usbdebug: Split to USB host/device

Top-level interface to console over USB mut not require low-level
details of ECHI debug port internals.

Change-Id: If3ca3b1f479e3f20976cd4abd8f5e682a58d5650
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5197
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/drivers/usb/console.c b/src/drivers/usb/console.c
new file mode 100644
index 0000000000..c47610a2a3
--- /dev/null
+++ b/src/drivers/usb/console.c
@@ -0,0 +1,64 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2006 Eric Biederman (ebiederm@xmission.com)
+ * Copyright (C) 2007 AMD
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+#include <stddef.h>
+#include <console/console.h>
+#include <console/usb.h>
+#include "ehci_debug.h"
+
+void usbdebug_tx_byte(struct dbgp_pipe *pipe, unsigned char data)
+{
+	if (!dbgp_try_get(pipe))
+		return;
+	pipe->buf[pipe->bufidx++] = data;
+	if (pipe->bufidx >= 8) {
+		dbgp_bulk_write_x(pipe, pipe->buf, pipe->bufidx);
+		pipe->bufidx = 0;
+	}
+	dbgp_put(pipe);
+}
+
+void usbdebug_tx_flush(struct dbgp_pipe *pipe)
+{
+	if (!dbgp_try_get(pipe))
+		return;
+	if (pipe->bufidx > 0) {
+		dbgp_bulk_write_x(pipe, pipe->buf, pipe->bufidx);
+		pipe->bufidx = 0;
+	}
+	dbgp_put(pipe);
+}
+
+unsigned char usbdebug_rx_byte(struct dbgp_pipe *pipe)
+{
+	unsigned char data = 0xff;
+	if (!dbgp_try_get(pipe))
+		return 0xff;
+	while (pipe->bufidx >= pipe->buflen) {
+		pipe->buflen = 0;
+		pipe->bufidx = 0;
+		int count = dbgp_bulk_read_x(pipe, pipe->buf, 8);
+		if (count>0)
+			pipe->buflen = count;
+	}
+	data = pipe->buf[pipe->bufidx++];
+	dbgp_put(pipe);
+	return data;
+}