drivers/gpu/drm/r128/r128_irq.c

   1 /* r128_irq.c -- IRQ handling for radeon -*- linux-c -*- */
   2 /*
   3  * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
   4  *
   5  * The Weather Channel (TM) funded Tungsten Graphics to develop the
   6  * initial release of the Radeon 8500 driver under the XFree86 license.
   7  * This notice must be preserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  26  * DEALINGS IN THE SOFTWARE.
  27  *
  28  * Authors:
  29  *    Keith Whitwell <keith@tungstengraphics.com>
  30  *    Eric Anholt <anholt@FreeBSD.org>
  31  */
  32
  33 #include "drmP.h"
  34 #include "drm.h"
  35 #include "r128_drm.h"
  36 #include "r128_drv.h"
  37
  38 u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
  39 {
  40         const drm_r128_private_t *dev_priv = dev->dev_private;
  41
  42         if (crtc != 0)
  43                 return 0;
  44
  45         return atomic_read(&dev_priv->vbl_received);
  46 }
  47
  48 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
  49 {
  50         struct drm_device *dev = (struct drm_device *) arg;
  51         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  52         int status;
  53
  54         status = R128_READ(R128_GEN_INT_STATUS);
  55
  56         /* VBLANK interrupt */
  57         if (status & R128_CRTC_VBLANK_INT) {
  58                 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
  59                 atomic_inc(&dev_priv->vbl_received);
  60                 drm_handle_vblank(dev, 0);
  61                 return IRQ_HANDLED;
  62         }
  63         return IRQ_NONE;
  64 }
  65
  66 int r128_enable_vblank(struct drm_device *dev, int crtc)
  67 {
  68         drm_r128_private_t *dev_priv = dev->dev_private;
  69
  70         if (crtc != 0) {
  71                 DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
  72                 return -EINVAL;
  73         }
  74
  75         R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
  76         return 0;
  77 }
  78
  79 void r128_disable_vblank(struct drm_device *dev, int crtc)
  80 {
  81         if (crtc != 0)
  82                 DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
  83
  84         /*
  85          * FIXME: implement proper interrupt disable by using the vblank
  86          * counter register (if available)
  87          *
  88          * R128_WRITE(R128_GEN_INT_CNTL,
  89          *            R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
  90          */
  91 }
  92
  93 void r128_driver_irq_preinstall(struct drm_device *dev)
  94 {
  95         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  96
  97         /* Disable *all* interrupts */
  98         R128_WRITE(R128_GEN_INT_CNTL, 0);
  99         /* Clear vblank bit if it's already high */
 100         R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
 101 }
 102
 103 int r128_driver_irq_postinstall(struct drm_device *dev)
 104 {
 105         return 0;
 106 }
 107
 108 void r128_driver_irq_uninstall(struct drm_device *dev)
 109 {
 110         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
 111         if (!dev_priv)
 112                 return;
 113
 114         /* Disable *all* interrupts */
 115         R128_WRITE(R128_GEN_INT_CNTL, 0);
 116 }