openwrtv4/target/linux/mvebu/patches-3.10/0025-arm-mvebu-avoid-hardcoded-virtual-address-in-coheren.patch

From a4dd628f515f361cecfae08e568891442042e4e2 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Wed, 5 Jun 2013 09:04:55 +0200
Subject: [PATCH 025/203] arm: mvebu: avoid hardcoded virtual address in
 coherency code

Now that the coherency_get_cpu_count() function no longer requires a
very early mapping of the coherency unit registers, we can avoid the
hardcoded virtual address in coherency.c. However, the coherency
features are still used quite early, so we need to do the of_iomap()
early enough, at the ->init_timer() level, so we have the call of
coherency_init() at this point.

Unfortunately, at ->init_timer() time, it is not possible to register
a bus notifier, so we add a separate coherency_late_init() function
that gets called as as postcore_initcall(), when bus notifiers are
available.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
---
 arch/arm/mach-mvebu/armada-370-xp.c |  2 +-
 arch/arm/mach-mvebu/coherency.c     | 20 ++++++++++----------
 2 files changed, 11 insertions(+), 11 deletions(-)

--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c
@@ -47,6 +47,7 @@ static void __init armada_370_xp_timer_a
 {
 	mvebu_clocks_init();
 	armada_370_xp_timer_init();
+	coherency_init();
 }
 
 static void __init armada_370_xp_init_early(void)
@@ -76,7 +77,6 @@ static void __init armada_370_xp_init_ea
 static void __init armada_370_xp_dt_init(void)
 {
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
-	coherency_init();
 }
 
 static const char * const armada_370_xp_dt_compat[] = {
--- a/arch/arm/mach-mvebu/coherency.c
+++ b/arch/arm/mach-mvebu/coherency.c
@@ -27,14 +27,7 @@
 #include <asm/smp_plat.h>
 #include "armada-370-xp.h"
 
-/*
- * Some functions in this file are called very early during SMP
- * initialization. At that time the device tree framework is not yet
- * ready, and it is not possible to get the register address to
- * ioremap it. That's why the pointer below is given with an initial
- * value matching its virtual mapping
- */
-static void __iomem *coherency_base = ARMADA_370_XP_REGS_VIRT_BASE + 0x20200;
+static void __iomem *coherency_base;
 static void __iomem *coherency_cpu_base;
 
 /* Coherency fabric registers */
@@ -135,9 +128,16 @@ int __init coherency_init(void)
 		coherency_base = of_iomap(np, 0);
 		coherency_cpu_base = of_iomap(np, 1);
 		set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
-		bus_register_notifier(&platform_bus_type,
-					&mvebu_hwcc_platform_nb);
 	}
 
 	return 0;
 }
+
+static int __init coherency_late_init(void)
+{
+	bus_register_notifier(&platform_bus_type,
+			      &mvebu_hwcc_platform_nb);
+	return 0;
+}
+
+postcore_initcall(coherency_late_init);