1 /* r128_irq.c -- IRQ handling for radeon -*- linux-c -*- */
2 /*-
3 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
4 *
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.
8 *
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:
15 *
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
18 * Software.
19 *
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.
27 *
28 * Authors:
29 * Keith Whitwell <keith@tungstengraphics.com>
30 * Eric Anholt <anholt@FreeBSD.org>
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: stable/9/sys/dev/drm/r128_irq.c 189130 2009-02-28 02:37:55Z rnoland $");
35
36 #include "dev/drm/drmP.h"
37 #include "dev/drm/drm.h"
38 #include "dev/drm/r128_drm.h"
39 #include "dev/drm/r128_drv.h"
40
r128_get_vblank_counter(struct drm_device * dev,int crtc)41 u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
42 {
43 const drm_r128_private_t *dev_priv = dev->dev_private;
44
45 if (crtc != 0)
46 return 0;
47
48 return atomic_read(&dev_priv->vbl_received);
49 }
50
r128_driver_irq_handler(DRM_IRQ_ARGS)51 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
52 {
53 struct drm_device *dev = (struct drm_device *) arg;
54 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
55 int status;
56
57 status = R128_READ(R128_GEN_INT_STATUS);
58
59 /* VBLANK interrupt */
60 if (status & R128_CRTC_VBLANK_INT) {
61 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
62 atomic_inc(&dev_priv->vbl_received);
63 drm_handle_vblank(dev, 0);
64 return IRQ_HANDLED;
65 }
66 return IRQ_NONE;
67 }
68
r128_enable_vblank(struct drm_device * dev,int crtc)69 int r128_enable_vblank(struct drm_device *dev, int crtc)
70 {
71 drm_r128_private_t *dev_priv = dev->dev_private;
72
73 if (crtc != 0) {
74 DRM_ERROR("%s: bad crtc %d\n", __FUNCTION__, crtc);
75 return -EINVAL;
76 }
77
78 R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
79 return 0;
80 }
81
r128_disable_vblank(struct drm_device * dev,int crtc)82 void r128_disable_vblank(struct drm_device *dev, int crtc)
83 {
84 if (crtc != 0)
85 DRM_ERROR("%s: bad crtc %d\n", __FUNCTION__, crtc);
86
87 /*
88 * FIXME: implement proper interrupt disable by using the vblank
89 * counter register (if available)
90 *
91 * R128_WRITE(R128_GEN_INT_CNTL,
92 * R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
93 */
94 }
95
r128_driver_irq_preinstall(struct drm_device * dev)96 void r128_driver_irq_preinstall(struct drm_device * dev)
97 {
98 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
99
100 /* Disable *all* interrupts */
101 R128_WRITE(R128_GEN_INT_CNTL, 0);
102 /* Clear vblank bit if it's already high */
103 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
104 }
105
r128_driver_irq_postinstall(struct drm_device * dev)106 int r128_driver_irq_postinstall(struct drm_device * dev)
107 {
108 return 0;
109 }
110
r128_driver_irq_uninstall(struct drm_device * dev)111 void r128_driver_irq_uninstall(struct drm_device * dev)
112 {
113 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
114 if (!dev_priv)
115 return;
116
117 /* Disable *all* interrupts */
118 R128_WRITE(R128_GEN_INT_CNTL, 0);
119 }
120