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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-25 11:57:45 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-25 11:57:45 (GMT) |
commit | 4e7e2a2008f5d8c49791c412849d5b0232d39bb3 (patch) | |
tree | 32c3fa2d5cefb388689cb795225022769bf7b413 /drivers/base/regmap/regcache-indexed.c | |
parent | 8a9ea3237e7eb5c25f09e429ad242ae5a3d5ea22 (diff) | |
parent | 7cccbdc84487616c3dbe493b04bfa1f362f4bc56 (diff) | |
download | linux-fsl-qoriq-4e7e2a2008f5d8c49791c412849d5b0232d39bb3.tar.xz |
Merge branch 'for-linus' of git://opensource.wolfsonmicro.com/regmap
* 'for-linus' of git://opensource.wolfsonmicro.com/regmap: (62 commits)
mfd: Enable rbtree cache for wm831x devices
regmap: Support some block operations on cached devices
regmap: Allow caches for devices with no defaults
regmap: Ensure rbtree syncs registers set to zero properly
regmap: Allow rbtree to cache zero default values
regmap: Warn on raw I/O as well as bulk reads that bypass cache
regmap: Return a sensible error code if we fail to read the cache
regmap: Use bsearch() to search the register defaults
regmap: Fix doc comment
regmap: Optimize the lookup path to use binary search
regmap: Ensure we scream if we enable cache bypass/only at the same time
regmap: Implement regcache_cache_bypass helper function
regmap: Save/restore the bypass state upon syncing
regmap: Lock the sync path, ensure we use the lockless _regmap_write()
regmap: Fix apostrophe usage
regmap: Make _regmap_write() global
regmap: Fix lock used for regcache_cache_only()
regmap: Grab the lock in regcache_cache_only()
regmap: Modify map->cache_bypass directly
regmap: Fix regcache_sync generic implementation
...
Diffstat (limited to 'drivers/base/regmap/regcache-indexed.c')
-rw-r--r-- | drivers/base/regmap/regcache-indexed.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/base/regmap/regcache-indexed.c b/drivers/base/regmap/regcache-indexed.c new file mode 100644 index 0000000..507731a --- /dev/null +++ b/drivers/base/regmap/regcache-indexed.c @@ -0,0 +1,64 @@ +/* + * Register cache access API - indexed caching support + * + * Copyright 2011 Wolfson Microelectronics plc + * + * Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/slab.h> + +#include "internal.h" + +static int regcache_indexed_read(struct regmap *map, unsigned int reg, + unsigned int *value) +{ + int ret; + + ret = regcache_lookup_reg(map, reg); + if (ret >= 0) + *value = map->reg_defaults[ret].def; + + return ret; +} + +static int regcache_indexed_write(struct regmap *map, unsigned int reg, + unsigned int value) +{ + int ret; + + ret = regcache_lookup_reg(map, reg); + if (ret < 0) + return regcache_insert_reg(map, reg, value); + map->reg_defaults[ret].def = value; + return 0; +} + +static int regcache_indexed_sync(struct regmap *map) +{ + unsigned int i; + int ret; + + for (i = 0; i < map->num_reg_defaults; i++) { + ret = _regmap_write(map, map->reg_defaults[i].reg, + map->reg_defaults[i].def); + if (ret < 0) + return ret; + dev_dbg(map->dev, "Synced register %#x, value %#x\n", + map->reg_defaults[i].reg, + map->reg_defaults[i].def); + } + return 0; +} + +struct regcache_ops regcache_indexed_ops = { + .type = REGCACHE_INDEXED, + .name = "indexed", + .read = regcache_indexed_read, + .write = regcache_indexed_write, + .sync = regcache_indexed_sync +}; |