diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-10-04 21:20:18 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-10-15 05:00:00 +0400 |
| commit | 8a2ceac6617a67d8a1ee4bd255743d577bde311a (patch) | |
| tree | 3d930e91d65fb6ccf22bc7cdfd2de168ce3eb0f1 /drivers/base | |
| parent | 0ff3e62ff119f2b65b0a8ad48fcb669f609fd904 (diff) | |
| download | linux-8a2ceac6617a67d8a1ee4bd255743d577bde311a.tar.xz | |
regmap: Split raw writes that cross window boundaries
If a block write covers a paged memory region and crosses a window
boundary then rather than failing the write split the transfer up
into multiple writes, making the whole process more transparent for
drivers.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index baf9586b4fd8..96253cd949e9 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -852,8 +852,30 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg, range = _regmap_range_lookup(map, reg); if (range) { - ret = _regmap_select_page(map, ®, range, - val_len / map->format.val_bytes); + int val_num = val_len / map->format.val_bytes; + int win_offset = (reg - range->range_min) % range->window_len; + int win_residue = range->window_len - win_offset; + + /* If the write goes beyond the end of the window split it */ + while (val_num > win_residue) { + dev_dbg(map->dev, "Writing window %d/%d\n", + win_residue, val_len / map->format.val_bytes); + ret = _regmap_raw_write(map, reg, val, win_residue * + map->format.val_bytes); + if (ret != 0) + return ret; + + reg += win_residue; + val_num -= win_residue; + val += win_residue * map->format.val_bytes; + val_len -= win_residue * map->format.val_bytes; + + win_offset = (reg - range->range_min) % + range->window_len; + win_residue = range->window_len - win_offset; + } + + ret = _regmap_select_page(map, ®, range, val_num); if (ret != 0) return ret; } |