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/*
* 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.
*/
#include "yportenv.h"
#include "yaffs_mtdif.h"
#include "linux/mtd/mtd.h"
#include "linux/types.h"
#include "linux/time.h"
#include "linux/mtd/nand.h"
#include "linux/kernel.h"
#include "linux/version.h"
#include "linux/types.h"
#include "yaffs_trace.h"
#include "yaffs_guts.h"
#include "yaffs_linux.h"
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
#define mtd_erase(m, ei) (m)->erase(m, ei)
#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops)
#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops)
#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs)
#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs)
#endif
int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
u32 addr =
((loff_t) block_no) * dev->param.total_bytes_per_chunk *
dev->param.chunks_per_block;
struct erase_info ei;
int retval = 0;
ei.mtd = mtd;
ei.addr = addr;
ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
ei.time = 1000;
ei.retries = 2;
ei.callback = NULL;
ei.priv = (u_long) dev;
retval = mtd_erase(mtd, &ei);
if (retval == 0)
return YAFFS_OK;
return YAFFS_FAIL;
}
static int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
const u8 *data, int data_len,
const u8 *oob, int oob_len)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
loff_t addr;
struct mtd_oob_ops ops;
int retval;
yaffs_trace(YAFFS_TRACE_MTD,
"yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n",
dev, nand_chunk, data, data_len, oob, oob_len);
if (!data || !data_len) {
data = NULL;
data_len = 0;
}
if (!oob || !oob_len) {
oob = NULL;
oob_len = 0;
}
addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
memset(&ops, 0, sizeof(ops));
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = (data) ? data_len : 0;
ops.ooblen = oob_len;
ops.datbuf = (u8 *)data;
ops.oobbuf = (u8 *)oob;
retval = mtd_write_oob(mtd, addr, &ops);
if (retval) {
yaffs_trace(YAFFS_TRACE_MTD,
"write_oob failed, chunk %d, mtd error %d",
nand_chunk, retval);
}
return retval ? YAFFS_FAIL : YAFFS_OK;
}
static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
u8 *data, int data_len,
u8 *oob, int oob_len,
enum yaffs_ecc_result *ecc_result)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
loff_t addr;
struct mtd_oob_ops ops;
int retval;
addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
memset(&ops, 0, sizeof(ops));
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = (data) ? data_len : 0;
ops.ooblen = oob_len;
ops.datbuf = data;
ops.oobbuf = oob;
#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 20))
/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
* help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
*/
ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
#endif
/* Read page and oob using MTD.
* Check status and determine ECC result.
*/
retval = mtd_read_oob(mtd, addr, &ops);
if (retval)
yaffs_trace(YAFFS_TRACE_MTD,
"read_oob failed, chunk %d, mtd error %d",
nand_chunk, retval);
switch (retval) {
case 0:
/* no error */
if(ecc_result)
*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
break;
case -EUCLEAN:
/* MTD's ECC fixed the data */
if(ecc_result)
*ecc_result = YAFFS_ECC_RESULT_FIXED;
dev->n_ecc_fixed++;
break;
case -EBADMSG:
default:
/* MTD's ECC could not fix the data */
dev->n_ecc_unfixed++;
if(ecc_result)
*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
return YAFFS_FAIL;
}
return YAFFS_OK;
}
static int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
loff_t addr;
struct erase_info ei;
int retval = 0;
u32 block_size;
block_size = dev->param.total_bytes_per_chunk *
dev->param.chunks_per_block;
addr = ((loff_t) block_no) * block_size;
ei.mtd = mtd;
ei.addr = addr;
ei.len = block_size;
ei.time = 1000;
ei.retries = 2;
ei.callback = NULL;
ei.priv = (u_long) dev;
retval = mtd_erase(mtd, &ei);
if (retval == 0)
return YAFFS_OK;
return YAFFS_FAIL;
}
static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
int retval;
yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no);
return (retval) ? YAFFS_FAIL : YAFFS_OK;
}
static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
int retval;
yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no);
retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no);
return (retval) ? YAFFS_FAIL : YAFFS_OK;
}
static int yaffs_mtd_initialise(struct yaffs_dev *dev)
{
return YAFFS_OK;
}
static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
{
return YAFFS_OK;
}
void yaffs_mtd_drv_install(struct yaffs_dev *dev)
{
struct yaffs_driver *drv = &dev->drv;
drv->drv_write_chunk_fn = yaffs_mtd_write;
drv->drv_read_chunk_fn = yaffs_mtd_read;
drv->drv_erase_fn = yaffs_mtd_erase;
drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
drv->drv_check_bad_fn = yaffs_mtd_check_bad;
drv->drv_initialise_fn = yaffs_mtd_initialise;
drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;
}
struct mtd_info * yaffs_get_mtd_device(dev_t sdev)
{
struct mtd_info *mtd;
mtd = yaffs_get_mtd_device(sdev);
/* Check it's an mtd device..... */
if (MAJOR(sdev) != MTD_BLOCK_MAJOR)
return NULL; /* This isn't an mtd device */
/* Check it's NAND */
if (mtd->type != MTD_NANDFLASH) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"yaffs: MTD device is not NAND it's type %d",
mtd->type);
return NULL;
}
yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
#else
yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
#endif
return mtd;
}
int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
{
if (yaffs_version == 2) {
if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
!inband_tags) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device does not have the right page sizes"
);
return -1;
}
} else {
if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device does not support have the right page sizes"
);
return -1;
}
}
return 0;
}
void yaffs_put_mtd_device(struct mtd_info *mtd)
{
if(mtd)
put_mtd_device(mtd);
}
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