1 | /* |
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2 | * This file contains the MVME162 console IO package. |
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3 | * |
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4 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * All rights assigned to U.S. Government, 1994. |
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7 | * |
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8 | * This material may be reproduced by or for the U.S. Government pursuant |
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9 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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10 | * notice must appear in all copies of this file and its derivatives. |
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11 | * |
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12 | * Modifications of respective RTEMS file: COPYRIGHT (c) 1994. |
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13 | * EISCAT Scientific Association. M.Savitski |
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14 | * |
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15 | * This material is a part of the MVME162 Board Support Package |
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16 | * for the RTEMS executive. Its licensing policies are those of the |
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17 | * RTEMS above. |
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18 | * |
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19 | * $Id$ |
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20 | */ |
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21 | |
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22 | #define M162_INIT |
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23 | |
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24 | #include <rtems.h> |
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25 | #include "console.h" |
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26 | #include "bsp.h" |
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27 | #include "ringbuf.h" |
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28 | |
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29 | Ring_buffer_t Buffer[2]; |
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30 | |
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31 | /* |
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32 | * Interrupt handler for receiver interrupts |
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33 | */ |
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34 | |
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35 | rtems_isr C_Receive_ISR(rtems_vector_number vector) |
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36 | { |
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37 | register int ipend, port; |
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38 | |
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39 | ZWRITE0(1, 0x38); /* reset highest IUS */ |
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40 | |
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41 | ipend = ZREAD(1, 3); /* read int pending from A side */ |
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42 | |
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43 | if (ipend == 0x04) port = 0; /* channel B intr pending */ |
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44 | else if (ipend == 0x20) port = 1; /* channel A intr pending */ |
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45 | else return; |
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46 | |
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47 | Ring_buffer_Add_character(&Buffer[port], ZREADD(port)); |
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48 | |
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49 | if (ZREAD(port, 1) & 0x70) { /* check error stat */ |
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50 | ZWRITE0(port, 0x30); /* reset error */ |
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51 | } |
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52 | } |
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53 | |
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54 | rtems_device_driver console_initialize( |
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55 | rtems_device_major_number major, |
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56 | rtems_device_minor_number minor, |
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57 | void *arg, |
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58 | rtems_id self, |
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59 | rtems_unsigned32 *status |
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60 | ) |
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61 | { |
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62 | int i; |
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63 | |
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64 | /* |
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65 | * Initialise receiver interrupts on both ports |
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66 | */ |
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67 | |
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68 | for (i = 0; i <= 1; i++) { |
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69 | Ring_buffer_Initialize( &Buffer[i] ); |
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70 | ZWRITE(i, 2, SCC_VECTOR); |
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71 | ZWRITE(i, 10, 0); |
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72 | ZWRITE(i, 1, 0x10); /* int on all Rx chars or special condition */ |
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73 | ZWRITE(i, 9, 8); /* master interrupt enable */ |
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74 | } |
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75 | |
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76 | set_vector(C_Receive_ISR, SCC_VECTOR, 1); /* install ISR for ports A and B */ |
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77 | |
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78 | mcchip->vector_base = 0; |
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79 | mcchip->gen_control = 2; /* MIEN */ |
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80 | mcchip->SCC_int_ctl = 0x13; /* SCC IEN, IPL3 */ |
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81 | |
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82 | *status = RTEMS_SUCCESSFUL; |
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83 | } |
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84 | |
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85 | /* |
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86 | * Non-blocking char input |
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87 | */ |
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88 | |
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89 | rtems_boolean char_ready(int port, char *ch) |
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90 | { |
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91 | if ( Ring_buffer_Is_empty( &Buffer[port] ) ) |
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92 | return FALSE; |
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93 | |
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94 | Ring_buffer_Remove_character( &Buffer[port], *ch ); |
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95 | |
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96 | return TRUE; |
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97 | } |
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98 | |
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99 | /* |
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100 | * Block on char input |
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101 | */ |
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102 | |
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103 | char char_wait(int port) |
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104 | { |
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105 | unsigned char tmp_char; |
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106 | |
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107 | while ( !char_ready(port, &tmp_char) ); |
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108 | return tmp_char; |
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109 | } |
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110 | |
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111 | /* |
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112 | * This routine transmits a character out the SCC. It no longer supports |
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113 | * XON/XOFF flow control. |
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114 | */ |
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115 | |
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116 | void char_put(int port, char ch) |
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117 | { |
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118 | while (1) { |
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119 | if (ZREAD0(port) & TX_BUFFER_EMPTY) break; |
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120 | } |
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121 | ZWRITED(port, ch); |
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122 | } |
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123 | |
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124 | /* |
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125 | * Map port A (1) to stdin, stdout, and stderr. |
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126 | * Map everything else to port B (0). |
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127 | */ |
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128 | |
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129 | int __read(int fd, char *buf, int nbytes) |
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130 | { |
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131 | int i, port; |
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132 | |
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133 | if ( fd <= 2 ) port = 1; |
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134 | else port = 0; |
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135 | |
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136 | for (i = 0; i < nbytes; i++) { |
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137 | *(buf + i) = char_wait(port); |
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138 | if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) { |
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139 | (*(buf + i++)) = '\n'; |
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140 | (*(buf + i)) = 0; |
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141 | break; |
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142 | } |
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143 | } |
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144 | return (i); |
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145 | } |
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146 | |
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147 | /* |
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148 | * Map port A (1) to stdin, stdout, and stderr. |
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149 | * Map everything else to port B (0). |
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150 | */ |
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151 | |
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152 | int __write(int fd, char *buf, int nbytes) |
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153 | { |
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154 | int i, port; |
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155 | |
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156 | if ( fd <= 2 ) port = 1; |
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157 | else port = 0; |
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158 | |
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159 | for (i = 0; i < nbytes; i++) { |
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160 | if (*(buf + i) == '\n') { |
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161 | char_put (port, '\r'); |
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162 | } |
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163 | char_put (port, *(buf + i)); |
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164 | } |
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165 | return (nbytes); |
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166 | } |
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