include/linux/platform_data/elm.h

   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
  21 enum 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  */
  44 struct elm_errorvec {
  45         bool error_reported;
  46         bool error_uncorrectable;
  47         int error_count;
  48         int error_loc[ERROR_VECTOR_MAX];
  49 };
  50
  51 void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
  52                 struct elm_errorvec *err_vec);
  53 int elm_config(struct device *dev, enum bch_ecc bch_type);
  54 #endif /* __ELM_H */