1 /* i830_dma.c -- DMA support for the I830 -*- linux-c -*-
2 *
3 * Copyright 2002 Tungsten Graphics, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 *
25 * Authors: Keith Whitwell <keith@tungstengraphics.com>
26 *
27 */
28
29 #include "drmP.h"
30 #include "drm.h"
31 #include "i830_drm.h"
32 #include "i830_drv.h"
33 #include <linux/interrupt.h> /* For task queue support */
34 #include <linux/delay.h>
35
i830_driver_irq_handler(DRM_IRQ_ARGS)36 irqreturn_t i830_driver_irq_handler(DRM_IRQ_ARGS)
37 {
38 struct drm_device *dev = (struct drm_device *) arg;
39 drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
40 u16 temp;
41
42 temp = I830_READ16(I830REG_INT_IDENTITY_R);
43 DRM_DEBUG("%x\n", temp);
44
45 if (!(temp & 2))
46 return IRQ_NONE;
47
48 I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
49
50 atomic_inc(&dev_priv->irq_received);
51 wake_up_interruptible(&dev_priv->irq_queue);
52
53 return IRQ_HANDLED;
54 }
55
i830_emit_irq(struct drm_device * dev)56 static int i830_emit_irq(struct drm_device * dev)
57 {
58 drm_i830_private_t *dev_priv = dev->dev_private;
59 RING_LOCALS;
60
61 DRM_DEBUG("%s\n", __func__);
62
63 atomic_inc(&dev_priv->irq_emitted);
64
65 BEGIN_LP_RING(2);
66 OUT_RING(0);
67 OUT_RING(GFX_OP_USER_INTERRUPT);
68 ADVANCE_LP_RING();
69
70 return atomic_read(&dev_priv->irq_emitted);
71 }
72
i830_wait_irq(struct drm_device * dev,int irq_nr)73 static int i830_wait_irq(struct drm_device * dev, int irq_nr)
74 {
75 drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
76 DECLARE_WAITQUEUE(entry, current);
77 unsigned long end = jiffies + HZ * 3;
78 int ret = 0;
79
80 DRM_DEBUG("%s\n", __func__);
81
82 if (atomic_read(&dev_priv->irq_received) >= irq_nr)
83 return 0;
84
85 dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
86
87 add_wait_queue(&dev_priv->irq_queue, &entry);
88
89 for (;;) {
90 __set_current_state(TASK_INTERRUPTIBLE);
91 if (atomic_read(&dev_priv->irq_received) >= irq_nr)
92 break;
93 if ((signed)(end - jiffies) <= 0) {
94 DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n",
95 I830_READ16(I830REG_INT_IDENTITY_R),
96 I830_READ16(I830REG_INT_MASK_R),
97 I830_READ16(I830REG_INT_ENABLE_R),
98 I830_READ16(I830REG_HWSTAM));
99
100 ret = -EBUSY; /* Lockup? Missed irq? */
101 break;
102 }
103 schedule_timeout(HZ * 3);
104 if (signal_pending(current)) {
105 ret = -EINTR;
106 break;
107 }
108 }
109
110 __set_current_state(TASK_RUNNING);
111 remove_wait_queue(&dev_priv->irq_queue, &entry);
112 return ret;
113 }
114
115 /* Needs the lock as it touches the ring.
116 */
i830_irq_emit(struct drm_device * dev,void * data,struct drm_file * file_priv)117 int i830_irq_emit(struct drm_device *dev, void *data,
118 struct drm_file *file_priv)
119 {
120 drm_i830_private_t *dev_priv = dev->dev_private;
121 drm_i830_irq_emit_t *emit = data;
122 int result;
123
124 LOCK_TEST_WITH_RETURN(dev, file_priv);
125
126 if (!dev_priv) {
127 DRM_ERROR("%s called with no initialization\n", __func__);
128 return -EINVAL;
129 }
130
131 result = i830_emit_irq(dev);
132
133 if (copy_to_user(emit->irq_seq, &result, sizeof(int))) {
134 DRM_ERROR("copy_to_user\n");
135 return -EFAULT;
136 }
137
138 return 0;
139 }
140
141 /* Doesn't need the hardware lock.
142 */
i830_irq_wait(struct drm_device * dev,void * data,struct drm_file * file_priv)143 int i830_irq_wait(struct drm_device *dev, void *data,
144 struct drm_file *file_priv)
145 {
146 drm_i830_private_t *dev_priv = dev->dev_private;
147 drm_i830_irq_wait_t *irqwait = data;
148
149 if (!dev_priv) {
150 DRM_ERROR("%s called with no initialization\n", __func__);
151 return -EINVAL;
152 }
153
154 return i830_wait_irq(dev, irqwait->irq_seq);
155 }
156
157 /* drm_dma.h hooks
158 */
i830_driver_irq_preinstall(struct drm_device * dev)159 void i830_driver_irq_preinstall(struct drm_device * dev)
160 {
161 drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
162
163 I830_WRITE16(I830REG_HWSTAM, 0xffff);
164 I830_WRITE16(I830REG_INT_MASK_R, 0x0);
165 I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
166 atomic_set(&dev_priv->irq_received, 0);
167 atomic_set(&dev_priv->irq_emitted, 0);
168 init_waitqueue_head(&dev_priv->irq_queue);
169 }
170
i830_driver_irq_postinstall(struct drm_device * dev)171 void i830_driver_irq_postinstall(struct drm_device * dev)
172 {
173 drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
174
175 I830_WRITE16(I830REG_INT_ENABLE_R, 0x2);
176 }
177
i830_driver_irq_uninstall(struct drm_device * dev)178 void i830_driver_irq_uninstall(struct drm_device * dev)
179 {
180 drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
181 if (!dev_priv)
182 return;
183
184 I830_WRITE16(I830REG_INT_MASK_R, 0xffff);
185 I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
186 }
187