[linux.git] / drivers / base / regmap / regcache-lzo.c

/*
 * Register cache access API - LZO caching support
 *
 * Copyright 2011 Wolfson Microelectronics plc
 *
 * Author: Dimitris Papastamos <[email protected]>
 *
 * 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 <linux/device.h>
#include <linux/lzo.h>

#include "internal.h"

static int regcache_lzo_exit(struct regmap *map);

struct regcache_lzo_ctx {
	void *wmem;
	void *dst;
	const void *src;
	size_t src_len;
	size_t dst_len;
	size_t decompressed_size;
	unsigned long *sync_bmp;
	int sync_bmp_nbits;
};

#define LZO_BLOCK_NUM 8
static int regcache_lzo_block_count(struct regmap *map)
{
	return LZO_BLOCK_NUM;
}

static int regcache_lzo_prepare(struct regcache_lzo_ctx *lzo_ctx)
{
	lzo_ctx->wmem = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
	if (!lzo_ctx->wmem)
		return -ENOMEM;
	return 0;
}

static int regcache_lzo_compress(struct regcache_lzo_ctx *lzo_ctx)
{
	size_t compress_size;
	int ret;

	ret = lzo1x_1_compress(lzo_ctx->src, lzo_ctx->src_len,
			       lzo_ctx->dst, &compress_size, lzo_ctx->wmem);
	if (ret != LZO_E_OK || compress_size > lzo_ctx->dst_len)
		return -EINVAL;
	lzo_ctx->dst_len = compress_size;
	return 0;
}

static int regcache_lzo_decompress(struct regcache_lzo_ctx *lzo_ctx)
{
	size_t dst_len;
	int ret;

	dst_len = lzo_ctx->dst_len;
	ret = lzo1x_decompress_safe(lzo_ctx->src, lzo_ctx->src_len,
				    lzo_ctx->dst, &dst_len);
	if (ret != LZO_E_OK || dst_len != lzo_ctx->dst_len)
		return -EINVAL;
	return 0;
}

static int regcache_lzo_compress_cache_block(struct regmap *map,
		struct regcache_lzo_ctx *lzo_ctx)
{
	int ret;

	lzo_ctx->dst_len = lzo1x_worst_compress(PAGE_SIZE);
	lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL);
	if (!lzo_ctx->dst) {
		lzo_ctx->dst_len = 0;
		return -ENOMEM;
	}

	ret = regcache_lzo_compress(lzo_ctx);
	if (ret < 0)
		return ret;
	return 0;
}

static int regcache_lzo_decompress_cache_block(struct regmap *map,
		struct regcache_lzo_ctx *lzo_ctx)
{
	int ret;

	lzo_ctx->dst_len = lzo_ctx->decompressed_size;
	lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL);
	if (!lzo_ctx->dst) {
		lzo_ctx->dst_len = 0;
		return -ENOMEM;
	}

	ret = regcache_lzo_decompress(lzo_ctx);
	if (ret < 0)
		return ret;
	return 0;
}

static inline int regcache_lzo_get_blkindex(struct regmap *map,
					    unsigned int reg)
{
	return ((reg / map->reg_stride) * map->cache_word_size) /
		DIV_ROUND_UP(map->cache_size_raw,
			     regcache_lzo_block_count(map));
}

static inline int regcache_lzo_get_blkpos(struct regmap *map,
					  unsigned int reg)
{
	return (reg / map->reg_stride) %
		    (DIV_ROUND_UP(map->cache_size_raw,
				  regcache_lzo_block_count(map)) /
		     map->cache_word_size);
}

static inline int regcache_lzo_get_blksize(struct regmap *map)
{
	return DIV_ROUND_UP(map->cache_size_raw,
			    regcache_lzo_block_count(map));
}

static int regcache_lzo_init(struct regmap *map)
{
	struct regcache_lzo_ctx **lzo_blocks;
	size_t bmp_size;
	int ret, i, blksize, blkcount;
	const char *p, *end;
	unsigned long *sync_bmp;

	ret = 0;

	blkcount = regcache_lzo_block_count(map);
	map->cache = kzalloc(blkcount * sizeof *lzo_blocks,
			     GFP_KERNEL);
	if (!map->cache)
		return -ENOMEM;
	lzo_blocks = map->cache;

	/*
	 * allocate a bitmap to be used when syncing the cache with
	 * the hardware.  Each time a register is modified, the corresponding
	 * bit is set in the bitmap, so we know that we have to sync
	 * that register.
	 */
	bmp_size = map->num_reg_defaults_raw;
	sync_bmp = kmalloc(BITS_TO_LONGS(bmp_size) * sizeof(long),
			   GFP_KERNEL);
	if (!sync_bmp) {
		ret = -ENOMEM;
		goto err;
	}
	bitmap_zero(sync_bmp, bmp_size);

	/* allocate the lzo blocks and initialize them */
	for (i = 0; i < blkcount; i++) {
		lzo_blocks[i] = kzalloc(sizeof **lzo_blocks,
					GFP_KERNEL);
		if (!lzo_blocks[i]) {
			kfree(sync_bmp);
			ret = -ENOMEM;
			goto err;
		}
		lzo_blocks[i]->sync_bmp = sync_bmp;
		lzo_blocks[i]->sync_bmp_nbits = bmp_size;
		/* alloc the working space for the compressed block */
		ret = regcache_lzo_prepare(lzo_blocks[i]);
		if (ret < 0)
			goto err;
	}

	blksize = regcache_lzo_get_blksize(map);
	p = map->reg_defaults_raw;
	end = map->reg_defaults_raw + map->cache_size_raw;
	/* compress the register map and fill the lzo blocks */
	for (i = 0; i < blkcount; i++, p += blksize) {
		lzo_blocks[i]->src = p;
		if (p + blksize > end)
			lzo_blocks[i]->src_len = end - p;
		else
			lzo_blocks[i]->src_len = blksize;
		ret = regcache_lzo_compress_cache_block(map,
						       lzo_blocks[i]);
		if (ret < 0)
			goto err;
		lzo_blocks[i]->decompressed_size =
			lzo_blocks[i]->src_len;
	}

	return 0;
err:
	regcache_lzo_exit(map);
	return ret;
}

static int regcache_lzo_exit(struct regmap *map)
{
	struct regcache_lzo_ctx **lzo_blocks;
	int i, blkcount;

	lzo_blocks = map->cache;
	if (!lzo_blocks)
		return 0;

	blkcount = regcache_lzo_block_count(map);
	/*
	 * the pointer to the bitmap used for syncing the cache
	 * is shared amongst all lzo_blocks.  Ensure it is freed
	 * only once.
	 */
	if (lzo_blocks[0])
		kfree(lzo_blocks[0]->sync_bmp);
	for (i = 0; i < blkcount; i++) {
		if (lzo_blocks[i]) {
			kfree(lzo_blocks[i]->wmem);
			kfree(lzo_blocks[i]->dst);
		}
		/* each lzo_block is a pointer returned by kmalloc or NULL */
		kfree(lzo_blocks[i]);
	}
	kfree(lzo_blocks);
	map->cache = NULL;
	return 0;
}

static int regcache_lzo_read(struct regmap *map,
			     unsigned int reg, unsigned int *value)
{
	struct regcache_lzo_ctx *lzo_block, **lzo_blocks;
	int ret, blkindex, blkpos;
	size_t blksize, tmp_dst_len;
	void *tmp_dst;

	/* index of the compressed lzo block */
	blkindex = regcache_lzo_get_blkindex(map, reg);
	/* register index within the decompressed block */
	blkpos = regcache_lzo_get_blkpos(map, reg);
	/* size of the compressed block */
	blksize = regcache_lzo_get_blksize(map);
	lzo_blocks = map->cache;
	lzo_block = lzo_blocks[blkindex];

	/* save the pointer and length of the compressed block */
	tmp_dst = lzo_block->dst;
	tmp_dst_len = lzo_block->dst_len;

	/* prepare the source to be the compressed block */
	lzo_block->src = lzo_block->dst;
	lzo_block->src_len = lzo_block->dst_len;

	/* decompress the block */
	ret = regcache_lzo_decompress_cache_block(map, lzo_block);
	if (ret >= 0)
		/* fetch the value from the cache */
		*value = regcache_get_val(map, lzo_block->dst, blkpos);

	kfree(lzo_block->dst);
	/* restore the pointer and length of the compressed block */
	lzo_block->dst = tmp_dst;
	lzo_block->dst_len = tmp_dst_len;

	return ret;
}

static int regcache_lzo_write(struct regmap *map,
			      unsigned int reg, unsigned int value)
{
	struct regcache_lzo_ctx *lzo_block, **lzo_blocks;
	int ret, blkindex, blkpos;
	size_t blksize, tmp_dst_len;
	void *tmp_dst;

	/* index of the compressed lzo block */
	blkindex = regcache_lzo_get_blkindex(map, reg);
	/* register index within the decompressed block */
	blkpos = regcache_lzo_get_blkpos(map, reg);
	/* size of the compressed block */
	blksize = regcache_lzo_get_blksize(map);
	lzo_blocks = map->cache;
	lzo_block = lzo_blocks[blkindex];

	/* save the pointer and length of the compressed block */
	tmp_dst = lzo_block->dst;
	tmp_dst_len = lzo_block->dst_len;

	/* prepare the source to be the compressed block */
	lzo_block->src = lzo_block->dst;
	lzo_block->src_len = lzo_block->dst_len;

	/* decompress the block */
	ret = regcache_lzo_decompress_cache_block(map, lzo_block);
	if (ret < 0) {
		kfree(lzo_block->dst);
		goto out;
	}

	/* write the new value to the cache */
	if (regcache_set_val(map, lzo_block->dst, blkpos, value)) {
		kfree(lzo_block->dst);
		goto out;
	}

	/* prepare the source to be the decompressed block */
	lzo_block->src = lzo_block->dst;
	lzo_block->src_len = lzo_block->dst_len;

	/* compress the block */
	ret = regcache_lzo_compress_cache_block(map, lzo_block);
	if (ret < 0) {
		kfree(lzo_block->dst);
		kfree(lzo_block->src);
		goto out;
	}

	/* set the bit so we know we have to sync this register */
	set_bit(reg / map->reg_stride, lzo_block->sync_bmp);
	kfree(tmp_dst);
	kfree(lzo_block->src);
	return 0;
out:
	lzo_block->dst = tmp_dst;
	lzo_block->dst_len = tmp_dst_len;
	return ret;
}

static int regcache_lzo_sync(struct regmap *map, unsigned int min,
			     unsigned int max)
{
	struct regcache_lzo_ctx **lzo_blocks;
	unsigned int val;
	int i;
	int ret;

	lzo_blocks = map->cache;
	i = min;
	for_each_set_bit_from(i, lzo_blocks[0]->sync_bmp,
			      lzo_blocks[0]->sync_bmp_nbits) {
		if (i > max)
			continue;

		ret = regcache_read(map, i, &val);
		if (ret)
			return ret;

		/* Is this the hardware default?  If so skip. */
		ret = regcache_lookup_reg(map, i);
		if (ret > 0 && val == map->reg_defaults[ret].def)
			continue;

		map->cache_bypass = 1;
		ret = _regmap_write(map, i, val);
		map->cache_bypass = 0;
		if (ret)
			return ret;
		dev_dbg(map->dev, "Synced register %#x, value %#x\n",
			i, val);
	}

	return 0;
}

struct regcache_ops regcache_lzo_ops = {
	.type = REGCACHE_COMPRESSED,
	.name = "lzo",
	.init = regcache_lzo_init,
	.exit = regcache_lzo_exit,
	.read = regcache_lzo_read,
	.write = regcache_lzo_write,
	.sync = regcache_lzo_sync
};
Commit	Line	Data
2cbbb579 DP	1	/*
	2	* Register cache access API - LZO caching support
	3	*
	4	* Copyright 2011 Wolfson Microelectronics plc
	5	*
	6	* Author: Dimitris Papastamos <[email protected]>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/slab.h>
51990e82	14	#include <linux/device.h>
2cbbb579 DP	15	#include <linux/lzo.h>
	16
	17	#include "internal.h"
	18
c2b1ecd1 LPC	19	static int regcache_lzo_exit(struct regmap *map);
c2b1ecd1 LPC	20
2cbbb579 DP	21	struct regcache_lzo_ctx {
	22	void *wmem;
	23	void *dst;
	24	const void *src;
	25	size_t src_len;
	26	size_t dst_len;
	27	size_t decompressed_size;
	28	unsigned long *sync_bmp;
	29	int sync_bmp_nbits;
	30	};
	31
	32	#define LZO_BLOCK_NUM 8
82732bdd	33	static int regcache_lzo_block_count(struct regmap *map)
2cbbb579 DP	34	{
	35	return LZO_BLOCK_NUM;
	36	}
	37
	38	static int regcache_lzo_prepare(struct regcache_lzo_ctx *lzo_ctx)
	39	{
	40	lzo_ctx->wmem = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
	41	if (!lzo_ctx->wmem)
	42	return -ENOMEM;
	43	return 0;
	44	}
	45
	46	static int regcache_lzo_compress(struct regcache_lzo_ctx *lzo_ctx)
	47	{
	48	size_t compress_size;
	49	int ret;
	50
	51	ret = lzo1x_1_compress(lzo_ctx->src, lzo_ctx->src_len,
	52	lzo_ctx->dst, &compress_size, lzo_ctx->wmem);
	53	if (ret != LZO_E_OK \|\| compress_size > lzo_ctx->dst_len)
	54	return -EINVAL;
	55	lzo_ctx->dst_len = compress_size;
	56	return 0;
	57	}
	58
	59	static int regcache_lzo_decompress(struct regcache_lzo_ctx *lzo_ctx)
	60	{
	61	size_t dst_len;
	62	int ret;
	63
	64	dst_len = lzo_ctx->dst_len;
	65	ret = lzo1x_decompress_safe(lzo_ctx->src, lzo_ctx->src_len,
	66	lzo_ctx->dst, &dst_len);
	67	if (ret != LZO_E_OK \|\| dst_len != lzo_ctx->dst_len)
	68	return -EINVAL;
	69	return 0;
	70	}
	71
	72	static int regcache_lzo_compress_cache_block(struct regmap *map,
	73	struct regcache_lzo_ctx *lzo_ctx)
	74	{
	75	int ret;
	76
	77	lzo_ctx->dst_len = lzo1x_worst_compress(PAGE_SIZE);
	78	lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL);
	79	if (!lzo_ctx->dst) {
	80	lzo_ctx->dst_len = 0;
	81	return -ENOMEM;
	82	}
	83
	84	ret = regcache_lzo_compress(lzo_ctx);
	85	if (ret < 0)
	86	return ret;
	87	return 0;
	88	}
	89
	90	static int regcache_lzo_decompress_cache_block(struct regmap *map,
	91	struct regcache_lzo_ctx *lzo_ctx)
	92	{
	93	int ret;
	94
	95	lzo_ctx->dst_len = lzo_ctx->decompressed_size;
	96	lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL);
	97	if (!lzo_ctx->dst) {
98	lzo_ctx->dst_len = 0;
99	return -ENOMEM;
100	}
101
102	ret = regcache_lzo_decompress(lzo_ctx);
103	if (ret < 0)
104	return ret;
105	return 0;
106	}
107
108	static inline int regcache_lzo_get_blkindex(struct regmap *map,
109	unsigned int reg)
110	{
f01ee60f	111	return ((reg / map->reg_stride) * map->cache_word_size) /
82732bdd MB	112	DIV_ROUND_UP(map->cache_size_raw,
82732bdd MB	113	regcache_lzo_block_count(map));
2cbbb579 DP	114	}
	115
	116	static inline int regcache_lzo_get_blkpos(struct regmap *map,
	117	unsigned int reg)
	118	{
f01ee60f SW	119	return (reg / map->reg_stride) %
	120	(DIV_ROUND_UP(map->cache_size_raw,
	121	regcache_lzo_block_count(map)) /
	122	map->cache_word_size);
2cbbb579 DP	123	}
	124
	125	static inline int regcache_lzo_get_blksize(struct regmap *map)
	126	{
82732bdd MB	127	return DIV_ROUND_UP(map->cache_size_raw,
82732bdd MB	128	regcache_lzo_block_count(map));
2cbbb579 DP	129	}
	130
	131	static int regcache_lzo_init(struct regmap *map)
	132	{
	133	struct regcache_lzo_ctx **lzo_blocks;
	134	size_t bmp_size;
	135	int ret, i, blksize, blkcount;
	136	const char p, end;
	137	unsigned long *sync_bmp;
	138
	139	ret = 0;
	140
82732bdd	141	blkcount = regcache_lzo_block_count(map);
2cbbb579 DP	142	map->cache = kzalloc(blkcount * sizeof *lzo_blocks,
	143	GFP_KERNEL);
	144	if (!map->cache)
	145	return -ENOMEM;
	146	lzo_blocks = map->cache;
	147
	148	/*
	149	* allocate a bitmap to be used when syncing the cache with
	150	* the hardware. Each time a register is modified, the corresponding
	151	* bit is set in the bitmap, so we know that we have to sync
	152	* that register.
	153	*/
	154	bmp_size = map->num_reg_defaults_raw;
	155	sync_bmp = kmalloc(BITS_TO_LONGS(bmp_size) * sizeof(long),
	156	GFP_KERNEL);
	157	if (!sync_bmp) {
	158	ret = -ENOMEM;
	159	goto err;
	160	}
	161	bitmap_zero(sync_bmp, bmp_size);
	162
	163	/* allocate the lzo blocks and initialize them */
	164	for (i = 0; i < blkcount; i++) {
	165	lzo_blocks[i] = kzalloc(sizeof **lzo_blocks,
	166	GFP_KERNEL);
	167	if (!lzo_blocks[i]) {
	168	kfree(sync_bmp);
	169	ret = -ENOMEM;
	170	goto err;
	171	}
	172	lzo_blocks[i]->sync_bmp = sync_bmp;
	173	lzo_blocks[i]->sync_bmp_nbits = bmp_size;
	174	/* alloc the working space for the compressed block */
	175	ret = regcache_lzo_prepare(lzo_blocks[i]);
	176	if (ret < 0)
	177	goto err;
	178	}
	179
	180	blksize = regcache_lzo_get_blksize(map);
	181	p = map->reg_defaults_raw;
	182	end = map->reg_defaults_raw + map->cache_size_raw;
	183	/* compress the register map and fill the lzo blocks */
	184	for (i = 0; i < blkcount; i++, p += blksize) {
	185	lzo_blocks[i]->src = p;
	186	if (p + blksize > end)
	187	lzo_blocks[i]->src_len = end - p;
	188	else
	189	lzo_blocks[i]->src_len = blksize;
	190	ret = regcache_lzo_compress_cache_block(map,
	191	lzo_blocks[i]);
	192	if (ret < 0)
	193	goto err;
	194	lzo_blocks[i]->decompressed_size =
	195	lzo_blocks[i]->src_len;
	196	}
	197
	198	return 0;
	199	err:
c2b1ecd1	200	regcache_lzo_exit(map);
2cbbb579 DP	201	return ret;
	202	}
	203
	204	static int regcache_lzo_exit(struct regmap *map)
	205	{
	206	struct regcache_lzo_ctx **lzo_blocks;
	207	int i, blkcount;
	208
	209	lzo_blocks = map->cache;
	210	if (!lzo_blocks)
	211	return 0;
	212
82732bdd	213	blkcount = regcache_lzo_block_count(map);
2cbbb579 DP	214	/*
	215	* the pointer to the bitmap used for syncing the cache
	216	* is shared amongst all lzo_blocks. Ensure it is freed
	217	* only once.
	218	*/
	219	if (lzo_blocks[0])
	220	kfree(lzo_blocks[0]->sync_bmp);
	221	for (i = 0; i < blkcount; i++) {
	222	if (lzo_blocks[i]) {
	223	kfree(lzo_blocks[i]->wmem);
	224	kfree(lzo_blocks[i]->dst);
	225	}
	226	/* each lzo_block is a pointer returned by kmalloc or NULL */
	227	kfree(lzo_blocks[i]);
	228	}
	229	kfree(lzo_blocks);
	230	map->cache = NULL;
	231	return 0;
	232	}
	233
	234	static int regcache_lzo_read(struct regmap *map,
	235	unsigned int reg, unsigned int *value)
	236	{
	237	struct regcache_lzo_ctx lzo_block, *lzo_blocks;
	238	int ret, blkindex, blkpos;
	239	size_t blksize, tmp_dst_len;
	240	void *tmp_dst;
	241
2cbbb579 DP	242	/* index of the compressed lzo block */
	243	blkindex = regcache_lzo_get_blkindex(map, reg);
	244	/* register index within the decompressed block */
	245	blkpos = regcache_lzo_get_blkpos(map, reg);
	246	/* size of the compressed block */
	247	blksize = regcache_lzo_get_blksize(map);
	248	lzo_blocks = map->cache;
	249	lzo_block = lzo_blocks[blkindex];
	250
	251	/* save the pointer and length of the compressed block */
	252	tmp_dst = lzo_block->dst;
	253	tmp_dst_len = lzo_block->dst_len;
	254
	255	/* prepare the source to be the compressed block */
	256	lzo_block->src = lzo_block->dst;
	257	lzo_block->src_len = lzo_block->dst_len;
	258
	259	/* decompress the block */
	260	ret = regcache_lzo_decompress_cache_block(map, lzo_block);
	261	if (ret >= 0)
	262	/* fetch the value from the cache */
879082c9	263	*value = regcache_get_val(map, lzo_block->dst, blkpos);
2cbbb579 DP	264
	265	kfree(lzo_block->dst);
	266	/* restore the pointer and length of the compressed block */
	267	lzo_block->dst = tmp_dst;
	268	lzo_block->dst_len = tmp_dst_len;
6e6ace00 MB	269
6e6ace00 MB	270	return ret;
2cbbb579 DP	271	}
	272
	273	static int regcache_lzo_write(struct regmap *map,
	274	unsigned int reg, unsigned int value)
	275	{
	276	struct regcache_lzo_ctx lzo_block, *lzo_blocks;
	277	int ret, blkindex, blkpos;
	278	size_t blksize, tmp_dst_len;
	279	void *tmp_dst;
	280
	281	/* index of the compressed lzo block */
	282	blkindex = regcache_lzo_get_blkindex(map, reg);
	283	/* register index within the decompressed block */
	284	blkpos = regcache_lzo_get_blkpos(map, reg);
	285	/* size of the compressed block */
	286	blksize = regcache_lzo_get_blksize(map);
	287	lzo_blocks = map->cache;
	288	lzo_block = lzo_blocks[blkindex];
	289
	290	/* save the pointer and length of the compressed block */
	291	tmp_dst = lzo_block->dst;
	292	tmp_dst_len = lzo_block->dst_len;
	293
	294	/* prepare the source to be the compressed block */
	295	lzo_block->src = lzo_block->dst;
	296	lzo_block->src_len = lzo_block->dst_len;
	297
	298	/* decompress the block */
	299	ret = regcache_lzo_decompress_cache_block(map, lzo_block);
	300	if (ret < 0) {
	301	kfree(lzo_block->dst);
	302	goto out;
	303	}
	304
	305	/* write the new value to the cache */
879082c9	306	if (regcache_set_val(map, lzo_block->dst, blkpos, value)) {
2cbbb579 DP	307	kfree(lzo_block->dst);
	308	goto out;
	309	}
	310
	311	/* prepare the source to be the decompressed block */
	312	lzo_block->src = lzo_block->dst;
	313	lzo_block->src_len = lzo_block->dst_len;
	314
	315	/* compress the block */
	316	ret = regcache_lzo_compress_cache_block(map, lzo_block);
	317	if (ret < 0) {
	318	kfree(lzo_block->dst);
	319	kfree(lzo_block->src);
	320	goto out;
	321	}
	322
	323	/* set the bit so we know we have to sync this register */
f01ee60f	324	set_bit(reg / map->reg_stride, lzo_block->sync_bmp);
2cbbb579 DP	325	kfree(tmp_dst);
	326	kfree(lzo_block->src);
	327	return 0;
	328	out:
	329	lzo_block->dst = tmp_dst;
	330	lzo_block->dst_len = tmp_dst_len;
	331	return ret;
	332	}
	333
ac8d91c8 MB	334	static int regcache_lzo_sync(struct regmap *map, unsigned int min,
ac8d91c8 MB	335	unsigned int max)
2cbbb579 DP	336	{
	337	struct regcache_lzo_ctx **lzo_blocks;
	338	unsigned int val;
	339	int i;
	340	int ret;
	341
	342	lzo_blocks = map->cache;
ac8d91c8	343	i = min;
0a329d2d	344	for_each_set_bit_from(i, lzo_blocks[0]->sync_bmp,
ac8d91c8 MB	345	lzo_blocks[0]->sync_bmp_nbits) {
	346	if (i > max)
	347	continue;
	348
2cbbb579 DP	349	ret = regcache_read(map, i, &val);
	350	if (ret)
	351	return ret;
a3c37741 MB	352
	353	/* Is this the hardware default? If so skip. */
	354	ret = regcache_lookup_reg(map, i);
	355	if (ret > 0 && val == map->reg_defaults[ret].def)
	356	continue;
	357
2cbbb579	358	map->cache_bypass = 1;
13753a90	359	ret = _regmap_write(map, i, val);
2cbbb579 DP	360	map->cache_bypass = 0;
	361	if (ret)
	362	return ret;
	363	dev_dbg(map->dev, "Synced register %#x, value %#x\n",
	364	i, val);
	365	}
	366
	367	return 0;
	368	}
	369
	370	struct regcache_ops regcache_lzo_ops = {
50b776fc	371	.type = REGCACHE_COMPRESSED,
2cbbb579 DP	372	.name = "lzo",
	373	.init = regcache_lzo_init,
	374	.exit = regcache_lzo_exit,
	375	.read = regcache_lzo_read,
	376	.write = regcache_lzo_write,
	377	.sync = regcache_lzo_sync
	378	};