flash.c

嵌入式ARM的一些源代码

/*
 * (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 <ppcboot.h>
#include <mpc8xx.h>

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

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info);

int flash_write (uchar *, ulong, ulong);
flash_info_t *addr2info (ulong);

static int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt);
static int write_word (flash_info_t *info, ulong dest, ulong data);
static void flash_get_offsets (ulong base, flash_info_t *info);
static int  flash_protect (int flag, ulong from, ulong to, flash_info_t *info);

/*-----------------------------------------------------------------------
 * Protection Flags:
 */
#define FLAG_PROTECT_SET	0x01
#define FLAG_PROTECT_CLEAR	0x02

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

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

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

	/* 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);
	}

	if (FLASH_BASE1_PRELIM != 0x0) {
		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);
		}
	} else {
		size_b1 = 0;
	}

	/* Remap FLASH according to real size */
    memctl->memc_or0 = CFG_OR0_PRELIM;
    memctl->memc_br0 = CFG_BR0_PRELIM;

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

	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);

	/* monitor protection ON by default */
	(void)flash_protect(FLAG_PROTECT_SET, CFG_FLASH_BASE,CFG_FLASH_BASE+CFG_MONITOR_LEN-1, &flash_info[0]);

	if (size_b1)
	{
		memctl->memc_or1 = CFG_OR1_PRELIM;
		memctl->memc_br1 = CFG_BR1_PRELIM;

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

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

		/* monitor protection ON by default */
		(void)flash_protect(FLAG_PROTECT_SET, CFG_FLASH_BASE, CFG_FLASH_BASE+CFG_MONITOR_LEN-1, &flash_info[1]);
	}
	else
	{
	    memctl->memc_or1 = CFG_OR1_PRELIM;
		memctl->memc_br1 = CFG_BR1_PRELIM;

		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;

	return (size_b0 + size_b1);
}

/*-----------------------------------------------------------------------
 * Check or set protection status for monitor sectors
 *
 * The monitor always occupies the _first_ part of the _first_ Flash bank.
 */
static int  flash_protect (int flag, ulong from, ulong to, flash_info_t *info)
{
	ulong b_end = info->start[0] + info->size - 1;	/* bank end address */
	int rc    =  0;
	int first = -1;
	int last  = -1;
	int i;

	if (to < info->start[0]) {
		return (0);
	}

	for (i=0; i<info->sector_count; ++i) {
		ulong end;		/* last address in current sect	*/
		short s_end;

		s_end = info->sector_count - 1;

		end = (i == s_end) ? b_end : info->start[i + 1] - 1;

		if (from > end) {
			continue;
		}
		if (to < info->start[i]) {
			continue;
		}

		if (from == info->start[i]) {
			first = i;
			if (last < 0) {
				last = s_end;
			}
		}
		if (to  == end) {
			last  = i;
			if (first < 0) {
				first = 0;
			}
		}
	}

	for (i=first; i<=last; ++i) {
		if (flag & FLAG_PROTECT_CLEAR) {
			info->protect[i] = 0;
		} else if (flag & FLAG_PROTECT_SET) {
			info->protect[i] = 1;
		}
		if (info->protect[i]) {
			rc = 1;
		}
	}
	return (rc);
}


/*-----------------------------------------------------------------------
 */
static void flash_get_offsets (ulong base, flash_info_t *info)
{
	int i;

	/* set up sector start adress table */
	if (info->flash_id & FLASH_BTYPE)
	{
		/* set sector offsets for bottom boot block type	*/
		for (i = 0; i < info->sector_count; i++)
		{
			info->start[i] = base + (i * 0x00040000);
		}
	}
	else
	{
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		for (; i >= 0; i--)
		{
			info->start[i] = base + i * 0x00040000;
		}
	}

}

/*-----------------------------------------------------------------------
 */
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_AM040B:	printf ("AM29F040B (4 Mbit, bottom boot sect)\n");
			break;
		case FLASH_AM040T:	printf ("AM29F040T (4 Mbit, top boot sect)\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;
		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");
}

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


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

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

static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
#if 0
	ulong base = (ulong)addr;
#endif
	uchar value;

	/* Write auto select command: read Manufacturer ID */
#if 0
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00900090;
#else
	addr[0x0555] = 0xAAAAAAAA;
	addr[0x02AA] = 0x55555555;
	addr[0x0555] = 0x90909090;
#endif

	value = addr[0];

	switch (value)
	{
		case AMD_MANUFACT:case 0x01:
			info->flash_id = FLASH_MAN_AMD;
		break;

		case FUJ_MANUFACT:
			info->flash_id = FLASH_MAN_FUJ;
		break;

		default:
			info->flash_id = FLASH_UNKNOWN;
			info->sector_count = 0;
			info->size = 0;
			break;
	}

	value = addr[1];			/* device ID		*/

	switch (value)
	{
		case AMD_ID_F040B:
			info->flash_id += FLASH_AM040B;
			info->sector_count = 8;
			info->size = 0x00200000;
			break;				/* => 2 MB		*/

		case AMD_ID_LV400T:
			info->flash_id += FLASH_AM400T;
			info->sector_count = 11;
			info->size = 0x00100000;
			break;				/* => 1 MB		*/

		case AMD_ID_LV400B:
			info->flash_id += FLASH_AM400B;
			info->sector_count = 11;
			info->size = 0x00100000;
			break;				/* => 1 MB		*/

		case AMD_ID_LV800T:
			info->flash_id += FLASH_AM800T;
			info->sector_count = 19;
			info->size = 0x00200000;
			break;				/* => 2 MB		*/

		case AMD_ID_LV800B:
			info->flash_id += FLASH_AM800B;
			info->sector_count = 19;
			info->size = 0x00200000;
			break;				/* => 2 MB		*/

		case AMD_ID_LV160T:
			info->flash_id += FLASH_AM160T;
			info->sector_count = 35;
			info->size = 0x00400000;
			break;				/* => 4 MB		*/

		case AMD_ID_LV160B:
			info->flash_id += FLASH_AM160B;
			info->sector_count = 35;
			info->size = 0x00400000;
			break;				/* => 4 MB		*/
#if 0	/* enable when device IDs are available */
		case AMD_ID_LV320T:
			info->flash_id += FLASH_AM320T;
			info->sector_count = 67;
			info->size = 0x00800000;
			break;				/* => 8 MB		*/