84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// Register cache access API - flat caching support
|
|
//
|
|
// Copyright 2012 Wolfson Microelectronics plc
|
|
//
|
|
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static inline unsigned int regcache_flat_get_index(const struct regmap *map,
|
|
unsigned int reg)
|
|
{
|
|
return regcache_get_index_by_order(map, reg);
|
|
}
|
|
|
|
static int regcache_flat_init(struct regmap *map)
|
|
{
|
|
int i;
|
|
unsigned int *cache;
|
|
|
|
if (!map || map->reg_stride_order < 0 || !map->max_register)
|
|
return -EINVAL;
|
|
|
|
map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
|
|
+ 1, sizeof(unsigned int), GFP_KERNEL);
|
|
if (!map->cache)
|
|
return -ENOMEM;
|
|
|
|
cache = map->cache;
|
|
|
|
for (i = 0; i < map->num_reg_defaults; i++) {
|
|
unsigned int reg = map->reg_defaults[i].reg;
|
|
unsigned int index = regcache_flat_get_index(map, reg);
|
|
|
|
cache[index] = map->reg_defaults[i].def;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int regcache_flat_exit(struct regmap *map)
|
|
{
|
|
kfree(map->cache);
|
|
map->cache = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int regcache_flat_read(struct regmap *map,
|
|
unsigned int reg, unsigned int *value)
|
|
{
|
|
unsigned int *cache = map->cache;
|
|
unsigned int index = regcache_flat_get_index(map, reg);
|
|
|
|
*value = cache[index];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int regcache_flat_write(struct regmap *map, unsigned int reg,
|
|
unsigned int value)
|
|
{
|
|
unsigned int *cache = map->cache;
|
|
unsigned int index = regcache_flat_get_index(map, reg);
|
|
|
|
cache[index] = value;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct regcache_ops regcache_flat_ops = {
|
|
.type = REGCACHE_FLAT,
|
|
.name = "flat",
|
|
.init = regcache_flat_init,
|
|
.exit = regcache_flat_exit,
|
|
.read = regcache_flat_read,
|
|
.write = regcache_flat_write,
|
|
};
|