1 files changed, 89 insertions, 0 deletions
diff --git a/include/linux/mtd/nand-ecc-sw-hamming.h b/include/linux/mtd/nand-ecc-sw-hamming.h
new file mode 100644
index 000000000000..c6c71894c575
--- /dev/null
+++ b/include/linux/mtd/nand-ecc-sw-hamming.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  Copyright (C) 2000-2010 Steven J. Hill <sjhill@realitydiluted.com>
+ *			    David Woodhouse <dwmw2@infradead.org>
+ *			    Thomas Gleixner <tglx@linutronix.de>
+ *
+ * This file is the header for the NAND Hamming ECC implementation.
+ */
+
+#ifndef __MTD_NAND_ECC_SW_HAMMING_H__
+#define __MTD_NAND_ECC_SW_HAMMING_H__
+
+#include <linux/mtd/nand.h>
+
+/**
+ * struct nand_ecc_sw_hamming_conf - private software Hamming ECC engine structure
+ * @req_ctx: Save request context and tweak the original request to fit the
+ *           engine needs
+ * @code_size: Number of bytes needed to store a code (one code per step)
+ * @calc_buf: Buffer to use when calculating ECC bytes
+ * @code_buf: Buffer to use when reading (raw) ECC bytes from the chip
+ * @sm_order: Smart Media special ordering
+ */
+struct nand_ecc_sw_hamming_conf {
+	struct nand_ecc_req_tweak_ctx req_ctx;
+	unsigned int code_size;
+	u8 *calc_buf;
+	u8 *code_buf;
+	unsigned int sm_order;
+};
+
+#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)
+
+int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand);
+void nand_ecc_sw_hamming_cleanup_ctx(struct nand_device *nand);
+int ecc_sw_hamming_calculate(const unsigned char *buf, unsigned int step_size,
+			     unsigned char *code, bool sm_order);
+int nand_ecc_sw_hamming_calculate(struct nand_device *nand,
+				  const unsigned char *buf,
+				  unsigned char *code);
+int ecc_sw_hamming_correct(unsigned char *buf, unsigned char *read_ecc,
+			   unsigned char *calc_ecc, unsigned int step_size,
+			   bool sm_order);
+int nand_ecc_sw_hamming_correct(struct nand_device *nand, unsigned char *buf,
+				unsigned char *read_ecc,
+				unsigned char *calc_ecc);
+
+#else /* !CONFIG_MTD_NAND_ECC_SW_HAMMING */
+
+static inline int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand)
+{
+	return -ENOTSUPP;
+}
+
+static inline void nand_ecc_sw_hamming_cleanup_ctx(struct nand_device *nand) {}
+
+static inline int ecc_sw_hamming_calculate(const unsigned char *buf,
+					   unsigned int step_size,
+					   unsigned char *code, bool sm_order)
+{
+	return -ENOTSUPP;
+}
+
+static inline int nand_ecc_sw_hamming_calculate(struct nand_device *nand,
+						const unsigned char *buf,
+						unsigned char *code)
+{
+	return -ENOTSUPP;
+}
+
+static inline int ecc_sw_hamming_correct(unsigned char *buf,
+					 unsigned char *read_ecc,
+					 unsigned char *calc_ecc,
+					 unsigned int step_size, bool sm_order)
+{
+	return -ENOTSUPP;
+}
+
+static inline int nand_ecc_sw_hamming_correct(struct nand_device *nand,
+					      unsigned char *buf,
+					      unsigned char *read_ecc,
+					      unsigned char *calc_ecc)
+{
+	return -ENOTSUPP;
+}
+
+#endif /* CONFIG_MTD_NAND_ECC_SW_HAMMING */
+
+#endif /* __MTD_NAND_ECC_SW_HAMMING_H__ */