drivers/media/platform/s3c-camif/camif-core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * s3c24xx/s3c64xx SoC series Camera Interface (CAMIF) driver
   4  *
   5  * Copyright (C) 2012 Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
   6  * Copyright (C) 2012 Tomasz Figa <tomasz.figa@gmail.com>
   7  */
   8 #define pr_fmt(fmt) "%s:%d " fmt, __func__, __LINE__
   9
  10 #include <linux/bug.h>
  11 #include <linux/clk.h>
  12 #include <linux/delay.h>
  13 #include <linux/device.h>
  14 #include <linux/errno.h>
  15 #include <linux/gpio.h>
  16 #include <linux/i2c.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/kernel.h>
  20 #include <linux/list.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/slab.h>
  25 #include <linux/types.h>
  26 #include <linux/version.h>
  27
  28 #include <media/media-device.h>
  29 #include <media/v4l2-ctrls.h>
  30 #include <media/v4l2-ioctl.h>
  31 #include <media/videobuf2-v4l2.h>
  32 #include <media/videobuf2-dma-contig.h>
  33
  34 #include "camif-core.h"
  35
  36 static char *camif_clocks[CLK_MAX_NUM] = {
  37         /* HCLK CAMIF clock */
  38         [CLK_GATE]      = "camif",
  39         /* CAMIF / external camera sensor master clock */
  40         [CLK_CAM]       = "camera",
  41 };
  42
  43 static const struct camif_fmt camif_formats[] = {
  44         {
  45                 .fourcc         = V4L2_PIX_FMT_YUV422P,
  46                 .depth          = 16,
  47                 .ybpp           = 1,
  48                 .color          = IMG_FMT_YCBCR422P,
  49                 .colplanes      = 3,
  50                 .flags          = FMT_FL_S3C24XX_CODEC |
  51                                   FMT_FL_S3C64XX,
  52         }, {
  53                 .fourcc         = V4L2_PIX_FMT_YUV420,
  54                 .depth          = 12,
  55                 .ybpp           = 1,
  56                 .color          = IMG_FMT_YCBCR420,
  57                 .colplanes      = 3,
  58                 .flags          = FMT_FL_S3C24XX_CODEC |
  59                                   FMT_FL_S3C64XX,
  60         }, {
  61                 .fourcc         = V4L2_PIX_FMT_YVU420,
  62                 .depth          = 12,
  63                 .ybpp           = 1,
  64                 .color          = IMG_FMT_YCRCB420,
  65                 .colplanes      = 3,
  66                 .flags          = FMT_FL_S3C24XX_CODEC |
  67                                   FMT_FL_S3C64XX,
  68         }, {
  69                 .fourcc         = V4L2_PIX_FMT_RGB565X,
  70                 .depth          = 16,
  71                 .ybpp           = 2,
  72                 .color          = IMG_FMT_RGB565,
  73                 .colplanes      = 1,
  74                 .flags          = FMT_FL_S3C24XX_PREVIEW |
  75                                   FMT_FL_S3C64XX,
  76         }, {
  77                 .fourcc         = V4L2_PIX_FMT_RGB32,
  78                 .depth          = 32,
  79                 .ybpp           = 4,
  80                 .color          = IMG_FMT_XRGB8888,
  81                 .colplanes      = 1,
  82                 .flags          = FMT_FL_S3C24XX_PREVIEW |
  83                                   FMT_FL_S3C64XX,
  84         }, {
  85                 .fourcc         = V4L2_PIX_FMT_BGR666,
  86                 .depth          = 32,
  87                 .ybpp           = 4,
  88                 .color          = IMG_FMT_RGB666,
  89                 .colplanes      = 1,
  90                 .flags          = FMT_FL_S3C64XX,
  91         }
  92 };
  93
  94 /**
  95  * s3c_camif_find_format() - lookup camif color format by fourcc or an index
  96  * @vp: video path (DMA) description (codec/preview)
  97  * @pixelformat: fourcc to match, ignored if null
  98  * @index: index to the camif_formats array, ignored if negative
  99  */
 100 const struct camif_fmt *s3c_camif_find_format(struct camif_vp *vp,
 101                                               const u32 *pixelformat,
 102                                               int index)
 103 {
 104         const struct camif_fmt *fmt, *def_fmt = NULL;
 105         unsigned int i;
 106         int id = 0;
 107
 108         if (index >= (int)ARRAY_SIZE(camif_formats))
 109                 return NULL;
 110
 111         for (i = 0; i < ARRAY_SIZE(camif_formats); ++i) {
 112                 fmt = &camif_formats[i];
 113                 if (vp && !(vp->fmt_flags & fmt->flags))
 114                         continue;
 115                 if (pixelformat && fmt->fourcc == *pixelformat)
 116                         return fmt;
 117                 if (index == id)
 118                         def_fmt = fmt;
 119                 id++;
 120         }
 121         return def_fmt;
 122 }
 123
 124 static int camif_get_scaler_factor(u32 src, u32 tar, u32 *ratio, u32 *shift)
 125 {
 126         unsigned int sh = 6;
 127
 128         if (src >= 64 * tar)
 129                 return -EINVAL;
 130
 131         while (sh--) {
 132                 unsigned int tmp = 1 << sh;
 133                 if (src >= tar * tmp) {
 134                         *shift = sh, *ratio = tmp;
 135                         return 0;
 136                 }
 137         }
 138         *shift = 0, *ratio = 1;
 139         return 0;
 140 }
 141
 142 int s3c_camif_get_scaler_config(struct camif_vp *vp,
 143                                 struct camif_scaler *scaler)
 144 {
 145         struct v4l2_rect *camif_crop = &vp->camif->camif_crop;
 146         int source_x = camif_crop->width;
 147         int source_y = camif_crop->height;
 148         int target_x = vp->out_frame.rect.width;
 149         int target_y = vp->out_frame.rect.height;
 150         int ret;
 151
 152         if (vp->rotation == 90 || vp->rotation == 270)
 153                 swap(target_x, target_y);
 154
 155         ret = camif_get_scaler_factor(source_x, target_x, &scaler->pre_h_ratio,
 156                                       &scaler->h_shift);
 157         if (ret < 0)
 158                 return ret;
 159
 160         ret = camif_get_scaler_factor(source_y, target_y, &scaler->pre_v_ratio,
 161                                       &scaler->v_shift);
 162         if (ret < 0)
 163                 return ret;
 164
 165         scaler->pre_dst_width = source_x / scaler->pre_h_ratio;
 166         scaler->pre_dst_height = source_y / scaler->pre_v_ratio;
 167
 168         scaler->main_h_ratio = (source_x << 8) / (target_x << scaler->h_shift);
 169         scaler->main_v_ratio = (source_y << 8) / (target_y << scaler->v_shift);
 170
 171         scaler->scaleup_h = (target_x >= source_x);
 172         scaler->scaleup_v = (target_y >= source_y);
 173
 174         scaler->copy = 0;
 175
 176         pr_debug("H: ratio: %u, shift: %u. V: ratio: %u, shift: %u.\n",
 177                  scaler->pre_h_ratio, scaler->h_shift,
 178                  scaler->pre_v_ratio, scaler->v_shift);
 179
 180         pr_debug("Source: %dx%d, Target: %dx%d, scaleup_h/v: %d/%d\n",
 181                  source_x, source_y, target_x, target_y,
 182                  scaler->scaleup_h, scaler->scaleup_v);
 183
 184         return 0;
 185 }
 186
 187 static int camif_register_sensor(struct camif_dev *camif)
 188 {
 189         struct s3c_camif_sensor_info *sensor = &camif->pdata.sensor;
 190         struct v4l2_device *v4l2_dev = &camif->v4l2_dev;
 191         struct i2c_adapter *adapter;
 192         struct v4l2_subdev_format format;
 193         struct v4l2_subdev *sd;
 194         int ret;
 195
 196         camif->sensor.sd = NULL;
 197
 198         if (sensor->i2c_board_info.addr == 0)
 199                 return -EINVAL;
 200
 201         adapter = i2c_get_adapter(sensor->i2c_bus_num);
 202         if (adapter == NULL) {
 203                 v4l2_warn(v4l2_dev, "failed to get I2C adapter %d\n",
 204                           sensor->i2c_bus_num);
 205                 return -EPROBE_DEFER;
 206         }
 207
 208         sd = v4l2_i2c_new_subdev_board(v4l2_dev, adapter,
 209                                        &sensor->i2c_board_info, NULL);
 210         if (sd == NULL) {
 211                 i2c_put_adapter(adapter);
 212                 v4l2_warn(v4l2_dev, "failed to acquire subdev %s\n",
 213                           sensor->i2c_board_info.type);
 214                 return -EPROBE_DEFER;
 215         }
 216         camif->sensor.sd = sd;
 217
 218         v4l2_info(v4l2_dev, "registered sensor subdevice %s\n", sd->name);
 219
 220         /* Get initial pixel format and set it at the camif sink pad */
 221         format.pad = 0;
 222         format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 223         ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &format);
 224
 225         if (ret < 0)
 226                 return 0;
 227
 228         format.pad = CAMIF_SD_PAD_SINK;
 229         v4l2_subdev_call(&camif->subdev, pad, set_fmt, NULL, &format);
 230
 231         v4l2_info(sd, "Initial format from sensor: %dx%d, %#x\n",
 232                   format.format.width, format.format.height,
 233                   format.format.code);
 234         return 0;
 235 }
 236
 237 static void camif_unregister_sensor(struct camif_dev *camif)
 238 {
 239         struct v4l2_subdev *sd = camif->sensor.sd;
 240         struct i2c_client *client = sd ? v4l2_get_subdevdata(sd) : NULL;
 241         struct i2c_adapter *adapter;
 242
 243         if (client == NULL)
 244                 return;
 245
 246         adapter = client->adapter;
 247         v4l2_device_unregister_subdev(sd);
 248         camif->sensor.sd = NULL;
 249         i2c_unregister_device(client);
 250         i2c_put_adapter(adapter);
 251 }
 252
 253 static int camif_create_media_links(struct camif_dev *camif)
 254 {
 255         int i, ret;
 256
 257         ret = media_create_pad_link(&camif->sensor.sd->entity, 0,
 258                                 &camif->subdev.entity, CAMIF_SD_PAD_SINK,
 259                                 MEDIA_LNK_FL_IMMUTABLE |
 260                                 MEDIA_LNK_FL_ENABLED);
 261         if (ret)
 262                 return ret;
 263
 264         for (i = 1; i < CAMIF_SD_PADS_NUM && !ret; i++) {
 265                 ret = media_create_pad_link(&camif->subdev.entity, i,
 266                                 &camif->vp[i - 1].vdev.entity, 0,
 267                                 MEDIA_LNK_FL_IMMUTABLE |
 268                                 MEDIA_LNK_FL_ENABLED);
 269         }
 270
 271         return ret;
 272 }
 273
 274 static int camif_register_video_nodes(struct camif_dev *camif)
 275 {
 276         int ret = s3c_camif_register_video_node(camif, VP_CODEC);
 277         if (ret < 0)
 278                 return ret;
 279
 280         return s3c_camif_register_video_node(camif, VP_PREVIEW);
 281 }
 282
 283 static void camif_unregister_video_nodes(struct camif_dev *camif)
 284 {
 285         s3c_camif_unregister_video_node(camif, VP_CODEC);
 286         s3c_camif_unregister_video_node(camif, VP_PREVIEW);
 287 }
 288
 289 static void camif_unregister_media_entities(struct camif_dev *camif)
 290 {
 291         camif_unregister_video_nodes(camif);
 292         camif_unregister_sensor(camif);
 293         s3c_camif_unregister_subdev(camif);
 294 }
 295
 296 /*
 297  * Media device
 298  */
 299 static int camif_media_dev_init(struct camif_dev *camif)
 300 {
 301         struct media_device *md = &camif->media_dev;
 302         struct v4l2_device *v4l2_dev = &camif->v4l2_dev;
 303         unsigned int ip_rev = camif->variant->ip_revision;
 304         int ret;
 305
 306         memset(md, 0, sizeof(*md));
 307         snprintf(md->model, sizeof(md->model), "SAMSUNG S3C%s CAMIF",
 308                  ip_rev == S3C6410_CAMIF_IP_REV ? "6410" : "244X");
 309         strscpy(md->bus_info, "platform", sizeof(md->bus_info));
 310         md->hw_revision = ip_rev;
 311
 312         md->dev = camif->dev;
 313
 314         strscpy(v4l2_dev->name, "s3c-camif", sizeof(v4l2_dev->name));
 315         v4l2_dev->mdev = md;
 316
 317         media_device_init(md);
 318
 319         ret = v4l2_device_register(camif->dev, v4l2_dev);
 320         if (ret < 0)
 321                 return ret;
 322
 323         return ret;
 324 }
 325
 326 static void camif_clk_put(struct camif_dev *camif)
 327 {
 328         int i;
 329
 330         for (i = 0; i < CLK_MAX_NUM; i++) {
 331                 if (IS_ERR(camif->clock[i]))
 332                         continue;
 333                 clk_unprepare(camif->clock[i]);
 334                 clk_put(camif->clock[i]);
 335                 camif->clock[i] = ERR_PTR(-EINVAL);
 336         }
 337 }
 338
 339 static int camif_clk_get(struct camif_dev *camif)
 340 {
 341         int ret, i;
 342
 343         for (i = 1; i < CLK_MAX_NUM; i++)
 344                 camif->clock[i] = ERR_PTR(-EINVAL);
 345
 346         for (i = 0; i < CLK_MAX_NUM; i++) {
 347                 camif->clock[i] = clk_get(camif->dev, camif_clocks[i]);
 348                 if (IS_ERR(camif->clock[i])) {
 349                         ret = PTR_ERR(camif->clock[i]);
 350                         goto err;
 351                 }
 352                 ret = clk_prepare(camif->clock[i]);
 353                 if (ret < 0) {
 354                         clk_put(camif->clock[i]);
 355                         camif->clock[i] = NULL;
 356                         goto err;
 357                 }
 358         }
 359         return 0;
 360 err:
 361         camif_clk_put(camif);
 362         dev_err(camif->dev, "failed to get clock: %s\n",
 363                 camif_clocks[i]);
 364         return ret;
 365 }
 366
 367 /*
 368  * The CAMIF device has two relatively independent data processing paths
 369  * that can source data from memory or the common camera input frontend.
 370  * Register interrupts for each data processing path (camif_vp).
 371  */
 372 static int camif_request_irqs(struct platform_device *pdev,
 373                               struct camif_dev *camif)
 374 {
 375         int irq, ret, i;
 376
 377         for (i = 0; i < CAMIF_VP_NUM; i++) {
 378                 struct camif_vp *vp = &camif->vp[i];
 379
 380                 init_waitqueue_head(&vp->irq_queue);
 381
 382                 irq = platform_get_irq(pdev, i);
 383                 if (irq <= 0)
 384                         return -ENXIO;
 385
 386                 ret = devm_request_irq(&pdev->dev, irq, s3c_camif_irq_handler,
 387                                        0, dev_name(&pdev->dev), vp);
 388                 if (ret < 0) {
 389                         dev_err(&pdev->dev, "failed to install IRQ: %d\n", ret);
 390                         break;
 391                 }
 392         }
 393
 394         return ret;
 395 }
 396
 397 static int s3c_camif_probe(struct platform_device *pdev)
 398 {
 399         struct device *dev = &pdev->dev;
 400         struct s3c_camif_plat_data *pdata = dev->platform_data;
 401         struct s3c_camif_drvdata *drvdata;
 402         struct camif_dev *camif;
 403         struct resource *mres;
 404         int ret = 0;
 405
 406         camif = devm_kzalloc(dev, sizeof(*camif), GFP_KERNEL);
 407         if (!camif)
 408                 return -ENOMEM;
 409
 410         spin_lock_init(&camif->slock);
 411         mutex_init(&camif->lock);
 412
 413         camif->dev = dev;
 414
 415         if (!pdata || !pdata->gpio_get || !pdata->gpio_put) {
 416                 dev_err(dev, "wrong platform data\n");
 417                 return -EINVAL;
 418         }
 419
 420         camif->pdata = *pdata;
 421         drvdata = (void *)platform_get_device_id(pdev)->driver_data;
 422         camif->variant = drvdata->variant;
 423
 424         mres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 425
 426         camif->io_base = devm_ioremap_resource(dev, mres);
 427         if (IS_ERR(camif->io_base))
 428                 return PTR_ERR(camif->io_base);
 429
 430         ret = camif_request_irqs(pdev, camif);
 431         if (ret < 0)
 432                 return ret;
 433
 434         ret = pdata->gpio_get();
 435         if (ret < 0)
 436                 return ret;
 437
 438         ret = s3c_camif_create_subdev(camif);
 439         if (ret < 0)
 440                 goto err_sd;
 441
 442         ret = camif_clk_get(camif);
 443         if (ret < 0)
 444                 goto err_clk;
 445
 446         platform_set_drvdata(pdev, camif);
 447         clk_set_rate(camif->clock[CLK_CAM],
 448                         camif->pdata.sensor.clock_frequency);
 449
 450         dev_info(dev, "sensor clock frequency: %lu\n",
 451                  clk_get_rate(camif->clock[CLK_CAM]));
 452         /*
 453          * Set initial pixel format, resolution and crop rectangle.
 454          * Must be done before a sensor subdev is registered as some
 455          * settings are overrode with values from sensor subdev.
 456          */
 457         s3c_camif_set_defaults(camif);
 458
 459         pm_runtime_enable(dev);
 460
 461         ret = pm_runtime_get_sync(dev);
 462         if (ret < 0)
 463                 goto err_pm;
 464
 465         ret = camif_media_dev_init(camif);
 466         if (ret < 0)
 467                 goto err_alloc;
 468
 469         ret = camif_register_sensor(camif);
 470         if (ret < 0)
 471                 goto err_sens;
 472
 473         ret = v4l2_device_register_subdev(&camif->v4l2_dev, &camif->subdev);
 474         if (ret < 0)
 475                 goto err_sens;
 476
 477         ret = v4l2_device_register_subdev_nodes(&camif->v4l2_dev);
 478         if (ret < 0)
 479                 goto err_sens;
 480
 481         ret = camif_register_video_nodes(camif);
 482         if (ret < 0)
 483                 goto err_sens;
 484
 485         ret = camif_create_media_links(camif);
 486         if (ret < 0)
 487                 goto err_sens;
 488
 489         ret = media_device_register(&camif->media_dev);
 490         if (ret < 0)
 491                 goto err_sens;
 492
 493         pm_runtime_put(dev);
 494         return 0;
 495
 496 err_sens:
 497         v4l2_device_unregister(&camif->v4l2_dev);
 498         media_device_unregister(&camif->media_dev);
 499         media_device_cleanup(&camif->media_dev);
 500         camif_unregister_media_entities(camif);
 501 err_alloc:
 502         pm_runtime_put(dev);
 503         pm_runtime_disable(dev);
 504 err_pm:
 505         camif_clk_put(camif);
 506 err_clk:
 507         s3c_camif_unregister_subdev(camif);
 508 err_sd:
 509         pdata->gpio_put();
 510         return ret;
 511 }
 512
 513 static int s3c_camif_remove(struct platform_device *pdev)
 514 {
 515         struct camif_dev *camif = platform_get_drvdata(pdev);
 516         struct s3c_camif_plat_data *pdata = &camif->pdata;
 517
 518         media_device_unregister(&camif->media_dev);
 519         media_device_cleanup(&camif->media_dev);
 520         camif_unregister_media_entities(camif);
 521         v4l2_device_unregister(&camif->v4l2_dev);
 522
 523         pm_runtime_disable(&pdev->dev);
 524         camif_clk_put(camif);
 525         pdata->gpio_put();
 526
 527         return 0;
 528 }
 529
 530 static int s3c_camif_runtime_resume(struct device *dev)
 531 {
 532         struct camif_dev *camif = dev_get_drvdata(dev);
 533
 534         clk_enable(camif->clock[CLK_GATE]);
 535         /* null op on s3c244x */
 536         clk_enable(camif->clock[CLK_CAM]);
 537         return 0;
 538 }
 539
 540 static int s3c_camif_runtime_suspend(struct device *dev)
 541 {
 542         struct camif_dev *camif = dev_get_drvdata(dev);
 543
 544         /* null op on s3c244x */
 545         clk_disable(camif->clock[CLK_CAM]);
 546
 547         clk_disable(camif->clock[CLK_GATE]);
 548         return 0;
 549 }
 550
 551 static const struct s3c_camif_variant s3c244x_camif_variant = {
 552         .vp_pix_limits = {
 553                 [VP_CODEC] = {
 554                         .max_out_width          = 4096,
 555                         .max_sc_out_width       = 2048,
 556                         .out_width_align        = 16,
 557                         .min_out_width          = 16,
 558                         .max_height             = 4096,
 559                 },
 560                 [VP_PREVIEW] = {
 561                         .max_out_width          = 640,
 562                         .max_sc_out_width       = 640,
 563                         .out_width_align        = 16,
 564                         .min_out_width          = 16,
 565                         .max_height             = 480,
 566                 }
 567         },
 568         .pix_limits = {
 569                 .win_hor_offset_align   = 8,
 570         },
 571         .ip_revision = S3C244X_CAMIF_IP_REV,
 572 };
 573
 574 static struct s3c_camif_drvdata s3c244x_camif_drvdata = {
 575         .variant        = &s3c244x_camif_variant,
 576         .bus_clk_freq   = 24000000UL,
 577 };
 578
 579 static const struct s3c_camif_variant s3c6410_camif_variant = {
 580         .vp_pix_limits = {
 581                 [VP_CODEC] = {
 582                         .max_out_width          = 4096,
 583                         .max_sc_out_width       = 2048,
 584                         .out_width_align        = 16,
 585                         .min_out_width          = 16,
 586                         .max_height             = 4096,
 587                 },
 588                 [VP_PREVIEW] = {
 589                         .max_out_width          = 4096,
 590                         .max_sc_out_width       = 720,
 591                         .out_width_align        = 16,
 592                         .min_out_width          = 16,
 593                         .max_height             = 4096,
 594                 }
 595         },
 596         .pix_limits = {
 597                 .win_hor_offset_align   = 8,
 598         },
 599         .ip_revision = S3C6410_CAMIF_IP_REV,
 600         .has_img_effect = 1,
 601         .vp_offset = 0x20,
 602 };
 603
 604 static struct s3c_camif_drvdata s3c6410_camif_drvdata = {
 605         .variant        = &s3c6410_camif_variant,
 606         .bus_clk_freq   = 133000000UL,
 607 };
 608
 609 static const struct platform_device_id s3c_camif_driver_ids[] = {
 610         {
 611                 .name           = "s3c2440-camif",
 612                 .driver_data    = (unsigned long)&s3c244x_camif_drvdata,
 613         }, {
 614                 .name           = "s3c6410-camif",
 615                 .driver_data    = (unsigned long)&s3c6410_camif_drvdata,
 616         },
 617         { /* sentinel */ },
 618 };
 619 MODULE_DEVICE_TABLE(platform, s3c_camif_driver_ids);
 620
 621 static const struct dev_pm_ops s3c_camif_pm_ops = {
 622         .runtime_suspend        = s3c_camif_runtime_suspend,
 623         .runtime_resume         = s3c_camif_runtime_resume,
 624 };
 625
 626 static struct platform_driver s3c_camif_driver = {
 627         .probe          = s3c_camif_probe,
 628         .remove         = s3c_camif_remove,
 629         .id_table       = s3c_camif_driver_ids,
 630         .driver = {
 631                 .name   = S3C_CAMIF_DRIVER_NAME,
 632                 .pm     = &s3c_camif_pm_ops,
 633         }
 634 };
 635
 636 module_platform_driver(s3c_camif_driver);
 637
 638 MODULE_AUTHOR("Sylwester Nawrocki <sylvester.nawrocki@gmail.com>");
 639 MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
 640 MODULE_DESCRIPTION("S3C24XX/S3C64XX SoC camera interface driver");
 641 MODULE_LICENSE("GPL");