drivers: tty: serial: uartlite: fill mapsize and use it

Fill the struct uart_port->mapsize field and use it, insteaf of
hardcoded values in many places. This makes the code layout a bit
more consistent and easily allows using generic helpers for the
io memory handling.

Candidates for such helpers could be eg. the request+ioremap and
iounmap+release combinations.

Signed-off-by: Enrico Weigelt <info@metux.net>

drivers/tty/serial/uartlite.c

@@ -342,7 +342,7 @@ static const char *ulite_type(struct uart_port *port)
 
 static void ulite_release_port(struct uart_port *port)
 {
-	release_mem_region(port->mapbase, ULITE_REGION);
+	release_mem_region(port->mapbase, port->mapsize);
 	iounmap(port->membase);
 	port->membase = NULL;
 }
@@ -356,15 +356,15 @@ static int ulite_request_port(struct uart_port *port)
 		"ulite console: port=%p; port->mapbase=%llx\n",
 		 port, (unsigned long long) port->mapbase);
 
-	if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
+	if (!request_mem_region(port->mapbase, port->mapsize, "uartlite")) {
 		dev_err(port->dev, "Memory region busy\n");
 		return -EBUSY;
 	}
 
-	port->membase = ioremap(port->mapbase, ULITE_REGION);
+	port->membase = ioremap(port->mapbase, port->mapsize);
 	if (!port->membase) {
 		dev_err(port->dev, "Unable to map registers\n");
-		release_mem_region(port->mapbase, ULITE_REGION);
+		release_mem_region(port->mapbase, port->mapsize);
 		return -EBUSY;
 	}
 
@@ -649,6 +649,7 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq,
 	port->iotype = UPIO_MEM;
 	port->iobase = 1; /* mark port in use */
 	port->mapbase = base;
+	port->mapsize = ULITE_REGION;
 	port->membase = NULL;
 	port->ops = &ulite_ops;
 	port->irq = irq;