board/svm_sc8xx/flash.c - github/trini/u-boot - Gitiles

 /*
  * Wolfgang Denk, DENX Software Engineering, wd@denx.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>
 #include <mpc8xx.h>

 #ifndef	CONFIG_ENV_ADDR
 #define CONFIG_ENV_ADDR	(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 #endif

 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

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

 #ifdef CONFIG_BOOT_8B
 static int my_in_8(unsigned char *addr);
 static void my_out_8(unsigned char *addr, int val);
 #endif
 #ifdef CONFIG_BOOT_16B
 static int my_in_be16(unsigned short *addr);
 static void my_out_be16(unsigned short *addr, int val);
 #endif
 #ifdef CONFIG_BOOT_32B
 static unsigned my_in_be32(unsigned *addr);
 static void my_out_be32(unsigned *addr, int val);
 #endif
 /*-----------------------------------------------------------------------
  */

 unsigned long flash_init(void)
 {
 	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 	volatile memctl8xx_t *memctl = &immap->im_memctl;
 	unsigned long size_b0, size_b1;
 	int i;

 	size_b0 = 0;
 	size_b1 = 0;
 	/* Init: no FLASHes known */
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i)
 		flash_info[i].flash_id = FLASH_UNKNOWN;

 #ifdef CONFIG_SYS_DOC_BASE
 #ifndef CONFIG_FEL8xx_AT
 	/* 32k bytes */
 	memctl->memc_or5 = (0xffff8000 | CONFIG_SYS_OR_TIMING_DOC);
 	memctl->memc_br5 = CONFIG_SYS_DOC_BASE | 0x401;
 #else
 	/* 32k bytes */
 	memctl->memc_or3 = (0xffff8000 | CONFIG_SYS_OR_TIMING_DOC);
 	memctl->memc_br3 = CONFIG_SYS_DOC_BASE | 0x401;
 #endif
 #endif
 #if defined(CONFIG_BOOT_8B)
 	size_b0 = 0x80000;	/* 512 K */

 	flash_info[0].flash_id = FLASH_MAN_AMD | FLASH_AM040;
 	flash_info[0].sector_count = 8;
 	flash_info[0].size = 0x00080000;

 	/* set up sector start address table */
 	for (i = 0; i < flash_info[0].sector_count; i++)
 		flash_info[0].start[i] = 0x40000000 + (i * 0x10000);

 	/* protect all sectors */
 	for (i = 0; i < flash_info[0].sector_count; i++)
 		flash_info[0].protect[i] = 0x1;

 #elif defined(CONFIG_BOOT_16B)
 	size_b0 = 0x400000;	/* 4MB , assume AMD29LV320B */

 	flash_info[0].flash_id = FLASH_MAN_AMD | FLASH_AM320B;
 	flash_info[0].sector_count = 67;
 	flash_info[0].size = 0x00400000;

 	/* set up sector start address table */
 	flash_info[0].start[0] = 0x40000000;
 	flash_info[0].start[1] = 0x40000000 + 0x4000;
 	flash_info[0].start[2] = 0x40000000 + 0x6000;
 	flash_info[0].start[3] = 0x40000000 + 0x8000;

 	for (i = 4; i < flash_info[0].sector_count; i++) {
 		flash_info[0].start[i] =
 			0x40000000 + 0x10000 + ((i - 4) * 0x10000);
 	}

 	/* protect all sectors */
 	for (i = 0; i < flash_info[0].sector_count; i++)
 		flash_info[0].protect[i] = 0x1;
 #endif

 #ifdef CONFIG_BOOT_32B

 	/* Static FLASH Bank configuration here - FIXME XXX */
 	size_b0 = flash_get_size((vu_long *) FLASH_BASE0_PRELIM,
 			       &flash_info[0]);

 	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 		printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
 			size_b0, size_b0 << 20);
 	}

 	size_b1 = flash_get_size((vu_long *) FLASH_BASE1_PRELIM,
 			       &flash_info[1]);

 	if (size_b1 > size_b0) {
 		printf("## ERROR: "
 			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
 			size_b1, size_b1 << 20, size_b0, size_b0 << 20);
 		flash_info[0].flash_id = FLASH_UNKNOWN;
 		flash_info[1].flash_id = FLASH_UNKNOWN;
 		flash_info[0].sector_count = -1;
 		flash_info[1].sector_count = -1;
 		flash_info[0].size = 0;
 		flash_info[1].size = 0;

 		return 0;
 	}

 	/* Remap FLASH according to real size */
 	memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH |
 				(-size_b0 & OR_AM_MSK);
 	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) |
 				BR_MS_GPCM | BR_V;

 	/* Re-do sizing to get full correct info */
 	size_b0 = flash_get_size((vu_long *) CONFIG_SYS_FLASH_BASE,
 				&flash_info[0]);

 	flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);

 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 	/* monitor protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 		CONFIG_SYS_MONITOR_BASE,
 		CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 		&flash_info[0]);
 #endif

 #ifdef	CONFIG_ENV_IS_IN_FLASH
 	/* ENV protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 		CONFIG_ENV_ADDR,
 		CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);
 #endif

 	if (size_b1) {
 		memctl->memc_or1 = CONFIG_SYS_OR_TIMING_FLASH |
 			(-size_b1 & 0xFFFF8000);
 		memctl->memc_br1 = ((CONFIG_SYS_FLASH_BASE +
 			size_b0) & BR_BA_MSK) | BR_MS_GPCM | BR_V;

 		/* Re-do sizing to get full correct info */
 		size_b1 = flash_get_size((vu_long *)(CONFIG_SYS_FLASH_BASE +
 					size_b0), &flash_info[1]);

 		flash_get_offsets(CONFIG_SYS_FLASH_BASE + size_b0,
 				  &flash_info[1]);

 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 		/* monitor protection ON by default */
 		flash_protect(FLAG_PROTECT_SET,
 			      CONFIG_SYS_MONITOR_BASE,
 			      CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 			      &flash_info[1]);
 #endif

 #ifdef	CONFIG_ENV_IS_IN_FLASH
 		/* ENV protection ON by default */
 		flash_protect(FLAG_PROTECT_SET,
 			      CONFIG_ENV_ADDR,
 			      CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
 			      &flash_info[1]);
 #endif
 	} else {
 		memctl->memc_br1 = 0;	/* invalidate bank */

 		flash_info[1].flash_id = FLASH_UNKNOWN;
 		flash_info[1].sector_count = -1;
 	}

 	flash_info[0].size = size_b0;
 	flash_info[1].size = size_b1;


 #endif /* CONFIG_BOOT_32B */

 	return size_b0 + size_b1;
 }


 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_AMD:
 		printf("AMD ");
 		break;
 	case FLASH_MAN_FUJ:
 		printf("FUJITSU ");
 		break;
 	default:
 		printf("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	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;
 	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");
 	return;
 }

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

 int flash_erase(flash_info_t *info, int s_first, int s_last)
 {
 	vu_long *addr = (vu_long *) (info->start[0]);
 	int flag, prot, sect, l_sect, in_mid, in_did;
 	ulong start, now, last;

 	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_UNKNOWN) ||
 	    (info->flash_id > FLASH_AMD_COMP)) {
 		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");
 	}

 	l_sect = -1;

 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 #if defined(CONFIG_BOOT_8B)
 	my_out_8((unsigned char *)((ulong)addr + 0x555), 0xaa);
 	my_out_8((unsigned char *)((ulong)addr + 0x2aa), 0x55);
 	my_out_8((unsigned char *)((ulong)addr + 0x555), 0x90);

 	in_mid = my_in_8((unsigned char *)addr);
 	in_did = my_in_8((unsigned char *)((ulong)addr + 1));

 	printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);

 	my_out_8((unsigned char *)addr, 0xf0);
 	udelay(1);

 	my_out_8((unsigned char *)((ulong)addr + 0x555), 0xaa);
 	my_out_8((unsigned char *)((ulong)addr + 0x2aa), 0x55);
 	my_out_8((unsigned char *)((ulong)addr + 0x555), 0x80);
 	my_out_8((unsigned char *)((ulong)addr + 0x555), 0xaa);
 	my_out_8((unsigned char *)((ulong)addr + 0x2aa), 0x55);

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (vu_long *) (info->start[sect]);
 			/*addr[0] = 0x00300030; */
 			my_out_8((unsigned char *)((ulong)addr), 0x30);
 			l_sect = sect;
 		}
 	}
 #elif defined(CONFIG_BOOT_16B)
 	my_out_be16((unsigned short *)((ulong)addr + (0xaaa)), 0xaa);
 	my_out_be16((unsigned short *)((ulong)addr + (0x554)), 0x55);
 	my_out_be16((unsigned short *)((ulong)addr + (0xaaa)), 0x90);
 	in_mid = my_in_be16((unsigned short *)addr);
 	in_did = my_in_be16((unsigned short *)((ulong)addr + 2));
 	printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);
 	my_out_be16((unsigned short *)addr, 0xf0);
 	udelay(1);
 	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xaa);
 	my_out_be16((unsigned short *)((ulong)addr + 0x554), 0x55);
 	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0x80);
 	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xaa);
 	my_out_be16((unsigned short *)((ulong)addr + 0x554), 0x55);
 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (vu_long *) (info->start[sect]);
 			my_out_be16((unsigned short *)((ulong)addr), 0x30);
 			l_sect = sect;
 		}
 	}

 #elif defined(CONFIG_BOOT_32B)
 	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0xaa);
 	my_out_be32((unsigned *)((ulong)addr + 0xaa8), 0x55);
 	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0x90);

 	in_mid = my_in_be32((unsigned *)addr);
 	in_did = my_in_be32((unsigned *)((ulong)addr + 4));

 	printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);

 	my_out_be32((unsigned *) addr, 0xf0);
 	udelay(1);

 	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0xaa);
 	my_out_be32((unsigned *)((ulong)addr + 0xaa8), 0x55);
 	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0x80);
 	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0xaa);
 	my_out_be32((unsigned *)((ulong)addr + 0xaa8), 0x55);

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (vu_long *) (info->start[sect]);
 			my_out_be32((unsigned *)((ulong)addr), 0x00300030);
 			l_sect = sect;
 		}
 	}

 #else
 #error CONFIG_BOOT_(size)B missing.
 #endif
 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts();

 	/* wait at least 80us - let's wait 1 ms */
 	udelay(1000);

 	/*
 	 * We wait for the last triggered sector
 	 */
 	if (l_sect < 0)
 		goto DONE;

 	start = get_timer(0);
 	last = start;
 	addr = (vu_long *) (info->start[l_sect]);
 #if defined(CONFIG_BOOT_8B)
 	while ((my_in_8((unsigned char *) addr) & 0x80) != 0x80)
 #elif defined(CONFIG_BOOT_16B)
 	while ((my_in_be16((unsigned short *) addr) & 0x0080) != 0x0080)
 #elif defined(CONFIG_BOOT_32B)
 	while ((my_in_be32((unsigned *) addr) & 0x00800080) != 0x00800080)
 #else
 #error CONFIG_BOOT_(size)B missing.
 #endif
 	{
 		now = get_timer(start);
 		if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
 			printf("Timeout\n");
 			return 1;
 		}
 		/* show that we're waiting */
 		if ((now - last) > 1000) {	/* every second */
 			putc('.');
 			last = now;
 		}
 	}
 DONE:
 	/* reset to read mode */
 	addr = (volatile unsigned long *) info->start[0];

 #if defined(CONFIG_BOOT_8B)
 	my_out_8((unsigned char *) addr, 0xf0);
 #elif defined(CONFIG_BOOT_16B)
 	my_out_be16((unsigned short *) addr, 0x00f0);
 #elif defined(CONFIG_BOOT_32B)
 	my_out_be32((unsigned *) addr, 0x00F000F0);	/* reset bank */
 #else
 #error CONFIG_BOOT_(size)B missing.
 #endif
 	printf(" done\n");
 	return 0;
 }

 /*
  * Copy memory to flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */

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

 	wp = (addr & ~3);	/* get lower word aligned address */

 	/*
 	 * handle unaligned start bytes
 	 */
 	l = addr - wp;

 	if (l != 0) {
 		data = 0;
 		for (i = 0, cp = wp; i < l; ++i, ++cp)
 			data = (data << 8) | (*(uchar *) cp);

 		for (; i < 4 && cnt > 0; ++i) {
 			data = (data << 8) | *src++;
 			--cnt;
 			++cp;
 		}
 		for (; cnt == 0 && i < 4; ++i, ++cp)
 			data = (data << 8) | (*(uchar *) cp);

 		rc = write_word(info, wp, data);

 		if (rc != 0)
 			return rc;

 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		data = 0;
 		for (i = 0; i < 4; ++i)
 			data = (data << 8) | *src++;

 		rc = write_word(info, wp, data);

 		if (rc != 0)
 			return rc;

 		wp += 4;
 		cnt -= 4;
 	}

 	if (cnt == 0)
 		return 0;

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 		data = (data << 8) | *src++;
 		--cnt;
 	}
 	for (; i < 4; ++i, ++cp)
 		data = (data << 8) | (*(uchar *) cp);

 	return write_word(info, wp, data);
 }

 /*
  * Write a word to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_word(flash_info_t *info, ulong dest, ulong data)
 {
 	ulong addr = (ulong) (info->start[0]);
 	ulong start;
 	int flag;
 	ulong i;
 	int data_short[2];

 	/* Check if Flash is (sufficiently) erased */
 	if (((ulong)*(ulong *)dest & data) != data)
 		return 2;

 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();
 #if defined(CONFIG_BOOT_8B)
 #ifdef DEBUG
 	{
 		int in_mid, in_did;

 		my_out_8((unsigned char *) (addr + 0x555), 0xaa);
 		my_out_8((unsigned char *) (addr + 0x2aa), 0x55);
 		my_out_8((unsigned char *) (addr + 0x555), 0x90);

 		in_mid = my_in_8((unsigned char *) addr);
 		in_did = my_in_8((unsigned char *) (addr + 1));

 		printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);

 		my_out_8((unsigned char *) addr, 0xf0);
 		udelay(1);
 	}
 #endif
 	{
 		int data_ch[4];

 		data_ch[0] = (int) ((data >> 24) & 0xff);
 		data_ch[1] = (int) ((data >> 16) & 0xff);
 		data_ch[2] = (int) ((data >> 8) & 0xff);
 		data_ch[3] = (int) (data & 0xff);

 		for (i = 0; i < 4; i++) {
 			my_out_8((unsigned char *) (addr + 0x555), 0xaa);
 			my_out_8((unsigned char *) (addr + 0x2aa), 0x55);
 			my_out_8((unsigned char *) (addr + 0x555), 0xa0);
 			my_out_8((unsigned char *) (dest + i), data_ch[i]);

 			/* re-enable interrupts if necessary */
 			if (flag)
 				enable_interrupts();

 			start = get_timer(0);
 			while ((my_in_8((unsigned char *)(dest + i))) !=
 			       (data_ch[i])) {
 				if (get_timer(start) >
 				    CONFIG_SYS_FLASH_WRITE_TOUT) {
 					return 1;
 				}
 			}
 		}		/* for */
 	}
 #elif defined(CONFIG_BOOT_16B)
 	data_short[0] = (int) (data >> 16) & 0xffff;
 	data_short[1] = (int) data & 0xffff;
 	for (i = 0; i < 2; i++) {
 		my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xaa);
 		my_out_be16((unsigned short *)((ulong)addr + 0x554), 0x55);
 		my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xa0);
 		my_out_be16((unsigned short *)(dest + (i * 2)),
 			    data_short[i]);

 		/* re-enable interrupts if necessary */
 		if (flag)
 			enable_interrupts();

 		start = get_timer(0);
 		while ((my_in_be16((unsigned short *)(dest + (i * 2)))) !=
 							(data_short[i])) {
 			if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
 				return 1;
 		}
 	}
 #elif defined(CONFIG_BOOT_32B)
 	addr[0x0555] = 0x00AA00AA;
 	addr[0x02AA] = 0x00550055;
 	addr[0x0555] = 0x00A000A0;

 	*((vu_long *)dest) = data;

 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts();

 	/* data polling for D7 */
 	start = get_timer(0);
 	while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 		if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
 			return 1;
 	}
 #endif
 	return 0;
 }

 #ifdef CONFIG_BOOT_8B
 static int my_in_8(unsigned char *addr)
 {
 	int ret;
 	__asm__ __volatile__("lbz%U1%X1 %0,%1; eieio":"=r"(ret):"m"(*addr));

 	return ret;
 }

 static void my_out_8(unsigned char *addr, int val)
 {
 	__asm__ __volatile__("stb%U0%X0 %1,%0; eieio":"=m"(*addr):"r"(val));
 }
 #endif
 #ifdef CONFIG_BOOT_16B
 static int my_in_be16(unsigned short *addr)
 {
 	int ret;
 	__asm__ __volatile__("lhz%U1%X1 %0,%1; eieio":"=r"(ret):"m"(*addr));

 	return ret;
 }

 static void my_out_be16(unsigned short *addr, int val)
 {
 	__asm__ __volatile__("sth%U0%X0 %1,%0; eieio":"=m"(*addr):"r"(val));
 }
 #endif
 #ifdef CONFIG_BOOT_32B
 static unsigned my_in_be32(unsigned *addr)
 {
 	unsigned ret;
 	__asm__ __volatile__("lwz%U1%X1 %0,%1; eieio":"=r"(ret):"m"(*addr));

 	return ret;
 }

 static void my_out_be32(unsigned *addr, int val)
 {
 	__asm__ __volatile__("stw%U0%X0 %1,%0; eieio":"=m"(*addr):"r"(val));
 }
 #endif
	/*
	* Wolfgang Denk, DENX Software Engineering, wd@denx.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>
	#include <mpc8xx.h>

	#ifndef CONFIG_ENV_ADDR
	#define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
	#endif

	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

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

	#ifdef CONFIG_BOOT_8B
	static int my_in_8(unsigned char *addr);
	static void my_out_8(unsigned char *addr, int val);
	#endif
	#ifdef CONFIG_BOOT_16B
	static int my_in_be16(unsigned short *addr);
	static void my_out_be16(unsigned short *addr, int val);
	#endif
	#ifdef CONFIG_BOOT_32B
	static unsigned my_in_be32(unsigned *addr);
	static void my_out_be32(unsigned *addr, int val);
	#endif
	/*-----------------------------------------------------------------------
	*/

	unsigned long flash_init(void)
	{
	volatile immap_t immap = (immap_t ) CONFIG_SYS_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long size_b0, size_b1;
	int i;

	size_b0 = 0;
	size_b1 = 0;
	/* Init: no FLASHes known */
	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i)
	flash_info[i].flash_id = FLASH_UNKNOWN;

	#ifdef CONFIG_SYS_DOC_BASE
	#ifndef CONFIG_FEL8xx_AT
	/* 32k bytes */
	memctl->memc_or5 = (0xffff8000 \| CONFIG_SYS_OR_TIMING_DOC);
	memctl->memc_br5 = CONFIG_SYS_DOC_BASE \| 0x401;
	#else
	/* 32k bytes */
	memctl->memc_or3 = (0xffff8000 \| CONFIG_SYS_OR_TIMING_DOC);
	memctl->memc_br3 = CONFIG_SYS_DOC_BASE \| 0x401;
	#endif
	#endif
	#if defined(CONFIG_BOOT_8B)
	size_b0 = 0x80000; /* 512 K */

	flash_info[0].flash_id = FLASH_MAN_AMD \| FLASH_AM040;
	flash_info[0].sector_count = 8;
	flash_info[0].size = 0x00080000;

	/* set up sector start address table */
	for (i = 0; i < flash_info[0].sector_count; i++)
	flash_info[0].start[i] = 0x40000000 + (i * 0x10000);

	/* protect all sectors */
	for (i = 0; i < flash_info[0].sector_count; i++)
	flash_info[0].protect[i] = 0x1;

	#elif defined(CONFIG_BOOT_16B)
	size_b0 = 0x400000; /* 4MB , assume AMD29LV320B */

	flash_info[0].flash_id = FLASH_MAN_AMD \| FLASH_AM320B;
	flash_info[0].sector_count = 67;
	flash_info[0].size = 0x00400000;

	/* set up sector start address table */
	flash_info[0].start[0] = 0x40000000;
	flash_info[0].start[1] = 0x40000000 + 0x4000;
	flash_info[0].start[2] = 0x40000000 + 0x6000;
	flash_info[0].start[3] = 0x40000000 + 0x8000;

	for (i = 4; i < flash_info[0].sector_count; i++) {
	flash_info[0].start[i] =
	0x40000000 + 0x10000 + ((i - 4) * 0x10000);
	}

	/* protect all sectors */
	for (i = 0; i < flash_info[0].sector_count; i++)
	flash_info[0].protect[i] = 0x1;
	#endif

	#ifdef CONFIG_BOOT_32B

	/* Static FLASH Bank configuration here - FIXME XXX */
	size_b0 = flash_get_size((vu_long *) FLASH_BASE0_PRELIM,
	&flash_info[0]);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
	printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	size_b0, size_b0 << 20);
	}

	size_b1 = flash_get_size((vu_long *) FLASH_BASE1_PRELIM,
	&flash_info[1]);

	if (size_b1 > size_b0) {
	printf("## ERROR: "
	"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
	size_b1, size_b1 << 20, size_b0, size_b0 << 20);
	flash_info[0].flash_id = FLASH_UNKNOWN;
	flash_info[1].flash_id = FLASH_UNKNOWN;
	flash_info[0].sector_count = -1;
	flash_info[1].sector_count = -1;
	flash_info[0].size = 0;
	flash_info[1].size = 0;

	return 0;
	}

	/* Remap FLASH according to real size */
	memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH \|
	(-size_b0 & OR_AM_MSK);
	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) \|
	BR_MS_GPCM \| BR_V;

	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *) CONFIG_SYS_FLASH_BASE,
	&flash_info[0]);

	flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);

	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
	&flash_info[0]);
	#endif

	#ifdef CONFIG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);
	#endif

	if (size_b1) {
	memctl->memc_or1 = CONFIG_SYS_OR_TIMING_FLASH \|
	(-size_b1 & 0xFFFF8000);
	memctl->memc_br1 = ((CONFIG_SYS_FLASH_BASE +
	size_b0) & BR_BA_MSK) \| BR_MS_GPCM \| BR_V;

	/* Re-do sizing to get full correct info */
	size_b1 = flash_get_size((vu_long *)(CONFIG_SYS_FLASH_BASE +
	size_b0), &flash_info[1]);

	flash_get_offsets(CONFIG_SYS_FLASH_BASE + size_b0,
	&flash_info[1]);

	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
	&flash_info[1]);
	#endif

	#ifdef CONFIG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
	&flash_info[1]);
	#endif
	} else {
	memctl->memc_br1 = 0; /* invalidate bank */

	flash_info[1].flash_id = FLASH_UNKNOWN;
	flash_info[1].sector_count = -1;
	}

	flash_info[0].size = size_b0;
	flash_info[1].size = size_b1;


	#endif /* CONFIG_BOOT_32B */

	return size_b0 + size_b1;
	}


	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_AMD:
	printf("AMD ");
	break;
	case FLASH_MAN_FUJ:
	printf("FUJITSU ");
	break;
	default:
	printf("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	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;
	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");
	return;
	}

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

	int flash_erase(flash_info_t *info, int s_first, int s_last)
	{
	vu_long addr = (vu_long ) (info->start[0]);
	int flag, prot, sect, l_sect, in_mid, in_did;
	ulong start, now, last;

	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_UNKNOWN) \|\|
	(info->flash_id > FLASH_AMD_COMP)) {
	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");
	}

	l_sect = -1;

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	#if defined(CONFIG_BOOT_8B)
	my_out_8((unsigned char *)((ulong)addr + 0x555), 0xaa);
	my_out_8((unsigned char *)((ulong)addr + 0x2aa), 0x55);
	my_out_8((unsigned char *)((ulong)addr + 0x555), 0x90);

	in_mid = my_in_8((unsigned char *)addr);
	in_did = my_in_8((unsigned char *)((ulong)addr + 1));

	printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);

	my_out_8((unsigned char *)addr, 0xf0);
	udelay(1);

	my_out_8((unsigned char *)((ulong)addr + 0x555), 0xaa);
	my_out_8((unsigned char *)((ulong)addr + 0x2aa), 0x55);
	my_out_8((unsigned char *)((ulong)addr + 0x555), 0x80);
	my_out_8((unsigned char *)((ulong)addr + 0x555), 0xaa);
	my_out_8((unsigned char *)((ulong)addr + 0x2aa), 0x55);

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (vu_long *) (info->start[sect]);
	/addr[0] = 0x00300030; /
	my_out_8((unsigned char *)((ulong)addr), 0x30);
	l_sect = sect;
	}
	}
	#elif defined(CONFIG_BOOT_16B)
	my_out_be16((unsigned short *)((ulong)addr + (0xaaa)), 0xaa);
	my_out_be16((unsigned short *)((ulong)addr + (0x554)), 0x55);
	my_out_be16((unsigned short *)((ulong)addr + (0xaaa)), 0x90);
	in_mid = my_in_be16((unsigned short *)addr);
	in_did = my_in_be16((unsigned short *)((ulong)addr + 2));
	printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);
	my_out_be16((unsigned short *)addr, 0xf0);
	udelay(1);
	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xaa);
	my_out_be16((unsigned short *)((ulong)addr + 0x554), 0x55);
	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0x80);
	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xaa);
	my_out_be16((unsigned short *)((ulong)addr + 0x554), 0x55);
	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (vu_long *) (info->start[sect]);
	my_out_be16((unsigned short *)((ulong)addr), 0x30);
	l_sect = sect;
	}
	}

	#elif defined(CONFIG_BOOT_32B)
	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0xaa);
	my_out_be32((unsigned *)((ulong)addr + 0xaa8), 0x55);
	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0x90);

	in_mid = my_in_be32((unsigned *)addr);
	in_did = my_in_be32((unsigned *)((ulong)addr + 4));

	printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);

	my_out_be32((unsigned *) addr, 0xf0);
	udelay(1);

	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0xaa);
	my_out_be32((unsigned *)((ulong)addr + 0xaa8), 0x55);
	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0x80);
	my_out_be32((unsigned *)((ulong)addr + 0x1554), 0xaa);
	my_out_be32((unsigned *)((ulong)addr + 0xaa8), 0x55);

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (vu_long *) (info->start[sect]);
	my_out_be32((unsigned *)((ulong)addr), 0x00300030);
	l_sect = sect;
	}
	}

	#else
	#error CONFIG_BOOT_(size)B missing.
	#endif
	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();

	/* wait at least 80us - let's wait 1 ms */
	udelay(1000);

	/*
	* We wait for the last triggered sector
	*/
	if (l_sect < 0)
	goto DONE;

	start = get_timer(0);
	last = start;
	addr = (vu_long *) (info->start[l_sect]);
	#if defined(CONFIG_BOOT_8B)
	while ((my_in_8((unsigned char *) addr) & 0x80) != 0x80)
	#elif defined(CONFIG_BOOT_16B)
	while ((my_in_be16((unsigned short *) addr) & 0x0080) != 0x0080)
	#elif defined(CONFIG_BOOT_32B)
	while ((my_in_be32((unsigned *) addr) & 0x00800080) != 0x00800080)
	#else
	#error CONFIG_BOOT_(size)B missing.
	#endif
	{
	now = get_timer(start);
	if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf("Timeout\n");
	return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	putc('.');
	last = now;
	}
	}
	DONE:
	/* reset to read mode */
	addr = (volatile unsigned long *) info->start[0];

	#if defined(CONFIG_BOOT_8B)
	my_out_8((unsigned char *) addr, 0xf0);
	#elif defined(CONFIG_BOOT_16B)
	my_out_be16((unsigned short *) addr, 0x00f0);
	#elif defined(CONFIG_BOOT_32B)
	my_out_be32((unsigned ) addr, 0x00F000F0); / reset bank */
	#else
	#error CONFIG_BOOT_(size)B missing.
	#endif
	printf(" done\n");
	return 0;
	}

	/*
	* Copy memory to flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/

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

	wp = (addr & ~3); /* get lower word aligned address */

	/*
	* handle unaligned start bytes
	*/
	l = addr - wp;

	if (l != 0) {
	data = 0;
	for (i = 0, cp = wp; i < l; ++i, ++cp)
	data = (data << 8) \| ((uchar ) cp);

	for (; i < 4 && cnt > 0; ++i) {
	data = (data << 8) \| *src++;
	--cnt;
	++cp;
	}
	for (; cnt == 0 && i < 4; ++i, ++cp)
	data = (data << 8) \| ((uchar ) cp);

	rc = write_word(info, wp, data);

	if (rc != 0)
	return rc;

	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = 0;
	for (i = 0; i < 4; ++i)
	data = (data << 8) \| *src++;

	rc = write_word(info, wp, data);

	if (rc != 0)
	return rc;

	wp += 4;
	cnt -= 4;
	}

	if (cnt == 0)
	return 0;

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
	data = (data << 8) \| *src++;
	--cnt;
	}
	for (; i < 4; ++i, ++cp)
	data = (data << 8) \| ((uchar ) cp);

	return write_word(info, wp, data);
	}

	/*
	* Write a word to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_word(flash_info_t *info, ulong dest, ulong data)
	{
	ulong addr = (ulong) (info->start[0]);
	ulong start;
	int flag;
	ulong i;
	int data_short[2];

	/* Check if Flash is (sufficiently) erased */
	if (((ulong)(ulong )dest & data) != data)
	return 2;

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();
	#if defined(CONFIG_BOOT_8B)
	#ifdef DEBUG
	{
	int in_mid, in_did;

	my_out_8((unsigned char *) (addr + 0x555), 0xaa);
	my_out_8((unsigned char *) (addr + 0x2aa), 0x55);
	my_out_8((unsigned char *) (addr + 0x555), 0x90);

	in_mid = my_in_8((unsigned char *) addr);
	in_did = my_in_8((unsigned char *) (addr + 1));

	printf(" man ID=0x%x, dev ID=0x%x.\n", in_mid, in_did);

	my_out_8((unsigned char *) addr, 0xf0);
	udelay(1);
	}
	#endif
	{
	int data_ch[4];

	data_ch[0] = (int) ((data >> 24) & 0xff);
	data_ch[1] = (int) ((data >> 16) & 0xff);
	data_ch[2] = (int) ((data >> 8) & 0xff);
	data_ch[3] = (int) (data & 0xff);

	for (i = 0; i < 4; i++) {
	my_out_8((unsigned char *) (addr + 0x555), 0xaa);
	my_out_8((unsigned char *) (addr + 0x2aa), 0x55);
	my_out_8((unsigned char *) (addr + 0x555), 0xa0);
	my_out_8((unsigned char *) (dest + i), data_ch[i]);

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();

	start = get_timer(0);
	while ((my_in_8((unsigned char *)(dest + i))) !=
	(data_ch[i])) {
	if (get_timer(start) >
	CONFIG_SYS_FLASH_WRITE_TOUT) {
	return 1;
	}
	}
	} /* for */
	}
	#elif defined(CONFIG_BOOT_16B)
	data_short[0] = (int) (data >> 16) & 0xffff;
	data_short[1] = (int) data & 0xffff;
	for (i = 0; i < 2; i++) {
	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xaa);
	my_out_be16((unsigned short *)((ulong)addr + 0x554), 0x55);
	my_out_be16((unsigned short *)((ulong)addr + 0xaaa), 0xa0);
	my_out_be16((unsigned short )(dest + (i 2)),
	data_short[i]);

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();

	start = get_timer(0);
	while ((my_in_be16((unsigned short )(dest + (i 2)))) !=
	(data_short[i])) {
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
	return 1;
	}
	}
	#elif defined(CONFIG_BOOT_32B)
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00A000A0;

	((vu_long )dest) = data;

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();

	/* data polling for D7 */
	start = get_timer(0);
	while ((((vu_long )dest) & 0x00800080) != (data & 0x00800080)) {
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
	return 1;
	}
	#endif
	return 0;
	}

	#ifdef CONFIG_BOOT_8B
	static int my_in_8(unsigned char *addr)
	{
	int ret;
	__asm__ __volatile__("lbz%U1%X1 %0,%1; eieio":"=r"(ret):"m"(*addr));

	return ret;
	}

	static void my_out_8(unsigned char *addr, int val)
	{
	__asm__ __volatile__("stb%U0%X0 %1,%0; eieio":"=m"(*addr):"r"(val));
	}
	#endif
	#ifdef CONFIG_BOOT_16B
	static int my_in_be16(unsigned short *addr)
	{
	int ret;
	__asm__ __volatile__("lhz%U1%X1 %0,%1; eieio":"=r"(ret):"m"(*addr));

	return ret;
	}

	static void my_out_be16(unsigned short *addr, int val)
	{
	__asm__ __volatile__("sth%U0%X0 %1,%0; eieio":"=m"(*addr):"r"(val));
	}
	#endif
	#ifdef CONFIG_BOOT_32B
	static unsigned my_in_be32(unsigned *addr)
	{
	unsigned ret;
	__asm__ __volatile__("lwz%U1%X1 %0,%1; eieio":"=r"(ret):"m"(*addr));

	return ret;
	}

	static void my_out_be32(unsigned *addr, int val)
	{
	__asm__ __volatile__("stw%U0%X0 %1,%0; eieio":"=m"(*addr):"r"(val));
	}
	#endif