[PATCH 3/5] altera_uart: Add support for getting mapbase and IRQ from resources

[Anton Vorontsov <cbouatmailru@gmail.com>]

This makes it much easier to integrate the driver with the rest of
the Linux (e.g. MFD subsystem).

The old method is still supported though.

Also, from now on, there is one platform device per port (no
changes are needed for the platform code, as no one registers
the devices anywhere in-tree yet).

Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
---
 drivers/serial/altera_uart.c |   57 +++++++++++++++++++++++++----------------
 1 files changed, 35 insertions(+), 22 deletions(-)

diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c
index 2603f59..7686aaa 100644
--- a/drivers/serial/altera_uart.c
+++ b/drivers/serial/altera_uart.c
@@ -497,38 +497,51 @@ static int __devinit altera_uart_probe(struct platform_device *pdev)
 {
 	struct altera_uart_platform_uart *platp = pdev->dev.platform_data;
 	struct uart_port *port;
-	int i;
+	struct resource *res_mem;
+	struct resource *res_irq;
+	int i = pdev->id;
 
-	for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS && platp[i].mapbase; i++) {
-		port = &altera_uart_ports[i].port;
+	/* -1 emphasizes that the platform must have one port, no .N suffix */
+	if (i == -1)
+		i = 0;
 
-		port->line = i;
-		port->type = PORT_ALTERA_UART;
-		port->mapbase = platp[i].mapbase;
-		port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
-		port->iotype = SERIAL_IO_MEM;
-		port->irq = platp[i].irq;
-		port->uartclk = platp[i].uartclk;
-		port->ops = &altera_uart_ops;
-		port->flags = ASYNC_BOOT_AUTOCONF;
+	if (i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
+		return -EINVAL;
 
-		uart_add_one_port(&altera_uart_driver, port);
-	}
+	port = &altera_uart_ports[i].port;
+
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res_mem)
+		port->mapbase = res_mem->start;
+	else if (platp->mapbase)
+		port->mapbase = platp->mapbase;
+	else
+		return -EINVAL;
+
+	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (res_irq)
+		port->irq = res_irq->start;
+	else if (platp->irq)
+		port->irq = platp->irq;
+
+	port->line = i;
+	port->type = PORT_ALTERA_UART;
+	port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
+	port->iotype = SERIAL_IO_MEM;
+	port->uartclk = platp->uartclk;
+	port->ops = &altera_uart_ops;
+	port->flags = ASYNC_BOOT_AUTOCONF;
+
+	uart_add_one_port(&altera_uart_driver, port);
 
 	return 0;
 }
 
 static int __devexit altera_uart_remove(struct platform_device *pdev)
 {
-	struct uart_port *port;
-	int i;
-
-	for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++) {
-		port = &altera_uart_ports[i].port;
-		if (port)
-			uart_remove_one_port(&altera_uart_driver, port);
-	}
+	struct uart_port *port = &altera_uart_ports[pdev->id].port;
 
+	uart_remove_one_port(&altera_uart_driver, port);
 	return 0;
 }
 
-- 
1.7.0.5