openwrt/target/linux/brcm47xx/patches-3.2/030-bcm47xx-bcma-nandflash.patch

--- a/arch/mips/bcm47xx/bus.c
+++ b/arch/mips/bcm47xx/bus.c
@@ -2,6 +2,7 @@
  * BCM947xx nvram variable access
  *
  * Copyright (C) 2011 Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright (C) 2011-2012 Tathagata Das <tathagata@alumnux.com>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
@@ -92,3 +93,9 @@ void bcm47xx_sflash_struct_ssb_init(stru
 	sflash->numblocks = scc->sflash.numblocks;
 	sflash->size = scc->sflash.size;
 }
+
+void bcm47xx_nflash_struct_bcma_init(struct bcm47xx_nflash *nflash, struct bcma_drv_cc *bcc)
+{
+	nflash->nflash_type = BCM47XX_BUS_TYPE_BCMA;
+	nflash->bcc = bcc;
+}
--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2005 Broadcom Corporation
  * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  * Copyright (C) 2010-2011 Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright (C) 2011-2012 Tathagata Das <tathagata@alumnux.com>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
@@ -21,6 +22,7 @@
 #include <asm/mach-bcm47xx/nvram.h>
 #include <asm/mach-bcm47xx/bcm47xx.h>
 #include <asm/mach-bcm47xx/bus.h>
+#include <linux/mtd/bcm47xx_nand.h>
 
 static char nvram_buf[NVRAM_SPACE];
 
@@ -137,6 +139,51 @@ found:
 	return 0;
 }
 
+static int early_nvram_init_nflash(void)
+{
+	struct nvram_header *header;
+	u32 off;
+	int ret;
+	int len;
+	u32 flash_size = bcm47xx_nflash.size;
+	u8 tmpbuf[NFL_SECTOR_SIZE];
+	int i;
+	u32 *src, *dst;
+
+	/* check if the struct is already initilized */
+	if (!flash_size)
+		return -1;
+	
+	cfe_env = 0;
+
+	off = FLASH_MIN;
+	while (off <= flash_size) {
+		ret = bcma_nflash_read(bcm47xx_nflash.bcc, off, NFL_SECTOR_SIZE, tmpbuf);
+		if (ret != NFL_SECTOR_SIZE)
+			goto done;
+		header = (struct nvram_header *)tmpbuf;
+		if (header->magic == NVRAM_HEADER)
+			goto found;
+		off <<= 1;
+	}
+
+	ret = -1;
+	goto done;
+
+found:
+	len = header->len;
+	header = (struct nvram_header *) KSEG1ADDR(NAND_FLASH1 + off);
+	src = (u32 *) header;
+	dst = (u32 *) nvram_buf;
+	for (i = 0; i < sizeof(struct nvram_header); i += 4)
+		*dst++ = *src++;
+	for (; i < len && i < NVRAM_SPACE; i += 4)
+		*dst++ = *src++;
+	ret = 0;
+done:
+	return ret;
+}
+
 static void early_nvram_init(void)
 {
 	int err = 0;
@@ -163,6 +210,10 @@ static void early_nvram_init(void)
 			err = early_nvram_init_sflash();
 			if (err < 0)
 				printk(KERN_WARNING "can not read from flash: %i\n", err);
+		} else if (bcm47xx_bus.bcma.bus.drv_cc.flash_type == BCMA_NFLASH) {
+			err = early_nvram_init_nflash();
+			if (err < 0)
+				printk(KERN_WARNING "can not read from nflash: %i\n", err);
 		} else {
 			printk(KERN_WARNING "unknow flash type\n");
 		}
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -4,6 +4,7 @@
  *  Copyright (C) 2006 Michael Buesch <m@bues.ch>
  *  Copyright (C) 2010 Waldemar Brodkorb <wbx@openadk.org>
  *  Copyright (C) 2010-2011 Hauke Mehrtens <hauke@hauke-m.de>
+ *  Copyright (C) 2011-2012 Tathagata Das <tathagata@alumnux.com>
  *
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
@@ -46,6 +47,7 @@ enum bcm47xx_bus_type bcm47xx_bus_type;
 EXPORT_SYMBOL(bcm47xx_bus_type);
 
 struct bcm47xx_sflash bcm47xx_sflash;
+struct bcm47xx_nflash bcm47xx_nflash;
 
 static void bcm47xx_machine_restart(char *command)
 {
@@ -325,6 +327,9 @@ static void __init bcm47xx_register_bcma
 
 	if (bcm47xx_bus.bcma.bus.drv_cc.flash_type == BCMA_SFLASH)
 		bcm47xx_sflash_struct_bcma_init(&bcm47xx_sflash, &bcm47xx_bus.bcma.bus.drv_cc);
+	
+	if (bcm47xx_bus.bcma.bus.drv_cc.flash_type == BCMA_NFLASH)
+		bcm47xx_nflash_struct_bcma_init(&bcm47xx_nflash, &bcm47xx_bus.bcma.bus.drv_cc);
 }
 #endif
 
@@ -395,6 +400,19 @@ static struct platform_device bcm47xx_sf
 	.num_resources	= 1,
 };
 
+static struct resource bcm47xx_nflash_resource = {
+	.name	= "bcm47xx_nflash",
+	.start	= 0,
+	.end	= 0,
+	.flags  = 0,
+};
+
+static struct platform_device bcm47xx_nflash_dev = {
+	.name		= "bcm47xx_nflash",
+	.resource	= &bcm47xx_nflash_resource,
+	.num_resources	= 1,
+};
+
 static int __init bcm47xx_register_flash(void)
 {
 #ifdef CONFIG_BCM47XX_SSB
@@ -429,6 +447,9 @@ static int __init bcm47xx_register_flash
 		} else if (drv_cc->flash_type == BCMA_SFLASH) {
 			bcm47xx_sflash_dev.dev.platform_data = &bcm47xx_sflash;
 			return platform_device_register(&bcm47xx_sflash_dev);
+		} else if (drv_cc->flash_type == BCMA_NFLASH) {
+			bcm47xx_nflash_dev.dev.platform_data = &bcm47xx_nflash;
+			return platform_device_register(&bcm47xx_nflash_dev);
 		} else {
 			printk(KERN_ERR "No flash device found\n");
 			return -1;
--- a/arch/mips/include/asm/mach-bcm47xx/bus.h
+++ b/arch/mips/include/asm/mach-bcm47xx/bus.h
@@ -2,6 +2,7 @@
  * BCM947xx nvram variable access
  *
  * Copyright (C) 2011 Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright (C) 2011-2012 Tathagata Das <tathagata@alumnux.com>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
@@ -13,6 +14,7 @@
 #include <linux/bcma/bcma.h>
 #include <linux/mtd/mtd.h>
 #include <bcm47xx.h>
+#include <linux/mtd/nand.h>
 
 struct bcm47xx_sflash {
 	enum bcm47xx_bus_type sflash_type;
@@ -38,3 +40,18 @@ void bcm47xx_sflash_struct_bcma_init(str
 void bcm47xx_sflash_struct_ssb_init(struct bcm47xx_sflash *sflash, struct ssb_chipcommon *scc);
 
 extern struct bcm47xx_sflash bcm47xx_sflash;
+
+struct bcm47xx_nflash {
+	enum bcm47xx_bus_type nflash_type;
+	struct bcma_drv_cc *bcc;
+
+	u32 size;		/* Total size in bytes */
+	u32 next_opcode; /* Next expected command from upper NAND layer */
+
+	struct mtd_info mtd;
+	struct nand_chip nand;
+};
+
+void bcm47xx_nflash_struct_bcma_init(struct bcm47xx_nflash *nflash, struct bcma_drv_cc *bcc);
+
+extern struct bcm47xx_nflash bcm47xx_nflash;
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -46,6 +46,11 @@ u32 bcma_pmu_get_clockcpu(struct bcma_dr
 int bcma_sflash_init(struct bcma_drv_cc *cc);
 #endif /* CONFIG_BCMA_SFLASH */
 
+#ifdef CONFIG_BCMA_NFLASH
+/* driver_chipcommon_nflash.c */
+int bcma_nflash_init(struct bcma_drv_cc *cc);
+#endif /* CONFIG_BCMA_NFLASH */
+
 #ifdef CONFIG_BCMA_HOST_PCI
 /* host_pci.c */
 extern int __init bcma_host_pci_init(void);
--- /dev/null
+++ b/drivers/bcma/driver_chipcommon_nflash.c
@@ -0,0 +1,154 @@
+/*
+ * BCMA nand flash interface
+ *
+ * Copyright 2011, Tathagata Das <tathagata@alumnux.com>
+ * Copyright 2010, Broadcom Corporation
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include <linux/bcma/bcma.h>
+#include <linux/bcma/bcma_driver_chipcommon.h>
+#include <linux/delay.h>
+#include <linux/mtd/bcm47xx_nand.h>
+#include <linux/mtd/nand.h>
+
+#include "bcma_private.h"
+
+/* Issue a nand flash command */
+static inline void bcma_nflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
+{
+	bcma_cc_write32(cc, NAND_CMD_START, opcode);
+	bcma_cc_read32(cc,  NAND_CMD_START);
+}
+
+/* Check offset and length */
+static int bcma_nflash_offset_is_valid(struct bcma_drv_cc *cc, u32 offset, u32 len, u32 mask)
+{
+	if ((offset & mask) != 0 || (len & mask) != 0) {
+		pr_err("%s(): Address is not aligned. offset: %x, len: %x, mask: %x\n", __func__, offset, len, mask);
+		return 1;
+	}
+
+	if ((((offset + len) >> 20) >= cc->nflash.size) &&
+		(((offset + len) & ((1 << 20) - 1)) != 0)) {
+		pr_err("%s(): Address is outside Flash memory region. offset: %x, len: %x, mask: %x\n", __func__, offset, len, mask);
+		return 1;
+	}
+
+	return 0;
+}
+
+/* Read len bytes starting at offset into buf. Returns number of bytes read. */
+int bcma_nflash_read(struct bcma_drv_cc *cc, u32 offset, u32 len, u8 *buf)
+{
+	u32 mask;
+	int i;
+	u32 *to, val, res;
+
+	mask = NFL_SECTOR_SIZE - 1;
+	if (bcma_nflash_offset_is_valid(cc, offset, len, mask))
+		return 0;
+
+	to = (u32 *)buf;
+	res = len;
+	while (res > 0) {
+		bcma_cc_write32(cc, NAND_CMD_ADDR, offset);
+		bcma_nflash_cmd(cc, NCMD_PAGE_RD);
+		if (bcma_nflash_poll(cc) < 0)
+			break;
+		val = bcma_cc_read32(cc, NAND_INTFC_STATUS);
+		if ((val & NIST_CACHE_VALID) == 0)
+			break;
+		bcma_cc_write32(cc, NAND_CACHE_ADDR, 0);
+		for (i = 0; i < NFL_SECTOR_SIZE; i += 4, to++) {
+			*to = bcma_cc_read32(cc, NAND_CACHE_DATA);
+		}
+		res -= NFL_SECTOR_SIZE;
+		offset += NFL_SECTOR_SIZE;
+	}
+	return (len - res);
+}
+
+#define NF_RETRIES   1000000
+
+/* Poll for command completion. Returns zero when complete. */
+int bcma_nflash_poll(struct bcma_drv_cc *cc)
+{
+	u32 retries = NF_RETRIES;
+	u32 pollmask = NIST_CTRL_READY|NIST_FLASH_READY;
+	u32 mask;
+
+	while (retries--) {
+		mask = bcma_cc_read32(cc, NAND_INTFC_STATUS) & pollmask;
+		if (mask == pollmask)
+			return 0;
+		cpu_relax();
+	}
+
+	if (!retries) {
+		pr_err("bcma_nflash_poll: not ready\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/* Write len bytes starting at offset into buf. Returns success (0) or failure (!0).
+ * Should poll for completion.
+ */
+int bcma_nflash_write(struct bcma_drv_cc *cc, u32 offset, u32 len,
+			    const u8 *buf)
+{
+	u32 mask;
+	int i;
+	u32 *from, res, reg;
+
+	mask = cc->nflash.pagesize - 1;
+	if (bcma_nflash_offset_is_valid(cc, offset, len, mask))
+		return 1;
+	
+	/* disable partial page enable */
+	reg = bcma_cc_read32(cc, NAND_ACC_CONTROL);
+	reg &= ~NAC_PARTIAL_PAGE_EN;
+	bcma_cc_write32(cc, NAND_ACC_CONTROL, reg);
+
+	from = (u32 *)buf;
+	res = len;
+	while (res > 0) {
+		bcma_cc_write32(cc, NAND_CACHE_ADDR, 0);
+		for (i = 0; i < cc->nflash.pagesize; i += 4, from++) {
+			if (i % 512 == 0)
+				bcma_cc_write32(cc, NAND_CMD_ADDR, i);
+			bcma_cc_write32(cc, NAND_CACHE_DATA, *from);
+		}
+		bcma_cc_write32(cc, NAND_CMD_ADDR, offset + cc->nflash.pagesize - 512);
+		bcma_nflash_cmd(cc, NCMD_PAGE_PROG);
+		if (bcma_nflash_poll(cc) < 0)
+			break;
+		res -= cc->nflash.pagesize;
+		offset += cc->nflash.pagesize;
+	}
+
+	if (res <= 0)
+		return 0;
+	else
+		return (len - res);
+}
+
+/* Erase a region. Returns success (0) or failure (-1). 
+ * Poll for completion.
+ */
+int bcma_nflash_erase(struct bcma_drv_cc *cc, u32 offset)
+{
+	if ((offset >> 20) >= cc->nflash.size)
+		return -1;
+	if ((offset & (cc->nflash.blocksize - 1)) != 0)
+		return -1;
+
+	bcma_cc_write32(cc, NAND_CMD_ADDR, offset);
+	bcma_nflash_cmd(cc, NCMD_BLOCK_ERASE);
+	if (bcma_nflash_poll(cc) < 0)
+		return -1;
+	return 0;
+}
--- a/drivers/bcma/driver_mips.c
+++ b/drivers/bcma/driver_mips.c
@@ -6,6 +6,7 @@
  * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
  * Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
  * Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright (C) 2011-2012 Tathagata Das <tathagata@alumnux.com>
  *
  * Licensed under the GNU/GPL. See COPYING for details.
  */
@@ -182,6 +183,17 @@ static void bcma_core_mips_flash_detect(
 {
 	struct bcma_bus *bus = mcore->core->bus;
 
+	if (bus->drv_cc.core->id.rev == 38 
+		&& (bus->drv_cc.status & (1 << 4)) != 0) {
+#ifdef CONFIG_BCMA_NFLASH
+		pr_info("found nand flash.\n");
+		bus->drv_cc.flash_type = BCMA_NFLASH;
+#else
+		pr_info("NAND flash not supported.\n");
+#endif
+		return;
+	}
+
 	switch (bus->drv_cc.capabilities & BCMA_CC_CAP_FLASHT) {
 	case BCMA_CC_FLASHT_STSER:
 	case BCMA_CC_FLASHT_ATSER:
--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -43,6 +43,11 @@ config BCMA_SFLASH
 	depends on BCMA_DRIVER_MIPS
 	default y
 
+config BCMA_NFLASH
+	bool
+	depends on BCMA_DRIVER_MIPS
+	default y
+
 config BCMA_DRIVER_MIPS
 	bool "BCMA Broadcom MIPS core driver"
 	depends on BCMA && MIPS
--- a/drivers/bcma/Makefile
+++ b/drivers/bcma/Makefile
@@ -1,6 +1,7 @@
 bcma-y					+= main.o scan.o core.o sprom.o
 bcma-y					+= driver_chipcommon.o driver_chipcommon_pmu.o
 bcma-$(CONFIG_BCMA_SFLASH)		+= driver_chipcommon_sflash.o
+bcma-$(CONFIG_BCMA_NFLASH)		+= driver_chipcommon_nflash.o
 bcma-y					+= driver_pci.o
 bcma-$(CONFIG_BCMA_DRIVER_PCI_HOSTMODE)	+= driver_pci_host.o
 bcma-$(CONFIG_BCMA_DRIVER_MIPS)		+= driver_mips.o
--- /dev/null
+++ b/drivers/mtd/nand/bcm47xx_nand.c
@@ -0,0 +1,506 @@
+/*
+ * BCMA nand flash interface
+ *
+ * Copyright (C) 2011-2012 Tathagata Das <tathagata@alumnux.com>
+ * Copyright 2010, Broadcom Corporation
+ *
+ * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
+ * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
+ * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
+ *
+ */
+
+#define pr_fmt(fmt) "bcm47xx_nflash: " fmt
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <bcm47xx.h>
+#include <bus.h>
+#include <linux/cramfs_fs.h>
+#include <linux/romfs_fs.h>
+#include <linux/magic.h>
+#include <linux/byteorder/generic.h>
+#include <linux/mtd/bcm47xx_nand.h>
+#include <linux/mtd/nand.h>
+
+static int bcm47xx_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip);
+static int bcm47xx_erase(struct mtd_info *mtd, unsigned int addr, unsigned int len);
+
+/* Private Global variable */
+static u32 read_offset = 0;
+static u32 write_offset;
+
+static int
+nflash_mtd_poll(struct bcm47xx_nflash *nflash, unsigned int offset, int timeout)
+{
+	unsigned long now = jiffies;
+	int ret = 0;
+
+	for (;;) {
+		if (!bcma_nflash_poll(nflash->bcc)) {
+			ret = 0;
+			break;
+		}
+		if (time_after(jiffies, now + timeout)) {
+			pr_err("timeout while polling\n");
+			ret = -ETIMEDOUT;
+			break;
+		}
+		udelay(1);
+	}
+
+	return ret;
+}
+
+static int
+bcm47xx_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
+{
+	struct nand_chip *nchip = (struct nand_chip *)mtd->priv;
+	struct bcm47xx_nflash *nflash = (struct bcm47xx_nflash *)nchip->priv;
+	int bytes, ret = 0;
+	u32 extra = 0;
+	u8 *tmpbuf = NULL;
+	int size;
+	u32 offset, blocksize, mask, off;
+	u32 skip_bytes = 0;
+	int need_copy = 0;
+	u8 *ptr = NULL;
+
+	/* Check address range */
+	if (!len)
+		return 0;
+	if ((from + len) > mtd->size)
+		return -EINVAL;
+	offset = from;
+	if ((offset & (NFL_SECTOR_SIZE - 1)) != 0) {
+		extra = offset & (NFL_SECTOR_SIZE - 1);
+		offset -= extra;
+		len += extra;
+		need_copy = 1;
+	}
+	size = (len + (NFL_SECTOR_SIZE - 1)) & ~(NFL_SECTOR_SIZE - 1);
+	if (size != len) {
+		need_copy = 1;
+	}
+	if (!need_copy) {
+		ptr = buf;
+	} else {
+		tmpbuf = (u8 *)kmalloc(size, GFP_KERNEL);
+		ptr = tmpbuf;
+	}
+
+	blocksize = mtd->erasesize;
+	mask = blocksize - 1;
+	*retlen = 0;
+	while (len > 0) {
+		off = offset + skip_bytes;
+		if ((bytes = bcma_nflash_read(nflash->bcc, off, NFL_SECTOR_SIZE, ptr)) < 0) {
+			ret = bytes;
+			goto done;
+		}
+		if (bytes > len)
+			bytes = len;
+		offset += bytes;
+		len -= bytes;
+		ptr += bytes;
+		*retlen += bytes;
+	}
+
+done:
+	if (tmpbuf) {
+		*retlen -= extra;
+		memcpy(buf, tmpbuf+extra, *retlen);
+		kfree(tmpbuf);
+	}
+
+	return ret;
+}
+
+static void bcm47xx_write(struct mtd_info *mtd, u32 to, const u_char *buf, u32 len)
+{
+	struct nand_chip *nchip = (struct nand_chip *)mtd->priv;
+	struct bcm47xx_nflash *nflash = (struct bcm47xx_nflash *)nchip->priv;
+	u32 offset, blocksize, mask, off;
+	int read_len;
+	u32 copy_len, write_len, from;
+	u_char *write_ptr, *block;
+	const u_char *ptr;
+	int ret, bytes;
+
+	/* Check address range */
+	if (!len) {
+		pr_err("Error: Attempted to write too small data\n");
+		return;
+	}
+
+	if (!to)
+		return;
+
+	if ((to + len) > mtd->size) {
+		pr_err("Error: Attempted to write too large data\n");
+		return;
+	}
+
+	ptr = buf;
+	block = NULL;
+	offset = to;
+	blocksize = mtd->erasesize;
+	if (!(block = kmalloc(blocksize, GFP_KERNEL)))
+		return;
+	mask = blocksize - 1;
+	while (len) {
+		/* Align offset */
+		from = offset & ~mask;
+		/* Copy existing data into holding block if necessary */
+		if (((offset & (blocksize-1)) != 0) || (len < blocksize)) {
+			if ((ret = bcm47xx_read(mtd, from, blocksize, &read_len, block)))
+				goto done;
+			if (read_len != blocksize) {
+				ret = -EINVAL;
+				goto done;
+			}
+		}
+	
+		/* Copy input data into holding block */
+		copy_len = min(len, blocksize - (offset & mask));
+		memcpy(block + (offset & mask), ptr, copy_len);
+		off = (uint) from;
+		/* Erase block */
+		if ((ret = bcm47xx_erase(mtd, off, blocksize)) < 0)
+			goto done;
+		/* Write holding block */
+		write_ptr = block;
+		write_len = blocksize;
+		if ((bytes = bcma_nflash_write(nflash->bcc, (uint)from, (uint)write_len, (u8 *) write_ptr)) != 0) {
+			ret = bytes;
+			goto done;
+		}
+		offset += copy_len;
+		if (len < copy_len)
+			len = 0;
+		else
+			len -= copy_len;
+		ptr += copy_len;
+	}
+
+done:
+	if (block)
+		kfree(block);
+	return;
+}
+
+static int bcm47xx_erase(struct mtd_info *mtd, unsigned int addr, unsigned int len)
+{
+	struct nand_chip *nchip = (struct nand_chip *)mtd->priv;
+	struct bcm47xx_nflash *nflash = (struct bcm47xx_nflash *)nchip->priv;
+
+	/* Check address range */
+	if (!len)
+		return 1;
+	if ((addr + len) > mtd->size)
+		return 1;
+
+	if (bcma_nflash_erase(nflash->bcc, addr)) {
+		pr_err("ERASE: nflash erase error\n");
+		return 1;
+	}
+
+	if (nflash_mtd_poll(nflash, addr, 10 * HZ)) {
+		pr_err("ERASE: nflash_mtd_poll error\n");
+		return 1;
+	}
+	
+	return 0;
+}
+
+/* This functions is used by upper layer to checks if device is ready */
+static int bcm47xx_dev_ready(struct mtd_info *mtd)
+{
+	return 1;
+}
+
+/* Issue a nand flash command */
+static inline void bcm47xx_nflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
+{
+	bcma_cc_write32(cc, NAND_CMD_START, opcode);
+	bcma_cc_read32(cc,  NAND_CMD_START);
+}
+
+static void bcm47xx_command(struct mtd_info *mtd, unsigned command,
+				int column, int page_addr)
+{
+	struct nand_chip *nchip = (struct nand_chip *)mtd->priv;
+	struct bcm47xx_nflash *nflash = (struct bcm47xx_nflash *)nchip->priv;
+	u32 pagesize = 1 << nchip->page_shift;
+
+	/* Command pre-processing step */
+	switch (command) {
+	case NAND_CMD_RESET:
+		bcm47xx_nflash_cmd(nflash->bcc, NCMD_FLASH_RESET);
+		break;
+
+	case NAND_CMD_STATUS:
+		nflash->next_opcode = NAND_CMD_STATUS;
+		read_offset = 0;
+		write_offset = 0;
+		break;
+
+	case NAND_CMD_READ0:
+		read_offset = page_addr * pagesize;
+		nflash->next_opcode = 0;
+		break;
+
+	case NAND_CMD_READOOB:
+		read_offset = page_addr * pagesize;
+		nflash->next_opcode = 0;
+		break;
+
+	case NAND_CMD_SEQIN:
+		write_offset = page_addr * pagesize;
+		nflash->next_opcode = 0;
+		break;
+
+	case NAND_CMD_PAGEPROG:
+		nflash->next_opcode = 0;
+		break;
+
+	case NAND_CMD_READID:
+		read_offset = column;
+		bcm47xx_nflash_cmd(nflash->bcc, NCMD_ID_RD);
+		nflash->next_opcode = NAND_DEVID;
+		break;
+
+	case NAND_CMD_ERASE1:
+		nflash->next_opcode = 0;
+		bcm47xx_erase(mtd, page_addr*pagesize, pagesize);
+		break;
+	
+	case NAND_CMD_ERASE2:
+		break;
+
+	case NAND_CMD_RNDOUT:
+		if (column > mtd->writesize)
+			read_offset += (column - mtd->writesize);
+		else 
+			read_offset += column;
+		break;
+
+	default:
+		pr_err("COMMAND not supported %x\n", command);
+		nflash->next_opcode = 0;
+		break;
+	}
+}
+
+/* This function is used by upper layer for select and
+ * deselect of the NAND chip.
+ * It is dummy function. */
+static void bcm47xx_select_chip(struct mtd_info *mtd, int chip)
+{
+}
+
+static u_char bcm47xx_read_byte(struct mtd_info *mtd)
+{
+	struct nand_chip *nchip = mtd->priv;
+	struct bcm47xx_nflash *nflash = (struct bcm47xx_nflash *)nchip->priv;
+	uint8_t ret = 0;
+	static u32 id;
+
+	if (nflash->next_opcode == 0)
+		return ret;
+
+	if (nflash->next_opcode == NAND_CMD_STATUS)
+		return NAND_STATUS_WP; 
+
+	id = bcma_cc_read32(nflash->bcc, nflash->next_opcode);
+
+	if (nflash->next_opcode == NAND_DEVID) {
+		ret = (id >> (8*read_offset)) & 0xff;
+		read_offset++;
+	}
+
+	return ret;
+}
+
+static uint16_t bcm47xx_read_word(struct mtd_info *mtd)
+{
+	loff_t from = read_offset;
+	uint16_t buf = 0;
+	int bytes;
+
+	bcm47xx_read(mtd, from, sizeof(buf), &bytes, (u_char *)&buf);
+	return buf;
+}
+
+/* Write data of length len to buffer buf. The data to be
+ * written on NAND Flash is first copied to RAMbuffer. After the Data Input
+ * Operation by the NFC, the data is written to NAND Flash */
+static void bcm47xx_write_buf(struct mtd_info *mtd,
+				const u_char *buf, int len)
+{
+	bcm47xx_write(mtd, write_offset, buf, len);
+}
+
+/* Read the data buffer from the NAND Flash. To read the data from NAND
+ * Flash first the data output cycle is initiated by the NFC, which copies
+ * the data to RAMbuffer. This data of length len is then copied to buffer buf.
+ */
+static void bcm47xx_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+	loff_t from = read_offset;
+	int bytes;
+
+	bcm47xx_read(mtd, from, len, &bytes, buf);
+}
+
+/* Used by the upper layer to verify the data in NAND Flash
+ * with the data in the buf. */
+static int bcm47xx_verify_buf(struct mtd_info *mtd,
+				const u_char *buf, int len)
+{
+	return -EFAULT;
+}
+
+static int bcm47xx_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
+{
+	struct nand_chip *nchip = mtd->priv;
+	struct bcm47xx_nflash *nflash = (struct bcm47xx_nflash *)nchip->priv;
+	int i;
+	uint off;
+	u32 pagesize = 1 << nchip->page_shift;
+	u32 blocksize = mtd->erasesize;
+
+	if ((ofs >> 20) >= nflash->size)
+		return 1;
+	if ((ofs & (blocksize - 1)) != 0)
+		return 1;
+
+	for (i = 0; i < 2; i++) {
+		off = ofs + pagesize;
+		bcma_cc_write32(nflash->bcc, NAND_CMD_ADDR, off);
+		bcm47xx_nflash_cmd(nflash->bcc, NCMD_SPARE_RD);
+		if (bcma_nflash_poll(nflash->bcc) < 0)
+			break;
+		if ((bcma_cc_read32(nflash->bcc, NAND_INTFC_STATUS) & NIST_SPARE_VALID) != NIST_SPARE_VALID)
+			return 1;
+		if ((bcma_cc_read32(nflash->bcc, NAND_SPARE_RD0) & 0xff) != 0xff)
+			return 1;
+	}
+	return 0;
+}
+
+const char *part_probes[] = { "cmdlinepart", NULL };
+static int bcm47xx_probe(struct platform_device *pdev)
+{
+	struct nand_chip *nchip;
+	struct mtd_info *mtd;
+	struct bcm47xx_nflash *nflash = dev_get_platdata(&pdev->dev);
+	int ret = 0;
+
+	mtd = &nflash->mtd;
+	nchip = &nflash->nand;
+
+	/* Register with MTD */
+	mtd->priv = nchip;
+	mtd->owner = THIS_MODULE;
+	mtd->dev.parent = &pdev->dev;
+
+	/* 50 us command delay time */
+	nchip->chip_delay = 50;
+
+	nchip->priv = nflash;
+	nchip->dev_ready = bcm47xx_dev_ready;
+	nchip->cmdfunc = bcm47xx_command;
+	nchip->select_chip = bcm47xx_select_chip;
+	nchip->read_byte = bcm47xx_read_byte;
+	nchip->read_word = bcm47xx_read_word;
+	nchip->write_buf = bcm47xx_write_buf;
+	nchip->read_buf = bcm47xx_read_buf;
+	nchip->verify_buf = bcm47xx_verify_buf;
+	nchip->block_bad = bcm47xx_block_bad;
+	nchip->options = NAND_SKIP_BBTSCAN;
+
+	/* Not known */
+	nchip->ecc.mode = NAND_ECC_NONE;
+
+	/* first scan to find the device and get the page size */
+	if (nand_scan_ident(mtd, 1, NULL)) {
+		pr_err("nand_scan_ident failed\n");
+		ret = -ENXIO;
+		goto done;
+	}
+	nflash->bcc->nflash.size = mtd->size;
+	nflash->bcc->nflash.pagesize = 1 << nchip->page_shift;
+	nflash->bcc->nflash.blocksize = mtd->erasesize;
+	bcm47xx_nflash.size = mtd->size;
+
+	/* second phase scan */
+	if (nand_scan_tail(mtd)) {
+		pr_err("nand_scan_tail failed\n");
+		ret = -ENXIO;
+		goto done;
+	}
+
+	mtd->name = "bcm47xx-nflash";
+	mtd->flags |= MTD_WRITEABLE;
+	ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL, 0);
+
+	if (ret) {
+		pr_err("mtd_device_register failed\n");
+		return ret;
+	}
+	
+	return 0;
+
+done:
+	return ret;
+}
+
+static int __devexit bcm47xx_remove(struct platform_device *pdev)
+{
+	struct bcm47xx_nflash *nflash = dev_get_platdata(&pdev->dev);
+	struct mtd_info *mtd = &nflash->mtd;
+
+	if (nflash) {
+		/* Release resources, unregister device */
+		nand_release(mtd);
+	}
+
+	return 0;
+}
+
+static struct platform_driver bcm47xx_driver = {
+	.remove = __devexit_p(bcm47xx_remove),
+	.driver = {
+		.name = "bcm47xx_nflash",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init init_bcm47xx_nflash(void)
+{
+	int ret = platform_driver_probe(&bcm47xx_driver, bcm47xx_probe);
+
+	if (ret)
+		pr_err("error registering platform driver: %i\n", ret);
+	return ret;
+}
+
+static void __exit exit_bcm47xx_nflash(void)
+{
+	platform_driver_unregister(&bcm47xx_driver);
+}
+
+module_init(init_bcm47xx_nflash);
+module_exit(exit_bcm47xx_nflash);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("BCM47XX NAND flash driver");
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -537,4 +537,12 @@ config MTD_NAND_FSMC
 	  Enables support for NAND Flash chips on the ST Microelectronics
 	  Flexible Static Memory Controller (FSMC)
 
+config MTD_NAND_BCM47XX
+	tristate "bcm47xx nand flash support"
+	default y
+	depends on BCM47XX
+	select MTD_PARTITIONS
+	help
+	  Support for bcm47xx nand flash
+
 endif # MTD_NAND
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -49,5 +49,6 @@ obj-$(CONFIG_MTD_NAND_MPC5121_NFC)	+= mp
 obj-$(CONFIG_MTD_NAND_RICOH)		+= r852.o
 obj-$(CONFIG_MTD_NAND_JZ4740)		+= jz4740_nand.o
 obj-$(CONFIG_MTD_NAND_GPMI_NAND)	+= gpmi-nand/
+obj-$(CONFIG_MTD_NAND_BCM47XX)		+= bcm47xx_nand.o
 
 nand-objs := nand_base.o nand_bbt.o
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -376,6 +376,7 @@ struct bcma_chipcommon_pmu {
 enum bcma_flash_type {
 	BCMA_PFLASH,
 	BCMA_SFLASH,
+	BCMA_NFLASH,
 };
 
 struct bcma_pflash {
@@ -392,6 +393,14 @@ struct bcma_sflash {
 };
 #endif /* CONFIG_BCMA_SFLASH */
 
+#ifdef CONFIG_BCMA_NFLASH
+struct bcma_nflash {
+	u32 blocksize;		/* Block size */
+	u32 pagesize;		/* Page size */
+	u32 size;		/* Total size in bytes */
+};
+#endif
+
 struct bcma_serial_port {
 	void *regs;
 	unsigned long clockspeed;
@@ -417,6 +426,9 @@ struct bcma_drv_cc {
 #ifdef CONFIG_BCMA_SFLASH
 		struct bcma_sflash sflash;
 #endif /* CONFIG_BCMA_SFLASH */
+#ifdef CONFIG_BCMA_NFLASH
+		struct bcma_nflash nflash;
+#endif
 	};
 
 	int nr_serial_ports;
@@ -483,4 +495,13 @@ int bcma_sflash_commit(struct bcma_drv_c
 			     const u8 *buf);
 #endif /* CONFIG_BCMA_SFLASH */
 
+#ifdef CONFIG_BCMA_NFLASH
+/* Chipcommon nflash support. */
+int bcma_nflash_read(struct bcma_drv_cc *cc, u32 offset, u32 len, u8 *buf);
+int bcma_nflash_poll(struct bcma_drv_cc *cc);
+int bcma_nflash_write(struct bcma_drv_cc *cc, u32 offset, u32 len, const u8 *buf);
+int bcma_nflash_erase(struct bcma_drv_cc *cc, u32 offset);
+int bcma_nflash_commit(struct bcma_drv_cc *cc, u32 offset, u32 len, const u8 *buf);
+#endif
+
 #endif /* LINUX_BCMA_DRIVER_CC_H_ */
--- /dev/null
+++ b/include/linux/mtd/bcm47xx_nand.h
@@ -0,0 +1,134 @@
+/*
+ * Broadcom chipcommon NAND flash interface
+ *
+ * Copyright (C) 2011-2012 Tathagata Das <tathagata@alumnux.com>
+ * Copyright (C) 2009, Broadcom Corporation
+ * All Rights Reserved.
+ * 
+ * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
+ * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
+ * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
+ *
+ */
+
+#ifndef _nflash_h_
+#define _nflash_h_
+
+#define  NAND_FLASH1						0x1fc00000  /* MIPS Flash Region 1 */
+
+/* nand_cmd_start commands */
+#define	NCMD_NULL						0
+#define	NCMD_PAGE_RD					1
+#define	NCMD_SPARE_RD					2
+#define	NCMD_STATUS_RD					3
+#define	NCMD_PAGE_PROG					4
+#define	NCMD_SPARE_PROG				5
+#define	NCMD_COPY_BACK					6
+#define	NCMD_ID_RD						7
+#define	NCMD_BLOCK_ERASE				8
+#define	NCMD_FLASH_RESET				9
+#define	NCMD_LOCK						0xa
+#define	NCMD_LOCK_DOWN					0xb
+#define	NCMD_UNLOCK						0xc
+#define	NCMD_LOCK_STATUS				0xd
+
+/* nand_acc_control */
+#define	NAC_RD_ECC_EN					0x80000000
+#define	NAC_WR_ECC_EN					0x40000000
+#define	NAC_RD_ECC_BLK0_EN			0x20000000
+#define	NAC_FAST_PGM_RDIN				0x10000000
+#define	NAC_RD_ERASED_ECC_EN			0x08000000
+#define	NAC_PARTIAL_PAGE_EN			0x04000000
+#define	NAC_PAGE_HIT_EN				0x01000000
+#define	NAC_ECC_LEVEL0					0x00f00000
+#define	NAC_ECC_LEVEL					0x000f0000
+#define	NAC_SPARE_SIZE0				0x00003f00
+#define	NAC_SPARE_SIZE					0x0000003f
+
+/* nand_config */
+#define	NCF_CONFIG_LOCK				0x80000000
+#define	NCF_BLOCK_SIZE_MASK			0x70000000
+#define	NCF_BLOCK_SIZE_SHIFT			28
+#define	NCF_DEVICE_SIZE_MASK			0x0f000000
+#define	NCF_DEVICE_SIZE_SHIFT		24
+#define	NCF_DEVICE_WIDTH				0x00800000
+#define	NCF_PAGE_SIZE_MASK			0x00300000
+#define	NCF_PAGE_SIZE_SHIFT			20
+#define	NCF_FULL_ADDR_BYTES_MASK	0x00070000
+#define	NCF_FULL_ADDR_BYTES_SHIFT	16
+#define	NCF_COL_ADDR_BYTES_MASK		0x00007000
+#define	NCF_COL_ADDR_BYTES_SHIFT	12
+#define	NCF_BLK_ADDR_BYTES_MASK		0x00000700
+#define	NCF_BLK_ADDR_BYTES_SHIFT	8
+
+/* nand_intfc_status */
+#define	NIST_CTRL_READY				0x80000000
+#define	NIST_FLASH_READY				0x40000000
+#define	NIST_CACHE_VALID				0x20000000
+#define	NIST_SPARE_VALID				0x10000000
+#define	NIST_ERASED						0x08000000
+#define	NIST_STATUS						0x000000ff
+
+#define	NFL_SECTOR_SIZE				512
+
+#define	NFL_TABLE_END					0xffffffff
+#define	NFL_BOOT_SIZE					0x200000
+#define	NFL_BOOT_OS_SIZE				0x2000000
+
+/* Nand flash MLC controller registers (corerev >= 38) */
+#define	NAND_REVISION					0xC00
+#define	NAND_CMD_START					0xC04
+#define	NAND_CMD_ADDR_X				0xC08
+#define	NAND_CMD_ADDR					0xC0C
+#define	NAND_CMD_END_ADDR				0xC10
+#define	NAND_CS_NAND_SELECT			0xC14
+#define	NAND_CS_NAND_XOR				0xC18
+#define	NAND_SPARE_RD0					0xC20
+#define	NAND_SPARE_RD4					0xC24
+#define	NAND_SPARE_RD8					0xC28
+#define	NAND_SPARE_RD12				0xC2C
+#define	NAND_SPARE_WR0					0xC30
+#define	NAND_SPARE_WR4					0xC34
+#define	NAND_SPARE_WR8					0xC38
+#define	NAND_SPARE_WR12				0xC3C
+#define	NAND_ACC_CONTROL				0xC40
+#define	NAND_CONFIG						0xC48
+#define	NAND_TIMING_1					0xC50
+#define	NAND_TIMING_2					0xC54
+#define	NAND_SEMAPHORE					0xC58
+#define	NAND_DEVID						0xC60
+#define	NAND_DEVID_X					0xC64
+#define	NAND_BLOCK_LOCK_STATUS		0xC68
+#define	NAND_INTFC_STATUS				0xC6C
+#define	NAND_ECC_CORR_ADDR_X			0xC70
+#define	NAND_ECC_CORR_ADDR			0xC74
+#define	NAND_ECC_UNC_ADDR_X			0xC78
+#define	NAND_ECC_UNC_ADDR				0xC7C
+#define	NAND_READ_ERROR_COUNT		0xC80
+#define	NAND_CORR_STAT_THRESHOLD	0xC84
+#define	NAND_READ_ADDR_X				0xC90
+#define	NAND_READ_ADDR					0xC94
+#define	NAND_PAGE_PROGRAM_ADDR_X	0xC98
+#define	NAND_PAGE_PROGRAM_ADDR		0xC9C
+#define	NAND_COPY_BACK_ADDR_X		0xCA0
+#define	NAND_COPY_BACK_ADDR			0xCA4
+#define	NAND_BLOCK_ERASE_ADDR_X		0xCA8
+#define	NAND_BLOCK_ERASE_ADDR		0xCAC
+#define	NAND_INV_READ_ADDR_X			0xCB0
+#define	NAND_INV_READ_ADDR			0xCB4
+#define	NAND_BLK_WR_PROTECT			0xCC0
+#define	NAND_ACC_CONTROL_CS1			0xCD0
+#define	NAND_CONFIG_CS1				0xCD4
+#define	NAND_TIMING_1_CS1				0xCD8
+#define	NAND_TIMING_2_CS1				0xCDC
+#define	NAND_SPARE_RD16				0xD30
+#define	NAND_SPARE_RD20				0xD34
+#define	NAND_SPARE_RD24				0xD38
+#define	NAND_SPARE_RD28				0xD3C
+#define	NAND_CACHE_ADDR				0xD40
+#define	NAND_CACHE_DATA				0xD44
+#define	NAND_CTRL_CONFIG				0xD48
+#define	NAND_CTRL_STATUS				0xD4C
+
+#endif /* _nflash_h_ */