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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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8
drivers/base/regmap/internal.h
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@@ -31,8 +31,14 @@ struct regmap_format {
unsigned int (*parse_val)(void *buf);
};
typedef void (*regmap_lock)(struct regmap *map);
typedef void (*regmap_unlock)(struct regmap *map);
struct regmap {
struct mutex lock;
struct mutex mutex;
spinlock_t spinlock;
regmap_lock lock;
regmap_unlock unlock;
struct device *dev; /* Device we do I/O on */
void *work_buf; /* Scratch buffer used to format I/O */