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exynos: Add debug UART support for Samsung S5P serial

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Add a debug UART implementation for this serial driver. It does not set up
pinmux automatically - this must be done before calling debug_uart_init().

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-07-02 18:15:54 -06:00
parent 89ca9351cf
commit bf6e702232
2 changed files with 32 additions and 0 deletions
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7
drivers/serial/Kconfig
View File

@ -53,6 +53,13 @@ config DEBUG_EFI_CONSOLE
U-Boot when running on top of EFI (Extensive Firmware Interface).
This is a type of BIOS used by PCs.
config DEBUG_UART_S5P
bool "Samsung S5P"
help
Select this to enable a debug UART using the serial_s5p driver. You
will need to provide parameters to make this work. The driver will
be available until the real driver-model serial is running.
endchoice
config DEBUG_UART_BASE

25
drivers/serial/serial_s5p.c
View File

@ -200,3 +200,28 @@ U_BOOT_DRIVER(serial_s5p) = {
.ops = &s5p_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
#ifdef CONFIG_DEBUG_UART_S5P
#include <debug_uart.h>
void debug_uart_init(void)
{
struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
s5p_serial_init(uart);
s5p_serial_baud(uart, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
}
static inline void _debug_uart_putc(int ch)
{
struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
while (readl(&uart->ufstat) & TX_FIFO_FULL);
writeb(ch, &uart->utxh);
}
DEBUG_UART_FUNCS
#endif