[PATCH 2/5] hw/isa/vt82c686: Implement PIRQ pins

[BALATON Zoltan]

The chip has 4 pins (called PIRQA-D in VT82C686B and PINTA-D in
VT8231) that are meant to be connected to PCI IRQ lines and allow
routing PCI interrupts to the ISA PIC. Add gpio inputs to model these.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 hw/isa/vt82c686.c         | 18 ++++++++++++++++++
 include/hw/isa/vt82c686.h |  4 ++++
 2 files changed, 22 insertions(+)

diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 1972063903..f31b2fa7ca 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -613,6 +613,18 @@ void via_isa_set_irq(PCIDevice *d, ViaISAIRQSourceBit n, 
int level)
         max_irq = 14;
         isa_irq = d->config[PCI_INTERRUPT_LINE];
         break;
+    case VIA_IRQ_PIRQA:
+        isa_irq = d->config[0x55] >> 4;
+        break;
+    case VIA_IRQ_PIRQB:
+        isa_irq = d->config[0x56] & 0xf;
+        break;
+    case VIA_IRQ_PIRQC:
+        isa_irq = d->config[0x56] >> 4;
+        break;
+    case VIA_IRQ_PIRQD:
+        isa_irq = d->config[0x57] >> 4;
+        break;
     }
 
     if (unlikely(isa_irq > max_irq || isa_irq == 2)) {
@@ -632,6 +644,11 @@ void via_isa_set_irq(PCIDevice *d, ViaISAIRQSourceBit n, 
int level)
     qemu_set_irq(s->isa_irqs[isa_irq], !!s->isa_irq_state[isa_irq]);
 }
 
+static void via_isa_pirq(void *opaque, int n, int level)
+{
+    via_isa_set_irq(opaque, VIA_IRQ_PIRQA + n, level);
+}
+
 static void via_isa_request_i8259_irq(void *opaque, int irq, int level)
 {
     ViaISAState *s = opaque;
@@ -648,6 +665,7 @@ static void via_isa_realize(PCIDevice *d, Error **errp)
     int i;
 
     qdev_init_gpio_out(dev, &s->cpu_intr, 1);
+    qdev_init_gpio_in_named(dev, via_isa_pirq, "pirq", PCI_NUM_PINS);
     isa_irq = qemu_allocate_irqs(via_isa_request_i8259_irq, s, 1);
     isa_bus = isa_bus_new(dev, pci_address_space(d), pci_address_space_io(d),
                           errp);
diff --git a/include/hw/isa/vt82c686.h b/include/hw/isa/vt82c686.h
index a0f9f80401..e982c5fe26 100644
--- a/include/hw/isa/vt82c686.h
+++ b/include/hw/isa/vt82c686.h
@@ -14,6 +14,10 @@ typedef enum {
     VIA_IRQ_IDE1 = 1,
     VIA_IRQ_USB0 = 2,
     VIA_IRQ_USB1 = 3,
+    VIA_IRQ_PIRQA = 4,
+    VIA_IRQ_PIRQB = 5,
+    VIA_IRQ_PIRQC = 6,
+    VIA_IRQ_PIRQD = 7,
 } ViaISAIRQSourceBit;
 
 void via_isa_set_irq(PCIDevice *d, ViaISAIRQSourceBit n, int level);
-- 
2.30.7