node has specified both of these two properties to be 2. However, the actual
"cell" value for host bridge node is 1. we have to provide one fixup function.

Signed-off-by: Tiejun Chen <tiejun.china@gmail.com>
---
arch/powerpc/kernel/prom_init.c | 42 +++++++++++++++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 2445945..9cd23b6 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1948,8 +1948,49 @@ static void __init fixup_device_tree_maple(void)
prom_setprop(isa, name, "ranges",
isa_ranges, sizeof(isa_ranges));
}
+
+/* On Maple 64bit target host bridge parent node has specified address and
+ * size properties to be 2. But the actual "cell" value for host bridge node
+ * is 1 since early MOTLoad internal bug. */
+static void __init fixup_device_tree_maple_hb(void)
+{
+ phandle hb;
+ u32 hb_ranges[4];
+ u32 size_cell, addr_cell;
+ struct prom_t *_prom = &RELOC(prom);
+ char *name;
+
+ name = "/hostbridge@f8000000";
+ hb = call_prom("finddevice", 1, 1, ADDR(name));
+ if (!PHANDLE_VALID(hb))
+ return;
+
+ if (prom_getproplen(hb, "reg") != 8)
+ return;
+
+ if (prom_getprop(hb, "reg", hb_ranges, (sizeof(hb_ranges))/2)
+ == PROM_ERROR)
+ return;
+
+ prom_getprop(_prom->root, "#address-cells", &addr_cell, sizeof(addr_cell));
+ prom_getprop(_prom->root, "#size-cells", &size_cell, sizeof(size_cell));
+
+ if ((addr_cell != 2) || (size_cell != 2) ||
+ (hb_ranges[0] != 0xf8000000))
+ return;
+
+ prom_printf("Fixing up bogus HOSTBRIDGE reg on Maple/Apache...\n");
+
+ hb_ranges[3] = hb_ranges[1];
+ hb_ranges[1] = hb_ranges[0];
+ hb_ranges[0] = hb_ranges[2] = 0;
+ prom_setprop(hb, name, "reg",
+ hb_ranges, sizeof(hb_ranges));
+}
+
#else
#define fixup_device_tree_maple()
+#define fixup_device_tree_maple_hb()
#endif

#ifdef CONFIG_PPC_CHRP
@@ -2190,6 +2231,7 @@ static void __init fixup_device_tree_efika(void)
static void __init fixup_device_tree(void)
{
fixup_device_tree_maple();
+ fixup_device_tree_maple_hb();
fixup_device_tree_chrp();
fixup_device_tree_pmac();
fixup_device_tree_efika();
--
1.5.6