powerpc: Run on old powermacs.

Old powermacs have a number of differences from current machines:
- there is no interrupt tree in the device tree, just interrupt
  or AAPL,interrupt properties
- the chosen node in the device tree is called /chosen@0
- the OF claim method doesn't map the memory, so we have to do
  an explicit map call as well
- there is no /chosen/cpu property on SMP machines
- the NVRAM isn't structured as a set of partitions.

This adapts the merged powermac support code to cope with these
issues.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 35 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index c8d288457b4c..69f69c38fd27 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -309,6 +309,37 @@ static int __devinit finish_node_interrupts(struct device_node *np,
         unsigned int *irq, virq;
         struct device_node *ic;
 
+        if (num_interrupt_controllers == 0) {
+                /*
+                 * Old machines just have a list of interrupt numbers
+                 * and no interrupt-controller nodes.
+                 */
+                ints = (unsigned int *) get_property(np, "AAPL,interrupts",
+                                                     &intlen);
+                /* XXX old interpret_pci_props looked in parent too */
+                /* XXX old interpret_macio_props looked for interrupts
+                   before AAPL,interrupts */
+                if (ints == NULL)
+                        ints = (unsigned int *) get_property(np, "interrupts",
+                                                             &intlen);
+                if (ints == NULL)
+                        return 0;
+
+                np->n_intrs = intlen / sizeof(unsigned int);
+                np->intrs = prom_alloc(np->n_intrs * sizeof(np->intrs[0]),
+                                       mem_start);
+                if (!np->intrs)
+                        return -ENOMEM;
+                if (measure_only)
+                        return 0;
+
+                for (i = 0; i < np->n_intrs; ++i) {
+                        np->intrs[i].line = *ints++;
+                        np->intrs[i].sense = 1;
+                }
+                return 0;
+        }
+
         ints = (unsigned int *) get_property(np, "interrupts", &intlen);
         if (ints == NULL)
                 return 0;
@@ -1024,6 +1055,8 @@ void __init unflatten_device_tree(void)
 
         /* Get pointer to OF "/chosen" node for use everywhere */
         of_chosen = of_find_node_by_path("/chosen");
+        if (of_chosen == NULL)
+                of_chosen = of_find_node_by_path("/chosen@0");
 
         /* Retreive command line */
         if (of_chosen != NULL) {
@@ -1123,7 +1156,8 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
 
         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 
-        if (depth != 1 || strcmp(uname, "chosen") != 0)
+        if (depth != 1 ||
+            (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
                 return 0;
 
         /* get platform type */