/*
 * (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 <mpc8xx.h>

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);

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

unsigned long flash_init (void)
{
	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long size_b0, size_b1;
	int i;

	/* 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);
	}

	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);

	if (size_b1 > size_b0) {
		printf ("## ERROR: "
			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
			size_b1, size_b1<<20,
			size_b0, size_b0<<20
		);
		flash_info[0].flash_id	= FLASH_UNKNOWN;
		flash_info[1].flash_id	= FLASH_UNKNOWN;
		flash_info[0].sector_count	= -1;
		flash_info[1].sector_count	= -1;
		flash_info[0].size		= 0;
		flash_info[1].size		= 0;
		return (0);
	}

	/* Remap FLASH according to real size */
	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000);
#ifdef CONFIG_FLASH_16BIT
	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V | BR_PS_16; /* 16 Bit data port */
#else
	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;
#endif

	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_BASE,
		      CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
		      &flash_info[0]);
#endif

	if (size_b1) {
		memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
#ifdef CONFIG_FLASH_16BIT
		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
				    BR_MS_GPCM | BR_V | BR_PS_16;
#else
		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
				    BR_MS_GPCM | BR_V;
#endif

		/* Re-do sizing to get full correct info */
		size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
					  &flash_info[1]);

		flash_get_offsets (CFG_FLASH_BASE + size_b0, &flash_info[1]);

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
		/* monitor protection ON by default */
		flash_protect(FLAG_PROTECT_SET,
			      CFG_MONITOR_BASE,
			      CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
			      &flash_info[1]);
#endif
	} else {
		memctl->memc_br1 = 0;		/* invalidate bank */

		flash_info[1].flash_id = FLASH_UNKNOWN;
		flash_info[1].sector_count = -1;
	}

	flash_info[0].size = size_b0;
	flash_info[1].size = size_b1;

	return (size_b0 + size_b1);
}

/*-----------------------------------------------------------------------
 */
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_SST) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00002000);
		}
		return;
	}

	/* set up sector start address table */
	if (info->flash_id & FLASH_BTYPE) {
		/* set sector offsets for bottom boot block type	*/
#ifdef CONFIG_FLASH_16BIT
		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
		info->start[0] = base + 0x00000000;
		info->start[1] = base + 0x00008000;
		info->start[2] = base + 0x0000C000;
		info->start[3] = base + 0x00010000;
		for (i = 4; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00020000) - 0x00060000;
#endif
		}
	} else {
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		info->start[i--] = base + info->size - 0x00008000;
		info->start[i--] = base + info->size - 0x0000C000;
		info->start[i--] = base + info->size - 0x00010000;
		for (; i >= 0; i--) {
			info->start[i] = base + i * 0x00020000;
		}
	}

}

/*-----------------------------------------------------------------------
 */
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_AMD:	printf ("AMD ");		break;
	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
	case FLASH_MAN_SST:	printf ("SST ");		break;
	case FLASH_MAN_STM:	printf ("STM ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
				break;
	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
				break;
	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
				break;
	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
				break;
	case FLASH_SST200A:	printf ("39xF200A (2M = 128K x 16)\n");
				break;
	case FLASH_SST400A:	printf ("39xF400A (4M = 256K x 16)\n");
				break;
	case FLASH_SST800A:	printf ("39xF800A (8M = 512K x 16)\n");
				break;
	case FLASH_STM800AB:	printf ("M29W800AB (8M = 512K x 16)\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 (vu_long *addr, flash_info_t *info)
{
	short i;
	ulong value;
	ulong base = (ulong)addr;

	/* Write auto select command: read Manufacturer ID */
#ifdef CONFIG_FLASH_16BIT
	vu_short *s_addr = (vu_short*)addr;
	s_addr[0x5555] = 0x00AA;
	s_addr[0x2AAA] = 0x0055;
	s_addr[0x5555] = 0x0090;
	value = s_addr[0];
	value = value|(value<<16);
#else
	addr[0x5555] = 0x00AA00AA;
	addr[0x2AAA] = 0x00550055;
	addr[0x5555] = 0x00900090;
	value = addr[0];
#endif

	switch (value) {
	case AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	case FUJ_MANUFACT:
		info->flash_id = FLASH_MAN_FUJ;
		break;
	case SST_MANUFACT:
		info->flash_id = FLASH_MAN_SST;
		break;
	case STM_MANUFACT:
		info->flash_id = FLASH_MAN_STM;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}
#ifdef CONFIG_FLASH_16BIT
	value = s_addr[1];
	value = value|(value<<16);
#else
	value = addr[1];			/* device ID		*/
#endif

	switch (value) {
	case AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

	case AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
#ifdef CONFIG_FLASH_16BIT
		info->sector_count = 19;
		info->size = 0x00100000;	/* => 1 MB */
#else
		info->sector_count = 19;
		info->size = 0x00200000;	/* => 2 MB	*/
#endif
		break;

	case AMD_ID_LV160T:
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/

	case AMD_ID_LV160B:
		info->flash_id += FLASH_AM160B;
#ifdef CONFIG_FLASH_16BIT
		info->sector_count = 35;
		info->size = 0x00200000;	/* => 2 MB	*/
#else
		info->sector_count = 35;
		info->size = 0x00400000;	/* => 4 MB	*/
#endif

		break;
#if 0	/* enable when device IDs are available */
	case AMD_ID_LV320T:
		info->flash_id += FLASH_AM320T;
		info->sector_count = 67;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/

	case AMD_ID_LV320B:
		info->flash_id += FLASH_AM320B;
		info->sector_count = 67;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/
#endif
	case SST_ID_xF200A:
		info->flash_id += FLASH_SST200A;
		info->sector_count = 64;	/* 39xF200A ID ( 2M = 128K x 16	) */
		info->size = 0x00080000;
		break;
	case SST_ID_xF400A:
		info->flash_id += FLASH_SST400A;
		info->sector_count = 128;	/* 39xF400A ID ( 4M = 256K x 16	) */
		info->size = 0x00100000;
		break;
	case SST_ID_xF800A:
		info->flash_id += FLASH_SST800A;
		info->sector_count = 256;	/* 39xF800A ID ( 8M = 512K x 16	) */
		info->size = 0x00200000;
		break;				/* => 2 MB		*/
	case STM_ID_x800AB:
		info->flash_id += FLASH_STM800AB;
		info->sector_count = 19;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/
	default:
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */

	}

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

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00002000);
		}
	} else {	/* AMD and Fujitsu types */
		/* set up sector start address table */
		if (info->flash_id & FLASH_BTYPE) {
			/* set sector offsets for bottom boot block type	*/
#ifdef CONFIG_FLASH_16BIT

			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
			info->start[0] = base + 0x00000000;
			info->start[1] = base + 0x00008000;
			info->start[2] = base + 0x0000C000;
			info->start[3] = base + 0x00010000;
			for (i = 4; i < info->sector_count; i++) {
				info->start[i] = base + (i * 0x00020000) - 0x00060000;
#endif
			}
		} else {
			/* set sector offsets for top boot block type		*/
			i = info->sector_count - 1;
			info->start[i--] = base + info->size - 0x00008000;
			info->start[i--] = base + info->size - 0x0000C000;
			info->start[i--] = base + info->size - 0x00010000;
			for (; i >= 0; i--) {
				info->start[i] = base + i * 0x00020000;
			}
		}

		/* 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
			 */
#ifdef CONFIG_FLASH_16BIT
			s_addr = (volatile unsigned short *)(info->start[i]);
			info->protect[i] = s_addr[2] & 1;
#else
			addr = (volatile unsigned long *)(info->start[i]);
			info->protect[i] = addr[2] & 1;
#endif
		}
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
#ifdef CONFIG_FLASH_16BIT
		s_addr = (volatile unsigned short *)(info->start[0]);
		*s_addr = 0x00F0;	/* reset bank */
#else
		addr = (volatile unsigned long *)info->start[0];
		*addr = 0x00F000F0;	/* reset bank */
#endif

	}
	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	vu_long *addr = (vu_long*)(info->start[0]);
	int flag, prot, sect;
	ulong start, now, last;
#ifdef CONFIG_FLASH_16BIT
	vu_short *s_addr = (vu_short*)addr;
#endif

	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;
	}
/*#ifndef CONFIG_FLASH_16BIT
	ulong type;
	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_SST) && (type != FLASH_MAN_STM)) {
		printf ("Can't erase unknown flash type %08lx - aborted\n",
			info->flash_id);
		return;
	}
#endif*/
	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");
	}

	start = get_timer (0);
	last  = start;
	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
#ifdef CONFIG_FLASH_16BIT
			vu_short *s_sect_addr = (vu_short*)(info->start[sect]);
#else
			vu_long	*sect_addr = (vu_long*)(info->start[sect]);
#endif
			/* Disable interrupts which might cause a timeout here */
			flag = disable_interrupts();

#ifdef CONFIG_FLASH_16BIT

			/*printf("\ns_sect_addr=%x",s_sect_addr);*/
			s_addr[0x5555] = 0x00AA;
			s_addr[0x2AAA] = 0x0055;
			s_addr[0x5555] = 0x0080;
			s_addr[0x5555] = 0x00AA;
			s_addr[0x2AAA] = 0x0055;
			s_sect_addr[0] = 0x0030;
#else
			addr[0x5555] = 0x00AA00AA;
			addr[0x2AAA] = 0x00550055;
			addr[0x5555] = 0x00800080;
			addr[0x5555] = 0x00AA00AA;
			addr[0x2AAA] = 0x00550055;
			sect_addr[0] = 0x00300030;
#endif
			/* re-enable interrupts if necessary */
			if (flag)
				enable_interrupts();

			/* wait at least 80us - let's wait 1 ms */
			udelay (1000);

#ifdef CONFIG_FLASH_16BIT
			while ((s_sect_addr[0] & 0x0080) != 0x0080) {
#else
			while ((sect_addr[0] & 0x00800080) != 0x00800080) {
#endif
				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;
				}
			}
		}
	}

	/* reset to read mode */
	addr = (volatile unsigned long *)info->start[0];
#ifdef CONFIG_FLASH_16BIT
	s_addr[0] = 0x00F0;	/* reset bank */
#else
	addr[0] = 0x00F000F0;	/* reset bank */
#endif

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

/*-----------------------------------------------------------------------
 * 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, data;
	int i, l, rc;

	if (info->flash_id == FLASH_UNKNOWN) {
		return 4;
	}

	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)
{
	vu_long *addr = (vu_long*)(info->start[0]);

#ifdef CONFIG_FLASH_16BIT
	vu_short high_data;
	vu_short low_data;
	vu_short *s_addr = (vu_short*)addr;
#endif
	ulong start;
	int flag;

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

#ifdef CONFIG_FLASH_16BIT
	/* Write the 16 higher-bits */
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	high_data = ((data>>16) & 0x0000ffff);

	s_addr[0x5555] = 0x00AA;
	s_addr[0x2AAA] = 0x0055;
	s_addr[0x5555] = 0x00A0;

	*((vu_short *)dest) = high_data;


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

	/* data polling for D7 */
	start = get_timer (0);
	while ((*((vu_short *)dest) & 0x0080) != (high_data & 0x0080)) {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			return (1);
		}
	}


	/* Write the 16 lower-bits */
#endif

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();
#ifdef CONFIG_FLASH_16BIT
	dest += 0x2;
	low_data = (data & 0x0000ffff);

	s_addr[0x5555] = 0x00AA;
	s_addr[0x2AAA] = 0x0055;
	s_addr[0x5555] = 0x00A0;
	*((vu_short *)dest) = low_data;

#else
	addr[0x5555] = 0x00AA00AA;
	addr[0x2AAA] = 0x00550055;
	addr[0x5555] = 0x00A000A0;
	*((vu_long *)dest) = data;
#endif

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

	/* data polling for D7 */
	start = get_timer (0);

#ifdef CONFIG_FLASH_16BIT
	while ((*((vu_short *)dest) & 0x0080) != (low_data & 0x0080)) {
#else
	while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
#endif

		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			return (1);
		}
	}
	return (0);
}

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