1 /*
2 * (C) Copyright 2004 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
38 static void cache_flush (void);
39
cleanup_before_linux(void)40 int cleanup_before_linux (void)
41 {
42 /*
43 * this function is called just before we call linux
44 * it prepares the processor for linux
45 *
46 * we turn off caches etc ...
47 */
48
49 disable_interrupts ();
50
51 /* turn off I/D-cache */
52 icache_disable();
53 dcache_disable();
54 /* flush I/D-cache */
55 cache_flush();
56
57 return 0;
58 }
59
60 /* flush I/D-cache */
cache_flush(void)61 static void cache_flush (void)
62 {
63 /* invalidate both caches and flush btb */
64 asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (0));
65 /* mem barrier to sync things */
66 asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (0));
67 }
68