drivers/char/drm/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 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
  39 {
  40         struct drm_device *dev = (struct drm_device *) arg;
  41         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  42         int status;
  43
  44         status = R128_READ(R128_GEN_INT_STATUS);
  45
  46         /* VBLANK interrupt */
  47         if (status & R128_CRTC_VBLANK_INT) {
  48                 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
  49                 atomic_inc(&dev->vbl_received);
  50                 DRM_WAKEUP(&dev->vbl_queue);
  51                 drm_vbl_send_signals(dev);
  52                 return IRQ_HANDLED;
  53         }
  54         return IRQ_NONE;
  55 }
  56
  57 int r128_driver_vblank_wait(struct drm_device * dev, unsigned int *sequence)
  58 {
  59         unsigned int cur_vblank;
  60         int ret = 0;
  61
  62         /* Assume that the user has missed the current sequence number
  63          * by about a day rather than she wants to wait for years
  64          * using vertical blanks...
  65          */
  66         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
  67                     (((cur_vblank = atomic_read(&dev->vbl_received))
  68                       - *sequence) <= (1 << 23)));
  69
  70         *sequence = cur_vblank;
  71
  72         return ret;
  73 }
  74
  75 void r128_driver_irq_preinstall(struct drm_device * dev)
  76 {
  77         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  78
  79         /* Disable *all* interrupts */
  80         R128_WRITE(R128_GEN_INT_CNTL, 0);
  81         /* Clear vblank bit if it's already high */
  82         R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
  83 }
  84
  85 void r128_driver_irq_postinstall(struct drm_device * dev)
  86 {
  87         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  88
  89         /* Turn on VBL interrupt */
  90         R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
  91 }
  92
  93 void r128_driver_irq_uninstall(struct drm_device * dev)
  94 {
  95         drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
  96         if (!dev_priv)
  97                 return;
  98
  99         /* Disable *all* interrupts */
 100         R128_WRITE(R128_GEN_INT_CNTL, 0);
 101 }