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| author | Paul Mackerras <paulus@ozlabs.org> | 2021-06-18 05:43:41 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-21 13:15:26 +0200 |
| commit | 53d143fe08c24c2ce44ee329e41c2a6aad57ebb5 (patch) | |
| tree | e111b8fcf66124edf4d0541cc4bc09411fcb8e90 /arch/powerpc/platforms/microwatt | |
| parent | powerpc/32: use set_memory_attr() (diff) | |
| download | linux-53d143fe08c24c2ce44ee329e41c2a6aad57ebb5.tar.xz linux-53d143fe08c24c2ce44ee329e41c2a6aad57ebb5.zip | |
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 <paulus@ozlabs.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/YMwWbZVREsVug9R0@thinks.paulus.ozlabs.org
Diffstat (limited to 'arch/powerpc/platforms/microwatt')
| -rw-r--r-- | arch/powerpc/platforms/microwatt/Kconfig | 9 | ||||
| -rw-r--r-- | arch/powerpc/platforms/microwatt/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/microwatt/setup.c | 23 |
3 files changed, 33 insertions, 0 deletions
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 <linux/types.h> +#include <linux/kernel.h> +#include <linux/stddef.h> +#include <linux/init.h> +#include <asm/machdep.h> +#include <asm/time.h> + +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, +}; |