g2d.c

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/*
 * Samsung S5P G2D - 2D Graphics Accelerator Driver
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Kamil Debski, <[email protected]>
 *
 * 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/fs.h>
#include <linux/version.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/interrupt.h>

#include <linux/platform_device.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>

#include "g2d.h"
#include "g2d-regs.h"

#define fh2ctx(__fh) container_of(__fh, struct g2d_ctx, fh)

static struct g2d_fmt formats[] = {
    {
        .name   = "XRGB_8888",
        .fourcc = V4L2_PIX_FMT_RGB32,
        .depth  = 32,
        .hw = COLOR_MODE(ORDER_XRGB, MODE_XRGB_8888),
    },
    {
        .name   = "RGB_565",
        .fourcc = V4L2_PIX_FMT_RGB565X,
        .depth  = 16,
        .hw = COLOR_MODE(ORDER_XRGB, MODE_RGB_565),
    },
    {
        .name   = "XRGB_1555",
        .fourcc = V4L2_PIX_FMT_RGB555X,
        .depth  = 16,
        .hw = COLOR_MODE(ORDER_XRGB, MODE_XRGB_1555),
    },
    {
        .name   = "XRGB_4444",
        .fourcc = V4L2_PIX_FMT_RGB444,
        .depth  = 16,
        .hw = COLOR_MODE(ORDER_XRGB, MODE_XRGB_4444),
    },
    {
        .name   = "PACKED_RGB_888",
        .fourcc = V4L2_PIX_FMT_RGB24,
        .depth  = 24,
        .hw = COLOR_MODE(ORDER_XRGB, MODE_PACKED_RGB_888),
    },
};
#define NUM_FORMATS ARRAY_SIZE(formats)

static struct g2d_frame def_frame = {
    .width      = DEFAULT_WIDTH,
    .height     = DEFAULT_HEIGHT,
    .c_width    = DEFAULT_WIDTH,
    .c_height   = DEFAULT_HEIGHT,
    .o_width    = 0,
    .o_height   = 0,
    .fmt        = &formats[0],
    .right      = DEFAULT_WIDTH,
    .bottom     = DEFAULT_HEIGHT,
};

static struct g2d_fmt *find_fmt(struct v4l2_format *f)
{
    unsigned int i;
    for (i = 0; i < NUM_FORMATS; i++) {
        if (formats[i].fourcc == f->fmt.pix.pixelformat)
            return &formats[i];
    }
    return NULL;
}


static struct g2d_frame *get_frame(struct g2d_ctx *ctx,
                            enum v4l2_buf_type type)
{
    switch (type) {
    case V4L2_BUF_TYPE_VIDEO_OUTPUT:
        return &ctx->in;
    case V4L2_BUF_TYPE_VIDEO_CAPTURE:
        return &ctx->out;
    default:
        return ERR_PTR(-EINVAL);
    }
}

static int g2d_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
               unsigned int *nbuffers, unsigned int *nplanes,
               unsigned int sizes[], void *alloc_ctxs[])
{
    struct g2d_ctx *ctx = vb2_get_drv_priv(vq);
    struct g2d_frame *f = get_frame(ctx, vq->type);

    if (IS_ERR(f))
        return PTR_ERR(f);

    sizes[0] = f->size;
    *nplanes = 1;
    alloc_ctxs[0] = ctx->dev->alloc_ctx;

    if (*nbuffers == 0)
        *nbuffers = 1;

    return 0;
}

static int g2d_buf_prepare(struct vb2_buffer *vb)
{
    struct g2d_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
    struct g2d_frame *f = get_frame(ctx, vb->vb2_queue->type);

    if (IS_ERR(f))
        return PTR_ERR(f);
    vb2_set_plane_payload(vb, 0, f->size);
    return 0;
}

static void g2d_buf_queue(struct vb2_buffer *vb)
{
    struct g2d_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
    v4l2_m2m_buf_queue(ctx->m2m_ctx, vb);
}


static struct vb2_ops g2d_qops = {
    .queue_setup    = g2d_queue_setup,
    .buf_prepare    = g2d_buf_prepare,
    .buf_queue  = g2d_buf_queue,
};

static int queue_init(void *priv, struct vb2_queue *src_vq,
                        struct vb2_queue *dst_vq)
{
    struct g2d_ctx *ctx = priv;
    int ret;

    src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
    src_vq->io_modes = VB2_MMAP | VB2_USERPTR;
    src_vq->drv_priv = ctx;
    src_vq->ops = &g2d_qops;
    src_vq->mem_ops = &vb2_dma_contig_memops;
    src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);

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

    dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    dst_vq->io_modes = VB2_MMAP | VB2_USERPTR;
    dst_vq->drv_priv = ctx;
    dst_vq->ops = &g2d_qops;
    dst_vq->mem_ops = &vb2_dma_contig_memops;
    dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);

    return vb2_queue_init(dst_vq);
}

static int g2d_s_ctrl(struct v4l2_ctrl *ctrl)
{
    struct g2d_ctx *ctx = container_of(ctrl->handler, struct g2d_ctx,
                                ctrl_handler);
    unsigned long flags;

    spin_lock_irqsave(&ctx->dev->ctrl_lock, flags);
    switch (ctrl->id) {
    case V4L2_CID_COLORFX:
        if (ctrl->val == V4L2_COLORFX_NEGATIVE)
            ctx->rop = ROP4_INVERT;
        else
            ctx->rop = ROP4_COPY;
        break;

    case V4L2_CID_HFLIP:
        ctx->flip = ctx->ctrl_hflip->val | (ctx->ctrl_vflip->val << 1);
        break;

    }
    spin_unlock_irqrestore(&ctx->dev->ctrl_lock, flags);
    return 0;
}

static const struct v4l2_ctrl_ops g2d_ctrl_ops = {
    .s_ctrl     = g2d_s_ctrl,
};

static int g2d_setup_ctrls(struct g2d_ctx *ctx)
{
    struct g2d_dev *dev = ctx->dev;

    v4l2_ctrl_handler_init(&ctx->ctrl_handler, 3);

    ctx->ctrl_hflip = v4l2_ctrl_new_std(&ctx->ctrl_handler, &g2d_ctrl_ops,
                        V4L2_CID_HFLIP, 0, 1, 1, 0);

    ctx->ctrl_vflip = v4l2_ctrl_new_std(&ctx->ctrl_handler, &g2d_ctrl_ops,
                        V4L2_CID_VFLIP, 0, 1, 1, 0);

    v4l2_ctrl_new_std_menu(
        &ctx->ctrl_handler,
        &g2d_ctrl_ops,
        V4L2_CID_COLORFX,
        V4L2_COLORFX_NEGATIVE,
        ~((1 << V4L2_COLORFX_NONE) | (1 << V4L2_COLORFX_NEGATIVE)),
        V4L2_COLORFX_NONE);

    if (ctx->ctrl_handler.error) {
        int err = ctx->ctrl_handler.error;
        v4l2_err(&dev->v4l2_dev, "g2d_setup_ctrls failed\n");
        v4l2_ctrl_handler_free(&ctx->ctrl_handler);
        return err;
    }

    v4l2_ctrl_cluster(2, &ctx->ctrl_hflip);

    return 0;
}

static int g2d_open(struct file *file)
{
    struct g2d_dev *dev = video_drvdata(file);
    struct g2d_ctx *ctx = NULL;
    int ret = 0;

    ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
    if (!ctx)
        return -ENOMEM;
    ctx->dev = dev;
    /* Set default formats */
    ctx->in     = def_frame;
    ctx->out    = def_frame;

    if (mutex_lock_interruptible(&dev->mutex)) {
        kfree(ctx);
        return -ERESTARTSYS;
    }
    ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
    if (IS_ERR(ctx->m2m_ctx)) {
        ret = PTR_ERR(ctx->m2m_ctx);
        mutex_unlock(&dev->mutex);
        kfree(ctx);
        return ret;
    }
    v4l2_fh_init(&ctx->fh, video_devdata(file));
    file->private_data = &ctx->fh;
    v4l2_fh_add(&ctx->fh);

    g2d_setup_ctrls(ctx);

    /* Write the default values to the ctx struct */
    v4l2_ctrl_handler_setup(&ctx->ctrl_handler);

    ctx->fh.ctrl_handler = &ctx->ctrl_handler;
    mutex_unlock(&dev->mutex);

    v4l2_info(&dev->v4l2_dev, "instance opened\n");
    return 0;
}

static int g2d_release(struct file *file)
{
    struct g2d_dev *dev = video_drvdata(file);
    struct g2d_ctx *ctx = fh2ctx(file->private_data);

    v4l2_ctrl_handler_free(&ctx->ctrl_handler);
    v4l2_fh_del(&ctx->fh);
    v4l2_fh_exit(&ctx->fh);
    kfree(ctx);
    v4l2_info(&dev->v4l2_dev, "instance closed\n");
    return 0;
}


static int vidioc_querycap(struct file *file, void *priv,
                struct v4l2_capability *cap)
{
    strncpy(cap->driver, G2D_NAME, sizeof(cap->driver) - 1);
    strncpy(cap->card, G2D_NAME, sizeof(cap->card) - 1);
    cap->bus_info[0] = 0;
    cap->version = KERNEL_VERSION(1, 0, 0);
    /*
     * This is only a mem-to-mem video device. The capture and output
     * device capability flags are left only for backward compatibility
     * and are scheduled for removal.
     */
    cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT |
                V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
    return 0;
}

static int vidioc_enum_fmt(struct file *file, void *prv, struct v4l2_fmtdesc *f)
{
    struct g2d_fmt *fmt;
    if (f->index >= NUM_FORMATS)
        return -EINVAL;
    fmt = &formats[f->index];
    f->pixelformat = fmt->fourcc;
    strncpy(f->description, fmt->name, sizeof(f->description) - 1);
    return 0;
}

static int vidioc_g_fmt(struct file *file, void *prv, struct v4l2_format *f)
{
    struct g2d_ctx *ctx = prv;
    struct vb2_queue *vq;
    struct g2d_frame *frm;

    vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
    if (!vq)
        return -EINVAL;
    frm = get_frame(ctx, f->type);
    if (IS_ERR(frm))
        return PTR_ERR(frm);

    f->fmt.pix.width        = frm->width;
    f->fmt.pix.height       = frm->height;
    f->fmt.pix.field        = V4L2_FIELD_NONE;
    f->fmt.pix.pixelformat      = frm->fmt->fourcc;
    f->fmt.pix.bytesperline     = (frm->width * frm->fmt->depth) >> 3;
    f->fmt.pix.sizeimage        = frm->size;
    return 0;
}

static int vidioc_try_fmt(struct file *file, void *prv, struct v4l2_format *f)
{
    struct g2d_fmt *fmt;
    enum v4l2_field *field;

    fmt = find_fmt(f);
    if (!fmt)
        return -EINVAL;

    field = &f->fmt.pix.field;
    if (*field == V4L2_FIELD_ANY)
        *field = V4L2_FIELD_NONE;
    else if (*field != V4L2_FIELD_NONE)
        return -EINVAL;

    if (f->fmt.pix.width > MAX_WIDTH)
        f->fmt.pix.width = MAX_WIDTH;
    if (f->fmt.pix.height > MAX_HEIGHT)
        f->fmt.pix.height = MAX_HEIGHT;

    if (f->fmt.pix.width < 1)
        f->fmt.pix.width = 1;
    if (f->fmt.pix.height < 1)
        f->fmt.pix.height = 1;

    f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
    f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
    return 0;
}

static int vidioc_s_fmt(struct file *file, void *prv, struct v4l2_format *f)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_dev *dev = ctx->dev;
    struct vb2_queue *vq;
    struct g2d_frame *frm;
    struct g2d_fmt *fmt;
    int ret = 0;

    /* Adjust all values accordingly to the hardware capabilities
     * and chosen format. */
    ret = vidioc_try_fmt(file, prv, f);
    if (ret)
        return ret;
    vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
    if (vb2_is_busy(vq)) {
        v4l2_err(&dev->v4l2_dev, "queue (%d) bust\n", f->type);
        return -EBUSY;
    }
    frm = get_frame(ctx, f->type);
    if (IS_ERR(frm))
        return PTR_ERR(frm);
    fmt = find_fmt(f);
    if (!fmt)
        return -EINVAL;
    frm->width  = f->fmt.pix.width;
    frm->height = f->fmt.pix.height;
    frm->size   = f->fmt.pix.sizeimage;
    /* Reset crop settings */
    frm->o_width    = 0;
    frm->o_height   = 0;
    frm->c_width    = frm->width;
    frm->c_height   = frm->height;
    frm->right  = frm->width;
    frm->bottom = frm->height;
    frm->fmt    = fmt;
    frm->stride = f->fmt.pix.bytesperline;
    return 0;
}

static unsigned int g2d_poll(struct file *file, struct poll_table_struct *wait)
{
    struct g2d_ctx *ctx = fh2ctx(file->private_data);
    struct g2d_dev *dev = ctx->dev;
    unsigned int res;

    mutex_lock(&dev->mutex);
    res = v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
    mutex_unlock(&dev->mutex);
    return res;
}

static int g2d_mmap(struct file *file, struct vm_area_struct *vma)
{
    struct g2d_ctx *ctx = fh2ctx(file->private_data);
    struct g2d_dev *dev = ctx->dev;
    int ret;

    if (mutex_lock_interruptible(&dev->mutex))
        return -ERESTARTSYS;
    ret = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
    mutex_unlock(&dev->mutex);
    return ret;
}

static int vidioc_reqbufs(struct file *file, void *priv,
            struct v4l2_requestbuffers *reqbufs)
{
    struct g2d_ctx *ctx = priv;
    return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
}

static int vidioc_querybuf(struct file *file, void *priv,
            struct v4l2_buffer *buf)
{
    struct g2d_ctx *ctx = priv;
    return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
}

static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
{
    struct g2d_ctx *ctx = priv;
    return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
}

static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
{
    struct g2d_ctx *ctx = priv;
    return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
}


static int vidioc_streamon(struct file *file, void *priv,
                    enum v4l2_buf_type type)
{
    struct g2d_ctx *ctx = priv;
    return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
}

static int vidioc_streamoff(struct file *file, void *priv,
                    enum v4l2_buf_type type)
{
    struct g2d_ctx *ctx = priv;
    return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
}

static int vidioc_cropcap(struct file *file, void *priv,
                    struct v4l2_cropcap *cr)
{
    struct g2d_ctx *ctx = priv;
    struct g2d_frame *f;

    f = get_frame(ctx, cr->type);
    if (IS_ERR(f))
        return PTR_ERR(f);

    cr->bounds.left     = 0;
    cr->bounds.top      = 0;
    cr->bounds.width    = f->width;
    cr->bounds.height   = f->height;
    cr->defrect     = cr->bounds;
    return 0;
}

static int vidioc_g_crop(struct file *file, void *prv, struct v4l2_crop *cr)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_frame *f;

    f = get_frame(ctx, cr->type);
    if (IS_ERR(f))
        return PTR_ERR(f);

    cr->c.left  = f->o_height;
    cr->c.top   = f->o_width;
    cr->c.width = f->c_width;
    cr->c.height    = f->c_height;
    return 0;
}

static int vidioc_try_crop(struct file *file, void *prv, const struct v4l2_crop *cr)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_dev *dev = ctx->dev;
    struct g2d_frame *f;

    f = get_frame(ctx, cr->type);
    if (IS_ERR(f))
        return PTR_ERR(f);

    if (cr->c.top < 0 || cr->c.left < 0) {
        v4l2_err(&dev->v4l2_dev,
            "doesn't support negative values for top & left\n");
        return -EINVAL;
    }

    return 0;
}

static int vidioc_s_crop(struct file *file, void *prv, const struct v4l2_crop *cr)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_frame *f;
    int ret;

    ret = vidioc_try_crop(file, prv, cr);
    if (ret)
        return ret;
    f = get_frame(ctx, cr->type);
    if (IS_ERR(f))
        return PTR_ERR(f);

    f->c_width  = cr->c.width;
    f->c_height = cr->c.height;
    f->o_width  = cr->c.left;
    f->o_height = cr->c.top;
    f->bottom   = f->o_height + f->c_height;
    f->right    = f->o_width + f->c_width;
    return 0;
}

static void g2d_lock(void *prv)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_dev *dev = ctx->dev;
    mutex_lock(&dev->mutex);
}

static void g2d_unlock(void *prv)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_dev *dev = ctx->dev;
    mutex_unlock(&dev->mutex);
}

static void job_abort(void *prv)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_dev *dev = ctx->dev;
    int ret;

    if (dev->curr == NULL) /* No job currently running */
        return;

    ret = wait_event_timeout(dev->irq_queue,
        dev->curr == NULL,
        msecs_to_jiffies(G2D_TIMEOUT));
}

static void device_run(void *prv)
{
    struct g2d_ctx *ctx = prv;
    struct g2d_dev *dev = ctx->dev;
    struct vb2_buffer *src, *dst;
    unsigned long flags;
    u32 cmd = 0;

    dev->curr = ctx;

    src = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
    dst = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);

    clk_enable(dev->gate);
    g2d_reset(dev);

    spin_lock_irqsave(&dev->ctrl_lock, flags);

    g2d_set_src_size(dev, &ctx->in);
    g2d_set_src_addr(dev, vb2_dma_contig_plane_dma_addr(src, 0));

    g2d_set_dst_size(dev, &ctx->out);
    g2d_set_dst_addr(dev, vb2_dma_contig_plane_dma_addr(dst, 0));

    g2d_set_rop4(dev, ctx->rop);
    g2d_set_flip(dev, ctx->flip);

    if (ctx->in.c_width != ctx->out.c_width ||
        ctx->in.c_height != ctx->out.c_height)
        cmd |= g2d_cmd_stretch(1);
    g2d_set_cmd(dev, cmd);
    g2d_start(dev);

    spin_unlock_irqrestore(&dev->ctrl_lock, flags);
}

static irqreturn_t g2d_isr(int irq, void *prv)
{
    struct g2d_dev *dev = prv;
    struct g2d_ctx *ctx = dev->curr;
    struct vb2_buffer *src, *dst;

    g2d_clear_int(dev);
    clk_disable(dev->gate);

    BUG_ON(ctx == NULL);

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

    BUG_ON(src == NULL);
    BUG_ON(dst == NULL);

    v4l2_m2m_buf_done(src, VB2_BUF_STATE_DONE);
    v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE);
    v4l2_m2m_job_finish(dev->m2m_dev, ctx->m2m_ctx);

    dev->curr = NULL;
    wake_up(&dev->irq_queue);
    return IRQ_HANDLED;
}

static const struct v4l2_file_operations g2d_fops = {
    .owner      = THIS_MODULE,
    .open       = g2d_open,
    .release    = g2d_release,
    .poll       = g2d_poll,
    .unlocked_ioctl = video_ioctl2,
    .mmap       = g2d_mmap,
};

static const struct v4l2_ioctl_ops g2d_ioctl_ops = {
    .vidioc_querycap    = vidioc_querycap,

    .vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt,
    .vidioc_g_fmt_vid_cap       = vidioc_g_fmt,
    .vidioc_try_fmt_vid_cap     = vidioc_try_fmt,
    .vidioc_s_fmt_vid_cap       = vidioc_s_fmt,

    .vidioc_enum_fmt_vid_out    = vidioc_enum_fmt,
    .vidioc_g_fmt_vid_out       = vidioc_g_fmt,
    .vidioc_try_fmt_vid_out     = vidioc_try_fmt,
    .vidioc_s_fmt_vid_out       = vidioc_s_fmt,

    .vidioc_reqbufs         = vidioc_reqbufs,
    .vidioc_querybuf        = vidioc_querybuf,

    .vidioc_qbuf            = vidioc_qbuf,
    .vidioc_dqbuf           = vidioc_dqbuf,

    .vidioc_streamon        = vidioc_streamon,
    .vidioc_streamoff       = vidioc_streamoff,

    .vidioc_g_crop          = vidioc_g_crop,
    .vidioc_s_crop          = vidioc_s_crop,
    .vidioc_cropcap         = vidioc_cropcap,
};

static struct video_device g2d_videodev = {
    .name       = G2D_NAME,
    .fops       = &g2d_fops,
    .ioctl_ops  = &g2d_ioctl_ops,
    .minor      = -1,
    .release    = video_device_release,
    .vfl_dir    = VFL_DIR_M2M,
};

static struct v4l2_m2m_ops g2d_m2m_ops = {
    .device_run = device_run,
    .job_abort  = job_abort,
    .lock       = g2d_lock,
    .unlock     = g2d_unlock,
};

static int g2d_probe(struct platform_device *pdev)
{
    struct g2d_dev *dev;
    struct video_device *vfd;
    struct resource *res;
    int ret = 0;

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

    spin_lock_init(&dev->ctrl_lock);
    mutex_init(&dev->mutex);
    atomic_set(&dev->num_inst, 0);
    init_waitqueue_head(&dev->irq_queue);

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

    dev->regs = devm_request_and_ioremap(&pdev->dev, res);
    if (dev->regs == NULL) {
            dev_err(&pdev->dev, "Failed to obtain io memory\n");
            return -ENOENT;
    }

    dev->clk = clk_get(&pdev->dev, "sclk_fimg2d");
    if (IS_ERR_OR_NULL(dev->clk)) {
        dev_err(&pdev->dev, "failed to get g2d clock\n");
        return -ENXIO;
    }

    ret = clk_prepare(dev->clk);
    if (ret) {
        dev_err(&pdev->dev, "failed to prepare g2d clock\n");
        goto put_clk;
    }

    dev->gate = clk_get(&pdev->dev, "fimg2d");
    if (IS_ERR_OR_NULL(dev->gate)) {
        dev_err(&pdev->dev, "failed to get g2d clock gate\n");
        ret = -ENXIO;
        goto unprep_clk;
    }

    ret = clk_prepare(dev->gate);
    if (ret) {
        dev_err(&pdev->dev, "failed to prepare g2d clock gate\n");
        goto put_clk_gate;
    }

    res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (!res) {
        dev_err(&pdev->dev, "failed to find IRQ\n");
        ret = -ENXIO;
        goto unprep_clk_gate;
    }

    dev->irq = res->start;

    ret = devm_request_irq(&pdev->dev, dev->irq, g2d_isr,
                        0, pdev->name, dev);
    if (ret) {
        dev_err(&pdev->dev, "failed to install IRQ\n");
        goto put_clk_gate;
    }

    dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
    if (IS_ERR(dev->alloc_ctx)) {
        ret = PTR_ERR(dev->alloc_ctx);
        goto unprep_clk_gate;
    }

    ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
    if (ret)
        goto alloc_ctx_cleanup;
    vfd = video_device_alloc();
    if (!vfd) {
        v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
        ret = -ENOMEM;
        goto unreg_v4l2_dev;
    }
    *vfd = g2d_videodev;
    vfd->lock = &dev->mutex;
    ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
    if (ret) {
        v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
        goto rel_vdev;
    }
    video_set_drvdata(vfd, dev);
    snprintf(vfd->name, sizeof(vfd->name), "%s", g2d_videodev.name);
    dev->vfd = vfd;
    v4l2_info(&dev->v4l2_dev, "device registered as /dev/video%d\n",
                                vfd->num);
    platform_set_drvdata(pdev, dev);
    dev->m2m_dev = v4l2_m2m_init(&g2d_m2m_ops);
    if (IS_ERR(dev->m2m_dev)) {
        v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
        ret = PTR_ERR(dev->m2m_dev);
        goto unreg_video_dev;
    }

    def_frame.stride = (def_frame.width * def_frame.fmt->depth) >> 3;

    return 0;

unreg_video_dev:
    video_unregister_device(dev->vfd);
rel_vdev:
    video_device_release(vfd);
unreg_v4l2_dev:
    v4l2_device_unregister(&dev->v4l2_dev);
alloc_ctx_cleanup:
    vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
unprep_clk_gate:
    clk_unprepare(dev->gate);
put_clk_gate:
    clk_put(dev->gate);
unprep_clk:
    clk_unprepare(dev->clk);
put_clk:
    clk_put(dev->clk);

    return ret;
}

static int g2d_remove(struct platform_device *pdev)
{
    struct g2d_dev *dev = (struct g2d_dev *)platform_get_drvdata(pdev);

    v4l2_info(&dev->v4l2_dev, "Removing " G2D_NAME);
    v4l2_m2m_release(dev->m2m_dev);
    video_unregister_device(dev->vfd);
    v4l2_device_unregister(&dev->v4l2_dev);
    vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
    clk_unprepare(dev->gate);
    clk_put(dev->gate);
    clk_unprepare(dev->clk);
    clk_put(dev->clk);
    return 0;
}

static struct platform_driver g2d_pdrv = {
    .probe      = g2d_probe,
    .remove     = g2d_remove,
    .driver     = {
        .name = G2D_NAME,
        .owner = THIS_MODULE,
    },
};

module_platform_driver(g2d_pdrv);

MODULE_AUTHOR("Kamil Debski <[email protected]>");
MODULE_DESCRIPTION("S5P G2D 2d graphics accelerator driver");
MODULE_LICENSE("GPL");