12ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown/*
22ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown * Register cache access API - flat caching support
32ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown *
42ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown * Copyright 2012 Wolfson Microelectronics plc
52ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown *
62ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
72ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown *
82ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown * This program is free software; you can redistribute it and/or modify
92ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown * it under the terms of the GNU General Public License version 2 as
102ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown * published by the Free Software Foundation.
112ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown */
122ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
132ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown#include <linux/slab.h>
142ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown#include <linux/device.h>
152ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown#include <linux/seq_file.h>
162ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
172ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown#include "internal.h"
182ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
192ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brownstatic int regcache_flat_init(struct regmap *map)
202ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown{
212ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	int i;
222ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	unsigned int *cache;
232ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
242ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	map->cache = kzalloc(sizeof(unsigned int) * (map->max_register + 1),
252ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown			     GFP_KERNEL);
262ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	if (!map->cache)
272ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown		return -ENOMEM;
282ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
292ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	cache = map->cache;
302ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
312ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	for (i = 0; i < map->num_reg_defaults; i++)
322ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown		cache[map->reg_defaults[i].reg] = map->reg_defaults[i].def;
332ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
342ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	return 0;
352ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown}
362ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
372ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brownstatic int regcache_flat_exit(struct regmap *map)
382ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown{
392ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	kfree(map->cache);
402ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	map->cache = NULL;
412ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
422ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	return 0;
432ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown}
442ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
452ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brownstatic int regcache_flat_read(struct regmap *map,
462ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown			      unsigned int reg, unsigned int *value)
472ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown{
482ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	unsigned int *cache = map->cache;
492ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
502ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	*value = cache[reg];
512ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
522ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	return 0;
532ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown}
542ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
552ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brownstatic int regcache_flat_write(struct regmap *map, unsigned int reg,
562ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown			       unsigned int value)
572ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown{
582ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	unsigned int *cache = map->cache;
592ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
602ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	cache[reg] = value;
612ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
622ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	return 0;
632ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown}
642ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown
652ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brownstruct regcache_ops regcache_flat_ops = {
662ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	.type = REGCACHE_FLAT,
672ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	.name = "flat",
682ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	.init = regcache_flat_init,
692ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	.exit = regcache_flat_exit,
702ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	.read = regcache_flat_read,
712ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown	.write = regcache_flat_write,
722ac902ce17f9dfa0d4d1f0818be147b5d2515fb7Mark Brown};
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