1 /* 2 * Virtio memory mapped device driver 3 * 4 * Copyright 2011-2014, ARM Ltd. 5 * 6 * This module allows virtio devices to be used over a virtual, memory mapped 7 * platform device. 8 * 9 * The guest device(s) may be instantiated in one of three equivalent ways: 10 * 11 * 1. Static platform device in board's code, eg.: 12 * 13 * static struct platform_device v2m_virtio_device = { 14 * .name = "virtio-mmio", 15 * .id = -1, 16 * .num_resources = 2, 17 * .resource = (struct resource []) { 18 * { 19 * .start = 0x1001e000, 20 * .end = 0x1001e0ff, 21 * .flags = IORESOURCE_MEM, 22 * }, { 23 * .start = 42 + 32, 24 * .end = 42 + 32, 25 * .flags = IORESOURCE_IRQ, 26 * }, 27 * } 28 * }; 29 * 30 * 2. Device Tree node, eg.: 31 * 32 * virtio_block@1e000 { 33 * compatible = "virtio,mmio"; 34 * reg = <0x1e000 0x100>; 35 * interrupts = <42>; 36 * } 37 * 38 * 3. Kernel module (or command line) parameter. Can be used more than once - 39 * one device will be created for each one. Syntax: 40 * 41 * [virtio_mmio.]device=<size>@<baseaddr>:<irq>[:<id>] 42 * where: 43 * <size> := size (can use standard suffixes like K, M or G) 44 * <baseaddr> := physical base address 45 * <irq> := interrupt number (as passed to request_irq()) 46 * <id> := (optional) platform device id 47 * eg.: 48 * virtio_mmio.device=0x100@0x100b0000:48 \ 49 * virtio_mmio.device=1K@0x1001e000:74 50 * 51 * 52 * 53 * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007 54 * 55 * This work is licensed under the terms of the GNU GPL, version 2 or later. 56 * See the COPYING file in the top-level directory. 57 */ 58 59 #define pr_fmt(fmt) "virtio-mmio: " fmt 60 61 #include <linux/acpi.h> 62 #include <linux/highmem.h> 63 #include <linux/interrupt.h> 64 #include <linux/io.h> 65 #include <linux/list.h> 66 #include <linux/module.h> 67 #include <linux/platform_device.h> 68 #include <linux/slab.h> 69 #include <linux/spinlock.h> 70 #include <linux/virtio.h> 71 #include <linux/virtio_config.h> 72 #include <linux/virtio_mmio.h> 73 #include <linux/virtio_ring.h> 74 75 76 77 /* The alignment to use between consumer and producer parts of vring. 78 * Currently hardcoded to the page size. */ 79 #define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE 80 81 82 83 #define to_virtio_mmio_device(_plat_dev) \ 84 container_of(_plat_dev, struct virtio_mmio_device, vdev) 85 86 struct virtio_mmio_device { 87 struct virtio_device vdev; 88 struct platform_device *pdev; 89 90 void __iomem *base; 91 unsigned long version; 92 93 /* a list of queues so we can dispatch IRQs */ 94 spinlock_t lock; 95 struct list_head virtqueues; 96 }; 97 98 struct virtio_mmio_vq_info { 99 /* the actual virtqueue */ 100 struct virtqueue *vq; 101 102 /* the list node for the virtqueues list */ 103 struct list_head node; 104 }; 105 106 107 108 /* Configuration interface */ 109 110 static u64 vm_get_features(struct virtio_device *vdev) 111 { 112 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 113 u64 features; 114 115 writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); 116 features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); 117 features <<= 32; 118 119 writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); 120 features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); 121 122 return features; 123 } 124 125 static int vm_finalize_features(struct virtio_device *vdev) 126 { 127 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 128 129 /* Give virtio_ring a chance to accept features. */ 130 vring_transport_features(vdev); 131 132 /* Make sure there is are no mixed devices */ 133 if (vm_dev->version == 2 && 134 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 135 dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); 136 return -EINVAL; 137 } 138 139 writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); 140 writel((u32)(vdev->features >> 32), 141 vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); 142 143 writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); 144 writel((u32)vdev->features, 145 vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); 146 147 return 0; 148 } 149 150 static void vm_get(struct virtio_device *vdev, unsigned offset, 151 void *buf, unsigned len) 152 { 153 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 154 void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; 155 u8 b; 156 __le16 w; 157 __le32 l; 158 159 if (vm_dev->version == 1) { 160 u8 *ptr = buf; 161 int i; 162 163 for (i = 0; i < len; i++) 164 ptr[i] = readb(base + offset + i); 165 return; 166 } 167 168 switch (len) { 169 case 1: 170 b = readb(base + offset); 171 memcpy(buf, &b, sizeof b); 172 break; 173 case 2: 174 w = cpu_to_le16(readw(base + offset)); 175 memcpy(buf, &w, sizeof w); 176 break; 177 case 4: 178 l = cpu_to_le32(readl(base + offset)); 179 memcpy(buf, &l, sizeof l); 180 break; 181 case 8: 182 l = cpu_to_le32(readl(base + offset)); 183 memcpy(buf, &l, sizeof l); 184 l = cpu_to_le32(ioread32(base + offset + sizeof l)); 185 memcpy(buf + sizeof l, &l, sizeof l); 186 break; 187 default: 188 BUG(); 189 } 190 } 191 192 static void vm_set(struct virtio_device *vdev, unsigned offset, 193 const void *buf, unsigned len) 194 { 195 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 196 void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; 197 u8 b; 198 __le16 w; 199 __le32 l; 200 201 if (vm_dev->version == 1) { 202 const u8 *ptr = buf; 203 int i; 204 205 for (i = 0; i < len; i++) 206 writeb(ptr[i], base + offset + i); 207 208 return; 209 } 210 211 switch (len) { 212 case 1: 213 memcpy(&b, buf, sizeof b); 214 writeb(b, base + offset); 215 break; 216 case 2: 217 memcpy(&w, buf, sizeof w); 218 writew(le16_to_cpu(w), base + offset); 219 break; 220 case 4: 221 memcpy(&l, buf, sizeof l); 222 writel(le32_to_cpu(l), base + offset); 223 break; 224 case 8: 225 memcpy(&l, buf, sizeof l); 226 writel(le32_to_cpu(l), base + offset); 227 memcpy(&l, buf + sizeof l, sizeof l); 228 writel(le32_to_cpu(l), base + offset + sizeof l); 229 break; 230 default: 231 BUG(); 232 } 233 } 234 235 static u32 vm_generation(struct virtio_device *vdev) 236 { 237 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 238 239 if (vm_dev->version == 1) 240 return 0; 241 else 242 return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); 243 } 244 245 static u8 vm_get_status(struct virtio_device *vdev) 246 { 247 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 248 249 return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; 250 } 251 252 static void vm_set_status(struct virtio_device *vdev, u8 status) 253 { 254 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 255 256 /* We should never be setting status to 0. */ 257 BUG_ON(status == 0); 258 259 writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); 260 } 261 262 static void vm_reset(struct virtio_device *vdev) 263 { 264 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 265 266 /* 0 status means a reset. */ 267 writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); 268 } 269 270 271 272 /* Transport interface */ 273 274 /* the notify function used when creating a virt queue */ 275 static bool vm_notify(struct virtqueue *vq) 276 { 277 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); 278 279 /* We write the queue's selector into the notification register to 280 * signal the other end */ 281 writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); 282 return true; 283 } 284 285 /* Notify all virtqueues on an interrupt. */ 286 static irqreturn_t vm_interrupt(int irq, void *opaque) 287 { 288 struct virtio_mmio_device *vm_dev = opaque; 289 struct virtio_mmio_vq_info *info; 290 unsigned long status; 291 unsigned long flags; 292 irqreturn_t ret = IRQ_NONE; 293 294 /* Read and acknowledge interrupts */ 295 status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); 296 writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); 297 298 if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { 299 virtio_config_changed(&vm_dev->vdev); 300 ret = IRQ_HANDLED; 301 } 302 303 if (likely(status & VIRTIO_MMIO_INT_VRING)) { 304 spin_lock_irqsave(&vm_dev->lock, flags); 305 list_for_each_entry(info, &vm_dev->virtqueues, node) 306 ret |= vring_interrupt(irq, info->vq); 307 spin_unlock_irqrestore(&vm_dev->lock, flags); 308 } 309 310 return ret; 311 } 312 313 314 315 static void vm_del_vq(struct virtqueue *vq) 316 { 317 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); 318 struct virtio_mmio_vq_info *info = vq->priv; 319 unsigned long flags; 320 unsigned int index = vq->index; 321 322 spin_lock_irqsave(&vm_dev->lock, flags); 323 list_del(&info->node); 324 spin_unlock_irqrestore(&vm_dev->lock, flags); 325 326 /* Select and deactivate the queue */ 327 writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); 328 if (vm_dev->version == 1) { 329 writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); 330 } else { 331 writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); 332 WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); 333 } 334 335 vring_del_virtqueue(vq); 336 337 kfree(info); 338 } 339 340 static void vm_del_vqs(struct virtio_device *vdev) 341 { 342 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 343 struct virtqueue *vq, *n; 344 345 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 346 vm_del_vq(vq); 347 348 free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); 349 } 350 351 static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, 352 void (*callback)(struct virtqueue *vq), 353 const char *name) 354 { 355 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 356 struct virtio_mmio_vq_info *info; 357 struct virtqueue *vq; 358 unsigned long flags; 359 unsigned int num; 360 int err; 361 362 if (!name) 363 return NULL; 364 365 /* Select the queue we're interested in */ 366 writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); 367 368 /* Queue shouldn't already be set up. */ 369 if (readl(vm_dev->base + (vm_dev->version == 1 ? 370 VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { 371 err = -ENOENT; 372 goto error_available; 373 } 374 375 /* Allocate and fill out our active queue description */ 376 info = kmalloc(sizeof(*info), GFP_KERNEL); 377 if (!info) { 378 err = -ENOMEM; 379 goto error_kmalloc; 380 } 381 382 num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); 383 if (num == 0) { 384 err = -ENOENT; 385 goto error_new_virtqueue; 386 } 387 388 /* Create the vring */ 389 vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev, 390 true, true, vm_notify, callback, name); 391 if (!vq) { 392 err = -ENOMEM; 393 goto error_new_virtqueue; 394 } 395 396 /* Activate the queue */ 397 writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); 398 if (vm_dev->version == 1) { 399 writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); 400 writel(virtqueue_get_desc_addr(vq) >> PAGE_SHIFT, 401 vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); 402 } else { 403 u64 addr; 404 405 addr = virtqueue_get_desc_addr(vq); 406 writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); 407 writel((u32)(addr >> 32), 408 vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); 409 410 addr = virtqueue_get_avail_addr(vq); 411 writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); 412 writel((u32)(addr >> 32), 413 vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); 414 415 addr = virtqueue_get_used_addr(vq); 416 writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); 417 writel((u32)(addr >> 32), 418 vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); 419 420 writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); 421 } 422 423 vq->priv = info; 424 info->vq = vq; 425 426 spin_lock_irqsave(&vm_dev->lock, flags); 427 list_add(&info->node, &vm_dev->virtqueues); 428 spin_unlock_irqrestore(&vm_dev->lock, flags); 429 430 return vq; 431 432 error_new_virtqueue: 433 if (vm_dev->version == 1) { 434 writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); 435 } else { 436 writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); 437 WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); 438 } 439 kfree(info); 440 error_kmalloc: 441 error_available: 442 return ERR_PTR(err); 443 } 444 445 static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, 446 struct virtqueue *vqs[], 447 vq_callback_t *callbacks[], 448 const char * const names[]) 449 { 450 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 451 unsigned int irq = platform_get_irq(vm_dev->pdev, 0); 452 int i, err; 453 454 err = request_irq(irq, vm_interrupt, IRQF_SHARED, 455 dev_name(&vdev->dev), vm_dev); 456 if (err) 457 return err; 458 459 for (i = 0; i < nvqs; ++i) { 460 vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]); 461 if (IS_ERR(vqs[i])) { 462 vm_del_vqs(vdev); 463 return PTR_ERR(vqs[i]); 464 } 465 } 466 467 return 0; 468 } 469 470 static const char *vm_bus_name(struct virtio_device *vdev) 471 { 472 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); 473 474 return vm_dev->pdev->name; 475 } 476 477 static const struct virtio_config_ops virtio_mmio_config_ops = { 478 .get = vm_get, 479 .set = vm_set, 480 .generation = vm_generation, 481 .get_status = vm_get_status, 482 .set_status = vm_set_status, 483 .reset = vm_reset, 484 .find_vqs = vm_find_vqs, 485 .del_vqs = vm_del_vqs, 486 .get_features = vm_get_features, 487 .finalize_features = vm_finalize_features, 488 .bus_name = vm_bus_name, 489 }; 490 491 492 static void virtio_mmio_release_dev_empty(struct device *_d) {} 493 494 /* Platform device */ 495 496 static int virtio_mmio_probe(struct platform_device *pdev) 497 { 498 struct virtio_mmio_device *vm_dev; 499 struct resource *mem; 500 unsigned long magic; 501 502 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 503 if (!mem) 504 return -EINVAL; 505 506 if (!devm_request_mem_region(&pdev->dev, mem->start, 507 resource_size(mem), pdev->name)) 508 return -EBUSY; 509 510 vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); 511 if (!vm_dev) 512 return -ENOMEM; 513 514 vm_dev->vdev.dev.parent = &pdev->dev; 515 vm_dev->vdev.dev.release = virtio_mmio_release_dev_empty; 516 vm_dev->vdev.config = &virtio_mmio_config_ops; 517 vm_dev->pdev = pdev; 518 INIT_LIST_HEAD(&vm_dev->virtqueues); 519 spin_lock_init(&vm_dev->lock); 520 521 vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); 522 if (vm_dev->base == NULL) 523 return -EFAULT; 524 525 /* Check magic value */ 526 magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); 527 if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { 528 dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); 529 return -ENODEV; 530 } 531 532 /* Check device version */ 533 vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); 534 if (vm_dev->version < 1 || vm_dev->version > 2) { 535 dev_err(&pdev->dev, "Version %ld not supported!\n", 536 vm_dev->version); 537 return -ENXIO; 538 } 539 540 vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); 541 if (vm_dev->vdev.id.device == 0) { 542 /* 543 * virtio-mmio device with an ID 0 is a (dummy) placeholder 544 * with no function. End probing now with no error reported. 545 */ 546 return -ENODEV; 547 } 548 vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); 549 550 if (vm_dev->version == 1) 551 writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); 552 553 platform_set_drvdata(pdev, vm_dev); 554 555 return register_virtio_device(&vm_dev->vdev); 556 } 557 558 static int virtio_mmio_remove(struct platform_device *pdev) 559 { 560 struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); 561 562 unregister_virtio_device(&vm_dev->vdev); 563 564 return 0; 565 } 566 567 568 569 /* Devices list parameter */ 570 571 #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) 572 573 static struct device vm_cmdline_parent = { 574 .init_name = "virtio-mmio-cmdline", 575 }; 576 577 static int vm_cmdline_parent_registered; 578 static int vm_cmdline_id; 579 580 static int vm_cmdline_set(const char *device, 581 const struct kernel_param *kp) 582 { 583 int err; 584 struct resource resources[2] = {}; 585 char *str; 586 long long int base, size; 587 unsigned int irq; 588 int processed, consumed = 0; 589 struct platform_device *pdev; 590 591 /* Consume "size" part of the command line parameter */ 592 size = memparse(device, &str); 593 594 /* Get "@<base>:<irq>[:<id>]" chunks */ 595 processed = sscanf(str, "@%lli:%u%n:%d%n", 596 &base, &irq, &consumed, 597 &vm_cmdline_id, &consumed); 598 599 /* 600 * sscanf() must processes at least 2 chunks; also there 601 * must be no extra characters after the last chunk, so 602 * str[consumed] must be '\0' 603 */ 604 if (processed < 2 || str[consumed]) 605 return -EINVAL; 606 607 resources[0].flags = IORESOURCE_MEM; 608 resources[0].start = base; 609 resources[0].end = base + size - 1; 610 611 resources[1].flags = IORESOURCE_IRQ; 612 resources[1].start = resources[1].end = irq; 613 614 if (!vm_cmdline_parent_registered) { 615 err = device_register(&vm_cmdline_parent); 616 if (err) { 617 pr_err("Failed to register parent device!\n"); 618 return err; 619 } 620 vm_cmdline_parent_registered = 1; 621 } 622 623 pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", 624 vm_cmdline_id, 625 (unsigned long long)resources[0].start, 626 (unsigned long long)resources[0].end, 627 (int)resources[1].start); 628 629 pdev = platform_device_register_resndata(&vm_cmdline_parent, 630 "virtio-mmio", vm_cmdline_id++, 631 resources, ARRAY_SIZE(resources), NULL, 0); 632 if (IS_ERR(pdev)) 633 return PTR_ERR(pdev); 634 635 return 0; 636 } 637 638 static int vm_cmdline_get_device(struct device *dev, void *data) 639 { 640 char *buffer = data; 641 unsigned int len = strlen(buffer); 642 struct platform_device *pdev = to_platform_device(dev); 643 644 snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", 645 pdev->resource[0].end - pdev->resource[0].start + 1ULL, 646 (unsigned long long)pdev->resource[0].start, 647 (unsigned long long)pdev->resource[1].start, 648 pdev->id); 649 return 0; 650 } 651 652 static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) 653 { 654 buffer[0] = '\0'; 655 device_for_each_child(&vm_cmdline_parent, buffer, 656 vm_cmdline_get_device); 657 return strlen(buffer) + 1; 658 } 659 660 static const struct kernel_param_ops vm_cmdline_param_ops = { 661 .set = vm_cmdline_set, 662 .get = vm_cmdline_get, 663 }; 664 665 device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); 666 667 static int vm_unregister_cmdline_device(struct device *dev, 668 void *data) 669 { 670 platform_device_unregister(to_platform_device(dev)); 671 672 return 0; 673 } 674 675 static void vm_unregister_cmdline_devices(void) 676 { 677 if (vm_cmdline_parent_registered) { 678 device_for_each_child(&vm_cmdline_parent, NULL, 679 vm_unregister_cmdline_device); 680 device_unregister(&vm_cmdline_parent); 681 vm_cmdline_parent_registered = 0; 682 } 683 } 684 685 #else 686 687 static void vm_unregister_cmdline_devices(void) 688 { 689 } 690 691 #endif 692 693 /* Platform driver */ 694 695 static struct of_device_id virtio_mmio_match[] = { 696 { .compatible = "virtio,mmio", }, 697 {}, 698 }; 699 MODULE_DEVICE_TABLE(of, virtio_mmio_match); 700 701 #ifdef CONFIG_ACPI 702 static const struct acpi_device_id virtio_mmio_acpi_match[] = { 703 { "LNRO0005", }, 704 { } 705 }; 706 MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); 707 #endif 708 709 static struct platform_driver virtio_mmio_driver = { 710 .probe = virtio_mmio_probe, 711 .remove = virtio_mmio_remove, 712 .driver = { 713 .name = "virtio-mmio", 714 .of_match_table = virtio_mmio_match, 715 .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), 716 }, 717 }; 718 719 static int __init virtio_mmio_init(void) 720 { 721 return platform_driver_register(&virtio_mmio_driver); 722 } 723 724 static void __exit virtio_mmio_exit(void) 725 { 726 platform_driver_unregister(&virtio_mmio_driver); 727 vm_unregister_cmdline_devices(); 728 } 729 730 module_init(virtio_mmio_init); 731 module_exit(virtio_mmio_exit); 732 733 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); 734 MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); 735 MODULE_LICENSE("GPL"); 736