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	/* Master disable */
 45	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
 46}
 47
 48int
 49nouveau_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
 61void
 62nouveau_irq_uninstall(struct drm_device *dev)
 63{
 64	/* Master disable */
 65	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
 66}
 67
 68irqreturn_t
 69nouveau_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
 99int
100nouveau_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
116void
117nouveau_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
126void
127nouveau_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
138void
139nouveau_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}