Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/arm/broadcom/bcm2835/bcm2838_pci.c
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1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2020 Dr Robert Harvey Crowston <crowston@protonmail.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 * 18 * 19 * $FreeBSD$ 20 * 21 */ 22 23 /* 24 * BCM2838-compatible PCI-express controller. 25 * 26 * Broadcom likes to give the same chip lots of different names. The name of 27 * this driver is taken from the Raspberry Pi 4 Broadcom 2838 chip. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/endian.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/bus.h> 39 #include <sys/proc.h> 40 #include <sys/rman.h> 41 #include <sys/intr.h> 42 #include <sys/mutex.h> 43 44 #include <dev/ofw/openfirm.h> 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/ofw_bus_subr.h> 47 48 #include <dev/pci/pci_host_generic.h> 49 #include <dev/pci/pci_host_generic_fdt.h> 50 #include <dev/pci/pcivar.h> 51 #include <dev/pci/pcireg.h> 52 #include <dev/pci/pcib_private.h> 53 54 #include <machine/bus.h> 55 #include <machine/intr.h> 56 57 #include "pcib_if.h" 58 #include "msi_if.h" 59 60 #define PCI_ID_VAL3 0x43c 61 #define CLASS_SHIFT 0x10 62 #define SUBCLASS_SHIFT 0x8 63 64 #define REG_CONTROLLER_HW_REV 0x406c 65 #define REG_BRIDGE_CTRL 0x9210 66 #define BRIDGE_DISABLE_FLAG 0x1 67 #define BRIDGE_RESET_FLAG 0x2 68 #define REG_BRIDGE_SERDES_MODE 0x4204 69 #define REG_DMA_CONFIG 0x4008 70 #define REG_DMA_WINDOW_LOW 0x4034 71 #define REG_DMA_WINDOW_HIGH 0x4038 72 #define REG_DMA_WINDOW_1 0x403c 73 #define REG_BRIDGE_GISB_WINDOW 0x402c 74 #define REG_BRIDGE_STATE 0x4068 75 #define REG_BRIDGE_LINK_STATE 0x00bc 76 #define REG_BUS_WINDOW_LOW 0x400c 77 #define REG_BUS_WINDOW_HIGH 0x4010 78 #define REG_CPU_WINDOW_LOW 0x4070 79 #define REG_CPU_WINDOW_START_HIGH 0x4080 80 #define REG_CPU_WINDOW_END_HIGH 0x4084 81 82 #define REG_MSI_ADDR_LOW 0x4044 83 #define REG_MSI_ADDR_HIGH 0x4048 84 #define REG_MSI_CONFIG 0x404c 85 #define REG_MSI_CLR 0x4508 86 #define REG_MSI_MASK_CLR 0x4514 87 #define REG_MSI_RAISED 0x4500 88 #define REG_MSI_EOI 0x4060 89 #define NUM_MSI 32 90 91 #define REG_EP_CONFIG_CHOICE 0x9000 92 #define REG_EP_CONFIG_DATA 0x8000 93 94 /* 95 * The system memory controller can address up to 16 GiB of physical memory 96 * (although at time of writing the largest memory size available for purchase 97 * is 8 GiB). However, the system DMA controller is capable of accessing only a 98 * limited portion of the address space. Worse, the PCI-e controller has further 99 * constraints for DMA, and those limitations are not wholly clear to the 100 * author. NetBSD and Linux allow DMA on the lower 3 GiB of the physical memory, 101 * but experimentation shows DMA performed above 960 MiB results in data 102 * corruption with this driver. The limit of 960 MiB is taken from OpenBSD, but 103 * apparently that value was chosen for satisfying a constraint of an unrelated 104 * peripheral. 105 * 106 * Whatever the true maximum address, 960 MiB works. 107 */ 108 #define DMA_HIGH_LIMIT 0x3c000000 109 #define MAX_MEMORY_LOG2 0x21 110 #define REG_VALUE_DMA_WINDOW_LOW (MAX_MEMORY_LOG2 - 0xf) 111 #define REG_VALUE_DMA_WINDOW_HIGH 0x0 112 #define DMA_WINDOW_ENABLE 0x3000 113 #define REG_VALUE_DMA_WINDOW_CONFIG \ 114 (((MAX_MEMORY_LOG2 - 0xf) << 0x1b) | DMA_WINDOW_ENABLE) 115 116 #define REG_VALUE_MSI_CONFIG 0xffe06540 117 118 struct bcm_pcib_irqsrc { 119 struct intr_irqsrc isrc; 120 u_int irq; 121 bool allocated; 122 }; 123 124 struct bcm_pcib_softc { 125 struct generic_pcie_fdt_softc base; 126 device_t dev; 127 bus_dma_tag_t dmat; 128 struct mtx config_mtx; 129 struct mtx msi_mtx; 130 struct resource *msi_irq_res; 131 void *msi_intr_cookie; 132 struct bcm_pcib_irqsrc *msi_isrcs; 133 pci_addr_t msi_addr; 134 }; 135 136 static struct ofw_compat_data compat_data[] = { 137 {"brcm,bcm2711-pcie", 1}, 138 {"brcm,bcm7211-pcie", 1}, 139 {"brcm,bcm7445-pcie", 1}, 140 {NULL, 0} 141 }; 142 143 static int 144 bcm_pcib_probe(device_t dev) 145 { 146 147 if (!ofw_bus_status_okay(dev)) 148 return (ENXIO); 149 150 if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) 151 return (ENXIO); 152 153 device_set_desc(dev, 154 "BCM2838-compatible PCI-express controller"); 155 return (BUS_PROBE_DEFAULT); 156 } 157 158 static bus_dma_tag_t 159 bcm_pcib_get_dma_tag(device_t dev, device_t child) 160 { 161 struct bcm_pcib_softc *sc; 162 163 sc = device_get_softc(dev); 164 return (sc->dmat); 165 } 166 167 static void 168 bcm_pcib_set_reg(struct bcm_pcib_softc *sc, uint32_t reg, uint32_t val) 169 { 170 171 bus_space_write_4(sc->base.base.bst, sc->base.base.bsh, reg, 172 htole32(val)); 173 } 174 175 static uint32_t 176 bcm_pcib_read_reg(struct bcm_pcib_softc *sc, uint32_t reg) 177 { 178 179 return (le32toh(bus_space_read_4(sc->base.base.bst, sc->base.base.bsh, 180 reg))); 181 } 182 183 static void 184 bcm_pcib_reset_controller(struct bcm_pcib_softc *sc) 185 { 186 uint32_t val; 187 188 val = bcm_pcib_read_reg(sc, REG_BRIDGE_CTRL); 189 val = val | BRIDGE_RESET_FLAG | BRIDGE_DISABLE_FLAG; 190 bcm_pcib_set_reg(sc, REG_BRIDGE_CTRL, val); 191 192 DELAY(100); 193 194 val = bcm_pcib_read_reg(sc, REG_BRIDGE_CTRL); 195 val = val & ~BRIDGE_RESET_FLAG; 196 bcm_pcib_set_reg(sc, REG_BRIDGE_CTRL, val); 197 198 DELAY(100); 199 200 bcm_pcib_set_reg(sc, REG_BRIDGE_SERDES_MODE, 0); 201 202 DELAY(100); 203 } 204 205 static void 206 bcm_pcib_enable_controller(struct bcm_pcib_softc *sc) 207 { 208 uint32_t val; 209 210 val = bcm_pcib_read_reg(sc, REG_BRIDGE_CTRL); 211 val = val & ~BRIDGE_DISABLE_FLAG; 212 bcm_pcib_set_reg(sc, REG_BRIDGE_CTRL, val); 213 214 DELAY(100); 215 } 216 217 static int 218 bcm_pcib_check_ranges(device_t dev) 219 { 220 struct bcm_pcib_softc *sc; 221 struct pcie_range *ranges; 222 int error = 0, i; 223 224 sc = device_get_softc(dev); 225 ranges = &sc->base.base.ranges[0]; 226 227 /* The first range needs to be non-zero. */ 228 if (ranges[0].size == 0) { 229 device_printf(dev, "error: first outbound memory range " 230 "(pci addr: 0x%jx, cpu addr: 0x%jx) has zero size.\n", 231 ranges[0].pci_base, ranges[0].phys_base); 232 error = ENXIO; 233 } 234 235 /* 236 * The controller can actually handle three distinct ranges, but we 237 * only implement support for one. 238 */ 239 for (i = 1; (bootverbose || error) && i < MAX_RANGES_TUPLES; ++i) { 240 if (ranges[i].size > 0) 241 device_printf(dev, 242 "note: outbound memory range %d (pci addr: 0x%jx, " 243 "cpu addr: 0x%jx, size: 0x%jx) will be ignored.\n", 244 i, ranges[i].pci_base, ranges[i].phys_base, 245 ranges[i].size); 246 } 247 248 return (error); 249 } 250 251 static const char * 252 bcm_pcib_link_state_string(uint32_t mode) 253 { 254 255 switch(mode & PCIEM_LINK_STA_SPEED) { 256 case 0: 257 return ("not up"); 258 case 1: 259 return ("2.5 GT/s"); 260 case 2: 261 return ("5.0 GT/s"); 262 case 4: 263 return ("8.0 GT/s"); 264 default: 265 return ("unknown"); 266 } 267 } 268 269 static bus_addr_t 270 bcm_get_offset_and_prepare_config(struct bcm_pcib_softc *sc, u_int bus, 271 u_int slot, u_int func, u_int reg) 272 { 273 /* 274 * Config for an end point is only available through a narrow window for 275 * one end point at a time. We first tell the controller which end point 276 * we want, then access it through the window. 277 */ 278 uint32_t func_index; 279 280 if (bus == 0 && slot == 0 && func == 0) 281 /* 282 * Special case for root device; its config is always available 283 * through the zero-offset. 284 */ 285 return (reg); 286 287 /* Tell the controller to show us the config in question. */ 288 func_index = PCIE_ADDR_OFFSET(bus, slot, func, 0); 289 bcm_pcib_set_reg(sc, REG_EP_CONFIG_CHOICE, func_index); 290 291 return (REG_EP_CONFIG_DATA + reg); 292 } 293 294 static bool 295 bcm_pcib_is_valid_quad(struct bcm_pcib_softc *sc, u_int bus, u_int slot, 296 u_int func, u_int reg) 297 { 298 299 if ((bus < sc->base.base.bus_start) || (bus > sc->base.base.bus_end)) 300 return (false); 301 if ((slot > PCI_SLOTMAX) || (func > PCI_FUNCMAX) || (reg > PCIE_REGMAX)) 302 return (false); 303 304 if (bus == 0 && slot == 0 && func == 0) 305 return (true); 306 if (bus == 0) 307 /* 308 * Probing other slots and funcs on bus 0 will lock up the 309 * memory controller. 310 */ 311 return (false); 312 313 return (true); 314 } 315 316 static uint32_t 317 bcm_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 318 int bytes) 319 { 320 struct bcm_pcib_softc *sc; 321 bus_space_handle_t h; 322 bus_space_tag_t t; 323 bus_addr_t offset; 324 uint32_t data; 325 326 sc = device_get_softc(dev); 327 if (!bcm_pcib_is_valid_quad(sc, bus, slot, func, reg)) 328 return (~0U); 329 330 mtx_lock(&sc->config_mtx); 331 offset = bcm_get_offset_and_prepare_config(sc, bus, slot, func, reg); 332 333 t = sc->base.base.bst; 334 h = sc->base.base.bsh; 335 336 switch (bytes) { 337 case 1: 338 data = bus_space_read_1(t, h, offset); 339 break; 340 case 2: 341 data = le16toh(bus_space_read_2(t, h, offset)); 342 break; 343 case 4: 344 data = le32toh(bus_space_read_4(t, h, offset)); 345 break; 346 default: 347 data = ~0U; 348 break; 349 } 350 351 mtx_unlock(&sc->config_mtx); 352 return (data); 353 } 354 355 static void 356 bcm_pcib_write_config(device_t dev, u_int bus, u_int slot, 357 u_int func, u_int reg, uint32_t val, int bytes) 358 { 359 struct bcm_pcib_softc *sc; 360 bus_space_handle_t h; 361 bus_space_tag_t t; 362 uint32_t offset; 363 364 sc = device_get_softc(dev); 365 if (!bcm_pcib_is_valid_quad(sc, bus, slot, func, reg)) 366 return; 367 368 mtx_lock(&sc->config_mtx); 369 offset = bcm_get_offset_and_prepare_config(sc, bus, slot, func, reg); 370 371 t = sc->base.base.bst; 372 h = sc->base.base.bsh; 373 374 switch (bytes) { 375 case 1: 376 bus_space_write_1(t, h, offset, val); 377 break; 378 case 2: 379 bus_space_write_2(t, h, offset, htole16(val)); 380 break; 381 case 4: 382 bus_space_write_4(t, h, offset, htole32(val)); 383 break; 384 default: 385 break; 386 } 387 388 mtx_unlock(&sc->config_mtx); 389 } 390 391 static void 392 bcm_pcib_msi_intr_process(struct bcm_pcib_softc *sc, uint32_t interrupt_bitmap, 393 struct trapframe *tf) 394 { 395 struct bcm_pcib_irqsrc *irqsrc; 396 uint32_t bit, irq; 397 398 while ((bit = ffs(interrupt_bitmap))) { 399 irq = bit - 1; 400 401 /* Acknowledge interrupt. */ 402 bcm_pcib_set_reg(sc, REG_MSI_CLR, 1 << irq); 403 404 /* Send EOI. */ 405 bcm_pcib_set_reg(sc, REG_MSI_EOI, 1); 406 407 /* Despatch to handler. */ 408 irqsrc = &sc->msi_isrcs[irq]; 409 if (intr_isrc_dispatch(&irqsrc->isrc, tf)) 410 device_printf(sc->dev, 411 "note: unexpected interrupt (%d) triggered.\n", 412 irq); 413 414 /* Done with this interrupt. */ 415 interrupt_bitmap = interrupt_bitmap & ~(1 << irq); 416 } 417 } 418 419 static int 420 bcm_pcib_msi_intr(void *arg) 421 { 422 struct bcm_pcib_softc *sc; 423 struct trapframe *tf; 424 uint32_t interrupt_bitmap; 425 426 sc = (struct bcm_pcib_softc *) arg; 427 tf = curthread->td_intr_frame; 428 429 while ((interrupt_bitmap = bcm_pcib_read_reg(sc, REG_MSI_RAISED))) 430 bcm_pcib_msi_intr_process(sc, interrupt_bitmap, tf); 431 432 return (FILTER_HANDLED); 433 } 434 435 static int 436 bcm_pcib_alloc_msi(device_t dev, device_t child, int count, int maxcount, 437 device_t *pic, struct intr_irqsrc **srcs) 438 { 439 struct bcm_pcib_softc *sc; 440 int first_int, i; 441 442 sc = device_get_softc(dev); 443 mtx_lock(&sc->msi_mtx); 444 445 /* Find a continguous region of free message-signalled interrupts. */ 446 for (first_int = 0; first_int + count < NUM_MSI; ) { 447 for (i = first_int; i < first_int + count; ++i) { 448 if (sc->msi_isrcs[i].allocated) 449 goto next; 450 } 451 goto found; 452 next: 453 first_int = i + 1; 454 } 455 456 /* No appropriate region available. */ 457 mtx_unlock(&sc->msi_mtx); 458 device_printf(dev, "warning: failed to allocate %d MSI messages.\n", 459 count); 460 return (ENXIO); 461 462 found: 463 /* Mark the messages as in use. */ 464 for (i = 0; i < count; ++i) { 465 sc->msi_isrcs[i + first_int].allocated = true; 466 srcs[i] = &(sc->msi_isrcs[i + first_int].isrc); 467 } 468 469 mtx_unlock(&sc->msi_mtx); 470 *pic = device_get_parent(dev); 471 472 return (0); 473 } 474 475 static int 476 bcm_pcib_map_msi(device_t dev, device_t child, struct intr_irqsrc *isrc, 477 uint64_t *addr, uint32_t *data) 478 { 479 struct bcm_pcib_softc *sc; 480 struct bcm_pcib_irqsrc *msi_msg; 481 482 sc = device_get_softc(dev); 483 msi_msg = (struct bcm_pcib_irqsrc *) isrc; 484 485 *addr = sc->msi_addr; 486 *data = (REG_VALUE_MSI_CONFIG & 0xffff) | msi_msg->irq; 487 return (0); 488 } 489 490 static int 491 bcm_pcib_release_msi(device_t dev, device_t child, int count, 492 struct intr_irqsrc **isrc) 493 { 494 struct bcm_pcib_softc *sc; 495 struct bcm_pcib_irqsrc *msi_isrc; 496 int i; 497 498 sc = device_get_softc(dev); 499 mtx_lock(&sc->msi_mtx); 500 501 for (i = 0; i < count; i++) { 502 msi_isrc = (struct bcm_pcib_irqsrc *) isrc[i]; 503 msi_isrc->allocated = false; 504 } 505 506 mtx_unlock(&sc->msi_mtx); 507 return (0); 508 } 509 510 static int 511 bcm_pcib_msi_attach(device_t dev) 512 { 513 struct bcm_pcib_softc *sc; 514 phandle_t node, xref; 515 char const *bcm_name; 516 int error, i, rid; 517 518 sc = device_get_softc(dev); 519 sc->msi_addr = 0xffffffffc; 520 521 /* Clear any pending interrupts. */ 522 bcm_pcib_set_reg(sc, REG_MSI_CLR, 0xffffffff); 523 524 rid = 1; 525 sc->msi_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 526 RF_ACTIVE); 527 if (sc->msi_irq_res == NULL) { 528 device_printf(dev, "could not allocate MSI irq resource.\n"); 529 return (ENXIO); 530 } 531 532 sc->msi_isrcs = malloc(sizeof(*sc->msi_isrcs) * NUM_MSI, M_DEVBUF, 533 M_WAITOK | M_ZERO); 534 535 error = bus_setup_intr(dev, sc->msi_irq_res, INTR_TYPE_BIO | 536 INTR_MPSAFE, bcm_pcib_msi_intr, NULL, sc, &sc->msi_intr_cookie); 537 if (error != 0) { 538 device_printf(dev, "error: failed to setup MSI handler.\n"); 539 return (error); 540 } 541 542 bcm_name = device_get_nameunit(dev); 543 for (i = 0; i < NUM_MSI; i++) { 544 sc->msi_isrcs[i].irq = i; 545 error = intr_isrc_register(&sc->msi_isrcs[i].isrc, dev, 0, 546 "%s,%u", bcm_name, i); 547 if (error != 0) { 548 device_printf(dev, 549 "error: failed to register interrupt %d.\n", i); 550 return (error); 551 } 552 } 553 554 node = ofw_bus_get_node(dev); 555 xref = OF_xref_from_node(node); 556 OF_device_register_xref(xref, dev); 557 558 error = intr_msi_register(dev, xref); 559 if (error != 0) 560 return (error); 561 562 mtx_init(&sc->msi_mtx, "bcm_pcib: msi_mtx", NULL, MTX_DEF); 563 564 bcm_pcib_set_reg(sc, REG_MSI_MASK_CLR, 0xffffffff); 565 bcm_pcib_set_reg(sc, REG_MSI_ADDR_LOW, (sc->msi_addr & 0xffffffff) | 1); 566 bcm_pcib_set_reg(sc, REG_MSI_ADDR_HIGH, (sc->msi_addr >> 32)); 567 bcm_pcib_set_reg(sc, REG_MSI_CONFIG, REG_VALUE_MSI_CONFIG); 568 569 return (0); 570 } 571 572 static void 573 bcm_pcib_relocate_bridge_window(device_t dev) 574 { 575 /* 576 * In principle an out-of-bounds bridge window could be automatically 577 * adjusted at resource-activation time to lie within the bus address 578 * space by pcib_grow_window(), but that is not possible because the 579 * out-of-bounds resource allocation fails at allocation time. Instead, 580 * we will just fix up the window on the controller here, before it is 581 * re-discovered by pcib_probe_windows(). 582 */ 583 584 struct bcm_pcib_softc *sc; 585 pci_addr_t base, size, new_base, new_limit; 586 uint16_t val; 587 588 sc = device_get_softc(dev); 589 590 val = bcm_pcib_read_config(dev, 0, 0, 0, PCIR_MEMBASE_1, 2); 591 base = PCI_PPBMEMBASE(0, val); 592 593 val = bcm_pcib_read_config(dev, 0, 0, 0, PCIR_MEMLIMIT_1, 2); 594 size = PCI_PPBMEMLIMIT(0, val) - base; 595 596 new_base = sc->base.base.ranges[0].pci_base; 597 val = (uint16_t) (new_base >> 16); 598 bcm_pcib_write_config(dev, 0, 0, 0, PCIR_MEMBASE_1, val, 2); 599 600 new_limit = new_base + size; 601 val = (uint16_t) (new_limit >> 16); 602 bcm_pcib_write_config(dev, 0, 0, 0, PCIR_MEMLIMIT_1, val, 2); 603 } 604 605 static uint32_t 606 encode_cpu_window_low(pci_addr_t phys_base, bus_size_t size) 607 { 608 609 return (((phys_base >> 0x10) & 0xfff0) | 610 ((phys_base + size - 1) & 0xfff00000)); 611 } 612 613 static uint32_t 614 encode_cpu_window_start_high(pci_addr_t phys_base) 615 { 616 617 return ((phys_base >> 0x20) & 0xff); 618 } 619 620 static uint32_t 621 encode_cpu_window_end_high(pci_addr_t phys_base, bus_size_t size) 622 { 623 624 return (((phys_base + size - 1) >> 0x20) & 0xff); 625 } 626 627 static int 628 bcm_pcib_attach(device_t dev) 629 { 630 struct bcm_pcib_softc *sc; 631 pci_addr_t phys_base, pci_base; 632 bus_size_t size; 633 uint32_t hardware_rev, bridge_state, link_state; 634 int error, tries; 635 636 sc = device_get_softc(dev); 637 sc->dev = dev; 638 639 /* 640 * This tag will be used in preference to the one created in 641 * pci_host_generic.c. 642 */ 643 error = bus_dma_tag_create(bus_get_dma_tag(dev), /* parent */ 644 1, 0, /* alignment, bounds */ 645 DMA_HIGH_LIMIT, /* lowaddr */ 646 BUS_SPACE_MAXADDR, /* highaddr */ 647 NULL, NULL, /* filter, filterarg */ 648 DMA_HIGH_LIMIT, /* maxsize */ 649 BUS_SPACE_UNRESTRICTED, /* nsegments */ 650 DMA_HIGH_LIMIT, /* maxsegsize */ 651 0, /* flags */ 652 NULL, NULL, /* lockfunc, lockarg */ 653 &sc->dmat); 654 if (error != 0) 655 return (error); 656 657 error = pci_host_generic_setup_fdt(dev); 658 if (error != 0) 659 return (error); 660 661 error = bcm_pcib_check_ranges(dev); 662 if (error != 0) 663 return (error); 664 665 mtx_init(&sc->config_mtx, "bcm_pcib: config_mtx", NULL, MTX_DEF); 666 667 bcm_pcib_reset_controller(sc); 668 669 hardware_rev = bcm_pcib_read_reg(sc, REG_CONTROLLER_HW_REV) & 0xffff; 670 device_printf(dev, "hardware identifies as revision 0x%x.\n", 671 hardware_rev); 672 673 /* 674 * Set PCI->CPU memory window. This encodes the inbound window showing 675 * the system memory to the controller. 676 */ 677 bcm_pcib_set_reg(sc, REG_DMA_WINDOW_LOW, REG_VALUE_DMA_WINDOW_LOW); 678 bcm_pcib_set_reg(sc, REG_DMA_WINDOW_HIGH, REG_VALUE_DMA_WINDOW_HIGH); 679 bcm_pcib_set_reg(sc, REG_DMA_CONFIG, REG_VALUE_DMA_WINDOW_CONFIG); 680 681 bcm_pcib_set_reg(sc, REG_BRIDGE_GISB_WINDOW, 0); 682 bcm_pcib_set_reg(sc, REG_DMA_WINDOW_1, 0); 683 684 bcm_pcib_enable_controller(sc); 685 686 /* Wait for controller to start. */ 687 for(tries = 0; ; ++tries) { 688 bridge_state = bcm_pcib_read_reg(sc, REG_BRIDGE_STATE); 689 690 if ((bridge_state & 0x30) == 0x30) 691 /* Controller ready. */ 692 break; 693 694 if (tries > 100) { 695 device_printf(dev, 696 "error: controller failed to start.\n"); 697 return (ENXIO); 698 } 699 700 DELAY(1000); 701 } 702 703 link_state = bcm_pcib_read_reg(sc, REG_BRIDGE_LINK_STATE) >> 0x10; 704 if (!link_state) { 705 device_printf(dev, "error: controller started but link is not " 706 "up.\n"); 707 return (ENXIO); 708 } 709 if (bootverbose) 710 device_printf(dev, "note: reported link speed is %s.\n", 711 bcm_pcib_link_state_string(link_state)); 712 713 /* 714 * Set the CPU->PCI memory window. The map in this direction is not 1:1. 715 * Addresses seen by the CPU need to be adjusted to make sense to the 716 * controller as they pass through the window. 717 */ 718 pci_base = sc->base.base.ranges[0].pci_base; 719 phys_base = sc->base.base.ranges[0].phys_base; 720 size = sc->base.base.ranges[0].size; 721 722 bcm_pcib_set_reg(sc, REG_BUS_WINDOW_LOW, pci_base & 0xffffffff); 723 bcm_pcib_set_reg(sc, REG_BUS_WINDOW_HIGH, pci_base >> 32); 724 725 bcm_pcib_set_reg(sc, REG_CPU_WINDOW_LOW, 726 encode_cpu_window_low(phys_base, size)); 727 bcm_pcib_set_reg(sc, REG_CPU_WINDOW_START_HIGH, 728 encode_cpu_window_start_high(phys_base)); 729 bcm_pcib_set_reg(sc, REG_CPU_WINDOW_END_HIGH, 730 encode_cpu_window_end_high(phys_base, size)); 731 732 /* 733 * The controller starts up declaring itself an endpoint; readvertise it 734 * as a bridge. 735 */ 736 bcm_pcib_set_reg(sc, PCI_ID_VAL3, 737 PCIC_BRIDGE << CLASS_SHIFT | PCIS_BRIDGE_PCI << SUBCLASS_SHIFT); 738 739 bcm_pcib_set_reg(sc, REG_BRIDGE_SERDES_MODE, 0x2); 740 DELAY(100); 741 742 bcm_pcib_relocate_bridge_window(dev); 743 744 /* Configure interrupts. */ 745 error = bcm_pcib_msi_attach(dev); 746 if (error != 0) 747 return (error); 748 749 /* Done. */ 750 device_add_child(dev, "pci", -1); 751 return (bus_generic_attach(dev)); 752 } 753 754 /* 755 * Device method table. 756 */ 757 static device_method_t bcm_pcib_methods[] = { 758 /* Bus interface. */ 759 DEVMETHOD(bus_get_dma_tag, bcm_pcib_get_dma_tag), 760 761 /* Device interface. */ 762 DEVMETHOD(device_probe, bcm_pcib_probe), 763 DEVMETHOD(device_attach, bcm_pcib_attach), 764 765 /* PCIB interface. */ 766 DEVMETHOD(pcib_read_config, bcm_pcib_read_config), 767 DEVMETHOD(pcib_write_config, bcm_pcib_write_config), 768 769 /* MSI interface. */ 770 DEVMETHOD(msi_alloc_msi, bcm_pcib_alloc_msi), 771 DEVMETHOD(msi_release_msi, bcm_pcib_release_msi), 772 DEVMETHOD(msi_map_msi, bcm_pcib_map_msi), 773 774 DEVMETHOD_END 775 }; 776 777 DEFINE_CLASS_1(pcib, bcm_pcib_driver, bcm_pcib_methods, 778 sizeof(struct bcm_pcib_softc), generic_pcie_fdt_driver); 779 780 DRIVER_MODULE(bcm_pcib, simplebus, bcm_pcib_driver, 0, 0); 781
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