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* ARC: Support syscall ABI v4Vineet Gupta2016-08-191-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | The syscall ABI includes the gcc functional calling ABI since a syscall implies userland caller and kernel callee. The current gcc ABI (v3) for ARCv2 ISA required 64-bit data be passed in even-odd register pairs, (potentially punching reg holes when passing such values as args). This was partly driven by the fact that the double-word LDD/STD instructions in ARCv2 expect the register alignment and thus gcc forcing this avoids extra MOV at the cost of a few unused register (which we have plenty anyways). This however was rejected as part of upstreaming gcc port to HS. So the new ABI v4 doesn't enforce the even-odd reg restriction. Do note that for ARCompact ISA builds v3 and v4 are practically the same in terms of gcc code generation. In terms of change management, we infer the new ABI if gcc 6.x onwards is used for building the kernel. This also needs a stable backport to enable older kernels to work with new tools/user-space Cc: <stable@vger.kernel.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* Merge tag 'devicetree-for-4.8' of ↵Linus Torvalds2016-07-301-7/+0
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull DeviceTree updates from Rob Herring: - remove most of_platform_populate() calls in arch code. Now the DT core code calls it in the default case and platforms only need to call it if they have special needs - use pr_fmt on all the DT core print statements - CoreSight binding doc improvements to block name descriptions - add dt_to_config script which can parse dts files and list corresponding kernel config options - fix memory leak hit with a PowerMac DT - correct a bunch of STMicro compatible strings to use the correct vendor prefix - fix DA9052 PMIC binding doc to match what is actually used in dts files * tag 'devicetree-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (35 commits) documentation: da9052: Update regulator bindings names to match DA9052/53 DTS expectations xtensa: Partially Revert "xtensa: Remove unnecessary of_platform_populate with default match table" xtensa: Fix build error due to missing include file MIPS: ath79: Add missing include file Fix spelling errors in Documentation/devicetree ARM: dts: fix STMicroelectronics compatible strings powerpc/dts: fix STMicroelectronics compatible strings Documentation: dt: i2c: use correct STMicroelectronics vendor prefix scripts/dtc: dt_to_config - kernel config options for a devicetree of: fdt: mark unflattened tree as detached of: overlay: add resolver error prints coresight: document binding acronyms Documentation/devicetree: document cavium-pip rx-delay/tx-delay properties of: use pr_fmt prefix for all console printing of/irq: Mark initialised interrupt controllers as populated of: fix memory leak related to safe_name() Revert "of/platform: export of_default_bus_match_table" of: unittest: use of_platform_default_populate() to populate default bus memory: omap-gpmc: use of_platform_default_populate() to populate default bus bus: uniphier-system-bus: use of_platform_default_populate() to populate default bus ...
| * arc: Remove unnecessary of_platform_populate with default match tableKefeng Wang2016-06-231-7/+0
| | | | | | | | | | | | | | | | | | | | | | After patch "of/platform: Add common method to populate default bus", it is possible for arch code to remove unnecessary callers of of_platform_populate with default match table. Acked-by: Vineet Gupta <vgupta@synopsys.com> Cc: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Rob Herring <robh@kernel.org>
* | ARC: fix linux-next build breakageVineet Gupta2016-07-131-0/+1
|/ | | | | | | | | | ~/linux/arch/arc/kernel/setup.c: In function show_cpuinfo: | ~/linux/arch/arc/kernel/setup.c:463:9: error: implicit declaration of function of_find_node_by_name [-Werror=implicit-function-declaration] | struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk"); Reported-by: Anton Kolesov <akolesov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* Fix typosAndrea Gelmini2016-05-301-1/+1
| | | | | Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Don't try to use value of top level clock-frequency in DTAlexey Brodkin2016-05-091-5/+7
| | | | | | | | | We no longer use it and instead a real clk device such as fixed-clk instance is fed to timers etc. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> [vgupta: broken out of a bigger patch, rewrote changelog] Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: clocksource: DT based probeVineet Gupta2016-05-091-3/+0
| | | | | | | | | | | | | | | | | | | | - Remove explicit clocksource setup and let it be done by OF framework by defining CLOCKSOURCE_OF_DECLARE() for various timers - This allows multiple clocksources to be potentially registered simultaneouly: previously we could only do one - as all of them had same arc_counter_setup() routine for registration - Setup routines also ensure that the underlying timer actually exists. - Remove some of the panic() calls if underlying timer is NOT detected as fallback clocksource might still be available 1. If GRFC doesn't exist, jiffies clocksource gets registered anyways 2. if RTC doesn't exist, TIMER1 can take over (as it is always present) Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: clockevent: Prepare for DT based probeNoam Camus2016-05-091-2/+0
| | | | | | | | | | - call clocksource_probe() - This in turns needs of_clk_init() to be called earlier Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Noam Camus <noamc@ezchip.com> [vgupta: broken off from a bigger patch] Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: ioremap: Support dynamic peripheral address spaceVineet Gupta2016-03-191-12/+2
| | | | | | | | | | | | | | | | | | The peripheral address space is architectural address window which is uncached and typically used to wire up peripherals. For ARC700 cores (ARCompact ISA based) this was fixed to 1GB region 0xC000_0000 - 0xFFFF_FFFF. For ARCv2 based HS38 cores the start address is flexible and can be 0xC, 0xD, 0xE, 0xF 000_000 by programming AUX_NON_VOLATILE_LIMIT reg (typically done in bootloader) Further in cas of PAE, the physical address can extend beyond 4GB so need to confine this check, otherwise all pages beyond 4GB will be treated as uncached Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* arc: use of_platform_default_populate() to populate default busKefeng Wang2016-03-171-1/+1
| | | | | | | | | Use helper of_platform_default_populate() in linux/of_platform when possible, instead of calling of_platform_populate() with the default match table. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: LLSC: software backoff is NOT needed starting HS2.1cVineet Gupta2016-03-151-5/+0
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: boot report CCMs (Closely Coupled Memories)Vineet Gupta2016-02-181-28/+50
| | | | | | | | | - ARCv2 uses a seperate BCR for {I,D}CCM base address: ARCompact encoded both base/size in same BCR - Size encoding in common BCR is different for ARCompact/ARCv2 Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Assume multiplier is always presentVineet Gupta2016-02-181-2/+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>
* ARCv2: Check for LL-SC livelock only if LLSC is enabledVineet Gupta2016-01-291-0/+1
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: shrink cpuinfo by not saving full timer BCRVineet Gupta2016-01-291-7/+12
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: dw2 unwind: Reinstante unwinding out of modulesVineet Gupta2015-12-171-1/+0
| | | | | | | | | | | | | | | | | The fix which removed linear searching of dwarf (because binary lookup data always exists) missed out on the fact that modules don't get the binary lookup tables info. This caused unwinding out of modules to stop working. So add binary lookup header setup (equivalent of eh_frame_hdr setup) to modules as well. While at it, confine the header setup to within unwinder code, reducing one API exposed out of unwinder code. Fixes: 2e22502c080f ARC: dw2 unwind: Remove falllback linear search thru FDE entries Cc: <stable@vger.kernel.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: smp: Introduce smp hook @init_early_smp for Master coreVineet Gupta2015-10-281-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds a platform agnostic early SMP init hook which is called on Master core before calling setup_processor() setup_arch() smp_init_cpus() smp_ops.init_early_smp() ... setup_processor() How this helps: - Used for one time init of certain SMP centric IP blocks, before calling setup_processor() which probes various bits of core, possibly including this block - Currently platforms need to call this IP block init from their init routines, which doesn't make sense as this is specific to ARC core and not platform and otherwise requires copy/paste in all (and hence a possible point of failure) e.g. MCIP init is called from 2 platforms currently (axs10x and sim) which will go away once we have this. This change only adds the hooks but they are empty for now. Next commit will populate them and remove the explicit init calls from platforms. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: boot log: move helper macros to header for reuseVineet Gupta2015-10-171-4/+0
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with ↵Vineet Gupta2015-08-041-0/+4
| | | | | | | | | | | | | | | | | | | | exponential backoff This is to workaround the llock/scond livelock HS38x4 could get into a LLOCK/SCOND livelock in case of multiple overlapping coherency transactions in the SCU. The exclusive line state keeps rotating among contenting cores leading to a never ending cycle. So break the cycle by deferring the retry of failed exclusive access (SCOND). The actual delay needed is function of number of contending cores as well as the unrelated coherency traffic from other cores. To keep the code simple, start off with small delay of 1 which would suffice most cases and in case of contention double the delay. Eventually the delay is sufficient such that the coherency pipeline is drained, thus a subsequent exclusive access would succeed. Link: http://lkml.kernel.org/r/1438612568-28265-1-git-send-email-vgupta@synopsys.com Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: Fix the peripheral address space detectionVineet Gupta2015-08-031-1/+7
| | | | | | | | With HS 2.1 release, the peripheral space register no longer contains the uncached space specifics, causing the kernel to panic early on. So read the newer NON VOLATILE AUX register to get that info. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: support HS38 releasesVineet Gupta2015-07-131-1/+5
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: slightly refactor macros for boot loggingVineet Gupta2015-07-091-4/+5
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: clocksource: Introduce 64bit local RTC counterVineet Gupta2015-06-221-2/+7
| | | | | | Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: STAR 9000793984: Handle return from intr to Delay SlotVineet Gupta2015-06-221-0/+2
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARCv2: Support for ARCv2 ISA and HS38x coresVineet Gupta2015-06-221-5/+40
| | | | | | | | | | | | | | | | | | 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: uncached base is hard constant for ARC, don't save itVineet Gupta2015-06-221-2/+2
| | | | | | | ioremap already uses the hard define, just make sure BCR value matches that Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: explicit'ify uboot supportVineet Gupta2015-06-191-1/+4
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: RIP broken 64bit RTSCVineet Gupta2015-06-191-6/+2
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Fix RTT boot printingVineet Gupta2015-04-131-1/+4
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: fix /proc/cpuinfo for offline cpusVineet Gupta2015-02-021-1/+6
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: boot: cpu feature print enhancementsVineet Gupta2014-10-131-97/+110
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: boot: consolidate cross-checking of h/w and s/wVineet Gupta2014-10-131-29/+15
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: RIP @running_on_hwVineet Gupta2014-10-131-2/+0
| | | | | | | | | | * No active users of this flag anymore * flag itself was no longer usable with new simualtor which acts just like hardware, not providing the special chip-id = 0xffff which good old ISS used to do. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [plat*] move code out of .init_machine into commonVineet Gupta2014-10-131-1/+9
| | | | | | | 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>
* ARC: Allow SMP kernel to build/boot on UP-only infrastructureVineet Gupta2014-09-271-12/+1
| | | | | | | | | | | | | In light of recent SNAFU with SMP build, allow simple platform to build as SMP but run UP. * Remove the dependence on simulation SMP extension to enable quick build/test iterations of SMP kernel. * In absence of platform SMP registration, prevent the NULL smp feature name from borkign the system Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [cmdline] support External Device Trees from u-bootVineet Gupta2014-01-161-3/+12
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [cmdline] uboot cmdline handling reworkVineet Gupta2014-01-161-12/+27
| | | | | | | | | | * 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>
* Merge tag 'devicetree-for-3.13' of ↵Linus Torvalds2013-11-121-4/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull devicetree updates from Rob Herring: "DeviceTree updates for 3.13. This is a bit larger pull request than usual for this cycle with lots of clean-up. - Cross arch clean-up and consolidation of early DT scanning code. - Clean-up and removal of arch prom.h headers. Makes arch specific prom.h optional on all but Sparc. - Addition of interrupts-extended property for devices connected to multiple interrupt controllers. - Refactoring of DT interrupt parsing code in preparation for deferred probe of interrupts. - ARM cpu and cpu topology bindings documentation. - Various DT vendor binding documentation updates" * tag 'devicetree-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (82 commits) powerpc: add missing explicit OF includes for ppc dt/irq: add empty of_irq_count for !OF_IRQ dt: disable self-tests for !OF_IRQ of: irq: Fix interrupt-map entry matching MIPS: Netlogic: replace early_init_devtree() call of: Add Panasonic Corporation vendor prefix of: Add Chunghwa Picture Tubes Ltd. vendor prefix of: Add AU Optronics Corporation vendor prefix of/irq: Fix potential buffer overflow of/irq: Fix bug in interrupt parsing refactor. of: set dma_mask to point to coherent_dma_mask of: add vendor prefix for PHYTEC Messtechnik GmbH DT: sort vendor-prefixes.txt of: Add vendor prefix for Cadence of: Add empty for_each_available_child_of_node() macro definition arm/versatile: Fix versatile irq specifications. of/irq: create interrupts-extended property microblaze/pci: Drop PowerPC-ism from irq parsing of/irq: Create of_irq_parse_and_map_pci() to consolidate arch code. of/irq: Use irq_of_parse_and_map() ...
| * arc: remove unnecessary prom.h includesRob Herring2013-10-091-1/+0
| | | | | | | | | | | | | | | | Remove unnecessary prom.h includes in preparation to remove prom.h. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Grant Likely <grant.likely@linaro.org>
| * arc: use common of_flat_dt_match_machineRob Herring2013-10-091-1/+1
| | | | | | | | | | | | | | Convert arc to use the common of_flat_dt_match_machine function. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Vineet Gupta <vgupta@synopsys.com>
| * arc: use unflatten_and_copy_device_treeRob Herring2013-10-091-2/+1
| | | | | | | | | | | | | | | | | | Use the common unflatten_and_copy_device_tree to copy the built-in FDT out of init section. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Grant Likely <grant.likely@linaro.org>
* | ARC: Annotate some functions as staticVineet Gupta2013-11-061-6/+5
|/ | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: SMP failed to boot due to missing IVT setupNoam Camus2013-09-121-3/+0
| | | | | | | | | | | | | | | | | | | | | Commit 05b016ecf5e7a "ARC: Setup Vector Table Base in early boot" moved the Interrupt vector Table setup out of arc_init_IRQ() which is called for all CPUs, to entry point of boot cpu only, breaking booting of others. Fix by adding the same to entry point of non-boot CPUs too. read_arc_build_cfg_regs() printing IVT Base Register didn't help the casue since it prints a synthetic value if zero which is totally bogus, so fix that to print the exact Register. [vgupta: Remove the now stale comment from header of arc_init_IRQ and also added the commentary for halt-on-reset] Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: Cc: <stable@vger.kernel.org> #3.11 Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ARC: remove console_verbose() from setup_arch()Mischa Jonker2013-09-051-2/+0
| | | | | | | It prevents kernel parameters such as 'loglevel' from doing their job. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* arc: delete __cpuinit usage from all arc filesPaul Gortmaker2013-06-271-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. Note that some harmless section mismatch warnings may result, since notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c) are flagged as __cpuinit -- so if we remove the __cpuinit from arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit content into no-ops as early as possible, since that will get rid of these warnings. In any case, they are temporary and harmless. This removes all the arch/arc uses of the __cpuinit macros from all C files. Currently arc does not have any __CPUINIT used in assembly files. [1] https://lkml.org/lkml/2013/5/20/589 Cc: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Use kconfig helper IS_ENABLED() to get rid of defines.hVineet Gupta2013-06-221-4/+4
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [cmdline] Don't overwrite u-boot provided bootargsVineet Gupta2013-05-071-8/+10
| | | | | | | | | | | | The existing code was wrong on several counts: * uboot provided bootargs were copied into @boot_command_line, only to be over-written by setup_machine_fdt(), effectively lost * @cmdline_p returned by setup_arch() to start_kernel() didn't include the DT /bootargs Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [cmdline] Remove CONFIG_CMDLINEVineet Gupta2013-05-071-5/+0
| | | | | | | Given that DeviceTree /bootargs can provide similar functionality, no point in providing duplicate infrastructure. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: [build] Fix warnings with CONFIG_DEBUG_SECTION_MISMATCHVineet Gupta2013-04-091-5/+5
| | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* ARC: Remove duplicate inclusion of header filesSachin Kamat2013-04-091-1/+0
| | | | | | | Some header files were included twice in the same file. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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