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 "drmP.h"
34 #include "drm.h"
35 #include "r128_drm.h"
36 #include "r128_drv.h"
37
38 u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
39 {
40 const drm_r128_private_t *dev_priv = dev->dev_private;
41
42 if (crtc != 0)
43 return 0;
44
45 return atomic_read(&dev_priv->vbl_received);
46 }
47
48 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
49 {
50 struct drm_device *dev = (struct drm_device *) arg;
51 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
52 int status;
53
54 status = R128_READ(R128_GEN_INT_STATUS);
55
56 /* VBLANK interrupt */
57 if (status & R128_CRTC_VBLANK_INT) {
58 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
59 atomic_inc(&dev_priv->vbl_received);
60 drm_handle_vblank(dev, 0);
61 return IRQ_HANDLED;
62 }
63 return IRQ_NONE;
64 }
65
66 int r128_enable_vblank(struct drm_device *dev, int crtc)
67 {
68 drm_r128_private_t *dev_priv = dev->dev_private;
69
70 if (crtc != 0) {
71 DRM_ERROR("%s: bad crtc %d\n", __func__, crtc);
72 return -EINVAL;
73 }
74
75 R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
76 return 0;
77 }
78
79 void r128_disable_vblank(struct drm_device *dev, int crtc)
80 {
81 if (crtc != 0)
82 DRM_ERROR("%s: bad crtc %d\n", __func__, crtc);
83
84 /*
85 * FIXME: implement proper interrupt disable by using the vblank
86 * counter register (if available)
87 *
88 * R128_WRITE(R128_GEN_INT_CNTL,
89 * R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
90 */
91 }
92
93 void r128_driver_irq_preinstall(struct drm_device * dev)
94 {
95 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
96
97 /* Disable *all* interrupts */
98 R128_WRITE(R128_GEN_INT_CNTL, 0);
99 /* Clear vblank bit if it's already high */
100 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
101 }
102
103 int r128_driver_irq_postinstall(struct drm_device *dev)
104 {
105 return 0;
106 }
107
108 void r128_driver_irq_uninstall(struct drm_device * dev)
109 {
110 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
111 if (!dev_priv)
112 return;
113
114 /* Disable *all* interrupts */
115 R128_WRITE(R128_GEN_INT_CNTL, 0);
116 }
117
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