1 /* mach64_irq.c -- IRQ handling for ATI Mach64 -*- linux-c -*-
2 * Created: Tue Feb 25, 2003 by Leif Delgass, based on radeon_irq.c/r128_irq.c
3 */
4 /*-
5 * Copyright (C) The Weather Channel, Inc. 2002.
6 * Copyright 2003 Leif Delgass
7 * All Rights Reserved.
8 *
9 * The Weather Channel (TM) funded Tungsten Graphics to develop the
10 * initial release of the Radeon 8500 driver under the XFree86 license.
11 * This notice must be preserved.
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a
14 * copy of this software and associated documentation files (the "Software"),
15 * to deal in the Software without restriction, including without limitation
16 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
17 * and/or sell copies of the Software, and to permit persons to whom the
18 * Software is furnished to do so, subject to the following conditions:
19 *
20 * The above copyright notice and this permission notice (including the next
21 * paragraph) shall be included in all copies or substantial portions of the
22 * Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
30 * DEALINGS IN THE SOFTWARE.
31 *
32 * Authors:
33 * Keith Whitwell <keith@tungstengraphics.com>
34 * Eric Anholt <anholt@FreeBSD.org>
35 * Leif Delgass <ldelgass@retinalburn.net>
36 */
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: stable/9/sys/dev/drm/mach64_irq.c 189130 2009-02-28 02:37:55Z rnoland $");
40
41 #include "dev/drm/drmP.h"
42 #include "dev/drm/drm.h"
43 #include "dev/drm/mach64_drm.h"
44 #include "dev/drm/mach64_drv.h"
45
mach64_driver_irq_handler(DRM_IRQ_ARGS)46 irqreturn_t mach64_driver_irq_handler(DRM_IRQ_ARGS)
47 {
48 struct drm_device *dev = arg;
49 drm_mach64_private_t *dev_priv = dev->dev_private;
50 int status;
51
52 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
53
54 /* VBLANK interrupt */
55 if (status & MACH64_CRTC_VBLANK_INT) {
56 /* Mask off all interrupt ack bits before setting the ack bit, since
57 * there may be other handlers outside the DRM.
58 *
59 * NOTE: On mach64, you need to keep the enable bits set when doing
60 * the ack, despite what the docs say about not acking and enabling
61 * in a single write.
62 */
63 MACH64_WRITE(MACH64_CRTC_INT_CNTL,
64 (status & ~MACH64_CRTC_INT_ACKS)
65 | MACH64_CRTC_VBLANK_INT);
66
67 atomic_inc(&dev_priv->vbl_received);
68 drm_handle_vblank(dev, 0);
69 return IRQ_HANDLED;
70 }
71 return IRQ_NONE;
72 }
73
mach64_get_vblank_counter(struct drm_device * dev,int crtc)74 u32 mach64_get_vblank_counter(struct drm_device * dev, int crtc)
75 {
76 const drm_mach64_private_t *const dev_priv = dev->dev_private;
77
78 if (crtc != 0)
79 return 0;
80
81 return atomic_read(&dev_priv->vbl_received);
82 }
83
mach64_enable_vblank(struct drm_device * dev,int crtc)84 int mach64_enable_vblank(struct drm_device * dev, int crtc)
85 {
86 drm_mach64_private_t *dev_priv = dev->dev_private;
87 u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
88
89 if (crtc != 0) {
90 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
91 crtc);
92 return -EINVAL;
93 }
94
95 DRM_DEBUG("before enable vblank CRTC_INT_CTNL: 0x%08x\n", status);
96
97 /* Turn on VBLANK interrupt */
98 MACH64_WRITE(MACH64_CRTC_INT_CNTL, MACH64_READ(MACH64_CRTC_INT_CNTL)
99 | MACH64_CRTC_VBLANK_INT_EN);
100
101 return 0;
102 }
103
mach64_disable_vblank(struct drm_device * dev,int crtc)104 void mach64_disable_vblank(struct drm_device * dev, int crtc)
105 {
106 if (crtc != 0) {
107 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
108 crtc);
109 return;
110 }
111
112 /*
113 * FIXME: implement proper interrupt disable by using the vblank
114 * counter register (if available).
115 */
116 }
117
mach64_disable_vblank_local(struct drm_device * dev,int crtc)118 static void mach64_disable_vblank_local(struct drm_device * dev, int crtc)
119 {
120 drm_mach64_private_t *dev_priv = dev->dev_private;
121 u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
122
123 if (crtc != 0) {
124 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
125 crtc);
126 return;
127 }
128
129 DRM_DEBUG("before disable vblank CRTC_INT_CTNL: 0x%08x\n", status);
130
131 /* Disable and clear VBLANK interrupt */
132 MACH64_WRITE(MACH64_CRTC_INT_CNTL, (status & ~MACH64_CRTC_VBLANK_INT_EN)
133 | MACH64_CRTC_VBLANK_INT);
134 }
135
mach64_driver_irq_preinstall(struct drm_device * dev)136 void mach64_driver_irq_preinstall(struct drm_device * dev)
137 {
138 drm_mach64_private_t *dev_priv = dev->dev_private;
139
140 u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
141
142 DRM_DEBUG("before install CRTC_INT_CTNL: 0x%08x\n", status);
143
144 mach64_disable_vblank_local(dev, 0);
145 }
146
mach64_driver_irq_postinstall(struct drm_device * dev)147 int mach64_driver_irq_postinstall(struct drm_device * dev)
148 {
149 return 0;
150 }
151
mach64_driver_irq_uninstall(struct drm_device * dev)152 void mach64_driver_irq_uninstall(struct drm_device * dev)
153 {
154 drm_mach64_private_t *dev_priv = dev->dev_private;
155 if (!dev_priv)
156 return;
157
158 mach64_disable_vblank_local(dev, 0);
159
160 DRM_DEBUG("after uninstall CRTC_INT_CTNL: 0x%08x\n",
161 MACH64_READ(MACH64_CRTC_INT_CNTL));
162 }
163