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Linux/include/linux/platform_data/elm.h

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  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 */
 66 

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