Commit 697e85bc authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Add support for discarding parts of the register cache 



Allow drivers to discard parts of the register cache, for example if part
of the hardware has been reset.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent f722406f

drivers/base/regmap/internal.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -148,6 +148,7 @@ struct regcache_ops { 
	int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);

	int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);

	int (*write)(struct regmap *map, unsigned int reg, unsigned int value);

	int (*write)(struct regmap *map, unsigned int reg, unsigned int value);

	int (*sync)(struct regmap *map, unsigned int min, unsigned int max);

	int (*sync)(struct regmap *map, unsigned int min, unsigned int max);

	int (*drop)(struct regmap *map, unsigned int min, unsigned int max);

};

};





bool regmap_writeable(struct regmap *map, unsigned int reg);

bool regmap_writeable(struct regmap *map, unsigned int reg);

drivers/base/regmap/regcache.c

+37 −0
Original line number Original line Diff line number Diff line
@@ -358,6 +358,43 @@ int regcache_sync_region(struct regmap *map, unsigned int min, 
}

}

EXPORT_SYMBOL_GPL(regcache_sync_region);

EXPORT_SYMBOL_GPL(regcache_sync_region);





/**

 * regcache_drop_region: Discard part of the register cache

 *

 * @map: map to operate on

 * @min: first register to discard

 * @max: last register to discard

 *

 * Discard part of the register cache.

 *

 * Return a negative value on failure, 0 on success.

 */

int regcache_drop_region(struct regmap *map, unsigned int min,

			 unsigned int max)

{

	unsigned int reg;

	int ret = 0;



	if (!map->cache_present && !(map->cache_ops && map->cache_ops->drop))

		return -EINVAL;



	map->lock(map);



	trace_regcache_drop_region(map->dev, min, max);



	if (map->cache_present)

		for (reg = min; reg < max + 1; reg++)

			clear_bit(reg, map->cache_present);



	if (map->cache_ops && map->cache_ops->drop)

		ret = map->cache_ops->drop(map, min, max);



	map->unlock(map);



	return ret;

}

EXPORT_SYMBOL_GPL(regcache_drop_region);



/**

/**

 * regcache_cache_only: Put a register map into cache only mode

 * regcache_cache_only: Put a register map into cache only mode

 *

 *

include/linux/regmap.h

+9 −0
Original line number Original line Diff line number Diff line
@@ -394,6 +394,8 @@ bool regmap_can_raw_write(struct regmap *map); 
int regcache_sync(struct regmap *map);

int regcache_sync(struct regmap *map);

int regcache_sync_region(struct regmap *map, unsigned int min,

int regcache_sync_region(struct regmap *map, unsigned int min,

			 unsigned int max);

			 unsigned int max);

int regcache_drop_region(struct regmap *map, unsigned int min,

			 unsigned int max);

void regcache_cache_only(struct regmap *map, bool enable);

void regcache_cache_only(struct regmap *map, bool enable);

void regcache_cache_bypass(struct regmap *map, bool enable);

void regcache_cache_bypass(struct regmap *map, bool enable);

void regcache_mark_dirty(struct regmap *map);

void regcache_mark_dirty(struct regmap *map);
@@ -562,6 +564,13 @@ static inline int regcache_sync_region(struct regmap *map, unsigned int min, 
	return -EINVAL;

	return -EINVAL;

}

}





static inline int regcache_drop_region(struct regmap *map, unsigned int min,

				       unsigned int max)

{

	WARN_ONCE(1, "regmap API is disabled");

	return -EINVAL;

}



static inline void regcache_cache_only(struct regmap *map, bool enable)

static inline void regcache_cache_only(struct regmap *map, bool enable)

{

{

	WARN_ONCE(1, "regmap API is disabled");

	WARN_ONCE(1, "regmap API is disabled");

include/trace/events/regmap.h

+23 −0
Original line number Original line Diff line number Diff line
@@ -223,6 +223,29 @@ DEFINE_EVENT(regmap_async, regmap_async_complete_done, 




);

);





TRACE_EVENT(regcache_drop_region,



	TP_PROTO(struct device *dev, unsigned int from,

		 unsigned int to),



	TP_ARGS(dev, from, to),



	TP_STRUCT__entry(

		__string(       name,           dev_name(dev)   )

		__field(	unsigned int,	from		)

		__field(	unsigned int,	to		)

	),



	TP_fast_assign(

		__assign_str(name, dev_name(dev));

		__entry->from = from;

		__entry->to = to;

	),



	TP_printk("%s %u-%u", __get_str(name), (unsigned int)__entry->from,

		  (unsigned int)__entry->to)

);



#endif /* _TRACE_REGMAP_H */

#endif /* _TRACE_REGMAP_H */





/* This part must be outside protection */

/* This part must be outside protection */