flash.c

UBOOT 源码

/*
 * (C) Copyright 2003 Motorola Inc.
 *  Xianghua Xiao,([e-mail])
 *
 * (C) Copyright 2000, 2001
 *  Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * (C) Copyright 2001, Stuart Hughes, Lineo Inc, [e-mail]
 * Add support the Sharp chips on the mpc8260ads.
 * I started with board/ip860/flash.c and made changes I found in
 * the MTD project by David Schleef.
 *
 * 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>

#if !defined(CFG_NO_FLASH)

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

/*
 * The variable should be in the flash info structure. Since it
 * is only used in this board specific file it is declared here.
 * In the future I think an endian flag should be part of the
 * flash_info_t structure. (Ron Alder)
 */
static ulong big_endian = 0;

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_block (flash_info_t *info, uchar * src, ulong dest, ulong cnt);
static int write_short (flash_info_t *info, ulong dest, ushort data);
static int write_word (flash_info_t *info, ulong dest, ulong data);
static int clear_block_lock_bit(flash_info_t *info, vu_long * addr);
/*-----------------------------------------------------------------------
 */

unsigned long flash_init (void)
{
	unsigned long size;
	int i;

	/* Init: enable write,
	 * or we cannot even write flash commands
	 */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;

		/* set the default sector offset */
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
			size, size<<20);
	}

	/* Re-do sizing to get full correct info */
	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	flash_info[0].size = size;

#if !defined(CONFIG_RAM_AS_FLASH)
#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_info[0]);
#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_SECT_SIZE-1,
		      &flash_info[0]);
#endif
#endif
	return (size);
}

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

	if (info->flash_id == FLASH_UNKNOWN) {
		printf ("missing or unknown FLASH type\n");
		return;
	}

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

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F016SV:	printf ("28F016SV (16 Mbit, 32 x 64k)\n");
				break;
	case FLASH_28F160S3:	printf ("28F160S3 (16 Mbit, 32 x 512K)\n");
				break;
	case FLASH_28F320S3:	printf ("28F320S3 (32 Mbit, 64 x 512K)\n");
				break;
	case FLASH_LH28F016SCT: printf ("28F016SC (16 Mbit, 32 x 64K)\n");
				break;
	case FLASH_28F640J3A:   printf ("28F640J3A (64 Mbit, 64 x 128K)\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				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");
}

 /* only deal with 16 bit and 32 bit port width, 16bit chip */
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	ulong value,va,vb,vc,vd;
	ulong base = (ulong)addr;
	ulong sector_offset;

#ifdef DEBUG
	printf("Check flash at 0x%08x\n",(uint)addr);
#endif
	/* Write "Intelligent Identifier" command: read Manufacturer ID */
	*addr = 0x90909090;
	udelay(20);
	asm("sync");

#ifndef CFG_FLASH_CFI
	printf("Not define CFG_FLASH_CFI\n");
	return (0);
#else
	value = addr[0];
	va=(value & 0xFF000000)>>24;
	vb=(value & 0x00FF0000)>>16;
	vc=(value & 0x0000FF00)>>8;
	vd=(value & 0x000000FF);
	if ((va==0) && (vb==0)) {
		printf("cannot identify Flash\n");
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}
	else if ((va==0) && (vb!=0)) {
		big_endian = 1;
		info->chipwidth = FLASH_CFI_BY16;
		if(vb == vd) info->portwidth = FLASH_CFI_32BIT;
		else info->portwidth = FLASH_CFI_16BIT;
	}
	else if ((va!=0) && (vb==0)) {
		big_endian = 0;
		info->chipwidth = FLASH_CFI_BY16;
		if(va == vc) info->portwidth = FLASH_CFI_32BIT;
		else info->portwidth = FLASH_CFI_16BIT;
	}
	else if ((va!=0) && (vb!=0)) {
		big_endian = 1;		/* no meaning for 8bit chip */
		info->chipwidth = FLASH_CFI_BY8;
		if(va == vb) info->portwidth = FLASH_CFI_16BIT;
		else info->portwidth = FLASH_CFI_8BIT;
	}
#ifdef DEBUG
	switch (info->portwidth) {
		case FLASH_CFI_8BIT:
			printf("port width is 8 bit.\n");
			break;
		case FLASH_CFI_16BIT:
			printf("port width is 16 bit, ");
			break;
		case FLASH_CFI_32BIT:
			printf("port width is 32 bit, ");
			break;
	}
	switch (info->chipwidth) {
		case FLASH_CFI_BY16:
			printf("chip width is 16 bit, ");
			switch (big_endian) {
				case 0:
					printf("Little Endian.\n");
					break;
				case 1:
					printf("Big Endian.\n");
					break;
			}
			break;
	}
#endif
#endif		/*#ifdef CFG_FLASH_CFI*/

	if (big_endian==0) value = (addr[0] & 0xFF000000) >>8;
	else value = (addr[0] & 0x00FF0000);
#ifdef DEBUG
	printf("manufacturer=0x%x\n",(uint)(value>>16));
#endif
	switch (value) {
	case MT_MANUFACT & 0xFFFF0000:	/* SHARP, MT or => Intel */
	case INTEL_ALT_MANU & 0xFFFF0000:
		info->flash_id = FLASH_MAN_INTEL;
		break;
	default:
		printf("unknown manufacturer: %x\n", (unsigned int)value);
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

	if (info->portwidth==FLASH_CFI_16BIT) {
		switch (big_endian) {
			case 0:
				value = (addr[0] & 0x0000FF00)>>8;
				break;
			case 1:
				value = (addr[0] & 0x000000FF);
				break;
		}
	}
	else if (info->portwidth == FLASH_CFI_32BIT) {
		switch (big_endian) {
			case 0:
				value = (addr[1] & 0x0000FF00)>>8;
				break;
			case 1:
				value = (addr[1] & 0x000000FF);
				break;
		}
	}

#ifdef DEBUG
	printf("deviceID=0x%x\n",(uint)value);
#endif
	switch (value) {
	case (INTEL_ID_28F016S & 0x0000FFFF):
		info->flash_id += FLASH_28F016SV;
		info->sector_count = 32;
		sector_offset = 0x10000;
		break;				/* => 2 MB		*/

	case (INTEL_ID_28F160S3 & 0x0000FFFF):
		info->flash_id += FLASH_28F160S3;
		info->sector_count = 32;
		sector_offset = 0x10000;
		break;				/* => 2 MB		*/

	case (INTEL_ID_28F320S3 & 0x0000FFFF):
		info->flash_id += FLASH_28F320S3;
		info->sector_count = 64;
		sector_offset = 0x10000;
		break;				/* => 4 MB		*/

	case (INTEL_ID_28F640J3A & 0x0000FFFF):
		info->flash_id += FLASH_28F640J3A;
		info->sector_count = 64;
		sector_offset = 0x20000;
		break;                          /* => 8 MB             */

	case SHARP_ID_28F016SCL & 0x0000FFFF:
	case SHARP_ID_28F016SCZ & 0x0000FFFF:
		info->flash_id      = FLASH_MAN_SHARP | FLASH_LH28F016SCT;
		info->sector_count  = 32;
		sector_offset = 0x10000;
		break;				/* => 2 MB		*/


	default:
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */

	}

	sector_offset = sector_offset * (info->portwidth / info->chipwidth);
	info->size = info->sector_count * sector_offset;

	/* set up sector start address table */
	for (i = 0; i < info->sector_count; i++) {
		info->start[i] = base;
		base += sector_offset;
		/* don't know how to check sector protection */
		info->protect[i] = 0;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		addr = (vu_long *)info->start[0];
		*addr = 0xFFFFFF;	/* reset bank to read array mode */
		asm("sync");
	}

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	int flag, prot, sect;
	ulong start, now, last, ready, erase_err_status;

	if (big_endian == 1) {
		ready = 0x0080;
		erase_err_status = 0x00a0;
	}
	else {
		ready = 0x8000;
		erase_err_status = 0xa000;
	}
	if ((info->portwidth / info->chipwidth)==2) {
		ready += (ready <<16);
		erase_err_status += (erase_err_status <<16);
	}

#ifdef DEBUG
	printf ("\nReady flag is 0x%lx\nErase error flag is 0x%lx", ready, erase_err_status);
#endif

	if ((s_first < 0) || (s_first > s_last)) {
		if (info->flash_id == FLASH_UNKNOWN) {
			printf ("- missing\n");
		} else {
			printf ("- no sectors to erase\n");
		}
		return 1;
	}

	if (    ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL)
	     && ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_SHARP) ) {
		printf ("Can't erase unknown flash type %08lx - aborted\n",
			info->flash_id);
		return 1;
	}

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

	if (prot) {
		printf ("- Warning: %d protected sectors will not be erased!\n",
			prot);
	} else {
		printf ("\n");
	}

#ifdef DEBUG
	printf("\nFlash Erase:\n");
#endif
	/* Make Sure Block Lock Bit is not set. */
	if(clear_block_lock_bit(info, (vu_long *)(info->start[s_first]))){
		return 1;
	}

	/* Start erase on unprotected sectors */
#if defined(DEBUG)
	printf("Begin to erase now,s_first=0x%x s_last=0x%x...\n",s_first,s_last);
#endif
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			vu_short *addr16 = (vu_short *)(info->start[sect]);
			vu_long *addr   = (vu_long *)(info->start[sect]);
			printf(".");
			switch (info->portwidth) {
				case FLASH_CFI_16BIT:
					asm("sync");
					last = start = get_timer (0);
					/* Disable interrupts which might cause a timeout here */
					flag = disable_interrupts();
					/* Reset Array */
					*addr16 = 0xffff;
					asm("sync");
					/* Clear Status Register */
					*addr16 = 0x5050;
					asm("sync");
					/* Single Block Erase Command */
					*addr16 = 0x2020;
					asm("sync");
					/* Confirm */
					*addr16 = 0xD0D0;
					asm("sync");
					if((info->flash_id & FLASH_TYPEMASK) != FLASH_LH28F016SCT) {
					    /* Resume Command, as per errata update */
					    *addr16 = 0xD0D0;
					    asm("sync");
					}
					/* re-enable interrupts if necessary */
					if (flag)
						enable_interrupts();
					/* wait at least 80us - let's wait 1 ms */
					*addr16 = 0x7070;
					udelay (1000);