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 22 /* time.c */ 23 extern unsigned long tb_ticks_per_jiffy; 24 extern unsigned long tb_ticks_per_usec; 25 extern unsigned long tb_ticks_per_sec; 26 27 struct rtc_time; 28 extern void to_tm(int tim, struct rtc_time * tm); 29 extern void GregorianDay(struct rtc_time *tm); 30 31 extern void generic_calibrate_decr(void); 32 33 extern void set_dec_cpu6(unsigned int val); 34 35 /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 36 extern unsigned long ppc_proc_freq; 37 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 38 extern unsigned long ppc_tb_freq; 39 #define DEFAULT_TB_FREQ 125000000UL 40 41 struct div_result { 42 u64 result_high; 43 u64 result_low; 44 }; 45 46 /* Accessor functions for the timebase (RTC on 601) registers. */ 47 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ 48 #ifdef CONFIG_6xx 49 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) 50 #else 51 #define __USE_RTC() 0 52 #endif 53 54 #ifdef CONFIG_PPC64 55 56 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ 57 #define get_tbl get_tb 58 59 #else 60 61 static inline unsigned long get_tbl(void) 62 { 63 #if defined(CONFIG_403GCX) 64 unsigned long tbl; 65 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); 66 return tbl; 67 #else 68 return mftbl(); 69 #endif 70 } 71 72 static inline unsigned int get_tbu(void) 73 { 74 #ifdef CONFIG_403GCX 75 unsigned int tbu; 76 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); 77 return tbu; 78 #else 79 return mftbu(); 80 #endif 81 } 82 #endif /* !CONFIG_PPC64 */ 83 84 static inline unsigned int get_rtcl(void) 85 { 86 unsigned int rtcl; 87 88 asm volatile("mfrtcl %0" : "=r" (rtcl)); 89 return rtcl; 90 } 91 92 static inline u64 get_rtc(void) 93 { 94 unsigned int hi, lo, hi2; 95 96 do { 97 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" 98 : "=r" (hi), "=r" (lo), "=r" (hi2)); 99 } while (hi2 != hi); 100 return (u64)hi * 1000000000 + lo; 101 } 102 103 #ifdef CONFIG_PPC64 104 static inline u64 get_tb(void) 105 { 106 return mftb(); 107 } 108 #else /* CONFIG_PPC64 */ 109 static inline u64 get_tb(void) 110 { 111 unsigned int tbhi, tblo, tbhi2; 112 113 do { 114 tbhi = get_tbu(); 115 tblo = get_tbl(); 116 tbhi2 = get_tbu(); 117 } while (tbhi != tbhi2); 118 119 return ((u64)tbhi << 32) | tblo; 120 } 121 #endif /* !CONFIG_PPC64 */ 122 123 static inline u64 get_tb_or_rtc(void) 124 { 125 return __USE_RTC() ? get_rtc() : get_tb(); 126 } 127 128 static inline void set_tb(unsigned int upper, unsigned int lower) 129 { 130 mtspr(SPRN_TBWL, 0); 131 mtspr(SPRN_TBWU, upper); 132 mtspr(SPRN_TBWL, lower); 133 } 134 135 /* Accessor functions for the decrementer register. 136 * The 4xx doesn't even have a decrementer. I tried to use the 137 * generic timer interrupt code, which seems OK, with the 4xx PIT 138 * in auto-reload mode. The problem is PIT stops counting when it 139 * hits zero. If it would wrap, we could use it just like a decrementer. 140 */ 141 static inline unsigned int get_dec(void) 142 { 143 #if defined(CONFIG_40x) 144 return (mfspr(SPRN_PIT)); 145 #else 146 return (mfspr(SPRN_DEC)); 147 #endif 148 } 149 150 /* 151 * Note: Book E and 4xx processors differ from other PowerPC processors 152 * in when the decrementer generates its interrupt: on the 1 to 0 153 * transition for Book E/4xx, but on the 0 to -1 transition for others. 154 */ 155 static inline void set_dec(int val) 156 { 157 #if defined(CONFIG_40x) 158 mtspr(SPRN_PIT, val); 159 #elif defined(CONFIG_8xx_CPU6) 160 set_dec_cpu6(val - 1); 161 #else 162 #ifndef CONFIG_BOOKE 163 --val; 164 #endif 165 mtspr(SPRN_DEC, val); 166 #endif /* not 40x or 8xx_CPU6 */ 167 } 168 169 static inline unsigned long tb_ticks_since(unsigned long tstamp) 170 { 171 if (__USE_RTC()) { 172 int delta = get_rtcl() - (unsigned int) tstamp; 173 return delta < 0 ? delta + 1000000000 : delta; 174 } 175 return get_tbl() - tstamp; 176 } 177 178 #define mulhwu(x,y) \ 179 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 180 181 #ifdef CONFIG_PPC64 182 #define mulhdu(x,y) \ 183 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 184 #else 185 extern u64 mulhdu(u64, u64); 186 #endif 187 188 extern void div128_by_32(u64 dividend_high, u64 dividend_low, 189 unsigned divisor, struct div_result *dr); 190 191 /* Used to store Processor Utilization register (purr) values */ 192 193 struct cpu_usage { 194 u64 current_tb; /* Holds the current purr register values */ 195 }; 196 197 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); 198 199 #if defined(CONFIG_VIRT_CPU_ACCOUNTING) 200 #define account_process_vtime(tsk) account_process_tick(tsk, 0) 201 #else 202 #define account_process_vtime(tsk) do { } while (0) 203 #endif 204 205 extern void secondary_cpu_time_init(void); 206 207 DECLARE_PER_CPU(u64, decrementers_next_tb); 208 209 #endif /* __KERNEL__ */ 210 #endif /* __POWERPC_TIME_H */ 211