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 WFI.
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. The series is based on Kgene's for-next branch and tested on: - Exynos4412-based Trats2 board running in non-secure mode (under secure firmware) with few board-specific fixes that will be sent separately soon, - Exynos4210-based Trats board running in secure mode, - Exynos4412-based ODROID-U3 board running in non-secure mode with one minor board-specific fix which will be send shortly. Depends on: - [PATCH v3] ARM: save/restore Cortex-A9 CP15 registers on suspend/resume (http://www.spinics.net/lists/arm-kernel/msg346212.html) - [PATCH v3] ARM: EXYNOS: Fix suspend/resume sequences (https://lkml.org/lkml/2014/7/15/319) - [PATCH] ARM: make it easier to check the CPU part number correctly (http://thread.gmane.org/gmane.linux.ports.arm.kernel/335126 already in linux-next) 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 (2): ARM: firmware: Introduce suspend and resume operations ARM: EXYNOS: Add support for firmware-assisted suspend/resume Documentation/arm/firmware.txt | 28 +++++-------------------- 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 ++++ 8 files changed, 106 insertions(+), 28 deletions(-) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
