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 #include <asm/vdso/timebase.h> 19 20 /* time.c */ 21 extern u64 decrementer_max; 22 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 extern struct clock_event_device decrementer_clockevent; 27 28 29 extern void generic_calibrate_decr(void); 30 31 /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 32 extern unsigned long ppc_proc_freq; 33 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 34 extern unsigned long ppc_tb_freq; 35 #define DEFAULT_TB_FREQ 125000000UL 36 37 extern bool tb_invalid; 38 39 struct div_result { 40 u64 result_high; 41 u64 result_low; 42 }; 43 44 static inline u64 get_vtb(void) 45 { 46 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 47 return mfspr(SPRN_VTB); 48 49 return 0; 50 } 51 52 /* Accessor functions for the decrementer register. 53 * The 4xx doesn't even have a decrementer. I tried to use the 54 * generic timer interrupt code, which seems OK, with the 4xx PIT 55 * in auto-reload mode. The problem is PIT stops counting when it 56 * hits zero. If it would wrap, we could use it just like a decrementer. 57 */ 58 static inline u64 get_dec(void) 59 { 60 if (IS_ENABLED(CONFIG_40x)) 61 return mfspr(SPRN_PIT); 62 63 return mfspr(SPRN_DEC); 64 } 65 66 /* 67 * Note: Book E and 4xx processors differ from other PowerPC processors 68 * in when the decrementer generates its interrupt: on the 1 to 0 69 * transition for Book E/4xx, but on the 0 to -1 transition for others. 70 */ 71 static inline void set_dec(u64 val) 72 { 73 if (IS_ENABLED(CONFIG_40x)) 74 mtspr(SPRN_PIT, (u32)val); 75 else if (IS_ENABLED(CONFIG_BOOKE)) 76 mtspr(SPRN_DEC, val); 77 else 78 mtspr(SPRN_DEC, val - 1); 79 } 80 81 static inline unsigned long tb_ticks_since(unsigned long tstamp) 82 { 83 return mftb() - tstamp; 84 } 85 86 #define mulhwu(x,y) \ 87 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 88 89 #ifdef CONFIG_PPC64 90 #define mulhdu(x,y) \ 91 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) 92 #else 93 extern u64 mulhdu(u64, u64); 94 #endif 95 96 extern void div128_by_32(u64 dividend_high, u64 dividend_low, 97 unsigned divisor, struct div_result *dr); 98 99 extern void secondary_cpu_time_init(void); 100 extern void __init time_init(void); 101 102 DECLARE_PER_CPU(u64, decrementers_next_tb); 103 104 static inline u64 timer_get_next_tb(void) 105 { 106 return __this_cpu_read(decrementers_next_tb); 107 } 108 109 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 110 void timer_rearm_host_dec(u64 now); 111 #endif 112 113 /* Convert timebase ticks to nanoseconds */ 114 unsigned long long tb_to_ns(unsigned long long tb_ticks); 115 116 void timer_broadcast_interrupt(void); 117 118 /* SPLPAR */ 119 void accumulate_stolen_time(void); 120 121 #endif /* __KERNEL__ */ 122 #endif /* __POWERPC_TIME_H */ 123