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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 | { |
b5e89ed5 DA |
38 | drm_device_t *dev = (drm_device_t *) arg; |
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 | ||
b5e89ed5 | 56 | static int i830_emit_irq(drm_device_t * 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 | ||
b5e89ed5 | 73 | static int i830_wait_irq(drm_device_t * 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 | */ | |
b5e89ed5 DA |
117 | int i830_irq_emit(struct inode *inode, struct file *filp, unsigned int cmd, |
118 | unsigned long arg) | |
1da177e4 | 119 | { |
b5e89ed5 DA |
120 | drm_file_t *priv = filp->private_data; |
121 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
122 | drm_i830_private_t *dev_priv = dev->dev_private; |
123 | drm_i830_irq_emit_t emit; | |
124 | int result; | |
125 | ||
126 | LOCK_TEST_WITH_RETURN(dev, filp); | |
127 | ||
b5e89ed5 DA |
128 | if (!dev_priv) { |
129 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
1da177e4 LT |
130 | return -EINVAL; |
131 | } | |
132 | ||
b5e89ed5 DA |
133 | if (copy_from_user |
134 | (&emit, (drm_i830_irq_emit_t __user *) arg, sizeof(emit))) | |
1da177e4 LT |
135 | return -EFAULT; |
136 | ||
b5e89ed5 | 137 | result = i830_emit_irq(dev); |
1da177e4 | 138 | |
b5e89ed5 DA |
139 | if (copy_to_user(emit.irq_seq, &result, sizeof(int))) { |
140 | DRM_ERROR("copy_to_user\n"); | |
1da177e4 LT |
141 | return -EFAULT; |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
1da177e4 LT |
147 | /* Doesn't need the hardware lock. |
148 | */ | |
b5e89ed5 DA |
149 | int i830_irq_wait(struct inode *inode, struct file *filp, unsigned int cmd, |
150 | unsigned long arg) | |
1da177e4 | 151 | { |
b5e89ed5 DA |
152 | drm_file_t *priv = filp->private_data; |
153 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
154 | drm_i830_private_t *dev_priv = dev->dev_private; |
155 | drm_i830_irq_wait_t irqwait; | |
156 | ||
b5e89ed5 DA |
157 | if (!dev_priv) { |
158 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
1da177e4 LT |
159 | return -EINVAL; |
160 | } | |
161 | ||
b5e89ed5 DA |
162 | if (copy_from_user(&irqwait, (drm_i830_irq_wait_t __user *) arg, |
163 | sizeof(irqwait))) | |
1da177e4 LT |
164 | return -EFAULT; |
165 | ||
b5e89ed5 | 166 | return i830_wait_irq(dev, irqwait.irq_seq); |
1da177e4 LT |
167 | } |
168 | ||
1da177e4 LT |
169 | /* drm_dma.h hooks |
170 | */ | |
b5e89ed5 DA |
171 | void i830_driver_irq_preinstall(drm_device_t * dev) |
172 | { | |
173 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; | |
1da177e4 | 174 | |
b5e89ed5 DA |
175 | I830_WRITE16(I830REG_HWSTAM, 0xffff); |
176 | I830_WRITE16(I830REG_INT_MASK_R, 0x0); | |
177 | I830_WRITE16(I830REG_INT_ENABLE_R, 0x0); | |
1da177e4 LT |
178 | atomic_set(&dev_priv->irq_received, 0); |
179 | atomic_set(&dev_priv->irq_emitted, 0); | |
180 | init_waitqueue_head(&dev_priv->irq_queue); | |
181 | } | |
182 | ||
b5e89ed5 DA |
183 | void i830_driver_irq_postinstall(drm_device_t * dev) |
184 | { | |
185 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; | |
1da177e4 | 186 | |
b5e89ed5 | 187 | I830_WRITE16(I830REG_INT_ENABLE_R, 0x2); |
1da177e4 LT |
188 | } |
189 | ||
b5e89ed5 DA |
190 | void i830_driver_irq_uninstall(drm_device_t * dev) |
191 | { | |
192 | drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private; | |
1da177e4 LT |
193 | if (!dev_priv) |
194 | return; | |
195 | ||
b5e89ed5 DA |
196 | I830_WRITE16(I830REG_INT_MASK_R, 0xffff); |
197 | I830_WRITE16(I830REG_INT_ENABLE_R, 0x0); | |
1da177e4 | 198 | } |