console: Introduce a way for mainboard to override the loglevel

This change adds a config option to allow mainboard to override
the console loglevel. When the option is set, the platform has
to define the function get_console_loglevel returning a valid
loglevel value.

This allows a mainboard to sample a GPIO to switch the loglevel
value between different environments (qualification vs production)
without re-flashing.

Change-Id: Id6cc72b8fe5c4c50a6f83ce80e6440b078eec6e2
Signed-off-by: Julien Viard de Galbert <jviarddegalbert@online.net>
Reviewed-on: https://review.coreboot.org/23712
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/include/console/console.h b/src/include/console/console.h
index aa935e4579..1ecf89c288 100644
--- a/src/include/console/console.h
+++ b/src/include/console/console.h
@@ -64,6 +64,18 @@ void do_putchar(unsigned char byte);
 #define printk(LEVEL, fmt, args...) \
 	do { do_printk(LEVEL, fmt, ##args); } while (0)
 
+#if IS_ENABLED(CONFIG_CONSOLE_OVERRIDE_LOGLEVEL)
+/*
+ * This function should be implemented at mainboard level.
+ * The returned value will _replace_ the loglevel value;
+ */
+int get_console_loglevel(void);
+#else
+static inline int get_console_loglevel(void)
+{
+	return CONFIG_DEFAULT_CONSOLE_LOGLEVEL;
+}
+#endif
 #else
 static inline void console_init(void) {}
 static inline int console_log_level(int msg_level) { return 0; }