2ac902ce17
While for I2C and SPI devices the overhead of using rbtree for devices with only one block of registers is negligible the same isn't always going to be true for MMIO devices where the I/O costs are very much lower. Cater for these devices by adding a simple flat array type for them where the lookups are simple array accesses, taking us right back to the original ASoC cache implementation. Thanks to Magnus Damm for the discussion which prompted this. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
/*
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* Register cache access API - flat caching support
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*
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* Copyright 2012 Wolfson Microelectronics plc
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static int regcache_flat_init(struct regmap *map)
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{
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int i;
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unsigned int *cache;
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map->cache = kzalloc(sizeof(unsigned int) * (map->max_register + 1),
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GFP_KERNEL);
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if (!map->cache)
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return -ENOMEM;
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cache = map->cache;
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for (i = 0; i < map->num_reg_defaults; i++)
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cache[map->reg_defaults[i].reg] = map->reg_defaults[i].def;
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return 0;
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}
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static int regcache_flat_exit(struct regmap *map)
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{
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kfree(map->cache);
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map->cache = NULL;
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return 0;
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}
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static int regcache_flat_read(struct regmap *map,
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unsigned int reg, unsigned int *value)
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{
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unsigned int *cache = map->cache;
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*value = cache[reg];
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return 0;
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}
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static int regcache_flat_write(struct regmap *map, unsigned int reg,
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unsigned int value)
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{
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unsigned int *cache = map->cache;
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cache[reg] = value;
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return 0;
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}
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struct regcache_ops regcache_flat_ops = {
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.type = REGCACHE_FLAT,
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.name = "flat",
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.init = regcache_flat_init,
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.exit = regcache_flat_exit,
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.read = regcache_flat_read,
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.write = regcache_flat_write,
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};
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