1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright © 2009 - Maxim Levitsky
 4 * Common routines & support for SmartMedia/xD format
 5 */
 6#include <linux/bitops.h>
 7#include <linux/mtd/mtd.h>
 8
 9/* Full oob structure as written on the flash */
10struct sm_oob {
11	uint32_t reserved;
12	uint8_t data_status;
13	uint8_t block_status;
14	uint8_t lba_copy1[2];
15	uint8_t ecc2[3];
16	uint8_t lba_copy2[2];
17	uint8_t ecc1[3];
18} __packed;
19
20
21/* one sector is always 512 bytes, but it can consist of two nand pages */
22#define SM_SECTOR_SIZE		512
23
24/* oob area is also 16 bytes, but might be from two pages */
25#define SM_OOB_SIZE		16
26
27/* This is maximum zone size, and all devices that have more that one zone
28   have this size */
29#define SM_MAX_ZONE_SIZE 	1024
30
31/* support for small page nand */
32#define SM_SMALL_PAGE 		256
33#define SM_SMALL_OOB_SIZE	8
34
35
36int sm_register_device(struct mtd_info *mtd, int smartmedia);
37
38
39static inline int sm_sector_valid(struct sm_oob *oob)
40{
41	return hweight16(oob->data_status) >= 5;
42}
43
44static inline int sm_block_valid(struct sm_oob *oob)
45{
46	return hweight16(oob->block_status) >= 7;
47}
48
49static inline int sm_block_erased(struct sm_oob *oob)
50{
51	static const uint32_t erased_pattern[4] = {
52		0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
53
54	/* First test for erased block */
55	if (!memcmp(oob, erased_pattern, sizeof(*oob)))
56		return 1;
57	return 0;
58}