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* powerpc: Make generic_calibrate_decr() the defaultChristophe Leroy2023-03-161-1/+0
| | | | | | | | | | | | | | | ppc_md.calibrate_decr() is a mandatory item. Its nullity is never checked so it must be non null on all platforms. Most platforms define generic_calibrate_decr() as their ppc_md.calibrate_decr(). Have time_init() call generic_calibrate_decr() when ppc_md.calibrate_decr() is NULL, and remove default assignment from all machines. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/6cb9865d916231c38401ba34ad1a98c249fae135.1676711562.git.christophe.leroy@csgroup.eu
* powerpc/platforms: Use 'compatible' property for simple casesChristophe Leroy2023-03-151-6/+1
| | | | | | | | | | | | | Use the new 'compatible' property for simple cases. checkpatch complains about the new compatible being undocumented but in reality nothing is new so just ignore it for the time being. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/6cb9865d916231c38401ba34ad1a98c249fae135.1676711562.git.christophe.leroy@csgroup.eu
* random: remove CONFIG_ARCH_RANDOMJason A. Donenfeld2022-07-181-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When RDRAND was introduced, there was much discussion on whether it should be trusted and how the kernel should handle that. Initially, two mechanisms cropped up, CONFIG_ARCH_RANDOM, a compile time switch, and "nordrand", a boot-time switch. Later the thinking evolved. With a properly designed RNG, using RDRAND values alone won't harm anything, even if the outputs are malicious. Rather, the issue is whether those values are being *trusted* to be good or not. And so a new set of options were introduced as the real ones that people use -- CONFIG_RANDOM_TRUST_CPU and "random.trust_cpu". With these options, RDRAND is used, but it's not always credited. So in the worst case, it does nothing, and in the best case, maybe it helps. Along the way, CONFIG_ARCH_RANDOM's meaning got sort of pulled into the center and became something certain platforms force-select. The old options don't really help with much, and it's a bit odd to have special handling for these instructions when the kernel can deal fine with the existence or untrusted existence or broken existence or non-existence of that CPU capability. Simplify the situation by removing CONFIG_ARCH_RANDOM and using the ordinary asm-generic fallback pattern instead, keeping the two options that are actually used. For now it leaves "nordrand" for now, as the removal of that will take a different route. Acked-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Borislav Petkov <bp@suse.de> Acked-by: Heiko Carstens <hca@linux.ibm.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
* powerpc/microwatt: wire up rng during setup_arch()Jason A. Donenfeld2022-06-183-7/+18
| | | | | | | | | | | | | | | | | The platform's RNG must be available before random_init() in order to be useful for initial seeding, which in turn means that it needs to be called from setup_arch(), rather than from an init call. Fortunately, each platform already has a setup_arch function pointer, which means it's easy to wire this up. This commit also removes some noisy log messages that don't add much. Fixes: c25769fddaec ("powerpc/microwatt: Add support for hardware random number generator") Cc: stable@vger.kernel.org # v5.14+ Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220611151015.548325-2-Jason@zx2c4.com
* powerpc/microwatt: add POWER9_CPU, clear PPC_64S_HASH_MMUNicholas Piggin2021-12-091-1/+0
| | | | | | | | | | | | | Microwatt implements a subset of ISA v3.0 (which is equivalent to the POWER9_CPU option). It is radix-only, so does not require hash MMU support. This saves 20kB compressed dtbImage and 56kB vmlinux size. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211201144153.2456614-19-npiggin@gmail.com
* powerpc/64s: Make hash MMU support configurableNicholas Piggin2021-12-091-1/+1
| | | | | | | | | | | This adds Kconfig selection which allows 64s hash MMU support to be disabled. It can be disabled if radix support is enabled, the minimum supported CPU type is POWER9 (or higher), and KVM is not selected. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211201144153.2456614-17-npiggin@gmail.com
* powerpc: Rename PPC_NATIVE to PPC_HASH_MMU_NATIVENicholas Piggin2021-12-021-1/+1
| | | | | | | | | | PPC_NATIVE now only controls the native HPT code, so rename it to be more descriptive. Restrict it to Book3S only. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211201144153.2456614-3-npiggin@gmail.com
* powerpc/microwatt: Make microwatt_get_random_darn() staticMichael Ellerman2021-11-251-1/+1
| | | | | | | | | | Make microwatt_get_random_darn() static, because it can be. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211118004415.1706863-1-mpe@ellerman.id.au
* powerpc/microwatt: Add support for hardware random number generatorPaul Mackerras2021-06-213-1/+50
| | | | | | | | | | | Microwatt's hardware RNG is accessed using the DARN instruction. 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/YMwXPHlV/ZleiQUY@thinks.paulus.ozlabs.org
* powerpc/microwatt: Use standard 16550 UART for consoleBenjamin Herrenschmidt2021-06-212-0/+3
| | | | | | | | | | | | This adds support to the Microwatt platform to use the standard 16550-style UART which available in the standalone Microwatt FPGA. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/YMwXGCTzedpQje7r@thinks.paulus.ozlabs.org
* powerpc/xics: Add a native ICS backend for microwattBenjamin Herrenschmidt2021-06-212-0/+10
| | | | | | | | | | | | | | This is a simple native ICS backend that matches the layout of the Microwatt implementation of ICS. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org> [mpe: Add empty ics_native_init() to unbreak non-microwatt builds] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> fixup-ics Link: https://lore.kernel.org/r/YMwW8cxrwB2W5EUN@thinks.paulus.ozlabs.org
* powerpc/microwatt: Populate platform bus from device-treeBenjamin Herrenschmidt2021-06-211-0/+8
| | | | | | | | | | | | | Just like any other embedded platform. Add an empty soc node. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/YMwWx98+PMibZq/G@thinks.paulus.ozlabs.org
* powerpc: Add Microwatt platformPaul Mackerras2021-06-213-0/+33
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
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