drivers/gpu/drm/arm/malidp_drv.c

   1 /*
   2  * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
   3  * Author: Liviu Dudau <[email protected]>
   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         atomic_set(&malidp->config_valid, 0);
  46         hwdev->set_config_valid(hwdev);
  47         /* don't wait for config_valid flag if we are in config mode */
  48         if (hwdev->in_config_mode(hwdev))
  49                 return 0;
  50
  51         ret = wait_event_interruptible_timeout(malidp->wq,
  52                         atomic_read(&malidp->config_valid) == 1,
  53                         msecs_to_jiffies(MALIDP_CONF_VALID_TIMEOUT));
  54
  55         return (ret > 0) ? 0 : -ETIMEDOUT;
  56 }
  57
  58 static void malidp_output_poll_changed(struct drm_device *drm)
  59 {
  60         struct malidp_drm *malidp = drm->dev_private;
  61
  62         drm_fbdev_cma_hotplug_event(malidp->fbdev);
  63 }
  64
  65 static void malidp_atomic_commit_hw_done(struct drm_atomic_state *state)
  66 {
  67         struct drm_pending_vblank_event *event;
  68         struct drm_device *drm = state->dev;
  69         struct malidp_drm *malidp = drm->dev_private;
  70         int ret = malidp_set_and_wait_config_valid(drm);
  71
  72         if (ret)
  73                 DRM_DEBUG_DRIVER("timed out waiting for updated configuration\n");
  74
  75         event = malidp->crtc.state->event;
  76         if (event) {
  77                 malidp->crtc.state->event = NULL;
  78
  79                 spin_lock_irq(&drm->event_lock);
  80                 if (drm_crtc_vblank_get(&malidp->crtc) == 0)
  81                         drm_crtc_arm_vblank_event(&malidp->crtc, event);
  82                 else
  83                         drm_crtc_send_vblank_event(&malidp->crtc, event);
  84                 spin_unlock_irq(&drm->event_lock);
  85         }
  86         drm_atomic_helper_commit_hw_done(state);
  87 }
  88
  89 static void malidp_atomic_commit_tail(struct drm_atomic_state *state)
  90 {
  91         struct drm_device *drm = state->dev;
  92
  93         drm_atomic_helper_commit_modeset_disables(drm, state);
  94         drm_atomic_helper_commit_modeset_enables(drm, state);
  95         drm_atomic_helper_commit_planes(drm, state, 0);
  96
  97         malidp_atomic_commit_hw_done(state);
  98
  99         drm_atomic_helper_wait_for_vblanks(drm, state);
 100
 101         drm_atomic_helper_cleanup_planes(drm, state);
 102 }
 103
 104 static struct drm_mode_config_helper_funcs malidp_mode_config_helpers = {
 105         .atomic_commit_tail = malidp_atomic_commit_tail,
 106 };
 107
 108 static const struct drm_mode_config_funcs malidp_mode_config_funcs = {
 109         .fb_create = drm_fb_cma_create,
 110         .output_poll_changed = malidp_output_poll_changed,
 111         .atomic_check = drm_atomic_helper_check,
 112         .atomic_commit = drm_atomic_helper_commit,
 113 };
 114
 115 static int malidp_enable_vblank(struct drm_device *drm, unsigned int crtc)
 116 {
 117         struct malidp_drm *malidp = drm->dev_private;
 118         struct malidp_hw_device *hwdev = malidp->dev;
 119
 120         malidp_hw_enable_irq(hwdev, MALIDP_DE_BLOCK,
 121                              hwdev->map.de_irq_map.vsync_irq);
 122         return 0;
 123 }
 124
 125 static void malidp_disable_vblank(struct drm_device *drm, unsigned int pipe)
 126 {
 127         struct malidp_drm *malidp = drm->dev_private;
 128         struct malidp_hw_device *hwdev = malidp->dev;
 129
 130         malidp_hw_disable_irq(hwdev, MALIDP_DE_BLOCK,
 131                               hwdev->map.de_irq_map.vsync_irq);
 132 }
 133
 134 static int malidp_init(struct drm_device *drm)
 135 {
 136         int ret;
 137         struct malidp_drm *malidp = drm->dev_private;
 138         struct malidp_hw_device *hwdev = malidp->dev;
 139
 140         drm_mode_config_init(drm);
 141
 142         drm->mode_config.min_width = hwdev->min_line_size;
 143         drm->mode_config.min_height = hwdev->min_line_size;
 144         drm->mode_config.max_width = hwdev->max_line_size;
 145         drm->mode_config.max_height = hwdev->max_line_size;
 146         drm->mode_config.funcs = &malidp_mode_config_funcs;
 147         drm->mode_config.helper_private = &malidp_mode_config_helpers;
 148
 149         ret = malidp_crtc_init(drm);
 150         if (ret) {
 151                 drm_mode_config_cleanup(drm);
 152                 return ret;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static void malidp_fini(struct drm_device *drm)
 159 {
 160         malidp_de_planes_destroy(drm);
 161         drm_mode_config_cleanup(drm);
 162 }
 163
 164 static int malidp_irq_init(struct platform_device *pdev)
 165 {
 166         int irq_de, irq_se, ret = 0;
 167         struct drm_device *drm = dev_get_drvdata(&pdev->dev);
 168
 169         /* fetch the interrupts from DT */
 170         irq_de = platform_get_irq_byname(pdev, "DE");
 171         if (irq_de < 0) {
 172                 DRM_ERROR("no 'DE' IRQ specified!\n");
 173                 return irq_de;
 174         }
 175         irq_se = platform_get_irq_byname(pdev, "SE");
 176         if (irq_se < 0) {
 177                 DRM_ERROR("no 'SE' IRQ specified!\n");
 178                 return irq_se;
 179         }
 180
 181         ret = malidp_de_irq_init(drm, irq_de);
 182         if (ret)
 183                 return ret;
 184
 185         ret = malidp_se_irq_init(drm, irq_se);
 186         if (ret) {
 187                 malidp_de_irq_fini(drm);
 188                 return ret;
 189         }
 190
 191         return 0;
 192 }
 193
 194 static void malidp_lastclose(struct drm_device *drm)
 195 {
 196         struct malidp_drm *malidp = drm->dev_private;
 197
 198         drm_fbdev_cma_restore_mode(malidp->fbdev);
 199 }
 200
 201 static const struct file_operations fops = {
 202         .owner = THIS_MODULE,
 203         .open = drm_open,
 204         .release = drm_release,
 205         .unlocked_ioctl = drm_ioctl,
 206         .compat_ioctl = drm_compat_ioctl,
 207         .poll = drm_poll,
 208         .read = drm_read,
 209         .llseek = noop_llseek,
 210         .mmap = drm_gem_cma_mmap,
 211 };
 212
 213 static struct drm_driver malidp_driver = {
 214         .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
 215                            DRIVER_PRIME,
 216         .lastclose = malidp_lastclose,
 217         .get_vblank_counter = drm_vblank_no_hw_counter,
 218         .enable_vblank = malidp_enable_vblank,
 219         .disable_vblank = malidp_disable_vblank,
 220         .gem_free_object_unlocked = drm_gem_cma_free_object,
 221         .gem_vm_ops = &drm_gem_cma_vm_ops,
 222         .dumb_create = drm_gem_cma_dumb_create,
 223         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 224         .dumb_destroy = drm_gem_dumb_destroy,
 225         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 226         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 227         .gem_prime_export = drm_gem_prime_export,
 228         .gem_prime_import = drm_gem_prime_import,
 229         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 230         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 231         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 232         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 233         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 234         .fops = &fops,
 235         .name = "mali-dp",
 236         .desc = "ARM Mali Display Processor driver",
 237         .date = "20160106",
 238         .major = 1,
 239         .minor = 0,
 240 };
 241
 242 static const struct of_device_id  malidp_drm_of_match[] = {
 243         {
 244                 .compatible = "arm,mali-dp500",
 245                 .data = &malidp_device[MALIDP_500]
 246         },
 247         {
 248                 .compatible = "arm,mali-dp550",
 249                 .data = &malidp_device[MALIDP_550]
 250         },
 251         {
 252                 .compatible = "arm,mali-dp650",
 253                 .data = &malidp_device[MALIDP_650]
 254         },
 255         {},
 256 };
 257 MODULE_DEVICE_TABLE(of, malidp_drm_of_match);
 258
 259 #define MAX_OUTPUT_CHANNELS     3
 260
 261 static int malidp_bind(struct device *dev)
 262 {
 263         struct resource *res;
 264         struct drm_device *drm;
 265         struct device_node *ep;
 266         struct malidp_drm *malidp;
 267         struct malidp_hw_device *hwdev;
 268         struct platform_device *pdev = to_platform_device(dev);
 269         /* number of lines for the R, G and B output */
 270         u8 output_width[MAX_OUTPUT_CHANNELS];
 271         int ret = 0, i;
 272         u32 version, out_depth = 0;
 273
 274         malidp = devm_kzalloc(dev, sizeof(*malidp), GFP_KERNEL);
 275         if (!malidp)
 276                 return -ENOMEM;
 277
 278         hwdev = devm_kzalloc(dev, sizeof(*hwdev), GFP_KERNEL);
 279         if (!hwdev)
 280                 return -ENOMEM;
 281
 282         /*
 283          * copy the associated data from malidp_drm_of_match to avoid
 284          * having to keep a reference to the OF node after binding
 285          */
 286         memcpy(hwdev, of_device_get_match_data(dev), sizeof(*hwdev));
 287         malidp->dev = hwdev;
 288
 289         INIT_LIST_HEAD(&malidp->event_list);
 290
 291         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 292         hwdev->regs = devm_ioremap_resource(dev, res);
 293         if (IS_ERR(hwdev->regs))
 294                 return PTR_ERR(hwdev->regs);
 295
 296         hwdev->pclk = devm_clk_get(dev, "pclk");
 297         if (IS_ERR(hwdev->pclk))
 298                 return PTR_ERR(hwdev->pclk);
 299
 300         hwdev->aclk = devm_clk_get(dev, "aclk");
 301         if (IS_ERR(hwdev->aclk))
 302                 return PTR_ERR(hwdev->aclk);
 303
 304         hwdev->mclk = devm_clk_get(dev, "mclk");
 305         if (IS_ERR(hwdev->mclk))
 306                 return PTR_ERR(hwdev->mclk);
 307
 308         hwdev->pxlclk = devm_clk_get(dev, "pxlclk");
 309         if (IS_ERR(hwdev->pxlclk))
 310                 return PTR_ERR(hwdev->pxlclk);
 311
 312         /* Get the optional framebuffer memory resource */
 313         ret = of_reserved_mem_device_init(dev);
 314         if (ret && ret != -ENODEV)
 315                 return ret;
 316
 317         drm = drm_dev_alloc(&malidp_driver, dev);
 318         if (IS_ERR(drm)) {
 319                 ret = PTR_ERR(drm);
 320                 goto alloc_fail;
 321         }
 322
 323         /* Enable APB clock in order to get access to the registers */
 324         clk_prepare_enable(hwdev->pclk);
 325         /*
 326          * Enable AXI clock and main clock so that prefetch can start once
 327          * the registers are set
 328          */
 329         clk_prepare_enable(hwdev->aclk);
 330         clk_prepare_enable(hwdev->mclk);
 331
 332         ret = hwdev->query_hw(hwdev);
 333         if (ret) {
 334                 DRM_ERROR("Invalid HW configuration\n");
 335                 goto query_hw_fail;
 336         }
 337
 338         version = malidp_hw_read(hwdev, hwdev->map.dc_base + MALIDP_DE_CORE_ID);
 339         DRM_INFO("found ARM Mali-DP%3x version r%dp%d\n", version >> 16,
 340                  (version >> 12) & 0xf, (version >> 8) & 0xf);
 341
 342         /* set the number of lines used for output of RGB data */
 343         ret = of_property_read_u8_array(dev->of_node,
 344                                         "arm,malidp-output-port-lines",
 345                                         output_width, MAX_OUTPUT_CHANNELS);
 346         if (ret)
 347                 goto query_hw_fail;
 348
 349         for (i = 0; i < MAX_OUTPUT_CHANNELS; i++)
 350                 out_depth = (out_depth << 8) | (output_width[i] & 0xf);
 351         malidp_hw_write(hwdev, out_depth, hwdev->map.out_depth_base);
 352
 353         drm->dev_private = malidp;
 354         dev_set_drvdata(dev, drm);
 355         atomic_set(&malidp->config_valid, 0);
 356         init_waitqueue_head(&malidp->wq);
 357
 358         ret = malidp_init(drm);
 359         if (ret < 0)
 360                 goto init_fail;
 361
 362         /* Set the CRTC's port so that the encoder component can find it */
 363         ep = of_graph_get_next_endpoint(dev->of_node, NULL);
 364         if (!ep) {
 365                 ret = -EINVAL;
 366                 goto port_fail;
 367         }
 368         malidp->crtc.port = of_get_next_parent(ep);
 369
 370         ret = component_bind_all(dev, drm);
 371         if (ret) {
 372                 DRM_ERROR("Failed to bind all components\n");
 373                 goto bind_fail;
 374         }
 375
 376         ret = malidp_irq_init(pdev);
 377         if (ret < 0)
 378                 goto irq_init_fail;
 379
 380         drm->irq_enabled = true;
 381
 382         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 383         if (ret < 0) {
 384                 DRM_ERROR("failed to initialise vblank\n");
 385                 goto vblank_fail;
 386         }
 387
 388         drm_mode_config_reset(drm);
 389
 390         malidp->fbdev = drm_fbdev_cma_init(drm, 32, drm->mode_config.num_crtc,
 391                                            drm->mode_config.num_connector);
 392
 393         if (IS_ERR(malidp->fbdev)) {
 394                 ret = PTR_ERR(malidp->fbdev);
 395                 malidp->fbdev = NULL;
 396                 goto fbdev_fail;
 397         }
 398
 399         drm_kms_helper_poll_init(drm);
 400
 401         ret = drm_dev_register(drm, 0);
 402         if (ret)
 403                 goto register_fail;
 404
 405         return 0;
 406
 407 register_fail:
 408         if (malidp->fbdev) {
 409                 drm_fbdev_cma_fini(malidp->fbdev);
 410                 malidp->fbdev = NULL;
 411         }
 412 fbdev_fail:
 413         drm_vblank_cleanup(drm);
 414 vblank_fail:
 415         malidp_se_irq_fini(drm);
 416         malidp_de_irq_fini(drm);
 417         drm->irq_enabled = false;
 418 irq_init_fail:
 419         component_unbind_all(dev, drm);
 420 bind_fail:
 421         of_node_put(malidp->crtc.port);
 422         malidp->crtc.port = NULL;
 423 port_fail:
 424         malidp_fini(drm);
 425 init_fail:
 426         drm->dev_private = NULL;
 427         dev_set_drvdata(dev, NULL);
 428 query_hw_fail:
 429         clk_disable_unprepare(hwdev->mclk);
 430         clk_disable_unprepare(hwdev->aclk);
 431         clk_disable_unprepare(hwdev->pclk);
 432         drm_dev_unref(drm);
 433 alloc_fail:
 434         of_reserved_mem_device_release(dev);
 435
 436         return ret;
 437 }
 438
 439 static void malidp_unbind(struct device *dev)
 440 {
 441         struct drm_device *drm = dev_get_drvdata(dev);
 442         struct malidp_drm *malidp = drm->dev_private;
 443         struct malidp_hw_device *hwdev = malidp->dev;
 444
 445         drm_dev_unregister(drm);
 446         if (malidp->fbdev) {
 447                 drm_fbdev_cma_fini(malidp->fbdev);
 448                 malidp->fbdev = NULL;
 449         }
 450         drm_kms_helper_poll_fini(drm);
 451         malidp_se_irq_fini(drm);
 452         malidp_de_irq_fini(drm);
 453         drm_vblank_cleanup(drm);
 454         component_unbind_all(dev, drm);
 455         of_node_put(malidp->crtc.port);
 456         malidp->crtc.port = NULL;
 457         malidp_fini(drm);
 458         drm->dev_private = NULL;
 459         dev_set_drvdata(dev, NULL);
 460         clk_disable_unprepare(hwdev->mclk);
 461         clk_disable_unprepare(hwdev->aclk);
 462         clk_disable_unprepare(hwdev->pclk);
 463         drm_dev_unref(drm);
 464         of_reserved_mem_device_release(dev);
 465 }
 466
 467 static const struct component_master_ops malidp_master_ops = {
 468         .bind = malidp_bind,
 469         .unbind = malidp_unbind,
 470 };
 471
 472 static int malidp_compare_dev(struct device *dev, void *data)
 473 {
 474         struct device_node *np = data;
 475
 476         return dev->of_node == np;
 477 }
 478
 479 static int malidp_platform_probe(struct platform_device *pdev)
 480 {
 481         struct device_node *port, *ep;
 482         struct component_match *match = NULL;
 483
 484         if (!pdev->dev.of_node)
 485                 return -ENODEV;
 486
 487         /* there is only one output port inside each device, find it */
 488         ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
 489         if (!ep)
 490                 return -ENODEV;
 491
 492         if (!of_device_is_available(ep)) {
 493                 of_node_put(ep);
 494                 return -ENODEV;
 495         }
 496
 497         /* add the remote encoder port as component */
 498         port = of_graph_get_remote_port_parent(ep);
 499         of_node_put(ep);
 500         if (!port || !of_device_is_available(port)) {
 501                 of_node_put(port);
 502                 return -EAGAIN;
 503         }
 504
 505         drm_of_component_match_add(&pdev->dev, &match, malidp_compare_dev,
 506                                    port);
 507         of_node_put(port);
 508         return component_master_add_with_match(&pdev->dev, &malidp_master_ops,
 509                                                match);
 510 }
 511
 512 static int malidp_platform_remove(struct platform_device *pdev)
 513 {
 514         component_master_del(&pdev->dev, &malidp_master_ops);
 515         return 0;
 516 }
 517
 518 static struct platform_driver malidp_platform_driver = {
 519         .probe          = malidp_platform_probe,
 520         .remove         = malidp_platform_remove,
 521         .driver = {
 522                 .name = "mali-dp",
 523                 .of_match_table = malidp_drm_of_match,
 524         },
 525 };
 526
 527 module_platform_driver(malidp_platform_driver);
 528
 529 MODULE_AUTHOR("Liviu Dudau <[email protected]>");
 530 MODULE_DESCRIPTION("ARM Mali DP DRM driver");
 531 MODULE_LICENSE("GPL v2");