drivers/staging/media/omap4iss/iss.c

   1 /*
   2  * TI OMAP4 ISS V4L2 Driver
   3  *
   4  * Copyright (C) 2012, Texas Instruments
   5  *
   6  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/i2c.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/mfd/syscon.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/slab.h>
  24 #include <linux/sched.h>
  25 #include <linux/vmalloc.h>
  26
  27 #include <media/v4l2-common.h>
  28 #include <media/v4l2-device.h>
  29 #include <media/v4l2-ctrls.h>
  30
  31 #include "iss.h"
  32 #include "iss_regs.h"
  33
  34 #define ISS_PRINT_REGISTER(iss, name)\
  35         dev_dbg(iss->dev, "###ISS " #name "=0x%08x\n", \
  36                 iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_##name))
  37
  38 static void iss_print_status(struct iss_device *iss)
  39 {
  40         dev_dbg(iss->dev, "-------------ISS HL Register dump-------------\n");
  41
  42         ISS_PRINT_REGISTER(iss, HL_REVISION);
  43         ISS_PRINT_REGISTER(iss, HL_SYSCONFIG);
  44         ISS_PRINT_REGISTER(iss, HL_IRQSTATUS(5));
  45         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_SET(5));
  46         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_CLR(5));
  47         ISS_PRINT_REGISTER(iss, CTRL);
  48         ISS_PRINT_REGISTER(iss, CLKCTRL);
  49         ISS_PRINT_REGISTER(iss, CLKSTAT);
  50
  51         dev_dbg(iss->dev, "-----------------------------------------------\n");
  52 }
  53
  54 /*
  55  * omap4iss_flush - Post pending L3 bus writes by doing a register readback
  56  * @iss: OMAP4 ISS device
  57  *
  58  * In order to force posting of pending writes, we need to write and
  59  * readback the same register, in this case the revision register.
  60  *
  61  * See this link for reference:
  62  *   http://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
  63  */
  64 void omap4iss_flush(struct iss_device *iss)
  65 {
  66         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION, 0);
  67         iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
  68 }
  69
  70 /*
  71  * iss_isp_enable_interrupts - Enable ISS ISP interrupts.
  72  * @iss: OMAP4 ISS device
  73  */
  74 static void omap4iss_isp_enable_interrupts(struct iss_device *iss)
  75 {
  76         static const u32 isp_irq = ISP5_IRQ_OCP_ERR |
  77                                    ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
  78                                    ISP5_IRQ_RSZ_FIFO_OVF |
  79                                    ISP5_IRQ_RSZ_INT_DMA |
  80                                    ISP5_IRQ_ISIF_INT(0);
  81
  82         /* Enable ISP interrupts */
  83         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0), isp_irq);
  84         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_SET(0),
  85                       isp_irq);
  86 }
  87
  88 /*
  89  * iss_isp_disable_interrupts - Disable ISS interrupts.
  90  * @iss: OMAP4 ISS device
  91  */
  92 static void omap4iss_isp_disable_interrupts(struct iss_device *iss)
  93 {
  94         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_CLR(0), ~0);
  95 }
  96
  97 /*
  98  * iss_enable_interrupts - Enable ISS interrupts.
  99  * @iss: OMAP4 ISS device
 100  */
 101 static void iss_enable_interrupts(struct iss_device *iss)
 102 {
 103         static const u32 hl_irq = ISS_HL_IRQ_CSIA | ISS_HL_IRQ_CSIB
 104                                 | ISS_HL_IRQ_ISP(0);
 105
 106         /* Enable HL interrupts */
 107         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), hl_irq);
 108         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_SET(5), hl_irq);
 109
 110         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
 111                 omap4iss_isp_enable_interrupts(iss);
 112 }
 113
 114 /*
 115  * iss_disable_interrupts - Disable ISS interrupts.
 116  * @iss: OMAP4 ISS device
 117  */
 118 static void iss_disable_interrupts(struct iss_device *iss)
 119 {
 120         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
 121                 omap4iss_isp_disable_interrupts(iss);
 122
 123         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_CLR(5), ~0);
 124 }
 125
 126 int omap4iss_get_external_info(struct iss_pipeline *pipe,
 127                                struct media_link *link)
 128 {
 129         struct iss_device *iss =
 130                 container_of(pipe, struct iss_video, pipe)->iss;
 131         struct v4l2_subdev_format fmt;
 132         struct v4l2_ctrl *ctrl;
 133         int ret;
 134
 135         if (!pipe->external)
 136                 return 0;
 137
 138         if (pipe->external_rate)
 139                 return 0;
 140
 141         memset(&fmt, 0, sizeof(fmt));
 142
 143         fmt.pad = link->source->index;
 144         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 145         ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(link->sink->entity),
 146                                pad, get_fmt, NULL, &fmt);
 147         if (ret < 0)
 148                 return -EPIPE;
 149
 150         pipe->external_bpp = omap4iss_video_format_info(fmt.format.code)->bpp;
 151
 152         ctrl = v4l2_ctrl_find(pipe->external->ctrl_handler,
 153                               V4L2_CID_PIXEL_RATE);
 154         if (!ctrl) {
 155                 dev_warn(iss->dev, "no pixel rate control in subdev %s\n",
 156                          pipe->external->name);
 157                 return -EPIPE;
 158         }
 159
 160         pipe->external_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
 161
 162         return 0;
 163 }
 164
 165 /*
 166  * Configure the bridge. Valid inputs are
 167  *
 168  * IPIPEIF_INPUT_CSI2A: CSI2a receiver
 169  * IPIPEIF_INPUT_CSI2B: CSI2b receiver
 170  *
 171  * The bridge and lane shifter are configured according to the selected input
 172  * and the ISP platform data.
 173  */
 174 void omap4iss_configure_bridge(struct iss_device *iss,
 175                                enum ipipeif_input_entity input)
 176 {
 177         u32 issctrl_val;
 178         u32 isp5ctrl_val;
 179
 180         issctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL);
 181         issctrl_val &= ~ISS_CTRL_INPUT_SEL_MASK;
 182         issctrl_val &= ~ISS_CTRL_CLK_DIV_MASK;
 183
 184         isp5ctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL);
 185
 186         switch (input) {
 187         case IPIPEIF_INPUT_CSI2A:
 188                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2A;
 189                 break;
 190
 191         case IPIPEIF_INPUT_CSI2B:
 192                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2B;
 193                 break;
 194
 195         default:
 196                 return;
 197         }
 198
 199         issctrl_val |= ISS_CTRL_SYNC_DETECT_VS_RAISING;
 200
 201         isp5ctrl_val |= ISP5_CTRL_VD_PULSE_EXT | ISP5_CTRL_PSYNC_CLK_SEL |
 202                         ISP5_CTRL_SYNC_ENABLE;
 203
 204         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL, issctrl_val);
 205         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, isp5ctrl_val);
 206 }
 207
 208 #ifdef ISS_ISR_DEBUG
 209 static void iss_isr_dbg(struct iss_device *iss, u32 irqstatus)
 210 {
 211         static const char * const name[] = {
 212                 "ISP_0",
 213                 "ISP_1",
 214                 "ISP_2",
 215                 "ISP_3",
 216                 "CSIA",
 217                 "CSIB",
 218                 "CCP2_0",
 219                 "CCP2_1",
 220                 "CCP2_2",
 221                 "CCP2_3",
 222                 "CBUFF",
 223                 "BTE",
 224                 "SIMCOP_0",
 225                 "SIMCOP_1",
 226                 "SIMCOP_2",
 227                 "SIMCOP_3",
 228                 "CCP2_8",
 229                 "HS_VS",
 230                 "18",
 231                 "19",
 232                 "20",
 233                 "21",
 234                 "22",
 235                 "23",
 236                 "24",
 237                 "25",
 238                 "26",
 239                 "27",
 240                 "28",
 241                 "29",
 242                 "30",
 243                 "31",
 244         };
 245         unsigned int i;
 246
 247         dev_dbg(iss->dev, "ISS IRQ: ");
 248
 249         for (i = 0; i < ARRAY_SIZE(name); i++) {
 250                 if ((1 << i) & irqstatus)
 251                         pr_cont("%s ", name[i]);
 252         }
 253         pr_cont("\n");
 254 }
 255
 256 static void iss_isp_isr_dbg(struct iss_device *iss, u32 irqstatus)
 257 {
 258         static const char * const name[] = {
 259                 "ISIF_0",
 260                 "ISIF_1",
 261                 "ISIF_2",
 262                 "ISIF_3",
 263                 "IPIPEREQ",
 264                 "IPIPELAST_PIX",
 265                 "IPIPEDMA",
 266                 "IPIPEBSC",
 267                 "IPIPEHST",
 268                 "IPIPEIF",
 269                 "AEW",
 270                 "AF",
 271                 "H3A",
 272                 "RSZ_REG",
 273                 "RSZ_LAST_PIX",
 274                 "RSZ_DMA",
 275                 "RSZ_CYC_RZA",
 276                 "RSZ_CYC_RZB",
 277                 "RSZ_FIFO_OVF",
 278                 "RSZ_FIFO_IN_BLK_ERR",
 279                 "20",
 280                 "21",
 281                 "RSZ_EOF0",
 282                 "RSZ_EOF1",
 283                 "H3A_EOF",
 284                 "IPIPE_EOF",
 285                 "26",
 286                 "IPIPE_DPC_INI",
 287                 "IPIPE_DPC_RNEW0",
 288                 "IPIPE_DPC_RNEW1",
 289                 "30",
 290                 "OCP_ERR",
 291         };
 292         unsigned int i;
 293
 294         dev_dbg(iss->dev, "ISP IRQ: ");
 295
 296         for (i = 0; i < ARRAY_SIZE(name); i++) {
 297                 if ((1 << i) & irqstatus)
 298                         pr_cont("%s ", name[i]);
 299         }
 300         pr_cont("\n");
 301 }
 302 #endif
 303
 304 /*
 305  * iss_isr - Interrupt Service Routine for ISS module.
 306  * @irq: Not used currently.
 307  * @_iss: Pointer to the OMAP4 ISS device
 308  *
 309  * Handles the corresponding callback if plugged in.
 310  *
 311  * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
 312  * IRQ wasn't handled.
 313  */
 314 static irqreturn_t iss_isr(int irq, void *_iss)
 315 {
 316         static const u32 ipipeif_events = ISP5_IRQ_IPIPEIF_IRQ |
 317                                           ISP5_IRQ_ISIF_INT(0);
 318         static const u32 resizer_events = ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
 319                                           ISP5_IRQ_RSZ_FIFO_OVF |
 320                                           ISP5_IRQ_RSZ_INT_DMA;
 321         struct iss_device *iss = _iss;
 322         u32 irqstatus;
 323
 324         irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5));
 325         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), irqstatus);
 326
 327         if (irqstatus & ISS_HL_IRQ_CSIA)
 328                 omap4iss_csi2_isr(&iss->csi2a);
 329
 330         if (irqstatus & ISS_HL_IRQ_CSIB)
 331                 omap4iss_csi2_isr(&iss->csi2b);
 332
 333         if (irqstatus & ISS_HL_IRQ_ISP(0)) {
 334                 u32 isp_irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1,
 335                                                  ISP5_IRQSTATUS(0));
 336                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0),
 337                               isp_irqstatus);
 338
 339                 if (isp_irqstatus & ISP5_IRQ_OCP_ERR)
 340                         dev_dbg(iss->dev, "ISP5 OCP Error!\n");
 341
 342                 if (isp_irqstatus & ipipeif_events) {
 343                         omap4iss_ipipeif_isr(&iss->ipipeif,
 344                                              isp_irqstatus & ipipeif_events);
 345                 }
 346
 347                 if (isp_irqstatus & resizer_events)
 348                         omap4iss_resizer_isr(&iss->resizer,
 349                                              isp_irqstatus & resizer_events);
 350
 351 #ifdef ISS_ISR_DEBUG
 352                 iss_isp_isr_dbg(iss, isp_irqstatus);
 353 #endif
 354         }
 355
 356         omap4iss_flush(iss);
 357
 358 #ifdef ISS_ISR_DEBUG
 359         iss_isr_dbg(iss, irqstatus);
 360 #endif
 361
 362         return IRQ_HANDLED;
 363 }
 364
 365 /* -----------------------------------------------------------------------------
 366  * Pipeline power management
 367  *
 368  * Entities must be powered up when part of a pipeline that contains at least
 369  * one open video device node.
 370  *
 371  * To achieve this use the entity use_count field to track the number of users.
 372  * For entities corresponding to video device nodes the use_count field stores
 373  * the users count of the node. For entities corresponding to subdevs the
 374  * use_count field stores the total number of users of all video device nodes
 375  * in the pipeline.
 376  *
 377  * The omap4iss_pipeline_pm_use() function must be called in the open() and
 378  * close() handlers of video device nodes. It increments or decrements the use
 379  * count of all subdev entities in the pipeline.
 380  *
 381  * To react to link management on powered pipelines, the link setup notification
 382  * callback updates the use count of all entities in the source and sink sides
 383  * of the link.
 384  */
 385
 386 /*
 387  * iss_pipeline_pm_use_count - Count the number of users of a pipeline
 388  * @entity: The entity
 389  *
 390  * Return the total number of users of all video device nodes in the pipeline.
 391  */
 392 static int iss_pipeline_pm_use_count(struct media_entity *entity)
 393 {
 394         struct media_entity_graph graph;
 395         int use = 0;
 396
 397         media_entity_graph_walk_start(&graph, entity);
 398
 399         while ((entity = media_entity_graph_walk_next(&graph))) {
 400                 if (media_entity_type(entity) == MEDIA_ENT_T_DEVNODE)
 401                         use += entity->use_count;
 402         }
 403
 404         return use;
 405 }
 406
 407 /*
 408  * iss_pipeline_pm_power_one - Apply power change to an entity
 409  * @entity: The entity
 410  * @change: Use count change
 411  *
 412  * Change the entity use count by @change. If the entity is a subdev update its
 413  * power state by calling the core::s_power operation when the use count goes
 414  * from 0 to != 0 or from != 0 to 0.
 415  *
 416  * Return 0 on success or a negative error code on failure.
 417  */
 418 static int iss_pipeline_pm_power_one(struct media_entity *entity, int change)
 419 {
 420         struct v4l2_subdev *subdev;
 421
 422         subdev = media_entity_type(entity) == MEDIA_ENT_T_V4L2_SUBDEV
 423                ? media_entity_to_v4l2_subdev(entity) : NULL;
 424
 425         if (entity->use_count == 0 && change > 0 && subdev) {
 426                 int ret;
 427
 428                 ret = v4l2_subdev_call(subdev, core, s_power, 1);
 429                 if (ret < 0 && ret != -ENOIOCTLCMD)
 430                         return ret;
 431         }
 432
 433         entity->use_count += change;
 434         WARN_ON(entity->use_count < 0);
 435
 436         if (entity->use_count == 0 && change < 0 && subdev)
 437                 v4l2_subdev_call(subdev, core, s_power, 0);
 438
 439         return 0;
 440 }
 441
 442 /*
 443  * iss_pipeline_pm_power - Apply power change to all entities in a pipeline
 444  * @entity: The entity
 445  * @change: Use count change
 446  *
 447  * Walk the pipeline to update the use count and the power state of all non-node
 448  * entities.
 449  *
 450  * Return 0 on success or a negative error code on failure.
 451  */
 452 static int iss_pipeline_pm_power(struct media_entity *entity, int change)
 453 {
 454         struct media_entity_graph graph;
 455         struct media_entity *first = entity;
 456         int ret = 0;
 457
 458         if (!change)
 459                 return 0;
 460
 461         media_entity_graph_walk_start(&graph, entity);
 462
 463         while (!ret && (entity = media_entity_graph_walk_next(&graph)))
 464                 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
 465                         ret = iss_pipeline_pm_power_one(entity, change);
 466
 467         if (!ret)
 468                 return 0;
 469
 470         media_entity_graph_walk_start(&graph, first);
 471
 472         while ((first = media_entity_graph_walk_next(&graph)) &&
 473                first != entity)
 474                 if (media_entity_type(first) != MEDIA_ENT_T_DEVNODE)
 475                         iss_pipeline_pm_power_one(first, -change);
 476
 477         return ret;
 478 }
 479
 480 /*
 481  * omap4iss_pipeline_pm_use - Update the use count of an entity
 482  * @entity: The entity
 483  * @use: Use (1) or stop using (0) the entity
 484  *
 485  * Update the use count of all entities in the pipeline and power entities on or
 486  * off accordingly.
 487  *
 488  * Return 0 on success or a negative error code on failure. Powering entities
 489  * off is assumed to never fail. No failure can occur when the use parameter is
 490  * set to 0.
 491  */
 492 int omap4iss_pipeline_pm_use(struct media_entity *entity, int use)
 493 {
 494         int change = use ? 1 : -1;
 495         int ret;
 496
 497         mutex_lock(&entity->parent->graph_mutex);
 498
 499         /* Apply use count to node. */
 500         entity->use_count += change;
 501         WARN_ON(entity->use_count < 0);
 502
 503         /* Apply power change to connected non-nodes. */
 504         ret = iss_pipeline_pm_power(entity, change);
 505         if (ret < 0)
 506                 entity->use_count -= change;
 507
 508         mutex_unlock(&entity->parent->graph_mutex);
 509
 510         return ret;
 511 }
 512
 513 /*
 514  * iss_pipeline_link_notify - Link management notification callback
 515  * @link: The link
 516  * @flags: New link flags that will be applied
 517  *
 518  * React to link management on powered pipelines by updating the use count of
 519  * all entities in the source and sink sides of the link. Entities are powered
 520  * on or off accordingly.
 521  *
 522  * Return 0 on success or a negative error code on failure. Powering entities
 523  * off is assumed to never fail. This function will not fail for disconnection
 524  * events.
 525  */
 526 static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
 527                                     unsigned int notification)
 528 {
 529         struct media_entity *source = link->source->entity;
 530         struct media_entity *sink = link->sink->entity;
 531         int source_use = iss_pipeline_pm_use_count(source);
 532         int sink_use = iss_pipeline_pm_use_count(sink);
 533         int ret;
 534
 535         if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
 536             !(link->flags & MEDIA_LNK_FL_ENABLED)) {
 537                 /* Powering off entities is assumed to never fail. */
 538                 iss_pipeline_pm_power(source, -sink_use);
 539                 iss_pipeline_pm_power(sink, -source_use);
 540                 return 0;
 541         }
 542
 543         if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
 544             (flags & MEDIA_LNK_FL_ENABLED)) {
 545                 ret = iss_pipeline_pm_power(source, sink_use);
 546                 if (ret < 0)
 547                         return ret;
 548
 549                 ret = iss_pipeline_pm_power(sink, source_use);
 550                 if (ret < 0)
 551                         iss_pipeline_pm_power(source, -sink_use);
 552
 553                 return ret;
 554         }
 555
 556         return 0;
 557 }
 558
 559 /* -----------------------------------------------------------------------------
 560  * Pipeline stream management
 561  */
 562
 563 /*
 564  * iss_pipeline_disable - Disable streaming on a pipeline
 565  * @pipe: ISS pipeline
 566  * @until: entity at which to stop pipeline walk
 567  *
 568  * Walk the entities chain starting at the pipeline output video node and stop
 569  * all modules in the chain. Wait synchronously for the modules to be stopped if
 570  * necessary.
 571  *
 572  * If the until argument isn't NULL, stop the pipeline walk when reaching the
 573  * until entity. This is used to disable a partially started pipeline due to a
 574  * subdev start error.
 575  */
 576 static int iss_pipeline_disable(struct iss_pipeline *pipe,
 577                                 struct media_entity *until)
 578 {
 579         struct iss_device *iss = pipe->output->iss;
 580         struct media_entity *entity;
 581         struct media_pad *pad;
 582         struct v4l2_subdev *subdev;
 583         int failure = 0;
 584         int ret;
 585
 586         entity = &pipe->output->video.entity;
 587         while (1) {
 588                 pad = &entity->pads[0];
 589                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 590                         break;
 591
 592                 pad = media_entity_remote_pad(pad);
 593                 if (!pad ||
 594                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
 595                         break;
 596
 597                 entity = pad->entity;
 598                 if (entity == until)
 599                         break;
 600
 601                 subdev = media_entity_to_v4l2_subdev(entity);
 602                 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
 603                 if (ret < 0) {
 604                         dev_dbg(iss->dev, "%s: module stop timeout.\n",
 605                                 subdev->name);
 606                         /* If the entity failed to stopped, assume it has
 607                          * crashed. Mark it as such, the ISS will be reset when
 608                          * applications will release it.
 609                          */
 610                         iss->crashed |= 1U << subdev->entity.id;
 611                         failure = -ETIMEDOUT;
 612                 }
 613         }
 614
 615         return failure;
 616 }
 617
 618 /*
 619  * iss_pipeline_enable - Enable streaming on a pipeline
 620  * @pipe: ISS pipeline
 621  * @mode: Stream mode (single shot or continuous)
 622  *
 623  * Walk the entities chain starting at the pipeline output video node and start
 624  * all modules in the chain in the given mode.
 625  *
 626  * Return 0 if successful, or the return value of the failed video::s_stream
 627  * operation otherwise.
 628  */
 629 static int iss_pipeline_enable(struct iss_pipeline *pipe,
 630                                enum iss_pipeline_stream_state mode)
 631 {
 632         struct iss_device *iss = pipe->output->iss;
 633         struct media_entity *entity;
 634         struct media_pad *pad;
 635         struct v4l2_subdev *subdev;
 636         unsigned long flags;
 637         int ret;
 638
 639         /* If one of the entities in the pipeline has crashed it will not work
 640          * properly. Refuse to start streaming in that case. This check must be
 641          * performed before the loop below to avoid starting entities if the
 642          * pipeline won't start anyway (those entities would then likely fail to
 643          * stop, making the problem worse).
 644          */
 645         if (pipe->entities & iss->crashed)
 646                 return -EIO;
 647
 648         spin_lock_irqsave(&pipe->lock, flags);
 649         pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
 650         spin_unlock_irqrestore(&pipe->lock, flags);
 651
 652         pipe->do_propagation = false;
 653
 654         entity = &pipe->output->video.entity;
 655         while (1) {
 656                 pad = &entity->pads[0];
 657                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 658                         break;
 659
 660                 pad = media_entity_remote_pad(pad);
 661                 if (!pad ||
 662                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
 663                         break;
 664
 665                 entity = pad->entity;
 666                 subdev = media_entity_to_v4l2_subdev(entity);
 667
 668                 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
 669                 if (ret < 0 && ret != -ENOIOCTLCMD) {
 670                         iss_pipeline_disable(pipe, entity);
 671                         return ret;
 672                 }
 673
 674                 if (subdev == &iss->csi2a.subdev ||
 675                     subdev == &iss->csi2b.subdev)
 676                         pipe->do_propagation = true;
 677         }
 678
 679         iss_print_status(pipe->output->iss);
 680         return 0;
 681 }
 682
 683 /*
 684  * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
 685  * @pipe: ISS pipeline
 686  * @state: Stream state (stopped, single shot or continuous)
 687  *
 688  * Set the pipeline to the given stream state. Pipelines can be started in
 689  * single-shot or continuous mode.
 690  *
 691  * Return 0 if successful, or the return value of the failed video::s_stream
 692  * operation otherwise. The pipeline state is not updated when the operation
 693  * fails, except when stopping the pipeline.
 694  */
 695 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
 696                                  enum iss_pipeline_stream_state state)
 697 {
 698         int ret;
 699
 700         if (state == ISS_PIPELINE_STREAM_STOPPED)
 701                 ret = iss_pipeline_disable(pipe, NULL);
 702         else
 703                 ret = iss_pipeline_enable(pipe, state);
 704
 705         if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
 706                 pipe->stream_state = state;
 707
 708         return ret;
 709 }
 710
 711 /*
 712  * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
 713  * @pipe: ISS pipeline
 714  *
 715  * Cancelling a stream mark all buffers on all video nodes in the pipeline as
 716  * erroneous and makes sure no new buffer can be queued. This function is called
 717  * when a fatal error that prevents any further operation on the pipeline
 718  * occurs.
 719  */
 720 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
 721 {
 722         if (pipe->input)
 723                 omap4iss_video_cancel_stream(pipe->input);
 724         if (pipe->output)
 725                 omap4iss_video_cancel_stream(pipe->output);
 726 }
 727
 728 /*
 729  * iss_pipeline_is_last - Verify if entity has an enabled link to the output
 730  *                        video node
 731  * @me: ISS module's media entity
 732  *
 733  * Returns 1 if the entity has an enabled link to the output video node or 0
 734  * otherwise. It's true only while pipeline can have no more than one output
 735  * node.
 736  */
 737 static int iss_pipeline_is_last(struct media_entity *me)
 738 {
 739         struct iss_pipeline *pipe;
 740         struct media_pad *pad;
 741
 742         if (!me->pipe)
 743                 return 0;
 744         pipe = to_iss_pipeline(me);
 745         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
 746                 return 0;
 747         pad = media_entity_remote_pad(&pipe->output->pad);
 748         return pad->entity == me;
 749 }
 750
 751 static int iss_reset(struct iss_device *iss)
 752 {
 753         unsigned int timeout;
 754
 755         iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
 756                     ISS_HL_SYSCONFIG_SOFTRESET);
 757
 758         timeout = iss_poll_condition_timeout(
 759                 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
 760                 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
 761         if (timeout) {
 762                 dev_err(iss->dev, "ISS reset timeout\n");
 763                 return -ETIMEDOUT;
 764         }
 765
 766         iss->crashed = 0;
 767         return 0;
 768 }
 769
 770 static int iss_isp_reset(struct iss_device *iss)
 771 {
 772         unsigned int timeout;
 773
 774         /* Fist, ensure that the ISP is IDLE (no transactions happening) */
 775         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
 776                        ISP5_SYSCONFIG_STANDBYMODE_MASK,
 777                        ISP5_SYSCONFIG_STANDBYMODE_SMART);
 778
 779         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
 780
 781         timeout = iss_poll_condition_timeout(
 782                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
 783                 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
 784         if (timeout) {
 785                 dev_err(iss->dev, "ISP5 standby timeout\n");
 786                 return -ETIMEDOUT;
 787         }
 788
 789         /* Now finally, do the reset */
 790         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
 791                     ISP5_SYSCONFIG_SOFTRESET);
 792
 793         timeout = iss_poll_condition_timeout(
 794                 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
 795                 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
 796         if (timeout) {
 797                 dev_err(iss->dev, "ISP5 reset timeout\n");
 798                 return -ETIMEDOUT;
 799         }
 800
 801         return 0;
 802 }
 803
 804 /*
 805  * iss_module_sync_idle - Helper to sync module with its idle state
 806  * @me: ISS submodule's media entity
 807  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
 808  * @stopping: flag which tells module wants to stop
 809  *
 810  * This function checks if ISS submodule needs to wait for next interrupt. If
 811  * yes, makes the caller to sleep while waiting for such event.
 812  */
 813 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
 814                               atomic_t *stopping)
 815 {
 816         struct iss_pipeline *pipe = to_iss_pipeline(me);
 817         struct iss_video *video = pipe->output;
 818         unsigned long flags;
 819
 820         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
 821             (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
 822              !iss_pipeline_ready(pipe)))
 823                 return 0;
 824
 825         /*
 826          * atomic_set() doesn't include memory barrier on ARM platform for SMP
 827          * scenario. We'll call it here to avoid race conditions.
 828          */
 829         atomic_set(stopping, 1);
 830         smp_wmb();
 831
 832         /*
 833          * If module is the last one, it's writing to memory. In this case,
 834          * it's necessary to check if the module is already paused due to
 835          * DMA queue underrun or if it has to wait for next interrupt to be
 836          * idle.
 837          * If it isn't the last one, the function won't sleep but *stopping
 838          * will still be set to warn next submodule caller's interrupt the
 839          * module wants to be idle.
 840          */
 841         if (!iss_pipeline_is_last(me))
 842                 return 0;
 843
 844         spin_lock_irqsave(&video->qlock, flags);
 845         if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
 846                 spin_unlock_irqrestore(&video->qlock, flags);
 847                 atomic_set(stopping, 0);
 848                 smp_wmb();
 849                 return 0;
 850         }
 851         spin_unlock_irqrestore(&video->qlock, flags);
 852         if (!wait_event_timeout(*wait, !atomic_read(stopping),
 853                                 msecs_to_jiffies(1000))) {
 854                 atomic_set(stopping, 0);
 855                 smp_wmb();
 856                 return -ETIMEDOUT;
 857         }
 858
 859         return 0;
 860 }
 861
 862 /*
 863  * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
 864  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
 865  * @stopping: flag which tells module wants to stop
 866  *
 867  * This function checks if ISS submodule was stopping. In case of yes, it
 868  * notices the caller by setting stopping to 0 and waking up the wait queue.
 869  * Returns 1 if it was stopping or 0 otherwise.
 870  */
 871 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
 872                                      atomic_t *stopping)
 873 {
 874         if (atomic_cmpxchg(stopping, 1, 0)) {
 875                 wake_up(wait);
 876                 return 1;
 877         }
 878
 879         return 0;
 880 }
 881
 882 /* --------------------------------------------------------------------------
 883  * Clock management
 884  */
 885
 886 #define ISS_CLKCTRL_MASK        (ISS_CLKCTRL_CSI2_A |\
 887                                  ISS_CLKCTRL_CSI2_B |\
 888                                  ISS_CLKCTRL_ISP)
 889
 890 static int __iss_subclk_update(struct iss_device *iss)
 891 {
 892         u32 clk = 0;
 893         int ret = 0, timeout = 1000;
 894
 895         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
 896                 clk |= ISS_CLKCTRL_CSI2_A;
 897
 898         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
 899                 clk |= ISS_CLKCTRL_CSI2_B;
 900
 901         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
 902                 clk |= ISS_CLKCTRL_ISP;
 903
 904         iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
 905                        ISS_CLKCTRL_MASK, clk);
 906
 907         /* Wait for HW assertion */
 908         while (--timeout > 0) {
 909                 udelay(1);
 910                 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
 911                     ISS_CLKCTRL_MASK) == clk)
 912                         break;
 913         }
 914
 915         if (!timeout)
 916                 ret = -EBUSY;
 917
 918         return ret;
 919 }
 920
 921 int omap4iss_subclk_enable(struct iss_device *iss,
 922                            enum iss_subclk_resource res)
 923 {
 924         iss->subclk_resources |= res;
 925
 926         return __iss_subclk_update(iss);
 927 }
 928
 929 int omap4iss_subclk_disable(struct iss_device *iss,
 930                             enum iss_subclk_resource res)
 931 {
 932         iss->subclk_resources &= ~res;
 933
 934         return __iss_subclk_update(iss);
 935 }
 936
 937 #define ISS_ISP5_CLKCTRL_MASK   (ISP5_CTRL_BL_CLK_ENABLE |\
 938                                  ISP5_CTRL_ISIF_CLK_ENABLE |\
 939                                  ISP5_CTRL_H3A_CLK_ENABLE |\
 940                                  ISP5_CTRL_RSZ_CLK_ENABLE |\
 941                                  ISP5_CTRL_IPIPE_CLK_ENABLE |\
 942                                  ISP5_CTRL_IPIPEIF_CLK_ENABLE)
 943
 944 static void __iss_isp_subclk_update(struct iss_device *iss)
 945 {
 946         u32 clk = 0;
 947
 948         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
 949                 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
 950
 951         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
 952                 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
 953
 954         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
 955                 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
 956
 957         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
 958                 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
 959
 960         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
 961                 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
 962
 963         if (clk)
 964                 clk |= ISP5_CTRL_BL_CLK_ENABLE;
 965
 966         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
 967                        ISS_ISP5_CLKCTRL_MASK, clk);
 968 }
 969
 970 void omap4iss_isp_subclk_enable(struct iss_device *iss,
 971                                 enum iss_isp_subclk_resource res)
 972 {
 973         iss->isp_subclk_resources |= res;
 974
 975         __iss_isp_subclk_update(iss);
 976 }
 977
 978 void omap4iss_isp_subclk_disable(struct iss_device *iss,
 979                                  enum iss_isp_subclk_resource res)
 980 {
 981         iss->isp_subclk_resources &= ~res;
 982
 983         __iss_isp_subclk_update(iss);
 984 }
 985
 986 /*
 987  * iss_enable_clocks - Enable ISS clocks
 988  * @iss: OMAP4 ISS device
 989  *
 990  * Return 0 if successful, or clk_enable return value if any of tthem fails.
 991  */
 992 static int iss_enable_clocks(struct iss_device *iss)
 993 {
 994         int ret;
 995
 996         ret = clk_enable(iss->iss_fck);
 997         if (ret) {
 998                 dev_err(iss->dev, "clk_enable iss_fck failed\n");
 999                 return ret;
1000         }
1001
1002         ret = clk_enable(iss->iss_ctrlclk);
1003         if (ret) {
1004                 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
1005                 clk_disable(iss->iss_fck);
1006                 return ret;
1007         }
1008
1009         return 0;
1010 }
1011
1012 /*
1013  * iss_disable_clocks - Disable ISS clocks
1014  * @iss: OMAP4 ISS device
1015  */
1016 static void iss_disable_clocks(struct iss_device *iss)
1017 {
1018         clk_disable(iss->iss_ctrlclk);
1019         clk_disable(iss->iss_fck);
1020 }
1021
1022 static int iss_get_clocks(struct iss_device *iss)
1023 {
1024         iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
1025         if (IS_ERR(iss->iss_fck)) {
1026                 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
1027                 return PTR_ERR(iss->iss_fck);
1028         }
1029
1030         iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
1031         if (IS_ERR(iss->iss_ctrlclk)) {
1032                 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
1033                 return PTR_ERR(iss->iss_ctrlclk);
1034         }
1035
1036         return 0;
1037 }
1038
1039 /*
1040  * omap4iss_get - Acquire the ISS resource.
1041  *
1042  * Initializes the clocks for the first acquire.
1043  *
1044  * Increment the reference count on the ISS. If the first reference is taken,
1045  * enable clocks and power-up all submodules.
1046  *
1047  * Return a pointer to the ISS device structure, or NULL if an error occurred.
1048  */
1049 struct iss_device *omap4iss_get(struct iss_device *iss)
1050 {
1051         struct iss_device *__iss = iss;
1052
1053         if (!iss)
1054                 return NULL;
1055
1056         mutex_lock(&iss->iss_mutex);
1057         if (iss->ref_count > 0)
1058                 goto out;
1059
1060         if (iss_enable_clocks(iss) < 0) {
1061                 __iss = NULL;
1062                 goto out;
1063         }
1064
1065         iss_enable_interrupts(iss);
1066
1067 out:
1068         if (__iss)
1069                 iss->ref_count++;
1070         mutex_unlock(&iss->iss_mutex);
1071
1072         return __iss;
1073 }
1074
1075 /*
1076  * omap4iss_put - Release the ISS
1077  *
1078  * Decrement the reference count on the ISS. If the last reference is released,
1079  * power-down all submodules, disable clocks and free temporary buffers.
1080  */
1081 void omap4iss_put(struct iss_device *iss)
1082 {
1083         if (!iss)
1084                 return;
1085
1086         mutex_lock(&iss->iss_mutex);
1087         BUG_ON(iss->ref_count == 0);
1088         if (--iss->ref_count == 0) {
1089                 iss_disable_interrupts(iss);
1090                 /* Reset the ISS if an entity has failed to stop. This is the
1091                  * only way to recover from such conditions, although it would
1092                  * be worth investigating whether resetting the ISP only can't
1093                  * fix the problem in some cases.
1094                  */
1095                 if (iss->crashed)
1096                         iss_reset(iss);
1097                 iss_disable_clocks(iss);
1098         }
1099         mutex_unlock(&iss->iss_mutex);
1100 }
1101
1102 static int iss_map_mem_resource(struct platform_device *pdev,
1103                                 struct iss_device *iss,
1104                                 enum iss_mem_resources res)
1105 {
1106         struct resource *mem;
1107
1108         mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
1109
1110         iss->regs[res] = devm_ioremap_resource(iss->dev, mem);
1111
1112         return PTR_ERR_OR_ZERO(iss->regs[res]);
1113 }
1114
1115 static void iss_unregister_entities(struct iss_device *iss)
1116 {
1117         omap4iss_resizer_unregister_entities(&iss->resizer);
1118         omap4iss_ipipe_unregister_entities(&iss->ipipe);
1119         omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
1120         omap4iss_csi2_unregister_entities(&iss->csi2a);
1121         omap4iss_csi2_unregister_entities(&iss->csi2b);
1122
1123         v4l2_device_unregister(&iss->v4l2_dev);
1124         media_device_unregister(&iss->media_dev);
1125 }
1126
1127 /*
1128  * iss_register_subdev_group - Register a group of subdevices
1129  * @iss: OMAP4 ISS device
1130  * @board_info: I2C subdevs board information array
1131  *
1132  * Register all I2C subdevices in the board_info array. The array must be
1133  * terminated by a NULL entry, and the first entry must be the sensor.
1134  *
1135  * Return a pointer to the sensor media entity if it has been successfully
1136  * registered, or NULL otherwise.
1137  */
1138 static struct v4l2_subdev *
1139 iss_register_subdev_group(struct iss_device *iss,
1140                           struct iss_subdev_i2c_board_info *board_info)
1141 {
1142         struct v4l2_subdev *sensor = NULL;
1143         unsigned int first;
1144
1145         if (!board_info->board_info)
1146                 return NULL;
1147
1148         for (first = 1; board_info->board_info; ++board_info, first = 0) {
1149                 struct v4l2_subdev *subdev;
1150                 struct i2c_adapter *adapter;
1151
1152                 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
1153                 if (!adapter) {
1154                         dev_err(iss->dev,
1155                                 "%s: Unable to get I2C adapter %d for device %s\n",
1156                                 __func__, board_info->i2c_adapter_id,
1157                                 board_info->board_info->type);
1158                         continue;
1159                 }
1160
1161                 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
1162                                 board_info->board_info, NULL);
1163                 if (!subdev) {
1164                         dev_err(iss->dev, "Unable to register subdev %s\n",
1165                                 board_info->board_info->type);
1166                         continue;
1167                 }
1168
1169                 if (first)
1170                         sensor = subdev;
1171         }
1172
1173         return sensor;
1174 }
1175
1176 static int iss_register_entities(struct iss_device *iss)
1177 {
1178         struct iss_platform_data *pdata = iss->pdata;
1179         struct iss_v4l2_subdevs_group *subdevs;
1180         int ret;
1181
1182         iss->media_dev.dev = iss->dev;
1183         strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
1184                 sizeof(iss->media_dev.model));
1185         iss->media_dev.hw_revision = iss->revision;
1186         iss->media_dev.link_notify = iss_pipeline_link_notify;
1187         ret = media_device_register(&iss->media_dev);
1188         if (ret < 0) {
1189                 dev_err(iss->dev, "Media device registration failed (%d)\n",
1190                         ret);
1191                 return ret;
1192         }
1193
1194         iss->v4l2_dev.mdev = &iss->media_dev;
1195         ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1196         if (ret < 0) {
1197                 dev_err(iss->dev, "V4L2 device registration failed (%d)\n",
1198                         ret);
1199                 goto done;
1200         }
1201
1202         /* Register internal entities */
1203         ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1204         if (ret < 0)
1205                 goto done;
1206
1207         ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1208         if (ret < 0)
1209                 goto done;
1210
1211         ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1212         if (ret < 0)
1213                 goto done;
1214
1215         ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1216         if (ret < 0)
1217                 goto done;
1218
1219         ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1220         if (ret < 0)
1221                 goto done;
1222
1223         /* Register external entities */
1224         for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1225                 struct v4l2_subdev *sensor;
1226                 struct media_entity *input;
1227                 unsigned int flags;
1228                 unsigned int pad;
1229
1230                 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1231                 if (!sensor)
1232                         continue;
1233
1234                 sensor->host_priv = subdevs;
1235
1236                 /* Connect the sensor to the correct interface module.
1237                  * CSI2a receiver through CSIPHY1, or
1238                  * CSI2b receiver through CSIPHY2
1239                  */
1240                 switch (subdevs->interface) {
1241                 case ISS_INTERFACE_CSI2A_PHY1:
1242                         input = &iss->csi2a.subdev.entity;
1243                         pad = CSI2_PAD_SINK;
1244                         flags = MEDIA_LNK_FL_IMMUTABLE
1245                               | MEDIA_LNK_FL_ENABLED;
1246                         break;
1247
1248                 case ISS_INTERFACE_CSI2B_PHY2:
1249                         input = &iss->csi2b.subdev.entity;
1250                         pad = CSI2_PAD_SINK;
1251                         flags = MEDIA_LNK_FL_IMMUTABLE
1252                               | MEDIA_LNK_FL_ENABLED;
1253                         break;
1254
1255                 default:
1256                         dev_err(iss->dev, "invalid interface type %u\n",
1257                                 subdevs->interface);
1258                         ret = -EINVAL;
1259                         goto done;
1260                 }
1261
1262                 ret = media_entity_create_link(&sensor->entity, 0, input, pad,
1263                                                flags);
1264                 if (ret < 0)
1265                         goto done;
1266         }
1267
1268         ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1269
1270 done:
1271         if (ret < 0)
1272                 iss_unregister_entities(iss);
1273
1274         return ret;
1275 }
1276
1277 static void iss_cleanup_modules(struct iss_device *iss)
1278 {
1279         omap4iss_csi2_cleanup(iss);
1280         omap4iss_ipipeif_cleanup(iss);
1281         omap4iss_ipipe_cleanup(iss);
1282         omap4iss_resizer_cleanup(iss);
1283 }
1284
1285 static int iss_initialize_modules(struct iss_device *iss)
1286 {
1287         int ret;
1288
1289         ret = omap4iss_csiphy_init(iss);
1290         if (ret < 0) {
1291                 dev_err(iss->dev, "CSI PHY initialization failed\n");
1292                 goto error_csiphy;
1293         }
1294
1295         ret = omap4iss_csi2_init(iss);
1296         if (ret < 0) {
1297                 dev_err(iss->dev, "CSI2 initialization failed\n");
1298                 goto error_csi2;
1299         }
1300
1301         ret = omap4iss_ipipeif_init(iss);
1302         if (ret < 0) {
1303                 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1304                 goto error_ipipeif;
1305         }
1306
1307         ret = omap4iss_ipipe_init(iss);
1308         if (ret < 0) {
1309                 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1310                 goto error_ipipe;
1311         }
1312
1313         ret = omap4iss_resizer_init(iss);
1314         if (ret < 0) {
1315                 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1316                 goto error_resizer;
1317         }
1318
1319         /* Connect the submodules. */
1320         ret = media_entity_create_link(
1321                         &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1322                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1323         if (ret < 0)
1324                 goto error_link;
1325
1326         ret = media_entity_create_link(
1327                         &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1328                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1329         if (ret < 0)
1330                 goto error_link;
1331
1332         ret = media_entity_create_link(
1333                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1334                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1335         if (ret < 0)
1336                 goto error_link;
1337
1338         ret = media_entity_create_link(
1339                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1340                         &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1341         if (ret < 0)
1342                 goto error_link;
1343
1344         ret = media_entity_create_link(
1345                         &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1346                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1347         if (ret < 0)
1348                 goto error_link;
1349
1350         return 0;
1351
1352 error_link:
1353         omap4iss_resizer_cleanup(iss);
1354 error_resizer:
1355         omap4iss_ipipe_cleanup(iss);
1356 error_ipipe:
1357         omap4iss_ipipeif_cleanup(iss);
1358 error_ipipeif:
1359         omap4iss_csi2_cleanup(iss);
1360 error_csi2:
1361 error_csiphy:
1362         return ret;
1363 }
1364
1365 static int iss_probe(struct platform_device *pdev)
1366 {
1367         struct iss_platform_data *pdata = pdev->dev.platform_data;
1368         struct iss_device *iss;
1369         unsigned int i;
1370         int ret;
1371
1372         if (!pdata)
1373                 return -EINVAL;
1374
1375         iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1376         if (!iss)
1377                 return -ENOMEM;
1378
1379         mutex_init(&iss->iss_mutex);
1380
1381         iss->dev = &pdev->dev;
1382         iss->pdata = pdata;
1383
1384         iss->raw_dmamask = DMA_BIT_MASK(32);
1385         iss->dev->dma_mask = &iss->raw_dmamask;
1386         iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1387
1388         platform_set_drvdata(pdev, iss);
1389
1390         /*
1391          * TODO: When implementing DT support switch to syscon regmap lookup by
1392          * phandle.
1393          */
1394         iss->syscon = syscon_regmap_lookup_by_compatible("syscon");
1395         if (IS_ERR(iss->syscon)) {
1396                 ret = PTR_ERR(iss->syscon);
1397                 goto error;
1398         }
1399
1400         /* Clocks */
1401         ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1402         if (ret < 0)
1403                 goto error;
1404
1405         ret = iss_get_clocks(iss);
1406         if (ret < 0)
1407                 goto error;
1408
1409         if (!omap4iss_get(iss))
1410                 goto error;
1411
1412         ret = iss_reset(iss);
1413         if (ret < 0)
1414                 goto error_iss;
1415
1416         iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1417         dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1418
1419         for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1420                 ret = iss_map_mem_resource(pdev, iss, i);
1421                 if (ret)
1422                         goto error_iss;
1423         }
1424
1425         /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1426         iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1427                        BTE_CTRL_BW_LIMITER_MASK,
1428                        18 << BTE_CTRL_BW_LIMITER_SHIFT);
1429
1430         /* Perform ISP reset */
1431         ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1432         if (ret < 0)
1433                 goto error_iss;
1434
1435         ret = iss_isp_reset(iss);
1436         if (ret < 0)
1437                 goto error_iss;
1438
1439         dev_info(iss->dev, "ISP Revision %08x found\n",
1440                  iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1441
1442         /* Interrupt */
1443         ret = platform_get_irq(pdev, 0);
1444         if (ret <= 0) {
1445                 dev_err(iss->dev, "No IRQ resource\n");
1446                 ret = -ENODEV;
1447                 goto error_iss;
1448         }
1449         iss->irq_num = ret;
1450
1451         if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1452                              "OMAP4 ISS", iss)) {
1453                 dev_err(iss->dev, "Unable to request IRQ\n");
1454                 ret = -EINVAL;
1455                 goto error_iss;
1456         }
1457
1458         /* Entities */
1459         ret = iss_initialize_modules(iss);
1460         if (ret < 0)
1461                 goto error_iss;
1462
1463         ret = iss_register_entities(iss);
1464         if (ret < 0)
1465                 goto error_modules;
1466
1467         omap4iss_put(iss);
1468
1469         return 0;
1470
1471 error_modules:
1472         iss_cleanup_modules(iss);
1473 error_iss:
1474         omap4iss_put(iss);
1475 error:
1476         platform_set_drvdata(pdev, NULL);
1477
1478         mutex_destroy(&iss->iss_mutex);
1479
1480         return ret;
1481 }
1482
1483 static int iss_remove(struct platform_device *pdev)
1484 {
1485         struct iss_device *iss = platform_get_drvdata(pdev);
1486
1487         iss_unregister_entities(iss);
1488         iss_cleanup_modules(iss);
1489
1490         return 0;
1491 }
1492
1493 static const struct platform_device_id omap4iss_id_table[] = {
1494         { "omap4iss", 0 },
1495         { },
1496 };
1497 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1498
1499 static struct platform_driver iss_driver = {
1500         .probe          = iss_probe,
1501         .remove         = iss_remove,
1502         .id_table       = omap4iss_id_table,
1503         .driver = {
1504                 .name   = "omap4iss",
1505         },
1506 };
1507
1508 module_platform_driver(iss_driver);
1509
1510 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1511 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1512 MODULE_LICENSE("GPL");
1513 MODULE_VERSION(ISS_VIDEO_DRIVER_VERSION);