tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 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
27static 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
53static 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
64static 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
76static 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
97static 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
102static 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 printk(KERN_NOTICE
123 "sm_common: can't mark sector at %i as bad\n",
124 (int)ofs);
125 return -EIO;
126 }
127
128 return 0;
129}
130
131static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
132 LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM", 0x5d, 2, SZ_8K, NAND_ROM),
133 LEGACY_ID_NAND("SmartMedia 4MiB 3,3V", 0xe3, 4, SZ_8K, 0),
134 LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V", 0xe5, 4, SZ_8K, 0),
135 LEGACY_ID_NAND("SmartMedia 4MiB 5V", 0x6b, 4, SZ_8K, 0),
136 LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM", 0xd5, 4, SZ_8K, NAND_ROM),
137 LEGACY_ID_NAND("SmartMedia 8MiB 3,3V", 0xe6, 8, SZ_8K, 0),
138 LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM", 0xd6, 8, SZ_8K, NAND_ROM),
139 LEGACY_ID_NAND("SmartMedia 16MiB 3,3V", 0x73, 16, SZ_16K, 0),
140 LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM", 0x57, 16, SZ_16K, NAND_ROM),
141 LEGACY_ID_NAND("SmartMedia 32MiB 3,3V", 0x75, 32, SZ_16K, 0),
142 LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM", 0x58, 32, SZ_16K, NAND_ROM),
143 LEGACY_ID_NAND("SmartMedia 64MiB 3,3V", 0x76, 64, SZ_16K, 0),
144 LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM", 0xd9, 64, SZ_16K, NAND_ROM),
145 LEGACY_ID_NAND("SmartMedia 128MiB 3,3V", 0x79, 128, SZ_16K, 0),
146 LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM),
147 LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V", 0x71, 256, SZ_16K, 0),
148 LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM),
149 {NULL}
150};
151
152static struct nand_flash_dev nand_xd_flash_ids[] = {
153 LEGACY_ID_NAND("xD 16MiB 3,3V", 0x73, 16, SZ_16K, 0),
154 LEGACY_ID_NAND("xD 32MiB 3,3V", 0x75, 32, SZ_16K, 0),
155 LEGACY_ID_NAND("xD 64MiB 3,3V", 0x76, 64, SZ_16K, 0),
156 LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128, SZ_16K, 0),
157 LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256, SZ_16K, NAND_BROKEN_XD),
158 LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512, SZ_16K, NAND_BROKEN_XD),
159 LEGACY_ID_NAND("xD 1GiB 3,3V", 0xd3, 1024, SZ_16K, NAND_BROKEN_XD),
160 LEGACY_ID_NAND("xD 2GiB 3,3V", 0xd5, 2048, SZ_16K, NAND_BROKEN_XD),
161 {NULL}
162};
163
164int sm_register_device(struct mtd_info *mtd, int smartmedia)
165{
166 struct nand_chip *chip = mtd_to_nand(mtd);
167 int ret;
168
169 chip->options |= NAND_SKIP_BBTSCAN;
170
171 /* Scan for card properties */
172 ret = nand_scan_ident(mtd, 1, smartmedia ?
173 nand_smartmedia_flash_ids : nand_xd_flash_ids);
174
175 if (ret)
176 return ret;
177
178 /* Bad block marker position */
179 chip->badblockpos = 0x05;
180 chip->badblockbits = 7;
181 chip->block_markbad = sm_block_markbad;
182
183 /* ECC layout */
184 if (mtd->writesize == SM_SECTOR_SIZE)
185 mtd_set_ooblayout(mtd, &oob_sm_ops);
186 else if (mtd->writesize == SM_SMALL_PAGE)
187 mtd_set_ooblayout(mtd, &oob_sm_small_ops);
188 else
189 return -ENODEV;
190
191 ret = nand_scan_tail(mtd);
192
193 if (ret)
194 return ret;
195
196 return mtd_device_register(mtd, NULL, 0);
197}
198EXPORT_SYMBOL_GPL(sm_register_device);
199
200MODULE_LICENSE("GPL");
201MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
202MODULE_DESCRIPTION("Common SmartMedia/xD functions");