[MTD] NAND Replace oobinfo by ecclayout

The nand_oobinfo structure is not fitting the newer error correction
demands anymore. Replace it by struct nand_ecclayout and fixup the users
all over the place. Keep the nand_oobinfo based ioctl for user space
compability reasons.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/mtd/mtdchar.c

@@ -512,14 +512,36 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
 		break;
 	}
 
+	/* Legacy interface */
 	case MEMGETOOBSEL:
 	{
-		if (copy_to_user(argp, mtd->oobinfo,
-				 sizeof(struct nand_oobinfo)))
+		struct nand_oobinfo oi;
+
+		if (!mtd->ecclayout)
+			return -EOPNOTSUPP;
+		if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
+			return -EINVAL;
+
+		oi.useecc = MTD_NANDECC_AUTOPLACE;
+		memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
+		memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
+		       sizeof(oi.oobfree));
+
+		if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 			return -EFAULT;
 		break;
 	}
 
+	case ECCGETLAYOUT:
+
+		if (!mtd->ecclayout)
+			return -EOPNOTSUPP;
+
+		if (copy_to_user(argp, &mtd->ecclayout,
+				 sizeof(struct nand_ecclayout)))
+			return -EFAULT;
+		break;
+
 	case MEMGETBADBLOCK:
 	{
 		loff_t offs;

drivers/mtd/mtdconcat.c

@@ -766,7 +766,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	concat->mtd.oobinfo = subdev[0]->oobinfo;
+	concat->mtd.ecclayout = subdev[0]->ecclayout;
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;

drivers/mtd/mtdpart.c

@@ -434,7 +434,7 @@ int add_mtd_partitions(struct mtd_info *master,
 				parts[i].name);
 		}
 
-		slave->mtd.oobinfo = master->oobinfo;
+		slave->mtd.ecclayout = master->ecclayout;
 
 		if(parts[i].mtdp)
 		{	/* store the object pointer (caller may or may not register it */

drivers/mtd/nand/diskonchip.c

@@ -1058,8 +1058,7 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
  * safer.  The only problem with it is that any code that parses oobfree must
  * be able to handle out-of-order segments.
  */
-static struct nand_oobinfo doc200x_oobinfo = {
-	.useecc = MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout doc200x_oobinfo = {
 	.eccbytes = 6,
 	.eccpos = {0, 1, 2, 3, 4, 5},
 	.oobfree = {{8, 8}, {6, 2}}
@@ -1662,7 +1661,7 @@ static int __init doc_probe(unsigned long physadr)
 	nand->ecc.calculate	= doc200x_calculate_ecc;
 	nand->ecc.correct	= doc200x_correct_data;
 
-	nand->autooob		= &doc200x_oobinfo;
+	nand->ecc.layout	= &doc200x_oobinfo;
 	nand->ecc.mode		= NAND_ECC_HW_SYNDROME;
 	nand->ecc.size		= 512;
 	nand->ecc.bytes		= 6;

drivers/mtd/nand/nand_base.c

@@ -52,28 +52,33 @@
 #endif
 
 /* Define default oob placement schemes for large and small page devices */
-static struct nand_oobinfo nand_oob_8 = {
-	.useecc = MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout nand_oob_8 = {
 	.eccbytes = 3,
 	.eccpos = {0, 1, 2},
-	.oobfree = {{3, 2}, {6, 2}}
+	.oobfree = {
+		{.offset = 3,
+		 .length = 2},
+		{.offset = 6,
+		 .length = 2}}
 };
 
-static struct nand_oobinfo nand_oob_16 = {
-	.useecc = MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout nand_oob_16 = {
 	.eccbytes = 6,
 	.eccpos = {0, 1, 2, 3, 6, 7},
-	.oobfree = {{8, 8}}
+	.oobfree = {
+		{.offset = 8,
+		 . length = 8}}
 };
 
-static struct nand_oobinfo nand_oob_64 = {
-	.useecc = MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout nand_oob_64 = {
 	.eccbytes = 24,
 	.eccpos = {
 		   40, 41, 42, 43, 44, 45, 46, 47,
 		   48, 49, 50, 51, 52, 53, 54, 55,
 		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {{2, 38}}
+	.oobfree = {
+		{.offset = 2,
+		 .length = 38}}
 };
 
 /* This is used for padding purposes in nand_write_oob */
@@ -749,7 +754,7 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers.ecccalc;
 	uint8_t *ecc_code = chip->buffers.ecccode;
-	int *eccpos = chip->autooob->eccpos;
+	int *eccpos = chip->ecc.layout->eccpos;
 
 	chip->read_buf(mtd, buf, mtd->writesize);
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -795,7 +800,7 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers.ecccalc;
 	uint8_t *ecc_code = chip->buffers.ecccode;
-	int *eccpos = chip->autooob->eccpos;
+	int *eccpos = chip->ecc.layout->eccpos;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_READ);
@@ -1198,7 +1203,7 @@ static void nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers.ecccalc;
 	const uint8_t *p = buf;
-	int *eccpos = chip->autooob->eccpos;
+	int *eccpos = chip->ecc.layout->eccpos;
 
 	if (chip->ecc.mode != NAND_ECC_NONE) {
 		/* Software ecc calculation */
@@ -1227,7 +1232,7 @@ static void nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers.ecccalc;
 	const uint8_t *p = buf;
-	int *eccpos = chip->autooob->eccpos;
+	int *eccpos = chip->ecc.layout->eccpos;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -2124,16 +2129,16 @@ int nand_scan(struct mtd_info *mtd, int maxchips)
 	/*
 	 * If no default placement scheme is given, select an appropriate one
 	 */
-	if (!chip->autooob) {
+	if (!chip->ecc.layout) {
 		switch (mtd->oobsize) {
 		case 8:
-			chip->autooob = &nand_oob_8;
+			chip->ecc.layout = &nand_oob_8;
 			break;
 		case 16:
-			chip->autooob = &nand_oob_16;
+			chip->ecc.layout = &nand_oob_16;
 			break;
 		case 64:
-			chip->autooob = &nand_oob_64;
+			chip->ecc.layout = &nand_oob_64;
 			break;
 		default:
 			printk(KERN_WARNING "No oob scheme defined for "
@@ -2197,6 +2202,15 @@ int nand_scan(struct mtd_info *mtd, int maxchips)
 		BUG();
 	}
 
+	/*
+	 * The number of bytes available for a client to place data into
+	 * the out of band area
+	 */
+	chip->ecc.layout->oobavail = 0;
+	for (i = 0; chip->ecc.layout->oobfree[i].length; i++)
+		chip->ecc.layout->oobavail +=
+			chip->ecc.layout->oobfree[i].length;
+
 	/*
 	 * Set the number of read / write steps for one page depending on ECC
 	 * mode
@@ -2236,8 +2250,8 @@ int nand_scan(struct mtd_info *mtd, int maxchips)
 	mtd->block_isbad = nand_block_isbad;
 	mtd->block_markbad = nand_block_markbad;
 
-	/* and make the autooob the default one */
-	mtd->oobinfo = chip->autooob;
+	/* propagate ecc.layout to mtd_info */
+	mtd->ecclayout = chip->ecc.layout;
 
 	/* Check, if we should skip the bad block table scan */
 	if (chip->options & NAND_SKIP_BBTSCAN)

drivers/mtd/nand/ndfc.c

@@ -168,7 +168,7 @@ static void ndfc_chip_init(struct ndfc_nand_mtd *mtd)
 	chip->ecc.mode = NAND_ECC_HW;
 	chip->ecc.size = 256;
 	chip->ecc.bytes = 3;
-	chip->autooob = mtd->pl_chip->oobinfo;
+	chip->ecclayout = mtd->pl_chip->ecclayout;
 	mtd->mtd.priv = chip;
 	mtd->mtd.owner = THIS_MODULE;
 }

drivers/mtd/nand/rtc_from4.c

@@ -142,8 +142,7 @@ static struct rs_control *rs_decoder;
 /*
  *      hardware specific Out Of Band information
  */
-static struct nand_oobinfo rtc_from4_nand_oobinfo = {
-	.useecc = MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout rtc_from4_nand_oobinfo = {
 	.eccbytes = 32,
 	.eccpos = {
 		   0, 1, 2, 3, 4, 5, 6, 7,
@@ -574,7 +573,7 @@ static int __init rtc_from4_init(void)
 	/* return the status of extra status and ECC checks */
 	this->errstat = rtc_from4_errstat;
 	/* set the nand_oobinfo to support FPGA H/W error detection */
-	this->autooob = &rtc_from4_nand_oobinfo;
+	this->ecc.layout = &rtc_from4_nand_oobinfo;
 	this->ecc.hwctl = rtc_from4_enable_hwecc;
 	this->ecc.calculate = rtc_from4_calculate_ecc;
 	this->ecc.correct = rtc_from4_correct_data;

drivers/mtd/nand/s3c2410.c

@@ -76,8 +76,7 @@ static int hardware_ecc = 0;
 /* new oob placement block for use with hardware ecc generation
  */
 
-static struct nand_oobinfo nand_hw_eccoob = {
-	.useecc = MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout nand_hw_eccoob = {
 	.eccbytes = 3,
 	.eccpos = {0, 1, 2},
 	.oobfree = {{8, 8}}
@@ -502,7 +501,7 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
 		chip->ecc.mode	    = NAND_ECC_HW;
 		chip->ecc.size	    = 512;
 		chip->ecc.bytes	    = 3;
-		chip->autooob       = &nand_hw_eccoob;
+		chip->ecc.layout    = &nand_hw_eccoob;
 
 		if (info->is_s3c2440) {
 			chip->ecc.hwctl     = s3c2440_nand_enable_hwecc;

drivers/mtd/nand/sharpsl.c

@@ -115,8 +115,7 @@ static struct nand_bbt_descr sharpsl_akita_bbt = {
 	.pattern = scan_ff_pattern
 };
 
-static struct nand_oobinfo akita_oobinfo = {
-	.useecc = MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout akita_oobinfo = {
 	.eccbytes = 24,
 	.eccpos = {
 		   0x5, 0x1, 0x2, 0x3, 0x6, 0x7, 0x15, 0x11,
@@ -202,7 +201,7 @@ static int __init sharpsl_nand_init(void)
 	this->badblock_pattern = &sharpsl_bbt;
 	if (machine_is_akita() || machine_is_borzoi()) {
 		this->badblock_pattern = &sharpsl_akita_bbt;
-		this->autooob = &akita_oobinfo;
+		this->ecc.layout = &akita_oobinfo;
 	}
 	this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 	this->ecc.calculate = sharpsl_nand_calculate_ecc;

drivers/mtd/onenand/onenand_base.c

@@ -23,8 +23,7 @@
 /**
  * onenand_oob_64 - oob info for large (2KB) page
  */
-static struct nand_oobinfo onenand_oob_64 = {
-	.useecc		= MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout onenand_oob_64 = {
 	.eccbytes	= 20,
 	.eccpos		= {
 		8, 9, 10, 11, 12,
@@ -41,8 +40,7 @@ static struct nand_oobinfo onenand_oob_64 = {
 /**
  * onenand_oob_32 - oob info for middle (1KB) page
  */
-static struct nand_oobinfo onenand_oob_32 = {
-	.useecc		= MTD_NANDECC_AUTOPLACE,
+static struct nand_ecclayout onenand_oob_32 = {
 	.eccbytes	= 10,
 	.eccpos		= {
 		8, 9, 10, 11, 12,
@@ -1747,22 +1745,22 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	switch (mtd->oobsize) {
 	case 64:
-		this->autooob = &onenand_oob_64;
+		this->ecclayout = &onenand_oob_64;
 		break;
 
 	case 32:
-		this->autooob = &onenand_oob_32;
+		this->ecclayout = &onenand_oob_32;
 		break;
 
 	default:
 		printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
 			mtd->oobsize);
 		/* To prevent kernel oops */
-		this->autooob = &onenand_oob_32;
+		this->ecclayout = &onenand_oob_32;
 		break;
 	}
 
-	mtd->oobinfo = this->autooob;
+	mtd->ecclayout = this->ecclayout;
 
 	/* Fill in remaining MTD driver data */
 	mtd->type = MTD_NANDFLASH;

fs/jffs2/jffs2_fs_sb.h

@@ -107,7 +107,7 @@ struct jffs2_sb_info {
 	struct rw_semaphore wbuf_sem;	/* Protects the write buffer */
 
 	/* Information about out-of-band area usage... */
-	struct nand_oobinfo *oobinfo;
+	struct nand_ecclayout *ecclayout;
 	uint32_t badblock_pos;
 	uint32_t fsdata_pos;
 	uint32_t fsdata_len;

fs/jffs2/wbuf.c

@@ -1140,18 +1140,9 @@ int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *
 	return 1;
 }
 
-#define NAND_JFFS2_OOB16_FSDALEN	8
-
-static struct nand_oobinfo jffs2_oobinfo_docecc = {
-	.useecc = MTD_NANDECC_PLACE,
-	.eccbytes = 6,
-	.eccpos = {0,1,2,3,4,5}
-};
-
-
 static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
 {
-	struct nand_oobinfo *oinfo = c->mtd->oobinfo;
+	struct nand_ecclayout *oinfo = c->mtd->ecclayout;
 
 	/* Do this only, if we have an oob buffer */
 	if (!c->mtd->oobsize)
@@ -1161,33 +1152,23 @@ static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
 	c->cleanmarker_size = 0;
 
 	/* Should we use autoplacement ? */
-	if (oinfo && oinfo->useecc == MTD_NANDECC_AUTOPLACE) {
-		D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n"));
-		/* Get the position of the free bytes */
-		if (!oinfo->oobfree[0][1]) {
-			printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep. Autoplacement selected and no empty space in oob\n");
-			return -ENOSPC;
-		}
-		c->fsdata_pos = oinfo->oobfree[0][0];
-		c->fsdata_len = oinfo->oobfree[0][1];
-		if (c->fsdata_len > 8)
-			c->fsdata_len = 8;
-	} else {
-		/* This is just a legacy fallback and should go away soon */
-		switch(c->mtd->ecctype) {
-		case MTD_ECC_RS_DiskOnChip:
-			printk(KERN_WARNING "JFFS2 using DiskOnChip hardware ECC without autoplacement. Fix it!\n");
-			c->oobinfo = &jffs2_oobinfo_docecc;
-			c->fsdata_pos = 6;
-			c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN;
-			c->badblock_pos = 15;
-			break;
+	if (!oinfo) {
+		D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n"));
+		return -EINVAL;
+	}
 
-		default:
-			D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n"));
-			return -EINVAL;
-		}
+	D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n"));
+	/* Get the position of the free bytes */
+	if (!oinfo->oobfree[0].length) {
+		printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep."
+			" Autoplacement selected and no empty space in oob\n");
+		return -ENOSPC;
 	}
+	c->fsdata_pos = oinfo->oobfree[0].offset;
+	c->fsdata_len = oinfo->oobfree[0].length;
+	if (c->fsdata_len > 8)
+		c->fsdata_len = 8;
+
 	return 0;
 }
 

include/linux/mtd/inftl.h

@@ -46,7 +46,7 @@ struct INFTLrecord {
         unsigned int nb_blocks;		/* number of physical blocks */
         unsigned int nb_boot_blocks;	/* number of blocks used by the bios */
         struct erase_info instr;
-        struct nand_oobinfo oobinfo;
+        struct nand_ecclayout oobinfo;
 };
 
 int INFTL_mount(struct INFTLrecord *s);

include/linux/mtd/mtd.h

@@ -101,8 +101,8 @@ struct mtd_info {
 	char *name;
 	int index;
 
-	/* oobinfo structure pointer - read only ! */
-	struct nand_oobinfo *oobinfo;
+	/* ecc layout structure pointer - read only ! */
+	struct nand_ecclayout *ecclayout;
 
 	/* Data for variable erase regions. If numeraseregions is zero,
 	 * it means that the whole device has erasesize as given above.

include/linux/mtd/nand.h

@@ -244,6 +244,7 @@ struct nand_ecc_ctrl {
 	int			total;
 	int			prepad;
 	int			postpad;
+	struct nand_ecclayout	*layout;
 	void			(*hwctl)(struct mtd_info *mtd, int mode);
 	int			(*calculate)(struct mtd_info *mtd,
 					     const uint8_t *dat,
@@ -318,7 +319,7 @@ struct nand_buffers {
  * @chipsize:		[INTERN] the size of one chip for multichip arrays
  * @pagemask:		[INTERN] page number mask = number of (pages / chip) - 1
  * @pagebuf:		[INTERN] holds the pagenumber which is currently in data_buf
- * @autooob:		[REPLACEABLE] the default (auto)placement scheme
+ * @ecclayout:		[REPLACEABLE] the default ecc placement scheme
  * @bbt:		[INTERN] bad block table pointer
  * @bbt_td:		[REPLACEABLE] bad block table descriptor for flash lookup
  * @bbt_md:		[REPLACEABLE] bad block table mirror descriptor
@@ -368,7 +369,7 @@ struct nand_chip {
 
 	uint8_t		*oob_poi;
 	struct nand_hw_control  *controller;
-	struct nand_oobinfo	*autooob;
+	struct nand_ecclayout	*ecclayout;
 
 	struct nand_ecc_ctrl ecc;
 	struct nand_buffers buffers;
@@ -522,7 +523,7 @@ extern int nand_do_read(struct mtd_info *mtd, loff_t from, size_t len,
  * @partitions:		mtd partition list
  * @chip_delay:		R/B delay value in us
  * @options:		Option flags, e.g. 16bit buswidth
- * @oobinfo:		oob info structure (ecc placement)
+ * @ecclayout:		ecc layout info structure
  * @priv:		hardware controller specific settings
  */
 struct platform_nand_chip {
@@ -530,7 +531,7 @@ struct platform_nand_chip {
 	int			chip_offset;
 	int			nr_partitions;
 	struct mtd_partition	*partitions;
-	struct nand_oobinfo	*oobinfo;
+	struct nand_ecclayout	*ecclayout;
 	int			chip_delay;
 	unsigned int		options;
 	void			*priv;

include/linux/mtd/nftl.h

@@ -37,7 +37,7 @@ struct NFTLrecord {
         unsigned int nb_blocks;		/* number of physical blocks */
         unsigned int nb_boot_blocks;	/* number of blocks used by the bios */
         struct erase_info instr;
-	struct nand_oobinfo oobinfo;
+	struct nand_ecclayout oobinfo;
 };
 
 int NFTL_mount(struct NFTLrecord *s);

include/linux/mtd/onenand.h

@@ -77,7 +77,7 @@ struct onenand_bufferram {
  * @param chip_lock	[INTERN] spinlock used to protect access to this structure and the chip
  * @param wq		[INTERN] wait queue to sleep on if a OneNAND operation is in progress
  * @param state		[INTERN] the current state of the OneNAND device
- * @param autooob	[REPLACEABLE] the default (auto)placement scheme
+ * @param ecclayout	[REPLACEABLE] the default ecc placement scheme
  * @param bbm		[REPLACEABLE] pointer to Bad Block Management
  * @param priv		[OPTIONAL] pointer to private chip date
  */
@@ -113,9 +113,9 @@ struct onenand_chip {
 	onenand_state_t		state;
 	unsigned char		*page_buf;
 
-	struct nand_oobinfo	*autooob;
+	struct nand_ecclayout	*ecclayout;
 
-	void 			*bbm;
+	void			*bbm;
 
 	void			*priv;
 };

include/linux/mtd/partitions.h

@@ -41,7 +41,7 @@ struct mtd_partition {
 	u_int32_t size;			/* partition size */
 	u_int32_t offset;		/* offset within the master MTD space */
 	u_int32_t mask_flags;		/* master MTD flags to mask out for this partition */
-	struct nand_oobinfo *oobsel;	/* out of band layout for this partition (NAND only)*/
+	struct nand_ecclayout *ecclayout;	/* out of band layout for this partition (NAND only)*/
 	struct mtd_info **mtdp;		/* pointer to store the MTD object */
 };
 

include/mtd/mtd-abi.h

@@ -82,12 +82,12 @@ struct otp_info {
 	uint32_t locked;
 };
 
-#define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
-#define MEMERASE                _IOW('M', 2, struct erase_info_user)
-#define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
-#define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
-#define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
-#define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
+#define MEMGETINFO		_IOR('M', 1, struct mtd_info_user)
+#define MEMERASE		_IOW('M', 2, struct erase_info_user)
+#define MEMWRITEOOB		_IOWR('M', 3, struct mtd_oob_buf)
+#define MEMREADOOB		_IOWR('M', 4, struct mtd_oob_buf)
+#define MEMLOCK			_IOW('M', 5, struct erase_info_user)
+#define MEMUNLOCK		_IOW('M', 6, struct erase_info_user)
 #define MEMGETREGIONCOUNT	_IOR('M', 7, int)
 #define MEMGETREGIONINFO	_IOWR('M', 8, struct region_info_user)
 #define MEMSETOOBSEL		_IOW('M', 9, struct nand_oobinfo)
@@ -97,8 +97,13 @@ struct otp_info {
 #define OTPSELECT		_IOR('M', 13, int)
 #define OTPGETREGIONCOUNT	_IOW('M', 14, int)
 #define OTPGETREGIONINFO	_IOW('M', 15, struct otp_info)
-#define OTPLOCK		_IOR('M', 16, struct otp_info)
+#define OTPLOCK			_IOR('M', 16, struct otp_info)
+#define ECCGETLAYOUT		_IOR('M', 17, struct nand_ecclayout)
 
+/*
+ * Obsolete legacy interface. Keep it in order not to break userspace
+ * interfaces
+ */
 struct nand_oobinfo {
 	uint32_t useecc;
 	uint32_t eccbytes;
@@ -106,4 +111,21 @@ struct nand_oobinfo {
 	uint32_t eccpos[32];
 };
 
+struct nand_oobfree {
+	uint32_t offset;
+	uint32_t length;
+};
+
+#define MTD_MAX_OOBFREE_ENTRIES	8
+/*
+ * ECC layout control structure. Exported to userspace for
+ * diagnosis and to allow creation of raw images
+ */
+struct nand_ecclayout {
+	uint32_t eccbytes;
+	uint32_t eccpos[64];
+	uint32_t oobavail;
+	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
+};
+
 #endif /* __MTD_ABI_H__ */

include/mtd/mtd-user.h

@@ -16,5 +16,6 @@ typedef struct mtd_info_user mtd_info_t;
 typedef struct erase_info_user erase_info_t;
 typedef struct region_info_user region_info_t;
 typedef struct nand_oobinfo nand_oobinfo_t;
+typedef struct nand_ecclayout nand_ecclayout_t;
 
 #endif /* __MTD_USER_H__ */