123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Common time prototypes and such for all ppc machines.
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*
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* Written by Cort Dougan (cort@cs.nmt.edu) to merge
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* Paul Mackerras' version and mine for PReP and Pmac.
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*/
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#ifndef __POWERPC_TIME_H
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#define __POWERPC_TIME_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/percpu.h>
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#include <asm/processor.h>
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#include <asm/cpu_has_feature.h>
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#include <asm/vdso/timebase.h>
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/* time.c */
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extern u64 decrementer_max;
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extern unsigned long tb_ticks_per_jiffy;
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extern unsigned long tb_ticks_per_usec;
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extern unsigned long tb_ticks_per_sec;
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extern struct clock_event_device decrementer_clockevent;
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extern void generic_calibrate_decr(void);
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/* Some sane defaults: 125 MHz timebase, 1GHz processor */
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extern unsigned long ppc_proc_freq;
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#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
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extern unsigned long ppc_tb_freq;
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#define DEFAULT_TB_FREQ 125000000UL
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extern bool tb_invalid;
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struct div_result {
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u64 result_high;
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u64 result_low;
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};
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static inline u64 get_vtb(void)
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{
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if (cpu_has_feature(CPU_FTR_ARCH_207S))
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return mfspr(SPRN_VTB);
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return 0;
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}
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/* Accessor functions for the decrementer register.
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* The 4xx doesn't even have a decrementer. I tried to use the
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* generic timer interrupt code, which seems OK, with the 4xx PIT
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* in auto-reload mode. The problem is PIT stops counting when it
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* hits zero. If it would wrap, we could use it just like a decrementer.
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*/
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static inline u64 get_dec(void)
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{
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if (IS_ENABLED(CONFIG_40x))
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return mfspr(SPRN_PIT);
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return mfspr(SPRN_DEC);
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}
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/*
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* Note: Book E and 4xx processors differ from other PowerPC processors
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* in when the decrementer generates its interrupt: on the 1 to 0
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* transition for Book E/4xx, but on the 0 to -1 transition for others.
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*/
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static inline void set_dec(u64 val)
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{
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if (IS_ENABLED(CONFIG_40x))
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mtspr(SPRN_PIT, (u32)val);
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else if (IS_ENABLED(CONFIG_BOOKE))
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mtspr(SPRN_DEC, val);
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else
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mtspr(SPRN_DEC, val - 1);
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}
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static inline unsigned long tb_ticks_since(unsigned long tstamp)
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{
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return mftb() - tstamp;
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}
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#define mulhwu(x,y) \
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({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
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#ifdef CONFIG_PPC64
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#define mulhdu(x,y) \
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({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
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#else
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extern u64 mulhdu(u64, u64);
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#endif
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extern void div128_by_32(u64 dividend_high, u64 dividend_low,
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unsigned divisor, struct div_result *dr);
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extern void secondary_cpu_time_init(void);
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extern void __init time_init(void);
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DECLARE_PER_CPU(u64, decrementers_next_tb);
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static inline u64 timer_get_next_tb(void)
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{
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return __this_cpu_read(decrementers_next_tb);
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}
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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void timer_rearm_host_dec(u64 now);
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#endif
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/* Convert timebase ticks to nanoseconds */
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unsigned long long tb_to_ns(unsigned long long tb_ticks);
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void timer_broadcast_interrupt(void);
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/* SPLPAR */
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void accumulate_stolen_time(void);
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#endif /* __KERNEL__ */
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#endif /* __POWERPC_TIME_H */
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