drivers/media/platform/vsp1/vsp1_drv.c

   1 /*
   2  * vsp1_drv.c  --  R-Car VSP1 Driver
   3  *
   4  * Copyright (C) 2013 Renesas Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.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/interrupt.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/videodev2.h>
  21
  22 #include "vsp1.h"
  23 #include "vsp1_lif.h"
  24 #include "vsp1_rwpf.h"
  25 #include "vsp1_uds.h"
  26
  27 /* -----------------------------------------------------------------------------
  28  * Interrupt Handling
  29  */
  30
  31 static irqreturn_t vsp1_irq_handler(int irq, void *data)
  32 {
  33         u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;
  34         struct vsp1_device *vsp1 = data;
  35         irqreturn_t ret = IRQ_NONE;
  36         unsigned int i;
  37
  38         for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
  39                 struct vsp1_rwpf *wpf = vsp1->wpf[i];
  40                 struct vsp1_pipeline *pipe;
  41                 u32 status;
  42
  43                 if (wpf == NULL)
  44                         continue;
  45
  46                 pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
  47                 status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));
  48                 vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);
  49
  50                 if (status & VI6_WFP_IRQ_STA_FRE) {
  51                         vsp1_pipeline_frame_end(pipe);
  52                         ret = IRQ_HANDLED;
  53                 }
  54         }
  55
  56         return ret;
  57 }
  58
  59 /* -----------------------------------------------------------------------------
  60  * Entities
  61  */
  62
  63 /*
  64  * vsp1_create_links - Create links from all sources to the given sink
  65  *
  66  * This function creates media links from all valid sources to the given sink
  67  * pad. Links that would be invalid according to the VSP1 hardware capabilities
  68  * are skipped. Those include all links
  69  *
  70  * - from a UDS to a UDS (UDS entities can't be chained)
  71  * - from an entity to itself (no loops are allowed)
  72  */
  73 static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)
  74 {
  75         struct media_entity *entity = &sink->subdev.entity;
  76         struct vsp1_entity *source;
  77         unsigned int pad;
  78         int ret;
  79
  80         list_for_each_entry(source, &vsp1->entities, list_dev) {
  81                 u32 flags;
  82
  83                 if (source->type == sink->type)
  84                         continue;
  85
  86                 if (source->type == VSP1_ENTITY_LIF ||
  87                     source->type == VSP1_ENTITY_WPF)
  88                         continue;
  89
  90                 flags = source->type == VSP1_ENTITY_RPF &&
  91                         sink->type == VSP1_ENTITY_WPF &&
  92                         source->index == sink->index
  93                       ? MEDIA_LNK_FL_ENABLED : 0;
  94
  95                 for (pad = 0; pad < entity->num_pads; ++pad) {
  96                         if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))
  97                                 continue;
  98
  99                         ret = media_entity_create_link(&source->subdev.entity,
 100                                                        source->source_pad,
 101                                                        entity, pad, flags);
 102                         if (ret < 0)
 103                                 return ret;
 104
 105                         if (flags & MEDIA_LNK_FL_ENABLED)
 106                                 source->sink = entity;
 107                 }
 108         }
 109
 110         return 0;
 111 }
 112
 113 static void vsp1_destroy_entities(struct vsp1_device *vsp1)
 114 {
 115         struct vsp1_entity *entity;
 116         struct vsp1_entity *next;
 117
 118         list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) {
 119                 list_del(&entity->list_dev);
 120                 vsp1_entity_destroy(entity);
 121         }
 122
 123         v4l2_device_unregister(&vsp1->v4l2_dev);
 124         media_device_unregister(&vsp1->media_dev);
 125 }
 126
 127 static int vsp1_create_entities(struct vsp1_device *vsp1)
 128 {
 129         struct media_device *mdev = &vsp1->media_dev;
 130         struct v4l2_device *vdev = &vsp1->v4l2_dev;
 131         struct vsp1_entity *entity;
 132         unsigned int i;
 133         int ret;
 134
 135         mdev->dev = vsp1->dev;
 136         strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
 137         snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
 138                  dev_name(mdev->dev));
 139         ret = media_device_register(mdev);
 140         if (ret < 0) {
 141                 dev_err(vsp1->dev, "media device registration failed (%d)\n",
 142                         ret);
 143                 return ret;
 144         }
 145
 146         vdev->mdev = mdev;
 147         ret = v4l2_device_register(vsp1->dev, vdev);
 148         if (ret < 0) {
 149                 dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",
 150                         ret);
 151                 goto done;
 152         }
 153
 154         /* Instantiate all the entities. */
 155         if (vsp1->pdata->features & VSP1_HAS_LIF) {
 156                 vsp1->lif = vsp1_lif_create(vsp1);
 157                 if (IS_ERR(vsp1->lif)) {
 158                         ret = PTR_ERR(vsp1->lif);
 159                         goto done;
 160                 }
 161
 162                 list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);
 163         }
 164
 165         for (i = 0; i < vsp1->pdata->rpf_count; ++i) {
 166                 struct vsp1_rwpf *rpf;
 167
 168                 rpf = vsp1_rpf_create(vsp1, i);
 169                 if (IS_ERR(rpf)) {
 170                         ret = PTR_ERR(rpf);
 171                         goto done;
 172                 }
 173
 174                 vsp1->rpf[i] = rpf;
 175                 list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
 176         }
 177
 178         for (i = 0; i < vsp1->pdata->uds_count; ++i) {
 179                 struct vsp1_uds *uds;
 180
 181                 uds = vsp1_uds_create(vsp1, i);
 182                 if (IS_ERR(uds)) {
 183                         ret = PTR_ERR(uds);
 184                         goto done;
 185                 }
 186
 187                 vsp1->uds[i] = uds;
 188                 list_add_tail(&uds->entity.list_dev, &vsp1->entities);
 189         }
 190
 191         for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
 192                 struct vsp1_rwpf *wpf;
 193
 194                 wpf = vsp1_wpf_create(vsp1, i);
 195                 if (IS_ERR(wpf)) {
 196                         ret = PTR_ERR(wpf);
 197                         goto done;
 198                 }
 199
 200                 vsp1->wpf[i] = wpf;
 201                 list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
 202         }
 203
 204         /* Create links. */
 205         list_for_each_entry(entity, &vsp1->entities, list_dev) {
 206                 if (entity->type == VSP1_ENTITY_LIF ||
 207                     entity->type == VSP1_ENTITY_RPF)
 208                         continue;
 209
 210                 ret = vsp1_create_links(vsp1, entity);
 211                 if (ret < 0)
 212                         goto done;
 213         }
 214
 215         if (vsp1->pdata->features & VSP1_HAS_LIF) {
 216                 ret = media_entity_create_link(
 217                         &vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,
 218                         &vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);
 219                 if (ret < 0)
 220                         return ret;
 221         }
 222
 223         /* Register all subdevs. */
 224         list_for_each_entry(entity, &vsp1->entities, list_dev) {
 225                 ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,
 226                                                   &entity->subdev);
 227                 if (ret < 0)
 228                         goto done;
 229         }
 230
 231         ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);
 232
 233 done:
 234         if (ret < 0)
 235                 vsp1_destroy_entities(vsp1);
 236
 237         return ret;
 238 }
 239
 240 static int vsp1_device_init(struct vsp1_device *vsp1)
 241 {
 242         unsigned int i;
 243         u32 status;
 244
 245         /* Reset any channel that might be running. */
 246         status = vsp1_read(vsp1, VI6_STATUS);
 247
 248         for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
 249                 unsigned int timeout;
 250
 251                 if (!(status & VI6_STATUS_SYS_ACT(i)))
 252                         continue;
 253
 254                 vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));
 255                 for (timeout = 10; timeout > 0; --timeout) {
 256                         status = vsp1_read(vsp1, VI6_STATUS);
 257                         if (!(status & VI6_STATUS_SYS_ACT(i)))
 258                                 break;
 259
 260                         usleep_range(1000, 2000);
 261                 }
 262
 263                 if (!timeout) {
 264                         dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);
 265                         return -ETIMEDOUT;
 266                 }
 267         }
 268
 269         vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |
 270                    (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));
 271
 272         for (i = 0; i < vsp1->pdata->rpf_count; ++i)
 273                 vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);
 274
 275         for (i = 0; i < vsp1->pdata->uds_count; ++i)
 276                 vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);
 277
 278         vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);
 279         vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);
 280         vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);
 281         vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);
 282         vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);
 283         vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);
 284
 285         vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
 286                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
 287         vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
 288                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
 289
 290         return 0;
 291 }
 292
 293 static int vsp1_clocks_enable(struct vsp1_device *vsp1)
 294 {
 295         int ret;
 296
 297         ret = clk_prepare_enable(vsp1->clock);
 298         if (ret < 0)
 299                 return ret;
 300
 301         if (IS_ERR(vsp1->rt_clock))
 302                 return 0;
 303
 304         ret = clk_prepare_enable(vsp1->rt_clock);
 305         if (ret < 0) {
 306                 clk_disable_unprepare(vsp1->clock);
 307                 return ret;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static void vsp1_clocks_disable(struct vsp1_device *vsp1)
 314 {
 315         if (!IS_ERR(vsp1->rt_clock))
 316                 clk_disable_unprepare(vsp1->rt_clock);
 317         clk_disable_unprepare(vsp1->clock);
 318 }
 319
 320 /*
 321  * vsp1_device_get - Acquire the VSP1 device
 322  *
 323  * Increment the VSP1 reference count and initialize the device if the first
 324  * reference is taken.
 325  *
 326  * Return a pointer to the VSP1 device or NULL if an error occured.
 327  */
 328 struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1)
 329 {
 330         struct vsp1_device *__vsp1 = vsp1;
 331         int ret;
 332
 333         mutex_lock(&vsp1->lock);
 334         if (vsp1->ref_count > 0)
 335                 goto done;
 336
 337         ret = vsp1_clocks_enable(vsp1);
 338         if (ret < 0) {
 339                 __vsp1 = NULL;
 340                 goto done;
 341         }
 342
 343         ret = vsp1_device_init(vsp1);
 344         if (ret < 0) {
 345                 vsp1_clocks_disable(vsp1);
 346                 __vsp1 = NULL;
 347                 goto done;
 348         }
 349
 350 done:
 351         if (__vsp1)
 352                 vsp1->ref_count++;
 353
 354         mutex_unlock(&vsp1->lock);
 355         return __vsp1;
 356 }
 357
 358 /*
 359  * vsp1_device_put - Release the VSP1 device
 360  *
 361  * Decrement the VSP1 reference count and cleanup the device if the last
 362  * reference is released.
 363  */
 364 void vsp1_device_put(struct vsp1_device *vsp1)
 365 {
 366         mutex_lock(&vsp1->lock);
 367
 368         if (--vsp1->ref_count == 0)
 369                 vsp1_clocks_disable(vsp1);
 370
 371         mutex_unlock(&vsp1->lock);
 372 }
 373
 374 /* -----------------------------------------------------------------------------
 375  * Power Management
 376  */
 377
 378 #ifdef CONFIG_PM_SLEEP
 379 static int vsp1_pm_suspend(struct device *dev)
 380 {
 381         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
 382
 383         WARN_ON(mutex_is_locked(&vsp1->lock));
 384
 385         if (vsp1->ref_count == 0)
 386                 return 0;
 387
 388         vsp1_clocks_disable(vsp1);
 389         return 0;
 390 }
 391
 392 static int vsp1_pm_resume(struct device *dev)
 393 {
 394         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
 395
 396         WARN_ON(mutex_is_locked(&vsp1->lock));
 397
 398         if (vsp1->ref_count)
 399                 return 0;
 400
 401         return vsp1_clocks_enable(vsp1);
 402 }
 403 #endif
 404
 405 static const struct dev_pm_ops vsp1_pm_ops = {
 406         SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
 407 };
 408
 409 /* -----------------------------------------------------------------------------
 410  * Platform Driver
 411  */
 412
 413 static struct vsp1_platform_data *
 414 vsp1_get_platform_data(struct platform_device *pdev)
 415 {
 416         struct vsp1_platform_data *pdata = pdev->dev.platform_data;
 417
 418         if (pdata == NULL) {
 419                 dev_err(&pdev->dev, "missing platform data\n");
 420                 return NULL;
 421         }
 422
 423         if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) {
 424                 dev_err(&pdev->dev, "invalid number of RPF (%u)\n",
 425                         pdata->rpf_count);
 426                 return NULL;
 427         }
 428
 429         if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) {
 430                 dev_err(&pdev->dev, "invalid number of UDS (%u)\n",
 431                         pdata->uds_count);
 432                 return NULL;
 433         }
 434
 435         if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) {
 436                 dev_err(&pdev->dev, "invalid number of WPF (%u)\n",
 437                         pdata->wpf_count);
 438                 return NULL;
 439         }
 440
 441         return pdata;
 442 }
 443
 444 static int vsp1_probe(struct platform_device *pdev)
 445 {
 446         struct vsp1_device *vsp1;
 447         struct resource *irq;
 448         struct resource *io;
 449         int ret;
 450
 451         vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
 452         if (vsp1 == NULL)
 453                 return -ENOMEM;
 454
 455         vsp1->dev = &pdev->dev;
 456         mutex_init(&vsp1->lock);
 457         INIT_LIST_HEAD(&vsp1->entities);
 458
 459         vsp1->pdata = vsp1_get_platform_data(pdev);
 460         if (vsp1->pdata == NULL)
 461                 return -ENODEV;
 462
 463         /* I/O, IRQ and clock resources */
 464         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 465         vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
 466         if (IS_ERR(vsp1->mmio))
 467                 return PTR_ERR(vsp1->mmio);
 468
 469         vsp1->clock = devm_clk_get(&pdev->dev, NULL);
 470         if (IS_ERR(vsp1->clock)) {
 471                 dev_err(&pdev->dev, "failed to get clock\n");
 472                 return PTR_ERR(vsp1->clock);
 473         }
 474
 475         /* The RT clock is optional */
 476         vsp1->rt_clock = devm_clk_get(&pdev->dev, "rt");
 477
 478         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 479         if (!irq) {
 480                 dev_err(&pdev->dev, "missing IRQ\n");
 481                 return -EINVAL;
 482         }
 483
 484         ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
 485                               IRQF_SHARED, dev_name(&pdev->dev), vsp1);
 486         if (ret < 0) {
 487                 dev_err(&pdev->dev, "failed to request IRQ\n");
 488                 return ret;
 489         }
 490
 491         /* Instanciate entities */
 492         ret = vsp1_create_entities(vsp1);
 493         if (ret < 0) {
 494                 dev_err(&pdev->dev, "failed to create entities\n");
 495                 return ret;
 496         }
 497
 498         platform_set_drvdata(pdev, vsp1);
 499
 500         return 0;
 501 }
 502
 503 static int vsp1_remove(struct platform_device *pdev)
 504 {
 505         struct vsp1_device *vsp1 = platform_get_drvdata(pdev);
 506
 507         vsp1_destroy_entities(vsp1);
 508
 509         return 0;
 510 }
 511
 512 static struct platform_driver vsp1_platform_driver = {
 513         .probe          = vsp1_probe,
 514         .remove         = vsp1_remove,
 515         .driver         = {
 516                 .owner  = THIS_MODULE,
 517                 .name   = "vsp1",
 518                 .pm     = &vsp1_pm_ops,
 519         },
 520 };
 521
 522 module_platform_driver(vsp1_platform_driver);
 523
 524 MODULE_ALIAS("vsp1");
 525 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 526 MODULE_DESCRIPTION("Renesas VSP1 Driver");
 527 MODULE_LICENSE("GPL");