
699 | */ |
---|
700 | txBd->stat_ctrl = status | BUF_STAT_LAST | BUF_STAT_TX_CRC | BUF_STAT_INTERRUPT; |
---|
701 | firstTxBd->stat_ctrl |= BUF_STAT_READY; |
---|
702 | sc->txBdActiveCount += nAdded; |
---|
703 | |
---|
704 | } |
---|
705 | |
---|
706 | } |
---|
707 | |
---|
708 | /* |
---|
709 | * Driver transmit daemon |
---|
710 | */ |
---|
711 | void |
---|
712 | scc_txDaemon (void *arg) |
---|
713 | { |
---|
714 | |
---|
715 | struct scc_softc *sc = (struct scc_softc *)arg; |
---|
716 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
717 | struct mbuf *m; |
---|
718 | rtems_event_set events; |
---|
719 | |
---|
720 | for (;;) { |
---|
721 | /* |
---|
722 | * Wait for packet |
---|
723 | */ |
---|
724 | rtems_bsdnet_event_receive (START_TRANSMIT_EVENT, RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT, &events); |
---|
725 | |
---|
726 | /* |
---|
727 | * Send packets till queue is empty |
---|
728 | */ |
---|
729 | for (;;) { |
---|
730 | /* |
---|
731 | * Get the next mbuf chain to transmit. |
---|
732 | */ |
---|
733 | IF_DEQUEUE(&ifp->if_snd, m); |
---|
734 | if (!m) |
---|
735 | break; |
---|
736 | sendpacket (ifp, m); |
---|
737 | } |
---|
738 | ifp->if_flags &= ~IFF_OACTIVE; |
---|
739 | } |
---|
740 | |
---|
741 | } |
---|
742 | |
---|
743 | /* |
---|
744 | * Send packet (caller provides header). |
---|
745 | */ |
---|
746 | static void |
---|
747 | scc_start (struct ifnet *ifp) |
---|
748 | { |
---|
749 | struct scc_softc *sc = ifp->if_softc; |
---|
750 | |
---|
751 | rtems_event_send (sc->txDaemonTid, START_TRANSMIT_EVENT); |
---|
752 | ifp->if_flags |= IFF_OACTIVE; |
---|
753 | } |
---|
754 | |
---|
755 | /* |
---|
756 | * Initialize and start the device |
---|
757 | */ |
---|
758 | static void |
---|
759 | scc_init (void *arg) |
---|
760 | { |
---|
761 | struct scc_softc *sc = arg; |
---|
762 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
763 | |
---|
764 | if (sc->txDaemonTid == 0) { |
---|
765 | |
---|
766 | /* |
---|
767 | * Set up SCC hardware |
---|
768 | */ |
---|
769 | m302Enet_initialize_hardware (sc); |
---|
770 | |
---|
771 | sc->txDaemonTid = rtems_bsdnet_newproc ("SCtx", 4096, scc_txDaemon, sc); |
---|
772 | sc->rxDaemonTid = rtems_bsdnet_newproc ("SCrx", 4096, scc_rxDaemon, sc); |
---|
773 | |
---|
774 | } |
---|
775 | |
---|
776 | /* |
---|
777 | * Set flags appropriately |
---|
778 | */ |
---|
779 | /* if (ifp->if_flags & IFF_PROMISC) |
---|
780 | m360.scc1.psmr |= 0x200; |
---|
781 | else |
---|
782 | m360.scc1.psmr &= ~0x200; |
---|
783 | */ |
---|
784 | /* |
---|
785 | * Tell the world that we're running. |
---|
786 | */ |
---|
787 | ifp->if_flags |= IFF_RUNNING; |
---|
788 | |
---|
789 | /* |
---|
790 | * Enable receiver and transmitter |
---|
791 | */ |
---|
792 | M68en302imp_ecntrl = ECNTRL_BIT_RESET | ECNTRL_BIT_ETHER_EN; |
---|
793 | |
---|
794 | } |
---|
795 | |
---|
796 | /* |
---|
797 | * Stop the device |
---|
798 | */ |
---|
799 | static void |
---|
800 | scc_stop (struct scc_softc *sc) |
---|
801 | { |
---|
802 | |
---|
803 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
804 | |
---|
805 | ifp->if_flags &= ~IFF_RUNNING; |
---|
806 | |
---|
807 | /* |
---|
808 | * Shut down receiver and transmitter |
---|
809 | */ |
---|
810 | M68en302imp_ecntrl &= ~(ECNTRL_BIT_RESET | ECNTRL_BIT_ETHER_EN); |
---|
811 | |
---|
812 | } |
---|
813 | |
---|
814 | /* |
---|
815 | * Show interface statistics |
---|
816 | */ |
---|
817 | static void |
---|
818 | scc_stats (struct scc_softc *sc) |
---|
819 | { |
---|
820 | printf (" Rx Interrupts:%-8lu", sc->rxInterrupts); |
---|
821 | printf (" Not First:%-8lu", sc->rxNotFirst); |
---|
822 | printf (" Not Last:%-8lu\r\n", sc->rxNotLast); |
---|
823 | printf (" Giant:%-8lu", sc->rxGiant); |
---|
824 | printf (" Runt:%-8lu", sc->rxRunt); |
---|
825 | printf (" Non-octet:%-8lu\r\n", sc->rxNonOctet); |
---|
826 | printf (" Bad CRC:%-8lu", sc->rxBadCRC); |
---|
827 | printf (" Overrun:%-8lu", sc->rxOverrun); |
---|
828 | printf (" Collision:%-8lu\r\n", sc->rxCollision); |
---|
829 | /* printf (" Discarded:%-8lu\r\n", (unsigned long)m360.scc1p.un.ethernet.disfc); |
---|
830 | */ |
---|
831 | printf (" Tx Interrupts:%-8lu", sc->txInterrupts); |
---|
832 | printf (" Deferred:%-8lu", sc->txDeferred); |
---|
833 | printf (" Missed Hearbeat:%-8lu\r\n", sc->txHeartbeat); |
---|
834 | printf (" No Carrier:%-8lu", sc->txLostCarrier); |
---|
835 | printf ("Retransmit Limit:%-8lu", sc->txRetryLimit); |
---|
836 | printf (" Late Collision:%-8lu\r\n", sc->txLateCollision); |
---|
837 | printf (" Underrun:%-8lu", sc->txUnderrun); |
---|
838 | printf (" Raw output wait:%-8lu", sc->txRawWait); |
---|
839 | printf (" Coalesced:%-8lu\r\n", sc->txCoalesced); |
---|
840 | printf (" Coalesce failed:%-8lu", sc->txCoalesceFailed); |
---|
841 | printf (" Retries:%-8lu\r\n", sc->txRetry); |
---|
842 | } |
---|
843 | |
---|
844 | /* |
---|
845 | * Driver ioctl handler |
---|
846 | */ |
---|
847 | static int |
---|
848 | scc_ioctl (struct ifnet *ifp, ioctl_command_t command, caddr_t data) |
---|
849 | { |
---|
850 | |
---|
851 | struct scc_softc *sc = ifp->if_softc; |
---|
852 | int error = 0; |
---|
853 | |
---|
854 | switch (command) { |
---|
855 | case SIOCGIFADDR: |
---|
856 | case SIOCSIFADDR: |
---|
857 | ether_ioctl (ifp, command, data); |
---|
858 | break; |
---|
859 | |
---|
860 | case SIOCSIFFLAGS: |
---|
861 | switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { |
---|
862 | case IFF_RUNNING: |
---|
863 | scc_stop (sc); |
---|
864 | break; |
---|
865 | |
---|
866 | case IFF_UP: |
---|
867 | scc_init (sc); |
---|
868 | break; |
---|
869 | |
---|
870 | case IFF_UP | IFF_RUNNING: |
---|
871 | scc_stop (sc); |
---|
872 | scc_init (sc); |
---|
873 | break; |
---|
874 | |
---|
875 | default: |
---|
876 | break; |
---|
877 | } |
---|
878 | break; |
---|
879 | |
---|
880 | case SIO_RTEMS_SHOW_STATS: |
---|
881 | scc_stats (sc); |
---|
882 | break; |
---|
883 | |
---|
884 | /* |
---|
885 | * FIXME: All sorts of multicast commands need to be added here! |
---|
886 | */ |
---|
887 | default: |
---|
888 | error = EINVAL; |
---|
889 | break; |
---|
890 | } |
---|
891 | return error; |
---|
892 | |
---|
893 | } |
---|
894 | |
---|
895 | /* |
---|
896 | * Attach an SCC driver to the system |
---|
897 | */ |
---|
898 | int |
---|
899 | rtems_ether1_driver_attach (struct rtems_bsdnet_ifconfig *config) |
---|
900 | { |
---|
901 | struct scc_softc *sc; |
---|
902 | struct ifnet *ifp; |
---|
903 | int mtu; |
---|
904 | int unitNumber; |
---|
905 | char *unitName; |
---|
906 | |
---|
907 | a_m68302_imp = (struct m68302_imp *)0x700000L; |
---|
908 | /* |
---|
909 | * Parse driver name |
---|
910 | */ |
---|
911 | if ((unitNumber = rtems_bsdnet_parse_driver_name (config, &unitName)) < 0) |
---|
912 | return 0; |
---|
913 | |
---|
914 | /* |
---|
915 | * Is driver free? |
---|
916 | */ |
---|
917 | if ((unitNumber <= 0) || (unitNumber > NSCCDRIVER)) { |
---|
918 | printf ("Bad SCC unit number.\r\n"); |
---|
919 | return 0; |
---|
920 | } |
---|
921 | sc = &scc_softc[unitNumber - 1]; |
---|
922 | ifp = &sc->arpcom.ac_if; |
---|
923 | if (ifp->if_softc != NULL) { |
---|
924 | printf ("Driver already in use.\r\n"); |
---|
925 | return 0; |
---|
926 | } |
---|
927 | |
---|
928 | /* |
---|
929 | * Process options |
---|
930 | */ |
---|
931 | if (config->hardware_address) { |
---|
932 | memcpy (sc->arpcom.ac_enaddr, config->hardware_address, ETHER_ADDR_LEN); |
---|
933 | } |
---|
934 | |
---|
935 | if (config->mtu) |
---|
936 | mtu = config->mtu; |
---|
937 | else |
---|
938 | mtu = ETHERMTU; |
---|
939 | if (config->rbuf_count) |
---|
940 | sc->rxBdCount = config->rbuf_count; |
---|
941 | else |
---|
942 | sc->rxBdCount = RX_BUF_COUNT; |
---|
943 | if (config->xbuf_count) |
---|
944 | sc->txBdCount = config->xbuf_count; |
---|
945 | else |
---|
946 | sc->txBdCount = TX_BUF_COUNT; |
---|
947 | sc->acceptBroadcast = !config->ignore_broadcast; |
---|
948 | |
---|
949 | /* |
---|
950 | * Set up network interface values |
---|
951 | */ |
---|
952 | ifp->if_softc = sc; |
---|
953 | ifp->if_unit = unitNumber; |
---|
954 | ifp->if_name = unitName; |
---|
955 | ifp->if_mtu = mtu; |
---|
956 | ifp->if_init = scc_init; |
---|
957 | ifp->if_ioctl = scc_ioctl; |
---|
958 | ifp->if_start = scc_start; |
---|
959 | ifp->if_output = ether_output; |
---|
960 | ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; |
---|
961 | if (ifp->if_snd.ifq_maxlen == 0) |
---|
962 | ifp->if_snd.ifq_maxlen = ifqmaxlen; |
---|
963 | |
---|
964 | /* |
---|
965 | * Attach the interface |
---|
966 | */ |
---|
967 | if_attach (ifp); |
---|
968 | ether_ifattach (ifp); |
---|
969 | return 1; |
---|
970 | }; |
---|