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 <arm925t.h>
35 #include <asm/system.h>
36
37 static void cache_flush(void);
38
cleanup_before_linux(void)39 int cleanup_before_linux (void)
40 {
41 /*
42 * this function is called just before we call linux
43 * it prepares the processor for linux
44 *
45 * we turn off caches etc ...
46 */
47
48 disable_interrupts ();
49
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 unsigned long i = 0;
64
65 asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
66 }
67