drivers/gpu/drm/nouveau/nouveau_irq.c

   1 /*
   2  * Copyright (C) 2006 Ben Skeggs.
   3  *
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sublicense, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial
  16  * portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  */
  27
  28 /*
  29  * Authors:
  30  *   Ben Skeggs <darktama@iinet.net.au>
  31  */
  32
  33 #include "drmP.h"
  34 #include "drm.h"
  35 #include "nouveau_drm.h"
  36 #include "nouveau_drv.h"
  37 #include "nouveau_reg.h"
  38 #include "nouveau_ramht.h"
  39 #include "nouveau_util.h"
  40
  41 void
  42 nouveau_irq_preinstall(struct drm_device *dev)
  43 {
  44         struct drm_nouveau_private *dev_priv = dev->dev_private;
  45
  46         /* Master disable */
  47         nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
  48
  49         INIT_LIST_HEAD(&dev_priv->vbl_waiting);
  50 }
  51
  52 int
  53 nouveau_irq_postinstall(struct drm_device *dev)
  54 {
  55         struct drm_nouveau_private *dev_priv = dev->dev_private;
  56
  57         /* Master enable */
  58         nv_wr32(dev, NV03_PMC_INTR_EN_0, NV_PMC_INTR_EN_0_MASTER_ENABLE);
  59         if (dev_priv->msi_enabled)
  60                 nv_wr08(dev, 0x00088068, 0xff);
  61
  62         return 0;
  63 }
  64
  65 void
  66 nouveau_irq_uninstall(struct drm_device *dev)
  67 {
  68         /* Master disable */
  69         nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
  70 }
  71
  72 irqreturn_t
  73 nouveau_irq_handler(DRM_IRQ_ARGS)
  74 {
  75         struct drm_device *dev = (struct drm_device *)arg;
  76         struct drm_nouveau_private *dev_priv = dev->dev_private;
  77         unsigned long flags;
  78         u32 stat;
  79         int i;
  80
  81         stat = nv_rd32(dev, NV03_PMC_INTR_0);
  82         if (stat == 0 || stat == ~0)
  83                 return IRQ_NONE;
  84
  85         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
  86         for (i = 0; i < 32 && stat; i++) {
  87                 if (!(stat & (1 << i)) || !dev_priv->irq_handler[i])
  88                         continue;
  89
  90                 dev_priv->irq_handler[i](dev);
  91                 stat &= ~(1 << i);
  92         }
  93
  94         if (dev_priv->msi_enabled)
  95                 nv_wr08(dev, 0x00088068, 0xff);
  96         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
  97
  98         if (stat && nouveau_ratelimit())
  99                 NV_ERROR(dev, "PMC - unhandled INTR 0x%08x\n", stat);
 100         return IRQ_HANDLED;
 101 }
 102
 103 int
 104 nouveau_irq_init(struct drm_device *dev)
 105 {
 106         struct drm_nouveau_private *dev_priv = dev->dev_private;
 107         int ret;
 108
 109         if (nouveau_msi != 0 && dev_priv->card_type >= NV_50) {
 110                 ret = pci_enable_msi(dev->pdev);
 111                 if (ret == 0) {
 112                         NV_INFO(dev, "enabled MSI\n");
 113                         dev_priv->msi_enabled = true;
 114                 }
 115         }
 116
 117         return drm_irq_install(dev);
 118 }
 119
 120 void
 121 nouveau_irq_fini(struct drm_device *dev)
 122 {
 123         struct drm_nouveau_private *dev_priv = dev->dev_private;
 124
 125         drm_irq_uninstall(dev);
 126         if (dev_priv->msi_enabled)
 127                 pci_disable_msi(dev->pdev);
 128 }
 129
 130 void
 131 nouveau_irq_register(struct drm_device *dev, int status_bit,
 132                      void (*handler)(struct drm_device *))
 133 {
 134         struct drm_nouveau_private *dev_priv = dev->dev_private;
 135         unsigned long flags;
 136
 137         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 138         dev_priv->irq_handler[status_bit] = handler;
 139         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 140 }
 141
 142 void
 143 nouveau_irq_unregister(struct drm_device *dev, int status_bit)
 144 {
 145         struct drm_nouveau_private *dev_priv = dev->dev_private;
 146         unsigned long flags;
 147
 148         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 149         dev_priv->irq_handler[status_bit] = NULL;
 150         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 151 }