[PATCH] ppc64: Fix wrong register mapping in mpic driver

[Benjamin Herrenschmidt]

The mpic interrupt controller driver (used on G5 and early pSeries among
others) has a bug where it doesn't get the right virtual address for the
timer registers. It causes the driver to poke at the MMIO space of
whatever has been mapped just next to it (ouch !) when initializing and
causes boot failures on some IBM machines. This fixes it. Please apply.

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

Index: linux-work/arch/ppc64/kernel/mpic.c
===================================================================
--- linux-work.orig/arch/ppc64/kernel/mpic.c	2005-09-23 12:43:21.000000000 +1000
+++ linux-work/arch/ppc64/kernel/mpic.c	2005-10-26 10:21:53.000000000 +1000
@@ -506,8 +506,8 @@
 	mpic->senses_count = senses_count;
 
 	/* Map the global registers */
-	mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
-	mpic->tmregs = mpic->gregs + (MPIC_TIMER_BASE >> 2);
+	mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x2000);
+	mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2);
 	BUG_ON(mpic->gregs == NULL);
 
 	/* Reset */