strataflash.c

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

 */
static int flash_status_check(flash_info_t * info, ulong sector, ulong tout,
			      char *prompt)
{
	ulong start;

	/* Wait for command completion */
	start = get_timer(0);
	while (!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
		if (get_timer(start) > info->erase_blk_tout) {
			printf("Flash %s timeout at address %lx\n", prompt,
			       info->start[sector]);
			flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
			return ERR_TIMOUT;
		}
	}
	return ERR_OK;
}

/*-----------------------------------------------------------------------
 * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
 * This routine sets the flash to read-array mode.
 */
static int flash_full_status_check(flash_info_t * info, ulong sector,
				   ulong tout, char *prompt)
{
	int retcode;
	retcode = flash_status_check(info, sector, tout, prompt);
	if ((retcode == ERR_OK)
	    && !flash_isequal(info, sector, 0, FLASH_STATUS_DONE)) {
		retcode = ERR_INVAL;
		printf("Flash %s error at address %lx\n", prompt,
		       info->start[sector]);
		if (flash_isset
		    (info, sector, 0,
		     FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)) {
			printf("Command Sequence Error.\n");
		} else if (flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)) {
			printf("Block Erase Error.\n");
			retcode = ERR_NOT_ERASED;
		} else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
			printf("Locking Error\n");
		}
		if (flash_isset(info, sector, 0, FLASH_STATUS_DPS)) {
			printf("Block locked.\n");
			retcode = ERR_PROTECTED;
		}
		if (flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
			printf("Vpp Low Error.\n");
	}
	flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
	return retcode;
}

/*-----------------------------------------------------------------------
 */
static void flash_add_byte(flash_info_t * info, cfiword_t * cword, uchar c)
{
	switch (info->portwidth) {
	case FLASH_CFI_8BIT:
		cword->c = c;
		break;
	case FLASH_CFI_16BIT:
		cword->w = (cword->w << 8) | c;
		break;
	case FLASH_CFI_32BIT:
		cword->l = (cword->l << 8) | c;
	}
}

/*-----------------------------------------------------------------------
 * make a proper sized command based on the port and chip widths
 */
static void flash_make_cmd(flash_info_t * info, uchar cmd, void *cmdbuf)
{
	int i;
	uchar *cp = (uchar *) cmdbuf;
	for (i = 0; i < info->portwidth; i++)
		*cp++ = ((i + 1) % info->chipwidth) ? '\0' : cmd;
}

/*
 * Write a proper sized command to the correct address
 */
static void flash_write_cmd(flash_info_t * info, int sect, uchar offset,
			    uchar cmd)
{

	volatile cfiptr_t addr;
	cfiword_t cword;
	addr.cp = flash_make_addr(info, sect, offset);
	flash_make_cmd(info, cmd, &cword);
	switch (info->portwidth) {
	case FLASH_CFI_8BIT:
		*addr.cp = cword.c;
		break;
	case FLASH_CFI_16BIT:
		*addr.wp = cword.w;
		break;
	case FLASH_CFI_32BIT:
		*addr.lp = cword.l;
		break;
	}
}

/*-----------------------------------------------------------------------
 */
static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
{
	cfiptr_t cptr;
	cfiword_t cword;
	int retval;
	cptr.cp = flash_make_addr(info, sect, offset);
	flash_make_cmd(info, cmd, &cword);
	switch (info->portwidth) {
	case FLASH_CFI_8BIT:
		retval = (cptr.cp[0] == cword.c);
		break;
	case FLASH_CFI_16BIT:
		retval = (cptr.wp[0] == cword.w);
		break;
	case FLASH_CFI_32BIT:
		retval = (cptr.lp[0] == cword.l);
		break;
	default:
		retval = 0;
		break;
	}
	return retval;
}

/*-----------------------------------------------------------------------
 */
static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd)
{
	cfiptr_t cptr;
	cfiword_t cword;
	int retval;
	cptr.cp = flash_make_addr(info, sect, offset);
	flash_make_cmd(info, cmd, &cword);
	switch (info->portwidth) {
	case FLASH_CFI_8BIT:
		retval = ((cptr.cp[0] & cword.c) == cword.c);
		break;
	case FLASH_CFI_16BIT:
		retval = ((cptr.wp[0] & cword.w) == cword.w);
		break;
	case FLASH_CFI_32BIT:
		retval = ((cptr.lp[0] & cword.l) == cword.l);
		break;
	default:
		retval = 0;
		break;
	}
	return retval;
}

/*-----------------------------------------------------------------------
 * detect if flash is compatible with the Common Flash Interface (CFI)
 * http://www.jedec.org/download/search/jesd68.pdf
 *
 */
static int flash_detect_cfi(flash_info_t * info)
{

	for (info->portwidth = FLASH_CFI_8BIT;
	     info->portwidth <= FLASH_CFI_32BIT; info->portwidth <<= 1) {
		for (info->chipwidth = FLASH_CFI_BY8;
		     info->chipwidth <= info->portwidth;
		     info->chipwidth <<= 1) {
			flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
			flash_write_cmd(info, 0, FLASH_OFFSET_CFI,
					FLASH_CMD_CFI);
			if (flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP, 'Q')
			    && flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1,
					     'R')
			    && flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2,
					     'Y'))
				return 1;
		}
	}
	return 0;
}

/*
 * The following code cannot be run from FLASH!
 *
 */
static ulong flash_get_size(ulong base, int banknum)
{
	flash_info_t *info = &flash_info[banknum];
	int i, j;
	int sect_cnt;
	unsigned long sector;
	unsigned long tmp;
	int size_ratio = 0;
	uchar num_erase_regions;
	int erase_region_size;
	int erase_region_count;

	info->start[0] = base;
#if 0
	invalidate_dcache_range(base, base + 0x400);
#endif
	if (flash_detect_cfi(info)) {

		size_ratio = info->portwidth / info->chipwidth;
		num_erase_regions =
		    flash_read_uchar(info, FLASH_OFFSET_NUM_ERASE_REGIONS);

		sect_cnt = 0;
		sector = base;
		for (i = 0; i < num_erase_regions; i++) {
			if (i > NUM_ERASE_REGIONS) {
				printf("%d erase regions found, only %d used\n",
				       num_erase_regions, NUM_ERASE_REGIONS);
				break;
			}
			tmp =
			    flash_read_long(info, 0,
					    FLASH_OFFSET_ERASE_REGIONS);
			erase_region_size =
			    (tmp & 0xffff) ? ((tmp & 0xffff) * 256) : 128;
			tmp >>= 16;
			erase_region_count = (tmp & 0xffff) + 1;
			for (j = 0; j < erase_region_count; j++) {
				info->start[sect_cnt] = sector;
				sector += (erase_region_size * size_ratio);
				info->protect[sect_cnt] =
				    flash_isset(info, sect_cnt,
						FLASH_OFFSET_PROTECT,
						FLASH_STATUS_PROTECT);
				sect_cnt++;
			}
		}

		info->sector_count = sect_cnt;
		/* multiply the size by the number of chips */
		info->size =
		    (1 << flash_read_uchar(info, FLASH_OFFSET_SIZE)) *
		    size_ratio;
		info->buffer_size =
		    (1 << flash_read_ushort(info, 0, FLASH_OFFSET_BUFFER_SIZE));
		tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_ETOUT);
		info->erase_blk_tout =
		    (tmp *
		     (1 << flash_read_uchar(info, FLASH_OFFSET_EMAX_TOUT)));
		tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WBTOUT);
		info->buffer_write_tout =
		    (tmp *
		     (1 << flash_read_uchar(info, FLASH_OFFSET_WBMAX_TOUT)));
		tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WTOUT);
		info->write_tout =
		    (tmp *
		     (1 << flash_read_uchar(info, FLASH_OFFSET_WMAX_TOUT))) /
		    1000;
		info->flash_id = FLASH_MAN_CFI;
	}

	flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
#ifdef DEBUG_FLASH
	printf("portwidth=%d chipwidth=%d\n", info->portwidth, info->chipwidth);	/* test-only */
#endif
#ifdef DEBUG_FLASH
	printf("found %d erase regions\n", num_erase_regions);
#endif
#ifdef DEBUG_FLASH
	printf("size=%08x sectors=%08x \n", info->size, info->sector_count);
#endif
	return (info->size);
}

/*-----------------------------------------------------------------------
 */
static int flash_write_cfiword(flash_info_t * info, ulong dest, cfiword_t cword)
{

	cfiptr_t ctladdr;
	cfiptr_t cptr;
	int flag;

	ctladdr.cp = flash_make_addr(info, 0, 0);
	cptr.cp = (uchar *) dest;

	/* Check if Flash is (sufficiently) erased */
	switch (info->portwidth) {
	case FLASH_CFI_8BIT:
		flag = ((cptr.cp[0] & cword.c) == cword.c);
		break;
	case FLASH_CFI_16BIT:
		flag = ((cptr.wp[0] & cword.w) == cword.w);
		break;
	case FLASH_CFI_32BIT:
		flag = ((cptr.lp[0] & cword.l) == cword.l);
		break;
	default:
		return 2;
	}
	if (!flag)
		return 2;

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

	flash_write_cmd(info, 0, 0, FLASH_CMD_CLEAR_STATUS);
	flash_write_cmd(info, 0, 0, FLASH_CMD_WRITE);

	switch (info->portwidth) {
	case FLASH_CFI_8BIT:
		cptr.cp[0] = cword.c;
		break;
	case FLASH_CFI_16BIT:
		cptr.wp[0] = cword.w;
		break;
	case FLASH_CFI_32BIT:
		cptr.lp[0] = cword.l;
		break;
	}

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

	return flash_full_status_check(info, 0, info->write_tout, "write");
}

#ifdef CFG_FLASH_USE_BUFFER_WRITE

/* loop through the sectors from the highest address
 * when the passed address is greater or equal to the sector address
 * we have a match
 */
static int find_sector(flash_info_t * info, ulong addr)
{
	int sector;
	for (sector = info->sector_count - 1; sector >= 0; sector--) {
		if (addr >= info->start[sector])
			break;
	}
	return sector;
}

static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp,
				 int len)
{

	int sector;
	int cnt;
	int retcode;
	volatile cfiptr_t src;
	volatile cfiptr_t dst;

	src.cp = cp;
	dst.cp = (uchar *) dest;
	sector = find_sector(info, dest);
	flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
	flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
	if ((retcode = flash_status_check(info, sector, info->buffer_write_tout,
					  "write to buffer")) == ERR_OK) {
		switch (info->portwidth) {
		case FLASH_CFI_8BIT:
			cnt = len;
			break;
		case FLASH_CFI_16BIT:
			cnt = len >> 1;
			break;
		case FLASH_CFI_32BIT:
			cnt = len >> 2;
			break;
		default:
			return ERR_INVAL;
			break;
		}
		flash_write_cmd(info, sector, 0, (uchar) cnt - 1);
		while (cnt-- > 0) {
			switch (info->portwidth) {
			case FLASH_CFI_8BIT:
				*dst.cp++ = *src.cp++;
				break;
			case FLASH_CFI_16BIT:
				*dst.wp++ = *src.wp++;
				break;
			case FLASH_CFI_32BIT:
				*dst.lp++ = *src.lp++;
				break;
			default:
				return ERR_INVAL;
				break;
			}
		}
		flash_write_cmd(info, sector, 0,
				FLASH_CMD_WRITE_BUFFER_CONFIRM);
		retcode =
		    flash_full_status_check(info, sector,
					    info->buffer_write_tout,
					    "buffer write");
	}
	flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
	return retcode;
}
#endif				/* CFG_USE_FLASH_BUFFER_WRITE */