/*
 * 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 "channv50.h"

#include <core/client.h>
#include <core/ramht.h>
#include <subdev/mmu.h>
#include <subdev/timer.h>

static int
nv50_fifo_chan_engine_addr(struct nvkm_engine *engine)
{
        switch (engine->subdev.index) {
        case NVKM_ENGINE_DMAOBJ:
        case NVKM_ENGINE_SW    : return -1;
        case NVKM_ENGINE_GR    : return 0x0000;
        case NVKM_ENGINE_MPEG  : return 0x0060;
        default:
                WARN_ON(1);
                return -1;
        }
}

static int
nv50_fifo_chan_engine_fini(struct nvkm_fifo_chan *base,
                           struct nvkm_engine *engine, bool suspend)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        struct nv50_fifo *fifo = chan->fifo;
        struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
        struct nvkm_device *device = subdev->device;
        int offset, ret = 0;
        u32 me;

        offset = nv50_fifo_chan_engine_addr(engine);
        if (offset < 0)
                return 0;

        /* HW bug workaround:
         *
         * PFIFO will hang forever if the connected engines don't report
         * that they've processed the context switch request.
         *
         * In order for the kickoff to work, we need to ensure all the
         * connected engines are in a state where they can answer.
         *
         * Newer chipsets don't seem to suffer from this issue, and well,
         * there's also a "ignore these engines" bitmask reg we can use
         * if we hit the issue there..
         */
        me = nvkm_mask(device, 0x00b860, 0x00000001, 0x00000001);

        /* do the kickoff... */
        nvkm_wr32(device, 0x0032fc, chan->base.inst->addr >> 12);
        if (nvkm_msec(device, 2000,
                if (nvkm_rd32(device, 0x0032fc) != 0xffffffff)
                        break;
        ) < 0) {
                nvkm_error(subdev, "channel %d [%s] unload timeout\n",
                           chan->base.chid, chan->base.object.client->name);
                if (suspend)
                        ret = -EBUSY;
        }
        nvkm_wr32(device, 0x00b860, me);

        if (ret == 0) {
                nvkm_kmap(chan->eng);
                nvkm_wo32(chan->eng, offset + 0x00, 0x00000000);
                nvkm_wo32(chan->eng, offset + 0x04, 0x00000000);
                nvkm_wo32(chan->eng, offset + 0x08, 0x00000000);
                nvkm_wo32(chan->eng, offset + 0x0c, 0x00000000);
                nvkm_wo32(chan->eng, offset + 0x10, 0x00000000);
                nvkm_wo32(chan->eng, offset + 0x14, 0x00000000);
                nvkm_done(chan->eng);
        }

        return ret;
}

static int
nv50_fifo_chan_engine_init(struct nvkm_fifo_chan *base,
                           struct nvkm_engine *engine)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        struct nvkm_gpuobj *engn = chan->engn[engine->subdev.index];
        u64 limit, start;
        int offset;

        offset = nv50_fifo_chan_engine_addr(engine);
        if (offset < 0)
                return 0;
        limit = engn->addr + engn->size - 1;
        start = engn->addr;

        nvkm_kmap(chan->eng);
        nvkm_wo32(chan->eng, offset + 0x00, 0x00190000);
        nvkm_wo32(chan->eng, offset + 0x04, lower_32_bits(limit));
        nvkm_wo32(chan->eng, offset + 0x08, lower_32_bits(start));
        nvkm_wo32(chan->eng, offset + 0x0c, upper_32_bits(limit) << 24 |
                                            upper_32_bits(start));
        nvkm_wo32(chan->eng, offset + 0x10, 0x00000000);
        nvkm_wo32(chan->eng, offset + 0x14, 0x00000000);
        nvkm_done(chan->eng);
        return 0;
}

void
nv50_fifo_chan_engine_dtor(struct nvkm_fifo_chan *base,
                           struct nvkm_engine *engine)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        nvkm_gpuobj_del(&chan->engn[engine->subdev.index]);
}

static int
nv50_fifo_chan_engine_ctor(struct nvkm_fifo_chan *base,
                           struct nvkm_engine *engine,
                           struct nvkm_object *object)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        int engn = engine->subdev.index;

        if (nv50_fifo_chan_engine_addr(engine) < 0)
                return 0;

        return nvkm_object_bind(object, NULL, 0, &chan->engn[engn]);
}

void
nv50_fifo_chan_object_dtor(struct nvkm_fifo_chan *base, int cookie)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        nvkm_ramht_remove(chan->ramht, cookie);
}

static int
nv50_fifo_chan_object_ctor(struct nvkm_fifo_chan *base,
                           struct nvkm_object *object)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        u32 handle = object->handle;
        u32 context;

        switch (object->engine->subdev.index) {
        case NVKM_ENGINE_DMAOBJ:
        case NVKM_ENGINE_SW    : context = 0x00000000; break;
        case NVKM_ENGINE_GR    : context = 0x00100000; break;
        case NVKM_ENGINE_MPEG  : context = 0x00200000; break;
        default:
                WARN_ON(1);
                return -EINVAL;
        }

        return nvkm_ramht_insert(chan->ramht, object, 0, 4, handle, context);
}

void
nv50_fifo_chan_fini(struct nvkm_fifo_chan *base)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        struct nv50_fifo *fifo = chan->fifo;
        struct nvkm_device *device = fifo->base.engine.subdev.device;
        u32 chid = chan->base.chid;

        /* remove channel from runlist, fifo will unload context */
        nvkm_mask(device, 0x002600 + (chid * 4), 0x80000000, 0x00000000);
        nv50_fifo_runlist_update(fifo);
        nvkm_wr32(device, 0x002600 + (chid * 4), 0x00000000);
}

static void
nv50_fifo_chan_init(struct nvkm_fifo_chan *base)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        struct nv50_fifo *fifo = chan->fifo;
        struct nvkm_device *device = fifo->base.engine.subdev.device;
        u64 addr = chan->ramfc->addr >> 12;
        u32 chid = chan->base.chid;

        nvkm_wr32(device, 0x002600 + (chid * 4), 0x80000000 | addr);
        nv50_fifo_runlist_update(fifo);
}

void *
nv50_fifo_chan_dtor(struct nvkm_fifo_chan *base)
{
        struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
        nvkm_vm_ref(NULL, &chan->vm, chan->pgd);
        nvkm_ramht_del(&chan->ramht);
        nvkm_gpuobj_del(&chan->pgd);
        nvkm_gpuobj_del(&chan->eng);
        nvkm_gpuobj_del(&chan->cache);
        nvkm_gpuobj_del(&chan->ramfc);
        return chan;
}

static const struct nvkm_fifo_chan_func
nv50_fifo_chan_func = {
        .dtor = nv50_fifo_chan_dtor,
        .init = nv50_fifo_chan_init,
        .fini = nv50_fifo_chan_fini,
        .engine_ctor = nv50_fifo_chan_engine_ctor,
        .engine_dtor = nv50_fifo_chan_engine_dtor,
        .engine_init = nv50_fifo_chan_engine_init,
        .engine_fini = nv50_fifo_chan_engine_fini,
        .object_ctor = nv50_fifo_chan_object_ctor,
        .object_dtor = nv50_fifo_chan_object_dtor,
};

int
nv50_fifo_chan_ctor(struct nv50_fifo *fifo, u64 vm, u64 push,
                    const struct nvkm_oclass *oclass,
                    struct nv50_fifo_chan *chan)
{
        struct nvkm_device *device = fifo->base.engine.subdev.device;
        int ret;

        ret = nvkm_fifo_chan_ctor(&nv50_fifo_chan_func, &fifo->base,
                                  0x10000, 0x1000, false, vm, push,
                                  (1ULL << NVKM_ENGINE_DMAOBJ) |
                                  (1ULL << NVKM_ENGINE_SW) |
                                  (1ULL << NVKM_ENGINE_GR) |
                                  (1ULL << NVKM_ENGINE_MPEG),
                                  0, 0xc00000, 0x2000, oclass, &chan->base);
        chan->fifo = fifo;
        if (ret)
                return ret;

        ret = nvkm_gpuobj_new(device, 0x0200, 0x1000, true, chan->base.inst,
                              &chan->ramfc);
        if (ret)
                return ret;

        ret = nvkm_gpuobj_new(device, 0x1200, 0, true, chan->base.inst,
                              &chan->eng);
        if (ret)
                return ret;

        ret = nvkm_gpuobj_new(device, 0x4000, 0, false, chan->base.inst,
                              &chan->pgd);
        if (ret)
                return ret;

        ret = nvkm_ramht_new(device, 0x8000, 16, chan->base.inst, &chan->ramht);
        if (ret)
                return ret;

        return nvkm_vm_ref(chan->base.vm, &chan->vm, chan->pgd);
}