drivers/gpu/drm/arm/hdlcd_drv.c

   1 /*
   2  * Copyright (C) 2013-2015 ARM Limited
   3  * Author: Liviu Dudau <Liviu.Dudau@arm.com>
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file COPYING in the main directory of this archive
   7  * for more details.
   8  *
   9  *  ARM HDLCD Driver
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/clk.h>
  15 #include <linux/component.h>
  16 #include <linux/list.h>
  17 #include <linux/of_graph.h>
  18 #include <linux/of_reserved_mem.h>
  19 #include <linux/pm_runtime.h>
  20
  21 #include <drm/drmP.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 "hdlcd_drv.h"
  31 #include "hdlcd_regs.h"
  32
  33 static int hdlcd_load(struct drm_device *drm, unsigned long flags)
  34 {
  35         struct hdlcd_drm_private *hdlcd = drm->dev_private;
  36         struct platform_device *pdev = to_platform_device(drm->dev);
  37         struct resource *res;
  38         u32 version;
  39         int ret;
  40
  41         hdlcd->clk = devm_clk_get(drm->dev, "pxlclk");
  42         if (IS_ERR(hdlcd->clk))
  43                 return PTR_ERR(hdlcd->clk);
  44
  45 #ifdef CONFIG_DEBUG_FS
  46         atomic_set(&hdlcd->buffer_underrun_count, 0);
  47         atomic_set(&hdlcd->bus_error_count, 0);
  48         atomic_set(&hdlcd->vsync_count, 0);
  49         atomic_set(&hdlcd->dma_end_count, 0);
  50 #endif
  51
  52         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  53         hdlcd->mmio = devm_ioremap_resource(drm->dev, res);
  54         if (IS_ERR(hdlcd->mmio)) {
  55                 DRM_ERROR("failed to map control registers area\n");
  56                 ret = PTR_ERR(hdlcd->mmio);
  57                 hdlcd->mmio = NULL;
  58                 return ret;
  59         }
  60
  61         version = hdlcd_read(hdlcd, HDLCD_REG_VERSION);
  62         if ((version & HDLCD_PRODUCT_MASK) != HDLCD_PRODUCT_ID) {
  63                 DRM_ERROR("unknown product id: 0x%x\n", version);
  64                 return -EINVAL;
  65         }
  66         DRM_INFO("found ARM HDLCD version r%dp%d\n",
  67                 (version & HDLCD_VERSION_MAJOR_MASK) >> 8,
  68                 version & HDLCD_VERSION_MINOR_MASK);
  69
  70         /* Get the optional framebuffer memory resource */
  71         ret = of_reserved_mem_device_init(drm->dev);
  72         if (ret && ret != -ENODEV)
  73                 return ret;
  74
  75         ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
  76         if (ret)
  77                 goto setup_fail;
  78
  79         ret = hdlcd_setup_crtc(drm);
  80         if (ret < 0) {
  81                 DRM_ERROR("failed to create crtc\n");
  82                 goto setup_fail;
  83         }
  84
  85         ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
  86         if (ret < 0) {
  87                 DRM_ERROR("failed to install IRQ handler\n");
  88                 goto irq_fail;
  89         }
  90
  91         return 0;
  92
  93 irq_fail:
  94         drm_crtc_cleanup(&hdlcd->crtc);
  95 setup_fail:
  96         of_reserved_mem_device_release(drm->dev);
  97
  98         return ret;
  99 }
 100
 101 static void hdlcd_fb_output_poll_changed(struct drm_device *drm)
 102 {
 103         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 104
 105         drm_fbdev_cma_hotplug_event(hdlcd->fbdev);
 106 }
 107
 108 static const struct drm_mode_config_funcs hdlcd_mode_config_funcs = {
 109         .fb_create = drm_fb_cma_create,
 110         .output_poll_changed = hdlcd_fb_output_poll_changed,
 111         .atomic_check = drm_atomic_helper_check,
 112         .atomic_commit = drm_atomic_helper_commit,
 113 };
 114
 115 static void hdlcd_setup_mode_config(struct drm_device *drm)
 116 {
 117         drm_mode_config_init(drm);
 118         drm->mode_config.min_width = 0;
 119         drm->mode_config.min_height = 0;
 120         drm->mode_config.max_width = HDLCD_MAX_XRES;
 121         drm->mode_config.max_height = HDLCD_MAX_YRES;
 122         drm->mode_config.funcs = &hdlcd_mode_config_funcs;
 123 }
 124
 125 static void hdlcd_lastclose(struct drm_device *drm)
 126 {
 127         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 128
 129         drm_fbdev_cma_restore_mode(hdlcd->fbdev);
 130 }
 131
 132 static irqreturn_t hdlcd_irq(int irq, void *arg)
 133 {
 134         struct drm_device *drm = arg;
 135         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 136         unsigned long irq_status;
 137
 138         irq_status = hdlcd_read(hdlcd, HDLCD_REG_INT_STATUS);
 139
 140 #ifdef CONFIG_DEBUG_FS
 141         if (irq_status & HDLCD_INTERRUPT_UNDERRUN)
 142                 atomic_inc(&hdlcd->buffer_underrun_count);
 143
 144         if (irq_status & HDLCD_INTERRUPT_DMA_END)
 145                 atomic_inc(&hdlcd->dma_end_count);
 146
 147         if (irq_status & HDLCD_INTERRUPT_BUS_ERROR)
 148                 atomic_inc(&hdlcd->bus_error_count);
 149
 150         if (irq_status & HDLCD_INTERRUPT_VSYNC)
 151                 atomic_inc(&hdlcd->vsync_count);
 152
 153 #endif
 154         if (irq_status & HDLCD_INTERRUPT_VSYNC)
 155                 drm_crtc_handle_vblank(&hdlcd->crtc);
 156
 157         /* acknowledge interrupt(s) */
 158         hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, irq_status);
 159
 160         return IRQ_HANDLED;
 161 }
 162
 163 static void hdlcd_irq_preinstall(struct drm_device *drm)
 164 {
 165         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 166         /* Ensure interrupts are disabled */
 167         hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0);
 168         hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, ~0);
 169 }
 170
 171 static int hdlcd_irq_postinstall(struct drm_device *drm)
 172 {
 173 #ifdef CONFIG_DEBUG_FS
 174         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 175         unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
 176
 177         /* enable debug interrupts */
 178         irq_mask |= HDLCD_DEBUG_INT_MASK;
 179
 180         hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
 181 #endif
 182         return 0;
 183 }
 184
 185 static void hdlcd_irq_uninstall(struct drm_device *drm)
 186 {
 187         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 188         /* disable all the interrupts that we might have enabled */
 189         unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
 190
 191 #ifdef CONFIG_DEBUG_FS
 192         /* disable debug interrupts */
 193         irq_mask &= ~HDLCD_DEBUG_INT_MASK;
 194 #endif
 195
 196         /* disable vsync interrupts */
 197         irq_mask &= ~HDLCD_INTERRUPT_VSYNC;
 198
 199         hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
 200 }
 201
 202 #ifdef CONFIG_DEBUG_FS
 203 static int hdlcd_show_underrun_count(struct seq_file *m, void *arg)
 204 {
 205         struct drm_info_node *node = (struct drm_info_node *)m->private;
 206         struct drm_device *drm = node->minor->dev;
 207         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 208
 209         seq_printf(m, "underrun : %d\n", atomic_read(&hdlcd->buffer_underrun_count));
 210         seq_printf(m, "dma_end  : %d\n", atomic_read(&hdlcd->dma_end_count));
 211         seq_printf(m, "bus_error: %d\n", atomic_read(&hdlcd->bus_error_count));
 212         seq_printf(m, "vsync    : %d\n", atomic_read(&hdlcd->vsync_count));
 213         return 0;
 214 }
 215
 216 static int hdlcd_show_pxlclock(struct seq_file *m, void *arg)
 217 {
 218         struct drm_info_node *node = (struct drm_info_node *)m->private;
 219         struct drm_device *drm = node->minor->dev;
 220         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 221         unsigned long clkrate = clk_get_rate(hdlcd->clk);
 222         unsigned long mode_clock = hdlcd->crtc.mode.crtc_clock * 1000;
 223
 224         seq_printf(m, "hw  : %lu\n", clkrate);
 225         seq_printf(m, "mode: %lu\n", mode_clock);
 226         return 0;
 227 }
 228
 229 static struct drm_info_list hdlcd_debugfs_list[] = {
 230         { "interrupt_count", hdlcd_show_underrun_count, 0 },
 231         { "clocks", hdlcd_show_pxlclock, 0 },
 232         { "fb", drm_fb_cma_debugfs_show, 0 },
 233 };
 234
 235 static int hdlcd_debugfs_init(struct drm_minor *minor)
 236 {
 237         return drm_debugfs_create_files(hdlcd_debugfs_list,
 238                 ARRAY_SIZE(hdlcd_debugfs_list), minor->debugfs_root, minor);
 239 }
 240 #endif
 241
 242 DEFINE_DRM_GEM_CMA_FOPS(fops);
 243
 244 static struct drm_driver hdlcd_driver = {
 245         .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM |
 246                            DRIVER_MODESET | DRIVER_PRIME |
 247                            DRIVER_ATOMIC,
 248         .lastclose = hdlcd_lastclose,
 249         .irq_handler = hdlcd_irq,
 250         .irq_preinstall = hdlcd_irq_preinstall,
 251         .irq_postinstall = hdlcd_irq_postinstall,
 252         .irq_uninstall = hdlcd_irq_uninstall,
 253         .gem_free_object_unlocked = drm_gem_cma_free_object,
 254         .gem_vm_ops = &drm_gem_cma_vm_ops,
 255         .dumb_create = drm_gem_cma_dumb_create,
 256         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 257         .dumb_destroy = drm_gem_dumb_destroy,
 258         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 259         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 260         .gem_prime_export = drm_gem_prime_export,
 261         .gem_prime_import = drm_gem_prime_import,
 262         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 263         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 264         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 265         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 266         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 267 #ifdef CONFIG_DEBUG_FS
 268         .debugfs_init = hdlcd_debugfs_init,
 269 #endif
 270         .fops = &fops,
 271         .name = "hdlcd",
 272         .desc = "ARM HDLCD Controller DRM",
 273         .date = "20151021",
 274         .major = 1,
 275         .minor = 0,
 276 };
 277
 278 static int hdlcd_drm_bind(struct device *dev)
 279 {
 280         struct drm_device *drm;
 281         struct hdlcd_drm_private *hdlcd;
 282         int ret;
 283
 284         hdlcd = devm_kzalloc(dev, sizeof(*hdlcd), GFP_KERNEL);
 285         if (!hdlcd)
 286                 return -ENOMEM;
 287
 288         drm = drm_dev_alloc(&hdlcd_driver, dev);
 289         if (IS_ERR(drm))
 290                 return PTR_ERR(drm);
 291
 292         drm->dev_private = hdlcd;
 293         dev_set_drvdata(dev, drm);
 294
 295         hdlcd_setup_mode_config(drm);
 296         ret = hdlcd_load(drm, 0);
 297         if (ret)
 298                 goto err_free;
 299
 300         /* Set the CRTC's port so that the encoder component can find it */
 301         hdlcd->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
 302
 303         ret = component_bind_all(dev, drm);
 304         if (ret) {
 305                 DRM_ERROR("Failed to bind all components\n");
 306                 goto err_unload;
 307         }
 308
 309         ret = pm_runtime_set_active(dev);
 310         if (ret)
 311                 goto err_pm_active;
 312
 313         pm_runtime_enable(dev);
 314
 315         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 316         if (ret < 0) {
 317                 DRM_ERROR("failed to initialise vblank\n");
 318                 goto err_vblank;
 319         }
 320
 321         drm_mode_config_reset(drm);
 322         drm_kms_helper_poll_init(drm);
 323
 324         hdlcd->fbdev = drm_fbdev_cma_init(drm, 32,
 325                                           drm->mode_config.num_connector);
 326
 327         if (IS_ERR(hdlcd->fbdev)) {
 328                 ret = PTR_ERR(hdlcd->fbdev);
 329                 hdlcd->fbdev = NULL;
 330                 goto err_fbdev;
 331         }
 332
 333         ret = drm_dev_register(drm, 0);
 334         if (ret)
 335                 goto err_register;
 336
 337         return 0;
 338
 339 err_register:
 340         if (hdlcd->fbdev) {
 341                 drm_fbdev_cma_fini(hdlcd->fbdev);
 342                 hdlcd->fbdev = NULL;
 343         }
 344 err_fbdev:
 345         drm_kms_helper_poll_fini(drm);
 346         drm_vblank_cleanup(drm);
 347 err_vblank:
 348         pm_runtime_disable(drm->dev);
 349 err_pm_active:
 350         component_unbind_all(dev, drm);
 351 err_unload:
 352         of_node_put(hdlcd->crtc.port);
 353         hdlcd->crtc.port = NULL;
 354         drm_irq_uninstall(drm);
 355         of_reserved_mem_device_release(drm->dev);
 356 err_free:
 357         drm_mode_config_cleanup(drm);
 358         dev_set_drvdata(dev, NULL);
 359         drm_dev_unref(drm);
 360
 361         return ret;
 362 }
 363
 364 static void hdlcd_drm_unbind(struct device *dev)
 365 {
 366         struct drm_device *drm = dev_get_drvdata(dev);
 367         struct hdlcd_drm_private *hdlcd = drm->dev_private;
 368
 369         drm_dev_unregister(drm);
 370         if (hdlcd->fbdev) {
 371                 drm_fbdev_cma_fini(hdlcd->fbdev);
 372                 hdlcd->fbdev = NULL;
 373         }
 374         drm_kms_helper_poll_fini(drm);
 375         component_unbind_all(dev, drm);
 376         of_node_put(hdlcd->crtc.port);
 377         hdlcd->crtc.port = NULL;
 378         drm_vblank_cleanup(drm);
 379         pm_runtime_get_sync(drm->dev);
 380         drm_irq_uninstall(drm);
 381         pm_runtime_put_sync(drm->dev);
 382         pm_runtime_disable(drm->dev);
 383         of_reserved_mem_device_release(drm->dev);
 384         drm_mode_config_cleanup(drm);
 385         drm_dev_unref(drm);
 386         drm->dev_private = NULL;
 387         dev_set_drvdata(dev, NULL);
 388 }
 389
 390 static const struct component_master_ops hdlcd_master_ops = {
 391         .bind           = hdlcd_drm_bind,
 392         .unbind         = hdlcd_drm_unbind,
 393 };
 394
 395 static int compare_dev(struct device *dev, void *data)
 396 {
 397         return dev->of_node == data;
 398 }
 399
 400 static int hdlcd_probe(struct platform_device *pdev)
 401 {
 402         struct device_node *port;
 403         struct component_match *match = NULL;
 404
 405         /* there is only one output port inside each device, find it */
 406         port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
 407         if (!port)
 408                 return -ENODEV;
 409
 410         drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
 411         of_node_put(port);
 412
 413         return component_master_add_with_match(&pdev->dev, &hdlcd_master_ops,
 414                                                match);
 415 }
 416
 417 static int hdlcd_remove(struct platform_device *pdev)
 418 {
 419         component_master_del(&pdev->dev, &hdlcd_master_ops);
 420         return 0;
 421 }
 422
 423 static const struct of_device_id  hdlcd_of_match[] = {
 424         { .compatible   = "arm,hdlcd" },
 425         {},
 426 };
 427 MODULE_DEVICE_TABLE(of, hdlcd_of_match);
 428
 429 static int __maybe_unused hdlcd_pm_suspend(struct device *dev)
 430 {
 431         struct drm_device *drm = dev_get_drvdata(dev);
 432         struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL;
 433
 434         if (!hdlcd)
 435                 return 0;
 436
 437         drm_kms_helper_poll_disable(drm);
 438
 439         hdlcd->state = drm_atomic_helper_suspend(drm);
 440         if (IS_ERR(hdlcd->state)) {
 441                 drm_kms_helper_poll_enable(drm);
 442                 return PTR_ERR(hdlcd->state);
 443         }
 444
 445         return 0;
 446 }
 447
 448 static int __maybe_unused hdlcd_pm_resume(struct device *dev)
 449 {
 450         struct drm_device *drm = dev_get_drvdata(dev);
 451         struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL;
 452
 453         if (!hdlcd)
 454                 return 0;
 455
 456         drm_atomic_helper_resume(drm, hdlcd->state);
 457         drm_kms_helper_poll_enable(drm);
 458         pm_runtime_set_active(dev);
 459
 460         return 0;
 461 }
 462
 463 static SIMPLE_DEV_PM_OPS(hdlcd_pm_ops, hdlcd_pm_suspend, hdlcd_pm_resume);
 464
 465 static struct platform_driver hdlcd_platform_driver = {
 466         .probe          = hdlcd_probe,
 467         .remove         = hdlcd_remove,
 468         .driver = {
 469                 .name = "hdlcd",
 470                 .pm = &hdlcd_pm_ops,
 471                 .of_match_table = hdlcd_of_match,
 472         },
 473 };
 474
 475 module_platform_driver(hdlcd_platform_driver);
 476
 477 MODULE_AUTHOR("Liviu Dudau");
 478 MODULE_DESCRIPTION("ARM HDLCD DRM driver");
 479 MODULE_LICENSE("GPL v2");