drivers/media/platform/stm32/stm32-dcmi.c

   1 /*
   2  * Driver for STM32 Digital Camera Memory Interface
   3  *
   4  * Copyright (C) STMicroelectronics SA 2017
   5  * Authors: Yannick Fertre <yannick.fertre@st.com>
   6  *          Hugues Fruchet <hugues.fruchet@st.com>
   7  *          for STMicroelectronics.
   8  * License terms:  GNU General Public License (GPL), version 2
   9  *
  10  * This driver is based on atmel_isi.c
  11  *
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/completion.h>
  16 #include <linux/delay.h>
  17 #include <linux/dmaengine.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_graph.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/reset.h>
  27 #include <linux/videodev2.h>
  28
  29 #include <media/v4l2-ctrls.h>
  30 #include <media/v4l2-dev.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-event.h>
  33 #include <media/v4l2-fwnode.h>
  34 #include <media/v4l2-image-sizes.h>
  35 #include <media/v4l2-ioctl.h>
  36 #include <media/v4l2-rect.h>
  37 #include <media/videobuf2-dma-contig.h>
  38
  39 #define DRV_NAME "stm32-dcmi"
  40
  41 /* Registers offset for DCMI */
  42 #define DCMI_CR         0x00 /* Control Register */
  43 #define DCMI_SR         0x04 /* Status Register */
  44 #define DCMI_RIS        0x08 /* Raw Interrupt Status register */
  45 #define DCMI_IER        0x0C /* Interrupt Enable Register */
  46 #define DCMI_MIS        0x10 /* Masked Interrupt Status register */
  47 #define DCMI_ICR        0x14 /* Interrupt Clear Register */
  48 #define DCMI_ESCR       0x18 /* Embedded Synchronization Code Register */
  49 #define DCMI_ESUR       0x1C /* Embedded Synchronization Unmask Register */
  50 #define DCMI_CWSTRT     0x20 /* Crop Window STaRT */
  51 #define DCMI_CWSIZE     0x24 /* Crop Window SIZE */
  52 #define DCMI_DR         0x28 /* Data Register */
  53 #define DCMI_IDR        0x2C /* IDentifier Register */
  54
  55 /* Bits definition for control register (DCMI_CR) */
  56 #define CR_CAPTURE      BIT(0)
  57 #define CR_CM           BIT(1)
  58 #define CR_CROP         BIT(2)
  59 #define CR_JPEG         BIT(3)
  60 #define CR_ESS          BIT(4)
  61 #define CR_PCKPOL       BIT(5)
  62 #define CR_HSPOL        BIT(6)
  63 #define CR_VSPOL        BIT(7)
  64 #define CR_FCRC_0       BIT(8)
  65 #define CR_FCRC_1       BIT(9)
  66 #define CR_EDM_0        BIT(10)
  67 #define CR_EDM_1        BIT(11)
  68 #define CR_ENABLE       BIT(14)
  69
  70 /* Bits definition for status register (DCMI_SR) */
  71 #define SR_HSYNC        BIT(0)
  72 #define SR_VSYNC        BIT(1)
  73 #define SR_FNE          BIT(2)
  74
  75 /*
  76  * Bits definition for interrupt registers
  77  * (DCMI_RIS, DCMI_IER, DCMI_MIS, DCMI_ICR)
  78  */
  79 #define IT_FRAME        BIT(0)
  80 #define IT_OVR          BIT(1)
  81 #define IT_ERR          BIT(2)
  82 #define IT_VSYNC        BIT(3)
  83 #define IT_LINE         BIT(4)
  84
  85 enum state {
  86         STOPPED = 0,
  87         RUNNING,
  88         STOPPING,
  89 };
  90
  91 #define MIN_WIDTH       16U
  92 #define MAX_WIDTH       2048U
  93 #define MIN_HEIGHT      16U
  94 #define MAX_HEIGHT      2048U
  95
  96 #define TIMEOUT_MS      1000
  97
  98 struct dcmi_graph_entity {
  99         struct device_node *node;
 100
 101         struct v4l2_async_subdev asd;
 102         struct v4l2_subdev *subdev;
 103 };
 104
 105 struct dcmi_format {
 106         u32     fourcc;
 107         u32     mbus_code;
 108         u8      bpp;
 109 };
 110
 111 struct dcmi_framesize {
 112         u32     width;
 113         u32     height;
 114 };
 115
 116 struct dcmi_buf {
 117         struct vb2_v4l2_buffer  vb;
 118         bool                    prepared;
 119         dma_addr_t              paddr;
 120         size_t                  size;
 121         struct list_head        list;
 122 };
 123
 124 struct stm32_dcmi {
 125         /* Protects the access of variables shared within the interrupt */
 126         spinlock_t                      irqlock;
 127         struct device                   *dev;
 128         void __iomem                    *regs;
 129         struct resource                 *res;
 130         struct reset_control            *rstc;
 131         int                             sequence;
 132         struct list_head                buffers;
 133         struct dcmi_buf                 *active;
 134
 135         struct v4l2_device              v4l2_dev;
 136         struct video_device             *vdev;
 137         struct v4l2_async_notifier      notifier;
 138         struct dcmi_graph_entity        entity;
 139         struct v4l2_format              fmt;
 140         struct v4l2_rect                crop;
 141         bool                            do_crop;
 142
 143         const struct dcmi_format        **sd_formats;
 144         unsigned int                    num_of_sd_formats;
 145         const struct dcmi_format        *sd_format;
 146         struct dcmi_framesize           *sd_framesizes;
 147         unsigned int                    num_of_sd_framesizes;
 148         struct dcmi_framesize           sd_framesize;
 149         struct v4l2_rect                sd_bounds;
 150
 151         /* Protect this data structure */
 152         struct mutex                    lock;
 153         struct vb2_queue                queue;
 154
 155         struct v4l2_fwnode_bus_parallel bus;
 156         struct completion               complete;
 157         struct clk                      *mclk;
 158         enum state                      state;
 159         struct dma_chan                 *dma_chan;
 160         dma_cookie_t                    dma_cookie;
 161         u32                             misr;
 162         int                             errors_count;
 163         int                             buffers_count;
 164
 165         /* Ensure DMA operations atomicity */
 166         struct mutex                    dma_lock;
 167 };
 168
 169 static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
 170 {
 171         return container_of(n, struct stm32_dcmi, notifier);
 172 }
 173
 174 static inline u32 reg_read(void __iomem *base, u32 reg)
 175 {
 176         return readl_relaxed(base + reg);
 177 }
 178
 179 static inline void reg_write(void __iomem *base, u32 reg, u32 val)
 180 {
 181         writel_relaxed(val, base + reg);
 182 }
 183
 184 static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
 185 {
 186         reg_write(base, reg, reg_read(base, reg) | mask);
 187 }
 188
 189 static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
 190 {
 191         reg_write(base, reg, reg_read(base, reg) & ~mask);
 192 }
 193
 194 static int dcmi_start_capture(struct stm32_dcmi *dcmi);
 195
 196 static void dcmi_dma_callback(void *param)
 197 {
 198         struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
 199         struct dma_chan *chan = dcmi->dma_chan;
 200         struct dma_tx_state state;
 201         enum dma_status status;
 202
 203         spin_lock(&dcmi->irqlock);
 204
 205         /* Check DMA status */
 206         status = dmaengine_tx_status(chan, dcmi->dma_cookie, &state);
 207
 208         switch (status) {
 209         case DMA_IN_PROGRESS:
 210                 dev_dbg(dcmi->dev, "%s: Received DMA_IN_PROGRESS\n", __func__);
 211                 break;
 212         case DMA_PAUSED:
 213                 dev_err(dcmi->dev, "%s: Received DMA_PAUSED\n", __func__);
 214                 break;
 215         case DMA_ERROR:
 216                 dev_err(dcmi->dev, "%s: Received DMA_ERROR\n", __func__);
 217                 break;
 218         case DMA_COMPLETE:
 219                 dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
 220
 221                 if (dcmi->active) {
 222                         struct dcmi_buf *buf = dcmi->active;
 223                         struct vb2_v4l2_buffer *vbuf = &dcmi->active->vb;
 224
 225                         vbuf->sequence = dcmi->sequence++;
 226                         vbuf->field = V4L2_FIELD_NONE;
 227                         vbuf->vb2_buf.timestamp = ktime_get_ns();
 228                         vb2_set_plane_payload(&vbuf->vb2_buf, 0, buf->size);
 229                         vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
 230                         dev_dbg(dcmi->dev, "buffer[%d] done seq=%d\n",
 231                                 vbuf->vb2_buf.index, vbuf->sequence);
 232
 233                         dcmi->buffers_count++;
 234                         dcmi->active = NULL;
 235                 }
 236
 237                 /* Restart a new DMA transfer with next buffer */
 238                 if (dcmi->state == RUNNING) {
 239                         if (list_empty(&dcmi->buffers)) {
 240                                 dev_err(dcmi->dev, "%s: No more buffer queued, cannot capture buffer",
 241                                         __func__);
 242                                 dcmi->errors_count++;
 243                                 dcmi->active = NULL;
 244
 245                                 spin_unlock(&dcmi->irqlock);
 246                                 return;
 247                         }
 248
 249                         dcmi->active = list_entry(dcmi->buffers.next,
 250                                                   struct dcmi_buf, list);
 251
 252                         list_del_init(&dcmi->active->list);
 253
 254                         if (dcmi_start_capture(dcmi)) {
 255                                 dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete",
 256                                         __func__);
 257
 258                                 spin_unlock(&dcmi->irqlock);
 259                                 return;
 260                         }
 261
 262                         /* Enable capture */
 263                         reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
 264                 }
 265
 266                 break;
 267         default:
 268                 dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
 269                 break;
 270         }
 271
 272         spin_unlock(&dcmi->irqlock);
 273 }
 274
 275 static int dcmi_start_dma(struct stm32_dcmi *dcmi,
 276                           struct dcmi_buf *buf)
 277 {
 278         struct dma_async_tx_descriptor *desc = NULL;
 279         struct dma_slave_config config;
 280         int ret;
 281
 282         memset(&config, 0, sizeof(config));
 283
 284         config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
 285         config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 286         config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 287         config.dst_maxburst = 4;
 288
 289         /* Configure DMA channel */
 290         ret = dmaengine_slave_config(dcmi->dma_chan, &config);
 291         if (ret < 0) {
 292                 dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
 293                         __func__, ret);
 294                 return ret;
 295         }
 296
 297         /*
 298          * Avoid call of dmaengine_terminate_all() between
 299          * dmaengine_prep_slave_single() and dmaengine_submit()
 300          * by locking the whole DMA submission sequence
 301          */
 302         mutex_lock(&dcmi->dma_lock);
 303
 304         /* Prepare a DMA transaction */
 305         desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
 306                                            buf->size,
 307                                            DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
 308         if (!desc) {
 309                 dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer size %zu\n",
 310                         __func__, buf->size);
 311                 mutex_unlock(&dcmi->dma_lock);
 312                 return -EINVAL;
 313         }
 314
 315         /* Set completion callback routine for notification */
 316         desc->callback = dcmi_dma_callback;
 317         desc->callback_param = dcmi;
 318
 319         /* Push current DMA transaction in the pending queue */
 320         dcmi->dma_cookie = dmaengine_submit(desc);
 321         if (dma_submit_error(dcmi->dma_cookie)) {
 322                 dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
 323                 mutex_unlock(&dcmi->dma_lock);
 324                 return -ENXIO;
 325         }
 326
 327         mutex_unlock(&dcmi->dma_lock);
 328
 329         dma_async_issue_pending(dcmi->dma_chan);
 330
 331         return 0;
 332 }
 333
 334 static int dcmi_start_capture(struct stm32_dcmi *dcmi)
 335 {
 336         int ret;
 337         struct dcmi_buf *buf = dcmi->active;
 338
 339         if (!buf)
 340                 return -EINVAL;
 341
 342         ret = dcmi_start_dma(dcmi, buf);
 343         if (ret) {
 344                 dcmi->errors_count++;
 345                 return ret;
 346         }
 347
 348         /* Enable capture */
 349         reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
 350
 351         return 0;
 352 }
 353
 354 static void dcmi_set_crop(struct stm32_dcmi *dcmi)
 355 {
 356         u32 size, start;
 357
 358         /* Crop resolution */
 359         size = ((dcmi->crop.height - 1) << 16) |
 360                 ((dcmi->crop.width << 1) - 1);
 361         reg_write(dcmi->regs, DCMI_CWSIZE, size);
 362
 363         /* Crop start point */
 364         start = ((dcmi->crop.top) << 16) |
 365                  ((dcmi->crop.left << 1));
 366         reg_write(dcmi->regs, DCMI_CWSTRT, start);
 367
 368         dev_dbg(dcmi->dev, "Cropping to %ux%u@%u:%u\n",
 369                 dcmi->crop.width, dcmi->crop.height,
 370                 dcmi->crop.left, dcmi->crop.top);
 371
 372         /* Enable crop */
 373         reg_set(dcmi->regs, DCMI_CR, CR_CROP);
 374 }
 375
 376 static irqreturn_t dcmi_irq_thread(int irq, void *arg)
 377 {
 378         struct stm32_dcmi *dcmi = arg;
 379
 380         spin_lock(&dcmi->irqlock);
 381
 382         /* Stop capture is required */
 383         if (dcmi->state == STOPPING) {
 384                 reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 385
 386                 dcmi->state = STOPPED;
 387
 388                 complete(&dcmi->complete);
 389
 390                 spin_unlock(&dcmi->irqlock);
 391                 return IRQ_HANDLED;
 392         }
 393
 394         if ((dcmi->misr & IT_OVR) || (dcmi->misr & IT_ERR)) {
 395                 /*
 396                  * An overflow or an error has been detected,
 397                  * stop current DMA transfert & restart it
 398                  */
 399                 dev_warn(dcmi->dev, "%s: Overflow or error detected\n",
 400                          __func__);
 401
 402                 dcmi->errors_count++;
 403                 dmaengine_terminate_all(dcmi->dma_chan);
 404
 405                 reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
 406
 407                 dev_dbg(dcmi->dev, "Restarting capture after DCMI error\n");
 408
 409                 if (dcmi_start_capture(dcmi)) {
 410                         dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
 411                                 __func__);
 412
 413                         spin_unlock(&dcmi->irqlock);
 414                         return IRQ_HANDLED;
 415                 }
 416         }
 417
 418         spin_unlock(&dcmi->irqlock);
 419         return IRQ_HANDLED;
 420 }
 421
 422 static irqreturn_t dcmi_irq_callback(int irq, void *arg)
 423 {
 424         struct stm32_dcmi *dcmi = arg;
 425
 426         spin_lock(&dcmi->irqlock);
 427
 428         dcmi->misr = reg_read(dcmi->regs, DCMI_MIS);
 429
 430         /* Clear interrupt */
 431         reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
 432
 433         spin_unlock(&dcmi->irqlock);
 434
 435         return IRQ_WAKE_THREAD;
 436 }
 437
 438 static int dcmi_queue_setup(struct vb2_queue *vq,
 439                             unsigned int *nbuffers,
 440                             unsigned int *nplanes,
 441                             unsigned int sizes[],
 442                             struct device *alloc_devs[])
 443 {
 444         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 445         unsigned int size;
 446
 447         size = dcmi->fmt.fmt.pix.sizeimage;
 448
 449         /* Make sure the image size is large enough */
 450         if (*nplanes)
 451                 return sizes[0] < size ? -EINVAL : 0;
 452
 453         *nplanes = 1;
 454         sizes[0] = size;
 455
 456         dcmi->active = NULL;
 457
 458         dev_dbg(dcmi->dev, "Setup queue, count=%d, size=%d\n",
 459                 *nbuffers, size);
 460
 461         return 0;
 462 }
 463
 464 static int dcmi_buf_init(struct vb2_buffer *vb)
 465 {
 466         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 467         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 468
 469         INIT_LIST_HEAD(&buf->list);
 470
 471         return 0;
 472 }
 473
 474 static int dcmi_buf_prepare(struct vb2_buffer *vb)
 475 {
 476         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 477         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 478         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 479         unsigned long size;
 480
 481         size = dcmi->fmt.fmt.pix.sizeimage;
 482
 483         if (vb2_plane_size(vb, 0) < size) {
 484                 dev_err(dcmi->dev, "%s data will not fit into plane (%lu < %lu)\n",
 485                         __func__, vb2_plane_size(vb, 0), size);
 486                 return -EINVAL;
 487         }
 488
 489         vb2_set_plane_payload(vb, 0, size);
 490
 491         if (!buf->prepared) {
 492                 /* Get memory addresses */
 493                 buf->paddr =
 494                         vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
 495                 buf->size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 496                 buf->prepared = true;
 497
 498                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->size);
 499
 500                 dev_dbg(dcmi->dev, "buffer[%d] phy=0x%pad size=%zu\n",
 501                         vb->index, &buf->paddr, buf->size);
 502         }
 503
 504         return 0;
 505 }
 506
 507 static void dcmi_buf_queue(struct vb2_buffer *vb)
 508 {
 509         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 510         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 511         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 512         unsigned long flags = 0;
 513
 514         spin_lock_irqsave(&dcmi->irqlock, flags);
 515
 516         if ((dcmi->state == RUNNING) && (!dcmi->active)) {
 517                 dcmi->active = buf;
 518
 519                 dev_dbg(dcmi->dev, "Starting capture on buffer[%d] queued\n",
 520                         buf->vb.vb2_buf.index);
 521
 522                 if (dcmi_start_capture(dcmi)) {
 523                         dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
 524                                 __func__);
 525
 526                         spin_unlock_irqrestore(&dcmi->irqlock, flags);
 527                         return;
 528                 }
 529         } else {
 530                 /* Enqueue to video buffers list */
 531                 list_add_tail(&buf->list, &dcmi->buffers);
 532         }
 533
 534         spin_unlock_irqrestore(&dcmi->irqlock, flags);
 535 }
 536
 537 static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 538 {
 539         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 540         struct dcmi_buf *buf, *node;
 541         u32 val = 0;
 542         int ret;
 543
 544         ret = clk_enable(dcmi->mclk);
 545         if (ret) {
 546                 dev_err(dcmi->dev, "%s: Failed to start streaming, cannot enable clock",
 547                         __func__);
 548                 goto err_release_buffers;
 549         }
 550
 551         /* Enable stream on the sub device */
 552         ret = v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 1);
 553         if (ret && ret != -ENOIOCTLCMD) {
 554                 dev_err(dcmi->dev, "%s: Failed to start streaming, subdev streamon error",
 555                         __func__);
 556                 goto err_disable_clock;
 557         }
 558
 559         spin_lock_irq(&dcmi->irqlock);
 560
 561         /* Set bus width */
 562         switch (dcmi->bus.bus_width) {
 563         case 14:
 564                 val |= CR_EDM_0 | CR_EDM_1;
 565                 break;
 566         case 12:
 567                 val |= CR_EDM_1;
 568                 break;
 569         case 10:
 570                 val |= CR_EDM_0;
 571                 break;
 572         default:
 573                 /* Set bus width to 8 bits by default */
 574                 break;
 575         }
 576
 577         /* Set vertical synchronization polarity */
 578         if (dcmi->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 579                 val |= CR_VSPOL;
 580
 581         /* Set horizontal synchronization polarity */
 582         if (dcmi->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 583                 val |= CR_HSPOL;
 584
 585         /* Set pixel clock polarity */
 586         if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 587                 val |= CR_PCKPOL;
 588
 589         reg_write(dcmi->regs, DCMI_CR, val);
 590
 591         /* Set crop */
 592         if (dcmi->do_crop)
 593                 dcmi_set_crop(dcmi);
 594
 595         /* Enable dcmi */
 596         reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
 597
 598         dcmi->state = RUNNING;
 599
 600         dcmi->sequence = 0;
 601         dcmi->errors_count = 0;
 602         dcmi->buffers_count = 0;
 603         dcmi->active = NULL;
 604
 605         /*
 606          * Start transfer if at least one buffer has been queued,
 607          * otherwise transfer is deferred at buffer queueing
 608          */
 609         if (list_empty(&dcmi->buffers)) {
 610                 dev_dbg(dcmi->dev, "Start streaming is deferred to next buffer queueing\n");
 611                 spin_unlock_irq(&dcmi->irqlock);
 612                 return 0;
 613         }
 614
 615         dcmi->active = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 616         list_del_init(&dcmi->active->list);
 617
 618         dev_dbg(dcmi->dev, "Start streaming, starting capture\n");
 619
 620         ret = dcmi_start_capture(dcmi);
 621         if (ret) {
 622                 dev_err(dcmi->dev, "%s: Start streaming failed, cannot start capture",
 623                         __func__);
 624
 625                 spin_unlock_irq(&dcmi->irqlock);
 626                 goto err_subdev_streamoff;
 627         }
 628
 629         /* Enable interruptions */
 630         reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 631
 632         spin_unlock_irq(&dcmi->irqlock);
 633
 634         return 0;
 635
 636 err_subdev_streamoff:
 637         v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 0);
 638
 639 err_disable_clock:
 640         clk_disable(dcmi->mclk);
 641
 642 err_release_buffers:
 643         spin_lock_irq(&dcmi->irqlock);
 644         /*
 645          * Return all buffers to vb2 in QUEUED state.
 646          * This will give ownership back to userspace
 647          */
 648         if (dcmi->active) {
 649                 buf = dcmi->active;
 650                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
 651                 dcmi->active = NULL;
 652         }
 653         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 654                 list_del_init(&buf->list);
 655                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
 656         }
 657         spin_unlock_irq(&dcmi->irqlock);
 658
 659         return ret;
 660 }
 661
 662 static void dcmi_stop_streaming(struct vb2_queue *vq)
 663 {
 664         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 665         struct dcmi_buf *buf, *node;
 666         unsigned long time_ms = msecs_to_jiffies(TIMEOUT_MS);
 667         long timeout;
 668         int ret;
 669
 670         /* Disable stream on the sub device */
 671         ret = v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 0);
 672         if (ret && ret != -ENOIOCTLCMD)
 673                 dev_err(dcmi->dev, "stream off failed in subdev\n");
 674
 675         dcmi->state = STOPPING;
 676
 677         timeout = wait_for_completion_interruptible_timeout(&dcmi->complete,
 678                                                             time_ms);
 679
 680         spin_lock_irq(&dcmi->irqlock);
 681
 682         /* Disable interruptions */
 683         reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 684
 685         /* Disable DCMI */
 686         reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
 687
 688         if (!timeout) {
 689                 dev_err(dcmi->dev, "Timeout during stop streaming\n");
 690                 dcmi->state = STOPPED;
 691         }
 692
 693         /* Return all queued buffers to vb2 in ERROR state */
 694         if (dcmi->active) {
 695                 buf = dcmi->active;
 696                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 697                 dcmi->active = NULL;
 698         }
 699         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 700                 list_del_init(&buf->list);
 701                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 702         }
 703
 704         spin_unlock_irq(&dcmi->irqlock);
 705
 706         /* Stop all pending DMA operations */
 707         mutex_lock(&dcmi->dma_lock);
 708         dmaengine_terminate_all(dcmi->dma_chan);
 709         mutex_unlock(&dcmi->dma_lock);
 710
 711         clk_disable(dcmi->mclk);
 712
 713         dev_dbg(dcmi->dev, "Stop streaming, errors=%d buffers=%d\n",
 714                 dcmi->errors_count, dcmi->buffers_count);
 715 }
 716
 717 static const struct vb2_ops dcmi_video_qops = {
 718         .queue_setup            = dcmi_queue_setup,
 719         .buf_init               = dcmi_buf_init,
 720         .buf_prepare            = dcmi_buf_prepare,
 721         .buf_queue              = dcmi_buf_queue,
 722         .start_streaming        = dcmi_start_streaming,
 723         .stop_streaming         = dcmi_stop_streaming,
 724         .wait_prepare           = vb2_ops_wait_prepare,
 725         .wait_finish            = vb2_ops_wait_finish,
 726 };
 727
 728 static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
 729                               struct v4l2_format *fmt)
 730 {
 731         struct stm32_dcmi *dcmi = video_drvdata(file);
 732
 733         *fmt = dcmi->fmt;
 734
 735         return 0;
 736 }
 737
 738 static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
 739                                                        unsigned int fourcc)
 740 {
 741         unsigned int num_formats = dcmi->num_of_sd_formats;
 742         const struct dcmi_format *fmt;
 743         unsigned int i;
 744
 745         for (i = 0; i < num_formats; i++) {
 746                 fmt = dcmi->sd_formats[i];
 747                 if (fmt->fourcc == fourcc)
 748                         return fmt;
 749         }
 750
 751         return NULL;
 752 }
 753
 754 static void __find_outer_frame_size(struct stm32_dcmi *dcmi,
 755                                     struct v4l2_pix_format *pix,
 756                                     struct dcmi_framesize *framesize)
 757 {
 758         struct dcmi_framesize *match = NULL;
 759         unsigned int i;
 760         unsigned int min_err = UINT_MAX;
 761
 762         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
 763                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
 764                 int w_err = (fsize->width - pix->width);
 765                 int h_err = (fsize->height - pix->height);
 766                 int err = w_err + h_err;
 767
 768                 if ((w_err >= 0) && (h_err >= 0) && (err < min_err)) {
 769                         min_err = err;
 770                         match = fsize;
 771                 }
 772         }
 773         if (!match)
 774                 match = &dcmi->sd_framesizes[0];
 775
 776         *framesize = *match;
 777 }
 778
 779 static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 780                         const struct dcmi_format **sd_format,
 781                         struct dcmi_framesize *sd_framesize)
 782 {
 783         const struct dcmi_format *sd_fmt;
 784         struct dcmi_framesize sd_fsize;
 785         struct v4l2_pix_format *pix = &f->fmt.pix;
 786         struct v4l2_subdev_pad_config pad_cfg;
 787         struct v4l2_subdev_format format = {
 788                 .which = V4L2_SUBDEV_FORMAT_TRY,
 789         };
 790         int ret;
 791
 792         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
 793         if (!sd_fmt) {
 794                 if (!dcmi->num_of_sd_formats)
 795                         return -ENODATA;
 796
 797                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
 798                 pix->pixelformat = sd_fmt->fourcc;
 799         }
 800
 801         /* Limit to hardware capabilities */
 802         pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
 803         pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
 804
 805         if (dcmi->do_crop && dcmi->num_of_sd_framesizes) {
 806                 struct dcmi_framesize outer_sd_fsize;
 807                 /*
 808                  * If crop is requested and sensor have discrete frame sizes,
 809                  * select the frame size that is just larger than request
 810                  */
 811                 __find_outer_frame_size(dcmi, pix, &outer_sd_fsize);
 812                 pix->width = outer_sd_fsize.width;
 813                 pix->height = outer_sd_fsize.height;
 814         }
 815
 816         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
 817         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, set_fmt,
 818                                &pad_cfg, &format);
 819         if (ret < 0)
 820                 return ret;
 821
 822         /* Update pix regarding to what sensor can do */
 823         v4l2_fill_pix_format(pix, &format.format);
 824
 825         /* Save resolution that sensor can actually do */
 826         sd_fsize.width = pix->width;
 827         sd_fsize.height = pix->height;
 828
 829         if (dcmi->do_crop) {
 830                 struct v4l2_rect c = dcmi->crop;
 831                 struct v4l2_rect max_rect;
 832
 833                 /*
 834                  * Adjust crop by making the intersection between
 835                  * format resolution request and crop request
 836                  */
 837                 max_rect.top = 0;
 838                 max_rect.left = 0;
 839                 max_rect.width = pix->width;
 840                 max_rect.height = pix->height;
 841                 v4l2_rect_map_inside(&c, &max_rect);
 842                 c.top  = clamp_t(s32, c.top, 0, pix->height - c.height);
 843                 c.left = clamp_t(s32, c.left, 0, pix->width - c.width);
 844                 dcmi->crop = c;
 845
 846                 /* Adjust format resolution request to crop */
 847                 pix->width = dcmi->crop.width;
 848                 pix->height = dcmi->crop.height;
 849         }
 850
 851         pix->field = V4L2_FIELD_NONE;
 852         pix->bytesperline = pix->width * sd_fmt->bpp;
 853         pix->sizeimage = pix->bytesperline * pix->height;
 854
 855         if (sd_format)
 856                 *sd_format = sd_fmt;
 857         if (sd_framesize)
 858                 *sd_framesize = sd_fsize;
 859
 860         return 0;
 861 }
 862
 863 static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
 864 {
 865         struct v4l2_subdev_format format = {
 866                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 867         };
 868         const struct dcmi_format *sd_format;
 869         struct dcmi_framesize sd_framesize;
 870         struct v4l2_mbus_framefmt *mf = &format.format;
 871         struct v4l2_pix_format *pix = &f->fmt.pix;
 872         int ret;
 873
 874         /*
 875          * Try format, fmt.width/height could have been changed
 876          * to match sensor capability or crop request
 877          * sd_format & sd_framesize will contain what subdev
 878          * can do for this request.
 879          */
 880         ret = dcmi_try_fmt(dcmi, f, &sd_format, &sd_framesize);
 881         if (ret)
 882                 return ret;
 883
 884         /* pix to mbus format */
 885         v4l2_fill_mbus_format(mf, pix,
 886                               sd_format->mbus_code);
 887         mf->width = sd_framesize.width;
 888         mf->height = sd_framesize.height;
 889
 890         ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
 891                                set_fmt, NULL, &format);
 892         if (ret < 0)
 893                 return ret;
 894
 895         dev_dbg(dcmi->dev, "Sensor format set to 0x%x %ux%u\n",
 896                 mf->code, mf->width, mf->height);
 897         dev_dbg(dcmi->dev, "Buffer format set to %4.4s %ux%u\n",
 898                 (char *)&pix->pixelformat,
 899                 pix->width, pix->height);
 900
 901         dcmi->fmt = *f;
 902         dcmi->sd_format = sd_format;
 903         dcmi->sd_framesize = sd_framesize;
 904
 905         return 0;
 906 }
 907
 908 static int dcmi_s_fmt_vid_cap(struct file *file, void *priv,
 909                               struct v4l2_format *f)
 910 {
 911         struct stm32_dcmi *dcmi = video_drvdata(file);
 912
 913         if (vb2_is_streaming(&dcmi->queue))
 914                 return -EBUSY;
 915
 916         return dcmi_set_fmt(dcmi, f);
 917 }
 918
 919 static int dcmi_try_fmt_vid_cap(struct file *file, void *priv,
 920                                 struct v4l2_format *f)
 921 {
 922         struct stm32_dcmi *dcmi = video_drvdata(file);
 923
 924         return dcmi_try_fmt(dcmi, f, NULL, NULL);
 925 }
 926
 927 static int dcmi_enum_fmt_vid_cap(struct file *file, void  *priv,
 928                                  struct v4l2_fmtdesc *f)
 929 {
 930         struct stm32_dcmi *dcmi = video_drvdata(file);
 931
 932         if (f->index >= dcmi->num_of_sd_formats)
 933                 return -EINVAL;
 934
 935         f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
 936         return 0;
 937 }
 938
 939 static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi,
 940                                   struct v4l2_pix_format *pix)
 941 {
 942         struct v4l2_subdev_format fmt = {
 943                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 944         };
 945         int ret;
 946
 947         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, get_fmt, NULL, &fmt);
 948         if (ret)
 949                 return ret;
 950
 951         v4l2_fill_pix_format(pix, &fmt.format);
 952
 953         return 0;
 954 }
 955
 956 static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
 957                                   struct v4l2_pix_format *pix)
 958 {
 959         const struct dcmi_format *sd_fmt;
 960         struct v4l2_subdev_format format = {
 961                 .which = V4L2_SUBDEV_FORMAT_TRY,
 962         };
 963         struct v4l2_subdev_pad_config pad_cfg;
 964         int ret;
 965
 966         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
 967         if (!sd_fmt) {
 968                 if (!dcmi->num_of_sd_formats)
 969                         return -ENODATA;
 970
 971                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
 972                 pix->pixelformat = sd_fmt->fourcc;
 973         }
 974
 975         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
 976         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, set_fmt,
 977                                &pad_cfg, &format);
 978         if (ret < 0)
 979                 return ret;
 980
 981         return 0;
 982 }
 983
 984 static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi,
 985                                   struct v4l2_rect *r)
 986 {
 987         struct v4l2_subdev_selection bounds = {
 988                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 989                 .target = V4L2_SEL_TGT_CROP_BOUNDS,
 990         };
 991         unsigned int max_width, max_height, max_pixsize;
 992         struct v4l2_pix_format pix;
 993         unsigned int i;
 994         int ret;
 995
 996         /*
 997          * Get sensor bounds first
 998          */
 999         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, get_selection,
1000                                NULL, &bounds);
1001         if (!ret)
1002                 *r = bounds.r;
1003         if (ret != -ENOIOCTLCMD)
1004                 return ret;
1005
1006         /*
1007          * If selection is not implemented,
1008          * fallback by enumerating sensor frame sizes
1009          * and take the largest one
1010          */
1011         max_width = 0;
1012         max_height = 0;
1013         max_pixsize = 0;
1014         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1015                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
1016                 unsigned int pixsize = fsize->width * fsize->height;
1017
1018                 if (pixsize > max_pixsize) {
1019                         max_pixsize = pixsize;
1020                         max_width = fsize->width;
1021                         max_height = fsize->height;
1022                 }
1023         }
1024         if (max_pixsize > 0) {
1025                 r->top = 0;
1026                 r->left = 0;
1027                 r->width = max_width;
1028                 r->height = max_height;
1029                 return 0;
1030         }
1031
1032         /*
1033          * If frame sizes enumeration is not implemented,
1034          * fallback by getting current sensor frame size
1035          */
1036         ret = dcmi_get_sensor_format(dcmi, &pix);
1037         if (ret)
1038                 return ret;
1039
1040         r->top = 0;
1041         r->left = 0;
1042         r->width = pix.width;
1043         r->height = pix.height;
1044
1045         return 0;
1046 }
1047
1048 static int dcmi_g_selection(struct file *file, void *fh,
1049                             struct v4l2_selection *s)
1050 {
1051         struct stm32_dcmi *dcmi = video_drvdata(file);
1052
1053         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1054                 return -EINVAL;
1055
1056         switch (s->target) {
1057         case V4L2_SEL_TGT_CROP_DEFAULT:
1058         case V4L2_SEL_TGT_CROP_BOUNDS:
1059                 s->r = dcmi->sd_bounds;
1060                 return 0;
1061         case V4L2_SEL_TGT_CROP:
1062                 if (dcmi->do_crop) {
1063                         s->r = dcmi->crop;
1064                 } else {
1065                         s->r.top = 0;
1066                         s->r.left = 0;
1067                         s->r.width = dcmi->fmt.fmt.pix.width;
1068                         s->r.height = dcmi->fmt.fmt.pix.height;
1069                 }
1070                 break;
1071         default:
1072                 return -EINVAL;
1073         }
1074
1075         return 0;
1076 }
1077
1078 static int dcmi_s_selection(struct file *file, void *priv,
1079                             struct v4l2_selection *s)
1080 {
1081         struct stm32_dcmi *dcmi = video_drvdata(file);
1082         struct v4l2_rect r = s->r;
1083         struct v4l2_rect max_rect;
1084         struct v4l2_pix_format pix;
1085
1086         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1087             s->target != V4L2_SEL_TGT_CROP)
1088                 return -EINVAL;
1089
1090         /* Reset sensor resolution to max resolution */
1091         pix.pixelformat = dcmi->fmt.fmt.pix.pixelformat;
1092         pix.width = dcmi->sd_bounds.width;
1093         pix.height = dcmi->sd_bounds.height;
1094         dcmi_set_sensor_format(dcmi, &pix);
1095
1096         /*
1097          * Make the intersection between
1098          * sensor resolution
1099          * and crop request
1100          */
1101         max_rect.top = 0;
1102         max_rect.left = 0;
1103         max_rect.width = pix.width;
1104         max_rect.height = pix.height;
1105         v4l2_rect_map_inside(&r, &max_rect);
1106         r.top  = clamp_t(s32, r.top, 0, pix.height - r.height);
1107         r.left = clamp_t(s32, r.left, 0, pix.width - r.width);
1108
1109         if (!((r.top == dcmi->sd_bounds.top) &&
1110               (r.left == dcmi->sd_bounds.left) &&
1111               (r.width == dcmi->sd_bounds.width) &&
1112               (r.height == dcmi->sd_bounds.height))) {
1113                 /* Crop if request is different than sensor resolution */
1114                 dcmi->do_crop = true;
1115                 dcmi->crop = r;
1116                 dev_dbg(dcmi->dev, "s_selection: crop %ux%u@(%u,%u) from %ux%u\n",
1117                         r.width, r.height, r.left, r.top,
1118                         pix.width, pix.height);
1119         } else {
1120                 /* Disable crop */
1121                 dcmi->do_crop = false;
1122                 dev_dbg(dcmi->dev, "s_selection: crop is disabled\n");
1123         }
1124
1125         s->r = r;
1126         return 0;
1127 }
1128
1129 static int dcmi_querycap(struct file *file, void *priv,
1130                          struct v4l2_capability *cap)
1131 {
1132         strlcpy(cap->driver, DRV_NAME, sizeof(cap->driver));
1133         strlcpy(cap->card, "STM32 Camera Memory Interface",
1134                 sizeof(cap->card));
1135         strlcpy(cap->bus_info, "platform:dcmi", sizeof(cap->bus_info));
1136         return 0;
1137 }
1138
1139 static int dcmi_enum_input(struct file *file, void *priv,
1140                            struct v4l2_input *i)
1141 {
1142         if (i->index != 0)
1143                 return -EINVAL;
1144
1145         i->type = V4L2_INPUT_TYPE_CAMERA;
1146         strlcpy(i->name, "Camera", sizeof(i->name));
1147         return 0;
1148 }
1149
1150 static int dcmi_g_input(struct file *file, void *priv, unsigned int *i)
1151 {
1152         *i = 0;
1153         return 0;
1154 }
1155
1156 static int dcmi_s_input(struct file *file, void *priv, unsigned int i)
1157 {
1158         if (i > 0)
1159                 return -EINVAL;
1160         return 0;
1161 }
1162
1163 static int dcmi_enum_framesizes(struct file *file, void *fh,
1164                                 struct v4l2_frmsizeenum *fsize)
1165 {
1166         struct stm32_dcmi *dcmi = video_drvdata(file);
1167         const struct dcmi_format *sd_fmt;
1168         struct v4l2_subdev_frame_size_enum fse = {
1169                 .index = fsize->index,
1170                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1171         };
1172         int ret;
1173
1174         sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
1175         if (!sd_fmt)
1176                 return -EINVAL;
1177
1178         fse.code = sd_fmt->mbus_code;
1179
1180         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, enum_frame_size,
1181                                NULL, &fse);
1182         if (ret)
1183                 return ret;
1184
1185         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1186         fsize->discrete.width = fse.max_width;
1187         fsize->discrete.height = fse.max_height;
1188
1189         return 0;
1190 }
1191
1192 static int dcmi_enum_frameintervals(struct file *file, void *fh,
1193                                     struct v4l2_frmivalenum *fival)
1194 {
1195         struct stm32_dcmi *dcmi = video_drvdata(file);
1196         const struct dcmi_format *sd_fmt;
1197         struct v4l2_subdev_frame_interval_enum fie = {
1198                 .index = fival->index,
1199                 .width = fival->width,
1200                 .height = fival->height,
1201                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1202         };
1203         int ret;
1204
1205         sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
1206         if (!sd_fmt)
1207                 return -EINVAL;
1208
1209         fie.code = sd_fmt->mbus_code;
1210
1211         ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
1212                                enum_frame_interval, NULL, &fie);
1213         if (ret)
1214                 return ret;
1215
1216         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1217         fival->discrete = fie.interval;
1218
1219         return 0;
1220 }
1221
1222 static const struct of_device_id stm32_dcmi_of_match[] = {
1223         { .compatible = "st,stm32-dcmi"},
1224         { /* end node */ },
1225 };
1226 MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match);
1227
1228 static int dcmi_open(struct file *file)
1229 {
1230         struct stm32_dcmi *dcmi = video_drvdata(file);
1231         struct v4l2_subdev *sd = dcmi->entity.subdev;
1232         int ret;
1233
1234         if (mutex_lock_interruptible(&dcmi->lock))
1235                 return -ERESTARTSYS;
1236
1237         ret = v4l2_fh_open(file);
1238         if (ret < 0)
1239                 goto unlock;
1240
1241         if (!v4l2_fh_is_singular_file(file))
1242                 goto fh_rel;
1243
1244         ret = v4l2_subdev_call(sd, core, s_power, 1);
1245         if (ret < 0 && ret != -ENOIOCTLCMD)
1246                 goto fh_rel;
1247
1248         ret = dcmi_set_fmt(dcmi, &dcmi->fmt);
1249         if (ret)
1250                 v4l2_subdev_call(sd, core, s_power, 0);
1251 fh_rel:
1252         if (ret)
1253                 v4l2_fh_release(file);
1254 unlock:
1255         mutex_unlock(&dcmi->lock);
1256         return ret;
1257 }
1258
1259 static int dcmi_release(struct file *file)
1260 {
1261         struct stm32_dcmi *dcmi = video_drvdata(file);
1262         struct v4l2_subdev *sd = dcmi->entity.subdev;
1263         bool fh_singular;
1264         int ret;
1265
1266         mutex_lock(&dcmi->lock);
1267
1268         fh_singular = v4l2_fh_is_singular_file(file);
1269
1270         ret = _vb2_fop_release(file, NULL);
1271
1272         if (fh_singular)
1273                 v4l2_subdev_call(sd, core, s_power, 0);
1274
1275         mutex_unlock(&dcmi->lock);
1276
1277         return ret;
1278 }
1279
1280 static const struct v4l2_ioctl_ops dcmi_ioctl_ops = {
1281         .vidioc_querycap                = dcmi_querycap,
1282
1283         .vidioc_try_fmt_vid_cap         = dcmi_try_fmt_vid_cap,
1284         .vidioc_g_fmt_vid_cap           = dcmi_g_fmt_vid_cap,
1285         .vidioc_s_fmt_vid_cap           = dcmi_s_fmt_vid_cap,
1286         .vidioc_enum_fmt_vid_cap        = dcmi_enum_fmt_vid_cap,
1287         .vidioc_g_selection             = dcmi_g_selection,
1288         .vidioc_s_selection             = dcmi_s_selection,
1289
1290         .vidioc_enum_input              = dcmi_enum_input,
1291         .vidioc_g_input                 = dcmi_g_input,
1292         .vidioc_s_input                 = dcmi_s_input,
1293
1294         .vidioc_enum_framesizes         = dcmi_enum_framesizes,
1295         .vidioc_enum_frameintervals     = dcmi_enum_frameintervals,
1296
1297         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1298         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1299         .vidioc_querybuf                = vb2_ioctl_querybuf,
1300         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1301         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1302         .vidioc_expbuf                  = vb2_ioctl_expbuf,
1303         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1304         .vidioc_streamon                = vb2_ioctl_streamon,
1305         .vidioc_streamoff               = vb2_ioctl_streamoff,
1306
1307         .vidioc_log_status              = v4l2_ctrl_log_status,
1308         .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
1309         .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
1310 };
1311
1312 static const struct v4l2_file_operations dcmi_fops = {
1313         .owner          = THIS_MODULE,
1314         .unlocked_ioctl = video_ioctl2,
1315         .open           = dcmi_open,
1316         .release        = dcmi_release,
1317         .poll           = vb2_fop_poll,
1318         .mmap           = vb2_fop_mmap,
1319 #ifndef CONFIG_MMU
1320         .get_unmapped_area = vb2_fop_get_unmapped_area,
1321 #endif
1322         .read           = vb2_fop_read,
1323 };
1324
1325 static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
1326 {
1327         struct v4l2_format f = {
1328                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1329                 .fmt.pix = {
1330                         .width          = CIF_WIDTH,
1331                         .height         = CIF_HEIGHT,
1332                         .field          = V4L2_FIELD_NONE,
1333                         .pixelformat    = dcmi->sd_formats[0]->fourcc,
1334                 },
1335         };
1336         int ret;
1337
1338         ret = dcmi_try_fmt(dcmi, &f, NULL, NULL);
1339         if (ret)
1340                 return ret;
1341         dcmi->sd_format = dcmi->sd_formats[0];
1342         dcmi->fmt = f;
1343         return 0;
1344 }
1345
1346 static const struct dcmi_format dcmi_formats[] = {
1347         {
1348                 .fourcc = V4L2_PIX_FMT_RGB565,
1349                 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
1350                 .bpp = 2,
1351         }, {
1352                 .fourcc = V4L2_PIX_FMT_YUYV,
1353                 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1354                 .bpp = 2,
1355         }, {
1356                 .fourcc = V4L2_PIX_FMT_UYVY,
1357                 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1358                 .bpp = 2,
1359         },
1360 };
1361
1362 static int dcmi_formats_init(struct stm32_dcmi *dcmi)
1363 {
1364         const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
1365         unsigned int num_fmts = 0, i, j;
1366         struct v4l2_subdev *subdev = dcmi->entity.subdev;
1367         struct v4l2_subdev_mbus_code_enum mbus_code = {
1368                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1369         };
1370
1371         while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1372                                  NULL, &mbus_code)) {
1373                 for (i = 0; i < ARRAY_SIZE(dcmi_formats); i++) {
1374                         if (dcmi_formats[i].mbus_code != mbus_code.code)
1375                                 continue;
1376
1377                         /* Code supported, have we got this fourcc yet? */
1378                         for (j = 0; j < num_fmts; j++)
1379                                 if (sd_fmts[j]->fourcc ==
1380                                                 dcmi_formats[i].fourcc)
1381                                         /* Already available */
1382                                         break;
1383                         if (j == num_fmts)
1384                                 /* New */
1385                                 sd_fmts[num_fmts++] = dcmi_formats + i;
1386                 }
1387                 mbus_code.index++;
1388         }
1389
1390         if (!num_fmts)
1391                 return -ENXIO;
1392
1393         dcmi->num_of_sd_formats = num_fmts;
1394         dcmi->sd_formats = devm_kcalloc(dcmi->dev,
1395                                         num_fmts, sizeof(struct dcmi_format *),
1396                                         GFP_KERNEL);
1397         if (!dcmi->sd_formats) {
1398                 dev_err(dcmi->dev, "Could not allocate memory\n");
1399                 return -ENOMEM;
1400         }
1401
1402         memcpy(dcmi->sd_formats, sd_fmts,
1403                num_fmts * sizeof(struct dcmi_format *));
1404         dcmi->sd_format = dcmi->sd_formats[0];
1405
1406         return 0;
1407 }
1408
1409 static int dcmi_framesizes_init(struct stm32_dcmi *dcmi)
1410 {
1411         unsigned int num_fsize = 0;
1412         struct v4l2_subdev *subdev = dcmi->entity.subdev;
1413         struct v4l2_subdev_frame_size_enum fse = {
1414                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1415                 .code = dcmi->sd_format->mbus_code,
1416         };
1417         unsigned int ret;
1418         unsigned int i;
1419
1420         /* Allocate discrete framesizes array */
1421         while (!v4l2_subdev_call(subdev, pad, enum_frame_size,
1422                                  NULL, &fse))
1423                 fse.index++;
1424
1425         num_fsize = fse.index;
1426         if (!num_fsize)
1427                 return 0;
1428
1429         dcmi->num_of_sd_framesizes = num_fsize;
1430         dcmi->sd_framesizes = devm_kcalloc(dcmi->dev, num_fsize,
1431                                            sizeof(struct dcmi_framesize),
1432                                            GFP_KERNEL);
1433         if (!dcmi->sd_framesizes) {
1434                 dev_err(dcmi->dev, "Could not allocate memory\n");
1435                 return -ENOMEM;
1436         }
1437
1438         /* Fill array with sensor supported framesizes */
1439         dev_dbg(dcmi->dev, "Sensor supports %u frame sizes:\n", num_fsize);
1440         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1441                 fse.index = i;
1442                 ret = v4l2_subdev_call(subdev, pad, enum_frame_size,
1443                                        NULL, &fse);
1444                 if (ret)
1445                         return ret;
1446                 dcmi->sd_framesizes[fse.index].width = fse.max_width;
1447                 dcmi->sd_framesizes[fse.index].height = fse.max_height;
1448                 dev_dbg(dcmi->dev, "%ux%u\n", fse.max_width, fse.max_height);
1449         }
1450
1451         return 0;
1452 }
1453
1454 static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1455 {
1456         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1457         int ret;
1458
1459         dcmi->vdev->ctrl_handler = dcmi->entity.subdev->ctrl_handler;
1460         ret = dcmi_formats_init(dcmi);
1461         if (ret) {
1462                 dev_err(dcmi->dev, "No supported mediabus format found\n");
1463                 return ret;
1464         }
1465
1466         ret = dcmi_framesizes_init(dcmi);
1467         if (ret) {
1468                 dev_err(dcmi->dev, "Could not initialize framesizes\n");
1469                 return ret;
1470         }
1471
1472         ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
1473         if (ret) {
1474                 dev_err(dcmi->dev, "Could not get sensor bounds\n");
1475                 return ret;
1476         }
1477
1478         ret = dcmi_set_default_fmt(dcmi);
1479         if (ret) {
1480                 dev_err(dcmi->dev, "Could not set default format\n");
1481                 return ret;
1482         }
1483
1484         ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1);
1485         if (ret) {
1486                 dev_err(dcmi->dev, "Failed to register video device\n");
1487                 return ret;
1488         }
1489
1490         dev_dbg(dcmi->dev, "Device registered as %s\n",
1491                 video_device_node_name(dcmi->vdev));
1492         return 0;
1493 }
1494
1495 static void dcmi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1496                                      struct v4l2_subdev *sd,
1497                                      struct v4l2_async_subdev *asd)
1498 {
1499         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1500
1501         dev_dbg(dcmi->dev, "Removing %s\n", video_device_node_name(dcmi->vdev));
1502
1503         /* Checks internaly if vdev has been init or not */
1504         video_unregister_device(dcmi->vdev);
1505 }
1506
1507 static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1508                                    struct v4l2_subdev *subdev,
1509                                    struct v4l2_async_subdev *asd)
1510 {
1511         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1512
1513         dev_dbg(dcmi->dev, "Subdev %s bound\n", subdev->name);
1514
1515         dcmi->entity.subdev = subdev;
1516
1517         return 0;
1518 }
1519
1520 static int dcmi_graph_parse(struct stm32_dcmi *dcmi, struct device_node *node)
1521 {
1522         struct device_node *ep = NULL;
1523         struct device_node *remote;
1524
1525         while (1) {
1526                 ep = of_graph_get_next_endpoint(node, ep);
1527                 if (!ep)
1528                         return -EINVAL;
1529
1530                 remote = of_graph_get_remote_port_parent(ep);
1531                 if (!remote) {
1532                         of_node_put(ep);
1533                         return -EINVAL;
1534                 }
1535
1536                 /* Remote node to connect */
1537                 dcmi->entity.node = remote;
1538                 dcmi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
1539                 dcmi->entity.asd.match.fwnode.fwnode = of_fwnode_handle(remote);
1540                 return 0;
1541         }
1542 }
1543
1544 static int dcmi_graph_init(struct stm32_dcmi *dcmi)
1545 {
1546         struct v4l2_async_subdev **subdevs = NULL;
1547         int ret;
1548
1549         /* Parse the graph to extract a list of subdevice DT nodes. */
1550         ret = dcmi_graph_parse(dcmi, dcmi->dev->of_node);
1551         if (ret < 0) {
1552                 dev_err(dcmi->dev, "Graph parsing failed\n");
1553                 return ret;
1554         }
1555
1556         /* Register the subdevices notifier. */
1557         subdevs = devm_kzalloc(dcmi->dev, sizeof(*subdevs), GFP_KERNEL);
1558         if (!subdevs) {
1559                 of_node_put(dcmi->entity.node);
1560                 return -ENOMEM;
1561         }
1562
1563         subdevs[0] = &dcmi->entity.asd;
1564
1565         dcmi->notifier.subdevs = subdevs;
1566         dcmi->notifier.num_subdevs = 1;
1567         dcmi->notifier.bound = dcmi_graph_notify_bound;
1568         dcmi->notifier.unbind = dcmi_graph_notify_unbind;
1569         dcmi->notifier.complete = dcmi_graph_notify_complete;
1570
1571         ret = v4l2_async_notifier_register(&dcmi->v4l2_dev, &dcmi->notifier);
1572         if (ret < 0) {
1573                 dev_err(dcmi->dev, "Notifier registration failed\n");
1574                 of_node_put(dcmi->entity.node);
1575                 return ret;
1576         }
1577
1578         return 0;
1579 }
1580
1581 static int dcmi_probe(struct platform_device *pdev)
1582 {
1583         struct device_node *np = pdev->dev.of_node;
1584         const struct of_device_id *match = NULL;
1585         struct v4l2_fwnode_endpoint ep;
1586         struct stm32_dcmi *dcmi;
1587         struct vb2_queue *q;
1588         struct dma_chan *chan;
1589         struct clk *mclk;
1590         int irq;
1591         int ret = 0;
1592
1593         match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev);
1594         if (!match) {
1595                 dev_err(&pdev->dev, "Could not find a match in devicetree\n");
1596                 return -ENODEV;
1597         }
1598
1599         dcmi = devm_kzalloc(&pdev->dev, sizeof(struct stm32_dcmi), GFP_KERNEL);
1600         if (!dcmi)
1601                 return -ENOMEM;
1602
1603         dcmi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
1604         if (IS_ERR(dcmi->rstc)) {
1605                 dev_err(&pdev->dev, "Could not get reset control\n");
1606                 return -ENODEV;
1607         }
1608
1609         /* Get bus characteristics from devicetree */
1610         np = of_graph_get_next_endpoint(np, NULL);
1611         if (!np) {
1612                 dev_err(&pdev->dev, "Could not find the endpoint\n");
1613                 of_node_put(np);
1614                 return -ENODEV;
1615         }
1616
1617         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
1618         if (ret) {
1619                 dev_err(&pdev->dev, "Could not parse the endpoint\n");
1620                 of_node_put(np);
1621                 return -ENODEV;
1622         }
1623
1624         if (ep.bus_type == V4L2_MBUS_CSI2) {
1625                 dev_err(&pdev->dev, "CSI bus not supported\n");
1626                 of_node_put(np);
1627                 return -ENODEV;
1628         }
1629         dcmi->bus.flags = ep.bus.parallel.flags;
1630         dcmi->bus.bus_width = ep.bus.parallel.bus_width;
1631         dcmi->bus.data_shift = ep.bus.parallel.data_shift;
1632
1633         of_node_put(np);
1634
1635         irq = platform_get_irq(pdev, 0);
1636         if (irq <= 0) {
1637                 dev_err(&pdev->dev, "Could not get irq\n");
1638                 return -ENODEV;
1639         }
1640
1641         dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1642         if (!dcmi->res) {
1643                 dev_err(&pdev->dev, "Could not get resource\n");
1644                 return -ENODEV;
1645         }
1646
1647         dcmi->regs = devm_ioremap_resource(&pdev->dev, dcmi->res);
1648         if (IS_ERR(dcmi->regs)) {
1649                 dev_err(&pdev->dev, "Could not map registers\n");
1650                 return PTR_ERR(dcmi->regs);
1651         }
1652
1653         ret = devm_request_threaded_irq(&pdev->dev, irq, dcmi_irq_callback,
1654                                         dcmi_irq_thread, IRQF_ONESHOT,
1655                                         dev_name(&pdev->dev), dcmi);
1656         if (ret) {
1657                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1658                 return -ENODEV;
1659         }
1660
1661         mclk = devm_clk_get(&pdev->dev, "mclk");
1662         if (IS_ERR(mclk)) {
1663                 dev_err(&pdev->dev, "Unable to get mclk\n");
1664                 return PTR_ERR(mclk);
1665         }
1666
1667         chan = dma_request_slave_channel(&pdev->dev, "tx");
1668         if (!chan) {
1669                 dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
1670                 return -EPROBE_DEFER;
1671         }
1672
1673         ret = clk_prepare(mclk);
1674         if (ret) {
1675                 dev_err(&pdev->dev, "Unable to prepare mclk %p\n", mclk);
1676                 goto err_dma_release;
1677         }
1678
1679         spin_lock_init(&dcmi->irqlock);
1680         mutex_init(&dcmi->lock);
1681         mutex_init(&dcmi->dma_lock);
1682         init_completion(&dcmi->complete);
1683         INIT_LIST_HEAD(&dcmi->buffers);
1684
1685         dcmi->dev = &pdev->dev;
1686         dcmi->mclk = mclk;
1687         dcmi->state = STOPPED;
1688         dcmi->dma_chan = chan;
1689
1690         q = &dcmi->queue;
1691
1692         /* Initialize the top-level structure */
1693         ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
1694         if (ret)
1695                 goto err_clk_unprepare;
1696
1697         dcmi->vdev = video_device_alloc();
1698         if (!dcmi->vdev) {
1699                 ret = -ENOMEM;
1700                 goto err_device_unregister;
1701         }
1702
1703         /* Video node */
1704         dcmi->vdev->fops = &dcmi_fops;
1705         dcmi->vdev->v4l2_dev = &dcmi->v4l2_dev;
1706         dcmi->vdev->queue = &dcmi->queue;
1707         strlcpy(dcmi->vdev->name, KBUILD_MODNAME, sizeof(dcmi->vdev->name));
1708         dcmi->vdev->release = video_device_release;
1709         dcmi->vdev->ioctl_ops = &dcmi_ioctl_ops;
1710         dcmi->vdev->lock = &dcmi->lock;
1711         dcmi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1712                                   V4L2_CAP_READWRITE;
1713         video_set_drvdata(dcmi->vdev, dcmi);
1714
1715         /* Buffer queue */
1716         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1717         q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1718         q->lock = &dcmi->lock;
1719         q->drv_priv = dcmi;
1720         q->buf_struct_size = sizeof(struct dcmi_buf);
1721         q->ops = &dcmi_video_qops;
1722         q->mem_ops = &vb2_dma_contig_memops;
1723         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1724         q->min_buffers_needed = 2;
1725         q->dev = &pdev->dev;
1726
1727         ret = vb2_queue_init(q);
1728         if (ret < 0) {
1729                 dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
1730                 goto err_device_release;
1731         }
1732
1733         ret = dcmi_graph_init(dcmi);
1734         if (ret < 0)
1735                 goto err_device_release;
1736
1737         /* Reset device */
1738         ret = reset_control_assert(dcmi->rstc);
1739         if (ret) {
1740                 dev_err(&pdev->dev, "Failed to assert the reset line\n");
1741                 goto err_device_release;
1742         }
1743
1744         usleep_range(3000, 5000);
1745
1746         ret = reset_control_deassert(dcmi->rstc);
1747         if (ret) {
1748                 dev_err(&pdev->dev, "Failed to deassert the reset line\n");
1749                 goto err_device_release;
1750         }
1751
1752         dev_info(&pdev->dev, "Probe done\n");
1753
1754         platform_set_drvdata(pdev, dcmi);
1755         return 0;
1756
1757 err_device_release:
1758         video_device_release(dcmi->vdev);
1759 err_device_unregister:
1760         v4l2_device_unregister(&dcmi->v4l2_dev);
1761 err_clk_unprepare:
1762         clk_unprepare(dcmi->mclk);
1763 err_dma_release:
1764         dma_release_channel(dcmi->dma_chan);
1765
1766         return ret;
1767 }
1768
1769 static int dcmi_remove(struct platform_device *pdev)
1770 {
1771         struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
1772
1773         v4l2_async_notifier_unregister(&dcmi->notifier);
1774         v4l2_device_unregister(&dcmi->v4l2_dev);
1775         clk_unprepare(dcmi->mclk);
1776         dma_release_channel(dcmi->dma_chan);
1777
1778         return 0;
1779 }
1780
1781 static struct platform_driver stm32_dcmi_driver = {
1782         .probe          = dcmi_probe,
1783         .remove         = dcmi_remove,
1784         .driver         = {
1785                 .name = DRV_NAME,
1786                 .of_match_table = of_match_ptr(stm32_dcmi_of_match),
1787         },
1788 };
1789
1790 module_platform_driver(stm32_dcmi_driver);
1791
1792 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
1793 MODULE_AUTHOR("Hugues Fruchet <hugues.fruchet@st.com>");
1794 MODULE_DESCRIPTION("STMicroelectronics STM32 Digital Camera Memory Interface driver");
1795 MODULE_LICENSE("GPL");
1796 MODULE_SUPPORTED_DEVICE("video");