New port: FiiO M3K on bare metal

Change-Id: I7517e7d5459e129dcfc9465c6fbd708619888fbe

1 files changed, 44 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/i2c-x1000.h b/firmware/target/mips/ingenic_x1000/i2c-x1000.h
new file mode 100644
index 0000000000..e76624d511
--- /dev/null
+++ b/firmware/target/mips/ingenic_x1000/i2c-x1000.h
@@ -0,0 +1,44 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 Aidan MacDonald
+ *
+ * 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 __I2C_X1000_H__
+#define __I2C_X1000_H__
+
+#include "i2c-async.h"
+
+#define I2C_FREQ_100K 100000
+#define I2C_FREQ_400K 400000
+
+extern void i2c_init(void);
+
+/* Configure the I2C controller prior to use.
+ *
+ * - freq: frequency of SCL, should be <= 400 KHz and >= 25 KHz
+ *   - use I2C_FREQ_100K for 100 KHz
+ *   - use I2C_FREQ_400K for 400 Khz
+ *   - use 0 to disable the controller completely
+ *   - frequencies below 25 KHz will violate timing constraints
+ *
+ * TODO: move this to the i2c-async API, it's simple enough
+ */
+extern void i2c_x1000_set_freq(int chn, int freq);
+
+#endif /* __I2C_X1000_H__ */