1 files changed, 102 insertions, 0 deletions

diff --git a/drivers/char/drm/r128_irq.c b/drivers/char/drm/r128_irq.c
new file mode 100644
index 000000000000..643a30785fe5
--- /dev/null
+++ b/drivers/char/drm/r128_irq.c
@@ -0,0 +1,102 @@
+/* r128_irq.c -- IRQ handling for radeon -*- linux-c -*-
+ *
+ * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
+ * 
+ * The Weather Channel (TM) funded Tungsten Graphics to develop the
+ * initial release of the Radeon 8500 driver under the XFree86 license.
+ * This notice must be preserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Keith Whitwell <keith@tungstengraphics.com>
+ *    Eric Anholt <anholt@FreeBSD.org>
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "r128_drm.h"
+#include "r128_drv.h"
+
+irqreturn_t r128_driver_irq_handler( DRM_IRQ_ARGS )
+{
+        drm_device_t *dev = (drm_device_t *) arg;
+        drm_r128_private_t *dev_priv = 
+           (drm_r128_private_t *)dev->dev_private;
+        int status;
+
+        status = R128_READ( R128_GEN_INT_STATUS );
+        
+        /* VBLANK interrupt */
+        if ( status & R128_CRTC_VBLANK_INT ) {
+                R128_WRITE( R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK );
+                atomic_inc(&dev->vbl_received);
+                DRM_WAKEUP(&dev->vbl_queue);
+                drm_vbl_send_signals( dev );
+                return IRQ_HANDLED;
+        }
+        return IRQ_NONE;
+}
+
+int r128_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
+{
+        unsigned int cur_vblank;
+        int ret = 0;
+
+        /* Assume that the user has missed the current sequence number
+         * by about a day rather than she wants to wait for years
+         * using vertical blanks... 
+         */
+        DRM_WAIT_ON( ret, dev->vbl_queue, 3*DRM_HZ, 
+                     ( ( ( cur_vblank = atomic_read(&dev->vbl_received ) )
+                         - *sequence ) <= (1<<23) ) );
+
+        *sequence = cur_vblank;
+
+        return ret;
+}
+
+void r128_driver_irq_preinstall( drm_device_t *dev ) {
+        drm_r128_private_t *dev_priv = 
+           (drm_r128_private_t *)dev->dev_private;
+
+        /* Disable *all* interrupts */
+        R128_WRITE( R128_GEN_INT_CNTL, 0 );
+        /* Clear vblank bit if it's already high */
+        R128_WRITE( R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK );
+}
+
+void r128_driver_irq_postinstall( drm_device_t *dev ) {
+        drm_r128_private_t *dev_priv = 
+           (drm_r128_private_t *)dev->dev_private;
+
+        /* Turn on VBL interrupt */
+        R128_WRITE( R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN );
+}
+
+void r128_driver_irq_uninstall( drm_device_t *dev ) {
+        drm_r128_private_t *dev_priv = 
+           (drm_r128_private_t *)dev->dev_private;
+        if (!dev_priv)
+                return;
+
+        /* Disable *all* interrupts */
+        R128_WRITE( R128_GEN_INT_CNTL, 0 );
+}