[OpenBIOS] [PATCH 1/2] 40p: update interrupt routing code to match QEMU

[Mark Cave-Ayland]

Note that whilst guest OSs should be relying on residual data rather than the
OF device tree to determine the hardware, we still update the interrupt
properties to match the new code in QEMU for consistency.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>
---
 arch/ppc/qemu/init.c |  2 +-
 drivers/pci.c        | 24 ++++++++++++++++++++----
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/arch/ppc/qemu/init.c b/arch/ppc/qemu/init.c
index 759f7ac..f72728c 100644
--- a/arch/ppc/qemu/init.c
+++ b/arch/ppc/qemu/init.c
@@ -130,7 +130,7 @@ static const pci_arch_t known_arch[] = {
             { .type = MEMORY_SPACE_32, .parentaddr = 0, .childaddr = 0xc0100000, .len = 0x10000000 },
             { .type = 0, .parentaddr = 0, .childaddr = 0, .len = 0 }
          },
-        .irqs = { 9, 11, 9, 11 }
+        .irqs = { 15, 15, 15, 15 }
     },
     [ARCH_MAC99] = {
         .name = "MAC99",
diff --git a/drivers/pci.c b/drivers/pci.c
index 8f97ae1..92fd4af 100644
--- a/drivers/pci.c
+++ b/drivers/pci.c
@@ -1986,10 +1986,26 @@ static phandle_t ob_pci_host_set_interrupt_map(phandle_t host)
 static void ob_pci_host_bus_interrupt(ucell dnode, u32 *props, int *ncells, u32 addr, u32 intno)
 {
     *ncells += pci_encode_phys_addr(props + *ncells, 0, 0, addr, 0, 0);
-    props[(*ncells)++] = intno;
-    props[(*ncells)++] = dnode;
-    props[(*ncells)++] = arch->irqs[((intno - 1) + (addr >> 11)) & 3];
-    props[(*ncells)++] = 1;
+
+    if (is_oldworld() || is_newworld()) {
+        /* Mac machines */
+        props[(*ncells)++] = intno;
+        props[(*ncells)++] = dnode;
+        props[(*ncells)++] = arch->irqs[((intno - 1) + (addr >> 11)) & 3];
+        props[(*ncells)++] = 1;
+    } else {
+        /* PReP machines */
+        props[(*ncells)++] = intno;
+        props[(*ncells)++] = dnode;
+
+        if (PCI_DEV(addr) == 1 && PCI_FN(addr) == 0) {
+            /* LSI SCSI has fixed routing to IRQ 13 */
+            props[(*ncells)++] = 13;
+        } else {
+            props[(*ncells)++] = arch->irqs[((intno - 1) + (addr >> 11)) & 1];
+        }
+        props[(*ncells)++] = 1;
+    }
 }
 
 #elif defined(CONFIG_SPARC64)
-- 
2.11.0