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
15 static 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
31 static 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
sm_block_markbad(struct mtd_info * mtd,loff_t ofs)41 static 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
70 static 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
91 static 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
sm_register_device(struct mtd_info * mtd,int smartmedia)103 int 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 }
137 EXPORT_SYMBOL_GPL(sm_register_device);
138
139 MODULE_LICENSE("GPL");
140 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
141 MODULE_DESCRIPTION("Common SmartMedia/xD functions");
142