[ffe7c0e] | 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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[f3b29236] | 198 | #define Clock_driver_support_install_isr(isr) \ |
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| 199 | arm_gt_clock_handler_install() |
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[ffe7c0e] | 200 | |
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| 201 | /* Include shared source clock driver code */ |
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| 202 | #include "../../shared/clockdrv_shell.h" |
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