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regmap: Converts group operation into single read write operations 

Some devices does not support bulk read and write operations, for them
we have series of single write and read operations.

Signed-off-by: Anthony Olech <Anthony.Olech@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
[Fixed coding style, don't check use_single_rw before assign --broonie ]
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Ashish Jangam 2012-04-30 23:23:40 +01:00 committed by Mark Brown
parent 56806555de
commit 2e33caf16f
3 changed files with 44 additions and 4 deletions
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3
drivers/base/regmap/internal.h
View File

@ -91,6 +91,9 @@ struct regmap {
struct reg_default *patch;
int patch_regs;
/* if set, converts bulk rw to single rw */
bool use_single_rw;
};
struct regcache_ops {

40
drivers/base/regmap/regmap.c
View File

@ -247,6 +247,7 @@ struct regmap *regmap_init(struct device *dev,
map->reg_stride = config->reg_stride;
else
map->reg_stride = 1;
map->use_single_rw = config->use_single_rw;
map->dev = dev;
map->bus = bus;
map->bus_context = bus_context;
@ -686,7 +687,22 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
for (i = 0; i < val_count * val_bytes; i += val_bytes)
map->format.parse_val(wval + i);
}
ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
/*
* Some devices does not support bulk write, for
* them we have a series of single write operations.
*/
if (map->use_single_rw) {
for (i = 0; i < val_count; i++) {
ret = regmap_raw_write(map,
reg + (i * map->reg_stride),
val + (i * val_bytes),
val_bytes);
if (ret != 0)
return ret;
}
} else {
ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
}
if (val_bytes != 1)
kfree(wval);
@ -855,9 +871,25 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
return -EINVAL;
if (vol || map->cache_type == REGCACHE_NONE) {
ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
if (ret != 0)
return ret;
/*
* Some devices does not support bulk read, for
* them we have a series of single read operations.
*/
if (map->use_single_rw) {
for (i = 0; i < val_count; i++) {
ret = regmap_raw_read(map,
reg + (i * map->reg_stride),
val + (i * val_bytes),
val_bytes);
if (ret != 0)
return ret;
}
} else {
ret = regmap_raw_read(map, reg, val,
val_bytes * val_count);
if (ret != 0)
return ret;
}
for (i = 0; i < val_count * val_bytes; i += val_bytes)
map->format.parse_val(val + i);

5
include/linux/regmap.h
View File

@ -76,6 +76,9 @@ struct reg_default {
* @write_flag_mask: Mask to be set in the top byte of the register when doing
* a write. If both read_flag_mask and write_flag_mask are
* empty the regmap_bus default masks are used.
* @use_single_rw: If set, converts the bulk read and write operations into
* a series of single read and write operations. This is useful
* for device that does not support bulk read and write.
*
* @cache_type: The actual cache type.
* @reg_defaults_raw: Power on reset values for registers (for use with
@ -104,6 +107,8 @@ struct regmap_config {
u8 read_flag_mask;
u8 write_flag_mask;
bool use_single_rw;
};
typedef int (*regmap_hw_write)(void *context, const void *data,