nand_spl/nand_boot.c - u-boot - Git at Google

 /*
  * (C) Copyright 2006-2008
  * Stefan Roese, DENX Software Engineering, sr@denx.de.
  *
  * 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., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

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

 #define CONFIG_SYS_NAND_READ_DELAY \
 	{ volatile int dummy; int i; for (i=0; i<10000; i++) dummy = i; }

 static int nand_ecc_pos[] = CONFIG_SYS_NAND_ECCPOS;

 #if (CONFIG_SYS_NAND_PAGE_SIZE <= 512)
 /*
  * NAND command for small page NAND devices (512)
  */
 static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
 {
 	struct nand_chip *this = mtd->priv;
 	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;

 	if (this->dev_ready)
 		while (!this->dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;

 	/* Begin command latch cycle */
 	this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
 	/* Set ALE and clear CLE to start address cycle */
 	/* Column address */
 	this->cmd_ctrl(mtd, offs, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
 	this->cmd_ctrl(mtd, page_addr & 0xff, NAND_CTRL_ALE); /* A[16:9] */
 	this->cmd_ctrl(mtd, (page_addr >> 8) & 0xff,
 		       NAND_CTRL_ALE); /* A[24:17] */
 #ifdef CONFIG_SYS_NAND_4_ADDR_CYCLE
 	/* One more address cycle for devices > 32MiB */
 	this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
 		       NAND_CTRL_ALE); /* A[28:25] */
 #endif
 	/* Latch in address */
 	this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);

 	/*
 	 * Wait a while for the data to be ready
 	 */
 	if (this->dev_ready)
 		while (!this->dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;

 	return 0;
 }
 #else
 /*
  * NAND command for large page NAND devices (2k)
  */
 static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
 {
 	struct nand_chip *this = mtd->priv;
 	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;

 	if (this->dev_ready)
 		while (!this->dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;

 	/* Emulate NAND_CMD_READOOB */
 	if (cmd == NAND_CMD_READOOB) {
 		offs += CONFIG_SYS_NAND_PAGE_SIZE;
 		cmd = NAND_CMD_READ0;
 	}

 	/* Begin command latch cycle */
 	this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
 	/* Set ALE and clear CLE to start address cycle */
 	/* Column address */
 	this->cmd_ctrl(mtd, offs & 0xff,
 		       NAND_CTRL_ALE | NAND_CTRL_CHANGE); /* A[7:0] */
 	this->cmd_ctrl(mtd, (offs >> 8) & 0xff, NAND_CTRL_ALE); /* A[11:9] */
 	/* Row address */
 	this->cmd_ctrl(mtd, (page_addr & 0xff), NAND_CTRL_ALE); /* A[19:12] */
 	this->cmd_ctrl(mtd, ((page_addr >> 8) & 0xff),
 		       NAND_CTRL_ALE); /* A[27:20] */
 #ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
 	/* One more address cycle for devices > 128MiB */
 	this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
 		       NAND_CTRL_ALE); /* A[31:28] */
 #endif
 	/* Latch in address */
 	this->cmd_ctrl(mtd, NAND_CMD_READSTART,
 		       NAND_CTRL_CLE | NAND_CTRL_CHANGE);
 	this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);

 	/*
 	 * Wait a while for the data to be ready
 	 */
 	if (this->dev_ready)
 		while (!this->dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;

 	return 0;
 }
 #endif

 static int nand_is_bad_block(struct mtd_info *mtd, int block)
 {
 	struct nand_chip *this = mtd->priv;

 	nand_command(mtd, block, 0, CONFIG_SYS_NAND_BAD_BLOCK_POS, NAND_CMD_READOOB);

 	/*
 	 * Read one byte
 	 */
 	if (readb(this->IO_ADDR_R) != 0xff)
 		return 1;

 	return 0;
 }

 static int nand_read_page(struct mtd_info *mtd, int block, int page, uchar *dst)
 {
 	struct nand_chip *this = mtd->priv;
 	u_char *ecc_calc;
 	u_char *ecc_code;
 	u_char *oob_data;
 	int i;
 	int eccsize = CONFIG_SYS_NAND_ECCSIZE;
 	int eccbytes = CONFIG_SYS_NAND_ECCBYTES;
 	int eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
 	uint8_t *p = dst;
 	int stat;

 	nand_command(mtd, block, page, 0, NAND_CMD_READ0);

 	/* No malloc available for now, just use some temporary locations
 	 * in SDRAM
 	 */
 	ecc_calc = (u_char *)(CONFIG_SYS_SDRAM_BASE + 0x10000);
 	ecc_code = ecc_calc + 0x100;
 	oob_data = ecc_calc + 0x200;

 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		this->ecc.hwctl(mtd, NAND_ECC_READ);
 		this->read_buf(mtd, p, eccsize);
 		this->ecc.calculate(mtd, p, &ecc_calc[i]);
 	}
 	this->read_buf(mtd, oob_data, CONFIG_SYS_NAND_OOBSIZE);

 	/* Pick the ECC bytes out of the oob data */
 	for (i = 0; i < CONFIG_SYS_NAND_ECCTOTAL; i++)
 		ecc_code[i] = oob_data[nand_ecc_pos[i]];

 	eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
 	p = dst;

 	for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		/* No chance to do something with the possible error message
 		 * from correct_data(). We just hope that all possible errors
 		 * are corrected by this routine.
 		 */
 		stat = this->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
 	}

 	return 0;
 }

 static int nand_load(struct mtd_info *mtd, unsigned int offs,
 		     unsigned int uboot_size, uchar *dst)
 {
 	unsigned int block, lastblock;
 	unsigned int page;

 	/*
 	 * offs has to be aligned to a page address!
 	 */
 	block = offs / CONFIG_SYS_NAND_BLOCK_SIZE;
 	lastblock = (offs + uboot_size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE;
 	page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE;

 	while (block <= lastblock) {
 		if (!nand_is_bad_block(mtd, block)) {
 			/*
 			 * Skip bad blocks
 			 */
 			while (page < CONFIG_SYS_NAND_PAGE_COUNT) {
 				nand_read_page(mtd, block, page, dst);
 				dst += CONFIG_SYS_NAND_PAGE_SIZE;
 				page++;
 			}

 			page = 0;
 		} else {
 			lastblock++;
 		}

 		block++;
 	}

 	return 0;
 }

 /*
  * The main entry for NAND booting. It's necessary that SDRAM is already
  * configured and available since this code loads the main U-Boot image
  * from NAND into SDRAM and starts it from there.
  */
 void nand_boot(void)
 {
 	struct nand_chip nand_chip;
 	nand_info_t nand_info;
 	int ret;
 	__attribute__((noreturn)) void (*uboot)(void);

 	/*
 	 * Init board specific nand support
 	 */
 	nand_info.priv = &nand_chip;
 	nand_chip.IO_ADDR_R = nand_chip.IO_ADDR_W = (void  __iomem *)CONFIG_SYS_NAND_BASE;
 	nand_chip.dev_ready = NULL;	/* preset to NULL */
 	board_nand_init(&nand_chip);

 	if (nand_chip.select_chip)
 		nand_chip.select_chip(&nand_info, 0);

 	/*
 	 * Load U-Boot image from NAND into RAM
 	 */
 	ret = nand_load(&nand_info, CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
 			(uchar *)CONFIG_SYS_NAND_U_BOOT_DST);

 #ifdef CONFIG_NAND_ENV_DST
 	nand_load(&nand_info, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
 		  (uchar *)CONFIG_NAND_ENV_DST);

 #ifdef CONFIG_ENV_OFFSET_REDUND
 	nand_load(&nand_info, CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
 		  (uchar *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
 #endif
 #endif

 	if (nand_chip.select_chip)
 		nand_chip.select_chip(&nand_info, -1);

 	/*
 	 * Jump to U-Boot image
 	 */
 	uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 	(*uboot)();
 }
	/*
	* (C) Copyright 2006-2008
	* Stefan Roese, DENX Software Engineering, sr@denx.de.
	*
	* 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., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

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

	#define CONFIG_SYS_NAND_READ_DELAY \
	{ volatile int dummy; int i; for (i=0; i<10000; i++) dummy = i; }

	static int nand_ecc_pos[] = CONFIG_SYS_NAND_ECCPOS;

	#if (CONFIG_SYS_NAND_PAGE_SIZE <= 512)
	/*
	* NAND command for small page NAND devices (512)
	*/
	static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
	{
	struct nand_chip *this = mtd->priv;
	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;

	if (this->dev_ready)
	while (!this->dev_ready(mtd))
	;
	else
	CONFIG_SYS_NAND_READ_DELAY;

	/* Begin command latch cycle */
	this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE \| NAND_CTRL_CHANGE);
	/* Set ALE and clear CLE to start address cycle */
	/* Column address */
	this->cmd_ctrl(mtd, offs, NAND_CTRL_ALE \| NAND_CTRL_CHANGE);
	this->cmd_ctrl(mtd, page_addr & 0xff, NAND_CTRL_ALE); /* A[16:9] */
	this->cmd_ctrl(mtd, (page_addr >> 8) & 0xff,
	NAND_CTRL_ALE); /* A[24:17] */
	#ifdef CONFIG_SYS_NAND_4_ADDR_CYCLE
	/* One more address cycle for devices > 32MiB */
	this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
	NAND_CTRL_ALE); /* A[28:25] */
	#endif
	/* Latch in address */
	this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE \| NAND_CTRL_CHANGE);

	/*
	* Wait a while for the data to be ready
	*/
	if (this->dev_ready)
	while (!this->dev_ready(mtd))
	;
	else
	CONFIG_SYS_NAND_READ_DELAY;

	return 0;
	}
	#else
	/*
	* NAND command for large page NAND devices (2k)
	*/
	static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
	{
	struct nand_chip *this = mtd->priv;
	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;

	if (this->dev_ready)
	while (!this->dev_ready(mtd))
	;
	else
	CONFIG_SYS_NAND_READ_DELAY;

	/* Emulate NAND_CMD_READOOB */
	if (cmd == NAND_CMD_READOOB) {
	offs += CONFIG_SYS_NAND_PAGE_SIZE;
	cmd = NAND_CMD_READ0;
	}

	/* Begin command latch cycle */
	this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE \| NAND_CTRL_CHANGE);
	/* Set ALE and clear CLE to start address cycle */
	/* Column address */
	this->cmd_ctrl(mtd, offs & 0xff,
	NAND_CTRL_ALE \| NAND_CTRL_CHANGE); /* A[7:0] */
	this->cmd_ctrl(mtd, (offs >> 8) & 0xff, NAND_CTRL_ALE); /* A[11:9] */
	/* Row address */
	this->cmd_ctrl(mtd, (page_addr & 0xff), NAND_CTRL_ALE); /* A[19:12] */
	this->cmd_ctrl(mtd, ((page_addr >> 8) & 0xff),
	NAND_CTRL_ALE); /* A[27:20] */
	#ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
	/* One more address cycle for devices > 128MiB */
	this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
	NAND_CTRL_ALE); /* A[31:28] */
	#endif
	/* Latch in address */
	this->cmd_ctrl(mtd, NAND_CMD_READSTART,
	NAND_CTRL_CLE \| NAND_CTRL_CHANGE);
	this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE \| NAND_CTRL_CHANGE);

	/*
	* Wait a while for the data to be ready
	*/
	if (this->dev_ready)
	while (!this->dev_ready(mtd))
	;
	else
	CONFIG_SYS_NAND_READ_DELAY;

	return 0;
	}
	#endif

	static int nand_is_bad_block(struct mtd_info *mtd, int block)
	{
	struct nand_chip *this = mtd->priv;

	nand_command(mtd, block, 0, CONFIG_SYS_NAND_BAD_BLOCK_POS, NAND_CMD_READOOB);

	/*
	* Read one byte
	*/
	if (readb(this->IO_ADDR_R) != 0xff)
	return 1;

	return 0;
	}

	static int nand_read_page(struct mtd_info mtd, int block, int page, uchar dst)
	{
	struct nand_chip *this = mtd->priv;
	u_char *ecc_calc;
	u_char *ecc_code;
	u_char *oob_data;
	int i;
	int eccsize = CONFIG_SYS_NAND_ECCSIZE;
	int eccbytes = CONFIG_SYS_NAND_ECCBYTES;
	int eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
	uint8_t *p = dst;
	int stat;

	nand_command(mtd, block, page, 0, NAND_CMD_READ0);

	/* No malloc available for now, just use some temporary locations
	* in SDRAM
	*/
	ecc_calc = (u_char *)(CONFIG_SYS_SDRAM_BASE + 0x10000);
	ecc_code = ecc_calc + 0x100;
	oob_data = ecc_calc + 0x200;

	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
	this->ecc.hwctl(mtd, NAND_ECC_READ);
	this->read_buf(mtd, p, eccsize);
	this->ecc.calculate(mtd, p, &ecc_calc[i]);
	}
	this->read_buf(mtd, oob_data, CONFIG_SYS_NAND_OOBSIZE);

	/* Pick the ECC bytes out of the oob data */
	for (i = 0; i < CONFIG_SYS_NAND_ECCTOTAL; i++)
	ecc_code[i] = oob_data[nand_ecc_pos[i]];

	eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
	p = dst;

	for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
	/* No chance to do something with the possible error message
	* from correct_data(). We just hope that all possible errors
	* are corrected by this routine.
	*/
	stat = this->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
	}

	return 0;
	}

	static int nand_load(struct mtd_info *mtd, unsigned int offs,
	unsigned int uboot_size, uchar *dst)
	{
	unsigned int block, lastblock;
	unsigned int page;

	/*
	* offs has to be aligned to a page address!
	*/
	block = offs / CONFIG_SYS_NAND_BLOCK_SIZE;
	lastblock = (offs + uboot_size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE;
	page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE;

	while (block <= lastblock) {
	if (!nand_is_bad_block(mtd, block)) {
	/*
	* Skip bad blocks
	*/
	while (page < CONFIG_SYS_NAND_PAGE_COUNT) {
	nand_read_page(mtd, block, page, dst);
	dst += CONFIG_SYS_NAND_PAGE_SIZE;
	page++;
	}

	page = 0;
	} else {
	lastblock++;
	}

	block++;
	}

	return 0;
	}

	/*
	* The main entry for NAND booting. It's necessary that SDRAM is already
	* configured and available since this code loads the main U-Boot image
	* from NAND into SDRAM and starts it from there.
	*/
	void nand_boot(void)
	{
	struct nand_chip nand_chip;
	nand_info_t nand_info;
	int ret;
	__attribute__((noreturn)) void (*uboot)(void);

	/*
	* Init board specific nand support
	*/
	nand_info.priv = &nand_chip;
	nand_chip.IO_ADDR_R = nand_chip.IO_ADDR_W = (void __iomem *)CONFIG_SYS_NAND_BASE;
	nand_chip.dev_ready = NULL; /* preset to NULL */
	board_nand_init(&nand_chip);

	if (nand_chip.select_chip)
	nand_chip.select_chip(&nand_info, 0);

	/*
	* Load U-Boot image from NAND into RAM
	*/
	ret = nand_load(&nand_info, CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
	(uchar *)CONFIG_SYS_NAND_U_BOOT_DST);

	#ifdef CONFIG_NAND_ENV_DST
	nand_load(&nand_info, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
	(uchar *)CONFIG_NAND_ENV_DST);

	#ifdef CONFIG_ENV_OFFSET_REDUND
	nand_load(&nand_info, CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
	(uchar *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
	#endif
	#endif

	if (nand_chip.select_chip)
	nand_chip.select_chip(&nand_info, -1);

	/*
	* Jump to U-Boot image
	*/
	uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
	(*uboot)();
	}