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/*
* Mac bong noise generator. Note - we ought to put a boingy noise
* here 8)
*/
#include <linux/sched.h>
#include <linux/timer.h>
#include <asm/macintosh.h>
#include <asm/mac_asc.h>
static const signed char sine_data[] = {
0, 39, 75, 103, 121, 127, 121, 103, 75, 39,
0, -39, -75, -103, -121, -127, -121, -103, -75, -39
};
#define DATA_SIZE (sizeof(sine_data)/sizeof(sine_data[0]))
static void nosound( unsigned long ignored );
static struct timer_list sound_timer = { NULL, NULL, 0, 0, nosound };
static volatile unsigned char *asc_base=(void *)0x50F14000;
void mac_mksound( unsigned int hz, unsigned int ticks )
{
static int inited = 0;
unsigned long flags;
int samples=512;
if(!inited)
{
int i=0;
int j=0;
int k=0;
int l=0;
for(i=0;i<samples;i++)
{
asc_base[i]=sine_data[j];
asc_base[i+512]=sine_data[j];
asc_base[i+1024]=sine_data[j];
asc_base[i+1536]=sine_data[j];
j++;
if(j==DATA_SIZE)
j=0;
if(i&1)
k++;
if(k==DATA_SIZE)
k=0;
if((i&3)==3)
l++;
if(l==DATA_SIZE)
l=0;
}
inited=1;
}
save_flags(flags);
cli();
del_timer( &sound_timer );
if (hz > 20 && hz < 32767) {
int i;
u_long asc_pulses=((hz<<5)*samples)/468;
for(i=0;i<4;i++)
{
asc_base[ASC_FREQ(i,0)]=0x00;
asc_base[ASC_FREQ(i,1)]=20;
asc_base[ASC_FREQ(i,2)]=0x00;
asc_base[ASC_FREQ(i,3)]=20;
asc_base[ASC_FREQ(i,4)]=(asc_pulses>>24)&0xFF;
asc_base[ASC_FREQ(i,5)]=(asc_pulses>>16)&0xFF;
asc_base[ASC_FREQ(i,6)]=(asc_pulses>>8)&0xFF;
asc_base[ASC_FREQ(i,7)]=(asc_pulses>>0)&0xFF;
}
asc_base[ASC_CHAN]=0x03;
asc_base[ASC_VOLUME]=128;
asc_base[ASC_MODE]=ASC_MODE_SAMPLE;
asc_base[ASC_ENABLE]=ASC_ENABLE_SAMPLE;
if (ticks) {
sound_timer.expires = jiffies + ticks;
add_timer( &sound_timer );
}
} else {
nosound( 0 );
}
restore_flags(flags);
}
static void nosound( unsigned long ignored )
{
asc_base[ASC_ENABLE]=0;
}
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