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 "i830.h"
  30 #include "drmP.h"
  31 #include "drm.h"
  32 #include "i830_drm.h"
  33 #include "i830_drv.h"
  34 #include <linux/interrupt.h>    /* For task queue support */
  35 #include <linux/delay.h>
  36
  37
  38 irqreturn_t DRM(irq_handler)( DRM_IRQ_ARGS )
  39 {
  40         drm_device_t     *dev = (drm_device_t *)arg;
  41         drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private;
  42         u16 temp;
  43
  44         temp = I830_READ16(I830REG_INT_IDENTITY_R);
  45         DRM_DEBUG("%x\n", temp);
  46
  47         if ( !( temp & 2 ) )
  48                 return IRQ_NONE;
  49
  50         I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
  51
  52         atomic_inc(&dev_priv->irq_received);
  53         wake_up_interruptible(&dev_priv->irq_queue);
  54
  55         return IRQ_HANDLED;
  56 }
  57
  58
  59 int i830_emit_irq(drm_device_t *dev)
  60 {
  61         drm_i830_private_t *dev_priv = dev->dev_private;
  62         RING_LOCALS;
  63
  64         DRM_DEBUG("%s\n", __FUNCTION__);
  65
  66         atomic_inc(&dev_priv->irq_emitted);
  67
  68         BEGIN_LP_RING(2);
  69         OUT_RING( 0 );
  70         OUT_RING( GFX_OP_USER_INTERRUPT );
  71         ADVANCE_LP_RING();
  72
  73         return atomic_read(&dev_priv->irq_emitted);
  74 }
  75
  76
  77 int i830_wait_irq(drm_device_t *dev, int irq_nr)
  78 {
  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;
  83         int ret = 0;
  84
  85         DRM_DEBUG("%s\n", __FUNCTION__);
  86
  87         if (atomic_read(&dev_priv->irq_received) >= irq_nr)
  88                 return 0;
  89
  90         dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
  91
  92         add_wait_queue(&dev_priv->irq_queue, &entry);
  93
  94         for (;;) {
  95                 current->state = TASK_INTERRUPTIBLE;
  96                 if (atomic_read(&dev_priv->irq_received) >= irq_nr)
  97                    break;
  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 ));
 104
 105                         ret = -EBUSY;   /* Lockup?  Missed irq? */
 106                         break;
 107                 }
 108                 schedule_timeout(HZ*3);
 109                 if (signal_pending(current)) {
 110                         ret = -EINTR;
 111                         break;
 112                 }
 113         }
 114
 115         current->state = TASK_RUNNING;
 116         remove_wait_queue(&dev_priv->irq_queue, &entry);
 117         return ret;
 118 }
 119
 120
 121 /* Needs the lock as it touches the ring.
 122  */
 123 int i830_irq_emit( struct inode *inode, struct file *filp, unsigned int cmd,
 124                    unsigned long __user arg )
 125 {
 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;
 130         int result;
 131
 132         if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
 133                 DRM_ERROR("i830_irq_emit called without lock held\n");
 134                 return -EINVAL;
 135         }
 136
 137         if ( !dev_priv ) {
 138                 DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
 139                 return -EINVAL;
 140         }
 141
 142         if (copy_from_user( &emit, (drm_i830_irq_emit_t *)arg, sizeof(emit) ))
 143                 return -EFAULT;
 144
 145         result = i830_emit_irq( dev );
 146
 147         if ( copy_to_user( emit.irq_seq, &result, sizeof(int) ) ) {
 148                 DRM_ERROR( "copy_to_user\n" );
 149                 return -EFAULT;
 150         }
 151
 152         return 0;
 153 }
 154
 155
 156 /* Doesn't need the hardware lock.
 157  */
 158 int i830_irq_wait( struct inode *inode, struct file *filp, unsigned int cmd,
 159                    unsigned long arg )
 160 {
 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;
 165
 166         if ( !dev_priv ) {
 167                 DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
 168                 return -EINVAL;
 169         }
 170
 171         if (copy_from_user( &irqwait, (drm_i830_irq_wait_t *)arg,
 172                             sizeof(irqwait) ))
 173                 return -EFAULT;
 174
 175         return i830_wait_irq( dev, irqwait.irq_seq );
 176 }
 177
 178
 179 /* drm_dma.h hooks
 180 */
 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;
 184
 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);
 191 }
 192
 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;
 196
 197         I830_WRITE16( I830REG_INT_ENABLE_R, 0x2 );
 198 }
 199
 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;
 203         if (!dev_priv)
 204                 return;
 205
 206         I830_WRITE16( I830REG_INT_MASK_R, 0xffff );
 207         I830_WRITE16( I830REG_INT_ENABLE_R, 0x0 );
 208 }