blob: 00f4a83359b288f3f0c5c96036ef11c86c256afb [file] [log] [blame]
Maxim Levitsky9fc51a32010-02-22 20:39:39 +02001/*
2 * Copyright © 2009 - Maxim Levitsky
3 * Common routines & support for SmartMedia/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/bitops.h>
10#include <linux/mtd/mtd.h>
11
12/* Full oob structure as written on the flash */
13struct sm_oob {
14 uint32_t reserved;
15 uint8_t data_status;
16 uint8_t block_status;
17 uint8_t lba_copy1[2];
18 uint8_t ecc2[3];
19 uint8_t lba_copy2[2];
20 uint8_t ecc1[3];
21} __attribute__((packed));
22
23
24/* one sector is always 512 bytes, but it can consist of two nand pages */
25#define SM_SECTOR_SIZE 512
26
27/* oob area is also 16 bytes, but might be from two pages */
28#define SM_OOB_SIZE 16
29
30/* This is maximum zone size, and all devices that have more that one zone
31 have this size */
32#define SM_MAX_ZONE_SIZE 1024
33
34/* support for small page nand */
35#define SM_SMALL_PAGE 256
36#define SM_SMALL_OOB_SIZE 8
37
38
Maxim Levitskyc3611572010-04-19 18:20:41 +030039extern int sm_register_device(struct mtd_info *mtd, int smartmedia);
Maxim Levitsky9fc51a32010-02-22 20:39:39 +020040
41
Stephen Rothwell1f6ca0d2010-03-01 20:44:57 +110042static inline int sm_sector_valid(struct sm_oob *oob)
Maxim Levitsky9fc51a32010-02-22 20:39:39 +020043{
44 return hweight16(oob->data_status) >= 5;
45}
46
Stephen Rothwell1f6ca0d2010-03-01 20:44:57 +110047static inline int sm_block_valid(struct sm_oob *oob)
Maxim Levitsky9fc51a32010-02-22 20:39:39 +020048{
49 return hweight16(oob->block_status) >= 7;
50}
51
Stephen Rothwell1f6ca0d2010-03-01 20:44:57 +110052static inline int sm_block_erased(struct sm_oob *oob)
Maxim Levitsky9fc51a32010-02-22 20:39:39 +020053{
54 static const uint32_t erased_pattern[4] = {
55 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
56
57 /* First test for erased block */
58 if (!memcmp(oob, erased_pattern, sizeof(*oob)))
59 return 1;
60 return 0;
61}