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         BCH16_ECC,
  25 };
  26
  27 /* ELM support 8 error syndrome process */
  28 #define ERROR_VECTOR_MAX                8
  29
  30 /**
  31  * struct elm_errorvec - error vector for elm
  32  * @error_reported:             set true for vectors error is reported
  33  * @error_uncorrectable:        number of uncorrectable errors
  34  * @error_count:                number of correctable errors in the sector
  35  * @error_loc:                  buffer for error location
  36  *
  37  */
  38 struct elm_errorvec {
  39         bool error_reported;
  40         bool error_uncorrectable;
  41         int error_count;
  42         int error_loc[16];
  43 };
  44
  45 #if IS_ENABLED(CONFIG_MTD_NAND_OMAP_BCH)
  46 void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
  47                 struct elm_errorvec *err_vec);
  48 int elm_config(struct device *dev, enum bch_ecc bch_type,
  49         int ecc_steps, int ecc_step_size, int ecc_syndrome_size);
  50 #else
  51 static inline void
  52 elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
  53                           struct elm_errorvec *err_vec)
  54 {
  55 }
  56
  57 static inline int elm_config(struct device *dev, enum bch_ecc bch_type,
  58                              int ecc_steps, int ecc_step_size,
  59                              int ecc_syndrome_size)
  60 {
  61         return -ENOSYS;
  62 }
  63 #endif /* CONFIG_MTD_NAND_ECC_BCH */
  64
  65 #endif /* __ELM_H */