Commit graph

5 commits

Author SHA1 Message Date
Elad Kanfi 3f9cd874dc ARC: [plat-eznps] avoid toggling of DPC register
HW bug description: in case of HW thread context switch
the dpc configuration of the exiting thread is dragged
one cycle into the next thread.
In order to avoid the consequences of this bug, the DPC register
is set to an initial value, and not changed afterwards.

Signed-off-by: Elad Kanfi <eladkan@mellanox.com>
Signed-off-by: Noam Camus <noamca@mellanox.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2017-08-28 15:17:36 -07:00
Noam Camus 644fa02b39 ARC: [plat-eznps] use schd.wft instruction instead of sleep at idle task
When HW threads are active we want CPU to enter idle state only
for the calling HW thread and not to put on sleep all HW threads
sharing this core. For this need the NPS400 got dedicated instruction
so only calling thread is entring sleep and all other are still awake
and can execute instructions.

Signed-off-by: Noam Camus <noamca@mellanox.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: reworked patch to not use inline ifdef but a new function itself]
2017-08-28 15:17:36 -07:00
Noam Camus 09dcd1958b soc: Support for NPS HW scheduling
This new header file is for NPS400 SoC (part of ARC architecture).
The header file includes macros for save/restore of HW scheduling.
The control of HW scheduling is achieved by writing core registers.
This code was moved from arc/plat-eznps so it can be used
from drivers/clocksource/, available only for CONFIG_EZNPS_MTM_EXT.

Signed-off-by: Noam Camus <noamca@mellanox.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2016-11-30 11:54:25 -08:00
Noam Camus 86c25466f7 ARC: [plat-eznps] Use dedicated identity auxiliary register.
With generic "identity" num of CPUs is limited to 256 (8 bit).
We use our alternative AUX register GLOBAL_ID (12 bit).
Now we can support up to 4096 CPUs.

Signed-off-by: Noam Camus <noamc@ezchip.com>
2016-05-09 09:32:33 +05:30
Noam Camus 4a66d3fecf ARC: [plat-eznps] Add eznps platform
This platform include boards:
	Hardware Emulator (HE)
	Simulator based upon nSIM.

Signed-off-by: Noam Camus <noamc@ezchip.com>
2016-05-09 09:32:32 +05:30