1 files changed, 46 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/aic-x1000.h b/firmware/target/mips/ingenic_x1000/aic-x1000.h
new file mode 100644
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+++ b/firmware/target/mips/ingenic_x1000/aic-x1000.h
@@ -0,0 +1,46 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 __AIC_X1000_H__
+#define __AIC_X1000_H__
+
+#include "clk-x1000.h"
+#include <stdbool.h>
+
+/* Set frequency of I2S master clock supplied by AIC. Has no use if an
+ * external DAC is supplying the master clock. Must be called with the
+ * bit clock disabled.
+ *
+ * - clksrc can be one of EXCLK, SCLK_A, MPLL.
+ * - This function does not modify PLL settings. It's the caller's job
+ *   to ensure the PLL is configured and runing.
+ * - fs is the audio sampling frequency (8 KHz - 192 KHz)
+ * - mult is multiplied by fs to get the master clock rate.
+ * - mult must be a multiple of 64 due to AIC bit clock requirements.
+ * - Note: EXCLK bypasses the decimal divider so it is not very flexible.
+ *   If using EXCLK you must set mult=0. If EXCLK is not a multiple of
+ *   the bit clock (= 64*fs), then the clock rate will be inaccurate.
+ *
+ * Returns zero on success and nonzero if the frequency is not achievable.
+ */
+extern int aic_i2s_set_mclk(x1000_clk_t clksrc, unsigned fs, unsigned mult);
+
+#endif /* __AIC_X1000_H__ */