x1000: core PCM recording support

Change-Id: I71883272cc3bffadc1235b0931c3f42bb38e4c1e

3 files changed, 135 insertions, 55 deletions

diff --git a/firmware/export/x1000.h b/firmware/export/x1000.h
index 102d4ec978..de3d394c02 100644
--- a/firmware/export/x1000.h
+++ b/firmware/export/x1000.h
@@ -57,6 +57,11 @@
 #define X1000_STACKSIZE         0x1e00
 #define X1000_IRQSTACKSIZE      0x300
 
+/* Required for pcm_rec_dma_get_peak_buffer(), doesn't do anything
+ * except on targets with recording. */
+#define HAVE_PCM_DMA_ADDRESS
+#define HAVE_PCM_REC_DMA_ADDRESS
+
 /* Convert kseg0 address to physical address or uncached address */
 #define PHYSADDR(x)     ((unsigned long)(x) & 0x1fffffff)
 #define UNCACHEDADDR(x) (PHYSADDR(x) | 0xa0000000)
diff --git a/firmware/target/mips/ingenic_x1000/debug-x1000.c b/firmware/target/mips/ingenic_x1000/debug-x1000.c
index 98b8f95fb5..236442a880 100644
--- a/firmware/target/mips/ingenic_x1000/debug-x1000.c
+++ b/firmware/target/mips/ingenic_x1000/debug-x1000.c
@@ -118,12 +118,18 @@ static bool dbg_gpios(void)
 }
 
 extern volatile unsigned aic_tx_underruns;
+#ifdef HAVE_RECORDING
+extern volatile unsigned aic_rx_overruns;
+#endif
 
 static bool dbg_audio(void)
 {
     do {
         lcd_clear_display();
         lcd_putsf(0, 0, "TX underruns: %u", aic_tx_underruns);
+#ifdef HAVE_RECORDING
+        lcd_putsf(0, 1, "RX overruns:  %u", aic_rx_overruns);
+#endif
         lcd_update();
     } while(get_action(CONTEXT_STD, HZ) != ACTION_STD_CANCEL);
 
diff --git a/firmware/target/mips/ingenic_x1000/pcm-x1000.c b/firmware/target/mips/ingenic_x1000/pcm-x1000.c
index ef54d45e62..7d1c83a35a 100644
--- a/firmware/target/mips/ingenic_x1000/pcm-x1000.c
+++ b/firmware/target/mips/ingenic_x1000/pcm-x1000.c
@@ -7,7 +7,7 @@
  *                     \/            \/     \/    \/            \/
  * $Id$
  *
- * Copyright (C) 2021 Aidan MacDonald
+ * Copyright (C) 2021-2022 Aidan MacDonald
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -31,28 +31,31 @@
 #include "x1000/aic.h"
 #include "x1000/cpm.h"
 
-#define AIC_STATE_STOPPED   0
-#define AIC_STATE_PLAYING   1
+#define AIC_STATE_STOPPED   0x00
+#define AIC_STATE_PLAYING   0x01
+#define AIC_STATE_RECORDING 0x02
 
 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 int play_lock = 0;
+static volatile int play_dma_pending_event = DMA_EVENT_NONE;
+static dma_desc play_dma_desc;
 static void pcm_play_dma_int_cb(int event);
+
 #ifdef HAVE_RECORDING
+volatile unsigned aic_rx_overruns = 0;
+static int rec_lock = 0;
+static volatile int rec_dma_pending_event = DMA_EVENT_NONE;
+static dma_desc rec_dma_desc;
+
 static void pcm_rec_dma_int_cb(int event);
 #endif
 
 void pcm_play_dma_init(void)
 {
-    /* Ungate clock, assign pins. NB this overlaps with pins labeled "sa0-sa4"
-     * on Ingenic's datasheets but I'm not sure what they are. Probably safe to
-     * assume they are not useful to Rockbox... */
+    /* Ungate clock */
     jz_writef(CPM_CLKGR, AIC(0));
 
     /* Configure AIC with some sane defaults */
@@ -79,7 +82,7 @@ void pcm_play_dma_init(void)
 #endif
 
     /* Set DMA settings */
-    jz_writef(AIC_CFG, TFTH(16), RFTH(16));
+    jz_writef(AIC_CFG, TFTH(16), RFTH(15));
     dma_set_callback(DMA_CHANNEL_AUDIO, pcm_play_dma_int_cb);
 #ifdef HAVE_RECORDING
     dma_set_callback(DMA_CHANNEL_RECORD, pcm_rec_dma_int_cb);
@@ -106,23 +109,23 @@ void pcm_dma_apply_settings(void)
     audiohw_set_frequency(pcm_fsel);
 }
 
-static void pcm_dma_start(const void* addr, size_t size)
+static void play_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));
+    play_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));
+    play_dma_desc.sa = PHYSADDR(addr);
+    play_dma_desc.ta = PHYSADDR(JA_AIC_DR);
+    play_dma_desc.tc = size;
+    play_dma_desc.sd = 0;
+    play_dma_desc.rt = jz_orf(DMA_CHN_RT, TYPE_V(I2S_TX));
+    play_dma_desc.pad0 = 0;
+    play_dma_desc.pad1 = 0;
+
+    commit_dcache_range(&play_dma_desc, sizeof(dma_desc));
     commit_dcache_range(addr, size);
 
-    REG_DMA_CHN_DA(DMA_CHANNEL_AUDIO) = PHYSADDR(&aic_dma_desc);
+    REG_DMA_CHN_DA(DMA_CHANNEL_AUDIO) = PHYSADDR(&play_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));
@@ -130,13 +133,13 @@ static void pcm_dma_start(const void* addr, size_t size)
     pcm_play_dma_status_callback(PCM_DMAST_STARTED);
 }
 
-static void pcm_dma_handle_event(int event)
+static void play_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);
+            play_dma_start(addr, size);
     } else if(event == DMA_EVENT_NONE) {
         /* ignored, so callers don't need to check for this */
     } else {
@@ -146,20 +149,20 @@ static void pcm_dma_handle_event(int event)
 
 static void pcm_play_dma_int_cb(int event)
 {
-    if(aic_lock) {
-        aic_dma_pending_event = event;
+    if(play_lock) {
+        play_dma_pending_event = event;
         return;
     } else {
-        pcm_dma_handle_event(event);
+        play_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;
+    play_dma_pending_event = DMA_EVENT_NONE;
+    aic_state |= AIC_STATE_PLAYING;
 
-    pcm_dma_start(addr, size);
+    play_dma_start(addr, size);
     jz_writef(AIC_CCR, TDMS(1), ETUR(1), ERPL(1));
 }
 
@@ -168,21 +171,23 @@ 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;
+    play_dma_pending_event = DMA_EVENT_NONE;
+    aic_state &= ~AIC_STATE_PLAYING;
 }
 
 void pcm_play_lock(void)
 {
-    ++aic_lock;
+    int irq = disable_irq_save();
+    ++play_lock;
+    restore_irq(irq);
 }
 
 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;
+    if(--play_lock == 0 && (aic_state & AIC_STATE_PLAYING)) {
+        play_dma_handle_event(play_dma_pending_event);
+        play_dma_pending_event = DMA_EVENT_NONE;
     }
 
     restore_irq(irq);
@@ -193,11 +198,56 @@ void pcm_play_unlock(void)
  * Recording
  */
 
-/* FIXME need to implement this!! */
+static void rec_dma_start(void* addr, size_t size)
+{
+    /* NOTE: Rockbox always records in stereo and the AIC pushes in the
+     * sample for each channel separately. One frame therefore requires
+     * two 16-bit transfers from the AIC. */
+    rec_dma_desc.cm = jz_orf(DMA_CHN_CM, SAI(0), DAI(1), RDIL(6),
+                             SP_V(16BIT), DP_V(16BIT), TSZ_V(16BIT),
+                             STDE(0), TIE(1), LINK(0));
+    rec_dma_desc.sa = PHYSADDR(JA_AIC_DR);
+    rec_dma_desc.ta = PHYSADDR(addr);
+    rec_dma_desc.tc = size / 2;
+    rec_dma_desc.sd = 0;
+    rec_dma_desc.rt = jz_orf(DMA_CHN_RT, TYPE_V(I2S_RX));
+    rec_dma_desc.pad0 = 0;
+    rec_dma_desc.pad1 = 0;
+
+    commit_dcache_range(&rec_dma_desc, sizeof(dma_desc));
+    if((unsigned long)addr < 0xa0000000ul)
+        discard_dcache_range(addr, size);
+
+    REG_DMA_CHN_DA(DMA_CHANNEL_RECORD) = PHYSADDR(&rec_dma_desc);
+    jz_writef(DMA_CHN_CS(DMA_CHANNEL_RECORD), DES8(1), NDES(0));
+    jz_set(DMA_DB, 1 << DMA_CHANNEL_RECORD);
+    jz_writef(DMA_CHN_CS(DMA_CHANNEL_RECORD), CTE(1));
+
+    pcm_rec_dma_status_callback(PCM_DMAST_STARTED);
+}
+
+static void rec_dma_handle_event(int event)
+{
+    if(event == DMA_EVENT_COMPLETE) {
+        void* addr;
+        size_t size;
+        if(pcm_rec_dma_complete_callback(PCM_DMAST_OK, &addr, &size))
+            rec_dma_start(addr, size);
+    } else if(event == DMA_EVENT_NONE) {
+        /* ignored, so callers don't need to check for this */
+    } else {
+        pcm_rec_dma_status_callback(PCM_DMAST_ERR_DMA);
+    }
+}
 
 static void pcm_rec_dma_int_cb(int event)
 {
-    (void)event;
+    if(rec_lock) {
+        rec_dma_pending_event = event;
+        return;
+    } else {
+        rec_dma_handle_event(event);
+    }
 }
 
 void pcm_rec_dma_init(void)
@@ -210,40 +260,52 @@ void pcm_rec_dma_close(void)
 
 void pcm_rec_dma_start(void* addr, size_t size)
 {
-    (void)addr;
-    (void)size;
+    rec_dma_pending_event = DMA_EVENT_NONE;
+    aic_state |= AIC_STATE_RECORDING;
+
+    rec_dma_start(addr, size);
+    jz_writef(AIC_CCR, RDMS(1), EROR(1), EREC(1));
 }
 
 void pcm_rec_dma_stop(void)
 {
+    jz_writef(AIC_CCR, RDMS(0), EROR(0), EREC(0));
+    jz_writef(AIC_CCR, RFLUSH(1));
+
+    rec_dma_pending_event = DMA_EVENT_NONE;
+    aic_state &= ~AIC_STATE_RECORDING;
 }
 
 void pcm_rec_lock(void)
 {
-
+    int irq = disable_irq_save();
+    ++rec_lock;
+    restore_irq(irq);
 }
 
 void pcm_rec_unlock(void)
 {
+    int irq = disable_irq_save();
+    if(--rec_lock == 0 && (aic_state & AIC_STATE_RECORDING)) {
+        rec_dma_handle_event(rec_dma_pending_event);
+        rec_dma_pending_event = DMA_EVENT_NONE;
+    }
 
+    restore_irq(irq);
 }
 
 const void* pcm_rec_dma_get_peak_buffer(void)
 {
-    return NULL;
-}
-
-void audio_set_output_source(int source)
-{
-    (void)source;
+    return (const void*)UNCACHEDADDR(REG_DMA_CHN_TA(DMA_CHANNEL_RECORD));
 }
+#endif /* HAVE_RECORDING */
 
-void audio_input_mux(int source, unsigned flags)
+#ifdef HAVE_PCM_DMA_ADDRESS
+void* pcm_dma_addr(void* addr)
 {
-    (void)source;
-    (void)flags;
+    return (void*)UNCACHEDADDR(addr);
 }
-#endif /* HAVE_RECORDING */
+#endif
 
 void AIC(void)
 {
@@ -251,4 +313,11 @@ void AIC(void)
         aic_tx_underruns += 1;
         jz_writef(AIC_SR, TUR(0));
     }
+
+#ifdef HAVE_RECORDING
+    if(jz_readf(AIC_SR, ROR)) {
+        aic_rx_overruns += 1;
+        jz_writef(AIC_SR, ROR(0));
+    }
+#endif /* HAVE_RECORDING */
 }