vf6xx: add I/O mux controller

Add I/O mux controller which is required to mux pins according to
their used function. For all pads, the alternative function 0 is
GPIO. For different pin mux function refer to the reference manual.

lib/vf6xx/Makefile

@@ -34,7 +34,7 @@ CFLAGS		= -Os -g \
 		  -mcpu=cortex-m4 -mthumb $(FP_FLAGS) -Wstrict-prototypes \
 		  -ffunction-sections -fdata-sections -MD -DVF6XX
 ARFLAGS		= rcs
-OBJS		= ccm.o uart.o gpio.o
+OBJS		= ccm.o uart.o gpio.o iomuxc.o
 
 VPATH += ../cm3
 

lib/vf6xx/iomuxc.c

@@ -0,0 +1,57 @@
+/** @defgroup VF6xx_iomuxc IOMUX-Control
+ *
+ * @ingroup VF6xx
+ *
+ * @section vf6xx_gpio_api_ex GPIO API.
+ *
+ * @brief <b>VF6xx IO Pad MUX Controller</b>
+ *
+ * @author @htmlonly &copy; @endhtmlonly 2014 Stefan Agner <stefan@agner.ch>
+ *
+ * @date 07 July 2014
+ *
+ * This library supports the GPIO module in the VF6xx SoC of Freescale.
+ * Access is provided by GPIO number according to the Pinmux list of the
+ * Reference Manual, similar as GPIOs are available on Linux.
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Stefan Agner <stefan@agner.ch>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**@{*/
+
+#include <libopencm3/vf6xx/iomuxc.h>
+#include <libopencm3/vf6xx/ccm.h>
+
+/*---------------------------------------------------------------------------*/
+/** @brief Set GPIO
+
+Set GPIO by GPIO number according to MUX list
+
+@param[in] gpio unsigned 32 bit. GPIO number
+*/
+
+void iomuxc_mux(enum vf6xx_pad pad, uint32_t muxc)
+{
+	IOMUXC(pad) = muxc;
+}
+
+/**@}*/
+