New port: FiiO M3K on bare metal

Change-Id: I7517e7d5459e129dcfc9465c6fbd708619888fbe

1 files changed, 81 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/fiiom3k/audiohw-fiiom3k.c b/firmware/target/mips/ingenic_x1000/fiiom3k/audiohw-fiiom3k.c
new file mode 100644
index 0000000000..2f43809523
--- /dev/null
+++ b/firmware/target/mips/ingenic_x1000/fiiom3k/audiohw-fiiom3k.c
@@ -0,0 +1,81 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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.
+ *
+ ****************************************************************************/
+
+#include "audiohw.h"
+#include "system.h"
+#include "pcm_sampr.h"
+#include "logf.h"
+#include "aic-x1000.h"
+#include "i2c-x1000.h"
+#include "gpio-x1000.h"
+#include "x1000/aic.h"
+#include "x1000/cpm.h"
+
+void audiohw_init(void)
+{
+    /* Configure AIC for I2S operation */
+    jz_writef(CPM_CLKGR, AIC(0));
+    gpio_config(GPIO_B, 0x1f, GPIO_DEVICE(1));
+    jz_writef(AIC_I2SCR, STPBK(1));
+
+    /* Operate as I2S master, use external codec */
+    jz_writef(AIC_CFG, AUSEL(1), ICDC(0), BCKD(1), SYNCD(1), LSMP(1));
+    jz_writef(AIC_I2SCR, ESCLK(1), AMSL(0));
+
+    /* Stereo audio, packed 16 bit samples */
+    jz_writef(AIC_CCR, PACK16(1), CHANNEL(1), OSS(1));
+
+    /* Initialize DAC */
+    i2c_x1000_set_freq(AK4376_BUS, I2C_FREQ_400K);
+    ak4376_init();
+}
+
+void audiohw_postinit(void)
+{
+}
+
+void audiohw_close(void)
+{
+    ak4376_close();
+}
+
+void ak4376_set_pdn_pin(int level)
+{
+    gpio_config(GPIO_A, 1 << 16, GPIO_OUTPUT(level ? 1 : 0));
+}
+
+int ak4376_set_mclk_freq(int hw_freq, bool enabled)
+{
+    /* Get the multiplier */
+    int freq = hw_freq_sampr[hw_freq];
+    int mult = freq >= SAMPR_176 ? 128 : 256;
+
+    if(enabled) {
+        /* Set the new frequency; clock is enabled afterward */
+        if(aic_i2s_set_mclk(X1000_CLK_SCLK_A, freq, mult))
+            logf("WARNING: unachievable audio rate %d x %d!?", freq, mult);
+    } else {
+        /* Shut off the clock */
+        jz_writef(AIC_I2SCR, STPBK(1));
+    }
+
+    return mult;
+}