[U-Boot] [PATCH v3 2/3] serial: uartlite: Add support for debug console

[Michal Simek]

Add support for debug console.

Signed-off-by: Michal Simek <michal.si...@xilinx.com>
Reviewed-by: Thomas Chou <tho...@wytron.com.tw>
---

Changes in v3:
- Add static inline to _debug_uart_init

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 157e14dedc4f..a2e930392571 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>
+
+static inline 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
-- 
1.9.1

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