1 | /* |
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2 | * This file contains the hardware specific portions of the TTY driver |
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3 | * for the serial port on the MVME230x. |
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4 | * |
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5 | * COPYRIGHT (c) 1989-1997. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * Copyright assigned to U.S. Government, 1994. |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <termios.h> |
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17 | #include <bsp.h> |
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18 | #include <rtems/libio.h> |
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19 | #include <stdlib.h> |
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20 | |
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21 | /* PC16550D register definitions */ |
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22 | #define UART_BASE_ADDR ((char *) IO_TO_LOCAL(0x03f8)) |
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23 | |
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24 | #define RBR 0 |
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25 | #define THR 0 |
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26 | #define DLL 0 |
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27 | #define DLM 1 |
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28 | |
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29 | #define LCR 3 |
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30 | # define FIVE_BITS 0x2 |
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31 | # define SIX_BITS 0x2 |
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32 | # define SEVEN_BITS 0x2 |
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33 | # define EIGHT_BITS 0x3 |
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34 | # define ONE_STOP_BIT 0x0 |
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35 | # define TWO_STOP_BITS 0x4 |
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36 | # define NO_PARITY 0x00 |
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37 | # define ODD_PARITY 0x08 |
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38 | # define EVEN_PARITY 0x18 |
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39 | # define DLAB 0x80 |
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40 | |
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41 | #define LSR 5 |
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42 | # define DR 0x01 |
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43 | # define OE 0x02 |
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44 | # define PE 0x04 |
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45 | # define FE 0x08 |
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46 | # define BI 0x10 |
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47 | # define THRE 0x20 |
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48 | # define TEMT 0x40 |
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49 | # define ERR_IN_FIFO 0x40 |
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50 | |
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51 | #define FCR 2 |
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52 | # define ENABLE_FIFOS 0x01 |
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53 | # define RESET_RC_FIFO 0x02 |
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54 | # define RESET_TX_FIFO 0x04 |
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55 | # define FIFO_MODE_1 0x08 |
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56 | # define RX_TRIGGER_1 0x00 |
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57 | # define RX_TRIGGER_4 0x40 |
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58 | # define RX_TRIGGER_8 0x80 |
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59 | # define RX_TRIGGER_14 0xC0 |
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60 | |
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61 | #define IIR 2 |
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62 | # define NO_INTS_PENDING 0x01 |
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63 | # define RX_ERROR 0x06 |
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64 | # define RX_DATA_READY 0x04 |
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65 | # define TX_NOT_FULL 0x02 |
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66 | # define MODEM_STATUS 0x00 |
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67 | # define INT_ID_MASK 0x06 |
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68 | |
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69 | #define IER 1 |
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70 | # define ENA_RX_READY_INT 0x1 |
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71 | # define ENA_TX_EMPTY_INT 0x2 |
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72 | # define ENA_RX_ERROR_INT 0x4 |
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73 | # define ENA_MODEM_STATUS_INT 0x8 |
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74 | |
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75 | #define MSR 6 |
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76 | # define DELTA_CTS 0x01 |
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77 | # define DELTA_DSR 0x02 |
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78 | # define END_OF_RING 0x04 |
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79 | # define DELTA_DCD 0x08 |
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80 | # define CTS 0x10 |
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81 | # define DSR 0x20 |
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82 | # define RING 0x40 |
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83 | # define DCD 0x80 |
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84 | |
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85 | #define MCR 4 |
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86 | # define DTR 0x01 |
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87 | # define RTS 0x02 |
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88 | # define OUT1 0x04 |
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89 | # define OUT2 0x08 |
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90 | # define LOOPBACK 0x10 |
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91 | |
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92 | #define SCR 7 |
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93 | |
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94 | int use_polled_io = CONSOLE_USE_POLLED; |
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95 | void *tty_ptr_for_irq; |
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96 | |
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97 | /* |
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98 | * Hardware-dependent portion of tcsetattr(). |
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99 | */ |
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100 | static int |
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101 | setAttributes (int minor, const struct termios *t) |
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102 | { |
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103 | int divisor; |
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104 | volatile char *uart = UART_BASE_ADDR; |
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105 | char lcr_image = 0; |
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106 | |
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107 | /* set character size */ |
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108 | switch (t->c_cflag & CSIZE) { |
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109 | case CS5: lcr_image = FIVE_BITS; break; |
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110 | case CS6: lcr_image = SIX_BITS; break; |
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111 | case CS7: lcr_image = SEVEN_BITS; break; |
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112 | case CS8: lcr_image = EIGHT_BITS; break; |
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113 | } |
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114 | |
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115 | /* set number of stop bits */ |
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116 | if (t->c_cflag & CSTOPB) { |
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117 | lcr_image |= TWO_STOP_BITS; |
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118 | } else { |
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119 | lcr_image |= ONE_STOP_BIT; |
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120 | } |
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121 | |
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122 | /* set parity */ |
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123 | if ((t->c_cflag & PARENB) == 0) { |
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124 | lcr_image |= NO_PARITY; |
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125 | } else if (t->c_cflag & PARODD) { |
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126 | lcr_image |= ODD_PARITY; |
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127 | } else { |
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128 | lcr_image |= EVEN_PARITY; |
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129 | } |
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130 | |
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131 | /* set the baud rate */ |
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132 | switch (t->c_cflag & CBAUD) { |
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133 | default: divisor = -1; break; |
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134 | case B50: divisor = 2304; break; |
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135 | case B75: divisor = 1536; break; |
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136 | case B110: divisor = 1047; break; |
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137 | case B134: divisor = 857; break; |
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138 | case B150: divisor = 768; break; |
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139 | case B200: divisor = 576; break; |
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140 | case B300: divisor = 384; break; |
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141 | case B600: divisor = 192; break; |
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142 | case B1200: divisor = 96; break; |
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143 | case B1800: divisor = 64; break; |
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144 | case B2400: divisor = 48; break; |
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145 | case B4800: divisor = 24; break; |
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146 | case B9600: divisor = 12; break; |
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147 | case B19200: divisor = 6; break; |
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148 | case B38400: divisor = 3; break; |
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149 | case B57600: divisor = 2; break; |
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150 | case B115200: divisor = -1; break; |
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151 | case B230400: divisor = -1; break; |
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152 | case B460800: divisor = -1; break; |
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153 | } |
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154 | if (divisor > 0) { |
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155 | uart[LCR] = (lcr_image |= DLAB); |
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156 | uart[DLM] = divisor >> 8; |
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157 | uart[DLL] = divisor; |
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158 | lcr_image &= ~DLAB; |
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159 | } |
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160 | |
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161 | /* activate the new configuration */ |
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162 | uart[LCR] = lcr_image; |
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163 | return 0; |
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164 | } |
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165 | |
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166 | /* |
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167 | * Interrupt handler |
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168 | */ |
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169 | static rtems_isr consoleInterruptHandler (rtems_vector_number v) |
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170 | { |
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171 | volatile char *uart = UART_BASE_ADDR; |
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172 | volatile char ignore; |
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173 | char buffer[16], iir_image; |
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174 | int len; |
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175 | |
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176 | while (((iir_image = uart[IIR]) & NO_INTS_PENDING) == 0) { |
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177 | switch (iir_image & INT_ID_MASK) { |
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178 | case RX_ERROR: |
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179 | /* |
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180 | * read the line status register to clear condition. |
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181 | * nothing done with the information at this point. |
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182 | */ |
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183 | ignore = uart[LSR]; |
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184 | break; |
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185 | case RX_DATA_READY: |
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186 | /* |
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187 | * empty the receive fifo and transfer bytes to termios layer |
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188 | */ |
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189 | len = 0; |
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190 | do { |
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191 | buffer[len++] = uart[RBR]; |
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192 | } while (len < sizeof(buffer) && (uart[LSR] & DR)); |
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193 | rtems_termios_enqueue_raw_characters(tty_ptr_for_irq, |
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194 | buffer, len); |
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195 | break; |
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196 | case TX_NOT_FULL: |
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197 | /* |
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198 | * notify termios layer that characters have been sent |
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199 | */ |
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200 | len = uart[SCR]; |
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201 | /* we'll get one interrupt when we start - ignore it */ |
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202 | if (len) { |
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203 | rtems_termios_dequeue_characters(tty_ptr_for_irq, len); |
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204 | } |
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205 | break; |
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206 | case MODEM_STATUS: |
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207 | /* |
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208 | * read the modem status register to clear condition. |
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209 | * nothing done with the information at this point. |
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210 | */ |
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211 | ignore = uart[MSR]; |
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212 | break; |
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213 | } |
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214 | } |
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215 | } |
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216 | |
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217 | /* |
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218 | * console_inbyte_nonblocking |
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219 | * |
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220 | * This routine polls for a character. |
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221 | */ |
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222 | |
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223 | int console_inbyte_nonblocking( |
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224 | int port |
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225 | ) |
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226 | { |
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227 | volatile char *uart = UART_BASE_ADDR; |
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228 | |
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229 | if (uart[LSR] & DR) { |
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230 | return uart[RBR]; |
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231 | } else { |
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232 | return -1; |
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233 | } |
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234 | } |
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235 | |
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236 | |
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237 | /* |
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238 | * Console Termios Support Entry Points |
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239 | * |
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240 | */ |
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241 | |
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242 | int console_write_polled ( |
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243 | int minor, |
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244 | const char *buf, |
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245 | int len |
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246 | ) |
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247 | { |
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248 | int nwrite = 0; |
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249 | volatile char *uart = UART_BASE_ADDR; |
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250 | |
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251 | while (nwrite < len) { |
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252 | /* wait as long as needed for transmit buffer to empty */ |
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253 | while ((uart[LSR] & THRE) == 0) ; |
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254 | uart[THR] = *buf++; |
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255 | nwrite++; |
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256 | } |
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257 | |
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258 | /* return value seems to be ignored by termios layer, we'll return count */ |
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259 | return nwrite; |
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260 | } |
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261 | |
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262 | int console_write_interrupts ( |
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263 | int minor, |
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264 | const char *buf, |
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265 | int len |
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266 | ) |
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267 | { |
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268 | const int FIFO_depth = 16; |
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269 | int nwrite; |
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270 | volatile char *uart = UART_BASE_ADDR; |
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271 | |
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272 | /* write up to len characters, stopping if FIFO fills */ |
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273 | for (nwrite = 0; nwrite < len && nwrite < FIFO_depth; nwrite++) { |
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274 | uart[THR] = *buf++; |
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275 | } |
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276 | |
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277 | /* save count of bytes sent so interrupt can report it to termios layer */ |
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278 | uart[SCR] = nwrite; |
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279 | |
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280 | /* return value seems to be ignored by termios layer, we'll return count */ |
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281 | return nwrite; |
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282 | } |
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283 | |
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284 | /* |
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285 | * Console Device Driver Entry Points |
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286 | * |
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287 | */ |
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288 | |
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289 | /* |
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290 | * Initialize and register the device |
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291 | */ |
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292 | rtems_device_driver console_initialize( |
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293 | rtems_device_major_number major, |
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294 | rtems_device_minor_number minor, |
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295 | void *arg |
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296 | ) |
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297 | { |
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298 | rtems_status_code status; |
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299 | volatile char *uart = UART_BASE_ADDR; |
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300 | |
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301 | rtems_termios_initialize(); |
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302 | |
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303 | /* |
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304 | * Register Device Names |
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305 | */ |
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306 | |
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307 | status = rtems_io_register_name( "/dev/console", major, 0 ); |
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308 | if (status != RTEMS_SUCCESSFUL) { |
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309 | rtems_fatal_error_occurred(status); |
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310 | } |
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311 | /* default mode: 9600 bps, 8 bits, 1 stop, no parity */ |
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312 | # define DEFAULT_MODE (EIGHT_BITS | ONE_STOP_BIT | NO_PARITY) |
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313 | uart[LCR] = DEFAULT_MODE | DLAB; |
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314 | uart[DLM] = 0; |
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315 | uart[DLL] = 12; |
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316 | uart[LCR] = DEFAULT_MODE; |
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317 | |
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318 | /* enable the receive and transmit FIFOs */ |
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319 | uart[FCR] = ENABLE_FIFOS | RESET_RC_FIFO | RESET_TX_FIFO | RX_TRIGGER_1; |
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320 | |
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321 | /* set modem control lines */ |
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322 | uart[MCR] = DTR | RTS; |
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323 | |
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324 | /* zero the scratch register - this will hold a count of tx characters */ |
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325 | uart[SCR] = 0; |
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326 | |
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327 | /* initialize interrupts */ |
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328 | if (!use_polled_io) { |
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329 | rtems_isr_entry old_handler; |
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330 | rtems_status_code sc; |
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331 | |
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332 | sc = bsp_interrupt_catch(consoleInterruptHandler, IRQ_UART, |
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333 | &old_handler); |
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334 | sc = bsp_interrupt_enable(IRQ_UART, PRIORITY_ISA_INT); |
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335 | uart[IER] = ENA_RX_READY_INT | ENA_TX_EMPTY_INT; |
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336 | } else { |
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337 | uart[IER] = 0; |
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338 | } |
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339 | return RTEMS_SUCCESSFUL; |
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340 | } |
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341 | |
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342 | /* |
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343 | * Open the device |
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344 | */ |
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345 | rtems_device_driver console_open( |
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346 | rtems_device_major_number major, |
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347 | rtems_device_minor_number minor, |
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348 | void * arg |
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349 | ) |
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350 | { |
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351 | rtems_status_code sc; |
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352 | static const rtems_termios_callbacks pollCallbacks = { |
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353 | NULL, /* firstOpen */ |
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354 | NULL, /* lastClose */ |
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355 | console_inbyte_nonblocking, /* pollRead */ |
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356 | console_write_polled, /* write */ |
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357 | setAttributes, /* setAttributes */ |
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358 | NULL, /* stopRemoteTx */ |
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359 | NULL, /* startRemoteTx */ |
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360 | 0 /* outputUsesInterrupts */ |
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361 | }; |
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362 | static const rtems_termios_callbacks intrCallbacks = { |
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363 | NULL, /* firstOpen */ |
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364 | NULL, /* lastClose */ |
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365 | NULL, /* pollRead */ |
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366 | console_write_interrupts, /* write */ |
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367 | setAttributes, /* setAttributes */ |
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368 | NULL, /* stopRemoteTx */ |
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369 | NULL, /* startRemoteTx */ |
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370 | 1 /* outputUsesInterrupts */ |
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371 | }; |
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372 | |
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373 | |
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374 | if ( minor > 1 ) |
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375 | return RTEMS_INVALID_NUMBER; |
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376 | |
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377 | if (use_polled_io) { |
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378 | sc = rtems_termios_open (major, minor, arg, &pollCallbacks ); |
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379 | } else { |
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380 | sc = rtems_termios_open (major, minor, arg, &intrCallbacks ); |
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381 | tty_ptr_for_irq = ((rtems_libio_open_close_args_t *)arg)->iop->data1; |
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382 | } |
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383 | return RTEMS_SUCCESSFUL; |
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384 | } |
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385 | |
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386 | /* |
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387 | * Close the device |
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388 | */ |
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389 | rtems_device_driver console_close( |
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390 | rtems_device_major_number major, |
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391 | rtems_device_minor_number minor, |
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392 | void * arg |
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393 | ) |
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394 | { |
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395 | return rtems_termios_close (arg); |
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396 | } |
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397 | |
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398 | /* |
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399 | * Read from the device |
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400 | */ |
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401 | rtems_device_driver console_read( |
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402 | rtems_device_major_number major, |
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403 | rtems_device_minor_number minor, |
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404 | void * arg |
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405 | ) |
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406 | { |
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407 | return rtems_termios_read (arg); |
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408 | } |
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409 | |
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410 | /* |
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411 | * Write to the device |
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412 | */ |
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413 | rtems_device_driver console_write( |
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414 | rtems_device_major_number major, |
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415 | rtems_device_minor_number minor, |
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416 | void * arg |
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417 | ) |
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418 | { |
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419 | return rtems_termios_write (arg); |
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420 | } |
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421 | |
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422 | /* |
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423 | * Handle ioctl request. |
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424 | */ |
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425 | rtems_device_driver console_control( |
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426 | rtems_device_major_number major, |
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427 | rtems_device_minor_number minor, |
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428 | void * arg |
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429 | ) |
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430 | { |
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431 | return rtems_termios_ioctl (arg); |
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432 | } |
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433 | |
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434 | /* |
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435 | * Reserve resources consumed by this driver |
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436 | */ |
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437 | void console_reserve_resources( |
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438 | rtems_configuration_table *configuration |
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439 | ) |
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440 | { |
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441 | rtems_termios_reserve_resources( configuration, 1 ); |
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442 | } |
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