drivers/mtd/nand/sm_common.c

   1 /*
   2  * Copyright © 2009 - Maxim Levitsky
   3  * Common routines & support for xD format
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/mtd/nand.h>
  11 #include <linux/module.h>
  12 #include "sm_common.h"
  13
  14 static struct nand_ecclayout nand_oob_sm = {
  15         .eccbytes = 6,
  16         .eccpos = {8, 9, 10, 13, 14, 15},
  17         .oobfree = {
  18                 {.offset = 0 , .length = 4}, /* reserved */
  19                 {.offset = 6 , .length = 2}, /* LBA1 */
  20                 {.offset = 11, .length = 2}  /* LBA2 */
  21         }
  22 };
  23
  24 /* NOTE: This layout is is not compatabable with SmartMedia, */
  25 /* because the 256 byte devices have page depenent oob layout */
  26 /* However it does preserve the bad block markers */
  27 /* If you use smftl, it will bypass this and work correctly */
  28 /* If you not, then you break SmartMedia compliance anyway */
  29
  30 static struct nand_ecclayout nand_oob_sm_small = {
  31         .eccbytes = 3,
  32         .eccpos = {0, 1, 2},
  33         .oobfree = {
  34                 {.offset = 3 , .length = 2}, /* reserved */
  35                 {.offset = 6 , .length = 2}, /* LBA1 */
  36         }
  37 };
  38
  39
  40 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
  41 {
  42         struct mtd_oob_ops ops;
  43         struct sm_oob oob;
  44         int ret, error = 0;
  45
  46         memset(&oob, -1, SM_OOB_SIZE);
  47         oob.block_status = 0x0F;
  48
  49         /* As long as this function is called on erase block boundaries
  50                 it will work correctly for 256 byte nand */
  51         ops.mode = MTD_OPS_PLACE_OOB;
  52         ops.ooboffs = 0;
  53         ops.ooblen = mtd->oobsize;
  54         ops.oobbuf = (void *)&oob;
  55         ops.datbuf = NULL;
  56
  57
  58         ret = mtd_write_oob(mtd, ofs, &ops);
  59         if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
  60                 printk(KERN_NOTICE
  61                         "sm_common: can't mark sector at %i as bad\n",
  62                                                                 (int)ofs);
  63                 error = -EIO;
  64         } else
  65                 mtd->ecc_stats.badblocks++;
  66
  67         return error;
  68 }
  69
  70
  71 static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
  72         {"SmartMedia 1MiB 5V",          0x6e, 256, 1, 0x1000, 0},
  73         {"SmartMedia 1MiB 3,3V",        0xe8, 256, 1, 0x1000, 0},
  74         {"SmartMedia 1MiB 3,3V",        0xec, 256, 1, 0x1000, 0},
  75         {"SmartMedia 2MiB 3,3V",        0xea, 256, 2, 0x1000, 0},
  76         {"SmartMedia 2MiB 5V",          0x64, 256, 2, 0x1000, 0},
  77         {"SmartMedia 2MiB 3,3V ROM",    0x5d, 512, 2, 0x2000, NAND_ROM},
  78         {"SmartMedia 4MiB 3,3V",        0xe3, 512, 4, 0x2000, 0},
  79         {"SmartMedia 4MiB 3,3/5V",      0xe5, 512, 4, 0x2000, 0},
  80         {"SmartMedia 4MiB 5V",          0x6b, 512, 4, 0x2000, 0},
  81         {"SmartMedia 4MiB 3,3V ROM",    0xd5, 512, 4, 0x2000, NAND_ROM},
  82         {"SmartMedia 8MiB 3,3V",        0xe6, 512, 8, 0x2000, 0},
  83         {"SmartMedia 8MiB 3,3V ROM",    0xd6, 512, 8, 0x2000, NAND_ROM},
  84         {"SmartMedia 16MiB 3,3V",       0x73, 512, 16, 0x4000, 0},
  85         {"SmartMedia 16MiB 3,3V ROM",   0x57, 512, 16, 0x4000, NAND_ROM},
  86         {"SmartMedia 32MiB 3,3V",       0x75, 512, 32, 0x4000, 0},
  87         {"SmartMedia 32MiB 3,3V ROM",   0x58, 512, 32, 0x4000, NAND_ROM},
  88         {"SmartMedia 64MiB 3,3V",       0x76, 512, 64, 0x4000, 0},
  89         {"SmartMedia 64MiB 3,3V ROM",   0xd9, 512, 64, 0x4000, NAND_ROM},
  90         {"SmartMedia 128MiB 3,3V",      0x79, 512, 128, 0x4000, 0},
  91         {"SmartMedia 128MiB 3,3V ROM",  0xda, 512, 128, 0x4000, NAND_ROM},
  92         {"SmartMedia 256MiB 3,3V",      0x71, 512, 256, 0x4000 },
  93         {"SmartMedia 256MiB 3,3V ROM",  0x5b, 512, 256, 0x4000, NAND_ROM},
  94         {NULL,}
  95 };
  96
  97 #define XD_TYPEM       (NAND_NO_AUTOINCR | NAND_BROKEN_XD)
  98 static struct nand_flash_dev nand_xd_flash_ids[] = {
  99
 100         {"xD 16MiB 3,3V",    0x73, 512, 16, 0x4000, 0},
 101         {"xD 32MiB 3,3V",    0x75, 512, 32, 0x4000, 0},
 102         {"xD 64MiB 3,3V",    0x76, 512, 64, 0x4000, 0},
 103         {"xD 128MiB 3,3V",   0x79, 512, 128, 0x4000, 0},
 104         {"xD 256MiB 3,3V",   0x71, 512, 256, 0x4000, XD_TYPEM},
 105         {"xD 512MiB 3,3V",   0xdc, 512, 512, 0x4000, XD_TYPEM},
 106         {"xD 1GiB 3,3V",     0xd3, 512, 1024, 0x4000, XD_TYPEM},
 107         {"xD 2GiB 3,3V",     0xd5, 512, 2048, 0x4000, XD_TYPEM},
 108         {NULL,}
 109 };
 110
 111 int sm_register_device(struct mtd_info *mtd, int smartmedia)
 112 {
 113         struct nand_chip *chip = mtd->priv;
 114         int ret;
 115
 116         chip->options |= NAND_SKIP_BBTSCAN;
 117
 118         /* Scan for card properties */
 119         ret = nand_scan_ident(mtd, 1, smartmedia ?
 120                 nand_smartmedia_flash_ids : nand_xd_flash_ids);
 121
 122         if (ret)
 123                 return ret;
 124
 125         /* Bad block marker position */
 126         chip->badblockpos = 0x05;
 127         chip->badblockbits = 7;
 128         chip->block_markbad = sm_block_markbad;
 129
 130         /* ECC layout */
 131         if (mtd->writesize == SM_SECTOR_SIZE)
 132                 chip->ecc.layout = &nand_oob_sm;
 133         else if (mtd->writesize == SM_SMALL_PAGE)
 134                 chip->ecc.layout = &nand_oob_sm_small;
 135         else
 136                 return -ENODEV;
 137
 138         ret = nand_scan_tail(mtd);
 139
 140         if (ret)
 141                 return ret;
 142
 143         return mtd_device_register(mtd, NULL, 0);
 144 }
 145 EXPORT_SYMBOL_GPL(sm_register_device);
 146
 147 MODULE_LICENSE("GPL");
 148 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
 149 MODULE_DESCRIPTION("Common SmartMedia/xD functions");