flash.c

from [e-mail] 电路原理图和详细说明： amd.9966.org或者 arm.9966.org 都是原创,包括boot, loader,u-boot,linu

/*
 * (C) Copyright 2002-2004
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * (C) Copyright 2002 Jun Gu <[e-mail]>
 * Add support for Am29F016D and dynamic switch setting.
 *
 * 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
 */

/*
 * Modified 4/5/2001
 * Wait for completion of each sector erase command issued
 * 4/5/2001
 * Chris Hallinan - DS4.COM, Inc. - [e-mail]
 */

/*
 * Ported to XPedite1000, 1/2 mb boot flash only
 * Travis B. Sawyer, <[e-mail]>
 */

#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>


#undef DEBUG
#ifdef DEBUG
#define DEBUGF(x...) printf(x)
#else
#define DEBUGF(x...)
#endif /* DEBUG */

#define BOOT_SMALL_FLASH	32		/* 00100000 */
#define FLASH_ONBD_N		2		/* 00000010 */
#define FLASH_SRAM_SEL		1		/* 00000001 */

#define BOOT_SMALL_FLASH_VAL	4
#define FLASH_ONBD_N_VAL	2
#define FLASH_SRAM_SEL_VAL	1


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

static unsigned long flash_addr_table[8][CFG_MAX_FLASH_BANKS] = {
	{0xfff80000},	/* 0:000: configuraton 3 */
	{0xfff90000},	/* 1:001: configuraton 4 */
	{0xfffa0000},	/* 2:010: configuraton 7 */
	{0xfffb0000},	/* 3:011: configuraton 8 */
	{0xfffc0000},	/* 4:100: configuraton 1 */
	{0xfffd0000},	/* 5:101: configuraton 2 */
	{0xfffe0000},	/* 6:110: configuraton 5 */
	{0xffff0000}	/* 7:111: configuraton 6 */
};

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);


#ifdef CONFIG_XPEDITE1K
#define ADDR0		0x5555
#define ADDR1		0x2aaa
#define FLASH_WORD_SIZE unsigned char
#endif

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

unsigned long flash_init (void)
{
	unsigned long total_b = 0;
	unsigned long size_b[CFG_MAX_FLASH_BANKS];
	unsigned short index = 0;
	int i;


	DEBUGF("\n");
	DEBUGF("FLASH: Index: %d\n", index);

	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
		flash_info[i].sector_count = -1;
		flash_info[i].size = 0;

		/* check whether the address is 0 */
		if (flash_addr_table[index][i] == 0) {
			continue;
		}

		/* call flash_get_size() to initialize sector address */
		size_b[i] = flash_get_size(
			(vu_long *)flash_addr_table[index][i], &flash_info[i]);
		flash_info[i].size = size_b[i];
		if (flash_info[i].flash_id == FLASH_UNKNOWN) {
			printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
				i, size_b[i], size_b[i]<<20);
			flash_info[i].sector_count = -1;
			flash_info[i].size = 0;
		}

		total_b += flash_info[i].size;
	}

	return total_b;
}


/*-----------------------------------------------------------------------
 */
void flash_print_info  (flash_info_t *info)
{
	int i;
	int k;
	int size;
	int erased;
	volatile unsigned long *flash;

	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;
	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
	case FLASH_MAN_SST:	printf ("SST ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AMD016:	printf ("AM29F016D (16 Mbit, uniform sector size)\n");
		break;
	case FLASH_AM040:	printf ("AM29F040 (512 Kbit, uniform sector size)\n");
		break;
	case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
		break;
	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
		break;
	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
		break;
	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
		break;
	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
		break;
	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
		break;
	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
		break;
	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
		break;
	case FLASH_SST800A:	printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
		break;
	case FLASH_SST160A:	printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
		break;
	default:		printf ("Unknown Chip Type\n");
		break;
	}

	printf ("  Size: %ld KB in %d Sectors\n",
		info->size >> 10, info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
		/*
		 * Check if whole sector is erased
		 */
		if (i != (info->sector_count-1))
			size = info->start[i+1] - info->start[i];
		else
			size = info->start[0] + info->size - info->start[i];
		erased = 1;
		flash = (volatile unsigned long *)info->start[i];
		size = size >> 2;	 /* divide by 4 for longword access */
		for (k=0; k<size; k++)
		{
			if (*flash++ != 0xffffffff)
			{
				erased = 0;
				break;
			}
		}

		if ((i % 5) == 0)
			printf ("\n   ");
			printf (" %08lX%s%s",
				info->start[i],
				erased ? " E" : "  ",
				info->protect[i] ? "RO " : "   "
				);
			}
		printf ("\n");
		return;
	}

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


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

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

	DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr );

	/* Write auto select command: read Manufacturer ID */
	udelay(10000);
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	udelay(1000);
	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	udelay(1000);
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
	udelay(1000);

#ifdef CONFIG_ADCIOP
	value = addr2[2];
#else
	value = addr2[0];
#endif

	DEBUGF("FLASH MANUFACT: %x\n", value);

	switch (value) {
	case (FLASH_WORD_SIZE)AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	case (FLASH_WORD_SIZE)FUJ_MANUFACT:
		info->flash_id = FLASH_MAN_FUJ;
		break;
	case (FLASH_WORD_SIZE)SST_MANUFACT:
		info->flash_id = FLASH_MAN_SST;
		break;
	case (FLASH_WORD_SIZE)STM_MANUFACT:
		info->flash_id = FLASH_MAN_STM;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

#ifdef CONFIG_ADCIOP
	value = addr2[0];			/* device ID		*/
	debug ("\ndev_code=%x\n", value);
#else
	value = addr2[1];			/* device ID		*/
#endif

	DEBUGF("\nFLASH DEVICEID: %x\n", value);

	switch (value) {
	case (FLASH_WORD_SIZE)AMD_ID_LV040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x00080000; /* => 512 kb */
		break;

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

	}

	/* set up sector start address table */
	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
		    (info->flash_id  == FLASH_AM040) ||
		    (info->flash_id  == FLASH_AMD016)) {
		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;