/*
 * Copyright 2013 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 "priv.h"
#include "conn.h"
#include "head.h"
#include "ior.h"
#include "outp.h"

#include <core/client.h>
#include <core/ramht.h>

#include <nvif/class.h>
#include <nvif/cl0046.h>
#include <nvif/event.h>
#include <nvif/unpack.h>

static void
nvkm_disp_vblank_fini(struct nvkm_event *event, int type, int id)
{
        struct nvkm_disp *disp = container_of(event, typeof(*disp), vblank);
        struct nvkm_head *head = nvkm_head_find(disp, id);
        if (head)
                head->func->vblank_put(head);
}

static void
nvkm_disp_vblank_init(struct nvkm_event *event, int type, int id)
{
        struct nvkm_disp *disp = container_of(event, typeof(*disp), vblank);
        struct nvkm_head *head = nvkm_head_find(disp, id);
        if (head)
                head->func->vblank_get(head);
}

static const struct nvkm_event_func
nvkm_disp_vblank_func = {
        .init = nvkm_disp_vblank_init,
        .fini = nvkm_disp_vblank_fini,
};

void
nvkm_disp_vblank(struct nvkm_disp *disp, int head)
{
        nvkm_event_ntfy(&disp->vblank, head, NVKM_DISP_HEAD_EVENT_VBLANK);
}

static int
nvkm_disp_class_new(struct nvkm_device *device,
                    const struct nvkm_oclass *oclass, void *data, u32 size,
                    struct nvkm_object **pobject)
{
        return nvkm_udisp_new(oclass, data, size, pobject);
}

static const struct nvkm_device_oclass
nvkm_disp_sclass = {
        .ctor = nvkm_disp_class_new,
};

static int
nvkm_disp_class_get(struct nvkm_oclass *oclass, int index,
                    const struct nvkm_device_oclass **class)
{
        struct nvkm_disp *disp = nvkm_disp(oclass->engine);
        if (index == 0) {
                oclass->base = disp->func->root;
                *class = &nvkm_disp_sclass;
                return 0;
        }
        return 1;
}

static void
nvkm_disp_intr(struct nvkm_engine *engine)
{
        struct nvkm_disp *disp = nvkm_disp(engine);
        disp->func->intr(disp);
}

static int
nvkm_disp_fini(struct nvkm_engine *engine, enum nvkm_suspend_state suspend)
{
        struct nvkm_disp *disp = nvkm_disp(engine);
        struct nvkm_outp *outp;

        if (disp->func->fini)
                disp->func->fini(disp, suspend != NVKM_POWEROFF);

        list_for_each_entry(outp, &disp->outps, head) {
                if (outp->func->fini)
                        outp->func->fini(outp);
        }

        return 0;
}

static int
nvkm_disp_init(struct nvkm_engine *engine)
{
        struct nvkm_disp *disp = nvkm_disp(engine);
        struct nvkm_outp *outp;
        struct nvkm_ior *ior;

        list_for_each_entry(outp, &disp->outps, head) {
                if (outp->func->init)
                        outp->func->init(outp);
        }

        if (disp->func->init) {
                int ret = disp->func->init(disp);
                if (ret)
                        return ret;
        }

        /* Set 'normal' (ie. when it's attached to a head) state for
         * each output resource to 'fully enabled'.
         */
        list_for_each_entry(ior, &disp->iors, head) {
                if (ior->func->power)
                        ior->func->power(ior, true, true, true, true, true);
        }

        return 0;
}

static int
nvkm_disp_oneinit(struct nvkm_engine *engine)
{
        struct nvkm_disp *disp = nvkm_disp(engine);
        struct nvkm_subdev *subdev = &disp->engine.subdev;
        struct nvkm_head *head;
        int ret, i;

        if (disp->func->oneinit) {
                ret = disp->func->oneinit(disp);
                if (ret)
                        return ret;
        }

        i = 0;
        list_for_each_entry(head, &disp->heads, head)
                i = max(i, head->id + 1);

        return nvkm_event_init(&nvkm_disp_vblank_func, subdev, 1, i, &disp->vblank);
}

static void *
nvkm_disp_dtor(struct nvkm_engine *engine)
{
        struct nvkm_disp *disp = nvkm_disp(engine);
        struct nvkm_conn *conn;
        struct nvkm_outp *outp;
        struct nvkm_ior *ior;
        struct nvkm_head *head;
        void *data = disp;

        nvkm_ramht_del(&disp->ramht);
        nvkm_gpuobj_del(&disp->inst);

        nvkm_event_fini(&disp->uevent);

        if (disp->super.wq) {
                destroy_workqueue(disp->super.wq);
                mutex_destroy(&disp->super.mutex);
        }

        nvkm_event_fini(&disp->vblank);

        while (!list_empty(&disp->conns)) {
                conn = list_first_entry(&disp->conns, typeof(*conn), head);
                list_del(&conn->head);
                nvkm_conn_del(&conn);
        }

        while (!list_empty(&disp->outps)) {
                outp = list_first_entry(&disp->outps, typeof(*outp), head);
                list_del(&outp->head);
                nvkm_outp_del(&outp);
        }

        while (!list_empty(&disp->iors)) {
                ior = list_first_entry(&disp->iors, typeof(*ior), head);
                nvkm_ior_del(&ior);
        }

        while (!list_empty(&disp->heads)) {
                head = list_first_entry(&disp->heads, typeof(*head), head);
                nvkm_head_del(&head);
        }

        if (disp->func && disp->func->dtor)
                disp->func->dtor(disp);

        return data;
}

static const struct nvkm_engine_func
nvkm_disp = {
        .dtor = nvkm_disp_dtor,
        .oneinit = nvkm_disp_oneinit,
        .init = nvkm_disp_init,
        .fini = nvkm_disp_fini,
        .intr = nvkm_disp_intr,
        .base.sclass = nvkm_disp_class_get,
};

int
nvkm_disp_new_(const struct nvkm_disp_func *func, struct nvkm_device *device,
               enum nvkm_subdev_type type, int inst, struct nvkm_disp **pdisp)
{
        struct nvkm_disp *disp;
        int ret;

        if (!(disp = *pdisp = kzalloc_obj(**pdisp)))
                return -ENOMEM;

        disp->func = func;
        INIT_LIST_HEAD(&disp->heads);
        INIT_LIST_HEAD(&disp->iors);
        INIT_LIST_HEAD(&disp->outps);
        INIT_LIST_HEAD(&disp->conns);
        spin_lock_init(&disp->client.lock);

        ret = nvkm_engine_ctor(&nvkm_disp, device, type, inst, true, &disp->engine);
        if (ret) {
                disp->func = NULL;
                return ret;
        }

        if (func->super) {
                disp->super.wq = create_singlethread_workqueue("nvkm-disp");
                if (!disp->super.wq)
                        return -ENOMEM;

                INIT_WORK(&disp->super.work, func->super);
                mutex_init(&disp->super.mutex);
        }

        return nvkm_event_init(func->uevent, &disp->engine.subdev, 1, ARRAY_SIZE(disp->chan),
                               &disp->uevent);
}