From 53d143fe08c24c2ce44ee329e41c2a6aad57ebb5 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Fri, 18 Jun 2021 13:43:41 +1000 Subject: powerpc: Add Microwatt platform Microwatt is a FPGA-based implementation of the Power ISA. It currently only implements little-endian 64-bit mode, and does not (yet) support SMP, VMX, VSX or transactional memory. It has an optional FPU, and an optional MMU (required for running Linux, obviously) which implements a configurable radix tree but not hypervisor mode or nested radix translation. This adds a new machine type to support FPGA-based SoCs with a Microwatt core. CONFIG_MATH_EMULATION can be selected for Microwatt SOCs which don't have the FPU. Signed-off-by: Paul Mackerras Reviewed-by: Nicholas Piggin Reviewed-by: Segher Boessenkool Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/YMwWbZVREsVug9R0@thinks.paulus.ozlabs.org --- arch/powerpc/Kconfig | 2 +- arch/powerpc/platforms/Kconfig | 1 + arch/powerpc/platforms/Makefile | 1 + arch/powerpc/platforms/microwatt/Kconfig | 9 +++++++++ arch/powerpc/platforms/microwatt/Makefile | 1 + arch/powerpc/platforms/microwatt/setup.c | 23 +++++++++++++++++++++++ 6 files changed, 36 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/platforms/microwatt/Kconfig create mode 100644 arch/powerpc/platforms/microwatt/Makefile create mode 100644 arch/powerpc/platforms/microwatt/setup.c (limited to 'arch/powerpc') diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 72f307f1796b..9bf52e292eda 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -430,7 +430,7 @@ source "kernel/Kconfig.hz" config MATH_EMULATION bool "Math emulation" - depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE + depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT select PPC_FPU_REGS help Some PowerPC chips designed for embedded applications do not have diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig index 594544a65b02..2f071fb9694c 100644 --- a/arch/powerpc/platforms/Kconfig +++ b/arch/powerpc/platforms/Kconfig @@ -21,6 +21,7 @@ source "arch/powerpc/platforms/44x/Kconfig" source "arch/powerpc/platforms/40x/Kconfig" source "arch/powerpc/platforms/amigaone/Kconfig" source "arch/powerpc/platforms/book3s/Kconfig" +source "arch/powerpc/platforms/microwatt/Kconfig" config KVM_GUEST bool "KVM Guest support" diff --git a/arch/powerpc/platforms/Makefile b/arch/powerpc/platforms/Makefile index 0e75d7df387b..94470fb27c99 100644 --- a/arch/powerpc/platforms/Makefile +++ b/arch/powerpc/platforms/Makefile @@ -23,3 +23,4 @@ obj-$(CONFIG_PPC_PS3) += ps3/ obj-$(CONFIG_EMBEDDED6xx) += embedded6xx/ obj-$(CONFIG_AMIGAONE) += amigaone/ obj-$(CONFIG_PPC_BOOK3S) += book3s/ +obj-$(CONFIG_PPC_MICROWATT) += microwatt/ diff --git a/arch/powerpc/platforms/microwatt/Kconfig b/arch/powerpc/platforms/microwatt/Kconfig new file mode 100644 index 000000000000..3be01e78ce57 --- /dev/null +++ b/arch/powerpc/platforms/microwatt/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 +config PPC_MICROWATT + depends on PPC_BOOK3S_64 && !SMP + bool "Microwatt SoC platform" + select PPC_XICS + select PPC_NATIVE + help + This option enables support for FPGA-based Microwatt implementations. + diff --git a/arch/powerpc/platforms/microwatt/Makefile b/arch/powerpc/platforms/microwatt/Makefile new file mode 100644 index 000000000000..e6885b3b2ee7 --- /dev/null +++ b/arch/powerpc/platforms/microwatt/Makefile @@ -0,0 +1 @@ +obj-y += setup.o diff --git a/arch/powerpc/platforms/microwatt/setup.c b/arch/powerpc/platforms/microwatt/setup.c new file mode 100644 index 000000000000..d80d52612672 --- /dev/null +++ b/arch/powerpc/platforms/microwatt/setup.c @@ -0,0 +1,23 @@ +/* + * Microwatt FPGA-based SoC platform setup code. + * + * Copyright 2020 Paul Mackerras (paulus@ozlabs.org), IBM Corp. + */ + +#include +#include +#include +#include +#include +#include + +static int __init microwatt_probe(void) +{ + return of_machine_is_compatible("microwatt-soc"); +} + +define_machine(microwatt) { + .name = "microwatt", + .probe = microwatt_probe, + .calibrate_decr = generic_calibrate_decr, +}; -- cgit v1.2.3