xref: /openbmc/linux/arch/arc/Kconfig (revision 8851b9f1) 
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_PENDING_IRQ if SMP
20	select GENERIC_SMP_IDLE_THREAD
21	select HAVE_ARCH_KGDB
22	select HAVE_ARCH_TRACEHOOK
23	select HAVE_GENERIC_HARDIRQS
24	select HAVE_IOREMAP_PROT
25	select HAVE_KPROBES
26	select HAVE_KRETPROBES
27	select HAVE_MEMBLOCK
28	select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
29	select HAVE_OPROFILE
30	select HAVE_PERF_EVENTS
31	select IRQ_DOMAIN
32	select MODULES_USE_ELF_RELA
33	select NO_BOOTMEM
34	select OF
35	select OF_EARLY_FLATTREE
36	select PERF_USE_VMALLOC
37	select HAVE_DEBUG_STACKOVERFLOW
38
39config SCHED_OMIT_FRAME_POINTER
40	def_bool y
41
42config GENERIC_CSUM
43	def_bool y
44
45config RWSEM_GENERIC_SPINLOCK
46	def_bool y
47
48config ARCH_FLATMEM_ENABLE
49	def_bool y
50
51config MMU
52	def_bool y
53
54config NO_IOPORT
55	def_bool y
56
57config GENERIC_CALIBRATE_DELAY
58	def_bool y
59
60config GENERIC_HWEIGHT
61	def_bool y
62
63config STACKTRACE_SUPPORT
64	def_bool y
65	select STACKTRACE
66
67config HAVE_LATENCYTOP_SUPPORT
68	def_bool y
69
70config NO_DMA
71	def_bool n
72
73source "init/Kconfig"
74source "kernel/Kconfig.freezer"
75
76menu "ARC Architecture Configuration"
77
78menu "ARC Platform/SoC/Board"
79
80source "arch/arc/plat-arcfpga/Kconfig"
81source "arch/arc/plat-tb10x/Kconfig"
82#New platform adds here
83
84endmenu
85
86menu "ARC CPU Configuration"
87
88choice
89	prompt "ARC Core"
90	default ARC_CPU_770
91
92config ARC_CPU_750D
93	bool "ARC750D"
94	help
95	  Support for ARC750 core
96
97config ARC_CPU_770
98	bool "ARC770"
99	select ARC_CPU_REL_4_10
100	help
101	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
102	  This core has a bunch of cool new features:
103	  -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
104                   Shared Address Spaces (for sharing TLB entires in MMU)
105	  -Caches: New Prog Model, Region Flush
106	  -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
107
108endchoice
109
110config CPU_BIG_ENDIAN
111	bool "Enable Big Endian Mode"
112	default n
113	help
114	  Build kernel for Big Endian Mode of ARC CPU
115
116# If a platform can't work with 0x8000_0000 based dma_addr_t
117config ARC_PLAT_NEEDS_CPU_TO_DMA
118	bool
119
120config SMP
121	bool "Symmetric Multi-Processing (Incomplete)"
122	default n
123	select USE_GENERIC_SMP_HELPERS
124	help
125	  This enables support for systems with more than one CPU. If you have
126	  a system with only one CPU, like most personal computers, say N. If
127	  you have a system with more than one CPU, say Y.
128
129if SMP
130
131config ARC_HAS_COH_CACHES
132	def_bool n
133
134config ARC_HAS_COH_RTSC
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 (2-32)"
144	range 2 32
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	# 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 HZ
367	int "Timer Frequency"
368	default 100
369
370config ARC_METAWARE_HLINK
371	bool "Support for Metaware debugger assisted Host access"
372	default n
373	help
374	  This options allows a Linux userland apps to directly access
375	  host file system (open/creat/read/write etc) with help from
376	  Metaware Debugger. This can come in handy for Linux-host communication
377	  when there is no real usable peripheral such as EMAC.
378
379menuconfig ARC_DBG
380	bool "ARC debugging"
381	default y
382
383config ARC_DW2_UNWIND
384	bool "Enable DWARF specific kernel stack unwind"
385	depends on ARC_DBG
386	default y
387	select KALLSYMS
388	help
389	  Compiles the kernel with DWARF unwind information and can be used
390	  to get stack backtraces.
391
392	  If you say Y here the resulting kernel image will be slightly larger
393	  but not slower, and it will give very useful debugging information.
394	  If you don't debug the kernel, you can say N, but we may not be able
395	  to solve problems without frame unwind information
396
397config ARC_DBG_TLB_PARANOIA
398	bool "Paranoia Checks in Low Level TLB Handlers"
399	depends on ARC_DBG
400	default n
401
402config ARC_DBG_TLB_MISS_COUNT
403	bool "Profile TLB Misses"
404	default n
405	select DEBUG_FS
406	depends on ARC_DBG
407	help
408	  Counts number of I and D TLB Misses and exports them via Debugfs
409	  The counters can be cleared via Debugfs as well
410
411config CMDLINE_UBOOT
412	bool "Support U-boot kernel command line passing"
413	default n
414	help
415	  If you are using U-boot (www.denx.de) and wish to pass the kernel
416	  command line from the U-boot environment to the Linux kernel then
417	  switch this option on.
418	  ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
419	  to it. kernel startup code will append this to DeviceTree
420	  /bootargs provided cmdline args.
421
422config ARC_BUILTIN_DTB_NAME
423	string "Built in DTB"
424	help
425	  Set the name of the DTB to embed in the vmlinux binary
426	  Leaving it blank selects the minimal "skeleton" dtb
427
428source "kernel/Kconfig.preempt"
429
430menu "Executable file formats"
431source "fs/Kconfig.binfmt"
432endmenu
433
434endmenu	 # "ARC Architecture Configuration"
435
436source "mm/Kconfig"
437source "net/Kconfig"
438source "drivers/Kconfig"
439source "fs/Kconfig"
440source "arch/arc/Kconfig.debug"
441source "security/Kconfig"
442source "crypto/Kconfig"
443source "lib/Kconfig"
444