[ARM] 3209/1: Configurable DMA-consistent memory region

[linux-2.6-omap-h63xx.git] / include / asm-arm / memory.h

diff --git a/include/asm-arm/memory.h b/include/asm-arm/memory.h
index a547ee598c6c9f2e1fa8968fb96be1a9c9ee0712..b4e1146ab682cf97fce022c83c8be81b1f02fc7e 100644 (file)
--- a/include/asm-arm/memory.h
+++ b/include/asm-arm/memory.h
@@ -25,6 +25,7 @@
 #include <linux/config.h>
 #include <linux/compiler.h>
 #include <asm/arch/memory.h>
+#include <asm/sizes.h>
 
 #ifndef TASK_SIZE
 /*
@@ -47,6 +48,14 @@
 #define PAGE_OFFSET            UL(0xc0000000)
 #endif
 
+/*
+ * Size of DMA-consistent memory region.  Must be multiple of 2M,
+ * between 2MB and 14MB inclusive.
+ */
+#ifndef CONSISTENT_DMA_SIZE
+#define CONSISTENT_DMA_SIZE SZ_2M
+#endif
+
 /*
  * Physical vs virtual RAM address space conversion.  These are
  * private definitions which should NOT be used outside memory.h
@@ -57,6 +66,12 @@
 #define __phys_to_virt(x)      ((x) - PHYS_OFFSET + PAGE_OFFSET)
 #endif
 
+/*
+ * Convert a physical address to a Page Frame Number and back
+ */
+#define        __phys_to_pfn(paddr)    ((paddr) >> PAGE_SHIFT)
+#define        __pfn_to_phys(pfn)      ((pfn) << PAGE_SHIFT)
+
 /*
  * The module space lives between the addresses given by TASK_SIZE
  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
@@ -122,6 +137,7 @@ static inline void *phys_to_virt(unsigned long x)
  */
 #define __pa(x)                        __virt_to_phys((unsigned long)(x))
 #define __va(x)                        ((void *)__phys_to_virt((unsigned long)(x)))
+#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 
 /*
  * Virtual <-> DMA view memory address translations