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/rawnand.h> 11 #include <linux/module.h> 12 #include <linux/sizes.h> 13 #include "sm_common.h" 14 15 static int oob_sm_ooblayout_ecc(struct mtd_info *mtd, int section, 16 struct mtd_oob_region *oobregion) 17 { 18 if (section > 1) 19 return -ERANGE; 20 21 oobregion->length = 3; 22 oobregion->offset = ((section + 1) * 8) - 3; 23 24 return 0; 25 } 26 27 static int oob_sm_ooblayout_free(struct mtd_info *mtd, int section, 28 struct mtd_oob_region *oobregion) 29 { 30 switch (section) { 31 case 0: 32 /* reserved */ 33 oobregion->offset = 0; 34 oobregion->length = 4; 35 break; 36 case 1: 37 /* LBA1 */ 38 oobregion->offset = 6; 39 oobregion->length = 2; 40 break; 41 case 2: 42 /* LBA2 */ 43 oobregion->offset = 11; 44 oobregion->length = 2; 45 break; 46 default: 47 return -ERANGE; 48 } 49 50 return 0; 51 } 52 53 static const struct mtd_ooblayout_ops oob_sm_ops = { 54 .ecc = oob_sm_ooblayout_ecc, 55 .free = oob_sm_ooblayout_free, 56 }; 57 58 /* NOTE: This layout is is not compatabable with SmartMedia, */ 59 /* because the 256 byte devices have page depenent oob layout */ 60 /* However it does preserve the bad block markers */ 61 /* If you use smftl, it will bypass this and work correctly */ 62 /* If you not, then you break SmartMedia compliance anyway */ 63 64 static int oob_sm_small_ooblayout_ecc(struct mtd_info *mtd, int section, 65 struct mtd_oob_region *oobregion) 66 { 67 if (section) 68 return -ERANGE; 69 70 oobregion->length = 3; 71 oobregion->offset = 0; 72 73 return 0; 74 } 75 76 static int oob_sm_small_ooblayout_free(struct mtd_info *mtd, int section, 77 struct mtd_oob_region *oobregion) 78 { 79 switch (section) { 80 case 0: 81 /* reserved */ 82 oobregion->offset = 3; 83 oobregion->length = 2; 84 break; 85 case 1: 86 /* LBA1 */ 87 oobregion->offset = 6; 88 oobregion->length = 2; 89 break; 90 default: 91 return -ERANGE; 92 } 93 94 return 0; 95 } 96 97 static const struct mtd_ooblayout_ops oob_sm_small_ops = { 98 .ecc = oob_sm_small_ooblayout_ecc, 99 .free = oob_sm_small_ooblayout_free, 100 }; 101 102 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs) 103 { 104 struct mtd_oob_ops ops; 105 struct sm_oob oob; 106 int ret; 107 108 memset(&oob, -1, SM_OOB_SIZE); 109 oob.block_status = 0x0F; 110 111 /* As long as this function is called on erase block boundaries 112 it will work correctly for 256 byte nand */ 113 ops.mode = MTD_OPS_PLACE_OOB; 114 ops.ooboffs = 0; 115 ops.ooblen = mtd->oobsize; 116 ops.oobbuf = (void *)&oob; 117 ops.datbuf = NULL; 118 119 120 ret = mtd_write_oob(mtd, ofs, &ops); 121 if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) { 122 pr_notice("sm_common: can't mark sector at %i as bad\n", 123 (int)ofs); 124 return -EIO; 125 } 126 127 return 0; 128 } 129 130 static struct nand_flash_dev nand_smartmedia_flash_ids[] = { 131 LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM", 0x5d, 2, SZ_8K, NAND_ROM), 132 LEGACY_ID_NAND("SmartMedia 4MiB 3,3V", 0xe3, 4, SZ_8K, 0), 133 LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V", 0xe5, 4, SZ_8K, 0), 134 LEGACY_ID_NAND("SmartMedia 4MiB 5V", 0x6b, 4, SZ_8K, 0), 135 LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM", 0xd5, 4, SZ_8K, NAND_ROM), 136 LEGACY_ID_NAND("SmartMedia 8MiB 3,3V", 0xe6, 8, SZ_8K, 0), 137 LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM", 0xd6, 8, SZ_8K, NAND_ROM), 138 LEGACY_ID_NAND("SmartMedia 16MiB 3,3V", 0x73, 16, SZ_16K, 0), 139 LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM", 0x57, 16, SZ_16K, NAND_ROM), 140 LEGACY_ID_NAND("SmartMedia 32MiB 3,3V", 0x75, 32, SZ_16K, 0), 141 LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM", 0x58, 32, SZ_16K, NAND_ROM), 142 LEGACY_ID_NAND("SmartMedia 64MiB 3,3V", 0x76, 64, SZ_16K, 0), 143 LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM", 0xd9, 64, SZ_16K, NAND_ROM), 144 LEGACY_ID_NAND("SmartMedia 128MiB 3,3V", 0x79, 128, SZ_16K, 0), 145 LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM), 146 LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V", 0x71, 256, SZ_16K, 0), 147 LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM), 148 {NULL} 149 }; 150 151 static struct nand_flash_dev nand_xd_flash_ids[] = { 152 LEGACY_ID_NAND("xD 16MiB 3,3V", 0x73, 16, SZ_16K, 0), 153 LEGACY_ID_NAND("xD 32MiB 3,3V", 0x75, 32, SZ_16K, 0), 154 LEGACY_ID_NAND("xD 64MiB 3,3V", 0x76, 64, SZ_16K, 0), 155 LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128, SZ_16K, 0), 156 LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256, SZ_16K, NAND_BROKEN_XD), 157 LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512, SZ_16K, NAND_BROKEN_XD), 158 LEGACY_ID_NAND("xD 1GiB 3,3V", 0xd3, 1024, SZ_16K, NAND_BROKEN_XD), 159 LEGACY_ID_NAND("xD 2GiB 3,3V", 0xd5, 2048, SZ_16K, NAND_BROKEN_XD), 160 {NULL} 161 }; 162 163 int sm_register_device(struct mtd_info *mtd, int smartmedia) 164 { 165 struct nand_chip *chip = mtd_to_nand(mtd); 166 int ret; 167 168 chip->options |= NAND_SKIP_BBTSCAN; 169 170 /* Scan for card properties */ 171 ret = nand_scan_ident(mtd, 1, smartmedia ? 172 nand_smartmedia_flash_ids : nand_xd_flash_ids); 173 174 if (ret) 175 return ret; 176 177 /* Bad block marker position */ 178 chip->badblockpos = 0x05; 179 chip->badblockbits = 7; 180 chip->block_markbad = sm_block_markbad; 181 182 /* ECC layout */ 183 if (mtd->writesize == SM_SECTOR_SIZE) 184 mtd_set_ooblayout(mtd, &oob_sm_ops); 185 else if (mtd->writesize == SM_SMALL_PAGE) 186 mtd_set_ooblayout(mtd, &oob_sm_small_ops); 187 else 188 return -ENODEV; 189 190 ret = nand_scan_tail(mtd); 191 192 if (ret) 193 return ret; 194 195 return mtd_device_register(mtd, NULL, 0); 196 } 197 EXPORT_SYMBOL_GPL(sm_register_device); 198 199 MODULE_LICENSE("GPL"); 200 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); 201 MODULE_DESCRIPTION("Common SmartMedia/xD functions"); 202