flash.c

ATMEL公司的AT91RM9200芯片在嵌入式系统中应用非常多

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * 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 <mpc824x.h>
#include <asm/processor.h>
#include <asm/pci_io.h>

#define ROM_CS0_START	0xFF800000
#define ROM_CS1_START	0xFF000000

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

#if defined(CFG_ENV_IS_IN_FLASH)
# ifndef  CFG_ENV_ADDR
#  define CFG_ENV_ADDR  (CFG_FLASH_BASE + CFG_ENV_OFFSET)
# endif
# ifndef  CFG_ENV_SIZE
#  define CFG_ENV_SIZE  CFG_ENV_SECT_SIZE
# endif
# ifndef  CFG_ENV_SECT_SIZE
#  define CFG_ENV_SECT_SIZE  CFG_ENV_SIZE
# endif
#endif

/*-----------------------------------------------------------------------
 * Functions
 */
static int write_word (flash_info_t *info, ulong dest, ulong data);
#if 0
static void flash_get_offsets (ulong base, flash_info_t *info);
#endif /* 0 */

/*flash command address offsets*/

#if 0
#define ADDR0           (0x555)
#define ADDR1           (0x2AA)
#define ADDR3           (0x001)
#else
#define ADDR0		(0xAAA)
#define ADDR1		(0x555)
#define ADDR3		(0x001)
#endif

#define FLASH_WORD_SIZE unsigned char

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

#if 0
static int byte_parity_odd(unsigned char x) __attribute__ ((const));
#endif /* 0 */
static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));

typedef struct
{
  FLASH_WORD_SIZE extval;
  unsigned short intval;
} map_entry;

#if 0
static int
byte_parity_odd(unsigned char x)
{
  x ^= x >> 4;
  x ^= x >> 2;
  x ^= x >> 1;
  return (x & 0x1) != 0;
}
#endif /* 0 */



static unsigned long
flash_id(unsigned char mfct, unsigned char chip)
{
  static const map_entry mfct_map[] =
    {
      {(FLASH_WORD_SIZE) AMD_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
      {(FLASH_WORD_SIZE) FUJ_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
      {(FLASH_WORD_SIZE) STM_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
      {(FLASH_WORD_SIZE) MT_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
      {(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
      {(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
    };

  static const map_entry chip_map[] =
  {
    {AMD_ID_F040B,	FLASH_AM040},
    {(FLASH_WORD_SIZE) STM_ID_x800AB,	FLASH_STM800AB}
  };

  const map_entry *p;
  unsigned long result = FLASH_UNKNOWN;

  /* find chip id */
  for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
    if(p->extval == chip)
    {
      result = FLASH_VENDMASK | p->intval;
      break;
    }

  /* find vendor id */
  for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
    if(p->extval == mfct)
    {
      result &= ~FLASH_VENDMASK;
      result |= (unsigned long) p->intval << 16;
      break;
    }

  return result;
}



unsigned long
flash_init(void)
{
  unsigned long i;
  unsigned char j;
  static const ulong flash_banks[] = CFG_FLASH_BANKS;

  /* Init: no FLASHes known */
  for (i = 0; i < CFG_MAX_FLASH_BANKS; i++)
  {
    flash_info_t * const pflinfo = &flash_info[i];
    pflinfo->flash_id = FLASH_UNKNOWN;
    pflinfo->size = 0;
    pflinfo->sector_count = 0;
  }

  for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++)
  {
    flash_info_t * const pflinfo = &flash_info[i];
    const unsigned long base_address = flash_banks[i];
    volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;
#if 0
    volatile FLASH_WORD_SIZE * addr2;
#endif
#if 0
    /* write autoselect sequence */
    flash[0x5555] = 0xaa;
    flash[0x2aaa] = 0x55;
    flash[0x5555] = 0x90;
#else
    flash[0xAAA << (3 * i)] = 0xaa;
    flash[0x555 << (3 * i)] = 0x55;
    flash[0xAAA << (3 * i)] = 0x90;
#endif
    __asm__ __volatile__("sync");

#if 0
    pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);
#else
    pflinfo->flash_id = flash_id(flash[0x0], flash[0x2 + 14 * i]);
#endif

    switch(pflinfo->flash_id & FLASH_TYPEMASK)
    {
      case FLASH_AM040:
        pflinfo->size = 0x00080000;
	pflinfo->sector_count = 8;
        for(j = 0; j < 8; j++)
	{
	  pflinfo->start[j] = base_address + 0x00010000 * j;
	  pflinfo->protect[j] = flash[(j << 16) | 0x2];
	}
	break;
      case FLASH_STM800AB:
	pflinfo->size = 0x00100000;
	pflinfo->sector_count = 19;
	pflinfo->start[0] = base_address;
	pflinfo->start[1] = base_address + 0x4000;
	pflinfo->start[2] = base_address + 0x6000;
	pflinfo->start[3] = base_address + 0x8000;
	for(j = 1; j < 16; j++)
	{
	  pflinfo->start[j+3] = base_address + 0x00010000 * j;
	}
#if 0
        /* check for protected sectors */
        for (j = 0; j < pflinfo->sector_count; j++) {
          /* read sector protection at sector address, (A7 .. A0) = 0x02 */
          /* D0 = 1 if protected */
          addr2 = (volatile FLASH_WORD_SIZE *)(pflinfo->start[j]);
            if (pflinfo->flash_id & FLASH_MAN_SST)
              pflinfo->protect[j] = 0;
            else
              pflinfo->protect[j] = addr2[2] & 1;
        }
#endif
	break;
    }
    /* Protect monitor and environment sectors
     */
#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
    flash_protect(FLAG_PROTECT_SET,
		CFG_MONITOR_BASE,
		CFG_MONITOR_BASE + monitor_flash_len - 1,
		&flash_info[0]);
#endif

#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
    flash_protect(FLAG_PROTECT_SET,
		CFG_ENV_ADDR,
		CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
		&flash_info[0]);
#endif

    /* reset device to read mode */
    flash[0x0000] = 0xf0;
    __asm__ __volatile__("sync");
  }

    return flash_info[0].size + flash_info[1].size;
}

#if 0
static void
flash_get_offsets (ulong base, flash_info_t *info)
{
    int i;

    /* set up sector start address table */
        if (info->flash_id & FLASH_MAN_SST)
          {
            for (i = 0; i < info->sector_count; i++)
              info->start[i] = base + (i * 0x00010000);
          }
        else
    if (info->flash_id & FLASH_BTYPE) {
        /* set sector offsets for bottom boot block type    */
        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 {
        /* set sector offsets for top boot block type       */
        i = info->sector_count - 1;
        info->start[i--] = base + info->size - 0x00004000;
        info->start[i--] = base + info->size - 0x00006000;
        info->start[i--] = base + info->size - 0x00008000;
        for (; i >= 0; i--) {
            info->start[i] = base + i * 0x00010000;
        }
    }

}
#endif /* 0 */

/*-----------------------------------------------------------------------
 */
void
flash_print_info(flash_info_t *info)
{
  static const char unk[] = "Unknown";
  const char *mfct = unk, *type = unk;
  unsigned int i;

  if(info->flash_id != FLASH_UNKNOWN)
  {
    switch(info->flash_id & FLASH_VENDMASK)
    {
      case FLASH_MAN_AMD:	mfct = "AMD";				break;
      case FLASH_MAN_FUJ:	mfct = "FUJITSU";			break;
      case FLASH_MAN_STM:	mfct = "STM";				break;
      case FLASH_MAN_SST:	mfct = "SST";				break;
      case FLASH_MAN_BM:	mfct = "Bright Microelectonics";	break;
      case FLASH_MAN_INTEL:	mfct = "Intel";				break;
    }

    switch(info->flash_id & FLASH_TYPEMASK)
    {
      case FLASH_AM040:		type = "AM29F040B (512K * 8, uniform sector size)";	break;
      case FLASH_AM400B:	type = "AM29LV400B (4 Mbit, bottom boot sect)";		break;
      case FLASH_AM400T:	type = "AM29LV400T (4 Mbit, top boot sector)";		break;
      case FLASH_AM800B:	type = "AM29LV800B (8 Mbit, bottom boot sect)";		break;
      case FLASH_AM800T:	type = "AM29LV800T (8 Mbit, top boot sector)";		break;
      case FLASH_AM160T:	type = "AM29LV160T (16 Mbit, top boot sector)";		break;
      case FLASH_AM320B:	type = "AM29LV320B (32 Mbit, bottom boot sect)";	break;
      case FLASH_AM320T:	type = "AM29LV320T (32 Mbit, top boot sector)";		break;
      case FLASH_STM800AB:	type = "M29W800AB (8 Mbit, bottom boot sect)";		break;
      case FLASH_SST800A:	type = "SST39LF/VF800 (8 Mbit, uniform sector size)";	break;
      case FLASH_SST160A:	type = "SST39LF/VF160 (16 Mbit, uniform sector size)";	break;
    }
  }

  printf(
    "\n  Brand: %s Type: %s\n"
    "  Size: %lu KB in %d Sectors\n",
    mfct,
    type,
    info->size >> 10,
    info->sector_count
  );

  printf ("  Sector Start Addresses:");

  for (i = 0; i < info->sector_count; i++)
  {
    unsigned long size;
    unsigned int erased;
    unsigned long * flash = (unsigned long *) info->start[i];

    /*
     * Check if whole sector is erased
     */
    size =
      (i != (info->sector_count - 1)) ?
      (info->start[i + 1] - info->start[i]) >> 2 :
      (info->start[0] + info->size - info->start[i]) >> 2;

    for(
      flash = (unsigned long *) info->start[i], erased = 1;
      (flash != (unsigned long *) info->start[i] + size) && erased;
      flash++
    )
      erased = *flash == ~0x0UL;

    printf(
      "%s %08lX %s %s",
      (i % 5) ? "" : "\n   ",
      info->start[i],
      erased ? "E" : " ",
      info->protect[i] ? "RO" : "  "
    );
  }

  puts("\n");
  return;
}

#if 0

/*
 * The following code cannot be run from FLASH!
 */
ulong
flash_get_size (vu_long *addr, flash_info_t *info)
{
   short i;
    FLASH_WORD_SIZE value;
    ulong base = (ulong)addr;
        volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;

    printf("flash_get_size: \n");
    /* Write auto select command: read Manufacturer ID */
    eieio();
    addr2[ADDR0] = (FLASH_WORD_SIZE)0xAA;
    addr2[ADDR1] = (FLASH_WORD_SIZE)0x55;
    addr2[ADDR0] = (FLASH_WORD_SIZE)0x90;
    value = addr2[0];