/*
 *  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);

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

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

        /*
         * 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]);
        }
}