[U-Boot] [PATCH 2/3] serial: uartlite: Add support for debug console

[Thomas Chou]

Hi Michal,

On 2015年12月11日 19:54, Michal Simek wrote:
> Signed-off-by: Michal Simek <michal.simek at xilinx.com>
> ---
>
>   drivers/serial/Kconfig            |  7 +++++++
>   drivers/serial/serial_xuartlite.c | 23 +++++++++++++++++++++++
>   2 files changed, 30 insertions(+)
>
> diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
> index 1fc287ee98ec..f1e221799b81 100644
> --- a/drivers/serial/Kconfig
> +++ b/drivers/serial/Kconfig
> @@ -92,6 +92,13 @@ config DEBUG_UART_S5P
>   	  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_UARTLITE
> +	bool "Xilinx Uartlite"
> +	help
> +	  Select this to enable a debug UART using the serial_uartlite 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_ZYNQ
>   	bool "Xilinx Zynq"
>   	help
> diff --git a/drivers/serial/serial_xuartlite.c b/drivers/serial/serial_xuartlite.c
> index 10089f5a34b5..fe87b515d902 100644
> --- a/drivers/serial/serial_xuartlite.c
> +++ b/drivers/serial/serial_xuartlite.c
> @@ -120,3 +120,26 @@ U_BOOT_DRIVER(serial_uartlite) = {
>   	.ops	= &uartlite_serial_ops,
>   	.flags = DM_FLAG_PRE_RELOC,
>   };
> +
> +#ifdef CONFIG_DEBUG_UART_UARTLITE

Better move the "#include <debug_uart.h>" here.

> +void _debug_uart_init(void)

Please add "static inline" to void _debug_uart_init(void).

> +{
> +	struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
> +
> +	out_be32(&regs->control, 0);
> +	out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
> +	in_be32(&regs->control);
> +}
> +
> +static inline void _debug_uart_putc(int ch)
> +{
> +	struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
> +
> +	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
> +		WATCHDOG_RESET();

WATCHDOG_RESET() is not really needed for debug serial output.

> +
> +	out_be32(&regs->tx_fifo, ch & 0xff);
> +}
> +
> +DEBUG_UART_FUNCS
> +#endif
>

Best regards,
Thomas