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 <stdlib.h> |
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24 | |
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25 | #include <rtems.h> |
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26 | #include <rtems/libio.h> |
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27 | #include <rtems/ringbuf.h> |
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28 | #include <rtems/bspIo.h> |
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29 | |
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30 | #include <libchip/serial.h> |
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31 | #include <libchip/sersupp.h> |
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32 | |
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33 | #include <bsp.h> |
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34 | |
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35 | #include "ns16550_p.h" |
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36 | |
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37 | #ifdef BSP_FEATURE_IRQ_EXTENSION |
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38 | #include <bsp/irq.h> |
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39 | #elif defined BSP_FEATURE_IRQ_LEGACY |
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40 | #include <bsp/irq.h> |
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41 | #elif defined __PPC__ |
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42 | #include <bsp/irq.h> |
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43 | #define BSP_FEATURE_IRQ_LEGACY |
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44 | #ifdef BSP_SHARED_HANDLER_SUPPORT |
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45 | #define BSP_FEATURE_IRQ_LEGACY_SHARED_HANDLER_SUPPORT |
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46 | #endif |
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47 | #endif |
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48 | |
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49 | /* |
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50 | * Flow control is only supported when using interrupts |
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51 | */ |
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52 | |
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53 | console_flow ns16550_flow_RTSCTS = { |
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54 | ns16550_negate_RTS, /* deviceStopRemoteTx */ |
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55 | ns16550_assert_RTS /* deviceStartRemoteTx */ |
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56 | }; |
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57 | |
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58 | console_flow ns16550_flow_DTRCTS = { |
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59 | ns16550_negate_DTR, /* deviceStopRemoteTx */ |
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60 | ns16550_assert_DTR /* deviceStartRemoteTx */ |
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61 | }; |
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62 | |
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63 | console_fns ns16550_fns = { |
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64 | libchip_serial_default_probe, /* deviceProbe */ |
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65 | ns16550_open, /* deviceFirstOpen */ |
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66 | NULL, /* deviceLastClose */ |
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67 | NULL, /* deviceRead */ |
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68 | ns16550_write_support_int, /* deviceWrite */ |
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69 | ns16550_initialize_interrupts, /* deviceInitialize */ |
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70 | ns16550_write_polled, /* deviceWritePolled */ |
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71 | ns16550_set_attributes, /* deviceSetAttributes */ |
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72 | true /* deviceOutputUsesInterrupts */ |
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73 | }; |
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74 | |
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75 | console_fns ns16550_fns_polled = { |
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76 | libchip_serial_default_probe, /* deviceProbe */ |
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77 | ns16550_open, /* deviceFirstOpen */ |
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78 | ns16550_close, /* deviceLastClose */ |
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79 | ns16550_inbyte_nonblocking_polled, /* deviceRead */ |
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80 | ns16550_write_support_polled, /* deviceWrite */ |
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81 | ns16550_init, /* deviceInitialize */ |
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82 | ns16550_write_polled, /* deviceWritePolled */ |
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83 | ns16550_set_attributes, /* deviceSetAttributes */ |
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84 | false /* deviceOutputUsesInterrupts */ |
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85 | }; |
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86 | |
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87 | /* |
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88 | * ns16550_init |
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89 | */ |
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90 | |
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91 | NS16550_STATIC void ns16550_init(int minor) |
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92 | { |
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93 | uint32_t pNS16550; |
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94 | uint8_t ucTrash; |
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95 | uint8_t ucDataByte; |
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96 | uint32_t ulBaudDivisor; |
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97 | ns16550_context *pns16550Context; |
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98 | setRegister_f setReg; |
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99 | getRegister_f getReg; |
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100 | |
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101 | pns16550Context=(ns16550_context *)malloc(sizeof(ns16550_context)); |
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102 | |
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103 | if (pns16550Context == NULL) { |
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104 | printk( "%s: Error: Not enough memory\n", __func__); |
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105 | rtems_fatal_error_occurred( 0xdeadbeef); |
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106 | } |
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107 | |
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108 | Console_Port_Data[minor].pDeviceContext=(void *)pns16550Context; |
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109 | pns16550Context->ucModemCtrl=SP_MODEM_IRQ; |
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110 | |
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111 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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112 | setReg = Console_Port_Tbl[minor].setRegister; |
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113 | getReg = Console_Port_Tbl[minor].getRegister; |
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114 | |
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115 | /* Clear the divisor latch, clear all interrupt enables, |
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116 | * and reset and |
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117 | * disable the FIFO's. |
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118 | */ |
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119 | |
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120 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, 0x0); |
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121 | ns16550_enable_interrupts(minor, NS16550_DISABLE_ALL_INTR); |
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122 | |
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123 | /* Set the divisor latch and set the baud rate. */ |
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124 | |
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125 | ulBaudDivisor = NS16550_Baud( |
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126 | (uint32_t) Console_Port_Tbl[minor].ulClock, |
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127 | (uint32_t) Console_Port_Tbl[minor].pDeviceParams |
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128 | ); |
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129 | ucDataByte = SP_LINE_DLAB; |
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130 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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131 | |
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132 | /* XXX */ |
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133 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, (uint8_t) (ulBaudDivisor & 0xffU)); |
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134 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, (uint8_t) ((ulBaudDivisor >> 8) & 0xffU)); |
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135 | |
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136 | /* Clear the divisor latch and set the character size to eight bits */ |
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137 | /* with one stop bit and no parity checking. */ |
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138 | ucDataByte = EIGHT_BITS; |
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139 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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140 | |
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141 | /* Enable and reset transmit and receive FIFOs. TJA */ |
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142 | ucDataByte = SP_FIFO_ENABLE; |
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143 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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144 | |
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145 | ucDataByte = SP_FIFO_ENABLE | SP_FIFO_RXRST | SP_FIFO_TXRST; |
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146 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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147 | |
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148 | ns16550_enable_interrupts(minor, NS16550_DISABLE_ALL_INTR); |
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149 | |
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150 | /* Set data terminal ready. */ |
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151 | /* And open interrupt tristate line */ |
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152 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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153 | |
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154 | ucTrash = (*getReg)(pNS16550, NS16550_LINE_STATUS ); |
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155 | ucTrash = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER ); |
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156 | } |
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157 | |
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158 | /* |
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159 | * ns16550_open |
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160 | */ |
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161 | |
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162 | NS16550_STATIC int ns16550_open( |
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163 | int major, |
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164 | int minor, |
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165 | void * arg |
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166 | ) |
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167 | { |
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168 | /* |
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169 | * Assert DTR |
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170 | */ |
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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_assert_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_close |
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181 | */ |
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182 | |
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183 | NS16550_STATIC int ns16550_close( |
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184 | int major, |
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185 | int minor, |
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186 | void * arg |
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187 | ) |
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188 | { |
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189 | /* |
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190 | * Negate DTR |
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191 | */ |
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192 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_DTRCTS) { |
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193 | ns16550_negate_DTR(minor); |
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194 | } |
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195 | |
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196 | return(RTEMS_SUCCESSFUL); |
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197 | } |
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198 | |
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199 | /** |
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200 | * @brief Polled write for NS16550. |
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201 | */ |
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202 | NS16550_STATIC void ns16550_write_polled( int minor, char c) |
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203 | { |
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204 | uint32_t port = Console_Port_Tbl [minor].ulCtrlPort1; |
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205 | getRegister_f get = Console_Port_Tbl [minor].getRegister; |
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206 | setRegister_f set = Console_Port_Tbl [minor].setRegister; |
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207 | uint32_t status; |
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208 | rtems_interrupt_level level; |
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209 | |
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210 | while (1) { |
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211 | /* Try to transmit the character in a critical section */ |
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212 | rtems_interrupt_disable( level); |
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213 | |
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214 | /* Read the transmitter holding register and check it */ |
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215 | status = get( port, NS16550_LINE_STATUS); |
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216 | if ((status & SP_LSR_THOLD) != 0) { |
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217 | /* Transmit character */ |
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218 | set( port, NS16550_TRANSMIT_BUFFER, c); |
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219 | |
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220 | /* Finished */ |
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221 | rtems_interrupt_enable( level); |
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222 | break; |
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223 | } else { |
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224 | rtems_interrupt_enable( level); |
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225 | } |
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226 | |
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227 | /* Wait for transmitter holding register to be empty */ |
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228 | do { |
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229 | status = get( port, NS16550_LINE_STATUS); |
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230 | } while ((status & SP_LSR_THOLD) == 0); |
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231 | } |
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232 | } |
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233 | |
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234 | /* |
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235 | * These routines provide control of the RTS and DTR lines |
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236 | */ |
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237 | |
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238 | /* |
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239 | * ns16550_assert_RTS |
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240 | */ |
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241 | |
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242 | NS16550_STATIC int ns16550_assert_RTS(int minor) |
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243 | { |
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244 | uint32_t pNS16550; |
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245 | uint32_t Irql; |
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246 | ns16550_context *pns16550Context; |
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247 | setRegister_f setReg; |
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248 | |
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249 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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250 | |
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251 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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252 | setReg = Console_Port_Tbl[minor].setRegister; |
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253 | |
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254 | /* |
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255 | * Assert RTS |
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256 | */ |
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257 | rtems_interrupt_disable(Irql); |
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258 | pns16550Context->ucModemCtrl|=SP_MODEM_RTS; |
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259 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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260 | rtems_interrupt_enable(Irql); |
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261 | return 0; |
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262 | } |
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263 | |
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264 | /* |
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265 | * ns16550_negate_RTS |
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266 | */ |
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267 | |
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268 | NS16550_STATIC int ns16550_negate_RTS(int minor) |
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269 | { |
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270 | uint32_t pNS16550; |
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271 | uint32_t Irql; |
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272 | ns16550_context *pns16550Context; |
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273 | setRegister_f setReg; |
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274 | |
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275 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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276 | |
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277 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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278 | setReg = Console_Port_Tbl[minor].setRegister; |
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279 | |
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280 | /* |
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281 | * Negate RTS |
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282 | */ |
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283 | rtems_interrupt_disable(Irql); |
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284 | pns16550Context->ucModemCtrl&=~SP_MODEM_RTS; |
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285 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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286 | rtems_interrupt_enable(Irql); |
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287 | return 0; |
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288 | } |
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289 | |
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290 | /* |
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291 | * These flow control routines utilise a connection from the local DTR |
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292 | * line to the remote CTS line |
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293 | */ |
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294 | |
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295 | /* |
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296 | * ns16550_assert_DTR |
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297 | */ |
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298 | |
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299 | NS16550_STATIC int ns16550_assert_DTR(int minor) |
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300 | { |
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301 | uint32_t pNS16550; |
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302 | uint32_t Irql; |
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303 | ns16550_context *pns16550Context; |
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304 | setRegister_f setReg; |
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305 | |
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306 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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307 | |
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308 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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309 | setReg = Console_Port_Tbl[minor].setRegister; |
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310 | |
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311 | /* |
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312 | * Assert DTR |
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313 | */ |
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314 | rtems_interrupt_disable(Irql); |
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315 | pns16550Context->ucModemCtrl|=SP_MODEM_DTR; |
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316 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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317 | rtems_interrupt_enable(Irql); |
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318 | return 0; |
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319 | } |
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320 | |
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321 | /* |
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322 | * ns16550_negate_DTR |
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323 | */ |
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324 | |
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325 | NS16550_STATIC int ns16550_negate_DTR(int minor) |
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326 | { |
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327 | uint32_t pNS16550; |
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328 | uint32_t Irql; |
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329 | ns16550_context *pns16550Context; |
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330 | setRegister_f setReg; |
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331 | |
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332 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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333 | |
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334 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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335 | setReg = Console_Port_Tbl[minor].setRegister; |
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336 | |
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337 | /* |
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338 | * Negate DTR |
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339 | */ |
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340 | rtems_interrupt_disable(Irql); |
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341 | pns16550Context->ucModemCtrl&=~SP_MODEM_DTR; |
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342 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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343 | rtems_interrupt_enable(Irql); |
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344 | return 0; |
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345 | } |
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346 | |
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347 | /* |
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348 | * ns16550_set_attributes |
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349 | * |
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350 | * This function sets the channel to reflect the requested termios |
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351 | * port settings. |
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352 | */ |
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353 | |
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354 | NS16550_STATIC int ns16550_set_attributes( |
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355 | int minor, |
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356 | const struct termios *t |
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357 | ) |
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358 | { |
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359 | uint32_t pNS16550; |
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360 | uint32_t ulBaudDivisor; |
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361 | uint8_t ucLineControl; |
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362 | uint32_t baud_requested; |
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363 | setRegister_f setReg; |
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364 | getRegister_f getReg; |
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365 | uint32_t Irql; |
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366 | |
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367 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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368 | setReg = Console_Port_Tbl[minor].setRegister; |
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369 | getReg = Console_Port_Tbl[minor].getRegister; |
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370 | |
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371 | /* |
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372 | * Calculate the baud rate divisor |
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373 | */ |
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374 | |
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375 | baud_requested = t->c_cflag & CBAUD; |
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376 | if (!baud_requested) |
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377 | baud_requested = B9600; /* default to 9600 baud */ |
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378 | |
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379 | ulBaudDivisor = NS16550_Baud( |
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380 | (uint32_t) Console_Port_Tbl[minor].ulClock, |
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381 | termios_baud_to_number(baud_requested) |
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382 | ); |
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383 | |
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384 | ucLineControl = 0; |
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385 | |
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386 | /* |
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387 | * Parity |
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388 | */ |
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389 | |
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390 | if (t->c_cflag & PARENB) { |
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391 | ucLineControl |= SP_LINE_PAR; |
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392 | if (!(t->c_cflag & PARODD)) |
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393 | ucLineControl |= SP_LINE_ODD; |
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394 | } |
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395 | |
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396 | /* |
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397 | * Character Size |
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398 | */ |
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399 | |
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400 | if (t->c_cflag & CSIZE) { |
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401 | switch (t->c_cflag & CSIZE) { |
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402 | case CS5: ucLineControl |= FIVE_BITS; break; |
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403 | case CS6: ucLineControl |= SIX_BITS; break; |
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404 | case CS7: ucLineControl |= SEVEN_BITS; break; |
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405 | case CS8: ucLineControl |= EIGHT_BITS; break; |
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406 | } |
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407 | } else { |
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408 | ucLineControl |= EIGHT_BITS; /* default to 9600,8,N,1 */ |
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409 | } |
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410 | |
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411 | /* |
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412 | * Stop Bits |
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413 | */ |
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414 | |
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415 | if (t->c_cflag & CSTOPB) { |
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416 | ucLineControl |= SP_LINE_STOP; /* 2 stop bits */ |
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417 | } else { |
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418 | ; /* 1 stop bit */ |
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419 | } |
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420 | |
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421 | /* |
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422 | * Now actually set the chip |
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423 | */ |
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424 | |
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425 | rtems_interrupt_disable(Irql); |
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426 | |
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427 | /* |
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428 | * Set the baud rate |
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429 | */ |
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430 | |
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431 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, SP_LINE_DLAB); |
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432 | /* XXX are these registers right? */ |
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433 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, ulBaudDivisor&0xff); |
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434 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, (ulBaudDivisor>>8)&0xff); |
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435 | |
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436 | /* |
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437 | * Now write the line control |
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438 | */ |
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439 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucLineControl ); |
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440 | |
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441 | rtems_interrupt_enable(Irql); |
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442 | |
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443 | return 0; |
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444 | } |
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445 | |
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446 | /* |
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447 | * ns16550_process |
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448 | * |
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449 | * This routine is the console interrupt handler for A port. |
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450 | */ |
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451 | |
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452 | NS16550_STATIC void ns16550_process( int minor) |
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453 | { |
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454 | console_tbl *c = &Console_Port_Tbl [minor]; |
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455 | console_data *d = &Console_Port_Data [minor]; |
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456 | |
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457 | uint32_t pNS16550; |
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458 | volatile uint8_t ucLineStatus; |
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459 | volatile uint8_t ucInterruptId; |
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460 | char cChar; |
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461 | getRegister_f getReg; |
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462 | setRegister_f setReg; |
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463 | |
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464 | pNS16550 = c->ulCtrlPort1; |
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465 | getReg = c->getRegister; |
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466 | setReg = c->setRegister; |
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467 | |
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468 | do { |
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469 | /* |
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470 | * Deal with any received characters |
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471 | */ |
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472 | while (true) { |
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473 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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474 | if (~ucLineStatus & SP_LSR_RDY) { |
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475 | break; |
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476 | } |
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477 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
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478 | rtems_termios_enqueue_raw_characters( |
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479 | d->termios_data, |
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480 | &cChar, |
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481 | 1 |
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482 | ); |
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483 | } |
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484 | |
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485 | /* |
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486 | * TX all the characters we can |
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487 | */ |
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488 | |
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489 | while (true) { |
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490 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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491 | if (~ucLineStatus & SP_LSR_THOLD) { |
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492 | /* |
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493 | * We'll get another interrupt when |
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494 | * the transmitter holding reg. becomes |
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495 | * free again |
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496 | */ |
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497 | break; |
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498 | } |
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499 | |
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500 | if (rtems_termios_dequeue_characters( d->termios_data, 1) == 0) { |
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501 | if (c->pDeviceFlow != &ns16550_flow_RTSCTS) { |
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502 | ns16550_negate_RTS(minor); |
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503 | } |
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504 | d->bActive = false; |
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505 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR_EXCEPT_TX); |
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506 | break; |
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507 | } |
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508 | } |
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509 | |
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510 | ucInterruptId = (*getReg)(pNS16550, NS16550_INTERRUPT_ID); |
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511 | } while((ucInterruptId&0xf)!=0x1); |
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512 | } |
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513 | |
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514 | /* |
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515 | * ns16550_enable_interrupts |
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516 | * |
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517 | * This routine initializes the port to have the specified interrupts masked. |
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518 | */ |
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519 | |
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520 | NS16550_STATIC void ns16550_enable_interrupts( |
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521 | int minor, |
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522 | int mask |
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523 | ) |
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524 | { |
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525 | uint32_t pNS16550; |
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526 | setRegister_f setReg; |
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527 | |
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528 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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529 | setReg = Console_Port_Tbl[minor].setRegister; |
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530 | |
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531 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, mask); |
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532 | } |
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533 | |
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534 | #ifdef BSP_FEATURE_IRQ_EXTENSION |
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535 | NS16550_STATIC void ns16550_isr( rtems_vector_number vector, void *arg) |
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536 | { |
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537 | int minor = (int) arg; |
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538 | |
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539 | ns16550_process( minor); |
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540 | } |
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541 | #elif defined BSP_FEATURE_IRQ_LEGACY |
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542 | NS16550_STATIC rtems_isr ns16550_isr( void *arg) |
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543 | { |
---|
544 | int minor = (int) arg; |
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545 | |
---|
546 | ns16550_process( minor); |
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547 | } |
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548 | #endif |
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549 | |
---|
550 | /* |
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551 | * ns16550_initialize_interrupts |
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552 | * |
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553 | * This routine initializes the port to operate in interrupt driver mode. |
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554 | */ |
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555 | NS16550_STATIC void ns16550_initialize_interrupts( int minor) |
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556 | { |
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557 | console_tbl *c = &Console_Port_Tbl [minor]; |
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558 | console_data *d = &Console_Port_Data [minor]; |
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559 | |
---|
560 | ns16550_init( minor); |
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561 | |
---|
562 | d->bActive = false; |
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563 | |
---|
564 | #ifdef BSP_FEATURE_IRQ_EXTENSION |
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565 | { |
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566 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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567 | sc = rtems_interrupt_handler_install( |
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568 | c->ulIntVector, |
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569 | "NS16550", |
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570 | RTEMS_INTERRUPT_SHARED, |
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571 | ns16550_isr, |
---|
572 | (void *) minor |
---|
573 | ); |
---|
574 | if (sc != RTEMS_SUCCESSFUL) { |
---|
575 | /* FIXME */ |
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576 | printk( "%s: Error: Install interrupt handler\n", __func__); |
---|
577 | rtems_fatal_error_occurred( 0xdeadbeef); |
---|
578 | } |
---|
579 | } |
---|
580 | #elif defined BSP_FEATURE_IRQ_LEGACY |
---|
581 | { |
---|
582 | int rv = 0; |
---|
583 | #ifdef BSP_FEATURE_IRQ_LEGACY_SHARED_HANDLER_SUPPORT |
---|
584 | rtems_irq_connect_data cd = { |
---|
585 | c->ulIntVector, |
---|
586 | ns16550_isr, |
---|
587 | (void *) minor, |
---|
588 | NULL, |
---|
589 | NULL, |
---|
590 | NULL, |
---|
591 | NULL |
---|
592 | }; |
---|
593 | rv = BSP_install_rtems_shared_irq_handler( &cd); |
---|
594 | #else |
---|
595 | rtems_irq_connect_data cd = { |
---|
596 | c->ulIntVector, |
---|
597 | ns16550_isr, |
---|
598 | (void *) minor, |
---|
599 | NULL, |
---|
600 | NULL, |
---|
601 | NULL |
---|
602 | }; |
---|
603 | rv = BSP_install_rtems_irq_handler( &cd); |
---|
604 | #endif |
---|
605 | if (rv == 0) { |
---|
606 | /* FIXME */ |
---|
607 | printk( "%s: Error: Install interrupt handler\n", __func__); |
---|
608 | rtems_fatal_error_occurred( 0xdeadbeef); |
---|
609 | } |
---|
610 | } |
---|
611 | #endif |
---|
612 | |
---|
613 | ns16550_enable_interrupts( minor, NS16550_ENABLE_ALL_INTR_EXCEPT_TX); |
---|
614 | } |
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615 | |
---|
616 | /* |
---|
617 | * ns16550_write_support_int |
---|
618 | * |
---|
619 | * Console Termios output entry point. |
---|
620 | */ |
---|
621 | |
---|
622 | NS16550_STATIC int ns16550_write_support_int( |
---|
623 | int minor, |
---|
624 | const char *buf, |
---|
625 | int len |
---|
626 | ) |
---|
627 | { |
---|
628 | uint32_t Irql; |
---|
629 | uint32_t pNS16550; |
---|
630 | setRegister_f setReg; |
---|
631 | |
---|
632 | setReg = Console_Port_Tbl[minor].setRegister; |
---|
633 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
634 | |
---|
635 | /* |
---|
636 | * We are using interrupt driven output and termios only sends us |
---|
637 | * one character at a time. |
---|
638 | */ |
---|
639 | |
---|
640 | if ( !len ) |
---|
641 | return 0; |
---|
642 | |
---|
643 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
---|
644 | ns16550_assert_RTS(minor); |
---|
645 | } |
---|
646 | |
---|
647 | rtems_interrupt_disable(Irql); |
---|
648 | if ( Console_Port_Data[minor].bActive == false) { |
---|
649 | Console_Port_Data[minor].bActive = true; |
---|
650 | ns16550_enable_interrupts(minor, NS16550_ENABLE_ALL_INTR); |
---|
651 | } |
---|
652 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, *buf); |
---|
653 | rtems_interrupt_enable(Irql); |
---|
654 | |
---|
655 | return 1; |
---|
656 | } |
---|
657 | |
---|
658 | /* |
---|
659 | * ns16550_write_support_polled |
---|
660 | * |
---|
661 | * Console Termios output entry point. |
---|
662 | * |
---|
663 | */ |
---|
664 | |
---|
665 | NS16550_STATIC int ns16550_write_support_polled( |
---|
666 | int minor, |
---|
667 | const char *buf, |
---|
668 | int len |
---|
669 | ) |
---|
670 | { |
---|
671 | int nwrite = 0; |
---|
672 | |
---|
673 | /* |
---|
674 | * poll each byte in the string out of the port. |
---|
675 | */ |
---|
676 | while (nwrite < len) { |
---|
677 | /* |
---|
678 | * transmit character |
---|
679 | */ |
---|
680 | ns16550_write_polled(minor, *buf++); |
---|
681 | nwrite++; |
---|
682 | } |
---|
683 | |
---|
684 | /* |
---|
685 | * return the number of bytes written. |
---|
686 | */ |
---|
687 | return nwrite; |
---|
688 | } |
---|
689 | |
---|
690 | /* |
---|
691 | * ns16550_inbyte_nonblocking_polled |
---|
692 | * |
---|
693 | * Console Termios polling input entry point. |
---|
694 | */ |
---|
695 | |
---|
696 | NS16550_STATIC int ns16550_inbyte_nonblocking_polled( |
---|
697 | int minor |
---|
698 | ) |
---|
699 | { |
---|
700 | uint32_t pNS16550; |
---|
701 | unsigned char ucLineStatus; |
---|
702 | char cChar; |
---|
703 | getRegister_f getReg; |
---|
704 | |
---|
705 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
706 | getReg = Console_Port_Tbl[minor].getRegister; |
---|
707 | |
---|
708 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
---|
709 | if(ucLineStatus & SP_LSR_RDY) { |
---|
710 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
---|
711 | return (int)cChar; |
---|
712 | } else { |
---|
713 | return -1; |
---|
714 | } |
---|
715 | } |
---|