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1da177e4 LT |
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: | |
b5e89ed5 | 12 | * |
1da177e4 LT |
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. | |
b5e89ed5 | 16 | * |
1da177e4 LT |
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 | ||
b5e89ed5 | 36 | irqreturn_t i830_driver_irq_handler(DRM_IRQ_ARGS) |
1da177e4 | 37 | { |
eddca551 | 38 | struct drm_device *dev = (struct drm_device *) arg; |
b5e89ed5 DA |
39 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; |
40 | u16 temp; | |
1da177e4 | 41 | |
b5e89ed5 | 42 | temp = I830_READ16(I830REG_INT_IDENTITY_R); |
1da177e4 LT |
43 | DRM_DEBUG("%x\n", temp); |
44 | ||
b5e89ed5 | 45 | if (!(temp & 2)) |
1da177e4 LT |
46 | return IRQ_NONE; |
47 | ||
b5e89ed5 | 48 | I830_WRITE16(I830REG_INT_IDENTITY_R, temp); |
1da177e4 LT |
49 | |
50 | atomic_inc(&dev_priv->irq_received); | |
b5e89ed5 | 51 | wake_up_interruptible(&dev_priv->irq_queue); |
1da177e4 LT |
52 | |
53 | return IRQ_HANDLED; | |
54 | } | |
55 | ||
eddca551 | 56 | static int i830_emit_irq(struct drm_device * dev) |
1da177e4 LT |
57 | { |
58 | drm_i830_private_t *dev_priv = dev->dev_private; | |
59 | RING_LOCALS; | |
60 | ||
61 | DRM_DEBUG("%s\n", __FUNCTION__); | |
62 | ||
63 | atomic_inc(&dev_priv->irq_emitted); | |
64 | ||
b5e89ed5 DA |
65 | BEGIN_LP_RING(2); |
66 | OUT_RING(0); | |
67 | OUT_RING(GFX_OP_USER_INTERRUPT); | |
68 | ADVANCE_LP_RING(); | |
1da177e4 LT |
69 | |
70 | return atomic_read(&dev_priv->irq_emitted); | |
71 | } | |
72 | ||
eddca551 | 73 | static int i830_wait_irq(struct drm_device * dev, int irq_nr) |
1da177e4 | 74 | { |
b5e89ed5 | 75 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; |
1da177e4 | 76 | DECLARE_WAITQUEUE(entry, current); |
b5e89ed5 | 77 | unsigned long end = jiffies + HZ * 3; |
1da177e4 LT |
78 | int ret = 0; |
79 | ||
80 | DRM_DEBUG("%s\n", __FUNCTION__); | |
81 | ||
b5e89ed5 DA |
82 | if (atomic_read(&dev_priv->irq_received) >= irq_nr) |
83 | return 0; | |
1da177e4 LT |
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); | |
b5e89ed5 DA |
91 | if (atomic_read(&dev_priv->irq_received) >= irq_nr) |
92 | break; | |
93 | if ((signed)(end - jiffies) <= 0) { | |
1da177e4 | 94 | DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n", |
b5e89ed5 DA |
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)); | |
1da177e4 | 99 | |
b5e89ed5 | 100 | ret = -EBUSY; /* Lockup? Missed irq? */ |
1da177e4 LT |
101 | break; |
102 | } | |
b5e89ed5 DA |
103 | schedule_timeout(HZ * 3); |
104 | if (signal_pending(current)) { | |
105 | ret = -EINTR; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
115 | /* Needs the lock as it touches the ring. |
116 | */ | |
c153f45f EA |
117 | int i830_irq_emit(struct drm_device *dev, void *data, |
118 | struct drm_file *file_priv) | |
1da177e4 | 119 | { |
1da177e4 | 120 | drm_i830_private_t *dev_priv = dev->dev_private; |
c153f45f | 121 | drm_i830_irq_emit_t *emit = data; |
1da177e4 LT |
122 | int result; |
123 | ||
6c340eac | 124 | LOCK_TEST_WITH_RETURN(dev, file_priv); |
1da177e4 | 125 | |
b5e89ed5 DA |
126 | if (!dev_priv) { |
127 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
1da177e4 LT |
128 | return -EINVAL; |
129 | } | |
130 | ||
b5e89ed5 | 131 | result = i830_emit_irq(dev); |
1da177e4 | 132 | |
c153f45f | 133 | if (copy_to_user(emit->irq_seq, &result, sizeof(int))) { |
b5e89ed5 | 134 | DRM_ERROR("copy_to_user\n"); |
1da177e4 LT |
135 | return -EFAULT; |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
1da177e4 LT |
141 | /* Doesn't need the hardware lock. |
142 | */ | |
c153f45f EA |
143 | int i830_irq_wait(struct drm_device *dev, void *data, |
144 | struct drm_file *file_priv) | |
1da177e4 | 145 | { |
1da177e4 | 146 | drm_i830_private_t *dev_priv = dev->dev_private; |
c153f45f | 147 | drm_i830_irq_wait_t *irqwait = data; |
1da177e4 | 148 | |
b5e89ed5 DA |
149 | if (!dev_priv) { |
150 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
1da177e4 LT |
151 | return -EINVAL; |
152 | } | |
153 | ||
c153f45f | 154 | return i830_wait_irq(dev, irqwait->irq_seq); |
1da177e4 LT |
155 | } |
156 | ||
1da177e4 LT |
157 | /* drm_dma.h hooks |
158 | */ | |
eddca551 | 159 | void i830_driver_irq_preinstall(struct drm_device * dev) |
b5e89ed5 DA |
160 | { |
161 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; | |
1da177e4 | 162 | |
b5e89ed5 DA |
163 | I830_WRITE16(I830REG_HWSTAM, 0xffff); |
164 | I830_WRITE16(I830REG_INT_MASK_R, 0x0); | |
165 | I830_WRITE16(I830REG_INT_ENABLE_R, 0x0); | |
1da177e4 LT |
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 | ||
eddca551 | 171 | void i830_driver_irq_postinstall(struct drm_device * dev) |
b5e89ed5 DA |
172 | { |
173 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; | |
1da177e4 | 174 | |
b5e89ed5 | 175 | I830_WRITE16(I830REG_INT_ENABLE_R, 0x2); |
1da177e4 LT |
176 | } |
177 | ||
eddca551 | 178 | void i830_driver_irq_uninstall(struct drm_device * dev) |
b5e89ed5 DA |
179 | { |
180 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; | |
1da177e4 LT |
181 | if (!dev_priv) |
182 | return; | |
183 | ||
b5e89ed5 DA |
184 | I830_WRITE16(I830REG_INT_MASK_R, 0xffff); |
185 | I830_WRITE16(I830REG_INT_ENABLE_R, 0x0); | |
1da177e4 | 186 | } |