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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: | |
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 | ||
36 | ||
37 | irqreturn_t i830_driver_irq_handler( DRM_IRQ_ARGS ) | |
38 | { | |
39 | drm_device_t *dev = (drm_device_t *)arg; | |
40 | drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private; | |
41 | u16 temp; | |
42 | ||
43 | temp = I830_READ16(I830REG_INT_IDENTITY_R); | |
44 | DRM_DEBUG("%x\n", temp); | |
45 | ||
46 | if ( !( temp & 2 ) ) | |
47 | return IRQ_NONE; | |
48 | ||
49 | I830_WRITE16(I830REG_INT_IDENTITY_R, temp); | |
50 | ||
51 | atomic_inc(&dev_priv->irq_received); | |
52 | wake_up_interruptible(&dev_priv->irq_queue); | |
53 | ||
54 | return IRQ_HANDLED; | |
55 | } | |
56 | ||
c94f7029 | 57 | static int i830_emit_irq(drm_device_t *dev) |
1da177e4 LT |
58 | { |
59 | drm_i830_private_t *dev_priv = dev->dev_private; | |
60 | RING_LOCALS; | |
61 | ||
62 | DRM_DEBUG("%s\n", __FUNCTION__); | |
63 | ||
64 | atomic_inc(&dev_priv->irq_emitted); | |
65 | ||
66 | BEGIN_LP_RING(2); | |
67 | OUT_RING( 0 ); | |
68 | OUT_RING( GFX_OP_USER_INTERRUPT ); | |
69 | ADVANCE_LP_RING(); | |
70 | ||
71 | return atomic_read(&dev_priv->irq_emitted); | |
72 | } | |
73 | ||
74 | ||
c94f7029 | 75 | static int i830_wait_irq(drm_device_t *dev, int irq_nr) |
1da177e4 LT |
76 | { |
77 | drm_i830_private_t *dev_priv = | |
78 | (drm_i830_private_t *)dev->dev_private; | |
79 | DECLARE_WAITQUEUE(entry, current); | |
80 | unsigned long end = jiffies + HZ*3; | |
81 | int ret = 0; | |
82 | ||
83 | DRM_DEBUG("%s\n", __FUNCTION__); | |
84 | ||
85 | if (atomic_read(&dev_priv->irq_received) >= irq_nr) | |
86 | return 0; | |
87 | ||
88 | dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT; | |
89 | ||
90 | add_wait_queue(&dev_priv->irq_queue, &entry); | |
91 | ||
92 | for (;;) { | |
93 | __set_current_state(TASK_INTERRUPTIBLE); | |
94 | if (atomic_read(&dev_priv->irq_received) >= irq_nr) | |
95 | break; | |
96 | if((signed)(end - jiffies) <= 0) { | |
97 | DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n", | |
98 | I830_READ16( I830REG_INT_IDENTITY_R ), | |
99 | I830_READ16( I830REG_INT_MASK_R ), | |
100 | I830_READ16( I830REG_INT_ENABLE_R ), | |
101 | I830_READ16( I830REG_HWSTAM )); | |
102 | ||
103 | ret = -EBUSY; /* Lockup? Missed irq? */ | |
104 | break; | |
105 | } | |
106 | schedule_timeout(HZ*3); | |
107 | if (signal_pending(current)) { | |
108 | ret = -EINTR; | |
109 | break; | |
110 | } | |
111 | } | |
112 | ||
113 | __set_current_state(TASK_RUNNING); | |
114 | remove_wait_queue(&dev_priv->irq_queue, &entry); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | ||
119 | /* Needs the lock as it touches the ring. | |
120 | */ | |
121 | int i830_irq_emit( struct inode *inode, struct file *filp, unsigned int cmd, | |
122 | unsigned long arg ) | |
123 | { | |
124 | drm_file_t *priv = filp->private_data; | |
125 | drm_device_t *dev = priv->head->dev; | |
126 | drm_i830_private_t *dev_priv = dev->dev_private; | |
127 | drm_i830_irq_emit_t emit; | |
128 | int result; | |
129 | ||
130 | LOCK_TEST_WITH_RETURN(dev, filp); | |
131 | ||
132 | if ( !dev_priv ) { | |
133 | DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); | |
134 | return -EINVAL; | |
135 | } | |
136 | ||
137 | if (copy_from_user( &emit, (drm_i830_irq_emit_t __user *)arg, sizeof(emit) )) | |
138 | return -EFAULT; | |
139 | ||
140 | result = i830_emit_irq( dev ); | |
141 | ||
142 | if ( copy_to_user( emit.irq_seq, &result, sizeof(int) ) ) { | |
143 | DRM_ERROR( "copy_to_user\n" ); | |
144 | return -EFAULT; | |
145 | } | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | ||
151 | /* Doesn't need the hardware lock. | |
152 | */ | |
153 | int i830_irq_wait( struct inode *inode, struct file *filp, unsigned int cmd, | |
154 | unsigned long arg ) | |
155 | { | |
156 | drm_file_t *priv = filp->private_data; | |
157 | drm_device_t *dev = priv->head->dev; | |
158 | drm_i830_private_t *dev_priv = dev->dev_private; | |
159 | drm_i830_irq_wait_t irqwait; | |
160 | ||
161 | if ( !dev_priv ) { | |
162 | DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); | |
163 | return -EINVAL; | |
164 | } | |
165 | ||
166 | if (copy_from_user( &irqwait, (drm_i830_irq_wait_t __user *)arg, | |
167 | sizeof(irqwait) )) | |
168 | return -EFAULT; | |
169 | ||
170 | return i830_wait_irq( dev, irqwait.irq_seq ); | |
171 | } | |
172 | ||
173 | ||
174 | /* drm_dma.h hooks | |
175 | */ | |
176 | void i830_driver_irq_preinstall( drm_device_t *dev ) { | |
177 | drm_i830_private_t *dev_priv = | |
178 | (drm_i830_private_t *)dev->dev_private; | |
179 | ||
180 | I830_WRITE16( I830REG_HWSTAM, 0xffff ); | |
181 | I830_WRITE16( I830REG_INT_MASK_R, 0x0 ); | |
182 | I830_WRITE16( I830REG_INT_ENABLE_R, 0x0 ); | |
183 | atomic_set(&dev_priv->irq_received, 0); | |
184 | atomic_set(&dev_priv->irq_emitted, 0); | |
185 | init_waitqueue_head(&dev_priv->irq_queue); | |
186 | } | |
187 | ||
188 | void i830_driver_irq_postinstall( drm_device_t *dev ) { | |
189 | drm_i830_private_t *dev_priv = | |
190 | (drm_i830_private_t *)dev->dev_private; | |
191 | ||
192 | I830_WRITE16( I830REG_INT_ENABLE_R, 0x2 ); | |
193 | } | |
194 | ||
195 | void i830_driver_irq_uninstall( drm_device_t *dev ) { | |
196 | drm_i830_private_t *dev_priv = | |
197 | (drm_i830_private_t *)dev->dev_private; | |
198 | if (!dev_priv) | |
199 | return; | |
200 | ||
201 | I830_WRITE16( I830REG_INT_MASK_R, 0xffff ); | |
202 | I830_WRITE16( I830REG_INT_ENABLE_R, 0x0 ); | |
203 | } |