| /* |
| * 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 time_t last_rtc_update; |
| |
| extern void generic_calibrate_decr(void); |
| extern void wakeup_decrementer(void); |
| extern void snapshot_timebase(void); |
| |
| #ifdef CONFIG_RTC_CLASS |
| extern int __init rtc_class_hookup(void); |
| #endif |
| |
| /* 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 |
| |
| /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */ |
| static inline unsigned long get_tbl(void) |
| { |
| unsigned long tbl; |
| |
| #if defined(CONFIG_403GCX) |
| asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); |
| #else |
| asm volatile("mftb %0" : "=r" (tbl)); |
| #endif |
| return tbl; |
| } |
| |
| static inline unsigned int get_tbu(void) |
| { |
| unsigned int tbu; |
| |
| #if defined(CONFIG_403GCX) |
| asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); |
| #else |
| asm volatile("mftbu %0" : "=r" (tbu)); |
| #endif |
| return tbu; |
| } |
| |
| 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 |
| 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 |
| |
| 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 |
| } |
| |
| static inline void set_dec(int val) |
| { |
| #if defined(CONFIG_40x) |
| return; /* Have to let it auto-reload */ |
| #elif defined(CONFIG_8xx_CPU6) |
| set_dec_cpu6(val); |
| #else |
| #ifdef CONFIG_PPC_ISERIES |
| int cur_dec; |
| |
| if (firmware_has_feature(FW_FEATURE_ISERIES) && |
| get_lppaca()->shared_proc) { |
| get_lppaca()->virtual_decr = val; |
| cur_dec = get_dec(); |
| if (cur_dec > val) |
| HvCall_setVirtualDecr(); |
| } else |
| #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); |
| |
| #ifdef CONFIG_VIRT_CPU_ACCOUNTING |
| extern void account_process_vtime(struct task_struct *tsk); |
| #else |
| #define account_process_vtime(tsk) do { } while (0) |
| #endif |
| |
| #if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR) |
| extern void calculate_steal_time(void); |
| extern void snapshot_timebases(void); |
| #else |
| #define calculate_steal_time() do { } while (0) |
| #define snapshot_timebases() do { } while (0) |
| #endif |
| |
| #endif /* __KERNEL__ */ |
| #endif /* __POWERPC_TIME_H */ |