drivers/staging/media/omap4iss/iss_ipipe.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * TI OMAP4 ISS V4L2 Driver - ISP IPIPE module
   4  *
   5  * Copyright (C) 2012 Texas Instruments, Inc.
   6  *
   7  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/uaccess.h>
  12 #include <linux/delay.h>
  13 #include <linux/device.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/mm.h>
  16 #include <linux/sched.h>
  17
  18 #include "iss.h"
  19 #include "iss_regs.h"
  20 #include "iss_ipipe.h"
  21
  22 static struct v4l2_mbus_framefmt *
  23 __ipipe_get_format(struct iss_ipipe_device *ipipe,
  24                    struct v4l2_subdev_pad_config *cfg,
  25                    unsigned int pad,
  26                    enum v4l2_subdev_format_whence which);
  27
  28 static const unsigned int ipipe_fmts[] = {
  29         MEDIA_BUS_FMT_SGRBG10_1X10,
  30         MEDIA_BUS_FMT_SRGGB10_1X10,
  31         MEDIA_BUS_FMT_SBGGR10_1X10,
  32         MEDIA_BUS_FMT_SGBRG10_1X10,
  33 };
  34
  35 /*
  36  * ipipe_print_status - Print current IPIPE Module register values.
  37  * @ipipe: Pointer to ISS ISP IPIPE device.
  38  *
  39  * Also prints other debug information stored in the IPIPE module.
  40  */
  41 #define IPIPE_PRINT_REGISTER(iss, name)\
  42         dev_dbg(iss->dev, "###IPIPE " #name "=0x%08x\n", \
  43                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_##name))
  44
  45 static void ipipe_print_status(struct iss_ipipe_device *ipipe)
  46 {
  47         struct iss_device *iss = to_iss_device(ipipe);
  48
  49         dev_dbg(iss->dev, "-------------IPIPE Register dump-------------\n");
  50
  51         IPIPE_PRINT_REGISTER(iss, SRC_EN);
  52         IPIPE_PRINT_REGISTER(iss, SRC_MODE);
  53         IPIPE_PRINT_REGISTER(iss, SRC_FMT);
  54         IPIPE_PRINT_REGISTER(iss, SRC_COL);
  55         IPIPE_PRINT_REGISTER(iss, SRC_VPS);
  56         IPIPE_PRINT_REGISTER(iss, SRC_VSZ);
  57         IPIPE_PRINT_REGISTER(iss, SRC_HPS);
  58         IPIPE_PRINT_REGISTER(iss, SRC_HSZ);
  59         IPIPE_PRINT_REGISTER(iss, GCK_MMR);
  60         IPIPE_PRINT_REGISTER(iss, YUV_PHS);
  61
  62         dev_dbg(iss->dev, "-----------------------------------------------\n");
  63 }
  64
  65 /*
  66  * ipipe_enable - Enable/Disable IPIPE.
  67  * @enable: enable flag
  68  *
  69  */
  70 static void ipipe_enable(struct iss_ipipe_device *ipipe, u8 enable)
  71 {
  72         struct iss_device *iss = to_iss_device(ipipe);
  73
  74         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_EN,
  75                        IPIPE_SRC_EN_EN, enable ? IPIPE_SRC_EN_EN : 0);
  76 }
  77
  78 /* -----------------------------------------------------------------------------
  79  * Format- and pipeline-related configuration helpers
  80  */
  81
  82 static void ipipe_configure(struct iss_ipipe_device *ipipe)
  83 {
  84         struct iss_device *iss = to_iss_device(ipipe);
  85         struct v4l2_mbus_framefmt *format;
  86
  87         /* IPIPE_PAD_SINK */
  88         format = &ipipe->formats[IPIPE_PAD_SINK];
  89
  90         /* NOTE: Currently just supporting pipeline IN: RGB, OUT: YUV422 */
  91         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_FMT,
  92                       IPIPE_SRC_FMT_RAW2YUV);
  93
  94         /* Enable YUV444 -> YUV422 conversion */
  95         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_YUV_PHS,
  96                       IPIPE_YUV_PHS_LPF);
  97
  98         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_VPS, 0);
  99         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_HPS, 0);
 100         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_VSZ,
 101                       (format->height - 2) & IPIPE_SRC_VSZ_MASK);
 102         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_HSZ,
 103                       (format->width - 1) & IPIPE_SRC_HSZ_MASK);
 104
 105         /* Ignore ipipeif_wrt signal, and operate on-the-fly.  */
 106         iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_MODE,
 107                     IPIPE_SRC_MODE_WRT | IPIPE_SRC_MODE_OST);
 108
 109         /* HACK: Values tuned for Ducati SW (OV) */
 110         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_COL,
 111                       IPIPE_SRC_COL_EE_B | IPIPE_SRC_COL_EO_GB |
 112                       IPIPE_SRC_COL_OE_GR | IPIPE_SRC_COL_OO_R);
 113
 114         /* IPIPE_PAD_SOURCE_VP */
 115         format = &ipipe->formats[IPIPE_PAD_SOURCE_VP];
 116         /* Do nothing? */
 117 }
 118
 119 /* -----------------------------------------------------------------------------
 120  * V4L2 subdev operations
 121  */
 122
 123 /*
 124  * ipipe_set_stream - Enable/Disable streaming on the IPIPE module
 125  * @sd: ISP IPIPE V4L2 subdevice
 126  * @enable: Enable/disable stream
 127  */
 128 static int ipipe_set_stream(struct v4l2_subdev *sd, int enable)
 129 {
 130         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 131         struct iss_device *iss = to_iss_device(ipipe);
 132         int ret = 0;
 133
 134         if (ipipe->state == ISS_PIPELINE_STREAM_STOPPED) {
 135                 if (enable == ISS_PIPELINE_STREAM_STOPPED)
 136                         return 0;
 137
 138                 omap4iss_isp_subclk_enable(iss, OMAP4_ISS_ISP_SUBCLK_IPIPE);
 139
 140                 /* Enable clk_arm_g0 */
 141                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_GCK_MMR,
 142                               IPIPE_GCK_MMR_REG);
 143
 144                 /* Enable clk_pix_g[3:0] */
 145                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_GCK_PIX,
 146                               IPIPE_GCK_PIX_G3 | IPIPE_GCK_PIX_G2 |
 147                               IPIPE_GCK_PIX_G1 | IPIPE_GCK_PIX_G0);
 148         }
 149
 150         switch (enable) {
 151         case ISS_PIPELINE_STREAM_CONTINUOUS:
 152
 153                 ipipe_configure(ipipe);
 154                 ipipe_print_status(ipipe);
 155
 156                 atomic_set(&ipipe->stopping, 0);
 157                 ipipe_enable(ipipe, 1);
 158                 break;
 159
 160         case ISS_PIPELINE_STREAM_STOPPED:
 161                 if (ipipe->state == ISS_PIPELINE_STREAM_STOPPED)
 162                         return 0;
 163                 if (omap4iss_module_sync_idle(&sd->entity, &ipipe->wait,
 164                                               &ipipe->stopping))
 165                         ret = -ETIMEDOUT;
 166
 167                 ipipe_enable(ipipe, 0);
 168                 omap4iss_isp_subclk_disable(iss, OMAP4_ISS_ISP_SUBCLK_IPIPE);
 169                 break;
 170         }
 171
 172         ipipe->state = enable;
 173         return ret;
 174 }
 175
 176 static struct v4l2_mbus_framefmt *
 177 __ipipe_get_format(struct iss_ipipe_device *ipipe,
 178                    struct v4l2_subdev_pad_config *cfg,
 179                    unsigned int pad,
 180                    enum v4l2_subdev_format_whence which)
 181 {
 182         if (which == V4L2_SUBDEV_FORMAT_TRY)
 183                 return v4l2_subdev_get_try_format(&ipipe->subdev, cfg, pad);
 184
 185         return &ipipe->formats[pad];
 186 }
 187
 188 /*
 189  * ipipe_try_format - Try video format on a pad
 190  * @ipipe: ISS IPIPE device
 191  * @cfg: V4L2 subdev pad config
 192  * @pad: Pad number
 193  * @fmt: Format
 194  */
 195 static void
 196 ipipe_try_format(struct iss_ipipe_device *ipipe,
 197                  struct v4l2_subdev_pad_config *cfg,
 198                  unsigned int pad,
 199                  struct v4l2_mbus_framefmt *fmt,
 200                  enum v4l2_subdev_format_whence which)
 201 {
 202         struct v4l2_mbus_framefmt *format;
 203         unsigned int width = fmt->width;
 204         unsigned int height = fmt->height;
 205         unsigned int i;
 206
 207         switch (pad) {
 208         case IPIPE_PAD_SINK:
 209                 for (i = 0; i < ARRAY_SIZE(ipipe_fmts); i++) {
 210                         if (fmt->code == ipipe_fmts[i])
 211                                 break;
 212                 }
 213
 214                 /* If not found, use SGRBG10 as default */
 215                 if (i >= ARRAY_SIZE(ipipe_fmts))
 216                         fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
 217
 218                 /* Clamp the input size. */
 219                 fmt->width = clamp_t(u32, width, 1, 8192);
 220                 fmt->height = clamp_t(u32, height, 1, 8192);
 221                 fmt->colorspace = V4L2_COLORSPACE_SRGB;
 222                 break;
 223
 224         case IPIPE_PAD_SOURCE_VP:
 225                 format = __ipipe_get_format(ipipe, cfg, IPIPE_PAD_SINK, which);
 226                 memcpy(fmt, format, sizeof(*fmt));
 227
 228                 fmt->code = MEDIA_BUS_FMT_UYVY8_1X16;
 229                 fmt->width = clamp_t(u32, width, 32, fmt->width);
 230                 fmt->height = clamp_t(u32, height, 32, fmt->height);
 231                 fmt->colorspace = V4L2_COLORSPACE_JPEG;
 232                 break;
 233         }
 234
 235         fmt->field = V4L2_FIELD_NONE;
 236 }
 237
 238 /*
 239  * ipipe_enum_mbus_code - Handle pixel format enumeration
 240  * @sd     : pointer to v4l2 subdev structure
 241  * @cfg    : V4L2 subdev pad config
 242  * @code   : pointer to v4l2_subdev_mbus_code_enum structure
 243  * return -EINVAL or zero on success
 244  */
 245 static int ipipe_enum_mbus_code(struct v4l2_subdev *sd,
 246                                 struct v4l2_subdev_pad_config *cfg,
 247                                 struct v4l2_subdev_mbus_code_enum *code)
 248 {
 249         switch (code->pad) {
 250         case IPIPE_PAD_SINK:
 251                 if (code->index >= ARRAY_SIZE(ipipe_fmts))
 252                         return -EINVAL;
 253
 254                 code->code = ipipe_fmts[code->index];
 255                 break;
 256
 257         case IPIPE_PAD_SOURCE_VP:
 258                 /* FIXME: Forced format conversion inside IPIPE ? */
 259                 if (code->index != 0)
 260                         return -EINVAL;
 261
 262                 code->code = MEDIA_BUS_FMT_UYVY8_1X16;
 263                 break;
 264
 265         default:
 266                 return -EINVAL;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static int ipipe_enum_frame_size(struct v4l2_subdev *sd,
 273                                  struct v4l2_subdev_pad_config *cfg,
 274                                  struct v4l2_subdev_frame_size_enum *fse)
 275 {
 276         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 277         struct v4l2_mbus_framefmt format;
 278
 279         if (fse->index != 0)
 280                 return -EINVAL;
 281
 282         format.code = fse->code;
 283         format.width = 1;
 284         format.height = 1;
 285         ipipe_try_format(ipipe, cfg, fse->pad, &format, fse->which);
 286         fse->min_width = format.width;
 287         fse->min_height = format.height;
 288
 289         if (format.code != fse->code)
 290                 return -EINVAL;
 291
 292         format.code = fse->code;
 293         format.width = -1;
 294         format.height = -1;
 295         ipipe_try_format(ipipe, cfg, fse->pad, &format, fse->which);
 296         fse->max_width = format.width;
 297         fse->max_height = format.height;
 298
 299         return 0;
 300 }
 301
 302 /*
 303  * ipipe_get_format - Retrieve the video format on a pad
 304  * @sd : ISP IPIPE V4L2 subdevice
 305  * @cfg: V4L2 subdev pad config
 306  * @fmt: Format
 307  *
 308  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 309  * to the format type.
 310  */
 311 static int ipipe_get_format(struct v4l2_subdev *sd,
 312                             struct v4l2_subdev_pad_config *cfg,
 313                             struct v4l2_subdev_format *fmt)
 314 {
 315         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 316         struct v4l2_mbus_framefmt *format;
 317
 318         format = __ipipe_get_format(ipipe, cfg, fmt->pad, fmt->which);
 319         if (!format)
 320                 return -EINVAL;
 321
 322         fmt->format = *format;
 323         return 0;
 324 }
 325
 326 /*
 327  * ipipe_set_format - Set the video format on a pad
 328  * @sd : ISP IPIPE V4L2 subdevice
 329  * @cfg: V4L2 subdev pad config
 330  * @fmt: Format
 331  *
 332  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 333  * to the format type.
 334  */
 335 static int ipipe_set_format(struct v4l2_subdev *sd,
 336                             struct v4l2_subdev_pad_config *cfg,
 337                             struct v4l2_subdev_format *fmt)
 338 {
 339         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 340         struct v4l2_mbus_framefmt *format;
 341
 342         format = __ipipe_get_format(ipipe, cfg, fmt->pad, fmt->which);
 343         if (!format)
 344                 return -EINVAL;
 345
 346         ipipe_try_format(ipipe, cfg, fmt->pad, &fmt->format, fmt->which);
 347         *format = fmt->format;
 348
 349         /* Propagate the format from sink to source */
 350         if (fmt->pad == IPIPE_PAD_SINK) {
 351                 format = __ipipe_get_format(ipipe, cfg, IPIPE_PAD_SOURCE_VP,
 352                                             fmt->which);
 353                 *format = fmt->format;
 354                 ipipe_try_format(ipipe, cfg, IPIPE_PAD_SOURCE_VP, format,
 355                                  fmt->which);
 356         }
 357
 358         return 0;
 359 }
 360
 361 static int ipipe_link_validate(struct v4l2_subdev *sd, struct media_link *link,
 362                                struct v4l2_subdev_format *source_fmt,
 363                                struct v4l2_subdev_format *sink_fmt)
 364 {
 365         /* Check if the two ends match */
 366         if (source_fmt->format.width != sink_fmt->format.width ||
 367             source_fmt->format.height != sink_fmt->format.height)
 368                 return -EPIPE;
 369
 370         if (source_fmt->format.code != sink_fmt->format.code)
 371                 return -EPIPE;
 372
 373         return 0;
 374 }
 375
 376 /*
 377  * ipipe_init_formats - Initialize formats on all pads
 378  * @sd: ISP IPIPE V4L2 subdevice
 379  * @fh: V4L2 subdev file handle
 380  *
 381  * Initialize all pad formats with default values. If fh is not NULL, try
 382  * formats are initialized on the file handle. Otherwise active formats are
 383  * initialized on the device.
 384  */
 385 static int ipipe_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 386 {
 387         struct v4l2_subdev_format format;
 388
 389         memset(&format, 0, sizeof(format));
 390         format.pad = IPIPE_PAD_SINK;
 391         format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
 392         format.format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
 393         format.format.width = 4096;
 394         format.format.height = 4096;
 395         ipipe_set_format(sd, fh ? fh->pad : NULL, &format);
 396
 397         return 0;
 398 }
 399
 400 /* V4L2 subdev video operations */
 401 static const struct v4l2_subdev_video_ops ipipe_v4l2_video_ops = {
 402         .s_stream = ipipe_set_stream,
 403 };
 404
 405 /* V4L2 subdev pad operations */
 406 static const struct v4l2_subdev_pad_ops ipipe_v4l2_pad_ops = {
 407         .enum_mbus_code = ipipe_enum_mbus_code,
 408         .enum_frame_size = ipipe_enum_frame_size,
 409         .get_fmt = ipipe_get_format,
 410         .set_fmt = ipipe_set_format,
 411         .link_validate = ipipe_link_validate,
 412 };
 413
 414 /* V4L2 subdev operations */
 415 static const struct v4l2_subdev_ops ipipe_v4l2_ops = {
 416         .video = &ipipe_v4l2_video_ops,
 417         .pad = &ipipe_v4l2_pad_ops,
 418 };
 419
 420 /* V4L2 subdev internal operations */
 421 static const struct v4l2_subdev_internal_ops ipipe_v4l2_internal_ops = {
 422         .open = ipipe_init_formats,
 423 };
 424
 425 /* -----------------------------------------------------------------------------
 426  * Media entity operations
 427  */
 428
 429 /*
 430  * ipipe_link_setup - Setup IPIPE connections
 431  * @entity: IPIPE media entity
 432  * @local: Pad at the local end of the link
 433  * @remote: Pad at the remote end of the link
 434  * @flags: Link flags
 435  *
 436  * return -EINVAL or zero on success
 437  */
 438 static int ipipe_link_setup(struct media_entity *entity,
 439                             const struct media_pad *local,
 440                             const struct media_pad *remote, u32 flags)
 441 {
 442         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
 443         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 444         struct iss_device *iss = to_iss_device(ipipe);
 445
 446         if (!is_media_entity_v4l2_subdev(remote->entity))
 447                 return -EINVAL;
 448
 449         switch (local->index) {
 450         case IPIPE_PAD_SINK:
 451                 /* Read from IPIPEIF. */
 452                 if (!(flags & MEDIA_LNK_FL_ENABLED)) {
 453                         ipipe->input = IPIPE_INPUT_NONE;
 454                         break;
 455                 }
 456
 457                 if (ipipe->input != IPIPE_INPUT_NONE)
 458                         return -EBUSY;
 459
 460                 if (remote->entity == &iss->ipipeif.subdev.entity)
 461                         ipipe->input = IPIPE_INPUT_IPIPEIF;
 462
 463                 break;
 464
 465         case IPIPE_PAD_SOURCE_VP:
 466                 /* Send to RESIZER */
 467                 if (flags & MEDIA_LNK_FL_ENABLED) {
 468                         if (ipipe->output & ~IPIPE_OUTPUT_VP)
 469                                 return -EBUSY;
 470                         ipipe->output |= IPIPE_OUTPUT_VP;
 471                 } else {
 472                         ipipe->output &= ~IPIPE_OUTPUT_VP;
 473                 }
 474                 break;
 475
 476         default:
 477                 return -EINVAL;
 478         }
 479
 480         return 0;
 481 }
 482
 483 /* media operations */
 484 static const struct media_entity_operations ipipe_media_ops = {
 485         .link_setup = ipipe_link_setup,
 486         .link_validate = v4l2_subdev_link_validate,
 487 };
 488
 489 /*
 490  * ipipe_init_entities - Initialize V4L2 subdev and media entity
 491  * @ipipe: ISS ISP IPIPE module
 492  *
 493  * Return 0 on success and a negative error code on failure.
 494  */
 495 static int ipipe_init_entities(struct iss_ipipe_device *ipipe)
 496 {
 497         struct v4l2_subdev *sd = &ipipe->subdev;
 498         struct media_pad *pads = ipipe->pads;
 499         struct media_entity *me = &sd->entity;
 500         int ret;
 501
 502         ipipe->input = IPIPE_INPUT_NONE;
 503
 504         v4l2_subdev_init(sd, &ipipe_v4l2_ops);
 505         sd->internal_ops = &ipipe_v4l2_internal_ops;
 506         strscpy(sd->name, "OMAP4 ISS ISP IPIPE", sizeof(sd->name));
 507         sd->grp_id = BIT(16);   /* group ID for iss subdevs */
 508         v4l2_set_subdevdata(sd, ipipe);
 509         sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 510
 511         pads[IPIPE_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 512         pads[IPIPE_PAD_SOURCE_VP].flags = MEDIA_PAD_FL_SOURCE;
 513
 514         me->ops = &ipipe_media_ops;
 515         ret = media_entity_pads_init(me, IPIPE_PADS_NUM, pads);
 516         if (ret < 0)
 517                 return ret;
 518
 519         ipipe_init_formats(sd, NULL);
 520
 521         return 0;
 522 }
 523
 524 void omap4iss_ipipe_unregister_entities(struct iss_ipipe_device *ipipe)
 525 {
 526         v4l2_device_unregister_subdev(&ipipe->subdev);
 527 }
 528
 529 int omap4iss_ipipe_register_entities(struct iss_ipipe_device *ipipe,
 530                                      struct v4l2_device *vdev)
 531 {
 532         int ret;
 533
 534         /* Register the subdev and video node. */
 535         ret = v4l2_device_register_subdev(vdev, &ipipe->subdev);
 536         if (ret < 0)
 537                 goto error;
 538
 539         return 0;
 540
 541 error:
 542         omap4iss_ipipe_unregister_entities(ipipe);
 543         return ret;
 544 }
 545
 546 /* -----------------------------------------------------------------------------
 547  * ISP IPIPE initialisation and cleanup
 548  */
 549
 550 /*
 551  * omap4iss_ipipe_init - IPIPE module initialization.
 552  * @iss: Device pointer specific to the OMAP4 ISS.
 553  *
 554  * TODO: Get the initialisation values from platform data.
 555  *
 556  * Return 0 on success or a negative error code otherwise.
 557  */
 558 int omap4iss_ipipe_init(struct iss_device *iss)
 559 {
 560         struct iss_ipipe_device *ipipe = &iss->ipipe;
 561
 562         ipipe->state = ISS_PIPELINE_STREAM_STOPPED;
 563         init_waitqueue_head(&ipipe->wait);
 564
 565         return ipipe_init_entities(ipipe);
 566 }
 567
 568 /*
 569  * omap4iss_ipipe_cleanup - IPIPE module cleanup.
 570  * @iss: Device pointer specific to the OMAP4 ISS.
 571  */
 572 void omap4iss_ipipe_cleanup(struct iss_device *iss)
 573 {
 574         struct iss_ipipe_device *ipipe = &iss->ipipe;
 575
 576         media_entity_cleanup(&ipipe->subdev.entity);
 577 }