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"); 520