diff options
| author | Wenyou Yang <wenyou.yang@atmel.com> | 2016-10-17 09:49:55 +0800 |
|---|---|---|
| committer | Andreas Bießmann <andreas@biessmann.org> | 2016-10-28 18:37:15 +0200 |
| commit | 998cf3c2becb933a87d001c24193911e64dc8b6a (patch) | |
| tree | 92ac79c427d420545cf731d77f122924092259c6 /drivers/serial | |
| parent | 6ec739aa525bb238acdd428042a11183ce4be3c4 (diff) | |
serial: atmel_usart: Support enable an early debug UART
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>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/serial/atmel_usart.c | 22 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 9e48902446..507a27da03 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. 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_NS16550 bool "ns16550" help diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c index e450135c75..7674f97e8d 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 |