1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Common time prototypes and such for all ppc machines.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Written by Cort Dougan (cort@cs.nmt.edu) to merge
6*4882a593Smuzhiyun * Paul Mackerras' version and mine for PReP and Pmac.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifndef __POWERPC_TIME_H
10*4882a593Smuzhiyun #define __POWERPC_TIME_H
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #ifdef __KERNEL__
13*4882a593Smuzhiyun #include <linux/types.h>
14*4882a593Smuzhiyun #include <linux/percpu.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include <asm/processor.h>
17*4882a593Smuzhiyun #include <asm/cpu_has_feature.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /* time.c */
20*4882a593Smuzhiyun extern unsigned long tb_ticks_per_jiffy;
21*4882a593Smuzhiyun extern unsigned long tb_ticks_per_usec;
22*4882a593Smuzhiyun extern unsigned long tb_ticks_per_sec;
23*4882a593Smuzhiyun extern struct clock_event_device decrementer_clockevent;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun extern void generic_calibrate_decr(void);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun /* Some sane defaults: 125 MHz timebase, 1GHz processor */
29*4882a593Smuzhiyun extern unsigned long ppc_proc_freq;
30*4882a593Smuzhiyun #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
31*4882a593Smuzhiyun extern unsigned long ppc_tb_freq;
32*4882a593Smuzhiyun #define DEFAULT_TB_FREQ 125000000UL
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun extern bool tb_invalid;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun struct div_result {
37*4882a593Smuzhiyun u64 result_high;
38*4882a593Smuzhiyun u64 result_low;
39*4882a593Smuzhiyun };
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
get_tbl(void)42*4882a593Smuzhiyun static inline unsigned long get_tbl(void)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun return mftb();
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
get_vtb(void)47*4882a593Smuzhiyun static inline u64 get_vtb(void)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun #ifdef CONFIG_PPC_BOOK3S_64
50*4882a593Smuzhiyun if (cpu_has_feature(CPU_FTR_ARCH_207S))
51*4882a593Smuzhiyun return mfspr(SPRN_VTB);
52*4882a593Smuzhiyun #endif
53*4882a593Smuzhiyun return 0;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
get_tb(void)56*4882a593Smuzhiyun static inline u64 get_tb(void)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun unsigned int tbhi, tblo, tbhi2;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (IS_ENABLED(CONFIG_PPC64))
61*4882a593Smuzhiyun return mftb();
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun do {
64*4882a593Smuzhiyun tbhi = mftbu();
65*4882a593Smuzhiyun tblo = mftb();
66*4882a593Smuzhiyun tbhi2 = mftbu();
67*4882a593Smuzhiyun } while (tbhi != tbhi2);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun return ((u64)tbhi << 32) | tblo;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
set_tb(unsigned int upper,unsigned int lower)72*4882a593Smuzhiyun static inline void set_tb(unsigned int upper, unsigned int lower)
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun mtspr(SPRN_TBWL, 0);
75*4882a593Smuzhiyun mtspr(SPRN_TBWU, upper);
76*4882a593Smuzhiyun mtspr(SPRN_TBWL, lower);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun /* Accessor functions for the decrementer register.
80*4882a593Smuzhiyun * The 4xx doesn't even have a decrementer. I tried to use the
81*4882a593Smuzhiyun * generic timer interrupt code, which seems OK, with the 4xx PIT
82*4882a593Smuzhiyun * in auto-reload mode. The problem is PIT stops counting when it
83*4882a593Smuzhiyun * hits zero. If it would wrap, we could use it just like a decrementer.
84*4882a593Smuzhiyun */
get_dec(void)85*4882a593Smuzhiyun static inline u64 get_dec(void)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun if (IS_ENABLED(CONFIG_40x))
88*4882a593Smuzhiyun return mfspr(SPRN_PIT);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun return mfspr(SPRN_DEC);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun /*
94*4882a593Smuzhiyun * Note: Book E and 4xx processors differ from other PowerPC processors
95*4882a593Smuzhiyun * in when the decrementer generates its interrupt: on the 1 to 0
96*4882a593Smuzhiyun * transition for Book E/4xx, but on the 0 to -1 transition for others.
97*4882a593Smuzhiyun */
set_dec(u64 val)98*4882a593Smuzhiyun static inline void set_dec(u64 val)
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun if (IS_ENABLED(CONFIG_40x))
101*4882a593Smuzhiyun mtspr(SPRN_PIT, (u32)val);
102*4882a593Smuzhiyun else if (IS_ENABLED(CONFIG_BOOKE))
103*4882a593Smuzhiyun mtspr(SPRN_DEC, val);
104*4882a593Smuzhiyun else
105*4882a593Smuzhiyun mtspr(SPRN_DEC, val - 1);
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun
tb_ticks_since(unsigned long tstamp)108*4882a593Smuzhiyun static inline unsigned long tb_ticks_since(unsigned long tstamp)
109*4882a593Smuzhiyun {
110*4882a593Smuzhiyun return mftb() - tstamp;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun #define mulhwu(x,y) \
114*4882a593Smuzhiyun ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun #ifdef CONFIG_PPC64
117*4882a593Smuzhiyun #define mulhdu(x,y) \
118*4882a593Smuzhiyun ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
119*4882a593Smuzhiyun #else
120*4882a593Smuzhiyun extern u64 mulhdu(u64, u64);
121*4882a593Smuzhiyun #endif
122*4882a593Smuzhiyun
123*4882a593Smuzhiyun extern void div128_by_32(u64 dividend_high, u64 dividend_low,
124*4882a593Smuzhiyun unsigned divisor, struct div_result *dr);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun extern void secondary_cpu_time_init(void);
127*4882a593Smuzhiyun extern void __init time_init(void);
128*4882a593Smuzhiyun
129*4882a593Smuzhiyun DECLARE_PER_CPU(u64, decrementers_next_tb);
130*4882a593Smuzhiyun
131*4882a593Smuzhiyun /* Convert timebase ticks to nanoseconds */
132*4882a593Smuzhiyun unsigned long long tb_to_ns(unsigned long long tb_ticks);
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun /* SPLPAR */
135*4882a593Smuzhiyun void accumulate_stolen_time(void);
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun #endif /* __KERNEL__ */
138*4882a593Smuzhiyun #endif /* __POWERPC_TIME_H */
139