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
 41void
 42nouveau_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
 52int
 53nouveau_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
 65void
 66nouveau_irq_uninstall(struct drm_device *dev)
 67{
 68	/* Master disable */
 69	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
 70}
 71
 72irqreturn_t
 73nouveau_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
103int
104nouveau_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
120void
121nouveau_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
130void
131nouveau_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
142void
143nouveau_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}