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
 166 static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
 167 {
 168         return container_of(n, struct stm32_dcmi, notifier);
 169 }
 170
 171 static inline u32 reg_read(void __iomem *base, u32 reg)
 172 {
 173         return readl_relaxed(base + reg);
 174 }
 175
 176 static inline void reg_write(void __iomem *base, u32 reg, u32 val)
 177 {
 178         writel_relaxed(val, base + reg);
 179 }
 180
 181 static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
 182 {
 183         reg_write(base, reg, reg_read(base, reg) | mask);
 184 }
 185
 186 static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
 187 {
 188         reg_write(base, reg, reg_read(base, reg) & ~mask);
 189 }
 190
 191 static int dcmi_start_capture(struct stm32_dcmi *dcmi);
 192
 193 static void dcmi_dma_callback(void *param)
 194 {
 195         struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
 196         struct dma_chan *chan = dcmi->dma_chan;
 197         struct dma_tx_state state;
 198         enum dma_status status;
 199
 200         spin_lock(&dcmi->irqlock);
 201
 202         /* Check DMA status */
 203         status = dmaengine_tx_status(chan, dcmi->dma_cookie, &state);
 204
 205         switch (status) {
 206         case DMA_IN_PROGRESS:
 207                 dev_dbg(dcmi->dev, "%s: Received DMA_IN_PROGRESS\n", __func__);
 208                 break;
 209         case DMA_PAUSED:
 210                 dev_err(dcmi->dev, "%s: Received DMA_PAUSED\n", __func__);
 211                 break;
 212         case DMA_ERROR:
 213                 dev_err(dcmi->dev, "%s: Received DMA_ERROR\n", __func__);
 214                 break;
 215         case DMA_COMPLETE:
 216                 dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
 217
 218                 if (dcmi->active) {
 219                         struct dcmi_buf *buf = dcmi->active;
 220                         struct vb2_v4l2_buffer *vbuf = &dcmi->active->vb;
 221
 222                         vbuf->sequence = dcmi->sequence++;
 223                         vbuf->field = V4L2_FIELD_NONE;
 224                         vbuf->vb2_buf.timestamp = ktime_get_ns();
 225                         vb2_set_plane_payload(&vbuf->vb2_buf, 0, buf->size);
 226                         vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
 227                         dev_dbg(dcmi->dev, "buffer[%d] done seq=%d\n",
 228                                 vbuf->vb2_buf.index, vbuf->sequence);
 229
 230                         dcmi->buffers_count++;
 231                         dcmi->active = NULL;
 232                 }
 233
 234                 /* Restart a new DMA transfer with next buffer */
 235                 if (dcmi->state == RUNNING) {
 236                         if (list_empty(&dcmi->buffers)) {
 237                                 dev_err(dcmi->dev, "%s: No more buffer queued, cannot capture buffer",
 238                                         __func__);
 239                                 dcmi->errors_count++;
 240                                 dcmi->active = NULL;
 241
 242                                 spin_unlock(&dcmi->irqlock);
 243                                 return;
 244                         }
 245
 246                         dcmi->active = list_entry(dcmi->buffers.next,
 247                                                   struct dcmi_buf, list);
 248
 249                         list_del_init(&dcmi->active->list);
 250
 251                         if (dcmi_start_capture(dcmi)) {
 252                                 dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete",
 253                                         __func__);
 254
 255                                 spin_unlock(&dcmi->irqlock);
 256                                 return;
 257                         }
 258
 259                         /* Enable capture */
 260                         reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
 261                 }
 262
 263                 break;
 264         default:
 265                 dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
 266                 break;
 267         }
 268
 269         spin_unlock(&dcmi->irqlock);
 270 }
 271
 272 static int dcmi_start_dma(struct stm32_dcmi *dcmi,
 273                           struct dcmi_buf *buf)
 274 {
 275         struct dma_async_tx_descriptor *desc = NULL;
 276         struct dma_slave_config config;
 277         int ret;
 278
 279         memset(&config, 0, sizeof(config));
 280
 281         config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
 282         config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 283         config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 284         config.dst_maxburst = 4;
 285
 286         /* Configure DMA channel */
 287         ret = dmaengine_slave_config(dcmi->dma_chan, &config);
 288         if (ret < 0) {
 289                 dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
 290                         __func__, ret);
 291                 return ret;
 292         }
 293
 294         /* Prepare a DMA transaction */
 295         desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
 296                                            buf->size,
 297                                            DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
 298         if (!desc) {
 299                 dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer size %zu\n",
 300                         __func__, buf->size);
 301                 return -EINVAL;
 302         }
 303
 304         /* Set completion callback routine for notification */
 305         desc->callback = dcmi_dma_callback;
 306         desc->callback_param = dcmi;
 307
 308         /* Push current DMA transaction in the pending queue */
 309         dcmi->dma_cookie = dmaengine_submit(desc);
 310         if (dma_submit_error(dcmi->dma_cookie)) {
 311                 dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
 312                 return -ENXIO;
 313         }
 314
 315         dma_async_issue_pending(dcmi->dma_chan);
 316
 317         return 0;
 318 }
 319
 320 static int dcmi_start_capture(struct stm32_dcmi *dcmi)
 321 {
 322         int ret;
 323         struct dcmi_buf *buf = dcmi->active;
 324
 325         if (!buf)
 326                 return -EINVAL;
 327
 328         ret = dcmi_start_dma(dcmi, buf);
 329         if (ret) {
 330                 dcmi->errors_count++;
 331                 return ret;
 332         }
 333
 334         /* Enable capture */
 335         reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
 336
 337         return 0;
 338 }
 339
 340 static void dcmi_set_crop(struct stm32_dcmi *dcmi)
 341 {
 342         u32 size, start;
 343
 344         /* Crop resolution */
 345         size = ((dcmi->crop.height - 1) << 16) |
 346                 ((dcmi->crop.width << 1) - 1);
 347         reg_write(dcmi->regs, DCMI_CWSIZE, size);
 348
 349         /* Crop start point */
 350         start = ((dcmi->crop.top) << 16) |
 351                  ((dcmi->crop.left << 1));
 352         reg_write(dcmi->regs, DCMI_CWSTRT, start);
 353
 354         dev_dbg(dcmi->dev, "Cropping to %ux%u@%u:%u\n",
 355                 dcmi->crop.width, dcmi->crop.height,
 356                 dcmi->crop.left, dcmi->crop.top);
 357
 358         /* Enable crop */
 359         reg_set(dcmi->regs, DCMI_CR, CR_CROP);
 360 }
 361
 362 static irqreturn_t dcmi_irq_thread(int irq, void *arg)
 363 {
 364         struct stm32_dcmi *dcmi = arg;
 365
 366         spin_lock(&dcmi->irqlock);
 367
 368         /* Stop capture is required */
 369         if (dcmi->state == STOPPING) {
 370                 reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 371
 372                 dcmi->state = STOPPED;
 373
 374                 complete(&dcmi->complete);
 375
 376                 spin_unlock(&dcmi->irqlock);
 377                 return IRQ_HANDLED;
 378         }
 379
 380         if ((dcmi->misr & IT_OVR) || (dcmi->misr & IT_ERR)) {
 381                 /*
 382                  * An overflow or an error has been detected,
 383                  * stop current DMA transfert & restart it
 384                  */
 385                 dev_warn(dcmi->dev, "%s: Overflow or error detected\n",
 386                          __func__);
 387
 388                 dcmi->errors_count++;
 389                 dmaengine_terminate_all(dcmi->dma_chan);
 390
 391                 reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
 392
 393                 dev_dbg(dcmi->dev, "Restarting capture after DCMI error\n");
 394
 395                 if (dcmi_start_capture(dcmi)) {
 396                         dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
 397                                 __func__);
 398
 399                         spin_unlock(&dcmi->irqlock);
 400                         return IRQ_HANDLED;
 401                 }
 402         }
 403
 404         spin_unlock(&dcmi->irqlock);
 405         return IRQ_HANDLED;
 406 }
 407
 408 static irqreturn_t dcmi_irq_callback(int irq, void *arg)
 409 {
 410         struct stm32_dcmi *dcmi = arg;
 411
 412         spin_lock(&dcmi->irqlock);
 413
 414         dcmi->misr = reg_read(dcmi->regs, DCMI_MIS);
 415
 416         /* Clear interrupt */
 417         reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
 418
 419         spin_unlock(&dcmi->irqlock);
 420
 421         return IRQ_WAKE_THREAD;
 422 }
 423
 424 static int dcmi_queue_setup(struct vb2_queue *vq,
 425                             unsigned int *nbuffers,
 426                             unsigned int *nplanes,
 427                             unsigned int sizes[],
 428                             struct device *alloc_devs[])
 429 {
 430         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 431         unsigned int size;
 432
 433         size = dcmi->fmt.fmt.pix.sizeimage;
 434
 435         /* Make sure the image size is large enough */
 436         if (*nplanes)
 437                 return sizes[0] < size ? -EINVAL : 0;
 438
 439         *nplanes = 1;
 440         sizes[0] = size;
 441
 442         dcmi->active = NULL;
 443
 444         dev_dbg(dcmi->dev, "Setup queue, count=%d, size=%d\n",
 445                 *nbuffers, size);
 446
 447         return 0;
 448 }
 449
 450 static int dcmi_buf_init(struct vb2_buffer *vb)
 451 {
 452         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 453         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 454
 455         INIT_LIST_HEAD(&buf->list);
 456
 457         return 0;
 458 }
 459
 460 static int dcmi_buf_prepare(struct vb2_buffer *vb)
 461 {
 462         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 463         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 464         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 465         unsigned long size;
 466
 467         size = dcmi->fmt.fmt.pix.sizeimage;
 468
 469         if (vb2_plane_size(vb, 0) < size) {
 470                 dev_err(dcmi->dev, "%s data will not fit into plane (%lu < %lu)\n",
 471                         __func__, vb2_plane_size(vb, 0), size);
 472                 return -EINVAL;
 473         }
 474
 475         vb2_set_plane_payload(vb, 0, size);
 476
 477         if (!buf->prepared) {
 478                 /* Get memory addresses */
 479                 buf->paddr =
 480                         vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
 481                 buf->size = vb2_plane_size(&buf->vb.vb2_buf, 0);
 482                 buf->prepared = true;
 483
 484                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->size);
 485
 486                 dev_dbg(dcmi->dev, "buffer[%d] phy=0x%pad size=%zu\n",
 487                         vb->index, &buf->paddr, buf->size);
 488         }
 489
 490         return 0;
 491 }
 492
 493 static void dcmi_buf_queue(struct vb2_buffer *vb)
 494 {
 495         struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
 496         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 497         struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 498         unsigned long flags = 0;
 499
 500         spin_lock_irqsave(&dcmi->irqlock, flags);
 501
 502         if ((dcmi->state == RUNNING) && (!dcmi->active)) {
 503                 dcmi->active = buf;
 504
 505                 dev_dbg(dcmi->dev, "Starting capture on buffer[%d] queued\n",
 506                         buf->vb.vb2_buf.index);
 507
 508                 if (dcmi_start_capture(dcmi)) {
 509                         dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
 510                                 __func__);
 511
 512                         spin_unlock_irqrestore(&dcmi->irqlock, flags);
 513                         return;
 514                 }
 515         } else {
 516                 /* Enqueue to video buffers list */
 517                 list_add_tail(&buf->list, &dcmi->buffers);
 518         }
 519
 520         spin_unlock_irqrestore(&dcmi->irqlock, flags);
 521 }
 522
 523 static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 524 {
 525         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 526         struct dcmi_buf *buf, *node;
 527         u32 val = 0;
 528         int ret;
 529
 530         ret = clk_enable(dcmi->mclk);
 531         if (ret) {
 532                 dev_err(dcmi->dev, "%s: Failed to start streaming, cannot enable clock",
 533                         __func__);
 534                 goto err_release_buffers;
 535         }
 536
 537         /* Enable stream on the sub device */
 538         ret = v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 1);
 539         if (ret && ret != -ENOIOCTLCMD) {
 540                 dev_err(dcmi->dev, "%s: Failed to start streaming, subdev streamon error",
 541                         __func__);
 542                 goto err_disable_clock;
 543         }
 544
 545         spin_lock_irq(&dcmi->irqlock);
 546
 547         /* Set bus width */
 548         switch (dcmi->bus.bus_width) {
 549         case 14:
 550                 val |= CR_EDM_0 | CR_EDM_1;
 551                 break;
 552         case 12:
 553                 val |= CR_EDM_1;
 554                 break;
 555         case 10:
 556                 val |= CR_EDM_0;
 557                 break;
 558         default:
 559                 /* Set bus width to 8 bits by default */
 560                 break;
 561         }
 562
 563         /* Set vertical synchronization polarity */
 564         if (dcmi->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 565                 val |= CR_VSPOL;
 566
 567         /* Set horizontal synchronization polarity */
 568         if (dcmi->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 569                 val |= CR_HSPOL;
 570
 571         /* Set pixel clock polarity */
 572         if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 573                 val |= CR_PCKPOL;
 574
 575         reg_write(dcmi->regs, DCMI_CR, val);
 576
 577         /* Set crop */
 578         if (dcmi->do_crop)
 579                 dcmi_set_crop(dcmi);
 580
 581         /* Enable dcmi */
 582         reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
 583
 584         dcmi->state = RUNNING;
 585
 586         dcmi->sequence = 0;
 587         dcmi->errors_count = 0;
 588         dcmi->buffers_count = 0;
 589         dcmi->active = NULL;
 590
 591         /*
 592          * Start transfer if at least one buffer has been queued,
 593          * otherwise transfer is deferred at buffer queueing
 594          */
 595         if (list_empty(&dcmi->buffers)) {
 596                 dev_dbg(dcmi->dev, "Start streaming is deferred to next buffer queueing\n");
 597                 spin_unlock_irq(&dcmi->irqlock);
 598                 return 0;
 599         }
 600
 601         dcmi->active = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
 602         list_del_init(&dcmi->active->list);
 603
 604         dev_dbg(dcmi->dev, "Start streaming, starting capture\n");
 605
 606         ret = dcmi_start_capture(dcmi);
 607         if (ret) {
 608                 dev_err(dcmi->dev, "%s: Start streaming failed, cannot start capture",
 609                         __func__);
 610
 611                 spin_unlock_irq(&dcmi->irqlock);
 612                 goto err_subdev_streamoff;
 613         }
 614
 615         /* Enable interruptions */
 616         reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 617
 618         spin_unlock_irq(&dcmi->irqlock);
 619
 620         return 0;
 621
 622 err_subdev_streamoff:
 623         v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 0);
 624
 625 err_disable_clock:
 626         clk_disable(dcmi->mclk);
 627
 628 err_release_buffers:
 629         spin_lock_irq(&dcmi->irqlock);
 630         /*
 631          * Return all buffers to vb2 in QUEUED state.
 632          * This will give ownership back to userspace
 633          */
 634         if (dcmi->active) {
 635                 buf = dcmi->active;
 636                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
 637                 dcmi->active = NULL;
 638         }
 639         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 640                 list_del_init(&buf->list);
 641                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
 642         }
 643         spin_unlock_irq(&dcmi->irqlock);
 644
 645         return ret;
 646 }
 647
 648 static void dcmi_stop_streaming(struct vb2_queue *vq)
 649 {
 650         struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
 651         struct dcmi_buf *buf, *node;
 652         unsigned long time_ms = msecs_to_jiffies(TIMEOUT_MS);
 653         long timeout;
 654         int ret;
 655
 656         /* Disable stream on the sub device */
 657         ret = v4l2_subdev_call(dcmi->entity.subdev, video, s_stream, 0);
 658         if (ret && ret != -ENOIOCTLCMD)
 659                 dev_err(dcmi->dev, "stream off failed in subdev\n");
 660
 661         dcmi->state = STOPPING;
 662
 663         timeout = wait_for_completion_interruptible_timeout(&dcmi->complete,
 664                                                             time_ms);
 665
 666         spin_lock_irq(&dcmi->irqlock);
 667
 668         /* Disable interruptions */
 669         reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 670
 671         /* Disable DCMI */
 672         reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
 673
 674         if (!timeout) {
 675                 dev_err(dcmi->dev, "Timeout during stop streaming\n");
 676                 dcmi->state = STOPPED;
 677         }
 678
 679         /* Return all queued buffers to vb2 in ERROR state */
 680         if (dcmi->active) {
 681                 buf = dcmi->active;
 682                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 683                 dcmi->active = NULL;
 684         }
 685         list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
 686                 list_del_init(&buf->list);
 687                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 688         }
 689
 690         spin_unlock_irq(&dcmi->irqlock);
 691
 692         /* Stop all pending DMA operations */
 693         dmaengine_terminate_all(dcmi->dma_chan);
 694
 695         clk_disable(dcmi->mclk);
 696
 697         dev_dbg(dcmi->dev, "Stop streaming, errors=%d buffers=%d\n",
 698                 dcmi->errors_count, dcmi->buffers_count);
 699 }
 700
 701 static const struct vb2_ops dcmi_video_qops = {
 702         .queue_setup            = dcmi_queue_setup,
 703         .buf_init               = dcmi_buf_init,
 704         .buf_prepare            = dcmi_buf_prepare,
 705         .buf_queue              = dcmi_buf_queue,
 706         .start_streaming        = dcmi_start_streaming,
 707         .stop_streaming         = dcmi_stop_streaming,
 708         .wait_prepare           = vb2_ops_wait_prepare,
 709         .wait_finish            = vb2_ops_wait_finish,
 710 };
 711
 712 static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
 713                               struct v4l2_format *fmt)
 714 {
 715         struct stm32_dcmi *dcmi = video_drvdata(file);
 716
 717         *fmt = dcmi->fmt;
 718
 719         return 0;
 720 }
 721
 722 static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
 723                                                        unsigned int fourcc)
 724 {
 725         unsigned int num_formats = dcmi->num_of_sd_formats;
 726         const struct dcmi_format *fmt;
 727         unsigned int i;
 728
 729         for (i = 0; i < num_formats; i++) {
 730                 fmt = dcmi->sd_formats[i];
 731                 if (fmt->fourcc == fourcc)
 732                         return fmt;
 733         }
 734
 735         return NULL;
 736 }
 737
 738 static void __find_outer_frame_size(struct stm32_dcmi *dcmi,
 739                                     struct v4l2_pix_format *pix,
 740                                     struct dcmi_framesize *framesize)
 741 {
 742         struct dcmi_framesize *match = NULL;
 743         unsigned int i;
 744         unsigned int min_err = UINT_MAX;
 745
 746         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
 747                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
 748                 int w_err = (fsize->width - pix->width);
 749                 int h_err = (fsize->height - pix->height);
 750                 int err = w_err + h_err;
 751
 752                 if ((w_err >= 0) && (h_err >= 0) && (err < min_err)) {
 753                         min_err = err;
 754                         match = fsize;
 755                 }
 756         }
 757         if (!match)
 758                 match = &dcmi->sd_framesizes[0];
 759
 760         *framesize = *match;
 761 }
 762
 763 static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 764                         const struct dcmi_format **sd_format,
 765                         struct dcmi_framesize *sd_framesize)
 766 {
 767         const struct dcmi_format *sd_fmt;
 768         struct dcmi_framesize sd_fsize;
 769         struct v4l2_pix_format *pix = &f->fmt.pix;
 770         struct v4l2_subdev_pad_config pad_cfg;
 771         struct v4l2_subdev_format format = {
 772                 .which = V4L2_SUBDEV_FORMAT_TRY,
 773         };
 774         int ret;
 775
 776         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
 777         if (!sd_fmt) {
 778                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
 779                 pix->pixelformat = sd_fmt->fourcc;
 780         }
 781
 782         /* Limit to hardware capabilities */
 783         pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
 784         pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
 785
 786         if (dcmi->do_crop && dcmi->num_of_sd_framesizes) {
 787                 struct dcmi_framesize outer_sd_fsize;
 788                 /*
 789                  * If crop is requested and sensor have discrete frame sizes,
 790                  * select the frame size that is just larger than request
 791                  */
 792                 __find_outer_frame_size(dcmi, pix, &outer_sd_fsize);
 793                 pix->width = outer_sd_fsize.width;
 794                 pix->height = outer_sd_fsize.height;
 795         }
 796
 797         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
 798         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, set_fmt,
 799                                &pad_cfg, &format);
 800         if (ret < 0)
 801                 return ret;
 802
 803         /* Update pix regarding to what sensor can do */
 804         v4l2_fill_pix_format(pix, &format.format);
 805
 806         /* Save resolution that sensor can actually do */
 807         sd_fsize.width = pix->width;
 808         sd_fsize.height = pix->height;
 809
 810         if (dcmi->do_crop) {
 811                 struct v4l2_rect c = dcmi->crop;
 812                 struct v4l2_rect max_rect;
 813
 814                 /*
 815                  * Adjust crop by making the intersection between
 816                  * format resolution request and crop request
 817                  */
 818                 max_rect.top = 0;
 819                 max_rect.left = 0;
 820                 max_rect.width = pix->width;
 821                 max_rect.height = pix->height;
 822                 v4l2_rect_map_inside(&c, &max_rect);
 823                 c.top  = clamp_t(s32, c.top, 0, pix->height - c.height);
 824                 c.left = clamp_t(s32, c.left, 0, pix->width - c.width);
 825                 dcmi->crop = c;
 826
 827                 /* Adjust format resolution request to crop */
 828                 pix->width = dcmi->crop.width;
 829                 pix->height = dcmi->crop.height;
 830         }
 831
 832         pix->field = V4L2_FIELD_NONE;
 833         pix->bytesperline = pix->width * sd_fmt->bpp;
 834         pix->sizeimage = pix->bytesperline * pix->height;
 835
 836         if (sd_format)
 837                 *sd_format = sd_fmt;
 838         if (sd_framesize)
 839                 *sd_framesize = sd_fsize;
 840
 841         return 0;
 842 }
 843
 844 static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
 845 {
 846         struct v4l2_subdev_format format = {
 847                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 848         };
 849         const struct dcmi_format *sd_format;
 850         struct dcmi_framesize sd_framesize;
 851         struct v4l2_mbus_framefmt *mf = &format.format;
 852         struct v4l2_pix_format *pix = &f->fmt.pix;
 853         int ret;
 854
 855         /*
 856          * Try format, fmt.width/height could have been changed
 857          * to match sensor capability or crop request
 858          * sd_format & sd_framesize will contain what subdev
 859          * can do for this request.
 860          */
 861         ret = dcmi_try_fmt(dcmi, f, &sd_format, &sd_framesize);
 862         if (ret)
 863                 return ret;
 864
 865         /* pix to mbus format */
 866         v4l2_fill_mbus_format(mf, pix,
 867                               sd_format->mbus_code);
 868         mf->width = sd_framesize.width;
 869         mf->height = sd_framesize.height;
 870
 871         ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
 872                                set_fmt, NULL, &format);
 873         if (ret < 0)
 874                 return ret;
 875
 876         dev_dbg(dcmi->dev, "Sensor format set to 0x%x %ux%u\n",
 877                 mf->code, mf->width, mf->height);
 878         dev_dbg(dcmi->dev, "Buffer format set to %4.4s %ux%u\n",
 879                 (char *)&pix->pixelformat,
 880                 pix->width, pix->height);
 881
 882         dcmi->fmt = *f;
 883         dcmi->sd_format = sd_format;
 884         dcmi->sd_framesize = sd_framesize;
 885
 886         return 0;
 887 }
 888
 889 static int dcmi_s_fmt_vid_cap(struct file *file, void *priv,
 890                               struct v4l2_format *f)
 891 {
 892         struct stm32_dcmi *dcmi = video_drvdata(file);
 893
 894         if (vb2_is_streaming(&dcmi->queue))
 895                 return -EBUSY;
 896
 897         return dcmi_set_fmt(dcmi, f);
 898 }
 899
 900 static int dcmi_try_fmt_vid_cap(struct file *file, void *priv,
 901                                 struct v4l2_format *f)
 902 {
 903         struct stm32_dcmi *dcmi = video_drvdata(file);
 904
 905         return dcmi_try_fmt(dcmi, f, NULL, NULL);
 906 }
 907
 908 static int dcmi_enum_fmt_vid_cap(struct file *file, void  *priv,
 909                                  struct v4l2_fmtdesc *f)
 910 {
 911         struct stm32_dcmi *dcmi = video_drvdata(file);
 912
 913         if (f->index >= dcmi->num_of_sd_formats)
 914                 return -EINVAL;
 915
 916         f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
 917         return 0;
 918 }
 919
 920 static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi,
 921                                   struct v4l2_pix_format *pix)
 922 {
 923         struct v4l2_subdev_format fmt = {
 924                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 925         };
 926         int ret;
 927
 928         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, get_fmt, NULL, &fmt);
 929         if (ret)
 930                 return ret;
 931
 932         v4l2_fill_pix_format(pix, &fmt.format);
 933
 934         return 0;
 935 }
 936
 937 static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
 938                                   struct v4l2_pix_format *pix)
 939 {
 940         const struct dcmi_format *sd_fmt;
 941         struct v4l2_subdev_format format = {
 942                 .which = V4L2_SUBDEV_FORMAT_TRY,
 943         };
 944         struct v4l2_subdev_pad_config pad_cfg;
 945         int ret;
 946
 947         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
 948         if (!sd_fmt) {
 949                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
 950                 pix->pixelformat = sd_fmt->fourcc;
 951         }
 952
 953         v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
 954         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, set_fmt,
 955                                &pad_cfg, &format);
 956         if (ret < 0)
 957                 return ret;
 958
 959         return 0;
 960 }
 961
 962 static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi,
 963                                   struct v4l2_rect *r)
 964 {
 965         struct v4l2_subdev_selection bounds = {
 966                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 967                 .target = V4L2_SEL_TGT_CROP_BOUNDS,
 968         };
 969         unsigned int max_width, max_height, max_pixsize;
 970         struct v4l2_pix_format pix;
 971         unsigned int i;
 972         int ret;
 973
 974         /*
 975          * Get sensor bounds first
 976          */
 977         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, get_selection,
 978                                NULL, &bounds);
 979         if (!ret)
 980                 *r = bounds.r;
 981         if (ret != -ENOIOCTLCMD)
 982                 return ret;
 983
 984         /*
 985          * If selection is not implemented,
 986          * fallback by enumerating sensor frame sizes
 987          * and take the largest one
 988          */
 989         max_width = 0;
 990         max_height = 0;
 991         max_pixsize = 0;
 992         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
 993                 struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
 994                 unsigned int pixsize = fsize->width * fsize->height;
 995
 996                 if (pixsize > max_pixsize) {
 997                         max_pixsize = pixsize;
 998                         max_width = fsize->width;
 999                         max_height = fsize->height;
1000                 }
1001         }
1002         if (max_pixsize > 0) {
1003                 r->top = 0;
1004                 r->left = 0;
1005                 r->width = max_width;
1006                 r->height = max_height;
1007                 return 0;
1008         }
1009
1010         /*
1011          * If frame sizes enumeration is not implemented,
1012          * fallback by getting current sensor frame size
1013          */
1014         ret = dcmi_get_sensor_format(dcmi, &pix);
1015         if (ret)
1016                 return ret;
1017
1018         r->top = 0;
1019         r->left = 0;
1020         r->width = pix.width;
1021         r->height = pix.height;
1022
1023         return 0;
1024 }
1025
1026 static int dcmi_g_selection(struct file *file, void *fh,
1027                             struct v4l2_selection *s)
1028 {
1029         struct stm32_dcmi *dcmi = video_drvdata(file);
1030
1031         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1032                 return -EINVAL;
1033
1034         switch (s->target) {
1035         case V4L2_SEL_TGT_CROP_DEFAULT:
1036         case V4L2_SEL_TGT_CROP_BOUNDS:
1037                 s->r = dcmi->sd_bounds;
1038                 return 0;
1039         case V4L2_SEL_TGT_CROP:
1040                 if (dcmi->do_crop) {
1041                         s->r = dcmi->crop;
1042                 } else {
1043                         s->r.top = 0;
1044                         s->r.left = 0;
1045                         s->r.width = dcmi->fmt.fmt.pix.width;
1046                         s->r.height = dcmi->fmt.fmt.pix.height;
1047                 }
1048                 break;
1049         default:
1050                 return -EINVAL;
1051         }
1052
1053         return 0;
1054 }
1055
1056 static int dcmi_s_selection(struct file *file, void *priv,
1057                             struct v4l2_selection *s)
1058 {
1059         struct stm32_dcmi *dcmi = video_drvdata(file);
1060         struct v4l2_rect r = s->r;
1061         struct v4l2_rect max_rect;
1062         struct v4l2_pix_format pix;
1063
1064         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1065             s->target != V4L2_SEL_TGT_CROP)
1066                 return -EINVAL;
1067
1068         /* Reset sensor resolution to max resolution */
1069         pix.pixelformat = dcmi->fmt.fmt.pix.pixelformat;
1070         pix.width = dcmi->sd_bounds.width;
1071         pix.height = dcmi->sd_bounds.height;
1072         dcmi_set_sensor_format(dcmi, &pix);
1073
1074         /*
1075          * Make the intersection between
1076          * sensor resolution
1077          * and crop request
1078          */
1079         max_rect.top = 0;
1080         max_rect.left = 0;
1081         max_rect.width = pix.width;
1082         max_rect.height = pix.height;
1083         v4l2_rect_map_inside(&r, &max_rect);
1084         r.top  = clamp_t(s32, r.top, 0, pix.height - r.height);
1085         r.left = clamp_t(s32, r.left, 0, pix.width - r.width);
1086
1087         if (!((r.top == dcmi->sd_bounds.top) &&
1088               (r.left == dcmi->sd_bounds.left) &&
1089               (r.width == dcmi->sd_bounds.width) &&
1090               (r.height == dcmi->sd_bounds.height))) {
1091                 /* Crop if request is different than sensor resolution */
1092                 dcmi->do_crop = true;
1093                 dcmi->crop = r;
1094                 dev_dbg(dcmi->dev, "s_selection: crop %ux%u@(%u,%u) from %ux%u\n",
1095                         r.width, r.height, r.left, r.top,
1096                         pix.width, pix.height);
1097         } else {
1098                 /* Disable crop */
1099                 dcmi->do_crop = false;
1100                 dev_dbg(dcmi->dev, "s_selection: crop is disabled\n");
1101         }
1102
1103         s->r = r;
1104         return 0;
1105 }
1106
1107 static int dcmi_querycap(struct file *file, void *priv,
1108                          struct v4l2_capability *cap)
1109 {
1110         strlcpy(cap->driver, DRV_NAME, sizeof(cap->driver));
1111         strlcpy(cap->card, "STM32 Camera Memory Interface",
1112                 sizeof(cap->card));
1113         strlcpy(cap->bus_info, "platform:dcmi", sizeof(cap->bus_info));
1114         return 0;
1115 }
1116
1117 static int dcmi_enum_input(struct file *file, void *priv,
1118                            struct v4l2_input *i)
1119 {
1120         if (i->index != 0)
1121                 return -EINVAL;
1122
1123         i->type = V4L2_INPUT_TYPE_CAMERA;
1124         strlcpy(i->name, "Camera", sizeof(i->name));
1125         return 0;
1126 }
1127
1128 static int dcmi_g_input(struct file *file, void *priv, unsigned int *i)
1129 {
1130         *i = 0;
1131         return 0;
1132 }
1133
1134 static int dcmi_s_input(struct file *file, void *priv, unsigned int i)
1135 {
1136         if (i > 0)
1137                 return -EINVAL;
1138         return 0;
1139 }
1140
1141 static int dcmi_enum_framesizes(struct file *file, void *fh,
1142                                 struct v4l2_frmsizeenum *fsize)
1143 {
1144         struct stm32_dcmi *dcmi = video_drvdata(file);
1145         const struct dcmi_format *sd_fmt;
1146         struct v4l2_subdev_frame_size_enum fse = {
1147                 .index = fsize->index,
1148                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1149         };
1150         int ret;
1151
1152         sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
1153         if (!sd_fmt)
1154                 return -EINVAL;
1155
1156         fse.code = sd_fmt->mbus_code;
1157
1158         ret = v4l2_subdev_call(dcmi->entity.subdev, pad, enum_frame_size,
1159                                NULL, &fse);
1160         if (ret)
1161                 return ret;
1162
1163         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1164         fsize->discrete.width = fse.max_width;
1165         fsize->discrete.height = fse.max_height;
1166
1167         return 0;
1168 }
1169
1170 static int dcmi_enum_frameintervals(struct file *file, void *fh,
1171                                     struct v4l2_frmivalenum *fival)
1172 {
1173         struct stm32_dcmi *dcmi = video_drvdata(file);
1174         const struct dcmi_format *sd_fmt;
1175         struct v4l2_subdev_frame_interval_enum fie = {
1176                 .index = fival->index,
1177                 .width = fival->width,
1178                 .height = fival->height,
1179                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1180         };
1181         int ret;
1182
1183         sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
1184         if (!sd_fmt)
1185                 return -EINVAL;
1186
1187         fie.code = sd_fmt->mbus_code;
1188
1189         ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
1190                                enum_frame_interval, NULL, &fie);
1191         if (ret)
1192                 return ret;
1193
1194         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1195         fival->discrete = fie.interval;
1196
1197         return 0;
1198 }
1199
1200 static const struct of_device_id stm32_dcmi_of_match[] = {
1201         { .compatible = "st,stm32-dcmi"},
1202         { /* end node */ },
1203 };
1204 MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match);
1205
1206 static int dcmi_open(struct file *file)
1207 {
1208         struct stm32_dcmi *dcmi = video_drvdata(file);
1209         struct v4l2_subdev *sd = dcmi->entity.subdev;
1210         int ret;
1211
1212         if (mutex_lock_interruptible(&dcmi->lock))
1213                 return -ERESTARTSYS;
1214
1215         ret = v4l2_fh_open(file);
1216         if (ret < 0)
1217                 goto unlock;
1218
1219         if (!v4l2_fh_is_singular_file(file))
1220                 goto fh_rel;
1221
1222         ret = v4l2_subdev_call(sd, core, s_power, 1);
1223         if (ret < 0 && ret != -ENOIOCTLCMD)
1224                 goto fh_rel;
1225
1226         ret = dcmi_set_fmt(dcmi, &dcmi->fmt);
1227         if (ret)
1228                 v4l2_subdev_call(sd, core, s_power, 0);
1229 fh_rel:
1230         if (ret)
1231                 v4l2_fh_release(file);
1232 unlock:
1233         mutex_unlock(&dcmi->lock);
1234         return ret;
1235 }
1236
1237 static int dcmi_release(struct file *file)
1238 {
1239         struct stm32_dcmi *dcmi = video_drvdata(file);
1240         struct v4l2_subdev *sd = dcmi->entity.subdev;
1241         bool fh_singular;
1242         int ret;
1243
1244         mutex_lock(&dcmi->lock);
1245
1246         fh_singular = v4l2_fh_is_singular_file(file);
1247
1248         ret = _vb2_fop_release(file, NULL);
1249
1250         if (fh_singular)
1251                 v4l2_subdev_call(sd, core, s_power, 0);
1252
1253         mutex_unlock(&dcmi->lock);
1254
1255         return ret;
1256 }
1257
1258 static const struct v4l2_ioctl_ops dcmi_ioctl_ops = {
1259         .vidioc_querycap                = dcmi_querycap,
1260
1261         .vidioc_try_fmt_vid_cap         = dcmi_try_fmt_vid_cap,
1262         .vidioc_g_fmt_vid_cap           = dcmi_g_fmt_vid_cap,
1263         .vidioc_s_fmt_vid_cap           = dcmi_s_fmt_vid_cap,
1264         .vidioc_enum_fmt_vid_cap        = dcmi_enum_fmt_vid_cap,
1265         .vidioc_g_selection             = dcmi_g_selection,
1266         .vidioc_s_selection             = dcmi_s_selection,
1267
1268         .vidioc_enum_input              = dcmi_enum_input,
1269         .vidioc_g_input                 = dcmi_g_input,
1270         .vidioc_s_input                 = dcmi_s_input,
1271
1272         .vidioc_enum_framesizes         = dcmi_enum_framesizes,
1273         .vidioc_enum_frameintervals     = dcmi_enum_frameintervals,
1274
1275         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
1276         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
1277         .vidioc_querybuf                = vb2_ioctl_querybuf,
1278         .vidioc_qbuf                    = vb2_ioctl_qbuf,
1279         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
1280         .vidioc_expbuf                  = vb2_ioctl_expbuf,
1281         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
1282         .vidioc_streamon                = vb2_ioctl_streamon,
1283         .vidioc_streamoff               = vb2_ioctl_streamoff,
1284
1285         .vidioc_log_status              = v4l2_ctrl_log_status,
1286         .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
1287         .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
1288 };
1289
1290 static const struct v4l2_file_operations dcmi_fops = {
1291         .owner          = THIS_MODULE,
1292         .unlocked_ioctl = video_ioctl2,
1293         .open           = dcmi_open,
1294         .release        = dcmi_release,
1295         .poll           = vb2_fop_poll,
1296         .mmap           = vb2_fop_mmap,
1297 #ifndef CONFIG_MMU
1298         .get_unmapped_area = vb2_fop_get_unmapped_area,
1299 #endif
1300         .read           = vb2_fop_read,
1301 };
1302
1303 static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
1304 {
1305         struct v4l2_format f = {
1306                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1307                 .fmt.pix = {
1308                         .width          = CIF_WIDTH,
1309                         .height         = CIF_HEIGHT,
1310                         .field          = V4L2_FIELD_NONE,
1311                         .pixelformat    = dcmi->sd_formats[0]->fourcc,
1312                 },
1313         };
1314         int ret;
1315
1316         ret = dcmi_try_fmt(dcmi, &f, NULL, NULL);
1317         if (ret)
1318                 return ret;
1319         dcmi->sd_format = dcmi->sd_formats[0];
1320         dcmi->fmt = f;
1321         return 0;
1322 }
1323
1324 static const struct dcmi_format dcmi_formats[] = {
1325         {
1326                 .fourcc = V4L2_PIX_FMT_RGB565,
1327                 .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
1328                 .bpp = 2,
1329         }, {
1330                 .fourcc = V4L2_PIX_FMT_YUYV,
1331                 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1332                 .bpp = 2,
1333         }, {
1334                 .fourcc = V4L2_PIX_FMT_UYVY,
1335                 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1336                 .bpp = 2,
1337         },
1338 };
1339
1340 static int dcmi_formats_init(struct stm32_dcmi *dcmi)
1341 {
1342         const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
1343         unsigned int num_fmts = 0, i, j;
1344         struct v4l2_subdev *subdev = dcmi->entity.subdev;
1345         struct v4l2_subdev_mbus_code_enum mbus_code = {
1346                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1347         };
1348
1349         while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1350                                  NULL, &mbus_code)) {
1351                 for (i = 0; i < ARRAY_SIZE(dcmi_formats); i++) {
1352                         if (dcmi_formats[i].mbus_code != mbus_code.code)
1353                                 continue;
1354
1355                         /* Code supported, have we got this fourcc yet? */
1356                         for (j = 0; j < num_fmts; j++)
1357                                 if (sd_fmts[j]->fourcc ==
1358                                                 dcmi_formats[i].fourcc)
1359                                         /* Already available */
1360                                         break;
1361                         if (j == num_fmts)
1362                                 /* New */
1363                                 sd_fmts[num_fmts++] = dcmi_formats + i;
1364                 }
1365                 mbus_code.index++;
1366         }
1367
1368         if (!num_fmts)
1369                 return -ENXIO;
1370
1371         dcmi->num_of_sd_formats = num_fmts;
1372         dcmi->sd_formats = devm_kcalloc(dcmi->dev,
1373                                         num_fmts, sizeof(struct dcmi_format *),
1374                                         GFP_KERNEL);
1375         if (!dcmi->sd_formats) {
1376                 dev_err(dcmi->dev, "Could not allocate memory\n");
1377                 return -ENOMEM;
1378         }
1379
1380         memcpy(dcmi->sd_formats, sd_fmts,
1381                num_fmts * sizeof(struct dcmi_format *));
1382         dcmi->sd_format = dcmi->sd_formats[0];
1383
1384         return 0;
1385 }
1386
1387 static int dcmi_framesizes_init(struct stm32_dcmi *dcmi)
1388 {
1389         unsigned int num_fsize = 0;
1390         struct v4l2_subdev *subdev = dcmi->entity.subdev;
1391         struct v4l2_subdev_frame_size_enum fse = {
1392                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1393                 .code = dcmi->sd_format->mbus_code,
1394         };
1395         unsigned int ret;
1396         unsigned int i;
1397
1398         /* Allocate discrete framesizes array */
1399         while (!v4l2_subdev_call(subdev, pad, enum_frame_size,
1400                                  NULL, &fse))
1401                 fse.index++;
1402
1403         num_fsize = fse.index;
1404         if (!num_fsize)
1405                 return 0;
1406
1407         dcmi->num_of_sd_framesizes = num_fsize;
1408         dcmi->sd_framesizes = devm_kcalloc(dcmi->dev, num_fsize,
1409                                            sizeof(struct dcmi_framesize),
1410                                            GFP_KERNEL);
1411         if (!dcmi->sd_framesizes) {
1412                 dev_err(dcmi->dev, "Could not allocate memory\n");
1413                 return -ENOMEM;
1414         }
1415
1416         /* Fill array with sensor supported framesizes */
1417         dev_dbg(dcmi->dev, "Sensor supports %u frame sizes:\n", num_fsize);
1418         for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
1419                 fse.index = i;
1420                 ret = v4l2_subdev_call(subdev, pad, enum_frame_size,
1421                                        NULL, &fse);
1422                 if (ret)
1423                         return ret;
1424                 dcmi->sd_framesizes[fse.index].width = fse.max_width;
1425                 dcmi->sd_framesizes[fse.index].height = fse.max_height;
1426                 dev_dbg(dcmi->dev, "%ux%u\n", fse.max_width, fse.max_height);
1427         }
1428
1429         return 0;
1430 }
1431
1432 static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1433 {
1434         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1435         int ret;
1436
1437         dcmi->vdev->ctrl_handler = dcmi->entity.subdev->ctrl_handler;
1438         ret = dcmi_formats_init(dcmi);
1439         if (ret) {
1440                 dev_err(dcmi->dev, "No supported mediabus format found\n");
1441                 return ret;
1442         }
1443
1444         ret = dcmi_framesizes_init(dcmi);
1445         if (ret) {
1446                 dev_err(dcmi->dev, "Could not initialize framesizes\n");
1447                 return ret;
1448         }
1449
1450         ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
1451         if (ret) {
1452                 dev_err(dcmi->dev, "Could not get sensor bounds\n");
1453                 return ret;
1454         }
1455
1456         ret = dcmi_set_default_fmt(dcmi);
1457         if (ret) {
1458                 dev_err(dcmi->dev, "Could not set default format\n");
1459                 return ret;
1460         }
1461
1462         ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1);
1463         if (ret) {
1464                 dev_err(dcmi->dev, "Failed to register video device\n");
1465                 return ret;
1466         }
1467
1468         dev_dbg(dcmi->dev, "Device registered as %s\n",
1469                 video_device_node_name(dcmi->vdev));
1470         return 0;
1471 }
1472
1473 static void dcmi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1474                                      struct v4l2_subdev *sd,
1475                                      struct v4l2_async_subdev *asd)
1476 {
1477         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1478
1479         dev_dbg(dcmi->dev, "Removing %s\n", video_device_node_name(dcmi->vdev));
1480
1481         /* Checks internaly if vdev has been init or not */
1482         video_unregister_device(dcmi->vdev);
1483 }
1484
1485 static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1486                                    struct v4l2_subdev *subdev,
1487                                    struct v4l2_async_subdev *asd)
1488 {
1489         struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
1490
1491         dev_dbg(dcmi->dev, "Subdev %s bound\n", subdev->name);
1492
1493         dcmi->entity.subdev = subdev;
1494
1495         return 0;
1496 }
1497
1498 static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = {
1499         .bound = dcmi_graph_notify_bound,
1500         .unbind = dcmi_graph_notify_unbind,
1501         .complete = dcmi_graph_notify_complete,
1502 };
1503
1504 static int dcmi_graph_parse(struct stm32_dcmi *dcmi, struct device_node *node)
1505 {
1506         struct device_node *ep = NULL;
1507         struct device_node *remote;
1508
1509         while (1) {
1510                 ep = of_graph_get_next_endpoint(node, ep);
1511                 if (!ep)
1512                         return -EINVAL;
1513
1514                 remote = of_graph_get_remote_port_parent(ep);
1515                 if (!remote) {
1516                         of_node_put(ep);
1517                         return -EINVAL;
1518                 }
1519
1520                 /* Remote node to connect */
1521                 dcmi->entity.node = remote;
1522                 dcmi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
1523                 dcmi->entity.asd.match.fwnode = of_fwnode_handle(remote);
1524                 return 0;
1525         }
1526 }
1527
1528 static int dcmi_graph_init(struct stm32_dcmi *dcmi)
1529 {
1530         struct v4l2_async_subdev **subdevs = NULL;
1531         int ret;
1532
1533         /* Parse the graph to extract a list of subdevice DT nodes. */
1534         ret = dcmi_graph_parse(dcmi, dcmi->dev->of_node);
1535         if (ret < 0) {
1536                 dev_err(dcmi->dev, "Graph parsing failed\n");
1537                 return ret;
1538         }
1539
1540         /* Register the subdevices notifier. */
1541         subdevs = devm_kzalloc(dcmi->dev, sizeof(*subdevs), GFP_KERNEL);
1542         if (!subdevs) {
1543                 of_node_put(dcmi->entity.node);
1544                 return -ENOMEM;
1545         }
1546
1547         subdevs[0] = &dcmi->entity.asd;
1548
1549         dcmi->notifier.subdevs = subdevs;
1550         dcmi->notifier.num_subdevs = 1;
1551         dcmi->notifier.ops = &dcmi_graph_notify_ops;
1552
1553         ret = v4l2_async_notifier_register(&dcmi->v4l2_dev, &dcmi->notifier);
1554         if (ret < 0) {
1555                 dev_err(dcmi->dev, "Notifier registration failed\n");
1556                 of_node_put(dcmi->entity.node);
1557                 return ret;
1558         }
1559
1560         return 0;
1561 }
1562
1563 static int dcmi_probe(struct platform_device *pdev)
1564 {
1565         struct device_node *np = pdev->dev.of_node;
1566         const struct of_device_id *match = NULL;
1567         struct v4l2_fwnode_endpoint ep;
1568         struct stm32_dcmi *dcmi;
1569         struct vb2_queue *q;
1570         struct dma_chan *chan;
1571         struct clk *mclk;
1572         int irq;
1573         int ret = 0;
1574
1575         match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev);
1576         if (!match) {
1577                 dev_err(&pdev->dev, "Could not find a match in devicetree\n");
1578                 return -ENODEV;
1579         }
1580
1581         dcmi = devm_kzalloc(&pdev->dev, sizeof(struct stm32_dcmi), GFP_KERNEL);
1582         if (!dcmi)
1583                 return -ENOMEM;
1584
1585         dcmi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
1586         if (IS_ERR(dcmi->rstc)) {
1587                 dev_err(&pdev->dev, "Could not get reset control\n");
1588                 return -ENODEV;
1589         }
1590
1591         /* Get bus characteristics from devicetree */
1592         np = of_graph_get_next_endpoint(np, NULL);
1593         if (!np) {
1594                 dev_err(&pdev->dev, "Could not find the endpoint\n");
1595                 of_node_put(np);
1596                 return -ENODEV;
1597         }
1598
1599         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
1600         if (ret) {
1601                 dev_err(&pdev->dev, "Could not parse the endpoint\n");
1602                 of_node_put(np);
1603                 return -ENODEV;
1604         }
1605
1606         if (ep.bus_type == V4L2_MBUS_CSI2) {
1607                 dev_err(&pdev->dev, "CSI bus not supported\n");
1608                 of_node_put(np);
1609                 return -ENODEV;
1610         }
1611         dcmi->bus.flags = ep.bus.parallel.flags;
1612         dcmi->bus.bus_width = ep.bus.parallel.bus_width;
1613         dcmi->bus.data_shift = ep.bus.parallel.data_shift;
1614
1615         of_node_put(np);
1616
1617         irq = platform_get_irq(pdev, 0);
1618         if (irq <= 0) {
1619                 dev_err(&pdev->dev, "Could not get irq\n");
1620                 return -ENODEV;
1621         }
1622
1623         dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1624         if (!dcmi->res) {
1625                 dev_err(&pdev->dev, "Could not get resource\n");
1626                 return -ENODEV;
1627         }
1628
1629         dcmi->regs = devm_ioremap_resource(&pdev->dev, dcmi->res);
1630         if (IS_ERR(dcmi->regs)) {
1631                 dev_err(&pdev->dev, "Could not map registers\n");
1632                 return PTR_ERR(dcmi->regs);
1633         }
1634
1635         ret = devm_request_threaded_irq(&pdev->dev, irq, dcmi_irq_callback,
1636                                         dcmi_irq_thread, IRQF_ONESHOT,
1637                                         dev_name(&pdev->dev), dcmi);
1638         if (ret) {
1639                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1640                 return -ENODEV;
1641         }
1642
1643         mclk = devm_clk_get(&pdev->dev, "mclk");
1644         if (IS_ERR(mclk)) {
1645                 dev_err(&pdev->dev, "Unable to get mclk\n");
1646                 return PTR_ERR(mclk);
1647         }
1648
1649         chan = dma_request_slave_channel(&pdev->dev, "tx");
1650         if (!chan) {
1651                 dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
1652                 return -EPROBE_DEFER;
1653         }
1654
1655         ret = clk_prepare(mclk);
1656         if (ret) {
1657                 dev_err(&pdev->dev, "Unable to prepare mclk %p\n", mclk);
1658                 goto err_dma_release;
1659         }
1660
1661         spin_lock_init(&dcmi->irqlock);
1662         mutex_init(&dcmi->lock);
1663         init_completion(&dcmi->complete);
1664         INIT_LIST_HEAD(&dcmi->buffers);
1665
1666         dcmi->dev = &pdev->dev;
1667         dcmi->mclk = mclk;
1668         dcmi->state = STOPPED;
1669         dcmi->dma_chan = chan;
1670
1671         q = &dcmi->queue;
1672
1673         /* Initialize the top-level structure */
1674         ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
1675         if (ret)
1676                 goto err_clk_unprepare;
1677
1678         dcmi->vdev = video_device_alloc();
1679         if (!dcmi->vdev) {
1680                 ret = -ENOMEM;
1681                 goto err_device_unregister;
1682         }
1683
1684         /* Video node */
1685         dcmi->vdev->fops = &dcmi_fops;
1686         dcmi->vdev->v4l2_dev = &dcmi->v4l2_dev;
1687         dcmi->vdev->queue = &dcmi->queue;
1688         strlcpy(dcmi->vdev->name, KBUILD_MODNAME, sizeof(dcmi->vdev->name));
1689         dcmi->vdev->release = video_device_release;
1690         dcmi->vdev->ioctl_ops = &dcmi_ioctl_ops;
1691         dcmi->vdev->lock = &dcmi->lock;
1692         dcmi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1693                                   V4L2_CAP_READWRITE;
1694         video_set_drvdata(dcmi->vdev, dcmi);
1695
1696         /* Buffer queue */
1697         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1698         q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1699         q->lock = &dcmi->lock;
1700         q->drv_priv = dcmi;
1701         q->buf_struct_size = sizeof(struct dcmi_buf);
1702         q->ops = &dcmi_video_qops;
1703         q->mem_ops = &vb2_dma_contig_memops;
1704         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1705         q->min_buffers_needed = 2;
1706         q->dev = &pdev->dev;
1707
1708         ret = vb2_queue_init(q);
1709         if (ret < 0) {
1710                 dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
1711                 goto err_device_release;
1712         }
1713
1714         ret = dcmi_graph_init(dcmi);
1715         if (ret < 0)
1716                 goto err_device_release;
1717
1718         /* Reset device */
1719         ret = reset_control_assert(dcmi->rstc);
1720         if (ret) {
1721                 dev_err(&pdev->dev, "Failed to assert the reset line\n");
1722                 goto err_device_release;
1723         }
1724
1725         usleep_range(3000, 5000);
1726
1727         ret = reset_control_deassert(dcmi->rstc);
1728         if (ret) {
1729                 dev_err(&pdev->dev, "Failed to deassert the reset line\n");
1730                 goto err_device_release;
1731         }
1732
1733         dev_info(&pdev->dev, "Probe done\n");
1734
1735         platform_set_drvdata(pdev, dcmi);
1736         return 0;
1737
1738 err_device_release:
1739         video_device_release(dcmi->vdev);
1740 err_device_unregister:
1741         v4l2_device_unregister(&dcmi->v4l2_dev);
1742 err_clk_unprepare:
1743         clk_unprepare(dcmi->mclk);
1744 err_dma_release:
1745         dma_release_channel(dcmi->dma_chan);
1746
1747         return ret;
1748 }
1749
1750 static int dcmi_remove(struct platform_device *pdev)
1751 {
1752         struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
1753
1754         v4l2_async_notifier_unregister(&dcmi->notifier);
1755         v4l2_device_unregister(&dcmi->v4l2_dev);
1756         clk_unprepare(dcmi->mclk);
1757         dma_release_channel(dcmi->dma_chan);
1758
1759         return 0;
1760 }
1761
1762 static struct platform_driver stm32_dcmi_driver = {
1763         .probe          = dcmi_probe,
1764         .remove         = dcmi_remove,
1765         .driver         = {
1766                 .name = DRV_NAME,
1767                 .of_match_table = of_match_ptr(stm32_dcmi_of_match),
1768         },
1769 };
1770
1771 module_platform_driver(stm32_dcmi_driver);
1772
1773 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
1774 MODULE_AUTHOR("Hugues Fruchet <hugues.fruchet@st.com>");
1775 MODULE_DESCRIPTION("STMicroelectronics STM32 Digital Camera Memory Interface driver");
1776 MODULE_LICENSE("GPL");
1777 MODULE_SUPPORTED_DEVICE("video");