u-boot/drivers/mtd/nand/lpc32xx_nand_slc.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

597 lines
18 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* LPC32xx SLC NAND flash controller driver
*
* (C) Copyright 2015 Vladimir Zapolskiy <vz@mleia.com>
*
* Hardware ECC support original source code
* Copyright (C) 2008 by NXP Semiconductors
* Author: Kevin Wells
*
* Copyright (c) 2015 Tyco Fire Protection Products.
*/
#include <common.h>
#include <nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/arch/config.h>
#include <asm/arch/clk.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/dma.h>
#include <asm/arch/cpu.h>
#if defined(CONFIG_DMA_LPC32XX) && defined(CONFIG_SPL_BUILD)
#warning "DMA support in SPL image is not tested"
#endif
struct lpc32xx_nand_slc_regs {
u32 data;
u32 addr;
u32 cmd;
u32 stop;
u32 ctrl;
u32 cfg;
u32 stat;
u32 int_stat;
u32 ien;
u32 isr;
u32 icr;
u32 tac;
u32 tc;
u32 ecc;
u32 dma_data;
};
/* CFG register */
#define CFG_CE_LOW (1 << 5)
#define CFG_DMA_ECC (1 << 4) /* Enable DMA ECC bit */
#define CFG_ECC_EN (1 << 3) /* ECC enable bit */
#define CFG_DMA_BURST (1 << 2) /* DMA burst bit */
#define CFG_DMA_DIR (1 << 1) /* DMA write(0)/read(1) bit */
/* CTRL register */
#define CTRL_SW_RESET (1 << 2)
#define CTRL_ECC_CLEAR (1 << 1) /* Reset ECC bit */
#define CTRL_DMA_START (1 << 0) /* Start DMA channel bit */
/* STAT register */
#define STAT_DMA_FIFO (1 << 2) /* DMA FIFO has data bit */
#define STAT_NAND_READY (1 << 0)
/* INT_STAT register */
#define INT_STAT_TC (1 << 1)
#define INT_STAT_RDY (1 << 0)
/* TAC register bits, be aware of overflows */
#define TAC_W_RDY(n) (max_t(uint32_t, (n), 0xF) << 28)
#define TAC_W_WIDTH(n) (max_t(uint32_t, (n), 0xF) << 24)
#define TAC_W_HOLD(n) (max_t(uint32_t, (n), 0xF) << 20)
#define TAC_W_SETUP(n) (max_t(uint32_t, (n), 0xF) << 16)
#define TAC_R_RDY(n) (max_t(uint32_t, (n), 0xF) << 12)
#define TAC_R_WIDTH(n) (max_t(uint32_t, (n), 0xF) << 8)
#define TAC_R_HOLD(n) (max_t(uint32_t, (n), 0xF) << 4)
#define TAC_R_SETUP(n) (max_t(uint32_t, (n), 0xF) << 0)
/* NAND ECC Layout for small page NAND devices
* Note: For large page devices, the default layouts are used. */
static struct nand_ecclayout lpc32xx_nand_oob_16 = {
.eccbytes = 6,
.eccpos = {10, 11, 12, 13, 14, 15},
.oobfree = {
{.offset = 0,
. length = 4},
{.offset = 6,
. length = 4}
}
};
#if defined(CONFIG_DMA_LPC32XX)
#define ECCSTEPS (CONFIG_SYS_NAND_PAGE_SIZE / CONFIG_SYS_NAND_ECCSIZE)
/*
* DMA Descriptors
* For Large Block: 17 descriptors = ((16 Data and ECC Read) + 1 Spare Area)
* For Small Block: 5 descriptors = ((4 Data and ECC Read) + 1 Spare Area)
*/
static struct lpc32xx_dmac_ll dmalist[ECCSTEPS * 2 + 1];
static u32 ecc_buffer[8]; /* MAX ECC size */
static unsigned int dmachan = (unsigned int)-1; /* Invalid channel */
/*
* Helper macro for the DMA client (i.e. NAND SLC):
* - to write the next DMA linked list item address
* (see arch/include/asm/arch-lpc32xx/dma.h).
* - to assign the DMA data register to DMA source or destination address.
* - to assign the ECC register to DMA source or destination address.
*/
#define lpc32xx_dmac_next_lli(x) ((u32)x)
#define lpc32xx_dmac_set_dma_data() ((u32)&lpc32xx_nand_slc_regs->dma_data)
#define lpc32xx_dmac_set_ecc() ((u32)&lpc32xx_nand_slc_regs->ecc)
#endif
static struct lpc32xx_nand_slc_regs __iomem *lpc32xx_nand_slc_regs
= (struct lpc32xx_nand_slc_regs __iomem *)SLC_NAND_BASE;
static void lpc32xx_nand_init(void)
{
uint32_t hclk = get_hclk_clk_rate();
/* Reset SLC NAND controller */
writel(CTRL_SW_RESET, &lpc32xx_nand_slc_regs->ctrl);
/* 8-bit bus, no DMA, no ECC, ordinary CE signal */
writel(0, &lpc32xx_nand_slc_regs->cfg);
/* Interrupts disabled and cleared */
writel(0, &lpc32xx_nand_slc_regs->ien);
writel(INT_STAT_TC | INT_STAT_RDY,
&lpc32xx_nand_slc_regs->icr);
/* Configure NAND flash timings */
writel(TAC_W_RDY(CONFIG_LPC32XX_NAND_SLC_WDR_CLKS) |
TAC_W_WIDTH(hclk / CONFIG_LPC32XX_NAND_SLC_WWIDTH) |
TAC_W_HOLD(hclk / CONFIG_LPC32XX_NAND_SLC_WHOLD) |
TAC_W_SETUP(hclk / CONFIG_LPC32XX_NAND_SLC_WSETUP) |
TAC_R_RDY(CONFIG_LPC32XX_NAND_SLC_RDR_CLKS) |
TAC_R_WIDTH(hclk / CONFIG_LPC32XX_NAND_SLC_RWIDTH) |
TAC_R_HOLD(hclk / CONFIG_LPC32XX_NAND_SLC_RHOLD) |
TAC_R_SETUP(hclk / CONFIG_LPC32XX_NAND_SLC_RSETUP),
&lpc32xx_nand_slc_regs->tac);
}
static void lpc32xx_nand_cmd_ctrl(struct mtd_info *mtd,
int cmd, unsigned int ctrl)
{
debug("ctrl: 0x%08x, cmd: 0x%08x\n", ctrl, cmd);
if (ctrl & NAND_NCE)
setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_CE_LOW);
else
clrbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_CE_LOW);
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
writel(cmd & 0xFF, &lpc32xx_nand_slc_regs->cmd);
else if (ctrl & NAND_ALE)
writel(cmd & 0xFF, &lpc32xx_nand_slc_regs->addr);
}
static int lpc32xx_nand_dev_ready(struct mtd_info *mtd)
{
return readl(&lpc32xx_nand_slc_regs->stat) & STAT_NAND_READY;
}
#if defined(CONFIG_DMA_LPC32XX)
/*
* Prepares DMA descriptors for NAND RD/WR operations
* If the size is < 256 Bytes then it is assumed to be
* an OOB transfer
*/
static void lpc32xx_nand_dma_configure(struct nand_chip *chip,
const u8 *buffer, int size,
int read)
{
u32 i, dmasrc, ctrl, ecc_ctrl, oob_ctrl, dmadst;
struct lpc32xx_dmac_ll *dmalist_cur;
struct lpc32xx_dmac_ll *dmalist_cur_ecc;
/*
* CTRL descriptor entry for reading ECC
* Copy Multiple times to sync DMA with Flash Controller
*/
ecc_ctrl = 0x5 |
DMAC_CHAN_SRC_BURST_1 |
DMAC_CHAN_DEST_BURST_1 |
DMAC_CHAN_SRC_WIDTH_32 |
DMAC_CHAN_DEST_WIDTH_32 |
DMAC_CHAN_DEST_AHB1;
/* CTRL descriptor entry for reading/writing Data */
ctrl = (CONFIG_SYS_NAND_ECCSIZE / 4) |
DMAC_CHAN_SRC_BURST_4 |
DMAC_CHAN_DEST_BURST_4 |
DMAC_CHAN_SRC_WIDTH_32 |
DMAC_CHAN_DEST_WIDTH_32 |
DMAC_CHAN_DEST_AHB1;
/* CTRL descriptor entry for reading/writing Spare Area */
oob_ctrl = (CONFIG_SYS_NAND_OOBSIZE / 4) |
DMAC_CHAN_SRC_BURST_4 |
DMAC_CHAN_DEST_BURST_4 |
DMAC_CHAN_SRC_WIDTH_32 |
DMAC_CHAN_DEST_WIDTH_32 |
DMAC_CHAN_DEST_AHB1;
if (read) {
dmasrc = lpc32xx_dmac_set_dma_data();
dmadst = (u32)buffer;
ctrl |= DMAC_CHAN_DEST_AUTOINC;
} else {
dmadst = lpc32xx_dmac_set_dma_data();
dmasrc = (u32)buffer;
ctrl |= DMAC_CHAN_SRC_AUTOINC;
}
/*
* Write Operation Sequence for Small Block NAND
* ----------------------------------------------------------
* 1. X'fer 256 bytes of data from Memory to Flash.
* 2. Copy generated ECC data from Register to Spare Area
* 3. X'fer next 256 bytes of data from Memory to Flash.
* 4. Copy generated ECC data from Register to Spare Area.
* 5. X'fer 16 byets of Spare area from Memory to Flash.
* Read Operation Sequence for Small Block NAND
* ----------------------------------------------------------
* 1. X'fer 256 bytes of data from Flash to Memory.
* 2. Copy generated ECC data from Register to ECC calc Buffer.
* 3. X'fer next 256 bytes of data from Flash to Memory.
* 4. Copy generated ECC data from Register to ECC calc Buffer.
* 5. X'fer 16 bytes of Spare area from Flash to Memory.
* Write Operation Sequence for Large Block NAND
* ----------------------------------------------------------
* 1. Steps(1-4) of Write Operations repeate for four times
* which generates 16 DMA descriptors to X'fer 2048 bytes of
* data & 32 bytes of ECC data.
* 2. X'fer 64 bytes of Spare area from Memory to Flash.
* Read Operation Sequence for Large Block NAND
* ----------------------------------------------------------
* 1. Steps(1-4) of Read Operations repeate for four times
* which generates 16 DMA descriptors to X'fer 2048 bytes of
* data & 32 bytes of ECC data.
* 2. X'fer 64 bytes of Spare area from Flash to Memory.
*/
for (i = 0; i < size/CONFIG_SYS_NAND_ECCSIZE; i++) {
dmalist_cur = &dmalist[i * 2];
dmalist_cur_ecc = &dmalist[(i * 2) + 1];
dmalist_cur->dma_src = (read ? (dmasrc) : (dmasrc + (i*256)));
dmalist_cur->dma_dest = (read ? (dmadst + (i*256)) : dmadst);
dmalist_cur->next_lli = lpc32xx_dmac_next_lli(dmalist_cur_ecc);
dmalist_cur->next_ctrl = ctrl;
dmalist_cur_ecc->dma_src = lpc32xx_dmac_set_ecc();
dmalist_cur_ecc->dma_dest = (u32)&ecc_buffer[i];
dmalist_cur_ecc->next_lli =
lpc32xx_dmac_next_lli(&dmalist[(i * 2) + 2]);
dmalist_cur_ecc->next_ctrl = ecc_ctrl;
}
if (i) { /* Data only transfer */
dmalist_cur_ecc = &dmalist[(i * 2) - 1];
dmalist_cur_ecc->next_lli = 0;
dmalist_cur_ecc->next_ctrl |= DMAC_CHAN_INT_TC_EN;
return;
}
/* OOB only transfer */
if (read) {
dmasrc = lpc32xx_dmac_set_dma_data();
dmadst = (u32)buffer;
oob_ctrl |= DMAC_CHAN_DEST_AUTOINC;
} else {
dmadst = lpc32xx_dmac_set_dma_data();
dmasrc = (u32)buffer;
oob_ctrl |= DMAC_CHAN_SRC_AUTOINC;
}
/* Read/ Write Spare Area Data To/From Flash */
dmalist_cur = &dmalist[i * 2];
dmalist_cur->dma_src = dmasrc;
dmalist_cur->dma_dest = dmadst;
dmalist_cur->next_lli = 0;
dmalist_cur->next_ctrl = (oob_ctrl | DMAC_CHAN_INT_TC_EN);
}
static void lpc32xx_nand_xfer(struct mtd_info *mtd, const u8 *buf,
int len, int read)
{
struct nand_chip *chip = mtd_to_nand(mtd);
u32 config;
int ret;
/* DMA Channel Configuration */
config = (read ? DMAC_CHAN_FLOW_D_P2M : DMAC_CHAN_FLOW_D_M2P) |
(read ? DMAC_DEST_PERIP(0) : DMAC_DEST_PERIP(DMA_PERID_NAND1)) |
(read ? DMAC_SRC_PERIP(DMA_PERID_NAND1) : DMAC_SRC_PERIP(0)) |
DMAC_CHAN_ENABLE;
/* Prepare DMA descriptors */
lpc32xx_nand_dma_configure(chip, buf, len, read);
/* Setup SLC controller and start transfer */
if (read)
setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_DMA_DIR);
else /* NAND_ECC_WRITE */
clrbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_DMA_DIR);
setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_DMA_BURST);
/* Write length for new transfers */
if (!((readl(&lpc32xx_nand_slc_regs->stat) & STAT_DMA_FIFO) |
readl(&lpc32xx_nand_slc_regs->tc))) {
int tmp = (len != mtd->oobsize) ? mtd->oobsize : 0;
writel(len + tmp, &lpc32xx_nand_slc_regs->tc);
}
setbits_le32(&lpc32xx_nand_slc_regs->ctrl, CTRL_DMA_START);
/* Start DMA transfers */
ret = lpc32xx_dma_start_xfer(dmachan, dmalist, config);
if (unlikely(ret < 0))
BUG();
/* Wait for NAND to be ready */
while (!lpc32xx_nand_dev_ready(mtd))
;
/* Wait till DMA transfer is DONE */
if (lpc32xx_dma_wait_status(dmachan))
pr_err("NAND DMA transfer error!\r\n");
/* Stop DMA & HW ECC */
clrbits_le32(&lpc32xx_nand_slc_regs->ctrl, CTRL_DMA_START);
clrbits_le32(&lpc32xx_nand_slc_regs->cfg,
CFG_DMA_DIR | CFG_DMA_BURST | CFG_ECC_EN | CFG_DMA_ECC);
}
static u32 slc_ecc_copy_to_buffer(u8 *spare, const u32 *ecc, int count)
{
int i;
for (i = 0; i < (count * CONFIG_SYS_NAND_ECCBYTES);
i += CONFIG_SYS_NAND_ECCBYTES) {
u32 ce = ecc[i / CONFIG_SYS_NAND_ECCBYTES];
ce = ~(ce << 2) & 0xFFFFFF;
spare[i+2] = (u8)(ce & 0xFF); ce >>= 8;
spare[i+1] = (u8)(ce & 0xFF); ce >>= 8;
spare[i] = (u8)(ce & 0xFF);
}
return 0;
}
static int lpc32xx_ecc_calculate(struct mtd_info *mtd, const uint8_t *dat,
uint8_t *ecc_code)
{
return slc_ecc_copy_to_buffer(ecc_code, ecc_buffer, ECCSTEPS);
}
/*
* Enables and prepares SLC NAND controller
* for doing data transfers with H/W ECC enabled.
*/
static void lpc32xx_hwecc_enable(struct mtd_info *mtd, int mode)
{
/* Clear ECC */
writel(CTRL_ECC_CLEAR, &lpc32xx_nand_slc_regs->ctrl);
/* Setup SLC controller for H/W ECC operations */
setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_ECC_EN | CFG_DMA_ECC);
}
/*
* lpc32xx_correct_data - [NAND Interface] Detect and correct bit error(s)
* mtd: MTD block structure
* dat: raw data read from the chip
* read_ecc: ECC from the chip
* calc_ecc: the ECC calculated from raw data
*
* Detect and correct a 1 bit error for 256 byte block
*/
int lpc32xx_correct_data(struct mtd_info *mtd, u_char *dat,
u_char *read_ecc, u_char *calc_ecc)
{
unsigned int i;
int ret1, ret2 = 0;
u_char *r = read_ecc;
u_char *c = calc_ecc;
u16 data_offset = 0;
for (i = 0 ; i < ECCSTEPS ; i++) {
r += CONFIG_SYS_NAND_ECCBYTES;
c += CONFIG_SYS_NAND_ECCBYTES;
data_offset += CONFIG_SYS_NAND_ECCSIZE;
ret1 = nand_correct_data(mtd, dat + data_offset, r, c);
if (ret1 < 0)
return -EBADMSG;
else
ret2 += ret1;
}
return ret2;
}
#endif
#if defined(CONFIG_DMA_LPC32XX)
static void lpc32xx_dma_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
lpc32xx_nand_xfer(mtd, buf, len, 1);
}
#else
static void lpc32xx_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
while (len-- > 0)
*buf++ = readl(&lpc32xx_nand_slc_regs->data);
}
#endif
static uint8_t lpc32xx_read_byte(struct mtd_info *mtd)
{
return readl(&lpc32xx_nand_slc_regs->data);
}
#if defined(CONFIG_DMA_LPC32XX)
static void lpc32xx_dma_write_buf(struct mtd_info *mtd, const uint8_t *buf,
int len)
{
lpc32xx_nand_xfer(mtd, buf, len, 0);
}
#else
static void lpc32xx_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
while (len-- > 0)
writel(*buf++, &lpc32xx_nand_slc_regs->data);
}
#endif
static void lpc32xx_write_byte(struct mtd_info *mtd, uint8_t byte)
{
writel(byte, &lpc32xx_nand_slc_regs->data);
}
#if defined(CONFIG_DMA_LPC32XX)
/* Reuse the logic from "nand_read_page_hwecc()" */
static int lpc32xx_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
{
int i;
int stat;
uint8_t *p = buf;
uint8_t *ecc_calc = chip->buffers->ecccalc;
uint8_t *ecc_code = chip->buffers->ecccode;
uint32_t *eccpos = chip->ecc.layout->eccpos;
unsigned int max_bitflips = 0;
/*
* As per the "LPC32x0 and LPC32x0/01 User manual" table 173 notes
* and section 9.7, the NAND SLC & DMA allowed single DMA transaction
* of a page size using DMA controller scatter/gather mode through
* linked list; the ECC read is done without any software intervention.
*/
lpc32xx_hwecc_enable(mtd, NAND_ECC_READ);
lpc32xx_dma_read_buf(mtd, p, chip->ecc.size * chip->ecc.steps);
lpc32xx_ecc_calculate(mtd, p, &ecc_calc[0]);
lpc32xx_dma_read_buf(mtd, chip->oob_poi, mtd->oobsize);
for (i = 0; i < chip->ecc.total; i++)
ecc_code[i] = chip->oob_poi[eccpos[i]];
stat = chip->ecc.correct(mtd, p, &ecc_code[0], &ecc_calc[0]);
if (stat < 0)
mtd->ecc_stats.failed++;
else {
mtd->ecc_stats.corrected += stat;
max_bitflips = max_t(unsigned int, max_bitflips, stat);
}
return max_bitflips;
}
/* Reuse the logic from "nand_write_page_hwecc()" */
static int lpc32xx_write_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip,
const uint8_t *buf, int oob_required,
int page)
{
int i;
uint8_t *ecc_calc = chip->buffers->ecccalc;
const uint8_t *p = buf;
uint32_t *eccpos = chip->ecc.layout->eccpos;
/*
* As per the "LPC32x0 and LPC32x0/01 User manual" table 173 notes
* and section 9.7, the NAND SLC & DMA allowed single DMA transaction
* of a page size using DMA controller scatter/gather mode through
* linked list; the ECC read is done without any software intervention.
*/
lpc32xx_hwecc_enable(mtd, NAND_ECC_WRITE);
lpc32xx_dma_write_buf(mtd, p, chip->ecc.size * chip->ecc.steps);
lpc32xx_ecc_calculate(mtd, p, &ecc_calc[0]);
for (i = 0; i < chip->ecc.total; i++)
chip->oob_poi[eccpos[i]] = ecc_calc[i];
lpc32xx_dma_write_buf(mtd, chip->oob_poi, mtd->oobsize);
return 0;
}
#endif
/*
* LPC32xx has only one SLC NAND controller, don't utilize
* CONFIG_SYS_NAND_SELF_INIT to be able to reuse this function
* both in SPL NAND and U-Boot images.
*/
int board_nand_init(struct nand_chip *lpc32xx_chip)
{
#if defined(CONFIG_DMA_LPC32XX)
int ret;
/* Acquire a channel for our use */
ret = lpc32xx_dma_get_channel();
if (unlikely(ret < 0)) {
pr_info("Unable to get free DMA channel for NAND transfers\n");
return -1;
}
dmachan = (unsigned int)ret;
#endif
lpc32xx_chip->cmd_ctrl = lpc32xx_nand_cmd_ctrl;
lpc32xx_chip->dev_ready = lpc32xx_nand_dev_ready;
/*
* The implementation of these functions is quite common, but
* they MUST be defined, because access to data register
* is strictly 32-bit aligned.
*/
lpc32xx_chip->read_byte = lpc32xx_read_byte;
lpc32xx_chip->write_byte = lpc32xx_write_byte;
#if defined(CONFIG_DMA_LPC32XX)
/* Hardware ECC calculation is supported when DMA driver is selected */
lpc32xx_chip->ecc.mode = NAND_ECC_HW;
lpc32xx_chip->read_buf = lpc32xx_dma_read_buf;
lpc32xx_chip->write_buf = lpc32xx_dma_write_buf;
lpc32xx_chip->ecc.calculate = lpc32xx_ecc_calculate;
lpc32xx_chip->ecc.correct = lpc32xx_correct_data;
lpc32xx_chip->ecc.hwctl = lpc32xx_hwecc_enable;
lpc32xx_chip->chip_delay = 2000;
lpc32xx_chip->ecc.read_page = lpc32xx_read_page_hwecc;
lpc32xx_chip->ecc.write_page = lpc32xx_write_page_hwecc;
lpc32xx_chip->options |= NAND_NO_SUBPAGE_WRITE;
#else
/*
* Hardware ECC calculation is not supported by the driver,
* because it requires DMA support, see LPC32x0 User Manual,
* note after SLC_ECC register description (UM10326, p.198)
*/
lpc32xx_chip->ecc.mode = NAND_ECC_SOFT;
/*
* The implementation of these functions is quite common, but
* they MUST be defined, because access to data register
* is strictly 32-bit aligned.
*/
lpc32xx_chip->read_buf = lpc32xx_read_buf;
lpc32xx_chip->write_buf = lpc32xx_write_buf;
#endif
/*
* These values are predefined
* for both small and large page NAND flash devices.
*/
lpc32xx_chip->ecc.size = CONFIG_SYS_NAND_ECCSIZE;
lpc32xx_chip->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;
lpc32xx_chip->ecc.strength = 1;
if (CONFIG_SYS_NAND_PAGE_SIZE != NAND_LARGE_BLOCK_PAGE_SIZE)
lpc32xx_chip->ecc.layout = &lpc32xx_nand_oob_16;
#if defined(CONFIG_SYS_NAND_USE_FLASH_BBT)
lpc32xx_chip->bbt_options |= NAND_BBT_USE_FLASH;
#endif
/* Initialize NAND interface */
lpc32xx_nand_init();
return 0;
}