On 2015年11月16日 22:36, Thomas Chou wrote:
Add mapping between physical and virtual address.
Signed-off-by: Thomas Chou thomas@wytron.com.tw
arch/arc/include/asm/io.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
Drop this patch as it is taken cared by Alexey Brodkin.
- Thomas
diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h index 24b7337..273e9f9 100644 --- a/arch/arc/include/asm/io.h +++ b/arch/arc/include/asm/io.h @@ -15,6 +15,34 @@ static inline void sync(void) /* Not yet implemented */ }
+/*
- Given a physical address and a length, return a virtual address
- that can be used to access the memory range with the caching
- properties specified by "flags".
- */
+#define MAP_NOCACHE (0) +#define MAP_WRCOMBINE (0) +#define MAP_WRBACK (0) +#define MAP_WRTHROUGH (0)
+static inline void *map_physmem(phys_addr_t paddr, unsigned long len,
unsigned long flags)+{
- return (void *)(uintptr_t)paddr;
+}
+/*
- Take down a mapping set up by map_physmem().
- */
+static inline void unmap_physmem(void *vaddr, unsigned long flags) +{ +}
+static inline phys_addr_t virt_to_phys(void *vaddr) +{
- return (phys_addr_t)(uintptr_t)vaddr;
+}
- static inline u8 __raw_readb(const volatile void __iomem *addr) { u8 b;