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regmap: Add support for discarding parts of the register cache

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

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-05-08 13:55:22 +01:00
parent f722406faa
commit 697e85bc6a
4 changed files with 70 additions and 0 deletions
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1
drivers/base/regmap/internal.h
View File

@ -148,6 +148,7 @@ struct regcache_ops {
int (*read)(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 (*drop)(struct regmap *map, unsigned int min, unsigned int max);
};
bool regmap_writeable(struct regmap *map, unsigned int reg);

37
drivers/base/regmap/regcache.c
View File

@ -358,6 +358,43 @@ out:
}
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
*

9
include/linux/regmap.h
View File

@ -394,6 +394,8 @@ bool regmap_can_raw_write(struct regmap *map);
int regcache_sync(struct regmap *map);
int regcache_sync_region(struct regmap *map, unsigned int min,
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_bypass(struct regmap *map, bool enable);
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;
}
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)
{
WARN_ONCE(1, "regmap API is disabled");

23
include/trace/events/regmap.h
View File

@ -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 */
/* This part must be outside protection */