1 /* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
2 */
3 /*-
4 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
5 *
6 * The Weather Channel (TM) funded Tungsten Graphics to develop the
7 * initial release of the Radeon 8500 driver under the XFree86 license.
8 * This notice must be preserved.
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice (including the next
18 * paragraph) shall be included in all copies or substantial portions of the
19 * Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
28 *
29 * Authors:
30 * Keith Whitwell <keith@tungstengraphics.com>
31 * Eric Anholt <anholt@FreeBSD.org>
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include "dev/drm/drmP.h"
38 #include "dev/drm/drm.h"
39 #include "dev/drm/mga_drm.h"
40 #include "dev/drm/mga_drv.h"
41
mga_get_vblank_counter(struct drm_device * dev,int crtc)42 u32 mga_get_vblank_counter(struct drm_device *dev, int crtc)
43 {
44 const drm_mga_private_t *const dev_priv =
45 (drm_mga_private_t *) dev->dev_private;
46
47 if (crtc != 0) {
48 return 0;
49 }
50
51
52 return atomic_read(&dev_priv->vbl_received);
53 }
54
55
mga_driver_irq_handler(DRM_IRQ_ARGS)56 irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS)
57 {
58 struct drm_device *dev = (struct drm_device *) arg;
59 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
60 int status;
61 int handled = 0;
62
63 status = MGA_READ(MGA_STATUS);
64
65 /* VBLANK interrupt */
66 if (status & MGA_VLINEPEN) {
67 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
68 atomic_inc(&dev_priv->vbl_received);
69 drm_handle_vblank(dev, 0);
70 handled = 1;
71 }
72
73 /* SOFTRAP interrupt */
74 if (status & MGA_SOFTRAPEN) {
75 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
76 const u32 prim_end = MGA_READ(MGA_PRIMEND);
77
78
79 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
80
81 /* In addition to clearing the interrupt-pending bit, we
82 * have to write to MGA_PRIMEND to re-start the DMA operation.
83 */
84 if ((prim_start & ~0x03) != (prim_end & ~0x03)) {
85 MGA_WRITE(MGA_PRIMEND, prim_end);
86 }
87
88 atomic_inc(&dev_priv->last_fence_retired);
89 DRM_WAKEUP(&dev_priv->fence_queue);
90 handled = 1;
91 }
92
93 if (handled)
94 return IRQ_HANDLED;
95 return IRQ_NONE;
96 }
97
mga_enable_vblank(struct drm_device * dev,int crtc)98 int mga_enable_vblank(struct drm_device *dev, int crtc)
99 {
100 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
101
102 if (crtc != 0) {
103 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
104 crtc);
105 return 0;
106 }
107
108 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
109 return 0;
110 }
111
112
mga_disable_vblank(struct drm_device * dev,int crtc)113 void mga_disable_vblank(struct drm_device *dev, int crtc)
114 {
115 if (crtc != 0) {
116 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
117 crtc);
118 }
119
120 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have
121 * a nice hardware counter that tracks the number of refreshes when
122 * the interrupt is disabled, and the kernel doesn't know the refresh
123 * rate to calculate an estimate.
124 */
125 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */
126 }
127
mga_driver_fence_wait(struct drm_device * dev,unsigned int * sequence)128 int mga_driver_fence_wait(struct drm_device * dev, unsigned int *sequence)
129 {
130 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
131 unsigned int cur_fence;
132 int ret = 0;
133
134 /* Assume that the user has missed the current sequence number
135 * by about a day rather than she wants to wait for years
136 * using fences.
137 */
138 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ,
139 (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
140 - *sequence) <= (1 << 23)));
141
142 if (ret == -ERESTART)
143 DRM_DEBUG("restarting syscall\n");
144
145 *sequence = cur_fence;
146
147 return ret;
148 }
149
mga_driver_irq_preinstall(struct drm_device * dev)150 void mga_driver_irq_preinstall(struct drm_device * dev)
151 {
152 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
153
154 /* Disable *all* interrupts */
155 MGA_WRITE(MGA_IEN, 0);
156 /* Clear bits if they're already high */
157 MGA_WRITE(MGA_ICLEAR, ~0);
158 }
159
mga_driver_irq_postinstall(struct drm_device * dev)160 int mga_driver_irq_postinstall(struct drm_device * dev)
161 {
162 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
163
164 DRM_INIT_WAITQUEUE(&dev_priv->fence_queue);
165
166 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled
167 * in mga_enable_vblank.
168 */
169 MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN);
170 return 0;
171 }
172
mga_driver_irq_uninstall(struct drm_device * dev)173 void mga_driver_irq_uninstall(struct drm_device * dev)
174 {
175 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
176 if (!dev_priv)
177 return;
178
179 /* Disable *all* interrupts */
180 MGA_WRITE(MGA_IEN, 0);
181
182 dev->irq_enabled = 0;
183 }
184