3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <asm/mipsregs.h>
11 static unsigned long timestamp;
13 /* how many counter cycles in a jiffy */
14 #define CYCLES_PER_JIFFY (CONFIG_SYS_MIPS_TIMER_FREQ + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ
17 * timer without interrupts
22 /* Set up the timer for the first expiration. */
23 write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY);
28 ulong get_timer(ulong base)
31 unsigned int expirelo = read_c0_compare();
33 /* Check to see if we have missed any timestamps. */
34 count = read_c0_count();
35 while ((count - expirelo) < 0x7fffffff) {
36 expirelo += CYCLES_PER_JIFFY;
39 write_c0_compare(expirelo);
41 return (timestamp - base);
44 void __udelay(unsigned long usec)
48 tmo = read_c0_count() + (usec * (CONFIG_SYS_MIPS_TIMER_FREQ / 1000000));
49 while ((tmo - read_c0_count()) < 0x7fffffff)
54 * This function is derived from PowerPC code (read timebase as long long).
55 * On MIPS it just returns the timer value.
57 unsigned long long get_ticks(void)
63 * This function is derived from PowerPC code (timebase clock frequency).
64 * On MIPS it returns the number of timer ticks per second.