timerd.h

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/* -*-C-*-
 *
 * $Revision: 1.2 $
 *   $Author: rivimey $
 *     $Date: 1999/03/22 12:50:56 $
 *
 * Copyright (c) 1996 Advanced RISC Machines Limited.
 * All Rights Reserved.
 *
 *   Project: ANGEL
 *
 *     Title: Angel Timer driver interface
 *
 */
#ifndef angel_timerd_h
#define angel_timerd_h


#ifndef TIMER_SUPPORTED
#define TIMER_SUPPORTED 0
#endif

#if TIMER_SUPPORTED

#ifndef MAX_TIMERS 
#define MAX_TIMERS 4
#endif

/* number of milliseconds between basic clock ticks */
#define CLK_TCK       5

/* flags for TimerList.flags */
#define TF_ALLOC      0x1
#define TF_RELOAD     0x2
#define TF_SIGNALME   0x4
typedef void (*TimerCallback)(int, unsigned);

struct TimerDev
{
    void (*timer_init)(void);     /* initialise timer */
    void (*timer_start)(void);    /* set timer running, interval set by set_interval */
    void (*timer_stop)(void);     /* stop timer running */

    int  (*timer_critical)(void); /* enter critical section (stop timer interrupts) */
    void (*timer_normal)(int);    /* leave critical section (restart timer interrupts) */
    
    void (*timer_set_interval)(long); /* set interval, in microseconds, only when stopped */
    long (*timer_get_interval)(void); /* get interval, in microseconds */
};

void Timer_Tick(unsigned empty_stack);
void Timer_Initialise(void);
int Timer_NewTimer(long interval, int flags,
                   TimerCallback fn, int data);
void Timer_DeleteTimer(int timer);
unsigned long Timer_CurrentTime(void);
void Timer_Delay(unsigned long delay);
extern const struct TimerDev Angel_TimerDev;

#endif /* TIMER_SUPPORTED */

#endif /* angel_timerd_h */

/* EOF timer.h */