--- /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.
+ */
+
+/* This code is intended to be used with "regular" NOR that is bit-modifyable.
+ *
+ * Each "chunk" is a contguous area of 512 + 16 bytes.
+ * This makes 248 such chunks with some space left over where a format markerr
+ * is stored.
+ */
+
+#include "yaffs_nor_drv.h"
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_flashif.h"
+#include "yaffs_guts.h"
+
+/* Tunable data */
+#define DATA_BYTES_PER_CHUNK 512
+#define SPARE_BYTES_PER_CHUNK 16
+#define BLOCK_SIZE_IN_BYTES (128*1024)
+#define BYTES_IN_DEVICE (4*1024*1024)
+
+#define BYTES_PER_CHUNK (DATA_BYTES_PER_CHUNK + SPARE_BYTES_PER_CHUNK)
+#define SPARE_AREA_OFFSET DATA_BYTES_PER_CHUNK
+#define CHUNKS_PER_BLOCK (BLOCK_SIZE_IN_BYTES/BYTES_PER_CHUNK)
+
+#define BLOCKS_IN_DEVICE (BYTES_IN_DEVICE/BLOCK_SIZE_IN_BYTES)
+
+#define YNOR_PREMARKER (0xF6)
+#define YNOR_POSTMARKER (0xF0)
+
+#define FORMAT_OFFSET (CHUNKS_PER_BLOCK * BYTES_PER_CHUNK)
+#define FORMAT_VALUE 0x1234
+
+#if 1
+
+/* Compile this for a simulation */
+#include "ynorsim.h"
+
+static struct nor_sim *nor_sim;
+
+#define nor_drv_FlashInit() do {nor_sim = ynorsim_initialise("emfile-nor", BLOCKS_IN_DEVICE, BLOCK_SIZE_IN_BYTES); } while(0)
+#define nor_drv_FlashDeinit() ynorsim_shutdown(nor_sim)
+#define nor_drv_FlashWrite32(addr,buf,nwords) ynorsim_wr32(nor_sim,addr,buf,nwords)
+#define nor_drv_FlashRead32(addr,buf,nwords) ynorsim_rd32(nor_sim,addr,buf,nwords)
+#define nor_drv_FlashEraseBlock(addr) ynorsim_erase(nor_sim,addr)
+#define DEVICE_BASE ynorsim_get_base(nor_sim)
+
+#else
+
+/* Compile this to hook up to read hardware */
+#include "../blob/yflashrw.h"
+#define nor_drv_FlashInit() do{} while(0)
+#define nor_drv_FlashDeinit() do {} while(0)
+#define nor_drv_FlashWrite32(addr,buf,nwords) Y_FlashWrite(addr,buf,nwords)
+#define nor_drv_FlashRead32(addr,buf,nwords) Y_FlashRead(addr,buf,nwords)
+#define nor_drv_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)
+{
+ u8 *addr;
+
+ dev=dev;
+
+ addr = (u8*)DEVICE_BASE;
+ addr += blockNumber * BLOCK_SIZE_IN_BYTES;
+
+ return (u32 *) addr;
+}
+
+static u32 *Block2FormatAddr(struct yaffs_dev *dev, int blockNumber)
+{
+ u8 *addr;
+
+ addr = (u8*) Block2Addr(dev,blockNumber);
+ addr += FORMAT_OFFSET;
+
+ return (u32 *)addr;
+}
+
+static u32 *Chunk2DataAddr(struct yaffs_dev *dev, int chunk_id)
+{
+ unsigned block;
+ unsigned chunkInBlock;
+ u8 *addr;
+
+ block = chunk_id/dev->param.chunks_per_block;
+ chunkInBlock = chunk_id % dev->param.chunks_per_block;
+
+ addr = (u8*) Block2Addr(dev,block);
+ addr += chunkInBlock * BYTES_PER_CHUNK;
+
+ return (u32 *)addr;
+}
+
+static u32 *Chunk2SpareAddr(struct yaffs_dev *dev, int chunk_id)
+{
+ u8 *addr;
+
+ addr = (u8*) Chunk2DataAddr(dev, chunk_id);
+ addr += SPARE_AREA_OFFSET;
+ return (u32 *)addr;
+}
+
+
+static void nor_drv_AndBytes(u8*target, const u8 *src, int nbytes)
+{
+ while(nbytes > 0){
+ *target &= *src;
+ target++;
+ src++;
+ nbytes--;
+ }
+}
+
+static int nor_drv_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) != SPARE_BYTES_PER_CHUNK)
+ BUG();
+
+ if(data && oob) {
+ if(spare->page_status != 0xff)
+ BUG();
+ /* Write a pre-marker */
+ memset(&tmpSpare,0xff,sizeof(tmpSpare));
+ tmpSpare.page_status = YNOR_PREMARKER;
+ nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+
+ /* Write the data */
+ nor_drv_FlashWrite32(dataAddr,(u32 *)data, data_len/ sizeof(u32));
+
+ memcpy(&tmpSpare,spare,sizeof(struct yaffs_spare));
+
+ /* Write the real tags, but override the premarker*/
+ tmpSpare.page_status = YNOR_PREMARKER;
+ nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+
+ /* Write a post-marker */
+ tmpSpare.page_status = YNOR_POSTMARKER;
+ nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(tmpSpare)/sizeof(u32));
+
+ } else if(spare){
+ /* This has to be a read-modify-write operation to handle NOR-ness */
+
+ nor_drv_FlashRead32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+
+ nor_drv_AndBytes((u8 *)&tmpSpare,(u8 *)spare,sizeof(struct yaffs_spare));
+
+ nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+ } else {
+ BUG();
+ }
+
+ return YAFFS_OK;
+}
+
+static int nor_drv_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) {
+ nor_drv_FlashRead32(dataAddr,(u32 *)data,dev->param.total_bytes_per_chunk / sizeof(u32));
+ }
+
+ if (oob) {
+ nor_drv_FlashRead32(spareAddr,(u32 *)spare, oob_len/ sizeof(u32));
+
+ /* 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 nor_drv_FormatBlock(struct yaffs_dev *dev, int blockNumber)
+{
+ u32 *blockAddr = Block2Addr(dev,blockNumber);
+ u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+ u32 formatValue = FORMAT_VALUE;
+
+ nor_drv_FlashEraseBlock(blockAddr);
+ nor_drv_FlashWrite32(formatAddr,&formatValue,1);
+
+ return YAFFS_OK;
+}
+
+static int nor_drv_UnformatBlock(struct yaffs_dev *dev, int blockNumber)
+{
+ u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+ u32 formatValue = 0;
+
+ nor_drv_FlashWrite32(formatAddr,&formatValue,1);
+
+ return YAFFS_OK;
+}
+
+static int nor_drv_IsBlockFormatted(struct yaffs_dev *dev, int blockNumber)
+{
+ u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+ u32 formatValue;
+
+
+ nor_drv_FlashRead32(formatAddr,&formatValue,1);
+
+ return (formatValue == FORMAT_VALUE);
+}
+
+static int nor_drv_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
+ {
+ nor_drv_UnformatBlock(dev,blockNumber);
+ nor_drv_FormatBlock(dev,blockNumber);
+ return YAFFS_OK;
+ }
+
+}
+
+static int nor_drv_InitialiseNAND(struct yaffs_dev *dev)
+{
+ int i;
+
+ nor_drv_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(!nor_drv_IsBlockFormatted(dev,i)){
+ nor_drv_FormatBlock(dev,i);
+ }
+ }
+ return YAFFS_OK;
+}
+
+static int nor_drv_Deinitialise_flash_fn(struct yaffs_dev *dev)
+{
+ dev=dev;
+
+ nor_drv_FlashDeinit();
+
+ return YAFFS_OK;
+}
+
+
+struct yaffs_dev *yaffs_nor_install_drv(const char *name)
+{
+
+ struct yaffs_dev *dev = malloc(sizeof(struct yaffs_dev));
+ char *name_copy = strdup(name);
+ struct yaffs_param *param;
+ struct yaffs_driver *drv;
+
+
+ if(!dev || !name_copy) {
+ free(name_copy);
+ free(dev);
+ return NULL;
+ }
+
+ param = &dev->param;
+ drv = &dev->drv;
+
+ memset(dev, 0, sizeof(*dev));
+
+ param->name = name_copy;
+
+ param->total_bytes_per_chunk = DATA_BYTES_PER_CHUNK;
+ param->chunks_per_block = CHUNKS_PER_BLOCK;
+ param->n_reserved_blocks = 2;
+ param->start_block = 0; // Can use block 0
+ param->end_block = BLOCKS_IN_DEVICE - 1; // Last block
+ param->use_nand_ecc = 0; // use YAFFS's ECC
+
+ drv->drv_write_chunk_fn = nor_drv_WriteChunkToNAND;
+ drv->drv_read_chunk_fn = nor_drv_ReadChunkFromNAND;
+ drv->drv_erase_fn = nor_drv_EraseBlockInNAND;
+ drv->drv_initialise_fn = nor_drv_InitialiseNAND;
+ drv->drv_deinitialise_fn = nor_drv_Deinitialise_flash_fn;
+
+ param->n_caches = 10;
+ param->disable_soft_del = 1;
+
+ dev->driver_context = (void *) nor_sim;
+
+ yaffs_add_device(dev);
+
+ return NULL;
+}
projects / yaffs2.git / blobdiff