[RFC PATCH 23/27] mtd: spinand: Move the ECC helper functions into a separate file

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

Prepare the creation of a SPI-NAND chips on-die ECC engine by moving
some code out of the core. The next step is to actually create that
engine by implementing the generic ECC interface.

Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/mtd/nand/spi/Makefile            |  2 +-
 drivers/mtd/nand/spi/core.c              | 36 ------------------
 drivers/mtd/nand/spi/on-die-ecc-engine.c | 47 ++++++++++++++++++++++++
 include/linux/mtd/spinand.h              |  2 +
 4 files changed, 50 insertions(+), 37 deletions(-)
 create mode 100644 drivers/mtd/nand/spi/on-die-ecc-engine.c

diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
index 753125082640..e8a04669bdb6 100644
--- a/drivers/mtd/nand/spi/Makefile
+++ b/drivers/mtd/nand/spi/Makefile
@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
-spinand-objs := core.o gigadevice.o macronix.o micron.o toshiba.o winbond.o
+spinand-objs := core.o on-die-ecc-engine.o gigadevice.o macronix.o micron.o toshiba.o winbond.o
 obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 9c8a5ee626cd..eb0b4ffdd8ed 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -200,13 +200,6 @@ static int spinand_init_quad_enable(struct spinand_device *spinand)
 			       enable ? CFG_QUAD_ENABLE : 0);
 }
 
-static int spinand_ecc_enable(struct spinand_device *spinand,
-			      bool enable)
-{
-	return spinand_upd_cfg(spinand, CFG_ECC_ENABLE,
-			       enable ? CFG_ECC_ENABLE : 0);
-}
-
 static int spinand_write_enable_op(struct spinand_device *spinand)
 {
 	struct spi_mem_op op = SPINAND_WR_EN_DIS_OP(true);
@@ -463,35 +456,6 @@ static int spinand_lock_block(struct spinand_device *spinand, u8 lock)
 	return spinand_write_reg_op(spinand, REG_BLOCK_LOCK, lock);
 }
 
-static int spinand_check_ecc_status(struct spinand_device *spinand, u8 status)
-{
-	struct nand_device *nand = spinand_to_nand(spinand);
-
-	if (spinand->eccinfo.get_status)
-		return spinand->eccinfo.get_status(spinand, status);
-
-	switch (status & STATUS_ECC_MASK) {
-	case STATUS_ECC_NO_BITFLIPS:
-		return 0;
-
-	case STATUS_ECC_HAS_BITFLIPS:
-		/*
-		 * We have no way to know exactly how many bitflips have been
-		 * fixed, so let's return the maximum possible value so that
-		 * wear-leveling layers move the data immediately.
-		 */
-		return nand->ecc.ctx.conf.strength;
-
-	case STATUS_ECC_UNCOR_ERROR:
-		return -EBADMSG;
-
-	default:
-		break;
-	}
-
-	return -EINVAL;
-}
-
 static int spinand_read_page(struct spinand_device *spinand,
 			     const struct nand_page_io_req *req,
 			     bool ecc_enabled)
diff --git a/drivers/mtd/nand/spi/on-die-ecc-engine.c b/drivers/mtd/nand/spi/on-die-ecc-engine.c
new file mode 100644
index 000000000000..3d5b83238e14
--- /dev/null
+++ b/drivers/mtd/nand/spi/on-die-ecc-engine.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * On-die Error-Correcting Code (ECC) engine for SPI-NAND devices
+ *
+ * Copyright (C) 2019 Macronix
+ * Author:
+ *     Miquèl RAYNAL <miquel.raynal@xxxxxxxxxxx>
+ * Taken from the SPI-NAND core code written by:
+ *     Boris BREZILLON <bbrezillon@xxxxxxxxxx>
+ */
+
+#include <linux/mtd/spinand.h>
+
+int spinand_ecc_enable(struct spinand_device *spinand, bool enable)
+{
+	return spinand_upd_cfg(spinand, CFG_ECC_ENABLE,
+			       enable ? CFG_ECC_ENABLE : 0);
+}
+
+int spinand_check_ecc_status(struct spinand_device *spinand, u8 status)
+{
+	struct nand_device *nand = spinand_to_nand(spinand);
+
+	if (spinand->eccinfo.get_status)
+		return spinand->eccinfo.get_status(spinand, status);
+
+	switch (status & STATUS_ECC_MASK) {
+	case STATUS_ECC_NO_BITFLIPS:
+		return 0;
+
+	case STATUS_ECC_HAS_BITFLIPS:
+		/*
+		 * We have no way to know exactly how many bitflips have been
+		 * fixed, so let's return the maximum possible value so that
+		 * wear-leveling layers move the data immediately.
+		 */
+		return nand->ecc.ctx.conf.strength;
+
+	case STATUS_ECC_UNCOR_ERROR:
+		return -EBADMSG;
+
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 75a28dc79a9c..77d9caff4a5c 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -419,5 +419,7 @@ int spinand_match_and_init(struct spinand_device *dev,
 
 int spinand_upd_cfg(struct spinand_device *spinand, u8 mask, u8 val);
 int spinand_select_target(struct spinand_device *spinand, unsigned int target);
+int spinand_ecc_enable(struct spinand_device *spinand, bool enable);
+int spinand_check_ecc_status(struct spinand_device *spinand, u8 status);
 
 #endif /* __LINUX_MTD_SPINAND_H */
-- 
2.19.1


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