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
nouveau_irq_preinstall(struct drm_device * dev)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
nouveau_irq_postinstall(struct drm_device * dev)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
nouveau_irq_uninstall(struct drm_device * dev)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
nouveau_irq_handler(DRM_IRQ_ARGS)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
nouveau_irq_init(struct drm_device * dev)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
nouveau_irq_fini(struct drm_device * dev)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
nouveau_irq_register(struct drm_device * dev,int status_bit,void (* handler)(struct drm_device *))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
nouveau_irq_unregister(struct drm_device * dev,int status_bit)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 }
152