Linux-libre 4.2-gnu

23 files changed, 2860 insertions, 99 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 5897d8d8f..5b2806a7e 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -76,7 +76,7 @@ config MTD_NAND_DENALI_SCRATCH_REG_ADDR
 
 config MTD_NAND_GPIO
 	tristate "GPIO assisted NAND Flash driver"
-	depends on GPIOLIB
+	depends on GPIOLIB || COMPILE_TEST
 	help
 	  This enables a NAND flash driver where control signals are
 	  connected to GPIO pins, and commands and data are communicated
@@ -394,6 +394,14 @@ config MTD_NAND_GPMI_NAND
 	 block, such as SD card. So pay attention to it when you enable
 	 the GPMI.
 
+config MTD_NAND_BRCMNAND
+	tristate "Broadcom STB NAND controller"
+	depends on ARM || MIPS
+	help
+	  Enables the Broadcom NAND controller driver. The controller was
+	  originally designed for Set-Top Box but is used on various BCM7xxx,
+	  BCM3xxx, BCM63xxx, iProc/Cygnus and more.
+
 config MTD_NAND_BCM47XXNFLASH
 	tristate "Support for NAND flash on BCM4706 BCMA bus"
 	depends on BCMA_NFLASH
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 582bbd05a..1f897ec3c 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -52,5 +52,6 @@ obj-$(CONFIG_MTD_NAND_XWAY)		+= xway_nand.o
 obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)	+= bcm47xxnflash/
 obj-$(CONFIG_MTD_NAND_SUNXI)		+= sunxi_nand.o
 obj-$(CONFIG_MTD_NAND_HISI504)	        += hisi504_nand.o
+obj-$(CONFIG_MTD_NAND_BRCMNAND)		+= brcmnand/
 
 nand-objs := nand_base.o nand_bbt.o nand_timings.o
diff --git a/drivers/mtd/nand/brcmnand/Makefile b/drivers/mtd/nand/brcmnand/Makefile
new file mode 100644
index 000000000..3b1fbfd27
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/Makefile
@@ -0,0 +1,6 @@
+# link order matters; don't link the more generic brcmstb_nand.o before the
+# more specific iproc_nand.o, for instance
+obj-$(CONFIG_MTD_NAND_BRCMNAND)		+= iproc_nand.o
+obj-$(CONFIG_MTD_NAND_BRCMNAND)		+= bcm63138_nand.o
+obj-$(CONFIG_MTD_NAND_BRCMNAND)		+= brcmstb_nand.o
+obj-$(CONFIG_MTD_NAND_BRCMNAND)		+= brcmnand.o
diff --git a/drivers/mtd/nand/brcmnand/bcm63138_nand.c b/drivers/mtd/nand/brcmnand/bcm63138_nand.c
new file mode 100644
index 000000000..3f4c44c24
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/bcm63138_nand.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright © 2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/device.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "brcmnand.h"
+
+struct bcm63138_nand_soc_priv {
+	void __iomem *base;
+};
+
+#define BCM63138_NAND_INT_STATUS		0x00
+#define BCM63138_NAND_INT_EN			0x04
+
+enum {
+	BCM63138_CTLRDY		= BIT(4),
+};
+
+static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc)
+{
+	struct bcm63138_nand_soc_priv *priv = soc->priv;
+	void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS;
+	u32 val = brcmnand_readl(mmio);
+
+	if (val & BCM63138_CTLRDY) {
+		brcmnand_writel(val & ~BCM63138_CTLRDY, mmio);
+		return true;
+	}
+
+	return false;
+}
+
+static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en)
+{
+	struct bcm63138_nand_soc_priv *priv = soc->priv;
+	void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN;
+	u32 val = brcmnand_readl(mmio);
+
+	if (en)
+		val |= BCM63138_CTLRDY;
+	else
+		val &= ~BCM63138_CTLRDY;
+
+	brcmnand_writel(val, mmio);
+}
+
+static int bcm63138_nand_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct bcm63138_nand_soc_priv *priv;
+	struct brcmnand_soc *soc;
+	struct resource *res;
+
+	soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL);
+	if (!soc)
+		return -ENOMEM;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-int-base");
+	priv->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	soc->pdev = pdev;
+	soc->priv = priv;
+	soc->ctlrdy_ack = bcm63138_nand_intc_ack;
+	soc->ctlrdy_set_enabled = bcm63138_nand_intc_set;
+
+	return brcmnand_probe(pdev, soc);
+}
+
+static const struct of_device_id bcm63138_nand_of_match[] = {
+	{ .compatible = "brcm,nand-bcm63138" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
+
+static struct platform_driver bcm63138_nand_driver = {
+	.probe			= bcm63138_nand_probe,
+	.remove			= brcmnand_remove,
+	.driver = {
+		.name		= "bcm63138_nand",
+		.pm		= &brcmnand_pm_ops,
+		.of_match_table	= bcm63138_nand_of_match,
+	}
+};
+module_platform_driver(bcm63138_nand_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Brian Norris");
+MODULE_DESCRIPTION("NAND driver for BCM63138");
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
new file mode 100644
index 000000000..fddb795ee
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -0,0 +1,2246 @@
+/*
+ * Copyright © 2010-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/dma-mapping.h>
+#include <linux/ioport.h>
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/mm.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/of.h>
+#include <linux/of_mtd.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/log2.h>
+
+#include "brcmnand.h"
+
+/*
+ * This flag controls if WP stays on between erase/write commands to mitigate
+ * flash corruption due to power glitches. Values:
+ * 0: NAND_WP is not used or not available
+ * 1: NAND_WP is set by default, cleared for erase/write operations
+ * 2: NAND_WP is always cleared
+ */
+static int wp_on = 1;
+module_param(wp_on, int, 0444);
+
+/***********************************************************************
+ * Definitions
+ ***********************************************************************/
+
+#define DRV_NAME			"brcmnand"
+
+#define CMD_NULL			0x00
+#define CMD_PAGE_READ			0x01
+#define CMD_SPARE_AREA_READ		0x02
+#define CMD_STATUS_READ			0x03
+#define CMD_PROGRAM_PAGE		0x04
+#define CMD_PROGRAM_SPARE_AREA		0x05
+#define CMD_COPY_BACK			0x06
+#define CMD_DEVICE_ID_READ		0x07
+#define CMD_BLOCK_ERASE			0x08
+#define CMD_FLASH_RESET			0x09
+#define CMD_BLOCKS_LOCK			0x0a
+#define CMD_BLOCKS_LOCK_DOWN		0x0b
+#define CMD_BLOCKS_UNLOCK		0x0c
+#define CMD_READ_BLOCKS_LOCK_STATUS	0x0d
+#define CMD_PARAMETER_READ		0x0e
+#define CMD_PARAMETER_CHANGE_COL	0x0f
+#define CMD_LOW_LEVEL_OP		0x10
+
+struct brcm_nand_dma_desc {
+	u32 next_desc;
+	u32 next_desc_ext;
+	u32 cmd_irq;
+	u32 dram_addr;
+	u32 dram_addr_ext;
+	u32 tfr_len;
+	u32 total_len;
+	u32 flash_addr;
+	u32 flash_addr_ext;
+	u32 cs;
+	u32 pad2[5];
+	u32 status_valid;
+} __packed;
+
+/* Bitfields for brcm_nand_dma_desc::status_valid */
+#define FLASH_DMA_ECC_ERROR	(1 << 8)
+#define FLASH_DMA_CORR_ERROR	(1 << 9)
+
+/* 512B flash cache in the NAND controller HW */
+#define FC_SHIFT		9U
+#define FC_BYTES		512U
+#define FC_WORDS		(FC_BYTES >> 2)
+
+#define BRCMNAND_MIN_PAGESIZE	512
+#define BRCMNAND_MIN_BLOCKSIZE	(8 * 1024)
+#define BRCMNAND_MIN_DEVSIZE	(4ULL * 1024 * 1024)
+
+/* Controller feature flags */
+enum {
+	BRCMNAND_HAS_1K_SECTORS			= BIT(0),
+	BRCMNAND_HAS_PREFETCH			= BIT(1),
+	BRCMNAND_HAS_CACHE_MODE			= BIT(2),
+	BRCMNAND_HAS_WP				= BIT(3),
+};
+
+struct brcmnand_controller {
+	struct device		*dev;
+	struct nand_hw_control	controller;
+	void __iomem		*nand_base;
+	void __iomem		*nand_fc; /* flash cache */
+	void __iomem		*flash_dma_base;
+	unsigned int		irq;
+	unsigned int		dma_irq;
+	int			nand_version;
+
+	/* Some SoCs provide custom interrupt status register(s) */
+	struct brcmnand_soc	*soc;
+
+	int			cmd_pending;
+	bool			dma_pending;
+	struct completion	done;
+	struct completion	dma_done;
+
+	/* List of NAND hosts (one for each chip-select) */
+	struct list_head host_list;
+
+	struct brcm_nand_dma_desc *dma_desc;
+	dma_addr_t		dma_pa;
+
+	/* in-memory cache of the FLASH_CACHE, used only for some commands */
+	u32			flash_cache[FC_WORDS];
+
+	/* Controller revision details */
+	const u16		*reg_offsets;
+	unsigned int		reg_spacing; /* between CS1, CS2, ... regs */
+	const u8		*cs_offsets; /* within each chip-select */
+	const u8		*cs0_offsets; /* within CS0, if different */
+	unsigned int		max_block_size;
+	const unsigned int	*block_sizes;
+	unsigned int		max_page_size;
+	const unsigned int	*page_sizes;
+	unsigned int		max_oob;
+	u32			features;
+
+	/* for low-power standby/resume only */
+	u32			nand_cs_nand_select;
+	u32			nand_cs_nand_xor;
+	u32			corr_stat_threshold;
+	u32			flash_dma_mode;
+};
+
+struct brcmnand_cfg {
+	u64			device_size;
+	unsigned int		block_size;
+	unsigned int		page_size;
+	unsigned int		spare_area_size;
+	unsigned int		device_width;
+	unsigned int		col_adr_bytes;
+	unsigned int		blk_adr_bytes;
+	unsigned int		ful_adr_bytes;
+	unsigned int		sector_size_1k;
+	unsigned int		ecc_level;
+	/* use for low-power standby/resume only */
+	u32			acc_control;
+	u32			config;
+	u32			config_ext;
+	u32			timing_1;
+	u32			timing_2;
+};
+
+struct brcmnand_host {
+	struct list_head	node;
+	struct device_node	*of_node;
+
+	struct nand_chip	chip;
+	struct mtd_info		mtd;
+	struct platform_device	*pdev;
+	int			cs;
+
+	unsigned int		last_cmd;
+	unsigned int		last_byte;
+	u64			last_addr;
+	struct brcmnand_cfg	hwcfg;
+	struct brcmnand_controller *ctrl;
+};
+
+enum brcmnand_reg {
+	BRCMNAND_CMD_START = 0,
+	BRCMNAND_CMD_EXT_ADDRESS,
+	BRCMNAND_CMD_ADDRESS,
+	BRCMNAND_INTFC_STATUS,
+	BRCMNAND_CS_SELECT,
+	BRCMNAND_CS_XOR,
+	BRCMNAND_LL_OP,
+	BRCMNAND_CS0_BASE,
+	BRCMNAND_CS1_BASE,		/* CS1 regs, if non-contiguous */
+	BRCMNAND_CORR_THRESHOLD,
+	BRCMNAND_CORR_THRESHOLD_EXT,
+	BRCMNAND_UNCORR_COUNT,
+	BRCMNAND_CORR_COUNT,
+	BRCMNAND_CORR_EXT_ADDR,
+	BRCMNAND_CORR_ADDR,
+	BRCMNAND_UNCORR_EXT_ADDR,
+	BRCMNAND_UNCORR_ADDR,
+	BRCMNAND_SEMAPHORE,
+	BRCMNAND_ID,
+	BRCMNAND_ID_EXT,
+	BRCMNAND_LL_RDATA,
+	BRCMNAND_OOB_READ_BASE,
+	BRCMNAND_OOB_READ_10_BASE,	/* offset 0x10, if non-contiguous */
+	BRCMNAND_OOB_WRITE_BASE,
+	BRCMNAND_OOB_WRITE_10_BASE,	/* offset 0x10, if non-contiguous */
+	BRCMNAND_FC_BASE,
+};
+
+/* BRCMNAND v4.0 */
+static const u16 brcmnand_regs_v40[] = {
+	[BRCMNAND_CMD_START]		=  0x04,
+	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
+	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
+	[BRCMNAND_INTFC_STATUS]		=  0x6c,
+	[BRCMNAND_CS_SELECT]		=  0x14,
+	[BRCMNAND_CS_XOR]		=  0x18,
+	[BRCMNAND_LL_OP]		= 0x178,
+	[BRCMNAND_CS0_BASE]		=  0x40,
+	[BRCMNAND_CS1_BASE]		=  0xd0,
+	[BRCMNAND_CORR_THRESHOLD]	=  0x84,
+	[BRCMNAND_CORR_THRESHOLD_EXT]	=     0,
+	[BRCMNAND_UNCORR_COUNT]		=     0,
+	[BRCMNAND_CORR_COUNT]		=     0,
+	[BRCMNAND_CORR_EXT_ADDR]	=  0x70,
+	[BRCMNAND_CORR_ADDR]		=  0x74,
+	[BRCMNAND_UNCORR_EXT_ADDR]	=  0x78,
+	[BRCMNAND_UNCORR_ADDR]		=  0x7c,
+	[BRCMNAND_SEMAPHORE]		=  0x58,
+	[BRCMNAND_ID]			=  0x60,
+	[BRCMNAND_ID_EXT]		=  0x64,
+	[BRCMNAND_LL_RDATA]		= 0x17c,
+	[BRCMNAND_OOB_READ_BASE]	=  0x20,
+	[BRCMNAND_OOB_READ_10_BASE]	= 0x130,
+	[BRCMNAND_OOB_WRITE_BASE]	=  0x30,
+	[BRCMNAND_OOB_WRITE_10_BASE]	=     0,
+	[BRCMNAND_FC_BASE]		= 0x200,
+};
+
+/* BRCMNAND v5.0 */
+static const u16 brcmnand_regs_v50[] = {
+	[BRCMNAND_CMD_START]		=  0x04,
+	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
+	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
+	[BRCMNAND_INTFC_STATUS]		=  0x6c,
+	[BRCMNAND_CS_SELECT]		=  0x14,
+	[BRCMNAND_CS_XOR]		=  0x18,
+	[BRCMNAND_LL_OP]		= 0x178,
+	[BRCMNAND_CS0_BASE]		=  0x40,
+	[BRCMNAND_CS1_BASE]		=  0xd0,
+	[BRCMNAND_CORR_THRESHOLD]	=  0x84,
+	[BRCMNAND_CORR_THRESHOLD_EXT]	=     0,
+	[BRCMNAND_UNCORR_COUNT]		=     0,
+	[BRCMNAND_CORR_COUNT]		=     0,
+	[BRCMNAND_CORR_EXT_ADDR]	=  0x70,
+	[BRCMNAND_CORR_ADDR]		=  0x74,
+	[BRCMNAND_UNCORR_EXT_ADDR]	=  0x78,
+	[BRCMNAND_UNCORR_ADDR]		=  0x7c,
+	[BRCMNAND_SEMAPHORE]		=  0x58,
+	[BRCMNAND_ID]			=  0x60,
+	[BRCMNAND_ID_EXT]		=  0x64,
+	[BRCMNAND_LL_RDATA]		= 0x17c,
+	[BRCMNAND_OOB_READ_BASE]	=  0x20,
+	[BRCMNAND_OOB_READ_10_BASE]	= 0x130,
+	[BRCMNAND_OOB_WRITE_BASE]	=  0x30,
+	[BRCMNAND_OOB_WRITE_10_BASE]	= 0x140,
+	[BRCMNAND_FC_BASE]		= 0x200,
+};
+
+/* BRCMNAND v6.0 - v7.1 */
+static const u16 brcmnand_regs_v60[] = {
+	[BRCMNAND_CMD_START]		=  0x04,
+	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
+	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
+	[BRCMNAND_INTFC_STATUS]		=  0x14,
+	[BRCMNAND_CS_SELECT]		=  0x18,
+	[BRCMNAND_CS_XOR]		=  0x1c,
+	[BRCMNAND_LL_OP]		=  0x20,
+	[BRCMNAND_CS0_BASE]		=  0x50,
+	[BRCMNAND_CS1_BASE]		=     0,
+	[BRCMNAND_CORR_THRESHOLD]	=  0xc0,
+	[BRCMNAND_CORR_THRESHOLD_EXT]	=  0xc4,
+	[BRCMNAND_UNCORR_COUNT]		=  0xfc,
+	[BRCMNAND_CORR_COUNT]		= 0x100,
+	[BRCMNAND_CORR_EXT_ADDR]	= 0x10c,
+	[BRCMNAND_CORR_ADDR]		= 0x110,
+	[BRCMNAND_UNCORR_EXT_ADDR]	= 0x114,
+	[BRCMNAND_UNCORR_ADDR]		= 0x118,
+	[BRCMNAND_SEMAPHORE]		= 0x150,
+	[BRCMNAND_ID]			= 0x194,
+	[BRCMNAND_ID_EXT]		= 0x198,
+	[BRCMNAND_LL_RDATA]		= 0x19c,
+	[BRCMNAND_OOB_READ_BASE]	= 0x200,
+	[BRCMNAND_OOB_READ_10_BASE]	=     0,
+	[BRCMNAND_OOB_WRITE_BASE]	= 0x280,
+	[BRCMNAND_OOB_WRITE_10_BASE]	=     0,
+	[BRCMNAND_FC_BASE]		= 0x400,
+};
+
+enum brcmnand_cs_reg {
+	BRCMNAND_CS_CFG_EXT = 0,
+	BRCMNAND_CS_CFG,
+	BRCMNAND_CS_ACC_CONTROL,
+	BRCMNAND_CS_TIMING1,
+	BRCMNAND_CS_TIMING2,
+};
+
+/* Per chip-select offsets for v7.1 */
+static const u8 brcmnand_cs_offsets_v71[] = {
+	[BRCMNAND_CS_ACC_CONTROL]	= 0x00,
+	[BRCMNAND_CS_CFG_EXT]		= 0x04,
+	[BRCMNAND_CS_CFG]		= 0x08,
+	[BRCMNAND_CS_TIMING1]		= 0x0c,
+	[BRCMNAND_CS_TIMING2]		= 0x10,
+};
+
+/* Per chip-select offsets for pre v7.1, except CS0 on <= v5.0 */
+static const u8 brcmnand_cs_offsets[] = {
+	[BRCMNAND_CS_ACC_CONTROL]	= 0x00,
+	[BRCMNAND_CS_CFG_EXT]		= 0x04,
+	[BRCMNAND_CS_CFG]		= 0x04,
+	[BRCMNAND_CS_TIMING1]		= 0x08,
+	[BRCMNAND_CS_TIMING2]		= 0x0c,
+};
+
+/* Per chip-select offset for <= v5.0 on CS0 only */
+static const u8 brcmnand_cs_offsets_cs0[] = {
+	[BRCMNAND_CS_ACC_CONTROL]	= 0x00,
+	[BRCMNAND_CS_CFG_EXT]		= 0x08,
+	[BRCMNAND_CS_CFG]		= 0x08,
+	[BRCMNAND_CS_TIMING1]		= 0x10,
+	[BRCMNAND_CS_TIMING2]		= 0x14,
+};
+
+/* BRCMNAND_INTFC_STATUS */
+enum {
+	INTFC_FLASH_STATUS		= GENMASK(7, 0),
+
+	INTFC_ERASED			= BIT(27),
+	INTFC_OOB_VALID			= BIT(28),
+	INTFC_CACHE_VALID		= BIT(29),
+	INTFC_FLASH_READY		= BIT(30),
+	INTFC_CTLR_READY		= BIT(31),
+};
+
+static inline u32 nand_readreg(struct brcmnand_controller *ctrl, u32 offs)
+{
+	return brcmnand_readl(ctrl->nand_base + offs);
+}
+
+static inline void nand_writereg(struct brcmnand_controller *ctrl, u32 offs,
+				 u32 val)
+{
+	brcmnand_writel(val, ctrl->nand_base + offs);
+}
+
+static int brcmnand_revision_init(struct brcmnand_controller *ctrl)
+{
+	static const unsigned int block_sizes_v6[] = { 8, 16, 128, 256, 512, 1024, 2048, 0 };
+	static const unsigned int block_sizes_v4[] = { 16, 128, 8, 512, 256, 1024, 2048, 0 };
+	static const unsigned int page_sizes[] = { 512, 2048, 4096, 8192, 0 };
+
+	ctrl->nand_version = nand_readreg(ctrl, 0) & 0xffff;
+
+	/* Only support v4.0+? */
+	if (ctrl->nand_version < 0x0400) {
+		dev_err(ctrl->dev, "version %#x not supported\n",
+			ctrl->nand_version);
+		return -ENODEV;
+	}
+
+	/* Register offsets */
+	if (ctrl->nand_version >= 0x0600)
+		ctrl->reg_offsets = brcmnand_regs_v60;
+	else if (ctrl->nand_version >= 0x0500)
+		ctrl->reg_offsets = brcmnand_regs_v50;
+	else if (ctrl->nand_version >= 0x0400)
+		ctrl->reg_offsets = brcmnand_regs_v40;
+
+	/* Chip-select stride */
+	if (ctrl->nand_version >= 0x0701)
+		ctrl->reg_spacing = 0x14;
+	else
+		ctrl->reg_spacing = 0x10;
+
+	/* Per chip-select registers */
+	if (ctrl->nand_version >= 0x0701) {
+		ctrl->cs_offsets = brcmnand_cs_offsets_v71;
+	} else {
+		ctrl->cs_offsets = brcmnand_cs_offsets;
+
+		/* v5.0 and earlier has a different CS0 offset layout */
+		if (ctrl->nand_version <= 0x0500)
+			ctrl->cs0_offsets = brcmnand_cs_offsets_cs0;
+	}
+
+	/* Page / block sizes */
+	if (ctrl->nand_version >= 0x0701) {
+		/* >= v7.1 use nice power-of-2 values! */
+		ctrl->max_page_size = 16 * 1024;
+		ctrl->max_block_size = 2 * 1024 * 1024;
+	} else {
+		ctrl->page_sizes = page_sizes;
+		if (ctrl->nand_version >= 0x0600)
+			ctrl->block_sizes = block_sizes_v6;
+		else
+			ctrl->block_sizes = block_sizes_v4;
+
+		if (ctrl->nand_version < 0x0400) {
+			ctrl->max_page_size = 4096;
+			ctrl->max_block_size = 512 * 1024;
+		}
+	}
+
+	/* Maximum spare area sector size (per 512B) */
+	if (ctrl->nand_version >= 0x0600)
+		ctrl->max_oob = 64;
+	else if (ctrl->nand_version >= 0x0500)
+		ctrl->max_oob = 32;
+	else
+		ctrl->max_oob = 16;
+
+	/* v6.0 and newer (except v6.1) have prefetch support */
+	if (ctrl->nand_version >= 0x0600 && ctrl->nand_version != 0x0601)
+		ctrl->features |= BRCMNAND_HAS_PREFETCH;
+
+	/*
+	 * v6.x has cache mode, but it's implemented differently. Ignore it for
+	 * now.
+	 */
+	if (ctrl->nand_version >= 0x0700)
+		ctrl->features |= BRCMNAND_HAS_CACHE_MODE;
+
+	if (ctrl->nand_version >= 0x0500)
+		ctrl->features |= BRCMNAND_HAS_1K_SECTORS;
+
+	if (ctrl->nand_version >= 0x0700)
+		ctrl->features |= BRCMNAND_HAS_WP;
+	else if (of_property_read_bool(ctrl->dev->of_node, "brcm,nand-has-wp"))
+		ctrl->features |= BRCMNAND_HAS_WP;
+
+	return 0;
+}
+
+static inline u32 brcmnand_read_reg(struct brcmnand_controller *ctrl,
+		enum brcmnand_reg reg)
+{
+	u16 offs = ctrl->reg_offsets[reg];
+
+	if (offs)
+		return nand_readreg(ctrl, offs);
+	else
+		return 0;
+}
+
+static inline void brcmnand_write_reg(struct brcmnand_controller *ctrl,
+				      enum brcmnand_reg reg, u32 val)
+{
+	u16 offs = ctrl->reg_offsets[reg];
+
+	if (offs)
+		nand_writereg(ctrl, offs, val);
+}
+
+static inline void brcmnand_rmw_reg(struct brcmnand_controller *ctrl,
+				    enum brcmnand_reg reg, u32 mask, unsigned
+				    int shift, u32 val)
+{
+	u32 tmp = brcmnand_read_reg(ctrl, reg);
+
+	tmp &= ~mask;
+	tmp |= val << shift;
+	brcmnand_write_reg(ctrl, reg, tmp);
+}
+
+static inline u32 brcmnand_read_fc(struct brcmnand_controller *ctrl, int word)
+{
+	return __raw_readl(ctrl->nand_fc + word * 4);
+}
+
+static inline void brcmnand_write_fc(struct brcmnand_controller *ctrl,
+				     int word, u32 val)
+{
+	__raw_writel(val, ctrl->nand_fc + word * 4);
+}
+
+static inline u16 brcmnand_cs_offset(struct brcmnand_controller *ctrl, int cs,
+				     enum brcmnand_cs_reg reg)
+{
+	u16 offs_cs0 = ctrl->reg_offsets[BRCMNAND_CS0_BASE];
+	u16 offs_cs1 = ctrl->reg_offsets[BRCMNAND_CS1_BASE];
+	u8 cs_offs;
+
+	if (cs == 0 && ctrl->cs0_offsets)
+		cs_offs = ctrl->cs0_offsets[reg];
+	else
+		cs_offs = ctrl->cs_offsets[reg];
+
+	if (cs && offs_cs1)
+		return offs_cs1 + (cs - 1) * ctrl->reg_spacing + cs_offs;
+
+	return offs_cs0 + cs * ctrl->reg_spacing + cs_offs;
+}
+
+static inline u32 brcmnand_count_corrected(struct brcmnand_controller *ctrl)
+{
+	if (ctrl->nand_version < 0x0600)
+		return 1;
+	return brcmnand_read_reg(ctrl, BRCMNAND_CORR_COUNT);
+}
+
+static void brcmnand_wr_corr_thresh(struct brcmnand_host *host, u8 val)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	unsigned int shift = 0, bits;
+	enum brcmnand_reg reg = BRCMNAND_CORR_THRESHOLD;
+	int cs = host->cs;
+
+	if (ctrl->nand_version >= 0x0600)
+		bits = 6;
+	else if (ctrl->nand_version >= 0x0500)
+		bits = 5;
+	else
+		bits = 4;
+
+	if (ctrl->nand_version >= 0x0600) {
+		if (cs >= 5)
+			reg = BRCMNAND_CORR_THRESHOLD_EXT;
+		shift = (cs % 5) * bits;
+	}
+	brcmnand_rmw_reg(ctrl, reg, (bits - 1) << shift, shift, val);
+}
+
+static inline int brcmnand_cmd_shift(struct brcmnand_controller *ctrl)
+{
+	if (ctrl->nand_version < 0x0700)
+		return 24;
+	return 0;
+}
+
+/***********************************************************************
+ * NAND ACC CONTROL bitfield
+ *
+ * Some bits have remained constant throughout hardware revision, while
+ * others have shifted around.
+ ***********************************************************************/
+
+/* Constant for all versions (where supported) */
+enum {
+	/* See BRCMNAND_HAS_CACHE_MODE */
+	ACC_CONTROL_CACHE_MODE				= BIT(22),
+
+	/* See BRCMNAND_HAS_PREFETCH */
+	ACC_CONTROL_PREFETCH				= BIT(23),
+
+	ACC_CONTROL_PAGE_HIT				= BIT(24),
+	ACC_CONTROL_WR_PREEMPT				= BIT(25),
+	ACC_CONTROL_PARTIAL_PAGE			= BIT(26),
+	ACC_CONTROL_RD_ERASED				= BIT(27),
+	ACC_CONTROL_FAST_PGM_RDIN			= BIT(28),
+	ACC_CONTROL_WR_ECC				= BIT(30),
+	ACC_CONTROL_RD_ECC				= BIT(31),
+};
+
+static inline u32 brcmnand_spare_area_mask(struct brcmnand_controller *ctrl)
+{
+	if (ctrl->nand_version >= 0x0600)
+		return GENMASK(6, 0);
+	else
+		return GENMASK(5, 0);
+}
+
+#define NAND_ACC_CONTROL_ECC_SHIFT	16
+
+static inline u32 brcmnand_ecc_level_mask(struct brcmnand_controller *ctrl)
+{
+	u32 mask = (ctrl->nand_version >= 0x0600) ? 0x1f : 0x0f;
+
+	return mask << NAND_ACC_CONTROL_ECC_SHIFT;
+}
+
+static void brcmnand_set_ecc_enabled(struct brcmnand_host *host, int en)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	u16 offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL);
+	u32 acc_control = nand_readreg(ctrl, offs);
+	u32 ecc_flags = ACC_CONTROL_WR_ECC | ACC_CONTROL_RD_ECC;
+
+	if (en) {
+		acc_control |= ecc_flags; /* enable RD/WR ECC */
+		acc_control |= host->hwcfg.ecc_level
+			       << NAND_ACC_CONTROL_ECC_SHIFT;
+	} else {
+		acc_control &= ~ecc_flags; /* disable RD/WR ECC */
+		acc_control &= ~brcmnand_ecc_level_mask(ctrl);
+	}
+
+	nand_writereg(ctrl, offs, acc_control);
+}
+
+static inline int brcmnand_sector_1k_shift(struct brcmnand_controller *ctrl)
+{
+	if (ctrl->nand_version >= 0x0600)
+		return 7;
+	else if (ctrl->nand_version >= 0x0500)
+		return 6;
+	else
+		return -1;
+}
+
+static int brcmnand_get_sector_size_1k(struct brcmnand_host *host)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	int shift = brcmnand_sector_1k_shift(ctrl);
+	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
+						  BRCMNAND_CS_ACC_CONTROL);
+
+	if (shift < 0)
+		return 0;
+
+	return (nand_readreg(ctrl, acc_control_offs) >> shift) & 0x1;
+}
+
+static void brcmnand_set_sector_size_1k(struct brcmnand_host *host, int val)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	int shift = brcmnand_sector_1k_shift(ctrl);
+	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
+						  BRCMNAND_CS_ACC_CONTROL);
+	u32 tmp;
+
+	if (shift < 0)
+		return;
+
+	tmp = nand_readreg(ctrl, acc_control_offs);
+	tmp &= ~(1 << shift);
+	tmp |= (!!val) << shift;
+	nand_writereg(ctrl, acc_control_offs, tmp);
+}
+
+/***********************************************************************
+ * CS_NAND_SELECT
+ ***********************************************************************/
+
+enum {
+	CS_SELECT_NAND_WP			= BIT(29),
+	CS_SELECT_AUTO_DEVICE_ID_CFG		= BIT(30),
+};
+
+static inline void brcmnand_set_wp(struct brcmnand_controller *ctrl, bool en)
+{
+	u32 val = en ? CS_SELECT_NAND_WP : 0;
+
+	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT, CS_SELECT_NAND_WP, 0, val);
+}
+
+/***********************************************************************
+ * Flash DMA
+ ***********************************************************************/
+
+enum flash_dma_reg {
+	FLASH_DMA_REVISION		= 0x00,
+	FLASH_DMA_FIRST_DESC		= 0x04,
+	FLASH_DMA_FIRST_DESC_EXT	= 0x08,
+	FLASH_DMA_CTRL			= 0x0c,
+	FLASH_DMA_MODE			= 0x10,
+	FLASH_DMA_STATUS		= 0x14,
+	FLASH_DMA_INTERRUPT_DESC	= 0x18,
+	FLASH_DMA_INTERRUPT_DESC_EXT	= 0x1c,
+	FLASH_DMA_ERROR_STATUS		= 0x20,
+	FLASH_DMA_CURRENT_DESC		= 0x24,
+	FLASH_DMA_CURRENT_DESC_EXT	= 0x28,
+};
+
+static inline bool has_flash_dma(struct brcmnand_controller *ctrl)
+{
+	return ctrl->flash_dma_base;
+}
+
+static inline bool flash_dma_buf_ok(const void *buf)
+{
+	return buf && !is_vmalloc_addr(buf) &&
+		likely(IS_ALIGNED((uintptr_t)buf, 4));
+}
+
+static inline void flash_dma_writel(struct brcmnand_controller *ctrl, u8 offs,
+				    u32 val)
+{
+	brcmnand_writel(val, ctrl->flash_dma_base + offs);
+}
+
+static inline u32 flash_dma_readl(struct brcmnand_controller *ctrl, u8 offs)
+{
+	return brcmnand_readl(ctrl->flash_dma_base + offs);
+}
+
+/* Low-level operation types: command, address, write, or read */
+enum brcmnand_llop_type {
+	LL_OP_CMD,
+	LL_OP_ADDR,
+	LL_OP_WR,
+	LL_OP_RD,
+};
+
+/***********************************************************************
+ * Internal support functions
+ ***********************************************************************/
+
+static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg)
+{
+	return cfg->sector_size_1k == 0 && cfg->spare_area_size == 16 &&
+		cfg->ecc_level == 15;
+}
+
+/*
+ * Returns a nand_ecclayout strucutre for the given layout/configuration.
+ * Returns NULL on failure.
+ */
+static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
+						     struct brcmnand_host *host)
+{
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int i, j;
+	struct nand_ecclayout *layout;
+	int req;
+	int sectors;
+	int sas;
+	int idx1, idx2;
+
+	layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL);
+	if (!layout)
+		return NULL;
+
+	sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+	sas = cfg->spare_area_size << cfg->sector_size_1k;
+
+	/* Hamming */
+	if (is_hamming_ecc(cfg)) {
+		for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
+			/* First sector of each page may have BBI */
+			if (i == 0) {
+				layout->oobfree[idx2].offset = i * sas + 1;
+				/* Small-page NAND use byte 6 for BBI */
+				if (cfg->page_size == 512)
+					layout->oobfree[idx2].offset--;
+				layout->oobfree[idx2].length = 5;
+			} else {
+				layout->oobfree[idx2].offset = i * sas;
+				layout->oobfree[idx2].length = 6;
+			}
+			idx2++;
+			layout->eccpos[idx1++] = i * sas + 6;
+			layout->eccpos[idx1++] = i * sas + 7;
+			layout->eccpos[idx1++] = i * sas + 8;
+			layout->oobfree[idx2].offset = i * sas + 9;
+			layout->oobfree[idx2].length = 7;
+			idx2++;
+			/* Leave zero-terminated entry for OOBFREE */
+			if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
+				    idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
+				break;
+		}
+		goto out;
+	}
+
+	/*
+	 * CONTROLLER_VERSION:
+	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
+	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
+	 * But we will just be conservative.
+	 */
+	req = DIV_ROUND_UP(ecc_level * 14, 8);
+	if (req >= sas) {
+		dev_err(&host->pdev->dev,
+			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
+			req, sas);
+		return NULL;
+	}
+
+	layout->eccbytes = req * sectors;
+	for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
+		for (j = sas - req; j < sas && idx1 <
+				MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++)
+			layout->eccpos[idx1] = i * sas + j;
+
+		/* First sector of each page may have BBI */
+		if (i == 0) {
+			if (cfg->page_size == 512 && (sas - req >= 6)) {
+				/* Small-page NAND use byte 6 for BBI */
+				layout->oobfree[idx2].offset = 0;
+				layout->oobfree[idx2].length = 5;
+				idx2++;
+				if (sas - req > 6) {
+					layout->oobfree[idx2].offset = 6;
+					layout->oobfree[idx2].length =
+						sas - req - 6;
+					idx2++;
+				}
+			} else if (sas > req + 1) {
+				layout->oobfree[idx2].offset = i * sas + 1;
+				layout->oobfree[idx2].length = sas - req - 1;
+				idx2++;
+			}
+		} else if (sas > req) {
+			layout->oobfree[idx2].offset = i * sas;
+			layout->oobfree[idx2].length = sas - req;
+			idx2++;
+		}
+		/* Leave zero-terminated entry for OOBFREE */
+		if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
+				idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
+			break;
+	}
+out:
+	/* Sum available OOB */
+	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE; i++)
+		layout->oobavail += layout->oobfree[i].length;
+	return layout;
+}
+
+static struct nand_ecclayout *brcmstb_choose_ecc_layout(
+		struct brcmnand_host *host)
+{
+	struct nand_ecclayout *layout;
+	struct brcmnand_cfg *p = &host->hwcfg;
+	unsigned int ecc_level = p->ecc_level;
+
+	if (p->sector_size_1k)
+		ecc_level <<= 1;
+
+	layout = brcmnand_create_layout(ecc_level, host);
+	if (!layout) {
+		dev_err(&host->pdev->dev,
+				"no proper ecc_layout for this NAND cfg\n");
+		return NULL;
+	}
+
+	return layout;
+}
+
+static void brcmnand_wp(struct mtd_info *mtd, int wp)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct brcmnand_host *host = chip->priv;
+	struct brcmnand_controller *ctrl = host->ctrl;
+
+	if ((ctrl->features & BRCMNAND_HAS_WP) && wp_on == 1) {
+		static int old_wp = -1;
+
+		if (old_wp != wp) {
+			dev_dbg(ctrl->dev, "WP %s\n", wp ? "on" : "off");
+			old_wp = wp;
+		}
+		brcmnand_set_wp(ctrl, wp);
+	}
+}
+
+/* Helper functions for reading and writing OOB registers */
+static inline u8 oob_reg_read(struct brcmnand_controller *ctrl, u32 offs)
+{
+	u16 offset0, offset10, reg_offs;
+
+	offset0 = ctrl->reg_offsets[BRCMNAND_OOB_READ_BASE];
+	offset10 = ctrl->reg_offsets[BRCMNAND_OOB_READ_10_BASE];
+
+	if (offs >= ctrl->max_oob)
+		return 0x77;
+
+	if (offs >= 16 && offset10)
+		reg_offs = offset10 + ((offs - 0x10) & ~0x03);
+	else
+		reg_offs = offset0 + (offs & ~0x03);
+
+	return nand_readreg(ctrl, reg_offs) >> (24 - ((offs & 0x03) << 3));
+}
+
+static inline void oob_reg_write(struct brcmnand_controller *ctrl, u32 offs,
+				 u32 data)
+{
+	u16 offset0, offset10, reg_offs;
+
+	offset0 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_BASE];
+	offset10 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_10_BASE];
+
+	if (offs >= ctrl->max_oob)
+		return;
+
+	if (offs >= 16 && offset10)
+		reg_offs = offset10 + ((offs - 0x10) & ~0x03);
+	else
+		reg_offs = offset0 + (offs & ~0x03);
+
+	nand_writereg(ctrl, reg_offs, data);
+}
+
+/*
+ * read_oob_from_regs - read data from OOB registers
+ * @ctrl: NAND controller
+ * @i: sub-page sector index
+ * @oob: buffer to read to
+ * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE)
+ * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal
+ */
+static int read_oob_from_regs(struct brcmnand_controller *ctrl, int i, u8 *oob,
+			      int sas, int sector_1k)
+{
+	int tbytes = sas << sector_1k;
+	int j;
+
+	/* Adjust OOB values for 1K sector size */
+	if (sector_1k && (i & 0x01))
+		tbytes = max(0, tbytes - (int)ctrl->max_oob);
+	tbytes = min_t(int, tbytes, ctrl->max_oob);
+
+	for (j = 0; j < tbytes; j++)
+		oob[j] = oob_reg_read(ctrl, j);
+	return tbytes;
+}
+
+/*
+ * write_oob_to_regs - write data to OOB registers
+ * @i: sub-page sector index
+ * @oob: buffer to write from
+ * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE)
+ * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal
+ */
+static int write_oob_to_regs(struct brcmnand_controller *ctrl, int i,
+			     const u8 *oob, int sas, int sector_1k)
+{
+	int tbytes = sas << sector_1k;
+	int j;
+
+	/* Adjust OOB values for 1K sector size */
+	if (sector_1k && (i & 0x01))
+		tbytes = max(0, tbytes - (int)ctrl->max_oob);
+	tbytes = min_t(int, tbytes, ctrl->max_oob);
+
+	for (j = 0; j < tbytes; j += 4)
+		oob_reg_write(ctrl, j,
+				(oob[j + 0] << 24) |
+				(oob[j + 1] << 16) |
+				(oob[j + 2] <<  8) |
+				(oob[j + 3] <<  0));
+	return tbytes;
+}
+
+static irqreturn_t brcmnand_ctlrdy_irq(int irq, void *data)
+{
+	struct brcmnand_controller *ctrl = data;
+
+	/* Discard all NAND_CTLRDY interrupts during DMA */
+	if (ctrl->dma_pending)
+		return IRQ_HANDLED;
+
+	complete(&ctrl->done);
+	return IRQ_HANDLED;
+}
+
+/* Handle SoC-specific interrupt hardware */
+static irqreturn_t brcmnand_irq(int irq, void *data)
+{
+	struct brcmnand_controller *ctrl = data;
+
+	if (ctrl->soc->ctlrdy_ack(ctrl->soc))
+		return brcmnand_ctlrdy_irq(irq, data);
+
+	return IRQ_NONE;
+}
+
+static irqreturn_t brcmnand_dma_irq(int irq, void *data)
+{
+	struct brcmnand_controller *ctrl = data;
+
+	complete(&ctrl->dma_done);
+
+	return IRQ_HANDLED;
+}
+
+static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	u32 intfc;
+
+	dev_dbg(ctrl->dev, "send native cmd %d addr_lo 0x%x\n", cmd,
+		brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS));
+	BUG_ON(ctrl->cmd_pending != 0);
+	ctrl->cmd_pending = cmd;
+
+	intfc = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS);
+	BUG_ON(!(intfc & INTFC_CTLR_READY));
+
+	mb(); /* flush previous writes */
+	brcmnand_write_reg(ctrl, BRCMNAND_CMD_START,
+			   cmd << brcmnand_cmd_shift(ctrl));
+}
+
+/***********************************************************************
+ * NAND MTD API: read/program/erase
+ ***********************************************************************/
+
+static void brcmnand_cmd_ctrl(struct mtd_info *mtd, int dat,
+	unsigned int ctrl)
+{
+	/* intentionally left blank */
+}
+
+static int brcmnand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct brcmnand_host *host = chip->priv;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	unsigned long timeo = msecs_to_jiffies(100);
+
+	dev_dbg(ctrl->dev, "wait on native cmd %d\n", ctrl->cmd_pending);
+	if (ctrl->cmd_pending &&
+			wait_for_completion_timeout(&ctrl->done, timeo) <= 0) {
+		u32 cmd = brcmnand_read_reg(ctrl, BRCMNAND_CMD_START)
+					>> brcmnand_cmd_shift(ctrl);
+
+		dev_err_ratelimited(ctrl->dev,
+			"timeout waiting for command %#02x\n", cmd);
+		dev_err_ratelimited(ctrl->dev, "intfc status %08x\n",
+			brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS));
+	}
+	ctrl->cmd_pending = 0;
+	return brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) &
+				 INTFC_FLASH_STATUS;
+}
+
+enum {
+	LLOP_RE				= BIT(16),
+	LLOP_WE				= BIT(17),
+	LLOP_ALE			= BIT(18),
+	LLOP_CLE			= BIT(19),
+	LLOP_RETURN_IDLE		= BIT(31),
+
+	LLOP_DATA_MASK			= GENMASK(15, 0),
+};
+
+static int brcmnand_low_level_op(struct brcmnand_host *host,
+				 enum brcmnand_llop_type type, u32 data,
+				 bool last_op)
+{
+	struct mtd_info *mtd = &host->mtd;
+	struct nand_chip *chip = &host->chip;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	u32 tmp;
+
+	tmp = data & LLOP_DATA_MASK;
+	switch (type) {
+	case LL_OP_CMD:
+		tmp |= LLOP_WE | LLOP_CLE;
+		break;
+	case LL_OP_ADDR:
+		/* WE | ALE */
+		tmp |= LLOP_WE | LLOP_ALE;
+		break;
+	case LL_OP_WR:
+		/* WE */
+		tmp |= LLOP_WE;
+		break;
+	case LL_OP_RD:
+		/* RE */
+		tmp |= LLOP_RE;
+		break;
+	}
+	if (last_op)
+		/* RETURN_IDLE */
+		tmp |= LLOP_RETURN_IDLE;
+
+	dev_dbg(ctrl->dev, "ll_op cmd %#x\n", tmp);
+
+	brcmnand_write_reg(ctrl, BRCMNAND_LL_OP, tmp);
+	(void)brcmnand_read_reg(ctrl, BRCMNAND_LL_OP);
+
+	brcmnand_send_cmd(host, CMD_LOW_LEVEL_OP);
+	return brcmnand_waitfunc(mtd, chip);
+}
+
+static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
+			     int column, int page_addr)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct brcmnand_host *host = chip->priv;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	u64 addr = (u64)page_addr << chip->page_shift;
+	int native_cmd = 0;
+
+	if (command == NAND_CMD_READID || command == NAND_CMD_PARAM ||
+			command == NAND_CMD_RNDOUT)
+		addr = (u64)column;
+	/* Avoid propagating a negative, don't-care address */
+	else if (page_addr < 0)
+		addr = 0;
+
+	dev_dbg(ctrl->dev, "cmd 0x%x addr 0x%llx\n", command,
+		(unsigned long long)addr);
+
+	host->last_cmd = command;
+	host->last_byte = 0;
+	host->last_addr = addr;
+
+	switch (command) {
+	case NAND_CMD_RESET:
+		native_cmd = CMD_FLASH_RESET;
+		break;
+	case NAND_CMD_STATUS:
+		native_cmd = CMD_STATUS_READ;
+		break;
+	case NAND_CMD_READID:
+		native_cmd = CMD_DEVICE_ID_READ;
+		break;
+	case NAND_CMD_READOOB:
+		native_cmd = CMD_SPARE_AREA_READ;
+		break;
+	case NAND_CMD_ERASE1:
+		native_cmd = CMD_BLOCK_ERASE;
+		brcmnand_wp(mtd, 0);
+		break;
+	case NAND_CMD_PARAM:
+		native_cmd = CMD_PARAMETER_READ;
+		break;
+	case NAND_CMD_SET_FEATURES:
+	case NAND_CMD_GET_FEATURES:
+		brcmnand_low_level_op(host, LL_OP_CMD, command, false);
+		brcmnand_low_level_op(host, LL_OP_ADDR, column, false);
+		break;
+	case NAND_CMD_RNDOUT:
+		native_cmd = CMD_PARAMETER_CHANGE_COL;
+		addr &= ~((u64)(FC_BYTES - 1));
+		/*
+		 * HW quirk: PARAMETER_CHANGE_COL requires SECTOR_SIZE_1K=0
+		 * NB: hwcfg.sector_size_1k may not be initialized yet
+		 */
+		if (brcmnand_get_sector_size_1k(host)) {
+			host->hwcfg.sector_size_1k =
+				brcmnand_get_sector_size_1k(host);
+			brcmnand_set_sector_size_1k(host, 0);
+		}
+		break;
+	}
+
+	if (!native_cmd)
+		return;
+
+	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
+		(host->cs << 16) | ((addr >> 32) & 0xffff));
+	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
+	brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, lower_32_bits(addr));
+	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
+
+	brcmnand_send_cmd(host, native_cmd);
+	brcmnand_waitfunc(mtd, chip);
+
+	if (native_cmd == CMD_PARAMETER_READ ||
+			native_cmd == CMD_PARAMETER_CHANGE_COL) {
+		int i;
+
+		brcmnand_soc_data_bus_prepare(ctrl->soc);
+
+		/*
+		 * Must cache the FLASH_CACHE now, since changes in
+		 * SECTOR_SIZE_1K may invalidate it
+		 */
+		for (i = 0; i < FC_WORDS; i++)
+			ctrl->flash_cache[i] = brcmnand_read_fc(ctrl, i);
+
+		brcmnand_soc_data_bus_unprepare(ctrl->soc);
+
+		/* Cleanup from HW quirk: restore SECTOR_SIZE_1K */
+		if (host->hwcfg.sector_size_1k)
+			brcmnand_set_sector_size_1k(host,
+						    host->hwcfg.sector_size_1k);
+	}
+
+	/* Re-enable protection is necessary only after erase */
+	if (command == NAND_CMD_ERASE1)
+		brcmnand_wp(mtd, 1);
+}
+
+static uint8_t brcmnand_read_byte(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct brcmnand_host *host = chip->priv;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	uint8_t ret = 0;
+	int addr, offs;
+
+	switch (host->last_cmd) {
+	case NAND_CMD_READID:
+		if (host->last_byte < 4)
+			ret = brcmnand_read_reg(ctrl, BRCMNAND_ID) >>
+				(24 - (host->last_byte << 3));
+		else if (host->last_byte < 8)
+			ret = brcmnand_read_reg(ctrl, BRCMNAND_ID_EXT) >>
+				(56 - (host->last_byte << 3));
+		break;
+
+	case NAND_CMD_READOOB:
+		ret = oob_reg_read(ctrl, host->last_byte);
+		break;
+
+	case NAND_CMD_STATUS:
+		ret = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) &
+					INTFC_FLASH_STATUS;
+		if (wp_on) /* hide WP status */
+			ret |= NAND_STATUS_WP;
+		break;
+
+	case NAND_CMD_PARAM:
+	case NAND_CMD_RNDOUT:
+		addr = host->last_addr + host->last_byte;
+		offs = addr & (FC_BYTES - 1);
+
+		/* At FC_BYTES boundary, switch to next column */
+		if (host->last_byte > 0 && offs == 0)
+			chip->cmdfunc(mtd, NAND_CMD_RNDOUT, addr, -1);
+
+		ret = ctrl->flash_cache[offs >> 2] >>
+					(24 - ((offs & 0x03) << 3));
+		break;
+	case NAND_CMD_GET_FEATURES:
+		if (host->last_byte >= ONFI_SUBFEATURE_PARAM_LEN) {
+			ret = 0;
+		} else {
+			bool last = host->last_byte ==
+				ONFI_SUBFEATURE_PARAM_LEN - 1;
+			brcmnand_low_level_op(host, LL_OP_RD, 0, last);
+			ret = brcmnand_read_reg(ctrl, BRCMNAND_LL_RDATA) & 0xff;
+		}
+	}
+
+	dev_dbg(ctrl->dev, "read byte = 0x%02x\n", ret);
+	host->last_byte++;
+
+	return ret;
+}
+
+static void brcmnand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++, buf++)
+		*buf = brcmnand_read_byte(mtd);
+}
+
+static void brcmnand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
+				   int len)
+{
+	int i;
+	struct nand_chip *chip = mtd->priv;
+	struct brcmnand_host *host = chip->priv;
+
+	switch (host->last_cmd) {
+	case NAND_CMD_SET_FEATURES:
+		for (i = 0; i < len; i++)
+			brcmnand_low_level_op(host, LL_OP_WR, buf[i],
+						  (i + 1) == len);
+		break;
+	default:
+		BUG();
+		break;
+	}
+}
+
+/**
+ * Construct a FLASH_DMA descriptor as part of a linked list. You must know the
+ * following ahead of time:
+ *  - Is this descriptor the beginning or end of a linked list?
+ *  - What is the (DMA) address of the next descriptor in the linked list?
+ */
+static int brcmnand_fill_dma_desc(struct brcmnand_host *host,
+				  struct brcm_nand_dma_desc *desc, u64 addr,
+				  dma_addr_t buf, u32 len, u8 dma_cmd,
+				  bool begin, bool end,
+				  dma_addr_t next_desc)
+{
+	memset(desc, 0, sizeof(*desc));
+	/* Descriptors are written in native byte order (wordwise) */
+	desc->next_desc = lower_32_bits(next_desc);
+	desc->next_desc_ext = upper_32_bits(next_desc);
+	desc->cmd_irq = (dma_cmd << 24) |
+		(end ? (0x03 << 8) : 0) | /* IRQ | STOP */
+		(!!begin) | ((!!end) << 1); /* head, tail */
+#ifdef CONFIG_CPU_BIG_ENDIAN
+	desc->cmd_irq |= 0x01 << 12;
+#endif
+	desc->dram_addr = lower_32_bits(buf);
+	desc->dram_addr_ext = upper_32_bits(buf);
+	desc->tfr_len = len;
+	desc->total_len = len;
+	desc->flash_addr = lower_32_bits(addr);
+	desc->flash_addr_ext = upper_32_bits(addr);
+	desc->cs = host->cs;
+	desc->status_valid = 0x01;
+	return 0;
+}
+
+/**
+ * Kick the FLASH_DMA engine, with a given DMA descriptor
+ */
+static void brcmnand_dma_run(struct brcmnand_host *host, dma_addr_t desc)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	unsigned long timeo = msecs_to_jiffies(100);
+
+	flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC, lower_32_bits(desc));
+	(void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC);
+	flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC_EXT, upper_32_bits(desc));
+	(void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC_EXT);
+
+	/* Start FLASH_DMA engine */
+	ctrl->dma_pending = true;
+	mb(); /* flush previous writes */
+	flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0x03); /* wake | run */
+
+	if (wait_for_completion_timeout(&ctrl->dma_done, timeo) <= 0) {
+		dev_err(ctrl->dev,
+				"timeout waiting for DMA; status %#x, error status %#x\n",
+				flash_dma_readl(ctrl, FLASH_DMA_STATUS),
+				flash_dma_readl(ctrl, FLASH_DMA_ERROR_STATUS));
+	}
+	ctrl->dma_pending = false;
+	flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0); /* force stop */
+}
+
+static int brcmnand_dma_trans(struct brcmnand_host *host, u64 addr, u32 *buf,
+			      u32 len, u8 dma_cmd)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	dma_addr_t buf_pa;
+	int dir = dma_cmd == CMD_PAGE_READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+
+	buf_pa = dma_map_single(ctrl->dev, buf, len, dir);
+	if (dma_mapping_error(ctrl->dev, buf_pa)) {
+		dev_err(ctrl->dev, "unable to map buffer for DMA\n");
+		return -ENOMEM;
+	}
+
+	brcmnand_fill_dma_desc(host, ctrl->dma_desc, addr, buf_pa, len,
+				   dma_cmd, true, true, 0);
+
+	brcmnand_dma_run(host, ctrl->dma_pa);
+
+	dma_unmap_single(ctrl->dev, buf_pa, len, dir);
+
+	if (ctrl->dma_desc->status_valid & FLASH_DMA_ECC_ERROR)
+		return -EBADMSG;
+	else if (ctrl->dma_desc->status_valid & FLASH_DMA_CORR_ERROR)
+		return -EUCLEAN;
+
+	return 0;
+}
+
+/*
+ * Assumes proper CS is already set
+ */
+static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
+				u64 addr, unsigned int trans, u32 *buf,
+				u8 *oob, u64 *err_addr)
+{
+	struct brcmnand_host *host = chip->priv;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	int i, j, ret = 0;
+
+	/* Clear error addresses */
+	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
+	brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
+
+	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
+			(host->cs << 16) | ((addr >> 32) & 0xffff));
+	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
+
+	for (i = 0; i < trans; i++, addr += FC_BYTES) {
+		brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
+				   lower_32_bits(addr));
+		(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
+		/* SPARE_AREA_READ does not use ECC, so just use PAGE_READ */
+		brcmnand_send_cmd(host, CMD_PAGE_READ);
+		brcmnand_waitfunc(mtd, chip);
+
+		if (likely(buf)) {
+			brcmnand_soc_data_bus_prepare(ctrl->soc);
+
+			for (j = 0; j < FC_WORDS; j++, buf++)
+				*buf = brcmnand_read_fc(ctrl, j);
+
+			brcmnand_soc_data_bus_unprepare(ctrl->soc);
+		}
+
+		if (oob)
+			oob += read_oob_from_regs(ctrl, i, oob,
+					mtd->oobsize / trans,
+					host->hwcfg.sector_size_1k);
+
+		if (!ret) {
+			*err_addr = brcmnand_read_reg(ctrl,
+					BRCMNAND_UNCORR_ADDR) |
+				((u64)(brcmnand_read_reg(ctrl,
+						BRCMNAND_UNCORR_EXT_ADDR)
+					& 0xffff) << 32);
+			if (*err_addr)
+				ret = -EBADMSG;
+		}
+
+		if (!ret) {
+			*err_addr = brcmnand_read_reg(ctrl,
+					BRCMNAND_CORR_ADDR) |
+				((u64)(brcmnand_read_reg(ctrl,
+						BRCMNAND_CORR_EXT_ADDR)
+					& 0xffff) << 32);
+			if (*err_addr)
+				ret = -EUCLEAN;
+		}
+	}
+
+	return ret;
+}
+
+static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
+			 u64 addr, unsigned int trans, u32 *buf, u8 *oob)
+{
+	struct brcmnand_host *host = chip->priv;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	u64 err_addr = 0;
+	int err;
+
+	dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf);
+
+	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_COUNT, 0);
+
+	if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
+		err = brcmnand_dma_trans(host, addr, buf, trans * FC_BYTES,
+					     CMD_PAGE_READ);
+		if (err) {
+			if (mtd_is_bitflip_or_eccerr(err))
+				err_addr = addr;
+			else
+				return -EIO;
+		}
+	} else {
+		if (oob)
+			memset(oob, 0x99, mtd->oobsize);
+
+		err = brcmnand_read_by_pio(mtd, chip, addr, trans, buf,
+					       oob, &err_addr);
+	}
+
+	if (mtd_is_eccerr(err)) {
+		dev_dbg(ctrl->dev, "uncorrectable error at 0x%llx\n",
+			(unsigned long long)err_addr);
+		mtd->ecc_stats.failed++;
+		/* NAND layer expects zero on ECC errors */
+		return 0;
+	}
+
+	if (mtd_is_bitflip(err)) {
+		unsigned int corrected = brcmnand_count_corrected(ctrl);
+
+		dev_dbg(ctrl->dev, "corrected error at 0x%llx\n",
+			(unsigned long long)err_addr);
+		mtd->ecc_stats.corrected += corrected;
+		/* Always exceed the software-imposed threshold */
+		return max(mtd->bitflip_threshold, corrected);
+	}
+
+	return 0;
+}
+
+static int brcmnand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
+			      uint8_t *buf, int oob_required, int page)
+{
+	struct brcmnand_host *host = chip->priv;
+	u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL;
+
+	return brcmnand_read(mtd, chip, host->last_addr,
+			mtd->writesize >> FC_SHIFT, (u32 *)buf, oob);
+}
+
+static int brcmnand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+				  uint8_t *buf, int oob_required, int page)
+{
+	struct brcmnand_host *host = chip->priv;
+	u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL;
+	int ret;
+
+	brcmnand_set_ecc_enabled(host, 0);
+	ret = brcmnand_read(mtd, chip, host->last_addr,
+			mtd->writesize >> FC_SHIFT, (u32 *)buf, oob);
+	brcmnand_set_ecc_enabled(host, 1);
+	return ret;
+}
+
+static int brcmnand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
+			     int page)
+{
+	return brcmnand_read(mtd, chip, (u64)page << chip->page_shift,
+			mtd->writesize >> FC_SHIFT,
+			NULL, (u8 *)chip->oob_poi);
+}
+
+static int brcmnand_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+				 int page)
+{
+	struct brcmnand_host *host = chip->priv;
+
+	brcmnand_set_ecc_enabled(host, 0);
+	brcmnand_read(mtd, chip, (u64)page << chip->page_shift,
+		mtd->writesize >> FC_SHIFT,
+		NULL, (u8 *)chip->oob_poi);
+	brcmnand_set_ecc_enabled(host, 1);
+	return 0;
+}
+
+static int brcmnand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
+				 uint32_t data_offs, uint32_t readlen,
+				 uint8_t *bufpoi, int page)
+{
+	struct brcmnand_host *host = chip->priv;
+
+	return brcmnand_read(mtd, chip, host->last_addr + data_offs,
+			readlen >> FC_SHIFT, (u32 *)bufpoi, NULL);
+}
+
+static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip,
+			  u64 addr, const u32 *buf, u8 *oob)
+{
+	struct brcmnand_host *host = chip->priv;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	unsigned int i, j, trans = mtd->writesize >> FC_SHIFT;
+	int status, ret = 0;
+
+	dev_dbg(ctrl->dev, "write %llx <- %p\n", (unsigned long long)addr, buf);
+
+	if (unlikely((u32)buf & 0x03)) {
+		dev_warn(ctrl->dev, "unaligned buffer: %p\n", buf);
+		buf = (u32 *)((u32)buf & ~0x03);
+	}
+
+	brcmnand_wp(mtd, 0);
+
+	for (i = 0; i < ctrl->max_oob; i += 4)
+		oob_reg_write(ctrl, i, 0xffffffff);
+
+	if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
+		if (brcmnand_dma_trans(host, addr, (u32 *)buf,
+					mtd->writesize, CMD_PROGRAM_PAGE))
+			ret = -EIO;
+		goto out;
+	}
+
+	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
+			(host->cs << 16) | ((addr >> 32) & 0xffff));
+	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
+
+	for (i = 0; i < trans; i++, addr += FC_BYTES) {
+		/* full address MUST be set before populating FC */
+		brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
+				   lower_32_bits(addr));
+		(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
+
+		if (buf) {
+			brcmnand_soc_data_bus_prepare(ctrl->soc);
+
+			for (j = 0; j < FC_WORDS; j++, buf++)
+				brcmnand_write_fc(ctrl, j, *buf);
+
+			brcmnand_soc_data_bus_unprepare(ctrl->soc);
+		} else if (oob) {
+			for (j = 0; j < FC_WORDS; j++)
+				brcmnand_write_fc(ctrl, j, 0xffffffff);
+		}
+
+		if (oob) {
+			oob += write_oob_to_regs(ctrl, i, oob,
+					mtd->oobsize / trans,
+					host->hwcfg.sector_size_1k);
+		}
+
+		/* we cannot use SPARE_AREA_PROGRAM when PARTIAL_PAGE_EN=0 */
+		brcmnand_send_cmd(host, CMD_PROGRAM_PAGE);
+		status = brcmnand_waitfunc(mtd, chip);
+
+		if (status & NAND_STATUS_FAIL) {
+			dev_info(ctrl->dev, "program failed at %llx\n",
+				(unsigned long long)addr);
+			ret = -EIO;
+			goto out;
+		}
+	}
+out:
+	brcmnand_wp(mtd, 1);
+	return ret;
+}
+
+static int brcmnand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
+			       const uint8_t *buf, int oob_required)
+{
+	struct brcmnand_host *host = chip->priv;
+	void *oob = oob_required ? chip->oob_poi : NULL;
+
+	brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob);
+	return 0;
+}
+
+static int brcmnand_write_page_raw(struct mtd_info *mtd,
+				   struct nand_chip *chip, const uint8_t *buf,
+				   int oob_required)
+{
+	struct brcmnand_host *host = chip->priv;
+	void *oob = oob_required ? chip->oob_poi : NULL;
+
+	brcmnand_set_ecc_enabled(host, 0);
+	brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob);
+	brcmnand_set_ecc_enabled(host, 1);
+	return 0;
+}
+
+static int brcmnand_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
+				  int page)
+{
+	return brcmnand_write(mtd, chip, (u64)page << chip->page_shift,
+				  NULL, chip->oob_poi);
+}
+
+static int brcmnand_write_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+				  int page)
+{
+	struct brcmnand_host *host = chip->priv;
+	int ret;
+
+	brcmnand_set_ecc_enabled(host, 0);
+	ret = brcmnand_write(mtd, chip, (u64)page << chip->page_shift, NULL,
+				 (u8 *)chip->oob_poi);
+	brcmnand_set_ecc_enabled(host, 1);
+
+	return ret;
+}
+
+/***********************************************************************
+ * Per-CS setup (1 NAND device)
+ ***********************************************************************/
+
+static int brcmnand_set_cfg(struct brcmnand_host *host,
+			    struct brcmnand_cfg *cfg)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	struct nand_chip *chip = &host->chip;
+	u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
+	u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs,
+			BRCMNAND_CS_CFG_EXT);
+	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
+			BRCMNAND_CS_ACC_CONTROL);
+	u8 block_size = 0, page_size = 0, device_size = 0;
+	u32 tmp;
+
+	if (ctrl->block_sizes) {
+		int i, found;
+
+		for (i = 0, found = 0; ctrl->block_sizes[i]; i++)
+			if (ctrl->block_sizes[i] * 1024 == cfg->block_size) {
+				block_size = i;
+				found = 1;
+			}
+		if (!found) {
+			dev_warn(ctrl->dev, "invalid block size %u\n",
+					cfg->block_size);
+			return -EINVAL;
+		}
+	} else {
+		block_size = ffs(cfg->block_size) - ffs(BRCMNAND_MIN_BLOCKSIZE);
+	}
+
+	if (cfg->block_size < BRCMNAND_MIN_BLOCKSIZE || (ctrl->max_block_size &&
+				cfg->block_size > ctrl->max_block_size)) {
+		dev_warn(ctrl->dev, "invalid block size %u\n",
+				cfg->block_size);
+		block_size = 0;
+	}
+
+	if (ctrl->page_sizes) {
+		int i, found;
+
+		for (i = 0, found = 0; ctrl->page_sizes[i]; i++)
+			if (ctrl->page_sizes[i] == cfg->page_size) {
+				page_size = i;
+				found = 1;
+			}
+		if (!found) {
+			dev_warn(ctrl->dev, "invalid page size %u\n",
+					cfg->page_size);
+			return -EINVAL;
+		}
+	} else {
+		page_size = ffs(cfg->page_size) - ffs(BRCMNAND_MIN_PAGESIZE);
+	}
+
+	if (cfg->page_size < BRCMNAND_MIN_PAGESIZE || (ctrl->max_page_size &&
+				cfg->page_size > ctrl->max_page_size)) {
+		dev_warn(ctrl->dev, "invalid page size %u\n", cfg->page_size);
+		return -EINVAL;
+	}
+
+	if (fls64(cfg->device_size) < fls64(BRCMNAND_MIN_DEVSIZE)) {
+		dev_warn(ctrl->dev, "invalid device size 0x%llx\n",
+			(unsigned long long)cfg->device_size);
+		return -EINVAL;
+	}
+	device_size = fls64(cfg->device_size) - fls64(BRCMNAND_MIN_DEVSIZE);
+
+	tmp = (cfg->blk_adr_bytes << 8) |
+		(cfg->col_adr_bytes << 12) |
+		(cfg->ful_adr_bytes << 16) |
+		(!!(cfg->device_width == 16) << 23) |
+		(device_size << 24);
+	if (cfg_offs == cfg_ext_offs) {
+		tmp |= (page_size << 20) | (block_size << 28);
+		nand_writereg(ctrl, cfg_offs, tmp);
+	} else {
+		nand_writereg(ctrl, cfg_offs, tmp);
+		tmp = page_size | (block_size << 4);
+		nand_writereg(ctrl, cfg_ext_offs, tmp);
+	}
+
+	tmp = nand_readreg(ctrl, acc_control_offs);
+	tmp &= ~brcmnand_ecc_level_mask(ctrl);
+	tmp |= cfg->ecc_level << NAND_ACC_CONTROL_ECC_SHIFT;
+	tmp &= ~brcmnand_spare_area_mask(ctrl);
+	tmp |= cfg->spare_area_size;
+	nand_writereg(ctrl, acc_control_offs, tmp);
+
+	brcmnand_set_sector_size_1k(host, cfg->sector_size_1k);
+
+	/* threshold = ceil(BCH-level * 0.75) */
+	brcmnand_wr_corr_thresh(host, DIV_ROUND_UP(chip->ecc.strength * 3, 4));
+
+	return 0;
+}
+
+static void brcmnand_print_cfg(char *buf, struct brcmnand_cfg *cfg)
+{
+	buf += sprintf(buf,
+		"%lluMiB total, %uKiB blocks, %u%s pages, %uB OOB, %u-bit",
+		(unsigned long long)cfg->device_size >> 20,
+		cfg->block_size >> 10,
+		cfg->page_size >= 1024 ? cfg->page_size >> 10 : cfg->page_size,
+		cfg->page_size >= 1024 ? "KiB" : "B",
+		cfg->spare_area_size, cfg->device_width);
+
+	/* Account for Hamming ECC and for BCH 512B vs 1KiB sectors */
+	if (is_hamming_ecc(cfg))
+		sprintf(buf, ", Hamming ECC");
+	else if (cfg->sector_size_1k)
+		sprintf(buf, ", BCH-%u (1KiB sector)", cfg->ecc_level << 1);
+	else
+		sprintf(buf, ", BCH-%u", cfg->ecc_level);
+}
+
+/*
+ * Minimum number of bytes to address a page. Calculated as:
+ *     roundup(log2(size / page-size) / 8)
+ *
+ * NB: the following does not "round up" for non-power-of-2 'size'; but this is
+ *     OK because many other things will break if 'size' is irregular...
+ */
+static inline int get_blk_adr_bytes(u64 size, u32 writesize)
+{
+	return ALIGN(ilog2(size) - ilog2(writesize), 8) >> 3;
+}
+
+static int brcmnand_setup_dev(struct brcmnand_host *host)
+{
+	struct mtd_info *mtd = &host->mtd;
+	struct nand_chip *chip = &host->chip;
+	struct brcmnand_controller *ctrl = host->ctrl;
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	char msg[128];
+	u32 offs, tmp, oob_sector;
+	int ret;
+
+	memset(cfg, 0, sizeof(*cfg));
+
+	ret = of_property_read_u32(chip->dn, "brcm,nand-oob-sector-size",
+				   &oob_sector);
+	if (ret) {
+		/* Use detected size */
+		cfg->spare_area_size = mtd->oobsize /
+					(mtd->writesize >> FC_SHIFT);
+	} else {
+		cfg->spare_area_size = oob_sector;
+	}
+	if (cfg->spare_area_size > ctrl->max_oob)
+		cfg->spare_area_size = ctrl->max_oob;
+	/*
+	 * Set oobsize to be consistent with controller's spare_area_size, as
+	 * the rest is inaccessible.
+	 */
+	mtd->oobsize = cfg->spare_area_size * (mtd->writesize >> FC_SHIFT);
+
+	cfg->device_size = mtd->size;
+	cfg->block_size = mtd->erasesize;
+	cfg->page_size = mtd->writesize;
+	cfg->device_width = (chip->options & NAND_BUSWIDTH_16) ? 16 : 8;
+	cfg->col_adr_bytes = 2;
+	cfg->blk_adr_bytes = get_blk_adr_bytes(mtd->size, mtd->writesize);
+
+	switch (chip->ecc.size) {
+	case 512:
+		if (chip->ecc.strength == 1) /* Hamming */
+			cfg->ecc_level = 15;
+		else
+			cfg->ecc_level = chip->ecc.strength;
+		cfg->sector_size_1k = 0;
+		break;
+	case 1024:
+		if (!(ctrl->features & BRCMNAND_HAS_1K_SECTORS)) {
+			dev_err(ctrl->dev, "1KB sectors not supported\n");
+			return -EINVAL;
+		}
+		if (chip->ecc.strength & 0x1) {
+			dev_err(ctrl->dev,
+				"odd ECC not supported with 1KB sectors\n");
+			return -EINVAL;
+		}
+
+		cfg->ecc_level = chip->ecc.strength >> 1;
+		cfg->sector_size_1k = 1;
+		break;
+	default:
+		dev_err(ctrl->dev, "unsupported ECC size: %d\n",
+			chip->ecc.size);
+		return -EINVAL;
+	}
+
+	cfg->ful_adr_bytes = cfg->blk_adr_bytes;
+	if (mtd->writesize > 512)
+		cfg->ful_adr_bytes += cfg->col_adr_bytes;
+	else
+		cfg->ful_adr_bytes += 1;
+
+	ret = brcmnand_set_cfg(host, cfg);
+	if (ret)
+		return ret;
+
+	brcmnand_set_ecc_enabled(host, 1);
+
+	brcmnand_print_cfg(msg, cfg);
+	dev_info(ctrl->dev, "detected %s\n", msg);
+
+	/* Configure ACC_CONTROL */
+	offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL);
+	tmp = nand_readreg(ctrl, offs);
+	tmp &= ~ACC_CONTROL_PARTIAL_PAGE;
+	tmp &= ~ACC_CONTROL_RD_ERASED;
+	tmp &= ~ACC_CONTROL_FAST_PGM_RDIN;
+	if (ctrl->features & BRCMNAND_HAS_PREFETCH) {
+		/*
+		 * FIXME: Flash DMA + prefetch may see spurious erased-page ECC
+		 * errors
+		 */
+		if (has_flash_dma(ctrl))
+			tmp &= ~ACC_CONTROL_PREFETCH;
+		else
+			tmp |= ACC_CONTROL_PREFETCH;
+	}
+	nand_writereg(ctrl, offs, tmp);
+
+	return 0;
+}
+
+static int brcmnand_init_cs(struct brcmnand_host *host)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	struct device_node *dn = host->of_node;
+	struct platform_device *pdev = host->pdev;
+	struct mtd_info *mtd;
+	struct nand_chip *chip;
+	int ret;
+	struct mtd_part_parser_data ppdata = { .of_node = dn };
+
+	ret = of_property_read_u32(dn, "reg", &host->cs);
+	if (ret) {
+		dev_err(&pdev->dev, "can't get chip-select\n");
+		return -ENXIO;
+	}
+
+	mtd = &host->mtd;
+	chip = &host->chip;
+
+	chip->dn = dn;
+	chip->priv = host;
+	mtd->priv = chip;
+	mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "brcmnand.%d",
+				   host->cs);
+	mtd->owner = THIS_MODULE;
+	mtd->dev.parent = &pdev->dev;
+
+	chip->IO_ADDR_R = (void __iomem *)0xdeadbeef;
+	chip->IO_ADDR_W = (void __iomem *)0xdeadbeef;
+
+	chip->cmd_ctrl = brcmnand_cmd_ctrl;
+	chip->cmdfunc = brcmnand_cmdfunc;
+	chip->waitfunc = brcmnand_waitfunc;
+	chip->read_byte = brcmnand_read_byte;
+	chip->read_buf = brcmnand_read_buf;
+	chip->write_buf = brcmnand_write_buf;
+
+	chip->ecc.mode = NAND_ECC_HW;
+	chip->ecc.read_page = brcmnand_read_page;
+	chip->ecc.read_subpage = brcmnand_read_subpage;
+	chip->ecc.write_page = brcmnand_write_page;
+	chip->ecc.read_page_raw = brcmnand_read_page_raw;
+	chip->ecc.write_page_raw = brcmnand_write_page_raw;
+	chip->ecc.write_oob_raw = brcmnand_write_oob_raw;
+	chip->ecc.read_oob_raw = brcmnand_read_oob_raw;
+	chip->ecc.read_oob = brcmnand_read_oob;
+	chip->ecc.write_oob = brcmnand_write_oob;
+
+	chip->controller = &ctrl->controller;
+
+	if (nand_scan_ident(mtd, 1, NULL))
+		return -ENXIO;
+
+	chip->options |= NAND_NO_SUBPAGE_WRITE;
+	/*
+	 * Avoid (for instance) kmap()'d buffers from JFFS2, which we can't DMA
+	 * to/from, and have nand_base pass us a bounce buffer instead, as
+	 * needed.
+	 */
+	chip->options |= NAND_USE_BOUNCE_BUFFER;
+
+	if (of_get_nand_on_flash_bbt(dn))
+		chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
+
+	if (brcmnand_setup_dev(host))
+		return -ENXIO;
+
+	chip->ecc.size = host->hwcfg.sector_size_1k ? 1024 : 512;
+	/* only use our internal HW threshold */
+	mtd->bitflip_threshold = 1;
+
+	chip->ecc.layout = brcmstb_choose_ecc_layout(host);
+	if (!chip->ecc.layout)
+		return -ENXIO;
+
+	if (nand_scan_tail(mtd))
+		return -ENXIO;
+
+	return mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
+}
+
+static void brcmnand_save_restore_cs_config(struct brcmnand_host *host,
+					    int restore)
+{
+	struct brcmnand_controller *ctrl = host->ctrl;
+	u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
+	u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs,
+			BRCMNAND_CS_CFG_EXT);
+	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
+			BRCMNAND_CS_ACC_CONTROL);
+	u16 t1_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING1);
+	u16 t2_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING2);
+
+	if (restore) {
+		nand_writereg(ctrl, cfg_offs, host->hwcfg.config);
+		if (cfg_offs != cfg_ext_offs)
+			nand_writereg(ctrl, cfg_ext_offs,
+				      host->hwcfg.config_ext);
+		nand_writereg(ctrl, acc_control_offs, host->hwcfg.acc_control);
+		nand_writereg(ctrl, t1_offs, host->hwcfg.timing_1);
+		nand_writereg(ctrl, t2_offs, host->hwcfg.timing_2);
+	} else {
+		host->hwcfg.config = nand_readreg(ctrl, cfg_offs);
+		if (cfg_offs != cfg_ext_offs)
+			host->hwcfg.config_ext =
+				nand_readreg(ctrl, cfg_ext_offs);
+		host->hwcfg.acc_control = nand_readreg(ctrl, acc_control_offs);
+		host->hwcfg.timing_1 = nand_readreg(ctrl, t1_offs);
+		host->hwcfg.timing_2 = nand_readreg(ctrl, t2_offs);
+	}
+}
+
+static int brcmnand_suspend(struct device *dev)
+{
+	struct brcmnand_controller *ctrl = dev_get_drvdata(dev);
+	struct brcmnand_host *host;
+
+	list_for_each_entry(host, &ctrl->host_list, node)
+		brcmnand_save_restore_cs_config(host, 0);
+
+	ctrl->nand_cs_nand_select = brcmnand_read_reg(ctrl, BRCMNAND_CS_SELECT);
+	ctrl->nand_cs_nand_xor = brcmnand_read_reg(ctrl, BRCMNAND_CS_XOR);
+	ctrl->corr_stat_threshold =
+		brcmnand_read_reg(ctrl, BRCMNAND_CORR_THRESHOLD);
+
+	if (has_flash_dma(ctrl))
+		ctrl->flash_dma_mode = flash_dma_readl(ctrl, FLASH_DMA_MODE);
+
+	return 0;
+}
+
+static int brcmnand_resume(struct device *dev)
+{
+	struct brcmnand_controller *ctrl = dev_get_drvdata(dev);
+	struct brcmnand_host *host;
+
+	if (has_flash_dma(ctrl)) {
+		flash_dma_writel(ctrl, FLASH_DMA_MODE, ctrl->flash_dma_mode);
+		flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0);
+	}
+
+	brcmnand_write_reg(ctrl, BRCMNAND_CS_SELECT, ctrl->nand_cs_nand_select);
+	brcmnand_write_reg(ctrl, BRCMNAND_CS_XOR, ctrl->nand_cs_nand_xor);
+	brcmnand_write_reg(ctrl, BRCMNAND_CORR_THRESHOLD,
+			ctrl->corr_stat_threshold);
+	if (ctrl->soc) {
+		/* Clear/re-enable interrupt */
+		ctrl->soc->ctlrdy_ack(ctrl->soc);
+		ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
+	}
+
+	list_for_each_entry(host, &ctrl->host_list, node) {
+		struct mtd_info *mtd = &host->mtd;
+		struct nand_chip *chip = mtd->priv;
+
+		brcmnand_save_restore_cs_config(host, 1);
+
+		/* Reset the chip, required by some chips after power-up */
+		chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+	}
+
+	return 0;
+}
+
+const struct dev_pm_ops brcmnand_pm_ops = {
+	.suspend		= brcmnand_suspend,
+	.resume			= brcmnand_resume,
+};
+EXPORT_SYMBOL_GPL(brcmnand_pm_ops);
+
+static const struct of_device_id brcmnand_of_match[] = {
+	{ .compatible = "brcm,brcmnand-v4.0" },
+	{ .compatible = "brcm,brcmnand-v5.0" },
+	{ .compatible = "brcm,brcmnand-v6.0" },
+	{ .compatible = "brcm,brcmnand-v6.1" },
+	{ .compatible = "brcm,brcmnand-v7.0" },
+	{ .compatible = "brcm,brcmnand-v7.1" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, brcmnand_of_match);
+
+/***********************************************************************
+ * Platform driver setup (per controller)
+ ***********************************************************************/
+
+int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *dn = dev->of_node, *child;
+	struct brcmnand_controller *ctrl;
+	struct resource *res;
+	int ret;
+
+	/* We only support device-tree instantiation */
+	if (!dn)
+		return -ENODEV;
+
+	if (!of_match_node(brcmnand_of_match, dn))
+		return -ENODEV;
+
+	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
+	if (!ctrl)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, ctrl);
+	ctrl->dev = dev;
+
+	init_completion(&ctrl->done);
+	init_completion(&ctrl->dma_done);
+	spin_lock_init(&ctrl->controller.lock);
+	init_waitqueue_head(&ctrl->controller.wq);
+	INIT_LIST_HEAD(&ctrl->host_list);
+
+	/* NAND register range */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	ctrl->nand_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(ctrl->nand_base))
+		return PTR_ERR(ctrl->nand_base);
+
+	/* Initialize NAND revision */
+	ret = brcmnand_revision_init(ctrl);
+	if (ret)
+		return ret;
+
+	/*
+	 * Most chips have this cache at a fixed offset within 'nand' block.
+	 * Some must specify this region separately.
+	 */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-cache");
+	if (res) {
+		ctrl->nand_fc = devm_ioremap_resource(dev, res);
+		if (IS_ERR(ctrl->nand_fc))
+			return PTR_ERR(ctrl->nand_fc);
+	} else {
+		ctrl->nand_fc = ctrl->nand_base +
+				ctrl->reg_offsets[BRCMNAND_FC_BASE];
+	}
+
+	/* FLASH_DMA */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "flash-dma");
+	if (res) {
+		ctrl->flash_dma_base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(ctrl->flash_dma_base))
+			return PTR_ERR(ctrl->flash_dma_base);
+
+		flash_dma_writel(ctrl, FLASH_DMA_MODE, 1); /* linked-list */
+		flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0);
+
+		/* Allocate descriptor(s) */
+		ctrl->dma_desc = dmam_alloc_coherent(dev,
+						     sizeof(*ctrl->dma_desc),
+						     &ctrl->dma_pa, GFP_KERNEL);
+		if (!ctrl->dma_desc)
+			return -ENOMEM;
+
+		ctrl->dma_irq = platform_get_irq(pdev, 1);
+		if ((int)ctrl->dma_irq < 0) {
+			dev_err(dev, "missing FLASH_DMA IRQ\n");
+			return -ENODEV;
+		}
+
+		ret = devm_request_irq(dev, ctrl->dma_irq,
+				brcmnand_dma_irq, 0, DRV_NAME,
+				ctrl);
+		if (ret < 0) {
+			dev_err(dev, "can't allocate IRQ %d: error %d\n",
+					ctrl->dma_irq, ret);
+			return ret;
+		}
+
+		dev_info(dev, "enabling FLASH_DMA\n");
+	}
+
+	/* Disable automatic device ID config, direct addressing */
+	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT,
+			 CS_SELECT_AUTO_DEVICE_ID_CFG | 0xff, 0, 0);
+	/* Disable XOR addressing */
+	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);
+
+	if (ctrl->features & BRCMNAND_HAS_WP) {
+		/* Permanently disable write protection */
+		if (wp_on == 2)
+			brcmnand_set_wp(ctrl, false);
+	} else {
+		wp_on = 0;
+	}
+
+	/* IRQ */
+	ctrl->irq = platform_get_irq(pdev, 0);
+	if ((int)ctrl->irq < 0) {
+		dev_err(dev, "no IRQ defined\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Some SoCs integrate this controller (e.g., its interrupt bits) in
+	 * interesting ways
+	 */
+	if (soc) {
+		ctrl->soc = soc;
+
+		ret = devm_request_irq(dev, ctrl->irq, brcmnand_irq, 0,
+				       DRV_NAME, ctrl);
+
+		/* Enable interrupt */
+		ctrl->soc->ctlrdy_ack(ctrl->soc);
+		ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
+	} else {
+		/* Use standard interrupt infrastructure */
+		ret = devm_request_irq(dev, ctrl->irq, brcmnand_ctlrdy_irq, 0,
+				       DRV_NAME, ctrl);
+	}
+	if (ret < 0) {
+		dev_err(dev, "can't allocate IRQ %d: error %d\n",
+			ctrl->irq, ret);
+		return ret;
+	}
+
+	for_each_available_child_of_node(dn, child) {
+		if (of_device_is_compatible(child, "brcm,nandcs")) {
+			struct brcmnand_host *host;
+
+			host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+			if (!host)
+				return -ENOMEM;
+			host->pdev = pdev;
+			host->ctrl = ctrl;
+			host->of_node = child;
+
+			ret = brcmnand_init_cs(host);
+			if (ret)
+				continue; /* Try all chip-selects */
+
+			list_add_tail(&host->node, &ctrl->host_list);
+		}
+	}
+
+	/* No chip-selects could initialize properly */
+	if (list_empty(&ctrl->host_list))
+		return -ENODEV;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(brcmnand_probe);
+
+int brcmnand_remove(struct platform_device *pdev)
+{
+	struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev);
+	struct brcmnand_host *host;
+
+	list_for_each_entry(host, &ctrl->host_list, node)
+		nand_release(&host->mtd);
+
+	dev_set_drvdata(&pdev->dev, NULL);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(brcmnand_remove);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Kevin Cernekee");
+MODULE_AUTHOR("Brian Norris");
+MODULE_DESCRIPTION("NAND driver for Broadcom chips");
+MODULE_ALIAS("platform:brcmnand");
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.h b/drivers/mtd/nand/brcmnand/brcmnand.h
new file mode 100644
index 000000000..a20c73630
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/brcmnand.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright © 2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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 __BRCMNAND_H__
+#define __BRCMNAND_H__
+
+#include <linux/types.h>
+#include <linux/io.h>
+
+struct platform_device;
+struct dev_pm_ops;
+
+struct brcmnand_soc {
+	struct platform_device *pdev;
+	void *priv;
+	bool (*ctlrdy_ack)(struct brcmnand_soc *soc);
+	void (*ctlrdy_set_enabled)(struct brcmnand_soc *soc, bool en);
+	void (*prepare_data_bus)(struct brcmnand_soc *soc, bool prepare);
+};
+
+static inline void brcmnand_soc_data_bus_prepare(struct brcmnand_soc *soc)
+{
+	if (soc && soc->prepare_data_bus)
+		soc->prepare_data_bus(soc, true);
+}
+
+static inline void brcmnand_soc_data_bus_unprepare(struct brcmnand_soc *soc)
+{
+	if (soc && soc->prepare_data_bus)
+		soc->prepare_data_bus(soc, false);
+}
+
+static inline u32 brcmnand_readl(void __iomem *addr)
+{
+	/*
+	 * MIPS endianness is configured by boot strap, which also reverses all
+	 * bus endianness (i.e., big-endian CPU + big endian bus ==> native
+	 * endian I/O).
+	 *
+	 * Other architectures (e.g., ARM) either do not support big endian, or
+	 * else leave I/O in little endian mode.
+	 */
+	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(__BIG_ENDIAN))
+		return __raw_readl(addr);
+	else
+		return readl_relaxed(addr);
+}
+
+static inline void brcmnand_writel(u32 val, void __iomem *addr)
+{
+	/* See brcmnand_readl() comments */
+	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(__BIG_ENDIAN))
+		__raw_writel(val, addr);
+	else
+		writel_relaxed(val, addr);
+}
+
+int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc);
+int brcmnand_remove(struct platform_device *pdev);
+
+extern const struct dev_pm_ops brcmnand_pm_ops;
+
+#endif /* __BRCMNAND_H__ */
diff --git a/drivers/mtd/nand/brcmnand/brcmstb_nand.c b/drivers/mtd/nand/brcmnand/brcmstb_nand.c
new file mode 100644
index 000000000..5c271077a
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/brcmstb_nand.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "brcmnand.h"
+
+static const struct of_device_id brcmstb_nand_of_match[] = {
+	{ .compatible = "brcm,brcmnand" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, brcmstb_nand_of_match);
+
+static int brcmstb_nand_probe(struct platform_device *pdev)
+{
+	return brcmnand_probe(pdev, NULL);
+}
+
+static struct platform_driver brcmstb_nand_driver = {
+	.probe			= brcmstb_nand_probe,
+	.remove			= brcmnand_remove,
+	.driver = {
+		.name		= "brcmstb_nand",
+		.pm		= &brcmnand_pm_ops,
+		.of_match_table = brcmstb_nand_of_match,
+	}
+};
+module_platform_driver(brcmstb_nand_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Brian Norris");
+MODULE_DESCRIPTION("NAND driver for Broadcom STB chips");
diff --git a/drivers/mtd/nand/brcmnand/iproc_nand.c b/drivers/mtd/nand/brcmnand/iproc_nand.c
new file mode 100644
index 000000000..683495c74
--- /dev/null
+++ b/drivers/mtd/nand/brcmnand/iproc_nand.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright © 2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/device.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "brcmnand.h"
+
+struct iproc_nand_soc_priv {
+	void __iomem *idm_base;
+	void __iomem *ext_base;
+	spinlock_t idm_lock;
+};
+
+#define IPROC_NAND_CTLR_READY_OFFSET       0x10
+#define IPROC_NAND_CTLR_READY              BIT(0)
+
+#define IPROC_NAND_IO_CTRL_OFFSET          0x00
+#define IPROC_NAND_APB_LE_MODE             BIT(24)
+#define IPROC_NAND_INT_CTRL_READ_ENABLE    BIT(6)
+
+static bool iproc_nand_intc_ack(struct brcmnand_soc *soc)
+{
+	struct iproc_nand_soc_priv *priv = soc->priv;
+	void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET;
+	u32 val = brcmnand_readl(mmio);
+
+	if (val & IPROC_NAND_CTLR_READY) {
+		brcmnand_writel(IPROC_NAND_CTLR_READY, mmio);
+		return true;
+	}
+
+	return false;
+}
+
+static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
+{
+	struct iproc_nand_soc_priv *priv = soc->priv;
+	void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
+	u32 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->idm_lock, flags);
+
+	val = brcmnand_readl(mmio);
+
+	if (en)
+		val |= IPROC_NAND_INT_CTRL_READ_ENABLE;
+	else
+		val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE;
+
+	brcmnand_writel(val, mmio);
+
+	spin_unlock_irqrestore(&priv->idm_lock, flags);
+}
+
+static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare)
+{
+	struct iproc_nand_soc_priv *priv = soc->priv;
+	void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
+	u32 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->idm_lock, flags);
+
+	val = brcmnand_readl(mmio);
+
+	if (prepare)
+		val |= IPROC_NAND_APB_LE_MODE;
+	else
+		val &= ~IPROC_NAND_APB_LE_MODE;
+
+	brcmnand_writel(val, mmio);
+
+	spin_unlock_irqrestore(&priv->idm_lock, flags);
+}
+
+static int iproc_nand_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct iproc_nand_soc_priv *priv;
+	struct brcmnand_soc *soc;
+	struct resource *res;
+
+	soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL);
+	if (!soc)
+		return -ENOMEM;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	spin_lock_init(&priv->idm_lock);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm");
+	priv->idm_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->idm_base))
+		return PTR_ERR(priv->idm_base);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext");
+	priv->ext_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->ext_base))
+		return PTR_ERR(priv->ext_base);
+
+	soc->pdev = pdev;
+	soc->priv = priv;
+	soc->ctlrdy_ack = iproc_nand_intc_ack;
+	soc->ctlrdy_set_enabled = iproc_nand_intc_set;
+	soc->prepare_data_bus = iproc_nand_apb_access;
+
+	return brcmnand_probe(pdev, soc);
+}
+
+static const struct of_device_id iproc_nand_of_match[] = {
+	{ .compatible = "brcm,nand-iproc" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_nand_of_match);
+
+static struct platform_driver iproc_nand_driver = {
+	.probe			= iproc_nand_probe,
+	.remove			= brcmnand_remove,
+	.driver = {
+		.name		= "iproc_nand",
+		.pm		= &brcmnand_pm_ops,
+		.of_match_table	= iproc_nand_of_match,
+	}
+};
+module_platform_driver(iproc_nand_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Brian Norris");
+MODULE_AUTHOR("Ray Jui");
+MODULE_DESCRIPTION("NAND driver for Broadcom IPROC-based SoCs");
diff --git a/drivers/mtd/nand/cs553x_nand.c b/drivers/mtd/nand/cs553x_nand.c
index 88109d375..aec604505 100644
--- a/drivers/mtd/nand/cs553x_nand.c
+++ b/drivers/mtd/nand/cs553x_nand.c
@@ -237,17 +237,23 @@ static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
 	/* Enable the following for a flash based bad block table */
 	this->bbt_options = NAND_BBT_USE_FLASH;
 
+	new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs);
+	if (!new_mtd->name) {
+		err = -ENOMEM;
+		goto out_ior;
+	}
+
 	/* Scan to find existence of the device */
 	if (nand_scan(new_mtd, 1)) {
 		err = -ENXIO;
-		goto out_ior;
+		goto out_free;
 	}
 
-	new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs);
-
 	cs553x_mtd[cs] = new_mtd;
 	goto out;
 
+out_free:
+	kfree(new_mtd->name);
 out_ior:
 	iounmap(this->IO_ADDR_R);
 out_mtd:
diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index f68a7bcce..7da266a53 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -69,6 +69,9 @@ struct doc_priv {
 	int mh0_page;
 	int mh1_page;
 	struct mtd_info *nextdoc;
+
+	/* Handle the last stage of initialization (BBT scan, partitioning) */
+	int (*late_init)(struct mtd_info *mtd);
 };
 
 /* This is the syndrome computed by the HW ecc generator upon reading an empty
@@ -1294,14 +1297,11 @@ static int __init nftl_scan_bbt(struct mtd_info *mtd)
 		this->bbt_md = NULL;
 	}
 
-	/* It's safe to set bd=NULL below because NAND_BBT_CREATE is not set.
-	   At least as nand_bbt.c is currently written. */
-	if ((ret = nand_scan_bbt(mtd, NULL)))
+	ret = this->scan_bbt(mtd);
+	if (ret)
 		return ret;
-	mtd_device_register(mtd, NULL, 0);
-	if (!no_autopart)
-		mtd_device_register(mtd, parts, numparts);
-	return 0;
+
+	return mtd_device_register(mtd, parts, no_autopart ? 0 : numparts);
 }
 
 static int __init inftl_scan_bbt(struct mtd_info *mtd)
@@ -1344,10 +1344,10 @@ static int __init inftl_scan_bbt(struct mtd_info *mtd)
 		this->bbt_md->pattern = "TBB_SYSM";
 	}
 
-	/* It's safe to set bd=NULL below because NAND_BBT_CREATE is not set.
-	   At least as nand_bbt.c is currently written. */
-	if ((ret = nand_scan_bbt(mtd, NULL)))
+	ret = this->scan_bbt(mtd);
+	if (ret)
 		return ret;
+
 	memset((char *)parts, 0, sizeof(parts));
 	numparts = inftl_partscan(mtd, parts);
 	/* At least for now, require the INFTL Media Header.  We could probably
@@ -1355,10 +1355,7 @@ static int __init inftl_scan_bbt(struct mtd_info *mtd)
 	   autopartitioning, but I want to give it more thought. */
 	if (!numparts)
 		return -EIO;
-	mtd_device_register(mtd, NULL, 0);
-	if (!no_autopart)
-		mtd_device_register(mtd, parts, numparts);
-	return 0;
+	return mtd_device_register(mtd, parts, no_autopart ? 0 : numparts);
 }
 
 static inline int __init doc2000_init(struct mtd_info *mtd)
@@ -1369,7 +1366,7 @@ static inline int __init doc2000_init(struct mtd_info *mtd)
 	this->read_byte = doc2000_read_byte;
 	this->write_buf = doc2000_writebuf;
 	this->read_buf = doc2000_readbuf;
-	this->scan_bbt = nftl_scan_bbt;
+	doc->late_init = nftl_scan_bbt;
 
 	doc->CDSNControl = CDSN_CTRL_FLASH_IO | CDSN_CTRL_ECC_IO;
 	doc2000_count_chips(mtd);
@@ -1396,13 +1393,13 @@ static inline int __init doc2001_init(struct mtd_info *mtd)
 		   can have multiple chips. */
 		doc2000_count_chips(mtd);
 		mtd->name = "DiskOnChip 2000 (INFTL Model)";
-		this->scan_bbt = inftl_scan_bbt;
+		doc->late_init = inftl_scan_bbt;
 		return (4 * doc->chips_per_floor);
 	} else {
 		/* Bog-standard Millennium */
 		doc->chips_per_floor = 1;
 		mtd->name = "DiskOnChip Millennium";
-		this->scan_bbt = nftl_scan_bbt;
+		doc->late_init = nftl_scan_bbt;
 		return 1;
 	}
 }
@@ -1415,7 +1412,7 @@ static inline int __init doc2001plus_init(struct mtd_info *mtd)
 	this->read_byte = doc2001plus_read_byte;
 	this->write_buf = doc2001plus_writebuf;
 	this->read_buf = doc2001plus_readbuf;
-	this->scan_bbt = inftl_scan_bbt;
+	doc->late_init = inftl_scan_bbt;
 	this->cmd_ctrl = NULL;
 	this->select_chip = doc2001plus_select_chip;
 	this->cmdfunc = doc2001plus_command;
@@ -1591,6 +1588,8 @@ static int __init doc_probe(unsigned long physadr)
 	nand->ecc.bytes		= 6;
 	nand->ecc.strength	= 2;
 	nand->bbt_options	= NAND_BBT_USE_FLASH;
+	/* Skip the automatic BBT scan so we can run it manually */
+	nand->options		|= NAND_SKIP_BBTSCAN;
 
 	doc->physadr		= physadr;
 	doc->virtadr		= virtadr;
@@ -1608,7 +1607,7 @@ static int __init doc_probe(unsigned long physadr)
 	else
 		numchips = doc2001_init(mtd);
 
-	if ((ret = nand_scan(mtd, numchips))) {
+	if ((ret = nand_scan(mtd, numchips)) || (ret = doc->late_init(mtd))) {
 		/* DBB note: i believe nand_release is necessary here, as
 		   buffers may have been allocated in nand_base.  Check with
 		   Thomas. FIX ME! */
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index e58af4bfa..793872f18 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -562,6 +562,7 @@ static int dma_xfer(struct fsmc_nand_data *host, void *buffer, int len,
 	dma_cookie_t cookie;
 	unsigned long flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 	int ret;
+	unsigned long time_left;
 
 	if (direction == DMA_TO_DEVICE)
 		chan = host->write_dma_chan;
@@ -601,14 +602,13 @@ static int dma_xfer(struct fsmc_nand_data *host, void *buffer, int len,
 
 	dma_async_issue_pending(chan);
 
-	ret =
+	time_left =
 	wait_for_completion_timeout(&host->dma_access_complete,
 				msecs_to_jiffies(3000));
-	if (ret <= 0) {
+	if (time_left == 0) {
 		dmaengine_terminate_all(chan);
 		dev_err(host->dev, "wait_for_completion_timeout\n");
-		if (!ret)
-			ret = -ETIMEDOUT;
+		ret = -ETIMEDOUT;
 		goto unmap_dma;
 	}
 
diff --git a/drivers/mtd/nand/mpc5121_nfc.c b/drivers/mtd/nand/mpc5121_nfc.c
index 1f12e5bfb..2a49b53c8 100644
--- a/drivers/mtd/nand/mpc5121_nfc.c
+++ b/drivers/mtd/nand/mpc5121_nfc.c
@@ -837,7 +837,7 @@ static int mpc5121_nfc_remove(struct platform_device *op)
 	return 0;
 }
 
-static struct of_device_id mpc5121_nfc_match[] = {
+static const struct of_device_id mpc5121_nfc_match[] = {
 	{ .compatible = "fsl,mpc5121-nfc", },
 	{},
 };
diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 372e0e38f..2426db88d 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -189,6 +189,7 @@ struct mxc_nand_host {
 	int			clk_act;
 	int			irq;
 	int			eccsize;
+	int			used_oobsize;
 	int			active_cs;
 
 	struct completion	op_completion;
@@ -280,12 +281,44 @@ static void memcpy32_fromio(void *trg, const void __iomem  *src, size_t size)
 		*t++ = __raw_readl(s++);
 }
 
+static void memcpy16_fromio(void *trg, const void __iomem  *src, size_t size)
+{
+	int i;
+	u16 *t = trg;
+	const __iomem u16 *s = src;
+
+	/* We assume that src (IO) is always 32bit aligned */
+	if (PTR_ALIGN(trg, 4) == trg && IS_ALIGNED(size, 4)) {
+		memcpy32_fromio(trg, src, size);
+		return;
+	}
+
+	for (i = 0; i < (size >> 1); i++)
+		*t++ = __raw_readw(s++);
+}
+
 static inline void memcpy32_toio(void __iomem *trg, const void *src, int size)
 {
 	/* __iowrite32_copy use 32bit size values so divide by 4 */
 	__iowrite32_copy(trg, src, size / 4);
 }
 
+static void memcpy16_toio(void __iomem *trg, const void *src, int size)
+{
+	int i;
+	__iomem u16 *t = trg;
+	const u16 *s = src;
+
+	/* We assume that trg (IO) is always 32bit aligned */
+	if (PTR_ALIGN(src, 4) == src && IS_ALIGNED(size, 4)) {
+		memcpy32_toio(trg, src, size);
+		return;
+	}
+
+	for (i = 0; i < (size >> 1); i++)
+		__raw_writew(*s++, t++);
+}
+
 static int check_int_v3(struct mxc_nand_host *host)
 {
 	uint32_t tmp;
@@ -807,32 +840,48 @@ static void mxc_nand_select_chip_v2(struct mtd_info *mtd, int chip)
 }
 
 /*
- * Function to transfer data to/from spare area.
+ * The controller splits a page into data chunks of 512 bytes + partial oob.
+ * There are writesize / 512 such chunks, the size of the partial oob parts is
+ * oobsize / #chunks rounded down to a multiple of 2. The last oob chunk then
+ * contains additionally the byte lost by rounding (if any).
+ * This function handles the needed shuffling between host->data_buf (which
+ * holds a page in natural order, i.e. writesize bytes data + oobsize bytes
+ * spare) and the NFC buffer.
  */
 static void copy_spare(struct mtd_info *mtd, bool bfrom)
 {
 	struct nand_chip *this = mtd->priv;
 	struct mxc_nand_host *host = this->priv;
-	u16 i, j;
-	u16 n = mtd->writesize >> 9;
+	u16 i, oob_chunk_size;
+	u16 num_chunks = mtd->writesize / 512;
+
 	u8 *d = host->data_buf + mtd->writesize;
 	u8 __iomem *s = host->spare0;
-	u16 t = host->devtype_data->spare_len;
+	u16 sparebuf_size = host->devtype_data->spare_len;
 
-	j = (mtd->oobsize / n >> 1) << 1;
+	/* size of oob chunk for all but possibly the last one */
+	oob_chunk_size = (host->used_oobsize / num_chunks) & ~1;
 
 	if (bfrom) {
-		for (i = 0; i < n - 1; i++)
-			memcpy32_fromio(d + i * j, s + i * t, j);
-
-		/* the last section */
-		memcpy32_fromio(d + i * j, s + i * t, mtd->oobsize - i * j);
+		for (i = 0; i < num_chunks - 1; i++)
+			memcpy16_fromio(d + i * oob_chunk_size,
+					s + i * sparebuf_size,
+					oob_chunk_size);
+
+		/* the last chunk */
+		memcpy16_fromio(d + i * oob_chunk_size,
+				s + i * sparebuf_size,
+				host->used_oobsize - i * oob_chunk_size);
 	} else {
-		for (i = 0; i < n - 1; i++)
-			memcpy32_toio(&s[i * t], &d[i * j], j);
-
-		/* the last section */
-		memcpy32_toio(&s[i * t], &d[i * j], mtd->oobsize - i * j);
+		for (i = 0; i < num_chunks - 1; i++)
+			memcpy16_toio(&s[i * sparebuf_size],
+				      &d[i * oob_chunk_size],
+				      oob_chunk_size);
+
+		/* the last chunk */
+		memcpy16_toio(&s[oob_chunk_size * sparebuf_size],
+			      &d[i * oob_chunk_size],
+			      host->used_oobsize - i * oob_chunk_size);
 	}
 }
 
@@ -911,6 +960,23 @@ static int get_eccsize(struct mtd_info *mtd)
 		return 8;
 }
 
+static void ecc_8bit_layout_4k(struct nand_ecclayout *layout)
+{
+	int i, j;
+
+	layout->eccbytes = 8*18;
+	for (i = 0; i < 8; i++)
+		for (j = 0; j < 18; j++)
+			layout->eccpos[i*18 + j] = i*26 + j + 7;
+
+	layout->oobfree[0].offset = 2;
+	layout->oobfree[0].length = 4;
+	for (i = 1; i < 8; i++) {
+		layout->oobfree[i].offset = i*26;
+		layout->oobfree[i].length = 7;
+	}
+}
+
 static void preset_v1(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd->priv;
@@ -1350,7 +1416,7 @@ static inline int is_imx53_nfc(struct mxc_nand_host *host)
 	return host->devtype_data == &imx53_nand_devtype_data;
 }
 
-static struct platform_device_id mxcnd_devtype[] = {
+static const struct platform_device_id mxcnd_devtype[] = {
 	{
 		.name = "imx21-nand",
 		.driver_data = (kernel_ulong_t) &imx21_nand_devtype_data,
@@ -1587,8 +1653,20 @@ static int mxcnd_probe(struct platform_device *pdev)
 
 	if (mtd->writesize == 2048)
 		this->ecc.layout = host->devtype_data->ecclayout_2k;
-	else if (mtd->writesize == 4096)
+	else if (mtd->writesize == 4096) {
 		this->ecc.layout = host->devtype_data->ecclayout_4k;
+		if (get_eccsize(mtd) == 8)
+			ecc_8bit_layout_4k(this->ecc.layout);
+	}
+
+	/*
+	 * Experimentation shows that i.MX NFC can only handle up to 218 oob
+	 * bytes. Limit used_oobsize to 218 so as to not confuse copy_spare()
+	 * into copying invalid data to/from the spare IO buffer, as this
+	 * might cause ECC data corruption when doing sub-page write to a
+	 * partially written page.
+	 */
+	host->used_oobsize = min(mtd->oobsize, 218U);
 
 	if (this->ecc.mode == NAND_ECC_HW) {
 		if (is_imx21_nfc(host) || is_imx27_nfc(host))
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index c2e1232cd..ceb68ca82 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1,6 +1,4 @@
 /*
- *  drivers/mtd/nand.c
- *
  *  Overview:
  *   This is the generic MTD driver for NAND flash devices. It should be
  *   capable of working with almost all NAND chips currently available.
@@ -48,6 +46,7 @@
 #include <linux/leds.h>
 #include <linux/io.h>
 #include <linux/mtd/partitions.h>
+#include <linux/of_mtd.h>
 
 /* Define default oob placement schemes for large and small page devices */
 static struct nand_ecclayout nand_oob_8 = {
@@ -2928,9 +2927,6 @@ static int nand_onfi_get_features(struct mtd_info *mtd, struct nand_chip *chip,
 	      & ONFI_OPT_CMD_SET_GET_FEATURES))
 		return -EINVAL;
 
-	/* clear the sub feature parameters */
-	memset(subfeature_param, 0, ONFI_SUBFEATURE_PARAM_LEN);
-
 	chip->cmdfunc(mtd, NAND_CMD_GET_FEATURES, addr, -1);
 	for (i = 0; i < ONFI_SUBFEATURE_PARAM_LEN; ++i)
 		*subfeature_param++ = chip->read_byte(mtd);
@@ -3689,7 +3685,7 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 			if (find_full_id_nand(mtd, chip, type, id_data, &busw))
 				goto ident_done;
 		} else if (*dev_id == type->dev_id) {
-				break;
+			break;
 		}
 	}
 
@@ -3798,6 +3794,39 @@ ident_done:
 	return type;
 }
 
+static int nand_dt_init(struct mtd_info *mtd, struct nand_chip *chip,
+			struct device_node *dn)
+{
+	int ecc_mode, ecc_strength, ecc_step;
+
+	if (of_get_nand_bus_width(dn) == 16)
+		chip->options |= NAND_BUSWIDTH_16;
+
+	if (of_get_nand_on_flash_bbt(dn))
+		chip->bbt_options |= NAND_BBT_USE_FLASH;
+
+	ecc_mode = of_get_nand_ecc_mode(dn);
+	ecc_strength = of_get_nand_ecc_strength(dn);
+	ecc_step = of_get_nand_ecc_step_size(dn);
+
+	if ((ecc_step >= 0 && !(ecc_strength >= 0)) ||
+	    (!(ecc_step >= 0) && ecc_strength >= 0)) {
+		pr_err("must set both strength and step size in DT\n");
+		return -EINVAL;
+	}
+
+	if (ecc_mode >= 0)
+		chip->ecc.mode = ecc_mode;
+
+	if (ecc_strength >= 0)
+		chip->ecc.strength = ecc_strength;
+
+	if (ecc_step > 0)
+		chip->ecc.size = ecc_step;
+
+	return 0;
+}
+
 /**
  * nand_scan_ident - [NAND Interface] Scan for the NAND device
  * @mtd: MTD device structure
@@ -3815,6 +3844,13 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
 	int i, nand_maf_id, nand_dev_id;
 	struct nand_chip *chip = mtd->priv;
 	struct nand_flash_dev *type;
+	int ret;
+
+	if (chip->dn) {
+		ret = nand_dt_init(mtd, chip, chip->dn);
+		if (ret)
+			return ret;
+	}
 
 	/* Set the default functions */
 	nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16);
diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 9bb8453d2..63a1a36a3 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -1,6 +1,4 @@
 /*
- *  drivers/mtd/nand_bbt.c
- *
  *  Overview:
  *   Bad block table support for the NAND driver
  *
@@ -64,7 +62,6 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/bbm.h>
 #include <linux/mtd/nand.h>
-#include <linux/mtd/nand_ecc.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/vmalloc.h>
@@ -720,7 +717,7 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
 		/* Must we save the block contents? */
 		if (td->options & NAND_BBT_SAVECONTENT) {
 			/* Make it block aligned */
-			to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1));
+			to &= ~(((loff_t)1 << this->bbt_erase_shift) - 1);
 			len = 1 << this->bbt_erase_shift;
 			res = mtd_read(mtd, to, len, &retlen, buf);
 			if (res < 0) {
@@ -1075,10 +1072,10 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd)
  * The bad block table memory is allocated here. It must be freed by calling
  * the nand_free_bbt function.
  */
-int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
+static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
 {
 	struct nand_chip *this = mtd->priv;
-	int len, res = 0;
+	int len, res;
 	uint8_t *buf;
 	struct nand_bbt_descr *td = this->bbt_td;
 	struct nand_bbt_descr *md = this->bbt_md;
@@ -1099,10 +1096,9 @@ int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
 	if (!td) {
 		if ((res = nand_memory_bbt(mtd, bd))) {
 			pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n");
-			kfree(this->bbt);
-			this->bbt = NULL;
+			goto err;
 		}
-		return res;
+		return 0;
 	}
 	verify_bbt_descr(mtd, td);
 	verify_bbt_descr(mtd, md);
@@ -1112,9 +1108,8 @@ int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
 	len += (len >> this->page_shift) * mtd->oobsize;
 	buf = vmalloc(len);
 	if (!buf) {
-		kfree(this->bbt);
-		this->bbt = NULL;
-		return -ENOMEM;
+		res = -ENOMEM;
+		goto err;
 	}
 
 	/* Is the bbt at a given page? */
@@ -1126,6 +1121,8 @@ int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
 	}
 
 	res = check_create(mtd, buf, bd);
+	if (res)
+		goto err;
 
 	/* Prevent the bbt regions from erasing / writing */
 	mark_bbt_region(mtd, td);
@@ -1133,6 +1130,11 @@ int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
 		mark_bbt_region(mtd, md);
 
 	vfree(buf);
+	return 0;
+
+err:
+	kfree(this->bbt);
+	this->bbt = NULL;
 	return res;
 }
 
diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
index dd620c19c..7124400d9 100644
--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -1,6 +1,4 @@
 /*
- *  drivers/mtd/nandids.c
- *
  *  Copyright (C) 2002 Thomas Gleixner (tglx@linutronix.de)
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index f2324271b..52c0c1a38 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -743,6 +743,11 @@ static int init_nandsim(struct mtd_info *mtd)
 			goto error;
 		}
 		ns->partitions[i].name   = get_partition_name(i);
+		if (!ns->partitions[i].name) {
+			NS_ERR("unable to allocate memory.\n");
+			ret = -ENOMEM;
+			goto error;
+		}
 		ns->partitions[i].offset = next_offset;
 		ns->partitions[i].size   = part_sz;
 		next_offset += ns->partitions[i].size;
@@ -756,6 +761,11 @@ static int init_nandsim(struct mtd_info *mtd)
 			goto error;
 		}
 		ns->partitions[i].name   = get_partition_name(i);
+		if (!ns->partitions[i].name) {
+			NS_ERR("unable to allocate memory.\n");
+			ret = -ENOMEM;
+			goto error;
+		}
 		ns->partitions[i].offset = next_offset;
 		ns->partitions[i].size   = remains;
 		ns->nbparts += 1;
diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c
index 3187c6b92..67a1b3f91 100644
--- a/drivers/mtd/nand/ndfc.c
+++ b/drivers/mtd/nand/ndfc.c
@@ -1,6 +1,4 @@
 /*
- *  drivers/mtd/ndfc.c
- *
  *  Overview:
  *   Platform independent driver for NDFC (NanD Flash Controller)
  *   integrated into EP440 cores
diff --git a/drivers/mtd/nand/plat_nand.c b/drivers/mtd/nand/plat_nand.c
index 4535c263f..717cf623f 100644
--- a/drivers/mtd/nand/plat_nand.c
+++ b/drivers/mtd/nand/plat_nand.c
@@ -24,8 +24,6 @@ struct plat_nand_data {
 	void __iomem		*io_base;
 };
 
-static const char *part_probe_types[] = { "cmdlinepart", NULL };
-
 /*
  * Probe for the NAND device.
  */
@@ -95,7 +93,7 @@ static int plat_nand_probe(struct platform_device *pdev)
 		goto out;
 	}
 
-	part_types = pdata->chip.part_probe_types ? : part_probe_types;
+	part_types = pdata->chip.part_probe_types;
 
 	ppdata.of_node = pdev->dev.of_node;
 	err = mtd_device_parse_register(&data->mtd, part_types, &ppdata,
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index a4615fcc3..1259cc558 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -22,13 +22,14 @@
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/irq.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_mtd.h>
 
-#if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP)
+#if defined(CONFIG_ARM) && (defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP))
 #define ARCH_HAS_DMA
 #endif
 
@@ -483,7 +484,8 @@ static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
 static void drain_fifo(struct pxa3xx_nand_info *info, void *data, int len)
 {
 	if (info->ecc_bch) {
-		int timeout;
+		u32 val;
+		int ret;
 
 		/*
 		 * According to the datasheet, when reading from NDDB
@@ -494,18 +496,14 @@ static void drain_fifo(struct pxa3xx_nand_info *info, void *data, int len)
 		 * the polling on the last read.
 		 */
 		while (len > 8) {
-			__raw_readsl(info->mmio_base + NDDB, data, 8);
-
-			for (timeout = 0;
-			     !(nand_readl(info, NDSR) & NDSR_RDDREQ);
-			     timeout++) {
-				if (timeout >= 5) {
-					dev_err(&info->pdev->dev,
-						"Timeout on RDDREQ while draining the FIFO\n");
-					return;
-				}
-
-				mdelay(1);
+			readsl(info->mmio_base + NDDB, data, 8);
+
+			ret = readl_relaxed_poll_timeout(info->mmio_base + NDSR, val,
+							 val & NDSR_RDDREQ, 1000, 5000);
+			if (ret) {
+				dev_err(&info->pdev->dev,
+					"Timeout on RDDREQ while draining the FIFO\n");
+				return;
 			}
 
 			data += 32;
@@ -513,7 +511,7 @@ static void drain_fifo(struct pxa3xx_nand_info *info, void *data, int len)
 		}
 	}
 
-	__raw_readsl(info->mmio_base + NDDB, data, len);
+	readsl(info->mmio_base + NDDB, data, len);
 }
 
 static void handle_data_pio(struct pxa3xx_nand_info *info)
@@ -522,14 +520,14 @@ static void handle_data_pio(struct pxa3xx_nand_info *info)
 
 	switch (info->state) {
 	case STATE_PIO_WRITING:
-		__raw_writesl(info->mmio_base + NDDB,
-			      info->data_buff + info->data_buff_pos,
-			      DIV_ROUND_UP(do_bytes, 4));
+		writesl(info->mmio_base + NDDB,
+			info->data_buff + info->data_buff_pos,
+			DIV_ROUND_UP(do_bytes, 4));
 
 		if (info->oob_size > 0)
-			__raw_writesl(info->mmio_base + NDDB,
-				      info->oob_buff + info->oob_buff_pos,
-				      DIV_ROUND_UP(info->oob_size, 4));
+			writesl(info->mmio_base + NDDB,
+				info->oob_buff + info->oob_buff_pos,
+				DIV_ROUND_UP(info->oob_size, 4));
 		break;
 	case STATE_PIO_READING:
 		drain_fifo(info,
@@ -1630,8 +1628,7 @@ static int alloc_nand_resource(struct platform_device *pdev)
 	info->pdev = pdev;
 	info->variant = pxa3xx_nand_get_variant(pdev);
 	for (cs = 0; cs < pdata->num_cs; cs++) {
-		mtd = (struct mtd_info *)((unsigned int)&info[1] +
-		      (sizeof(*mtd) + sizeof(*host)) * cs);
+		mtd = (void *)&info[1] + (sizeof(*mtd) + sizeof(*host)) * cs;
 		chip = (struct nand_chip *)(&mtd[1]);
 		host = (struct pxa3xx_nand_host *)chip;
 		info->host[cs] = host;
diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c
index baea83f4d..77e96d2df 100644
--- a/drivers/mtd/nand/r852.c
+++ b/drivers/mtd/nand/r852.c
@@ -653,11 +653,15 @@ static int r852_register_nand_device(struct r852_device *dev)
 	if (sm_register_device(dev->mtd, dev->sm))
 		goto error2;
 
-	if (device_create_file(&dev->mtd->dev, &dev_attr_media_type))
+	if (device_create_file(&dev->mtd->dev, &dev_attr_media_type)) {
 		message("can't create media type sysfs attribute");
+		goto error3;
+	}
 
 	dev->card_registred = 1;
 	return 0;
+error3:
+	nand_release(dev->mtd);
 error2:
 	kfree(dev->mtd);
 error1:
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 0e02be47c..381f67ac6 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -1105,7 +1105,7 @@ static int s3c24xx_nand_resume(struct platform_device *dev)
 
 /* driver device registration */
 
-static struct platform_device_id s3c24xx_driver_ids[] = {
+static const struct platform_device_id s3c24xx_driver_ids[] = {
 	{
 		.name		= "s3c2410-nand",
 		.driver_data	= TYPE_S3C2410,
diff --git a/drivers/mtd/nand/xway_nand.c b/drivers/mtd/nand/xway_nand.c
index 3f81dc8f2..3b28db458 100644
--- a/drivers/mtd/nand/xway_nand.c
+++ b/drivers/mtd/nand/xway_nand.c
@@ -160,14 +160,10 @@ static int xway_nand_probe(struct platform_device *pdev)
 	return 0;
 }
 
-/* allow users to override the partition in DT using the cmdline */
-static const char *part_probes[] = { "cmdlinepart", "ofpart", NULL };
-
 static struct platform_nand_data xway_nand_data = {
 	.chip = {
 		.nr_chips		= 1,
 		.chip_delay		= 30,
-		.part_probe_types	= part_probes,
 	},
 	.ctrl = {
 		.probe		= xway_nand_probe,