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_state *sd_state,
  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_state *sd_state,
 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, sd_state,
 184                                                   pad);
 185
 186         return &ipipe->formats[pad];
 187 }
 188
 189 /*
 190  * ipipe_try_format - Try video format on a pad
 191  * @ipipe: ISS IPIPE device
 192  * @cfg: V4L2 subdev pad config
 193  * @pad: Pad number
 194  * @fmt: Format
 195  */
 196 static void
 197 ipipe_try_format(struct iss_ipipe_device *ipipe,
 198                  struct v4l2_subdev_state *sd_state,
 199                  unsigned int pad,
 200                  struct v4l2_mbus_framefmt *fmt,
 201                  enum v4l2_subdev_format_whence which)
 202 {
 203         struct v4l2_mbus_framefmt *format;
 204         unsigned int width = fmt->width;
 205         unsigned int height = fmt->height;
 206         unsigned int i;
 207
 208         switch (pad) {
 209         case IPIPE_PAD_SINK:
 210                 for (i = 0; i < ARRAY_SIZE(ipipe_fmts); i++) {
 211                         if (fmt->code == ipipe_fmts[i])
 212                                 break;
 213                 }
 214
 215                 /* If not found, use SGRBG10 as default */
 216                 if (i >= ARRAY_SIZE(ipipe_fmts))
 217                         fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
 218
 219                 /* Clamp the input size. */
 220                 fmt->width = clamp_t(u32, width, 1, 8192);
 221                 fmt->height = clamp_t(u32, height, 1, 8192);
 222                 fmt->colorspace = V4L2_COLORSPACE_SRGB;
 223                 break;
 224
 225         case IPIPE_PAD_SOURCE_VP:
 226                 format = __ipipe_get_format(ipipe, sd_state, IPIPE_PAD_SINK,
 227                                             which);
 228                 memcpy(fmt, format, sizeof(*fmt));
 229
 230                 fmt->code = MEDIA_BUS_FMT_UYVY8_1X16;
 231                 fmt->width = clamp_t(u32, width, 32, fmt->width);
 232                 fmt->height = clamp_t(u32, height, 32, fmt->height);
 233                 fmt->colorspace = V4L2_COLORSPACE_JPEG;
 234                 break;
 235         }
 236
 237         fmt->field = V4L2_FIELD_NONE;
 238 }
 239
 240 /*
 241  * ipipe_enum_mbus_code - Handle pixel format enumeration
 242  * @sd     : pointer to v4l2 subdev structure
 243  * @cfg    : V4L2 subdev pad config
 244  * @code   : pointer to v4l2_subdev_mbus_code_enum structure
 245  * return -EINVAL or zero on success
 246  */
 247 static int ipipe_enum_mbus_code(struct v4l2_subdev *sd,
 248                                 struct v4l2_subdev_state *sd_state,
 249                                 struct v4l2_subdev_mbus_code_enum *code)
 250 {
 251         switch (code->pad) {
 252         case IPIPE_PAD_SINK:
 253                 if (code->index >= ARRAY_SIZE(ipipe_fmts))
 254                         return -EINVAL;
 255
 256                 code->code = ipipe_fmts[code->index];
 257                 break;
 258
 259         case IPIPE_PAD_SOURCE_VP:
 260                 /* FIXME: Forced format conversion inside IPIPE ? */
 261                 if (code->index != 0)
 262                         return -EINVAL;
 263
 264                 code->code = MEDIA_BUS_FMT_UYVY8_1X16;
 265                 break;
 266
 267         default:
 268                 return -EINVAL;
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int ipipe_enum_frame_size(struct v4l2_subdev *sd,
 275                                  struct v4l2_subdev_state *sd_state,
 276                                  struct v4l2_subdev_frame_size_enum *fse)
 277 {
 278         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 279         struct v4l2_mbus_framefmt format;
 280
 281         if (fse->index != 0)
 282                 return -EINVAL;
 283
 284         format.code = fse->code;
 285         format.width = 1;
 286         format.height = 1;
 287         ipipe_try_format(ipipe, sd_state, fse->pad, &format, fse->which);
 288         fse->min_width = format.width;
 289         fse->min_height = format.height;
 290
 291         if (format.code != fse->code)
 292                 return -EINVAL;
 293
 294         format.code = fse->code;
 295         format.width = -1;
 296         format.height = -1;
 297         ipipe_try_format(ipipe, sd_state, fse->pad, &format, fse->which);
 298         fse->max_width = format.width;
 299         fse->max_height = format.height;
 300
 301         return 0;
 302 }
 303
 304 /*
 305  * ipipe_get_format - Retrieve the video format on a pad
 306  * @sd : ISP IPIPE V4L2 subdevice
 307  * @cfg: V4L2 subdev pad config
 308  * @fmt: Format
 309  *
 310  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 311  * to the format type.
 312  */
 313 static int ipipe_get_format(struct v4l2_subdev *sd,
 314                             struct v4l2_subdev_state *sd_state,
 315                             struct v4l2_subdev_format *fmt)
 316 {
 317         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 318         struct v4l2_mbus_framefmt *format;
 319
 320         format = __ipipe_get_format(ipipe, sd_state, fmt->pad, fmt->which);
 321         if (!format)
 322                 return -EINVAL;
 323
 324         fmt->format = *format;
 325         return 0;
 326 }
 327
 328 /*
 329  * ipipe_set_format - Set the video format on a pad
 330  * @sd : ISP IPIPE V4L2 subdevice
 331  * @cfg: V4L2 subdev pad config
 332  * @fmt: Format
 333  *
 334  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 335  * to the format type.
 336  */
 337 static int ipipe_set_format(struct v4l2_subdev *sd,
 338                             struct v4l2_subdev_state *sd_state,
 339                             struct v4l2_subdev_format *fmt)
 340 {
 341         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 342         struct v4l2_mbus_framefmt *format;
 343
 344         format = __ipipe_get_format(ipipe, sd_state, fmt->pad, fmt->which);
 345         if (!format)
 346                 return -EINVAL;
 347
 348         ipipe_try_format(ipipe, sd_state, fmt->pad, &fmt->format, fmt->which);
 349         *format = fmt->format;
 350
 351         /* Propagate the format from sink to source */
 352         if (fmt->pad == IPIPE_PAD_SINK) {
 353                 format = __ipipe_get_format(ipipe, sd_state,
 354                                             IPIPE_PAD_SOURCE_VP,
 355                                             fmt->which);
 356                 *format = fmt->format;
 357                 ipipe_try_format(ipipe, sd_state, IPIPE_PAD_SOURCE_VP, format,
 358                                  fmt->which);
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int ipipe_link_validate(struct v4l2_subdev *sd, struct media_link *link,
 365                                struct v4l2_subdev_format *source_fmt,
 366                                struct v4l2_subdev_format *sink_fmt)
 367 {
 368         /* Check if the two ends match */
 369         if (source_fmt->format.width != sink_fmt->format.width ||
 370             source_fmt->format.height != sink_fmt->format.height)
 371                 return -EPIPE;
 372
 373         if (source_fmt->format.code != sink_fmt->format.code)
 374                 return -EPIPE;
 375
 376         return 0;
 377 }
 378
 379 /*
 380  * ipipe_init_formats - Initialize formats on all pads
 381  * @sd: ISP IPIPE V4L2 subdevice
 382  * @fh: V4L2 subdev file handle
 383  *
 384  * Initialize all pad formats with default values. If fh is not NULL, try
 385  * formats are initialized on the file handle. Otherwise active formats are
 386  * initialized on the device.
 387  */
 388 static int ipipe_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 389 {
 390         struct v4l2_subdev_format format;
 391
 392         memset(&format, 0, sizeof(format));
 393         format.pad = IPIPE_PAD_SINK;
 394         format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
 395         format.format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
 396         format.format.width = 4096;
 397         format.format.height = 4096;
 398         ipipe_set_format(sd, fh ? fh->state : NULL, &format);
 399
 400         return 0;
 401 }
 402
 403 /* V4L2 subdev video operations */
 404 static const struct v4l2_subdev_video_ops ipipe_v4l2_video_ops = {
 405         .s_stream = ipipe_set_stream,
 406 };
 407
 408 /* V4L2 subdev pad operations */
 409 static const struct v4l2_subdev_pad_ops ipipe_v4l2_pad_ops = {
 410         .enum_mbus_code = ipipe_enum_mbus_code,
 411         .enum_frame_size = ipipe_enum_frame_size,
 412         .get_fmt = ipipe_get_format,
 413         .set_fmt = ipipe_set_format,
 414         .link_validate = ipipe_link_validate,
 415 };
 416
 417 /* V4L2 subdev operations */
 418 static const struct v4l2_subdev_ops ipipe_v4l2_ops = {
 419         .video = &ipipe_v4l2_video_ops,
 420         .pad = &ipipe_v4l2_pad_ops,
 421 };
 422
 423 /* V4L2 subdev internal operations */
 424 static const struct v4l2_subdev_internal_ops ipipe_v4l2_internal_ops = {
 425         .open = ipipe_init_formats,
 426 };
 427
 428 /* -----------------------------------------------------------------------------
 429  * Media entity operations
 430  */
 431
 432 /*
 433  * ipipe_link_setup - Setup IPIPE connections
 434  * @entity: IPIPE media entity
 435  * @local: Pad at the local end of the link
 436  * @remote: Pad at the remote end of the link
 437  * @flags: Link flags
 438  *
 439  * return -EINVAL or zero on success
 440  */
 441 static int ipipe_link_setup(struct media_entity *entity,
 442                             const struct media_pad *local,
 443                             const struct media_pad *remote, u32 flags)
 444 {
 445         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
 446         struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 447         struct iss_device *iss = to_iss_device(ipipe);
 448
 449         if (!is_media_entity_v4l2_subdev(remote->entity))
 450                 return -EINVAL;
 451
 452         switch (local->index) {
 453         case IPIPE_PAD_SINK:
 454                 /* Read from IPIPEIF. */
 455                 if (!(flags & MEDIA_LNK_FL_ENABLED)) {
 456                         ipipe->input = IPIPE_INPUT_NONE;
 457                         break;
 458                 }
 459
 460                 if (ipipe->input != IPIPE_INPUT_NONE)
 461                         return -EBUSY;
 462
 463                 if (remote->entity == &iss->ipipeif.subdev.entity)
 464                         ipipe->input = IPIPE_INPUT_IPIPEIF;
 465
 466                 break;
 467
 468         case IPIPE_PAD_SOURCE_VP:
 469                 /* Send to RESIZER */
 470                 if (flags & MEDIA_LNK_FL_ENABLED) {
 471                         if (ipipe->output & ~IPIPE_OUTPUT_VP)
 472                                 return -EBUSY;
 473                         ipipe->output |= IPIPE_OUTPUT_VP;
 474                 } else {
 475                         ipipe->output &= ~IPIPE_OUTPUT_VP;
 476                 }
 477                 break;
 478
 479         default:
 480                 return -EINVAL;
 481         }
 482
 483         return 0;
 484 }
 485
 486 /* media operations */
 487 static const struct media_entity_operations ipipe_media_ops = {
 488         .link_setup = ipipe_link_setup,
 489         .link_validate = v4l2_subdev_link_validate,
 490 };
 491
 492 /*
 493  * ipipe_init_entities - Initialize V4L2 subdev and media entity
 494  * @ipipe: ISS ISP IPIPE module
 495  *
 496  * Return 0 on success and a negative error code on failure.
 497  */
 498 static int ipipe_init_entities(struct iss_ipipe_device *ipipe)
 499 {
 500         struct v4l2_subdev *sd = &ipipe->subdev;
 501         struct media_pad *pads = ipipe->pads;
 502         struct media_entity *me = &sd->entity;
 503         int ret;
 504
 505         ipipe->input = IPIPE_INPUT_NONE;
 506
 507         v4l2_subdev_init(sd, &ipipe_v4l2_ops);
 508         sd->internal_ops = &ipipe_v4l2_internal_ops;
 509         strscpy(sd->name, "OMAP4 ISS ISP IPIPE", sizeof(sd->name));
 510         sd->grp_id = BIT(16);   /* group ID for iss subdevs */
 511         v4l2_set_subdevdata(sd, ipipe);
 512         sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 513
 514         pads[IPIPE_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 515         pads[IPIPE_PAD_SOURCE_VP].flags = MEDIA_PAD_FL_SOURCE;
 516
 517         me->ops = &ipipe_media_ops;
 518         ret = media_entity_pads_init(me, IPIPE_PADS_NUM, pads);
 519         if (ret < 0)
 520                 return ret;
 521
 522         ipipe_init_formats(sd, NULL);
 523
 524         return 0;
 525 }
 526
 527 void omap4iss_ipipe_unregister_entities(struct iss_ipipe_device *ipipe)
 528 {
 529         v4l2_device_unregister_subdev(&ipipe->subdev);
 530 }
 531
 532 int omap4iss_ipipe_register_entities(struct iss_ipipe_device *ipipe,
 533                                      struct v4l2_device *vdev)
 534 {
 535         int ret;
 536
 537         /* Register the subdev and video node. */
 538         ret = v4l2_device_register_subdev(vdev, &ipipe->subdev);
 539         if (ret < 0)
 540                 goto error;
 541
 542         return 0;
 543
 544 error:
 545         omap4iss_ipipe_unregister_entities(ipipe);
 546         return ret;
 547 }
 548
 549 /* -----------------------------------------------------------------------------
 550  * ISP IPIPE initialisation and cleanup
 551  */
 552
 553 /*
 554  * omap4iss_ipipe_init - IPIPE module initialization.
 555  * @iss: Device pointer specific to the OMAP4 ISS.
 556  *
 557  * TODO: Get the initialisation values from platform data.
 558  *
 559  * Return 0 on success or a negative error code otherwise.
 560  */
 561 int omap4iss_ipipe_init(struct iss_device *iss)
 562 {
 563         struct iss_ipipe_device *ipipe = &iss->ipipe;
 564
 565         ipipe->state = ISS_PIPELINE_STREAM_STOPPED;
 566         init_waitqueue_head(&ipipe->wait);
 567
 568         return ipipe_init_entities(ipipe);
 569 }
 570
 571 /*
 572  * omap4iss_ipipe_cleanup - IPIPE module cleanup.
 573  * @iss: Device pointer specific to the OMAP4 ISS.
 574  */
 575 void omap4iss_ipipe_cleanup(struct iss_device *iss)
 576 {
 577         struct iss_ipipe_device *ipipe = &iss->ipipe;
 578
 579         media_entity_cleanup(&ipipe->subdev.entity);
 580 }