mirror of
https://github.com/brain-hackers/u-boot-brain
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74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
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/*
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* (C) Copyright 2002
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* Daniel Engstr<EFBFBD>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, but independent of implementation */
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#include <common.h>
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#include <asm/interrupt.h>
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#include <asm/ic/sc520.h>
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void reset_timer(void)
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{
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write_mmcr_word(SC520_GPTMR0CNT, 0);
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write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
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}
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ulong get_timer(ulong base)
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{
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/* fixme: 30 or 33 */
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return read_mmcr_word(SC520_GPTMR0CNT) / 33;
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}
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void set_timer(ulong t)
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{
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/* FixMe: use two cascade coupled timers */
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write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
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write_mmcr_word(SC520_GPTMR0CNT, t*33);
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write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
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}
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void udelay(unsigned long usec)
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{
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int m=0;
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long u;
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read_mmcr_word(SC520_SWTMRMILLI);
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read_mmcr_word(SC520_SWTMRMICRO);
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#if 0
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/* do not enable this line, udelay is used in the serial driver -> recursion */
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printf("udelay: %ld m.u %d.%d tm.tu %d.%d\n", usec, m, u, tm, tu);
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#endif
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while (1) {
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m += read_mmcr_word(SC520_SWTMRMILLI);
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u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);
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if (usec <= u) {
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break;
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}
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}
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}
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