board/pm520/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2001
  * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
  *
  * (C) Copyright 2001-2004
  * 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[CONFIG_SYS_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)			(x)
 #else
 #define FLASH_PORT_WIDTH	ulong
 #define FLASH_PORT_WIDTHV	vu_long
 #define SWAP(x)			(x)
 #endif

 /* Intel-compatible flash ID */
 #define INTEL_COMPAT		0x00890089
 #define INTEL_ALT		0x00B000B0

 /* Intel-compatible flash commands */
 #define INTEL_PROGRAM		0x00100010
 #define INTEL_ERASE		0x00200020
 #define INTEL_CLEAR		0x00500050
 #define INTEL_LOCKBIT		0x00600060
 #define INTEL_PROTECT		0x00010001
 #define INTEL_STATUS		0x00700070
 #define INTEL_READID		0x00900090
 #define INTEL_CONFIRM		0x00D000D0
 #define INTEL_RESET		0xFFFFFFFF

 /* Intel-compatible flash status bits */
 #define INTEL_FINISHED		0x00800080
 #define INTEL_OK		0x00800080

 #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);
 static void flash_sync_real_protect (flash_info_t * info);
 static unsigned char intel_sector_protected (flash_info_t *info, ushort sector);

 /*-----------------------------------------------------------------------
  */

 unsigned long flash_init (void)
 {
 	int i;
 	ulong size = 0;
 	extern void flash_preinit(void);
 	extern void flash_afterinit(ulong, ulong);
 	ulong flashbase = CONFIG_SYS_FLASH_BASE;

 	flash_preinit();

 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 		switch (i) {
 		case 0:
 			memset(&flash_info[i], 0, sizeof(flash_info_t));
 			flash_get_size ((FPW *) flashbase, &flash_info[i]);
 			flash_get_offsets (flash_info[i].start[0], &flash_info[i]);
 			break;
 		default:
 			panic ("configured to many flash banks!\n");
 			break;
 		}
 		size += flash_info[i].size;

 		/* get the h/w and s/w protection status in sync */
 		flash_sync_real_protect(&flash_info[i]);
 	}

 	/* Protect monitor and environment sectors
 	 */
 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 #ifndef CONFIG_BOOT_ROM
 	flash_protect ( FLAG_PROTECT_SET,
 			CONFIG_SYS_MONITOR_BASE,
 			CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 			&flash_info[0] );
 #endif
 #endif

 #ifdef	CONFIG_ENV_IS_IN_FLASH
 	flash_protect ( FLAG_PROTECT_SET,
 			CONFIG_ENV_ADDR,
 			CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0] );
 #endif

 	flash_afterinit(flash_info[0].start[0], flash_info[0].size);

 	return size;
 }

 /*-----------------------------------------------------------------------
  */
 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);
 		}
 	}
 }

 /*-----------------------------------------------------------------------
  */
 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_28F256J3A:
 		printf ("28F256J3A\n");
 		break;

 	case FLASH_28F128J3A:
 		printf ("28F128J3A\n");
 		break;

 	case FLASH_28F640J3A:
 		printf ("28F640J3A\n");
 		break;

 	case FLASH_28F320J3A:
 		printf ("28F320J3A\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 ();
 	udelay(100);

 	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_28F256J3A:
 		info->flash_id += FLASH_28F256J3A;
 		/* In U-Boot we support only 32 MB (no bank-switching) */
 		info->sector_count = 256 / 2;
 		info->size =  0x04000000 / 2;
 		info->start[0] = CONFIG_SYS_FLASH_BASE + 0x02000000;
 		break;				/* => 32 MB     */

 	case (FPW) INTEL_ID_28F128J3A:
 		info->flash_id += FLASH_28F128J3A;
 		info->sector_count = 128;
 		info->size = 0x02000000;
 		info->start[0] = CONFIG_SYS_FLASH_BASE + 0x02000000;
 		break;				/* => 32 MB     */

 	case (FPW) INTEL_ID_28F640J3A:
 		info->flash_id += FLASH_28F640J3A;
 		info->sector_count = 64;
 		info->size = 0x01000000;
 		info->start[0] = CONFIG_SYS_FLASH_BASE + 0x03000000;
 		break;				/* => 16 MB     */

 	case (FPW) INTEL_ID_28F320J3A:
 		info->flash_id += FLASH_28F320J3A;
 		info->sector_count = 32;
 		info->size = 0x800000;
 		info->start[0] = CONFIG_SYS_FLASH_BASE + 0x03800000;
 		break;				/* => 8 MB     */

 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		break;
 	}

 	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
 		printf ("** ERROR: sector count %d > max (%d) **\n",
 			info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
 		info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 	}

 	addr[0] = (FPW) 0x00FF00FF;		/* restore read mode */

 	return (info->size);
 }


 /*
  * This function gets the u-boot flash sector protection status
  * (flash_info_t.protect[]) in sync with the sector protection
  * status stored in hardware.
  */
 static void flash_sync_real_protect (flash_info_t * info)
 {
 	int i;

 	switch (info->flash_id & FLASH_TYPEMASK) {

 	case FLASH_28F256J3A:
 	case FLASH_28F128J3A:
 	case FLASH_28F640J3A:
 	case FLASH_28F320J3A:
 		for (i = 0; i < info->sector_count; ++i) {
 			info->protect[i] = intel_sector_protected(info, i);
 		}
 		break;
 	default:
 		/* no h/w protect support */
 		break;
 	}
 }


 /*
  * checks if "sector" in bank "info" is protected. Should work on intel
  * strata flash chips 28FxxxJ3x in 8-bit mode.
  * Returns 1 if sector is protected (or timed-out while trying to read
  * protection status), 0 if it is not.
  */
 static unsigned char intel_sector_protected (flash_info_t *info, ushort sector)
 {
 	FPWV *addr;
 	FPWV *lock_conf_addr;
 	ulong start;
 	unsigned char ret;

 	/*
 	 * first, wait for the WSM to be finished. The rationale for
 	 * waiting for the WSM to become idle for at most
 	 * CONFIG_SYS_FLASH_ERASE_TOUT is as follows. The WSM can be busy
 	 * because of: (1) erase, (2) program or (3) lock bit
 	 * configuration. So we just wait for the longest timeout of
 	 * the (1)-(3), i.e. the erase timeout.
 	 */

 	/* wait at least 35ns (W12) before issuing Read Status Register */
 	udelay(1);
 	addr = (FPWV *) info->start[sector];
 	*addr = (FPW) INTEL_STATUS;

 	start = get_timer (0);
 	while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
 		if (get_timer (start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 			*addr = (FPW) INTEL_RESET; /* restore read mode */
 			printf("WSM busy too long, can't get prot status\n");
 			return 1;
 		}
 	}

 	/* issue the Read Identifier Codes command */
 	*addr = (FPW) INTEL_READID;

 	/* wait at least 35ns (W12) before reading */
 	udelay(1);

 	/* Intel example code uses offset of 2 for 16 bit flash */
 	lock_conf_addr = (FPWV *) info->start[sector] + 2;
 	ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0;

 	/* put flash back in read mode */
 	*addr = (FPW) INTEL_RESET;

 	return ret;
 }

 /*-----------------------------------------------------------------------
  */

 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 */
 			start = get_timer(0);

 			*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(start) > CONFIG_SYS_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;
 	ulong start;
 	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 */
 	start = get_timer(0);

 	/* wait while polling the status register */
 	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
 		if (get_timer(start) > CONFIG_SYS_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;
 }

 /*-----------------------------------------------------------------------
  * Set/Clear sector's lock bit, returns:
  * 0 - OK
  * 1 - Error (timeout, voltage problems, etc.)
  */
 int flash_real_protect (flash_info_t *info, long sector, int prot)
 {
 	ulong start;
 	int i;
 	int rc = 0;
 	vu_long *addr = (vu_long *)(info->start[sector]);
 	int flag = disable_interrupts();

 	*addr = INTEL_CLEAR;	/* Clear status register */
 	if (prot) {			/* Set sector lock bit */
 		*addr = INTEL_LOCKBIT;	/* Sector lock bit */
 		*addr = INTEL_PROTECT;	/* set */
 	}
 	else {				/* Clear sector lock bit */
 		*addr = INTEL_LOCKBIT;	/* All sectors lock bits */
 		*addr = INTEL_CONFIRM;	/* clear */
 	}

 	start = get_timer(0);

 	while ((*addr & INTEL_FINISHED) != INTEL_FINISHED) {
 		if (get_timer(start) > CONFIG_SYS_FLASH_UNLOCK_TOUT) {
 			printf("Flash lock bit operation timed out\n");
 			rc = 1;
 			break;
 		}
 	}

 	if (*addr != INTEL_OK) {
 		printf("Flash lock bit operation failed at %08X, CSR=%08X\n",
 		       (uint)addr, (uint)*addr);
 		rc = 1;
 	}

 	if (!rc)
 		info->protect[sector] = prot;

 	/*
 	 * Clear lock bit command clears all sectors lock bits, so
 	 * we have to restore lock bits of protected sectors.
 	 * WARNING: code below re-locks sectors only for one bank (info).
 	 * This causes problems on boards where several banks share
 	 * the same chip, as sectors in othere banks will be unlocked
 	 * but not re-locked. It works fine on pm520 though, as there
 	 * is only one chip and one bank.
 	 */
 	if (!prot)
 	{
 		for (i = 0; i < info->sector_count; i++)
 		{
 			if (info->protect[i])
 			{
 				start = get_timer(0);
 				addr = (vu_long *)(info->start[i]);
 				*addr = INTEL_LOCKBIT;	/* Sector lock bit */
 				*addr = INTEL_PROTECT;	/* set */
 				while ((*addr & INTEL_FINISHED) != INTEL_FINISHED)
 				{
 					if (get_timer(start) > CONFIG_SYS_FLASH_UNLOCK_TOUT)
 					{
 						printf("Flash lock bit operation timed out\n");
 						rc = 1;
 						break;
 					}
 				}
 			}
 		}
 		/*
 		 * get the s/w sector protection status in sync with the h/w,
 		 * in case something went wrong during the re-locking.
 		 */
 		flash_sync_real_protect(info); /* resets flash to read  mode */
 	}

 	if (flag)
 		enable_interrupts();

 	*addr = INTEL_RESET;		/* Reset to read array mode */

 	return rc;
 }
	/*
	* (C) Copyright 2001
	* Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
	*
	* (C) Copyright 2001-2004
	* 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[CONFIG_SYS_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) (x)
	#else
	#define FLASH_PORT_WIDTH ulong
	#define FLASH_PORT_WIDTHV vu_long
	#define SWAP(x) (x)
	#endif

	/* Intel-compatible flash ID */
	#define INTEL_COMPAT 0x00890089
	#define INTEL_ALT 0x00B000B0

	/* Intel-compatible flash commands */
	#define INTEL_PROGRAM 0x00100010
	#define INTEL_ERASE 0x00200020
	#define INTEL_CLEAR 0x00500050
	#define INTEL_LOCKBIT 0x00600060
	#define INTEL_PROTECT 0x00010001
	#define INTEL_STATUS 0x00700070
	#define INTEL_READID 0x00900090
	#define INTEL_CONFIRM 0x00D000D0
	#define INTEL_RESET 0xFFFFFFFF

	/* Intel-compatible flash status bits */
	#define INTEL_FINISHED 0x00800080
	#define INTEL_OK 0x00800080

	#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);
	static void flash_sync_real_protect (flash_info_t * info);
	static unsigned char intel_sector_protected (flash_info_t *info, ushort sector);

	/*-----------------------------------------------------------------------
	*/

	unsigned long flash_init (void)
	{
	int i;
	ulong size = 0;
	extern void flash_preinit(void);
	extern void flash_afterinit(ulong, ulong);
	ulong flashbase = CONFIG_SYS_FLASH_BASE;

	flash_preinit();

	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
	switch (i) {
	case 0:
	memset(&flash_info[i], 0, sizeof(flash_info_t));
	flash_get_size ((FPW *) flashbase, &flash_info[i]);
	flash_get_offsets (flash_info[i].start[0], &flash_info[i]);
	break;
	default:
	panic ("configured to many flash banks!\n");
	break;
	}
	size += flash_info[i].size;

	/* get the h/w and s/w protection status in sync */
	flash_sync_real_protect(&flash_info[i]);
	}

	/* Protect monitor and environment sectors
	*/
	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	#ifndef CONFIG_BOOT_ROM
	flash_protect ( FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
	&flash_info[0] );
	#endif
	#endif

	#ifdef CONFIG_ENV_IS_IN_FLASH
	flash_protect ( FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0] );
	#endif

	flash_afterinit(flash_info[0].start[0], flash_info[0].size);

	return size;
	}

	/*-----------------------------------------------------------------------
	*/
	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);
	}
	}
	}

	/*-----------------------------------------------------------------------
	*/
	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_28F256J3A:
	printf ("28F256J3A\n");
	break;

	case FLASH_28F128J3A:
	printf ("28F128J3A\n");
	break;

	case FLASH_28F640J3A:
	printf ("28F640J3A\n");
	break;

	case FLASH_28F320J3A:
	printf ("28F320J3A\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 ();
	udelay(100);

	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_28F256J3A:
	info->flash_id += FLASH_28F256J3A;
	/* In U-Boot we support only 32 MB (no bank-switching) */
	info->sector_count = 256 / 2;
	info->size = 0x04000000 / 2;
	info->start[0] = CONFIG_SYS_FLASH_BASE + 0x02000000;
	break; /* => 32 MB */

	case (FPW) INTEL_ID_28F128J3A:
	info->flash_id += FLASH_28F128J3A;
	info->sector_count = 128;
	info->size = 0x02000000;
	info->start[0] = CONFIG_SYS_FLASH_BASE + 0x02000000;
	break; /* => 32 MB */

	case (FPW) INTEL_ID_28F640J3A:
	info->flash_id += FLASH_28F640J3A;
	info->sector_count = 64;
	info->size = 0x01000000;
	info->start[0] = CONFIG_SYS_FLASH_BASE + 0x03000000;
	break; /* => 16 MB */

	case (FPW) INTEL_ID_28F320J3A:
	info->flash_id += FLASH_28F320J3A;
	info->sector_count = 32;
	info->size = 0x800000;
	info->start[0] = CONFIG_SYS_FLASH_BASE + 0x03800000;
	break; /* => 8 MB */

	default:
	info->flash_id = FLASH_UNKNOWN;
	break;
	}

	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
	printf (" ERROR: sector count %d > max (%d) \n",
	info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
	info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
	}

	addr[0] = (FPW) 0x00FF00FF; /* restore read mode */

	return (info->size);
	}


	/*
	* This function gets the u-boot flash sector protection status
	* (flash_info_t.protect[]) in sync with the sector protection
	* status stored in hardware.
	*/
	static void flash_sync_real_protect (flash_info_t * info)
	{
	int i;

	switch (info->flash_id & FLASH_TYPEMASK) {

	case FLASH_28F256J3A:
	case FLASH_28F128J3A:
	case FLASH_28F640J3A:
	case FLASH_28F320J3A:
	for (i = 0; i < info->sector_count; ++i) {
	info->protect[i] = intel_sector_protected(info, i);
	}
	break;
	default:
	/* no h/w protect support */
	break;
	}
	}


	/*
	* checks if "sector" in bank "info" is protected. Should work on intel
	* strata flash chips 28FxxxJ3x in 8-bit mode.
	* Returns 1 if sector is protected (or timed-out while trying to read
	* protection status), 0 if it is not.
	*/
	static unsigned char intel_sector_protected (flash_info_t *info, ushort sector)
	{
	FPWV *addr;
	FPWV *lock_conf_addr;
	ulong start;
	unsigned char ret;

	/*
	* first, wait for the WSM to be finished. The rationale for
	* waiting for the WSM to become idle for at most
	* CONFIG_SYS_FLASH_ERASE_TOUT is as follows. The WSM can be busy
	* because of: (1) erase, (2) program or (3) lock bit
	* configuration. So we just wait for the longest timeout of
	* the (1)-(3), i.e. the erase timeout.
	*/

	/* wait at least 35ns (W12) before issuing Read Status Register */
	udelay(1);
	addr = (FPWV *) info->start[sector];
	*addr = (FPW) INTEL_STATUS;

	start = get_timer (0);
	while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
	if (get_timer (start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
	addr = (FPW) INTEL_RESET; / restore read mode */
	printf("WSM busy too long, can't get prot status\n");
	return 1;
	}
	}

	/* issue the Read Identifier Codes command */
	*addr = (FPW) INTEL_READID;

	/* wait at least 35ns (W12) before reading */
	udelay(1);

	/* Intel example code uses offset of 2 for 16 bit flash */
	lock_conf_addr = (FPWV *) info->start[sector] + 2;
	ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0;

	/* put flash back in read mode */
	*addr = (FPW) INTEL_RESET;

	return ret;
	}

	/*-----------------------------------------------------------------------
	*/

	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 */
	start = get_timer(0);

	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(start) > CONFIG_SYS_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;
	ulong start;
	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 */
	start = get_timer(0);

	/* wait while polling the status register */
	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
	if (get_timer(start) > CONFIG_SYS_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;
	}

	/*-----------------------------------------------------------------------
	* Set/Clear sector's lock bit, returns:
	* 0 - OK
	* 1 - Error (timeout, voltage problems, etc.)
	*/
	int flash_real_protect (flash_info_t *info, long sector, int prot)
	{
	ulong start;
	int i;
	int rc = 0;
	vu_long addr = (vu_long )(info->start[sector]);
	int flag = disable_interrupts();

	addr = INTEL_CLEAR; / Clear status register */
	if (prot) { /* Set sector lock bit */
	addr = INTEL_LOCKBIT; / Sector lock bit */
	addr = INTEL_PROTECT; / set */
	}
	else { /* Clear sector lock bit */
	addr = INTEL_LOCKBIT; / All sectors lock bits */
	addr = INTEL_CONFIRM; / clear */
	}

	start = get_timer(0);

	while ((*addr & INTEL_FINISHED) != INTEL_FINISHED) {
	if (get_timer(start) > CONFIG_SYS_FLASH_UNLOCK_TOUT) {
	printf("Flash lock bit operation timed out\n");
	rc = 1;
	break;
	}
	}

	if (*addr != INTEL_OK) {
	printf("Flash lock bit operation failed at %08X, CSR=%08X\n",
	(uint)addr, (uint)*addr);
	rc = 1;
	}

	if (!rc)
	info->protect[sector] = prot;

	/*
	* Clear lock bit command clears all sectors lock bits, so
	* we have to restore lock bits of protected sectors.
	* WARNING: code below re-locks sectors only for one bank (info).
	* This causes problems on boards where several banks share
	* the same chip, as sectors in othere banks will be unlocked
	* but not re-locked. It works fine on pm520 though, as there
	* is only one chip and one bank.
	*/
	if (!prot)
	{
	for (i = 0; i < info->sector_count; i++)
	{
	if (info->protect[i])
	{
	start = get_timer(0);
	addr = (vu_long *)(info->start[i]);
	addr = INTEL_LOCKBIT; / Sector lock bit */
	addr = INTEL_PROTECT; / set */
	while ((*addr & INTEL_FINISHED) != INTEL_FINISHED)
	{
	if (get_timer(start) > CONFIG_SYS_FLASH_UNLOCK_TOUT)
	{
	printf("Flash lock bit operation timed out\n");
	rc = 1;
	break;
	}
	}
	}
	}
	/*
	* get the s/w sector protection status in sync with the h/w,
	* in case something went wrong during the re-locking.
	*/
	flash_sync_real_protect(info); /* resets flash to read mode */
	}

	if (flag)
	enable_interrupts();

	addr = INTEL_RESET; / Reset to read array mode */

	return rc;
	}