xref: /openbmc/linux/arch/arc/Kconfig (revision 827634ad) 
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 BUILDTIME_EXTABLE_SORT
12	select COMMON_CLK
13	select CLONE_BACKWARDS
14	# ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
15	select DEVTMPFS if !INITRAMFS_SOURCE=""
16	select GENERIC_ATOMIC64
17	select GENERIC_CLOCKEVENTS
18	select GENERIC_FIND_FIRST_BIT
19	# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
20	select GENERIC_IRQ_SHOW
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_IOREMAP_PROT
26	select HAVE_KPROBES
27	select HAVE_KRETPROBES
28	select HAVE_MEMBLOCK
29	select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
30	select HAVE_OPROFILE
31	select HAVE_PERF_EVENTS
32	select IRQ_DOMAIN
33	select MODULES_USE_ELF_RELA
34	select NO_BOOTMEM
35	select OF
36	select OF_EARLY_FLATTREE
37	select PERF_USE_VMALLOC
38	select HAVE_DEBUG_STACKOVERFLOW
39
40config TRACE_IRQFLAGS_SUPPORT
41	def_bool y
42
43config LOCKDEP_SUPPORT
44	def_bool y
45
46config SCHED_OMIT_FRAME_POINTER
47	def_bool y
48
49config GENERIC_CSUM
50	def_bool y
51
52config RWSEM_GENERIC_SPINLOCK
53	def_bool y
54
55config ARCH_FLATMEM_ENABLE
56	def_bool y
57
58config MMU
59	def_bool y
60
61config NO_IOPORT_MAP
62	def_bool y
63
64config GENERIC_CALIBRATE_DELAY
65	def_bool y
66
67config GENERIC_HWEIGHT
68	def_bool y
69
70config STACKTRACE_SUPPORT
71	def_bool y
72	select STACKTRACE
73
74config HAVE_LATENCYTOP_SUPPORT
75	def_bool y
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"
85source "arch/arc/plat-tb10x/Kconfig"
86#New platform adds here
87
88endmenu
89
90menu "ARC CPU Configuration"
91
92choice
93	prompt "ARC Core"
94	default ARC_CPU_770
95
96config ARC_CPU_750D
97	bool "ARC750D"
98	help
99	  Support for ARC750 core
100
101config ARC_CPU_770
102	bool "ARC770"
103	select ARC_CPU_REL_4_10
104	help
105	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
106	  This core has a bunch of cool new features:
107	  -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
108                   Shared Address Spaces (for sharing TLB entires in MMU)
109	  -Caches: New Prog Model, Region Flush
110	  -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
111
112endchoice
113
114config CPU_BIG_ENDIAN
115	bool "Enable Big Endian Mode"
116	default n
117	help
118	  Build kernel for Big Endian Mode of ARC CPU
119
120# If a platform can't work with 0x8000_0000 based dma_addr_t
121config ARC_PLAT_NEEDS_CPU_TO_DMA
122	bool
123
124config SMP
125	bool "Symmetric Multi-Processing (Incomplete)"
126	default n
127	help
128	  This enables support for systems with more than one CPU. If you have
129	  a system with only one CPU, say N. If you have a system with more
130	  than one CPU, say Y.
131
132if SMP
133
134config ARC_HAS_COH_CACHES
135	def_bool n
136
137config ARC_HAS_REENTRANT_IRQ_LV2
138	def_bool n
139
140endif
141
142config NR_CPUS
143	int "Maximum number of CPUs (2-4096)"
144	range 2 4096
145	depends on SMP
146	default "2"
147
148menuconfig ARC_CACHE
149	bool "Enable Cache Support"
150	default y
151	# if SMP, cache enabled ONLY if ARC implementation has cache coherency
152	depends on !SMP || ARC_HAS_COH_CACHES
153
154if ARC_CACHE
155
156config ARC_CACHE_LINE_SHIFT
157	int "Cache Line Length (as power of 2)"
158	range 5 7
159	default "6"
160	help
161	  Starting with ARC700 4.9, Cache line length is configurable,
162	  This option specifies "N", with Line-len = 2 power N
163	  So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
164	  Linux only supports same line lengths for I and D caches.
165
166config ARC_HAS_ICACHE
167	bool "Use Instruction Cache"
168	default y
169
170config ARC_HAS_DCACHE
171	bool "Use Data Cache"
172	default y
173
174config ARC_CACHE_PAGES
175	bool "Per Page Cache Control"
176	default y
177	depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
178	help
179	  This can be used to over-ride the global I/D Cache Enable on a
180	  per-page basis (but only for pages accessed via MMU such as
181	  Kernel Virtual address or User Virtual Address)
182	  TLB entries have a per-page Cache Enable Bit.
183	  Note that Global I/D ENABLE + Per Page DISABLE works but corollary
184	  Global DISABLE + Per Page ENABLE won't work
185
186config ARC_CACHE_VIPT_ALIASING
187	bool "Support VIPT Aliasing D$"
188	depends on ARC_HAS_DCACHE
189	default n
190
191endif	#ARC_CACHE
192
193config ARC_HAS_ICCM
194	bool "Use ICCM"
195	help
196	  Single Cycle RAMS to store Fast Path Code
197	default n
198
199config ARC_ICCM_SZ
200	int "ICCM Size in KB"
201	default "64"
202	depends on ARC_HAS_ICCM
203
204config ARC_HAS_DCCM
205	bool "Use DCCM"
206	help
207	  Single Cycle RAMS to store Fast Path Data
208	default n
209
210config ARC_DCCM_SZ
211	int "DCCM Size in KB"
212	default "64"
213	depends on ARC_HAS_DCCM
214
215config ARC_DCCM_BASE
216	hex "DCCM map address"
217	default "0xA0000000"
218	depends on ARC_HAS_DCCM
219
220config ARC_HAS_HW_MPY
221	bool "Use Hardware Multiplier (Normal or Faster XMAC)"
222	default y
223	help
224	  Influences how gcc generates code for MPY operations.
225	  If enabled, MPYxx insns are generated, provided by Standard/XMAC
226	  Multipler. Otherwise software multipy lib is used
227
228choice
229	prompt "ARC700 MMU Version"
230	default ARC_MMU_V3 if ARC_CPU_770
231	default ARC_MMU_V2 if ARC_CPU_750D
232
233config ARC_MMU_V1
234	bool "MMU v1"
235	help
236	  Orig ARC700 MMU
237
238config ARC_MMU_V2
239	bool "MMU v2"
240	help
241	  Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
242	  when 2 D-TLB and 1 I-TLB entries index into same 2way set.
243
244config ARC_MMU_V3
245	bool "MMU v3"
246	depends on ARC_CPU_770
247	help
248	  Introduced with ARC700 4.10: New Features
249	  Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
250	  Shared Address Spaces (SASID)
251
252endchoice
253
254
255choice
256	prompt "MMU Page Size"
257	default ARC_PAGE_SIZE_8K
258
259config ARC_PAGE_SIZE_8K
260	bool "8KB"
261	help
262	  Choose between 8k vs 16k
263
264config ARC_PAGE_SIZE_16K
265	bool "16KB"
266	depends on ARC_MMU_V3
267
268config ARC_PAGE_SIZE_4K
269	bool "4KB"
270	depends on ARC_MMU_V3
271
272endchoice
273
274config ARC_COMPACT_IRQ_LEVELS
275	bool "ARCompact IRQ Priorities: High(2)/Low(1)"
276	default n
277	# Timer HAS to be high priority, for any other high priority config
278	select ARC_IRQ3_LV2
279	# if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
280	depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
281
282if ARC_COMPACT_IRQ_LEVELS
283
284config ARC_IRQ3_LV2
285	bool
286
287config ARC_IRQ5_LV2
288	bool
289
290config ARC_IRQ6_LV2
291	bool
292
293endif
294
295config ARC_FPU_SAVE_RESTORE
296	bool "Enable FPU state persistence across context switch"
297	default n
298	help
299	  Double Precision Floating Point unit had dedictaed regs which
300	  need to be saved/restored across context-switch.
301	  Note that ARC FPU is overly simplistic, unlike say x86, which has
302	  hardware pieces to allow software to conditionally save/restore,
303	  based on actual usage of FPU by a task. Thus our implemn does
304	  this for all tasks in system.
305
306config ARC_CANT_LLSC
307	def_bool n
308
309menuconfig ARC_CPU_REL_4_10
310	bool "Enable support for Rel 4.10 features"
311	default n
312	help
313	  -ARC770 (and dependent features) enabled
314	  -ARC750 also shares some of the new features with 770
315
316config ARC_HAS_LLSC
317	bool "Insn: LLOCK/SCOND (efficient atomic ops)"
318	default y
319	depends on ARC_CPU_770 && !ARC_CANT_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	depends on !SMP
331
332endmenu   # "ARC CPU Configuration"
333
334config LINUX_LINK_BASE
335	hex "Linux Link Address"
336	default "0x80000000"
337	help
338	  ARC700 divides the 32 bit phy address space into two equal halves
339	  -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
340	  -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
341	  Typically Linux kernel is linked at the start of untransalted addr,
342	  hence the default value of 0x8zs.
343	  However some customers have peripherals mapped at this addr, so
344	  Linux needs to be scooted a bit.
345	  If you don't know what the above means, leave this setting alone.
346
347config ARC_CURR_IN_REG
348	bool "Dedicate Register r25 for current_task pointer"
349	default y
350	help
351	  This reserved Register R25 to point to Current Task in
352	  kernel mode. This saves memory access for each such access
353
354
355config ARC_EMUL_UNALIGNED
356	bool "Emulate unaligned memory access (userspace only)"
357	select SYSCTL_ARCH_UNALIGN_NO_WARN
358	select SYSCTL_ARCH_UNALIGN_ALLOW
359	help
360	  This enables misaligned 16 & 32 bit memory access from user space.
361	  Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
362	  potential bugs in code
363
364config HZ
365	int "Timer Frequency"
366	default 100
367
368config ARC_METAWARE_HLINK
369	bool "Support for Metaware debugger assisted Host access"
370	default n
371	help
372	  This options allows a Linux userland apps to directly access
373	  host file system (open/creat/read/write etc) with help from
374	  Metaware Debugger. This can come in handy for Linux-host communication
375	  when there is no real usable peripheral such as EMAC.
376
377menuconfig ARC_DBG
378	bool "ARC debugging"
379	default y
380
381config ARC_DW2_UNWIND
382	bool "Enable DWARF specific kernel stack unwind"
383	depends on ARC_DBG
384	default y
385	select KALLSYMS
386	help
387	  Compiles the kernel with DWARF unwind information and can be used
388	  to get stack backtraces.
389
390	  If you say Y here the resulting kernel image will be slightly larger
391	  but not slower, and it will give very useful debugging information.
392	  If you don't debug the kernel, you can say N, but we may not be able
393	  to solve problems without frame unwind information
394
395config ARC_DBG_TLB_PARANOIA
396	bool "Paranoia Checks in Low Level TLB Handlers"
397	depends on ARC_DBG
398	default n
399
400config ARC_DBG_TLB_MISS_COUNT
401	bool "Profile TLB Misses"
402	default n
403	select DEBUG_FS
404	depends on ARC_DBG
405	help
406	  Counts number of I and D TLB Misses and exports them via Debugfs
407	  The counters can be cleared via Debugfs as well
408
409config ARC_BUILTIN_DTB_NAME
410	string "Built in DTB"
411	help
412	  Set the name of the DTB to embed in the vmlinux binary
413	  Leaving it blank selects the minimal "skeleton" dtb
414
415source "kernel/Kconfig.preempt"
416
417menu "Executable file formats"
418source "fs/Kconfig.binfmt"
419endmenu
420
421endmenu	 # "ARC Architecture Configuration"
422
423source "mm/Kconfig"
424source "net/Kconfig"
425source "drivers/Kconfig"
426source "fs/Kconfig"
427source "arch/arc/Kconfig.debug"
428source "security/Kconfig"
429source "crypto/Kconfig"
430source "lib/Kconfig"
431source "kernel/power/Kconfig"
432