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/*
* 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.
*/
/*
* This is an interface module for handling NOR in yaffs1 mode.
*/
/* First set up for M18 with 1k chunks and 16-byte spares.
*
* NB We're using the oddball M18 modes of operation here
* The chip is 64MB based at 0x0000, but YAFFS only going to use the top half
* ie. YAFFS will be from 32MB to 64MB.
*
* The M18 has two ways of writing data. Every Programming Region (1kbytes)
* can be programmed in two modes:
* * Object Mode 1024 bytes of write once data.
* * Control Mode: 512bytes of bit-writeable data.
* This is arranged as 32 * (16 bytes of bit-writable followed by 16 bytes of "dont touch")
*
* The block size is 256kB, making 128 blocks in the 32MB YAFFS area.
* Each block comprises:
* Offset 0k: 248 x 1k data pages
* Offset 248k: 248 x 32-byte spare areas implemented as 16 bytes of spare followed by 16 bytes untouched)
* Offset 248k + (248 * 32): Format marker
*
*/
const char *yaffs_norif1_c_version = "$Id: yaffs_norif1.c,v 1.6 2010-02-18 01:18:04 charles Exp $";
#include "yaffs_norif1.h"
#include "yportenv.h"
#include "yaffs_trace.h"
#include "yaffs_flashif.h"
#include "yaffs_guts.h"
#define SPARE_BYTES_PER_CHUNK 16
#define M18_SKIP 16
#define PROG_REGION_SIZE 1024
#define BLOCK_SIZE_IN_BYTES (256*1024)
#define CHUNKS_PER_BLOCK 248
#define SPARE_AREA_OFFSET (CHUNKS_PER_BLOCK * PROG_REGION_SIZE)
#define FORMAT_OFFSET (SPARE_AREA_OFFSET + CHUNKS_PER_BLOCK * (SPARE_BYTES_PER_CHUNK + M18_SKIP))
#define FORMAT_VALUE 0x1234
#define DATA_BYTES_PER_CHUNK 1024
#define BLOCKS_IN_DEVICE (8*1024/256)
#define YNOR_PREMARKER (0xF6)
#define YNOR_POSTMARKER (0xF0)
#if 1
/* Compile this for a simulation */
#include "ynorsim.h"
#define ynorif1_FlashInit() ynorsim_initialise()
#define ynorif1_FlashDeinit() ynorsim_shutdown()
#define ynorif1_FlashWrite32(addr,buf,nwords) ynorsim_wr32(addr,buf,nwords)
#define ynorif1_FlashRead32(addr,buf,nwords) ynorsim_rd32(addr,buf,nwords)
#define ynorif1_FlashEraseBlock(addr) ynorsim_erase(addr)
#define DEVICE_BASE ynorsim_get_base()
#else
/* Compile this for running on blob, hacked for yaffs access */
#include "../blob/yflashrw.h"
#define ynorif1_FlashInit() do{} while(0)
#define ynorif1_FlashDeinit() do {} while(0)
#define ynorif1_FlashWrite32(addr,buf,nwords) Y_FlashWrite(addr,buf,nwords)
#define ynorif1_FlashRead32(addr,buf,nwords) Y_FlashRead(addr,buf,nwords)
#define ynorif1_FlashEraseBlock(addr) Y_FlashErase(addr,BLOCK_SIZE_IN_BYTES)
#define DEVICE_BASE (32 * 1024 * 1024)
#endif
u32 *Block2Addr(struct yaffs_dev *dev, int blockNumber)
{
u32 addr;
dev=dev;
addr = (u32) DEVICE_BASE;
addr += blockNumber * BLOCK_SIZE_IN_BYTES;
return (u32 *) addr;
}
u32 *Block2FormatAddr(struct yaffs_dev *dev,int blockNumber)
{
u32 addr;
addr = (u32) Block2Addr(dev,blockNumber);
addr += FORMAT_OFFSET;
return (u32 *)addr;
}
u32 *Chunk2DataAddr(struct yaffs_dev *dev,int chunk_id)
{
unsigned block;
unsigned chunkInBlock;
u32 addr;
block = chunk_id/dev->param.chunks_per_block;
chunkInBlock = chunk_id % dev->param.chunks_per_block;
addr = (u32) Block2Addr(dev,block);
addr += chunkInBlock * DATA_BYTES_PER_CHUNK;
return (u32 *)addr;
}
u32 *Chunk2SpareAddr(struct yaffs_dev *dev,int chunk_id)
{
unsigned block;
unsigned chunkInBlock;
u32 addr;
block = chunk_id/dev->param.chunks_per_block;
chunkInBlock = chunk_id % dev->param.chunks_per_block;
addr = (u32) Block2Addr(dev,block);
addr += SPARE_AREA_OFFSET;
addr += chunkInBlock * (SPARE_BYTES_PER_CHUNK + M18_SKIP);
return (u32 *)addr;
}
void ynorif1_AndBytes(u8*target, const u8 *src, int nbytes)
{
while(nbytes > 0){
*target &= *src;
target++;
src++;
nbytes--;
}
}
int ynorif1_WriteChunkToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_spare *spare)
{
u32 *dataAddr = Chunk2DataAddr(dev,nand_chunk);
u32 *spareAddr = Chunk2SpareAddr(dev,nand_chunk);
struct yaffs_spare tmpSpare;
/* We should only be getting called for one of 3 reasons:
* Writing a chunk: data and spare will not be NULL
* Writing a deletion marker: data will be NULL, spare not NULL
* Writing a bad block marker: data will be NULL, spare not NULL
*/
if(sizeof(struct yaffs_spare) != 16)
BUG();
if(data && spare)
{
if(spare->page_status != 0xff)
BUG();
/* Write a pre-marker */
memset(&tmpSpare,0xff,sizeof(tmpSpare));
tmpSpare.page_status = YNOR_PREMARKER;
ynorif1_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/4);
/* Write the data */
ynorif1_FlashWrite32(dataAddr,(u32 *)data,dev->param.total_bytes_per_chunk / 4);
memcpy(&tmpSpare,spare,sizeof(struct yaffs_spare));
/* Write the real tags, but override the premarker*/
tmpSpare.page_status = YNOR_PREMARKER;
ynorif1_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/4);
/* Write a post-marker */
tmpSpare.page_status = YNOR_POSTMARKER;
ynorif1_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(tmpSpare)/4);
} else if(spare){
/* This has to be a read-modify-write operation to handle NOR-ness */
ynorif1_FlashRead32(spareAddr,(u32 *)&tmpSpare,16/ 4);
ynorif1_AndBytes((u8 *)&tmpSpare,(u8 *)spare,sizeof(struct yaffs_spare));
ynorif1_FlashWrite32(spareAddr,(u32 *)&tmpSpare,16/ 4);
}
else {
BUG();
}
return YAFFS_OK;
}
int ynorif1_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_spare *spare)
{
u32 *dataAddr = Chunk2DataAddr(dev,nand_chunk);
u32 *spareAddr = Chunk2SpareAddr(dev,nand_chunk);
if(data)
{
ynorif1_FlashRead32(dataAddr,(u32 *)data,dev->param.total_bytes_per_chunk / 4);
}
if(spare)
{
ynorif1_FlashRead32(spareAddr,(u32 *)spare,16/ 4);
/* If the page status is YNOR_POSTMARKER then it was written properly
* so change that to 0xFF so that the rest of yaffs is happy.
*/
if(spare->page_status == YNOR_POSTMARKER)
spare->page_status = 0xFF;
else if(spare->page_status != 0xff &&
(spare->page_status | YNOR_PREMARKER) != 0xff)
spare->page_status = YNOR_PREMARKER;
}
return YAFFS_OK;
}
static int ynorif1_FormatBlock(struct yaffs_dev *dev, int blockNumber)
{
u32 *blockAddr = Block2Addr(dev,blockNumber);
u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
u32 formatValue = FORMAT_VALUE;
ynorif1_FlashEraseBlock(blockAddr);
ynorif1_FlashWrite32(formatAddr,&formatValue,1);
return YAFFS_OK;
}
static int ynorif1_UnformatBlock(struct yaffs_dev *dev, int blockNumber)
{
u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
u32 formatValue = 0;
ynorif1_FlashWrite32(formatAddr,&formatValue,1);
return YAFFS_OK;
}
static int ynorif1_IsBlockFormatted(struct yaffs_dev *dev, int blockNumber)
{
u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
u32 formatValue;
ynorif1_FlashRead32(formatAddr,&formatValue,1);
return (formatValue == FORMAT_VALUE);
}
int ynorif1_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
{
if(blockNumber < 0 || blockNumber >= BLOCKS_IN_DEVICE)
{
yaffs_trace(YAFFS_TRACE_ALWAYS,
"Attempt to erase non-existant block %d\n",
blockNumber);
return YAFFS_FAIL;
}
else
{
ynorif1_UnformatBlock(dev,blockNumber);
ynorif1_FormatBlock(dev,blockNumber);
return YAFFS_OK;
}
}
int ynorif1_InitialiseNAND(struct yaffs_dev *dev)
{
int i;
ynorif1_FlashInit();
/* Go through the blocks formatting them if they are not formatted */
for(i = dev->param.start_block; i <= dev->param.end_block; i++){
if(!ynorif1_IsBlockFormatted(dev,i)){
ynorif1_FormatBlock(dev,i);
}
}
return YAFFS_OK;
}
int ynorif1_Deinitialise_flash_fn(struct yaffs_dev *dev)
{
dev=dev;
ynorif1_FlashDeinit();
return YAFFS_OK;
}
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