diff options
Diffstat (limited to 'fs/yaffs2/direct/yaffs_ramdisk.c')
| -rw-r--r-- | fs/yaffs2/direct/yaffs_ramdisk.c | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/fs/yaffs2/direct/yaffs_ramdisk.c b/fs/yaffs2/direct/yaffs_ramdisk.c deleted file mode 100644 index 57f27ce..0000000 --- a/fs/yaffs2/direct/yaffs_ramdisk.c +++ /dev/null @@ -1,235 +0,0 @@ -/* - * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. - * - * Copyright (C) 2002-2007 Aleph One Ltd. - * for Toby Churchill Ltd and Brightstar Engineering - * - * Created by Charles Manning <charles@aleph1.co.uk> - * - * 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. - */ - -/* - * yaffs_ramdisk.c: yaffs ram disk component - * This provides a ram disk under yaffs. - * NB this is not intended for NAND emulation. - * Use this with dev->useNANDECC enabled, then ECC overheads are not required. - */ - -/* XXX U-BOOT XXX */ -#include <common.h> - -const char *yaffs_ramdisk_c_version = "$Id: yaffs_ramdisk.c,v 1.4 2007/02/14 01:09:06 wookey Exp $"; - - -#include "yportenv.h" - -#include "yaffs_ramdisk.h" -#include "yaffs_guts.h" -#include "devextras.h" -#include "yaffs_packedtags1.h" - - - -#define SIZE_IN_MB 2 - -#define BLOCK_SIZE (32 * 528) -#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512)) - - - - - -typedef struct -{ - __u8 data[528]; // Data + spare -} yramdisk_Page; - -typedef struct -{ - yramdisk_Page page[32]; // The pages in the block - -} yramdisk_Block; - - - -typedef struct -{ - yramdisk_Block **block; - int nBlocks; -} yramdisk_Device; - -static yramdisk_Device ramdisk; - -static int CheckInit(yaffs_Device *dev) -{ - static int initialised = 0; - - int i; - int fail = 0; - //int nBlocks; - int nAllocated = 0; - - if(initialised) - { - return YAFFS_OK; - } - - initialised = 1; - - - ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024); - - ramdisk.block = YMALLOC(sizeof(yramdisk_Block *) * ramdisk.nBlocks); - - if(!ramdisk.block) return 0; - - for(i=0; i <ramdisk.nBlocks; i++) - { - ramdisk.block[i] = NULL; - } - - for(i=0; i <ramdisk.nBlocks && !fail; i++) - { - if((ramdisk.block[i] = YMALLOC(sizeof(yramdisk_Block))) == 0) - { - fail = 1; - } - else - { - yramdisk_EraseBlockInNAND(dev,i); - nAllocated++; - } - } - - if(fail) - { - for(i = 0; i < nAllocated; i++) - { - YFREE(ramdisk.block[i]); - } - YFREE(ramdisk.block); - - T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n", - nAllocated/64,ramdisk.nBlocks * 528)); - return 0; - } - - - return 1; -} - -int yramdisk_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags) -{ - int blk; - int pg; - - - CheckInit(dev); - - blk = chunkInNAND/32; - pg = chunkInNAND%32; - - - if(data) - { - memcpy(ramdisk.block[blk]->page[pg].data,data,512); - } - - - if(tags) - { - yaffs_PackedTags1 pt; - - yaffs_PackTags1(&pt,tags); - memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt)); - } - - return YAFFS_OK; - -} - - -int yramdisk_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags) -{ - int blk; - int pg; - - - CheckInit(dev); - - blk = chunkInNAND/32; - pg = chunkInNAND%32; - - - if(data) - { - memcpy(data,ramdisk.block[blk]->page[pg].data,512); - } - - - if(tags) - { - yaffs_PackedTags1 pt; - - memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(pt)); - yaffs_UnpackTags1(tags,&pt); - - } - - return YAFFS_OK; -} - - -int yramdisk_CheckChunkErased(yaffs_Device *dev,int chunkInNAND) -{ - int blk; - int pg; - int i; - - - CheckInit(dev); - - blk = chunkInNAND/32; - pg = chunkInNAND%32; - - - for(i = 0; i < 528; i++) - { - if(ramdisk.block[blk]->page[pg].data[i] != 0xFF) - { - return YAFFS_FAIL; - } - } - - return YAFFS_OK; - -} - -int yramdisk_EraseBlockInNAND(yaffs_Device *dev, int blockNumber) -{ - - CheckInit(dev); - - if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks) - { - T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber)); - return YAFFS_FAIL; - } - else - { - memset(ramdisk.block[blockNumber],0xFF,sizeof(yramdisk_Block)); - return YAFFS_OK; - } - -} - -int yramdisk_InitialiseNAND(yaffs_Device *dev) -{ - //dev->useNANDECC = 1; // force on useNANDECC which gets faked. - // This saves us doing ECC checks. - - return YAFFS_OK; -} |