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 static int hdlcd_enable_vblank(struct drm_device *drm, unsigned int crtc) 203 { 204 struct hdlcd_drm_private *hdlcd = drm->dev_private; 205 unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK); 206 207 hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask | HDLCD_INTERRUPT_VSYNC); 208 209 return 0; 210 } 211 212 static void hdlcd_disable_vblank(struct drm_device *drm, unsigned int crtc) 213 { 214 struct hdlcd_drm_private *hdlcd = drm->dev_private; 215 unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK); 216 217 hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask & ~HDLCD_INTERRUPT_VSYNC); 218 } 219 220 #ifdef CONFIG_DEBUG_FS 221 static int hdlcd_show_underrun_count(struct seq_file *m, void *arg) 222 { 223 struct drm_info_node *node = (struct drm_info_node *)m->private; 224 struct drm_device *drm = node->minor->dev; 225 struct hdlcd_drm_private *hdlcd = drm->dev_private; 226 227 seq_printf(m, "underrun : %d\n", atomic_read(&hdlcd->buffer_underrun_count)); 228 seq_printf(m, "dma_end : %d\n", atomic_read(&hdlcd->dma_end_count)); 229 seq_printf(m, "bus_error: %d\n", atomic_read(&hdlcd->bus_error_count)); 230 seq_printf(m, "vsync : %d\n", atomic_read(&hdlcd->vsync_count)); 231 return 0; 232 } 233 234 static int hdlcd_show_pxlclock(struct seq_file *m, void *arg) 235 { 236 struct drm_info_node *node = (struct drm_info_node *)m->private; 237 struct drm_device *drm = node->minor->dev; 238 struct hdlcd_drm_private *hdlcd = drm->dev_private; 239 unsigned long clkrate = clk_get_rate(hdlcd->clk); 240 unsigned long mode_clock = hdlcd->crtc.mode.crtc_clock * 1000; 241 242 seq_printf(m, "hw : %lu\n", clkrate); 243 seq_printf(m, "mode: %lu\n", mode_clock); 244 return 0; 245 } 246 247 static struct drm_info_list hdlcd_debugfs_list[] = { 248 { "interrupt_count", hdlcd_show_underrun_count, 0 }, 249 { "clocks", hdlcd_show_pxlclock, 0 }, 250 { "fb", drm_fb_cma_debugfs_show, 0 }, 251 }; 252 253 static int hdlcd_debugfs_init(struct drm_minor *minor) 254 { 255 return drm_debugfs_create_files(hdlcd_debugfs_list, 256 ARRAY_SIZE(hdlcd_debugfs_list), minor->debugfs_root, minor); 257 } 258 259 static void hdlcd_debugfs_cleanup(struct drm_minor *minor) 260 { 261 drm_debugfs_remove_files(hdlcd_debugfs_list, 262 ARRAY_SIZE(hdlcd_debugfs_list), minor); 263 } 264 #endif 265 266 static const struct file_operations fops = { 267 .owner = THIS_MODULE, 268 .open = drm_open, 269 .release = drm_release, 270 .unlocked_ioctl = drm_ioctl, 271 .compat_ioctl = drm_compat_ioctl, 272 .poll = drm_poll, 273 .read = drm_read, 274 .llseek = noop_llseek, 275 .mmap = drm_gem_cma_mmap, 276 }; 277 278 static struct drm_driver hdlcd_driver = { 279 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | 280 DRIVER_MODESET | DRIVER_PRIME | 281 DRIVER_ATOMIC, 282 .lastclose = hdlcd_lastclose, 283 .irq_handler = hdlcd_irq, 284 .irq_preinstall = hdlcd_irq_preinstall, 285 .irq_postinstall = hdlcd_irq_postinstall, 286 .irq_uninstall = hdlcd_irq_uninstall, 287 .get_vblank_counter = drm_vblank_no_hw_counter, 288 .enable_vblank = hdlcd_enable_vblank, 289 .disable_vblank = hdlcd_disable_vblank, 290 .gem_free_object_unlocked = drm_gem_cma_free_object, 291 .gem_vm_ops = &drm_gem_cma_vm_ops, 292 .dumb_create = drm_gem_cma_dumb_create, 293 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 294 .dumb_destroy = drm_gem_dumb_destroy, 295 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 296 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 297 .gem_prime_export = drm_gem_prime_export, 298 .gem_prime_import = drm_gem_prime_import, 299 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 300 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 301 .gem_prime_vmap = drm_gem_cma_prime_vmap, 302 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 303 .gem_prime_mmap = drm_gem_cma_prime_mmap, 304 #ifdef CONFIG_DEBUG_FS 305 .debugfs_init = hdlcd_debugfs_init, 306 .debugfs_cleanup = hdlcd_debugfs_cleanup, 307 #endif 308 .fops = &fops, 309 .name = "hdlcd", 310 .desc = "ARM HDLCD Controller DRM", 311 .date = "20151021", 312 .major = 1, 313 .minor = 0, 314 }; 315 316 static int hdlcd_drm_bind(struct device *dev) 317 { 318 struct drm_device *drm; 319 struct hdlcd_drm_private *hdlcd; 320 int ret; 321 322 hdlcd = devm_kzalloc(dev, sizeof(*hdlcd), GFP_KERNEL); 323 if (!hdlcd) 324 return -ENOMEM; 325 326 drm = drm_dev_alloc(&hdlcd_driver, dev); 327 if (IS_ERR(drm)) 328 return PTR_ERR(drm); 329 330 drm->dev_private = hdlcd; 331 dev_set_drvdata(dev, drm); 332 333 hdlcd_setup_mode_config(drm); 334 ret = hdlcd_load(drm, 0); 335 if (ret) 336 goto err_free; 337 338 ret = component_bind_all(dev, drm); 339 if (ret) { 340 DRM_ERROR("Failed to bind all components\n"); 341 goto err_unload; 342 } 343 344 ret = pm_runtime_set_active(dev); 345 if (ret) 346 goto err_pm_active; 347 348 pm_runtime_enable(dev); 349 350 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 351 if (ret < 0) { 352 DRM_ERROR("failed to initialise vblank\n"); 353 goto err_vblank; 354 } 355 356 drm_mode_config_reset(drm); 357 drm_kms_helper_poll_init(drm); 358 359 hdlcd->fbdev = drm_fbdev_cma_init(drm, 32, drm->mode_config.num_crtc, 360 drm->mode_config.num_connector); 361 362 if (IS_ERR(hdlcd->fbdev)) { 363 ret = PTR_ERR(hdlcd->fbdev); 364 hdlcd->fbdev = NULL; 365 goto err_fbdev; 366 } 367 368 ret = drm_dev_register(drm, 0); 369 if (ret) 370 goto err_register; 371 372 return 0; 373 374 err_register: 375 if (hdlcd->fbdev) { 376 drm_fbdev_cma_fini(hdlcd->fbdev); 377 hdlcd->fbdev = NULL; 378 } 379 err_fbdev: 380 drm_kms_helper_poll_fini(drm); 381 drm_vblank_cleanup(drm); 382 err_vblank: 383 pm_runtime_disable(drm->dev); 384 err_pm_active: 385 component_unbind_all(dev, drm); 386 err_unload: 387 drm_irq_uninstall(drm); 388 of_reserved_mem_device_release(drm->dev); 389 err_free: 390 drm_mode_config_cleanup(drm); 391 dev_set_drvdata(dev, NULL); 392 drm_dev_unref(drm); 393 394 return ret; 395 } 396 397 static void hdlcd_drm_unbind(struct device *dev) 398 { 399 struct drm_device *drm = dev_get_drvdata(dev); 400 struct hdlcd_drm_private *hdlcd = drm->dev_private; 401 402 drm_dev_unregister(drm); 403 if (hdlcd->fbdev) { 404 drm_fbdev_cma_fini(hdlcd->fbdev); 405 hdlcd->fbdev = NULL; 406 } 407 drm_kms_helper_poll_fini(drm); 408 component_unbind_all(dev, drm); 409 drm_vblank_cleanup(drm); 410 pm_runtime_get_sync(drm->dev); 411 drm_irq_uninstall(drm); 412 pm_runtime_put_sync(drm->dev); 413 pm_runtime_disable(drm->dev); 414 of_reserved_mem_device_release(drm->dev); 415 drm_mode_config_cleanup(drm); 416 drm_dev_unref(drm); 417 drm->dev_private = NULL; 418 dev_set_drvdata(dev, NULL); 419 } 420 421 static const struct component_master_ops hdlcd_master_ops = { 422 .bind = hdlcd_drm_bind, 423 .unbind = hdlcd_drm_unbind, 424 }; 425 426 static int compare_dev(struct device *dev, void *data) 427 { 428 return dev->of_node == data; 429 } 430 431 static int hdlcd_probe(struct platform_device *pdev) 432 { 433 struct device_node *port, *ep; 434 struct component_match *match = NULL; 435 436 if (!pdev->dev.of_node) 437 return -ENODEV; 438 439 /* there is only one output port inside each device, find it */ 440 ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL); 441 if (!ep) 442 return -ENODEV; 443 444 if (!of_device_is_available(ep)) { 445 of_node_put(ep); 446 return -ENODEV; 447 } 448 449 /* add the remote encoder port as component */ 450 port = of_graph_get_remote_port_parent(ep); 451 of_node_put(ep); 452 if (!port || !of_device_is_available(port)) { 453 of_node_put(port); 454 return -EAGAIN; 455 } 456 457 drm_of_component_match_add(&pdev->dev, &match, compare_dev, port); 458 of_node_put(port); 459 460 return component_master_add_with_match(&pdev->dev, &hdlcd_master_ops, 461 match); 462 } 463 464 static int hdlcd_remove(struct platform_device *pdev) 465 { 466 component_master_del(&pdev->dev, &hdlcd_master_ops); 467 return 0; 468 } 469 470 static const struct of_device_id hdlcd_of_match[] = { 471 { .compatible = "arm,hdlcd" }, 472 {}, 473 }; 474 MODULE_DEVICE_TABLE(of, hdlcd_of_match); 475 476 static int __maybe_unused hdlcd_pm_suspend(struct device *dev) 477 { 478 struct drm_device *drm = dev_get_drvdata(dev); 479 struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL; 480 481 if (!hdlcd) 482 return 0; 483 484 drm_kms_helper_poll_disable(drm); 485 486 hdlcd->state = drm_atomic_helper_suspend(drm); 487 if (IS_ERR(hdlcd->state)) { 488 drm_kms_helper_poll_enable(drm); 489 return PTR_ERR(hdlcd->state); 490 } 491 492 return 0; 493 } 494 495 static int __maybe_unused hdlcd_pm_resume(struct device *dev) 496 { 497 struct drm_device *drm = dev_get_drvdata(dev); 498 struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL; 499 500 if (!hdlcd) 501 return 0; 502 503 drm_atomic_helper_resume(drm, hdlcd->state); 504 drm_kms_helper_poll_enable(drm); 505 pm_runtime_set_active(dev); 506 507 return 0; 508 } 509 510 static SIMPLE_DEV_PM_OPS(hdlcd_pm_ops, hdlcd_pm_suspend, hdlcd_pm_resume); 511 512 static struct platform_driver hdlcd_platform_driver = { 513 .probe = hdlcd_probe, 514 .remove = hdlcd_remove, 515 .driver = { 516 .name = "hdlcd", 517 .pm = &hdlcd_pm_ops, 518 .of_match_table = hdlcd_of_match, 519 }, 520 }; 521 522 module_platform_driver(hdlcd_platform_driver); 523 524 MODULE_AUTHOR("Liviu Dudau"); 525 MODULE_DESCRIPTION("ARM HDLCD DRM driver"); 526 MODULE_LICENSE("GPL v2"); 527