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2014-08-09Merge tag 'arc-v3.17-rc1' of ↵Linus Torvalds4-31/+1
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC changes from Vineet Gupta: "Mostly cleanup/refactoring in core intc, cache flush, IPI send..." * tag 'arc-v3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: mm, arc: remove obsolete pagefault oom killer comment ARC: help gcc elide icache helper for !SMP ARC: move common ops for line/full cache into helpers ARC: cache boot reporting updates ARC: [intc] mask/unmask can be hidden again ARC: [plat-arcfpga] No need for init_irq hack ARC: [intc] don't mask all IRQ by default ARC: prune extra header includes from smp.c ARC: update some comments ARC: [SMP] unify cpu private IRQ requests (TIMER/IPI)
2014-07-23ARC: [plat-arcfpga] No need for init_irq hackVineet Gupta4-31/+1
With all IRQs unmasked by default on all cores, it is no longer needed to unmask them explicitly. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-07-10ARC: [arcfpga] RIP early uart platform device stuffVineet Gupta2-102/+2
With ARC uart driver switching to generic earlycon, we no longer need this ugliness. You won't be missed. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-06-03ARC: [arcfpga] Early ARC UART to be only activated by cmdlineVineet Gupta1-9/+4
Earlier CONFIG_SERIAL_ARC_CONSOLE would unconditionally enable the legacy ARC UART based early console even if platform lacked that UART (e.g. nSIM OSCI platform). So a multi-platform image containing the 2 UART drivers won't work. Fix that by probing the driver only if "earlyprintk=ttyARC0" is present in cmdline. Reported-by: Chuck Jordan <cjordan@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-03ARC: [arcfpga] Get rid of legacy BVCI latency unit supportVineet Gupta2-87/+0
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-05-05ARC: [SMP] ISS SMP extension bitrotVineet Gupta3-3/+21
* Move extension specific code out of common SMP code * Don't enable it by default for SMP Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-03-26ARC: Remove ARC_HAS_COH_RTSCRichard Weinberger1-1/+0
The symbol is an orphan, get rid of it. Fixes: 7d0857a54aed ("ARC: [SMP] Disallow RTSC") Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-03-26ARC: [arcfpga] Fix __initconst data const-correctnessMischa Jonker1-3/+3
Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23ARC: [SMP] IPI ACK interface doesn't need "self" cpu-idVineet Gupta1-2/+2
The interface is confusing, it feels like we are getting "sender" info, whereas it is the "receiver", which can very well be retrived by smp_processor_id(), if need be. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23ARC: [SMP] cpumask not needed in IPI send pathVineet Gupta1-6/+2
The current IPI sending callstack needlessly involves cpumask. arch_send_call_function_single_ipi(cpu) / smp_send_reschedule(cpu) ipi_send_msg(cpumask_of(cpu)) --> [cpu to cpumask] plat_smp_ops.ipi_send(callmap) for_each_cpu(callmap) --> [cpuask to cpu] do_plat_specific_ipi_PER_CPU Given that current backends are not capable of 1:N IPIs, lets simplify the interface for now, by keeping "a" cpu all along. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-07-10Merge tag 'arc-v3.11-rc1-part2' of ↵Linus Torvalds2-4/+0
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull second set of ARC architecture updates from Vineet Gupta: "Couple of Platform updates (Device Tree files primarily) given that the corresponding drivers (net/ethernet/arc/*, irqctl/irq-tb10x.c) have now been merged into your tree. Ideally these shd have been part of same submissions, oh well..." * tag 'arc-v3.11-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: [TB10x] Updates for irqchip driver ARC: [plat-arcfpga] Enable arc_emac for ARCAngle4 Board
2013-06-28ARC: [plat-arcfpga] Enable arc_emac for ARCAngle4 BoardAlexey Brodkin2-4/+0
* Add arc_emac to DeviceTree DT description "Documentation/devicetree/bindings/net/arc_emac.txt". * Update defconfig correspondingly [vgupta: tweaked changelog] Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-06-22ARC: [plat-arcfpga] Fix build breakage when !CONFIG_ARC_SERIALMischa Jonker1-3/+9
This fixes the following: - CONFIG_ARC_SERIAL_BAUD is only defined when CONFIG_SERIAL_ARC is defined. Make sure that it isn't referenced otherwise. - There is no use for initializing arc_uart_info[] when CONFIG_SERIAL_ARC is not defined. [vgupta: tweaked changelog title, used IS_ENABLED() kconfig helper] Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-09Merge tag 'arc-v3.10-rc1-part1' of ↵Linus Torvalds1-0/+12
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC port updates from Vineet Gupta: "Support for two new platforms based on ARC700: - Abilis TB10x SoC [Chritisian/Pierrick] - Simulator only System-C Model [Mischa] ARC specific MM improvements: - Avoid full TLB flush (ASID increment) on munmap (even single page) - VIPT Cache Flushing improvements + Delayed dcache flush for non-aliasing dcache (big performance boost) + icache flush aliasing agnostic (no need to kill all possible aliases) Others: - Avoid needless rebuild of DTB files for every kernel build - Remove builtin cmdline as that is already provided by DeviceTree/bootargs - Fixing unaligned access emulation corner case - checkpatch fixes [Sachin] - Various fixlets [Noam] - Minor build failures/cleanups" * tag 'arc-v3.10-rc1-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (35 commits) ARC: [mm] Lazy D-cache flush (non aliasing VIPT) ARC: [mm] micro-optimize page size icache invalidate ARC: [mm] remove the pessimistic all-alias-invalidate icache helpers ARC: [mm] consolidate icache/dcache sync code ARC: [mm] optimise icache flush for kernel mappings ARC: [mm] optimise icache flush for user mappings ARC: [mm] optimize needless full mm TLB flush on munmap ARC: Add support for nSIM OSCI System C model ARC: [TB10x] Adapt device tree to new compatible string ARC: [TB10x] Add support for TB10x platform ARC: [TB10x] Device tree of TB100 and TB101 Development Kits ARC: Prepare interrupt code for external controllers ARC: Allow embedded arc-intc to be properly placed in DT intc hierarchy ARC: [cmdline] Don't overwrite u-boot provided bootargs ARC: [cmdline] Remove CONFIG_CMDLINE ARC: [plat-arcfpga] defconfig update ARC: unaligned access emulation broken if callee-reg dest of LD/ST ARC: unaligned access emulation error handling consolidation ARC: Debug/crash-printing Improvements ARC: fix typo with clock speed ...
2013-05-07ARC: Add support for nSIM OSCI System C modelMischa Jonker1-0/+12
This adds support for an ARC Virtual Platform. This platform is based on the System C standard promoted by the OSCI (Open System C Initiative) and uses nSIM to simulate the ARC CPU core itself. Users can build a virtual SoC by combining System C models of peripherals and CPU cores. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-03-18treewide: Fix typos in printk and commentMasanari Iida1-1/+1
Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2013-02-15ARC: [Review] Multi-platform image #8: platform registers SMP callbacksVineet Gupta3-18/+28
Platforms export their SMP callbacks by populating arc_smp_ops. The population itself needs to be done pretty early, from init_early callback. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optionalVineet Gupta1-45/+0
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: [Review] Multi-platform image #5: NR_IRQS defined by ARC coreVineet Gupta1-6/+0
For now this will suffice for all platforms, later exotic ones needs to get this from DeviceTree Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: [Review] Multi-platform image #4: Isolate platform headersVineet Gupta4-3/+6
-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>
2013-02-15ARC: [Review] Multi-platform image #3: switch to board callbackVineet Gupta5-12/+48
-platform API is retired and instead callbacks are used 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 Gupta1-5/+11
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 Gupta1-3/+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: [plat-arfpga] BVCI Latency Unit setupVineet Gupta2-0/+88
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-02-15ARC: SMP supportVineet Gupta6-1/+316
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>
2013-02-15ARC: [plat-arcfpga]: Enabling DeviceTree for Angel4 boardVineet Gupta1-51/+46
* arc-uart platform device now populated dynamically, using of_platform_populate() - applies to any other device whatsoever. * uart in turn requires incore arc-intc to be also present in DT * A irq-domain needs to be instantiated for IRQ requests by DT probed device (e.g. arc-uart) TODO: switch over to linear irq domain once all devs have been transitioned to DT Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: [plat-arcfpga] Static platform device for CONFIG_SERIAL_ARCVineet Gupta3-0/+166
N.B. This is old style of hardcoding platform device specific info in code and it's instantiation thererof using platform_add_devices(). Subsequent patches replace this with DeviceTree based runtime probe. This patch has been retained just as an example of "don't-do-this" for newer kernel ports. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: Boot #1: low-level, setup_arch(), /proc/cpuinfo, mem initVineet Gupta1-0/+29
Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2013-02-15ARC: I/O and DMA MappingsVineet Gupta1-0/+45
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-02-11ARC: Interrupt HandlingVineet Gupta1-0/+15
This contains: -bootup arch IRQ init: init_IRQ(), arc_init_IRQ() -generic IRQ subsystem glue: arch_do_IRQ() -basic IRQ chip setup for in-core intc Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Thomas Gleixner <tglx@linutronix.de>
2013-02-11ARC: Build system: Makefiles, Kconfig, Linker scriptVineet Gupta2-0/+42
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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