The device tree on the Nemo passes all of the i8259 interruts with
numbers between 212 and 222, and points their interrupt-parent property
to the pasemi-opic, requiring custom patches to the kernel.
Fix the values so that they can be controlled by the generic ppc i8259
code.
Signed-off-by: Darren Stevens <dar...@stevens-zone.net>
---
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 4e74fc5..8269093 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2639,6 +2639,69 @@ static void __init fixup_device_tree_efika(void)
#else
#define fixup_device_tree_efika()
#endif
+#ifdef CONFIG_PPC_PASEMI
+static void __init fixup_device_tree_pasemi(void)
+{
+#ifdef CONFIG_PPC_PASEMI_NEMO
+/*
+ * CFE supplied on Nemo is broken in several ways, biggest
+ * problem is that it reassigns ISA interrupts to unused mpic ints.
+ * Add an interrupt-controller property for the io-bridge to use
+ * and correct the ints so we can attach them to an irq_domain
+ */
+ phandle iob, node;
+ u32 interrupts[2];
+ u32 parent;
+ u32 val = 0, rval;
+ char * name, * pci_name;
+
+ /* Find the root pci node */
+ name = "/pxp@0,e0000000";
+ iob = call_prom("finddevice", 1, 1, ADDR(name));
+ if (!PHANDLE_VALID(iob))
+ return;
+
+ /* check if interrupt-controller node set yet */
+ if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
+ return;
+
+ prom_printf("adding interrupt-controller property for SB600...\n");
+
+ prom_setprop(iob, name, "interrupt-controller", &val, 0);
+
+ pci_name = "/pxp@0,e0000000/pci@11";
+ node = call_prom("finddevice", 1, 1, ADDR(pci_name));
+ parent = ADDR(iob);
+ for( ; prom_next_node(&node); ) {
+ /* scan each node for one with an interrupt */
+ if (PHANDLE_VALID(node)) {
+ rval = prom_getproplen(node, "interrupts");
+ if (rval != 0 && rval != PROM_ERROR) {
+ prom_getprop(node, "interrupts", &interrupts,
sizeof(interrupts));
+ if ((interrupts[0] > 211) && (interrupts[0] <
223)) {
+ /* found a node, update both interrupts
and interrupt-parent */
+ if ((interrupts[0] > 211) &&
(interrupts[0] < 216))
+ interrupts[0] -= 203;
+ if ((interrupts[0] > 215) &&
(interrupts[0] < 221))
+ interrupts[0] -= 213;
+ if (interrupts[0] == 221)
+ interrupts[0] = 14;
+ if (interrupts[0] == 222)
+ interrupts[0] = 8;
+
+ prom_setprop(node, pci_name,
"interrupts", interrupts,
+
sizeof(interrupts));
+ prom_setprop(node, pci_name,
"interrupt-parent", &parent,
+ sizeof(parent));
+ }
+ }
+ }
+ }
+#endif //CONFIG_PPC_PASEMI_NEMO
+}
+#else
+#define fixup_device_tree_pasemi()
+#endif
static void __init fixup_device_tree(void)
{
@@ -2647,6 +2710,7 @@ static void __init fixup_device_tree(void)
fixup_device_tree_chrp();
fixup_device_tree_pmac();
fixup_device_tree_efika();
+ fixup_device_tree_pasemi();
}
static void __init prom_find_boot_cpu(void)
