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 extern u64 decrementer_max; 28 29 30 extern void generic_calibrate_decr(void); 31 32 #ifdef CONFIG_PPC_SPLPAR 33 extern u64 get_boot_tb(void); 34 #endif 35 36 /* Some sane defaults: 125 MHz timebase, 1GHz processor */ 37 extern unsigned long ppc_proc_freq; 38 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) 39 extern unsigned long ppc_tb_freq; 40 #define DEFAULT_TB_FREQ 125000000UL 41 42 extern bool tb_invalid; 43 44 struct div_result { 45 u64 result_high; 46 u64 result_low; 47 }; 48 49 static inline u64 get_vtb(void) 50 { 51 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 52 return mfspr(SPRN_VTB); 53 54 return 0; 55 } 56 57 /* Accessor functions for the decrementer register. 58 * The 4xx doesn't even have a decrementer. I tried to use the 59 * generic timer interrupt code, which seems OK, with the 4xx PIT 60 * in auto-reload mode. The problem is PIT stops counting when it 61 * hits zero. If it would wrap, we could use it just like a decrementer. 62 */ 63 static inline u64 get_dec(void) 64 { 65 return mfspr(SPRN_DEC); 66 } 67 68 /* 69 * Note: Book E and 4xx processors differ from other PowerPC processors 70 * in when the decrementer generates its interrupt: on the 1 to 0 71 * transition for Book E/4xx, but on the 0 to -1 transition for others. 72 */ 73 static inline void set_dec(u64 val) 74 { 75 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 #define mulhdu(x, y) mul_u64_u64_shr(x, y, 64) 94 #endif 95 96 extern void secondary_cpu_time_init(void); 97 extern void __init time_init(void); 98 99 DECLARE_PER_CPU(u64, decrementers_next_tb); 100 101 static inline u64 timer_get_next_tb(void) 102 { 103 return __this_cpu_read(decrementers_next_tb); 104 } 105 106 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 107 void timer_rearm_host_dec(u64 now); 108 #endif 109 110 /* Convert timebase ticks to nanoseconds */ 111 unsigned long long tb_to_ns(unsigned long long tb_ticks); 112 113 void timer_broadcast_interrupt(void); 114 115 /* SPLPAR and VIRT_CPU_ACCOUNTING_NATIVE */ 116 void pseries_accumulate_stolen_time(void); 117 u64 pseries_calculate_stolen_time(u64 stop_tb); 118 119 #endif /* __KERNEL__ */ 120 #endif /* __POWERPC_TIME_H */ 121