forked from Imagelibrary/rtems
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/**
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* @file
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*
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* @ingroup lpc_clock
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*
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* @brief Clock driver configuration.
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*/
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/*
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* Copyright (c) 2009-2015 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <rtems.h>
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#include <rtems/timecounter.h>
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#include <bsp/lpc-clock-config.h>
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#include <bsp/lpc-timer.h>
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#ifdef ARM_MULTILIB_ARCH_V4
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/* This is defined in ../../../shared/clockdrv_shell.h */
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void Clock_isr(rtems_irq_hdl_param arg);
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static volatile lpc_timer *const lpc_clock =
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(volatile lpc_timer *) LPC_CLOCK_TIMER_BASE;
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static volatile lpc_timer *const lpc_timecounter =
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(volatile lpc_timer *) LPC_CLOCK_TIMECOUNTER_BASE;
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static struct timecounter lpc_clock_tc;
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static uint32_t lpc_clock_tc_get_timecount(struct timecounter *tc)
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{
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return lpc_timecounter->tc;
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}
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static void lpc_clock_at_tick(void)
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{
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lpc_clock->ir = LPC_TIMER_IR_MR0;
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}
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static void lpc_clock_handler_install(void)
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{
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rtems_status_code sc = RTEMS_SUCCESSFUL;
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sc = rtems_interrupt_handler_install(
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LPC_CLOCK_INTERRUPT,
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"Clock",
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RTEMS_INTERRUPT_UNIQUE,
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(rtems_interrupt_handler) Clock_isr,
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NULL
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);
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if (sc != RTEMS_SUCCESSFUL) {
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rtems_fatal_error_occurred(0xdeadbeef);
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}
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}
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static void lpc_clock_initialize(void)
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{
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uint64_t interval = ((uint64_t) LPC_CLOCK_REFERENCE
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* (uint64_t) rtems_configuration_get_microseconds_per_tick()) / 1000000;
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/* Enable module */
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LPC_CLOCK_MODULE_ENABLE();
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/* Reset timer */
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lpc_clock->tcr = LPC_TIMER_TCR_RST;
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/* Clear interrupt flags */
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lpc_clock->ir = LPC_TIMER_IR_ALL;
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/* Set timer mode */
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lpc_clock->ccr = 0;
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/* Timer is incremented every PERIPH_CLK tick */
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lpc_clock->pr = 0;
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/* Set match registers */
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lpc_clock->mr0 = (uint32_t) interval;
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/* Generate interrupt and reset counter on match with MR0 */
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lpc_clock->mcr = LPC_TIMER_MCR_MR0_INTR | LPC_TIMER_MCR_MR0_RST;
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/* No external match */
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lpc_clock->emr = 0x0;
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/* Enable timer */
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lpc_clock->tcr = LPC_TIMER_TCR_EN;
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/* Install timecounter */
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lpc_clock_tc.tc_get_timecount = lpc_clock_tc_get_timecount;
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lpc_clock_tc.tc_counter_mask = 0xffffffff;
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lpc_clock_tc.tc_frequency = LPC_CLOCK_REFERENCE;
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lpc_clock_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
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rtems_timecounter_install(&lpc_clock_tc);
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}
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static void lpc_clock_cleanup(void)
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{
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rtems_status_code sc = RTEMS_SUCCESSFUL;
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/* Disable timer */
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lpc_clock->tcr = 0x0;
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/* Remove interrupt handler */
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sc = rtems_interrupt_handler_remove(
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LPC_CLOCK_INTERRUPT,
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(rtems_interrupt_handler) Clock_isr,
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NULL
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);
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if (sc != RTEMS_SUCCESSFUL) {
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rtems_fatal_error_occurred(0xdeadbeef);
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}
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}
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#define Clock_driver_support_at_tick() lpc_clock_at_tick()
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#define Clock_driver_support_initialize_hardware() lpc_clock_initialize()
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#define Clock_driver_support_install_isr(isr, old_isr) \
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do { \
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lpc_clock_handler_install(); \
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old_isr = NULL; \
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} while (0)
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#define Clock_driver_support_shutdown_hardware() lpc_clock_cleanup()
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/* Include shared source clock driver code */
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#include "../../../../shared/clockdrv_shell.h"
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#endif /* ARM_MULTILIB_ARCH_V4 */
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