On Tue, Jul 31, 2012 at 09:15:33AM -0500, Kumar Gala wrote:
>
> On Jul 20, 2012, at 7:42 AM, Zhao Chenhui wrote:
>
> > In sleep PM mode, the clocks of e500 core and unused IP blocks is
> > turned off. IP blocks which are allowed to wake up the processor
> > are still running.
> >
> > Some Freescale chips like MPC8536 and P1022 has deep sleep PM mode
> > in addtion to the sleep PM mode.
> >
> > While in deep sleep PM mode, additionally, the power supply is
> > removed from e500 core and most IP blocks. Only the blocks needed
> > to wake up the chip out of deep sleep are ON.
> >
> > This patch supports 32-bit and 36-bit address space.
> >
> > The sleep mode is equal to the Standby state in Linux. The deep sleep
> > mode is equal to the Suspend-to-RAM state of Linux Power Management.
> >
> > Command to enter sleep mode.
> > echo standby > /sys/power/state
> > Command to enter deep sleep mode.
> > echo mem > /sys/power/state
> >
> > Signed-off-by: Dave Liu <[email protected]>
> > Signed-off-by: Li Yang <[email protected]>
> > Signed-off-by: Jin Qing <[email protected]>
> > Signed-off-by: Jerry Huang <[email protected]>
> > Cc: Scott Wood <[email protected]>
> > Signed-off-by: Zhao Chenhui <[email protected]>
> > ---
> > arch/powerpc/Kconfig | 2 +-
> > arch/powerpc/include/asm/cacheflush.h | 2 +
> > arch/powerpc/kernel/Makefile | 3 +
> > arch/powerpc/kernel/l2cache_85xx.S | 56 +++
> > arch/powerpc/platforms/85xx/Makefile | 2 +-
> > arch/powerpc/platforms/85xx/sleep.S | 621 +++++++++++++++++++++++++++++++++
> > arch/powerpc/sysdev/fsl_pmc.c | 98 +++++-
> > arch/powerpc/sysdev/fsl_soc.h | 5 +
> > 8 files changed, 769 insertions(+), 20 deletions(-)
> > create mode 100644 arch/powerpc/kernel/l2cache_85xx.S
> > create mode 100644 arch/powerpc/platforms/85xx/sleep.S
> >
> > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> > index a7c6914..9d6de82 100644
> > --- a/arch/powerpc/Kconfig
> > +++ b/arch/powerpc/Kconfig
> > @@ -665,7 +665,7 @@ config FSL_PCI
> > config FSL_PMC
> > bool
> > default y
> > - depends on SUSPEND && (PPC_85xx || PPC_86xx)
> > + depends on SUSPEND && (PPC_85xx || PPC_86xx) && !PPC_E500MC
> > help
> > Freescale MPC85xx/MPC86xx power management controller support
> > (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
> > diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
> > index b843e35..6c5f1c2 100644
> > --- a/arch/powerpc/include/asm/cacheflush.h
> > +++ b/arch/powerpc/include/asm/cacheflush.h
> > @@ -58,6 +58,8 @@ extern void flush_inval_dcache_range(unsigned long start, unsigned long stop);
> > extern void flush_dcache_phys_range(unsigned long start, unsigned long stop);
> > #endif
> >
> > +extern void flush_dcache_L1(void);
> > +
> > #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
> > do { \
> > memcpy(dst, src, len); \
> > diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
> > index 83afacd..0ddef24 100644
> > --- a/arch/powerpc/kernel/Makefile
> > +++ b/arch/powerpc/kernel/Makefile
> > @@ -64,6 +64,9 @@ obj-$(CONFIG_FA_DUMP) += fadump.o
> > ifeq ($(CONFIG_PPC32),y)
> > obj-$(CONFIG_E500) += idle_e500.o
> > endif
> > +ifneq ($(CONFIG_PPC_E500MC),y)
> > +obj-$(CONFIG_PPC_85xx) += l2cache_85xx.o
> > +endif
>
> why do we need this, beyond reduce code size on an e500mc kernel build? If so why isn't 85xx/sleep.S doing the same thing?
> - k
>
Yes, it is a little awkward. I have an idea to put e500/e500mc/e5500/e6500 related flush cache routines
into this file, and rename it to cache_fsl_booke.S.
As for 85xx/sleep.S, it is used by fsl_pmc.c. I will use CONFIG_FSL_PMC to guard it.
-Chenhui