--- /dev/null
+--- 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_ */
projects / openwrt / svn-archive / archive.git / commitdiff