forked from Imagelibrary/rtems
7ee5931393
The aim of this clock driver hook was to stop clock tick interrupts at some late point in the exit() procedure. The use of atexit() pulls in malloc() which pulls in errno. It is incompatible with the intention of the CONFIGURE_DISABLE_NEWLIB_REENTRANCY configuration option. The exit() function must be called from thread context, so accompanied clock tick interrupts should cause no harm. On the contrary, someone may assume a normal operating system operation, e.g. working timeouts. Remove the Clock_driver_support_shutdown_hardware() clock driver hook. Close #3436.
117 lines
2.8 KiB
C
117 lines
2.8 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/dev/clock/clockimpl.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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#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) \
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lpc_clock_handler_install()
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/* Include shared source clock driver code */
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#include "../../../shared/dev/clock/clockimpl.h"
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#endif /* ARM_MULTILIB_ARCH_V4 */
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