1 | /* |
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2 | * This file contains the TTY driver for the serial ports on the DMV152. |
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3 | * The serial ports use a Zilog Z8530. |
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4 | * |
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5 | * NOTE: This driver uses the termios pseudo driver. |
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6 | * This driver is polled only. |
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7 | * |
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8 | * COPYRIGHT (c) 1989-1999. |
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9 | * On-Line Applications Research Corporation (OAR). |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.com/license/LICENSE. |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | #include <bsp.h> |
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19 | #include <rtems/libio.h> |
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20 | #include <stdlib.h> |
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21 | #include <assert.h> |
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22 | |
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23 | /* |
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24 | * console_outbyte_polled |
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25 | * |
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26 | * This routine transmits a character using polling. |
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27 | */ |
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28 | |
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29 | void console_outbyte_polled( |
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30 | int port, |
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31 | char ch |
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32 | ) |
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33 | { |
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34 | uint32_t control; |
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35 | uint32_t data; |
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36 | uint8_t rr_0; |
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37 | |
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38 | if ( port == 0 ) { |
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39 | control = CONSOLE_CONTROL_A; |
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40 | data = CONSOLE_DATA_A; |
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41 | } else { |
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42 | control = CONSOLE_CONTROL_B; |
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43 | data = CONSOLE_DATA_B; |
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44 | } |
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45 | |
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46 | for ( ; ; ) { |
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47 | Z8x30_READ_CONTROL( control, RR_0, rr_0 ); |
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48 | if ( (rr_0 & RR_0_TX_BUFFER_EMPTY) != 0 ) |
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49 | break; |
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50 | } |
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51 | |
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52 | Z8x30_WRITE_DATA( control, ch ); |
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53 | } |
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54 | |
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55 | /* |
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56 | * console_inbyte_nonblocking |
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57 | * |
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58 | * This routine polls for a character. |
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59 | */ |
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60 | |
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61 | int console_inbyte_nonblocking(int port) |
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62 | { |
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63 | uint32_t control; |
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64 | uint32_t data; |
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65 | uint8_t rr_0; |
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66 | char ch; |
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67 | |
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68 | if ( port == 0 ) { |
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69 | control = CONSOLE_CONTROL_A; |
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70 | data = CONSOLE_DATA_A; |
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71 | } else { |
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72 | control = CONSOLE_CONTROL_B; |
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73 | data = CONSOLE_DATA_B; |
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74 | } |
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75 | |
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76 | Z8x30_READ_CONTROL( control, RR_0, rr_0 ); |
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77 | if ( !(rr_0 & RR_0_RX_DATA_AVAILABLE) ) |
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78 | return -1; |
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79 | |
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80 | Z8x30_READ_DATA( data, ch ); |
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81 | return (int) ch; |
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82 | } |
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83 | |
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84 | /* |
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85 | * DEBUG_puts |
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86 | * |
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87 | * This should be safe in the event of an error. It attempts to insure |
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88 | * that no TX empty interrupts occur while it is doing polled IO. Then |
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89 | * it restores the state of that external interrupt. |
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90 | * |
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91 | * Input parameters: |
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92 | * string - pointer to debug output string |
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93 | * |
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94 | * Output parameters: NONE |
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95 | * |
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96 | * Return values: NONE |
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97 | */ |
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98 | |
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99 | void DEBUG_puts( |
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100 | char *string |
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101 | ) |
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102 | { |
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103 | char *s; |
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104 | |
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105 | /* should disable interrupts here */ |
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106 | for ( s = string ; *s ; s++ ) |
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107 | console_outbyte_polled( 0, *s ); |
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108 | |
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109 | console_outbyte_polled( 0, '\r' ); |
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110 | console_outbyte_polled( 0, '\n' ); |
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111 | /* should enable interrupts here */ |
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112 | } |
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113 | |
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114 | |
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115 | /* |
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116 | * Console Termios Support Entry Points |
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117 | * |
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118 | */ |
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119 | |
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120 | int console_write_support (int minor, const char *buf, int len) |
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121 | { |
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122 | int nwrite = 0; |
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123 | |
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124 | while (nwrite < len) { |
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125 | console_outbyte_polled( minor, *buf++ ); |
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126 | nwrite++; |
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127 | } |
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128 | return nwrite; |
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129 | } |
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130 | |
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131 | /* |
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132 | * Console Device Driver Entry Points |
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133 | * |
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134 | */ |
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135 | |
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136 | rtems_device_driver console_initialize( |
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137 | rtems_device_major_number major, |
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138 | rtems_device_minor_number minor, |
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139 | void *arg |
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140 | ) |
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141 | { |
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142 | rtems_status_code status; |
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143 | rtems_device_minor_number console_minor; |
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144 | |
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145 | rtems_termios_initialize(); |
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146 | |
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147 | /* |
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148 | * Register Device Names |
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149 | */ |
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150 | |
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151 | #if (USE_CHANNEL_A == 1) |
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152 | console_minor = 0; |
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153 | #elif (USE_CHANNEL_B == 1) |
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154 | console_minor = 1; |
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155 | #else |
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156 | #error "DMV152 Console Driver -- no console port configured!!!" |
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157 | #endif |
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158 | |
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159 | status = rtems_io_register_name( "/dev/console", major, console_minor ); |
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160 | if (status != RTEMS_SUCCESSFUL) |
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161 | rtems_fatal_error_occurred(status); |
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162 | |
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163 | status = rtems_io_register_name( "/dev/console_a", major, 0 ); |
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164 | if (status != RTEMS_SUCCESSFUL) |
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165 | rtems_fatal_error_occurred(status); |
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166 | |
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167 | status = rtems_io_register_name( "/dev/console_b", major, 1 ); |
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168 | if (status != RTEMS_SUCCESSFUL) |
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169 | rtems_fatal_error_occurred(status); |
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170 | |
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171 | /* |
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172 | * Initialize Hardware |
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173 | */ |
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174 | |
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175 | return RTEMS_SUCCESSFUL; |
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176 | } |
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177 | |
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178 | rtems_device_driver console_open( |
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179 | rtems_device_major_number major, |
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180 | rtems_device_minor_number minor, |
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181 | void * arg |
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182 | ) |
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183 | { |
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184 | rtems_status_code sc; |
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185 | static const rtems_termios_callbacks pollCallbacks = { |
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186 | NULL, /* firstOpen */ |
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187 | NULL, /* lastClose */ |
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188 | console_inbyte_nonblocking, /* pollRead */ |
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189 | console_write_support, /* write */ |
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190 | NULL, /* setAttributes */ |
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191 | NULL, /* stopRemoteTx */ |
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192 | NULL, /* startRemoteTx */ |
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193 | 0 /* outputUsesInterrupts */ |
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194 | }; |
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195 | |
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196 | assert( minor <= 1 ); |
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197 | if ( minor > 2 ) |
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198 | return RTEMS_INVALID_NUMBER; |
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199 | |
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200 | sc = rtems_termios_open (major, minor, arg, &pollCallbacks ); |
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201 | |
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202 | return RTEMS_SUCCESSFUL; |
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203 | } |
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204 | |
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205 | rtems_device_driver console_close( |
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206 | rtems_device_major_number major, |
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207 | rtems_device_minor_number minor, |
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208 | void * arg |
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209 | ) |
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210 | { |
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211 | return rtems_termios_close (arg); |
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212 | } |
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213 | |
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214 | rtems_device_driver console_read( |
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215 | rtems_device_major_number major, |
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216 | rtems_device_minor_number minor, |
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217 | void * arg |
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218 | ) |
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219 | { |
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220 | return rtems_termios_read (arg); |
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221 | } |
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222 | |
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223 | rtems_device_driver console_write( |
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224 | rtems_device_major_number major, |
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225 | rtems_device_minor_number minor, |
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226 | void * arg |
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227 | ) |
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228 | { |
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229 | return rtems_termios_write (arg); |
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230 | } |
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231 | |
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232 | rtems_device_driver console_control( |
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233 | rtems_device_major_number major, |
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234 | rtems_device_minor_number minor, |
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235 | void * arg |
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236 | ) |
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237 | { |
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238 | return rtems_termios_ioctl (arg); |
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239 | } |
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240 | |
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