/*
 * (C) Copyright 2001
 * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
 *
 * (C) Copyright 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <linux/byteorder/swab.h>


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

/* Board support for 1 or 2 flash devices */
#undef FLASH_PORT_WIDTH32
#define FLASH_PORT_WIDTH16

#ifdef FLASH_PORT_WIDTH16
#define FLASH_PORT_WIDTH		ushort
#define FLASH_PORT_WIDTHV		vu_short
#define SWAP(x)               __swab16(x)
#else
#define FLASH_PORT_WIDTH		ulong
#define FLASH_PORT_WIDTHV		vu_long
#define SWAP(x)               __swab32(x)
#endif

#define FPW	   FLASH_PORT_WIDTH
#define FPWV   FLASH_PORT_WIDTHV

#define mb() __asm__ __volatile__ ("" : : : "memory")

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (FPW *addr, flash_info_t *info);
static int   write_data (flash_info_t *info, ulong dest, FPW data);
static void  flash_get_offsets (ulong base, flash_info_t *info);
void inline  spin_wheel(void);

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

unsigned long flash_init (void)
{
   int i;
    ulong size = 0;

    for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++)
    {
	switch (i)
	{
	   case 0:
	    flash_get_size((FPW *)PHYS_FLASH_1, &flash_info[i]);
		 flash_get_offsets(PHYS_FLASH_1, &flash_info[i]);
		break;
	   default:
		panic("configured too many flash banks!\n");
		break;
	}
	size += flash_info[i].size;
    }

    /* Protect monitor and environment sectors
     */
    flash_protect(FLAG_PROTECT_SET,
		  CONFIG_SYS_FLASH_BASE,
		  CONFIG_SYS_FLASH_BASE + monitor_flash_len  - 1,
		  &flash_info[0]);

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

    return size;
}

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

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

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
			info->protect[i] = 0;
		}
	}
}

/*-----------------------------------------------------------------------
 */
void flash_print_info  (flash_info_t *info)
{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
		printf ("missing or unknown FLASH type\n");
		return;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
		case FLASH_MAN_INTEL:	printf ("INTEL ");		break;
		default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
   case FLASH_28F128J3A:
				printf ("28F128J3A\n"); break;
	default:		printf ("Unknown Chip Type\n"); break;
	}

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

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
		if ((i % 5) == 0)
		printf ("\n   ");
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     "
		);
	}
	printf ("\n");
	return;
}

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (FPW *addr, flash_info_t *info)
{
	volatile FPW value;
	/* Write auto select command: read Manufacturer ID */
	addr[0x5555] = (FPW)0x00AA00AA;
	addr[0x2AAA] = (FPW)0x00550055;
	addr[0x5555] = (FPW)0x00900090;

   mb();
	value = addr[0];

   switch (value) {

   case (FPW)INTEL_MANUFACT:
      info->flash_id = FLASH_MAN_INTEL;
      break;

	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		addr[0] = (FPW)0x00FF00FF;      /* restore read mode */
		return (0);			/* no or unknown flash	*/
	}

   mb();
	value = addr[1];			/* device ID		*/
   switch (value) {

   case (FPW)INTEL_ID_28F128J3A:
      info->flash_id += FLASH_28F128J3A;
      info->sector_count = 128;
      info->size = 0x02000000;
      break;            /* => 16 MB     */

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

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

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

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
    int flag, prot, sect;
	ulong type, start;
	int rcode = 0;

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

	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_INTEL)) {
		printf ("Can't erase unknown flash type %08lx - aborted\n",
			info->flash_id);
		return 1;
    }

    prot = 0;
    for (sect=s_first; sect<=s_last; ++sect) {
	if (info->protect[sect]) {
	    prot++;
	}
    }

	if (prot) {
		printf ("- Warning: %d protected sectors will not be erased!\n",
			prot);
	} else {
		printf ("\n");
	}

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

    /* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			FPWV *addr = (FPWV *)(info->start[sect]);
			FPW status;

	printf("Erasing sector %2d ... ", sect);

	/* arm simple, non interrupt dependent timer */
	start = get_timer(0);

			*addr = (FPW)0x00500050;	/* clear status register */
			*addr = (FPW)0x00200020;	/* erase setup */
			*addr = (FPW)0x00D000D0;	/* erase confirm */

			while (((status = *addr) & (FPW)0x00800080) != (FPW)0x00800080) {
		if (get_timer(start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
					printf ("Timeout\n");
					*addr = (FPW)0x00B000B0; /* suspend erase	  */
					*addr = (FPW)0x00FF00FF; /* reset to read mode */
					rcode = 1;
					break;
	}
    }

			*addr = (FPW)0x00500050; /* clear status register cmd.   */
			*addr = (FPW)0x00FF00FF; /* resest to read mode          */

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

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - Flash not identified
 */

int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
    ulong cp, wp;
	FPW data;
	int count, i, l, rc, port_width;

	if (info->flash_id == FLASH_UNKNOWN) {
		return 4;
	}
/* get lower word aligned address */
#ifdef FLASH_PORT_WIDTH16
	wp = (addr & ~1);
	port_width = 2;
#else
	wp = (addr & ~3);
	port_width = 4;
#endif

    /*
     * handle unaligned start bytes
     */
    if ((l = addr - wp) != 0) {
	data = 0;
	for (i=0, cp=wp; i<l; ++i, ++cp) {
			data = (data << 8) | (*(uchar *)cp);
	}
		for (; i<port_width && cnt>0; ++i) {
			data = (data << 8) | *src++;
	    --cnt;
	    ++cp;
	}
		for (; cnt==0 && i<port_width; ++i, ++cp) {
			data = (data << 8) | (*(uchar *)cp);
	}

		if ((rc = write_data(info, wp, SWAP(data))) != 0) {
	    return (rc);
	}
		wp += port_width;
    }

    /*
     * handle word aligned part
     */
	count = 0;
	while (cnt >= port_width) {
		data = 0;
		for (i=0; i<port_width; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_data(info, wp, SWAP(data))) != 0) {
	    return (rc);
	}
		wp  += port_width;
		cnt -= port_width;
		if (count++ > 0x800)
		{
	 spin_wheel();
			count = 0;
		}
    }

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

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

	return (write_data(info, wp, SWAP(data)));
}

/*-----------------------------------------------------------------------
 * Write a word or halfword to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_data (flash_info_t *info, ulong dest, FPW data)
{
	FPWV *addr = (FPWV *)dest;
	ulong status;
	int flag;
	ulong start;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
		printf("not erased at %08lx (%x)\n",(ulong)addr,*addr);
		return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	*addr = (FPW)0x00400040;		/* write setup */
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	start = get_timer(0);

	/* wait while polling the status register */
	while (((status = *addr) & (FPW)0x00800080) != (FPW)0x00800080) {
		if (start = get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
			*addr = (FPW)0x00FF00FF;	/* restore read mode */
			return (1);
		}
    }

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

	return (0);
}

void inline
spin_wheel(void)
{
   static int p=0;
   static char w[] = "\\/-";

   printf("\010%c", w[p]);
   (++p == 3) ? (p = 0) : 0;
}