+++ /dev/null
-/*!
- * \file
- * <!--
- * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
- * Copyright 2000 Bernardo Innocenti <bernie@develer.com>
- * This file is part of DevLib - See devlib/README for information.
- * -->
- *
- * \version $Id$
- *
- * \author Bernardo Innocenti <bernie@develer.com>
- *
- * \brief Hardware independent timer driver (implementation)
- */
-
-/*#*
- *#* $Log$
- *#* Revision 1.15 2004/09/14 21:07:18 bernie
- *#* Use debug.h instead of kdebug.h.
- *#*
- *#* Revision 1.14 2004/08/25 14:12:08 rasky
- *#* Aggiornato il comment block dei log RCS
- *#*
- *#* Revision 1.13 2004/08/10 06:59:09 bernie
- *#* timer_gettick(): Rename to timer_ticks() and add backwards compatibility inline.
- *#*
- *#* Revision 1.12 2004/08/08 05:59:37 bernie
- *#* Remove a few useless casts.
- *#*
- *#* Revision 1.11 2004/08/02 20:20:29 aleph
- *#* Merge from project_ks
- *#*
- *#* Revision 1.10 2004/07/30 14:15:53 rasky
- *#* Nuovo supporto unificato per detect della CPU
- *#*
- *#* Revision 1.9 2004/07/21 00:15:13 bernie
- *#* Put timer driver on diet.
- *#*
- *#* Revision 1.8 2004/07/18 21:57:07 bernie
- *#* Fix preprocessor warning with potentially undefined symbol.
- *#*
- *#* Revision 1.6 2004/06/07 18:10:06 aleph
- *#* Remove free pool of timers; use user-provided Timer structure instead
- *#*
- *#* Revision 1.5 2004/06/07 15:56:55 aleph
- *#* Some tabs cleanup and add timer strobe macros
- *#*
- *#* Revision 1.4 2004/06/06 18:25:44 bernie
- *#* Rename event macros to look like regular functions.
- *#*
- *#* Revision 1.3 2004/06/06 17:18:42 bernie
- *#* Fix \!CONFIG_KERN_SIGNALS code paths.
- *#*
- *#* Revision 1.2 2004/06/03 11:27:09 bernie
- *#* Add dual-license information.
- *#*
- *#* Revision 1.1 2004/05/23 18:23:30 bernie
- *#* Import drv/timer module.
- *#*
- *#*/
-
-#include "timer.h"
-#include <cpu.h>
-#include CPU_HEADER(timer)
-#include <debug.h>
-
-#if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS
- #include <kern/proc.h>
-#endif
-
-//! Master system clock (1ms accuracy)
-volatile time_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;
-
- DISABLE_IRQSAVE(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 *)timers_queue.head;
- while (node->link.succ)
- {
- /* Stop just after the insertion point */
- if (node->tick > timer->tick)
- break;
-
- /* Go to next node */
- node = (Timer *)node->link.succ;
- }
-
- /* Enqueue timer request into the list */
- INSERTBEFORE(&timer->link, &node->link);
-
- ENABLE_IRQRESTORE(flags);
-}
-
-
-/*!
- * Remove a timer from the timer queue before it has expired
- */
-Timer *timer_abort(Timer *timer)
-{
- cpuflags_t flags;
- DISABLE_IRQSAVE(flags);
- REMOVE(&timer->link);
- ENABLE_IRQRESTORE(flags);
-
- return timer;
-}
-
-#endif /* CONFIG_TIMER_DISABLE_EVENTS */
-
-
-/*!
- * Wait for the specified amount of time (expressed in ms)
- */
-void timer_delay(time_t time)
-{
-#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_set_delay(&t, time);
- timer_add(&t);
- sig_wait(SIG_SINGLE);
-
-#else /* !CONFIG_KERN_SIGNALS */
-
- time_t start = timer_ticks();
-
- /* Busy wait */
- while (timer_ticks() - start < time) { /* nop */ }
-
-#endif /* !CONFIG_KERN_SIGNALS */
-}
-
-
-#ifndef CONFIG_TIMER_DISABLE_UDELAY
-/*!
- * 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_udelay(utime_t usec_delay)
-{
- if (UNLIKELY(usec_delay > 1000))
- {
- timer_delay(usec_delay / 1000);
- usec_delay %= 1000;
- }
-
- // FIXME: This multiplication is too slow at run-time. We should try and move it
- // to compile-time by exposing the TIMER_HW_HPTICKS_PER_SEC in the header
- // file.
- hptime_t start = timer_hw_hpread();
- hptime_t delay = (uint32_t)usec_delay * TIMER_HW_HPTICKS_PER_SEC / 1000000ul;
-
- while (timer_hw_hpread() - start < 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
-
- TIMER_STROBE_ON;
-
- 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 *)timers_queue.head)->link.succ)
- {
- /* This request in list has not yet expired? */
- if (_clock < timer->tick)
- break;
-
- /* Retreat the expired timer */
- REMOVE(&timer->link);
-
- /* Execute the associated event */
- event_do(&timer->expire);
- }
-#endif /* CONFIG_TIMER_DISABLE_EVENTS */
-
- TIMER_STROBE_OFF;
-}
-
-
-/*!
- * Initialize timer
- */
-void timer_init(void)
-{
- TIMER_STROBE_INIT;
-
-#ifndef CONFIG_TIMER_DISABLE_EVENTS
- INITLIST(&timers_queue);
-#endif
-
- _clock = 0;
-
- timer_hw_init();
-}
projects / bertos.git / blobdiff