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annotate packages/devs/watchdog/current/src/mn10300.cxx @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents c38311975d4f
children 435cced73e2f
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1 //==========================================================================
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2 //
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3 // watchdog/mn10300.cxx
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4 //
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5 // Watchdog implementation for MN10300
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg
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36 // Date: 1999-02-18
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37 // Purpose: Watchdog class implementation
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38 // Description: Contains an implementation of the Watchdog class for use
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39 // with the MN10300 hardware watchdog timer.
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //==========================================================================
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44
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45 #include <pkgconf/system.h> // system configuration file
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46 #include <pkgconf/watchdog.h> // configuration for this package
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47
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48 #if defined(CYGPKG_HAL_MN10300) && !defined(CYGIMP_WATCHDOG_EMULATE)
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49
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50 #include <pkgconf/kernel.h> // Kernel config
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51
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52 #include <cyg/kernel/ktypes.h> // base kernel types
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53 #include <cyg/infra/cyg_trac.h> // tracing macros
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54 #include <cyg/infra/cyg_ass.h> // assertion macros
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55 #include <cyg/kernel/instrmnt.h> // instrumentation
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56
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57 #include <cyg/hal/hal_io.h> // IO register access
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58
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59 #include <cyg/kernel/sched.hxx> // scheduler
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60 #include <cyg/kernel/intr.hxx> // interrupts
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61
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62 #include <cyg/kernel/sched.inl> // scheduler inlines
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63
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64 #include <cyg/devs/watchdog.hxx> // my header
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65
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66 // -------------------------------------------------------------------------
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67 // MN10300 watchdog timer registers
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68
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69 #if defined(CYGPKG_HAL_MN10300_AM31)
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70
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71 #define WATCHDOG_BASE 0x34004000
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72 #define WATCHDOG_COUNTER (WATCHDOG_BASE)
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73 #define WATCHDOG_CONTROL (WATCHDOG_BASE+2)
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74 #define WATCHDOG_RESET (WATCHDOG_BASE+4)
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75
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76 #define WATCHDOG_WDCK0 0x07
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77 #define WATCHDOG_WDCK0_DEFAULT 0x04 // 1016.801ms cycle
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78 #define WATCHDOG_WDRST 0x40
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79 #define WATCHDOG_WDCNE 0x80
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80
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81 #define WATCHDOG_RESOLUTION 1016801000 // cycle time in nanoseconds
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82
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83 #else
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84
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85 #error Unsupported MN10300 variant
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86
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87 #endif
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88
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89 // -------------------------------------------------------------------------
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90 // Forward definitions
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91
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92 static cyg_ISR watchdog_isr;
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93 static cyg_DSR watchdog_dsr;
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94
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95 // -------------------------------------------------------------------------
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96 // Statics
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97
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98 // A static pointer to the single system defined watchdog device.
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99 Cyg_Watchdog Cyg_Watchdog::watchdog;
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100
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101 // Interrupt object
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102 static Cyg_Interrupt interrupt(
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103 CYGNUM_HAL_INTERRUPT_WATCHDOG,
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104 0,
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105 0,
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106 watchdog_isr,
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107 watchdog_dsr
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108 );
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109
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110 // -------------------------------------------------------------------------
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111 // Constructor
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112
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113
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114 Cyg_Watchdog::Cyg_Watchdog()
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115 {
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116 CYG_REPORT_FUNCTION();
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117
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118 action_list = 0;
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119
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120 resolution = WATCHDOG_RESOLUTION;
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121
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122 CYG_REPORT_RETURN();
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123 }
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124
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125 // -------------------------------------------------------------------------
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126 // Return reset resolution
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127
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128 cyg_uint64 Cyg_Watchdog::get_resolution()
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129 {
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130 return resolution;
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131 }
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132
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133
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134 // -------------------------------------------------------------------------
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135 // Start the watchdog running.
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136
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137 void
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138 Cyg_Watchdog::start()
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139 {
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140 CYG_REPORT_FUNCTION();
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141
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142 interrupt.attach();
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143
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144 HAL_WRITE_UINT8( WATCHDOG_COUNTER, 0 );
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145
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146 // Set overflow cycle
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147 // Enable and reset counter
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148 HAL_WRITE_UINT8( WATCHDOG_CONTROL,
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149 WATCHDOG_WDCK0_DEFAULT|WATCHDOG_WDCNE|WATCHDOG_WDRST);
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150
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151 CYG_REPORT_RETURN();
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152 }
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153
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154 // -------------------------------------------------------------------------
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155 // Reset watchdog timer. This needs to be called regularly to prevent
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156 // the watchdog firing.
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157
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158 void
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159 Cyg_Watchdog::reset()
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160 {
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161 CYG_REPORT_FUNCTION();
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162
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163 cyg_uint8 ctrl;
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164
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165 HAL_READ_UINT8( WATCHDOG_CONTROL, ctrl );
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166
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167 ctrl |= WATCHDOG_WDRST;
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168
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169 HAL_WRITE_UINT8( WATCHDOG_CONTROL, ctrl );
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170
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171 CYG_REPORT_RETURN();
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172 }
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173
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174 // -------------------------------------------------------------------------
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175 // Trigger the watchdog as if the timer had expired.
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176
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177 void
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178 Cyg_Watchdog::trigger()
0
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179 {
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180 CYG_REPORT_FUNCTION();
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181
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182 Cyg_Scheduler::lock();
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183
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184 // Disable interrupt just in case
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185 interrupt.detach();
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186
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187 // Turn watchdog off to prevent it re-triggering.
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188 HAL_WRITE_UINT8( WATCHDOG_CONTROL, 0 );
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189
0
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190 Cyg_Watchdog_Action *act = action_list;
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191
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192 while( 0 != act )
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193 {
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194 act->action( act->data );
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195
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196 act = act->next;
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197 }
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198
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199 Cyg_Scheduler::unlock();
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200
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201 CYG_REPORT_RETURN();
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202 }
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203
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204 // -------------------------------------------------------------------------
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205 // Register an action routine that will be called when the timer
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206 // triggers.
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207
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208 void
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209 Cyg_Watchdog::install_action( Cyg_Watchdog_Action *action )
0
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210 {
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211 CYG_REPORT_FUNCTION();
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212
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213 Cyg_Scheduler::lock();
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214
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215 action->next = action_list;
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216 action_list = action;
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217
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218 Cyg_Scheduler::unlock();
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219
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220 CYG_REPORT_RETURN();
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221 }
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222
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223 // -------------------------------------------------------------------------
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224 // Deregister a previously registered action routine.
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225
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226 void
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227 Cyg_Watchdog::uninstall_action( Cyg_Watchdog_Action *action )
0
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228 {
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229 CYG_REPORT_FUNCTION();
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230
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231 Cyg_Scheduler::lock();
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232
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233 Cyg_Watchdog_Action **act_ptr = &action_list;
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234
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235 while( 0 != *act_ptr )
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236 {
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237 Cyg_Watchdog_Action *a = *act_ptr;
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238
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239 if( a == action )
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240 {
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241 *act_ptr = a->next;
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242 break;
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243 }
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244 act_ptr = &a->next;
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245 }
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246
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247 Cyg_Scheduler::unlock();
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248
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249 CYG_REPORT_RETURN();
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250 }
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251
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252 // -------------------------------------------------------------------------
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253 // ISR and DSR
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254
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255 cyg_uint32
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256 watchdog_isr( cyg_vector vector, CYG_ADDRWORD data)
0
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257 {
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258 CYG_REPORT_FUNCTION();
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259
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260 Cyg_Watchdog::watchdog.trigger();
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261
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262 CYG_REPORT_RETURN();
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263
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264 // FIXME: why is this 0??? why not Cyg_Interrupt::HANDLED? - Jifl
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265 return 0;
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266 }
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267
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268 void
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269 watchdog_dsr(cyg_vector vector, cyg_ucount32 count, CYG_ADDRWORD data)
0
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270 {
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271 }
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272
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273 #endif // defined(CYGPKG_HAL_MN10300) &&
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274 // !defined(CYGIMP_WATCHDOG_EMULATE)
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275 // -------------------------------------------------------------------------
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276 // EOF watchdog/mn10300.cxx