1/*
  2 * Copyright 2011 Red Hat Inc.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 *
 22 * Authors: Ben Skeggs
 23 */
 24
 25#include "drmP.h"
 26#include "drm.h"
 27#include "nouveau_drv.h"
 28#include "nouveau_drm.h"
 29
 30struct nvc0_fb_priv {
 31	struct page *r100c10_page;
 32	dma_addr_t r100c10;
 33};
 34
 35static void
 36nvc0_fb_destroy(struct drm_device *dev)
 37{
 38	struct drm_nouveau_private *dev_priv = dev->dev_private;
 39	struct nouveau_fb_engine *pfb = &dev_priv->engine.fb;
 40	struct nvc0_fb_priv *priv = pfb->priv;
 41
 42	if (priv->r100c10_page) {
 43		pci_unmap_page(dev->pdev, priv->r100c10, PAGE_SIZE,
 44			       PCI_DMA_BIDIRECTIONAL);
 45		__free_page(priv->r100c10_page);
 46	}
 47
 48	kfree(priv);
 49	pfb->priv = NULL;
 50}
 51
 52static int
 53nvc0_fb_create(struct drm_device *dev)
 54{
 55	struct drm_nouveau_private *dev_priv = dev->dev_private;
 56	struct nouveau_fb_engine *pfb = &dev_priv->engine.fb;
 57	struct nvc0_fb_priv *priv;
 58
 59	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 60	if (!priv)
 61		return -ENOMEM;
 62	pfb->priv = priv;
 63
 64	priv->r100c10_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 65	if (!priv->r100c10_page) {
 66		nvc0_fb_destroy(dev);
 67		return -ENOMEM;
 68	}
 69
 70	priv->r100c10 = pci_map_page(dev->pdev, priv->r100c10_page, 0,
 71				     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 72	if (pci_dma_mapping_error(dev->pdev, priv->r100c10)) {
 73		nvc0_fb_destroy(dev);
 74		return -EFAULT;
 75	}
 76
 77	return 0;
 78}
 79
 80int
 81nvc0_fb_init(struct drm_device *dev)
 82{
 83	struct drm_nouveau_private *dev_priv = dev->dev_private;
 84	struct nvc0_fb_priv *priv;
 85	int ret;
 86
 87	if (!dev_priv->engine.fb.priv) {
 88		ret = nvc0_fb_create(dev);
 89		if (ret)
 90			return ret;
 91	}
 92	priv = dev_priv->engine.fb.priv;
 93
 94	nv_wr32(dev, 0x100c10, priv->r100c10 >> 8);
 95	return 0;
 96}
 97
 98void
 99nvc0_fb_takedown(struct drm_device *dev)
100{
101	nvc0_fb_destroy(dev);
102}