1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Driver for Renesas RZ/G2L CRU 4 * 5 * Copyright (C) 2022 Renesas Electronics Corp. 6 * 7 * Based on Renesas R-Car VIN 8 * Copyright (C) 2016 Renesas Electronics Corp. 9 * Copyright (C) 2011-2013 Renesas Solutions Corp. 10 * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com> 11 * Copyright (C) 2008 Magnus Damm 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/delay.h> 16 #include <linux/pm_runtime.h> 17 18 #include <media/v4l2-ioctl.h> 19 #include <media/videobuf2-dma-contig.h> 20 21 #include "rzg2l-cru.h" 22 23 /* HW CRU Registers Definition */ 24 25 /* CRU Control Register */ 26 #define CRUnCTRL 0x0 27 #define CRUnCTRL_VINSEL(x) ((x) << 0) 28 29 /* CRU Interrupt Enable Register */ 30 #define CRUnIE 0x4 31 #define CRUnIE_EFE BIT(17) 32 33 /* CRU Interrupt Status Register */ 34 #define CRUnINTS 0x8 35 #define CRUnINTS_SFS BIT(16) 36 37 /* CRU Reset Register */ 38 #define CRUnRST 0xc 39 #define CRUnRST_VRESETN BIT(0) 40 41 /* Memory Bank Base Address (Lower) Register for CRU Image Data */ 42 #define AMnMBxADDRL(x) (0x100 + ((x) * 8)) 43 44 /* Memory Bank Base Address (Higher) Register for CRU Image Data */ 45 #define AMnMBxADDRH(x) (0x104 + ((x) * 8)) 46 47 /* Memory Bank Enable Register for CRU Image Data */ 48 #define AMnMBVALID 0x148 49 #define AMnMBVALID_MBVALID(x) GENMASK(x, 0) 50 51 /* Memory Bank Status Register for CRU Image Data */ 52 #define AMnMBS 0x14c 53 #define AMnMBS_MBSTS 0x7 54 55 /* AXI Master FIFO Pointer Register for CRU Image Data */ 56 #define AMnFIFOPNTR 0x168 57 #define AMnFIFOPNTR_FIFOWPNTR GENMASK(7, 0) 58 #define AMnFIFOPNTR_FIFORPNTR_Y GENMASK(23, 16) 59 60 /* AXI Master Transfer Stop Register for CRU Image Data */ 61 #define AMnAXISTP 0x174 62 #define AMnAXISTP_AXI_STOP BIT(0) 63 64 /* AXI Master Transfer Stop Status Register for CRU Image Data */ 65 #define AMnAXISTPACK 0x178 66 #define AMnAXISTPACK_AXI_STOP_ACK BIT(0) 67 68 /* CRU Image Processing Enable Register */ 69 #define ICnEN 0x200 70 #define ICnEN_ICEN BIT(0) 71 72 /* CRU Image Processing Main Control Register */ 73 #define ICnMC 0x208 74 #define ICnMC_CSCTHR BIT(5) 75 #define ICnMC_INF_YUV8_422 (0x1e << 16) 76 #define ICnMC_INF_USER (0x30 << 16) 77 #define ICnMC_VCSEL(x) ((x) << 22) 78 #define ICnMC_INF_MASK GENMASK(21, 16) 79 80 /* CRU Module Status Register */ 81 #define ICnMS 0x254 82 #define ICnMS_IA BIT(2) 83 84 /* CRU Data Output Mode Register */ 85 #define ICnDMR 0x26c 86 #define ICnDMR_YCMODE_UYVY (1 << 4) 87 88 #define RZG2L_TIMEOUT_MS 100 89 #define RZG2L_RETRIES 10 90 91 #define RZG2L_CRU_DEFAULT_FORMAT V4L2_PIX_FMT_UYVY 92 #define RZG2L_CRU_DEFAULT_WIDTH RZG2L_CRU_MIN_INPUT_WIDTH 93 #define RZG2L_CRU_DEFAULT_HEIGHT RZG2L_CRU_MIN_INPUT_HEIGHT 94 #define RZG2L_CRU_DEFAULT_FIELD V4L2_FIELD_NONE 95 #define RZG2L_CRU_DEFAULT_COLORSPACE V4L2_COLORSPACE_SRGB 96 97 struct rzg2l_cru_buffer { 98 struct vb2_v4l2_buffer vb; 99 struct list_head list; 100 }; 101 102 #define to_buf_list(vb2_buffer) \ 103 (&container_of(vb2_buffer, struct rzg2l_cru_buffer, vb)->list) 104 105 /* ----------------------------------------------------------------------------- 106 * DMA operations 107 */ 108 static void rzg2l_cru_write(struct rzg2l_cru_dev *cru, u32 offset, u32 value) 109 { 110 iowrite32(value, cru->base + offset); 111 } 112 113 static u32 rzg2l_cru_read(struct rzg2l_cru_dev *cru, u32 offset) 114 { 115 return ioread32(cru->base + offset); 116 } 117 118 /* Need to hold qlock before calling */ 119 static void return_unused_buffers(struct rzg2l_cru_dev *cru, 120 enum vb2_buffer_state state) 121 { 122 struct rzg2l_cru_buffer *buf, *node; 123 unsigned long flags; 124 unsigned int i; 125 126 spin_lock_irqsave(&cru->qlock, flags); 127 for (i = 0; i < cru->num_buf; i++) { 128 if (cru->queue_buf[i]) { 129 vb2_buffer_done(&cru->queue_buf[i]->vb2_buf, 130 state); 131 cru->queue_buf[i] = NULL; 132 } 133 } 134 135 list_for_each_entry_safe(buf, node, &cru->buf_list, list) { 136 vb2_buffer_done(&buf->vb.vb2_buf, state); 137 list_del(&buf->list); 138 } 139 spin_unlock_irqrestore(&cru->qlock, flags); 140 } 141 142 static int rzg2l_cru_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers, 143 unsigned int *nplanes, unsigned int sizes[], 144 struct device *alloc_devs[]) 145 { 146 struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq); 147 148 /* Make sure the image size is large enough. */ 149 if (*nplanes) 150 return sizes[0] < cru->format.sizeimage ? -EINVAL : 0; 151 152 *nplanes = 1; 153 sizes[0] = cru->format.sizeimage; 154 155 return 0; 156 }; 157 158 static int rzg2l_cru_buffer_prepare(struct vb2_buffer *vb) 159 { 160 struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vb->vb2_queue); 161 unsigned long size = cru->format.sizeimage; 162 163 if (vb2_plane_size(vb, 0) < size) { 164 dev_err(cru->dev, "buffer too small (%lu < %lu)\n", 165 vb2_plane_size(vb, 0), size); 166 return -EINVAL; 167 } 168 169 vb2_set_plane_payload(vb, 0, size); 170 171 return 0; 172 } 173 174 static void rzg2l_cru_buffer_queue(struct vb2_buffer *vb) 175 { 176 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 177 struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vb->vb2_queue); 178 unsigned long flags; 179 180 spin_lock_irqsave(&cru->qlock, flags); 181 182 list_add_tail(to_buf_list(vbuf), &cru->buf_list); 183 184 spin_unlock_irqrestore(&cru->qlock, flags); 185 } 186 187 static int rzg2l_cru_mc_validate_format(struct rzg2l_cru_dev *cru, 188 struct v4l2_subdev *sd, 189 struct media_pad *pad) 190 { 191 struct v4l2_subdev_format fmt = { 192 .which = V4L2_SUBDEV_FORMAT_ACTIVE, 193 }; 194 195 fmt.pad = pad->index; 196 if (v4l2_subdev_call_state_active(sd, pad, get_fmt, &fmt)) 197 return -EPIPE; 198 199 switch (fmt.format.code) { 200 case MEDIA_BUS_FMT_UYVY8_1X16: 201 break; 202 default: 203 return -EPIPE; 204 } 205 206 switch (fmt.format.field) { 207 case V4L2_FIELD_TOP: 208 case V4L2_FIELD_BOTTOM: 209 case V4L2_FIELD_NONE: 210 case V4L2_FIELD_INTERLACED_TB: 211 case V4L2_FIELD_INTERLACED_BT: 212 case V4L2_FIELD_INTERLACED: 213 case V4L2_FIELD_SEQ_TB: 214 case V4L2_FIELD_SEQ_BT: 215 break; 216 default: 217 return -EPIPE; 218 } 219 220 if (fmt.format.width != cru->format.width || 221 fmt.format.height != cru->format.height) 222 return -EPIPE; 223 224 return 0; 225 } 226 227 static void rzg2l_cru_set_slot_addr(struct rzg2l_cru_dev *cru, 228 int slot, dma_addr_t addr) 229 { 230 /* 231 * The address needs to be 512 bytes aligned. Driver should never accept 232 * settings that do not satisfy this in the first place... 233 */ 234 if (WARN_ON((addr) & RZG2L_CRU_HW_BUFFER_MASK)) 235 return; 236 237 /* Currently, we just use the buffer in 32 bits address */ 238 rzg2l_cru_write(cru, AMnMBxADDRL(slot), addr); 239 rzg2l_cru_write(cru, AMnMBxADDRH(slot), 0); 240 } 241 242 /* 243 * Moves a buffer from the queue to the HW slot. If no buffer is 244 * available use the scratch buffer. The scratch buffer is never 245 * returned to userspace, its only function is to enable the capture 246 * loop to keep running. 247 */ 248 static void rzg2l_cru_fill_hw_slot(struct rzg2l_cru_dev *cru, int slot) 249 { 250 struct vb2_v4l2_buffer *vbuf; 251 struct rzg2l_cru_buffer *buf; 252 dma_addr_t phys_addr; 253 254 /* A already populated slot shall never be overwritten. */ 255 if (WARN_ON(cru->queue_buf[slot])) 256 return; 257 258 dev_dbg(cru->dev, "Filling HW slot: %d\n", slot); 259 260 if (list_empty(&cru->buf_list)) { 261 cru->queue_buf[slot] = NULL; 262 phys_addr = cru->scratch_phys; 263 } else { 264 /* Keep track of buffer we give to HW */ 265 buf = list_entry(cru->buf_list.next, 266 struct rzg2l_cru_buffer, list); 267 vbuf = &buf->vb; 268 list_del_init(to_buf_list(vbuf)); 269 cru->queue_buf[slot] = vbuf; 270 271 /* Setup DMA */ 272 phys_addr = vb2_dma_contig_plane_dma_addr(&vbuf->vb2_buf, 0); 273 } 274 275 rzg2l_cru_set_slot_addr(cru, slot, phys_addr); 276 } 277 278 static void rzg2l_cru_initialize_axi(struct rzg2l_cru_dev *cru) 279 { 280 unsigned int slot; 281 282 /* 283 * Set image data memory banks. 284 * Currently, we will use maximum address. 285 */ 286 rzg2l_cru_write(cru, AMnMBVALID, AMnMBVALID_MBVALID(cru->num_buf - 1)); 287 288 for (slot = 0; slot < cru->num_buf; slot++) 289 rzg2l_cru_fill_hw_slot(cru, slot); 290 } 291 292 static void rzg2l_cru_csi2_setup(struct rzg2l_cru_dev *cru, bool *input_is_yuv, 293 struct v4l2_mbus_framefmt *ip_sd_fmt) 294 { 295 u32 icnmc; 296 297 switch (ip_sd_fmt->code) { 298 case MEDIA_BUS_FMT_UYVY8_1X16: 299 icnmc = ICnMC_INF_YUV8_422; 300 *input_is_yuv = true; 301 break; 302 default: 303 *input_is_yuv = false; 304 icnmc = ICnMC_INF_USER; 305 break; 306 } 307 308 icnmc |= (rzg2l_cru_read(cru, ICnMC) & ~ICnMC_INF_MASK); 309 310 /* Set virtual channel CSI2 */ 311 icnmc |= ICnMC_VCSEL(cru->csi.channel); 312 313 rzg2l_cru_write(cru, ICnMC, icnmc); 314 } 315 316 static int rzg2l_cru_initialize_image_conv(struct rzg2l_cru_dev *cru, 317 struct v4l2_mbus_framefmt *ip_sd_fmt) 318 { 319 bool output_is_yuv = false; 320 bool input_is_yuv = false; 321 u32 icndmr; 322 323 rzg2l_cru_csi2_setup(cru, &input_is_yuv, ip_sd_fmt); 324 325 /* Output format */ 326 switch (cru->format.pixelformat) { 327 case V4L2_PIX_FMT_UYVY: 328 icndmr = ICnDMR_YCMODE_UYVY; 329 output_is_yuv = true; 330 break; 331 default: 332 dev_err(cru->dev, "Invalid pixelformat (0x%x)\n", 333 cru->format.pixelformat); 334 return -EINVAL; 335 } 336 337 /* If input and output use same colorspace, do bypass mode */ 338 if (output_is_yuv == input_is_yuv) 339 rzg2l_cru_write(cru, ICnMC, 340 rzg2l_cru_read(cru, ICnMC) | ICnMC_CSCTHR); 341 else 342 rzg2l_cru_write(cru, ICnMC, 343 rzg2l_cru_read(cru, ICnMC) & (~ICnMC_CSCTHR)); 344 345 /* Set output data format */ 346 rzg2l_cru_write(cru, ICnDMR, icndmr); 347 348 return 0; 349 } 350 351 void rzg2l_cru_stop_image_processing(struct rzg2l_cru_dev *cru) 352 { 353 u32 amnfifopntr, amnfifopntr_w, amnfifopntr_r_y; 354 unsigned int retries = 0; 355 unsigned long flags; 356 u32 icnms; 357 358 spin_lock_irqsave(&cru->qlock, flags); 359 360 /* Disable and clear the interrupt */ 361 rzg2l_cru_write(cru, CRUnIE, 0); 362 rzg2l_cru_write(cru, CRUnINTS, 0x001F0F0F); 363 364 /* Stop the operation of image conversion */ 365 rzg2l_cru_write(cru, ICnEN, 0); 366 367 /* Wait for streaming to stop */ 368 while ((rzg2l_cru_read(cru, ICnMS) & ICnMS_IA) && retries++ < RZG2L_RETRIES) { 369 spin_unlock_irqrestore(&cru->qlock, flags); 370 msleep(RZG2L_TIMEOUT_MS); 371 spin_lock_irqsave(&cru->qlock, flags); 372 } 373 374 icnms = rzg2l_cru_read(cru, ICnMS) & ICnMS_IA; 375 if (icnms) 376 dev_err(cru->dev, "Failed stop HW, something is seriously broken\n"); 377 378 cru->state = RZG2L_CRU_DMA_STOPPED; 379 380 /* Wait until the FIFO becomes empty */ 381 for (retries = 5; retries > 0; retries--) { 382 amnfifopntr = rzg2l_cru_read(cru, AMnFIFOPNTR); 383 384 amnfifopntr_w = amnfifopntr & AMnFIFOPNTR_FIFOWPNTR; 385 amnfifopntr_r_y = 386 (amnfifopntr & AMnFIFOPNTR_FIFORPNTR_Y) >> 16; 387 if (amnfifopntr_w == amnfifopntr_r_y) 388 break; 389 390 usleep_range(10, 20); 391 } 392 393 /* Notify that FIFO is not empty here */ 394 if (!retries) 395 dev_err(cru->dev, "Failed to empty FIFO\n"); 396 397 /* Stop AXI bus */ 398 rzg2l_cru_write(cru, AMnAXISTP, AMnAXISTP_AXI_STOP); 399 400 /* Wait until the AXI bus stop */ 401 for (retries = 5; retries > 0; retries--) { 402 if (rzg2l_cru_read(cru, AMnAXISTPACK) & 403 AMnAXISTPACK_AXI_STOP_ACK) 404 break; 405 406 usleep_range(10, 20); 407 }; 408 409 /* Notify that AXI bus can not stop here */ 410 if (!retries) 411 dev_err(cru->dev, "Failed to stop AXI bus\n"); 412 413 /* Cancel the AXI bus stop request */ 414 rzg2l_cru_write(cru, AMnAXISTP, 0); 415 416 /* Reset the CRU (AXI-master) */ 417 reset_control_assert(cru->aresetn); 418 419 /* Resets the image processing module */ 420 rzg2l_cru_write(cru, CRUnRST, 0); 421 422 spin_unlock_irqrestore(&cru->qlock, flags); 423 } 424 425 int rzg2l_cru_start_image_processing(struct rzg2l_cru_dev *cru) 426 { 427 struct v4l2_mbus_framefmt *fmt = rzg2l_cru_ip_get_src_fmt(cru); 428 unsigned long flags; 429 int ret; 430 431 spin_lock_irqsave(&cru->qlock, flags); 432 433 /* Initialize image convert */ 434 ret = rzg2l_cru_initialize_image_conv(cru, fmt); 435 if (ret) { 436 spin_unlock_irqrestore(&cru->qlock, flags); 437 return ret; 438 } 439 440 /* Select a video input */ 441 rzg2l_cru_write(cru, CRUnCTRL, CRUnCTRL_VINSEL(0)); 442 443 /* Cancel the software reset for image processing block */ 444 rzg2l_cru_write(cru, CRUnRST, CRUnRST_VRESETN); 445 446 /* Disable and clear the interrupt before using */ 447 rzg2l_cru_write(cru, CRUnIE, 0); 448 rzg2l_cru_write(cru, CRUnINTS, 0x001f000f); 449 450 /* Initialize the AXI master */ 451 rzg2l_cru_initialize_axi(cru); 452 453 /* Enable interrupt */ 454 rzg2l_cru_write(cru, CRUnIE, CRUnIE_EFE); 455 456 /* Enable image processing reception */ 457 rzg2l_cru_write(cru, ICnEN, ICnEN_ICEN); 458 459 spin_unlock_irqrestore(&cru->qlock, flags); 460 461 return 0; 462 } 463 464 void rzg2l_cru_vclk_unprepare(struct rzg2l_cru_dev *cru) 465 { 466 clk_disable_unprepare(cru->vclk); 467 } 468 469 int rzg2l_cru_vclk_prepare(struct rzg2l_cru_dev *cru) 470 { 471 return clk_prepare_enable(cru->vclk); 472 } 473 474 static int rzg2l_cru_set_stream(struct rzg2l_cru_dev *cru, int on) 475 { 476 struct media_pipeline *pipe; 477 struct v4l2_subdev *sd; 478 struct media_pad *pad; 479 int ret; 480 481 pad = media_pad_remote_pad_first(&cru->pad); 482 if (!pad) 483 return -EPIPE; 484 485 sd = media_entity_to_v4l2_subdev(pad->entity); 486 487 if (!on) { 488 int stream_off_ret = 0; 489 490 ret = v4l2_subdev_call(sd, video, s_stream, 0); 491 if (ret) 492 stream_off_ret = ret; 493 494 ret = v4l2_subdev_call(sd, video, post_streamoff); 495 if (ret == -ENOIOCTLCMD) 496 ret = 0; 497 if (ret && !stream_off_ret) 498 stream_off_ret = ret; 499 500 video_device_pipeline_stop(&cru->vdev); 501 502 pm_runtime_put_sync(cru->dev); 503 clk_disable_unprepare(cru->vclk); 504 505 return stream_off_ret; 506 } 507 508 ret = pm_runtime_resume_and_get(cru->dev); 509 if (ret) 510 return ret; 511 512 ret = clk_prepare_enable(cru->vclk); 513 if (ret) 514 goto err_pm_put; 515 516 ret = rzg2l_cru_mc_validate_format(cru, sd, pad); 517 if (ret) 518 goto err_vclk_disable; 519 520 pipe = media_entity_pipeline(&sd->entity) ? : &cru->vdev.pipe; 521 ret = video_device_pipeline_start(&cru->vdev, pipe); 522 if (ret) 523 goto err_vclk_disable; 524 525 ret = v4l2_subdev_call(sd, video, pre_streamon, 0); 526 if (ret == -ENOIOCTLCMD) 527 ret = 0; 528 if (ret) 529 goto pipe_line_stop; 530 531 ret = v4l2_subdev_call(sd, video, s_stream, 1); 532 if (ret == -ENOIOCTLCMD) 533 ret = 0; 534 if (ret) 535 goto err_s_stream; 536 537 return 0; 538 539 err_s_stream: 540 v4l2_subdev_call(sd, video, post_streamoff); 541 542 pipe_line_stop: 543 video_device_pipeline_stop(&cru->vdev); 544 545 err_vclk_disable: 546 clk_disable_unprepare(cru->vclk); 547 548 err_pm_put: 549 pm_runtime_put_sync(cru->dev); 550 551 return ret; 552 } 553 554 static void rzg2l_cru_stop_streaming(struct rzg2l_cru_dev *cru) 555 { 556 cru->state = RZG2L_CRU_DMA_STOPPING; 557 558 rzg2l_cru_set_stream(cru, 0); 559 } 560 561 static irqreturn_t rzg2l_cru_irq(int irq, void *data) 562 { 563 struct rzg2l_cru_dev *cru = data; 564 unsigned int handled = 0; 565 unsigned long flags; 566 u32 irq_status; 567 u32 amnmbs; 568 int slot; 569 570 spin_lock_irqsave(&cru->qlock, flags); 571 572 irq_status = rzg2l_cru_read(cru, CRUnINTS); 573 if (!irq_status) 574 goto done; 575 576 handled = 1; 577 578 rzg2l_cru_write(cru, CRUnINTS, rzg2l_cru_read(cru, CRUnINTS)); 579 580 /* Nothing to do if capture status is 'RZG2L_CRU_DMA_STOPPED' */ 581 if (cru->state == RZG2L_CRU_DMA_STOPPED) { 582 dev_dbg(cru->dev, "IRQ while state stopped\n"); 583 goto done; 584 } 585 586 /* Increase stop retries if capture status is 'RZG2L_CRU_DMA_STOPPING' */ 587 if (cru->state == RZG2L_CRU_DMA_STOPPING) { 588 if (irq_status & CRUnINTS_SFS) 589 dev_dbg(cru->dev, "IRQ while state stopping\n"); 590 goto done; 591 } 592 593 /* Prepare for capture and update state */ 594 amnmbs = rzg2l_cru_read(cru, AMnMBS); 595 slot = amnmbs & AMnMBS_MBSTS; 596 597 /* 598 * AMnMBS.MBSTS indicates the destination of Memory Bank (MB). 599 * Recalculate to get the current transfer complete MB. 600 */ 601 if (slot == 0) 602 slot = cru->num_buf - 1; 603 else 604 slot--; 605 606 /* 607 * To hand buffers back in a known order to userspace start 608 * to capture first from slot 0. 609 */ 610 if (cru->state == RZG2L_CRU_DMA_STARTING) { 611 if (slot != 0) { 612 dev_dbg(cru->dev, "Starting sync slot: %d\n", slot); 613 goto done; 614 } 615 616 dev_dbg(cru->dev, "Capture start synced!\n"); 617 cru->state = RZG2L_CRU_DMA_RUNNING; 618 } 619 620 /* Capture frame */ 621 if (cru->queue_buf[slot]) { 622 cru->queue_buf[slot]->field = cru->format.field; 623 cru->queue_buf[slot]->sequence = cru->sequence; 624 cru->queue_buf[slot]->vb2_buf.timestamp = ktime_get_ns(); 625 vb2_buffer_done(&cru->queue_buf[slot]->vb2_buf, 626 VB2_BUF_STATE_DONE); 627 cru->queue_buf[slot] = NULL; 628 } else { 629 /* Scratch buffer was used, dropping frame. */ 630 dev_dbg(cru->dev, "Dropping frame %u\n", cru->sequence); 631 } 632 633 cru->sequence++; 634 635 /* Prepare for next frame */ 636 rzg2l_cru_fill_hw_slot(cru, slot); 637 638 done: 639 spin_unlock_irqrestore(&cru->qlock, flags); 640 641 return IRQ_RETVAL(handled); 642 } 643 644 static int rzg2l_cru_start_streaming_vq(struct vb2_queue *vq, unsigned int count) 645 { 646 struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq); 647 int ret; 648 649 /* Release reset state */ 650 ret = reset_control_deassert(cru->aresetn); 651 if (ret) { 652 dev_err(cru->dev, "failed to deassert aresetn\n"); 653 return ret; 654 } 655 656 ret = reset_control_deassert(cru->presetn); 657 if (ret) { 658 reset_control_assert(cru->aresetn); 659 dev_err(cru->dev, "failed to deassert presetn\n"); 660 return ret; 661 } 662 663 ret = request_irq(cru->image_conv_irq, rzg2l_cru_irq, 664 IRQF_SHARED, KBUILD_MODNAME, cru); 665 if (ret) { 666 dev_err(cru->dev, "failed to request irq\n"); 667 goto assert_resets; 668 } 669 670 /* Allocate scratch buffer. */ 671 cru->scratch = dma_alloc_coherent(cru->dev, cru->format.sizeimage, 672 &cru->scratch_phys, GFP_KERNEL); 673 if (!cru->scratch) { 674 return_unused_buffers(cru, VB2_BUF_STATE_QUEUED); 675 dev_err(cru->dev, "Failed to allocate scratch buffer\n"); 676 ret = -ENOMEM; 677 goto free_image_conv_irq; 678 } 679 680 cru->sequence = 0; 681 682 ret = rzg2l_cru_set_stream(cru, 1); 683 if (ret) { 684 return_unused_buffers(cru, VB2_BUF_STATE_QUEUED); 685 goto out; 686 } 687 688 cru->state = RZG2L_CRU_DMA_STARTING; 689 dev_dbg(cru->dev, "Starting to capture\n"); 690 return 0; 691 692 out: 693 if (ret) 694 dma_free_coherent(cru->dev, cru->format.sizeimage, cru->scratch, 695 cru->scratch_phys); 696 free_image_conv_irq: 697 free_irq(cru->image_conv_irq, cru); 698 699 assert_resets: 700 reset_control_assert(cru->presetn); 701 reset_control_assert(cru->aresetn); 702 703 return ret; 704 } 705 706 static void rzg2l_cru_stop_streaming_vq(struct vb2_queue *vq) 707 { 708 struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq); 709 710 rzg2l_cru_stop_streaming(cru); 711 712 /* Free scratch buffer */ 713 dma_free_coherent(cru->dev, cru->format.sizeimage, 714 cru->scratch, cru->scratch_phys); 715 716 free_irq(cru->image_conv_irq, cru); 717 reset_control_assert(cru->presetn); 718 719 return_unused_buffers(cru, VB2_BUF_STATE_ERROR); 720 } 721 722 static const struct vb2_ops rzg2l_cru_qops = { 723 .queue_setup = rzg2l_cru_queue_setup, 724 .buf_prepare = rzg2l_cru_buffer_prepare, 725 .buf_queue = rzg2l_cru_buffer_queue, 726 .start_streaming = rzg2l_cru_start_streaming_vq, 727 .stop_streaming = rzg2l_cru_stop_streaming_vq, 728 .wait_prepare = vb2_ops_wait_prepare, 729 .wait_finish = vb2_ops_wait_finish, 730 }; 731 732 void rzg2l_cru_dma_unregister(struct rzg2l_cru_dev *cru) 733 { 734 mutex_destroy(&cru->lock); 735 736 v4l2_device_unregister(&cru->v4l2_dev); 737 vb2_queue_release(&cru->queue); 738 } 739 740 int rzg2l_cru_dma_register(struct rzg2l_cru_dev *cru) 741 { 742 struct vb2_queue *q = &cru->queue; 743 unsigned int i; 744 int ret; 745 746 /* Initialize the top-level structure */ 747 ret = v4l2_device_register(cru->dev, &cru->v4l2_dev); 748 if (ret) 749 return ret; 750 751 mutex_init(&cru->lock); 752 INIT_LIST_HEAD(&cru->buf_list); 753 754 spin_lock_init(&cru->qlock); 755 756 cru->state = RZG2L_CRU_DMA_STOPPED; 757 758 for (i = 0; i < RZG2L_CRU_HW_BUFFER_MAX; i++) 759 cru->queue_buf[i] = NULL; 760 761 /* buffer queue */ 762 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 763 q->io_modes = VB2_MMAP | VB2_DMABUF; 764 q->lock = &cru->lock; 765 q->drv_priv = cru; 766 q->buf_struct_size = sizeof(struct rzg2l_cru_buffer); 767 q->ops = &rzg2l_cru_qops; 768 q->mem_ops = &vb2_dma_contig_memops; 769 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 770 q->min_buffers_needed = 4; 771 q->dev = cru->dev; 772 773 ret = vb2_queue_init(q); 774 if (ret < 0) { 775 dev_err(cru->dev, "failed to initialize VB2 queue\n"); 776 goto error; 777 } 778 779 return 0; 780 781 error: 782 mutex_destroy(&cru->lock); 783 v4l2_device_unregister(&cru->v4l2_dev); 784 return ret; 785 } 786 787 /* ----------------------------------------------------------------------------- 788 * V4L2 stuff 789 */ 790 791 static const struct v4l2_format_info rzg2l_cru_formats[] = { 792 { 793 .format = V4L2_PIX_FMT_UYVY, 794 .bpp[0] = 2, 795 }, 796 }; 797 798 const struct v4l2_format_info *rzg2l_cru_format_from_pixel(u32 format) 799 { 800 unsigned int i; 801 802 for (i = 0; i < ARRAY_SIZE(rzg2l_cru_formats); i++) 803 if (rzg2l_cru_formats[i].format == format) 804 return rzg2l_cru_formats + i; 805 806 return NULL; 807 } 808 809 static u32 rzg2l_cru_format_bytesperline(struct v4l2_pix_format *pix) 810 { 811 const struct v4l2_format_info *fmt; 812 813 fmt = rzg2l_cru_format_from_pixel(pix->pixelformat); 814 815 if (WARN_ON(!fmt)) 816 return -EINVAL; 817 818 return pix->width * fmt->bpp[0]; 819 } 820 821 static u32 rzg2l_cru_format_sizeimage(struct v4l2_pix_format *pix) 822 { 823 return pix->bytesperline * pix->height; 824 } 825 826 static void rzg2l_cru_format_align(struct rzg2l_cru_dev *cru, 827 struct v4l2_pix_format *pix) 828 { 829 if (!rzg2l_cru_format_from_pixel(pix->pixelformat)) 830 pix->pixelformat = RZG2L_CRU_DEFAULT_FORMAT; 831 832 switch (pix->field) { 833 case V4L2_FIELD_TOP: 834 case V4L2_FIELD_BOTTOM: 835 case V4L2_FIELD_NONE: 836 case V4L2_FIELD_INTERLACED_TB: 837 case V4L2_FIELD_INTERLACED_BT: 838 case V4L2_FIELD_INTERLACED: 839 break; 840 default: 841 pix->field = RZG2L_CRU_DEFAULT_FIELD; 842 break; 843 } 844 845 /* Limit to CRU capabilities */ 846 v4l_bound_align_image(&pix->width, 320, RZG2L_CRU_MAX_INPUT_WIDTH, 1, 847 &pix->height, 240, RZG2L_CRU_MAX_INPUT_HEIGHT, 2, 0); 848 849 pix->bytesperline = rzg2l_cru_format_bytesperline(pix); 850 pix->sizeimage = rzg2l_cru_format_sizeimage(pix); 851 852 dev_dbg(cru->dev, "Format %ux%u bpl: %u size: %u\n", 853 pix->width, pix->height, pix->bytesperline, pix->sizeimage); 854 } 855 856 static void rzg2l_cru_try_format(struct rzg2l_cru_dev *cru, 857 struct v4l2_pix_format *pix) 858 { 859 /* 860 * The V4L2 specification clearly documents the colorspace fields 861 * as being set by drivers for capture devices. Using the values 862 * supplied by userspace thus wouldn't comply with the API. Until 863 * the API is updated force fixed values. 864 */ 865 pix->colorspace = RZG2L_CRU_DEFAULT_COLORSPACE; 866 pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace); 867 pix->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace); 868 pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true, pix->colorspace, 869 pix->ycbcr_enc); 870 871 rzg2l_cru_format_align(cru, pix); 872 } 873 874 static int rzg2l_cru_querycap(struct file *file, void *priv, 875 struct v4l2_capability *cap) 876 { 877 strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver)); 878 strscpy(cap->card, "RZG2L_CRU", sizeof(cap->card)); 879 880 return 0; 881 } 882 883 static int rzg2l_cru_try_fmt_vid_cap(struct file *file, void *priv, 884 struct v4l2_format *f) 885 { 886 struct rzg2l_cru_dev *cru = video_drvdata(file); 887 888 rzg2l_cru_try_format(cru, &f->fmt.pix); 889 890 return 0; 891 } 892 893 static int rzg2l_cru_s_fmt_vid_cap(struct file *file, void *priv, 894 struct v4l2_format *f) 895 { 896 struct rzg2l_cru_dev *cru = video_drvdata(file); 897 898 if (vb2_is_busy(&cru->queue)) 899 return -EBUSY; 900 901 rzg2l_cru_try_format(cru, &f->fmt.pix); 902 903 cru->format = f->fmt.pix; 904 905 return 0; 906 } 907 908 static int rzg2l_cru_g_fmt_vid_cap(struct file *file, void *priv, 909 struct v4l2_format *f) 910 { 911 struct rzg2l_cru_dev *cru = video_drvdata(file); 912 913 f->fmt.pix = cru->format; 914 915 return 0; 916 } 917 918 static int rzg2l_cru_enum_fmt_vid_cap(struct file *file, void *priv, 919 struct v4l2_fmtdesc *f) 920 { 921 if (f->index >= ARRAY_SIZE(rzg2l_cru_formats)) 922 return -EINVAL; 923 924 f->pixelformat = rzg2l_cru_formats[f->index].format; 925 926 return 0; 927 } 928 929 static const struct v4l2_ioctl_ops rzg2l_cru_ioctl_ops = { 930 .vidioc_querycap = rzg2l_cru_querycap, 931 .vidioc_try_fmt_vid_cap = rzg2l_cru_try_fmt_vid_cap, 932 .vidioc_g_fmt_vid_cap = rzg2l_cru_g_fmt_vid_cap, 933 .vidioc_s_fmt_vid_cap = rzg2l_cru_s_fmt_vid_cap, 934 .vidioc_enum_fmt_vid_cap = rzg2l_cru_enum_fmt_vid_cap, 935 936 .vidioc_reqbufs = vb2_ioctl_reqbufs, 937 .vidioc_create_bufs = vb2_ioctl_create_bufs, 938 .vidioc_querybuf = vb2_ioctl_querybuf, 939 .vidioc_qbuf = vb2_ioctl_qbuf, 940 .vidioc_dqbuf = vb2_ioctl_dqbuf, 941 .vidioc_expbuf = vb2_ioctl_expbuf, 942 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 943 .vidioc_streamon = vb2_ioctl_streamon, 944 .vidioc_streamoff = vb2_ioctl_streamoff, 945 }; 946 947 /* ----------------------------------------------------------------------------- 948 * Media controller file operations 949 */ 950 951 static int rzg2l_cru_open(struct file *file) 952 { 953 struct rzg2l_cru_dev *cru = video_drvdata(file); 954 int ret; 955 956 ret = mutex_lock_interruptible(&cru->lock); 957 if (ret) 958 return ret; 959 960 file->private_data = cru; 961 ret = v4l2_fh_open(file); 962 if (ret) 963 goto err_unlock; 964 965 mutex_unlock(&cru->lock); 966 967 return 0; 968 969 err_unlock: 970 mutex_unlock(&cru->lock); 971 972 return ret; 973 } 974 975 static int rzg2l_cru_release(struct file *file) 976 { 977 struct rzg2l_cru_dev *cru = video_drvdata(file); 978 int ret; 979 980 mutex_lock(&cru->lock); 981 982 /* the release helper will cleanup any on-going streaming. */ 983 ret = _vb2_fop_release(file, NULL); 984 985 mutex_unlock(&cru->lock); 986 987 return ret; 988 } 989 990 static const struct v4l2_file_operations rzg2l_cru_fops = { 991 .owner = THIS_MODULE, 992 .unlocked_ioctl = video_ioctl2, 993 .open = rzg2l_cru_open, 994 .release = rzg2l_cru_release, 995 .poll = vb2_fop_poll, 996 .mmap = vb2_fop_mmap, 997 .read = vb2_fop_read, 998 }; 999 1000 static void rzg2l_cru_v4l2_init(struct rzg2l_cru_dev *cru) 1001 { 1002 struct video_device *vdev = &cru->vdev; 1003 1004 vdev->v4l2_dev = &cru->v4l2_dev; 1005 vdev->queue = &cru->queue; 1006 snprintf(vdev->name, sizeof(vdev->name), "CRU output"); 1007 vdev->release = video_device_release_empty; 1008 vdev->lock = &cru->lock; 1009 vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; 1010 vdev->device_caps |= V4L2_CAP_IO_MC; 1011 vdev->fops = &rzg2l_cru_fops; 1012 vdev->ioctl_ops = &rzg2l_cru_ioctl_ops; 1013 1014 /* Set a default format */ 1015 cru->format.pixelformat = RZG2L_CRU_DEFAULT_FORMAT; 1016 cru->format.width = RZG2L_CRU_DEFAULT_WIDTH; 1017 cru->format.height = RZG2L_CRU_DEFAULT_HEIGHT; 1018 cru->format.field = RZG2L_CRU_DEFAULT_FIELD; 1019 cru->format.colorspace = RZG2L_CRU_DEFAULT_COLORSPACE; 1020 rzg2l_cru_format_align(cru, &cru->format); 1021 } 1022 1023 void rzg2l_cru_video_unregister(struct rzg2l_cru_dev *cru) 1024 { 1025 media_device_unregister(&cru->mdev); 1026 video_unregister_device(&cru->vdev); 1027 } 1028 1029 int rzg2l_cru_video_register(struct rzg2l_cru_dev *cru) 1030 { 1031 struct video_device *vdev = &cru->vdev; 1032 int ret; 1033 1034 if (video_is_registered(&cru->vdev)) { 1035 struct media_entity *entity; 1036 1037 entity = &cru->vdev.entity; 1038 if (!entity->graph_obj.mdev) 1039 entity->graph_obj.mdev = &cru->mdev; 1040 return 0; 1041 } 1042 1043 rzg2l_cru_v4l2_init(cru); 1044 video_set_drvdata(vdev, cru); 1045 ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1); 1046 if (ret) { 1047 dev_err(cru->dev, "Failed to register video device\n"); 1048 return ret; 1049 } 1050 1051 ret = media_device_register(&cru->mdev); 1052 if (ret) { 1053 video_unregister_device(&cru->vdev); 1054 return ret; 1055 } 1056 1057 return 0; 1058 } 1059