1 files changed, 37 insertions, 50 deletions

diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c
index 71b74c3372..525e38ce93 100644
--- a/hw/misc/mac_via.c
+++ b/hw/misc/mac_via.c
@@ -325,10 +325,11 @@ static void via1_sixty_hz(void *opaque)
 {
     MOS6522Q800VIA1State *v1s = opaque;
     MOS6522State *s = MOS6522(v1s);
-    MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
+    qemu_irq irq = qdev_get_gpio_in(DEVICE(s), VIA1_IRQ_60HZ_BIT);
 
-    s->ifr |= VIA1_IRQ_60HZ;
-    mdc->update_irq(s);
+    /* Negative edge trigger */
+    qemu_irq_lower(irq);
+    qemu_irq_raise(irq);
 
     via1_sixty_hz_update(v1s);
 }
@@ -337,44 +338,15 @@ static void via1_one_second(void *opaque)
 {
     MOS6522Q800VIA1State *v1s = opaque;
     MOS6522State *s = MOS6522(v1s);
-    MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
+    qemu_irq irq = qdev_get_gpio_in(DEVICE(s), VIA1_IRQ_ONE_SECOND_BIT);
 
-    s->ifr |= VIA1_IRQ_ONE_SECOND;
-    mdc->update_irq(s);
+    /* Negative edge trigger */
+    qemu_irq_lower(irq);
+    qemu_irq_raise(irq);
 
     via1_one_second_update(v1s);
 }
 
-static void via1_irq_request(void *opaque, int irq, int level)
-{
-    MOS6522Q800VIA1State *v1s = opaque;
-    MOS6522State *s = MOS6522(v1s);
-    MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
-
-    if (level) {
-        s->ifr |= 1 << irq;
-    } else {
-        s->ifr &= ~(1 << irq);
-    }
-
-    mdc->update_irq(s);
-}
-
-static void via2_irq_request(void *opaque, int irq, int level)
-{
-    MOS6522Q800VIA2State *v2s = opaque;
-    MOS6522State *s = MOS6522(v2s);
-    MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
-
-    if (level) {
-        s->ifr |= 1 << irq;
-    } else {
-        s->ifr &= ~(1 << irq);
-    }
-
-    mdc->update_irq(s);
-}
-
 
 static void pram_update(MOS6522Q800VIA1State *v1s)
 {
@@ -938,9 +910,26 @@ static uint64_t mos6522_q800_via2_read(void *opaque, hwaddr addr, unsigned size)
 {
     MOS6522Q800VIA2State *s = MOS6522_Q800_VIA2(opaque);
     MOS6522State *ms = MOS6522(s);
+    uint64_t val;
 
     addr = (addr >> 9) & 0xf;
-    return mos6522_read(ms, addr, size);
+    val = mos6522_read(ms, addr, size);
+
+    switch (addr) {
+    case VIA_REG_IFR:
+        /*
+         * On a Q800 an emulated VIA2 is integrated into the onboard logic. The
+         * expectation of most OSs is that the DRQ bit is live, rather than
+         * latched as it would be on a real VIA so do the same here.
+         *
+         * Note: DRQ is negative edge triggered
+         */
+        val &= ~VIA2_IRQ_SCSI_DATA;
+        val |= (~ms->last_irq_levels & VIA2_IRQ_SCSI_DATA);
+        break;
+    }
+
+    return val;
 }
 
 static void mos6522_q800_via2_write(void *opaque, hwaddr addr, uint64_t val,
@@ -1061,8 +1050,6 @@ static void mos6522_q800_via1_init(Object *obj)
     qbus_init((BusState *)&v1s->adb_bus, sizeof(v1s->adb_bus),
               TYPE_ADB_BUS, DEVICE(v1s), "adb.0");
 
-    qdev_init_gpio_in(DEVICE(obj), via1_irq_request, VIA1_IRQ_NB);
-
     /* A/UX mode */
     qdev_init_gpio_out(DEVICE(obj), &v1s->auxmode_irq, 1);
 }
@@ -1110,9 +1097,11 @@ static Property mos6522_q800_via1_properties[] = {
 static void mos6522_q800_via1_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
+    MOS6522DeviceClass *mdc = MOS6522_CLASS(oc);
 
     dc->realize = mos6522_q800_via1_realize;
-    dc->reset = mos6522_q800_via1_reset;
+    device_class_set_parent_reset(dc, mos6522_q800_via1_reset,
+                                  &mdc->parent_reset);
     dc->vmsd = &vmstate_q800_via1;
     device_class_set_props(dc, mos6522_q800_via1_properties);
 }
@@ -1150,22 +1139,21 @@ static void mos6522_q800_via2_reset(DeviceState *dev)
     ms->a = 0x7f;
 }
 
-static void via2_nubus_irq_request(void *opaque, int irq, int level)
+static void via2_nubus_irq_request(void *opaque, int n, int level)
 {
     MOS6522Q800VIA2State *v2s = opaque;
     MOS6522State *s = MOS6522(v2s);
-    MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
+    qemu_irq irq = qdev_get_gpio_in(DEVICE(s), VIA2_IRQ_NUBUS_BIT);
 
     if (level) {
         /* Port A nubus IRQ inputs are active LOW */
-        s->a &= ~(1 << irq);
-        s->ifr |= 1 << VIA2_IRQ_NUBUS_BIT;
+        s->a &= ~(1 << n);
     } else {
-        s->a |= (1 << irq);
-        s->ifr &= ~(1 << VIA2_IRQ_NUBUS_BIT);
+        s->a |= (1 << n);
     }
 
-    mdc->update_irq(s);
+    /* Negative edge trigger */
+    qemu_set_irq(irq, !level);
 }
 
 static void mos6522_q800_via2_init(Object *obj)
@@ -1177,8 +1165,6 @@ static void mos6522_q800_via2_init(Object *obj)
                           "via2", VIA_SIZE);
     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);
 }
@@ -1199,7 +1185,8 @@ static void mos6522_q800_via2_class_init(ObjectClass *oc, void *data)
     DeviceClass *dc = DEVICE_CLASS(oc);
     MOS6522DeviceClass *mdc = MOS6522_CLASS(oc);
 
-    dc->reset = mos6522_q800_via2_reset;
+    device_class_set_parent_reset(dc, mos6522_q800_via2_reset,
+                                  &mdc->parent_reset);
     dc->vmsd = &vmstate_q800_via2;
     mdc->portB_write = mos6522_q800_via2_portB_write;
 }