xref: /linux/arch/arc/Kconfig (revision cfdbc2e16e65c1ec1c23057640607cee98d1a1bd) 
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 ARCH_NO_VIRT_TO_BUS
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_GENERIC_HARDIRQS
22	select MODULES_USE_ELF_RELA
23
24config SCHED_OMIT_FRAME_POINTER
25	def_bool y
26
27config GENERIC_CSUM
28	def_bool y
29
30config RWSEM_GENERIC_SPINLOCK
31	def_bool y
32
33config ARCH_FLATMEM_ENABLE
34	def_bool y
35
36config MMU
37	def_bool y
38
39config NO_IOPORT
40	def_bool y
41
42config GENERIC_CALIBRATE_DELAY
43	def_bool y
44
45config GENERIC_HWEIGHT
46	def_bool y
47
48config BINFMT_ELF
49	def_bool y
50
51config HAVE_LATENCYTOP_SUPPORT
52	def_bool y
53
54config NO_DMA
55	def_bool n
56
57source "init/Kconfig"
58source "kernel/Kconfig.freezer"
59
60menu "ARC Architecture Configuration"
61
62choice
63	prompt "ARC Platform"
64	default ARC_PLAT_FPGA_LEGACY
65
66config ARC_PLAT_FPGA_LEGACY
67	bool "\"Legacy\" ARC FPGA dev platform"
68	help
69	  Support for ARC development platforms, provided by Synopsys.
70	  These are based on FPGA or ISS. e.g.
71	  - ARCAngel4
72	  - ML509
73	  - MetaWare ISS
74
75#New platform adds here
76endchoice
77
78menu "ARC CPU Configuration"
79
80choice
81	prompt "ARC Core"
82	default ARC_CPU_770
83
84config ARC_CPU_750D
85	bool "ARC750D"
86	help
87	  Support for ARC750 core
88
89config ARC_CPU_770
90	bool "ARC770"
91	select ARC_CPU_REL_4_10
92	help
93	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
94	  This core has a bunch of cool new features:
95	  -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
96                   Shared Address Spaces (for sharing TLB entires in MMU)
97	  -Caches: New Prog Model, Region Flush
98	  -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
99
100endchoice
101
102config CPU_BIG_ENDIAN
103	bool "Enable Big Endian Mode"
104	default n
105	help
106	  Build kernel for Big Endian Mode of ARC CPU
107
108menuconfig ARC_CACHE
109	bool "Enable Cache Support"
110	default y
111
112if ARC_CACHE
113
114config ARC_CACHE_LINE_SHIFT
115	int "Cache Line Length (as power of 2)"
116	range 5 7
117	default "6"
118	help
119	  Starting with ARC700 4.9, Cache line length is configurable,
120	  This option specifies "N", with Line-len = 2 power N
121	  So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
122	  Linux only supports same line lengths for I and D caches.
123
124config ARC_HAS_ICACHE
125	bool "Use Instruction Cache"
126	default y
127
128config ARC_HAS_DCACHE
129	bool "Use Data Cache"
130	default y
131
132config ARC_CACHE_PAGES
133	bool "Per Page Cache Control"
134	default y
135	depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
136	help
137	  This can be used to over-ride the global I/D Cache Enable on a
138	  per-page basis (but only for pages accessed via MMU such as
139	  Kernel Virtual address or User Virtual Address)
140	  TLB entries have a per-page Cache Enable Bit.
141	  Note that Global I/D ENABLE + Per Page DISABLE works but corollary
142	  Global DISABLE + Per Page ENABLE won't work
143
144endif	#ARC_CACHE
145
146config ARC_HAS_HW_MPY
147	bool "Use Hardware Multiplier (Normal or Faster XMAC)"
148	default y
149	help
150	  Influences how gcc generates code for MPY operations.
151	  If enabled, MPYxx insns are generated, provided by Standard/XMAC
152	  Multipler. Otherwise software multipy lib is used
153
154choice
155	prompt "ARC700 MMU Version"
156	default ARC_MMU_V3 if ARC_CPU_770
157	default ARC_MMU_V2 if ARC_CPU_750D
158
159config ARC_MMU_V1
160	bool "MMU v1"
161	help
162	  Orig ARC700 MMU
163
164config ARC_MMU_V2
165	bool "MMU v2"
166	help
167	  Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
168	  when 2 D-TLB and 1 I-TLB entries index into same 2way set.
169
170config ARC_MMU_V3
171	bool "MMU v3"
172	depends on ARC_CPU_770
173	help
174	  Introduced with ARC700 4.10: New Features
175	  Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
176	  Shared Address Spaces (SASID)
177
178endchoice
179
180
181choice
182	prompt "MMU Page Size"
183	default ARC_PAGE_SIZE_8K
184
185config ARC_PAGE_SIZE_8K
186	bool "8KB"
187	help
188	  Choose between 8k vs 16k
189
190config ARC_PAGE_SIZE_16K
191	bool "16KB"
192	depends on ARC_MMU_V3
193
194config ARC_PAGE_SIZE_4K
195	bool "4KB"
196	depends on ARC_MMU_V3
197
198endchoice
199
200config ARC_FPU_SAVE_RESTORE
201	bool "Enable FPU state persistence across context switch"
202	default n
203	help
204	  Double Precision Floating Point unit had dedictaed regs which
205	  need to be saved/restored across context-switch.
206	  Note that ARC FPU is overly simplistic, unlike say x86, which has
207	  hardware pieces to allow software to conditionally save/restore,
208	  based on actual usage of FPU by a task. Thus our implemn does
209	  this for all tasks in system.
210
211menuconfig ARC_CPU_REL_4_10
212	bool "Enable support for Rel 4.10 features"
213	default n
214	help
215	  -ARC770 (and dependent features) enabled
216	  -ARC750 also shares some of the new features with 770
217
218config ARC_HAS_LLSC
219	bool "Insn: LLOCK/SCOND (efficient atomic ops)"
220	default y
221	depends on ARC_CPU_770
222	# if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
223	depends on !SMP || ARC_HAS_COH_LLSC
224
225config ARC_HAS_SWAPE
226	bool "Insn: SWAPE (endian-swap)"
227	default y
228	depends on ARC_CPU_REL_4_10
229
230config ARC_HAS_RTSC
231	bool "Insn: RTSC (64-bit r/o cycle counter)"
232	default y
233	depends on ARC_CPU_REL_4_10
234
235endmenu   # "ARC CPU Configuration"
236
237menu "Platform Board Configuration"
238
239source "arch/arc/plat-arcfpga/Kconfig"
240
241#New platform adds here
242
243config ARC_PLAT_CLK
244	int "Clk speed in Hz"
245	default "80000000"
246
247config LINUX_LINK_BASE
248	hex "Linux Link Address"
249	default "0x80000000"
250	help
251	  ARC700 divides the 32 bit phy address space into two equal halves
252	  -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
253	  -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
254	  Typically Linux kernel is linked at the start of untransalted addr,
255	  hence the default value of 0x8zs.
256	  However some customers have peripherals mapped at this addr, so
257	  Linux needs to be scooted a bit.
258	  If you don't know what the above means, leave this setting alone.
259
260config ARC_PLAT_SDRAM_SIZE
261	hex "SD RAM Size"
262	default "0x10000000"
263	help
264	  Implies the amount of SDRAM/DRAM Linux is going to claim/own.
265	  The actual memory itself could be larger than this number. But for
266	  all software purposes, this is the amt of memory.
267
268endmenu # "Platform Board Configuration"
269
270config ARC_STACK_NONEXEC
271	bool "Make stack non-executable"
272	default n
273	help
274	  To disable the execute permissions of stack/heap of processes
275	  which are enabled by default.
276
277config HZ
278	int "Timer Frequency"
279	default 100
280
281menuconfig ARC_DBG
282	bool "ARC debugging"
283	default y
284
285config ARC_DBG_TLB_PARANOIA
286	bool "Paranoia Checks in Low Level TLB Handlers"
287	depends on ARC_DBG
288	default n
289
290config ARC_DBG_TLB_MISS_COUNT
291	bool "Profile TLB Misses"
292	default n
293	select DEBUG_FS
294	depends on ARC_DBG
295	help
296	  Counts number of I and D TLB Misses and exports them via Debugfs
297	  The counters can be cleared via Debugfs as well
298
299config CMDLINE
300	string "Kernel command line to built-in"
301	default "print-fatal-signals=1"
302	help
303	  The default command line which will be appended to the optional
304	  u-boot provided command line (see below)
305
306config CMDLINE_UBOOT
307	bool "Support U-boot kernel command line passing"
308	default n
309	help
310	  If you are using U-boot (www.denx.de) and wish to pass the kernel
311	  command line from the U-boot environment to the Linux kernel then
312	  switch this option on.
313	  ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
314	  to it. kernel startup code will copy the string into cmdline buffer
315	  and also append CONFIG_CMDLINE.
316
317source "kernel/Kconfig.preempt"
318
319endmenu	 # "ARC Architecture Configuration"
320
321source "mm/Kconfig"
322source "net/Kconfig"
323source "drivers/Kconfig"
324source "fs/Kconfig"
325source "arch/arc/Kconfig.debug"
326source "security/Kconfig"
327source "crypto/Kconfig"
328source "lib/Kconfig"
329