xref: /openbmc/linux/arch/arc/Kconfig (revision 97da55fc) 
1#
2# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3#
4# This program is free software; you can redistribute it and/or modify
5# it under the terms of the GNU General Public License version 2 as
6# published by the Free Software Foundation.
7#
8
9config ARC
10	def_bool y
11	select CLONE_BACKWARDS
12	# ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
13	select DEVTMPFS if !INITRAMFS_SOURCE=""
14	select GENERIC_ATOMIC64
15	select GENERIC_CLOCKEVENTS
16	select GENERIC_FIND_FIRST_BIT
17	# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
18	select GENERIC_IRQ_SHOW
19	select GENERIC_KERNEL_EXECVE
20	select GENERIC_KERNEL_THREAD
21	select GENERIC_PENDING_IRQ if SMP
22	select GENERIC_SMP_IDLE_THREAD
23	select HAVE_ARCH_KGDB
24	select HAVE_ARCH_TRACEHOOK
25	select HAVE_GENERIC_HARDIRQS
26	select HAVE_IOREMAP_PROT
27	select HAVE_KPROBES
28	select HAVE_KRETPROBES
29	select HAVE_MEMBLOCK
30	select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
31	select HAVE_OPROFILE
32	select HAVE_PERF_EVENTS
33	select IRQ_DOMAIN
34	select MODULES_USE_ELF_RELA
35	select NO_BOOTMEM
36	select OF
37	select OF_EARLY_FLATTREE
38	select PERF_USE_VMALLOC
39
40config SCHED_OMIT_FRAME_POINTER
41	def_bool y
42
43config GENERIC_CSUM
44	def_bool y
45
46config RWSEM_GENERIC_SPINLOCK
47	def_bool y
48
49config ARCH_FLATMEM_ENABLE
50	def_bool y
51
52config MMU
53	def_bool y
54
55config NO_IOPORT
56	def_bool y
57
58config GENERIC_CALIBRATE_DELAY
59	def_bool y
60
61config GENERIC_HWEIGHT
62	def_bool y
63
64config BINFMT_ELF
65	def_bool y
66
67config STACKTRACE_SUPPORT
68	def_bool y
69	select STACKTRACE
70
71config HAVE_LATENCYTOP_SUPPORT
72	def_bool y
73
74config NO_DMA
75	def_bool n
76
77source "init/Kconfig"
78source "kernel/Kconfig.freezer"
79
80menu "ARC Architecture Configuration"
81
82menu "ARC Platform/SoC/Board"
83
84source "arch/arc/plat-arcfpga/Kconfig"
85#New platform adds here
86
87endmenu
88
89menu "ARC CPU Configuration"
90
91choice
92	prompt "ARC Core"
93	default ARC_CPU_770
94
95config ARC_CPU_750D
96	bool "ARC750D"
97	help
98	  Support for ARC750 core
99
100config ARC_CPU_770
101	bool "ARC770"
102	select ARC_CPU_REL_4_10
103	help
104	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
105	  This core has a bunch of cool new features:
106	  -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
107                   Shared Address Spaces (for sharing TLB entires in MMU)
108	  -Caches: New Prog Model, Region Flush
109	  -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
110
111endchoice
112
113config CPU_BIG_ENDIAN
114	bool "Enable Big Endian Mode"
115	default n
116	help
117	  Build kernel for Big Endian Mode of ARC CPU
118
119# If a platform can't work with 0x8000_0000 based dma_addr_t
120config ARC_PLAT_NEEDS_CPU_TO_DMA
121	bool
122
123config SMP
124	bool "Symmetric Multi-Processing (Incomplete)"
125	default n
126	select USE_GENERIC_SMP_HELPERS
127	help
128	  This enables support for systems with more than one CPU. If you have
129	  a system with only one CPU, like most personal computers, say N. If
130	  you have a system with more than one CPU, say Y.
131
132if SMP
133
134config ARC_HAS_COH_CACHES
135	def_bool n
136
137config ARC_HAS_COH_LLSC
138	def_bool n
139
140config ARC_HAS_COH_RTSC
141	def_bool n
142
143config ARC_HAS_REENTRANT_IRQ_LV2
144	def_bool n
145
146endif
147
148config NR_CPUS
149	int "Maximum number of CPUs (2-32)"
150	range 2 32
151	depends on SMP
152	default "2"
153
154menuconfig ARC_CACHE
155	bool "Enable Cache Support"
156	default y
157	# if SMP, cache enabled ONLY if ARC implementation has cache coherency
158	depends on !SMP || ARC_HAS_COH_CACHES
159
160if ARC_CACHE
161
162config ARC_CACHE_LINE_SHIFT
163	int "Cache Line Length (as power of 2)"
164	range 5 7
165	default "6"
166	help
167	  Starting with ARC700 4.9, Cache line length is configurable,
168	  This option specifies "N", with Line-len = 2 power N
169	  So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
170	  Linux only supports same line lengths for I and D caches.
171
172config ARC_HAS_ICACHE
173	bool "Use Instruction Cache"
174	default y
175
176config ARC_HAS_DCACHE
177	bool "Use Data Cache"
178	default y
179
180config ARC_CACHE_PAGES
181	bool "Per Page Cache Control"
182	default y
183	depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
184	help
185	  This can be used to over-ride the global I/D Cache Enable on a
186	  per-page basis (but only for pages accessed via MMU such as
187	  Kernel Virtual address or User Virtual Address)
188	  TLB entries have a per-page Cache Enable Bit.
189	  Note that Global I/D ENABLE + Per Page DISABLE works but corollary
190	  Global DISABLE + Per Page ENABLE won't work
191
192endif	#ARC_CACHE
193
194config ARC_HAS_ICCM
195	bool "Use ICCM"
196	help
197	  Single Cycle RAMS to store Fast Path Code
198	default n
199
200config ARC_ICCM_SZ
201	int "ICCM Size in KB"
202	default "64"
203	depends on ARC_HAS_ICCM
204
205config ARC_HAS_DCCM
206	bool "Use DCCM"
207	help
208	  Single Cycle RAMS to store Fast Path Data
209	default n
210
211config ARC_DCCM_SZ
212	int "DCCM Size in KB"
213	default "64"
214	depends on ARC_HAS_DCCM
215
216config ARC_DCCM_BASE
217	hex "DCCM map address"
218	default "0xA0000000"
219	depends on ARC_HAS_DCCM
220
221config ARC_HAS_HW_MPY
222	bool "Use Hardware Multiplier (Normal or Faster XMAC)"
223	default y
224	help
225	  Influences how gcc generates code for MPY operations.
226	  If enabled, MPYxx insns are generated, provided by Standard/XMAC
227	  Multipler. Otherwise software multipy lib is used
228
229choice
230	prompt "ARC700 MMU Version"
231	default ARC_MMU_V3 if ARC_CPU_770
232	default ARC_MMU_V2 if ARC_CPU_750D
233
234config ARC_MMU_V1
235	bool "MMU v1"
236	help
237	  Orig ARC700 MMU
238
239config ARC_MMU_V2
240	bool "MMU v2"
241	help
242	  Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
243	  when 2 D-TLB and 1 I-TLB entries index into same 2way set.
244
245config ARC_MMU_V3
246	bool "MMU v3"
247	depends on ARC_CPU_770
248	help
249	  Introduced with ARC700 4.10: New Features
250	  Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
251	  Shared Address Spaces (SASID)
252
253endchoice
254
255
256choice
257	prompt "MMU Page Size"
258	default ARC_PAGE_SIZE_8K
259
260config ARC_PAGE_SIZE_8K
261	bool "8KB"
262	help
263	  Choose between 8k vs 16k
264
265config ARC_PAGE_SIZE_16K
266	bool "16KB"
267	depends on ARC_MMU_V3
268
269config ARC_PAGE_SIZE_4K
270	bool "4KB"
271	depends on ARC_MMU_V3
272
273endchoice
274
275config ARC_COMPACT_IRQ_LEVELS
276	bool "ARCompact IRQ Priorities: High(2)/Low(1)"
277	default n
278	# Timer HAS to be high priority, for any other high priority config
279	select ARC_IRQ3_LV2
280	# if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
281	depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
282
283if ARC_COMPACT_IRQ_LEVELS
284
285config ARC_IRQ3_LV2
286	bool
287
288config ARC_IRQ5_LV2
289	bool
290
291config ARC_IRQ6_LV2
292	bool
293
294endif
295
296config ARC_FPU_SAVE_RESTORE
297	bool "Enable FPU state persistence across context switch"
298	default n
299	help
300	  Double Precision Floating Point unit had dedictaed regs which
301	  need to be saved/restored across context-switch.
302	  Note that ARC FPU is overly simplistic, unlike say x86, which has
303	  hardware pieces to allow software to conditionally save/restore,
304	  based on actual usage of FPU by a task. Thus our implemn does
305	  this for all tasks in system.
306
307menuconfig ARC_CPU_REL_4_10
308	bool "Enable support for Rel 4.10 features"
309	default n
310	help
311	  -ARC770 (and dependent features) enabled
312	  -ARC750 also shares some of the new features with 770
313
314config ARC_HAS_LLSC
315	bool "Insn: LLOCK/SCOND (efficient atomic ops)"
316	default y
317	depends on ARC_CPU_770
318	# if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
319	depends on !SMP || ARC_HAS_COH_LLSC
320
321config ARC_HAS_SWAPE
322	bool "Insn: SWAPE (endian-swap)"
323	default y
324	depends on ARC_CPU_REL_4_10
325
326config ARC_HAS_RTSC
327	bool "Insn: RTSC (64-bit r/o cycle counter)"
328	default y
329	depends on ARC_CPU_REL_4_10
330	# if SMP, enable RTSC only if counter is coherent across cores
331	depends on !SMP || ARC_HAS_COH_RTSC
332
333endmenu   # "ARC CPU Configuration"
334
335config LINUX_LINK_BASE
336	hex "Linux Link Address"
337	default "0x80000000"
338	help
339	  ARC700 divides the 32 bit phy address space into two equal halves
340	  -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
341	  -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
342	  Typically Linux kernel is linked at the start of untransalted addr,
343	  hence the default value of 0x8zs.
344	  However some customers have peripherals mapped at this addr, so
345	  Linux needs to be scooted a bit.
346	  If you don't know what the above means, leave this setting alone.
347
348config ARC_CURR_IN_REG
349	bool "Dedicate Register r25 for current_task pointer"
350	default y
351	help
352	  This reserved Register R25 to point to Current Task in
353	  kernel mode. This saves memory access for each such access
354
355
356config ARC_MISALIGN_ACCESS
357	bool "Emulate unaligned memory access (userspace only)"
358	default N
359	select SYSCTL_ARCH_UNALIGN_NO_WARN
360	select SYSCTL_ARCH_UNALIGN_ALLOW
361	help
362	  This enables misaligned 16 & 32 bit memory access from user space.
363	  Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
364	  potential bugs in code
365
366config ARC_STACK_NONEXEC
367	bool "Make stack non-executable"
368	default n
369	help
370	  To disable the execute permissions of stack/heap of processes
371	  which are enabled by default.
372
373config HZ
374	int "Timer Frequency"
375	default 100
376
377config ARC_METAWARE_HLINK
378	bool "Support for Metaware debugger assisted Host access"
379	default n
380	help
381	  This options allows a Linux userland apps to directly access
382	  host file system (open/creat/read/write etc) with help from
383	  Metaware Debugger. This can come in handy for Linux-host communication
384	  when there is no real usable peripheral such as EMAC.
385
386menuconfig ARC_DBG
387	bool "ARC debugging"
388	default y
389
390config ARC_DW2_UNWIND
391	bool "Enable DWARF specific kernel stack unwind"
392	depends on ARC_DBG
393	default y
394	select KALLSYMS
395	help
396	  Compiles the kernel with DWARF unwind information and can be used
397	  to get stack backtraces.
398
399	  If you say Y here the resulting kernel image will be slightly larger
400	  but not slower, and it will give very useful debugging information.
401	  If you don't debug the kernel, you can say N, but we may not be able
402	  to solve problems without frame unwind information
403
404config ARC_DBG_TLB_PARANOIA
405	bool "Paranoia Checks in Low Level TLB Handlers"
406	depends on ARC_DBG
407	default n
408
409config ARC_DBG_TLB_MISS_COUNT
410	bool "Profile TLB Misses"
411	default n
412	select DEBUG_FS
413	depends on ARC_DBG
414	help
415	  Counts number of I and D TLB Misses and exports them via Debugfs
416	  The counters can be cleared via Debugfs as well
417
418config CMDLINE
419	string "Kernel command line to built-in"
420	default "print-fatal-signals=1"
421	help
422	  The default command line which will be appended to the optional
423	  u-boot provided command line (see below)
424
425config CMDLINE_UBOOT
426	bool "Support U-boot kernel command line passing"
427	default n
428	help
429	  If you are using U-boot (www.denx.de) and wish to pass the kernel
430	  command line from the U-boot environment to the Linux kernel then
431	  switch this option on.
432	  ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
433	  to it. kernel startup code will copy the string into cmdline buffer
434	  and also append CONFIG_CMDLINE.
435
436config ARC_BUILTIN_DTB_NAME
437	string "Built in DTB"
438	help
439	  Set the name of the DTB to embed in the vmlinux binary
440	  Leaving it blank selects the minimal "skeleton" dtb
441
442source "kernel/Kconfig.preempt"
443
444endmenu	 # "ARC Architecture Configuration"
445
446source "mm/Kconfig"
447source "net/Kconfig"
448source "drivers/Kconfig"
449source "fs/Kconfig"
450source "arch/arc/Kconfig.debug"
451source "security/Kconfig"
452source "crypto/Kconfig"
453source "lib/Kconfig"
454