+++ /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.
- */
-
-/*
- * 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
- *
- */
-
-#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
-
-static 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;
-}
-
-static u32 *Block2FormatAddr(struct yaffs_dev *dev,int blockNumber)
-{
- u32 addr;
-
- addr = (u32) Block2Addr(dev,blockNumber);
- addr += FORMAT_OFFSET;
-
- return (u32 *)addr;
-}
-
-static 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;
-}
-
-static 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;
-}
-
-
-static void ynorif1_AndBytes(u8*target, const u8 *src, int nbytes)
-{
- while(nbytes > 0){
- *target &= *src;
- target++;
- src++;
- nbytes--;
- }
-}
-
-static int ynorif1_WriteChunkToNAND(struct yaffs_dev *dev,int nand_chunk,
- const u8 *data, int data_len,
- const u8 *oob, int oob_len)
-{
- u32 *dataAddr = Chunk2DataAddr(dev,nand_chunk);
- u32 *spareAddr = Chunk2SpareAddr(dev,nand_chunk);
-
- struct yaffs_spare *spare = (struct yaffs_spare *)oob;
- struct yaffs_spare tmpSpare;
-
- (void) oob_len;
-
- /* 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 && oob)
- {
- 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, data_len/ 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;
-
-}
-
-static int ynorif1_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk,
- u8 *data, int data_len,
- u8 *oob, int oob_len,
- enum yaffs_ecc_result *ecc_result)
-{
- struct yaffs_spare *spare = (struct yaffs_spare *)oob;
-
- 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(oob)
- {
- ynorif1_FlashRead32(spareAddr,(u32 *)spare, oob_len/ 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;
- }
-
- if(ecc_result)
- *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-
- 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);
-}
-
-static 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;
- }
-
-}
-
-static 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;
-}
-
-static int ynorif1_Deinitialise_flash_fn(struct yaffs_dev *dev)
-{
- dev=dev;
- ynorif1_FlashDeinit();
-
- return YAFFS_OK;
-}
-
-void ynorif1_install_drv(struct yaffs_dev *dev)
-{
- struct yaffs_param *param = &dev->param;
- struct yaffs_driver *drv = &dev->drv;
-
- param->total_bytes_per_chunk = 1024;
- param->chunks_per_block =248;
- param->n_reserved_blocks = 2;
- param->start_block = 0; // Can use block 0
- param->end_block = 31; // Last block
- param->use_nand_ecc = 0; // use YAFFS's ECC
- drv->drv_write_chunk_fn = ynorif1_WriteChunkToNAND;
- drv->drv_read_chunk_fn = ynorif1_ReadChunkFromNAND;
- drv->drv_erase_fn = ynorif1_EraseBlockInNAND;
- drv->drv_initialise_fn = ynorif1_InitialiseNAND;
- drv->drv_deinitialise_fn = ynorif1_Deinitialise_flash_fn;
-}
-
projects / yaffs2.git / blobdiff