redonkable/alistair23-linux
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regmap: Implemented default cache sync operation

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This can be used for cache types for which syncing values one by one is
equally efficient as syncing a range, such as the flat cache.

Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Maarten ter Huurne 2013-06-03 00:15:26 +02:00 committed by Mark Brown
parent 92ab1aab59
commit d856fce41b
1 changed files with 42 additions and 4 deletions
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46
drivers/base/regmap/regcache.c
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@ -250,6 +250,38 @@ int regcache_write(struct regmap *map,
return 0;
}
static int regcache_default_sync(struct regmap *map, unsigned int min,
unsigned int max)
{
unsigned int reg;
for (reg = min; reg <= max; reg++) {
unsigned int val;
int ret;
if (regmap_volatile(map, reg))
continue;
ret = regcache_read(map, reg, &val);
if (ret)
return ret;
/* Is this the hardware default? If so skip. */
ret = regcache_lookup_reg(map, reg);
if (ret >= 0 && val == map->reg_defaults[ret].def)
continue;
map->cache_bypass = 1;
ret = _regmap_write(map, reg, val);
map->cache_bypass = 0;
if (ret)
return ret;
dev_dbg(map->dev, "Synced register %#x, value %#x\n", reg, val);
}
return 0;
}
/**
* regcache_sync: Sync the register cache with the hardware.
*
@ -268,7 +300,7 @@ int regcache_sync(struct regmap *map)
const char *name;
unsigned int bypass;
BUG_ON(!map->cache_ops || !map->cache_ops->sync);
BUG_ON(!map->cache_ops);
map->lock(map->lock_arg);
/* Remember the initial bypass state */
@ -297,7 +329,10 @@ int regcache_sync(struct regmap *map)
}
map->cache_bypass = 0;
ret = map->cache_ops->sync(map, 0, map->max_register);
if (map->cache_ops->sync)
ret = map->cache_ops->sync(map, 0, map->max_register);
else
ret = regcache_default_sync(map, 0, map->max_register);
if (ret == 0)
map->cache_dirty = false;
@ -331,7 +366,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
const char *name;
unsigned int bypass;
BUG_ON(!map->cache_ops || !map->cache_ops->sync);
BUG_ON(!map->cache_ops);
map->lock(map->lock_arg);
@ -346,7 +381,10 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
if (!map->cache_dirty)
goto out;
ret = map->cache_ops->sync(map, min, max);
if (map->cache_ops->sync)
ret = map->cache_ops->sync(map, min, max);
else
ret = regcache_default_sync(map, min, max);
out:
trace_regcache_sync(map->dev, name, "stop region");