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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
f2783c15 PM |
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. | |
f2783c15 PM |
7 | */ |
8 | ||
9 | #ifndef __POWERPC_TIME_H | |
10 | #define __POWERPC_TIME_H | |
11 | ||
12 | #ifdef __KERNEL__ | |
f2783c15 PM |
13 | #include <linux/types.h> |
14 | #include <linux/percpu.h> | |
15 | ||
16 | #include <asm/processor.h> | |
b92a226e | 17 | #include <asm/cpu_has_feature.h> |
d26b3817 | 18 | #include <asm/vdso/timebase.h> |
f2783c15 PM |
19 | |
20 | /* time.c */ | |
9581991a NP |
21 | extern u64 decrementer_max; |
22 | ||
f2783c15 PM |
23 | extern unsigned long tb_ticks_per_jiffy; |
24 | extern unsigned long tb_ticks_per_usec; | |
25 | extern unsigned long tb_ticks_per_sec; | |
6e35994d | 26 | extern struct clock_event_device decrementer_clockevent; |
ce0091a0 | 27 | extern u64 decrementer_max; |
f2783c15 | 28 | |
f2783c15 PM |
29 | |
30 | extern void generic_calibrate_decr(void); | |
f2783c15 PM |
31 | |
32 | /* Some sane defaults: 125 MHz timebase, 1GHz processor */ | |
33 | extern unsigned long ppc_proc_freq; | |
34 | #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) | |
35 | extern unsigned long ppc_tb_freq; | |
36 | #define DEFAULT_TB_FREQ 125000000UL | |
37 | ||
de269129 MS |
38 | extern bool tb_invalid; |
39 | ||
f2783c15 PM |
40 | struct div_result { |
41 | u64 result_high; | |
42 | u64 result_low; | |
43 | }; | |
44 | ||
8f42ab27 AK |
45 | static inline u64 get_vtb(void) |
46 | { | |
8f42ab27 | 47 | if (cpu_has_feature(CPU_FTR_ARCH_207S)) |
905259e3 | 48 | return mfspr(SPRN_VTB); |
c3cb5dbd | 49 | |
8f42ab27 AK |
50 | return 0; |
51 | } | |
52 | ||
f2783c15 PM |
53 | /* Accessor functions for the decrementer register. |
54 | * The 4xx doesn't even have a decrementer. I tried to use the | |
55 | * generic timer interrupt code, which seems OK, with the 4xx PIT | |
56 | * in auto-reload mode. The problem is PIT stops counting when it | |
57 | * hits zero. If it would wrap, we could use it just like a decrementer. | |
58 | */ | |
79901024 | 59 | static inline u64 get_dec(void) |
f2783c15 | 60 | { |
63f9d9df CL |
61 | if (IS_ENABLED(CONFIG_40x)) |
62 | return mfspr(SPRN_PIT); | |
63 | ||
64 | return mfspr(SPRN_DEC); | |
f2783c15 PM |
65 | } |
66 | ||
43875cc0 PM |
67 | /* |
68 | * Note: Book E and 4xx processors differ from other PowerPC processors | |
69 | * in when the decrementer generates its interrupt: on the 1 to 0 | |
70 | * transition for Book E/4xx, but on the 0 to -1 transition for others. | |
71 | */ | |
79901024 | 72 | static inline void set_dec(u64 val) |
f2783c15 | 73 | { |
63f9d9df CL |
74 | if (IS_ENABLED(CONFIG_40x)) |
75 | mtspr(SPRN_PIT, (u32)val); | |
76 | else if (IS_ENABLED(CONFIG_BOOKE)) | |
77 | mtspr(SPRN_DEC, val); | |
78 | else | |
79 | mtspr(SPRN_DEC, val - 1); | |
f2783c15 PM |
80 | } |
81 | ||
82 | static inline unsigned long tb_ticks_since(unsigned long tstamp) | |
83 | { | |
942e8911 | 84 | return mftb() - tstamp; |
f2783c15 PM |
85 | } |
86 | ||
87 | #define mulhwu(x,y) \ | |
88 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
89 | ||
90 | #ifdef CONFIG_PPC64 | |
91 | #define mulhdu(x,y) \ | |
92 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
93 | #else | |
94 | extern u64 mulhdu(u64, u64); | |
95 | #endif | |
96 | ||
a5b518ed PM |
97 | extern void div128_by_32(u64 dividend_high, u64 dividend_low, |
98 | unsigned divisor, struct div_result *dr); | |
f2783c15 | 99 | |
d831d0b8 | 100 | extern void secondary_cpu_time_init(void); |
848092fa | 101 | extern void __init time_init(void); |
71712b45 | 102 | |
7df10275 | 103 | DECLARE_PER_CPU(u64, decrementers_next_tb); |
37fb9a02 | 104 | |
4ebbd075 NP |
105 | static inline u64 timer_get_next_tb(void) |
106 | { | |
107 | return __this_cpu_read(decrementers_next_tb); | |
108 | } | |
109 | ||
25aa1458 NP |
110 | #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE |
111 | void timer_rearm_host_dec(u64 now); | |
112 | #endif | |
113 | ||
b6c295df PM |
114 | /* Convert timebase ticks to nanoseconds */ |
115 | unsigned long long tb_to_ns(unsigned long long tb_ticks); | |
116 | ||
0440b8a2 NP |
117 | void timer_broadcast_interrupt(void); |
118 | ||
6ba5aa54 NP |
119 | /* SPLPAR and VIRT_CPU_ACCOUNTING_NATIVE */ |
120 | void pseries_accumulate_stolen_time(void); | |
121 | u64 pseries_calculate_stolen_time(u64 stop_tb); | |
68b34588 | 122 | |
f2783c15 | 123 | #endif /* __KERNEL__ */ |
7a69af63 | 124 | #endif /* __POWERPC_TIME_H */ |