From 428cbe0b91b1b446b0878544f30121df9b5bb2ac Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@linux.ie>
Date: Wed, 13 Aug 2003 23:35:40 +0000
Subject: DA: patch from Matthew upgraded to latest DRI head to solve issue
 with i810     compatibility

---
 linux-core/i810_dma.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 68 insertions(+), 4 deletions(-)

(limited to 'linux-core/i810_dma.c')

diff --git a/linux-core/i810_dma.c b/linux-core/i810_dma.c
index 88e5b9db..6af9181a 100644
--- a/linux-core/i810_dma.c
+++ b/linux-core/i810_dma.c
@@ -450,6 +450,49 @@ static int i810_dma_initialize(drm_device_t *dev,
    	return 0;
 }
 
+/* i810 DRM version 1.1 used a smaller init structure with different
+ * ordering of values than is currently used (drm >= 1.2). There is
+ * no defined way to detect the XFree version to correct this problem,
+ * however by checking using this procedure we can detect the correct
+ * thing to do.
+ *
+ * #1 Read the Smaller init structure from user-space
+ * #2 Verify the overlay_physical is a valid physical address, or NULL
+ *    If it isn't then we have a v1.1 client. Fix up params.
+ *    If it is, then we have a 1.2 client... get the rest of the data.
+ */
+int i810_dma_init_compat(drm_i810_init_t *init, unsigned long arg)
+{
+
+	/* Get v1.1 init data */
+	if(copy_from_user(init, (drm_i810_pre12_init_t *)arg,
+			  sizeof(drm_i810_pre12_init_t))) {
+		return -EFAULT;
+	}
+
+	if ((!init->overlay_physical) || (init->overlay_physical > 4096)) {
+
+		/* This is a v1.2 client, just get the v1.2 init data */
+		DRM_INFO("Using POST v1.2 init.\n");
+		if(copy_from_user(init, (drm_i810_init_t *)arg,
+				  sizeof(drm_i810_init_t))) {
+			return -EFAULT;
+		}
+	} else {
+
+		/* This is a v1.1 client, fix the params */
+		DRM_INFO("Using PRE v1.2 init.\n");
+	 	init->pitch_bits = init->h;
+	 	init->pitch = init->w;
+	 	init->h = init->overlay_physical;
+	 	init->w = init->overlay_offset;
+	 	init->overlay_physical = 0;
+	 	init->overlay_offset = 0;
+	}
+
+	return 0;
+}
+
 int i810_dma_init(struct inode *inode, struct file *filp,
 		  unsigned int cmd, unsigned long arg)
 {
@@ -459,22 +502,43 @@ int i810_dma_init(struct inode *inode, struct file *filp,
    	drm_i810_init_t init;
    	int retcode = 0;
 
-  	if (copy_from_user(&init, (drm_i810_init_t *)arg, sizeof(init)))
+	/* Get only the init func */
+  	if (copy_from_user(&init, (void *)arg, sizeof(drm_i810_init_func_t))) {
 		return -EFAULT;
+	}
 
    	switch(init.func) {
 	 	case I810_INIT_DMA:
+	 	       	/* This case is for backward compatibility. It
+			 * handles XFree 4.1.0 and 4.2.0, and has to
+			 * do some parameter checking as described below.
+			 * It will someday go away.
+			 */
+			retcode = i810_dma_init_compat(&init, arg);
+			if(retcode) {
+				return retcode;
+			}
+	   		dev_priv = DRM(alloc)(sizeof(drm_i810_private_t),
+					     DRM_MEM_DRIVER);
+	   		if(dev_priv == NULL) return -ENOMEM;
+	   		retcode = i810_dma_initialize(dev, dev_priv, &init);
+	   	break;
+		default:
+	 	case I810_INIT_DMA_1_4:
+			DRM_INFO("Using v1.4 init.\n");
+  			if(copy_from_user(&init, (drm_i810_init_t *)arg,
+					  sizeof(drm_i810_init_t))) {
+				return -EFAULT;
+			}
 	   		dev_priv = DRM(alloc)(sizeof(drm_i810_private_t),
 					     DRM_MEM_DRIVER);
 	   		if(dev_priv == NULL) return -ENOMEM;
 	   		retcode = i810_dma_initialize(dev, dev_priv, &init);
 	   	break;
 	 	case I810_CLEANUP_DMA:
+		        DRM_INFO("DMA Cleanup\n");
 	   		retcode = i810_dma_cleanup(dev);
 	   	break;
-	 	default:
-	   		retcode = -EINVAL;
-	   	break;
 	}
 
    	return retcode;
-- 
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