mirror of
https://bitbucket.org/librepilot/librepilot.git
synced 2024-12-01 09:24:10 +01:00
348 lines
8.8 KiB
C
348 lines
8.8 KiB
C
/*
|
|
* 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
|
|
param->disable_soft_del = 1;
|
|
|
|
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;
|
|
}
|