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authorJulien Viard de Galbert <jviarddegalbert@online.net>2018-02-20 11:45:48 +0100
committerMartin Roth <martinroth@google.com>2018-02-21 16:09:06 +0000
commit235daa4bf6b6467b5df675dcfe5041b7f62eeae3 (patch)
tree074bc4b58e2da4c7f6fb43c5e7613b08861d5d33 /src/include/console/uart.h
parentfa650f5e8c7cd81138b60d09d4a41b5454f03cc1 (diff)
downloadcoreboot-235daa4bf6b6467b5df675dcfe5041b7f62eeae3.tar.xz
driver/uart: Introduce a way for mainboard to override the baudrate
The rationale is to allow the mainboard to override the default baudrate for instance by sampling GPIOs at boot. A new configuration option is available for mainboards to select this behaviour. It will then have to define the function get_uart_baudrate to return the computed baudrate. Change-Id: I970ee788bf90b9e1a8c6ccdc5eee8029d9af0ecc Signed-off-by: Julien Viard de Galbert <jviarddegalbert@online.net> Reviewed-on: https://review.coreboot.org/23713 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/include/console/uart.h')
-rw-r--r--src/include/console/uart.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/include/console/uart.h b/src/include/console/uart.h
index 0dccd00d43..3bd390e75b 100644
--- a/src/include/console/uart.h
+++ b/src/include/console/uart.h
@@ -23,6 +23,17 @@
* baudrate generator. */
unsigned int uart_platform_refclk(void);
+#if IS_ENABLED(CONFIG_UART_OVERRIDE_BAUDRATE)
+/* Return the baudrate, define this in your platform when using the above
+ configuration. */
+unsigned int get_uart_baudrate(void);
+#else
+static inline unsigned int get_uart_baudrate(void)
+{
+ return CONFIG_TTYS0_BAUD;
+}
+#endif
+
/* Returns the divisor value for a given baudrate.
* The formula to satisfy is:
* refclk / divisor = baudrate * oversample