RiscPC is the only platform using the default setting for NR_IRQS,
so the default NR_IRQS doesn't really make sense; remove it and
make RiscPC provide such a definition.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

... and fix those drivers that were incorrectly relying upon
that include.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This avoids confusion with platform specific DMA implementations in
mach/dma.h
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

When ISA_DMA_API is unset, we're not implementing the ISA DMA API,
so there's no point in publishing the prototypes via asm/dma.h, nor
including the machine dependent parts of that API.

This allows us to remove a lot of mach/dma.h files which don't contain
any useful code.  Unfortunately though, some platforms put their own
private non-ISA definitions into mach/dma.h, so we leave these behind
and fix the appropriate #include statments.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Since 8d5796d2, we have allowed
PAGE_OFFSET to be configurable, so a constant virtual address
for MAX_DMA_ADDRESS is buggy.  It should be defined in terms of
PAGE_OFFSET rather than a constant virtual address.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Move the definition of MAX_DMA_ADDRESS from mach/dma.h to mach/memory.h,
thereby placing it along side its relative, ISA_DMA_THRESHOLD.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

mach/io.h doesn't need linux/mm.h.
mach/dma.h doesn't need linux/device.h, asm/page.h or mach/hardware.h
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

ixp23xx's mach/io.h claims to need linux/kernel.h for BUG().
However, this header doesn't make use of BUG().
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/timex.h.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h, mach/memory.h and mach/timex.h.  Include
this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h in mach/io.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Avoid unnecessarily pollution of the kernel's namespace by avoiding
mach/hardware.h.  Include this header file where necessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Remove __arch_base_xxx() and __ioaddrc() macros; they're obsolete and
unused.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

These definitions are unused and serve no purpose with genirq.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Let's provide an overridable default instead of having every machine
class define __virt_to_bus and __bus_to_virt to the same thing.  What
most platforms are using is bus_addr == phys_addr so such is the default.

One exception is ebsa110 which has no DMA what so ever, so the actual
definition is not important except only for proper compilation.  Also
added a comment about the special footbridge bus translation.

Let's also remove comments alluding to set_dma_addr which is not
(and should not) be commonly used.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

There is no machine class overriding this.  If non linear translations
are implemented again for some machines then this could be restored at
that time.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

The restriction on !CONFIG_HIGHMEM is unneeded since page tables are
currently never allocated with highmem pages, and actually disable PTE
dump whenever highmem is configured.  Let's have a dynamic test to better
describe the current limitation instead.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Commit 8d5796d2 allows for the vmalloc
area to be resized from the kernel cmdline.  Make sure it cannot overlap
with RAM entirely.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Make free_area() arguments pfn based, and return number of freed pages.
This will simplify highmem initialization later.

Also, codepages, datapages and initpages are actually codesize, datasize
and initsize.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Doing so will greatly simplify the bootmem initialization code as each
bank is therefore entirely lowmem or highmem with no crossing between
those zones.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Currently there are two instances of struct meminfo: one in
kernel/setup.c marked __initdata, and another in mm/init.c with
permanent storage.  Let's keep only the later to directly populate
the permanent version from arm_add_memory().

Also move common validation tests between the MMU and non-MMU cases
into arm_add_memory() to remove some duplication.  Protection against
overflowing the membank array is also moved in there in order to cover
the kernel cmdline parsing path as well.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

In all cases the kaddr is assigned an input register even though it is
modified in the assembly code.  Let's assign a new variable to the
modified value and mark those inline asm with volatile otherwise they
get optimized away because the output variable is otherwise not used.

Also fix a few conversion errors in copypage-feroceon.c and
copypage-v4mc.c.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

For similar reasons as copy_user_page(), we want to avoid the
additional kmap_atomic if it's unnecessary.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

We used to override the copy_user_page() function.  However, this
is not only inefficient, it also causes additional complexity for
highmem support, since we convert from a struct page to a kernel
direct mapped address and back to a struct page again.

Moreover, with highmem support, we end up pointlessly setting up
kmap entries for pages which we're going to remap.  So, push the
kmapping down into the copypage implementation files where it's
required.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Continuing the move away from implementations which give an excuse
for other bad implementations, convert SA1100 to lookup its singular
clock by dev_name(dev) rather than by id.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Where devices only have one consumer, passing a consumer clock ID
has no real benefit.  Remove it.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>