mtd: nand: add new enum for storing ECC algorithm

Our nand_ecc_modes_t is already a bit abused by value NAND_ECC_SOFT_BCH.
This enum should store ECC mode only and putting algorithm details there
is a bad idea. It would result in too many values impossible to support
in a sane way.

To solve this problem let's add a new enum. We'll have to modify all
drivers to set it properly but once it's done it'll be possible to drop
NAND_ECC_SOFT_BCH. That will result in a cleaner design and more
possibilities like setting ECC algorithm for hardware ECC mode.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 56574ba36555..1b673e19667c 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -119,6 +119,12 @@ typedef enum {
         NAND_ECC_SOFT_BCH,
 } nand_ecc_modes_t;
 
+enum nand_ecc_algo {
+        NAND_ECC_UNKNOWN,
+        NAND_ECC_HAMMING,
+        NAND_ECC_BCH,
+};
+
 /*
  * Constants for Hardware ECC
  */
@@ -458,6 +464,7 @@ struct nand_hw_control {
 /**
  * struct nand_ecc_ctrl - Control structure for ECC
  * @mode:       ECC mode
+ * @algo:       ECC algorithm
  * @steps:      number of ECC steps per page
  * @size:       data bytes per ECC step
  * @bytes:      ECC bytes per step
@@ -508,6 +515,7 @@ struct nand_hw_control {
  */
 struct nand_ecc_ctrl {
         nand_ecc_modes_t mode;
+        enum nand_ecc_algo algo;
         int steps;
         int size;
         int bytes;