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 <drm/drm_device.h>
34 #include <drm/drm_print.h>
35 #include <drm/drm_vblank.h>
36 #include <drm/r128_drm.h>
37
38 #include "r128_drv.h"
39
40 u32 r128_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
41 {
42 const drm_r128_private_t *dev_priv = dev->dev_private;
43
44 if (pipe != 0)
45 return 0;
46
47 return atomic_read(&dev_priv->vbl_received);
48 }
49
50 irqreturn_t r128_driver_irq_handler(int irq, void *arg)
51 {
52 struct drm_device *dev = (struct drm_device *) arg;
53 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
54 int status;
55
56 status = R128_READ(R128_GEN_INT_STATUS);
57
58 /* VBLANK interrupt */
59 if (status & R128_CRTC_VBLANK_INT) {
60 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
61 atomic_inc(&dev_priv->vbl_received);
62 drm_handle_vblank(dev, 0);
63 return IRQ_HANDLED;
64 }
65 return IRQ_NONE;
66 }
67
68 int r128_enable_vblank(struct drm_device *dev, unsigned int pipe)
69 {
70 drm_r128_private_t *dev_priv = dev->dev_private;
71
72 if (pipe != 0) {
73 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe);
74 return -EINVAL;
75 }
76
77 R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
78 return 0;
79 }
80
81 void r128_disable_vblank(struct drm_device *dev, unsigned int pipe)
82 {
83 if (pipe != 0)
84 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe);
85
86 /*
87 * FIXME: implement proper interrupt disable by using the vblank
88 * counter register (if available)
89 *
90 * R128_WRITE(R128_GEN_INT_CNTL,
91 * R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
92 */
93 }
94
95 void r128_driver_irq_preinstall(struct drm_device *dev)
96 {
97 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
98
99 /* Disable *all* interrupts */
100 R128_WRITE(R128_GEN_INT_CNTL, 0);
101 /* Clear vblank bit if it's already high */
102 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
103 }
104
105 int r128_driver_irq_postinstall(struct drm_device *dev)
106 {
107 return 0;
108 }
109
110 void r128_driver_irq_uninstall(struct drm_device *dev)
111 {
112 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
113 if (!dev_priv)
114 return;
115
116 /* Disable *all* interrupts */
117 R128_WRITE(R128_GEN_INT_CNTL, 0);
118 }