mb/google/kukui: revise per-device memory mapping table

In order to help identifying right DRAM info (especially in user space),
we want to unify the mapping table and do the device-specific mapping by
a virtual offset based on build config.

BUG=b:161768221,b:159301679
BRANCH=kukui
TEST=emerge-jacuzzi coreboot

Change-Id: If89bf18c48d263deb79df3e7a60c33bec000d8a3
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43987
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

4 files changed, 49 insertions, 39 deletions

diff --git a/src/mainboard/google/kukui/Kconfig b/src/mainboard/google/kukui/Kconfig
index e06e60fd39..01247cace6 100644
--- a/src/mainboard/google/kukui/Kconfig
+++ b/src/mainboard/google/kukui/Kconfig
@@ -71,4 +71,9 @@ config EC_GOOGLE_CHROMEEC_SPI_BUS
 	hex
 	default 0x2
 
+config BOARD_SDRAM_TABLE_OFFSET
+	hex
+	default 0x10 if BOARD_GOOGLE_BURNET || BOARD_GOOGLE_ESCHE
+	default 0x0
+
 endif
diff --git a/src/mainboard/google/kukui/boardid.c b/src/mainboard/google/kukui/boardid.c
index c6865d1a67..548f36bc9d 100644
--- a/src/mainboard/google/kukui/boardid.c
+++ b/src/mainboard/google/kukui/boardid.c
@@ -110,7 +110,10 @@ uint32_t ram_code(void)
 {
 	static uint32_t cached_ram_code = BOARD_ID_INIT;
 
-	if (cached_ram_code == BOARD_ID_INIT)
+	if (cached_ram_code == BOARD_ID_INIT) {
 		cached_ram_code = get_adc_index(RAM_ID_CHANNEL);
+		/* Model-specific offset - see sdram_configs.c for details. */
+		cached_ram_code += CONFIG_BOARD_SDRAM_TABLE_OFFSET;
+	}
 	return cached_ram_code;
 }
diff --git a/src/mainboard/google/kukui/sdram_configs.c b/src/mainboard/google/kukui/sdram_configs.c
index 5bf657115e..95306c7b13 100644
--- a/src/mainboard/google/kukui/sdram_configs.c
+++ b/src/mainboard/google/kukui/sdram_configs.c
@@ -5,24 +5,29 @@
 #include <console/console.h>
 #include <soc/emi.h>
 
+/*
+ * The RAM_CODE ADC on Kukui can support only 12 different levels. Each model
+ * can create its own mapping if needed, with an offset (0x10, 0x20, ...,
+ * defined as CONFIG_BOARD_SDRAM_TABLE_OFFSET) applied in ram_code().
+ */
 static const char *const sdram_configs[] = {
-#if CONFIG(BOARD_GOOGLE_BURNET)
-	[1] = "sdram-lpddr4x-H9HCNNNCPMALHR-4GB",
-	[2] = "sdram-lpddr4x-MT53E1G32D4NQ-4GB",
-	[3] = "sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB",
-	[4] = "sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB",
-#else /* The default unified table */
-	[1] = "sdram-lpddr4x-H9HCNNNCPMALHR-4GB",
-	[2] = "sdram-lpddr4x-MT53E1G32D4NQ-4GB",
-	[3] = "sdram-lpddr4x-KMDH6001DA-B422-4GB",
-	[4] = "sdram-lpddr4x-KMDP6001DA-B425-4GB",
-	[5] = "sdram-lpddr4x-MT29VZZZAD8DQKSL-4GB",
-	[6] = "sdram-lpddr4x-KMDV6001DA-B620-4GB",
-	[7] = "sdram-lpddr4x-SDADA4CR-128G-4GB",
-	[8] = "sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB",
-	[9] = "sdram-lpddr4x-MT53E2G32D4NQ-046-8GB",
-	[10] = "sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB",
-#endif
+	/* Standard table. */
+	[0x01] = "sdram-lpddr4x-H9HCNNNCPMALHR-4GB",
+	[0x02] = "sdram-lpddr4x-MT53E1G32D4NQ-4GB",
+	[0x03] = "sdram-lpddr4x-KMDH6001DA-B422-4GB",
+	[0x04] = "sdram-lpddr4x-KMDP6001DA-B425-4GB",
+	[0x05] = "sdram-lpddr4x-MT29VZZZAD8DQKSL-4GB",
+	[0x06] = "sdram-lpddr4x-KMDV6001DA-B620-4GB",
+	[0x07] = "sdram-lpddr4x-SDADA4CR-128G-4GB",
+	[0x08] = "sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB",
+	[0x09] = "sdram-lpddr4x-MT53E2G32D4NQ-046-8GB",
+	[0x0a] = "sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB",
+
+	/* Table shared by Burnet and its variants, offset = 0x10 */
+	[0x11] = "sdram-lpddr4x-H9HCNNNCPMALHR-4GB",
+	[0x12] = "sdram-lpddr4x-MT53E1G32D4NQ-4GB",
+	[0x13] = "sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB",
+	[0x14] = "sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB",
 };
 
 static struct sdram_params params;
@@ -30,11 +35,15 @@ static struct sdram_params params;
 const struct sdram_params *get_sdram_config(void)
 {
 	uint32_t ramcode = ram_code();
+	const char *name = NULL;
+
+	if (ramcode < ARRAY_SIZE(sdram_configs))
+		name = sdram_configs[ramcode];
 
-	if (ramcode >= ARRAY_SIZE(sdram_configs) ||
-	    cbfs_boot_load_file(sdram_configs[ramcode], &params, sizeof(params),
-				CBFS_TYPE_STRUCT) != sizeof(params))
-		die("Cannot load SDRAM parameter file!");
+	if (!name || cbfs_boot_load_file(name, &params, sizeof(params),
+					 CBFS_TYPE_STRUCT) != sizeof(params))
+		die("Cannot load SDRAM parameter file for RAM code %#02x: %s!",
+		    ramcode, name ? name : "unknown");
 
 	return &params;
 }
diff --git a/src/mainboard/google/kukui/sdram_params/Makefile.inc b/src/mainboard/google/kukui/sdram_params/Makefile.inc
index e8dc639bec..12019a2d8e 100644
--- a/src/mainboard/google/kukui/sdram_params/Makefile.inc
+++ b/src/mainboard/google/kukui/sdram_params/Makefile.inc
@@ -1,21 +1,14 @@
 sdram-params :=
-ifeq ($(CONFIG_BOARD_GOOGLE_BURNET),y)
-  sdram-params += sdram-lpddr4x-H9HCNNNCPMALHR-4GB
-  sdram-params += sdram-lpddr4x-MT53E1G32D4NQ-4GB
-  sdram-params += sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB
-  sdram-params += sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB
-else
-  sdram-params += sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB
-  sdram-params += sdram-lpddr4x-H9HCNNNCPMALHR-4GB
-  sdram-params += sdram-lpddr4x-MT53E1G32D4NQ-4GB
-  sdram-params += sdram-lpddr4x-KMDH6001DA-B422-4GB
-  sdram-params += sdram-lpddr4x-KMDP6001DA-B425-4GB
-  sdram-params += sdram-lpddr4x-MT29VZZZAD8DQKSL-4GB
-  sdram-params += sdram-lpddr4x-KMDV6001DA-B620-4GB
-  sdram-params += sdram-lpddr4x-SDADA4CR-128G-4GB
-  sdram-params += sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB
-  sdram-params += sdram-lpddr4x-MT53E2G32D4NQ-046-8GB
-endif
+sdram-params += sdram-lpddr4x-H9HCNNNCPMALHR-4GB
+sdram-params += sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB
+sdram-params += sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB
+sdram-params += sdram-lpddr4x-KMDH6001DA-B422-4GB
+sdram-params += sdram-lpddr4x-KMDP6001DA-B425-4GB
+sdram-params += sdram-lpddr4x-KMDV6001DA-B620-4GB
+sdram-params += sdram-lpddr4x-MT29VZZZAD8DQKSL-4GB
+sdram-params += sdram-lpddr4x-MT53E1G32D4NQ-4GB
+sdram-params += sdram-lpddr4x-MT53E2G32D4NQ-046-8GB
+sdram-params += sdram-lpddr4x-SDADA4CR-128G-4GB
 
 $(foreach params,$(sdram-params), \
 	$(eval cbfs-files-y += $(params)) \