board/eltec/elppc/flash.c - uboot/qsr1000 - Git at Google

 /*
  * (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
  */

 /*
  * 07-10-2002 Frank Gottschling: added 29F032 flash (ELPPC).
  *        fixed monitor protection part
  *
  * 09-18-2001 Andreas Heppel: Reduced the code in here to the usage
  *        of AMD's 29F040 and 29F016 flashes, since the BAB7xx does use
  *        any other.
  */

 #include <common.h>
 #include <asm/processor.h>
 #include <asm/pci_io.h>

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

 ulong flash_get_size (vu_long *addr, flash_info_t *info);
 static int write_word (flash_info_t *info, ulong dest, ulong data);

 /*flash command address offsets*/

 #define ADDR0           (0x555)
 #define ADDR1           (0x2AA)
 #define ADDR3           (0x001)

 #define FLASH_WORD_SIZE unsigned char

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

 unsigned long flash_init (void)
 {
     unsigned long size1, size2;
     int i;

     /* Init: no FLASHes known */
     for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i)
     {
 	flash_info[i].flash_id = FLASH_UNKNOWN;
     }

     /* initialise 1st flash */
     size1 = 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",
 	    size1, size1<<20);
     }

     /* initialise 2nd flash */
     size2 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);

     if (flash_info[1].flash_id == FLASH_UNKNOWN)
     {
 	printf ("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
 	    size2, size2<<20);
     }

     /* monitor protection ON by default */
     if (size1 == 512*1024)
     {
 	(void)flash_protect(FLAG_PROTECT_SET,
 		FLASH_BASE0_PRELIM,
 		FLASH_BASE0_PRELIM+monitor_flash_len-1,
 		&flash_info[0]);
     }
     if (size2 == 512*1024)
     {
 	(void)flash_protect(FLAG_PROTECT_SET,
 		FLASH_BASE1_PRELIM,
 		FLASH_BASE1_PRELIM+monitor_flash_len-1,
 		&flash_info[1]);
     }
     if (size2 == 4*1024*1024)
     {
 	(void)flash_protect(FLAG_PROTECT_SET,
 		CONFIG_SYS_FLASH_BASE,
 		CONFIG_SYS_FLASH_BASE+monitor_flash_len-1,
 		&flash_info[1]);
     }

     return (size1 + size2);
 }

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

 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");
 	flash_init();
     }

     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;
     default:
 	printf ("Unknown Vendor ");
 	break;
     }

     switch (info->flash_id & FLASH_TYPEMASK) {
     case AMD_ID_F040B:
 	printf ("AM29F040B (4 Mbit)\n");
 	break;
     case AMD_ID_F016D:
 	printf ("AM29F016D (16 Mbit)\n");
 	break;
     case AMD_ID_F032B:
 	printf ("AM29F032B (32 Mbit)\n");
 	break;
    default:
 	printf ("Unknown Chip Type\n");
 	break;
     }

     if (info->size >= (1 << 20)) {
 	printf ("  Size: %ld MB in %d Sectors\n", info->size >> 20, info->sector_count);
     } else {
 	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");
 }

 /*----------------------------------------------------------------------------*/
 /*
  * The following code cannot be run from FLASH!
  */
 ulong flash_get_size (vu_long *addr, flash_info_t *info)
 {
     short i;
     ulong vendor, devid;
     ulong base = (ulong)addr;
     volatile unsigned char *caddr = (unsigned char *)addr;

 #ifdef DEBUG
     printf("flash_get_size for address 0x%lx: \n", (unsigned long)caddr);
 #endif

     /* Write auto select command: read Manufacturer ID */
     caddr[0] = 0xF0;   /* reset bank */
     udelay(10);

     eieio();
     caddr[0x555] = 0xAA;
     udelay(10);
     caddr[0x2AA] = 0x55;
     udelay(10);
     caddr[0x555] = 0x90;

     udelay(10);

     vendor = caddr[0];
     devid = caddr[1];

 #ifdef DEBUG
     printf("Manufacturer: 0x%lx\n", vendor);
 #endif

     vendor &= 0xff;
     devid &= 0xff;

     /* We accept only two AMD types */
     switch (vendor) {
     case (FLASH_WORD_SIZE)AMD_MANUFACT:
 	info->flash_id = FLASH_MAN_AMD;
 	break;
     default:
 	info->flash_id = FLASH_UNKNOWN;
 	info->sector_count = 0;
 	info->size = 0;
 	return (0);         /* no or unknown flash  */
     }

     switch (devid) {
     case (FLASH_WORD_SIZE)AMD_ID_F040B:
 	info->flash_id |= AMD_ID_F040B;
 	info->sector_count = 8;
 	info->size = 0x00080000;
 	break;              /* => 0.5 MB      */

     case (FLASH_WORD_SIZE)AMD_ID_F016D:
 	info->flash_id |= AMD_ID_F016D;
 	info->sector_count = 32;
 	info->size         = 0x00200000;
 	break;              /* => 2 MB      */

     case (FLASH_WORD_SIZE)AMD_ID_F032B:
 	info->flash_id |= AMD_ID_F032B;
 	info->sector_count = 64;
 	info->size         = 0x00400000;
 	break;              /* => 4 MB      */

     default:
 	info->flash_id = FLASH_UNKNOWN;
 	return (0);         /* => no or unknown flash */

     }

 #ifdef DEBUG
     printf("flash id 0x%lx; sector count 0x%x, size 0x%lx\n", info->flash_id, info->sector_count, info->size);
 #endif

     /* check for protected sectors */
     for (i = 0; i < info->sector_count; i++) {
 	/* sector base address */
 	info->start[i] = base + i * (info->size / info->sector_count);
 	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
 	/* D0 = 1 if protected */
 	caddr = (volatile unsigned char *)(info->start[i]);
 	info->protect[i] = caddr[2] & 1;
     }

     /*
      * Prevent writes to uninitialized FLASH.
      */
     if (info->flash_id != FLASH_UNKNOWN) {
 	caddr = (volatile unsigned char *)info->start[0];
 	caddr[0] = 0xF0;   /* reset bank */
     }

     return (info->size);
 }

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

 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;
     int rc = 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;
     }

     if ((info->flash_id == FLASH_UNKNOWN) ||
 	(info->flash_id > 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;

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

     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;

     /* 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[sect]);
 	    if (info->flash_id & 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;
 		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[l_sect]);
     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 rc;
 }

 /*----------------------------------------------------------------------------*/
 /*
  * 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 flag;
 	int i;

     /* Check if Flash is (sufficiently) erased */
     if ((*((volatile FLASH_WORD_SIZE *)dest) &
 	     (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] = (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) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 		return (1);
 	      }
 	    }
 	  }

     return (0);
 }

 /*----------------------------------------------------------------------------*/
	/*
	* (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
	*/

	/*
	* 07-10-2002 Frank Gottschling: added 29F032 flash (ELPPC).
	* fixed monitor protection part
	*
	* 09-18-2001 Andreas Heppel: Reduced the code in here to the usage
	* of AMD's 29F040 and 29F016 flashes, since the BAB7xx does use
	* any other.
	*/

	#include <common.h>
	#include <asm/processor.h>
	#include <asm/pci_io.h>

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

	ulong flash_get_size (vu_long addr, flash_info_t info);
	static int write_word (flash_info_t *info, ulong dest, ulong data);

	/flash command address offsets/

	#define ADDR0 (0x555)
	#define ADDR1 (0x2AA)
	#define ADDR3 (0x001)

	#define FLASH_WORD_SIZE unsigned char

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

	unsigned long flash_init (void)
	{
	unsigned long size1, size2;
	int i;

	/* Init: no FLASHes known */
	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i)
	{
	flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	/* initialise 1st flash */
	size1 = 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",
	size1, size1<<20);
	}

	/* initialise 2nd flash */
	size2 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);

	if (flash_info[1].flash_id == FLASH_UNKNOWN)
	{
	printf ("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
	size2, size2<<20);
	}

	/* monitor protection ON by default */
	if (size1 == 512*1024)
	{
	(void)flash_protect(FLAG_PROTECT_SET,
	FLASH_BASE0_PRELIM,
	FLASH_BASE0_PRELIM+monitor_flash_len-1,
	&flash_info[0]);
	}
	if (size2 == 512*1024)
	{
	(void)flash_protect(FLAG_PROTECT_SET,
	FLASH_BASE1_PRELIM,
	FLASH_BASE1_PRELIM+monitor_flash_len-1,
	&flash_info[1]);
	}
	if (size2 == 410241024)
	{
	(void)flash_protect(FLAG_PROTECT_SET,
	CONFIG_SYS_FLASH_BASE,
	CONFIG_SYS_FLASH_BASE+monitor_flash_len-1,
	&flash_info[1]);
	}

	return (size1 + size2);
	}

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

	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");
	flash_init();
	}

	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;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case AMD_ID_F040B:
	printf ("AM29F040B (4 Mbit)\n");
	break;
	case AMD_ID_F016D:
	printf ("AM29F016D (16 Mbit)\n");
	break;
	case AMD_ID_F032B:
	printf ("AM29F032B (32 Mbit)\n");
	break;
	default:
	printf ("Unknown Chip Type\n");
	break;
	}

	if (info->size >= (1 << 20)) {
	printf (" Size: %ld MB in %d Sectors\n", info->size >> 20, info->sector_count);
	} else {
	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");
	}

	/----------------------------------------------------------------------------/
	/*
	* The following code cannot be run from FLASH!
	*/
	ulong flash_get_size (vu_long addr, flash_info_t info)
	{
	short i;
	ulong vendor, devid;
	ulong base = (ulong)addr;
	volatile unsigned char caddr = (unsigned char )addr;

	#ifdef DEBUG
	printf("flash_get_size for address 0x%lx: \n", (unsigned long)caddr);
	#endif

	/* Write auto select command: read Manufacturer ID */
	caddr[0] = 0xF0; /* reset bank */
	udelay(10);

	eieio();
	caddr[0x555] = 0xAA;
	udelay(10);
	caddr[0x2AA] = 0x55;
	udelay(10);
	caddr[0x555] = 0x90;

	udelay(10);

	vendor = caddr[0];
	devid = caddr[1];

	#ifdef DEBUG
	printf("Manufacturer: 0x%lx\n", vendor);
	#endif

	vendor &= 0xff;
	devid &= 0xff;

	/* We accept only two AMD types */
	switch (vendor) {
	case (FLASH_WORD_SIZE)AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}

	switch (devid) {
	case (FLASH_WORD_SIZE)AMD_ID_F040B:
	info->flash_id \|= AMD_ID_F040B;
	info->sector_count = 8;
	info->size = 0x00080000;
	break; /* => 0.5 MB */

	case (FLASH_WORD_SIZE)AMD_ID_F016D:
	info->flash_id \|= AMD_ID_F016D;
	info->sector_count = 32;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case (FLASH_WORD_SIZE)AMD_ID_F032B:
	info->flash_id \|= AMD_ID_F032B;
	info->sector_count = 64;
	info->size = 0x00400000;
	break; /* => 4 MB */

	default:
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* => no or unknown flash */

	}

	#ifdef DEBUG
	printf("flash id 0x%lx; sector count 0x%x, size 0x%lx\n", info->flash_id, info->sector_count, info->size);
	#endif

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
	/* sector base address */
	info->start[i] = base + i * (info->size / info->sector_count);
	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	caddr = (volatile unsigned char *)(info->start[i]);
	info->protect[i] = caddr[2] & 1;
	}

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	caddr = (volatile unsigned char *)info->start[0];
	caddr[0] = 0xF0; /* reset bank */
	}

	return (info->size);
	}

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

	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;
	int rc = 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;
	}

	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	(info->flash_id > 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;

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

	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;

	/* 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[sect]);
	if (info->flash_id & 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;
	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[l_sect]);
	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 rc;
	}

	/----------------------------------------------------------------------------/
	/*
	* 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 flag;
	int i;

	/* Check if Flash is (sufficiently) erased */
	if ((((volatile FLASH_WORD_SIZE )dest) &
	(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] = (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) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	}

	return (0);
	}

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