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 }; 490 491 492 493 /* Platform device */ 494 495 static int virtio_mmio_probe(struct platform_device *pdev) 496 { 497 struct virtio_mmio_device *vm_dev; 498 struct resource *mem; 499 unsigned long magic; 500 501 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 502 if (!mem) 503 return -EINVAL; 504 505 if (!devm_request_mem_region(&pdev->dev, mem->start, 506 resource_size(mem), pdev->name)) 507 return -EBUSY; 508 509 vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); 510 if (!vm_dev) 511 return -ENOMEM; 512 513 vm_dev->vdev.dev.parent = &pdev->dev; 514 vm_dev->vdev.config = &virtio_mmio_config_ops; 515 vm_dev->pdev = pdev; 516 INIT_LIST_HEAD(&vm_dev->virtqueues); 517 spin_lock_init(&vm_dev->lock); 518 519 vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); 520 if (vm_dev->base == NULL) 521 return -EFAULT; 522 523 /* Check magic value */ 524 magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); 525 if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { 526 dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); 527 return -ENODEV; 528 } 529 530 /* Check device version */ 531 vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); 532 if (vm_dev->version < 1 || vm_dev->version > 2) { 533 dev_err(&pdev->dev, "Version %ld not supported!\n", 534 vm_dev->version); 535 return -ENXIO; 536 } 537 538 vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); 539 if (vm_dev->vdev.id.device == 0) { 540 /* 541 * virtio-mmio device with an ID 0 is a (dummy) placeholder 542 * with no function. End probing now with no error reported. 543 */ 544 return -ENODEV; 545 } 546 vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); 547 548 if (vm_dev->version == 1) 549 writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); 550 551 platform_set_drvdata(pdev, vm_dev); 552 553 return register_virtio_device(&vm_dev->vdev); 554 } 555 556 static int virtio_mmio_remove(struct platform_device *pdev) 557 { 558 struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); 559 560 unregister_virtio_device(&vm_dev->vdev); 561 562 return 0; 563 } 564 565 566 567 /* Devices list parameter */ 568 569 #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) 570 571 static struct device vm_cmdline_parent = { 572 .init_name = "virtio-mmio-cmdline", 573 }; 574 575 static int vm_cmdline_parent_registered; 576 static int vm_cmdline_id; 577 578 static int vm_cmdline_set(const char *device, 579 const struct kernel_param *kp) 580 { 581 int err; 582 struct resource resources[2] = {}; 583 char *str; 584 long long int base, size; 585 unsigned int irq; 586 int processed, consumed = 0; 587 struct platform_device *pdev; 588 589 /* Consume "size" part of the command line parameter */ 590 size = memparse(device, &str); 591 592 /* Get "@<base>:<irq>[:<id>]" chunks */ 593 processed = sscanf(str, "@%lli:%u%n:%d%n", 594 &base, &irq, &consumed, 595 &vm_cmdline_id, &consumed); 596 597 /* 598 * sscanf() must processes at least 2 chunks; also there 599 * must be no extra characters after the last chunk, so 600 * str[consumed] must be '\0' 601 */ 602 if (processed < 2 || str[consumed]) 603 return -EINVAL; 604 605 resources[0].flags = IORESOURCE_MEM; 606 resources[0].start = base; 607 resources[0].end = base + size - 1; 608 609 resources[1].flags = IORESOURCE_IRQ; 610 resources[1].start = resources[1].end = irq; 611 612 if (!vm_cmdline_parent_registered) { 613 err = device_register(&vm_cmdline_parent); 614 if (err) { 615 pr_err("Failed to register parent device!\n"); 616 return err; 617 } 618 vm_cmdline_parent_registered = 1; 619 } 620 621 pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", 622 vm_cmdline_id, 623 (unsigned long long)resources[0].start, 624 (unsigned long long)resources[0].end, 625 (int)resources[1].start); 626 627 pdev = platform_device_register_resndata(&vm_cmdline_parent, 628 "virtio-mmio", vm_cmdline_id++, 629 resources, ARRAY_SIZE(resources), NULL, 0); 630 if (IS_ERR(pdev)) 631 return PTR_ERR(pdev); 632 633 return 0; 634 } 635 636 static int vm_cmdline_get_device(struct device *dev, void *data) 637 { 638 char *buffer = data; 639 unsigned int len = strlen(buffer); 640 struct platform_device *pdev = to_platform_device(dev); 641 642 snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", 643 pdev->resource[0].end - pdev->resource[0].start + 1ULL, 644 (unsigned long long)pdev->resource[0].start, 645 (unsigned long long)pdev->resource[1].start, 646 pdev->id); 647 return 0; 648 } 649 650 static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) 651 { 652 buffer[0] = '\0'; 653 device_for_each_child(&vm_cmdline_parent, buffer, 654 vm_cmdline_get_device); 655 return strlen(buffer) + 1; 656 } 657 658 static const struct kernel_param_ops vm_cmdline_param_ops = { 659 .set = vm_cmdline_set, 660 .get = vm_cmdline_get, 661 }; 662 663 device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); 664 665 static int vm_unregister_cmdline_device(struct device *dev, 666 void *data) 667 { 668 platform_device_unregister(to_platform_device(dev)); 669 670 return 0; 671 } 672 673 static void vm_unregister_cmdline_devices(void) 674 { 675 if (vm_cmdline_parent_registered) { 676 device_for_each_child(&vm_cmdline_parent, NULL, 677 vm_unregister_cmdline_device); 678 device_unregister(&vm_cmdline_parent); 679 vm_cmdline_parent_registered = 0; 680 } 681 } 682 683 #else 684 685 static void vm_unregister_cmdline_devices(void) 686 { 687 } 688 689 #endif 690 691 /* Platform driver */ 692 693 static struct of_device_id virtio_mmio_match[] = { 694 { .compatible = "virtio,mmio", }, 695 {}, 696 }; 697 MODULE_DEVICE_TABLE(of, virtio_mmio_match); 698 699 #ifdef CONFIG_ACPI 700 static const struct acpi_device_id virtio_mmio_acpi_match[] = { 701 { "LNRO0005", }, 702 { } 703 }; 704 MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); 705 #endif 706 707 static struct platform_driver virtio_mmio_driver = { 708 .probe = virtio_mmio_probe, 709 .remove = virtio_mmio_remove, 710 .driver = { 711 .name = "virtio-mmio", 712 .of_match_table = virtio_mmio_match, 713 .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), 714 }, 715 }; 716 717 static int __init virtio_mmio_init(void) 718 { 719 return platform_driver_register(&virtio_mmio_driver); 720 } 721 722 static void __exit virtio_mmio_exit(void) 723 { 724 platform_driver_unregister(&virtio_mmio_driver); 725 vm_unregister_cmdline_devices(); 726 } 727 728 module_init(virtio_mmio_init); 729 module_exit(virtio_mmio_exit); 730 731 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); 732 MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); 733 MODULE_LICENSE("GPL"); 734