+++ /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.
- */
-
-
-const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.3 2007-02-14 01:09:06 wookey Exp $";
-
-
-#include "yportenv.h"
-
-#include "yaffs_flashif.h"
-#include "yaffs_guts.h"
-
-
-#define SIZE_IN_MB 16
-
-#define BLOCK_SIZE (32 * 528)
-#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
-
-
-
-typedef struct
-{
- u8 data[528]; // Data + spare
-} yflash_Page;
-
-typedef struct
-{
- yflash_Page page[32]; // The pages in the block
-
-} yflash_Block;
-
-
-
-typedef struct
-{
- yflash_Block **block;
- int nBlocks;
-} yflash_Device;
-
-static yflash_Device ramdisk;
-
-static int CheckInit(struct yaffs_dev *dev)
-{
- static int initialised = 0;
-
- int i;
- int fail = 0;
- int nAllocated = 0;
-
- if(initialised)
- {
- return YAFFS_OK;
- }
-
- initialised = 1;
-
-
- ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
-
- ramdisk.block = kmalloc(sizeof(yflash_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] = kmalloc(sizeof(yflash_Block))) == 0)
- {
- fail = 1;
- }
- else
- {
- yflash_EraseBlockInNAND(dev,i);
- nAllocated++;
- }
- }
-
- if(fail)
- {
- for(i = 0; i < nAllocated; i++)
- {
- kfree(ramdisk.block[i]);
- }
- kfree(ramdisk.block);
-
- T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
- nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
- return 0;
- }
-
-
-
- return 1;
-}
-
-int yflash_WriteChunkWithTagsToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, 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)
- {
- yaffs_PackedTags pt;
- yaffs_PackTags(&pt,tags);
- memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
- }
-
- return YAFFS_OK;
-
-}
-
-
-int yflash_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_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)
- {
- yaffs_PackedTags pt;
- memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
- yaffs_unpack_tags(tags,&pt);
- }
-
- return YAFFS_OK;
-}
-
-
-int yflash_CheckChunkErased(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 yflash_EraseBlockInNAND(struct yaffs_dev *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(yflash_Block));
- return YAFFS_OK;
- }
-
-}
-
-int yflash_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no)
-{
- return YAFFS_OK;
-
-}
-int yflash_QueryNANDBlock(struct yaffs_dev *dev, int block_no, enum yaffs_block_state *state, int *seq_number)
-{
- *state = YAFFS_BLOCK_STATE_EMPTY;
- *seq_number = 0;
-}
-
-
-int yflash_InitialiseNAND(struct yaffs_dev *dev)
-{
- return YAFFS_OK;
-}
-
projects / yaffs2.git / blobdiff