1 /* 2 * (C) Copyright 2008 Texas Insturments 3 * 4 * (C) Copyright 2002 5 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 6 * Marius Groeger <mgroeger@sysgo.de> 7 * 8 * (C) Copyright 2002 9 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> 10 * 11 * See file CREDITS for list of people who contributed to this 12 * project. 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License as 16 * published by the Free Software Foundation; either version 2 of 17 * the License, or (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 27 * MA 02111-1307 USA 28 */ 29 30 /* 31 * CPU specific code 32 */ 33 34 #include <common.h> 35 #include <command.h> 36 #include <asm/system.h> 37 #include <asm/cache.h> 38 #include <asm/armv7.h> 39 #include <linux/compiler.h> 40 41 void __weak cpu_cache_initialization(void){} 42 43 int cleanup_before_linux(void) 44 { 45 /* 46 * this function is called just before we call linux 47 * it prepares the processor for linux 48 * 49 * we turn off caches etc ... 50 */ 51 #ifndef CONFIG_SPL_BUILD 52 disable_interrupts(); 53 #endif 54 55 /* 56 * Turn off I-cache and invalidate it 57 */ 58 icache_disable(); 59 invalidate_icache_all(); 60 61 /* 62 * turn off D-cache 63 * dcache_disable() in turn flushes the d-cache and disables MMU 64 */ 65 dcache_disable(); 66 v7_outer_cache_disable(); 67 68 /* 69 * After D-cache is flushed and before it is disabled there may 70 * be some new valid entries brought into the cache. We are sure 71 * that these lines are not dirty and will not affect our execution. 72 * (because unwinding the call-stack and setting a bit in CP15 SCTRL 73 * is all we did during this. We have not pushed anything on to the 74 * stack. Neither have we affected any static data) 75 * So just invalidate the entire d-cache again to avoid coherency 76 * problems for kernel 77 */ 78 invalidate_dcache_all(); 79 80 /* 81 * Some CPU need more cache attention before starting the kernel. 82 */ 83 cpu_cache_initialization(); 84 85 return 0; 86 } 87