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serial/serial_arc: Implement debug serial

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Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Alexey Brodkin 2018-05-21 16:42:07 +03:00
parent d7ac185fd8
commit 54705016ba
2 changed files with 35 additions and 0 deletions
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9
drivers/serial/Kconfig
View File

@ -197,6 +197,15 @@ config DEBUG_UART_AR933X
driver will be available until the real driver model serial is
running.
config DEBUG_ARC_SERIAL
bool "ARC UART"
depends on ARC_SERIAL
help
Select this to enable a debug UART using the ARC UART driver.
You will need to provide parameters to make this work. The
driver will be available until the real driver model serial is
running.
config DEBUG_UART_ATMEL
bool "Atmel USART"
help

26
drivers/serial/serial_arc.c
View File

@ -130,3 +130,29 @@ U_BOOT_DRIVER(serial_arc) = {
.ops = &arc_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
#ifdef CONFIG_DEBUG_ARC_SERIAL
#include <debug_uart.h>
static inline void _debug_uart_init(void)
{
struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
int arc_console_baud = CONFIG_DEBUG_UART_CLOCK / (CONFIG_BAUDRATE * 4) - 1;
writeb(arc_console_baud & 0xff, &regs->baudl);
writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
}
static inline void _debug_uart_putc(int c)
{
struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
while (!(readb(&regs->status) & UART_TXEMPTY))
;
writeb(c, &regs->data);
}
DEBUG_UART_FUNCS
#endif