3 * Daniel Engstr�m, Omicron Ceti AB <daniel@omicron.se>.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 /* stuff specific for the sc520,
25 * but idependent of implementation */
29 #include <asm/processor-flags.h>
30 #include <asm/ic/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;
49 /* wait at least one millisecond */
50 asm("movl $0x2000, %%ecx\n"
53 "loop 0b\n": : : "ecx");
55 /* turn on the SDRAM write buffer */
56 writeb(0x11, &sc520_mmcr->dbctl);
58 return x86_cpu_init_f();
61 #ifdef CONFIG_SYS_SC520_RESET
62 void reset_cpu(ulong addr)
64 printf("Resetting using SC520 MMCR\n");
65 /* Write a '1' to the SYS_RST of the RESCFG MMCR */
66 writeb(0x01, &sc520_mmcr->rescfg);