Merge tag 'for-linus-20130301' of git://git.infradead.org/linux-mtd

Pull MTD update from David Woodhouse:
 "Fairly unexciting MTD merge for 3.9:

   - misc clean-ups in the MTD command-line partitioning parser
     (cmdlinepart)
   - add flash locking support for STmicro chips serial flash chips, as
     well as for CFI command set 2 chips.
   - new driver for the ELM error correction HW module found in various
     TI chips, enable the OMAP NAND driver to use the ELM HW error
     correction
   - added number of new serial flash IDs
   - various fixes and improvements in the gpmi NAND driver
   - bcm47xx NAND driver improvements
   - make the mtdpart module actually removable"

* tag 'for-linus-20130301' of git://git.infradead.org/linux-mtd: (45 commits)
  mtd: map: BUG() in non handled cases
  mtd: bcm47xxnflash: use pr_fmt for module prefix in messages
  mtd: davinci_nand: Use managed resources
  mtd: mtd_torturetest can cause stack overflows
  mtd: physmap_of: Convert device allocation to managed devm_kzalloc()
  mtd: at91: atmel_nand: for PMECC, add code to check the ONFI parameter ECC requirement.
  mtd: atmel_nand: make pmecc-cap, pmecc-sector-size in dts is optional.
  mtd: atmel_nand: avoid to report an error when lookup table offset is 0.
  mtd: bcm47xxsflash: adjust names of bus-specific functions
  mtd: bcm47xxpart: improve probing of nvram partition
  mtd: bcm47xxpart: add support for other erase sizes
  mtd: bcm47xxnflash: register this as normal driver
  mtd: bcm47xxnflash: fix message
  mtd: bcm47xxsflash: register this as normal driver
  mtd: bcm47xxsflash: write number of written bytes
  mtd: gpmi: add sanity check for the ECC
  mtd: gpmi: set the Golois Field bit for mx6q's BCH
  mtd: devices: elm: Removes <xx> literals in elm DT node
  mtd: gpmi: fix a dereferencing freed memory error
  mtd: fix the wrong timeo for panic_nand_wait()
  ...

Documentation/devicetree/bindings/mtd/elm.txt

@@ -0,0 +1,16 @@
+Error location module
+
+Required properties:
+- compatible: Must be "ti,am33xx-elm"
+- reg: physical base address and size of the registers map.
+- interrupts: Interrupt number for the elm.
+
+Optional properties:
+- ti,hwmods: Name of the hwmod associated to the elm
+
+Example:
+elm: elm@0 {
+	compatible = "ti,am3352-elm";
+	reg = <0x48080000 0x2000>;
+	interrupts = <4>;
+};

Documentation/devicetree/bindings/mtd/mtd-physmap.txt

@@ -26,6 +26,9 @@ file systems on embedded devices.
  - linux,mtd-name: allow to specify the mtd name for retro capability with
    physmap-flash drivers as boot loader pass the mtd partition via the old
    device name physmap-flash.
+ - use-advanced-sector-protection: boolean to enable support for the
+   advanced sector protection (Spansion: PPB - Persistent Protection
+   Bits) locking.
 
 For JEDEC compatible devices, the following additional properties
 are defined:

drivers/mtd/Kconfig

@@ -74,8 +74,8 @@ config MTD_REDBOOT_PARTS_READONLY
 endif # MTD_REDBOOT_PARTS
 
 config MTD_CMDLINE_PARTS
-	bool "Command line partition table parsing"
-	depends on MTD = "y"
+	tristate "Command line partition table parsing"
+	depends on MTD
 	---help---
 	  Allow generic configuration of the MTD partition tables via the kernel
 	  command line. Multiple flash resources are supported for hardware where

drivers/mtd/ar7part.c

@@ -142,7 +142,13 @@ static int __init ar7_parser_init(void)
 	return register_mtd_parser(&ar7_parser);
 }
 
+static void __exit ar7_parser_exit(void)
+{
+	deregister_mtd_parser(&ar7_parser);
+}
+
 module_init(ar7_parser_init);
+module_exit(ar7_parser_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR(	"Felix Fietkau <nbd@openwrt.org>, "

drivers/mtd/bcm47xxpart.c

@@ -19,12 +19,6 @@
 /* 10 parts were found on sflash on Netgear WNDR4500 */
 #define BCM47XXPART_MAX_PARTS		12
 
-/*
- * Amount of bytes we read when analyzing each block of flash memory.
- * Set it big enough to allow detecting partition and reading important data.
- */
-#define BCM47XXPART_BYTES_TO_READ	0x404
-
 /* Magics */
 #define BOARD_DATA_MAGIC		0x5246504D	/* MPFR */
 #define POT_MAGIC1			0x54544f50	/* POTT */
@@ -59,13 +53,21 @@ static int bcm47xxpart_parse(struct mtd_info *master,
 	uint32_t *buf;
 	size_t bytes_read;
 	uint32_t offset;
-	uint32_t blocksize = 0x10000;
+	uint32_t blocksize = master->erasesize;
 	struct trx_header *trx;
+	int trx_part = -1;
+	int last_trx_part = -1;
+	int max_bytes_to_read = 0x8004;
+
+	if (blocksize <= 0x10000)
+		blocksize = 0x10000;
+	if (blocksize == 0x20000)
+		max_bytes_to_read = 0x18004;
 
 	/* Alloc */
 	parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
 			GFP_KERNEL);
-	buf = kzalloc(BCM47XXPART_BYTES_TO_READ, GFP_KERNEL);
+	buf = kzalloc(max_bytes_to_read, GFP_KERNEL);
 
 	/* Parse block by block looking for magics */
 	for (offset = 0; offset <= master->size - blocksize;
@@ -80,7 +82,7 @@ static int bcm47xxpart_parse(struct mtd_info *master,
 		}
 
 		/* Read beginning of the block */
-		if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
+		if (mtd_read(master, offset, max_bytes_to_read,
 			     &bytes_read, (uint8_t *)buf) < 0) {
 			pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
 			       offset);
@@ -95,9 +97,16 @@ static int bcm47xxpart_parse(struct mtd_info *master,
 		}
 
 		/* Standard NVRAM */
-		if (buf[0x000 / 4] == NVRAM_HEADER) {
+		if (buf[0x000 / 4] == NVRAM_HEADER ||
+		    buf[0x1000 / 4] == NVRAM_HEADER ||
+		    buf[0x8000 / 4] == NVRAM_HEADER ||
+		    (blocksize == 0x20000 && (
+		      buf[0x10000 / 4] == NVRAM_HEADER ||
+		      buf[0x11000 / 4] == NVRAM_HEADER ||
+		      buf[0x18000 / 4] == NVRAM_HEADER))) {
 			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
 					     offset, 0);
+			offset = rounddown(offset, blocksize);
 			continue;
 		}
 
@@ -131,6 +140,10 @@ static int bcm47xxpart_parse(struct mtd_info *master,
 		if (buf[0x000 / 4] == TRX_MAGIC) {
 			trx = (struct trx_header *)buf;
 
+			trx_part = curr_part;
+			bcm47xxpart_add_part(&parts[curr_part++], "firmware",
+					     offset, 0);
+
 			i = 0;
 			/* We have LZMA loader if offset[2] points to sth */
 			if (trx->offset[2]) {
@@ -154,6 +167,8 @@ static int bcm47xxpart_parse(struct mtd_info *master,
 					     offset + trx->offset[i], 0);
 			i++;
 
+			last_trx_part = curr_part - 1;
+
 			/*
 			 * We have whole TRX scanned, skip to the next part. Use
 			 * roundown (not roundup), as the loop will increase
@@ -169,11 +184,15 @@ static int bcm47xxpart_parse(struct mtd_info *master,
 	 * Assume that partitions end at the beginning of the one they are
 	 * followed by.
 	 */
-	for (i = 0; i < curr_part - 1; i++)
-		parts[i].size = parts[i + 1].offset - parts[i].offset;
-	if (curr_part > 0)
-		parts[curr_part - 1].size =
-				master->size - parts[curr_part - 1].offset;
+	for (i = 0; i < curr_part; i++) {
+		u64 next_part_offset = (i < curr_part - 1) ?
+				       parts[i + 1].offset : master->size;
+
+		parts[i].size = next_part_offset - parts[i].offset;
+		if (i == last_trx_part && trx_part >= 0)
+			parts[trx_part].size = next_part_offset -
+					       parts[trx_part].offset;
+	}
 
 	*pparts = parts;
 	return curr_part;

drivers/mtd/chips/cfi_cmdset_0002.c

@@ -33,6 +33,8 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/reboot.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/mtd/map.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/cfi.h>
@@ -74,6 +76,10 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad
 static int cfi_atmel_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 
+static int cfi_ppb_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int cfi_ppb_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+
 static struct mtd_chip_driver cfi_amdstd_chipdrv = {
 	.probe		= NULL, /* Not usable directly */
 	.destroy	= cfi_amdstd_destroy,
@@ -496,6 +502,7 @@ static void cfi_fixup_m29ew_delay_after_resume(struct cfi_private *cfi)
 struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
+	struct device_node __maybe_unused *np = map->device_node;
 	struct mtd_info *mtd;
 	int i;
 
@@ -570,6 +577,17 @@ struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
 			cfi_tell_features(extp);
 #endif
 
+#ifdef CONFIG_OF
+			if (np && of_property_read_bool(
+				    np, "use-advanced-sector-protection")
+			    && extp->BlkProtUnprot == 8) {
+				printk(KERN_INFO "  Advanced Sector Protection (PPB Locking) supported\n");
+				mtd->_lock = cfi_ppb_lock;
+				mtd->_unlock = cfi_ppb_unlock;
+				mtd->_is_locked = cfi_ppb_is_locked;
+			}
+#endif
+
 			bootloc = extp->TopBottom;
 			if ((bootloc < 2) || (bootloc > 5)) {
 				printk(KERN_WARNING "%s: CFI contains unrecognised boot "
@@ -2172,6 +2190,205 @@ static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 	return cfi_varsize_frob(mtd, do_atmel_unlock, ofs, len, NULL);
 }
 
+/*
+ * Advanced Sector Protection - PPB (Persistent Protection Bit) locking
+ */
+
+struct ppb_lock {
+	struct flchip *chip;
+	loff_t offset;
+	int locked;
+};
+
+#define MAX_SECTORS			512
+
+#define DO_XXLOCK_ONEBLOCK_LOCK		((void *)1)
+#define DO_XXLOCK_ONEBLOCK_UNLOCK	((void *)2)
+#define DO_XXLOCK_ONEBLOCK_GETLOCK	((void *)3)
+
+static int __maybe_unused do_ppb_xxlock(struct map_info *map,
+					struct flchip *chip,
+					unsigned long adr, int len, void *thunk)
+{
+	struct cfi_private *cfi = map->fldrv_priv;
+	unsigned long timeo;
+	int ret;
+
+	mutex_lock(&chip->mutex);
+	ret = get_chip(map, chip, adr + chip->start, FL_LOCKING);
+	if (ret) {
+		mutex_unlock(&chip->mutex);
+		return ret;
+	}
+
+	pr_debug("MTD %s(): XXLOCK 0x%08lx len %d\n", __func__, adr, len);
+
+	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
+			 cfi->device_type, NULL);
+	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
+			 cfi->device_type, NULL);
+	/* PPB entry command */
+	cfi_send_gen_cmd(0xC0, cfi->addr_unlock1, chip->start, map, cfi,
+			 cfi->device_type, NULL);
+
+	if (thunk == DO_XXLOCK_ONEBLOCK_LOCK) {
+		chip->state = FL_LOCKING;
+		map_write(map, CMD(0xA0), chip->start + adr);
+		map_write(map, CMD(0x00), chip->start + adr);
+	} else if (thunk == DO_XXLOCK_ONEBLOCK_UNLOCK) {
+		/*
+		 * Unlocking of one specific sector is not supported, so we
+		 * have to unlock all sectors of this device instead
+		 */
+		chip->state = FL_UNLOCKING;
+		map_write(map, CMD(0x80), chip->start);
+		map_write(map, CMD(0x30), chip->start);
+	} else if (thunk == DO_XXLOCK_ONEBLOCK_GETLOCK) {
+		chip->state = FL_JEDEC_QUERY;
+		/* Return locked status: 0->locked, 1->unlocked */
+		ret = !cfi_read_query(map, adr);
+	} else
+		BUG();
+
+	/*
+	 * Wait for some time as unlocking of all sectors takes quite long
+	 */
+	timeo = jiffies + msecs_to_jiffies(2000);	/* 2s max (un)locking */
+	for (;;) {
+		if (chip_ready(map, adr))
+			break;
+
+		if (time_after(jiffies, timeo)) {
+			printk(KERN_ERR "Waiting for chip to be ready timed out.\n");
+			ret = -EIO;
+			break;
+		}
+
+		UDELAY(map, chip, adr, 1);
+	}
+
+	/* Exit BC commands */
+	map_write(map, CMD(0x90), chip->start);
+	map_write(map, CMD(0x00), chip->start);
+
+	chip->state = FL_READY;
+	put_chip(map, chip, adr + chip->start);
+	mutex_unlock(&chip->mutex);
+
+	return ret;
+}
+
+static int __maybe_unused cfi_ppb_lock(struct mtd_info *mtd, loff_t ofs,
+				       uint64_t len)
+{
+	return cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len,
+				DO_XXLOCK_ONEBLOCK_LOCK);
+}
+
+static int __maybe_unused cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs,
+					 uint64_t len)
+{
+	struct mtd_erase_region_info *regions = mtd->eraseregions;
+	struct map_info *map = mtd->priv;
+	struct cfi_private *cfi = map->fldrv_priv;
+	struct ppb_lock *sect;
+	unsigned long adr;
+	loff_t offset;
+	uint64_t length;
+	int chipnum;
+	int i;
+	int sectors;
+	int ret;
+
+	/*
+	 * PPB unlocking always unlocks all sectors of the flash chip.
+	 * We need to re-lock all previously locked sectors. So lets
+	 * first check the locking status of all sectors and save
+	 * it for future use.
+	 */
+	sect = kzalloc(MAX_SECTORS * sizeof(struct ppb_lock), GFP_KERNEL);
+	if (!sect)
+		return -ENOMEM;
+
+	/*
+	 * This code to walk all sectors is a slightly modified version
+	 * of the cfi_varsize_frob() code.
+	 */
+	i = 0;
+	chipnum = 0;
+	adr = 0;
+	sectors = 0;
+	offset = 0;
+	length = mtd->size;
+
+	while (length) {
+		int size = regions[i].erasesize;
+
+		/*
+		 * Only test sectors that shall not be unlocked. The other
+		 * sectors shall be unlocked, so lets keep their locking
+		 * status at "unlocked" (locked=0) for the final re-locking.
+		 */
+		if ((adr < ofs) || (adr >= (ofs + len))) {
+			sect[sectors].chip = &cfi->chips[chipnum];
+			sect[sectors].offset = offset;
+			sect[sectors].locked = do_ppb_xxlock(
+				map, &cfi->chips[chipnum], adr, 0,
+				DO_XXLOCK_ONEBLOCK_GETLOCK);
+		}
+
+		adr += size;
+		offset += size;
+		length -= size;
+
+		if (offset == regions[i].offset + size * regions[i].numblocks)
+			i++;
+
+		if (adr >> cfi->chipshift) {
+			adr = 0;
+			chipnum++;
+
+			if (chipnum >= cfi->numchips)
+				break;
+		}
+
+		sectors++;
+		if (sectors >= MAX_SECTORS) {
+			printk(KERN_ERR "Only %d sectors for PPB locking supported!\n",
+			       MAX_SECTORS);
+			kfree(sect);
+			return -EINVAL;
+		}
+	}
+
+	/* Now unlock the whole chip */
+	ret = cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len,
+			       DO_XXLOCK_ONEBLOCK_UNLOCK);
+	if (ret) {
+		kfree(sect);
+		return ret;
+	}
+
+	/*
+	 * PPB unlocking always unlocks all sectors of the flash chip.
+	 * We need to re-lock all previously locked sectors.
+	 */
+	for (i = 0; i < sectors; i++) {
+		if (sect[i].locked)
+			do_ppb_xxlock(map, sect[i].chip, sect[i].offset, 0,
+				      DO_XXLOCK_ONEBLOCK_LOCK);
+	}
+
+	kfree(sect);
+	return ret;
+}
+
+static int __maybe_unused cfi_ppb_is_locked(struct mtd_info *mtd, loff_t ofs,
+					    uint64_t len)
+{
+	return cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len,
+				DO_XXLOCK_ONEBLOCK_GETLOCK) ? 1 : 0;
+}
 
 static void cfi_amdstd_sync (struct mtd_info *mtd)
 {

drivers/mtd/cmdlinepart.c

@@ -22,11 +22,22 @@
  *
  * mtdparts=<mtddef>[;<mtddef]
  * <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
- *              where <mtd-id> is the name from the "cat /proc/mtd" command
- * <partdef> := <size>[@offset][<name>][ro][lk]
+ * <partdef> := <size>[@<offset>][<name>][ro][lk]
  * <mtd-id>  := unique name used in mapping driver/device (mtd->name)
  * <size>    := standard linux memsize OR "-" to denote all remaining space
+ *              size is automatically truncated at end of device
+ *              if specified or trucated size is 0 the part is skipped
+ * <offset>  := standard linux memsize
+ *              if omitted the part will immediately follow the previous part
+ *              or 0 if the first part
  * <name>    := '(' NAME ')'
+ *              NAME will appear in /proc/mtd
+ *
+ * <size> and <offset> can be specified such that the parts are out of order
+ * in physical memory and may even overlap.
+ *
+ * The parts are assigned MTD numbers in the order they are specified in the
+ * command line regardless of their order in physical memory.
  *
  * Examples:
  *
@@ -70,6 +81,7 @@ struct cmdline_mtd_partition {
 static struct cmdline_mtd_partition *partitions;
 
 /* the command line passed to mtdpart_setup() */
+static char *mtdparts;
 static char *cmdline;
 static int cmdline_parsed;
 
@@ -330,6 +342,14 @@ static int parse_cmdline_partitions(struct mtd_info *master,
 		if (part->parts[i].size == SIZE_REMAINING)
 			part->parts[i].size = master->size - offset;
 
+		if (offset + part->parts[i].size > master->size) {
+			printk(KERN_WARNING ERRP
+			       "%s: partitioning exceeds flash size, truncating\n",
+			       part->mtd_id);
+			part->parts[i].size = master->size - offset;
+		}
+		offset += part->parts[i].size;
+
 		if (part->parts[i].size == 0) {
 			printk(KERN_WARNING ERRP
 			       "%s: skipping zero sized partition\n",
@@ -337,16 +357,8 @@ static int parse_cmdline_partitions(struct mtd_info *master,
 			part->num_parts--;
 			memmove(&part->parts[i], &part->parts[i + 1],
 				sizeof(*part->parts) * (part->num_parts - i));
-			continue;
-		}
-
-		if (offset + part->parts[i].size > master->size) {
-			printk(KERN_WARNING ERRP
-			       "%s: partitioning exceeds flash size, truncating\n",
-			       part->mtd_id);
-			part->parts[i].size = master->size - offset;
+			i--;
 		}
-		offset += part->parts[i].size;
 	}
 
 	*pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
@@ -365,7 +377,7 @@ static int parse_cmdline_partitions(struct mtd_info *master,
  *
  * This function needs to be visible for bootloaders.
  */
-static int mtdpart_setup(char *s)
+static int __init mtdpart_setup(char *s)
 {
 	cmdline = s;
 	return 1;
@@ -381,10 +393,21 @@ static struct mtd_part_parser cmdline_parser = {
 
 static int __init cmdline_parser_init(void)
 {
+	if (mtdparts)
+		mtdpart_setup(mtdparts);
 	return register_mtd_parser(&cmdline_parser);
 }
 
+static void __exit cmdline_parser_exit(void)
+{
+	deregister_mtd_parser(&cmdline_parser);
+}
+
 module_init(cmdline_parser_init);
+module_exit(cmdline_parser_exit);
+
+MODULE_PARM_DESC(mtdparts, "Partitioning specification");
+module_param(mtdparts, charp, 0);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");

drivers/mtd/devices/Makefile

@@ -17,8 +17,10 @@ obj-$(CONFIG_MTD_LART)		+= lart.o
 obj-$(CONFIG_MTD_BLOCK2MTD)	+= block2mtd.o
 obj-$(CONFIG_MTD_DATAFLASH)	+= mtd_dataflash.o
 obj-$(CONFIG_MTD_M25P80)	+= m25p80.o
+obj-$(CONFIG_MTD_NAND_OMAP_BCH)	+= elm.o
 obj-$(CONFIG_MTD_SPEAR_SMI)	+= spear_smi.o
 obj-$(CONFIG_MTD_SST25L)	+= sst25l.o
 obj-$(CONFIG_MTD_BCM47XXSFLASH)	+= bcm47xxsflash.o
 
-CFLAGS_docg3.o			+= -I$(src)
+
+CFLAGS_docg3.o			+= -I$(src)

drivers/mtd/devices/bcm47xxsflash.c

@@ -5,6 +5,8 @@
 #include <linux/platform_device.h>
 #include <linux/bcma/bcma.h>
 
+#include "bcm47xxsflash.h"
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Serial flash driver for BCMA bus");
 
@@ -13,26 +15,28 @@ static const char *probes[] = { "bcm47xxpart", NULL };
 static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
 			      size_t *retlen, u_char *buf)
 {
-	struct bcma_sflash *sflash = mtd->priv;
+	struct bcm47xxsflash *b47s = mtd->priv;
 
 	/* Check address range */
 	if ((from + len) > mtd->size)
 		return -EINVAL;
 
-	memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(sflash->window + from),
+	memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
 		      len);
+	*retlen = len;
 
 	return len;
 }
 
-static void bcm47xxsflash_fill_mtd(struct bcma_sflash *sflash,
-				   struct mtd_info *mtd)
+static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
 {
-	mtd->priv = sflash;
+	struct mtd_info *mtd = &b47s->mtd;
+
+	mtd->priv = b47s;
 	mtd->name = "bcm47xxsflash";
 	mtd->owner = THIS_MODULE;
 	mtd->type = MTD_ROM;
-	mtd->size = sflash->size;
+	mtd->size = b47s->size;
 	mtd->_read = bcm47xxsflash_read;
 
 	/* TODO: implement writing support and verify/change following code */
@@ -40,19 +44,30 @@ static void bcm47xxsflash_fill_mtd(struct bcma_sflash *sflash,
 	mtd->writebufsize = mtd->writesize = 1;
 }
 
-static int bcm47xxsflash_probe(struct platform_device *pdev)
+/**************************************************
+ * BCMA
+ **************************************************/
+
+static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
 {
 	struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
+	struct bcm47xxsflash *b47s;
 	int err;
 
-	sflash->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
-	if (!sflash->mtd) {
+	b47s = kzalloc(sizeof(*b47s), GFP_KERNEL);
+	if (!b47s) {
 		err = -ENOMEM;
 		goto out;
 	}
-	bcm47xxsflash_fill_mtd(sflash, sflash->mtd);
+	sflash->priv = b47s;
 
-	err = mtd_device_parse_register(sflash->mtd, probes, NULL, NULL, 0);
+	b47s->window = sflash->window;
+	b47s->blocksize = sflash->blocksize;
+	b47s->numblocks = sflash->numblocks;
+	b47s->size = sflash->size;
+	bcm47xxsflash_fill_mtd(b47s);
+
+	err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
 	if (err) {
 		pr_err("Failed to register MTD device: %d\n", err);
 		goto err_dev_reg;
@@ -61,34 +76,40 @@ static int bcm47xxsflash_probe(struct platform_device *pdev)
 	return 0;
 
 err_dev_reg:
-	kfree(sflash->mtd);
+	kfree(&b47s->mtd);
 out:
 	return err;
 }
 
-static int bcm47xxsflash_remove(struct platform_device *pdev)
+static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
 {
 	struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
+	struct bcm47xxsflash *b47s = sflash->priv;
 
-	mtd_device_unregister(sflash->mtd);
-	kfree(sflash->mtd);
+	mtd_device_unregister(&b47s->mtd);
+	kfree(b47s);
 
 	return 0;
 }
 
 static struct platform_driver bcma_sflash_driver = {
-	.remove = bcm47xxsflash_remove,
+	.probe	= bcm47xxsflash_bcma_probe,
+	.remove = bcm47xxsflash_bcma_remove,
 	.driver = {
 		.name = "bcma_sflash",
 		.owner = THIS_MODULE,
 	},
 };
 
+/**************************************************
+ * Init
+ **************************************************/
+
 static int __init bcm47xxsflash_init(void)
 {
 	int err;
 
-	err = platform_driver_probe(&bcma_sflash_driver, bcm47xxsflash_probe);
+	err = platform_driver_register(&bcma_sflash_driver);
 	if (err)
 		pr_err("Failed to register BCMA serial flash driver: %d\n",
 		       err);

drivers/mtd/devices/bcm47xxsflash.h

@@ -0,0 +1,15 @@
+#ifndef __BCM47XXSFLASH_H
+#define __BCM47XXSFLASH_H
+
+#include <linux/mtd/mtd.h>
+
+struct bcm47xxsflash {
+	u32 window;
+	u32 blocksize;
+	u16 numblocks;
+	u32 size;
+
+	struct mtd_info mtd;
+};
+
+#endif /* BCM47XXSFLASH */

drivers/mtd/devices/elm.c

@@ -0,0 +1,404 @@
+/*
+ * Error Location Module
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_data/elm.h>
+
+#define ELM_IRQSTATUS			0x018
+#define ELM_IRQENABLE			0x01c
+#define ELM_LOCATION_CONFIG		0x020
+#define ELM_PAGE_CTRL			0x080
+#define ELM_SYNDROME_FRAGMENT_0		0x400
+#define ELM_SYNDROME_FRAGMENT_6		0x418
+#define ELM_LOCATION_STATUS		0x800
+#define ELM_ERROR_LOCATION_0		0x880
+
+/* ELM Interrupt Status Register */
+#define INTR_STATUS_PAGE_VALID		BIT(8)
+
+/* ELM Interrupt Enable Register */
+#define INTR_EN_PAGE_MASK		BIT(8)
+
+/* ELM Location Configuration Register */
+#define ECC_BCH_LEVEL_MASK		0x3
+
+/* ELM syndrome */
+#define ELM_SYNDROME_VALID		BIT(16)
+
+/* ELM_LOCATION_STATUS Register */
+#define ECC_CORRECTABLE_MASK		BIT(8)
+#define ECC_NB_ERRORS_MASK		0x1f
+
+/* ELM_ERROR_LOCATION_0-15 Registers */
+#define ECC_ERROR_LOCATION_MASK		0x1fff
+
+#define ELM_ECC_SIZE			0x7ff
+
+#define SYNDROME_FRAGMENT_REG_SIZE	0x40
+#define ERROR_LOCATION_SIZE		0x100
+
+struct elm_info {
+	struct device *dev;
+	void __iomem *elm_base;
+	struct completion elm_completion;
+	struct list_head list;
+	enum bch_ecc bch_type;
+};
+
+static LIST_HEAD(elm_devices);
+
+static void elm_write_reg(struct elm_info *info, int offset, u32 val)
+{
+	writel(val, info->elm_base + offset);
+}
+
+static u32 elm_read_reg(struct elm_info *info, int offset)
+{
+	return readl(info->elm_base + offset);
+}
+
+/**
+ * elm_config - Configure ELM module
+ * @dev:	ELM device
+ * @bch_type:	Type of BCH ecc
+ */
+void elm_config(struct device *dev, enum bch_ecc bch_type)
+{
+	u32 reg_val;
+	struct elm_info *info = dev_get_drvdata(dev);
+
+	reg_val = (bch_type & ECC_BCH_LEVEL_MASK) | (ELM_ECC_SIZE << 16);
+	elm_write_reg(info, ELM_LOCATION_CONFIG, reg_val);
+	info->bch_type = bch_type;
+}
+EXPORT_SYMBOL(elm_config);
+
+/**
+ * elm_configure_page_mode - Enable/Disable page mode
+ * @info:	elm info
+ * @index:	index number of syndrome fragment vector
+ * @enable:	enable/disable flag for page mode
+ *
+ * Enable page mode for syndrome fragment index
+ */
+static void elm_configure_page_mode(struct elm_info *info, int index,
+		bool enable)
+{
+	u32 reg_val;
+
+	reg_val = elm_read_reg(info, ELM_PAGE_CTRL);
+	if (enable)
+		reg_val |= BIT(index);	/* enable page mode */
+	else
+		reg_val &= ~BIT(index);	/* disable page mode */
+
+	elm_write_reg(info, ELM_PAGE_CTRL, reg_val);
+}
+
+/**
+ * elm_load_syndrome - Load ELM syndrome reg
+ * @info:	elm info
+ * @err_vec:	elm error vectors
+ * @ecc:	buffer with calculated ecc
+ *
+ * Load syndrome fragment registers with calculated ecc in reverse order.
+ */
+static void elm_load_syndrome(struct elm_info *info,
+		struct elm_errorvec *err_vec, u8 *ecc)
+{
+	int i, offset;
+	u32 val;
+
+	for (i = 0; i < ERROR_VECTOR_MAX; i++) {
+
+		/* Check error reported */
+		if (err_vec[i].error_reported) {
+			elm_configure_page_mode(info, i, true);
+			offset = ELM_SYNDROME_FRAGMENT_0 +
+				SYNDROME_FRAGMENT_REG_SIZE * i;
+
+			/* BCH8 */
+			if (info->bch_type) {
+
+				/* syndrome fragment 0 = ecc[9-12B] */
+				val = cpu_to_be32(*(u32 *) &ecc[9]);
+				elm_write_reg(info, offset, val);
+
+				/* syndrome fragment 1 = ecc[5-8B] */
+				offset += 4;
+				val = cpu_to_be32(*(u32 *) &ecc[5]);
+				elm_write_reg(info, offset, val);
+
+				/* syndrome fragment 2 = ecc[1-4B] */
+				offset += 4;
+				val = cpu_to_be32(*(u32 *) &ecc[1]);
+				elm_write_reg(info, offset, val);
+
+				/* syndrome fragment 3 = ecc[0B] */
+				offset += 4;
+				val = ecc[0];
+				elm_write_reg(info, offset, val);
+			} else {
+				/* syndrome fragment 0 = ecc[20-52b] bits */
+				val = (cpu_to_be32(*(u32 *) &ecc[3]) >> 4) |
+					((ecc[2] & 0xf) << 28);
+				elm_write_reg(info, offset, val);
+
+				/* syndrome fragment 1 = ecc[0-20b] bits */
+				offset += 4;
+				val = cpu_to_be32(*(u32 *) &ecc[0]) >> 12;
+				elm_write_reg(info, offset, val);
+			}
+		}
+
+		/* Update ecc pointer with ecc byte size */
+		ecc += info->bch_type ? BCH8_SIZE : BCH4_SIZE;
+	}
+}
+
+/**
+ * elm_start_processing - start elm syndrome processing
+ * @info:	elm info
+ * @err_vec:	elm error vectors
+ *
+ * Set syndrome valid bit for syndrome fragment registers for which
+ * elm syndrome fragment registers are loaded. This enables elm module
+ * to start processing syndrome vectors.
+ */
+static void elm_start_processing(struct elm_info *info,
+		struct elm_errorvec *err_vec)
+{
+	int i, offset;
+	u32 reg_val;
+
+	/*
+	 * Set syndrome vector valid, so that ELM module
+	 * will process it for vectors error is reported
+	 */
+	for (i = 0; i < ERROR_VECTOR_MAX; i++) {
+		if (err_vec[i].error_reported) {
+			offset = ELM_SYNDROME_FRAGMENT_6 +
+				SYNDROME_FRAGMENT_REG_SIZE * i;
+			reg_val = elm_read_reg(info, offset);
+			reg_val |= ELM_SYNDROME_VALID;
+			elm_write_reg(info, offset, reg_val);
+		}
+	}
+}
+
+/**
+ * elm_error_correction - locate correctable error position
+ * @info:	elm info
+ * @err_vec:	elm error vectors
+ *
+ * On completion of processing by elm module, error location status
+ * register updated with correctable/uncorrectable error information.
+ * In case of correctable errors, number of errors located from
+ * elm location status register & read the positions from
+ * elm error location register.
+ */
+static void elm_error_correction(struct elm_info *info,
+		struct elm_errorvec *err_vec)
+{
+	int i, j, errors = 0;
+	int offset;
+	u32 reg_val;
+
+	for (i = 0; i < ERROR_VECTOR_MAX; i++) {
+
+		/* Check error reported */
+		if (err_vec[i].error_reported) {
+			offset = ELM_LOCATION_STATUS + ERROR_LOCATION_SIZE * i;
+			reg_val = elm_read_reg(info, offset);
+
+			/* Check correctable error or not */
+			if (reg_val & ECC_CORRECTABLE_MASK) {
+				offset = ELM_ERROR_LOCATION_0 +
+					ERROR_LOCATION_SIZE * i;
+
+				/* Read count of correctable errors */
+				err_vec[i].error_count = reg_val &
+					ECC_NB_ERRORS_MASK;
+
+				/* Update the error locations in error vector */
+				for (j = 0; j < err_vec[i].error_count; j++) {
+
+					reg_val = elm_read_reg(info, offset);
+					err_vec[i].error_loc[j] = reg_val &
+						ECC_ERROR_LOCATION_MASK;
+
+					/* Update error location register */
+					offset += 4;
+				}
+
+				errors += err_vec[i].error_count;
+			} else {
+				err_vec[i].error_uncorrectable = true;
+			}
+
+			/* Clearing interrupts for processed error vectors */
+			elm_write_reg(info, ELM_IRQSTATUS, BIT(i));
+
+			/* Disable page mode */
+			elm_configure_page_mode(info, i, false);
+		}
+	}
+}
+
+/**
+ * elm_decode_bch_error_page - Locate error position
+ * @dev:	device pointer
+ * @ecc_calc:	calculated ECC bytes from GPMC
+ * @err_vec:	elm error vectors
+ *
+ * Called with one or more error reported vectors & vectors with
+ * error reported is updated in err_vec[].error_reported
+ */
+void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
+		struct elm_errorvec *err_vec)
+{
+	struct elm_info *info = dev_get_drvdata(dev);
+	u32 reg_val;
+
+	/* Enable page mode interrupt */
+	reg_val = elm_read_reg(info, ELM_IRQSTATUS);
+	elm_write_reg(info, ELM_IRQSTATUS, reg_val & INTR_STATUS_PAGE_VALID);
+	elm_write_reg(info, ELM_IRQENABLE, INTR_EN_PAGE_MASK);
+
+	/* Load valid ecc byte to syndrome fragment register */
+	elm_load_syndrome(info, err_vec, ecc_calc);
+
+	/* Enable syndrome processing for which syndrome fragment is updated */
+	elm_start_processing(info, err_vec);
+
+	/* Wait for ELM module to finish locating error correction */
+	wait_for_completion(&info->elm_completion);
+
+	/* Disable page mode interrupt */
+	reg_val = elm_read_reg(info, ELM_IRQENABLE);
+	elm_write_reg(info, ELM_IRQENABLE, reg_val & ~INTR_EN_PAGE_MASK);
+	elm_error_correction(info, err_vec);
+}
+EXPORT_SYMBOL(elm_decode_bch_error_page);
+
+static irqreturn_t elm_isr(int this_irq, void *dev_id)
+{
+	u32 reg_val;
+	struct elm_info *info = dev_id;
+
+	reg_val = elm_read_reg(info, ELM_IRQSTATUS);
+
+	/* All error vectors processed */
+	if (reg_val & INTR_STATUS_PAGE_VALID) {
+		elm_write_reg(info, ELM_IRQSTATUS,
+				reg_val & INTR_STATUS_PAGE_VALID);
+		complete(&info->elm_completion);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static int elm_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct resource *res, *irq;
+	struct elm_info *info;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		dev_err(&pdev->dev, "failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	info->dev = &pdev->dev;
+
+	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!irq) {
+		dev_err(&pdev->dev, "no irq resource defined\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "no memory resource defined\n");
+		return -ENODEV;
+	}
+
+	info->elm_base = devm_request_and_ioremap(&pdev->dev, res);
+	if (!info->elm_base)
+		return -EADDRNOTAVAIL;
+
+	ret = devm_request_irq(&pdev->dev, irq->start, elm_isr, 0,
+			pdev->name, info);
+	if (ret) {
+		dev_err(&pdev->dev, "failure requesting irq %i\n", irq->start);
+		return ret;
+	}
+
+	pm_runtime_enable(&pdev->dev);
+	if (pm_runtime_get_sync(&pdev->dev)) {
+		ret = -EINVAL;
+		pm_runtime_disable(&pdev->dev);
+		dev_err(&pdev->dev, "can't enable clock\n");
+		return ret;
+	}
+
+	init_completion(&info->elm_completion);
+	INIT_LIST_HEAD(&info->list);
+	list_add(&info->list, &elm_devices);
+	platform_set_drvdata(pdev, info);
+	return ret;
+}
+
+static int elm_remove(struct platform_device *pdev)
+{
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	platform_set_drvdata(pdev, NULL);
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id elm_of_match[] = {
+	{ .compatible = "ti,am3352-elm" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, elm_of_match);
+#endif
+
+static struct platform_driver elm_driver = {
+	.driver	= {
+		.name	= "elm",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(elm_of_match),
+	},
+	.probe	= elm_probe,
+	.remove	= elm_remove,
+};
+
+module_platform_driver(elm_driver);
+
+MODULE_DESCRIPTION("ELM driver for BCH error correction");
+MODULE_AUTHOR("Texas Instruments");
+MODULE_ALIAS("platform: elm");
+MODULE_LICENSE("GPL v2");

drivers/mtd/devices/m25p80.c

@@ -565,6 +565,96 @@ time_out:
 	return ret;
 }
 
+static int m25p80_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+	struct m25p *flash = mtd_to_m25p(mtd);
+	uint32_t offset = ofs;
+	uint8_t status_old, status_new;
+	int res = 0;
+
+	mutex_lock(&flash->lock);
+	/* Wait until finished previous command */
+	if (wait_till_ready(flash)) {
+		res = 1;
+		goto err;
+	}
+
+	status_old = read_sr(flash);
+
+	if (offset < flash->mtd.size-(flash->mtd.size/2))
+		status_new = status_old | SR_BP2 | SR_BP1 | SR_BP0;
+	else if (offset < flash->mtd.size-(flash->mtd.size/4))
+		status_new = (status_old & ~SR_BP0) | SR_BP2 | SR_BP1;
+	else if (offset < flash->mtd.size-(flash->mtd.size/8))
+		status_new = (status_old & ~SR_BP1) | SR_BP2 | SR_BP0;
+	else if (offset < flash->mtd.size-(flash->mtd.size/16))
+		status_new = (status_old & ~(SR_BP0|SR_BP1)) | SR_BP2;
+	else if (offset < flash->mtd.size-(flash->mtd.size/32))
+		status_new = (status_old & ~SR_BP2) | SR_BP1 | SR_BP0;
+	else if (offset < flash->mtd.size-(flash->mtd.size/64))
+		status_new = (status_old & ~(SR_BP2|SR_BP0)) | SR_BP1;
+	else
+		status_new = (status_old & ~(SR_BP2|SR_BP1)) | SR_BP0;
+
+	/* Only modify protection if it will not unlock other areas */
+	if ((status_new&(SR_BP2|SR_BP1|SR_BP0)) >
+					(status_old&(SR_BP2|SR_BP1|SR_BP0))) {
+		write_enable(flash);
+		if (write_sr(flash, status_new) < 0) {
+			res = 1;
+			goto err;
+		}
+	}
+
+err:	mutex_unlock(&flash->lock);
+	return res;
+}
+
+static int m25p80_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+	struct m25p *flash = mtd_to_m25p(mtd);
+	uint32_t offset = ofs;
+	uint8_t status_old, status_new;
+	int res = 0;
+
+	mutex_lock(&flash->lock);
+	/* Wait until finished previous command */
+	if (wait_till_ready(flash)) {
+		res = 1;
+		goto err;
+	}
+
+	status_old = read_sr(flash);
+
+	if (offset+len > flash->mtd.size-(flash->mtd.size/64))
+		status_new = status_old & ~(SR_BP2|SR_BP1|SR_BP0);
+	else if (offset+len > flash->mtd.size-(flash->mtd.size/32))
+		status_new = (status_old & ~(SR_BP2|SR_BP1)) | SR_BP0;
+	else if (offset+len > flash->mtd.size-(flash->mtd.size/16))
+		status_new = (status_old & ~(SR_BP2|SR_BP0)) | SR_BP1;
+	else if (offset+len > flash->mtd.size-(flash->mtd.size/8))
+		status_new = (status_old & ~SR_BP2) | SR_BP1 | SR_BP0;
+	else if (offset+len > flash->mtd.size-(flash->mtd.size/4))
+		status_new = (status_old & ~(SR_BP0|SR_BP1)) | SR_BP2;
+	else if (offset+len > flash->mtd.size-(flash->mtd.size/2))
+		status_new = (status_old & ~SR_BP1) | SR_BP2 | SR_BP0;
+	else
+		status_new = (status_old & ~SR_BP0) | SR_BP2 | SR_BP1;
+
+	/* Only modify protection if it will not lock other areas */
+	if ((status_new&(SR_BP2|SR_BP1|SR_BP0)) <
+					(status_old&(SR_BP2|SR_BP1|SR_BP0))) {
+		write_enable(flash);
+		if (write_sr(flash, status_new) < 0) {
+			res = 1;
+			goto err;
+		}
+	}
+
+err:	mutex_unlock(&flash->lock);
+	return res;
+}
+
 /****************************************************************************/
 
 /*
@@ -642,6 +732,10 @@ static const struct spi_device_id m25p_ids[] = {
 	/* Everspin */
 	{ "mr25h256", CAT25_INFO(  32 * 1024, 1, 256, 2) },
 
+	/* GigaDevice */
+	{ "gd25q32", INFO(0xc84016, 0, 64 * 1024,  64, SECT_4K) },
+	{ "gd25q64", INFO(0xc84017, 0, 64 * 1024, 128, SECT_4K) },
+
 	/* Intel/Numonyx -- xxxs33b */
 	{ "160s33b",  INFO(0x898911, 0, 64 * 1024,  32, 0) },
 	{ "320s33b",  INFO(0x898912, 0, 64 * 1024,  64, 0) },
@@ -899,6 +993,12 @@ static int m25p_probe(struct spi_device *spi)
 	flash->mtd._erase = m25p80_erase;
 	flash->mtd._read = m25p80_read;
 
+	/* flash protection support for STmicro chips */
+	if (JEDEC_MFR(info->jedec_id) == CFI_MFR_ST) {
+		flash->mtd._lock = m25p80_lock;
+		flash->mtd._unlock = m25p80_unlock;
+	}
+
 	/* sst flash chips use AAI word program */
 	if (JEDEC_MFR(info->jedec_id) == CFI_MFR_SST)
 		flash->mtd._write = sst_write;

drivers/mtd/maps/Kconfig

@@ -429,7 +429,7 @@ config MTD_GPIO_ADDR
 
 config MTD_UCLINUX
 	bool "Generic uClinux RAM/ROM filesystem support"
-	depends on MTD_RAM=y && (!MMU || COLDFIRE)
+	depends on (MTD_RAM=y || MTD_ROM=y) && (!MMU || COLDFIRE)
 	help
 	  Map driver to support image based filesystems for uClinux.
 

drivers/mtd/maps/physmap_of.c

@@ -68,9 +68,6 @@ static int of_flash_remove(struct platform_device *dev)
 			kfree(info->list[i].res);
 		}
 	}
-
-	kfree(info);
-
 	return 0;
 }
 
@@ -199,8 +196,9 @@ static int of_flash_probe(struct platform_device *dev)
 	map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access");
 
 	err = -ENOMEM;
-	info = kzalloc(sizeof(struct of_flash) +
-		       sizeof(struct of_flash_list) * count, GFP_KERNEL);
+	info = devm_kzalloc(&dev->dev,
+			    sizeof(struct of_flash) +
+			    sizeof(struct of_flash_list) * count, GFP_KERNEL);
 	if (!info)
 		goto err_flash_remove;
 
@@ -241,6 +239,7 @@ static int of_flash_probe(struct platform_device *dev)
 		info->list[i].map.phys = res.start;
 		info->list[i].map.size = res_size;
 		info->list[i].map.bankwidth = be32_to_cpup(width);
+		info->list[i].map.device_node = dp;
 
 		err = -ENOMEM;
 		info->list[i].map.virt = ioremap(info->list[i].map.phys,

drivers/mtd/maps/uclinux.c

@@ -23,12 +23,26 @@
 
 /****************************************************************************/
 
+#ifdef CONFIG_MTD_ROM
+#define MAP_NAME "rom"
+#else
+#define MAP_NAME "ram"
+#endif
+
+/*
+ * Blackfin uses uclinux_ram_map during startup, so it must not be static.
+ * Provide a dummy declaration to make sparse happy.
+ */
+extern struct map_info uclinux_ram_map;
+
 struct map_info uclinux_ram_map = {
-	.name = "RAM",
-	.phys = (unsigned long)__bss_stop,
+	.name = MAP_NAME,
 	.size = 0,
 };
 
+static unsigned long physaddr = -1;
+module_param(physaddr, ulong, S_IRUGO);
+
 static struct mtd_info *uclinux_ram_mtdinfo;
 
 /****************************************************************************/
@@ -60,11 +74,17 @@ static int __init uclinux_mtd_init(void)
 	struct map_info *mapp;
 
 	mapp = &uclinux_ram_map;
+
+	if (physaddr == -1)
+		mapp->phys = (resource_size_t)__bss_stop;
+	else
+		mapp->phys = physaddr;
+
 	if (!mapp->size)
 		mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
 	mapp->bankwidth = 4;
 
-	printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
+	printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
 	       	(int) mapp->phys, (int) mapp->size);
 
 	/*
@@ -82,7 +102,7 @@ static int __init uclinux_mtd_init(void)
 
 	simple_map_init(mapp);
 
-	mtd = do_map_probe("map_ram", mapp);
+	mtd = do_map_probe("map_" MAP_NAME, mapp);
 	if (!mtd) {
 		printk("uclinux[mtd]: failed to find a mapping?\n");
 		return(-ENXIO);
@@ -118,6 +138,6 @@ module_exit(uclinux_mtd_cleanup);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
-MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
+MODULE_DESCRIPTION("Generic MTD for uClinux");
 
 /****************************************************************************/

drivers/mtd/nand/atmel_nand.c

@@ -101,6 +101,8 @@ struct atmel_nand_host {
 	u8			pmecc_corr_cap;
 	u16			pmecc_sector_size;
 	u32			pmecc_lookup_table_offset;
+	u32			pmecc_lookup_table_offset_512;
+	u32			pmecc_lookup_table_offset_1024;
 
 	int			pmecc_bytes_per_sector;
 	int			pmecc_sector_number;
@@ -908,6 +910,84 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
 }
 
+/*
+ * Get ECC requirement in ONFI parameters, returns -1 if ONFI
+ * parameters is not supported.
+ * return 0 if success to get the ECC requirement.
+ */
+static int get_onfi_ecc_param(struct nand_chip *chip,
+		int *ecc_bits, int *sector_size)
+{
+	*ecc_bits = *sector_size = 0;
+
+	if (chip->onfi_params.ecc_bits == 0xff)
+		/* TODO: the sector_size and ecc_bits need to be find in
+		 * extended ecc parameter, currently we don't support it.
+		 */
+		return -1;
+
+	*ecc_bits = chip->onfi_params.ecc_bits;
+
+	/* The default sector size (ecc codeword size) is 512 */
+	*sector_size = 512;
+
+	return 0;
+}
+
+/*
+ * Get ecc requirement from ONFI parameters ecc requirement.
+ * If pmecc-cap, pmecc-sector-size in DTS are not specified, this function
+ * will set them according to ONFI ecc requirement. Otherwise, use the
+ * value in DTS file.
+ * return 0 if success. otherwise return error code.
+ */
+static int pmecc_choose_ecc(struct atmel_nand_host *host,
+		int *cap, int *sector_size)
+{
+	/* Get ECC requirement from ONFI parameters */
+	*cap = *sector_size = 0;
+	if (host->nand_chip.onfi_version) {
+		if (!get_onfi_ecc_param(&host->nand_chip, cap, sector_size))
+			dev_info(host->dev, "ONFI params, minimum required ECC: %d bits in %d bytes\n",
+				*cap, *sector_size);
+		else
+			dev_info(host->dev, "NAND chip ECC reqirement is in Extended ONFI parameter, we don't support yet.\n");
+	} else {
+		dev_info(host->dev, "NAND chip is not ONFI compliant, assume ecc_bits is 2 in 512 bytes");
+	}
+	if (*cap == 0 && *sector_size == 0) {
+		*cap = 2;
+		*sector_size = 512;
+	}
+
+	/* If dts file doesn't specify then use the one in ONFI parameters */
+	if (host->pmecc_corr_cap == 0) {
+		/* use the most fitable ecc bits (the near bigger one ) */
+		if (*cap <= 2)
+			host->pmecc_corr_cap = 2;
+		else if (*cap <= 4)
+			host->pmecc_corr_cap = 4;
+		else if (*cap < 8)
+			host->pmecc_corr_cap = 8;
+		else if (*cap < 12)
+			host->pmecc_corr_cap = 12;
+		else if (*cap < 24)
+			host->pmecc_corr_cap = 24;
+		else
+			return -EINVAL;
+	}
+	if (host->pmecc_sector_size == 0) {
+		/* use the most fitable sector size (the near smaller one ) */
+		if (*sector_size >= 1024)
+			host->pmecc_sector_size = 1024;
+		else if (*sector_size >= 512)
+			host->pmecc_sector_size = 512;
+		else
+			return -EINVAL;
+	}
+	return 0;
+}
+
 static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev,
 					 struct atmel_nand_host *host)
 {
@@ -916,8 +996,22 @@ static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev,
 	struct resource *regs, *regs_pmerr, *regs_rom;
 	int cap, sector_size, err_no;
 
+	err_no = pmecc_choose_ecc(host, &cap, &sector_size);
+	if (err_no) {
+		dev_err(host->dev, "The NAND flash's ECC requirement are not support!");
+		return err_no;
+	}
+
+	if (cap != host->pmecc_corr_cap ||
+			sector_size != host->pmecc_sector_size)
+		dev_info(host->dev, "WARNING: Be Caution! Using different PMECC parameters from Nand ONFI ECC reqirement.\n");
+
 	cap = host->pmecc_corr_cap;
 	sector_size = host->pmecc_sector_size;
+	host->pmecc_lookup_table_offset = (sector_size == 512) ?
+			host->pmecc_lookup_table_offset_512 :
+			host->pmecc_lookup_table_offset_1024;
+
 	dev_info(host->dev, "Initialize PMECC params, cap: %d, sector: %d\n",
 		 cap, sector_size);
 
@@ -1215,7 +1309,7 @@ static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
 static int atmel_of_init_port(struct atmel_nand_host *host,
 			      struct device_node *np)
 {
-	u32 val, table_offset;
+	u32 val;
 	u32 offset[2];
 	int ecc_mode;
 	struct atmel_nand_data *board = &host->board;
@@ -1259,42 +1353,41 @@ static int atmel_of_init_port(struct atmel_nand_host *host,
 
 	/* use PMECC, get correction capability, sector size and lookup
 	 * table offset.
+	 * If correction bits and sector size are not specified, then find
+	 * them from NAND ONFI parameters.
 	 */
-	if (of_property_read_u32(np, "atmel,pmecc-cap", &val) != 0) {
-		dev_err(host->dev, "Cannot decide PMECC Capability\n");
-		return -EINVAL;
-	} else if ((val != 2) && (val != 4) && (val != 8) && (val != 12) &&
-	    (val != 24)) {
-		dev_err(host->dev,
-			"Unsupported PMECC correction capability: %d; should be 2, 4, 8, 12 or 24\n",
-			val);
-		return -EINVAL;
+	if (of_property_read_u32(np, "atmel,pmecc-cap", &val) == 0) {
+		if ((val != 2) && (val != 4) && (val != 8) && (val != 12) &&
+				(val != 24)) {
+			dev_err(host->dev,
+				"Unsupported PMECC correction capability: %d; should be 2, 4, 8, 12 or 24\n",
+				val);
+			return -EINVAL;
+		}
+		host->pmecc_corr_cap = (u8)val;
 	}
-	host->pmecc_corr_cap = (u8)val;
 
-	if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) != 0) {
-		dev_err(host->dev, "Cannot decide PMECC Sector Size\n");
-		return -EINVAL;
-	} else if ((val != 512) && (val != 1024)) {
-		dev_err(host->dev,
-			"Unsupported PMECC sector size: %d; should be 512 or 1024 bytes\n",
-			val);
-		return -EINVAL;
+	if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) == 0) {
+		if ((val != 512) && (val != 1024)) {
+			dev_err(host->dev,
+				"Unsupported PMECC sector size: %d; should be 512 or 1024 bytes\n",
+				val);
+			return -EINVAL;
+		}
+		host->pmecc_sector_size = (u16)val;
 	}
-	host->pmecc_sector_size = (u16)val;
 
 	if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset",
 			offset, 2) != 0) {
 		dev_err(host->dev, "Cannot get PMECC lookup table offset\n");
 		return -EINVAL;
 	}
-	table_offset = host->pmecc_sector_size == 512 ? offset[0] : offset[1];
-
-	if (!table_offset) {
+	if (!offset[0] && !offset[1]) {
 		dev_err(host->dev, "Invalid PMECC lookup table offset\n");
 		return -EINVAL;
 	}
-	host->pmecc_lookup_table_offset = table_offset;
+	host->pmecc_lookup_table_offset_512 = offset[0];
+	host->pmecc_lookup_table_offset_1024 = offset[1];
 
 	return 0;
 }

drivers/mtd/nand/bcm47xxnflash/bcm47xxnflash.h

@@ -1,6 +1,10 @@
 #ifndef __BCM47XXNFLASH_H
 #define __BCM47XXNFLASH_H
 
+#ifndef pr_fmt
+#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
+#endif
+
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 

drivers/mtd/nand/bcm47xxnflash/main.c

@@ -9,14 +9,14 @@
  *
  */
 
+#include "bcm47xxnflash.h"
+
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/bcma/bcma.h>
 
-#include "bcm47xxnflash.h"
-
 MODULE_DESCRIPTION("NAND flash driver for BCMA bus");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Rafał Miłecki");
@@ -77,6 +77,7 @@ static int bcm47xxnflash_remove(struct platform_device *pdev)
 }
 
 static struct platform_driver bcm47xxnflash_driver = {
+	.probe	= bcm47xxnflash_probe,
 	.remove = bcm47xxnflash_remove,
 	.driver = {
 		.name = "bcma_nflash",
@@ -88,13 +89,10 @@ static int __init bcm47xxnflash_init(void)
 {
 	int err;
 
-	/*
-	 * Platform device "bcma_nflash" exists on SoCs and is registered very
-	 * early, it won't be added during runtime (use platform_driver_probe).
-	 */
-	err = platform_driver_probe(&bcm47xxnflash_driver, bcm47xxnflash_probe);
+	err = platform_driver_register(&bcm47xxnflash_driver);
 	if (err)
-		pr_err("Failed to register serial flash driver: %d\n", err);
+		pr_err("Failed to register bcm47xx nand flash driver: %d\n",
+		       err);
 
 	return err;
 }

drivers/mtd/nand/bcm47xxnflash/ops_bcm4706.c

@@ -9,13 +9,13 @@
  *
  */
 
+#include "bcm47xxnflash.h"
+
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/bcma/bcma.h>
 
-#include "bcm47xxnflash.h"
-
 /* Broadcom uses 1'000'000 but it seems to be too many. Tests on WNDR4500 has
  * shown ~1000 retries as maxiumum. */
 #define NFLASH_READY_RETRIES		10000

drivers/mtd/nand/davinci_nand.c

@@ -606,7 +606,7 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
 	if (pdev->id < 0 || pdev->id > 3)
 		return -ENODEV;
 
-	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		dev_err(&pdev->dev, "unable to allocate memory\n");
 		ret = -ENOMEM;
@@ -623,11 +623,11 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
 		goto err_nomem;
 	}
 
-	vaddr = ioremap(res1->start, resource_size(res1));
-	base = ioremap(res2->start, resource_size(res2));
+	vaddr = devm_request_and_ioremap(&pdev->dev, res1);
+	base = devm_request_and_ioremap(&pdev->dev, res2);
 	if (!vaddr || !base) {
 		dev_err(&pdev->dev, "ioremap failed\n");
-		ret = -EINVAL;
+		ret = -EADDRNOTAVAIL;
 		goto err_ioremap;
 	}
 
@@ -717,7 +717,7 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
 	}
 	info->chip.ecc.mode = ecc_mode;
 
-	info->clk = clk_get(&pdev->dev, "aemif");
+	info->clk = devm_clk_get(&pdev->dev, "aemif");
 	if (IS_ERR(info->clk)) {
 		ret = PTR_ERR(info->clk);
 		dev_dbg(&pdev->dev, "unable to get AEMIF clock, err %d\n", ret);
@@ -845,8 +845,6 @@ err_timing:
 	clk_disable_unprepare(info->clk);
 
 err_clk_enable:
-	clk_put(info->clk);
-
 	spin_lock_irq(&davinci_nand_lock);
 	if (ecc_mode == NAND_ECC_HW_SYNDROME)
 		ecc4_busy = false;
@@ -855,13 +853,7 @@ err_clk_enable:
 err_ecc:
 err_clk:
 err_ioremap:
-	if (base)
-		iounmap(base);
-	if (vaddr)
-		iounmap(vaddr);
-
 err_nomem:
-	kfree(info);
 	return ret;
 }
 
@@ -874,15 +866,9 @@ static int __exit nand_davinci_remove(struct platform_device *pdev)
 		ecc4_busy = false;
 	spin_unlock_irq(&davinci_nand_lock);
 
-	iounmap(info->base);
-	iounmap(info->vaddr);
-
 	nand_release(&info->mtd);
 
 	clk_disable_unprepare(info->clk);
-	clk_put(info->clk);
-
-	kfree(info);
 
 	return 0;
 }

drivers/mtd/nand/fsl_ifc_nand.c

@@ -176,8 +176,8 @@ static void set_addr(struct mtd_info *mtd, int column, int page_addr, int oob)
 
 	ifc_nand_ctrl->page = page_addr;
 	/* Program ROW0/COL0 */
-	out_be32(&ifc->ifc_nand.row0, page_addr);
-	out_be32(&ifc->ifc_nand.col0, (oob ? IFC_NAND_COL_MS : 0) | column);
+	iowrite32be(page_addr, &ifc->ifc_nand.row0);
+	iowrite32be((oob ? IFC_NAND_COL_MS : 0) | column, &ifc->ifc_nand.col0);
 
 	buf_num = page_addr & priv->bufnum_mask;
 
@@ -239,18 +239,19 @@ static void fsl_ifc_run_command(struct mtd_info *mtd)
 	int i;
 
 	/* set the chip select for NAND Transaction */
-	out_be32(&ifc->ifc_nand.nand_csel, priv->bank << IFC_NAND_CSEL_SHIFT);
+	iowrite32be(priv->bank << IFC_NAND_CSEL_SHIFT,
+		    &ifc->ifc_nand.nand_csel);
 
 	dev_vdbg(priv->dev,
 			"%s: fir0=%08x fcr0=%08x\n",
 			__func__,
-			in_be32(&ifc->ifc_nand.nand_fir0),
-			in_be32(&ifc->ifc_nand.nand_fcr0));
+			ioread32be(&ifc->ifc_nand.nand_fir0),
+			ioread32be(&ifc->ifc_nand.nand_fcr0));
 
 	ctrl->nand_stat = 0;
 
 	/* start read/write seq */
-	out_be32(&ifc->ifc_nand.nandseq_strt, IFC_NAND_SEQ_STRT_FIR_STRT);
+	iowrite32be(IFC_NAND_SEQ_STRT_FIR_STRT, &ifc->ifc_nand.nandseq_strt);
 
 	/* wait for command complete flag or timeout */
 	wait_event_timeout(ctrl->nand_wait, ctrl->nand_stat,
@@ -273,7 +274,7 @@ static void fsl_ifc_run_command(struct mtd_info *mtd)
 		int sector_end = sector + chip->ecc.steps - 1;
 
 		for (i = sector / 4; i <= sector_end / 4; i++)
-			eccstat[i] = in_be32(&ifc->ifc_nand.nand_eccstat[i]);
+			eccstat[i] = ioread32be(&ifc->ifc_nand.nand_eccstat[i]);
 
 		for (i = sector; i <= sector_end; i++) {
 			errors = check_read_ecc(mtd, ctrl, eccstat, i);
@@ -313,31 +314,33 @@ static void fsl_ifc_do_read(struct nand_chip *chip,
 
 	/* Program FIR/IFC_NAND_FCR0 for Small/Large page */
 	if (mtd->writesize > 512) {
-		out_be32(&ifc->ifc_nand.nand_fir0,
-			 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-			 (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
-			 (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
-			 (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP3_SHIFT) |
-			 (IFC_FIR_OP_RBCD << IFC_NAND_FIR0_OP4_SHIFT));
-		out_be32(&ifc->ifc_nand.nand_fir1, 0x0);
-
-		out_be32(&ifc->ifc_nand.nand_fcr0,
-			(NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT) |
-			(NAND_CMD_READSTART << IFC_NAND_FCR0_CMD1_SHIFT));
+		iowrite32be((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+			    (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
+			    (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
+			    (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP3_SHIFT) |
+			    (IFC_FIR_OP_RBCD << IFC_NAND_FIR0_OP4_SHIFT),
+			    &ifc->ifc_nand.nand_fir0);
+		iowrite32be(0x0, &ifc->ifc_nand.nand_fir1);
+
+		iowrite32be((NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT) |
+			    (NAND_CMD_READSTART << IFC_NAND_FCR0_CMD1_SHIFT),
+			    &ifc->ifc_nand.nand_fcr0);
 	} else {
-		out_be32(&ifc->ifc_nand.nand_fir0,
-			 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-			 (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
-			 (IFC_FIR_OP_RA0  << IFC_NAND_FIR0_OP2_SHIFT) |
-			 (IFC_FIR_OP_RBCD << IFC_NAND_FIR0_OP3_SHIFT));
-		out_be32(&ifc->ifc_nand.nand_fir1, 0x0);
+		iowrite32be((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+			    (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
+			    (IFC_FIR_OP_RA0  << IFC_NAND_FIR0_OP2_SHIFT) |
+			    (IFC_FIR_OP_RBCD << IFC_NAND_FIR0_OP3_SHIFT),
+			    &ifc->ifc_nand.nand_fir0);
+		iowrite32be(0x0, &ifc->ifc_nand.nand_fir1);
 
 		if (oob)
-			out_be32(&ifc->ifc_nand.nand_fcr0,
-				 NAND_CMD_READOOB << IFC_NAND_FCR0_CMD0_SHIFT);
+			iowrite32be(NAND_CMD_READOOB <<
+				    IFC_NAND_FCR0_CMD0_SHIFT,
+				    &ifc->ifc_nand.nand_fcr0);
 		else
-			out_be32(&ifc->ifc_nand.nand_fcr0,
-				NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT);
+			iowrite32be(NAND_CMD_READ0 <<
+				    IFC_NAND_FCR0_CMD0_SHIFT,
+				    &ifc->ifc_nand.nand_fcr0);
 	}
 }
 
@@ -357,7 +360,7 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 	switch (command) {
 	/* READ0 read the entire buffer to use hardware ECC. */
 	case NAND_CMD_READ0:
-		out_be32(&ifc->ifc_nand.nand_fbcr, 0);
+		iowrite32be(0, &ifc->ifc_nand.nand_fbcr);
 		set_addr(mtd, 0, page_addr, 0);
 
 		ifc_nand_ctrl->read_bytes = mtd->writesize + mtd->oobsize;
@@ -372,7 +375,7 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 
 	/* READOOB reads only the OOB because no ECC is performed. */
 	case NAND_CMD_READOOB:
-		out_be32(&ifc->ifc_nand.nand_fbcr, mtd->oobsize - column);
+		iowrite32be(mtd->oobsize - column, &ifc->ifc_nand.nand_fbcr);
 		set_addr(mtd, column, page_addr, 1);
 
 		ifc_nand_ctrl->read_bytes = mtd->writesize + mtd->oobsize;
@@ -388,19 +391,19 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 		if (command == NAND_CMD_PARAM)
 			timing = IFC_FIR_OP_RBCD;
 
-		out_be32(&ifc->ifc_nand.nand_fir0,
-				(IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-				(IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
-				(timing << IFC_NAND_FIR0_OP2_SHIFT));
-		out_be32(&ifc->ifc_nand.nand_fcr0,
-				command << IFC_NAND_FCR0_CMD0_SHIFT);
-		out_be32(&ifc->ifc_nand.row3, column);
+		iowrite32be((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+			    (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
+			    (timing << IFC_NAND_FIR0_OP2_SHIFT),
+			    &ifc->ifc_nand.nand_fir0);
+		iowrite32be(command << IFC_NAND_FCR0_CMD0_SHIFT,
+			    &ifc->ifc_nand.nand_fcr0);
+		iowrite32be(column, &ifc->ifc_nand.row3);
 
 		/*
 		 * although currently it's 8 bytes for READID, we always read
 		 * the maximum 256 bytes(for PARAM)
 		 */
-		out_be32(&ifc->ifc_nand.nand_fbcr, 256);
+		iowrite32be(256, &ifc->ifc_nand.nand_fbcr);
 		ifc_nand_ctrl->read_bytes = 256;
 
 		set_addr(mtd, 0, 0, 0);
@@ -415,16 +418,16 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 
 	/* ERASE2 uses the block and page address from ERASE1 */
 	case NAND_CMD_ERASE2:
-		out_be32(&ifc->ifc_nand.nand_fir0,
-			 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-			 (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP1_SHIFT) |
-			 (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP2_SHIFT));
+		iowrite32be((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+			    (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP1_SHIFT) |
+			    (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP2_SHIFT),
+			    &ifc->ifc_nand.nand_fir0);
 
-		out_be32(&ifc->ifc_nand.nand_fcr0,
-			 (NAND_CMD_ERASE1 << IFC_NAND_FCR0_CMD0_SHIFT) |
-			 (NAND_CMD_ERASE2 << IFC_NAND_FCR0_CMD1_SHIFT));
+		iowrite32be((NAND_CMD_ERASE1 << IFC_NAND_FCR0_CMD0_SHIFT) |
+			    (NAND_CMD_ERASE2 << IFC_NAND_FCR0_CMD1_SHIFT),
+			    &ifc->ifc_nand.nand_fcr0);
 
-		out_be32(&ifc->ifc_nand.nand_fbcr, 0);
+		iowrite32be(0, &ifc->ifc_nand.nand_fbcr);
 		ifc_nand_ctrl->read_bytes = 0;
 		fsl_ifc_run_command(mtd);
 		return;
@@ -440,26 +443,28 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 				(NAND_CMD_SEQIN << IFC_NAND_FCR0_CMD0_SHIFT) |
 				(NAND_CMD_PAGEPROG << IFC_NAND_FCR0_CMD1_SHIFT);
 
-			out_be32(&ifc->ifc_nand.nand_fir0,
-				 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-				 (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
-				 (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
-				 (IFC_FIR_OP_WBCD  << IFC_NAND_FIR0_OP3_SHIFT) |
-				 (IFC_FIR_OP_CW1 << IFC_NAND_FIR0_OP4_SHIFT));
+			iowrite32be(
+				(IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+				(IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
+				(IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
+				(IFC_FIR_OP_WBCD << IFC_NAND_FIR0_OP3_SHIFT) |
+				(IFC_FIR_OP_CW1 << IFC_NAND_FIR0_OP4_SHIFT),
+				&ifc->ifc_nand.nand_fir0);
 		} else {
 			nand_fcr0 = ((NAND_CMD_PAGEPROG <<
 					IFC_NAND_FCR0_CMD1_SHIFT) |
 				    (NAND_CMD_SEQIN <<
 					IFC_NAND_FCR0_CMD2_SHIFT));
 
-			out_be32(&ifc->ifc_nand.nand_fir0,
-				 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-				 (IFC_FIR_OP_CMD2 << IFC_NAND_FIR0_OP1_SHIFT) |
-				 (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP2_SHIFT) |
-				 (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP3_SHIFT) |
-				 (IFC_FIR_OP_WBCD << IFC_NAND_FIR0_OP4_SHIFT));
-			out_be32(&ifc->ifc_nand.nand_fir1,
-				 (IFC_FIR_OP_CW1 << IFC_NAND_FIR1_OP5_SHIFT));
+			iowrite32be(
+				(IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+				(IFC_FIR_OP_CMD2 << IFC_NAND_FIR0_OP1_SHIFT) |
+				(IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP2_SHIFT) |
+				(IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP3_SHIFT) |
+				(IFC_FIR_OP_WBCD << IFC_NAND_FIR0_OP4_SHIFT),
+				&ifc->ifc_nand.nand_fir0);
+			iowrite32be(IFC_FIR_OP_CW1 << IFC_NAND_FIR1_OP5_SHIFT,
+				    &ifc->ifc_nand.nand_fir1);
 
 			if (column >= mtd->writesize)
 				nand_fcr0 |=
@@ -474,7 +479,7 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 			column -= mtd->writesize;
 			ifc_nand_ctrl->oob = 1;
 		}
-		out_be32(&ifc->ifc_nand.nand_fcr0, nand_fcr0);
+		iowrite32be(nand_fcr0, &ifc->ifc_nand.nand_fcr0);
 		set_addr(mtd, column, page_addr, ifc_nand_ctrl->oob);
 		return;
 	}
@@ -482,10 +487,11 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 	/* PAGEPROG reuses all of the setup from SEQIN and adds the length */
 	case NAND_CMD_PAGEPROG: {
 		if (ifc_nand_ctrl->oob) {
-			out_be32(&ifc->ifc_nand.nand_fbcr,
-				ifc_nand_ctrl->index - ifc_nand_ctrl->column);
+			iowrite32be(ifc_nand_ctrl->index -
+				    ifc_nand_ctrl->column,
+				    &ifc->ifc_nand.nand_fbcr);
 		} else {
-			out_be32(&ifc->ifc_nand.nand_fbcr, 0);
+			iowrite32be(0, &ifc->ifc_nand.nand_fbcr);
 		}
 
 		fsl_ifc_run_command(mtd);
@@ -493,12 +499,12 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 	}
 
 	case NAND_CMD_STATUS:
-		out_be32(&ifc->ifc_nand.nand_fir0,
-				(IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-				(IFC_FIR_OP_RB << IFC_NAND_FIR0_OP1_SHIFT));
-		out_be32(&ifc->ifc_nand.nand_fcr0,
-				NAND_CMD_STATUS << IFC_NAND_FCR0_CMD0_SHIFT);
-		out_be32(&ifc->ifc_nand.nand_fbcr, 1);
+		iowrite32be((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+			    (IFC_FIR_OP_RB << IFC_NAND_FIR0_OP1_SHIFT),
+			    &ifc->ifc_nand.nand_fir0);
+		iowrite32be(NAND_CMD_STATUS << IFC_NAND_FCR0_CMD0_SHIFT,
+			    &ifc->ifc_nand.nand_fcr0);
+		iowrite32be(1, &ifc->ifc_nand.nand_fbcr);
 		set_addr(mtd, 0, 0, 0);
 		ifc_nand_ctrl->read_bytes = 1;
 
@@ -512,10 +518,10 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 		return;
 
 	case NAND_CMD_RESET:
-		out_be32(&ifc->ifc_nand.nand_fir0,
-				IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT);
-		out_be32(&ifc->ifc_nand.nand_fcr0,
-				NAND_CMD_RESET << IFC_NAND_FCR0_CMD0_SHIFT);
+		iowrite32be(IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT,
+			    &ifc->ifc_nand.nand_fir0);
+		iowrite32be(NAND_CMD_RESET << IFC_NAND_FCR0_CMD0_SHIFT,
+			    &ifc->ifc_nand.nand_fcr0);
 		fsl_ifc_run_command(mtd);
 		return;
 
@@ -639,18 +645,18 @@ static int fsl_ifc_wait(struct mtd_info *mtd, struct nand_chip *chip)
 	u32 nand_fsr;
 
 	/* Use READ_STATUS command, but wait for the device to be ready */
-	out_be32(&ifc->ifc_nand.nand_fir0,
-		 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-		 (IFC_FIR_OP_RDSTAT << IFC_NAND_FIR0_OP1_SHIFT));
-	out_be32(&ifc->ifc_nand.nand_fcr0, NAND_CMD_STATUS <<
-			IFC_NAND_FCR0_CMD0_SHIFT);
-	out_be32(&ifc->ifc_nand.nand_fbcr, 1);
+	iowrite32be((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+		    (IFC_FIR_OP_RDSTAT << IFC_NAND_FIR0_OP1_SHIFT),
+		    &ifc->ifc_nand.nand_fir0);
+	iowrite32be(NAND_CMD_STATUS << IFC_NAND_FCR0_CMD0_SHIFT,
+		    &ifc->ifc_nand.nand_fcr0);
+	iowrite32be(1, &ifc->ifc_nand.nand_fbcr);
 	set_addr(mtd, 0, 0, 0);
 	ifc_nand_ctrl->read_bytes = 1;
 
 	fsl_ifc_run_command(mtd);
 
-	nand_fsr = in_be32(&ifc->ifc_nand.nand_fsr);
+	nand_fsr = ioread32be(&ifc->ifc_nand.nand_fsr);
 
 	/*
 	 * The chip always seems to report that it is
@@ -744,34 +750,34 @@ static void fsl_ifc_sram_init(struct fsl_ifc_mtd *priv)
 	uint32_t cs = priv->bank;
 
 	/* Save CSOR and CSOR_ext */
-	csor = in_be32(&ifc->csor_cs[cs].csor);
-	csor_ext = in_be32(&ifc->csor_cs[cs].csor_ext);
+	csor = ioread32be(&ifc->csor_cs[cs].csor);
+	csor_ext = ioread32be(&ifc->csor_cs[cs].csor_ext);
 
 	/* chage PageSize 8K and SpareSize 1K*/
 	csor_8k = (csor & ~(CSOR_NAND_PGS_MASK)) | 0x0018C000;
-	out_be32(&ifc->csor_cs[cs].csor, csor_8k);
-	out_be32(&ifc->csor_cs[cs].csor_ext, 0x0000400);
+	iowrite32be(csor_8k, &ifc->csor_cs[cs].csor);
+	iowrite32be(0x0000400, &ifc->csor_cs[cs].csor_ext);
 
 	/* READID */
-	out_be32(&ifc->ifc_nand.nand_fir0,
-			(IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
-			(IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
-			(IFC_FIR_OP_RB << IFC_NAND_FIR0_OP2_SHIFT));
-	out_be32(&ifc->ifc_nand.nand_fcr0,
-			NAND_CMD_READID << IFC_NAND_FCR0_CMD0_SHIFT);
-	out_be32(&ifc->ifc_nand.row3, 0x0);
+	iowrite32be((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
+		    (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
+		    (IFC_FIR_OP_RB << IFC_NAND_FIR0_OP2_SHIFT),
+		    &ifc->ifc_nand.nand_fir0);
+	iowrite32be(NAND_CMD_READID << IFC_NAND_FCR0_CMD0_SHIFT,
+		    &ifc->ifc_nand.nand_fcr0);
+	iowrite32be(0x0, &ifc->ifc_nand.row3);
 
-	out_be32(&ifc->ifc_nand.nand_fbcr, 0x0);
+	iowrite32be(0x0, &ifc->ifc_nand.nand_fbcr);
 
 	/* Program ROW0/COL0 */
-	out_be32(&ifc->ifc_nand.row0, 0x0);
-	out_be32(&ifc->ifc_nand.col0, 0x0);
+	iowrite32be(0x0, &ifc->ifc_nand.row0);
+	iowrite32be(0x0, &ifc->ifc_nand.col0);
 
 	/* set the chip select for NAND Transaction */
-	out_be32(&ifc->ifc_nand.nand_csel, cs << IFC_NAND_CSEL_SHIFT);
+	iowrite32be(cs << IFC_NAND_CSEL_SHIFT, &ifc->ifc_nand.nand_csel);
 
 	/* start read seq */
-	out_be32(&ifc->ifc_nand.nandseq_strt, IFC_NAND_SEQ_STRT_FIR_STRT);
+	iowrite32be(IFC_NAND_SEQ_STRT_FIR_STRT, &ifc->ifc_nand.nandseq_strt);
 
 	/* wait for command complete flag or timeout */
 	wait_event_timeout(ctrl->nand_wait, ctrl->nand_stat,
@@ -781,8 +787,8 @@ static void fsl_ifc_sram_init(struct fsl_ifc_mtd *priv)
 		printk(KERN_ERR "fsl-ifc: Failed to Initialise SRAM\n");
 
 	/* Restore CSOR and CSOR_ext */
-	out_be32(&ifc->csor_cs[cs].csor, csor);
-	out_be32(&ifc->csor_cs[cs].csor_ext, csor_ext);
+	iowrite32be(csor, &ifc->csor_cs[cs].csor);
+	iowrite32be(csor_ext, &ifc->csor_cs[cs].csor_ext);
 }
 
 static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
@@ -799,7 +805,7 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 
 	/* fill in nand_chip structure */
 	/* set up function call table */
-	if ((in_be32(&ifc->cspr_cs[priv->bank].cspr)) & CSPR_PORT_SIZE_16)
+	if ((ioread32be(&ifc->cspr_cs[priv->bank].cspr)) & CSPR_PORT_SIZE_16)
 		chip->read_byte = fsl_ifc_read_byte16;
 	else
 		chip->read_byte = fsl_ifc_read_byte;
@@ -813,13 +819,13 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	chip->bbt_td = &bbt_main_descr;
 	chip->bbt_md = &bbt_mirror_descr;
 
-	out_be32(&ifc->ifc_nand.ncfgr, 0x0);
+	iowrite32be(0x0, &ifc->ifc_nand.ncfgr);
 
 	/* set up nand options */
 	chip->bbt_options = NAND_BBT_USE_FLASH;
 
 
-	if (in_be32(&ifc->cspr_cs[priv->bank].cspr) & CSPR_PORT_SIZE_16) {
+	if (ioread32be(&ifc->cspr_cs[priv->bank].cspr) & CSPR_PORT_SIZE_16) {
 		chip->read_byte = fsl_ifc_read_byte16;
 		chip->options |= NAND_BUSWIDTH_16;
 	} else {
@@ -832,7 +838,7 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	chip->ecc.read_page = fsl_ifc_read_page;
 	chip->ecc.write_page = fsl_ifc_write_page;
 
-	csor = in_be32(&ifc->csor_cs[priv->bank].csor);
+	csor = ioread32be(&ifc->csor_cs[priv->bank].csor);
 
 	/* Hardware generates ECC per 512 Bytes */
 	chip->ecc.size = 512;
@@ -884,7 +890,7 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 		chip->ecc.mode = NAND_ECC_SOFT;
 	}
 
-	ver = in_be32(&ifc->ifc_rev);
+	ver = ioread32be(&ifc->ifc_rev);
 	if (ver == FSL_IFC_V1_1_0)
 		fsl_ifc_sram_init(priv);
 
@@ -910,7 +916,7 @@ static int fsl_ifc_chip_remove(struct fsl_ifc_mtd *priv)
 static int match_bank(struct fsl_ifc_regs __iomem *ifc, int bank,
 		      phys_addr_t addr)
 {
-	u32 cspr = in_be32(&ifc->cspr_cs[bank].cspr);
+	u32 cspr = ioread32be(&ifc->cspr_cs[bank].cspr);
 
 	if (!(cspr & CSPR_V))
 		return 0;
@@ -997,17 +1003,16 @@ static int fsl_ifc_nand_probe(struct platform_device *dev)
 
 	dev_set_drvdata(priv->dev, priv);
 
-	out_be32(&ifc->ifc_nand.nand_evter_en,
-			IFC_NAND_EVTER_EN_OPC_EN |
-			IFC_NAND_EVTER_EN_FTOER_EN |
-			IFC_NAND_EVTER_EN_WPER_EN);
+	iowrite32be(IFC_NAND_EVTER_EN_OPC_EN |
+		    IFC_NAND_EVTER_EN_FTOER_EN |
+		    IFC_NAND_EVTER_EN_WPER_EN,
+		    &ifc->ifc_nand.nand_evter_en);
 
 	/* enable NAND Machine Interrupts */
-	out_be32(&ifc->ifc_nand.nand_evter_intr_en,
-			IFC_NAND_EVTER_INTR_OPCIR_EN |
-			IFC_NAND_EVTER_INTR_FTOERIR_EN |
-			IFC_NAND_EVTER_INTR_WPERIR_EN);
-
+	iowrite32be(IFC_NAND_EVTER_INTR_OPCIR_EN |
+		    IFC_NAND_EVTER_INTR_FTOERIR_EN |
+		    IFC_NAND_EVTER_INTR_WPERIR_EN,
+		    &ifc->ifc_nand.nand_evter_intr_en);
 	priv->mtd.name = kasprintf(GFP_KERNEL, "%x.flash", (unsigned)res.start);
 	if (!priv->mtd.name) {
 		ret = -ENOMEM;

drivers/mtd/nand/gpmi-nand/bch-regs.h

@@ -61,6 +61,16 @@
 			& BM_BCH_FLASH0LAYOUT0_ECC0)		\
 	)
 
+#define MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14	10
+#define MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14			\
+				(0x1 << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)
+#define BF_BCH_FLASH0LAYOUT0_GF(v, x)				\
+	((GPMI_IS_MX6Q(x) && ((v) == 14))			\
+		? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)	\
+			& MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14)	\
+		: 0						\
+	)
+
 #define BP_BCH_FLASH0LAYOUT0_DATA0_SIZE		0
 #define BM_BCH_FLASH0LAYOUT0_DATA0_SIZE		\
 			(0xfff << BP_BCH_FLASH0LAYOUT0_DATA0_SIZE)
@@ -93,6 +103,16 @@
 			& BM_BCH_FLASH0LAYOUT1_ECCN)		\
 	)
 
+#define MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14	10
+#define MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14			\
+				(0x1 << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)
+#define BF_BCH_FLASH0LAYOUT1_GF(v, x)				\
+	((GPMI_IS_MX6Q(x) && ((v) == 14))			\
+		? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)	\
+			& MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14)	\
+		: 0						\
+	)
+
 #define BP_BCH_FLASH0LAYOUT1_DATAN_SIZE		0
 #define BM_BCH_FLASH0LAYOUT1_DATAN_SIZE		\
 			(0xfff << BP_BCH_FLASH0LAYOUT1_DATAN_SIZE)
@@ -103,4 +123,6 @@
 		? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)	\
 		: ((v) & BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)		\
 	)
+
+#define HW_BCH_VERSION				0x00000160
 #endif

drivers/mtd/nand/gpmi-nand/gpmi-lib.c

@@ -208,6 +208,11 @@ void gpmi_dump_info(struct gpmi_nand_data *this)
 	}
 
 	/* start to print out the BCH info */
+	pr_err("Show BCH registers :\n");
+	for (i = 0; i <= HW_BCH_VERSION / 0x10 + 1; i++) {
+		reg = readl(r->bch_regs + i * 0x10);
+		pr_err("offset 0x%.3x : 0x%.8x\n", i * 0x10, reg);
+	}
 	pr_err("BCH Geometry :\n");
 	pr_err("GF length              : %u\n", geo->gf_len);
 	pr_err("ECC Strength           : %u\n", geo->ecc_strength);
@@ -232,6 +237,7 @@ int bch_set_geometry(struct gpmi_nand_data *this)
 	unsigned int metadata_size;
 	unsigned int ecc_strength;
 	unsigned int page_size;
+	unsigned int gf_len;
 	int ret;
 
 	if (common_nfc_set_geometry(this))
@@ -242,6 +248,7 @@ int bch_set_geometry(struct gpmi_nand_data *this)
 	metadata_size = bch_geo->metadata_size;
 	ecc_strength  = bch_geo->ecc_strength >> 1;
 	page_size     = bch_geo->page_size;
+	gf_len        = bch_geo->gf_len;
 
 	ret = gpmi_enable_clk(this);
 	if (ret)
@@ -263,11 +270,13 @@ int bch_set_geometry(struct gpmi_nand_data *this)
 	writel(BF_BCH_FLASH0LAYOUT0_NBLOCKS(block_count)
 			| BF_BCH_FLASH0LAYOUT0_META_SIZE(metadata_size)
 			| BF_BCH_FLASH0LAYOUT0_ECC0(ecc_strength, this)
+			| BF_BCH_FLASH0LAYOUT0_GF(gf_len, this)
 			| BF_BCH_FLASH0LAYOUT0_DATA0_SIZE(block_size, this),
 			r->bch_regs + HW_BCH_FLASH0LAYOUT0);
 
 	writel(BF_BCH_FLASH0LAYOUT1_PAGE_SIZE(page_size)
 			| BF_BCH_FLASH0LAYOUT1_ECCN(ecc_strength, this)
+			| BF_BCH_FLASH0LAYOUT1_GF(gf_len, this)
 			| BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(block_size, this),
 			r->bch_regs + HW_BCH_FLASH0LAYOUT1);
 

drivers/mtd/nand/gpmi-nand/gpmi-nand.c

@@ -94,6 +94,25 @@ static inline int get_ecc_strength(struct gpmi_nand_data *this)
 	return round_down(ecc_strength, 2);
 }
 
+static inline bool gpmi_check_ecc(struct gpmi_nand_data *this)
+{
+	struct bch_geometry *geo = &this->bch_geometry;
+
+	/* Do the sanity check. */
+	if (GPMI_IS_MX23(this) || GPMI_IS_MX28(this)) {
+		/* The mx23/mx28 only support the GF13. */
+		if (geo->gf_len == 14)
+			return false;
+
+		if (geo->ecc_strength > MXS_ECC_STRENGTH_MAX)
+			return false;
+	} else if (GPMI_IS_MX6Q(this)) {
+		if (geo->ecc_strength > MX6_ECC_STRENGTH_MAX)
+			return false;
+	}
+	return true;
+}
+
 int common_nfc_set_geometry(struct gpmi_nand_data *this)
 {
 	struct bch_geometry *geo = &this->bch_geometry;
@@ -112,17 +131,24 @@ int common_nfc_set_geometry(struct gpmi_nand_data *this)
 	/* The default for the length of Galois Field. */
 	geo->gf_len = 13;
 
-	/* The default for chunk size. There is no oobsize greater then 512. */
+	/* The default for chunk size. */
 	geo->ecc_chunk_size = 512;
-	while (geo->ecc_chunk_size < mtd->oobsize)
+	while (geo->ecc_chunk_size < mtd->oobsize) {
 		geo->ecc_chunk_size *= 2; /* keep C >= O */
+		geo->gf_len = 14;
+	}
 
 	geo->ecc_chunk_count = mtd->writesize / geo->ecc_chunk_size;
 
 	/* We use the same ECC strength for all chunks. */
 	geo->ecc_strength = get_ecc_strength(this);
-	if (!geo->ecc_strength) {
-		pr_err("wrong ECC strength.\n");
+	if (!gpmi_check_ecc(this)) {
+		dev_err(this->dev,
+			"We can not support this nand chip."
+			" Its required ecc strength(%d) is beyond our"
+			" capability(%d).\n", geo->ecc_strength,
+			(GPMI_IS_MX6Q(this) ? MX6_ECC_STRENGTH_MAX
+					: MXS_ECC_STRENGTH_MAX));
 		return -EINVAL;
 	}
 
@@ -920,8 +946,7 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	dma_addr_t    auxiliary_phys;
 	unsigned int  i;
 	unsigned char *status;
-	unsigned int  failed;
-	unsigned int  corrected;
+	unsigned int  max_bitflips = 0;
 	int           ret;
 
 	pr_debug("page number is : %d\n", page);
@@ -945,35 +970,25 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 			payload_virt, payload_phys);
 	if (ret) {
 		pr_err("Error in ECC-based read: %d\n", ret);
-		goto exit_nfc;
+		return ret;
 	}
 
 	/* handle the block mark swapping */
 	block_mark_swapping(this, payload_virt, auxiliary_virt);
 
 	/* Loop over status bytes, accumulating ECC status. */
-	failed		= 0;
-	corrected	= 0;
-	status		= auxiliary_virt + nfc_geo->auxiliary_status_offset;
+	status = auxiliary_virt + nfc_geo->auxiliary_status_offset;
 
 	for (i = 0; i < nfc_geo->ecc_chunk_count; i++, status++) {
 		if ((*status == STATUS_GOOD) || (*status == STATUS_ERASED))
 			continue;
 
 		if (*status == STATUS_UNCORRECTABLE) {
-			failed++;
+			mtd->ecc_stats.failed++;
 			continue;
 		}
-		corrected += *status;
-	}
-
-	/*
-	 * Propagate ECC status to the owning MTD only when failed or
-	 * corrected times nearly reaches our ECC correction threshold.
-	 */
-	if (failed || corrected >= (nfc_geo->ecc_strength - 1)) {
-		mtd->ecc_stats.failed    += failed;
-		mtd->ecc_stats.corrected += corrected;
+		mtd->ecc_stats.corrected += *status;
+		max_bitflips = max_t(unsigned int, max_bitflips, *status);
 	}
 
 	if (oob_required) {
@@ -995,8 +1010,8 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 			this->payload_virt, this->payload_phys,
 			nfc_geo->payload_size,
 			payload_virt, payload_phys);
-exit_nfc:
-	return ret;
+
+	return max_bitflips;
 }
 
 static int gpmi_ecc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
@@ -1668,8 +1683,8 @@ exit_nfc_init:
 	release_resources(this);
 exit_acquire_resources:
 	platform_set_drvdata(pdev, NULL);
-	kfree(this);
 	dev_err(this->dev, "driver registration failed: %d\n", ret);
+	kfree(this);
 
 	return ret;
 }

drivers/mtd/nand/gpmi-nand/gpmi-nand.h

@@ -284,6 +284,10 @@ extern int gpmi_read_page(struct gpmi_nand_data *,
 #define STATUS_ERASED		0xff
 #define STATUS_UNCORRECTABLE	0xfe
 
+/* BCH's bit correction capability. */
+#define MXS_ECC_STRENGTH_MAX	20	/* mx23 and mx28 */
+#define MX6_ECC_STRENGTH_MAX	40
+
 /* Use the platform_id to distinguish different Archs. */
 #define IS_MX23			0x0
 #define IS_MX28			0x1

drivers/mtd/nand/mxc_nand.c

@@ -530,12 +530,23 @@ static void send_page_v1(struct mtd_info *mtd, unsigned int ops)
 
 static void send_read_id_v3(struct mxc_nand_host *host)
 {
+	struct nand_chip *this = &host->nand;
+
 	/* Read ID into main buffer */
 	writel(NFC_ID, NFC_V3_LAUNCH);
 
 	wait_op_done(host, true);
 
 	memcpy32_fromio(host->data_buf, host->main_area0, 16);
+
+	if (this->options & NAND_BUSWIDTH_16) {
+		/* compress the ID info */
+		host->data_buf[1] = host->data_buf[2];
+		host->data_buf[2] = host->data_buf[4];
+		host->data_buf[3] = host->data_buf[6];
+		host->data_buf[4] = host->data_buf[8];
+		host->data_buf[5] = host->data_buf[10];
+	}
 }
 
 /* Request the NANDFC to perform a read of the NAND device ID. */

drivers/mtd/nand/nand_base.c

@@ -825,13 +825,8 @@ static void panic_nand_wait(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 {
 
-	unsigned long timeo = jiffies;
 	int status, state = chip->state;
-
-	if (state == FL_ERASING)
-		timeo += (HZ * 400) / 1000;
-	else
-		timeo += (HZ * 20) / 1000;
+	unsigned long timeo = (state == FL_ERASING ? 400 : 20);
 
 	led_trigger_event(nand_led_trigger, LED_FULL);
 
@@ -849,6 +844,7 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 	if (in_interrupt() || oops_in_progress)
 		panic_nand_wait(mtd, chip, timeo);
 	else {
+		timeo = jiffies + msecs_to_jiffies(timeo);
 		while (time_before(jiffies, timeo)) {
 			if (chip->dev_ready) {
 				if (chip->dev_ready(mtd))

drivers/mtd/nand/nand_ecc.c

@@ -55,8 +55,7 @@ struct mtd_info;
 #define MODULE_AUTHOR(x)	/* x */
 #define MODULE_DESCRIPTION(x)	/* x */
 
-#define printk printf
-#define KERN_ERR		""
+#define pr_err printf
 #endif
 
 /*
@@ -507,7 +506,7 @@ int __nand_correct_data(unsigned char *buf,
 	if ((bitsperbyte[b0] + bitsperbyte[b1] + bitsperbyte[b2]) == 1)
 		return 1;	/* error in ECC data; no action needed */
 
-	printk(KERN_ERR "uncorrectable error : ");
+	pr_err("%s: uncorrectable ECC error", __func__);
 	return -1;
 }
 EXPORT_SYMBOL(__nand_correct_data);

drivers/mtd/nand/nandsim.c

@@ -1468,12 +1468,12 @@ int do_read_error(struct nandsim *ns, int num)
 
 void do_bit_flips(struct nandsim *ns, int num)
 {
-	if (bitflips && random32() < (1 << 22)) {
+	if (bitflips && prandom_u32() < (1 << 22)) {
 		int flips = 1;
 		if (bitflips > 1)
-			flips = (random32() % (int) bitflips) + 1;
+			flips = (prandom_u32() % (int) bitflips) + 1;
 		while (flips--) {
-			int pos = random32() % (num * 8);
+			int pos = prandom_u32() % (num * 8);
 			ns->buf.byte[pos / 8] ^= (1 << (pos % 8));
 			NS_WARN("read_page: flipping bit %d in page %d "
 				"reading from %d ecc: corrected=%u failed=%u\n",

drivers/mtd/nand/omap2.c

@@ -22,9 +22,12 @@
 #include <linux/omap-dma.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #ifdef CONFIG_MTD_NAND_OMAP_BCH
 #include <linux/bch.h>
+#include <linux/platform_data/elm.h>
 #endif
 
 #include <linux/platform_data/mtd-nand-omap2.h>
@@ -117,6 +120,33 @@
 
 #define OMAP24XX_DMA_GPMC		4
 
+#define BCH8_MAX_ERROR		8	/* upto 8 bit correctable */
+#define BCH4_MAX_ERROR		4	/* upto 4 bit correctable */
+
+#define SECTOR_BYTES		512
+/* 4 bit padding to make byte aligned, 56 = 52 + 4 */
+#define BCH4_BIT_PAD		4
+#define BCH8_ECC_MAX		((SECTOR_BYTES + BCH8_ECC_OOB_BYTES) * 8)
+#define BCH4_ECC_MAX		((SECTOR_BYTES + BCH4_ECC_OOB_BYTES) * 8)
+
+/* GPMC ecc engine settings for read */
+#define BCH_WRAPMODE_1		1	/* BCH wrap mode 1 */
+#define BCH8R_ECC_SIZE0		0x1a	/* ecc_size0 = 26 */
+#define BCH8R_ECC_SIZE1		0x2	/* ecc_size1 = 2 */
+#define BCH4R_ECC_SIZE0		0xd	/* ecc_size0 = 13 */
+#define BCH4R_ECC_SIZE1		0x3	/* ecc_size1 = 3 */
+
+/* GPMC ecc engine settings for write */
+#define BCH_WRAPMODE_6		6	/* BCH wrap mode 6 */
+#define BCH_ECC_SIZE0		0x0	/* ecc_size0 = 0, no oob protection */
+#define BCH_ECC_SIZE1		0x20	/* ecc_size1 = 32 */
+
+#ifdef CONFIG_MTD_NAND_OMAP_BCH
+static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
+	0xac, 0x6b, 0xff, 0x99, 0x7b};
+static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10};
+#endif
+
 /* oob info generated runtime depending on ecc algorithm and layout selected */
 static struct nand_ecclayout omap_oobinfo;
 /* Define some generic bad / good block scan pattern which are used
@@ -156,6 +186,9 @@ struct omap_nand_info {
 #ifdef CONFIG_MTD_NAND_OMAP_BCH
 	struct bch_control             *bch;
 	struct nand_ecclayout           ecclayout;
+	bool				is_elm_used;
+	struct device			*elm_dev;
+	struct device_node		*of_node;
 #endif
 };
 
@@ -1031,6 +1064,13 @@ static int omap_dev_ready(struct mtd_info *mtd)
  * omap3_enable_hwecc_bch - Program OMAP3 GPMC to perform BCH ECC correction
  * @mtd: MTD device structure
  * @mode: Read/Write mode
+ *
+ * When using BCH, sector size is hardcoded to 512 bytes.
+ * Using wrapping mode 6 both for reading and writing if ELM module not uses
+ * for error correction.
+ * On writing,
+ * eccsize0 = 0  (no additional protected byte in spare area)
+ * eccsize1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area)
  */
 static void omap3_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 {
@@ -1039,32 +1079,57 @@ static void omap3_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 	struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
 						   mtd);
 	struct nand_chip *chip = mtd->priv;
-	u32 val;
+	u32 val, wr_mode;
+	unsigned int ecc_size1, ecc_size0;
+
+	/* Using wrapping mode 6 for writing */
+	wr_mode = BCH_WRAPMODE_6;
 
-	nerrors = (info->nand.ecc.bytes == 13) ? 8 : 4;
-	dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
-	nsectors = 1;
 	/*
-	 * Program GPMC to perform correction on one 512-byte sector at a time.
-	 * Using 4 sectors at a time (i.e. ecc.size = 2048) is also possible and
-	 * gives a slight (5%) performance gain (but requires additional code).
+	 * ECC engine enabled for valid ecc_size0 nibbles
+	 * and disabled for ecc_size1 nibbles.
 	 */
+	ecc_size0 = BCH_ECC_SIZE0;
+	ecc_size1 = BCH_ECC_SIZE1;
+
+	/* Perform ecc calculation on 512-byte sector */
+	nsectors = 1;
+
+	/* Update number of error correction */
+	nerrors = info->nand.ecc.strength;
+
+	/* Multi sector reading/writing for NAND flash with page size < 4096 */
+	if (info->is_elm_used && (mtd->writesize <= 4096)) {
+		if (mode == NAND_ECC_READ) {
+			/* Using wrapping mode 1 for reading */
+			wr_mode = BCH_WRAPMODE_1;
+
+			/*
+			 * ECC engine enabled for ecc_size0 nibbles
+			 * and disabled for ecc_size1 nibbles.
+			 */
+			ecc_size0 = (nerrors == 8) ?
+				BCH8R_ECC_SIZE0 : BCH4R_ECC_SIZE0;
+			ecc_size1 = (nerrors == 8) ?
+				BCH8R_ECC_SIZE1 : BCH4R_ECC_SIZE1;
+		}
+
+		/* Perform ecc calculation for one page (< 4096) */
+		nsectors = info->nand.ecc.steps;
+	}
 
 	writel(ECC1, info->reg.gpmc_ecc_control);
 
-	/*
-	 * When using BCH, sector size is hardcoded to 512 bytes.
-	 * Here we are using wrapping mode 6 both for reading and writing, with:
-	 *  size0 = 0  (no additional protected byte in spare area)
-	 *  size1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area)
-	 */
-	val = (32 << ECCSIZE1_SHIFT) | (0 << ECCSIZE0_SHIFT);
+	/* Configure ecc size for BCH */
+	val = (ecc_size1 << ECCSIZE1_SHIFT) | (ecc_size0 << ECCSIZE0_SHIFT);
 	writel(val, info->reg.gpmc_ecc_size_config);
 
+	dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
+
 	/* BCH configuration */
 	val = ((1                        << 16) | /* enable BCH */
 	       (((nerrors == 8) ? 1 : 0) << 12) | /* 8 or 4 bits */
-	       (0x06                     <<  8) | /* wrap mode = 6 */
+	       (wr_mode                  <<  8) | /* wrap mode */
 	       (dev_width                <<  7) | /* bus width */
 	       (((nsectors-1) & 0x7)     <<  4) | /* number of sectors */
 	       (info->gpmc_cs            <<  1) | /* ECC CS */
@@ -1072,7 +1137,7 @@ static void omap3_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 
 	writel(val, info->reg.gpmc_ecc_config);
 
-	/* clear ecc and enable bits */
+	/* Clear ecc and enable bits */
 	writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
 }
 
@@ -1161,6 +1226,298 @@ static int omap3_calculate_ecc_bch8(struct mtd_info *mtd, const u_char *dat,
 	return 0;
 }
 
+/**
+ * omap3_calculate_ecc_bch - Generate bytes of ECC bytes
+ * @mtd:	MTD device structure
+ * @dat:	The pointer to data on which ecc is computed
+ * @ecc_code:	The ecc_code buffer
+ *
+ * Support calculating of BCH4/8 ecc vectors for the page
+ */
+static int omap3_calculate_ecc_bch(struct mtd_info *mtd, const u_char *dat,
+				    u_char *ecc_code)
+{
+	struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
+						   mtd);
+	unsigned long nsectors, bch_val1, bch_val2, bch_val3, bch_val4;
+	int i, eccbchtsel;
+
+	nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1;
+	/*
+	 * find BCH scheme used
+	 * 0 -> BCH4
+	 * 1 -> BCH8
+	 */
+	eccbchtsel = ((readl(info->reg.gpmc_ecc_config) >> 12) & 0x3);
+
+	for (i = 0; i < nsectors; i++) {
+
+		/* Read hw-computed remainder */
+		bch_val1 = readl(info->reg.gpmc_bch_result0[i]);
+		bch_val2 = readl(info->reg.gpmc_bch_result1[i]);
+		if (eccbchtsel) {
+			bch_val3 = readl(info->reg.gpmc_bch_result2[i]);
+			bch_val4 = readl(info->reg.gpmc_bch_result3[i]);
+		}
+
+		if (eccbchtsel) {
+			/* BCH8 ecc scheme */
+			*ecc_code++ = (bch_val4 & 0xFF);
+			*ecc_code++ = ((bch_val3 >> 24) & 0xFF);
+			*ecc_code++ = ((bch_val3 >> 16) & 0xFF);
+			*ecc_code++ = ((bch_val3 >> 8) & 0xFF);
+			*ecc_code++ = (bch_val3 & 0xFF);
+			*ecc_code++ = ((bch_val2 >> 24) & 0xFF);
+			*ecc_code++ = ((bch_val2 >> 16) & 0xFF);
+			*ecc_code++ = ((bch_val2 >> 8) & 0xFF);
+			*ecc_code++ = (bch_val2 & 0xFF);
+			*ecc_code++ = ((bch_val1 >> 24) & 0xFF);
+			*ecc_code++ = ((bch_val1 >> 16) & 0xFF);
+			*ecc_code++ = ((bch_val1 >> 8) & 0xFF);
+			*ecc_code++ = (bch_val1 & 0xFF);
+			/*
+			 * Setting 14th byte to zero to handle
+			 * erased page & maintain compatibility
+			 * with RBL
+			 */
+			*ecc_code++ = 0x0;
+		} else {
+			/* BCH4 ecc scheme */
+			*ecc_code++ = ((bch_val2 >> 12) & 0xFF);
+			*ecc_code++ = ((bch_val2 >> 4) & 0xFF);
+			*ecc_code++ = ((bch_val2 & 0xF) << 4) |
+				((bch_val1 >> 28) & 0xF);
+			*ecc_code++ = ((bch_val1 >> 20) & 0xFF);
+			*ecc_code++ = ((bch_val1 >> 12) & 0xFF);
+			*ecc_code++ = ((bch_val1 >> 4) & 0xFF);
+			*ecc_code++ = ((bch_val1 & 0xF) << 4);
+			/*
+			 * Setting 8th byte to zero to handle
+			 * erased page
+			 */
+			*ecc_code++ = 0x0;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * erased_sector_bitflips - count bit flips
+ * @data:	data sector buffer
+ * @oob:	oob buffer
+ * @info:	omap_nand_info
+ *
+ * Check the bit flips in erased page falls below correctable level.
+ * If falls below, report the page as erased with correctable bit
+ * flip, else report as uncorrectable page.
+ */
+static int erased_sector_bitflips(u_char *data, u_char *oob,
+		struct omap_nand_info *info)
+{
+	int flip_bits = 0, i;
+
+	for (i = 0; i < info->nand.ecc.size; i++) {
+		flip_bits += hweight8(~data[i]);
+		if (flip_bits > info->nand.ecc.strength)
+			return 0;
+	}
+
+	for (i = 0; i < info->nand.ecc.bytes - 1; i++) {
+		flip_bits += hweight8(~oob[i]);
+		if (flip_bits > info->nand.ecc.strength)
+			return 0;
+	}
+
+	/*
+	 * Bit flips falls in correctable level.
+	 * Fill data area with 0xFF
+	 */
+	if (flip_bits) {
+		memset(data, 0xFF, info->nand.ecc.size);
+		memset(oob, 0xFF, info->nand.ecc.bytes);
+	}
+
+	return flip_bits;
+}
+
+/**
+ * omap_elm_correct_data - corrects page data area in case error reported
+ * @mtd:	MTD device structure
+ * @data:	page data
+ * @read_ecc:	ecc read from nand flash
+ * @calc_ecc:	ecc read from HW ECC registers
+ *
+ * Calculated ecc vector reported as zero in case of non-error pages.
+ * In case of error/erased pages non-zero error vector is reported.
+ * In case of non-zero ecc vector, check read_ecc at fixed offset
+ * (x = 13/7 in case of BCH8/4 == 0) to find page programmed or not.
+ * To handle bit flips in this data, count the number of 0's in
+ * read_ecc[x] and check if it greater than 4. If it is less, it is
+ * programmed page, else erased page.
+ *
+ * 1. If page is erased, check with standard ecc vector (ecc vector
+ * for erased page to find any bit flip). If check fails, bit flip
+ * is present in erased page. Count the bit flips in erased page and
+ * if it falls under correctable level, report page with 0xFF and
+ * update the correctable bit information.
+ * 2. If error is reported on programmed page, update elm error
+ * vector and correct the page with ELM error correction routine.
+ *
+ */
+static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
+				u_char *read_ecc, u_char *calc_ecc)
+{
+	struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
+			mtd);
+	int eccsteps = info->nand.ecc.steps;
+	int i , j, stat = 0;
+	int eccsize, eccflag, ecc_vector_size;
+	struct elm_errorvec err_vec[ERROR_VECTOR_MAX];
+	u_char *ecc_vec = calc_ecc;
+	u_char *spare_ecc = read_ecc;
+	u_char *erased_ecc_vec;
+	enum bch_ecc type;
+	bool is_error_reported = false;
+
+	/* Initialize elm error vector to zero */
+	memset(err_vec, 0, sizeof(err_vec));
+
+	if (info->nand.ecc.strength == BCH8_MAX_ERROR) {
+		type = BCH8_ECC;
+		erased_ecc_vec = bch8_vector;
+	} else {
+		type = BCH4_ECC;
+		erased_ecc_vec = bch4_vector;
+	}
+
+	ecc_vector_size = info->nand.ecc.bytes;
+
+	/*
+	 * Remove extra byte padding for BCH8 RBL
+	 * compatibility and erased page handling
+	 */
+	eccsize = ecc_vector_size - 1;
+
+	for (i = 0; i < eccsteps ; i++) {
+		eccflag = 0;	/* initialize eccflag */
+
+		/*
+		 * Check any error reported,
+		 * In case of error, non zero ecc reported.
+		 */
+
+		for (j = 0; (j < eccsize); j++) {
+			if (calc_ecc[j] != 0) {
+				eccflag = 1; /* non zero ecc, error present */
+				break;
+			}
+		}
+
+		if (eccflag == 1) {
+			/*
+			 * Set threshold to minimum of 4, half of ecc.strength/2
+			 * to allow max bit flip in byte to 4
+			 */
+			unsigned int threshold = min_t(unsigned int, 4,
+					info->nand.ecc.strength / 2);
+
+			/*
+			 * Check data area is programmed by counting
+			 * number of 0's at fixed offset in spare area.
+			 * Checking count of 0's against threshold.
+			 * In case programmed page expects at least threshold
+			 * zeros in byte.
+			 * If zeros are less than threshold for programmed page/
+			 * zeros are more than threshold erased page, either
+			 * case page reported as uncorrectable.
+			 */
+			if (hweight8(~read_ecc[eccsize]) >= threshold) {
+				/*
+				 * Update elm error vector as
+				 * data area is programmed
+				 */
+				err_vec[i].error_reported = true;
+				is_error_reported = true;
+			} else {
+				/* Error reported in erased page */
+				int bitflip_count;
+				u_char *buf = &data[info->nand.ecc.size * i];
+
+				if (memcmp(calc_ecc, erased_ecc_vec, eccsize)) {
+					bitflip_count = erased_sector_bitflips(
+							buf, read_ecc, info);
+
+					if (bitflip_count)
+						stat += bitflip_count;
+					else
+						return -EINVAL;
+				}
+			}
+		}
+
+		/* Update the ecc vector */
+		calc_ecc += ecc_vector_size;
+		read_ecc += ecc_vector_size;
+	}
+
+	/* Check if any error reported */
+	if (!is_error_reported)
+		return 0;
+
+	/* Decode BCH error using ELM module */
+	elm_decode_bch_error_page(info->elm_dev, ecc_vec, err_vec);
+
+	for (i = 0; i < eccsteps; i++) {
+		if (err_vec[i].error_reported) {
+			for (j = 0; j < err_vec[i].error_count; j++) {
+				u32 bit_pos, byte_pos, error_max, pos;
+
+				if (type == BCH8_ECC)
+					error_max = BCH8_ECC_MAX;
+				else
+					error_max = BCH4_ECC_MAX;
+
+				if (info->nand.ecc.strength == BCH8_MAX_ERROR)
+					pos = err_vec[i].error_loc[j];
+				else
+					/* Add 4 to take care 4 bit padding */
+					pos = err_vec[i].error_loc[j] +
+						BCH4_BIT_PAD;
+
+				/* Calculate bit position of error */
+				bit_pos = pos % 8;
+
+				/* Calculate byte position of error */
+				byte_pos = (error_max - pos - 1) / 8;
+
+				if (pos < error_max) {
+					if (byte_pos < 512)
+						data[byte_pos] ^= 1 << bit_pos;
+					else
+						spare_ecc[byte_pos - 512] ^=
+							1 << bit_pos;
+				}
+				/* else, not interested to correct ecc */
+			}
+		}
+
+		/* Update number of correctable errors */
+		stat += err_vec[i].error_count;
+
+		/* Update page data with sector size */
+		data += info->nand.ecc.size;
+		spare_ecc += ecc_vector_size;
+	}
+
+	for (i = 0; i < eccsteps; i++)
+		/* Return error if uncorrectable error present */
+		if (err_vec[i].error_uncorrectable)
+			return -EINVAL;
+
+	return stat;
+}
+
 /**
  * omap3_correct_data_bch - Decode received data and correct errors
  * @mtd: MTD device structure
@@ -1193,6 +1550,92 @@ static int omap3_correct_data_bch(struct mtd_info *mtd, u_char *data,
 	return count;
 }
 
+/**
+ * omap_write_page_bch - BCH ecc based write page function for entire page
+ * @mtd:		mtd info structure
+ * @chip:		nand chip info structure
+ * @buf:		data buffer
+ * @oob_required:	must write chip->oob_poi to OOB
+ *
+ * Custom write page method evolved to support multi sector writing in one shot
+ */
+static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
+				  const uint8_t *buf, int oob_required)
+{
+	int i;
+	uint8_t *ecc_calc = chip->buffers->ecccalc;
+	uint32_t *eccpos = chip->ecc.layout->eccpos;
+
+	/* Enable GPMC ecc engine */
+	chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
+
+	/* Write data */
+	chip->write_buf(mtd, buf, mtd->writesize);
+
+	/* Update ecc vector from GPMC result registers */
+	chip->ecc.calculate(mtd, buf, &ecc_calc[0]);
+
+	for (i = 0; i < chip->ecc.total; i++)
+		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+
+	/* Write ecc vector to OOB area */
+	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+	return 0;
+}
+
+/**
+ * omap_read_page_bch - BCH ecc based page read function for entire page
+ * @mtd:		mtd info structure
+ * @chip:		nand chip info structure
+ * @buf:		buffer to store read data
+ * @oob_required:	caller requires OOB data read to chip->oob_poi
+ * @page:		page number to read
+ *
+ * For BCH ecc scheme, GPMC used for syndrome calculation and ELM module
+ * used for error correction.
+ * Custom method evolved to support ELM error correction & multi sector
+ * reading. On reading page data area is read along with OOB data with
+ * ecc engine enabled. ecc vector updated after read of OOB data.
+ * For non error pages ecc vector reported as zero.
+ */
+static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
+				uint8_t *buf, int oob_required, int page)
+{
+	uint8_t *ecc_calc = chip->buffers->ecccalc;
+	uint8_t *ecc_code = chip->buffers->ecccode;
+	uint32_t *eccpos = chip->ecc.layout->eccpos;
+	uint8_t *oob = &chip->oob_poi[eccpos[0]];
+	uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0];
+	int stat;
+	unsigned int max_bitflips = 0;
+
+	/* Enable GPMC ecc engine */
+	chip->ecc.hwctl(mtd, NAND_ECC_READ);
+
+	/* Read data */
+	chip->read_buf(mtd, buf, mtd->writesize);
+
+	/* Read oob bytes */
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1);
+	chip->read_buf(mtd, oob, chip->ecc.total);
+
+	/* Calculate ecc bytes */
+	chip->ecc.calculate(mtd, buf, ecc_calc);
+
+	memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total);
+
+	stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc);
+
+	if (stat < 0) {
+		mtd->ecc_stats.failed++;
+	} else {
+		mtd->ecc_stats.corrected += stat;
+		max_bitflips = max_t(unsigned int, max_bitflips, stat);
+	}
+
+	return max_bitflips;
+}
+
 /**
  * omap3_free_bch - Release BCH ecc resources
  * @mtd: MTD device structure
@@ -1218,43 +1661,86 @@ static int omap3_init_bch(struct mtd_info *mtd, int ecc_opt)
 	struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
 						   mtd);
 #ifdef CONFIG_MTD_NAND_OMAP_BCH8
-	const int hw_errors = 8;
+	const int hw_errors = BCH8_MAX_ERROR;
 #else
-	const int hw_errors = 4;
+	const int hw_errors = BCH4_MAX_ERROR;
 #endif
+	enum bch_ecc bch_type;
+	const __be32 *parp;
+	int lenp;
+	struct device_node *elm_node;
+
 	info->bch = NULL;
 
-	max_errors = (ecc_opt == OMAP_ECC_BCH8_CODE_HW) ? 8 : 4;
+	max_errors = (ecc_opt == OMAP_ECC_BCH8_CODE_HW) ?
+		BCH8_MAX_ERROR : BCH4_MAX_ERROR;
 	if (max_errors != hw_errors) {
 		pr_err("cannot configure %d-bit BCH ecc, only %d-bit supported",
 		       max_errors, hw_errors);
 		goto fail;
 	}
 
-	/* software bch library is only used to detect and locate errors */
-	info->bch = init_bch(13, max_errors, 0x201b /* hw polynomial */);
-	if (!info->bch)
-		goto fail;
+	info->nand.ecc.size = 512;
+	info->nand.ecc.hwctl = omap3_enable_hwecc_bch;
+	info->nand.ecc.mode = NAND_ECC_HW;
+	info->nand.ecc.strength = max_errors;
 
-	info->nand.ecc.size    = 512;
-	info->nand.ecc.hwctl   = omap3_enable_hwecc_bch;
-	info->nand.ecc.correct = omap3_correct_data_bch;
-	info->nand.ecc.mode    = NAND_ECC_HW;
+	if (hw_errors == BCH8_MAX_ERROR)
+		bch_type = BCH8_ECC;
+	else
+		bch_type = BCH4_ECC;
 
-	/*
-	 * The number of corrected errors in an ecc block that will trigger
-	 * block scrubbing defaults to the ecc strength (4 or 8).
-	 * Set mtd->bitflip_threshold here to define a custom threshold.
-	 */
+	/* Detect availability of ELM module */
+	parp = of_get_property(info->of_node, "elm_id", &lenp);
+	if ((parp == NULL) && (lenp != (sizeof(void *) * 2))) {
+		pr_err("Missing elm_id property, fall back to Software BCH\n");
+		info->is_elm_used = false;
+	} else {
+		struct platform_device *pdev;
 
-	if (max_errors == 8) {
-		info->nand.ecc.strength  = 8;
-		info->nand.ecc.bytes     = 13;
-		info->nand.ecc.calculate = omap3_calculate_ecc_bch8;
+		elm_node = of_find_node_by_phandle(be32_to_cpup(parp));
+		pdev = of_find_device_by_node(elm_node);
+		info->elm_dev = &pdev->dev;
+		elm_config(info->elm_dev, bch_type);
+		info->is_elm_used = true;
+	}
+
+	if (info->is_elm_used && (mtd->writesize <= 4096)) {
+
+		if (hw_errors == BCH8_MAX_ERROR)
+			info->nand.ecc.bytes = BCH8_SIZE;
+		else
+			info->nand.ecc.bytes = BCH4_SIZE;
+
+		info->nand.ecc.correct = omap_elm_correct_data;
+		info->nand.ecc.calculate = omap3_calculate_ecc_bch;
+		info->nand.ecc.read_page = omap_read_page_bch;
+		info->nand.ecc.write_page = omap_write_page_bch;
 	} else {
-		info->nand.ecc.strength  = 4;
-		info->nand.ecc.bytes     = 7;
-		info->nand.ecc.calculate = omap3_calculate_ecc_bch4;
+		/*
+		 * software bch library is only used to detect and
+		 * locate errors
+		 */
+		info->bch = init_bch(13, max_errors,
+				0x201b /* hw polynomial */);
+		if (!info->bch)
+			goto fail;
+
+		info->nand.ecc.correct = omap3_correct_data_bch;
+
+		/*
+		 * The number of corrected errors in an ecc block that will
+		 * trigger block scrubbing defaults to the ecc strength (4 or 8)
+		 * Set mtd->bitflip_threshold here to define a custom threshold.
+		 */
+
+		if (max_errors == 8) {
+			info->nand.ecc.bytes = 13;
+			info->nand.ecc.calculate = omap3_calculate_ecc_bch8;
+		} else {
+			info->nand.ecc.bytes = 7;
+			info->nand.ecc.calculate = omap3_calculate_ecc_bch4;
+		}
 	}
 
 	pr_info("enabling NAND BCH ecc with %d-bit correction\n", max_errors);
@@ -1270,7 +1756,7 @@ fail:
  */
 static int omap3_init_bch_tail(struct mtd_info *mtd)
 {
-	int i, steps;
+	int i, steps, offset;
 	struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
 						   mtd);
 	struct nand_ecclayout *layout = &info->ecclayout;
@@ -1292,11 +1778,21 @@ static int omap3_init_bch_tail(struct mtd_info *mtd)
 		goto fail;
 	}
 
+	/* ECC layout compatible with RBL for BCH8 */
+	if (info->is_elm_used && (info->nand.ecc.bytes == BCH8_SIZE))
+		offset = 2;
+	else
+		offset = mtd->oobsize - layout->eccbytes;
+
 	/* put ecc bytes at oob tail */
 	for (i = 0; i < layout->eccbytes; i++)
-		layout->eccpos[i] = mtd->oobsize-layout->eccbytes+i;
+		layout->eccpos[i] = offset + i;
+
+	if (info->is_elm_used && (info->nand.ecc.bytes == BCH8_SIZE))
+		layout->oobfree[0].offset = 2 + layout->eccbytes * steps;
+	else
+		layout->oobfree[0].offset = 2;
 
-	layout->oobfree[0].offset = 2;
 	layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes;
 	info->nand.ecc.layout = layout;
 
@@ -1360,6 +1856,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	info->nand.options	= pdata->devsize;
 	info->nand.options	|= NAND_SKIP_BBTSCAN;
+#ifdef CONFIG_MTD_NAND_OMAP_BCH
+	info->of_node		= pdata->of_node;
+#endif
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {

drivers/mtd/ofpart.c

@@ -174,7 +174,14 @@ out:
 	return rc;
 }
 
+static void __exit ofpart_parser_exit(void)
+{
+	deregister_mtd_parser(&ofpart_parser);
+	deregister_mtd_parser(&ofoldpart_parser);
+}
+
 module_init(ofpart_parser_init);
+module_exit(ofpart_parser_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");

drivers/mtd/tests/mtd_nandecctest.c

@@ -44,7 +44,7 @@ struct nand_ecc_test {
 static void single_bit_error_data(void *error_data, void *correct_data,
 				size_t size)
 {
-	unsigned int offset = random32() % (size * BITS_PER_BYTE);
+	unsigned int offset = prandom_u32() % (size * BITS_PER_BYTE);
 
 	memcpy(error_data, correct_data, size);
 	__change_bit_le(offset, error_data);
@@ -55,9 +55,9 @@ static void double_bit_error_data(void *error_data, void *correct_data,
 {
 	unsigned int offset[2];
 
-	offset[0] = random32() % (size * BITS_PER_BYTE);
+	offset[0] = prandom_u32() % (size * BITS_PER_BYTE);
 	do {
-		offset[1] = random32() % (size * BITS_PER_BYTE);
+		offset[1] = prandom_u32() % (size * BITS_PER_BYTE);
 	} while (offset[0] == offset[1]);
 
 	memcpy(error_data, correct_data, size);
@@ -68,7 +68,7 @@ static void double_bit_error_data(void *error_data, void *correct_data,
 
 static unsigned int random_ecc_bit(size_t size)
 {
-	unsigned int offset = random32() % (3 * BITS_PER_BYTE);
+	unsigned int offset = prandom_u32() % (3 * BITS_PER_BYTE);
 
 	if (size == 256) {
 		/*
@@ -76,7 +76,7 @@ static unsigned int random_ecc_bit(size_t size)
 		 * and 17th bit) in ECC code for 256 byte data block
 		 */
 		while (offset == 16 || offset == 17)
-			offset = random32() % (3 * BITS_PER_BYTE);
+			offset = prandom_u32() % (3 * BITS_PER_BYTE);
 	}
 
 	return offset;

drivers/mtd/tests/mtd_stresstest.c

@@ -55,7 +55,7 @@ static int rand_eb(void)
 	unsigned int eb;
 
 again:
-	eb = random32();
+	eb = prandom_u32();
 	/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
 	eb %= (ebcnt - 1);
 	if (bbt[eb])
@@ -67,7 +67,7 @@ static int rand_offs(void)
 {
 	unsigned int offs;
 
-	offs = random32();
+	offs = prandom_u32();
 	offs %= bufsize;
 	return offs;
 }
@@ -76,7 +76,7 @@ static int rand_len(int offs)
 {
 	unsigned int len;
 
-	len = random32();
+	len = prandom_u32();
 	len %= (bufsize - offs);
 	return len;
 }
@@ -191,7 +191,7 @@ static int do_write(void)
 
 static int do_operation(void)
 {
-	if (random32() & 1)
+	if (prandom_u32() & 1)
 		return do_read();
 	else
 		return do_write();

drivers/mtd/tests/mtd_torturetest.c

@@ -208,7 +208,7 @@ static inline int write_pattern(int ebnum, void *buf)
 static int __init tort_init(void)
 {
 	int err = 0, i, infinite = !cycles_count;
-	int bad_ebs[ebcnt];
+	int *bad_ebs;
 
 	printk(KERN_INFO "\n");
 	printk(KERN_INFO "=================================================\n");
@@ -250,28 +250,24 @@ static int __init tort_init(void)
 
 	err = -ENOMEM;
 	patt_5A5 = kmalloc(mtd->erasesize, GFP_KERNEL);
-	if (!patt_5A5) {
-		pr_err("error: cannot allocate memory\n");
+	if (!patt_5A5)
 		goto out_mtd;
-	}
 
 	patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL);
-	if (!patt_A5A) {
-		pr_err("error: cannot allocate memory\n");
+	if (!patt_A5A)
 		goto out_patt_5A5;
-	}
 
 	patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL);
-	if (!patt_FF) {
-		pr_err("error: cannot allocate memory\n");
+	if (!patt_FF)
 		goto out_patt_A5A;
-	}
 
 	check_buf = kmalloc(mtd->erasesize, GFP_KERNEL);
-	if (!check_buf) {
-		pr_err("error: cannot allocate memory\n");
+	if (!check_buf)
 		goto out_patt_FF;
-	}
+
+	bad_ebs = kcalloc(ebcnt, sizeof(*bad_ebs), GFP_KERNEL);
+	if (!bad_ebs)
+		goto out_check_buf;
 
 	err = 0;
 
@@ -290,7 +286,6 @@ static int __init tort_init(void)
 	/*
 	 * Check if there is a bad eraseblock among those we are going to test.
 	 */
-	memset(&bad_ebs[0], 0, sizeof(int) * ebcnt);
 	if (mtd_can_have_bb(mtd)) {
 		for (i = eb; i < eb + ebcnt; i++) {
 			err = mtd_block_isbad(mtd, (loff_t)i * mtd->erasesize);
@@ -394,6 +389,8 @@ out:
 
 	pr_info("finished after %u erase cycles\n",
 	       erase_cycles);
+	kfree(bad_ebs);
+out_check_buf:
 	kfree(check_buf);
 out_patt_FF:
 	kfree(patt_FF);

drivers/mtd/ubi/debug.h

@@ -86,7 +86,7 @@ static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
 static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
 {
 	if (ubi->dbg.emulate_bitflips)
-		return !(random32() % 200);
+		return !(prandom_u32() % 200);
 	return 0;
 }
 
@@ -100,7 +100,7 @@ static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
 static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
 {
 	if (ubi->dbg.emulate_io_failures)
-		return !(random32() % 500);
+		return !(prandom_u32() % 500);
 	return 0;
 }
 
@@ -114,7 +114,7 @@ static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
 static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
 {
 	if (ubi->dbg.emulate_io_failures)
-		return !(random32() % 400);
+		return !(prandom_u32() % 400);
 	return 0;
 }
 

include/linux/bcma/bcma_driver_chipcommon.h

@@ -528,6 +528,7 @@ struct bcma_sflash {
 	u32 size;
 
 	struct mtd_info *mtd;
+	void *priv;
 };
 #endif
 

include/linux/mtd/map.h

@@ -245,6 +245,7 @@ struct map_info {
 	unsigned long pfow_base;
 	unsigned long map_priv_1;
 	unsigned long map_priv_2;
+	struct device_node *device_node;
 	void *fldrv_priv;
 	struct mtd_chip_driver *fldrv;
 };
@@ -328,7 +329,7 @@ static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word
 
 static inline map_word map_word_load(struct map_info *map, const void *ptr)
 {
-	map_word r = {{0} };
+	map_word r;
 
 	if (map_bankwidth_is_1(map))
 		r.x[0] = *(unsigned char *)ptr;
@@ -342,6 +343,8 @@ static inline map_word map_word_load(struct map_info *map, const void *ptr)
 #endif
 	else if (map_bankwidth_is_large(map))
 		memcpy(r.x, ptr, map->bankwidth);
+	else
+		BUG();
 
 	return r;
 }
@@ -391,7 +394,7 @@ static inline map_word map_word_ff(struct map_info *map)
 
 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
 {
-	map_word uninitialized_var(r);
+	map_word r;
 
 	if (map_bankwidth_is_1(map))
 		r.x[0] = __raw_readb(map->virt + ofs);
@@ -425,6 +428,8 @@ static inline void inline_map_write(struct map_info *map, const map_word datum,
 #endif
 	else if (map_bankwidth_is_large(map))
 		memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
+	else
+		BUG();
 	mb();
 }
 

include/linux/platform_data/elm.h

@@ -0,0 +1,54 @@
+/*
+ * BCH Error Location Module
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __ELM_H
+#define __ELM_H
+
+enum bch_ecc {
+	BCH4_ECC = 0,
+	BCH8_ECC,
+};
+
+/* ELM support 8 error syndrome process */
+#define ERROR_VECTOR_MAX		8
+
+#define BCH8_ECC_OOB_BYTES		13
+#define BCH4_ECC_OOB_BYTES		7
+/* RBL requires 14 byte even though BCH8 uses only 13 byte */
+#define BCH8_SIZE			(BCH8_ECC_OOB_BYTES + 1)
+/* Uses 1 extra byte to handle erased pages */
+#define BCH4_SIZE			(BCH4_ECC_OOB_BYTES + 1)
+
+/**
+ * struct elm_errorvec - error vector for elm
+ * @error_reported:		set true for vectors error is reported
+ * @error_uncorrectable:	number of uncorrectable errors
+ * @error_count:		number of correctable errors in the sector
+ * @error_loc:			buffer for error location
+ *
+ */
+struct elm_errorvec {
+	bool error_reported;
+	bool error_uncorrectable;
+	int error_count;
+	int error_loc[ERROR_VECTOR_MAX];
+};
+
+void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
+		struct elm_errorvec *err_vec);
+void elm_config(struct device *dev, enum bch_ecc bch_type);
+#endif /* __ELM_H */