Expressions involving "BIT(...)" create values of type "long", which is
64-bit on 64-bit.  Hence "~BIT(...)" no longer fits in 32-bit, which
will cause future compiler warnings when assigning to 32-bit variables:

    drivers/tty/serial/sh-sci.c: In function 'sci_init_single':
    drivers/tty/serial/sh-sci.h:58:25: warning: large integer implicitly truncated to unsigned type [-Woverflow]
     #define SCI_ERROR_CLEAR ~(SCI_RESERVED | SCI_PER | SCI_FER | SCI_ORER)
			     ^
    drivers/tty/serial/sh-sci.c:2325:27: note: in expansion of macro 'SCI_ERROR_CLEAR'
       sci_port->error_clear = SCI_ERROR_CLEAR;

As these values are (at most) 32-bit register values anyway, cast them
to "u32" at the definition level to prevent such compiler warnings.
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The #ifdef logic to clear SCxSR bits using RMW on SCIFA/SCIFB and SCIF
variants with some SCIFA features (sh7705/SH7720/sh7721) has several
drawbacks:
  - It wasn't updated for newer R-Mobile variants (APE6),
  - It doesn't correctly handle SoCs with both SCIF and SCIFA/B (e.g.
    R-Car Gen2, but also legacy sh7723/sh7724),
  - It doesn't play well with ARM multi-platform kernels: on R-Car Gen2,
    SCIF/SCIFA/SCIFB/HSCIF were handled differently, depending on
    whether r8a7740 or sh73a0 support was enabled or not,

Replace the #ifdef logic by runtime logic to fix this.

SCIFA/SCIFB and SCIF on sh7705/sh7720/sh7721 use RMW to clear error
bits, other variants use plain stores, as before.

Note that this changes behavior for SCIFA on sh7723/sh7724 (these SoCs
have both SCIF and SCIFA), which didn't use RMW before.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add the missing overrun bit definition for (H)SCIF.
Replace overrun_bit by overrun_mask, so we can use the existing
defines instead of hardcoded values.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add the missing overrun error bit in SCxSR on SCIFA/SCIFB and SCIF on
SH7705/SH7720/SH7721.
Document what the corresponding bit(s) on plain SCIF are used for.
Sort the components of SCIF_DEFAULT_ERROR_MASK by reverse definition
order.

Replace the hardcoded values in the SCxSR_*_CLEAR macros by proper
defines. Use bit masks (negations of sets of bits) to make it more
obvious which bits are being cleared.

Assembler output (on sh) was compared before and after this commit:
  - For the first branch of the big "#if defined(...) || ..." construct,
    the code has changed slightly, as 32-bit bitmasks can be loaded in a
    single instruction, unlike the old large 16-bit constants (the SCxSR
    register is 16 bit, so we don't care about the top 16 bits),
  - For the second branch, the generated code is identical.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add the register definitions for the Serial Port Control and Data
Registers on SCIFA/SCIFB, which are needed for RTS/CTS pin control.

Extracted from patches by Magnus Damm <damm+renesas@opensource.se>.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add the missing register bit definitions to set the RTS pin and read the
CTS pin on (H)SCIF.

Extracted from patches by Magnus Damm <damm+renesas@opensource.se>.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Move private register definitions and enums from the public
<linux/serial_sci.h> header file to the driver private "sh-sci.h" header
file.

The common Serial Control Register definitions are left in the public
header file, as they're needed to fill in plat_sci_port.scscr on legacy
systems not using DT.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The Kconfig option ARCH_SH7372 has been removed by commit 59b89af1
("ARM: shmobile: sh7372: Remove Legacy C SoC code").  This patch removes
the last reference on this Kconfig option.
Signed-off-by: NValentin Rothberg <valentinrothberg@gmail.com>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

None of the fields is ever set by board code, and both of them are set
in the driver at probe time. Move them out of struct plat_sci_port to
struct sci_port.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

Support for SH7367 and SH7377 got removed in v3.8. Now remove their
last Kconfig macros.
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Follows the 8250 change for pretty much the same rationale.

See commit "serial: use serial_port_in/out vs serial_in/out in 8250".
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This adds preliminary support for the R8A7740 (R-Mobile A1) CPU

Timer, serial, gic, clock are supported at this point.
This patch is based on v0.1 manual
Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This consolidates all of the TX/RX fill/room nonsense in to a single set
of fairly heavyweight definitions. The implementation goes in descending
order of complexity, testing the register map for capabilities until we
run out of options and do it the legacy SCI way. Masks are derived
directly from the per-port FIFO size, meaning that platforms with FIFO
sizes not matching the standard port types will still need to manually
fix them up.

This also fixes up a number of issues such as tx_empty being completely
bogus for SCI and IrDA ports, some ports using masks smaller or greater
than their FIFO size, and so forth.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This takes a bit of a sledgehammer to the horribly CPU subtype
ifdef-ridden header and abstracts all of the different register layouts
in to distinct types which in turn can be overriden on a per-port basis,
or permitted to default to the map matching the port type at probe time.

In the process this ultimately fixes up inumerable bugs with mismatches
on various CPU types (particularly the legacy ones that were obviously
broken years ago and no one noticed) and provides a more tightly coupled
and consolidated platform for extending and implementing generic
features.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Non-SCI parts do not have the special port reg necessary for cases where
the RX and SCI pins are muxed and need to be manually polled, so these
like always fall back on the normal FIFO processing paths. SH7760 is in a
class in and of itself with regards to mapping its SIM card interface via
the SCI port class despite not having any of the RXD lines wired up and
so implicitly behaving more like a SCIF in this regard. Out of the other
CPUs, some support the port check via the same block while others do it
through an external SuperI/O, so it's not even possible to perform the
check relative to the ioremapped cookie offset, so the separate read
semantics are preserved here, too.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This consolidates all of the broken out overrun handling and ensures that
we have sensible defaults per-port type, in addition to making sure that
overruns are flagged appropriately in the error mask for parts that
haven't explicitly disabled support for it.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

h8300 has never been updated upstream to support the conversion to the
driver model (which happened mid-2.5), and it doesn't seem likely that it
ever will. Kill off the remaining bitrotted support to reduce the
maintenance burden going forward.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Fix sh7377 and sh73a0 build failure:

drivers/tty/serial/sh-sci.c: In function 'scif_txfill':
drivers/tty/serial/sh-sci.c:338: error: implicit declaration of function 'sci_SCTFDR_in'
drivers/tty/serial/sh-sci.c: In function 'scif_rxfill':
drivers/tty/serial/sh-sci.c:351: error: implicit declaration of function 'sci_SCRFDR_in'
make[3]: *** [drivers/tty/serial/sh-sci.o] Error 1
make[2]: *** [drivers/tty/serial] Error 2
make[1]: *** [drivers/tty] Error 2
make: *** [drivers] Error 2
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The serial drivers are really just tty drivers, so move them to
drivers/tty/ to make things a bit neater overall.

This is part of the tty/serial driver movement proceedure as proposed by
Arnd Bergmann and approved by everyone involved a number of months ago.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl>
Cc: Michael H. Warfield <mhw@wittsend.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch adds initial support for Renesas SH-Mobile AG5.

At this point the AG5 CPU support is limited to the ARM
core, SCIF serial and a CMT timer together with L2 cache
and the GIC. The AG5EVM board also supports Ethernet.

Future patches will add support for GPIO, INTCS, CPGA
and platform data / driver updates for devices such as
IIC, LCDC, FSI, KEYSC, CEU and SDHI among others.

The code in entry-macro.S will be cleaned up when the
ARM IRQ demux code improvements have been merged.

Depends on the AG5EVM mach-type recently registered but
not yet present in arch/arm/tools/mach-types.

As the AG5EVM board comes with 512MiB memory it is
recommended to turn on HIGHMEM.

Many thanks to Yoshii-san for initial bring up.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This patch series adds support for ITO Co., Ltd.'s SH-2007 reference
platform (A PC-104 based SH7780 platform).

This is a direct port of the out-of-tree board support from the vendor's
kernel, originally located at:

	http://ms-n.org/sh-linux/kernel/

More information on the board and the vendor can be obtained from the
vendor's site at:

	http://www.itonet.co.jp/

Presently supported peripherals are CF and ethernet, with support for
the on-board IDE still pending further testing.
Reviewed-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>
Reviewed-by: NMagnus Damm <magnus.damm@gmail.com>
Signed-off-by: NHitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

SCIFB ports have a slightly different register layout and a different FIFO
size from SCIFA ports, in DMA mode they have to be treated just like SCIFA.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The follwing commit breaks SH-Mobile on non-ARM platforms:
"8a77b8d0 serial: sh-sci: Support ARM-based SH-Mobile CPUs."

The commit assumed that CONFIG_ARCH_SHMOBILE only was set
on ARM platforms, but it turns out that this kconfig is also
set by all SH-based SoCs. Sh7724 and other older SH-Mobile
SoCs are all broken without this fix.

This patch converts the "defined(CONFIG_ARCH_SHMOBILE)" into
one "defined()" per SoC model - similar to existing SH code.
Reported-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Add support for ARM-based SH-Mobile CPUs to the sh-sci driver.

Also remove the SCLSR register that is missing on sh772x, sh7705 and
SH-Mobile.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Since sci_rxd_in() is used by SCI only, clean up
the header file by killing off code dealing with
SCIF ports and their register definitions.

Also introduce a default sci_rxd_in() function
which can be shared by all SCIF-only processors.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

ctrl_xxx() is an antiquated SH interface, while __raw_xxx is the standard
API that accomplishes the same thing. As such, this converts the
remaining sh-sci straggles over, which enables the driver to be wired up
for ARM SH-Mobile CPUs as well.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The sh-sci code conditionalized the clock framework support in order to
give the other platforms a chance to catch up. sh64 supported this some
time ago and the forthcoming ARM changes handle this as well, this leaves
h8300 as the odd one out. H8300 has had since 2.5 to merge it's sh-sci
support upstream, and has yet to do so. At this point I will no longer be
holding back the driver to support an unreponsive architecture, 7 years
is quite enough of a grace period. Support is easily implemented on the
architecture if and when it ever decides to merge its changes upstream.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Signed-off-by: NYoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Many of these flags were duplicated, and as we now need this visibility
to set them from the platform code, we can just use the linux/serial_sci.h
variants instead.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Several of these registers are defined but never used, kill them off in
the interest of increased sanity.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This permits each port to select its own SCBRR calculation algorithm,
rather than having it all ifdef'ed in the header. There are presently
only 5 different variations that all parts fall under.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This moves all of the SCSCR_INIT definitions in to the platform data,
for future consolidation.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

sci_rxd_in() on SH-5 wants to be using SCSPTR, not SCSPTR2.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>