From 679530278d5a79d34e356ad2d452f4400953bfc2 Mon Sep 17 00:00:00 2001 From: Michael Walle <[michael@walle.cc]> Date: Mon, 6 Feb 2012 22:42:10 +0530 Subject: [PATCH] arm, arm-kirkwood: disable l2c before linux boot 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 Acked-by: Prafulla Wadaskar Cc: Albert ARIBAUD Cc: Prafulla Wadaskar Cc: Wolfgang Denk --- arch/arm/cpu/arm926ejs/cache.c | 9 +++++++ arch/arm/cpu/arm926ejs/cpu.c | 2 ++ arch/arm/cpu/arm926ejs/kirkwood/Makefile | 1 + arch/arm/cpu/arm926ejs/kirkwood/cache.c | 34 ++++++++++++++++++++++++ 4 files changed, 46 insertions(+) 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 ee90ab7195..504f604684 100644 --- a/arch/arm/cpu/arm926ejs/cache.c +++ b/arch/arm/cpu/arm926ejs/cache.c @@ -68,3 +68,12 @@ void flush_cache(unsigned long start, unsigned long size) { } #endif /* #ifndef CONFIG_SYS_DCACHE_OFF */ + +/* + * Stub implementations for l2 cache operations + */ +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 5c902dfc13..626384c3fc 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 07542975e6..777006c4fd 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 0000000000..645d962661 --- /dev/null +++ b/arch/arm/cpu/arm926ejs/kirkwood/cache.c @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2012 Michael Walle + * Michael Walle + * + * 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 +#include + +#define FEROCEON_EXTRA_FEATURE_L2C_EN (1<<22) + +void l2_cache_disable() +{ + u32 ctrl; + + ctrl = readfr_extra_feature_reg(); + ctrl &= ~FEROCEON_EXTRA_FEATURE_L2C_EN; + writefr_extra_feature_reg(ctrl); +} -- 2.39.2