[U-Boot] [PATCH v2 2/3] serial: uartlite: Add support for debug console

Add support for debug console.

Signed-off-by: Michal Simek michal.simek@xilinx.com ---

Changes in v2: - Add needed header from the first patch - Remove WATCHDOG_RESET call - Extend commit description

drivers/serial/Kconfig | 7 +++++++ drivers/serial/serial_xuartlite.c | 26 ++++++++++++++++++++++++++ 2 files changed, 33 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 8225d9a320a5..f42b11eae102 100644 --- a/drivers/serial/serial_xuartlite.c +++ b/drivers/serial/serial_xuartlite.c @@ -114,3 +114,29 @@ U_BOOT_DRIVER(serial_uartlite) = { .ops = &uartlite_serial_ops, .flags = DM_FLAG_PRE_RELOC, }; + +#ifdef CONFIG_DEBUG_UART_UARTLITE + +#include <debug_uart.h> + +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) + ; + + out_be32(&regs->tx_fifo, ch & 0xff); +} + +DEBUG_UART_FUNCS +#endif