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[PATCH] ppc64: cleanup iseries runlight support

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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>
This commit is contained in:
Anton Blanchard 2005-06-02 14:02:02 -07:00 • committed by Linus Torvalds
parent 79f1248962
commit 6dc2f0c7df
7 changed files with 33 additions and 36 deletions
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27
include/asm-ppc64/processor.h
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@ -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 @@ static inline void prefetchw(const void *x)
#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__ */