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https://github.com/AsahiLinux/u-boot
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71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* (C) Copyright 2002
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* Daniel Engstr<74>m, Omicron Ceti AB <daniel@omicron.se>.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/* stuff specific for the sc520,
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* but idependent of implementation */
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#include <common.h>
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#include <asm/io.h>
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#include <asm/processor-flags.h>
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#include <asm/ic/sc520.h>
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DECLARE_GLOBAL_DATA_PTR;
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sc520_mmcr_t *sc520_mmcr = (sc520_mmcr_t *)SC520_MMCR_BASE;
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int cpu_init_f(void)
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{
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if (CONFIG_SYS_SC520_HIGH_SPEED) {
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/* set it to 133 MHz and write back */
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writeb(0x02, &sc520_mmcr->cpuctl);
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gd->cpu_clk = 133000000;
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} else {
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/* set it to 100 MHz and write back */
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writeb(0x01, &sc520_mmcr->cpuctl);
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gd->cpu_clk = 100000000;
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}
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/* wait at least one millisecond */
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asm("movl $0x2000, %%ecx\n"
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"0: pushl %%ecx\n"
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"popl %%ecx\n"
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"loop 0b\n": : : "ecx");
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if (gd->flags & GD_FLG_COLD_BOOT) {
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/* turn on the SDRAM write buffer */
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writeb(0x11, &sc520_mmcr->dbctl);
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}
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return x86_cpu_init_f();
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}
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#ifdef CONFIG_SYS_SC520_RESET
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void reset_cpu(ulong addr)
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{
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printf("Resetting using SC520 MMCR\n");
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/* Write a '1' to the SYS_RST of the RESCFG MMCR */
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writeb(0x01, &sc520_mmcr->rescfg);
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/* NOTREACHED */
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}
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#endif
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