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368 lines
8.7 KiB
368 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Register cache access API - LZO caching support |
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// |
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// Copyright 2011 Wolfson Microelectronics plc |
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// |
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// Author: Dimitris Papastamos <[email protected]> |
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#include <linux/device.h> |
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#include <linux/lzo.h> |
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#include <linux/slab.h> |
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#include "internal.h" |
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static int regcache_lzo_exit(struct regmap *map); |
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struct regcache_lzo_ctx { |
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void *wmem; |
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void *dst; |
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const void *src; |
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size_t src_len; |
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size_t dst_len; |
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size_t decompressed_size; |
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unsigned long *sync_bmp; |
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int sync_bmp_nbits; |
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}; |
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#define LZO_BLOCK_NUM 8 |
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static int regcache_lzo_block_count(struct regmap *map) |
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{ |
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return LZO_BLOCK_NUM; |
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} |
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static int regcache_lzo_prepare(struct regcache_lzo_ctx *lzo_ctx) |
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{ |
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lzo_ctx->wmem = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL); |
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if (!lzo_ctx->wmem) |
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return -ENOMEM; |
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return 0; |
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} |
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static int regcache_lzo_compress(struct regcache_lzo_ctx *lzo_ctx) |
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{ |
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size_t compress_size; |
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int ret; |
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ret = lzo1x_1_compress(lzo_ctx->src, lzo_ctx->src_len, |
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lzo_ctx->dst, &compress_size, lzo_ctx->wmem); |
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if (ret != LZO_E_OK || compress_size > lzo_ctx->dst_len) |
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return -EINVAL; |
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lzo_ctx->dst_len = compress_size; |
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return 0; |
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} |
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static int regcache_lzo_decompress(struct regcache_lzo_ctx *lzo_ctx) |
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{ |
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size_t dst_len; |
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int ret; |
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dst_len = lzo_ctx->dst_len; |
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ret = lzo1x_decompress_safe(lzo_ctx->src, lzo_ctx->src_len, |
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lzo_ctx->dst, &dst_len); |
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if (ret != LZO_E_OK || dst_len != lzo_ctx->dst_len) |
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return -EINVAL; |
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return 0; |
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} |
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static int regcache_lzo_compress_cache_block(struct regmap *map, |
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struct regcache_lzo_ctx *lzo_ctx) |
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{ |
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int ret; |
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lzo_ctx->dst_len = lzo1x_worst_compress(PAGE_SIZE); |
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lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL); |
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if (!lzo_ctx->dst) { |
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lzo_ctx->dst_len = 0; |
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return -ENOMEM; |
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} |
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ret = regcache_lzo_compress(lzo_ctx); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static int regcache_lzo_decompress_cache_block(struct regmap *map, |
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struct regcache_lzo_ctx *lzo_ctx) |
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{ |
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int ret; |
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lzo_ctx->dst_len = lzo_ctx->decompressed_size; |
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lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL); |
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if (!lzo_ctx->dst) { |
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lzo_ctx->dst_len = 0; |
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return -ENOMEM; |
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} |
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ret = regcache_lzo_decompress(lzo_ctx); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static inline int regcache_lzo_get_blkindex(struct regmap *map, |
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unsigned int reg) |
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{ |
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return ((reg / map->reg_stride) * map->cache_word_size) / |
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DIV_ROUND_UP(map->cache_size_raw, |
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regcache_lzo_block_count(map)); |
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} |
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static inline int regcache_lzo_get_blkpos(struct regmap *map, |
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unsigned int reg) |
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{ |
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return (reg / map->reg_stride) % |
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(DIV_ROUND_UP(map->cache_size_raw, |
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regcache_lzo_block_count(map)) / |
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map->cache_word_size); |
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} |
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static inline int regcache_lzo_get_blksize(struct regmap *map) |
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{ |
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return DIV_ROUND_UP(map->cache_size_raw, |
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regcache_lzo_block_count(map)); |
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} |
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static int regcache_lzo_init(struct regmap *map) |
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{ |
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struct regcache_lzo_ctx **lzo_blocks; |
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size_t bmp_size; |
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int ret, i, blksize, blkcount; |
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const char *p, *end; |
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unsigned long *sync_bmp; |
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ret = 0; |
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blkcount = regcache_lzo_block_count(map); |
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map->cache = kcalloc(blkcount, sizeof(*lzo_blocks), |
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GFP_KERNEL); |
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if (!map->cache) |
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return -ENOMEM; |
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lzo_blocks = map->cache; |
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/* |
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* allocate a bitmap to be used when syncing the cache with |
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* the hardware. Each time a register is modified, the corresponding |
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* bit is set in the bitmap, so we know that we have to sync |
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* that register. |
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*/ |
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bmp_size = map->num_reg_defaults_raw; |
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sync_bmp = bitmap_zalloc(bmp_size, GFP_KERNEL); |
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if (!sync_bmp) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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/* allocate the lzo blocks and initialize them */ |
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for (i = 0; i < blkcount; i++) { |
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lzo_blocks[i] = kzalloc(sizeof **lzo_blocks, |
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GFP_KERNEL); |
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if (!lzo_blocks[i]) { |
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bitmap_free(sync_bmp); |
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ret = -ENOMEM; |
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goto err; |
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} |
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lzo_blocks[i]->sync_bmp = sync_bmp; |
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lzo_blocks[i]->sync_bmp_nbits = bmp_size; |
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/* alloc the working space for the compressed block */ |
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ret = regcache_lzo_prepare(lzo_blocks[i]); |
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if (ret < 0) |
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goto err; |
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} |
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blksize = regcache_lzo_get_blksize(map); |
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p = map->reg_defaults_raw; |
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end = map->reg_defaults_raw + map->cache_size_raw; |
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/* compress the register map and fill the lzo blocks */ |
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for (i = 0; i < blkcount; i++, p += blksize) { |
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lzo_blocks[i]->src = p; |
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if (p + blksize > end) |
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lzo_blocks[i]->src_len = end - p; |
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else |
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lzo_blocks[i]->src_len = blksize; |
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ret = regcache_lzo_compress_cache_block(map, |
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lzo_blocks[i]); |
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if (ret < 0) |
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goto err; |
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lzo_blocks[i]->decompressed_size = |
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lzo_blocks[i]->src_len; |
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} |
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return 0; |
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err: |
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regcache_lzo_exit(map); |
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return ret; |
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} |
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static int regcache_lzo_exit(struct regmap *map) |
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{ |
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struct regcache_lzo_ctx **lzo_blocks; |
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int i, blkcount; |
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lzo_blocks = map->cache; |
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if (!lzo_blocks) |
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return 0; |
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blkcount = regcache_lzo_block_count(map); |
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/* |
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* the pointer to the bitmap used for syncing the cache |
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* is shared amongst all lzo_blocks. Ensure it is freed |
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* only once. |
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*/ |
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if (lzo_blocks[0]) |
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bitmap_free(lzo_blocks[0]->sync_bmp); |
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for (i = 0; i < blkcount; i++) { |
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if (lzo_blocks[i]) { |
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kfree(lzo_blocks[i]->wmem); |
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kfree(lzo_blocks[i]->dst); |
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} |
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/* each lzo_block is a pointer returned by kmalloc or NULL */ |
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kfree(lzo_blocks[i]); |
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} |
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kfree(lzo_blocks); |
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map->cache = NULL; |
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return 0; |
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} |
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static int regcache_lzo_read(struct regmap *map, |
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unsigned int reg, unsigned int *value) |
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{ |
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struct regcache_lzo_ctx *lzo_block, **lzo_blocks; |
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int ret, blkindex, blkpos; |
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size_t tmp_dst_len; |
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void *tmp_dst; |
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/* index of the compressed lzo block */ |
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blkindex = regcache_lzo_get_blkindex(map, reg); |
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/* register index within the decompressed block */ |
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blkpos = regcache_lzo_get_blkpos(map, reg); |
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lzo_blocks = map->cache; |
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lzo_block = lzo_blocks[blkindex]; |
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/* save the pointer and length of the compressed block */ |
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tmp_dst = lzo_block->dst; |
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tmp_dst_len = lzo_block->dst_len; |
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/* prepare the source to be the compressed block */ |
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lzo_block->src = lzo_block->dst; |
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lzo_block->src_len = lzo_block->dst_len; |
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/* decompress the block */ |
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ret = regcache_lzo_decompress_cache_block(map, lzo_block); |
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if (ret >= 0) |
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/* fetch the value from the cache */ |
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*value = regcache_get_val(map, lzo_block->dst, blkpos); |
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kfree(lzo_block->dst); |
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/* restore the pointer and length of the compressed block */ |
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lzo_block->dst = tmp_dst; |
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lzo_block->dst_len = tmp_dst_len; |
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return ret; |
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} |
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static int regcache_lzo_write(struct regmap *map, |
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unsigned int reg, unsigned int value) |
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{ |
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struct regcache_lzo_ctx *lzo_block, **lzo_blocks; |
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int ret, blkindex, blkpos; |
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size_t tmp_dst_len; |
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void *tmp_dst; |
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/* index of the compressed lzo block */ |
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blkindex = regcache_lzo_get_blkindex(map, reg); |
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/* register index within the decompressed block */ |
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blkpos = regcache_lzo_get_blkpos(map, reg); |
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lzo_blocks = map->cache; |
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lzo_block = lzo_blocks[blkindex]; |
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/* save the pointer and length of the compressed block */ |
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tmp_dst = lzo_block->dst; |
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tmp_dst_len = lzo_block->dst_len; |
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/* prepare the source to be the compressed block */ |
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lzo_block->src = lzo_block->dst; |
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lzo_block->src_len = lzo_block->dst_len; |
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/* decompress the block */ |
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ret = regcache_lzo_decompress_cache_block(map, lzo_block); |
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if (ret < 0) { |
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kfree(lzo_block->dst); |
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goto out; |
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} |
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/* write the new value to the cache */ |
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if (regcache_set_val(map, lzo_block->dst, blkpos, value)) { |
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kfree(lzo_block->dst); |
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goto out; |
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} |
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/* prepare the source to be the decompressed block */ |
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lzo_block->src = lzo_block->dst; |
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lzo_block->src_len = lzo_block->dst_len; |
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/* compress the block */ |
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ret = regcache_lzo_compress_cache_block(map, lzo_block); |
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if (ret < 0) { |
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kfree(lzo_block->dst); |
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kfree(lzo_block->src); |
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goto out; |
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} |
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/* set the bit so we know we have to sync this register */ |
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set_bit(reg / map->reg_stride, lzo_block->sync_bmp); |
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kfree(tmp_dst); |
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kfree(lzo_block->src); |
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return 0; |
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out: |
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lzo_block->dst = tmp_dst; |
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lzo_block->dst_len = tmp_dst_len; |
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return ret; |
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} |
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static int regcache_lzo_sync(struct regmap *map, unsigned int min, |
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unsigned int max) |
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{ |
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struct regcache_lzo_ctx **lzo_blocks; |
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unsigned int val; |
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int i; |
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int ret; |
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lzo_blocks = map->cache; |
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i = min; |
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for_each_set_bit_from(i, lzo_blocks[0]->sync_bmp, |
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lzo_blocks[0]->sync_bmp_nbits) { |
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if (i > max) |
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continue; |
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ret = regcache_read(map, i, &val); |
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if (ret) |
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return ret; |
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/* Is this the hardware default? If so skip. */ |
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ret = regcache_lookup_reg(map, i); |
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if (ret > 0 && val == map->reg_defaults[ret].def) |
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continue; |
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map->cache_bypass = true; |
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ret = _regmap_write(map, i, val); |
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map->cache_bypass = false; |
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if (ret) |
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return ret; |
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dev_dbg(map->dev, "Synced register %#x, value %#x\n", |
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i, val); |
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} |
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return 0; |
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} |
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struct regcache_ops regcache_lzo_ops = { |
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.type = REGCACHE_COMPRESSED, |
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.name = "lzo", |
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.init = regcache_lzo_init, |
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.exit = regcache_lzo_exit, |
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.read = regcache_lzo_read, |
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.write = regcache_lzo_write, |
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.sync = regcache_lzo_sync |
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};
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