1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Common time prototypes and such for all ppc machines.
5 * Written by Cort Dougan (cort@cs.nmt.edu) to merge
6 * Paul Mackerras' version and mine for PReP and Pmac.
9 #ifndef __POWERPC_TIME_H
10 #define __POWERPC_TIME_H
13 #include <linux/types.h>
14 #include <linux/percpu.h>
16 #include <asm/processor.h>
17 #include <asm/cpu_has_feature.h>
18 #include <asm/vdso/timebase.h>
21 extern unsigned long tb_ticks_per_jiffy
;
22 extern unsigned long tb_ticks_per_usec
;
23 extern unsigned long tb_ticks_per_sec
;
24 extern struct clock_event_device decrementer_clockevent
;
27 extern void generic_calibrate_decr(void);
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
35 extern bool tb_invalid
;
42 static inline u64
get_vtb(void)
44 if (cpu_has_feature(CPU_FTR_ARCH_207S
))
45 return mfspr(SPRN_VTB
);
50 /* Accessor functions for the decrementer register.
51 * The 4xx doesn't even have a decrementer. I tried to use the
52 * generic timer interrupt code, which seems OK, with the 4xx PIT
53 * in auto-reload mode. The problem is PIT stops counting when it
54 * hits zero. If it would wrap, we could use it just like a decrementer.
56 static inline u64
get_dec(void)
58 if (IS_ENABLED(CONFIG_40x
))
59 return mfspr(SPRN_PIT
);
61 return mfspr(SPRN_DEC
);
65 * Note: Book E and 4xx processors differ from other PowerPC processors
66 * in when the decrementer generates its interrupt: on the 1 to 0
67 * transition for Book E/4xx, but on the 0 to -1 transition for others.
69 static inline void set_dec(u64 val
)
71 if (IS_ENABLED(CONFIG_40x
))
72 mtspr(SPRN_PIT
, (u32
)val
);
73 else if (IS_ENABLED(CONFIG_BOOKE
))
76 mtspr(SPRN_DEC
, val
- 1);
79 static inline unsigned long tb_ticks_since(unsigned long tstamp
)
81 return mftb() - tstamp
;
85 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
89 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
91 extern u64
mulhdu(u64
, u64
);
94 extern void div128_by_32(u64 dividend_high
, u64 dividend_low
,
95 unsigned divisor
, struct div_result
*dr
);
97 extern void secondary_cpu_time_init(void);
98 extern void __init
time_init(void);
101 static inline unsigned long test_irq_work_pending(void)
105 asm volatile("lbz %0,%1(13)"
107 : "i" (offsetof(struct paca_struct
, irq_work_pending
)));
112 DECLARE_PER_CPU(u64
, decrementers_next_tb
);
114 /* Convert timebase ticks to nanoseconds */
115 unsigned long long tb_to_ns(unsigned long long tb_ticks
);
117 void timer_broadcast_interrupt(void);
120 void accumulate_stolen_time(void);
122 #endif /* __KERNEL__ */
123 #endif /* __POWERPC_TIME_H */