| /* | |
| * 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; | |
| } |