dev/serial: Simplify some Zynq UART functions

Make the initialization and polled functions independent of the Termios
context.  This helps to implement the kernel I/O support without a dependency
on the Termios framework.

bsps/include/dev/serial/zynq-uart-regs.h

@@ -43,6 +43,8 @@
 
 #include <bsp/utility.h>
 
+#define ZYNQ_UART_DEFAULT_BAUD 115200
+
 #define ZYNQ_UART_FIFO_DEPTH 64
 
 typedef struct zynq_uart {
@@ -158,6 +160,24 @@ typedef struct zynq_uart {
 #define ZYNQ_UART_TX_FIFO_TRG_LVL_TTRIG_SET(reg, val) BSP_FLD32SET(reg, val, 0, 5)
 } zynq_uart;
 
+void zynq_uart_initialize(volatile zynq_uart *regs);
+
+int zynq_uart_read_char_polled(volatile zynq_uart *regs);
+
+void zynq_uart_write_char_polled(volatile zynq_uart *regs, char c);
+
+/**
+  * Flush TX FIFO and wait until it is empty. Used in bsp_reset.
+  */
+void zynq_uart_reset_tx_flush(volatile zynq_uart *regs);
+
+int zynq_cal_baud_rate(
+  uint32_t  baudrate,
+  uint32_t* brgr,
+  uint32_t* bauddiv,
+  uint32_t  modereg
+);
+
 /** @} */
 
 #endif /* LIBBSP_ARM_XILINX_ZYNQ_UART_REGS_H */

bsps/include/dev/serial/zynq-uart.h

@@ -59,29 +59,6 @@ typedef struct {
 
 extern const rtems_termios_device_handler zynq_uart_handler;
 
-#define ZYNQ_UART_DEFAULT_BAUD 115200
-
-void zynq_uart_initialize(rtems_termios_device_context *base);
-
-int zynq_uart_read_polled(rtems_termios_device_context *base);
-
-void zynq_uart_write_polled(
-  rtems_termios_device_context *base,
-  char c
-);
-
-/**
-  * Flush TX FIFO and wait until it is empty. Used in bsp_reset.
-  */
-void zynq_uart_reset_tx_flush(zynq_uart_context *ctx);
-
-int zynq_cal_baud_rate(
-  uint32_t  baudrate,
-  uint32_t* brgr,
-  uint32_t* bauddiv,
-  uint32_t  modereg
-);
-
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */