1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | /*######################################################### |
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6 | # |
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7 | # This code is a modified version of what you will find at the |
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8 | # end of the IDP User's manual. The original code is copyrighted |
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9 | # by Motorola and Motorola Semiconductor Products as well as |
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10 | # Motorola Software products group. |
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11 | # |
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12 | # Modifications to the original IDP code by Doug McBride, Colorado |
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13 | # Space Grant College. Modifications include a means of accessing |
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14 | # port B of the duart as well as port A as well as modifications for |
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15 | # buffering and RTEMS support. Modifications are provided |
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16 | # as is and may not be correct. |
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17 | # |
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18 | # Rob Savoye provided the format for the mc68681 header file |
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19 | # |
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20 | # Joel Sherrill provided inspiration for recoding my original assembly |
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21 | # for this file into C (a good idea) |
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22 | # |
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23 | ##########################################################*/ |
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24 | |
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25 | #include <bsp.h> |
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26 | #include <ringbuf.h> |
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27 | |
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28 | rtems_isr C_Receive_ISR(rtems_vector_number vector); |
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29 | extern Ring_buffer_t Buffer[]; |
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30 | |
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31 | extern unsigned char inbuf[]; |
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32 | extern unsigned char inbuf_portb[]; |
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33 | extern unsigned tail; |
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34 | extern unsigned tail_portb; |
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35 | unsigned char Pit_initialized = 0; |
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36 | |
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37 | /*##################################################################### |
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38 | # The volatile routine to initialize the duart -- port a and port b |
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39 | ######################################################################*/ |
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40 | volatile void init_pit() |
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41 | { |
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42 | /* |
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43 | * ports A & B while configuring PIT by: |
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44 | * |
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45 | * + disable Interrupt Mask Register |
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46 | * + disable port A transmitter |
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47 | * + disable port A receiver |
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48 | * + disable port B transmitter |
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49 | * + disable port B receiver |
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50 | */ |
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51 | |
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52 | MC68681_WRITE(DUART_ADDR, MC68681_INTERRUPT_MASK_REG, 0x00); |
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53 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_A ,MC68681_MODE_REG_DISABLE_TX); |
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54 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_A, MC68681_MODE_REG_DISABLE_RX); |
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55 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_B, MC68681_MODE_REG_DISABLE_TX); |
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56 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_B, MC68681_MODE_REG_DISABLE_RX); |
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57 | |
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58 | /* |
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59 | * install ISR for ports A and B |
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60 | */ |
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61 | set_vector(C_Receive_ISR, (VECT+H3VECT), 1); |
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62 | |
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63 | /* |
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64 | * initialize pit |
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65 | * |
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66 | * set mode to 0 -- disable all ports |
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67 | * set up pirq and piack |
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68 | * all pins on port b are input |
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69 | * submode 1x, h3 interrupt enabled |
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70 | * setup pivr |
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71 | * turn on all ports |
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72 | */ |
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73 | MC68230_WRITE(PGCR, 0x00); |
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74 | MC68230_WRITE(PSRR, 0x18); |
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75 | MC68230_WRITE(PBDDR, 0x00); |
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76 | MC68230_WRITE(PBCR, 0x82); |
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77 | MC68230_WRITE(PIVR, VECT); |
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78 | MC68230_WRITE(PGCR, 0x20); |
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79 | |
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80 | /* |
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81 | * For some reason, the reset of receiver/transmitter only works for |
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82 | * the first time around -- it garbles the output otherwise |
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83 | * (e.g., sp21) |
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84 | */ |
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85 | if (!Pit_initialized) |
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86 | { |
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87 | /* |
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88 | * initialize the duart registers on port b |
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89 | * WARNING:OPTIMIZER MAY ONLY EXECUTE THIRD STATEMENT IF NOT VOLATILE |
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90 | * |
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91 | * reset tx, channel b |
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92 | * reset rx, channel b |
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93 | * reset mr pointer, ch |
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94 | */ |
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95 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_B, MC68681_MODE_REG_RESET_TX); |
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96 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_B, MC68681_MODE_REG_RESET_RX); |
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97 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_B, MC68681_MODE_REG_RESET_MR_PTR); |
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98 | |
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99 | /* |
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100 | * initialize the duart registers on port a |
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101 | * WARNING:OPTIMIZER MAY ONLY EXECUTE THIRD STATEMENT IF NOT VOLATILE |
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102 | * |
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103 | * reset tx, channel a |
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104 | * reset rx, channel a |
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105 | * reset mr pointer, ch |
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106 | */ |
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107 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_A, MC68681_MODE_REG_RESET_TX); |
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108 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_A, MC68681_MODE_REG_RESET_RX); |
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109 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_A, MC68681_MODE_REG_RESET_MR_PTR); |
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110 | |
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111 | Pit_initialized = 1; |
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112 | } |
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113 | |
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114 | /* |
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115 | * Init the general registers of the duart |
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116 | * |
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117 | * init ivr |
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118 | * init imr |
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119 | * init acr |
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120 | * init ctur |
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121 | * init ctlr |
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122 | * init opcr |
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123 | * init cts |
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124 | */ |
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125 | MC68681_WRITE(DUART_ADDR, MC68681_INTERRUPT_VECTOR_REG, |
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126 | MC68681_INTERRUPT_VECTOR_INIT); |
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127 | MC68681_WRITE(DUART_ADDR, MC68681_INTERRUPT_MASK_REG, |
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128 | MC68681_IR_RX_READY_A | MC68681_IR_RX_READY_B); |
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129 | MC68681_WRITE(DUART_ADDR, MC68681_AUX_CTRL_REG, MC68681_CLEAR); |
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130 | MC68681_WRITE(DUART_ADDR, MC68681_COUNTER_TIMER_UPPER_REG, 0x00); |
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131 | MC68681_WRITE(DUART_ADDR, MC68681_COUNTER_TIMER_LOWER_REG, 0x02); |
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132 | MC68681_WRITE(DUART_ADDR, MC68681_OUTPUT_PORT_CONFIG_REG, MC68681_CLEAR); |
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133 | MC68681_WRITE(DUART_ADDR, MC68681_OUTPUT_PORT_SET_REG, 0x01); |
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134 | |
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135 | /* |
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136 | * init the actual serial port for port a |
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137 | * |
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138 | * Set Baud Rate to 9600 |
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139 | * Set Stop bit length of 1 |
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140 | * enable Transmit and receive |
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141 | */ |
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142 | MC68681_WRITE(DUART_ADDR, MC68681_CLOCK_SELECT_REG_A, MC68681_BAUD_RATE_MASK_9600); |
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143 | MC68681_WRITE(DUART_ADDR, MC68681_MODE_REG_1A, |
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144 | (MC68681_8BIT_CHARS | MC68681_NO_PARITY)); |
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145 | MC68681_WRITE(DUART_ADDR, MC68681_MODE_REG_2A,MC68681_STOP_BIT_LENGTH_1); |
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146 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_A, |
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147 | (MC68681_MODE_REG_ENABLE_TX | MC68681_MODE_REG_ENABLE_RX)); |
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148 | |
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149 | /* |
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150 | * init the actual serial port for port b |
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151 | * init csrb -- 9600 baud |
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152 | */ |
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153 | MC68681_WRITE(DUART_ADDR, MC68681_CLOCK_SELECT_REG_B, MC68681_BAUD_RATE_MASK_9600); |
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154 | |
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155 | |
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156 | #define EIGHT_BITS_NO_PARITY |
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157 | #ifdef EIGHT_BITS_NO_PARITY |
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158 | /* |
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159 | * Set 8 Bit characters with no parity |
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160 | */ |
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161 | MC68681_WRITE(DUART_ADDR, MC68681_MODE_REG_1B, |
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162 | (MC68681_NO_PARITY | MC68681_8BIT_CHARS) ); |
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163 | #else |
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164 | /* |
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165 | * Set 7 Bit Characters with parity |
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166 | */ |
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167 | MC68681_WRITE(DUART_ADDR, MC68681_MODE_REG_1B, |
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168 | (MC68681_WITH_PARITY | MC68681_7BIT_CHARS) ); |
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169 | #endif |
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170 | |
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171 | |
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172 | /* |
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173 | * Set Stop Bit length to 1 |
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174 | * Disable Recieve and transmit on B |
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175 | */ |
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176 | MC68681_WRITE(DUART_ADDR, MC68681_MODE_REG_2B,MC68681_STOP_BIT_LENGTH_1); |
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177 | MC68681_WRITE(DUART_ADDR, MC68681_COMMAND_REG_B, |
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178 | (MC68681_MODE_REG_ENABLE_TX | MC68681_MODE_REG_ENABLE_RX) ); |
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179 | } |
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180 | |
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181 | /*##################################################################### |
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182 | # interrupt handler for receive of character from duart on ports A & B |
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183 | #####################################################################*/ |
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184 | rtems_isr C_Receive_ISR(rtems_vector_number vector) |
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185 | { |
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186 | volatile unsigned char *_addr; |
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187 | |
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188 | /* |
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189 | * Clear pit interrupt. |
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190 | */ |
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191 | _addr = (unsigned char *) (PIT_ADDR + PITSR); |
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192 | *_addr = 0x04; |
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193 | |
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194 | /* |
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195 | * check port A first for input |
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196 | * extract rcvrdy on port B |
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197 | * set ptr to recieve buffer and read character into ring buffer |
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198 | */ |
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199 | _addr = (unsigned char *) (DUART_ADDR + MC68681_STATUS_REG_A); |
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200 | if (*_addr & MC68681_RX_READY) /* extract rcvrdy on port A */ |
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201 | { |
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202 | _addr = (unsigned char *) (DUART_ADDR + MC68681_RECEIVE_BUFFER_A); |
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203 | Ring_buffer_Add_character( &Buffer[ 0 ], *_addr ); |
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204 | } |
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205 | |
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206 | /* |
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207 | * If not on port A, let's check port B |
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208 | * extract rcvrdy on port B |
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209 | * set ptr to recieve buffer and read character into ring buffer |
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210 | */ |
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211 | else |
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212 | { |
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213 | _addr = (unsigned char *) (DUART_ADDR + MC68681_STATUS_REG_B); |
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214 | if (*_addr & MC68681_RX_READY) /* extract rcvrdy on port B */ |
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215 | { |
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216 | _addr = (unsigned char *) (DUART_ADDR + MC68681_RECEIVE_BUFFER_B); |
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217 | Ring_buffer_Add_character( &Buffer[ 1 ], *_addr ); |
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218 | } |
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219 | |
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220 | /* |
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221 | * if not ready on port A or port B, must be an error |
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222 | * if error, get out so that fifo is undisturbed |
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223 | */ |
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224 | } |
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225 | } |
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226 | |
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227 | /*##################################################################### |
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228 | # This is the routine that actually transmits a character one at a time |
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229 | # This routine transmits on port A of the IDP board |
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230 | #####################################################################*/ |
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231 | void transmit_char(char ch) |
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232 | { |
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233 | volatile unsigned char *_addr; |
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234 | |
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235 | /* |
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236 | * Get SRA (extract txrdy) |
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237 | */ |
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238 | _addr = (unsigned char *) (DUART_ADDR + MC68681_STATUS_REG_A); |
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239 | while (!(*_addr & MC68681_TX_READY)) |
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240 | { |
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241 | } |
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242 | |
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243 | /* |
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244 | * transmit character over port A |
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245 | */ |
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246 | MC68681_WRITE(DUART_ADDR, MC68681_TRANSMIT_BUFFER_A, ch); |
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247 | } |
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248 | |
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249 | |
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250 | /*##################################################################### |
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251 | # This is the routine that actually transmits a character one at a time |
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252 | # This routine transmits on port B of the IDP board |
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253 | #####################################################################*/ |
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254 | void transmit_char_portb(char ch) |
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255 | { |
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256 | volatile unsigned char *_addr; |
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257 | |
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258 | /* |
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259 | * Get SRB (extract txrdy) |
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260 | */ |
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261 | _addr = (unsigned char *) (DUART_ADDR + MC68681_STATUS_REG_B); |
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262 | while (!(*_addr & MC68681_TX_READY)) |
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263 | { |
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264 | } |
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265 | |
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266 | /* |
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267 | * transmit character over port B |
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268 | */ |
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269 | MC68681_WRITE(DUART_ADDR, MC68681_TRANSMIT_BUFFER_B, ch); |
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270 | } |
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