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/* SPDX-License-Identifier: GPL-2.0-or-later */
* Common time prototypes and such for all ppc machines.
* Written by Cort Dougan ( to merge
* Paul Mackerras' version and mine for PReP and Pmac.
#ifndef __POWERPC_TIME_H
#define __POWERPC_TIME_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/percpu.h>
#include <asm/processor.h>
#include <asm/cpu_has_feature.h>
#include <asm/vdso/timebase.h>
/* time.c */
extern unsigned long tb_ticks_per_jiffy;
extern unsigned long tb_ticks_per_usec;
extern unsigned long tb_ticks_per_sec;
extern struct clock_event_device decrementer_clockevent;
extern void generic_calibrate_decr(void);
/* Some sane defaults: 125 MHz timebase, 1GHz processor */
extern unsigned long ppc_proc_freq;
extern unsigned long ppc_tb_freq;
#define DEFAULT_TB_FREQ 125000000UL
extern bool tb_invalid;
struct div_result {
u64 result_high;
u64 result_low;
static inline u64 get_vtb(void)
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return mfspr(SPRN_VTB);
return 0;
/* Accessor functions for the decrementer register.
* The 4xx doesn't even have a decrementer. I tried to use the
* generic timer interrupt code, which seems OK, with the 4xx PIT
* in auto-reload mode. The problem is PIT stops counting when it
* hits zero. If it would wrap, we could use it just like a decrementer.
static inline u64 get_dec(void)
return mfspr(SPRN_PIT);
return mfspr(SPRN_DEC);
* Note: Book E and 4xx processors differ from other PowerPC processors
* in when the decrementer generates its interrupt: on the 1 to 0
* transition for Book E/4xx, but on the 0 to -1 transition for others.
static inline void set_dec(u64 val)
mtspr(SPRN_PIT, (u32)val);
mtspr(SPRN_DEC, val);
mtspr(SPRN_DEC, val - 1);
static inline unsigned long tb_ticks_since(unsigned long tstamp)
return mftb() - tstamp;
#define mulhwu(x,y) \
({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
#ifdef CONFIG_PPC64
#define mulhdu(x,y) \
({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
extern u64 mulhdu(u64, u64);
extern void div128_by_32(u64 dividend_high, u64 dividend_low,
unsigned divisor, struct div_result *dr);
extern void secondary_cpu_time_init(void);
extern void __init time_init(void);
#ifdef CONFIG_PPC64
static inline unsigned long test_irq_work_pending(void)
unsigned long x;
asm volatile("lbz %0,%1(13)"
: "=r" (x)
: "i" (offsetof(struct paca_struct, irq_work_pending)));
return x;
DECLARE_PER_CPU(u64, decrementers_next_tb);
/* Convert timebase ticks to nanoseconds */
unsigned long long tb_to_ns(unsigned long long tb_ticks);
void timer_broadcast_interrupt(void);
/* SPLPAR */
void accumulate_stolen_time(void);
#endif /* __KERNEL__ */
#endif /* __POWERPC_TIME_H */