71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/mipsregs.h>
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static unsigned long timestamp;
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/* how many counter cycles in a jiffy */
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#define CYCLES_PER_JIFFY \
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(CONFIG_SYS_MIPS_TIMER_FREQ + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ
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/*
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* timer without interrupts
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*/
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int timer_init(void)
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{
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/* Set up the timer for the first expiration. */
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write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY);
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return 0;
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}
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ulong get_timer(ulong base)
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{
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unsigned int count;
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unsigned int expirelo = read_c0_compare();
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/* Check to see if we have missed any timestamps. */
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count = read_c0_count();
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while ((count - expirelo) < 0x7fffffff) {
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expirelo += CYCLES_PER_JIFFY;
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timestamp++;
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}
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write_c0_compare(expirelo);
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return timestamp - base;
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}
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void __udelay(unsigned long usec)
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{
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unsigned int tmo;
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tmo = read_c0_count() + (usec * (CONFIG_SYS_MIPS_TIMER_FREQ / 1000000));
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while ((tmo - read_c0_count()) < 0x7fffffff)
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/*NOP*/;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On MIPS it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On MIPS it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return CONFIG_SYS_HZ;
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}
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