drivers/char: replace remaining __FUNCTION__ occurrences
[linux-2.6.git] / drivers / char / drm / i830_irq.c
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 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
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
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  */
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  */
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 */
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
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
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 }