drivers/gpu/drm/arm/malidp_drv.c

   1 /*
   2  * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
   3  * Author: Liviu Dudau <Liviu.Dudau@arm.com>
   4  *
   5  * This program is free software and is provided to you under the terms of the
   6  * GNU General Public License version 2 as published by the Free Software
   7  * Foundation, and any use by you of this program is subject to the terms
   8  * of such GNU licence.
   9  *
  10  * ARM Mali DP500/DP550/DP650 KMS/DRM driver
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/clk.h>
  15 #include <linux/component.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_graph.h>
  18 #include <linux/of_reserved_mem.h>
  19
  20 #include <drm/drmP.h>
  21 #include <drm/drm_atomic.h>
  22 #include <drm/drm_atomic_helper.h>
  23 #include <drm/drm_crtc.h>
  24 #include <drm/drm_crtc_helper.h>
  25 #include <drm/drm_fb_helper.h>
  26 #include <drm/drm_fb_cma_helper.h>
  27 #include <drm/drm_gem_cma_helper.h>
  28 #include <drm/drm_of.h>
  29
  30 #include "malidp_drv.h"
  31 #include "malidp_regs.h"
  32 #include "malidp_hw.h"
  33
  34 #define MALIDP_CONF_VALID_TIMEOUT       250
  35
  36 /*
  37  * set the "config valid" bit and wait until the hardware acts on it
  38  */
  39 static int malidp_set_and_wait_config_valid(struct drm_device *drm)
  40 {
  41         struct malidp_drm *malidp = drm->dev_private;
  42         struct malidp_hw_device *hwdev = malidp->dev;
  43         int ret;
  44
  45         hwdev->set_config_valid(hwdev);
  46         /* don't wait for config_valid flag if we are in config mode */
  47         if (hwdev->in_config_mode(hwdev))
  48                 return 0;
  49
  50         ret = wait_event_interruptible_timeout(malidp->wq,
  51                         atomic_read(&malidp->config_valid) == 1,
  52                         msecs_to_jiffies(MALIDP_CONF_VALID_TIMEOUT));
  53
  54         return (ret > 0) ? 0 : -ETIMEDOUT;
  55 }
  56
  57 static void malidp_output_poll_changed(struct drm_device *drm)
  58 {
  59         struct malidp_drm *malidp = drm->dev_private;
  60
  61         drm_fbdev_cma_hotplug_event(malidp->fbdev);
  62 }
  63
  64 static void malidp_atomic_commit_hw_done(struct drm_atomic_state *state)
  65 {
  66         struct drm_pending_vblank_event *event;
  67         struct drm_device *drm = state->dev;
  68         struct malidp_drm *malidp = drm->dev_private;
  69         int ret = malidp_set_and_wait_config_valid(drm);
  70
  71         if (ret)
  72                 DRM_DEBUG_DRIVER("timed out waiting for updated configuration\n");
  73
  74         event = malidp->crtc.state->event;
  75         if (event) {
  76                 malidp->crtc.state->event = NULL;
  77
  78                 spin_lock_irq(&drm->event_lock);
  79                 if (drm_crtc_vblank_get(&malidp->crtc) == 0)
  80                         drm_crtc_arm_vblank_event(&malidp->crtc, event);
  81                 else
  82                         drm_crtc_send_vblank_event(&malidp->crtc, event);
  83                 spin_unlock_irq(&drm->event_lock);
  84         }
  85         drm_atomic_helper_commit_hw_done(state);
  86 }
  87
  88 static void malidp_atomic_commit_tail(struct drm_atomic_state *state)
  89 {
  90         struct drm_device *drm = state->dev;
  91
  92         drm_atomic_helper_commit_modeset_disables(drm, state);
  93         drm_atomic_helper_commit_modeset_enables(drm, state);
  94         drm_atomic_helper_commit_planes(drm, state, true);
  95
  96         malidp_atomic_commit_hw_done(state);
  97
  98         drm_atomic_helper_wait_for_vblanks(drm, state);
  99
 100         drm_atomic_helper_cleanup_planes(drm, state);
 101 }
 102
 103 static struct drm_mode_config_helper_funcs malidp_mode_config_helpers = {
 104         .atomic_commit_tail = malidp_atomic_commit_tail,
 105 };
 106
 107 static const struct drm_mode_config_funcs malidp_mode_config_funcs = {
 108         .fb_create = drm_fb_cma_create,
 109         .output_poll_changed = malidp_output_poll_changed,
 110         .atomic_check = drm_atomic_helper_check,
 111         .atomic_commit = drm_atomic_helper_commit,
 112 };
 113
 114 static int malidp_enable_vblank(struct drm_device *drm, unsigned int crtc)
 115 {
 116         struct malidp_drm *malidp = drm->dev_private;
 117         struct malidp_hw_device *hwdev = malidp->dev;
 118
 119         malidp_hw_enable_irq(hwdev, MALIDP_DE_BLOCK,
 120                              hwdev->map.de_irq_map.vsync_irq);
 121         return 0;
 122 }
 123
 124 static void malidp_disable_vblank(struct drm_device *drm, unsigned int pipe)
 125 {
 126         struct malidp_drm *malidp = drm->dev_private;
 127         struct malidp_hw_device *hwdev = malidp->dev;
 128
 129         malidp_hw_disable_irq(hwdev, MALIDP_DE_BLOCK,
 130                               hwdev->map.de_irq_map.vsync_irq);
 131 }
 132
 133 static int malidp_init(struct drm_device *drm)
 134 {
 135         int ret;
 136         struct malidp_drm *malidp = drm->dev_private;
 137         struct malidp_hw_device *hwdev = malidp->dev;
 138
 139         drm_mode_config_init(drm);
 140
 141         drm->mode_config.min_width = hwdev->min_line_size;
 142         drm->mode_config.min_height = hwdev->min_line_size;
 143         drm->mode_config.max_width = hwdev->max_line_size;
 144         drm->mode_config.max_height = hwdev->max_line_size;
 145         drm->mode_config.funcs = &malidp_mode_config_funcs;
 146         drm->mode_config.helper_private = &malidp_mode_config_helpers;
 147
 148         ret = malidp_crtc_init(drm);
 149         if (ret) {
 150                 drm_mode_config_cleanup(drm);
 151                 return ret;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int malidp_irq_init(struct platform_device *pdev)
 158 {
 159         int irq_de, irq_se, ret = 0;
 160         struct drm_device *drm = dev_get_drvdata(&pdev->dev);
 161
 162         /* fetch the interrupts from DT */
 163         irq_de = platform_get_irq_byname(pdev, "DE");
 164         if (irq_de < 0) {
 165                 DRM_ERROR("no 'DE' IRQ specified!\n");
 166                 return irq_de;
 167         }
 168         irq_se = platform_get_irq_byname(pdev, "SE");
 169         if (irq_se < 0) {
 170                 DRM_ERROR("no 'SE' IRQ specified!\n");
 171                 return irq_se;
 172         }
 173
 174         ret = malidp_de_irq_init(drm, irq_de);
 175         if (ret)
 176                 return ret;
 177
 178         ret = malidp_se_irq_init(drm, irq_se);
 179         if (ret) {
 180                 malidp_de_irq_fini(drm);
 181                 return ret;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static void malidp_lastclose(struct drm_device *drm)
 188 {
 189         struct malidp_drm *malidp = drm->dev_private;
 190
 191         drm_fbdev_cma_restore_mode(malidp->fbdev);
 192 }
 193
 194 static const struct file_operations fops = {
 195         .owner = THIS_MODULE,
 196         .open = drm_open,
 197         .release = drm_release,
 198         .unlocked_ioctl = drm_ioctl,
 199 #ifdef CONFIG_COMPAT
 200         .compat_ioctl = drm_compat_ioctl,
 201 #endif
 202         .poll = drm_poll,
 203         .read = drm_read,
 204         .llseek = noop_llseek,
 205         .mmap = drm_gem_cma_mmap,
 206 };
 207
 208 static struct drm_driver malidp_driver = {
 209         .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
 210                            DRIVER_PRIME,
 211         .lastclose = malidp_lastclose,
 212         .get_vblank_counter = drm_vblank_no_hw_counter,
 213         .enable_vblank = malidp_enable_vblank,
 214         .disable_vblank = malidp_disable_vblank,
 215         .gem_free_object_unlocked = drm_gem_cma_free_object,
 216         .gem_vm_ops = &drm_gem_cma_vm_ops,
 217         .dumb_create = drm_gem_cma_dumb_create,
 218         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 219         .dumb_destroy = drm_gem_dumb_destroy,
 220         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 221         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 222         .gem_prime_export = drm_gem_prime_export,
 223         .gem_prime_import = drm_gem_prime_import,
 224         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 225         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 226         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 227         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 228         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 229         .fops = &fops,
 230         .name = "mali-dp",
 231         .desc = "ARM Mali Display Processor driver",
 232         .date = "20160106",
 233         .major = 1,
 234         .minor = 0,
 235 };
 236
 237 static const struct of_device_id  malidp_drm_of_match[] = {
 238         {
 239                 .compatible = "arm,mali-dp500",
 240                 .data = &malidp_device[MALIDP_500]
 241         },
 242         {
 243                 .compatible = "arm,mali-dp550",
 244                 .data = &malidp_device[MALIDP_550]
 245         },
 246         {
 247                 .compatible = "arm,mali-dp650",
 248                 .data = &malidp_device[MALIDP_650]
 249         },
 250         {},
 251 };
 252 MODULE_DEVICE_TABLE(of, malidp_drm_of_match);
 253
 254 #define MAX_OUTPUT_CHANNELS     3
 255
 256 static int malidp_bind(struct device *dev)
 257 {
 258         struct resource *res;
 259         struct drm_device *drm;
 260         struct device_node *ep;
 261         struct malidp_drm *malidp;
 262         struct malidp_hw_device *hwdev;
 263         struct platform_device *pdev = to_platform_device(dev);
 264         /* number of lines for the R, G and B output */
 265         u8 output_width[MAX_OUTPUT_CHANNELS];
 266         int ret = 0, i;
 267         u32 version, out_depth = 0;
 268
 269         malidp = devm_kzalloc(dev, sizeof(*malidp), GFP_KERNEL);
 270         if (!malidp)
 271                 return -ENOMEM;
 272
 273         hwdev = devm_kzalloc(dev, sizeof(*hwdev), GFP_KERNEL);
 274         if (!hwdev)
 275                 return -ENOMEM;
 276
 277         /*
 278          * copy the associated data from malidp_drm_of_match to avoid
 279          * having to keep a reference to the OF node after binding
 280          */
 281         memcpy(hwdev, of_device_get_match_data(dev), sizeof(*hwdev));
 282         malidp->dev = hwdev;
 283
 284         INIT_LIST_HEAD(&malidp->event_list);
 285
 286         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 287         hwdev->regs = devm_ioremap_resource(dev, res);
 288         if (IS_ERR(hwdev->regs))
 289                 return PTR_ERR(hwdev->regs);
 290
 291         hwdev->pclk = devm_clk_get(dev, "pclk");
 292         if (IS_ERR(hwdev->pclk))
 293                 return PTR_ERR(hwdev->pclk);
 294
 295         hwdev->aclk = devm_clk_get(dev, "aclk");
 296         if (IS_ERR(hwdev->aclk))
 297                 return PTR_ERR(hwdev->aclk);
 298
 299         hwdev->mclk = devm_clk_get(dev, "mclk");
 300         if (IS_ERR(hwdev->mclk))
 301                 return PTR_ERR(hwdev->mclk);
 302
 303         hwdev->pxlclk = devm_clk_get(dev, "pxlclk");
 304         if (IS_ERR(hwdev->pxlclk))
 305                 return PTR_ERR(hwdev->pxlclk);
 306
 307         /* Get the optional framebuffer memory resource */
 308         ret = of_reserved_mem_device_init(dev);
 309         if (ret && ret != -ENODEV)
 310                 return ret;
 311
 312         drm = drm_dev_alloc(&malidp_driver, dev);
 313         if (!drm) {
 314                 ret = -ENOMEM;
 315                 goto alloc_fail;
 316         }
 317
 318         /* Enable APB clock in order to get access to the registers */
 319         clk_prepare_enable(hwdev->pclk);
 320         /*
 321          * Enable AXI clock and main clock so that prefetch can start once
 322          * the registers are set
 323          */
 324         clk_prepare_enable(hwdev->aclk);
 325         clk_prepare_enable(hwdev->mclk);
 326
 327         ret = hwdev->query_hw(hwdev);
 328         if (ret) {
 329                 DRM_ERROR("Invalid HW configuration\n");
 330                 goto query_hw_fail;
 331         }
 332
 333         version = malidp_hw_read(hwdev, hwdev->map.dc_base + MALIDP_DE_CORE_ID);
 334         DRM_INFO("found ARM Mali-DP%3x version r%dp%d\n", version >> 16,
 335                  (version >> 12) & 0xf, (version >> 8) & 0xf);
 336
 337         /* set the number of lines used for output of RGB data */
 338         ret = of_property_read_u8_array(dev->of_node,
 339                                         "arm,malidp-output-port-lines",
 340                                         output_width, MAX_OUTPUT_CHANNELS);
 341         if (ret)
 342                 goto query_hw_fail;
 343
 344         for (i = 0; i < MAX_OUTPUT_CHANNELS; i++)
 345                 out_depth = (out_depth << 8) | (output_width[i] & 0xf);
 346         malidp_hw_write(hwdev, out_depth, hwdev->map.out_depth_base);
 347
 348         drm->dev_private = malidp;
 349         dev_set_drvdata(dev, drm);
 350         atomic_set(&malidp->config_valid, 0);
 351         init_waitqueue_head(&malidp->wq);
 352
 353         ret = malidp_init(drm);
 354         if (ret < 0)
 355                 goto init_fail;
 356
 357         ret = drm_dev_register(drm, 0);
 358         if (ret)
 359                 goto register_fail;
 360
 361         /* Set the CRTC's port so that the encoder component can find it */
 362         ep = of_graph_get_next_endpoint(dev->of_node, NULL);
 363         if (!ep) {
 364                 ret = -EINVAL;
 365                 goto port_fail;
 366         }
 367         malidp->crtc.port = of_get_next_parent(ep);
 368
 369         ret = component_bind_all(dev, drm);
 370         if (ret) {
 371                 DRM_ERROR("Failed to bind all components\n");
 372                 goto bind_fail;
 373         }
 374
 375         ret = malidp_irq_init(pdev);
 376         if (ret < 0)
 377                 goto irq_init_fail;
 378
 379         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 380         if (ret < 0) {
 381                 DRM_ERROR("failed to initialise vblank\n");
 382                 goto vblank_fail;
 383         }
 384
 385         drm_mode_config_reset(drm);
 386
 387         malidp->fbdev = drm_fbdev_cma_init(drm, 32, drm->mode_config.num_crtc,
 388                                            drm->mode_config.num_connector);
 389
 390         if (IS_ERR(malidp->fbdev)) {
 391                 ret = PTR_ERR(malidp->fbdev);
 392                 malidp->fbdev = NULL;
 393                 goto fbdev_fail;
 394         }
 395
 396         drm_kms_helper_poll_init(drm);
 397         return 0;
 398
 399 fbdev_fail:
 400         drm_vblank_cleanup(drm);
 401 vblank_fail:
 402         malidp_se_irq_fini(drm);
 403         malidp_de_irq_fini(drm);
 404 irq_init_fail:
 405         component_unbind_all(dev, drm);
 406 bind_fail:
 407         of_node_put(malidp->crtc.port);
 408         malidp->crtc.port = NULL;
 409 port_fail:
 410         drm_dev_unregister(drm);
 411 register_fail:
 412         malidp_de_planes_destroy(drm);
 413         drm_mode_config_cleanup(drm);
 414 init_fail:
 415         drm->dev_private = NULL;
 416         dev_set_drvdata(dev, NULL);
 417 query_hw_fail:
 418         clk_disable_unprepare(hwdev->mclk);
 419         clk_disable_unprepare(hwdev->aclk);
 420         clk_disable_unprepare(hwdev->pclk);
 421         drm_dev_unref(drm);
 422 alloc_fail:
 423         of_reserved_mem_device_release(dev);
 424
 425         return ret;
 426 }
 427
 428 static void malidp_unbind(struct device *dev)
 429 {
 430         struct drm_device *drm = dev_get_drvdata(dev);
 431         struct malidp_drm *malidp = drm->dev_private;
 432         struct malidp_hw_device *hwdev = malidp->dev;
 433
 434         if (malidp->fbdev) {
 435                 drm_fbdev_cma_fini(malidp->fbdev);
 436                 malidp->fbdev = NULL;
 437         }
 438         drm_kms_helper_poll_fini(drm);
 439         malidp_se_irq_fini(drm);
 440         malidp_de_irq_fini(drm);
 441         drm_vblank_cleanup(drm);
 442         component_unbind_all(dev, drm);
 443         of_node_put(malidp->crtc.port);
 444         malidp->crtc.port = NULL;
 445         drm_dev_unregister(drm);
 446         malidp_de_planes_destroy(drm);
 447         drm_mode_config_cleanup(drm);
 448         drm->dev_private = NULL;
 449         dev_set_drvdata(dev, NULL);
 450         clk_disable_unprepare(hwdev->mclk);
 451         clk_disable_unprepare(hwdev->aclk);
 452         clk_disable_unprepare(hwdev->pclk);
 453         drm_dev_unref(drm);
 454         of_reserved_mem_device_release(dev);
 455 }
 456
 457 static const struct component_master_ops malidp_master_ops = {
 458         .bind = malidp_bind,
 459         .unbind = malidp_unbind,
 460 };
 461
 462 static int malidp_compare_dev(struct device *dev, void *data)
 463 {
 464         struct device_node *np = data;
 465
 466         return dev->of_node == np;
 467 }
 468
 469 static int malidp_platform_probe(struct platform_device *pdev)
 470 {
 471         struct device_node *port, *ep;
 472         struct component_match *match = NULL;
 473
 474         if (!pdev->dev.of_node)
 475                 return -ENODEV;
 476
 477         /* there is only one output port inside each device, find it */
 478         ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
 479         if (!ep)
 480                 return -ENODEV;
 481
 482         if (!of_device_is_available(ep)) {
 483                 of_node_put(ep);
 484                 return -ENODEV;
 485         }
 486
 487         /* add the remote encoder port as component */
 488         port = of_graph_get_remote_port_parent(ep);
 489         of_node_put(ep);
 490         if (!port || !of_device_is_available(port)) {
 491                 of_node_put(port);
 492                 return -EAGAIN;
 493         }
 494
 495         component_match_add(&pdev->dev, &match, malidp_compare_dev, port);
 496         return component_master_add_with_match(&pdev->dev, &malidp_master_ops,
 497                                                match);
 498 }
 499
 500 static int malidp_platform_remove(struct platform_device *pdev)
 501 {
 502         component_master_del(&pdev->dev, &malidp_master_ops);
 503         return 0;
 504 }
 505
 506 static struct platform_driver malidp_platform_driver = {
 507         .probe          = malidp_platform_probe,
 508         .remove         = malidp_platform_remove,
 509         .driver = {
 510                 .name = "mali-dp",
 511                 .of_match_table = malidp_drm_of_match,
 512         },
 513 };
 514
 515 module_platform_driver(malidp_platform_driver);
 516
 517 MODULE_AUTHOR("Liviu Dudau <Liviu.Dudau@arm.com>");
 518 MODULE_DESCRIPTION("ARM Mali DP DRM driver");
 519 MODULE_LICENSE("GPL v2");