From: Mona Anonuevo<manonuevo@xxxxxxxxxx>
This patch adds support for a generic spinand framework(spinand_mtd.c).
This frameowrk can be used for other spi based flash devices also. The idea
is to have a common model under drivers/mtd, as also present for other no spi
devices(there is a generic framework and device part simply attaches itself to it.)
The generic frework will be used later by me for a SPI based spansion S25FL256 device.
The patch also contains a micron driver attaching itself to generic framework.
Signed-off-by: Mona Anonuevo<manonuevo@xxxxxxxxxx>
Signed-off-by: Tuan Nguyen<tqnguyen@xxxxxxxxxx>
Signed-off-by: Sourav Poddar<sourav.poddar@xxxxxx>
----
[I picked this as a standalone patch, can split it into generic and device part
based on community feedback.]
drivers/mtd/Kconfig | 2 +
drivers/mtd/Makefile | 2 +
drivers/mtd/spinand/Kconfig | 24 ++
drivers/mtd/spinand/Makefile | 10 +
drivers/mtd/spinand/spinand_lld.c | 776 +++++++++++++++++++++++++++++++++++++
drivers/mtd/spinand/spinand_mtd.c | 690 +++++++++++++++++++++++++++++++++
include/linux/mtd/spinand.h | 155 ++++++++
7 files changed, 1659 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/spinand/Kconfig
create mode 100644 drivers/mtd/spinand/Makefile
create mode 100644 drivers/mtd/spinand/spinand_lld.c
create mode 100644 drivers/mtd/spinand/spinand_mtd.c
create mode 100644 include/linux/mtd/spinand.h
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 5fab4e6..c9e6c60 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -318,6 +318,8 @@ source "drivers/mtd/nand/Kconfig"
source "drivers/mtd/onenand/Kconfig"
+source "drivers/mtd/spinand/Kconfig"
+
source "drivers/mtd/lpddr/Kconfig"
source "drivers/mtd/ubi/Kconfig"
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 4cfb31e..cce68db 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -32,4 +32,6 @@ inftl-objs := inftlcore.o inftlmount.o
obj-y += chips/ lpddr/ maps/ devices/ nand/ onenand/ tests/
+obj-y += spinand/
+
obj-$(CONFIG_MTD_UBI) += ubi/
diff --git a/drivers/mtd/spinand/Kconfig b/drivers/mtd/spinand/Kconfig
new file mode 100644
index 0000000..38c739f
--- /dev/null
+++ b/drivers/mtd/spinand/Kconfig
@@ -0,0 +1,24 @@
+#
+# linux/drivers/mtd/spinand/Kconfig
+#
+
+menuconfig MTD_SPINAND
+ tristate "SPINAND Device Support"
+ depends on MTD
+ help
+ This enables support for accessing Micron SPI NAND flash
+ devices.
+
+if MTD_SPINAND
+
+config MTD_SPINAND_ONDIEECC
+ bool "Use SPINAND internal ECC"
+ help
+ Internel ECC
+
+config MTD_SPINAND_SWECC
+ bool "Use software ECC"
+ depends on MTD_NAND
+ help
+ software ECC
+endif
diff --git a/drivers/mtd/spinand/Makefile b/drivers/mtd/spinand/Makefile
new file mode 100644
index 0000000..355e726
--- /dev/null
+++ b/drivers/mtd/spinand/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for the SPI NAND MTD
+#
+
+# Core functionality.
+obj-$(CONFIG_MTD_SPINAND) += spinand.o
+
+spinand-objs := spinand_mtd.o spinand_lld.o
+
+
diff --git a/drivers/mtd/spinand/spinand_lld.c b/drivers/mtd/spinand/spinand_lld.c
new file mode 100644
index 0000000..9f53737
--- /dev/null
+++ b/drivers/mtd/spinand/spinand_lld.c
@@ -0,0 +1,776 @@
+/*
+spinand_lld.c
+
+Copyright (c) 2009-2010 Micron Technology, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+*/
+
+#include<linux/init.h>
+#include<linux/module.h>
+#include<linux/device.h>
+#include<linux/interrupt.h>
+#include<linux/mutex.h>
+#include<linux/math64.h>
+
+#include<linux/mtd/mtd.h>
+#include<linux/mtd/partitions.h>
+#include<linux/mtd/spinand.h>
+
+#include<linux/spi/spi.h>
+#include<linux/spi/flash.h>
+
+#define mu_spi_nand_driver_version "Beagle-MTD_01.00_Linux2.6.33_20100507"
+#define SPI_NAND_MICRON_DRIVER_KEY 0x1233567
+
+/****************************************************************************/
+
+/**
+ OOB area specification layout: Total 32 available free bytes.
+*/
+static struct nand_ecclayout spinand_oob_64 = {
+ .eccbytes = 24,
+ .eccpos = {
+ 1, 2, 3, 4, 5, 6,
+ 17, 18, 19, 20, 21, 22,
+ 33, 34, 35, 36, 37, 38,
+ 49, 50, 51, 52, 53, 54, },
+ .oobavail = 32,
+ .oobfree = {
+ {.offset = 8,
+ .length = 8},
+ {.offset = 24,
+ .length = 8},
+ {.offset = 40,
+ .length = 8},
+ {.offset = 56,
+ .length = 8}, }
+};
+/**
+ * spinand_cmd - to process a command to send to the SPI Nand
+ *
+ * Description:
+ * Set up the command buffer to send to the SPI controller.
+ * The command buffer has to initized to 0
+ */
+int spinand_cmd(struct spi_device *spi, struct spinand_cmd *cmd)
+{
+ int ret;
+ struct spi_message message;
+ struct spi_transfer x[4];
+ u8 dummy = 0xff;
+
+ spi_message_init(&message);
+ memset(x, 0, sizeof(x));
+
+ x[0].len = 1;
+ x[0].tx_buf =&cmd->cmd;
+ spi_message_add_tail(&x[0],&message);
+
+ if (cmd->n_addr) {
+ x[1].len = cmd->n_addr;
+ x[1].tx_buf = cmd->addr;
+ spi_message_add_tail(&x[1],&message);
+ }
+
+ if (cmd->n_dummy) {
+ x[2].len = cmd->n_dummy;
+ x[2].tx_buf =&dummy;
+ spi_message_add_tail(&x[2],&message);
+ }
+
+ if (cmd->n_tx) {
+ x[3].len = cmd->n_tx;
+ x[3].tx_buf = cmd->tx_buf;
+ spi_message_add_tail(&x[3],&message);
+ }
+
+ if (cmd->n_rx) {
+ x[3].len = cmd->n_rx;
+ x[3].rx_buf = cmd->rx_buf;
+ spi_message_add_tail(&x[3],&message);
+ }
+
+ ret = spi_sync(spi,&message);
+
+ return ret;
+}
+
+/**
+ * spinand_reset- send reset command "0xff" to the Nand device
+ *
+ * Description:
+ * Reset the SPI Nand with the reset command 0xff
+*/
+static int spinand_reset(struct spi_device *spi_nand)
+{
+ struct spinand_cmd cmd = {0};
+
+ cmd.cmd = CMD_RESET;
+
+ return spinand_cmd(spi_nand,&cmd);
+}
+
+/**
+ * spinand_read_id- Read SPI Nand ID
+ *
+ * Description:
+ * Read ID: read two ID bytes from the SPI Nand device
+*/
+static int spinand_read_id(struct spi_device *spi_nand, u8 *id)
+{
+ struct spinand_cmd cmd = {0};
+ ssize_t retval;
+
+ cmd.cmd = CMD_READ_ID;
+ cmd.n_dummy = 1;
+ cmd.n_rx = 2;
+ cmd.rx_buf = id;
+
+ retval = spinand_cmd(spi_nand,&cmd);
+
+ if (retval != 0) {
+ dev_err(&spi_nand->dev, "error %d reading id\n",
+ (int) retval);
+ return retval;
+ }
+
+ return 0;
+}
+
+/**
+ * spinand_lock_block- send write register 0x1f command to the Nand device
+ *
+ * Description:
+ * After power up, all the Nand blocks are locked. This function allows
+ * one to unlock the blocks, and so it can be wriiten or erased.
+*/
+static int spinand_lock_block(struct spi_device *spi_nand,
+ struct spinand_info *info, u8 lock)
+{
+ struct spinand_cmd cmd = {0};
+ ssize_t retval;
+
+ cmd.cmd = CMD_WRITE_REG;
+ cmd.n_addr = 1;
+ cmd.addr[0] = REG_BLOCK_LOCK;
+ cmd.n_tx = 1;
+ cmd.tx_buf =&lock;
+
+ retval = spinand_cmd(spi_nand,&cmd);
+
+ if (retval != 0) {
+ dev_err(&spi_nand->dev, "error %d lock block\n",
+ (int) retval);
+ return retval;
+ }
+
+ return 0;
+}
+
+/**
+ * spinand_read_status- send command 0xf to the SPI Nand status register
+ *
+ * Description:
+ * After read, write, or erase, the Nand device is expected to
+ set the busy status.
+ * This function is to allow reading the status of the command:
+ read, write, and erase.
+ * Once the status turns to be ready, the other status bits also
+ are valid status bits.
+*/
+static int spinand_read_status(struct spi_device *spi_nand,
+ struct spinand_info *info, u8 *status)
+{
+ struct spinand_cmd cmd = {0};
+ ssize_t retval;
+
+ cmd.cmd = CMD_READ_REG;
+ cmd.n_addr = 1;
+ cmd.addr[0] = REG_STATUS;
+ cmd.n_rx = 1;
+ cmd.rx_buf = status;
+
+ retval = spinand_cmd(spi_nand,&cmd);
+
+ if (retval != 0) {
+ dev_err(&spi_nand->dev, "error %d reading status register\n",
+ (int) retval);
+ return retval;
+ }
+
+ return 0;
+}
+
+/**
+ * spinand_get_otp- send command 0xf to read the SPI Nand OTP register
+ *
+ * Description:
+ * There is one bit( bit 0x10 ) to set or to clear the internal ECC.
+ * Enable chip internal ECC, set the bit to 1
+ * Disable chip internal ECC, clear the bit to 0
+ */
+static int spinand_get_otp(struct spi_device *spi_nand,
+ struct spinand_info *info, u8 *otp)
+{
+ struct spinand_cmd cmd = {0};
+ ssize_t retval;
+
+ cmd.cmd = CMD_READ_REG;
+ cmd.n_addr = 1;
+ cmd.addr[0] = REG_OTP;
+ cmd.n_rx = 1;
+ cmd.rx_buf = otp;
+
+ retval = spinand_cmd(spi_nand,&cmd);
+
+ if (retval != 0) {
+ dev_err(&spi_nand->dev, "error %d get otp\n",
+ (int) retval);
+ return retval;
+ }
+
+ return 0;
+}
+
+/**
+ * spinand_set_otp- send command 0x1f to write the SPI Nand OTP register
+ *
+ * Description:
+ * There is one bit( bit 0x10 ) to set or to clear the internal ECC.
+ * Enable chip internal ECC, set the bit to 1
+ * Disable chip internal ECC, clear the bit to 0
+*/
+static int spinand_set_otp(struct spi_device *spi_nand,
+ struct spinand_info *info, u8 *otp)
+{
+ struct spinand_cmd cmd = {0};
+ ssize_t retval;
+
+ cmd.cmd = CMD_WRITE_REG;
+ cmd.n_addr = 1;
+ cmd.addr[0] = REG_OTP;
+ cmd.n_tx = 1;
+ cmd.tx_buf = otp;
+
+ retval = spinand_cmd(spi_nand,&cmd);
+
+ if (retval != 0) {
+ dev_err(&spi_nand->dev, "error %d set otp\n",
+ (int) retval);
+ return retval;
+ }
+
+ return 0;
+}
+
+/**
+ * sspinand_enable_ecc- send command 0x1f to write the SPI Nand OTP register
+ *
+ * Description:
+ * There is one bit( bit 0x10 ) to set or to clear the internal ECC.
+ * Enable chip internal ECC, set the bit to 1
+ * Disable chip internal ECC, clear the bit to 0
+*/
+#ifdef CONFIG_MTD_SPINAND_ONDIEECC
+static int spinand_enable_ecc(struct spi_device *spi_nand,
+ struct spinand_info *info)
+{
+ ssize_t retval;
+ u8 otp = 0;
+
+ retval = spinand_get_otp(spi_nand, info,&otp);
+
+ if ((otp& OTP_ECC_MASK) == OTP_ECC_MASK) {
+ return 0;
+ } else {
+ otp |= OTP_ECC_MASK;
+ retval = spinand_set_otp(spi_nand, info,&otp);
+ retval = spinand_get_otp(spi_nand, info,&otp);
+ return retval;
+ }
+}
+#else
+static int spinand_disable_ecc(struct spi_device *spi_nand,
+ struct spinand_info *info)
+{
+ ssize_t retval;
+ u8 otp = 0;
+
+ retval = spinand_get_otp(spi_nand, info,&otp);
+
+ if ((otp& OTP_ECC_MASK) == OTP_ECC_MASK) {
+ otp&= ~OTP_ECC_MASK;
+ retval = spinand_set_otp(spi_nand, info,&otp);
+ retval = spinand_get_otp(spi_nand, info,&otp);
+ return retval;
+ } else {
+ return 0;
+ }
+}
+#endif
+
+/**
+ * sspinand_write_enable- send command 0x06 to enable write or erase the Nand cells
+ *
+ * Description:
+ * Before write and erase the Nand cells, the write enable has to be set.
+ * After the write or erase, the write enable bit is automatically
+ cleared( status register bit 2 )
+ * Set the bit 2 of the status register has the same effect
+*/
+static int spinand_write_enable(struct spi_device *spi_nand,
+ struct spinand_info *info)
+{
+ struct spinand_cmd cmd = {0};
+
+ cmd.cmd = CMD_WR_ENABLE;
+
+ return spinand_cmd(spi_nand,&cmd);
+}
+
+static int spinand_read_page_to_cache(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id)
+{
+ struct spinand_cmd cmd = {0};
+ u16 row;
+
+ row = page_id;
+
+ cmd.cmd = CMD_READ;
+ cmd.n_addr = 3;
+ cmd.addr[1] = (u8)((row& 0xff00)>> 8);
+ cmd.addr[2] = (u8)(row& 0x00ff);
+
+ return spinand_cmd(spi_nand,&cmd);
+}
+
+/**
+ * spinand_read_from_cache- send command 0x03 to read out the data from the
+ cache register( 2112 bytes max )
+ *
+ * Description:
+ * The read can specify 1 to 2112 bytes of data read at the
+ coresponded locations.
+ * No tRd delay.
+*/
+static int spinand_read_from_cache(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 byte_id, u16 len, u8 *rbuf)
+{
+ struct spinand_cmd cmd = {0};
+ u16 column;
+
+ column = byte_id;
+
+ cmd.cmd = CMD_READ_RDM;
+ cmd.n_addr = 2;
+ cmd.addr[0] = (u8)((column&0xff00)>>8);
+ cmd.addr[1] = (u8)(column&0x00ff);
+ cmd.n_dummy = 1;
+ cmd.n_rx = len;
+ cmd.rx_buf = rbuf;
+
+ return spinand_cmd(spi_nand,&cmd);
+}
+
+/**
+ * spinand_read_page-to read a page with:
+ * @page_id: the physical page number
+ * @offset: the location from 0 to 2111
+ * @len: number of bytes to read
+ * @rbuf: read buffer to hold @len bytes
+ *
+ * Description:
+ * The read icludes two commands to the Nand: 0x13 and 0x03 commands
+ * Poll to read status to wait for tRD time.
+ */
+static int spinand_read_page(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id, u16 offset,
+ u16 len, u8 *rbuf)
+{
+ ssize_t retval;
+ u8 status = 0;
+
+ retval = spinand_read_page_to_cache(spi_nand, info, page_id);
+
+ while (1) {
+ retval = spinand_read_status(spi_nand, info,&status);
+ if (retval< 0) {
+ dev_err(&spi_nand->dev, "error %d reading status register\n",
+ (int) retval);
+ return retval;
+ }
+
+ if ((status& STATUS_OIP_MASK) == STATUS_READY) {
+ if ((status& STATUS_ECC_MASK) == STATUS_ECC_ERROR) {
+ dev_err(&spi_nand->dev,
+ "ecc error, page=%d\n", page_id);
+ }
+ break;
+ }
+ }
+
+ retval = spinand_read_from_cache(spi_nand, info, offset, len, rbuf);
+ return 0;
+}
+
+/**
+ * spinand_program_data_to_cache--to write a page to cache with:
+ * @byte_id: the location to write to the cache
+ * @len: number of bytes to write
+ * @rbuf: read buffer to hold @len bytes
+ *
+ * Description:
+ * The write command used here is 0x84--indicating that the cache
+ is not cleared first.
+ * Since it is writing the data to cache, there is no tPROG time.
+ */
+static int spinand_program_data_to_cache(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 byte_id, u16 len, u8 *wbuf)
+{
+ struct spinand_cmd cmd = {0};
+ u16 column;
+
+ column = byte_id;
+
+ cmd.cmd = CMD_PROG_PAGE_CLRCACHE;
+ cmd.n_addr = 2;
+ cmd.addr[0] = (u8)((column& 0xff00)>> 8);
+ cmd.addr[1] = (u8)(column& 0x00ff);
+ cmd.n_tx = len;
+ cmd.tx_buf = wbuf;
+
+ return spinand_cmd(spi_nand,&cmd);
+}
+
+/**
+ * spinand_program_execute--to write a page from cache to the Nand array with:
+ * @page_id: the physical page location to write the page.
+ *
+ * Description:
+ * The write command used here is 0x10--indicating the cache is
+ writing to the Nand array.
+ * Need to wait for tPROG time to finish the transaction.
+ */
+static int spinand_program_execute(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id)
+{
+ struct spinand_cmd cmd = {0};
+ u16 row;
+
+ row = page_id;
+
+ cmd.cmd = CMD_PROG_PAGE_EXC;
+ cmd.n_addr = 3;
+ cmd.addr[1] = (u8)((row& 0xff00)>> 8);
+ cmd.addr[2] = (u8)(row& 0x00ff);
+
+ return spinand_cmd(spi_nand,&cmd);
+}
+
+/**
+ * spinand_program_page--to write a page with:
+ * @page_id: the physical page location to write the page.
+ * @offset: the location from the cache starting from 0 to 2111
+ * @len: the number of bytes to write
+ * @wbuf: the buffer to hold the number of bytes
+ *
+ * Description:
+ * The commands used here are 0x06, 0x84, and 0x10--indicating that
+ the write enable is first
+ * sent, the write cache command, and the write execute command
+ * Poll to wait for the tPROG time to finish the transaction.
+ */
+static int spinand_program_page(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id, u16 offset,
+ u16 len, u8 *wbuf)
+{
+ ssize_t retval;
+ u8 status = 0;
+
+ retval = spinand_write_enable(spi_nand, info);
+
+ retval = spinand_program_data_to_cache(spi_nand, info, offset,
+ len, wbuf);
+
+ retval = spinand_program_execute(spi_nand, info, page_id);
+
+ while (1) {
+ retval = spinand_read_status(spi_nand, info,&status);
+ if (retval< 0) {
+ dev_err(&spi_nand->dev,
+ "error %d reading status register\n",
+ (int) retval);
+ return retval;
+ }
+
+ if ((status& STATUS_OIP_MASK) == STATUS_READY) {
+ if ((status& STATUS_P_FAIL_MASK) == STATUS_P_FAIL) {
+ dev_err(&spi_nand->dev,
+ "program error, page=%d\n", page_id);
+ return -1;
+ }
+ } else {
+ break;
+ }
+ }
+ return 0;
+}
+
+/**
+ * spinand_erase_block_erase--to erase a page with:
+ * @block_id: the physical block location to erase.
+ *
+ * Description:
+ * The command used here is 0xd8--indicating an erase
+command to erase one block--64 pages
+ * Need to wait for tERS.
+ */
+static int spinand_erase_block_erase(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 block_id)
+{
+ struct spinand_cmd cmd = {0};
+ u16 row;
+
+ row = block_id<< 6;
+ cmd.cmd = CMD_ERASE_BLK;
+ cmd.n_addr = 3;
+ cmd.addr[1] = (u8)((row& 0xff00)>> 8);
+ cmd.addr[2] = (u8)(row& 0x00ff);
+
+ return spinand_cmd(spi_nand,&cmd);
+}
+
+/**
+ * spinand_erase_block--to erase a page with:
+ * @block_id: the physical block location to erase.
+ *
+ * Description:
+ * The commands used here are 0x06 and 0xd8--indicating an erase
+ command to erase one block--64 pages
+ * It will first to enable the write enable bit ( 0x06 command ),
+ and then send the 0xd8 erase command
+ * Poll to wait for the tERS time to complete the tranaction.
+ */
+static int spinand_erase_block(struct spi_device *spi_nand,
+ struct spinand_info *info, u16 block_id)
+{
+ ssize_t retval;
+ u8 status = 0;
+
+ retval = spinand_write_enable(spi_nand, info);
+
+ retval = spinand_erase_block_erase(spi_nand, info, block_id);
+
+ while (1) {
+ retval = spinand_read_status(spi_nand, info,&status);
+ if (retval< 0) {
+ dev_err(&spi_nand->dev,
+ "error %d reading status register\n",
+ (int) retval);
+ return retval;
+ }
+
+ if ((status& STATUS_OIP_MASK) == STATUS_READY) {
+ if ((status& STATUS_E_FAIL_MASK) == STATUS_E_FAIL) {
+ dev_err(&spi_nand->dev,
+ "erase error, block=%d\n", block_id);
+ return -1;
+ } else {
+ break;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * spinand_get_info: get NAND info, from read id or const value
+ * Description:
+ * To set up the device parameters.
+ */
+static int spinand_get_info(struct spi_device *spi_nand,
+ struct spinand_info *info, u8 *id)
+{
+ if (id[0] == 0x2C&& (id[1] == 0x11 ||
+ id[1] == 0x12 || id[1] == 0x13)) {
+ info->mid = id[0];
+ info->did = id[1];
+ info->name = "MT29F1G01ZAC";
+ info->nand_size = (1024 * 64 * 2112);
+ info->usable_size = (1024 * 64 * 2048);
+ info->block_size = (2112*64);
+ info->block_main_size = (2048*64);
+ info->block_num_per_chip = 1024;
+ info->page_size = 2112;
+ info->page_main_size = 2048;
+ info->page_spare_size = 64;
+ info->page_num_per_block = 64;
+
+ info->block_shift = 17;
+ info->block_mask = 0x1ffff;
+
+ info->page_shift = 11;
+ info->page_mask = 0x7ff;
+
+ info->ecclayout =&spinand_oob_64;
+ }
+ return 0;
+}
+
+/**
+ * spinand_probe - [spinand Interface]
+ * @spi_nand: registered device driver.
+ *
+ * Description:
+ * To set up the device driver parameters to make the device available.
+*/
+static int spinand_probe(struct spi_device *spi_nand)
+{
+ ssize_t retval;
+ struct mtd_info *mtd;
+ struct spinand_chip *chip;
+ struct spinand_info *info;
+ struct flash_platform_data *data;
+ struct mtd_part_parser_data ppdata;
+ u8 id[2] = {0};
+
+ retval = spinand_reset(spi_nand);
+ retval = spinand_reset(spi_nand);
+ retval = spinand_read_id(spi_nand, (u8 *)&id);
+ if (id[0] == 0&& id[1] == 0) {
+ pr_info(KERN_INFO "SPINAND: read id error! 0x%02x, 0x%02x!\n",
+ id[0], id[1]);
+ return 0;
+ }
+
+ data = spi_nand->dev.platform_data;
+ info = kzalloc(sizeof(struct spinand_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ retval = spinand_get_info(spi_nand, info, (u8 *)&id);
+ pr_info(KERN_INFO "SPINAND: 0x%02x, 0x%02x, %s\n",
+ id[0], id[1], info->name);
+ pr_info(KERN_INFO "%s\n", mu_spi_nand_driver_version);
+ retval = spinand_lock_block(spi_nand, info, BL_ALL_UNLOCKED);
+
+#ifdef CONFIG_MTD_SPINAND_ONDIEECC
+ retval = spinand_enable_ecc(spi_nand, info);
+#else
+ retval = spinand_disable_ecc(spi_nand, info);
+#endif
+
+ ppdata.of_node = spi_nand->dev.of_node;
+
+ chip = kzalloc(sizeof(struct spinand_chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->spi_nand = spi_nand;
+ chip->info = info;
+ chip->reset = spinand_reset;
+ chip->read_id = spinand_read_id;
+ chip->read_page = spinand_read_page;
+ chip->program_page = spinand_program_page;
+ chip->erase_block = spinand_erase_block;
+
+ chip->buf = kzalloc(info->page_size, GFP_KERNEL);
+ if (!chip->buf)
+ return -ENOMEM;
+
+ chip->oobbuf = kzalloc(info->ecclayout->oobavail, GFP_KERNEL);
+ if (!chip->oobbuf)
+ return -ENOMEM;
+
+ mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
+ if (!mtd)
+ return -ENOMEM;
+
+ dev_set_drvdata(&spi_nand->dev, mtd);
+
+ mtd->priv = chip;
+
+ retval = spinand_mtd(mtd);
+
+ return mtd_device_parse_register(mtd, NULL,&ppdata,
+ data ? data->parts : NULL,
+ data ? data->nr_parts : 0);
+}
+
+/**
+ * __devexit spinand_remove--Remove the device driver
+ * @spi: the spi device.
+ *
+ * Description:
+ * To remove the device driver parameters and free up allocated memories.
+ */
+static int spinand_remove(struct spi_device *spi)
+{
+ struct mtd_info *mtd;
+ struct spinand_chip *chip;
+
+ pr_debug("%s: remove\n", dev_name(&spi->dev));
+
+ mtd = dev_get_drvdata(&spi->dev);
+
+ mtd_device_unregister(mtd);
+
+ chip = mtd->priv;
+
+ kfree(chip->info);
+ kfree(chip->buf);
+ kfree(chip->oobbuf);
+ kfree(chip);
+ kfree(mtd);
+
+ return 0;
+}
+
+/**
+ * Device name structure description
+*/
+static struct spi_driver spinand_driver = {
+ .driver = {
+ .name = "spi_nand",
+ .bus =&spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+
+ .probe = spinand_probe,
+ .remove = spinand_remove,
+};
+
+/**
+ * Device driver registration
+*/
+static int __init spinand_init(void)
+{
+ return spi_register_driver(&spinand_driver);
+}
+
+/**
+ * unregister Device driver.
+*/
+static void __exit spinand_exit(void)
+{
+ spi_unregister_driver(&spinand_driver);
+}
+
+module_init(spinand_init);
+module_exit(spinand_exit);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Henry Pan<hspan@xxxxxxxxxx>");
+MODULE_DESCRIPTION("SPI NAND driver code");
diff --git a/drivers/mtd/spinand/spinand_mtd.c b/drivers/mtd/spinand/spinand_mtd.c
new file mode 100644
index 0000000..8bfff86
--- /dev/null
+++ b/drivers/mtd/spinand/spinand_mtd.c
@@ -0,0 +1,690 @@
+/*
+spinand_mtd.c
+
+Copyright (c) 2009-2010 Micron Technology, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+*/
+
+#include<linux/kernel.h>
+#include<linux/module.h>
+#include<linux/init.h>
+#include<linux/sched.h>
+#include<linux/delay.h>
+#include<linux/interrupt.h>
+#include<linux/jiffies.h>
+#include<linux/mtd/mtd.h>
+#include<linux/mtd/partitions.h>
+#include<linux/mtd/spinand.h>
+#include<linux/mtd/nand_ecc.h>
+
+/**
+ * spinand_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
+ */
+#define mu_spi_nand_driver_version "Beagle-MTD_01.00_Linux2.6.33_20100507"
+
+static int spinand_get_device(struct mtd_info *mtd, int new_state)
+{
+ struct spinand_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;
+ }
+ if (new_state == FL_PM_SUSPENDED) {
+ spin_unlock(&this->chip_lock);
+ return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
+ }
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&this->wq,&wait);
+ spin_unlock(&this->chip_lock);
+ schedule();
+ remove_wait_queue(&this->wq,&wait);
+ }
+ return 0;
+}
+
+/**
+ * spinand_release_device - [GENERIC] release chip
+ * @param mtd MTD device structure
+ *
+ * Deselect, release chip lock and wake up anyone waiting on the device
+ */
+static void spinand_release_device(struct mtd_info *mtd)
+{
+ struct spinand_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);
+}
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+static void spinand_calculate_ecc(struct mtd_info *mtd)
+{
+ int i;
+ int eccsize = 512;
+ int eccbytes = 3;
+ int eccsteps = 4;
+ int ecctotal = 12;
+ struct spinand_chip *chip = mtd->priv;
+ struct spinand_info *info = chip->info;
+ unsigned char *p = chip->buf;
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
+ __nand_calculate_ecc(p, eccsize,&chip->ecc_calc[i]);
+
+ for (i = 0; i< ecctotal; i++)
+ chip->buf[info->page_main_size +
+ info->ecclayout->eccpos[i]] = chip->ecc_calc[i];
+}
+
+static int spinand_correct_data(struct mtd_info *mtd)
+{
+ int i;
+ int eccsize = 512;
+ int eccbytes = 3;
+ int eccsteps = 4;
+ int ecctotal = 12;
+ struct spinand_chip *chip = mtd->priv;
+ struct spinand_info *info = chip->info;
+ unsigned char *p = chip->buf;
+ int errcode = 0;
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
+ __nand_calculate_ecc(p, eccsize,&chip->ecc_calc[i]);
+
+ for (i = 0; i< ecctotal; i++)
+ chip->ecc_code[i] = chip->buf[info->page_main_size +
+ info->ecclayout->eccpos[i]];
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+ int stat;
+
+ stat = __nand_correct_data(p,&chip->ecc_code[i],
+ &chip->ecc_calc[i], eccsize);
+ if (stat< 0)
+ errcode = -1;
+ else if (stat == 1)
+ errcode = 1;
+ }
+ return errcode;
+}
+#endif
+
+static int spinand_read_ops(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ int page_id, page_offset, page_num, oob_num;
+
+ int count;
+ int main_ok, main_left, main_offset;
+ int oob_ok, oob_left;
+
+ signed int retval;
+ signed int errcode = 0;
+
+ if (!chip->buf)
+ return -1;
+
+ page_id = from>> info->page_shift;
+
+ /* for main data */
+ page_offset = from& info->page_mask;
+ page_num = (page_offset + ops->len +
+ info->page_main_size - 1) / info->page_main_size;
+
+ /* for oob */
+ if (info->ecclayout->oobavail)
+ oob_num = (ops->ooblen +
+ info->ecclayout->oobavail - 1) / info->ecclayout->oobavail;
+ else
+ oob_num = 0;
+
+ count = 0;
+
+ main_left = ops->len;
+ main_ok = 0;
+ main_offset = page_offset;
+
+ oob_left = ops->ooblen;
+ oob_ok = 0;
+
+ while (1) {
+ if (count< page_num || count< oob_num) {
+ memset(chip->buf, 0, info->page_size);
+ retval = chip->read_page(spi_nand, info,
+ page_id + count, 0, info->page_size,
+ chip->buf);
+ if (retval != 0) {
+ errcode = -1;
+ pr_info(KERN_INFO
+ "spinand_read_ops: fail, page=%d!\n",
+ page_id);
+ return errcode;
+ }
+ } else {
+ break;
+ }
+ if (count< page_num&& ops->datbuf) {
+ int size;
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+ retval = spinand_correct_data(mtd);
+ if (retval == -1)
+ pr_info(KERN_INFO
+ "SWECC uncorrectable error! page=%x\n",
+ page_id+count);
+ else if (retval == 1)
+ pr_info(KERN_INFO
+ "SWECC 1 bit error, corrected! page=%x\n",
+ page_id+count);
+#endif
+
+ if ((main_offset + main_left)< info->page_main_size)
+ size = main_left;
+ else
+ size = info->page_main_size - main_offset;
+
+ memcpy(ops->datbuf + main_ok, chip->buf, size);
+
+ main_ok += size;
+ main_left -= size;
+ main_offset = 0;
+ ops->retlen = main_ok;
+ }
+
+ if (count< oob_num&& ops->oobbuf&& chip->oobbuf) {
+ int size;
+ int offset, len, temp;
+
+ /* repack spare to oob */
+ memset(chip->oobbuf, 0, info->ecclayout->oobavail);
+
+ temp = 0;
+ offset = info->ecclayout->oobfree[0].offset;
+ len = info->ecclayout->oobfree[0].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[1].offset;
+ len = info->ecclayout->oobfree[1].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[2].offset;
+ len = info->ecclayout->oobfree[2].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[3].offset;
+ len = info->ecclayout->oobfree[3].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ /* copy oobbuf to ops oobbuf */
+ if (oob_left< info->ecclayout->oobavail)
+ size = oob_left;
+ else
+ size = info->ecclayout->oobavail;
+
+ memcpy(ops->oobbuf + oob_ok, chip->oobbuf, size);
+
+ oob_ok += size;
+ oob_left -= size;
+
+ ops->oobretlen = oob_ok;
+ }
+ count++;
+ }
+ return errcode;
+}
+
+static int spinand_write_ops(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ int page_id, page_offset, page_num, oob_num;
+
+ int count;
+
+ int main_ok, main_left, main_offset;
+ int oob_ok, oob_left;
+
+ signed int retval;
+ signed int errcode = 0;
+
+ if (!chip->buf)
+ return -1;
+
+ page_id = to>> info->page_shift;
+
+ /* for main data */
+ page_offset = to& info->page_mask;
+ page_num = (page_offset + ops->len +
+ info->page_main_size - 1) / info->page_main_size;
+
+ /* for oob */
+ if (info->ecclayout->oobavail)
+ oob_num = (ops->ooblen +
+ info->ecclayout->oobavail - 1) / info->ecclayout->oobavail;
+ else
+ oob_num = 0;
+
+ count = 0;
+
+ main_left = ops->len;
+ main_ok = 0;
+ main_offset = page_offset;
+
+ oob_left = ops->ooblen;
+ oob_ok = 0;
+
+ while (1) {
+ if (count< page_num || count< oob_num)
+ memset(chip->buf, 0xFF, info->page_size);
+ else
+ break;
+
+ if (count< page_num&& ops->datbuf) {
+ int size;
+
+ if ((main_offset + main_left)< info->page_main_size)
+ size = main_left;
+ else
+ size = info->page_main_size - main_offset;
+
+ memcpy(chip->buf, ops->datbuf + main_ok, size);
+
+ main_ok += size;
+ main_left -= size;
+ main_offset = 0;
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+ spinand_calculate_ecc(mtd);
+#endif
+ }
+
+ if (count< oob_num&& ops->oobbuf&& chip->oobbuf) {
+ int size;
+ int offset, len, temp;
+
+ memset(chip->oobbuf, 0xFF, info->ecclayout->oobavail);
+
+ if (oob_left< info->ecclayout->oobavail)
+ size = oob_left;
+ else
+ size = info->ecclayout->oobavail;
+
+ memcpy(chip->oobbuf, ops->oobbuf + oob_ok, size);
+
+ oob_ok += size;
+ oob_left -= size;
+
+ /* repack oob to spare */
+ temp = 0;
+ offset = info->ecclayout->oobfree[0].offset;
+ len = info->ecclayout->oobfree[0].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[1].offset;
+ len = info->ecclayout->oobfree[1].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[2].offset;
+ len = info->ecclayout->oobfree[2].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[3].offset;
+ len = info->ecclayout->oobfree[3].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+ }
+
+ if (count< page_num || count< oob_num) {
+ retval = chip->program_page(spi_nand, info,
+ page_id + count, 0, info->page_size, chip->buf);
+ if (retval != 0) {
+ errcode = -1;
+ pr_err(KERN_INFO "spinand_write_ops: fail, page=%d!\n", page_id);
+
+ return errcode;
+ }
+ }
+
+ if (count< page_num&& ops->datbuf)
+ ops->retlen = main_ok;
+
+ if (count< oob_num&& ops->oobbuf&& chip->oobbuf)
+ ops->oobretlen = oob_ok;
+
+ count++;
+ }
+ return errcode;
+}
+
+static int spinand_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct mtd_oob_ops ops = {0};
+ int ret;
+
+ /* Do not allow reads past end of device */
+ if ((from + len)> mtd->size)
+ return -EINVAL;
+
+ if (!len)
+ return 0;
+
+ spinand_get_device(mtd, FL_READING);
+
+ ops.len = len;
+ ops.datbuf = buf;
+
+ ret = spinand_read_ops(mtd, from,&ops);
+
+ *retlen = ops.retlen;
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+static int spinand_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct mtd_oob_ops ops = {0};
+ int ret;
+
+ /* Do not allow reads past end of device */
+ if ((to + len)> mtd->size)
+ return -EINVAL;
+ if (!len)
+ return 0;
+
+ spinand_get_device(mtd, FL_WRITING);
+
+ ops.len = len;
+ ops.datbuf = (uint8_t *)buf;
+
+ ret = spinand_write_ops(mtd, to,&ops);
+
+ *retlen = ops.retlen;
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+static int spinand_read_oob(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ int ret;
+
+ spinand_get_device(mtd, FL_READING);
+
+ ret = spinand_read_ops(mtd, from, ops);
+
+ spinand_release_device(mtd);
+ return ret;
+}
+
+static int spinand_write_oob(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ int ret;
+
+ spinand_get_device(mtd, FL_WRITING);
+
+ ret = spinand_write_ops(mtd, to, ops);
+
+ spinand_release_device(mtd);
+ return ret;
+}
+
+/**
+ * spinand_erase - [MTD Interface] erase block(s)
+ * @param mtd MTD device structure
+ * @param instr erase instruction
+ *
+ * Erase one ore more blocks
+ */
+static int spinand_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ u16 block_id, block_num, count;
+ signed int retval = 0;
+ signed int errcode = 0;
+
+ pr_info("spinand_erase: start = 0x%012llx, len = %llu\n",
+ (unsigned long long)instr->addr, (unsigned long long)instr->len);
+
+ /* check address align on block boundary */
+ if (instr->addr& (info->block_main_size - 1)) {
+ pr_err("spinand_erase: Unaligned address\n");
+ return -EINVAL;
+ }
+
+ if (instr->len& (info->block_main_size - 1)) {
+ pr_err("spinand_erase: ""Length not block aligned\n");
+ return -EINVAL;
+ }
+
+ /* Do not allow erase past end of device */
+ if ((instr->len + instr->addr)> info->usable_size) {
+ pr_err("spinand_erase: ""Erase past end of device\n");
+ return -EINVAL;
+ }
+
+ instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
+
+ /* Grab the lock and see if the device is available */
+ spinand_get_device(mtd, FL_ERASING);
+
+ block_id = instr->addr>> info->block_shift;
+ block_num = instr->len>> info->block_shift;
+ count = 0;
+
+ while (count< block_num) {
+ retval = chip->erase_block(spi_nand, info, block_id + count);
+
+ if (retval != 0) {
+ retval = chip->erase_block(spi_nand, info,
+ block_id + count);
+ if (retval != 0) {
+ pr_info(KERN_INFO "spinand_erase: fail, block=%d!\n",
+ block_id + count);
+ errcode = -1;
+ }
+ }
+ count++;
+ }
+
+ if (errcode == 0)
+ instr->state = MTD_ERASE_DONE;
+
+ /* Deselect and wake up anyone waiting on the device */
+ spinand_release_device(mtd);
+
+ /* Do call back function */
+ if (instr->callback)
+ instr->callback(instr);
+
+ return errcode;
+}
+
+/**
+ * spinand_sync - [MTD Interface] sync
+ * @param mtd MTD device structure
+ *
+ * Sync is actually a wait for chip ready function
+ */
+static void spinand_sync(struct mtd_info *mtd)
+{
+ pr_debug("spinand_sync: called\n");
+
+ /* Grab the lock and see if the device is available */
+ spinand_get_device(mtd, FL_SYNCING);
+
+ /* Release it and go back */
+ spinand_release_device(mtd);
+}
+
+static int spinand_block_isbad(struct mtd_info *mtd, loff_t ofs)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ u16 block_id;
+ u8 is_bad = 0x00;
+ u8 ret = 0;
+
+ spinand_get_device(mtd, FL_READING);
+
+ block_id = ofs>> info->block_shift;
+
+ chip->read_page(spi_nand, info, block_id*info->page_num_per_block,
+ info->page_main_size, 1,&is_bad);
+
+ if (is_bad != 0xFF)
+ ret = 1;
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+/**
+ * spinand_block_markbad - [MTD Interface] Mark bad block
+ * @param mtd MTD device structure
+ * @param ofs Bad block number
+ */
+static int spinand_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ u16 block_id;
+ u8 is_bad = 0x00;
+ u8 ret = 0;
+
+ spinand_get_device(mtd, FL_WRITING);
+
+ block_id = ofs>> info->block_shift;
+
+ chip->program_page(spi_nand, info, block_id*info->page_num_per_block,
+ info->page_main_size, 1,&is_bad);
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+
+/**
+ * spinand_suspend - [MTD Interface] Suspend the spinand flash
+ * @param mtd MTD device structure
+ */
+static int spinand_suspend(struct mtd_info *mtd)
+{
+ return spinand_get_device(mtd, FL_PM_SUSPENDED);
+}
+
+/**
+ * spinand_resume - [MTD Interface] Resume the spinand flash
+ * @param mtd MTD device structure
+ */
+static void spinand_resume(struct mtd_info *mtd)
+{
+ struct spinand_chip *this = mtd->priv;
+
+ if (this->state == FL_PM_SUSPENDED)
+ spinand_release_device(mtd);
+ else
+ pr_err(KERN_ERR "resume() called for the chip which is not" "in suspended state\n");
+}
+
+/**
+ * spinand_mtd - add MTD device with parameters
+ * @param mtd MTD device structure
+ *
+ * Add MTD device with parameters.
+ */
+int spinand_mtd(struct mtd_info *mtd)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spinand_info *info = chip->info;
+
+ chip->state = FL_READY;
+ init_waitqueue_head(&chip->wq);
+ spin_lock_init(&chip->chip_lock);
+
+ mtd->name = info->name;
+ mtd->size = info->usable_size;
+ mtd->erasesize = info->block_main_size;
+ mtd->writesize = info->page_main_size;
+ mtd->oobsize = info->page_spare_size;
+ mtd->owner = THIS_MODULE;
+ mtd->type = MTD_NANDFLASH;
+ mtd->flags = MTD_CAP_NANDFLASH;
+
+ mtd->ecclayout = info->ecclayout;
+
+ mtd->_erase = spinand_erase;
+ mtd->_point = NULL;
+ mtd->_unpoint = NULL;
+ mtd->_read = spinand_read;
+ mtd->_write = spinand_write;
+ mtd->_read_oob = spinand_read_oob;
+ mtd->_write_oob = spinand_write_oob;
+ mtd->_sync = spinand_sync;
+ mtd->_lock = NULL;
+ mtd->_unlock = NULL;
+ mtd->_suspend = spinand_suspend;
+ mtd->_resume = spinand_resume;
+ mtd->_block_isbad = spinand_block_isbad;
+ mtd->_block_markbad = spinand_block_markbad;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(spinand_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Henry Pan<hspan@xxxxxxxxxx>");
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
new file mode 100644
index 0000000..3b8802a
--- /dev/null
+++ b/include/linux/mtd/spinand.h
@@ -0,0 +1,155 @@
+/*
+ * linux/include/linux/mtd/spinand.h
+ * Copyright (c) 2009-2010 Micron Technology, Inc.
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+/bin/bash: 4: command not found
+ *
+ * based on nand.h
+ */
+#ifndef __LINUX_MTD_SPI_NAND_H
+#define __LINUX_MTD_SPI_NAND_H
+
+#include<linux/wait.h>
+#include<linux/spinlock.h>
+#include<linux/mtd/mtd.h>
+
+/* cmd */
+#define CMD_READ 0x13
+#define CMD_READ_RDM 0x03
+#define CMD_PROG_PAGE_CLRCACHE 0x02
+#define CMD_PROG_PAGE 0x84
+#define CMD_PROG_PAGE_EXC 0x10
+#define CMD_ERASE_BLK 0xd8
+#define CMD_WR_ENABLE 0x06
+#define CMD_WR_DISABLE 0x04
+#define CMD_READ_ID 0x9f
+#define CMD_RESET 0xff
+#define CMD_READ_REG 0x0f
+#define CMD_WRITE_REG 0x1f
+
+/* feature/ status reg */
+#define REG_BLOCK_LOCK 0xa0
+#define REG_OTP 0xb0
+#define REG_STATUS 0xc0/* timing */
+
+/* status */
+#define STATUS_OIP_MASK 0x01
+#define STATUS_READY (0<< 0)
+#define STATUS_BUSY (1<< 0)
+
+#define STATUS_E_FAIL_MASK 0x04
+#define STATUS_E_FAIL (1<< 2)
+
+#define STATUS_P_FAIL_MASK 0x08
+#define STATUS_P_FAIL (1<< 3)
+
+#define STATUS_ECC_MASK 0x30
+#define STATUS_ECC_1BIT_CORRECTED (1<< 4)
+#define STATUS_ECC_ERROR (2<< 4)
+#define STATUS_ECC_RESERVED (3<< 4)
+
+
+/*ECC enable defines*/
+#define OTP_ECC_MASK 0x10
+#define OTP_ECC_OFF 0
+#define OTP_ECC_ON 1
+
+#define ECC_DISABLED
+#define ECC_IN_NAND
+#define ECC_SOFT
+
+/* block lock */
+#define BL_ALL_LOCKED 0x38
+#define BL_1_2_LOCKED 0x30
+#define BL_1_4_LOCKED 0x28
+#define BL_1_8_LOCKED 0x20
+#define BL_1_16_LOCKED 0x18
+#define BL_1_32_LOCKED 0x10
+#define BL_1_64_LOCKED 0x08
+#define BL_ALL_UNLOCKED 0
+
+struct spinand_info {
+ u8 mid;
+ u8 did;
+ char *name;
+ u64 nand_size;
+ u64 usable_size;
+
+ u32 block_size;
+ u32 block_main_size;
+ /*u32 block_spare_size; */
+ u16 block_num_per_chip;
+ u16 page_size;
+ u16 page_main_size;
+ u16 page_spare_size;
+ u16 page_num_per_block;
+ u8 block_shift;
+ u32 block_mask;
+ u8 page_shift;
+ u16 page_mask;
+
+ struct nand_ecclayout *ecclayout;
+};
+
+typedef enum {
+ FL_READY,
+ FL_READING,
+ FL_WRITING,
+ FL_ERASING,
+ FL_SYNCING,
+ FL_LOCKING,
+ FL_RESETING,
+ FL_OTPING,
+ FL_PM_SUSPENDED,
+} spinand_state_t;
+
+struct spinand_chip { /* used for multi chip */
+ spinlock_t chip_lock;
+ wait_queue_head_t wq;
+ spinand_state_t state;
+ struct spi_device *spi_nand;
+ struct spinand_info *info;
+ /*struct mtd_info *mtd; */
+
+ int (*reset) (struct spi_device *spi_nand);
+ int (*read_id) (struct spi_device *spi_nand, u8 *id);
+ int (*read_page) (struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id, u16 offset,
+ u16 len, u8 *rbuf);
+ int (*program_page) (struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id, u16 offset,
+ u16 len, u8 *wbuf);
+ int (*erase_block) (struct spi_device *spi_nand,
+ struct spinand_info *info, u16 block_id);
+
+ u8 *buf;
+ u8 *oobbuf; /* temp buffer */
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+ u8 ecc_calc[12];
+ u8 ecc_code[12];
+#endif
+};
+
+struct spinand_cmd {
+ u8 cmd;
+ unsigned n_addr;
+ u8 addr[3];
+ unsigned n_dummy;
+ unsigned n_tx;
+ u8 *tx_buf;
+ unsigned n_rx;
+ u8 *rx_buf;
+};
+
+extern int spinand_mtd(struct mtd_info *mtd);
+extern void spinand_mtd_release(struct mtd_info *mtd);
+
+#endif
