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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/cris/include/arch-v10/arch/timex.h
1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Use prescale timer at 25000 Hz instead of the baudrate timer at
4 * 19200 to get rid of the 64ppm to fast timer (and we get better
5 * resolution within a jiffie as well.
7 #ifndef _ASM_CRIS_ARCH_TIMEX_H
8 #define _ASM_CRIS_ARCH_TIMEX_H
10 /* The prescaler clock runs at 25MHz, we divide it by 1000 in the prescaler */
11 /* If you change anything here you must check time.c as well... */
12 #define PRESCALE_FREQ 25000000
13 #define PRESCALE_VALUE 1000
14 #define CLOCK_TICK_RATE 25000 /* Underlying frequency of the HZ timer */
15 /* The timer0 values gives 40us resolution (1/25000) but interrupts at HZ*/
16 #define TIMER0_FREQ (CLOCK_TICK_RATE)
17 #define TIMER0_CLKSEL flexible
18 #define TIMER0_DIV (TIMER0_FREQ/(HZ))
21 #define GET_JIFFIES_USEC() \
22 ( (TIMER0_DIV - *R_TIMER0_DATA) * (1000000/HZ)/TIMER0_DIV )
24 unsigned long get_ns_in_jiffie(void);
26 static inline unsigned long get_us_in_jiffie_highres(void)
28 return get_ns_in_jiffie()/1000;