62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
|
/*
|
||
|
|
* Copyright © 2009 - Maxim Levitsky
|
||
|
|
* Common routines & support for SmartMedia/xD format
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
#include <linux/bitops.h>
|
||
|
|
#include <linux/mtd/mtd.h>
|
||
|
|
|
||
|
|
/* Full oob structure as written on the flash */
|
||
|
|
struct sm_oob {
|
||
|
|
uint32_t reserved;
|
||
|
|
uint8_t data_status;
|
||
|
|
uint8_t block_status;
|
||
|
|
uint8_t lba_copy1[2];
|
||
|
|
uint8_t ecc2[3];
|
||
|
|
uint8_t lba_copy2[2];
|
||
|
|
uint8_t ecc1[3];
|
||
|
|
} __packed;
|
||
|
|
|
||
|
|
|
||
|
|
/* one sector is always 512 bytes, but it can consist of two nand pages */
|
||
|
|
#define SM_SECTOR_SIZE 512
|
||
|
|
|
||
|
|
/* oob area is also 16 bytes, but might be from two pages */
|
||
|
|
#define SM_OOB_SIZE 16
|
||
|
|
|
||
|
|
/* This is maximum zone size, and all devices that have more that one zone
|
||
|
|
have this size */
|
||
|
|
#define SM_MAX_ZONE_SIZE 1024
|
||
|
|
|
||
|
|
/* support for small page nand */
|
||
|
|
#define SM_SMALL_PAGE 256
|
||
|
|
#define SM_SMALL_OOB_SIZE 8
|
||
|
|
|
||
|
|
|
||
|
|
extern int sm_register_device(struct mtd_info *mtd, int smartmedia);
|
||
|
|
|
||
|
|
|
||
|
|
static inline int sm_sector_valid(struct sm_oob *oob)
|
||
|
|
{
|
||
|
|
return hweight16(oob->data_status) >= 5;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int sm_block_valid(struct sm_oob *oob)
|
||
|
|
{
|
||
|
|
return hweight16(oob->block_status) >= 7;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int sm_block_erased(struct sm_oob *oob)
|
||
|
|
{
|
||
|
|
static const uint32_t erased_pattern[4] = {
|
||
|
|
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
|
||
|
|
|
||
|
|
/* First test for erased block */
|
||
|
|
if (!memcmp(oob, erased_pattern, sizeof(*oob)))
|
||
|
|
return 1;
|
||
|
|
return 0;
|
||
|
|
}
|