tty: serial: altera_jtaguart: Support getting mapbase and IRQ from resources

This will make it easier to get the driver to support device tree. The
old platform data method is still supported though.

Also change the driver to use only one platform device per port.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/tty/serial/altera_jtaguart.c

@@ -409,22 +409,45 @@ static int __devinit altera_jtaguart_probe(struct platform_device *pdev)
 {
 	struct altera_jtaguart_platform_uart *platp = pdev->dev.platform_data;
 	struct uart_port *port;
-	int i;
+	struct resource *res_irq, *res_mem;
+	int i = pdev->id;
+
+	/* -1 emphasizes that the platform must have one port, no .N suffix */
+	if (i == -1)
+		i = 0;
+
+	if (i >= ALTERA_JTAGUART_MAXPORTS)
+		return -EINVAL;
 
-	for (i = 0; i < ALTERA_JTAGUART_MAXPORTS && platp[i].mapbase; i++) {
 	port = &altera_jtaguart_ports[i].port;
 
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res_mem)
+		port->mapbase = res_mem->start;
+	else if (platp)
+		port->mapbase = platp->mapbase;
+	else
+		return -ENODEV;
+
+	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (res_irq)
+		port->irq = res_irq->start;
+	else if (platp)
+		port->irq = platp->irq;
+	else
+		return -ENODEV;
+
+	port->membase = ioremap(port->mapbase, ALTERA_JTAGUART_SIZE);
+	if (!port->membase)
+		return -ENOMEM;
+
 	port->line = i;
 	port->type = PORT_ALTERA_JTAGUART;
-		port->mapbase = platp[i].mapbase;
-		port->membase = ioremap(port->mapbase, ALTERA_JTAGUART_SIZE);
 	port->iotype = SERIAL_IO_MEM;
-		port->irq = platp[i].irq;
 	port->ops = &altera_jtaguart_ops;
 	port->flags = ASYNC_BOOT_AUTOCONF;
 
 	uart_add_one_port(&altera_jtaguart_driver, port);
-	}
 
 	return 0;
 }
@@ -432,13 +455,13 @@ static int __devinit altera_jtaguart_probe(struct platform_device *pdev)
 static int __devexit altera_jtaguart_remove(struct platform_device *pdev)
 {
 	struct uart_port *port;
-	int i;
+	int i = pdev->id;
+
+	if (i == -1)
+		i = 0;
 
-	for (i = 0; i < ALTERA_JTAGUART_MAXPORTS; i++) {
 	port = &altera_jtaguart_ports[i].port;
-		if (port)
 	uart_remove_one_port(&altera_jtaguart_driver, port);
-	}
 
 	return 0;
 }