[U-Boot] [PATCH] arm, arm-kirkwood: disable l2c before linux boot

[Michael Walle]

The decompressor expects the L2 cache to be disabled. This fixes booting
some kernels, which have CONFIG_ARM_PATCH_PHYS_VIRT enabled.

Signed-off-by: Michael Walle <michael at walle.cc>
Cc: Albert ARIBAUD <albert.u.boot at aribaud.net>
Cc: Prafulla Wadaskar <prafulla at marvell.com>
---
 arch/arm/cpu/arm926ejs/cache.c           |   15 +++++++++++
 arch/arm/cpu/arm926ejs/cpu.c             |    2 +
 arch/arm/cpu/arm926ejs/kirkwood/Makefile |    1 +
 arch/arm/cpu/arm926ejs/kirkwood/cache.c  |   41 ++++++++++++++++++++++++++++++
 4 files changed, 59 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/cpu/arm926ejs/kirkwood/cache.c

diff --git a/arch/arm/cpu/arm926ejs/cache.c b/arch/arm/cpu/arm926ejs/cache.c
index 4415642..7a7d0a6 100644
--- a/arch/arm/cpu/arm926ejs/cache.c
+++ b/arch/arm/cpu/arm926ejs/cache.c
@@ -73,3 +73,18 @@ void  flush_cache(unsigned long start, unsigned long size)
 {
 }
 #endif /* #ifndef CONFIG_SYS_DCACHE_OFF */
+
+/*
+ * Stub implementations for l2 cache operations
+ */
+void __l2_cache_enable(void)
+{
+}
+void l2_cache_enable(void)
+        __attribute__((weak, alias("__l2_cache_enable")));
+
+void __l2_cache_disable(void)
+{
+}
+void l2_cache_disable(void)
+        __attribute__((weak, alias("__l2_cache_disable")));
diff --git a/arch/arm/cpu/arm926ejs/cpu.c b/arch/arm/cpu/arm926ejs/cpu.c
index 5c902df..626384c 100644
--- a/arch/arm/cpu/arm926ejs/cpu.c
+++ b/arch/arm/cpu/arm926ejs/cpu.c
@@ -50,6 +50,8 @@ int cleanup_before_linux (void)
 	/* turn off I/D-cache */
 	icache_disable();
 	dcache_disable();
+	l2_cache_disable();
+
 	/* flush I/D-cache */
 	cache_flush();
 
diff --git a/arch/arm/cpu/arm926ejs/kirkwood/Makefile b/arch/arm/cpu/arm926ejs/kirkwood/Makefile
index 0754297..777006c 100644
--- a/arch/arm/cpu/arm926ejs/kirkwood/Makefile
+++ b/arch/arm/cpu/arm926ejs/kirkwood/Makefile
@@ -30,6 +30,7 @@ COBJS-y	= cpu.o
 COBJS-y	+= dram.o
 COBJS-y	+= mpp.o
 COBJS-y	+= timer.o
+COBJS-y	+= cache.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS-y:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS-y))
diff --git a/arch/arm/cpu/arm926ejs/kirkwood/cache.c b/arch/arm/cpu/arm926ejs/kirkwood/cache.c
new file mode 100644
index 0000000..84207f7
--- /dev/null
+++ b/arch/arm/cpu/arm926ejs/kirkwood/cache.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2011 Michael Walle
+ * Michael Walle <michael at walle.cc>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+#include <common.h>
+#include <asm/arch/cpu.h>
+
+void l2_cache_enable()
+{
+	u32 ctrl;
+
+	ctrl = readfr_extra_feature_reg();
+	ctrl |= 1 << 22;	/* enable l2 cache */
+	writefr_extra_feature_reg(ctrl);
+}
+
+void l2_cache_disable()
+{
+	u32 ctrl;
+
+	ctrl = readfr_extra_feature_reg();
+	ctrl &= ~(1 << 22);	/* disable l2 cache */
+	writefr_extra_feature_reg(ctrl);
+}
-- 
1.7.2.5