XPedite5370 board support

Initial support for Extreme Engineering Solutions XPedite5370 -
a MPC8572-based 3U VPX single board computer with a PMC/XMC
site.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

1 files changed, 270 insertions, 0 deletions

diff --git a/board/xes/xpedite5370/ddr.c b/board/xes/xpedite5370/ddr.c
new file mode 100644
index 0000000..4d3f255
--- /dev/null
+++ b/board/xes/xpedite5370/ddr.c
@@ -0,0 +1,270 @@
+/*
+ * Copyright 2008 Extreme Engineering Solutions, Inc.
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * 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 <common.h>
+#include <i2c.h>
+
+#include <asm/fsl_ddr_sdram.h>
+#include <asm/fsl_ddr_dimm_params.h>
+
+static void get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address)
+{
+	i2c_read(i2c_address, SPD_EEPROM_OFFSET, 2, (uchar *)spd,
+		 sizeof(ddr2_spd_eeprom_t));
+}
+
+unsigned int fsl_ddr_get_mem_data_rate(void)
+{
+	return get_ddr_freq(0);
+}
+
+void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd,
+		      unsigned int ctrl_num)
+{
+	unsigned int i;
+	unsigned int i2c_address = 0;
+
+	for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
+		if (ctrl_num == 0)
+			i2c_address = SPD_EEPROM_ADDRESS1;
+		if (ctrl_num == 1)
+			i2c_address = SPD_EEPROM_ADDRESS2;
+		get_spd(&(ctrl_dimms_spd[i]), i2c_address);
+	}
+}
+
+/*
+ * There are four board-specific SDRAM timing parameters which must be
+ * calculated based on the particular PCB artwork.  These are:
+ *   1.) CPO (Read Capture Delay)
+ *           - TIMING_CFG_2 register
+ *           Source: Calculation based on board trace lengths and
+ *                   chip-specific internal delays.
+ *   2.) WR_DATA_DELAY (Write Command to Data Strobe Delay)
+ *           - TIMING_CFG_2 register
+ *           Source: Calculation based on board trace lengths.
+ *                   Unless clock and DQ lanes are very different
+ *                   lengths (>2"), this should be set to the nominal value
+ *                   of 1/2 clock delay.
+ *   3.) CLK_ADJUST (Clock and Addr/Cmd alignment control)
+ *           - DDR_SDRAM_CLK_CNTL register
+ *           Source: Signal Integrity Simulations
+ *   4.) 2T Timing on Addr/Ctl
+ *           - TIMING_CFG_2 register
+ *           Source: Signal Integrity Simulations
+ *           Usually only needed with heavy load/very high speed (>DDR2-800)
+ *
+ *     ====== XPedite5370 DDR2-600 read delay calculations ======
+ *
+ *     See Freescale's App Note AN2583 as refrence.  This document also
+ *     contains the chip-specific delays for 8548E, 8572, etc.
+ *
+ *     For MPC8572E
+ *     Minimum chip delay (Ch 0): 1.372ns
+ *     Maximum chip delay (Ch 0): 2.914ns
+ *     Minimum chip delay (Ch 1): 1.220ns
+ *     Maximum chip delay (Ch 1): 2.595ns
+ *
+ *     CLK adjust = 5 (from simulations) = 5/8* 3.33ns = 2080ps
+ *
+ *     Minimum delay calc (Ch 0):
+ *     clock prop - dram skew + min dqs prop delay + clk_adjust + min chip dly
+ *     2.3" * 180 - 400ps     + 1.9" * 180         + 2080ps     + 1372ps
+ *                                                 = 3808ps
+ *                                                 = 3.808ns
+ *
+ *     Maximum delay calc (Ch 0):
+ *     clock prop + dram skew + max dqs prop delay + clk_adjust + max chip dly
+ *     2.3" * 180 + 400ps     + 2.4" * 180         + 2080ps     + 2914ps
+ *                                                 = 6240ps
+ *                                                 = 6.240ns
+ *
+ *     Minimum delay calc (Ch 1):
+ *     clock prop - dram skew + min dqs prop delay + clk_adjust + min chip dly
+ *     1.46" * 180- 400ps     + 0.7" * 180         + 2080ps     + 1220ps
+ *                                                 = 3288ps
+ *                                                 = 3.288ns
+ *
+ *     Maximum delay calc (Ch 1):
+ *     clock prop + dram skew + max dqs prop delay + clk_adjust + min chip dly
+ *     1.46" * 180+ 400ps     + 1.1" * 180         + 2080ps     + 2595ps
+ *                                                 = 5536ps
+ *                                                 = 5.536ns
+ *
+ *     Ch.0: 3.808ns to 6.240ns additional delay needed  (pick 5ns as target)
+ *              This is 1.5 clock cycles, pick CPO = READ_LAT + 3/2 (0x8)
+ *     Ch.1: 3.288ns to 5.536ns additional delay needed  (pick 4.4ns as target)
+ *              This is 1.32 clock cycles, pick CPO = READ_LAT + 5/4 (0x7)
+ *
+ *
+ *     ====== XPedite5370 DDR2-800 read delay calculations ======
+ *
+ *     See Freescale's App Note AN2583 as refrence.  This document also
+ *     contains the chip-specific delays for 8548E, 8572, etc.
+ *
+ *     For MPC8572E
+ *     Minimum chip delay (Ch 0): 1.372ns
+ *     Maximum chip delay (Ch 0): 2.914ns
+ *     Minimum chip delay (Ch 1): 1.220ns
+ *     Maximum chip delay (Ch 1): 2.595ns
+ *
+ *     CLK adjust = 5 (from simulations) = 5/8* 2.5ns = 1563ps
+ *
+ *     Minimum delay calc (Ch 0):
+ *     clock prop - dram skew + min dqs prop delay + clk_adjust + min chip dly
+ *     2.3" * 180 - 350ps     + 1.9" * 180         + 1563ps     + 1372ps
+ *                                                 = 3341ps
+ *                                                 = 3.341ns
+ *
+ *     Maximum delay calc (Ch 0):
+ *     clock prop + dram skew + max dqs prop delay + clk_adjust + max chip dly
+ *     2.3" * 180 + 350ps     + 2.4" * 180         + 1563ps     + 2914ps
+ *                                                 = 5673ps
+ *                                                 = 5.673ns
+ *
+ *     Minimum delay calc (Ch 1):
+ *     clock prop - dram skew + min dqs prop delay + clk_adjust + min chip dly
+ *     1.46" * 180- 350ps     + 0.7" * 180         + 1563ps     + 1220ps
+ *                                                 = 2822ps
+ *                                                 = 2.822ns
+ *
+ *     Maximum delay calc (Ch 1):
+ *     clock prop + dram skew + max dqs prop delay + clk_adjust + min chip dly
+ *     1.46" * 180+ 350ps     + 1.1" * 180         + 1563ps     + 2595ps
+ *                                                 = 4968ps
+ *                                                 = 4.968ns
+ *
+ *     Ch.0: 3.341ns to 5.673ns additional delay needed  (pick 4.5ns as target)
+ *              This is 1.8 clock cycles, pick CPO = READ_LAT + 7/4 (0x9)
+ *     Ch.1: 2.822ns to 4.968ns additional delay needed  (pick 3.9ns as target)
+ *              This is 1.56 clock cycles, pick CPO = READ_LAT + 3/2 (0x8)
+ *
+ * Write latency (WR_DATA_DELAY) is calculated by doing the following:
+ *
+ *      The DDR SDRAM specification requires DQS be received no sooner than
+ *      75% of an SDRAM clock period—and no later than 125% of a clock
+ *      period—from the capturing clock edge of the command/address at the
+ *      SDRAM.
+ *
+ * Based on the above tracelengths, the following are calculated:
+ *      Ch. 0 8572 to DRAM propagation (DQ lanes) : 1.9" * 180 =  0.342ns
+ *      Ch. 0 8572 to DRAM propagation (CLKs) :     2.3" * 180 =  0.414ns
+ *      Ch. 1 8572 to DRAM propagation (DQ lanes) : 0.7" * 180 =  0.126ns
+ *      Ch. 1 8572 to DRAM propagation (CLKs   ) : 1.47" * 180 =  0.264ns
+ *
+ * Difference in arrival time CLK vs. DQS:
+ *      Ch. 0 0.072ns
+ *      Ch. 1 0.138ns
+ *
+ *      Both of these values are much less than 25% of the clock
+ *      period at DDR2-600 or DDR2-800, so no additional delay is needed over
+ *      the 1/2 cycle which normally aligns the first DQS transition
+ *      exactly WL (CAS latency minus one cycle) after the CAS strobe.
+ *      See Figure 9-53 in MPC8572E manual: "1/2 delay" in Freescale's
+ *      terminology corresponds to exactly one clock period delay after
+ *      the CAS strobe. (due to the fact that the "delay" is referenced
+ *      from the *falling* edge of the CLK, just after the rising edge
+ *      which the CAS strobe is latched on.
+ */
+
+typedef struct board_memctl_options {
+	uint16_t datarate_mhz_low;
+	uint16_t datarate_mhz_high;
+	uint8_t clk_adjust;
+	uint8_t cpo_override;
+	uint8_t write_data_delay;
+} board_memctl_options_t;
+
+static struct board_memctl_options bopts_ctrl[][2] = {
+	{
+		/* Controller 0 */
+		{
+			/* DDR2 600/667 */
+			.datarate_mhz_low	= 500,
+			.datarate_mhz_high	= 750,
+			.clk_adjust		= 5,
+			.cpo_override		= 8,
+			.write_data_delay	= 2,
+		},
+		{
+			/* DDR2 800 */
+			.datarate_mhz_low	= 750,
+			.datarate_mhz_high	= 850,
+			.clk_adjust		= 5,
+			.cpo_override		= 9,
+			.write_data_delay	= 2,
+		},
+	},
+	{
+		/* Controller 1 */
+		{
+			/* DDR2 600/667 */
+			.datarate_mhz_low	= 500,
+			.datarate_mhz_high	= 750,
+			.clk_adjust		= 5,
+			.cpo_override		= 7,
+			.write_data_delay	= 2,
+		},
+		{
+			/* DDR2 800 */
+			.datarate_mhz_low	= 750,
+			.datarate_mhz_high	= 850,
+			.clk_adjust		= 5,
+			.cpo_override		= 8,
+			.write_data_delay	= 2,
+		},
+	},
+};
+
+void fsl_ddr_board_options(memctl_options_t *popts,
+			   dimm_params_t *pdimm,
+			   unsigned int ctrl_num)
+{
+	struct board_memctl_options *bopts = bopts_ctrl[ctrl_num];
+	sys_info_t sysinfo;
+	int i;
+	unsigned int datarate;
+
+	get_sys_info(&sysinfo);
+	datarate = sysinfo.freqDDRBus / 1000 / 1000;
+
+	for (i = 0; i < ARRAY_SIZE(bopts_ctrl[ctrl_num]); i++) {
+		if ((bopts[i].datarate_mhz_low <= datarate) &&
+		    (bopts[i].datarate_mhz_high >= datarate)) {
+			debug("controller %d:\n", ctrl_num);
+			debug(" clk_adjust = %d\n", bopts[i].clk_adjust);
+			debug(" cpo = %d\n", bopts[i].cpo_override);
+			debug(" write_data_delay = %d\n",
+			      bopts[i].write_data_delay);
+			popts->clk_adjust = bopts[i].clk_adjust;
+			popts->cpo_override = bopts[i].cpo_override;
+			popts->write_data_delay = bopts[i].write_data_delay;
+		}
+	}
+
+	/*
+	 * Factors to consider for half-strength driver enable:
+	 *	- number of DIMMs installed
+	 */
+	popts->half_strength_driver_enable = 0;
+}