Bloonchipper: USART based transport layer for host command

1. USART host command layer in chip/stm32
2. Fix usart implementation in stm32

BUG=b:147849609
BRANCH=none
TEST=1. make BOARD=bloonchipper -j
     2. usart request and response works on dragonclaw

Change-Id: Idd89d3e490f23aa528ecaf6510c13d16b405de13
Signed-off-by: Bhanu Prakash Maiya <bhanumaiya@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2190531
Tested-by: Bhanu Prakash Maiya <bhanumaiya@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: Tom Hughes <tomhughes@chromium.org>
Reviewed-by: Craig Hesling <hesling@chromium.org>
Commit-Queue: Bhanu Prakash Maiya <bhanumaiya@chromium.org>
Auto-Submit: Bhanu Prakash Maiya <bhanumaiya@chromium.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/chip/stm32/host_command_common.c b/chip/stm32/host_command_common.c
new file mode 100644
index 0000000000..f1d5a0f103
--- /dev/null
+++ b/chip/stm32/host_command_common.c
@@ -0,0 +1,56 @@
+/* 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.
+ */
+
+#include "common.h"
+#include "fpsensor_detect.h"
+#include "host_command.h"
+#include "spi.h"
+#include "usart_host_command.h"
+
+#ifndef CONFIG_I2C_SLAVE
+
+/* Store current transport type */
+static enum fp_transport_type curr_transport_type = FP_TRANSPORT_TYPE_UNKNOWN;
+
+/*
+ * Get protocol information
+ */
+static enum ec_status host_command_protocol_info(struct host_cmd_handler_args
+						 *args)
+{
+	enum ec_status ret_status = EC_RES_INVALID_COMMAND;
+
+	/*
+	 * If FP sensor task is enabled, read transport type from TRANSPORT_SEL
+	 * bootstrap pin for the first time this function is called.
+	 */
+	if ((IS_ENABLED(HAS_TASK_FPSENSOR)) &&
+	    (curr_transport_type == FP_TRANSPORT_TYPE_UNKNOWN)) {
+		curr_transport_type = get_fp_transport_type();
+	}
+
+	/*
+	 * Transport select is only enabled on boards with fp sensor tasks.
+	 * If fp sensor task is enabled, transport is USART and
+	 * host command layer is present, call usart_get_protocol.
+	 * If fp sensor task is enabled and transport is SPI or else if only
+	 * spi layer is enabled on non fp boards, call spi_get_protocol_info.
+	 */
+	if (IS_ENABLED(HAS_TASK_FPSENSOR) &&
+	    IS_ENABLED(CONFIG_USART_HOST_COMMAND) &&
+	    curr_transport_type == FP_TRANSPORT_TYPE_UART)
+		ret_status = usart_get_protocol_info(args);
+	else if (IS_ENABLED(CONFIG_SPI) ||
+		(IS_ENABLED(HAS_TASK_FPSENSOR) &&
+		 curr_transport_type == FP_TRANSPORT_TYPE_SPI))
+			ret_status = spi_get_protocol_info(args);
+
+	return ret_status;
+}
+DECLARE_HOST_COMMAND(EC_CMD_GET_PROTOCOL_INFO,
+		     host_command_protocol_info,
+		     EC_VER_MASK(0));
+
+#endif /* CONFIG_I2C_SLAVE */