LXR linux/drivers/mtd/nand/raw/sm

   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 */
  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          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
  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