1 files changed, 68 insertions, 0 deletions
diff --git a/board/cr50/ec_comm.c b/board/cr50/ec_comm.c
new file mode 100644
index 0000000000..3e9a343f2c
--- /dev/null
+++ b/board/cr50/ec_comm.c
@@ -0,0 +1,68 @@
+/* Copyright 2020 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * EC-CR50 communication
+ */
+#include "common.h"
+#include "console.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "system.h"
+#include "task.h"
+#include "uartn.h"
+
+#define CPRINTS(format, args...) cprints(CC_TASK, "EC-COMM: " format, ## args)
+
+/*
+ * Context of EC-CR50 communication
+ */
+static struct ec_comm_context_ {
+	uint8_t uart;	/* Current UART ID in packet mode.        */
+			/* UART_NULL if no UART is in packet mode */
+} ec_comm_ctx;
+
+
+/*
+ * Initialize EC-CR50 communication context.
+ */
+static void ec_comm_init_(void)
+{
+	ec_comm_ctx.uart = UART_NULL;
+
+	if (!board_has_ec_cr50_comm_support())
+		return;
+
+	CPRINTS("Initializtion");
+
+	gpio_enable_interrupt(GPIO_EC_PACKET_MODE_EN);
+	gpio_enable_interrupt(GPIO_EC_PACKET_MODE_DIS);
+
+	/* If DIOB3 is already high, then enable the packet mode. */
+	if (gpio_get_level(GPIO_EC_PACKET_MODE_EN))
+		ec_comm_packet_mode_en(GPIO_EC_PACKET_MODE_EN);
+}
+DECLARE_HOOK(HOOK_INIT, ec_comm_init_, HOOK_PRIO_DEFAULT + 1);
+
+void ec_comm_packet_mode_en(enum gpio_signal unsed)
+{
+	disable_sleep(SLEEP_MASK_EC_CR50_COMM);
+
+	/* TODO: Initialize packet context */
+
+	ec_comm_ctx.uart = UART_EC;  /* Enable Packet Mode */
+	ccd_update_state();
+}
+
+void ec_comm_packet_mode_dis(enum gpio_signal unsed)
+{
+	ec_comm_ctx.uart = UART_NULL;	 /* Disable Packet Mode. */
+	ccd_update_state();
+
+	enable_sleep(SLEEP_MASK_EC_CR50_COMM);
+}
+
+int ec_comm_is_uart_in_packet_mode(int uart)
+{
+	return uart == ec_comm_ctx.uart;
+}