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lib: utils/ipi: Add Andes fdt ipi driver support

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Move Andes PLICSW ipi device to fdt ipi framework, this patch is based
on Leo's modified IPI scheme on PLICSW.

Current IPI scheme uses bit 0 of pending reigster on PLICSW to send IPI
from hart 0 to hart 7, but bit 0 needs to be hardwired to 0 according
to spec. After some investigation, self-IPI seems to be seldom or never
used, so we re-order the IPI scheme to support 8 core platforms.

dts example (Quad-core AX45MP):

  plicsw: interrupt-controller@e6400000 {
          compatible = "andestech,plicsw";
          reg = <0x00000000 0xe6400000 0x00000000 0x00400000>;
          interrupts-extended = <&CPU0_intc 3
                                 &CPU1_intc 3
                                 &CPU2_intc 3
                                 &CPU3_intc 3>;
          interrupt-controller;
          #address-cells = <2>;
          #interrupt-cells = <2>;
  };

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yu Chien Peter Lin
2022-10-14 08:32:50 +08:00
committed by Anup Patel
parent 6f3258e671
commit ce7c490719
13 changed files with 305 additions and 211 deletions
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4
lib/utils/ipi/objects.mk
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@@ -8,9 +8,13 @@
#
libsbiutils-objs-$(CONFIG_IPI_MSWI) += ipi/aclint_mswi.o
libsbiutils-objs-$(CONFIG_IPI_PLICSW) += ipi/andes_plicsw.o
libsbiutils-objs-$(CONFIG_FDT_IPI) += ipi/fdt_ipi.o
libsbiutils-objs-$(CONFIG_FDT_IPI) += ipi/fdt_ipi_drivers.o
carray-fdt_ipi_drivers-$(CONFIG_FDT_IPI_MSWI) += fdt_ipi_mswi
libsbiutils-objs-$(CONFIG_FDT_IPI_MSWI) += ipi/fdt_ipi_mswi.o
carray-fdt_ipi_drivers-$(CONFIG_FDT_IPI_PLICSW) += fdt_ipi_plicsw
libsbiutils-objs-$(CONFIG_FDT_IPI_PLICSW) += ipi/fdt_ipi_plicsw.o