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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 "drmP.h"
35#include "drm.h"
36#include "mga_drm.h"
37#include "mga_drv.h"
38
39u32 mga_get_vblank_counter(struct drm_device *dev, int crtc)
40{
41 const drm_mga_private_t *const dev_priv =
42 (drm_mga_private_t *) dev->dev_private;
43
44 if (crtc != 0)
45 return 0;
46
47 return atomic_read(&dev_priv->vbl_received);
48}
49
50
51irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS)
52{
53 struct drm_device *dev = (struct drm_device *) arg;
54 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
55 int status;
56 int handled = 0;
57
58 status = MGA_READ(MGA_STATUS);
59
60 /* VBLANK interrupt */
61 if (status & MGA_VLINEPEN) {
62 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
63 atomic_inc(&dev_priv->vbl_received);
64 drm_handle_vblank(dev, 0);
65 handled = 1;
66 }
67
68 /* SOFTRAP interrupt */
69 if (status & MGA_SOFTRAPEN) {
70 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
71 const u32 prim_end = MGA_READ(MGA_PRIMEND);
72
73
74 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
75
76 /* In addition to clearing the interrupt-pending bit, we
77 * have to write to MGA_PRIMEND to re-start the DMA operation.
78 */
79 if ((prim_start & ~0x03) != (prim_end & ~0x03))
80 MGA_WRITE(MGA_PRIMEND, prim_end);
81
82 atomic_inc(&dev_priv->last_fence_retired);
83 DRM_WAKEUP(&dev_priv->fence_queue);
84 handled = 1;
85 }
86
87 if (handled)
88 return IRQ_HANDLED;
89 return IRQ_NONE;
90}
91
92int mga_enable_vblank(struct drm_device *dev, int crtc)
93{
94 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
95
96 if (crtc != 0) {
97 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
98 crtc);
99 return 0;
100 }
101
102 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
103 return 0;
104}
105
106
107void mga_disable_vblank(struct drm_device *dev, int crtc)
108{
109 if (crtc != 0) {
110 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
111 crtc);
112 }
113
114 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have
115 * a nice hardware counter that tracks the number of refreshes when
116 * the interrupt is disabled, and the kernel doesn't know the refresh
117 * rate to calculate an estimate.
118 */
119 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */
120}
121
122int mga_driver_fence_wait(struct drm_device *dev, unsigned int *sequence)
123{
124 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
125 unsigned int cur_fence;
126 int ret = 0;
127
128 /* Assume that the user has missed the current sequence number
129 * by about a day rather than she wants to wait for years
130 * using fences.
131 */
132 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ,
133 (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
134 - *sequence) <= (1 << 23)));
135
136 *sequence = cur_fence;
137
138 return ret;
139}
140
141void mga_driver_irq_preinstall(struct drm_device *dev)
142{
143 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
144
145 /* Disable *all* interrupts */
146 MGA_WRITE(MGA_IEN, 0);
147 /* Clear bits if they're already high */
148 MGA_WRITE(MGA_ICLEAR, ~0);
149}
150
151int mga_driver_irq_postinstall(struct drm_device *dev)
152{
153 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
154
155 DRM_INIT_WAITQUEUE(&dev_priv->fence_queue);
156
157 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled
158 * in mga_enable_vblank.
159 */
160 MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN);
161 return 0;
162}
163
164void mga_driver_irq_uninstall(struct drm_device *dev)
165{
166 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
167 if (!dev_priv)
168 return;
169
170 /* Disable *all* interrupts */
171 MGA_WRITE(MGA_IEN, 0);
172
173 dev->irq_enabled = 0;
174}
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 <drm/drmP.h>
35#include <drm/mga_drm.h>
36#include "mga_drv.h"
37
38u32 mga_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
39{
40 const drm_mga_private_t *const dev_priv =
41 (drm_mga_private_t *) dev->dev_private;
42
43 if (pipe != 0)
44 return 0;
45
46 return atomic_read(&dev_priv->vbl_received);
47}
48
49
50irqreturn_t mga_driver_irq_handler(int irq, void *arg)
51{
52 struct drm_device *dev = (struct drm_device *) arg;
53 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
54 int status;
55 int handled = 0;
56
57 status = MGA_READ(MGA_STATUS);
58
59 /* VBLANK interrupt */
60 if (status & MGA_VLINEPEN) {
61 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
62 atomic_inc(&dev_priv->vbl_received);
63 drm_handle_vblank(dev, 0);
64 handled = 1;
65 }
66
67 /* SOFTRAP interrupt */
68 if (status & MGA_SOFTRAPEN) {
69 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
70 const u32 prim_end = MGA_READ(MGA_PRIMEND);
71
72
73 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
74
75 /* In addition to clearing the interrupt-pending bit, we
76 * have to write to MGA_PRIMEND to re-start the DMA operation.
77 */
78 if ((prim_start & ~0x03) != (prim_end & ~0x03))
79 MGA_WRITE(MGA_PRIMEND, prim_end);
80
81 atomic_inc(&dev_priv->last_fence_retired);
82 wake_up(&dev_priv->fence_queue);
83 handled = 1;
84 }
85
86 if (handled)
87 return IRQ_HANDLED;
88 return IRQ_NONE;
89}
90
91int mga_enable_vblank(struct drm_device *dev, unsigned int pipe)
92{
93 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
94
95 if (pipe != 0) {
96 DRM_ERROR("tried to enable vblank on non-existent crtc %u\n",
97 pipe);
98 return 0;
99 }
100
101 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
102 return 0;
103}
104
105
106void mga_disable_vblank(struct drm_device *dev, unsigned int pipe)
107{
108 if (pipe != 0) {
109 DRM_ERROR("tried to disable vblank on non-existent crtc %u\n",
110 pipe);
111 }
112
113 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have
114 * a nice hardware counter that tracks the number of refreshes when
115 * the interrupt is disabled, and the kernel doesn't know the refresh
116 * rate to calculate an estimate.
117 */
118 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */
119}
120
121int mga_driver_fence_wait(struct drm_device *dev, unsigned int *sequence)
122{
123 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
124 unsigned int cur_fence;
125 int ret = 0;
126
127 /* Assume that the user has missed the current sequence number
128 * by about a day rather than she wants to wait for years
129 * using fences.
130 */
131 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * HZ,
132 (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
133 - *sequence) <= (1 << 23)));
134
135 *sequence = cur_fence;
136
137 return ret;
138}
139
140void mga_driver_irq_preinstall(struct drm_device *dev)
141{
142 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
143
144 /* Disable *all* interrupts */
145 MGA_WRITE(MGA_IEN, 0);
146 /* Clear bits if they're already high */
147 MGA_WRITE(MGA_ICLEAR, ~0);
148}
149
150int mga_driver_irq_postinstall(struct drm_device *dev)
151{
152 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
153
154 init_waitqueue_head(&dev_priv->fence_queue);
155
156 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled
157 * in mga_enable_vblank.
158 */
159 MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN);
160 return 0;
161}
162
163void mga_driver_irq_uninstall(struct drm_device *dev)
164{
165 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
166 if (!dev_priv)
167 return;
168
169 /* Disable *all* interrupts */
170 MGA_WRITE(MGA_IEN, 0);
171
172 dev->irq_enabled = false;
173}