On 11/10/2017 8:39 AM, Russell King - ARM Linux wrote:
On Mon, Oct 16, 2017 at 08:31:59AM -0700, Santosh Shilimkar wrote:
Hi Russell,
On 10/13/2017 1:59 PM, Dave Gerlach wrote:
Certain SoCs like Texas Instruments AM335x and AM437x require parts
of the EMIF PM code to run late in the suspend sequence from SRAM,
such as saving and restoring the EMIF context and placing the memory
into self-refresh.
One requirement for these SoCs to suspend and enter its lowest power
mode, called DeepSleep0, is that the PER power domain must be shut off.
Because the EMIF (DDR Controller) resides within this power domain, it
will lose context during a suspend operation, so we must save it so we
can restore once we resume. However, we cannot execute this code from
external memory, as it is not available at this point, so the code must
be executed late in the suspend path from SRAM.
This patch introduces a ti-emif-sram driver that includes several
functions written in ARM ASM that are relocatable so the PM SRAM
code can use them. It also allocates a region of writable SRAM to
be used by the code running in the executable region of SRAM to save
and restore the EMIF context. It can export a table containing the
absolute addresses of the available PM functions so that other SRAM
code can branch to them. This code is required for suspend/resume on
AM335x and AM437x to work.
In addition to this, to be able to share data structures between C and
the ti-emif-sram-pm assembly code, we can automatically generate all of
the C struct member offsets and sizes as macros by processing
emif-asm-offsets.c into assembly code and then extracting the relevant
data as is done for the generated platform asm-offsets.h files.
Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
---
v4->v5:
* Simplify Makefile to generate include/generated/ti-emif-asm-offsets.h
If you are happy with this version from Dave, can I get your ack please?
I can add this to the driver-soc then.
Does it need my ack anymore? It doesn't touch anything in arch/arm.
If you still want it, then... notwithstanding the loss of type checking
that fncpy() gave and the new sram stuff messes up...
Acked-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Thanks Russell !!
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