44x_spd_ddr.c

uboot详细解读可用启动引导LINUX2.6内核

		{0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
		 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF},
		{0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
		 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000},
		{0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
		 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555},
		{0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
		 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA},
		{0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
		 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A},
		{0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
		 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5},
		{0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
		 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA},
		{0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
		 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55}};

	for (bxcr_num = 0; bxcr_num < MAXBXCR; bxcr_num++) {
		mtdcr(memcfga, mem_b0cr + (bxcr_num << 2));
		if ((mfdcr(memcfgd) & SDRAM_BXCR_SDBE) == SDRAM_BXCR_SDBE) {
			/* Bank is enabled */
			membase = (unsigned long*)
				(mfdcr(memcfgd) & SDRAM_BXCR_SDBA_MASK);

			/*
			 * Run the short memory test
			 */
			for (i = 0; i < NUMMEMTESTS; i++) {
				for (j = 0; j < NUMMEMWORDS; j++) {
					/* printf("bank enabled base:%x\n", &membase[j]); */
					membase[j] = test[i][j];
					ppcDcbf((unsigned long)&(membase[j]));
				}

				for (j = 0; j < NUMMEMWORDS; j++) {
					if (membase[j] != test[i][j]) {
						ppcDcbf((unsigned long)&(membase[j]));
						return 0;
					}
					ppcDcbf((unsigned long)&(membase[j]));
				}

				if (j < NUMMEMWORDS)
					return 0;
			}

			/*
			 * see if the rdclt value passed
			 */
			if (i < NUMMEMTESTS)
				return 0;
		}
	}

	return 1;
}

static void program_tr1(void)
{
	unsigned long tr0;
	unsigned long tr1;
	unsigned long cfg0;
	unsigned long ecc_temp;
	unsigned long dlycal;
	unsigned long dly_val;
	unsigned long k;
	unsigned long max_pass_length;
	unsigned long current_pass_length;
	unsigned long current_fail_length;
	unsigned long current_start;
	unsigned long rdclt;
	unsigned long rdclt_offset;
	long max_start;
	long max_end;
	long rdclt_average;
	unsigned char window_found;
	unsigned char fail_found;
	unsigned char pass_found;
	PPC4xx_SYS_INFO sys_info;

	/*
	 * get the board info
	 */
	get_sys_info(&sys_info);

	/*
	 * get SDRAM Timing Register 0 (SDRAM_TR0) and clear bits
	 */
	mfsdram(mem_tr1, tr1);
	tr1 &= ~(SDRAM_TR1_RDSS_MASK | SDRAM_TR1_RDSL_MASK |
		 SDRAM_TR1_RDCD_MASK | SDRAM_TR1_RDCT_MASK);

	mfsdram(mem_tr0, tr0);
	if (((tr0 & SDRAM_TR0_SDCL_MASK) == SDRAM_TR0_SDCL_2_5_CLK) &&
	    (sys_info.freqPLB > 100000000)) {
		tr1 |= SDRAM_TR1_RDSS_TR2;
		tr1 |= SDRAM_TR1_RDSL_STAGE3;
		tr1 |= SDRAM_TR1_RDCD_RCD_1_2;
	} else {
		tr1 |= SDRAM_TR1_RDSS_TR1;
		tr1 |= SDRAM_TR1_RDSL_STAGE2;
		tr1 |= SDRAM_TR1_RDCD_RCD_0_0;
	}

	/*
	 * save CFG0 ECC setting to a temporary variable and turn ECC off
	 */
	mfsdram(mem_cfg0, cfg0);
	ecc_temp = cfg0 & SDRAM_CFG0_MCHK_MASK;
	mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) | SDRAM_CFG0_MCHK_NON);

	/*
	 * get the delay line calibration register value
	 */
	mfsdram(mem_dlycal, dlycal);
	dly_val = SDRAM_DLYCAL_DLCV_DECODE(dlycal) << 2;

	max_pass_length = 0;
	max_start = 0;
	max_end = 0;
	current_pass_length = 0;
	current_fail_length = 0;
	current_start = 0;
	rdclt_offset = 0;
	window_found = FALSE;
	fail_found = FALSE;
	pass_found = FALSE;
	debug("Starting memory test ");

	for (k = 0; k < NUMHALFCYCLES; k++) {
		for (rdclt = 0; rdclt < dly_val; rdclt++) {
			/*
			 * Set the timing reg for the test.
			 */
			mtsdram(mem_tr1, (tr1 | SDRAM_TR1_RDCT_ENCODE(rdclt)));

			if (short_mem_test()) {
				if (fail_found == TRUE) {
					pass_found = TRUE;
					if (current_pass_length == 0) {
						current_start = rdclt_offset + rdclt;
					}

					current_fail_length = 0;
					current_pass_length++;

					if (current_pass_length > max_pass_length) {
						max_pass_length = current_pass_length;
						max_start = current_start;
						max_end = rdclt_offset + rdclt;
					}
				}
			} else {
				current_pass_length = 0;
				current_fail_length++;

				if (current_fail_length >= (dly_val>>2)) {
					if (fail_found == FALSE) {
						fail_found = TRUE;
					} else if (pass_found == TRUE) {
						window_found = TRUE;
						break;
					}
				}
			}
		}
		debug(".");

		if (window_found == TRUE) {
			break;
		}

		tr1 = tr1 ^ SDRAM_TR1_RDCD_MASK;
		rdclt_offset += dly_val;
	}
	debug("\n");

	/*
	 * make sure we find the window
	 */
	if (window_found == FALSE) {
		printf("ERROR: Cannot determine a common read delay.\n");
		spd_ddr_init_hang ();
	}

	/*
	 * restore the orignal ECC setting
	 */
	mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) | ecc_temp);

	/*
	 * set the SDRAM TR1 RDCD value
	 */
	tr1 &= ~SDRAM_TR1_RDCD_MASK;
	if ((tr0 & SDRAM_TR0_SDCL_MASK) == SDRAM_TR0_SDCL_2_5_CLK) {
		tr1 |= SDRAM_TR1_RDCD_RCD_1_2;
	} else {
		tr1 |= SDRAM_TR1_RDCD_RCD_0_0;
	}

	/*
	 * set the SDRAM TR1 RDCLT value
	 */
	tr1 &= ~SDRAM_TR1_RDCT_MASK;
	while (max_end >= (dly_val << 1)) {
		max_end -= (dly_val << 1);
		max_start -= (dly_val << 1);
	}

	rdclt_average = ((max_start + max_end) >> 1);

	if (rdclt_average < 0) {
		rdclt_average = 0;
	}

	if (rdclt_average >= dly_val) {
		rdclt_average -= dly_val;
		tr1 = tr1 ^ SDRAM_TR1_RDCD_MASK;
	}
	tr1 |= SDRAM_TR1_RDCT_ENCODE(rdclt_average);

	debug("tr1: %x\n", tr1);

	/*
	 * program SDRAM Timing Register 1 TR1
	 */
	mtsdram(mem_tr1, tr1);
}

static unsigned long program_bxcr(unsigned long *dimm_populated,
				  unsigned char *iic0_dimm_addr,
				  unsigned long num_dimm_banks)
{
	unsigned long dimm_num;
	unsigned long bank_base_addr;
	unsigned long cr;
	unsigned long i;
	unsigned long j;
	unsigned long temp;
	unsigned char num_row_addr;
	unsigned char num_col_addr;
	unsigned char num_banks;
	unsigned char bank_size_id;
	unsigned long ctrl_bank_num[MAXBANKS];
	unsigned long bx_cr_num;
	unsigned long largest_size_index;
	unsigned long largest_size;
	unsigned long current_size_index;
	BANKPARMS bank_parms[MAXBXCR];
	unsigned long sorted_bank_num[MAXBXCR]; /* DDR Controller bank number table (sorted by size) */
	unsigned long sorted_bank_size[MAXBXCR]; /* DDR Controller bank size table (sorted by size)*/

	/*
	 * Set the BxCR regs.  First, wipe out the bank config registers.
	 */
	for (bx_cr_num = 0; bx_cr_num < MAXBXCR; bx_cr_num++) {
		mtdcr(memcfga, mem_b0cr + (bx_cr_num << 2));
		mtdcr(memcfgd, 0x00000000);
		bank_parms[bx_cr_num].bank_size_bytes = 0;
	}

#ifdef CONFIG_BAMBOO
	/*
	 * This next section is hardware dependent and must be programmed
	 * to match the hardware.  For bamboo, the following holds...
	 * 1. SDRAM0_B0CR: Bank 0 of dimm 0 ctrl_bank_num : 0 (soldered onboard)
	 * 2. SDRAM0_B1CR: Bank 0 of dimm 1 ctrl_bank_num : 1
	 * 3. SDRAM0_B2CR: Bank 1 of dimm 1 ctrl_bank_num : 1
	 * 4. SDRAM0_B3CR: Bank 0 of dimm 2 ctrl_bank_num : 3
	 * ctrl_bank_num corresponds to the first usable DDR controller bank number by DIMM
	 */
	ctrl_bank_num[0] = 0;
	ctrl_bank_num[1] = 1;
	ctrl_bank_num[2] = 3;
#else
	/*
	 * Ocotea, Ebony and the other IBM/AMCC eval boards have
	 * 2 DIMM slots with each max 2 banks
	 */
	ctrl_bank_num[0] = 0;
	ctrl_bank_num[1] = 2;
#endif

	/*
	 * reset the bank_base address
	 */
	bank_base_addr = CFG_SDRAM_BASE;

	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
		if (dimm_populated[dimm_num] == TRUE) {
			num_row_addr = spd_read(iic0_dimm_addr[dimm_num], 3);
			num_col_addr = spd_read(iic0_dimm_addr[dimm_num], 4);
			num_banks    = spd_read(iic0_dimm_addr[dimm_num], 5);
			bank_size_id = spd_read(iic0_dimm_addr[dimm_num], 31);
			debug("DIMM%d: row=%d col=%d banks=%d\n", dimm_num,
			      num_row_addr, num_col_addr, num_banks);

			/*
			 * Set the SDRAM0_BxCR regs
			 */
			cr = 0;
			switch (bank_size_id) {
			case 0x02:
				cr |= SDRAM_BXCR_SDSZ_8;
				break;
			case 0x04:
				cr |= SDRAM_BXCR_SDSZ_16;
				break;
			case 0x08:
				cr |= SDRAM_BXCR_SDSZ_32;
				break;
			case 0x10:
				cr |= SDRAM_BXCR_SDSZ_64;
				break;
			case 0x20:
				cr |= SDRAM_BXCR_SDSZ_128;
				break;
			case 0x40:
				cr |= SDRAM_BXCR_SDSZ_256;
				break;
			case 0x80:
				cr |= SDRAM_BXCR_SDSZ_512;
				break;
			default:
				printf("DDR-SDRAM: DIMM %lu BxCR configuration.\n",
				       dimm_num);
				printf("ERROR: Unsupported value for the banksize: %d.\n",
				       bank_size_id);
				printf("Replace the DIMM module with a supported DIMM.\n\n");
				spd_ddr_init_hang ();
			}

			switch (num_col_addr) {
			case 0x08:
				cr |= SDRAM_BXCR_SDAM_1;
				break;
			case 0x09:
				cr |= SDRAM_BXCR_SDAM_2;
				break;
			case 0x0A:
				cr |= SDRAM_BXCR_SDAM_3;
				break;
			case 0x0B:
				cr |= SDRAM_BXCR_SDAM_4;
				break;
			default:
				printf("DDR-SDRAM: DIMM %lu BxCR configuration.\n",
				       dimm_num);
				printf("ERROR: Unsupported value for number of "
				       "column addresses: %d.\n", num_col_addr);
				printf("Replace the DIMM module with a supported DIMM.\n\n");
				spd_ddr_init_hang ();
			}

			/*
			 * enable the bank
			 */
			cr |= SDRAM_BXCR_SDBE;

			for (i = 0; i < num_banks; i++) {
				bank_parms[ctrl_bank_num[dimm_num]+i].bank_size_bytes =
					(4 << 20) * bank_size_id;
				bank_parms[ctrl_bank_num[dimm_num]+i].cr = cr;
				debug("DIMM%d-bank %d (SDRAM0_B%dCR): bank_size_bytes=%d\n",
				      dimm_num, i, ctrl_bank_num[dimm_num]+i,
				      bank_parms[ctrl_bank_num[dimm_num]+i].bank_size_bytes);
			}
		}
	}

	/* Initialize sort tables */
	for (i = 0; i < MAXBXCR; i++) {
		sorted_bank_num[i] = i;
		sorted_bank_size[i] = bank_parms[i].bank_size_bytes;
	}

	for (i = 0; i < MAXBXCR-1; i++) {
		largest_size = sorted_bank_size[i];
		largest_size_index = 255;

		/* Find the largest remaining value */
		for (j = i + 1; j < MAXBXCR; j++) {
			if (sorted_bank_size[j] > largest_size) {
				/* Save largest remaining value and its index */
				largest_size = sorted_bank_size[j];
				largest_size_index = j;
			}
		}

		if (largest_size_index != 255) {
			/* Swap the current and largest values */
			current_size_index = sorted_bank_num[largest_size_index];
			sorted_bank_size[largest_size_index] = sorted_bank_size[i];
			sorted_bank_size[i] = largest_size;
			sorted_bank_num[largest_size_index] = sorted_bank_num[i];
			sorted_bank_num[i] = current_size_index;
		}
	}

	/* Set the SDRAM0_BxCR regs thanks to sort tables */
	for (bx_cr_num = 0, bank_base_addr = 0; bx_cr_num < MAXBXCR; bx_cr_num++) {
		if (bank_parms[sorted_bank_num[bx_cr_num]].bank_size_bytes) {
			mtdcr(memcfga, mem_b0cr + (sorted_bank_num[bx_cr_num] << 2));
			temp = mfdcr(memcfgd) & ~(SDRAM_BXCR_SDBA_MASK | SDRAM_BXCR_SDSZ_MASK |
						  SDRAM_BXCR_SDAM_MASK | SDRAM_BXCR_SDBE);
			temp = temp | (bank_base_addr & SDRAM_BXCR_SDBA_MASK) |
				bank_parms[sorted_bank_num[bx_cr_num]].cr;
			mtdcr(memcfgd, temp);
			bank_base_addr += bank_parms[sorted_bank_num[bx_cr_num]].bank_size_bytes;
			debug("SDRAM0_B%dCR=0x%08lx\n", sorted_bank_num[bx_cr_num], temp);
		}
	}

	return(bank_base_addr);
}
#endif /* CONFIG_SPD_EEPROM */