[people/ms/u-boot.git] / cpu / arm926ejs / davinci / nand.c

/*
 * NAND driver for TI DaVinci based boards.
 *
 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
 *
 * Based on Linux DaVinci NAND driver by TI. Original copyright follows:
 */

/*
 *
 * linux/drivers/mtd/nand/nand_davinci.c
 *
 * NAND Flash Driver
 *
 * Copyright (C) 2006 Texas Instruments.
 *
 * ----------------------------------------------------------------------------
 *
 * 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * ----------------------------------------------------------------------------
 *
 *  Overview:
 *   This is a device driver for the NAND flash device found on the
 *   DaVinci board which utilizes the Samsung k9k2g08 part.
 *
 Modifications:
 ver. 1.0: Feb 2005, Vinod/Sudhakar
 -
 *
 */

#include <common.h>
#include <asm/io.h>

#ifdef CFG_USE_NAND
#if !defined(CFG_NAND_LEGACY)

#include <nand.h>
#include <asm/arch/nand_defs.h>
#include <asm/arch/emif_defs.h>

extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];

static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
	struct		nand_chip *this = mtd->priv;
	u_int32_t	IO_ADDR_W = (u_int32_t)this->IO_ADDR_W;

	IO_ADDR_W &= ~(MASK_ALE|MASK_CLE);

	if (ctrl & NAND_CTRL_CHANGE) {
		if ( ctrl & NAND_CLE )
			IO_ADDR_W |= MASK_CLE;
		if ( ctrl & NAND_ALE )
			IO_ADDR_W |= MASK_ALE;
		this->IO_ADDR_W = (void __iomem *) IO_ADDR_W;
	}

    if (cmd != NAND_CMD_NONE)
		writeb(cmd, this->IO_ADDR_W);
}

/* Set WP on deselect, write enable on select */
static void nand_davinci_select_chip(struct mtd_info *mtd, int chip)
{
#define GPIO_SET_DATA01	0x01c67018
#define GPIO_CLR_DATA01	0x01c6701c
#define GPIO_NAND_WP	(1 << 4)
#ifdef SONATA_BOARD_GPIOWP
	if (chip < 0) {
		REG(GPIO_CLR_DATA01) |= GPIO_NAND_WP;
	} else {
		REG(GPIO_SET_DATA01) |= GPIO_NAND_WP;
	}
#endif
}

#ifdef CFG_NAND_HW_ECC
#ifdef CFG_NAND_LARGEPAGE
static struct nand_oobinfo davinci_nand_oobinfo = {
	.useecc = MTD_NANDECC_AUTOPLACE,
	.eccbytes = 12,
	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
	.oobfree = { {2, 6}, {12, 12}, {28, 12}, {44, 12}, {60, 4} }
};
#elif defined(CFG_NAND_SMALLPAGE)
static struct nand_oobinfo davinci_nand_oobinfo = {
	.useecc = MTD_NANDECC_AUTOPLACE,
	.eccbytes = 3,
	.eccpos = {0, 1, 2},
	.oobfree = { {6, 2}, {8, 8} }
};
#else
#error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
#endif

static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode)
{
	emifregs	emif_addr;
	int		dummy;

	emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;

	dummy = emif_addr->NANDF1ECC;
	dummy = emif_addr->NANDF2ECC;
	dummy = emif_addr->NANDF3ECC;
	dummy = emif_addr->NANDF4ECC;

	emif_addr->NANDFCR |= (1 << 8);
}

static u_int32_t nand_davinci_readecc(struct mtd_info *mtd, u_int32_t region)
{
	u_int32_t	ecc = 0;
	emifregs	emif_base_addr;

	emif_base_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;

	if (region == 1)
		ecc = emif_base_addr->NANDF1ECC;
	else if (region == 2)
		ecc = emif_base_addr->NANDF2ECC;
	else if (region == 3)
		ecc = emif_base_addr->NANDF3ECC;
	else if (region == 4)
		ecc = emif_base_addr->NANDF4ECC;

	return(ecc);
}

static int nand_davinci_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
{
	u_int32_t		tmp;
	int			region, n;
	struct nand_chip	*this = mtd->priv;

	n = (this->ecc.size/512);

	region = 1;
	while (n--) {
		tmp = nand_davinci_readecc(mtd, region);
		*ecc_code++ = tmp;
		*ecc_code++ = tmp >> 16;
		*ecc_code++ = ((tmp >> 8) & 0x0f) | ((tmp >> 20) & 0xf0);
		region++;
	}
	return(0);
}

static void nand_davinci_gen_true_ecc(u_int8_t *ecc_buf)
{
	u_int32_t	tmp = ecc_buf[0] | (ecc_buf[1] << 16) | ((ecc_buf[2] & 0xf0) << 20) | ((ecc_buf[2] & 0x0f) << 8);

	ecc_buf[0] = ~(P64o(tmp) | P64e(tmp) | P32o(tmp) | P32e(tmp) | P16o(tmp) | P16e(tmp) | P8o(tmp) | P8e(tmp));
	ecc_buf[1] = ~(P1024o(tmp) | P1024e(tmp) | P512o(tmp) | P512e(tmp) | P256o(tmp) | P256e(tmp) | P128o(tmp) | P128e(tmp));
	ecc_buf[2] = ~( P4o(tmp) | P4e(tmp) | P2o(tmp) | P2e(tmp) | P1o(tmp) | P1e(tmp) | P2048o(tmp) | P2048e(tmp));
}

static int nand_davinci_compare_ecc(u_int8_t *ecc_nand, u_int8_t *ecc_calc, u_int8_t *page_data)
{
	u_int32_t	i;
	u_int8_t	tmp0_bit[8], tmp1_bit[8], tmp2_bit[8];
	u_int8_t	comp0_bit[8], comp1_bit[8], comp2_bit[8];
	u_int8_t	ecc_bit[24];
	u_int8_t	ecc_sum = 0;
	u_int8_t	find_bit = 0;
	u_int32_t	find_byte = 0;
	int		is_ecc_ff;

	is_ecc_ff = ((*ecc_nand == 0xff) && (*(ecc_nand + 1) == 0xff) && (*(ecc_nand + 2) == 0xff));

	nand_davinci_gen_true_ecc(ecc_nand);
	nand_davinci_gen_true_ecc(ecc_calc);

	for (i = 0; i <= 2; i++) {
		*(ecc_nand + i) = ~(*(ecc_nand + i));
		*(ecc_calc + i) = ~(*(ecc_calc + i));
	}

	for (i = 0; i < 8; i++) {
		tmp0_bit[i] = *ecc_nand % 2;
		*ecc_nand = *ecc_nand / 2;
	}

	for (i = 0; i < 8; i++) {
		tmp1_bit[i] = *(ecc_nand + 1) % 2;
		*(ecc_nand + 1) = *(ecc_nand + 1) / 2;
	}

	for (i = 0; i < 8; i++) {
		tmp2_bit[i] = *(ecc_nand + 2) % 2;
		*(ecc_nand + 2) = *(ecc_nand + 2) / 2;
	}

	for (i = 0; i < 8; i++) {
		comp0_bit[i] = *ecc_calc % 2;
		*ecc_calc = *ecc_calc / 2;
	}

	for (i = 0; i < 8; i++) {
		comp1_bit[i] = *(ecc_calc + 1) % 2;
		*(ecc_calc + 1) = *(ecc_calc + 1) / 2;
	}

	for (i = 0; i < 8; i++) {
		comp2_bit[i] = *(ecc_calc + 2) % 2;
		*(ecc_calc + 2) = *(ecc_calc + 2) / 2;
	}

	for (i = 0; i< 6; i++)
		ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2];

	for (i = 0; i < 8; i++)
		ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i];

	for (i = 0; i < 8; i++)
		ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i];

	ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0];
	ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1];

	for (i = 0; i < 24; i++)
		ecc_sum += ecc_bit[i];

	switch (ecc_sum) {
		case 0:
			/* Not reached because this function is not called if
			   ECC values are equal */
			return 0;
		case 1:
			/* Uncorrectable error */
			MTDDEBUG (MTD_DEBUG_LEVEL0,
			          "ECC UNCORRECTED_ERROR 1\n");
			return(-1);
		case 12:
			/* Correctable error */
			find_byte = (ecc_bit[23] << 8) +
				(ecc_bit[21] << 7) +
				(ecc_bit[19] << 6) +
				(ecc_bit[17] << 5) +
				(ecc_bit[15] << 4) +
				(ecc_bit[13] << 3) +
				(ecc_bit[11] << 2) +
				(ecc_bit[9]  << 1) +
				ecc_bit[7];

			find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1];

			MTDDEBUG (MTD_DEBUG_LEVEL0, "Correcting single bit ECC "
			          "error at offset: %d, bit: %d\n",
			          find_byte, find_bit);

			page_data[find_byte] ^= (1 << find_bit);

			return(0);
		default:
			if (is_ecc_ff) {
				if (ecc_calc[0] == 0 && ecc_calc[1] == 0 && ecc_calc[2] == 0)
					return(0);
			}
			MTDDEBUG (MTD_DEBUG_LEVEL0,
			          "UNCORRECTED_ERROR default\n");
			return(-1);
	}
}

static int nand_davinci_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
{
	struct nand_chip	*this;
	int			block_count = 0, i, rc;

	this = mtd->priv;
	block_count = (this->ecc.size/512);
	for (i = 0; i < block_count; i++) {
		if (memcmp(read_ecc, calc_ecc, 3) != 0) {
			rc = nand_davinci_compare_ecc(read_ecc, calc_ecc, dat);
			if (rc < 0) {
				return(rc);
			}
		}
		read_ecc += 3;
		calc_ecc += 3;
		dat += 512;
	}
	return(0);
}
#endif

static int nand_davinci_dev_ready(struct mtd_info *mtd)
{
	emifregs	emif_addr;

	emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;

	return(emif_addr->NANDFSR & 0x1);
}

static int nand_davinci_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
{
	while(!nand_davinci_dev_ready(mtd)) {;}
	*NAND_CE0CLE = NAND_STATUS;
	return(*NAND_CE0DATA);
}

static void nand_flash_init(void)
{
	u_int32_t	acfg1 = 0x3ffffffc;
	u_int32_t	acfg2 = 0x3ffffffc;
	u_int32_t	acfg3 = 0x3ffffffc;
	u_int32_t	acfg4 = 0x3ffffffc;
	emifregs	emif_regs;

	/*------------------------------------------------------------------*
	 *  NAND FLASH CHIP TIMEOUT @ 459 MHz                               *
	 *                                                                  *
	 *  AEMIF.CLK freq   = PLL1/6 = 459/6 = 76.5 MHz                    *
	 *  AEMIF.CLK period = 1/76.5 MHz = 13.1 ns                         *
	 *                                                                  *
	 *------------------------------------------------------------------*/
	 acfg1 = 0
		| (0 << 31 )	/* selectStrobe */
		| (0 << 30 )	/* extWait */
		| (1 << 26 )	/* writeSetup	10 ns */
		| (3 << 20 )	/* writeStrobe	40 ns */
		| (1 << 17 )	/* writeHold	10 ns */
		| (1 << 13 )	/* readSetup	10 ns */
		| (5 << 7 )	/* readStrobe	60 ns */
		| (1 << 4 )	/* readHold	10 ns */
		| (3 << 2 )	/* turnAround	?? ns */
		| (0 << 0 )	/* asyncSize	8-bit bus */
		;

	emif_regs = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;

	emif_regs->AWCCR |= 0x10000000;
	emif_regs->AB1CR = acfg1;	/* 0x08244128 */;
	emif_regs->AB2CR = acfg2;
	emif_regs->AB3CR = acfg3;
	emif_regs->AB4CR = acfg4;
	emif_regs->NANDFCR = 0x00000101;
}

int board_nand_init(struct nand_chip *nand)
{
	nand->IO_ADDR_R   = (void  __iomem *)NAND_CE0DATA;
	nand->IO_ADDR_W   = (void  __iomem *)NAND_CE0DATA;
	nand->chip_delay  = 0;
	nand->select_chip = nand_davinci_select_chip;
#ifdef CFG_NAND_USE_FLASH_BBT
	nand->options	  = NAND_USE_FLASH_BBT;
#endif
#ifdef CFG_NAND_HW_ECC
#ifdef CFG_NAND_LARGEPAGE
	nand->ecc.mode     = NAND_ECC_HW;
    nand->ecc.size = 2048;
    nand->ecc.bytes = 12;
#elif defined(CFG_NAND_SMALLPAGE)
	nand->ecc.mode     = NAND_ECC_HW;
    nand->ecc.size = 512;
    nand->ecc.bytes = 3;
#else
#error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
#endif
//	nand->autooob	  = &davinci_nand_oobinfo;
	nand->ecc.calculate = nand_davinci_calculate_ecc;
	nand->ecc.correct  = nand_davinci_correct_data;
	nand->ecc.hwctl  = nand_davinci_enable_hwecc;	
#else
	nand->ecc.mode     = NAND_ECC_SOFT;
#endif

	/* Set address of hardware control function */
	nand->cmd_ctrl = nand_davinci_hwcontrol;

	nand->dev_ready = nand_davinci_dev_ready;
	nand->waitfunc = nand_davinci_waitfunc;

	nand_flash_init();

	return(0);
}

#else
#error "U-Boot legacy NAND support not available for DaVinci chips"
#endif
#endif	/* CFG_USE_NAND */
Commit	Line	Data
c74b2108 SK	1	/*
	2	* NAND driver for TI DaVinci based boards.
	3	*
	4	* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
	5	*
	6	* Based on Linux DaVinci NAND driver by TI. Original copyright follows:
	7	*/
	8
	9	/*
	10	*
	11	* linux/drivers/mtd/nand/nand_davinci.c
	12	*
	13	* NAND Flash Driver
	14	*
	15	* Copyright (C) 2006 Texas Instruments.
	16	*
	17	* ----------------------------------------------------------------------------
	18	*
	19	* This program is free software; you can redistribute it and/or modify
	20	* it under the terms of the GNU General Public License as published by
	21	* the Free Software Foundation; either version 2 of the License, or
	22	* (at your option) any later version.
	23	*
	24	* This program is distributed in the hope that it will be useful,
	25	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	26	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	27	* GNU General Public License for more details.
	28	*
	29	* You should have received a copy of the GNU General Public License
	30	* along with this program; if not, write to the Free Software
	31	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	32	* ----------------------------------------------------------------------------
	33	*
	34	* Overview:
	35	* This is a device driver for the NAND flash device found on the
	36	* DaVinci board which utilizes the Samsung k9k2g08 part.
	37	*
	38	Modifications:
	39	ver. 1.0: Feb 2005, Vinod/Sudhakar
	40	-
	41	*
	42	*/
	43
	44	#include <common.h>
cfa460ad	45	#include <asm/io.h>
c74b2108 SK	46
	47	#ifdef CFG_USE_NAND
	48	#if !defined(CFG_NAND_LEGACY)
	49
	50	#include <nand.h>
	51	#include <asm/arch/nand_defs.h>
	52	#include <asm/arch/emif_defs.h>
	53
	54	extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];
	55
cfa460ad	56	static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
c74b2108 SK	57	{
	58	struct nand_chip *this = mtd->priv;
	59	u_int32_t IO_ADDR_W = (u_int32_t)this->IO_ADDR_W;
	60
	61	IO_ADDR_W &= ~(MASK_ALE\|MASK_CLE);
	62
cfa460ad WJ	63	if (ctrl & NAND_CTRL_CHANGE) {
cfa460ad WJ	64	if ( ctrl & NAND_CLE )
c74b2108	65	IO_ADDR_W \|= MASK_CLE;
cfa460ad	66	if ( ctrl & NAND_ALE )
c74b2108	67	IO_ADDR_W \|= MASK_ALE;
cfa460ad	68	this->IO_ADDR_W = (void __iomem *) IO_ADDR_W;
c74b2108 SK	69	}
c74b2108 SK	70
cfa460ad WJ	71	if (cmd != NAND_CMD_NONE)
cfa460ad WJ	72	writeb(cmd, this->IO_ADDR_W);
c74b2108 SK	73	}
	74
	75	/* Set WP on deselect, write enable on select */
	76	static void nand_davinci_select_chip(struct mtd_info *mtd, int chip)
	77	{
	78	#define GPIO_SET_DATA01 0x01c67018
	79	#define GPIO_CLR_DATA01 0x01c6701c
	80	#define GPIO_NAND_WP (1 << 4)
	81	#ifdef SONATA_BOARD_GPIOWP
	82	if (chip < 0) {
	83	REG(GPIO_CLR_DATA01) \|= GPIO_NAND_WP;
	84	} else {
	85	REG(GPIO_SET_DATA01) \|= GPIO_NAND_WP;
	86	}
	87	#endif
	88	}
	89
	90	#ifdef CFG_NAND_HW_ECC
	91	#ifdef CFG_NAND_LARGEPAGE
	92	static struct nand_oobinfo davinci_nand_oobinfo = {
	93	.useecc = MTD_NANDECC_AUTOPLACE,
	94	.eccbytes = 12,
	95	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
	96	.oobfree = { {2, 6}, {12, 12}, {28, 12}, {44, 12}, {60, 4} }
	97	};
	98	#elif defined(CFG_NAND_SMALLPAGE)
	99	static struct nand_oobinfo davinci_nand_oobinfo = {
	100	.useecc = MTD_NANDECC_AUTOPLACE,
	101	.eccbytes = 3,
	102	.eccpos = {0, 1, 2},
	103	.oobfree = { {6, 2}, {8, 8} }
	104	};
	105	#else
	106	#error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
	107	#endif
	108
	109	static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode)
	110	{
	111	emifregs emif_addr;
	112	int dummy;
	113
	114	emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
	115
	116	dummy = emif_addr->NANDF1ECC;
	117	dummy = emif_addr->NANDF2ECC;
	118	dummy = emif_addr->NANDF3ECC;
	119	dummy = emif_addr->NANDF4ECC;
	120
950a3924	121	emif_addr->NANDFCR \|= (1 << 8);
c74b2108 SK	122	}
	123
	124	static u_int32_t nand_davinci_readecc(struct mtd_info *mtd, u_int32_t region)
	125	{
	126	u_int32_t ecc = 0;
	127	emifregs emif_base_addr;
	128
	129	emif_base_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
	130
	131	if (region == 1)
	132	ecc = emif_base_addr->NANDF1ECC;
	133	else if (region == 2)
	134	ecc = emif_base_addr->NANDF2ECC;
	135	else if (region == 3)
	136	ecc = emif_base_addr->NANDF3ECC;
	137	else if (region == 4)
	138	ecc = emif_base_addr->NANDF4ECC;
	139
	140	return(ecc);
	141	}
	142
	143	static int nand_davinci_calculate_ecc(struct mtd_info mtd, const u_char dat, u_char *ecc_code)
	144	{
	145	u_int32_t tmp;
	146	int region, n;
	147	struct nand_chip *this = mtd->priv;
	148
cfa460ad	149	n = (this->ecc.size/512);
c74b2108	150
950a3924	151	region = 1;
c74b2108 SK	152	while (n--) {
	153	tmp = nand_davinci_readecc(mtd, region);
	154	*ecc_code++ = tmp;
	155	*ecc_code++ = tmp >> 16;
	156	*ecc_code++ = ((tmp >> 8) & 0x0f) \| ((tmp >> 20) & 0xf0);
	157	region++;
	158	}
	159	return(0);
	160	}
	161
	162	static void nand_davinci_gen_true_ecc(u_int8_t *ecc_buf)
	163	{
	164	u_int32_t tmp = ecc_buf[0] \| (ecc_buf[1] << 16) \| ((ecc_buf[2] & 0xf0) << 20) \| ((ecc_buf[2] & 0x0f) << 8);
	165
	166	ecc_buf[0] = ~(P64o(tmp) \| P64e(tmp) \| P32o(tmp) \| P32e(tmp) \| P16o(tmp) \| P16e(tmp) \| P8o(tmp) \| P8e(tmp));
	167	ecc_buf[1] = ~(P1024o(tmp) \| P1024e(tmp) \| P512o(tmp) \| P512e(tmp) \| P256o(tmp) \| P256e(tmp) \| P128o(tmp) \| P128e(tmp));
	168	ecc_buf[2] = ~( P4o(tmp) \| P4e(tmp) \| P2o(tmp) \| P2e(tmp) \| P1o(tmp) \| P1e(tmp) \| P2048o(tmp) \| P2048e(tmp));
	169	}
	170
	171	static int nand_davinci_compare_ecc(u_int8_t ecc_nand, u_int8_t ecc_calc, u_int8_t *page_data)
	172	{
	173	u_int32_t i;
	174	u_int8_t tmp0_bit[8], tmp1_bit[8], tmp2_bit[8];
	175	u_int8_t comp0_bit[8], comp1_bit[8], comp2_bit[8];
	176	u_int8_t ecc_bit[24];
	177	u_int8_t ecc_sum = 0;
	178	u_int8_t find_bit = 0;
	179	u_int32_t find_byte = 0;
	180	int is_ecc_ff;
	181
	182	is_ecc_ff = ((ecc_nand == 0xff) && ((ecc_nand + 1) == 0xff) && (*(ecc_nand + 2) == 0xff));
	183
	184	nand_davinci_gen_true_ecc(ecc_nand);
	185	nand_davinci_gen_true_ecc(ecc_calc);
	186
	187	for (i = 0; i <= 2; i++) {
	188	(ecc_nand + i) = ~((ecc_nand + i));
	189	(ecc_calc + i) = ~((ecc_calc + i));
	190	}
	191
	192	for (i = 0; i < 8; i++) {
	193	tmp0_bit[i] = *ecc_nand % 2;
	194	ecc_nand = ecc_nand / 2;
	195	}
	196
	197	for (i = 0; i < 8; i++) {
	198	tmp1_bit[i] = *(ecc_nand + 1) % 2;
	199	(ecc_nand + 1) = (ecc_nand + 1) / 2;
	200	}
	201
	202	for (i = 0; i < 8; i++) {
	203	tmp2_bit[i] = *(ecc_nand + 2) % 2;
	204	(ecc_nand + 2) = (ecc_nand + 2) / 2;
	205	}
	206
	207	for (i = 0; i < 8; i++) {
	208	comp0_bit[i] = *ecc_calc % 2;
	209	ecc_calc = ecc_calc / 2;
	210	}
	211
	212	for (i = 0; i < 8; i++) {
	213	comp1_bit[i] = *(ecc_calc + 1) % 2;
	214	(ecc_calc + 1) = (ecc_calc + 1) / 2;
	215	}
216
217	for (i = 0; i < 8; i++) {
218	comp2_bit[i] = *(ecc_calc + 2) % 2;
219	(ecc_calc + 2) = (ecc_calc + 2) / 2;
220	}
221
222	for (i = 0; i< 6; i++)
223	ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2];
224
225	for (i = 0; i < 8; i++)
226	ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i];
227
228	for (i = 0; i < 8; i++)
229	ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i];
230
231	ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0];
232	ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1];
233
234	for (i = 0; i < 24; i++)
235	ecc_sum += ecc_bit[i];
236
237	switch (ecc_sum) {
238	case 0:
239	/* Not reached because this function is not called if
240	ECC values are equal */
241	return 0;
242	case 1:
243	/* Uncorrectable error */
3167c538 SW	244	MTDDEBUG (MTD_DEBUG_LEVEL0,
3167c538 SW	245	"ECC UNCORRECTED_ERROR 1\n");
c74b2108 SK	246	return(-1);
	247	case 12:
	248	/* Correctable error */
	249	find_byte = (ecc_bit[23] << 8) +
	250	(ecc_bit[21] << 7) +
	251	(ecc_bit[19] << 6) +
	252	(ecc_bit[17] << 5) +
	253	(ecc_bit[15] << 4) +
	254	(ecc_bit[13] << 3) +
	255	(ecc_bit[11] << 2) +
	256	(ecc_bit[9] << 1) +
	257	ecc_bit[7];
	258
	259	find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1];
	260
3167c538 SW	261	MTDDEBUG (MTD_DEBUG_LEVEL0, "Correcting single bit ECC "
	262	"error at offset: %d, bit: %d\n",
	263	find_byte, find_bit);
c74b2108 SK	264
	265	page_data[find_byte] ^= (1 << find_bit);
	266
	267	return(0);
	268	default:
	269	if (is_ecc_ff) {
	270	if (ecc_calc[0] == 0 && ecc_calc[1] == 0 && ecc_calc[2] == 0)
	271	return(0);
	272	}
3167c538 SW	273	MTDDEBUG (MTD_DEBUG_LEVEL0,
3167c538 SW	274	"UNCORRECTED_ERROR default\n");
c74b2108 SK	275	return(-1);
	276	}
	277	}
	278
	279	static int nand_davinci_correct_data(struct mtd_info mtd, u_char dat, u_char read_ecc, u_char calc_ecc)
	280	{
	281	struct nand_chip *this;
	282	int block_count = 0, i, rc;
	283
	284	this = mtd->priv;
cfa460ad	285	block_count = (this->ecc.size/512);
c74b2108 SK	286	for (i = 0; i < block_count; i++) {
	287	if (memcmp(read_ecc, calc_ecc, 3) != 0) {
	288	rc = nand_davinci_compare_ecc(read_ecc, calc_ecc, dat);
	289	if (rc < 0) {
	290	return(rc);
	291	}
	292	}
	293	read_ecc += 3;
	294	calc_ecc += 3;
	295	dat += 512;
	296	}
	297	return(0);
	298	}
	299	#endif
	300
	301	static int nand_davinci_dev_ready(struct mtd_info *mtd)
	302	{
	303	emifregs emif_addr;
	304
	305	emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
	306
	307	return(emif_addr->NANDFSR & 0x1);
	308	}
	309
cfa460ad	310	static int nand_davinci_waitfunc(struct mtd_info mtd, struct nand_chip this)
c74b2108 SK	311	{
	312	while(!nand_davinci_dev_ready(mtd)) {;}
	313	*NAND_CE0CLE = NAND_STATUS;
	314	return(*NAND_CE0DATA);
	315	}
	316
	317	static void nand_flash_init(void)
	318	{
950a3924 WD	319	u_int32_t acfg1 = 0x3ffffffc;
	320	u_int32_t acfg2 = 0x3ffffffc;
	321	u_int32_t acfg3 = 0x3ffffffc;
	322	u_int32_t acfg4 = 0x3ffffffc;
	323	emifregs emif_regs;
	324
	325	/------------------------------------------------------------------
	326	* NAND FLASH CHIP TIMEOUT @ 459 MHz *
	327	* *
	328	* AEMIF.CLK freq = PLL1/6 = 459/6 = 76.5 MHz *
	329	* AEMIF.CLK period = 1/76.5 MHz = 13.1 ns *
	330	* *
	331	------------------------------------------------------------------/
	332	acfg1 = 0
53677ef1 WD	333	\| (0 << 31 ) /* selectStrobe */
	334	\| (0 << 30 ) /* extWait */
	335	\| (1 << 26 ) /* writeSetup 10 ns */
	336	\| (3 << 20 ) /* writeStrobe 40 ns */
	337	\| (1 << 17 ) /* writeHold 10 ns */
	338	\| (1 << 13 ) /* readSetup 10 ns */
	339	\| (5 << 7 ) /* readStrobe 60 ns */
	340	\| (1 << 4 ) /* readHold 10 ns */
	341	\| (3 << 2 ) /* turnAround ?? ns */
	342	\| (0 << 0 ) /* asyncSize 8-bit bus */
	343	;
950a3924 WD	344
	345	emif_regs = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
	346
	347	emif_regs->AWCCR \|= 0x10000000;
	348	emif_regs->AB1CR = acfg1; /* 0x08244128 */;
	349	emif_regs->AB2CR = acfg2;
	350	emif_regs->AB3CR = acfg3;
	351	emif_regs->AB4CR = acfg4;
	352	emif_regs->NANDFCR = 0x00000101;
c74b2108 SK	353	}
	354
	355	int board_nand_init(struct nand_chip *nand)
	356	{
	357	nand->IO_ADDR_R = (void __iomem *)NAND_CE0DATA;
	358	nand->IO_ADDR_W = (void __iomem *)NAND_CE0DATA;
	359	nand->chip_delay = 0;
	360	nand->select_chip = nand_davinci_select_chip;
	361	#ifdef CFG_NAND_USE_FLASH_BBT
	362	nand->options = NAND_USE_FLASH_BBT;
	363	#endif
	364	#ifdef CFG_NAND_HW_ECC
	365	#ifdef CFG_NAND_LARGEPAGE
cfa460ad WJ	366	nand->ecc.mode = NAND_ECC_HW;
	367	nand->ecc.size = 2048;
	368	nand->ecc.bytes = 12;
c74b2108	369	#elif defined(CFG_NAND_SMALLPAGE)
cfa460ad WJ	370	nand->ecc.mode = NAND_ECC_HW;
	371	nand->ecc.size = 512;
	372	nand->ecc.bytes = 3;
c74b2108 SK	373	#else
	374	#error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
	375	#endif
cfa460ad WJ	376	// nand->autooob = &davinci_nand_oobinfo;
	377	nand->ecc.calculate = nand_davinci_calculate_ecc;
	378	nand->ecc.correct = nand_davinci_correct_data;
	379	nand->ecc.hwctl = nand_davinci_enable_hwecc;
c74b2108	380	#else
cfa460ad	381	nand->ecc.mode = NAND_ECC_SOFT;
c74b2108 SK	382	#endif
	383
	384	/* Set address of hardware control function */
cfa460ad	385	nand->cmd_ctrl = nand_davinci_hwcontrol;
c74b2108 SK	386
	387	nand->dev_ready = nand_davinci_dev_ready;
	388	nand->waitfunc = nand_davinci_waitfunc;
	389
	390	nand_flash_init();
	391
	392	return(0);
	393	}
	394
	395	#else
	396	#error "U-Boot legacy NAND support not available for DaVinci chips"
	397	#endif
	398	#endif /* CFG_USE_NAND */