On Tue, Sep 13, 2016 at 10:37:33AM +0800, Wenyou Yang wrote:
Add support to enable an early debug UART for debugging.
Signed-off-by: Wenyou Yang wenyou.yang@atmel.com Reviewed-by: Simon Glass sjg@chromium.org
Reviewed-by: Andreas Bießmann andreas@biessmann.org
Changes in v2:
- Collect the Reviewed-by tag.
drivers/serial/Kconfig | 7 +++++++ drivers/serial/atmel_usart.c | 22 ++++++++++++++++++++++ 2 files changed, 29 insertions(+)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index a6035dc..b8ecd80 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -98,6 +98,13 @@ config DEBUG_UART_AR933X driver will be available until the real driver model serial is running.
+config DEBUG_UART_ATMEL
- bool "Atmel USART"
- help
Select this to enable a debug UART using the atmel usart driver. Youwill need to provide parameters to make this work. The driver willbe available until the real driver-model serial is running.config DEBUG_UART_NS16550 bool "ns16550" help diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c index e450135..7674f97 100644 --- a/drivers/serial/atmel_usart.c +++ b/drivers/serial/atmel_usart.c @@ -11,6 +11,7 @@ #include <errno.h> #include <watchdog.h> #include <serial.h> +#include <debug_uart.h> #include <linux/compiler.h>
#include <asm/io.h> @@ -226,3 +227,24 @@ U_BOOT_DRIVER(serial_atmel) = { .priv_auto_alloc_size = sizeof(struct atmel_serial_priv), }; #endif
+#ifdef CONFIG_DEBUG_UART_ATMEL +static inline void _debug_uart_init(void) +{
- atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_DEBUG_UART_BASE;
- atmel_serial_setbrg_internal(usart, 0, CONFIG_BAUDRATE);
+}
+static inline void _debug_uart_putc(int ch) +{
- atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_DEBUG_UART_BASE;
- while (!(readl(&usart->csr) & USART3_BIT(TXRDY)))
;- writel(ch, &usart->thr);
+}
+DEBUG_UART_FUNCS +#endif