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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [mtd/] [rfd_ftl.c] - Blame information for rev 62

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/*
 * rfd_ftl.c -- resident flash disk (flash translation layer)
 *
 * Copyright (C) 2005  Sean Young <sean@mess.org>
 *
 * $Id: rfd_ftl.c,v 1.8 2006/01/15 12:51:44 sean Exp $
 *
 * This type of flash translation layer (FTL) is used by the Embedded BIOS
 * by General Software. It is known as the Resident Flash Disk (RFD), see:
 *
 *      http://www.gensw.com/pages/prod/bios/rfd.htm
 *
 * based on ftl.c
 */
 
#include <linux/hdreg.h>
#include <linux/init.h>
#include <linux/mtd/blktrans.h>
#include <linux/mtd/mtd.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
 
#include <asm/types.h>
 
#define const_cpu_to_le16       __constant_cpu_to_le16
 
static int block_size = 0;
module_param(block_size, int, 0);
MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");
 
#define PREFIX "rfd_ftl: "
 
/* This major has been assigned by device@lanana.org */
#ifndef RFD_FTL_MAJOR
#define RFD_FTL_MAJOR           256
#endif
 
/* Maximum number of partitions in an FTL region */
#define PART_BITS               4
 
/* An erase unit should start with this value */
#define RFD_MAGIC               0x9193
 
/* the second value is 0xffff or 0xffc8; function unknown */
 
/* the third value is always 0xffff, ignored */
 
/* next is an array of mapping for each corresponding sector */
#define HEADER_MAP_OFFSET       3
#define SECTOR_DELETED          0x0000
#define SECTOR_ZERO             0xfffe
#define SECTOR_FREE             0xffff
 
#define SECTOR_SIZE             512
 
#define SECTORS_PER_TRACK       63
 
struct block {
        enum {
                BLOCK_OK,
                BLOCK_ERASING,
                BLOCK_ERASED,
                BLOCK_UNUSED,
                BLOCK_FAILED
        } state;
        int free_sectors;
        int used_sectors;
        int erases;
        u_long offset;
};
 
struct partition {
        struct mtd_blktrans_dev mbd;
 
        u_int block_size;               /* size of erase unit */
        u_int total_blocks;             /* number of erase units */
        u_int header_sectors_per_block; /* header sectors in erase unit */
        u_int data_sectors_per_block;   /* data sectors in erase unit */
        u_int sector_count;             /* sectors in translated disk */
        u_int header_size;              /* bytes in header sector */
        int reserved_block;             /* block next up for reclaim */
        int current_block;              /* block to write to */
        u16 *header_cache;              /* cached header */
 
        int is_reclaiming;
        int cylinders;
        int errors;
        u_long *sector_map;
        struct block *blocks;
};
 
static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf);
 
static int build_block_map(struct partition *part, int block_no)
{
        struct block *block = &part->blocks[block_no];
        int i;
 
        block->offset = part->block_size * block_no;
 
        if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) {
                block->state = BLOCK_UNUSED;
                return -ENOENT;
        }
 
        block->state = BLOCK_OK;
 
        for (i=0; i<part->data_sectors_per_block; i++) {
                u16 entry;
 
                entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
 
                if (entry == SECTOR_DELETED)
                        continue;
 
                if (entry == SECTOR_FREE) {
                        block->free_sectors++;
                        continue;
                }
 
                if (entry == SECTOR_ZERO)
                        entry = 0;
 
                if (entry >= part->sector_count) {
                        printk(KERN_WARNING PREFIX
                                "'%s': unit #%d: entry %d corrupt, "
                                "sector %d out of range\n",
                                part->mbd.mtd->name, block_no, i, entry);
                        continue;
                }
 
                if (part->sector_map[entry] != -1) {
                        printk(KERN_WARNING PREFIX
                                "'%s': more than one entry for sector %d\n",
                                part->mbd.mtd->name, entry);
                        part->errors = 1;
                        continue;
                }
 
                part->sector_map[entry] = block->offset +
                        (i + part->header_sectors_per_block) * SECTOR_SIZE;
 
                block->used_sectors++;
        }
 
        if (block->free_sectors == part->data_sectors_per_block)
                part->reserved_block = block_no;
 
        return 0;
}
 
static int scan_header(struct partition *part)
{
        int sectors_per_block;
        int i, rc = -ENOMEM;
        int blocks_found;
        size_t retlen;
 
        sectors_per_block = part->block_size / SECTOR_SIZE;
        part->total_blocks = part->mbd.mtd->size / part->block_size;
 
        if (part->total_blocks < 2)
                return -ENOENT;
 
        /* each erase block has three bytes header, followed by the map */
        part->header_sectors_per_block =
                        ((HEADER_MAP_OFFSET + sectors_per_block) *
                        sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
 
        part->data_sectors_per_block = sectors_per_block -
                        part->header_sectors_per_block;
 
        part->header_size = (HEADER_MAP_OFFSET +
                        part->data_sectors_per_block) * sizeof(u16);
 
        part->cylinders = (part->data_sectors_per_block *
                        (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
 
        part->sector_count = part->cylinders * SECTORS_PER_TRACK;
 
        part->current_block = -1;
        part->reserved_block = -1;
        part->is_reclaiming = 0;
 
        part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
        if (!part->header_cache)
                goto err;
 
        part->blocks = kcalloc(part->total_blocks, sizeof(struct block),
                        GFP_KERNEL);
        if (!part->blocks)
                goto err;
 
        part->sector_map = vmalloc(part->sector_count * sizeof(u_long));
        if (!part->sector_map) {
                printk(KERN_ERR PREFIX "'%s': unable to allocate memory for "
                        "sector map", part->mbd.mtd->name);
                goto err;
        }
 
        for (i=0; i<part->sector_count; i++)
                part->sector_map[i] = -1;
 
        for (i=0, blocks_found=0; i<part->total_blocks; i++) {
                rc = part->mbd.mtd->read(part->mbd.mtd,
                                i * part->block_size, part->header_size,
                                &retlen, (u_char*)part->header_cache);
 
                if (!rc && retlen != part->header_size)
                        rc = -EIO;
 
                if (rc)
                        goto err;
 
                if (!build_block_map(part, i))
                        blocks_found++;
        }
 
        if (blocks_found == 0) {
                printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
                                part->mbd.mtd->name);
                rc = -ENOENT;
                goto err;
        }
 
        if (part->reserved_block == -1) {
                printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n",
                                part->mbd.mtd->name);
 
                part->errors = 1;
        }
 
        return 0;
 
err:
        vfree(part->sector_map);
        kfree(part->header_cache);
        kfree(part->blocks);
 
        return rc;
}
 
static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
{
        struct partition *part = (struct partition*)dev;
        u_long addr;
        size_t retlen;
        int rc;
 
        if (sector >= part->sector_count)
                return -EIO;
 
        addr = part->sector_map[sector];
        if (addr != -1) {
                rc = part->mbd.mtd->read(part->mbd.mtd, addr, SECTOR_SIZE,
                                                &retlen, (u_char*)buf);
                if (!rc && retlen != SECTOR_SIZE)
                        rc = -EIO;
 
                if (rc) {
                        printk(KERN_WARNING PREFIX "error reading '%s' at "
                                "0x%lx\n", part->mbd.mtd->name, addr);
                        return rc;
                }
        } else
                memset(buf, 0, SECTOR_SIZE);
 
        return 0;
}
 
static void erase_callback(struct erase_info *erase)
{
        struct partition *part;
        u16 magic;
        int i, rc;
        size_t retlen;
 
        part = (struct partition*)erase->priv;
 
        i = erase->addr / part->block_size;
        if (i >= part->total_blocks || part->blocks[i].offset != erase->addr) {
                printk(KERN_ERR PREFIX "erase callback for unknown offset %x "
                                "on '%s'\n", erase->addr, part->mbd.mtd->name);
                return;
        }
 
        if (erase->state != MTD_ERASE_DONE) {
                printk(KERN_WARNING PREFIX "erase failed at 0x%x on '%s', "
                                "state %d\n", erase->addr,
                                part->mbd.mtd->name, erase->state);
 
                part->blocks[i].state = BLOCK_FAILED;
                part->blocks[i].free_sectors = 0;
                part->blocks[i].used_sectors = 0;
 
                kfree(erase);
 
                return;
        }
 
        magic = const_cpu_to_le16(RFD_MAGIC);
 
        part->blocks[i].state = BLOCK_ERASED;
        part->blocks[i].free_sectors = part->data_sectors_per_block;
        part->blocks[i].used_sectors = 0;
        part->blocks[i].erases++;
 
        rc = part->mbd.mtd->write(part->mbd.mtd,
                part->blocks[i].offset, sizeof(magic), &retlen,
                (u_char*)&magic);
 
        if (!rc && retlen != sizeof(magic))
                rc = -EIO;
 
        if (rc) {
                printk(KERN_ERR PREFIX "'%s': unable to write RFD "
                                "header at 0x%lx\n",
                                part->mbd.mtd->name,
                                part->blocks[i].offset);
                part->blocks[i].state = BLOCK_FAILED;
        }
        else
                part->blocks[i].state = BLOCK_OK;
 
        kfree(erase);
}
 
static int erase_block(struct partition *part, int block)
{
        struct erase_info *erase;
        int rc = -ENOMEM;
 
        erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
        if (!erase)
                goto err;
 
        erase->mtd = part->mbd.mtd;
        erase->callback = erase_callback;
        erase->addr = part->blocks[block].offset;
        erase->len = part->block_size;
        erase->priv = (u_long)part;
 
        part->blocks[block].state = BLOCK_ERASING;
        part->blocks[block].free_sectors = 0;
 
        rc = part->mbd.mtd->erase(part->mbd.mtd, erase);
 
        if (rc) {
                printk(KERN_ERR PREFIX "erase of region %x,%x on '%s' "
                                "failed\n", erase->addr, erase->len,
                                part->mbd.mtd->name);
                kfree(erase);
        }
 
err:
        return rc;
}
 
static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
{
        void *sector_data;
        u16 *map;
        size_t retlen;
        int i, rc = -ENOMEM;
 
        part->is_reclaiming = 1;
 
        sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
        if (!sector_data)
                goto err3;
 
        map = kmalloc(part->header_size, GFP_KERNEL);
        if (!map)
                goto err2;
 
        rc = part->mbd.mtd->read(part->mbd.mtd,
                part->blocks[block_no].offset, part->header_size,
                &retlen, (u_char*)map);
 
        if (!rc && retlen != part->header_size)
                rc = -EIO;
 
        if (rc) {
                printk(KERN_ERR PREFIX "error reading '%s' at "
                        "0x%lx\n", part->mbd.mtd->name,
                        part->blocks[block_no].offset);
 
                goto err;
        }
 
        for (i=0; i<part->data_sectors_per_block; i++) {
                u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
                u_long addr;
 
 
                if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
                        continue;
 
                if (entry == SECTOR_ZERO)
                        entry = 0;
 
                /* already warned about and ignored in build_block_map() */
                if (entry >= part->sector_count)
                        continue;
 
                addr = part->blocks[block_no].offset +
                        (i + part->header_sectors_per_block) * SECTOR_SIZE;
 
                if (*old_sector == addr) {
                        *old_sector = -1;
                        if (!part->blocks[block_no].used_sectors--) {
                                rc = erase_block(part, block_no);
                                break;
                        }
                        continue;
                }
                rc = part->mbd.mtd->read(part->mbd.mtd, addr,
                        SECTOR_SIZE, &retlen, sector_data);
 
                if (!rc && retlen != SECTOR_SIZE)
                        rc = -EIO;
 
                if (rc) {
                        printk(KERN_ERR PREFIX "'%s': Unable to "
                                "read sector for relocation\n",
                                part->mbd.mtd->name);
 
                        goto err;
                }
 
                rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
                                entry, sector_data);
 
                if (rc)
                        goto err;
        }
 
err:
        kfree(map);
err2:
        kfree(sector_data);
err3:
        part->is_reclaiming = 0;
 
        return rc;
}
 
static int reclaim_block(struct partition *part, u_long *old_sector)
{
        int block, best_block, score, old_sector_block;
        int rc;
 
        /* we have a race if sync doesn't exist */
        if (part->mbd.mtd->sync)
                part->mbd.mtd->sync(part->mbd.mtd);
 
        score = 0x7fffffff; /* MAX_INT */
        best_block = -1;
        if (*old_sector != -1)
                old_sector_block = *old_sector / part->block_size;
        else
                old_sector_block = -1;
 
        for (block=0; block<part->total_blocks; block++) {
                int this_score;
 
                if (block == part->reserved_block)
                        continue;
 
                /*
                 * Postpone reclaiming if there is a free sector as
                 * more removed sectors is more efficient (have to move
                 * less).
                 */
                if (part->blocks[block].free_sectors)
                        return 0;
 
                this_score = part->blocks[block].used_sectors;
 
                if (block == old_sector_block)
                        this_score--;
                else {
                        /* no point in moving a full block */
                        if (part->blocks[block].used_sectors ==
                                        part->data_sectors_per_block)
                                continue;
                }
 
                this_score += part->blocks[block].erases;
 
                if (this_score < score) {
                        best_block = block;
                        score = this_score;
                }
        }
 
        if (best_block == -1)
                return -ENOSPC;
 
        part->current_block = -1;
        part->reserved_block = best_block;
 
        pr_debug("reclaim_block: reclaiming block #%d with %d used "
                 "%d free sectors\n", best_block,
                 part->blocks[best_block].used_sectors,
                 part->blocks[best_block].free_sectors);
 
        if (part->blocks[best_block].used_sectors)
                rc = move_block_contents(part, best_block, old_sector);
        else
                rc = erase_block(part, best_block);
 
        return rc;
}
 
/*
 * IMPROVE: It would be best to choose the block with the most deleted sectors,
 * because if we fill that one up first it'll have the most chance of having
 * the least live sectors at reclaim.
 */
static int find_free_block(struct partition *part)
{
        int block, stop;
 
        block = part->current_block == -1 ?
                        jiffies % part->total_blocks : part->current_block;
        stop = block;
 
        do {
                if (part->blocks[block].free_sectors &&
                                block != part->reserved_block)
                        return block;
 
                if (part->blocks[block].state == BLOCK_UNUSED)
                        erase_block(part, block);
 
                if (++block >= part->total_blocks)
                        block = 0;
 
        } while (block != stop);
 
        return -1;
}
 
static int find_writable_block(struct partition *part, u_long *old_sector)
{
        int rc, block;
        size_t retlen;
 
        block = find_free_block(part);
 
        if (block == -1) {
                if (!part->is_reclaiming) {
                        rc = reclaim_block(part, old_sector);
                        if (rc)
                                goto err;
 
                        block = find_free_block(part);
                }
 
                if (block == -1) {
                        rc = -ENOSPC;
                        goto err;
                }
        }
 
        rc = part->mbd.mtd->read(part->mbd.mtd, part->blocks[block].offset,
                part->header_size, &retlen, (u_char*)part->header_cache);
 
        if (!rc && retlen != part->header_size)
                rc = -EIO;
 
        if (rc) {
                printk(KERN_ERR PREFIX "'%s': unable to read header at "
                                "0x%lx\n", part->mbd.mtd->name,
                                part->blocks[block].offset);
                goto err;
        }
 
        part->current_block = block;
 
err:
        return rc;
}
 
static int mark_sector_deleted(struct partition *part, u_long old_addr)
{
        int block, offset, rc;
        u_long addr;
        size_t retlen;
        u16 del = const_cpu_to_le16(SECTOR_DELETED);
 
        block = old_addr / part->block_size;
        offset = (old_addr % part->block_size) / SECTOR_SIZE -
                part->header_sectors_per_block;
 
        addr = part->blocks[block].offset +
                        (HEADER_MAP_OFFSET + offset) * sizeof(u16);
        rc = part->mbd.mtd->write(part->mbd.mtd, addr,
                sizeof(del), &retlen, (u_char*)&del);
 
        if (!rc && retlen != sizeof(del))
                rc = -EIO;
 
        if (rc) {
                printk(KERN_ERR PREFIX "error writing '%s' at "
                        "0x%lx\n", part->mbd.mtd->name, addr);
                if (rc)
                        goto err;
        }
        if (block == part->current_block)
                part->header_cache[offset + HEADER_MAP_OFFSET] = del;
 
        part->blocks[block].used_sectors--;
 
        if (!part->blocks[block].used_sectors &&
            !part->blocks[block].free_sectors)
                rc = erase_block(part, block);
 
err:
        return rc;
}
 
static int find_free_sector(const struct partition *part, const struct block *block)
{
        int i, stop;
 
        i = stop = part->data_sectors_per_block - block->free_sectors;
 
        do {
                if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i])
                                == SECTOR_FREE)
                        return i;
 
                if (++i == part->data_sectors_per_block)
                        i = 0;
        }
        while(i != stop);
 
        return -1;
}
 
static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr)
{
        struct partition *part = (struct partition*)dev;
        struct block *block;
        u_long addr;
        int i;
        int rc;
        size_t retlen;
        u16 entry;
 
        if (part->current_block == -1 ||
                !part->blocks[part->current_block].free_sectors) {
 
                rc = find_writable_block(part, old_addr);
                if (rc)
                        goto err;
        }
 
        block = &part->blocks[part->current_block];
 
        i = find_free_sector(part, block);
 
        if (i < 0) {
                rc = -ENOSPC;
                goto err;
        }
 
        addr = (i + part->header_sectors_per_block) * SECTOR_SIZE +
                block->offset;
        rc = part->mbd.mtd->write(part->mbd.mtd,
                addr, SECTOR_SIZE, &retlen, (u_char*)buf);
 
        if (!rc && retlen != SECTOR_SIZE)
                rc = -EIO;
 
        if (rc) {
                printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
                                part->mbd.mtd->name, addr);
                if (rc)
                        goto err;
        }
 
        part->sector_map[sector] = addr;
 
        entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector);
 
        part->header_cache[i + HEADER_MAP_OFFSET] = entry;
 
        addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16);
        rc = part->mbd.mtd->write(part->mbd.mtd, addr,
                        sizeof(entry), &retlen, (u_char*)&entry);
 
        if (!rc && retlen != sizeof(entry))
                rc = -EIO;
 
        if (rc) {
                printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
                                part->mbd.mtd->name, addr);
                if (rc)
                        goto err;
        }
        block->used_sectors++;
        block->free_sectors--;
 
err:
        return rc;
}
 
static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
{
        struct partition *part = (struct partition*)dev;
        u_long old_addr;
        int i;
        int rc = 0;
 
        pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector);
 
        if (part->reserved_block == -1) {
                rc = -EACCES;
                goto err;
        }
 
        if (sector >= part->sector_count) {
                rc = -EIO;
                goto err;
        }
 
        old_addr = part->sector_map[sector];
 
        for (i=0; i<SECTOR_SIZE; i++) {
                if (!buf[i])
                        continue;
 
                rc = do_writesect(dev, sector, buf, &old_addr);
                if (rc)
                        goto err;
                break;
        }
 
        if (i == SECTOR_SIZE)
                part->sector_map[sector] = -1;
 
        if (old_addr != -1)
                rc = mark_sector_deleted(part, old_addr);
 
err:
        return rc;
}
 
static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
{
        struct partition *part = (struct partition*)dev;
 
        geo->heads = 1;
        geo->sectors = SECTORS_PER_TRACK;
        geo->cylinders = part->cylinders;
 
        return 0;
}
 
static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
{
        struct partition *part;
 
        if (mtd->type != MTD_NORFLASH)
                return;
 
        part = kzalloc(sizeof(struct partition), GFP_KERNEL);
        if (!part)
                return;
 
        part->mbd.mtd = mtd;
 
        if (block_size)
                part->block_size = block_size;
        else {
                if (!mtd->erasesize) {
                        printk(KERN_WARNING PREFIX "please provide block_size");
                        goto out;
                } else
                        part->block_size = mtd->erasesize;
        }
 
        if (scan_header(part) == 0) {
                part->mbd.size = part->sector_count;
                part->mbd.tr = tr;
                part->mbd.devnum = -1;
                if (!(mtd->flags & MTD_WRITEABLE))
                        part->mbd.readonly = 1;
                else if (part->errors) {
                        printk(KERN_WARNING PREFIX "'%s': errors found, "
                                        "setting read-only\n", mtd->name);
                        part->mbd.readonly = 1;
                }
 
                printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
                                mtd->name, mtd->type, mtd->flags);
 
                if (!add_mtd_blktrans_dev((void*)part))
                        return;
        }
out:
        kfree(part);
}
 
static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
{
        struct partition *part = (struct partition*)dev;
        int i;
 
        for (i=0; i<part->total_blocks; i++) {
                pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n",
                        part->mbd.mtd->name, i, part->blocks[i].erases);
        }
 
        del_mtd_blktrans_dev(dev);
        vfree(part->sector_map);
        kfree(part->header_cache);
        kfree(part->blocks);
        kfree(part);
}
 
struct mtd_blktrans_ops rfd_ftl_tr = {
        .name           = "rfd",
        .major          = RFD_FTL_MAJOR,
        .part_bits      = PART_BITS,
        .blksize        = SECTOR_SIZE,
 
        .readsect       = rfd_ftl_readsect,
        .writesect      = rfd_ftl_writesect,
        .getgeo         = rfd_ftl_getgeo,
        .add_mtd        = rfd_ftl_add_mtd,
        .remove_dev     = rfd_ftl_remove_dev,
        .owner          = THIS_MODULE,
};
 
static int __init init_rfd_ftl(void)
{
        return register_mtd_blktrans(&rfd_ftl_tr);
}
 
static void __exit cleanup_rfd_ftl(void)
{
        deregister_mtd_blktrans(&rfd_ftl_tr);
}
 
module_init(init_rfd_ftl);
module_exit(cleanup_rfd_ftl);
 
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sean Young <sean@mess.org>");
MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
                "used by General Software's Embedded BIOS");
 
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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [mtd/] [rfd_ftl.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* rfd_ftl.c -- resident flash disk (flash translation layer)`
3			`*`
4			`* Copyright (C) 2005 Sean Young <sean@mess.org>`
5			`*`
6			`* $Id: rfd_ftl.c,v 1.8 2006/01/15 12:51:44 sean Exp $`
7			`*`
8			`* This type of flash translation layer (FTL) is used by the Embedded BIOS`
9			`* by General Software. It is known as the Resident Flash Disk (RFD), see:`
10			`*`
11			`* http://www.gensw.com/pages/prod/bios/rfd.htm`
12			`*`
13			`* based on ftl.c`
14			`*/`
15
16			`#include <linux/hdreg.h>`
17			`#include <linux/init.h>`
18			`#include <linux/mtd/blktrans.h>`
19			`#include <linux/mtd/mtd.h>`
20			`#include <linux/vmalloc.h>`
21			`#include <linux/slab.h>`
22			`#include <linux/jiffies.h>`
23
24			`#include <asm/types.h>`
25
26			`#define const_cpu_to_le16 __constant_cpu_to_le16`
27
28			`static int block_size = 0;`
29			`module_param(block_size, int, 0);`
30			`MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");`
31
32			`#define PREFIX "rfd_ftl: "`
33
34			`/* This major has been assigned by device@lanana.org */`
35			`#ifndef RFD_FTL_MAJOR`
36			`#define RFD_FTL_MAJOR 256`
37			`#endif`
38
39			`/* Maximum number of partitions in an FTL region */`
40			`#define PART_BITS 4`