Commit c22c8043 ("MIPS: Fix input modify in
__write_64bit_c0_split()") modified __write_64bit_c0_split() constraints
such that we have both an input & an output which we hope to assign to
the same registers, and modify the output rather than incorrectly
clobbering an input.

The way in which we use both an output & an input parameter with the
input constrained to share the output registers is a little convoluted &
also problematic for clang, which complains if the input & output values
have different widths. For example:

  In file included from kernel/fork.c:98:
  ./arch/mips/include/asm/mmu_context.h:149:19: error: unsupported
    inline asm: input with type 'unsigned long' matching output with
    type 'unsigned long long'
          write_c0_entryhi(cpu_asid(cpu, next));
          ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
  ./arch/mips/include/asm/mmu_context.h:93:2: note: expanded from macro
    'cpu_asid'
          (cpu_context((cpu), (mm)) & cpu_asid_mask(&cpu_data[cpu]))
          ^
  ./arch/mips/include/asm/mipsregs.h:1617:65: note: expanded from macro
    'write_c0_entryhi'
  #define write_c0_entryhi(val)   __write_ulong_c0_register($10, 0, val)
                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
  ./arch/mips/include/asm/mipsregs.h:1430:39: note: expanded from macro
    '__write_ulong_c0_register'
                  __write_64bit_c0_register(reg, sel, val);               \
                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
  ./arch/mips/include/asm/mipsregs.h:1400:41: note: expanded from macro
    '__write_64bit_c0_register'
                  __write_64bit_c0_split(register, sel, value);           \
                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
  ./arch/mips/include/asm/mipsregs.h:1498:13: note: expanded from macro
    '__write_64bit_c0_split'
                          : "r,0" (val));                                 \
                                   ^~~

We can both fix this build failure & simplify the code somewhat by
assigning the __tmp variable with the input value in C prior to our
inline assembly, and then using a single read-write output operand (ie.
a constraint beginning with +) to provide this value to our assembly.
Signed-off-by: NPaul Burton <paul.burton@mips.com>

Passing an array (swapper_pg_dir) as the argument to write_c0_kpgd() in
setup_pw() will become problematic if we modify __write_64bit_c0_split()
to cast its val argument to unsigned long long, because for 32-bit
kernel builds the size of a pointer will differ from the size of an
unsigned long long. This would fall foul of gcc's pointer-to-int-cast
diagnostic.

Cast the value to a long, which should be the same width as the pointer
that we ultimately want & will be sign extended if required to the
unsigned long long that __write_64bit_c0_split() ultimately needs.
Signed-off-by: NPaul Burton <paul.burton@mips.com>

The MIPS VDSO code filters out a subset of known-good flags from
KBUILD_CFLAGS to use when building VDSO libraries. When we build using
clang we need to allow the --target flag through, otherwise we'll
generally attempt to build the VDSO for the architecture of the build
machine rather than for MIPS.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20154/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

Our genvdso tool performs some rather paranoid checking that the VDSO
library isn't attempting to make use of a GOT by constraining the number
of entries that the GOT is allowed to contain to the minimum 2 entries
that are always generated by binutils.

Unfortunately lld prior to revision 334390 generates a third entry,
which is unused & thus harmless but falls foul of genvdso's checks &
causes the build to fail.

Since we already check that the VDSO contains no relocations it seems
reasonable to presume that it also doesn't contain use of a GOT, which
would involve relocations. Thus rather than attempting to work around
this issue by allowing 3 GOT entries when using lld, simply remove the
GOT checks which seem overly paranoid.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20152/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

As there is precious little left in any DTS files referring to the
node "/chosen@0" as opposed to "/chosen", remove the two checks for
the former node name.

[paul.burton@mips.com:
  The modified yamon-dt code only operates on
  arch/mips/boot/dts/mti/sead3.dts right now, and that uses chosen
  rather than chosen@0 anyway, so this should have no behavioural
  effect.]
Signed-off-by: NRobert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20131/
Cc: linux-mips@linux-mips.org

generic_defconfig explicitly disables CONFIG_INPUT_MOUSEDEV,
CONFIG_INPUT_KEYBOARD & CONFIG_INPUT_MOUSE which results in warnings
when merging board config fragments if any of them require these
options. This is the case for the ranchu board, which means we've had
the following warning when configuring for generic platform targets
since commit f2d0b0d5 ("MIPS: ranchu: Add Ranchu as a new
generic-based board"):

  $ make ARCH=mips 32r2el_defconfig
  Using ./arch/mips/configs/generic_defconfig as base
  Merging arch/mips/configs/generic/32r2.config
  Merging arch/mips/configs/generic/el.config
  Merging ./arch/mips/configs/generic/board-sead-3.config
  Merging ./arch/mips/configs/generic/board-ranchu.config
  Value of CONFIG_INPUT_KEYBOARD is redefined by fragment ./arch/mips/configs/generic/board-ranchu.config:
  Previous value: # CONFIG_INPUT_KEYBOARD is not set
  New value: CONFIG_INPUT_KEYBOARD=y

  Merging ./arch/mips/configs/generic/board-ni169445.config
  Merging ./arch/mips/configs/generic/board-boston.config
  Merging ./arch/mips/configs/generic/board-ocelot.config
  Merging ./arch/mips/configs/generic/board-xilfpga.config
  scripts/kconfig/conf  --olddefconfig Kconfig
  #
  # configuration written to .config
  #

Resolve this by removing mention of the CONFIG_INPUT_* Kconfig symbols
from generic_defconfig, allowing them to take their default values &
allowing board config fragments to enable them without warnings.

This may be problematic if CONFIG_ARCH_MIGHT_HAVE_PC_SERIO is ever
enabled for CONFIG_MIPS_GENERIC=y configurations, but for now that isn't
the case so we can worry about that if & when it happens.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20109/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

The A() & AA() macros have been unused since commit 05e43966
("[MIPS] Use SYSVIPC_COMPAT to fix various problems on N32"), which
switched to the more standard compat_ptr().

RLIM_INFINITY32, RESOURCE32() & struct rlimit32 have been present but
unused since the beginning of the git era.

Remove the dead code.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20108/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

The sys_32_mmap2 function has been unused since we started using syscall
wrappers in commit dbda6ac0 ("MIPS: CVE-2009-0029: Enable syscall
wrappers."), and is indeed identical to the sys_mips_mmap2 function that
replaced it in sys32_call_table.

Remove the dead code.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20107/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

Our sigreturn functions make use of a macro named nabi_no_regargs to
declare 8 dummy arguments to a function, forcing the compiler to expect
a pt_regs structure on the stack rather than in argument registers. This
is an ugly hack which unnecessarily causes these sigreturn functions to
need to care about the calling convention of the ABI the kernel is built
for. Although this is abstracted via nabi_no_regargs, it's still ugly &
unnecessary.

Remove nabi_no_regargs & the struct pt_regs argument from sigreturn
functions, and instead use current_pt_regs() to find the struct pt_regs
on the stack, which works cleanly regardless of ABI.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20106/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

Ocelot PCB123 has a SPI NOR connected on its SPI bus.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20103/
Cc: Mark Brown <broonie@kernel.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-spi@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Allan Nielsen <allan.nielsen@microsemi.com>

Add support for the SPI controller
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20101/
Cc: Mark Brown <broonie@kernel.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-spi@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Allan Nielsen <allan.nielsen@microsemi.com>

Systems based upon the Loongson 1B & 1C CPUs share the same load
address, as do those based upon Loongson 1A. Unify the definition of
this load address to reduce duplication & avoid the need for an extra
Loongson 1A case in future.

[paul.burton@mips.com: Rewrite commit message.]
Signed-off-by: N谢致邦 (XIE Zhibang) <Yeking@Red54.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/14927/
Cc: linux-mips@linux-mips.org

LS232 (Loonson 2-issue 32-bit, also called GS232 (Godson 2-issue 32-bit))
is the CPU core (microarchitecture) of Loongson 1A/1B/1C.

According to "LS232 用户手册 (LS232 User Manual)", LS232 implements the
MIPS32 Release 1 instruction set, and part of the MIPS32 Release 2
instruction set.

In the manual, LS232 implements all of the MIPS32R2 instruction set
except the FPU instructions, and LS232 also implements 5 FPU
instructions of the MIPS32R2 instruction set: CEIL.L.fmt, CVT.L.fmt,
FLOOR.L.fmt, TRUNC.L.fmt, and ROUND.L.fmt.

But a bug of the DI instruction has been found during tests, the DI
instruction can not disable interrupts in arch_local_irq_disable() with
CONFIG_PREEMPT_NONE=y and CFLAGS='-mno-branch-likely' in some cases.

[paul.burton@mips.com:
  - Remove the _MIPS_ISA redefinition to match the change made for the
    generic MIPSr1 CPUs by commit 344ebf09 ("MIPS: Always use
    -march=<arch>, not -<arch> shortcuts").]
Signed-off-by: N谢致邦 (XIE Zhibang) <Yeking@Red54.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/16155/
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org

The GPIO controller also serves as an interrupt controller for events
on the GPIO it handles.

An interrupt occurs whenever a GPIO line has changed.
Signed-off-by: NQuentin Schulz <quentin.schulz@bootlin.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20015/
Cc: robh+dt@kernel.org
Cc: mark.rutland@arm.com
Cc: ralf@linux-mips.org
Cc: jhogan@kernel.org
Cc: linux-gpio@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: thomas.petazzoni@bootlin.com

Enable CONFIG_MIPS_AUTO_PFN_OFFSET for the generic platform, allowing
it to avoid wasted book-keeping for pages with addresses lower than the
physical base address of memory.

This has a minimal impact on kernel text size, with 64r6el_defconfig
gaining 0.1% in size as reported by bloat-o-meter:

  add/remove: 4/1 grow/shrink: 345/13 up/down: 9017/-392 (8625)
  Function                                     old     new   delta
  pcpu_setup_first_chunk                      1444    1780    +336
  pcpu_alloc_first_chunk                       864    1136    +272
  start_kernel                                1064    1288    +224
  initcall_blacklist                           224     372    +148
  try_fill_recv                               2088    2184     +96
  ...
  Total: Before=8457273, After=8465898, chg +0.10%

The gain for systems with large offsets to physical memory & the ability
to continue using generic kernels on such systems seems well worth this
small cost.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Suggested-by: NVladimir Kondratiev <vladimir.kondratiev@intel.com>
Patchwork: https://patchwork.linux-mips.org/patch/20049/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

On systems where physical memory begins at a non-zero address, defining
PHYS_OFFSET (which influences ARCH_PFN_OFFSET) can save us time & memory
by avoiding book-keeping for pages from address zero to the start of
memory.

Some MIPS platforms already make use of this, but with the definition of
PHYS_OFFSET being compile-time constant it hasn't been possible to
enable this optimization for a kernel which may run on systems with
varying physical memory base addresses.

Introduce a new Kconfig option CONFIG_MIPS_AUTO_PFN_OFFSET which, when
enabled, makes ARCH_PFN_OFFSET a variable & detects it from the boot
memory map (which for example may have been populated from DT). The
relationship with PHYS_OFFSET is reversed, with PHYS_OFFSET now being
based on ARCH_PFN_OFFSET. This is because ARCH_PFN_OFFSET is used far
more often, so avoiding the need for runtime calculation gives us a
smaller impact on kernel text size (0.1% rather than 0.15% for
64r6el_defconfig).
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Suggested-by: NVladimir Kondratiev <vladimir.kondratiev@intel.com>
Patchwork: https://patchwork.linux-mips.org/patch/20048/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

isa_virt_to_bus() & isa_bus_to_virt() claim to treat ISA bus addresses
as being identical to physical addresses, but they fail to do so in the
presence of a non-zero PHYS_OFFSET.

Correct this by having them use virt_to_phys() & phys_to_virt(), which
consolidates the calculations to one place & ensures that ISA bus
addresses do indeed match physical addresses.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20047/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: Vladimir Kondratiev <vladimir.kondratiev@intel.com>

Converting an address between cached & uncached (typically addresses in
(c)kseg0 & (c)kseg1 or 2 xkphys regions) should not depend upon
PHYS_OFFSET in any way - we're converting from a virtual address in one
unmapped region to a virtual address in another unmapped region.

For some reason our CAC_ADDR() & UNCAC_ADDR() macros make use of
PAGE_OFFSET, which typically includes PHYS_OFFSET. This means that
platforms with a non-zero PHYS_OFFSET typically have to workaround
miscalculation by these 2 macros by also defining UNCAC_BASE to a value
that isn't really correct.

It appears that an attempt has previously been made to address this with
commit 3f4579252aa1 ("MIPS: make CAC_ADDR and UNCAC_ADDR account for
PHYS_OFFSET") which was later undone by commit ed3ce16c ("Revert
"MIPS: make CAC_ADDR and UNCAC_ADDR account for PHYS_OFFSET"") which
also introduced the ar7 workaround. That attempt at a fix was roughly
equivalent, but essentially caused the CAC_ADDR() & UNCAC_ADDR() macros
to cancel out PHYS_OFFSET by adding & then subtracting it again. In his
revert Leonid is correct that using PHYS_OFFSET makes no sense in the
context of these macros, but appears to have missed its inclusion via
PAGE_OFFSET which means PHYS_OFFSET actually had an effect after the
revert rather than before it.

Here we fix this by modifying CAC_ADDR() & UNCAC_ADDR() to stop using
PAGE_OFFSET (& thus PHYS_OFFSET), instead using __pa() & __va() along
with UNCAC_BASE.

For UNCAC_ADDR(), __pa() will convert a cached address to a physical
address which we can simply use as an offset from UNCAC_BASE to obtain
an address in the uncached region.

For CAC_ADDR() we can undo the effect of UNCAC_ADDR() by subtracting
UNCAC_BASE and using __va() on the result.

With this change made, remove definitions of UNCAC_BASE from the ar7 &
pic32 platforms which appear to have defined them only to workaround
this problem.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
References: 3f4579252aa1 ("MIPS: make CAC_ADDR and UNCAC_ADDR account for PHYS_OFFSET")
References: ed3ce16c ("Revert "MIPS: make CAC_ADDR and UNCAC_ADDR account for PHYS_OFFSET"")
Patchwork: https://patchwork.linux-mips.org/patch/20046/
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: Vladimir Kondratiev <vladimir.kondratiev@intel.com>

of_find_compatible_node() returns a device_node pointer with refcount
incremented and must be decremented explicitly.
 As this code is using the result only to check presence of the interrupt
controller (!NULL) but not actually using the result otherwise the
refcount can be decremented here immediately again.
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19820/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

The call to of_find_node_by_name returns a node pointer with refcount
incremented thus it must be explicitly decremented here after the last
usage.
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19558/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

VDSO code should not be using smp_processor_id(), since it is executed
in user mode.
Introduce a VDSO-specific path which will cause a compile-time
or link-time error (depending upon support for __compiletime_error) if
the VDSO ever incorrectly attempts to use smp_processor_id().

[Matt Redfearn <matt.redfearn@imgtec.com>: Move before change to
smp_processor_id in series]
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Signed-off-by: NMatt Redfearn <matt.redfearn@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/17932/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org

Now that the GPIO driver support interrupts we don't need to poll the
buttons.
Signed-off-by: NAlban Bedel <albeu@free.fr>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/15283/
Cc: linux-mips@linux-mips.org
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

mips_swiotlb_ops differs from the generic swiotlb_dma_ops only in that
it contains a mb() barrier after each operations that maps or syncs
dma memory to the device.

The dma operations are defined to not be memory barriers, but instead
the write* operations to kick the DMA off are supposed to contain them.

For mips this handled by war_io_reorder_wmb(), which evaluates to the
stronger wmb() instead of the pure compiler barrier barrier() for
just those platforms that use swiotlb, so I think we are covered
properly.

[paul.burton@mips.com:
  - Include linux/swiotlb.h to fix build failures for configs with
    CONFIG_SWIOTLB=y.]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20038/
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: linux-mips@linux-mips.org
Cc: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org

If a driver causes DMA cache maintenance with a zero length then we
currently BUG and kill the kernel. As this is a scenario that we may
well be able to recover from, WARN & return in the condition instead.
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/14623/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

The binding for the USB PHY went thru before the driver. However the
new version of the driver now use the PHY core support for reset, and
this expect the reset to be named "phy". So remove the "usb-" prefix
from the the reset names.
Signed-off-by: NAlban Bedel <albeu@free.fr>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/15282/
Cc: linux-kernel@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org

There is an additional MIIM (MDIO) bus in this SoC so let's declare it
in the dtsi.

This bus requires GPIO 14 and 15 pins that need to be muxed. There is no
support for internal PHY reset on this bus on the contrary of MIIM0 so
there is only one register address space and not two.
Signed-off-by: NQuentin Schulz <quentin.schulz@bootlin.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20014/
Cc: robh+dt@kernel.org
Cc: mark.rutland@arm.com
Cc: ralf@linux-mips.org
Cc: jhogan@kernel.org
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: thomas.petazzoni@bootlin.com

The length of memory address space for MIIM0 is from 0x7107009c to
0x710700bf included which is 36 bytes long in decimal, or 0x24 bytes in
hexadecimal and not 0x36.

Fixes: 49b03169 ("MIPS: mscc: Add switch to ocelot")
Signed-off-by: NQuentin Schulz <quentin.schulz@bootlin.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20013/
Cc: robh+dt@kernel.org
Cc: mark.rutland@arm.com
Cc: ralf@linux-mips.org
Cc: jhogan@kernel.org
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: thomas.petazzoni@bootlin.com

The RTC definitions were moved to the driver, remove them from the platform
header.

[paul.burton@mips.com:
  - Also remove the unused tx4939_rtcptr which would use struct
    tx4939_rtc_reg if it were ever expanded.]
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20024/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org

The ar724x pci driver expects the PCIe controller to be brought out of
reset by the bootloader.

At least the AVM Fritz 300E bootloader doesn't take care of releasing
the different PCIe controller related resets which causes an endless
hang as soon as either the PCIE Reset register (0x180f0018) or the PCI
Application Control register (0x180f0000) is read from.

Do the full "PCIE Root Complex Initialization Sequence" if the PCIe
host controller is still in reset during probing.

The QCA u-boot sleeps 10ms after the PCIE Application Control bit is
set to ready. It has been shown that 10ms might not be enough time if
PCIe should be used right after setting the bit. During my tests it
took up to 20ms till the link was up. Giving the link up to 100ms
should work for all cases.
Signed-off-by: NMathias Kresin <dev@kresin.me>
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19916/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

This patch ensures, that the pinmux register is properly setup for the
boot console UART when early_printk is enabled.

[paul.burton@mips.com:
  - s/poinmux/pinmux/
  - s/uart/UART/
  - Drop extraneous parentheses.]
Signed-off-by: NGabor Juhos <juhosg@openwrt.org>
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

This patch adds a few additional cpu feature overrides so that they do not
need to be probed at runtime.
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19914/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

This patch disables irq on reboot to fix hang issues that were observed
due to pending interrupts.
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19913/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

The pinmux on QCA SoCs is controlled by a single register. The
"pinctrl-single" driver can be used but requires the target
to select PINCTRL.
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19909/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

This patch adds support for 2 new types of QCA silicon. TP9343 is
essentially the same as the QCA956X but is licensed by TPLink.
Signed-off-by: NWeijie Gao <hackpascal@gmail.com>
Signed-off-by: NMatthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19911/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

This patch adds many new registers for various QCA MIPS SoCs. The patch is
an aggragate of many contributions made to OpenWrt.
Signed-off-by: NGabor Juhos <juhosg@openwrt.org>
Signed-off-by: NHenryk Heisig <hyniu@o2.pl>
Signed-off-by: NMatthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: NWeijie Gao <hackpascal@gmail.com>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NJulien Dusser <julien.dusser@free.fr>
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19910/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

Ocelot now has a u-boot port, allow building FIT images instead of relying
on the legacy detection and builtin DTB.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: NJames Hogan <jhogan@kernel.org>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19632/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

Get rid of extern declarations in .c functions and included
the necessary header file. Also remove unused UART declares.
Signed-off-by: NSteven J. Hill <steven.hill@cavium.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19477/
Cc: linux-mips@linux-mips.org

It is not immediately obvious what the expected inputs to these fault
handlers is and how they calculate the number of unset bytes. Having
stared deeply at this in order to fix some corner cases, add some
comments to assist those who follow.
Signed-off-by: NMatt Redfearn <matt.redfearn@mips.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19339/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: <linux-mips@linux-mips.org>
Cc: <linux-kernel@vger.kernel.org>

The __clear_user function is defined to return the number of bytes that
could not be cleared. From the underlying memset / bzero implementation
this means setting register a2 to that number on return. Currently if a
page fault is triggered within the MIPSr6 version of setting of initial
unaligned bytes, the value loaded into a2 on return is meaningless.

During the MIPSr6 version of the initial unaligned bytes block, register
a2 contains the number of bytes to be set beyond the initial unaligned
bytes. The t0 register is initally set to the number of unaligned bytes
- STORSIZE, effectively a negative version of the number of unaligned
bytes. This is then incremented before each byte is saved.

The label .Lbyte_fixup\@ is jumped to on page fault. Currently the value
in a2 is incorrectly replaced by 0 - t0 + 1, effectively the number of
unaligned bytes remaining. This leads to the failures being reported by
the following test code:

static int __init test_clear_user(void)
{
	int j, k;

	pr_info("\n\n\nTesting clear_user\n");
	for (j = 0; j < 512; j++) {
		if ((k = clear_user(NULL+3, j)) != j) {
			pr_err("clear_user (NULL %d) returned %d\n", j, k);
		}
	}
	return 0;
}
late_initcall(test_clear_user);

Which reports:
[    3.965439] Testing clear_user
[    3.973169] clear_user (NULL 8) returned 6
[    3.976782] clear_user (NULL 9) returned 6
[    3.980390] clear_user (NULL 10) returned 6
[    3.984052] clear_user (NULL 11) returned 6
[    3.987524] clear_user (NULL 12) returned 6

Fix this by subtracting t0 from a2 (rather than $0), effectivey giving:
unset_bytes = (#bytes - (#unaligned bytes)) - (-#unaligned bytes remaining + 1) + 1
     a2     =             a2                -              t0                   + 1

This fixes the value returned from __clear user when the number of bytes
to set is > LONGSIZE and the address is invalid and unaligned.

Unfortunately, this breaks the fixup handling for unaligned bytes after
the final long, where register a2 still contains the number of bytes
remaining to be set and the t0 register is to 0 - the number of
unaligned bytes remaining.

Because t0 is now is now subtracted from a2 rather than 0, the number of
bytes unset is reported incorrectly:

static int __init test_clear_user(void)
{
	char *test;
	int j, k;

	pr_info("\n\n\nTesting clear_user\n");
	test = vmalloc(PAGE_SIZE);

	for (j = 256; j < 512; j++) {
		if ((k = clear_user(test + PAGE_SIZE - 254, j)) != j - 254) {
			pr_err("clear_user (%px %d) returned %d\n",
				test + PAGE_SIZE - 254, j, k);
		}
	}
	return 0;
}
late_initcall(test_clear_user);

[    3.976775] clear_user (c00000000000df02 256) returned 4
[    3.981957] clear_user (c00000000000df02 257) returned 6
[    3.986425] clear_user (c00000000000df02 258) returned 8
[    3.990850] clear_user (c00000000000df02 259) returned 10
[    3.995332] clear_user (c00000000000df02 260) returned 12
[    3.999815] clear_user (c00000000000df02 261) returned 14

Fix this by ensuring that a2 is set to 0 during the set of final
unaligned bytes.
Signed-off-by: NMatt Redfearn <matt.redfearn@mips.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Fixes: 8c56208a ("MIPS: lib: memset: Add MIPS R6 support")
Patchwork: https://patchwork.linux-mips.org/patch/19338/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # v4.0+

Many architectural features have over time moved from being optional to
either be required or removed by newer architecture releases. This means
that in many cases we can know at compile time whether a feature will be
supported or not purely due to the knowledge we have about the ISA the
kernel build is targeting.

This patch introduces a bunch of utility macros for checking for
supported options, ASEs & combinations of those with ISA revisions. It
then makes use of these in the default definitions of cpu_has_* macros.
The result is that many of the macros become compile-time constant,
allowing more optimisation opportunities for the compiler - particularly
with kernels built for later ISA revisions.

To demonstrate the effect of this patch, the following table shows the
size in bytes of the kernel binary as reported by scripts/bloat-o-meter
for v4.12-rc4 maltasmvp_defconfig kernels with & without this patch. A
variant of maltasmvp_defconfig with CONFIG_CPU_MIPS32_R6 selected is
also shown, to demonstrate that MIPSr6 systems benefit more due to extra
features becoming required by that architecture revision. Builds of
pistachio_defconfig are also shown, as although this is a MIPSr2
platform it doesn't hardcode any features in a machine-specific
cpu-feature-overrides.h, which allows it to gain more from this patch
than the equivalent Malta r2 build.

     Config         | Before  | After   |  Change
    ----------------|---------|---------|---------
     maltasmvp      | 7248316 | 7247714 |    -602
     maltasmvp + r6 | 6955595 | 6950777 |   -4818
     pistachio      | 8650977 | 8363898 | -287079
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/16360/
Cc: Joshua Kinard <kumba@gentoo.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org