1 /*
2 * arch/ppc/simple/misc-44x.c
3 *
4 * Misc. bootloader code for IBM PPC 44x reference boards (Ebony, Ocotea)
5 *
6 * Matt Porter <mporter@mvista.com>
7 * Eugene Surovegin <ebs@ebshome.net>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14 #include <linux/config.h>
15 #include <linux/types.h>
16 #include <asm/io.h>
17 #include <asm/processor.h>
18 #include <asm/ibm4xx.h>
19
20 extern struct bi_record *decompress_kernel(unsigned long load_addr,
21 int num_words, unsigned long cksum);
22 extern unsigned long timebase_period_ns;
23
24 struct bi_record *
load_kernel(unsigned long load_addr,int num_words,unsigned long cksum)25 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
26 {
27 timebase_period_ns = 3;
28 mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR); /* reset MAL */
29 while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {}; /* wait for reset */
30 *(volatile unsigned long *)PPC44x_EMAC0_MR0 = 0x20000000; /* reset EMAC */
31 eieio();
32
33 return decompress_kernel(load_addr, num_words, cksum);
34 }
35