[PATCH v3] ARM: cache-l2x0: add resume entry for l2 in secure mode

[shawn.guo@freescale.com (Shawn Guo)]

On Fri, Sep 30, 2011 at 04:44:33PM +0800, Barry Song wrote:
> 2011/9/30 Shawn Guo <shawn.guo@freescale.com>:
> > On Thu, Sep 29, 2011 at 08:31:21PM -0700, Barry Song wrote:
> >> From: Barry Song <Baohua.Song@csr.com>
> >>
> >> we save the l2x0 registers at the first initialization, and platform codes
> >> can get them to restore l2x0 status after wakeup.
> >>
> >> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> >> Cc: Shawn Guo <shawn.guo@linaro.org>
> >> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> >> Signed-off-by: Barry Song <Baohua.Song@csr.com>
> >> ---
> >> ?-v3:
> >> ?save PREFETCH_CTRL and POWER_CTRL according to revision;
> >> ?save l2x0 physical address so that asm codes can use.
> >
> > On imx6q:
> >
> > Tested-by: Shawn Guo <shawn.guo@linaro.org>
> 
> Shawn, Thanks.
> 
> >
> > One minor comment below.
> >
> >>
> >> ?arch/arm/include/asm/hardware/cache-l2x0.h | ? 23 +++++
> >> ?arch/arm/include/asm/outercache.h ? ? ? ? ?| ? ?7 ++
> >> ?arch/arm/kernel/asm-offsets.c ? ? ? ? ? ? ?| ? 12 +++
> >> ?arch/arm/mm/cache-l2x0.c ? ? ? ? ? ? ? ? ? | ?129 +++++++++++++++++++++++++--
> >> ?4 files changed, 161 insertions(+), 10 deletions(-)
> >
> > [... ]
> >
> >> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> >> index 0d85d22..3f9b998 100644
> >> --- a/arch/arm/mm/cache-l2x0.c
> >> +++ b/arch/arm/mm/cache-l2x0.c
> >> @@ -33,6 +33,14 @@ static DEFINE_SPINLOCK(l2x0_lock);
> >> ?static uint32_t l2x0_way_mask; ? ? ? /* Bitmask of active ways */
> >> ?static uint32_t l2x0_size;
> >>
> >> +struct l2x0_regs l2x0_saved_regs;
> >> +
> > Can we add a declaration of l2x0_saved_regs in cache-l2x0.h, so that
> > platform code does not need to declare it individually?
> 
> it could be ok. if the platform codes are in c after MMU on, it can be
> useful.

Actually, it's needed for imx6q case (resume in asm) too, because we
need to save __pa(l2x0_saved_regs) in C for later use by asm.

> but people might be able to call outer_resume() in c directly.
> then it doesn't need the declaration as well.

We do not define l2x0_saved_regs as static for the only reason that
some platform codes need to access it.  Then we could add declaration
to ease platform code a little bit more.

-- 
Regards,
Shawn