[PATCH] ppc64: cleanup iseries runlight support
The iseries has a bar graph on the front panel that shows how busy it is.
The operating system sets and clears a bit in the CTRL register to control
it.
Instead of going to the complexity of using a thread info bit, just set and
clear it in the idle loop.
Also create two helper functions, ppc64_runlatch_on and ppc64_runlatch_off.
Finally don't use the short form of the SPR defines.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/asm-ppc64/processor.h b/include/asm-ppc64/processor.h
index 5ba6aa4..809c634b 100644
--- a/include/asm-ppc64/processor.h
+++ b/include/asm-ppc64/processor.h
@@ -164,6 +164,9 @@
#define SPRN_USIA 0x3AB /* User Sampled Instruction Address Register */
#define SPRN_XER 0x001 /* Fixed Point Exception Register */
#define SPRN_VRSAVE 0x100 /* Vector save */
+#define SPRN_CTRLF 0x088
+#define SPRN_CTRLT 0x098
+#define CTRL_RUNLATCH 0x1
/* Performance monitor SPRs */
#define SPRN_SIAR 780
@@ -279,12 +282,6 @@
#define XGLUE(a,b) a##b
#define GLUE(a,b) XGLUE(a,b)
-/* iSeries CTRL register (for runlatch) */
-
-#define CTRLT 0x098
-#define CTRLF 0x088
-#define RUNLATCH 0x0001
-
#ifdef __ASSEMBLY__
#define _GLOBAL(name) \
@@ -499,6 +496,24 @@
#define HAVE_ARCH_PICK_MMAP_LAYOUT
+static inline void ppc64_runlatch_on(void)
+{
+ unsigned long ctrl;
+
+ ctrl = mfspr(SPRN_CTRLF);
+ ctrl |= CTRL_RUNLATCH;
+ mtspr(SPRN_CTRLT, ctrl);
+}
+
+static inline void ppc64_runlatch_off(void)
+{
+ unsigned long ctrl;
+
+ ctrl = mfspr(SPRN_CTRLF);
+ ctrl &= ~CTRL_RUNLATCH;
+ mtspr(SPRN_CTRLT, ctrl);
+}
+
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
