sm_ftl.h

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/*
 * Copyright © 2009 - Maxim Levitsky
 * SmartMedia/xD translation layer
 *
 * Based loosly on ssfdc.c which is
 *  © 2005 Eptar srl
 *  Author: Claudio Lanconelli <[email protected]>
 *
 * 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 {
    bool 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 */
    bool readonly;          /* is FS readonly */
    bool 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;
    bool 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);