MIPS: Add support for uncached accelerated mappings.

Loongson2f support video acceleration.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/624/
Patchwork: http://patchwork.linux-mips.org/patch/625/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index d6eb6134abec..1854336e56a2 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -390,6 +390,19 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 #include <asm-generic/pgtable.h>
 
 /*
+ * uncached accelerated TLB map for video memory access
+ */
+#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
+#define __HAVE_PHYS_MEM_ACCESS_PROT
+
+struct file;
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+                unsigned long size, pgprot_t vma_prot);
+int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
+                unsigned long size, pgprot_t *vma_prot);
+#endif
+
+/*
  * We provide our own get_unmapped area to cope with the virtual aliasing
  * constraints placed on us by the cache architecture.
  */