/*!
* \file
* <!--
- * Copyright 2003,2004 Develer S.r.l. (http://www.develer.com/)
+ * 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 $Id$
+ * \brief Hardware independent timer driver (implementation)
*
+ * \version $Id$
* \author Bernardo Innocenti <bernie@develer.com>
- *
- * \brief Hardware independent timer driver (implementation)
*/
-/*
- * $Log$
- * 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.
- *
- */
+/*#*
+ *#* $Log$
+ *#* 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.
+ *#*
+ *#* Revision 1.19 2004/10/19 08:56:49 bernie
+ *#* TIMER_STROBE_ON, TIMER_STROBE_OFF, TIMER_STROBE_INIT: Move from timer_avr.h to timer.h, where they really belong.
+ *#*
+ *#* Revision 1.18 2004/10/14 23:14:05 bernie
+ *#* Fix longstanding problem with wrap-arounds.
+ *#*
+ *#* Revision 1.17 2004/10/03 18:52:08 bernie
+ *#* Move \brief on top in header to please Doxygen.
+ *#*
+ *#* Revision 1.16 2004/10/03 18:48:01 bernie
+ *#* timer_delay(): Add a sanity check to avoid sleeping forever.
+ *#*
+ *#* 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 "hw.h"
-#include "kdebug.h"
#include "timer.h"
+#include <cpu.h>
+#include <hw.h>
+#include CPU_HEADER(timer)
+#include <debug.h>
+#include <config.h>
-#ifdef CONFIG_KERN_SIGNALS
-#include <kern/proc.h>
+/*
+ * 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 (ARCH & ARCH_EMUL)
- #error To be recoded
-#elif defined(__AVR__)
- #include "timer_avr.h"
-#elif defined(__IAR_SYSTEMS_ICC) || defined(__IAR_SYSTEMS_ICC__) /* 80C196 */
- #include "timer_i196.h"
-#elif defined (__m56800__)
- #include "timer_dsp56k.h"
-#else
- #error Unknown system
+#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
-/*! Number of available timers */
-#define MAX_TIMERS 4
-
-
-//! Master system clock (1ms accuracy)
-volatile time_t _clock;
-
-static Timer soft_timers[MAX_TIMERS]; /*!< Pool of Timer structures */
-static List timers_pool; /*!< Pool of free timers */
-REGISTER static List timers_queue; /*!< Active timers */
+#if CONFIG_KERNEL && CONFIG_KERN_SIGNALS
+ #include <kern/proc.h>
+#endif
/*!
- * Return a new timer picking and removing it from the available
- * timers pool. Return NULL if no more timers are available.
+ * \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.
*/
-Timer *timer_new(void)
-{
- Timer *timer;
- cpuflags_t flags;
-
- DISABLE_IRQSAVE(flags);
-
- /* Should never happen */
- if (ISLISTEMPTY(&timers_pool))
- {
- ENABLE_IRQRESTORE(flags);
- DB(kprintf("Tmrspool empty\n");)
- return NULL;
- }
+#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
- /* Get a timer from the free pool */
- timer = (Timer *)timers_pool.head;
- REMOVE((Node *)timer);
- ENABLE_IRQRESTORE(flags);
+//! Master system clock (1ms accuracy)
+volatile time_t _clock;
- return timer;
-}
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
/*!
- * Delete a timer, putting it in the available timers queue.
+ * List of active asynchronous timers.
*/
-void timer_delete(Timer *timer)
-{
- cpuflags_t flags;
- DISABLE_IRQSAVE(flags);
- ADDHEAD(&timers_pool, &timer->link);
- ENABLE_IRQRESTORE(flags);
-}
+REGISTER static List timers_queue;
/*!
/* Calculate expiration time for this timer */
timer->tick = _clock + timer->delay;
- /* Search for the first node whose expiration time is
+ /*
+ * 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 insert point */
- if (node->tick > timer->tick)
+ /*
+ * 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 */
}
/* Enqueue timer request into the list */
- INSERTBEFORE((Node *)timer, (Node *)node);
+ INSERTBEFORE(&timer->link, &node->link);
ENABLE_IRQRESTORE(flags);
}
{
cpuflags_t flags;
DISABLE_IRQSAVE(flags);
- REMOVE((Node *)timer);
+ 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(IRQ_GETSTATE)
+ /* We shouldn't sleep with interrupts disabled */
+ ASSERT(IRQ_GETSTATE());
+#endif
+
#if defined(CONFIG_KERN_SIGNALS) && CONFIG_KERN_SIGNALS
Timer t;
#else /* !CONFIG_KERN_SIGNALS */
- time_t start = timer_gettick();
+ time_t start = timer_ticks();
/* Busy wait */
- while (timer_gettick() - start < time) { /* nop */ }
+ while (timer_ticks() - start < time)
+ {
+#if CONFIG_WATCHDOG
+ wdt_reset();
+#endif
+ }
#endif /* !CONFIG_KERN_SIGNALS */
}
+#ifndef CONFIG_TIMER_DISABLE_UDELAY
/*!
* Wait for the specified amount of time (expressed in microseconds)
*
*/
void timer_udelay(utime_t usec_delay)
{
- if (usec_delay > 1000)
+ if (UNLIKELY(usec_delay > 1000))
{
timer_delay(usec_delay / 1000);
usec_delay %= 1000;
while (timer_hw_hpread() - start < delay)
{}
}
+#endif /* CONFIG_TIMER_DISABLE_UDELAY */
/*!
*/
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. */
+ /*
+ * 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;
/* 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
break;
/* Retreat the expired timer */
- REMOVE((Node *)timer);
+ REMOVE(&timer->link);
/* Execute the associated event */
- event_doIntr(&timer->expire);
+ event_do(&timer->expire);
}
+#endif /* CONFIG_TIMER_DISABLE_EVENTS */
TIMER_STROBE_OFF;
}
*/
void timer_init(void)
{
- int i;
-
TIMER_STROBE_INIT;
- INITLIST(&timers_queue);
- INITLIST(&timers_pool);
-
- /* Init all software timers in the free pool */
- for (i = 0; i < MAX_TIMERS; i++)
- ADDTAIL(&timers_pool, (Node *)&soft_timers[i]);
+#ifndef CONFIG_TIMER_DISABLE_EVENTS
+ LIST_INIT(&timers_queue);
+#endif
_clock = 0;
timer_hw_init();
}
-
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