[U-Boot] Subject: [PATCH 06/11 v1] ARM: OMAP3: Add memory and syslib common files, add NAND support

dirk.behme at googlemail.com dirk.behme at googlemail.com
Sun Sep 14 11:52:13 CEST 2008


Subject: [PATCH 06/11 v1] ARM: OMAP3: Add memory and syslib common files, add NAND support

From: Dirk Behme <dirk.behme at gmail.com>

Add memory and syslib common files, add NAND support

Signed-off-by: Dirk Behme <dirk.behme at gmail.com>

---
 common/cmd_nand.c            |   29 +++
 cpu/omap3/Makefile           |    2 
 cpu/omap3/mem.c              |  301 ++++++++++++++++++++++++++++++++
 cpu/omap3/nand.c             |  399 +++++++++++++++++++++++++++++++++++++++++++
 cpu/omap3/syslib.c           |   72 +++++++
 drivers/mtd/nand/nand_base.c |  145 +++++++++++++++
 examples/Makefile            |    6 
 7 files changed, 951 insertions(+), 3 deletions(-)

Index: u-boot_master/cpu/omap3/mem.c
===================================================================
--- /dev/null
+++ u-boot_master/cpu/omap3/mem.c
@@ -0,0 +1,301 @@
+/*
+ * (C) Copyright 2008
+ * Texas Instruments, <www.ti.com>
+ *
+ * Author :
+ *     Manikandan Pillai <mani.pillai at ti.com>
+ *
+ * Initial Code from:
+ *     Richard Woodruff <r-woodruff2 at ti.com>
+ *     Syed Mohammed Khasim <khasim at ti.com>
+ *
+ * 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 <asm/io.h>
+#include <asm/arch/bits.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/sys_proto.h>
+#include <command.h>
+
+/* Only One NAND allowed on board at a time.
+ * The GPMC CS Base for the same
+ */
+unsigned int boot_flash_base;
+unsigned int boot_flash_off;
+unsigned int boot_flash_sec;
+unsigned int boot_flash_type;
+volatile unsigned int boot_flash_env_addr;
+
+/* help common/env_flash.c */
+#ifdef ENV_IS_VARIABLE
+
+uchar(*boot_env_get_char_spec) (int index);
+int (*boot_env_init) (void);
+int (*boot_saveenv) (void);
+void (*boot_env_relocate_spec) (void);
+
+/* 16 bit NAND */
+uchar env_get_char_spec(int index);
+int env_init(void);
+int saveenv(void);
+void env_relocate_spec(void);
+extern char *env_name_spec;
+
+#if defined(CONFIG_CMD_NAND)
+u8 is_nand;
+#endif
+
+#if defined(CONFIG_CMD_ONENAND)
+u8 is_onenand;
+#endif
+
+#endif /* ENV_IS_VARIABLE */
+
+#if defined(CONFIG_CMD_NAND)
+static u32 gpmc_m_nand[GPMC_MAX_REG] = {
+	M_NAND_GPMC_CONFIG1,
+	M_NAND_GPMC_CONFIG2,
+	M_NAND_GPMC_CONFIG3,
+	M_NAND_GPMC_CONFIG4,
+	M_NAND_GPMC_CONFIG5,
+	M_NAND_GPMC_CONFIG6, 0
+};
+unsigned int nand_cs_base;
+#endif
+
+#if defined(CONFIG_CMD_ONENAND)
+static u32 gpmc_onenand[GPMC_MAX_REG] = {
+	ONENAND_GPMC_CONFIG1,
+	ONENAND_GPMC_CONFIG2,
+	ONENAND_GPMC_CONFIG3,
+	ONENAND_GPMC_CONFIG4,
+	ONENAND_GPMC_CONFIG5,
+	ONENAND_GPMC_CONFIG6, 0
+};
+unsigned int onenand_cs_base;
+
+#endif
+
+/**************************************************************************
+ * make_cs1_contiguous() - for es2 and above remap cs1 behind cs0 to allow
+ *  command line mem=xyz use all memory with out discontinuous support
+ *  compiled in.  Could do it at the ATAG, but there really is two banks...
+ * Called as part of 2nd phase DDR init.
+ **************************************************************************/
+void make_cs1_contiguous(void)
+{
+	u32 size, a_add_low, a_add_high;
+
+	size = get_sdr_cs_size(SDRC_CS0_OSET);
+	size /= SZ_32M;		        /* find size to offset CS1 */
+	a_add_high = (size & 3) << 8;	/* set up low field */
+	a_add_low = (size & 0x3C) >> 2;	/* set up high field */
+	__raw_writel((a_add_high | a_add_low), SDRC_CS_CFG);
+
+}
+
+/********************************************************
+ *  mem_ok() - test used to see if timings are correct
+ *             for a part. Helps in guessing which part
+ *             we are currently using.
+ *******************************************************/
+u32 mem_ok(void)
+{
+	u32 val1, val2, addr;
+	u32 pattern = 0x12345678;
+
+	addr = OMAP34XX_SDRC_CS0;
+
+	__raw_writel(0x0, addr + 0x400);  /* clear pos A */
+	__raw_writel(pattern, addr);	  /* pattern to pos B */
+	__raw_writel(0x0, addr + 4);	  /* remove pattern off the bus */
+	val1 = __raw_readl(addr + 0x400); /* get pos A value */
+	val2 = __raw_readl(addr);	  /* get val2 */
+
+	if ((val1 != 0) || (val2 != pattern))  /* see if pos A value changed */
+		return 0;
+	else
+		return 1;
+}
+
+/********************************************************
+ *  sdrc_init() - init the sdrc chip selects CS0 and CS1
+ *  - early init routines, called from flash or
+ *  SRAM.
+ *******************************************************/
+void sdrc_init(void)
+{
+	/* only init up first bank here */
+	do_sdrc_init(SDRC_CS0_OSET, EARLY_INIT);
+}
+
+/*************************************************************************
+ * do_sdrc_init(): initialize the SDRAM for use.
+ *  -code sets up SDRAM basic SDRC timings for CS0
+ *  -optimal settings can be placed here, or redone after i2c
+ *      inspection of board info
+ *
+ *  - code called ones in C-Stack only context for CS0 and a possible 2nd
+ *      time depending on memory configuration from stack+global context
+ **************************************************************************/
+
+void do_sdrc_init(u32 offset, u32 early)
+{
+
+	/* reset sdrc controller */
+	__raw_writel(SOFTRESET, SDRC_SYSCONFIG);
+	wait_on_value(BIT0, BIT0, SDRC_STATUS, 12000000);
+	__raw_writel(0, SDRC_SYSCONFIG);
+
+	/* setup sdrc to ball mux */
+	__raw_writel(SDP_SDRC_SHARING, SDRC_SHARING);
+
+	/* SDRC_MCFG0 register */
+	(*(unsigned int *) 0x6D000080) = 0x02584099; /* from Micron */
+
+	/* SDRC_RFR_CTRL0 register */
+	(*(unsigned int *) 0x6D0000a4) = 0x54601;    /* for 166M */
+
+	/* SDRC_ACTIM_CTRLA0 register */
+	(*(unsigned int *) 0x6D00009c) = 0xa29db4c6; /* for 166M */
+
+	/* SDRC_ACTIM_CTRLB0 register */
+	(*(unsigned int *) 0x6D0000a0) = 0x12214;    /* for 166M */
+
+	/* Disble Power Down of CKE cuz of 1 CKE on combo part */
+	(*(unsigned int *) 0x6D000070) = 0x00000081;
+
+	/* SDRC_Manual command register */
+	(*(unsigned int *) 0x6D0000a8) = 0x00000000; /* NOP command */
+	(*(unsigned int *) 0x6D0000a8) = 0x00000001; /* Precharge command */
+	(*(unsigned int *) 0x6D0000a8) = 0x00000002; /* Auto-refresh command */
+	(*(unsigned int *) 0x6D0000a8) = 0x00000002; /* Auto-refresh command */
+
+	/* SDRC MR0 register */
+	(*(int *) 0x6D000084) = 0x00000032;	/*  Burst length = 4 */
+	/* CAS latency = 3, Write Burst = Read Burst Serial Mode */
+
+	/* SDRC DLLA control register */
+	(*(unsigned int *) 0x6D000060) = 0x0000A;
+	sdelay(0x20000);
+}
+
+void enable_gpmc_config(u32 *gpmc_config, u32 gpmc_base, u32 base, u32 size)
+{
+	__raw_writel(0, GPMC_CONFIG7 + gpmc_base);
+	sdelay(1000);
+	/* Delay for settling */
+	__raw_writel(gpmc_config[0], GPMC_CONFIG1 + gpmc_base);
+	__raw_writel(gpmc_config[1], GPMC_CONFIG2 + gpmc_base);
+	__raw_writel(gpmc_config[2], GPMC_CONFIG3 + gpmc_base);
+	__raw_writel(gpmc_config[3], GPMC_CONFIG4 + gpmc_base);
+	__raw_writel(gpmc_config[4], GPMC_CONFIG5 + gpmc_base);
+	__raw_writel(gpmc_config[5], GPMC_CONFIG6 + gpmc_base);
+	/* Enable the config */
+	__raw_writel((((size & 0xF) << 8) | ((base >> 24) & 0x3F) |
+		      (1 << 6)), GPMC_CONFIG7 + gpmc_base);
+	sdelay(2000);
+}
+
+/*****************************************************
+ * gpmc_init(): init gpmc bus
+ * Init GPMC for x16, MuxMode (SDRAM in x32).
+ * This code can only be executed from SRAM or SDRAM.
+ *****************************************************/
+void gpmc_init(void)
+{
+	/* putting a blanket check on GPMC based on ZeBu for now */
+	u32 mux = 0, mwidth;
+	u32 *gpmc_config = NULL;
+	u32 gpmc_base = 0;
+	u32 base = 0;
+	u32 size = 0;
+	u32 f_off = CFG_MONITOR_LEN;
+	u32 f_sec = 0;
+	u32 config = 0;
+
+	mux = BIT9;
+	mwidth = get_gpmc0_width();
+
+	/* global settings */
+	__raw_writel(0x0, GPMC_IRQENABLE);	/* isr's sources masked */
+	__raw_writel(0, GPMC_TIMEOUT_CONTROL);	/* timeout disable */
+
+	config = __raw_readl(GPMC_CONFIG);
+	config &= (~0xf00);
+	__raw_writel(config, GPMC_CONFIG);
+
+	/* Disable the GPMC0 config set by ROM code
+	 * It conflicts with our MPDB (both at 0x08000000)
+	 */
+	__raw_writel(0, GPMC_CONFIG7 + GPMC_CONFIG_CS0);
+	sdelay(1000);
+
+#if defined(CONFIG_CMD_NAND)    /* CS 0 */
+	gpmc_config = gpmc_m_nand;
+#if defined(CONFIG_ENV_IS_IN_NAND)
+	gpmc_base = GPMC_CONFIG_CS0 + (0 * GPMC_CONFIG_WIDTH);
+#else
+	gpmc_base = GPMC_CONFIG_CS0 + (1 * GPMC_CONFIG_WIDTH);
+#endif
+	base = PISMO1_NAND_BASE;
+	size = PISMO1_NAND_SIZE;
+	enable_gpmc_config(gpmc_config, gpmc_base, base, size);
+	is_nand = 1;
+	nand_cs_base = gpmc_base;
+#if defined(CONFIG_ENV_IS_IN_NAND)
+	f_off = SMNAND_ENV_OFFSET;
+	f_sec = SZ_128K;
+	/* env setup */
+	boot_flash_base = base;
+	boot_flash_off = f_off;
+	boot_flash_sec = f_sec;
+	boot_flash_env_addr = f_off;
+#endif
+#endif
+
+#if defined(CONFIG_CMD_ONENAND)
+	gpmc_config = gpmc_onenand;
+#if defined(CONFIG_ENV_IS_IN_ONENAND)
+	gpmc_base = GPMC_CONFIG_CS0 + (0 * GPMC_CONFIG_WIDTH);
+#else
+	gpmc_base = GPMC_CONFIG_CS0 + (1 * GPMC_CONFIG_WIDTH);
+#endif
+	base = PISMO1_ONEN_BASE;
+	size = PISMO1_ONEN_SIZE;
+	enable_gpmc_config(gpmc_config, gpmc_base, base, size);
+	is_onenand = 1;
+	onenand_cs_base = gpmc_base;
+#if defined(CONFIG_ENV_IS_IN_ONENAND)
+	f_off = ONENAND_ENV_OFFSET;
+	f_sec = SZ_128K;
+	/* env setup */
+	boot_flash_base = base;
+	boot_flash_off = f_off;
+	boot_flash_sec = f_sec;
+	boot_flash_env_addr = f_off;
+#endif
+#endif
+
+#ifdef ENV_IS_VARIABLE
+	boot_env_get_char_spec = env_get_char_spec;
+	boot_env_init = env_init;
+	boot_saveenv = saveenv;
+	boot_env_relocate_spec = env_relocate_spec;
+#endif
+}
Index: u-boot_master/cpu/omap3/syslib.c
===================================================================
--- /dev/null
+++ u-boot_master/cpu/omap3/syslib.c
@@ -0,0 +1,72 @@
+/*
+ * (C) Copyright 2008
+ * Texas Instruments, <www.ti.com>
+ *
+ * Richard Woodruff <r-woodruff2 at ti.com>
+ * Syed Mohammed Khasim <khasim at ti.com>
+ *
+ * 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 <asm/io.h>
+#include <asm/arch/bits.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/clocks.h>
+#include <asm/arch/sys_proto.h>
+
+/************************************************************
+ * sdelay() - simple spin loop.  Will be constant time as
+ *  its generally used in bypass conditions only.  This
+ *  is necessary until timers are accessible.
+ *
+ *  not inline to increase chances its in cache when called
+ *************************************************************/
+void sdelay(unsigned long loops)
+{
+	__asm__ volatile ("1:\n" "subs %0, %1, #1\n"
+			  "bne 1b":"=r" (loops):"0"(loops));
+}
+
+/*****************************************************************
+ * sr32 - clear & set a value in a bit range for a 32 bit address
+ *****************************************************************/
+void sr32(u32 addr, u32 start_bit, u32 num_bits, u32 value)
+{
+	u32 tmp, msk = 0;
+	msk = 1 << num_bits;
+	--msk;
+	tmp = __raw_readl(addr) & ~(msk << start_bit);
+	tmp |= value << start_bit;
+	__raw_writel(tmp, addr);
+}
+
+/*********************************************************************
+ * wait_on_value() - common routine to allow waiting for changes in
+ *   volatile regs.
+ *********************************************************************/
+u32 wait_on_value(u32 read_bit_mask, u32 match_value, u32 read_addr, u32 bound)
+{
+	u32 i = 0, val;
+	do {
+		++i;
+		val = __raw_readl(read_addr) & read_bit_mask;
+		if (val == match_value)
+			return 1;
+		if (i == bound)
+			return 0;
+	} while (1);
+}
Index: u-boot_master/cpu/omap3/nand.c
===================================================================
--- /dev/null
+++ u-boot_master/cpu/omap3/nand.c
@@ -0,0 +1,399 @@
+/*
+ * (C) Copyright 2004-2008 Texas Instruments, <www.ti.com>
+ * Rohit Choraria <rohitkc at ti.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <asm/io.h>
+#include <asm/arch/mem.h>
+#include <linux/mtd/nand_ecc.h>
+
+#if defined(CONFIG_CMD_NAND)
+
+#include <nand.h>
+
+unsigned char cs;
+volatile unsigned long gpmc_cs_base_add;
+
+#define GPMC_BUF_EMPTY 0
+#define GPMC_BUF_FULL 1
+
+#define ECC_P1_128_E(val)    ((val)  & 0x000000FF)	/* Bit 0 to 7 */
+#define ECC_P512_2048_E(val) (((val) & 0x00000F00)>>8)	/* Bit 8 to 11 */
+#define ECC_P1_128_O(val)    (((val) & 0x00FF0000)>>16)	/* Bit 16 to Bit 23 */
+#define ECC_P512_2048_O(val) (((val) & 0x0F000000)>>24)	/* Bit 24 to Bit 27 */
+
+/*
+ * omap_nand_hwcontrol - Set the address pointers corretly for the
+ *			following address/data/command operation
+ */
+static void omap_nand_hwcontrol(struct mtd_info *mtd, int cmd,
+				unsigned int ctrl)
+{
+	register struct nand_chip *this = mtd->priv;
+
+	/* Point the IO_ADDR to DATA and ADDRESS registers instead
+	   of chip address */
+	switch (ctrl) {
+	case NAND_CTRL_CHANGE | NAND_CTRL_CLE:
+		this->IO_ADDR_W = (void *) gpmc_cs_base_add + GPMC_NAND_CMD;
+		this->IO_ADDR_R = (void *) gpmc_cs_base_add + GPMC_NAND_DAT;
+		break;
+	case NAND_CTRL_CHANGE | NAND_CTRL_ALE:
+		this->IO_ADDR_W = (void *) gpmc_cs_base_add + GPMC_NAND_ADR;
+		this->IO_ADDR_R = (void *) gpmc_cs_base_add + GPMC_NAND_DAT;
+		break;
+	case NAND_CTRL_CHANGE | NAND_NCE:
+		this->IO_ADDR_W = (void *) gpmc_cs_base_add + GPMC_NAND_DAT;
+		this->IO_ADDR_R = (void *) gpmc_cs_base_add + GPMC_NAND_DAT;
+		break;
+	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
+}
+
+/*
+ * omap_nand_wait - called primarily after a program/erase operation
+ *			so that we access NAND again only after the device
+ *			is ready again.
+ * @mtd:        MTD device structure
+ * @chip:	nand_chip structure
+ */
+static int omap_nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
+{
+	register struct nand_chip *this = mtd->priv;
+	int status = 0;
+
+	this->IO_ADDR_W = (void *) gpmc_cs_base_add + GPMC_NAND_CMD;
+	this->IO_ADDR_R = (void *) gpmc_cs_base_add + GPMC_NAND_DAT;
+	/* Send the status command and loop until the device is free */
+	while (!(status & 0x40)) {
+		__raw_writeb(NAND_CMD_STATUS & 0xFF, this->IO_ADDR_W);
+		status = __raw_readb(this->IO_ADDR_R);
+	}
+	return status;
+}
+
+#ifdef CFG_NAND_WIDTH_16
+/*
+ * omap_nand_write_buf16 - [DEFAULT] write buffer to chip
+ * @mtd:	MTD device structure
+ * @buf:	data buffer
+ * @len:	number of bytes to write
+ *
+ * Default write function for 16bit buswith
+ */
+static void omap_nand_write_buf(struct mtd_info *mtd, const u_char *buf,
+				int len)
+{
+	int i;
+	struct nand_chip *this = mtd->priv;
+	u16 *p = (u16 *) buf;
+	len >>= 1;
+
+	for (i = 0; i < len; i++) {
+		writew(p[i], this->IO_ADDR_W);
+		while (GPMC_BUF_EMPTY == (readl(GPMC_STATUS) & GPMC_BUF_FULL)) ;
+	}
+}
+
+/*
+ * nand_read_buf16 - [DEFAULT] read chip data into buffer
+ * @mtd:	MTD device structure
+ * @buf:	buffer to store date
+ * @len:	number of bytes to read
+ *
+ * Default read function for 16bit buswith
+ */
+static void omap_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+	int i;
+	struct nand_chip *this = mtd->priv;
+	u16 *p = (u16 *) buf;
+	len >>= 1;
+
+	for (i = 0; i < len; i++)
+		p[i] = readw(this->IO_ADDR_R);
+}
+
+#else
+/*
+ * omap_nand_write_buf -  write buffer to NAND controller
+ * @mtd:        MTD device structure
+ * @buf:        data buffer
+ * @len:        number of bytes to write
+ *
+ */
+static void omap_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
+				int len)
+{
+	int i;
+	int j = 0;
+	struct nand_chip *chip = mtd->priv;
+
+	for (i = 0; i < len; i++) {
+		writeb(buf[i], chip->IO_ADDR_W);
+		for (j = 0; j < 10; j++) ;
+	}
+
+}
+
+/*
+ * omap_nand_read_buf - read data from NAND controller into buffer
+ * @mtd:        MTD device structure
+ * @buf:        buffer to store date
+ * @len:        number of bytes to read
+ *
+ */
+static void omap_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+	int i;
+	int j = 0;
+	struct nand_chip *chip = mtd->priv;
+
+	for (i = 0; i < len; i++) {
+		buf[i] = readb(chip->IO_ADDR_R);
+		while (GPMC_BUF_EMPTY == (readl(GPMC_STATUS) & GPMC_BUF_FULL));
+	}
+}
+#endif /* CFG_NAND_WIDTH_16 */
+
+/*
+ * omap_hwecc_init - Initialize the Hardware ECC for NAND flash in
+ *                   GPMC controller
+ * @mtd:        MTD device structure
+ *
+ */
+static void omap_hwecc_init(struct nand_chip *chip)
+{
+	unsigned long val = 0x0;
+
+	/* Init ECC Control Register */
+	/* Clear all ECC  | Enable Reg1 */
+	val = ((0x00000001 << 8) | 0x00000001);
+	__raw_writel(val, GPMC_BASE + GPMC_ECC_CONTROL);
+	__raw_writel(0x3fcff000, GPMC_BASE + GPMC_ECC_SIZE_CONFIG);
+}
+
+/*
+ * omap_correct_data - Compares the ecc read from nand spare area with
+ *                     ECC registers values
+ *			and corrects one bit error if it has occured
+ * @mtd:		 MTD device structure
+ * @dat:		 page data
+ * @read_ecc:		 ecc read from nand flash
+ * @calc_ecc: 		 ecc read from ECC registers
+ */
+static int omap_correct_data(struct mtd_info *mtd, u_char *dat,
+			     u_char *read_ecc, u_char *calc_ecc)
+{
+	return 0;
+}
+
+/*
+ *  omap_calculate_ecc - Generate non-inverted ECC bytes.
+ *
+ *  Using noninverted ECC can be considered ugly since writing a blank
+ *  page ie. padding will clear the ECC bytes. This is no problem as
+ *  long nobody is trying to write data on the seemingly unused page.
+ *  Reading an erased page will produce an ECC mismatch between
+ *  generated and read ECC bytes that has to be dealt with separately.
+ *  @mtd:	MTD structure
+ *  @dat:	unused
+ *  @ecc_code:	ecc_code buffer
+ */
+static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
+			      u_char *ecc_code)
+{
+	unsigned long val = 0x0;
+	unsigned long reg;
+
+	/* Start Reading from HW ECC1_Result = 0x200 */
+	reg = (unsigned long) (GPMC_BASE + GPMC_ECC1_RESULT);
+	val = __raw_readl(reg);
+
+	*ecc_code++ = ECC_P1_128_E(val);
+	*ecc_code++ = ECC_P1_128_O(val);
+	*ecc_code++ = ECC_P512_2048_E(val) | ECC_P512_2048_O(val) << 4;
+
+	return 0;
+}
+
+/*
+ * omap_enable_ecc - This function enables the hardware ecc functionality
+ * @mtd:        MTD device structure
+ * @mode:       Read/Write mode
+ */
+static void omap_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+	struct nand_chip *chip = mtd->priv;
+	unsigned int val = __raw_readl(GPMC_BASE + GPMC_ECC_CONFIG);
+	unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) >> 1;
+
+	switch (mode) {
+	case NAND_ECC_READ:
+		__raw_writel(0x101, GPMC_BASE + GPMC_ECC_CONTROL);
+		/* ECC col width | CS | ECC Enable */
+		val = (dev_width << 7) | (cs << 1) | (0x1);
+		break;
+	case NAND_ECC_READSYN:
+		__raw_writel(0x100, GPMC_BASE + GPMC_ECC_CONTROL);
+		/* ECC col width | CS | ECC Enable */
+		val = (dev_width << 7) | (cs << 1) | (0x1);
+		break;
+	case NAND_ECC_WRITE:
+		__raw_writel(0x101, GPMC_BASE + GPMC_ECC_CONTROL);
+		/* ECC col width | CS | ECC Enable */
+		val = (dev_width << 7) | (cs << 1) | (0x1);
+		break;
+	default:
+		printf("Error: Unrecognized Mode[%d]!\n", mode);
+		break;
+	}
+
+	__raw_writel(val, GPMC_BASE + GPMC_ECC_CONFIG);
+}
+
+static struct nand_ecclayout hw_nand_oob_64 = {
+	.eccbytes = 12,
+	.eccpos = {
+		   2, 3, 4, 5,
+		   6, 7, 8, 9,
+		   10, 11, 12, 13},
+	.oobfree = { {20, 50} }	/* don't care */
+};
+
+static struct nand_ecclayout sw_nand_oob_64 = {
+	.eccbytes = 24,
+	.eccpos = {
+		   40, 41, 42, 43, 44, 45, 46, 47,
+		   48, 49, 50, 51, 52, 53, 54, 55,
+		   56, 57, 58, 59, 60, 61, 62, 63},
+	.oobfree = { {2, 38} }
+};
+
+void omap_nand_switch_ecc(struct mtd_info *mtd, int hardware)
+{
+	struct nand_chip *nand = mtd->priv;
+
+	if (!hardware) {
+		nand->ecc.mode = NAND_ECC_SOFT;
+		nand->ecc.layout = &sw_nand_oob_64;
+		nand->ecc.size = 256;	/* set default eccsize */
+		nand->ecc.bytes = 3;
+		nand->ecc.steps = 8;
+		nand->ecc.hwctl = 0;
+		nand->ecc.calculate = nand_calculate_ecc;
+		nand->ecc.correct = nand_correct_data;
+	} else {
+		nand->ecc.mode = NAND_ECC_HW;
+		nand->ecc.layout = &hw_nand_oob_64;
+		nand->ecc.size = 512;
+		nand->ecc.bytes = 3;
+		nand->ecc.steps = 4;
+		nand->ecc.hwctl = omap_enable_hwecc;
+		nand->ecc.correct = omap_correct_data;
+		nand->ecc.calculate = omap_calculate_ecc;
+		omap_hwecc_init(nand);
+	}
+	nand_switch_ecc(mtd);
+
+	if (nand->options & NAND_BUSWIDTH_16) {
+		mtd->oobavail = mtd->oobsize - (nand->ecc.layout->eccbytes + 2);
+		if (nand->ecc.layout->eccbytes & 0x01)
+			mtd->oobavail--;
+	} else
+		mtd->oobavail = mtd->oobsize - (nand->ecc.layout->eccbytes + 1);
+}
+
+/*
+ * Board-specific NAND initialization. The following members of the
+ * argument are board-specific (per include/linux/mtd/nand_new.h):
+ * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
+ * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
+ * - hwcontrol: hardwarespecific function for accesing control-lines
+ * - dev_ready: hardwarespecific function for  accesing device ready/busy line
+ * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
+ *   only be provided if a hardware ECC is available
+ * - eccmode: mode of ecc, see defines
+ * - chip_delay: chip dependent delay for transfering data from array to
+ *   read regs (tR)
+ * - options: various chip options. They can partly be set to inform
+ *   nand_scan about special functionality. See the defines for further
+ *   explanation
+ * Members with a "?" were not set in the merged testing-NAND branch,
+ * so they are not set here either.
+ */
+int board_nand_init(struct nand_chip *nand)
+{
+	int gpmc_config = 0;
+	cs = 0;
+	while (cs <= GPMC_MAX_CS) {
+		/* Each GPMC set for a single CS is at offset 0x30 */
+		/* already remapped for us */
+		gpmc_cs_base_add = (GPMC_CONFIG_CS0 + (cs * 0x30));
+		/* xloader/Uboot would have written the NAND type for us
+		 * NOTE: This is a temporary measure and cannot handle ONENAND.
+		 * The proper way of doing this is to pass the setup of
+		 * u-boot up to kernel using kernel params - something on
+		 * the lines of machineID
+		 */
+		/* Check if NAND type is set */
+		if ((__raw_readl(gpmc_cs_base_add + GPMC_CONFIG1) & 0xC00) ==
+		    0x800) {
+			/* Found it!! */
+			break;
+		}
+		cs++;
+	}
+	if (cs > GPMC_MAX_CS) {
+		printf("NAND: Unable to find NAND settings in " \
+		       "GPMC Configuration - quitting\n");
+	}
+
+	gpmc_config = __raw_readl(GPMC_CONFIG);
+	/* Disable Write protect */
+	gpmc_config |= 0x10;
+	__raw_writel(gpmc_config, GPMC_CONFIG);
+
+	nand->IO_ADDR_R = (int *) gpmc_cs_base_add + GPMC_NAND_DAT;
+	nand->IO_ADDR_W = (int *) gpmc_cs_base_add + GPMC_NAND_CMD;
+
+	nand->cmd_ctrl = omap_nand_hwcontrol;
+	nand->options = NAND_NO_PADDING | NAND_CACHEPRG | NAND_NO_AUTOINCR |
+			NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR;
+	nand->read_buf = omap_nand_read_buf;
+	nand->write_buf = omap_nand_write_buf;
+	nand->ecc.mode = NAND_ECC_SOFT;
+	/* if RDY/BSY line is connected to OMAP then use the omap ready
+	 * function and the generic nand_wait function which reads the
+	 * status register after monitoring the RDY/BSY line. Otherwise
+	 * use a standard chip delay which is slightly more than tR
+	 * (AC Timing) of the NAND device and read the status register
+	 * until you get a failure or success
+	 */
+	nand->waitfunc = omap_nand_wait;
+	nand->chip_delay = 50;
+
+	return 0;
+}
+#endif /* CONFIG_CMD_NAND */
Index: u-boot_master/cpu/omap3/Makefile
===================================================================
--- u-boot_master.orig/cpu/omap3/Makefile
+++ u-boot_master/cpu/omap3/Makefile
@@ -27,7 +27,7 @@ LIB	= lib$(CPU).a
 
 START	:= start.o
 SOBJS	:= lowlevel_init.o
-OBJS	:= sys_info.o board.o clock.o cpu.o interrupts.o
+OBJS	:= sys_info.o board.o clock.o cpu.o interrupts.o mem.o syslib.o nand.o
 
 all:	.depend $(START) $(LIB)
 
Index: u-boot_master/examples/Makefile
===================================================================
--- u-boot_master.orig/examples/Makefile
+++ u-boot_master/examples/Makefile
@@ -30,10 +30,12 @@ LOAD_ADDR = 0x40000
 endif
 
 ifeq ($(ARCH),arm)
+LOAD_ADDR = 0xc100000
 ifeq ($(BOARD),omap2420h4)
 LOAD_ADDR = 0x80300000
-else
-LOAD_ADDR = 0xc100000
+endif
+ifeq ($(CPU),omap3)
+LOAD_ADDR = 0x80300000
 endif
 endif
 
Index: u-boot_master/common/cmd_nand.c
===================================================================
--- u-boot_master.orig/common/cmd_nand.c
+++ u-boot_master/common/cmd_nand.c
@@ -38,6 +38,11 @@ int find_dev_and_part(const char *id, st
 		      u8 *part_num, struct part_info **part);
 #endif
 
+#if defined(CONFIG_OMAP) && (defined(CONFIG_OMAP3_BEAGLE)\
+	|| defined(CONFIG_OMAP3_EVM) || defined(CONFIG_OVERO))
+extern void omap_nand_switch_ecc(nand_info_t *nand, int hardware);
+#endif
+
 static int nand_dump(nand_info_t *nand, ulong off, int only_oob)
 {
 	int i;
@@ -234,6 +239,10 @@ int do_nand(cmd_tbl_t * cmdtp, int flag,
 	    strncmp(cmd, "read", 4) != 0 && strncmp(cmd, "write", 5) != 0 &&
 	    strcmp(cmd, "scrub") != 0 && strcmp(cmd, "markbad") != 0 &&
 	    strcmp(cmd, "biterr") != 0 &&
+#if defined(CONFIG_OMAP) && (defined(CONFIG_OMAP3_BEAGLE)\
+	|| defined(CONFIG_OMAP3_EVM) || defined(CONFIG_OVERO))
+	    strncmp(cmd, "ecc", 3) != 0 &&
+#endif
 	    strcmp(cmd, "lock") != 0 && strcmp(cmd, "unlock") != 0 )
 		goto usage;
 
@@ -318,6 +327,22 @@ int do_nand(cmd_tbl_t * cmdtp, int flag,
 
 	}
 
+#if defined(CONFIG_OMAP) && (defined(CONFIG_OMAP3_BEAGLE) \
+	|| defined(CONFIG_OMAP3_EVM) || defined(CONFIG_OVERO))
+	if (strncmp(cmd, "ecc", 3) == 0) {
+		if (argc < 2)
+			goto usage;
+		if (strncmp(argv[2], "hw", 2) == 0)
+			omap_nand_switch_ecc(nand, 1);
+		else if (strncmp(argv[2], "sw", 2) == 0)
+			omap_nand_switch_ecc(nand, 0);
+		else
+			goto usage;
+
+		return 0;
+	}
+#endif
+
 	if (strncmp(cmd, "read", 4) == 0 || strncmp(cmd, "write", 5) == 0) {
 		int read;
 
@@ -483,6 +508,10 @@ U_BOOT_CMD(nand, 5, 1, do_nand,
 	   "nand scrub - really clean NAND erasing bad blocks (UNSAFE)\n"
 	   "nand markbad off - mark bad block at offset (UNSAFE)\n"
 	   "nand biterr off - make a bit error at offset (UNSAFE)\n"
+#if defined(CONFIG_OMAP) && (defined(CONFIG_OMAP3_BEAGLE) \
+	|| defined(CONFIG_OMAP3_EVM) || defined(CONFIG_OVERO))
+	   "nand ecc [hw/sw] - switch the ecc calculation algorithm \n"
+#endif
 	   "nand lock [tight] [status]\n"
 	   "    bring nand to lock state or display locked pages\n"
 	   "nand unlock [offset] [size] - unlock section\n");
Index: u-boot_master/drivers/mtd/nand/nand_base.c
===================================================================
--- u-boot_master.orig/drivers/mtd/nand/nand_base.c
+++ u-boot_master/drivers/mtd/nand/nand_base.c
@@ -2730,6 +2730,151 @@ int nand_scan_tail(struct mtd_info *mtd)
 	return 0;
 }
 
+#if defined(CONFIG_OMAP) && (defined(CONFIG_OMAP3_BEAGLE) \
+	|| defined(CONFIG_OMAP3_EVM) || defined(CONFIG_OVERO))
+int nand_switch_ecc(struct mtd_info *mtd)
+{
+	int i;
+	struct nand_chip *chip = mtd->priv;
+
+	if (!chip->buffers)
+		return -ENOMEM;
+
+	switch (chip->ecc.mode) {
+	case NAND_ECC_HW:
+		/* Use standard hwecc read page function ? */
+		chip->ecc.read_page = nand_read_page_hwecc;
+		chip->ecc.write_page = nand_write_page_hwecc;
+		chip->ecc.read_oob = nand_read_oob_std;
+		chip->ecc.write_oob = nand_write_oob_std;
+		break;
+	case NAND_ECC_HW_SYNDROME:
+		if ((!chip->ecc.calculate || !chip->ecc.correct ||
+			!chip->ecc.hwctl) &&
+			(!chip->ecc.read_page ||
+			chip->ecc.read_page == nand_read_page_hwecc ||
+			!chip->ecc.write_page ||
+			chip->ecc.write_page == nand_write_page_hwecc)) {
+			printk(KERN_WARNING "No ECC functions supplied, "
+				"Hardware ECC not possible\n");
+			BUG();
+		}
+		/* Use standard syndrome read/write page function ? */
+		chip->ecc.read_page = nand_read_page_syndrome;
+		chip->ecc.write_page = nand_write_page_syndrome;
+		chip->ecc.read_oob = nand_read_oob_syndrome;
+		chip->ecc.write_oob = nand_write_oob_syndrome;
+
+		if (mtd->writesize >= chip->ecc.size)
+			break;
+		printk(KERN_WARNING "%d byte HW ECC not possible on "
+			"%d byte page size, fallback to SW ECC\n",
+			chip->ecc.size, mtd->writesize);
+		chip->ecc.mode = NAND_ECC_SOFT;
+		break;
+	case NAND_ECC_SOFT:
+		chip->ecc.calculate = nand_calculate_ecc;
+		chip->ecc.correct = nand_correct_data;
+		chip->ecc.read_page = nand_read_page_swecc;
+		chip->ecc.write_page = nand_write_page_swecc;
+		chip->ecc.read_oob = nand_read_oob_std;
+		chip->ecc.write_oob = nand_write_oob_std;
+		chip->ecc.size = 256;
+		chip->ecc.bytes = 3;
+		break;
+
+	case NAND_ECC_NONE:
+		printk(KERN_WARNING "NAND_ECC_NONE selected by board driver. "
+			"This is not recommended !!\n");
+		chip->ecc.read_page = nand_read_page_raw;
+		chip->ecc.write_page = nand_write_page_raw;
+		chip->ecc.read_oob = nand_read_oob_std;
+		chip->ecc.write_oob = nand_write_oob_std;
+		chip->ecc.size = mtd->writesize;
+		chip->ecc.bytes = 0;
+		break;
+
+	default:
+		printk(KERN_WARNING "Invalid NAND_ECC_MODE %d\n",
+			chip->ecc.mode);
+		BUG();
+	}
+	/*
+	* The number of bytes available for a client to place data into
+	* the out of band area
+	*/
+	chip->ecc.layout->oobavail = 0;
+	for (i = 0; chip->ecc.layout->oobfree[i].length; i++)
+		chip->ecc.layout->oobavail +=
+			chip->ecc.layout->oobfree[i].length;
+	mtd->oobavail = chip->ecc.layout->oobavail;
+
+	/*
+	* Set the number of read / write steps for one page depending on ECC
+	* mode
+	*/
+	chip->ecc.steps = mtd->writesize / chip->ecc.size;
+	if (chip->ecc.steps * chip->ecc.size != mtd->writesize) {
+		printk(KERN_WARNING "Invalid ecc parameters\n");
+		BUG();
+	}
+	chip->ecc.total = chip->ecc.steps * chip->ecc.bytes;
+
+	/*
+	* Allow subpage writes up to ecc.steps. Not possible for MLC
+	* FLASH.
+	*/
+	if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&
+		!(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) {
+		switch (chip->ecc.steps) {
+		case 2:
+			mtd->subpage_sft = 1;
+			break;
+		case 4:
+		case 8:
+			mtd->subpage_sft = 2;
+			break;
+		}
+	}
+	chip->subpagesize = mtd->writesize >> mtd->subpage_sft;
+
+	/* Initialize state */
+	chip->state = FL_READY;
+
+	/* De-select the device */
+	chip->select_chip(mtd, -1);
+
+	/* Invalidate the pagebuffer reference */
+	chip->pagebuf = -1;
+
+	/* Fill in remaining MTD driver data */
+	mtd->type = MTD_NANDFLASH;
+	mtd->flags = MTD_CAP_NANDFLASH;
+	mtd->erase = nand_erase;
+	mtd->point = NULL;
+	mtd->unpoint = NULL;
+	mtd->read = nand_read;
+	mtd->write = nand_write;
+	mtd->read_oob = nand_read_oob;
+	mtd->write_oob = nand_write_oob;
+	mtd->sync = nand_sync;
+	mtd->lock = NULL;
+	mtd->unlock = NULL;
+	mtd->suspend = nand_suspend;
+	mtd->resume = nand_resume;
+	mtd->block_isbad = nand_block_isbad;
+	mtd->block_markbad = nand_block_markbad;
+
+	/* propagate ecc.layout to mtd_info */
+	mtd->ecclayout = chip->ecc.layout;
+
+	/* Check, if we should skip the bad block table scan */
+	if (chip->options & NAND_SKIP_BBTSCAN)
+		chip->options |= NAND_BBT_SCANNED;
+
+}
+#endif
+
 /* module_text_address() isn't exported, and it's mostly a pointless
    test if this is a module _anyway_ -- they'd have to try _really_ hard
    to call us from in-kernel code if the core NAND support is modular. */


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