+/*
+ * 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.
+ */
+
+/*
+ * 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 1.1 2008-11-07 00:34:47 charles Exp $";
+
+#include "yaffs_norif1.h"
+
+#include "yportenv.h"
+
+#include "yaffs_flashif.h"
+#include "yaffs_guts.h"
+
+#include "devextras.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 (32*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_Write32(addr,buf,nwords)
+#define ynorif1_FlashRead32(addr,buf,nwords) ynorsim_Read32(addr,buf,nwords)
+#define ynorif1_FlashEraseBlock(addr) ynorsim_EraseBlock(addr)
+#define DEVICE_BASE ynorsim_GetBase()
+#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(yaffs_Device *dev, int blockNumber)
+{
+ __u32 addr;
+
+ addr = (__u32) DEVICE_BASE;
+ addr += blockNumber * BLOCK_SIZE_IN_BYTES;
+
+ return (__u32 *) addr;
+}
+
+__u32 *Block2FormatAddr(yaffs_Device *dev,int blockNumber)
+{
+ __u32 addr;
+
+ addr = (__u32) Block2Addr(dev,blockNumber);
+ addr += FORMAT_OFFSET;
+
+ return (__u32 *)addr;
+}
+__u32 *Chunk2DataAddr(yaffs_Device *dev,int chunkId)
+{
+ unsigned block;
+ unsigned chunkInBlock;
+ __u32 addr;
+
+ block = chunkId/dev->nChunksPerBlock;
+ chunkInBlock = chunkId % dev->nChunksPerBlock;
+
+ addr = (__u32) Block2Addr(dev,block);
+ addr += chunkInBlock * DATA_BYTES_PER_CHUNK;
+
+ return (__u32 *)addr;
+}
+
+__u32 *Chunk2SpareAddr(yaffs_Device *dev,int chunkId)
+{
+ unsigned block;
+ unsigned chunkInBlock;
+ __u32 addr;
+
+ block = chunkId/dev->nChunksPerBlock;
+ chunkInBlock = chunkId % dev->nChunksPerBlock;
+
+ 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(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
+{
+ __u32 *dataAddr = Chunk2DataAddr(dev,chunkInNAND);
+ __u32 *spareAddr = Chunk2SpareAddr(dev,chunkInNAND);
+
+ 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(yaffs_Spare) != 16)
+ YBUG();
+
+ if(data && spare)
+ {
+ if(spare->pageStatus != 0xff)
+ YBUG();
+ /* Write a pre-marker */
+ memset(&tmpSpare,0xff,sizeof(tmpSpare));
+ tmpSpare.pageStatus = YNOR_PREMARKER;
+ ynorif1_FlashWrite32(spareAddr,(__u32 *)&tmpSpare,sizeof(yaffs_Spare)/4);
+
+ /* Write the data */
+ ynorif1_FlashWrite32(dataAddr,(__u32 *)data,dev->totalBytesPerChunk / 4);
+
+
+ memcpy(&tmpSpare,spare,sizeof(yaffs_Spare));
+
+ /* Write the real tags, but override the premarker*/
+ tmpSpare.pageStatus = YNOR_PREMARKER;
+ ynorif1_FlashWrite32(spareAddr,(__u32 *)&tmpSpare,sizeof(yaffs_Spare)/4);
+
+ /* Write a post-marker */
+ tmpSpare.pageStatus = 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(yaffs_Spare));
+
+ ynorif1_FlashWrite32(spareAddr,(__u32 *)&tmpSpare,16/ 4);
+ }
+ else {
+ YBUG();
+ }
+
+
+ return YAFFS_OK;
+
+}
+
+int ynorif1_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
+{
+
+ __u32 *dataAddr = Chunk2DataAddr(dev,chunkInNAND);
+ __u32 *spareAddr = Chunk2SpareAddr(dev,chunkInNAND);
+
+ if(data)
+ {
+ ynorif1_FlashRead32(dataAddr,(__u32 *)data,dev->totalBytesPerChunk / 4);
+ }
+
+ if(spare)
+ {
+ ynorif1_FlashRead32(spareAddr,(__u32 *)spare,16/ 4);
+
+ /* If the page status is 0xF then it was written properly
+ * so change that to 0xFF so that the rest of yaffs is happy.
+ */
+ if(spare->pageStatus == YNOR_POSTMARKER)
+ spare->pageStatus = 0xFF;
+ }
+
+
+ return YAFFS_OK;
+
+}
+
+static int ynorif1_FormatBlock(yaffs_Device *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(yaffs_Device *dev, int blockNumber)
+{
+ __u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+ __u32 formatValue = 0;
+
+ ynorif1_FlashWrite32(formatAddr,&formatValue,1);
+
+ return YAFFS_OK;
+}
+
+static int ynorif1_IsBlockFormatted(yaffs_Device *dev, int blockNumber)
+{
+ __u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+ __u32 formatValue;
+
+
+ ynorif1_FlashRead32(formatAddr,&formatValue,1);
+
+ return (formatValue == FORMAT_VALUE);
+}
+
+int ynorif1_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+
+ if(blockNumber < 0 || blockNumber >= BLOCKS_IN_DEVICE)
+ {
+ T(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(yaffs_Device *dev)
+{
+ int i;
+
+ ynorif1_FlashInit();
+ /* Go through the blocks formatting them if they are not formatted */
+ for(i = dev->startBlock; i <= dev->endBlock; i++){
+ if(!ynorif1_IsBlockFormatted(dev,i)){
+ ynorif1_FormatBlock(dev,i);
+ }
+ }
+ return YAFFS_OK;
+}
+
+int ynorif1_DeinitialiseNAND(yaffs_Device *dev)
+{
+
+ ynorif1_FlashDeinit();
+
+ return YAFFS_OK;
+}
+
+
projects / yaffs2.git / commitdiff