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2015-12-01ARM: use const and __initconst for smp_operationsMasahiro Yamada
These smp_operations structures are not over-written, so add "const" qualifier and replace __initdata with __initconst. Also, add "static" where it is possible. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Moritz Fischer <moritz.fischer@ettus.com> Acked-by: Stephen Boyd <sboyd@codeaurora.org> # qcom part Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Wei Xu <xuwei5@hisilicon.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Acked-by: Shawn Guo <shawnguo@kernel.org> Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2015-06-26Merge tag 'armsoc-soc' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC platform support updates from Kevin Hilman: "Our SoC branch usually contains expanded support for new SoCs and other core platform code. Some highlights from this round: - sunxi: SMP support for A23 SoC - socpga: big-endian support - pxa: conversion to common clock framework - bcm: SMP support for BCM63138 - imx: support new I.MX7D SoC - zte: basic support for ZX296702 SoC" * tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (134 commits) ARM: zx: Add basic defconfig support for ZX296702 ARM: dts: zx: add an initial zx296702 dts and doc clk: zx: add clock support to zx296702 dt-bindings: Add #defines for ZTE ZX296702 clocks ARM: socfpga: fix build error due to secondary_startup MAINTAINERS: ARM64: EXYNOS: Extend entry for ARM64 DTS ARM: ep93xx: simone: support for SPI-based MMC/SD cards MAINTAINERS: update Shawn's email to use kernel.org one ARM: socfpga: support suspend to ram ARM: socfpga: add CPU_METHOD_OF_DECLARE for Arria 10 ARM: socfpga: use CPU_METHOD_OF_DECLARE for socfpga_cyclone5 ARM: EXYNOS: register power domain driver from core_initcall ARM: EXYNOS: use PS_HOLD based poweroff for all supported SoCs ARM: SAMSUNG: Constify platform_device_id ARM: EXYNOS: Constify irq_domain_ops ARM: EXYNOS: add coupled cpuidle support for Exynos3250 ARM: EXYNOS: add exynos_get_boot_addr() helper ARM: EXYNOS: add exynos_set_boot_addr() helper ARM: EXYNOS: make exynos_core_restart() less verbose ARM: EXYNOS: fix exynos_boot_secondary() return value on timeout ...
2015-06-01ARM: v7 setup function should invalidate L1 cacheRussell King
All ARMv5 and older CPUs invalidate their caches in the early assembly setup function, prior to enabling the MMU. This is because the L1 cache should not contain any data relevant to the execution of the kernel at this point; all data should have been flushed out to memory. This requirement should also be true for ARMv6 and ARMv7 CPUs - indeed, these typically do not search their caches when caching is disabled (as it needs to be when the MMU is disabled) so this change should be safe. ARMv7 allows there to be CPUs which search their caches while caching is disabled, and it's permitted that the cache is uninitialised at boot; for these, the architecture reference manual requires that an implementation specific code sequence is used immediately after reset to ensure that the cache is placed into a sane state. Such functionality is definitely outside the remit of the Linux kernel, and must be done by the SoC's firmware before _any_ CPU gets to the Linux kernel. Changing the data cache clean+invalidate to a mere invalidate allows us to get rid of a lot of platform specific hacks around this issue for their secondary CPU bringup paths - some of which were buggy. Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Tested-by: Florian Fainelli <f.fainelli@gmail.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Acked-by: Shawn Guo <shawn.guo@linaro.org> Tested-by: Thierry Reding <treding@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Michal Simek <michal.simek@xilinx.com> Tested-by: Wei Xu <xuwei5@hisilicon.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-05-18ARM: zynq: Use restart_handler mechanism for slcr resetJosh Cartwright
By making use of the restart_handler chain mechanism, the SLCR-based reset mechanism can be prioritized amongst other mechanisms available on a particular board. Choose a default high-ish priority of 192 for this restart mechanism. Signed-off-by: Josh Cartwright <joshc@ni.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-12-01ARM: zynq: Remove secondary_startup() declaration from headerMichal Simek
secondary_startup() in the header is not needed at all. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-09-16ARM: zynq: Remove hotplug.cSoren Brinkmann
The hotplug code contains only a single function, which is an SMP function. Move that to platsmp.c where all other SMP runctions reside. That allows removing hotplug.c and declaring the cpu_die function static. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-09-16ARM: zynq: Synchronise zynq_cpu_die/killSoren Brinkmann
Avoid races and add synchronisation between the arch specific kill and die routines. The same synchronisation issue was fixed on IMX platform by this commit: "ARM: imx: fix sync issue between imx_cpu_die and imx_cpu_kill" (sha1: 2f3edfd7e27ad4206acbc2ae99c9df5f46353024) Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-09-16ARM: zynq: PM: Enable DDR clock stopSoren Brinkmann
The DDR controller can detect idle periods and leverage low power features clock stop. When new requests occur, the DDRC resumes normal operation. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-09-16ARM: zynq: PM: Enable A9 internal clock gating featureSoren Brinkmann
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-05-20ARM: zynq: Add support for SOC_BUSMichal Simek
Provide information through SOC_BUS to user space. Silicon revision is provided through devcfg device. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-02-10ARM: zynq: Make zynq_slcr_base staticSteffen Trumtrar
The pointer doesn't need to be passed around any more. Make it static. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2014-02-10ARM: zynq: Split slcr in two partsMichal Simek
Split the slcr into an early part for unlocking and cpu starting and a later syscon driver. Also add "syscon" compatible property for slcr. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2013-12-10arm: zynq: Invalidate L1 in secondary bootSoren Brinkmann
During boot, Linux initiates a clean-invalidate operation only, resulting in faulty data to be written to the memory system during resume. Therefore invalidate the L1 in the secondary boot path to avoid these issues. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2013-07-14arm: delete __cpuinit/__CPUINIT usage from all ARM usersPaul Gortmaker
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) and are flagged as __cpuinit -- so if we remove the __cpuinit from the arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit related 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 ARM uses of the __cpuinit macros from C code, and all __CPUINIT from assembly code. It also had two ".previous" section statements that were paired off against __CPUINIT (aka .section ".cpuinit.text") that also get removed here. [1] https://lkml.org/lkml/2013/5/20/589 Cc: Russell King <linux@arm.linux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-04-04arm: zynq: Add hotplug supportMichal Simek
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2013-04-04arm: zynq: Add smp supportMichal Simek
Zynq is dual core Cortex A9 which starts always at zero. Using simple trampoline ensure long jump to secondary_startup code. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
2013-04-04arm: zynq: Add support for system resetMichal Simek
Do system reset via slcr registers. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2013-04-04arm: zynq: Move slcr initialization to separate fileMichal Simek
Create separate slcr driver instead of polluting common code. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2013-04-04arm: zynq: Load scu baseaddress at run timeMichal Simek
Use Cortex a9 cp15 to read scu baseaddress. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2013-04-04arm: zynq: Move timer to clocksource interfaceMichal Simek
Use clocksource timer initialization. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2013-01-28arm: zynq: timer: Replace PSS through PSSoren Brinkmann
The acronym PSS is deprecated by Xilinx. The correct term, which is also used in Xilinx documentation is PS (processing system). This is just a search and replace: - s/PSS/PS/g - s/pss/ps/g Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Tested-by: Josh Cartwright <josh.cartwright@ni.com>
2012-11-05ARM: zynq: move arm-specific sys_timer out of ttcJosh Cartwright
Move the sys_timer definition out of ttc driver and make it part of the common zynq code. This is preparation for renaming and COMMON_CLK support. Signed-off-by: Josh Cartwright <josh.cartwright@ni.com> Tested-by: Michal Simek <michal.simek@xilinx.com>
2011-07-07ARM: Xilinx: merge board file into main platform codeArnd Bergmann
The zynq platform will never have board files other than the device tree one, so there is no point splitting it from common.c. This makes the code more compact. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: John Linn <john.linn@xilinx.com>
2011-06-20ARM: Xilinx: Adding Xilinx board supportJohn Linn
The 1st board support is minimal to get a system up and running on the Xilinx platform. This platform reuses the clock implementation from plat-versatile, and it depends entirely on CONFIG_OF support. There is only one board support file which obtains all device information from a device tree dtb file which is passed to the kernel at boot time. Signed-off-by: John Linn <john.linn@xilinx.com>
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