^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Common time prototypes and such for all ppc machines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by Cort Dougan (cort@cs.nmt.edu) to merge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Paul Mackerras' version and mine for PReP and Pmac.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #ifndef __POWERPC_TIME_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define __POWERPC_TIME_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #ifdef __KERNEL__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/cpu_has_feature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /* time.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) extern unsigned long tb_ticks_per_jiffy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) extern unsigned long tb_ticks_per_usec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) extern unsigned long tb_ticks_per_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) extern struct clock_event_device decrementer_clockevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) extern void generic_calibrate_decr(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* Some sane defaults: 125 MHz timebase, 1GHz processor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) extern unsigned long ppc_proc_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) extern unsigned long ppc_tb_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define DEFAULT_TB_FREQ 125000000UL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) extern bool tb_invalid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct div_result {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) u64 result_high;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u64 result_low;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static inline unsigned long get_tbl(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return mftb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static inline u64 get_vtb(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #ifdef CONFIG_PPC_BOOK3S_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (cpu_has_feature(CPU_FTR_ARCH_207S))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return mfspr(SPRN_VTB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static inline u64 get_tb(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) unsigned int tbhi, tblo, tbhi2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (IS_ENABLED(CONFIG_PPC64))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return mftb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) tbhi = mftbu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) tblo = mftb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) tbhi2 = mftbu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) } while (tbhi != tbhi2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return ((u64)tbhi << 32) | tblo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static inline void set_tb(unsigned int upper, unsigned int lower)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) mtspr(SPRN_TBWL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) mtspr(SPRN_TBWU, upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) mtspr(SPRN_TBWL, lower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /* Accessor functions for the decrementer register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * The 4xx doesn't even have a decrementer. I tried to use the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * generic timer interrupt code, which seems OK, with the 4xx PIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * in auto-reload mode. The problem is PIT stops counting when it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * hits zero. If it would wrap, we could use it just like a decrementer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static inline u64 get_dec(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (IS_ENABLED(CONFIG_40x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return mfspr(SPRN_PIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return mfspr(SPRN_DEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Note: Book E and 4xx processors differ from other PowerPC processors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * in when the decrementer generates its interrupt: on the 1 to 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * transition for Book E/4xx, but on the 0 to -1 transition for others.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static inline void set_dec(u64 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (IS_ENABLED(CONFIG_40x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) mtspr(SPRN_PIT, (u32)val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) else if (IS_ENABLED(CONFIG_BOOKE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) mtspr(SPRN_DEC, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) mtspr(SPRN_DEC, val - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static inline unsigned long tb_ticks_since(unsigned long tstamp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return mftb() - tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #define mulhwu(x,y) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #define mulhdu(x,y) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) extern u64 mulhdu(u64, u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) extern void div128_by_32(u64 dividend_high, u64 dividend_low,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) unsigned divisor, struct div_result *dr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) extern void secondary_cpu_time_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) extern void __init time_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) DECLARE_PER_CPU(u64, decrementers_next_tb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /* Convert timebase ticks to nanoseconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) unsigned long long tb_to_ns(unsigned long long tb_ticks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /* SPLPAR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) void accumulate_stolen_time(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #endif /* __KERNEL__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #endif /* __POWERPC_TIME_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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