lib/spd_bin: Extend DDR4 spd information

From DDR4 SPD spec:

Byte 4 (0x004): SDRAM Density and Banks
Bits [7, 6]:
00 = 0 (no bank groups)
01 = 1 (2 bank groups)
10 = 2 (4 bank groups)
11 = reserved

Bit [5, 4] :
00 = 2 (4 banks)
01 = 3 (8 banks)
All others reserved

Separate DDR3 and DDR4 banks. And extened capmb, rows, cols and ranks.
Separate DDR3 and DDR4 ORGANIZATION/BUS_DEV_WIDTH offset.

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I5f56975ce73d8ed2d4de7d9fd08e5ae86993e731
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35206
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 120 insertions, 28 deletions

diff --git a/src/lib/spd_bin.c b/src/lib/spd_bin.c
index 1598ff162f..62e600b2c8 100644
--- a/src/lib/spd_bin.c
+++ b/src/lib/spd_bin.c
@@ -33,54 +33,146 @@ void dump_spd_info(struct spd_block *blk)
 		}
 }
 
-void print_spd_info(uint8_t spd[])
+static bool is_memory_type_ddr4(int dram_type)
 {
-	const int spd_banks[8] = { 8, 16, 32, 64, -1, -1, -1, -1 };
-	const int spd_capmb[8] = { 1,  2,  4,  8, 16, 32, 64, 128 };
-	const int spd_rows[8]  = {12, 13, 14, 15, 16, 17, -1, -1 };
-	const int spd_cols[8]  = { 9, 10, 11, 12, -1, -1, -1, -1 };
-	const int spd_ranks[8] = { 1,  2,  3,  4, -1, -1, -1, -1 };
-	const int spd_devw[8]  = { 4,  8, 16, 32, -1, -1, -1, -1 };
-	const int spd_busw[8]  = { 8, 16, 32, 64, -1, -1, -1, -1 };
-	char spd_name[DDR4_SPD_PART_LEN+1] = { 0 };
+	return (dram_type == SPD_DRAM_DDR4);
+}
 
-	int banks = spd_banks[(spd[SPD_DENSITY_BANKS] >> 4) & 7];
-	int capmb = spd_capmb[spd[SPD_DENSITY_BANKS] & 7] * 256;
-	int rows  = spd_rows[(spd[SPD_ADDRESSING] >> 3) & 7];
-	int cols  = spd_cols[spd[SPD_ADDRESSING] & 7];
-	int ranks = spd_ranks[(spd[SPD_ORGANIZATION] >> 3) & 7];
-	int devw  = spd_devw[spd[SPD_ORGANIZATION] & 7];
-	int busw  = spd_busw[spd[SPD_BUS_DEV_WIDTH] & 7];
+static const char *spd_get_module_type_string(int dram_type)
+{
+	switch (dram_type) {
+	case SPD_DRAM_DDR3:
+		return "DDR3";
+	case SPD_DRAM_LPDDR3_INTEL:
+	case SPD_DRAM_LPDDR3_JEDEC:
+		return "LPDDR3";
+	case SPD_DRAM_DDR4:
+		return "DDR4";
+	}
+	return "UNKNOWN";
+}
 
-	/* Module type */
-	printk(BIOS_INFO, "SPD: module type is ");
-	switch (spd[SPD_DRAM_TYPE]) {
+static int spd_get_banks(const uint8_t spd[], int dram_type)
+{
+	static const int ddr3_banks[4] = { 8, 16, 32, 64 };
+	static const int ddr4_banks[10] = { 4, 8, -1, -1, 8, 16, -1, -1, 16, 32 };
+	int index = (spd[SPD_DENSITY_BANKS] >> 4) & 0xf;
+	switch (dram_type) {
+	/* DDR3 and LPDDR3 has the same bank definition */
+	case SPD_DRAM_DDR3:
+	case SPD_DRAM_LPDDR3_INTEL:
+	case SPD_DRAM_LPDDR3_JEDEC:
+		if (index >= ARRAY_SIZE(ddr3_banks))
+			return -1;
+		return ddr3_banks[index];
+	case SPD_DRAM_DDR4:
+		if (index >= ARRAY_SIZE(ddr4_banks))
+			return -1;
+		return ddr4_banks[index];
+	default:
+		return -1;
+	}
+}
+
+static int spd_get_capmb(const uint8_t spd[])
+{
+	static const int spd_capmb[10] = { 1, 2, 4, 8, 16, 32, 64, 128, 48, 96 };
+	int index = spd[SPD_DENSITY_BANKS] & 0xf;
+	if (index >= ARRAY_SIZE(spd_capmb))
+		return -1;
+	return spd_capmb[index] * 256;
+}
+
+static int spd_get_rows(const uint8_t spd[])
+{
+	static const int spd_rows[7]  = { 12, 13, 14, 15, 16, 17, 18 };
+	int index = (spd[SPD_ADDRESSING] >> 3) & 7;
+	if (index >= ARRAY_SIZE(spd_rows))
+		return -1;
+	return spd_rows[index];
+}
+
+static int spd_get_cols(const uint8_t spd[])
+{
+	static const int spd_cols[4]  = { 9, 10, 11, 12 };
+	int index = spd[SPD_ADDRESSING] & 7;
+	if (index >= ARRAY_SIZE(spd_cols))
+		return -1;
+	return spd_cols[index];
+}
+
+static int spd_get_ranks(const uint8_t spd[], int dram_type)
+{
+	static const int spd_ranks[8] = { 1, 2, 3, 4, 5, 6, 7, 8 };
+	int organ_offset = is_memory_type_ddr4(dram_type) ? DDR4_ORGANIZATION
+							: DDR3_ORGANIZATION;
+	int index = (spd[organ_offset] >> 3) & 7;
+	if (index >= ARRAY_SIZE(spd_ranks))
+		return -1;
+	return spd_ranks[index];
+}
+
+static int spd_get_devw(const uint8_t spd[], int dram_type)
+{
+	static const int spd_devw[4]  = { 4, 8, 16, 32 };
+	int organ_offset = is_memory_type_ddr4(dram_type) ? DDR4_ORGANIZATION
+							: DDR3_ORGANIZATION;
+	int index = spd[organ_offset] & 7;
+	if (index >= ARRAY_SIZE(spd_devw))
+		return -1;
+	return spd_devw[index];
+}
+
+static int spd_get_busw(const uint8_t spd[], int dram_type)
+{
+	static const int spd_busw[4]  = { 8, 16, 32, 64 };
+	int busw_offset = is_memory_type_ddr4(dram_type) ? DDR4_BUS_DEV_WIDTH
+							: DDR3_BUS_DEV_WIDTH;
+	int index = spd[busw_offset] & 7;
+	if (index >= ARRAY_SIZE(spd_busw))
+		return -1;
+	return spd_busw[index];
+}
+
+static void spd_get_name(const uint8_t spd[], char spd_name[], int dram_type)
+{
+	switch (dram_type) {
 	case SPD_DRAM_DDR3:
-		printk(BIOS_INFO, "DDR3\n");
-		/* Module Part Number */
 		memcpy(spd_name, &spd[DDR3_SPD_PART_OFF], DDR3_SPD_PART_LEN);
 		spd_name[DDR3_SPD_PART_LEN] = 0;
 		break;
 	case SPD_DRAM_LPDDR3_INTEL:
 	case SPD_DRAM_LPDDR3_JEDEC:
-		printk(BIOS_INFO, "LPDDR3\n");
-		/* Module Part Number */
 		memcpy(spd_name, &spd[LPDDR3_SPD_PART_OFF],
 			LPDDR3_SPD_PART_LEN);
 		spd_name[LPDDR3_SPD_PART_LEN] = 0;
 		break;
 	case SPD_DRAM_DDR4:
-		printk(BIOS_INFO, "DDR4\n");
 		memcpy(spd_name, &spd[DDR4_SPD_PART_OFF], DDR4_SPD_PART_LEN);
 		spd_name[DDR4_SPD_PART_LEN] = 0;
-		ranks = (spd[SPD_ORGANIZATION] >> 3) & 7;
-		devw  = spd_devw[spd[12] & 7];
-		busw  = spd_busw[spd[13] & 7];
 		break;
 	default:
-		printk(BIOS_INFO, "Unknown (%02x)\n", spd[SPD_DRAM_TYPE]);
 		break;
 	}
+}
+
+void print_spd_info(uint8_t spd[])
+{
+	char spd_name[DDR4_SPD_PART_LEN+1] = { 0 };
+	int type  = spd[SPD_DRAM_TYPE];
+	int banks = spd_get_banks(spd, type);
+	int capmb = spd_get_capmb(spd);
+	int rows  = spd_get_rows(spd);
+	int cols  = spd_get_cols(spd);
+	int ranks = spd_get_ranks(spd, type);
+	int devw  = spd_get_devw(spd, type);
+	int busw  = spd_get_busw(spd, type);
+
+	/* Module type */
+	printk(BIOS_INFO, "SPD: module type is %s\n",
+		spd_get_module_type_string(type));
+	/* Module Part Number */
+	spd_get_name(spd, spd_name, type);
 
 	printk(BIOS_INFO, "SPD: module part is %s\n", spd_name);