/*
 *  TW5864 driver - video encoding functions
 *
 *  Copyright (C) 2016 Bluecherry, LLC <maintainers@bluecherrydvr.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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 */

#include <linux/module.h>
#include <media/v4l2-common.h>
#include <media/v4l2-event.h>
#include <media/videobuf2-dma-contig.h>

#include "tw5864.h"
#include "tw5864-reg.h"

#define QUANTIZATION_TABLE_LEN 96
#define VLC_LOOKUP_TABLE_LEN 1024

static const u16 forward_quantization_table[QUANTIZATION_TABLE_LEN] = {
	0x3333, 0x1f82, 0x3333, 0x1f82, 0x1f82, 0x147b, 0x1f82, 0x147b,
	0x3333, 0x1f82, 0x3333, 0x1f82, 0x1f82, 0x147b, 0x1f82, 0x147b,
	0x2e8c, 0x1d42, 0x2e8c, 0x1d42, 0x1d42, 0x1234, 0x1d42, 0x1234,
	0x2e8c, 0x1d42, 0x2e8c, 0x1d42, 0x1d42, 0x1234, 0x1d42, 0x1234,
	0x2762, 0x199a, 0x2762, 0x199a, 0x199a, 0x1062, 0x199a, 0x1062,
	0x2762, 0x199a, 0x2762, 0x199a, 0x199a, 0x1062, 0x199a, 0x1062,
	0x2492, 0x16c1, 0x2492, 0x16c1, 0x16c1, 0x0e3f, 0x16c1, 0x0e3f,
	0x2492, 0x16c1, 0x2492, 0x16c1, 0x16c1, 0x0e3f, 0x16c1, 0x0e3f,
	0x2000, 0x147b, 0x2000, 0x147b, 0x147b, 0x0d1b, 0x147b, 0x0d1b,
	0x2000, 0x147b, 0x2000, 0x147b, 0x147b, 0x0d1b, 0x147b, 0x0d1b,
	0x1c72, 0x11cf, 0x1c72, 0x11cf, 0x11cf, 0x0b4d, 0x11cf, 0x0b4d,
	0x1c72, 0x11cf, 0x1c72, 0x11cf, 0x11cf, 0x0b4d, 0x11cf, 0x0b4d
};

static const u16 inverse_quantization_table[QUANTIZATION_TABLE_LEN] = {
	0x800a, 0x800d, 0x800a, 0x800d, 0x800d, 0x8010, 0x800d, 0x8010,
	0x800a, 0x800d, 0x800a, 0x800d, 0x800d, 0x8010, 0x800d, 0x8010,
	0x800b, 0x800e, 0x800b, 0x800e, 0x800e, 0x8012, 0x800e, 0x8012,
	0x800b, 0x800e, 0x800b, 0x800e, 0x800e, 0x8012, 0x800e, 0x8012,
	0x800d, 0x8010, 0x800d, 0x8010, 0x8010, 0x8014, 0x8010, 0x8014,
	0x800d, 0x8010, 0x800d, 0x8010, 0x8010, 0x8014, 0x8010, 0x8014,
	0x800e, 0x8012, 0x800e, 0x8012, 0x8012, 0x8017, 0x8012, 0x8017,
	0x800e, 0x8012, 0x800e, 0x8012, 0x8012, 0x8017, 0x8012, 0x8017,
	0x8010, 0x8014, 0x8010, 0x8014, 0x8014, 0x8019, 0x8014, 0x8019,
	0x8010, 0x8014, 0x8010, 0x8014, 0x8014, 0x8019, 0x8014, 0x8019,
	0x8012, 0x8017, 0x8012, 0x8017, 0x8017, 0x801d, 0x8017, 0x801d,
	0x8012, 0x8017, 0x8012, 0x8017, 0x8017, 0x801d, 0x8017, 0x801d
};

static const u16 encoder_vlc_lookup_table[VLC_LOOKUP_TABLE_LEN] = {
	0x011, 0x000, 0x000, 0x000, 0x065, 0x021, 0x000, 0x000, 0x087, 0x064,
	0x031, 0x000, 0x097, 0x086, 0x075, 0x053, 0x0a7, 0x096, 0x085, 0x063,
	0x0b7, 0x0a6, 0x095, 0x074, 0x0df, 0x0b6, 0x0a5, 0x084, 0x0db, 0x0de,
	0x0b5, 0x094, 0x0d8, 0x0da, 0x0dd, 0x0a4, 0x0ef, 0x0ee, 0x0d9, 0x0b4,
	0x0eb, 0x0ea, 0x0ed, 0x0dc, 0x0ff, 0x0fe, 0x0e9, 0x0ec, 0x0fb, 0x0fa,
	0x0fd, 0x0e8, 0x10f, 0x0f1, 0x0f9, 0x0fc, 0x10b, 0x10e, 0x10d, 0x0f8,
	0x107, 0x10a, 0x109, 0x10c, 0x104, 0x106, 0x105, 0x108, 0x023, 0x000,
	0x000, 0x000, 0x06b, 0x022, 0x000, 0x000, 0x067, 0x057, 0x033, 0x000,
	0x077, 0x06a, 0x069, 0x045, 0x087, 0x066, 0x065, 0x044, 0x084, 0x076,
	0x075, 0x056, 0x097, 0x086, 0x085, 0x068, 0x0bf, 0x096, 0x095, 0x064,
	0x0bb, 0x0be, 0x0bd, 0x074, 0x0cf, 0x0ba, 0x0b9, 0x094, 0x0cb, 0x0ce,
	0x0cd, 0x0bc, 0x0c8, 0x0ca, 0x0c9, 0x0b8, 0x0df, 0x0de, 0x0dd, 0x0cc,
	0x0db, 0x0da, 0x0d9, 0x0dc, 0x0d7, 0x0eb, 0x0d6, 0x0d8, 0x0e9, 0x0e8,
	0x0ea, 0x0d1, 0x0e7, 0x0e6, 0x0e5, 0x0e4, 0x04f, 0x000, 0x000, 0x000,
	0x06f, 0x04e, 0x000, 0x000, 0x06b, 0x05f, 0x04d, 0x000, 0x068, 0x05c,
	0x05e, 0x04c, 0x07f, 0x05a, 0x05b, 0x04b, 0x07b, 0x058, 0x059, 0x04a,
	0x079, 0x06e, 0x06d, 0x049, 0x078, 0x06a, 0x069, 0x048, 0x08f, 0x07e,
	0x07d, 0x05d, 0x08b, 0x08e, 0x07a, 0x06c, 0x09f, 0x08a, 0x08d, 0x07c,
	0x09b, 0x09e, 0x089, 0x08c, 0x098, 0x09a, 0x09d, 0x088, 0x0ad, 0x097,
	0x099, 0x09c, 0x0a9, 0x0ac, 0x0ab, 0x0aa, 0x0a5, 0x0a8, 0x0a7, 0x0a6,
	0x0a1, 0x0a4, 0x0a3, 0x0a2, 0x021, 0x000, 0x000, 0x000, 0x067, 0x011,
	0x000, 0x000, 0x064, 0x066, 0x031, 0x000, 0x063, 0x073, 0x072, 0x065,
	0x062, 0x083, 0x082, 0x070, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x011, 0x010,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x011, 0x021, 0x020, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x023, 0x022, 0x021, 0x020, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x023, 0x022, 0x021, 0x031,
	0x030, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x023, 0x022, 0x033, 0x032, 0x031, 0x030, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x023, 0x030,
	0x031, 0x033, 0x032, 0x035, 0x034, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x037, 0x036, 0x035, 0x034, 0x033, 0x032,
	0x031, 0x041, 0x051, 0x061, 0x071, 0x081, 0x091, 0x0a1, 0x0b1, 0x000,
	0x002, 0x000, 0x0e4, 0x011, 0x0f4, 0x002, 0x024, 0x003, 0x005, 0x012,
	0x034, 0x013, 0x065, 0x024, 0x013, 0x063, 0x015, 0x022, 0x075, 0x034,
	0x044, 0x023, 0x023, 0x073, 0x054, 0x033, 0x033, 0x004, 0x043, 0x014,
	0x011, 0x043, 0x014, 0x001, 0x025, 0x015, 0x035, 0x025, 0x064, 0x055,
	0x045, 0x035, 0x074, 0x065, 0x085, 0x0d5, 0x012, 0x095, 0x055, 0x045,
	0x095, 0x0e5, 0x084, 0x075, 0x022, 0x0a5, 0x094, 0x085, 0x032, 0x0b5,
	0x003, 0x0c5, 0x001, 0x044, 0x0a5, 0x032, 0x0b5, 0x094, 0x0c5, 0x0a4,
	0x0a4, 0x054, 0x0d5, 0x0b4, 0x0b4, 0x064, 0x0f5, 0x0f5, 0x053, 0x0d4,
	0x0e5, 0x0c4, 0x105, 0x105, 0x0c4, 0x074, 0x063, 0x0e4, 0x0d4, 0x084,
	0x073, 0x0f4, 0x004, 0x005, 0x000, 0x053, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x011, 0x021, 0x031, 0x030, 0x011, 0x021, 0x020, 0x000,
	0x011, 0x010, 0x000, 0x000, 0x011, 0x033, 0x032, 0x043, 0x042, 0x053,
	0x052, 0x063, 0x062, 0x073, 0x072, 0x083, 0x082, 0x093, 0x092, 0x091,
	0x037, 0x036, 0x035, 0x034, 0x033, 0x045, 0x044, 0x043, 0x042, 0x053,
	0x052, 0x063, 0x062, 0x061, 0x060, 0x000, 0x045, 0x037, 0x036, 0x035,
	0x044, 0x043, 0x034, 0x033, 0x042, 0x053, 0x052, 0x061, 0x051, 0x060,
	0x000, 0x000, 0x053, 0x037, 0x045, 0x044, 0x036, 0x035, 0x034, 0x043,
	0x033, 0x042, 0x052, 0x051, 0x050, 0x000, 0x000, 0x000, 0x045, 0x044,
	0x043, 0x037, 0x036, 0x035, 0x034, 0x033, 0x042, 0x051, 0x041, 0x050,
	0x000, 0x000, 0x000, 0x000, 0x061, 0x051, 0x037, 0x036, 0x035, 0x034,
	0x033, 0x032, 0x041, 0x031, 0x060, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x061, 0x051, 0x035, 0x034, 0x033, 0x023, 0x032, 0x041, 0x031, 0x060,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x061, 0x041, 0x051, 0x033,
	0x023, 0x022, 0x032, 0x031, 0x060, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x061, 0x060, 0x041, 0x023, 0x022, 0x031, 0x021, 0x051,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x051, 0x050,
	0x031, 0x023, 0x022, 0x021, 0x041, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x040, 0x041, 0x031, 0x032, 0x011, 0x033,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x040, 0x041, 0x021, 0x011, 0x031, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x030, 0x031, 0x011, 0x021,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x020, 0x021, 0x011, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x010, 0x011,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000
};

static const unsigned int lambda_lookup_table[] = {
	0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020,
	0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020,
	0x0040, 0x0040, 0x0040, 0x0040, 0x0060, 0x0060, 0x0060, 0x0080,
	0x0080, 0x0080, 0x00a0, 0x00c0, 0x00c0, 0x00e0, 0x0100, 0x0120,
	0x0140, 0x0160, 0x01a0, 0x01c0, 0x0200, 0x0240, 0x0280, 0x02e0,
	0x0320, 0x03a0, 0x0400, 0x0480, 0x0500, 0x05a0, 0x0660, 0x0720,
	0x0800, 0x0900, 0x0a20, 0x0b60
};

static const unsigned int intra4x4_lambda3[] = {
	1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1,
	2, 2, 2, 2, 3, 3, 3, 4,
	4, 4, 5, 6, 6, 7, 8, 9,
	10, 11, 13, 14, 16, 18, 20, 23,
	25, 29, 32, 36, 40, 45, 51, 57,
	64, 72, 81, 91
};

static v4l2_std_id tw5864_get_v4l2_std(enum tw5864_vid_std std);
static enum tw5864_vid_std tw5864_from_v4l2_std(v4l2_std_id v4l2_std);

static void tw5864_handle_frame_task(unsigned long data);
static void tw5864_handle_frame(struct tw5864_h264_frame *frame);
static void tw5864_frame_interval_set(struct tw5864_input *input);

static int tw5864_queue_setup(struct vb2_queue *q, unsigned int *num_buffers,
			      unsigned int *num_planes, unsigned int sizes[],
			      struct device *alloc_ctxs[])
{
	if (*num_planes)
		return sizes[0] < H264_VLC_BUF_SIZE ? -EINVAL : 0;

	sizes[0] = H264_VLC_BUF_SIZE;
	*num_planes = 1;

	return 0;
}

static void tw5864_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct vb2_queue *vq = vb->vb2_queue;
	struct tw5864_input *dev = vb2_get_drv_priv(vq);
	struct tw5864_buf *buf = container_of(vbuf, struct tw5864_buf, vb);
	unsigned long flags;

	spin_lock_irqsave(&dev->slock, flags);
	list_add_tail(&buf->list, &dev->active);
	spin_unlock_irqrestore(&dev->slock, flags);
}

static int tw5864_input_std_get(struct tw5864_input *input,
				enum tw5864_vid_std *std)
{
	struct tw5864_dev *dev = input->root;
	u8 std_reg = tw_indir_readb(TW5864_INDIR_VIN_E(input->nr));

	*std = (std_reg & 0x70) >> 4;

	if (std_reg & 0x80) {
		dev_dbg(&dev->pci->dev,
			"Video format detection is in progress, please wait\n");
		return -EAGAIN;
	}

	return 0;
}

static int tw5864_enable_input(struct tw5864_input *input)
{
	struct tw5864_dev *dev = input->root;
	int nr = input->nr;
	unsigned long flags;
	int d1_width = 720;
	int d1_height;
	int frame_width_bus_value = 0;
	int frame_height_bus_value = 0;
	int reg_frame_bus = 0x1c;
	int fmt_reg_value = 0;
	int downscale_enabled = 0;

	dev_dbg(&dev->pci->dev, "Enabling channel %d\n", nr);

	input->frame_seqno = 0;
	input->frame_gop_seqno = 0;
	input->h264_idr_pic_id = 0;

	input->reg_dsp_qp = input->qp;
	input->reg_dsp_ref_mvp_lambda = lambda_lookup_table[input->qp];
	input->reg_dsp_i4x4_weight = intra4x4_lambda3[input->qp];
	input->reg_emu = TW5864_EMU_EN_LPF | TW5864_EMU_EN_BHOST
		| TW5864_EMU_EN_SEN | TW5864_EMU_EN_ME | TW5864_EMU_EN_DDR;
	input->reg_dsp = nr /* channel id */
		| TW5864_DSP_CHROM_SW
		| ((0xa << 8) & TW5864_DSP_MB_DELAY)
		;

	input->resolution = D1;

	d1_height = (input->std == STD_NTSC) ? 480 : 576;

	input->width = d1_width;
	input->height = d1_height;

	input->reg_interlacing = 0x4;

	switch (input->resolution) {
	case D1:
		frame_width_bus_value = 0x2cf;
		frame_height_bus_value = input->height - 1;
		reg_frame_bus = 0x1c;
		fmt_reg_value = 0;
		downscale_enabled = 0;
		input->reg_dsp_codec |= TW5864_CIF_MAP_MD | TW5864_HD1_MAP_MD;
		input->reg_emu |= TW5864_DSP_FRAME_TYPE_D1;
		input->reg_interlacing = TW5864_DI_EN | TW5864_DSP_INTER_ST;

		tw_setl(TW5864_FULL_HALF_FLAG, 1 << nr);
		break;
	case HD1:
		input->height /= 2;
		input->width /= 2;
		frame_width_bus_value = 0x2cf;
		frame_height_bus_value = input->height * 2 - 1;
		reg_frame_bus = 0x1c;
		fmt_reg_value = 0;
		downscale_enabled = 0;
		input->reg_dsp_codec |= TW5864_HD1_MAP_MD;
		input->reg_emu |= TW5864_DSP_FRAME_TYPE_D1;

		tw_clearl(TW5864_FULL_HALF_FLAG, 1 << nr);

		break;
	case CIF:
		input->height /= 4;
		input->width /= 2;
		frame_width_bus_value = 0x15f;
		frame_height_bus_value = input->height * 2 - 1;
		reg_frame_bus = 0x07;
		fmt_reg_value = 1;
		downscale_enabled = 1;
		input->reg_dsp_codec |= TW5864_CIF_MAP_MD;

		tw_clearl(TW5864_FULL_HALF_FLAG, 1 << nr);
		break;
	case QCIF:
		input->height /= 4;
		input->width /= 4;
		frame_width_bus_value = 0x15f;
		frame_height_bus_value = input->height * 2 - 1;
		reg_frame_bus = 0x07;
		fmt_reg_value = 1;
		downscale_enabled = 1;
		input->reg_dsp_codec |= TW5864_CIF_MAP_MD;

		tw_clearl(TW5864_FULL_HALF_FLAG, 1 << nr);
		break;
	}

	/* analog input width / 4 */
	tw_indir_writeb(TW5864_INDIR_IN_PIC_WIDTH(nr), d1_width / 4);
	tw_indir_writeb(TW5864_INDIR_IN_PIC_HEIGHT(nr), d1_height / 4);

	/* output width / 4 */
	tw_indir_writeb(TW5864_INDIR_OUT_PIC_WIDTH(nr), input->width / 4);
	tw_indir_writeb(TW5864_INDIR_OUT_PIC_HEIGHT(nr), input->height / 4);

	/*
	 * Crop width from 720 to 704.
	 * Above register settings need value 720 involved.
	 */
	input->width = 704;
	tw_indir_writeb(TW5864_INDIR_CROP_ETC,
			tw_indir_readb(TW5864_INDIR_CROP_ETC) |
			TW5864_INDIR_CROP_ETC_CROP_EN);

	tw_writel(TW5864_DSP_PIC_MAX_MB,
		  ((input->width / 16) << 8) | (input->height / 16));

	tw_writel(TW5864_FRAME_WIDTH_BUS_A(nr),
		  frame_width_bus_value);
	tw_writel(TW5864_FRAME_WIDTH_BUS_B(nr),
		  frame_width_bus_value);
	tw_writel(TW5864_FRAME_HEIGHT_BUS_A(nr),
		  frame_height_bus_value);
	tw_writel(TW5864_FRAME_HEIGHT_BUS_B(nr),
		  (frame_height_bus_value + 1) / 2 - 1);

	tw5864_frame_interval_set(input);

	if (downscale_enabled)
		tw_setl(TW5864_H264EN_CH_DNS, 1 << nr);

	tw_mask_shift_writel(TW5864_H264EN_CH_FMT_REG1, 0x3, 2 * nr,
			     fmt_reg_value);

	tw_mask_shift_writel((nr < 2
			      ? TW5864_H264EN_RATE_MAX_LINE_REG1
			      : TW5864_H264EN_RATE_MAX_LINE_REG2),
			     0x1f, 5 * (nr % 2),
			     input->std == STD_NTSC ? 29 : 24);

	tw_mask_shift_writel((nr < 2) ? TW5864_FRAME_BUS1 :
			     TW5864_FRAME_BUS2, 0xff, (nr % 2) * 8,
			     reg_frame_bus);

	spin_lock_irqsave(&dev->slock, flags);
	input->enabled = 1;
	spin_unlock_irqrestore(&dev->slock, flags);

	return 0;
}

void tw5864_request_encoded_frame(struct tw5864_input *input)
{
	struct tw5864_dev *dev = input->root;
	u32 enc_buf_id_new;

	tw_setl(TW5864_DSP_CODEC, TW5864_CIF_MAP_MD | TW5864_HD1_MAP_MD);
	tw_writel(TW5864_EMU, input->reg_emu);
	tw_writel(TW5864_INTERLACING, input->reg_interlacing);
	tw_writel(TW5864_DSP, input->reg_dsp);

	tw_writel(TW5864_DSP_QP, input->reg_dsp_qp);
	tw_writel(TW5864_DSP_REF_MVP_LAMBDA, input->reg_dsp_ref_mvp_lambda);
	tw_writel(TW5864_DSP_I4x4_WEIGHT, input->reg_dsp_i4x4_weight);
	tw_mask_shift_writel(TW5864_DSP_INTRA_MODE, TW5864_DSP_INTRA_MODE_MASK,
			     TW5864_DSP_INTRA_MODE_SHIFT,
			     TW5864_DSP_INTRA_MODE_16x16);

	if (input->frame_gop_seqno == 0) {
		/* Produce I-frame */
		tw_writel(TW5864_MOTION_SEARCH_ETC, TW5864_INTRA_EN);
		input->h264_idr_pic_id++;
		input->h264_idr_pic_id &= TW5864_DSP_REF_FRM;
	} else {
		/* Produce P-frame */
		tw_writel(TW5864_MOTION_SEARCH_ETC, TW5864_INTRA_EN |
			  TW5864_ME_EN | BIT(5) /* SRCH_OPT default */);
	}
	tw5864_prepare_frame_headers(input);
	tw_writel(TW5864_VLC,
		  TW5864_VLC_PCI_SEL |
		  ((input->tail_nb_bits + 24) << TW5864_VLC_BIT_ALIGN_SHIFT) |
		  input->reg_dsp_qp);

	enc_buf_id_new = tw_mask_shift_readl(TW5864_ENC_BUF_PTR_REC1, 0x3,
					     2 * input->nr);
	tw_writel(TW5864_DSP_ENC_ORG_PTR_REG,
		  enc_buf_id_new << TW5864_DSP_ENC_ORG_PTR_SHIFT);
	tw_writel(TW5864_DSP_ENC_REC,
		  enc_buf_id_new << 12 | ((enc_buf_id_new + 3) & 3));

	tw_writel(TW5864_SLICE, TW5864_START_NSLICE);
	tw_writel(TW5864_SLICE, 0);
}

static int tw5864_disable_input(struct tw5864_input *input)
{
	struct tw5864_dev *dev = input->root;
	unsigned long flags;

	dev_dbg(&dev->pci->dev, "Disabling channel %d\n", input->nr);

	spin_lock_irqsave(&dev->slock, flags);
	input->enabled = 0;
	spin_unlock_irqrestore(&dev->slock, flags);
	return 0;
}

static int tw5864_start_streaming(struct vb2_queue *q, unsigned int count)
{
	struct tw5864_input *input = vb2_get_drv_priv(q);
	int ret;

	ret = tw5864_enable_input(input);
	if (!ret)
		return 0;

	while (!list_empty(&input->active)) {
		struct tw5864_buf *buf = list_entry(input->active.next,
						    struct tw5864_buf, list);

		list_del(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
	}
	return ret;
}

static void tw5864_stop_streaming(struct vb2_queue *q)
{
	unsigned long flags;
	struct tw5864_input *input = vb2_get_drv_priv(q);

	tw5864_disable_input(input);

	spin_lock_irqsave(&input->slock, flags);
	if (input->vb) {
		vb2_buffer_done(&input->vb->vb.vb2_buf, VB2_BUF_STATE_ERROR);
		input->vb = NULL;
	}
	while (!list_empty(&input->active)) {
		struct tw5864_buf *buf = list_entry(input->active.next,
						    struct tw5864_buf, list);

		list_del(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
	}
	spin_unlock_irqrestore(&input->slock, flags);
}

static const struct vb2_ops tw5864_video_qops = {
	.queue_setup = tw5864_queue_setup,
	.buf_queue = tw5864_buf_queue,
	.start_streaming = tw5864_start_streaming,
	.stop_streaming = tw5864_stop_streaming,
	.wait_prepare = vb2_ops_wait_prepare,
	.wait_finish = vb2_ops_wait_finish,
};

static int tw5864_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct tw5864_input *input =
		container_of(ctrl->handler, struct tw5864_input, hdl);
	struct tw5864_dev *dev = input->root;
	unsigned long flags;

	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		tw_indir_writeb(TW5864_INDIR_VIN_A_BRIGHT(input->nr),
				(u8)ctrl->val);
		break;
	case V4L2_CID_HUE:
		tw_indir_writeb(TW5864_INDIR_VIN_7_HUE(input->nr),
				(u8)ctrl->val);
		break;
	case V4L2_CID_CONTRAST:
		tw_indir_writeb(TW5864_INDIR_VIN_9_CNTRST(input->nr),
				(u8)ctrl->val);
		break;
	case V4L2_CID_SATURATION:
		tw_indir_writeb(TW5864_INDIR_VIN_B_SAT_U(input->nr),
				(u8)ctrl->val);
		tw_indir_writeb(TW5864_INDIR_VIN_C_SAT_V(input->nr),
				(u8)ctrl->val);
		break;
	case V4L2_CID_MPEG_VIDEO_GOP_SIZE:
		input->gop = ctrl->val;
		return 0;
	case V4L2_CID_MPEG_VIDEO_H264_MIN_QP:
		spin_lock_irqsave(&input->slock, flags);
		input->qp = ctrl->val;
		input->reg_dsp_qp = input->qp;
		input->reg_dsp_ref_mvp_lambda = lambda_lookup_table[input->qp];
		input->reg_dsp_i4x4_weight = intra4x4_lambda3[input->qp];
		spin_unlock_irqrestore(&input->slock, flags);
		return 0;
	case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
		memset(input->md_threshold_grid_values, ctrl->val,
		       sizeof(input->md_threshold_grid_values));
		return 0;
	case V4L2_CID_DETECT_MD_MODE:
		return 0;
	case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
		/* input->md_threshold_grid_ctrl->p_new.p_u16 contains data */
		memcpy(input->md_threshold_grid_values,
		       input->md_threshold_grid_ctrl->p_new.p_u16,
		       sizeof(input->md_threshold_grid_values));
		return 0;
	}
	return 0;
}

static int tw5864_fmt_vid_cap(struct file *file, void *priv,
			      struct v4l2_format *f)
{
	struct tw5864_input *input = video_drvdata(file);

	f->fmt.pix.width = 704;
	switch (input->std) {
	default:
		WARN_ON_ONCE(1);
		return -EINVAL;
	case STD_NTSC:
		f->fmt.pix.height = 480;
		break;
	case STD_PAL:
	case STD_SECAM:
		f->fmt.pix.height = 576;
		break;
	}
	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
	f->fmt.pix.pixelformat = V4L2_PIX_FMT_H264;
	f->fmt.pix.sizeimage = H264_VLC_BUF_SIZE;
	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
	return 0;
}

static int tw5864_enum_input(struct file *file, void *priv,
			     struct v4l2_input *i)
{
	struct tw5864_input *input = video_drvdata(file);
	struct tw5864_dev *dev = input->root;

	u8 indir_0x000 = tw_indir_readb(TW5864_INDIR_VIN_0(input->nr));
	u8 indir_0x00d = tw_indir_readb(TW5864_INDIR_VIN_D(input->nr));
	u8 v1 = indir_0x000;
	u8 v2 = indir_0x00d;

	if (i->index)
		return -EINVAL;

	i->type = V4L2_INPUT_TYPE_CAMERA;
	snprintf(i->name, sizeof(i->name), "Encoder %d", input->nr);
	i->std = TW5864_NORMS;
	if (v1 & (1 << 7))
		i->status |= V4L2_IN_ST_NO_SYNC;
	if (!(v1 & (1 << 6)))
		i->status |= V4L2_IN_ST_NO_H_LOCK;
	if (v1 & (1 << 2))
		i->status |= V4L2_IN_ST_NO_SIGNAL;
	if (v1 & (1 << 1))
		i->status |= V4L2_IN_ST_NO_COLOR;
	if (v2 & (1 << 2))
		i->status |= V4L2_IN_ST_MACROVISION;

	return 0;
}

static int tw5864_g_input(struct file *file, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int tw5864_s_input(struct file *file, void *priv, unsigned int i)
{
	if (i)
		return -EINVAL;
	return 0;
}

static int tw5864_querycap(struct file *file, void *priv,
			   struct v4l2_capability *cap)
{
	struct tw5864_input *input = video_drvdata(file);

	strcpy(cap->driver, "tw5864");
	snprintf(cap->card, sizeof(cap->card), "TW5864 Encoder %d",
		 input->nr);
	sprintf(cap->bus_info, "PCI:%s", pci_name(input->root->pci));
	return 0;
}

static int tw5864_querystd(struct file *file, void *priv, v4l2_std_id *std)
{
	struct tw5864_input *input = video_drvdata(file);
	enum tw5864_vid_std tw_std;
	int ret;

	ret = tw5864_input_std_get(input, &tw_std);
	if (ret)
		return ret;
	*std = tw5864_get_v4l2_std(tw_std);

	return 0;
}

static int tw5864_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
	struct tw5864_input *input = video_drvdata(file);

	*std = input->v4l2_std;
	return 0;
}

static int tw5864_s_std(struct file *file, void *priv, v4l2_std_id std)
{
	struct tw5864_input *input = video_drvdata(file);
	struct tw5864_dev *dev = input->root;

	input->v4l2_std = std;
	input->std = tw5864_from_v4l2_std(std);
	tw_indir_writeb(TW5864_INDIR_VIN_E(input->nr), input->std);
	return 0;
}

static int tw5864_enum_fmt_vid_cap(struct file *file, void *priv,
				   struct v4l2_fmtdesc *f)
{
	if (f->index)
		return -EINVAL;

	f->pixelformat = V4L2_PIX_FMT_H264;

	return 0;
}

static int tw5864_subscribe_event(struct v4l2_fh *fh,
				  const struct v4l2_event_subscription *sub)
{
	switch (sub->type) {
	case V4L2_EVENT_MOTION_DET:
		/*
		 * Allow for up to 30 events (1 second for NTSC) to be stored.
		 */
		return v4l2_event_subscribe(fh, sub, 30, NULL);
	default:
		return v4l2_ctrl_subscribe_event(fh, sub);
	}
}

static void tw5864_frame_interval_set(struct tw5864_input *input)
{
	/*
	 * This register value seems to follow such approach: In each second
	 * interval, when processing Nth frame, it checks Nth bit of register
	 * value and, if the bit is 1, it processes the frame, otherwise the
	 * frame is discarded.
	 * So unary representation would work, but more or less equal gaps
	 * between the frames should be preserved.
	 *
	 * For 1 FPS - 0x00000001
	 * 00000000 00000000 00000000 00000001
	 *
	 * For max FPS - set all 25/30 lower bits:
	 * 00111111 11111111 11111111 11111111 (NTSC)
	 * 00000001 11111111 11111111 11111111 (PAL)
	 *
	 * For half of max FPS - use such pattern:
	 * 00010101 01010101 01010101 01010101 (NTSC)
	 * 00000001 01010101 01010101 01010101 (PAL)
	 *
	 * Et cetera.
	 *
	 * The value supplied to hardware is capped by mask of 25/30 lower bits.
	 */
	struct tw5864_dev *dev = input->root;
	u32 unary_framerate = 0;
	int shift = 0;
	int std_max_fps = input->std == STD_NTSC ? 30 : 25;

	for (shift = 0; shift < std_max_fps; shift += input->frame_interval)
		unary_framerate |= 0x00000001 << shift;

	tw_writel(TW5864_H264EN_RATE_CNTL_LO_WORD(input->nr, 0),
		  unary_framerate >> 16);
	tw_writel(TW5864_H264EN_RATE_CNTL_HI_WORD(input->nr, 0),
		  unary_framerate & 0xffff);
}

static int tw5864_frameinterval_get(struct tw5864_input *input,
				    struct v4l2_fract *frameinterval)
{
	struct tw5864_dev *dev = input->root;

	switch (input->std) {
	case STD_NTSC:
		frameinterval->numerator = 1001;
		frameinterval->denominator = 30000;
		break;
	case STD_PAL:
	case STD_SECAM:
		frameinterval->numerator = 1;
		frameinterval->denominator = 25;
		break;
	default:
		dev_warn(&dev->pci->dev, "tw5864_frameinterval_get requested for unknown std %d\n",
			 input->std);
		return -EINVAL;
	}

	return 0;
}

static int tw5864_enum_framesizes(struct file *file, void *priv,
				  struct v4l2_frmsizeenum *fsize)
{
	struct tw5864_input *input = video_drvdata(file);

	if (fsize->index > 0)
		return -EINVAL;
	if (fsize->pixel_format != V4L2_PIX_FMT_H264)
		return -EINVAL;

	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
	fsize->discrete.width = 704;
	fsize->discrete.height = input->std == STD_NTSC ? 480 : 576;

	return 0;
}

static int tw5864_enum_frameintervals(struct file *file, void *priv,
				      struct v4l2_frmivalenum *fintv)
{
	struct tw5864_input *input = video_drvdata(file);
	struct v4l2_fract frameinterval;
	int std_max_fps = input->std == STD_NTSC ? 30 : 25;
	struct v4l2_frmsizeenum fsize = { .index = fintv->index,
		.pixel_format = fintv->pixel_format };
	int ret;

	ret = tw5864_enum_framesizes(file, priv, &fsize);
	if (ret)
		return ret;

	if (fintv->width != fsize.discrete.width ||
	    fintv->height != fsize.discrete.height)
		return -EINVAL;

	fintv->type = V4L2_FRMIVAL_TYPE_STEPWISE;

	ret = tw5864_frameinterval_get(input, &frameinterval);
	fintv->stepwise.step = frameinterval;
	fintv->stepwise.min = frameinterval;
	fintv->stepwise.max = frameinterval;
	fintv->stepwise.max.numerator *= std_max_fps;

	return ret;
}

static int tw5864_g_parm(struct file *file, void *priv,
			 struct v4l2_streamparm *sp)
{
	struct tw5864_input *input = video_drvdata(file);
	struct v4l2_captureparm *cp = &sp->parm.capture;
	int ret;

	cp->capability = V4L2_CAP_TIMEPERFRAME;

	ret = tw5864_frameinterval_get(input, &cp->timeperframe);
	cp->timeperframe.numerator *= input->frame_interval;
	cp->capturemode = 0;
	cp->readbuffers = 2;

	return ret;
}

static int tw5864_s_parm(struct file *file, void *priv,
			 struct v4l2_streamparm *sp)
{
	struct tw5864_input *input = video_drvdata(file);
	struct v4l2_fract *t = &sp->parm.capture.timeperframe;
	struct v4l2_fract time_base;
	int ret;

	ret = tw5864_frameinterval_get(input, &time_base);
	if (ret)
		return ret;

	if (!t->numerator || !t->denominator) {
		t->numerator = time_base.numerator * input->frame_interval;
		t->denominator = time_base.denominator;
	} else if (t->denominator != time_base.denominator) {
		t->numerator = t->numerator * time_base.denominator /
			t->denominator;
		t->denominator = time_base.denominator;
	}

	input->frame_interval = t->numerator / time_base.numerator;
	if (input->frame_interval < 1)
		input->frame_interval = 1;
	tw5864_frame_interval_set(input);
	return tw5864_g_parm(file, priv, sp);
}

static const struct v4l2_ctrl_ops tw5864_ctrl_ops = {
	.s_ctrl = tw5864_s_ctrl,
};

static const struct v4l2_file_operations video_fops = {
	.owner = THIS_MODULE,
	.open = v4l2_fh_open,
	.release = vb2_fop_release,
	.read = vb2_fop_read,
	.poll = vb2_fop_poll,
	.mmap = vb2_fop_mmap,
	.unlocked_ioctl = video_ioctl2,
};

#ifdef CONFIG_VIDEO_ADV_DEBUG

#define INDIR_SPACE_MAP_SHIFT 0x100000

static int tw5864_g_reg(struct file *file, void *fh,
			struct v4l2_dbg_register *reg)
{
	struct tw5864_input *input = video_drvdata(file);
	struct tw5864_dev *dev = input->root;

	if (reg->reg < INDIR_SPACE_MAP_SHIFT) {
		if (reg->reg > 0x87fff)
			return -EINVAL;
		reg->size = 4;
		reg->val = tw_readl(reg->reg);
	} else {
		__u64 indir_addr = reg->reg - INDIR_SPACE_MAP_SHIFT;

		if (indir_addr > 0xefe)
			return -EINVAL;
		reg->size = 1;
		reg->val = tw_indir_readb(reg->reg);
	}
	return 0;
}

static int tw5864_s_reg(struct file *file, void *fh,
			const struct v4l2_dbg_register *reg)
{
	struct tw5864_input *input = video_drvdata(file);
	struct tw5864_dev *dev = input->root;

	if (reg->reg < INDIR_SPACE_MAP_SHIFT) {
		if (reg->reg > 0x87fff)
			return -EINVAL;
		tw_writel(reg->reg, reg->val);
	} else {
		__u64 indir_addr = reg->reg - INDIR_SPACE_MAP_SHIFT;

		if (indir_addr > 0xefe)
			return -EINVAL;
		tw_indir_writeb(reg->reg, reg->val);
	}
	return 0;
}
#endif

static const struct v4l2_ioctl_ops video_ioctl_ops = {
	.vidioc_querycap = tw5864_querycap,
	.vidioc_enum_fmt_vid_cap = tw5864_enum_fmt_vid_cap,
	.vidioc_reqbufs = vb2_ioctl_reqbufs,
	.vidioc_create_bufs = vb2_ioctl_create_bufs,
	.vidioc_querybuf = vb2_ioctl_querybuf,
	.vidioc_qbuf = vb2_ioctl_qbuf,
	.vidioc_dqbuf = vb2_ioctl_dqbuf,
	.vidioc_expbuf = vb2_ioctl_expbuf,
	.vidioc_querystd = tw5864_querystd,
	.vidioc_s_std = tw5864_s_std,
	.vidioc_g_std = tw5864_g_std,
	.vidioc_enum_input = tw5864_enum_input,
	.vidioc_g_input = tw5864_g_input,
	.vidioc_s_input = tw5864_s_input,
	.vidioc_streamon = vb2_ioctl_streamon,
	.vidioc_streamoff = vb2_ioctl_streamoff,
	.vidioc_try_fmt_vid_cap = tw5864_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap = tw5864_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap = tw5864_fmt_vid_cap,
	.vidioc_log_status = v4l2_ctrl_log_status,
	.vidioc_subscribe_event = tw5864_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
	.vidioc_enum_framesizes = tw5864_enum_framesizes,
	.vidioc_enum_frameintervals = tw5864_enum_frameintervals,
	.vidioc_s_parm = tw5864_s_parm,
	.vidioc_g_parm = tw5864_g_parm,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register = tw5864_g_reg,
	.vidioc_s_register = tw5864_s_reg,
#endif
};

static const struct video_device tw5864_video_template = {
	.name = "tw5864_video",
	.fops = &video_fops,
	.ioctl_ops = &video_ioctl_ops,
	.release = video_device_release_empty,
	.tvnorms = TW5864_NORMS,
	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
		V4L2_CAP_STREAMING,
};

/* Motion Detection Threshold matrix */
static const struct v4l2_ctrl_config tw5864_md_thresholds = {
	.ops = &tw5864_ctrl_ops,
	.id = V4L2_CID_DETECT_MD_THRESHOLD_GRID,
	.dims = {MD_CELLS_HOR, MD_CELLS_VERT},
	.def = 14,
	/* See tw5864_md_metric_from_mvd() */
	.max = 2 * 0x0f,
	.step = 1,
};

static int tw5864_video_input_init(struct tw5864_input *dev, int video_nr);
static void tw5864_video_input_fini(struct tw5864_input *dev);
static void tw5864_encoder_tables_upload(struct tw5864_dev *dev);

int tw5864_video_init(struct tw5864_dev *dev, int *video_nr)
{
	int i;
	int ret;
	unsigned long flags;
	int last_dma_allocated = -1;
	int last_input_nr_registered = -1;

	for (i = 0; i < H264_BUF_CNT; i++) {
		struct tw5864_h264_frame *frame = &dev->h264_buf[i];

		frame->vlc.addr = dma_alloc_coherent(&dev->pci->dev,
						     H264_VLC_BUF_SIZE,
						     &frame->vlc.dma_addr,
						     GFP_KERNEL | GFP_DMA32);
		if (!frame->vlc.addr) {
			dev_err(&dev->pci->dev, "dma alloc fail\n");
			ret = -ENOMEM;
			goto free_dma;
		}
		frame->mv.addr = dma_alloc_coherent(&dev->pci->dev,
						    H264_MV_BUF_SIZE,
						    &frame->mv.dma_addr,
						    GFP_KERNEL | GFP_DMA32);
		if (!frame->mv.addr) {
			dev_err(&dev->pci->dev, "dma alloc fail\n");
			ret = -ENOMEM;
			dma_free_coherent(&dev->pci->dev, H264_VLC_BUF_SIZE,
					  frame->vlc.addr, frame->vlc.dma_addr);
			goto free_dma;
		}
		last_dma_allocated = i;
	}

	tw5864_encoder_tables_upload(dev);

	/* Picture is distorted without this block */
	/* use falling edge to sample 54M to 108M */
	tw_indir_writeb(TW5864_INDIR_VD_108_POL, TW5864_INDIR_VD_108_POL_BOTH);
	tw_indir_writeb(TW5864_INDIR_CLK0_SEL, 0x00);

	tw_indir_writeb(TW5864_INDIR_DDRA_DLL_DQS_SEL0, 0x02);
	tw_indir_writeb(TW5864_INDIR_DDRA_DLL_DQS_SEL1, 0x02);
	tw_indir_writeb(TW5864_INDIR_DDRA_DLL_CLK90_SEL, 0x02);
	tw_indir_writeb(TW5864_INDIR_DDRB_DLL_DQS_SEL0, 0x02);
	tw_indir_writeb(TW5864_INDIR_DDRB_DLL_DQS_SEL1, 0x02);
	tw_indir_writeb(TW5864_INDIR_DDRB_DLL_CLK90_SEL, 0x02);

	/* video input reset */
	tw_indir_writeb(TW5864_INDIR_RESET, 0);
	tw_indir_writeb(TW5864_INDIR_RESET, TW5864_INDIR_RESET_VD |
			TW5864_INDIR_RESET_DLL | TW5864_INDIR_RESET_MUX_CORE);
	msleep(20);

	/*
	 * Select Part A mode for all channels.
	 * tw_setl instead of tw_clearl for Part B mode.
	 *
	 * I guess "Part B" is primarily for downscaled version of same channel
	 * which goes in Part A of same bus
	 */
	tw_writel(TW5864_FULL_HALF_MODE_SEL, 0);

	tw_indir_writeb(TW5864_INDIR_PV_VD_CK_POL,
			TW5864_INDIR_PV_VD_CK_POL_VD(0) |
			TW5864_INDIR_PV_VD_CK_POL_VD(1) |
			TW5864_INDIR_PV_VD_CK_POL_VD(2) |
			TW5864_INDIR_PV_VD_CK_POL_VD(3));

	spin_lock_irqsave(&dev->slock, flags);
	dev->encoder_busy = 0;
	dev->h264_buf_r_index = 0;
	dev->h264_buf_w_index = 0;
	tw_writel(TW5864_VLC_STREAM_BASE_ADDR,
		  dev->h264_buf[dev->h264_buf_w_index].vlc.dma_addr);
	tw_writel(TW5864_MV_STREAM_BASE_ADDR,
		  dev->h264_buf[dev->h264_buf_w_index].mv.dma_addr);
	spin_unlock_irqrestore(&dev->slock, flags);

	tw_writel(TW5864_SEN_EN_CH, 0x000f);
	tw_writel(TW5864_H264EN_CH_EN, 0x000f);

	tw_writel(TW5864_H264EN_BUS0_MAP, 0x00000000);
	tw_writel(TW5864_H264EN_BUS1_MAP, 0x00001111);
	tw_writel(TW5864_H264EN_BUS2_MAP, 0x00002222);
	tw_writel(TW5864_H264EN_BUS3_MAP, 0x00003333);

	/*
	 * Quote from Intersil (manufacturer):
	 * 0x0038 is managed by HW, and by default it won't pass the pointer set
	 * at 0x0010. So if you don't do encoding, 0x0038 should stay at '3'
	 * (with 4 frames in buffer). If you encode one frame and then move
	 * 0x0010 to '1' for example, HW will take one more frame and set it to
	 * buffer #0, and then you should see 0x0038 is set to '0'.  There is
	 * only one HW encoder engine, so 4 channels cannot get encoded
	 * simultaneously. But each channel does have its own buffer (for
	 * original frames and reconstructed frames). So there is no problem to
	 * manage encoding for 4 channels at same time and no need to force
	 * I-frames in switching channels.
	 * End of quote.
	 *
	 * If we set 0x0010 (TW5864_ENC_BUF_PTR_REC1) to 0 (for any channel), we
	 * have no "rolling" (until we change this value).
	 * If we set 0x0010 (TW5864_ENC_BUF_PTR_REC1) to 0x3, it starts to roll
	 * continuously together with 0x0038.
	 */
	tw_writel(TW5864_ENC_BUF_PTR_REC1, 0x00ff);
	tw_writel(TW5864_PCI_INTTM_SCALE, 0);

	tw_writel(TW5864_INTERLACING, TW5864_DI_EN);
	tw_writel(TW5864_MASTER_ENB_REG, TW5864_PCI_VLC_INTR_ENB);
	tw_writel(TW5864_PCI_INTR_CTL,
		  TW5864_TIMER_INTR_ENB | TW5864_PCI_MAST_ENB |
		  TW5864_MVD_VLC_MAST_ENB);

	dev->irqmask |= TW5864_INTR_VLC_DONE | TW5864_INTR_TIMER;
	tw5864_irqmask_apply(dev);

	tasklet_init(&dev->tasklet, tw5864_handle_frame_task,
		     (unsigned long)dev);

	for (i = 0; i < TW5864_INPUTS; i++) {
		dev->inputs[i].root = dev;
		dev->inputs[i].nr = i;
		ret = tw5864_video_input_init(&dev->inputs[i], video_nr[i]);
		if (ret)
			goto fini_video_inputs;
		last_input_nr_registered = i;
	}

	return 0;

fini_video_inputs:
	for (i = last_input_nr_registered; i >= 0; i--)
		tw5864_video_input_fini(&dev->inputs[i]);

	tasklet_kill(&dev->tasklet);

free_dma:
	for (i = last_dma_allocated; i >= 0; i--) {
		dma_free_coherent(&dev->pci->dev, H264_VLC_BUF_SIZE,
				  dev->h264_buf[i].vlc.addr,
				  dev->h264_buf[i].vlc.dma_addr);
		dma_free_coherent(&dev->pci->dev, H264_MV_BUF_SIZE,
				  dev->h264_buf[i].mv.addr,
				  dev->h264_buf[i].mv.dma_addr);
	}

	return ret;
}

static int tw5864_video_input_init(struct tw5864_input *input, int video_nr)
{
	struct tw5864_dev *dev = input->root;
	int ret;
	struct v4l2_ctrl_handler *hdl = &input->hdl;

	mutex_init(&input->lock);
	spin_lock_init(&input->slock);

	/* setup video buffers queue */
	INIT_LIST_HEAD(&input->active);
	input->vidq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	input->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	input->vidq.io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
	input->vidq.ops = &tw5864_video_qops;
	input->vidq.mem_ops = &vb2_dma_contig_memops;
	input->vidq.drv_priv = input;
	input->vidq.gfp_flags = 0;
	input->vidq.buf_struct_size = sizeof(struct tw5864_buf);
	input->vidq.lock = &input->lock;
	input->vidq.min_buffers_needed = 2;
	input->vidq.dev = &input->root->pci->dev;
	ret = vb2_queue_init(&input->vidq);
	if (ret)
		goto free_mutex;

	input->vdev = tw5864_video_template;
	input->vdev.v4l2_dev = &input->root->v4l2_dev;
	input->vdev.lock = &input->lock;
	input->vdev.queue = &input->vidq;
	video_set_drvdata(&input->vdev, input);

	/* Initialize the device control structures */
	v4l2_ctrl_handler_init(hdl, 6);
	v4l2_ctrl_new_std(hdl, &tw5864_ctrl_ops,
			  V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
	v4l2_ctrl_new_std(hdl, &tw5864_ctrl_ops,
			  V4L2_CID_CONTRAST, 0, 255, 1, 100);
	v4l2_ctrl_new_std(hdl, &tw5864_ctrl_ops,
			  V4L2_CID_SATURATION, 0, 255, 1, 128);
	v4l2_ctrl_new_std(hdl, &tw5864_ctrl_ops, V4L2_CID_HUE, -128, 127, 1, 0);
	v4l2_ctrl_new_std(hdl, &tw5864_ctrl_ops, V4L2_CID_MPEG_VIDEO_GOP_SIZE,
			  1, MAX_GOP_SIZE, 1, GOP_SIZE);
	v4l2_ctrl_new_std(hdl, &tw5864_ctrl_ops,
			  V4L2_CID_MPEG_VIDEO_H264_MIN_QP, 28, 51, 1, QP_VALUE);
	v4l2_ctrl_new_std_menu(hdl, &tw5864_ctrl_ops,
			       V4L2_CID_DETECT_MD_MODE,
			       V4L2_DETECT_MD_MODE_THRESHOLD_GRID, 0,
			       V4L2_DETECT_MD_MODE_DISABLED);
	v4l2_ctrl_new_std(hdl, &tw5864_ctrl_ops,
			  V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD,
			  tw5864_md_thresholds.min, tw5864_md_thresholds.max,
			  tw5864_md_thresholds.step, tw5864_md_thresholds.def);
	input->md_threshold_grid_ctrl =
		v4l2_ctrl_new_custom(hdl, &tw5864_md_thresholds, NULL);
	if (hdl->error) {
		ret = hdl->error;
		goto free_v4l2_hdl;
	}
	input->vdev.ctrl_handler = hdl;
	v4l2_ctrl_handler_setup(hdl);

	input->qp = QP_VALUE;
	input->gop = GOP_SIZE;
	input->frame_interval = 1;

	ret = video_register_device(&input->vdev, VFL_TYPE_GRABBER, video_nr);
	if (ret)
		goto free_v4l2_hdl;

	dev_info(&input->root->pci->dev, "Registered video device %s\n",
		 video_device_node_name(&input->vdev));

	/*
	 * Set default video standard. Doesn't matter which, the detected value
	 * will be found out by VIDIOC_QUERYSTD handler.
	 */
	input->v4l2_std = V4L2_STD_NTSC_M;
	input->std = STD_NTSC;

	tw_indir_writeb(TW5864_INDIR_VIN_E(video_nr), 0x07);
	/* to initiate auto format recognition */
	tw_indir_writeb(TW5864_INDIR_VIN_F(video_nr), 0xff);

	return 0;

free_v4l2_hdl:
	v4l2_ctrl_handler_free(hdl);
	vb2_queue_release(&input->vidq);
free_mutex:
	mutex_destroy(&input->lock);

	return ret;
}

static void tw5864_video_input_fini(struct tw5864_input *dev)
{
	video_unregister_device(&dev->vdev);
	v4l2_ctrl_handler_free(&dev->hdl);
	vb2_queue_release(&dev->vidq);
}

void tw5864_video_fini(struct tw5864_dev *dev)
{
	int i;

	tasklet_kill(&dev->tasklet);

	for (i = 0; i < TW5864_INPUTS; i++)
		tw5864_video_input_fini(&dev->inputs[i]);

	for (i = 0; i < H264_BUF_CNT; i++) {
		dma_free_coherent(&dev->pci->dev, H264_VLC_BUF_SIZE,
				  dev->h264_buf[i].vlc.addr,
				  dev->h264_buf[i].vlc.dma_addr);
		dma_free_coherent(&dev->pci->dev, H264_MV_BUF_SIZE,
				  dev->h264_buf[i].mv.addr,
				  dev->h264_buf[i].mv.dma_addr);
	}
}

void tw5864_prepare_frame_headers(struct tw5864_input *input)
{
	struct tw5864_buf *vb = input->vb;
	u8 *dst;
	size_t dst_space;
	unsigned long flags;

	if (!vb) {
		spin_lock_irqsave(&input->slock, flags);
		if (list_empty(&input->active)) {
			spin_unlock_irqrestore(&input->slock, flags);
			input->vb = NULL;
			return;
		}
		vb = list_first_entry(&input->active, struct tw5864_buf, list);
		list_del(&vb->list);
		spin_unlock_irqrestore(&input->slock, flags);
	}

	dst = vb2_plane_vaddr(&vb->vb.vb2_buf, 0);
	dst_space = vb2_plane_size(&vb->vb.vb2_buf, 0);

	/*
	 * Low-level bitstream writing functions don't have a fine way to say
	 * correctly that supplied buffer is too small. So we just check there
	 * and warn, and don't care at lower level.
	 * Currently all headers take below 32 bytes.
	 * The buffer is supposed to have plenty of free space at this point,
	 * anyway.
	 */
	if (WARN_ON_ONCE(dst_space < 128))
		return;

	/*
	 * Generate H264 headers:
	 * If this is first frame, put SPS and PPS
	 */
	if (input->frame_gop_seqno == 0)
		tw5864_h264_put_stream_header(&dst, &dst_space, input->qp,
					      input->width, input->height);

	/* Put slice header */
	tw5864_h264_put_slice_header(&dst, &dst_space, input->h264_idr_pic_id,
				     input->frame_gop_seqno,
				     &input->tail_nb_bits, &input->tail);
	input->vb = vb;
	input->buf_cur_ptr = dst;
	input->buf_cur_space_left = dst_space;
}

/*
 * Returns heuristic motion detection metric value from known components of
 * hardware-provided Motion Vector Data.
 */
static unsigned int tw5864_md_metric_from_mvd(u32 mvd)
{
	/*
	 * Format of motion vector data exposed by tw5864, according to
	 * manufacturer:
	 * mv_x 10 bits
	 * mv_y 10 bits
	 * non_zero_members 8 bits
	 * mb_type 3 bits
	 * reserved 1 bit
	 *
	 * non_zero_members: number of non-zero residuals in each macro block
	 * after quantization
	 *
	 * unsigned int reserved = mvd >> 31;
	 * unsigned int mb_type = (mvd >> 28) & 0x7;
	 * unsigned int non_zero_members = (mvd >> 20) & 0xff;
	 */
	unsigned int mv_y = (mvd >> 10) & 0x3ff;
	unsigned int mv_x = mvd & 0x3ff;

	/* heuristic: */
	mv_x &= 0x0f;
	mv_y &= 0x0f;

	return mv_y + mv_x;
}

static int tw5864_is_motion_triggered(struct tw5864_h264_frame *frame)
{
	struct tw5864_input *input = frame->input;
	u32 *mv = (u32 *)frame->mv.addr;
	int i;
	int detected = 0;

	for (i = 0; i < MD_CELLS; i++) {
		const u16 thresh = input->md_threshold_grid_values[i];
		const unsigned int metric = tw5864_md_metric_from_mvd(mv[i]);

		if (metric > thresh)
			detected = 1;

		if (detected)
			break;
	}
	return detected;
}

static void tw5864_handle_frame_task(unsigned long data)
{
	struct tw5864_dev *dev = (struct tw5864_dev *)data;
	unsigned long flags;
	int batch_size = H264_BUF_CNT;

	spin_lock_irqsave(&dev->slock, flags);
	while (dev->h264_buf_r_index != dev->h264_buf_w_index && batch_size--) {
		struct tw5864_h264_frame *frame =
			&dev->h264_buf[dev->h264_buf_r_index];

		spin_unlock_irqrestore(&dev->slock, flags);
		dma_sync_single_for_cpu(&dev->pci->dev, frame->vlc.dma_addr,
					H264_VLC_BUF_SIZE, DMA_FROM_DEVICE);
		dma_sync_single_for_cpu(&dev->pci->dev, frame->mv.dma_addr,
					H264_MV_BUF_SIZE, DMA_FROM_DEVICE);
		tw5864_handle_frame(frame);
		dma_sync_single_for_device(&dev->pci->dev, frame->vlc.dma_addr,
					   H264_VLC_BUF_SIZE, DMA_FROM_DEVICE);
		dma_sync_single_for_device(&dev->pci->dev, frame->mv.dma_addr,
					   H264_MV_BUF_SIZE, DMA_FROM_DEVICE);
		spin_lock_irqsave(&dev->slock, flags);

		dev->h264_buf_r_index++;
		dev->h264_buf_r_index %= H264_BUF_CNT;
	}
	spin_unlock_irqrestore(&dev->slock, flags);
}

#ifdef DEBUG
static u32 tw5864_vlc_checksum(u32 *data, int len)
{
	u32 val, count_len = len;

	val = *data++;
	while (((count_len >> 2) - 1) > 0) {
		val ^= *data++;
		count_len -= 4;
	}
	val ^= htonl((len >> 2));
	return val;
}
#endif

static void tw5864_handle_frame(struct tw5864_h264_frame *frame)
{
#define SKIP_VLCBUF_BYTES 3
	struct tw5864_input *input = frame->input;
	struct tw5864_dev *dev = input->root;
	struct tw5864_buf *vb;
	struct vb2_v4l2_buffer *v4l2_buf;
	int frame_len = frame->vlc_len - SKIP_VLCBUF_BYTES;
	u8 *dst = input->buf_cur_ptr;
	u8 tail_mask, vlc_mask = 0;
	int i;
	u8 vlc_first_byte = ((u8 *)(frame->vlc.addr + SKIP_VLCBUF_BYTES))[0];
	unsigned long flags;
	int zero_run;
	u8 *src;
	u8 *src_end;

#ifdef DEBUG
	if (frame->checksum !=
	    tw5864_vlc_checksum((u32 *)frame->vlc.addr, frame_len))
		dev_err(&dev->pci->dev,
			"Checksum of encoded frame doesn't match!\n");
#endif

	spin_lock_irqsave(&input->slock, flags);
	vb = input->vb;
	input->vb = NULL;
	spin_unlock_irqrestore(&input->slock, flags);

	if (!vb) { /* Gone because of disabling */
		dev_dbg(&dev->pci->dev, "vb is empty, dropping frame\n");
		return;
	}

	v4l2_buf = to_vb2_v4l2_buffer(&vb->vb.vb2_buf);

	/*
	 * Check for space.
	 * Mind the overhead of startcode emulation prevention.
	 */
	if (input->buf_cur_space_left < frame_len * 5 / 4) {
		dev_err_once(&dev->pci->dev,
			     "Left space in vb2 buffer, %d bytes, is less than considered safely enough to put frame of length %d. Dropping this frame.\n",
			     input->buf_cur_space_left, frame_len);
		return;
	}

	for (i = 0; i < 8 - input->tail_nb_bits; i++)
		vlc_mask |= 1 << i;
	tail_mask = (~vlc_mask) & 0xff;

	dst[0] = (input->tail & tail_mask) | (vlc_first_byte & vlc_mask);
	frame_len--;
	dst++;

	/* H.264 startcode emulation prevention */
	src = frame->vlc.addr + SKIP_VLCBUF_BYTES + 1;
	src_end = src + frame_len;
	zero_run = 0;
	for (; src < src_end; src++) {
		if (zero_run < 2) {
			if (*src == 0)
				++zero_run;
			else
				zero_run = 0;
		} else {
			if ((*src & ~0x03) == 0)
				*dst++ = 0x03;
			zero_run = *src == 0;
		}
		*dst++ = *src;
	}

	vb2_set_plane_payload(&vb->vb.vb2_buf, 0,
			      dst - (u8 *)vb2_plane_vaddr(&vb->vb.vb2_buf, 0));

	vb->vb.vb2_buf.timestamp = frame->timestamp;
	v4l2_buf->field = V4L2_FIELD_INTERLACED;
	v4l2_buf->sequence = frame->seqno;

	/* Check for motion flags */
	if (frame->gop_seqno /* P-frame */ &&
	    tw5864_is_motion_triggered(frame)) {
		struct v4l2_event ev = {
			.type = V4L2_EVENT_MOTION_DET,
			.u.motion_det = {
				.flags = V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ,
				.frame_sequence = v4l2_buf->sequence,
			},
		};

		v4l2_event_queue(&input->vdev, &ev);
	}

	vb2_buffer_done(&vb->vb.vb2_buf, VB2_BUF_STATE_DONE);
}

static v4l2_std_id tw5864_get_v4l2_std(enum tw5864_vid_std std)
{
	switch (std) {
	case STD_NTSC:    return V4L2_STD_NTSC_M;
	case STD_PAL:     return V4L2_STD_PAL_B;
	case STD_SECAM:   return V4L2_STD_SECAM_B;
	case STD_NTSC443: return V4L2_STD_NTSC_443;
	case STD_PAL_M:   return V4L2_STD_PAL_M;
	case STD_PAL_CN:  return V4L2_STD_PAL_Nc;
	case STD_PAL_60:  return V4L2_STD_PAL_60;
	case STD_INVALID: return V4L2_STD_UNKNOWN;
	}
	return 0;
}

static enum tw5864_vid_std tw5864_from_v4l2_std(v4l2_std_id v4l2_std)
{
	if (v4l2_std & V4L2_STD_NTSC_M)
		return STD_NTSC;
	if (v4l2_std & V4L2_STD_PAL_B)
		return STD_PAL;
	if (v4l2_std & V4L2_STD_SECAM_B)
		return STD_SECAM;
	if (v4l2_std & V4L2_STD_NTSC_443)
		return STD_NTSC443;
	if (v4l2_std & V4L2_STD_PAL_M)
		return STD_PAL_M;
	if (v4l2_std & V4L2_STD_PAL_Nc)
		return STD_PAL_CN;
	if (v4l2_std & V4L2_STD_PAL_60)
		return STD_PAL_60;

	return STD_INVALID;
}

static void tw5864_encoder_tables_upload(struct tw5864_dev *dev)
{
	int i;

	tw_writel(TW5864_VLC_RD, 0x1);
	for (i = 0; i < VLC_LOOKUP_TABLE_LEN; i++) {
		tw_writel((TW5864_VLC_STREAM_MEM_START + i * 4),
			  encoder_vlc_lookup_table[i]);
	}
	tw_writel(TW5864_VLC_RD, 0x0);

	for (i = 0; i < QUANTIZATION_TABLE_LEN; i++) {
		tw_writel((TW5864_QUAN_TAB + i * 4),
			  forward_quantization_table[i]);
	}

	for (i = 0; i < QUANTIZATION_TABLE_LEN; i++) {
		tw_writel((TW5864_QUAN_TAB + i * 4),
			  inverse_quantization_table[i]);
	}
}