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mtd: Add new SmartMedia/xD FTL

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This implements new readwrite SmartMedia/xd FTL.

mtd driver must have support proper ECC and badblock verification
based on oob parts for 512 bytes nand.

Also mtd driver must define read_oob and write_oob, which are used
to read and write both data and oob together.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Maxim Levitsky 2010-02-22 20:39:41 +02:00 committed by David Woodhouse
parent a7790532f5
commit 7d17c02a01
4 changed files with 1400 additions and 0 deletions
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21
drivers/mtd/Kconfig
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@ -304,6 +304,27 @@ config SSFDC
This enables read only access to SmartMedia formatted NAND
flash. You can mount it with FAT file system.
config SM_FTL
tristate "SmartMedia/xD new translation layer"
depends on EXPERIMENTAL && BLOCK
select MTD_BLKDEVS
help
This enables new and very EXPERMENTAL support for SmartMedia/xD
FTL (Flash tanslation layer)
Write support isn't yet well tested, therefore this code IS likely to
eat your card, so please don't use it together with valuable data.
Use readonly driver (CONFIG_SSFDC) instead.
config SM_FTL_MUSEUM
boolean "Additional Support for 1MiB and 2MiB SmartMedia cards"
depends on SM_FTL && MTD_NAND
select MTD_NAND_ECC_SMC
help
Very old SmartMedia cards need ECC to be calculated in the FTL
Such cards are very rare, thus enabling this option is mostly useless
Also this support is completely UNTESTED.
config MTD_OOPS
tristate "Log panic/oops to an MTD buffer"
depends on MTD

1
drivers/mtd/Makefile
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@ -24,6 +24,7 @@ obj-$(CONFIG_NFTL) += nftl.o
obj-$(CONFIG_INFTL) += inftl.o
obj-$(CONFIG_RFD_FTL) += rfd_ftl.o
obj-$(CONFIG_SSFDC) += ssfdc.o
obj-$(CONFIG_SM_FTL) += sm_ftl.o
obj-$(CONFIG_MTD_OOPS) += mtdoops.o
nftl-objs := nftlcore.o nftlmount.o

1284
drivers/mtd/sm_ftl.c Normal file
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File diff suppressed because it is too large Load diff

94
drivers/mtd/sm_ftl.h Normal file
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@ -0,0 +1,94 @@
/*
* Copyright © 2009 - Maxim Levitsky
* SmartMedia/xD translation layer
*
* Based loosly on ssfdc.c which is
* © 2005 Eptar srl
* Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
*
* 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 <linux/mtd/blktrans.h>
#include <linux/kfifo.h>
#include <linux/sched.h>
#include <linux/completion.h>
#include <linux/mtd/mtd.h>
struct ftl_zone {
int initialized;
int16_t *lba_to_phys_table; /* LBA to physical table */
struct kfifo free_sectors; /* queue of free sectors */
};
struct sm_ftl {
struct mtd_blktrans_dev *trans;
struct mutex mutex; /* protects the structure */
struct ftl_zone *zones; /* FTL tables for each zone */
/* Media information */
int block_size; /* block size in bytes */
int zone_size; /* zone size in blocks */
int zone_count; /* number of zones */
int max_lba; /* maximum lba in a zone */
int smallpagenand; /* 256 bytes/page nand */
int readonly; /* is FS readonly */
int unstable;
int cis_block; /* CIS block location */
int cis_boffset; /* CIS offset in the block */
int cis_page_offset; /* CIS offset in the page */
void *cis_buffer; /* tmp buffer for cis reads */
/* Cache */
int cache_block; /* block number of cached block */
int cache_zone; /* zone of cached block */
unsigned char *cache_data; /* cached block data */
long unsigned int cache_data_invalid_bitmap;
int cache_clean;
struct work_struct flush_work;
struct timer_list timer;
/* Async erase stuff */
struct completion erase_completion;
/* Geometry stuff */
int heads;
int sectors;
int cylinders;
struct attribute_group *disk_attributes;
};
struct chs_entry {
unsigned long size;
unsigned short cyl;
unsigned char head;
unsigned char sec;
};
#define SM_FTL_PARTN_BITS 3
#define sm_printk(format, ...) \
printk(KERN_WARNING "sm_ftl" ": " format "\n", ## __VA_ARGS__)
#define dbg(format, ...) \
if (debug) \
printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
#define dbg_verbose(format, ...) \
if (debug > 1) \
printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
static void sm_erase_callback(struct erase_info *self);
static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block,
int put_free);
static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block);
static int sm_recheck_media(struct sm_ftl *ftl);