/*
 * Driver for Renesas R-Car VIN
 *
 * Copyright (C) 2016 Renesas Electronics Corp.
 * Copyright (C) 2011-2013 Renesas Solutions Corp.
 * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com>
 * Copyright (C) 2008 Magnus Damm
 *
 * Based on the soc-camera rcar_vin driver
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>

#include <media/v4l2-async.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mc.h>

#include "rcar-vin.h"

/*
 * The companion CSI-2 receiver driver (rcar-csi2) is known
 * and we know it has one source pad (pad 0) and four sink
 * pads (pad 1-4). So to translate a pad on the remote
 * CSI-2 receiver to/from the VIN internal channel number simply
 * subtract/add one from the pad/channel number.
 */
#define rvin_group_csi_pad_to_channel(pad) ((pad) - 1)
#define rvin_group_csi_channel_to_pad(channel) ((channel) + 1)

/*
 * Not all VINs are created equal, master VINs control the
 * routing for other VIN's. We can figure out which VIN is
 * master by looking at a VINs id.
 */
#define rvin_group_id_to_master(vin) ((vin) < 4 ? 0 : 4)

/* -----------------------------------------------------------------------------
 * Media Controller link notification
 */

/* group lock should be held when calling this function. */
static int rvin_group_entity_to_csi_id(struct rvin_group *group,
                                       struct media_entity *entity)
{
        struct v4l2_subdev *sd;
        unsigned int i;

        sd = media_entity_to_v4l2_subdev(entity);

        for (i = 0; i < RVIN_CSI_MAX; i++)
                if (group->csi[i].subdev == sd)
                        return i;

        return -ENODEV;
}

static unsigned int rvin_group_get_mask(struct rvin_dev *vin,
                                        enum rvin_csi_id csi_id,
                                        unsigned char channel)
{
        const struct rvin_group_route *route;
        unsigned int mask = 0;

        for (route = vin->info->routes; route->mask; route++) {
                if (route->vin == vin->id &&
                    route->csi == csi_id &&
                    route->channel == channel) {
                        vin_dbg(vin,
                                "Adding route: vin: %d csi: %d channel: %d\n",
                                route->vin, route->csi, route->channel);
                        mask |= route->mask;
                }
        }

        return mask;
}

/*
 * Link setup for the links between a VIN and a CSI-2 receiver is a bit
 * complex. The reason for this is that the register controlling routing
 * is not present in each VIN instance. There are special VINs which
 * control routing for themselves and other VINs. There are not many
 * different possible links combinations that can be enabled at the same
 * time, therefor all already enabled links which are controlled by a
 * master VIN need to be taken into account when making the decision
 * if a new link can be enabled or not.
 *
 * 1. Find out which VIN the link the user tries to enable is connected to.
 * 2. Lookup which master VIN controls the links for this VIN.
 * 3. Start with a bitmask with all bits set.
 * 4. For each previously enabled link from the master VIN bitwise AND its
 *    route mask (see documentation for mask in struct rvin_group_route)
 *    with the bitmask.
 * 5. Bitwise AND the mask for the link the user tries to enable to the bitmask.
 * 6. If the bitmask is not empty at this point the new link can be enabled
 *    while keeping all previous links enabled. Update the CHSEL value of the
 *    master VIN and inform the user that the link could be enabled.
 *
 * Please note that no link can be enabled if any VIN in the group is
 * currently open.
 */
static int rvin_group_link_notify(struct media_link *link, u32 flags,
                                  unsigned int notification)
{
        struct rvin_group *group = container_of(link->graph_obj.mdev,
                                                struct rvin_group, mdev);
        unsigned int master_id, channel, mask_new, i;
        unsigned int mask = ~0;
        struct media_entity *entity;
        struct video_device *vdev;
        struct media_pad *csi_pad;
        struct rvin_dev *vin = NULL;
        int csi_id, ret;

        ret = v4l2_pipeline_link_notify(link, flags, notification);
        if (ret)
                return ret;

        /* Only care about link enablement for VIN nodes. */
        if (!(flags & MEDIA_LNK_FL_ENABLED) ||
            !is_media_entity_v4l2_video_device(link->sink->entity))
                return 0;

        /* If any entity is in use don't allow link changes. */
        media_device_for_each_entity(entity, &group->mdev)
                if (entity->use_count)
                        return -EBUSY;

        mutex_lock(&group->lock);

        /* Find the master VIN that controls the routes. */
        vdev = media_entity_to_video_device(link->sink->entity);
        vin = container_of(vdev, struct rvin_dev, vdev);
        master_id = rvin_group_id_to_master(vin->id);

        if (WARN_ON(!group->vin[master_id])) {
                ret = -ENODEV;
                goto out;
        }

        /* Build a mask for already enabled links. */
        for (i = master_id; i < master_id + 4; i++) {
                if (!group->vin[i])
                        continue;

                /* Get remote CSI-2, if any. */
                csi_pad = media_entity_remote_pad(
                                &group->vin[i]->vdev.entity.pads[0]);
                if (!csi_pad)
                        continue;

                csi_id = rvin_group_entity_to_csi_id(group, csi_pad->entity);
                channel = rvin_group_csi_pad_to_channel(csi_pad->index);

                mask &= rvin_group_get_mask(group->vin[i], csi_id, channel);
        }

        /* Add the new link to the existing mask and check if it works. */
        csi_id = rvin_group_entity_to_csi_id(group, link->source->entity);
        channel = rvin_group_csi_pad_to_channel(link->source->index);
        mask_new = mask & rvin_group_get_mask(vin, csi_id, channel);

        vin_dbg(vin, "Try link change mask: 0x%x new: 0x%x\n", mask, mask_new);

        if (!mask_new) {
                ret = -EMLINK;
                goto out;
        }

        /* New valid CHSEL found, set the new value. */
        ret = rvin_set_channel_routing(group->vin[master_id], __ffs(mask_new));
out:
        mutex_unlock(&group->lock);

        return ret;
}

static const struct media_device_ops rvin_media_ops = {
        .link_notify = rvin_group_link_notify,
};

/* -----------------------------------------------------------------------------
 * Gen3 CSI2 Group Allocator
 */

/* FIXME:  This should if we find a system that supports more
 * than one group for the whole system be replaced with a linked
 * list of groups. And eventually all of this should be replaced
 * with a global device allocator API.
 *
 * But for now this works as on all supported systems there will
 * be only one group for all instances.
 */

static DEFINE_MUTEX(rvin_group_lock);
static struct rvin_group *rvin_group_data;

static void rvin_group_cleanup(struct rvin_group *group)
{
        media_device_unregister(&group->mdev);
        media_device_cleanup(&group->mdev);
        mutex_destroy(&group->lock);
}

static int rvin_group_init(struct rvin_group *group, struct rvin_dev *vin)
{
        struct media_device *mdev = &group->mdev;
        const struct of_device_id *match;
        struct device_node *np;
        int ret;

        mutex_init(&group->lock);

        /* Count number of VINs in the system */
        group->count = 0;
        for_each_matching_node(np, vin->dev->driver->of_match_table)
                if (of_device_is_available(np))
                        group->count++;

        vin_dbg(vin, "found %u enabled VIN's in DT", group->count);

        mdev->dev = vin->dev;
        mdev->ops = &rvin_media_ops;

        match = of_match_node(vin->dev->driver->of_match_table,
                              vin->dev->of_node);

        strlcpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name));
        strlcpy(mdev->model, match->compatible, sizeof(mdev->model));
        snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
                 dev_name(mdev->dev));

        media_device_init(mdev);

        ret = media_device_register(&group->mdev);
        if (ret)
                rvin_group_cleanup(group);

        return ret;
}

static void rvin_group_release(struct kref *kref)
{
        struct rvin_group *group =
                container_of(kref, struct rvin_group, refcount);

        mutex_lock(&rvin_group_lock);

        rvin_group_data = NULL;

        rvin_group_cleanup(group);

        kfree(group);

        mutex_unlock(&rvin_group_lock);
}

static int rvin_group_get(struct rvin_dev *vin)
{
        struct rvin_group *group;
        u32 id;
        int ret;

        /* Make sure VIN id is present and sane */
        ret = of_property_read_u32(vin->dev->of_node, "renesas,id", &id);
        if (ret) {
                vin_err(vin, "%pOF: No renesas,id property found\n",
                        vin->dev->of_node);
                return -EINVAL;
        }

        if (id >= RCAR_VIN_NUM) {
                vin_err(vin, "%pOF: Invalid renesas,id '%u'\n",
                        vin->dev->of_node, id);
                return -EINVAL;
        }

        /* Join or create a VIN group */
        mutex_lock(&rvin_group_lock);
        if (rvin_group_data) {
                group = rvin_group_data;
                kref_get(&group->refcount);
        } else {
                group = kzalloc(sizeof(*group), GFP_KERNEL);
                if (!group) {
                        ret = -ENOMEM;
                        goto err_group;
                }

                ret = rvin_group_init(group, vin);
                if (ret) {
                        kfree(group);
                        vin_err(vin, "Failed to initialize group\n");
                        goto err_group;
                }

                kref_init(&group->refcount);

                rvin_group_data = group;
        }
        mutex_unlock(&rvin_group_lock);

        /* Add VIN to group */
        mutex_lock(&group->lock);

        if (group->vin[id]) {
                vin_err(vin, "Duplicate renesas,id property value %u\n", id);
                mutex_unlock(&group->lock);
                kref_put(&group->refcount, rvin_group_release);
                return -EINVAL;
        }

        group->vin[id] = vin;

        vin->id = id;
        vin->group = group;
        vin->v4l2_dev.mdev = &group->mdev;

        mutex_unlock(&group->lock);

        return 0;
err_group:
        mutex_unlock(&rvin_group_lock);
        return ret;
}

static void rvin_group_put(struct rvin_dev *vin)
{
        struct rvin_group *group = vin->group;

        mutex_lock(&group->lock);

        vin->group = NULL;
        vin->v4l2_dev.mdev = NULL;

        if (WARN_ON(group->vin[vin->id] != vin))
                goto out;

        group->vin[vin->id] = NULL;
out:
        mutex_unlock(&group->lock);

        kref_put(&group->refcount, rvin_group_release);
}

/* -----------------------------------------------------------------------------
 * Async notifier
 */

#define notifier_to_vin(n) container_of(n, struct rvin_dev, notifier)

static int rvin_find_pad(struct v4l2_subdev *sd, int direction)
{
        unsigned int pad;

        if (sd->entity.num_pads <= 1)
                return 0;

        for (pad = 0; pad < sd->entity.num_pads; pad++)
                if (sd->entity.pads[pad].flags & direction)
                        return pad;

        return -EINVAL;
}

/* -----------------------------------------------------------------------------
 * Digital async notifier
 */

/* The vin lock should be held when calling the subdevice attach and detach */
static int rvin_digital_subdevice_attach(struct rvin_dev *vin,
                                         struct v4l2_subdev *subdev)
{
        struct v4l2_subdev_mbus_code_enum code = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        int ret;

        /* Find source and sink pad of remote subdevice */
        ret = rvin_find_pad(subdev, MEDIA_PAD_FL_SOURCE);
        if (ret < 0)
                return ret;
        vin->digital->source_pad = ret;

        ret = rvin_find_pad(subdev, MEDIA_PAD_FL_SINK);
        vin->digital->sink_pad = ret < 0 ? 0 : ret;

        /* Find compatible subdevices mbus format */
        vin->mbus_code = 0;
        code.index = 0;
        code.pad = vin->digital->source_pad;
        while (!vin->mbus_code &&
               !v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL, &code)) {
                code.index++;
                switch (code.code) {
                case MEDIA_BUS_FMT_YUYV8_1X16:
                case MEDIA_BUS_FMT_UYVY8_1X16:
                case MEDIA_BUS_FMT_UYVY8_2X8:
                case MEDIA_BUS_FMT_UYVY10_2X10:
                case MEDIA_BUS_FMT_RGB888_1X24:
                        vin->mbus_code = code.code;
                        vin_dbg(vin, "Found media bus format for %s: %d\n",
                                subdev->name, vin->mbus_code);
                        break;
                default:
                        break;
                }
        }

        if (!vin->mbus_code) {
                vin_err(vin, "Unsupported media bus format for %s\n",
                        subdev->name);
                return -EINVAL;
        }

        /* Read tvnorms */
        ret = v4l2_subdev_call(subdev, video, g_tvnorms, &vin->vdev.tvnorms);
        if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
                return ret;

        /* Read standard */
        vin->std = V4L2_STD_UNKNOWN;
        ret = v4l2_subdev_call(subdev, video, g_std, &vin->std);
        if (ret < 0 && ret != -ENOIOCTLCMD)
                return ret;

        /* Add the controls */
        ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 16);
        if (ret < 0)
                return ret;

        ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, subdev->ctrl_handler,
                                    NULL);
        if (ret < 0) {
                v4l2_ctrl_handler_free(&vin->ctrl_handler);
                return ret;
        }

        vin->vdev.ctrl_handler = &vin->ctrl_handler;

        vin->digital->subdev = subdev;

        return 0;
}

static void rvin_digital_subdevice_detach(struct rvin_dev *vin)
{
        rvin_v4l2_unregister(vin);
        v4l2_ctrl_handler_free(&vin->ctrl_handler);

        vin->vdev.ctrl_handler = NULL;
        vin->digital->subdev = NULL;
}

static int rvin_digital_notify_complete(struct v4l2_async_notifier *notifier)
{
        struct rvin_dev *vin = notifier_to_vin(notifier);
        int ret;

        ret = v4l2_device_register_subdev_nodes(&vin->v4l2_dev);
        if (ret < 0) {
                vin_err(vin, "Failed to register subdev nodes\n");
                return ret;
        }

        return rvin_v4l2_register(vin);
}

static void rvin_digital_notify_unbind(struct v4l2_async_notifier *notifier,
                                       struct v4l2_subdev *subdev,
                                       struct v4l2_async_subdev *asd)
{
        struct rvin_dev *vin = notifier_to_vin(notifier);

        vin_dbg(vin, "unbind digital subdev %s\n", subdev->name);

        mutex_lock(&vin->lock);
        rvin_digital_subdevice_detach(vin);
        mutex_unlock(&vin->lock);
}

static int rvin_digital_notify_bound(struct v4l2_async_notifier *notifier,
                                     struct v4l2_subdev *subdev,
                                     struct v4l2_async_subdev *asd)
{
        struct rvin_dev *vin = notifier_to_vin(notifier);
        int ret;

        mutex_lock(&vin->lock);
        ret = rvin_digital_subdevice_attach(vin, subdev);
        mutex_unlock(&vin->lock);
        if (ret)
                return ret;

        v4l2_set_subdev_hostdata(subdev, vin);

        vin_dbg(vin, "bound subdev %s source pad: %u sink pad: %u\n",
                subdev->name, vin->digital->source_pad,
                vin->digital->sink_pad);

        return 0;
}

static const struct v4l2_async_notifier_operations rvin_digital_notify_ops = {
        .bound = rvin_digital_notify_bound,
        .unbind = rvin_digital_notify_unbind,
        .complete = rvin_digital_notify_complete,
};

static int rvin_digital_parse_v4l2(struct device *dev,
                                   struct v4l2_fwnode_endpoint *vep,
                                   struct v4l2_async_subdev *asd)
{
        struct rvin_dev *vin = dev_get_drvdata(dev);
        struct rvin_graph_entity *rvge =
                container_of(asd, struct rvin_graph_entity, asd);

        if (vep->base.port || vep->base.id)
                return -ENOTCONN;

        vin->mbus_cfg.type = vep->bus_type;

        switch (vin->mbus_cfg.type) {
        case V4L2_MBUS_PARALLEL:
                vin_dbg(vin, "Found PARALLEL media bus\n");
                vin->mbus_cfg.flags = vep->bus.parallel.flags;
                break;
        case V4L2_MBUS_BT656:
                vin_dbg(vin, "Found BT656 media bus\n");
                vin->mbus_cfg.flags = 0;
                break;
        default:
                vin_err(vin, "Unknown media bus type\n");
                return -EINVAL;
        }

        vin->digital = rvge;

        return 0;
}

static int rvin_digital_graph_init(struct rvin_dev *vin)
{
        int ret;

        ret = v4l2_async_notifier_parse_fwnode_endpoints(
                vin->dev, &vin->notifier,
                sizeof(struct rvin_graph_entity), rvin_digital_parse_v4l2);
        if (ret)
                return ret;

        if (!vin->digital)
                return -ENODEV;

        vin_dbg(vin, "Found digital subdevice %pOF\n",
                to_of_node(vin->digital->asd.match.fwnode));

        vin->notifier.ops = &rvin_digital_notify_ops;
        ret = v4l2_async_notifier_register(&vin->v4l2_dev, &vin->notifier);
        if (ret < 0) {
                vin_err(vin, "Notifier registration failed\n");
                return ret;
        }

        return 0;
}

/* -----------------------------------------------------------------------------
 * Group async notifier
 */

static int rvin_group_notify_complete(struct v4l2_async_notifier *notifier)
{
        struct rvin_dev *vin = notifier_to_vin(notifier);
        const struct rvin_group_route *route;
        unsigned int i;
        int ret;

        ret = v4l2_device_register_subdev_nodes(&vin->v4l2_dev);
        if (ret) {
                vin_err(vin, "Failed to register subdev nodes\n");
                return ret;
        }

        /* Register all video nodes for the group. */
        for (i = 0; i < RCAR_VIN_NUM; i++) {
                if (vin->group->vin[i]) {
                        ret = rvin_v4l2_register(vin->group->vin[i]);
                        if (ret)
                                return ret;
                }
        }

        /* Create all media device links between VINs and CSI-2's. */
        mutex_lock(&vin->group->lock);
        for (route = vin->info->routes; route->mask; route++) {
                struct media_pad *source_pad, *sink_pad;
                struct media_entity *source, *sink;
                unsigned int source_idx;

                /* Check that VIN is part of the group. */
                if (!vin->group->vin[route->vin])
                        continue;

                /* Check that VIN' master is part of the group. */
                if (!vin->group->vin[rvin_group_id_to_master(route->vin)])
                        continue;

                /* Check that CSI-2 is part of the group. */
                if (!vin->group->csi[route->csi].subdev)
                        continue;

                source = &vin->group->csi[route->csi].subdev->entity;
                source_idx = rvin_group_csi_channel_to_pad(route->channel);
                source_pad = &source->pads[source_idx];

                sink = &vin->group->vin[route->vin]->vdev.entity;
                sink_pad = &sink->pads[0];

                /* Skip if link already exists. */
                if (media_entity_find_link(source_pad, sink_pad))
                        continue;

                ret = media_create_pad_link(source, source_idx, sink, 0, 0);
                if (ret) {
                        vin_err(vin, "Error adding link from %s to %s\n",
                                source->name, sink->name);
                        break;
                }
        }
        mutex_unlock(&vin->group->lock);

        return ret;
}

static void rvin_group_notify_unbind(struct v4l2_async_notifier *notifier,
                                     struct v4l2_subdev *subdev,
                                     struct v4l2_async_subdev *asd)
{
        struct rvin_dev *vin = notifier_to_vin(notifier);
        unsigned int i;

        for (i = 0; i < RCAR_VIN_NUM; i++)
                if (vin->group->vin[i])
                        rvin_v4l2_unregister(vin->group->vin[i]);

        mutex_lock(&vin->group->lock);

        for (i = 0; i < RVIN_CSI_MAX; i++) {
                if (vin->group->csi[i].fwnode != asd->match.fwnode)
                        continue;
                vin->group->csi[i].subdev = NULL;
                vin_dbg(vin, "Unbind CSI-2 %s from slot %u\n", subdev->name, i);
                break;
        }

        mutex_unlock(&vin->group->lock);
}

static int rvin_group_notify_bound(struct v4l2_async_notifier *notifier,
                                   struct v4l2_subdev *subdev,
                                   struct v4l2_async_subdev *asd)
{
        struct rvin_dev *vin = notifier_to_vin(notifier);
        unsigned int i;

        mutex_lock(&vin->group->lock);

        for (i = 0; i < RVIN_CSI_MAX; i++) {
                if (vin->group->csi[i].fwnode != asd->match.fwnode)
                        continue;
                vin->group->csi[i].subdev = subdev;
                vin_dbg(vin, "Bound CSI-2 %s to slot %u\n", subdev->name, i);
                break;
        }

        mutex_unlock(&vin->group->lock);

        return 0;
}

static const struct v4l2_async_notifier_operations rvin_group_notify_ops = {
        .bound = rvin_group_notify_bound,
        .unbind = rvin_group_notify_unbind,
        .complete = rvin_group_notify_complete,
};

static int rvin_mc_parse_of_endpoint(struct device *dev,
                                     struct v4l2_fwnode_endpoint *vep,
                                     struct v4l2_async_subdev *asd)
{
        struct rvin_dev *vin = dev_get_drvdata(dev);

        if (vep->base.port != 1 || vep->base.id >= RVIN_CSI_MAX)
                return -EINVAL;

        if (!of_device_is_available(to_of_node(asd->match.fwnode))) {

                vin_dbg(vin, "OF device %pOF disabled, ignoring\n",
                        to_of_node(asd->match.fwnode));
                return -ENOTCONN;

        }

        if (vin->group->csi[vep->base.id].fwnode) {
                vin_dbg(vin, "OF device %pOF already handled\n",
                        to_of_node(asd->match.fwnode));
                return -ENOTCONN;
        }

        vin->group->csi[vep->base.id].fwnode = asd->match.fwnode;

        vin_dbg(vin, "Add group OF device %pOF to slot %u\n",
                to_of_node(asd->match.fwnode), vep->base.id);

        return 0;
}

static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
{
        unsigned int count = 0;
        unsigned int i;
        int ret;

        mutex_lock(&vin->group->lock);

        /* If there already is a notifier something has gone wrong, bail out. */
        if (WARN_ON(vin->group->notifier)) {
                mutex_unlock(&vin->group->lock);
                return -EINVAL;
        }

        /* If not all VIN's are registered don't register the notifier. */
        for (i = 0; i < RCAR_VIN_NUM; i++)
                if (vin->group->vin[i])
                        count++;

        if (vin->group->count != count) {
                mutex_unlock(&vin->group->lock);
                return 0;
        }

        /*
         * Have all VIN's look for subdevices. Some subdevices will overlap
         * but the parser function can handle it, so each subdevice will
         * only be registered once with the notifier.
         */

        vin->group->notifier = &vin->notifier;

        for (i = 0; i < RCAR_VIN_NUM; i++) {
                if (!vin->group->vin[i])
                        continue;

                ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
                                vin->group->vin[i]->dev, vin->group->notifier,
                                sizeof(struct v4l2_async_subdev), 1,
                                rvin_mc_parse_of_endpoint);
                if (ret) {
                        mutex_unlock(&vin->group->lock);
                        return ret;
                }
        }

        mutex_unlock(&vin->group->lock);

        vin->group->notifier->ops = &rvin_group_notify_ops;

        ret = v4l2_async_notifier_register(&vin->v4l2_dev, &vin->notifier);
        if (ret < 0) {
                vin_err(vin, "Notifier registration failed\n");
                return ret;
        }

        return 0;
}

static int rvin_mc_init(struct rvin_dev *vin)
{
        int ret;

        /* All our sources are CSI-2 */
        vin->mbus_cfg.type = V4L2_MBUS_CSI2;
        vin->mbus_cfg.flags = 0;

        vin->pad.flags = MEDIA_PAD_FL_SINK;
        ret = media_entity_pads_init(&vin->vdev.entity, 1, &vin->pad);
        if (ret)
                return ret;

        ret = rvin_group_get(vin);
        if (ret)
                return ret;

        ret = rvin_mc_parse_of_graph(vin);
        if (ret)
                rvin_group_put(vin);

        return ret;
}

/* -----------------------------------------------------------------------------
 * Platform Device Driver
 */

static const struct rvin_info rcar_info_h1 = {
        .model = RCAR_H1,
        .use_mc = false,
        .max_width = 2048,
        .max_height = 2048,
};

static const struct rvin_info rcar_info_m1 = {
        .model = RCAR_M1,
        .use_mc = false,
        .max_width = 2048,
        .max_height = 2048,
};

static const struct rvin_info rcar_info_gen2 = {
        .model = RCAR_GEN2,
        .use_mc = false,
        .max_width = 2048,
        .max_height = 2048,
};

static const struct rvin_group_route rcar_info_r8a7795_routes[] = {
        { .csi = RVIN_CSI40, .channel = 0, .vin = 0, .mask = BIT(0) | BIT(3) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 0, .mask = BIT(1) | BIT(4) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 0, .mask = BIT(2) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 1, .mask = BIT(0) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 1, .mask = BIT(1) | BIT(3) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 1, .mask = BIT(2) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 1, .mask = BIT(4) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 2, .mask = BIT(0) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 2, .mask = BIT(1) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 2, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 2, .vin = 2, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 2, .vin = 2, .mask = BIT(4) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 3, .mask = BIT(0) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 3, .mask = BIT(1) | BIT(2) },
        { .csi = RVIN_CSI40, .channel = 3, .vin = 3, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 3, .vin = 3, .mask = BIT(4) },
        { .csi = RVIN_CSI41, .channel = 0, .vin = 4, .mask = BIT(0) | BIT(3) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 4, .mask = BIT(1) | BIT(4) },
        { .csi = RVIN_CSI41, .channel = 1, .vin = 4, .mask = BIT(2) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 5, .mask = BIT(0) },
        { .csi = RVIN_CSI41, .channel = 1, .vin = 5, .mask = BIT(1) | BIT(3) },
        { .csi = RVIN_CSI41, .channel = 0, .vin = 5, .mask = BIT(2) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 5, .mask = BIT(4) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 6, .mask = BIT(0) },
        { .csi = RVIN_CSI41, .channel = 0, .vin = 6, .mask = BIT(1) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 6, .mask = BIT(2) },
        { .csi = RVIN_CSI41, .channel = 2, .vin = 6, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 2, .vin = 6, .mask = BIT(4) },
        { .csi = RVIN_CSI41, .channel = 1, .vin = 7, .mask = BIT(0) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 7, .mask = BIT(1) | BIT(2) },
        { .csi = RVIN_CSI41, .channel = 3, .vin = 7, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 3, .vin = 7, .mask = BIT(4) },
        { /* Sentinel */ }
};

static const struct rvin_info rcar_info_r8a7795 = {
        .model = RCAR_GEN3,
        .use_mc = true,
        .max_width = 4096,
        .max_height = 4096,
        .routes = rcar_info_r8a7795_routes,
};

static const struct rvin_group_route rcar_info_r8a7795es1_routes[] = {
        { .csi = RVIN_CSI40, .channel = 0, .vin = 0, .mask = BIT(0) | BIT(3) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 0, .mask = BIT(1) | BIT(4) },
        { .csi = RVIN_CSI21, .channel = 0, .vin = 0, .mask = BIT(2) | BIT(5) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 1, .mask = BIT(0) },
        { .csi = RVIN_CSI21, .channel = 0, .vin = 1, .mask = BIT(1) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 1, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 1, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 1, .mask = BIT(4) },
        { .csi = RVIN_CSI21, .channel = 1, .vin = 1, .mask = BIT(5) },
        { .csi = RVIN_CSI21, .channel = 0, .vin = 2, .mask = BIT(0) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 2, .mask = BIT(1) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 2, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 2, .vin = 2, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 2, .vin = 2, .mask = BIT(4) },
        { .csi = RVIN_CSI21, .channel = 2, .vin = 2, .mask = BIT(5) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 3, .mask = BIT(0) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 3, .mask = BIT(1) },
        { .csi = RVIN_CSI21, .channel = 1, .vin = 3, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 3, .vin = 3, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 3, .vin = 3, .mask = BIT(4) },
        { .csi = RVIN_CSI21, .channel = 3, .vin = 3, .mask = BIT(5) },
        { .csi = RVIN_CSI41, .channel = 0, .vin = 4, .mask = BIT(0) | BIT(3) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 4, .mask = BIT(1) | BIT(4) },
        { .csi = RVIN_CSI21, .channel = 0, .vin = 4, .mask = BIT(2) | BIT(5) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 5, .mask = BIT(0) },
        { .csi = RVIN_CSI21, .channel = 0, .vin = 5, .mask = BIT(1) },
        { .csi = RVIN_CSI41, .channel = 0, .vin = 5, .mask = BIT(2) },
        { .csi = RVIN_CSI41, .channel = 1, .vin = 5, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 5, .mask = BIT(4) },
        { .csi = RVIN_CSI21, .channel = 1, .vin = 5, .mask = BIT(5) },
        { .csi = RVIN_CSI21, .channel = 0, .vin = 6, .mask = BIT(0) },
        { .csi = RVIN_CSI41, .channel = 0, .vin = 6, .mask = BIT(1) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 6, .mask = BIT(2) },
        { .csi = RVIN_CSI41, .channel = 2, .vin = 6, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 2, .vin = 6, .mask = BIT(4) },
        { .csi = RVIN_CSI21, .channel = 2, .vin = 6, .mask = BIT(5) },
        { .csi = RVIN_CSI41, .channel = 1, .vin = 7, .mask = BIT(0) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 7, .mask = BIT(1) },
        { .csi = RVIN_CSI21, .channel = 1, .vin = 7, .mask = BIT(2) },
        { .csi = RVIN_CSI41, .channel = 3, .vin = 7, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 3, .vin = 7, .mask = BIT(4) },
        { .csi = RVIN_CSI21, .channel = 3, .vin = 7, .mask = BIT(5) },
        { /* Sentinel */ }
};

static const struct rvin_info rcar_info_r8a7795es1 = {
        .model = RCAR_GEN3,
        .use_mc = true,
        .max_width = 4096,
        .max_height = 4096,
        .routes = rcar_info_r8a7795es1_routes,
};

static const struct rvin_group_route rcar_info_r8a7796_routes[] = {
        { .csi = RVIN_CSI40, .channel = 0, .vin = 0, .mask = BIT(0) | BIT(3) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 0, .mask = BIT(1) | BIT(4) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 1, .mask = BIT(0) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 1, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 1, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 1, .mask = BIT(4) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 2, .mask = BIT(1) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 2, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 2, .vin = 2, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 2, .vin = 2, .mask = BIT(4) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 3, .mask = BIT(0) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 3, .mask = BIT(1) },
        { .csi = RVIN_CSI40, .channel = 3, .vin = 3, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 3, .vin = 3, .mask = BIT(4) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 4, .mask = BIT(0) | BIT(3) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 4, .mask = BIT(1) | BIT(4) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 5, .mask = BIT(0) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 5, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 5, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 5, .mask = BIT(4) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 6, .mask = BIT(1) },
        { .csi = RVIN_CSI20, .channel = 0, .vin = 6, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 2, .vin = 6, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 2, .vin = 6, .mask = BIT(4) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 7, .mask = BIT(0) },
        { .csi = RVIN_CSI20, .channel = 1, .vin = 7, .mask = BIT(1) },
        { .csi = RVIN_CSI40, .channel = 3, .vin = 7, .mask = BIT(3) },
        { .csi = RVIN_CSI20, .channel = 3, .vin = 7, .mask = BIT(4) },
        { /* Sentinel */ }
};

static const struct rvin_info rcar_info_r8a7796 = {
        .model = RCAR_GEN3,
        .use_mc = true,
        .max_width = 4096,
        .max_height = 4096,
        .routes = rcar_info_r8a7796_routes,
};

static const struct rvin_group_route _rcar_info_r8a77970_routes[] = {
        { .csi = RVIN_CSI40, .channel = 0, .vin = 0, .mask = BIT(0) | BIT(3) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 1, .mask = BIT(2) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 1, .mask = BIT(3) },
        { .csi = RVIN_CSI40, .channel = 0, .vin = 2, .mask = BIT(1) },
        { .csi = RVIN_CSI40, .channel = 2, .vin = 2, .mask = BIT(3) },
        { .csi = RVIN_CSI40, .channel = 1, .vin = 3, .mask = BIT(0) },
        { .csi = RVIN_CSI40, .channel = 3, .vin = 3, .mask = BIT(3) },
        { /* Sentinel */ }
};

static const struct rvin_info rcar_info_r8a77970 = {
        .model = RCAR_GEN3,
        .use_mc = true,
        .max_width = 4096,
        .max_height = 4096,
        .routes = _rcar_info_r8a77970_routes,
};

static const struct of_device_id rvin_of_id_table[] = {
        {
                .compatible = "renesas,vin-r8a7778",
                .data = &rcar_info_m1,
        },

        {
                .compatible = "renesas,vin-r8a7779",
                .data = &rcar_info_h1,
        },
        {
                .compatible = "renesas,vin-r8a7790",
                .data = &rcar_info_gen2,
        },
        {
                .compatible = "renesas,vin-r8a7791",
                .data = &rcar_info_gen2,
        },
        {
                .compatible = "renesas,vin-r8a7793",
                .data = &rcar_info_gen2,
        },
        {
                .compatible = "renesas,vin-r8a7794",
                .data = &rcar_info_gen2,
        },
        {
                .compatible = "renesas,rcar-gen2-vin",
                .data = &rcar_info_gen2,
        },
        {
                .compatible = "renesas,vin-r8a7795",
                .data = &rcar_info_r8a7795,
        },
        {
                .compatible = "renesas,vin-r8a7796",
                .data = &rcar_info_r8a7796,
        },
        {
                .compatible = "renesas,vin-r8a77970",
                .data = &rcar_info_r8a77970,
        },
        { /* Sentinel */ },
};
MODULE_DEVICE_TABLE(of, rvin_of_id_table);

static const struct soc_device_attribute r8a7795es1[] = {
        {
                .soc_id = "r8a7795", .revision = "ES1.*",
                .data = &rcar_info_r8a7795es1,
        },
        { /* Sentinel */ }
};

static int rcar_vin_probe(struct platform_device *pdev)
{
        const struct soc_device_attribute *attr;
        struct rvin_dev *vin;
        struct resource *mem;
        int irq, ret;

        vin = devm_kzalloc(&pdev->dev, sizeof(*vin), GFP_KERNEL);
        if (!vin)
                return -ENOMEM;

        vin->dev = &pdev->dev;
        vin->info = of_device_get_match_data(&pdev->dev);

        /*
         * Special care is needed on r8a7795 ES1.x since it
         * uses different routing than r8a7795 ES2.0.
         */
        attr = soc_device_match(r8a7795es1);
        if (attr)
                vin->info = attr->data;

        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (mem == NULL)
                return -EINVAL;

        vin->base = devm_ioremap_resource(vin->dev, mem);
        if (IS_ERR(vin->base))
                return PTR_ERR(vin->base);

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return irq;

        ret = rvin_dma_register(vin, irq);
        if (ret)
                return ret;

        platform_set_drvdata(pdev, vin);
        if (vin->info->use_mc)
                ret = rvin_mc_init(vin);
        else
                ret = rvin_digital_graph_init(vin);
        if (ret < 0)
                goto error;

        pm_suspend_ignore_children(&pdev->dev, true);
        pm_runtime_enable(&pdev->dev);

        return 0;
error:
        rvin_dma_unregister(vin);
        v4l2_async_notifier_cleanup(&vin->notifier);

        return ret;
}

static int rcar_vin_remove(struct platform_device *pdev)
{
        struct rvin_dev *vin = platform_get_drvdata(pdev);

        pm_runtime_disable(&pdev->dev);

        rvin_v4l2_unregister(vin);

        v4l2_async_notifier_unregister(&vin->notifier);
        v4l2_async_notifier_cleanup(&vin->notifier);

        if (vin->info->use_mc) {
                mutex_lock(&vin->group->lock);
                if (vin->group->notifier == &vin->notifier)
                        vin->group->notifier = NULL;
                mutex_unlock(&vin->group->lock);
                rvin_group_put(vin);
        } else {
                v4l2_ctrl_handler_free(&vin->ctrl_handler);
        }

        rvin_dma_unregister(vin);

        return 0;
}

static struct platform_driver rcar_vin_driver = {
        .driver = {
                .name = "rcar-vin",
                .of_match_table = rvin_of_id_table,
        },
        .probe = rcar_vin_probe,
        .remove = rcar_vin_remove,
};

module_platform_driver(rcar_vin_driver);

MODULE_AUTHOR("Niklas Söderlund <niklas.soderlund@ragnatech.se>");
MODULE_DESCRIPTION("Renesas R-Car VIN camera host driver");
MODULE_LICENSE("GPL v2");