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！

				info->size = 0x00080000;
				break;				/* => 0.5 MB		*/

			case (FLASH_WORD_SIZE)AMD_ID_LV800T:
				info->flash_id += FLASH_AM800T;
				info->sector_count = 19;
				info->size = 0x00100000;
				break;				/* => 1 MB		*/

			case (FLASH_WORD_SIZE)AMD_ID_LV800B:
				info->flash_id += FLASH_AM800B;
				info->sector_count = 19;
				info->size = 0x00100000;
				break;				/* => 1 MB		*/

			case (FLASH_WORD_SIZE)AMD_ID_LV160T:
				info->flash_id += FLASH_AM160T;
				info->sector_count = 35;
				info->size = 0x00200000;
				break;				/* => 2 MB		*/

			case (FLASH_WORD_SIZE)AMD_ID_LV160B:
				info->flash_id += FLASH_AM160B;
				info->sector_count = 35;
				info->size = 0x00200000;
				break;				/* => 2 MB		*/
#if 0	/* enable when device IDs are available */
			case (FLASH_WORD_SIZE)AMD_ID_LV320T:
				info->flash_id += FLASH_AM320T;
				info->sector_count = 67;
				info->size = 0x00400000;
				break;				/* => 4 MB		*/

			case (FLASH_WORD_SIZE)AMD_ID_LV320B:
				info->flash_id += FLASH_AM320B;
				info->sector_count = 67;
				info->size = 0x00400000;
				break;				/* => 4 MB		*/
#endif
			case (FLASH_WORD_SIZE)SST_ID_xF800A:
				info->flash_id += FLASH_SST800A;
				info->sector_count = 16;
				info->size = 0x00100000;
				break;				/* => 1 MB		*/

			case (FLASH_WORD_SIZE)SST_ID_xF160A:
				info->flash_id += FLASH_SST160A;
				info->sector_count = 32;
				info->size = 0x00200000;
				break;				/* => 2 MB		*/

			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;
					info->start[2] = base + 0x00006000;
					info->start[3] = base + 0x00008000;
					for (i = 4; i < info->sector_count; i++) {
						info->start[i] = base + (i * 0x00010000) - 0x00030000;
					}
				} else {
					/* set sector offsets for top boot block type		*/
					i = info->sector_count - 1;
					info->start[i--] = base + info->size - 0x00004000;
					info->start[i--] = base + info->size - 0x00006000;
					info->start[i--] = base + info->size - 0x00008000;
					for (; i >= 0; i--) {
						info->start[i] = base + i * 0x00010000;
					}
				}
			}

			/* 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 */
#ifdef CONFIG_ADCIOP
				addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
				info->protect[i] = addr2[4] & 1;
#else
				addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
				if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
					info->protect[i] = 0;
				else
					info->protect[i] = addr2[2] & 1;
#endif
			}

			/*
			 * Prevent writes to uninitialized FLASH.
			 */
			if (info->flash_id != FLASH_UNKNOWN) {
#if 0 /* test-only */
#ifdef CONFIG_ADCIOP
				addr2 = (volatile unsigned char *)info->start[0];
				addr2[ADDR0] = 0xAA;
				addr2[ADDR1] = 0x55;
				addr2[ADDR0] = 0xF0;  /* reset bank */
#else
				addr2 = (FLASH_WORD_SIZE *)info->start[0];
				*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
#endif
#else /* test-only */
				addr2 = (FLASH_WORD_SIZE *)info->start[0];
				*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
#endif /* test-only */
			}

			return (info->size);
		}

	int wait_for_DQ7(flash_info_t *info, int sect)
		{
			ulong start, now, last;
			volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);

			start = get_timer (0);
			last  = start;
			while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
				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;
				}
			}
			return 0;
		}

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

	int	flash_erase (flash_info_t *info, int s_first, int s_last)
		{
			volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
			volatile FLASH_WORD_SIZE *addr2;
			int flag, prot, sect, l_sect;
			int i;

			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) {
				printf ("Can't erase unknown flash type - aborted\n");
				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();

			/* Start erase on unprotected sectors */
			for (sect = s_first; sect<=s_last; sect++) {
				if (info->protect[sect] == 0) {	/* not protected */
					addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
					printf("Erasing sector %p\n", addr2);

					if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
						addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
						addr2[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
						for (i=0; i<50; i++)
							udelay(1000);  /* wait 1 ms */
					} else {
						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
						addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
						addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
					}
					l_sect = sect;
					/*
					 * Wait for each sector to complete, it's more
					 * reliable.  According to AMD Spec, you must
					 * issue all erase commands within a specified
					 * timeout.  This has been seen to fail, especially
					 * if printf()s are included (for debug)!!
					 */
					wait_for_DQ7(info, sect);
				}
			}

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

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

#if 0
			/*
			 * We wait for the last triggered sector
			 */
			if (l_sect < 0)
				goto DONE;
			wait_for_DQ7(info, l_sect);

		DONE:
#endif
			/* reset to read mode */
			addr = (FLASH_WORD_SIZE *)info->start[0];
			addr[0] = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */

			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)
		{
			volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) (info->start[0]);
			volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
			volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
			ulong start;
			int i;

			/* Check if Flash is (sufficiently) erased */
			if ((*((volatile FLASH_WORD_SIZE *) dest) &
			     (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
				return (2);
			}

			for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
				int flag;

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

				addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
				addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
				addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;

				dest2[i] = data2[i];

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

				/* data polling for D7 */
				start = get_timer (0);
				while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
				       (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {

					if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
						return (1);
					}
				}
			}

			return (0);
		}

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