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linux-stable/arch/m68k/Kconfig.cpu
Arnd Bergmann 4760df6c17 m68k: Select M68020 as fallback for classic 
Building without a CPU selected does not work.

Change the Kconfig logic slightly to make sure we always pick M68020 if
nothing else is enabled.  There are still some intentional warnings for
builds with all platforms disabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/20241030195638.22542-2-arnd@kernel.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2024-11-06 15:10:14 +01:00

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# SPDX-License-Identifier: GPL-2.0
comment "Processor Type"
choice
prompt "CPU/machine family support"
default M68KCLASSIC if MMU
default COLDFIRE if !MMU
help
The Freescale (was Motorola) M68K family of processors implements
the full 68000 processor instruction set.
The Freescale ColdFire family of processors is a modern derivative
of the 68000 processor family. They are mainly targeted at embedded
applications, and are all System-On-Chip (SOC) devices, as opposed
to stand alone CPUs. They implement a subset of the original 68000
processor instruction set.
If you anticipate running this kernel on a computer with a classic
MC68xxx processor, select M68KCLASSIC.
If you anticipate running this kernel on a computer with a ColdFire
processor, select COLDFIRE.
config M68KCLASSIC
bool "Classic M68K CPU/machine family support"
select HAVE_ARCH_PFN_VALID
select M68020 if MMU && !(M68030 || M68040 || M68060)
config COLDFIRE
bool "Coldfire CPU family support"
select CPU_HAS_NO_BITFIELDS
select CPU_HAS_NO_CAS
select CPU_HAS_NO_MULDIV64
select GENERIC_CSUM
select GPIOLIB
select HAVE_LEGACY_CLK
select HAVE_PAGE_SIZE_8KB if !MMU
config SUN3
bool "Sun3 machine support"
depends on MMU
select HAVE_ARCH_PFN_VALID
select LEGACY_TIMER_TICK
select NO_DMA
select M68020
help
This option enables support for the Sun 3 series of workstations
(3/50, 3/60, 3/1xx, 3/2xx systems). These use a classic 68020 CPU
but the custom memory management unit makes them incompatible with
all other classic m68k machines, including Sun 3x.
endchoice
config M68000
def_bool M68KCLASSIC && !MMU
select CPU_HAS_NO_BITFIELDS
select CPU_HAS_NO_CAS
select CPU_HAS_NO_MULDIV64
select CPU_HAS_NO_UNALIGNED
select GENERIC_CSUM
select CPU_NO_EFFICIENT_FFS
select HAVE_ARCH_HASH
select HAVE_PAGE_SIZE_4KB
select LEGACY_TIMER_TICK
help
The Freescale (was Motorola) 68000 CPU is the first generation of
the well known M68K family of processors. The CPU core as well as
being available as a stand alone CPU was also used in many
System-On-Chip devices (eg 68328, 68302, etc). It does not contain
a paging MMU.
config M68020
bool "68020 support" if M68KCLASSIC
depends on MMU
select FPU
select CPU_HAS_ADDRESS_SPACES
help
If you anticipate running this kernel on a computer with a MC68020
processor, say Y. Otherwise, say N. Note that the 68020 requires a
68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
Sun 3, which provides its own version.
if M68KCLASSIC && MMU
config M68030
bool "68030 support"
select FPU
select CPU_HAS_ADDRESS_SPACES
help
If you anticipate running this kernel on a computer with a MC68030
processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
work, as it does not include an MMU (Memory Management Unit).
config M68040
bool "68040 support"
select FPU
select CPU_HAS_ADDRESS_SPACES
help
If you anticipate running this kernel on a computer with a MC68LC040
or MC68040 processor, say Y. Otherwise, say N. Note that an
MC68EC040 will not work, as it does not include an MMU (Memory
Management Unit).
config M68060
bool "68060 support"
select FPU
select CPU_HAS_ADDRESS_SPACES
help
If you anticipate running this kernel on a computer with a MC68060
processor, say Y. Otherwise, say N.
endif # M68KCLASSIC
config M68328
bool
depends on !MMU
select M68000
help
Motorola 68328 processor support.
config M68EZ328
bool
depends on !MMU
select M68000
help
Motorola 68EX328 processor support.
config M68VZ328
bool
depends on !MMU
select M68000
help
Motorola 68VZ328 processor support.
if COLDFIRE
choice
prompt "ColdFire SoC type"
default M520x
help
Select the type of ColdFire System-on-Chip (SoC) that you want
to build for.
config M5206
bool "MCF5206"
depends on !MMU
select COLDFIRE_SW_A7
select COLDFIRE_TIMERS
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Motorola ColdFire 5206 processor support.
config M5206e
bool "MCF5206e"
depends on !MMU
select COLDFIRE_SW_A7
select COLDFIRE_TIMERS
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Motorola ColdFire 5206e processor support.
config M520x
bool "MCF520x"
depends on !MMU
select COLDFIRE_PIT_TIMER
select HAVE_CACHE_SPLIT
help
Freescale Coldfire 5207/5208 processor support.
config M523x
bool "MCF523x"
depends on !MMU
select COLDFIRE_PIT_TIMER
select HAVE_CACHE_SPLIT
select HAVE_IPSBAR
help
Freescale Coldfire 5230/1/2/4/5 processor support
config M5249
bool "MCF5249"
depends on !MMU
select COLDFIRE_SW_A7
select COLDFIRE_TIMERS
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Motorola ColdFire 5249 processor support.
config M525x
bool "MCF525x"
depends on !MMU
select COLDFIRE_SW_A7
select COLDFIRE_TIMERS
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Freescale (Motorola) Coldfire 5251/5253 processor support.
config M5271
bool "MCF5271"
depends on !MMU
select COLDFIRE_PIT_TIMER
select M527x
select HAVE_CACHE_SPLIT
select HAVE_IPSBAR
help
Freescale (Motorola) ColdFire 5270/5271 processor support.
config M5272
bool "MCF5272"
depends on !MMU
select COLDFIRE_SW_A7
select COLDFIRE_TIMERS
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Motorola ColdFire 5272 processor support.
config M5275
bool "MCF5275"
depends on !MMU
select COLDFIRE_PIT_TIMER
select M527x
select HAVE_CACHE_SPLIT
select HAVE_IPSBAR
help
Freescale (Motorola) ColdFire 5274/5275 processor support.
config M528x
bool "MCF528x"
depends on !MMU
select COLDFIRE_PIT_TIMER
select HAVE_CACHE_SPLIT
select HAVE_IPSBAR
help
Motorola ColdFire 5280/5282 processor support.
config M5307
bool "MCF5307"
depends on !MMU
select COLDFIRE_TIMERS
select COLDFIRE_SW_A7
select HAVE_CACHE_CB
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Motorola ColdFire 5307 processor support.
config M532x
bool "MCF532x"
depends on !MMU
select COLDFIRE_TIMERS
select M53xx
select HAVE_CACHE_CB
help
Freescale (Motorola) ColdFire 532x processor support.
config M537x
bool "MCF537x"
depends on !MMU
select COLDFIRE_TIMERS
select M53xx
select HAVE_CACHE_CB
help
Freescale ColdFire 537x processor support.
config M5407
bool "MCF5407"
depends on !MMU
select COLDFIRE_SW_A7
select COLDFIRE_TIMERS
select HAVE_CACHE_CB
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Motorola ColdFire 5407 processor support.
config M547x
bool "MCF547x"
select M54xx
select COLDFIRE_SLTIMERS
select MMU_COLDFIRE if MMU
select FPU if MMU
select HAVE_CACHE_CB
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
config M548x
bool "MCF548x"
select COLDFIRE_SLTIMERS
select MMU_COLDFIRE if MMU
select FPU if MMU
select M54xx
select HAVE_CACHE_CB
select HAVE_MBAR
select CPU_NO_EFFICIENT_FFS
help
Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
config M5441x
bool "MCF5441x"
select COLDFIRE_PIT_TIMER
select MMU_COLDFIRE if MMU
select HAVE_CACHE_CB
help
Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
endchoice
config M527x
bool
config M53xx
bool
config M54xx
select HAVE_PCI
bool
config COLDFIRE_PIT_TIMER
bool
config COLDFIRE_TIMERS
bool
select LEGACY_TIMER_TICK
config COLDFIRE_SLTIMERS
bool
select LEGACY_TIMER_TICK
endif # COLDFIRE
comment "Processor Specific Options"
config M68KFPU_EMU
bool "Math emulation support"
depends on (M68KCLASSIC || SUN3) && FPU
help
At some point in the future, this will cause floating-point math
instructions to be emulated by the kernel on machines that lack a
floating-point math coprocessor. Thrill-seekers and chronically
sleep-deprived psychotic hacker types can say Y now, everyone else
should probably wait a while.
config M68KFPU_EMU_EXTRAPREC
bool "Math emulation extra precision"
depends on M68KFPU_EMU
help
The fpu uses normally a few bit more during calculations for
correct rounding, the emulator can (often) do the same but this
extra calculation can cost quite some time, so you can disable
it here. The emulator will then "only" calculate with a 64 bit
mantissa and round slightly incorrect, what is more than enough
for normal usage.
config M68KFPU_EMU_ONLY
bool "Math emulation only kernel"
depends on M68KFPU_EMU
help
This option prevents any floating-point instructions from being
compiled into the kernel, thereby the kernel doesn't save any
floating point context anymore during task switches, so this
kernel will only be usable on machines without a floating-point
math coprocessor. This makes the kernel a bit faster as no tests
needs to be executed whether a floating-point instruction in the
kernel should be executed or not.
config ADVANCED
bool "Advanced configuration options"
depends on MMU
help
This gives you access to some advanced options for the CPU. The
defaults should be fine for most users, but these options may make
it possible for you to improve performance somewhat if you know what
you are doing.
Note that the answer to this question won't directly affect the
kernel: saying N will just cause the configurator to skip all
the questions about these options.
Most users should say N to this question.
config RMW_INSNS
bool "Use read-modify-write instructions"
depends on ADVANCED && !CPU_HAS_NO_CAS
help
This allows to use certain instructions that work with indivisible
read-modify-write bus cycles. While this is faster than the
workaround of disabling interrupts, it can conflict with DMA
( = direct memory access) on many Amiga systems, and it is also said
to destabilize other machines. It is very likely that this will
cause serious problems on any Amiga or Atari Medusa if set. The only
configuration where it should work are 68030-based Ataris, where it
apparently improves performance. But you've been warned! Unless you
really know what you are doing, say N. Try Y only if you're quite
adventurous.
config SINGLE_MEMORY_CHUNK
bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
depends on MMU
default y if SUN3 || MMU_COLDFIRE
help
Ignore all but the first contiguous chunk of physical memory for VM
purposes. This will save a few bytes kernel size and may speed up
some operations.
When this option os set to N, you may want to lower "Maximum zone
order" to save memory that could be wasted for unused memory map.
Say N if not sure.
config ARCH_FORCE_MAX_ORDER
int "Order of maximal physically contiguous allocations" if ADVANCED
depends on !SINGLE_MEMORY_CHUNK
default "10"
help
The kernel page allocator limits the size of maximal physically
contiguous allocations. The limit is called MAX_PAGE_ORDER and it
defines the maximal power of two of number of pages that can be
allocated as a single contiguous block. This option allows
overriding the default setting when ability to allocate very
large blocks of physically contiguous memory is required.
For systems that have holes in their physical address space this
value also defines the minimal size of the hole that allows
freeing unused memory map.
Don't change if unsure.
config 060_WRITETHROUGH
bool "Use write-through caching for 68060 supervisor accesses"
depends on ADVANCED && M68060
help
The 68060 generally uses copyback caching of recently accessed data.
Copyback caching means that memory writes will be held in an on-chip
cache and only written back to memory some time later. Saying Y
here will force supervisor (kernel) accesses to use writethrough
caching. Writethrough caching means that data is written to memory
straight away, so that cache and memory data always agree.
Writethrough caching is less efficient, but is needed for some
drivers on 68060 based systems where the 68060 bus snooping signal
is hardwired on. The 53c710 SCSI driver is known to suffer from
this problem.
config M68K_L2_CACHE
bool
depends on MAC
default y
config CPU_HAS_NO_BITFIELDS
bool
config CPU_HAS_NO_CAS
bool
config CPU_HAS_NO_MULDIV64
bool
config CPU_HAS_NO_UNALIGNED
bool
config CPU_HAS_ADDRESS_SPACES
bool
select ALTERNATE_USER_ADDRESS_SPACE
config FPU
bool
config COLDFIRE_SW_A7
bool
config HAVE_CACHE_SPLIT
bool
config HAVE_CACHE_CB
bool
config HAVE_MBAR
bool
config HAVE_IPSBAR
bool
config CLOCK_FREQ
int "Set the core clock frequency"
default "25000000" if M5206
default "54000000" if M5206e
default "166666666" if M520x
default "140000000" if M5249
default "150000000" if M527x || M523x
default "90000000" if M5307
default "50000000" if M5407
default "266000000" if M54xx
default "66666666"
depends on COLDFIRE
help
Define the CPU clock frequency in use. This is the core clock
frequency, it may or may not be the same as the external clock
crystal fitted to your board. Some processors have an internal
PLL and can have their frequency programmed at run time, others
use internal dividers. In general the kernel won't setup a PLL
if it is fitted (there are some exceptions). This value will be
specific to the exact CPU that you are using.
config OLDMASK
bool "Old mask 5307 (1H55J) silicon"
depends on M5307
help
Build support for the older revision ColdFire 5307 silicon.
Specifically this is the 1H55J mask revision.
if HAVE_CACHE_SPLIT
choice
prompt "Split Cache Configuration"
default CACHE_I
config CACHE_I
bool "Instruction"
help
Use all of the ColdFire CPU cache memory as an instruction cache.
config CACHE_D
bool "Data"
help
Use all of the ColdFire CPU cache memory as a data cache.
config CACHE_BOTH
bool "Both"
help
Split the ColdFire CPU cache, and use half as an instruction cache
and half as a data cache.
endchoice
endif # HAVE_CACHE_SPLIT
if HAVE_CACHE_CB
choice
prompt "Data cache mode"
default CACHE_WRITETHRU
config CACHE_WRITETHRU
bool "Write-through"
help
The ColdFire CPU cache is set into Write-through mode.
config CACHE_COPYBACK
bool "Copy-back"
help
The ColdFire CPU cache is set into Copy-back mode.
endchoice
endif # HAVE_CACHE_CB
# Coldfire cores that do not have a data cache configured can do coherent DMA.
config COLDFIRE_COHERENT_DMA
bool
default y
depends on COLDFIRE
depends on !HAVE_CACHE_CB && !CACHE_D && !CACHE_BOTH
config M68K_NONCOHERENT_DMA
bool
default y
depends on HAS_DMA && !COLDFIRE_COHERENT_DMA
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