text: /*
   * Samsung S5P G2D - 2D Graphics Accelerator Driver
   *
   * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   * Kamil Debski, <k.debski@samsung.com>
   *
   * 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/timer.h>
  #include <linux/sched.h>
  #include <linux/slab.h>
  #include <linux/clk.h>
  #include <linux/interrupt.h>
  #include <linux/of.h>
  
  #include <linux/platform_device.h>
  #include <media/v4l2-mem2mem.h>
  #include <media/v4l2-device.h>
  #include <media/v4l2-ioctl.h>
  #include <media/videobuf2-v4l2.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,
  			   unsigned int *nbuffers, unsigned int *nplanes,
  			   unsigned int sizes[], struct device *alloc_devs[])
  {
  	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;
  
  	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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct g2d_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
  }
  
  static const 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);
  	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
  	src_vq->lock = &ctx->dev->mutex;
  	src_vq->dev = ctx->dev->v4l2_dev.dev;
  
  	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);
  	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
  	dst_vq->lock = &ctx->dev->mutex;
  	dst_vq->dev = ctx->dev->v4l2_dev.dev;
  
  	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->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
  	if (IS_ERR(ctx->fh.m2m_ctx)) {
  		ret = PTR_ERR(ctx->fh.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->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
  	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
  	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->fh.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->fh.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 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 job_abort(void *prv)
  {
  	struct g2d_ctx *ctx = prv;
  	struct g2d_dev *dev = ctx->dev;
  
  	if (dev->curr == NULL) /* No job currently running */
  		return;
  
  	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->fh.m2m_ctx);
  	dst = v4l2_m2m_next_dst_buf(ctx->fh.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) {
  		if (dev->variant->hw_rev == TYPE_G2D_3X)
  			cmd |= CMD_V3_ENABLE_STRETCH;
  		else
  			g2d_set_v41_stretch(dev, &ctx->in, &ctx->out);
  	}
  
  	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_v4l2_buffer *src, *dst;
  
  	g2d_clear_int(dev);
  	clk_disable(dev->gate);
  
  	BUG_ON(ctx == NULL);
  
  	src = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
  	dst = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
  
  	BUG_ON(src == NULL);
  	BUG_ON(dst == NULL);
  
  	dst->timecode = src->timecode;
  	dst->vb2_buf.timestamp = src->vb2_buf.timestamp;
  	dst->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
  	dst->flags |=
  		src->flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
  
  	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->fh.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		= v4l2_m2m_fop_poll,
  	.unlocked_ioctl	= video_ioctl2,
  	.mmap		= v4l2_m2m_fop_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			= v4l2_m2m_ioctl_reqbufs,
  	.vidioc_querybuf		= v4l2_m2m_ioctl_querybuf,
  	.vidioc_qbuf			= v4l2_m2m_ioctl_qbuf,
  	.vidioc_dqbuf			= v4l2_m2m_ioctl_dqbuf,
  
  	.vidioc_streamon		= v4l2_m2m_ioctl_streamon,
  	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
  
  	.vidioc_g_crop			= vidioc_g_crop,
  	.vidioc_s_crop			= vidioc_s_crop,
  	.vidioc_cropcap			= vidioc_cropcap,
  };
  
  static const 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 const struct v4l2_m2m_ops g2d_m2m_ops = {
  	.device_run	= device_run,
  	.job_abort	= job_abort,
  };
  
  static const struct of_device_id exynos_g2d_match[];
  
  static int g2d_probe(struct platform_device *pdev)
  {
  	struct g2d_dev *dev;
  	struct video_device *vfd;
  	struct resource *res;
  	const struct of_device_id *of_id;
  	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_ioremap_resource(&pdev->dev, res);
  	if (IS_ERR(dev->regs))
  		return PTR_ERR(dev->regs);
  
  	dev->clk = clk_get(&pdev->dev, "sclk_fimg2d");
  	if (IS_ERR(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(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 unprep_clk_gate;
  	}
  
  	vb2_dma_contig_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
  
  	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
  	if (ret)
  		goto unprep_clk_gate;
  	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;
  	vfd->v4l2_dev = &dev->v4l2_dev;
  	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;
  
  	of_id = of_match_node(exynos_g2d_match, pdev->dev.of_node);
  	if (!of_id) {
  		ret = -ENODEV;
  		goto unreg_video_dev;
  	}
  	dev->variant = (struct g2d_variant *)of_id->data;
  
  	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);
  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 = 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_clear_max_seg_size(&pdev->dev);
  	clk_unprepare(dev->gate);
  	clk_put(dev->gate);
  	clk_unprepare(dev->clk);
  	clk_put(dev->clk);
  	return 0;
  }
  
  static struct g2d_variant g2d_drvdata_v3x = {
  	.hw_rev = TYPE_G2D_3X, /* Revision 3.0 for S5PV210 and Exynos4210 */
  };
  
  static struct g2d_variant g2d_drvdata_v4x = {
  	.hw_rev = TYPE_G2D_4X, /* Revision 4.1 for Exynos4X12 and Exynos5 */
  };
  
  static const struct of_device_id exynos_g2d_match[] = {
  	{
  		.compatible = "samsung,s5pv210-g2d",
  		.data = &g2d_drvdata_v3x,
  	}, {
  		.compatible = "samsung,exynos4212-g2d",
  		.data = &g2d_drvdata_v4x,
  	},
  	{},
  };
  MODULE_DEVICE_TABLE(of, exynos_g2d_match);
  
  static struct platform_driver g2d_pdrv = {
  	.probe		= g2d_probe,
  	.remove		= g2d_remove,
  	.driver		= {
  		.name = G2D_NAME,
  		.of_match_table = exynos_g2d_match,
  	},
  };
  
  module_platform_driver(g2d_pdrv);
  
  MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
  MODULE_DESCRIPTION("S5P G2D 2d graphics accelerator driver");
  MODULE_LICENSE("GPL");
  