sunxi_drm.c revision 1.25
1 /* $NetBSD: sunxi_drm.c,v 1.25 2022/06/28 05:19:03 skrll 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 1.25 2022/06/28 05:19:03 skrll 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,sun8i-v3s-display-engine" }, 73 { .compat = "allwinner,sun50i-a64-display-engine" }, 74 DEVICE_COMPAT_EOL 75 }; 76 77 static const char * fb_compatible[] = { 78 "allwinner,simple-framebuffer", 79 NULL 80 }; 81 82 static int sunxi_drm_match(device_t, cfdata_t, void *); 83 static void sunxi_drm_attach(device_t, device_t, void *); 84 85 static void sunxi_drm_init(device_t); 86 static vmem_t *sunxi_drm_alloc_cma_pool(struct drm_device *, size_t); 87 88 static uint32_t sunxi_drm_get_vblank_counter(struct drm_device *, unsigned int); 89 static int sunxi_drm_enable_vblank(struct drm_device *, unsigned int); 90 static void sunxi_drm_disable_vblank(struct drm_device *, unsigned int); 91 92 static int sunxi_drm_load(struct drm_device *, unsigned long); 93 static void sunxi_drm_unload(struct drm_device *); 94 95 static void sunxi_drm_task_work(struct work *, void *); 96 97 static struct drm_driver sunxi_drm_driver = { 98 .driver_features = DRIVER_MODESET | DRIVER_GEM, 99 .dev_priv_size = 0, 100 .load = sunxi_drm_load, 101 .unload = sunxi_drm_unload, 102 103 .gem_free_object = drm_gem_cma_free_object, 104 .mmap_object = drm_gem_or_legacy_mmap_object, 105 .gem_uvm_ops = &drm_gem_cma_uvm_ops, 106 107 .dumb_create = drm_gem_cma_dumb_create, 108 .dumb_destroy = drm_gem_dumb_destroy, 109 110 .get_vblank_counter = sunxi_drm_get_vblank_counter, 111 .enable_vblank = sunxi_drm_enable_vblank, 112 .disable_vblank = sunxi_drm_disable_vblank, 113 114 .name = DRIVER_NAME, 115 .desc = DRIVER_DESC, 116 .date = DRIVER_DATE, 117 .major = DRIVER_MAJOR, 118 .minor = DRIVER_MINOR, 119 .patchlevel = DRIVER_PATCHLEVEL, 120 }; 121 122 CFATTACH_DECL_NEW(sunxi_drm, sizeof(struct sunxi_drm_softc), 123 sunxi_drm_match, sunxi_drm_attach, NULL, NULL); 124 125 static int 126 sunxi_drm_match(device_t parent, cfdata_t cf, void *aux) 127 { 128 struct fdt_attach_args * const faa = aux; 129 130 return of_compatible_match(faa->faa_phandle, compat_data); 131 } 132 133 static void 134 sunxi_drm_attach(device_t parent, device_t self, void *aux) 135 { 136 struct sunxi_drm_softc * const sc = device_private(self); 137 struct fdt_attach_args * const faa = aux; 138 struct drm_driver * const driver = &sunxi_drm_driver; 139 prop_dictionary_t dict = device_properties(self); 140 bool is_disabled; 141 142 aprint_naive("\n"); 143 144 if (prop_dictionary_get_bool(dict, "disabled", &is_disabled) && 145 is_disabled) { 146 aprint_normal(": Display Engine Pipeline (disabled)\n"); 147 return; 148 } 149 150 aprint_normal(": Display Engine Pipeline\n"); 151 152 sc->sc_dev = self; 153 sc->sc_dmat = faa->faa_dmat; 154 sc->sc_bst = faa->faa_bst; 155 sc->sc_phandle = faa->faa_phandle; 156 sc->sc_task_thread = NULL; 157 SIMPLEQ_INIT(&sc->sc_tasks); 158 if (workqueue_create(&sc->sc_task_wq, "sunxidrm", 159 &sunxi_drm_task_work, NULL, PRI_NONE, IPL_NONE, WQ_MPSAFE)) { 160 aprint_error_dev(self, "unable to create workqueue\n"); 161 sc->sc_task_wq = NULL; 162 return; 163 } 164 165 sc->sc_ddev = drm_dev_alloc(driver, sc->sc_dev); 166 if (IS_ERR(sc->sc_ddev)) { 167 aprint_error_dev(self, "couldn't allocate DRM device\n"); 168 return; 169 } 170 sc->sc_ddev->dev_private = sc; 171 sc->sc_ddev->bst = sc->sc_bst; 172 sc->sc_ddev->bus_dmat = sc->sc_dmat; 173 sc->sc_ddev->dmat = sc->sc_ddev->bus_dmat; 174 sc->sc_ddev->dmat_subregion_p = false; 175 176 fdt_remove_bycompat(fb_compatible); 177 178 config_defer(self, sunxi_drm_init); 179 } 180 181 static void 182 sunxi_drm_init(device_t dev) 183 { 184 struct sunxi_drm_softc * const sc = device_private(dev); 185 struct drm_driver * const driver = &sunxi_drm_driver; 186 int error; 187 188 /* 189 * Cause any tasks issued synchronously during attach to be 190 * processed at the end of this function. 191 */ 192 sc->sc_task_thread = curlwp; 193 194 error = -drm_dev_register(sc->sc_ddev, 0); 195 if (error) { 196 aprint_error_dev(dev, "couldn't register DRM device: %d\n", 197 error); 198 goto out; 199 } 200 sc->sc_dev_registered = true; 201 202 aprint_normal_dev(dev, "initialized %s %d.%d.%d %s on minor %d\n", 203 driver->name, driver->major, driver->minor, driver->patchlevel, 204 driver->date, sc->sc_ddev->primary->index); 205 206 /* 207 * Process asynchronous tasks queued synchronously during 208 * attach. This will be for display detection to attach a 209 * framebuffer, so we have the opportunity for a console device 210 * to attach before autoconf has completed, in time for init(8) 211 * to find that console without panicking. 212 */ 213 while (!SIMPLEQ_EMPTY(&sc->sc_tasks)) { 214 struct sunxi_drm_task *const task = 215 SIMPLEQ_FIRST(&sc->sc_tasks); 216 217 SIMPLEQ_REMOVE_HEAD(&sc->sc_tasks, sdt_u.queue); 218 (*task->sdt_fn)(task); 219 } 220 221 out: /* Cause any subsequent tasks to be processed by the workqueue. */ 222 atomic_store_relaxed(&sc->sc_task_thread, NULL); 223 } 224 225 static vmem_t * 226 sunxi_drm_alloc_cma_pool(struct drm_device *ddev, size_t cma_size) 227 { 228 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 229 bus_dma_segment_t segs[1]; 230 int nsegs; 231 int error; 232 233 error = bus_dmamem_alloc(sc->sc_dmat, cma_size, PAGE_SIZE, 0, 234 segs, 1, &nsegs, BUS_DMA_NOWAIT); 235 if (error) { 236 aprint_error_dev(sc->sc_dev, "couldn't allocate CMA pool\n"); 237 return NULL; 238 } 239 240 return vmem_create("sunxidrm", segs[0].ds_addr, segs[0].ds_len, 241 PAGE_SIZE, NULL, NULL, NULL, 0, VM_SLEEP, IPL_NONE); 242 } 243 244 static int 245 sunxi_drm_fb_create_handle(struct drm_framebuffer *fb, 246 struct drm_file *file, unsigned int *handle) 247 { 248 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(fb); 249 250 return drm_gem_handle_create(file, &sfb->obj->base, handle); 251 } 252 253 static void 254 sunxi_drm_fb_destroy(struct drm_framebuffer *fb) 255 { 256 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(fb); 257 258 drm_framebuffer_cleanup(fb); 259 drm_gem_object_put_unlocked(&sfb->obj->base); 260 kmem_free(sfb, sizeof(*sfb)); 261 } 262 263 static const struct drm_framebuffer_funcs sunxi_drm_framebuffer_funcs = { 264 .create_handle = sunxi_drm_fb_create_handle, 265 .destroy = sunxi_drm_fb_destroy, 266 }; 267 268 static struct drm_framebuffer * 269 sunxi_drm_fb_create(struct drm_device *ddev, struct drm_file *file, 270 const struct drm_mode_fb_cmd2 *cmd) 271 { 272 struct sunxi_drm_framebuffer *fb; 273 struct drm_gem_object *gem_obj; 274 int error; 275 276 if (cmd->flags) 277 return NULL; 278 279 gem_obj = drm_gem_object_lookup(file, cmd->handles[0]); 280 if (gem_obj == NULL) 281 return NULL; 282 283 fb = kmem_zalloc(sizeof(*fb), KM_SLEEP); 284 fb->obj = to_drm_gem_cma_obj(gem_obj); 285 drm_helper_mode_fill_fb_struct(ddev, &fb->base, cmd); 286 287 error = drm_framebuffer_init(ddev, &fb->base, &sunxi_drm_framebuffer_funcs); 288 if (error != 0) 289 goto dealloc; 290 291 return &fb->base; 292 293 dealloc: 294 drm_framebuffer_cleanup(&fb->base); 295 kmem_free(fb, sizeof(*fb)); 296 drm_gem_object_put_unlocked(gem_obj); 297 298 return NULL; 299 } 300 301 static struct drm_mode_config_funcs sunxi_drm_mode_config_funcs = { 302 .fb_create = sunxi_drm_fb_create, 303 }; 304 305 static int 306 sunxi_drm_simplefb_lookup(bus_addr_t *paddr, bus_size_t *psize) 307 { 308 static const struct device_compatible_entry simplefb_compat[] = { 309 { .compat = "simple-framebuffer" }, 310 DEVICE_COMPAT_EOL 311 }; 312 int chosen, child, error; 313 bus_addr_t addr_end; 314 315 chosen = OF_finddevice("/chosen"); 316 if (chosen == -1) 317 return ENOENT; 318 319 for (child = OF_child(chosen); child; child = OF_peer(child)) { 320 if (!fdtbus_status_okay(child)) 321 continue; 322 if (!of_compatible_match(child, simplefb_compat)) 323 continue; 324 error = fdtbus_get_reg(child, 0, paddr, psize); 325 if (error != 0) 326 return error; 327 328 /* Reclaim entire pages used by the simplefb */ 329 addr_end = *paddr + *psize; 330 *paddr = SUNXI_TRUNC_PAGE(*paddr); 331 *psize = SUNXI_ROUND_PAGE(addr_end - *paddr); 332 return 0; 333 } 334 335 return ENOENT; 336 } 337 338 static int 339 sunxi_drm_fb_probe(struct drm_fb_helper *helper, struct drm_fb_helper_surface_size *sizes) 340 { 341 struct sunxi_drm_softc * const sc = sunxi_drm_private(helper->dev); 342 struct drm_device *ddev = helper->dev; 343 struct sunxi_drm_framebuffer *sfb = to_sunxi_drm_framebuffer(helper->fb); 344 struct drm_framebuffer *fb = helper->fb; 345 struct sunxi_drmfb_attach_args sfa; 346 bus_addr_t sfb_addr; 347 bus_size_t sfb_size; 348 size_t cma_size; 349 int error; 350 351 const u_int width = sizes->surface_width; 352 const u_int height = sizes->surface_height; 353 const u_int pitch = width * (32 / 8); 354 355 const size_t size = roundup(height * pitch, PAGE_SIZE); 356 357 if (sunxi_drm_simplefb_lookup(&sfb_addr, &sfb_size) != 0) 358 sfb_size = 0; 359 360 /* Reserve enough memory for a 4K plane, rounded to 1MB */ 361 cma_size = (SUNXI_DRM_MAX_WIDTH * SUNXI_DRM_MAX_HEIGHT * 4); 362 if (sfb_size == 0) { 363 /* Add memory for FB console if we cannot reclaim bootloader memory */ 364 cma_size += size; 365 } 366 cma_size = roundup(cma_size, 1024 * 1024); 367 sc->sc_ddev->cma_pool = sunxi_drm_alloc_cma_pool(sc->sc_ddev, cma_size); 368 if (sc->sc_ddev->cma_pool != NULL) { 369 if (sfb_size != 0) { 370 error = vmem_add(sc->sc_ddev->cma_pool, sfb_addr, 371 sfb_size, VM_SLEEP); 372 if (error != 0) 373 sfb_size = 0; 374 } 375 aprint_normal_dev(sc->sc_dev, "reserved %u MB DRAM for CMA", 376 (u_int)((cma_size + sfb_size) / (1024 * 1024))); 377 if (sfb_size != 0) 378 aprint_normal(" (%u MB reclaimed from bootloader)", 379 (u_int)(sfb_size / (1024 * 1024))); 380 aprint_normal("\n"); 381 } 382 383 sfb->obj = drm_gem_cma_create(ddev, size); 384 if (sfb->obj == NULL) { 385 DRM_ERROR("failed to allocate memory for framebuffer\n"); 386 return -ENOMEM; 387 } 388 389 fb->pitches[0] = pitch; 390 fb->offsets[0] = 0; 391 fb->width = width; 392 fb->height = height; 393 fb->format = drm_format_info(DRM_FORMAT_XRGB8888); 394 fb->dev = ddev; 395 396 error = drm_framebuffer_init(ddev, fb, &sunxi_drm_framebuffer_funcs); 397 if (error != 0) { 398 DRM_ERROR("failed to initialize framebuffer\n"); 399 return error; 400 } 401 402 memset(&sfa, 0, sizeof(sfa)); 403 sfa.sfa_drm_dev = ddev; 404 sfa.sfa_fb_helper = helper; 405 sfa.sfa_fb_sizes = *sizes; 406 sfa.sfa_fb_bst = sc->sc_bst; 407 sfa.sfa_fb_dmat = sc->sc_dmat; 408 sfa.sfa_fb_linebytes = helper->fb->pitches[0]; 409 410 helper->fbdev = config_found(ddev->dev, &sfa, NULL, 411 CFARGS(.iattr = "sunxifbbus")); 412 if (helper->fbdev == NULL) { 413 DRM_ERROR("unable to attach framebuffer\n"); 414 return -ENXIO; 415 } 416 417 return 0; 418 } 419 420 static struct drm_fb_helper_funcs sunxi_drm_fb_helper_funcs = { 421 .fb_probe = sunxi_drm_fb_probe, 422 }; 423 424 static int 425 sunxi_drm_load(struct drm_device *ddev, unsigned long flags) 426 { 427 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 428 struct sunxi_drm_endpoint *sep; 429 struct sunxi_drm_fbdev *fbdev; 430 const u_int *data; 431 int datalen, error, num_crtc; 432 433 drm_mode_config_init(ddev); 434 ddev->mode_config.min_width = 0; 435 ddev->mode_config.min_height = 0; 436 ddev->mode_config.max_width = SUNXI_DRM_MAX_WIDTH; 437 ddev->mode_config.max_height = SUNXI_DRM_MAX_HEIGHT; 438 ddev->mode_config.funcs = &sunxi_drm_mode_config_funcs; 439 440 num_crtc = 0; 441 data = fdtbus_get_prop(sc->sc_phandle, "allwinner,pipelines", &datalen); 442 while (datalen >= 4) { 443 const int crtc_phandle = fdtbus_get_phandle_from_native(be32dec(data)); 444 445 TAILQ_FOREACH(sep, &sunxi_drm_endpoints, entries) 446 if (sep->phandle == crtc_phandle && sep->ddev == NULL) { 447 sep->ddev = ddev; 448 error = fdt_endpoint_activate_direct(sep->ep, true); 449 if (error != 0) { 450 aprint_error_dev(sc->sc_dev, "failed to activate endpoint: %d\n", 451 error); 452 } 453 if (fdt_endpoint_type(sep->ep) == EP_DRM_CRTC) 454 num_crtc++; 455 } 456 457 datalen -= 4; 458 data++; 459 } 460 461 if (num_crtc == 0) { 462 aprint_error_dev(sc->sc_dev, "no pipelines configured\n"); 463 error = ENXIO; 464 goto drmerr; 465 } 466 467 fbdev = kmem_zalloc(sizeof(*fbdev), KM_SLEEP); 468 469 drm_fb_helper_prepare(ddev, &fbdev->helper, &sunxi_drm_fb_helper_funcs); 470 471 error = drm_fb_helper_init(ddev, &fbdev->helper, num_crtc); 472 if (error) 473 goto allocerr; 474 475 fbdev->helper.fb = kmem_zalloc(sizeof(struct sunxi_drm_framebuffer), KM_SLEEP); 476 477 drm_fb_helper_single_add_all_connectors(&fbdev->helper); 478 479 drm_helper_disable_unused_functions(ddev); 480 481 drm_fb_helper_initial_config(&fbdev->helper, 32); 482 483 /* XXX */ 484 ddev->irq_enabled = true; 485 drm_vblank_init(ddev, num_crtc); 486 487 return 0; 488 489 allocerr: 490 kmem_free(fbdev, sizeof(*fbdev)); 491 drmerr: 492 drm_mode_config_cleanup(ddev); 493 494 return error; 495 } 496 497 static uint32_t 498 sunxi_drm_get_vblank_counter(struct drm_device *ddev, unsigned int crtc) 499 { 500 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 501 502 if (crtc >= __arraycount(sc->sc_vbl)) 503 return 0; 504 505 if (sc->sc_vbl[crtc].get_vblank_counter == NULL) 506 return 0; 507 508 return sc->sc_vbl[crtc].get_vblank_counter(sc->sc_vbl[crtc].priv); 509 } 510 511 static int 512 sunxi_drm_enable_vblank(struct drm_device *ddev, unsigned int crtc) 513 { 514 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 515 516 if (crtc >= __arraycount(sc->sc_vbl)) 517 return 0; 518 519 if (sc->sc_vbl[crtc].enable_vblank == NULL) 520 return 0; 521 522 sc->sc_vbl[crtc].enable_vblank(sc->sc_vbl[crtc].priv); 523 524 return 0; 525 } 526 527 static void 528 sunxi_drm_disable_vblank(struct drm_device *ddev, unsigned int crtc) 529 { 530 struct sunxi_drm_softc * const sc = sunxi_drm_private(ddev); 531 532 if (crtc >= __arraycount(sc->sc_vbl)) 533 return; 534 535 if (sc->sc_vbl[crtc].disable_vblank == NULL) 536 return; 537 538 sc->sc_vbl[crtc].disable_vblank(sc->sc_vbl[crtc].priv); 539 } 540 541 static void 542 sunxi_drm_unload(struct drm_device *ddev) 543 { 544 drm_mode_config_cleanup(ddev); 545 } 546 547 int 548 sunxi_drm_register_endpoint(int phandle, struct fdt_endpoint *ep) 549 { 550 struct sunxi_drm_endpoint *sep; 551 552 sep = kmem_zalloc(sizeof(*sep), KM_SLEEP); 553 sep->phandle = phandle; 554 sep->ep = ep; 555 sep->ddev = NULL; 556 TAILQ_INSERT_TAIL(&sunxi_drm_endpoints, sep, entries); 557 558 return 0; 559 } 560 561 struct drm_device * 562 sunxi_drm_endpoint_device(struct fdt_endpoint *ep) 563 { 564 struct sunxi_drm_endpoint *sep; 565 566 TAILQ_FOREACH(sep, &sunxi_drm_endpoints, entries) 567 if (sep->ep == ep) 568 return sep->ddev; 569 570 return NULL; 571 } 572 573 static void 574 sunxi_drm_task_work(struct work *work, void *cookie) 575 { 576 struct sunxi_drm_task *task = container_of(work, struct sunxi_drm_task, 577 sdt_u.work); 578 579 (*task->sdt_fn)(task); 580 } 581 582 void 583 sunxi_task_init(struct sunxi_drm_task *task, 584 void (*fn)(struct sunxi_drm_task *)) 585 { 586 587 task->sdt_fn = fn; 588 } 589 590 void 591 sunxi_task_schedule(device_t self, struct sunxi_drm_task *task) 592 { 593 struct sunxi_drm_softc *sc = device_private(self); 594 595 if (atomic_load_relaxed(&sc->sc_task_thread) == curlwp) 596 SIMPLEQ_INSERT_TAIL(&sc->sc_tasks, task, sdt_u.queue); 597 else 598 workqueue_enqueue(sc->sc_task_wq, &task->sdt_u.work, NULL); 599 } 600
Indexes created Tue Sep 30 07:10:03 GMT 2025