This fetches the device tree file like it is specified in the MIPS UHI
interface if one was found. This is also used when the device tree file
was appended to the kernel image with cat.
This code is copied from arch/mips/bmips/setup.c.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12898/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Add DTS for EdgeRouter Lite that is usable as is without any "pruning"
with APPENDED_DTB.

Compared to builtin generic DTB, we can avoid errors and delays from
probing non-existent I2C devices.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Add DTS for D-Link DSR-1000N that is usable as is without any "pruning"
with APPENDED_DTB. Split out the common parts from octeon_3xxx.dts
into octeon_3xxx.dtsi.

Compared to builtin generic DTB, we can specificy fixed links properly
and avoid probing non-existent I2C devices.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12840/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

MIPS wants to sleep 5 seconds before panicking when panic_on_oops is set,
with no apparent reason. Remove this feature, since some users may want
their systems to fail as quickly as possible.

Users who want to delay reboot after panic can use PANIC_TIMEOUT.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-mips@linux-mips.org
Cc: linux-parisc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12845/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Broadcom ARM home routers store SPROM content in NVRAM just like MIPS
ones. To share SPROM code we need to move it out of arch/mips/ to some
common place. We already have bcm47xx_nvram in firmware path and SPROM
should fit there as well.
This driver is responsible for parsing SoC configuration data into a
struct shared between ssb and bcma buses.
This was tested with BCM4706 & BCM5357C0 (BCM47XX) and BCM4708A0
(ARCH_BCM_5301X).
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12210/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The reset_ops structure is never modified. Make it const.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Cc: kernel@pengutronix.de
Patchwork: https://patchwork.linux-mips.org/patch/12618/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The reset_ops structure is never modified. Make it const.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Cc: kernel@pengutronix.de
Patchwork: https://patchwork.linux-mips.org/patch/12619/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Fill MAC addresses from bootinfo when using appended DTB.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12590/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Don't fill MAC address if it's already set. This allows DTB to
override the bootinfo.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12589/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Use separate pass to fill MAC addresses. This is needed because we want
to do this also for the appended DTB.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12588/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Use model string from DTB for board type if the board is unknown.
This is more informative, e.g. with EdgeRouter Pro the /proc/cpuinfo
will display "ubnt,e200 (CN6120p1.1-1000-NSP)" instead of misleading
"Unsupported Board".
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12582/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Initialize system type string after device tree init.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12583/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Return NULL for unsupported board.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12581/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Use the trigger type passed in to the function instead of reading it
back out of the irq_data.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12501/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

OCTEON chips with the CIU3 interrupt controller use a different IPI
mechanism that previous models.

Add plat_smp_ops for the cn78xx and probing code to choose between the
two types of ops.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12499/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Add irq_chip support for both IPI and "normal" interrupts of the CIU3
controller.  Document the device tree binding for the CIU3.

Some functions are non-static as they will be used by follow-on
support for MSI-X.
Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Rob Herring <robh@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: devicetree@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12500/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Attempts to read the nonexistent registers results in bus errors.
Either use registers that exist, or don't do the access as appropriate.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12502/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Follow on patchs need to be able to distinguish the new models.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12498/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

These new members of the OCTEON III family have some new registers,
update some of the definitions for use in follow on patches.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12497/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Per the subject, always select HANDLE_DOMAIN_IRQ, and implement
set_irq_regs() so that it actually works.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12496/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Follow-on patches for OCTEON III will increase the number of irqs to
potentially more than 256.

Increase the width of the octeon_irq_ciu_to_irq to int to be able to
handle this case.  Remove the hacky code that verified that u8 would
not be overflowed.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12495/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

To support more than 48 CPUs, the bootinfo structure grows a new
coremask structure.  Add the definition of the structure and add it to
struct cvmx_bootinfo.  In prom_init(), copy the new coremask data into
the sysinfo structure, and use it in smp_setup().
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12319/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Get rid of the long unused code.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12318/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Add new processor identifiers for Cavium CN73xx and CNF75xx
processors, and probe for them in cpu-probe.c
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12311/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

It was calling flush_cache_all() which is a no-op since a long time anyway
and which was overkill in the old days when it was actually doing something
because only the D-cache needs to be flushed, never the I-cache, never
the S-cache.  Since however highmem on MIPS is still only supported on
processors that don't suffer from cache aliases, we could turn
flush_cache_kmaps() into a no-op - but for paranoia's sake we rather make
it BUG_ON(cpu_has_dc_aliases()).
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

flush_cache_all() is a nop and loongson 3 is fully coherent.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

It's probably a good idea to flush caches before reset and by the time
this code was written flush_cache_all did actually still do something.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Flushing caches is probably sensible on reset but flush_cache_all has been
a no-op for a very long time.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

flush_cache_all will go away.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Don't set _machine_restart() on OF machines as the reset driver
now provides a system restart handler.
Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12235/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Reuse the early printk code to support the serial in zboot. We copy
early_printk.c instead of referencing it because we need to build a
different object file for the normal kernel and zboot.
Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Alex Smith <alex.smith@imgtec.com>
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12234/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Now that appended DTB is usable we can drop the builtin DTB support.
Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12231/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

This is needed for bootloader supporting UHI and to support appended
DTB.
Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12230/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

A couple of netlogic assembly files define CP0_EBASE to $15, the same as
CP0_PRID in mipsregs.h, and use it for accessing both CP0_PRId and
CP0_EBase registers. However commit 609cf6f2 ("MIPS: CPS: Early
debug using an ns16550-compatible UART") added a different definition of
CP0_EBASE to mipsregs.h, which included a register select of 1. This
causes harmless build warnings like the following:

  arch/mips/netlogic/common/reset.S:53:0: warning: "CP0_EBASE" redefined
  #define CP0_EBASE $15
  ^
  In file included from arch/mips/netlogic/common/reset.S:41:0:
  ./arch/mips/include/asm/mipsregs.h:63:0: note: this is the location of the previous definition
  #define CP0_EBASE $15, 1
  ^

Update the code to use the definitions from mipsregs.h for accessing
both registers.

Fixes: 609cf6f2 ("MIPS: CPS: Early debug using an ns16550-compatible UART")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13183/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Update the recent changes to set_pte() that were added in 46011e6e
to handle R10000_LLSC_WAR, and format the assembly to match other areas
of the MIPS tree using the same WAR.

This also incorporates a patch recently sent in my Markos Chandras,
"Remove local LL/SC preprocessor variants", so that patch doesn't need
to be applied if this one is accepted.
Signed-off-by: Joshua Kinard <kumba@gentoo.org>
Fixes: 46011e6e ("MIPS: Make set_pte() SMP safe.)
Cc: David Daney <david.daney@cavium.com>
Cc: Linux/MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/11103/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Inspired by Markos Chandras' patch.  I just didn't want do pull bitsops.h
into pgtable.h.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
References: https://patchwork.linux-mips.org/patch/11052/

Building an MSA capable kernel with a toolchain that supports MSA
produces warnings such as this:

arch/mips/kernel/r4k_fpu.S:229: Warning: the `msa' extension requires 64-bit FPRs

This is due to ".set msa" without ".set fp=64" in the non doubleword MSA
load/store macros, since MSA requires the 64-bit FPU registers (FR=1).
Add the missing fp=64 in these macros to silence the warnings.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13063/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

When lockdep is enabled on a 64-bit kernel the FPR offset into the
thread structure exceeds the maximum range of the MSA ld.d/st.d
instructions. For example THREAD_FPR31 = 4644 (instead of 2448), while
the signed immediate field is only 10 bits with an implicit multiply by
8, giving a maximum offset of 511*8 = 4088.

This isn't a problem when the toolchain doesn't support MSA as the
ld_*/st_* macros perform the addition separately into $1 with [d]addui
which has a 16bit signed immediate field.

Fix the case where the toolchain does support MSA by doing a single
addition of THREAD_FPR0 into $1 with [d]addui, and doing the ld_*/st_*
relative to that.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13064/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The MSA ld_*/st_* assembler macros for when the toolchain doesn't
support MSA use addu to offset the base address. However it is a virtual
memory pointer so fix it to use PTR_ADDU which expands to daddu for
64-bit kernels.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 4.3.y-
Patchwork: https://patchwork.linux-mips.org/patch/13062/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

In revision 1.12 of the MSA specification, the copy_u.w instruction has
been removed for MIPS32 & the copy_u.d instruction has been removed for
MIPS64. Newer toolchains (eg. Codescape SDK essentials 2015.10) will
complain about this like so:

arch/mips/kernel/r4k_fpu.S:290: Error: opcode not supported on this
processor: mips32r2 (mips32r2) `copy_u.w $1,$w26[3]'

Since we always copy to the width of a GPR, simply use copy_s instead of
copy_u to fix this.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 4.3.x+
Patchwork: https://patchwork.linux-mips.org/patch/13061/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>