m68k: reorganize Kconfig options to improve mmu/non-mmu selections

The current mmu and non-mmu Kconfig files can be merged to form
a more general selection of options. The current break up of options
is due to the simple brute force merge from the m68k and m68knommu
arch directories.

Many of the options are not at all specific to having the MMU enabled
or not. They are actually associated with a particular CPU type or
platform type.

Ultimately as we support all processors with the MMU disabled we need
many of these options to be selectable without the MMU option enabled.
And likewise some of the ColdFire processors, which currently are only
supported with the MMU disabled, do have MMU hardware, and will need
to have options selected on CPU type, not MMU disabled.

This patch removes the old mmu and non-mmu Kconfigs and instead breaks
up the configuration into four areas: cpu, machine, bus, devices.

The Kconfig.cpu lists all the options associated with selecting a CPU,
and includes options specific to each CPU type as well.

Kconfig.machine lists all options associated with selecting a machine
type. Almost always the machines selectable is restricted by the chosen
CPU.

Kconfig.bus contains options associated with selecting bus types on the
various machine types. That includes PCI bus, PCMCIA bus, etc.

Kconfig.devices contains options for drivers and driver associated
options.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

1 files changed, 429 insertions, 0 deletions

diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
new file mode 100644
index 00000000000..e632b2d1210
--- /dev/null
+++ b/arch/m68k/Kconfig.cpu
@@ -0,0 +1,429 @@
+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
+	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
+	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
+	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
+	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
+