As the init functions necessary for machine init have moved to
generic.h, remove the unnecessary includes and prototypes definitions
from pxa-dt.c.

This removes the include of mach/pxaXXX-regs.h, and make pxa-dt generic
enough to accept other pxa variants.
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Acked-by: NArnd Bergmann <arnd@arndb.de>

In order to have a unique .c file for all pxa variants device-tree
definitions, all the initialization functions for MACHINE_START and
DT_MACHINE_START have been put together into generic.h.

The alternative would have been one pxaXXX-dt.c file per variant.

The move is necessary because each include/mach/pxaXXX.h includes the
variant register descriptions which intersects and conflicts one with
each other.

The change is a preparation for pxa-dt.c to support multiple pxa,
ie. pxa3xx and pxa27x.

The machine files including mach/pxaXXX.h all include generic.h, which
guarantees no regression should be introduced.
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Acked-by: NArnd Bergmann <arnd@arndb.de>

Add the initializer for irqs in a device-tree machine on a pxa27x.
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Acked-by: NArnd Bergmann <arnd@arndb.de>

Switch to simpler gpio-charger module. PDA power requires additional
setup in platform file and is more suited for boards with separate AC
and USB charging inputs. Tosa has a unified input, so it's better suited
for gpio-charger.
Signed-off-by: NDmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>

Use the more common pr_warn.

Other miscellanea:

o Coalesce formats
o Realign arguments
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>

Explicitly set the dr_mode for the second dwc3 controller on the
Arndale Octa board to host mode. This is required to ensure the
controller is initialized in the right mode if the kernel is build
with USB gadget support.
Reported-By: NAndreas Faerber <afaerber@suse.de>
Signed-off-by: NSjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

In case the optional dr_mode property isn't set in the dwc3 nodes the
the controller will go into OTG mode if both USB host and USB gadget
functionality are enabled in the kernel configuration. Unfortunately
this results in USB not working on exynos5420-peach-pit and
exynos5800-peach-pi with such a kernel configuration unless manually
change the mode. To resolve that explicitly configure the dual role
mode as host.
Signed-off-by: NSjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: NAndreas Faerber <afaerber@suse.de>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

The EIRSR and ELRSR registers are 32-bit registers on GICv2, and we
store these as an array of two such registers on the vgic vcpu struct.
However, we access them as a single 64-bit value or as a bitmap pointer
in the generic vgic code, which breaks BE support.

Instead, store them as u64 values on the vgic structure and do the
word-swapping in the assembly code, which already handles the byte order
for BE systems.
Tested-by: NVictor Kamensky <victor.kamensky@linaro.org>
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

CM-QS600 is a APQ8064 based computer on module.
The details are available at
http://compulab.co.il/products/computer-on-modules/cm-qs600/Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Acked-by: NIgor Grinberg <grinberg@compulab.co.il>
Signed-off-by: NKumar Gala <galak@codeaurora.org>

This DTS has support for the Sony Xperia Z1 phone (codenamed Honami).
This first version of the DTS supports just a serial console.
Signed-off-by: NTim Bird <tim.bird@sonymobile.com>
Tested-by: NKevin Hilman <khilman@linaro.org>
Signed-off-by: NKumar Gala <galak@codeaurora.org>

Add SATA PHY and SATA AHCI controller nodes to device tree to enable
generic ahci support on the IPQ8064/AP148 board.
Signed-off-by: NKumar Gala <galak@codeaurora.org>

Commit:
b8865767 ARM: KVM: user_mem_abort: support stage 2 MMIO page mapping

introduced some code in user_mem_abort that failed to compile if
STRICT_MM_TYPECHECKS was enabled.

This patch fixes up the failing comparison.
Signed-off-by: NSteve Capper <steve.capper@linaro.org>
Reviewed-by: NKim Phillips <kim.phillips@linaro.org>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

Commit 97a13e52 ('net: phy: mdio-sun4i: don't select REGULATOR') removed
the select of REGULATOR, which means that it now has to be explicitly
enabled in the defconfig or things won't work very well.

In particular, this fixes a problem with SD/MMC not probing on my A31-based
board.

Cc: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>

When creating or moving a memslot, make sure the IPA space is within the
addressable range of the guest.  Otherwise, user space can create too
large a memslot and KVM would try to access potentially unallocated page
table entries when inserting entries in the Stage-2 page tables.
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

This patch adds the necessary support for all host kernel PGSIZE and
VA_SPACE configuration options for both EL2 and the Stage-2 page tables.

However, for 40bit and 42bit PARange systems, the architecture mandates
that VTCR_EL2.SL0 is maximum 1, resulting in fewer levels of stage-2
pagge tables than levels of host kernel page tables.  At the same time,
systems with a PARange > 42bit, we limit the IPA range by always setting
VTCR_EL2.T0SZ to 24.

To solve the situation with different levels of page tables for Stage-2
translation than the host kernel page tables, we allocate a dummy PGD
with pointers to our actual inital level Stage-2 page table, in order
for us to reuse the kernel pgtable manipulation primitives.  Reproducing
all these in KVM does not look pretty and unnecessarily complicates the
32-bit side.

Systems with a PARange < 40bits are not yet supported.

 [ I have reworked this patch from its original form submitted by
   Jungseok to take the architecture constraints into consideration.
   There were too many changes from the original patch for me to
   preserve the authorship.  Thanks to Catalin Marinas for his help in
   figuring out a good solution to this challenge.  I have also fixed
   various bugs and missing error code handling from the original
   patch. - Christoffer ]
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJungseok Lee <jungseoklee85@gmail.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

The kernel used to contain two functions for length-delimited,
case-insensitive string comparison, strnicmp with correct semantics and
a slightly buggy strncasecmp.  The latter is the POSIX name, so strnicmp
was renamed to strncasecmp, and strnicmp made into a wrapper for the new
strncasecmp to avoid breaking existing users.

To allow the compat wrapper strnicmp to be removed at some point in the
future, and to avoid the extra indirection cost, do
s/strnicmp/strncasecmp/g.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix wrong compatible string of Exynos3250 RTC (Real-Time Clock) dt node.
The RTC of Exynos3250 must need additional source clock (XrtcXTI).
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>
Acked-by: NKyungmin Park <kyungmin.park@samsung.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

There is really no point in faulting in memory regions page by page
if they are not backed by demand paged system RAM but by a linear
passthrough mapping of a host MMIO region. So instead, detect such
regions at setup time and install the mappings for the backing all
at once.
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Reviewed-by: NChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

Now that we support read-only memslots, we need to make sure that
pass-through device mappings are not mapped writable if the guest
has requested them to be read-only. The existing implementation
already honours this by calling kvm_set_s2pte_writable() on the new
pte in case of writable mappings, so all we need to do is define
the default pgprot_t value used for devices to be PTE_S2_RDONLY.
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

Add support for read-only MMIO passthrough mappings by adding a
'writable' parameter to kvm_phys_addr_ioremap. For the moment,
mappings will be read-write even if 'writable' is false, but once
the definition of PAGE_S2_DEVICE gets changed, those mappings will
be created read-only.
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

Handle the potential NULL return value of find_vma_intersection()
before dereferencing it.
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

Pass __GFP_ZERO to __get_free_pages() instead of calling memset()
explicitly.
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

The different architectures used their own (and different) declarations:

    extern __visible const void __nosave_begin, __nosave_end;
    extern const void __nosave_begin, __nosave_end;
    extern long __nosave_begin, __nosave_end;

Consolidate them using the first variant in <asm/sections.h>.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Activate the RCU fast_gup for ARM.  We also need to force THP splits to
broadcast an IPI s.t.  we block in the fast_gup page walker.  As THP
splits are comparatively rare, this should not lead to a noticeable
performance degradation.

Some pre-requisite functions pud_write and pud_page are also added.
Signed-off-by: NSteve Capper <steve.capper@linaro.org>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Cc: Dann Frazier <dann.frazier@canonical.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

In order to implement fast_get_user_pages we need to ensure that the page
table walker is protected from page table pages being freed from under it.

This patch enables HAVE_RCU_TABLE_FREE, any page table pages belonging to
address spaces with multiple users will be call_rcu_sched freed.  Meaning
that disabling interrupts will block the free and protect the fast gup
page walker.
Signed-off-by: NSteve Capper <steve.capper@linaro.org>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Cc: Dann Frazier <dann.frazier@canonical.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We need a mechanism to tag ptes as being special, this indicates that no
attempt should be made to access the underlying struct page * associated
with the pte.  This is used by the fast_gup when operating on ptes as it
has no means to access VMAs (that also contain this information)
locklessly.

The L_PTE_SPECIAL bit is already allocated for LPAE, this patch modifies
pte_special and pte_mkspecial to make use of it, and defines
__HAVE_ARCH_PTE_SPECIAL.

This patch also excludes special ptes from the icache/dcache sync logic.
Signed-off-by: NSteve Capper <steve.capper@linaro.org>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Cc: Dann Frazier <dann.frazier@canonical.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

DMA-mapping supports CMA regions places either in low or high memory, so
there is no longer needed to limit default CMA regions only to low memory.
 The real limit is still defined by architecture specific DMA limit.
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Reported-by: NRussell King - ARM Linux <linux@arm.linux.org.uk>
Acked-by: NMichal Nazarewicz <mina86@mina86.com>
Cc: Daniel Drake <drake@endlessm.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

ARM currently uses a bitmap for tracking atomic allocations.  genalloc
already handles this type of memory pool allocation so switch to using
that instead.
Signed-off-by: NLaura Abbott <lauraa@codeaurora.org>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Riley <davidriley@chromium.org>
Cc: Olof Johansson <olof@lixom.net>
Cc: Ritesh Harjain <ritesh.harjani@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

For architectures without coherent DMA, memory for DMA may need to be
remapped with coherent attributes.  Factor out the the remapping code from
arm and put it in a common location to reduce code duplication.

As part of this, the arm APIs are now migrated away from
ioremap_page_range to the common APIs which use map_vm_area for remapping.
 This should be an equivalent change and using map_vm_area is more correct
as ioremap_page_range is intended to bring in io addresses into the cpu
space and not regular kernel managed memory.
Signed-off-by: NLaura Abbott <lauraa@codeaurora.org>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Riley <davidriley@chromium.org>
Cc: Olof Johansson <olof@lixom.net>
Cc: Ritesh Harjain <ritesh.harjani@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Laura Abbott <lauraa@codeaurora.org>
Cc: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

I added smc91x support but turns out we currently do not set the
smc91x timings in gpmc.c but rely on the bootloader timings. This
produces the following error unless the smc91x GPMC timings are
initialized by the bootloader:

Unhandled fault: external abort on non-linefetch (0x1008) at 0xd080630e
...
[<c04067fc>] (smc_drv_probe) from [<c038e9c4>] (platform_drv_probe+0x2c/0x5c)
[<c038e9c4>] (platform_drv_probe) from [<c038d450>] (driver_probe_device+0x104/0x22c)
[<c038d450>] (driver_probe_device) from [<c038d60c>] (__driver_attach+0x94/0x98)
[<c038d60c>] (__driver_attach) from [<c038bc3c>] (bus_for_each_dev+0x54/0x88)
[<c038bc3c>] (bus_for_each_dev) from [<c038cc3c>] (bus_add_driver+0xd8/0x1d8)
[<c038cc3c>] (bus_add_driver) from [<c038dd74>] (driver_register+0x78/0xf4)
[<c038dd74>] (driver_register) from [<c0008924>] (do_one_initcall+0x80/0x1c0)
[<c0008924>] (do_one_initcall) from [<c0852d9c>] (kernel_init_freeable+0x1b8/0x28c)
[<c0852d9c>] (kernel_init_freeable) from [<c05ce86c>] (kernel_init+0x8/0xec)
[<c05ce86c>] (kernel_init) from [<c000e728>] (ret_from_fork+0x14/0x2c)

Let's fix the issue by disabling the smc91x module for now until we
have sorted out the issues in gpmc.c.
Reported-by: NKevin Hilman <khilman@linaro.org>
Tested-by: NKevin Hilman <khilman@linaro.org>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Somehow we don't have this set in omap2plus_defconfig. Without this
apps can segfault randomly on omap3. I can reproduce this easily
on am37xx-evm by doing apt-get update over NFSroot.
Tested-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Regulators for MMC2 (SD card) are PVDD_TFLASH_2V8 (LDO19) for vmmc
and PVDD_APIO_MMCOFF_2V8 (LDO13) for vqmmc.  Currently the device
tree entry for MMC2 uses PVDD_PRE_1V8 (LDO10) for vmmc and vqmmc is
not specified.  Fix it.

Without this patch:
- "mmc: dw_mmc: use mmc_regulator_get_supply to handle regulators"
  patch causes a SD card detection to fail
- "mmc: dw_mmc: Support voltage changes" patch causes a boot hang

This patch fixes both above problems.
Suggested-by: NDoug Anderson <dianders@google.com>
Cc: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: NKyungmin Park <kyungmin.park@samsung.com>
Fixes: 01730558 ("mmc: dw_mmc: Support voltage changes")
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This reverts commit 9ff25d7b.

Originally reported on the kernel-build-reports mailing list[0]. The
problem is caused by kernel configs that select both pxa25x and pxa27x
such as cm_x2xx_defconfig and palmz72_defconfig. The short term solution
is to revert the patch introducing the failure. Longer term, all the PXA
chips will be converted to the common clock framework allowing support
for various PXA chips to build into a single image.

Reverting just this one patch does introduce some dead code into the
kernel, but that is offset by making it easier to convert the remaining
PXA platforms to the clock framework.

[0] http://lists.linaro.org/pipermail/kernel-build-reports/2014-October/005576.htmlSigned-off-by: NMike Turquette <mturquette@linaro.org>

The naming convention of this driver was always under the scanner, people
complained that it should have a more generic name than cpu0, as it manages all
CPUs that are sharing clock lines.

Also, in future it will be modified to support any number of clusters with
separate clock/voltage lines.

Lets rename it to 'cpufreq_dt' from 'cpufreq_cpu0'.
Tested-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

The Xen ARM API is stable since Xen 4.4 and everything has been
upstreamed in Linux for ARM and ARM64. Therefore we can drop "EXPERIMENTAL"
from the Xen option in the both Kconfig.
Signed-off-by: NJulien Grall <julien.grall@linaro.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org

Use the much more reader friendly ACCESS_ONCE() instead of the cast to volatile.
This is purely a stylistic change.
Signed-off-by: NPranith Kumar <bobby.prani@gmail.com>
Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>
Acked-by: NHans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org
Link: http://lkml.kernel.org/r/1411482607-20948-1-git-send-email-bobby.prani@gmail.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

This patch extends the start and end address of initrd to be page aligned,
so that we can free all memory including the un-page aligned head or tail
page of initrd, if the start or end address of initrd are not page
aligned, the page can't be freed by free_initrd_mem() function.
Signed-off-by: NYalin Wang <yalin.wang@sonymobile.com>
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This patch changes the __init_end address to a
page align address, so that free_initmem() can
free the whole .init section, because if the end
address is not page aligned, it will round down to
a page align address, then the tail unligned page
will not be freed.
Signed-off-by: Nwang <yalin.wang2010@gmail.com>
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NCarlo Caione <carlo@caione.org>

When both 'cache-size' and 'cache-sets' are specified for a L2 cache
controller node, parse those properties and set up the
set size based on which type of L2 cache controller we are using.

Update the L2 cache controller Device Tree binding with the optional
'cache-size', 'cache-sets', 'cache-block-size' and 'cache-line-size'
properties. These come from the ePAPR specification.

Using the cache size, number of sets and cache line size we can
calculate desired associativity of the L2 cache. This is done
by the calculation:

    set size = cache size / sets
    ways = set size / line size
    way size = cache size / ways = sets * line size
    associativity = cache size / way size

Example output from the PB1176 DT that look like this:

L2: l2-cache {
    compatible = "arm,l220-cache";
    (...)
    arm,override-auxreg;
    cache-size = <131072>; // 128kB
    cache-sets = <512>;
    cache-line-size = <32>;
};

Ends up like this:

L2C OF: override cache size: 131072 bytes (128KB)
L2C OF: override line size: 32 bytes
L2C OF: override way size: 16384 bytes (16KB)
L2C OF: override associativity: 8
L2C: DT/platform modifies aux control register: 0x02020fff -> 0x02030fff
L2C-220 cache controller enabled, 8 ways, 128 kB
L2C-220: CACHE_ID 0x41000486, AUX_CTRL 0x06030fff

Which is consistent with the value earlier hardcoded for the
PB1176 platform.

This patch is an extended version based on the initial patch
by Florian Fainelli.
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>