ips/gpio: add skeleton for GPIO IP

lib/CMakeLists.txt

@@ -10,6 +10,7 @@ set(SOURCES
 	ips/fifo.c
 	ips/dma.c
 	ips/intc.c
+	ips/gpio.c
 	ips/rtds_axis.c
 
 	kernel/kernel.c

lib/ips/gpio.c

+/** GPIO related helper functions
+ *
+ * @author Daniel Krebs <github@daniel-krebs.net>
+ * @copyright 2017, Daniel Krebs
+ * @license GNU General Public License (version 3)
+ *
+ * VILLASfpga
+ *
+ * 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 3 of the License, or
+ * 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, see <http://www.gnu.org/licenses/>.
+ *********************************************************************************/
+
+#include "config.h"
+#include "plugin.h"
+
+#include "fpga/ip.h"
+#include "fpga/card.h"
+
+static int gpio_start(struct fpga_ip *c)
+{
+	(void) c;
+
+	return 0;
+}
+
+static struct plugin p = {
+	.name		= "Xilinx's GPIO controller",
+	.description	= "",
+	.type		= PLUGIN_TYPE_FPGA_IP,
+	.ip		= {
+	    .vlnv	= { "xilinx.com", "ip", "axi_gpio", NULL },
+		.type	= FPGA_IP_TYPE_MISC,
+	    .start	= gpio_start,
+	    .size	= 0
+	}
+};
+
+REGISTER_PLUGIN(&p)