[Qemu-arm] [RFC 2/7] Add a function to determine interrupt number for INTx routing

[Eric Auger <eric.auger@linaro.org>]

This patch adds a PCI bus specific function pointer "route_intx_to_irq"
for GPEX. This is used in detemining PCI INTx number from pin.

Signed-off-by: Pranavkumar Sawargaonkar <address@hidden>
Signed-off-by: Tushar Jagad <address@hidden>
---
 hw/pci-host/gpex.c         | 12 ++++++++++++
 include/hw/pci-host/gpex.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/hw/pci-host/gpex.c b/hw/pci-host/gpex.c
index 9d8fb5a..d0d1250 100644
--- a/hw/pci-host/gpex.c
+++ b/hw/pci-host/gpex.c
@@ -42,6 +42,17 @@ static void gpex_set_irq(void *opaque, int irq_num, int level)
     qemu_set_irq(s->irq[irq_num], level);
 }
 
+static PCIINTxRoute gpex_route_intx_pin_to_irq(void *opaque, int pin)
+{
+    PCIINTxRoute route;
+    GPEXHost *s = opaque;
+
+    route.mode = PCI_INTX_ENABLED;
+    route.irq = (int)s->irq_num[pin];
+
+    return route;
+}
+
 static void gpex_host_realize(DeviceState *dev, Error **errp)
 {
     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
@@ -66,6 +77,7 @@ static void gpex_host_realize(DeviceState *dev, Error **errp)
                                 &s->io_ioport, 0, 4, TYPE_PCIE_BUS);
 
     qdev_set_parent_bus(DEVICE(&s->gpex_root), BUS(pci->bus));
+    pci_bus_set_route_irq_fn(pci->bus, gpex_route_intx_pin_to_irq);
     qdev_init_nofail(DEVICE(&s->gpex_root));
 }
 
diff --git a/include/hw/pci-host/gpex.h b/include/hw/pci-host/gpex.h
index 68c9348..7df1c16 100644
--- a/include/hw/pci-host/gpex.h
+++ b/include/hw/pci-host/gpex.h
@@ -51,6 +51,7 @@ typedef struct GPEXHost {
     MemoryRegion io_ioport;
     MemoryRegion io_mmio;
     qemu_irq irq[GPEX_NUM_IRQS];
+    uint32_t irq_num[GPEX_NUM_IRQS];
 } GPEXHost;
 
 #endif /* HW_GPEX_H */
-- 
1.9.1