[PATCH 1/4] powerpc/powernv: Add OPAL check token call

[Michael Neuling]

On Mon, 2014-09-15 at 13:10 +1000, Michael Ellerman wrote:
> On Tue, 2014-08-19 at 14:47 +1000, Michael Neuling wrote:
> > Currently there is no way to generically check if an OPAL call exists or not
> > from the host kernel.
> > 
> > This adds an OPAL call opal_check_token() which tells you if the given token is
> > present in OPAL or not.
> > 
> > Signed-off-by: Michael Neuling <mikey at neuling.org>
> > ---
> >  arch/powerpc/include/asm/opal.h                | 7 +++++++
> >  arch/powerpc/platforms/powernv/opal-wrappers.S | 1 +
> >  2 files changed, 8 insertions(+)
> > 
> > diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
> > index 86055e5..4593a93 100644
> > --- a/arch/powerpc/include/asm/opal.h
> > +++ b/arch/powerpc/include/asm/opal.h
> > @@ -135,6 +135,7 @@ struct opal_sg_list {
> >  #define OPAL_FLASH_MANAGE			77
> >  #define OPAL_FLASH_UPDATE			78
> >  #define OPAL_RESYNC_TIMEBASE			79
> > +#define OPAL_CHECK_TOKEN			80
> >  #define OPAL_DUMP_INIT				81
> >  #define OPAL_DUMP_INFO				82
> >  #define OPAL_DUMP_READ				83
> > @@ -417,6 +418,11 @@ struct opal_msg {
> >  	__be64 params[8];
> >  };
> >  
> > +enum OpalCheckTokenStatus {
> > +       OPAL_TOKEN_ABSENT = 0,
> > +       OPAL_TOKEN_PRESENT = 1
> > +};
> 
> I don't see this used anywhere?
> 
> And NoCamelCase !

We can probably just delete the enum since we are just doing this in
code anyway:

       if (!opal_check_token(OPAL_RTC_READ))
               goto out;

OK?  Or would you prefer the usage to read:

       if (opal_check_token(OPAL_RTC_READ) == OPAL_TOKEN_ABSENT)
               goto out;


> Yes I know there's lots in that file, but I didn't merge that :)

Fickle bloody maintainers.  I thought I never say this but... I want our
crazy Frenchman back! :-P

Mikey