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2018-09-16power: reset: at91-poweroff: switch to slow clock before shutdownClaudiu Beznea1-0/+8
The SAMA5D2 NRST input signal is resynchronized with the SLCK clock and it can take up to 2 SLCK cycles (about 90us) for the internal reset to be effective. During this delay, the VDDCORE current consumption may still be high (application-dependent) with the VDDCORE regulator already OFF. Under such conditions, VDDCORE may operate below its operating range leading to potential register corruption. To prevent such situation, it is recommended to decrease significantly the power consumption of the device once the voltage regulator is turned-off. This can be achieved by operating the device at a much lower low frequency. To solve this switch the master clock to slock clock just before writing shutdown command to shutdown controller. Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Suggested-by: Patrice Vilchez <patrice.vilchez@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2018-07-17ARM: at91: pm: Add ULP1 mode supportWenyou Yang1-20/+122
In the ULP1 mode, in order to achieve the lowest power consumption with the system in retention mode and be able to resume on the wake up events, all the clocks are shut off, inclusive the embedded 12MHz RC oscillator, and the number of wake up sources is limited as well. When the wake up event is asserted, the embedded 12MHz RC oscillator restarts automatically. The ULP1 (Ultra Low-power mode 1) is introduced by SAMA5D2. The previous size of pm_suspend.o was 2148 bytes. With the addition of ULP1 mode the new size of pm_suspend.o raised at 2456 bytes. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com> [claudiu.beznea@microchip.com: aligned with 4.18-rc1] Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-07-17ARM: at91: pm: Use ULP0 naming instead of slow clockClaudiu Beznea1-6/+6
Switch to use ULP0 naming instead of slow clock naming for power modes, to be as closed as possible to datasheet. This commit does the necessary renaming and macro addition to be as close as possible to the namings from [1]. [1] https://lore.kernel.org/lkml/1470650705-31418-3-git-send-email-wenyou.yang@atmel.com Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2017-05-15ARM: at91: pm: Add sama5d2 backup modeAlexandre Belloni1-19/+54
The sama5d2 has a mode were it is possible to cut power to the SoC while keeping the RAM in self refresh. Resuming from that mode needs support in the firmware/bootloader. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Wenyou Yang <wenyou.yang@atmel.com>
2017-03-31ARM: at91: pm: correct typoAlexandre Belloni1-1/+1
Add a missing bracket at the end of Anti's email Acked-by: Wenyou Yang <wenyou.yang@atmel.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-03-31ARM: at91: pm: Use struct at91_pm_data in pm_suspend.SAlexandre Belloni1-16/+13
The number of register we can safely pass to at91_pm_suspend_in_sram is limited. Instead, pass the address to the at91_pm_data structure. The offsets are automatically generated to avoid hardcoding them. Acked-by: Wenyou Yang <wenyou.yang@atmel.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-10-19ARM: at91: pm: at91_pm_suspend_in_sram() must be 8-byte alignedPatrick Doyle1-0/+2
fncpy() requires that the source and the destination are both 8-byte aligned. Signed-off-by: Patrick Doyle <pdoyle@irobot.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Fixes: d94e688cae56 ("ARM: at91/pm: move the copying the sram function to the sram initialization phase") Cc: <stable@vger.kernel.org> # 4.1+
2015-05-20ARM: at91: remove mach/at91_ramc.h and mach/at91rm9200_mc.hAlexandre Belloni1-1/+0
mach/at91_ramc.h and mach/at91rm9200_mc.h aren't necessary anymore, remove them. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2015-05-20ARM: at91/pm: use the atmel-mc syscon definesAlexandre Belloni1-1/+1
Use the defines from atmel-mc.h instead of at91rm9200_sdramc.h Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2015-03-19ARM: at91: remove hardware.hAlexandre Belloni1-1/+0
hardware.h is now mostyl unused, move the remaining declarations to pm.c and remove it. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2015-03-13ARM: at91/pm_suspend: add the WFI instruction support for ARMv7Wenyou Yang1-1/+19
Add the WFI instruction to make the cpu to the idle state. In the meanwhile, disable the processor's clock. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Tested-by: Sylvain Rochet <sylvain.rochet@finsecur.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2015-03-13ARM: at91/pm: rename function name: at91_slow_clock() --> at91_pm_suspend_sram_fn()Wenyou Yang1-15/+11
As the file name is renamed, rename the function name at91_slow_clock() --> at91_pm_suspend_sram_fn(), rename the function handler's name at the same time. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Tested-by: Sylvain Rochet <sylvain.rochet@finsecur.com> [nicolas.ferre@atmel.com: little update of the commit message] Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2015-03-13ARM: at91/pm: rename file name: pm_slowclock.S --> pm_suspend.SWenyou Yang1-0/+324
Because the sram function is used for both suspend to memory and the suspend to standby mode, renaming is more elegant. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Tested-by: Sylvain Rochet <sylvain.rochet@finsecur.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
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