This patch addresses a couple of related problems:

1) The kernel may reside in physical memory outside of the ranges set
   by plat_mem_setup().  If this is the case, init mem cannot be
   reused as it resides outside of the range of pages that the kernel
   memory allocators control.

2) initrd images might be loaded in physical memory outside of the
   ranges set by plat_mem_setup().  The memory likewise cannot be
   reused.  The patch doesn't handle this specific case, but the
   infrastructure is useful for future patches that do.

The crux of the problem is that there are memory regions that need be
memory_present(), but that cannot be free_bootmem() at the time of
arch_mem_init().  We create a new type of memory (BOOT_MEM_INIT_RAM)
for use with add_memory_region().  Then arch_mem_init() adds the init
mem with this type if the init mem is not already covered by existing
ranges.

When memory is being freed into the bootmem allocator, we skip the
BOOT_MEM_INIT_RAM ranges so they are not clobbered, but we do signal
them as memory_present().  This way when they are later freed, the
necessary memory manager structures have initialized and the Sparse
allocater is prevented from crashing.

The Octeon specific code that handled this case is removed, because
the new general purpose code handles the case.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1988/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

OCTEON II has a new dma to phys mapping method for PCIe.  Define
OCTEON_DMA_BAR_TYPE_PCIE2 to denote this case, and handle it.

OCTEON II also needs a swiotlb if the OHCI USB driver is enabled, so
allocate this too.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2983/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NDavid Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Patchwork: https://patchwork.linux-mips.org/patch/2941/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Many new types of boards exist, so lets recognize them.
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Patchwork: https://patchwork.linux-mips.org/patch/2940/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NDavid Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Patchwork: https://patchwork.linux-mips.org/patch/2942/
Patchwork: https://patchwork.linux-mips.org/patch/3012/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Several newer chips were not covered, update the code to detect them.
This necessitates updating cvmx-mio-defs.h as well, because it has new
and required definitions.
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2939/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Panic() invokes printk() to add a \n internally, so panic arguments should
not themselves end in \n.  Panic invocations in arch/mips and elsewhere
are inconsistently sometimes terminating in \n, sometimes not.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The parse_mtd_partitions() and mtd_device_register() functions were
combined into mtd_device_parse_register().  So call that instead.
Signed-off-by: NDavid Daney <david.daney@cavium.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2923/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This is to exclude it from force threading to allow RT patch set to work.
And while on this line
* Remove IRQF_DISABLED as as this flag is NOOP
* Add IRQF_PERCPU as this is a per cpu interrupt.
Signed-off-by: NVenkat Subbiah <venkat.subbiah@cavium.com>
Acked-by: NDavid Daney <david.daney@cavium.com>
To: linux-mips@linux-mips.org
To: linux-rt-users@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/2817/Acked-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Or else we get lots of variations on this:

arch/mips/pci/pci.c:330: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL'

scattered throughout the build.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>

Convert to mtd_device_register() and remove the CONFIG_MTD_PARTITIONS
preprocessor conditionals as partitioning is always available.

Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NJamie Iles <jamie@jamieiles.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

We only use the three low-order mailbox bits.  Leave the upper bits alone
for possible use by drivers and other software.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2090/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Octeon uses different interrupt irq for timer and performance counters.
Set CvmCtl[IPPCI] to correct irq value very early.
Signed-off-by: NChandrakala Chavva <cchavva@caviumnetworks.com>
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Cc: Chandrakala Chavva <cchavva@caviumnetworks.com>
Patchwork: https://patchwork.linux-mips.org/patch/2085/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Instead of making each Octeon specific option depend on
CPU_CAVIUM_OCTEON, gate the body of the entire file with
CPU_CAVIUM_OCTEON.  With this change, CAVIUM_OCTEON_SPECIFIC_OPTIONS
becomes useless, so get rid of it as well.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2091/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

For future rework of try_to_wake_up() we'd like to push part of that
function onto the CPU the task is actually going to run on.

In order to do so we need a generic callback from the existing scheduler IPI.

This patch introduces such a generic callback: scheduler_ipi() and
implements it as a NOP.

BenH notes: PowerPC might use this IPI on offline CPUs under rare conditions!
Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: NChris Metcalf <cmetcalf@tilera.com>
Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
Reviewed-by: NFrank Rowand <frank.rowand@am.sony.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110405152728.744338123@chello.nl

Fixes generated by 'codespell' and manually reviewed.
Signed-off-by: NLucas De Marchi <lucas.demarchi@profusion.mobi>

Make use of the IRQCHIP_ONOFFLINE_ENABLED flag and remove the
wrappers. Use irqd_irq_disabled() instead of desc->status, which will
go away.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Tested-by: NDavid Daney <ddaney@caviumnetworks.com>

This includes conversion to new style irq_chip functions, and
correctly enabling/disabling per-CPU interrupts.

The hardware interrupt bit to irq number mapping is now done with a
flexible map, instead of by bit twiddling the irq number.

[ tglx: Adjusted to new irq_cpu_on/offline callbacks and
        __irq_set_affinity_lock ]
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org
LKML-Reference: <1301081931-11240-5-git-send-email-ddaney@caviumnetworks.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

This converts the mips clocksources to use clocksource_register_hz/khz

CC: Ralf Baechle <ralf@linux-mips.org>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NJohn Stultz <johnstul@us.ibm.com>

Declare that OCTEON reference boards have both OHCI and EHCI.

Add platform devices for the corresponding hardware.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-usb@vger.kernel.org
To: dbrownell@users.sourceforge.net
Patchwork: http://patchwork.linux-mips.org/patch/1676/Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The CN63XXP1 needs a couple of workarounds to ensure memory is not written
in unexpected ways.

All PREF with hints in the range 0-4,6-24 are replaced with PREF 28.  We
pass a flag to the assembler to cover compiler generated code, and patch
uasm for the dynamically generated code.

The write buffer threshold is reduced to 4.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1672/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The I2C and UARTS are clocked by the I/O clock, use its rate for these
devices.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1670/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Starting with cn63xx Octeon I/O blocks are clocked at a different rate
than the CPU.  Add a new function octeon_get_io_clock_rate() that
yields the I/O clock rate.

Also rearrange octeon_get_clock_rate() to get the value from the saved
sysinfo structure.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1671/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

We can run with any simulator clock rate.  Get rid of the code
overriding it to 6MHz.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1669/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The per-CPU clocks are synchronized from IPD_CLK_COUNT, on cn63XX it must
be scaled by the clock frequency ratio.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1667/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The CN63XX has a different L2 cache architecture.  Update the helper
functions to reflect this.

Some joining of split lines was also done to improve readability, as
well as reformatting of comments.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1663/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

All Octeon chips can support more than 4GB of RAM.  Also due to how Octeon
PCI is setup, even some configurations with less than 4GB of RAM will have
portions that are not accessible from 32-bit devices.

Enable the swiotlb code to handle the cases where a device cannot directly
do DMA.  This is a complete rewrite of the Octeon DMA mapping code.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1639/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This allows follow-on patches to dma mapping functions to work with
the octeon mgmt device..
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1632/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Add missing #inclusions of <linux/irq.h> to a whole bunch of files that should
really include it.  Note that this can replace #inclusions of <asm/irq.h>.

This is required for the patch to sort out irqflags handling function naming to
compile on MIPS.

The problem is that these files require access to things like setup_irq() -
which isn't available by #including <linux/interrupt.h>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NRalf Baechle <ralf@linux-mips.org>

It is an early_initcall, so it should be in __init memory.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1593/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This patch adds an config switch to determine if we need to build some
workaround helper files.

The staging driver octeon-ethernet references some symbols which are only
built when PCI is enabled. The new config switch enables these symbols in
bothe cases.
Signed-off-by: NAndreas Bießmann <biessmann@corscience.de>
To: linux-kernel@vger.kernel.org
Cc: Andreas Bießmann <biessmann@corscience.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1543/Acked-by: NDavid Daney <ddaney@caviumnetworks.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

We reserve the 3.75GB - 4GB region of PCIe address space for device to
device transfers, making the corresponding physical memory under
direct mapping unavailable for DMA.

To allow for PCIe DMA to all physical memory we map this chunk of
physical memory with BAR1.  Because of the resulting discontinuity in
the mapping function, we remove a page of memory at each end of the
range so multi-page DMA buffers can never be allocated that span the
range.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1535/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The forthcoming watchdog driver will use it.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
To: wim@iguana.be
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1499/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Power throttling make deterministic delay loops impossible.
Re-implement delays using the cycle counter.  This also allows us to
get rid of the code that calculates loops per jiffy.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1317/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

* Rename camel-case InitTLBStart_addr to octeon_bootloader_entry_addr.

* Convert calls to cvmx_read64_uint32(), to simple pointer
  dereferences.

* Set proper ebase.

* Don't confuse coreid and cpu numbers.

* Try to maintain consistent bootloader coremask.

* Update the signature and boot_init_vector of supported bootloaders.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1491/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1490/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Also number offline CPUs that could potentially be brought on-line
later.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1489/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The original version went behind the back of everything, leaving
things in an inconsistent state.

Now we use the irq_set_affinity() to do the work for us.  This has the
advantage that the IRQ core's view of the affinity stays consistent.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1486/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The main change is to change most of the IRQs from handle_percpu_irq
to handle_fasteoi_irq.  This necessitates extracting all the .ack code
to common functions that are not exposed to the irq core.

The affinity code now acts more sanely, by doing round-robin
distribution instead of broadcasting.

Because of the change to handle_fasteoi_irq and affinity, some of the
IRQs had to be split into separate groups with their own struct
irq_chip to prevent undefined operations on specific IRQ lines.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1485/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Put all the MSI code in one place (msi-octeon.c).  This simplifies
octeon-irq.c and gets rid of some ugly #ifdefs
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1484/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>