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 <linux/sizes.h> 13#include "sm_common.h" 14 15static struct nand_ecclayout nand_oob_sm = { 16 .eccbytes = 6, 17 .eccpos = {8, 9, 10, 13, 14, 15}, 18 .oobfree = { 19 {.offset = 0 , .length = 4}, /* reserved */ 20 {.offset = 6 , .length = 2}, /* LBA1 */ 21 {.offset = 11, .length = 2} /* LBA2 */ 22 } 23}; 24 25/* NOTE: This layout is is not compatabable with SmartMedia, */ 26/* because the 256 byte devices have page depenent oob layout */ 27/* However it does preserve the bad block markers */ 28/* If you use smftl, it will bypass this and work correctly */ 29/* If you not, then you break SmartMedia compliance anyway */ 30 31static struct nand_ecclayout nand_oob_sm_small = { 32 .eccbytes = 3, 33 .eccpos = {0, 1, 2}, 34 .oobfree = { 35 {.offset = 3 , .length = 2}, /* reserved */ 36 {.offset = 6 , .length = 2}, /* LBA1 */ 37 } 38}; 39 40 41static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs) 42{ 43 struct mtd_oob_ops ops; 44 struct sm_oob oob; 45 int ret; 46 47 memset(&oob, -1, SM_OOB_SIZE); 48 oob.block_status = 0x0F; 49 50 /* As long as this function is called on erase block boundaries 51 it will work correctly for 256 byte nand */ 52 ops.mode = MTD_OPS_PLACE_OOB; 53 ops.ooboffs = 0; 54 ops.ooblen = mtd->oobsize; 55 ops.oobbuf = (void *)&oob; 56 ops.datbuf = NULL; 57 58 59 ret = mtd_write_oob(mtd, ofs, &ops); 60 if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) { 61 printk(KERN_NOTICE 62 "sm_common: can't mark sector at %i as bad\n", 63 (int)ofs); 64 return -EIO; 65 } 66 67 return 0; 68} 69 70static struct nand_flash_dev nand_smartmedia_flash_ids[] = { 71 LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM", 0x5d, 2, SZ_8K, NAND_ROM), 72 LEGACY_ID_NAND("SmartMedia 4MiB 3,3V", 0xe3, 4, SZ_8K, 0), 73 LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V", 0xe5, 4, SZ_8K, 0), 74 LEGACY_ID_NAND("SmartMedia 4MiB 5V", 0x6b, 4, SZ_8K, 0), 75 LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM", 0xd5, 4, SZ_8K, NAND_ROM), 76 LEGACY_ID_NAND("SmartMedia 8MiB 3,3V", 0xe6, 8, SZ_8K, 0), 77 LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM", 0xd6, 8, SZ_8K, NAND_ROM), 78 LEGACY_ID_NAND("SmartMedia 16MiB 3,3V", 0x73, 16, SZ_16K, 0), 79 LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM", 0x57, 16, SZ_16K, NAND_ROM), 80 LEGACY_ID_NAND("SmartMedia 32MiB 3,3V", 0x75, 32, SZ_16K, 0), 81 LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM", 0x58, 32, SZ_16K, NAND_ROM), 82 LEGACY_ID_NAND("SmartMedia 64MiB 3,3V", 0x76, 64, SZ_16K, 0), 83 LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM", 0xd9, 64, SZ_16K, NAND_ROM), 84 LEGACY_ID_NAND("SmartMedia 128MiB 3,3V", 0x79, 128, SZ_16K, 0), 85 LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM), 86 LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V", 0x71, 256, SZ_16K, 0), 87 LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM), 88 {NULL} 89}; 90 91static struct nand_flash_dev nand_xd_flash_ids[] = { 92 LEGACY_ID_NAND("xD 16MiB 3,3V", 0x73, 16, SZ_16K, 0), 93 LEGACY_ID_NAND("xD 32MiB 3,3V", 0x75, 32, SZ_16K, 0), 94 LEGACY_ID_NAND("xD 64MiB 3,3V", 0x76, 64, SZ_16K, 0), 95 LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128, SZ_16K, 0), 96 LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256, SZ_16K, NAND_BROKEN_XD), 97 LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512, SZ_16K, NAND_BROKEN_XD), 98 LEGACY_ID_NAND("xD 1GiB 3,3V", 0xd3, 1024, SZ_16K, NAND_BROKEN_XD), 99 LEGACY_ID_NAND("xD 2GiB 3,3V", 0xd5, 2048, SZ_16K, NAND_BROKEN_XD), 100 {NULL} 101}; 102 103int sm_register_device(struct mtd_info *mtd, int smartmedia) 104{ 105 struct nand_chip *chip = mtd->priv; 106 int ret; 107 108 chip->options |= NAND_SKIP_BBTSCAN; 109 110 /* Scan for card properties */ 111 ret = nand_scan_ident(mtd, 1, smartmedia ? 112 nand_smartmedia_flash_ids : nand_xd_flash_ids); 113 114 if (ret) 115 return ret; 116 117 /* Bad block marker position */ 118 chip->badblockpos = 0x05; 119 chip->badblockbits = 7; 120 chip->block_markbad = sm_block_markbad; 121 122 /* ECC layout */ 123 if (mtd->writesize == SM_SECTOR_SIZE) 124 chip->ecc.layout = &nand_oob_sm; 125 else if (mtd->writesize == SM_SMALL_PAGE) 126 chip->ecc.layout = &nand_oob_sm_small; 127 else 128 return -ENODEV; 129 130 ret = nand_scan_tail(mtd); 131 132 if (ret) 133 return ret; 134 135 return mtd_device_register(mtd, NULL, 0); 136} 137EXPORT_SYMBOL_GPL(sm_register_device); 138 139MODULE_LICENSE("GPL"); 140MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); 141MODULE_DESCRIPTION("Common SmartMedia/xD functions"); 142