admin/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2025-12-07 20:06:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

regmap: ram: support noinc semantics

Browse Source 
Support noinc semantics in RAM backed regmaps, for testing purposes. Add
a new callback that selects registers which should have noinc behavior.
Bulk writes to a noinc register will cause the last value in the buffer
to be assigned to the register, while bulk reads will copy the same
value repeatedly into the buffer.

This patch only adds support to regmap-raw-ram, since regmap-ram does
not support bulk operations.

Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Link: https://lore.kernel.org/r/20231102203039.3069305-1-ben.wolsieffer@hefring.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ben Wolsieffer
2023-11-02 16:30:38 -04:00
committed by Mark Brown
parent b85ea95d08
commit 02e3564a34
2 changed files with 18 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/base/regmap/internal.h
View File

@@ -318,6 +318,7 @@ struct regmap_ram_data {
bool *read;
bool *written;
enum regmap_endian reg_endian;
bool (*noinc_reg)(struct regmap_ram_data *data, unsigned int reg);
};
/*

23
drivers/base/regmap/regmap-raw-ram.c
View File

@@ -41,10 +41,15 @@ static int regmap_raw_ram_gather_write(void *context,
return -EINVAL;
r = decode_reg(data->reg_endian, reg);
memcpy(&our_buf[r], val, val_len);
if (data->noinc_reg && data->noinc_reg(data, r)) {
memcpy(&our_buf[r], val + val_len - 2, 2);
data->written[r] = true;
} else {
memcpy(&our_buf[r], val, val_len);
for (i = 0; i < val_len / 2; i++)
data->written[r + i] = true;
for (i = 0; i < val_len / 2; i++)
data->written[r + i] = true;
}
return 0;
}
@@ -70,10 +75,16 @@ static int regmap_raw_ram_read(void *context,
return -EINVAL;
r = decode_reg(data->reg_endian, reg);
memcpy(val, &our_buf[r], val_len);
if (data->noinc_reg && data->noinc_reg(data, r)) {
for (i = 0; i < val_len; i += 2)
memcpy(val + i, &our_buf[r], 2);
data->read[r] = true;
} else {
memcpy(val, &our_buf[r], val_len);
for (i = 0; i < val_len / 2; i++)
data->read[r + i] = true;
for (i = 0; i < val_len / 2; i++)
data->read[r + i] = true;
}
return 0;
}