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 <drm/drmP.h>
  34 #include <drm/nouveau_drm.h>
  35 #include "nouveau_drv.h"
  36 #include "nouveau_reg.h"
  37 #include "nouveau_ramht.h"
  38 #include "nouveau_util.h"
  39
  40 void
  41 nouveau_irq_preinstall(struct drm_device *dev)
  42 {
  43         /* Master disable */
  44         nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
  45 }
  46
  47 int
  48 nouveau_irq_postinstall(struct drm_device *dev)
  49 {
  50         struct drm_nouveau_private *dev_priv = dev->dev_private;
  51
  52         /* Master enable */
  53         nv_wr32(dev, NV03_PMC_INTR_EN_0, NV_PMC_INTR_EN_0_MASTER_ENABLE);
  54         if (dev_priv->msi_enabled)
  55                 nv_wr08(dev, 0x00088068, 0xff);
  56
  57         return 0;
  58 }
  59
  60 void
  61 nouveau_irq_uninstall(struct drm_device *dev)
  62 {
  63         /* Master disable */
  64         nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
  65 }
  66
  67 irqreturn_t
  68 nouveau_irq_handler(DRM_IRQ_ARGS)
  69 {
  70         struct drm_device *dev = (struct drm_device *)arg;
  71         struct drm_nouveau_private *dev_priv = dev->dev_private;
  72         unsigned long flags;
  73         u32 stat;
  74         int i;
  75
  76         stat = nv_rd32(dev, NV03_PMC_INTR_0);
  77         if (stat == 0 || stat == ~0)
  78                 return IRQ_NONE;
  79
  80         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
  81         for (i = 0; i < 32 && stat; i++) {
  82                 if (!(stat & (1 << i)) || !dev_priv->irq_handler[i])
  83                         continue;
  84
  85                 dev_priv->irq_handler[i](dev);
  86                 stat &= ~(1 << i);
  87         }
  88
  89         if (dev_priv->msi_enabled)
  90                 nv_wr08(dev, 0x00088068, 0xff);
  91         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
  92
  93         if (stat && nouveau_ratelimit())
  94                 NV_ERROR(dev, "PMC - unhandled INTR 0x%08x\n", stat);
  95         return IRQ_HANDLED;
  96 }
  97
  98 int
  99 nouveau_irq_init(struct drm_device *dev)
 100 {
 101         struct drm_nouveau_private *dev_priv = dev->dev_private;
 102         int ret;
 103
 104         if (nouveau_msi != 0 && dev_priv->card_type >= NV_50) {
 105                 ret = pci_enable_msi(dev->pdev);
 106                 if (ret == 0) {
 107                         NV_INFO(dev, "enabled MSI\n");
 108                         dev_priv->msi_enabled = true;
 109                 }
 110         }
 111
 112         return drm_irq_install(dev);
 113 }
 114
 115 void
 116 nouveau_irq_fini(struct drm_device *dev)
 117 {
 118         struct drm_nouveau_private *dev_priv = dev->dev_private;
 119
 120         drm_irq_uninstall(dev);
 121         if (dev_priv->msi_enabled)
 122                 pci_disable_msi(dev->pdev);
 123 }
 124
 125 void
 126 nouveau_irq_register(struct drm_device *dev, int status_bit,
 127                      void (*handler)(struct drm_device *))
 128 {
 129         struct drm_nouveau_private *dev_priv = dev->dev_private;
 130         unsigned long flags;
 131
 132         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 133         dev_priv->irq_handler[status_bit] = handler;
 134         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 135 }
 136
 137 void
 138 nouveau_irq_unregister(struct drm_device *dev, int status_bit)
 139 {
 140         struct drm_nouveau_private *dev_priv = dev->dev_private;
 141         unsigned long flags;
 142
 143         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 144         dev_priv->irq_handler[status_bit] = NULL;
 145         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 146 }