commit 68cb4f8e246bbbc649980be0628cae9265870a91 upstream.

Do not read IIR in serial8250_start_tx when UART_BUG_TXEN

Reading the IIR clears some oustanding interrupts so it is not safe.
Instead, simply transmit immediately if the buffer is empty without
regard to IIR.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Many boards have a bug-free ns16550 compatible serial port, which we should
register as PORT_16550A. This introduces a new value "ns16550a" for the
compatible property of of_serial to let a firmware choose that model instead
of using the crippled PORT_16550 mode.

Reported-by: Alon Ziv <alonz@nolaviz.org>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

The driver missed a small API change while sitting in Ralf's tree, this
patch makes it compile again.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sunsu: Use sunserial_console_termios() in sunsu_console_setup().
  sunsu: Pass true 'ignore_line' to console match when RSC or LOM console.
  serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().
  serial: suncore: Add 'ignore_line' argument to sunserial_console_match().
  sunsu: Fix detection of SU ports which are RSC console or control.
  sunsab: Do not set sunsab_reg.cons right before registering minors.
  sparc64: Fix definition of VMEMMAP_SIZE.

Be like the other Sun serial drivers otherwise the special handling of
OpenFirmware options and hard-coded overrides for LOM/RSC consoles
will not be handled.

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>

RSC and LOM devices have fixed speed settings.

We already had some code to match and handle "rsc" named devices on
E250 systems, but we also have to handle 'rsc-console', 'rsc-control',
and 'lom-console'.

Also, in order to get this right regardless of what 'output-device'
happens to be, explicitly pass the UART device node pointer to this
routine.

Signed-off-by: David S. Miller <davem@davemloft.net>

This tells the logic to ignore the line match when deciding whether the
device is the OpenFirmware specified console device or not.

This is going to be used in the SU driver for rsc-console detection.

There is probably a better way to handle this, but this is the least
intrusive solution for now which we can validate won't break any other
cases.

Signed-off-by: David S. Miller <davem@davemloft.net>

These device nodes are named "rsc-console" and "rsc-control" rather
than 'serial', but the device_type property is 'serial' so we'll
tip off of that for detection.

Signed-off-by: David S. Miller <davem@davemloft.net>

Other Sun serial drivers do not do this, and if we keep it this way
it ends up registering all serial devices as consoles rather than
just the one which we explicitly register via sunserial_console_match()
which uses add_preferred_console().

Signed-off-by: David S. Miller <davem@davemloft.net>