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 <drm/drmP.h>
  34#include <drm/r128_drm.h>
  35#include "r128_drv.h"
  36
  37u32 r128_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
  38{
  39        const drm_r128_private_t *dev_priv = dev->dev_private;
  40
  41        if (pipe != 0)
  42                return 0;
  43
  44        return atomic_read(&dev_priv->vbl_received);
  45}
  46
  47irqreturn_t r128_driver_irq_handler(int irq, void *arg)
  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
  65int r128_enable_vblank(struct drm_device *dev, unsigned int pipe)
  66{
  67        drm_r128_private_t *dev_priv = dev->dev_private;
  68
  69        if (pipe != 0) {
  70                DRM_ERROR("%s:  bad crtc %u\n", __func__, pipe);
  71                return -EINVAL;
  72        }
  73
  74        R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
  75        return 0;
  76}
  77
  78void r128_disable_vblank(struct drm_device *dev, unsigned int pipe)
  79{
  80        if (pipe != 0)
  81                DRM_ERROR("%s:  bad crtc %u\n", __func__, pipe);
  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
  92void 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
 102int r128_driver_irq_postinstall(struct drm_device *dev)
 103{
 104        return 0;
 105}
 106
 107void 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}
 116