Presently trapped I/O is only registered if it's not explicitly disabled
for the platforms that select it openly. From the fault path this runs
through an address lookup before figuring out that nothing matches and
falls back through the error path, but we can forego the lookup
completely by testing if it's been explicitly disabled. This provides a
measurable speedup for things like qemu that rely on runtime disabling.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

These routines are unsuitable for cross-platform use and no new code
should be using them, flag them as deprecated in order to give drivers
sufficient time to migrate over.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The old ctrl in/out routines are non-portable and unsuitable for
cross-platform use. While drivers/sh has already been sanitized, there
is still quite a lot of code that is not. This converts the arch/sh/ bits
over, which permits us to flag the routines as deprecated whilst still
building with -Werror for the architecture code, and to ensure that
future users are not added.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Presently the IOREMAP_FIXED fixmaps are always defined, even if the
platform isn't capable of supporting it. Since we already have an ifdef
for it, ifdef the entries, too.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Now that cached_to_uncached works as advertized in 32-bit mode and we're
never going to be able to map < 16MB anyways, there's no need for the
special uncached section. Kill it off.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This provides a variable for tracking the uncached mapping size, and uses
it for pretty printing the uncached lowmem range. Beyond this, we'll also
be building on top of this for figuring out from where the remainder of
P2 becomes usable when constructing unrelated mappings.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This effectively neutralizes P2 by getting rid of P1 identity mapping
for all available memory and instead only establishes a single unbuffered
PMB entry (16MB -- the smallest available) that covers the kernel.

As using segmentation for abusing caching attributes in drivers is no
longer supported (and there are no drivers that can be enabled in 32-bit
mode that do this), this provides us with all of the uncached access
needs by the kernel itself.

Drivers and their ilk need to specify their caching attributes when
remapping through page tables, as usual.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

All of the cached/uncached mapping setup is duplicated for each size, and
also misses out on the 16MB case. Rather than duplicating the same iter
code for that we just consolidate it in to a helper macro that builds an
iter for each size. The 16MB case is then trivially bolted on at the end.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This cribs the pretty printing from arch/x86/mm/init_32.c to dump the
virtual memory layout on boot. This is primarily intended as a debugging
aid, given that the newer CPUs have full control over their address space
and as such have little to nothing in common with the legacy layout.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This implements dynamic probing for the system FPGA. The system reset
controller contains a fixed magic read word in order to identify the
FPGA. This just utilizes a simple loop that scans across all of the fixed
physical areas (area 0 through area 6) to locate the FPGA.

The FPGA also contains register information detailing the area mappings
and chip select settings for all of the other blocks, so this needs to be
done before we can set up anything else.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

iounmap_fixed() had a couple of bugs in it that caused it to effectively
fail at life. The total number of pages to unmap factored in the mapping
offset and aligned up to the next page boundary, which doesn't match the
ioremap_fixed() behaviour.

When ioremap_fixed() pegs a slot, the address in the mapping data already
contains the offset displacement, and the size is recorded verbatim given
that we're only interested in total number of pages required. As such, we
need to calculate the total number from the original size in the unmap
path as well.

At the same time, there was also an off-by-1 problem in the fixmap index
calculation which has also been corrected.

Previously subsequent remaps of an identical fixmap index would trigger
the pte_ERROR() in set_pte_phys():

	arch/sh/mm/init.c:77: bad pte 8053ffb0(0000781003fff506).
	arch/sh/mm/init.c:77: bad pte 8053ffb0(0000781003fff506).
	arch/sh/mm/init.c:77: bad pte 8053ffb0(0000781003fff506).
	arch/sh/mm/init.c:77: bad pte 8053ffb0(0000781003fff506).
	arch/sh/mm/init.c:77: bad pte 8053ffb0(0000781003fff506).
	arch/sh/mm/init.c:77: bad pte 8053ffb0(0000781003fff506).

With this patch in place, the iounmap-driven fixmap teardown actually
does what it's supposed to do.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This wires up the machine_ops reboot call to use the system reset
controller.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This provides a machine_ops-based reboot interface loosely cloned from
x86, and converts the native sh32 and sh64 cases over to it.

Necessary both for tying in SMP support and also enabling platforms like
SDK7786 to add support for their microcontroller-based power managers.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Presently __in_29bit_mode() is only defined for the PMB case, but
it's also easily derived from the CONFIG_29BIT and CONFIG_32BIT &&
CONFIG_PMB=n cases.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This moves out the FPGA IRQ controller setup code to its own file, in
preparation for switching off of IRL mode and having it provide its own
irq_chip.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This does a bit of refactoring of the FPGA management code. The primary
FPGA initialization is moved out to its own file in preparation for
implementing some of the more complex capabilities, a complete set of
register definitions is provided, and all of the existing users in the
board code are moved over to use the new interface instead of setting up
overlapping mappings. This also corrects the FPGA size, which previously
was chomped off at the SDIF control register.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Usually we can look to the CVR to work out whether we have an FPU or not.
Unfortunately not all parts comply with this, so just set the flag
manually for all SH-4 parts and clear it on the only SH-4 that doesn't
have one (SH4-501).
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This patch updates the PFC code with some clarifying
comments together with a functional change. The change
allows function type of GPIO to select any type of enum
in their MARK lists. Without this patch only function
type of enums are allowed in MARK lists.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The ioremap_fixed() stub neglected to provide a return value, resulting
in a fairly noisy build.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Implement .set_rate() for all SH "div4 clocks," .enable(), .disable(), and
.set_parent() for those, that support them. This allows, among other uses,
reparenting of SIU clocks to the external source, and enabling and
disabling of the IrDA clock on sh7722.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

These two got broken in the heartbeat private data conversion,
fix them up.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

urquell happens to use the same mode pins and EXTAL configuration as
SDK7786, so just copy it over.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This uses the mode pins exposed through the FPGA to work out whether
we're driven from EXTAL or not and does the appropriate setup and
propagation through the clock framework.

This will also -EINVAL out for anyone adding in their own oscillators,
forcing proper configuration with the clock framework instead of
proceeding on with bogus clock values.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This rewrites the SH7786 clock framework support completely. It's
reworked to provide all of the DIV4 and MSTP function clocks. This brings
it in line with the current clock framework code and lets us drop SH7786
from the list of CPUs that require legacy CPG handling.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The breakpoint handler was renamed on sh32, but sh64 was overlooked in
the conversion. Fix it up now.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This kills off the sh64-specific state restorer and switches over to
the generic one.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Presently the build bails with the following:

  CC      arch/sh/mm/alignment.o
cc1: warnings being treated as errors
arch/sh/mm/alignment.c: In function 'unaligned_fixups_notify':
arch/sh/mm/alignment.c:69: warning: cast to pointer from integer of different size
arch/sh/mm/alignment.c:74: warning: cast to pointer from integer of different size
make[2]: *** [arch/sh/mm/alignment.o] Error 1

This is due to the fact that regs->pc is always 64-bit, while the pointer size
depends on the ABI. Wrapping through instruction_pointer() takes care of the
appropriate casting for both configurations.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This updates the sh64 processor info with the sh32 changes in order to
tie in to the generic task_xstate management code.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The plans for _PAGE_WIRED were detailed in a comment with the fixmap
code, but as it's now all taken care of, we no longer have any reason for
keeping it around, particularly since it's no longer accurate. Kill it
off.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Presently this is duplicated between tlb-sh4 and tlb-pteaex. Split the
helpers out in to a generic tlb-urb that can be used by any parts
equipped with MMUCR.URB.

At the same time, move the SH-5 code out-of-line, as we require single
global state for DTLB entry wiring.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This provides a dummy value for legacy parts which permits the entry
wiring to be open-coded. The compiler takes care of optimizing the entry
wiring away in these cases.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Presently ioremap_prot() uses an unsigned long to pass the pgprot value
around. This results in the upper half of the pgprot being chomped when
using 64-bit pgprots on a 32-bit ABI (X2TLB and SH-5).

As the only users of ioremap_prot() are presently legacy parts, this
doesn't cause too much of an issue. In the future when the interface is
converted to use pgprot_t directly this can be re-enabled for the other
parts, too.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This kills off the ancient p3_ioremap(), converting over to the more
generic ioremap_prot() instead.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This is already taken care of in the top-level ioremap, and now that
no one should be calling ioremap_fixed() directly we can simply throw the
mapping displacement in as an additional argument.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Presently 'flags' gets passed around a lot between the various ioremap
helpers and implementations, which is only 32-bits. In the X2TLB case
we use 64-bit pgprots which presently results in the upper 32bits being
chopped off (which handily include our read/write/exec permissions).

As such, we convert everything internally to using pgprot_t directly and
simply convert over with pgprot_val() where needed. With this in place,
transparent fixmap utilization for early ioremap works as expected.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The mem_init_done test makes sure that this path is only entered in
__init cases, so leaving ioremap_fixed() as __init and flagging the
caller __init_refok is sufficient.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

iounmap() should balance whatever is done by ioremap(). Presently
ioremap() can do any of fixed mappings, PMB mappings, or page table
mappings. Presently only the latter two are handled through the standard
unmap path, so tie in the fixed unmapping, too.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This converts iounmap_fixed() to return success/error if it handled the
unmap request or not. At the same time, drop the __init label, as this
can be called in to later.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

There is nothing of interest in the _64 version anymore, so the _32 one
can be renamed and used unconditionally.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Presently the fixed ioremap API is only defined when CONFIG_IOREMAP_FIXED
is set. As we want to call in to it unconditionally, provide a stubbed
out interface.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>