[PATCH 12/12] mac_via: add qdev gpios for nubus slot interrupts to VIA2

[Mark Cave-Ayland]

These will soon be required to enable nubus devices to support interrupts.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/misc/mac_via.c         | 23 +++++++++++++++++++++++
 include/hw/misc/mac_via.h | 10 ++++++++++
 2 files changed, 33 insertions(+)

diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c
index f093f7388e..d1abcd97b5 100644
--- a/hw/misc/mac_via.c
+++ b/hw/misc/mac_via.c
@@ -1123,6 +1123,26 @@ static void mos6522_q800_via2_reset(DeviceState *dev)
 
     ms->dirb = 0;
     ms->b = 0;
+    ms->dira = 0;
+    ms->a = 0x7f;
+}
+
+static void via2_nubus_irq_request(void *opaque, int irq, int level)
+{
+    MOS6522Q800VIA2State *v2s = opaque;
+    MOS6522State *s = MOS6522(v2s);
+    MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
+
+    if (level) {
+        /* Port A nubus IRQ inputs are active LOW */
+        s->a &= ~(1 << irq);
+        s->ifr |= 1 << VIA2_IRQ_NUBUS_BIT;
+    } else {
+        s->a |= (1 << irq);
+        s->ifr &= ~(1 << VIA2_IRQ_NUBUS_BIT);
+    }
+
+    mdc->update_irq(s);
 }
 
 static void mos6522_q800_via2_init(Object *obj)
@@ -1135,6 +1155,9 @@ static void mos6522_q800_via2_init(Object *obj)
     sysbus_init_mmio(sbd, &v2s->via_mem);
 
     qdev_init_gpio_in(DEVICE(obj), via2_irq_request, VIA2_IRQ_NB);
+
+    qdev_init_gpio_in_named(DEVICE(obj), via2_nubus_irq_request, "nubus-irq",
+                            VIA2_NUBUS_IRQ_NB);
 }
 
 static const VMStateDescription vmstate_q800_via2 = {
diff --git a/include/hw/misc/mac_via.h b/include/hw/misc/mac_via.h
index 5168e3ce66..4506abe5d0 100644
--- a/include/hw/misc/mac_via.h
+++ b/include/hw/misc/mac_via.h
@@ -93,6 +93,16 @@ struct MOS6522Q800VIA1State {
 #define VIA2_IRQ_SCSI           (1 << VIA2_IRQ_UNUSED_BIT)
 #define VIA2_IRQ_ASC            (1 << VIA2_IRQ_ASC_BIT)
 
+#define VIA2_NUBUS_IRQ_NB       7
+
+#define VIA2_NUBUS_IRQ_9        0
+#define VIA2_NUBUS_IRQ_A        1
+#define VIA2_NUBUS_IRQ_B        2
+#define VIA2_NUBUS_IRQ_C        3
+#define VIA2_NUBUS_IRQ_D        4
+#define VIA2_NUBUS_IRQ_E        5
+#define VIA2_NUBUS_IRQ_INTVIDEO 6
+
 #define TYPE_MOS6522_Q800_VIA2 "mos6522-q800-via2"
 OBJECT_DECLARE_SIMPLE_TYPE(MOS6522Q800VIA2State, MOS6522_Q800_VIA2)
 
-- 
2.20.1