1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * STM32 DMA2D - 2D Graphics Accelerator Driver 4 * 5 * Copyright (c) 2021 Dillon Min 6 * Dillon Min, <dillon.minfei@gmail.com> 7 * 8 * based on s5p-g2d 9 * 10 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 11 * Kamil Debski, <k.debski@samsung.com> 12 */ 13 14 #include <linux/module.h> 15 #include <linux/fs.h> 16 #include <linux/timer.h> 17 #include <linux/sched.h> 18 #include <linux/slab.h> 19 #include <linux/clk.h> 20 #include <linux/interrupt.h> 21 #include <linux/of.h> 22 23 #include <linux/platform_device.h> 24 #include <media/v4l2-mem2mem.h> 25 #include <media/v4l2-device.h> 26 #include <media/v4l2-ioctl.h> 27 #include <media/v4l2-event.h> 28 #include <media/videobuf2-v4l2.h> 29 #include <media/videobuf2-dma-contig.h> 30 31 #include "dma2d.h" 32 #include "dma2d-regs.h" 33 34 /* 35 * This V4L2 subdev m2m driver enables Chrom-Art Accelerator unit 36 * of STMicroelectronics STM32 SoC series. 37 * 38 * Currently support r2m, m2m, m2m_pfc. 39 * 40 * - r2m, Filling a part or the whole of a destination image with a specific 41 * color. 42 * - m2m, Copying a part or the whole of a source image into a part or the 43 * whole of a destination. 44 * - m2m_pfc, Copying a part or the whole of a source image into a part or the 45 * whole of a destination image with a pixel format conversion. 46 */ 47 48 #define fh2ctx(__fh) container_of(__fh, struct dma2d_ctx, fh) 49 50 static const struct dma2d_fmt formats[] = { 51 { 52 .fourcc = V4L2_PIX_FMT_ARGB32, 53 .cmode = DMA2D_CMODE_ARGB8888, 54 .depth = 32, 55 }, 56 { 57 .fourcc = V4L2_PIX_FMT_RGB24, 58 .cmode = DMA2D_CMODE_RGB888, 59 .depth = 24, 60 }, 61 { 62 .fourcc = V4L2_PIX_FMT_RGB565, 63 .cmode = DMA2D_CMODE_RGB565, 64 .depth = 16, 65 }, 66 { 67 .fourcc = V4L2_PIX_FMT_ARGB555, 68 .cmode = DMA2D_CMODE_ARGB1555, 69 .depth = 16, 70 }, 71 { 72 .fourcc = V4L2_PIX_FMT_ARGB444, 73 .cmode = DMA2D_CMODE_ARGB4444, 74 .depth = 16, 75 }, 76 }; 77 78 #define NUM_FORMATS ARRAY_SIZE(formats) 79 80 static const struct dma2d_frame def_frame = { 81 .width = DEFAULT_WIDTH, 82 .height = DEFAULT_HEIGHT, 83 .line_offset = 0, 84 .a_rgb = {0x00, 0x00, 0x00, 0xff}, 85 .a_mode = DMA2D_ALPHA_MODE_NO_MODIF, 86 .fmt = (struct dma2d_fmt *)&formats[0], 87 .size = DEFAULT_SIZE, 88 }; 89 90 static struct dma2d_fmt *find_fmt(int pixelformat) 91 { 92 unsigned int i; 93 94 for (i = 0; i < NUM_FORMATS; i++) { 95 if (formats[i].fourcc == pixelformat) 96 return (struct dma2d_fmt *)&formats[i]; 97 } 98 99 return NULL; 100 } 101 102 static struct dma2d_frame *get_frame(struct dma2d_ctx *ctx, 103 enum v4l2_buf_type type) 104 { 105 return V4L2_TYPE_IS_OUTPUT(type) ? &ctx->cap : &ctx->out; 106 } 107 108 static int dma2d_queue_setup(struct vb2_queue *vq, 109 unsigned int *nbuffers, unsigned int *nplanes, 110 unsigned int sizes[], struct device *alloc_devs[]) 111 { 112 struct dma2d_ctx *ctx = vb2_get_drv_priv(vq); 113 struct dma2d_frame *f = get_frame(ctx, vq->type); 114 115 if (*nplanes) 116 return sizes[0] < f->size ? -EINVAL : 0; 117 118 sizes[0] = f->size; 119 *nplanes = 1; 120 121 return 0; 122 } 123 124 static int dma2d_buf_out_validate(struct vb2_buffer *vb) 125 { 126 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 127 128 if (vbuf->field == V4L2_FIELD_ANY) 129 vbuf->field = V4L2_FIELD_NONE; 130 if (vbuf->field != V4L2_FIELD_NONE) 131 return -EINVAL; 132 133 return 0; 134 } 135 136 static int dma2d_buf_prepare(struct vb2_buffer *vb) 137 { 138 struct dma2d_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 139 struct dma2d_frame *f = get_frame(ctx, vb->vb2_queue->type); 140 141 if (vb2_plane_size(vb, 0) < f->size) 142 return -EINVAL; 143 144 vb2_set_plane_payload(vb, 0, f->size); 145 146 return 0; 147 } 148 149 static void dma2d_buf_queue(struct vb2_buffer *vb) 150 { 151 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 152 struct dma2d_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); 153 154 v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf); 155 } 156 157 static int dma2d_start_streaming(struct vb2_queue *q, unsigned int count) 158 { 159 struct dma2d_ctx *ctx = vb2_get_drv_priv(q); 160 struct dma2d_frame *f = get_frame(ctx, q->type); 161 162 f->sequence = 0; 163 return 0; 164 } 165 166 static void dma2d_stop_streaming(struct vb2_queue *q) 167 { 168 struct dma2d_ctx *ctx = vb2_get_drv_priv(q); 169 struct vb2_v4l2_buffer *vbuf; 170 171 for (;;) { 172 if (V4L2_TYPE_IS_OUTPUT(q->type)) 173 vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); 174 else 175 vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); 176 if (!vbuf) 177 return; 178 v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR); 179 } 180 } 181 182 static const struct vb2_ops dma2d_qops = { 183 .queue_setup = dma2d_queue_setup, 184 .buf_out_validate = dma2d_buf_out_validate, 185 .buf_prepare = dma2d_buf_prepare, 186 .buf_queue = dma2d_buf_queue, 187 .start_streaming = dma2d_start_streaming, 188 .stop_streaming = dma2d_stop_streaming, 189 .wait_prepare = vb2_ops_wait_prepare, 190 .wait_finish = vb2_ops_wait_finish, 191 }; 192 193 static int queue_init(void *priv, struct vb2_queue *src_vq, 194 struct vb2_queue *dst_vq) 195 { 196 struct dma2d_ctx *ctx = priv; 197 int ret; 198 199 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT; 200 src_vq->io_modes = VB2_MMAP | VB2_DMABUF; 201 src_vq->drv_priv = ctx; 202 src_vq->ops = &dma2d_qops; 203 src_vq->mem_ops = &vb2_dma_contig_memops; 204 src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); 205 src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 206 src_vq->lock = &ctx->dev->mutex; 207 src_vq->dev = ctx->dev->v4l2_dev.dev; 208 209 ret = vb2_queue_init(src_vq); 210 if (ret) 211 return ret; 212 213 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 214 dst_vq->io_modes = VB2_MMAP | VB2_DMABUF; 215 dst_vq->drv_priv = ctx; 216 dst_vq->ops = &dma2d_qops; 217 dst_vq->mem_ops = &vb2_dma_contig_memops; 218 dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer); 219 dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY; 220 dst_vq->lock = &ctx->dev->mutex; 221 dst_vq->dev = ctx->dev->v4l2_dev.dev; 222 223 return vb2_queue_init(dst_vq); 224 } 225 226 static int dma2d_s_ctrl(struct v4l2_ctrl *ctrl) 227 { 228 struct dma2d_frame *frm; 229 struct dma2d_ctx *ctx = container_of(ctrl->handler, struct dma2d_ctx, 230 ctrl_handler); 231 unsigned long flags; 232 233 spin_lock_irqsave(&ctx->dev->ctrl_lock, flags); 234 switch (ctrl->id) { 235 case V4L2_CID_COLORFX: 236 if (ctrl->val == V4L2_COLORFX_SET_RGB) 237 ctx->op_mode = DMA2D_MODE_R2M; 238 else if (ctrl->val == V4L2_COLORFX_NONE) 239 ctx->op_mode = DMA2D_MODE_M2M; 240 break; 241 case V4L2_CID_COLORFX_RGB: 242 frm = get_frame(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); 243 frm->a_rgb[2] = (ctrl->val >> 16) & 0xff; 244 frm->a_rgb[1] = (ctrl->val >> 8) & 0xff; 245 frm->a_rgb[0] = (ctrl->val >> 0) & 0xff; 246 break; 247 default: 248 spin_unlock_irqrestore(&ctx->dev->ctrl_lock, flags); 249 return -EINVAL; 250 } 251 spin_unlock_irqrestore(&ctx->dev->ctrl_lock, flags); 252 253 return 0; 254 } 255 256 static const struct v4l2_ctrl_ops dma2d_ctrl_ops = { 257 .s_ctrl = dma2d_s_ctrl, 258 }; 259 260 static int dma2d_setup_ctrls(struct dma2d_ctx *ctx) 261 { 262 struct v4l2_ctrl_handler *handler = &ctx->ctrl_handler; 263 264 v4l2_ctrl_handler_init(handler, 2); 265 266 v4l2_ctrl_new_std_menu(handler, &dma2d_ctrl_ops, V4L2_CID_COLORFX, 267 V4L2_COLORFX_SET_RGB, ~0x10001, 268 V4L2_COLORFX_NONE); 269 270 v4l2_ctrl_new_std(handler, &dma2d_ctrl_ops, V4L2_CID_COLORFX_RGB, 0, 271 0xffffff, 1, 0); 272 273 return 0; 274 } 275 276 static int dma2d_open(struct file *file) 277 { 278 struct dma2d_dev *dev = video_drvdata(file); 279 struct dma2d_ctx *ctx = NULL; 280 int ret = 0; 281 282 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 283 if (!ctx) 284 return -ENOMEM; 285 ctx->dev = dev; 286 /* Set default formats */ 287 ctx->cap = def_frame; 288 ctx->bg = def_frame; 289 ctx->out = def_frame; 290 ctx->op_mode = DMA2D_MODE_M2M_FPC; 291 ctx->colorspace = V4L2_COLORSPACE_REC709; 292 if (mutex_lock_interruptible(&dev->mutex)) { 293 kfree(ctx); 294 return -ERESTARTSYS; 295 } 296 297 ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init); 298 if (IS_ERR(ctx->fh.m2m_ctx)) { 299 ret = PTR_ERR(ctx->fh.m2m_ctx); 300 mutex_unlock(&dev->mutex); 301 kfree(ctx); 302 return ret; 303 } 304 305 v4l2_fh_init(&ctx->fh, video_devdata(file)); 306 file->private_data = &ctx->fh; 307 v4l2_fh_add(&ctx->fh); 308 309 dma2d_setup_ctrls(ctx); 310 311 /* Write the default values to the ctx struct */ 312 v4l2_ctrl_handler_setup(&ctx->ctrl_handler); 313 314 ctx->fh.ctrl_handler = &ctx->ctrl_handler; 315 mutex_unlock(&dev->mutex); 316 317 return 0; 318 } 319 320 static int dma2d_release(struct file *file) 321 { 322 struct dma2d_dev *dev = video_drvdata(file); 323 struct dma2d_ctx *ctx = fh2ctx(file->private_data); 324 325 mutex_lock(&dev->mutex); 326 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); 327 mutex_unlock(&dev->mutex); 328 v4l2_ctrl_handler_free(&ctx->ctrl_handler); 329 v4l2_fh_del(&ctx->fh); 330 v4l2_fh_exit(&ctx->fh); 331 kfree(ctx); 332 333 return 0; 334 } 335 336 static int vidioc_querycap(struct file *file, void *priv, 337 struct v4l2_capability *cap) 338 { 339 strscpy(cap->driver, DMA2D_NAME, sizeof(cap->driver)); 340 strscpy(cap->card, DMA2D_NAME, sizeof(cap->card)); 341 strscpy(cap->bus_info, BUS_INFO, sizeof(cap->bus_info)); 342 343 return 0; 344 } 345 346 static int vidioc_enum_fmt(struct file *file, void *prv, struct v4l2_fmtdesc *f) 347 { 348 if (f->index >= NUM_FORMATS) 349 return -EINVAL; 350 351 f->pixelformat = formats[f->index].fourcc; 352 return 0; 353 } 354 355 static int vidioc_g_fmt(struct file *file, void *prv, struct v4l2_format *f) 356 { 357 struct dma2d_ctx *ctx = prv; 358 struct vb2_queue *vq; 359 struct dma2d_frame *frm; 360 361 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type); 362 if (!vq) 363 return -EINVAL; 364 365 frm = get_frame(ctx, f->type); 366 f->fmt.pix.width = frm->width; 367 f->fmt.pix.height = frm->height; 368 f->fmt.pix.field = V4L2_FIELD_NONE; 369 f->fmt.pix.pixelformat = frm->fmt->fourcc; 370 f->fmt.pix.bytesperline = (frm->width * frm->fmt->depth) >> 3; 371 f->fmt.pix.sizeimage = frm->size; 372 f->fmt.pix.colorspace = ctx->colorspace; 373 f->fmt.pix.xfer_func = ctx->xfer_func; 374 f->fmt.pix.ycbcr_enc = ctx->ycbcr_enc; 375 f->fmt.pix.quantization = ctx->quant; 376 377 return 0; 378 } 379 380 static int vidioc_try_fmt(struct file *file, void *prv, struct v4l2_format *f) 381 { 382 struct dma2d_ctx *ctx = prv; 383 struct dma2d_fmt *fmt; 384 enum v4l2_field *field; 385 u32 fourcc = f->fmt.pix.pixelformat; 386 387 fmt = find_fmt(fourcc); 388 if (!fmt) { 389 f->fmt.pix.pixelformat = formats[0].fourcc; 390 fmt = find_fmt(f->fmt.pix.pixelformat); 391 } 392 393 field = &f->fmt.pix.field; 394 if (*field == V4L2_FIELD_ANY) 395 *field = V4L2_FIELD_NONE; 396 else if (*field != V4L2_FIELD_NONE) 397 return -EINVAL; 398 399 if (f->fmt.pix.width > MAX_WIDTH) 400 f->fmt.pix.width = MAX_WIDTH; 401 if (f->fmt.pix.height > MAX_HEIGHT) 402 f->fmt.pix.height = MAX_HEIGHT; 403 404 if (f->fmt.pix.width < 1) 405 f->fmt.pix.width = 1; 406 if (f->fmt.pix.height < 1) 407 f->fmt.pix.height = 1; 408 409 if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT && !f->fmt.pix.colorspace) { 410 f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709; 411 } else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { 412 f->fmt.pix.colorspace = ctx->colorspace; 413 f->fmt.pix.xfer_func = ctx->xfer_func; 414 f->fmt.pix.ycbcr_enc = ctx->ycbcr_enc; 415 f->fmt.pix.quantization = ctx->quant; 416 } 417 f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3; 418 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 419 420 return 0; 421 } 422 423 static int vidioc_s_fmt(struct file *file, void *prv, struct v4l2_format *f) 424 { 425 struct dma2d_ctx *ctx = prv; 426 struct vb2_queue *vq; 427 struct dma2d_frame *frm; 428 struct dma2d_fmt *fmt; 429 int ret = 0; 430 431 /* Adjust all values accordingly to the hardware capabilities 432 * and chosen format. 433 */ 434 ret = vidioc_try_fmt(file, prv, f); 435 if (ret) 436 return ret; 437 438 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type); 439 if (vb2_is_busy(vq)) 440 return -EBUSY; 441 442 fmt = find_fmt(f->fmt.pix.pixelformat); 443 if (!fmt) 444 return -EINVAL; 445 446 if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) { 447 ctx->colorspace = f->fmt.pix.colorspace; 448 ctx->xfer_func = f->fmt.pix.xfer_func; 449 ctx->ycbcr_enc = f->fmt.pix.ycbcr_enc; 450 ctx->quant = f->fmt.pix.quantization; 451 } 452 453 frm = get_frame(ctx, f->type); 454 frm->width = f->fmt.pix.width; 455 frm->height = f->fmt.pix.height; 456 frm->size = f->fmt.pix.sizeimage; 457 /* Reset crop settings */ 458 frm->o_width = 0; 459 frm->o_height = 0; 460 frm->c_width = frm->width; 461 frm->c_height = frm->height; 462 frm->right = frm->width; 463 frm->bottom = frm->height; 464 frm->fmt = fmt; 465 frm->line_offset = 0; 466 467 return 0; 468 } 469 470 static void device_run(void *prv) 471 { 472 struct dma2d_ctx *ctx = prv; 473 struct dma2d_dev *dev = ctx->dev; 474 struct dma2d_frame *frm_out, *frm_cap; 475 struct vb2_v4l2_buffer *src, *dst; 476 unsigned long flags; 477 478 spin_lock_irqsave(&dev->ctrl_lock, flags); 479 dev->curr = ctx; 480 481 src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx); 482 dst = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx); 483 if (!dst || !src) 484 goto end; 485 486 frm_cap = get_frame(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); 487 frm_out = get_frame(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); 488 if (!frm_cap || !frm_out) 489 goto end; 490 491 src->sequence = frm_out->sequence++; 492 dst->sequence = frm_cap->sequence++; 493 v4l2_m2m_buf_copy_metadata(src, dst, true); 494 495 clk_enable(dev->gate); 496 497 dma2d_config_fg(dev, frm_out, 498 vb2_dma_contig_plane_dma_addr(&src->vb2_buf, 0)); 499 500 /* TODO: add M2M_BLEND handler here */ 501 502 if (ctx->op_mode != DMA2D_MODE_R2M) { 503 if (frm_out->fmt->fourcc == frm_cap->fmt->fourcc) 504 ctx->op_mode = DMA2D_MODE_M2M; 505 else 506 ctx->op_mode = DMA2D_MODE_M2M_FPC; 507 } 508 509 dma2d_config_out(dev, frm_cap, 510 vb2_dma_contig_plane_dma_addr(&dst->vb2_buf, 0)); 511 dma2d_config_common(dev, ctx->op_mode, frm_cap->width, frm_cap->height); 512 513 dma2d_start(dev); 514 end: 515 spin_unlock_irqrestore(&dev->ctrl_lock, flags); 516 } 517 518 static irqreturn_t dma2d_isr(int irq, void *prv) 519 { 520 struct dma2d_dev *dev = prv; 521 struct dma2d_ctx *ctx = dev->curr; 522 struct vb2_v4l2_buffer *src, *dst; 523 u32 s = dma2d_get_int(dev); 524 525 dma2d_clear_int(dev); 526 if (s & ISR_TCIF || s == 0) { 527 clk_disable(dev->gate); 528 529 WARN_ON(!ctx); 530 531 src = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); 532 dst = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); 533 534 WARN_ON(!dst); 535 WARN_ON(!src); 536 537 v4l2_m2m_buf_done(src, VB2_BUF_STATE_DONE); 538 v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE); 539 v4l2_m2m_job_finish(dev->m2m_dev, ctx->fh.m2m_ctx); 540 541 dev->curr = NULL; 542 } 543 544 return IRQ_HANDLED; 545 } 546 547 static const struct v4l2_file_operations dma2d_fops = { 548 .owner = THIS_MODULE, 549 .open = dma2d_open, 550 .release = dma2d_release, 551 .poll = v4l2_m2m_fop_poll, 552 .unlocked_ioctl = video_ioctl2, 553 .mmap = v4l2_m2m_fop_mmap, 554 #ifndef CONFIG_MMU 555 .get_unmapped_area = v4l2_m2m_get_unmapped_area, 556 #endif 557 }; 558 559 static const struct v4l2_ioctl_ops dma2d_ioctl_ops = { 560 .vidioc_querycap = vidioc_querycap, 561 562 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt, 563 .vidioc_g_fmt_vid_cap = vidioc_g_fmt, 564 .vidioc_try_fmt_vid_cap = vidioc_try_fmt, 565 .vidioc_s_fmt_vid_cap = vidioc_s_fmt, 566 567 .vidioc_enum_fmt_vid_out = vidioc_enum_fmt, 568 .vidioc_g_fmt_vid_out = vidioc_g_fmt, 569 .vidioc_try_fmt_vid_out = vidioc_try_fmt, 570 .vidioc_s_fmt_vid_out = vidioc_s_fmt, 571 572 .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs, 573 .vidioc_querybuf = v4l2_m2m_ioctl_querybuf, 574 .vidioc_qbuf = v4l2_m2m_ioctl_qbuf, 575 .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf, 576 .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf, 577 .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs, 578 .vidioc_expbuf = v4l2_m2m_ioctl_expbuf, 579 580 .vidioc_streamon = v4l2_m2m_ioctl_streamon, 581 .vidioc_streamoff = v4l2_m2m_ioctl_streamoff, 582 583 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 584 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 585 }; 586 587 static const struct video_device dma2d_videodev = { 588 .name = DMA2D_NAME, 589 .fops = &dma2d_fops, 590 .ioctl_ops = &dma2d_ioctl_ops, 591 .minor = -1, 592 .release = video_device_release, 593 .vfl_dir = VFL_DIR_M2M, 594 }; 595 596 static const struct v4l2_m2m_ops dma2d_m2m_ops = { 597 .device_run = device_run, 598 }; 599 600 static const struct of_device_id stm32_dma2d_match[]; 601 602 static int dma2d_probe(struct platform_device *pdev) 603 { 604 struct dma2d_dev *dev; 605 struct video_device *vfd; 606 struct resource *res; 607 int ret = 0; 608 609 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 610 if (!dev) 611 return -ENOMEM; 612 613 spin_lock_init(&dev->ctrl_lock); 614 mutex_init(&dev->mutex); 615 atomic_set(&dev->num_inst, 0); 616 617 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 618 619 dev->regs = devm_ioremap_resource(&pdev->dev, res); 620 if (IS_ERR(dev->regs)) 621 return PTR_ERR(dev->regs); 622 623 dev->gate = clk_get(&pdev->dev, "dma2d"); 624 if (IS_ERR(dev->gate)) { 625 dev_err(&pdev->dev, "failed to get dma2d clock gate\n"); 626 ret = -ENXIO; 627 return ret; 628 } 629 630 ret = clk_prepare(dev->gate); 631 if (ret) { 632 dev_err(&pdev->dev, "failed to prepare dma2d clock gate\n"); 633 goto put_clk_gate; 634 } 635 636 ret = platform_get_irq(pdev, 0); 637 if (ret < 0) 638 goto unprep_clk_gate; 639 640 dev->irq = ret; 641 642 ret = devm_request_irq(&pdev->dev, dev->irq, dma2d_isr, 643 0, pdev->name, dev); 644 if (ret) { 645 dev_err(&pdev->dev, "failed to install IRQ\n"); 646 goto unprep_clk_gate; 647 } 648 649 ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev); 650 if (ret) 651 goto unprep_clk_gate; 652 653 vfd = video_device_alloc(); 654 if (!vfd) { 655 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n"); 656 ret = -ENOMEM; 657 goto unreg_v4l2_dev; 658 } 659 660 *vfd = dma2d_videodev; 661 vfd->lock = &dev->mutex; 662 vfd->v4l2_dev = &dev->v4l2_dev; 663 vfd->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING; 664 665 platform_set_drvdata(pdev, dev); 666 dev->m2m_dev = v4l2_m2m_init(&dma2d_m2m_ops); 667 if (IS_ERR(dev->m2m_dev)) { 668 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n"); 669 ret = PTR_ERR(dev->m2m_dev); 670 goto rel_vdev; 671 } 672 673 ret = video_register_device(vfd, VFL_TYPE_VIDEO, 0); 674 if (ret) { 675 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n"); 676 goto free_m2m; 677 } 678 679 video_set_drvdata(vfd, dev); 680 dev->vfd = vfd; 681 v4l2_info(&dev->v4l2_dev, "device registered as /dev/video%d\n", 682 vfd->num); 683 return 0; 684 685 free_m2m: 686 v4l2_m2m_release(dev->m2m_dev); 687 rel_vdev: 688 video_device_release(vfd); 689 unreg_v4l2_dev: 690 v4l2_device_unregister(&dev->v4l2_dev); 691 unprep_clk_gate: 692 clk_unprepare(dev->gate); 693 put_clk_gate: 694 clk_put(dev->gate); 695 696 return ret; 697 } 698 699 static int dma2d_remove(struct platform_device *pdev) 700 { 701 struct dma2d_dev *dev = platform_get_drvdata(pdev); 702 703 v4l2_info(&dev->v4l2_dev, "Removing " DMA2D_NAME); 704 v4l2_m2m_release(dev->m2m_dev); 705 video_unregister_device(dev->vfd); 706 v4l2_device_unregister(&dev->v4l2_dev); 707 vb2_dma_contig_clear_max_seg_size(&pdev->dev); 708 clk_unprepare(dev->gate); 709 clk_put(dev->gate); 710 711 return 0; 712 } 713 714 static const struct of_device_id stm32_dma2d_match[] = { 715 { 716 .compatible = "st,stm32-dma2d", 717 .data = NULL, 718 }, 719 {}, 720 }; 721 MODULE_DEVICE_TABLE(of, stm32_dma2d_match); 722 723 static struct platform_driver dma2d_pdrv = { 724 .probe = dma2d_probe, 725 .remove = dma2d_remove, 726 .driver = { 727 .name = DMA2D_NAME, 728 .of_match_table = stm32_dma2d_match, 729 }, 730 }; 731 732 module_platform_driver(dma2d_pdrv); 733 734 MODULE_AUTHOR("Dillon Min <dillon.minfei@gmail.com>"); 735 MODULE_DESCRIPTION("STM32 Chrom-Art Accelerator DMA2D driver"); 736 MODULE_LICENSE("GPL"); 737