Sending IPI_CPU_STOP to a CPU causes it to execute a busy cpu_relax
loop forever. This makes it impossible to kexec successfully on an SMP
system since the secondary CPUs do not reset.

This patch adds a callback to platform_cpu_kill, defined when
CONFIG_HOTPLUG_CPU=y, from the ipi_cpu_stop handling code. This function
currently just returns 1 on all platforms that define it but allows them
to do something more sophisticated in the future.
Signed-off-by: NWill Deacon <will.deacon@arm.com>

This patch adds the ARM_LPAE and ARCH_PHYS_ADDR_T_64BIT Kconfig entries
allowing LPAE support to be compiled into the kernel.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

The Kconfig options for the PL310 errata workarounds do not use a
consistent naming scheme for either the config option or the bool
description.

This patch tidies up the options by ensuring that the bool descriptions
are prefixed with "PL310 errata:" and the config options are prefixed
with PL310_ERRATA_, making it much clearer in menuconfig as to what the
workarounds are for.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This patch implements a workaround for PL310 erratum 769419. On
revisions of the PL310 prior to r3p2, the Store Buffer does not
automatically drain. This can cause normal, non-cacheable writes to be
retained when the memory system is idle, leading to suboptimal I/O
performance for drivers using coherent DMA.

This patch adds an optional wmb() call to the cpu_idle loop. On systems
with an outer cache, this causes an explicit flush of the store buffer.

Cc: stable@vger.kernel.org
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Tested-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Now that all platforms are converted to MULTI_IRQ_HANDLER, remove the
legacy support.
Tested-by: NThomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for picoxcell to help building multi platform kernels.
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for samsung to help building multi platform kernels.

Cc: Kukjin Kim <kgene.kim@samsung.com>
Tested-by: NThomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for versatile to help building multi platform kernels.

Cc: Russell King <linux@arm.linux.org.uk>
Tested-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for u300 to help building multi platform kernels.
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for spear to help building multi platform kernels.
Acked-by: NViresh Kumar <viresh.kumar@st.com>
Cc: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for s3c64xx to help building multi platform kernels.

Cc: Ben Dooks <ben-linux@fluff.org>
Tested-by: NThomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for nomadik to help building multi platform kernels.

Cc: Alessandro Rubini <rubini@unipv.it>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Cc: STEricsson <STEricsson_nomadik_linux@list.st.com>
Tested-by: NThomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for netx to help building multi platform kernels.
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that there is a generic IRQ handler for multiple VIC devices use it
for ep93xx to help building multi platform kernels.

Cc: Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>

Now that MULTI_IRQ_HANDLER is selected by all the in-tree
GIC users, make it mandatory and remove the unused macros.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

Convert the zynq platform to be using the gic_handle_irq
function as its primary interrupt handler.
Acked-by: NJohn Linn <john.linn@xilinx.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

Convert the cns3xxx platform to be using the gic_handle_irq
function as its primary interrupt handler.
Acked-by: NAnton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

Convert the Exynos4 platforms to be using the gic_handle_irq
function as their primary interrupt handler.

Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

Convert the VExpress platform to be using the gic_handle_irq
function as its primary interrupt handler.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

Convert the RealView platforms to be using the gic_handle_irq
function as their primary interrupt handler.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

Convert the highbank platform to be using the gic_handle_irq
function as its primary interrupt handler.

Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

The arch/arm/mach-exynos4 directory (CONFIG_ARCH_EXYNOS4) has
made for plaforms based on EXYNOS4 SoCs. But since upcoming
Samsung's SoCs such as EXYNOS5 (ARM Cortex A15) can reuse most
codes in current mach-exynos4, one mach-exynos directory will
be used for them.

This patch changes to CONFIG_ARCH_EXYNOS (arch/arm/mach-exynos)
but keeps original CONFIG_ARCH_EXYNOS4 in mach-exynos/Kconfig to
avoid changing in driver side.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

It adds the core definitions and low-level debug uart support
for imx6q.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

This enables SMP support on highbank processor.
Signed-off-by: NRob Herring <rob.herring@calxeda.com>
Reviewed-by: NJamie Iles <jamie@jamieiles.com>
Reviewed-by: NShawn Guo <shawn.guo@linaro.org>

This adds basic support for the Calxeda Highbank platform.
Signed-off-by: NRob Herring <rob.herring@calxeda.com>
Reviewed-by: NJamie Iles <jamie@jamieiles.com>
Reviewed-by: NShawn Guo <shawn.guo@linaro.org>

On mmp platform, there have two sram banks:
audio sram and internal sram. The audio sram is mainly for audio;
the internal sram is for video, wtm and power management.
So add the sram allocator using genalloc to manage them.

Every sram bank will register its own platform device
info, after the sram allocator create the generic pool
for the sram bank, the user module can use the pool's
name to get the pool handler; then it can use the handler
to alloc/free memory with genalloc APIs.
Signed-off-by: NLeo Yan <leoy@marvell.com>
Acked-by: NHaojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: NEric Miao <eric.y.miao@gmail.com>

ARM uses its own BUG() handler which makes its output slightly different
from other archtectures.

One of the problems is that the ARM implementation doesn't report the function
with the BUG() in it, but always reports the PC being in __bug(). The generic
implementation doesn't have this problem.

Currently we get something like:

kernel BUG at fs/proc/breakme.c:35!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
...
PC is at __bug+0x20/0x2c

With this patch it displays:

kernel BUG at fs/proc/breakme.c:35!
Internal error: Oops - undefined instruction: 0 [#1] PREEMPT SMP
...
PC is at write_breakme+0xd0/0x1b4

This implementation uses an undefined instruction to implement BUG, and sets up
a bug table containing the relevant information. Many versions of gcc do not
support %c properly for ARM (inserting a # when they shouldn't) so we work
around this using distasteful macro magic.

v1: Initial version to replace existing ARM BUG() implementation with something
more similar to other architectures.

v2: Add Thumb support, remove backtrace whitespace output changes. Change to
use macros instead of requiring the asm %d flag to work (thanks to
Dave Martin <dave.martin@linaro.org>)

v3: Remove old BUG() implementation in favor of this one.
Remove the Backtrace: message (will submit this separately).
Use ARM_EXIT_KEEP() so that some architectures can dump exit text at link time
thanks to Stephen Boyd <sboyd@codeaurora.org> (although since we always
define GENERIC_BUG this might be academic.)
Rebase to linux-2.6.git master.

v4: Allow BUGS in modules (these were not reported correctly in v3)
(thanks to Stephen Boyd <sboyd@codeaurora.org> for suggesting that.)
Remove __bug() as this is no longer needed.

v5: Add %progbits as the section flags.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NStephen Boyd <sboyd@codeaurora.org>
Tested-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

The affinity between ARM processors is defined in the MPIDR register.
We can identify which processors are in the same cluster,
and which ones have performance interdependency. We can define the
cpu topology of ARM platform, that is then used by sched_mc and sched_smt.

The default state of sched_mc and sched_smt config is disable.
When enabled, the behavior of the scheduler can be modified with
sched_mc_power_savings and sched_smt_power_savings sysfs interfaces.

Changes since v4 :
*  Remove unnecessary parentheses and blank lines

Changes since v3 :
* Update the format of printk message
* Remove blank line

Changes since v2 :
* Update the commit message and some comments

Changes since v1 :
* Update the commit message
* Add read_cpuid_mpidr in arch/arm/include/asm/cputype.h
* Modify header of arch/arm/kernel/topology.c
* Modify tests and manipulation of MPIDR's bitfields
* Modify the place and dependancy of the config
* Modify Noop functions
Signed-off-by: NVincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: NAmit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Given that we want the default to not have any <mach/memory.h> and given
that there are now fewer cases where it is still provided than the cases
where it is not at this point, this makes sense to invert the logic and
just identify the exception cases.

The word "need" instead of "have" was chosen to construct the config
symbol so not to suggest that having a mach/memory.h file is actually
a feature that one should aim for.
Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Move some DDR2 related defines into a private <mach/ddr2.h> beforehand.
Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>