1 | /***************************************************************************** |
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2 | * File: sci.c |
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3 | * |
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4 | * Desc: This file contains the console IO routines for the SCI port. |
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5 | * There are two interfaces in this module. One is for the rtems |
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6 | * termios/console code and the other is a device driver interface. |
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7 | * This module works together with the termio module which is |
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8 | * sometimes referred to as the "line disciplines" which implements |
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9 | * terminal i/o processing like tabs, backspaces, and newlines. |
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10 | * The rtems printf uses interrupt io and the rtems printk routine |
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11 | * uses polled io which is better for debugging. |
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12 | * |
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13 | * Index: Documentation |
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14 | * Section A - Include Files |
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15 | * Section B - Manifest Constants |
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16 | * Section C - External Data |
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17 | * Section D - External Functions |
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18 | * Section E - Local Functions |
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19 | * Section F - Local Variables |
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20 | * Section G - A circular data buffer for rcv chars |
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21 | * Section H - RTEMS termios callbacks for the interrupt api |
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22 | * Section I - RTEMS termios callbacks for the polled api |
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23 | |
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24 | * Section 0 - Miscellaneous routines |
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25 | * Section 1 - Routines to manipulate the circular buffer |
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26 | * Section 2 - Interrupt based entry points for the termios module |
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27 | * Section 3 - Polling based entry points for the termios module |
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28 | * Section 4 - Device driver public api entry points |
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29 | * Section 5 - Hardware level routines |
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30 | * Section 6 - Testing and debugging code |
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31 | * |
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32 | * Refer: Motorola QSM Reference Manual - Chapter 5 - SCI sub-module |
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33 | * |
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34 | * Note: See bsp.h,confdefs.h,system.h for installing drivers into RTEMS. |
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35 | * |
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36 | * $Id$ |
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37 | * |
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38 | * $Log$ |
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39 | * Revision 1.3 2003/01/20 20:33:17 joel |
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40 | * 2003-01-20 Duane Gustavus <duane@unt.edu> |
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41 | * |
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42 | * * console/sci.c, include/mrm332.h, startup/linkcmds, |
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43 | * startup/linkcmds_ROM: Various updates to make this run properly |
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44 | * from ROM. |
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45 | * |
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46 | * Revision 1.2 2002/11/04 14:26:47 joel |
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47 | * 2002-11-04 Joel Sherrill <joel@OARcorp.com> |
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48 | * |
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49 | * * console/sci.c, spurious/spinit.c: Removed warnings. |
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50 | * |
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51 | * Revision 1.1 2002/02/28 23:10:39 joel |
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52 | * 2002-02-28 Mike Panetta <ahuitzot@mindspring.com> |
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53 | * |
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54 | * * console/sci.c, console/sci.h, |
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55 | * console/console.c: Added new SCI driver. |
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56 | * * start/start.c: Removed file. |
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57 | * * start/start.S: New file, the asm portion of the updated start code. |
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58 | * * start/configure.am: Added start.S, removed start.c |
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59 | * * startup/start_c.c: New file, the C portion of the updated start code. Contains most of the code that was in the old start.c. |
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60 | * * startup/configure.am: Added start_c.c to C_FILES. |
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61 | * * include/bsp.h: Added include <rtems/bspIo.h> |
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62 | * |
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63 | *****************************************************************************/ |
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64 | |
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65 | |
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66 | /***************************************************************************** |
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67 | Compiler Options for the incurably curious |
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68 | *****************************************************************************/ |
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69 | |
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70 | /* |
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71 | /opt/rtems/bin/m68k-rtems-gcc |
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72 | --pipe # use pipes, not tmp files |
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73 | -B../../../../../../../../opti/lib/ # where the library is |
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74 | -specs bsp_specs # ??? |
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75 | -qrtems # ??? |
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76 | -g # add debugging info |
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77 | -Wall # issue all warnings |
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78 | -fasm # allow inline asm??? |
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79 | -DCONSOLE_SCI # for opti-r box/rev b proto |
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80 | -mcpu32 # machine = motorola cpu 32 |
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81 | -c # compile, don't link |
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82 | -O4 # max optimization |
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83 | -fomit-frame-pointer # stack frames are optional |
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84 | -o o-optimize/sci.o # the object file |
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85 | ../../../../../../../../../rtems/c/src/lib/libbsp/m68k/opti/console/sci.c |
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86 | */ |
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87 | |
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88 | |
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89 | /***************************************************************************** |
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90 | Overview of serial port console terminal input/output |
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91 | *****************************************************************************/ |
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92 | |
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93 | /* |
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94 | +-----------+ +---------+ |
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95 | | app | | app | |
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96 | +-----------+ +---------+ |
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97 | | | |
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98 | | (printf,scanf,etc.) | |
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99 | v | |
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100 | +-----------+ | |
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101 | | libc | | |
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102 | +-----------+ | |
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103 | | | |
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104 | | | |
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105 | | (open,close,read,write,ioctl) | |
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106 | ======|==========================================|======================== |
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107 | | /dev/console | /dev/sci |
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108 | | (stdin,stdout,stderr) | |
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109 | ======|==========================================|======================== |
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110 | | | |
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111 | | | |
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112 | v v |
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113 | +-----------+ +-----------+ +---------+ |
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114 | | console | <---> | termios | <---> | sci | |
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115 | | driver | | module | | driver | |
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116 | +-----------+ +-----------+ +---------+ |
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117 | | |
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118 | | |
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119 | v |
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120 | +---------+ |
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121 | | | |
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122 | | uart | |
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123 | | | |
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124 | +---------+ |
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125 | */ |
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126 | |
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127 | |
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128 | /***************************************************************************** |
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129 | Section A - Include Files |
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130 | *****************************************************************************/ |
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131 | |
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132 | #include <rtems.h> |
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133 | #include <bsp.h> |
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134 | #include <rtems/bspIo.h> |
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135 | #include <stdio.h> |
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136 | #include <rtems/libio.h> |
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137 | #include <libchip/serial.h> |
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138 | #include <libchip/sersupp.h> |
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139 | #include "sci.h" |
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140 | //#include "../misc/include/cpu332.h" |
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141 | |
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142 | |
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143 | /***************************************************************************** |
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144 | Section B - Manifest Constants |
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145 | *****************************************************************************/ |
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146 | |
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147 | #define SCI_MINOR 0 // minor device number |
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148 | |
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149 | |
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150 | // IMPORTANT - if the device driver api is opened, it means the sci is being |
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151 | // used for direct hardware access, so other users (like termios) get ignored |
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152 | |
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153 | #define DRIVER_CLOSED 0 // the device driver api is closed |
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154 | #define DRIVER_OPENED 1 // the device driver api is opened |
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155 | |
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156 | |
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157 | // system clock definitions, i dont have documentation on this... |
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158 | |
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159 | #if 0 // Not needed, this is provided in mrm332.h |
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160 | #define XTAL 32768.0 // crystal frequency in Hz |
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161 | #define NUMB_W 0 // system clock parameters |
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162 | #define NUMB_X 1 |
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163 | //efine NUMB_Y 0x38 // for 14.942 Mhz |
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164 | #define NUMB_Y 0x3F // for 16.777 Mhz |
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165 | |
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166 | #define SYS_CLOCK (XTAL * 4.0 * (NUMB_Y+1) * (1 << (2 * NUMB_W + NUMB_X))) |
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167 | |
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168 | #endif |
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169 | |
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170 | |
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171 | /***************************************************************************** |
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172 | Section C - External Data |
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173 | *****************************************************************************/ |
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174 | |
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175 | |
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176 | |
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177 | |
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178 | /***************************************************************************** |
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179 | Section D - External Functions |
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180 | *****************************************************************************/ |
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181 | |
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182 | |
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183 | |
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184 | /***************************************************************************** |
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185 | Section E - Local Functions |
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186 | *****************************************************************************/ |
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187 | |
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188 | void SCI_output_char(char c); |
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189 | |
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190 | rtems_isr SciIsr( rtems_vector_number vector ); // interrupt handler |
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191 | |
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192 | const rtems_termios_callbacks * SciGetTermiosHandlers( signed32 polled ); |
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193 | |
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194 | rtems_device_driver SciInitialize (); // device driver api |
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195 | rtems_device_driver SciOpen (); // device driver api |
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196 | rtems_device_driver SciClose (); // device driver api |
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197 | rtems_device_driver SciRead (); // device driver api |
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198 | rtems_device_driver SciWrite (); // device driver api |
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199 | rtems_device_driver SciControl (); // device driver api |
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200 | |
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201 | signed32 SciInterruptOpen(); // termios api |
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202 | signed32 SciInterruptClose(); // termios api |
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203 | signed32 SciInterruptWrite(); // termios api |
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204 | |
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205 | signed32 SciSetAttributes(); // termios api |
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206 | |
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207 | signed32 SciPolledOpen(); // termios api |
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208 | signed32 SciPolledClose(); // termios api |
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209 | signed32 SciPolledRead(); // termios api |
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210 | signed32 SciPolledWrite(); // termios api |
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211 | |
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212 | static void SciSetBaud(unsigned32 rate); // hardware routine |
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213 | static void SciSetDataBits(unsigned16 bits); // hardware routine |
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214 | static void SciSetParity(unsigned16 parity); // hardware routine |
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215 | |
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216 | static void inline SciDisableAllInterrupts( void ); // hardware routine |
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217 | static void inline SciDisableTransmitInterrupts( void );// hardware routine |
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218 | static void inline SciDisableReceiveInterrupts( void ); // hardware routine |
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219 | |
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220 | static void inline SciEnableTransmitInterrupts( void ); // hardware routine |
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221 | static void inline SciEnableReceiveInterrupts( void ); // hardware routine |
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222 | |
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223 | static void inline SciDisableReceiver( void ); // hardware routine |
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224 | static void inline SciDisableTransmitter( void ); // hardware routine |
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225 | |
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226 | static void inline SciEnableReceiver( void ); // hardware routine |
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227 | static void inline SciEnableTransmitter( void ); // hardware routine |
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228 | |
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229 | void SciWriteCharWait ( unsigned8 ); // hardware routine |
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230 | void SciWriteCharNoWait( unsigned8 ); // hardware routine |
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231 | |
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232 | unsigned8 inline SciCharAvailable( void ); // hardware routine |
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233 | |
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234 | unsigned8 inline SciReadCharWait( void ); // hardware routine |
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235 | unsigned8 inline SciReadCharNoWait( void ); // hardware routine |
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236 | |
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237 | void SciSendBreak( void ); // test routine |
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238 | |
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239 | static signed8 SciRcvBufGetChar(); // circular rcv buf |
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240 | static void SciRcvBufPutChar( unsigned8 ); // circular rcv buf |
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241 | //atic void SciRcvBufFlush( void ); // circular rcv buf |
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242 | |
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243 | void SciUnitTest(); // test routine |
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244 | void SciPrintStats(); // test routine |
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245 | |
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246 | |
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247 | /***************************************************************************** |
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248 | Section F - Local Variables |
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249 | *****************************************************************************/ |
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250 | |
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251 | static struct rtems_termios_tty *SciTermioTty; |
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252 | |
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253 | |
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254 | static unsigned8 SciInited = 0; // has the driver been inited |
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255 | |
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256 | static unsigned8 SciOpened; // has the driver been opened |
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257 | |
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258 | static unsigned8 SciMajor; // major device number |
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259 | |
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260 | static unsigned16 SciBaud; // current value in baud register |
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261 | |
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262 | static unsigned32 SciBytesIn = 0; // bytes received |
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263 | static unsigned32 SciBytesOut = 0; // bytes transmitted |
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264 | |
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265 | static unsigned32 SciErrorsParity = 0; // error counter |
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266 | static unsigned32 SciErrorsNoise = 0; // error counter |
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267 | static unsigned32 SciErrorsFraming = 0; // error counter |
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268 | static unsigned32 SciErrorsOverrun = 0; // error counter |
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269 | |
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270 | #if defined(CONSOLE_SCI) |
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271 | |
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272 | // this is what rtems printk uses to do polling based output |
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273 | |
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274 | BSP_output_char_function_type BSP_output_char = SCI_output_char; |
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275 | BSP_polling_getchar_function_type BSP_poll_char = NULL; |
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276 | |
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277 | #endif |
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278 | |
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279 | |
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280 | // cvs id string so you can use the unix ident command on the object |
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281 | |
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282 | #ifdef ID_STRINGS |
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283 | static const char SciIdent[]="$Id$"; |
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284 | #endif |
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285 | |
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286 | |
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287 | /***************************************************************************** |
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288 | Section G - A circular buffer for rcv chars when the driver interface is used. |
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289 | *****************************************************************************/ |
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290 | |
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291 | // it is trivial to wrap your buffer pointers when size is a power of two |
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292 | |
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293 | #define SCI_RCV_BUF_SIZE 256 // must be a power of 2 !!! |
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294 | |
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295 | // if someone opens the sci device using the device driver interface, |
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296 | // then the receive data interrupt handler will put characters in this buffer |
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297 | // instead of sending them up to the termios module for the console |
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298 | |
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299 | static unsigned8 SciRcvBuffer[SCI_RCV_BUF_SIZE]; |
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300 | |
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301 | static unsigned8 SciRcvBufPutIndex = 0; // array index to put in next char |
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302 | |
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303 | static unsigned8 SciRcvBufGetIndex = 0; // array index to take out next char |
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304 | |
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305 | static unsigned8 SciRcvBufCount = 0; // how many bytes are in the buffer |
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306 | |
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307 | |
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308 | |
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309 | /***************************************************************************** |
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310 | Section H - RTEMS termios callbacks for the interrupt version of the driver |
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311 | *****************************************************************************/ |
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312 | |
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313 | static const rtems_termios_callbacks SciInterruptCallbacks = |
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314 | { |
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315 | SciInterruptOpen, // first open |
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316 | SciInterruptClose, // last close |
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317 | NULL, // polled read (not required) |
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318 | SciInterruptWrite, // write |
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319 | SciSetAttributes, // set attributes |
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320 | NULL, // stop remote xmit |
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321 | NULL, // start remote xmit |
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322 | TRUE // output uses interrupts |
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323 | }; |
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324 | |
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325 | |
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326 | /***************************************************************************** |
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327 | Section I - RTEMS termios callbacks for the polled version of the driver |
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328 | *****************************************************************************/ |
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329 | |
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330 | static const rtems_termios_callbacks SciPolledCallbacks = |
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331 | { |
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332 | SciPolledOpen, // first open |
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333 | SciPolledClose, // last close |
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334 | SciPolledRead, // polled read |
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335 | SciPolledWrite, // write |
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336 | SciSetAttributes, // set attributes |
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337 | NULL, // stop remote xmit |
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338 | NULL, // start remote xmit |
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339 | FALSE // output uses interrupts |
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340 | }; |
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341 | |
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342 | |
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343 | ///////////////////////////////////////////////////////////////////////////// |
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344 | // |
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345 | // SECTION 0 |
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346 | // MISCELLANEOUS ROUTINES |
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347 | // |
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348 | ///////////////////////////////////////////////////////////////////////////// |
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349 | |
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350 | |
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351 | /**************************************************************************** |
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352 | * Func: SCI_output_char |
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353 | * Desc: used by rtems printk function to send a char to the uart |
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354 | * Inputs: the character to transmit |
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355 | * Outputs: none |
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356 | * Errors: none |
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357 | * Scope: public |
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358 | ****************************************************************************/ |
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359 | |
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360 | void SCI_output_char(char c) |
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361 | { |
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362 | // ( minor device number, pointer to the character, length ) |
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363 | |
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364 | SciPolledWrite( SCI_MINOR, &c, 1); |
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365 | |
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366 | return; |
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367 | } |
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368 | |
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369 | |
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370 | /**************************************************************************** |
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371 | * Func: SciGetTermiosHandlers |
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372 | * Desc: returns a pointer to the table of serial io functions |
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373 | * this is called from console_open with polled set to false |
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374 | * Inputs: flag indicating whether we want polled or interrupt driven io |
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375 | * Outputs: pointer to function table |
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376 | * Errors: none |
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377 | * Scope: public |
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378 | ****************************************************************************/ |
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379 | |
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380 | const rtems_termios_callbacks * SciGetTermiosHandlers( signed32 polled ) |
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381 | { |
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382 | if ( polled ) |
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383 | { |
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384 | return &SciPolledCallbacks; // polling based |
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385 | } |
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386 | else |
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387 | { |
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388 | return &SciInterruptCallbacks; // interrupt driven |
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389 | } |
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390 | } |
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391 | |
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392 | |
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393 | /**************************************************************************** |
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394 | * Func: SciIsr |
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395 | * Desc: interrupt handler for serial communications interface |
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396 | * Inputs: vector number - unused |
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397 | * Outputs: none |
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398 | * Errors: none |
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399 | * Scope: public API |
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400 | ****************************************************************************/ |
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401 | |
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402 | rtems_isr SciIsr( rtems_vector_number vector ) |
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403 | { |
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404 | unsigned8 ch; |
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405 | |
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406 | |
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407 | if ( (*SCSR) & SCI_ERROR_PARITY ) SciErrorsParity ++; |
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408 | if ( (*SCSR) & SCI_ERROR_FRAMING ) SciErrorsFraming ++; |
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409 | if ( (*SCSR) & SCI_ERROR_NOISE ) SciErrorsNoise ++; |
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410 | if ( (*SCSR) & SCI_ERROR_OVERRUN ) SciErrorsOverrun ++; |
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411 | |
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412 | |
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413 | // see if it was a transmit interrupt |
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414 | |
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415 | if ( (*SCSR) & SCI_XMTR_AVAILABLE ) // data reg empty, xmt complete |
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416 | { |
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417 | SciDisableTransmitInterrupts(); |
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418 | |
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419 | // tell termios module that the charcter was sent |
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420 | // he will call us later to transmit more if there are any |
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421 | |
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422 | if (rtems_termios_dequeue_characters( SciTermioTty, 1 )) |
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423 | { |
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424 | // there are more bytes to transmit so enable TX interrupt |
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425 | |
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426 | SciEnableTransmitInterrupts(); |
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427 | } |
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428 | } |
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429 | |
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430 | // see if it was a receive interrupt |
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431 | // on the sci uart we just get one character per interrupt |
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432 | |
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433 | while ( SciCharAvailable() ) // char in data register? |
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434 | { |
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435 | ch = SciReadCharNoWait(); // get the char from the uart |
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436 | |
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437 | // IMPORTANT!!! |
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438 | // either send it to the termios module or keep it locally |
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439 | |
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440 | if ( SciOpened == DRIVER_OPENED ) // the driver is open |
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441 | { |
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442 | SciRcvBufPutChar(ch); // keep it locally |
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443 | } |
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444 | else // put in termios buffer |
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445 | { |
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446 | rtems_termios_enqueue_raw_characters( SciTermioTty, &ch, 1 ); |
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447 | } |
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448 | |
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449 | *SCSR &= SCI_CLEAR_RX_INT; // clear the interrupt |
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450 | } |
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451 | } |
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452 | |
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453 | |
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454 | ///////////////////////////////////////////////////////////////////////////// |
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455 | // |
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456 | // SECTION 1 |
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457 | // ROUTINES TO MANIPULATE THE CIRCULAR BUFFER |
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458 | // |
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459 | ///////////////////////////////////////////////////////////////////////////// |
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460 | |
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461 | |
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462 | /**************************************************************************** |
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463 | * Func: SciRcvBufGetChar |
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464 | * Desc: read a character from the circular buffer |
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465 | * make sure there is data before you call this! |
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466 | * Inputs: none |
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467 | * Outputs: the character or -1 |
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468 | * Errors: none |
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469 | * Scope: private |
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470 | ****************************************************************************/ |
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471 | |
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472 | static signed8 SciRcvBufGetChar() |
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473 | { |
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474 | rtems_interrupt_level level; |
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475 | unsigned8 ch; |
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476 | |
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477 | if ( SciRcvBufCount == 0 ) |
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478 | { |
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479 | rtems_fatal_error_occurred(0xDEAD); // check the count first! |
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480 | } |
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481 | |
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482 | rtems_interrupt_disable( level ); // disable interrupts |
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483 | |
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484 | ch = SciRcvBuffer[SciRcvBufGetIndex]; // get next byte |
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485 | |
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486 | SciRcvBufGetIndex++; // bump the index |
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487 | |
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488 | SciRcvBufGetIndex &= SCI_RCV_BUF_SIZE - 1; // and wrap it |
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489 | |
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490 | SciRcvBufCount--; // decrement counter |
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491 | |
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492 | rtems_interrupt_enable( level ); // restore interrupts |
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493 | |
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494 | return ch; // return the char |
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495 | } |
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496 | |
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497 | |
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498 | |
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499 | /**************************************************************************** |
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500 | * Func: SciRcvBufPutChar |
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501 | * Desc: put a character into the rcv data circular buffer |
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502 | * Inputs: the character |
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503 | * Outputs: none |
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504 | * Errors: none |
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505 | * Scope: private |
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506 | ****************************************************************************/ |
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507 | |
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508 | static void SciRcvBufPutChar( unsigned8 ch ) |
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509 | { |
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510 | rtems_interrupt_level level; |
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511 | |
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512 | if ( SciRcvBufCount == SCI_RCV_BUF_SIZE ) // is there room? |
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513 | { |
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514 | return; // no, throw it away |
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515 | } |
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516 | |
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517 | rtems_interrupt_disable( level ); // disable interrupts |
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518 | |
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519 | SciRcvBuffer[SciRcvBufPutIndex] = ch; // put it in the buf |
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520 | |
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521 | SciRcvBufPutIndex++; // bump the index |
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522 | |
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523 | SciRcvBufPutIndex &= SCI_RCV_BUF_SIZE - 1; // and wrap it |
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524 | |
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525 | SciRcvBufCount++; // increment counter |
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526 | |
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527 | rtems_interrupt_enable( level ); // restore interrupts |
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528 | |
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529 | return; // return |
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530 | } |
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531 | |
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532 | |
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533 | /**************************************************************************** |
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534 | * Func: SciRcvBufFlush |
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535 | * Desc: completely reset and clear the rcv buffer |
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536 | * Inputs: none |
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537 | * Outputs: none |
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538 | * Errors: none |
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539 | * Scope: private |
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540 | ****************************************************************************/ |
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541 | |
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542 | #if 0 // prevents compiler warning |
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543 | static void SciRcvBufFlush( void ) |
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544 | { |
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545 | rtems_interrupt_level level; |
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546 | |
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547 | rtems_interrupt_disable( level ); // disable interrupts |
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548 | |
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549 | memset( SciRcvBuffer, 0, sizeof(SciRcvBuffer) ); |
---|
550 | |
---|
551 | SciRcvBufPutIndex = 0; // clear |
---|
552 | |
---|
553 | SciRcvBufGetIndex = 0; // clear |
---|
554 | |
---|
555 | SciRcvBufCount = 0; // clear |
---|
556 | |
---|
557 | rtems_interrupt_enable( level ); // restore interrupts |
---|
558 | |
---|
559 | return; // return |
---|
560 | } |
---|
561 | #endif |
---|
562 | |
---|
563 | |
---|
564 | ///////////////////////////////////////////////////////////////////////////// |
---|
565 | // |
---|
566 | // SECTION 2 |
---|
567 | // INTERRUPT BASED ENTRY POINTS FOR THE TERMIOS MODULE |
---|
568 | // |
---|
569 | ///////////////////////////////////////////////////////////////////////////// |
---|
570 | |
---|
571 | |
---|
572 | /**************************************************************************** |
---|
573 | * Func: SciInterruptOpen |
---|
574 | * Desc: open routine for the interrupt based device driver |
---|
575 | * Default state is 9600 baud, 8 bits, No parity, and 1 stop bit. ?? |
---|
576 | **CHANGED** Default baud rate is now 19200, 8N1 |
---|
577 | * called from rtems_termios_open which is called from console_open |
---|
578 | * Inputs: major - device number |
---|
579 | * minor - device number |
---|
580 | * args - points to terminal info |
---|
581 | * Outputs: success/fail |
---|
582 | * Errors: none |
---|
583 | * Scope: public API |
---|
584 | ****************************************************************************/ |
---|
585 | |
---|
586 | signed32 SciInterruptOpen( |
---|
587 | signed32 major, |
---|
588 | signed32 minor, |
---|
589 | void *arg |
---|
590 | ) |
---|
591 | { |
---|
592 | rtems_libio_open_close_args_t * args = arg; |
---|
593 | rtems_isr_entry old_vector; |
---|
594 | |
---|
595 | if ( minor != SCI_MINOR ) // check minor device num |
---|
596 | { |
---|
597 | return -1; |
---|
598 | } |
---|
599 | |
---|
600 | if ( !args ) // must have args |
---|
601 | { |
---|
602 | return -1; |
---|
603 | } |
---|
604 | |
---|
605 | SciTermioTty = args->iop->data1; // save address of struct |
---|
606 | |
---|
607 | SciDisableAllInterrupts(); // turn off sci interrupts |
---|
608 | |
---|
609 | // THIS IS ACTUALLY A BAD THING - SETTING LINE PARAMETERS HERE |
---|
610 | // IT SHOULD BE DONE THROUGH TCSETATTR() WHEN THE CONSOLE IS OPENED!!! |
---|
611 | |
---|
612 | // SciSetBaud(115200); // set the baud rate |
---|
613 | // SciSetBaud( 57600); // set the baud rate |
---|
614 | // SciSetBaud( 38400); // set the baud rate |
---|
615 | SciSetBaud( 19200); // set the baud rate |
---|
616 | // SciSetBaud( 9600); // set the baud rate |
---|
617 | |
---|
618 | SciSetParity(SCI_PARITY_NONE); // set parity to none |
---|
619 | |
---|
620 | SciSetDataBits(SCI_8_DATA_BITS); // set data bits to 8 |
---|
621 | |
---|
622 | |
---|
623 | // Install our interrupt handler into RTEMS, where does 66 come from? |
---|
624 | |
---|
625 | rtems_interrupt_catch( SciIsr, 66, &old_vector ); |
---|
626 | |
---|
627 | *QIVR = 66; |
---|
628 | *QIVR &= 0xf8; |
---|
629 | *QILR |= 0x06 & 0x07; |
---|
630 | |
---|
631 | SciEnableTransmitter(); // enable the transmitter |
---|
632 | |
---|
633 | SciEnableReceiver(); // enable the receiver |
---|
634 | |
---|
635 | SciEnableReceiveInterrupts(); // enable rcv interrupts |
---|
636 | |
---|
637 | return RTEMS_SUCCESSFUL; |
---|
638 | } |
---|
639 | |
---|
640 | |
---|
641 | /**************************************************************************** |
---|
642 | * Func: SciInterruptClose |
---|
643 | * Desc: close routine called by the termios module |
---|
644 | * Inputs: major - device number |
---|
645 | * minor - device number |
---|
646 | * args - unused |
---|
647 | * Outputs: success/fail |
---|
648 | * Errors: none |
---|
649 | * Scope: public - termio entry point |
---|
650 | ****************************************************************************/ |
---|
651 | |
---|
652 | signed32 SciInterruptClose( |
---|
653 | signed32 major, |
---|
654 | signed32 minor, |
---|
655 | void *arg |
---|
656 | ) |
---|
657 | { |
---|
658 | SciDisableAllInterrupts(); |
---|
659 | |
---|
660 | return RTEMS_SUCCESSFUL; |
---|
661 | } |
---|
662 | |
---|
663 | |
---|
664 | /**************************************************************************** |
---|
665 | * Func: SciInterruptWrite |
---|
666 | * Desc: writes data to the uart using transmit interrupts |
---|
667 | * Inputs: minor - device number |
---|
668 | * buf - points to the data |
---|
669 | * len - number of bytes to send |
---|
670 | * Outputs: success/fail |
---|
671 | * Errors: none |
---|
672 | * Scope: public API |
---|
673 | ****************************************************************************/ |
---|
674 | |
---|
675 | signed32 SciInterruptWrite( |
---|
676 | signed32 minor, |
---|
677 | const char *buf, |
---|
678 | signed32 len |
---|
679 | ) |
---|
680 | { |
---|
681 | // We are using interrupt driven output so termios only sends us |
---|
682 | // one character at a time. The sci does not have a fifo. |
---|
683 | |
---|
684 | if ( !len ) // no data? |
---|
685 | { |
---|
686 | return 0; // return error |
---|
687 | } |
---|
688 | |
---|
689 | if ( minor != SCI_MINOR ) // check the minor dev num |
---|
690 | { |
---|
691 | return 0; // return error |
---|
692 | } |
---|
693 | |
---|
694 | if ( SciOpened == DRIVER_OPENED ) // is the driver api open? |
---|
695 | { |
---|
696 | return 1; // yep, throw this away |
---|
697 | } |
---|
698 | |
---|
699 | SciWriteCharNoWait(*buf); // try to send a char |
---|
700 | |
---|
701 | *SCSR &= SCI_CLEAR_TDRE; // clear tx data reg empty flag |
---|
702 | |
---|
703 | SciEnableTransmitInterrupts(); // enable the tx interrupt |
---|
704 | |
---|
705 | return 1; // return success |
---|
706 | } |
---|
707 | |
---|
708 | |
---|
709 | /**************************************************************************** |
---|
710 | * Func: SciSetAttributes |
---|
711 | * Desc: setup the uart based on the termios modules requests |
---|
712 | * Inputs: minor - device number |
---|
713 | * t - pointer to the termios info struct |
---|
714 | * Outputs: none |
---|
715 | * Errors: none |
---|
716 | * Scope: public API |
---|
717 | ****************************************************************************/ |
---|
718 | |
---|
719 | signed32 SciSetAttributes( |
---|
720 | signed32 minor, |
---|
721 | const struct termios *t |
---|
722 | ) |
---|
723 | { |
---|
724 | unsigned32 baud_requested; |
---|
725 | unsigned32 sci_rate = 0; |
---|
726 | unsigned16 sci_parity = 0; |
---|
727 | unsigned16 sci_databits = 0; |
---|
728 | |
---|
729 | if ( minor != SCI_MINOR ) // check the minor dev num |
---|
730 | { |
---|
731 | return -1; // return error |
---|
732 | } |
---|
733 | |
---|
734 | // if you look closely you will see this is the only thing we use |
---|
735 | // set the baud rate |
---|
736 | |
---|
737 | baud_requested = t->c_cflag & CBAUD; // baud rate |
---|
738 | |
---|
739 | if (!baud_requested) |
---|
740 | { |
---|
741 | // baud_requested = B9600; // default to 9600 baud |
---|
742 | baud_requested = B19200; // default to 19200 baud |
---|
743 | } |
---|
744 | |
---|
745 | sci_rate = termios_baud_to_number( baud_requested ); |
---|
746 | |
---|
747 | // parity error detection |
---|
748 | |
---|
749 | if (t->c_cflag & PARENB) // enable parity detection? |
---|
750 | { |
---|
751 | if (t->c_cflag & PARODD) |
---|
752 | { |
---|
753 | sci_parity = SCI_PARITY_ODD; // select odd parity |
---|
754 | } |
---|
755 | else |
---|
756 | { |
---|
757 | sci_parity = SCI_PARITY_EVEN; // select even parity |
---|
758 | } |
---|
759 | } |
---|
760 | else |
---|
761 | { |
---|
762 | sci_parity = SCI_PARITY_NONE; // no parity, most common |
---|
763 | } |
---|
764 | |
---|
765 | |
---|
766 | // set the number of data bits, 8 is most common |
---|
767 | |
---|
768 | if (t->c_cflag & CSIZE) // was it specified? |
---|
769 | { |
---|
770 | switch (t->c_cflag & CSIZE) |
---|
771 | { |
---|
772 | case CS8: sci_databits = SCI_8_DATA_BITS; break; |
---|
773 | default : sci_databits = SCI_9_DATA_BITS; break; |
---|
774 | } |
---|
775 | } |
---|
776 | else |
---|
777 | { |
---|
778 | sci_databits = SCI_8_DATA_BITS; // default to 8 data bits |
---|
779 | } |
---|
780 | |
---|
781 | |
---|
782 | // the number of stop bits; always 1 for SCI |
---|
783 | |
---|
784 | if (t->c_cflag & CSTOPB) |
---|
785 | { |
---|
786 | // do nothing |
---|
787 | } |
---|
788 | |
---|
789 | |
---|
790 | // setup the hardware with these serial port parameters |
---|
791 | |
---|
792 | SciSetBaud(sci_rate); // set the baud rate |
---|
793 | |
---|
794 | SciSetParity(sci_parity); // set the parity type |
---|
795 | |
---|
796 | SciSetDataBits(sci_databits); // set the data bits |
---|
797 | |
---|
798 | |
---|
799 | return RTEMS_SUCCESSFUL; |
---|
800 | } |
---|
801 | |
---|
802 | |
---|
803 | ///////////////////////////////////////////////////////////////////////////// |
---|
804 | // |
---|
805 | // SECTION 3 |
---|
806 | // POLLING BASED ENTRY POINTS FOR THE TERMIOS MODULE |
---|
807 | // |
---|
808 | ///////////////////////////////////////////////////////////////////////////// |
---|
809 | |
---|
810 | /**************************************************************************** |
---|
811 | * Func: SciPolledOpen |
---|
812 | * Desc: open routine for the polled i/o version of the driver |
---|
813 | * called from rtems_termios_open which is called from console_open |
---|
814 | * Inputs: major - device number |
---|
815 | * minor - device number |
---|
816 | * args - points to terminal info struct |
---|
817 | * Outputs: success/fail |
---|
818 | * Errors: none |
---|
819 | * Scope: public - termios entry point |
---|
820 | ****************************************************************************/ |
---|
821 | |
---|
822 | signed32 SciPolledOpen( |
---|
823 | signed32 major, |
---|
824 | signed32 minor, |
---|
825 | void *arg |
---|
826 | ) |
---|
827 | { |
---|
828 | rtems_libio_open_close_args_t * args = arg; |
---|
829 | |
---|
830 | if ( minor != SCI_MINOR ) // check minor device num |
---|
831 | { |
---|
832 | return -1; |
---|
833 | } |
---|
834 | |
---|
835 | if ( !args ) // must have args |
---|
836 | { |
---|
837 | return -1; |
---|
838 | } |
---|
839 | |
---|
840 | SciTermioTty = args->iop->data1; // Store tty pointer |
---|
841 | |
---|
842 | SciDisableAllInterrupts(); // don't generate interrupts |
---|
843 | |
---|
844 | // THIS IS ACTUALLY A BAD THING - SETTING LINE PARAMETERS HERE |
---|
845 | // IT SHOULD BE DONE THROUGH TCSETATTR() WHEN THE CONSOLE IS OPENED!!! |
---|
846 | |
---|
847 | // SciSetBaud(115200); // set the baud rate |
---|
848 | // SciSetBaud( 57600); // set the baud rate |
---|
849 | // SciSetBaud( 38400); // set the baud rate |
---|
850 | SciSetBaud( 19200); // set the baud rate |
---|
851 | // SciSetBaud( 9600); // set the baud rate |
---|
852 | |
---|
853 | SciSetParity(SCI_PARITY_NONE); // set no parity |
---|
854 | |
---|
855 | SciSetDataBits(SCI_8_DATA_BITS); // set 8 data bits |
---|
856 | |
---|
857 | SciEnableTransmitter(); // enable the xmitter |
---|
858 | |
---|
859 | SciEnableReceiver(); // enable the rcvr |
---|
860 | |
---|
861 | return RTEMS_SUCCESSFUL; |
---|
862 | } |
---|
863 | |
---|
864 | |
---|
865 | /**************************************************************************** |
---|
866 | * Func: SciPolledClose |
---|
867 | * Desc: close routine for the device driver, same for both |
---|
868 | * Inputs: major - device number |
---|
869 | * minor - device number |
---|
870 | * args - unused |
---|
871 | * Outputs: success/fail |
---|
872 | * Errors: none |
---|
873 | * Scope: public termios API |
---|
874 | ****************************************************************************/ |
---|
875 | |
---|
876 | signed32 SciPolledClose( |
---|
877 | signed32 major, |
---|
878 | signed32 minor, |
---|
879 | void *arg |
---|
880 | ) |
---|
881 | { |
---|
882 | SciDisableAllInterrupts(); |
---|
883 | |
---|
884 | return RTEMS_SUCCESSFUL; |
---|
885 | } |
---|
886 | |
---|
887 | |
---|
888 | /**************************************************************************** |
---|
889 | * Func: SciPolledRead |
---|
890 | * Desc: polling based read routine for the uart |
---|
891 | * Inputs: minor - device number |
---|
892 | * Outputs: error or the character read |
---|
893 | * Errors: none |
---|
894 | * Scope: public API |
---|
895 | ****************************************************************************/ |
---|
896 | |
---|
897 | signed32 SciPolledRead( |
---|
898 | signed32 minor |
---|
899 | ) |
---|
900 | { |
---|
901 | if ( minor != SCI_MINOR ) // check the minor dev num |
---|
902 | { |
---|
903 | return -1; // return error |
---|
904 | } |
---|
905 | |
---|
906 | if ( SciCharAvailable() ) // if a char is available |
---|
907 | { |
---|
908 | return SciReadCharNoWait(); // read the rx data register |
---|
909 | } |
---|
910 | |
---|
911 | return -1; // return error |
---|
912 | } |
---|
913 | |
---|
914 | |
---|
915 | /**************************************************************************** |
---|
916 | * Func: SciPolledWrite |
---|
917 | * Desc: writes out characters in polled mode, waiting for the uart |
---|
918 | * check in console_open, but we only seem to use interrupt mode |
---|
919 | * Inputs: minor - device number |
---|
920 | * buf - points to the data |
---|
921 | * len - how many bytes |
---|
922 | * Outputs: error or number of bytes written |
---|
923 | * Errors: none |
---|
924 | * Scope: public termios API |
---|
925 | ****************************************************************************/ |
---|
926 | |
---|
927 | signed32 SciPolledWrite( |
---|
928 | signed32 minor, |
---|
929 | const char *buf, |
---|
930 | signed32 len |
---|
931 | ) |
---|
932 | { |
---|
933 | signed32 written = 0; |
---|
934 | |
---|
935 | if ( minor != SCI_MINOR ) // check minor device num |
---|
936 | { |
---|
937 | return -1; |
---|
938 | } |
---|
939 | |
---|
940 | if ( SciOpened == DRIVER_OPENED ) // is the driver api open? |
---|
941 | { |
---|
942 | return -1; // toss the data |
---|
943 | } |
---|
944 | |
---|
945 | // send each byte in the string out the port |
---|
946 | |
---|
947 | while ( written < len ) |
---|
948 | { |
---|
949 | SciWriteCharWait(*buf++); // send a byte |
---|
950 | |
---|
951 | written++; // increment counter |
---|
952 | } |
---|
953 | |
---|
954 | return written; // return count |
---|
955 | } |
---|
956 | |
---|
957 | |
---|
958 | ///////////////////////////////////////////////////////////////////////////// |
---|
959 | // |
---|
960 | // SECTION 4 |
---|
961 | // DEVICE DRIVER PUBLIC API ENTRY POINTS |
---|
962 | // |
---|
963 | ///////////////////////////////////////////////////////////////////////////// |
---|
964 | |
---|
965 | |
---|
966 | /**************************************************************************** |
---|
967 | * Func: SciInit |
---|
968 | * Desc: Initialize the lasers device driver and hardware |
---|
969 | * Inputs: major - the major device number which is assigned by rtems |
---|
970 | * minor - the minor device number which is undefined at this point |
---|
971 | * arg - ????? |
---|
972 | * Outputs: RTEMS_SUCCESSFUL |
---|
973 | * Errors: None. |
---|
974 | * Scope: public API |
---|
975 | ****************************************************************************/ |
---|
976 | |
---|
977 | rtems_device_driver SciInitialize ( |
---|
978 | rtems_device_major_number major, |
---|
979 | rtems_device_minor_number minor, |
---|
980 | void * arg |
---|
981 | ) |
---|
982 | { |
---|
983 | // rtems_status_code status; |
---|
984 | |
---|
985 | //printk("%s\r\n", __FUNCTION__); |
---|
986 | |
---|
987 | |
---|
988 | // register the SCI device name for termios console i/o |
---|
989 | // this is done over in console.c which doesn't seem exactly right |
---|
990 | // but there were problems doing it here... |
---|
991 | |
---|
992 | // status = rtems_io_register_name( "/dev/sci", major, 0 ); |
---|
993 | |
---|
994 | // if (status != RTEMS_SUCCESSFUL) |
---|
995 | // rtems_fatal_error_occurred(status); |
---|
996 | |
---|
997 | |
---|
998 | SciMajor = major; // save the rtems major number |
---|
999 | |
---|
1000 | SciOpened = DRIVER_CLOSED; // initial state is closed |
---|
1001 | |
---|
1002 | |
---|
1003 | // if you have an interrupt handler, install it here |
---|
1004 | |
---|
1005 | |
---|
1006 | SciInited = 1; // set the inited flag |
---|
1007 | |
---|
1008 | return RTEMS_SUCCESSFUL; |
---|
1009 | } |
---|
1010 | |
---|
1011 | |
---|
1012 | /**************************************************************************** |
---|
1013 | * Func: SciOpen |
---|
1014 | * Desc: device driver open routine |
---|
1015 | * you must open a device before you can anything else |
---|
1016 | * only one process can have the device opened at a time |
---|
1017 | * you could look at the task id to restrict access if you want |
---|
1018 | * Inputs: major - the major device number assigned by rtems |
---|
1019 | * minor - the minor device number assigned by us |
---|
1020 | * arg - ????? |
---|
1021 | * Outputs: see below |
---|
1022 | * Errors: none |
---|
1023 | * Scope: public API |
---|
1024 | ****************************************************************************/ |
---|
1025 | |
---|
1026 | rtems_device_driver SciOpen ( |
---|
1027 | rtems_device_major_number major, |
---|
1028 | rtems_device_minor_number minor, |
---|
1029 | void * arg |
---|
1030 | ) |
---|
1031 | { |
---|
1032 | //printk("%s major=%d minor=%d\r\n", __FUNCTION__,major,minor); |
---|
1033 | |
---|
1034 | if (SciInited == 0) // must be initialized first! |
---|
1035 | { |
---|
1036 | return RTEMS_NOT_CONFIGURED; |
---|
1037 | } |
---|
1038 | |
---|
1039 | if (minor != SCI_MINOR) |
---|
1040 | { |
---|
1041 | return RTEMS_INVALID_NAME; // verify minor number |
---|
1042 | } |
---|
1043 | |
---|
1044 | if (SciOpened == DRIVER_OPENED) |
---|
1045 | { |
---|
1046 | return RTEMS_RESOURCE_IN_USE; // already opened! |
---|
1047 | } |
---|
1048 | |
---|
1049 | SciOpened = DRIVER_OPENED; // set the opened flag |
---|
1050 | |
---|
1051 | return RTEMS_SUCCESSFUL; |
---|
1052 | } |
---|
1053 | |
---|
1054 | |
---|
1055 | /**************************************************************************** |
---|
1056 | * Func: SciClose |
---|
1057 | * Desc: device driver close routine |
---|
1058 | * the device must be opened before you can close it |
---|
1059 | * the device must be closed before someone (else) can open it |
---|
1060 | * Inputs: major - the major device number |
---|
1061 | * minor - the minor device number |
---|
1062 | * arg - ????? |
---|
1063 | * Outputs: see below |
---|
1064 | * Errors: none |
---|
1065 | * Scope: public API |
---|
1066 | ****************************************************************************/ |
---|
1067 | |
---|
1068 | rtems_device_driver SciClose ( |
---|
1069 | rtems_device_major_number major, |
---|
1070 | rtems_device_minor_number minor, |
---|
1071 | void * arg |
---|
1072 | ) |
---|
1073 | { |
---|
1074 | //printk("%s major=%d minor=%d\r\n", __FUNCTION__,major,minor); |
---|
1075 | |
---|
1076 | if (minor != SCI_MINOR) |
---|
1077 | { |
---|
1078 | return RTEMS_INVALID_NAME; // check the minor number |
---|
1079 | } |
---|
1080 | |
---|
1081 | if (SciOpened != DRIVER_OPENED) |
---|
1082 | { |
---|
1083 | return RTEMS_INCORRECT_STATE; // must be opened first |
---|
1084 | } |
---|
1085 | |
---|
1086 | SciOpened = DRIVER_CLOSED; // set the flag |
---|
1087 | |
---|
1088 | return RTEMS_SUCCESSFUL; |
---|
1089 | } |
---|
1090 | |
---|
1091 | |
---|
1092 | /**************************************************************************** |
---|
1093 | * Func: SciRead |
---|
1094 | * Desc: device driver read routine |
---|
1095 | * this function is not meaningful for the laser devices |
---|
1096 | * Inputs: major - the major device number |
---|
1097 | * minor - the minor device number |
---|
1098 | * arg - read/write arguments |
---|
1099 | * Outputs: see below |
---|
1100 | * Errors: none |
---|
1101 | * Scope: public API |
---|
1102 | ****************************************************************************/ |
---|
1103 | |
---|
1104 | rtems_device_driver SciRead ( |
---|
1105 | rtems_device_major_number major, |
---|
1106 | rtems_device_minor_number minor, |
---|
1107 | void *arg |
---|
1108 | ) |
---|
1109 | { |
---|
1110 | rtems_libio_rw_args_t *rw_args; // ptr to argument struct |
---|
1111 | unsigned8 *buffer; |
---|
1112 | unsigned16 length; |
---|
1113 | |
---|
1114 | rw_args = (rtems_libio_rw_args_t *) arg; // arguments to read() |
---|
1115 | |
---|
1116 | |
---|
1117 | if (minor != SCI_MINOR) |
---|
1118 | { |
---|
1119 | return RTEMS_INVALID_NAME; // check the minor number |
---|
1120 | } |
---|
1121 | |
---|
1122 | if (SciOpened == DRIVER_CLOSED) |
---|
1123 | { |
---|
1124 | return RTEMS_INCORRECT_STATE; // must be opened first |
---|
1125 | } |
---|
1126 | |
---|
1127 | buffer = rw_args->buffer; // points to user's buffer |
---|
1128 | |
---|
1129 | length = rw_args->count; // how many bytes they want |
---|
1130 | |
---|
1131 | // *buffer = SciReadCharWait(); // wait for a character |
---|
1132 | |
---|
1133 | // if there isn't a character available, wait until one shows up |
---|
1134 | // or the timeout period expires, which ever happens first |
---|
1135 | |
---|
1136 | if ( SciRcvBufCount == 0 ) // no chars |
---|
1137 | { |
---|
1138 | // wait for someone to wake me up... |
---|
1139 | //rtems_task_wake_after(SciReadTimeout); |
---|
1140 | } |
---|
1141 | |
---|
1142 | if ( SciRcvBufCount ) // any characters locally? |
---|
1143 | { |
---|
1144 | *buffer = SciRcvBufGetChar(); // get the character |
---|
1145 | |
---|
1146 | rw_args->bytes_moved = 1; // how many we actually read |
---|
1147 | } |
---|
1148 | |
---|
1149 | return RTEMS_SUCCESSFUL; |
---|
1150 | } |
---|
1151 | |
---|
1152 | |
---|
1153 | /**************************************************************************** |
---|
1154 | * Func: SciWrite |
---|
1155 | * Desc: device driver write routine |
---|
1156 | * this function is not meaningful for the laser devices |
---|
1157 | * Inputs: major - the major device number |
---|
1158 | * minor - the minor device number |
---|
1159 | * arg - read/write arguments |
---|
1160 | * Outputs: see below |
---|
1161 | * Errors: non3 |
---|
1162 | * Scope: public API |
---|
1163 | ****************************************************************************/ |
---|
1164 | |
---|
1165 | rtems_device_driver SciWrite ( |
---|
1166 | rtems_device_major_number major, |
---|
1167 | rtems_device_minor_number minor, |
---|
1168 | void * arg |
---|
1169 | ) |
---|
1170 | { |
---|
1171 | rtems_libio_rw_args_t *rw_args; // ptr to argument struct |
---|
1172 | unsigned8 *buffer; |
---|
1173 | unsigned16 length; |
---|
1174 | |
---|
1175 | rw_args = (rtems_libio_rw_args_t *) arg; |
---|
1176 | |
---|
1177 | if (minor != SCI_MINOR) |
---|
1178 | { |
---|
1179 | return RTEMS_INVALID_NAME; // check the minor number |
---|
1180 | } |
---|
1181 | |
---|
1182 | if (SciOpened == DRIVER_CLOSED) |
---|
1183 | { |
---|
1184 | return RTEMS_INCORRECT_STATE; // must be opened first |
---|
1185 | } |
---|
1186 | |
---|
1187 | buffer = (unsigned8*)rw_args->buffer; // points to data |
---|
1188 | |
---|
1189 | length = rw_args->count; // how many bytes |
---|
1190 | |
---|
1191 | while (length--) |
---|
1192 | { |
---|
1193 | SciWriteCharWait(*buffer++); // send the bytes out |
---|
1194 | } |
---|
1195 | |
---|
1196 | rw_args->bytes_moved = rw_args->count; // how many we wrote |
---|
1197 | |
---|
1198 | return RTEMS_SUCCESSFUL; |
---|
1199 | } |
---|
1200 | |
---|
1201 | |
---|
1202 | /**************************************************************************** |
---|
1203 | * Func: SciControl |
---|
1204 | * Desc: device driver control routine |
---|
1205 | * see below for an example of how to use the ioctl interface |
---|
1206 | * Inputs: major - the major device number |
---|
1207 | * minor - the minor device number |
---|
1208 | * arg - io control args |
---|
1209 | * Outputs: see below |
---|
1210 | * Errors: none |
---|
1211 | * Scope: public API |
---|
1212 | ****************************************************************************/ |
---|
1213 | |
---|
1214 | rtems_device_driver SciControl ( |
---|
1215 | rtems_device_major_number major, |
---|
1216 | rtems_device_minor_number minor, |
---|
1217 | void * arg |
---|
1218 | ) |
---|
1219 | { |
---|
1220 | rtems_libio_ioctl_args_t *args = arg; // rtems arg struct |
---|
1221 | unsigned16 command; // the cmd to execute |
---|
1222 | unsigned16 unused; // maybe later |
---|
1223 | unsigned16 *ptr; // ptr to user data |
---|
1224 | |
---|
1225 | //printk("%s major=%d minor=%d\r\n", __FUNCTION__,major,minor); |
---|
1226 | |
---|
1227 | // do some sanity checking |
---|
1228 | |
---|
1229 | if (minor != SCI_MINOR) |
---|
1230 | { |
---|
1231 | return RTEMS_INVALID_NAME; // check the minor number |
---|
1232 | } |
---|
1233 | |
---|
1234 | if (SciOpened == DRIVER_CLOSED) |
---|
1235 | { |
---|
1236 | return RTEMS_INCORRECT_STATE; // must be open first |
---|
1237 | } |
---|
1238 | |
---|
1239 | if (args == 0) |
---|
1240 | { |
---|
1241 | return RTEMS_INVALID_ADDRESS; // must have args |
---|
1242 | } |
---|
1243 | |
---|
1244 | args->ioctl_return = -1; // assume an error |
---|
1245 | |
---|
1246 | command = args->command; // get the command |
---|
1247 | ptr = args->buffer; // this is an address |
---|
1248 | unused = *ptr; // brightness |
---|
1249 | |
---|
1250 | if (command == SCI_SEND_BREAK) // process the command |
---|
1251 | { |
---|
1252 | SciSendBreak(); // send break char |
---|
1253 | } |
---|
1254 | |
---|
1255 | args->ioctl_return = 0; // return status |
---|
1256 | |
---|
1257 | return RTEMS_SUCCESSFUL; |
---|
1258 | } |
---|
1259 | |
---|
1260 | |
---|
1261 | ///////////////////////////////////////////////////////////////////////////// |
---|
1262 | // |
---|
1263 | // SECTION 5 |
---|
1264 | // HARDWARE LEVEL ROUTINES |
---|
1265 | // |
---|
1266 | ///////////////////////////////////////////////////////////////////////////// |
---|
1267 | |
---|
1268 | |
---|
1269 | /**************************************************************************** |
---|
1270 | * Func: SciSetBaud |
---|
1271 | * Desc: setup the uart based on the termios modules requests |
---|
1272 | * Inputs: baud rate |
---|
1273 | * Outputs: none |
---|
1274 | * Errors: none |
---|
1275 | * Scope: private |
---|
1276 | ****************************************************************************/ |
---|
1277 | |
---|
1278 | static void SciSetBaud(unsigned32 rate) |
---|
1279 | { |
---|
1280 | unsigned16 value; |
---|
1281 | unsigned16 save_sccr1; |
---|
1282 | |
---|
1283 | // when you open the console you need to set the termio struct baud rate |
---|
1284 | // it has a default value of 9600, when someone calls tcsetattr it reverts! |
---|
1285 | |
---|
1286 | |
---|
1287 | SciBaud = rate; // save the rate |
---|
1288 | |
---|
1289 | // calculate the register value as a float and convert to an int |
---|
1290 | // set baud rate - you must define the system clock constant |
---|
1291 | // see mrm332.h for an example |
---|
1292 | |
---|
1293 | value = ( (unsigned16) ( SYS_CLOCK / rate / 32.0 + 0.5 ) & 0x1fff ); |
---|
1294 | |
---|
1295 | save_sccr1 = *SCCR1; // save register |
---|
1296 | |
---|
1297 | // also turns off the xmtr and rcvr |
---|
1298 | |
---|
1299 | *SCCR1 &= SCI_DISABLE_INT_ALL; // disable interrupts |
---|
1300 | |
---|
1301 | *SCCR0 = value; // write the register |
---|
1302 | |
---|
1303 | *SCCR1 = save_sccr1; // restore register |
---|
1304 | |
---|
1305 | return; |
---|
1306 | } |
---|
1307 | |
---|
1308 | |
---|
1309 | /**************************************************************************** |
---|
1310 | * Func: SciSetParity |
---|
1311 | * Desc: setup the uart based on the termios modules requests |
---|
1312 | * Inputs: parity |
---|
1313 | * Outputs: none |
---|
1314 | * Errors: none |
---|
1315 | * Scope: private |
---|
1316 | ****************************************************************************/ |
---|
1317 | |
---|
1318 | static void SciSetParity(unsigned16 parity) |
---|
1319 | { |
---|
1320 | unsigned16 value; |
---|
1321 | |
---|
1322 | value = *SCCR1; // get the register |
---|
1323 | |
---|
1324 | if (parity == SCI_PARITY_ODD) |
---|
1325 | { |
---|
1326 | value |= SCI_PARITY_ENABLE; // parity enabled |
---|
1327 | value |= SCI_PARITY_ODD; // parity odd |
---|
1328 | } |
---|
1329 | |
---|
1330 | else if (parity == SCI_PARITY_EVEN) |
---|
1331 | { |
---|
1332 | value |= SCI_PARITY_ENABLE; // parity enabled |
---|
1333 | value &= ~SCI_PARITY_ODD; // parity even |
---|
1334 | } |
---|
1335 | |
---|
1336 | else if (parity == SCI_PARITY_NONE) |
---|
1337 | { |
---|
1338 | value &= ~SCI_PARITY_ENABLE; // disabled, most common |
---|
1339 | } |
---|
1340 | |
---|
1341 | /* else no changes */ |
---|
1342 | |
---|
1343 | *SCCR1 = value; // write the register |
---|
1344 | |
---|
1345 | return; |
---|
1346 | } |
---|
1347 | |
---|
1348 | |
---|
1349 | /**************************************************************************** |
---|
1350 | * Func: SciSetDataBits |
---|
1351 | * Desc: setup the uart based on the termios modules requests |
---|
1352 | * Inputs: data bits |
---|
1353 | * Outputs: none |
---|
1354 | * Errors: none |
---|
1355 | * Scope: private |
---|
1356 | ****************************************************************************/ |
---|
1357 | |
---|
1358 | static void SciSetDataBits(unsigned16 bits) |
---|
1359 | { |
---|
1360 | unsigned16 value; |
---|
1361 | |
---|
1362 | value = *SCCR1; // get the register |
---|
1363 | |
---|
1364 | /* note - the parity setting affects the number of data bits */ |
---|
1365 | |
---|
1366 | if (bits == SCI_9_DATA_BITS) |
---|
1367 | { |
---|
1368 | value |= SCI_9_DATA_BITS; // 9 data bits |
---|
1369 | } |
---|
1370 | |
---|
1371 | else if (bits == SCI_8_DATA_BITS) |
---|
1372 | { |
---|
1373 | value &= SCI_8_DATA_BITS; // 8 data bits |
---|
1374 | } |
---|
1375 | |
---|
1376 | /* else no changes */ |
---|
1377 | |
---|
1378 | *SCCR1 = value; // write the register |
---|
1379 | |
---|
1380 | return; |
---|
1381 | } |
---|
1382 | |
---|
1383 | |
---|
1384 | /**************************************************************************** |
---|
1385 | * Func: SciDisableAllInterrupts |
---|
1386 | * Func: SciEnableTransmitInterrupts |
---|
1387 | * Func: SciEnableReceiveInterrupts |
---|
1388 | * Desc: handles generation of interrupts by the sci module |
---|
1389 | * Inputs: none |
---|
1390 | * Outputs: none |
---|
1391 | * Errors: none |
---|
1392 | * Scope: private |
---|
1393 | ****************************************************************************/ |
---|
1394 | |
---|
1395 | static void inline SciDisableAllInterrupts( void ) |
---|
1396 | { |
---|
1397 | // this also turns off the xmtr and rcvr |
---|
1398 | |
---|
1399 | *SCCR1 &= SCI_DISABLE_INT_ALL; |
---|
1400 | } |
---|
1401 | |
---|
1402 | static void inline SciEnableReceiveInterrupts( void ) |
---|
1403 | { |
---|
1404 | *SCCR1 |= SCI_ENABLE_INT_RX; |
---|
1405 | } |
---|
1406 | |
---|
1407 | static void inline SciDisableReceiveInterrupts( void ) |
---|
1408 | { |
---|
1409 | *SCCR1 &= SCI_DISABLE_INT_RX; |
---|
1410 | } |
---|
1411 | |
---|
1412 | static void inline SciEnableTransmitInterrupts( void ) |
---|
1413 | { |
---|
1414 | *SCCR1 |= SCI_ENABLE_INT_TX; |
---|
1415 | } |
---|
1416 | |
---|
1417 | static void inline SciDisableTransmitInterrupts( void ) |
---|
1418 | { |
---|
1419 | *SCCR1 &= SCI_DISABLE_INT_TX; |
---|
1420 | } |
---|
1421 | |
---|
1422 | |
---|
1423 | /**************************************************************************** |
---|
1424 | * Func: SciEnableTransmitter, SciDisableTransmitter |
---|
1425 | * Func: SciEnableReceiver, SciDisableReceiver |
---|
1426 | * Desc: turns the transmitter and receiver on and off |
---|
1427 | * Inputs: none |
---|
1428 | * Outputs: none |
---|
1429 | * Errors: none |
---|
1430 | * Scope: private |
---|
1431 | ****************************************************************************/ |
---|
1432 | |
---|
1433 | static void inline SciEnableTransmitter( void ) |
---|
1434 | { |
---|
1435 | *SCCR1 |= SCI_ENABLE_XMTR; |
---|
1436 | } |
---|
1437 | |
---|
1438 | static void inline SciDisableTransmitter( void ) |
---|
1439 | { |
---|
1440 | *SCCR1 &= SCI_DISABLE_XMTR; |
---|
1441 | } |
---|
1442 | |
---|
1443 | static void inline SciEnableReceiver( void ) |
---|
1444 | { |
---|
1445 | *SCCR1 |= SCI_ENABLE_RCVR; |
---|
1446 | } |
---|
1447 | |
---|
1448 | static void inline SciDisableReceiver( void ) |
---|
1449 | { |
---|
1450 | *SCCR1 &= SCI_DISABLE_RCVR; |
---|
1451 | } |
---|
1452 | |
---|
1453 | |
---|
1454 | /**************************************************************************** |
---|
1455 | * Func: SciWriteCharWait |
---|
1456 | * Desc: wait for room in the fifo and then put a char in |
---|
1457 | * Inputs: a byte to send |
---|
1458 | * Outputs: none |
---|
1459 | * Errors: none |
---|
1460 | * Scope: public |
---|
1461 | ****************************************************************************/ |
---|
1462 | |
---|
1463 | void SciWriteCharWait(unsigned8 c) |
---|
1464 | { |
---|
1465 | // poll the fifo, waiting for room for another character |
---|
1466 | |
---|
1467 | while ( ( *SCSR & SCI_XMTR_AVAILABLE ) == 0 ) |
---|
1468 | { |
---|
1469 | /* Either we are writing to the fifo faster than |
---|
1470 | * the uart can clock bytes out onto the cable, |
---|
1471 | * or we are in flow control (actually no, we |
---|
1472 | * are ignoring flow control from the other end). |
---|
1473 | * In the first case, higher baud rates will help. |
---|
1474 | */ |
---|
1475 | /* relinquish processor while waiting */ |
---|
1476 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
---|
1477 | } |
---|
1478 | |
---|
1479 | *SCDR = c; // send the charcter |
---|
1480 | |
---|
1481 | SciBytesOut++; // increment the counter |
---|
1482 | |
---|
1483 | return; |
---|
1484 | } |
---|
1485 | |
---|
1486 | |
---|
1487 | /**************************************************************************** |
---|
1488 | * Func: SciWriteCharNoWait |
---|
1489 | * Desc: if no room in the fifo throw the char on the floor |
---|
1490 | * Inputs: a byte to send |
---|
1491 | * Outputs: none |
---|
1492 | * Errors: none |
---|
1493 | * Scope: public |
---|
1494 | ****************************************************************************/ |
---|
1495 | |
---|
1496 | void SciWriteCharNoWait(unsigned8 c) |
---|
1497 | { |
---|
1498 | if ( ( *SCSR & SCI_XMTR_AVAILABLE ) == 0 ) |
---|
1499 | { |
---|
1500 | return; // no room, throw it away |
---|
1501 | } |
---|
1502 | |
---|
1503 | *SCDR = c; // put the char in the fifo |
---|
1504 | |
---|
1505 | SciBytesOut++; // increment the counter |
---|
1506 | |
---|
1507 | return; |
---|
1508 | } |
---|
1509 | |
---|
1510 | |
---|
1511 | /**************************************************************************** |
---|
1512 | * Func: SciReadCharWait |
---|
1513 | * Desc: read a character, waiting for one to show up, if need be |
---|
1514 | * Inputs: none |
---|
1515 | * Outputs: a character |
---|
1516 | * Errors: none |
---|
1517 | * Scope: public |
---|
1518 | ****************************************************************************/ |
---|
1519 | |
---|
1520 | unsigned8 inline SciReadCharWait( void ) |
---|
1521 | { |
---|
1522 | unsigned8 ch; |
---|
1523 | |
---|
1524 | while ( SciCharAvailable() == 0 ) // anything there? |
---|
1525 | { |
---|
1526 | /* relinquish processor while waiting */ |
---|
1527 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
---|
1528 | } |
---|
1529 | |
---|
1530 | // if you have rcv ints enabled, then the isr will probably |
---|
1531 | // get the character before you will unless you turn off ints |
---|
1532 | // ie polling and ints don't mix that well |
---|
1533 | |
---|
1534 | ch = *SCDR; // get the charcter |
---|
1535 | |
---|
1536 | SciBytesIn++; // increment the counter |
---|
1537 | |
---|
1538 | return ch; // return the char |
---|
1539 | } |
---|
1540 | |
---|
1541 | |
---|
1542 | /**************************************************************************** |
---|
1543 | * Func: SciReadCharNoWait |
---|
1544 | * Desc: try to get a char but dont wait for one |
---|
1545 | * Inputs: none |
---|
1546 | * Outputs: a character or -1 if none |
---|
1547 | * Errors: none |
---|
1548 | * Scope: public |
---|
1549 | ****************************************************************************/ |
---|
1550 | |
---|
1551 | unsigned8 inline SciReadCharNoWait( void ) |
---|
1552 | { |
---|
1553 | unsigned8 ch; |
---|
1554 | |
---|
1555 | if ( SciCharAvailable() == 0 ) // anything there? |
---|
1556 | return -1; |
---|
1557 | |
---|
1558 | ch = *SCDR; // get the character |
---|
1559 | |
---|
1560 | SciBytesIn++; // increment the count |
---|
1561 | |
---|
1562 | return ch; // return the char |
---|
1563 | } |
---|
1564 | |
---|
1565 | |
---|
1566 | |
---|
1567 | /**************************************************************************** |
---|
1568 | * Func: SciCharAvailable |
---|
1569 | * Desc: is there a receive character in the data register |
---|
1570 | * Inputs: none |
---|
1571 | * Outputs: false if no char available, else true |
---|
1572 | * Errors: none |
---|
1573 | * Scope: public |
---|
1574 | ****************************************************************************/ |
---|
1575 | |
---|
1576 | unsigned8 inline SciCharAvailable( void ) |
---|
1577 | { |
---|
1578 | return ( *SCSR & SCI_RCVR_READY ); // char in data register? |
---|
1579 | } |
---|
1580 | |
---|
1581 | |
---|
1582 | /**************************************************************************** |
---|
1583 | * Func: SciSendBreak |
---|
1584 | * Desc: send 1 or tow breaks (all zero bits) |
---|
1585 | * Inputs: none |
---|
1586 | * Outputs: none |
---|
1587 | * Errors: none |
---|
1588 | * Scope: public |
---|
1589 | ****************************************************************************/ |
---|
1590 | |
---|
1591 | void SciSendBreak( void ) |
---|
1592 | { |
---|
1593 | // From the Motorola QSM reference manual - |
---|
1594 | |
---|
1595 | // "if SBK is toggled by writing it first to a one and then immediately |
---|
1596 | // to a zero (in less than one serial frame interval), the transmitter |
---|
1597 | // sends only one or two break frames before reverting to mark (idle) |
---|
1598 | // or before commencing to send more data" |
---|
1599 | |
---|
1600 | *SCCR1 |= SCI_SEND_BREAK; // set the bit |
---|
1601 | |
---|
1602 | *SCCR1 &= ~SCI_SEND_BREAK; // clear the bit |
---|
1603 | |
---|
1604 | return; |
---|
1605 | } |
---|
1606 | |
---|
1607 | |
---|
1608 | ///////////////////////////////////////////////////////////////////////////// |
---|
1609 | // |
---|
1610 | // SECTION 6 |
---|
1611 | // TEST CODE |
---|
1612 | // |
---|
1613 | ///////////////////////////////////////////////////////////////////////////// |
---|
1614 | |
---|
1615 | |
---|
1616 | /**************************************************************************** |
---|
1617 | * Func: SciUnitTest |
---|
1618 | * Desc: test the device driver |
---|
1619 | * Inputs: nothing |
---|
1620 | * Outputs: nothing |
---|
1621 | * Scope: public |
---|
1622 | ****************************************************************************/ |
---|
1623 | |
---|
1624 | #if 0 |
---|
1625 | #define O_RDWR LIBIO_FLAGS_READ_WRITE // dont like this but... |
---|
1626 | |
---|
1627 | void SciUnitTest() |
---|
1628 | { |
---|
1629 | unsigned8 byte; // a character |
---|
1630 | unsigned16 fd; // file descriptor for device |
---|
1631 | unsigned16 result; // result of ioctl |
---|
1632 | |
---|
1633 | |
---|
1634 | fd = open("/dev/sci",O_RDWR); // open the device |
---|
1635 | |
---|
1636 | printk("SCI open fd=%d\r\n",fd); |
---|
1637 | |
---|
1638 | |
---|
1639 | result = write(fd, "abcd\r\n", 6); // send a string |
---|
1640 | |
---|
1641 | printk("SCI write result=%d\r\n",result); |
---|
1642 | |
---|
1643 | |
---|
1644 | result = read(fd, &byte, 1); // read a byte |
---|
1645 | |
---|
1646 | printk("SCI read result=%d,byte=%x\r\n",result,byte); |
---|
1647 | |
---|
1648 | return; |
---|
1649 | } |
---|
1650 | #endif |
---|
1651 | |
---|
1652 | |
---|
1653 | /**************************************************************************** |
---|
1654 | * Func: SciPrintStats |
---|
1655 | * Desc: print out some driver information |
---|
1656 | * Inputs: nothing |
---|
1657 | * Outputs: nothing |
---|
1658 | * Scope: public |
---|
1659 | ****************************************************************************/ |
---|
1660 | |
---|
1661 | void SciPrintStats ( void ) |
---|
1662 | { |
---|
1663 | printk("\r\n"); |
---|
1664 | |
---|
1665 | printk( "SYS_CLOCK is %2.6f Mhz\r\n\n", SYS_CLOCK / 1000000.0 ); |
---|
1666 | |
---|
1667 | printk( "Current baud rate is %d bps or %d cps\r\n\n", SciBaud, SciBaud / 10 ); |
---|
1668 | |
---|
1669 | printk( "SCI Uart chars in %8d\r\n", SciBytesIn ); |
---|
1670 | printk( "SCI Uart chars out %8d\r\n", SciBytesOut ); |
---|
1671 | printk( "SCI Uart framing errors %8d\r\n", SciErrorsFraming ); |
---|
1672 | printk( "SCI Uart parity errors %8d\r\n", SciErrorsParity ); |
---|
1673 | printk( "SCI Uart overrun errors %8d\r\n", SciErrorsOverrun ); |
---|
1674 | printk( "SCI Uart noise errors %8d\r\n", SciErrorsNoise ); |
---|
1675 | |
---|
1676 | return; |
---|
1677 | } |
---|
1678 | |
---|
1679 | |
---|
1680 | |
---|