Re: [9fans] sb16

["Russ Cox" <rsc@swtch.com>]

> So, I added the line
>         audio0=type=sb16 port=0x220 irq=5 dma=1
> to plan9.ini and 'bind #A' to termrc, but I got the error

If the driver says the card isn't responding, making it
continue on blindly isn't likely to change the situation.
Luckily, the card you have should work, as long as it 
is what Win98 says it is.

On the sb16 plug-and-play, the important field is port=.
The irq= and dma= actually get programmed into the
card (or read from it, if you don't specify them), but
the driver needs a correct port= to find the card in the
first place.

Below is a very old throwaway program I wrote called tsb.c.
I haven't used it in 7+ years, but it looks like it should
still work.  It probes a given port to see if it finds a sb16 there.
If it prints sensible numbers, then it did.

	8c tsb.c
	8l tsb.8
	for(i in 0x220 0x240 0x260 0x280)
		echo -n 'port='$i && 8.out $i >[2]/dev/null

For example, here's a run on a machine without a sb16.

	% for(i in 0x220 0x240 0x260 0x280)
		echo -n 'port='$i && 8.out >[2]/dev/null
	port=0x220 irq:#ff:10 dma:#ff:0 1 3 5 6 7 
	port=0x240 irq:#ff:10 dma:#ff:0 1 3 5 6 7 
	port=0x260 irq:#ff:10 dma:#ff:0 1 3 5 6 7 
	port=0x280 irq:#ff:10 dma:#ff:0 1 3 5 6 7 
	% 

On a machine with a sb16, one of those lines should have hex
numbers other than #ff.  Use that port number.

If you run it without the >[2]/dev/null you'll get more 
debugging info than you could want to see.

Russ


--- tsb.c
#include <u.h>
#include <libc.h>

int iobfd = -1;

uchar
inportb(long port)
{
	uchar data;
	if(iobfd == -1)
		iobfd = open("#P/iob", ORDWR);
	seek(iobfd, port, 0);
	if(read(iobfd, &data, sizeof(data)) != sizeof(data))
		fprint(2, "inportb(0x%4.4x): %r\n", port);
	return data;
}

void
outportb(long port, uchar b)
{
	if(iobfd == -1)
		iobfd = open("#P/iob", ORDWR);
	seek(iobfd, port, 0);
	if(write(iobfd, &b, sizeof(b)) != sizeof(b))
		fprint(2, "outportb(0x%4.4x, %#x): %r\n", port);
	
}
	
int mixaddr, mixdata, rstatus, bread, bwrite, wstatus, reset;

int sbread(void)
{	int i;
	int s;
	for(i=0;i<16;i++) {
		s=inportb(rstatus);
		fprint(2,"(rstat %#x)", s);
		if(s & 0x80) {
			return inportb(bread);
		}
	}
	return 0xbb;
}

int sbwrite(int d)
{
int i, s;
	for(i=0; i<16; i++) {
		s=inportb(rstatus);
		fprint(2,"(rstat %#x)", s);
		if((s & 0x80) == 0) {
			outportb(bwrite, d);
			return 0;
		}
	}
	return 1;
}
	
void
main(int argc, char **argv)
{
	int i, j, irq, dma;
	int base;

	base = argc > 1 ? atoi(argv[1]) : 0x220;
fprint(2, "base 0x%x\n", base);
	mixaddr = base + 4;
	mixdata = base + 5;
	reset = base + 6;
	wstatus = base + 0xc;
	bread = base  + 0xa;
	bwrite = base + 0xc;
	rstatus = base + 0xe;
	
	fprint(2, "testing...\n");
	fprint(2, "reset...");
	outportb(reset, 1);
	sleep(1);
	outportb(reset, 0);
	sleep(2);
	fprint(2, "read...");
	fprint(2, "%#x...", inportb(bread));
	fprint(2, "%#x...", inportb(bread));
	fprint(2, "%#x...", inportb(bread));
	fprint(2, "%#x...", inportb(bread));

	fprint(2, "write e1...");
	fprint(2, "%d...", sbwrite(0xe1));

	fprint(2, "read...");
	fprint(2, "%#x...", sbread());
	fprint(2, "read...");
	fprint(2, "%#x...", sbread());

	fprint(2, "0x80: ");
	outportb(mixaddr, 0x80);
	fprint(2, "%#2.2x...", i=inportb(mixdata));
	irq = 0;
	print(" irq:#%2.2x", i);
	if(i & 1) irq = 2;
	if(i & 2) irq = 5;
	if(i & 4) irq = 7;
	if(i & 8) irq = 10;
	print(":%d ", irq);

	fprint(2, "0x81: ");
	outportb(mixaddr, 0x81);
	fprint(2, "%#2.2x...", i=inportb(mixdata));
	dma = 0;
	print("dma:#%2.2x:", i);
	for(j=0; j<8; j++) {
		if(i & (1 << j) && j != 2 && j != 4) {
			print("%d ", j);
			dma = j;
		}
	}

	fprint(2, "0x82: ");
	outportb(mixaddr, 0x82);
	fprint(2, "%#2.2x...", inportb(mixdata));

	fprint(2, "\n");
	print("\n");	
}