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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright © 2009 - Maxim Levitsky4 * Common routines & support for SmartMedia/xD format5 */6#include <linux/bitops.h>7#include <linux/mtd/mtd.h>8 9/* Full oob structure as written on the flash */10struct sm_oob {11 uint32_t reserved;12 uint8_t data_status;13 uint8_t block_status;14 uint8_t lba_copy1[2];15 uint8_t ecc2[3];16 uint8_t lba_copy2[2];17 uint8_t ecc1[3];18} __packed;19 20 21/* one sector is always 512 bytes, but it can consist of two nand pages */22#define SM_SECTOR_SIZE 51223 24/* oob area is also 16 bytes, but might be from two pages */25#define SM_OOB_SIZE 1626 27/* This is maximum zone size, and all devices that have more that one zone28 have this size */29#define SM_MAX_ZONE_SIZE 102430 31/* support for small page nand */32#define SM_SMALL_PAGE 25633#define SM_SMALL_OOB_SIZE 834 35 36int sm_register_device(struct mtd_info *mtd, int smartmedia);37 38 39static inline int sm_sector_valid(struct sm_oob *oob)40{41 return hweight16(oob->data_status) >= 5;42}43 44static inline int sm_block_valid(struct sm_oob *oob)45{46 return hweight16(oob->block_status) >= 7;47}48 49static inline int sm_block_erased(struct sm_oob *oob)50{51 static const uint32_t erased_pattern[4] = {52 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };53 54 /* First test for erased block */55 if (!memcmp(oob, erased_pattern, sizeof(*oob)))56 return 1;57 return 0;58}59