+static DEFINE_MUTEX(serial_txx9_mutex);
+
+/**
+ * serial_txx9_register_port - register a serial port
+ * @port: serial port template
+ *
+ * Configure the serial port specified by the request.
+ *
+ * The port is then probed and if necessary the IRQ is autodetected
+ * If this fails an error is returned.
+ *
+ * On success the port is ready to use and the line number is returned.
+ */
+static int __devinit serial_txx9_register_port(struct uart_port *port)
+{
+ int i;
+ struct uart_txx9_port *uart;
+ int ret = -ENOSPC;
+
+ mutex_lock(&serial_txx9_mutex);
+ for (i = 0; i < UART_NR; i++) {
+ uart = &serial_txx9_ports[i];
+ if (!(uart->port.iobase || uart->port.mapbase))
+ break;
+ }
+ if (i < UART_NR) {
+ uart->port.iobase = port->iobase;
+ uart->port.membase = port->membase;
+ uart->port.irq = port->irq;
+ uart->port.uartclk = port->uartclk;
+ uart->port.iotype = port->iotype;
+ uart->port.flags = port->flags | UPF_BOOT_AUTOCONF;
+ uart->port.mapbase = port->mapbase;
+ if (port->dev)
+ uart->port.dev = port->dev;
+ ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
+ if (ret == 0)
+ ret = uart->port.line;
+ }
+ mutex_unlock(&serial_txx9_mutex);
+ return ret;
+}
+
+/**
+ * serial_txx9_unregister_port - remove a txx9 serial port at runtime
+ * @line: serial line number
+ *
+ * Remove one serial port. This may not be called from interrupt
+ * context. We hand the port back to the our control.
+ */
+static void __devexit serial_txx9_unregister_port(int line)
+{
+ struct uart_txx9_port *uart = &serial_txx9_ports[line];
+
+ mutex_lock(&serial_txx9_mutex);
+ uart_remove_one_port(&serial_txx9_reg, &uart->port);
+ uart->port.flags = 0;
+ uart->port.type = PORT_UNKNOWN;
+ uart->port.iobase = 0;
+ uart->port.mapbase = 0;
+ uart->port.membase = NULL;
+ uart->port.dev = NULL;
+ mutex_unlock(&serial_txx9_mutex);
+}
+