1/* 2 * Common time prototypes and such for all ppc machines. 3 * 4 * Written by Cort Dougan (cort@cs.nmt.edu) to merge 5 * Paul Mackerras' version and mine for PReP and Pmac. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13#ifndef __POWERPC_TIME_H 14#define __POWERPC_TIME_H 15 16#ifdef __KERNEL__ 17#include <linux/types.h> 18#include <linux/percpu.h> 19 20#include <asm/processor.h> 21#ifdef CONFIG_PPC_ISERIES 22#include <asm/paca.h> 23#include <asm/firmware.h> 24#include <asm/iseries/hv_call.h> 25#endif 26 27/* time.c */ 28extern unsigned long tb_ticks_per_jiffy; 29extern unsigned long tb_ticks_per_usec; 30extern unsigned long tb_ticks_per_sec; 31extern u64 tb_to_xs; 32extern unsigned tb_to_us; 33 34struct rtc_time; 35extern void to_tm(int tim, struct rtc_time * tm); 36extern time_t last_rtc_update; 37 38extern void generic_calibrate_decr(void); 39extern void wakeup_decrementer(void); 40extern void snapshot_timebase(void); 41 42extern void set_dec_cpu6(unsigned int val); 43 44/* Some sane defaults: 125 MHz timebase, 1GHz processor */ 45extern unsigned long ppc_proc_freq; 46#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 47extern unsigned long ppc_tb_freq; 48#define DEFAULT_TB_FREQ 125000000UL 49 50/* 51 * By putting all of this stuff into a single struct we 52 * reduce the number of cache lines touched by do_gettimeofday. 53 * Both by collecting all of the data in one cache line and 54 * by touching only one TOC entry on ppc64. 55 */ 56struct gettimeofday_vars { 57 u64 tb_to_xs; 58 u64 stamp_xsec; 59 u64 tb_orig_stamp; 60}; 61 62struct gettimeofday_struct { 63 unsigned long tb_ticks_per_sec; 64 struct gettimeofday_vars vars[2]; 65 struct gettimeofday_vars * volatile varp; 66 unsigned var_idx; 67 unsigned tb_to_us; 68}; 69 70struct div_result { 71 u64 result_high; 72 u64 result_low; 73}; 74 75/* Accessor functions for the timebase (RTC on 601) registers. */ 76/* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ 77#ifdef CONFIG_6xx 78#define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) 79#else 80#define __USE_RTC() 0 81#endif 82 83#ifdef CONFIG_PPC64 84 85/* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ 86#define get_tbl get_tb 87 88#else 89 90static inline unsigned long get_tbl(void) 91{ 92#if defined(CONFIG_403GCX) 93 unsigned long tbl; 94 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); 95 return tbl; 96#else 97 return mftbl(); 98#endif 99} 100 101static inline unsigned int get_tbu(void) 102{ 103#ifdef CONFIG_403GCX 104 unsigned int tbu; 105 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); 106 return tbu; 107#else 108 return mftbu(); 109#endif 110} 111#endif /* !CONFIG_PPC64 */ 112 113static inline unsigned int get_rtcl(void) 114{ 115 unsigned int rtcl; 116 117 asm volatile("mfrtcl %0" : "=r" (rtcl)); 118 return rtcl; 119} 120 121static inline u64 get_rtc(void) 122{ 123 unsigned int hi, lo, hi2; 124 125 do { 126 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" 127 : "=r" (hi), "=r" (lo), "=r" (hi2)); 128 } while (hi2 != hi); 129 return (u64)hi * 1000000000 + lo; 130} 131 132#ifdef CONFIG_PPC64 133static inline u64 get_tb(void) 134{ 135 return mftb(); 136} 137#else /* CONFIG_PPC64 */ 138static inline u64 get_tb(void) 139{ 140 unsigned int tbhi, tblo, tbhi2; 141 142 do { 143 tbhi = get_tbu(); 144 tblo = get_tbl(); 145 tbhi2 = get_tbu(); 146 } while (tbhi != tbhi2); 147 148 return ((u64)tbhi << 32) | tblo; 149} 150#endif /* !CONFIG_PPC64 */ 151 152static inline void set_tb(unsigned int upper, unsigned int lower) 153{ 154 mtspr(SPRN_TBWL, 0); 155 mtspr(SPRN_TBWU, upper); 156 mtspr(SPRN_TBWL, lower); 157} 158 159/* Accessor functions for the decrementer register. 160 * The 4xx doesn't even have a decrementer. I tried to use the 161 * generic timer interrupt code, which seems OK, with the 4xx PIT 162 * in auto-reload mode. The problem is PIT stops counting when it 163 * hits zero. If it would wrap, we could use it just like a decrementer. 164 */ 165static inline unsigned int get_dec(void) 166{ 167#if defined(CONFIG_40x) 168 return (mfspr(SPRN_PIT)); 169#else 170 return (mfspr(SPRN_DEC)); 171#endif 172} 173 174static inline void set_dec(int val) 175{ 176#if defined(CONFIG_40x) 177 return; /* Have to let it auto-reload */ 178#elif defined(CONFIG_8xx_CPU6) 179 set_dec_cpu6(val); 180#else 181#ifdef CONFIG_PPC_ISERIES 182 int cur_dec; 183 184 if (firmware_has_feature(FW_FEATURE_ISERIES) && 185 get_lppaca()->shared_proc) { 186 get_lppaca()->virtual_decr = val; 187 cur_dec = get_dec(); 188 if (cur_dec > val) 189 HvCall_setVirtualDecr(); 190 } else 191#endif 192 mtspr(SPRN_DEC, val); 193#endif /* not 40x or 8xx_CPU6 */ 194} 195 196static inline unsigned long tb_ticks_since(unsigned long tstamp) 197{ 198 if (__USE_RTC()) { 199 int delta = get_rtcl() - (unsigned int) tstamp; 200 return delta < 0 ? delta + 1000000000 : delta; 201 } 202 return get_tbl() - tstamp; 203} 204 205#define mulhwu(x,y) \ 206({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 207 208#ifdef CONFIG_PPC64 209#define mulhdu(x,y) \ 210({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 211#else 212extern u64 mulhdu(u64, u64); 213#endif 214 215extern void smp_space_timers(unsigned int); 216 217extern unsigned mulhwu_scale_factor(unsigned, unsigned); 218extern void div128_by_32(u64 dividend_high, u64 dividend_low, 219 unsigned divisor, struct div_result *dr); 220 221/* Used to store Processor Utilization register (purr) values */ 222 223struct cpu_usage { 224 u64 current_tb; /* Holds the current purr register values */ 225}; 226 227DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); 228 229#ifdef CONFIG_VIRT_CPU_ACCOUNTING 230extern void account_process_vtime(struct task_struct *tsk); 231#else 232#define account_process_vtime(tsk) do { } while (0) 233#endif 234 235#if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR) 236extern void calculate_steal_time(void); 237extern void snapshot_timebases(void); 238#else 239#define calculate_steal_time() do { } while (0) 240#define snapshot_timebases() do { } while (0) 241#endif 242 243#endif /* __KERNEL__ */ 244#endif /* __POWERPC_TIME_H */ 245