console: Make locally used function static ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common: console_console: put functions under correct ifdef ...

So they aren't build when no console support is selected.

Fixes:
In function `console_get_by_dev': undefined reference to `console_list'

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Make sure xzalloc is only used when it's available ...

To make it possible to call the pr_* functions very early before
malloc is initialized test if malloc is available before using
it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Introduce message logging support ...

This adds a buffer for log messages and a 'dmesg' command to
print the messages. The log buffer is implemented as log objects
rather than a string buffer. This makes it easy to implement
limiting the messages, cleaning the buffer and timestamping
the messages.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/rs485' ...

Conflicts:
	common/console_common.c

Merge branch 'for-next/login' ...

Conflicts:
	include/console.h

console: factorise function to get the first enabled console ...

rename it to console_get_first_active

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

introduce runtime loglevel ...

With this the verbosity of barebox can be controlled during runtime
using the 'loglevel' globalvar.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: introduce console_get_by_dev ...

so we can get console by it's device

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

login: disable input console if password wrong ...

so we guarantee that barebox is secured again user interaction

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: consolidate common console code ...

The different console implementations share a good amount of code,
share this in console_common.c.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>