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mtd: devices: elm: check for hardware engine's design constraints

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ELM hardware engine is used by BCH ecc-schemes for detecting and locating ECC
errors. This patch adds the following checks for ELM hardware engine:

 - ELM internal buffers are of 1K,
   so it cannot process data with ecc-step-size > 1K.

 - ELM engine can execute upto maximum of 8 threads in parallel,
   so in *page-mode* (when complete page is processed in single iteration),
   ELM cannot support ecc-steps > 8.

Signed-off-by: Pekon Gupta <pekon@ti.com>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Pekon Gupta
2014-03-20 18:48:34 +05:30
committed by Brian Norris
parent d9ba46d32c
commit 3f4eb14bdb
3 changed files with 20 additions and 5 deletions
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3
include/linux/platform_data/elm.h
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@@ -50,5 +50,6 @@ struct elm_errorvec {
void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
struct elm_errorvec *err_vec);
int elm_config(struct device *dev, enum bch_ecc bch_type);
int elm_config(struct device *dev, enum bch_ecc bch_type,
int ecc_steps, int ecc_step_size, int ecc_syndrome_size);
#endif /* __ELM_H */