/* * 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 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; }