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

Michal Simek
2015-12-11T11:54:14Z

Signed-off-by: Michal Simek <michal.simek@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
+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();
+
+ out_be32(&regs->tx_fifo, ch & 0xff);
+}
+
+DEBUG_UART_FUNCS
+#endif
--
1.9.1