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1da177e4 LT |
1 | /* mga_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 "mga_drm.h" | |
36 | #include "mga_drv.h" | |
37 | ||
38 | irqreturn_t mga_driver_irq_handler( DRM_IRQ_ARGS ) | |
39 | { | |
40 | drm_device_t *dev = (drm_device_t *) arg; | |
41 | drm_mga_private_t *dev_priv = | |
42 | (drm_mga_private_t *)dev->dev_private; | |
43 | int status; | |
44 | ||
45 | status = MGA_READ( MGA_STATUS ); | |
46 | ||
47 | /* VBLANK interrupt */ | |
48 | if ( status & MGA_VLINEPEN ) { | |
49 | MGA_WRITE( MGA_ICLEAR, MGA_VLINEICLR ); | |
50 | atomic_inc(&dev->vbl_received); | |
51 | DRM_WAKEUP(&dev->vbl_queue); | |
52 | drm_vbl_send_signals( dev ); | |
53 | return IRQ_HANDLED; | |
54 | } | |
55 | return IRQ_NONE; | |
56 | } | |
57 | ||
58 | int mga_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence) | |
59 | { | |
60 | unsigned int cur_vblank; | |
61 | int ret = 0; | |
62 | ||
63 | /* Assume that the user has missed the current sequence number | |
64 | * by about a day rather than she wants to wait for years | |
65 | * using vertical blanks... | |
66 | */ | |
67 | DRM_WAIT_ON( ret, dev->vbl_queue, 3*DRM_HZ, | |
68 | ( ( ( cur_vblank = atomic_read(&dev->vbl_received ) ) | |
69 | - *sequence ) <= (1<<23) ) ); | |
70 | ||
71 | *sequence = cur_vblank; | |
72 | ||
73 | return ret; | |
74 | } | |
75 | ||
76 | void mga_driver_irq_preinstall( drm_device_t *dev ) { | |
77 | drm_mga_private_t *dev_priv = | |
78 | (drm_mga_private_t *)dev->dev_private; | |
79 | ||
80 | /* Disable *all* interrupts */ | |
81 | MGA_WRITE( MGA_IEN, 0 ); | |
82 | /* Clear bits if they're already high */ | |
83 | MGA_WRITE( MGA_ICLEAR, ~0 ); | |
84 | } | |
85 | ||
86 | void mga_driver_irq_postinstall( drm_device_t *dev ) { | |
87 | drm_mga_private_t *dev_priv = | |
88 | (drm_mga_private_t *)dev->dev_private; | |
89 | ||
90 | /* Turn on VBL interrupt */ | |
91 | MGA_WRITE( MGA_IEN, MGA_VLINEIEN ); | |
92 | } | |
93 | ||
94 | void mga_driver_irq_uninstall( drm_device_t *dev ) { | |
95 | drm_mga_private_t *dev_priv = | |
96 | (drm_mga_private_t *)dev->dev_private; | |
97 | if (!dev_priv) | |
98 | return; | |
99 | ||
100 | /* Disable *all* interrupts */ | |
101 | MGA_WRITE( MGA_IEN, 0 ); | |
102 | } |