X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=direct%2Fbasic-test%2Fyaffs_m18_drv.c;fp=direct%2Fbasic-test%2Fyaffs_m18_drv.c;h=0000000000000000000000000000000000000000;hp=c35cb78138226775b17a2190dd26bce516445bcb;hb=c08faae4258b29a794ad55ca160c5a247145c838;hpb=87b33ecd1898c99b9aa2b0abcbb3e6002d6b3532 diff --git a/direct/basic-test/yaffs_m18_drv.c b/direct/basic-test/yaffs_m18_drv.c deleted file mode 100644 index c35cb78..0000000 --- a/direct/basic-test/yaffs_m18_drv.c +++ /dev/null @@ -1,365 +0,0 @@ -/* - * 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 - * - * 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_m18_drv.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 m18_drv_FlashInit() ynorsim_initialise() -#define m18_drv_FlashDeinit() ynorsim_shutdown() -#define m18_drv_FlashWrite32(addr,buf,nwords) ynorsim_wr32(addr,buf,nwords) -#define m18_drv_FlashRead32(addr,buf,nwords) ynorsim_rd32(addr,buf,nwords) -#define m18_drv_FlashEraseBlock(addr) ynorsim_erase(addr) -#define DEVICE_BASE ynorsim_get_base() -#else - -/* Compile this to hook up to read hardware */ -#include "../blob/yflashrw.h" -#define m18_drv_FlashInit() do{} while(0) -#define m18_drv_FlashDeinit() do {} while(0) -#define m18_drv_FlashWrite32(addr,buf,nwords) Y_FlashWrite(addr,buf,nwords) -#define m18_drv_FlashRead32(addr,buf,nwords) Y_FlashRead(addr,buf,nwords) -#define m18_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) -{ - 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 m18_drv_AndBytes(u8*target, const u8 *src, int nbytes) -{ - while(nbytes > 0){ - *target &= *src; - target++; - src++; - nbytes--; - } -} - -static int m18_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) != 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; - m18_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/4); - - /* Write the data */ - m18_drv_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; - m18_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/4); - - /* Write a post-marker */ - tmpSpare.page_status = YNOR_POSTMARKER; - m18_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(tmpSpare)/4); - - } else if(spare){ - /* This has to be a read-modify-write operation to handle NOR-ness */ - - m18_drv_FlashRead32(spareAddr,(u32 *)&tmpSpare,16/ 4); - - m18_drv_AndBytes((u8 *)&tmpSpare,(u8 *)spare,sizeof(struct yaffs_spare)); - - m18_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,16/ 4); - } - else { - BUG(); - } - - - return YAFFS_OK; - -} - -static int m18_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) - { - m18_drv_FlashRead32(dataAddr,(u32 *)data,dev->param.total_bytes_per_chunk / 4); - } - - if(oob) - { - m18_drv_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 m18_drv_FormatBlock(struct yaffs_dev *dev, int blockNumber) -{ - u32 *blockAddr = Block2Addr(dev,blockNumber); - u32 *formatAddr = Block2FormatAddr(dev,blockNumber); - u32 formatValue = FORMAT_VALUE; - - m18_drv_FlashEraseBlock(blockAddr); - m18_drv_FlashWrite32(formatAddr,&formatValue,1); - - return YAFFS_OK; -} - -static int m18_drv_UnformatBlock(struct yaffs_dev *dev, int blockNumber) -{ - u32 *formatAddr = Block2FormatAddr(dev,blockNumber); - u32 formatValue = 0; - - m18_drv_FlashWrite32(formatAddr,&formatValue,1); - - return YAFFS_OK; -} - -static int m18_drv_IsBlockFormatted(struct yaffs_dev *dev, int blockNumber) -{ - u32 *formatAddr = Block2FormatAddr(dev,blockNumber); - u32 formatValue; - - - m18_drv_FlashRead32(formatAddr,&formatValue,1); - - return (formatValue == FORMAT_VALUE); -} - -static int m18_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 - { - m18_drv_UnformatBlock(dev,blockNumber); - m18_drv_FormatBlock(dev,blockNumber); - return YAFFS_OK; - } - -} - -static int m18_drv_InitialiseNAND(struct yaffs_dev *dev) -{ - int i; - - m18_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(!m18_drv_IsBlockFormatted(dev,i)){ - m18_drv_FormatBlock(dev,i); - } - } - return YAFFS_OK; -} - -static int m18_drv_Deinitialise_flash_fn(struct yaffs_dev *dev) -{ - dev=dev; - m18_drv_FlashDeinit(); - - return YAFFS_OK; -} - - -struct yaffs_dev *yaffs_m18_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 = 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 = m18_drv_WriteChunkToNAND; - drv->drv_read_chunk_fn = m18_drv_ReadChunkFromNAND; - drv->drv_erase_fn = m18_drv_EraseBlockInNAND; - drv->drv_initialise_fn = m18_drv_InitialiseNAND; - drv->drv_deinitialise_fn = m18_drv_Deinitialise_flash_fn; - - param->n_caches = 10; - param->disable_soft_del = 1; - - dev->driver_context = (void *) 1; // Used to identify the device in fstat. - - yaffs_add_device(dev); -}