/*
 * (C) Copyright 2002
 * Lineo, Inc. <www.lineo.com>
 * Bernhard Kuhn <bkuhn@lineo.com>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <azu@sysgo.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>

ulong myflush(void);


#define FLASH_BANK_SIZE 0x200000	/* 2 MB */
#define MAIN_SECT_SIZE  0x10000		/* 64 KB */

flash_info_t    flash_info[CFG_MAX_FLASH_BANKS];


#define CMD_READ_ARRAY		0x00F0
#define CMD_UNLOCK1		0x00AA
#define CMD_UNLOCK2		0x0055
#define CMD_ERASE_SETUP		0x0080
#define CMD_ERASE_CONFIRM	0x0030
#define CMD_PROGRAM		0x00A0
#define CMD_UNLOCK_BYPASS	0x0020

#define MEM_FLASH_ADDR1		(*(volatile u16 *)(CFG_FLASH_BASE + (0x00005555<<1)))
#define MEM_FLASH_ADDR2		(*(volatile u16 *)(CFG_FLASH_BASE + (0x00002AAA<<1)))

#define BIT_ERASE_DONE		0x0080
#define BIT_RDY_MASK		0x0080
#define BIT_PROGRAM_ERROR	0x0020
#define BIT_TIMEOUT		0x80000000 /* our flag */

#define READY 1
#define ERR   2
#define TMO   4

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

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 =
	  (ATM_MANUFACT & FLASH_VENDMASK) |
	  (ATM_ID_BV1614 & 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);
	if (i == 0)
	  flashbase = PHYS_FLASH_1;
	else
	  panic("configured to many flash banks!\n");
	for (j = 0; j < flash_info[i].sector_count; j++)
	{

	    if (j <= 9)
	    {
		/* 1st to 8th are 8 KB */
		if (j <= 7)
		{
		    flash_info[i].start[j] = flashbase + j*0x2000;
		}

		/* 9th and 10th are both 32 KB */
		if ((j == 8) || (j == 9))
		{
			flash_info[i].start[j] = flashbase + 0x10000 + (j-8)*0x8000;
		}
	    }
	    else
	    {
		flash_info[i].start[j] = flashbase + (j-8)*MAIN_SECT_SIZE;
	    }
	}
	size += flash_info[i].size;
    }

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

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

    return size;
}

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

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

    switch (info->flash_id & FLASH_TYPEMASK)
    {
    case (ATM_ID_BV1614 & FLASH_TYPEMASK):
	printf("AT49BV1614 (16Mbit)\n");
	break;
    default:
	printf("Unknown Chip Type\n");
	goto Done;
	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");

Done:
}

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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
    ulong result;
    int iflag, cflag, prot, sect;
    int rc = ERR_OK;
    int chip1;

    /* first look for protection bits */

    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) !=
	(ATM_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.
     */
    cflag = icache_status();
    icache_disable();
    iflag = 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 */
	    volatile u16 *addr = (volatile u16 *)(info->start[sect]);

	    MEM_FLASH_ADDR1 = CMD_UNLOCK1;
	    MEM_FLASH_ADDR2 = CMD_UNLOCK2;
	    MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;

	    MEM_FLASH_ADDR1 = CMD_UNLOCK1;
	    MEM_FLASH_ADDR2 = CMD_UNLOCK2;
	    *addr = CMD_ERASE_CONFIRM;

	    /* wait until flash is ready */
	    chip1 = 0;

	    do
	    {
		result = *addr;

		/* check timeout */
		if (get_timer_masked() > CFG_FLASH_ERASE_TOUT)
		{
		    MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
		    chip1 = TMO;
		    break;
		}

		if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE)
			chip1 = READY;

	    }  while (!chip1);

	    MEM_FLASH_ADDR1 = CMD_READ_ARRAY;

	    if (chip1 == ERR)
	    {
		rc = ERR_PROG_ERROR;
		goto outahere;
	    }
	    if (chip1 == TMO)
	    {
		rc = ERR_TIMOUT;
		goto outahere;
	    }

	    printf("ok.\n");
	}
	else /* it was protected */
	{
	    printf("protected!\n");
	}
    }

    if (ctrlc())
      printf("User Interrupt!\n");

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

    if (iflag)
      enable_interrupts();

    if (cflag)
      icache_enable();

    return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash
 */

volatile static int write_word (flash_info_t *info, ulong dest, ulong data)
{
    volatile u16 *addr = (volatile u16 *)dest;
    ulong result;
    int rc = ERR_OK;
    int cflag, iflag;
    int chip1;

    /*
     * Check if Flash is (sufficiently) erased
     */
    result = *addr;
    if ((result & 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.
     */
    cflag = icache_status();
    icache_disable();
    iflag = disable_interrupts();

    MEM_FLASH_ADDR1 = CMD_UNLOCK1;
    MEM_FLASH_ADDR2 = CMD_UNLOCK2;
    MEM_FLASH_ADDR1 = CMD_PROGRAM;
    *addr = data;

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

    /* wait until flash is ready */
    chip1 = 0;
    do
    {
	result = *addr;

	/* check timeout */
	if (get_timer_masked() > CFG_FLASH_ERASE_TOUT)
	{
	    chip1 = ERR | TMO;
	    break;
	}
	if (!chip1 && ((result & 0x80) == (data & 0x80)))
		chip1 = READY;

    }  while (!chip1);

    *addr = CMD_READ_ARRAY;

    if (chip1 == ERR || *addr != data)
        rc = ERR_PROG_ERROR;

    if (iflag)
      enable_interrupts();

    if (cflag)
      icache_enable();

    return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash.
 */

int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
    ulong wp, data;
    int rc;

    if(addr & 1) {
      printf("unaligned destination not supported\n");
      return ERR_ALIGN;
    };

    if((int)src & 1) {
      printf("unaligned source not supported\n");
      return ERR_ALIGN;
    };

    wp = addr;

    while (cnt >= 2) {
	data = *((volatile u16*)src);
	if ((rc = write_word(info, wp, data)) != 0) {
	    return (rc);
	}
	src += 2;
	wp  += 2;
	cnt -= 2;
    }

    if(cnt == 1) {
      data =  (*((volatile u8*)src)) | (*((volatile u8*)(wp+1)) << 8);
	if ((rc = write_word(info, wp, data)) != 0) {
	    return (rc);
	}
	src += 1;
	wp  += 1;
	cnt -= 1;
    };

    return ERR_OK;
}