1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2020 NVIDIA CORPORATION. All rights reserved. 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/clk/tegra.h> 8 #include <linux/device.h> 9 #include <linux/host1x.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/of_graph.h> 13 #include <linux/of_device.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm_runtime.h> 16 17 #include <media/v4l2-fwnode.h> 18 19 #include "csi.h" 20 #include "video.h" 21 22 #define MHZ 1000000 23 24 static inline struct tegra_csi * 25 host1x_client_to_csi(struct host1x_client *client) 26 { 27 return container_of(client, struct tegra_csi, client); 28 } 29 30 static inline struct tegra_csi_channel *to_csi_chan(struct v4l2_subdev *subdev) 31 { 32 return container_of(subdev, struct tegra_csi_channel, subdev); 33 } 34 35 /* 36 * CSI is a separate subdevice which has 6 source pads to generate 37 * test pattern. CSI subdevice pad ops are used only for TPG and 38 * allows below TPG formats. 39 */ 40 static const struct v4l2_mbus_framefmt tegra_csi_tpg_fmts[] = { 41 { 42 TEGRA_DEF_WIDTH, 43 TEGRA_DEF_HEIGHT, 44 MEDIA_BUS_FMT_SRGGB10_1X10, 45 V4L2_FIELD_NONE, 46 V4L2_COLORSPACE_SRGB 47 }, 48 { 49 TEGRA_DEF_WIDTH, 50 TEGRA_DEF_HEIGHT, 51 MEDIA_BUS_FMT_RGB888_1X32_PADHI, 52 V4L2_FIELD_NONE, 53 V4L2_COLORSPACE_SRGB 54 }, 55 }; 56 57 static const struct v4l2_frmsize_discrete tegra_csi_tpg_sizes[] = { 58 { 1280, 720 }, 59 { 1920, 1080 }, 60 { 3840, 2160 }, 61 }; 62 63 /* 64 * V4L2 Subdevice Pad Operations 65 */ 66 static int csi_enum_bus_code(struct v4l2_subdev *subdev, 67 struct v4l2_subdev_pad_config *cfg, 68 struct v4l2_subdev_mbus_code_enum *code) 69 { 70 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 71 return -ENOIOCTLCMD; 72 73 if (code->index >= ARRAY_SIZE(tegra_csi_tpg_fmts)) 74 return -EINVAL; 75 76 code->code = tegra_csi_tpg_fmts[code->index].code; 77 78 return 0; 79 } 80 81 static int csi_get_format(struct v4l2_subdev *subdev, 82 struct v4l2_subdev_pad_config *cfg, 83 struct v4l2_subdev_format *fmt) 84 { 85 struct tegra_csi_channel *csi_chan = to_csi_chan(subdev); 86 87 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 88 return -ENOIOCTLCMD; 89 90 fmt->format = csi_chan->format; 91 92 return 0; 93 } 94 95 static int csi_get_frmrate_table_index(struct tegra_csi *csi, u32 code, 96 u32 width, u32 height) 97 { 98 const struct tpg_framerate *frmrate; 99 unsigned int i; 100 101 frmrate = csi->soc->tpg_frmrate_table; 102 for (i = 0; i < csi->soc->tpg_frmrate_table_size; i++) { 103 if (frmrate[i].code == code && 104 frmrate[i].frmsize.width == width && 105 frmrate[i].frmsize.height == height) { 106 return i; 107 } 108 } 109 110 return -EINVAL; 111 } 112 113 static void csi_chan_update_blank_intervals(struct tegra_csi_channel *csi_chan, 114 u32 code, u32 width, u32 height) 115 { 116 struct tegra_csi *csi = csi_chan->csi; 117 const struct tpg_framerate *frmrate = csi->soc->tpg_frmrate_table; 118 int index; 119 120 index = csi_get_frmrate_table_index(csi_chan->csi, code, 121 width, height); 122 if (index >= 0) { 123 csi_chan->h_blank = frmrate[index].h_blank; 124 csi_chan->v_blank = frmrate[index].v_blank; 125 csi_chan->framerate = frmrate[index].framerate; 126 } 127 } 128 129 static int csi_enum_framesizes(struct v4l2_subdev *subdev, 130 struct v4l2_subdev_pad_config *cfg, 131 struct v4l2_subdev_frame_size_enum *fse) 132 { 133 unsigned int i; 134 135 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 136 return -ENOIOCTLCMD; 137 138 if (fse->index >= ARRAY_SIZE(tegra_csi_tpg_sizes)) 139 return -EINVAL; 140 141 for (i = 0; i < ARRAY_SIZE(tegra_csi_tpg_fmts); i++) 142 if (fse->code == tegra_csi_tpg_fmts[i].code) 143 break; 144 145 if (i == ARRAY_SIZE(tegra_csi_tpg_fmts)) 146 return -EINVAL; 147 148 fse->min_width = tegra_csi_tpg_sizes[fse->index].width; 149 fse->max_width = tegra_csi_tpg_sizes[fse->index].width; 150 fse->min_height = tegra_csi_tpg_sizes[fse->index].height; 151 fse->max_height = tegra_csi_tpg_sizes[fse->index].height; 152 153 return 0; 154 } 155 156 static int csi_enum_frameintervals(struct v4l2_subdev *subdev, 157 struct v4l2_subdev_pad_config *cfg, 158 struct v4l2_subdev_frame_interval_enum *fie) 159 { 160 struct tegra_csi_channel *csi_chan = to_csi_chan(subdev); 161 struct tegra_csi *csi = csi_chan->csi; 162 const struct tpg_framerate *frmrate = csi->soc->tpg_frmrate_table; 163 int index; 164 165 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 166 return -ENOIOCTLCMD; 167 168 /* one framerate per format and resolution */ 169 if (fie->index > 0) 170 return -EINVAL; 171 172 index = csi_get_frmrate_table_index(csi_chan->csi, fie->code, 173 fie->width, fie->height); 174 if (index < 0) 175 return -EINVAL; 176 177 fie->interval.numerator = 1; 178 fie->interval.denominator = frmrate[index].framerate; 179 180 return 0; 181 } 182 183 static int csi_set_format(struct v4l2_subdev *subdev, 184 struct v4l2_subdev_pad_config *cfg, 185 struct v4l2_subdev_format *fmt) 186 { 187 struct tegra_csi_channel *csi_chan = to_csi_chan(subdev); 188 struct v4l2_mbus_framefmt *format = &fmt->format; 189 const struct v4l2_frmsize_discrete *sizes; 190 unsigned int i; 191 192 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 193 return -ENOIOCTLCMD; 194 195 sizes = v4l2_find_nearest_size(tegra_csi_tpg_sizes, 196 ARRAY_SIZE(tegra_csi_tpg_sizes), 197 width, height, 198 format->width, format->width); 199 format->width = sizes->width; 200 format->height = sizes->height; 201 202 for (i = 0; i < ARRAY_SIZE(tegra_csi_tpg_fmts); i++) 203 if (format->code == tegra_csi_tpg_fmts[i].code) 204 break; 205 206 if (i == ARRAY_SIZE(tegra_csi_tpg_fmts)) 207 i = 0; 208 209 format->code = tegra_csi_tpg_fmts[i].code; 210 format->field = V4L2_FIELD_NONE; 211 212 if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) 213 return 0; 214 215 /* update blanking intervals from frame rate table and format */ 216 csi_chan_update_blank_intervals(csi_chan, format->code, 217 format->width, format->height); 218 csi_chan->format = *format; 219 220 return 0; 221 } 222 223 /* 224 * V4L2 Subdevice Video Operations 225 */ 226 static int tegra_csi_g_frame_interval(struct v4l2_subdev *subdev, 227 struct v4l2_subdev_frame_interval *vfi) 228 { 229 struct tegra_csi_channel *csi_chan = to_csi_chan(subdev); 230 231 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 232 return -ENOIOCTLCMD; 233 234 vfi->interval.numerator = 1; 235 vfi->interval.denominator = csi_chan->framerate; 236 237 return 0; 238 } 239 240 static unsigned int csi_get_pixel_rate(struct tegra_csi_channel *csi_chan) 241 { 242 struct tegra_vi_channel *chan; 243 struct v4l2_subdev *src_subdev; 244 struct v4l2_ctrl *ctrl; 245 246 chan = v4l2_get_subdev_hostdata(&csi_chan->subdev); 247 src_subdev = tegra_channel_get_remote_source_subdev(chan); 248 ctrl = v4l2_ctrl_find(src_subdev->ctrl_handler, V4L2_CID_PIXEL_RATE); 249 if (ctrl) 250 return v4l2_ctrl_g_ctrl_int64(ctrl); 251 252 return 0; 253 } 254 255 void tegra_csi_calc_settle_time(struct tegra_csi_channel *csi_chan, 256 u8 *clk_settle_time, 257 u8 *ths_settle_time) 258 { 259 struct tegra_csi *csi = csi_chan->csi; 260 unsigned int cil_clk_mhz; 261 unsigned int pix_clk_mhz; 262 int clk_idx = (csi_chan->csi_port_num >> 1) + 1; 263 264 cil_clk_mhz = clk_get_rate(csi->clks[clk_idx].clk) / MHZ; 265 pix_clk_mhz = csi_get_pixel_rate(csi_chan) / MHZ; 266 267 /* 268 * CLK Settle time is the interval during which HS receiver should 269 * ignore any clock lane HS transitions, starting from the beginning 270 * of T-CLK-PREPARE. 271 * Per DPHY specification, T-CLK-SETTLE should be between 95ns ~ 300ns 272 * 273 * 95ns < (clk-settle-programmed + 7) * lp clk period < 300ns 274 * midpoint = 197.5 ns 275 */ 276 *clk_settle_time = ((95 + 300) * cil_clk_mhz - 14000) / 2000; 277 278 /* 279 * THS Settle time is the interval during which HS receiver should 280 * ignore any data lane HS transitions, starting from the beginning 281 * of THS-PREPARE. 282 * 283 * Per DPHY specification, T-HS-SETTLE should be between 85ns + 6UI 284 * and 145ns+10UI. 285 * 85ns + 6UI < (Ths-settle-prog + 5) * lp_clk_period < 145ns + 10UI 286 * midpoint = 115ns + 8UI 287 */ 288 if (pix_clk_mhz) 289 *ths_settle_time = (115 * cil_clk_mhz + 8000 * cil_clk_mhz 290 / (2 * pix_clk_mhz) - 5000) / 1000; 291 } 292 293 static int tegra_csi_enable_stream(struct v4l2_subdev *subdev) 294 { 295 struct tegra_vi_channel *chan = v4l2_get_subdev_hostdata(subdev); 296 struct tegra_csi_channel *csi_chan = to_csi_chan(subdev); 297 struct tegra_csi *csi = csi_chan->csi; 298 int ret, err; 299 300 ret = pm_runtime_get_sync(csi->dev); 301 if (ret < 0) { 302 dev_err(csi->dev, "failed to get runtime PM: %d\n", ret); 303 pm_runtime_put_noidle(csi->dev); 304 return ret; 305 } 306 307 if (csi_chan->mipi) { 308 ret = tegra_mipi_enable(csi_chan->mipi); 309 if (ret < 0) { 310 dev_err(csi->dev, 311 "failed to enable MIPI pads: %d\n", ret); 312 goto rpm_put; 313 } 314 315 /* 316 * CSI MIPI pads PULLUP, PULLDN and TERM impedances need to 317 * be calibrated after power on. 318 * So, trigger the calibration start here and results will 319 * be latched and applied to the pads when link is in LP11 320 * state during start of sensor streaming. 321 */ 322 ret = tegra_mipi_start_calibration(csi_chan->mipi); 323 if (ret < 0) { 324 dev_err(csi->dev, 325 "failed to start MIPI calibration: %d\n", ret); 326 goto disable_mipi; 327 } 328 } 329 330 csi_chan->pg_mode = chan->pg_mode; 331 ret = csi->ops->csi_start_streaming(csi_chan); 332 if (ret < 0) 333 goto finish_calibration; 334 335 return 0; 336 337 finish_calibration: 338 if (csi_chan->mipi) 339 tegra_mipi_finish_calibration(csi_chan->mipi); 340 disable_mipi: 341 if (csi_chan->mipi) { 342 err = tegra_mipi_disable(csi_chan->mipi); 343 if (err < 0) 344 dev_err(csi->dev, 345 "failed to disable MIPI pads: %d\n", err); 346 } 347 348 rpm_put: 349 pm_runtime_put(csi->dev); 350 return ret; 351 } 352 353 static int tegra_csi_disable_stream(struct v4l2_subdev *subdev) 354 { 355 struct tegra_csi_channel *csi_chan = to_csi_chan(subdev); 356 struct tegra_csi *csi = csi_chan->csi; 357 int err; 358 359 csi->ops->csi_stop_streaming(csi_chan); 360 361 if (csi_chan->mipi) { 362 err = tegra_mipi_disable(csi_chan->mipi); 363 if (err < 0) 364 dev_err(csi->dev, 365 "failed to disable MIPI pads: %d\n", err); 366 } 367 368 pm_runtime_put(csi->dev); 369 370 return 0; 371 } 372 373 static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable) 374 { 375 int ret; 376 377 if (enable) 378 ret = tegra_csi_enable_stream(subdev); 379 else 380 ret = tegra_csi_disable_stream(subdev); 381 382 return ret; 383 } 384 385 /* 386 * V4L2 Subdevice Operations 387 */ 388 static const struct v4l2_subdev_video_ops tegra_csi_video_ops = { 389 .s_stream = tegra_csi_s_stream, 390 .g_frame_interval = tegra_csi_g_frame_interval, 391 .s_frame_interval = tegra_csi_g_frame_interval, 392 }; 393 394 static const struct v4l2_subdev_pad_ops tegra_csi_pad_ops = { 395 .enum_mbus_code = csi_enum_bus_code, 396 .enum_frame_size = csi_enum_framesizes, 397 .enum_frame_interval = csi_enum_frameintervals, 398 .get_fmt = csi_get_format, 399 .set_fmt = csi_set_format, 400 }; 401 402 static const struct v4l2_subdev_ops tegra_csi_ops = { 403 .video = &tegra_csi_video_ops, 404 .pad = &tegra_csi_pad_ops, 405 }; 406 407 static int tegra_csi_channel_alloc(struct tegra_csi *csi, 408 struct device_node *node, 409 unsigned int port_num, unsigned int lanes, 410 unsigned int num_pads) 411 { 412 struct tegra_csi_channel *chan; 413 int ret = 0; 414 415 chan = kzalloc(sizeof(*chan), GFP_KERNEL); 416 if (!chan) 417 return -ENOMEM; 418 419 list_add_tail(&chan->list, &csi->csi_chans); 420 chan->csi = csi; 421 chan->csi_port_num = port_num; 422 chan->numlanes = lanes; 423 chan->of_node = node; 424 chan->numpads = num_pads; 425 if (num_pads & 0x2) { 426 chan->pads[0].flags = MEDIA_PAD_FL_SINK; 427 chan->pads[1].flags = MEDIA_PAD_FL_SOURCE; 428 } else { 429 chan->pads[0].flags = MEDIA_PAD_FL_SOURCE; 430 } 431 432 if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 433 return 0; 434 435 chan->mipi = tegra_mipi_request(csi->dev, node); 436 if (IS_ERR(chan->mipi)) { 437 ret = PTR_ERR(chan->mipi); 438 dev_err(csi->dev, "failed to get mipi device: %d\n", ret); 439 } 440 441 return ret; 442 } 443 444 static int tegra_csi_tpg_channels_alloc(struct tegra_csi *csi) 445 { 446 struct device_node *node = csi->dev->of_node; 447 unsigned int port_num; 448 unsigned int tpg_channels = csi->soc->csi_max_channels; 449 int ret; 450 451 /* allocate CSI channel for each CSI x2 ports */ 452 for (port_num = 0; port_num < tpg_channels; port_num++) { 453 ret = tegra_csi_channel_alloc(csi, node, port_num, 2, 1); 454 if (ret < 0) 455 return ret; 456 } 457 458 return 0; 459 } 460 461 static int tegra_csi_channels_alloc(struct tegra_csi *csi) 462 { 463 struct device_node *node = csi->dev->of_node; 464 struct v4l2_fwnode_endpoint v4l2_ep = { 465 .bus_type = V4L2_MBUS_CSI2_DPHY 466 }; 467 struct fwnode_handle *fwh; 468 struct device_node *channel; 469 struct device_node *ep; 470 unsigned int lanes, portno, num_pads; 471 int ret; 472 473 for_each_child_of_node(node, channel) { 474 if (!of_node_name_eq(channel, "channel")) 475 continue; 476 477 ret = of_property_read_u32(channel, "reg", &portno); 478 if (ret < 0) 479 continue; 480 481 if (portno >= csi->soc->csi_max_channels) { 482 dev_err(csi->dev, "invalid port num %d for %pOF\n", 483 portno, channel); 484 ret = -EINVAL; 485 goto err_node_put; 486 } 487 488 ep = of_graph_get_endpoint_by_regs(channel, 0, 0); 489 if (!ep) 490 continue; 491 492 fwh = of_fwnode_handle(ep); 493 ret = v4l2_fwnode_endpoint_parse(fwh, &v4l2_ep); 494 of_node_put(ep); 495 if (ret) { 496 dev_err(csi->dev, 497 "failed to parse v4l2 endpoint for %pOF: %d\n", 498 channel, ret); 499 goto err_node_put; 500 } 501 502 lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes; 503 if (!lanes || ((lanes & (lanes - 1)) != 0)) { 504 dev_err(csi->dev, "invalid data-lanes %d for %pOF\n", 505 lanes, channel); 506 ret = -EINVAL; 507 goto err_node_put; 508 } 509 510 num_pads = of_graph_get_endpoint_count(channel); 511 if (num_pads == TEGRA_CSI_PADS_NUM) { 512 ret = tegra_csi_channel_alloc(csi, channel, portno, 513 lanes, num_pads); 514 if (ret < 0) 515 goto err_node_put; 516 } 517 } 518 519 return 0; 520 521 err_node_put: 522 of_node_put(channel); 523 return ret; 524 } 525 526 static int tegra_csi_channel_init(struct tegra_csi_channel *chan) 527 { 528 struct tegra_csi *csi = chan->csi; 529 struct v4l2_subdev *subdev; 530 int ret; 531 532 /* initialize the default format */ 533 chan->format.code = MEDIA_BUS_FMT_SRGGB10_1X10; 534 chan->format.field = V4L2_FIELD_NONE; 535 chan->format.colorspace = V4L2_COLORSPACE_SRGB; 536 chan->format.width = TEGRA_DEF_WIDTH; 537 chan->format.height = TEGRA_DEF_HEIGHT; 538 csi_chan_update_blank_intervals(chan, chan->format.code, 539 chan->format.width, 540 chan->format.height); 541 /* initialize V4L2 subdevice and media entity */ 542 subdev = &chan->subdev; 543 v4l2_subdev_init(subdev, &tegra_csi_ops); 544 subdev->dev = csi->dev; 545 if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 546 snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "%s-%d", "tpg", 547 chan->csi_port_num); 548 else 549 snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "%s", 550 kbasename(chan->of_node->full_name)); 551 552 v4l2_set_subdevdata(subdev, chan); 553 subdev->fwnode = of_fwnode_handle(chan->of_node); 554 subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; 555 556 /* initialize media entity pads */ 557 ret = media_entity_pads_init(&subdev->entity, chan->numpads, 558 chan->pads); 559 if (ret < 0) { 560 dev_err(csi->dev, 561 "failed to initialize media entity: %d\n", ret); 562 subdev->dev = NULL; 563 return ret; 564 } 565 566 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) { 567 ret = v4l2_async_register_subdev(subdev); 568 if (ret < 0) { 569 dev_err(csi->dev, 570 "failed to register subdev: %d\n", ret); 571 return ret; 572 } 573 } 574 575 return 0; 576 } 577 578 void tegra_csi_error_recover(struct v4l2_subdev *sd) 579 { 580 struct tegra_csi_channel *csi_chan = to_csi_chan(sd); 581 struct tegra_csi *csi = csi_chan->csi; 582 583 /* stop streaming during error recovery */ 584 csi->ops->csi_stop_streaming(csi_chan); 585 csi->ops->csi_err_recover(csi_chan); 586 csi->ops->csi_start_streaming(csi_chan); 587 } 588 589 static int tegra_csi_channels_init(struct tegra_csi *csi) 590 { 591 struct tegra_csi_channel *chan; 592 int ret; 593 594 list_for_each_entry(chan, &csi->csi_chans, list) { 595 ret = tegra_csi_channel_init(chan); 596 if (ret) { 597 dev_err(csi->dev, 598 "failed to initialize channel-%d: %d\n", 599 chan->csi_port_num, ret); 600 return ret; 601 } 602 } 603 604 return 0; 605 } 606 607 static void tegra_csi_channels_cleanup(struct tegra_csi *csi) 608 { 609 struct v4l2_subdev *subdev; 610 struct tegra_csi_channel *chan, *tmp; 611 612 list_for_each_entry_safe(chan, tmp, &csi->csi_chans, list) { 613 if (chan->mipi) 614 tegra_mipi_free(chan->mipi); 615 616 subdev = &chan->subdev; 617 if (subdev->dev) { 618 if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 619 v4l2_async_unregister_subdev(subdev); 620 media_entity_cleanup(&subdev->entity); 621 } 622 623 list_del(&chan->list); 624 kfree(chan); 625 } 626 } 627 628 static int __maybe_unused csi_runtime_suspend(struct device *dev) 629 { 630 struct tegra_csi *csi = dev_get_drvdata(dev); 631 632 clk_bulk_disable_unprepare(csi->soc->num_clks, csi->clks); 633 634 return 0; 635 } 636 637 static int __maybe_unused csi_runtime_resume(struct device *dev) 638 { 639 struct tegra_csi *csi = dev_get_drvdata(dev); 640 int ret; 641 642 ret = clk_bulk_prepare_enable(csi->soc->num_clks, csi->clks); 643 if (ret < 0) { 644 dev_err(csi->dev, "failed to enable clocks: %d\n", ret); 645 return ret; 646 } 647 648 return 0; 649 } 650 651 static int tegra_csi_init(struct host1x_client *client) 652 { 653 struct tegra_csi *csi = host1x_client_to_csi(client); 654 struct tegra_video_device *vid = dev_get_drvdata(client->host); 655 int ret; 656 657 INIT_LIST_HEAD(&csi->csi_chans); 658 659 if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) 660 ret = tegra_csi_tpg_channels_alloc(csi); 661 else 662 ret = tegra_csi_channels_alloc(csi); 663 if (ret < 0) { 664 dev_err(csi->dev, 665 "failed to allocate channels: %d\n", ret); 666 goto cleanup; 667 } 668 669 ret = tegra_csi_channels_init(csi); 670 if (ret < 0) 671 goto cleanup; 672 673 vid->csi = csi; 674 675 return 0; 676 677 cleanup: 678 tegra_csi_channels_cleanup(csi); 679 return ret; 680 } 681 682 static int tegra_csi_exit(struct host1x_client *client) 683 { 684 struct tegra_csi *csi = host1x_client_to_csi(client); 685 686 tegra_csi_channels_cleanup(csi); 687 688 return 0; 689 } 690 691 static const struct host1x_client_ops csi_client_ops = { 692 .init = tegra_csi_init, 693 .exit = tegra_csi_exit, 694 }; 695 696 static int tegra_csi_probe(struct platform_device *pdev) 697 { 698 struct tegra_csi *csi; 699 unsigned int i; 700 int ret; 701 702 csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL); 703 if (!csi) 704 return -ENOMEM; 705 706 csi->iomem = devm_platform_ioremap_resource(pdev, 0); 707 if (IS_ERR(csi->iomem)) 708 return PTR_ERR(csi->iomem); 709 710 csi->soc = of_device_get_match_data(&pdev->dev); 711 712 csi->clks = devm_kcalloc(&pdev->dev, csi->soc->num_clks, 713 sizeof(*csi->clks), GFP_KERNEL); 714 if (!csi->clks) 715 return -ENOMEM; 716 717 for (i = 0; i < csi->soc->num_clks; i++) 718 csi->clks[i].id = csi->soc->clk_names[i]; 719 720 ret = devm_clk_bulk_get(&pdev->dev, csi->soc->num_clks, csi->clks); 721 if (ret) { 722 dev_err(&pdev->dev, "failed to get the clocks: %d\n", ret); 723 return ret; 724 } 725 726 if (!pdev->dev.pm_domain) { 727 ret = -ENOENT; 728 dev_warn(&pdev->dev, "PM domain is not attached: %d\n", ret); 729 return ret; 730 } 731 732 csi->dev = &pdev->dev; 733 csi->ops = csi->soc->ops; 734 platform_set_drvdata(pdev, csi); 735 pm_runtime_enable(&pdev->dev); 736 737 /* initialize host1x interface */ 738 INIT_LIST_HEAD(&csi->client.list); 739 csi->client.ops = &csi_client_ops; 740 csi->client.dev = &pdev->dev; 741 742 ret = host1x_client_register(&csi->client); 743 if (ret < 0) { 744 dev_err(&pdev->dev, 745 "failed to register host1x client: %d\n", ret); 746 goto rpm_disable; 747 } 748 749 return 0; 750 751 rpm_disable: 752 pm_runtime_disable(&pdev->dev); 753 return ret; 754 } 755 756 static int tegra_csi_remove(struct platform_device *pdev) 757 { 758 struct tegra_csi *csi = platform_get_drvdata(pdev); 759 int err; 760 761 err = host1x_client_unregister(&csi->client); 762 if (err < 0) { 763 dev_err(&pdev->dev, 764 "failed to unregister host1x client: %d\n", err); 765 return err; 766 } 767 768 pm_runtime_disable(&pdev->dev); 769 770 return 0; 771 } 772 773 static const struct of_device_id tegra_csi_of_id_table[] = { 774 #if defined(CONFIG_ARCH_TEGRA_210_SOC) 775 { .compatible = "nvidia,tegra210-csi", .data = &tegra210_csi_soc }, 776 #endif 777 { } 778 }; 779 MODULE_DEVICE_TABLE(of, tegra_csi_of_id_table); 780 781 static const struct dev_pm_ops tegra_csi_pm_ops = { 782 SET_RUNTIME_PM_OPS(csi_runtime_suspend, csi_runtime_resume, NULL) 783 }; 784 785 struct platform_driver tegra_csi_driver = { 786 .driver = { 787 .name = "tegra-csi", 788 .of_match_table = tegra_csi_of_id_table, 789 .pm = &tegra_csi_pm_ops, 790 }, 791 .probe = tegra_csi_probe, 792 .remove = tegra_csi_remove, 793 }; 794