6e6ace00a0
If a register isn't cached then let callers know that so they can fall back or error handle appropriately. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
|
|
* 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
|
|
};
|