ENGR00099697 Add nand driver for mx35

Add nand driver for mx35

Signed-off-by:Jason Liu <r64343@freescale.com>

1 files changed, 1148 insertions, 0 deletions

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
new file mode 100644
index 0000000000..d458d0add0
--- /dev/null
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -0,0 +1,1148 @@
+/*
+ * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <nand.h>
+#include <linux/mtd/compat.h>
+#include <asm-arm/arch/mxc_nand.h>
+
+struct nand_info {
+	int status_req;
+	int large_page;
+	int auto_mode;
+	u16 col_addr;
+	u8 num_of_intlv;
+	int page_mask;
+	int hw_ecc;
+	u8 *data_buf;
+	u8 *oob_buf;
+};
+
+/*
+ * Define delays in microsec for NAND device operations
+ */
+#define TROP_US_DELAY   2000
+
+/*
+ * OOB placement block for use with hardware ecc generation
+ */
+static struct nand_oobinfo nand_hw_eccoob_512 = {
+	.useecc = MTD_NANDECC_AUTOPL_USR,
+	.eccbytes = 9,
+	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
+	.oobfree = {{0, 4} }
+};
+
+static struct nand_oobinfo nand_hw_eccoob_2k = {
+	.useecc = MTD_NANDECC_AUTOPL_USR,
+	.eccbytes = 9,
+	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
+	.oobfree = {{2, 4} }
+};
+
+static struct nand_oobinfo nand_hw_eccoob_4k = {
+	.useecc = MTD_NANDECC_AUTOPL_USR,
+	.eccbytes = 9,
+	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
+	.oobfree = {{2, 4} }
+};
+
+/*!
+ * @defgroup NAND_MTD NAND Flash MTD Driver for MXC processors
+ */
+
+/*!
+ * @file mxc_nd2.c
+ *
+ * @brief This file contains the hardware specific layer for NAND Flash on
+ * MXC processor
+ *
+ * @ingroup NAND_MTD
+ */
+
+/*!
+ * Half word access.Added for U-boot.
+ */
+static void *nfc_memcpy(void *dest, const void *src, size_t n)
+{
+	u16 *dst_16 = (u16 *) dest;
+	const u16 *src_16 = (u16 *) src;
+
+	while (n > 0) {
+		*dst_16++ = *src_16++;
+		n -= 2;
+	}
+
+	return dest;
+}
+
+/*
+ * Functions to transfer data to/from spare erea.
+ */
+static void
+copy_spare(struct mtd_info *mtd, void *pbuf, void *pspare, int len, int bfrom)
+{
+	u16 i, j;
+	u16 m = mtd->oobsize;
+	u16 n = mtd->oobblock >> 9;
+	u8 *d = (u8 *) pbuf;
+	u8 *s = (u8 *) pspare;
+	u16 t = SPARE_LEN;
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	m /= info->num_of_intlv;
+	n /= info->num_of_intlv;
+
+	j = (m / n >> 1) << 1;
+
+	if (bfrom) {
+		for (i = 0; i < n - 1; i++)
+			nfc_memcpy(&d[i * j], &s[i * t], j);
+
+		/* the last section */
+		nfc_memcpy(&d[i * j], &s[i * t], len - i * j);
+	} else {
+		for (i = 0; i < n - 1; i++)
+			nfc_memcpy(&s[i * t], &d[i * j], j);
+
+		/* the last section */
+		nfc_memcpy(&s[i * t], &d[i * j], len - i * j);
+	}
+}
+
+/*!
+ * This function polls the NFC to wait for the basic operation to complete by
+ * checking the INT bit of config2 register.
+ *
+ * @param       maxRetries     number of retry attempts (separated by 1 us)
+ * @param       useirq         True if IRQ should be used rather than polling
+ */
+static void wait_op_done(int max_retries)
+{
+
+	while (max_retries-- > 0) {
+		if (raw_read(REG_NFC_OPS_STAT) & NFC_OPS_STAT) {
+			WRITE_NFC_IP_REG((raw_read(REG_NFC_OPS_STAT) &
+					~NFC_OPS_STAT),
+					REG_NFC_OPS_STAT);
+			break;
+		}
+		udelay(1);
+	}
+	if (max_retries <= 0)
+		DEBUG(MTD_DEBUG_LEVEL0, "wait: INT not set\n");
+}
+
+static void send_cmd_atomic(struct mtd_info *mtd, u16 cmd)
+{
+	/* fill command */
+	raw_write(cmd, REG_NFC_FLASH_CMD);
+
+	/* clear status */
+	ACK_OPS;
+
+	/* send out command */
+	raw_write(NFC_CMD, REG_NFC_OPS);
+
+	/* Wait for operation to complete */
+	wait_op_done(TROP_US_DELAY);
+}
+
+static void send_cmd_auto(struct mtd_info *mtd, u16 cmd)
+{
+#ifdef CONFIG_MXC_NFC_SP_AUTO
+	switch (cmd) {
+	case NAND_CMD_READ0:
+	case NAND_CMD_READOOB:
+		raw_write(NAND_CMD_READ0, REG_NFC_FLASH_CMD);
+		break;
+	case NAND_CMD_SEQIN:
+	case NAND_CMD_ERASE1:
+		raw_write(cmd, REG_NFC_FLASH_CMD);
+		break;
+	case NAND_CMD_PAGEPROG:
+	case NAND_CMD_ERASE2:
+	case NAND_CMD_READSTART:
+		raw_write(raw_read(REG_NFC_FLASH_CMD) | cmd << NFC_CMD_1_SHIFT,
+			  REG_NFC_FLASH_CMD);
+		send_cmd_interleave(mtd, cmd);
+		break;
+	case NAND_CMD_READID:
+		send_atomic_cmd(cmd);
+		send_addr(0);
+		break;
+	case NAND_CMD_RESET:
+		send_cmd_interleave(mtd, cmd);
+	case NAND_CMD_STATUS:
+		break;
+	default:
+		break;
+	}
+#endif
+}
+
+/*!
+ * This function handle the interleave related work
+ * @param	mtd	mtd info
+ * @param	cmd	command
+ */
+static void send_cmd_interleave(struct mtd_info *mtd, u16 cmd)
+{
+#ifdef CONFIG_MXC_NFC_SP_AUTO
+	u32 i;
+	u32 j = num_of_intlv;
+	struct nand_chip *this = mtd->priv;
+	u32 addr_low = raw_read(NFC_FLASH_ADDR0);
+	u32 addr_high = raw_read(NFC_FLASH_ADDR8);
+	u32 page_addr = addr_low >> 16 | addr_high << 16;
+	u8 *dbuf = mtd->info.data_buf;
+	u8 *obuf = mtd->info.oob_buf;
+	u32 dlen = mtd->oobblock / j;
+	u32 olen = mtd->oobsize / j;
+
+	/* adjust the addr value
+	 * since ADD_OP mode is 01
+	 */
+	if (j > 1)
+		page_addr *= j;
+	else
+		page_addr *= this->numchips;
+
+	for (i = 0; i < j; i++) {
+		if (cmd == NAND_CMD_PAGEPROG) {
+
+			/* reset addr cycle */
+			if (j > 1)
+				mxc_nand_addr_cycle(mtd, 0, page_addr++);
+
+			/* data transfer */
+			nfc_memcpy(MAIN_AREA0, dbuf, dlen);
+			copy_spare(mtd, obuf, SPARE_AREA0, olen, 0);
+
+			/* update the value */
+			dbuf += dlen;
+			obuf += olen;
+
+			NFC_SET_RBA(0);
+			raw_write(0, REG_NFC_OPS_STAT);
+			raw_write(NFC_AUTO_PROG, REG_NFC_OPS);
+
+			/* wait auto_prog_done bit set */
+			if (i < j - 1) {
+				while (!
+				       (raw_read(REG_NFC_OPS_STAT) & 1 << 30))
+					;
+			} else {
+				wait_op_done(TROP_US_DELAY);
+			}
+		} else if (cmd == NAND_CMD_READSTART) {
+			/* reset addr cycle */
+			if (j > 1)
+				mxc_nand_addr_cycle(mtd, 0, page_addr++);
+
+			NFC_SET_RBA(0);
+			raw_write(0, REG_NFC_OPS_STAT);
+			raw_write(NFC_AUTO_READ, REG_NFC_OPS);
+			wait_op_done(TROP_US_DELAY);
+
+			/* check ecc error */
+			mxc_nand_ecc_status(mtd);
+
+			/* data transfer */
+			nfc_memcpy(dbuf, MAIN_AREA0, dlen);
+			copy_spare(mtd, obuf, SPARE_AREA0, olen, 1);
+
+			/* update the value */
+			dbuf += dlen;
+			obuf += olen;
+		} else if (cmd == NAND_CMD_ERASE2) {
+			if (!i) {
+				page_addr = addr_low;
+				page_addr *= (j > 1 ? j : this->numchips);
+			}
+			mxc_nand_addr_cycle(mtd, -1, page_addr++);
+			raw_write(NFC_AUTO_ERASE, REG_NFC_OPS);
+			wait_op_done(TROP_US_DELAY);
+		} else if (cmd == NAND_CMD_RESET) {
+			NFC_SET_NFC_ACTIVE_CS(i);
+			send_atomic_cmd(cmd);
+		}
+	}
+#endif
+}
+
+/*!
+ * This function issues the specified command to the NAND device and
+ * waits for completion.
+ *
+ * @param       cmd     command for NAND Flash
+ * @param       useirq  True if IRQ should be used rather than polling
+ */
+static void send_cmd(struct mtd_info *mtd, u16 cmd)
+{
+
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	if (info->auto_mode)
+		send_cmd_auto(mtd, cmd);
+	else
+		send_cmd_atomic(mtd, cmd);
+
+	DEBUG(MTD_DEBUG_LEVEL3, "send_cmd(0x%x, %d)\n", cmd);
+}
+
+/*!
+ * This function sends an address (or partial address) to the
+ * NAND device.  The address is used to select the source/destination for
+ * a NAND command.
+ *
+ * @param       addr    address to be written to NFC.
+ * @param       useirq  True if IRQ should be used rather than polling
+ */
+static void send_addr(u16 addr)
+{
+	DEBUG(MTD_DEBUG_LEVEL3, "send_addr(0x%x %d)\n", addr);
+
+	/* fill address */
+	raw_write((addr << NFC_FLASH_ADDR_SHIFT), REG_NFC_FLASH_ADDR);
+
+	/* clear status */
+	ACK_OPS;
+
+	/* send out address */
+	raw_write(NFC_ADDR, REG_NFC_OPS);
+
+	/* Wait for operation to complete */
+	wait_op_done(TROP_US_DELAY);
+}
+
+/*!
+ * This function requests the NFC to initate the transfer
+ * of data currently in the NFC RAM buffer to the NAND device.
+ *
+ * @param	buf_id	      Specify Internal RAM Buffer number
+ */
+static void send_prog_page(struct mtd_info *mtd, u8 buf_id)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	if (!info->auto_mode) {
+		/* set ram buffer id */
+		NFC_SET_RBA(buf_id);
+
+		/* clear status */
+		ACK_OPS;
+
+		/* transfer data from NFC ram to nand */
+		raw_write(NFC_INPUT, REG_NFC_OPS);
+
+		/* Wait for operation to complete */
+		wait_op_done(TROP_US_DELAY);
+
+		DEBUG(MTD_DEBUG_LEVEL3, "%s\n", __func__);
+	}
+}
+
+/*!
+ * This function requests the NFC to initated the transfer
+ * of data from the NAND device into in the NFC ram buffer.
+ *
+ * @param  	buf_id		Specify Internal RAM Buffer number
+ */
+static void send_read_page(struct mtd_info *mtd, u8 buf_id)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	if (!info->auto_mode) {
+
+		/* set ram buffer id */
+		NFC_SET_RBA(buf_id);
+
+		/* clear status */
+		ACK_OPS;
+
+		/* transfer data from nand to NFC ram */
+		raw_write(NFC_OUTPUT, REG_NFC_OPS);
+
+		/* Wait for operation to complete */
+		wait_op_done(TROP_US_DELAY);
+
+		DEBUG(MTD_DEBUG_LEVEL3, "%s(%d)\n", __func__, buf_id);
+
+	}
+
+}
+
+/*!
+ * This function requests the NFC to perform a read of the
+ * NAND device ID.
+ */
+static void send_read_id(void)
+{
+	/* Set RBA bits for BUFFER0 */
+	NFC_SET_RBA(0);
+
+	/* clear status */
+	ACK_OPS;
+
+	/* Read ID into main buffer */
+	raw_write(NFC_ID, REG_NFC_OPS);
+
+	/* Wait for operation to complete */
+	wait_op_done(TROP_US_DELAY);
+
+}
+
+static u16 mxc_do_status_auto(struct mtd_info *mtd)
+{
+	u16 status = 0;
+#ifdef CONFIG_MXC_NFC_SP_AUTO
+	int i = 0;
+	u32 mask = 0xFF << 16;
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	for (; i < info->num_of_intlv; i++) {
+
+		/* set ative cs */
+		NFC_SET_NFC_ACTIVE_CS(i);
+
+		raw_write(NFC_AUTO_STATE, REG_NFC_OPS);
+
+		/* FIXME, NFC Auto erase may have
+		 * problem, have to pollingit until
+		 * the nand get idle, otherwise
+		 * it may get error
+		 */
+		do {
+			status = (raw_read(NFC_CONFIG1) & mask) >> 16;
+		} while ((status & NAND_STATUS_READY) == 0);
+
+		if (status & NAND_STATUS_FAIL)
+			break;
+	}
+#endif
+	return status;
+}
+
+static u16 mxc_do_status_atomic(struct mtd_info *mtd)
+{
+	volatile u16 *mainBuf = MAIN_AREA1;
+	u8 val = 1;
+	u16 ret;
+
+	/* Set ram buffer id */
+	NFC_SET_RBA(val);
+
+	/* clear status */
+	ACK_OPS;
+
+	/* Read status into main buffer */
+	raw_write(NFC_STATUS, REG_NFC_OPS);
+
+	/* Wait for operation to complete */
+	wait_op_done(TROP_US_DELAY);
+
+	/* Status is placed in first word of main buffer */
+	/* get status, then recovery area 1 data */
+	ret = *mainBuf;
+
+	return ret;
+}
+
+/*!
+ * This function requests the NFC to perform a read of the
+ * NAND device status and returns the current status.
+ *
+ * @return  device status
+ */
+static u16 mxc_nand_get_status(struct mtd_info *mtd)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+	u16 status;
+
+	if (info->auto_mode)
+		status = mxc_do_status_auto(mtd);
+	else
+		status = mxc_do_status_atomic(mtd);
+
+	return status;
+
+}
+
+static void mxc_nand_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+	raw_write((raw_read(REG_NFC_ECC_EN) | NFC_ECC_EN), REG_NFC_ECC_EN);
+	return;
+}
+
+/*
+ * Function to record the ECC corrected/uncorrected errors resulted
+ * after a page read. This NFC detects and corrects upto to 4 symbols
+ * of 9-bits each.
+ */
+static int mxc_nand_ecc_status(struct mtd_info *mtd)
+{
+	u32 ecc_stat, err;
+	int no_subpages = 1;
+	int ret = 0;
+	u8 ecc_bit_mask, err_limit;
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	ecc_bit_mask = (IS_4BIT_ECC ? 0x7 : 0xf);
+	err_limit = (IS_4BIT_ECC ? 0x4 : 0x8);
+
+	no_subpages = mtd->oobblock >> 9;
+
+	no_subpages /= info->num_of_intlv;
+
+	ecc_stat = GET_NFC_ECC_STATUS();
+	do {
+		err = ecc_stat & ecc_bit_mask;
+		if (err > err_limit) {
+			printk(KERN_WARNING "UnCorrectable RS-ECC Error\n");
+			return -1;
+		} else {
+			ret += err;
+		}
+		ecc_stat >>= 4;
+	} while (--no_subpages);
+
+	DEBUG(MTD_DEBUG_LEVEL3, "%d Symbol Correctable RS-ECC Error\n", ret);
+
+	return ret;
+}
+
+/*
+ * Function to correct the detected errors. This NFC corrects all the errors
+ * detected. So this function just return 0.
+ */
+static int mxc_nand_correct_data(struct mtd_info *mtd, u_char *dat,
+				 u_char *read_ecc, u_char *calc_ecc)
+{
+	return 0;
+}
+
+/*
+ * Function to calculate the ECC for the data to be stored in the Nand device.
+ * This NFC has a hardware RS(511,503) ECC engine together with the RS ECC
+ * CONTROL blocks are responsible for detection  and correction of up to
+ * 8 symbols of 9 bits each in 528 byte page.
+ * So this function is just return 0.
+ */
+
+static int mxc_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
+				  u_char *ecc_code)
+{
+	return 0;
+}
+
+/*!
+ * This function id is used to 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 \b len is
+ * then copied to buffer \b buf.
+ *
+ * @param       mtd     MTD structure for the NAND Flash
+ * @param       buf     data to be read from NAND Flash
+ * @param       len     number of bytes to be read
+ */
+static void mxc_nand_read_buf(struct mtd_info *mtd, u_char * buf, int len)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+	u16 col = info->col_addr;
+	u8 *data_buf = info->data_buf;
+	u8 *oob_buf = info->oob_buf;
+
+	if (mtd->oobblock) {
+
+		int j = mtd->oobblock - col;
+		int n = mtd->oobsize + j;
+
+		n = min(n, len);
+
+		if (j > 0) {
+			if (n > j) {
+				memcpy(buf, &data_buf[col], j);
+				memcpy(buf + j, &oob_buf[0], n - j);
+			} else {
+				memcpy(buf, &data_buf[col], n);
+			}
+		} else {
+			col -= mtd->oobblock;
+			memcpy(buf, &oob_buf[col], len);
+		}
+
+		/* update */
+		info->col_addr += n;
+
+	} else {
+		/* At flash identify phase,
+		 * mtd->oobblock has not been
+		 * set correctly, it should
+		 * be zero.And len will less 2
+		 */
+		memcpy(buf, &data_buf[col], len);
+
+		/* update */
+		info->col_addr += len;
+	}
+
+}
+
+/*!
+ * This function reads byte from the NAND Flash
+ *
+ * @param       mtd     MTD structure for the NAND Flash
+ *
+ * @return    data read from the NAND Flash
+ */
+static uint8_t mxc_nand_read_byte(struct mtd_info *mtd)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+	uint8_t ret;
+
+	/* Check for status request */
+	if (info->status_req)
+		return mxc_nand_get_status(mtd) & 0xFF;
+
+	mxc_nand_read_buf(mtd, &ret, 1);
+
+	return ret;
+}
+
+/*!
+  * This function reads word from the NAND Flash
+  *
+  * @param     mtd     MTD structure for the NAND Flash
+  *
+  * @return    data read from the NAND Flash
+  */
+static u16 mxc_nand_read_word(struct mtd_info *mtd)
+{
+	u16 ret;
+
+	mxc_nand_read_buf(mtd, (uint8_t *) &ret, sizeof(u16));
+
+	return ret;
+}
+
+/*!
+ * This function reads byte from the NAND Flash
+ *
+ * @param     mtd     MTD structure for the NAND Flash
+ *
+ * @return    data read from the NAND Flash
+ */
+static u_char mxc_nand_read_byte16(struct mtd_info *mtd)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	/* Check for status request */
+	if (info->status_req)
+		return mxc_nand_get_status(mtd) & 0xFF;
+
+	return mxc_nand_read_word(mtd) & 0xFF;
+}
+
+/*!
+ * This function writes data of length \b len from buffer \b buf to the NAND
+ * internal RAM buffer's MAIN area 0.
+ *
+ * @param       mtd     MTD structure for the NAND Flash
+ * @param       buf     data to be written to NAND Flash
+ * @param       len     number of bytes to be written
+ */
+static void mxc_nand_write_buf(struct mtd_info *mtd,
+			       const u_char *buf, int len)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+	u16 col = info->col_addr;
+	u8 *data_buf = info->data_buf;
+	u8 *oob_buf = info->oob_buf;
+	int j = mtd->oobblock - col;
+	int n = mtd->oobsize + j;
+
+	n = min(n, len);
+
+	if (j > 0) {
+		if (n > j) {
+			memcpy(&data_buf[col], buf, j);
+			memcpy(&oob_buf[0], buf + j, n - j);
+		} else {
+			memcpy(&data_buf[col], buf, n);
+		}
+	} else {
+		col -= mtd->oobblock;
+		memcpy(&oob_buf[col], buf, len);
+	}
+
+	/* update */
+	info->col_addr += n;
+}
+
+/*!
+ * This function is used by the upper layer to verify the data in NAND Flash
+ * with the data in the \b buf.
+ *
+ * @param       mtd     MTD structure for the NAND Flash
+ * @param       buf     data to be verified
+ * @param       len     length of the data to be verified
+ *
+ * @return      -EFAULT if error else 0
+ *
+ */
+static int mxc_nand_verify_buf(struct mtd_info *mtd, const u_char *buf,
+			       int len)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+	u_char *s = info->data_buf;
+
+	const u_char *p = buf;
+
+	for (; len > 0; len--) {
+		if (*p++ != *s++)
+			return -1;
+	}
+
+	return 0;
+}
+
+/*!
+ * This function is used by upper layer for select and deselect of the NAND
+ * chip
+ *
+ * @param       mtd     MTD structure for the NAND Flash
+ * @param       chip    val indicating select or deselect
+ */
+static void mxc_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+
+	switch (chip) {
+	case -1:
+		break;
+
+	case 0 ... 7:
+		NFC_SET_NFC_ACTIVE_CS(chip);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void mxc_do_addr_cycle_auto(struct mtd_info *mtd, int column,
+							int page_addr)
+{
+#ifdef CONFIG_MXC_NFC_SP_AUTO
+	if (page_addr != -1 && column != -1) {
+		u32 mask = 0xFFFF;
+		/* the column address */
+		raw_write(column & mask, NFC_FLASH_ADDR0);
+		raw_write((raw_read(NFC_FLASH_ADDR0) |
+			   ((page_addr & mask) << 16)), NFC_FLASH_ADDR0);
+		/* the row address */
+		raw_write(((raw_read(NFC_FLASH_ADDR8) & (mask << 16)) |
+			   ((page_addr & (mask << 16)) >> 16)),
+			  NFC_FLASH_ADDR8);
+	} else if (page_addr != -1) {
+		raw_write(page_addr, NFC_FLASH_ADDR0);
+	}
+
+	DEBUG(MTD_DEBUG_LEVEL3,
+	      "AutoMode:the ADDR REGS value is (0x%x, 0x%x)\n",
+	      raw_read(NFC_FLASH_ADDR0), raw_read(NFC_FLASH_ADDR8));
+#endif
+}
+
+static void mxc_do_addr_cycle_atomic(struct mtd_info *mtd, int column,
+							int page_addr)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	u32 page_mask = info->page_mask;
+
+	if (column != -1) {
+		send_addr(column & 0xFF);
+		if (IS_2K_PAGE_NAND) {
+			/* another col addr cycle for 2k page */
+			send_addr((column >> 8) & 0xF);
+		} else if (IS_4K_PAGE_NAND) {
+			/* another col addr cycle for 4k page */
+			send_addr((column >> 8) & 0x1F);
+		}
+	}
+	if (page_addr != -1) {
+		do {
+			send_addr(page_addr & 0xff);
+			page_mask >>= 8;
+			page_addr >>= 8;
+		} while (page_mask != 0);
+	}
+}
+
+
+/*
+ * Function to perform the address cycles.
+ */
+static void mxc_nand_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	if (info->auto_mode)
+		mxc_do_addr_cycle_auto(mtd, column, page_addr);
+	else
+		mxc_do_addr_cycle_atomic(mtd, column, page_addr);
+}
+
+/*!
+ * This function is used by the upper layer to write command to NAND Flash for
+ * different operations to be carried out on NAND Flash
+ *
+ * @param       mtd             MTD structure for the NAND Flash
+ * @param       command         command for NAND Flash
+ * @param       column          column offset for the page read
+ * @param       page_addr       page to be read from NAND Flash
+ */
+static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
+			     int column, int page_addr)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	DEBUG(MTD_DEBUG_LEVEL3,
+	      "mxc_nand_command (cmd = 0x%x, col = 0x%x, page = 0x%x)\n",
+	      command, column, page_addr);
+	/*
+	 * Reset command state information
+	 */
+	info->status_req = 0;
+
+	/*
+	 * Command pre-processing step
+	 */
+	switch (command) {
+	case NAND_CMD_STATUS:
+		info->col_addr = 0;
+		info->status_req = 1;
+		break;
+
+	case NAND_CMD_READ0:
+		info->col_addr = column;
+		break;
+
+	case NAND_CMD_READOOB:
+		info->col_addr = column;
+		command = NAND_CMD_READ0;
+		break;
+
+	case NAND_CMD_SEQIN:
+		if (column != 0) {
+
+			/* FIXME: before send SEQIN command for
+			 * partial write,We need read one page out.
+			 * FSL NFC does not support partial write
+			 * It alway send out 512+ecc+512+ecc ...
+			 * for large page nand flash. But for small
+			 * page nand flash, it did support SPARE
+			 * ONLY operation. But to make driver
+			 * simple. We take the same as large page,read
+			 * whole page out and update. As for MLC nand
+			 * NOP(num of operation) = 1. Partial written
+			 * on one programed page is not allowed! We
+			 * can't limit it on the driver, it need the
+			 * upper layer applicaiton take care it
+			 */
+
+			mxc_nand_command(mtd, NAND_CMD_READ0, 0, page_addr);
+		}
+
+		info->col_addr = column;
+		break;
+
+	case NAND_CMD_PAGEPROG:
+		if (!info->auto_mode) {
+			nfc_memcpy(MAIN_AREA0, info->data_buf, mtd->oobblock);
+			copy_spare(mtd, info->oob_buf, SPARE_AREA0,
+						mtd->oobsize, 0);
+		}
+
+		send_prog_page(mtd, 0);
+		break;
+
+	case NAND_CMD_ERASE1:
+	case NAND_CMD_ERASE2:
+		break;
+	}
+
+	/*
+	 * Write out the command to the device.
+	 */
+	send_cmd(mtd, command);
+
+	mxc_nand_addr_cycle(mtd, column, page_addr);
+
+	/*
+	 * Command post-processing step
+	 */
+	switch (command) {
+
+	case NAND_CMD_READOOB:
+	case NAND_CMD_READ0:
+		if (info->large_page)
+			/* send read confirm command */
+			send_cmd(mtd, NAND_CMD_READSTART);
+
+		send_read_page(mtd, 0);
+
+		if (!info->auto_mode) {
+			mxc_nand_ecc_status(mtd);
+			nfc_memcpy(info->data_buf, MAIN_AREA0, mtd->oobblock);
+			copy_spare(mtd, info->oob_buf, SPARE_AREA0,
+						mtd->oobsize, 1);
+		}
+		break;
+
+	case NAND_CMD_READID:
+		send_read_id();
+		info->col_addr = column;
+		nfc_memcpy(info->data_buf, MAIN_AREA0, 2048);
+		break;
+	}
+}
+
+/* Define some generic bad / good block scan pattern which are used
+ * while scanning a device for factory marked good / bad blocks. */
+static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
+
+static struct nand_bbt_descr smallpage_memorybased = {
+	.options = NAND_BBT_SCAN2NDPAGE,
+	.offs = 5,
+	.len = 1,
+	.pattern = scan_ff_pattern
+};
+
+static struct nand_bbt_descr largepage_memorybased = {
+	.options = 0,
+	.offs = 0,
+	.len = 2,
+	.pattern = scan_ff_pattern
+};
+
+/* Generic flash bbt decriptors
+*/
+static uint8_t bbt_pattern[] = { 'B', 'b', 't', '0' };
+static uint8_t mirror_pattern[] = { '1', 't', 'b', 'B' };
+
+static struct nand_bbt_descr bbt_main_descr = {
+	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+	    | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+	.offs = 0,
+	.len = 4,
+	.veroffs = 4,
+	.maxblocks = 4,
+	.pattern = bbt_pattern
+};
+
+static struct nand_bbt_descr bbt_mirror_descr = {
+	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+	    | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+	.offs = 0,
+	.len = 4,
+	.veroffs = 4,
+	.maxblocks = 4,
+	.pattern = mirror_pattern
+};
+
+static int mxc_nand_scan_bbt(struct mtd_info *mtd)
+{
+	struct nand_chip *this = mtd->priv;
+	struct nand_info *info = this->priv;
+
+	info->page_mask = this->pagemask;
+
+	if (IS_2K_PAGE_NAND) {
+		NFC_SET_NFMS(1 << NFMS_NF_PG_SZ);
+		this->autooob = &nand_hw_eccoob_2k;
+		info->large_page = 1;
+	} else if (IS_4K_PAGE_NAND) {
+		NFC_SET_NFMS(1 << NFMS_NF_PG_SZ);
+		this->autooob = &nand_hw_eccoob_4k;
+		info->large_page = 1;
+	} else {
+		this->autooob = &nand_hw_eccoob_512;
+		info->large_page = 0;
+	}
+
+	/* reconfig for interleave mode */
+
+	if (this->numchips > 1 && info->auto_mode) {
+		info->num_of_intlv = this->numchips;
+		this->numchips = 1;
+
+		/* FIXEME:need remove it
+		 * when kernel support
+		 * 4G larger space
+		 */
+		mtd->size = this->chipsize;
+		mtd->erasesize *= info->num_of_intlv;
+		mtd->oobblock *= info->num_of_intlv;
+		mtd->oobsize *= info->num_of_intlv;
+		this->page_shift = ffs(mtd->oobblock) - 1;
+		this->bbt_erase_shift =
+		this->phys_erase_shift = ffs(mtd->erasesize) - 1;
+		this->chip_shift = ffs(this->chipsize) - 1;
+		/*this->oob_poi = this->buffers->databuf + mtd->oobblock;*/
+	}
+
+	/* propagate ecc.layout to mtd_info */
+	memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
+
+	/* jffs2 not write oob */
+	/*mtd->flags &= ~MTD_OOB_WRITEABLE;*/
+
+	/* use flash based bbt */
+	this->bbt_td = &bbt_main_descr;
+	this->bbt_md = &bbt_mirror_descr;
+
+	/* update flash based bbt */
+	this->options |= NAND_USE_FLASH_BBT;
+
+	if (!this->badblock_pattern) {
+		this->badblock_pattern = (mtd->oobblock > 512) ?
+		    &largepage_memorybased : &smallpage_memorybased;
+	}
+
+	/* Build bad block table */
+	return nand_scan_bbt(mtd, this->badblock_pattern);
+}
+
+static void mxc_nfc_init(void)
+{
+	/* Disable interrupt */
+	raw_write((raw_read(REG_NFC_INTRRUPT) | NFC_INT_MSK), REG_NFC_INTRRUPT);
+
+	/* disable spare enable */
+	raw_write(raw_read(REG_NFC_SP_EN) & ~NFC_SP_EN, REG_NFC_SP_EN);
+
+	/* Unlock the internal RAM Buffer */
+	raw_write(NFC_SET_BLS(NFC_BLS_UNLCOKED), REG_NFC_BLS);
+
+	/* Blocks to be unlocked */
+	UNLOCK_ADDR(0x0, 0xFFFF);
+
+	/* Unlock Block Command for given address range */
+	raw_write(NFC_SET_WPC(NFC_WPC_UNLOCK), REG_NFC_WPC);
+}
+
+static int mxc_alloc_buf(struct nand_info *info)
+{
+	int err = 0;
+
+	info->data_buf = kmalloc(NAND_MAX_PAGESIZE, GFP_KERNEL);
+	if (!info->data_buf) {
+		printk(KERN_ERR "%s: failed to allocate data_buf\n", __func__);
+		err = -ENOMEM;
+		return err;
+	}
+	memset(info->data_buf, 0, NAND_MAX_PAGESIZE);
+
+	info->oob_buf = kmalloc(NAND_MAX_OOBSIZE, GFP_KERNEL);
+	if (!info->oob_buf) {
+		printk(KERN_ERR "%s: failed to allocate oob_buf\n", __func__);
+		err = -ENOMEM;
+		return err;
+	}
+	memset(info->oob_buf, 0, NAND_MAX_OOBSIZE);
+
+	return err;
+}
+
+static void mxc_free_buf(struct nand_info *info)
+{
+	kfree(info->data_buf);
+	kfree(info->oob_buf);
+}
+
+/*!
+ * This function is called during the driver binding process.
+ *
+ * @param   pdev  the device structure used to store device specific
+ *                information that is used by the suspend, resume and
+ *                remove functions
+ *
+ * @return  The function always returns 0.
+ */
+int board_nand_init(struct nand_chip *nand)
+{
+	struct nand_info *info;
+	struct nand_chip *this = nand;
+	int err;
+
+	info = kmalloc(sizeof(struct nand_info), GFP_KERNEL);
+	if (!info) {
+		printk(KERN_ERR "%s: failed to allocate nand_info\n",
+		       __func__);
+		err = -ENOMEM;
+		return err;
+	}
+	memset(info, 0, sizeof(struct nand_info));
+
+	if (mxc_alloc_buf(info)) {
+		err = -ENOMEM;
+		return err;
+	}
+
+	info->num_of_intlv = 1;
+
+#ifdef CONFIG_MXC_NFC_SP_AUTO
+	info->auto_mode = 1;
+#endif
+	/* init the nfc */
+	mxc_nfc_init();
+
+	this->priv = info;
+	this->cmdfunc = mxc_nand_command;
+	this->select_chip = mxc_nand_select_chip;
+	this->read_byte = mxc_nand_read_byte;
+	this->read_word = mxc_nand_read_word;
+	this->write_buf = mxc_nand_write_buf;
+	this->read_buf = mxc_nand_read_buf;
+	this->verify_buf = mxc_nand_verify_buf;
+	this->scan_bbt = mxc_nand_scan_bbt;
+	this->calculate_ecc = mxc_nand_calculate_ecc;
+	this->correct_data = mxc_nand_correct_data;
+	this->enable_hwecc = mxc_nand_enable_hwecc;
+	this->eccmode = NAND_ECC_HW3_512;
+	this->eccbytes = 9;
+	this->eccsize = 512;
+
+	return 0;
+
+}