devices -> drivers

drivers/pl011.c

@@ -0,0 +1,34 @@
+/*
+    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
+
+    This file is part of Aedrix.
+
+    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; either version 2 of the License, or
+    (at your option) any later version.
+
+    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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <types.h>
+
+#define PL011_SERIAL_BASE 0x10009000
+#define PL011_SERIAL_FLAG_REGISTER 0x18
+#define PL011_SERIAL_BUFFER_FULL (1 << 5)
+
+void pl011_putc(char c)
+{
+	/* Wait until the serial buffer is empty */
+	while (*(volatile uint32*)(PL011_SERIAL_BASE + PL011_SERIAL_FLAG_REGISTER) & (PL011_SERIAL_BUFFER_FULL));
+
+	/* When it's empty, put our character at the base */
+	*(volatile uint32*)PL011_SERIAL_BASE = c;
+}