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: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -148,6 +148,7 @@ struct regcache_ops {
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int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
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int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
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int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
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int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
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};
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bool regmap_writeable(struct regmap *map, unsigned int reg);
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@ -358,6 +358,43 @@ out:
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}
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EXPORT_SYMBOL_GPL(regcache_sync_region);
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/**
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* regcache_drop_region: Discard part of the register cache
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*
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* @map: map to operate on
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* @min: first register to discard
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* @max: last register to discard
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*
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* Discard part of the register cache.
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*
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* Return a negative value on failure, 0 on success.
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*/
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int regcache_drop_region(struct regmap *map, unsigned int min,
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unsigned int max)
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{
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unsigned int reg;
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int ret = 0;
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if (!map->cache_present && !(map->cache_ops && map->cache_ops->drop))
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return -EINVAL;
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map->lock(map);
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trace_regcache_drop_region(map->dev, min, max);
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if (map->cache_present)
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for (reg = min; reg < max + 1; reg++)
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clear_bit(reg, map->cache_present);
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if (map->cache_ops && map->cache_ops->drop)
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ret = map->cache_ops->drop(map, min, max);
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map->unlock(map);
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return ret;
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}
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EXPORT_SYMBOL_GPL(regcache_drop_region);
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/**
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* regcache_cache_only: Put a register map into cache only mode
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*
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@ -394,6 +394,8 @@ bool regmap_can_raw_write(struct regmap *map);
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int regcache_sync(struct regmap *map);
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int regcache_sync_region(struct regmap *map, unsigned int min,
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unsigned int max);
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int regcache_drop_region(struct regmap *map, unsigned int min,
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unsigned int max);
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void regcache_cache_only(struct regmap *map, bool enable);
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void regcache_cache_bypass(struct regmap *map, bool enable);
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void regcache_mark_dirty(struct regmap *map);
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@ -562,6 +564,13 @@ static inline int regcache_sync_region(struct regmap *map, unsigned int min,
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return -EINVAL;
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}
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static inline int regcache_drop_region(struct regmap *map, unsigned int min,
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unsigned int max)
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{
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WARN_ONCE(1, "regmap API is disabled");
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return -EINVAL;
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}
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static inline void regcache_cache_only(struct regmap *map, bool enable)
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{
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WARN_ONCE(1, "regmap API is disabled");
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@ -223,6 +223,29 @@ DEFINE_EVENT(regmap_async, regmap_async_complete_done,
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);
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TRACE_EVENT(regcache_drop_region,
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TP_PROTO(struct device *dev, unsigned int from,
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unsigned int to),
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TP_ARGS(dev, from, to),
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TP_STRUCT__entry(
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__string( name, dev_name(dev) )
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__field( unsigned int, from )
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__field( unsigned int, to )
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),
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TP_fast_assign(
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__assign_str(name, dev_name(dev));
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__entry->from = from;
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__entry->to = to;
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),
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TP_printk("%s %u-%u", __get_str(name), (unsigned int)__entry->from,
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(unsigned int)__entry->to)
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);
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#endif /* _TRACE_REGMAP_H */
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/* This part must be outside protection */
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