+++ /dev/null
-/**
- * \file
- * <!--
- * Copyright 2003, 2004, 2005, 2006 Develer S.r.l. (http://www.develer.com/)
- * Copyright 2000 Bernardo Innocenti <bernie@develer.com>
- * This file is part of DevLib - See README.devlib for information.
- * -->
- *
- * \brief Hardware independent timer driver (implementation)
- *
- * \version $Id$
- * \author Bernardo Innocenti <bernie@develer.com>
- */
-
-/*#*
- *#* $Log$
- *#* Revision 1.32 2007/10/08 12:14:32 batt
- *#* Fix some review issues.
- *#*
- *#* Revision 1.31 2006/07/19 12:56:26 bernie
- *#* Convert to new Doxygen style.
- *#*
- *#* Revision 1.30 2006/02/24 00:26:49 bernie
- *#* Fixes for CONFIG_KERNEL.
- *#*
- *#* Revision 1.29 2006/02/17 22:24:07 bernie
- *#* Add MOD_CHECK() checks.
- *#*
- *#* Revision 1.28 2006/02/10 12:32:52 bernie
- *#* Update Copyright year.
- *#*
- *#* Revision 1.27 2005/11/27 03:04:08 bernie
- *#* Move test code to timer_test.c; Add OS_HOSTED support.
- *#*
- *#* Revision 1.26 2005/11/04 16:20:02 bernie
- *#* Fix reference to README.devlib in header.
- *#*
- *#* Revision 1.25 2005/07/19 07:26:37 bernie
- *#* Refactor to decouple timer ticks from milliseconds.
- *#*
- *#* Revision 1.24 2005/04/11 19:10:28 bernie
- *#* Include top-level headers from cfg/ subdir.
- *#*
- *#* Revision 1.23 2004/12/13 12:07:06 bernie
- *#* DISABLE_IRQSAVE/ENABLE_IRQRESTORE: Convert to IRQ_SAVE_DISABLE/IRQ_RESTORE.
- *#*
- *#* Revision 1.22 2004/12/08 09:12:09 bernie
- *#* Rename time_t to mtime_t.
- *#*
- *#* Revision 1.21 2004/11/28 23:20:25 bernie
- *#* Remove obsolete INITLIST macro.
- *#*
- *#* Revision 1.20 2004/11/16 20:59:06 bernie
- *#* Add watchdog timer support.
- *#*/
-
-#include "timer.h"
-#include <cfg/cpu.h>
-#include <cfg/os.h>
-#include <cfg/debug.h>
-#include <cfg/module.h>
-#include <appconfig.h>
-
-/*
- * Include platform-specific binding code if we're hosted.
- * Try the CPU specific one for bare-metal environments.
- */
-#if OS_HOSTED
- #include OS_CSOURCE(timer)
-#else
- #include CPU_CSOURCE(timer)
-#endif
-
-/*
- * Sanity check for config parameters required by this module.
- */
-#if !defined(CONFIG_KERNEL) || ((CONFIG_KERNEL != 0) && CONFIG_KERNEL != 1)
- #error CONFIG_KERNEL must be set to either 0 or 1 in config.h
-#endif
-#if !defined(CONFIG_WATCHDOG) || ((CONFIG_WATCHDOG != 0) && CONFIG_WATCHDOG != 1)
- #error CONFIG_WATCHDOG must be set to either 0 or 1 in config.h
-#endif
-
-#if CONFIG_WATCHDOG
- #include <drv/wdt.h>
-#endif
-
-#if CONFIG_KERNEL
- #include <config_kern.h>
- #if CONFIG_KERN_SIGNALS
- #include <kern/signal.h> /* sig_wait(), sig_check() */
- #include <kern/proc.h> /* proc_current() */
- #include <cfg/macros.h> /* BV() */
- #endif
-#endif
-
-
-/**
- * \def CONFIG_TIMER_STROBE
- *
- * This is a debug facility that can be used to
- * monitor timer interrupt activity on an external pin.
- *
- * To use strobes, redefine the macros TIMER_STROBE_ON,
- * TIMER_STROBE_OFF and TIMER_STROBE_INIT and set
- * CONFIG_TIMER_STROBE to 1.
- */
-#if !defined(CONFIG_TIMER_STROBE) || !CONFIG_TIMER_STROBE
- #define TIMER_STROBE_ON do {/*nop*/} while(0)
- #define TIMER_STROBE_OFF do {/*nop*/} while(0)
- #define TIMER_STROBE_INIT do {/*nop*/} while(0)
-#endif
-
-
-/// Master system clock (1 tick accuracy)
-volatile ticks_t _clock;
-
-
-#ifndef CONFIG_TIMER_DISABLE_EVENTS
-
-/**
- * List of active asynchronous timers.
- */
-REGISTER static List timers_queue;
-
-
-/**
- * Add the specified timer to the software timer service queue.
- * When the delay indicated by the timer expires, the timer
- * device will execute the event associated with it.
- *
- * \note Interrupt safe
- */
-void timer_add(Timer *timer)
-{
- Timer *node;
- cpuflags_t flags;
-
-
- /* Inserting timers twice causes mayhem. */
- ASSERT(timer->magic != TIMER_MAGIC_ACTIVE);
- DB(timer->magic = TIMER_MAGIC_ACTIVE;)
-
- IRQ_SAVE_DISABLE(flags);
-
- /* Calculate expiration time for this timer */
- timer->tick = _clock + timer->_delay;
-
- /*
- * Search for the first node whose expiration time is
- * greater than the timer we want to add.
- */
- node = (Timer *)LIST_HEAD(&timers_queue);
- while (node->link.succ)
- {
- /*
- * Stop just after the insertion point.
- * (this fancy compare takes care of wrap-arounds).
- */
- if (node->tick - timer->tick > 0)
- break;
-
- /* Go to next node */
- node = (Timer *)node->link.succ;
- }
-
- /* Enqueue timer request into the list */
- INSERT_BEFORE(&timer->link, &node->link);
-
- IRQ_RESTORE(flags);
-}
-
-
-/**
- * Remove a timer from the timer queue before it has expired.
- */
-Timer *timer_abort(Timer *timer)
-{
- ATOMIC(REMOVE(&timer->link));
- DB(timer->magic = TIMER_MAGIC_INACTIVE;)
-
- return timer;
-}
-
-#endif /* CONFIG_TIMER_DISABLE_EVENTS */
-
-
-/**
- * Wait for the specified amount of timer ticks.
- */
-void timer_delayTicks(ticks_t delay)
-{
-#if defined(IRQ_GETSTATE)
- /* We shouldn't sleep with interrupts disabled */
- ASSERT(IRQ_GETSTATE());
-#endif
-
-#if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS
- Timer t;
-
- ASSERT(!sig_check(SIG_SINGLE));
- timer_set_event_signal(&t, proc_current(), SIG_SINGLE);
- timer_setDelay(&t, delay);
- timer_add(&t);
- sig_wait(SIG_SINGLE);
-
-#else /* !CONFIG_KERN_SIGNALS */
-
- ticks_t start = timer_clock();
-
- /* Busy wait */
- while (timer_clock() - start < delay)
- {
-#if CONFIG_WATCHDOG
- wdt_reset();
-#endif
- }
-
-#endif /* !CONFIG_KERN_SIGNALS */
-}
-
-
-#ifndef CONFIG_TIMER_DISABLE_UDELAY
-
-/**
- * Busy wait until the specified amount of high-precision ticks have elapsed.
- *
- * \note This function is interrupt safe, the only
- * requirement is a running hardware timer.
- */
-void timer_busyWait(hptime_t delay)
-{
- hptime_t now, prev = timer_hw_hpread();
- hptime_t delta;
-
- for(;;)
- {
- now = timer_hw_hpread();
- /*
- * We rely on hptime_t being unsigned here to
- * reduce the modulo to an AND in the common
- * case of TIMER_HW_CNT.
- */
- delta = (now - prev) % TIMER_HW_CNT;
- if (delta >= delay)
- break;
- delay -= delta;
- prev = now;
- }
-}
-
-/**
- * Wait for the specified amount of time (expressed in microseconds).
- *
- * \bug In AVR arch the maximum amount of time that can be used as
- * delay could be very limited, depending on the hardware timer
- * used. Check timer_avr.h, and what register is used as hptime_t.
- */
-void timer_delayHp(hptime_t delay)
-{
- if (UNLIKELY(delay > us_to_hptime(1000)))
- {
- timer_delayTicks(delay / (TIMER_HW_HPTICKS_PER_SEC / TIMER_TICKS_PER_SEC));
- delay %= (TIMER_HW_HPTICKS_PER_SEC / TIMER_TICKS_PER_SEC);
- }
-
- timer_busyWait(delay);
-}
-#endif /* CONFIG_TIMER_DISABLE_UDELAY */
-
-
-/**
- * Timer interrupt handler. Find soft timers expired and
- * trigger corresponding events.
- */
-DEFINE_TIMER_ISR
-{
- /*
- * With the Metrowerks compiler, the only way to force the compiler generate
- * an interrupt service routine is to put a pragma directive within the function
- * body.
- */
- #ifdef __MWERKS__
- #pragma interrupt saveall
- #endif
-
-#ifndef CONFIG_TIMER_DISABLE_EVENTS
- Timer *timer;
-#endif
- /*
- * On systems sharing IRQ line and vector, this check is needed
- * to ensure that IRQ is generated by timer source.
- */
- if (!timer_hw_triggered())
- return;
-
- TIMER_STROBE_ON;
-
- /* Perform hw IRQ handling */
- timer_hw_irq();
-
- /* Update the master ms counter */
- ++_clock;
-
-#ifndef CONFIG_TIMER_DISABLE_EVENTS
- /*
- * Check the first timer request in the list and process
- * it when it has expired. Repeat this check until the
- * first node has not yet expired. Since the list is sorted
- * by expiry time, all the following requests are guaranteed
- * to expire later.
- */
- while ((timer = (Timer *)LIST_HEAD(&timers_queue))->link.succ)
- {
- /* This request in list has not yet expired? */
- if (_clock - timer->tick < 0)
- break;
-
- /* Retreat the expired timer */
- REMOVE(&timer->link);
- DB(timer->magic = TIMER_MAGIC_INACTIVE;)
-
- /* Execute the associated event */
- event_do(&timer->expire);
- }
-#endif /* CONFIG_TIMER_DISABLE_EVENTS */
-
- TIMER_STROBE_OFF;
-}
-
-MOD_DEFINE(timer)
-
-/**
- * Initialize timer
- */
-void timer_init(void)
-{
- TIMER_STROBE_INIT;
-
-#ifndef CONFIG_TIMER_DISABLE_EVENTS
- LIST_INIT(&timers_queue);
-#endif
-
- _clock = 0;
-
- timer_hw_init();
-
- MOD_INIT(timer);
-}
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