/*
 * 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 "dp.h"
#include "head.h"
#include "ior.h"
#include "outp.h"

#include <core/client.h>
#include <core/notify.h>
#include <core/oproxy.h>
#include <subdev/bios.h>
#include <subdev/bios/dcb.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 int
nvkm_disp_vblank_ctor(struct nvkm_object *object, void *data, u32 size,
                      struct nvkm_notify *notify)
{
        struct nvkm_disp *disp =
                container_of(notify->event, typeof(*disp), vblank);
        union {
                struct nvif_notify_head_req_v0 v0;
        } *req = data;
        int ret = -ENOSYS;

        if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, false))) {
                notify->size = sizeof(struct nvif_notify_head_rep_v0);
                if (ret = -ENXIO, req->v0.head <= disp->vblank.index_nr) {
                        notify->types = 1;
                        notify->index = req->v0.head;
                        return 0;
                }
        }

        return ret;
}

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

void
nvkm_disp_vblank(struct nvkm_disp *disp, int head)
{
        struct nvif_notify_head_rep_v0 rep = {};
        nvkm_event_send(&disp->vblank, 1, head, &rep, sizeof(rep));
}

static int
nvkm_disp_hpd_ctor(struct nvkm_object *object, void *data, u32 size,
                   struct nvkm_notify *notify)
{
        struct nvkm_disp *disp =
                container_of(notify->event, typeof(*disp), hpd);
        union {
                struct nvif_notify_conn_req_v0 v0;
        } *req = data;
        struct nvkm_outp *outp;
        int ret = -ENOSYS;

        if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, false))) {
                notify->size = sizeof(struct nvif_notify_conn_rep_v0);
                list_for_each_entry(outp, &disp->outp, head) {
                        if (ret = -ENXIO, outp->conn->index == req->v0.conn) {
                                if (ret = -ENODEV, outp->conn->hpd.event) {
                                        notify->types = req->v0.mask;
                                        notify->index = req->v0.conn;
                                        ret = 0;
                                }
                                break;
                        }
                }
        }

        return ret;
}

static const struct nvkm_event_func
nvkm_disp_hpd_func = {
        .ctor = nvkm_disp_hpd_ctor
};

int
nvkm_disp_ntfy(struct nvkm_object *object, u32 type, struct nvkm_event **event)
{
        struct nvkm_disp *disp = nvkm_disp(object->engine);
        switch (type) {
        case NV04_DISP_NTFY_VBLANK:
                *event = &disp->vblank;
                return 0;
        case NV04_DISP_NTFY_CONN:
                *event = &disp->hpd;
                return 0;
        default:
                break;
        }
        return -EINVAL;
}

static void
nvkm_disp_class_del(struct nvkm_oproxy *oproxy)
{
        struct nvkm_disp *disp = nvkm_disp(oproxy->base.engine);
        spin_lock(&disp->client.lock);
        if (disp->client.object == oproxy)
                disp->client.object = NULL;
        spin_unlock(&disp->client.lock);
}

static const struct nvkm_oproxy_func
nvkm_disp_class = {
        .dtor[1] = nvkm_disp_class_del,
};

static int
nvkm_disp_class_new(struct nvkm_device *device,
                    const struct nvkm_oclass *oclass, void *data, u32 size,
                    struct nvkm_object **pobject)
{
        const struct nvkm_disp_oclass *sclass = oclass->engn;
        struct nvkm_disp *disp = nvkm_disp(oclass->engine);
        struct nvkm_oproxy *oproxy;
        int ret;

        ret = nvkm_oproxy_new_(&nvkm_disp_class, oclass, &oproxy);
        if (ret)
                return ret;
        *pobject = &oproxy->base;

        spin_lock(&disp->client.lock);
        if (disp->client.object) {
                spin_unlock(&disp->client.lock);
                return -EBUSY;
        }
        disp->client.object = oproxy;
        spin_unlock(&disp->client.lock);

        return sclass->ctor(disp, oclass, data, size, &oproxy->object);
}

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) {
                const struct nvkm_disp_oclass *root = disp->func->root(disp);
                oclass->base = root->base;
                oclass->engn = 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, bool suspend)
{
        struct nvkm_disp *disp = nvkm_disp(engine);
        struct nvkm_conn *conn;
        struct nvkm_outp *outp;

        if (disp->func->fini)
                disp->func->fini(disp);

        list_for_each_entry(outp, &disp->outp, head) {
                nvkm_outp_fini(outp);
        }

        list_for_each_entry(conn, &disp->conn, head) {
                nvkm_conn_fini(conn);
        }

        return 0;
}

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

        list_for_each_entry(conn, &disp->conn, head) {
                nvkm_conn_init(conn);
        }

        list_for_each_entry(outp, &disp->outp, head) {
                nvkm_outp_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->ior, head) {
                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_bios *bios = subdev->device->bios;
        struct nvkm_outp *outp, *outt, *pair;
        struct nvkm_conn *conn;
        struct nvkm_head *head;
        struct nvkm_ior *ior;
        struct nvbios_connE connE;
        struct dcb_output dcbE;
        u8  hpd = 0, ver, hdr;
        u32 data;
        int ret, i;

        /* Create output path objects for each VBIOS display path. */
        i = -1;
        while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE))) {
                if (ver < 0x40) /* No support for chipsets prior to NV50. */
                        break;
                if (dcbE.type == DCB_OUTPUT_UNUSED)
                        continue;
                if (dcbE.type == DCB_OUTPUT_EOL)
                        break;
                outp = NULL;

                switch (dcbE.type) {
                case DCB_OUTPUT_ANALOG:
                case DCB_OUTPUT_TV:
                case DCB_OUTPUT_TMDS:
                case DCB_OUTPUT_LVDS:
                        ret = nvkm_outp_new(disp, i, &dcbE, &outp);
                        break;
                case DCB_OUTPUT_DP:
                        ret = nvkm_dp_new(disp, i, &dcbE, &outp);
                        break;
                case DCB_OUTPUT_WFD:
                        /* No support for WFD yet. */
                        ret = -ENODEV;
                        continue;
                default:
                        nvkm_warn(subdev, "dcb %d type %d unknown\n",
                                  i, dcbE.type);
                        continue;
                }

                if (ret) {
                        if (outp) {
                                if (ret != -ENODEV)
                                        OUTP_ERR(outp, "ctor failed: %d", ret);
                                else
                                        OUTP_DBG(outp, "not supported");
                                nvkm_outp_del(&outp);
                                continue;
                        }
                        nvkm_error(subdev, "failed to create outp %d\n", i);
                        continue;
                }

                list_add_tail(&outp->head, &disp->outp);
                hpd = max(hpd, (u8)(dcbE.connector + 1));
        }

        /* Create connector objects based on available output paths. */
        list_for_each_entry_safe(outp, outt, &disp->outp, head) {
                /* VBIOS data *should* give us the most useful information. */
                data = nvbios_connEp(bios, outp->info.connector, &ver, &hdr,
                                     &connE);

                /* No bios connector data... */
                if (!data) {
                        /* Heuristic: anything with the same ccb index is
                         * considered to be on the same connector, any
                         * output path without an associated ccb entry will
                         * be put on its own connector.
                         */
                        int ccb_index = outp->info.i2c_index;
                        if (ccb_index != 0xf) {
                                list_for_each_entry(pair, &disp->outp, head) {
                                        if (pair->info.i2c_index == ccb_index) {
                                                outp->conn = pair->conn;
                                                break;
                                        }
                                }
                        }

                        /* Connector shared with another output path. */
                        if (outp->conn)
                                continue;

                        memset(&connE, 0x00, sizeof(connE));
                        connE.type = DCB_CONNECTOR_NONE;
                        i = -1;
                } else {
                        i = outp->info.connector;
                }

                /* Check that we haven't already created this connector. */
                list_for_each_entry(conn, &disp->conn, head) {
                        if (conn->index == outp->info.connector) {
                                outp->conn = conn;
                                break;
                        }
                }

                if (outp->conn)
                        continue;

                /* Apparently we need to create a new one! */
                ret = nvkm_conn_new(disp, i, &connE, &outp->conn);
                if (ret) {
                        nvkm_error(&disp->engine.subdev,
                                   "failed to create outp %d conn: %d\n",
                                   outp->index, ret);
                        nvkm_conn_del(&outp->conn);
                        list_del(&outp->head);
                        nvkm_outp_del(&outp);
                        continue;
                }

                list_add_tail(&outp->conn->head, &disp->conn);
        }

        ret = nvkm_event_init(&nvkm_disp_hpd_func, 3, hpd, &disp->hpd);
        if (ret)
                return ret;

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

        /* Enforce identity-mapped SOR assignment for panels, which have
         * certain bits (ie. backlight controls) wired to a specific SOR.
         */
        list_for_each_entry(outp, &disp->outp, head) {
                if (outp->conn->info.type == DCB_CONNECTOR_LVDS ||
                    outp->conn->info.type == DCB_CONNECTOR_eDP) {
                        ior = nvkm_ior_find(disp, SOR, ffs(outp->info.or) - 1);
                        if (!WARN_ON(!ior))
                                ior->identity = true;
                        outp->identity = true;
                }
        }

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

        return nvkm_event_init(&nvkm_disp_vblank_func, 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;
        void *data = disp;

        if (disp->func->dtor)
                data = disp->func->dtor(disp);

        nvkm_event_fini(&disp->vblank);
        nvkm_event_fini(&disp->hpd);

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

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

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

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

        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_ctor(const struct nvkm_disp_func *func, struct nvkm_device *device,
               enum nvkm_subdev_type type, int inst, struct nvkm_disp *disp)
{
        disp->func = func;
        INIT_LIST_HEAD(&disp->head);
        INIT_LIST_HEAD(&disp->ior);
        INIT_LIST_HEAD(&disp->outp);
        INIT_LIST_HEAD(&disp->conn);
        spin_lock_init(&disp->client.lock);
        return nvkm_engine_ctor(&nvkm_disp, device, type, inst, true, &disp->engine);
}

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)
{
        if (!(*pdisp = kzalloc(sizeof(**pdisp), GFP_KERNEL)))
                return -ENOMEM;
        return nvkm_disp_ctor(func, device, type, inst, *pdisp);
}