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regmap: introduce fast_io busses, and use a spinlock for them

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Some bus types have very fast IO. For these, acquiring a mutex for every
IO operation is a significant overhead. Allow busses to indicate their IO
is fast, and enhance regmap to use a spinlock for those busses.

[Currently limited to native endian registers -- broonie]

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Warren
2012-04-04 15:48:28 -06:00
committed by Mark Brown
parent 0135bbcc7a
commit bacdbe0773
5 changed files with 67 additions and 30 deletions
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drivers/base/regmap/regcache.c
+10 -10
View File
@@ -264,7 +264,7 @@ int regcache_sync(struct regmap *map)
BUG_ON(!map->cache_ops || !map->cache_ops->sync);
mutex_lock(&map->lock);
map->lock(map);
/* Remember the initial bypass state */
bypass = map->cache_bypass;
dev_dbg(map->dev, "Syncing %s cache\n",
@@ -296,7 +296,7 @@ out:
trace_regcache_sync(map->dev, name, "stop");
/* Restore the bypass state */
map->cache_bypass = bypass;
mutex_unlock(&map->lock);
map->unlock(map);
return ret;
}
@@ -323,7 +323,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
BUG_ON(!map->cache_ops || !map->cache_ops->sync);
mutex_lock(&map->lock);
map->lock(map);
/* Remember the initial bypass state */
bypass = map->cache_bypass;
@@ -342,7 +342,7 @@ out:
trace_regcache_sync(map->dev, name, "stop region");
/* Restore the bypass state */
map->cache_bypass = bypass;
mutex_unlock(&map->lock);
map->unlock(map);
return ret;
}
@@ -361,11 +361,11 @@ out:
*/
void regcache_cache_only(struct regmap *map, bool enable)
{
mutex_lock(&map->lock);
map->lock(map);
WARN_ON(map->cache_bypass && enable);
map->cache_only = enable;
trace_regmap_cache_only(map->dev, enable);
mutex_unlock(&map->lock);
map->unlock(map);
}
EXPORT_SYMBOL_GPL(regcache_cache_only);
@@ -380,9 +380,9 @@ EXPORT_SYMBOL_GPL(regcache_cache_only);
*/
void regcache_mark_dirty(struct regmap *map)
{
mutex_lock(&map->lock);
map->lock(map);
map->cache_dirty = true;
mutex_unlock(&map->lock);
map->unlock(map);
}
EXPORT_SYMBOL_GPL(regcache_mark_dirty);
@@ -399,11 +399,11 @@ EXPORT_SYMBOL_GPL(regcache_mark_dirty);
*/
void regcache_cache_bypass(struct regmap *map, bool enable)
{
mutex_lock(&map->lock);
map->lock(map);
WARN_ON(map->cache_only && enable);
map->cache_bypass = enable;
trace_regmap_cache_bypass(map->dev, enable);
mutex_unlock(&map->lock);
map->unlock(map);
}
EXPORT_SYMBOL_GPL(regcache_cache_bypass);