nommu needs to be able to shift PAGE_OFFSET, so we switch it to a
non-user-visible CONFIG_PAGE_OFFSET and use that in the few places
where it matters.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Other boards require this as well, so move it out of the
rts7751r2d directory.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This implements initial math-emu support, aimed primarily at SH-3.
Signed-off-by: NTakashi YOSHII <takasi-y@ops.dti.ne.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

We have a clash with RTC_CLASS over these names, so we
change them..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Drop TIF_USERSPACE and add addr_limit to the thread_info struct.
Subsequently, use that for address checking in strnlen_user() to
ward off bogus -EFAULTs.

Make __strnlen_user() return 0 on exception, rather than -EFAULT.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Nothing exciting here, just trivial fixes..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

If a channel is not TEI capable, don't try to request_irq()..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This fixes a long-standing FIXME for G2 DMA, where we finally
wire up the IRQ handler and allow for sampling remaining bytes
while in-flight.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This adds the VoyagerGX UART to the RTS7751R2D setup
code, and cleans up a few build issues.
Signed-off-by: NManuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Inhibit mapping through page tables in __ioremap() for PCI memory
apertures on SH7751 and SH7780-style PCI controllers, translation is
not possible for these areas. For other users that map a small window
in P1/P2 space, ioremap() traps that already, and should never make
it to __ioremap().
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This cleans up quite a lot of the PCI mess that we
currently have, and attempts to consolidate the
duplication in the SH7780 and SH7751 PCI controllers.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Some kgdb cleanup. Move hexchars/highhex/lowhex to the header, so it can
be reused by sh-sci. Also drop silly ctrl_inl/outl() overloading being
done by the kgdb stub.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

We had our own version, which serves no purpose. Simply
hook SH in to the generic one.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This adds some simple PM stubs and the basic APM interfaces,
primarily for use by hp6xx, where the existing userland
expects it.
Signed-off-by: NAndriy Skulysh <askulysh@gmail.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

SE73180 can use the generic support, we just need to
wire up the IRQ demuxing.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Some of the paths were a bit broken, fix it up.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

No longer needed..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This adds support for the Renesas SH7780 development boards,
R7780RP and R7780MP.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Rewrite the store queue API for a per-cpu interface in the driver
model. The old miscdevice is dropped, due to TASK_SIZE limitations,
and no one was using it anyways.

Carve up and allocate store queue space with a bitmap, back sq
mapping objects with a slab cache, and let userspace worry about
its own prefetching.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This updates the various boards for some of the recent I/O routine
updates.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

There was a bug that got introduced when the split ptlock changes
went in where mm could be unintialized for user mappings, this
fixes it up..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

ioremap() overhaul. Add support for transparent PMB mapping, get rid of
p3_ioremap(), etc. Also drop ioremap() and iounmap() routines from the
machvec, as everyone can use the generic ioremap() API instead. For PCI
memory apertures and other special cases, use the pci_iomap() API, as
boards are already required to get the mapping right there.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Cleanup of page table allocators, using generic folded PMD and PUD
helpers. TLB flushing operations are moved to a more sensible spot.

The page fault handler is also optimized slightly, we no longer waste
cycles on IRQ disabling for flushing of the page from the ITLB, since
we're already under CLI protection by the initial exception handler.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Some modules seem to need this, so we export it..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Add support for 32-bit physical addressing through the SH-4A
Privileged Space Mapping Buffer (PMB).
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Add support for the titan board.
Signed-off-by: NJamie Lenehan <lenehan@twibble.org>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

A synco is needed before we jump to start_kernel().

While we're at it, also move the sh_cpu_init() jump until after
we've zeroed BSS, as this has caused some undesirable results
in sh_cpu_init().
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Currently when making changes to control registers, we
typically need some time for changes to take effect (8
nops, generally).  However, for sh4a we simply need to
do an icbi..

This is a simple patch for implementing a general purpose
ctrl_barrier() which functions as a control register write
barrier. There's some additional documentation in the patch
itself, but it's pretty self explanatory.

There were also some places where we were not doing the
barrier, which didn't seem to have any adverse effects on
legacy parts, but certainly did on sh4a. It's safer to have
the barrier in place for legacy parts as well in these cases,
though this does make flush_tlb_all() more expensive (by an
order of 8 nops).  We can ifdef around the flush_tlb_all()
case for now if it's clear that all legacy parts won't have
a problem with this.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Add CPU_HAS_PTEA, refactor some of the cpu flag settings.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This adds support for the I-O DATA Landisk.
Signed-off-by: Nkogiidena <kogiidena@eggplant.ddo.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

There's a bug in the Hitachi SuperH csum_partial_copy_generic()
implementation.  If the supplied length is 1 (and several alignment
conditions are met), the function immediately branches to label 4.
However, the assembly at label 4 expects the length to be stored in
register r2.  Since this has not occurred, subsequent behavior is
undefined.

This can cause bad payload checksums in TCP connections.

I've fixed the problem by initializing register r2 prior to the branch
instruction.
Signed-off-by: NOllie Wild <aaw@rincewind.tv>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

We had a pretty interesting oops happening, where copy_user_page()
was down()'ing p3map_sem[] with a bogus offset (particularly, an
offset that hadn't been initialized with sema_init(), due to the
mismatch between cpu_data->dcache.n_aliases and what was assumed
based off of the old CACHE_ALIAS value).

Luckily, spinlock debugging caught this for us, and so we drop
the old hardcoded CACHE_ALIAS for sh4 completely and rely on the
run-time probed cpu_data->dcache.alias_mask. This in turn gets
the p3map_sem[] index right, and everything works again.

While we're at it, also convert to 4-level page tables..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The syscall table has lagged behind a bit, wire up the new ones..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Merge support for SH7770 and SH7780 SH-4A subtypes.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Update oprofile build rules for additional subtypes,
particularly SH7750S/SH7091.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Allow multiple early printk consoles via earlyprintk=.

With this change earlyprintk is no longer enabled by default,
it must be specified on the kernel command line. Optionally
with ,keep to prevent unreg by tty_io.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Minor sign-extension bug in SH-specific memset()..
Signed-off-by: NToshinobu Sugioka <sugioka@itonet.co.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Newer SH7760 cuts have a range of acceptable PRR values..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This reworks some of the SH-4 cache handling code to more easily
accomodate newer-style caches (particularly for the > direct-mapped
case), as well as optimizing some of the old code.
Signed-off-by: NRichard Curnow <richard.curnow@st.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

SH-4A supports 'synco' as a barrier, sprinkle it around
the cache ops as necessary..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>