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regmap: Allow buses to provide a custom update_bits() operation

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Some buses provide a native _update_bits() operation which for uncached
 registers is faster than doing a read/modify/write cycle as it is a
 single bus transaction.  Add support for implementing this to regmap.
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Merge tag 'regmap-offload-update-bits' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

regmap: Allow buses to provide a custom update_bits() operation

Some buses provide a native _update_bits() operation which for uncached
registers is faster than doing a read/modify/write cycle as it is a
single bus transaction.  Add support for implementing this to regmap.
This commit is contained in:
David S. Miller 2015-10-08 04:01:28 -07:00
commit 61d0372028
3 changed files with 23 additions and 11 deletions
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2
drivers/base/regmap/internal.h
View File

@ -98,6 +98,8 @@ 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 defer_caching;

29
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);
@ -2509,20 +2510,26 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
int ret;
unsigned int tmp, orig;
ret = _regmap_read(map, reg, &orig);
if (ret != 0)
return ret;
if (change)
*change = false;
tmp = orig & ~mask;
tmp |= val & mask;
if (force_write || (tmp != orig)) {
ret = _regmap_write(map, reg, tmp);
if (change)
if (regmap_volatile(map, reg) && map->reg_update_bits) {
ret = map->reg_update_bits(map->bus_context, reg, mask, val);
if (ret == 0 && change)
*change = true;
} else {
if (change)
*change = false;
ret = _regmap_read(map, reg, &orig);
if (ret != 0)
return ret;
tmp = orig & ~mask;
tmp |= val & mask;
if (force_write || (tmp != orig)) {
ret = _regmap_write(map, reg, tmp);
if (ret == 0 && change)
*change = true;
}
}
return ret;

3
include/linux/regmap.h
View File

@ -296,6 +296,8 @@ 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);
typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
typedef void (*regmap_hw_free_context)(void *context);
@ -335,6 +337,7 @@ 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;