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 extern void hdec_interrupt(struct pt_regs *regs); 28 29 /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 30 extern unsigned long ppc_proc_freq; 31 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 32 extern unsigned long ppc_tb_freq; 33 #define DEFAULT_TB_FREQ 125000000UL 34 35 extern bool tb_invalid; 36 37 struct div_result { 38 u64 result_high; 39 u64 result_low; 40 }; 41 42 /* Accessor functions for the timebase (RTC on 601) registers. */ 43 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ 44 #ifdef CONFIG_PPC_BOOK3S_32 45 #define __USE_RTC() (cpu_has_feature(CPU_FTR_USE_RTC)) 46 #else 47 #define __USE_RTC() 0 48 #endif 49 50 #ifdef CONFIG_PPC64 51 52 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ 53 #define get_tbl get_tb 54 55 #else 56 57 static inline unsigned long get_tbl(void) 58 { 59 #if defined(CONFIG_403GCX) 60 unsigned long tbl; 61 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); 62 return tbl; 63 #else 64 return mftbl(); 65 #endif 66 } 67 68 static inline unsigned int get_tbu(void) 69 { 70 #ifdef CONFIG_403GCX 71 unsigned int tbu; 72 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); 73 return tbu; 74 #else 75 return mftbu(); 76 #endif 77 } 78 #endif /* !CONFIG_PPC64 */ 79 80 static inline unsigned int get_rtcl(void) 81 { 82 unsigned int rtcl; 83 84 asm volatile("mfrtcl %0" : "=r" (rtcl)); 85 return rtcl; 86 } 87 88 static inline u64 get_rtc(void) 89 { 90 unsigned int hi, lo, hi2; 91 92 do { 93 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" 94 : "=r" (hi), "=r" (lo), "=r" (hi2)); 95 } while (hi2 != hi); 96 return (u64)hi * 1000000000 + lo; 97 } 98 99 static inline u64 get_vtb(void) 100 { 101 #ifdef CONFIG_PPC_BOOK3S_64 102 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 103 return mfspr(SPRN_VTB); 104 #endif 105 return 0; 106 } 107 108 #ifdef CONFIG_PPC64 109 static inline u64 get_tb(void) 110 { 111 return mftb(); 112 } 113 #else /* CONFIG_PPC64 */ 114 static inline u64 get_tb(void) 115 { 116 unsigned int tbhi, tblo, tbhi2; 117 118 do { 119 tbhi = get_tbu(); 120 tblo = get_tbl(); 121 tbhi2 = get_tbu(); 122 } while (tbhi != tbhi2); 123 124 return ((u64)tbhi << 32) | tblo; 125 } 126 #endif /* !CONFIG_PPC64 */ 127 128 static inline u64 get_tb_or_rtc(void) 129 { 130 return __USE_RTC() ? get_rtc() : get_tb(); 131 } 132 133 static inline void set_tb(unsigned int upper, unsigned int lower) 134 { 135 mtspr(SPRN_TBWL, 0); 136 mtspr(SPRN_TBWU, upper); 137 mtspr(SPRN_TBWL, lower); 138 } 139 140 /* Accessor functions for the decrementer register. 141 * The 4xx doesn't even have a decrementer. I tried to use the 142 * generic timer interrupt code, which seems OK, with the 4xx PIT 143 * in auto-reload mode. The problem is PIT stops counting when it 144 * hits zero. If it would wrap, we could use it just like a decrementer. 145 */ 146 static inline u64 get_dec(void) 147 { 148 #if defined(CONFIG_40x) 149 return (mfspr(SPRN_PIT)); 150 #else 151 return (mfspr(SPRN_DEC)); 152 #endif 153 } 154 155 /* 156 * Note: Book E and 4xx processors differ from other PowerPC processors 157 * in when the decrementer generates its interrupt: on the 1 to 0 158 * transition for Book E/4xx, but on the 0 to -1 transition for others. 159 */ 160 static inline void set_dec(u64 val) 161 { 162 #if defined(CONFIG_40x) 163 mtspr(SPRN_PIT, (u32) val); 164 #else 165 #ifndef CONFIG_BOOKE 166 --val; 167 #endif 168 mtspr(SPRN_DEC, val); 169 #endif /* not 40x */ 170 } 171 172 static inline unsigned long tb_ticks_since(unsigned long tstamp) 173 { 174 if (__USE_RTC()) { 175 int delta = get_rtcl() - (unsigned int) tstamp; 176 return delta < 0 ? delta + 1000000000 : delta; 177 } 178 return get_tbl() - tstamp; 179 } 180 181 #define mulhwu(x,y) \ 182 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 183 184 #ifdef CONFIG_PPC64 185 #define mulhdu(x,y) \ 186 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 187 #else 188 extern u64 mulhdu(u64, u64); 189 #endif 190 191 extern void div128_by_32(u64 dividend_high, u64 dividend_low, 192 unsigned divisor, struct div_result *dr); 193 194 extern void secondary_cpu_time_init(void); 195 extern void __init time_init(void); 196 197 DECLARE_PER_CPU(u64, decrementers_next_tb); 198 199 /* Convert timebase ticks to nanoseconds */ 200 unsigned long long tb_to_ns(unsigned long long tb_ticks); 201 202 #endif /* __KERNEL__ */ 203 #endif /* __POWERPC_TIME_H */ 204