FS#10048 : enable MMU and data cache on Sansa AMS to give a major speed up

- cache IRAM and DRAM
- map IRAM just next to DRAM to remove the need for -mlong-calls and reduce binsize
- tweak delays in Fuze button code
- tweak delays in Clip button code (down button sometimes doesn't respond anyway : an alternate driver is being worked on)

Before reporting any problem, please check your filesystem or format your player from the OF

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21228 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 11 insertions, 0 deletions

diff --git a/firmware/target/arm/as3525/pcm-as3525.c b/firmware/target/arm/as3525/pcm-as3525.c
index 5074941f4a..4f9e18523d 100644
--- a/firmware/target/arm/as3525/pcm-as3525.c
+++ b/firmware/target/arm/as3525/pcm-as3525.c
@@ -28,6 +28,7 @@
 #include "panic.h"
 #include "as3514.h"
 #include "audiohw.h"
+#include "mmu-arm.h"
 
 #define MAX_TRANSFER (4*((1<<11)-1)) /* maximum data we can transfer via DMA
                                       * i.e. 32 bits at once (size of I2SO_DATA)
@@ -69,6 +70,7 @@ static void play_start_pcm(void)
     CGU_PERI |= CGU_I2SOUT_APB_CLOCK_ENABLE;
     CGU_AUDIO |= (1<<11);
 
+    clean_dcache_range((void*)addr, size);  /* force write back */
     dma_enable_channel(1, (void*)addr, (void*)I2SOUT_DATA, DMA_PERI_I2SOUT,
                 DMAC_FLOWCTRL_DMAC_MEM_TO_PERI, true, false, size >> 2, DMA_S1,
                 dma_callback);
@@ -164,6 +166,15 @@ const void * pcm_play_dma_get_peak_buffer(int *count)
     return (const void*)dma_start_addr;
 }
 
+#ifdef HAVE_PCM_DMA_ADDRESS
+void * pcm_dma_addr(void *addr)
+{
+    if (addr != NULL)
+        addr = UNCACHED_ADDR(addr);
+    return addr;
+}
+#endif
+
 
 /****************************************************************************
  ** Recording DMA transfer