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         /* Master disable */
  45         nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
  46 }
  47
  48 int
  49 nouveau_irq_postinstall(struct drm_device *dev)
  50 {
  51         struct drm_nouveau_private *dev_priv = dev->dev_private;
  52
  53         /* Master enable */
  54         nv_wr32(dev, NV03_PMC_INTR_EN_0, NV_PMC_INTR_EN_0_MASTER_ENABLE);
  55         if (dev_priv->msi_enabled)
  56                 nv_wr08(dev, 0x00088068, 0xff);
  57
  58         return 0;
  59 }
  60
  61 void
  62 nouveau_irq_uninstall(struct drm_device *dev)
  63 {
  64         /* Master disable */
  65         nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
  66 }
  67
  68 irqreturn_t
  69 nouveau_irq_handler(DRM_IRQ_ARGS)
  70 {
  71         struct drm_device *dev = (struct drm_device *)arg;
  72         struct drm_nouveau_private *dev_priv = dev->dev_private;
  73         unsigned long flags;
  74         u32 stat;
  75         int i;
  76
  77         stat = nv_rd32(dev, NV03_PMC_INTR_0);
  78         if (stat == 0 || stat == ~0)
  79                 return IRQ_NONE;
  80
  81         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
  82         for (i = 0; i < 32 && stat; i++) {
  83                 if (!(stat & (1 << i)) || !dev_priv->irq_handler[i])
  84                         continue;
  85
  86                 dev_priv->irq_handler[i](dev);
  87                 stat &= ~(1 << i);
  88         }
  89
  90         if (dev_priv->msi_enabled)
  91                 nv_wr08(dev, 0x00088068, 0xff);
  92         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
  93
  94         if (stat && nouveau_ratelimit())
  95                 NV_ERROR(dev, "PMC - unhandled INTR 0x%08x\n", stat);
  96         return IRQ_HANDLED;
  97 }
  98
  99 int
 100 nouveau_irq_init(struct drm_device *dev)
 101 {
 102         struct drm_nouveau_private *dev_priv = dev->dev_private;
 103         int ret;
 104
 105         if (nouveau_msi != 0 && dev_priv->card_type >= NV_50) {
 106                 ret = pci_enable_msi(dev->pdev);
 107                 if (ret == 0) {
 108                         NV_INFO(dev, "enabled MSI\n");
 109                         dev_priv->msi_enabled = true;
 110                 }
 111         }
 112
 113         return drm_irq_install(dev);
 114 }
 115
 116 void
 117 nouveau_irq_fini(struct drm_device *dev)
 118 {
 119         struct drm_nouveau_private *dev_priv = dev->dev_private;
 120
 121         drm_irq_uninstall(dev);
 122         if (dev_priv->msi_enabled)
 123                 pci_disable_msi(dev->pdev);
 124 }
 125
 126 void
 127 nouveau_irq_register(struct drm_device *dev, int status_bit,
 128                      void (*handler)(struct drm_device *))
 129 {
 130         struct drm_nouveau_private *dev_priv = dev->dev_private;
 131         unsigned long flags;
 132
 133         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 134         dev_priv->irq_handler[status_bit] = handler;
 135         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 136 }
 137
 138 void
 139 nouveau_irq_unregister(struct drm_device *dev, int status_bit)
 140 {
 141         struct drm_nouveau_private *dev_priv = dev->dev_private;
 142         unsigned long flags;
 143
 144         spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 145         dev_priv->irq_handler[status_bit] = NULL;
 146         spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 147 }