1 files changed, 0 insertions, 368 deletions
diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c
deleted file mode 100644
index 7886303eb026..000000000000
--- a/drivers/base/regmap/regcache-lzo.c
+++ /dev/null
@@ -1,368 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-//
-// Register cache access API - LZO caching support
-//
-// Copyright 2011 Wolfson Microelectronics plc
-//
-// Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
-
-#include <linux/device.h>
-#include <linux/lzo.h>
-#include <linux/slab.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 = kcalloc(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 = bitmap_zalloc(bmp_size, GFP_KERNEL);
-	if (!sync_bmp) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	/* 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]) {
-			bitmap_free(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])
-		bitmap_free(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 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);
-	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 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);
-	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 = true;
-		ret = _regmap_write(map, i, val);
-		map->cache_bypass = false;
-		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
-};