yaffs_mtdif.c
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/*
* 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.
*/
/* XXX U-BOOT XXX */
#include <common.h>
#include "yportenv.h"
#include "yaffs_mtdif.h"
#include <linux/mtd/mtd.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/mtd/rawnand.h>
static inline void translate_spare2oob(const struct yaffs_spare *spare, u8 *oob)
{
oob[0] = spare->tb0;
oob[1] = spare->tb1;
oob[2] = spare->tb2;
oob[3] = spare->tb3;
oob[4] = spare->tb4;
oob[5] = spare->tb5 & 0x3f;
oob[5] |= spare->block_status == 'Y' ? 0 : 0x80;
oob[5] |= spare->page_status == 0 ? 0 : 0x40;
oob[6] = spare->tb6;
oob[7] = spare->tb7;
}
static inline void translate_oob2spare(struct yaffs_spare *spare, u8 *oob)
{
struct yaffs_nand_spare *nspare = (struct yaffs_nand_spare *)spare;
spare->tb0 = oob[0];
spare->tb1 = oob[1];
spare->tb2 = oob[2];
spare->tb3 = oob[3];
spare->tb4 = oob[4];
spare->tb5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
spare->block_status = oob[5] & 0x80 ? 0xff : 'Y';
spare->page_status = oob[5] & 0x40 ? 0xff : 0;
spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
spare->tb6 = oob[6];
spare->tb7 = oob[7];
spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
}
int nandmtd_WriteChunkToNAND(struct yaffs_dev *dev, int chunkInNAND,
const u8 *data, const struct yaffs_spare *spare)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
struct mtd_oob_ops ops;
size_t dummy;
int retval = 0;
loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
u8 spareAsBytes[8]; /* OOB */
if (data && !spare)
retval = mtd_write(mtd, addr, dev->data_bytes_per_chunk,
&dummy, data);
else if (spare) {
if (dev->param.use_nand_ecc) {
translate_spare2oob(spare, spareAsBytes);
ops.mode = MTD_OPS_AUTO_OOB;
ops.ooblen = 8; /* temp hack */
} else {
ops.mode = MTD_OPS_RAW;
ops.ooblen = YAFFS_BYTES_PER_SPARE;
}
ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
ops.datbuf = (u8 *)data;
ops.ooboffs = 0;
ops.oobbuf = spareAsBytes;
retval = mtd_write_oob(mtd, addr, &ops);
}
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd_ReadChunkFromNAND(struct yaffs_dev *dev, int chunkInNAND, u8 *data,
struct yaffs_spare *spare)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
struct mtd_oob_ops ops;
size_t dummy;
int retval = 0;
loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
u8 spareAsBytes[8]; /* OOB */
if (data && !spare)
retval = mtd_read(mtd, addr, dev->data_bytes_per_chunk,
&dummy, data);
else if (spare) {
if (dev->param.use_nand_ecc) {
ops.mode = MTD_OPS_AUTO_OOB;
ops.ooblen = 8; /* temp hack */
} else {
ops.mode = MTD_OPS_RAW;
ops.ooblen = YAFFS_BYTES_PER_SPARE;
}
ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
ops.datbuf = data;
ops.ooboffs = 0;
ops.oobbuf = spareAsBytes;
retval = mtd_read_oob(mtd, addr, &ops);
if (dev->param.use_nand_ecc)
translate_oob2spare(spare, spareAsBytes);
}
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
__u32 addr =
((loff_t) blockNumber) * dev->data_bytes_per_chunk
* dev->param.chunks_per_block;
struct erase_info ei;
int retval = 0;
ei.mtd = mtd;
ei.addr = addr;
ei.len = dev->data_bytes_per_chunk * dev->param.chunks_per_block;
ei.time = 1000;
ei.retries = 2;
ei.callback = NULL;
ei.priv = (u_long) dev;
/* Todo finish off the ei if required */
retval = mtd_erase(mtd, &ei);
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd_InitialiseNAND(struct yaffs_dev *dev)
{
return YAFFS_OK;
}