flash.c

AT91RM9200的完整启动代码：包括loader, boot及U-boot三部分均已编译通过！欢迎下载使用！

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
		/* D0 = 1 if protected */
		addr = (volatile unsigned long *)(info->start[i]);
		info->protect[i] = addr[2] & 1;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		addr = (volatile unsigned long *)info->start[0];

		*addr = 0x00F000F0;	/* reset bank */
	}

	return (info->size);
}
#endif

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

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
	{
		if ((now = get_timer(start)) > CFG_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
	 */
	if ((l = addr - wp) != 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);
		}

		if ((rc = write_word(info, wp, data)) != 0) {
			return (rc);
		}
		wp += 4;
	}

	/*
	 * handle word aligned part
	 */
	while (cnt >= 4) {
		data = 0;
		for (i=0; i<4; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_word(info, wp, data)) != 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,last;
	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);
	last  = start;
	  while(  ( my_in_8((unsigned char *) (dest+i)) ) != ( data_ch[i]  ) ) {
		  if (get_timer(start) > CFG_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);
	last  = start;
	  while(  ( my_in_be16((unsigned short *) (dest+(i*2))) ) != ( data_short[i]  ) ) {
		  if (get_timer(start) > CFG_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) > CFG_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