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/*
* 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/ltcg.h>
#include <subdev/fb.h>
#include <subdev/timer.h>
struct nvc0_ltcg_priv {
struct nouveau_ltcg base;
u32 part_nr;
u32 part_mask;
u32 subp_nr;
struct nouveau_mm tags;
u32 num_tags;
struct nouveau_mm_node *tag_ram;
};
static void
nvc0_ltcg_subp_isr(struct nvc0_ltcg_priv *priv, int unit, int subp)
{
u32 subp_base = 0x141000 + (unit * 0x2000) + (subp * 0x400);
u32 stat = nv_rd32(priv, subp_base + 0x020);
if (stat) {
nv_info(priv, "LTC%d_LTS%d: 0x%08x\n", unit, subp, stat);
nv_wr32(priv, subp_base + 0x020, stat);
}
}
static void
nvc0_ltcg_intr(struct nouveau_subdev *subdev)
{
struct nvc0_ltcg_priv *priv = (void *)subdev;
u32 units;
units = nv_rd32(priv, 0x00017c);
while (units) {
u32 subp, unit = ffs(units) - 1;
for (subp = 0; subp < priv->subp_nr; subp++)
nvc0_ltcg_subp_isr(priv, unit, subp);
units &= ~(1 << unit);
}
/* we do something horribly wrong and upset PMFB a lot, so mask off
* interrupts from it after the first one until it's fixed
*/
nv_mask(priv, 0x000640, 0x02000000, 0x00000000);
}
static int
nvc0_ltcg_tags_alloc(struct nouveau_ltcg *ltcg, u32 n,
struct nouveau_mm_node **pnode)
{
struct nvc0_ltcg_priv *priv = (struct nvc0_ltcg_priv *)ltcg;
int ret;
ret = nouveau_mm_head(&priv->tags, 1, n, n, 1, pnode);
if (ret)
*pnode = NULL;
return ret;
}
static void
nvc0_ltcg_tags_free(struct nouveau_ltcg *ltcg, struct nouveau_mm_node **pnode)
{
struct nvc0_ltcg_priv *priv = (struct nvc0_ltcg_priv *)ltcg;
nouveau_mm_free(&priv->tags, pnode);
}
static void
nvc0_ltcg_tags_clear(struct nouveau_ltcg *ltcg, u32 first, u32 count)
{
struct nvc0_ltcg_priv *priv = (struct nvc0_ltcg_priv *)ltcg;
u32 last = first + count - 1;
int p, i;
BUG_ON((first > last) || (last >= priv->num_tags));
nv_wr32(priv, 0x17e8cc, first);
nv_wr32(priv, 0x17e8d0, last);
nv_wr32(priv, 0x17e8c8, 0x4); /* trigger clear */
/* wait until it's finished with clearing */
for (p = 0; p < priv->part_nr; ++p) {
if (!(priv->part_mask & (1 << p)))
continue;
for (i = 0; i < priv->subp_nr; ++i)
nv_wait(priv, 0x1410c8 + p * 0x2000 + i * 0x400, ~0, 0);
}
}
/* TODO: Figure out tag memory details and drop the over-cautious allocation.
*/
static int
nvc0_ltcg_init_tag_ram(struct nouveau_fb *pfb, struct nvc0_ltcg_priv *priv)
{
u32 tag_size, tag_margin, tag_align;
int ret;
nv_wr32(priv, 0x17e8d8, priv->part_nr);
/* tags for 1/4 of VRAM should be enough (8192/4 per GiB of VRAM) */
priv->num_tags = (pfb->ram.size >> 17) / 4;
if (priv->num_tags > (1 << 17))
priv->num_tags = 1 << 17; /* we have 17 bits in PTE */
priv->num_tags = (priv->num_tags + 63) & ~63; /* round up to 64 */
tag_align = priv->part_nr * 0x800;
tag_margin = (tag_align < 0x6000) ? 0x6000 : tag_align;
/* 4 part 4 sub: 0x2000 bytes for 56 tags */
/* 3 part 4 sub: 0x6000 bytes for 168 tags */
/*
* About 147 bytes per tag. Let's be safe and allocate x2, which makes
* 0x4980 bytes for 64 tags, and round up to 0x6000 bytes for 64 tags.
*
* For 4 GiB of memory we'll have 8192 tags which makes 3 MiB, < 0.1 %.
*/
tag_size = (priv->num_tags / 64) * 0x6000 + tag_margin;
tag_size += tag_align;
tag_size = (tag_size + 0xfff) >> 12; /* round up */
ret = nouveau_mm_tail(&pfb->vram, 0, tag_size, tag_size, 1,
&priv->tag_ram);
if (ret) {
priv->num_tags = 0;
} else {
u64 tag_base = (priv->tag_ram->offset << 12) + tag_margin;
tag_base += tag_align - 1;
ret = do_div(tag_base, tag_align);
nv_wr32(priv, 0x17e8d4, tag_base);
}
ret = nouveau_mm_init(&priv->tags, 0, priv->num_tags, 1);
return ret;
}
static int
nvc0_ltcg_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
struct nouveau_oclass *oclass, void *data, u32 size,
struct nouveau_object **pobject)
{
struct nvc0_ltcg_priv *priv;
struct nouveau_fb *pfb = nouveau_fb(parent);
int ret;
ret = nouveau_ltcg_create(parent, engine, oclass, &priv);
*pobject = nv_object(priv);
if (ret)
return ret;
priv->part_nr = nv_rd32(priv, 0x022438);
priv->part_mask = nv_rd32(priv, 0x022554);
priv->subp_nr = nv_rd32(priv, 0x17e8dc) >> 28;
nv_mask(priv, 0x17e820, 0x00100000, 0x00000000); /* INTR_EN &= ~0x10 */
ret = nvc0_ltcg_init_tag_ram(pfb, priv);
if (ret)
return ret;
priv->base.tags_alloc = nvc0_ltcg_tags_alloc;
priv->base.tags_free = nvc0_ltcg_tags_free;
priv->base.tags_clear = nvc0_ltcg_tags_clear;
nv_subdev(priv)->intr = nvc0_ltcg_intr;
return 0;
}
static void
nvc0_ltcg_dtor(struct nouveau_object *object)
{
struct nouveau_ltcg *ltcg = (struct nouveau_ltcg *)object;
struct nvc0_ltcg_priv *priv = (struct nvc0_ltcg_priv *)ltcg;
struct nouveau_fb *pfb = nouveau_fb(ltcg->base.base.parent);
nouveau_mm_fini(&priv->tags);
nouveau_mm_free(&pfb->vram, &priv->tag_ram);
nouveau_ltcg_destroy(ltcg);
}
struct nouveau_oclass
nvc0_ltcg_oclass = {
.handle = NV_SUBDEV(LTCG, 0xc0),
.ofuncs = &(struct nouveau_ofuncs) {
.ctor = nvc0_ltcg_ctor,
.dtor = nvc0_ltcg_dtor,
.init = _nouveau_ltcg_init,
.fini = _nouveau_ltcg_fini,
},
};
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