X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fau_sb.c;fp=src%2Fau_sb.c;h=f3184aeda46c1d0460006b9dfdd18febc5c67598;hb=bd35c984636a2d5dfdff7a80f8eaa4e388c6899c;hp=0000000000000000000000000000000000000000;hpb=9358438bef42dbbcd1492a52d9010899a9756d2c;p=bootcensus

diff --git a/src/au_sb.c b/src/au_sb.c
new file mode 100644
index 0000000..f3184ae
--- /dev/null
+++ b/src/au_sb.c
@@ -0,0 +1,164 @@
+/*
+pcboot - bootable PC demo/game kernel
+Copyright (C) 2018  John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY, without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+#include <stdio.h>
+#include "audio.h"
+#include "au_sb.h"
+#include "asmops.h"
+
+#define REG_MIXPORT		(base_port + 0x4)
+#define REG_MIXDATA		(base_port + 0x5)
+#define REG_RESET		(base_port + 0x6)
+#define REG_RDATA		(base_port + 0xa)
+#define REG_WDATA		(base_port + 0xc)
+#define REG_WSTAT		(base_port + 0xc)
+#define REG_RSTAT		(base_port + 0xe)
+#define REG_INTACK		(base_port + 0xe)
+#define REG_INT16ACK	(base_port + 0xf)
+
+#define WSTAT_BUSY		0x80
+#define RSTAT_RDY		0x80
+
+#define CMD_SET_RATE	0x41
+#define CMD_PLAY_PCM	0xa6
+#define CMD_STOP_PCM	0xd9
+#define CMD_GET_VER		0xe1
+
+#define VER_MAJOR(x)	((x) >> 8)
+#define VER_MINOR(x)	((x) & 0xff)
+
+static void write_dsp(unsigned char val);
+static unsigned char read_dsp(void);
+static int get_dsp_version(void);
+static const char *sbname(int ver);
+
+static int base_port;
+
+int sb_detect(void)
+{
+	int i, ver;
+
+	for(i=0; i<6; i++) {
+		base_port = 0x200 + ((i + 1) << 4);
+		if(sb_reset_dsp() == 0) {
+			ver = get_dsp_version();
+			printf("sb_detect: found %s (DSP v%d.%02d) at port %xh\n", sbname(ver),
+					VER_MAJOR(ver), VER_MINOR(ver), base_port);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+int sb_reset_dsp(void)
+{
+	int i;
+
+	outb(1, REG_RESET);
+	for(i=0; i<3; i++) iodelay();
+	outb(0, REG_RESET);
+
+	for(i=0; i<128; i++) {
+		if(inb(REG_RSTAT) & RSTAT_RDY) {
+			if(inb(REG_RDATA) == 0xaa) {
+				return 0;
+			}
+		}
+	}
+
+	return -1;
+}
+
+static void write_dsp(unsigned char val)
+{
+	while(inb(REG_WSTAT) & WSTAT_BUSY);
+	outb(val, REG_WDATA);
+}
+
+static unsigned char read_dsp(void)
+{
+	while((inb(REG_RSTAT) & RSTAT_RDY) == 0);
+	return inb(REG_RDATA);
+}
+
+static int get_dsp_version(void)
+{
+	int major, minor;
+
+	write_dsp(CMD_GET_VER);
+	major = read_dsp();
+	minor = read_dsp();
+
+	return (major << 8) | minor;
+}
+
+#define V(maj, min)	(((maj) << 8) | (min))
+
+static const char *sbname(int ver)
+{
+	int major = VER_MAJOR(ver);
+	int minor = VER_MINOR(ver);
+
+	switch(major) {
+	case 1:
+		if(minor == 5) {
+			return "Sound Blaster 1.5";
+		}
+		return "Sound Blaster 1.0";
+
+	case 2:
+		if(minor == 1 || minor == 2) {
+			return "Sound Blaster 2.0";
+		}
+		break;
+
+	case 3:
+		switch(minor) {
+		case 0:
+			return "Sound Blaster Pro";
+		case 1:
+		case 2:
+			return "Sound Blaster Pro 2";
+		case 5:
+			return "Gallant SC-6000";
+		default:
+			break;
+		}
+		break;
+
+	case 4:
+		switch(minor) {
+		case 4:
+		case 5:
+			return "Sound Blaster 16";
+		case 11:
+			return "Sound Blaster 16 SCSI-2";
+		case 12:
+			return "Sound Blaster AWE 32";
+		case 13:
+			return "Sound Blaster ViBRA16C";
+		case 16:
+			return "Sound Blaster AWE 64";
+		default:
+			break;
+		}
+		break;
+	}
+
+	return "Unknown Sound Blaster";
+}