[PATCH 16/30] q800: add Apple Sound Chip (ASC) audio to machine

[Mark Cave-Ayland]

The Quadra 800 has the enhanced ASC (EASC) audio chip which supports both the
legacy IRQ routing through VIA2 and also "A/UX" mode routing direct to the
CPU.

Co-developed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/m68k/q800.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c
index d12aeaa20e..ed862f9e9d 100644
--- a/hw/m68k/q800.c
+++ b/hw/m68k/q800.c
@@ -43,6 +43,7 @@
 #include "hw/misc/djmemc.h"
 #include "hw/misc/iosb.h"
 #include "hw/input/adb.h"
+#include "hw/audio/asc.h"
 #include "hw/nubus/mac-nubus-bridge.h"
 #include "hw/display/macfb.h"
 #include "hw/block/swim.h"
@@ -115,7 +116,7 @@ struct GLUEState {
     M68kCPU *cpu;
     uint8_t ipr;
     uint8_t auxmode;
-    qemu_irq irqs[1];
+    qemu_irq irqs[2];
     QEMUTimer *nmi_release;
 };
 
@@ -124,8 +125,10 @@ struct GLUEState {
 #define GLUE_IRQ_IN_SONIC      2
 #define GLUE_IRQ_IN_ESCC       3
 #define GLUE_IRQ_IN_NMI        4
+#define GLUE_IRQ_IN_ASC        5
 
 #define GLUE_IRQ_NUBUS_9       0
+#define GLUE_IRQ_ASC           1
 
 /*
  * The GLUE logic on the Quadra 800 supports 2 different IRQ routing modes
@@ -187,6 +190,11 @@ static void GLUE_set_irq(void *opaque, int irq, int level)
             irq = 6;
             break;
 
+        case GLUE_IRQ_IN_ASC:
+            /* Route to VIA2 instead, negative edge-triggered */
+            qemu_set_irq(s->irqs[GLUE_IRQ_ASC], !level);
+            return;
+
         default:
             g_assert_not_reached();
         }
@@ -213,6 +221,10 @@ static void GLUE_set_irq(void *opaque, int irq, int level)
             irq = 6;
             break;
 
+        case GLUE_IRQ_IN_ASC:
+            irq = 4;
+            break;
+
         default:
             g_assert_not_reached();
         }
@@ -304,7 +316,7 @@ static void glue_init(Object *obj)
     qdev_init_gpio_in(dev, GLUE_set_irq, 8);
     qdev_init_gpio_in_named(dev, glue_auxmode_set_irq, "auxmode", 1);
 
-    qdev_init_gpio_out(dev, s->irqs, 1);
+    qdev_init_gpio_out(dev, s->irqs, 2);
 
     /* NMI release timer */
     s->nmi_release = timer_new_ms(QEMU_CLOCK_VIRTUAL, glue_nmi_release, s);
@@ -695,6 +707,20 @@ static void q800_machine_init(MachineState *machine)
 
     scsi_bus_legacy_handle_cmdline(&esp->bus);
 
+    /* Apple Sound Chip */
+
+    dev = qdev_new(TYPE_ASC);
+    qdev_prop_set_uint8(dev, "asctype", ASC_TYPE_EASC);
+    sysbus = SYS_BUS_DEVICE(dev);
+    sysbus_realize_and_unref(sysbus, &error_fatal);
+    memory_region_add_subregion(&m->macio, ASC_BASE - IO_BASE,
+                                sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 
0));
+    sysbus_connect_irq(sysbus, 0, qdev_get_gpio_in(m->glue, GLUE_IRQ_IN_ASC));
+
+    /* Wire ASC IRQ via GLUE for use in classic mode */
+    qdev_connect_gpio_out(m->glue, GLUE_IRQ_ASC,
+                          qdev_get_gpio_in(via2_dev, VIA2_IRQ_ASC_BIT));
+
     /* SWIM floppy controller */
 
     dev = qdev_new(TYPE_SWIM);
-- 
2.30.2