static const char serial21285_name[] = "Footbridge UART";
-#define tx_enabled(port) ((port)->unused[0])
-#define rx_enabled(port) ((port)->unused[1])
+/*
+ * We only need 2 bits of data, so instead of creating a whole structure for
+ * this, use bits of the private_data pointer of the uart port structure.
+ */
+#define tx_enabled_bit 0
+#define rx_enabled_bit 1
+
+static bool is_enabled(struct uart_port *port, int bit)
+{
+ unsigned long private_data = (unsigned long)port->private_data;
+
+ if (test_bit(bit, &private_data))
+ return true;
+ return false;
+}
+
+static void enable(struct uart_port *port, int bit)
+{
+ unsigned long private_data = (unsigned long)port->private_data;
+
+ set_bit(bit, &private_data);
+}
+
+static void disable(struct uart_port *port, int bit)
+{
+ unsigned long private_data = (unsigned long)port->private_data;
+
+ clear_bit(bit, &private_data);
+}
+
+#define is_tx_enabled(port) is_enabled(port, tx_enabled_bit)
+#define tx_enable(port) enable(port, tx_enabled_bit)
+#define tx_disable(port) disable(port, tx_enabled_bit)
+
+#define is_rx_enabled(port) is_enabled(port, rx_enabled_bit)
+#define rx_enable(port) enable(port, rx_enabled_bit)
+#define rx_disable(port) disable(port, rx_enabled_bit)
/*
* The documented expression for selecting the divisor is:
static void serial21285_stop_tx(struct uart_port *port)
{
- if (tx_enabled(port)) {
+ if (is_tx_enabled(port)) {
disable_irq_nosync(IRQ_CONTX);
- tx_enabled(port) = 0;
+ tx_disable(port);
}
}
static void serial21285_start_tx(struct uart_port *port)
{
- if (!tx_enabled(port)) {
+ if (!is_tx_enabled(port)) {
enable_irq(IRQ_CONTX);
- tx_enabled(port) = 1;
+ tx_enable(port);
}
}
static void serial21285_stop_rx(struct uart_port *port)
{
- if (rx_enabled(port)) {
+ if (is_rx_enabled(port)) {
disable_irq_nosync(IRQ_CONRX);
- rx_enabled(port) = 0;
+ rx_disable(port);
}
}
{
int ret;
- tx_enabled(port) = 1;
- rx_enabled(port) = 1;
+ tx_enable(port);
+ rx_enable(port);
ret = request_irq(IRQ_CONRX, serial21285_rx_chars, 0,
serial21285_name, port);