/*
 * Samsung S5P Multi Format Codec v 5.1
 *
 * 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/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-event.h>
#include <linux/workqueue.h>
#include <linux/of.h>
#include <linux/of_reserved_mem.h>
#include <media/videobuf2-v4l2.h>
#include "s5p_mfc_common.h"
#include "s5p_mfc_ctrl.h"
#include "s5p_mfc_debug.h"
#include "s5p_mfc_dec.h"
#include "s5p_mfc_enc.h"
#include "s5p_mfc_intr.h"
#include "s5p_mfc_iommu.h"
#include "s5p_mfc_opr.h"
#include "s5p_mfc_cmd.h"
#include "s5p_mfc_pm.h"

#define S5P_MFC_DEC_NAME	"s5p-mfc-dec"
#define S5P_MFC_ENC_NAME	"s5p-mfc-enc"

int mfc_debug_level;
module_param_named(debug, mfc_debug_level, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug level - higher value produces more verbose messages");

/* Helper functions for interrupt processing */

/* Remove from hw execution round robin */
void clear_work_bit(struct s5p_mfc_ctx *ctx)
{
	struct s5p_mfc_dev *dev = ctx->dev;

	spin_lock(&dev->condlock);
	__clear_bit(ctx->num, &dev->ctx_work_bits);
	spin_unlock(&dev->condlock);
}

/* Add to hw execution round robin */
void set_work_bit(struct s5p_mfc_ctx *ctx)
{
	struct s5p_mfc_dev *dev = ctx->dev;

	spin_lock(&dev->condlock);
	__set_bit(ctx->num, &dev->ctx_work_bits);
	spin_unlock(&dev->condlock);
}

/* Remove from hw execution round robin */
void clear_work_bit_irqsave(struct s5p_mfc_ctx *ctx)
{
	struct s5p_mfc_dev *dev = ctx->dev;
	unsigned long flags;

	spin_lock_irqsave(&dev->condlock, flags);
	__clear_bit(ctx->num, &dev->ctx_work_bits);
	spin_unlock_irqrestore(&dev->condlock, flags);
}

/* Add to hw execution round robin */
void set_work_bit_irqsave(struct s5p_mfc_ctx *ctx)
{
	struct s5p_mfc_dev *dev = ctx->dev;
	unsigned long flags;

	spin_lock_irqsave(&dev->condlock, flags);
	__set_bit(ctx->num, &dev->ctx_work_bits);
	spin_unlock_irqrestore(&dev->condlock, flags);
}

int s5p_mfc_get_new_ctx(struct s5p_mfc_dev *dev)
{
	unsigned long flags;
	int ctx;

	spin_lock_irqsave(&dev->condlock, flags);
	ctx = dev->curr_ctx;
	do {
		ctx = (ctx + 1) % MFC_NUM_CONTEXTS;
		if (ctx == dev->curr_ctx) {
			if (!test_bit(ctx, &dev->ctx_work_bits))
				ctx = -EAGAIN;
			break;
		}
	} while (!test_bit(ctx, &dev->ctx_work_bits));
	spin_unlock_irqrestore(&dev->condlock, flags);

	return ctx;
}

/* Wake up context wait_queue */
static void wake_up_ctx(struct s5p_mfc_ctx *ctx, unsigned int reason,
			unsigned int err)
{
	ctx->int_cond = 1;
	ctx->int_type = reason;
	ctx->int_err = err;
	wake_up(&ctx->queue);
}

/* Wake up device wait_queue */
static void wake_up_dev(struct s5p_mfc_dev *dev, unsigned int reason,
			unsigned int err)
{
	dev->int_cond = 1;
	dev->int_type = reason;
	dev->int_err = err;
	wake_up(&dev->queue);
}

void s5p_mfc_cleanup_queue(struct list_head *lh, struct vb2_queue *vq)
{
	struct s5p_mfc_buf *b;
	int i;

	while (!list_empty(lh)) {
		b = list_entry(lh->next, struct s5p_mfc_buf, list);
		for (i = 0; i < b->b->vb2_buf.num_planes; i++)
			vb2_set_plane_payload(&b->b->vb2_buf, i, 0);
		vb2_buffer_done(&b->b->vb2_buf, VB2_BUF_STATE_ERROR);
		list_del(&b->list);
	}
}

static void s5p_mfc_watchdog(unsigned long arg)
{
	struct s5p_mfc_dev *dev = (struct s5p_mfc_dev *)arg;

	if (test_bit(0, &dev->hw_lock))
		atomic_inc(&dev->watchdog_cnt);
	if (atomic_read(&dev->watchdog_cnt) >= MFC_WATCHDOG_CNT) {
		/* This means that hw is busy and no interrupts were
		 * generated by hw for the Nth time of running this
		 * watchdog timer. This usually means a serious hw
		 * error. Now it is time to kill all instances and
		 * reset the MFC. */
		mfc_err("Time out during waiting for HW\n");
		schedule_work(&dev->watchdog_work);
	}
	dev->watchdog_timer.expires = jiffies +
					msecs_to_jiffies(MFC_WATCHDOG_INTERVAL);
	add_timer(&dev->watchdog_timer);
}

static void s5p_mfc_watchdog_worker(struct work_struct *work)
{
	struct s5p_mfc_dev *dev;
	struct s5p_mfc_ctx *ctx;
	unsigned long flags;
	int mutex_locked;
	int i, ret;

	dev = container_of(work, struct s5p_mfc_dev, watchdog_work);

	mfc_err("Driver timeout error handling\n");
	/* Lock the mutex that protects open and release.
	 * This is necessary as they may load and unload firmware. */
	mutex_locked = mutex_trylock(&dev->mfc_mutex);
	if (!mutex_locked)
		mfc_err("Error: some instance may be closing/opening\n");
	spin_lock_irqsave(&dev->irqlock, flags);

	s5p_mfc_clock_off();

	for (i = 0; i < MFC_NUM_CONTEXTS; i++) {
		ctx = dev->ctx[i];
		if (!ctx)
			continue;
		ctx->state = MFCINST_ERROR;
		s5p_mfc_cleanup_queue(&ctx->dst_queue, &ctx->vq_dst);
		s5p_mfc_cleanup_queue(&ctx->src_queue, &ctx->vq_src);
		clear_work_bit(ctx);
		wake_up_ctx(ctx, S5P_MFC_R2H_CMD_ERR_RET, 0);
	}
	clear_bit(0, &dev->hw_lock);
	spin_unlock_irqrestore(&dev->irqlock, flags);

	/* De-init MFC */
	s5p_mfc_deinit_hw(dev);

	/* Double check if there is at least one instance running.
	 * If no instance is in memory than no firmware should be present */
	if (dev->num_inst > 0) {
		ret = s5p_mfc_load_firmware(dev);
		if (ret) {
			mfc_err("Failed to reload FW\n");
			goto unlock;
		}
		s5p_mfc_clock_on();
		ret = s5p_mfc_init_hw(dev);
		s5p_mfc_clock_off();
		if (ret)
			mfc_err("Failed to reinit FW\n");
	}
unlock:
	if (mutex_locked)
		mutex_unlock(&dev->mfc_mutex);
}

static void s5p_mfc_handle_frame_all_extracted(struct s5p_mfc_ctx *ctx)
{
	struct s5p_mfc_buf *dst_buf;
	struct s5p_mfc_dev *dev = ctx->dev;

	ctx->state = MFCINST_FINISHED;
	ctx->sequence++;
	while (!list_empty(&ctx->dst_queue)) {
		dst_buf = list_entry(ctx->dst_queue.next,
				     struct s5p_mfc_buf, list);
		mfc_debug(2, "Cleaning up buffer: %d\n",
					  dst_buf->b->vb2_buf.index);
		vb2_set_plane_payload(&dst_buf->b->vb2_buf, 0, 0);
		vb2_set_plane_payload(&dst_buf->b->vb2_buf, 1, 0);
		list_del(&dst_buf->list);
		dst_buf->flags |= MFC_BUF_FLAG_EOS;
		ctx->dst_queue_cnt--;
		dst_buf->b->sequence = (ctx->sequence++);

		if (s5p_mfc_hw_call(dev->mfc_ops, get_pic_type_top, ctx) ==
			s5p_mfc_hw_call(dev->mfc_ops, get_pic_type_bot, ctx))
			dst_buf->b->field = V4L2_FIELD_NONE;
		else
			dst_buf->b->field = V4L2_FIELD_INTERLACED;
		dst_buf->b->flags |= V4L2_BUF_FLAG_LAST;

		ctx->dec_dst_flag &= ~(1 << dst_buf->b->vb2_buf.index);
		vb2_buffer_done(&dst_buf->b->vb2_buf, VB2_BUF_STATE_DONE);
	}
}

static void s5p_mfc_handle_frame_copy_time(struct s5p_mfc_ctx *ctx)
{
	struct s5p_mfc_dev *dev = ctx->dev;
	struct s5p_mfc_buf  *dst_buf, *src_buf;
	size_t dec_y_addr;
	unsigned int frame_type;

	/* Make sure we actually have a new frame before continuing. */
	frame_type = s5p_mfc_hw_call(dev->mfc_ops, get_dec_frame_type, dev);
	if (frame_type == S5P_FIMV_DECODE_FRAME_SKIPPED)
		return;
	dec_y_addr = s5p_mfc_hw_call(dev->mfc_ops, get_dec_y_adr, dev);

	/* Copy timestamp / timecode from decoded src to dst and set
	   appropriate flags. */
	src_buf = list_entry(ctx->src_queue.next, struct s5p_mfc_buf, list);
	list_for_each_entry(dst_buf, &ctx->dst_queue, list) {
		if (vb2_dma_contig_plane_dma_addr(&dst_buf->b->vb2_buf, 0)
				== dec_y_addr) {
			dst_buf->b->timecode =
						src_buf->b->timecode;
			dst_buf->b->vb2_buf.timestamp =
						src_buf->b->vb2_buf.timestamp;
			dst_buf->b->flags &=
				~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
			dst_buf->b->flags |=
				src_buf->b->flags
				& V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
			switch (frame_type) {
			case S5P_FIMV_DECODE_FRAME_I_FRAME:
				dst_buf->b->flags |=
						V4L2_BUF_FLAG_KEYFRAME;
				break;
			case S5P_FIMV_DECODE_FRAME_P_FRAME:
				dst_buf->b->flags |=
						V4L2_BUF_FLAG_PFRAME;
				break;
			case S5P_FIMV_DECODE_FRAME_B_FRAME:
				dst_buf->b->flags |=
						V4L2_BUF_FLAG_BFRAME;
				break;
			default:
				/* Don't know how to handle
				   S5P_FIMV_DECODE_FRAME_OTHER_FRAME. */
				mfc_debug(2, "Unexpected frame type: %d\n",
						frame_type);
			}
			break;
		}
	}
}

static void s5p_mfc_handle_frame_new(struct s5p_mfc_ctx *ctx, unsigned int err)
{
	struct s5p_mfc_dev *dev = ctx->dev;
	struct s5p_mfc_buf  *dst_buf;
	size_t dspl_y_addr;
	unsigned int frame_type;

	dspl_y_addr = s5p_mfc_hw_call(dev->mfc_ops, get_dspl_y_adr, dev);
	if (IS_MFCV6_PLUS(dev))
		frame_type = s5p_mfc_hw_call(dev->mfc_ops,
			get_disp_frame_type, ctx);
	else
		frame_type = s5p_mfc_hw_call(dev->mfc_ops,
			get_dec_frame_type, dev);

	/* If frame is same as previous then skip and do not dequeue */
	if (frame_type == S5P_FIMV_DECODE_FRAME_SKIPPED) {
		if (!ctx->after_packed_pb)
			ctx->sequence++;
		ctx->after_packed_pb = 0;
		return;
	}
	ctx->sequence++;
	/* The MFC returns address of the buffer, now we have to
	 * check which videobuf does it correspond to */
	list_for_each_entry(dst_buf, &ctx->dst_queue, list) {
		/* Check if this is the buffer we're looking for */
		if (vb2_dma_contig_plane_dma_addr(&dst_buf->b->vb2_buf, 0)
				== dspl_y_addr) {
			list_del(&dst_buf->list);
			ctx->dst_queue_cnt--;
			dst_buf->b->sequence = ctx->sequence;
			if (s5p_mfc_hw_call(dev->mfc_ops,
					get_pic_type_top, ctx) ==
				s5p_mfc_hw_call(dev->mfc_ops,
					get_pic_type_bot, ctx))
				dst_buf->b->field = V4L2_FIELD_NONE;
			else
				dst_buf->b->field =
							V4L2_FIELD_INTERLACED;
			vb2_set_plane_payload(&dst_buf->b->vb2_buf, 0,
						ctx->luma_size);
			vb2_set_plane_payload(&dst_buf->b->vb2_buf, 1,
						ctx->chroma_size);
			clear_bit(dst_buf->b->vb2_buf.index,
							&ctx->dec_dst_flag);

			vb2_buffer_done(&dst_buf->b->vb2_buf, err ?
				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);

			break;
		}
	}
}

/* Handle frame decoding interrupt */
static void s5p_mfc_handle_frame(struct s5p_mfc_ctx *ctx,
					unsigned int reason, unsigned int err)
{
	struct s5p_mfc_dev *dev = ctx->dev;
	unsigned int dst_frame_status;
	unsigned int dec_frame_status;
	struct s5p_mfc_buf *src_buf;
	unsigned int res_change;

	dst_frame_status = s5p_mfc_hw_call(dev->mfc_ops, get_dspl_status, dev)
				& S5P_FIMV_DEC_STATUS_DECODING_STATUS_MASK;
	dec_frame_status = s5p_mfc_hw_call(dev->mfc_ops, get_dec_status, dev)
				& S5P_FIMV_DEC_STATUS_DECODING_STATUS_MASK;
	res_change = (s5p_mfc_hw_call(dev->mfc_ops, get_dspl_status, dev)
				& S5P_FIMV_DEC_STATUS_RESOLUTION_MASK)
				>> S5P_FIMV_DEC_STATUS_RESOLUTION_SHIFT;
	mfc_debug(2, "Frame Status: %x\n", dst_frame_status);
	if (ctx->state == MFCINST_RES_CHANGE_INIT)
		ctx->state = MFCINST_RES_CHANGE_FLUSH;
	if (res_change == S5P_FIMV_RES_INCREASE ||
		res_change == S5P_FIMV_RES_DECREASE) {
		ctx->state = MFCINST_RES_CHANGE_INIT;
		s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
		wake_up_ctx(ctx, reason, err);
		WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);
		s5p_mfc_clock_off();
		s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
		return;
	}
	if (ctx->dpb_flush_flag)
		ctx->dpb_flush_flag = 0;

	/* All frames remaining in the buffer have been extracted  */
	if (dst_frame_status == S5P_FIMV_DEC_STATUS_DECODING_EMPTY) {
		if (ctx->state == MFCINST_RES_CHANGE_FLUSH) {
			static const struct v4l2_event ev_src_ch = {
				.type = V4L2_EVENT_SOURCE_CHANGE,
				.u.src_change.changes =
					V4L2_EVENT_SRC_CH_RESOLUTION,
			};

			s5p_mfc_handle_frame_all_extracted(ctx);
			ctx->state = MFCINST_RES_CHANGE_END;
			v4l2_event_queue_fh(&ctx->fh, &ev_src_ch);

			goto leave_handle_frame;
		} else {
			s5p_mfc_handle_frame_all_extracted(ctx);
		}
	}

	if (dec_frame_status == S5P_FIMV_DEC_STATUS_DECODING_DISPLAY)
		s5p_mfc_handle_frame_copy_time(ctx);

	/* A frame has been decoded and is in the buffer  */
	if (dst_frame_status == S5P_FIMV_DEC_STATUS_DISPLAY_ONLY ||
	    dst_frame_status == S5P_FIMV_DEC_STATUS_DECODING_DISPLAY) {
		s5p_mfc_handle_frame_new(ctx, err);
	} else {
		mfc_debug(2, "No frame decode\n");
	}
	/* Mark source buffer as complete */
	if (dst_frame_status != S5P_FIMV_DEC_STATUS_DISPLAY_ONLY
		&& !list_empty(&ctx->src_queue)) {
		src_buf = list_entry(ctx->src_queue.next, struct s5p_mfc_buf,
								list);
		ctx->consumed_stream += s5p_mfc_hw_call(dev->mfc_ops,
						get_consumed_stream, dev);
		if (ctx->codec_mode != S5P_MFC_CODEC_H264_DEC &&
			ctx->codec_mode != S5P_MFC_CODEC_VP8_DEC &&
			ctx->consumed_stream + STUFF_BYTE <
			src_buf->b->vb2_buf.planes[0].bytesused) {
			/* Run MFC again on the same buffer */
			mfc_debug(2, "Running again the same buffer\n");
			ctx->after_packed_pb = 1;
		} else {
			mfc_debug(2, "MFC needs next buffer\n");
			ctx->consumed_stream = 0;
			if (src_buf->flags & MFC_BUF_FLAG_EOS)
				ctx->state = MFCINST_FINISHING;
			list_del(&src_buf->list);
			ctx->src_queue_cnt--;
			if (s5p_mfc_hw_call(dev->mfc_ops, err_dec, err) > 0)
				vb2_buffer_done(&src_buf->b->vb2_buf,
						VB2_BUF_STATE_ERROR);
			else
				vb2_buffer_done(&src_buf->b->vb2_buf,
						VB2_BUF_STATE_DONE);
		}
	}
leave_handle_frame:
	if ((ctx->src_queue_cnt == 0 && ctx->state != MFCINST_FINISHING)
				    || ctx->dst_queue_cnt < ctx->pb_count)
		clear_work_bit(ctx);
	s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
	wake_up_ctx(ctx, reason, err);
	WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);
	s5p_mfc_clock_off();
	/* if suspending, wake up device and do not try_run again*/
	if (test_bit(0, &dev->enter_suspend))
		wake_up_dev(dev, reason, err);
	else
		s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
}

/* Error handling for interrupt */
static void s5p_mfc_handle_error(struct s5p_mfc_dev *dev,
		struct s5p_mfc_ctx *ctx, unsigned int reason, unsigned int err)
{
	mfc_err("Interrupt Error: %08x\n", err);

	if (ctx != NULL) {
		/* Error recovery is dependent on the state of context */
		switch (ctx->state) {
		case MFCINST_RES_CHANGE_INIT:
		case MFCINST_RES_CHANGE_FLUSH:
		case MFCINST_RES_CHANGE_END:
		case MFCINST_FINISHING:
		case MFCINST_FINISHED:
		case MFCINST_RUNNING:
			/* It is highly probable that an error occurred
			 * while decoding a frame */
			clear_work_bit(ctx);
			ctx->state = MFCINST_ERROR;
			/* Mark all dst buffers as having an error */
			s5p_mfc_cleanup_queue(&ctx->dst_queue, &ctx->vq_dst);
			/* Mark all src buffers as having an error */
			s5p_mfc_cleanup_queue(&ctx->src_queue, &ctx->vq_src);
			wake_up_ctx(ctx, reason, err);
			break;
		default:
			clear_work_bit(ctx);
			ctx->state = MFCINST_ERROR;
			wake_up_ctx(ctx, reason, err);
			break;
		}
	}
	WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);
	s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
	s5p_mfc_clock_off();
	wake_up_dev(dev, reason, err);
}

/* Header parsing interrupt handling */
static void s5p_mfc_handle_seq_done(struct s5p_mfc_ctx *ctx,
				 unsigned int reason, unsigned int err)
{
	struct s5p_mfc_dev *dev;

	if (ctx == NULL)
		return;
	dev = ctx->dev;
	if (ctx->c_ops->post_seq_start) {
		if (ctx->c_ops->post_seq_start(ctx))
			mfc_err("post_seq_start() failed\n");
	} else {
		ctx->img_width = s5p_mfc_hw_call(dev->mfc_ops, get_img_width,
				dev);
		ctx->img_height = s5p_mfc_hw_call(dev->mfc_ops, get_img_height,
				dev);

		s5p_mfc_hw_call(dev->mfc_ops, dec_calc_dpb_size, ctx);

		ctx->pb_count = s5p_mfc_hw_call(dev->mfc_ops, get_dpb_count,
				dev);
		ctx->mv_count = s5p_mfc_hw_call(dev->mfc_ops, get_mv_count,
				dev);
		if (ctx->img_width == 0 || ctx->img_height == 0)
			ctx->state = MFCINST_ERROR;
		else
			ctx->state = MFCINST_HEAD_PARSED;

		if ((ctx->codec_mode == S5P_MFC_CODEC_H264_DEC ||
			ctx->codec_mode == S5P_MFC_CODEC_H264_MVC_DEC) &&
				!list_empty(&ctx->src_queue)) {
			struct s5p_mfc_buf *src_buf;
			src_buf = list_entry(ctx->src_queue.next,
					struct s5p_mfc_buf, list);
			if (s5p_mfc_hw_call(dev->mfc_ops, get_consumed_stream,
						dev) <
					src_buf->b->vb2_buf.planes[0].bytesused)
				ctx->head_processed = 0;
			else
				ctx->head_processed = 1;
		} else {
			ctx->head_processed = 1;
		}
	}
	s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
	clear_work_bit(ctx);
	WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);
	s5p_mfc_clock_off();
	s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
	wake_up_ctx(ctx, reason, err);
}

/* Header parsing interrupt handling */
static void s5p_mfc_handle_init_buffers(struct s5p_mfc_ctx *ctx,
				 unsigned int reason, unsigned int err)
{
	struct s5p_mfc_buf *src_buf;
	struct s5p_mfc_dev *dev;

	if (ctx == NULL)
		return;
	dev = ctx->dev;
	s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
	ctx->int_type = reason;
	ctx->int_err = err;
	ctx->int_cond = 1;
	clear_work_bit(ctx);
	if (err == 0) {
		ctx->state = MFCINST_RUNNING;
		if (!ctx->dpb_flush_flag && ctx->head_processed) {
			if (!list_empty(&ctx->src_queue)) {
				src_buf = list_entry(ctx->src_queue.next,
					     struct s5p_mfc_buf, list);
				list_del(&src_buf->list);
				ctx->src_queue_cnt--;
				vb2_buffer_done(&src_buf->b->vb2_buf,
						VB2_BUF_STATE_DONE);
			}
		} else {
			ctx->dpb_flush_flag = 0;
		}
		WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);

		s5p_mfc_clock_off();

		wake_up(&ctx->queue);
		s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
	} else {
		WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);

		s5p_mfc_clock_off();

		wake_up(&ctx->queue);
	}
}

static void s5p_mfc_handle_stream_complete(struct s5p_mfc_ctx *ctx)
{
	struct s5p_mfc_dev *dev = ctx->dev;
	struct s5p_mfc_buf *mb_entry;

	mfc_debug(2, "Stream completed\n");

	ctx->state = MFCINST_FINISHED;

	if (!list_empty(&ctx->dst_queue)) {
		mb_entry = list_entry(ctx->dst_queue.next, struct s5p_mfc_buf,
									list);
		list_del(&mb_entry->list);
		ctx->dst_queue_cnt--;
		vb2_set_plane_payload(&mb_entry->b->vb2_buf, 0, 0);
		vb2_buffer_done(&mb_entry->b->vb2_buf, VB2_BUF_STATE_DONE);
	}

	clear_work_bit(ctx);

	WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);

	s5p_mfc_clock_off();
	wake_up(&ctx->queue);
	s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
}

/* Interrupt processing */
static irqreturn_t s5p_mfc_irq(int irq, void *priv)
{
	struct s5p_mfc_dev *dev = priv;
	struct s5p_mfc_ctx *ctx;
	unsigned int reason;
	unsigned int err;

	mfc_debug_enter();
	/* Reset the timeout watchdog */
	atomic_set(&dev->watchdog_cnt, 0);
	spin_lock(&dev->irqlock);
	ctx = dev->ctx[dev->curr_ctx];
	/* Get the reason of interrupt and the error code */
	reason = s5p_mfc_hw_call(dev->mfc_ops, get_int_reason, dev);
	err = s5p_mfc_hw_call(dev->mfc_ops, get_int_err, dev);
	mfc_debug(1, "Int reason: %d (err: %08x)\n", reason, err);
	switch (reason) {
	case S5P_MFC_R2H_CMD_ERR_RET:
		/* An error has occurred */
		if (ctx->state == MFCINST_RUNNING &&
			s5p_mfc_hw_call(dev->mfc_ops, err_dec, err) >=
				dev->warn_start)
			s5p_mfc_handle_frame(ctx, reason, err);
		else
			s5p_mfc_handle_error(dev, ctx, reason, err);
		clear_bit(0, &dev->enter_suspend);
		break;

	case S5P_MFC_R2H_CMD_SLICE_DONE_RET:
	case S5P_MFC_R2H_CMD_FIELD_DONE_RET:
	case S5P_MFC_R2H_CMD_FRAME_DONE_RET:
		if (ctx->c_ops->post_frame_start) {
			if (ctx->c_ops->post_frame_start(ctx))
				mfc_err("post_frame_start() failed\n");

			if (ctx->state == MFCINST_FINISHING &&
						list_empty(&ctx->ref_queue)) {
				s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
				s5p_mfc_handle_stream_complete(ctx);
				break;
			}
			s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
			WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);
			s5p_mfc_clock_off();
			wake_up_ctx(ctx, reason, err);
			s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
		} else {
			s5p_mfc_handle_frame(ctx, reason, err);
		}
		break;

	case S5P_MFC_R2H_CMD_SEQ_DONE_RET:
		s5p_mfc_handle_seq_done(ctx, reason, err);
		break;

	case S5P_MFC_R2H_CMD_OPEN_INSTANCE_RET:
		ctx->inst_no = s5p_mfc_hw_call(dev->mfc_ops, get_inst_no, dev);
		ctx->state = MFCINST_GOT_INST;
		goto irq_cleanup_hw;

	case S5P_MFC_R2H_CMD_CLOSE_INSTANCE_RET:
		ctx->inst_no = MFC_NO_INSTANCE_SET;
		ctx->state = MFCINST_FREE;
		goto irq_cleanup_hw;

	case S5P_MFC_R2H_CMD_SYS_INIT_RET:
	case S5P_MFC_R2H_CMD_FW_STATUS_RET:
	case S5P_MFC_R2H_CMD_SLEEP_RET:
	case S5P_MFC_R2H_CMD_WAKEUP_RET:
		if (ctx)
			clear_work_bit(ctx);
		s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
		clear_bit(0, &dev->hw_lock);
		clear_bit(0, &dev->enter_suspend);
		wake_up_dev(dev, reason, err);
		break;

	case S5P_MFC_R2H_CMD_INIT_BUFFERS_RET:
		s5p_mfc_handle_init_buffers(ctx, reason, err);
		break;

	case S5P_MFC_R2H_CMD_COMPLETE_SEQ_RET:
		s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
		ctx->int_type = reason;
		ctx->int_err = err;
		s5p_mfc_handle_stream_complete(ctx);
		break;

	case S5P_MFC_R2H_CMD_DPB_FLUSH_RET:
		ctx->state = MFCINST_RUNNING;
		goto irq_cleanup_hw;

	default:
		mfc_debug(2, "Unknown int reason\n");
		s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
	}
	spin_unlock(&dev->irqlock);
	mfc_debug_leave();
	return IRQ_HANDLED;
irq_cleanup_hw:
	s5p_mfc_hw_call(dev->mfc_ops, clear_int_flags, dev);
	ctx->int_type = reason;
	ctx->int_err = err;
	ctx->int_cond = 1;
	if (test_and_clear_bit(0, &dev->hw_lock) == 0)
		mfc_err("Failed to unlock hw\n");

	s5p_mfc_clock_off();
	clear_work_bit(ctx);
	wake_up(&ctx->queue);

	s5p_mfc_hw_call(dev->mfc_ops, try_run, dev);
	spin_unlock(&dev->irqlock);
	mfc_debug(2, "Exit via irq_cleanup_hw\n");
	return IRQ_HANDLED;
}

/* Open an MFC node */
static int s5p_mfc_open(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct s5p_mfc_dev *dev = video_drvdata(file);
	struct s5p_mfc_ctx *ctx = NULL;
	struct vb2_queue *q;
	int ret = 0;

	mfc_debug_enter();
	if (mutex_lock_interruptible(&dev->mfc_mutex))
		return -ERESTARTSYS;
	dev->num_inst++;	/* It is guarded by mfc_mutex in vfd */
	/* Allocate memory for context */
	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (!ctx) {
		ret = -ENOMEM;
		goto err_alloc;
	}
	v4l2_fh_init(&ctx->fh, vdev);
	file->private_data = &ctx->fh;
	v4l2_fh_add(&ctx->fh);
	ctx->dev = dev;
	INIT_LIST_HEAD(&ctx->src_queue);
	INIT_LIST_HEAD(&ctx->dst_queue);
	ctx->src_queue_cnt = 0;
	ctx->dst_queue_cnt = 0;
	/* Get context number */
	ctx->num = 0;
	while (dev->ctx[ctx->num]) {
		ctx->num++;
		if (ctx->num >= MFC_NUM_CONTEXTS) {
			mfc_debug(2, "Too many open contexts\n");
			ret = -EBUSY;
			goto err_no_ctx;
		}
	}
	/* Mark context as idle */
	clear_work_bit_irqsave(ctx);
	dev->ctx[ctx->num] = ctx;
	if (vdev == dev->vfd_dec) {
		ctx->type = MFCINST_DECODER;
		ctx->c_ops = get_dec_codec_ops();
		s5p_mfc_dec_init(ctx);
		/* Setup ctrl handler */
		ret = s5p_mfc_dec_ctrls_setup(ctx);
		if (ret) {
			mfc_err("Failed to setup mfc controls\n");
			goto err_ctrls_setup;
		}
	} else if (vdev == dev->vfd_enc) {
		ctx->type = MFCINST_ENCODER;
		ctx->c_ops = get_enc_codec_ops();
		/* only for encoder */
		INIT_LIST_HEAD(&ctx->ref_queue);
		ctx->ref_queue_cnt = 0;
		s5p_mfc_enc_init(ctx);
		/* Setup ctrl handler */
		ret = s5p_mfc_enc_ctrls_setup(ctx);
		if (ret) {
			mfc_err("Failed to setup mfc controls\n");
			goto err_ctrls_setup;
		}
	} else {
		ret = -ENOENT;
		goto err_bad_node;
	}
	ctx->fh.ctrl_handler = &ctx->ctrl_handler;
	ctx->inst_no = MFC_NO_INSTANCE_SET;
	/* Load firmware if this is the first instance */
	if (dev->num_inst == 1) {
		dev->watchdog_timer.expires = jiffies +
					msecs_to_jiffies(MFC_WATCHDOG_INTERVAL);
		add_timer(&dev->watchdog_timer);
		ret = s5p_mfc_power_on();
		if (ret < 0) {
			mfc_err("power on failed\n");
			goto err_pwr_enable;
		}
		s5p_mfc_clock_on();
		ret = s5p_mfc_load_firmware(dev);
		if (ret) {
			s5p_mfc_clock_off();
			goto err_load_fw;
		}
		/* Init the FW */
		ret = s5p_mfc_init_hw(dev);
		s5p_mfc_clock_off();
		if (ret)
			goto err_init_hw;
	}
	/* Init videobuf2 queue for CAPTURE */
	q = &ctx->vq_dst;
	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
	q->drv_priv = &ctx->fh;
	q->lock = &dev->mfc_mutex;
	if (vdev == dev->vfd_dec) {
		q->io_modes = VB2_MMAP;
		q->ops = get_dec_queue_ops();
	} else if (vdev == dev->vfd_enc) {
		q->io_modes = VB2_MMAP | VB2_USERPTR;
		q->ops = get_enc_queue_ops();
	} else {
		ret = -ENOENT;
		goto err_queue_init;
	}
	q->mem_ops = &vb2_dma_contig_memops;
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
	ret = vb2_queue_init(q);
	if (ret) {
		mfc_err("Failed to initialize videobuf2 queue(capture)\n");
		goto err_queue_init;
	}
	/* Init videobuf2 queue for OUTPUT */
	q = &ctx->vq_src;
	q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
	q->io_modes = VB2_MMAP;
	q->drv_priv = &ctx->fh;
	q->lock = &dev->mfc_mutex;
	if (vdev == dev->vfd_dec) {
		q->io_modes = VB2_MMAP;
		q->ops = get_dec_queue_ops();
	} else if (vdev == dev->vfd_enc) {
		q->io_modes = VB2_MMAP | VB2_USERPTR;
		q->ops = get_enc_queue_ops();
	} else {
		ret = -ENOENT;
		goto err_queue_init;
	}
	/* One way to indicate end-of-stream for MFC is to set the
	 * bytesused == 0. However by default videobuf2 handles bytesused
	 * equal to 0 as a special case and changes its value to the size
	 * of the buffer. Set the allow_zero_bytesused flag so that videobuf2
	 * will keep the value of bytesused intact.
	 */
	q->allow_zero_bytesused = 1;
	q->mem_ops = &vb2_dma_contig_memops;
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
	ret = vb2_queue_init(q);
	if (ret) {
		mfc_err("Failed to initialize videobuf2 queue(output)\n");
		goto err_queue_init;
	}
	init_waitqueue_head(&ctx->queue);
	mutex_unlock(&dev->mfc_mutex);
	mfc_debug_leave();
	return ret;
	/* Deinit when failure occurred */
err_queue_init:
	if (dev->num_inst == 1)
		s5p_mfc_deinit_hw(dev);
err_init_hw:
err_load_fw:
err_pwr_enable:
	if (dev->num_inst == 1) {
		if (s5p_mfc_power_off() < 0)
			mfc_err("power off failed\n");
		del_timer_sync(&dev->watchdog_timer);
	}
err_ctrls_setup:
	s5p_mfc_dec_ctrls_delete(ctx);
err_bad_node:
	dev->ctx[ctx->num] = NULL;
err_no_ctx:
	v4l2_fh_del(&ctx->fh);
	v4l2_fh_exit(&ctx->fh);
	kfree(ctx);
err_alloc:
	dev->num_inst--;
	mutex_unlock(&dev->mfc_mutex);
	mfc_debug_leave();
	return ret;
}

/* Release MFC context */
static int s5p_mfc_release(struct file *file)
{
	struct s5p_mfc_ctx *ctx = fh_to_ctx(file->private_data);
	struct s5p_mfc_dev *dev = ctx->dev;

	/* if dev is null, do cleanup that doesn't need dev */
	mfc_debug_enter();
	if (dev)
		mutex_lock(&dev->mfc_mutex);
	vb2_queue_release(&ctx->vq_src);
	vb2_queue_release(&ctx->vq_dst);
	if (dev) {
		s5p_mfc_clock_on();

		/* Mark context as idle */
		clear_work_bit_irqsave(ctx);
		/*
		 * If instance was initialised and not yet freed,
		 * return instance and free resources
		*/
		if (ctx->state != MFCINST_FREE && ctx->state != MFCINST_INIT) {
			mfc_debug(2, "Has to free instance\n");
			s5p_mfc_close_mfc_inst(dev, ctx);
		}
		/* hardware locking scheme */
		if (dev->curr_ctx == ctx->num)
			clear_bit(0, &dev->hw_lock);
		dev->num_inst--;
		if (dev->num_inst == 0) {
			mfc_debug(2, "Last instance\n");
			s5p_mfc_deinit_hw(dev);
			del_timer_sync(&dev->watchdog_timer);
			if (s5p_mfc_power_off() < 0)
				mfc_err("Power off failed\n");
		}
		mfc_debug(2, "Shutting down clock\n");
		s5p_mfc_clock_off();
	}
	if (dev)
		dev->ctx[ctx->num] = NULL;
	s5p_mfc_dec_ctrls_delete(ctx);
	v4l2_fh_del(&ctx->fh);
	/* vdev is gone if dev is null */
	if (dev)
		v4l2_fh_exit(&ctx->fh);
	kfree(ctx);
	mfc_debug_leave();
	if (dev)
		mutex_unlock(&dev->mfc_mutex);

	return 0;
}

/* Poll */
static unsigned int s5p_mfc_poll(struct file *file,
				 struct poll_table_struct *wait)
{
	struct s5p_mfc_ctx *ctx = fh_to_ctx(file->private_data);
	struct s5p_mfc_dev *dev = ctx->dev;
	struct vb2_queue *src_q, *dst_q;
	struct vb2_buffer *src_vb = NULL, *dst_vb = NULL;
	unsigned int rc = 0;
	unsigned long flags;

	mutex_lock(&dev->mfc_mutex);
	src_q = &ctx->vq_src;
	dst_q = &ctx->vq_dst;
	/*
	 * There has to be at least one buffer queued on each queued_list, which
	 * means either in driver already or waiting for driver to claim it
	 * and start processing.
	 */
	if ((!src_q->streaming || list_empty(&src_q->queued_list))
		&& (!dst_q->streaming || list_empty(&dst_q->queued_list))) {
		rc = POLLERR;
		goto end;
	}
	mutex_unlock(&dev->mfc_mutex);
	poll_wait(file, &ctx->fh.wait, wait);
	poll_wait(file, &src_q->done_wq, wait);
	poll_wait(file, &dst_q->done_wq, wait);
	mutex_lock(&dev->mfc_mutex);
	if (v4l2_event_pending(&ctx->fh))
		rc |= POLLPRI;
	spin_lock_irqsave(&src_q->done_lock, flags);
	if (!list_empty(&src_q->done_list))
		src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer,
								done_entry);
	if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE
				|| src_vb->state == VB2_BUF_STATE_ERROR))
		rc |= POLLOUT | POLLWRNORM;
	spin_unlock_irqrestore(&src_q->done_lock, flags);
	spin_lock_irqsave(&dst_q->done_lock, flags);
	if (!list_empty(&dst_q->done_list))
		dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer,
								done_entry);
	if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE
				|| dst_vb->state == VB2_BUF_STATE_ERROR))
		rc |= POLLIN | POLLRDNORM;
	spin_unlock_irqrestore(&dst_q->done_lock, flags);
end:
	mutex_unlock(&dev->mfc_mutex);
	return rc;
}

/* Mmap */
static int s5p_mfc_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct s5p_mfc_ctx *ctx = fh_to_ctx(file->private_data);
	struct s5p_mfc_dev *dev = ctx->dev;
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
	int ret;

	if (mutex_lock_interruptible(&dev->mfc_mutex))
		return -ERESTARTSYS;
	if (offset < DST_QUEUE_OFF_BASE) {
		mfc_debug(2, "mmaping source\n");
		ret = vb2_mmap(&ctx->vq_src, vma);
	} else {		/* capture */
		mfc_debug(2, "mmaping destination\n");
		vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
		ret = vb2_mmap(&ctx->vq_dst, vma);
	}
	mutex_unlock(&dev->mfc_mutex);
	return ret;
}

/* v4l2 ops */
static const struct v4l2_file_operations s5p_mfc_fops = {
	.owner = THIS_MODULE,
	.open = s5p_mfc_open,
	.release = s5p_mfc_release,
	.poll = s5p_mfc_poll,
	.unlocked_ioctl = video_ioctl2,
	.mmap = s5p_mfc_mmap,
};

/* DMA memory related helper functions */
static void s5p_mfc_memdev_release(struct device *dev)
{
	of_reserved_mem_device_release(dev);
}

static struct device *s5p_mfc_alloc_memdev(struct device *dev,
					   const char *name, unsigned int idx)
{
	struct device *child;
	int ret;

	child = devm_kzalloc(dev, sizeof(struct device), GFP_KERNEL);
	if (!child)
		return NULL;

	device_initialize(child);
	dev_set_name(child, "%s:%s", dev_name(dev), name);
	child->parent = dev;
	child->bus = dev->bus;
	child->coherent_dma_mask = dev->coherent_dma_mask;
	child->dma_mask = dev->dma_mask;
	child->release = s5p_mfc_memdev_release;

	if (device_add(child) == 0) {
		ret = of_reserved_mem_device_init_by_idx(child, dev->of_node,
							 idx);
		if (ret == 0)
			return child;
		device_del(child);
	}

	put_device(child);
	return NULL;
}

static int s5p_mfc_configure_dma_memory(struct s5p_mfc_dev *mfc_dev)
{
	struct device *dev = &mfc_dev->plat_dev->dev;

	/*
	 * When IOMMU is available, we cannot use the default configuration,
	 * because of MFC firmware requirements: address space limited to
	 * 256M and non-zero default start address.
	 * This is still simplified, not optimal configuration, but for now
	 * IOMMU core doesn't allow to configure device's IOMMUs channel
	 * separately.
	 */
	if (exynos_is_iommu_available(dev)) {
		int ret = exynos_configure_iommu(dev, S5P_MFC_IOMMU_DMA_BASE,
						 S5P_MFC_IOMMU_DMA_SIZE);
		if (ret == 0)
			mfc_dev->mem_dev_l = mfc_dev->mem_dev_r = dev;
		return ret;
	}

	/*
	 * Create and initialize virtual devices for accessing
	 * reserved memory regions.
	 */
	mfc_dev->mem_dev_l = s5p_mfc_alloc_memdev(dev, "left",
						  MFC_BANK1_ALLOC_CTX);
	if (!mfc_dev->mem_dev_l)
		return -ENODEV;
	mfc_dev->mem_dev_r = s5p_mfc_alloc_memdev(dev, "right",
						  MFC_BANK2_ALLOC_CTX);
	if (!mfc_dev->mem_dev_r) {
		device_unregister(mfc_dev->mem_dev_l);
		return -ENODEV;
	}

	return 0;
}

static void s5p_mfc_unconfigure_dma_memory(struct s5p_mfc_dev *mfc_dev)
{
	struct device *dev = &mfc_dev->plat_dev->dev;

	if (exynos_is_iommu_available(dev)) {
		exynos_unconfigure_iommu(dev);
		return;
	}

	device_unregister(mfc_dev->mem_dev_l);
	device_unregister(mfc_dev->mem_dev_r);
}

static void *mfc_get_drv_data(struct platform_device *pdev);

/* MFC probe function */
static int s5p_mfc_probe(struct platform_device *pdev)
{
	struct s5p_mfc_dev *dev;
	struct video_device *vfd;
	struct resource *res;
	int ret;

	pr_debug("%s++\n", __func__);
	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev) {
		dev_err(&pdev->dev, "Not enough memory for MFC device\n");
		return -ENOMEM;
	}

	spin_lock_init(&dev->irqlock);
	spin_lock_init(&dev->condlock);
	dev->plat_dev = pdev;
	if (!dev->plat_dev) {
		dev_err(&pdev->dev, "No platform data specified\n");
		return -ENODEV;
	}

	dev->variant = mfc_get_drv_data(pdev);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	dev->regs_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(dev->regs_base))
		return PTR_ERR(dev->regs_base);

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to get irq resource\n");
		return -ENOENT;
	}
	dev->irq = res->start;
	ret = devm_request_irq(&pdev->dev, dev->irq, s5p_mfc_irq,
					0, pdev->name, dev);
	if (ret) {
		dev_err(&pdev->dev, "Failed to install irq (%d)\n", ret);
		return ret;
	}

	ret = s5p_mfc_configure_dma_memory(dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to configure DMA memory\n");
		return ret;
	}

	ret = s5p_mfc_init_pm(dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to get mfc clock source\n");
		goto err_dma;
	}

	vb2_dma_contig_set_max_seg_size(dev->mem_dev_l, DMA_BIT_MASK(32));
	vb2_dma_contig_set_max_seg_size(dev->mem_dev_r, DMA_BIT_MASK(32));

	mutex_init(&dev->mfc_mutex);

	ret = s5p_mfc_alloc_firmware(dev);
	if (ret)
		goto err_res;

	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
	if (ret)
		goto err_v4l2_dev_reg;
	init_waitqueue_head(&dev->queue);

	/* decoder */
	vfd = video_device_alloc();
	if (!vfd) {
		v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
		ret = -ENOMEM;
		goto err_dec_alloc;
	}
	vfd->fops	= &s5p_mfc_fops;
	vfd->ioctl_ops	= get_dec_v4l2_ioctl_ops();
	vfd->release	= video_device_release;
	vfd->lock	= &dev->mfc_mutex;
	vfd->v4l2_dev	= &dev->v4l2_dev;
	vfd->vfl_dir	= VFL_DIR_M2M;
	snprintf(vfd->name, sizeof(vfd->name), "%s", S5P_MFC_DEC_NAME);
	dev->vfd_dec	= vfd;
	video_set_drvdata(vfd, dev);

	/* encoder */
	vfd = video_device_alloc();
	if (!vfd) {
		v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
		ret = -ENOMEM;
		goto err_enc_alloc;
	}
	vfd->fops	= &s5p_mfc_fops;
	vfd->ioctl_ops	= get_enc_v4l2_ioctl_ops();
	vfd->release	= video_device_release;
	vfd->lock	= &dev->mfc_mutex;
	vfd->v4l2_dev	= &dev->v4l2_dev;
	vfd->vfl_dir	= VFL_DIR_M2M;
	snprintf(vfd->name, sizeof(vfd->name), "%s", S5P_MFC_ENC_NAME);
	dev->vfd_enc	= vfd;
	video_set_drvdata(vfd, dev);
	platform_set_drvdata(pdev, dev);

	dev->hw_lock = 0;
	INIT_WORK(&dev->watchdog_work, s5p_mfc_watchdog_worker);
	atomic_set(&dev->watchdog_cnt, 0);
	init_timer(&dev->watchdog_timer);
	dev->watchdog_timer.data = (unsigned long)dev;
	dev->watchdog_timer.function = s5p_mfc_watchdog;

	/* Initialize HW ops and commands based on MFC version */
	s5p_mfc_init_hw_ops(dev);
	s5p_mfc_init_hw_cmds(dev);
	s5p_mfc_init_regs(dev);

	/* Register decoder and encoder */
	ret = video_register_device(dev->vfd_dec, VFL_TYPE_GRABBER, 0);
	if (ret) {
		v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
		goto err_dec_reg;
	}
	v4l2_info(&dev->v4l2_dev,
		  "decoder registered as /dev/video%d\n", dev->vfd_dec->num);

	ret = video_register_device(dev->vfd_enc, VFL_TYPE_GRABBER, 0);
	if (ret) {
		v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
		goto err_enc_reg;
	}
	v4l2_info(&dev->v4l2_dev,
		  "encoder registered as /dev/video%d\n", dev->vfd_enc->num);

	pr_debug("%s--\n", __func__);
	return 0;

/* Deinit MFC if probe had failed */
err_enc_reg:
	video_unregister_device(dev->vfd_dec);
err_dec_reg:
	video_device_release(dev->vfd_enc);
err_enc_alloc:
	video_device_release(dev->vfd_dec);
err_dec_alloc:
	v4l2_device_unregister(&dev->v4l2_dev);
err_v4l2_dev_reg:
	s5p_mfc_release_firmware(dev);
err_res:
	s5p_mfc_final_pm(dev);
err_dma:
	s5p_mfc_unconfigure_dma_memory(dev);

	pr_debug("%s-- with error\n", __func__);
	return ret;

}

/* Remove the driver */
static int s5p_mfc_remove(struct platform_device *pdev)
{
	struct s5p_mfc_dev *dev = platform_get_drvdata(pdev);
	struct s5p_mfc_ctx *ctx;
	int i;

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

	/*
	 * Clear ctx dev pointer to avoid races between s5p_mfc_remove()
	 * and s5p_mfc_release() and s5p_mfc_release() accessing ctx->dev
	 * after s5p_mfc_remove() is run during unbind.
	*/
	mutex_lock(&dev->mfc_mutex);
	for (i = 0; i < MFC_NUM_CONTEXTS; i++) {
		ctx = dev->ctx[i];
		if (!ctx)
			continue;
		/* clear ctx->dev */
		ctx->dev = NULL;
	}
	mutex_unlock(&dev->mfc_mutex);

	del_timer_sync(&dev->watchdog_timer);
	flush_work(&dev->watchdog_work);

	video_unregister_device(dev->vfd_enc);
	video_unregister_device(dev->vfd_dec);
	video_device_release(dev->vfd_enc);
	video_device_release(dev->vfd_dec);
	v4l2_device_unregister(&dev->v4l2_dev);
	s5p_mfc_release_firmware(dev);
	s5p_mfc_unconfigure_dma_memory(dev);
	vb2_dma_contig_clear_max_seg_size(dev->mem_dev_l);
	vb2_dma_contig_clear_max_seg_size(dev->mem_dev_r);

	s5p_mfc_final_pm(dev);
	return 0;
}

#ifdef CONFIG_PM_SLEEP

static int s5p_mfc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct s5p_mfc_dev *m_dev = platform_get_drvdata(pdev);
	int ret;

	if (m_dev->num_inst == 0)
		return 0;

	if (test_and_set_bit(0, &m_dev->enter_suspend) != 0) {
		mfc_err("Error: going to suspend for a second time\n");
		return -EIO;
	}

	/* Check if we're processing then wait if it necessary. */
	while (test_and_set_bit(0, &m_dev->hw_lock) != 0) {
		/* Try and lock the HW */
		/* Wait on the interrupt waitqueue */
		ret = wait_event_interruptible_timeout(m_dev->queue,
			m_dev->int_cond, msecs_to_jiffies(MFC_INT_TIMEOUT));
		if (ret == 0) {
			mfc_err("Waiting for hardware to finish timed out\n");
			clear_bit(0, &m_dev->enter_suspend);
			return -EIO;
		}
	}

	ret = s5p_mfc_sleep(m_dev);
	if (ret) {
		clear_bit(0, &m_dev->enter_suspend);
		clear_bit(0, &m_dev->hw_lock);
	}
	return ret;
}

static int s5p_mfc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct s5p_mfc_dev *m_dev = platform_get_drvdata(pdev);

	if (m_dev->num_inst == 0)
		return 0;
	return s5p_mfc_wakeup(m_dev);
}
#endif

#ifdef CONFIG_PM
static int s5p_mfc_runtime_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct s5p_mfc_dev *m_dev = platform_get_drvdata(pdev);

	atomic_set(&m_dev->pm.power, 0);
	return 0;
}

static int s5p_mfc_runtime_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct s5p_mfc_dev *m_dev = platform_get_drvdata(pdev);

	atomic_set(&m_dev->pm.power, 1);
	return 0;
}
#endif

/* Power management */
static const struct dev_pm_ops s5p_mfc_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(s5p_mfc_suspend, s5p_mfc_resume)
	SET_RUNTIME_PM_OPS(s5p_mfc_runtime_suspend, s5p_mfc_runtime_resume,
			   NULL)
};

static struct s5p_mfc_buf_size_v5 mfc_buf_size_v5 = {
	.h264_ctx	= MFC_H264_CTX_BUF_SIZE,
	.non_h264_ctx	= MFC_CTX_BUF_SIZE,
	.dsc		= DESC_BUF_SIZE,
	.shm		= SHARED_BUF_SIZE,
};

static struct s5p_mfc_buf_size buf_size_v5 = {
	.fw	= MAX_FW_SIZE,
	.cpb	= MAX_CPB_SIZE,
	.priv	= &mfc_buf_size_v5,
};

static struct s5p_mfc_buf_align mfc_buf_align_v5 = {
	.base = MFC_BASE_ALIGN_ORDER,
};

static struct s5p_mfc_variant mfc_drvdata_v5 = {
	.version	= MFC_VERSION,
	.version_bit	= MFC_V5_BIT,
	.port_num	= MFC_NUM_PORTS,
	.buf_size	= &buf_size_v5,
	.buf_align	= &mfc_buf_align_v5,
	.fw_name[0]	= "s5p-mfc.fw",
};

static struct s5p_mfc_buf_size_v6 mfc_buf_size_v6 = {
	.dev_ctx	= MFC_CTX_BUF_SIZE_V6,
	.h264_dec_ctx	= MFC_H264_DEC_CTX_BUF_SIZE_V6,
	.other_dec_ctx	= MFC_OTHER_DEC_CTX_BUF_SIZE_V6,
	.h264_enc_ctx	= MFC_H264_ENC_CTX_BUF_SIZE_V6,
	.other_enc_ctx	= MFC_OTHER_ENC_CTX_BUF_SIZE_V6,
};

static struct s5p_mfc_buf_size buf_size_v6 = {
	.fw	= MAX_FW_SIZE_V6,
	.cpb	= MAX_CPB_SIZE_V6,
	.priv	= &mfc_buf_size_v6,
};

static struct s5p_mfc_buf_align mfc_buf_align_v6 = {
	.base = 0,
};

static struct s5p_mfc_variant mfc_drvdata_v6 = {
	.version	= MFC_VERSION_V6,
	.version_bit	= MFC_V6_BIT,
	.port_num	= MFC_NUM_PORTS_V6,
	.buf_size	= &buf_size_v6,
	.buf_align	= &mfc_buf_align_v6,
	.fw_name[0]     = "s5p-mfc-v6.fw",
	/*
	 * v6-v2 firmware contains bug fixes and interface change
	 * for init buffer command
	 */
	.fw_name[1]     = "s5p-mfc-v6-v2.fw",
};

static struct s5p_mfc_buf_size_v6 mfc_buf_size_v7 = {
	.dev_ctx	= MFC_CTX_BUF_SIZE_V7,
	.h264_dec_ctx	= MFC_H264_DEC_CTX_BUF_SIZE_V7,
	.other_dec_ctx	= MFC_OTHER_DEC_CTX_BUF_SIZE_V7,
	.h264_enc_ctx	= MFC_H264_ENC_CTX_BUF_SIZE_V7,
	.other_enc_ctx	= MFC_OTHER_ENC_CTX_BUF_SIZE_V7,
};

static struct s5p_mfc_buf_size buf_size_v7 = {
	.fw	= MAX_FW_SIZE_V7,
	.cpb	= MAX_CPB_SIZE_V7,
	.priv	= &mfc_buf_size_v7,
};

static struct s5p_mfc_buf_align mfc_buf_align_v7 = {
	.base = 0,
};

static struct s5p_mfc_variant mfc_drvdata_v7 = {
	.version	= MFC_VERSION_V7,
	.version_bit	= MFC_V7_BIT,
	.port_num	= MFC_NUM_PORTS_V7,
	.buf_size	= &buf_size_v7,
	.buf_align	= &mfc_buf_align_v7,
	.fw_name[0]     = "s5p-mfc-v7.fw",
};

static struct s5p_mfc_buf_size_v6 mfc_buf_size_v8 = {
	.dev_ctx	= MFC_CTX_BUF_SIZE_V8,
	.h264_dec_ctx	= MFC_H264_DEC_CTX_BUF_SIZE_V8,
	.other_dec_ctx	= MFC_OTHER_DEC_CTX_BUF_SIZE_V8,
	.h264_enc_ctx	= MFC_H264_ENC_CTX_BUF_SIZE_V8,
	.other_enc_ctx	= MFC_OTHER_ENC_CTX_BUF_SIZE_V8,
};

static struct s5p_mfc_buf_size buf_size_v8 = {
	.fw	= MAX_FW_SIZE_V8,
	.cpb	= MAX_CPB_SIZE_V8,
	.priv	= &mfc_buf_size_v8,
};

static struct s5p_mfc_buf_align mfc_buf_align_v8 = {
	.base = 0,
};

static struct s5p_mfc_variant mfc_drvdata_v8 = {
	.version	= MFC_VERSION_V8,
	.version_bit	= MFC_V8_BIT,
	.port_num	= MFC_NUM_PORTS_V8,
	.buf_size	= &buf_size_v8,
	.buf_align	= &mfc_buf_align_v8,
	.fw_name[0]     = "s5p-mfc-v8.fw",
};

static const struct of_device_id exynos_mfc_match[] = {
	{
		.compatible = "samsung,mfc-v5",
		.data = &mfc_drvdata_v5,
	}, {
		.compatible = "samsung,mfc-v6",
		.data = &mfc_drvdata_v6,
	}, {
		.compatible = "samsung,mfc-v7",
		.data = &mfc_drvdata_v7,
	}, {
		.compatible = "samsung,mfc-v8",
		.data = &mfc_drvdata_v8,
	},
	{},
};
MODULE_DEVICE_TABLE(of, exynos_mfc_match);

static void *mfc_get_drv_data(struct platform_device *pdev)
{
	struct s5p_mfc_variant *driver_data = NULL;
	const struct of_device_id *match;

	match = of_match_node(exynos_mfc_match, pdev->dev.of_node);
	if (match)
		driver_data = (struct s5p_mfc_variant *)match->data;

	return driver_data;
}

static struct platform_driver s5p_mfc_driver = {
	.probe		= s5p_mfc_probe,
	.remove		= s5p_mfc_remove,
	.driver	= {
		.name	= S5P_MFC_NAME,
		.pm	= &s5p_mfc_pm_ops,
		.of_match_table = exynos_mfc_match,
	},
};

module_platform_driver(s5p_mfc_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
MODULE_DESCRIPTION("Samsung S5P Multi Format Codec V4L2 driver");