1 /* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
3 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
5 * The Weather Channel (TM) funded Tungsten Graphics to develop the
6 * initial release of the Radeon 8500 driver under the XFree86 license.
7 * This notice must be preserved.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
29 * Keith Whitwell <keith@tungstengraphics.com>
30 * Eric Anholt <anholt@FreeBSD.org>
32 * $FreeBSD: src/sys/dev/drm/mga_irq.c,v 1.1.2.1 2003/04/26 07:05:29 anholt Exp $
33 * $DragonFly: src/sys/dev/drm/mga/Attic/mga_irq.c,v 1.2 2003/06/17 04:28:24 dillon Exp $
36 #include "dev/drm/mga.h"
37 #include "dev/drm/drmP.h"
38 #include "dev/drm/drm.h"
39 #include "dev/drm/mga_drm.h"
40 #include "dev/drm/mga_drv.h"
42 void mga_dma_service( DRM_IRQ_ARGS )
44 drm_device_t *dev = (drm_device_t *) arg;
45 drm_mga_private_t *dev_priv =
46 (drm_mga_private_t *)dev->dev_private;
49 status = MGA_READ( MGA_STATUS );
51 /* VBLANK interrupt */
52 if ( status & MGA_VLINEPEN ) {
53 MGA_WRITE( MGA_ICLEAR, MGA_VLINEICLR );
54 atomic_inc(&dev->vbl_received);
55 DRM_WAKEUP(&dev->vbl_queue);
56 DRM(vbl_send_signals)( dev );
60 int mga_vblank_wait(drm_device_t *dev, unsigned int *sequence)
62 unsigned int cur_vblank;
65 /* Assume that the user has missed the current sequence number
66 * by about a day rather than she wants to wait for years
67 * using vertical blanks...
69 DRM_WAIT_ON( ret, dev->vbl_queue, 3*DRM_HZ,
70 ( ( ( cur_vblank = atomic_read(&dev->vbl_received ) )
71 - *sequence ) <= (1<<23) ) );
73 *sequence = cur_vblank;
78 void mga_driver_irq_preinstall( drm_device_t *dev ) {
79 drm_mga_private_t *dev_priv =
80 (drm_mga_private_t *)dev->dev_private;
82 /* Disable *all* interrupts */
83 MGA_WRITE( MGA_IEN, 0 );
84 /* Clear bits if they're already high */
85 MGA_WRITE( MGA_ICLEAR, ~0 );
88 void mga_driver_irq_postinstall( drm_device_t *dev ) {
89 drm_mga_private_t *dev_priv =
90 (drm_mga_private_t *)dev->dev_private;
92 /* Turn on VBL interrupt */
93 MGA_WRITE( MGA_IEN, MGA_VLINEIEN );
96 void mga_driver_irq_uninstall( drm_device_t *dev ) {
97 drm_mga_private_t *dev_priv =
98 (drm_mga_private_t *)dev->dev_private;
100 /* Disable *all* interrupts */
101 MGA_WRITE( MGA_IEN, 0 );