Initial revision

1 files changed, 719 insertions, 0 deletions

diff --git a/board/mvs1/flash.c b/board/mvs1/flash.c
new file mode 100644
index 00000000000..75d9048bac0
--- /dev/null
+++ b/board/mvs1/flash.c
@@ -0,0 +1,719 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Changes for MATRIX Vision MVsensor (C) Copyright 2001
+ * MATRIX Vision GmbH / hg, info@matrix-vision.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 <mpc8xx.h>
+
+#undef MVDEBUG
+#ifdef MVDEBUG
+#define mvdebug debug
+#else
+#define mvdebug(p) do {} while (0)
+#endif
+
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
+
+
+#ifdef CONFIG_MVS_16BIT_FLASH
+	#define FLASH_DATA_MASK 0xffff
+	#define FLASH_SHIFT 0
+#else
+	#define FLASH_DATA_MASK 0xffffffff
+	#define FLASH_SHIFT 1
+#endif
+
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+static ulong flash_get_size (vu_long *address, flash_info_t *info);
+static int write_word (flash_info_t *info, ulong dest, ulong data);
+static void flash_get_offsets (ulong base, flash_info_t *info);
+
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long flash_init (void)
+{
+	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	unsigned long size_b0, size_b1;
+	int i;
+
+	/* Init: no FLASHes known */
+	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+		flash_info[i].flash_id = FLASH_UNKNOWN;
+	}
+
+	/* Static FLASH Bank configuration here - FIXME XXX */
+
+	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
+
+	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
+		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
+			size_b0, size_b0<<20);
+	}
+
+#if defined (FLASH_BASE1_PRELIM)
+	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
+
+	if (size_b1 > size_b0) {
+		printf ("## ERROR: "
+			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
+			size_b1, size_b1<<20,
+			size_b0, size_b0<<20
+		);
+		flash_info[0].flash_id	= FLASH_UNKNOWN;
+		flash_info[1].flash_id	= FLASH_UNKNOWN;
+		flash_info[0].sector_count	= -1;
+		flash_info[1].sector_count	= -1;
+		flash_info[0].size		= 0;
+		flash_info[1].size		= 0;
+		return (0);
+	}
+#else
+	size_b1 = 0;
+#endif
+
+	/* Remap FLASH according to real size */
+	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000);
+#ifdef CONFIG_MVS_16BIT_FLASH
+	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_PS_16 | BR_MS_GPCM | BR_V;
+#else
+	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_PS_32 | BR_MS_GPCM | BR_V;
+#endif
+
+	/* Re-do sizing to get full correct info */
+	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
+
+	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
+
+	/* monitor protection ON by default */
+	flash_protect(FLAG_PROTECT_SET,
+		      CFG_FLASH_BASE,
+		      CFG_FLASH_BASE+CFG_MONITOR_LEN-1,
+		      &flash_info[0]);
+
+	if (size_b1) {
+		memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
+#ifdef CONFIG_MVS_16BIT_FLASH
+		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
+				    BR_PS_16 | BR_MS_GPCM | BR_V;
+#else
+		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
+				    BR_PS_32 | BR_MS_GPCM | BR_V;
+#endif
+		/* Re-do sizing to get full correct info */
+		size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
+					  &flash_info[1]);
+
+		flash_get_offsets (CFG_FLASH_BASE + size_b0, &flash_info[1]);
+
+		/* monitor protection ON by default */
+		flash_protect(FLAG_PROTECT_SET,
+			      CFG_FLASH_BASE,
+			      CFG_FLASH_BASE+CFG_MONITOR_LEN-1,
+			      &flash_info[1]);
+	} else {
+		memctl->memc_br1 = 0;		/* invalidate bank */
+
+		flash_info[1].flash_id = FLASH_UNKNOWN;
+		flash_info[1].sector_count = -1;
+	}
+
+	flash_info[0].size = size_b0;
+	flash_info[1].size = size_b1;
+
+	return (size_b0 + size_b1);
+}
+
+/*-----------------------------------------------------------------------
+ */
+static void flash_get_offsets (ulong base, flash_info_t *info)
+{
+	int i;
+
+	/* set up sector start address table */
+	if (info->flash_id & FLASH_BTYPE)
+	{	/* bottom boot sector types - these are the useful ones! */
+		/* set sector offsets for bottom boot block type */
+		if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B)
+		{	/* AMDLV320B has 8 x 8k bottom boot sectors */
+			for (i = 0; i < 8; i++)												/* +8k		*/
+				info->start[i] = base + (i * (0x00002000 << FLASH_SHIFT));
+			for (; i < info->sector_count; i++)									/* +64k		*/
+				info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT)) - (0x00070000 << FLASH_SHIFT);
+		}
+		else
+		{	/* other types have 4 bottom boot sectors (16,8,8,32) */
+			i = 0;
+			info->start[i++] = base +  0x00000000;								/* -		*/
+			info->start[i++] = base + (0x00004000 << FLASH_SHIFT);				/* +16k		*/
+			info->start[i++] = base + (0x00006000 << FLASH_SHIFT);				/* +8k		*/
+			info->start[i++] = base + (0x00008000 << FLASH_SHIFT);				/* +8k		*/
+			info->start[i++] = base + (0x00010000 << FLASH_SHIFT);				/* +32k		*/
+			for (; i < info->sector_count; i++)									/* +64k		*/
+				info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT)) - (0x00030000 << FLASH_SHIFT);
+		}
+	}
+	else
+	{	/* top boot sector types - not so useful */
+		/* set sector offsets for top boot block type */
+		if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T)
+		{	/* AMDLV320T has 8 x 8k top boot sectors */
+			for (i = 0; i < info->sector_count - 8; i++)						/* +64k		*/
+				info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT));
+			for (; i < info->sector_count; i++)									/* +8k		*/
+				info->start[i] = base + (i * (0x00002000 << FLASH_SHIFT));
+		}
+		else
+		{	/* other types have 4 top boot sectors (32,8,8,16) */
+			for (i = 0; i < info->sector_count - 4; i++)						/* +64k		*/
+				info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT));
+
+			info->start[i++] = base + info->size - (0x00010000 << FLASH_SHIFT);	/* -32k		*/
+			info->start[i++] = base + info->size - (0x00008000 << FLASH_SHIFT);	/* -8k		*/
+			info->start[i++] = base + info->size - (0x00006000 << FLASH_SHIFT);	/* -8k		*/
+			info->start[i]   = base + info->size - (0x00004000 << FLASH_SHIFT);	/* -16k		*/
+		}
+	}
+}
+
+/*-----------------------------------------------------------------------
+ */
+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_AMD:	printf ("AMD ");		break;
+	case FLASH_MAN_FUJ:	printf ("FUJITSU ");	break;
+	case FLASH_MAN_STM:	printf ("ST ");			break;
+	default:		printf ("Unknown Vendor ");	break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
+				break;
+	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
+				break;
+	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
+				break;
+	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
+				break;
+	case FLASH_STMW320DB:	printf ("M29W320B (32 Mbit, bottom boot sect)\n");
+				break;
+	case FLASH_STMW320DT:	printf ("M29W320T (32 Mbit, top boot sector)\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");
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+
+/*-----------------------------------------------------------------------
+ */
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+
+#define	AMD_ID_LV160T_MVS	(AMD_ID_LV160T & FLASH_DATA_MASK)
+#define AMD_ID_LV160B_MVS	(AMD_ID_LV160B & FLASH_DATA_MASK)
+#define AMD_ID_LV320T_MVS	(AMD_ID_LV320T & FLASH_DATA_MASK)
+#define AMD_ID_LV320B_MVS	(AMD_ID_LV320B & FLASH_DATA_MASK)
+#define STM_ID_W320DT_MVS	(STM_ID_29W320DT & FLASH_DATA_MASK)
+#define STM_ID_W320DB_MVS	(STM_ID_29W320DB & FLASH_DATA_MASK)
+#define AMD_MANUFACT_MVS	(AMD_MANUFACT  & FLASH_DATA_MASK)
+#define FUJ_MANUFACT_MVS	(FUJ_MANUFACT  & FLASH_DATA_MASK)
+#define STM_MANUFACT_MVS	(STM_MANUFACT  & FLASH_DATA_MASK)
+
+#define AUTOSELECT_ADDR1	0x0555
+#define AUTOSELECT_ADDR2	0x02AA
+#define AUTOSELECT_ADDR3	AUTOSELECT_ADDR1
+
+#define AUTOSELECT_DATA1	(0x00AA00AA & FLASH_DATA_MASK)
+#define AUTOSELECT_DATA2	(0x00550055 & FLASH_DATA_MASK)
+#define AUTOSELECT_DATA3	(0x00900090 & FLASH_DATA_MASK)
+
+#define RESET_BANK_DATA		(0x00F000F0 & FLASH_DATA_MASK)
+
+static ulong flash_get_size (vu_long *address, flash_info_t *info)
+{
+	short i;
+#ifdef CONFIG_MVS_16BIT_FLASH
+	ushort value;
+	vu_short *addr = (vu_short *)address;
+#else
+	ulong value;
+	vu_long *addr = (vu_long *)address;
+#endif
+	ulong base = (ulong)address;
+
+	/* Write auto select command: read Manufacturer ID */
+	addr[AUTOSELECT_ADDR1] = AUTOSELECT_DATA1;
+	addr[AUTOSELECT_ADDR2] = AUTOSELECT_DATA2;
+	addr[AUTOSELECT_ADDR3] = AUTOSELECT_DATA3;
+
+	value = addr[0];			/* manufacturer ID	*/
+	switch (value) {
+	case AMD_MANUFACT_MVS:
+		info->flash_id = FLASH_MAN_AMD;
+		break;
+	case FUJ_MANUFACT_MVS:
+		info->flash_id = FLASH_MAN_FUJ;
+		break;
+	case STM_MANUFACT_MVS:
+		info->flash_id = FLASH_MAN_STM;
+		break;
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		info->sector_count = 0;
+		info->size = 0;
+		return (0);			/* no or unknown flash	*/
+	}
+
+	value = addr[1];			/* device ID		*/
+	switch (value) {
+	case AMD_ID_LV160T_MVS:
+		info->flash_id += FLASH_AM160T;
+		info->sector_count = 37;
+		info->size = (0x00200000 << FLASH_SHIFT);
+		break;				/* => 2 or 4 MB		*/
+
+	case AMD_ID_LV160B_MVS:
+		info->flash_id += FLASH_AM160B;
+		info->sector_count = 37;
+		info->size = (0x00200000 << FLASH_SHIFT);
+		break;				/* => 2 or 4 MB		*/
+
+	case AMD_ID_LV320T_MVS:
+		info->flash_id += FLASH_AM320T;
+		info->sector_count = 71;
+		info->size = (0x00400000 << FLASH_SHIFT);
+		break;				/* => 4 or 8 MB		*/
+
+	case AMD_ID_LV320B_MVS:
+		info->flash_id += FLASH_AM320B;
+		info->sector_count = 71;
+		info->size = (0x00400000 << FLASH_SHIFT);
+		break;				/* => 4 or 8MB		*/
+
+	case STM_ID_W320DT_MVS:
+		info->flash_id += FLASH_STMW320DT;
+		info->sector_count = 67;
+		info->size = (0x00400000 << FLASH_SHIFT);
+		break;				/* => 4 or 8 MB		*/
+
+	case STM_ID_W320DB_MVS:
+		info->flash_id += FLASH_STMW320DB;
+		info->sector_count = 67;
+		info->size = (0x00400000 << FLASH_SHIFT);
+		break;				/* => 4 or 8MB		*/
+
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		return (0);			/* => no or unknown flash */
+
+	}
+
+	/* set up sector start address table */
+	flash_get_offsets (base, info);
+
+	/* check for protected sectors */
+	for (i = 0; i < info->sector_count; i++) {
+		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
+		/* D0 = 1 if protected */
+#ifdef CONFIG_MVS_16BIT_FLASH
+		addr = (vu_short *)(info->start[i]);
+#else
+		addr = (vu_long *)(info->start[i]);
+#endif
+		info->protect[i] = addr[2] & 1;
+	}
+
+	/*
+	 * Prevent writes to uninitialized FLASH.
+	 */
+	if (info->flash_id != FLASH_UNKNOWN) {
+#ifdef CONFIG_MVS_16BIT_FLASH
+		addr = (vu_short *)info->start[0];
+#else
+		addr = (vu_long *)info->start[0];
+#endif
+		*addr = RESET_BANK_DATA;	/* reset bank */
+	}
+
+	return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ */
+
+#define ERASE_ADDR1 0x0555
+#define ERASE_ADDR2 0x02AA
+#define ERASE_ADDR3 ERASE_ADDR1
+#define ERASE_ADDR4 ERASE_ADDR1
+#define ERASE_ADDR5 ERASE_ADDR2
+
+#define ERASE_DATA1 (0x00AA00AA & FLASH_DATA_MASK)
+#define ERASE_DATA2 (0x00550055 & FLASH_DATA_MASK)
+#define ERASE_DATA3 (0x00800080 & FLASH_DATA_MASK)
+#define ERASE_DATA4 ERASE_DATA1
+#define ERASE_DATA5 ERASE_DATA2
+
+#define ERASE_SECTOR_DATA (0x00300030 & FLASH_DATA_MASK)
+#define ERASE_CHIP_DATA (0x00100010 & FLASH_DATA_MASK)
+#define ERASE_CONFIRM_DATA (0x00800080 & FLASH_DATA_MASK)
+
+int	flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+#ifdef CONFIG_MVS_16BIT_FLASH
+	vu_short *addr = (vu_short *)(info->start[0]);
+#else
+	vu_long *addr = (vu_long *)(info->start[0]);
+#endif
+	int flag, prot, sect, l_sect;
+	ulong start, now, last;
+
+	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;
+	}
+
+	if ((info->flash_id == FLASH_UNKNOWN) ||
+	    (info->flash_id > FLASH_AMD_COMP)) {
+		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");
+	}
+
+	l_sect = -1;
+
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	addr[ERASE_ADDR1] = ERASE_DATA1;
+	addr[ERASE_ADDR2] = ERASE_DATA2;
+	addr[ERASE_ADDR3] = ERASE_DATA3;
+	addr[ERASE_ADDR4] = ERASE_DATA4;
+	addr[ERASE_ADDR5] = ERASE_DATA5;
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect<=s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+#ifdef CONFIG_MVS_16BIT_FLASH
+			addr = (vu_short *)(info->start[sect]);
+#else
+			addr = (vu_long *)(info->start[sect]);
+#endif
+			addr[0] = ERASE_SECTOR_DATA;
+			l_sect = sect;
+		}
+	}
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* wait at least 80us - let's wait 1 ms */
+	udelay (1000);
+
+	/*
+	 * We wait for the last triggered sector
+	 */
+	if (l_sect < 0)
+		goto DONE;
+
+	start = get_timer (0);
+	last  = start;
+#ifdef CONFIG_MVS_16BIT_FLASH
+	addr = (vu_short *)(info->start[l_sect]);
+#else
+	addr = (vu_long *)(info->start[l_sect]);
+#endif
+	while ((addr[0] & ERASE_CONFIRM_DATA) != ERASE_CONFIRM_DATA) {
+		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+			printf ("Timeout\n");
+			return 1;
+		}
+		/* show that we're waiting */
+		if ((now - last) > 1000) {	/* every second */
+			putc ('.');
+			last = now;
+		}
+	}
+
+DONE:
+	/* reset to read mode */
+#ifdef CONFIG_MVS_16BIT_FLASH
+	addr = (vu_short *)info->start[0];
+#else
+	addr = (vu_long *)info->start[0];
+#endif
+	addr[0] = RESET_BANK_DATA;	/* reset bank */
+
+	printf (" done\n");
+	return 0;
+}
+
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+
+int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+#define BUFF_INC 4
+	ulong cp, wp, data;
+	int i, l, rc;
+
+	mvdebug (("+write_buff %p ==> 0x%08lx, count = 0x%08lx\n", src, addr, cnt));
+
+	wp = (addr & ~3);	/* get lower word aligned address */
+	/*
+	 * handle unaligned start bytes
+	 */
+	if ((l = addr - wp) != 0) {
+		mvdebug ((" handle unaligned start bytes (cnt = 0x%08%lx)\n", cnt));
+		data = 0;
+		for (i=0, cp=wp; i<l; ++i, ++cp) {
+			data = (data << 8) | (*(uchar *)cp);
+		}
+		for (; i<BUFF_INC && cnt>0; ++i) {
+			data = (data << 8) | *src++;
+			--cnt;
+			++cp;
+		}
+		for (; cnt==0 && i<BUFF_INC; ++i, ++cp) {
+			data = (data << 8) | (*(uchar *)cp);
+		}
+
+		if ((rc = write_word(info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp += BUFF_INC;
+	}
+
+	/*
+	 * handle (half)word aligned part
+	 */
+	mvdebug ((" handle word aligned part (cnt = 0x%08%lx)\n", cnt));
+	while (cnt >= BUFF_INC) {
+		data = 0;
+		for (i=0; i<BUFF_INC; ++i) {
+			data = (data << 8) | *src++;
+		}
+		if ((rc = write_word(info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp  += BUFF_INC;
+		cnt -= BUFF_INC;
+	}
+
+	if (cnt == 0) {
+		return (0);
+	}
+
+	/*
+	 * handle unaligned tail bytes
+	 */
+	mvdebug ((" handle unaligned tail bytes (cnt = 0x%08%lx)\n", cnt));
+	data = 0;
+	for (i=0, cp=wp; i<BUFF_INC && cnt>0; ++i, ++cp) {
+		data = (data << 8) | *src++;
+		--cnt;
+	}
+	for (; i<BUFF_INC; ++i, ++cp) {
+		data = (data << 8) | (*(uchar *)cp);
+	}
+
+	return (write_word(info, wp, data));
+}
+
+#define WRITE_ADDR1 0x0555
+#define WRITE_ADDR2 0x02AA
+#define WRITE_ADDR3 WRITE_ADDR1
+
+#define WRITE_DATA1 (0x00AA00AA & FLASH_DATA_MASK)
+#define WRITE_DATA2 (0x00550055 & FLASH_DATA_MASK)
+#define WRITE_DATA3 (0x00A000A0 & FLASH_DATA_MASK)
+
+#define WRITE_CONFIRM_DATA ERASE_CONFIRM_DATA
+
+#ifndef CONFIG_MVS_16BIT_FLASH
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+	vu_long *addr = (vu_long *)(info->start[0]);
+	ulong start;
+	int flag;
+
+	mvdebug (("+write_word (to 0x%08lx)\n", dest));
+	/* Check if Flash is (sufficiently) erased */
+	if ((*((vu_long *)dest) & data) != data) {
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	addr[WRITE_ADDR1] = WRITE_DATA1;
+	addr[WRITE_ADDR2] = WRITE_DATA2;
+	addr[WRITE_ADDR3] = WRITE_DATA3;
+
+	*((vu_long *)dest) = data;
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* data polling for D7 */
+	start = get_timer (0);
+	addr = (vu_long *)dest;
+	while ((*addr & WRITE_CONFIRM_DATA) != (data & WRITE_CONFIRM_DATA)) {
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			return (1);
+		}
+	}
+
+ 	mvdebug (("-write_word\n"));
+	return (0);
+}
+#else /* CONFIG_MVS_16BIT_FLASH */
+/*-----------------------------------------------------------------------
+ * Write a halfword to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_halfword (flash_info_t *info, ulong dest, ushort data)
+{
+	vu_short *addr = (vu_short *)(info->start[0]);
+	ulong start;
+	int flag;
+
+	mvdebug (("+write_halfword (to 0x%08lx)\n", dest));
+	/* Check if Flash is (sufficiently) erased */
+	if ((*((vu_short *)dest) & data) != data) {
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	addr[WRITE_ADDR1] = WRITE_DATA1;
+	addr[WRITE_ADDR2] = WRITE_DATA2;
+	addr[WRITE_ADDR3] = WRITE_DATA3;
+
+	*((vu_short *)dest) = data;
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* data polling for D7 */
+	start = get_timer (0);
+	addr = (vu_short *)dest;
+	while ((*addr & WRITE_CONFIRM_DATA) != (data & WRITE_CONFIRM_DATA)) {
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			return (1);
+		}
+	}
+ 	mvdebug (("-write_halfword\n"));
+	return (0);
+}
+
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+	int result = 0;
+
+	if (write_halfword (info, dest, (data & ~FLASH_DATA_MASK) >> 16) == 0)
+	{
+		dest += 2;
+		data = data & FLASH_DATA_MASK;
+		result = write_halfword (info, dest, data);
+	}
+	return result;
+}
+#endif
+/*-----------------------------------------------------------------------
+ */