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regmap: Support reading from specific range

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It is useful to be able to treat the different ranges of a regmap
separately to be able to use distinct offset for them, but this is
currently not implemented in the regmap API.

To preserve backwards compatibility, add regmap_read_range and
regmap_write_range functions that take an additional parameter
'range_num' that identifies the range to operate on.

Reviewed-by: Anatolij Gustschin <agust@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Mario Six <mario.six@gdsys.cc>
This commit is contained in:
Mario Six 2018-10-15 09:24:11 +02:00 committed by Simon Glass
parent 84ff8f622d
commit d5c7bd985d
2 changed files with 75 additions and 5 deletions
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49
drivers/core/regmap.c
View File

@ -188,11 +188,25 @@ int regmap_uninit(struct regmap *map)
return 0;
}
int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
void *valp, size_t val_len)
{
struct regmap_range *range;
void *ptr;
ptr = map_physmem(map->ranges[0].start + offset, val_len, MAP_NOCACHE);
if (range_num >= map->range_count) {
debug("%s: range index %d larger than range count\n",
__func__, range_num);
return -ERANGE;
}
range = &map->ranges[range_num];
ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
if (offset + val_len > range->size) {
debug("%s: offset/size combination invalid\n", __func__);
return -ERANGE;
}
switch (val_len) {
case REGMAP_SIZE_8:
@ -213,20 +227,39 @@ int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
debug("%s: regmap size %zu unknown\n", __func__, val_len);
return -EINVAL;
}
return 0;
}
int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
{
return regmap_raw_read_range(map, 0, offset, valp, val_len);
}
int regmap_read(struct regmap *map, uint offset, uint *valp)
{
return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32);
}
int regmap_raw_write(struct regmap *map, uint offset, const void *val,
size_t val_len)
int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
const void *val, size_t val_len)
{
struct regmap_range *range;
void *ptr;
ptr = map_physmem(map->ranges[0].start + offset, val_len, MAP_NOCACHE);
if (range_num >= map->range_count) {
debug("%s: range index %d larger than range count\n",
__func__, range_num);
return -ERANGE;
}
range = &map->ranges[range_num];
ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
if (offset + val_len > range->size) {
debug("%s: offset/size combination invalid\n", __func__);
return -ERANGE;
}
switch (val_len) {
case REGMAP_SIZE_8:
@ -251,6 +284,12 @@ int regmap_raw_write(struct regmap *map, uint offset, const void *val,
return 0;
}
int regmap_raw_write(struct regmap *map, uint offset, const void *val,
size_t val_len)
{
return regmap_raw_write_range(map, 0, offset, val, val_len);
}
int regmap_write(struct regmap *map, uint offset, uint val)
{
return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32);

31
include/regmap.h
View File

@ -115,6 +115,37 @@ int regmap_raw_write(struct regmap *map, uint offset, const void *val,
int regmap_raw_read(struct regmap *map, uint offset, void *valp,
size_t val_len);
/**
* regmap_raw_write_range() - Write a value of specified length to a range of a
* regmap
*
* @map: Regmap to write to
* @range_num: Number of the range in the regmap to write to
* @offset: Offset in the regmap to write to
* @val: Value to write to the regmap at the specified offset
* @val_len: Length of the data to be written to the regmap
*
* Return: 0 if OK, -ve on error
*/
int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
const void *val, size_t val_len);
/**
* regmap_raw_read_range() - Read a value of specified length from a range of a
* regmap
*
* @map: Regmap to read from
* @range_num: Number of the range in the regmap to write to
* @offset: Offset in the regmap to read from
* @valp: Pointer to the buffer to receive the data read from the regmap
* at the specified offset
* @val_len: Length of the data to be read from the regmap
*
* Return: 0 if OK, -ve on error
*/
int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
void *valp, size_t val_len);
#define regmap_write32(map, ptr, member, val) \
regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)