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Diffstat (limited to 'arch/powerpc/include/asm/time.h')
| -rw-r--r-- | arch/powerpc/include/asm/time.h | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h new file mode 100644 index 000000000000..febd581ec9b0 --- /dev/null +++ b/arch/powerpc/include/asm/time.h @@ -0,0 +1,255 @@ +/* + * 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. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef __POWERPC_TIME_H +#define __POWERPC_TIME_H + +#ifdef __KERNEL__ +#include <linux/types.h> +#include <linux/percpu.h> + +#include <asm/processor.h> +#ifdef CONFIG_PPC_ISERIES +#include <asm/paca.h> +#include <asm/firmware.h> +#include <asm/iseries/hv_call.h> +#endif + +/* time.c */ +extern unsigned long tb_ticks_per_jiffy; +extern unsigned long tb_ticks_per_usec; +extern unsigned long tb_ticks_per_sec; +extern u64 tb_to_xs; +extern unsigned tb_to_us; + +struct rtc_time; +extern void to_tm(int tim, struct rtc_time * tm); +extern void GregorianDay(struct rtc_time *tm); +extern time_t last_rtc_update; + +extern void generic_calibrate_decr(void); +extern void wakeup_decrementer(void); +extern void snapshot_timebase(void); + +extern void set_dec_cpu6(unsigned int val); + +/* 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 + +/* + * By putting all of this stuff into a single struct we + * reduce the number of cache lines touched by do_gettimeofday. + * Both by collecting all of the data in one cache line and + * by touching only one TOC entry on ppc64. + */ +struct gettimeofday_vars { + u64 tb_to_xs; + u64 stamp_xsec; + u64 tb_orig_stamp; +}; + +struct gettimeofday_struct { + unsigned long tb_ticks_per_sec; + struct gettimeofday_vars vars[2]; + struct gettimeofday_vars * volatile varp; + unsigned var_idx; + unsigned tb_to_us; +}; + +struct div_result { + u64 result_high; + u64 result_low; +}; + +/* Accessor functions for the timebase (RTC on 601) registers. */ +/* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ +#ifdef CONFIG_6xx +#define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) +#else +#define __USE_RTC() 0 +#endif + +#ifdef CONFIG_PPC64 + +/* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ +#define get_tbl get_tb + +#else + +static inline unsigned long get_tbl(void) +{ +#if defined(CONFIG_403GCX) + unsigned long tbl; + asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); + return tbl; +#else + return mftbl(); +#endif +} + +static inline unsigned int get_tbu(void) +{ +#ifdef CONFIG_403GCX + unsigned int tbu; + asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); + return tbu; +#else + return mftbu(); +#endif +} +#endif /* !CONFIG_PPC64 */ + +static inline unsigned int get_rtcl(void) +{ + unsigned int rtcl; + + asm volatile("mfrtcl %0" : "=r" (rtcl)); + return rtcl; +} + +static inline u64 get_rtc(void) +{ + unsigned int hi, lo, hi2; + + do { + asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" + : "=r" (hi), "=r" (lo), "=r" (hi2)); + } while (hi2 != hi); + return (u64)hi * 1000000000 + lo; +} + +#ifdef CONFIG_PPC64 +static inline u64 get_tb(void) +{ + return mftb(); +} +#else /* CONFIG_PPC64 */ +static inline u64 get_tb(void) +{ + unsigned int tbhi, tblo, tbhi2; + + do { + tbhi = get_tbu(); + tblo = get_tbl(); + tbhi2 = get_tbu(); + } while (tbhi != tbhi2); + + return ((u64)tbhi << 32) | tblo; +} +#endif /* !CONFIG_PPC64 */ + +static inline u64 get_tb_or_rtc(void) +{ + return __USE_RTC() ? get_rtc() : get_tb(); +} + +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 unsigned int get_dec(void) +{ +#if defined(CONFIG_40x) + return (mfspr(SPRN_PIT)); +#else + return (mfspr(SPRN_DEC)); +#endif +} + +/* + * 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(int val) +{ +#if defined(CONFIG_40x) + mtspr(SPRN_PIT, val); +#elif defined(CONFIG_8xx_CPU6) + set_dec_cpu6(val - 1); +#else +#ifndef CONFIG_BOOKE + --val; +#endif +#ifdef CONFIG_PPC_ISERIES + if (firmware_has_feature(FW_FEATURE_ISERIES) && + get_lppaca()->shared_proc) { + get_lppaca()->virtual_decr = val; + if (get_dec() > val) + HvCall_setVirtualDecr(); + return; + } +#endif + mtspr(SPRN_DEC, val); +#endif /* not 40x or 8xx_CPU6 */ +} + +static inline unsigned long tb_ticks_since(unsigned long tstamp) +{ + if (__USE_RTC()) { + int delta = get_rtcl() - (unsigned int) tstamp; + return delta < 0 ? delta + 1000000000 : delta; + } + return get_tbl() - 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 smp_space_timers(unsigned int); + +extern unsigned mulhwu_scale_factor(unsigned, unsigned); +extern void div128_by_32(u64 dividend_high, u64 dividend_low, + unsigned divisor, struct div_result *dr); + +/* Used to store Processor Utilization register (purr) values */ + +struct cpu_usage { + u64 current_tb; /* Holds the current purr register values */ +}; + +DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); + +#if defined(CONFIG_VIRT_CPU_ACCOUNTING) +extern void calculate_steal_time(void); +extern void snapshot_timebases(void); +#define account_process_vtime(tsk) account_process_tick(tsk, 0) +#else +#define calculate_steal_time() do { } while (0) +#define snapshot_timebases() do { } while (0) +#define account_process_vtime(tsk) do { } while (0) +#endif + +extern void secondary_cpu_time_init(void); +extern void iSeries_time_init_early(void); + +#endif /* __KERNEL__ */ +#endif /* __POWERPC_TIME_H */ |