[PATCH 1/4] mtd: rawnand: Turn the ONFI support to generic

["Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@xxxxxxxxxx>]

Fix headers to make way for adding helper functions.

Add onfi helper structure.

Add helper functions in raw NAND core, which later will be used during
ONFI detection.

Signed-off-by: Shivamurthy Shastri <sshivamurthy@xxxxxxxxxx>
---
 drivers/mtd/nand/raw/internals.h |   6 +-
 drivers/mtd/nand/raw/nand_base.c | 236 ++++++++++++++++++++++++++++---
 drivers/mtd/nand/raw/nand_onfi.c | 215 +++++-----------------------
 include/linux/mtd/nand.h         |  30 ++++
 include/linux/mtd/rawnand.h      |   5 +
 5 files changed, 289 insertions(+), 203 deletions(-)

diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h
index a204f9d7e123..eb34dece4754 100644
--- a/drivers/mtd/nand/raw/internals.h
+++ b/drivers/mtd/nand/raw/internals.h
@@ -90,7 +90,7 @@ int nand_write_page_raw_notsupp(struct nand_chip *chip, const u8 *buf,
 				int oob_required, int page);
 int nand_exit_status_op(struct nand_chip *chip);
 int nand_read_param_page_op(struct nand_chip *chip, u8 page, void *buf,
-			    unsigned int len);
+		unsigned int len);
 void nand_decode_ext_id(struct nand_chip *chip);
 void panic_nand_wait(struct nand_chip *chip, unsigned long timeo);
 void sanitize_string(uint8_t *s, size_t len);
@@ -138,10 +138,6 @@ void nand_legacy_set_defaults(struct nand_chip *chip);
 void nand_legacy_adjust_cmdfunc(struct nand_chip *chip);
 int nand_legacy_check_hooks(struct nand_chip *chip);
 
-/* ONFI functions */
-u16 onfi_crc16(u16 crc, u8 const *p, size_t len);
-int nand_onfi_detect(struct nand_chip *chip);
-
 /* JEDEC functions */
 int nand_jedec_detect(struct nand_chip *chip);
 
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 0bc898bdb6e1..fc2c7d6ea4f2 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4194,24 +4194,6 @@ static void nand_set_defaults(struct nand_chip *chip)
 		chip->buf_align = 1;
 }
 
-/* Sanitize ONFI strings so we can safely print them */
-void sanitize_string(uint8_t *s, size_t len)
-{
-	ssize_t i;
-
-	/* Null terminate */
-	s[len - 1] = 0;
-
-	/* Remove non printable chars */
-	for (i = 0; i < len - 1; i++) {
-		if (s[i] < ' ' || s[i] > 127)
-			s[i] = '?';
-	}
-
-	/* Remove trailing spaces */
-	strim(s);
-}
-
 /*
  * nand_id_has_period - Check if an ID string has a given wraparound period
  * @id_data: the ID string
@@ -4461,6 +4443,222 @@ nand_manufacturer_name(const struct nand_manufacturer *manufacturer)
 	return manufacturer ? manufacturer->name : "Unknown";
 }
 
+/* Parse the ONFI parameter Page */
+int nand_onfi_read_op(struct nand_device *base, u8 page, void *buf,
+		      unsigned int len)
+{
+	struct nand_chip *chip = device_to_nand(base);
+	struct nand_onfi_params *p = buf;
+	int ret;
+	unsigned int i;
+
+	ret = nand_read_param_page_op(chip, 0, NULL, 0);
+	if (ret)
+		return 0;
+
+	for (i = 0; i < 3; i++) {
+		ret = nand_read_data_op(chip, &p[i], sizeof(*p), true);
+		if (ret)
+			return 0;
+	}
+
+	return 1;
+}
+
+/* Parse the Extended Parameter Page. */
+static int nand_ext_param_page(struct nand_chip *chip,
+			       struct nand_onfi_params *p)
+{
+	struct onfi_ext_param_page *ep;
+	struct onfi_ext_section *s;
+	struct onfi_ext_ecc_info *ecc;
+	u8 *cursor;
+	int ret;
+	int len;
+	int i;
+
+	/*
+	 * The nand_flash_detect_ext_param_page() uses the
+	 * Change Read Column command which maybe not supported
+	 * by the chip->legacy.cmdfunc. So try to update the
+	 * chip->legacy.cmdfunc now. We do not replace user supplied
+	 * command function.
+	 */
+	nand_legacy_adjust_cmdfunc(chip);
+
+	len = le16_to_cpu(p->ext_param_page_length) * 16;
+	ep = kmalloc(len, GFP_KERNEL);
+	if (!ep)
+		return -ENOMEM;
+
+	/* Send our own NAND_CMD_PARAM. */
+	ret = nand_read_param_page_op(chip, 0, NULL, 0);
+	if (ret)
+		goto ext_out;
+
+	/* Use the Change Read Column command to skip the ONFI param pages. */
+	ret = nand_change_read_column_op(chip,
+					 sizeof(*p) * p->num_of_param_pages,
+					 ep, len, true);
+	if (ret)
+		goto ext_out;
+
+	ret = -EINVAL;
+	if ((onfi_crc16(ONFI_CRC_BASE, ((uint8_t *)ep) + 2, len - 2)
+		!= le16_to_cpu(ep->crc))) {
+		pr_debug("fail in the CRC.\n");
+		goto ext_out;
+	}
+
+	/*
+	 * Check the signature.
+	 * Do not strictly follow the ONFI spec, maybe changed in future.
+	 */
+	if (strncmp(ep->sig, "EPPS", 4)) {
+		pr_debug("The signature is invalid.\n");
+		goto ext_out;
+	}
+
+	/* find the ECC section. */
+	cursor = (uint8_t *)(ep + 1);
+	for (i = 0; i < ONFI_EXT_SECTION_MAX; i++) {
+		s = ep->sections + i;
+		if (s->type == ONFI_SECTION_TYPE_2)
+			break;
+		cursor += s->length * 16;
+	}
+	if (i == ONFI_EXT_SECTION_MAX) {
+		pr_debug("We can not find the ECC section.\n");
+		goto ext_out;
+	}
+
+	/* get the info we want. */
+	ecc = (struct onfi_ext_ecc_info *)cursor;
+
+	if (!ecc->codeword_size) {
+		pr_debug("Invalid codeword size\n");
+		goto ext_out;
+	}
+
+	chip->base.ecc.requirements.strength = ecc->ecc_bits;
+	chip->base.ecc.requirements.step_size = 1 << ecc->codeword_size;
+	ret = 0;
+
+ext_out:
+	kfree(ep);
+	return ret;
+}
+
+static int check_onfi_version(struct nand_device *base,
+			      struct nand_onfi_params *p, int *onfi_version)
+{
+	struct nand_chip *chip = device_to_nand(base);
+	int val;
+
+	if (chip->manufacturer.desc && chip->manufacturer.desc->ops &&
+	    chip->manufacturer.desc->ops->fixup_onfi_param_page)
+		chip->manufacturer.desc->ops->fixup_onfi_param_page(chip, p);
+
+	/* Check version */
+	val = le16_to_cpu(p->revision);
+	if (val & ONFI_VERSION_2_3)
+		*onfi_version = 23;
+	else if (val & ONFI_VERSION_2_2)
+		*onfi_version = 22;
+	else if (val & ONFI_VERSION_2_1)
+		*onfi_version = 21;
+	else if (val & ONFI_VERSION_2_0)
+		*onfi_version = 20;
+	else if (val & ONFI_VERSION_1_0)
+		*onfi_version = 10;
+
+	if (!(*onfi_version)) {
+		pr_info("unsupported ONFI version: %d\n", val);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int nand_intf_data(struct nand_device *base, struct nand_onfi_params *p)
+{
+	struct nand_chip *chip = device_to_nand(base);
+	struct onfi_params *onfi;
+	int onfi_version;
+	int ret;
+
+	check_onfi_version(base, p, &onfi_version);
+
+	/* The Extended Parameter Page is supported since ONFI 2.1. */
+	if (onfi_version >= 21 &&
+	    (le16_to_cpu(p->features) &
+			 ONFI_FEATURE_EXT_PARAM_PAGE)) {
+		if (nand_ext_param_page(chip, p))
+			pr_warn("Failed to detect ONFI extended param page\n");
+	}
+
+	chip->parameters.model = kstrdup(p->model, GFP_KERNEL);
+	if (!chip->parameters.model)
+		return -ENOMEM;
+
+	if (le16_to_cpu(p->features) & ONFI_FEATURE_16_BIT_BUS)
+		chip->options |= NAND_BUSWIDTH_16;
+
+	/* Save some parameters from the parameter page for future use */
+	if (le16_to_cpu(p->opt_cmd) & ONFI_OPT_CMD_SET_GET_FEATURES) {
+		chip->parameters.supports_set_get_features = true;
+		bitmap_set(chip->parameters.get_feature_list,
+			   ONFI_FEATURE_ADDR_TIMING_MODE, 1);
+		bitmap_set(chip->parameters.set_feature_list,
+			   ONFI_FEATURE_ADDR_TIMING_MODE, 1);
+	}
+
+	onfi = kzalloc(sizeof(*onfi), GFP_KERNEL);
+	if (!onfi) {
+		return ret = -ENOMEM;
+		goto free_model;
+	}
+
+	check_onfi_version(base, p, &onfi_version);
+	onfi->version = onfi_version;
+	onfi->tPROG = le16_to_cpu(p->t_prog);
+	onfi->tBERS = le16_to_cpu(p->t_bers);
+	onfi->tR = le16_to_cpu(p->t_r);
+	onfi->tCCS = le16_to_cpu(p->t_ccs);
+	onfi->async_timing_mode = le16_to_cpu(p->async_timing_mode);
+	onfi->vendor_revision = le16_to_cpu(p->vendor_revision);
+	memcpy(onfi->vendor, p->vendor, sizeof(p->vendor));
+	chip->parameters.onfi = onfi;
+
+	return 1;
+
+free_model:
+	kfree(chip->parameters.model);
+
+	return ret;
+}
+
+/*
+ * Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
+ */
+int rawnand_onfi_detect(struct nand_chip *chip)
+{
+	char id[4];
+	int ret;
+
+	/* Try ONFI for unknown chip or LP */
+	ret = nand_readid_op(chip, 0x20, id, sizeof(id));
+	if (ret || strncmp(id, "ONFI", 4))
+		return 0;
+
+	chip->base.helper.page = 0;
+	chip->base.helper.check_revision = check_onfi_version;
+	chip->base.helper.parameter_page_read = nand_onfi_read_op;
+	chip->base.helper.init_intf_data = nand_intf_data;
+
+	return nand_onfi_detect(&chip->base);
+}
+
 /*
  * Get the flash and manufacturer id and lookup if the type is supported.
  */
@@ -4556,7 +4754,7 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
 
 	if (!type->name || !type->pagesize) {
 		/* Check if the chip is ONFI compliant */
-		ret = nand_onfi_detect(chip);
+		ret = rawnand_onfi_detect(chip);
 		if (ret < 0)
 			return ret;
 		else if (ret)
diff --git a/drivers/mtd/nand/raw/nand_onfi.c b/drivers/mtd/nand/raw/nand_onfi.c
index 9d21b47ebef1..61fcb6994b45 100644
--- a/drivers/mtd/nand/raw/nand_onfi.c
+++ b/drivers/mtd/nand/raw/nand_onfi.c
@@ -13,8 +13,7 @@
  */
 
 #include <linux/slab.h>
-
-#include "internals.h"
+#include <linux/mtd/nand.h>
 
 u16 onfi_crc16(u16 crc, u8 const *p, size_t len)
 {
@@ -28,88 +27,13 @@ u16 onfi_crc16(u16 crc, u8 const *p, size_t len)
 	return crc;
 }
 
-/* Parse the Extended Parameter Page. */
-static int nand_flash_detect_ext_param_page(struct nand_chip *chip,
-					    struct nand_onfi_params *p)
-{
-	struct onfi_ext_param_page *ep;
-	struct onfi_ext_section *s;
-	struct onfi_ext_ecc_info *ecc;
-	uint8_t *cursor;
-	int ret;
-	int len;
-	int i;
-
-	len = le16_to_cpu(p->ext_param_page_length) * 16;
-	ep = kmalloc(len, GFP_KERNEL);
-	if (!ep)
-		return -ENOMEM;
-
-	/* Send our own NAND_CMD_PARAM. */
-	ret = nand_read_param_page_op(chip, 0, NULL, 0);
-	if (ret)
-		goto ext_out;
-
-	/* Use the Change Read Column command to skip the ONFI param pages. */
-	ret = nand_change_read_column_op(chip,
-					 sizeof(*p) * p->num_of_param_pages,
-					 ep, len, true);
-	if (ret)
-		goto ext_out;
-
-	ret = -EINVAL;
-	if ((onfi_crc16(ONFI_CRC_BASE, ((uint8_t *)ep) + 2, len - 2)
-		!= le16_to_cpu(ep->crc))) {
-		pr_debug("fail in the CRC.\n");
-		goto ext_out;
-	}
-
-	/*
-	 * Check the signature.
-	 * Do not strictly follow the ONFI spec, maybe changed in future.
-	 */
-	if (strncmp(ep->sig, "EPPS", 4)) {
-		pr_debug("The signature is invalid.\n");
-		goto ext_out;
-	}
-
-	/* find the ECC section. */
-	cursor = (uint8_t *)(ep + 1);
-	for (i = 0; i < ONFI_EXT_SECTION_MAX; i++) {
-		s = ep->sections + i;
-		if (s->type == ONFI_SECTION_TYPE_2)
-			break;
-		cursor += s->length * 16;
-	}
-	if (i == ONFI_EXT_SECTION_MAX) {
-		pr_debug("We can not find the ECC section.\n");
-		goto ext_out;
-	}
-
-	/* get the info we want. */
-	ecc = (struct onfi_ext_ecc_info *)cursor;
-
-	if (!ecc->codeword_size) {
-		pr_debug("Invalid codeword size\n");
-		goto ext_out;
-	}
-
-	chip->base.ecc.requirements.strength = ecc->ecc_bits;
-	chip->base.ecc.requirements.step_size = 1 << ecc->codeword_size;
-	ret = 0;
-
-ext_out:
-	kfree(ep);
-	return ret;
-}
-
 /*
  * Recover data with bit-wise majority
  */
-static void nand_bit_wise_majority(const void **srcbufs,
-				   unsigned int nsrcbufs,
-				   void *dstbuf,
-				   unsigned int bufsize)
+void nand_bit_wise_majority(const void **srcbufs,
+			    unsigned int nsrcbufs,
+			    void *dstbuf,
+			    unsigned int bufsize)
 {
 	int i, j, k;
 
@@ -134,44 +58,49 @@ static void nand_bit_wise_majority(const void **srcbufs,
 	}
 }
 
+/* Sanitize ONFI strings so we can safely print them */
+void sanitize_string(u8 *s, size_t len)
+{
+	ssize_t i;
+
+	/* Null terminate */
+	s[len - 1] = 0;
+
+	/* Remove non printable chars */
+	for (i = 0; i < len - 1; i++) {
+		if (s[i] < ' ' || s[i] > 127)
+			s[i] = '?';
+	}
+
+	/* Remove trailing spaces */
+	strim(s);
+}
+
 /*
  * Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
  */
-int nand_onfi_detect(struct nand_chip *chip)
+int nand_onfi_detect(struct nand_device *base)
 {
-	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct mtd_info *mtd = &base->mtd;
 	struct nand_memory_organization *memorg;
 	struct nand_onfi_params *p;
-	struct onfi_params *onfi;
 	int onfi_version = 0;
-	char id[4];
-	int i, ret, val;
-
-	memorg = nanddev_get_memorg(&chip->base);
+	int i, ret;
 
-	/* Try ONFI for unknown chip or LP */
-	ret = nand_readid_op(chip, 0x20, id, sizeof(id));
-	if (ret || strncmp(id, "ONFI", 4))
-		return 0;
+	memorg = nanddev_get_memorg(base);
 
 	/* ONFI chip: allocate a buffer to hold its parameter page */
-	p = kzalloc((sizeof(*p) * 3), GFP_KERNEL);
+	p = kzalloc(sizeof(*p) * 3, GFP_KERNEL);
 	if (!p)
 		return -ENOMEM;
 
-	ret = nand_read_param_page_op(chip, 0, NULL, 0);
-	if (ret) {
-		ret = 0;
+	ret = base->helper.parameter_page_read(base, base->helper.page,
+						p, sizeof(*p) * 3);
+	if (!ret) {
 		goto free_onfi_param_page;
 	}
 
 	for (i = 0; i < 3; i++) {
-		ret = nand_read_data_op(chip, &p[i], sizeof(*p), true);
-		if (ret) {
-			ret = 0;
-			goto free_onfi_param_page;
-		}
-
 		if (onfi_crc16(ONFI_CRC_BASE, (u8 *)&p[i], 254) ==
 				le16_to_cpu(p->crc)) {
 			if (i)
@@ -194,35 +123,12 @@ int nand_onfi_detect(struct nand_chip *chip)
 		}
 	}
 
-	if (chip->manufacturer.desc && chip->manufacturer.desc->ops &&
-	    chip->manufacturer.desc->ops->fixup_onfi_param_page)
-		chip->manufacturer.desc->ops->fixup_onfi_param_page(chip, p);
-
-	/* Check version */
-	val = le16_to_cpu(p->revision);
-	if (val & ONFI_VERSION_2_3)
-		onfi_version = 23;
-	else if (val & ONFI_VERSION_2_2)
-		onfi_version = 22;
-	else if (val & ONFI_VERSION_2_1)
-		onfi_version = 21;
-	else if (val & ONFI_VERSION_2_0)
-		onfi_version = 20;
-	else if (val & ONFI_VERSION_1_0)
-		onfi_version = 10;
-
-	if (!onfi_version) {
-		pr_info("unsupported ONFI version: %d\n", val);
+	ret = base->helper.check_revision(base, p, &onfi_version);
+	if (!ret)
 		goto free_onfi_param_page;
-	}
 
 	sanitize_string(p->manufacturer, sizeof(p->manufacturer));
 	sanitize_string(p->model, sizeof(p->model));
-	chip->parameters.model = kstrdup(p->model, GFP_KERNEL);
-	if (!chip->parameters.model) {
-		ret = -ENOMEM;
-		goto free_onfi_param_page;
-	}
 
 	memorg->pagesize = le32_to_cpu(p->byte_per_page);
 	mtd->writesize = memorg->pagesize;
@@ -248,63 +154,14 @@ int nand_onfi_detect(struct nand_chip *chip)
 	memorg->max_bad_eraseblocks_per_lun = le32_to_cpu(p->blocks_per_lun);
 	memorg->bits_per_cell = p->bits_per_cell;
 
-	if (le16_to_cpu(p->features) & ONFI_FEATURE_16_BIT_BUS)
-		chip->options |= NAND_BUSWIDTH_16;
-
 	if (p->ecc_bits != 0xff) {
-		chip->base.ecc.requirements.strength = p->ecc_bits;
-		chip->base.ecc.requirements.step_size = 512;
-	} else if (onfi_version >= 21 &&
-		(le16_to_cpu(p->features) & ONFI_FEATURE_EXT_PARAM_PAGE)) {
-
-		/*
-		 * The nand_flash_detect_ext_param_page() uses the
-		 * Change Read Column command which maybe not supported
-		 * by the chip->legacy.cmdfunc. So try to update the
-		 * chip->legacy.cmdfunc now. We do not replace user supplied
-		 * command function.
-		 */
-		nand_legacy_adjust_cmdfunc(chip);
-
-		/* The Extended Parameter Page is supported since ONFI 2.1. */
-		if (nand_flash_detect_ext_param_page(chip, p))
-			pr_warn("Failed to detect ONFI extended param page\n");
-	} else {
-		pr_warn("Could not retrieve ONFI ECC requirements\n");
+		base->ecc.requirements.strength = p->ecc_bits;
+		base->ecc.requirements.step_size = 512;
 	}
 
-	/* Save some parameters from the parameter page for future use */
-	if (le16_to_cpu(p->opt_cmd) & ONFI_OPT_CMD_SET_GET_FEATURES) {
-		chip->parameters.supports_set_get_features = true;
-		bitmap_set(chip->parameters.get_feature_list,
-			   ONFI_FEATURE_ADDR_TIMING_MODE, 1);
-		bitmap_set(chip->parameters.set_feature_list,
-			   ONFI_FEATURE_ADDR_TIMING_MODE, 1);
-	}
-
-	onfi = kzalloc(sizeof(*onfi), GFP_KERNEL);
-	if (!onfi) {
-		ret = -ENOMEM;
-		goto free_model;
-	}
-
-	onfi->version = onfi_version;
-	onfi->tPROG = le16_to_cpu(p->t_prog);
-	onfi->tBERS = le16_to_cpu(p->t_bers);
-	onfi->tR = le16_to_cpu(p->t_r);
-	onfi->tCCS = le16_to_cpu(p->t_ccs);
-	onfi->async_timing_mode = le16_to_cpu(p->async_timing_mode);
-	onfi->vendor_revision = le16_to_cpu(p->vendor_revision);
-	memcpy(onfi->vendor, p->vendor, sizeof(p->vendor));
-	chip->parameters.onfi = onfi;
+	ret = base->helper.init_intf_data(base, p);
 
 	/* Identification done, free the full ONFI parameter page and exit */
-	kfree(p);
-
-	return 1;
-
-free_model:
-	kfree(chip->parameters.model);
 free_onfi_param_page:
 	kfree(p);
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index b3a5506a891b..3f7e2b495e93 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -13,6 +13,7 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand-ecc-sw-hamming.h>
 #include <linux/mtd/nand-ecc-sw-bch.h>
+#include <linux/mtd/onfi.h>
 
 struct nand_device;
 
@@ -269,6 +270,24 @@ struct nand_ecc {
 	struct nand_ecc_engine *engine;
 };
 
+/**
+ * struct onfi_helper - ONFI helper functions that should be implemented by
+ * specialized layers (raw NAND, SPI NAND, etc.)
+ * @page: Page number for ONFI parameter table
+ * @check_revision: Check ONFI revision number
+ * @parameter_page_read: Function to read parameter pages
+ * @init_intf_data: Initialize interface specific data or fixups
+ */
+struct onfi_helper {
+	u8 page;
+	int (*check_revision)(struct nand_device *base,
+			      struct nand_onfi_params *p, int *onfi_version);
+	int (*parameter_page_read)(struct nand_device *base, u8 page,
+				   void *buf, unsigned int len);
+	int (*init_intf_data)(struct nand_device *base,
+			      struct nand_onfi_params *p);
+};
+
 /**
  * struct nand_device - NAND device
  * @mtd: MTD instance attached to the NAND device
@@ -276,6 +295,7 @@ struct nand_ecc {
  * @rowconv: position to row address converter
  * @bbt: bad block table info
  * @ops: NAND operations attached to the NAND device
+ * @helper: Helper functions to detect and initialize ONFI NAND
  *
  * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND, OneNAND)
  * should declare their own NAND object embedding a nand_device struct (that's
@@ -294,6 +314,7 @@ struct nand_device {
 	struct nand_row_converter rowconv;
 	struct nand_bbt bbt;
 	const struct nand_ops *ops;
+	struct onfi_helper helper;
 };
 
 /**
@@ -888,4 +909,13 @@ static inline bool nanddev_bbt_is_initialized(struct nand_device *nand)
 int nanddev_mtd_erase(struct mtd_info *mtd, struct erase_info *einfo);
 int nanddev_mtd_max_bad_blocks(struct mtd_info *mtd, loff_t offs, size_t len);
 
+/* ONFI functions */
+u16 onfi_crc16(u16 crc, u8 const *p, size_t len);
+void nand_bit_wise_majority(const void **srcbufs,
+			    unsigned int nsrcbufs,
+					void *dstbuf,
+					unsigned int bufsize);
+void sanitize_string(u8 *s, size_t len);
+int nand_onfi_detect(struct nand_device *base);
+
 #endif /* __LINUX_MTD_NAND_H */
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 174d2d27200f..bcb18cade2e8 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1079,6 +1079,11 @@ static inline struct mtd_info *nand_to_mtd(struct nand_chip *chip)
 	return &chip->base.mtd;
 }
 
+static inline struct nand_chip *device_to_nand(struct nand_device *base)
+{
+	return container_of(base, struct nand_chip, base);
+}
+
 static inline void *nand_get_controller_data(struct nand_chip *chip)
 {
 	return chip->priv;
-- 
2.17.1


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