sunxi_drm.c revision 1.23
1 /* $NetBSD: sunxi_drm.c,v 1.23 2021/12/19 12:28:44 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 1.23 2021/12/19 12:28:44 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 aprint_naive("\n"); 142 143 if (prop_dictionary_get_bool(dict, "disabled", &is_disabled) && 144 is_disabled) { 145 aprint_normal(": Display Engine Pipeline (disabled)\n"); 146 return; 147 } 148 149 aprint_normal(": Display Engine Pipeline\n"); 150 151 sc->sc_dev = self; 152 sc->sc_dmat = faa->faa_dmat; 153 sc->sc_bst = faa->faa_bst; 154 sc->sc_phandle = faa->faa_phandle; 155 sc->sc_task_thread = NULL; 156 SIMPLEQ_INIT(&sc->sc_tasks); 157 if (workqueue_create(&sc->sc_task_wq, "sunxidrm", 158 &sunxi_drm_task_work, NULL, PRI_NONE, IPL_NONE, WQ_MPSAFE)) { 159 aprint_error_dev(self, "unable to create workqueue\n"); 160 sc->sc_task_wq = NULL; 161 return; 162 } 163 164 sc->sc_ddev = drm_dev_alloc(driver, sc->sc_dev); 165 if (IS_ERR(sc->sc_ddev)) { 166 aprint_error_dev(self, "couldn't allocate DRM device\n"); 167 return; 168 } 169 sc->sc_ddev->dev_private = sc; 170 sc->sc_ddev->bst = sc->sc_bst; 171 sc->sc_ddev->bus_dmat = sc->sc_dmat; 172 sc->sc_ddev->dmat = sc->sc_ddev->bus_dmat; 173 sc->sc_ddev->dmat_subregion_p = false; 174 175 fdt_remove_bycompat(fb_compatible); 176 177 config_defer(self, sunxi_drm_init); 178 } 179 180 static void 181 sunxi_drm_init(device_t dev) 182 { 183 struct sunxi_drm_softc * const sc = device_private(dev); 184 struct drm_driver * const driver = &sunxi_drm_driver; 185 int error; 186 187 /* 188 * Cause any tasks issued synchronously during attach to be 189 * processed at the end of this function. 190 */ 191 sc->sc_task_thread = curlwp; 192 193 error = -drm_dev_register(sc->sc_ddev, 0); 194 if (error) { 195 aprint_error_dev(dev, "couldn't register DRM device: %d\n", 196 error); 197 goto out; 198 } 199 sc->sc_dev_registered = true; 200 201 aprint_normal_dev(dev, "initialized %s %d.%d.%d %s on minor %d\n", 202 driver->name, driver->major, driver->minor, driver->patchlevel, 203 driver->date, sc->sc_ddev->primary->index); 204 205 /* 206 * Process asynchronous tasks queued synchronously during 207 * attach. This will be for display detection to attach a 208 * framebuffer, so we have the opportunity for a console device 209 * to attach before autoconf has completed, in time for init(8) 210 * to find that console without panicking. 211 */ 212 while (!SIMPLEQ_EMPTY(&sc->sc_tasks)) { 213 struct sunxi_drm_task *const task = 214 SIMPLEQ_FIRST(&sc->sc_tasks); 215 216 SIMPLEQ_REMOVE_HEAD(&sc->sc_tasks, sdt_u.queue); 217 (*task->sdt_fn)(task); 218 } 219 220 out: /* Cause any subesquent tasks to be processed by the workqueue. */ 221 atomic_store_relaxed(&sc->sc_task_thread, NULL); 222 } 223 224 static vmem_t * 225 sunxi_drm_alloc_cma_pool(struct drm_device *ddev, size_t cma_size) 226 { 227 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 228 bus_dma_segment_t segs[1]; 229 int nsegs; 230 int error; 231 232 error = bus_dmamem_alloc(sc->sc_dmat, cma_size, PAGE_SIZE, 0, 233 segs, 1, &nsegs, BUS_DMA_NOWAIT); 234 if (error) { 235 aprint_error_dev(sc->sc_dev, "couldn't allocate CMA pool\n"); 236 return NULL; 237 } 238 239 return vmem_create("sunxidrm", segs[0].ds_addr, segs[0].ds_len, 240 PAGE_SIZE, NULL, NULL, NULL, 0, VM_SLEEP, IPL_NONE); 241 } 242 243 static int 244 sunxi_drm_fb_create_handle(struct drm_framebuffer *fb, 245 struct drm_file *file, unsigned int *handle) 246 { 247 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(fb); 248 249 return drm_gem_handle_create(file, &sfb->obj->base, handle); 250 } 251 252 static void 253 sunxi_drm_fb_destroy(struct drm_framebuffer *fb) 254 { 255 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(fb); 256 257 drm_framebuffer_cleanup(fb); 258 drm_gem_object_put_unlocked(&sfb->obj->base); 259 kmem_free(sfb, sizeof(*sfb)); 260 } 261 262 static const struct drm_framebuffer_funcs sunxi_drm_framebuffer_funcs = { 263 .create_handle = sunxi_drm_fb_create_handle, 264 .destroy = sunxi_drm_fb_destroy, 265 }; 266 267 static struct drm_framebuffer * 268 sunxi_drm_fb_create(struct drm_device *ddev, struct drm_file *file, 269 const struct drm_mode_fb_cmd2 *cmd) 270 { 271 struct sunxi_drm_framebuffer *fb; 272 struct drm_gem_object *gem_obj; 273 int error; 274 275 if (cmd->flags) 276 return NULL; 277 278 gem_obj = drm_gem_object_lookup(file, cmd->handles[0]); 279 if (gem_obj == NULL) 280 return NULL; 281 282 fb = kmem_zalloc(sizeof(*fb), KM_SLEEP); 283 fb->obj = to_drm_gem_cma_obj(gem_obj); 284 drm_helper_mode_fill_fb_struct(ddev, &fb->base, cmd); 285 286 error = drm_framebuffer_init(ddev, &fb->base, &sunxi_drm_framebuffer_funcs); 287 if (error != 0) 288 goto dealloc; 289 290 return &fb->base; 291 292 dealloc: 293 drm_framebuffer_cleanup(&fb->base); 294 kmem_free(fb, sizeof(*fb)); 295 drm_gem_object_put_unlocked(gem_obj); 296 297 return NULL; 298 } 299 300 static struct drm_mode_config_funcs sunxi_drm_mode_config_funcs = { 301 .fb_create = sunxi_drm_fb_create, 302 }; 303 304 static int 305 sunxi_drm_simplefb_lookup(bus_addr_t *paddr, bus_size_t *psize) 306 { 307 static const struct device_compatible_entry simplefb_compat[] = { 308 { .compat = "simple-framebuffer" }, 309 DEVICE_COMPAT_EOL 310 }; 311 int chosen, child, error; 312 bus_addr_t addr_end; 313 314 chosen = OF_finddevice("/chosen"); 315 if (chosen == -1) 316 return ENOENT; 317 318 for (child = OF_child(chosen); child; child = OF_peer(child)) { 319 if (!fdtbus_status_okay(child)) 320 continue; 321 if (!of_compatible_match(child, simplefb_compat)) 322 continue; 323 error = fdtbus_get_reg(child, 0, paddr, psize); 324 if (error != 0) 325 return error; 326 327 /* Reclaim entire pages used by the simplefb */ 328 addr_end = *paddr + *psize; 329 *paddr = SUNXI_TRUNC_PAGE(*paddr); 330 *psize = SUNXI_ROUND_PAGE(addr_end - *paddr); 331 return 0; 332 } 333 334 return ENOENT; 335 } 336 337 static int 338 sunxi_drm_fb_probe(struct drm_fb_helper *helper, struct drm_fb_helper_surface_size *sizes) 339 { 340 struct sunxi_drm_softc * const sc = sunxi_drm_private(helper->dev); 341 struct drm_device *ddev = helper->dev; 342 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(helper->fb); 343 struct drm_framebuffer *fb = helper->fb; 344 struct sunxi_drmfb_attach_args sfa; 345 bus_addr_t sfb_addr; 346 bus_size_t sfb_size; 347 size_t cma_size; 348 int error; 349 350 const u_int width = sizes->surface_width; 351 const u_int height = sizes->surface_height; 352 const u_int pitch = width * (32 / 8); 353 354 const size_t size = roundup(height * pitch, PAGE_SIZE); 355 356 if (sunxi_drm_simplefb_lookup(&sfb_addr, &sfb_size) != 0) 357 sfb_size = 0; 358 359 /* Reserve enough memory for a 4K plane, rounded to 1MB */ 360 cma_size = (SUNXI_DRM_MAX_WIDTH * SUNXI_DRM_MAX_HEIGHT * 4); 361 if (sfb_size == 0) { 362 /* Add memory for FB console if we cannot reclaim bootloader memory */ 363 cma_size += size; 364 } 365 cma_size = roundup(cma_size, 1024 * 1024); 366 sc->sc_ddev->cma_pool = sunxi_drm_alloc_cma_pool(sc->sc_ddev, cma_size); 367 if (sc->sc_ddev->cma_pool != NULL) { 368 if (sfb_size != 0) { 369 error = vmem_add(sc->sc_ddev->cma_pool, sfb_addr, 370 sfb_size, VM_SLEEP); 371 if (error != 0) 372 sfb_size = 0; 373 } 374 aprint_normal_dev(sc->sc_dev, "reserved %u MB DRAM for CMA", 375 (u_int)((cma_size + sfb_size) / (1024 * 1024))); 376 if (sfb_size != 0) 377 aprint_normal(" (%u MB reclaimed from bootloader)", 378 (u_int)(sfb_size / (1024 * 1024))); 379 aprint_normal("\n"); 380 } 381 382 sfb->obj = drm_gem_cma_create(ddev, size); 383 if (sfb->obj == NULL) { 384 DRM_ERROR("failed to allocate memory for framebuffer\n"); 385 return -ENOMEM; 386 } 387 388 fb->pitches[0] = pitch; 389 fb->offsets[0] = 0; 390 fb->width = width; 391 fb->height = height; 392 fb->format = drm_format_info(DRM_FORMAT_XRGB8888); 393 fb->dev = ddev; 394 395 error = drm_framebuffer_init(ddev, fb, &sunxi_drm_framebuffer_funcs); 396 if (error != 0) { 397 DRM_ERROR("failed to initialize framebuffer\n"); 398 return error; 399 } 400 401 memset(&sfa, 0, sizeof(sfa)); 402 sfa.sfa_drm_dev = ddev; 403 sfa.sfa_fb_helper = helper; 404 sfa.sfa_fb_sizes = *sizes; 405 sfa.sfa_fb_bst = sc->sc_bst; 406 sfa.sfa_fb_dmat = sc->sc_dmat; 407 sfa.sfa_fb_linebytes = helper->fb->pitches[0]; 408 409 helper->fbdev = config_found(ddev->dev, &sfa, NULL, 410 CFARGS(.iattr = "sunxifbbus")); 411 if (helper->fbdev == NULL) { 412 DRM_ERROR("unable to attach framebuffer\n"); 413 return -ENXIO; 414 } 415 416 return 0; 417 } 418 419 static struct drm_fb_helper_funcs sunxi_drm_fb_helper_funcs = { 420 .fb_probe = sunxi_drm_fb_probe, 421 }; 422 423 static int 424 sunxi_drm_load(struct drm_device *ddev, unsigned long flags) 425 { 426 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 427 struct sunxi_drm_endpoint *sep; 428 struct sunxi_drm_fbdev *fbdev; 429 const u_int *data; 430 int datalen, error, num_crtc; 431 432 drm_mode_config_init(ddev); 433 ddev->mode_config.min_width = 0; 434 ddev->mode_config.min_height = 0; 435 ddev->mode_config.max_width = SUNXI_DRM_MAX_WIDTH; 436 ddev->mode_config.max_height = SUNXI_DRM_MAX_HEIGHT; 437 ddev->mode_config.funcs = &sunxi_drm_mode_config_funcs; 438 439 num_crtc = 0; 440 data = fdtbus_get_prop(sc->sc_phandle, "allwinner,pipelines", &datalen); 441 while (datalen >= 4) { 442 const int crtc_phandle = fdtbus_get_phandle_from_native(be32dec(data)); 443 444 TAILQ_FOREACH(sep, &sunxi_drm_endpoints, entries) 445 if (sep->phandle == crtc_phandle && sep->ddev == NULL) { 446 sep->ddev = ddev; 447 error = fdt_endpoint_activate_direct(sep->ep, true); 448 if (error != 0) { 449 aprint_error_dev(sc->sc_dev, "failed to activate endpoint: %d\n", 450 error); 451 } 452 if (fdt_endpoint_type(sep->ep) == EP_DRM_CRTC) 453 num_crtc++; 454 } 455 456 datalen -= 4; 457 data++; 458 } 459 460 if (num_crtc == 0) { 461 aprint_error_dev(sc->sc_dev, "no pipelines configured\n"); 462 error = ENXIO; 463 goto drmerr; 464 } 465 466 fbdev = kmem_zalloc(sizeof(*fbdev), KM_SLEEP); 467 468 drm_fb_helper_prepare(ddev, &fbdev->helper, &sunxi_drm_fb_helper_funcs); 469 470 error = drm_fb_helper_init(ddev, &fbdev->helper, num_crtc); 471 if (error) 472 goto allocerr; 473 474 fbdev->helper.fb = kmem_zalloc(sizeof(struct sunxi_drm_framebuffer), KM_SLEEP); 475 476 drm_fb_helper_single_add_all_connectors(&fbdev->helper); 477 478 drm_helper_disable_unused_functions(ddev); 479 480 drm_fb_helper_initial_config(&fbdev->helper, 32); 481 482 /* XXX */ 483 ddev->irq_enabled = true; 484 drm_vblank_init(ddev, num_crtc); 485 486 return 0; 487 488 allocerr: 489 kmem_free(fbdev, sizeof(*fbdev)); 490 drmerr: 491 drm_mode_config_cleanup(ddev); 492 493 return error; 494 } 495 496 static uint32_t 497 sunxi_drm_get_vblank_counter(struct drm_device *ddev, unsigned int crtc) 498 { 499 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 500 501 if (crtc >= __arraycount(sc->sc_vbl)) 502 return 0; 503 504 if (sc->sc_vbl[crtc].get_vblank_counter == NULL) 505 return 0; 506 507 return sc->sc_vbl[crtc].get_vblank_counter(sc->sc_vbl[crtc].priv); 508 } 509 510 static int 511 sunxi_drm_enable_vblank(struct drm_device *ddev, unsigned int crtc) 512 { 513 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 514 515 if (crtc >= __arraycount(sc->sc_vbl)) 516 return 0; 517 518 if (sc->sc_vbl[crtc].enable_vblank == NULL) 519 return 0; 520 521 sc->sc_vbl[crtc].enable_vblank(sc->sc_vbl[crtc].priv); 522 523 return 0; 524 } 525 526 static void 527 sunxi_drm_disable_vblank(struct drm_device *ddev, unsigned int crtc) 528 { 529 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 530 531 if (crtc >= __arraycount(sc->sc_vbl)) 532 return; 533 534 if (sc->sc_vbl[crtc].disable_vblank == NULL) 535 return; 536 537 sc->sc_vbl[crtc].disable_vblank(sc->sc_vbl[crtc].priv); 538 } 539 540 static void 541 sunxi_drm_unload(struct drm_device *ddev) 542 { 543 drm_mode_config_cleanup(ddev); 544 } 545 546 int 547 sunxi_drm_register_endpoint(int phandle, struct fdt_endpoint *ep) 548 { 549 struct sunxi_drm_endpoint *sep; 550 551 sep = kmem_zalloc(sizeof(*sep), KM_SLEEP); 552 sep->phandle = phandle; 553 sep->ep = ep; 554 sep->ddev = NULL; 555 TAILQ_INSERT_TAIL(&sunxi_drm_endpoints, sep, entries); 556 557 return 0; 558 } 559 560 struct drm_device * 561 sunxi_drm_endpoint_device(struct fdt_endpoint *ep) 562 { 563 struct sunxi_drm_endpoint *sep; 564 565 TAILQ_FOREACH(sep, &sunxi_drm_endpoints, entries) 566 if (sep->ep == ep) 567 return sep->ddev; 568 569 return NULL; 570 } 571 572 static void 573 sunxi_drm_task_work(struct work *work, void *cookie) 574 { 575 struct sunxi_drm_task *task = container_of(work, struct sunxi_drm_task, 576 sdt_u.work); 577 578 (*task->sdt_fn)(task); 579 } 580 581 void 582 sunxi_task_init(struct sunxi_drm_task *task, 583 void (*fn)(struct sunxi_drm_task *)) 584 { 585 586 task->sdt_fn = fn; 587 } 588 589 void 590 sunxi_task_schedule(device_t self, struct sunxi_drm_task *task) 591 { 592 struct sunxi_drm_softc *sc = device_private(self); 593 594 if (atomic_load_relaxed(&sc->sc_task_thread) == curlwp) 595 SIMPLEQ_INSERT_TAIL(&sc->sc_tasks, task, sdt_u.queue); 596 else 597 workqueue_enqueue(sc->sc_task_wq, &task->sdt_u.work, NULL); 598 } 599
Indexes created Wed Sep 24 05:09:52 GMT 2025