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lib: utils/suspend: add Andes ATCSMU suspend driver

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Implement a system-wide suspend driver for the Andes AE350 platform.
This driver supports Andes-specific deep sleep (suspend to RAM) and
light sleep (suspend to standby) functionalities via the ATCSMU.

The major differences between deep sleep and light sleep are:

- Power Domain and Resume Path: Deep sleep powers down the core domain.
  Consequently, harts waking from deep sleep resume from the reset
  vector. Light sleep utilizes clock gating to the core domain; harts
  maintain state and resume execution at the instruction immediately
  following the WFI instruction.

- Primary Hart Wakeup: In both modes, the primary hart is woken by
  UART or RTC alarm interrupts. In deep sleep, the primary hart is
  additionally responsible for re-enabling the Last Level Cache (LLC)
  and restoring Andes-specific CSRs.

- Secondary Hart Wakeup: In light sleep, secondary harts are woken
  by an IPI sent from the primary hart. In deep sleep, they are
  woken by an ATCSMU hardware wake-up command. Furthermore,
  secondary harts must restore Andes-specific CSRs when returning
  from deep sleep.

Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
Signed-off-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Link: https://lore.kernel.org/r/20251229071914.1451587-6-ben717@andestech.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Ben Zong-You Xie
2025-12-29 15:19:14 +08:00
committed by Anup Patel
parent 82b0961821
commit b27ecec76b
7 changed files with 178 additions and 10 deletions
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3
lib/utils/suspend/objects.mk
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@@ -7,6 +7,9 @@
# Anup Patel <apatel@ventanamicro.com>
#
carray-fdt_early_drivers-$(CONFIG_FDT_SUSPEND_ANDES_ATCSMU) += fdt_suspend_andes_atcsmu
libsbiutils-objs-$(CONFIG_FDT_SUSPEND_ANDES_ATCSMU) += suspend/fdt_suspend_andes_atcsmu.o
carray-fdt_early_drivers-$(CONFIG_FDT_SUSPEND_RPMI) += fdt_suspend_rpmi
libsbiutils-objs-$(CONFIG_FDT_SUSPEND_RPMI) += suspend/fdt_suspend_rpmi.o