1 | /* |
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2 | * Copyright (c) 2017 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <info@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <bsp.h> |
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16 | #include <bsp/fatal.h> |
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17 | #include <bsp/irq.h> |
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18 | #include <bsp/irq-generic.h> |
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19 | |
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20 | #include <rtems/counter.h> |
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21 | #include <rtems/sysinit.h> |
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22 | #include <rtems/timecounter.h> |
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23 | #include <rtems/score/smpimpl.h> |
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24 | |
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25 | #include <libcpu/arm-cp15.h> |
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26 | |
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27 | /* |
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28 | * Clock driver using the ARMv7-AR Generic Timer. The BSP must provide the |
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29 | * following function via <bsp.h>: |
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30 | * |
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31 | * void arm_generic_timer_get_config(uint32_t *frequency, uint32_t *irq); |
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32 | * |
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33 | * The BSP may optionally define ARM_GENERIC_TIMER_USE_VIRTUAL in <bsp.h> to |
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34 | * use the virtual timer instead of the physical timer. |
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35 | */ |
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36 | |
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37 | typedef struct { |
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38 | struct timecounter tc; |
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39 | uint32_t interval; |
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40 | rtems_vector_number irq; |
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41 | } arm_gt_clock_context; |
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42 | |
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43 | static arm_gt_clock_context arm_gt_clock_instance; |
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44 | |
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45 | /* This is defined in clockdrv_shell.h */ |
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46 | void Clock_isr(rtems_irq_hdl_param arg); |
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47 | |
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48 | static inline uint64_t arm_gt_clock_get_compare_value(void) |
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49 | { |
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50 | #ifdef ARM_GENERIC_TIMER_USE_VIRTUAL |
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51 | return arm_cp15_get_counter_pl1_virtual_compare_value(); |
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52 | #else |
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53 | return arm_cp15_get_counter_pl1_physical_compare_value(); |
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54 | #endif |
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55 | } |
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56 | |
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57 | static inline void arm_gt_clock_set_compare_value(uint64_t cval) |
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58 | { |
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59 | #ifdef ARM_GENERIC_TIMER_USE_VIRTUAL |
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60 | arm_cp15_set_counter_pl1_virtual_compare_value(cval); |
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61 | #else |
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62 | arm_cp15_set_counter_pl1_physical_compare_value(cval); |
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63 | #endif |
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64 | } |
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65 | |
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66 | static inline uint64_t arm_gt_clock_get_count(void) |
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67 | { |
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68 | #ifdef ARM_GENERIC_TIMER_USE_VIRTUAL |
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69 | return arm_cp15_get_counter_virtual_count(); |
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70 | #else |
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71 | return arm_cp15_get_counter_physical_count(); |
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72 | #endif |
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73 | } |
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74 | |
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75 | static inline void arm_gt_clock_set_control(uint32_t ctl) |
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76 | { |
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77 | #ifdef ARM_GENERIC_TIMER_USE_VIRTUAL |
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78 | arm_cp15_set_counter_pl1_virtual_timer_control(ctl); |
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79 | #else |
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80 | arm_cp15_set_counter_pl1_physical_timer_control(ctl); |
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81 | #endif |
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82 | } |
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83 | |
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84 | static void arm_gt_clock_at_tick(void) |
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85 | { |
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86 | uint64_t cval; |
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87 | uint32_t interval; |
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88 | |
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89 | interval = arm_gt_clock_instance.interval; |
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90 | cval = arm_gt_clock_get_compare_value(); |
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91 | cval += interval; |
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92 | arm_gt_clock_set_compare_value(cval); |
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93 | } |
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94 | |
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95 | static void arm_gt_clock_handler_install(void) |
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96 | { |
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97 | rtems_status_code sc; |
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98 | |
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99 | sc = rtems_interrupt_handler_install( |
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100 | arm_gt_clock_instance.irq, |
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101 | "Clock", |
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102 | RTEMS_INTERRUPT_UNIQUE, |
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103 | (rtems_interrupt_handler) Clock_isr, |
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104 | NULL |
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105 | ); |
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106 | if (sc != RTEMS_SUCCESSFUL) { |
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107 | bsp_fatal(BSP_ARM_FATAL_GENERIC_TIMER_CLOCK_IRQ_INSTALL); |
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108 | } |
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109 | } |
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110 | |
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111 | static uint32_t arm_gt_clock_get_timecount(struct timecounter *tc) |
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112 | { |
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113 | return (uint32_t) arm_gt_clock_get_count(); |
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114 | } |
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115 | |
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116 | static void arm_gt_clock_gt_init(uint64_t cval) |
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117 | { |
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118 | arm_gt_clock_set_compare_value(cval); |
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119 | arm_gt_clock_set_control(0x1); |
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120 | } |
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121 | |
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122 | #if defined(RTEMS_SMP) && !defined(CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR) |
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123 | static void arm_gt_clock_secondary_action(void *arg) |
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124 | { |
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125 | uint64_t *cval; |
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126 | |
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127 | cval = arg; |
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128 | arm_gt_clock_gt_init(*cval); |
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129 | bsp_interrupt_vector_enable(arm_gt_clock_instance.irq); |
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130 | } |
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131 | #endif |
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132 | |
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133 | static void arm_gt_clock_secondary_initialization(uint64_t cval) |
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134 | { |
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135 | #if defined(RTEMS_SMP) && !defined(CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR) |
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136 | _SMP_Before_multitasking_action_broadcast( |
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137 | arm_gt_clock_secondary_action, |
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138 | &cval |
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139 | ); |
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140 | #endif |
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141 | } |
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142 | |
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143 | static void arm_gt_clock_initialize(void) |
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144 | { |
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145 | uint64_t frequency; |
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146 | uint64_t us_per_tick; |
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147 | uint32_t interval; |
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148 | uint64_t cval; |
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149 | struct timecounter *tc; |
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150 | |
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151 | frequency = arm_gt_clock_instance.interval; |
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152 | us_per_tick = rtems_configuration_get_microseconds_per_tick(); |
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153 | interval = (uint32_t) ((frequency * us_per_tick) / 1000000); |
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154 | cval = arm_gt_clock_get_count(); |
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155 | cval += interval; |
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156 | arm_gt_clock_instance.interval = interval; |
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157 | |
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158 | arm_gt_clock_gt_init(cval); |
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159 | arm_gt_clock_secondary_initialization(cval); |
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160 | |
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161 | tc = &arm_gt_clock_instance.tc; |
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162 | tc->tc_get_timecount = arm_gt_clock_get_timecount; |
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163 | tc->tc_counter_mask = 0xffffffff; |
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164 | tc->tc_frequency = frequency; |
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165 | tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER; |
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166 | rtems_timecounter_install(tc); |
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167 | } |
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168 | |
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169 | CPU_Counter_ticks _CPU_Counter_read(void) |
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170 | { |
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171 | return (uint32_t) arm_gt_clock_get_count(); |
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172 | } |
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173 | |
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174 | static void arm_gt_clock_early_init(void) |
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175 | { |
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176 | arm_gt_clock_set_control(0x3); |
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177 | |
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178 | arm_generic_timer_get_config( |
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179 | &arm_gt_clock_instance.interval, |
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180 | &arm_gt_clock_instance.irq |
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181 | ); |
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182 | |
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183 | rtems_counter_initialize_converter(arm_gt_clock_instance.interval); |
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184 | } |
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185 | |
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186 | RTEMS_SYSINIT_ITEM( |
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187 | arm_gt_clock_early_init, |
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188 | RTEMS_SYSINIT_BSP_START, |
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189 | RTEMS_SYSINIT_ORDER_LAST |
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190 | ); |
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191 | |
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192 | #define Clock_driver_support_at_tick() \ |
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193 | arm_gt_clock_at_tick() |
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194 | |
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195 | #define Clock_driver_support_initialize_hardware() \ |
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196 | arm_gt_clock_initialize() |
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197 | |
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198 | #define Clock_driver_support_install_isr(isr, old_isr) \ |
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199 | do { \ |
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200 | arm_gt_clock_handler_install(); \ |
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201 | old_isr = NULL; \ |
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202 | } while (0) |
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203 | |
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204 | /* Include shared source clock driver code */ |
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205 | #include "../../shared/clockdrv_shell.h" |
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