The sleep33xx and sleep43xx files should not depend on a header file
generated in drivers/memory. Remove this dependency and instead allow
both drivers/memory and arch/arm/mach-omap2 to generate all macros
needed in headers local to their own paths.
This fixes an issue where the build fail will when using O= to set a
split object directory and arch/arm/mach-omap2 is built before
drivers/memory with the following error:
.../drivers/memory/emif-asm-offsets.c:1:0: fatal error: can't open
drivers/memory/emif-asm-offsets.s for writing: No such file or directory
compilation terminated.
Fixes: 41d9d44d72 ("ARM: OMAP2+: pm33xx-core: Add platform code needed for PM")
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Most of the PM code needed for am335x and am437x can be moved into a
module under drivers but some core code must remain in mach-omap2 at the
moment. This includes some internal clockdomain APIs and low-level ARM
APIs which are also not exported for use by modules.
Implement a few functions that handle these low-level platform
operations can be passed to the pm33xx module through the use of
platform data.
In addition to this, to be able to share data structures between C and
the sleep33xx and sleep43xx assembly code, we can automatically generate
all of the C struct member offsets and sizes as macros by processing
pm-asm-offsets.c into assembly code and then extracting the relevant
data as is done for the generated platform asm-offsets.h files.
Finally, add amx3_common_pm_init to create a dummy platform_device for
pm33xx so that our soon to be introduced pm33xx module can probe on
am335x and am437x platforms to enable basic suspend to mem and standby
support.
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
In preparation for suspend-resume support for AM33XX, add
the assembly file with the code which is copied to internal
memory (OCMC RAM) during bootup and runs from there.
As part of the low power entry (DeepSleep0 mode in AM33XX TRM),
the code running from OCMC RAM does the following
1. Calls routine to store the EMIF configuration
2. Calls routine to place external memory in self-refresh
3. Disables EMIF clock
4. Executes WFI after writing to MPU_CLKCTRL register.
If no interrupts have come, WFI execution on MPU gets registered
as an interrupt with the WKUP-M3. WKUP-M3 takes care of disabling
some clocks which MPU should not (L3, L4, OCMC RAM etc) and takes
care of clockdomain and powerdomain transitions as part of the
DeepSleep0 mode entry.
In case a late interrupt comes in, WFI ends up as a NOP and MPU
continues execution from internal memory. The 'abort path' code
undoes whatever was done as part of the low power entry and indicates
a suspend failure by passing a non-zero value to the cpu_resume routine.
The 'resume path' code is similar to the 'abort path' with the key
difference of MMU being enabled in the 'abort path' but being
disabled in the 'resume path' due to MPU getting powered off.
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Dave Gerlach