/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
 37irqreturn_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
 57
 58int i830_emit_irq(drm_device_t *dev)
 59{
 60	drm_i830_private_t *dev_priv = dev->dev_private;
 61	RING_LOCALS;
 62
 63	DRM_DEBUG("%s\n", __FUNCTION__);
 64
 65	atomic_inc(&dev_priv->irq_emitted);
 66
 67   	BEGIN_LP_RING(2);
 68      	OUT_RING( 0 );
 69      	OUT_RING( GFX_OP_USER_INTERRUPT );
 70      	ADVANCE_LP_RING();
 71
 72	return atomic_read(&dev_priv->irq_emitted);
 73}
 74
 75
 76int i830_wait_irq(drm_device_t *dev, int irq_nr)
 77{
 78  	drm_i830_private_t *dev_priv = 
 79	   (drm_i830_private_t *)dev->dev_private;
 80	DECLARE_WAITQUEUE(entry, current);
 81	unsigned long end = jiffies + HZ*3;
 82	int ret = 0;
 83
 84	DRM_DEBUG("%s\n", __FUNCTION__);
 85
 86 	if (atomic_read(&dev_priv->irq_received) >= irq_nr)  
 87 		return 0; 
 88
 89	dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
 90
 91	add_wait_queue(&dev_priv->irq_queue, &entry);
 92
 93	for (;;) {
 94		__set_current_state(TASK_INTERRUPTIBLE);
 95	   	if (atomic_read(&dev_priv->irq_received) >= irq_nr) 
 96		   break;
 97		if((signed)(end - jiffies) <= 0) {
 98			DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n",
 99				  I830_READ16( I830REG_INT_IDENTITY_R ),
100				  I830_READ16( I830REG_INT_MASK_R ),
101				  I830_READ16( I830REG_INT_ENABLE_R ),
102				  I830_READ16( I830REG_HWSTAM ));
103
104		   	ret = -EBUSY;	/* Lockup?  Missed irq? */
105			break;
106		}
107	      	schedule_timeout(HZ*3);
108	      	if (signal_pending(current)) {
109		   	ret = -EINTR;
110			break;
111		}
112	}
113
114	__set_current_state(TASK_RUNNING);
115	remove_wait_queue(&dev_priv->irq_queue, &entry);
116	return ret;
117}
118
119
120/* Needs the lock as it touches the ring.
121 */
122int i830_irq_emit( struct inode *inode, struct file *filp, unsigned int cmd,
123		   unsigned long arg )
124{
125	drm_file_t	  *priv	    = filp->private_data;
126	drm_device_t	  *dev	    = priv->head->dev;
127	drm_i830_private_t *dev_priv = dev->dev_private;
128	drm_i830_irq_emit_t emit;
129	int result;
130
131	LOCK_TEST_WITH_RETURN(dev, filp);
132
133	if ( !dev_priv ) {
134		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
135		return -EINVAL;
136	}
137
138	if (copy_from_user( &emit, (drm_i830_irq_emit_t __user *)arg, sizeof(emit) ))
139		return -EFAULT;
140
141	result = i830_emit_irq( dev );
142
143	if ( copy_to_user( emit.irq_seq, &result, sizeof(int) ) ) {
144		DRM_ERROR( "copy_to_user\n" );
145		return -EFAULT;
146	}
147
148	return 0;
149}
150
151
152/* Doesn't need the hardware lock.
153 */
154int i830_irq_wait( struct inode *inode, struct file *filp, unsigned int cmd,
155		   unsigned long arg )
156{
157	drm_file_t	  *priv	    = filp->private_data;
158	drm_device_t	  *dev	    = priv->head->dev;
159	drm_i830_private_t *dev_priv = dev->dev_private;
160	drm_i830_irq_wait_t irqwait;
161
162	if ( !dev_priv ) {
163		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
164		return -EINVAL;
165	}
166
167	if (copy_from_user( &irqwait, (drm_i830_irq_wait_t __user *)arg, 
168			    sizeof(irqwait) ))
169		return -EFAULT;
170
171	return i830_wait_irq( dev, irqwait.irq_seq );
172}
173
174
175/* drm_dma.h hooks
176*/
177void i830_driver_irq_preinstall( drm_device_t *dev ) {
178	drm_i830_private_t *dev_priv =
179		(drm_i830_private_t *)dev->dev_private;
180
181	I830_WRITE16( I830REG_HWSTAM, 0xffff );
182	I830_WRITE16( I830REG_INT_MASK_R, 0x0 );
183	I830_WRITE16( I830REG_INT_ENABLE_R, 0x0 );
184	atomic_set(&dev_priv->irq_received, 0);
185	atomic_set(&dev_priv->irq_emitted, 0);
186	init_waitqueue_head(&dev_priv->irq_queue);
187}
188
189void i830_driver_irq_postinstall( drm_device_t *dev ) {
190	drm_i830_private_t *dev_priv =
191		(drm_i830_private_t *)dev->dev_private;
192
193	I830_WRITE16( I830REG_INT_ENABLE_R, 0x2 );
194}
195
196void i830_driver_irq_uninstall( drm_device_t *dev ) {
197	drm_i830_private_t *dev_priv =
198		(drm_i830_private_t *)dev->dev_private;
199	if (!dev_priv)
200		return;
201
202	I830_WRITE16( I830REG_INT_MASK_R, 0xffff );
203	I830_WRITE16( I830REG_INT_ENABLE_R, 0x0 );
204}