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* ARC: Add eznps platform to Kconfig and MakefileNoam Camus2016-05-091-0/+5
| | | | | | This commit should be left last since only now eznps platform is in state which one can actually use. Signed-off-by: Noam Camus <noamc@ezchip.com>
* ARC: build: Turn off -Wmaybe-uninitialized for ARC gcc 4.8Vineet Gupta2016-03-181-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | linux-next has been reporting gazillion warnings for ARC build and I finally decided to take a bite: http://kisskb.ellerman.id.au/kisskb/buildresult/12638735/ Most of the them are due to -Wmaybe-uninitialized | ../kernel/sysctl.c: In function '__do_proc_doulongvec_minmax': | ../kernel/sysctl.c:1928:12: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized] | ret = tmp - *buf; | ^ | ../kernel/sysctl.c:2342:29: note: 'p' was declared here | char *kbuf = NULL, *p; | ^ | ... | ... Cursory look at code seemed fine and a definite gcc false positive in say kernel/sysctl.c Mystery was why only for ARC (and not with ARM linaro toolchain based off same gcc 4.8). Turns out that -O3 (default for ARC) triggers these and if I enable -O3 for ARM kernel build, I see the same splat. I initially wanted to disable this only for gcc 4.8, but Arnd reported it is seen even on gcc 6.0 for ARM with -O3. Thus better to disable this independent of gcc version. Cc: Claudiu Zissulescu <Claudiu.Zissulescu@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Michal Marek <mmarek@suse.cz> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: linux-kbuild@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: build: Better way to detect ISA compatible toolchainVineet Gupta2016-03-121-0/+14
| | | | | | | | | | | | | | | | | | | | | | | | | ARC architecture has 2 instruction sets: ARCompact/ARCv2. While same gcc supports compiling for either (using appropriate toggles), we can't use the same toolchain to build kernel because libgcc needs to be unique and the toolchian (uClibc based) is not multilibed. uClibc toolchain is convenient since it allows all userspace and kernel to be built with a single install for an ISA. This however means 2 gnu installs (with same triplet prefix) are needed for building for 2 ISA and need to be in PATH. As developers we keep switching the builds, but would occassionally fail to update the PATH leading to usage of wrong tools. And this would only show up at the end of kernel build when linking incompatible libgcc. So the initial solution was to have gcc define a special preprocessor macro DEFAULT_CPU_xxx which is unique for default toolchain configuration. Claudiu proposed using grep for an existing preprocessor macro which is again uniquely defined per ISA. Cc: Michal Marek <mmarek@suse.cz> Suggested-by: Claudiu Zissulescu <claziss@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [BE] Select correct CROSS_COMPILE prefixVineet Gupta2016-03-111-0/+4
| | | | | | | | | | This allows CONFIG_CPU_BIG_ENDIAN=y to build correctly out of the box, w/o any other tweaks. Cc: Noam Camus <noamc@ezchip.com> Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: Anton Kolesov <akolesov@synosys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Assume multiplier is always presentVineet Gupta2016-02-181-4/+0
| | | | | | | | It is unlikely that designs running Linux will not have multiplier. Further the current support is not complete as tool don't generate a multilib w/o multiplier. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Fix linking errors with CONFIG_MODULE + CONFIG_CC_OPTIMIZE_FOR_SIZEVineet Gupta2015-12-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At -Os, ARC gcc generates millicode thunk for function prologue/epilogue, which are served by libgcc. Modules historically are NOT linked with libgcc to avoid code bloat, reducing runtime relocation fixups etc. I even once tried doing that but got lost in makefile intricacies. This means modules at -Os don't get the millicode thunks, causing build failures below: | MODPOST 5 modules | ERROR: "__ld_r13_to_r18" [crypto/sha256_generic.ko] undefined! | ERROR: "__ld_r13_to_r18_ret" [crypto/sha256_generic.ko] undefined! | ERROR: "__st_r13_to_r18" [crypto/sha256_generic.ko] undefined! | ERROR: "__ld_r13_to_r17_ret" [crypto/sha256_generic.ko] undefined! | ERROR: "__st_r13_to_r17" [crypto/sha256_generic.ko] undefined! | ERROR: "__ld_r13_to_r16_ret" [crypto/sha256_generic.ko] undefined! | ERROR: "__st_r13_to_r16" [crypto/sha256_generic.ko] undefined! |.... |.... Workaround that by inhibiting millicode thunks for loadable modules Fixes STAR 9000641864: ("Linux built with optimizations for size emits errors for modules") Reported-by: Anton Kolesov <akolesov@synosys.com> Cc: Michal Marek <mmarek@suse.cz> Cc: linux-kernel@vger.kernel.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* arc: use common make variables for dtb buildsRob Herring2015-10-271-1/+1
| | | | | | | | Use dtb-y and always make variables to build dtbs instead of explicit dtbs rule. This is in preparation to support building all dtbs. Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: add knob for DIV_REV in KconfigAlexey Brodkin2015-07-201-1/+9
| | | | | | | | | | | | | Being highly configurable core ARC HS among other features might be configured with or without DIV_REM_OPTION (hardware divider). That option when enabled adds following instructions: div, divu, rem, remu. By default ARC HS38 has this option enabled. So we add here possibility to disable usage of hardware divider by compiler. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Override toplevel default -O2 with -O3Vineet Gupta2015-07-061-1/+2
| | | | | | | | | | | | | | | | | | | ARC kernels have historically been built with -O3, despite top level Makefile defaulting to -O2. This was facilitated by implicitly ordering of arch makefile include AFTER top level assigned -O2. An upstream fix to top level a1c48bb160f ("Makefile: Fix unrecognized cross-compiler command line options") changed the ordering, making ARC -O3 defunct. Fix that by NOT relying on any ordering whatsoever and use the proper arch override facility now present in kbuild (ARCH_*FLAGS) Depends-on: ("kbuild: Allow arch Makefiles to override {cpp,ld,c}flags") Suggested-by: Michal Marek <mmarek@suse.cz> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: stable@vger.kernel.org # 3.16+ Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Fix build failures for ARCompact in linux-next after ARCv2 supportVineet Gupta2015-06-281-2/+2
| | | | | Reported-by: Guenter Roeck <private@roeck-us.net> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: Allow older gcc to cope with new regime of ARCv2/ARCompact supportVineet Gupta2015-06-281-1/+1
| | | | | | | | | | | -no-ll64 is specific to ARCv2 ISA, and is obviously not supported by older ARC gcc - in this case the one hosted by linux-next sanity build service. Ensure that it doesn't get included for ISA_ARCOMPACT Reported-by: Guenter Roeck <private@roeck-us.net> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: Support for ARCv2 ISA and HS38x coresVineet Gupta2015-06-221-1/+7
| | | | | | | | | | | | | | | | | | The notable features are: - SMP configurations of upto 4 cores with coherency - Optional L2 Cache and IO-Coherency - Revised Interrupt Architecture (multiple priorites, reg banks, auto stack switch, auto regfile save/restore) - MMUv4 (PIPT dcache, Huge Pages) - Instructions for * 64bit load/store: LDD, STD * Hardware assisted divide/remainder: DIV, REM * Function prologue/epilogue: ENTER_S, LEAVE_S * IRQ enable/disable: CLRI, SETI * pop count: FFS, FLS * SETcc, BMSKN, XBFU... Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [axs101] Add support for AXS101 SDP (software development platform)Alexey Brodkin2015-06-191-0/+1
| | | | | | | | | | The AXS10x platforms consist of a mainboard with peripherals, on which several daughter cards can be placed. The daughter cards typically contain a CPU and memory. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [plat_arcfpga]->[plat_sim]Vineet Gupta2015-06-191-2/+2
| | | | | | | | * Remove remanants of legacy ARC FPGA platforms (AA4, ML509...) * Only nsim simulation platform is left, rename platform accordingly * AA4 DT stuff is compatible with nsim for ARC700 so rename it too Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: RIP broken 64bit RTSCVineet Gupta2015-06-191-1/+1
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: switch to simpler CROSS_COMPILE prefixVineet Gupta2015-05-191-1/+1
| | | | | | | | ARC GNU tools have had support for arc-linux-* driver for some time now. This is functionally similar to arc-linux-uclibc-* but uclibc prefix seemed weird at best when trying to compile the kernel itself. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: rename default defconfigVineet Gupta2014-12-171-1/+1
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: remove gcc mpy heuristicsVineet Gupta2014-10-131-16/+1
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Adjustments for gcc 4.8Vineet Gupta2013-06-271-8/+16
| | | | | | | | | | | | | | | | * DWARF unwinder related + Force DWARF2 compliant .debug_frame (gcc 4.8 defaults to DWARF4 which kernel unwinder can't grok). + Discard the additional .eh_frame generated + Discard the dwarf4 debug info generated by -gdwarf-2 for normal no debug case * 4.8 already uses arc600 multilibs for -mno-mpy * switch to using uclibc compiler (to get -mmedium-calls and -mno-sdata) and also since buildroot can only use 1 toolchain Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Use kconfig helper IS_ENABLED() to get rid of defines.hVineet Gupta2013-06-221-3/+1
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [TB10x] Add support for TB10x platformChristian Ruppert2013-05-071-0/+1
| | | | | | | | | | | Infrastructure required to make the Linux kernel compile and boot on the Abilis Systems TB10x series of SOCs based on ARC700 CPUs: - Kmake related files (Kconfig, Makefile, tb10x_defconfig) - TB10x platform initialisation Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Pierrick Hascoet <pierrick.hascoet@abilis.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [build] Allow uncompressed uImageVineet Gupta2013-04-091-2/+3
| | | | | | | | | | | The existing uImage target always generates gzip compressed image which drags bootup for some very slow FPGA customer boards. So introduce seperate make targets:uImage.{bin,gz} with uncompressed being default. Also tie gz generation to CONFIG_KERNEL_GZIP, which a platform can select in it's Kconfig if it wishes gz to be default. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [build] cleanup Makefile a bitVineet Gupta2013-04-091-2/+3
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [build] silence make defconfig warnings with host gcc 4.7Vineet Gupta2013-04-091-0/+4
| | | | | | | | | | | | | | | | | | | | We do cross compiles for ARC Linux. With gcc 4.7, a make defconfig spews out the following: ------------------->8-------------------------- make ARCH=arc defconfig gcc: error: unrecognized command line option '-marc600' gcc: error: unrecognized command line option '-mA7' gcc: error: unrecognized command line option '-mno-sdata' gcc: error: unrecognized command line option '-mno-mpy' *** Default configuration is based on 'fpga_defconfig' ------------------->8-------------------------- This apparently is coming from LIBGCC line - which is strange to be invoked for defconfig generation. Reported-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [Review] Multi-platform image #4: Isolate platform headersVineet Gupta2013-02-151-15/+1
| | | | | | | | | | | | | | -Top level ARC makefile removes -I for platform headers -asm/irq.h no longer includes plat/irq.h -platform makefile adds -I for it's specfic platform headers -platform code to directly include it's plat/irq.h -Linker script needed plat/memmap.h for CCM info, already in .config Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Arnd Bergmann <arnd@arndb.de>
* ARC: Boot #2: Verbose Boot reporting / feature verificationVineet Gupta2013-02-151-0/+2
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: SMP supportVineet Gupta2013-02-151-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ARC common code to enable a SMP system + ISS provided SMP extensions. ARC700 natively lacks SMP support, hence some of the core features are are only enabled if SoCs have the necessary h/w pixie-dust. This includes: -Inter Processor Interrupts (IPI) -Cache coherency -load-locked/store-conditional ... The low level exception handling would be completely broken in SMP because we don't have hardware assisted stack switching. Thus a fair bit of this code is repurposing the MMU_SCRATCH reg for event handler prologues to keep them re-entrant. Many thanks to Rajeshwar Ranga for his initial "major" contributions to SMP Port (back in 2008), and to Noam Camus and Gilad Ben-Yossef for help with resurrecting that in 3.2 kernel (2012). Note that this platform code is again singleton design pattern - so multiple SMP platforms won't build at the moment - this deficiency is addressed in subsequent patches within this series. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Gilad Ben-Yossef <gilad@benyossef.com>
* ARC: OProfile supportVineet Gupta2013-02-151-0/+2
| | | | | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Robert Richter <rric@kernel.org> Cc: oprofile-list@lists.sf.net Reviewed-by: James Hogan <james.hogan@imgtec.com>
* ARC: [optim] Cache "current" in Register r25Vineet Gupta2013-02-151-0/+9
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [DeviceTree] Basic supportVineet Gupta2013-02-151-0/+9
| | | | | | | | | | | | | | | | | | | | This is minimal infrastructure needed for devicetree work. It uses an a sample "skeleton" devicetree - embedded in kernel image - to print the board, manufacturer by parsing the top-level "compatible" string. As of now we don't need any additional "board" specific "machine_desc". TODO: support interpreting the command line as boot-loader passed dtb Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: James Hogan <james.hogan@imgtec.com> Reviewed-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: James Hogan <james.hogan@imgtec.com>
* ARC: Build system: Makefiles, Kconfig, Linker scriptVineet Gupta2013-02-111-0/+115
Arnd in his review pointed out that arch Kconfig organisation has several deficiencies: * Build time entries for things which can be runtime extracted from DT (e.g. SDRAM size, core clk frequency..) * Not multi-platform-image-build friendly (choice .. endchoice constructs) * cpu variants support (750/770) is exclusive. The first 2 have been fixed in subsequent patches. Due to the nature of the 750 and 770, it is not possible to build for both together, w/o special runtime glue code which would hurt performance. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Sam Ravnborg <sam@ravnborg.org>
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