/*
 * (C) Copyright 2002
 * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Robert Schwebel, Pengutronix, <r.schwebel@pengutronix.de>
 *
 * (C) Copyright 2003 (2 x 16 bit Flash bank patches)
 * Rolf Peukert, IMMS gGmbH, <rolf.peukert@imms.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 <asm/arch/pxa-regs.h>

#define FLASH_BANK_SIZE 0x02000000
#define MAIN_SECT_SIZE	0x40000		/* 2x16 = 256k per sector */

flash_info_t	flash_info[CFG_MAX_FLASH_BANKS];


/**
 * flash_init: - initialize data structures for flash chips
 *
 * @return: size of the flash
 */

ulong flash_init(void)
{
	int i, j;
	ulong size = 0;

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
		ulong flashbase = 0;
		flash_info[i].flash_id =
			(INTEL_MANUFACT & FLASH_VENDMASK) |
			(INTEL_ID_28F128J3 & FLASH_TYPEMASK);
		flash_info[i].size = FLASH_BANK_SIZE;
		flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
		memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);

		switch (i) {
		case 0:
			flashbase = PHYS_FLASH_1;
			break;
		default:
			panic("configured too many flash banks!\n");
			break;
		}
		for (j = 0; j < flash_info[i].sector_count; j++) {
			flash_info[i].start[j] = flashbase + j*MAIN_SECT_SIZE;
		}
		size += flash_info[i].size;
	}

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

	flash_protect(FLAG_PROTECT_SET,
			CFG_ENV_ADDR,
			CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
			&flash_info[0]);

	return size;
}


/**
 * flash_print_info: - print information about the flash situation
 */

void flash_print_info  (flash_info_t *info)
{
	int i, j;

	for (j=0; j<CFG_MAX_FLASH_BANKS; j++) {

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

		switch (info->flash_id & FLASH_TYPEMASK) {
		case (INTEL_ID_28F128J3 & FLASH_TYPEMASK):
			printf("28F128J3 (128Mbit)\n");
			break;
		default:
			printf("Unknown Chip Type\n");
			return;
		}

		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");
		info++;
	}
}


/**
 * flash_erase: - erase flash sectors
 */

int flash_erase(flash_info_t *info, int s_first, int s_last)
{
	int flag, prot, sect;
	int rc = ERR_OK;

	if (info->flash_id == FLASH_UNKNOWN)
		return ERR_UNKNOWN_FLASH_TYPE;

	if ((s_first < 0) || (s_first > s_last)) {
		return ERR_INVAL;
	}

	if ((info->flash_id & FLASH_VENDMASK) != (INTEL_MANUFACT & FLASH_VENDMASK))
		return ERR_UNKNOWN_FLASH_VENDOR;

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

	if (prot) return ERR_PROTECTED;

	/*
	 * Disable interrupts which might cause a timeout
	 * here. Remember that our exception vectors are
	 * at address 0 in the flash, and we don't want a
	 * (ticker) exception to happen while the flash
	 * chip is in programming mode.
	 */

	flag = disable_interrupts();

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last && !ctrlc(); sect++) {

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

		/* arm simple, non interrupt dependent timer */
		reset_timer_masked();

		if (info->protect[sect] == 0) { /* not protected */
			u32 * volatile addr = (u32 * volatile)(info->start[sect]);

			/* erase sector:				    */
			/* The strata flashs are aligned side by side on    */
			/* the data bus, so we have to write the commands   */
			/* to both chips here:				    */

			*addr = 0x00200020;	/* erase setup */
			*addr = 0x00D000D0;	/* erase confirm */

			while ((*addr & 0x00800080) != 0x00800080) {
				if (get_timer_masked() > CFG_FLASH_ERASE_TOUT) {
					*addr = 0x00B000B0; /* suspend erase*/
					*addr = 0x00FF00FF; /* read mode    */
					rc = ERR_TIMOUT;
					goto outahere;
				}
			}
			*addr = 0x00500050; /* clear status register cmd.   */
			*addr = 0x00FF00FF; /* reset to read mode	    */
		}
		printf("ok.\n");
	}
	if (ctrlc()) printf("User Interrupt!\n");

outahere:
	/* allow flash to settle - wait 10 ms */
	udelay_masked(10000);

	if (flag) enable_interrupts();

	return rc;
}

/**
 * write_long: - copy memory to flash, assume a bank of 2 devices with 16bit each
 */

static int write_long (flash_info_t *info, ulong dest, ulong data)
{
	u32 * volatile addr = (u32 * volatile)dest, val;
	int rc = ERR_OK;
	int flag;

	/* read array command - just for the case... */
	*addr = 0x00FF00FF;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) return ERR_NOT_ERASED;

	/*
	 * Disable interrupts which might cause a timeout
	 * here. Remember that our exception vectors are
	 * at address 0 in the flash, and we don't want a
	 * (ticker) exception to happen while the flash
	 * chip is in programming mode.
	 */
	flag = disable_interrupts();

	/* clear status register command */
	*addr = 0x00500050;

	/* program set-up command */
	*addr = 0x00400040;

	/* latch address/data */
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked();

	/* wait while polling the status register */
	while(((val = *addr) & 0x00800080) != 0x00800080) {
		if (get_timer_masked() > CFG_FLASH_WRITE_TOUT) {
			rc = ERR_TIMOUT;
			/* suspend program command */
			*addr = 0x00B000B0;
			goto outahere;
		}
	}

	/* check for errors */
	if(val & 0x001A001A) {
		printf("\nFlash write error %02x at address %08lx\n",
			(int)val, (unsigned long)dest);
		if(val & 0x00080008) {
			printf("Voltage range error.\n");
			rc = ERR_PROG_ERROR;
			goto outahere;
		}
		if(val & 0x00020002) {
			printf("Device protect error.\n");
			rc = ERR_PROTECTED;
			goto outahere;
		}
		if(val & 0x00100010) {
			printf("Programming error.\n");
			rc = ERR_PROG_ERROR;
			goto outahere;
		}
		rc = ERR_PROG_ERROR;
		goto outahere;
	}

outahere:
	/* read array command */
	*addr = 0x00FF00FF;
	if (flag) enable_interrupts();

	return rc;
}


/**
 * write_buf: - Copy memory to flash.
 *
 * @param info:
 * @param src:	source of copy transaction
 * @param addr: where to copy to
 * @param cnt:	number of bytes to copy
 *
 * @return	error code
 */

/* "long" version, uses 32bit words */
int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
	ulong cp, wp;
	ulong data;
	int l;
	int i, 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 << 24);
		}
		for (; i<4 && cnt>0; ++i) {
			data = (data >> 8) | (*src++ << 24);
			--cnt;
			++cp;
		}
		for (; cnt==0 && i<4; ++i, ++cp) {
			data = (data >> 8) | (*(uchar *)cp << 24);
		}

		if ((rc = write_long(info, wp, data)) != 0) {
			return (rc);
		}
		wp += 4;
	}

	/*
	 * handle word aligned part
	 */
	while (cnt >= 4) {
		data = *((ulong*)src);
		if ((rc = write_long(info, wp, data)) != 0) {
			return (rc);
		}
		src += 4;
		wp  += 4;
		cnt -= 4;
	}

	if (cnt == 0) return ERR_OK;

	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
		data = (data >> 8) | (*src++ << 24);
		--cnt;
	}
	for (; i<4; ++i, ++cp) {
		data = (data >> 8) | (*(uchar *)cp << 24);
	}

	return write_long(info, wp, data);
}