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 #include <asm/cpu_has_feature.h> 22 23 /* time.c */ 24 extern unsigned long tb_ticks_per_jiffy; 25 extern unsigned long tb_ticks_per_usec; 26 extern unsigned long tb_ticks_per_sec; 27 extern struct clock_event_device decrementer_clockevent; 28 29 30 extern void generic_calibrate_decr(void); 31 extern void hdec_interrupt(struct pt_regs *regs); 32 33 /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 34 extern unsigned long ppc_proc_freq; 35 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 36 extern unsigned long ppc_tb_freq; 37 #define DEFAULT_TB_FREQ 125000000UL 38 39 extern bool tb_invalid; 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_PPC_BOOK3S_32 49 #define __USE_RTC() (cpu_has_feature(CPU_FTR_USE_RTC)) 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 static inline u64 get_vtb(void) 104 { 105 #ifdef CONFIG_PPC_BOOK3S_64 106 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 107 return mfspr(SPRN_VTB); 108 #endif 109 return 0; 110 } 111 112 #ifdef CONFIG_PPC64 113 static inline u64 get_tb(void) 114 { 115 return mftb(); 116 } 117 #else /* CONFIG_PPC64 */ 118 static inline u64 get_tb(void) 119 { 120 unsigned int tbhi, tblo, tbhi2; 121 122 do { 123 tbhi = get_tbu(); 124 tblo = get_tbl(); 125 tbhi2 = get_tbu(); 126 } while (tbhi != tbhi2); 127 128 return ((u64)tbhi << 32) | tblo; 129 } 130 #endif /* !CONFIG_PPC64 */ 131 132 static inline u64 get_tb_or_rtc(void) 133 { 134 return __USE_RTC() ? get_rtc() : get_tb(); 135 } 136 137 static inline void set_tb(unsigned int upper, unsigned int lower) 138 { 139 mtspr(SPRN_TBWL, 0); 140 mtspr(SPRN_TBWU, upper); 141 mtspr(SPRN_TBWL, lower); 142 } 143 144 /* Accessor functions for the decrementer register. 145 * The 4xx doesn't even have a decrementer. I tried to use the 146 * generic timer interrupt code, which seems OK, with the 4xx PIT 147 * in auto-reload mode. The problem is PIT stops counting when it 148 * hits zero. If it would wrap, we could use it just like a decrementer. 149 */ 150 static inline u64 get_dec(void) 151 { 152 #if defined(CONFIG_40x) 153 return (mfspr(SPRN_PIT)); 154 #else 155 return (mfspr(SPRN_DEC)); 156 #endif 157 } 158 159 /* 160 * Note: Book E and 4xx processors differ from other PowerPC processors 161 * in when the decrementer generates its interrupt: on the 1 to 0 162 * transition for Book E/4xx, but on the 0 to -1 transition for others. 163 */ 164 static inline void set_dec(u64 val) 165 { 166 #if defined(CONFIG_40x) 167 mtspr(SPRN_PIT, (u32) val); 168 #else 169 #ifndef CONFIG_BOOKE 170 --val; 171 #endif 172 mtspr(SPRN_DEC, val); 173 #endif /* not 40x */ 174 } 175 176 static inline unsigned long tb_ticks_since(unsigned long tstamp) 177 { 178 if (__USE_RTC()) { 179 int delta = get_rtcl() - (unsigned int) tstamp; 180 return delta < 0 ? delta + 1000000000 : delta; 181 } 182 return get_tbl() - tstamp; 183 } 184 185 #define mulhwu(x,y) \ 186 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 187 188 #ifdef CONFIG_PPC64 189 #define mulhdu(x,y) \ 190 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 191 #else 192 extern u64 mulhdu(u64, u64); 193 #endif 194 195 extern void div128_by_32(u64 dividend_high, u64 dividend_low, 196 unsigned divisor, struct div_result *dr); 197 198 extern void secondary_cpu_time_init(void); 199 extern void __init time_init(void); 200 201 DECLARE_PER_CPU(u64, decrementers_next_tb); 202 203 /* Convert timebase ticks to nanoseconds */ 204 unsigned long long tb_to_ns(unsigned long long tb_ticks); 205 206 #endif /* __KERNEL__ */ 207 #endif /* __POWERPC_TIME_H */ 208