[4407ee6] | 1 | /** |
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| 2 | * @file clock.c |
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| 3 | * |
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| 4 | * @ingroup tms570 |
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| 5 | * |
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| 6 | * @brief clock functions definitions. |
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| 7 | */ |
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| 8 | |
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| 9 | /* |
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| 10 | * Copyright (c) 2014 Premysl Houdek <kom541000@gmail.com> |
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| 11 | * |
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| 12 | * Google Summer of Code 2014 at |
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| 13 | * Czech Technical University in Prague |
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| 14 | * Zikova 1903/4 |
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| 15 | * 166 36 Praha 6 |
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| 16 | * Czech Republic |
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| 17 | * |
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| 18 | * Based on LPC24xx and LPC1768 BSP |
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| 19 | * by embedded brains GmbH and others |
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| 20 | * |
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| 21 | * The license and distribution terms for this file may be |
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| 22 | * found in the file LICENSE in this distribution or at |
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| 23 | * http://www.rtems.org/license/LICENSE. |
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| 24 | */ |
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| 25 | |
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| 26 | #include <stdlib.h> |
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| 27 | |
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| 28 | #include <rtems.h> |
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| 29 | #include <bsp.h> |
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| 30 | #include <bsp/irq.h> |
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| 31 | #include <bsp/tms570-rti.h> |
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[75acd9e] | 32 | #include <rtems/timecounter.h> |
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[4407ee6] | 33 | |
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[75acd9e] | 34 | static struct timecounter tms570_rti_tc; |
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| 35 | |
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[9588946] | 36 | static uint32_t tms570_rti_get_timecount(struct timecounter *tc) |
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[75acd9e] | 37 | { |
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[069560a] | 38 | return TMS570_RTI.CNT[0].FRCx; |
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[75acd9e] | 39 | } |
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[4407ee6] | 40 | |
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[602e395] | 41 | #ifndef TMS570_PREFERRED_TC_FREQUENCY |
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| 42 | /* |
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| 43 | * Define preferred main time base counter frequency |
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| 44 | * The value of 1MHz is the best matching RTEMS |
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| 45 | * timing system because then there is no need |
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| 46 | * to scale RTEMS configuration microseconds_per_tick |
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| 47 | * parameter |
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| 48 | */ |
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| 49 | #define TMS570_PREFERRED_TC_FREQUENCY 1000000 |
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| 50 | #endif /* TMS570_PREFERRED_TC_FREQUENCY */ |
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| 51 | |
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[4407ee6] | 52 | /** |
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| 53 | * @brief Initialize the HW peripheral for clock driver |
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| 54 | * |
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| 55 | * Clock driver is implemented by RTI module |
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| 56 | * |
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| 57 | * @retval Void |
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| 58 | */ |
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| 59 | static void tms570_clock_driver_support_initialize_hardware( void ) |
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| 60 | { |
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| 61 | |
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[602e395] | 62 | uint32_t microsec_per_tick; |
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| 63 | uint32_t tc_frequency; |
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| 64 | uint32_t tc_prescaler; |
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| 65 | uint32_t tc_increments_per_tick; |
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| 66 | |
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| 67 | microsec_per_tick = rtems_configuration_get_microseconds_per_tick(); |
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| 68 | tc_frequency = TMS570_PREFERRED_TC_FREQUENCY; |
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[4407ee6] | 69 | |
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[602e395] | 70 | tc_prescaler = (BSP_PLL_OUT_CLOCK + tc_frequency) / (tc_frequency * 2); |
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| 71 | |
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| 72 | /* Recompute actual most close frequency which can be realized */ |
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| 73 | tc_frequency = (BSP_PLL_OUT_CLOCK + tc_prescaler) / (tc_prescaler * 2); |
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| 74 | |
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| 75 | /* |
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| 76 | * Recompute tick period to adjust for configurable or exact |
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| 77 | * preferred time base 1 usec resolution. |
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| 78 | */ |
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| 79 | tc_increments_per_tick = ((uint64_t)microsec_per_tick * tc_frequency + |
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| 80 | 500000) / 1000000; |
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| 81 | |
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[4407ee6] | 82 | /* Hardware specific initialize */ |
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[069560a] | 83 | TMS570_RTI.GCTRL = 0; |
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| 84 | TMS570_RTI.CNT[0].CPUCx = tc_prescaler - 1; |
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[b2c252b] | 85 | TMS570_RTI.TBCTRL = TMS570_RTI_TBCTRL_INC; |
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[069560a] | 86 | TMS570_RTI.CAPCTRL = 0; |
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| 87 | TMS570_RTI.COMPCTRL = 0; |
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[4407ee6] | 88 | /* set counter to zero */ |
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[069560a] | 89 | TMS570_RTI.CNT[0].UCx = 0; |
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| 90 | TMS570_RTI.CNT[0].FRCx = 0; |
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[4407ee6] | 91 | /* clear interrupts*/ |
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[b2c252b] | 92 | TMS570_RTI.CLEARINTENA = TMS570_RTI_CLEARINTENA_CLEAROVL1INT | |
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| 93 | TMS570_RTI_CLEARINTENA_CLEAROVL0INT | |
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| 94 | TMS570_RTI_CLEARINTENA_CLEARTBINT | |
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| 95 | TMS570_RTI_CLEARINTENA_CLEARDMA3 | |
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| 96 | TMS570_RTI_CLEARINTENA_CLEARDMA2 | |
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| 97 | TMS570_RTI_CLEARINTENA_CLEARDMA1 | |
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| 98 | TMS570_RTI_CLEARINTENA_CLEARDMA0 | |
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| 99 | TMS570_RTI_CLEARINTENA_CLEARINT3 | |
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| 100 | TMS570_RTI_CLEARINTENA_CLEARINT2 | |
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| 101 | TMS570_RTI_CLEARINTENA_CLEARINT1 | |
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| 102 | TMS570_RTI_CLEARINTENA_CLEARINT0; |
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| 103 | TMS570_RTI.INTFLAG = TMS570_RTI_INTFLAG_OVL1INT | |
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| 104 | TMS570_RTI_INTFLAG_OVL0INT | |
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| 105 | TMS570_RTI_INTFLAG_TBINT | |
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| 106 | TMS570_RTI_INTFLAG_INT3 | |
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| 107 | TMS570_RTI_INTFLAG_INT2 | |
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| 108 | TMS570_RTI_INTFLAG_INT1 | |
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| 109 | TMS570_RTI_INTFLAG_INT0; |
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[4407ee6] | 110 | /* set timer */ |
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[069560a] | 111 | TMS570_RTI.CMP[0].COMPx = TMS570_RTI.CNT[0].FRCx + tc_increments_per_tick; |
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| 112 | TMS570_RTI.COMP0CLR = TMS570_RTI.CMP[0].COMPx + tc_increments_per_tick / 2; |
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| 113 | TMS570_RTI.CMP[0].UDCPx = tc_increments_per_tick; |
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[4407ee6] | 114 | /* enable interupt */ |
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[b2c252b] | 115 | TMS570_RTI.SETINTENA = TMS570_RTI_SETINTENA_SETINT0; |
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[4407ee6] | 116 | /* enable timer */ |
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[b2c252b] | 117 | TMS570_RTI.GCTRL = TMS570_RTI_GCTRL_CNT0EN; |
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[75acd9e] | 118 | /* set timecounter */ |
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| 119 | tms570_rti_tc.tc_get_timecount = tms570_rti_get_timecount; |
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| 120 | tms570_rti_tc.tc_counter_mask = 0xffffffff; |
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[602e395] | 121 | tms570_rti_tc.tc_frequency = tc_frequency; |
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[75acd9e] | 122 | tms570_rti_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER; |
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| 123 | rtems_timecounter_install(&tms570_rti_tc); |
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[4407ee6] | 124 | } |
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| 125 | |
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| 126 | /** |
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| 127 | * @brief Clears interrupt source |
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| 128 | * |
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| 129 | * @retval Void |
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| 130 | */ |
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| 131 | static void tms570_clock_driver_support_at_tick( void ) |
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| 132 | { |
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[b2c252b] | 133 | TMS570_RTI.INTFLAG = TMS570_RTI_INTFLAG_INT0; |
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[4407ee6] | 134 | } |
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| 135 | |
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| 136 | /** |
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| 137 | * @brief registers RTI interrupt handler |
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| 138 | * |
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| 139 | * @param[in] Clock_isr new ISR handler |
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| 140 | * @param[in] Old_ticker old ISR handler (unused and type broken) |
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| 141 | * |
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| 142 | * @retval Void |
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| 143 | */ |
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| 144 | static void tms570_clock_driver_support_install_isr( |
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| 145 | rtems_isr_entry Clock_isr |
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| 146 | ) |
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| 147 | { |
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| 148 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 149 | |
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| 150 | sc = rtems_interrupt_handler_install( |
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| 151 | TMS570_IRQ_TIMER_0, |
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| 152 | "Clock", |
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| 153 | RTEMS_INTERRUPT_UNIQUE, |
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| 154 | (rtems_interrupt_handler) Clock_isr, |
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| 155 | NULL |
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| 156 | ); |
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| 157 | if ( sc != RTEMS_SUCCESSFUL ) { |
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| 158 | rtems_fatal_error_occurred(0xdeadbeef); |
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| 159 | } |
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| 160 | } |
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| 161 | |
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| 162 | /** |
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| 163 | * @brief disables RTI interrupt |
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| 164 | * |
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| 165 | * Called when closing clock driver |
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| 166 | * |
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| 167 | * @retval Void |
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| 168 | */ |
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| 169 | static void tms570_clock_driver_support_shutdown_hardware( void ) |
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| 170 | { |
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| 171 | /* turn off the timer interrupts */ |
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[b2c252b] | 172 | TMS570_RTI.CLEARINTENA = TMS570_RTI_CLEARINTENA_CLEAROVL0INT | |
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| 173 | TMS570_RTI_CLEARINTENA_CLEARINT0; |
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[4407ee6] | 174 | } |
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| 175 | |
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| 176 | #define Clock_driver_support_initialize_hardware \ |
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| 177 | tms570_clock_driver_support_initialize_hardware |
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| 178 | #define Clock_driver_support_at_tick \ |
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| 179 | tms570_clock_driver_support_at_tick |
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| 180 | #define Clock_driver_support_initialize_hardware \ |
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| 181 | tms570_clock_driver_support_initialize_hardware |
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| 182 | #define Clock_driver_support_shutdown_hardware \ |
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| 183 | tms570_clock_driver_support_shutdown_hardware |
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| 184 | |
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| 185 | #define Clock_driver_support_install_isr(Clock_isr, Old_ticker ) \ |
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| 186 | tms570_clock_driver_support_install_isr( Clock_isr ) |
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| 187 | |
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| 188 | void Clock_isr(void *arg); /* to supress warning */ |
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| 189 | |
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| 190 | #include "../../../shared/clockdrv_shell.h" |
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