Make storage alignement use cache alignement macros

Introduce STORAGE_ALIGN_DOWN, STORAGE_PAD (using new CACHE_PAD) and
STORAGE_OVERLAP (using new CACHE_OVERLAP), make them useful only when
PROC_NEEDS_CACHEALIGN and STORAGE_NEEDS_ALIGN are defined

Modify PP and nano2g system-target.h accordingly

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25336 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 18 insertions, 18 deletions

diff --git a/firmware/export/config.h b/firmware/export/config.h
index e678590b44..9d8dc41111 100644
--- a/firmware/export/config.h
+++ b/firmware/export/config.h
@@ -914,23 +914,6 @@ Lyre prototype 1 */
 
 #endif /* HAVE_USBSTACK */
 
-/* Storage alignment: the mask specifies a mask of bits which should be
- * clear in addresses used for storage_{read,write}_sectors(). This is
- * only relevant for buffers that will contain one or more whole sectors.
- */ 
-
-/* PP502x DMA requires an alignment of at least 16 bytes */
-#ifdef HAVE_ATA_DMA
-#ifdef  CPU_PP502x
-#define STORAGE_ALIGN_MASK 15
-#endif
-#endif /* HAVE_ATA_DMA */
-
-/* by default no alignment is required */
-#ifndef STORAGE_ALIGN_MASK
-#define STORAGE_ALIGN_MASK 0
-#endif
-
 /* This attribute can be used to enable to detection of plugin file handles leaks.
  * When enabled, the plugin core will monitor open/close/creat and when the plugin exits
  * will display an error message if the plugin leaked some file handles */
diff --git a/firmware/export/config/ipodnano2g.h b/firmware/export/config/ipodnano2g.h
index 0b690416a7..989d56338d 100644
--- a/firmware/export/config/ipodnano2g.h
+++ b/firmware/export/config/ipodnano2g.h
@@ -219,6 +219,5 @@
 //#define IPOD_ACCESSORY_PROTOCOL
 //#define HAVE_SERIAL
 
-#define STORAGE_ALIGN_MASK 15
 #define USB_WRITE_BUFFER_SIZE (1024*64)
 
diff --git a/firmware/export/system.h b/firmware/export/system.h
index 505b167af9..fee188802b 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -312,6 +312,16 @@ static inline void cpucache_flush(void)
 /* Aligns a buffer pointer and size to proper boundaries */
 #define CACHEALIGN_BUFFER(start, size) \
     ALIGN_BUFFER((start), (size), CACHEALIGN_SIZE)
+/* Pad a size so the buffer can be aligned later */
+#define CACHE_PAD(x) ((x) + CACHEALIGN_SIZE - 1)
+/* Number of bytes in the last cacheline assuming buffer of size x is aligned */
+#define CACHE_OVERLAP(x) (x & (CACHEALIGN_SIZE - 1))
+
+#ifdef NEEDS_STORAGE_ALIGN
+#define STORAGE_ALIGN_DOWN(x) CACHEALIGN_DOWN(x)
+#define STORAGE_PAD(x) CACHE_PAD(x)
+#define STORAGE_OVERLAP(x) CACHE_OVERLAP(x)
+#endif
 
 #else /* ndef PROC_NEEDS_CACHEALIGN */
 
@@ -323,9 +333,17 @@ static inline void cpucache_flush(void)
 #define CACHEALIGN_DOWN(x) (x)
 /* Make no adjustments */
 #define CACHEALIGN_BUFFER(start, size)
+#define CACHE_PAD(x) (x)
+#define CACHE_OVERLAP(x) 0
 
 #endif /* PROC_NEEDS_CACHEALIGN */
 
+#if !defined(PROC_NEEDS_CACHEALIGN) || !defined(NEEDS_STORAGE_ALIGN)
+#define STORAGE_ALIGN_DOWN(x) (x)
+#define STORAGE_PAD(x) (x)
+#define STORAGE_OVERLAP(x) 0
+#endif
+
 /* Double-cast to avoid 'dereferencing type-punned pointer will
  * break strict aliasing rules' B.S. */
 #define PUN_PTR(type, p) ((type)(intptr_t)(p))