[PATCH v3 0/5] Firmware-assisted suspend/resume of Exynos SoCs

From: Tomasz Figa
Date: Tue Aug 26 2014 - 10:12:44 EST

On Exynos-based boards running secure firmware the sequence of low level
operations to enter and leave system-wide sleep mode is different than
on those without the firmware. Namely:
- CP15 power control and diagnostic registers cannot be written directly,
- the way of setting boot address and boot flag is different,
- different resume handler needs to be used,
- dedicated SMC call needs to be performed instead of letting the CPU enter

This series introduces .suspend() and .resume() firmware operations to
perform low level firmware-specific suspend and resume and then leverages
them to provide suspend-resume path meeting the above requirements. Three
additional patches extend device tree sources of Trats2 board with necessary
setup to enable suspend/resume support.

This series has been tested on Exynos4412-based Trats2 board, without any
additional patches. Unfortunately v3.17-rc1 regressed ODROID support and
suspend stopped working on those boards, due to unknown reasons still being
investigated. It does not seem to be related to anything in this series,
though, so I would not consider this as a stopper.

Changes since v2:
- added board-specific fixes for device tree sources of Trats2 board,
- rebased on next-20140826 of linux-next tree.

Changes since v1:
- dropped outer_resume() - will be handled in assembly in further patches,
as support for L2C in non-secure mode gets added,
- moved CP15 resume to assembly as it needs to be done before MMU is enabled,
- surrounded CP15 save with a check for cpuid part, because it is valid only
on Cortex A9,
- rebased on next-20140717 tag of linux-next tree.

Tomasz Figa (5):
ARM: firmware: Introduce suspend and resume operations
ARM: EXYNOS: Add support for firmware-assisted suspend/resume
ARM: dts: exynos4412-trats2: Keep eMMC regulators soft-disabled
ARM: dts: exynos4x12: Add utility macro to define pin sleep states
ARM: dts: exynos4412-trats2: Add sleep mode pin configuration

Documentation/arm/firmware.txt | 28 +--
arch/arm/boot/dts/exynos4412-trats2.dts | 320 +++++++++++++++++++++++++++++-
arch/arm/boot/dts/exynos4x12-pinctrl.dtsi | 16 ++
arch/arm/include/asm/firmware.h | 8 +
arch/arm/mach-exynos/Makefile | 1 +
arch/arm/mach-exynos/common.h | 4 +
arch/arm/mach-exynos/firmware.c | 45 +++++
arch/arm/mach-exynos/pm.c | 16 +-
arch/arm/mach-exynos/sleep.S | 28 +++
arch/arm/mach-exynos/smc.h | 4 +
10 files changed, 438 insertions(+), 32 deletions(-)


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