1 files changed, 69 insertions, 0 deletions
diff --git a/chip/g/usart.h b/chip/g/usart.h
new file mode 100644
index 0000000000..79616a48e0
--- /dev/null
+++ b/chip/g/usart.h
@@ -0,0 +1,69 @@
+/* Copyright 2016 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 "consumer.h"
+#include "producer.h"
+#include "registers.h"
+#include "task.h"
+
+#ifndef __CROS_FORWARD_UART_H
+#define __CROS_FORWARD_UART_H
+
+struct usart_config {
+	int uart;
+
+	struct producer const producer;
+	struct consumer const consumer;
+};
+
+extern struct consumer_ops const uart_consumer_ops;
+extern struct producer_ops const uart_producer_ops;
+#define CONFIGURE_INTERRUPTS(NAME,					\
+			     RXINT,					\
+			     TXINT)					\
+	void CONCAT2(NAME, _rx_int_)(void);				\
+	void CONCAT2(NAME, _tx_int_)(void);				\
+	DECLARE_IRQ(RXINT, CONCAT2(NAME, _rx_int_), 1);			\
+	DECLARE_IRQ(TXINT, CONCAT2(NAME, _tx_int_), 1);			\
+	void CONCAT2(NAME, _tx_int_)(void)				\
+	{								\
+		/* Clear transmit interrupt status */			\
+		GR_UART_ISTATECLR(NAME.uart) =				\
+			GC_UART_ISTATECLR_TX_MASK;			\
+		/* Fill output FIFO */					\
+		get_data_from_usb(&NAME);				\
+	}								\
+	void CONCAT2(NAME, _rx_int_)(void)				\
+	{								\
+		/* Clear receive interrupt status */			\
+		GR_UART_ISTATECLR(NAME.uart) =				\
+			GC_UART_ISTATECLR_RX_MASK;			\
+		/* Read input FIFO until empty */			\
+		send_data_to_usb(&NAME);				\
+	}
+
+
+#define USART_CONFIG(UART,						\
+		     RX_QUEUE,						\
+		     TX_QUEUE)						\
+	((struct usart_config const) {					\
+		.uart      = UART,					\
+		.consumer  = {						\
+			.queue = &TX_QUEUE,				\
+			.ops   = &uart_consumer_ops,			\
+		},							\
+		.producer  = {						\
+			.queue = &RX_QUEUE,				\
+			.ops   = &uart_producer_ops,			\
+		},							\
+	})
+
+
+/* Read data from UART and add it to the producer queue */
+void send_data_to_usb(struct usart_config const *config);
+
+/* Read data from the consumer queue and send it to the UART */
+void get_data_from_usb(struct usart_config const *config);
+#endif  /* __CROS_FORWARD_UART_H */