[MTD] Add initial support for OneNAND flash chips
OneNAND is a new flash technology from Samsung with integrated SRAM
buffers and logic interface.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 843a1cb..3dbfbaf 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -1,4 +1,4 @@
-# $Id: Kconfig,v 1.9 2005/06/16 08:49:29 sean Exp $
+# $Id: Kconfig,v 1.10 2005/07/11 10:39:27 gleixner Exp $
menu "Memory Technology Devices (MTD)"
@@ -259,9 +259,9 @@
---help---
This provides support for the flash translation layer known
as the Resident Flash Disk (RFD), as used by the Embedded BIOS
- of General Software.
- See http://www.gensw.com/pages/prod/bios/rfd.htm for further
- information.
+ of General Software. There is a blurb at:
+
+ http://www.gensw.com/pages/prod/bios/rfd.htm
source "drivers/mtd/chips/Kconfig"
@@ -271,5 +271,7 @@
source "drivers/mtd/nand/Kconfig"
+source "drivers/mtd/onenand/Kconfig"
+
endmenu
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index cb16b7d..fc93744 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -1,7 +1,7 @@
#
# Makefile for the memory technology device drivers.
#
-# $Id: Makefile.common,v 1.6 2005/06/16 08:49:29 sean Exp $
+# $Id: Makefile.common,v 1.7 2005/07/11 10:39:27 gleixner Exp $
# Core functionality.
mtd-y := mtdcore.o
@@ -25,4 +25,4 @@
nftl-objs := nftlcore.o nftlmount.o
inftl-objs := inftlcore.o inftlmount.o
-obj-y += chips/ maps/ devices/ nand/
+obj-y += chips/ maps/ devices/ nand/ onenand/
diff --git a/drivers/mtd/onenand/Kconfig b/drivers/mtd/onenand/Kconfig
new file mode 100644
index 0000000..7d76ede
--- /dev/null
+++ b/drivers/mtd/onenand/Kconfig
@@ -0,0 +1,32 @@
+#
+# linux/drivers/mtd/onenand/Kconfig
+#
+
+menu "OneNAND Flash Device Drivers (EXPERIMENTAL)"
+ depends on MTD != n && EXPERIMENTAL
+
+config MTD_ONENAND
+ tristate "OneNAND Device Support"
+ depends on MTD
+ help
+ This enables support for accessing all type of OneNAND flash
+ devices. For further information see
+ <http://www.samsung.com/Products/Semiconductor/Flash/OneNAND_TM/index.htm>.
+
+config MTD_ONENAND_VERIFY_WRITE
+ bool "Verify OneNAND page writes"
+ depends on MTD_ONENAND
+ help
+ This adds an extra check when data is written to the flash. The
+ OneNAND flash device internally checks only bits transitioning
+ from 1 to 0. There is a rare possibility that even though the
+ device thinks the write was successful, a bit could have been
+ flipped accidentaly due to device wear or something else.
+
+config MTD_ONENAND_OMAP
+ tristate "OneNAND Flash device on OMAP board"
+ depends on ARCH_OMAP && MTD_ONENAND
+ help
+ Support for OneNAND flash on TI OMAP board.
+
+endmenu
diff --git a/drivers/mtd/onenand/Makefile b/drivers/mtd/onenand/Makefile
new file mode 100644
index 0000000..f4e7586
--- /dev/null
+++ b/drivers/mtd/onenand/Makefile
@@ -0,0 +1,9 @@
+#
+# Makefile for the OneNAND MTD
+#
+
+# Core functionality.
+obj-$(CONFIG_MTD_ONENAND) += onenand_base.o
+
+# Board specific.
+obj-$(CONFIG_MTD_ONENAND_OMAP) += omap-onenand.o
diff --git a/drivers/mtd/onenand/omap-onenand.c b/drivers/mtd/onenand/omap-onenand.c
new file mode 100644
index 0000000..56e1aec
--- /dev/null
+++ b/drivers/mtd/onenand/omap-onenand.c
@@ -0,0 +1,178 @@
+/*
+ * linux/drivers/mtd/onenand/omap-onenand.c
+ *
+ * Copyright (c) 2005 Samsung Electronics
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * Derived from linux/drivers/mtd/nand/omap-nand-flash.c
+ *
+ * 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.
+ *
+ * Overview:
+ * This is a device driver for the OneNAND flash device for TI OMAP boards.
+ */
+
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/tc.h>
+#include <asm/sizes.h>
+
+#define OMAP_ONENAND_FLASH_START1 OMAP_CS2A_PHYS
+#define OMAP_ONENAND_FLASH_START2 OMAP_CS0_PHYS
+/*
+ * MTD structure for OMAP board
+ */
+static struct mtd_info *omap_onenand_mtd = NULL;
+
+/*
+ * Define partitions for flash devices
+ */
+
+#ifdef CONFIG_MTD_PARTITIONS
+static struct mtd_partition static_partition[] = {
+ {
+ .name = "X-Loader + U-Boot",
+ .offset = 0,
+ .size = SZ_128K,
+ .mask_flags = MTD_WRITEABLE /* force read-only */
+ },
+ {
+ .name = "U-Boot Environment",
+ .offset = MTDPART_OFS_APPEND,
+ .size = SZ_128K,
+ .mask_flags = MTD_WRITEABLE /* force read-only */
+ },
+ {
+ .name = "kernel",
+ .offset = MTDPART_OFS_APPEND,
+ .size = 2 * SZ_1M
+ },
+ {
+ .name = "filesystem0",
+ .offset = MTDPART_OFS_APPEND,
+ .size = SZ_16M,
+ },
+ {
+ .name = "filesystem1",
+ .offset = MTDPART_OFS_APPEND,
+ .size = MTDPART_SIZ_FULL,
+ },
+};
+
+const char *part_probes[] = { "cmdlinepart", NULL, };
+
+#endif
+
+/* Scan to find existance of the device at base.
+ This also allocates oob and data internal buffers */
+static char onenand_name[] = "onenand";
+
+/*
+ * Main initialization routine
+ */
+static int __init omap_onenand_init (void)
+{
+ struct onenand_chip *this;
+ struct mtd_partition *dynamic_partition = 0;
+ int err = 0;
+
+ /* Allocate memory for MTD device structure and private data */
+ omap_onenand_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct onenand_chip),
+ GFP_KERNEL);
+ if (!omap_onenand_mtd) {
+ printk (KERN_WARNING "Unable to allocate OneNAND MTD device structure.\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* Get pointer to private data */
+ this = (struct onenand_chip *) (&omap_onenand_mtd[1]);
+
+ /* Initialize structures */
+ memset((char *) omap_onenand_mtd, 0, sizeof(struct mtd_info) + sizeof(struct onenand_chip));
+
+ /* Link the private data with the MTD structure */
+ omap_onenand_mtd->priv = this;
+
+ /* try the first address */
+ this->base = ioremap(OMAP_ONENAND_FLASH_START1, SZ_128K);
+ omap_onenand_mtd->name = onenand_name;
+ if (onenand_scan(omap_onenand_mtd, 1)){
+ /* try the second address */
+ iounmap(this->base);
+ this->base = ioremap(OMAP_ONENAND_FLASH_START2, SZ_128K);
+ if (onenand_scan(omap_onenand_mtd, 1)) {
+ iounmap(this->base);
+ err = -ENXIO;
+ goto out_mtd;
+ }
+ }
+
+ /* Register the partitions */
+ switch (omap_onenand_mtd->size) {
+ case SZ_128M:
+ case SZ_64M:
+ case SZ_32M:
+#ifdef CONFIG_MTD_PARTITIONS
+ err = parse_mtd_partitions(omap_onenand_mtd, part_probes,
+ &dynamic_partition, 0);
+ if (err > 0)
+ err = add_mtd_partitions(omap_onenand_mtd,
+ dynamic_partition, err);
+ else if (1)
+ err = add_mtd_partitions(omap_onenand_mtd,
+ static_partition,
+ ARRAY_SIZE(static_partition));
+ else
+#endif
+ err = add_mtd_device(omap_onenand_mtd);
+ if (err)
+ goto out_buf;
+ break;
+
+ default:
+ printk(KERN_WARNING "Unsupported OneNAND device\n");
+ err = -ENXIO;
+ goto out_buf;
+ }
+
+ return 0;
+
+out_buf:
+ onenand_release(omap_onenand_mtd);
+ iounmap(this->base);
+out_mtd:
+ kfree(omap_onenand_mtd);
+out:
+ return err;
+}
+
+/*
+ * Clean up routine
+ */
+static void __exit omap_onenand_cleanup (void)
+{
+ struct onenand_chip *this = omap_onenand_mtd->priv;
+
+ /* onenand_release frees MTD partitions, MTD structure
+ and onenand internal buffers */
+ onenand_release(omap_onenand_mtd);
+ iounmap(this->base);
+ kfree(omap_onenand_mtd);
+}
+
+module_init(omap_onenand_init);
+module_exit(omap_onenand_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP boards");
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
new file mode 100644
index 0000000..bcce22a
--- /dev/null
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -0,0 +1,1462 @@
+/*
+ * linux/drivers/mtd/onenand/onenand_base.c
+ *
+ * Copyright (C) 2005 Samsung Electronics
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+
+/**
+ * onenand_oob_64 - oob info for large (2KB) page
+ */
+static struct nand_oobinfo onenand_oob_64 = {
+ .useecc = MTD_NANDECC_AUTOPLACE,
+ .eccbytes = 20,
+ .eccpos = {
+ 8, 9, 10, 11, 12,
+ 24, 25, 26, 27, 28,
+ 40, 41, 42, 43, 44,
+ 56, 57, 58, 59, 60,
+ },
+ .oobfree = {
+ {2, 3}, {14, 2}, {18, 3}, {30, 2},
+ {24, 3}, {46, 2}, {40, 3}, {62, 2} }
+};
+
+/**
+ * onenand_oob_32 - oob info for middle (1KB) page
+ */
+static struct nand_oobinfo onenand_oob_32 = {
+ .useecc = MTD_NANDECC_AUTOPLACE,
+ .eccbytes = 10,
+ .eccpos = {
+ 8, 9, 10, 11, 12,
+ 24, 25, 26, 27, 28,
+ },
+ .oobfree = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
+};
+
+static const unsigned char ffchars[] = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
+};
+
+/**
+ * onenand_readw - [OneNAND Interface] Read OneNAND register
+ * @param addr address to read
+ *
+ * Read OneNAND register
+ */
+static unsigned short onenand_readw(void __iomem *addr)
+{
+ return readw(addr);
+}
+
+/**
+ * onenand_writew - [OneNAND Interface] Write OneNAND register with value
+ * @param value value to write
+ * @param addr address to write
+ *
+ * Write OneNAND register with value
+ */
+static void onenand_writew(unsigned short value, void __iomem *addr)
+{
+ writew(value, addr);
+}
+
+/**
+ * onenand_block_address - [DEFAULT] Get block address
+ * @param device the device id
+ * @param block the block
+ * @return translated block address if DDP, otherwise same
+ *
+ * Setup Start Address 1 Register (F100h)
+ */
+static int onenand_block_address(int device, int block)
+{
+ if (device & ONENAND_DEVICE_IS_DDP) {
+ /* Device Flash Core select, NAND Flash Block Address */
+ int dfs = 0, density, mask;
+
+ density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
+ mask = (1 << (density + 6));
+
+ if (block & mask)
+ dfs = 1;
+
+ return (dfs << ONENAND_DDP_SHIFT) | (block & (mask - 1));
+ }
+
+ return block;
+}
+
+/**
+ * onenand_bufferram_address - [DEFAULT] Get bufferram address
+ * @param device the device id
+ * @param block the block
+ * @return set DBS value if DDP, otherwise 0
+ *
+ * Setup Start Address 2 Register (F101h) for DDP
+ */
+static int onenand_bufferram_address(int device, int block)
+{
+ if (device & ONENAND_DEVICE_IS_DDP) {
+ /* Device BufferRAM Select */
+ int dbs = 0, density, mask;
+
+ density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
+ mask = (1 << (density + 6));
+
+ if (block & mask)
+ dbs = 1;
+
+ return (dbs << ONENAND_DDP_SHIFT);
+ }
+
+ return 0;
+}
+
+/**
+ * onenand_page_address - [DEFAULT] Get page address
+ * @param page the page address
+ * @param sector the sector address
+ * @return combined page and sector address
+ *
+ * Setup Start Address 8 Register (F107h)
+ */
+static int onenand_page_address(int page, int sector)
+{
+ /* Flash Page Address, Flash Sector Address */
+ int fpa, fsa;
+
+ fpa = page & ONENAND_FPA_MASK;
+ fsa = sector & ONENAND_FSA_MASK;
+
+ return ((fpa << ONENAND_FPA_SHIFT) | fsa);
+}
+
+/**
+ * onenand_buffer_address - [DEFAULT] Get buffer address
+ * @param dataram1 DataRAM index
+ * @param sectors the sector address
+ * @param count the number of sectors
+ * @return the start buffer value
+ *
+ * Setup Start Buffer Register (F200h)
+ */
+static int onenand_buffer_address(int dataram1, int sectors, int count)
+{
+ int bsa, bsc;
+
+ /* BufferRAM Sector Address */
+ bsa = sectors & ONENAND_BSA_MASK;
+
+ if (dataram1)
+ bsa |= ONENAND_BSA_DATARAM1; /* DataRAM1 */
+ else
+ bsa |= ONENAND_BSA_DATARAM0; /* DataRAM0 */
+
+ /* BufferRAM Sector Count */
+ bsc = count & ONENAND_BSC_MASK;
+
+ return ((bsa << ONENAND_BSA_SHIFT) | bsc);
+}
+
+/**
+ * onenand_command - [DEFAULT] Send command to OneNAND device
+ * @param mtd MTD device structure
+ * @param cmd the command to be sent
+ * @param addr offset to read from or write to
+ * @param len number of bytes to read or write
+ *
+ * Send command to OneNAND device. This function is used for middle/large page
+ * devices (1KB/2KB Bytes per page)
+ */
+static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
+{
+ struct onenand_chip *this = mtd->priv;
+ int value, readcmd = 0;
+ int block, page;
+ /* Now we use page size operation */
+ int sectors = 4, count = 4;
+
+ /* Address translation */
+ switch (cmd) {
+ case ONENAND_CMD_UNLOCK:
+ case ONENAND_CMD_LOCK:
+ case ONENAND_CMD_LOCK_TIGHT:
+ block = -1;
+ page = -1;
+ break;
+
+ case ONENAND_CMD_ERASE:
+ case ONENAND_CMD_BUFFERRAM:
+ block = (int) (addr >> this->erase_shift);
+ page = -1;
+ break;
+
+ default:
+ block = (int) (addr >> this->erase_shift);
+ page = (int) (addr >> this->page_shift);
+ page &= this->page_mask;
+ break;
+ }
+
+ /* NOTE: The setting order of the registers is very important! */
+ if (cmd == ONENAND_CMD_BUFFERRAM) {
+ /* Select DataRAM for DDP */
+ value = onenand_bufferram_address(this->device_id, block);
+ this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
+
+ /* Switch to the next data buffer */
+ ONENAND_SET_NEXT_BUFFERRAM(this);
+
+ return 0;
+ }
+
+ if (block != -1) {
+ /* Write 'DFS, FBA' of Flash */
+ value = onenand_block_address(this->device_id, block);
+ this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
+ }
+
+ if (page != -1) {
+ int dataram;
+
+ switch (cmd) {
+ case ONENAND_CMD_READ:
+ case ONENAND_CMD_READOOB:
+ dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
+ readcmd = 1;
+ break;
+
+ default:
+ dataram = ONENAND_CURRENT_BUFFERRAM(this);
+ break;
+ }
+
+ /* Write 'FPA, FSA' of Flash */
+ value = onenand_page_address(page, sectors);
+ this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
+
+ /* Write 'BSA, BSC' of DataRAM */
+ value = onenand_buffer_address(dataram, sectors, count);
+ this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
+
+ if (readcmd) {
+ /* Select DataRAM for DDP */
+ value = onenand_bufferram_address(this->device_id, block);
+ this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
+ }
+ }
+
+ /* Interrupt clear */
+ this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
+
+ /* Write command */
+ this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
+
+ return 0;
+}
+
+/**
+ * onenand_wait - [DEFAULT] wait until the command is done
+ * @param mtd MTD device structure
+ * @param state state to select the max. timeout value
+ *
+ * Wait for command done. This applies to all OneNAND command
+ * Read can take up to 30us, erase up to 2ms and program up to 350us
+ * according to general OneNAND specs
+ */
+static int onenand_wait(struct mtd_info *mtd, int state)
+{
+ struct onenand_chip * this = mtd->priv;
+ unsigned long timeout;
+ unsigned int flags = ONENAND_INT_MASTER;
+ unsigned int interrupt = 0;
+ unsigned int ctrl, ecc;
+
+ /* The 20 msec is enough */
+ timeout = jiffies + msecs_to_jiffies(20);
+ while (time_before(jiffies, timeout)) {
+ interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
+
+ if (interrupt & flags)
+ break;
+
+ if (state != FL_READING)
+ cond_resched();
+ }
+ /* To get correct interrupt status in timeout case */
+ interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
+
+ ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
+
+ if (ctrl & ONENAND_CTRL_ERROR) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x", ctrl);
+ return -EIO;
+ }
+
+ if (ctrl & ONENAND_CTRL_LOCK) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x", ctrl);
+ return -EIO;
+ }
+
+ if (interrupt & ONENAND_INT_READ) {
+ ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
+ if (ecc & ONENAND_ECC_2BIT_ALL) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x", ecc);
+ return -EBADMSG;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
+ * @param mtd MTD data structure
+ * @param area BufferRAM area
+ * @return offset given area
+ *
+ * Return BufferRAM offset given area
+ */
+static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
+{
+ struct onenand_chip *this = mtd->priv;
+
+ if (ONENAND_CURRENT_BUFFERRAM(this)) {
+ if (area == ONENAND_DATARAM)
+ return mtd->oobblock;
+ if (area == ONENAND_SPARERAM)
+ return mtd->oobsize;
+ }
+
+ return 0;
+}
+
+/**
+ * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
+ * @param mtd MTD data structure
+ * @param area BufferRAM area
+ * @param buffer the databuffer to put/get data
+ * @param offset offset to read from or write to
+ * @param count number of bytes to read/write
+ *
+ * Read the BufferRAM area
+ */
+static int onenand_read_bufferram(struct mtd_info *mtd, int area,
+ unsigned char *buffer, int offset, size_t count)
+{
+ struct onenand_chip *this = mtd->priv;
+ void __iomem *bufferram;
+
+ bufferram = this->base + area;
+
+ bufferram += onenand_bufferram_offset(mtd, area);
+
+ memcpy(buffer, bufferram + offset, count);
+
+ return 0;
+}
+
+/**
+ * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
+ * @param mtd MTD data structure
+ * @param area BufferRAM area
+ * @param buffer the databuffer to put/get data
+ * @param offset offset to read from or write to
+ * @param count number of bytes to read/write
+ *
+ * Write the BufferRAM area
+ */
+static int onenand_write_bufferram(struct mtd_info *mtd, int area,
+ const unsigned char *buffer, int offset, size_t count)
+{
+ struct onenand_chip *this = mtd->priv;
+ void __iomem *bufferram;
+
+ bufferram = this->base + area;
+
+ bufferram += onenand_bufferram_offset(mtd, area);
+
+ memcpy(bufferram + offset, buffer, count);
+
+ return 0;
+}
+
+/**
+ * onenand_check_bufferram - [GENERIC] Check BufferRAM information
+ * @param mtd MTD data structure
+ * @param addr address to check
+ * @return 1 if there are valid data, otherwise 0
+ *
+ * Check bufferram if there is data we required
+ */
+static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
+{
+ struct onenand_chip *this = mtd->priv;
+ int block, page;
+ int i;
+
+ block = (int) (addr >> this->erase_shift);
+ page = (int) (addr >> this->page_shift);
+ page &= this->page_mask;
+
+ i = ONENAND_CURRENT_BUFFERRAM(this);
+
+ /* Is there valid data? */
+ if (this->bufferram[i].block == block &&
+ this->bufferram[i].page == page &&
+ this->bufferram[i].valid)
+ return 1;
+
+ return 0;
+}
+
+/**
+ * onenand_update_bufferram - [GENERIC] Update BufferRAM information
+ * @param mtd MTD data structure
+ * @param addr address to update
+ * @param valid valid flag
+ *
+ * Update BufferRAM information
+ */
+static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
+ int valid)
+{
+ struct onenand_chip *this = mtd->priv;
+ int block, page;
+ int i;
+
+ block = (int) (addr >> this->erase_shift);
+ page = (int) (addr >> this->page_shift);
+ page &= this->page_mask;
+
+ /* Invalidate BufferRAM */
+ for (i = 0; i < MAX_BUFFERRAM; i++) {
+ if (this->bufferram[i].block == block &&
+ this->bufferram[i].page == page)
+ this->bufferram[i].valid = 0;
+ }
+
+ /* Update BufferRAM */
+ i = ONENAND_CURRENT_BUFFERRAM(this);
+ this->bufferram[i].block = block;
+ this->bufferram[i].page = page;
+ this->bufferram[i].valid = valid;
+
+ return 0;
+}
+
+/**
+ * onenand_get_device - [GENERIC] Get chip for selected access
+ * @param mtd MTD device structure
+ * @param new_state the state which is requested
+ *
+ * Get the device and lock it for exclusive access
+ */
+static void onenand_get_device(struct mtd_info *mtd, int new_state)
+{
+ struct onenand_chip *this = mtd->priv;
+ DECLARE_WAITQUEUE(wait, current);
+
+ /*
+ * Grab the lock and see if the device is available
+ */
+ while (1) {
+ spin_lock(&this->chip_lock);
+ if (this->state == FL_READY) {
+ this->state = new_state;
+ spin_unlock(&this->chip_lock);
+ break;
+ }
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&this->wq, &wait);
+ spin_unlock(&this->chip_lock);
+ schedule();
+ remove_wait_queue(&this->wq, &wait);
+ }
+}
+
+/**
+ * onenand_release_device - [GENERIC] release chip
+ * @param mtd MTD device structure
+ *
+ * Deselect, release chip lock and wake up anyone waiting on the device
+ */
+static void onenand_release_device(struct mtd_info *mtd)
+{
+ struct onenand_chip *this = mtd->priv;
+
+ /* Release the chip */
+ spin_lock(&this->chip_lock);
+ this->state = FL_READY;
+ wake_up(&this->wq);
+ spin_unlock(&this->chip_lock);
+}
+
+/**
+ * onenand_read_ecc - [MTD Interface] Read data with ECC
+ * @param mtd MTD device structure
+ * @param from offset to read from
+ * @param len number of bytes to read
+ * @param retlen pointer to variable to store the number of read bytes
+ * @param buf the databuffer to put data
+ * @param oob_buf filesystem supplied oob data buffer
+ * @param oobsel oob selection structure
+ *
+ * OneNAND read with ECC
+ */
+static int onenand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf,
+ u_char *oob_buf, struct nand_oobinfo *oobsel)
+{
+ struct onenand_chip *this = mtd->priv;
+ int read = 0, column;
+ int thislen;
+ int ret = 0;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
+
+ /* Do not allow reads past end of device */
+ if ((from + len) > mtd->size) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: Attempt read beyond end of device\n");
+ *retlen = 0;
+ return -EINVAL;
+ }
+
+ /* Grab the lock and see if the device is available */
+ onenand_get_device(mtd, FL_READING);
+
+ /* TODO handling oob */
+
+ while (read < len) {
+ thislen = min_t(int, mtd->oobblock, len - read);
+
+ column = from & (mtd->oobblock - 1);
+ if (column + thislen > mtd->oobblock)
+ thislen = mtd->oobblock - column;
+
+ if (!onenand_check_bufferram(mtd, from)) {
+ this->command(mtd, ONENAND_CMD_READ, from, mtd->oobblock);
+
+ ret = this->wait(mtd, FL_READING);
+ /* First copy data and check return value for ECC handling */
+ onenand_update_bufferram(mtd, from, 1);
+ }
+
+ this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
+
+ read += thislen;
+
+ if (read == len)
+ break;
+
+ if (ret) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: read failed = %d\n", ret);
+ goto out;
+ }
+
+ from += thislen;
+ buf += thislen;
+ }
+
+out:
+ /* Deselect and wake up anyone waiting on the device */
+ onenand_release_device(mtd);
+
+ /*
+ * Return success, if no ECC failures, else -EBADMSG
+ * fs driver will take care of that, because
+ * retlen == desired len and result == -EBADMSG
+ */
+ *retlen = read;
+ return ret;
+}
+
+/**
+ * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
+ * @param mtd MTD device structure
+ * @param from offset to read from
+ * @param len number of bytes to read
+ * @param retlen pointer to variable to store the number of read bytes
+ * @param buf the databuffer to put data
+ *
+ * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
+*/
+static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ return onenand_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
+}
+
+/**
+ * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
+ * @param mtd MTD device structure
+ * @param from offset to read from
+ * @param len number of bytes to read
+ * @param retlen pointer to variable to store the number of read bytes
+ * @param buf the databuffer to put data
+ *
+ * OneNAND read out-of-band data from the spare area
+ */
+static int onenand_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct onenand_chip *this = mtd->priv;
+ int read = 0, thislen, column;
+ int ret = 0;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
+
+ /* Initialize return length value */
+ *retlen = 0;
+
+ /* Do not allow reads past end of device */
+ if (unlikely((from + len) > mtd->size)) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: Attempt read beyond end of device\n");
+ return -EINVAL;
+ }
+
+ /* Grab the lock and see if the device is available */
+ onenand_get_device(mtd, FL_READING);
+
+ column = from & (mtd->oobsize - 1);
+
+ while (read < len) {
+ thislen = mtd->oobsize - column;
+ thislen = min_t(int, thislen, len);
+
+ this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
+
+ onenand_update_bufferram(mtd, from, 0);
+
+ ret = this->wait(mtd, FL_READING);
+ /* First copy data and check return value for ECC handling */
+
+ this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
+
+ read += thislen;
+
+ if (read == len)
+ break;
+
+ if (ret) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret);
+ goto out;
+ }
+
+ buf += thislen;
+
+ /* Read more? */
+ if (read < len) {
+ /* Page size */
+ from += mtd->oobblock;
+ column = 0;
+ }
+ }
+
+out:
+ /* Deselect and wake up anyone waiting on the device */
+ onenand_release_device(mtd);
+
+ *retlen = read;
+ return ret;
+}
+
+#ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
+/**
+ * onenand_verify_page - [GENERIC] verify the chip contents after a write
+ * @param mtd MTD device structure
+ * @param buf the databuffer to verify
+ * @param block block address
+ * @param page page address
+ *
+ * Check DataRAM area directly
+ */
+static int onenand_verify_page(struct mtd_info *mtd, u_char *buf,
+ loff_t addr, int block, int page)
+{
+ struct onenand_chip *this = mtd->priv;
+ void __iomem *dataram0, *dataram1;
+ int ret = 0;
+
+ this->command(mtd, ONENAND_CMD_READ, addr, mtd->oobblock);
+
+ ret = this->wait(mtd, FL_READING);
+ if (ret)
+ return ret;
+
+ onenand_update_bufferram(mtd, addr, 1);
+
+ /* Check, if the two dataram areas are same */
+ dataram0 = this->base + ONENAND_DATARAM;
+ dataram1 = dataram0 + mtd->oobblock;
+
+ if (memcmp(dataram0, dataram1, mtd->oobblock))
+ return -EBADMSG;
+
+ return 0;
+}
+#else
+#define onenand_verify_page(...) (0)
+#endif
+
+#define NOTALIGNED(x) ((x & (mtd->oobblock - 1)) != 0)
+
+/**
+ * onenand_write_ecc - [MTD Interface] OneNAND write with ECC
+ * @param mtd MTD device structure
+ * @param to offset to write to
+ * @param len number of bytes to write
+ * @param retlen pointer to variable to store the number of written bytes
+ * @param buf the data to write
+ * @param eccbuf filesystem supplied oob data buffer
+ * @param oobsel oob selection structure
+ *
+ * OneNAND write with ECC
+ */
+static int onenand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf,
+ u_char *eccbuf, struct nand_oobinfo *oobsel)
+{
+ struct onenand_chip *this = mtd->priv;
+ int written = 0;
+ int ret = 0;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
+
+ /* Initialize retlen, in case of early exit */
+ *retlen = 0;
+
+ /* Do not allow writes past end of device */
+ if (unlikely((to + len) > mtd->size)) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt write to past end of device\n");
+ return -EINVAL;
+ }
+
+ /* Reject writes, which are not page aligned */
+ if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt to write not page aligned data\n");
+ return -EINVAL;
+ }
+
+ /* Grab the lock and see if the device is available */
+ onenand_get_device(mtd, FL_WRITING);
+
+ /* Loop until all data write */
+ while (written < len) {
+ int thislen = min_t(int, mtd->oobblock, len - written);
+
+ this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
+
+ this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
+ this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
+
+ this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
+
+ onenand_update_bufferram(mtd, to, 1);
+
+ ret = this->wait(mtd, FL_WRITING);
+ if (ret) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: write filaed %d\n", ret);
+ goto out;
+ }
+
+ written += thislen;
+
+ /* Only check verify write turn on */
+ ret = onenand_verify_page(mtd, (u_char *) buf, to, block, page);
+ if (ret) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: verify failed %d\n", ret);
+ goto out;
+ }
+
+ if (written == len)
+ break;
+
+ to += thislen;
+ buf += thislen;
+ }
+
+out:
+ /* Deselect and wake up anyone waiting on the device */
+ onenand_release_device(mtd);
+
+ *retlen = written;
+
+ return ret;
+}
+
+/**
+ * onenand_write - [MTD Interface] compability function for onenand_write_ecc
+ * @param mtd MTD device structure
+ * @param to offset to write to
+ * @param len number of bytes to write
+ * @param retlen pointer to variable to store the number of written bytes
+ * @param buf the data to write
+ *
+ * This function simply calls onenand_write_ecc
+ * with oob buffer and oobsel = NULL
+ */
+static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ return onenand_write_ecc(mtd, to, len, retlen, buf, NULL, NULL);
+}
+
+/**
+ * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
+ * @param mtd MTD device structure
+ * @param to offset to write to
+ * @param len number of bytes to write
+ * @param retlen pointer to variable to store the number of written bytes
+ * @param buf the data to write
+ *
+ * OneNAND write out-of-band
+ */
+static int onenand_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct onenand_chip *this = mtd->priv;
+ int column, status;
+ int written = 0;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
+
+ /* Initialize retlen, in case of early exit */
+ *retlen = 0;
+
+ /* Do not allow writes past end of device */
+ if (unlikely((to + len) > mtd->size)) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: Attempt write to past end of device\n");
+ return -EINVAL;
+ }
+
+ /* Grab the lock and see if the device is available */
+ onenand_get_device(mtd, FL_WRITING);
+
+ /* Loop until all data write */
+ while (written < len) {
+ int thislen = min_t(int, mtd->oobsize, len - written);
+
+ column = to & (mtd->oobsize - 1);
+
+ this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
+
+ this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
+ this->write_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
+
+ this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
+
+ onenand_update_bufferram(mtd, to, 0);
+
+ status = this->wait(mtd, FL_WRITING);
+ if (status)
+ goto out;
+
+ written += thislen;
+
+ if (written == len)
+ break;
+
+ to += thislen;
+ buf += thislen;
+ }
+
+out:
+ /* Deselect and wake up anyone waiting on the device */
+ onenand_release_device(mtd);
+
+ *retlen = written;
+
+ return 0;
+}
+
+/**
+ * onenand_writev_ecc - [MTD Interface] write with iovec with ecc
+ * @param mtd MTD device structure
+ * @param vecs the iovectors to write
+ * @param count number of vectors
+ * @param to offset to write to
+ * @param retlen pointer to variable to store the number of written bytes
+ * @param eccbuf filesystem supplied oob data buffer
+ * @param oobsel oob selection structure
+ *
+ * OneNAND write with iovec with ecc
+ */
+static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen,
+ u_char *eccbuf, struct nand_oobinfo *oobsel)
+{
+ struct onenand_chip *this = mtd->priv;
+ unsigned char buffer[mtd->oobblock], *pbuf;
+ size_t total_len, len;
+ int i, written = 0;
+ int ret = 0;
+
+ /* Preset written len for early exit */
+ *retlen = 0;
+
+ /* Calculate total length of data */
+ total_len = 0;
+ for (i = 0; i < count; i++)
+ total_len += vecs[i].iov_len;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_writev_ecc: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count);
+
+ /* Do not allow write past end of the device */
+ if (unlikely((to + total_len) > mtd->size)) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempted write past end of device\n");
+ return -EINVAL;
+ }
+
+ /* Reject writes, which are not page aligned */
+ if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(total_len))) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempt to write not page aligned data\n");
+ return -EINVAL;
+ }
+
+ /* Grab the lock and see if the device is available */
+ onenand_get_device(mtd, FL_WRITING);
+
+ /* TODO handling oob */
+
+ /* Loop until all keve's data has been written */
+ len = 0;
+ while (count) {
+ pbuf = buffer;
+ /*
+ * If the given tuple is >= pagesize then
+ * write it out from the iov
+ */
+ if ((vecs->iov_len - len) >= mtd->oobblock) {
+ pbuf = vecs->iov_base + len;
+
+ len += mtd->oobblock;
+
+ /* Check, if we have to switch to the next tuple */
+ if (len >= (int) vecs->iov_len) {
+ vecs++;
+ len = 0;
+ count--;
+ }
+ } else {
+ int cnt = 0, thislen;
+ while (cnt < mtd->oobblock) {
+ thislen = min_t(int, mtd->oobblock - cnt, vecs->iov_len - len);
+ memcpy(buffer + cnt, vecs->iov_base + len, thislen);
+ cnt += thislen;
+ len += thislen;
+
+ /* Check, if we have to switch to the next tuple */
+ if (len >= (int) vecs->iov_len) {
+ vecs++;
+ len = 0;
+ count--;
+ }
+ }
+ }
+
+ this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
+
+ this->write_bufferram(mtd, ONENAND_DATARAM, pbuf, 0, mtd->oobblock);
+ this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
+
+ this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
+
+ onenand_update_bufferram(mtd, to, 1);
+
+ ret = this->wait(mtd, FL_WRITING);
+ if (ret) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: write failed %d\n", ret);
+ goto out;
+ }
+
+
+ /* Only check verify write turn on */
+ ret = onenand_verify_page(mtd, (u_char *) pbuf, to, block, page);
+ if (ret) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: verify failed %d\n", ret);
+ goto out;
+ }
+
+ written += mtd->oobblock;
+
+ to += mtd->oobblock;
+ }
+
+out:
+ /* Deselect and wakt up anyone waiting on the device */
+ onenand_release_device(mtd);
+
+ *retlen = written;
+
+ return 0;
+}
+
+/**
+ * onenand_writev - [MTD Interface] compabilty function for onenand_writev_ecc
+ * @param mtd MTD device structure
+ * @param vecs the iovectors to write
+ * @param count number of vectors
+ * @param to offset to write to
+ * @param retlen pointer to variable to store the number of written bytes
+ *
+ * OneNAND write with kvec. This just calls the ecc function
+ */
+static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen)
+{
+ return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL);
+}
+
+/**
+ * onenand_erase - [MTD Interface] erase block(s)
+ * @param mtd MTD device structure
+ * @param instr erase instruction
+ *
+ * Erase one ore more blocks
+ */
+static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct onenand_chip *this = mtd->priv;
+ unsigned int block_size;
+ loff_t addr;
+ int len;
+ int ret = 0;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len);
+
+ block_size = (1 << this->erase_shift);
+
+ /* Start address must align on block boundary */
+ if (unlikely(instr->addr & (block_size - 1))) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n");
+ return -EINVAL;
+ }
+
+ /* Length must align on block boundary */
+ if (unlikely(instr->len & (block_size - 1))) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Length not block aligned\n");
+ return -EINVAL;
+ }
+
+ /* Do not allow erase past end of device */
+ if (unlikely((instr->len + instr->addr) > mtd->size)) {
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Erase past end of device\n");
+ return -EINVAL;
+ }
+
+ instr->fail_addr = 0xffffffff;
+
+ /* Grab the lock and see if the device is available */
+ onenand_get_device(mtd, FL_ERASING);
+
+ /* Loop throught the pages */
+ len = instr->len;
+ addr = instr->addr;
+
+ instr->state = MTD_ERASING;
+
+ while (len) {
+
+ /* TODO Check badblock */
+
+ this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
+
+ ret = this->wait(mtd, FL_ERASING);
+ /* Check, if it is write protected */
+ if (ret) {
+ if (ret == -EPERM)
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
+ else
+ DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
+ instr->state = MTD_ERASE_FAILED;
+ instr->fail_addr = addr;
+ goto erase_exit;
+ }
+
+ len -= block_size;
+ addr += block_size;
+ }
+
+ instr->state = MTD_ERASE_DONE;
+
+erase_exit:
+
+ ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
+ /* Do call back function */
+ if (!ret)
+ mtd_erase_callback(instr);
+
+ /* Deselect and wake up anyone waiting on the device */
+ onenand_release_device(mtd);
+
+ return ret;
+}
+
+/**
+ * onenand_sync - [MTD Interface] sync
+ * @param mtd MTD device structure
+ *
+ * Sync is actually a wait for chip ready function
+ */
+static void onenand_sync(struct mtd_info *mtd)
+{
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
+
+ /* Grab the lock and see if the device is available */
+ onenand_get_device(mtd, FL_SYNCING);
+
+ /* Release it and go back */
+ onenand_release_device(mtd);
+}
+
+/**
+ * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
+ * @param mtd MTD device structure
+ * @param ofs offset relative to mtd start
+ */
+static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
+{
+ /*
+ * TODO
+ * 1. Bad block table (BBT)
+ * -> using NAND BBT to support JFFS2
+ * 2. Bad block management (BBM)
+ * -> bad block replace scheme
+ *
+ * Currently we do nothing
+ */
+ return 0;
+}
+
+/**
+ * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
+ * @param mtd MTD device structure
+ * @param ofs offset relative to mtd start
+ */
+static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+ /* see above */
+ return 0;
+}
+
+/**
+ * onenand_unlock - [MTD Interface] Unlock block(s)
+ * @param mtd MTD device structure
+ * @param ofs offset relative to mtd start
+ * @param len number of bytes to unlock
+ *
+ * Unlock one or more blocks
+ */
+static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+ struct onenand_chip *this = mtd->priv;
+ int start, end, block, value, status;
+
+ start = ofs >> this->erase_shift;
+ end = len >> this->erase_shift;
+
+ /* Continuous lock scheme */
+ if (this->options & ONENAND_CONT_LOCK) {
+ /* Set start block address */
+ this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
+ /* Set end block address */
+ this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
+ /* Write unlock command */
+ this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
+
+ /* There's no return value */
+ this->wait(mtd, FL_UNLOCKING);
+
+ /* Sanity check */
+ while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
+ & ONENAND_CTRL_ONGO)
+ continue;
+
+ /* Check lock status */
+ status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
+ if (!(status & ONENAND_WP_US))
+ printk(KERN_ERR "wp status = 0x%x\n", status);
+
+ return 0;
+ }
+
+ /* Block lock scheme */
+ for (block = start; block < end; block++) {
+ /* Set start block address */
+ this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
+ /* Write unlock command */
+ this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
+
+ /* There's no return value */
+ this->wait(mtd, FL_UNLOCKING);
+
+ /* Sanity check */
+ while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
+ & ONENAND_CTRL_ONGO)
+ continue;
+
+ /* Set block address for read block status */
+ value = onenand_block_address(this->device_id, block);
+ this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
+
+ /* Check lock status */
+ status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
+ if (!(status & ONENAND_WP_US))
+ printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
+ }
+
+ return 0;
+}
+
+/**
+ * onenand_print_device_info - Print device ID
+ * @param device device ID
+ *
+ * Print device ID
+ */
+static void onenand_print_device_info(int device)
+{
+ int vcc, demuxed, ddp, density;
+
+ vcc = device & ONENAND_DEVICE_VCC_MASK;
+ demuxed = device & ONENAND_DEVICE_IS_DEMUX;
+ ddp = device & ONENAND_DEVICE_IS_DDP;
+ density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
+ printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
+ demuxed ? "" : "Muxed ",
+ ddp ? "(DDP)" : "",
+ (16 << density),
+ vcc ? "2.65/3.3" : "1.8",
+ device);
+}
+
+static const struct onenand_manufacturers onenand_manuf_ids[] = {
+ {ONENAND_MFR_SAMSUNG, "Samsung"},
+ {ONENAND_MFR_UNKNOWN, "Unknown"}
+};
+
+/**
+ * onenand_check_maf - Check manufacturer ID
+ * @param manuf manufacturer ID
+ *
+ * Check manufacturer ID
+ */
+static int onenand_check_maf(int manuf)
+{
+ int i;
+
+ for (i = 0; onenand_manuf_ids[i].id; i++) {
+ if (manuf == onenand_manuf_ids[i].id)
+ break;
+ }
+
+ printk(KERN_DEBUG "OneNAND Manufacturer: %s\n",
+ onenand_manuf_ids[i].name);
+
+ return (i != ONENAND_MFR_UNKNOWN);
+}
+
+/**
+ * onenand_probe - [OneNAND Interface] Probe the OneNAND device
+ * @param mtd MTD device structure
+ *
+ * OneNAND detection method:
+ * Compare the the values from command with ones from register
+ */
+static int onenand_probe(struct mtd_info *mtd)
+{
+ struct onenand_chip *this = mtd->priv;
+ int bram_maf_id, bram_dev_id, maf_id, dev_id;
+ int version_id;
+ int density;
+
+ /* Send the command for reading device ID from BootRAM */
+ this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
+
+ /* Read manufacturer and device IDs from BootRAM */
+ bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
+ bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
+
+ /* Check manufacturer ID */
+ if (onenand_check_maf(bram_maf_id))
+ return -ENXIO;
+
+ /* Reset OneNAND to read default register values */
+ this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
+
+ /* Read manufacturer and device IDs from Register */
+ maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
+ dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
+
+ /* Check OneNAND device */
+ if (maf_id != bram_maf_id || dev_id != bram_dev_id)
+ return -ENXIO;
+
+ /* Flash device information */
+ onenand_print_device_info(dev_id);
+ this->device_id = dev_id;
+
+ density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
+ this->chipsize = (16 << density) << 20;
+
+ /* OneNAND page size & block size */
+ /* The data buffer size is equal to page size */
+ mtd->oobblock = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
+ mtd->oobsize = mtd->oobblock >> 5;
+ /* Pagers per block is always 64 in OneNAND */
+ mtd->erasesize = mtd->oobblock << 6;
+
+ this->erase_shift = ffs(mtd->erasesize) - 1;
+ this->page_shift = ffs(mtd->oobblock) - 1;
+ this->ppb_shift = (this->erase_shift - this->page_shift);
+ this->page_mask = (mtd->erasesize / mtd->oobblock) - 1;
+
+ /* REVIST: Multichip handling */
+
+ mtd->size = this->chipsize;
+
+ /* Version ID */
+ version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
+ printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id);
+
+ /* Lock scheme */
+ if (density <= ONENAND_DEVICE_DENSITY_512Mb &&
+ !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) {
+ printk(KERN_INFO "Lock scheme is Continues Lock\n");
+ this->options |= ONENAND_CONT_LOCK;
+ }
+
+ return 0;
+}
+
+
+/**
+ * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
+ * @param mtd MTD device structure
+ * @param maxchips Number of chips to scan for
+ *
+ * This fills out all the not initialized function pointers
+ * with the defaults.
+ * The flash ID is read and the mtd/chip structures are
+ * filled with the appropriate values.
+ */
+int onenand_scan(struct mtd_info *mtd, int maxchips)
+{
+ struct onenand_chip *this = mtd->priv;
+
+ if (!this->read_word)
+ this->read_word = onenand_readw;
+ if (!this->write_word)
+ this->write_word = onenand_writew;
+
+ if (!this->command)
+ this->command = onenand_command;
+ if (!this->wait)
+ this->wait = onenand_wait;
+
+ if (!this->read_bufferram)
+ this->read_bufferram = onenand_read_bufferram;
+ if (!this->write_bufferram)
+ this->write_bufferram = onenand_write_bufferram;
+
+ if (onenand_probe(mtd))
+ return -ENXIO;
+
+ this->state = FL_READY;
+ init_waitqueue_head(&this->wq);
+ spin_lock_init(&this->chip_lock);
+
+ switch (mtd->oobsize) {
+ case 64:
+ this->autooob = &onenand_oob_64;
+ break;
+
+ case 32:
+ this->autooob = &onenand_oob_32;
+ break;
+
+ default:
+ printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
+ mtd->oobsize);
+ /* To prevent kernel oops */
+ this->autooob = &onenand_oob_32;
+ break;
+ }
+
+ memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
+
+ /* Fill in remaining MTD driver data */
+ mtd->type = MTD_NANDFLASH;
+ mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC;
+ mtd->ecctype = MTD_ECC_SW;
+ mtd->erase = onenand_erase;
+ mtd->point = NULL;
+ mtd->unpoint = NULL;
+ mtd->read = onenand_read;
+ mtd->write = onenand_write;
+ mtd->read_ecc = onenand_read_ecc;
+ mtd->write_ecc = onenand_write_ecc;
+ mtd->read_oob = onenand_read_oob;
+ mtd->write_oob = onenand_write_oob;
+ mtd->readv = NULL;
+ mtd->readv_ecc = NULL;
+ mtd->writev = onenand_writev;
+ mtd->writev_ecc = onenand_writev_ecc;
+ mtd->sync = onenand_sync;
+ mtd->lock = NULL;
+ mtd->unlock = onenand_unlock;
+ mtd->suspend = NULL;
+ mtd->resume = NULL;
+ mtd->block_isbad = onenand_block_isbad;
+ mtd->block_markbad = onenand_block_markbad;
+ mtd->owner = THIS_MODULE;
+
+ /* Unlock whole block */
+ mtd->unlock(mtd, 0x0, this->chipsize);
+
+ return 0;
+}
+
+/**
+ * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
+ * @param mtd MTD device structure
+ */
+void onenand_release(struct mtd_info *mtd)
+{
+#ifdef CONFIG_MTD_PARTITIONS
+ /* Deregister partitions */
+ del_mtd_partitions (mtd);
+#endif
+ /* Deregister the device */
+ del_mtd_device (mtd);
+}
+
+EXPORT_SYMBOL_GPL(onenand_scan);
+EXPORT_SYMBOL_GPL(onenand_release);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_DESCRIPTION("Generic OneNAND flash driver code");