regmap: Support raw reads from cached registers
Fall back to a register by register read to do so; most likely we'll be cache only so the overhead will be low. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
parent
7d5e525b9c
commit
b8fb5ab156
|
@ -604,16 +604,32 @@ EXPORT_SYMBOL_GPL(regmap_read);
|
|||
int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
|
||||
size_t val_len)
|
||||
{
|
||||
size_t val_count = val_len / map->format.val_bytes;
|
||||
int ret;
|
||||
|
||||
WARN_ON(!regmap_volatile_range(map, reg, val_count) &&
|
||||
map->cache_type != REGCACHE_NONE);
|
||||
size_t val_bytes = map->format.val_bytes;
|
||||
size_t val_count = val_len / val_bytes;
|
||||
unsigned int v;
|
||||
int ret, i;
|
||||
|
||||
mutex_lock(&map->lock);
|
||||
|
||||
ret = _regmap_raw_read(map, reg, val, val_len);
|
||||
if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
|
||||
map->cache_type == REGCACHE_NONE) {
|
||||
/* Physical block read if there's no cache involved */
|
||||
ret = _regmap_raw_read(map, reg, val, val_len);
|
||||
|
||||
} else {
|
||||
/* Otherwise go word by word for the cache; should be low
|
||||
* cost as we expect to hit the cache.
|
||||
*/
|
||||
for (i = 0; i < val_count; i++) {
|
||||
ret = _regmap_read(map, reg + i, &v);
|
||||
if (ret != 0)
|
||||
goto out;
|
||||
|
||||
map->format.format_val(val + (i * val_bytes), v);
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&map->lock);
|
||||
|
||||
return ret;
|
||||
|
|
Loading…
Reference in a new issue