[ARM] 4998/1: <IMX UART>: do not use hardcoded io space size

Do not use hardcoded io space size. Instead use the information provided
by the resource.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index dd1e071834be..0ce2b4a45e6d 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -167,11 +167,6 @@
 #define MINOR_START             41
 
 /*
- * This is the size of our serial port register set.
- */
-#define UART_PORT_SIZE  0x100
-
-/*
  * This determines how often we check the modem status signals
  * for any change.  They generally aren't connected to an IRQ
  * so we have to poll them.  We also check immediately before
@@ -721,9 +716,11 @@ static const char *imx_type(struct uart_port *port)
  */
 static void imx_release_port(struct uart_port *port)
 {
-        struct imx_port *sport = (struct imx_port *)port;
+        struct platform_device *pdev = to_platform_device(port->dev);
+        struct resource *mmres;
 
-        release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
+        mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(mmres->start, mmres->end - mmres->start + 1);
 }
 
 /*
@@ -731,10 +728,18 @@ static void imx_release_port(struct uart_port *port)
  */
 static int imx_request_port(struct uart_port *port)
 {
-        struct imx_port *sport = (struct imx_port *)port;
+        struct platform_device *pdev = to_platform_device(port->dev);
+        struct resource *mmres;
+        void *ret;
+
+        mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mmres)
+                return -ENODEV;
+
+        ret = request_mem_region(mmres->start, mmres->end - mmres->start + 1,
+                        "imx-uart");
 
-        return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
-                        "imx-uart") != NULL ? 0 : -EBUSY;
+        return  ret ? 0 : -EBUSY;
 }
 
 /*