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

 /********************************************************************
  *
  * Unless otherwise specified, Copyright (C) 2004-2005 Barco Control Rooms
  *
  * $Source: /home/services/cvs/firmware/ppc/u-boot-1.1.2/board/barco/flash.c,v $
  * $Revision: 1.3 $
  * $Author: mleeman $
  * $Date: 2005/02/21 12:48:58 $
  *
  * Last ChangeLog Entry
  * $Log: flash.c,v $
  * Revision 1.3  2005/02/21 12:48:58  mleeman
  * update of copyright years (feedback wd)
  *
  * Revision 1.2  2005/02/21 11:04:04  mleeman
  * remove dead code and Coding style (feedback wd)
  *
  * Revision 1.1  2005/02/14 09:23:46  mleeman
  * - moved 'barcohydra' directory to a more generic barco; since we will be
  *   supporting and adding multiple boards
  *
  * Revision 1.2  2005/02/09 12:56:23  mleeman
  * add generic header to track changes in sources
  *
  *
  *******************************************************************/

 /*
  * (C) Copyright 2000
  * 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 <mpc824x.h>
 #include <asm/processor.h>
 #include <flash.h>

 #define ROM_CS0_START	0xFF800000
 #define ROM_CS1_START	0xFF000000

 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips    */

 #if defined(CONFIG_ENV_IS_IN_FLASH)
 # ifndef  CONFIG_ENV_ADDR
 #  define CONFIG_ENV_ADDR  (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 # endif
 # ifndef  CONFIG_ENV_SIZE
 #  define CONFIG_ENV_SIZE  CONFIG_ENV_SECT_SIZE
 # endif
 # ifndef  CONFIG_ENV_SECT_SIZE
 #  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
 # endif
 #endif

 /*-----------------------------------------------------------------------
  * Functions
  */
 static int write_word (flash_info_t *info, ulong dest, ulong data);

 /*flash command address offsets*/

 #define ADDR0		(0xAAA)
 #define ADDR1		(0x555)
 #define ADDR3		(0x001)

 #define FLASH_WORD_SIZE unsigned char

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

 static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));

 typedef struct{
   FLASH_WORD_SIZE extval;
   unsigned short intval;
 } map_entry;

 static unsigned long flash_id(unsigned char mfct, unsigned char chip)
 {
 	static const map_entry mfct_map[] = {
 		{(FLASH_WORD_SIZE) AMD_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
 		{(FLASH_WORD_SIZE) FUJ_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
 		{(FLASH_WORD_SIZE) STM_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
 		{(FLASH_WORD_SIZE) MT_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
 		{(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
 		{(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
 	};

 	static const map_entry chip_map[] = {
 		{AMD_ID_F040B,	FLASH_AM040},
 		{AMD_ID_F033C,	FLASH_AM033},
 		{AMD_ID_F065D,	FLASH_AM065},
 		{ATM_ID_LV040,	FLASH_AT040},
 		{(FLASH_WORD_SIZE) STM_ID_x800AB,	FLASH_STM800AB}
 	};

 	const map_entry *p;
 	unsigned long result = FLASH_UNKNOWN;

 	/* find chip id */
 	for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++){
 		if(p->extval == chip){
 			result = FLASH_VENDMASK | p->intval;
 			break;
 		}
 	}

 	/* find vendor id */
 	for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++){
 		if(p->extval == mfct){
 			result &= ~FLASH_VENDMASK;
 			result |= (unsigned long) p->intval << 16;
 			break;
 		}
 	}

 	return result;
 }


 unsigned long flash_init(void)
 {
 	unsigned long i;
 	unsigned char j;
 	static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;

 	/* Init: no FLASHes known */
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++){
 		flash_info_t * const pflinfo = &flash_info[i];
 		pflinfo->flash_id = FLASH_UNKNOWN;
 		pflinfo->size = 0;
 		pflinfo->sector_count = 0;
 	}

 	/* Enable writes to Hydra/Argus flash */
 	{
 		register unsigned int temp;
 		CONFIG_READ_WORD(PICR1,temp);
 		temp |= PICR1_FLASH_WR_EN;
 		CONFIG_WRITE_WORD(PICR1,temp);
 	}

 	for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++){
 		flash_info_t * const pflinfo = &flash_info[i];
 		const unsigned long base_address = flash_banks[i];
 		volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;

 		/* write autoselect sequence */
 		flash[0x5555] = 0xaa;
 		flash[0x2aaa] = 0x55;
 		flash[0x5555] = 0x90;
 		__asm__ __volatile__("sync");

 		pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);

 		switch(pflinfo->flash_id & FLASH_TYPEMASK){
 			case FLASH_AM033:
 				pflinfo->size = 0x00200000;
 				pflinfo->sector_count = 64;
 				for(j = 0; j < 64; j++){
 					pflinfo->start[j] = base_address + 0x00010000 * j;
 					pflinfo->protect[j] = flash[(j << 16) | 0x2];
 				}
 				break;
 			case FLASH_AM065:
 				pflinfo->size = 0x00800000;
 				pflinfo->sector_count =128;
 				for(j = 0; j < 128; j++){
 					pflinfo->start[j] = base_address + 0x00010000 * j;
 					pflinfo->protect[j] = flash[(j << 16) | 0x2];
 				}
 				break;
 			case FLASH_AT040:
 				pflinfo->size = 0x00080000;
 				pflinfo->sector_count = 2;
 				pflinfo->start[0] = base_address ;
 				pflinfo->start[1] = base_address + 0x00004000;
 				pflinfo->protect[0] = ((flash[0x02] & 0X01)==0) ? 0X02 : 0X01;
 				pflinfo->protect[1] = 0X02;
 				break;
 			case FLASH_AM040:
 				pflinfo->size = 0x00080000;
 				pflinfo->sector_count = 8;
 				for(j = 0; j < 8; j++){
 					pflinfo->start[j] = base_address + 0x00010000 * j;
 					pflinfo->protect[j] = flash[(j << 16) | 0x2];
 				}
 				break;
 			case FLASH_STM800AB:
 				pflinfo->size = 0x00100000;
 				pflinfo->sector_count = 19;
 				pflinfo->start[0] = base_address;
 				pflinfo->start[1] = base_address + 0x4000;
 				pflinfo->start[2] = base_address + 0x6000;
 				pflinfo->start[3] = base_address + 0x8000;
 				for(j = 1; j < 16; j++){
 					pflinfo->start[j+3] = base_address + 0x00010000 * j;
 				}
 				break;
 		}
 		/* Protect monitor and environment sectors */
 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 		flash_protect(FLAG_PROTECT_SET,
 				CONFIG_SYS_MONITOR_BASE,
 				CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 				&flash_info[0]);
 #endif

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

 		/* reset device to read mode */
 		flash[0x0000] = 0xf0;
 		__asm__ __volatile__("sync");
 	}

 	return flash_info[0].size + flash_info[1].size;
 }

 /*-----------------------------------------------------------------------
  */
 void flash_print_info(flash_info_t *info)
 {
 	static const char unk[] = "Unknown";
 	const char *mfct = unk, *type = unk;
 	unsigned int i;

 	if(info->flash_id != FLASH_UNKNOWN){
 		switch(info->flash_id & FLASH_VENDMASK){
 			case FLASH_MAN_ATM:
 				mfct = "Atmel";
 				break;
 			case FLASH_MAN_AMD:
 				mfct = "AMD";
 				break;
 			case FLASH_MAN_FUJ:
 				mfct = "FUJITSU";
 				break;
 			case FLASH_MAN_STM:
 				mfct = "STM";
 				break;
 			case FLASH_MAN_SST:
 				mfct = "SST";
 				break;
 			case FLASH_MAN_BM:
 				mfct = "Bright Microelectonics";
 				break;
 			case FLASH_MAN_INTEL:
 				mfct = "Intel";
 				break;
 		}

 		switch(info->flash_id & FLASH_TYPEMASK){
 			case FLASH_AT040:
 				type = "AT49LV040 (512K * 8, uniform sector size)";
 				break;
 			case FLASH_AM033:
 				type = "AM29F033C (4 Mbit * 8, uniform sector size)";
 				break;
 			case FLASH_AM040:
 				type = "AM29F040B (512K * 8, uniform sector size)";
 				break;
 			case FLASH_AM065:
 				type = "AM29F0465D ( 8 MBit * 8, uniform sector size) or part of AM29F652D( 16 MB)";
 				break;
 			case FLASH_AM400B:
 				type = "AM29LV400B (4 Mbit, bottom boot sect)";
 				break;
 			case FLASH_AM400T:
 				type = "AM29LV400T (4 Mbit, top boot sector)";
 				break;
 			case FLASH_AM800B:
 				type = "AM29LV800B (8 Mbit, bottom boot sect)";
 				break;
 			case FLASH_AM800T:
 				type = "AM29LV800T (8 Mbit, top boot sector)";
 				break;
 			case FLASH_AM160T:
 				type = "AM29LV160T (16 Mbit, top boot sector)";
 				break;
 			case FLASH_AM320B:
 				type = "AM29LV320B (32 Mbit, bottom boot sect)";
 				break;
 			case FLASH_AM320T:
 				type = "AM29LV320T (32 Mbit, top boot sector)";
 				break;
 			case FLASH_STM800AB:
 				type = "M29W800AB (8 Mbit, bottom boot sect)";
 				break;
 			case FLASH_SST800A:
 				type = "SST39LF/VF800 (8 Mbit, uniform sector size)";
 				break;
 			case FLASH_SST160A:
 				type = "SST39LF/VF160 (16 Mbit, uniform sector size)";
 				break;
 		}
 	}

 	printf(
 			"\n  Brand: %s Type: %s\n"
 			"  Size: %lu KB in %d Sectors\n",
 			mfct,
 			type,
 			info->size >> 10,
 			info->sector_count
 	      );

 	printf ("  Sector Start Addresses:");

 	for (i = 0; i < info->sector_count; i++){
 		unsigned long size;
 		unsigned int erased;
 		unsigned long * flash = (unsigned long *) info->start[i];

 		/*
 		 * Check if whole sector is erased
 		 */
 		size =
 			(i != (info->sector_count - 1)) ?
 			(info->start[i + 1] - info->start[i]) >> 2 :
 			(info->start[0] + info->size - info->start[i]) >> 2;

 		for(
 				flash = (unsigned long *) info->start[i], erased = 1;
 				(flash != (unsigned long *) info->start[i] + size) && erased;
 				flash++
 		   ){
 			erased = *flash == ~0x0UL;
 		}

 		printf(
 				"%s %08lX %s %s",
 				(i % 5) ? "" : "\n   ",
 				info->start[i],
 				erased ? "E" : " ",
 				info->protect[i] ? "RO" : "  "
 		      );
 	}

 	puts("\n");
 	return;
 }

 int flash_erase(flash_info_t *info, int s_first, int s_last)
 {
 	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 	int flag, prot, sect, l_sect;
 	ulong start, now, last;
 	unsigned char sh8b;

 	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_MAN_STM | FLASH_AMD_COMP))) {
 		printf ("Can't erase unknown flash type - aborted\n");
 		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;

 	/* Check the ROM CS */
 	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START)){
 		sh8b = 3;
 	}
 	else{
 		sh8b = 0;
 	}

 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
 	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect<=s_last; sect++) {
 		if (info->protect[sect] == 0) { /* not protected */
 			addr = (FLASH_WORD_SIZE *)(info->start[0] + (
 						(info->start[sect] - info->start[0]) << sh8b));
 			if (info->flash_id & FLASH_MAN_SST){
 				addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 				addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 				addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
 				addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 				addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 				addr[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
 				udelay(30000);  /* wait 30 ms */
 			}
 			else
 				addr[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 			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;
 	addr = (FLASH_WORD_SIZE *)(info->start[0] + (
 				(info->start[l_sect] - info->start[0]) << sh8b));
 	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 		if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 			printf ("Timeout\n");
 			return 1;
 		}
 		/* show that we're waiting */
 		if ((now - last) > 1000) {  /* every second */
 			serial_putc ('.');
 			last = now;
 		}
 	}

 DONE:
 	/* reset to read mode */
 	addr = (FLASH_WORD_SIZE *)info->start[0];
 	addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* 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)
 {
 	ulong cp, wp, data;
 	int i, l, rc;

 	wp = (addr & ~3);   /* get lower word aligned address */

 	/*
 	 * 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<4 && cnt>0; ++i) {
 			data = (data << 8) | *src++;
 			--cnt;
 			++cp;
 		}
 		for (; cnt==0 && i<4; ++i, ++cp) {
 			data = (data << 8) | (*(uchar *)cp);
 		}

 		if ((rc = write_word(info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		data = 0;
 		for (i=0; i<4; ++i) {
 			data = (data << 8) | *src++;
 		}
 		if ((rc = write_word(info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp  += 4;
 		cnt -= 4;
 	}

 	if (cnt == 0) {
 		return (0);
 	}

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 		data = (data << 8) | *src++;
 		--cnt;
 	}
 	for (; i<4; ++i, ++cp) {
 		data = (data << 8) | (*(uchar *)cp);
 	}

 	return (write_word(info, wp, data));
 }

 /*-----------------------------------------------------------------------
  * 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)
 {
 	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)info->start[0];
 	volatile FLASH_WORD_SIZE *dest2;
 	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
 	ulong start;
 	int flag;
 	int i;
 	unsigned char sh8b;

 	/* Check the ROM CS */
 	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START)){
 		sh8b = 3;
 	}
 	else{
 		sh8b = 0;
 	}

 	dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
 			info->start[0]);

 	/* Check if Flash is (sufficiently) erased */
 	if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
 		return (2);
 	}
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++){
 		addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 		addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 		addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;

 		dest2[i << sh8b] = data2[i];

 		/* re-enable interrupts if necessary */
 		if (flag){
 			enable_interrupts();
 		}

 		/* data polling for D7 */
 		start = get_timer (0);
 		while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
 				(data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
 			if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 				return (1);
 			}
 		}
 	}

 	return (0);
 }

 /*----------------------------------------------------------------------- */
	/********************************************************************
	*
	* Unless otherwise specified, Copyright (C) 2004-2005 Barco Control Rooms
	*
	* $Source: /home/services/cvs/firmware/ppc/u-boot-1.1.2/board/barco/flash.c,v $
	* $Revision: 1.3 $
	* $Author: mleeman $
	* $Date: 2005/02/21 12:48:58 $
	*
	* Last ChangeLog Entry
	* $Log: flash.c,v $
	* Revision 1.3 2005/02/21 12:48:58 mleeman
	* update of copyright years (feedback wd)
	*
	* Revision 1.2 2005/02/21 11:04:04 mleeman
	* remove dead code and Coding style (feedback wd)
	*
	* Revision 1.1 2005/02/14 09:23:46 mleeman
	* - moved 'barcohydra' directory to a more generic barco; since we will be
	* supporting and adding multiple boards
	*
	* Revision 1.2 2005/02/09 12:56:23 mleeman
	* add generic header to track changes in sources
	*
	*
	*******************************************************************/

	/*
	* (C) Copyright 2000
	* 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 <mpc824x.h>
	#include <asm/processor.h>
	#include <flash.h>

	#define ROM_CS0_START 0xFF800000
	#define ROM_CS1_START 0xFF000000

	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */

	#if defined(CONFIG_ENV_IS_IN_FLASH)
	# ifndef CONFIG_ENV_ADDR
	# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
	# endif
	# ifndef CONFIG_ENV_SIZE
	# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
	# endif
	# ifndef CONFIG_ENV_SECT_SIZE
	# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
	# endif
	#endif

	/*-----------------------------------------------------------------------
	* Functions
	*/
	static int write_word (flash_info_t *info, ulong dest, ulong data);

	/flash command address offsets/

	#define ADDR0 (0xAAA)
	#define ADDR1 (0x555)
	#define ADDR3 (0x001)

	#define FLASH_WORD_SIZE unsigned char

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

	static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));

	typedef struct{
	FLASH_WORD_SIZE extval;
	unsigned short intval;
	} map_entry;

	static unsigned long flash_id(unsigned char mfct, unsigned char chip)
	{
	static const map_entry mfct_map[] = {
	{(FLASH_WORD_SIZE) AMD_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
	{(FLASH_WORD_SIZE) FUJ_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
	{(FLASH_WORD_SIZE) STM_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
	{(FLASH_WORD_SIZE) MT_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
	{(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
	{(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
	};

	static const map_entry chip_map[] = {
	{AMD_ID_F040B, FLASH_AM040},
	{AMD_ID_F033C, FLASH_AM033},
	{AMD_ID_F065D, FLASH_AM065},
	{ATM_ID_LV040, FLASH_AT040},
	{(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
	};

	const map_entry *p;
	unsigned long result = FLASH_UNKNOWN;

	/* find chip id */
	for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++){
	if(p->extval == chip){
	result = FLASH_VENDMASK \| p->intval;
	break;
	}
	}

	/* find vendor id */
	for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++){
	if(p->extval == mfct){
	result &= ~FLASH_VENDMASK;
	result \|= (unsigned long) p->intval << 16;
	break;
	}
	}

	return result;
	}


	unsigned long flash_init(void)
	{
	unsigned long i;
	unsigned char j;
	static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;

	/* Init: no FLASHes known */
	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++){
	flash_info_t * const pflinfo = &flash_info[i];
	pflinfo->flash_id = FLASH_UNKNOWN;
	pflinfo->size = 0;
	pflinfo->sector_count = 0;
	}

	/* Enable writes to Hydra/Argus flash */
	{
	register unsigned int temp;
	CONFIG_READ_WORD(PICR1,temp);
	temp \|= PICR1_FLASH_WR_EN;
	CONFIG_WRITE_WORD(PICR1,temp);
	}

	for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++){
	flash_info_t * const pflinfo = &flash_info[i];
	const unsigned long base_address = flash_banks[i];
	volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;

	/* write autoselect sequence */
	flash[0x5555] = 0xaa;
	flash[0x2aaa] = 0x55;
	flash[0x5555] = 0x90;
	__asm__ __volatile__("sync");

	pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);

	switch(pflinfo->flash_id & FLASH_TYPEMASK){
	case FLASH_AM033:
	pflinfo->size = 0x00200000;
	pflinfo->sector_count = 64;
	for(j = 0; j < 64; j++){
	pflinfo->start[j] = base_address + 0x00010000 * j;
	pflinfo->protect[j] = flash[(j << 16) \| 0x2];
	}
	break;
	case FLASH_AM065:
	pflinfo->size = 0x00800000;
	pflinfo->sector_count =128;
	for(j = 0; j < 128; j++){
	pflinfo->start[j] = base_address + 0x00010000 * j;
	pflinfo->protect[j] = flash[(j << 16) \| 0x2];
	}
	break;
	case FLASH_AT040:
	pflinfo->size = 0x00080000;
	pflinfo->sector_count = 2;
	pflinfo->start[0] = base_address ;
	pflinfo->start[1] = base_address + 0x00004000;
	pflinfo->protect[0] = ((flash[0x02] & 0X01)==0) ? 0X02 : 0X01;
	pflinfo->protect[1] = 0X02;
	break;
	case FLASH_AM040:
	pflinfo->size = 0x00080000;
	pflinfo->sector_count = 8;
	for(j = 0; j < 8; j++){
	pflinfo->start[j] = base_address + 0x00010000 * j;
	pflinfo->protect[j] = flash[(j << 16) \| 0x2];
	}
	break;
	case FLASH_STM800AB:
	pflinfo->size = 0x00100000;
	pflinfo->sector_count = 19;
	pflinfo->start[0] = base_address;
	pflinfo->start[1] = base_address + 0x4000;
	pflinfo->start[2] = base_address + 0x6000;
	pflinfo->start[3] = base_address + 0x8000;
	for(j = 1; j < 16; j++){
	pflinfo->start[j+3] = base_address + 0x00010000 * j;
	}
	break;
	}
	/* Protect monitor and environment sectors */
	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
	&flash_info[0]);
	#endif

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

	/* reset device to read mode */
	flash[0x0000] = 0xf0;
	__asm__ __volatile__("sync");
	}

	return flash_info[0].size + flash_info[1].size;
	}

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info(flash_info_t *info)
	{
	static const char unk[] = "Unknown";
	const char mfct = unk, type = unk;
	unsigned int i;

	if(info->flash_id != FLASH_UNKNOWN){
	switch(info->flash_id & FLASH_VENDMASK){
	case FLASH_MAN_ATM:
	mfct = "Atmel";
	break;
	case FLASH_MAN_AMD:
	mfct = "AMD";
	break;
	case FLASH_MAN_FUJ:
	mfct = "FUJITSU";
	break;
	case FLASH_MAN_STM:
	mfct = "STM";
	break;
	case FLASH_MAN_SST:
	mfct = "SST";
	break;
	case FLASH_MAN_BM:
	mfct = "Bright Microelectonics";
	break;
	case FLASH_MAN_INTEL:
	mfct = "Intel";
	break;
	}

	switch(info->flash_id & FLASH_TYPEMASK){
	case FLASH_AT040:
	type = "AT49LV040 (512K * 8, uniform sector size)";
	break;
	case FLASH_AM033:
	type = "AM29F033C (4 Mbit * 8, uniform sector size)";
	break;
	case FLASH_AM040:
	type = "AM29F040B (512K * 8, uniform sector size)";
	break;
	case FLASH_AM065:
	type = "AM29F0465D ( 8 MBit * 8, uniform sector size) or part of AM29F652D( 16 MB)";
	break;
	case FLASH_AM400B:
	type = "AM29LV400B (4 Mbit, bottom boot sect)";
	break;
	case FLASH_AM400T:
	type = "AM29LV400T (4 Mbit, top boot sector)";
	break;
	case FLASH_AM800B:
	type = "AM29LV800B (8 Mbit, bottom boot sect)";
	break;
	case FLASH_AM800T:
	type = "AM29LV800T (8 Mbit, top boot sector)";
	break;
	case FLASH_AM160T:
	type = "AM29LV160T (16 Mbit, top boot sector)";
	break;
	case FLASH_AM320B:
	type = "AM29LV320B (32 Mbit, bottom boot sect)";
	break;
	case FLASH_AM320T:
	type = "AM29LV320T (32 Mbit, top boot sector)";
	break;
	case FLASH_STM800AB:
	type = "M29W800AB (8 Mbit, bottom boot sect)";
	break;
	case FLASH_SST800A:
	type = "SST39LF/VF800 (8 Mbit, uniform sector size)";
	break;
	case FLASH_SST160A:
	type = "SST39LF/VF160 (16 Mbit, uniform sector size)";
	break;
	}
	}

	printf(
	"\n Brand: %s Type: %s\n"
	" Size: %lu KB in %d Sectors\n",
	mfct,
	type,
	info->size >> 10,
	info->sector_count
	);

	printf (" Sector Start Addresses:");

	for (i = 0; i < info->sector_count; i++){
	unsigned long size;
	unsigned int erased;
	unsigned long * flash = (unsigned long *) info->start[i];

	/*
	* Check if whole sector is erased
	*/
	size =
	(i != (info->sector_count - 1)) ?
	(info->start[i + 1] - info->start[i]) >> 2 :
	(info->start[0] + info->size - info->start[i]) >> 2;

	for(
	flash = (unsigned long *) info->start[i], erased = 1;
	(flash != (unsigned long *) info->start[i] + size) && erased;
	flash++
	){
	erased = *flash == ~0x0UL;
	}

	printf(
	"%s %08lX %s %s",
	(i % 5) ? "" : "\n ",
	info->start[i],
	erased ? "E" : " ",
	info->protect[i] ? "RO" : " "
	);
	}

	puts("\n");
	return;
	}

	int flash_erase(flash_info_t *info, int s_first, int s_last)
	{
	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, last;
	unsigned char sh8b;

	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_MAN_STM \| FLASH_AMD_COMP))) {
	printf ("Can't erase unknown flash type - aborted\n");
	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;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START)){
	sh8b = 3;
	}
	else{
	sh8b = 0;
	}

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (FLASH_WORD_SIZE *)(info->start[0] + (
	(info->start[sect] - info->start[0]) << sh8b));
	if (info->flash_id & FLASH_MAN_SST){
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr[0] = (FLASH_WORD_SIZE)0x00500050; /* block erase */
	udelay(30000); /* wait 30 ms */
	}
	else
	addr[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
	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;
	addr = (FLASH_WORD_SIZE *)(info->start[0] + (
	(info->start[l_sect] - info->start[0]) << sh8b));
	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
	if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf ("Timeout\n");
	return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	serial_putc ('.');
	last = now;
	}
	}

	DONE:
	/* reset to read mode */
	addr = (FLASH_WORD_SIZE *)info->start[0];
	addr[0] = (FLASH_WORD_SIZE)0x00F000F0; /* 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)
	{
	ulong cp, wp, data;
	int i, l, rc;

	wp = (addr & ~3); /* get lower word aligned address */

	/*
	* 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<4 && cnt>0; ++i) {
	data = (data << 8) \| *src++;
	--cnt;
	++cp;
	}
	for (; cnt==0 && i<4; ++i, ++cp) {
	data = (data << 8) \| ((uchar )cp);
	}

	if ((rc = write_word(info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = 0;
	for (i=0; i<4; ++i) {
	data = (data << 8) \| *src++;
	}
	if ((rc = write_word(info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	cnt -= 4;
	}

	if (cnt == 0) {
	return (0);
	}

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
	data = (data << 8) \| *src++;
	--cnt;
	}
	for (; i<4; ++i, ++cp) {
	data = (data << 8) \| ((uchar )cp);
	}

	return (write_word(info, wp, data));
	}

	/*-----------------------------------------------------------------------
	* 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)
	{
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE )info->start[0];
	volatile FLASH_WORD_SIZE *dest2;
	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE )&data;
	ulong start;
	int flag;
	int i;
	unsigned char sh8b;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START)){
	sh8b = 3;
	}
	else{
	sh8b = 0;
	}

	dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
	info->start[0]);

	/* Check if Flash is (sufficiently) erased */
	if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
	return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++){
	addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;

	dest2[i << sh8b] = data2[i];

	/* re-enable interrupts if necessary */
	if (flag){
	enable_interrupts();
	}

	/* data polling for D7 */
	start = get_timer (0);
	while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
	(data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	}

	return (0);
	}

	/----------------------------------------------------------------------- /