1# SPDX-License-Identifier: GPL-2.0-only
  2#
  3# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  4#
  5
  6config ARC
  7	def_bool y
  8	select ARC_TIMERS
  9	select ARCH_HAS_DEBUG_VM_PGTABLE
 10	select ARCH_HAS_DMA_PREP_COHERENT
 11	select ARCH_HAS_PTE_SPECIAL
 12	select ARCH_HAS_SETUP_DMA_OPS
 13	select ARCH_HAS_SYNC_DMA_FOR_CPU
 14	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 15	select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
 16	select ARCH_32BIT_OFF_T
 17	select BUILDTIME_TABLE_SORT
 18	select CLONE_BACKWARDS
 19	select COMMON_CLK
 20	select DMA_DIRECT_REMAP
 21	select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
 22	select GENERIC_CLOCKEVENTS
 23	select GENERIC_FIND_FIRST_BIT
 24	# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
 25	select GENERIC_IRQ_SHOW
 26	select GENERIC_PCI_IOMAP
 27	select GENERIC_PENDING_IRQ if SMP
 28	select GENERIC_SCHED_CLOCK
 29	select GENERIC_SMP_IDLE_THREAD
 30	select HAVE_ARCH_KGDB
 31	select HAVE_ARCH_TRACEHOOK
 32	select HAVE_DEBUG_STACKOVERFLOW
 33	select HAVE_DEBUG_KMEMLEAK
 34	select HAVE_FUTEX_CMPXCHG if FUTEX
 35	select HAVE_IOREMAP_PROT
 36	select HAVE_KERNEL_GZIP
 37	select HAVE_KERNEL_LZMA
 38	select HAVE_KPROBES
 39	select HAVE_KRETPROBES
 40	select HAVE_MOD_ARCH_SPECIFIC
 41	select HAVE_OPROFILE
 42	select HAVE_PERF_EVENTS
 43	select HANDLE_DOMAIN_IRQ
 44	select IRQ_DOMAIN
 45	select MODULES_USE_ELF_RELA
 46	select OF
 47	select OF_EARLY_FLATTREE
 48	select PCI_SYSCALL if PCI
 49	select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING
 50	select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
 51
 52config ARCH_HAS_CACHE_LINE_SIZE
 53	def_bool y
 54
 55config TRACE_IRQFLAGS_SUPPORT
 56	def_bool y
 57
 58config LOCKDEP_SUPPORT
 59	def_bool y
 60
 61config SCHED_OMIT_FRAME_POINTER
 62	def_bool y
 63
 64config GENERIC_CSUM
 65	def_bool y
 66
 67config ARCH_DISCONTIGMEM_ENABLE
 68	def_bool n
 69
 70config ARCH_FLATMEM_ENABLE
 71	def_bool y
 72
 73config MMU
 74	def_bool y
 75
 76config NO_IOPORT_MAP
 77	def_bool y
 78
 79config GENERIC_CALIBRATE_DELAY
 80	def_bool y
 81
 82config GENERIC_HWEIGHT
 83	def_bool y
 84
 85config STACKTRACE_SUPPORT
 86	def_bool y
 87	select STACKTRACE
 88
 89config HAVE_ARCH_TRANSPARENT_HUGEPAGE
 90	def_bool y
 91	depends on ARC_MMU_V4
 92
 93menu "ARC Architecture Configuration"
 94
 95menu "ARC Platform/SoC/Board"
 96
 97source "arch/arc/plat-tb10x/Kconfig"
 98source "arch/arc/plat-axs10x/Kconfig"
 99#New platform adds here
100source "arch/arc/plat-eznps/Kconfig"
101source "arch/arc/plat-hsdk/Kconfig"
102
103endmenu
104
105choice
106	prompt "ARC Instruction Set"
107	default ISA_ARCV2
108
109config ISA_ARCOMPACT
110	bool "ARCompact ISA"
111	select CPU_NO_EFFICIENT_FFS
112	help
113	  The original ARC ISA of ARC600/700 cores
114
115config ISA_ARCV2
116	bool "ARC ISA v2"
117	select ARC_TIMERS_64BIT
118	help
119	  ISA for the Next Generation ARC-HS cores
120
121endchoice
122
123menu "ARC CPU Configuration"
124
125choice
126	prompt "ARC Core"
127	default ARC_CPU_770 if ISA_ARCOMPACT
128	default ARC_CPU_HS if ISA_ARCV2
129
130if ISA_ARCOMPACT
131
132config ARC_CPU_750D
133	bool "ARC750D"
134	select ARC_CANT_LLSC
135	help
136	  Support for ARC750 core
137
138config ARC_CPU_770
139	bool "ARC770"
140	select ARC_HAS_SWAPE
141	help
142	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
143	  This core has a bunch of cool new features:
144	  -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
145	           Shared Address Spaces (for sharing TLB entries in MMU)
146	  -Caches: New Prog Model, Region Flush
147	  -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
148
149endif #ISA_ARCOMPACT
150
151config ARC_CPU_HS
152	bool "ARC-HS"
153	depends on ISA_ARCV2
154	help
155	  Support for ARC HS38x Cores based on ARCv2 ISA
156	  The notable features are:
157	    - SMP configurations of up to 4 cores with coherency
158	    - Optional L2 Cache and IO-Coherency
159	    - Revised Interrupt Architecture (multiple priorites, reg banks,
160	        auto stack switch, auto regfile save/restore)
161	    - MMUv4 (PIPT dcache, Huge Pages)
162	    - Instructions for
163		* 64bit load/store: LDD, STD
164		* Hardware assisted divide/remainder: DIV, REM
165		* Function prologue/epilogue: ENTER_S, LEAVE_S
166		* IRQ enable/disable: CLRI, SETI
167		* pop count: FFS, FLS
168		* SETcc, BMSKN, XBFU...
169
170endchoice
171
172config ARC_TUNE_MCPU
173	string "Override default -mcpu compiler flag"
174	default ""
175	help
176	  Override default -mcpu=xxx compiler flag (which is set depending on
177	  the ISA version) with the specified value.
178	  NOTE: If specified flag isn't supported by current compiler the
179	  ISA default value will be used as a fallback.
180
181config CPU_BIG_ENDIAN
182	bool "Enable Big Endian Mode"
183	help
184	  Build kernel for Big Endian Mode of ARC CPU
185
186config SMP
187	bool "Symmetric Multi-Processing"
188	select ARC_MCIP if ISA_ARCV2
189	help
190	  This enables support for systems with more than one CPU.
191
192if SMP
193
194config NR_CPUS
195	int "Maximum number of CPUs (2-4096)"
196	range 2 4096
197	default "4"
198
199config ARC_SMP_HALT_ON_RESET
200	bool "Enable Halt-on-reset boot mode"
201	help
202	  In SMP configuration cores can be configured as Halt-on-reset
203	  or they could all start at same time. For Halt-on-reset, non
204	  masters are parked until Master kicks them so they can start off
205	  at designated entry point. For other case, all jump to common
206	  entry point and spin wait for Master's signal.
207
208endif #SMP
209
210config ARC_MCIP
211	bool "ARConnect Multicore IP (MCIP) Support "
212	depends on ISA_ARCV2
213	default y if SMP
214	help
215	  This IP block enables SMP in ARC-HS38 cores.
216	  It provides for cross-core interrupts, multi-core debug
217	  hardware semaphores, shared memory,....
218
219menuconfig ARC_CACHE
220	bool "Enable Cache Support"
221	default y
222
223if ARC_CACHE
224
225config ARC_CACHE_LINE_SHIFT
226	int "Cache Line Length (as power of 2)"
227	range 5 7
228	default "6"
229	help
230	  Starting with ARC700 4.9, Cache line length is configurable,
231	  This option specifies "N", with Line-len = 2 power N
232	  So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
233	  Linux only supports same line lengths for I and D caches.
234
235config ARC_HAS_ICACHE
236	bool "Use Instruction Cache"
237	default y
238
239config ARC_HAS_DCACHE
240	bool "Use Data Cache"
241	default y
242
243config ARC_CACHE_PAGES
244	bool "Per Page Cache Control"
245	default y
246	depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
247	help
248	  This can be used to over-ride the global I/D Cache Enable on a
249	  per-page basis (but only for pages accessed via MMU such as
250	  Kernel Virtual address or User Virtual Address)
251	  TLB entries have a per-page Cache Enable Bit.
252	  Note that Global I/D ENABLE + Per Page DISABLE works but corollary
253	  Global DISABLE + Per Page ENABLE won't work
254
255config ARC_CACHE_VIPT_ALIASING
256	bool "Support VIPT Aliasing D$"
257	depends on ARC_HAS_DCACHE && ISA_ARCOMPACT
258
259endif #ARC_CACHE
260
261config ARC_HAS_ICCM
262	bool "Use ICCM"
263	help
264	  Single Cycle RAMS to store Fast Path Code
265
266config ARC_ICCM_SZ
267	int "ICCM Size in KB"
268	default "64"
269	depends on ARC_HAS_ICCM
270
271config ARC_HAS_DCCM
272	bool "Use DCCM"
273	help
274	  Single Cycle RAMS to store Fast Path Data
275
276config ARC_DCCM_SZ
277	int "DCCM Size in KB"
278	default "64"
279	depends on ARC_HAS_DCCM
280
281config ARC_DCCM_BASE
282	hex "DCCM map address"
283	default "0xA0000000"
284	depends on ARC_HAS_DCCM
285
286choice
287	prompt "MMU Version"
288	default ARC_MMU_V3 if ARC_CPU_770
289	default ARC_MMU_V2 if ARC_CPU_750D
290	default ARC_MMU_V4 if ARC_CPU_HS
291
292if ISA_ARCOMPACT
293
294config ARC_MMU_V1
295	bool "MMU v1"
296	help
297	  Orig ARC700 MMU
298
299config ARC_MMU_V2
300	bool "MMU v2"
301	help
302	  Fixed the deficiency of v1 - possible thrashing in memcpy scenario
303	  when 2 D-TLB and 1 I-TLB entries index into same 2way set.
304
305config ARC_MMU_V3
306	bool "MMU v3"
307	depends on ARC_CPU_770
308	help
309	  Introduced with ARC700 4.10: New Features
310	  Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
311	  Shared Address Spaces (SASID)
312
313endif
314
315config ARC_MMU_V4
316	bool "MMU v4"
317	depends on ISA_ARCV2
318
319endchoice
320
321
322choice
323	prompt "MMU Page Size"
324	default ARC_PAGE_SIZE_8K
325
326config ARC_PAGE_SIZE_8K
327	bool "8KB"
328	help
329	  Choose between 8k vs 16k
330
331config ARC_PAGE_SIZE_16K
332	bool "16KB"
333	depends on ARC_MMU_V3 || ARC_MMU_V4
334
335config ARC_PAGE_SIZE_4K
336	bool "4KB"
337	depends on ARC_MMU_V3 || ARC_MMU_V4
338
339endchoice
340
341choice
342	prompt "MMU Super Page Size"
343	depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE
344	default ARC_HUGEPAGE_2M
345
346config ARC_HUGEPAGE_2M
347	bool "2MB"
348
349config ARC_HUGEPAGE_16M
350	bool "16MB"
351
352endchoice
353
354config NODES_SHIFT
355	int "Maximum NUMA Nodes (as a power of 2)"
356	default "0" if !DISCONTIGMEM
357	default "1" if DISCONTIGMEM
358	depends on NEED_MULTIPLE_NODES
359	help
360	  Accessing memory beyond 1GB (with or w/o PAE) requires 2 memory
361	  zones.
362
363config ARC_COMPACT_IRQ_LEVELS
364	depends on ISA_ARCOMPACT
365	bool "Setup Timer IRQ as high Priority"
366	# if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
367	depends on !SMP
368
369config ARC_FPU_SAVE_RESTORE
370	bool "Enable FPU state persistence across context switch"
371	help
372	  ARCompact FPU has internal registers to assist with Double precision
373	  Floating Point operations. There are control and stauts registers
374	  for floating point exceptions and rounding modes. These are
375	  preserved across task context switch when enabled.
376
377config ARC_CANT_LLSC
378	def_bool n
379
380config ARC_HAS_LLSC
381	bool "Insn: LLOCK/SCOND (efficient atomic ops)"
382	default y
383	depends on !ARC_CANT_LLSC
384
385config ARC_HAS_SWAPE
386	bool "Insn: SWAPE (endian-swap)"
387	default y
388
389if ISA_ARCV2
390
391config ARC_USE_UNALIGNED_MEM_ACCESS
392	bool "Enable unaligned access in HW"
393	default y
394	select HAVE_EFFICIENT_UNALIGNED_ACCESS
395	help
396	  The ARC HS architecture supports unaligned memory access
397	  which is disabled by default. Enable unaligned access in
398	  hardware and use software to use it
399
400config ARC_HAS_LL64
401	bool "Insn: 64bit LDD/STD"
402	help
403	  Enable gcc to generate 64-bit load/store instructions
404	  ISA mandates even/odd registers to allow encoding of two
405	  dest operands with 2 possible source operands.
406	default y
407
408config ARC_HAS_DIV_REM
409	bool "Insn: div, divu, rem, remu"
410	default y
411
412config ARC_HAS_ACCL_REGS
413	bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)"
414	default y
415	help
416	  Depending on the configuration, CPU can contain accumulator reg-pair
417	  (also referred to as r58:r59). These can also be used by gcc as GPR so
418	  kernel needs to save/restore per process
419
420config ARC_DSP_HANDLED
421	def_bool n
422
423config ARC_DSP_SAVE_RESTORE_REGS
424	def_bool n
425
426choice
427	prompt "DSP support"
428	default ARC_DSP_NONE
429	help
430	  Depending on the configuration, CPU can contain DSP registers
431	  (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_CTRL, DSP_FFT_CTRL).
432	  Bellow is options describing how to handle these registers in
433	  interrupt entry / exit and in context switch.
434
435config ARC_DSP_NONE
436	bool "No DSP extension presence in HW"
437	help
438	  No DSP extension presence in HW
439
440config ARC_DSP_KERNEL
441	bool "DSP extension in HW, no support for userspace"
442	select ARC_HAS_ACCL_REGS
443	select ARC_DSP_HANDLED
444	help
445	  DSP extension presence in HW, no support for DSP-enabled userspace
446	  applications. We don't save / restore DSP registers and only do
447	  some minimal preparations so userspace won't be able to break kernel
448
449config ARC_DSP_USERSPACE
450	bool "Support DSP for userspace apps"
451	select ARC_HAS_ACCL_REGS
452	select ARC_DSP_HANDLED
453	select ARC_DSP_SAVE_RESTORE_REGS
454	help
455	  DSP extension presence in HW, support save / restore DSP registers to
456	  run DSP-enabled userspace applications
457
458config ARC_DSP_AGU_USERSPACE
459	bool "Support DSP with AGU for userspace apps"
460	select ARC_HAS_ACCL_REGS
461	select ARC_DSP_HANDLED
462	select ARC_DSP_SAVE_RESTORE_REGS
463	help
464	  DSP and AGU extensions presence in HW, support save / restore DSP
465	  and AGU registers to run DSP-enabled userspace applications
466endchoice
467
468config ARC_IRQ_NO_AUTOSAVE
469	bool "Disable hardware autosave regfile on interrupts"
470	default n
471	help
472	  On HS cores, taken interrupt auto saves the regfile on stack.
473	  This is programmable and can be optionally disabled in which case
474	  software INTERRUPT_PROLOGUE/EPILGUE do the needed work
475
476config ARC_LPB_DISABLE
477	bool "Disable loop buffer (LPB)"
478	help
479	  On HS cores, loop buffer (LPB) is programmable in runtime and can
480	  be optionally disabled.
481
482endif # ISA_ARCV2
483
484endmenu   # "ARC CPU Configuration"
485
486config LINUX_LINK_BASE
487	hex "Kernel link address"
488	default "0x80000000"
489	help
490	  ARC700 divides the 32 bit phy address space into two equal halves
491	  -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
492	  -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
493	  Typically Linux kernel is linked at the start of untransalted addr,
494	  hence the default value of 0x8zs.
495	  However some customers have peripherals mapped at this addr, so
496	  Linux needs to be scooted a bit.
497	  If you don't know what the above means, leave this setting alone.
498	  This needs to match memory start address specified in Device Tree
499
500config LINUX_RAM_BASE
501	hex "RAM base address"
502	default LINUX_LINK_BASE
503	help
504	  By default Linux is linked at base of RAM. However in some special
505	  cases (such as HSDK), Linux can't be linked at start of DDR, hence
506	  this option.
507
508config HIGHMEM
509	bool "High Memory Support"
510	select ARCH_DISCONTIGMEM_ENABLE
511	help
512	  With ARC 2G:2G address split, only upper 2G is directly addressable by
513	  kernel. Enable this to potentially allow access to rest of 2G and PAE
514	  in future
515
516config ARC_HAS_PAE40
517	bool "Support for the 40-bit Physical Address Extension"
518	depends on ISA_ARCV2
519	select HIGHMEM
520	select PHYS_ADDR_T_64BIT
521	help
522	  Enable access to physical memory beyond 4G, only supported on
523	  ARC cores with 40 bit Physical Addressing support
524
525config ARC_KVADDR_SIZE
526	int "Kernel Virtual Address Space size (MB)"
527	range 0 512
528	default "256"
529	help
530	  The kernel address space is carved out of 256MB of translated address
531	  space for catering to vmalloc, modules, pkmap, fixmap. This however may
532	  not suffice vmalloc requirements of a 4K CPU EZChip system. So allow
533	  this to be stretched to 512 MB (by extending into the reserved
534	  kernel-user gutter)
535
536config ARC_CURR_IN_REG
537	bool "Dedicate Register r25 for current_task pointer"
538	default y
539	help
540	  This reserved Register R25 to point to Current Task in
541	  kernel mode. This saves memory access for each such access
542
543
544config ARC_EMUL_UNALIGNED
545	bool "Emulate unaligned memory access (userspace only)"
546	select SYSCTL_ARCH_UNALIGN_NO_WARN
547	select SYSCTL_ARCH_UNALIGN_ALLOW
548	depends on ISA_ARCOMPACT
549	help
550	  This enables misaligned 16 & 32 bit memory access from user space.
551	  Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
552	  potential bugs in code
553
554config HZ
555	int "Timer Frequency"
556	default 100
557
558config ARC_METAWARE_HLINK
559	bool "Support for Metaware debugger assisted Host access"
560	help
561	  This options allows a Linux userland apps to directly access
562	  host file system (open/creat/read/write etc) with help from
563	  Metaware Debugger. This can come in handy for Linux-host communication
564	  when there is no real usable peripheral such as EMAC.
565
566menuconfig ARC_DBG
567	bool "ARC debugging"
568	default y
569
570if ARC_DBG
571
572config ARC_DW2_UNWIND
573	bool "Enable DWARF specific kernel stack unwind"
574	default y
575	select KALLSYMS
576	help
577	  Compiles the kernel with DWARF unwind information and can be used
578	  to get stack backtraces.
579
580	  If you say Y here the resulting kernel image will be slightly larger
581	  but not slower, and it will give very useful debugging information.
582	  If you don't debug the kernel, you can say N, but we may not be able
583	  to solve problems without frame unwind information
584
585config ARC_DBG_TLB_PARANOIA
586	bool "Paranoia Checks in Low Level TLB Handlers"
587
588config ARC_DBG_JUMP_LABEL
589	bool "Paranoid checks in Static Keys (jump labels) code"
590	depends on JUMP_LABEL
591	default y if STATIC_KEYS_SELFTEST
592	help
593	  Enable paranoid checks and self-test of both ARC-specific and generic
594	  part of static keys (jump labels) related code.
595endif
596
597config ARC_BUILTIN_DTB_NAME
598	string "Built in DTB"
599	help
600	  Set the name of the DTB to embed in the vmlinux binary
601	  Leaving it blank selects the minimal "skeleton" dtb
602
603endmenu	 # "ARC Architecture Configuration"
604
605config FORCE_MAX_ZONEORDER
606	int "Maximum zone order"
607	default "12" if ARC_HUGEPAGE_16M
608	default "11"
609
610source "kernel/power/Kconfig"