diff options
| author |   Mark Brown <broonie@kernel.org> | 2017-01-24 16:24:18 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-01-24 16:24:18 +0000 |
| commit | dbbc21bbf2c640dd148903e82f752c2f269fc58a (patch) | |
| tree | e85f5b686774e2fbae6387f94bf44c4076c49046 /include/linux/clocksource.h | |
| parent | ASoC: hdac_hdmi: use audio component framework to read ELD (diff) | |
| parent | Linux 4.10-rc1 (diff) | |
Merge tag 'v4.10-rc1' into asoc-intel
Linux 4.10-rc1
Diffstat (limited to 'include/linux/clocksource.h')
| -rw-r--r-- | include/linux/clocksource.h | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 08398182f56e..e315d04a2fd9 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -75,8 +75,8 @@ struct module; * structure. */ struct clocksource { - cycle_t (*read)(struct clocksource *cs); - cycle_t mask; + u64 (*read)(struct clocksource *cs); + u64 mask; u32 mult; u32 shift; u64 max_idle_ns; @@ -98,8 +98,8 @@ struct clocksource { #ifdef CONFIG_CLOCKSOURCE_WATCHDOG /* Watchdog related data, used by the framework */ struct list_head wd_list; - cycle_t cs_last; - cycle_t wd_last; + u64 cs_last; + u64 wd_last; #endif struct module *owner; }; @@ -117,7 +117,7 @@ struct clocksource { #define CLOCK_SOURCE_RESELECT 0x100 /* simplify initialization of mask field */ -#define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1) +#define CLOCKSOURCE_MASK(bits) (u64)((bits) < 64 ? ((1ULL<<(bits))-1) : -1) static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from) { @@ -169,11 +169,14 @@ static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant) * @mult: cycle to nanosecond multiplier * @shift: cycle to nanosecond divisor (power of two) * - * Converts cycles to nanoseconds, using the given mult and shift. + * Converts clocksource cycles to nanoseconds, using the given @mult and @shift. + * The code is optimized for performance and is not intended to work + * with absolute clocksource cycles (as those will easily overflow), + * but is only intended to be used with relative (delta) clocksource cycles. * * XXX - This could use some mult_lxl_ll() asm optimization */ -static inline s64 clocksource_cyc2ns(cycle_t cycles, u32 mult, u32 shift) +static inline s64 clocksource_cyc2ns(u64 cycles, u32 mult, u32 shift) { return ((u64) cycles * mult) >> shift; } @@ -233,13 +236,13 @@ static inline void __clocksource_update_freq_khz(struct clocksource *cs, u32 khz extern int timekeeping_notify(struct clocksource *clock); -extern cycle_t clocksource_mmio_readl_up(struct clocksource *); -extern cycle_t clocksource_mmio_readl_down(struct clocksource *); -extern cycle_t clocksource_mmio_readw_up(struct clocksource *); -extern cycle_t clocksource_mmio_readw_down(struct clocksource *); +extern u64 clocksource_mmio_readl_up(struct clocksource *); +extern u64 clocksource_mmio_readl_down(struct clocksource *); +extern u64 clocksource_mmio_readw_up(struct clocksource *); +extern u64 clocksource_mmio_readw_down(struct clocksource *); extern int clocksource_mmio_init(void __iomem *, const char *, - unsigned long, int, unsigned, cycle_t (*)(struct clocksource *)); + unsigned long, int, unsigned, u64 (*)(struct clocksource *)); extern int clocksource_i8253_init(void); |