/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#include <subdev/fb.h>
#include <subdev/ltcg.h>
#include <subdev/bios.h>

struct nvc0_fb_priv {
	struct nouveau_fb base;
	struct page *r100c10_page;
	dma_addr_t r100c10;
};

extern const u8 nvc0_pte_storage_type_map[256];


static bool
nvc0_fb_memtype_valid(struct nouveau_fb *pfb, u32 tile_flags)
{
	u8 memtype = (tile_flags & 0x0000ff00) >> 8;
	return likely((nvc0_pte_storage_type_map[memtype] != 0xff));
}

static int
nvc0_fb_vram_init(struct nouveau_fb *pfb)
{
	struct nouveau_bios *bios = nouveau_bios(pfb);
	const u32 rsvd_head = ( 256 * 1024) >> 12; /* vga memory */
	const u32 rsvd_tail = (1024 * 1024) >> 12; /* vbios etc */
	u32 parts = nv_rd32(pfb, 0x022438);
	u32 pmask = nv_rd32(pfb, 0x022554);
	u32 bsize = nv_rd32(pfb, 0x10f20c);
	u32 offset, length;
	bool uniform = true;
	int ret, part;

	nv_debug(pfb, "0x100800: 0x%08x\n", nv_rd32(pfb, 0x100800));
	nv_debug(pfb, "parts 0x%08x mask 0x%08x\n", parts, pmask);

	pfb->ram.type = nouveau_fb_bios_memtype(bios);
	pfb->ram.ranks = (nv_rd32(pfb, 0x10f200) & 0x00000004) ? 2 : 1;

	/* read amount of vram attached to each memory controller */
	for (part = 0; part < parts; part++) {
		if (!(pmask & (1 << part))) {
			u32 psize = nv_rd32(pfb, 0x11020c + (part * 0x1000));
			if (psize != bsize) {
				if (psize < bsize)
					bsize = psize;
				uniform = false;
			}

			nv_debug(pfb, "%d: mem_amount 0x%08x\n", part, psize);
			pfb->ram.size += (u64)psize << 20;
		}
	}

	/* if all controllers have the same amount attached, there's no holes */
	if (uniform) {
		offset = rsvd_head;
		length = (pfb->ram.size >> 12) - rsvd_head - rsvd_tail;
		return nouveau_mm_init(&pfb->vram, offset, length, 1);
	}

	/* otherwise, address lowest common amount from 0GiB */
	ret = nouveau_mm_init(&pfb->vram, rsvd_head, (bsize << 8) * parts, 1);
	if (ret)
		return ret;

	/* and the rest starting from (8GiB + common_size) */
	offset = (0x0200000000ULL >> 12) + (bsize << 8);
	length = (pfb->ram.size >> 12) - (bsize << 8) - rsvd_tail;

	ret = nouveau_mm_init(&pfb->vram, offset, length, 0);
	if (ret) {
		nouveau_mm_fini(&pfb->vram);
		return ret;
	}

	return 0;
}

static int
nvc0_fb_vram_new(struct nouveau_fb *pfb, u64 size, u32 align, u32 ncmin,
		 u32 memtype, struct nouveau_mem **pmem)
{
	struct nouveau_mm *mm = &pfb->vram;
	struct nouveau_mm_node *r;
	struct nouveau_mem *mem;
	int type = (memtype & 0x0ff);
	int back = (memtype & 0x800);
	int ret;
	const bool comp = nvc0_pte_storage_type_map[type] != type;

	size  >>= 12;
	align >>= 12;
	ncmin >>= 12;
	if (!ncmin)
		ncmin = size;

	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
	if (!mem)
		return -ENOMEM;

	INIT_LIST_HEAD(&mem->regions);
	mem->size = size;

	mutex_lock(&pfb->base.mutex);
	if (comp) {
		struct nouveau_ltcg *ltcg = nouveau_ltcg(pfb->base.base.parent);

		/* compression only works with lpages */
		if (align == (1 << (17 - 12))) {
			int n = size >> 5;
			ltcg->tags_alloc(ltcg, n, &mem->tag);
		}
		if (unlikely(!mem->tag))
			type = nvc0_pte_storage_type_map[type];
	}
	mem->memtype = type;

	do {
		if (back)
			ret = nouveau_mm_tail(mm, 1, size, ncmin, align, &r);
		else
			ret = nouveau_mm_head(mm, 1, size, ncmin, align, &r);
		if (ret) {
			mutex_unlock(&pfb->base.mutex);
			pfb->ram.put(pfb, &mem);
			return ret;
		}

		list_add_tail(&r->rl_entry, &mem->regions);
		size -= r->length;
	} while (size);
	mutex_unlock(&pfb->base.mutex);

	r = list_first_entry(&mem->regions, struct nouveau_mm_node, rl_entry);
	mem->offset = (u64)r->offset << 12;
	*pmem = mem;
	return 0;
}

static void
nvc0_fb_vram_del(struct nouveau_fb *pfb, struct nouveau_mem **pmem)
{
	struct nouveau_ltcg *ltcg = nouveau_ltcg(pfb->base.base.parent);

	if ((*pmem)->tag)
		ltcg->tags_free(ltcg, &(*pmem)->tag);

	nv50_fb_vram_del(pfb, pmem);
}

static int
nvc0_fb_init(struct nouveau_object *object)
{
	struct nvc0_fb_priv *priv = (void *)object;
	int ret;

	ret = nouveau_fb_init(&priv->base);
	if (ret)
		return ret;

	if (priv->r100c10_page)
		nv_wr32(priv, 0x100c10, priv->r100c10 >> 8);
	return 0;
}

static void
nvc0_fb_dtor(struct nouveau_object *object)
{
	struct nouveau_device *device = nv_device(object);
	struct nvc0_fb_priv *priv = (void *)object;

	if (priv->r100c10_page) {
		pci_unmap_page(device->pdev, priv->r100c10, PAGE_SIZE,
			       PCI_DMA_BIDIRECTIONAL);
		__free_page(priv->r100c10_page);
	}

	nouveau_fb_destroy(&priv->base);
}

static int
nvc0_fb_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
	     struct nouveau_oclass *oclass, void *data, u32 size,
	     struct nouveau_object **pobject)
{
	struct nouveau_device *device = nv_device(parent);
	struct nvc0_fb_priv *priv;
	int ret;

	ret = nouveau_fb_create(parent, engine, oclass, &priv);
	*pobject = nv_object(priv);
	if (ret)
		return ret;

	priv->base.memtype_valid = nvc0_fb_memtype_valid;
	priv->base.ram.init = nvc0_fb_vram_init;
	priv->base.ram.get = nvc0_fb_vram_new;
	priv->base.ram.put = nvc0_fb_vram_del;

	priv->r100c10_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
	if (priv->r100c10_page) {
		priv->r100c10 = pci_map_page(device->pdev, priv->r100c10_page,
					     0, PAGE_SIZE,
					     PCI_DMA_BIDIRECTIONAL);
		if (pci_dma_mapping_error(device->pdev, priv->r100c10))
			return -EFAULT;
	}

	return nouveau_fb_preinit(&priv->base);
}


struct nouveau_oclass
nvc0_fb_oclass = {
	.handle = NV_SUBDEV(FB, 0xc0),
	.ofuncs = &(struct nouveau_ofuncs) {
		.ctor = nvc0_fb_ctor,
		.dtor = nvc0_fb_dtor,
		.init = nvc0_fb_init,
		.fini = _nouveau_fb_fini,
	},
};