sys/dev/drm/mach64_irq.c

   1 /* mach64_irq.c -- IRQ handling for ATI Mach64 -*- linux-c -*-
   2  * Created: Tue Feb 25, 2003 by Leif Delgass, based on radeon_irq.c/r128_irq.c
   3  */
   4 /*-
   5  * Copyright (C) The Weather Channel, Inc.  2002.
   6  * Copyright 2003 Leif Delgass
   7  * All Rights Reserved.
   8  *
   9  * The Weather Channel (TM) funded Tungsten Graphics to develop the
  10  * initial release of the Radeon 8500 driver under the XFree86 license.
  11  * This notice must be preserved.
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a
  14  * copy of this software and associated documentation files (the "Software"),
  15  * to deal in the Software without restriction, including without limitation
  16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  17  * and/or sell copies of the Software, and to permit persons to whom the
  18  * Software is furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice (including the next
  21  * paragraph) shall be included in all copies or substantial portions of the
  22  * Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  27  * THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  28  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  29  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  30  * DEALINGS IN THE SOFTWARE.
  31  *
  32  * Authors:
  33  *    Keith Whitwell <keith@tungstengraphics.com>
  34  *    Eric Anholt <anholt@FreeBSD.org>
  35  *    Leif Delgass <ldelgass@retinalburn.net>
  36  */
  37
  38 #include "dev/drm/drmP.h"
  39 #include "dev/drm/drm.h"
  40 #include "dev/drm/mach64_drm.h"
  41 #include "dev/drm/mach64_drv.h"
  42
  43 irqreturn_t mach64_driver_irq_handler(DRM_IRQ_ARGS)
  44 {
  45         struct drm_device *dev = arg;
  46         drm_mach64_private_t *dev_priv = dev->dev_private;
  47         int status;
  48
  49         status = MACH64_READ(MACH64_CRTC_INT_CNTL);
  50
  51         /* VBLANK interrupt */
  52         if (status & MACH64_CRTC_VBLANK_INT) {
  53                 /* Mask off all interrupt ack bits before setting the ack bit, since
  54                  * there may be other handlers outside the DRM.
  55                  *
  56                  * NOTE: On mach64, you need to keep the enable bits set when doing
  57                  * the ack, despite what the docs say about not acking and enabling
  58                  * in a single write.
  59                  */
  60                 MACH64_WRITE(MACH64_CRTC_INT_CNTL,
  61                              (status & ~MACH64_CRTC_INT_ACKS)
  62                              | MACH64_CRTC_VBLANK_INT);
  63
  64                 atomic_inc(&dev_priv->vbl_received);
  65                 drm_handle_vblank(dev, 0);
  66                 return IRQ_HANDLED;
  67         }
  68         return IRQ_NONE;
  69 }
  70
  71 u32 mach64_get_vblank_counter(struct drm_device * dev, int crtc)
  72 {
  73         const drm_mach64_private_t *const dev_priv = dev->dev_private;
  74
  75         if (crtc != 0)
  76                 return 0;
  77
  78         return atomic_read(&dev_priv->vbl_received);
  79 }
  80
  81 int mach64_enable_vblank(struct drm_device * dev, int crtc)
  82 {
  83         drm_mach64_private_t *dev_priv = dev->dev_private;
  84         u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
  85
  86         if (crtc != 0) {
  87                 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
  88                           crtc);
  89                 return -EINVAL;
  90         }
  91
  92         DRM_DEBUG("before enable vblank CRTC_INT_CTNL: 0x%08x\n", status);
  93
  94         /* Turn on VBLANK interrupt */
  95         MACH64_WRITE(MACH64_CRTC_INT_CNTL, MACH64_READ(MACH64_CRTC_INT_CNTL)
  96                      | MACH64_CRTC_VBLANK_INT_EN);
  97
  98         return 0;
  99 }
 100
 101 void mach64_disable_vblank(struct drm_device * dev, int crtc)
 102 {
 103         if (crtc != 0) {
 104                 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
 105                           crtc);
 106                 return;
 107         }
 108
 109         /*
 110          * FIXME: implement proper interrupt disable by using the vblank
 111          * counter register (if available).
 112          */
 113 }
 114
 115 static void mach64_disable_vblank_local(struct drm_device * dev, int crtc)
 116 {
 117         drm_mach64_private_t *dev_priv = dev->dev_private;
 118         u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
 119
 120         if (crtc != 0) {
 121                 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
 122                           crtc);
 123                 return;
 124         }
 125
 126         DRM_DEBUG("before disable vblank CRTC_INT_CTNL: 0x%08x\n", status);
 127
 128         /* Disable and clear VBLANK interrupt */
 129         MACH64_WRITE(MACH64_CRTC_INT_CNTL, (status & ~MACH64_CRTC_VBLANK_INT_EN)
 130                      | MACH64_CRTC_VBLANK_INT);
 131 }
 132
 133 void mach64_driver_irq_preinstall(struct drm_device * dev)
 134 {
 135         drm_mach64_private_t *dev_priv = dev->dev_private;
 136
 137         u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
 138
 139         DRM_DEBUG("before install CRTC_INT_CTNL: 0x%08x\n", status);
 140
 141         mach64_disable_vblank_local(dev, 0);
 142 }
 143
 144 int mach64_driver_irq_postinstall(struct drm_device * dev)
 145 {
 146         return 0;
 147 }
 148
 149 void mach64_driver_irq_uninstall(struct drm_device * dev)
 150 {
 151         drm_mach64_private_t *dev_priv = dev->dev_private;
 152         if (!dev_priv)
 153                 return;
 154
 155         mach64_disable_vblank_local(dev, 0);
 156
 157         DRM_DEBUG("after uninstall CRTC_INT_CTNL: 0x%08x\n",
 158                   MACH64_READ(MACH64_CRTC_INT_CNTL));
 159 }