// 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 {	void __iomem *reg;	struct clocksource clksrc;}; static inline struct clocksource_mmio *to_mmio_clksrc(struct clocksource *c){	return container_of(c, struct clocksource_mmio, clksrc);} u64 clocksource_mmio_readl_up(struct clocksource *c){	return (u64)readl_relaxed(to_mmio_clksrc(c)->reg);}EXPORT_SYMBOL_GPL(clocksource_mmio_readl_up); u64 clocksource_mmio_readl_down(struct clocksource *c){	return ~(u64)readl_relaxed(to_mmio_clksrc(c)->reg) & c->mask;}EXPORT_SYMBOL_GPL(clocksource_mmio_readl_down); u64 clocksource_mmio_readw_up(struct clocksource *c){	return (u64)readw_relaxed(to_mmio_clksrc(c)->reg);}EXPORT_SYMBOL_GPL(clocksource_mmio_readw_up); u64 clocksource_mmio_readw_down(struct clocksource *c){	return ~(u64)readw_relaxed(to_mmio_clksrc(c)->reg) & c->mask;}EXPORT_SYMBOL_GPL(clocksource_mmio_readw_down); /** * 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 clocksource_mmio_init(void __iomem *base, const char *name,			  unsigned long hz, int rating, unsigned bits,			  u64 (*read)(struct clocksource *)){	struct clocksource_mmio *cs; 	if (bits > 64 || bits < 16)		return -EINVAL; 	cs = kzalloc_obj(struct clocksource_mmio);	if (!cs)		return -ENOMEM; 	cs->reg = base;	cs->clksrc.name = name;	cs->clksrc.rating = rating;	cs->clksrc.read = read;	cs->clksrc.mask = CLOCKSOURCE_MASK(bits);	cs->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS; 	return clocksource_register_hz(&cs->clksrc, hz);}EXPORT_SYMBOL_GPL(clocksource_mmio_init);