// SPDX-License-Identifier: GPL-2.0
/*
 * Hantro VPU codec driver
 *
 * Copyright (C) 2018 Collabora, Ltd.
 * Copyright 2018 Google LLC.
 *      Tomasz Figa <tfiga@chromium.org>
 *
 * Based on s5p-mfc driver by Samsung Electronics Co., Ltd.
 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/workqueue.h>
#include <media/v4l2-event.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-vmalloc.h>

#include "hantro_v4l2.h"
#include "hantro.h"
#include "hantro_hw.h"

#define DRIVER_NAME "hantro-vpu"

int hantro_debug;
module_param_named(debug, hantro_debug, int, 0644);
MODULE_PARM_DESC(debug,
                 "Debug level - higher value produces more verbose messages");

void *hantro_get_ctrl(struct hantro_ctx *ctx, u32 id)
{
        struct v4l2_ctrl *ctrl;

        ctrl = v4l2_ctrl_find(&ctx->ctrl_handler, id);
        return ctrl ? ctrl->p_cur.p : NULL;
}

dma_addr_t hantro_get_ref(struct vb2_queue *q, u64 ts)
{
        struct vb2_buffer *buf;
        int index;

        index = vb2_find_timestamp(q, ts, 0);
        if (index < 0)
                return 0;
        buf = vb2_get_buffer(q, index);
        return vb2_dma_contig_plane_dma_addr(buf, 0);
}

static int
hantro_enc_buf_finish(struct hantro_ctx *ctx, struct vb2_buffer *buf,
                      unsigned int bytesused)
{
        size_t avail_size;

        avail_size = vb2_plane_size(buf, 0) - ctx->vpu_dst_fmt->header_size;
        if (bytesused > avail_size)
                return -EINVAL;
        /*
         * The bounce buffer is only for the JPEG encoder.
         * TODO: Rework the JPEG encoder to eliminate the need
         * for a bounce buffer.
         */
        if (ctx->jpeg_enc.bounce_buffer.cpu) {
                memcpy(vb2_plane_vaddr(buf, 0) +
                       ctx->vpu_dst_fmt->header_size,
                       ctx->jpeg_enc.bounce_buffer.cpu, bytesused);
        }
        buf->planes[0].bytesused =
                ctx->vpu_dst_fmt->header_size + bytesused;
        return 0;
}

static int
hantro_dec_buf_finish(struct hantro_ctx *ctx, struct vb2_buffer *buf,
                      unsigned int bytesused)
{
        /* For decoders set bytesused as per the output picture. */
        buf->planes[0].bytesused = ctx->dst_fmt.plane_fmt[0].sizeimage;
        return 0;
}

static void hantro_job_finish(struct hantro_dev *vpu,
                              struct hantro_ctx *ctx,
                              unsigned int bytesused,
                              enum vb2_buffer_state result)
{
        struct vb2_v4l2_buffer *src, *dst;
        int ret;

        pm_runtime_mark_last_busy(vpu->dev);
        pm_runtime_put_autosuspend(vpu->dev);
        clk_bulk_disable(vpu->variant->num_clocks, vpu->clocks);

        src = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
        dst = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);

        if (WARN_ON(!src))
                return;
        if (WARN_ON(!dst))
                return;

        src->sequence = ctx->sequence_out++;
        dst->sequence = ctx->sequence_cap++;

        v4l2_m2m_buf_copy_metadata(src, dst, true);

        ret = ctx->buf_finish(ctx, &dst->vb2_buf, bytesused);
        if (ret)
                result = VB2_BUF_STATE_ERROR;

        v4l2_m2m_buf_done(src, result);
        v4l2_m2m_buf_done(dst, result);

        v4l2_m2m_job_finish(vpu->m2m_dev, ctx->fh.m2m_ctx);
}

void hantro_irq_done(struct hantro_dev *vpu, unsigned int bytesused,
                     enum vb2_buffer_state result)
{
        struct hantro_ctx *ctx =
                v4l2_m2m_get_curr_priv(vpu->m2m_dev);

        /*
         * If cancel_delayed_work returns false
         * the timeout expired. The watchdog is running,
         * and will take care of finishing the job.
         */
        if (cancel_delayed_work(&vpu->watchdog_work))
                hantro_job_finish(vpu, ctx, bytesused, result);
}

void hantro_watchdog(struct work_struct *work)
{
        struct hantro_dev *vpu;
        struct hantro_ctx *ctx;

        vpu = container_of(to_delayed_work(work),
                           struct hantro_dev, watchdog_work);
        ctx = v4l2_m2m_get_curr_priv(vpu->m2m_dev);
        if (ctx) {
                vpu_err("frame processing timed out!\n");
                ctx->codec_ops->reset(ctx);
                hantro_job_finish(vpu, ctx, 0, VB2_BUF_STATE_ERROR);
        }
}

static void device_run(void *priv)
{
        struct hantro_ctx *ctx = priv;
        int ret;

        ret = clk_bulk_enable(ctx->dev->variant->num_clocks, ctx->dev->clocks);
        if (ret)
                goto err_cancel_job;
        ret = pm_runtime_get_sync(ctx->dev->dev);
        if (ret < 0)
                goto err_cancel_job;

        ctx->codec_ops->run(ctx);
        return;

err_cancel_job:
        hantro_job_finish(ctx->dev, ctx, 0, VB2_BUF_STATE_ERROR);
}

bool hantro_is_encoder_ctx(const struct hantro_ctx *ctx)
{
        return ctx->buf_finish == hantro_enc_buf_finish;
}

static struct v4l2_m2m_ops vpu_m2m_ops = {
        .device_run = device_run,
};

static int
queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
{
        struct hantro_ctx *ctx = priv;
        int ret;

        src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
        src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
        src_vq->drv_priv = ctx;
        src_vq->ops = &hantro_queue_ops;
        src_vq->mem_ops = &vb2_dma_contig_memops;

        /*
         * Driver does mostly sequential access, so sacrifice TLB efficiency
         * for faster allocation. Also, no CPU access on the source queue,
         * so no kernel mapping needed.
         */
        src_vq->dma_attrs = DMA_ATTR_ALLOC_SINGLE_PAGES |
                            DMA_ATTR_NO_KERNEL_MAPPING;
        src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
        src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
        src_vq->lock = &ctx->dev->vpu_mutex;
        src_vq->dev = ctx->dev->v4l2_dev.dev;
        src_vq->supports_requests = true;

        ret = vb2_queue_init(src_vq);
        if (ret)
                return ret;

        /*
         * When encoding, the CAPTURE queue doesn't need dma memory,
         * as the CPU needs to create the JPEG frames, from the
         * hardware-produced JPEG payload.
         *
         * For the DMA destination buffer, we use a bounce buffer.
         */
        if (hantro_is_encoder_ctx(ctx)) {
                dst_vq->mem_ops = &vb2_vmalloc_memops;
        } else {
                dst_vq->bidirectional = true;
                dst_vq->mem_ops = &vb2_dma_contig_memops;
                dst_vq->dma_attrs = DMA_ATTR_ALLOC_SINGLE_PAGES |
                                    DMA_ATTR_NO_KERNEL_MAPPING;
        }

        dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
        dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
        dst_vq->drv_priv = ctx;
        dst_vq->ops = &hantro_queue_ops;
        dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
        dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
        dst_vq->lock = &ctx->dev->vpu_mutex;
        dst_vq->dev = ctx->dev->v4l2_dev.dev;

        return vb2_queue_init(dst_vq);
}

static int hantro_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct hantro_ctx *ctx;

        ctx = container_of(ctrl->handler,
                           struct hantro_ctx, ctrl_handler);

        vpu_debug(1, "s_ctrl: id = %d, val = %d\n", ctrl->id, ctrl->val);

        switch (ctrl->id) {
        case V4L2_CID_JPEG_COMPRESSION_QUALITY:
                ctx->jpeg_quality = ctrl->val;
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static const struct v4l2_ctrl_ops hantro_ctrl_ops = {
        .s_ctrl = hantro_s_ctrl,
};

static struct hantro_ctrl controls[] = {
        {
                .id = V4L2_CID_JPEG_COMPRESSION_QUALITY,
                .codec = HANTRO_JPEG_ENCODER,
                .cfg = {
                        .min = 5,
                        .max = 100,
                        .step = 1,
                        .def = 50,
                },
        }, {
                .id = V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS,
                .codec = HANTRO_MPEG2_DECODER,
                .cfg = {
                        .elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params),
                },
        }, {
                .id = V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION,
                .codec = HANTRO_MPEG2_DECODER,
                .cfg = {
                        .elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization),
                },
        },
};

static int hantro_ctrls_setup(struct hantro_dev *vpu,
                              struct hantro_ctx *ctx,
                              int allowed_codecs)
{
        int i, num_ctrls = ARRAY_SIZE(controls);

        v4l2_ctrl_handler_init(&ctx->ctrl_handler, num_ctrls);

        for (i = 0; i < num_ctrls; i++) {
                if (!(allowed_codecs & controls[i].codec))
                        continue;
                if (!controls[i].cfg.elem_size) {
                        v4l2_ctrl_new_std(&ctx->ctrl_handler,
                                          &hantro_ctrl_ops,
                                          controls[i].id, controls[i].cfg.min,
                                          controls[i].cfg.max,
                                          controls[i].cfg.step,
                                          controls[i].cfg.def);
                } else {
                        controls[i].cfg.id = controls[i].id;
                        v4l2_ctrl_new_custom(&ctx->ctrl_handler,
                                             &controls[i].cfg, NULL);
                }

                if (ctx->ctrl_handler.error) {
                        vpu_err("Adding control (%d) failed %d\n",
                                controls[i].id,
                                ctx->ctrl_handler.error);
                        v4l2_ctrl_handler_free(&ctx->ctrl_handler);
                        return ctx->ctrl_handler.error;
                }
        }
        return v4l2_ctrl_handler_setup(&ctx->ctrl_handler);
}

/*
 * V4L2 file operations.
 */

static int hantro_open(struct file *filp)
{
        struct hantro_dev *vpu = video_drvdata(filp);
        struct video_device *vdev = video_devdata(filp);
        struct hantro_func *func = hantro_vdev_to_func(vdev);
        struct hantro_ctx *ctx;
        int allowed_codecs, ret;

        /*
         * We do not need any extra locking here, because we operate only
         * on local data here, except reading few fields from dev, which
         * do not change through device's lifetime (which is guaranteed by
         * reference on module from open()) and V4L2 internal objects (such
         * as vdev and ctx->fh), which have proper locking done in respective
         * helper functions used here.
         */

        ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
                return -ENOMEM;

        ctx->dev = vpu;
        if (func->id == MEDIA_ENT_F_PROC_VIDEO_ENCODER) {
                allowed_codecs = vpu->variant->codec & HANTRO_ENCODERS;
                ctx->buf_finish = hantro_enc_buf_finish;
                ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(vpu->m2m_dev, ctx,
                                                    queue_init);
        } else if (func->id == MEDIA_ENT_F_PROC_VIDEO_DECODER) {
                allowed_codecs = vpu->variant->codec & HANTRO_DECODERS;
                ctx->buf_finish = hantro_dec_buf_finish;
                ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(vpu->m2m_dev, ctx,
                                                    queue_init);
        } else {
                ctx->fh.m2m_ctx = ERR_PTR(-ENODEV);
        }
        if (IS_ERR(ctx->fh.m2m_ctx)) {
                ret = PTR_ERR(ctx->fh.m2m_ctx);
                kfree(ctx);
                return ret;
        }

        v4l2_fh_init(&ctx->fh, vdev);
        filp->private_data = &ctx->fh;
        v4l2_fh_add(&ctx->fh);

        hantro_reset_fmts(ctx);

        ret = hantro_ctrls_setup(vpu, ctx, allowed_codecs);
        if (ret) {
                vpu_err("Failed to set up controls\n");
                goto err_fh_free;
        }
        ctx->fh.ctrl_handler = &ctx->ctrl_handler;

        return 0;

err_fh_free:
        v4l2_fh_del(&ctx->fh);
        v4l2_fh_exit(&ctx->fh);
        kfree(ctx);
        return ret;
}

static int hantro_release(struct file *filp)
{
        struct hantro_ctx *ctx =
                container_of(filp->private_data, struct hantro_ctx, fh);

        /*
         * No need for extra locking because this was the last reference
         * to this file.
         */
        v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
        v4l2_fh_del(&ctx->fh);
        v4l2_fh_exit(&ctx->fh);
        v4l2_ctrl_handler_free(&ctx->ctrl_handler);
        kfree(ctx);

        return 0;
}

static const struct v4l2_file_operations hantro_fops = {
        .owner = THIS_MODULE,
        .open = hantro_open,
        .release = hantro_release,
        .poll = v4l2_m2m_fop_poll,
        .unlocked_ioctl = video_ioctl2,
        .mmap = v4l2_m2m_fop_mmap,
};

static const struct of_device_id of_hantro_match[] = {
#ifdef CONFIG_VIDEO_HANTRO_ROCKCHIP
        { .compatible = "rockchip,rk3399-vpu", .data = &rk3399_vpu_variant, },
        { .compatible = "rockchip,rk3288-vpu", .data = &rk3288_vpu_variant, },
#endif
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, of_hantro_match);

static int hantro_register_entity(struct media_device *mdev,
                                  struct media_entity *entity,
                                  const char *entity_name,
                                  struct media_pad *pads, int num_pads,
                                  int function, struct video_device *vdev)
{
        char *name;
        int ret;

        entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
        if (function == MEDIA_ENT_F_IO_V4L) {
                entity->info.dev.major = VIDEO_MAJOR;
                entity->info.dev.minor = vdev->minor;
        }

        name = devm_kasprintf(mdev->dev, GFP_KERNEL, "%s-%s", vdev->name,
                              entity_name);
        if (!name)
                return -ENOMEM;

        entity->name = name;
        entity->function = function;

        ret = media_entity_pads_init(entity, num_pads, pads);
        if (ret)
                return ret;

        ret = media_device_register_entity(mdev, entity);
        if (ret)
                return ret;

        return 0;
}

static int hantro_attach_func(struct hantro_dev *vpu,
                              struct hantro_func *func)
{
        struct media_device *mdev = &vpu->mdev;
        struct media_link *link;
        int ret;

        /* Create the three encoder entities with their pads */
        func->source_pad.flags = MEDIA_PAD_FL_SOURCE;
        ret = hantro_register_entity(mdev, &func->vdev.entity, "source",
                                     &func->source_pad, 1, MEDIA_ENT_F_IO_V4L,
                                     &func->vdev);
        if (ret)
                return ret;

        func->proc_pads[0].flags = MEDIA_PAD_FL_SINK;
        func->proc_pads[1].flags = MEDIA_PAD_FL_SOURCE;
        ret = hantro_register_entity(mdev, &func->proc, "proc",
                                     func->proc_pads, 2, func->id,
                                     &func->vdev);
        if (ret)
                goto err_rel_entity0;

        func->sink_pad.flags = MEDIA_PAD_FL_SINK;
        ret = hantro_register_entity(mdev, &func->sink, "sink",
                                     &func->sink_pad, 1, MEDIA_ENT_F_IO_V4L,
                                     &func->vdev);
        if (ret)
                goto err_rel_entity1;

        /* Connect the three entities */
        ret = media_create_pad_link(&func->vdev.entity, 0, &func->proc, 1,
                                    MEDIA_LNK_FL_IMMUTABLE |
                                    MEDIA_LNK_FL_ENABLED);
        if (ret)
                goto err_rel_entity2;

        ret = media_create_pad_link(&func->proc, 0, &func->sink, 0,
                                    MEDIA_LNK_FL_IMMUTABLE |
                                    MEDIA_LNK_FL_ENABLED);
        if (ret)
                goto err_rm_links0;

        /* Create video interface */
        func->intf_devnode = media_devnode_create(mdev, MEDIA_INTF_T_V4L_VIDEO,
                                                  0, VIDEO_MAJOR,
                                                  func->vdev.minor);
        if (!func->intf_devnode) {
                ret = -ENOMEM;
                goto err_rm_links1;
        }

        /* Connect the two DMA engines to the interface */
        link = media_create_intf_link(&func->vdev.entity,
                                      &func->intf_devnode->intf,
                                      MEDIA_LNK_FL_IMMUTABLE |
                                      MEDIA_LNK_FL_ENABLED);
        if (!link) {
                ret = -ENOMEM;
                goto err_rm_devnode;
        }

        link = media_create_intf_link(&func->sink, &func->intf_devnode->intf,
                                      MEDIA_LNK_FL_IMMUTABLE |
                                      MEDIA_LNK_FL_ENABLED);
        if (!link) {
                ret = -ENOMEM;
                goto err_rm_devnode;
        }
        return 0;

err_rm_devnode:
        media_devnode_remove(func->intf_devnode);

err_rm_links1:
        media_entity_remove_links(&func->sink);

err_rm_links0:
        media_entity_remove_links(&func->proc);
        media_entity_remove_links(&func->vdev.entity);

err_rel_entity2:
        media_device_unregister_entity(&func->sink);

err_rel_entity1:
        media_device_unregister_entity(&func->proc);

err_rel_entity0:
        media_device_unregister_entity(&func->vdev.entity);
        return ret;
}

static void hantro_detach_func(struct hantro_func *func)
{
        media_devnode_remove(func->intf_devnode);
        media_entity_remove_links(&func->sink);
        media_entity_remove_links(&func->proc);
        media_entity_remove_links(&func->vdev.entity);
        media_device_unregister_entity(&func->sink);
        media_device_unregister_entity(&func->proc);
        media_device_unregister_entity(&func->vdev.entity);
}

static int hantro_add_func(struct hantro_dev *vpu, unsigned int funcid)
{
        const struct of_device_id *match;
        struct hantro_func *func;
        struct video_device *vfd;
        int ret;

        match = of_match_node(of_hantro_match, vpu->dev->of_node);
        func = devm_kzalloc(vpu->dev, sizeof(*func), GFP_KERNEL);
        if (!func) {
                v4l2_err(&vpu->v4l2_dev, "Failed to allocate video device\n");
                return -ENOMEM;
        }

        func->id = funcid;

        vfd = &func->vdev;
        vfd->fops = &hantro_fops;
        vfd->release = video_device_release_empty;
        vfd->lock = &vpu->vpu_mutex;
        vfd->v4l2_dev = &vpu->v4l2_dev;
        vfd->vfl_dir = VFL_DIR_M2M;
        vfd->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
        vfd->ioctl_ops = &hantro_ioctl_ops;
        snprintf(vfd->name, sizeof(vfd->name), "%s-%s", match->compatible,
                 funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER ? "enc" : "dec");

        if (funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER)
                vpu->encoder = func;
        else
                vpu->decoder = func;

        video_set_drvdata(vfd, vpu);

        ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
        if (ret) {
                v4l2_err(&vpu->v4l2_dev, "Failed to register video device\n");
                return ret;
        }

        ret = hantro_attach_func(vpu, func);
        if (ret) {
                v4l2_err(&vpu->v4l2_dev,
                         "Failed to attach functionality to the media device\n");
                goto err_unreg_dev;
        }

        v4l2_info(&vpu->v4l2_dev, "registered %s as /dev/video%d\n", vfd->name,
                  vfd->num);

        return 0;

err_unreg_dev:
        video_unregister_device(vfd);
        return ret;
}

static int hantro_add_enc_func(struct hantro_dev *vpu)
{
        if (!vpu->variant->enc_fmts)
                return 0;

        return hantro_add_func(vpu, MEDIA_ENT_F_PROC_VIDEO_ENCODER);
}

static int hantro_add_dec_func(struct hantro_dev *vpu)
{
        if (!vpu->variant->dec_fmts)
                return 0;

        return hantro_add_func(vpu, MEDIA_ENT_F_PROC_VIDEO_DECODER);
}

static void hantro_remove_func(struct hantro_dev *vpu,
                               unsigned int funcid)
{
        struct hantro_func *func;

        if (funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER)
                func = vpu->encoder;
        else
                func = vpu->decoder;

        if (!func)
                return;

        hantro_detach_func(func);
        video_unregister_device(&func->vdev);
}

static void hantro_remove_enc_func(struct hantro_dev *vpu)
{
        hantro_remove_func(vpu, MEDIA_ENT_F_PROC_VIDEO_ENCODER);
}

static void hantro_remove_dec_func(struct hantro_dev *vpu)
{
        hantro_remove_func(vpu, MEDIA_ENT_F_PROC_VIDEO_DECODER);
}

static const struct media_device_ops hantro_m2m_media_ops = {
        .req_validate = vb2_request_validate,
        .req_queue = v4l2_m2m_request_queue,
};

static int hantro_probe(struct platform_device *pdev)
{
        const struct of_device_id *match;
        struct hantro_dev *vpu;
        struct resource *res;
        int num_bases;
        int i, ret;

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

        vpu->dev = &pdev->dev;
        vpu->pdev = pdev;
        mutex_init(&vpu->vpu_mutex);
        spin_lock_init(&vpu->irqlock);

        match = of_match_node(of_hantro_match, pdev->dev.of_node);
        vpu->variant = match->data;

        INIT_DELAYED_WORK(&vpu->watchdog_work, hantro_watchdog);

        vpu->clocks = devm_kcalloc(&pdev->dev, vpu->variant->num_clocks,
                                   sizeof(*vpu->clocks), GFP_KERNEL);
        if (!vpu->clocks)
                return -ENOMEM;

        for (i = 0; i < vpu->variant->num_clocks; i++)
                vpu->clocks[i].id = vpu->variant->clk_names[i];
        ret = devm_clk_bulk_get(&pdev->dev, vpu->variant->num_clocks,
                                vpu->clocks);
        if (ret)
                return ret;

        num_bases = vpu->variant->num_regs ?: 1;
        vpu->reg_bases = devm_kcalloc(&pdev->dev, num_bases,
                                      sizeof(*vpu->reg_bases), GFP_KERNEL);
        if (!vpu->reg_bases)
                return -ENOMEM;

        for (i = 0; i < num_bases; i++) {
                res = vpu->variant->reg_names ?
                      platform_get_resource_byname(vpu->pdev, IORESOURCE_MEM,
                                                   vpu->variant->reg_names[i]) :
                      platform_get_resource(vpu->pdev, IORESOURCE_MEM, 0);
                vpu->reg_bases[i] = devm_ioremap_resource(vpu->dev, res);
                if (IS_ERR(vpu->reg_bases[i]))
                        return PTR_ERR(vpu->reg_bases[i]);
        }
        vpu->enc_base = vpu->reg_bases[0] + vpu->variant->enc_offset;
        vpu->dec_base = vpu->reg_bases[0] + vpu->variant->dec_offset;

        ret = dma_set_coherent_mask(vpu->dev, DMA_BIT_MASK(32));
        if (ret) {
                dev_err(vpu->dev, "Could not set DMA coherent mask.\n");
                return ret;
        }

        for (i = 0; i < vpu->variant->num_irqs; i++) {
                const char *irq_name = vpu->variant->irqs[i].name;
                int irq;

                if (!vpu->variant->irqs[i].handler)
                        continue;

                irq = platform_get_irq_byname(vpu->pdev, irq_name);
                if (irq <= 0) {
                        dev_err(vpu->dev, "Could not get %s IRQ.\n", irq_name);
                        return -ENXIO;
                }

                ret = devm_request_irq(vpu->dev, irq,
                                       vpu->variant->irqs[i].handler, 0,
                                       dev_name(vpu->dev), vpu);
                if (ret) {
                        dev_err(vpu->dev, "Could not request %s IRQ.\n",
                                irq_name);
                        return ret;
                }
        }

        ret = vpu->variant->init(vpu);
        if (ret) {
                dev_err(&pdev->dev, "Failed to init VPU hardware\n");
                return ret;
        }

        pm_runtime_set_autosuspend_delay(vpu->dev, 100);
        pm_runtime_use_autosuspend(vpu->dev);
        pm_runtime_enable(vpu->dev);

        ret = clk_bulk_prepare(vpu->variant->num_clocks, vpu->clocks);
        if (ret) {
                dev_err(&pdev->dev, "Failed to prepare clocks\n");
                return ret;
        }

        ret = v4l2_device_register(&pdev->dev, &vpu->v4l2_dev);
        if (ret) {
                dev_err(&pdev->dev, "Failed to register v4l2 device\n");
                goto err_clk_unprepare;
        }
        platform_set_drvdata(pdev, vpu);

        vpu->m2m_dev = v4l2_m2m_init(&vpu_m2m_ops);
        if (IS_ERR(vpu->m2m_dev)) {
                v4l2_err(&vpu->v4l2_dev, "Failed to init mem2mem device\n");
                ret = PTR_ERR(vpu->m2m_dev);
                goto err_v4l2_unreg;
        }

        vpu->mdev.dev = vpu->dev;
        strscpy(vpu->mdev.model, DRIVER_NAME, sizeof(vpu->mdev.model));
        strscpy(vpu->mdev.bus_info, "platform: " DRIVER_NAME,
                sizeof(vpu->mdev.model));
        media_device_init(&vpu->mdev);
        vpu->mdev.ops = &hantro_m2m_media_ops;
        vpu->v4l2_dev.mdev = &vpu->mdev;

        ret = hantro_add_enc_func(vpu);
        if (ret) {
                dev_err(&pdev->dev, "Failed to register encoder\n");
                goto err_m2m_rel;
        }

        ret = hantro_add_dec_func(vpu);
        if (ret) {
                dev_err(&pdev->dev, "Failed to register decoder\n");
                goto err_rm_enc_func;
        }

        ret = media_device_register(&vpu->mdev);
        if (ret) {
                v4l2_err(&vpu->v4l2_dev, "Failed to register mem2mem media device\n");
                goto err_rm_dec_func;
        }

        return 0;

err_rm_dec_func:
        hantro_remove_dec_func(vpu);
err_rm_enc_func:
        hantro_remove_enc_func(vpu);
err_m2m_rel:
        media_device_cleanup(&vpu->mdev);
        v4l2_m2m_release(vpu->m2m_dev);
err_v4l2_unreg:
        v4l2_device_unregister(&vpu->v4l2_dev);
err_clk_unprepare:
        clk_bulk_unprepare(vpu->variant->num_clocks, vpu->clocks);
        pm_runtime_dont_use_autosuspend(vpu->dev);
        pm_runtime_disable(vpu->dev);
        return ret;
}

static int hantro_remove(struct platform_device *pdev)
{
        struct hantro_dev *vpu = platform_get_drvdata(pdev);

        v4l2_info(&vpu->v4l2_dev, "Removing %s\n", pdev->name);

        media_device_unregister(&vpu->mdev);
        hantro_remove_dec_func(vpu);
        hantro_remove_enc_func(vpu);
        media_device_cleanup(&vpu->mdev);
        v4l2_m2m_release(vpu->m2m_dev);
        v4l2_device_unregister(&vpu->v4l2_dev);
        clk_bulk_unprepare(vpu->variant->num_clocks, vpu->clocks);
        pm_runtime_dont_use_autosuspend(vpu->dev);
        pm_runtime_disable(vpu->dev);
        return 0;
}

#ifdef CONFIG_PM
static int hantro_runtime_resume(struct device *dev)
{
        struct hantro_dev *vpu = dev_get_drvdata(dev);

        if (vpu->variant->runtime_resume)
                return vpu->variant->runtime_resume(vpu);

        return 0;
}
#endif

static const struct dev_pm_ops hantro_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
                                pm_runtime_force_resume)
        SET_RUNTIME_PM_OPS(NULL, hantro_runtime_resume, NULL)
};

static struct platform_driver hantro_driver = {
        .probe = hantro_probe,
        .remove = hantro_remove,
        .driver = {
                   .name = DRIVER_NAME,
                   .of_match_table = of_match_ptr(of_hantro_match),
                   .pm = &hantro_pm_ops,
        },
};
module_platform_driver(hantro_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Alpha Lin <Alpha.Lin@Rock-Chips.com>");
MODULE_AUTHOR("Tomasz Figa <tfiga@chromium.org>");
MODULE_AUTHOR("Ezequiel Garcia <ezequiel@collabora.com>");
MODULE_DESCRIPTION("Hantro VPU codec driver");