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111 lines
2.7 KiB
111 lines
2.7 KiB
/* 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 ([email protected]) 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 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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/* 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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