Lines Matching +full:enable +full:- +full:frequency +full:- +full:shift

1 /* SPDX-License-Identifier: GPL-2.0 */
35  * struct clocksource - hardware abstraction for a free running counter
36  *	Provides mostly state-free accessors to the underlying hardware.
43  * @shift:		Cycle to nanosecond divisor (power of two)
48  * @archdata:		Optional arch-specific data
57  *			1-99: Unfit for real use
59  *			100-199: Base level usability.
61  *			200-299: Good.
63  *			300-399: Desired.
65  *			400-499: Perfect
66  *				The ideal clocksource. A must-use where
73  * @enable:		Optional function to enable the clocksource
100 	u32			shift;  member
115 	int			(*enable)(struct clocksource *cs);  member
145 #define CLOCKSOURCE_MASK(bits) GENMASK_ULL((bits) - 1, 0)
150 	 *  mult/2^shift  = ns/cyc  in clocksource_freq2mult()
151 	 *  mult = ns/cyc * 2^shift  in clocksource_freq2mult()
152 	 *  mult = from/freq * 2^shift  in clocksource_freq2mult()
153 	 *  mult = from * 2^shift / freq  in clocksource_freq2mult()
154 	 *  mult = (from<<shift) / freq  in clocksource_freq2mult()
165  * clocksource_khz2mult - calculates mult from khz and shift
166  * @khz:		Clocksource frequency in KHz
167  * @shift_constant:	Clocksource shift factor
169  * Helper functions that converts a khz counter frequency to a timsource
170  * multiplier, given the clocksource shift value
178  * clocksource_hz2mult - calculates mult from hz and shift
179  * @hz:			Clocksource frequency in Hz
180  * @shift_constant:	Clocksource shift factor
183  * frequency to a timsource multiplier, given the
184  * clocksource shift value
192  * clocksource_cyc2ns - converts clocksource cycles to nanoseconds
195  * @shift:	cycle to nanosecond divisor (power of two)
197  * Converts clocksource cycles to nanoseconds, using the given @mult and @shift.
202  * XXX - This could use some mult_lxl_ll() asm optimization
204 static inline s64 clocksource_cyc2ns(u64 cycles, u32 mult, u32 shift)  in clocksource_cyc2ns()  argument
206 	return ((u64) cycles * mult) >> shift;  in clocksource_cyc2ns()
222 clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cycles);
224 clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);