1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright © 2009 - Maxim Levitsky 4 * Common routines & support for SmartMedia/xD format 5 */ 6 #include <linux/bitops.h> 7 #include <linux/mtd/mtd.h> 8 9 /* Full oob structure as written on the flash */ 10 struct 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 512 23 24 /* oob area is also 16 bytes, but might be from two pages */ 25 #define SM_OOB_SIZE 16 26 27 /* This is maximum zone size, and all devices that have more that one zone 28 have this size */ 29 #define SM_MAX_ZONE_SIZE 1024 30 31 /* support for small page nand */ 32 #define SM_SMALL_PAGE 256 33 #define SM_SMALL_OOB_SIZE 8 34 35 36 int sm_register_device(struct mtd_info *mtd, int smartmedia); 37 38 sm_sector_valid(struct sm_oob * oob)39 static inline int sm_sector_valid(struct sm_oob *oob) 40 { 41 return hweight16(oob->data_status) >= 5; 42 } 43 sm_block_valid(struct sm_oob * oob)44 static inline int sm_block_valid(struct sm_oob *oob) 45 { 46 return hweight16(oob->block_status) >= 7; 47 } 48 sm_block_erased(struct sm_oob * oob)49 static 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