console: Implement flush() function

On certain places it is required to flush output print buffers to ensure
that text strings were sent to console or serial devices. For example when
printing message that U-Boot is going to boot kernel or when U-Boot is
going to change baudrate of terminal device.

Therefore introduce a new flush() and fflush() functions into console code.
These functions will call .flush callback of associated stdio_dev device.

As this function may increase U-Boot side, allow to compile U-Boot without
this function. For this purpose there is a new config CONSOLE_FLUSH_SUPPORT
which is enabled by default and can be disabled. It is a good idea to have
this option enabled for all boards which have enough space for it.

When option is disabled when U-Boot defines just empty static inline
function fflush() to avoid ifdefs in other code.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

serial: Rename SERIAL_SUPPORT to SERIAL

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>

common: rename getc() to getchar()

The sandbox is built with the SDL2 library with invokes the X11 library
which in turn calls getc(). But getc() in glibc is defined as

int getc(FILE *)

This does not match our definition.

int getc(void)

The sandbox crashes when called with parameter -l.

Rename our library symbol getc() to getchar().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

stdio.h: move printf() stuff from <common.h> to <stdio.h>

<common.h> pulls in a lot of headers. Including it from every .c
file is a bad idea. We need to remove contents until it contains
nothing.

Move printf() and friends to <stdio.h>.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

serial: Rename SERIAL_SUPPORT to SERIAL

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>

common: rename getc() to getchar()

The sandbox is built with the SDL2 library with invokes the X11 library
which in turn calls getc(). But getc() in glibc is defined as

int getc(FILE *)

This does not match our definition.

int getc(void)

The sandbox crashes when called with parameter -l.

Rename our library symbol getc() to getchar().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

stdio.h: move printf() stuff from <common.h> to <stdio.h>

<common.h> pulls in a lot of headers. Including it from every .c
file is a bad idea. We need to remove contents until it contains
nothing.

Move printf() and friends to <stdio.h>.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

common: rename getc() to getchar()

The sandbox is built with the SDL2 library with invokes the X11 library
which in turn calls getc(). But getc() in glibc is defined as

int getc(FILE *)

This does not match our definition.

int getc(void)

The sandbox crashes when called with parameter -l.

Rename our library symbol getc() to getchar().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

stdio.h: move printf() stuff from <common.h> to <stdio.h>

<common.h> pulls in a lot of headers. Including it from every .c
file is a bad idea. We need to remove contents until it contains
nothing.

Move printf() and friends to <stdio.h>.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

stdio.h: move printf() stuff from <common.h> to <stdio.h>

<common.h> pulls in a lot of headers. Including it from every .c
file is a bad idea. We need to remove contents until it contains
nothing.

Move printf() and friends to <stdio.h>.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>