1 /* 2 * Copyright © 2009 - Maxim Levitsky 3 * Common routines & support for SmartMedia/xD format 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 #include <linux/bitops.h> 10 #include <linux/mtd/mtd.h> 11 12 /* Full oob structure as written on the flash */ 13 struct sm_oob { 14 uint32_t reserved; 15 uint8_t data_status; 16 uint8_t block_status; 17 uint8_t lba_copy1[2]; 18 uint8_t ecc2[3]; 19 uint8_t lba_copy2[2]; 20 uint8_t ecc1[3]; 21 } __packed; 22 23 24 /* one sector is always 512 bytes, but it can consist of two nand pages */ 25 #define SM_SECTOR_SIZE 512 26 27 /* oob area is also 16 bytes, but might be from two pages */ 28 #define SM_OOB_SIZE 16 29 30 /* This is maximum zone size, and all devices that have more that one zone 31 have this size */ 32 #define SM_MAX_ZONE_SIZE 1024 33 34 /* support for small page nand */ 35 #define SM_SMALL_PAGE 256 36 #define SM_SMALL_OOB_SIZE 8 37 38 39 int sm_register_device(struct mtd_info *mtd, int smartmedia); 40 41 42 static inline int sm_sector_valid(struct sm_oob *oob) 43 { 44 return hweight16(oob->data_status) >= 5; 45 } 46 47 static inline int sm_block_valid(struct sm_oob *oob) 48 { 49 return hweight16(oob->block_status) >= 7; 50 } 51 52 static inline int sm_block_erased(struct sm_oob *oob) 53 { 54 static const uint32_t erased_pattern[4] = { 55 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; 56 57 /* First test for erased block */ 58 if (!memcmp(oob, erased_pattern, sizeof(*oob))) 59 return 1; 60 return 0; 61 } 62