2 * (C) Copyright 2008-2011
3 * Graeme Russ, <graeme.russ@gmail.com>
6 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/processor-flags.h>
30 #include <asm/arch/sc520.h>
32 DECLARE_GLOBAL_DATA_PTR;
34 sc520_mmcr_t *sc520_mmcr = (sc520_mmcr_t *)SC520_MMCR_BASE;
38 if (CONFIG_SYS_SC520_HIGH_SPEED) {
39 /* set it to 133 MHz and write back */
40 writeb(0x02, &sc520_mmcr->cpuctl);
41 gd->cpu_clk = 133000000;
43 /* set it to 100 MHz and write back */
44 writeb(0x01, &sc520_mmcr->cpuctl);
45 gd->cpu_clk = 100000000;
48 /* wait at least one millisecond */
49 asm("movl $0x2000, %%ecx\n"
52 "loop 0b\n" : : : "ecx");
54 return x86_cpu_init_f();
59 /* Disable the PAR used for CAR */
60 writel(0x0000000, &sc520_mmcr->par[2]);
62 /* turn on the SDRAM write buffer */
63 writeb(0x11, &sc520_mmcr->dbctl);
65 return x86_cpu_init_r();