1 /* 2 * (C) Copyright 2002 3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 4 * Marius Groeger <mgroeger@sysgo.de> 5 * 6 * (C) Copyright 2002 7 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> 8 * 9 * See file CREDITS for list of people who contributed to this 10 * project. 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License as 14 * published by the Free Software Foundation; either version 2 of 15 * the License, or (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 25 * MA 02111-1307 USA 26 */ 27 28 /* 29 * CPU specific code 30 */ 31 32 #include <common.h> 33 #include <command.h> 34 #include <asm/system.h> 35 36 static void cache_flush(void); 37 38 int cleanup_before_linux (void) 39 { 40 /* 41 * this function is called just before we call linux 42 * it prepares the processor for linux 43 * 44 * we turn off caches etc ... 45 */ 46 47 disable_interrupts (); 48 49 /* ARM926E-S needs the protection unit enabled for the icache to have 50 * been enabled - left for possible later use 51 * should turn off the protection unit as well.... 52 */ 53 /* turn off I/D-cache */ 54 icache_disable(); 55 dcache_disable(); 56 /* flush I/D-cache */ 57 cache_flush(); 58 59 return 0; 60 } 61 62 /* flush I/D-cache */ 63 static void cache_flush (void) 64 { 65 unsigned long i = 0; 66 67 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); 68 asm ("mcr p15, 0, %0, c7, c6, 0": :"r" (i)); 69 } 70