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regmap: Allow installing custom reg_update_bits function

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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>
This commit is contained in:
Jon Ringle 2015-10-01 07:43:20 -04:00 committed by David S. Miller
parent 937317c7c1
commit 7741c373cf
3 changed files with 32 additions and 0 deletions
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3
drivers/base/regmap/internal.h
View File

@ -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;

25
drivers/base/regmap/regmap.c
View File

@ -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;

4
include/linux/regmap.h
View File

@ -296,6 +296,9 @@ typedef int (*regmap_hw_reg_read)(void *context, unsigned int reg,
unsigned int *val);
typedef int (*regmap_hw_reg_write)(void *context, unsigned int reg,
unsigned int val);
typedef int (*regmap_hw_reg_update_bits)(void *context, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change, bool force_write);
typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
typedef void (*regmap_hw_free_context)(void *context);
@ -335,6 +338,7 @@ struct regmap_bus {
regmap_hw_gather_write gather_write;
regmap_hw_async_write async_write;
regmap_hw_reg_write reg_write;
regmap_hw_reg_update_bits reg_update_bits;
regmap_hw_read read;
regmap_hw_reg_read reg_read;
regmap_hw_free_context free_context;