mb/google/poppy/variants/nami: Fix Elan touchscreen power off sequence

Power off does not seem to use the ACPI _OFF function, but rather the
smihandler.  Creating variant_smi_sleep function for nami to handle
the power off sequence during reboot/power off.

BUG=b:78311818
BRANCH=None
TEST=Run "poweroff" command from AP console with SMI_DEBUG enabled
     Make sure delays are consistent with spec

Change-Id: Ifeea545fe268be249793b3e508c51f5e4c1a3460
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/26724
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/mainboard/google/poppy/variants/nami/smihandler.c b/src/mainboard/google/poppy/variants/nami/smihandler.c
new file mode 100644
index 000000000000..b29e8ccb56cd
--- /dev/null
+++ b/src/mainboard/google/poppy/variants/nami/smihandler.c
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Google Inc.
+ *
+ * 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 <arch/acpi.h>
+#include <baseboard/variants.h>
+#include <console/console.h>
+#include <delay.h>
+#include "gpio.h"
+
+#define TOUCH_DISABLE         GPP_C3
+#define TOUCH_RESET           GPP_B3
+#define TOUCH_ENABLE          GPP_B4
+
+/*
+ * Elan touchscreen has higher delay requirements than the other
+ * devices, so using that.
+ */
+#define ELAN_STOP_OFF_DELAY   2
+#define ELAN_RESET_OFF_DELAY  2
+#define ELAN_ENABLE_OFF_DELAY 100
+
+void variant_smi_sleep(u8 slp_typ)
+{
+	if (slp_typ == ACPI_S5) {
+		/* TOUCHSCREEN_DIS# */
+		gpio_set(TOUCH_DISABLE, 0);
+		mdelay(ELAN_STOP_OFF_DELAY);
+		/* TOUCHSCREEN_RST# */
+		gpio_set(TOUCH_RESET, 0);
+		mdelay(ELAN_RESET_OFF_DELAY);
+		/* EN_PP3300_DX_TOUCHSCREEN */
+		gpio_set(TOUCH_ENABLE, 0);
+		mdelay(ELAN_ENABLE_OFF_DELAY);
+	}
+}