path: root/arch/m68k/Kconfig.cpu

comment "Processor Type"

config M68000
	bool
	select CPU_HAS_NO_BITFIELDS
	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
	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