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
  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
  57 static int i830_emit_irq(drm_device_t *dev)
  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
  75 static int i830_wait_irq(drm_device_t *dev, int irq_nr)
  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 }