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Commit 195af65c authored by Dimitris Papastamos's avatar Dimitris Papastamos Committed by Mark Brown
Browse files

regmap: Add the indexed cache support 



This is the simplest form of a cache available in regcache.  Any
registers whose default value is 0 are ignored.  If any of those
registers are modified in the future, they will be placed in the
cache on demand.  The cache layout is essentially using the provided
register defaults by the regcache core directly and does not re-map
it to another representation.

Signed-off-by: default avatarDimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 9fabe24e

drivers/base/regmap/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-$(CONFIG_REGMAP) += regmap.o regcache.o

obj-$(CONFIG_REGMAP) += regmap.o regcache.o regcache-indexed.o

obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o

obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o

obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o

drivers/base/regmap/internal.h

+1 −0
Original line number Diff line number Diff line
@@ -118,4 +118,5 @@ int regcache_lookup_reg(struct regmap *map, unsigned int reg); 
int regcache_insert_reg(struct regmap *map, unsigned int reg,

			unsigned int val);



extern struct regcache_ops regcache_indexed_ops;

#endif

drivers/base/regmap/regcache-indexed.c

0 → 100644
+65 −0
Original line number Diff line number Diff line 
/*

 * 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 = 0;

	else

		*value = map->reg_defaults[ret].def;

	return 0;

}



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)

{

	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

};

drivers/base/regmap/regcache.c

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include "internal.h"



static const struct regcache_ops *cache_types[] = {

	&regcache_indexed_ops,

};



static int regcache_hw_init(struct regmap *map)

include/linux/regmap.h

+1 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ struct spi_device; 
/* An enum of all the supported cache types */

enum regcache_type {

	REGCACHE_NONE,

	REGCACHE_INDEXED,

};



/**