1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup bsp_clock |
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5 | * |
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6 | * @brief Clock Tick Device Driver Shell |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 1989-2014. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #include <stdlib.h> |
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19 | |
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20 | #include <bsp.h> |
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21 | #include <rtems/clockdrv.h> |
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22 | #include <rtems/score/percpu.h> |
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23 | #include <rtems/score/smpimpl.h> |
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24 | |
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25 | #ifdef Clock_driver_nanoseconds_since_last_tick |
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26 | #error "Update driver to use the timecounter instead of nanoseconds extension" |
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27 | #endif |
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28 | |
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29 | /** |
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30 | * @defgroup bsp_clock Clock Support |
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31 | * |
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32 | * @ingroup bsp_shared |
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33 | * |
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34 | * @brief Clock support |
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35 | * |
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36 | */ |
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37 | #if CLOCK_DRIVER_USE_FAST_IDLE && CLOCK_DRIVER_ISRS_PER_TICK |
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38 | #error "clockdrv_shell.h: Fast Idle PLUS n ISRs per tick is not supported" |
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39 | #endif |
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40 | |
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41 | /** |
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42 | * @brief This method is rarely used so default it. |
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43 | */ |
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44 | #ifndef Clock_driver_support_find_timer |
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45 | #define Clock_driver_support_find_timer() |
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46 | #endif |
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47 | |
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48 | /** |
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49 | * @brief Do nothing by default. |
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50 | */ |
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51 | #ifndef Clock_driver_support_at_tick |
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52 | #define Clock_driver_support_at_tick() |
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53 | #endif |
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54 | |
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55 | /** |
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56 | * @brief Do nothing by default. |
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57 | */ |
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58 | #ifndef Clock_driver_support_set_interrupt_affinity |
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59 | #define Clock_driver_support_set_interrupt_affinity(online_processors) |
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60 | #endif |
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61 | |
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62 | /* |
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63 | * A specialized clock driver may use for example rtems_timecounter_tick_simple() |
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64 | * instead of the default. |
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65 | */ |
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66 | #ifndef Clock_driver_timecounter_tick |
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67 | #ifdef CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER |
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68 | #define Clock_driver_timecounter_tick() rtems_clock_tick() |
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69 | #else |
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70 | #define Clock_driver_timecounter_tick() rtems_timecounter_tick() |
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71 | #endif |
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72 | #endif |
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73 | |
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74 | /** |
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75 | * @brief ISRs until next clock tick |
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76 | */ |
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77 | #if CLOCK_DRIVER_ISRS_PER_TICK |
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78 | volatile uint32_t Clock_driver_isrs; |
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79 | #endif |
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80 | |
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81 | /** |
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82 | * @brief Clock ticks since initialization |
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83 | */ |
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84 | volatile uint32_t Clock_driver_ticks; |
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85 | |
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86 | void Clock_exit( void ); |
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87 | |
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88 | /** |
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89 | * @brief Clock_isr |
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90 | * |
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91 | * This is the clock tick interrupt handler. |
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92 | * |
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93 | * @param vector Vector number. |
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94 | */ |
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95 | #if defined(BSP_FEATURE_IRQ_EXTENSION) || \ |
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96 | (CPU_SIMPLE_VECTORED_INTERRUPTS != TRUE) |
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97 | void Clock_isr(void *arg); |
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98 | void Clock_isr(void *arg) |
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99 | { |
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100 | #else |
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101 | rtems_isr Clock_isr(rtems_vector_number vector); |
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102 | rtems_isr Clock_isr( |
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103 | rtems_vector_number vector |
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104 | ) |
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105 | { |
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106 | #endif |
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107 | /* |
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108 | * Accurate count of ISRs |
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109 | */ |
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110 | Clock_driver_ticks += 1; |
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111 | |
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112 | #if CLOCK_DRIVER_USE_FAST_IDLE |
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113 | { |
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114 | struct timecounter *tc = _Timecounter; |
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115 | uint64_t us_per_tick = rtems_configuration_get_microseconds_per_tick(); |
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116 | uint32_t interval = (uint32_t) |
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117 | ((tc->tc_frequency * us_per_tick) / 1000000); |
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118 | |
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119 | Clock_driver_timecounter_tick(); |
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120 | |
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121 | while ( |
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122 | _Thread_Heir == _Thread_Executing |
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123 | && _Thread_Executing->Start.Entry.Kinds.Idle.entry |
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124 | == rtems_configuration_get_idle_task() |
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125 | ) { |
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126 | ISR_lock_Context lock_context; |
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127 | |
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128 | _Timecounter_Acquire(&lock_context); |
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129 | _Timecounter_Tick_simple( |
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130 | interval, |
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131 | (*tc->tc_get_timecount)(tc), |
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132 | &lock_context |
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133 | ); |
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134 | } |
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135 | |
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136 | Clock_driver_support_at_tick(); |
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137 | } |
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138 | #else |
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139 | /* |
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140 | * Do the hardware specific per-tick action. |
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141 | * |
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142 | * The counter/timer may or may not be set to automatically reload. |
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143 | */ |
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144 | Clock_driver_support_at_tick(); |
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145 | |
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146 | #if CLOCK_DRIVER_ISRS_PER_TICK |
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147 | /* |
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148 | * The driver is multiple ISRs per clock tick. |
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149 | */ |
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150 | if ( !Clock_driver_isrs ) { |
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151 | Clock_driver_timecounter_tick(); |
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152 | |
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153 | Clock_driver_isrs = CLOCK_DRIVER_ISRS_PER_TICK; |
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154 | } |
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155 | Clock_driver_isrs--; |
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156 | #else |
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157 | /* |
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158 | * The driver is one ISR per clock tick. |
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159 | */ |
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160 | Clock_driver_timecounter_tick(); |
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161 | #endif |
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162 | #endif |
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163 | } |
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164 | |
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165 | /** |
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166 | * @brief Clock_exit |
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167 | * |
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168 | * This routine allows the clock driver to exit by masking the interrupt and |
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169 | * disabling the clock's counter. |
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170 | */ |
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171 | void Clock_exit( void ) |
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172 | { |
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173 | Clock_driver_support_shutdown_hardware(); |
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174 | |
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175 | /* do not restore old vector */ |
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176 | } |
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177 | |
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178 | /** |
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179 | * @brief Clock_initialize |
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180 | * |
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181 | * This routine initializes the clock driver. |
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182 | * |
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183 | * @param[in] major Clock device major number. |
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184 | * @param[in] minor Clock device minor number. |
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185 | * @param[in] parg Pointer to optional device driver arguments |
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186 | * |
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187 | * @retval rtems_device_driver status code |
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188 | */ |
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189 | rtems_device_driver Clock_initialize( |
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190 | rtems_device_major_number major, |
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191 | rtems_device_minor_number minor, |
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192 | void *pargp |
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193 | ) |
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194 | { |
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195 | rtems_isr_entry Old_ticker; |
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196 | |
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197 | Clock_driver_ticks = 0; |
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198 | |
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199 | /* |
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200 | * Find timer -- some BSPs search buses for hardware timer |
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201 | */ |
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202 | Clock_driver_support_find_timer(); |
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203 | |
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204 | /* |
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205 | * Install vector |
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206 | */ |
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207 | (void) Old_ticker; |
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208 | Clock_driver_support_install_isr( Clock_isr, Old_ticker ); |
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209 | |
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210 | #ifdef RTEMS_SMP |
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211 | Clock_driver_support_set_interrupt_affinity( _SMP_Online_processors ); |
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212 | #endif |
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213 | |
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214 | /* |
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215 | * Now initialize the hardware that is the source of the tick ISR. |
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216 | */ |
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217 | Clock_driver_support_initialize_hardware(); |
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218 | |
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219 | atexit( Clock_exit ); |
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220 | |
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221 | /* |
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222 | * If we are counting ISRs per tick, then initialize the counter. |
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223 | */ |
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224 | #if CLOCK_DRIVER_ISRS_PER_TICK |
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225 | Clock_driver_isrs = CLOCK_DRIVER_ISRS_PER_TICK_VALUE; |
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226 | #endif |
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227 | |
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228 | return RTEMS_SUCCESSFUL; |
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229 | } |
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