1 | /* |
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2 | * This file contains the termios TTY driver for the UART found |
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3 | * on the Synova Mongoose-V. |
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4 | * |
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5 | * COPYRIGHT (c) 1989-2001. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.rtems.com/license/LICENSE. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include <rtems.h> |
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16 | #include <rtems/libio.h> |
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17 | #include <stdlib.h> |
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18 | |
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19 | #include <libchip/serial.h> |
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20 | #include <libchip/mg5uart.h> |
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21 | #include <libchip/sersupp.h> |
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22 | #include <libcpu/mongoose-v.h> |
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23 | |
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24 | extern void set_vector( rtems_isr_entry, rtems_vector_number, int ); |
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25 | |
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26 | /* |
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27 | * Indices of registers |
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28 | */ |
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29 | |
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30 | /* |
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31 | * Per chip context control |
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32 | */ |
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33 | |
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34 | typedef struct _mg5uart_context |
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35 | { |
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36 | int mate; |
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37 | } mg5uart_context; |
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38 | |
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39 | /* |
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40 | * Define MG5UART_STATIC to nothing while debugging so the entry points |
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41 | * will show up in the symbol table. |
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42 | */ |
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43 | |
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44 | #define MG5UART_STATIC |
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45 | |
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46 | /* #define MG5UART_STATIC static */ |
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47 | |
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48 | |
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49 | |
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50 | #define MG5UART_SETREG( _base, _register, _value ) \ |
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51 | MONGOOSEV_WRITE_REGISTER( _base, _register, _value ) |
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52 | |
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53 | #define MG5UART_GETREG( _base, _register ) \ |
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54 | MONGOOSEV_READ_REGISTER( _base, _register ) |
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55 | |
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56 | |
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57 | /* |
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58 | * Console Device Driver Support Functions |
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59 | */ |
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60 | |
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61 | MG5UART_STATIC int mg5uart_baud_rate( |
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62 | int minor, |
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63 | uint32_t baud, |
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64 | uint32_t *code |
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65 | ); |
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66 | |
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67 | MG5UART_STATIC void mg5uart_enable_interrupts( |
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68 | int minor, |
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69 | int mask |
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70 | ); |
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71 | |
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72 | /* |
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73 | * mg5uart_set_attributes |
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74 | * |
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75 | * This function sets the UART channel to reflect the requested termios |
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76 | * port settings. |
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77 | */ |
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78 | |
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79 | MG5UART_STATIC int mg5uart_set_attributes( |
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80 | int minor, |
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81 | const struct termios *t |
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82 | ) |
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83 | { |
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84 | uint32_t pMG5UART_port; |
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85 | uint32_t pMG5UART; |
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86 | uint32_t cmd, cmdSave; |
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87 | uint32_t baudcmd; |
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88 | uint32_t shift; |
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89 | rtems_interrupt_level Irql; |
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90 | |
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91 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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92 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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93 | |
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94 | /* |
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95 | * Set the baud rate |
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96 | */ |
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97 | |
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98 | if (mg5uart_baud_rate( minor, t->c_cflag, &baudcmd ) == -1) |
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99 | return -1; |
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100 | |
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101 | /* |
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102 | * Base settings |
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103 | */ |
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104 | |
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105 | /* |
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106 | * Base settings |
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107 | */ |
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108 | |
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109 | cmd = MONGOOSEV_UART_CMD_RX_ENABLE | MONGOOSEV_UART_CMD_TX_ENABLE; |
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110 | |
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111 | /* |
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112 | * Parity |
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113 | */ |
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114 | |
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115 | if (t->c_cflag & PARENB) { |
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116 | cmd |= MONGOOSEV_UART_CMD_PARITY_ENABLE; |
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117 | if (t->c_cflag & PARODD) |
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118 | cmd |= MONGOOSEV_UART_CMD_PARITY_ODD; |
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119 | else |
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120 | cmd |= MONGOOSEV_UART_CMD_PARITY_EVEN; |
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121 | } else { |
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122 | cmd |= MONGOOSEV_UART_CMD_PARITY_DISABLE; |
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123 | } |
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124 | |
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125 | /* |
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126 | * Character Size |
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127 | */ |
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128 | |
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129 | if (t->c_cflag & CSIZE) { |
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130 | switch (t->c_cflag & CSIZE) { |
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131 | case CS5: |
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132 | case CS6: |
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133 | case CS7: |
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134 | return -1; |
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135 | break; |
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136 | case CS8: |
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137 | /* Mongoose-V only supports CS8 */ |
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138 | break; |
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139 | |
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140 | } |
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141 | } /* else default to CS8 */ |
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142 | |
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143 | /* |
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144 | * Stop Bits |
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145 | */ |
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146 | |
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147 | #if 0 |
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148 | if (t->c_cflag & CSTOPB) { |
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149 | /* 2 stop bits not supported by Mongoose-V uart */ |
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150 | return -1; |
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151 | } |
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152 | #endif |
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153 | |
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154 | /* |
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155 | * XXX what about CTS/RTS |
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156 | */ |
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157 | |
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158 | /* XXX */ |
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159 | |
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160 | /* |
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161 | * Now write the registers |
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162 | */ |
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163 | |
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164 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
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165 | shift = MONGOOSEV_UART0_CMD_SHIFT; |
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166 | else |
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167 | shift = MONGOOSEV_UART1_CMD_SHIFT; |
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168 | |
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169 | |
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170 | |
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171 | rtems_interrupt_disable(Irql); |
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172 | |
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173 | cmdSave = MG5UART_GETREG( pMG5UART, MG5UART_COMMAND_REGISTER ); |
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174 | |
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175 | MG5UART_SETREG( pMG5UART, |
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176 | MG5UART_COMMAND_REGISTER, |
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177 | (cmdSave & ~(MONGOOSEV_UART_ALL_STATUS_BITS << shift)) | (cmd << shift) ); |
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178 | |
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179 | MG5UART_SETREG( pMG5UART_port, MG5UART_BAUD_RATE, baudcmd ); |
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180 | |
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181 | rtems_interrupt_enable(Irql); |
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182 | return 0; |
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183 | } |
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184 | |
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185 | /* |
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186 | * mg5uart_initialize_context |
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187 | * |
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188 | * This function sets the default values of the per port context structure. |
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189 | */ |
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190 | |
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191 | MG5UART_STATIC void mg5uart_initialize_context( |
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192 | int minor, |
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193 | mg5uart_context *pmg5uartContext |
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194 | ) |
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195 | { |
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196 | int port; |
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197 | unsigned int pMG5UART; |
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198 | unsigned int pMG5UART_port; |
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199 | |
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200 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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201 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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202 | |
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203 | pmg5uartContext->mate = -1; |
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204 | |
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205 | for (port=0 ; port<Console_Port_Count ; port++ ) { |
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206 | if ( Console_Port_Tbl[port].ulCtrlPort1 == pMG5UART && |
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207 | Console_Port_Tbl[port].ulCtrlPort2 != pMG5UART_port ) { |
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208 | pmg5uartContext->mate = port; |
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209 | break; |
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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 | /* |
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216 | * mg5uart_init |
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217 | * |
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218 | * This function initializes the DUART to a quiecsent state. |
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219 | */ |
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220 | |
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221 | MG5UART_STATIC void mg5uart_init(int minor) |
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222 | { |
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223 | uint32_t pMG5UART_port; |
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224 | uint32_t pMG5UART; |
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225 | uint32_t cmdSave; |
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226 | uint32_t shift; |
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227 | |
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228 | mg5uart_context *pmg5uartContext; |
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229 | |
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230 | pmg5uartContext = (mg5uart_context *) malloc(sizeof(mg5uart_context)); |
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231 | |
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232 | Console_Port_Data[minor].pDeviceContext = (void *)pmg5uartContext; |
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233 | |
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234 | mg5uart_initialize_context( minor, pmg5uartContext ); |
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235 | |
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236 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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237 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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238 | |
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239 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
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240 | shift = MONGOOSEV_UART0_CMD_SHIFT; |
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241 | else |
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242 | shift = MONGOOSEV_UART1_CMD_SHIFT; |
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243 | |
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244 | /* |
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245 | * Disable the uart and leave this port disabled. |
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246 | */ |
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247 | |
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248 | cmdSave = MG5UART_GETREG(pMG5UART, MG5UART_COMMAND_REGISTER) & ~(MONGOOSEV_UART_ALL_STATUS_BITS << shift); |
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249 | |
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250 | MG5UART_SETREG( pMG5UART, MG5UART_COMMAND_REGISTER, cmdSave ); |
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251 | |
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252 | /* |
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253 | * Disable interrupts on RX and TX for this port |
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254 | */ |
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255 | mg5uart_enable_interrupts( minor, MG5UART_DISABLE_ALL ); |
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256 | } |
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257 | |
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258 | /* |
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259 | * mg5uart_open |
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260 | * |
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261 | * This function opens a port for communication. |
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262 | * |
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263 | * Default state is 9600 baud, 8 bits, No parity, and 1 stop bit. |
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264 | */ |
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265 | |
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266 | MG5UART_STATIC int mg5uart_open( |
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267 | int major, |
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268 | int minor, |
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269 | void *arg |
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270 | ) |
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271 | { |
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272 | uint32_t pMG5UART; |
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273 | uint32_t pMG5UART_port; |
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274 | uint32_t vector; |
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275 | uint32_t cmd, cmdSave; |
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276 | uint32_t baudcmd; |
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277 | uint32_t shift; |
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278 | |
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279 | rtems_interrupt_level Irql; |
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280 | |
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281 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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282 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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283 | vector = Console_Port_Tbl[minor].ulIntVector; |
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284 | |
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285 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
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286 | shift = MONGOOSEV_UART0_CMD_SHIFT; |
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287 | else |
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288 | shift = MONGOOSEV_UART1_CMD_SHIFT; |
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289 | |
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290 | |
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291 | /* XXX default baud rate could be from configuration table */ |
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292 | |
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293 | (void) mg5uart_baud_rate( minor, B19200, &baudcmd ); |
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294 | |
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295 | /* |
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296 | * Set the DUART channel to a default useable state |
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297 | * B19200, 8Nx since there is no stop bit control. |
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298 | */ |
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299 | |
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300 | cmd = MONGOOSEV_UART_CMD_TX_ENABLE | MONGOOSEV_UART_CMD_RX_ENABLE; |
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301 | |
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302 | rtems_interrupt_disable(Irql); |
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303 | |
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304 | cmdSave = MG5UART_GETREG( pMG5UART, MG5UART_COMMAND_REGISTER ); |
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305 | |
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306 | MG5UART_SETREG( pMG5UART_port, MG5UART_BAUD_RATE, baudcmd ); |
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307 | |
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308 | MG5UART_SETREG( pMG5UART, |
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309 | MG5UART_COMMAND_REGISTER, |
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310 | cmd = (cmdSave & ~(MONGOOSEV_UART_ALL_STATUS_BITS << shift)) | (cmd << shift) ); |
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311 | |
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312 | rtems_interrupt_enable(Irql); |
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313 | |
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314 | return RTEMS_SUCCESSFUL; |
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315 | } |
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316 | |
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317 | /* |
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318 | * mg5uart_close |
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319 | * |
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320 | * This function shuts down the requested port. |
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321 | */ |
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322 | |
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323 | MG5UART_STATIC int mg5uart_close( |
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324 | int major, |
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325 | int minor, |
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326 | void *arg |
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327 | ) |
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328 | { |
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329 | uint32_t pMG5UART; |
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330 | uint32_t pMG5UART_port; |
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331 | uint32_t cmd, cmdSave; |
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332 | uint32_t shift; |
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333 | rtems_interrupt_level Irql; |
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334 | |
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335 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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336 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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337 | |
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338 | /* |
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339 | * Disable interrupts from this channel and then disable it totally. |
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340 | */ |
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341 | |
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342 | /* XXX interrupts */ |
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343 | |
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344 | cmd = MONGOOSEV_UART_CMD_TX_DISABLE | MONGOOSEV_UART_CMD_RX_DISABLE; |
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345 | |
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346 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
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347 | shift = MONGOOSEV_UART0_CMD_SHIFT; |
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348 | else |
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349 | shift = MONGOOSEV_UART1_CMD_SHIFT; |
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350 | |
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351 | |
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352 | rtems_interrupt_disable(Irql); |
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353 | cmdSave = MG5UART_GETREG( pMG5UART, MG5UART_COMMAND_REGISTER ); |
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354 | |
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355 | MG5UART_SETREG( pMG5UART, |
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356 | MG5UART_COMMAND_REGISTER, |
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357 | (cmdSave & ~(MONGOOSEV_UART_ALL_STATUS_BITS << shift)) | (cmd << shift) ); |
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358 | rtems_interrupt_enable(Irql); |
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359 | |
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360 | return(RTEMS_SUCCESSFUL); |
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361 | } |
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362 | |
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363 | |
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364 | |
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365 | |
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366 | /* |
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367 | * mg5uart_write_polled |
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368 | * |
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369 | * This routine polls out the requested character. |
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370 | */ |
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371 | |
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372 | MG5UART_STATIC void mg5uart_write_polled( |
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373 | int minor, |
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374 | char c |
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375 | ) |
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376 | { |
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377 | uint32_t pMG5UART; |
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378 | uint32_t pMG5UART_port; |
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379 | uint32_t status; |
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380 | int shift; |
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381 | int timeout; |
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382 | |
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383 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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384 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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385 | |
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386 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
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387 | shift = MONGOOSEV_UART0_IRQ_SHIFT; |
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388 | else |
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389 | shift = MONGOOSEV_UART1_IRQ_SHIFT; |
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390 | |
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391 | /* |
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392 | * wait for transmitter holding register to be empty |
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393 | */ |
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394 | timeout = 2000; |
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395 | |
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396 | while( --timeout ) |
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397 | { |
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398 | status = MG5UART_GETREG(pMG5UART, MG5UART_STATUS_REGISTER) >> shift; |
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399 | |
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400 | /* |
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401 | if ( (status & (MONGOOSEV_UART_TX_READY | MONGOOSEV_UART_TX_EMPTY)) == |
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402 | (MONGOOSEV_UART_TX_READY | MONGOOSEV_UART_TX_EMPTY) ) |
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403 | break; |
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404 | */ |
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405 | |
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406 | if( (status & (MONGOOSEV_UART_TX_READY | MONGOOSEV_UART_TX_EMPTY)) ) |
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407 | break; |
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408 | |
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409 | /* |
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410 | * Yield while we wait |
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411 | */ |
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412 | |
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413 | #if 0 |
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414 | if(_System_state_Is_up(_System_state_Get())) |
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415 | { |
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416 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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417 | } |
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418 | #endif |
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419 | } |
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420 | |
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421 | /* |
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422 | * transmit character |
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423 | */ |
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424 | |
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425 | MG5UART_SETREG(pMG5UART_port, MG5UART_TX_BUFFER, c); |
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426 | } |
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427 | |
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428 | |
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429 | |
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430 | |
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431 | /* |
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432 | * mg5uart_isr_XXX |
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433 | * |
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434 | * This is the single interrupt entry point which parcels interrupts |
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435 | * out to the handlers for specific sources and makes sure that the |
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436 | * shared handler gets the right arguments. |
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437 | * |
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438 | * NOTE: Yes .. this is ugly but it provides 5 interrupt source |
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439 | * wrappers which are nearly functionally identical. |
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440 | */ |
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441 | |
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442 | |
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443 | #define __ISR(_TYPE, _OFFSET) \ |
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444 | MG5UART_STATIC void mg5uart_process_isr_ ## _TYPE ( \ |
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445 | int minor \ |
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446 | ); \ |
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447 | \ |
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448 | MG5UART_STATIC rtems_isr mg5uart_isr_ ## _TYPE ( \ |
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449 | rtems_vector_number vector \ |
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450 | ) \ |
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451 | { \ |
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452 | int minor; \ |
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453 | extern void mips_default_isr(int vector); \ |
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454 | \ |
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455 | for(minor=0 ; minor<Console_Port_Count ; minor++) { \ |
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456 | if( Console_Port_Tbl[minor].deviceType == SERIAL_MG5UART && \ |
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457 | vector == Console_Port_Tbl[minor].ulIntVector + _OFFSET ) { \ |
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458 | mg5uart_process_isr_ ## _TYPE (minor); \ |
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459 | return; \ |
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460 | } \ |
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461 | } \ |
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462 | mips_default_isr( vector ); \ |
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463 | } |
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464 | |
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465 | __ISR(rx_frame_error, MG5UART_IRQ_RX_FRAME_ERROR) |
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466 | __ISR(rx_overrun_error, MG5UART_IRQ_RX_OVERRUN_ERROR) |
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467 | __ISR(tx_empty, MG5UART_IRQ_TX_EMPTY) |
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468 | __ISR(tx_ready, MG5UART_IRQ_TX_READY) |
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469 | __ISR(rx_ready, MG5UART_IRQ_RX_READY) |
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470 | |
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471 | |
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472 | |
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473 | |
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474 | |
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475 | MG5UART_STATIC void mg5uart_process_isr_rx_error( |
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476 | int minor, |
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477 | uint32_t mask |
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478 | ) |
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479 | { |
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480 | uint32_t pMG5UART; |
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481 | int shift; |
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482 | |
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483 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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484 | |
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485 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
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486 | shift = MONGOOSEV_UART0_IRQ_SHIFT; |
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487 | else |
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488 | shift = MONGOOSEV_UART1_IRQ_SHIFT; |
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489 | |
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490 | /* now clear the error */ |
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491 | |
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492 | MG5UART_SETREG( |
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493 | pMG5UART, |
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494 | MG5UART_STATUS_REGISTER, |
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495 | mask << shift ); |
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496 | } |
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497 | |
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498 | |
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499 | MG5UART_STATIC void mg5uart_process_isr_rx_frame_error( |
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500 | int minor |
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501 | ) |
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502 | { |
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503 | mg5uart_process_isr_rx_error( minor, MONGOOSEV_UART_RX_FRAME_ERROR ); |
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504 | } |
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505 | |
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506 | MG5UART_STATIC void mg5uart_process_isr_rx_overrun_error( |
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507 | int minor |
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508 | ) |
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509 | { |
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510 | mg5uart_process_isr_rx_error( minor, MONGOOSEV_UART_RX_OVERRUN_ERROR ); |
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511 | } |
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512 | |
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513 | |
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514 | |
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515 | |
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516 | |
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517 | |
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518 | |
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519 | |
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520 | MG5UART_STATIC void mg5uart_process_tx_isr( |
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521 | int minor, |
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522 | uint32_t source |
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523 | ) |
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524 | { |
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525 | uint32_t pMG5UART; |
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526 | int shift; |
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527 | |
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528 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
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529 | |
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530 | mg5uart_enable_interrupts(minor, MG5UART_ENABLE_ALL_EXCEPT_TX); |
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531 | |
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532 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
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533 | shift = MONGOOSEV_UART0_IRQ_SHIFT; |
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534 | else |
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535 | shift = MONGOOSEV_UART1_IRQ_SHIFT; |
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536 | |
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537 | MG5UART_SETREG( |
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538 | pMG5UART, |
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539 | MG5UART_STATUS_REGISTER, |
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540 | source << shift ); |
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541 | |
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542 | if( rtems_termios_dequeue_characters( Console_Port_Data[minor].termios_data, 1) ) |
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543 | { |
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544 | mg5uart_enable_interrupts(minor, MG5UART_ENABLE_ALL); |
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545 | return; |
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546 | } |
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547 | |
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548 | /* |
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549 | * There are no more characters to transmit. The tx interrupts are be cleared |
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550 | * by writing data to the uart, so just disable the tx interrupt sources. |
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551 | */ |
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552 | |
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553 | Console_Port_Data[minor].bActive = FALSE; |
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554 | |
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555 | /* mg5uart_enable_interrupts(minor, MG5UART_ENABLE_ALL_EXCEPT_TX); */ |
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556 | } |
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557 | |
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558 | |
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559 | |
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560 | MG5UART_STATIC void mg5uart_process_isr_tx_empty( |
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561 | int minor |
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562 | ) |
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563 | { |
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564 | /* mg5uart_process_tx_isr( minor, MONGOOSEV_UART_TX_EMPTY ); */ |
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565 | } |
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566 | |
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567 | MG5UART_STATIC void mg5uart_process_isr_tx_ready( |
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568 | int minor |
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569 | ) |
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570 | { |
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571 | mg5uart_process_tx_isr( minor, MONGOOSEV_UART_TX_READY ); |
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572 | } |
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573 | |
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574 | |
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575 | |
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576 | |
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577 | |
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578 | MG5UART_STATIC void mg5uart_process_isr_rx_ready( |
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579 | int minor |
---|
580 | ) |
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581 | { |
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582 | uint32_t pMG5UART_port; |
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583 | unsigned char c; |
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584 | |
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585 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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586 | |
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587 | /* reading the RX buffer automatically resets the interrupt flag */ |
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588 | |
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589 | c = (unsigned char) MG5UART_GETREG(pMG5UART_port, MG5UART_RX_BUFFER); |
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590 | |
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591 | rtems_termios_enqueue_raw_characters( |
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592 | Console_Port_Data[minor].termios_data, |
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593 | &c, 1 ); |
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594 | } |
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595 | |
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596 | |
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597 | |
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598 | |
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599 | |
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600 | |
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601 | /* |
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602 | * mg5uart_initialize_interrupts |
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603 | * |
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604 | * This routine initializes the console's receive and transmit |
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605 | * ring buffers and loads the appropriate vectors to handle the interrupts. |
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606 | */ |
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607 | |
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608 | MG5UART_STATIC void mg5uart_initialize_interrupts(int minor) |
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609 | { |
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610 | unsigned long v; |
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611 | mg5uart_init(minor); |
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612 | |
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613 | Console_Port_Data[minor].bActive = FALSE; |
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614 | v = Console_Port_Tbl[minor].ulIntVector; |
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615 | |
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616 | set_vector(mg5uart_isr_rx_frame_error, v + MG5UART_IRQ_RX_FRAME_ERROR, 1); |
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617 | set_vector(mg5uart_isr_rx_overrun_error, v + MG5UART_IRQ_RX_OVERRUN_ERROR, 1); |
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618 | set_vector(mg5uart_isr_tx_empty, v + MG5UART_IRQ_TX_EMPTY, 1); |
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619 | set_vector(mg5uart_isr_tx_ready, v + MG5UART_IRQ_TX_READY, 1); |
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620 | set_vector(mg5uart_isr_rx_ready, v + MG5UART_IRQ_RX_READY, 1); |
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621 | |
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622 | mg5uart_enable_interrupts(minor, MG5UART_ENABLE_ALL_EXCEPT_TX); |
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623 | } |
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624 | |
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625 | |
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626 | |
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627 | |
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628 | |
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629 | /* |
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630 | * mg5uart_write_support_int |
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631 | * |
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632 | * Console Termios output entry point when using interrupt driven output. |
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633 | */ |
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634 | |
---|
635 | MG5UART_STATIC int mg5uart_write_support_int( |
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636 | int minor, |
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637 | const char *buf, |
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638 | int len |
---|
639 | ) |
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640 | { |
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641 | uint32_t Irql; |
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642 | uint32_t pMG5UART_port; |
---|
643 | |
---|
644 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
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645 | |
---|
646 | /* |
---|
647 | * We are using interrupt driven output and termios only sends us |
---|
648 | * one character at a time. |
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649 | */ |
---|
650 | |
---|
651 | if ( !len ) |
---|
652 | return 0; |
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653 | |
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654 | /* |
---|
655 | * Put the character out and enable interrupts if necessary. |
---|
656 | */ |
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657 | |
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658 | rtems_interrupt_disable(Irql); |
---|
659 | |
---|
660 | MG5UART_SETREG(pMG5UART_port, MG5UART_TX_BUFFER, *buf); |
---|
661 | |
---|
662 | if( Console_Port_Data[minor].bActive == FALSE ) |
---|
663 | { |
---|
664 | Console_Port_Data[minor].bActive = TRUE; |
---|
665 | mg5uart_enable_interrupts(minor, MG5UART_ENABLE_ALL); |
---|
666 | } |
---|
667 | |
---|
668 | rtems_interrupt_enable(Irql); |
---|
669 | return 1; |
---|
670 | } |
---|
671 | |
---|
672 | |
---|
673 | |
---|
674 | |
---|
675 | /* |
---|
676 | * mg5uart_write_support_polled |
---|
677 | * |
---|
678 | * Console Termios output entry point when using polled output. |
---|
679 | * |
---|
680 | */ |
---|
681 | |
---|
682 | MG5UART_STATIC int mg5uart_write_support_polled( |
---|
683 | int minor, |
---|
684 | const char *buf, |
---|
685 | int len |
---|
686 | ) |
---|
687 | { |
---|
688 | int nwrite = 0; |
---|
689 | |
---|
690 | /* |
---|
691 | * poll each byte in the string out of the port. |
---|
692 | */ |
---|
693 | while (nwrite < len) |
---|
694 | { |
---|
695 | mg5uart_write_polled(minor, *buf++); |
---|
696 | nwrite++; |
---|
697 | } |
---|
698 | |
---|
699 | /* |
---|
700 | * return the number of bytes written. |
---|
701 | */ |
---|
702 | return nwrite; |
---|
703 | } |
---|
704 | |
---|
705 | /* |
---|
706 | * mg5uart_inbyte_nonblocking_polled |
---|
707 | * |
---|
708 | * Console Termios polling input entry point. |
---|
709 | */ |
---|
710 | |
---|
711 | MG5UART_STATIC int mg5uart_inbyte_nonblocking_polled( |
---|
712 | int minor |
---|
713 | ) |
---|
714 | { |
---|
715 | uint32_t pMG5UART; |
---|
716 | uint32_t pMG5UART_port; |
---|
717 | uint32_t status; |
---|
718 | uint32_t tmp,shift; |
---|
719 | |
---|
720 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
721 | pMG5UART_port = Console_Port_Tbl[minor].ulCtrlPort2; |
---|
722 | |
---|
723 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
---|
724 | shift = MONGOOSEV_UART0_IRQ_SHIFT; |
---|
725 | else |
---|
726 | shift = MONGOOSEV_UART1_IRQ_SHIFT; |
---|
727 | |
---|
728 | /* reset overrrun or framing errors */ |
---|
729 | status = MG5UART_GETREG(pMG5UART, MG5UART_STATUS_REGISTER) >> shift; |
---|
730 | |
---|
731 | if( (tmp = (status & 0x3)) ) |
---|
732 | { |
---|
733 | MG5UART_SETREG(pMG5UART, MG5UART_STATUS_REGISTER, (tmp << shift) ); |
---|
734 | status = MG5UART_GETREG(pMG5UART, MG5UART_STATUS_REGISTER) >> shift; |
---|
735 | } |
---|
736 | |
---|
737 | if ( status & MONGOOSEV_UART_RX_READY ) |
---|
738 | { |
---|
739 | return (int) MG5UART_GETREG(pMG5UART_port, MG5UART_RX_BUFFER); |
---|
740 | } |
---|
741 | else |
---|
742 | { |
---|
743 | return -1; |
---|
744 | } |
---|
745 | } |
---|
746 | |
---|
747 | /* |
---|
748 | * mg5uart_baud_rate |
---|
749 | */ |
---|
750 | |
---|
751 | MG5UART_STATIC int mg5uart_baud_rate( |
---|
752 | int minor, |
---|
753 | uint32_t baud, |
---|
754 | uint32_t *code |
---|
755 | ) |
---|
756 | { |
---|
757 | uint32_t clock; |
---|
758 | uint32_t tmp_code; |
---|
759 | uint32_t baud_requested; |
---|
760 | |
---|
761 | baud_requested = baud & CBAUD; |
---|
762 | if (!baud_requested) |
---|
763 | baud_requested = B9600; /* default to 9600 baud */ |
---|
764 | |
---|
765 | baud_requested = termios_baud_to_number( baud_requested ); |
---|
766 | |
---|
767 | clock = (uint32_t) Console_Port_Tbl[minor].ulClock; |
---|
768 | if (!clock) |
---|
769 | rtems_fatal_error_occurred(RTEMS_INVALID_NUMBER); |
---|
770 | |
---|
771 | /* |
---|
772 | * Formula is Code = round(ClockFrequency / Baud - 1). |
---|
773 | * |
---|
774 | * Since this is integer math, we will divide by twice the baud and |
---|
775 | * check the remaining odd bit. |
---|
776 | */ |
---|
777 | |
---|
778 | tmp_code = (clock / baud_requested) - 1; |
---|
779 | |
---|
780 | /* |
---|
781 | * From section 12.7, "Keep C>100 for best receiver operation." |
---|
782 | * That is 100 cycles which is not a lot of instructions. It is |
---|
783 | * reasonable to think that the Mongoose-V could not keep |
---|
784 | * up with C < 100. |
---|
785 | */ |
---|
786 | |
---|
787 | if ( tmp_code < 100 ) |
---|
788 | return RTEMS_INVALID_NUMBER; |
---|
789 | |
---|
790 | /* |
---|
791 | * upper word is receiver baud and lower word is transmitter baud |
---|
792 | */ |
---|
793 | |
---|
794 | *code = (tmp_code << 16) | tmp_code; |
---|
795 | |
---|
796 | return 0; |
---|
797 | } |
---|
798 | |
---|
799 | |
---|
800 | |
---|
801 | |
---|
802 | /* |
---|
803 | * mg5uart_enable_interrupts |
---|
804 | * |
---|
805 | * This function enables specific interrupt sources on the DUART. |
---|
806 | */ |
---|
807 | |
---|
808 | MG5UART_STATIC void mg5uart_enable_interrupts( |
---|
809 | int minor, |
---|
810 | int mask |
---|
811 | ) |
---|
812 | { |
---|
813 | uint32_t pMG5UART; |
---|
814 | uint32_t maskSave; |
---|
815 | uint32_t shift; |
---|
816 | rtems_interrupt_level Irql; |
---|
817 | |
---|
818 | pMG5UART = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
819 | |
---|
820 | /* |
---|
821 | * Enable interrupts on RX and TX -- not break |
---|
822 | */ |
---|
823 | |
---|
824 | if ( Console_Port_Tbl[minor].ulDataPort == MG5UART_UART0 ) |
---|
825 | shift = MONGOOSEV_UART0_IRQ_SHIFT; |
---|
826 | else |
---|
827 | shift = MONGOOSEV_UART1_IRQ_SHIFT; |
---|
828 | |
---|
829 | |
---|
830 | rtems_interrupt_disable(Irql); |
---|
831 | |
---|
832 | maskSave = MG5UART_GETREG( pMG5UART, MG5UART_INTERRUPT_MASK_REGISTER ); |
---|
833 | |
---|
834 | MG5UART_SETREG( |
---|
835 | pMG5UART, |
---|
836 | MG5UART_INTERRUPT_MASK_REGISTER, |
---|
837 | (maskSave & ~(MONGOOSEV_UART_ALL_STATUS_BITS << shift)) | (mask << shift) ); |
---|
838 | |
---|
839 | rtems_interrupt_enable(Irql); |
---|
840 | } |
---|
841 | |
---|
842 | |
---|
843 | |
---|
844 | /* |
---|
845 | * Flow control is only supported when using interrupts |
---|
846 | */ |
---|
847 | |
---|
848 | console_fns mg5uart_fns = |
---|
849 | { |
---|
850 | libchip_serial_default_probe, /* deviceProbe */ |
---|
851 | mg5uart_open, /* deviceFirstOpen */ |
---|
852 | NULL, /* deviceLastClose */ |
---|
853 | NULL, /* deviceRead */ |
---|
854 | mg5uart_write_support_int, /* deviceWrite */ |
---|
855 | mg5uart_initialize_interrupts, /* deviceInitialize */ |
---|
856 | mg5uart_write_polled, /* deviceWritePolled */ |
---|
857 | mg5uart_set_attributes, /* deviceSetAttributes */ |
---|
858 | TRUE /* deviceOutputUsesInterrupts */ |
---|
859 | }; |
---|
860 | |
---|
861 | console_fns mg5uart_fns_polled = |
---|
862 | { |
---|
863 | libchip_serial_default_probe, /* deviceProbe */ |
---|
864 | mg5uart_open, /* deviceFirstOpen */ |
---|
865 | mg5uart_close, /* deviceLastClose */ |
---|
866 | mg5uart_inbyte_nonblocking_polled, /* deviceRead */ |
---|
867 | mg5uart_write_support_polled, /* deviceWrite */ |
---|
868 | mg5uart_init, /* deviceInitialize */ |
---|
869 | mg5uart_write_polled, /* deviceWritePolled */ |
---|
870 | mg5uart_set_attributes, /* deviceSetAttributes */ |
---|
871 | FALSE, /* deviceOutputUsesInterrupts */ |
---|
872 | }; |
---|