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#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
enum {
Ntimer = 4 /* maximum allowed by hardware */
};
static struct {
Lock;
int init;
int ntimer; /* actual timers on this chip revision */
GTimer t[Ntimer];
} cpmtimers;
static uchar timerirq[] = {0x19, 0x12, 0x0C, 0x07};
static void gtimerinit(int, ushort*, ushort*);
static void
gtimerreset(void)
{
IMM *io;
int i;
ilock(&cpmtimers);
if(!cpmtimers.init){
if(m->cputype == 0x50 && (getimmr() & 0xFFFF) <= 0x2001)
cpmtimers.ntimer = 2;
else
cpmtimers.ntimer = Ntimer;
io = m->iomem;
io->tgcr = 0x2222; /* reset timers, low-power stop */
for(i=0; i<cpmtimers.ntimer; i++)
gtimerinit(i, &io->tmr1+i, &io->ter1+i);
cpmtimers.init = 1;
}
iunlock(&cpmtimers);
}
static void
gtimerintr(Ureg *ur, void *arg)
{
GTimer *t;
t = arg;
t->event = *t->ter;
*t->ter = t->event;
if(t->inuse && t->interrupt != nil)
t->interrupt(ur, t->arg, t);
}
static void
gtimerinit(int i, ushort *tmr, ushort *ter)
{
GTimer *t;
char name[KNAMELEN];
snprint(name, sizeof(name), "timer.%d", i);
t = &cpmtimers.t[i];
t->x = i*4; /* field in tgcr */
t->inuse = 0;
t->interrupt = nil;
t->tmr = tmr;
t->trr = tmr+2;
t->tcr = tmr+4;
t->tcn = tmr+6;
t->ter = ter;
intrenable(VectorCPIC+timerirq[i], gtimerintr, t, BUSUNKNOWN, name);
}
GTimer*
gtimer(ushort mode, ushort ref, void (*intr)(Ureg*,void*,GTimer*), void *arg)
{
GTimer *t;
int i;
t = cpmtimers.t;
if(!cpmtimers.init)
gtimerreset();
ilock(&cpmtimers);
for(i=0; ; i++){
if(i >= cpmtimers.ntimer){
iunlock(&cpmtimers);
return nil;
}
if(t->inuse == 0)
break;
t++;
}
t->inuse = 1;
t->interrupt = intr;
t->arg = arg;
m->iomem->tgcr &= ~(0xF<<t->x); /* reset */
*t->tmr = mode;
*t->tcn = 0;
*t->trr = ref;
*t->ter = 0xFFFF;
iunlock(&cpmtimers);
return t;
}
void
gtimerset(GTimer *t, ushort mode, int usec)
{
ulong ref, ps;
int clk;
if(usec <= 0)
return;
ref = usec*m->speed;
clk = mode & (3<<1);
if(ref >= 0x1000000 && clk == TimerSclk){
mode = (mode & ~clk) | TimerSclk16;
ref >>= 4;
} else if(clk == TimerSclk16)
ref >>= 4;
ps = (ref+(1<<16))/(1<<16); /* round up */
ref /= ps;
*t->tmr = ((ps-1)<<8) | (mode&0xFF);
*t->trr = ref;
}
void
gtimerstart(GTimer *t)
{
if(t){
ilock(&cpmtimers);
m->iomem->tgcr = (m->iomem->tgcr & ~(0xF<<t->x)) | (1<<t->x); /* enable */
iunlock(&cpmtimers);
}
}
void
gtimerstop(GTimer *t)
{
if(t){
ilock(&cpmtimers);
m->iomem->tgcr |= 2<<t->x; /* stop */
iunlock(&cpmtimers);
}
}
void
gtimerfree(GTimer *t)
{
if(t){
ilock(&cpmtimers);
t->inuse = 0;
*t->tmr = 0; /* disable interrupts */
*t->ter = 0xFFFF;
m->iomem->tgcr = (m->iomem->tgcr & ~(0xF<<t->x)) | (2<<t->x); /* reset and stop */
iunlock(&cpmtimers);
}
}
#ifdef GTIMETEST
static void
gtintr(Ureg*, void*, GTimer*)
{
m->bcsr[4] ^= DisableVideoLamp; /* toggle an LED */
}
void
gtimetest(void)
{
GTimer *g;
g = gtimer(0, 0, gtintr, nil);
gtimerset(g, TimerORI|TimerRestart|TimerSclk, 64000);
gtimerstart(g);
delay(1);
print("started timer: #%4.4ux #%4.4ux %8.8lux #%4.4ux #%4.4ux\n", *g->tmr, *g->trr, m->iomem->tgcr, *g->tcn, *g->ter);
print("ter=#%8.8lux tmr=#%8.8lux trr=#%8.8lux\n", g->ter, g->tmr, g->trr);
}
#endif
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