c3611570dd
2GB xD card, and 4MB SmartMedia ROM card share same ID, so to make both work split xD and smartmedia ID tables. Hardware driver must be able to know which type it handles (and probably just one). Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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];
|
|
} __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, 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;
|
|
}
|