From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/mtd/nand/raw/sm_common.h | 58 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 drivers/mtd/nand/raw/sm_common.h (limited to 'drivers/mtd/nand/raw/sm_common.h') diff --git a/drivers/mtd/nand/raw/sm_common.h b/drivers/mtd/nand/raw/sm_common.h new file mode 100644 index 0000000000..57fc9f86f9 --- /dev/null +++ b/drivers/mtd/nand/raw/sm_common.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright © 2009 - Maxim Levitsky + * Common routines & support for SmartMedia/xD format + */ +#include +#include + +/* 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; +} -- cgit v1.2.3