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Diffstat (limited to 'arch/arm/cpu/armv7/cpu.c')
-rw-r--r-- | arch/arm/cpu/armv7/cpu.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c new file mode 100644 index 0000000..39a8023 --- /dev/null +++ b/arch/arm/cpu/armv7/cpu.c @@ -0,0 +1,86 @@ +/* + * (C) Copyright 2008 Texas Insturments + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Marius Groeger <mgroeger@sysgo.de> + * + * (C) Copyright 2002 + * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * CPU specific code + */ + +#include <common.h> +#include <command.h> +#include <asm/system.h> +#include <asm/cache.h> +#include <asm/armv7.h> +#include <linux/compiler.h> + +void __weak cpu_cache_initialization(void){} + +int cleanup_before_linux(void) +{ + /* + * this function is called just before we call linux + * it prepares the processor for linux + * + * we turn off caches etc ... + */ +#ifndef CONFIG_SPL_BUILD + disable_interrupts(); +#endif + + /* + * Turn off I-cache and invalidate it + */ + icache_disable(); + invalidate_icache_all(); + + /* + * turn off D-cache + * dcache_disable() in turn flushes the d-cache and disables MMU + */ + dcache_disable(); + v7_outer_cache_disable(); + + /* + * After D-cache is flushed and before it is disabled there may + * be some new valid entries brought into the cache. We are sure + * that these lines are not dirty and will not affect our execution. + * (because unwinding the call-stack and setting a bit in CP15 SCTRL + * is all we did during this. We have not pushed anything on to the + * stack. Neither have we affected any static data) + * So just invalidate the entire d-cache again to avoid coherency + * problems for kernel + */ + invalidate_dcache_all(); + + /* + * Some CPU need more cache attention before starting the kernel. + */ + cpu_cache_initialization(); + + return 0; +} |