[PATCH 6/8] powerpc/boot: Add mfdcrx

[Tony Breeds]

Needed for currituck support.

Signed-off-by: Tony Breeds <tony at bakeyournoodle.com>
---
 arch/powerpc/boot/dcr.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

I chose to use a #define to keep with the style of m[tf]dcr in the same file.

diff --git a/arch/powerpc/boot/dcr.h b/arch/powerpc/boot/dcr.h
index 645a7c9..cc73f7a 100644
--- a/arch/powerpc/boot/dcr.h
+++ b/arch/powerpc/boot/dcr.h
@@ -9,6 +9,12 @@
 	})
 #define mtdcr(rn, val) \
 	asm volatile("mtdcr %0,%1" : : "i"(rn), "r"(val))
+#define mfdcrx(rn) \
+	({	\
+		unsigned long rval; \
+		asm volatile("mfdcrx %0,%1" : "=r"(rval) : "r"(rn)); \
+		rval; \
+	})
 
 /* 440GP/440GX SDRAM controller DCRs */
 #define DCRN_SDRAM0_CFGADDR				0x010
-- 
1.7.6.4