mb/google/nissa/var/teliks: Support x32 memory configuration

Use GPP_E19 level to determine whether x32 memory configuration is
supported.

BUG=b:409212347
TEST=emerge-nissa coreboot chromeos-bootimage

Change-Id: I152501858069b5164e8ea602373ed27a5288acb1
Signed-off-by: Qinghong Zeng <zengqinghong@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87233
Reviewed-by: Jayvik Desai <jayvik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Weimin Wu <wuweimin@huaqin.corp-partner.google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/mainboard/google/brya/Kconfig

@@ -620,6 +620,7 @@ config BOARD_GOOGLE_TELIKS
 	select DRIVERS_INTEL_MIPI_CAMERA
 	select HAVE_WWAN_POWER_SEQUENCE
 	select SOC_INTEL_TWINLAKE
+	select ENFORCE_MEM_CHANNEL_DISABLE
 
 config BOARD_GOOGLE_TELITH
 	select BOARD_GOOGLE_BASEBOARD_NISSA

src/mainboard/google/brya/variants/teliks/Makefile.mk

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 bootblock-y += gpio.c
 
+romstage-y += memory.c
 romstage-y += gpio.c
 
 ramstage-y += gpio.c

src/mainboard/google/brya/variants/teliks/gpio.c

@@ -74,6 +74,9 @@ static const struct pad_config override_gpio_table[] = {
 	/* R7 : DMIC_DATA_1A ==> NC */
 	PAD_NC_LOCK(GPP_R7, NONE, LOCK_CONFIG),
 
+	/* E19 : DDP1_CTRLDATA ==> GPP_E19_STRAP */
+	PAD_CFG_GPI_LOCK(GPP_E19, DN_20K, LOCK_CONFIG),
+
 	/* Configure the virtual CNVi Bluetooth I2S GPIO pads */
 	/* BT_I2S_BCLK */
 	PAD_CFG_NF(GPP_VGPIO_30, NONE, DEEP, NF3),
@@ -123,6 +126,8 @@ static const struct pad_config early_gpio_table[] = {
 	PAD_CFG_NF(GPP_H10, NONE, DEEP, NF2),
 	/* H11 : UART0_TXD ==> UART_SOC_TX_DBG_RX */
 	PAD_CFG_NF(GPP_H11, NONE, DEEP, NF2),
+	/* E19 : DDP1_CTRLDATA ==> GPP_E19_STRAP */
+	PAD_CFG_GPI_LOCK(GPP_E19, DN_20K, LOCK_CONFIG),
 };
 
 static const struct pad_config romstage_gpio_table[] = {

src/mainboard/google/brya/variants/teliks/memory.c

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <gpio.h>
+#include <soc/romstage.h>
+
+uint8_t mb_get_channel_disable_mask(void)
+{
+	/*
+	 * GPP_E19 High -> One RAM Chip
+	 * GPP_E19 Low  -> Two RAM Chip
+	 */
+	if (gpio_get(GPP_E19)) {
+		/* Disable all other channels except first two on each controller */
+		return (BIT(2) | BIT(3));
+	}
+
+	return 0;
+}