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 */ 28 extern unsigned long tb_ticks_per_jiffy; 29 extern unsigned long tb_ticks_per_usec; 30 extern unsigned long tb_ticks_per_sec; 31 extern u64 tb_to_xs; 32 extern unsigned tb_to_us; 33 34 struct rtc_time; 35 extern void to_tm(int tim, struct rtc_time * tm); 36 extern void GregorianDay(struct rtc_time *tm); 37 extern time_t last_rtc_update; 38 39 extern void generic_calibrate_decr(void); 40 extern void wakeup_decrementer(void); 41 extern void snapshot_timebase(void); 42 43 extern void set_dec_cpu6(unsigned int val); 44 45 /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 46 extern unsigned long ppc_proc_freq; 47 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 48 extern unsigned long ppc_tb_freq; 49 #define DEFAULT_TB_FREQ 125000000UL 50 51 struct div_result { 52 u64 result_high; 53 u64 result_low; 54 }; 55 56 /* Accessor functions for the timebase (RTC on 601) registers. */ 57 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ 58 #ifdef CONFIG_6xx 59 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) 60 #else 61 #define __USE_RTC() 0 62 #endif 63 64 #ifdef CONFIG_PPC64 65 66 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ 67 #define get_tbl get_tb 68 69 #else 70 71 static inline unsigned long get_tbl(void) 72 { 73 #if defined(CONFIG_403GCX) 74 unsigned long tbl; 75 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); 76 return tbl; 77 #else 78 return mftbl(); 79 #endif 80 } 81 82 static inline unsigned int get_tbu(void) 83 { 84 #ifdef CONFIG_403GCX 85 unsigned int tbu; 86 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); 87 return tbu; 88 #else 89 return mftbu(); 90 #endif 91 } 92 #endif /* !CONFIG_PPC64 */ 93 94 static inline unsigned int get_rtcl(void) 95 { 96 unsigned int rtcl; 97 98 asm volatile("mfrtcl %0" : "=r" (rtcl)); 99 return rtcl; 100 } 101 102 static inline u64 get_rtc(void) 103 { 104 unsigned int hi, lo, hi2; 105 106 do { 107 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" 108 : "=r" (hi), "=r" (lo), "=r" (hi2)); 109 } while (hi2 != hi); 110 return (u64)hi * 1000000000 + lo; 111 } 112 113 #ifdef CONFIG_PPC64 114 static inline u64 get_tb(void) 115 { 116 return mftb(); 117 } 118 #else /* CONFIG_PPC64 */ 119 static inline u64 get_tb(void) 120 { 121 unsigned int tbhi, tblo, tbhi2; 122 123 do { 124 tbhi = get_tbu(); 125 tblo = get_tbl(); 126 tbhi2 = get_tbu(); 127 } while (tbhi != tbhi2); 128 129 return ((u64)tbhi << 32) | tblo; 130 } 131 #endif /* !CONFIG_PPC64 */ 132 133 static inline u64 get_tb_or_rtc(void) 134 { 135 return __USE_RTC() ? get_rtc() : get_tb(); 136 } 137 138 static inline void set_tb(unsigned int upper, unsigned int lower) 139 { 140 mtspr(SPRN_TBWL, 0); 141 mtspr(SPRN_TBWU, upper); 142 mtspr(SPRN_TBWL, lower); 143 } 144 145 /* Accessor functions for the decrementer register. 146 * The 4xx doesn't even have a decrementer. I tried to use the 147 * generic timer interrupt code, which seems OK, with the 4xx PIT 148 * in auto-reload mode. The problem is PIT stops counting when it 149 * hits zero. If it would wrap, we could use it just like a decrementer. 150 */ 151 static inline unsigned int get_dec(void) 152 { 153 #if defined(CONFIG_40x) 154 return (mfspr(SPRN_PIT)); 155 #else 156 return (mfspr(SPRN_DEC)); 157 #endif 158 } 159 160 /* 161 * Note: Book E and 4xx processors differ from other PowerPC processors 162 * in when the decrementer generates its interrupt: on the 1 to 0 163 * transition for Book E/4xx, but on the 0 to -1 transition for others. 164 */ 165 static inline void set_dec(int val) 166 { 167 #if defined(CONFIG_40x) 168 mtspr(SPRN_PIT, val); 169 #elif defined(CONFIG_8xx_CPU6) 170 set_dec_cpu6(val - 1); 171 #else 172 #ifndef CONFIG_BOOKE 173 --val; 174 #endif 175 #ifdef CONFIG_PPC_ISERIES 176 if (firmware_has_feature(FW_FEATURE_ISERIES) && 177 get_lppaca()->shared_proc) { 178 get_lppaca()->virtual_decr = val; 179 if (get_dec() > val) 180 HvCall_setVirtualDecr(); 181 return; 182 } 183 #endif 184 mtspr(SPRN_DEC, val); 185 #endif /* not 40x or 8xx_CPU6 */ 186 } 187 188 static inline unsigned long tb_ticks_since(unsigned long tstamp) 189 { 190 if (__USE_RTC()) { 191 int delta = get_rtcl() - (unsigned int) tstamp; 192 return delta < 0 ? delta + 1000000000 : delta; 193 } 194 return get_tbl() - tstamp; 195 } 196 197 #define mulhwu(x,y) \ 198 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 199 200 #ifdef CONFIG_PPC64 201 #define mulhdu(x,y) \ 202 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 203 #else 204 extern u64 mulhdu(u64, u64); 205 #endif 206 207 extern void smp_space_timers(unsigned int); 208 209 extern unsigned mulhwu_scale_factor(unsigned, unsigned); 210 extern void div128_by_32(u64 dividend_high, u64 dividend_low, 211 unsigned divisor, struct div_result *dr); 212 213 /* Used to store Processor Utilization register (purr) values */ 214 215 struct cpu_usage { 216 u64 current_tb; /* Holds the current purr register values */ 217 }; 218 219 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); 220 221 #if defined(CONFIG_VIRT_CPU_ACCOUNTING) 222 extern void calculate_steal_time(void); 223 extern void snapshot_timebases(void); 224 #define account_process_vtime(tsk) account_process_tick(tsk, 0) 225 #else 226 #define calculate_steal_time() do { } while (0) 227 #define snapshot_timebases() do { } while (0) 228 #define account_process_vtime(tsk) do { } while (0) 229 #endif 230 231 extern void secondary_cpu_time_init(void); 232 extern void iSeries_time_init_early(void); 233 234 #endif /* __KERNEL__ */ 235 #endif /* __POWERPC_TIME_H */ 236