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driver/uart: Introduce a way for mainboard to override the baudrate

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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>
This commit is contained in:
Julien Viard de Galbert
2018-02-20 11:45:48 +01:00
committed by Martin Roth
parent fa650f5e8c
commit 235daa4bf6
16 changed files with 42 additions and 21 deletions
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11
src/include/console/uart.h
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@ -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