LXR linux/include/linux/platform

   1/*
   2 * BCH Error Location Module
   3 *
   4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 * GNU General Public License for more details.
  15 *
  16 */
  17
  18#ifndef __ELM_H
  19#define __ELM_H
  20
  21enum bch_ecc {
  22        BCH4_ECC = 0,
  23        BCH8_ECC,
  24};
  25
  26/* ELM support 8 error syndrome process */
  27#define ERROR_VECTOR_MAX                8
  28
  29#define BCH8_ECC_OOB_BYTES              13
  30#define BCH4_ECC_OOB_BYTES              7
  31/* RBL requires 14 byte even though BCH8 uses only 13 byte */
  32#define BCH8_SIZE                       (BCH8_ECC_OOB_BYTES + 1)
  33/* Uses 1 extra byte to handle erased pages */
  34#define BCH4_SIZE                       (BCH4_ECC_OOB_BYTES + 1)
  35
  36/**
  37 * struct elm_errorvec - error vector for elm
  38 * @error_reported:             set true for vectors error is reported
  39 * @error_uncorrectable:        number of uncorrectable errors
  40 * @error_count:                number of correctable errors in the sector
  41 * @error_loc:                  buffer for error location
  42 *
  43 */
  44struct elm_errorvec {
  45        bool error_reported;
  46        bool error_uncorrectable;
  47        int error_count;
  48        int error_loc[ERROR_VECTOR_MAX];
  49};
  50
  51void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
  52                struct elm_errorvec *err_vec);
  53int elm_config(struct device *dev, enum bch_ecc bch_type);
  54#endif /* __ELM_H */
  55