QEMU debugcon: Move under drivers/emulation/qemu

Also prepare this console for use in romstage.

Change-Id: I26a4d4b5db1e44a261396a21bb0f0574d72aa86d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5136
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>

src/console/qemu_debugcon_console.c

@@ -19,43 +19,19 @@
  */
 
 #include <console/console.h>
-#include <arch/io.h>
+#include <console/qemu_debugcon.h>
-
-static unsigned char readback;
 
 static void debugcon_init(void)
 {
-	readback = inb(CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
+	qemu_debugcon_init();
-	printk(BIOS_INFO, "QEMU debugcon %s [port 0x%x]\n",
-	       (readback == 0xe9) ? "detected" : "not found",
-	       CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
 }
 
 static void debugcon_tx_byte(unsigned char data)
 {
-	if (readback == 0xe9) {
+	qemu_debugcon_tx_byte(data);
-		outb(data, CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
-	}
-}
-
-static void debugcon_tx_flush(void)
-{
-}
-
-static unsigned char debugcon_rx_byte(void)
-{
-	return 0;
-}
-
-static int debugcon_tst_byte(void)
-{
-	return 0;
 }
 
 static const struct console_driver debugcon_console __console = {
 	.init = debugcon_init,
 	.tx_byte = debugcon_tx_byte,
-	.tx_flush = debugcon_tx_flush,
-	.rx_byte = debugcon_rx_byte,
-	.tst_byte = debugcon_tst_byte,
 };

src/drivers/emulation/qemu/Makefile.inc

@@ -1,3 +1,6 @@
+romstage-$(CONFIG_CONSOLE_QEMU_DEBUGCON) += qemu_debugcon.c
+ramstage-$(CONFIG_CONSOLE_QEMU_DEBUGCON) += qemu_debugcon.c
+
 ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += bochs.c
 ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += cirrus.c
 ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += ../../pc80/vga/vga_io.c

src/drivers/emulation/qemu/qemu_debugcon.c

@@ -0,0 +1,41 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Red Hat Inc.
+ * Written by Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * 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 <console/console.h>
+#include <console/qemu_debugcon.h>
+#include <arch/io.h>
+#include <arch/early_variables.h>
+
+static int qemu_debugcon_detected CAR_GLOBAL;
+
+void qemu_debugcon_init(void)
+{
+	int detected = (inb(CONFIG_CONSOLE_QEMU_DEBUGCON_PORT) == 0xe9);
+	car_set_var(qemu_debugcon_detected, detected);
+	printk(BIOS_INFO, "QEMU debugcon %s [port 0x%x]\n",
+	       detected ? "detected" : "not found",
+	       CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
+}
+
+void qemu_debugcon_tx_byte(unsigned char data)
+{
+	if (car_get_var(qemu_debugcon_detected) != 0)
+		outb(data, CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
+}

src/include/console/qemu_debugcon.h

@@ -0,0 +1,7 @@
+#ifndef _QEMU_DEBUGCON_H_
+#define _QEMU_DEBUGCON_H_
+
+void qemu_debugcon_init(void);
+void qemu_debugcon_tx_byte(unsigned char data);
+
+#endif