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regmap: rbtree-cache: Move cached rbnode handling into lookup function 

Move the handling of the cached rbnode into regcache_rbtree_lookup. This allows
us to remove of some duplicated code sections in regcache_rbtree_read and
regcache_rbtree_write.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Lars-Peter Clausen 2011-09-27 20:15:38 +02:00 committed by Mark Brown
parent c5713004b3
commit 3405addd22
1 changed files with 19 additions and 44 deletions
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63
drivers/base/regmap/regcache-rbtree.c
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@ -56,23 +56,33 @@ static void regcache_rbtree_set_register(struct regcache_rbtree_node *rbnode,
regcache_set_val(rbnode->block, idx, val, word_size);
}
static struct regcache_rbtree_node *regcache_rbtree_lookup(
struct rb_root *root, unsigned int reg)
static struct regcache_rbtree_node *regcache_rbtree_lookup(struct regmap *map,
unsigned int reg)
{
struct regcache_rbtree_ctx *rbtree_ctx = map->cache;
struct rb_node *node;
struct regcache_rbtree_node *rbnode;
unsigned int base_reg, top_reg;
node = root->rb_node;
while (node) {
rbnode = container_of(node, struct regcache_rbtree_node, node);
rbnode = rbtree_ctx->cached_rbnode;
if (rbnode) {
regcache_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
if (reg >= base_reg && reg <= top_reg)
return rbnode;
else if (reg > top_reg)
}
node = rbtree_ctx->root.rb_node;
while (node) {
rbnode = container_of(node, struct regcache_rbtree_node, node);
regcache_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
if (reg >= base_reg && reg <= top_reg) {
rbtree_ctx->cached_rbnode = rbnode;
return rbnode;
} else if (reg > top_reg) {
node = node->rb_right;
else if (reg < base_reg)
} else if (reg < base_reg) {
node = node->rb_left;
}
}
return NULL;
@ -174,32 +184,14 @@ static int regcache_rbtree_exit(struct regmap *map)
static int regcache_rbtree_read(struct regmap *map,
unsigned int reg, unsigned int *value)
{
struct regcache_rbtree_ctx *rbtree_ctx;
struct regcache_rbtree_node *rbnode;
unsigned int base_reg, top_reg;
unsigned int reg_tmp;
rbtree_ctx = map->cache;
/* look up the required register in the cached rbnode */
rbnode = rbtree_ctx->cached_rbnode;
if (rbnode) {
regcache_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
if (reg >= base_reg && reg <= top_reg) {
reg_tmp = reg - base_reg;
*value = regcache_rbtree_get_register(rbnode, reg_tmp,
map->cache_word_size);
return 0;
}
}
/* if we can't locate it in the cached rbnode we'll have
* to traverse the rbtree looking for it.
*/
rbnode = regcache_rbtree_lookup(&rbtree_ctx->root, reg);
rbnode = regcache_rbtree_lookup(map, reg);
if (rbnode) {
reg_tmp = reg - rbnode->base_reg;
*value = regcache_rbtree_get_register(rbnode, reg_tmp,
map->cache_word_size);
rbtree_ctx->cached_rbnode = rbnode;
} else {
/* uninitialized registers default to 0 */
*value = 0;
@ -243,31 +235,15 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
struct rb_node *node;
unsigned int val;
unsigned int reg_tmp;
unsigned int base_reg, top_reg;
unsigned int pos;
int i;
int ret;
rbtree_ctx = map->cache;
/* look up the required register in the cached rbnode */
rbnode = rbtree_ctx->cached_rbnode;
if (rbnode) {
regcache_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
if (reg >= base_reg && reg <= top_reg) {
reg_tmp = reg - base_reg;
val = regcache_rbtree_get_register(rbnode, reg_tmp,
map->cache_word_size);
if (val == value)
return 0;
regcache_rbtree_set_register(rbnode, reg_tmp, value,
map->cache_word_size);
return 0;
}
}
/* if we can't locate it in the cached rbnode we'll have
* to traverse the rbtree looking for it.
*/
rbnode = regcache_rbtree_lookup(&rbtree_ctx->root, reg);
rbnode = regcache_rbtree_lookup(map, reg);
if (rbnode) {
reg_tmp = reg - rbnode->base_reg;
val = regcache_rbtree_get_register(rbnode, reg_tmp,
@ -276,7 +252,6 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
return 0;
regcache_rbtree_set_register(rbnode, reg_tmp, value,
map->cache_word_size);
rbtree_ctx->cached_rbnode = rbnode;
} else {
/* bail out early, no need to create the rbnode yet */
if (!value)