[RFC PATCH 20/27] mtd: nand: Let software ECC engines be retrieved from the NAND core

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

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@xxxxxxxxxxx>
---
 drivers/mtd/nand/ecc/engine.c              | 14 ++++++++++++++
 include/linux/mtd/nand-sw-bch-engine.h     |  3 +++
 include/linux/mtd/nand-sw-hamming-engine.h |  3 +++
 include/linux/mtd/nand.h                   |  3 +++
 4 files changed, 23 insertions(+)

diff --git a/drivers/mtd/nand/ecc/engine.c b/drivers/mtd/nand/ecc/engine.c
index 7dd3f9772698..318dbb2d56a2 100644
--- a/drivers/mtd/nand/ecc/engine.c
+++ b/drivers/mtd/nand/ecc/engine.c
@@ -286,6 +286,20 @@ bool nand_ecc_correction_is_enough(struct nand_device *nand)
 	return corr >= ds_corr && conf->strength >= reqs->strength;
 }
 
+struct nand_ecc_engine *nand_ecc_sw_get_engine(struct nand_device *nand)
+{
+	switch (nand->ecc.user_conf.algo) {
+	case NAND_ECC_HAMMING:
+		return ecc_sw_hamming_get_engine();
+	case NAND_ECC_BCH:
+		return ecc_sw_bch_get_engine();
+	default:
+		break;
+	}
+
+	return NULL;
+}
+
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Miquel Raynal <miquel.raynal@xxxxxxxxxxx>");
 MODULE_DESCRIPTION("Generic ECC engine");
diff --git a/include/linux/mtd/nand-sw-bch-engine.h b/include/linux/mtd/nand-sw-bch-engine.h
index e406aa53ec4e..38cdad117fea 100644
--- a/include/linux/mtd/nand-sw-bch-engine.h
+++ b/include/linux/mtd/nand-sw-bch-engine.h
@@ -11,6 +11,9 @@
 #include <linux/mtd/nand.h>
 #include <linux/bch.h>
 
+/* Needed for cross inclusion with nand.h */
+struct nand_device;
+
 /**
  * struct ecc_sw_bch_conf - private software BCH ECC engine structure
  * @reqooblen: Save the actual user OOB length requested before overwriting it
diff --git a/include/linux/mtd/nand-sw-hamming-engine.h b/include/linux/mtd/nand-sw-hamming-engine.h
index 8df36d189482..51c5a2acee42 100644
--- a/include/linux/mtd/nand-sw-hamming-engine.h
+++ b/include/linux/mtd/nand-sw-hamming-engine.h
@@ -12,6 +12,9 @@
 
 #include <linux/mtd/nand.h>
 
+/* Needed for cross inclusion with nand.h */
+struct nand_device;
+
 /**
  * struct ecc_sw_hamming_conf - private software Hamming ECC engine structure
  * @reqooblen: Save the actual user OOB length requested before overwriting it
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 4482eb2bbfd4..3abe113e4f06 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -11,6 +11,8 @@
 #define __LINUX_MTD_NAND_H
 
 #include <linux/mtd/mtd.h>
+#include <linux/mtd/nand-sw-hamming-engine.h>
+#include <linux/mtd/nand-sw-bch-engine.h>
 
 struct nand_device;
 
@@ -253,6 +255,7 @@ struct nand_ecc_engine {
 };
 
 void nand_ecc_read_user_conf(struct nand_device *nand);
+struct nand_ecc_engine *nand_ecc_sw_get_engine(struct nand_device *nand);
 int nand_ecc_init_ctx(struct nand_device *nand);
 void nand_ecc_cleanup_ctx(struct nand_device *nand);
 int nand_ecc_prepare_io_req(struct nand_device *nand,
-- 
2.19.1


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