Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
---
arch/mips/include/asm/io.h | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index ff66ea5..dcda857 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -12,6 +12,7 @@
#include <linux/compiler.h>
#include <asm/types.h>
+#include <asm/addrspace.h>
#include <asm/byteorder.h>
void *dma_alloc_coherent(size_t size);
@@ -21,6 +22,40 @@ void dma_clean_range(unsigned long, unsigned long);
void dma_flush_range(unsigned long, unsigned long);
void dma_inv_range(unsigned long, unsigned long);
+/*
+ * virt_to_phys - map virtual addresses to physical
+ * @address: address to remap
+ *
+ * The returned physical address is the physical (CPU) mapping for
+ * the memory address given. It is only valid to use this function on
+ * addresses directly mapped or allocated via kmalloc.
+ *
+ * This function does not give bus mappings for DMA transfers. In
+ * almost all conceivable cases a device driver should not be using
+ * this function
+ */
+static inline unsigned long virt_to_phys(const void *address)
+{
+ return (unsigned long)address & 0x3fffffff;
+}
+
+/*
+ * phys_to_virt - map physical address to virtual
+ * @address: address to remap
+ *
+ * The returned virtual address is a current CPU mapping for
+ * the memory address given. It is only valid to use this function on
+ * addresses that have a kernel mapping
+ *
+ * This function does not handle bus mappings for DMA transfers. In
+ * almost all conceivable cases a device driver should not be using
+ * this function
+ */
+static inline void *phys_to_virt(unsigned long address)
+{
+ return (void *)(KSEG0 | (address & 0x3fffffff));
+}
+
#define IO_SPACE_LIMIT 0
/*****************************************************************************/
--
1.9.0
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