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 <drm/drmP.h>
  34 #include <drm/r128_drm.h>
  35 #include "r128_drv.h"
  36
  37 u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
  38 {
  39         const drm_r128_private_t *dev_priv = dev->dev_private;
  40
  41         if (crtc != 0)
  42                 return 0;
  43
  44         return atomic_read(&dev_priv->vbl_received);
  45 }
  46
  47 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
  48 {
  49         struct drm_device *dev = (struct drm_device *) arg;
  50         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  51         int status;
  52
  53         status = R128_READ(R128_GEN_INT_STATUS);
  54
  55         /* VBLANK interrupt */
  56         if (status & R128_CRTC_VBLANK_INT) {
  57                 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
  58                 atomic_inc(&dev_priv->vbl_received);
  59                 drm_handle_vblank(dev, 0);
  60                 return IRQ_HANDLED;
  61         }
  62         return IRQ_NONE;
  63 }
  64
  65 int r128_enable_vblank(struct drm_device *dev, int crtc)
  66 {
  67         drm_r128_private_t *dev_priv = dev->dev_private;
  68
  69         if (crtc != 0) {
  70                 DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
  71                 return -EINVAL;
  72         }
  73
  74         R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
  75         return 0;
  76 }
  77
  78 void r128_disable_vblank(struct drm_device *dev, int crtc)
  79 {
  80         if (crtc != 0)
  81                 DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
  82
  83         /*
  84          * FIXME: implement proper interrupt disable by using the vblank
  85          * counter register (if available)
  86          *
  87          * R128_WRITE(R128_GEN_INT_CNTL,
  88          *            R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
  89          */
  90 }
  91
  92 void r128_driver_irq_preinstall(struct drm_device *dev)
  93 {
  94         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  95
  96         /* Disable *all* interrupts */
  97         R128_WRITE(R128_GEN_INT_CNTL, 0);
  98         /* Clear vblank bit if it's already high */
  99         R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
 100 }
 101
 102 int r128_driver_irq_postinstall(struct drm_device *dev)
 103 {
 104         return 0;
 105 }
 106
 107 void r128_driver_irq_uninstall(struct drm_device *dev)
 108 {
 109         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
 110         if (!dev_priv)
 111                 return;
 112
 113         /* Disable *all* interrupts */
 114         R128_WRITE(R128_GEN_INT_CNTL, 0);
 115 }