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) 1989-1999. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | * |
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16 | * $Id$ |
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17 | */ |
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18 | |
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19 | #include <rtems.h> |
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20 | #include <rtems/libio.h> |
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21 | #include <stdlib.h> |
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22 | |
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23 | #include <libchip/serial.h> |
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24 | #include <libchip/mc68681.h> |
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25 | #include <libchip/sersupp.h> |
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26 | #include "mc68681_p.h" |
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27 | |
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28 | /* |
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29 | * Flow control is only supported when using interrupts |
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30 | */ |
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31 | |
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32 | console_fns mc68681_fns = |
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33 | { |
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34 | libchip_serial_default_probe, /* deviceProbe */ |
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35 | mc68681_open, /* deviceFirstOpen */ |
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36 | NULL, /* deviceLastClose */ |
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37 | NULL, /* deviceRead */ |
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38 | mc68681_write_support_int, /* deviceWrite */ |
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39 | mc68681_initialize_interrupts, /* deviceInitialize */ |
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40 | mc68681_write_polled, /* deviceWritePolled */ |
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41 | mc68681_set_attributes, /* deviceSetAttributes */ |
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42 | true /* deviceOutputUsesInterrupts */ |
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43 | }; |
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44 | |
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45 | console_fns mc68681_fns_polled = |
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46 | { |
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47 | libchip_serial_default_probe, /* deviceProbe */ |
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48 | mc68681_open, /* deviceFirstOpen */ |
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49 | mc68681_close, /* deviceLastClose */ |
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50 | mc68681_inbyte_nonblocking_polled, /* deviceRead */ |
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51 | mc68681_write_support_polled, /* deviceWrite */ |
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52 | mc68681_init, /* 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 | extern void set_vector( rtems_isr_entry, rtems_vector_number, int ); |
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59 | |
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60 | /* |
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61 | * Console Device Driver Entry Points |
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62 | */ |
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63 | |
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64 | /* |
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65 | * mc68681_baud_rate |
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66 | * |
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67 | * This routine returns the proper ACR bit and baud rate field values |
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68 | * based on the requested baud rate. The baud rate set to be used |
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69 | * must be configured by the user. |
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70 | */ |
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71 | |
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72 | MC68681_STATIC int mc68681_baud_rate( |
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73 | int minor, |
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74 | int baud, |
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75 | unsigned int *baud_mask_p, |
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76 | unsigned int *acr_bit_p, |
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77 | unsigned int *command |
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78 | ); |
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79 | |
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80 | /* |
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81 | * mc68681_set_attributes |
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82 | * |
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83 | * This function sets the DUART channel to reflect the requested termios |
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84 | * port settings. |
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85 | */ |
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86 | |
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87 | MC68681_STATIC int mc68681_set_attributes( |
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88 | int minor, |
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89 | const struct termios *t |
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90 | ) |
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91 | { |
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92 | uint32_t pMC68681_port; |
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93 | uint32_t pMC68681; |
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94 | unsigned int mode1; |
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95 | unsigned int mode2; |
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96 | unsigned int baud_mask; |
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97 | unsigned int acr_bit; |
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98 | unsigned int cmd = 0; |
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99 | setRegister_f setReg; |
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100 | rtems_interrupt_level Irql; |
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101 | |
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102 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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103 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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104 | setReg = Console_Port_Tbl[minor].setRegister; |
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105 | |
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106 | /* |
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107 | * Set the baud rate |
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108 | */ |
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109 | |
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110 | if (mc68681_baud_rate( minor, t->c_cflag, &baud_mask, &acr_bit, &cmd ) == -1) |
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111 | return -1; |
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112 | |
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113 | baud_mask |= baud_mask << 4; |
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114 | acr_bit <<= 7; |
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115 | |
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116 | /* |
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117 | * Parity |
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118 | */ |
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119 | |
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120 | mode1 = 0; |
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121 | mode2 = 0; |
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122 | |
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123 | if (t->c_cflag & PARENB) { |
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124 | if (t->c_cflag & PARODD) |
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125 | mode1 |= 0x04; |
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126 | /* else |
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127 | mode1 |= 0x04; */ |
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128 | } else { |
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129 | mode1 |= 0x10; |
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130 | } |
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131 | |
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132 | /* |
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133 | * Character Size |
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134 | */ |
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135 | |
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136 | if (t->c_cflag & CSIZE) { |
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137 | switch (t->c_cflag & CSIZE) { |
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138 | case CS5: break; |
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139 | case CS6: mode1 |= 0x01; break; |
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140 | case CS7: mode1 |= 0x02; break; |
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141 | case CS8: mode1 |= 0x03; break; |
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142 | } |
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143 | } else { |
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144 | mode1 |= 0x03; /* default to 9600,8,N,1 */ |
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145 | } |
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146 | |
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147 | /* |
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148 | * Stop Bits |
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149 | */ |
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150 | |
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151 | if (t->c_cflag & CSTOPB) { |
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152 | mode2 |= 0x0F; /* 2 stop bits */ |
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153 | } else { |
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154 | if ((t->c_cflag & CSIZE) == CS5) /* CS5 and 1 stop bits not supported */ |
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155 | return -1; |
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156 | mode2 |= 0x07; /* 1 stop bit */ |
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157 | } |
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158 | |
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159 | /* |
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160 | * Hardware Flow Control |
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161 | */ |
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162 | |
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163 | if(t->c_cflag & CRTSCTS) { |
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164 | mode1 |= 0x80; /* Enable Rx RTS Control */ |
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165 | mode2 |= 0x10; /* Enable CTS Enable Tx */ |
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166 | } |
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167 | |
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168 | |
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169 | rtems_interrupt_disable(Irql); |
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170 | (*setReg)( pMC68681, MC68681_AUX_CTRL_REG, acr_bit ); |
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171 | (*setReg)( pMC68681_port, MC68681_CLOCK_SELECT, baud_mask ); |
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172 | if ( cmd ) { |
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173 | (*setReg)( pMC68681_port, MC68681_COMMAND, cmd ); /* RX */ |
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174 | (*setReg)( pMC68681_port, MC68681_COMMAND, cmd | 0x20 ); /* TX */ |
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175 | } |
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176 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_MR_PTR ); |
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177 | (*setReg)( pMC68681_port, MC68681_MODE, mode1 ); |
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178 | (*setReg)( pMC68681_port, MC68681_MODE, mode2 ); |
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179 | rtems_interrupt_enable(Irql); |
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180 | return 0; |
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181 | } |
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182 | |
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183 | /* |
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184 | * mc68681_initialize_context |
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185 | * |
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186 | * This function sets the default values of the per port context structure. |
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187 | */ |
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188 | |
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189 | MC68681_STATIC void mc68681_initialize_context( |
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190 | int minor, |
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191 | mc68681_context *pmc68681Context |
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192 | ) |
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193 | { |
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194 | int port; |
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195 | unsigned int pMC68681; |
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196 | unsigned int pMC68681_port; |
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197 | |
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198 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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199 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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200 | |
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201 | pmc68681Context->mate = -1; |
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202 | |
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203 | for (port=0 ; port<Console_Port_Count ; port++ ) { |
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204 | if ( Console_Port_Tbl[port].ulCtrlPort1 == pMC68681 && |
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205 | Console_Port_Tbl[port].ulCtrlPort2 != pMC68681_port ) { |
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206 | pmc68681Context->mate = port; |
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207 | pmc68681Context->imr = 0; |
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208 | break; |
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209 | } |
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210 | } |
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211 | |
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212 | } |
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213 | |
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214 | /* |
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215 | * mc68681_init |
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216 | * |
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217 | * This function initializes the DUART to a quiecsent state. |
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218 | */ |
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219 | |
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220 | MC68681_STATIC void mc68681_init(int minor) |
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221 | { |
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222 | uint32_t pMC68681_port; |
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223 | uint32_t pMC68681; |
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224 | mc68681_context *pmc68681Context; |
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225 | setRegister_f setReg; |
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226 | getRegister_f getReg; |
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227 | |
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228 | pmc68681Context = (mc68681_context *) malloc(sizeof(mc68681_context)); |
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229 | |
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230 | Console_Port_Data[minor].pDeviceContext = (void *)pmc68681Context; |
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231 | |
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232 | mc68681_initialize_context( minor, pmc68681Context ); |
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233 | |
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234 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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235 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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236 | setReg = Console_Port_Tbl[minor].setRegister; |
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237 | getReg = Console_Port_Tbl[minor].getRegister; |
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238 | |
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239 | /* |
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240 | * Reset everything and leave this port disabled. |
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241 | */ |
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242 | |
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243 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_RX ); |
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244 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_TX ); |
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245 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_ERROR ); |
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246 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_BREAK ); |
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247 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_STOP_BREAK ); |
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248 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_TX ); |
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249 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_RX ); |
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250 | |
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251 | |
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252 | (*setReg)( pMC68681_port, MC68681_MODE_REG_1A, 0x00 ); |
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253 | (*setReg)( pMC68681_port, MC68681_MODE_REG_2A, 0x02 ); |
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254 | |
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255 | /* |
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256 | * Disable interrupts on RX and TX for this port |
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257 | */ |
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258 | |
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259 | mc68681_enable_interrupts( minor, MC68681_IMR_DISABLE_ALL ); |
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260 | } |
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261 | |
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262 | /* |
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263 | * mc68681_open |
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264 | * |
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265 | * This function opens a port for communication. |
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266 | * |
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267 | * Default state is 9600 baud, 8 bits, No parity, and 1 stop bit. |
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268 | */ |
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269 | |
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270 | MC68681_STATIC int mc68681_open( |
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271 | int major, |
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272 | int minor, |
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273 | void *arg |
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274 | ) |
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275 | { |
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276 | uint32_t pMC68681; |
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277 | uint32_t pMC68681_port; |
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278 | unsigned int baud; |
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279 | unsigned int acr_bit; |
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280 | unsigned int vector; |
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281 | unsigned int command = 0; |
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282 | rtems_interrupt_level Irql; |
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283 | setRegister_f setReg; |
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284 | unsigned int status; |
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285 | |
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286 | |
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287 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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288 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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289 | setReg = Console_Port_Tbl[minor].setRegister; |
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290 | vector = Console_Port_Tbl[minor].ulIntVector; |
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291 | |
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292 | /* XXX default baud rate should be from configuration table */ |
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293 | |
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294 | status = mc68681_baud_rate( minor, B9600, &baud, &acr_bit, &command ); |
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295 | if (status < 0) rtems_fatal_error_occurred (RTEMS_NOT_DEFINED); |
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296 | |
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297 | /* |
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298 | * Set the DUART channel to a default useable state |
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299 | */ |
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300 | |
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301 | rtems_interrupt_disable(Irql); |
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302 | (*setReg)( pMC68681, MC68681_AUX_CTRL_REG, acr_bit << 7 ); |
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303 | (*setReg)( pMC68681_port, MC68681_CLOCK_SELECT, baud ); |
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304 | if ( command ) { |
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305 | (*setReg)( pMC68681_port, MC68681_COMMAND, command ); /* RX */ |
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306 | (*setReg)( pMC68681_port, MC68681_COMMAND, command | 0x20 ); /* TX */ |
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307 | } |
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308 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_MR_PTR ); |
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309 | (*setReg)( pMC68681_port, MC68681_MODE, 0x13 ); |
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310 | (*setReg)( pMC68681_port, MC68681_MODE, 0x07 ); |
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311 | rtems_interrupt_enable(Irql); |
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312 | |
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313 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_ENABLE_TX ); |
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314 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_ENABLE_RX ); |
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315 | |
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316 | (*setReg)( pMC68681, MC68681_INTERRUPT_VECTOR_REG, vector ); |
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317 | |
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318 | return RTEMS_SUCCESSFUL; |
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319 | } |
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320 | |
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321 | /* |
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322 | * mc68681_close |
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323 | * |
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324 | * This function shuts down the requested port. |
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325 | */ |
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326 | |
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327 | MC68681_STATIC int mc68681_close( |
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328 | int major, |
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329 | int minor, |
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330 | void *arg |
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331 | ) |
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332 | { |
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333 | uint32_t pMC68681; |
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334 | uint32_t pMC68681_port; |
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335 | setRegister_f setReg; |
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336 | |
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337 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
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338 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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339 | setReg = Console_Port_Tbl[minor].setRegister; |
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340 | |
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341 | /* |
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342 | * Disable interrupts from this channel and then disable it totally. |
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343 | */ |
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344 | |
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345 | #if 0 |
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346 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_TX ); |
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347 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_RX ); |
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348 | #endif |
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349 | |
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350 | return(RTEMS_SUCCESSFUL); |
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351 | } |
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352 | |
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353 | /* |
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354 | * mc68681_write_polled |
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355 | * |
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356 | * This routine polls out the requested character. |
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357 | */ |
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358 | |
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359 | MC68681_STATIC void mc68681_write_polled( |
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360 | int minor, |
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361 | char cChar |
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362 | ) |
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363 | { |
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364 | uint32_t pMC68681_port; |
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365 | unsigned char ucLineStatus; |
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366 | int iTimeout; |
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367 | getRegister_f getReg; |
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368 | setRegister_f setReg; |
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369 | |
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370 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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371 | getReg = Console_Port_Tbl[minor].getRegister; |
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372 | setReg = Console_Port_Tbl[minor].setRegister; |
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373 | |
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374 | /* |
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375 | * wait for transmitter holding register to be empty |
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376 | */ |
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377 | iTimeout = 1000; |
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378 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
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379 | while ((ucLineStatus & (MC68681_TX_READY|MC68681_TX_EMPTY)) == 0) { |
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380 | |
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381 | if ((ucLineStatus & 0xF0)) |
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382 | (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_ERROR ); |
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383 | |
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384 | /* |
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385 | * Yield while we wait |
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386 | */ |
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387 | |
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388 | #if 0 |
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389 | if(_System_state_Is_up(_System_state_Get())) { |
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390 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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391 | } |
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392 | #endif |
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393 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
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394 | if(!--iTimeout) { |
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395 | break; |
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396 | } |
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397 | } |
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398 | |
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399 | /* |
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400 | * transmit character |
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401 | */ |
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402 | |
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403 | (*setReg)(pMC68681_port, MC68681_TX_BUFFER, cChar); |
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404 | } |
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405 | |
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406 | /* |
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407 | * mc68681_isr |
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408 | * |
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409 | * This is the single interrupt entry point which parcels interrupts |
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410 | * out to the various ports. |
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411 | */ |
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412 | |
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413 | MC68681_STATIC rtems_isr mc68681_isr( |
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414 | rtems_vector_number vector |
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415 | ) |
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416 | { |
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417 | int minor; |
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418 | |
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419 | for(minor=0 ; minor<Console_Port_Count ; minor++) { |
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420 | if(Console_Port_Tbl[minor].ulIntVector == vector && |
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421 | Console_Port_Tbl[minor].deviceType == SERIAL_MC68681 ) { |
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422 | mc68681_process(minor); |
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423 | } |
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424 | } |
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425 | } |
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426 | |
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427 | /* |
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428 | * mc68681_initialize_interrupts |
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429 | * |
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430 | * This routine initializes the console's receive and transmit |
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431 | * ring buffers and loads the appropriate vectors to handle the interrupts. |
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432 | */ |
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433 | |
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434 | MC68681_STATIC void mc68681_initialize_interrupts(int minor) |
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435 | { |
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436 | mc68681_init(minor); |
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437 | |
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438 | Console_Port_Data[minor].bActive = FALSE; |
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439 | |
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440 | set_vector(mc68681_isr, Console_Port_Tbl[minor].ulIntVector, 1); |
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441 | |
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442 | mc68681_enable_interrupts(minor,MC68681_IMR_ENABLE_ALL_EXCEPT_TX); |
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443 | } |
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444 | |
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445 | /* |
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446 | * mc68681_write_support_int |
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447 | * |
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448 | * Console Termios output entry point when using interrupt driven output. |
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449 | */ |
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450 | |
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451 | MC68681_STATIC int mc68681_write_support_int( |
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452 | int minor, |
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453 | const char *buf, |
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454 | int len |
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455 | ) |
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456 | { |
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457 | uint32_t Irql; |
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458 | uint32_t pMC68681_port; |
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459 | setRegister_f setReg; |
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460 | |
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461 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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462 | setReg = Console_Port_Tbl[minor].setRegister; |
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463 | |
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464 | /* |
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465 | * We are using interrupt driven output and termios only sends us |
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466 | * one character at a time. |
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467 | */ |
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468 | |
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469 | if ( !len ) |
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470 | return 0; |
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471 | |
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472 | /* |
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473 | * Put the character out and enable interrupts if necessary. |
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474 | */ |
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475 | |
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476 | rtems_interrupt_disable(Irql); |
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477 | if ( Console_Port_Data[minor].bActive == FALSE ) { |
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478 | Console_Port_Data[minor].bActive = TRUE; |
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479 | mc68681_enable_interrupts(minor, MC68681_IMR_ENABLE_ALL); |
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480 | } |
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481 | (*setReg)(pMC68681_port, MC68681_TX_BUFFER, *buf); |
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482 | rtems_interrupt_enable(Irql); |
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483 | |
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484 | return 1; |
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485 | } |
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486 | |
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487 | /* |
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488 | * mc68681_write_support_polled |
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489 | * |
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490 | * Console Termios output entry point when using polled output. |
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491 | * |
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492 | */ |
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493 | |
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494 | MC68681_STATIC int mc68681_write_support_polled( |
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495 | int minor, |
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496 | const char *buf, |
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497 | int len |
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498 | ) |
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499 | { |
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500 | int nwrite = 0; |
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501 | |
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502 | /* |
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503 | * poll each byte in the string out of the port. |
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504 | */ |
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505 | while (nwrite < len) { |
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506 | /* |
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507 | * transmit character |
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508 | */ |
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509 | mc68681_write_polled(minor, *buf++); |
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510 | nwrite++; |
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511 | } |
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512 | |
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513 | /* |
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514 | * return the number of bytes written. |
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515 | */ |
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516 | return nwrite; |
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517 | } |
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518 | |
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519 | /* |
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520 | * mc68681_inbyte_nonblocking_polled |
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521 | * |
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522 | * Console Termios polling input entry point. |
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523 | */ |
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524 | |
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525 | MC68681_STATIC int mc68681_inbyte_nonblocking_polled( |
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526 | int minor |
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527 | ) |
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528 | { |
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529 | uint32_t pMC68681_port; |
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530 | unsigned char ucLineStatus; |
---|
531 | unsigned char cChar; |
---|
532 | getRegister_f getReg; |
---|
533 | |
---|
534 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
---|
535 | getReg = Console_Port_Tbl[minor].getRegister; |
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536 | |
---|
537 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
---|
538 | if(ucLineStatus & MC68681_RX_READY) { |
---|
539 | cChar = (*getReg)(pMC68681_port, MC68681_RX_BUFFER); |
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540 | return (int)cChar; |
---|
541 | } else { |
---|
542 | return -1; |
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543 | } |
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544 | } |
---|
545 | |
---|
546 | /* |
---|
547 | * mc68681_baud_rate |
---|
548 | */ |
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549 | |
---|
550 | MC68681_STATIC int mc68681_baud_rate( |
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551 | int minor, |
---|
552 | int baud, |
---|
553 | unsigned int *baud_mask_p, |
---|
554 | unsigned int *acr_bit_p, |
---|
555 | unsigned int *command |
---|
556 | ) |
---|
557 | { |
---|
558 | unsigned int baud_mask; |
---|
559 | unsigned int acr_bit; |
---|
560 | int status; |
---|
561 | int is_extended; |
---|
562 | int baud_requested; |
---|
563 | mc68681_baud_table_t *baud_tbl; |
---|
564 | |
---|
565 | baud_mask = 0; |
---|
566 | acr_bit = 0; |
---|
567 | status = 0; |
---|
568 | |
---|
569 | if (Console_Port_Tbl[minor].ulDataPort & MC68681_DATA_BAUD_RATE_SET_2) |
---|
570 | { |
---|
571 | acr_bit = 1; |
---|
572 | } |
---|
573 | |
---|
574 | is_extended = 0; |
---|
575 | |
---|
576 | switch (Console_Port_Tbl[minor].ulDataPort & MC68681_XBRG_MASK) { |
---|
577 | case MC68681_XBRG_IGNORED: |
---|
578 | *command = 0x00; |
---|
579 | break; |
---|
580 | case MC68681_XBRG_ENABLED: |
---|
581 | *command = 0x80; |
---|
582 | is_extended = 1; |
---|
583 | break; |
---|
584 | case MC68681_XBRG_DISABLED: |
---|
585 | *command = 0x90; |
---|
586 | break; |
---|
587 | } |
---|
588 | |
---|
589 | baud_requested = baud & CBAUD; |
---|
590 | if (!baud_requested) |
---|
591 | baud_requested = B9600; /* default to 9600 baud */ |
---|
592 | |
---|
593 | baud_requested = rtems_termios_baud_to_index( baud_requested ); |
---|
594 | |
---|
595 | baud_tbl = (mc68681_baud_table_t *) Console_Port_Tbl[minor].ulClock; |
---|
596 | if (!baud_tbl) |
---|
597 | rtems_fatal_error_occurred(RTEMS_INVALID_ADDRESS); |
---|
598 | |
---|
599 | if ( is_extended ) |
---|
600 | baud_mask = (unsigned int)baud_tbl[ acr_bit + 2 ][ baud_requested ]; |
---|
601 | else |
---|
602 | baud_mask = baud_tbl[ acr_bit ][ baud_requested ]; |
---|
603 | |
---|
604 | if ( baud_mask == MC68681_BAUD_NOT_VALID ) |
---|
605 | status = -1; |
---|
606 | |
---|
607 | /* |
---|
608 | * upper nibble is receiver and lower nibble is transmitter |
---|
609 | */ |
---|
610 | |
---|
611 | *baud_mask_p = (baud_mask << 4) | baud_mask; |
---|
612 | *acr_bit_p = acr_bit; |
---|
613 | return status; |
---|
614 | } |
---|
615 | |
---|
616 | /* |
---|
617 | * mc68681_process |
---|
618 | * |
---|
619 | * This routine is the per port console interrupt handler. |
---|
620 | */ |
---|
621 | |
---|
622 | MC68681_STATIC void mc68681_process( |
---|
623 | int minor |
---|
624 | ) |
---|
625 | { |
---|
626 | uint32_t pMC68681; |
---|
627 | uint32_t pMC68681_port; |
---|
628 | volatile uint8_t ucLineStatus; |
---|
629 | volatile uint8_t ucISRStatus; |
---|
630 | char cChar; |
---|
631 | getRegister_f getReg; |
---|
632 | setRegister_f setReg; |
---|
633 | |
---|
634 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
635 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
---|
636 | getReg = Console_Port_Tbl[minor].getRegister; |
---|
637 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
638 | |
---|
639 | /* Get ISR at the beginning of the IT routine */ |
---|
640 | ucISRStatus = (*getReg)(pMC68681, MC68681_INTERRUPT_STATUS_REG); |
---|
641 | |
---|
642 | /* Get good ISR a or b channel */ |
---|
643 | if (pMC68681 != pMC68681_port){ |
---|
644 | ucISRStatus >>= 4; |
---|
645 | } |
---|
646 | |
---|
647 | /* See if is usefull to call rtems_termios_dequeue */ |
---|
648 | if(Console_Port_Data[minor].bActive == FALSE) { |
---|
649 | ucISRStatus = ucISRStatus & ~MC68681_IR_TX_READY; |
---|
650 | } |
---|
651 | |
---|
652 | /* |
---|
653 | * Deal with any received characters |
---|
654 | */ |
---|
655 | while(true) { |
---|
656 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
---|
657 | if(!(ucLineStatus & MC68681_RX_READY)) { |
---|
658 | break; |
---|
659 | } |
---|
660 | /* |
---|
661 | * If there is a RX error, then dump all the data. |
---|
662 | */ |
---|
663 | if ( ucLineStatus & MC68681_RX_ERRORS ) { |
---|
664 | do { |
---|
665 | cChar = (*getReg)(pMC68681_port, MC68681_RX_BUFFER); |
---|
666 | ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS); |
---|
667 | } while ( ucLineStatus & MC68681_RX_READY ); |
---|
668 | continue; |
---|
669 | } |
---|
670 | cChar = (*getReg)(pMC68681_port, MC68681_RX_BUFFER); |
---|
671 | rtems_termios_enqueue_raw_characters( |
---|
672 | Console_Port_Data[minor].termios_data, |
---|
673 | &cChar, |
---|
674 | 1 |
---|
675 | ); |
---|
676 | } |
---|
677 | |
---|
678 | /* |
---|
679 | * Deal with the transmitter |
---|
680 | */ |
---|
681 | |
---|
682 | if (ucISRStatus & MC68681_IR_TX_READY) { |
---|
683 | if (!rtems_termios_dequeue_characters( |
---|
684 | Console_Port_Data[minor].termios_data, 1)) { |
---|
685 | /* If no more char to send, disable TX interrupt */ |
---|
686 | Console_Port_Data[minor].bActive = FALSE; |
---|
687 | mc68681_enable_interrupts(minor, MC68681_IMR_ENABLE_ALL_EXCEPT_TX); |
---|
688 | } |
---|
689 | } |
---|
690 | } |
---|
691 | |
---|
692 | /* |
---|
693 | * mc68681_build_imr |
---|
694 | * |
---|
695 | * This function returns the value for the interrupt mask register for this |
---|
696 | * DUART. Since this is a shared register, we must look at the other port |
---|
697 | * on this chip to determine whether or not it is using interrupts. |
---|
698 | */ |
---|
699 | |
---|
700 | MC68681_STATIC unsigned int mc68681_build_imr( |
---|
701 | int minor, |
---|
702 | int enable_flag |
---|
703 | ) |
---|
704 | { |
---|
705 | int mate; |
---|
706 | int is_a; |
---|
707 | unsigned int mask; |
---|
708 | unsigned int mate_mask; |
---|
709 | unsigned int pMC68681; |
---|
710 | unsigned int pMC68681_port; |
---|
711 | mc68681_context *pmc68681Context; |
---|
712 | mc68681_context *mateContext; |
---|
713 | |
---|
714 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
715 | pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2; |
---|
716 | pmc68681Context = (mc68681_context *) Console_Port_Data[minor].pDeviceContext; |
---|
717 | mate = pmc68681Context->mate; |
---|
718 | |
---|
719 | mask = 0; |
---|
720 | mate_mask = 0; |
---|
721 | |
---|
722 | is_a = (pMC68681 == pMC68681_port); |
---|
723 | |
---|
724 | /* |
---|
725 | * If there is a mate for this port, get its IMR mask. |
---|
726 | */ |
---|
727 | |
---|
728 | if ( mate != -1 ) { |
---|
729 | mateContext = Console_Port_Data[mate].pDeviceContext; |
---|
730 | |
---|
731 | if (mateContext) |
---|
732 | mate_mask = mateContext->imr; |
---|
733 | } |
---|
734 | |
---|
735 | /* |
---|
736 | * Calculate this port's IMR mask and save it in the context area. |
---|
737 | */ |
---|
738 | |
---|
739 | if ( Console_Port_Tbl[minor].pDeviceFns->deviceOutputUsesInterrupts ) |
---|
740 | mask = enable_flag; |
---|
741 | |
---|
742 | pmc68681Context->imr = mask; |
---|
743 | |
---|
744 | /* |
---|
745 | * Now return the full IMR value |
---|
746 | */ |
---|
747 | |
---|
748 | if (is_a) |
---|
749 | return (mate_mask << 4) | mask; |
---|
750 | |
---|
751 | return (mask << 4) | mate_mask; |
---|
752 | } |
---|
753 | |
---|
754 | /* |
---|
755 | * mc68681_enable_interrupts |
---|
756 | * |
---|
757 | * This function enables specific interrupt sources on the DUART. |
---|
758 | */ |
---|
759 | |
---|
760 | MC68681_STATIC void mc68681_enable_interrupts( |
---|
761 | int minor, |
---|
762 | int imr_mask |
---|
763 | ) |
---|
764 | { |
---|
765 | uint32_t pMC68681; |
---|
766 | setRegister_f setReg; |
---|
767 | |
---|
768 | pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
769 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
770 | |
---|
771 | /* |
---|
772 | * Enable interrupts on RX and TX -- not break |
---|
773 | */ |
---|
774 | |
---|
775 | (*setReg)( |
---|
776 | pMC68681, |
---|
777 | MC68681_INTERRUPT_MASK_REG, |
---|
778 | mc68681_build_imr(minor, imr_mask) |
---|
779 | ); |
---|
780 | } |
---|