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((unsigned32)Console_Port_Tbl[minor].pDeviceParams); |
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106 | ucDataByte = SP_LINE_DLAB; |
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107 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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108 | |
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109 | /* XXX */ |
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110 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, ulBaudDivisor&0xff); |
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111 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, (ulBaudDivisor>>8)&0xff); |
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112 | |
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113 | /* Clear the divisor latch and set the character size to eight bits */ |
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114 | /* with one stop bit and no parity checking. */ |
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115 | ucDataByte = EIGHT_BITS; |
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116 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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117 | |
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118 | /* Enable and reset transmit and receive FIFOs. TJA */ |
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119 | ucDataByte = SP_FIFO_ENABLE; |
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120 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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121 | |
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122 | ucDataByte = SP_FIFO_ENABLE | SP_FIFO_RXRST | SP_FIFO_TXRST; |
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123 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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124 | |
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125 | ns16550_enable_interrupts(minor, NS16550_DISABLE_ALL_INTR); |
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126 | |
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127 | /* Set data terminal ready. */ |
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128 | /* And open interrupt tristate line */ |
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129 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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130 | |
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131 | ucTrash = (*getReg)(pNS16550, NS16550_LINE_STATUS ); |
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132 | ucTrash = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER ); |
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133 | } |
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134 | |
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135 | /* |
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136 | * ns16550_open |
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137 | */ |
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138 | |
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139 | NS16550_STATIC int ns16550_open( |
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140 | int major, |
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141 | int minor, |
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142 | void * arg |
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143 | ) |
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144 | { |
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145 | /* |
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146 | * Assert DTR |
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147 | */ |
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148 | |
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149 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_DTRCTS) { |
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150 | ns16550_assert_DTR(minor); |
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151 | } |
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152 | |
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153 | return(RTEMS_SUCCESSFUL); |
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154 | } |
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155 | |
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156 | /* |
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157 | * ns16550_close |
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158 | */ |
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159 | |
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160 | NS16550_STATIC int ns16550_close( |
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161 | int major, |
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162 | int minor, |
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163 | void * arg |
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164 | ) |
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165 | { |
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166 | /* |
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167 | * Negate DTR |
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168 | */ |
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169 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_DTRCTS) { |
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170 | ns16550_negate_DTR(minor); |
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171 | } |
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172 | |
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173 | return(RTEMS_SUCCESSFUL); |
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174 | } |
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175 | |
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176 | /* |
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177 | * ns16550_write_polled |
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178 | */ |
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179 | |
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180 | NS16550_STATIC void ns16550_write_polled( |
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181 | int minor, |
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182 | char cChar |
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183 | ) |
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184 | { |
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185 | unsigned32 pNS16550; |
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186 | unsigned char ucLineStatus; |
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187 | int iTimeout; |
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188 | getRegister_f getReg; |
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189 | setRegister_f setReg; |
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190 | |
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191 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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192 | getReg = Console_Port_Tbl[minor].getRegister; |
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193 | setReg = Console_Port_Tbl[minor].setRegister; |
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194 | |
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195 | /* |
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196 | * wait for transmitter holding register to be empty |
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197 | */ |
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198 | iTimeout=1000; |
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199 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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200 | while ((ucLineStatus & SP_LSR_THOLD) == 0) { |
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201 | /* |
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202 | * Yield while we wait |
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203 | */ |
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204 | #if 0 |
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205 | if(_System_state_Is_up(_System_state_Get())) { |
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206 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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207 | } |
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208 | #endif |
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209 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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210 | if(!--iTimeout) { |
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211 | break; |
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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 | * transmit character |
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217 | */ |
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218 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, cChar); |
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219 | } |
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220 | |
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221 | /* |
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222 | * These routines provide control of the RTS and DTR lines |
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223 | */ |
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224 | |
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225 | /* |
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226 | * ns16550_assert_RTS |
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227 | */ |
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228 | |
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229 | NS16550_STATIC int ns16550_assert_RTS(int minor) |
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230 | { |
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231 | unsigned32 pNS16550; |
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232 | unsigned32 Irql; |
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233 | ns16550_context *pns16550Context; |
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234 | setRegister_f setReg; |
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235 | |
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236 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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237 | |
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238 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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239 | setReg = Console_Port_Tbl[minor].setRegister; |
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240 | |
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241 | /* |
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242 | * Assert RTS |
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243 | */ |
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244 | rtems_interrupt_disable(Irql); |
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245 | pns16550Context->ucModemCtrl|=SP_MODEM_RTS; |
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246 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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247 | rtems_interrupt_enable(Irql); |
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248 | return 0; |
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249 | } |
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250 | |
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251 | /* |
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252 | * ns16550_negate_RTS |
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253 | */ |
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254 | |
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255 | NS16550_STATIC int ns16550_negate_RTS(int minor) |
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256 | { |
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257 | unsigned32 pNS16550; |
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258 | unsigned32 Irql; |
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259 | ns16550_context *pns16550Context; |
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260 | setRegister_f setReg; |
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261 | |
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262 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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263 | |
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264 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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265 | setReg = Console_Port_Tbl[minor].setRegister; |
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266 | |
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267 | /* |
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268 | * Negate RTS |
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269 | */ |
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270 | rtems_interrupt_disable(Irql); |
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271 | pns16550Context->ucModemCtrl&=~SP_MODEM_RTS; |
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272 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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273 | rtems_interrupt_enable(Irql); |
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274 | return 0; |
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275 | } |
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276 | |
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277 | /* |
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278 | * These flow control routines utilise a connection from the local DTR |
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279 | * line to the remote CTS line |
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280 | */ |
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281 | |
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282 | /* |
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283 | * ns16550_assert_DTR |
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284 | */ |
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285 | |
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286 | NS16550_STATIC int ns16550_assert_DTR(int minor) |
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287 | { |
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288 | unsigned32 pNS16550; |
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289 | unsigned32 Irql; |
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290 | ns16550_context *pns16550Context; |
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291 | setRegister_f setReg; |
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292 | |
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293 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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294 | |
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295 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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296 | setReg = Console_Port_Tbl[minor].setRegister; |
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297 | |
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298 | /* |
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299 | * Assert DTR |
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300 | */ |
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301 | rtems_interrupt_disable(Irql); |
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302 | pns16550Context->ucModemCtrl|=SP_MODEM_DTR; |
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303 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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304 | rtems_interrupt_enable(Irql); |
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305 | return 0; |
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306 | } |
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307 | |
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308 | /* |
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309 | * ns16550_negate_DTR |
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310 | */ |
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311 | |
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312 | NS16550_STATIC int ns16550_negate_DTR(int minor) |
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313 | { |
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314 | unsigned32 pNS16550; |
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315 | unsigned32 Irql; |
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316 | ns16550_context *pns16550Context; |
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317 | setRegister_f setReg; |
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318 | |
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319 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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320 | |
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321 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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322 | setReg = Console_Port_Tbl[minor].setRegister; |
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323 | |
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324 | /* |
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325 | * Negate DTR |
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326 | */ |
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327 | rtems_interrupt_disable(Irql); |
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328 | pns16550Context->ucModemCtrl&=~SP_MODEM_DTR; |
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329 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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330 | rtems_interrupt_enable(Irql); |
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331 | return 0; |
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332 | } |
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333 | |
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334 | /* |
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335 | * ns16550_set_attributes |
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336 | * |
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337 | * This function sets the channel to reflect the requested termios |
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338 | * port settings. |
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339 | */ |
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340 | |
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341 | NS16550_STATIC int ns16550_set_attributes( |
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342 | int minor, |
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343 | const struct termios *t |
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344 | ) |
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345 | { |
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346 | unsigned32 pNS16550; |
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347 | unsigned32 ulBaudDivisor; |
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348 | unsigned8 ucLineControl; |
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349 | unsigned32 baud_requested; |
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350 | setRegister_f setReg; |
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351 | getRegister_f getReg; |
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352 | unsigned32 Irql; |
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353 | |
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354 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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355 | setReg = Console_Port_Tbl[minor].setRegister; |
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356 | getReg = Console_Port_Tbl[minor].getRegister; |
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357 | |
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358 | /* |
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359 | * Calculate the baud rate divisor |
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360 | */ |
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361 | |
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362 | baud_requested = t->c_cflag & CBAUD; |
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363 | if (!baud_requested) |
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364 | baud_requested = B9600; /* default to 9600 baud */ |
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365 | |
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366 | ulBaudDivisor = termios_baud_to_number(baud_requested); |
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367 | |
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368 | ucLineControl = 0; |
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369 | |
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370 | /* |
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371 | * Parity |
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372 | */ |
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373 | |
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374 | if (t->c_cflag & PARENB) { |
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375 | ucLineControl |= SP_LINE_PAR; |
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376 | if (!(t->c_cflag & PARODD)) |
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377 | ucLineControl |= SP_LINE_ODD; |
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378 | } |
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379 | |
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380 | /* |
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381 | * Character Size |
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382 | */ |
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383 | |
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384 | if (t->c_cflag & CSIZE) { |
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385 | switch (t->c_cflag & CSIZE) { |
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386 | case CS5: ucLineControl |= FIVE_BITS; break; |
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387 | case CS6: ucLineControl |= SIX_BITS; break; |
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388 | case CS7: ucLineControl |= SEVEN_BITS; break; |
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389 | case CS8: ucLineControl |= EIGHT_BITS; break; |
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390 | } |
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391 | } else { |
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392 | ucLineControl |= EIGHT_BITS; /* default to 9600,8,N,1 */ |
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393 | } |
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394 | |
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395 | /* |
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396 | * Stop Bits |
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397 | */ |
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398 | |
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399 | if (t->c_cflag & CSTOPB) { |
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400 | ucLineControl |= SP_LINE_STOP; /* 2 stop bits */ |
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401 | } else { |
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402 | ; /* 1 stop bit */ |
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403 | } |
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404 | |
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405 | /* |
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406 | * Now actually set the chip |
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407 | */ |
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408 | |
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409 | rtems_interrupt_disable(Irql); |
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410 | |
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411 | /* |
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412 | * Set the baud rate |
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413 | */ |
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414 | |
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415 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, SP_LINE_DLAB); |
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416 | /* XXX are these registers right? */ |
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417 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, ulBaudDivisor&0xff); |
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418 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, (ulBaudDivisor>>8)&0xff); |
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419 | |
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420 | /* |
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421 | * Now write the line control |
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422 | */ |
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423 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucLineControl ); |
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424 | |
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425 | rtems_interrupt_enable(Irql); |
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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 | * ns16550_process |
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431 | * |
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432 | * This routine is the console interrupt handler for A port. |
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433 | */ |
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434 | |
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435 | NS16550_STATIC void ns16550_process( |
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436 | int minor |
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437 | ) |
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438 | { |
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439 | unsigned32 pNS16550; |
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440 | volatile unsigned8 ucLineStatus; |
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441 | volatile unsigned8 ucInterruptId; |
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442 | unsigned char cChar; |
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443 | getRegister_f getReg; |
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444 | setRegister_f setReg; |
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445 | |
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446 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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447 | getReg = Console_Port_Tbl[minor].getRegister; |
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448 | setReg = Console_Port_Tbl[minor].setRegister; |
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449 | |
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450 | do { |
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451 | /* |
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452 | * Deal with any received characters |
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453 | */ |
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454 | while(TRUE) { |
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455 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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456 | if(~ucLineStatus & SP_LSR_RDY) { |
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457 | break; |
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458 | } |
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459 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
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460 | rtems_termios_enqueue_raw_characters( |
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461 | Console_Port_Data[minor].termios_data, |
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462 | &cChar, |
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463 | 1 |
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464 | ); |
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465 | } |
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466 | |
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467 | /* |
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468 | * TX all the characters we can |
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469 | */ |
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470 | |
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471 | while(TRUE) { |
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472 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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473 | if(~ucLineStatus & SP_LSR_THOLD) { |
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474 | /* |
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475 | * We'll get another interrupt when |
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476 | * the transmitter holding reg. becomes |
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477 | * free again |
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478 | */ |
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479 | break; |
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480 | } |
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481 | |
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482 | #if 0 |
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483 | /* XXX flow control not completely supported in libchip */ |
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484 | |
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485 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
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486 | ns16550_negate_RTS(minor); |
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487 | } |
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488 | #endif |
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489 | |
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490 | rtems_termios_dequeue_characters(Console_Port_Data[minor].termios_data, 1); |
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491 | if (rtems_termios_dequeue_characters( |
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492 | Console_Port_Data[minor].termios_data, 1)) { |
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493 | if (Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
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494 | ns16550_negate_RTS(minor); |
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495 | } |
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496 | Console_Port_Data[minor].bActive = FALSE; |
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497 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR_EXCEPT_TX); |
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498 | break; |
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499 | } |
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500 | |
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501 | ucInterruptId = (*getReg)(pNS16550, NS16550_INTERRUPT_ID); |
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502 | } |
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503 | } while((ucInterruptId&0xf)!=0x1); |
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504 | } |
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505 | |
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506 | /* |
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507 | * ns16550_isr |
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508 | */ |
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509 | |
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510 | NS16550_STATIC rtems_isr ns16550_isr( |
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511 | rtems_vector_number vector |
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512 | ) |
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513 | { |
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514 | int minor; |
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515 | |
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516 | for(minor=0;minor<Console_Port_Count;minor++) { |
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517 | if(Console_Port_Tbl[minor].ulIntVector == vector && |
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518 | Console_Port_Tbl[minor].deviceType == SERIAL_NS16550 ) { |
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519 | ns16550_process(minor); |
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520 | } |
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521 | } |
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522 | } |
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523 | |
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524 | /* |
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525 | * ns16550_enable_interrupts |
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526 | * |
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527 | * This routine initializes the port to have the specified interrupts masked. |
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528 | */ |
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529 | |
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530 | NS16550_STATIC void ns16550_enable_interrupts( |
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531 | int minor, |
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532 | int mask |
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533 | ) |
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534 | { |
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535 | unsigned32 pNS16550; |
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536 | setRegister_f setReg; |
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537 | |
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538 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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539 | setReg = Console_Port_Tbl[minor].setRegister; |
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540 | |
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541 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, mask); |
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542 | } |
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543 | |
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544 | /* |
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545 | * ns16550_initialize_interrupts |
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546 | * |
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547 | * This routine initializes the port to operate in interrupt driver mode. |
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548 | */ |
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549 | |
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550 | NS16550_STATIC void ns16550_initialize_interrupts(int minor) |
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551 | { |
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552 | ns16550_init(minor); |
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553 | |
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554 | Console_Port_Data[minor].bActive = FALSE; |
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555 | |
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556 | set_vector(ns16550_isr, Console_Port_Tbl[minor].ulIntVector, 1); |
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557 | |
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558 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR); |
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559 | } |
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560 | |
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561 | /* |
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562 | * ns16550_write_support_int |
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563 | * |
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564 | * Console Termios output entry point. |
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565 | */ |
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566 | |
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567 | NS16550_STATIC int ns16550_write_support_int( |
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568 | int minor, |
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569 | const char *buf, |
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570 | int len |
---|
571 | ) |
---|
572 | { |
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573 | unsigned32 Irql; |
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574 | unsigned32 pNS16550; |
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575 | setRegister_f setReg; |
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576 | |
---|
577 | setReg = Console_Port_Tbl[minor].setRegister; |
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578 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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579 | |
---|
580 | /* |
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581 | * We are using interrupt driven output and termios only sends us |
---|
582 | * one character at a time. |
---|
583 | */ |
---|
584 | |
---|
585 | if ( !len ) |
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586 | return 0; |
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587 | |
---|
588 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
---|
589 | ns16550_assert_RTS(minor); |
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590 | } |
---|
591 | |
---|
592 | rtems_interrupt_disable(Irql); |
---|
593 | if ( Console_Port_Data[minor].bActive == FALSE) { |
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594 | Console_Port_Data[minor].bActive = TRUE; |
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595 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR); |
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596 | } |
---|
597 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, *buf); |
---|
598 | rtems_interrupt_enable(Irql); |
---|
599 | |
---|
600 | return 1; |
---|
601 | } |
---|
602 | |
---|
603 | /* |
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604 | * ns16550_write_support_polled |
---|
605 | * |
---|
606 | * Console Termios output entry point. |
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607 | * |
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608 | */ |
---|
609 | |
---|
610 | NS16550_STATIC int ns16550_write_support_polled( |
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611 | int minor, |
---|
612 | const char *buf, |
---|
613 | int len |
---|
614 | ) |
---|
615 | { |
---|
616 | int nwrite = 0; |
---|
617 | |
---|
618 | /* |
---|
619 | * poll each byte in the string out of the port. |
---|
620 | */ |
---|
621 | while (nwrite < len) { |
---|
622 | /* |
---|
623 | * transmit character |
---|
624 | */ |
---|
625 | ns16550_write_polled(minor, *buf++); |
---|
626 | nwrite++; |
---|
627 | } |
---|
628 | |
---|
629 | /* |
---|
630 | * return the number of bytes written. |
---|
631 | */ |
---|
632 | return nwrite; |
---|
633 | } |
---|
634 | |
---|
635 | /* |
---|
636 | * ns16550_inbyte_nonblocking_polled |
---|
637 | * |
---|
638 | * Console Termios polling input entry point. |
---|
639 | */ |
---|
640 | |
---|
641 | NS16550_STATIC int ns16550_inbyte_nonblocking_polled( |
---|
642 | int minor |
---|
643 | ) |
---|
644 | { |
---|
645 | unsigned32 pNS16550; |
---|
646 | unsigned char ucLineStatus; |
---|
647 | char cChar; |
---|
648 | getRegister_f getReg; |
---|
649 | |
---|
650 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
651 | getReg = Console_Port_Tbl[minor].getRegister; |
---|
652 | |
---|
653 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
---|
654 | if(ucLineStatus & SP_LSR_RDY) { |
---|
655 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
---|
656 | return (int)cChar; |
---|
657 | } else { |
---|
658 | return -1; |
---|
659 | } |
---|
660 | } |
---|