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authorJon Ringle <jringle@gridpoint.com>2015-10-01 07:43:20 -0400
committerDavid S. Miller <davem@davemloft.net>2015-10-05 04:02:40 -0700
commit7741c373cf3ea1f5383fa97fb7a640a429d3dd7c (patch)
tree83052fc982be30c96213875967fedd35e03a89ca /drivers/base
parentenic: do hang reset only in case of tx timeout (diff)
downloadlinux-dev-7741c373cf3ea1f5383fa97fb7a640a429d3dd7c.tar.xz
linux-dev-7741c373cf3ea1f5383fa97fb7a640a429d3dd7c.zip
regmap: Allow installing custom reg_update_bits function
This commit allows installing a custom reg_update_bits function for cases where the hardware provides a mechanism to set or clear register bits without a read/modify/write cycle. Such is the case with the Microchip ENCX24J600. Signed-off-by: Jon Ringle <jringle@gridpoint.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--drivers/base/regmap/internal.h3
-rw-r--r--drivers/base/regmap/regmap.c25
2 files changed, 28 insertions, 0 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index cc557886ab23..4036d7a90f63 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -98,6 +98,9 @@ struct regmap {
int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
int (*reg_write)(void *context, unsigned int reg, unsigned int val);
+ int (*reg_update_bits)(void *context, unsigned int reg,
+ unsigned int mask, unsigned int val,
+ bool *change, bool force_write);
bool defer_caching;
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index afaf56200674..70387c9f281b 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -619,6 +619,7 @@ struct regmap *__regmap_init(struct device *dev,
goto skip_format_initialization;
} else {
map->reg_read = _regmap_bus_read;
+ map->reg_update_bits = bus->reg_update_bits;
}
reg_endian = regmap_get_reg_endian(bus, config);
@@ -2509,6 +2510,30 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
int ret;
unsigned int tmp, orig;
+ if (map->reg_update_bits) {
+ ret = map->reg_update_bits(map->bus_context, reg, mask, val,
+ change, force_write);
+ if (ret != 0)
+ return ret;
+
+ /* Fix up the cache by read/modify/write */
+ if (!map->cache_bypass && !map->defer_caching) {
+ ret = regcache_read(map, reg, &orig);
+ if (ret != 0)
+ return ret;
+
+ tmp = orig & ~mask;
+ tmp |= val & mask;
+
+ ret = regcache_write(map, reg, tmp);
+ if (ret != 0)
+ return ret;
+ if (map->cache_only)
+ map->cache_dirty = true;
+ }
+ return ret;
+ }
+
ret = _regmap_read(map, reg, &orig);
if (ret != 0)
return ret;