board/netstal/common/hcu_flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2000-2004
  * 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 <ppc4xx.h>
 #include <asm/processor.h>

 #if CFG_MAX_FLASH_BANKS != 1
 #error "CFG_MAX_FLASH_BANKS must be 1"
 #endif
 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];	/* info for FLASH chips	*/

 /*-----------------------------------------------------------------------
  * Functions
  */
 static ulong flash_get_size (vu_long * addr, 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);

 #define ADDR0		0x5555
 #define ADDR1		0x2aaa
 #define FLASH_WORD_SIZE unsigned char

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

 unsigned long flash_init (void)
 {
 	unsigned long size_b0;

 	/* Init: no FLASHes known */
 	flash_info[0].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);
 	}

 	/* Only one bank */
 	/* Setup offsets */
 	flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);

 	/* Monitor protection ON by default */
 	(void) flash_protect (FLAG_PROTECT_SET,
 			      FLASH_BASE0_PRELIM,
 			      FLASH_BASE0_PRELIM + monitor_flash_len - 1,
 			      &flash_info[0]);
 	flash_info[0].size = size_b0;

 	return size_b0;
 }


 /*-----------------------------------------------------------------------*/
 /*
  * This implementation assumes that the flash chips are uniform sector
  * devices. This is true for all likely flash devices on a HCUx.
  */
 static void flash_get_offsets (ulong base, flash_info_t * info)
 {
 	unsigned idx;
 	unsigned long sector_size = info->size / info->sector_count;

 	for (idx = 0; idx < info->sector_count; idx += 1) {
 		info->start[idx] = base + (idx * sector_size);
 	}
 }

 /*-----------------------------------------------------------------------*/
 void flash_print_info (flash_info_t * info)
 {
 	int i;
 	int k;
 	int size;
 	int erased;
 	volatile unsigned long *flash;

 	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_SST:
 		printf ("SST ");
 		break;
 	case FLASH_MAN_STM:
 		printf ("ST Micro ");
 		break;
 	default:
 		printf ("Unknown Vendor ");
 		break;
 	}

 	  /* (Reduced table of only parts expected in HCUx boards.) */
 	switch (info->flash_id) {
 	case FLASH_MAN_AMD | FLASH_AM040:
 		printf ("AM29F040 (512 Kbit, uniform sector size)\n");
 		break;
 	case FLASH_MAN_STM | FLASH_AM040:
 		printf ("MM29W040W (512 Kbit, uniform sector size)\n");
 		break;
 	default:
 		printf ("Unknown Chip Type\n");
 		break;
 	}

 	printf ("  Size: %ld KB in %d Sectors\n",
 		info->size >> 10, info->sector_count);

 	printf ("  Sector Start Addresses:");
 	for (i = 0; i < info->sector_count; ++i) {
 		/*
 		 * Check if whole sector is erased
 		 */
 		if (i != (info->sector_count - 1))
 			size = info->start[i + 1] - info->start[i];
 		else
 			size = info->start[0] + info->size - info->start[i];
 		erased = 1;
 		flash = (volatile unsigned long *) info->start[i];
 		size = size >> 2;	/* divide by 4 for longword access */
 		for (k = 0; k < size; k++) {
 			if (*flash++ != 0xffffffff) {
 				erased = 0;
 				break;
 			}
 		}

 		if ((i % 5) == 0)
 			printf ("\n   ");
 		printf (" %08lX%s%s",
 			info->start[i],
 			erased ? " E" : "  ", info->protect[i] ? "RO " : "   "
 		);
 	}
 	printf ("\n");
 	return;
 }

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

 /*
  * The following code cannot be run from FLASH!
  */
 static ulong flash_get_size (vu_long * addr, flash_info_t * info)
 {
 	short i;
 	FLASH_WORD_SIZE value;
 	ulong base = (ulong) addr;
 	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;

 	/* Write auto select command: read Manufacturer ID */
 	asm("isync");
 	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 	asm("isync");
 	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 	asm("isync");
 	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00900090;
 	asm("isync");

 	value = addr2[0];
 	asm("isync");

 	switch (value) {
 	case (FLASH_WORD_SIZE) AMD_MANUFACT:
 		info->flash_id = FLASH_MAN_AMD;
 		break;
 	case (FLASH_WORD_SIZE) FUJ_MANUFACT:
 		info->flash_id = FLASH_MAN_FUJ;
 		break;
 	case (FLASH_WORD_SIZE) SST_MANUFACT:
 		info->flash_id = FLASH_MAN_SST;
 		break;
 	case (FLASH_WORD_SIZE)STM_MANUFACT:
 		info->flash_id = FLASH_MAN_STM;
 		break;
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		printf("Unknown flash manufacturer code: 0x%x at %p\n",
 		       value, addr);
 		addr2[ADDR0] = (FLASH_WORD_SIZE) 0;
 		return (0);	/* no or unknown flash  */
 	}

 	value = addr2[1];	/* device ID		*/

 	switch (value) {
 	case (FLASH_WORD_SIZE) AMD_ID_F040B:
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x0080000;	/* => 512 ko */
 		break;
 	case (FLASH_WORD_SIZE) AMD_ID_LV040B:
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x0080000;	/* => 512 ko */
 		break;
 	case (FLASH_WORD_SIZE)STM_ID_M29W040B: /* most likele HCU5 chip */
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x0080000; /* => 512 ko */
 		break;
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		return (0);	/* => no or unknown flash */

 	}

 	  /* Calculate the sector offsets (Use HCUx Optimized code). */
 	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
 		 */
 		addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 			info->protect[i] = 0;
 		else
 			info->protect[i] = addr2[2] & 1;
 	}

 	/*
 	 * Prevent writes to uninitialized FLASH.
 	 */
 	if (info->flash_id != FLASH_UNKNOWN) {
 		addr2 = (FLASH_WORD_SIZE *) info->start[0];
 		*addr2 = (FLASH_WORD_SIZE) 0x00F000F0;	/* reset bank */
 	}

 	return (info->size);
 }

 int wait_for_DQ7 (flash_info_t * info, int sect)
 {
 	ulong start, now, last;
 	volatile FLASH_WORD_SIZE *addr =
 		(FLASH_WORD_SIZE *) (info->start[sect]);

 	start = get_timer (0);
 	last = start;
 	while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
 	       (FLASH_WORD_SIZE) 0x00800080) {
 		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;
 		}
 	}
 	return 0;
 }

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

 int flash_erase (flash_info_t * info, int s_first, int s_last)
 {
 	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
 	volatile FLASH_WORD_SIZE *addr2;
 	int flag, prot, sect, l_sect;
 	int i;

 	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) {
 		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 not erased!\n",
 			prot);
 	} else {
 		printf ("\n");
 	}

 	l_sect = -1;

 	/* 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 */
 			addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
 			printf ("Erasing sector %p\n", addr2);	/* CLH */

 			if ((info->flash_id & FLASH_VENDMASK) ==
 			    FLASH_MAN_SST) {
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				/* block erase */
 				addr2[0] = (FLASH_WORD_SIZE) 0x00500050;
 				for (i = 0; i < 50; i++) udelay (1000);
 			} else {
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				/* sector erase */
 				addr2[0] = (FLASH_WORD_SIZE) 0x00300030;
 			}
 			l_sect = sect;
 			/*
 			 * Wait for each sector to complete, it's more
 			 * reliable.  According to AMD Spec, you must
 			 * issue all erase commands within a specified
 			 * timeout.  This has been seen to fail, especially
 			 * if printf()s are included (for debug)!!
 			 */
 			wait_for_DQ7 (info, 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;
 	wait_for_DQ7 (info, l_sect);

 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 = (FLASH_WORD_SIZE *) dest;
 	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 	ulong start;
 	int i;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*((volatile FLASH_WORD_SIZE *) dest) &
 	    (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 		return (2);
 	}

 	for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 		int flag;

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

 		addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 		addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 		addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;

 		dest2[i] = data2[i];

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

 		/* data polling for D7 */
 		start = get_timer (0);
 		while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 		       (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {

 			if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
 				return (1);
 			}
 		}
 	}

 	return (0);
 }
	/*
	* (C) Copyright 2000-2004
	* 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 <ppc4xx.h>
	#include <asm/processor.h>

	#if CFG_MAX_FLASH_BANKS != 1
	#error "CFG_MAX_FLASH_BANKS must be 1"
	#endif
	flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */

	/*-----------------------------------------------------------------------
	* Functions
	*/
	static ulong flash_get_size (vu_long * addr, 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);

	#define ADDR0 0x5555
	#define ADDR1 0x2aaa
	#define FLASH_WORD_SIZE unsigned char

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

	unsigned long flash_init (void)
	{
	unsigned long size_b0;

	/* Init: no FLASHes known */
	flash_info[0].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);
	}

	/* Only one bank */
	/* Setup offsets */
	flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);

	/* Monitor protection ON by default */
	(void) flash_protect (FLAG_PROTECT_SET,
	FLASH_BASE0_PRELIM,
	FLASH_BASE0_PRELIM + monitor_flash_len - 1,
	&flash_info[0]);
	flash_info[0].size = size_b0;

	return size_b0;
	}


	/-----------------------------------------------------------------------/
	/*
	* This implementation assumes that the flash chips are uniform sector
	* devices. This is true for all likely flash devices on a HCUx.
	*/
	static void flash_get_offsets (ulong base, flash_info_t * info)
	{
	unsigned idx;
	unsigned long sector_size = info->size / info->sector_count;

	for (idx = 0; idx < info->sector_count; idx += 1) {
	info->start[idx] = base + (idx * sector_size);
	}
	}

	/-----------------------------------------------------------------------/
	void flash_print_info (flash_info_t * info)
	{
	int i;
	int k;
	int size;
	int erased;
	volatile unsigned long *flash;

	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_SST:
	printf ("SST ");
	break;
	case FLASH_MAN_STM:
	printf ("ST Micro ");
	break;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	/* (Reduced table of only parts expected in HCUx boards.) */
	switch (info->flash_id) {
	case FLASH_MAN_AMD \| FLASH_AM040:
	printf ("AM29F040 (512 Kbit, uniform sector size)\n");
	break;
	case FLASH_MAN_STM \| FLASH_AM040:
	printf ("MM29W040W (512 Kbit, uniform sector size)\n");
	break;
	default:
	printf ("Unknown Chip Type\n");
	break;
	}

	printf (" Size: %ld KB in %d Sectors\n",
	info->size >> 10, info->sector_count);

	printf (" Sector Start Addresses:");
	for (i = 0; i < info->sector_count; ++i) {
	/*
	* Check if whole sector is erased
	*/
	if (i != (info->sector_count - 1))
	size = info->start[i + 1] - info->start[i];
	else
	size = info->start[0] + info->size - info->start[i];
	erased = 1;
	flash = (volatile unsigned long *) info->start[i];
	size = size >> 2; /* divide by 4 for longword access */
	for (k = 0; k < size; k++) {
	if (*flash++ != 0xffffffff) {
	erased = 0;
	break;
	}
	}

	if ((i % 5) == 0)
	printf ("\n ");
	printf (" %08lX%s%s",
	info->start[i],
	erased ? " E" : " ", info->protect[i] ? "RO " : " "
	);
	}
	printf ("\n");
	return;
	}

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

	/*
	* The following code cannot be run from FLASH!
	*/
	static ulong flash_get_size (vu_long * addr, flash_info_t * info)
	{
	short i;
	FLASH_WORD_SIZE value;
	ulong base = (ulong) addr;
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE ) addr;

	/* Write auto select command: read Manufacturer ID */
	asm("isync");
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	asm("isync");
	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	asm("isync");
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00900090;
	asm("isync");

	value = addr2[0];
	asm("isync");

	switch (value) {
	case (FLASH_WORD_SIZE) AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
	case (FLASH_WORD_SIZE) FUJ_MANUFACT:
	info->flash_id = FLASH_MAN_FUJ;
	break;
	case (FLASH_WORD_SIZE) SST_MANUFACT:
	info->flash_id = FLASH_MAN_SST;
	break;
	case (FLASH_WORD_SIZE)STM_MANUFACT:
	info->flash_id = FLASH_MAN_STM;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	printf("Unknown flash manufacturer code: 0x%x at %p\n",
	value, addr);
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0;
	return (0); /* no or unknown flash */
	}

	value = addr2[1]; /* device ID */

	switch (value) {
	case (FLASH_WORD_SIZE) AMD_ID_F040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x0080000; /* => 512 ko */
	break;
	case (FLASH_WORD_SIZE) AMD_ID_LV040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x0080000; /* => 512 ko */
	break;
	case (FLASH_WORD_SIZE)STM_ID_M29W040B: /* most likele HCU5 chip */
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x0080000; /* => 512 ko */
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* => no or unknown flash */

	}

	/* Calculate the sector offsets (Use HCUx Optimized code). */
	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
	*/
	addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
	info->protect[i] = 0;
	else
	info->protect[i] = addr2[2] & 1;
	}

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	addr2 = (FLASH_WORD_SIZE *) info->start[0];
	addr2 = (FLASH_WORD_SIZE) 0x00F000F0; / reset bank */
	}

	return (info->size);
	}

	int wait_for_DQ7 (flash_info_t * info, int sect)
	{
	ulong start, now, last;
	volatile FLASH_WORD_SIZE *addr =
	(FLASH_WORD_SIZE *) (info->start[sect]);

	start = get_timer (0);
	last = start;
	while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
	(FLASH_WORD_SIZE) 0x00800080) {
	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;
	}
	}
	return 0;
	}

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

	int flash_erase (flash_info_t * info, int s_first, int s_last)
	{
	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE ) (info->start[0]);
	volatile FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;
	int i;

	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) {
	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 not erased!\n",
	prot);
	} else {
	printf ("\n");
	}

	l_sect = -1;

	/* 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 */
	addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
	printf ("Erasing sector %p\n", addr2); /* CLH */

	if ((info->flash_id & FLASH_VENDMASK) ==
	FLASH_MAN_SST) {
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	/* block erase */
	addr2[0] = (FLASH_WORD_SIZE) 0x00500050;
	for (i = 0; i < 50; i++) udelay (1000);
	} else {
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	/* sector erase */
	addr2[0] = (FLASH_WORD_SIZE) 0x00300030;
	}
	l_sect = sect;
	/*
	* Wait for each sector to complete, it's more
	* reliable. According to AMD Spec, you must
	* issue all erase commands within a specified
	* timeout. This has been seen to fail, especially
	* if printf()s are included (for debug)!!
	*/
	wait_for_DQ7 (info, 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;
	wait_for_DQ7 (info, l_sect);

	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 = (FLASH_WORD_SIZE ) dest;
	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE ) & data;
	ulong start;
	int i;

	/* Check if Flash is (sufficiently) erased */
	if ((((volatile FLASH_WORD_SIZE ) dest) &
	(FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
	return (2);
	}

	for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
	int flag;

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

	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;

	dest2[i] = data2[i];

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

	/* data polling for D7 */
	start = get_timer (0);
	while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
	(data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {

	if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	}

	return (0);
	}