/*
 * (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>
 *
 * 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>

#define FLASH_BANK_SIZE 0x400000
#define MAIN_SECT_SIZE  0x20000

flash_info_t    flash_info[CFG_MAX_FLASH_BANKS];


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

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;
	 case 1:
		flashbase = PHYS_FLASH_2;
		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;
}

/*-----------------------------------------------------------------------
 */
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_28F320J3A & FLASH_TYPEMASK):
		printf("28F320J3A (32Mbit)\n");
		break;
	 case (INTEL_ID_28F128J3 & FLASH_TYPEMASK):
		printf("28F128J3 (128Mbit)\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");
      info++;
   }

Done:
}

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

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 */
	  vu_short *addr = (vu_short *)(info->start[sect]);

	  *addr = 0x20;        /* erase setup */
	  *addr = 0xD0;        /* erase confirm */

	  while ((*addr & 0x80) != 0x80) {
	     if (get_timer_masked() > CFG_FLASH_ERASE_TOUT) {
		*addr = 0xB0; /* suspend erase */
		*addr = 0xFF;        /* reset to read mode */
		rc = ERR_TIMOUT;
		goto outahere;
	     }
	  }

	  /* clear status register command */
	  *addr = 0x50;
	  /* reset to read mode */
	  *addr = 0xFF;
      }
      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;
}

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

static int write_word (flash_info_t *info, ulong dest, ushort data)
{
   vu_short *addr = (vu_short *)dest, val;
   int rc = ERR_OK;
   int flag;

   /* 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 = 0x50;

   /* program set-up command */
   *addr = 0x40;

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

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

   /* wait while polling the status register */
   while(((val = *addr) & 0x80) != 0x80)
   {
      if (get_timer_masked() > CFG_FLASH_WRITE_TOUT) {
	  rc = ERR_TIMOUT;
	  /* suspend program command */
	  *addr = 0xB0;
	  goto outahere;
      }
   }

   if(val & 0x1A) {        /* check for error */
      printf("\nFlash write error %02x at address %08lx\n",
	       (int)val, (unsigned long)dest);
      if(val & (1<<3)) {
	 printf("Voltage range error.\n");
	 rc = ERR_PROG_ERROR;
	 goto outahere;
      }
      if(val & (1<<1)) {
	 printf("Device protect error.\n");
	 rc = ERR_PROTECTED;
	 goto outahere;
      }
      if(val & (1<<4)) {
	 printf("Programming error.\n");
	 rc = ERR_PROG_ERROR;
	 goto outahere;
      }
      rc = ERR_PROG_ERROR;
      goto outahere;
   }

outahere:
   /* read array command */
   *addr = 0xFF;

   if (flag)
      enable_interrupts();

   return rc;
}

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

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

   wp = (addr & ~1);        /* 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 << 8);
      }
      for (; i<2 && cnt>0; ++i) {
	 data = (data >> 8) | (*src++ << 8);
	 --cnt;
	 ++cp;
      }
      for (; cnt==0 && i<2; ++i, ++cp) {
	 data = (data >> 8) | (*(uchar *)cp << 8);
      }

      if ((rc = write_word(info, wp, data)) != 0) {
	 return (rc);
      }
      wp += 2;
   }

   /*
    * handle word aligned part
    */
   while (cnt >= 2) {
      data = *((vu_short*)src);
      if ((rc = write_word(info, wp, data)) != 0) {
	  return (rc);
      }
      src += 2;
      wp  += 2;
      cnt -= 2;
   }

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

   /*
    * handle unaligned tail bytes
    */
   data = 0;
   for (i=0, cp=wp; i<2 && cnt>0; ++i, ++cp) {
      data = (data >> 8) | (*src++ << 8);
      --cnt;
   }
   for (; i<2; ++i, ++cp) {
      data = (data >> 8) | (*(uchar *)cp << 8);
   }

   return write_word(info, wp, data);
}