1 files changed, 71 insertions, 0 deletions
diff --git a/src/drivers/spi/spiconsole.c b/src/drivers/spi/spiconsole.c
new file mode 100644
index 0000000000..39a574c3ca
--- /dev/null
+++ b/src/drivers/spi/spiconsole.c
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#include <spi-generic.h>
+#include <spi_flash.h>
+#include <console/spi.h>
+
+void spiconsole_init(void) {
+	spi_init();
+	return;
+}
+
+/*
+ * The EM100 'hyper terminal' specification defines a header of 9 characters.
+ * Because of this, devices with a spi_crop_chunk of less than 10 characters
+ * can't be supported by this standard.
+ *
+ * To add support in romstage, the static struct here and the ones used by
+ * spi_xfer will need to be modified - removed, or mapped into cbmem.
+ *
+ * Because the Dediprog software expects strings, not single characters, and
+ * because of the header overhead, this builds up a buffer to send.
+ */
+void spiconsole_tx_byte(unsigned char c) {
+	static struct em100_msg msg = {
+		.header.spi_command = EM100_DEDICATED_CMD,
+		.header.em100_command = EM100_UFIFO_CMD,
+		.header.msg_signature = EM100_MSG_SIGNATURE,
+		.header.msg_type = EM100_MSG_ASCII,
+		.header.msg_length = 0
+	};
+
+	/* Verify the spi buffer is big enough to send even a single byte */
+	if (spi_crop_chunk(0,MAX_MSG_LENGTH) <
+			sizeof(struct em100_msg_header) + 1)
+		return;
+
+	msg.data[msg.header.msg_length] = c;
+	msg.header.msg_length++;
+
+	/* Send the data on newline or when the max spi length is reached */
+	if (c == '\n' || (sizeof(struct em100_msg_header) +
+			msg.header.msg_length == spi_crop_chunk(0,
+			MAX_MSG_LENGTH))) {
+		struct spi_slave spi = {.rw = SPI_READ_FLAG};
+
+		spi_xfer(&spi, &msg, sizeof(struct em100_msg_header) +
+				msg.header.msg_length, NULL, 0);
+
+		msg.header.msg_length = 0;
+	}
+
+	return;
+}
+