/*
 * (C) Copyright 2001
 * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
 *
 * (C) Copyright 2004
 * Conn Clark, Electronic Systems Technology USA, clark@esteem.com
 *
 * 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>

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


/*-----------------------------------------------------------------------
 * Functions
 */
ulong flash_get_size (vu_long * addr, flash_info_t * info);
void flash_get_offsets (ulong base, flash_info_t * info);

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

unsigned long flash_init (void)
{
	unsigned long size_b0;
	int i;
	uint pbcr;
	unsigned long base_b0;
	int size_val = 0;

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

	/* Static FLASH Bank configuration here - FIXME XXX */

	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
			size_b0, size_b0<<20);
	}

	/* Setup offsets */
	flash_get_offsets (-size_b0, &flash_info[0]);

	/* Re-do sizing to get full correct info */
	mtdcr(ebccfga, pb0cr);
	pbcr = mfdcr(ebccfgd);
	mtdcr(ebccfga, pb0cr);
	base_b0 = -size_b0;
	switch (size_b0) {
	case 1 << 20:
		size_val = 0;
		break;
	case 2 << 20:
		size_val = 1;
		break;
	case 4 << 20:
		size_val = 2;
		break;
	case 8 << 20:
		size_val = 3;
		break;
	case 16 << 20:
		size_val = 4;
		break;
	}
	pbcr = (pbcr & 0x0001ffff) | base_b0 | (size_val << 17);
	mtdcr(ebccfgd, pbcr);

	/* Monitor protection ON by default */
	(void)flash_protect(FLAG_PROTECT_SET,
			    -CFG_MONITOR_LEN,
			    0xffffffff,
			    &flash_info[0]);

	flash_info[0].size = size_b0;

	return (size_b0);
}


/*-----------------------------------------------------------------------
 */
void flash_get_offsets (ulong base, flash_info_t *info)
{
	int i;
	short n;

	/* set up sector start address table */
	if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV320MB) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV640MB)) {
		/* set sector offsets for bottom boot block type	*/
		for (i=0; i<8; ++i) {		/*  8 x 8k boot sectors	*/
			info->start[i] = base;
			base += 8 << 10;
		}
		while (i < info->sector_count) {	/* 64k regular sectors	*/
			info->start[i] = base;
			base += 64 << 10;
			++i;
		}
	} else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV320MT) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV640MT)) {
		/* set sector offsets for top boot block type		*/
		base += info->size;
		i = info->sector_count;
		for (n=0; n<8; ++n) {		/*  8 x 8k boot sectors	*/
			base -= 8 << 10;
			--i;
			info->start[i] = base;
		}
		while (i > 0) {			/* 64k regular sectors	*/
			base -= 64 << 10;
			--i;
			info->start[i] = base;
		}
	} else {
	    if (info->flash_id & FLASH_BTYPE) {
		/* set sector offsets for bottom boot block type	*/
		info->start[0] = base + 0x00000000;
		info->start[1] = base + 0x00004000;
		info->start[2] = base + 0x00006000;
		info->start[3] = base + 0x00008000;
		for (i = 4; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00010000) - 0x00030000;
		}
	    } else {
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		info->start[i--] = base + info->size - 0x00004000;
		info->start[i--] = base + info->size - 0x00006000;
		info->start[i--] = base + info->size - 0x00008000;
		for (; i >= 0; i--) {
			info->start[i] = base + i * 0x00010000;
		}
	    }
	}
}

/*-----------------------------------------------------------------------
 */
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;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AMLV320MT:	printf ("AM29LV320MT (32 M, top sector)\n");
				break;
	case FLASH_AMLV320MB:	printf ("AM29LV320MB (32 M, bottom sector)\n");
				break;
	case FLASH_AMLV640MT:	printf ("AM29LV640MT (64 M, top boot sector)\n");
				break;
	case FLASH_AMLV640MB:	printf ("AM29LV640MB (64 M, bottom boot sector)\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				break;
	}

	printf ("  Size: %ld MB in %d Sectors\n",
		info->size >> 20, info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
#ifdef CFG_FLASH_EMPTY_INFO
		/*
		 * 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   ");
		/* print empty and read-only info */
		printf (" %08lX%s%s",
			info->start[i],
			erased ? " E" : "  ",
			info->protect[i] ? "RO " : "   ");
#else
		if ((i % 5) == 0)
			printf ("\n   ");
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     ");
#endif

	}
	printf ("\n");
	return;
}

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


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

/*
 * The following code cannot be run from FLASH!
 */
ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	short n;
	CFG_FLASH_WORD_SIZE value,value2,value3;
	ulong base = (ulong)addr;
	volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)addr;

	/* Write auto select command: read Manufacturer ID */
	addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
	addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
	addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00900090;

	value = addr2[CFG_FLASH_READ0];

	switch (value) {
	case (CFG_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	*/
	}

	addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
	addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
	addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00900090;

        value = addr2[CFG_FLASH_READ1];		/* device ID		*/
        value2 = addr2[CFG_FLASH_READ14];
        value3 = addr2[CFG_FLASH_READ15];

        switch (value2) {
	case (CFG_FLASH_WORD_SIZE)AMD_ID_LV320MTB_2:
		info->sector_count = 71;
		info->size = 0x00400000;	/* => 4 MB	*/
                if(value3==AMD_ID_LV320MT_3)
  		  info->flash_id += FLASH_AMLV320MT;
                else
  		  info->flash_id += FLASH_AMLV320MB;
                break;

	case (CFG_FLASH_WORD_SIZE)AMD_ID_LV640MTB_2:
		info->sector_count = 135;
		info->size = 0x00800000;	/* => 4 MB	*/
                if(value3==AMD_ID_LV320MT_3)
  		  info->flash_id += FLASH_AMLV640MT;
                else
  		  info->flash_id += FLASH_AMLV640MB;
                break;


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

	}

	/* set up sector start address table */
	if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV320MB) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV640MB)) {
		/* set sector offsets for bottom boot block type	*/
		for (i=0; i<8; ++i) {		/*  8 x 8k boot sectors	*/
			info->start[i] = base;
			base += 8 << 10;
		}
		while (i < info->sector_count) {	/* 64k regular sectors	*/
			info->start[i] = base;
			base += 64 << 10;
			++i;
		}
	} else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV320MT) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV640MT)) {
		/* set sector offsets for top boot block type		*/
		base += info->size;
		i = info->sector_count;
		for (n=0; n<8; ++n) {		/*  8 x 8k boot sectors	*/
			base -= 8 << 10;
			--i;
			info->start[i] = base;
		}
		while (i > 0) {			/* 64k regular sectors	*/
			base -= 64 << 10;
			--i;
			info->start[i] = base;
		}
	}

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
		/* Write auto select command: read protection status */
                addr2 = (CFG_FLASH_WORD_SIZE *)info->start[i];
                addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
		addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
		addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00900090;
		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
		/* D0 = 1 if protected */
		info->protect[i] = addr2[CFG_FLASH_READ2] & 1;
	}

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

	return (info->size);
}


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

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

	if ((s_first < 0) || (s_first > s_last)) {
		if (info->flash_id == FLASH_UNKNOWN) {
			printf ("- missing\n");
		} else {
			printf ("- no sectors to erase\n");
		}
		return 1;
	}

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

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
		    addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[sect]);
			if (sect == s_first) {
			    addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
			    addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
			    addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
			    addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
			    addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
			}
			addr2[0] = (CFG_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 = (CFG_FLASH_WORD_SIZE *)(info->start[l_sect]);
	while ((addr[0] & (CFG_FLASH_WORD_SIZE)0x00800080) != (CFG_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;
		}
	}

DONE:
	/* reset to read mode */
	addr = (CFG_FLASH_WORD_SIZE *)info->start[0];
	addr[0] = (CFG_FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */

	printf (" done\n");
	return 0;
}


/*-----------------------------------------------------------------------
 * Functions
 */

/*#define WRITE_BUFFER_PROG 1  */

int write_word (flash_info_t *info, ulong dest, ulong data);
#ifdef  WRITE_BUFFER_PROG
int write_buffer_program(flash_info_t *info, ulong dest, char *src);
#endif

/*-----------------------------------------------------------------------
 * 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) {
#ifdef  WRITE_BUFFER_PROG
	  if((cnt>=32)& !(wp & 0x1F)) {    /* if destination is aligned on 32 byte boundry use write burst */
		if ((rc = write_buffer_program(info,wp,src)) != 0) {
			return (rc);
		}
		wp  += 32;
		src += 32;
		cnt -= 32;
          } else
#endif
          {
		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
 */
int write_word (flash_info_t *info, ulong dest, ulong data)
{
	volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
	volatile CFG_FLASH_WORD_SIZE *dest2 = (CFG_FLASH_WORD_SIZE *)dest;
	volatile CFG_FLASH_WORD_SIZE *data2 = (CFG_FLASH_WORD_SIZE *)&data;
	ulong start;
	int flag;
	int i;

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

	for (i=0; i<4/sizeof(CFG_FLASH_WORD_SIZE); i++)
	  {
	    addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
	    addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
	    addr2[CFG_FLASH_ADDR0] = (CFG_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] & (CFG_FLASH_WORD_SIZE)0x00800080) !=
		   (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080)) {
	      if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
		return (1);
	      }
	    }
	  }

	return (0);
}

#ifdef  WRITE_BUFFER_PROG
/*-----------------------------------------------------------------------
 * Write a bunch of word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 3 - write buffer abort
 */
int write_buffer_program(flash_info_t *info, ulong dest, char *src)
{
	volatile CFG_FLASH_WORD_SIZE *target_sector;
	volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
	volatile CFG_FLASH_WORD_SIZE *dest2 = (CFG_FLASH_WORD_SIZE *)dest;
	volatile CFG_FLASH_WORD_SIZE *data2 = (CFG_FLASH_WORD_SIZE *)src;
CFG_FLASH_WORD_SIZE progstat;
        ulong start;
	int flag;
	int i,j;
	j=info->sector_count -1;
	/*find sector start address to program*/
	while(info->start[j] > dest) j--;

	target_sector = (CFG_FLASH_WORD_SIZE *)(info->start[j]);
	/* Check if Flash is (sufficiently) erased */
/*	if ((*dest2 & *data2) != *data2) {
		return (2);
	} */

        /* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();
	addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
	addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
	target_sector[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00250025; /* write to buffer command */
	/*write count of words to buffer minus 1 */
	target_sector[CFG_FLASH_ADDR0] = (32/sizeof(CFG_FLASH_WORD_SIZE)) - 1 ;
	/*write first word */
/*	dest2[0] = data2[0]; */
        /* write the rest */
        i=0;
	do
	  {
	    dest2[i] = data2[i];
            i++;
	  }while(i<(32/sizeof(CFG_FLASH_WORD_SIZE)));
	/*write buffer command */
	target_sector[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00290029;
	    /* re-enable interrupts if necessary */
            if (flag)
	      enable_interrupts();
	    /* data polling for D7 */
           i--;  /* decrement index to point to last word written */
	    start = get_timer (0);

	    while( ((progstat=dest2[i]) & (CFG_FLASH_WORD_SIZE)0x00800080) !=
		/*check for chip time out or abort*/
		   (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) ){
              if(progstat & (CFG_FLASH_WORD_SIZE)0x00220022) {
		if(progstat & (CFG_FLASH_WORD_SIZE)0x00200020){   /*check for chip time out*/
		/* return success if it really did work */
		    if( (dest2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) ==
			   (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) ) return 0;
                    data2[i] = (CFG_FLASH_WORD_SIZE)0x00F000F0;   /* reset flash chip */
printf("TimeOut\n"); /* for debugging only, remove */
                    return 1;
                   }
		/* return success if it really did work */
		if( (dest2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) ==
		   (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) ) return 0;
		/* if your here it is an abort condition */
		addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
		addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
		addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00F000F0;  /* Write buffer abort reset */
printf("abort\n");  /* for debugging only, remove */
		return 3;
                }
	      if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
		return (1);    /* U-Boot timer time out */
	      }
	    }
 return (0);

}

#endif /*  WRITE_BUFFER_PROG   */


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