linux-toradex.git/arch/mips/mti-malta, branch v4.9.67

MIPS: Print CM error reports upon bus errors

2016-10-06T16:02:18+00:00

If a bus error occurs on a system with a MIPS Coherence Manager (CM)
then the CM may hold useful diagnostic information. Printing this out
has so far been left up to boards, with the requirement that they
register a board_be_handler function & call mips_cm_error_decode() from
there.

In order to avoid boards other than Malta needing to duplicate this
code, call mips_cm_error_decode() automatically if the board registers
no board_be_handler, and remove the Malta implementation of that.

This patch results in no functional change, but removes a further piece
of platform-specific code.

Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14350/
Signed-off-by: Ralf Baechle

MIPS: Sanitise coherentio semantics

2016-10-06T16:01:28+00:00

The coherentio variable has previously been used as a boolean value,
indicating whether the user specified that coherent I/O should be
enabled or disabled. It failed to take into account the case where the
user does not specify any preference, in which case it makes sense that
we should default to coherent I/O if the hardware supports it
(hw_coherentio is non-zero).

Introduce an enum to clarify the 3 different values of coherentio & use
it throughout the code, modifying plat_device_is_coherent() &
r4k_cache_init() to take into account the default case.

Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Cc: Paul Burton 
Patchwork: https://patchwork.linux-mips.org/patch/14347/
Signed-off-by: Ralf Baechle

MIPS: Malta: Remove custom halt implementation

2016-10-06T15:31:01+00:00

The arch code will hang the machine with an infinite loop if the board
doesn't provide an impelementation of halt - let it, rather than
duplicating it.

Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14280/
Signed-off-by: Ralf Baechle

MIPS: Malta: Use syscon-reboot driver to reboot

2016-10-06T15:31:01+00:00

Make use of the generic syscon-reboot driver to reboot the Malta board,
reducing the amount of platform code it requires.

Signed-off-by: Paul Burton 
Cc: Stephan Linz 
Cc: Jacek Anaszewski 
Cc: Bartlomiej Zolnierkiewicz 
Cc: Rob Herring 
Cc: Mark Rutland 
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14279/
Signed-off-by: Ralf Baechle

MIPS: Malta: Probe pflash via DT

2016-10-06T15:31:01+00:00

Add the DT nodes required to probe the CFI compatible parallel monitor
flash found on the Malta development board, and remove the platform
code that was previously doing it. Delete the now-empty malta-platform.c
file. Adjust the Malta defconfigs that enable MTD & the pflash/CFI
driver to enable CONFIG_MTD_PHYSMAP_OF rather than CONFIG_MTD_PHYSMAP in
order to preserve their behaviour.

Signed-off-by: Paul Burton 
Cc: Bartlomiej Zolnierkiewicz 
Cc: Rob Herring 
Cc: Mark Rutland 
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14278/
Signed-off-by: Ralf Baechle

MIPS: Malta: Probe RTC via DT

2016-10-06T15:31:01+00:00

Add the DT node required to probe the RTC, and remove the platform code
that was previously doing it.

Signed-off-by: Paul Burton 
Cc: Rob Herring 
Cc: Mark Rutland 
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14277/
Signed-off-by: Ralf Baechle

MIPS: Malta: Remove custom DT match table

2016-10-06T15:31:01+00:00

Since commit 44a7185c2ae6 ("of/platform: Add common method to populate
default bus") the Malta publish_devices initcall has essentially been a
no-op. Remove it.

Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14276/
Signed-off-by: Ralf Baechle

MIPS: Malta: Probe interrupt controllers via DT

2016-10-06T15:31:00+00:00

Probe the CPU, GIC & i8259 interrupt controllers present in the Malta
system using device tree. This enables interrupts to be provided to
devices using device tree as they are moved over to being probed using
it.

Since Malta is very configurable it's unknown whether a GIC will be
present at compile time. In order to support both cases the
malta_dt_shim code is added in order to detect whether a GIC is present,
adjusting the DT to route interrupts correctly and nop out the GIC node
if no GIC is found.

Signed-off-by: Paul Burton 
Cc: Masahiro Yamada 
Cc: Kees Cook 
Cc: Rob Herring 
Cc: Mark Rutland 
Cc: Andrew Morton 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14274/
Signed-off-by: Ralf Baechle

MIPS: Malta: Use all available DDR by default

2016-10-06T15:31:00+00:00

Malta boards can have more than 256MB DDR available, but we have
previously only made use of up to 256MB (ie. the DDR accessible via
kseg0) by default, without the user manually specifying mem= kernel
parameters. This patch causes all available DDR, as reported by the
bootloader via the ememsize or memsize environment variables or
optionally on the command line, to be used when possible without the
user needing to manually provide the memory ranges.

Malta now has 2 subtly different memory maps which have to be taken into
account when setting this up. The original memory map (referred to by
the code as v1) has up to 2GB of DDR aliased in both the upper & lower
halves of the 32 bit physical address space, with a 256MB I/O region
obscuring 0x10000000-0x1fffffff only in the lower alias. The revised v2
memory map is flat with up to 4GB DDR starting from 0x0, and the I/O
region obscures 256MB of DDR which becomes inacessible. The memory map
in use is indicated by a register provided by the rocit2 system
controller, which is checked in order to set up the kernels memory
ranges accordingly.

Signed-off-by: Paul Burton 
Cc: Masahiro Yamada 
Cc: Kees Cook 
Cc: Andrew Morton 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14273/
Signed-off-by: Ralf Baechle

MIPS: Malta: Allow PCI devices DMA to lower 2GB physical

2016-10-06T15:31:00+00:00

Set the PCI_BAR0 register in all configurations such that PCI devices
can perform DMA to all of the bottom 2GB of the physical address space.
This is imperfect if we make use of the legacy Malta memory map, but it
is an improvement on the inconsistent values setup before.

Signed-off-by: Paul Burton 
Cc: Alexander Sverdlin 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14272/
Signed-off-by: Ralf Baechle