patch-2.1.87 linux/arch/m68k/mac/macboing.c

• Lines: 93
• Date: Thu Feb 12 16:30:13 1998
• Orig file: v2.1.86/linux/arch/m68k/mac/macboing.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.86/linux/arch/m68k/mac/macboing.c linux/arch/m68k/mac/macboing.c
@@ -0,0 +1,92 @@
+/*
+ *	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;
+}