drivers/media/platform/s5p-tv/mixer_drv.c

   1 /*
   2  * Samsung TV Mixer driver
   3  *
   4  * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
   5  *
   6  * Tomasz Stanislawski, <t.stanislaws@samsung.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
  10  * by the Free Software Foundiation. either version 2 of the License,
  11  * or (at your option) any later version
  12  */
  13
  14 #include "mixer.h"
  15
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/irq.h>
  21 #include <linux/fb.h>
  22 #include <linux/delay.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/clk.h>
  25
  26 MODULE_AUTHOR("Tomasz Stanislawski, <t.stanislaws@samsung.com>");
  27 MODULE_DESCRIPTION("Samsung MIXER");
  28 MODULE_LICENSE("GPL");
  29
  30 /* --------- DRIVER PARAMETERS ---------- */
  31
  32 static struct mxr_output_conf mxr_output_conf[] = {
  33         {
  34                 .output_name = "S5P HDMI connector",
  35                 .module_name = "s5p-hdmi",
  36                 .cookie = 1,
  37         },
  38         {
  39                 .output_name = "S5P SDO connector",
  40                 .module_name = "s5p-sdo",
  41                 .cookie = 0,
  42         },
  43 };
  44
  45 void mxr_get_mbus_fmt(struct mxr_device *mdev,
  46         struct v4l2_mbus_framefmt *mbus_fmt)
  47 {
  48         struct v4l2_subdev *sd;
  49         struct v4l2_subdev_format fmt = {
  50                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
  51         };
  52         int ret;
  53
  54         mutex_lock(&mdev->mutex);
  55         sd = to_outsd(mdev);
  56         ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
  57         *mbus_fmt = fmt.format;
  58         WARN(ret, "failed to get mbus_fmt for output %s\n", sd->name);
  59         mutex_unlock(&mdev->mutex);
  60 }
  61
  62 void mxr_streamer_get(struct mxr_device *mdev)
  63 {
  64         mutex_lock(&mdev->mutex);
  65         ++mdev->n_streamer;
  66         mxr_dbg(mdev, "%s(%d)\n", __func__, mdev->n_streamer);
  67         if (mdev->n_streamer == 1) {
  68                 struct v4l2_subdev *sd = to_outsd(mdev);
  69                 struct v4l2_subdev_format fmt = {
  70                         .which = V4L2_SUBDEV_FORMAT_ACTIVE,
  71                 };
  72                 struct v4l2_mbus_framefmt *mbus_fmt = &fmt.format;
  73                 struct mxr_resources *res = &mdev->res;
  74                 int ret;
  75
  76                 if (to_output(mdev)->cookie == 0)
  77                         clk_set_parent(res->sclk_mixer, res->sclk_dac);
  78                 else
  79                         clk_set_parent(res->sclk_mixer, res->sclk_hdmi);
  80                 mxr_reg_s_output(mdev, to_output(mdev)->cookie);
  81
  82                 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
  83                 WARN(ret, "failed to get mbus_fmt for output %s\n", sd->name);
  84                 ret = v4l2_subdev_call(sd, video, s_stream, 1);
  85                 WARN(ret, "starting stream failed for output %s\n", sd->name);
  86
  87                 mxr_reg_set_mbus_fmt(mdev, mbus_fmt);
  88                 mxr_reg_streamon(mdev);
  89                 ret = mxr_reg_wait4vsync(mdev);
  90                 WARN(ret, "failed to get vsync (%d) from output\n", ret);
  91         }
  92         mutex_unlock(&mdev->mutex);
  93         mxr_reg_dump(mdev);
  94         /* FIXME: what to do when streaming fails? */
  95 }
  96
  97 void mxr_streamer_put(struct mxr_device *mdev)
  98 {
  99         mutex_lock(&mdev->mutex);
 100         --mdev->n_streamer;
 101         mxr_dbg(mdev, "%s(%d)\n", __func__, mdev->n_streamer);
 102         if (mdev->n_streamer == 0) {
 103                 int ret;
 104                 struct v4l2_subdev *sd = to_outsd(mdev);
 105
 106                 mxr_reg_streamoff(mdev);
 107                 /* vsync applies Mixer setup */
 108                 ret = mxr_reg_wait4vsync(mdev);
 109                 WARN(ret, "failed to get vsync (%d) from output\n", ret);
 110                 ret = v4l2_subdev_call(sd, video, s_stream, 0);
 111                 WARN(ret, "stopping stream failed for output %s\n", sd->name);
 112         }
 113         WARN(mdev->n_streamer < 0, "negative number of streamers (%d)\n",
 114                 mdev->n_streamer);
 115         mutex_unlock(&mdev->mutex);
 116         mxr_reg_dump(mdev);
 117 }
 118
 119 void mxr_output_get(struct mxr_device *mdev)
 120 {
 121         mutex_lock(&mdev->mutex);
 122         ++mdev->n_output;
 123         mxr_dbg(mdev, "%s(%d)\n", __func__, mdev->n_output);
 124         /* turn on auxiliary driver */
 125         if (mdev->n_output == 1)
 126                 v4l2_subdev_call(to_outsd(mdev), core, s_power, 1);
 127         mutex_unlock(&mdev->mutex);
 128 }
 129
 130 void mxr_output_put(struct mxr_device *mdev)
 131 {
 132         mutex_lock(&mdev->mutex);
 133         --mdev->n_output;
 134         mxr_dbg(mdev, "%s(%d)\n", __func__, mdev->n_output);
 135         /* turn on auxiliary driver */
 136         if (mdev->n_output == 0)
 137                 v4l2_subdev_call(to_outsd(mdev), core, s_power, 0);
 138         WARN(mdev->n_output < 0, "negative number of output users (%d)\n",
 139                 mdev->n_output);
 140         mutex_unlock(&mdev->mutex);
 141 }
 142
 143 int mxr_power_get(struct mxr_device *mdev)
 144 {
 145         int ret = pm_runtime_get_sync(mdev->dev);
 146
 147         /* returning 1 means that power is already enabled,
 148          * so zero success be returned */
 149         if (IS_ERR_VALUE(ret))
 150                 return ret;
 151         return 0;
 152 }
 153
 154 void mxr_power_put(struct mxr_device *mdev)
 155 {
 156         pm_runtime_put_sync(mdev->dev);
 157 }
 158
 159 /* --------- RESOURCE MANAGEMENT -------------*/
 160
 161 static int mxr_acquire_plat_resources(struct mxr_device *mdev,
 162                                       struct platform_device *pdev)
 163 {
 164         struct resource *res;
 165         int ret;
 166
 167         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mxr");
 168         if (res == NULL) {
 169                 mxr_err(mdev, "get memory resource failed.\n");
 170                 ret = -ENXIO;
 171                 goto fail;
 172         }
 173
 174         mdev->res.mxr_regs = ioremap(res->start, resource_size(res));
 175         if (mdev->res.mxr_regs == NULL) {
 176                 mxr_err(mdev, "register mapping failed.\n");
 177                 ret = -ENXIO;
 178                 goto fail;
 179         }
 180
 181         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vp");
 182         if (res == NULL) {
 183                 mxr_err(mdev, "get memory resource failed.\n");
 184                 ret = -ENXIO;
 185                 goto fail_mxr_regs;
 186         }
 187
 188         mdev->res.vp_regs = ioremap(res->start, resource_size(res));
 189         if (mdev->res.vp_regs == NULL) {
 190                 mxr_err(mdev, "register mapping failed.\n");
 191                 ret = -ENXIO;
 192                 goto fail_mxr_regs;
 193         }
 194
 195         res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "irq");
 196         if (res == NULL) {
 197                 mxr_err(mdev, "get interrupt resource failed.\n");
 198                 ret = -ENXIO;
 199                 goto fail_vp_regs;
 200         }
 201
 202         ret = request_irq(res->start, mxr_irq_handler, 0, "s5p-mixer", mdev);
 203         if (ret) {
 204                 mxr_err(mdev, "request interrupt failed.\n");
 205                 goto fail_vp_regs;
 206         }
 207         mdev->res.irq = res->start;
 208
 209         return 0;
 210
 211 fail_vp_regs:
 212         iounmap(mdev->res.vp_regs);
 213
 214 fail_mxr_regs:
 215         iounmap(mdev->res.mxr_regs);
 216
 217 fail:
 218         return ret;
 219 }
 220
 221 static void mxr_resource_clear_clocks(struct mxr_resources *res)
 222 {
 223         res->mixer      = ERR_PTR(-EINVAL);
 224         res->vp         = ERR_PTR(-EINVAL);
 225         res->sclk_mixer = ERR_PTR(-EINVAL);
 226         res->sclk_hdmi  = ERR_PTR(-EINVAL);
 227         res->sclk_dac   = ERR_PTR(-EINVAL);
 228 }
 229
 230 static void mxr_release_plat_resources(struct mxr_device *mdev)
 231 {
 232         free_irq(mdev->res.irq, mdev);
 233         iounmap(mdev->res.vp_regs);
 234         iounmap(mdev->res.mxr_regs);
 235 }
 236
 237 static void mxr_release_clocks(struct mxr_device *mdev)
 238 {
 239         struct mxr_resources *res = &mdev->res;
 240
 241         if (!IS_ERR(res->sclk_dac))
 242                 clk_put(res->sclk_dac);
 243         if (!IS_ERR(res->sclk_hdmi))
 244                 clk_put(res->sclk_hdmi);
 245         if (!IS_ERR(res->sclk_mixer))
 246                 clk_put(res->sclk_mixer);
 247         if (!IS_ERR(res->vp))
 248                 clk_put(res->vp);
 249         if (!IS_ERR(res->mixer))
 250                 clk_put(res->mixer);
 251 }
 252
 253 static int mxr_acquire_clocks(struct mxr_device *mdev)
 254 {
 255         struct mxr_resources *res = &mdev->res;
 256         struct device *dev = mdev->dev;
 257
 258         mxr_resource_clear_clocks(res);
 259
 260         res->mixer = clk_get(dev, "mixer");
 261         if (IS_ERR(res->mixer)) {
 262                 mxr_err(mdev, "failed to get clock 'mixer'\n");
 263                 goto fail;
 264         }
 265         res->vp = clk_get(dev, "vp");
 266         if (IS_ERR(res->vp)) {
 267                 mxr_err(mdev, "failed to get clock 'vp'\n");
 268                 goto fail;
 269         }
 270         res->sclk_mixer = clk_get(dev, "sclk_mixer");
 271         if (IS_ERR(res->sclk_mixer)) {
 272                 mxr_err(mdev, "failed to get clock 'sclk_mixer'\n");
 273                 goto fail;
 274         }
 275         res->sclk_hdmi = clk_get(dev, "sclk_hdmi");
 276         if (IS_ERR(res->sclk_hdmi)) {
 277                 mxr_err(mdev, "failed to get clock 'sclk_hdmi'\n");
 278                 goto fail;
 279         }
 280         res->sclk_dac = clk_get(dev, "sclk_dac");
 281         if (IS_ERR(res->sclk_dac)) {
 282                 mxr_err(mdev, "failed to get clock 'sclk_dac'\n");
 283                 goto fail;
 284         }
 285
 286         return 0;
 287 fail:
 288         mxr_release_clocks(mdev);
 289         return -ENODEV;
 290 }
 291
 292 static int mxr_acquire_resources(struct mxr_device *mdev,
 293                                  struct platform_device *pdev)
 294 {
 295         int ret;
 296         ret = mxr_acquire_plat_resources(mdev, pdev);
 297
 298         if (ret)
 299                 goto fail;
 300
 301         ret = mxr_acquire_clocks(mdev);
 302         if (ret)
 303                 goto fail_plat;
 304
 305         mxr_info(mdev, "resources acquired\n");
 306         return 0;
 307
 308 fail_plat:
 309         mxr_release_plat_resources(mdev);
 310 fail:
 311         mxr_err(mdev, "resources acquire failed\n");
 312         return ret;
 313 }
 314
 315 static void mxr_release_resources(struct mxr_device *mdev)
 316 {
 317         mxr_release_clocks(mdev);
 318         mxr_release_plat_resources(mdev);
 319         memset(&mdev->res, 0, sizeof(mdev->res));
 320         mxr_resource_clear_clocks(&mdev->res);
 321 }
 322
 323 static void mxr_release_layers(struct mxr_device *mdev)
 324 {
 325         int i;
 326
 327         for (i = 0; i < ARRAY_SIZE(mdev->layer); ++i)
 328                 if (mdev->layer[i])
 329                         mxr_layer_release(mdev->layer[i]);
 330 }
 331
 332 static int mxr_acquire_layers(struct mxr_device *mdev,
 333                               struct mxr_platform_data *pdata)
 334 {
 335         mdev->layer[0] = mxr_graph_layer_create(mdev, 0);
 336         mdev->layer[1] = mxr_graph_layer_create(mdev, 1);
 337         mdev->layer[2] = mxr_vp_layer_create(mdev, 0);
 338
 339         if (!mdev->layer[0] || !mdev->layer[1] || !mdev->layer[2]) {
 340                 mxr_err(mdev, "failed to acquire layers\n");
 341                 goto fail;
 342         }
 343
 344         return 0;
 345
 346 fail:
 347         mxr_release_layers(mdev);
 348         return -ENODEV;
 349 }
 350
 351 /* ---------- POWER MANAGEMENT ----------- */
 352
 353 static int mxr_runtime_resume(struct device *dev)
 354 {
 355         struct mxr_device *mdev = to_mdev(dev);
 356         struct mxr_resources *res = &mdev->res;
 357         int ret;
 358
 359         mxr_dbg(mdev, "resume - start\n");
 360         mutex_lock(&mdev->mutex);
 361         /* turn clocks on */
 362         ret = clk_prepare_enable(res->mixer);
 363         if (ret < 0) {
 364                 dev_err(mdev->dev, "clk_prepare_enable(mixer) failed\n");
 365                 goto fail;
 366         }
 367         ret = clk_prepare_enable(res->vp);
 368         if (ret < 0) {
 369                 dev_err(mdev->dev, "clk_prepare_enable(vp) failed\n");
 370                 goto fail_mixer;
 371         }
 372         ret = clk_prepare_enable(res->sclk_mixer);
 373         if (ret < 0) {
 374                 dev_err(mdev->dev, "clk_prepare_enable(sclk_mixer) failed\n");
 375                 goto fail_vp;
 376         }
 377         /* apply default configuration */
 378         mxr_reg_reset(mdev);
 379         mxr_dbg(mdev, "resume - finished\n");
 380
 381         mutex_unlock(&mdev->mutex);
 382         return 0;
 383
 384 fail_vp:
 385         clk_disable_unprepare(res->vp);
 386 fail_mixer:
 387         clk_disable_unprepare(res->mixer);
 388 fail:
 389         mutex_unlock(&mdev->mutex);
 390         dev_err(mdev->dev, "resume failed\n");
 391         return ret;
 392 }
 393
 394 static int mxr_runtime_suspend(struct device *dev)
 395 {
 396         struct mxr_device *mdev = to_mdev(dev);
 397         struct mxr_resources *res = &mdev->res;
 398         mxr_dbg(mdev, "suspend - start\n");
 399         mutex_lock(&mdev->mutex);
 400         /* turn clocks off */
 401         clk_disable_unprepare(res->sclk_mixer);
 402         clk_disable_unprepare(res->vp);
 403         clk_disable_unprepare(res->mixer);
 404         mutex_unlock(&mdev->mutex);
 405         mxr_dbg(mdev, "suspend - finished\n");
 406         return 0;
 407 }
 408
 409 static const struct dev_pm_ops mxr_pm_ops = {
 410         .runtime_suspend = mxr_runtime_suspend,
 411         .runtime_resume  = mxr_runtime_resume,
 412 };
 413
 414 /* --------- DRIVER INITIALIZATION ---------- */
 415
 416 static int mxr_probe(struct platform_device *pdev)
 417 {
 418         struct device *dev = &pdev->dev;
 419         struct mxr_platform_data *pdata = dev->platform_data;
 420         struct mxr_device *mdev;
 421         int ret;
 422
 423         /* mdev does not exist yet so no mxr_dbg is used */
 424         dev_info(dev, "probe start\n");
 425
 426         mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
 427         if (!mdev) {
 428                 dev_err(dev, "not enough memory.\n");
 429                 ret = -ENOMEM;
 430                 goto fail;
 431         }
 432
 433         /* setup pointer to master device */
 434         mdev->dev = dev;
 435
 436         mutex_init(&mdev->mutex);
 437         spin_lock_init(&mdev->reg_slock);
 438         init_waitqueue_head(&mdev->event_queue);
 439
 440         /* acquire resources: regs, irqs, clocks, regulators */
 441         ret = mxr_acquire_resources(mdev, pdev);
 442         if (ret)
 443                 goto fail_mem;
 444
 445         /* configure resources for video output */
 446         ret = mxr_acquire_video(mdev, mxr_output_conf,
 447                 ARRAY_SIZE(mxr_output_conf));
 448         if (ret)
 449                 goto fail_resources;
 450
 451         /* configure layers */
 452         ret = mxr_acquire_layers(mdev, pdata);
 453         if (ret)
 454                 goto fail_video;
 455
 456         pm_runtime_enable(dev);
 457
 458         mxr_info(mdev, "probe successful\n");
 459         return 0;
 460
 461 fail_video:
 462         mxr_release_video(mdev);
 463
 464 fail_resources:
 465         mxr_release_resources(mdev);
 466
 467 fail_mem:
 468         kfree(mdev);
 469
 470 fail:
 471         dev_info(dev, "probe failed\n");
 472         return ret;
 473 }
 474
 475 static int mxr_remove(struct platform_device *pdev)
 476 {
 477         struct device *dev = &pdev->dev;
 478         struct mxr_device *mdev = to_mdev(dev);
 479
 480         pm_runtime_disable(dev);
 481
 482         mxr_release_layers(mdev);
 483         mxr_release_video(mdev);
 484         mxr_release_resources(mdev);
 485
 486         kfree(mdev);
 487
 488         dev_info(dev, "remove successful\n");
 489         return 0;
 490 }
 491
 492 static struct platform_driver mxr_driver __refdata = {
 493         .probe = mxr_probe,
 494         .remove = mxr_remove,
 495         .driver = {
 496                 .name = MXR_DRIVER_NAME,
 497                 .pm = &mxr_pm_ops,
 498         }
 499 };
 500
 501 static int __init mxr_init(void)
 502 {
 503         int i, ret;
 504         static const char banner[] __initconst =
 505                 "Samsung TV Mixer driver, "
 506                 "(c) 2010-2011 Samsung Electronics Co., Ltd.\n";
 507         pr_info("%s\n", banner);
 508
 509         /* Loading auxiliary modules */
 510         for (i = 0; i < ARRAY_SIZE(mxr_output_conf); ++i)
 511                 request_module(mxr_output_conf[i].module_name);
 512
 513         ret = platform_driver_register(&mxr_driver);
 514         if (ret != 0) {
 515                 pr_err("s5p-tv: registration of MIXER driver failed\n");
 516                 return -ENXIO;
 517         }
 518
 519         return 0;
 520 }
 521 module_init(mxr_init);
 522
 523 static void __exit mxr_exit(void)
 524 {
 525         platform_driver_unregister(&mxr_driver);
 526 }
 527 module_exit(mxr_exit);