flash.c

适合KS8695X

/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * (C) Copyright 2003
 * Reinhard Meyer, EMK Elektronik GmbH, [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>

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

#if defined (CONFIG_TOP860)
  typedef unsigned short FLASH_PORT_WIDTH;
  typedef volatile unsigned short FLASH_PORT_WIDTHV;
  #define	FLASH_ID_MASK	0xFF

  #define FPW	FLASH_PORT_WIDTH
  #define FPWV	FLASH_PORT_WIDTHV

  #define FLASH_CYCLE1	0x0555
  #define FLASH_CYCLE2	0x02aa
  #define FLASH_ID1		0
  #define FLASH_ID2		1
  #define FLASH_ID3		0x0e
  #define FLASH_ID4		0x0F
#endif

#if defined (CONFIG_TOP5200) && !defined (CONFIG_LITE5200)
  typedef unsigned char FLASH_PORT_WIDTH;
  typedef volatile unsigned char FLASH_PORT_WIDTHV;
  #define	FLASH_ID_MASK	0xFF

  #define FPW	FLASH_PORT_WIDTH
  #define FPWV	FLASH_PORT_WIDTHV

  #define FLASH_CYCLE1	0x0aaa
  #define FLASH_CYCLE2	0x0555
  #define FLASH_ID1		0
  #define FLASH_ID2		2
  #define FLASH_ID3		0x1c
  #define FLASH_ID4		0x1E
#endif

#if defined (CONFIG_TOP5200) && defined (CONFIG_LITE5200)
  typedef unsigned char FLASH_PORT_WIDTH;
  typedef volatile unsigned char FLASH_PORT_WIDTHV;
  #define	FLASH_ID_MASK	0xFF

  #define FPW	FLASH_PORT_WIDTH
  #define FPWV	FLASH_PORT_WIDTHV

  #define FLASH_CYCLE1	0x0555
  #define FLASH_CYCLE2	0x02aa
  #define FLASH_ID1		0
  #define FLASH_ID2		1
  #define FLASH_ID3		0x0E
  #define FLASH_ID4		0x0F
#endif

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size(FPWV *addr, flash_info_t *info);
static void flash_reset(flash_info_t *info);
static int write_word_amd(flash_info_t *info, FPWV *dest, FPW data);
static flash_info_t *flash_get_info(ulong base);

/*-----------------------------------------------------------------------
 * flash_init()
 *
 * sets up flash_info and returns size of FLASH (bytes)
 */
unsigned long flash_init (void)
{
	unsigned long size = 0;
	int i = 0;
	extern void flash_preinit(void);
	extern void flash_afterinit(uint, ulong, ulong);
	ulong flashbase = CFG_FLASH_BASE;

	flash_preinit();

	/* There is only ONE FLASH device */
	memset(&flash_info[i], 0, sizeof(flash_info_t));
	flash_info[i].size =
			flash_get_size((FPW *)flashbase, &flash_info[i]);
	size += flash_info[i].size;

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_BASE,
		      CFG_MONITOR_BASE+monitor_flash_len-1,
		      flash_get_info(CFG_MONITOR_BASE));
#endif

#ifdef	CFG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR,
		      CFG_ENV_ADDR+CFG_ENV_SIZE-1,
		      flash_get_info(CFG_ENV_ADDR));
#endif


	flash_afterinit(i, flash_info[i].start[0], flash_info[i].size);
	return size ? size : 1;
}

/*-----------------------------------------------------------------------
 */
static void flash_reset(flash_info_t *info)
{
	FPWV *base = (FPWV *)(info->start[0]);

	/* Put FLASH back in read mode */
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
		*base = (FPW)0x00FF00FF;	/* Intel Read Mode */
	else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
		*base = (FPW)0x00F000F0;	/* AMD Read Mode */
}

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

static flash_info_t *flash_get_info(ulong base)
{
	int i;
	flash_info_t * info;

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i ++) {
		info = & flash_info[i];
		if (info->size &&
			info->start[0] <= base && base <= info->start[0] + info->size - 1)
			break;
	}

	return i == CFG_MAX_FLASH_BANKS ? 0 : info;
}

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

void flash_print_info (flash_info_t *info)
{
	int i;
	uchar *boottype;
	uchar *bootletter;
	uchar *fmt;
	uchar botbootletter[] = "B";
	uchar topbootletter[] = "T";
	uchar botboottype[] = "bottom boot sector";
	uchar topboottype[] = "top boot sector";

	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;
#if 0
	case FLASH_MAN_BM:	printf ("BRIGHT MICRO ");	break;
	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
	case FLASH_MAN_SST:	printf ("SST ");		break;
	case FLASH_MAN_STM:	printf ("STM ");		break;
	case FLASH_MAN_INTEL:	printf ("INTEL ");		break;
#endif
	default:		printf ("Unknown Vendor ");	break;
	}

	/* check for top or bottom boot, if it applies */
	if (info->flash_id & FLASH_BTYPE) {
		boottype = botboottype;
		bootletter = botbootletter;
	}
	else {
		boottype = topboottype;
		bootletter = topbootletter;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM160T:
	case FLASH_AM160B:
		fmt = "29LV160%s (16 Mbit, %s)\n";
		break;
	case FLASH_AMLV640U:
		fmt = "29LV640M (64 Mbit)\n";
		break;
	case FLASH_AMDLV065D:
		fmt = "29LV065D (64 Mbit)\n";
		break;
	case FLASH_AMLV256U:
		fmt = "29LV256M (256 Mbit)\n";
		break;
	default:
		fmt = "Unknown Chip Type\n";
		break;
	}

	printf (fmt, bootletter, boottype);

	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) {
		ulong	size;
		int		erased;
		ulong	*flash = (unsigned long *) info->start[i];

		if ((i % 5) == 0) {
			printf ("\n   ");
		}

		/*
		 * 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 (" %08lX %s %s",
			info->start[i],
			erased ? "E": " ",
			info->protect[i] ? "(RO)" : "    ");
	}

	printf ("\n");
}

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

/*
 * The following code cannot be run from FLASH!
 */

ulong flash_get_size (FPWV *addr, flash_info_t *info)
{
	int		i;

	/* Write auto select command: read Manufacturer ID */
	/* Write auto select command sequence and test FLASH answer */
	addr[FLASH_CYCLE1] = (FPW)0x00AA00AA;	/* for AMD, Intel ignores this */
	addr[FLASH_CYCLE2] = (FPW)0x00550055;	/* for AMD, Intel ignores this */
	addr[FLASH_CYCLE1] = (FPW)0x00900090;	/* selects Intel or AMD */

	/* The manufacturer codes are only 1 byte, so just use 1 byte.
	 * This works for any bus width and any FLASH device width.
	 */
	udelay(100);
	switch (addr[FLASH_ID1] & 0xff) {

	case (uchar)AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;

#if 0
	case (uchar)INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;
#endif

	default:
		printf ("unknown vendor=%x ", addr[FLASH_ID1] & 0xff);
		info->flash_id = FLASH_UNKNOWN;