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-rw-r--r--src/mainboard/google/sarien/Kconfig5
-rw-r--r--src/mainboard/google/sarien/variants/sarien/Makefile.inc2
-rw-r--r--src/mainboard/google/sarien/variants/sarien/ramstage.c73
3 files changed, 79 insertions, 1 deletions
diff --git a/src/mainboard/google/sarien/Kconfig b/src/mainboard/google/sarien/Kconfig
index dc8f486104..4aea9f7470 100644
--- a/src/mainboard/google/sarien/Kconfig
+++ b/src/mainboard/google/sarien/Kconfig
@@ -97,6 +97,11 @@ config DEVICETREE
string
default "variants/$(CONFIG_VARIANT_DIR)/devicetree.cb"
+config TOUCHSCREEN_HID
+ string "Specify the touchscreen HID enabled for the OS"
+ default "WCOM48E2" if BOARD_GOOGLE_ARCADA
+ default "NONE" if BOARD_GOOGLE_SARIEN
+
config VBOOT
select HAS_RECOVERY_MRC_CACHE
select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
diff --git a/src/mainboard/google/sarien/variants/sarien/Makefile.inc b/src/mainboard/google/sarien/variants/sarien/Makefile.inc
index 2bf028eb1f..fa5b2ea36a 100644
--- a/src/mainboard/google/sarien/variants/sarien/Makefile.inc
+++ b/src/mainboard/google/sarien/variants/sarien/Makefile.inc
@@ -14,6 +14,6 @@
##
bootblock-y += gpio.c
-ramstage-y += gpio.c
+ramstage-y += gpio.c ramstage.c
romstage-y += gpio.c
verstage-y += gpio.c
diff --git a/src/mainboard/google/sarien/variants/sarien/ramstage.c b/src/mainboard/google/sarien/variants/sarien/ramstage.c
new file mode 100644
index 0000000000..ab79678f9a
--- /dev/null
+++ b/src/mainboard/google/sarien/variants/sarien/ramstage.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google LLC
+ *
+ * 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.
+ */
+
+#include <bootstate.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <drivers/i2c/hid/chip.h>
+#include <drivers/vpd/vpd.h>
+#include <soc/pci_devs.h>
+#include <string.h>
+
+/*
+ * This board may have different touchscreen devices that are at the
+ * same I2C slave address but need different drivers or ACPI configuration.
+ *
+ * The default touchscreen to be enabled is specified in Kconfig by the
+ * ACPI HID of the device. If a board is connected to a different
+ * touchscreen device it can be enabled in Kconfig or by setting the
+ * VPD key 'touchscreen_hid'.
+ */
+
+#define TOUCHSCREEN_I2C_ADDR 0x10
+#define TOUCHSCREEN_VPD_KEY "touchscreen_hid"
+
+static void disable_unused_touchscreen(void *unused)
+{
+ struct device *i2c0 = PCH_DEV_I2C0;
+ struct bus *i2c_slaves = i2c0->link_list;
+ struct device *slave = i2c_slaves->children;
+ char touchscreen_hid[9] = CONFIG_TOUCHSCREEN_HID;
+ struct drivers_i2c_hid_config *info;
+
+ /* Look for VPD key that indicates which touchscreen is present */
+ if (IS_ENABLED(CONFIG_VPD) &&
+ !vpd_gets(TOUCHSCREEN_VPD_KEY, touchscreen_hid,
+ ARRAY_SIZE(touchscreen_hid), VPD_ANY))
+ printk(BIOS_INFO, "%s: VPD key '%s' not found, default to %s\n",
+ __func__, TOUCHSCREEN_VPD_KEY, touchscreen_hid);
+
+ /* Go through all I2C slave devices on this bus */
+ while (slave) {
+ /* Find all the I2C slaves with the matching address */
+ if (slave->path.type == DEVICE_PATH_I2C &&
+ slave->path.i2c.device == TOUCHSCREEN_I2C_ADDR) {
+ info = slave->chip_info;
+ /* Disable all devices except the matching HID */
+ if (strncmp(info->generic.hid, touchscreen_hid,
+ ARRAY_SIZE(touchscreen_hid))) {
+ printk(BIOS_INFO, "%s: Disable %s\n", __func__,
+ info->generic.hid);
+ slave->enabled = 0;
+ } else {
+ printk(BIOS_INFO, "%s: Enable %s\n", __func__,
+ info->generic.hid);
+ }
+ }
+ slave = slave->sibling;
+ }
+}
+BOOT_STATE_INIT_ENTRY(BS_WRITE_TABLES, BS_ON_ENTRY,
+ disable_unused_touchscreen, NULL);