+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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->use_nand_ecc enabled, then ECC overheads are not required.
- */
-
-#include "yportenv.h"
-#include "yaffs_trace.h"
-
-#include "yaffs_ramdisk.h"
-#include "yaffs_guts.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(struct yaffs_dev *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 = malloc(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] = malloc(sizeof(yramdisk_block))) == 0)
- {
- fail = 1;
- }
- else
- {
- yramdisk_erase(dev,i);
- nAllocated++;
- }
- }
-
- if(fail)
- {
- for(i = 0; i < nAllocated; i++)
- {
- kfree(ramdisk.block[i]);
- }
- kfree(ramdisk.block);
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Allocation failed, could only allocate %dMB of %dMB requested.\n",
- nAllocated/64,ramdisk.nBlocks * 528);
- return 0;
- }
-
-
- return 1;
-}
-
-int yramdisk_wr_chunk(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_ext_tags *tags)
-{
- int blk;
- int pg;
-
-
- CheckInit(dev);
-
- blk = nand_chunk/32;
- pg = nand_chunk%32;
-
-
- if(data)
- {
- memcpy(ramdisk.block[blk]->page[pg].data,data,512);
- }
-
-
- if(tags)
- {
- struct yaffs_packed_tags1 pt;
-
- yaffs_pack_tags1(&pt,tags);
- memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
- }
-
- return YAFFS_OK;
-
-}
-
-
-int yramdisk_rd_chunk(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_ext_tags *tags)
-{
- int blk;
- int pg;
-
-
- CheckInit(dev);
-
- blk = nand_chunk/32;
- pg = nand_chunk%32;
-
-
- if(data)
- {
- memcpy(data,ramdisk.block[blk]->page[pg].data,512);
- }
-
-
- if(tags)
- {
- struct yaffs_packed_tags1 pt;
-
- memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(pt));
- yaffs_unpack_tags1(tags,&pt);
-
- }
-
- return YAFFS_OK;
-}
-
-
-int yramdisk_check_chunk_erased(struct yaffs_dev *dev,int nand_chunk)
-{
- int blk;
- int pg;
- int i;
-
-
- CheckInit(dev);
-
- blk = nand_chunk/32;
- pg = nand_chunk%32;
-
-
- for(i = 0; i < 528; i++)
- {
- if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
- {
- return YAFFS_FAIL;
- }
- }
-
- return YAFFS_OK;
-
-}
-
-int yramdisk_erase(struct yaffs_dev *dev, int blockNumber)
-{
-
- CheckInit(dev);
-
- if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
- {
- yaffs_trace(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_initialise(struct yaffs_dev *dev)
-{
- //dev->use_nand_ecc = 1; // force on use_nand_ecc which gets faked.
- // This saves us doing ECC checks.
-
- return YAFFS_OK;
-}
-
projects / yaffs2.git / blobdiff