1 | /* |
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2 | * This file contains the TTY driver for the National Semiconductor NS16550. |
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3 | * |
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4 | * This part is widely cloned and second sourced. It is found in a number |
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5 | * of "Super IO" controllers. |
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6 | * |
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7 | * COPYRIGHT (c) 1998 by Radstone Technology |
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8 | * |
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9 | * |
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10 | * THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY |
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11 | * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE |
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12 | * IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK |
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13 | * AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU. |
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14 | * |
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15 | * You are hereby granted permission to use, copy, modify, and distribute |
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16 | * this file, provided that this notice, plus the above copyright notice |
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17 | * and disclaimer, appears in all copies. Radstone Technology will provide |
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18 | * no support for this code. |
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19 | * |
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20 | * This driver uses the termios pseudo driver. |
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21 | */ |
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22 | |
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23 | #include <rtems.h> |
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24 | #include <rtems/libio.h> |
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25 | #include <stdlib.h> |
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26 | #include <ringbuf.h> |
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27 | |
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28 | #include <libchip/serial.h> |
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29 | #include "ns16550_p.h" |
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30 | #include "sersupp.h" |
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31 | |
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32 | /* |
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33 | * Flow control is only supported when using interrupts |
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34 | */ |
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35 | |
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36 | console_flow ns16550_flow_RTSCTS = { |
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37 | ns16550_negate_RTS, /* deviceStopRemoteTx */ |
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38 | ns16550_assert_RTS /* deviceStartRemoteTx */ |
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39 | }; |
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40 | |
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41 | console_flow ns16550_flow_DTRCTS = { |
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42 | ns16550_negate_DTR, /* deviceStopRemoteTx */ |
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43 | ns16550_assert_DTR /* deviceStartRemoteTx */ |
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44 | }; |
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45 | |
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46 | console_fns ns16550_fns = { |
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47 | libchip_serial_default_probe, /* deviceProbe */ |
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48 | ns16550_open, /* deviceFirstOpen */ |
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49 | NULL, /* deviceLastClose */ |
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50 | NULL, /* deviceRead */ |
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51 | ns16550_write_support_int, /* deviceWrite */ |
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52 | ns16550_initialize_interrupts, /* deviceInitialize */ |
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53 | ns16550_write_polled, /* deviceWritePolled */ |
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54 | ns16550_set_attributes, /* deviceSetAttributes */ |
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55 | TRUE /* deviceOutputUsesInterrupts */ |
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56 | }; |
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57 | |
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58 | console_fns ns16550_fns_polled = { |
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59 | libchip_serial_default_probe, /* deviceProbe */ |
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60 | ns16550_open, /* deviceFirstOpen */ |
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61 | ns16550_close, /* deviceLastClose */ |
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62 | ns16550_inbyte_nonblocking_polled, /* deviceRead */ |
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63 | ns16550_write_support_polled, /* deviceWrite */ |
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64 | ns16550_init, /* deviceInitialize */ |
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65 | ns16550_write_polled, /* deviceWritePolled */ |
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66 | ns16550_set_attributes, /* deviceSetAttributes */ |
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67 | FALSE /* deviceOutputUsesInterrupts */ |
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68 | }; |
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69 | |
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70 | extern void set_vector( rtems_isr_entry, rtems_vector_number, int ); |
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71 | |
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72 | /* |
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73 | * ns16550_init |
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74 | */ |
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75 | |
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76 | NS16550_STATIC void ns16550_init(int minor) |
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77 | { |
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78 | unsigned32 pNS16550; |
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79 | unsigned8 ucTrash; |
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80 | unsigned8 ucDataByte; |
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81 | unsigned32 ulBaudDivisor; |
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82 | ns16550_context *pns16550Context; |
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83 | setRegister_f setReg; |
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84 | getRegister_f getReg; |
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85 | |
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86 | pns16550Context=(ns16550_context *)malloc(sizeof(ns16550_context)); |
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87 | |
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88 | Console_Port_Data[minor].pDeviceContext=(void *)pns16550Context; |
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89 | pns16550Context->ucModemCtrl=SP_MODEM_IRQ; |
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90 | |
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91 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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92 | setReg = Console_Port_Tbl[minor].setRegister; |
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93 | getReg = Console_Port_Tbl[minor].getRegister; |
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94 | |
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95 | /* Clear the divisor latch, clear all interrupt enables, |
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96 | * and reset and |
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97 | * disable the FIFO's. |
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98 | */ |
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99 | |
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100 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, 0x0); |
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101 | ns16550_enable_interrupts(minor, NS16550_DISABLE_ALL_INTR); |
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102 | |
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103 | /* Set the divisor latch and set the baud rate. */ |
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104 | |
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105 | ulBaudDivisor = NS16550_Baud( |
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106 | (unsigned32) Console_Port_Tbl[minor].ulClock, |
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107 | (unsigned32) Console_Port_Tbl[minor].pDeviceParams |
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108 | ); |
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109 | ucDataByte = SP_LINE_DLAB; |
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110 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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111 | |
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112 | /* XXX */ |
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113 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, ulBaudDivisor&0xff); |
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114 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, (ulBaudDivisor>>8)&0xff); |
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115 | |
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116 | /* Clear the divisor latch and set the character size to eight bits */ |
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117 | /* with one stop bit and no parity checking. */ |
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118 | ucDataByte = EIGHT_BITS; |
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119 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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120 | |
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121 | /* Enable and reset transmit and receive FIFOs. TJA */ |
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122 | ucDataByte = SP_FIFO_ENABLE; |
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123 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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124 | |
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125 | ucDataByte = SP_FIFO_ENABLE | SP_FIFO_RXRST | SP_FIFO_TXRST; |
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126 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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127 | |
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128 | ns16550_enable_interrupts(minor, NS16550_DISABLE_ALL_INTR); |
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129 | |
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130 | /* Set data terminal ready. */ |
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131 | /* And open interrupt tristate line */ |
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132 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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133 | |
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134 | ucTrash = (*getReg)(pNS16550, NS16550_LINE_STATUS ); |
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135 | ucTrash = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER ); |
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136 | } |
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137 | |
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138 | /* |
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139 | * ns16550_open |
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140 | */ |
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141 | |
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142 | NS16550_STATIC int ns16550_open( |
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143 | int major, |
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144 | int minor, |
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145 | void * arg |
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146 | ) |
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147 | { |
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148 | /* |
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149 | * Assert DTR |
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150 | */ |
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151 | |
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152 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_DTRCTS) { |
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153 | ns16550_assert_DTR(minor); |
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154 | } |
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155 | |
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156 | return(RTEMS_SUCCESSFUL); |
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157 | } |
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158 | |
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159 | /* |
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160 | * ns16550_close |
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161 | */ |
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162 | |
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163 | NS16550_STATIC int ns16550_close( |
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164 | int major, |
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165 | int minor, |
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166 | void * arg |
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167 | ) |
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168 | { |
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169 | /* |
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170 | * Negate DTR |
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171 | */ |
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172 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_DTRCTS) { |
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173 | ns16550_negate_DTR(minor); |
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174 | } |
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175 | |
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176 | return(RTEMS_SUCCESSFUL); |
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177 | } |
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178 | |
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179 | /* |
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180 | * ns16550_write_polled |
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181 | */ |
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182 | |
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183 | NS16550_STATIC void ns16550_write_polled( |
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184 | int minor, |
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185 | char cChar |
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186 | ) |
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187 | { |
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188 | unsigned32 pNS16550; |
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189 | unsigned char ucLineStatus; |
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190 | int iTimeout; |
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191 | getRegister_f getReg; |
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192 | setRegister_f setReg; |
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193 | |
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194 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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195 | getReg = Console_Port_Tbl[minor].getRegister; |
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196 | setReg = Console_Port_Tbl[minor].setRegister; |
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197 | |
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198 | /* |
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199 | * wait for transmitter holding register to be empty |
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200 | */ |
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201 | iTimeout=1000; |
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202 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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203 | while ((ucLineStatus & SP_LSR_THOLD) == 0) { |
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204 | /* |
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205 | * Yield while we wait |
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206 | */ |
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207 | #if 0 |
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208 | if(_System_state_Is_up(_System_state_Get())) { |
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209 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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210 | } |
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211 | #endif |
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212 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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213 | if(!--iTimeout) { |
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214 | break; |
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215 | } |
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216 | } |
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217 | |
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218 | /* |
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219 | * transmit character |
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220 | */ |
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221 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, cChar); |
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222 | } |
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223 | |
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224 | /* |
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225 | * These routines provide control of the RTS and DTR lines |
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226 | */ |
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227 | |
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228 | /* |
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229 | * ns16550_assert_RTS |
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230 | */ |
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231 | |
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232 | NS16550_STATIC int ns16550_assert_RTS(int minor) |
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233 | { |
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234 | unsigned32 pNS16550; |
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235 | unsigned32 Irql; |
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236 | ns16550_context *pns16550Context; |
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237 | setRegister_f setReg; |
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238 | |
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239 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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240 | |
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241 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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242 | setReg = Console_Port_Tbl[minor].setRegister; |
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243 | |
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244 | /* |
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245 | * Assert RTS |
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246 | */ |
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247 | rtems_interrupt_disable(Irql); |
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248 | pns16550Context->ucModemCtrl|=SP_MODEM_RTS; |
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249 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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250 | rtems_interrupt_enable(Irql); |
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251 | return 0; |
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252 | } |
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253 | |
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254 | /* |
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255 | * ns16550_negate_RTS |
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256 | */ |
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257 | |
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258 | NS16550_STATIC int ns16550_negate_RTS(int minor) |
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259 | { |
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260 | unsigned32 pNS16550; |
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261 | unsigned32 Irql; |
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262 | ns16550_context *pns16550Context; |
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263 | setRegister_f setReg; |
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264 | |
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265 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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266 | |
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267 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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268 | setReg = Console_Port_Tbl[minor].setRegister; |
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269 | |
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270 | /* |
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271 | * Negate RTS |
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272 | */ |
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273 | rtems_interrupt_disable(Irql); |
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274 | pns16550Context->ucModemCtrl&=~SP_MODEM_RTS; |
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275 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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276 | rtems_interrupt_enable(Irql); |
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277 | return 0; |
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278 | } |
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279 | |
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280 | /* |
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281 | * These flow control routines utilise a connection from the local DTR |
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282 | * line to the remote CTS line |
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283 | */ |
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284 | |
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285 | /* |
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286 | * ns16550_assert_DTR |
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287 | */ |
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288 | |
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289 | NS16550_STATIC int ns16550_assert_DTR(int minor) |
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290 | { |
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291 | unsigned32 pNS16550; |
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292 | unsigned32 Irql; |
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293 | ns16550_context *pns16550Context; |
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294 | setRegister_f setReg; |
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295 | |
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296 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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297 | |
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298 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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299 | setReg = Console_Port_Tbl[minor].setRegister; |
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300 | |
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301 | /* |
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302 | * Assert DTR |
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303 | */ |
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304 | rtems_interrupt_disable(Irql); |
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305 | pns16550Context->ucModemCtrl|=SP_MODEM_DTR; |
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306 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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307 | rtems_interrupt_enable(Irql); |
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308 | return 0; |
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309 | } |
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310 | |
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311 | /* |
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312 | * ns16550_negate_DTR |
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313 | */ |
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314 | |
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315 | NS16550_STATIC int ns16550_negate_DTR(int minor) |
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316 | { |
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317 | unsigned32 pNS16550; |
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318 | unsigned32 Irql; |
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319 | ns16550_context *pns16550Context; |
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320 | setRegister_f setReg; |
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321 | |
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322 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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323 | |
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324 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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325 | setReg = Console_Port_Tbl[minor].setRegister; |
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326 | |
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327 | /* |
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328 | * Negate DTR |
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329 | */ |
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330 | rtems_interrupt_disable(Irql); |
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331 | pns16550Context->ucModemCtrl&=~SP_MODEM_DTR; |
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332 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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333 | rtems_interrupt_enable(Irql); |
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334 | return 0; |
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335 | } |
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336 | |
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337 | /* |
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338 | * ns16550_set_attributes |
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339 | * |
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340 | * This function sets the channel to reflect the requested termios |
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341 | * port settings. |
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342 | */ |
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343 | |
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344 | NS16550_STATIC int ns16550_set_attributes( |
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345 | int minor, |
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346 | const struct termios *t |
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347 | ) |
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348 | { |
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349 | unsigned32 pNS16550; |
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350 | unsigned32 ulBaudDivisor; |
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351 | unsigned8 ucLineControl; |
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352 | unsigned32 baud_requested; |
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353 | setRegister_f setReg; |
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354 | getRegister_f getReg; |
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355 | unsigned32 Irql; |
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356 | |
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357 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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358 | setReg = Console_Port_Tbl[minor].setRegister; |
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359 | getReg = Console_Port_Tbl[minor].getRegister; |
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360 | |
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361 | /* |
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362 | * Calculate the baud rate divisor |
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363 | */ |
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364 | |
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365 | baud_requested = t->c_cflag & CBAUD; |
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366 | if (!baud_requested) |
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367 | baud_requested = B9600; /* default to 9600 baud */ |
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368 | |
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369 | ulBaudDivisor = NS16550_Baud( |
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370 | (unsigned32) Console_Port_Tbl[minor].ulClock, |
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371 | termios_baud_to_number(baud_requested) |
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372 | ); |
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373 | |
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374 | ucLineControl = 0; |
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375 | |
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376 | /* |
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377 | * Parity |
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378 | */ |
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379 | |
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380 | if (t->c_cflag & PARENB) { |
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381 | ucLineControl |= SP_LINE_PAR; |
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382 | if (!(t->c_cflag & PARODD)) |
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383 | ucLineControl |= SP_LINE_ODD; |
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384 | } |
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385 | |
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386 | /* |
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387 | * Character Size |
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388 | */ |
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389 | |
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390 | if (t->c_cflag & CSIZE) { |
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391 | switch (t->c_cflag & CSIZE) { |
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392 | case CS5: ucLineControl |= FIVE_BITS; break; |
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393 | case CS6: ucLineControl |= SIX_BITS; break; |
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394 | case CS7: ucLineControl |= SEVEN_BITS; break; |
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395 | case CS8: ucLineControl |= EIGHT_BITS; break; |
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396 | } |
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397 | } else { |
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398 | ucLineControl |= EIGHT_BITS; /* default to 9600,8,N,1 */ |
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399 | } |
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400 | |
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401 | /* |
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402 | * Stop Bits |
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403 | */ |
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404 | |
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405 | if (t->c_cflag & CSTOPB) { |
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406 | ucLineControl |= SP_LINE_STOP; /* 2 stop bits */ |
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407 | } else { |
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408 | ; /* 1 stop bit */ |
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409 | } |
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410 | |
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411 | /* |
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412 | * Now actually set the chip |
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413 | */ |
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414 | |
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415 | rtems_interrupt_disable(Irql); |
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416 | |
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417 | /* |
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418 | * Set the baud rate |
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419 | */ |
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420 | |
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421 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, SP_LINE_DLAB); |
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422 | /* XXX are these registers right? */ |
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423 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, ulBaudDivisor&0xff); |
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424 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, (ulBaudDivisor>>8)&0xff); |
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425 | |
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426 | /* |
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427 | * Now write the line control |
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428 | */ |
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429 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucLineControl ); |
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430 | |
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431 | rtems_interrupt_enable(Irql); |
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432 | |
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433 | return 0; |
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434 | } |
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435 | |
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436 | /* |
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437 | * ns16550_process |
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438 | * |
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439 | * This routine is the console interrupt handler for A port. |
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440 | */ |
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441 | |
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442 | NS16550_STATIC void ns16550_process( |
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443 | int minor |
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444 | ) |
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445 | { |
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446 | unsigned32 pNS16550; |
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447 | volatile unsigned8 ucLineStatus; |
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448 | volatile unsigned8 ucInterruptId; |
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449 | unsigned char cChar; |
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450 | getRegister_f getReg; |
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451 | setRegister_f setReg; |
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452 | |
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453 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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454 | getReg = Console_Port_Tbl[minor].getRegister; |
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455 | setReg = Console_Port_Tbl[minor].setRegister; |
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456 | |
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457 | do { |
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458 | /* |
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459 | * Deal with any received characters |
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460 | */ |
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461 | while(TRUE) { |
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462 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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463 | if(~ucLineStatus & SP_LSR_RDY) { |
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464 | break; |
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465 | } |
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466 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
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467 | rtems_termios_enqueue_raw_characters( |
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468 | Console_Port_Data[minor].termios_data, |
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469 | &cChar, |
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470 | 1 |
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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 | * TX all the characters we can |
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476 | */ |
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477 | |
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478 | while(TRUE) { |
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479 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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480 | if(~ucLineStatus & SP_LSR_THOLD) { |
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481 | /* |
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482 | * We'll get another interrupt when |
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483 | * the transmitter holding reg. becomes |
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484 | * free again |
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485 | */ |
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486 | break; |
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487 | } |
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488 | |
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489 | #if 0 |
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490 | /* XXX flow control not completely supported in libchip */ |
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491 | |
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492 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
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493 | ns16550_negate_RTS(minor); |
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494 | } |
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495 | #endif |
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496 | |
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497 | rtems_termios_dequeue_characters(Console_Port_Data[minor].termios_data, 1); |
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498 | if (rtems_termios_dequeue_characters( |
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499 | Console_Port_Data[minor].termios_data, 1)) { |
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500 | if (Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
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501 | ns16550_negate_RTS(minor); |
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502 | } |
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503 | Console_Port_Data[minor].bActive = FALSE; |
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504 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR_EXCEPT_TX); |
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505 | break; |
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506 | } |
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507 | |
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508 | ucInterruptId = (*getReg)(pNS16550, NS16550_INTERRUPT_ID); |
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509 | } |
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510 | } while((ucInterruptId&0xf)!=0x1); |
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511 | } |
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512 | |
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513 | /* |
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514 | * ns16550_isr |
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515 | */ |
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516 | |
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517 | NS16550_STATIC rtems_isr ns16550_isr( |
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518 | rtems_vector_number vector |
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519 | ) |
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520 | { |
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521 | int minor; |
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522 | |
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523 | for(minor=0;minor<Console_Port_Count;minor++) { |
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524 | if(Console_Port_Tbl[minor].ulIntVector == vector && |
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525 | Console_Port_Tbl[minor].deviceType == SERIAL_NS16550 ) { |
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526 | ns16550_process(minor); |
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527 | } |
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528 | } |
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529 | } |
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530 | |
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531 | /* |
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532 | * ns16550_enable_interrupts |
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533 | * |
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534 | * This routine initializes the port to have the specified interrupts masked. |
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535 | */ |
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536 | |
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537 | NS16550_STATIC void ns16550_enable_interrupts( |
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538 | int minor, |
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539 | int mask |
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540 | ) |
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541 | { |
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542 | unsigned32 pNS16550; |
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543 | setRegister_f setReg; |
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544 | |
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545 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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546 | setReg = Console_Port_Tbl[minor].setRegister; |
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547 | |
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548 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, mask); |
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549 | } |
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550 | |
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551 | /* |
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552 | * ns16550_initialize_interrupts |
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553 | * |
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554 | * This routine initializes the port to operate in interrupt driver mode. |
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555 | */ |
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556 | |
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557 | NS16550_STATIC void ns16550_initialize_interrupts(int minor) |
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558 | { |
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559 | ns16550_init(minor); |
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560 | |
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561 | Console_Port_Data[minor].bActive = FALSE; |
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562 | |
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563 | set_vector(ns16550_isr, Console_Port_Tbl[minor].ulIntVector, 1); |
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564 | |
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565 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR); |
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566 | } |
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567 | |
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568 | /* |
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569 | * ns16550_write_support_int |
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570 | * |
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571 | * Console Termios output entry point. |
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572 | */ |
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573 | |
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574 | NS16550_STATIC int ns16550_write_support_int( |
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575 | int minor, |
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576 | const char *buf, |
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577 | int len |
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578 | ) |
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579 | { |
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580 | unsigned32 Irql; |
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581 | unsigned32 pNS16550; |
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582 | setRegister_f setReg; |
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583 | |
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584 | setReg = Console_Port_Tbl[minor].setRegister; |
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585 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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586 | |
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587 | /* |
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588 | * We are using interrupt driven output and termios only sends us |
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589 | * one character at a time. |
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590 | */ |
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591 | |
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592 | if ( !len ) |
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593 | return 0; |
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594 | |
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595 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
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596 | ns16550_assert_RTS(minor); |
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597 | } |
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598 | |
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599 | rtems_interrupt_disable(Irql); |
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600 | if ( Console_Port_Data[minor].bActive == FALSE) { |
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601 | Console_Port_Data[minor].bActive = TRUE; |
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602 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR); |
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603 | } |
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604 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, *buf); |
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605 | rtems_interrupt_enable(Irql); |
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606 | |
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607 | return 1; |
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608 | } |
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609 | |
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610 | /* |
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611 | * ns16550_write_support_polled |
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612 | * |
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613 | * Console Termios output entry point. |
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614 | * |
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615 | */ |
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616 | |
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617 | NS16550_STATIC int ns16550_write_support_polled( |
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618 | int minor, |
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619 | const char *buf, |
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620 | int len |
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621 | ) |
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622 | { |
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623 | int nwrite = 0; |
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624 | |
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625 | /* |
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626 | * poll each byte in the string out of the port. |
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627 | */ |
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628 | while (nwrite < len) { |
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629 | /* |
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630 | * transmit character |
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631 | */ |
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632 | ns16550_write_polled(minor, *buf++); |
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633 | nwrite++; |
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634 | } |
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635 | |
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636 | /* |
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637 | * return the number of bytes written. |
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638 | */ |
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639 | return nwrite; |
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640 | } |
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641 | |
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642 | /* |
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643 | * ns16550_inbyte_nonblocking_polled |
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644 | * |
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645 | * Console Termios polling input entry point. |
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646 | */ |
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647 | |
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648 | NS16550_STATIC int ns16550_inbyte_nonblocking_polled( |
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649 | int minor |
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650 | ) |
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651 | { |
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652 | unsigned32 pNS16550; |
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653 | unsigned char ucLineStatus; |
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654 | char cChar; |
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655 | getRegister_f getReg; |
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656 | |
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657 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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658 | getReg = Console_Port_Tbl[minor].getRegister; |
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659 | |
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660 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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661 | if(ucLineStatus & SP_LSR_RDY) { |
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662 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
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663 | return (int)cChar; |
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664 | } else { |
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665 | return -1; |
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666 | } |
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667 | } |
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