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 inline void
 36nvc0_mfb_subp_isr(struct drm_device *dev, int unit, int subp)
 37{
 38	u32 subp_base = 0x141000 + (unit * 0x2000) + (subp * 0x400);
 39	u32 stat = nv_rd32(dev, subp_base + 0x020);
 40
 41	if (stat) {
 42		NV_INFO(dev, "PMFB%d_SUBP%d: 0x%08x\n", unit, subp, stat);
 43		nv_wr32(dev, subp_base + 0x020, stat);
 44	}
 45}
 46
 47static void
 48nvc0_mfb_isr(struct drm_device *dev)
 49{
 50	u32 units = nv_rd32(dev, 0x00017c);
 51	while (units) {
 52		u32 subp, unit = ffs(units) - 1;
 53		for (subp = 0; subp < 2; subp++)
 54			nvc0_mfb_subp_isr(dev, unit, subp);
 55		units &= ~(1 << unit);
 56	}
 57
 58	/* we do something horribly wrong and upset PMFB a lot, so mask off
 59	 * interrupts from it after the first one until it's fixed
 60	 */
 61	nv_mask(dev, 0x000640, 0x02000000, 0x00000000);
 62}
 63
 64static void
 65nvc0_fb_destroy(struct drm_device *dev)
 66{
 67	struct drm_nouveau_private *dev_priv = dev->dev_private;
 68	struct nouveau_fb_engine *pfb = &dev_priv->engine.fb;
 69	struct nvc0_fb_priv *priv = pfb->priv;
 70
 71	nouveau_irq_unregister(dev, 25);
 72
 73	if (priv->r100c10_page) {
 74		pci_unmap_page(dev->pdev, priv->r100c10, PAGE_SIZE,
 75			       PCI_DMA_BIDIRECTIONAL);
 76		__free_page(priv->r100c10_page);
 77	}
 78
 79	kfree(priv);
 80	pfb->priv = NULL;
 81}
 82
 83static int
 84nvc0_fb_create(struct drm_device *dev)
 85{
 86	struct drm_nouveau_private *dev_priv = dev->dev_private;
 87	struct nouveau_fb_engine *pfb = &dev_priv->engine.fb;
 88	struct nvc0_fb_priv *priv;
 89
 90	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 91	if (!priv)
 92		return -ENOMEM;
 93	pfb->priv = priv;
 94
 95	priv->r100c10_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 96	if (!priv->r100c10_page) {
 97		nvc0_fb_destroy(dev);
 98		return -ENOMEM;
 99	}
100
101	priv->r100c10 = pci_map_page(dev->pdev, priv->r100c10_page, 0,
102				     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
103	if (pci_dma_mapping_error(dev->pdev, priv->r100c10)) {
104		nvc0_fb_destroy(dev);
105		return -EFAULT;
106	}
107
108	nouveau_irq_register(dev, 25, nvc0_mfb_isr);
109	return 0;
110}
111
112int
113nvc0_fb_init(struct drm_device *dev)
114{
115	struct drm_nouveau_private *dev_priv = dev->dev_private;
116	struct nvc0_fb_priv *priv;
117	int ret;
118
119	if (!dev_priv->engine.fb.priv) {
120		ret = nvc0_fb_create(dev);
121		if (ret)
122			return ret;
123	}
124	priv = dev_priv->engine.fb.priv;
125
126	nv_wr32(dev, 0x100c10, priv->r100c10 >> 8);
127	return 0;
128}
129
130void
131nvc0_fb_takedown(struct drm_device *dev)
132{
133	nvc0_fb_destroy(dev);
134}