1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Common time prototypes and such for all ppc machines. 4 * 5 * Written by Cort Dougan (cort@cs.nmt.edu) to merge 6 * Paul Mackerras' version and mine for PReP and Pmac. 7 */ 8 9 #ifndef __POWERPC_TIME_H 10 #define __POWERPC_TIME_H 11 12 #ifdef __KERNEL__ 13 #include <linux/types.h> 14 #include <linux/percpu.h> 15 16 #include <asm/processor.h> 17 #include <asm/cpu_has_feature.h> 18 19 /* time.c */ 20 extern unsigned long tb_ticks_per_jiffy; 21 extern unsigned long tb_ticks_per_usec; 22 extern unsigned long tb_ticks_per_sec; 23 extern struct clock_event_device decrementer_clockevent; 24 25 26 extern void generic_calibrate_decr(void); 27 28 /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 29 extern unsigned long ppc_proc_freq; 30 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 31 extern unsigned long ppc_tb_freq; 32 #define DEFAULT_TB_FREQ 125000000UL 33 34 extern bool tb_invalid; 35 36 struct div_result { 37 u64 result_high; 38 u64 result_low; 39 }; 40 41 /* Accessor functions for the timebase (RTC on 601) registers. */ 42 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ 43 #define __USE_RTC() (IS_ENABLED(CONFIG_PPC_BOOK3S_601)) 44 45 #ifdef CONFIG_PPC64 46 47 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ 48 #define get_tbl get_tb 49 50 #else 51 52 static inline unsigned long get_tbl(void) 53 { 54 #if defined(CONFIG_403GCX) 55 unsigned long tbl; 56 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); 57 return tbl; 58 #else 59 return mftbl(); 60 #endif 61 } 62 63 static inline unsigned int get_tbu(void) 64 { 65 #ifdef CONFIG_403GCX 66 unsigned int tbu; 67 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); 68 return tbu; 69 #else 70 return mftbu(); 71 #endif 72 } 73 #endif /* !CONFIG_PPC64 */ 74 75 static inline unsigned int get_rtcl(void) 76 { 77 unsigned int rtcl; 78 79 asm volatile("mfrtcl %0" : "=r" (rtcl)); 80 return rtcl; 81 } 82 83 static inline u64 get_rtc(void) 84 { 85 unsigned int hi, lo, hi2; 86 87 do { 88 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" 89 : "=r" (hi), "=r" (lo), "=r" (hi2)); 90 } while (hi2 != hi); 91 return (u64)hi * 1000000000 + lo; 92 } 93 94 static inline u64 get_vtb(void) 95 { 96 #ifdef CONFIG_PPC_BOOK3S_64 97 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 98 return mfspr(SPRN_VTB); 99 #endif 100 return 0; 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 u64 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(u64 val) 156 { 157 #if defined(CONFIG_40x) 158 mtspr(SPRN_PIT, (u32) val); 159 #else 160 #ifndef CONFIG_BOOKE 161 --val; 162 #endif 163 mtspr(SPRN_DEC, val); 164 #endif /* not 40x */ 165 } 166 167 static inline unsigned long tb_ticks_since(unsigned long tstamp) 168 { 169 if (__USE_RTC()) { 170 int delta = get_rtcl() - (unsigned int) tstamp; 171 return delta < 0 ? delta + 1000000000 : delta; 172 } 173 return get_tbl() - tstamp; 174 } 175 176 #define mulhwu(x,y) \ 177 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 178 179 #ifdef CONFIG_PPC64 180 #define mulhdu(x,y) \ 181 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 182 #else 183 extern u64 mulhdu(u64, u64); 184 #endif 185 186 extern void div128_by_32(u64 dividend_high, u64 dividend_low, 187 unsigned divisor, struct div_result *dr); 188 189 extern void secondary_cpu_time_init(void); 190 extern void __init time_init(void); 191 192 DECLARE_PER_CPU(u64, decrementers_next_tb); 193 194 /* Convert timebase ticks to nanoseconds */ 195 unsigned long long tb_to_ns(unsigned long long tb_ticks); 196 197 /* SPLPAR */ 198 void accumulate_stolen_time(void); 199 200 #endif /* __KERNEL__ */ 201 #endif /* __POWERPC_TIME_H */ 202