LXR linux/drivers/gpu/drm/r128/r128

   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
  38u32 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
  48irqreturn_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
  66int 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
  79void 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
  93void 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
 103int r128_driver_irq_postinstall(struct drm_device *dev)
 104{
 105        return 0;
 106}
 107
 108void 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}
 117