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mm: vma_adjust: remove superfluous check for next not NULL
[linux/fpc-iii.git] / drivers / virtio / virtio_mmio.c
blob48bfea91dbcac96c3265f5a652b616b96d06b707
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");
Linux with added FPC-III support