drivers/mtd/sm_ftl.h

   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
  22 struct 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
  28 struct 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         /* Geometry stuff */
  57         int heads;
  58         int sectors;
  59         int cylinders;
  60
  61         struct attribute_group *disk_attributes;
  62 };
  63
  64 struct chs_entry {
  65         unsigned long size;
  66         unsigned short cyl;
  67         unsigned char head;
  68         unsigned char sec;
  69 };
  70
  71
  72 #define SM_FTL_PARTN_BITS       3
  73
  74 #define sm_printk(format, ...) \
  75         printk(KERN_WARNING "sm_ftl" ": " format "\n", ## __VA_ARGS__)
  76
  77 #define dbg(format, ...) \
  78         if (debug) \
  79                 printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
  80
  81 #define dbg_verbose(format, ...) \
  82         if (debug > 1) \
  83                 printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
  84
  85
  86 static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block,
  87                                                                 int put_free);
  88 static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block);
  89
  90 static int sm_recheck_media(struct sm_ftl *ftl);