First steps implementing NAND support. Not working, fails to read ID.

5 files changed, 311 insertions, 436 deletions

diff --git a/board/delta/Makefile b/board/delta/Makefile
index d968efbf81..e744eec2e0 100644
--- a/board/delta/Makefile
+++ b/board/delta/Makefile
@@ -26,7 +26,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= lib$(BOARD).a
 
-OBJS	:= delta.o flash.o
+OBJS	:= delta.o nand.o
 SOBJS	:= lowlevel_init.o
 
 $(LIB):	$(OBJS) $(SOBJS)
diff --git a/board/delta/config.mk b/board/delta/config.mk
index d48fe054a0..b269b6efa1 100644
--- a/board/delta/config.mk
+++ b/board/delta/config.mk
@@ -4,3 +4,6 @@
 #TEXT_BASE = 0x9ffe0000
 TEXT_BASE = 0xa3008000
 
+# Compile the new NAND code (needed iff #ifdef CONFIG_NEW_NAND_CODE)
+BOARDLIBS = drivers/nand/libnand.a
+
diff --git a/board/delta/delta.c b/board/delta/delta.c
index e618ab96a1..3ffcc2af9b 100644
--- a/board/delta/delta.c
+++ b/board/delta/delta.c
@@ -41,7 +41,7 @@ int board_init (void)
 	/* memory and cpu-speed are setup before relocation */
 	/* so we do _nothing_ here */
 
-	/* arch number of Lubbock-Board */
+	/* arch number of Lubbock-Board mk@tbd: fix this! */
 	gd->bd->bi_arch_number = MACH_TYPE_LUBBOCK;
 
 	/* adress of boot parameters */
diff --git a/board/delta/flash.c b/board/delta/flash.c
deleted file mode 100644
index 883c1ba3b3..0000000000
--- a/board/delta/flash.c
+++ /dev/null
@@ -1,434 +0,0 @@
-/*
- * (C) Copyright 2001
- * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
- *
- * (C) Copyright 2001
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * 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 <linux/byteorder/swab.h>
-
-
-flash_info_t flash_info[CFG_MAX_FLASH_BANKS];	/* info for FLASH chips    */
-
-/* Board support for 1 or 2 flash devices */
-#define FLASH_PORT_WIDTH32
-#undef FLASH_PORT_WIDTH16
-
-#ifdef FLASH_PORT_WIDTH16
-#define FLASH_PORT_WIDTH		ushort
-#define FLASH_PORT_WIDTHV		vu_short
-#define SWAP(x)               __swab16(x)
-#else
-#define FLASH_PORT_WIDTH		ulong
-#define FLASH_PORT_WIDTHV		vu_long
-#define SWAP(x)               __swab32(x)
-#endif
-
-#define FPW	   FLASH_PORT_WIDTH
-#define FPWV   FLASH_PORT_WIDTHV
-
-#define mb() __asm__ __volatile__ ("" : : : "memory")
-
-/*-----------------------------------------------------------------------
- * Functions
- */
-static ulong flash_get_size (FPW *addr, flash_info_t *info);
-static int write_data (flash_info_t *info, ulong dest, FPW data);
-static void flash_get_offsets (ulong base, flash_info_t *info);
-void inline spin_wheel (void);
-
-/*-----------------------------------------------------------------------
- */
-
-unsigned long flash_init (void)
-{
-#if 0
-	int i;
-	ulong size = 0;
-
-	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
-		switch (i) {
-		case 0:
-			flash_get_size ((FPW *) PHYS_FLASH_1, &flash_info[i]);
-			flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
-			break;
-		case 1:
-			flash_get_size ((FPW *) PHYS_FLASH_2, &flash_info[i]);
-			flash_get_offsets (PHYS_FLASH_2, &flash_info[i]);
-			break;
-		default:
-			panic ("configured too many flash banks!\n");
-			break;
-		}
-		size += flash_info[i].size;
-	}
-
-	/* Protect monitor and environment sectors
-	 */
-	flash_protect ( FLAG_PROTECT_SET,
-			CFG_FLASH_BASE,
-			CFG_FLASH_BASE + monitor_flash_len - 1,
-			&flash_info[0] );
-
-	flash_protect ( FLAG_PROTECT_SET,
-			CFG_ENV_ADDR,
-			CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0] );
-
-	return size;
-#endif
-	return 0;
-}
-
-/*-----------------------------------------------------------------------
- */
-static void flash_get_offsets (ulong base, flash_info_t *info)
-{
-	int i;
-
-	if (info->flash_id == FLASH_UNKNOWN) {
-		return;
-	}
-
-	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
-		for (i = 0; i < info->sector_count; i++) {
-			info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
-			info->protect[i] = 0;
-		}
-	}
-}
-
-/*-----------------------------------------------------------------------
- */
-void flash_print_info (flash_info_t *info)
-{
-	int i;
-
-	if (info->flash_id == FLASH_UNKNOWN) {
-		printf ("missing or unknown FLASH type\n");
-		return;
-	}
-
-	switch (info->flash_id & FLASH_VENDMASK) {
-	case FLASH_MAN_INTEL:
-		printf ("INTEL ");
-		break;
-	default:
-		printf ("Unknown Vendor ");
-		break;
-	}
-
-	switch (info->flash_id & FLASH_TYPEMASK) {
-	case FLASH_28F128J3A:
-		printf ("28F128J3A\n");
-		break;
-	default:
-		printf ("Unknown Chip Type\n");
-		break;
-	}
-
-	printf ("  Size: %ld MB in %d Sectors\n",
-			info->size >> 20, info->sector_count);
-
-	printf ("  Sector Start Addresses:");
-	for (i = 0; i < info->sector_count; ++i) {
-		if ((i % 5) == 0)
-			printf ("\n   ");
-		printf (" %08lX%s",
-			info->start[i],
-			info->protect[i] ? " (RO)" : "     ");
-	}
-	printf ("\n");
-	return;
-}
-
-/*
- * The following code cannot be run from FLASH!
- */
-static ulong flash_get_size (FPW *addr, flash_info_t *info)
-{
-	volatile FPW value;
-
-	/* Write auto select command: read Manufacturer ID */
-	addr[0x5555] = (FPW) 0x00AA00AA;
-	addr[0x2AAA] = (FPW) 0x00550055;
-	addr[0x5555] = (FPW) 0x00900090;
-
-	mb ();
-	value = addr[0];
-
-	switch (value) {
-
-	case (FPW) INTEL_MANUFACT:
-		info->flash_id = FLASH_MAN_INTEL;
-		break;
-
-	default:
-		info->flash_id = FLASH_UNKNOWN;
-		info->sector_count = 0;
-		info->size = 0;
-		addr[0] = (FPW) 0x00FF00FF;	/* restore read mode */
-		return (0);			/* no or unknown flash  */
-	}
-
-	mb ();
-	value = addr[1];			/* device ID        */
-
-	switch (value) {
-
-	case (FPW) INTEL_ID_28F128J3A:
-		info->flash_id += FLASH_28F128J3A;
-		info->sector_count = 128;
-		info->size = 0x02000000;
-		break;				/* => 16 MB     */
-
-	default:
-		info->flash_id = FLASH_UNKNOWN;
-		break;
-	}
-
-	if (info->sector_count > CFG_MAX_FLASH_SECT) {
-		printf ("** ERROR: sector count %d > max (%d) **\n",
-			info->sector_count, CFG_MAX_FLASH_SECT);
-		info->sector_count = CFG_MAX_FLASH_SECT;
-	}
-
-	addr[0] = (FPW) 0x00FF00FF;		/* restore read mode */
-
-	return (info->size);
-}
-
-
-/*-----------------------------------------------------------------------
- */
-
-int flash_erase (flash_info_t *info, int s_first, int s_last)
-{
-	int flag, prot, sect;
-	ulong type, start, last;
-	int rcode = 0;
-
-	if ((s_first < 0) || (s_first > s_last)) {
-		if (info->flash_id == FLASH_UNKNOWN) {
-			printf ("- missing\n");
-		} else {
-			printf ("- no sectors to erase\n");
-		}
-		return 1;
-	}
-
-	type = (info->flash_id & FLASH_VENDMASK);
-	if ((type != FLASH_MAN_INTEL)) {
-		printf ("Can't erase unknown flash type %08lx - aborted\n",
-			info->flash_id);
-		return 1;
-	}
-
-	prot = 0;
-	for (sect = s_first; sect <= s_last; ++sect) {
-		if (info->protect[sect]) {
-			prot++;
-		}
-	}
-
-	if (prot) {
-		printf ("- Warning: %d protected sectors will not be erased!\n",
-			prot);
-	} else {
-		printf ("\n");
-	}
-
-	start = get_timer (0);
-	last = start;
-
-	/* Disable interrupts which might cause a timeout here */
-	flag = disable_interrupts ();
-
-	/* Start erase on unprotected sectors */
-	for (sect = s_first; sect <= s_last; sect++) {
-		if (info->protect[sect] == 0) {	/* not protected */
-			FPWV *addr = (FPWV *) (info->start[sect]);
-			FPW status;
-
-			printf ("Erasing sector %2d ... ", sect);
-
-			/* arm simple, non interrupt dependent timer */
-			reset_timer_masked ();
-
-			*addr = (FPW) 0x00500050;	/* clear status register */
-			*addr = (FPW) 0x00200020;	/* erase setup */
-			*addr = (FPW) 0x00D000D0;	/* erase confirm */
-
-			while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
-				if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) {
-					printf ("Timeout\n");
-					*addr = (FPW) 0x00B000B0;	/* suspend erase     */
-					*addr = (FPW) 0x00FF00FF;	/* reset to read mode */
-					rcode = 1;
-					break;
-				}
-			}
-
-			*addr = 0x00500050;	/* clear status register cmd.   */
-			*addr = 0x00FF00FF;	/* resest to read mode          */
-
-			printf (" done\n");
-		}
-	}
-	return rcode;
-}
-
-/*-----------------------------------------------------------------------
- * Copy memory to flash, returns:
- * 0 - OK
- * 1 - write timeout
- * 2 - Flash not erased
- * 4 - Flash not identified
- */
-
-int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
-{
-	ulong cp, wp;
-	FPW data;
-	int count, i, l, rc, port_width;
-
-	if (info->flash_id == FLASH_UNKNOWN) {
-		return 4;
-	}
-/* get lower word aligned address */
-#ifdef FLASH_PORT_WIDTH16
-	wp = (addr & ~1);
-	port_width = 2;
-#else
-	wp = (addr & ~3);
-	port_width = 4;
-#endif
-
-	/*
-	 * handle unaligned start bytes
-	 */
-	if ((l = addr - wp) != 0) {
-		data = 0;
-		for (i = 0, cp = wp; i < l; ++i, ++cp) {
-			data = (data << 8) | (*(uchar *) cp);
-		}
-		for (; i < port_width && cnt > 0; ++i) {
-			data = (data << 8) | *src++;
-			--cnt;
-			++cp;
-		}
-		for (; cnt == 0 && i < port_width; ++i, ++cp) {
-			data = (data << 8) | (*(uchar *) cp);
-		}
-
-		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
-			return (rc);
-		}
-		wp += port_width;
-	}
-
-	/*
-	 * handle word aligned part
-	 */
-	count = 0;
-	while (cnt >= port_width) {
-		data = 0;
-		for (i = 0; i < port_width; ++i) {
-			data = (data << 8) | *src++;
-		}
-		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
-			return (rc);
-		}
-		wp += port_width;
-		cnt -= port_width;
-		if (count++ > 0x800) {
-			spin_wheel ();
-			count = 0;
-		}
-	}
-
-	if (cnt == 0) {
-		return (0);
-	}
-
-	/*
-	 * handle unaligned tail bytes
-	 */
-	data = 0;
-	for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
-		data = (data << 8) | *src++;
-		--cnt;
-	}
-	for (; i < port_width; ++i, ++cp) {
-		data = (data << 8) | (*(uchar *) cp);
-	}
-
-	return (write_data (info, wp, SWAP (data)));
-}
-
-/*-----------------------------------------------------------------------
- * Write a word or halfword to Flash, returns:
- * 0 - OK
- * 1 - write timeout
- * 2 - Flash not erased
- */
-static int write_data (flash_info_t *info, ulong dest, FPW data)
-{
-	FPWV *addr = (FPWV *) dest;
-	ulong status;
-	int flag;
-
-	/* Check if Flash is (sufficiently) erased */
-	if ((*addr & data) != data) {
-		printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
-		return (2);
-	}
-	/* Disable interrupts which might cause a timeout here */
-	flag = disable_interrupts ();
-
-	*addr = (FPW) 0x00400040;	/* write setup */
-	*addr = data;
-
-	/* arm simple, non interrupt dependent timer */
-	reset_timer_masked ();
-
-	/* wait while polling the status register */
-	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
-		if (get_timer_masked () > CFG_FLASH_WRITE_TOUT) {
-			*addr = (FPW) 0x00FF00FF;	/* restore read mode */
-			return (1);
-		}
-	}
-
-	*addr = (FPW) 0x00FF00FF;	/* restore read mode */
-
-	return (0);
-}
-
-void inline spin_wheel (void)
-{
-	static int p = 0;
-	static char w[] = "\\/-";
-
-	printf ("\010%c", w[p]);
-	(++p == 3) ? (p = 0) : 0;
-}
diff --git a/board/delta/nand.c b/board/delta/nand.c
new file mode 100644
index 0000000000..9caddba064
--- /dev/null
+++ b/board/delta/nand.c
@@ -0,0 +1,306 @@
+/*
+ * (C) Copyright 2006 DENX Software Engineering
+ *
+ * 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>
+
+#if (CONFIG_COMMANDS & CFG_CMD_NAND)
+#ifdef CONFIG_NEW_NAND_CODE
+
+#include <nand.h>
+#include <asm/arch/pxa-regs.h>
+
+/*
+ * hardware specific access to control-lines
+ * function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c)
+ */
+static void delta_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+{
+#if 0
+	struct nand_chip *this = mtdinfo->priv;
+	ulong base = (ulong) this->IO_ADDR_W;
+
+	switch(cmd) {
+	case NAND_CTL_SETCLE:
+		MACRO_NAND_CTL_SETCLE((unsigned long)base);
+		break;
+	case NAND_CTL_CLRCLE:
+		MACRO_NAND_CTL_CLRCLE((unsigned long)base);
+		break;
+	case NAND_CTL_SETALE:
+		MACRO_NAND_CTL_SETALE((unsigned long)base);
+		break;
+	case NAND_CTL_CLRALE:
+		MACRO_NAND_CTL_CLRALE((unsigned long)base);
+		break;
+	case NAND_CTL_SETNCE:
+		MACRO_NAND_ENABLE_CE((unsigned long)base);
+		break;
+	case NAND_CTL_CLRNCE:
+		MACRO_NAND_DISABLE_CE((unsigned long)base);
+		break;
+	}
+#endif
+}
+
+
+/* read device ready pin */
+static int delta_device_ready(struct mtd_info *mtdinfo)
+{
+	if(NDSR & NDSR_RDY)
+		return 1;
+	else
+		return 0;
+#if 0
+	struct nand_chip *this = mtdinfo->priv;
+	ulong rb_gpio_pin;
+
+	/* use the base addr to find out which chip are we dealing with */
+	switch((ulong) this->IO_ADDR_W) {
+	case CFG_NAND0_BASE:
+		rb_gpio_pin = CFG_NAND0_RDY;
+		break;
+	case CFG_NAND1_BASE:
+		rb_gpio_pin = CFG_NAND1_RDY;
+		break;
+	default: /* this should never happen */
+		return 0;
+		break;
+	}
+
+        if (in32(GPIO0_IR) & rb_gpio_pin)
+		return 1;
+#endif
+	return 0;
+}
+
+static u_char delta_read_byte(struct mtd_info *mtd)
+{
+/* 	struct nand_chip *this = mtd->priv; */
+	unsigned long tmp;
+
+	/* wait for read request */
+	while(1) {
+		if(NDSR & NDSR_RDDREQ) {
+			NDSR |= NDSR_RDDREQ;
+			break;
+		}
+	}
+
+	tmp = NDDB;
+	printk("delta_read_byte: 0x%x.\n", tmp); 
+	return (u_char) tmp;
+}
+
+/* this is really monahans, not board specific ... */
+static void delta_cmdfunc(struct mtd_info *mtd, unsigned command, 
+			  int column, int page_addr)
+{
+	/* register struct nand_chip *this = mtd->priv; */
+	unsigned long ndcb0=0, ndcb1=0, ndcb2=0;
+	uchar command2;
+
+	/* Clear NDSR */
+	NDSR = 0xFFF;
+	
+	/* apparently NDCR[NDRUN] needs to be set before writing to NDCBx */
+	NDCR |= NDCR_ND_RUN;
+
+	/* wait for write command request 
+	 * hmm, might be nice if this could time-out. mk@tbd
+	 */
+	while(1) {
+		if(NDSR & NDSR_WRCMDREQ) {
+			NDSR |= NDSR_WRCMDREQ; /* Ack */
+			break;
+		}
+	}
+
+	/* if command is a double byte cmd, we set bit double cmd bit 19 */
+	command2 = (command>>8) & 0xFF;
+	ndcb0 = command | ((command2 ? 1 : 0) << 19);
+
+	switch (command) {
+	case NAND_CMD_READID:
+		printk("delta_cmdfunc: NAND_CMD_READID.\n");
+		ndcb0 |= ((3 << 21) | (2 << 16));
+		break;
+	case NAND_CMD_PAGEPROG:
+	case NAND_CMD_ERASE1:
+	case NAND_CMD_ERASE2:
+	case NAND_CMD_SEQIN:
+	case NAND_CMD_STATUS:
+		return;
+	case NAND_CMD_RESET:
+		return;
+	default:
+		printk("delta_cmdfunc: error, unkown command issued.\n");
+		return;
+	}
+
+	NDCB0 = ndcb0;
+	NDCB1 = ndcb1;
+	NDCB2 = ndcb2;	
+}
+
+/*
+ * 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.
+ */
+void board_nand_init(struct nand_chip *nand)
+{
+	unsigned long tCH, tCS, tWH, tWP, tRH, tRP, tRP_high, tR, tWHR, tAR;
+
+	/* set up GPIO Control Registers */
+	
+	/* turn on the NAND Controller Clock (104 MHz @ D0) */
+	CKENA |= (CKENA_4_NAND | CKENA_9_SMC);
+	
+	/* NAND Timing Parameters (in ns) */
+#define NAND_TIMING_tCH 	10
+#define NAND_TIMING_tCS 	0
+#define NAND_TIMING_tWH		20
+#define NAND_TIMING_tWP 	40
+#define NAND_TIMING_tRH 	20
+#define NAND_TIMING_tRP 	40
+#define NAND_TIMING_tR  	11123
+#define NAND_TIMING_tWHR	110
+#define NAND_TIMING_tAR		10
+
+/* Maximum values for NAND Interface Timing Registers in DFC clock
+ * periods */
+#define DFC_MAX_tCH		7
+#define DFC_MAX_tCS		7
+#define DFC_MAX_tWH		7
+#define DFC_MAX_tWP		7
+#define DFC_MAX_tRH		7
+#define DFC_MAX_tRP		15
+#define DFC_MAX_tR		65535
+#define DFC_MAX_tWHR		15
+#define DFC_MAX_tAR		15
+
+#define DFC_CLOCK		104		/* DFC Clock is 104 MHz */
+#define DFC_CLK_PER_US		DFC_CLOCK/1000	/* clock period in ns */
+#define MIN(x, y)		((x < y) ? x : y)
+
+	
+	tCH = MIN(((unsigned long) (NAND_TIMING_tCH * DFC_CLK_PER_US) + 1), 
+		  DFC_MAX_tCH);
+	tCS = MIN(((unsigned long) (NAND_TIMING_tCS * DFC_CLK_PER_US) + 1), 
+		  DFC_MAX_tCS);
+	tWH = MIN(((unsigned long) (NAND_TIMING_tWH * DFC_CLK_PER_US) + 1),
+		  DFC_MAX_tWH);
+	tWP = MIN(((unsigned long) (NAND_TIMING_tWP * DFC_CLK_PER_US) + 1),
+		  DFC_MAX_tWP);
+	tRH = MIN(((unsigned long) (NAND_TIMING_tRH * DFC_CLK_PER_US) + 1),
+		  DFC_MAX_tRH);
+	tRP = MIN(((unsigned long) (NAND_TIMING_tRP * DFC_CLK_PER_US) + 1),
+		  DFC_MAX_tRP);
+	tR = MIN(((unsigned long) (NAND_TIMING_tR * DFC_CLK_PER_US) + 1),
+		 DFC_MAX_tR);
+	tWHR = MIN(((unsigned long) (NAND_TIMING_tWHR * DFC_CLK_PER_US) + 1),
+		   DFC_MAX_tWHR);
+	tAR = MIN(((unsigned long) (NAND_TIMING_tAR * DFC_CLK_PER_US) + 1),
+		  DFC_MAX_tAR);
+	
+
+	/* tRP value is split in the register */
+	if(tRP & (1 << 4)) {
+		tRP_high = 1;
+		tRP &= ~(1 << 4);
+	} else {
+		tRP_high = 0;
+	}
+
+	NDTR0CS0 = (tCH << 19) |
+		(tCS << 16) |
+		(tWH << 11) |
+		(tWP << 8) |
+		(tRP_high << 6) |
+		(tRH << 3) |
+		(tRP << 0);
+	
+	NDTR1CS0 = (tR << 16) |
+		(tWHR << 4) |
+		(tAR << 0);
+
+	
+
+	/* If it doesn't work (unlikely) think about:
+	 *  - ecc enable
+	 *  - chip select don't care
+	 *  - read id byte count
+	 *
+	 * Intentionally enabled by not setting bits:
+	 *  - dma (DMA_EN)
+	 *  - page size = 512
+	 *  - cs don't care, see if we can enable later!
+	 *  - row address start position (after second cycle)
+	 *  - pages per block = 32
+	 */
+	NDCR = (NDCR_ND_ARB_EN |	/* enable bus arbiter */
+		NDCR_SPARE_EN |		/* use the spare area */
+		NDCR_DWIDTH_C |		/* 16bit DFC data bus width  */
+		NDCR_DWIDTH_M |		/* 16 bit Flash device data bus width */
+		(2 << 16) |		/* read id count = 7 ???? mk@tbd */
+		NDCE_RDYM |		/* flash device ready ir masked */
+		NDCE_CS0_PAGEDM |	/* ND_nCSx page done ir masked */
+		NDCE_CS1_PAGEDM |
+		NDCE_CS0_CMDDM |	/* ND_CSx command done ir masked */
+		NDCE_CS1_CMDDM |
+		NDCE_CS0_BBDM |		/* ND_CSx bad block detect ir masked */
+		NDCE_CS1_BBDM |
+		NDCE_DBERRM |		/* double bit error ir masked */ 
+		NDCE_SBERRM |		/* single bit error ir masked */
+		NDCE_WRDREQM |		/* write data request ir masked */
+		NDCE_RDDREQM |		/* read data request ir masked */
+		NDCE_WRCMDREQM);	/* write command request ir masked */
+	
+	
+	
+	nand->hwcontrol = delta_hwcontrol;
+	nand->dev_ready = delta_device_ready;
+	nand->eccmode = NAND_ECC_SOFT;
+	nand->chip_delay = NAND_DELAY_US;
+	nand->options = NAND_BUSWIDTH_16;
+	nand->read_byte = delta_read_byte;
+	nand->cmdfunc = delta_cmdfunc;
+	/* 	nand->options = NAND_SAMSUNG_LP_OPTIONS; */
+}
+
+#else
+#error "U-Boot legacy NAND support not available for delta board."
+#endif
+#endif