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
  58 int 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
  76 int 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  */
 122 int 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  */
 154 int 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 */
 177 void 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
 189 void 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
 196 void 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 }