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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
commit 235daa4bf6
16 changed files with 42 additions and 21 deletions
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2
src/drivers/uart/pl011.c
View file

@ -51,7 +51,7 @@ void uart_fill_lb(void *data)
struct lb_serial serial;
serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
serial.baud = CONFIG_TTYS0_BAUD;
serial.baud = get_uart_baudrate();
serial.regwidth = 1;
serial.input_hertz = uart_platform_refclk();
serial.uart_pci_addr = CONFIG_UART_PCI_ADDR;

4
src/drivers/uart/uart8250io.c
View file

@ -107,7 +107,7 @@ void uart_init(int idx)
{
if (!IS_ENABLED(CONFIG_DRIVERS_UART_8250IO_SKIP_INIT)) {
unsigned int div;
div = uart_baudrate_divisor(CONFIG_TTYS0_BAUD,
div = uart_baudrate_divisor(get_uart_baudrate(),
uart_platform_refclk(), uart_input_clock_divider());
uart8250_init(uart_platform_base(idx), div);
}
@ -134,7 +134,7 @@ void uart_fill_lb(void *data)
struct lb_serial serial;
serial.type = LB_SERIAL_TYPE_IO_MAPPED;
serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
serial.baud = CONFIG_TTYS0_BAUD;
serial.baud = get_uart_baudrate();
serial.regwidth = 1;
serial.input_hertz = uart_platform_refclk();
serial.uart_pci_addr = CONFIG_UART_PCI_ADDR;

4
src/drivers/uart/uart8250mem.c
View file

@ -119,7 +119,7 @@ void uart_init(int idx)
return;
unsigned int div;
div = uart_baudrate_divisor(CONFIG_TTYS0_BAUD,
div = uart_baudrate_divisor(get_uart_baudrate(),
uart_platform_refclk(), uart_input_clock_divider());
uart8250_mem_init(base, div);
}
@ -156,7 +156,7 @@ void uart_fill_lb(void *data)
serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
if (!serial.baseaddr)
return;
serial.baud = CONFIG_TTYS0_BAUD;
serial.baud = get_uart_baudrate();
if (IS_ENABLED(CONFIG_DRIVERS_UART_8250MEM_32))
serial.regwidth = sizeof(uint32_t);
else