mips: Heavily rework DMA & caching code

Based on code originally written by Amaury Pouly (g#1789, g#1791, g#1527)
but rebased and heavily updated.

Change-Id: Ic794abb5e8d89feb4b88fc3abe854270fb28db70

1 files changed, 20 insertions, 14 deletions

diff --git a/firmware/target/mips/mmu-mips.h b/firmware/target/mips/mmu-mips.h
index 7e1e36d3f4..f96ddcc28d 100644
--- a/firmware/target/mips/mmu-mips.h
+++ b/firmware/target/mips/mmu-mips.h
@@ -28,19 +28,25 @@ void map_address(unsigned long virtual, unsigned long physical,
                  unsigned long length, unsigned int cache_flags);
 void mmu_init(void);
 
-#define HAVE_CPUCACHE_INVALIDATE
-//#define HAVE_CPUCACHE_FLUSH
-
-void __idcache_invalidate_all(void);
-void __icache_invalidate_all(void);
-void __dcache_invalidate_all(void);
-void __dcache_writeback_all(void);
-
-void dma_cache_wback_inv(unsigned long addr, unsigned long size);
-
-#define commit_discard_idcache   __idcache_invalidate_all
-#define commit_discard_icache    __icache_invalidate_all
-#define commit_discard_dcache    __dcache_invalidate_all
-#define commit_dcache            __dcache_writeback_all
+/* Commits entire DCache */
+void commit_dcache(void);
+/* Commit and discard entire DCache, will do writeback */
+void commit_discard_dcache(void);
+
+/* Write DCache back to RAM for the given range and remove cache lines
+ * from DCache afterwards */
+void commit_discard_dcache_range(const void *base, unsigned int size);
+
+/* Write DCache back to RAM for the given range */
+void commit_dcache_range(const void *base, unsigned int size);
+
+/*
+ * Remove cache lines for the given range from DCache
+ * will *NOT* do write back except for buffer edges not on a line boundary
+ */
+void discard_dcache_range(const void *base, unsigned int size);
+
+/* Discards the entire ICache, and commit+discards the entire DCache */
+void commit_discard_idcache(void);
 
 #endif /* __MMU_MIPS_INCLUDE_H */