1 files changed, 165 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/pcm-x1000.c b/firmware/target/mips/ingenic_x1000/pcm-x1000.c
new file mode 100644
index 0000000000..9ae6f5a956
--- /dev/null
+++ b/firmware/target/mips/ingenic_x1000/pcm-x1000.c
@@ -0,0 +1,165 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 "system.h"
+#include "kernel.h"
+#include "audiohw.h"
+#include "pcm.h"
+#include "pcm-internal.h"
+#include "panic.h"
+#include "dma-x1000.h"
+#include "irq-x1000.h"
+#include "x1000/aic.h"
+
+#define AIC_STATE_STOPPED   0
+#define AIC_STATE_PLAYING   1
+
+volatile unsigned aic_tx_underruns = 0;
+
+static int aic_state = AIC_STATE_STOPPED;
+
+static int aic_lock = 0;
+static volatile int aic_dma_pending_event = DMA_EVENT_NONE;
+
+static dma_desc aic_dma_desc;
+
+static void pcm_dma_int_cb(int event);
+
+void pcm_play_dma_init(void)
+{
+    /* Let the target initialize its hardware and setup the AIC */
+    audiohw_init();
+
+    /* Set DMA callback */
+    dma_set_callback(DMA_CHANNEL_AUDIO, pcm_dma_int_cb);
+
+    /* Program FIFO threshold -- DMA settings must match */
+    jz_writef(AIC_CFG, TFTH(16));
+
+    /* Ensure all playback is disabled */
+    jz_writef(AIC_CCR, ERPL(0));
+
+    /* Enable the controller */
+    jz_writef(AIC_CFG, ENABLE(1));
+
+    /* Enable interrupts */
+    system_enable_irq(IRQ_AIC);
+}
+
+void pcm_play_dma_postinit(void)
+{
+    audiohw_postinit();
+}
+
+void pcm_dma_apply_settings(void)
+{
+    audiohw_set_frequency(pcm_fsel);
+}
+
+static void pcm_dma_start(const void* addr, size_t size)
+{
+    aic_dma_desc.cm = jz_orf(DMA_CHN_CM, SAI(1), DAI(0), RDIL(9),
+                             SP_V(32BIT), DP_V(32BIT), TSZ_V(AUTO),
+                             STDE(0), TIE(1), LINK(0));
+    aic_dma_desc.sa = PHYSADDR(addr);
+    aic_dma_desc.ta = PHYSADDR(JA_AIC_DR);
+    aic_dma_desc.tc = size;
+    aic_dma_desc.sd = 0;
+    aic_dma_desc.rt = jz_orf(DMA_CHN_RT, TYPE_V(I2S_TX));
+    aic_dma_desc.pad0 = 0;
+    aic_dma_desc.pad1 = 0;
+
+    commit_dcache_range(&aic_dma_desc, sizeof(dma_desc));
+    commit_dcache_range(addr, size);
+
+    REG_DMA_CHN_DA(DMA_CHANNEL_AUDIO) = PHYSADDR(&aic_dma_desc);
+    jz_writef(DMA_CHN_CS(DMA_CHANNEL_AUDIO), DES8(1), NDES(0));
+    jz_set(DMA_DB, 1 << DMA_CHANNEL_AUDIO);
+    jz_writef(DMA_CHN_CS(DMA_CHANNEL_AUDIO), CTE(1));
+
+    pcm_play_dma_status_callback(PCM_DMAST_STARTED);
+}
+
+static void pcm_dma_handle_event(int event)
+{
+    if(event == DMA_EVENT_COMPLETE) {
+        const void* addr;
+        size_t size;
+        if(pcm_play_dma_complete_callback(PCM_DMAST_OK, &addr, &size))
+            pcm_dma_start(addr, size);
+    } else if(event == DMA_EVENT_NONE) {
+        /* ignored, so callers don't need to check for this */
+    } else {
+        pcm_play_dma_status_callback(PCM_DMAST_ERR_DMA);
+    }
+}
+
+static void pcm_dma_int_cb(int event)
+{
+    if(aic_lock) {
+        aic_dma_pending_event = event;
+        return;
+    } else {
+        pcm_dma_handle_event(event);
+    }
+}
+
+void pcm_play_dma_start(const void* addr, size_t size)
+{
+    aic_dma_pending_event = DMA_EVENT_NONE;
+    aic_state = AIC_STATE_PLAYING;
+
+    pcm_dma_start(addr, size);
+    jz_writef(AIC_CCR, TDMS(1), ETUR(1), ERPL(1));
+}
+
+void pcm_play_dma_stop(void)
+{
+    jz_writef(AIC_CCR, TDMS(0), ETUR(0), ERPL(0));
+    jz_writef(AIC_CCR, TFLUSH(1));
+
+    aic_dma_pending_event = DMA_EVENT_NONE;
+    aic_state = AIC_STATE_STOPPED;
+}
+
+void pcm_play_lock(void)
+{
+    ++aic_lock;
+}
+
+void pcm_play_unlock(void)
+{
+    int irq = disable_irq_save();
+    if(--aic_lock == 0 && aic_state == AIC_STATE_PLAYING) {
+        pcm_dma_handle_event(aic_dma_pending_event);
+        aic_dma_pending_event = DMA_EVENT_NONE;
+    }
+
+    restore_irq(irq);
+}
+
+void AIC(void)
+{
+    if(jz_readf(AIC_SR, TUR)) {
+        aic_tx_underruns += 1;
+        jz_writef(AIC_SR, TUR(0));
+    }
+}