[c468f18b] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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[7a6f8d0] | 4 | * @ingroup lpc_clock |
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[c468f18b] | 5 | * |
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| 6 | * @brief Clock driver configuration. |
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| 7 | */ |
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| 8 | |
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| 9 | /* |
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[75acd9e] | 10 | * Copyright (c) 2009-2015 embedded brains GmbH. All rights reserved. |
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[f6083f0] | 11 | * |
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| 12 | * embedded brains GmbH |
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[75acd9e] | 13 | * Dornierstr. 4 |
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[f6083f0] | 14 | * 82178 Puchheim |
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| 15 | * Germany |
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| 16 | * <rtems@embedded-brains.de> |
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[c468f18b] | 17 | * |
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| 18 | * The license and distribution terms for this file may be |
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| 19 | * found in the file LICENSE in this distribution or at |
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[c499856] | 20 | * http://www.rtems.org/license/LICENSE. |
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[c468f18b] | 21 | */ |
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| 22 | |
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[34c61517] | 23 | #include <rtems.h> |
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[75acd9e] | 24 | #include <rtems/timecounter.h> |
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[34c61517] | 25 | |
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[c468f18b] | 26 | #include <bsp/lpc-clock-config.h> |
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| 27 | #include <bsp/lpc-timer.h> |
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| 28 | |
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[34c61517] | 29 | #ifdef ARM_MULTILIB_ARCH_V4 |
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| 30 | |
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[c468f18b] | 31 | /* This is defined in ../../../shared/clockdrv_shell.h */ |
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[b2d9478] | 32 | void Clock_isr(rtems_irq_hdl_param arg); |
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[c468f18b] | 33 | |
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[f6083f0] | 34 | static volatile lpc_timer *const lpc_clock = |
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[c468f18b] | 35 | (volatile lpc_timer *) LPC_CLOCK_TIMER_BASE; |
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| 36 | |
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[75acd9e] | 37 | static volatile lpc_timer *const lpc_timecounter = |
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| 38 | (volatile lpc_timer *) LPC_CLOCK_TIMECOUNTER_BASE; |
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| 39 | |
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| 40 | static struct timecounter lpc_clock_tc; |
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| 41 | |
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| 42 | static uint32_t lpc_clock_tc_get_timecount(struct timecounter *tc) |
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| 43 | { |
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| 44 | return lpc_timecounter->tc; |
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| 45 | } |
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| 46 | |
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[c468f18b] | 47 | static void lpc_clock_at_tick(void) |
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| 48 | { |
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| 49 | lpc_clock->ir = LPC_TIMER_IR_MR0; |
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| 50 | } |
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| 51 | |
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| 52 | static void lpc_clock_handler_install(void) |
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| 53 | { |
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| 54 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 55 | |
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| 56 | sc = rtems_interrupt_handler_install( |
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| 57 | LPC_CLOCK_INTERRUPT, |
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| 58 | "Clock", |
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| 59 | RTEMS_INTERRUPT_UNIQUE, |
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| 60 | (rtems_interrupt_handler) Clock_isr, |
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| 61 | NULL |
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| 62 | ); |
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| 63 | if (sc != RTEMS_SUCCESSFUL) { |
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| 64 | rtems_fatal_error_occurred(0xdeadbeef); |
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| 65 | } |
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| 66 | } |
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| 67 | |
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| 68 | static void lpc_clock_initialize(void) |
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| 69 | { |
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| 70 | uint64_t interval = ((uint64_t) LPC_CLOCK_REFERENCE |
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| 71 | * (uint64_t) rtems_configuration_get_microseconds_per_tick()) / 1000000; |
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| 72 | |
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| 73 | /* Enable module */ |
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| 74 | LPC_CLOCK_MODULE_ENABLE(); |
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| 75 | |
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| 76 | /* Reset timer */ |
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| 77 | lpc_clock->tcr = LPC_TIMER_TCR_RST; |
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| 78 | |
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| 79 | /* Clear interrupt flags */ |
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| 80 | lpc_clock->ir = LPC_TIMER_IR_ALL; |
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| 81 | |
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| 82 | /* Set timer mode */ |
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| 83 | lpc_clock->ccr = 0; |
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| 84 | |
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| 85 | /* Timer is incremented every PERIPH_CLK tick */ |
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| 86 | lpc_clock->pr = 0; |
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| 87 | |
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| 88 | /* Set match registers */ |
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| 89 | lpc_clock->mr0 = (uint32_t) interval; |
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| 90 | |
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| 91 | /* Generate interrupt and reset counter on match with MR0 */ |
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| 92 | lpc_clock->mcr = LPC_TIMER_MCR_MR0_INTR | LPC_TIMER_MCR_MR0_RST; |
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| 93 | |
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| 94 | /* No external match */ |
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| 95 | lpc_clock->emr = 0x0; |
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| 96 | |
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| 97 | /* Enable timer */ |
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| 98 | lpc_clock->tcr = LPC_TIMER_TCR_EN; |
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[75acd9e] | 99 | |
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| 100 | /* Install timecounter */ |
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| 101 | lpc_clock_tc.tc_get_timecount = lpc_clock_tc_get_timecount; |
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| 102 | lpc_clock_tc.tc_counter_mask = 0xffffffff; |
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| 103 | lpc_clock_tc.tc_frequency = LPC_CLOCK_REFERENCE; |
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| 104 | lpc_clock_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER; |
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| 105 | rtems_timecounter_install(&lpc_clock_tc); |
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[c468f18b] | 106 | } |
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| 107 | |
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| 108 | static void lpc_clock_cleanup(void) |
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| 109 | { |
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| 110 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 111 | |
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| 112 | /* Disable timer */ |
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| 113 | lpc_clock->tcr = 0x0; |
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| 114 | |
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| 115 | /* Remove interrupt handler */ |
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| 116 | sc = rtems_interrupt_handler_remove( |
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| 117 | LPC_CLOCK_INTERRUPT, |
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| 118 | (rtems_interrupt_handler) Clock_isr, |
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| 119 | NULL |
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| 120 | ); |
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| 121 | if (sc != RTEMS_SUCCESSFUL) { |
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| 122 | rtems_fatal_error_occurred(0xdeadbeef); |
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| 123 | } |
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| 124 | } |
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| 125 | |
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| 126 | #define Clock_driver_support_at_tick() lpc_clock_at_tick() |
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| 127 | #define Clock_driver_support_initialize_hardware() lpc_clock_initialize() |
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| 128 | #define Clock_driver_support_install_isr(isr, old_isr) \ |
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[c193baad] | 129 | do { \ |
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| 130 | lpc_clock_handler_install(); \ |
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| 131 | old_isr = NULL; \ |
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| 132 | } while (0) |
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| 133 | |
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[c468f18b] | 134 | #define Clock_driver_support_shutdown_hardware() lpc_clock_cleanup() |
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| 135 | |
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| 136 | /* Include shared source clock driver code */ |
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| 137 | #include "../../../../shared/clockdrv_shell.h" |
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[34c61517] | 138 | |
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| 139 | #endif /* ARM_MULTILIB_ARCH_V4 */ |
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