treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 1)

Based on the normalized pattern:

this file is licensed under the terms of the gnu general public
license version 2 this program is licensed as is without any warranty
of any kind whether express or implied

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference.

Reviewed-by: Allison Randal <allison@lohutok.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

ARM: use const and __initconst for smp_operations

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>

arm/mach-mvebu: remove legacy __cpuinit sections that crept in

We removed __cpuinit support (leaving no-op stubs) quite some time
ago. However these ones crept back in as of commit 1ee89e2231a1b04dc3476
("ARM: mvebu: add SMP support for Armada 375 and Armada 38x")

Since we want to clobber the stubs soon, get this removed now.
Note that there would normally be a corresponding removal of
a ".previous" directive for each __CPUINIT in asm files, but in
this case it appears that this single function file was never
paired off with one.

Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

ARM: mvebu: add core support for Armada 39x

This commit adds the core support for Armada 39x, which is quite
simple:

- a new Kconfig option which selects the appropriate clock and
pinctrl drivers as well as other common features (GIC, L2 cache,
SMP, etc.)

- a new DT_MACHINE_START which references the top-level compatible
strings supported for the Marvell Armada 39x.

- a new SMP enable-method. The mechanism to enable CPUs for Armada
39x appears to be the same as Armada 38x. However, we do not want
to use marvell,armada-380-smp in the Device Tree, in the case of
the discovery of a subtle difference in the future, which would
require changing the Device Tree. And the enable-method isn't a
compatible string: you can't specify several values and expect a
fallback on the second string if the first one isn't
supported. Therefore, we simply declare the SMP enable method
"marvell,armada-390-smp" as doing the same thing as the
"marvell,armada-380-smp" one.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

ARM: mvebu: Implement the CPU hotplug support for the Armada 38x SoCs

This commit implements the CPU hotplug support for the Marvell Armada
38x platform. Similarly to what was done for the Armada XP, this
commit:

* Implements the ->cpu_die() function of SMP operations by calling
armada_38x_do_cpu_suspend() to enter the deep idle state for
CPUs going offline.

* Implements a dummy ->cpu_kill() function, simply needed for the
kernel to know we have CPU hotplug support.

* The mvebu_cortex_a9_boot_secondary() function makes sure to wake up
the CPU if waiting in deep idle state by sending an IPI before
deasserting the CPUs from reset. This is because
mvebu_cortex_a9_boot_secondary() is now used in two different
situations: for the initial boot of secondary CPUs (where CPU reset
deassert is used to wake up CPUs) and for CPU hotplug (where an IPI
is used to take CPU out of deep idle).

* At boot time, we exit from the idle state in the
->smp_secondary_init() hook.

This commit has been tested using CPU hotplug through sysfs
(/sys/devices/system/cpu/cpuX/online) and using kexec.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1414669184-16785-5-git-send-email-gregory.clement@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

ARM: mvebu: use the common function for Armada 375 SMP workaround

Use the common function mvebu_setup_boot_addr_wa() introduced in the
commit "ARM: mvebu: Add a common function for the boot address work
around" instead of the dedicated version for Armada 375.

This commit also moves the workaround in the system-controller
module. Indeed the workaround on 375 is really related to setting the
boot address which is done by the system controller.

As a bonus we no longer use an harcoded value to access the register
storing the boot address.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1406120453-29291-5-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

ARM: mvebu: Staticize armada_375_smp_cpu1_enable_wa

'armada_375_smp_cpu1_enable_wa' is local to this file.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Link: https://lkml.kernel.org/r/1403610235-22654-2-git-send-email-sachin.kamat@samsung.com
Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

ARM: mvebu: remove stub implementation of CPU hotplug on Armada 375/38x

In preparation to the addition of CPU hotplug support for Armada XP,
and therefore moving the existing stub functions for hotplug support,
this commit removes the reference from the SMP implementation of
Armada 375/38x to the armada_xp_cpu_die() function. Proper CPU hotplug
support for Armada 375 and 38x will be implemented at a later point.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1401481098-23326-2-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

ARM: mvebu: conditionalize Armada 375 SMP workaround

The Armada 375 SMP workaround only needs to be applied to the Z1
revision of the SoC. The A0 and later revisions have been fixed, and
no longer need this workaround.

Note that the initialization of the SMP workaround is delayed from
->smp_prepare_cpus() to ->smp_boot_secondary() because when
->smp_prepare_cpus() is called, the early initcalls have not be
called, so the mvebu-soc-id mechanism is not operational. Since the
workaround is anyway not needed before the secondary CPU is started,
we can delay its implementation until the ->smp_boot_secondary() call.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1399302326-6917-5-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

ARM: mvebu: add workaround for SMP support for Armada 375 stepping Z1

Due to internal bootrom issue, CPU[1] initial jump code (four
instructions) should be placed in SRAM memory of the SoC. In order to
achieve this, we have to unmap the BootROM and at some specific
location where the BootROM was place, create a specific MBus window
for the SRAM. This SRAM is initialized with a few instructions of code
that allows to jump into the real secondary CPU boot address.

This workaround will most likely be disabled when newer steppings of
the Armada 375 will be made available, in which case a dynamic test
based on mvebu-soc-id will be added.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483648-26611-10-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483648-26611-10-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

ARM: mvebu: add SMP support for Armada 375 and Armada 38x

This commit adds the SMP support for Armada 375 and Armada 38x. It
turns out that the SMP logic for both of these SOCs are fairly
similar, the only differences being:

* A different method to set the secondary CPU boot address

* An Armada 375 specific workaround needed for the early Z1 stepping,
added by the following patch.

Other than that, the patch is fairly straightforward and adds the
usual platsmp and headsmp code, defining the smp_operations structure
that is referenced from the DT_MACHINE structures.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483648-26611-9-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483648-26611-9-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>