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Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/include/asm/time.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h new file mode 100644 index 000000000..2f566c1a7 --- /dev/null +++ b/arch/powerpc/include/asm/time.h @@ -0,0 +1,138 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Common time prototypes and such for all ppc machines. + * + * Written by Cort Dougan (cort@cs.nmt.edu) 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> + +/* 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; +#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) +extern unsigned long ppc_tb_freq; +#define DEFAULT_TB_FREQ 125000000UL + +extern bool tb_invalid; + +struct div_result { + u64 result_high; + u64 result_low; +}; + +/* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ +static inline unsigned long get_tbl(void) +{ + return mftb(); +} + +static inline u64 get_vtb(void) +{ +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + return mfspr(SPRN_VTB); +#endif + return 0; +} + +static inline u64 get_tb(void) +{ + unsigned int tbhi, tblo, tbhi2; + + if (IS_ENABLED(CONFIG_PPC64)) + return mftb(); + + do { + tbhi = mftbu(); + tblo = mftb(); + tbhi2 = mftbu(); + } while (tbhi != tbhi2); + + return ((u64)tbhi << 32) | tblo; +} + +static inline void set_tb(unsigned int upper, unsigned int lower) +{ + mtspr(SPRN_TBWL, 0); + mtspr(SPRN_TBWU, upper); + mtspr(SPRN_TBWL, lower); +} + +/* 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) +{ + if (IS_ENABLED(CONFIG_40x)) + 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) +{ + if (IS_ENABLED(CONFIG_40x)) + mtspr(SPRN_PIT, (u32)val); + else if (IS_ENABLED(CONFIG_BOOKE)) + mtspr(SPRN_DEC, val); + else + 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;}) +#else +extern u64 mulhdu(u64, u64); +#endif + +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); + +DECLARE_PER_CPU(u64, decrementers_next_tb); + +/* Convert timebase ticks to nanoseconds */ +unsigned long long tb_to_ns(unsigned long long tb_ticks); + +/* SPLPAR */ +void accumulate_stolen_time(void); + +#endif /* __KERNEL__ */ +#endif /* __POWERPC_TIME_H */ |