Initial commit for the Sony NWZ linux port

SUPPORTED SERIES:
- NWZ-E450
- NWZ-E460
- NWZ-E470
- NWZ-E580
- NWZ-A10

NOTES:
- bootloader makefile convert an extra font to be installed alongside the bootloader
  since sysfont is way too small
- the toolsicon bitmap comes from the Oxygen iconset
- touchscreen driver is untested

TODO:
- implement audio routing driver (pcm is handled by pcm-alsa)
- fix playback: it crashes on illegal instruction in DEBUG builds
- find out why the browser starts at / instead of /contents
- implement radio support
- implement return to OF for usb handling
- calibrate battery curve (NB: of can report a battery level on a 0-5 scale but
  probabl don't want to use that ?)
- implement simulator build (we need a nice image of the player)
- figure out if we can detect jack removal

POTENTIAL TODOS:
- try to build a usb serial gadget and gdbserver

Change-Id: Ic77d71e0651355d47cc4e423a40fb64a60c69a80

firmware/target/hosted/sonynwz/nvp-nwz.h

@@ -0,0 +1,41 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2016 by Amaury Pouly
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef __NVP_NWZ_H__
+#define __NVP_NWZ_H__
+
+#include "system.h"
+#include "nwz-db.h"
+
+/* get model ID */
+unsigned long nwz_get_model_id(void);
+/* get model NAME (ie NWZ-E463) */
+const char *nwz_get_model_name(void);
+/* return series (index into nwz_db) */
+int nwz_get_series(void);
+
+/* read a nvp node and return its size, if the data pointer is null, then simply
+ * return the size, return -1 on error */
+int nwz_nvp_read(enum nwz_nvp_node_t node, void *data);
+/* write a nvp node, return 0 on success and -1 on error, the size of the buffer
+ * must be the one returned by nwz_nvp_read */
+int nwz_nvp_write(enum nwz_nvp_node_t node, void *data);
+
+#endif /* __NVP_NWZ_H__ */