1 /* i830_dma.c -- DMA support for the I830 -*- linux-c -*-
3 * Copyright 2002 Tungsten Graphics, Inc.
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:
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
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.
25 * Authors: Keith Whitwell <keith@tungstengraphics.com>
34 #include <linux/interrupt.h> /* For task queue support */
35 #include <linux/delay.h>
38 irqreturn_t DRM(irq_handler)( DRM_IRQ_ARGS )
40 drm_device_t *dev = (drm_device_t *)arg;
41 drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private;
44 temp = I830_READ16(I830REG_INT_IDENTITY_R);
45 DRM_DEBUG("%x\n", temp);
50 I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
52 atomic_inc(&dev_priv->irq_received);
53 wake_up_interruptible(&dev_priv->irq_queue);
59 int i830_emit_irq(drm_device_t *dev)
61 drm_i830_private_t *dev_priv = dev->dev_private;
64 DRM_DEBUG("%s\n", __FUNCTION__);
66 atomic_inc(&dev_priv->irq_emitted);
70 OUT_RING( GFX_OP_USER_INTERRUPT );
73 return atomic_read(&dev_priv->irq_emitted);
77 int i830_wait_irq(drm_device_t *dev, int irq_nr)
79 drm_i830_private_t *dev_priv =
80 (drm_i830_private_t *)dev->dev_private;
81 DECLARE_WAITQUEUE(entry, current);
82 unsigned long end = jiffies + HZ*3;
85 DRM_DEBUG("%s\n", __FUNCTION__);
87 if (atomic_read(&dev_priv->irq_received) >= irq_nr)
90 dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
92 add_wait_queue(&dev_priv->irq_queue, &entry);
95 current->state = TASK_INTERRUPTIBLE;
96 if (atomic_read(&dev_priv->irq_received) >= irq_nr)
98 if((signed)(end - jiffies) <= 0) {
99 DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n",
100 I830_READ16( I830REG_INT_IDENTITY_R ),
101 I830_READ16( I830REG_INT_MASK_R ),
102 I830_READ16( I830REG_INT_ENABLE_R ),
103 I830_READ16( I830REG_HWSTAM ));
105 ret = -EBUSY; /* Lockup? Missed irq? */
108 schedule_timeout(HZ*3);
109 if (signal_pending(current)) {
115 current->state = TASK_RUNNING;
116 remove_wait_queue(&dev_priv->irq_queue, &entry);
121 /* Needs the lock as it touches the ring.
123 int i830_irq_emit( struct inode *inode, struct file *filp, unsigned int cmd,
124 unsigned long __user arg )
126 drm_file_t *priv = filp->private_data;
127 drm_device_t *dev = priv->dev;
128 drm_i830_private_t *dev_priv = dev->dev_private;
129 drm_i830_irq_emit_t emit;
132 if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
133 DRM_ERROR("i830_irq_emit called without lock held\n");
138 DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
142 if (copy_from_user( &emit, (drm_i830_irq_emit_t *)arg, sizeof(emit) ))
145 result = i830_emit_irq( dev );
147 if ( copy_to_user( emit.irq_seq, &result, sizeof(int) ) ) {
148 DRM_ERROR( "copy_to_user\n" );
156 /* Doesn't need the hardware lock.
158 int i830_irq_wait( struct inode *inode, struct file *filp, unsigned int cmd,
161 drm_file_t *priv = filp->private_data;
162 drm_device_t *dev = priv->dev;
163 drm_i830_private_t *dev_priv = dev->dev_private;
164 drm_i830_irq_wait_t irqwait;
167 DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
171 if (copy_from_user( &irqwait, (drm_i830_irq_wait_t *)arg,
175 return i830_wait_irq( dev, irqwait.irq_seq );
181 void DRM(driver_irq_preinstall)( drm_device_t *dev ) {
182 drm_i830_private_t *dev_priv =
183 (drm_i830_private_t *)dev->dev_private;
185 I830_WRITE16( I830REG_HWSTAM, 0xffff );
186 I830_WRITE16( I830REG_INT_MASK_R, 0x0 );
187 I830_WRITE16( I830REG_INT_ENABLE_R, 0x0 );
188 atomic_set(&dev_priv->irq_received, 0);
189 atomic_set(&dev_priv->irq_emitted, 0);
190 init_waitqueue_head(&dev_priv->irq_queue);
193 void DRM(driver_irq_postinstall)( drm_device_t *dev ) {
194 drm_i830_private_t *dev_priv =
195 (drm_i830_private_t *)dev->dev_private;
197 I830_WRITE16( I830REG_INT_ENABLE_R, 0x2 );
200 void DRM(driver_irq_uninstall)( drm_device_t *dev ) {
201 drm_i830_private_t *dev_priv =
202 (drm_i830_private_t *)dev->dev_private;
206 I830_WRITE16( I830REG_INT_MASK_R, 0xffff );
207 I830_WRITE16( I830REG_INT_ENABLE_R, 0x0 );