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regcache: flat: Introduce register strider order 

Here we introduce regcache_flat_get_index(), which using register
stride order and bit rotation, will save some memory spaces for
flat cache. Though this will also lost some access performance,
since the bit rotation is used to get the index of the cache array,
and this could be ingored for memory I/O accessing.

Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Xiubo Li 2016-01-04 18:00:35 +08:00 committed by Mark Brown
parent 8b31ec5572
commit ce11020f0e
1 changed files with 15 additions and 5 deletions
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20
drivers/base/regmap/regcache-flat.c
View File

@ -16,20 +16,30 @@
#include "internal.h"
static inline unsigned int regcache_flat_get_index(const struct regmap *map,
unsigned int reg)
{
return regcache_get_index_by_order(map, reg);
}
static int regcache_flat_init(struct regmap *map)
{
int i;
unsigned int *cache;
map->cache = kcalloc(map->max_register + 1, sizeof(unsigned int),
GFP_KERNEL);
if (!map || map->reg_stride_order < 0)
return -EINVAL;
map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
+ 1, sizeof(unsigned int), GFP_KERNEL);
if (!map->cache)
return -ENOMEM;
cache = map->cache;
for (i = 0; i < map->num_reg_defaults; i++)
cache[map->reg_defaults[i].reg] = map->reg_defaults[i].def;
cache[regcache_flat_get_index(map, map->reg_defaults[i].reg)] =
map->reg_defaults[i].def;
return 0;
}
@ -47,7 +57,7 @@ static int regcache_flat_read(struct regmap *map,
{
unsigned int *cache = map->cache;
*value = cache[reg];
*value = cache[regcache_flat_get_index(map, reg)];
return 0;
}
@ -57,7 +67,7 @@ static int regcache_flat_write(struct regmap *map, unsigned int reg,
{
unsigned int *cache = map->cache;
cache[reg] = value;
cache[regcache_flat_get_index(map, reg)] = value;
return 0;
}