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linux/arch/m68k/Kconfig.cpu
Greg Ungerer 84f3fb7a2a m68k: handle presence of 64bit mul/div instructions cleanly 
The traditional 68000 processors and the newer reduced instruction set
ColdFire processors do not support the 32*32->64 multiply or the 64/32->32
divide instructions. This is not a difference based on the presence of
a hardware MMU or not.

Create a new config symbol to mark that a CPU type doesn't support the
longer multiply/divide instructions. Use this then as a basis for using
the fast 64bit based divide (in div64.h) and for linking in the extra
libgcc functions that may be required (mulsi3, divsi3, etc).

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
2011-12-24 21:47:57 +10:00

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comment "Processor Type"
config M68000
bool
select CPU_HAS_NO_BITFIELDS
select CPU_HAS_NO_MULDIV64
select GENERIC_CSUM
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 MCPU32
bool
select CPU_HAS_NO_BITFIELDS
help
The Freescale (was then Motorola) CPU32 is a CPU core that is
based on the 68020 processor. For the most part it is used in
System-On-Chip parts, and does not contain a paging MMU.
config COLDFIRE
bool
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
select CPU_HAS_NO_BITFIELDS
select CPU_HAS_NO_MULDIV64
select GENERIC_CSUM
help
The Freescale ColdFire family of processors is a modern derivitive
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.
config M68020
bool "68020 support"
depends on MMU
select GENERIC_ATOMIC64
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.
config M68030
bool "68030 support"
depends on MMU && !MMU_SUN3
select GENERIC_ATOMIC64
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"
depends on MMU && !MMU_SUN3
select GENERIC_ATOMIC64
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"
depends on MMU && !MMU_SUN3
select GENERIC_ATOMIC64
help
If you anticipate running this kernel on a computer with a MC68060
processor, say Y. Otherwise, say N.
config M68328
bool "MC68328"
depends on !MMU
select M68000
help
Motorola 68328 processor support.
config M68EZ328
bool "MC68EZ328"
depends on !MMU
select M68000
help
Motorola 68EX328 processor support.
config M68VZ328
bool "MC68VZ328"
depends on !MMU
select M68000
help
Motorola 68VZ328 processor support.
config M68360
bool "MC68360"
depends on !MMU
select MCPU32
help
Motorola 68360 processor support.
config M5206
bool "MCF5206"
depends on !MMU
select COLDFIRE
select COLDFIRE_SW_A7
select HAVE_MBAR
help
Motorola ColdFire 5206 processor support.
config M5206e
bool "MCF5206e"
depends on !MMU
select COLDFIRE
select COLDFIRE_SW_A7
select HAVE_MBAR
help
Motorola ColdFire 5206e processor support.
config M520x
bool "MCF520x"
depends on !MMU
select COLDFIRE
select GENERIC_CLOCKEVENTS
select HAVE_CACHE_SPLIT
help
Freescale Coldfire 5207/5208 processor support.
config M523x
bool "MCF523x"
depends on !MMU
select COLDFIRE
select GENERIC_CLOCKEVENTS
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
select COLDFIRE_SW_A7
select HAVE_MBAR
help
Motorola ColdFire 5249 processor support.
config M527x
bool
config M5271
bool "MCF5271"
depends on !MMU
select COLDFIRE
select M527x
select HAVE_CACHE_SPLIT
select HAVE_IPSBAR
select GENERIC_CLOCKEVENTS
help
Freescale (Motorola) ColdFire 5270/5271 processor support.
config M5272
bool "MCF5272"
depends on !MMU
select COLDFIRE
select COLDFIRE_SW_A7
select HAVE_MBAR
help
Motorola ColdFire 5272 processor support.
config M5275
bool "MCF5275"
depends on !MMU
select COLDFIRE
select M527x
select HAVE_CACHE_SPLIT
select HAVE_IPSBAR
select GENERIC_CLOCKEVENTS
help
Freescale (Motorola) ColdFire 5274/5275 processor support.
config M528x
bool "MCF528x"
depends on !MMU
select COLDFIRE
select GENERIC_CLOCKEVENTS
select HAVE_CACHE_SPLIT
select HAVE_IPSBAR
help
Motorola ColdFire 5280/5282 processor support.
config M5307
bool "MCF5307"
depends on !MMU
select COLDFIRE
select COLDFIRE_SW_A7
select HAVE_CACHE_CB
select HAVE_MBAR
help
Motorola ColdFire 5307 processor support.
config M532x
bool "MCF532x"
depends on !MMU
select COLDFIRE
select HAVE_CACHE_CB
help
Freescale (Motorola) ColdFire 532x processor support.
config M5407
bool "MCF5407"
depends on !MMU
select COLDFIRE
select COLDFIRE_SW_A7
select HAVE_CACHE_CB
select HAVE_MBAR
help
Motorola ColdFire 5407 processor support.
config M54xx
bool
config M547x
bool "MCF547x"
depends on !MMU
select COLDFIRE
select M54xx
select HAVE_CACHE_CB
select HAVE_MBAR
help
Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
config M548x
bool "MCF548x"
depends on !MMU
select COLDFIRE
select M54xx
select HAVE_CACHE_CB
select HAVE_MBAR
help
Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
comment "Processor Specific Options"
config M68KFPU_EMU
bool "Math emulation support (EXPERIMENTAL)"
depends on MMU
depends on EXPERIMENTAL
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
---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
select NEED_MULTIPLE_NODES
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. Say N if not sure.
config ARCH_DISCONTIGMEM_ENABLE
def_bool MMU && !SINGLE_MEMORY_CHUNK
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 NODES_SHIFT
int
default "3"
depends on !SINGLE_MEMORY_CHUNK
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_SET
bool "Enable setting the CPU clock frequency"
depends on COLDFIRE
default n
help
On some CPU's you do not need to know what the core CPU clock
frequency is. On these you can disable clock setting. On some
traditional 68K parts, and on all ColdFire parts you need to set
the appropriate CPU clock frequency. On these devices many of the
onboard peripherals derive their timing from the master CPU clock
frequency.
config CLOCK_FREQ
int "Set the core clock frequency"
default "66666666"
depends on CLOCK_SET
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
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
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