From aa296a891d1f3704d40127e998c31dfda531fca7 Mon Sep 17 00:00:00 2001
From: Grant Likely <grant.likely@secretlab.ca>
Date: Wed, 17 Jun 2009 00:30:02 -0600
Subject: [PATCH] fbdev/xilinxfb: Fix improper casting and tighen up probe path

The xilinxfb driver is improperly casting a physical address to a
u32, and the probe routine isn't as straight forward as it could be.
(discovered by gcc spitting out warnings on most recent change to
xilinxfb driver).

This patch fixes the cast and simplifies the probe path.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: John Linn <john.linn@xilinx.com>
---
 drivers/video/xilinxfb.c | 59 ++++++++++++++++------------------------
 1 file changed, 23 insertions(+), 36 deletions(-)

diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
index 7a868bd16e0..ed7c8d0ddcc 100644
--- a/drivers/video/xilinxfb.c
+++ b/drivers/video/xilinxfb.c
@@ -124,7 +124,6 @@ struct xilinxfb_drvdata {
 						registers */
 
 	dcr_host_t      dcr_host;
-	unsigned int    dcr_start;
 	unsigned int    dcr_len;
 
 	void		*fb_virt;	/* virt. address of the frame buffer */
@@ -325,8 +324,8 @@ static int xilinxfb_assign(struct device *dev,
 					drvdata->regs);
 	}
 	/* Put a banner in the log (for DEBUG) */
-	dev_dbg(dev, "fb: phys=%p, virt=%p, size=%x\n",
-		(void *)drvdata->fb_phys, drvdata->fb_virt, fbsize);
+	dev_dbg(dev, "fb: phys=%llx, virt=%p, size=%x\n",
+		(unsigned long long)drvdata->fb_phys, drvdata->fb_virt, fbsize);
 
 	return 0;	/* success */
 
@@ -404,9 +403,7 @@ xilinxfb_of_probe(struct of_device *op, const struct of_device_id *match)
 	u32 tft_access;
 	struct xilinxfb_platform_data pdata;
 	struct resource res;
-	int size, rc;
-	int start = 0, len = 0;
-	dcr_host_t dcr_host;
+	int size, rc, start;
 	struct xilinxfb_drvdata *drvdata;
 
 	/* Copy with the default pdata (not a ptr reference!) */
@@ -414,35 +411,39 @@ xilinxfb_of_probe(struct of_device *op, const struct of_device_id *match)
 
 	dev_dbg(&op->dev, "xilinxfb_of_probe(%p, %p)\n", op, match);
 
+	/* Allocate the driver data region */
+	drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata) {
+		dev_err(&op->dev, "Couldn't allocate device private record\n");
+		return -ENOMEM;
+	}
+
 	/*
 	 * To check whether the core is connected directly to DCR or PLB
 	 * interface and initialize the tft_access accordingly.
 	 */
 	p = (u32 *)of_get_property(op->node, "xlnx,dcr-splb-slave-if", NULL);
-
-	if (p)
-		tft_access = *p;
-	else
-		tft_access = 0;		/* For backward compatibility */
+	tft_access = p ? *p : 0;
 
 	/*
 	 * Fill the resource structure if its direct PLB interface
 	 * otherwise fill the dcr_host structure.
 	 */
 	if (tft_access) {
+		drvdata->flags |= PLB_ACCESS_FLAG;
 		rc = of_address_to_resource(op->node, 0, &res);
 		if (rc) {
 			dev_err(&op->dev, "invalid address\n");
-			return -ENODEV;
+			goto err;
 		}
-
 	} else {
+		res.start = 0;
 		start = dcr_resource_start(op->node, 0);
-		len = dcr_resource_len(op->node, 0);
-		dcr_host = dcr_map(op->node, start, len);
-		if (!DCR_MAP_OK(dcr_host)) {
-			dev_err(&op->dev, "invalid address\n");
-			return -ENODEV;
+		drvdata->dcr_len = dcr_resource_len(op->node, 0);
+		drvdata->dcr_host = dcr_map(op->node, start, drvdata->dcr_len);
+		if (!DCR_MAP_OK(drvdata->dcr_host)) {
+			dev_err(&op->dev, "invalid DCR address\n");
+			goto err;
 		}
 	}
 
@@ -467,26 +468,12 @@ xilinxfb_of_probe(struct of_device *op, const struct of_device_id *match)
 	if (of_find_property(op->node, "rotate-display", NULL))
 		pdata.rotate_screen = 1;
 
-	/* Allocate the driver data region */
-	drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
-	if (!drvdata) {
-		dev_err(&op->dev, "Couldn't allocate device private record\n");
-		return -ENOMEM;
-	}
 	dev_set_drvdata(&op->dev, drvdata);
+	return xilinxfb_assign(&op->dev, drvdata, res.start, &pdata);
 
-	if (tft_access)
-		drvdata->flags |= PLB_ACCESS_FLAG;
-
-	/* Arguments are passed based on the interface */
-	if (drvdata->flags & PLB_ACCESS_FLAG) {
-		return xilinxfb_assign(&op->dev, drvdata, res.start, &pdata);
-	} else {
-		drvdata->dcr_start = start;
-		drvdata->dcr_len = len;
-		drvdata->dcr_host = dcr_host;
-		return xilinxfb_assign(&op->dev, drvdata, 0, &pdata);
-	}
+ err:
+	kfree(drvdata);
+	return -ENODEV;
 }
 
 static int __devexit xilinxfb_of_remove(struct of_device *op)