From e38f3abac90b1fd10c22a0769e66d724f53502ad Mon Sep 17 00:00:00 2001
From: Maurus Cuelenaere <mcuelenaere@gmail.com>
Date: Mon, 27 Jul 2009 18:58:22 +0000
Subject: Jz4740 PCM driver: do 32-bit or 16-bit burst sizes if 16-byte ones
 won't fit (improves PDBox)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22074 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/mips/ingenic_jz47xx/pcm-jz4740.c | 64 +++++++++++++++++++++---
 1 file changed, 56 insertions(+), 8 deletions(-)

(limited to 'firmware/target')

diff --git a/firmware/target/mips/ingenic_jz47xx/pcm-jz4740.c b/firmware/target/mips/ingenic_jz47xx/pcm-jz4740.c
index 32a14744df..a4ecd0b786 100644
--- a/firmware/target/mips/ingenic_jz47xx/pcm-jz4740.c
+++ b/firmware/target/mips/ingenic_jz47xx/pcm-jz4740.c
@@ -65,16 +65,35 @@ void pcm_dma_apply_settings(void)
 static void* playback_address;
 static inline void set_dma(const void *addr, size_t size)
 {
-    logf("%x %x %d %d %x", (unsigned int)addr, size, (REG_AIC_SR>>24) & 0x20, (REG_AIC_SR>>8) & 0x20, REG_AIC_SR & 0xF);
+    int burst_size;
+    logf("%x %d %x", (unsigned int)addr, size, REG_AIC_SR);
+
+    if(size % 16)
+    {
+        if(size % 4)
+        {
+            size /= 2;
+            burst_size = DMAC_DCMD_DS_16BIT;
+        }
+        else
+        {
+            size /= 4;
+            burst_size = DMAC_DCMD_DS_32BIT;
+        }
+    }
+    else
+    {
+        size /= 16;
+        burst_size = DMAC_DCMD_DS_16BYTE;
+    }
 
     __dcache_writeback_all();
     REG_DMAC_DCCSR(DMA_AIC_TX_CHANNEL) = DMAC_DCCSR_NDES;
     REG_DMAC_DSAR(DMA_AIC_TX_CHANNEL)  = PHYSADDR((unsigned long)addr);
     REG_DMAC_DTAR(DMA_AIC_TX_CHANNEL)  = PHYSADDR((unsigned long)AIC_DR);
-    REG_DMAC_DTCR(DMA_AIC_TX_CHANNEL)  = size / 16;
+    REG_DMAC_DTCR(DMA_AIC_TX_CHANNEL)  = size;
     REG_DMAC_DRSR(DMA_AIC_TX_CHANNEL)  = DMAC_DRSR_RS_AICOUT;
-    REG_DMAC_DCMD(DMA_AIC_TX_CHANNEL)  = (DMAC_DCMD_SAI | DMAC_DCMD_SWDH_32 | DMAC_DCMD_DS_16BYTE | DMAC_DCMD_DWDH_16 | DMAC_DCMD_TIE |
-                                          DMAC_DCMD_RDIL_IGN);
+    REG_DMAC_DCMD(DMA_AIC_TX_CHANNEL)  = (DMAC_DCMD_SAI | DMAC_DCMD_SWDH_32 | burst_size | DMAC_DCMD_DWDH_16 | DMAC_DCMD_TIE);
 
     playback_address = (void*)addr;
 }
@@ -181,10 +200,37 @@ void pcm_play_dma_pause(bool pause)
     restore_irq(flags);
 }
 
+static int get_dma_count(void)
+{
+    int count = REG_DMAC_DTCR(DMA_AIC_TX_CHANNEL);
+    switch(REG_DMAC_DCMD(DMA_AIC_TX_CHANNEL) & DMAC_DCMD_DS_MASK)
+    {
+        case DMAC_DCMD_DS_16BIT:
+            count *= 2;
+            break;
+        case DMAC_DCMD_DS_32BIT:
+            count *= 4;
+            break;
+        case DMAC_DCMD_DS_16BYTE:
+            count *= 16;
+            break;
+    }
+
+    return count;
+}
+
 size_t pcm_get_bytes_waiting(void)
 {
-    return REG_DMAC_DCCSR(DMA_AIC_TX_CHANNEL) & DMAC_DCCSR_EN ?
-            (REG_DMAC_DTCR(DMA_AIC_TX_CHANNEL) * 16) & ~3 : 0;
+    int bytes, flags = disable_irq_save();
+
+    if(REG_DMAC_DCCSR(DMA_AIC_TX_CHANNEL) & DMAC_DCCSR_EN)
+        bytes = get_dma_count() & ~3;
+    else
+        bytes = 0;
+
+    restore_irq(flags);
+
+    return bytes;
 }
 
 const void * pcm_play_dma_get_peak_buffer(int *count)
@@ -194,8 +240,9 @@ const void * pcm_play_dma_get_peak_buffer(int *count)
     const void* addr;
     if(REG_DMAC_DCCSR(DMA_AIC_TX_CHANNEL) & DMAC_DCCSR_EN)
     {
-        *count = REG_DMAC_DTCR(DMA_AIC_TX_CHANNEL)*16 >> 2;
-        addr = (const void*)(playback_address + ((REG_DMAC_DTCR(DMA_AIC_TX_CHANNEL)*16 + 2) & ~3));
+        int bytes = get_dma_count();
+        *count = bytes >> 2;
+        addr = (const void*)((int)(playback_address + bytes + 2) & ~3);
     }
     else
     {
@@ -210,6 +257,7 @@ const void * pcm_play_dma_get_peak_buffer(int *count)
 
 void audiohw_close(void)
 {
+    /* TODO: prevent pop */
 }
 
 #ifdef HAVE_RECORDING
-- 
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