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 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 8 * Alex Zuepke <azu@sysgo.de> 9 * 10 * See file CREDITS for list of people who contributed to this 11 * project. 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License as 15 * published by the Free Software Foundation; either version 2 of 16 * the License, or (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 26 * MA 02111-1307 USA 27 */ 28 29 /* 30 * CPU specific code 31 */ 32 33 #include <common.h> 34 #include <command.h> 35 #include <asm/system.h> 36 37 #ifdef CONFIG_USE_IRQ 38 DECLARE_GLOBAL_DATA_PTR; 39 #endif 40 41 static void cache_flush(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 * just disable everything that can disturb booting linux 50 */ 51 52 disable_interrupts (); 53 54 /* turn off I-cache */ 55 icache_disable(); 56 dcache_disable(); 57 58 /* flush I-cache */ 59 cache_flush(); 60 61 return (0); 62 } 63 64 /* flush I/D-cache */ 65 static void cache_flush (void) 66 { 67 unsigned long i = 0; 68 69 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); 70 } 71