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[6/8] powerpc/boot: Add mfdcrx

Message ID 1322725164-4391-7-git-send-email-tony@bakeyournoodle.com (mailing list archive)
State Accepted, archived
Commit 075bcf5879225d0c2a119c23d8046b890e051e81
Delegated to: Josh Boyer
Headers show

Commit Message

Tony Breeds Dec. 1, 2011, 7:39 a.m. UTC
Needed for currituck support.

Signed-off-by: Tony Breeds <tony@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.
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Patch

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