drivers/media/pci/tw68/tw68-video.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  tw68 functions to handle video data
   4  *
   5  *  Much of this code is derived from the cx88 and sa7134 drivers, which
   6  *  were in turn derived from the bt87x driver.  The original work was by
   7  *  Gerd Knorr; more recently the code was enhanced by Mauro Carvalho Chehab,
   8  *  Hans Verkuil, Andy Walls and many others.  Their work is gratefully
   9  *  acknowledged.  Full credit goes to them - any problems within this code
  10  *  are mine.
  11  *
  12  *  Copyright (C) 2009  William M. Brack
  13  *
  14  *  Refactored and updated to the latest v4l core frameworks:
  15  *
  16  *  Copyright (C) 2014 Hans Verkuil <hverkuil@xs4all.nl>
  17  */
  18
  19 #include <linux/module.h>
  20 #include <media/v4l2-common.h>
  21 #include <media/v4l2-event.h>
  22 #include <media/videobuf2-dma-sg.h>
  23
  24 #include "tw68.h"
  25 #include "tw68-reg.h"
  26
  27 /* ------------------------------------------------------------------ */
  28 /* data structs for video                                             */
  29 /*
  30  * FIXME -
  31  * Note that the saa7134 has formats, e.g. YUV420, which are classified
  32  * as "planar".  These affect overlay mode, and are flagged with a field
  33  * ".planar" in the format.  Do we need to implement this in this driver?
  34  */
  35 static const struct tw68_format formats[] = {
  36         {
  37                 .fourcc         = V4L2_PIX_FMT_RGB555,
  38                 .depth          = 16,
  39                 .twformat       = ColorFormatRGB15,
  40         }, {
  41                 .fourcc         = V4L2_PIX_FMT_RGB555X,
  42                 .depth          = 16,
  43                 .twformat       = ColorFormatRGB15 | ColorFormatBSWAP,
  44         }, {
  45                 .fourcc         = V4L2_PIX_FMT_RGB565,
  46                 .depth          = 16,
  47                 .twformat       = ColorFormatRGB16,
  48         }, {
  49                 .fourcc         = V4L2_PIX_FMT_RGB565X,
  50                 .depth          = 16,
  51                 .twformat       = ColorFormatRGB16 | ColorFormatBSWAP,
  52         }, {
  53                 .fourcc         = V4L2_PIX_FMT_BGR24,
  54                 .depth          = 24,
  55                 .twformat       = ColorFormatRGB24,
  56         }, {
  57                 .fourcc         = V4L2_PIX_FMT_RGB24,
  58                 .depth          = 24,
  59                 .twformat       = ColorFormatRGB24 | ColorFormatBSWAP,
  60         }, {
  61                 .fourcc         = V4L2_PIX_FMT_BGR32,
  62                 .depth          = 32,
  63                 .twformat       = ColorFormatRGB32,
  64         }, {
  65                 .fourcc         = V4L2_PIX_FMT_RGB32,
  66                 .depth          = 32,
  67                 .twformat       = ColorFormatRGB32 | ColorFormatBSWAP |
  68                                   ColorFormatWSWAP,
  69         }, {
  70                 .fourcc         = V4L2_PIX_FMT_YUYV,
  71                 .depth          = 16,
  72                 .twformat       = ColorFormatYUY2,
  73         }, {
  74                 .fourcc         = V4L2_PIX_FMT_UYVY,
  75                 .depth          = 16,
  76                 .twformat       = ColorFormatYUY2 | ColorFormatBSWAP,
  77         }
  78 };
  79 #define FORMATS ARRAY_SIZE(formats)
  80
  81 #define NORM_625_50                     \
  82                 .h_delay        = 3,    \
  83                 .h_delay0       = 133,  \
  84                 .h_start        = 0,    \
  85                 .h_stop         = 719,  \
  86                 .v_delay        = 24,   \
  87                 .vbi_v_start_0  = 7,    \
  88                 .vbi_v_stop_0   = 22,   \
  89                 .video_v_start  = 24,   \
  90                 .video_v_stop   = 311,  \
  91                 .vbi_v_start_1  = 319
  92
  93 #define NORM_525_60                     \
  94                 .h_delay        = 8,    \
  95                 .h_delay0       = 138,  \
  96                 .h_start        = 0,    \
  97                 .h_stop         = 719,  \
  98                 .v_delay        = 22,   \
  99                 .vbi_v_start_0  = 10,   \
 100                 .vbi_v_stop_0   = 21,   \
 101                 .video_v_start  = 22,   \
 102                 .video_v_stop   = 262,  \
 103                 .vbi_v_start_1  = 273
 104
 105 /*
 106  * The following table is searched by tw68_s_std, first for a specific
 107  * match, then for an entry which contains the desired id.  The table
 108  * entries should therefore be ordered in ascending order of specificity.
 109  */
 110 static const struct tw68_tvnorm tvnorms[] = {
 111         {
 112                 .name           = "PAL", /* autodetect */
 113                 .id             = V4L2_STD_PAL,
 114                 NORM_625_50,
 115
 116                 .sync_control   = 0x18,
 117                 .luma_control   = 0x40,
 118                 .chroma_ctrl1   = 0x81,
 119                 .chroma_gain    = 0x2a,
 120                 .chroma_ctrl2   = 0x06,
 121                 .vgate_misc     = 0x1c,
 122                 .format         = VideoFormatPALBDGHI,
 123         }, {
 124                 .name           = "NTSC",
 125                 .id             = V4L2_STD_NTSC,
 126                 NORM_525_60,
 127
 128                 .sync_control   = 0x59,
 129                 .luma_control   = 0x40,
 130                 .chroma_ctrl1   = 0x89,
 131                 .chroma_gain    = 0x2a,
 132                 .chroma_ctrl2   = 0x0e,
 133                 .vgate_misc     = 0x18,
 134                 .format         = VideoFormatNTSC,
 135         }, {
 136                 .name           = "SECAM",
 137                 .id             = V4L2_STD_SECAM,
 138                 NORM_625_50,
 139
 140                 .sync_control   = 0x18,
 141                 .luma_control   = 0x1b,
 142                 .chroma_ctrl1   = 0xd1,
 143                 .chroma_gain    = 0x80,
 144                 .chroma_ctrl2   = 0x00,
 145                 .vgate_misc     = 0x1c,
 146                 .format         = VideoFormatSECAM,
 147         }, {
 148                 .name           = "PAL-M",
 149                 .id             = V4L2_STD_PAL_M,
 150                 NORM_525_60,
 151
 152                 .sync_control   = 0x59,
 153                 .luma_control   = 0x40,
 154                 .chroma_ctrl1   = 0xb9,
 155                 .chroma_gain    = 0x2a,
 156                 .chroma_ctrl2   = 0x0e,
 157                 .vgate_misc     = 0x18,
 158                 .format         = VideoFormatPALM,
 159         }, {
 160                 .name           = "PAL-Nc",
 161                 .id             = V4L2_STD_PAL_Nc,
 162                 NORM_625_50,
 163
 164                 .sync_control   = 0x18,
 165                 .luma_control   = 0x40,
 166                 .chroma_ctrl1   = 0xa1,
 167                 .chroma_gain    = 0x2a,
 168                 .chroma_ctrl2   = 0x06,
 169                 .vgate_misc     = 0x1c,
 170                 .format         = VideoFormatPALNC,
 171         }, {
 172                 .name           = "PAL-60",
 173                 .id             = V4L2_STD_PAL_60,
 174                 .h_delay        = 186,
 175                 .h_start        = 0,
 176                 .h_stop         = 719,
 177                 .v_delay        = 26,
 178                 .video_v_start  = 23,
 179                 .video_v_stop   = 262,
 180                 .vbi_v_start_0  = 10,
 181                 .vbi_v_stop_0   = 21,
 182                 .vbi_v_start_1  = 273,
 183
 184                 .sync_control   = 0x18,
 185                 .luma_control   = 0x40,
 186                 .chroma_ctrl1   = 0x81,
 187                 .chroma_gain    = 0x2a,
 188                 .chroma_ctrl2   = 0x06,
 189                 .vgate_misc     = 0x1c,
 190                 .format         = VideoFormatPAL60,
 191         }
 192 };
 193 #define TVNORMS ARRAY_SIZE(tvnorms)
 194
 195 static const struct tw68_format *format_by_fourcc(unsigned int fourcc)
 196 {
 197         unsigned int i;
 198
 199         for (i = 0; i < FORMATS; i++)
 200                 if (formats[i].fourcc == fourcc)
 201                         return formats+i;
 202         return NULL;
 203 }
 204
 205
 206 /* ------------------------------------------------------------------ */
 207 /*
 208  * Note that the cropping rectangles are described in terms of a single
 209  * frame, i.e. line positions are only 1/2 the interlaced equivalent
 210  */
 211 static void set_tvnorm(struct tw68_dev *dev, const struct tw68_tvnorm *norm)
 212 {
 213         if (norm != dev->tvnorm) {
 214                 dev->width = 720;
 215                 dev->height = (norm->id & V4L2_STD_525_60) ? 480 : 576;
 216                 dev->tvnorm = norm;
 217                 tw68_set_tvnorm_hw(dev);
 218         }
 219 }
 220
 221 /*
 222  * tw68_set_scale
 223  *
 224  * Scaling and Cropping for video decoding
 225  *
 226  * We are working with 3 values for horizontal and vertical - scale,
 227  * delay and active.
 228  *
 229  * HACTIVE represent the actual number of pixels in the "usable" image,
 230  * before scaling.  HDELAY represents the number of pixels skipped
 231  * between the start of the horizontal sync and the start of the image.
 232  * HSCALE is calculated using the formula
 233  *      HSCALE = (HACTIVE / (#pixels desired)) * 256
 234  *
 235  * The vertical registers are similar, except based upon the total number
 236  * of lines in the image, and the first line of the image (i.e. ignoring
 237  * vertical sync and VBI).
 238  *
 239  * Note that the number of bytes reaching the FIFO (and hence needing
 240  * to be processed by the DMAP program) is completely dependent upon
 241  * these values, especially HSCALE.
 242  *
 243  * Parameters:
 244  *      @dev            pointer to the device structure, needed for
 245  *                      getting current norm (as well as debug print)
 246  *      @width          actual image width (from user buffer)
 247  *      @height         actual image height
 248  *      @field          indicates Top, Bottom or Interlaced
 249  */
 250 static int tw68_set_scale(struct tw68_dev *dev, unsigned int width,
 251                           unsigned int height, enum v4l2_field field)
 252 {
 253         const struct tw68_tvnorm *norm = dev->tvnorm;
 254         /* set individually for debugging clarity */
 255         int hactive, hdelay, hscale;
 256         int vactive, vdelay, vscale;
 257         int comb;
 258
 259         if (V4L2_FIELD_HAS_BOTH(field)) /* if field is interlaced */
 260                 height /= 2;            /* we must set for 1-frame */
 261
 262         pr_debug("%s: width=%d, height=%d, both=%d\n"
 263                  "  tvnorm h_delay=%d, h_start=%d, h_stop=%d, v_delay=%d, v_start=%d, v_stop=%d\n",
 264                 __func__, width, height, V4L2_FIELD_HAS_BOTH(field),
 265                 norm->h_delay, norm->h_start, norm->h_stop,
 266                 norm->v_delay, norm->video_v_start,
 267                 norm->video_v_stop);
 268
 269         switch (dev->vdecoder) {
 270         case TW6800:
 271                 hdelay = norm->h_delay0;
 272                 break;
 273         default:
 274                 hdelay = norm->h_delay;
 275                 break;
 276         }
 277
 278         hdelay += norm->h_start;
 279         hactive = norm->h_stop - norm->h_start + 1;
 280
 281         hscale = (hactive * 256) / (width);
 282
 283         vdelay = norm->v_delay;
 284         vactive = ((norm->id & V4L2_STD_525_60) ? 524 : 624) / 2 - norm->video_v_start;
 285         vscale = (vactive * 256) / height;
 286
 287         pr_debug("%s: %dx%d [%s%s,%s]\n", __func__,
 288                 width, height,
 289                 V4L2_FIELD_HAS_TOP(field)    ? "T" : "",
 290                 V4L2_FIELD_HAS_BOTTOM(field) ? "B" : "",
 291                 v4l2_norm_to_name(dev->tvnorm->id));
 292         pr_debug("%s: hactive=%d, hdelay=%d, hscale=%d; vactive=%d, vdelay=%d, vscale=%d\n",
 293                  __func__,
 294                 hactive, hdelay, hscale, vactive, vdelay, vscale);
 295
 296         comb =  ((vdelay & 0x300)  >> 2) |
 297                 ((vactive & 0x300) >> 4) |
 298                 ((hdelay & 0x300)  >> 6) |
 299                 ((hactive & 0x300) >> 8);
 300         pr_debug("%s: setting CROP_HI=%02x, VDELAY_LO=%02x, VACTIVE_LO=%02x, HDELAY_LO=%02x, HACTIVE_LO=%02x\n",
 301                 __func__, comb, vdelay, vactive, hdelay, hactive);
 302         tw_writeb(TW68_CROP_HI, comb);
 303         tw_writeb(TW68_VDELAY_LO, vdelay & 0xff);
 304         tw_writeb(TW68_VACTIVE_LO, vactive & 0xff);
 305         tw_writeb(TW68_HDELAY_LO, hdelay & 0xff);
 306         tw_writeb(TW68_HACTIVE_LO, hactive & 0xff);
 307
 308         comb = ((vscale & 0xf00) >> 4) | ((hscale & 0xf00) >> 8);
 309         pr_debug("%s: setting SCALE_HI=%02x, VSCALE_LO=%02x, HSCALE_LO=%02x\n",
 310                  __func__, comb, vscale, hscale);
 311         tw_writeb(TW68_SCALE_HI, comb);
 312         tw_writeb(TW68_VSCALE_LO, vscale);
 313         tw_writeb(TW68_HSCALE_LO, hscale);
 314
 315         return 0;
 316 }
 317
 318 /* ------------------------------------------------------------------ */
 319
 320 int tw68_video_start_dma(struct tw68_dev *dev, struct tw68_buf *buf)
 321 {
 322         /* Set cropping and scaling */
 323         tw68_set_scale(dev, dev->width, dev->height, dev->field);
 324         /*
 325          *  Set start address for RISC program.  Note that if the DMAP
 326          *  processor is currently running, it must be stopped before
 327          *  a new address can be set.
 328          */
 329         tw_clearl(TW68_DMAC, TW68_DMAP_EN);
 330         tw_writel(TW68_DMAP_SA, buf->dma);
 331         /* Clear any pending interrupts */
 332         tw_writel(TW68_INTSTAT, dev->board_virqmask);
 333         /* Enable the risc engine and the fifo */
 334         tw_andorl(TW68_DMAC, 0xff, dev->fmt->twformat |
 335                 ColorFormatGamma | TW68_DMAP_EN | TW68_FIFO_EN);
 336         dev->pci_irqmask |= dev->board_virqmask;
 337         tw_setl(TW68_INTMASK, dev->pci_irqmask);
 338         return 0;
 339 }
 340
 341 /* ------------------------------------------------------------------ */
 342
 343 /* calc max # of buffers from size (must not exceed the 4MB virtual
 344  * address space per DMA channel) */
 345 static int tw68_buffer_count(unsigned int size, unsigned int count)
 346 {
 347         unsigned int maxcount;
 348
 349         maxcount = (4 * 1024 * 1024) / roundup(size, PAGE_SIZE);
 350         if (count > maxcount)
 351                 count = maxcount;
 352         return count;
 353 }
 354
 355 /* ------------------------------------------------------------- */
 356 /* vb2 queue operations                                          */
 357
 358 static int tw68_queue_setup(struct vb2_queue *q,
 359                            unsigned int *num_buffers, unsigned int *num_planes,
 360                            unsigned int sizes[], struct device *alloc_devs[])
 361 {
 362         struct tw68_dev *dev = vb2_get_drv_priv(q);
 363         unsigned tot_bufs = q->num_buffers + *num_buffers;
 364         unsigned size = (dev->fmt->depth * dev->width * dev->height) >> 3;
 365
 366         if (tot_bufs < 2)
 367                 tot_bufs = 2;
 368         tot_bufs = tw68_buffer_count(size, tot_bufs);
 369         *num_buffers = tot_bufs - q->num_buffers;
 370         /*
 371          * We allow create_bufs, but only if the sizeimage is >= as the
 372          * current sizeimage. The tw68_buffer_count calculation becomes quite
 373          * difficult otherwise.
 374          */
 375         if (*num_planes)
 376                 return sizes[0] < size ? -EINVAL : 0;
 377         *num_planes = 1;
 378         sizes[0] = size;
 379
 380         return 0;
 381 }
 382
 383 /*
 384  * The risc program for each buffers works as follows: it starts with a simple
 385  * 'JUMP to addr + 8', which is effectively a NOP. Then the program to DMA the
 386  * buffer follows and at the end we have a JUMP back to the start + 8 (skipping
 387  * the initial JUMP).
 388  *
 389  * This is the program of the first buffer to be queued if the active list is
 390  * empty and it just keeps DMAing this buffer without generating any interrupts.
 391  *
 392  * If a new buffer is added then the initial JUMP in the program generates an
 393  * interrupt as well which signals that the previous buffer has been DMAed
 394  * successfully and that it can be returned to userspace.
 395  *
 396  * It also sets the final jump of the previous buffer to the start of the new
 397  * buffer, thus chaining the new buffer into the DMA chain. This is a single
 398  * atomic u32 write, so there is no race condition.
 399  *
 400  * The end-result of all this that you only get an interrupt when a buffer
 401  * is ready, so the control flow is very easy.
 402  */
 403 static void tw68_buf_queue(struct vb2_buffer *vb)
 404 {
 405         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 406         struct vb2_queue *vq = vb->vb2_queue;
 407         struct tw68_dev *dev = vb2_get_drv_priv(vq);
 408         struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
 409         struct tw68_buf *prev;
 410         unsigned long flags;
 411
 412         spin_lock_irqsave(&dev->slock, flags);
 413
 414         /* append a 'JUMP to start of buffer' to the buffer risc program */
 415         buf->jmp[0] = cpu_to_le32(RISC_JUMP);
 416         buf->jmp[1] = cpu_to_le32(buf->dma + 8);
 417
 418         if (!list_empty(&dev->active)) {
 419                 prev = list_entry(dev->active.prev, struct tw68_buf, list);
 420                 buf->cpu[0] |= cpu_to_le32(RISC_INT_BIT);
 421                 prev->jmp[1] = cpu_to_le32(buf->dma);
 422         }
 423         list_add_tail(&buf->list, &dev->active);
 424         spin_unlock_irqrestore(&dev->slock, flags);
 425 }
 426
 427 /*
 428  * buffer_prepare
 429  *
 430  * Set the ancillary information into the buffer structure.  This
 431  * includes generating the necessary risc program if it hasn't already
 432  * been done for the current buffer format.
 433  * The structure fh contains the details of the format requested by the
 434  * user - type, width, height and #fields.  This is compared with the
 435  * last format set for the current buffer.  If they differ, the risc
 436  * code (which controls the filling of the buffer) is (re-)generated.
 437  */
 438 static int tw68_buf_prepare(struct vb2_buffer *vb)
 439 {
 440         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 441         struct vb2_queue *vq = vb->vb2_queue;
 442         struct tw68_dev *dev = vb2_get_drv_priv(vq);
 443         struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
 444         struct sg_table *dma = vb2_dma_sg_plane_desc(vb, 0);
 445         unsigned size, bpl;
 446
 447         size = (dev->width * dev->height * dev->fmt->depth) >> 3;
 448         if (vb2_plane_size(vb, 0) < size)
 449                 return -EINVAL;
 450         vb2_set_plane_payload(vb, 0, size);
 451
 452         bpl = (dev->width * dev->fmt->depth) >> 3;
 453         switch (dev->field) {
 454         case V4L2_FIELD_TOP:
 455                 tw68_risc_buffer(dev->pci, buf, dma->sgl,
 456                                  0, UNSET, bpl, 0, dev->height);
 457                 break;
 458         case V4L2_FIELD_BOTTOM:
 459                 tw68_risc_buffer(dev->pci, buf, dma->sgl,
 460                                  UNSET, 0, bpl, 0, dev->height);
 461                 break;
 462         case V4L2_FIELD_SEQ_TB:
 463                 tw68_risc_buffer(dev->pci, buf, dma->sgl,
 464                                  0, bpl * (dev->height >> 1),
 465                                  bpl, 0, dev->height >> 1);
 466                 break;
 467         case V4L2_FIELD_SEQ_BT:
 468                 tw68_risc_buffer(dev->pci, buf, dma->sgl,
 469                                  bpl * (dev->height >> 1), 0,
 470                                  bpl, 0, dev->height >> 1);
 471                 break;
 472         case V4L2_FIELD_INTERLACED:
 473         default:
 474                 tw68_risc_buffer(dev->pci, buf, dma->sgl,
 475                                  0, bpl, bpl, bpl, dev->height >> 1);
 476                 break;
 477         }
 478         return 0;
 479 }
 480
 481 static void tw68_buf_finish(struct vb2_buffer *vb)
 482 {
 483         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 484         struct vb2_queue *vq = vb->vb2_queue;
 485         struct tw68_dev *dev = vb2_get_drv_priv(vq);
 486         struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
 487
 488         dma_free_coherent(&dev->pci->dev, buf->size, buf->cpu, buf->dma);
 489 }
 490
 491 static int tw68_start_streaming(struct vb2_queue *q, unsigned int count)
 492 {
 493         struct tw68_dev *dev = vb2_get_drv_priv(q);
 494         struct tw68_buf *buf =
 495                 container_of(dev->active.next, struct tw68_buf, list);
 496
 497         dev->seqnr = 0;
 498         tw68_video_start_dma(dev, buf);
 499         return 0;
 500 }
 501
 502 static void tw68_stop_streaming(struct vb2_queue *q)
 503 {
 504         struct tw68_dev *dev = vb2_get_drv_priv(q);
 505
 506         /* Stop risc & fifo */
 507         tw_clearl(TW68_DMAC, TW68_DMAP_EN | TW68_FIFO_EN);
 508         while (!list_empty(&dev->active)) {
 509                 struct tw68_buf *buf =
 510                         container_of(dev->active.next, struct tw68_buf, list);
 511
 512                 list_del(&buf->list);
 513                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 514         }
 515 }
 516
 517 static const struct vb2_ops tw68_video_qops = {
 518         .queue_setup    = tw68_queue_setup,
 519         .buf_queue      = tw68_buf_queue,
 520         .buf_prepare    = tw68_buf_prepare,
 521         .buf_finish     = tw68_buf_finish,
 522         .start_streaming = tw68_start_streaming,
 523         .stop_streaming = tw68_stop_streaming,
 524         .wait_prepare   = vb2_ops_wait_prepare,
 525         .wait_finish    = vb2_ops_wait_finish,
 526 };
 527
 528 /* ------------------------------------------------------------------ */
 529
 530 static int tw68_s_ctrl(struct v4l2_ctrl *ctrl)
 531 {
 532         struct tw68_dev *dev =
 533                 container_of(ctrl->handler, struct tw68_dev, hdl);
 534
 535         switch (ctrl->id) {
 536         case V4L2_CID_BRIGHTNESS:
 537                 tw_writeb(TW68_BRIGHT, ctrl->val);
 538                 break;
 539         case V4L2_CID_HUE:
 540                 tw_writeb(TW68_HUE, ctrl->val);
 541                 break;
 542         case V4L2_CID_CONTRAST:
 543                 tw_writeb(TW68_CONTRAST, ctrl->val);
 544                 break;
 545         case V4L2_CID_SATURATION:
 546                 tw_writeb(TW68_SAT_U, ctrl->val);
 547                 tw_writeb(TW68_SAT_V, ctrl->val);
 548                 break;
 549         case V4L2_CID_COLOR_KILLER:
 550                 if (ctrl->val)
 551                         tw_andorb(TW68_MISC2, 0xe0, 0xe0);
 552                 else
 553                         tw_andorb(TW68_MISC2, 0xe0, 0x00);
 554                 break;
 555         case V4L2_CID_CHROMA_AGC:
 556                 if (ctrl->val)
 557                         tw_andorb(TW68_LOOP, 0x30, 0x20);
 558                 else
 559                         tw_andorb(TW68_LOOP, 0x30, 0x00);
 560                 break;
 561         }
 562         return 0;
 563 }
 564
 565 /* ------------------------------------------------------------------ */
 566
 567 /*
 568  * Note that this routine returns what is stored in the fh structure, and
 569  * does not interrogate any of the device registers.
 570  */
 571 static int tw68_g_fmt_vid_cap(struct file *file, void *priv,
 572                                 struct v4l2_format *f)
 573 {
 574         struct tw68_dev *dev = video_drvdata(file);
 575
 576         f->fmt.pix.width        = dev->width;
 577         f->fmt.pix.height       = dev->height;
 578         f->fmt.pix.field        = dev->field;
 579         f->fmt.pix.pixelformat  = dev->fmt->fourcc;
 580         f->fmt.pix.bytesperline =
 581                 (f->fmt.pix.width * (dev->fmt->depth)) >> 3;
 582         f->fmt.pix.sizeimage =
 583                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 584         f->fmt.pix.colorspace   = V4L2_COLORSPACE_SMPTE170M;
 585         return 0;
 586 }
 587
 588 static int tw68_try_fmt_vid_cap(struct file *file, void *priv,
 589                                                 struct v4l2_format *f)
 590 {
 591         struct tw68_dev *dev = video_drvdata(file);
 592         const struct tw68_format *fmt;
 593         enum v4l2_field field;
 594         unsigned int maxh;
 595
 596         fmt = format_by_fourcc(f->fmt.pix.pixelformat);
 597         if (NULL == fmt)
 598                 return -EINVAL;
 599
 600         field = f->fmt.pix.field;
 601         maxh  = (dev->tvnorm->id & V4L2_STD_525_60) ? 480 : 576;
 602
 603         switch (field) {
 604         case V4L2_FIELD_TOP:
 605         case V4L2_FIELD_BOTTOM:
 606                 break;
 607         case V4L2_FIELD_INTERLACED:
 608         case V4L2_FIELD_SEQ_BT:
 609         case V4L2_FIELD_SEQ_TB:
 610                 maxh = maxh * 2;
 611                 break;
 612         default:
 613                 field = (f->fmt.pix.height > maxh / 2)
 614                         ? V4L2_FIELD_INTERLACED
 615                         : V4L2_FIELD_BOTTOM;
 616                 break;
 617         }
 618
 619         f->fmt.pix.field = field;
 620         if (f->fmt.pix.width  < 48)
 621                 f->fmt.pix.width  = 48;
 622         if (f->fmt.pix.height < 32)
 623                 f->fmt.pix.height = 32;
 624         if (f->fmt.pix.width > 720)
 625                 f->fmt.pix.width = 720;
 626         if (f->fmt.pix.height > maxh)
 627                 f->fmt.pix.height = maxh;
 628         f->fmt.pix.width &= ~0x03;
 629         f->fmt.pix.bytesperline =
 630                 (f->fmt.pix.width * (fmt->depth)) >> 3;
 631         f->fmt.pix.sizeimage =
 632                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 633         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 634         return 0;
 635 }
 636
 637 /*
 638  * Note that tw68_s_fmt_vid_cap sets the information into the fh structure,
 639  * and it will be used for all future new buffers.  However, there could be
 640  * some number of buffers on the "active" chain which will be filled before
 641  * the change takes place.
 642  */
 643 static int tw68_s_fmt_vid_cap(struct file *file, void *priv,
 644                                         struct v4l2_format *f)
 645 {
 646         struct tw68_dev *dev = video_drvdata(file);
 647         int err;
 648
 649         err = tw68_try_fmt_vid_cap(file, priv, f);
 650         if (0 != err)
 651                 return err;
 652
 653         dev->fmt = format_by_fourcc(f->fmt.pix.pixelformat);
 654         dev->width = f->fmt.pix.width;
 655         dev->height = f->fmt.pix.height;
 656         dev->field = f->fmt.pix.field;
 657         return 0;
 658 }
 659
 660 static int tw68_enum_input(struct file *file, void *priv,
 661                                         struct v4l2_input *i)
 662 {
 663         struct tw68_dev *dev = video_drvdata(file);
 664         unsigned int n;
 665
 666         n = i->index;
 667         if (n >= TW68_INPUT_MAX)
 668                 return -EINVAL;
 669         i->index = n;
 670         i->type = V4L2_INPUT_TYPE_CAMERA;
 671         snprintf(i->name, sizeof(i->name), "Composite %d", n);
 672
 673         /* If the query is for the current input, get live data */
 674         if (n == dev->input) {
 675                 int v1 = tw_readb(TW68_STATUS1);
 676                 int v2 = tw_readb(TW68_MVSN);
 677
 678                 if (0 != (v1 & (1 << 7)))
 679                         i->status |= V4L2_IN_ST_NO_SYNC;
 680                 if (0 != (v1 & (1 << 6)))
 681                         i->status |= V4L2_IN_ST_NO_H_LOCK;
 682                 if (0 != (v1 & (1 << 2)))
 683                         i->status |= V4L2_IN_ST_NO_SIGNAL;
 684                 if (0 != (v1 & 1 << 1))
 685                         i->status |= V4L2_IN_ST_NO_COLOR;
 686                 if (0 != (v2 & (1 << 2)))
 687                         i->status |= V4L2_IN_ST_MACROVISION;
 688         }
 689         i->std = video_devdata(file)->tvnorms;
 690         return 0;
 691 }
 692
 693 static int tw68_g_input(struct file *file, void *priv, unsigned int *i)
 694 {
 695         struct tw68_dev *dev = video_drvdata(file);
 696
 697         *i = dev->input;
 698         return 0;
 699 }
 700
 701 static int tw68_s_input(struct file *file, void *priv, unsigned int i)
 702 {
 703         struct tw68_dev *dev = video_drvdata(file);
 704
 705         if (i >= TW68_INPUT_MAX)
 706                 return -EINVAL;
 707         dev->input = i;
 708         tw_andorb(TW68_INFORM, 0x03 << 2, dev->input << 2);
 709         return 0;
 710 }
 711
 712 static int tw68_querycap(struct file *file, void  *priv,
 713                                         struct v4l2_capability *cap)
 714 {
 715         strscpy(cap->driver, "tw68", sizeof(cap->driver));
 716         strscpy(cap->card, "Techwell Capture Card",
 717                 sizeof(cap->card));
 718         return 0;
 719 }
 720
 721 static int tw68_s_std(struct file *file, void *priv, v4l2_std_id id)
 722 {
 723         struct tw68_dev *dev = video_drvdata(file);
 724         unsigned int i;
 725
 726         if (vb2_is_busy(&dev->vidq))
 727                 return -EBUSY;
 728
 729         /* Look for match on complete norm id (may have mult bits) */
 730         for (i = 0; i < TVNORMS; i++) {
 731                 if (id == tvnorms[i].id)
 732                         break;
 733         }
 734
 735         /* If no exact match, look for norm which contains this one */
 736         if (i == TVNORMS) {
 737                 for (i = 0; i < TVNORMS; i++)
 738                         if (id & tvnorms[i].id)
 739                                 break;
 740         }
 741         /* If still not matched, give up */
 742         if (i == TVNORMS)
 743                 return -EINVAL;
 744
 745         set_tvnorm(dev, &tvnorms[i]);   /* do the actual setting */
 746         return 0;
 747 }
 748
 749 static int tw68_g_std(struct file *file, void *priv, v4l2_std_id *id)
 750 {
 751         struct tw68_dev *dev = video_drvdata(file);
 752
 753         *id = dev->tvnorm->id;
 754         return 0;
 755 }
 756
 757 static int tw68_enum_fmt_vid_cap(struct file *file, void  *priv,
 758                                         struct v4l2_fmtdesc *f)
 759 {
 760         if (f->index >= FORMATS)
 761                 return -EINVAL;
 762
 763         f->pixelformat = formats[f->index].fourcc;
 764
 765         return 0;
 766 }
 767
 768 /*
 769  * Used strictly for internal development and debugging, this routine
 770  * prints out the current register contents for the tw68xx device.
 771  */
 772 static void tw68_dump_regs(struct tw68_dev *dev)
 773 {
 774         unsigned char line[80];
 775         int i, j, k;
 776         unsigned char *cptr;
 777
 778         pr_info("Full dump of TW68 registers:\n");
 779         /* First we do the PCI regs, 8 4-byte regs per line */
 780         for (i = 0; i < 0x100; i += 32) {
 781                 cptr = line;
 782                 cptr += sprintf(cptr, "%03x  ", i);
 783                 /* j steps through the next 4 words */
 784                 for (j = i; j < i + 16; j += 4)
 785                         cptr += sprintf(cptr, "%08x ", tw_readl(j));
 786                 *cptr++ = ' ';
 787                 for (; j < i + 32; j += 4)
 788                         cptr += sprintf(cptr, "%08x ", tw_readl(j));
 789                 *cptr++ = '\n';
 790                 *cptr = 0;
 791                 pr_info("%s", line);
 792         }
 793         /* Next the control regs, which are single-byte, address mod 4 */
 794         while (i < 0x400) {
 795                 cptr = line;
 796                 cptr += sprintf(cptr, "%03x ", i);
 797                 /* Print out 4 groups of 4 bytes */
 798                 for (j = 0; j < 4; j++) {
 799                         for (k = 0; k < 4; k++) {
 800                                 cptr += sprintf(cptr, "%02x ",
 801                                         tw_readb(i));
 802                                 i += 4;
 803                         }
 804                         *cptr++ = ' ';
 805                 }
 806                 *cptr++ = '\n';
 807                 *cptr = 0;
 808                 pr_info("%s", line);
 809         }
 810 }
 811
 812 static int vidioc_log_status(struct file *file, void *priv)
 813 {
 814         struct tw68_dev *dev = video_drvdata(file);
 815
 816         tw68_dump_regs(dev);
 817         return v4l2_ctrl_log_status(file, priv);
 818 }
 819
 820 #ifdef CONFIG_VIDEO_ADV_DEBUG
 821 static int vidioc_g_register(struct file *file, void *priv,
 822                               struct v4l2_dbg_register *reg)
 823 {
 824         struct tw68_dev *dev = video_drvdata(file);
 825
 826         if (reg->size == 1)
 827                 reg->val = tw_readb(reg->reg);
 828         else
 829                 reg->val = tw_readl(reg->reg);
 830         return 0;
 831 }
 832
 833 static int vidioc_s_register(struct file *file, void *priv,
 834                                 const struct v4l2_dbg_register *reg)
 835 {
 836         struct tw68_dev *dev = video_drvdata(file);
 837
 838         if (reg->size == 1)
 839                 tw_writeb(reg->reg, reg->val);
 840         else
 841                 tw_writel(reg->reg & 0xffff, reg->val);
 842         return 0;
 843 }
 844 #endif
 845
 846 static const struct v4l2_ctrl_ops tw68_ctrl_ops = {
 847         .s_ctrl = tw68_s_ctrl,
 848 };
 849
 850 static const struct v4l2_file_operations video_fops = {
 851         .owner                  = THIS_MODULE,
 852         .open                   = v4l2_fh_open,
 853         .release                = vb2_fop_release,
 854         .read                   = vb2_fop_read,
 855         .poll                   = vb2_fop_poll,
 856         .mmap                   = vb2_fop_mmap,
 857         .unlocked_ioctl         = video_ioctl2,
 858 };
 859
 860 static const struct v4l2_ioctl_ops video_ioctl_ops = {
 861         .vidioc_querycap                = tw68_querycap,
 862         .vidioc_enum_fmt_vid_cap        = tw68_enum_fmt_vid_cap,
 863         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
 864         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
 865         .vidioc_querybuf                = vb2_ioctl_querybuf,
 866         .vidioc_qbuf                    = vb2_ioctl_qbuf,
 867         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
 868         .vidioc_s_std                   = tw68_s_std,
 869         .vidioc_g_std                   = tw68_g_std,
 870         .vidioc_enum_input              = tw68_enum_input,
 871         .vidioc_g_input                 = tw68_g_input,
 872         .vidioc_s_input                 = tw68_s_input,
 873         .vidioc_streamon                = vb2_ioctl_streamon,
 874         .vidioc_streamoff               = vb2_ioctl_streamoff,
 875         .vidioc_g_fmt_vid_cap           = tw68_g_fmt_vid_cap,
 876         .vidioc_try_fmt_vid_cap         = tw68_try_fmt_vid_cap,
 877         .vidioc_s_fmt_vid_cap           = tw68_s_fmt_vid_cap,
 878         .vidioc_log_status              = vidioc_log_status,
 879         .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
 880         .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
 881 #ifdef CONFIG_VIDEO_ADV_DEBUG
 882         .vidioc_g_register              = vidioc_g_register,
 883         .vidioc_s_register              = vidioc_s_register,
 884 #endif
 885 };
 886
 887 static const struct video_device tw68_video_template = {
 888         .name                   = "tw68_video",
 889         .fops                   = &video_fops,
 890         .ioctl_ops              = &video_ioctl_ops,
 891         .release                = video_device_release_empty,
 892         .tvnorms                = TW68_NORMS,
 893         .device_caps            = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
 894                                   V4L2_CAP_STREAMING,
 895 };
 896
 897 /* ------------------------------------------------------------------ */
 898 /* exported stuff                                                     */
 899 void tw68_set_tvnorm_hw(struct tw68_dev *dev)
 900 {
 901         tw_andorb(TW68_SDT, 0x07, dev->tvnorm->format);
 902 }
 903
 904 int tw68_video_init1(struct tw68_dev *dev)
 905 {
 906         struct v4l2_ctrl_handler *hdl = &dev->hdl;
 907
 908         v4l2_ctrl_handler_init(hdl, 6);
 909         v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
 910                         V4L2_CID_BRIGHTNESS, -128, 127, 1, 20);
 911         v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
 912                         V4L2_CID_CONTRAST, 0, 255, 1, 100);
 913         v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
 914                         V4L2_CID_SATURATION, 0, 255, 1, 128);
 915         /* NTSC only */
 916         v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
 917                         V4L2_CID_HUE, -128, 127, 1, 0);
 918         v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
 919                         V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);
 920         v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
 921                         V4L2_CID_CHROMA_AGC, 0, 1, 1, 1);
 922         if (hdl->error) {
 923                 v4l2_ctrl_handler_free(hdl);
 924                 return hdl->error;
 925         }
 926         dev->v4l2_dev.ctrl_handler = hdl;
 927         v4l2_ctrl_handler_setup(hdl);
 928         return 0;
 929 }
 930
 931 int tw68_video_init2(struct tw68_dev *dev, int video_nr)
 932 {
 933         int ret;
 934
 935         set_tvnorm(dev, &tvnorms[0]);
 936
 937         dev->fmt      = format_by_fourcc(V4L2_PIX_FMT_BGR24);
 938         dev->width    = 720;
 939         dev->height   = 576;
 940         dev->field    = V4L2_FIELD_INTERLACED;
 941
 942         INIT_LIST_HEAD(&dev->active);
 943         dev->vidq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 944         dev->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 945         dev->vidq.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ | VB2_DMABUF;
 946         dev->vidq.ops = &tw68_video_qops;
 947         dev->vidq.mem_ops = &vb2_dma_sg_memops;
 948         dev->vidq.drv_priv = dev;
 949         dev->vidq.gfp_flags = __GFP_DMA32 | __GFP_KSWAPD_RECLAIM;
 950         dev->vidq.buf_struct_size = sizeof(struct tw68_buf);
 951         dev->vidq.lock = &dev->lock;
 952         dev->vidq.min_buffers_needed = 2;
 953         dev->vidq.dev = &dev->pci->dev;
 954         ret = vb2_queue_init(&dev->vidq);
 955         if (ret)
 956                 return ret;
 957         dev->vdev = tw68_video_template;
 958         dev->vdev.v4l2_dev = &dev->v4l2_dev;
 959         dev->vdev.lock = &dev->lock;
 960         dev->vdev.queue = &dev->vidq;
 961         video_set_drvdata(&dev->vdev, dev);
 962         return video_register_device(&dev->vdev, VFL_TYPE_VIDEO, video_nr);
 963 }
 964
 965 /*
 966  * tw68_irq_video_done
 967  */
 968 void tw68_irq_video_done(struct tw68_dev *dev, unsigned long status)
 969 {
 970         __u32 reg;
 971
 972         /* reset interrupts handled by this routine */
 973         tw_writel(TW68_INTSTAT, status);
 974         /*
 975          * Check most likely first
 976          *
 977          * DMAPI shows we have reached the end of the risc code
 978          * for the current buffer.
 979          */
 980         if (status & TW68_DMAPI) {
 981                 struct tw68_buf *buf;
 982
 983                 spin_lock(&dev->slock);
 984                 buf = list_entry(dev->active.next, struct tw68_buf, list);
 985                 list_del(&buf->list);
 986                 spin_unlock(&dev->slock);
 987                 buf->vb.vb2_buf.timestamp = ktime_get_ns();
 988                 buf->vb.field = dev->field;
 989                 buf->vb.sequence = dev->seqnr++;
 990                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 991                 status &= ~(TW68_DMAPI);
 992                 if (0 == status)
 993                         return;
 994         }
 995         if (status & (TW68_VLOCK | TW68_HLOCK))
 996                 dev_dbg(&dev->pci->dev, "Lost sync\n");
 997         if (status & TW68_PABORT)
 998                 dev_err(&dev->pci->dev, "PABORT interrupt\n");
 999         if (status & TW68_DMAPERR)
1000                 dev_err(&dev->pci->dev, "DMAPERR interrupt\n");
1001         /*
1002          * On TW6800, FDMIS is apparently generated if video input is switched
1003          * during operation.  Therefore, it is not enabled for that chip.
1004          */
1005         if (status & TW68_FDMIS)
1006                 dev_dbg(&dev->pci->dev, "FDMIS interrupt\n");
1007         if (status & TW68_FFOF) {
1008                 /* probably a logic error */
1009                 reg = tw_readl(TW68_DMAC) & TW68_FIFO_EN;
1010                 tw_clearl(TW68_DMAC, TW68_FIFO_EN);
1011                 dev_dbg(&dev->pci->dev, "FFOF interrupt\n");
1012                 tw_setl(TW68_DMAC, reg);
1013         }
1014         if (status & TW68_FFERR)
1015                 dev_dbg(&dev->pci->dev, "FFERR interrupt\n");
1016 }