alarm.c File Reference

#include "tamtypes.h"
#include "timer.h"
#include "ee_regs.h"
#include "kernel.h"
#include "internal.h"

Include dependency graph for alarm.c:

Go to the source code of this file.

Data Structures
struct	alarm

Macros
#define	USER_MODE_DISPATCHER   0x00082000
#define	INTC_TIM3   12
#define	T3_COUNT_W   ((vu32*)0xB0001800)
#define	T3_MODE_W   ((vu32*)0xB0001810)
#define	T3_COMP_W   ((vu32*)0xB0001820)

Functions
static u32	CalculateTimeDiff (u32 t1, u32 t2)
static int	InsertAlarm (u32 now, u32 target)
static s32	SetAlarmInternal (u16 time, void(*callback)(s32 dispatch_id, u16 time, void *common), void *common)
static void	SetupTIM3 (u16 ticks)
s32	ReleaseAlarm (s32 id)
s32	SetAlarm (u16 time, void(*callback)(s32 dispatch_id, u16 time, void *common), void *common)
void	Intc12Handler (void)

Variables
static int	AlarmCount = 0
static u64	AlarmStatus = 0
static struct alarm	alarms [MAX_ALARMS]

Macro Definition Documentation

INTC_TIM3

#define INTC_TIM3   12

Definition at line 19 of file alarm.c.

T3_COMP_W

#define T3_COMP_W   ((vu32*)0xB0001820)

Definition at line 22 of file alarm.c.

T3_COUNT_W

#define T3_COUNT_W   ((vu32*)0xB0001800)

Definition at line 20 of file alarm.c.

T3_MODE_W

#define T3_MODE_W   ((vu32*)0xB0001810)

Definition at line 21 of file alarm.c.

USER_MODE_DISPATCHER

#define USER_MODE_DISPATCHER   0x00082000

Definition at line 17 of file alarm.c.

Function Documentation

CalculateTimeDiff()

static u32 CalculateTimeDiff ( u32  t1, u32  t2  )

static

Definition at line 44 of file alarm.c.

{
        return(t2 < t1 ? (0x10000 | t2) : t2);
}

Referenced by InsertAlarm(), and ReleaseAlarm().

InsertAlarm()

static int InsertAlarm ( u32  now, u32  target  )

static

Definition at line 49 of file alarm.c.

{
        int pos, i;
 
        pos = 0;
        for(pos = 0; pos < AlarmCount; pos++)
        {
                if(target < CalculateTimeDiff(now, alarms[pos].time))
                {       //Spot found. If it is not at the end of the list, move back the list.
                        for(i = AlarmCount - 1; i >= pos; i--)
                                alarms[i+1] = alarms[i];
 
                        break;
                }
        }
 
        return pos;
}

References AlarmCount, alarms, CalculateTimeDiff(), pos, alarm::target, and time.

Referenced by SetAlarmInternal().

Intc12Handler()

void Intc12Handler

(

void

)

Definition at line 167 of file alarm.c.

{
        struct alarm alarm;
        void *gp;
        int i;
 
        for(i = 0; i < AlarmCount; i++)
        {       //Attempt to find another alarm request that has a different target. Update TIM3's comparator.
                if(alarms[i].target != alarms[0].target)
                {
                        SetupTIM3(alarms[i].target);
                        break;
                }
        }
 
        do{
                alarm = alarms[0];
                AlarmCount--;
                for(i = 0; i < AlarmCount; i++)
                        alarms[i] = alarms[i+1];
 
                gp = ChangeGP(alarm.gp);
                AlarmStatus &= ~(1 << alarm.id);
                InvokeUserModeCallback((void*)USER_MODE_DISPATCHER, alarm.callback, alarm.id, alarm.target, alarm.common);
                SetGP(gp);
 
                if(AlarmCount <= 0)
                        break;
        }while(alarms[0].target == alarm.target);
 
        if(AlarmCount <= 0)     //If there are no further alarms, disable CMPE.
                *T3_MODE_W = Tn_MODE(3,0,0,0,0,1,0,0,1,0);
        else
                SetupTIM3(alarms[0].target);
 
        ExitHandler();
}

References AlarmCount, alarms, AlarmStatus, alarm::callback, ChangeGP(), alarm::common, ExitHandler, gp, alarm::gp, alarm::id, InvokeUserModeCallback(), SetGP(), SetupTIM3(), T3_MODE_W, alarm::target, Tn_MODE, and USER_MODE_DISPATCHER.

ReleaseAlarm()

s32 ReleaseAlarm

(

s32

id

)

Definition at line 110 of file alarm.c.

{
        u16 time;
        s32 result;
        int i, j;
 
        result = -1;
        for(i = 0; i < AlarmCount; i++)
        {
                if(alarms[i].id == id)
                {
                        if(alarms[i].target == *T3_COMP_W)
                        {
                                if(*R_EE_I_STAT & (1 << INTC_TIM3))     //Cannot release alarm that has already triggered.
                                        return -1;
                        }
 
                        time = alarms[i].time;
                        //Move forward list.
                        for(j = i; j < AlarmCount - 1; j++)
                                alarms[j] = alarms[j+1];
 
                        --AlarmCount;
                        AlarmStatus &= ~(1 << id);
 
                        if(i == 0)      //If the first alarm was released, update timer comparator.
                                SetupTIM3(alarms[0].target);
 
                        if(AlarmCount == 0)     //Stop timer if there are no alarms left.
                                *T3_MODE_W = Tn_MODE(3,0,0,0,0,1,0,0,0,0);
 
                        result = (CalculateTimeDiff(time, *T3_COUNT_W) - time);
                }
        }
 
        EE_SYNC();
        return result;
}

References AlarmCount, alarms, AlarmStatus, CalculateTimeDiff(), EE_SYNC, alarm::id, INTC_TIM3, R_EE_I_STAT, result, SetupTIM3(), T3_COMP_W, T3_COUNT_W, T3_MODE_W, alarm::target, alarm::time, time, and Tn_MODE.

Referenced by WaitSemaTimeout().

SetAlarm()

s32 SetAlarm	(	u16	time,
		void(*)(s32 dispatch_id, u16 time, void *common)	callback,
		void *	common
	)

Definition at line 149 of file alarm.c.

{
        s32 result;
 
        result = SetAlarmInternal(time, callback, common);
        EE_SYNC();
 
        return result;
}

References alarm::callback, alarm::common, EE_SYNC, result, SetAlarmInternal(), and time.

SetAlarmInternal()

static s32 SetAlarmInternal ( u16  time, void(*)(s32 dispatch_id, u16 time, void *common)  callback, void *  common  )

static

Definition at line 68 of file alarm.c.

{
        void *gp;
        u32 target, now;
        struct alarm *alarm;
        int i, alarmID, pos;
 
        now = *T3_COUNT_W;
        target = now + time;
 
        if(AlarmCount >= MAX_ALARMS)
                return -1;
 
        alarmID = -1;
        for(i = 0; i < MAX_ALARMS; i++)
        {
                if(((AlarmStatus >> i) & 1) == 0)
                {
                        AlarmStatus |= (1 << i);
                        alarmID = i;
                        break;
                }
        }
 
        if(alarmID < 0)
                return alarmID;
 
        gp = GetGP();
        pos = InsertAlarm(now, target);
        alarm = &alarms[pos];
        alarm->time = time;
        alarm->target = (u16)target;
        alarm->id = alarmID;
        alarm->gp = gp;
        alarm->callback = callback;
        alarm->common = common;
        AlarmCount++;
        SetupTIM3(alarms[0].target);
 
        return alarm->id;
}

References AlarmCount, alarms, AlarmStatus, alarm::callback, alarm::common, GetGP(), gp, alarm::gp, alarm::id, InsertAlarm(), MAX_ALARMS, pos, SetupTIM3(), T3_COUNT_W, alarm::target, alarm::time, and time.

Referenced by SetAlarm().

SetupTIM3()

static void SetupTIM3 ( u16  ticks )

static

Definition at line 159 of file alarm.c.

{
        *T3_COMP_W = ticks;
        EE_SYNC();
        *T3_MODE_W = Tn_MODE(3,0,0,0,0,1,1,0,1,0);
}

References EE_SYNC, T3_COMP_W, T3_MODE_W, and Tn_MODE.

Referenced by Intc12Handler(), ReleaseAlarm(), and SetAlarmInternal().

Variable Documentation

AlarmCount

int AlarmCount = 0

static

Definition at line 24 of file alarm.c.

Referenced by InsertAlarm(), Intc12Handler(), ReleaseAlarm(), and SetAlarmInternal().

alarms

struct alarm alarms[MAX_ALARMS]

static

Definition at line 25 of file alarm.c.

Referenced by InsertAlarm(), Intc12Handler(), ReleaseAlarm(), and SetAlarmInternal().

AlarmStatus

u64 AlarmStatus = 0

static

Definition at line 25 of file alarm.c.

Referenced by Intc12Handler(), ReleaseAlarm(), and SetAlarmInternal().