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serial: mxc: Add debug uart support

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Add support for the debug UART to assist with early debugging.
Enable it for i.CoreM6 as an example.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jagan Teki 2017-06-06 05:31:51 +00:00 committed by Stefano Babic
parent 52c14cabda
commit 61366b71a8
3 changed files with 38 additions and 0 deletions
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4
configs/imx6qdl_icore_mmc_defconfig
View file

@ -45,3 +45,7 @@ CONFIG_PINCTRL_IMX6=y
CONFIG_MXC_UART=y
CONFIG_IMX_THERMAL=y
CONFIG_VIDEO_IPUV3=y
CONFIG_DEBUG_UART=y
CONFIG_DEBUG_UART_MXC=y
CONFIG_DEBUG_UART_BASE=0x021f0000
CONFIG_DEBUG_UART_CLOCK=24000000

8
drivers/serial/Kconfig
View file

@ -248,6 +248,14 @@ config DEBUG_UART_PIC32
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_MXC
bool "IMX Serial port"
depends on MXC_UART
help
Select this to enable a debug UART using the serial_mxc 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_UNIPHIER
bool "UniPhier on-chip UART"
depends on ARCH_UNIPHIER

26
drivers/serial/serial_mxc.c
View file

@ -357,3 +357,29 @@ U_BOOT_DRIVER(serial_mxc) = {
.flags = DM_FLAG_PRE_RELOC,
};
#endif
#ifdef CONFIG_DEBUG_UART_MXC
#include <debug_uart.h>
static inline void _debug_uart_init(void)
{
struct mxc_uart *base = (struct mxc_uart *)CONFIG_DEBUG_UART_BASE;
_mxc_serial_init(base);
_mxc_serial_setbrg(base, CONFIG_DEBUG_UART_CLOCK,
CONFIG_BAUDRATE, false);
}
static inline void _debug_uart_putc(int ch)
{
struct mxc_uart *base = (struct mxc_uart *)CONFIG_DEBUG_UART_BASE;
while (!(readl(&base->ts) & UTS_TXEMPTY))
WATCHDOG_RESET();
writel(ch, &base->txd);
}
DEBUG_UART_FUNCS
#endif