[PATCH 20/20] mtd: nand: Let software ECC engines be retrieved from the NAND core

[Miquel Raynal <miquel.raynal@bootlin.com>]

Before making use of the ECC engines, we must retrieve them. Add the
boilerplate for the ones already available: software engines (Hamming
and BCH).

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/mtd/nand/ecc.c   | 20 ++++++++++++++++++++
 include/linux/mtd/nand.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/mtd/nand/ecc.c b/drivers/mtd/nand/ecc.c
index 86bbc4ecc58a..a85269b03b2f 100644
--- a/drivers/mtd/nand/ecc.c
+++ b/drivers/mtd/nand/ecc.c
@@ -585,6 +585,26 @@ void nand_ecc_restore_req(struct nand_ecc_req_tweak_ctx *ctx,
 }
 EXPORT_SYMBOL_GPL(nand_ecc_restore_req);
 
+struct nand_ecc_engine *nand_ecc_get_sw_engine(struct nand_device *nand)
+{
+	unsigned int algo = nand->ecc.user_conf.algo;
+
+	if (algo == NAND_ECC_ALGO_UNKNOWN)
+		algo = nand->ecc.defaults.algo;
+
+	switch (algo) {
+	case NAND_ECC_ALGO_HAMMING:
+		return nand_ecc_sw_hamming_get_engine();
+	case NAND_ECC_ALGO_BCH:
+		return nand_ecc_sw_bch_get_engine();
+	default:
+		break;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(nand_ecc_get_sw_engine);
+
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com>");
 MODULE_DESCRIPTION("Generic ECC engine");
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 3616fa27eaa1..f78f61c9a9ee 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -277,6 +277,7 @@ int nand_ecc_prepare_io_req(struct nand_device *nand,
 int nand_ecc_finish_io_req(struct nand_device *nand,
 			   struct nand_page_io_req *req);
 bool nand_ecc_is_strong_enough(struct nand_device *nand);
+struct nand_ecc_engine *nand_ecc_get_sw_engine(struct nand_device *nand);
 
 #if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)
 struct nand_ecc_engine *nand_ecc_sw_hamming_get_engine(void);
-- 
2.20.1


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