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 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
39 {
40 struct drm_device *dev = (struct drm_device *) arg;
41 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
42 int status;
43
44 status = R128_READ(R128_GEN_INT_STATUS);
45
46 /* VBLANK interrupt */
47 if (status & R128_CRTC_VBLANK_INT) {
48 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
49 atomic_inc(&dev->vbl_received);
50 DRM_WAKEUP(&dev->vbl_queue);
51 drm_vbl_send_signals(dev);
52 return IRQ_HANDLED;
53 }
54 return IRQ_NONE;
55 }
56
57 int r128_driver_vblank_wait(struct drm_device * dev, unsigned int *sequence)
58 {
59 unsigned int cur_vblank;
60 int ret = 0;
61
62 /* Assume that the user has missed the current sequence number
63 * by about a day rather than she wants to wait for years
64 * using vertical blanks...
65 */
66 DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
67 (((cur_vblank = atomic_read(&dev->vbl_received))
68 - *sequence) <= (1 << 23)));
69
70 *sequence = cur_vblank;
71
72 return ret;
73 }
74
75 void r128_driver_irq_preinstall(struct drm_device * dev)
76 {
77 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
78
79 /* Disable *all* interrupts */
80 R128_WRITE(R128_GEN_INT_CNTL, 0);
81 /* Clear vblank bit if it's already high */
82 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
83 }
84
85 void r128_driver_irq_postinstall(struct drm_device * dev)
86 {
87 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
88
89 /* Turn on VBL interrupt */
90 R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
91 }
92
93 void r128_driver_irq_uninstall(struct drm_device * dev)
94 {
95 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
96 if (!dev_priv)
97 return;
98
99 /* Disable *all* interrupts */
100 R128_WRITE(R128_GEN_INT_CNTL, 0);
101 }
102
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