Intel AC97

(Currently not functional)

src/include/86box/snd_ac97_intel.h

@@ -0,0 +1,54 @@
+/*
+ * Intel AC'97 Header
+ *
+ * Authors:	Tiseno100,
+ *
+ * Copyright 2022 Tiseno100.
+ */
+
+
+/*
+ * Note: The Intel AC'97 code is divided into three parts
+ *
+ * 1. intel_ac97.c The main AC'97 code handling configuration.
+ * 3. intel_ac97_buffer.c The AC'97 buffer
+ * 
+ * 
+ * The general AC'97 configures the buffer base address and capabilities like channels, reset, interrupts etc.
+ * The AC'97 buffer is where all playback happens.
+*/
+
+#ifndef EMU_INTEL_AC97_H
+# define EMU_INTEL_AC97_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <86box/mem.h>
+#include <86box/snd_ac97.h>
+
+typedef struct intel_ac97_t
+{
+    uint16_t ac97_base;
+    uint16_t mixer_base;
+    uint32_t buffer_base;
+
+    uint8_t regs[256];
+    int irq;
+
+    ac97_codec_t *mixer;
+    mem_mapping_t *buffer_location;
+} intel_ac97_t;
+
+/* AC'97 Configuration */
+extern void intel_ac97_base(int enable, uint16_t addr, intel_ac97_t *dev);
+extern void intel_ac97_mixer_base(int enable, uint16_t addr, intel_ac97_t *dev);
+extern void intel_ac97_set_irq(int irq, intel_ac97_t *dev);
+
+extern const device_t   intel_ac97_device;
+extern const device_t   intel_ac97_mixer_device;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/*EMU_INTEL_AC97_H*/

src/sound/CMakeLists.txt

@@ -14,7 +14,7 @@
 #
 
 add_library(snd OBJECT sound.c snd_opl.c snd_opl_nuked.c snd_opl_ymfm.cpp snd_resid.cc
-    midi.c snd_speaker.c snd_pssj.c snd_lpt_dac.c snd_ac97_codec.c snd_ac97_via.c
+    midi.c snd_speaker.c snd_pssj.c snd_lpt_dac.c snd_ac97_codec.c snd_ac97_intel.c snd_ac97_via.c
     snd_lpt_dss.c snd_ps1.c snd_adlib.c snd_adlibgold.c snd_ad1848.c snd_audiopci.c
     snd_azt2316a.c snd_cms.c snd_cmi8x38.c snd_cs423x.c snd_gus.c snd_sb.c snd_sb_dsp.c
     snd_emu8k.c snd_mpu401.c snd_sn76489.c snd_ssi2001.c snd_wss.c snd_ym7128.c)

src/sound/snd_ac97_intel.c

@@ -0,0 +1,205 @@
+/*
+ * Intel AC'97
+ *
+ * Authors:	Tiseno100,
+ *
+ * Copyright 2022 Tiseno100.
+ */
+
+/*
+ * Buffers, AC-Link and other things require understanding.
+ * But I also need a functional board with AC'97 to continue.
+*/
+
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#define HAVE_STDARG_H
+#include <86box/86box.h>
+#include "cpu.h"
+#include <86box/timer.h>
+#include <86box/io.h>
+#include <86box/device.h>
+
+#include <86box/snd_ac97.h>
+#include <86box/snd_ac97_intel.h>
+
+#ifdef ENABLE_INTEL_AC97_LOG
+int intel_ac97_do_log = ENABLE_INTEL_AC97_LOG;
+static void
+intel_ac97_log(const char *fmt, ...)
+{
+    va_list ap;
+
+    if (intel_ac97_do_log) {
+	va_start(ap, fmt);
+	pclog_ex(fmt, ap);
+	va_end(ap);
+    }
+}
+#else
+#define intel_ac97_log(fmt, ...)
+#endif
+
+
+/* Mixer Configuration */
+static void
+intel_ac97_mixer_write(uint16_t addr, uint16_t val, void *priv)
+{
+    intel_ac97_t *dev = (intel_ac97_t *) priv;
+
+    addr -= dev->mixer_base;
+    ac97_codec_writew(dev->mixer, addr, val);
+}
+
+static uint16_t
+intel_ac97_mixer_read(uint16_t addr, void *priv)
+{
+    intel_ac97_t *dev = (intel_ac97_t *) priv;
+
+    addr -= dev->mixer_base;
+    return ac97_codec_readw(dev->mixer, addr);
+}
+
+void
+intel_ac97_mixer_base(int enable, uint16_t addr, intel_ac97_t *dev)
+{
+    if(dev->mixer_base != 0)
+        io_removehandler(dev->mixer_base, 256, NULL, intel_ac97_mixer_read, NULL, NULL, intel_ac97_mixer_write, NULL, dev);
+
+    intel_ac97_log("Intel AC'97 Mixer: Base has been set on 0x%x\n", addr);
+    dev->mixer_base = addr;
+
+    if((addr != 0) && enable)
+        io_sethandler(addr, 256, NULL, intel_ac97_mixer_read, NULL, NULL, intel_ac97_mixer_write, NULL, dev);
+}
+
+
+/* AC'97 Configuration */
+void
+intel_ac97_set_irq(int irq, intel_ac97_t *dev)
+{
+    intel_ac97_log("Intel AC'97: IRQ Base was set to %d\n");
+
+    dev->irq = irq;
+}
+
+static void
+intel_ac97_write(uint16_t addr, uint8_t val, void *priv)
+{
+    intel_ac97_t *dev = (intel_ac97_t *) priv;
+    addr -= dev->ac97_base;
+
+    intel_ac97_log("Intel AC'97: dev->regs[%02x] = %02x\n", addr, val);
+
+    switch(addr)
+    {
+        case 0x10 ... 0x13: /* Buffer BAR */
+            dev->regs[addr] = val;
+        break;
+
+        case 0x15: /* Last Valid Index */
+            dev->regs[addr] &= val;
+        break;
+
+        case 0x16: /* Status */
+            dev->regs[addr] &= val;
+        break;
+
+        case 0x1b: /* Control */
+            dev->regs[addr] = val & 0x1f;
+        break;
+
+        case 0x2c: /* Global Control */
+            dev->regs[addr] = val & 0x3f;
+        break;
+
+        case 0x2e: /* Global Control */
+            dev->regs[addr] = val & 0x30;
+        break;
+
+        case 0x34: /* Codec Access Semaphore */
+            dev->regs[addr] = val & 1;
+        break;
+    }
+}
+
+
+static uint8_t
+intel_ac97_read(uint16_t addr, void *priv)
+{
+    intel_ac97_t *dev = (intel_ac97_t *) priv;
+    addr -= dev->ac97_base;
+
+    if(addr < 0x40) {
+        intel_ac97_log("Intel AC'97: dev->regs[%02x] (%02x)\n", addr, dev->regs[addr]);
+        return dev->regs[addr];
+    }
+    else
+        return 0xff;
+}
+
+void
+intel_ac97_base(int enable, uint16_t addr, intel_ac97_t *dev)
+{
+    if(dev->ac97_base != 0)
+        io_removehandler(dev->ac97_base, 64, intel_ac97_read, NULL, NULL, intel_ac97_write, NULL, NULL, dev);
+
+    intel_ac97_log("Intel AC'97: Base has been set on 0x%x\n", addr);
+    dev->ac97_base = addr;
+
+    if((addr != 0) && enable)
+        io_sethandler(addr, 64, intel_ac97_read, NULL, NULL, intel_ac97_write, NULL, NULL, dev);
+
+}
+
+
+static void
+intel_ac97_reset(void *priv)
+{
+    intel_ac97_t *dev = (intel_ac97_t *) priv;
+    memset(dev->regs, 0, sizeof(dev->regs)); /* Wash out the registers */
+
+    // We got nothing here yet
+}
+
+
+static void
+intel_ac97_close(void *priv)
+{
+    intel_ac97_t *dev = (intel_ac97_t *) priv;
+
+    free(dev);
+}
+
+
+static void *
+intel_ac97_init(const device_t *info)
+{
+    intel_ac97_t *dev = (intel_ac97_t *) malloc(sizeof(intel_ac97_t));
+    memset(dev, 0, sizeof(intel_ac97_t));
+
+    intel_ac97_log("Intel AC'97: Started!\n");
+    // We got nothing here yet
+
+    dev->mixer = device_add(&ad1881_device); /* Add a mixer with no real functionality for now */
+
+    return dev;
+}
+
+const device_t intel_ac97_device = {
+    .name = "Intel AC'97 Version 2.1",
+    .internal_name = "intel_ac97",
+    .flags = 0,
+    .local = 0,
+    .init = intel_ac97_init,
+    .close = intel_ac97_close,
+    .reset = intel_ac97_reset,
+    { .available = NULL },
+    .speed_changed = NULL,
+    .force_redraw = NULL,
+    .config = NULL
+};

src/win/Makefile.mingw

@@ -690,7 +690,7 @@ SNDOBJ		:= sound.o \
 		    snd_ps1.o \
 		    snd_lpt_dac.o snd_lpt_dss.o \
 		    snd_adlib.o snd_adlibgold.o snd_ad1848.o snd_audiopci.o \
-		    snd_ac97_codec.o snd_ac97_via.o \
+		    snd_ac97_codec.o snd_ac97_intel.o snd_ac97_via.o \
 		    snd_azt2316a.o snd_cs423x.o snd_cmi8x38.o \
 		    snd_cms.o \
 		    snd_gus.o \