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mtd: common module for smartmedia/xD support

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This small module implements few helpers that are usefull
for nand drivers for SmartMedia/xD card readers.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Maxim Levitsky
2010-02-22 20:39:39 +02:00
committed by David Woodhouse
parent e0b58d0a70
commit 9fc51a37a8
4 changed files with 178 additions and 0 deletions
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61
drivers/mtd/nand/sm_common.h Normal file
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/*
* 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];
} __attribute__((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);
inline int sm_sector_valid(struct sm_oob *oob)
{
return hweight16(oob->data_status) >= 5;
}
inline int sm_block_valid(struct sm_oob *oob)
{
return hweight16(oob->block_status) >= 7;
}
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;
}