xref: /openbmc/linux/arch/arc/Kconfig (revision 79f08d9e) 
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_IOREMAP_PROT
24	select HAVE_KPROBES
25	select HAVE_KRETPROBES
26	select HAVE_MEMBLOCK
27	select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
28	select HAVE_OPROFILE
29	select HAVE_PERF_EVENTS
30	select IRQ_DOMAIN
31	select MODULES_USE_ELF_RELA
32	select NO_BOOTMEM
33	select OF
34	select OF_EARLY_FLATTREE
35	select PERF_USE_VMALLOC
36	select HAVE_DEBUG_STACKOVERFLOW
37
38config TRACE_IRQFLAGS_SUPPORT
39	def_bool y
40
41config LOCKDEP_SUPPORT
42	def_bool y
43
44config SCHED_OMIT_FRAME_POINTER
45	def_bool y
46
47config GENERIC_CSUM
48	def_bool y
49
50config RWSEM_GENERIC_SPINLOCK
51	def_bool y
52
53config ARCH_FLATMEM_ENABLE
54	def_bool y
55
56config MMU
57	def_bool y
58
59config NO_IOPORT
60	def_bool y
61
62config GENERIC_CALIBRATE_DELAY
63	def_bool y
64
65config GENERIC_HWEIGHT
66	def_bool y
67
68config STACKTRACE_SUPPORT
69	def_bool y
70	select STACKTRACE
71
72config HAVE_LATENCYTOP_SUPPORT
73	def_bool y
74
75config NO_DMA
76	def_bool n
77
78source "init/Kconfig"
79source "kernel/Kconfig.freezer"
80
81menu "ARC Architecture Configuration"
82
83menu "ARC Platform/SoC/Board"
84
85source "arch/arc/plat-arcfpga/Kconfig"
86source "arch/arc/plat-tb10x/Kconfig"
87#New platform adds here
88
89endmenu
90
91menu "ARC CPU Configuration"
92
93choice
94	prompt "ARC Core"
95	default ARC_CPU_770
96
97config ARC_CPU_750D
98	bool "ARC750D"
99	help
100	  Support for ARC750 core
101
102config ARC_CPU_770
103	bool "ARC770"
104	select ARC_CPU_REL_4_10
105	help
106	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
107	  This core has a bunch of cool new features:
108	  -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
109                   Shared Address Spaces (for sharing TLB entires in MMU)
110	  -Caches: New Prog Model, Region Flush
111	  -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
112
113endchoice
114
115config CPU_BIG_ENDIAN
116	bool "Enable Big Endian Mode"
117	default n
118	help
119	  Build kernel for Big Endian Mode of ARC CPU
120
121# If a platform can't work with 0x8000_0000 based dma_addr_t
122config ARC_PLAT_NEEDS_CPU_TO_DMA
123	bool
124
125config SMP
126	bool "Symmetric Multi-Processing (Incomplete)"
127	default n
128	help
129	  This enables support for systems with more than one CPU. If you have
130	  a system with only one CPU, like most personal computers, say N. If
131	  you have a system with more than one CPU, say Y.
132
133if SMP
134
135config ARC_HAS_COH_CACHES
136	def_bool n
137
138config ARC_HAS_REENTRANT_IRQ_LV2
139	def_bool n
140
141endif
142
143config NR_CPUS
144	int "Maximum number of CPUs (2-4096)"
145	range 2 4096
146	depends on SMP
147	default "2"
148
149menuconfig ARC_CACHE
150	bool "Enable Cache Support"
151	default y
152	# if SMP, cache enabled ONLY if ARC implementation has cache coherency
153	depends on !SMP || ARC_HAS_COH_CACHES
154
155if ARC_CACHE
156
157config ARC_CACHE_LINE_SHIFT
158	int "Cache Line Length (as power of 2)"
159	range 5 7
160	default "6"
161	help
162	  Starting with ARC700 4.9, Cache line length is configurable,
163	  This option specifies "N", with Line-len = 2 power N
164	  So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
165	  Linux only supports same line lengths for I and D caches.
166
167config ARC_HAS_ICACHE
168	bool "Use Instruction Cache"
169	default y
170
171config ARC_HAS_DCACHE
172	bool "Use Data Cache"
173	default y
174
175config ARC_CACHE_PAGES
176	bool "Per Page Cache Control"
177	default y
178	depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
179	help
180	  This can be used to over-ride the global I/D Cache Enable on a
181	  per-page basis (but only for pages accessed via MMU such as
182	  Kernel Virtual address or User Virtual Address)
183	  TLB entries have a per-page Cache Enable Bit.
184	  Note that Global I/D ENABLE + Per Page DISABLE works but corollary
185	  Global DISABLE + Per Page ENABLE won't work
186
187config ARC_CACHE_VIPT_ALIASING
188	bool "Support VIPT Aliasing D$"
189	depends on ARC_HAS_DCACHE
190	default n
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
307config ARC_CANT_LLSC
308	def_bool n
309
310menuconfig ARC_CPU_REL_4_10
311	bool "Enable support for Rel 4.10 features"
312	default n
313	help
314	  -ARC770 (and dependent features) enabled
315	  -ARC750 also shares some of the new features with 770
316
317config ARC_HAS_LLSC
318	bool "Insn: LLOCK/SCOND (efficient atomic ops)"
319	default y
320	depends on ARC_CPU_770 && !ARC_CANT_LLSC
321
322config ARC_HAS_SWAPE
323	bool "Insn: SWAPE (endian-swap)"
324	default y
325	depends on ARC_CPU_REL_4_10
326
327config ARC_HAS_RTSC
328	bool "Insn: RTSC (64-bit r/o cycle counter)"
329	default y
330	depends on ARC_CPU_REL_4_10
331	depends on !SMP
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