1b8b572e1SStephen Rothwell /* 2b8b572e1SStephen Rothwell * Common time prototypes and such for all ppc machines. 3b8b572e1SStephen Rothwell * 4b8b572e1SStephen Rothwell * Written by Cort Dougan (cort@cs.nmt.edu) to merge 5b8b572e1SStephen Rothwell * Paul Mackerras' version and mine for PReP and Pmac. 6b8b572e1SStephen Rothwell * 7b8b572e1SStephen Rothwell * This program is free software; you can redistribute it and/or 8b8b572e1SStephen Rothwell * modify it under the terms of the GNU General Public License 9b8b572e1SStephen Rothwell * as published by the Free Software Foundation; either version 10b8b572e1SStephen Rothwell * 2 of the License, or (at your option) any later version. 11b8b572e1SStephen Rothwell */ 12b8b572e1SStephen Rothwell 13b8b572e1SStephen Rothwell #ifndef __POWERPC_TIME_H 14b8b572e1SStephen Rothwell #define __POWERPC_TIME_H 15b8b572e1SStephen Rothwell 16b8b572e1SStephen Rothwell #ifdef __KERNEL__ 17b8b572e1SStephen Rothwell #include <linux/types.h> 18b8b572e1SStephen Rothwell #include <linux/percpu.h> 19b8b572e1SStephen Rothwell 20b8b572e1SStephen Rothwell #include <asm/processor.h> 21b8b572e1SStephen Rothwell 22b8b572e1SStephen Rothwell /* time.c */ 23b8b572e1SStephen Rothwell extern unsigned long tb_ticks_per_jiffy; 24b8b572e1SStephen Rothwell extern unsigned long tb_ticks_per_usec; 25b8b572e1SStephen Rothwell extern unsigned long tb_ticks_per_sec; 266e35994dSBharat Bhushan extern struct clock_event_device decrementer_clockevent; 27b8b572e1SStephen Rothwell 28b8b572e1SStephen Rothwell struct rtc_time; 29b8b572e1SStephen Rothwell extern void to_tm(int tim, struct rtc_time * tm); 30b8b572e1SStephen Rothwell extern void GregorianDay(struct rtc_time *tm); 311b67bee1SSrivatsa S. Bhat extern void tick_broadcast_ipi_handler(void); 32b8b572e1SStephen Rothwell 33b8b572e1SStephen Rothwell extern void generic_calibrate_decr(void); 34b8b572e1SStephen Rothwell 35b8b572e1SStephen Rothwell extern void set_dec_cpu6(unsigned int val); 36b8b572e1SStephen Rothwell 37b8b572e1SStephen Rothwell /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 38b8b572e1SStephen Rothwell extern unsigned long ppc_proc_freq; 39b8b572e1SStephen Rothwell #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 40b8b572e1SStephen Rothwell extern unsigned long ppc_tb_freq; 41b8b572e1SStephen Rothwell #define DEFAULT_TB_FREQ 125000000UL 42b8b572e1SStephen Rothwell 43b8b572e1SStephen Rothwell struct div_result { 44b8b572e1SStephen Rothwell u64 result_high; 45b8b572e1SStephen Rothwell u64 result_low; 46b8b572e1SStephen Rothwell }; 47b8b572e1SStephen Rothwell 48b8b572e1SStephen Rothwell /* Accessor functions for the timebase (RTC on 601) registers. */ 49b8b572e1SStephen Rothwell /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ 50b8b572e1SStephen Rothwell #ifdef CONFIG_6xx 51b8b572e1SStephen Rothwell #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) 52b8b572e1SStephen Rothwell #else 53b8b572e1SStephen Rothwell #define __USE_RTC() 0 54b8b572e1SStephen Rothwell #endif 55b8b572e1SStephen Rothwell 56b8b572e1SStephen Rothwell #ifdef CONFIG_PPC64 57b8b572e1SStephen Rothwell 58b8b572e1SStephen Rothwell /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ 59b8b572e1SStephen Rothwell #define get_tbl get_tb 60b8b572e1SStephen Rothwell 61b8b572e1SStephen Rothwell #else 62b8b572e1SStephen Rothwell 63b8b572e1SStephen Rothwell static inline unsigned long get_tbl(void) 64b8b572e1SStephen Rothwell { 65b8b572e1SStephen Rothwell #if defined(CONFIG_403GCX) 66b8b572e1SStephen Rothwell unsigned long tbl; 67b8b572e1SStephen Rothwell asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); 68b8b572e1SStephen Rothwell return tbl; 69b8b572e1SStephen Rothwell #else 70b8b572e1SStephen Rothwell return mftbl(); 71b8b572e1SStephen Rothwell #endif 72b8b572e1SStephen Rothwell } 73b8b572e1SStephen Rothwell 74b8b572e1SStephen Rothwell static inline unsigned int get_tbu(void) 75b8b572e1SStephen Rothwell { 76b8b572e1SStephen Rothwell #ifdef CONFIG_403GCX 77b8b572e1SStephen Rothwell unsigned int tbu; 78b8b572e1SStephen Rothwell asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); 79b8b572e1SStephen Rothwell return tbu; 80b8b572e1SStephen Rothwell #else 81b8b572e1SStephen Rothwell return mftbu(); 82b8b572e1SStephen Rothwell #endif 83b8b572e1SStephen Rothwell } 84b8b572e1SStephen Rothwell #endif /* !CONFIG_PPC64 */ 85b8b572e1SStephen Rothwell 86b8b572e1SStephen Rothwell static inline unsigned int get_rtcl(void) 87b8b572e1SStephen Rothwell { 88b8b572e1SStephen Rothwell unsigned int rtcl; 89b8b572e1SStephen Rothwell 90b8b572e1SStephen Rothwell asm volatile("mfrtcl %0" : "=r" (rtcl)); 91b8b572e1SStephen Rothwell return rtcl; 92b8b572e1SStephen Rothwell } 93b8b572e1SStephen Rothwell 94b8b572e1SStephen Rothwell static inline u64 get_rtc(void) 95b8b572e1SStephen Rothwell { 96b8b572e1SStephen Rothwell unsigned int hi, lo, hi2; 97b8b572e1SStephen Rothwell 98b8b572e1SStephen Rothwell do { 99b8b572e1SStephen Rothwell asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" 100b8b572e1SStephen Rothwell : "=r" (hi), "=r" (lo), "=r" (hi2)); 101b8b572e1SStephen Rothwell } while (hi2 != hi); 102b8b572e1SStephen Rothwell return (u64)hi * 1000000000 + lo; 103b8b572e1SStephen Rothwell } 104b8b572e1SStephen Rothwell 1058f42ab27SAneesh Kumar K.V static inline u64 get_vtb(void) 1068f42ab27SAneesh Kumar K.V { 1078f42ab27SAneesh Kumar K.V #ifdef CONFIG_PPC_BOOK3S_64 1088f42ab27SAneesh Kumar K.V if (cpu_has_feature(CPU_FTR_ARCH_207S)) 1098f42ab27SAneesh Kumar K.V return mfvtb(); 1108f42ab27SAneesh Kumar K.V #endif 1118f42ab27SAneesh Kumar K.V return 0; 1128f42ab27SAneesh Kumar K.V } 1138f42ab27SAneesh Kumar K.V 114b8b572e1SStephen Rothwell #ifdef CONFIG_PPC64 115b8b572e1SStephen Rothwell static inline u64 get_tb(void) 116b8b572e1SStephen Rothwell { 117b8b572e1SStephen Rothwell return mftb(); 118b8b572e1SStephen Rothwell } 119b8b572e1SStephen Rothwell #else /* CONFIG_PPC64 */ 120b8b572e1SStephen Rothwell static inline u64 get_tb(void) 121b8b572e1SStephen Rothwell { 122b8b572e1SStephen Rothwell unsigned int tbhi, tblo, tbhi2; 123b8b572e1SStephen Rothwell 124b8b572e1SStephen Rothwell do { 125b8b572e1SStephen Rothwell tbhi = get_tbu(); 126b8b572e1SStephen Rothwell tblo = get_tbl(); 127b8b572e1SStephen Rothwell tbhi2 = get_tbu(); 128b8b572e1SStephen Rothwell } while (tbhi != tbhi2); 129b8b572e1SStephen Rothwell 130b8b572e1SStephen Rothwell return ((u64)tbhi << 32) | tblo; 131b8b572e1SStephen Rothwell } 132b8b572e1SStephen Rothwell #endif /* !CONFIG_PPC64 */ 133b8b572e1SStephen Rothwell 134b8b572e1SStephen Rothwell static inline u64 get_tb_or_rtc(void) 135b8b572e1SStephen Rothwell { 136b8b572e1SStephen Rothwell return __USE_RTC() ? get_rtc() : get_tb(); 137b8b572e1SStephen Rothwell } 138b8b572e1SStephen Rothwell 139b8b572e1SStephen Rothwell static inline void set_tb(unsigned int upper, unsigned int lower) 140b8b572e1SStephen Rothwell { 141b8b572e1SStephen Rothwell mtspr(SPRN_TBWL, 0); 142b8b572e1SStephen Rothwell mtspr(SPRN_TBWU, upper); 143b8b572e1SStephen Rothwell mtspr(SPRN_TBWL, lower); 144b8b572e1SStephen Rothwell } 145b8b572e1SStephen Rothwell 146b8b572e1SStephen Rothwell /* Accessor functions for the decrementer register. 147b8b572e1SStephen Rothwell * The 4xx doesn't even have a decrementer. I tried to use the 148b8b572e1SStephen Rothwell * generic timer interrupt code, which seems OK, with the 4xx PIT 149b8b572e1SStephen Rothwell * in auto-reload mode. The problem is PIT stops counting when it 150b8b572e1SStephen Rothwell * hits zero. If it would wrap, we could use it just like a decrementer. 151b8b572e1SStephen Rothwell */ 152b8b572e1SStephen Rothwell static inline unsigned int get_dec(void) 153b8b572e1SStephen Rothwell { 154b8b572e1SStephen Rothwell #if defined(CONFIG_40x) 155b8b572e1SStephen Rothwell return (mfspr(SPRN_PIT)); 156b8b572e1SStephen Rothwell #else 157b8b572e1SStephen Rothwell return (mfspr(SPRN_DEC)); 158b8b572e1SStephen Rothwell #endif 159b8b572e1SStephen Rothwell } 160b8b572e1SStephen Rothwell 161b8b572e1SStephen Rothwell /* 162b8b572e1SStephen Rothwell * Note: Book E and 4xx processors differ from other PowerPC processors 163b8b572e1SStephen Rothwell * in when the decrementer generates its interrupt: on the 1 to 0 164b8b572e1SStephen Rothwell * transition for Book E/4xx, but on the 0 to -1 transition for others. 165b8b572e1SStephen Rothwell */ 166b8b572e1SStephen Rothwell static inline void set_dec(int val) 167b8b572e1SStephen Rothwell { 168b8b572e1SStephen Rothwell #if defined(CONFIG_40x) 169b8b572e1SStephen Rothwell mtspr(SPRN_PIT, val); 170b8b572e1SStephen Rothwell #elif defined(CONFIG_8xx_CPU6) 171b8b572e1SStephen Rothwell set_dec_cpu6(val - 1); 172b8b572e1SStephen Rothwell #else 173b8b572e1SStephen Rothwell #ifndef CONFIG_BOOKE 174b8b572e1SStephen Rothwell --val; 175b8b572e1SStephen Rothwell #endif 176b8b572e1SStephen Rothwell mtspr(SPRN_DEC, val); 177b8b572e1SStephen Rothwell #endif /* not 40x or 8xx_CPU6 */ 178b8b572e1SStephen Rothwell } 179b8b572e1SStephen Rothwell 180b8b572e1SStephen Rothwell static inline unsigned long tb_ticks_since(unsigned long tstamp) 181b8b572e1SStephen Rothwell { 182b8b572e1SStephen Rothwell if (__USE_RTC()) { 183b8b572e1SStephen Rothwell int delta = get_rtcl() - (unsigned int) tstamp; 184b8b572e1SStephen Rothwell return delta < 0 ? delta + 1000000000 : delta; 185b8b572e1SStephen Rothwell } 186b8b572e1SStephen Rothwell return get_tbl() - tstamp; 187b8b572e1SStephen Rothwell } 188b8b572e1SStephen Rothwell 189b8b572e1SStephen Rothwell #define mulhwu(x,y) \ 190b8b572e1SStephen Rothwell ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 191b8b572e1SStephen Rothwell 192b8b572e1SStephen Rothwell #ifdef CONFIG_PPC64 193b8b572e1SStephen Rothwell #define mulhdu(x,y) \ 194b8b572e1SStephen Rothwell ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 195b8b572e1SStephen Rothwell #else 196b8b572e1SStephen Rothwell extern u64 mulhdu(u64, u64); 197b8b572e1SStephen Rothwell #endif 198b8b572e1SStephen Rothwell 199b8b572e1SStephen Rothwell extern void div128_by_32(u64 dividend_high, u64 dividend_low, 200b8b572e1SStephen Rothwell unsigned divisor, struct div_result *dr); 201b8b572e1SStephen Rothwell 202b8b572e1SStephen Rothwell /* Used to store Processor Utilization register (purr) values */ 203b8b572e1SStephen Rothwell 204b8b572e1SStephen Rothwell struct cpu_usage { 205b8b572e1SStephen Rothwell u64 current_tb; /* Holds the current purr register values */ 206b8b572e1SStephen Rothwell }; 207b8b572e1SStephen Rothwell 208b8b572e1SStephen Rothwell DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); 209b8b572e1SStephen Rothwell 210b8b572e1SStephen Rothwell extern void secondary_cpu_time_init(void); 211b8b572e1SStephen Rothwell 2127df10275SAnton Blanchard DECLARE_PER_CPU(u64, decrementers_next_tb); 21337fb9a02SAnton Blanchard 214b6c295dfSPaul Mackerras /* Convert timebase ticks to nanoseconds */ 215b6c295dfSPaul Mackerras unsigned long long tb_to_ns(unsigned long long tb_ticks); 216b6c295dfSPaul Mackerras 217b8b572e1SStephen Rothwell #endif /* __KERNEL__ */ 218b8b572e1SStephen Rothwell #endif /* __POWERPC_TIME_H */ 219