xref: /linux/arch/m68k/Kconfig.cpu (revision 0d456bad36d42d16022be045c8a53ddbb59ee478)
1comment "Processor Type"
2
3choice
4	prompt "CPU family support"
5	default M68KCLASSIC if MMU
6	default COLDFIRE if !MMU
7	help
8	  The Freescale (was Motorola) M68K family of processors implements
9	  the full 68000 processor instruction set.
10	  The Freescale ColdFire family of processors is a modern derivative
11	  of the 68000 processor family. They are mainly targeted at embedded
12	  applications, and are all System-On-Chip (SOC) devices, as opposed
13	  to stand alone CPUs. They implement a subset of the original 68000
14	  processor instruction set.
15	  If you anticipate running this kernel on a computer with a classic
16	  MC68xxx processor, select M68KCLASSIC.
17	  If you anticipate running this kernel on a computer with a ColdFire
18	  processor, select COLDFIRE.
19
20config M68KCLASSIC
21	bool "Classic M68K CPU family support"
22
23config COLDFIRE
24	bool "Coldfire CPU family support"
25	select GENERIC_GPIO
26	select ARCH_WANT_OPTIONAL_GPIOLIB
27	select ARCH_HAVE_CUSTOM_GPIO_H
28	select CPU_HAS_NO_BITFIELDS
29	select CPU_HAS_NO_MULDIV64
30	select GENERIC_CSUM
31	select HAVE_CLK
32
33endchoice
34
35if M68KCLASSIC
36
37config M68000
38	bool "MC68000"
39	depends on !MMU
40	select CPU_HAS_NO_BITFIELDS
41	select CPU_HAS_NO_MULDIV64
42	select CPU_HAS_NO_UNALIGNED
43	select GENERIC_CSUM
44	help
45	  The Freescale (was Motorola) 68000 CPU is the first generation of
46	  the well known M68K family of processors. The CPU core as well as
47	  being available as a stand alone CPU was also used in many
48	  System-On-Chip devices (eg 68328, 68302, etc). It does not contain
49	  a paging MMU.
50
51config MCPU32
52	bool
53	select CPU_HAS_NO_BITFIELDS
54	select CPU_HAS_NO_UNALIGNED
55	help
56	  The Freescale (was then Motorola) CPU32 is a CPU core that is
57	  based on the 68020 processor. For the most part it is used in
58	  System-On-Chip parts, and does not contain a paging MMU.
59
60config M68020
61	bool "68020 support"
62	depends on MMU
63	select CPU_HAS_ADDRESS_SPACES
64	help
65	  If you anticipate running this kernel on a computer with a MC68020
66	  processor, say Y. Otherwise, say N. Note that the 68020 requires a
67	  68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
68	  Sun 3, which provides its own version.
69
70config M68030
71	bool "68030 support"
72	depends on MMU && !MMU_SUN3
73	select CPU_HAS_ADDRESS_SPACES
74	help
75	  If you anticipate running this kernel on a computer with a MC68030
76	  processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
77	  work, as it does not include an MMU (Memory Management Unit).
78
79config M68040
80	bool "68040 support"
81	depends on MMU && !MMU_SUN3
82	select CPU_HAS_ADDRESS_SPACES
83	help
84	  If you anticipate running this kernel on a computer with a MC68LC040
85	  or MC68040 processor, say Y. Otherwise, say N. Note that an
86	  MC68EC040 will not work, as it does not include an MMU (Memory
87	  Management Unit).
88
89config M68060
90	bool "68060 support"
91	depends on MMU && !MMU_SUN3
92	select CPU_HAS_ADDRESS_SPACES
93	help
94	  If you anticipate running this kernel on a computer with a MC68060
95	  processor, say Y. Otherwise, say N.
96
97config M68328
98	bool "MC68328"
99	depends on !MMU
100	select M68000
101	help
102	  Motorola 68328 processor support.
103
104config M68EZ328
105	bool "MC68EZ328"
106	depends on !MMU
107	select M68000
108	help
109	  Motorola 68EX328 processor support.
110
111config M68VZ328
112	bool "MC68VZ328"
113	depends on !MMU
114	select M68000
115	help
116	  Motorola 68VZ328 processor support.
117
118config M68360
119	bool "MC68360"
120	depends on !MMU
121	select MCPU32
122	help
123	  Motorola 68360 processor support.
124
125endif # M68KCLASSIC
126
127if COLDFIRE
128
129config M5206
130	bool "MCF5206"
131	depends on !MMU
132	select COLDFIRE_SW_A7
133	select HAVE_MBAR
134	help
135	  Motorola ColdFire 5206 processor support.
136
137config M5206e
138	bool "MCF5206e"
139	depends on !MMU
140	select COLDFIRE_SW_A7
141	select HAVE_MBAR
142	help
143	  Motorola ColdFire 5206e processor support.
144
145config M520x
146	bool "MCF520x"
147	depends on !MMU
148	select GENERIC_CLOCKEVENTS
149	select HAVE_CACHE_SPLIT
150	help
151	   Freescale Coldfire 5207/5208 processor support.
152
153config M523x
154	bool "MCF523x"
155	depends on !MMU
156	select GENERIC_CLOCKEVENTS
157	select HAVE_CACHE_SPLIT
158	select HAVE_IPSBAR
159	help
160	  Freescale Coldfire 5230/1/2/4/5 processor support
161
162config M5249
163	bool "MCF5249"
164	depends on !MMU
165	select COLDFIRE_SW_A7
166	select HAVE_MBAR
167	help
168	  Motorola ColdFire 5249 processor support.
169
170config M525x
171	bool "MCF525x"
172	depends on !MMU
173	select COLDFIRE_SW_A7
174	select HAVE_MBAR
175	help
176	  Freescale (Motorola) Coldfire 5251/5253 processor support.
177
178config M527x
179	bool
180
181config M5271
182	bool "MCF5271"
183	depends on !MMU
184	select M527x
185	select HAVE_CACHE_SPLIT
186	select HAVE_IPSBAR
187	select GENERIC_CLOCKEVENTS
188	help
189	  Freescale (Motorola) ColdFire 5270/5271 processor support.
190
191config M5272
192	bool "MCF5272"
193	depends on !MMU
194	select COLDFIRE_SW_A7
195	select HAVE_MBAR
196	help
197	  Motorola ColdFire 5272 processor support.
198
199config M5275
200	bool "MCF5275"
201	depends on !MMU
202	select M527x
203	select HAVE_CACHE_SPLIT
204	select HAVE_IPSBAR
205	select GENERIC_CLOCKEVENTS
206	help
207	  Freescale (Motorola) ColdFire 5274/5275 processor support.
208
209config M528x
210	bool "MCF528x"
211	depends on !MMU
212	select GENERIC_CLOCKEVENTS
213	select HAVE_CACHE_SPLIT
214	select HAVE_IPSBAR
215	help
216	  Motorola ColdFire 5280/5282 processor support.
217
218config M5307
219	bool "MCF5307"
220	depends on !MMU
221	select COLDFIRE_SW_A7
222	select HAVE_CACHE_CB
223	select HAVE_MBAR
224	help
225	  Motorola ColdFire 5307 processor support.
226
227config M532x
228	bool "MCF532x"
229	depends on !MMU
230	select HAVE_CACHE_CB
231	help
232	  Freescale (Motorola) ColdFire 532x processor support.
233
234config M5407
235	bool "MCF5407"
236	depends on !MMU
237	select COLDFIRE_SW_A7
238	select HAVE_CACHE_CB
239	select HAVE_MBAR
240	help
241	  Motorola ColdFire 5407 processor support.
242
243config M54xx
244	bool
245
246config M547x
247	bool "MCF547x"
248	select M54xx
249	select MMU_COLDFIRE if MMU
250	select HAVE_CACHE_CB
251	select HAVE_MBAR
252	help
253	  Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
254
255config M548x
256	bool "MCF548x"
257	select MMU_COLDFIRE if MMU
258	select M54xx
259	select HAVE_CACHE_CB
260	select HAVE_MBAR
261	help
262	  Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
263
264config M5441x
265	bool "MCF5441x"
266	depends on !MMU
267	select GENERIC_CLOCKEVENTS
268	select HAVE_CACHE_CB
269	help
270	  Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
271
272endif # COLDFIRE
273
274
275comment "Processor Specific Options"
276
277config M68KFPU_EMU
278	bool "Math emulation support"
279	depends on MMU
280	help
281	  At some point in the future, this will cause floating-point math
282	  instructions to be emulated by the kernel on machines that lack a
283	  floating-point math coprocessor.  Thrill-seekers and chronically
284	  sleep-deprived psychotic hacker types can say Y now, everyone else
285	  should probably wait a while.
286
287config M68KFPU_EMU_EXTRAPREC
288	bool "Math emulation extra precision"
289	depends on M68KFPU_EMU
290	help
291	  The fpu uses normally a few bit more during calculations for
292	  correct rounding, the emulator can (often) do the same but this
293	  extra calculation can cost quite some time, so you can disable
294	  it here. The emulator will then "only" calculate with a 64 bit
295	  mantissa and round slightly incorrect, what is more than enough
296	  for normal usage.
297
298config M68KFPU_EMU_ONLY
299	bool "Math emulation only kernel"
300	depends on M68KFPU_EMU
301	help
302	  This option prevents any floating-point instructions from being
303	  compiled into the kernel, thereby the kernel doesn't save any
304	  floating point context anymore during task switches, so this
305	  kernel will only be usable on machines without a floating-point
306	  math coprocessor. This makes the kernel a bit faster as no tests
307	  needs to be executed whether a floating-point instruction in the
308	  kernel should be executed or not.
309
310config ADVANCED
311	bool "Advanced configuration options"
312	depends on MMU
313	---help---
314	  This gives you access to some advanced options for the CPU. The
315	  defaults should be fine for most users, but these options may make
316	  it possible for you to improve performance somewhat if you know what
317	  you are doing.
318
319	  Note that the answer to this question won't directly affect the
320	  kernel: saying N will just cause the configurator to skip all
321	  the questions about these options.
322
323	  Most users should say N to this question.
324
325config RMW_INSNS
326	bool "Use read-modify-write instructions"
327	depends on ADVANCED
328	---help---
329	  This allows to use certain instructions that work with indivisible
330	  read-modify-write bus cycles. While this is faster than the
331	  workaround of disabling interrupts, it can conflict with DMA
332	  ( = direct memory access) on many Amiga systems, and it is also said
333	  to destabilize other machines. It is very likely that this will
334	  cause serious problems on any Amiga or Atari Medusa if set. The only
335	  configuration where it should work are 68030-based Ataris, where it
336	  apparently improves performance. But you've been warned! Unless you
337	  really know what you are doing, say N. Try Y only if you're quite
338	  adventurous.
339
340config SINGLE_MEMORY_CHUNK
341	bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
342	depends on MMU
343	default y if SUN3
344	select NEED_MULTIPLE_NODES
345	help
346	  Ignore all but the first contiguous chunk of physical memory for VM
347	  purposes.  This will save a few bytes kernel size and may speed up
348	  some operations.  Say N if not sure.
349
350config ARCH_DISCONTIGMEM_ENABLE
351	def_bool MMU && !SINGLE_MEMORY_CHUNK
352
353config 060_WRITETHROUGH
354	bool "Use write-through caching for 68060 supervisor accesses"
355	depends on ADVANCED && M68060
356	---help---
357	  The 68060 generally uses copyback caching of recently accessed data.
358	  Copyback caching means that memory writes will be held in an on-chip
359	  cache and only written back to memory some time later.  Saying Y
360	  here will force supervisor (kernel) accesses to use writethrough
361	  caching.  Writethrough caching means that data is written to memory
362	  straight away, so that cache and memory data always agree.
363	  Writethrough caching is less efficient, but is needed for some
364	  drivers on 68060 based systems where the 68060 bus snooping signal
365	  is hardwired on.  The 53c710 SCSI driver is known to suffer from
366	  this problem.
367
368config M68K_L2_CACHE
369	bool
370	depends on MAC
371	default y
372
373config NODES_SHIFT
374	int
375	default "3"
376	depends on !SINGLE_MEMORY_CHUNK
377
378config CPU_HAS_NO_BITFIELDS
379	bool
380
381config CPU_HAS_NO_MULDIV64
382	bool
383
384config CPU_HAS_NO_UNALIGNED
385	bool
386
387config CPU_HAS_ADDRESS_SPACES
388	bool
389
390config FPU
391	bool
392
393config COLDFIRE_SW_A7
394	bool
395
396config HAVE_CACHE_SPLIT
397	bool
398
399config HAVE_CACHE_CB
400	bool
401
402config HAVE_MBAR
403	bool
404
405config HAVE_IPSBAR
406	bool
407
408config CLOCK_SET
409	bool "Enable setting the CPU clock frequency"
410	depends on COLDFIRE
411	default n
412	help
413	  On some CPU's you do not need to know what the core CPU clock
414	  frequency is. On these you can disable clock setting. On some
415	  traditional 68K parts, and on all ColdFire parts you need to set
416	  the appropriate CPU clock frequency. On these devices many of the
417	  onboard peripherals derive their timing from the master CPU clock
418	  frequency.
419
420config CLOCK_FREQ
421	int "Set the core clock frequency"
422	default "66666666"
423	depends on CLOCK_SET
424	help
425	  Define the CPU clock frequency in use. This is the core clock
426	  frequency, it may or may not be the same as the external clock
427	  crystal fitted to your board. Some processors have an internal
428	  PLL and can have their frequency programmed at run time, others
429	  use internal dividers. In general the kernel won't setup a PLL
430	  if it is fitted (there are some exceptions). This value will be
431	  specific to the exact CPU that you are using.
432
433config OLDMASK
434	bool "Old mask 5307 (1H55J) silicon"
435	depends on M5307
436	help
437	  Build support for the older revision ColdFire 5307 silicon.
438	  Specifically this is the 1H55J mask revision.
439
440if HAVE_CACHE_SPLIT
441choice
442	prompt "Split Cache Configuration"
443	default CACHE_I
444
445config CACHE_I
446	bool "Instruction"
447	help
448	  Use all of the ColdFire CPU cache memory as an instruction cache.
449
450config CACHE_D
451	bool "Data"
452	help
453	  Use all of the ColdFire CPU cache memory as a data cache.
454
455config CACHE_BOTH
456	bool "Both"
457	help
458	  Split the ColdFire CPU cache, and use half as an instruction cache
459	  and half as a data cache.
460endchoice
461endif
462
463if HAVE_CACHE_CB
464choice
465	prompt "Data cache mode"
466	default CACHE_WRITETHRU
467
468config CACHE_WRITETHRU
469	bool "Write-through"
470	help
471	  The ColdFire CPU cache is set into Write-through mode.
472
473config CACHE_COPYBACK
474	bool "Copy-back"
475	help
476	  The ColdFire CPU cache is set into Copy-back mode.
477endchoice
478endif
479
480