From 7bff585d83444dba96c952578a265a5537fec459 Mon Sep 17 00:00:00 2001
From: Michael Sparmann <theseven@rockbox.org>
Date: Wed, 21 Oct 2009 18:52:09 +0000
Subject: iPod Nano 2G: "Fix" the latest PCM issues, channel swap and vinyl
 popping. The latter is a revert of the cache coherency patch for now, we need
 to find a better solution in the long term...

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23308 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/export/config-ipodnano2g.h       |  4 +++-
 firmware/target/arm/s5l8700/pcm-s5l8700.c | 15 ++++++++-------
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/firmware/export/config-ipodnano2g.h b/firmware/export/config-ipodnano2g.h
index 3b50238c02..d325dd7223 100644
--- a/firmware/export/config-ipodnano2g.h
+++ b/firmware/export/config-ipodnano2g.h
@@ -105,6 +105,8 @@
 /* Define the type of audio codec */
 #define HAVE_WM8975
 
+#define HAVE_PCM_DMA_ADDRESS
+
 /* Define this for LCD backlight available */
 #define HAVE_BACKLIGHT
 #define HAVE_BACKLIGHT_BRIGHTNESS
@@ -205,5 +207,5 @@
 #define USB_VENDOR_ID 0x05AC
 #define USB_PRODUCT_ID 0x1260
 #define USB_NUM_ENDPOINTS 5
-/* #define USE_ROCKBOX_USB - needs testing */
+#define USE_ROCKBOX_USB
 #define USB_DEVBSS_ATTR __attribute__((aligned(16)))
diff --git a/firmware/target/arm/s5l8700/pcm-s5l8700.c b/firmware/target/arm/s5l8700/pcm-s5l8700.c
index fd41da1432..219f682e2d 100644
--- a/firmware/target/arm/s5l8700/pcm-s5l8700.c
+++ b/firmware/target/arm/s5l8700/pcm-s5l8700.c
@@ -105,7 +105,7 @@ static void play_next(void *addr, size_t size)
                       dma_callback);
     
     /* DMA channel on */
-    clean_dcache();
+//    clean_dcache();
     dma_enable_channel(DMA_IISOUT_CHANNEL);
 }
 
@@ -139,7 +139,8 @@ void pcm_play_dma_start(const void *addr, size_t size)
     PCON5 = (PCON5 & ~(0xFFFF0000)) | 0x77720000;
     PCON6 = (PCON6 & ~(0x0F000000)) | 0x02000000;
 
-    I2STXCON = (0x10 << 16) |  /* burst length */
+    I2STXCON = (1 << 20) |  /* undocumented */
+               (DMA_IISOUT_BLEN << 16) |  /* burst length */
                (0 << 15) |  /* 0 = falling edge */
                (0 << 13) |  /* 0 = basic I2S format */
                (0 << 12) |  /* 0 = MSB first */
@@ -162,7 +163,7 @@ void pcm_play_dma_start(const void *addr, size_t size)
 #endif
     
     /* S3: DMA channel 0 on */
-    clean_dcache();
+//    clean_dcache();
     dma_enable_channel(DMA_IISOUT_CHANNEL);
 
     /* S4: IIS Tx clock on */
@@ -190,14 +191,14 @@ void pcm_play_dma_stop(void)
                (0 << 0);    /* 0 = LRCK on */
 }
 
-/* pause playback by disabling further DMA requests */
+/* pause playback by disabling the I2S interface */
 void pcm_play_dma_pause(bool pause)
 {
     if (pause) {
-        I2STXCOM &= ~(1 << 1);  /* DMA request enable */
+        I2STXCOM |= (1 << 0);   /* LRCK off */
     }
     else {
-        I2STXCOM |= (1 << 1);   /* DMA request enable */
+        I2STXCOM &= ~(1 << 0);  /* LRCK on */
     }
 }
 
@@ -267,7 +268,7 @@ const void * pcm_play_dma_get_peak_buffer(int *count)
 void * pcm_dma_addr(void *addr)
 {
     if (addr != NULL)
-        addr = UNCACHED_ADDR(addr);
+        addr = (void*)((uintptr_t)addr | 0x40000000);
     return addr;
 }
 #endif
-- 
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