sunxi_drm.c revision 1.22
1 /* $NetBSD: sunxi_drm.c,v 1.22 2021/12/19 12:28:20 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 Jared D. McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: sunxi_drm.c,v 1.22 2021/12/19 12:28:20 riastradh Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/conf.h> 35 #include <sys/device.h> 36 #include <sys/intr.h> 37 #include <sys/kernel.h> 38 #include <sys/systm.h> 39 40 #include <uvm/uvm_device.h> 41 #include <uvm/uvm_extern.h> 42 #include <uvm/uvm_object.h> 43 44 #include <dev/fdt/fdt_port.h> 45 #include <dev/fdt/fdtvar.h> 46 47 #include <arm/sunxi/sunxi_drm.h> 48 49 #include <drm/drm_auth.h> 50 #include <drm/drm_crtc_helper.h> 51 #include <drm/drm_drv.h> 52 #include <drm/drm_fb_helper.h> 53 #include <drm/drm_fourcc.h> 54 #include <drm/drm_vblank.h> 55 56 #define SUNXI_DRM_MAX_WIDTH 3840 57 #define SUNXI_DRM_MAX_HEIGHT 2160 58 59 /* 60 * The DRM headers break trunc_page/round_page macros with a redefinition 61 * of PAGE_MASK. Use our own macros instead. 62 */ 63 #define SUNXI_PAGE_MASK (PAGE_SIZE - 1) 64 #define SUNXI_TRUNC_PAGE(x) ((x) & ~SUNXI_PAGE_MASK) 65 #define SUNXI_ROUND_PAGE(x) (((x) + SUNXI_PAGE_MASK) & ~SUNXI_PAGE_MASK) 66 67 static TAILQ_HEAD(, sunxi_drm_endpoint) sunxi_drm_endpoints = 68 TAILQ_HEAD_INITIALIZER(sunxi_drm_endpoints); 69 70 static const struct device_compatible_entry compat_data[] = { 71 { .compat = "allwinner,sun8i-h3-display-engine" }, 72 { .compat = "allwinner,sun50i-a64-display-engine" }, 73 DEVICE_COMPAT_EOL 74 }; 75 76 static const char * fb_compatible[] = { 77 "allwinner,simple-framebuffer", 78 NULL 79 }; 80 81 static int sunxi_drm_match(device_t, cfdata_t, void *); 82 static void sunxi_drm_attach(device_t, device_t, void *); 83 84 static void sunxi_drm_init(device_t); 85 static vmem_t *sunxi_drm_alloc_cma_pool(struct drm_device *, size_t); 86 87 static uint32_t sunxi_drm_get_vblank_counter(struct drm_device *, unsigned int); 88 static int sunxi_drm_enable_vblank(struct drm_device *, unsigned int); 89 static void sunxi_drm_disable_vblank(struct drm_device *, unsigned int); 90 91 static int sunxi_drm_load(struct drm_device *, unsigned long); 92 static void sunxi_drm_unload(struct drm_device *); 93 94 static void sunxi_drm_task_work(struct work *, void *); 95 96 static struct drm_driver sunxi_drm_driver = { 97 .driver_features = DRIVER_MODESET | DRIVER_GEM, 98 .dev_priv_size = 0, 99 .load = sunxi_drm_load, 100 .unload = sunxi_drm_unload, 101 102 .gem_free_object = drm_gem_cma_free_object, 103 .mmap_object = drm_gem_or_legacy_mmap_object, 104 .gem_uvm_ops = &drm_gem_cma_uvm_ops, 105 106 .dumb_create = drm_gem_cma_dumb_create, 107 .dumb_destroy = drm_gem_dumb_destroy, 108 109 .get_vblank_counter = sunxi_drm_get_vblank_counter, 110 .enable_vblank = sunxi_drm_enable_vblank, 111 .disable_vblank = sunxi_drm_disable_vblank, 112 113 .name = DRIVER_NAME, 114 .desc = DRIVER_DESC, 115 .date = DRIVER_DATE, 116 .major = DRIVER_MAJOR, 117 .minor = DRIVER_MINOR, 118 .patchlevel = DRIVER_PATCHLEVEL, 119 }; 120 121 CFATTACH_DECL_NEW(sunxi_drm, sizeof(struct sunxi_drm_softc), 122 sunxi_drm_match, sunxi_drm_attach, NULL, NULL); 123 124 static int 125 sunxi_drm_match(device_t parent, cfdata_t cf, void *aux) 126 { 127 struct fdt_attach_args * const faa = aux; 128 129 return of_compatible_match(faa->faa_phandle, compat_data); 130 } 131 132 static void 133 sunxi_drm_attach(device_t parent, device_t self, void *aux) 134 { 135 struct sunxi_drm_softc * const sc = device_private(self); 136 struct fdt_attach_args * const faa = aux; 137 struct drm_driver * const driver = &sunxi_drm_driver; 138 prop_dictionary_t dict = device_properties(self); 139 bool is_disabled; 140 141 sc->sc_dev = self; 142 sc->sc_dmat = faa->faa_dmat; 143 sc->sc_bst = faa->faa_bst; 144 sc->sc_phandle = faa->faa_phandle; 145 sc->sc_task_thread = NULL; 146 SIMPLEQ_INIT(&sc->sc_tasks); 147 if (workqueue_create(&sc->sc_task_wq, "sunxidrm", 148 &sunxi_drm_task_work, NULL, PRI_NONE, IPL_NONE, WQ_MPSAFE)) { 149 aprint_error_dev(self, "unable to create workqueue\n"); 150 sc->sc_task_wq = NULL; 151 return; 152 } 153 154 aprint_naive("\n"); 155 156 if (prop_dictionary_get_bool(dict, "disabled", &is_disabled) && is_disabled) { 157 aprint_normal(": Display Engine Pipeline (disabled)\n"); 158 return; 159 } 160 161 aprint_normal(": Display Engine Pipeline\n"); 162 163 sc->sc_ddev = drm_dev_alloc(driver, sc->sc_dev); 164 if (IS_ERR(sc->sc_ddev)) { 165 aprint_error_dev(self, "couldn't allocate DRM device\n"); 166 return; 167 } 168 sc->sc_ddev->dev_private = sc; 169 sc->sc_ddev->bst = sc->sc_bst; 170 sc->sc_ddev->bus_dmat = sc->sc_dmat; 171 sc->sc_ddev->dmat = sc->sc_ddev->bus_dmat; 172 sc->sc_ddev->dmat_subregion_p = false; 173 174 fdt_remove_bycompat(fb_compatible); 175 176 config_defer(self, sunxi_drm_init); 177 } 178 179 static void 180 sunxi_drm_init(device_t dev) 181 { 182 struct sunxi_drm_softc * const sc = device_private(dev); 183 struct drm_driver * const driver = &sunxi_drm_driver; 184 int error; 185 186 /* 187 * Cause any tasks issued synchronously during attach to be 188 * processed at the end of this function. 189 */ 190 sc->sc_task_thread = curlwp; 191 192 error = -drm_dev_register(sc->sc_ddev, 0); 193 if (error) { 194 aprint_error_dev(dev, "couldn't register DRM device: %d\n", 195 error); 196 goto out; 197 } 198 sc->sc_dev_registered = true; 199 200 aprint_normal_dev(dev, "initialized %s %d.%d.%d %s on minor %d\n", 201 driver->name, driver->major, driver->minor, driver->patchlevel, 202 driver->date, sc->sc_ddev->primary->index); 203 204 /* 205 * Process asynchronous tasks queued synchronously during 206 * attach. This will be for display detection to attach a 207 * framebuffer, so we have the opportunity for a console device 208 * to attach before autoconf has completed, in time for init(8) 209 * to find that console without panicking. 210 */ 211 while (!SIMPLEQ_EMPTY(&sc->sc_tasks)) { 212 struct sunxi_drm_task *const task = 213 SIMPLEQ_FIRST(&sc->sc_tasks); 214 215 SIMPLEQ_REMOVE_HEAD(&sc->sc_tasks, sdt_u.queue); 216 (*task->sdt_fn)(task); 217 } 218 219 out: /* Cause any subesquent tasks to be processed by the workqueue. */ 220 atomic_store_relaxed(&sc->sc_task_thread, NULL); 221 } 222 223 static vmem_t * 224 sunxi_drm_alloc_cma_pool(struct drm_device *ddev, size_t cma_size) 225 { 226 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 227 bus_dma_segment_t segs[1]; 228 int nsegs; 229 int error; 230 231 error = bus_dmamem_alloc(sc->sc_dmat, cma_size, PAGE_SIZE, 0, 232 segs, 1, &nsegs, BUS_DMA_NOWAIT); 233 if (error) { 234 aprint_error_dev(sc->sc_dev, "couldn't allocate CMA pool\n"); 235 return NULL; 236 } 237 238 return vmem_create("sunxidrm", segs[0].ds_addr, segs[0].ds_len, 239 PAGE_SIZE, NULL, NULL, NULL, 0, VM_SLEEP, IPL_NONE); 240 } 241 242 static int 243 sunxi_drm_fb_create_handle(struct drm_framebuffer *fb, 244 struct drm_file *file, unsigned int *handle) 245 { 246 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(fb); 247 248 return drm_gem_handle_create(file, &sfb->obj->base, handle); 249 } 250 251 static void 252 sunxi_drm_fb_destroy(struct drm_framebuffer *fb) 253 { 254 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(fb); 255 256 drm_framebuffer_cleanup(fb); 257 drm_gem_object_put_unlocked(&sfb->obj->base); 258 kmem_free(sfb, sizeof(*sfb)); 259 } 260 261 static const struct drm_framebuffer_funcs sunxi_drm_framebuffer_funcs = { 262 .create_handle = sunxi_drm_fb_create_handle, 263 .destroy = sunxi_drm_fb_destroy, 264 }; 265 266 static struct drm_framebuffer * 267 sunxi_drm_fb_create(struct drm_device *ddev, struct drm_file *file, 268 const struct drm_mode_fb_cmd2 *cmd) 269 { 270 struct sunxi_drm_framebuffer *fb; 271 struct drm_gem_object *gem_obj; 272 int error; 273 274 if (cmd->flags) 275 return NULL; 276 277 gem_obj = drm_gem_object_lookup(file, cmd->handles[0]); 278 if (gem_obj == NULL) 279 return NULL; 280 281 fb = kmem_zalloc(sizeof(*fb), KM_SLEEP); 282 fb->obj = to_drm_gem_cma_obj(gem_obj); 283 drm_helper_mode_fill_fb_struct(ddev, &fb->base, cmd); 284 285 error = drm_framebuffer_init(ddev, &fb->base, &sunxi_drm_framebuffer_funcs); 286 if (error != 0) 287 goto dealloc; 288 289 return &fb->base; 290 291 dealloc: 292 drm_framebuffer_cleanup(&fb->base); 293 kmem_free(fb, sizeof(*fb)); 294 drm_gem_object_put_unlocked(gem_obj); 295 296 return NULL; 297 } 298 299 static struct drm_mode_config_funcs sunxi_drm_mode_config_funcs = { 300 .fb_create = sunxi_drm_fb_create, 301 }; 302 303 static int 304 sunxi_drm_simplefb_lookup(bus_addr_t *paddr, bus_size_t *psize) 305 { 306 static const struct device_compatible_entry simplefb_compat[] = { 307 { .compat = "simple-framebuffer" }, 308 DEVICE_COMPAT_EOL 309 }; 310 int chosen, child, error; 311 bus_addr_t addr_end; 312 313 chosen = OF_finddevice("/chosen"); 314 if (chosen == -1) 315 return ENOENT; 316 317 for (child = OF_child(chosen); child; child = OF_peer(child)) { 318 if (!fdtbus_status_okay(child)) 319 continue; 320 if (!of_compatible_match(child, simplefb_compat)) 321 continue; 322 error = fdtbus_get_reg(child, 0, paddr, psize); 323 if (error != 0) 324 return error; 325 326 /* Reclaim entire pages used by the simplefb */ 327 addr_end = *paddr + *psize; 328 *paddr = SUNXI_TRUNC_PAGE(*paddr); 329 *psize = SUNXI_ROUND_PAGE(addr_end - *paddr); 330 return 0; 331 } 332 333 return ENOENT; 334 } 335 336 static int 337 sunxi_drm_fb_probe(struct drm_fb_helper *helper, struct drm_fb_helper_surface_size *sizes) 338 { 339 struct sunxi_drm_softc * const sc = sunxi_drm_private(helper->dev); 340 struct drm_device *ddev = helper->dev; 341 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(helper->fb); 342 struct drm_framebuffer *fb = helper->fb; 343 struct sunxi_drmfb_attach_args sfa; 344 bus_addr_t sfb_addr; 345 bus_size_t sfb_size; 346 size_t cma_size; 347 int error; 348 349 const u_int width = sizes->surface_width; 350 const u_int height = sizes->surface_height; 351 const u_int pitch = width * (32 / 8); 352 353 const size_t size = roundup(height * pitch, PAGE_SIZE); 354 355 if (sunxi_drm_simplefb_lookup(&sfb_addr, &sfb_size) != 0) 356 sfb_size = 0; 357 358 /* Reserve enough memory for a 4K plane, rounded to 1MB */ 359 cma_size = (SUNXI_DRM_MAX_WIDTH * SUNXI_DRM_MAX_HEIGHT * 4); 360 if (sfb_size == 0) { 361 /* Add memory for FB console if we cannot reclaim bootloader memory */ 362 cma_size += size; 363 } 364 cma_size = roundup(cma_size, 1024 * 1024); 365 sc->sc_ddev->cma_pool = sunxi_drm_alloc_cma_pool(sc->sc_ddev, cma_size); 366 if (sc->sc_ddev->cma_pool != NULL) { 367 if (sfb_size != 0) { 368 error = vmem_add(sc->sc_ddev->cma_pool, sfb_addr, 369 sfb_size, VM_SLEEP); 370 if (error != 0) 371 sfb_size = 0; 372 } 373 aprint_normal_dev(sc->sc_dev, "reserved %u MB DRAM for CMA", 374 (u_int)((cma_size + sfb_size) / (1024 * 1024))); 375 if (sfb_size != 0) 376 aprint_normal(" (%u MB reclaimed from bootloader)", 377 (u_int)(sfb_size / (1024 * 1024))); 378 aprint_normal("\n"); 379 } 380 381 sfb->obj = drm_gem_cma_create(ddev, size); 382 if (sfb->obj == NULL) { 383 DRM_ERROR("failed to allocate memory for framebuffer\n"); 384 return -ENOMEM; 385 } 386 387 fb->pitches[0] = pitch; 388 fb->offsets[0] = 0; 389 fb->width = width; 390 fb->height = height; 391 fb->format = drm_format_info(DRM_FORMAT_XRGB8888); 392 fb->dev = ddev; 393 394 error = drm_framebuffer_init(ddev, fb, &sunxi_drm_framebuffer_funcs); 395 if (error != 0) { 396 DRM_ERROR("failed to initialize framebuffer\n"); 397 return error; 398 } 399 400 memset(&sfa, 0, sizeof(sfa)); 401 sfa.sfa_drm_dev = ddev; 402 sfa.sfa_fb_helper = helper; 403 sfa.sfa_fb_sizes = *sizes; 404 sfa.sfa_fb_bst = sc->sc_bst; 405 sfa.sfa_fb_dmat = sc->sc_dmat; 406 sfa.sfa_fb_linebytes = helper->fb->pitches[0]; 407 408 helper->fbdev = config_found(ddev->dev, &sfa, NULL, 409 CFARGS(.iattr = "sunxifbbus")); 410 if (helper->fbdev == NULL) { 411 DRM_ERROR("unable to attach framebuffer\n"); 412 return -ENXIO; 413 } 414 415 return 0; 416 } 417 418 static struct drm_fb_helper_funcs sunxi_drm_fb_helper_funcs = { 419 .fb_probe = sunxi_drm_fb_probe, 420 }; 421 422 static int 423 sunxi_drm_load(struct drm_device *ddev, unsigned long flags) 424 { 425 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 426 struct sunxi_drm_endpoint *sep; 427 struct sunxi_drm_fbdev *fbdev; 428 const u_int *data; 429 int datalen, error, num_crtc; 430 431 drm_mode_config_init(ddev); 432 ddev->mode_config.min_width = 0; 433 ddev->mode_config.min_height = 0; 434 ddev->mode_config.max_width = SUNXI_DRM_MAX_WIDTH; 435 ddev->mode_config.max_height = SUNXI_DRM_MAX_HEIGHT; 436 ddev->mode_config.funcs = &sunxi_drm_mode_config_funcs; 437 438 num_crtc = 0; 439 data = fdtbus_get_prop(sc->sc_phandle, "allwinner,pipelines", &datalen); 440 while (datalen >= 4) { 441 const int crtc_phandle = fdtbus_get_phandle_from_native(be32dec(data)); 442 443 TAILQ_FOREACH(sep, &sunxi_drm_endpoints, entries) 444 if (sep->phandle == crtc_phandle && sep->ddev == NULL) { 445 sep->ddev = ddev; 446 error = fdt_endpoint_activate_direct(sep->ep, true); 447 if (error != 0) { 448 aprint_error_dev(sc->sc_dev, "failed to activate endpoint: %d\n", 449 error); 450 } 451 if (fdt_endpoint_type(sep->ep) == EP_DRM_CRTC) 452 num_crtc++; 453 } 454 455 datalen -= 4; 456 data++; 457 } 458 459 if (num_crtc == 0) { 460 aprint_error_dev(sc->sc_dev, "no pipelines configured\n"); 461 error = ENXIO; 462 goto drmerr; 463 } 464 465 fbdev = kmem_zalloc(sizeof(*fbdev), KM_SLEEP); 466 467 drm_fb_helper_prepare(ddev, &fbdev->helper, &sunxi_drm_fb_helper_funcs); 468 469 error = drm_fb_helper_init(ddev, &fbdev->helper, num_crtc); 470 if (error) 471 goto allocerr; 472 473 fbdev->helper.fb = kmem_zalloc(sizeof(struct sunxi_drm_framebuffer), KM_SLEEP); 474 475 drm_fb_helper_single_add_all_connectors(&fbdev->helper); 476 477 drm_helper_disable_unused_functions(ddev); 478 479 drm_fb_helper_initial_config(&fbdev->helper, 32); 480 481 /* XXX */ 482 ddev->irq_enabled = true; 483 drm_vblank_init(ddev, num_crtc); 484 485 return 0; 486 487 allocerr: 488 kmem_free(fbdev, sizeof(*fbdev)); 489 drmerr: 490 drm_mode_config_cleanup(ddev); 491 492 return error; 493 } 494 495 static uint32_t 496 sunxi_drm_get_vblank_counter(struct drm_device *ddev, unsigned int crtc) 497 { 498 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 499 500 if (crtc >= __arraycount(sc->sc_vbl)) 501 return 0; 502 503 if (sc->sc_vbl[crtc].get_vblank_counter == NULL) 504 return 0; 505 506 return sc->sc_vbl[crtc].get_vblank_counter(sc->sc_vbl[crtc].priv); 507 } 508 509 static int 510 sunxi_drm_enable_vblank(struct drm_device *ddev, unsigned int crtc) 511 { 512 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 513 514 if (crtc >= __arraycount(sc->sc_vbl)) 515 return 0; 516 517 if (sc->sc_vbl[crtc].enable_vblank == NULL) 518 return 0; 519 520 sc->sc_vbl[crtc].enable_vblank(sc->sc_vbl[crtc].priv); 521 522 return 0; 523 } 524 525 static void 526 sunxi_drm_disable_vblank(struct drm_device *ddev, unsigned int crtc) 527 { 528 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 529 530 if (crtc >= __arraycount(sc->sc_vbl)) 531 return; 532 533 if (sc->sc_vbl[crtc].disable_vblank == NULL) 534 return; 535 536 sc->sc_vbl[crtc].disable_vblank(sc->sc_vbl[crtc].priv); 537 } 538 539 static void 540 sunxi_drm_unload(struct drm_device *ddev) 541 { 542 drm_mode_config_cleanup(ddev); 543 } 544 545 int 546 sunxi_drm_register_endpoint(int phandle, struct fdt_endpoint *ep) 547 { 548 struct sunxi_drm_endpoint *sep; 549 550 sep = kmem_zalloc(sizeof(*sep), KM_SLEEP); 551 sep->phandle = phandle; 552 sep->ep = ep; 553 sep->ddev = NULL; 554 TAILQ_INSERT_TAIL(&sunxi_drm_endpoints, sep, entries); 555 556 return 0; 557 } 558 559 struct drm_device * 560 sunxi_drm_endpoint_device(struct fdt_endpoint *ep) 561 { 562 struct sunxi_drm_endpoint *sep; 563 564 TAILQ_FOREACH(sep, &sunxi_drm_endpoints, entries) 565 if (sep->ep == ep) 566 return sep->ddev; 567 568 return NULL; 569 } 570 571 static void 572 sunxi_drm_task_work(struct work *work, void *cookie) 573 { 574 struct sunxi_drm_task *task = container_of(work, struct sunxi_drm_task, 575 sdt_u.work); 576 577 (*task->sdt_fn)(task); 578 } 579 580 void 581 sunxi_task_init(struct sunxi_drm_task *task, 582 void (*fn)(struct sunxi_drm_task *)) 583 { 584 585 task->sdt_fn = fn; 586 } 587 588 void 589 sunxi_task_schedule(device_t self, struct sunxi_drm_task *task) 590 { 591 struct sunxi_drm_softc *sc = device_private(self); 592 593 if (atomic_load_relaxed(&sc->sc_task_thread) == curlwp) 594 SIMPLEQ_INSERT_TAIL(&sc->sc_tasks, task, sdt_u.queue); 595 else 596 workqueue_enqueue(sc->sc_task_wq, &task->sdt_u.work, NULL); 597 } 598
Indexes created Thu Sep 25 16:09:42 GMT 2025