1 | /* |
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2 | * This file contains the termios TTY driver for the Motorola MC68681. |
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3 | * |
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4 | * This part is available from a number of secondary sources. |
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5 | * In particular, we know about the following: |
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6 | * |
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7 | * + Exar 88c681 and 68c681 |
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8 | * |
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9 | * COPYRIGHT (c) 1989-1998. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * Copyright assigned to U.S. Government, 1994. |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.OARcorp.com/rtems/license.html. |
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16 | * |
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17 | * $Id$ |
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18 | */ |
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19 | |
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20 | #include <rtems.h> |
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21 | #include <rtems/libio.h> |
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22 | #include <stdlib.h> |
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23 | #include <ringbuf.h> |
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24 | |
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25 | #include <libchip/serial.h> |
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26 | #include "mc68681_p.h" |
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27 | #include "mc68681.h" |
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28 | |
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29 | /* |
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30 | * Flow control is only supported when using interrupts |
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31 | */ |
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32 | |
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33 | console_flow mc68681_flow_RTSCTS = |
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34 | { |
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35 | mc68681_negate_RTS, /* deviceStopRemoteTx */ |
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36 | mc68681_assert_RTS /* deviceStartRemoteTx */ |
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37 | }; |
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38 | |
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39 | console_flow mc68681_flow_DTRCTS = |
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40 | { |
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41 | mc68681_negate_DTR, /* deviceStopRemoteTx */ |
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42 | mc68681_assert_DTR /* deviceStartRemoteTx */ |
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43 | }; |
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44 | |
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45 | console_fns mc68681_fns = |
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46 | { |
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47 | mc68681_probe, /* deviceProbe */ |
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48 | mc68681_open, /* deviceFirstOpen */ |
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49 | mc68681_flush, /* deviceLastClose */ |
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50 | NULL, /* deviceRead */ |
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51 | mc68681_write_support_int, /* deviceWrite */ |
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52 | mc68681_initialize_interrupts, /* deviceInitialize */ |
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53 | mc68681_write_polled, /* deviceWritePolled */ |
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54 | mc68681_set_attributes, /* deviceSetAttributes */ |
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55 | FALSE, /* deviceOutputUsesInterrupts */ |
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56 | }; |
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57 | |
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58 | console_fns mc68681_fns_polled = |
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59 | { |
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60 | mc68681_probe, /* deviceProbe */ |
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61 | mc68681_open, /* deviceFirstOpen */ |
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62 | mc68681_close, /* deviceLastClose */ |
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63 | mc68681_inbyte_nonblocking_polled, /* deviceRead */ |
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64 | mc68681_write_support_polled, /* deviceWrite */ |
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65 | mc68681_init, /* deviceInitialize */ |
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66 | mc68681_write_polled, /* deviceWritePolled */ |
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67 | mc68681_set_attributes, /* deviceSetAttributes */ |
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68 | FALSE, /* deviceOutputUsesInterrupts */ |
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69 | }; |
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70 | |
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71 | extern void set_vector( rtems_isr_entry, rtems_vector_number, int ); |
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72 | |
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73 | /* |
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74 | * Console Device Driver Entry Points |
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75 | */ |
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76 | |
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77 | /* |
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78 | * mc68681_probe |
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79 | * |
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80 | * Default probe routine which simply say the port is present. |
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81 | */ |
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82 | |
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83 | static boolean mc68681_probe(int minor) |
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84 | { |
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85 | /* |
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86 | * If the configuration dependent probe has located the device then |
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87 | * assume it is there |
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88 | */ |
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89 | return(TRUE); |
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90 | } |
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91 | |
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92 | /* |
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93 | * mc68681_baud_rate |
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94 | * |
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95 | * This routine returns the proper ACR bit and baud rate field values |
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96 | * based on the requested baud rate. The baud rate set to be used |
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97 | * must be configured by the user. |
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98 | */ |
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99 | |
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100 | static int mc68681_baud_rate( |
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101 | int minor, |
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102 | int baud, |
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103 | unsigned int *baud_mask_p, |
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104 | unsigned int *acr_bit_p |
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105 | ) |
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106 | { |
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107 | unsigned int baud_mask; |
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108 | unsigned int acr_bit; |
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109 | int status; |
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110 | |
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111 | baud_mask = 0; |
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112 | acr_bit = 0; |
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113 | status = 0; |
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114 | |
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115 | if ( !(Console_Port_Tbl[minor].ulDataPort & MC68681_DATA_BAUD_RATE_SET_1) ) |
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116 | acr_bit = 1; |
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117 | |
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118 | if (!(baud & CBAUD)) { |
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119 | *baud_mask_p = 0x0B; /* default to 9600 baud */ |
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120 | *acr_bit_p = acr_bit; |
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121 | return status; |
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122 | } |
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123 | |
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124 | if ( !acr_bit ) { |
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125 | switch (baud & CBAUD) { |
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126 | case B50: baud_mask = 0x00; break; |
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127 | case B110: baud_mask = 0x01; break; |
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128 | case B134: baud_mask = 0x02; break; |
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129 | case B200: baud_mask = 0x03; break; |
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130 | case B300: baud_mask = 0x04; break; |
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131 | case B600: baud_mask = 0x05; break; |
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132 | case B1200: baud_mask = 0x06; break; |
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133 | case B2400: baud_mask = 0x08; break; |
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134 | case B4800: baud_mask = 0x09; break; |
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135 | case B9600: baud_mask = 0x0B; break; |
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136 | case B38400: baud_mask = 0x0C; break; |
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137 | |
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138 | case B0: |
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139 | case B75: |
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140 | case B150: |
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141 | case B1800: |
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142 | case B19200: |
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143 | case B57600: |
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144 | case B115200: |
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145 | case B230400: |
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146 | case B460800: |
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147 | status = -1; |
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148 | break; |
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149 | } |
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150 | } else { |
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151 | switch (baud & CBAUD) { |
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152 | case B75: baud_mask = 0x00; break; |
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153 | case B110: baud_mask = 0x01; break; |
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154 | case B134: baud_mask = 0x02; break; |
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155 | case B150: baud_mask = 0x03; break; |
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156 | case B300: baud_mask = 0x04; break; |
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157 | case B600: baud_mask = 0x05; break; |
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158 | case B1200: baud_mask = 0x06; break; |
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159 | case B1800: baud_mask = 0x0A; break; |
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160 | case B2400: baud_mask = 0x08; break; |
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161 | case B4800: baud_mask = 0x09; break; |
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162 | case B9600: baud_mask = 0x0B; break; |
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163 | case B19200: baud_mask = 0x0C; break; |
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164 | |
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165 | case B0: |
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166 | case B50: |
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167 | case B200: |
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168 | case B38400: |
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169 | case B57600: |
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170 | case B115200: |
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171 | case B230400: |
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172 | case B460800: |
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173 | status = -1; |
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174 | break; |
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175 | } |
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176 | } |
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177 | |
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178 | *baud_mask_p = baud_mask; |
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179 | *acr_bit_p = acr_bit; |
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180 | return status; |
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181 | } |
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182 | |
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183 | /* |
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184 | * mc68681_set_attributes |
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185 | * |
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186 | * This function sets the DUART channel to reflect the requested termios |
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187 | * port settings. |
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188 | */ |
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189 | |
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190 | static int mc68681_set_attributes( |
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191 | int minor, |
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192 | const struct termios *t |
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193 | ) |
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194 | { |
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195 | unsigned32 pMC68681_port; |
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196 | unsigned32 pMC68681; |
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197 | unsigned int mode1; |
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198 | unsigned int mode2; |
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199 | unsigned int baud_mask; |
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200 | unsigned int acr_bit; |
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201 | setRegister_f setReg; |
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202 | rtems_interrupt_level Irql; |
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203 | |
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204 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort1; |
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205 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort2; |
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206 | setReg = Console_Port_Tbl[minor].setRegister; |
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207 | |
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208 | /* |
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209 | * Set the baud rate |
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210 | */ |
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211 | |
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212 | if ( mc68681_baud_rate( minor, t->c_cflag, &baud_mask, &acr_bit ) == -1 ) |
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213 | return -1; |
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214 | |
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215 | baud_mask |= baud_mask << 4; |
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216 | acr_bit <<= 7; |
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217 | |
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218 | /* |
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219 | * Parity |
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220 | */ |
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221 | |
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222 | mode1 = 0; |
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223 | mode2 = 0; |
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224 | |
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225 | if (t->c_cflag & PARENB) { |
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226 | if (t->c_cflag & PARODD) |
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227 | mode1 |= 0x04; |
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228 | else |
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229 | mode1 |= 0x04; |
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230 | } else { |
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231 | mode1 |= 0x10; |
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232 | } |
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233 | |
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234 | /* |
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235 | * Character Size |
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236 | */ |
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237 | |
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238 | if (t->c_cflag & CSIZE) { |
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239 | switch (t->c_cflag & CSIZE) { |
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240 | case CS5: break; |
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241 | case CS6: mode1 |= 0x01; break; |
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242 | case CS7: mode1 |= 0x02; break; |
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243 | case CS8: mode1 |= 0x03; break; |
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244 | } |
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245 | } else { |
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246 | mode1 |= 0x03; /* default to 9600,8,N,1 */ |
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247 | } |
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248 | |
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249 | /* |
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250 | * Stop Bits |
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251 | */ |
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252 | |
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253 | if (t->c_cflag & CSTOPB) { |
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254 | mode2 |= 0x07; /* 2 stop bits */ |
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255 | } else { |
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256 | if ((t->c_cflag & CSIZE) == CS5) /* CS5 and 2 stop bits not supported */ |
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257 | return -1; |
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258 | mode2 |= 0x0F; /* 1 stop bit */ |
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259 | } |
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260 | |
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261 | rtems_interrupt_disable(Irql); |
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262 | (*setReg)( pMC68681, MC68681_AUX_CTRL_REG, acr_bit ); |
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263 | (*setReg)( pMC68681_port, MC68681_CLOCK_SELECT, baud_mask ); |
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264 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_MR_PTR ); |
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265 | (*setReg)( pMC68681_port, MC68681_MODE, mode1 ); |
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266 | (*setReg)( pMC68681_port, MC68681_MODE, mode2 ); |
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267 | rtems_interrupt_enable(Irql); |
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268 | return 0; |
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269 | } |
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270 | |
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271 | /* |
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272 | * mc68681_initialize_context |
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273 | * |
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274 | * This function sets the default values of the per port context structure. |
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275 | */ |
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276 | |
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277 | static void mc68681_initialize_context( |
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278 | int minor, |
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279 | mc68681_context *pmc68681Context |
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280 | ) |
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281 | { |
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282 | int port; |
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283 | unsigned int pMC68681; |
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284 | |
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285 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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286 | |
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287 | pmc68681Context->mate = -1; |
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288 | |
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289 | for (port=0 ; port<Console_Port_Count ; port++ ) { |
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290 | if ( Console_Port_Tbl[port].ulCtrlPort1 == pMC68681 ) { |
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291 | pmc68681Context->mate = port; |
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292 | break; |
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293 | } |
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294 | } |
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295 | |
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296 | pmc68681Context->ucModemCtrl = 0x00; /* XXX */ |
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297 | } |
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298 | |
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299 | /* |
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300 | * mc68681_build_imr |
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301 | * |
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302 | * This function returns the value for the interrupt mask register for this |
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303 | * DUART. Since this is a shared register, we must look at the other port |
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304 | * on this chip to determine whether or not it is using interrupts. |
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305 | */ |
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306 | |
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307 | static unsigned int mc68681_build_imr( |
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308 | int minor |
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309 | ) |
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310 | { |
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311 | int mate; |
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312 | unsigned int mask; |
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313 | unsigned int mate_mask; |
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314 | unsigned int pMC68681; |
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315 | unsigned int pMC68681_port; |
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316 | mc68681_context *pmc68681Context; |
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317 | |
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318 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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319 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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320 | pmc68681Context = (mc68681_context *) Console_Port_Data[minor].pDeviceContext; |
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321 | mate = pmc68681Context->mate; |
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322 | |
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323 | mate_mask = 0; |
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324 | |
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325 | /* |
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326 | * Decide if the other port on this DUART is using interrupts |
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327 | */ |
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328 | |
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329 | if ( mate != -1 ) { |
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330 | if ( Console_Port_Tbl[mate].pDeviceFns->deviceOutputUsesInterrupts ) |
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331 | mate_mask = 0x03; |
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332 | |
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333 | /* |
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334 | * If equal, then minor is A so the mate must be B |
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335 | */ |
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336 | |
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337 | if ( pMC68681 == pMC68681_port ) |
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338 | mate_mask <<= 4; |
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339 | } |
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340 | |
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341 | /* |
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342 | * Add in minor's mask |
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343 | */ |
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344 | |
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345 | mask = 0; |
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346 | if ( Console_Port_Tbl[minor].pDeviceFns->deviceOutputUsesInterrupts ) { |
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347 | if ( pMC68681 == pMC68681_port ) |
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348 | mask = 0x03; |
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349 | else |
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350 | mask = 0x30; |
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351 | } |
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352 | |
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353 | return mask | mate_mask; |
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354 | } |
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355 | |
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356 | /* |
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357 | * mc68681_init |
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358 | * |
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359 | * This function initializes the DUART to a quiecsent state. |
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360 | */ |
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361 | |
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362 | static void mc68681_init(int minor) |
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363 | { |
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364 | unsigned32 pMC68681_port; |
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365 | unsigned32 pMC68681; |
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366 | mc68681_context *pmc68681Context; |
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367 | setRegister_f setReg; |
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368 | getRegister_f getReg; |
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369 | |
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370 | pmc68681Context = (mc68681_context *) malloc(sizeof(mc68681_context)); |
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371 | |
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372 | Console_Port_Data[minor].pDeviceContext = (void *)pmc68681Context; |
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373 | |
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374 | mc68681_initialize_context( minor, pmc68681Context ); |
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375 | |
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376 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort1; |
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377 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort2; |
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378 | setReg = Console_Port_Tbl[minor].setRegister; |
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379 | getReg = Console_Port_Tbl[minor].getRegister; |
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380 | |
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381 | /* |
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382 | * Reset everything and leave this port disabled. |
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383 | */ |
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384 | |
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385 | (*setReg)( pMC68681, MC68681_COMMAND, MC68681_MODE_REG_RESET_RX ); |
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386 | (*setReg)( pMC68681, MC68681_COMMAND, MC68681_MODE_REG_RESET_TX ); |
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387 | (*setReg)( pMC68681, MC68681_COMMAND, MC68681_MODE_REG_RESET_ERROR ); |
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388 | (*setReg)( pMC68681, MC68681_COMMAND, MC68681_MODE_REG_RESET_BREAK ); |
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389 | (*setReg)( pMC68681, MC68681_COMMAND, MC68681_MODE_REG_STOP_BREAK ); |
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390 | (*setReg)( pMC68681, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_TX ); |
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391 | (*setReg)( pMC68681, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_RX ); |
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392 | |
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393 | |
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394 | (*setReg)( pMC68681, MC68681_MODE_REG_1A, 0x00 ); |
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395 | (*setReg)( pMC68681, MC68681_MODE_REG_2A, 0x02 ); |
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396 | } |
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397 | |
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398 | /* |
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399 | * mc68681_open |
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400 | * |
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401 | * This function opens a port for communication. |
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402 | * |
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403 | * Default state is 9600 baud, 8 bits, No parity, and 1 stop bit. |
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404 | */ |
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405 | |
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406 | static int mc68681_open( |
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407 | int major, |
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408 | int minor, |
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409 | void *arg |
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410 | ) |
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411 | { |
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412 | unsigned32 pMC68681; |
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413 | unsigned32 pMC68681_port; |
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414 | unsigned int baud; |
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415 | unsigned int acr; |
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416 | unsigned int vector; |
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417 | rtems_interrupt_level Irql; |
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418 | setRegister_f setReg; |
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419 | |
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420 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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421 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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422 | setReg = Console_Port_Tbl[minor].setRegister; |
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423 | vector = Console_Port_Tbl[minor].ulIntVector; |
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424 | |
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425 | (void) mc68681_baud_rate( minor, B9600, &baud, &acr ); |
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426 | |
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427 | /* |
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428 | * Set the DUART channel to a default useable state |
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429 | */ |
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430 | |
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431 | rtems_interrupt_disable(Irql); |
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432 | (*setReg)( pMC68681, MC68681_AUX_CTRL_REG, acr ); |
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433 | (*setReg)( pMC68681_port, MC68681_CLOCK_SELECT, baud ); |
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434 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_MR_PTR ); |
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435 | (*setReg)( pMC68681_port, MC68681_MODE, 0x13 ); |
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436 | (*setReg)( pMC68681_port, MC68681_MODE, 0x07 ); |
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437 | rtems_interrupt_enable(Irql); |
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438 | |
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439 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_ENABLE_TX ); |
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440 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_ENABLE_RX ); |
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441 | |
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442 | (*setReg)( pMC68681, MC68681_INTERRUPT_VECTOR_REG, vector ); |
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443 | |
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444 | /* |
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445 | * Assert DTR |
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446 | */ |
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447 | |
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448 | if(Console_Port_Tbl[minor].pDeviceFlow != &mc68681_flow_DTRCTS) { |
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449 | mc68681_assert_DTR(minor); |
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450 | } |
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451 | |
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452 | return(RTEMS_SUCCESSFUL); |
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453 | } |
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454 | |
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455 | /* |
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456 | * mc68681_close |
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457 | * |
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458 | * This function shuts down the requested port. |
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459 | */ |
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460 | |
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461 | static int mc68681_close( |
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462 | int major, |
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463 | int minor, |
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464 | void *arg |
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465 | ) |
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466 | { |
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467 | unsigned32 pMC68681; |
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468 | unsigned32 pMC68681_port; |
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469 | setRegister_f setReg; |
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470 | |
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471 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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472 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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473 | setReg = Console_Port_Tbl[minor].setRegister; |
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474 | |
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475 | /* |
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476 | * Disable interrupts from this channel and then disable it totally. |
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477 | */ |
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478 | |
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479 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_TX ); |
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480 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_RX ); |
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481 | |
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482 | /* |
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483 | * Negate DTR |
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484 | */ |
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485 | |
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486 | if(Console_Port_Tbl[minor].pDeviceFlow != &mc68681_flow_DTRCTS) { |
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487 | mc68681_negate_DTR(minor); |
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488 | } |
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489 | |
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490 | return(RTEMS_SUCCESSFUL); |
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491 | } |
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492 | |
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493 | /* |
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494 | * mc68681_write_polled |
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495 | * |
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496 | * This routine polls out the requested character. |
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497 | */ |
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498 | |
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499 | static void mc68681_write_polled( |
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500 | int minor, |
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501 | char cChar |
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502 | ) |
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503 | { |
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504 | unsigned32 pMC68681_port; |
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505 | unsigned char ucLineStatus; |
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506 | int iTimeout; |
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507 | getRegister_f getReg; |
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508 | setRegister_f setReg; |
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509 | |
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510 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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511 | getReg = Console_Port_Tbl[minor].getRegister; |
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512 | setReg = Console_Port_Tbl[minor].setRegister; |
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513 | |
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514 | /* |
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515 | * wait for transmitter holding register to be empty |
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516 | */ |
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517 | iTimeout = 1000; |
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518 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
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519 | while ((ucLineStatus & MC68681_TX_READY) == 0) { |
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520 | |
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521 | /* |
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522 | * Yield while we wait |
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523 | */ |
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524 | |
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525 | if(_System_state_Is_up(_System_state_Get())) { |
---|
526 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
---|
527 | } |
---|
528 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
---|
529 | if(!--iTimeout) { |
---|
530 | break; |
---|
531 | } |
---|
532 | } |
---|
533 | |
---|
534 | /* |
---|
535 | * transmit character |
---|
536 | */ |
---|
537 | |
---|
538 | (*setReg)(pMC68681_port, MC68681_TX_BUFFER, cChar); |
---|
539 | } |
---|
540 | |
---|
541 | /* |
---|
542 | * These routines provide control of the RTS and DTR lines |
---|
543 | */ |
---|
544 | |
---|
545 | /* |
---|
546 | * mc68681_assert_RTS |
---|
547 | */ |
---|
548 | |
---|
549 | static int mc68681_assert_RTS(int minor) |
---|
550 | { |
---|
551 | /* XXX */ |
---|
552 | |
---|
553 | unsigned32 pMC68681; |
---|
554 | unsigned32 Irql; |
---|
555 | mc68681_context *pmc68681Context; |
---|
556 | setRegister_f setReg; |
---|
557 | |
---|
558 | |
---|
559 | pmc68681Context = (mc68681_context *) Console_Port_Data[minor].pDeviceContext; |
---|
560 | |
---|
561 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
562 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
563 | |
---|
564 | /* |
---|
565 | * Assert RTS |
---|
566 | */ |
---|
567 | rtems_interrupt_disable(Irql); |
---|
568 | #if 0 |
---|
569 | pmc68681Context->ucModemCtrl |= SP_MODEM_RTS; |
---|
570 | (*setReg)(pMC68681, MC68681_MODEM_CONTROL, pmc68681Context->ucModemCtrl); |
---|
571 | #endif |
---|
572 | rtems_interrupt_enable(Irql); |
---|
573 | return 0; |
---|
574 | } |
---|
575 | |
---|
576 | /* |
---|
577 | * mc68681_negate_RTS |
---|
578 | */ |
---|
579 | |
---|
580 | static int mc68681_negate_RTS(int minor) |
---|
581 | { |
---|
582 | /* XXX */ |
---|
583 | unsigned32 pMC68681; |
---|
584 | unsigned32 Irql; |
---|
585 | mc68681_context *pmc68681Context; |
---|
586 | setRegister_f setReg; |
---|
587 | |
---|
588 | pmc68681Context = (mc68681_context *) Console_Port_Data[minor].pDeviceContext; |
---|
589 | |
---|
590 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
591 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
592 | |
---|
593 | /* |
---|
594 | * Negate RTS |
---|
595 | */ |
---|
596 | rtems_interrupt_disable(Irql); |
---|
597 | #if 0 |
---|
598 | pmc68681Context->ucModemCtrl &= ~SP_MODEM_RTS; |
---|
599 | (*setReg)(pMC68681, MC68681_MODEM_CONTROL, pmc68681Context->ucModemCtrl); |
---|
600 | #endif |
---|
601 | rtems_interrupt_enable(Irql); |
---|
602 | return 0; |
---|
603 | } |
---|
604 | |
---|
605 | /* |
---|
606 | * These flow control routines utilize a connection from the local DTR |
---|
607 | * line to the remote CTS line |
---|
608 | */ |
---|
609 | |
---|
610 | /* |
---|
611 | * mc68681_assert_DTR |
---|
612 | */ |
---|
613 | |
---|
614 | static int mc68681_assert_DTR(int minor) |
---|
615 | { |
---|
616 | /* XXX */ |
---|
617 | unsigned32 pMC68681; |
---|
618 | unsigned32 Irql; |
---|
619 | mc68681_context *pmc68681Context; |
---|
620 | setRegister_f setReg; |
---|
621 | |
---|
622 | pmc68681Context = (mc68681_context *) Console_Port_Data[minor].pDeviceContext; |
---|
623 | |
---|
624 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
625 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
626 | |
---|
627 | /* |
---|
628 | * Assert DTR |
---|
629 | */ |
---|
630 | rtems_interrupt_disable(Irql); |
---|
631 | #if 0 |
---|
632 | pmc68681Context->ucModemCtrl |= SP_MODEM_DTR; |
---|
633 | (*setReg)(pMC68681, MC68681_MODEM_CONTROL, pmc68681Context->ucModemCtrl); |
---|
634 | #endif |
---|
635 | rtems_interrupt_enable(Irql); |
---|
636 | return 0; |
---|
637 | } |
---|
638 | |
---|
639 | /* |
---|
640 | * mc68681_negate_DTR |
---|
641 | */ |
---|
642 | |
---|
643 | static int mc68681_negate_DTR(int minor) |
---|
644 | { |
---|
645 | /* XXX */ |
---|
646 | unsigned32 pMC68681; |
---|
647 | unsigned32 Irql; |
---|
648 | mc68681_context *pmc68681Context; |
---|
649 | setRegister_f setReg; |
---|
650 | |
---|
651 | pmc68681Context = (mc68681_context *) Console_Port_Data[minor].pDeviceContext; |
---|
652 | |
---|
653 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
654 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
655 | |
---|
656 | /* |
---|
657 | * Negate DTR |
---|
658 | */ |
---|
659 | rtems_interrupt_disable(Irql); |
---|
660 | #if 0 |
---|
661 | pmc68681Context->ucModemCtrl &= ~SP_MODEM_DTR; |
---|
662 | (*setReg)(pMC68681, MC68681_MODEM_CONTROL,pmc68681Context->ucModemCtrl); |
---|
663 | #endif |
---|
664 | rtems_interrupt_enable(Irql); |
---|
665 | return 0; |
---|
666 | } |
---|
667 | |
---|
668 | /* |
---|
669 | * mc68681_isr |
---|
670 | * |
---|
671 | * This routine is the console interrupt handler. |
---|
672 | */ |
---|
673 | |
---|
674 | static void mc68681_process( |
---|
675 | int minor |
---|
676 | ) |
---|
677 | { |
---|
678 | /* XXX */ |
---|
679 | unsigned32 pMC68681; |
---|
680 | volatile unsigned8 ucLineStatus; |
---|
681 | volatile unsigned8 ucInterruptId; |
---|
682 | char cChar; |
---|
683 | getRegister_f getReg; |
---|
684 | setRegister_f setReg; |
---|
685 | |
---|
686 | #if 1 |
---|
687 | cChar = ucInterruptId = ucLineStatus = 0; |
---|
688 | #endif |
---|
689 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
690 | getReg = Console_Port_Tbl[minor].getRegister; |
---|
691 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
692 | |
---|
693 | #if 0 |
---|
694 | do { |
---|
695 | /* |
---|
696 | * Deal with any received characters |
---|
697 | */ |
---|
698 | while(TRUE) { |
---|
699 | ucLineStatus = (*getReg)(pMC68681, MC68681_LINE_STATUS); |
---|
700 | if(~ucLineStatus & SP_LSR_RDY) { |
---|
701 | break; |
---|
702 | } |
---|
703 | cChar = (*getReg)(pMC68681, MC68681_RECEIVE_BUFFER); |
---|
704 | rtems_termios_enqueue_raw_characters( |
---|
705 | Console_Port_Data[minor].termios_data, |
---|
706 | &cChar, |
---|
707 | 1 |
---|
708 | ); |
---|
709 | } |
---|
710 | |
---|
711 | while(TRUE) { |
---|
712 | if(Ring_buffer_Is_empty(&Console_Port_Data[minor].TxBuffer)) { |
---|
713 | Console_Port_Data[minor].bActive = FALSE; |
---|
714 | if(Console_Port_Tbl[minor].pDeviceFlow != &mc68681_flow_RTSCTS) { |
---|
715 | mc68681_negate_RTS(minor); |
---|
716 | } |
---|
717 | |
---|
718 | /* |
---|
719 | * There is no data to transmit |
---|
720 | */ |
---|
721 | break; |
---|
722 | } |
---|
723 | |
---|
724 | ucLineStatus = (*getReg)(pMC68681, MC68681_LINE_STATUS); |
---|
725 | if(~ucLineStatus & SP_LSR_THOLD) { |
---|
726 | /* |
---|
727 | * We'll get another interrupt when |
---|
728 | * the transmitter holding reg. becomes |
---|
729 | * free again |
---|
730 | */ |
---|
731 | break; |
---|
732 | } |
---|
733 | |
---|
734 | Ring_buffer_Remove_character( &Console_Port_Data[minor].TxBuffer, cChar); |
---|
735 | /* |
---|
736 | * transmit character |
---|
737 | */ |
---|
738 | (*setReg)(pMC68681, MC68681_TRANSMIT_BUFFER, cChar); |
---|
739 | } |
---|
740 | |
---|
741 | ucInterruptId = (*getReg)(pMC68681, MC68681_INTERRUPT_ID); |
---|
742 | } |
---|
743 | while((ucInterruptId&0xf) != 0x1); |
---|
744 | #endif |
---|
745 | } |
---|
746 | |
---|
747 | static rtems_isr mc68681_isr( |
---|
748 | rtems_vector_number vector |
---|
749 | ) |
---|
750 | { |
---|
751 | int minor; |
---|
752 | |
---|
753 | for(minor=0 ; minor<Console_Port_Count ; minor++) { |
---|
754 | if(vector == Console_Port_Tbl[minor].ulIntVector) { |
---|
755 | mc68681_process(minor); |
---|
756 | } |
---|
757 | } |
---|
758 | } |
---|
759 | |
---|
760 | /* |
---|
761 | * mc68681_flush |
---|
762 | * |
---|
763 | * This routine waits before all output is completed before closing |
---|
764 | * the requested port. |
---|
765 | * |
---|
766 | * NOTE: This is the "interrupt mode" close entry point. |
---|
767 | */ |
---|
768 | |
---|
769 | static int mc68681_flush(int major, int minor, void *arg) |
---|
770 | { |
---|
771 | while(!Ring_buffer_Is_empty(&Console_Port_Data[minor].TxBuffer)) { |
---|
772 | /* |
---|
773 | * Yield while we wait |
---|
774 | */ |
---|
775 | if(_System_state_Is_up(_System_state_Get())) { |
---|
776 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
---|
777 | } |
---|
778 | } |
---|
779 | |
---|
780 | mc68681_close(major, minor, arg); |
---|
781 | |
---|
782 | return(RTEMS_SUCCESSFUL); |
---|
783 | } |
---|
784 | |
---|
785 | /* |
---|
786 | * mc68681_enable_interrupts |
---|
787 | * |
---|
788 | * This function initializes the hardware for this port to use interrupts. |
---|
789 | */ |
---|
790 | |
---|
791 | static void mc68681_enable_interrupts( |
---|
792 | int minor |
---|
793 | ) |
---|
794 | { |
---|
795 | unsigned32 pMC68681; |
---|
796 | setRegister_f setReg; |
---|
797 | |
---|
798 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
799 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
800 | |
---|
801 | /* |
---|
802 | * Enable interrupts on RX and TX -- not break |
---|
803 | */ |
---|
804 | |
---|
805 | (*setReg)( pMC68681, MC68681_INTERRUPT_MASK_REG, mc68681_build_imr( minor )); |
---|
806 | } |
---|
807 | |
---|
808 | /* |
---|
809 | * mc68681_initialize_interrupts |
---|
810 | * |
---|
811 | * This routine initializes the console's receive and transmit |
---|
812 | * ring buffers and loads the appropriate vectors to handle the interrupts. |
---|
813 | */ |
---|
814 | |
---|
815 | static void mc68681_initialize_interrupts(int minor) |
---|
816 | { |
---|
817 | mc68681_init(minor); |
---|
818 | |
---|
819 | Ring_buffer_Initialize(&Console_Port_Data[minor].TxBuffer); |
---|
820 | |
---|
821 | Console_Port_Data[minor].bActive = FALSE; |
---|
822 | |
---|
823 | set_vector(mc68681_isr, Console_Port_Tbl[minor].ulIntVector, 1); |
---|
824 | |
---|
825 | mc68681_enable_interrupts(minor); |
---|
826 | } |
---|
827 | |
---|
828 | /* |
---|
829 | * mc68681_write_support_int |
---|
830 | * |
---|
831 | * Console Termios output entry point when using interrupt driven output. |
---|
832 | */ |
---|
833 | |
---|
834 | static int mc68681_write_support_int( |
---|
835 | int minor, |
---|
836 | const char *buf, |
---|
837 | int len |
---|
838 | ) |
---|
839 | { |
---|
840 | int i; |
---|
841 | unsigned32 Irql; |
---|
842 | |
---|
843 | for(i=0 ; i<len ;) { |
---|
844 | if(Ring_buffer_Is_full(&Console_Port_Data[minor].TxBuffer)) { |
---|
845 | if(!Console_Port_Data[minor].bActive) { |
---|
846 | /* |
---|
847 | * Wake up the device |
---|
848 | */ |
---|
849 | rtems_interrupt_disable(Irql); |
---|
850 | Console_Port_Data[minor].bActive = TRUE; |
---|
851 | if(Console_Port_Tbl[minor].pDeviceFlow != &mc68681_flow_RTSCTS) { |
---|
852 | mc68681_assert_RTS(minor); |
---|
853 | } |
---|
854 | mc68681_process(minor); |
---|
855 | rtems_interrupt_enable(Irql); |
---|
856 | } else { |
---|
857 | /* |
---|
858 | * Yield |
---|
859 | */ |
---|
860 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
---|
861 | } |
---|
862 | |
---|
863 | /* |
---|
864 | * Wait for ring buffer to empty |
---|
865 | */ |
---|
866 | continue; |
---|
867 | } |
---|
868 | else { |
---|
869 | Ring_buffer_Add_character( &Console_Port_Data[minor].TxBuffer, buf[i]); |
---|
870 | i++; |
---|
871 | } |
---|
872 | } |
---|
873 | |
---|
874 | /* |
---|
875 | * Ensure that characters are on the way |
---|
876 | */ |
---|
877 | |
---|
878 | if(!Console_Port_Data[minor].bActive) { |
---|
879 | /* |
---|
880 | * Wake up the device |
---|
881 | */ |
---|
882 | rtems_interrupt_disable(Irql); |
---|
883 | Console_Port_Data[minor].bActive = TRUE; |
---|
884 | if(Console_Port_Tbl[minor].pDeviceFlow != &mc68681_flow_RTSCTS) { |
---|
885 | mc68681_assert_RTS(minor); |
---|
886 | } |
---|
887 | mc68681_process(minor); |
---|
888 | rtems_interrupt_enable(Irql); |
---|
889 | } |
---|
890 | |
---|
891 | return (len); |
---|
892 | } |
---|
893 | |
---|
894 | /* |
---|
895 | * mc68681_write_support_polled |
---|
896 | * |
---|
897 | * Console Termios output entry point when using polled output. |
---|
898 | * |
---|
899 | */ |
---|
900 | |
---|
901 | static int mc68681_write_support_polled( |
---|
902 | int minor, |
---|
903 | const char *buf, |
---|
904 | int len |
---|
905 | ) |
---|
906 | { |
---|
907 | int nwrite = 0; |
---|
908 | |
---|
909 | /* |
---|
910 | * poll each byte in the string out of the port. |
---|
911 | */ |
---|
912 | while (nwrite < len) { |
---|
913 | /* |
---|
914 | * transmit character |
---|
915 | */ |
---|
916 | mc68681_write_polled(minor, *buf++); |
---|
917 | nwrite++; |
---|
918 | } |
---|
919 | |
---|
920 | /* |
---|
921 | * return the number of bytes written. |
---|
922 | */ |
---|
923 | return nwrite; |
---|
924 | } |
---|
925 | |
---|
926 | /* |
---|
927 | * mc68681_inbyte_nonblocking_polled |
---|
928 | * |
---|
929 | * Console Termios polling input entry point. |
---|
930 | */ |
---|
931 | |
---|
932 | static int mc68681_inbyte_nonblocking_polled( |
---|
933 | int minor |
---|
934 | ) |
---|
935 | { |
---|
936 | unsigned32 pMC68681_port; |
---|
937 | unsigned char ucLineStatus; |
---|
938 | char cChar; |
---|
939 | getRegister_f getReg; |
---|
940 | |
---|
941 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
---|
942 | getReg = Console_Port_Tbl[minor].getRegister; |
---|
943 | |
---|
944 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
---|
945 | if(ucLineStatus & MC68681_RX_READY) { |
---|
946 | cChar = (*getReg)(pMC68681_port, MC68681_RX_BUFFER); |
---|
947 | return (int)cChar; |
---|
948 | } else { |
---|
949 | return -1; |
---|
950 | } |
---|
951 | } |
---|