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authorHollis Blanchard <hollisb@us.ibm.com>2006-05-25 16:36:53 -0500
committerPaul Mackerras <paulus@samba.org>2006-05-26 22:39:00 +1000
commit54f4ee183aea859eb09f141dad3fc3c6f4fe0446 (patch)
tree94bfc121c036460c64f7a72f9a46152ee6fdd263 /arch/powerpc/kernel/prom_init.c
parent8e30a9a299ca30b6c4072c2182238d5f5dd1590d (diff)
[PATCH] powerpc: fix RTC/NVRAM accesses on Maple
Due to a firmware device tree bug, RTC and NVRAM accesses (including halt/reboot) on Maple have been broken since January, when an untested build fix went in. This code patches the device tree in Linux. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/prom_init.c')
-rw-r--r--arch/powerpc/kernel/prom_init.c48
1 files changed, 45 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 2d80653aa2a..41e9ab40cd5 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2057,10 +2057,45 @@ static void __init flatten_device_tree(void)
}
-
-static void __init fixup_device_tree(void)
+#ifdef CONFIG_PPC_MAPLE
+/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
+ * The values are bad, and it doesn't even have the right number of cells. */
+static void __init fixup_device_tree_maple(void)
{
+ phandle isa;
+ u32 isa_ranges[6];
+
+ isa = call_prom("finddevice", 1, 1, ADDR("/ht@0/isa@4"));
+ if (!PHANDLE_VALID(isa))
+ return;
+
+ if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
+ == PROM_ERROR)
+ return;
+
+ if (isa_ranges[0] != 0x1 ||
+ isa_ranges[1] != 0xf4000000 ||
+ isa_ranges[2] != 0x00010000)
+ return;
+
+ prom_printf("fixing up bogus ISA range on Maple...\n");
+
+ isa_ranges[0] = 0x1;
+ isa_ranges[1] = 0x0;
+ isa_ranges[2] = 0x01002000; /* IO space; PCI device = 4 */
+ isa_ranges[3] = 0x0;
+ isa_ranges[4] = 0x0;
+ isa_ranges[5] = 0x00010000;
+ prom_setprop(isa, "/ht@0/isa@4", "ranges",
+ isa_ranges, sizeof(isa_ranges));
+}
+#else
+#define fixup_device_tree_maple()
+#endif
+
#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
+static void __init fixup_device_tree_pmac(void)
+{
phandle u3, i2c, mpic;
u32 u3_rev;
u32 interrupts[2];
@@ -2097,9 +2132,16 @@ static void __init fixup_device_tree(void)
parent = (u32)mpic;
prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
&parent, sizeof(parent));
-#endif
}
+#else
+#define fixup_device_tree_pmac()
+#endif
+static void __init fixup_device_tree(void)
+{
+ fixup_device_tree_maple();
+ fixup_device_tree_pmac();
+}
static void __init prom_find_boot_cpu(void)
{