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2015-07-06ARC: Kconfig: better way to disable ARC_HAS_LLSC for ARC_CPU_750DVineet Gupta1-1/+2
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-25ARCv2: All bits in place, allow ARCv2 buildsVineet Gupta1-5/+4
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: SMP: clocksource: Enable Global Real Time counterVineet Gupta1-0/+5
Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: SMP: ARConnect debug/robustnessVineet Gupta1-3/+12
- Handle possible interrupt coalescing from MCIP - chk if prev IPI ack before sending new Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: SMP: Support ARConnect (MCIP) for Inter-Core-Interrupts et alVineet Gupta1-7/+14
Cc: Jason Cooper <jason@lakedaemon.net> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: clocksource: Introduce 64bit local RTC counterVineet Gupta1-0/+5
Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: MMUv4: cache programming model changesVineet Gupta1-1/+1
Caveats about cache flush on ARCv2 based cores - dcache is PIPT so paddr is sufficient for cache maintenance ops (no need to setup PTAG reg - icache is still VIPT but only aliasing configs need PTAG setup So basically this is departure from MMU-v3 which always need vaddr in line ops registers (DC_IVDL, DC_FLDL, IC_IVIL) but paddr in DC_PTAG, IC_PTAG respectively. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: MMUv4: TLB programming Model changesVineet Gupta1-0/+5
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: Support for ARCv2 ISA and HS38x coresVineet Gupta1-5/+75
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>
2015-06-19ARC: [axs101] Add support for AXS101 SDP (software development platform)Alexey Brodkin1-0/+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>
2015-06-19ARC: explicit'ify uboot supportVineet Gupta1-0/+12
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [plat_arcfpga]->[plat_sim]Vineet Gupta1-1/+1
* 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>
2015-06-19ARC: RIP broken 64bit RTSCVineet Gupta1-5/+0
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [kbuild] Retire CONFIG_ARC_CPU_REL_4_10Vineet Gupta1-10/+1
Back when ARC700 4.10 was released, the related kernel features were tied to this config item so they could be disabled in one shot (i.e. LLOCK/SCOND, SWAPE, RTSC..) That having happened a while back, all new ARC customers weill get 4.11+ so those features can be assumed to be present and need not be tied to a top-level (we still retain the ability to individually disable them). Further, since ARCv2 also shares some of those feautes, removing it simplifies things a bit in Kconfig Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: remove the unused platform helpers from dma mapping APIVineet Gupta1-4/+0
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-11-03ARC: add power management optionsAlexey Brodkin1-0/+1
Even though ARC cores itself don't have any power management except SLEEP state it's possible to use power management features of selected peripherals. For example USB OTG requires PM_RUNTIME which is only available if kernel/power/Kconfig is sourced by architecture. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-10-13ARC: Remove unneeded Kconfig entry NO_DMAPaul Bolle1-3/+0
Architectures only need a Kconfig entry for NO_DMA if it is possible that its value will be 'y'. For arc its value will always be 'n', making it pointless. Remove it. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-10-13ARC: rename kconfig option for unaligned emulationVineet Gupta1-1/+1
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-10-13ARC: [plat*] move code out of .init_machine into commonVineet Gupta1-0/+1
All the platforms do the same thing in init_machine callback so move it out of callback into caller of callback Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-04-08Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAPUwe Kleine-König1-1/+1
If the renamed symbol is defined lib/iomap.c implements ioport_map and ioport_unmap and currently (nearly) all platforms define the port accessor functions outb/inb and friend unconditionally. So HAS_IOPORT_MAP is the better name for this. Consequently NO_IOPORT is renamed to NO_IOPORT_MAP. The motivation for this change is to reintroduce a symbol HAS_IOPORT that signals if outb/int et al are available. I will address that at least one merge window later though to keep surprises to a minimum and catch new introductions of (HAS|NO)_IOPORT. The changes in this commit were done using: $ git grep -l -E '(NO|HAS)_IOPORT' | xargs perl -p -i -e 's/\b((?:CONFIG_)?(?:NO|HAS)_IOPORT)\b/$1_MAP/' Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-20Merge branch 'master' into for-nextJiri Kosina1-13/+2
2014-02-20Kconfig: Remove useless "default N" linesPaul Bolle1-1/+0
A number of Kconfig entries default to (uppercase) "N". It was clearly intended to use "default n". But since (lowercase) "n" is the default anyway, these lines might as well be removed. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-01-25Merge tag 'arc-v3.14-rc1' of ↵Linus Torvalds1-11/+0
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC changes from Vineet Gupta: - IPI optimization and cleanups - Support for bootloader provided external Device Tree blobs * tag 'arc-v3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: [cmdline] support External Device Trees from u-boot ARC: [cmdline] uboot cmdline handling rework ARC: [SMP] optimize IPI send and receive ARC: [SMP] simplify IPI code ARC: [SMP] cpu halt interface doesn't need "self" cpu-id ARC: [SMP] IPI ACK interface doesn't need "self" cpu-id ARC: [SMP] cpumask not needed in IPI send path
2014-01-24Kconfig: update flightly outdated CONFIG_SMP documentationRobert Graffham1-2/+2
Remove an outdated reference to "most personal computers" having only one CPU, and change the use of "singleprocessor" and "single processor" in CONFIG_SMP's documentation to "uniprocessor" across all arches where that documentation is present. Signed-off-by: Robert Graffham <psquid@psquid.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-16ARC: [cmdline] uboot cmdline handling reworkVineet Gupta1-11/+0
* Moved cmdline copy from asm to "C" - allows for more robust checking of pointer validity etc. * Remove the Kconfig option to do so, base it on a runtime value passed by u-boot Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-25ARC: extable: Enable sorting at build timeVineet Gupta1-0/+1
Avoids wasting cycles at boot specially on slower simulators Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Michal Marek <mmarek@suse.cz> Cc: Francois Bedard <fbedard@synopsys.com> Cc: linux-kernel@vger.kernel.org Acked-by: David Daney <david.daney@cavium.com>
2013-11-15kernel: remove CONFIG_USE_GENERIC_SMP_HELPERSChristoph Hellwig1-1/+0
We've switched over every architecture that supports SMP to it, so remove the new useless config variable. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-07ARC: [SMP] Disallow RTSCVineet Gupta1-5/+1
RTSC is strictly incore and must not be allowed in SMP configs Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: [SMP] enlarge possible NR_CPUSNoam Camus1-2/+2
Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: Add support for irqflags tracing and lockdepVineet Gupta1-0/+6
Lockdep required a small fix to stacktrace API which was incorrectly unwindign out of __switch_to for the current call frame. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-09-13Remove GENERIC_HARDIRQ config optionMartin Schwidefsky1-1/+0
After the last architecture switched to generic hard irqs the config options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code for !CONFIG_GENERIC_HARDIRQS can be removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-07-04Merge branch 'kconfig-diet' from Dave HansenLinus Torvalds1-0/+1
Merge Kconfig menu diet patches from Dave Hansen: "I think the "Kernel Hacking" menu has gotten a bit out of hand. It is over 120 lines long on my system with everything enabled and options are scattered around it haphazardly. http://sr71.net/~dave/linux/kconfig-horror.png Let's try to introduce some sanity. This set takes that 120 lines down to 55 and makes it vastly easier to find some things. It's a start. This set stands on its own, but there is plenty of room for follow-up patches. The arch-specific debug options still end up getting stuck in the top-level "kernel hacking" menu. OPTIMIZE_INLINING, for instance, could obviously go in to the "compiler options" menu, but the fact that it is defined in arch/ in a separate Kconfig file keeps it on its own for the moment. The Signed-off-by's in here look funky. I changed employers while working on this set, so I have signoffs from both email addresses" * emailed patches from Dave Hansen <dave@sr71.net>: hang and lockup detection menu kconfig: consolidate printk options group locking debugging options consolidate compilation option configs consolidate runtime testing configs order memory debugging Kconfig options consolidate per-arch stack overflow debugging options
2013-07-04consolidate per-arch stack overflow debugging optionsDave Hansen1-0/+1
Original posting: http://lkml.kernel.org/r/20121214184202.F54094D9@kernel.stglabs.ibm.com Several architectures have similar stack debugging config options. They all pretty much do the same thing, some with slightly differing help text. This patch changes the architectures to instead enable a Kconfig boolean, and then use that boolean in the generic Kconfig.debug to present the actual menu option. This removes a bunch of duplication and adds consistency across arches. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Reviewed-by: H. Peter Anvin <hpa@zytor.com> Reviewed-by: James Hogan <james.hogan@imgtec.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [for tile] Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-06-22ARC: [mm] Make stack/heap Non-executable by defaultVineet Gupta1-7/+0
1. For VM_EXEC based delayed dcache/icache flush, reduces the number of flushes. 2. Makes this security feature ON by default rather than OFF before. 3. Applications can use mprotect() to selectively override this. 4. ELF binaries have a GNU_STACK segment which can easily override the kernel default permissions. For nested-functions/trampolines, gcc already auto-enables executable stack in elf. Others needing this can use -Wl,-z,execstack option. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-06-22ARC: make dcache VIPT aliasing support dependant on dcacheAlexey Brodkin1-0/+1
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-09ARC: [mm] Aliasing VIPT dcache support 2/4Vineet Gupta1-0/+4
This is the meat of the series which prevents any dcache alias creation by always keeping the U and K mapping of a page congruent. If a mapping already exists, and other tries to access the page, prev one is flushed to physical page (wback+inv) Essentially flush_dcache_page()/copy_user_highpage() create K-mapping of a page, but try to defer flushing, unless U-mapping exist. When page is actually mapped to userspace, update_mmu_cache() flushes the K-mapping (in certain cases this can be optimised out) Additonally flush_cache_mm(), flush_cache_range(), flush_cache_page() handle the puring of stale userspace mappings on exit/munmap... flush_anon_page() handles the existing U-mapping for anon page before kernel reads it via the GUP path. Note that while not complete, this is enough to boot a simple dynamically linked Busybox based rootfs Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-07ARC: [TB10x] Add support for TB10x platformChristian Ruppert1-0/+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>
2013-05-07ARC: [cmdline] Remove CONFIG_CMDLINEVineet Gupta1-9/+2
Given that DeviceTree /bootargs can provide similar functionality, no point in providing duplicate infrastructure. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-07ARC: Remove non existent refs to GENERIC_KERNEL_EXECVE & GENERIC_KERNEL_THREADAlexander Shiyan1-2/+0
This tracks mainline commit ae903caae267 "Bury the conditionals from kernel_thread/kernel_execve series" which we missed out as ARC port was not yet mainline. [vgupta: commit log modified] Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-04-09ARC: [kbuild] Include Kconfig.binfmtVineet Gupta1-3/+4
commit "fs: make binfmt support for #! scripts modular and removable" made support for #!scripts optional - thus need to include the Kconfig file to get all relevant BINFMT_* Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-04-09ARC: [kbuild] Allow platforms to disable LLSC for !SMP as wellVineet Gupta1-6/+4
Currently ARC_HAS_LLSC can be influenced by platform for SMP only using ARC_HAS_COH_LLSC. For !SMP it defaults to "y". It turns out that some customers can't support it all, even in UP. So we change the semantics, and use a negative dependency ARC_CANT_LLSC. Any platform (independent of SMP or !SMP) can select it to disable LLSC. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-02-26ARC: Kconfig cleanup tracking cross-arch Kconfig pruning in merge windowVineet Gupta1-5/+0
Since ARC port was not yet upstream, we missed a bunch of cross-arch Kconfig removals: * GENERIC_SIGALTSTACK: d64008a8f3 "burying unused conditionals" * HAVE_IRQ_WORK: 6147a9d807 "irq_work: Remove CONFIG_HAVE_IRQ_WORK" * ARCH_NO_VIRT_TO_BUS: e0cf2ef484 "arch Kconfig: centralise CONFIG_ARCH_NO_VIRT_TO_BUS" Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-02-15ARC: Ensure CONFIG_VIRT_TO_BUS is not enabledVineet Gupta1-1/+3
Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Reported-by: James Hogan <james.hogan@imgtec.com>
2013-02-15ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optionalVineet Gupta1-0/+4
All the current platforms can work with 0x8000_0000 based dma_addr_t since the Bus Bridges typically ignore the top bit (the only excpetion was Angel4 PCI-AHB bridge which we no longer care for). That way we don't need plat-specific cpu-addr to bus-addr conversion. Hooks still provided - just in case a platform has an obscure device which say needs 0 based bus address. That way <asm/dma_mapping.h> no longer needs to unconditinally include <plat/dma_addr.h> Also verfied that on Angel4 board, other peripherals (IDE-disk / EMAC) work fine with 0x8000_0000 based dma addresses. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: Fold boards sub-menu into platform/SoC menuVineet Gupta1-18/+3
This is more natural and is now doable since the choice constructs are gone. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: [Review] Multi-platform image #1: Kconfig enablementVineet Gupta1-4/+2
This mini patchseries addresses the lack of multi-platform-image support in ARC port. Older build system only supported one platform(soc) to build at a time and further only one board of that platform could be built. There was no technical reason for that - we just didn't have the need. So the first step towards multi-platform (and multi-board) builds it to allow build system to do that. So as applicable, <choice .. endchoice> => <menu .. endmenu> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: Add support for ioremap_prot APIGilad Ben-Yossef1-0/+1
Implement ioremap_prot() to allow mapping IO memory with variable protection via TLB. Implementing this allows the /dev/mem driver to use its generic access() VMA callback, which in turn allows ptrace to examine data in memory mapped regions mapped via /dev/mem, such as Arc DCCM. The end result is that it is possible to examine values of variables placed into DCCM in user space programs via GDB. CC: Alexey Brodkin <Alexey.Brodkin@synopsys.com> CC: Noam Camus <noamc@ezchip.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-02-15ARC: Hostlink Pseudo-Driver for Metaware DebuggerVineet Gupta1-0/+9
This allows ARC Target to do I/O to host in absence of any peripherals whatsoever, assisted by Metaware Hostlink facility. Further we have a FUSE based filesystem which makes us mount/access host filesystem on target and do fops. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-02-15ARC: Support for single cycle Close Coupled Mem (CCM)Vineet Gupta1-0/+27
* Includes mapping of CCMs in address space * Annotations to move arbitrary code/data into CCM * Moving some of the critical code/data into CCM * Runtime detection/reporting Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-02-15ARC: perf support (software counters only)Vineet Gupta1-0/+3
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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