LXR linux/drivers/mtd/sm

   1/*
   2 * Copyright © 2009 - Maxim Levitsky
   3 * SmartMedia/xD translation layer
   4 *
   5 * Based loosly on ssfdc.c which is
   6 *  © 2005 Eptar srl
   7 *  Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/mtd/blktrans.h>
  15#include <linux/kfifo.h>
  16#include <linux/sched.h>
  17#include <linux/completion.h>
  18#include <linux/mtd/mtd.h>
  19
  20
  21
  22struct ftl_zone {
  23        bool initialized;
  24        int16_t *lba_to_phys_table;             /* LBA to physical table */
  25        struct kfifo free_sectors;      /* queue of free sectors */
  26};
  27
  28struct sm_ftl {
  29        struct mtd_blktrans_dev *trans;
  30
  31        struct mutex mutex;             /* protects the structure */
  32        struct ftl_zone *zones;         /* FTL tables for each zone */
  33
  34        /* Media information */
  35        int block_size;                 /* block size in bytes */
  36        int zone_size;                  /* zone size in blocks */
  37        int zone_count;                 /* number of zones */
  38        int max_lba;                    /* maximum lba in a zone */
  39        int smallpagenand;              /* 256 bytes/page nand */
  40        bool readonly;                  /* is FS readonly */
  41        bool unstable;
  42        int cis_block;                  /* CIS block location */
  43        int cis_boffset;                /* CIS offset in the block */
  44        int cis_page_offset;            /* CIS offset in the page */
  45        void *cis_buffer;               /* tmp buffer for cis reads */
  46
  47        /* Cache */
  48        int cache_block;                /* block number of cached block */
  49        int cache_zone;                 /* zone of cached block */
  50        unsigned char *cache_data;      /* cached block data */
  51        long unsigned int cache_data_invalid_bitmap;
  52        bool cache_clean;
  53        struct work_struct flush_work;
  54        struct timer_list timer;
  55
  56        /* Async erase stuff */
  57        struct completion erase_completion;
  58
  59        /* Geometry stuff */
  60        int heads;
  61        int sectors;
  62        int cylinders;
  63
  64        struct attribute_group *disk_attributes;
  65};
  66
  67struct chs_entry {
  68        unsigned long size;
  69        unsigned short cyl;
  70        unsigned char head;
  71        unsigned char sec;
  72};
  73
  74
  75#define SM_FTL_PARTN_BITS       3
  76
  77#define sm_printk(format, ...) \
  78        printk(KERN_WARNING "sm_ftl" ": " format "\n", ## __VA_ARGS__)
  79
  80#define dbg(format, ...) \
  81        if (debug) \
  82                printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
  83
  84#define dbg_verbose(format, ...) \
  85        if (debug > 1) \
  86                printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
  87
  88
  89static void sm_erase_callback(struct erase_info *self);
  90static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block,
  91                                                                int put_free);
  92static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block);
  93
  94static int sm_recheck_media(struct sm_ftl *ftl);
  95