linux/drivers/clocksource/mmio.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Generic MMIO clocksource support
 */
#include <linux/clocksource.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>

struct clocksource_mmio { … };

static inline struct clocksource_mmio *to_mmio_clksrc(struct clocksource *c)
{ … }

u64 clocksource_mmio_readl_up(struct clocksource *c)
{ … }

u64 clocksource_mmio_readl_down(struct clocksource *c)
{ … }

u64 clocksource_mmio_readw_up(struct clocksource *c)
{ … }

u64 clocksource_mmio_readw_down(struct clocksource *c)
{ … }

/**
 * clocksource_mmio_init - Initialize a simple mmio based clocksource
 * @base:	Virtual address of the clock readout register
 * @name:	Name of the clocksource
 * @hz:		Frequency of the clocksource in Hz
 * @rating:	Rating of the clocksource
 * @bits:	Number of valid bits
 * @read:	One of clocksource_mmio_read*() above
 */
int __init clocksource_mmio_init(void __iomem *base, const char *name,
	unsigned long hz, int rating, unsigned bits,
	u64 (*read)(struct clocksource *))
{ … }