lib: Add library to handle SPD data in CBFS or DIMM

Add library to:
1. add spd.bin in cbfs, generated from mainboard/spd/*.spd.hex files.
2. runtime get spd data with spd index as input.
3. fetch spd over smbus using early smbus functions.

Change-Id: I44fe1cdb883dd1037484d4bb5c87d2d4f9862bf8
Signed-off-by: Naresh G Solanki <naresh.solanki@intel.com>
Reviewed-on: https://review.coreboot.org/17434
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/include/spd_bin.h

@@ -0,0 +1,57 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corporation.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef SPD_BIN_H
+#define SPD_BIN_H
+
+#include <arch/early_variables.h>
+#include <stdint.h>
+#include <commonlib/region.h>
+
+#define SPD_PAGE_LEN		256
+#define SPD_PAGE_LEN_DDR4	512
+#define SPD_PAGE_0		(0x6C >> 1)
+#define SPD_PAGE_1		(0x6E >> 1)
+#define SPD_DRAM_TYPE		2
+#define  SPD_DRAM_DDR3		0x0B
+#define  SPD_DRAM_LPDDR3_INTEL	0xF1
+#define  SPD_DRAM_LPDDR3_JEDEC	0x0F
+#define  SPD_DRAM_DDR4		0x0C
+#define SPD_DENSITY_BANKS	4
+#define SPD_ADDRESSING		5
+#define SPD_ORGANIZATION	7
+#define SPD_BUS_DEV_WIDTH	8
+#define DDR3_SPD_PART_OFF	128
+#define DDR3_SPD_PART_LEN	18
+#define LPDDR3_SPD_PART_OFF	128
+#define LPDDR3_SPD_PART_LEN	18
+#define DDR4_SPD_PART_OFF	329
+#define DDR4_SPD_PART_LEN	20
+#define LPDDR4_SPD_PART_OFF	329
+#define LPDDR4_SPD_PART_LEN	20
+
+struct spd_block {
+	u8 *spd_array[CONFIG_DIMM_MAX];
+	/* Length of each dimm */
+	u16 len;
+};
+
+void print_spd_info(uint8_t spd[]);
+/* Return 0 on success & -1 on failure */
+int get_spd_cbfs_rdev(struct region_device *spd_rdev, u8 spd_index);
+void dump_spd_info(struct spd_block *blk);
+void get_spd_smbus(struct spd_block *blk);
+
+#endif