[PATCH v3 28/40] 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.c                  | 20 ++++++++++++++++++++
 include/linux/mtd/nand-ecc-sw-bch.h     |  3 +++
 include/linux/mtd/nand-ecc-sw-hamming.h |  3 +++
 include/linux/mtd/nand.h                |  3 +++
 4 files changed, 29 insertions(+)

diff --git a/drivers/mtd/nand/ecc.c b/drivers/mtd/nand/ecc.c
index 8e7859355a10..da3aa2379b94 100644
--- a/drivers/mtd/nand/ecc.c
+++ b/drivers/mtd/nand/ecc.c
@@ -480,6 +480,26 @@ bool nand_ecc_correction_is_enough(struct nand_device *nand)
 }
 EXPORT_SYMBOL(nand_ecc_correction_is_enough);
 
+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_UNKNOWN)
+		algo = nand->ecc.defaults.algo;
+
+	switch (algo) {
+	case NAND_ECC_HAMMING:
+		return nand_ecc_sw_hamming_get_engine();
+	case NAND_ECC_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@xxxxxxxxxxx>");
 MODULE_DESCRIPTION("Generic ECC engine");
diff --git a/include/linux/mtd/nand-ecc-sw-bch.h b/include/linux/mtd/nand-ecc-sw-bch.h
index eec5373a2423..3c0cf42b7a1d 100644
--- a/include/linux/mtd/nand-ecc-sw-bch.h
+++ b/include/linux/mtd/nand-ecc-sw-bch.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 nand_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-ecc-sw-hamming.h b/include/linux/mtd/nand-ecc-sw-hamming.h
index 3ae51bd2e2ab..d79a72393ef4 100644
--- a/include/linux/mtd/nand-ecc-sw-hamming.h
+++ b/include/linux/mtd/nand-ecc-sw-hamming.h
@@ -12,6 +12,9 @@
 
 #include <linux/mtd/nand.h>
 
+/* Needed for cross inclusion with nand.h */
+struct nand_device;
+
 /**
  * struct nand_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 9d7b62933cc1..b410ef778e52 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-ecc-sw-hamming.h>
+#include <linux/mtd/nand-ecc-sw-bch.h>
 
 struct nand_device;
 
@@ -270,6 +272,7 @@ 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, void *oobbuf);
 bool nand_ecc_correction_is_enough(struct nand_device *nand);
+struct nand_ecc_engine *nand_ecc_get_sw_engine(struct nand_device *nand);
 
 /**
  * struct nand_ecc - High-level ECC object
-- 
2.20.1


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