Root/
1 | /* |
2 | * Virtio memory mapped device driver |
3 | * |
4 | * Copyright 2011, 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 | * Registers layout (all 32-bit wide): |
54 | * |
55 | * offset d. name description |
56 | * ------ -- ---------------- ----------------- |
57 | * |
58 | * 0x000 R MagicValue Magic value "virt" |
59 | * 0x004 R Version Device version (current max. 1) |
60 | * 0x008 R DeviceID Virtio device ID |
61 | * 0x00c R VendorID Virtio vendor ID |
62 | * |
63 | * 0x010 R HostFeatures Features supported by the host |
64 | * 0x014 W HostFeaturesSel Set of host features to access via HostFeatures |
65 | * |
66 | * 0x020 W GuestFeatures Features activated by the guest |
67 | * 0x024 W GuestFeaturesSel Set of activated features to set via GuestFeatures |
68 | * 0x028 W GuestPageSize Size of guest's memory page in bytes |
69 | * |
70 | * 0x030 W QueueSel Queue selector |
71 | * 0x034 R QueueNumMax Maximum size of the currently selected queue |
72 | * 0x038 W QueueNum Queue size for the currently selected queue |
73 | * 0x03c W QueueAlign Used Ring alignment for the current queue |
74 | * 0x040 RW QueuePFN PFN for the currently selected queue |
75 | * |
76 | * 0x050 W QueueNotify Queue notifier |
77 | * 0x060 R InterruptStatus Interrupt status register |
78 | * 0x064 W InterruptACK Interrupt acknowledge register |
79 | * 0x070 RW Status Device status register |
80 | * |
81 | * 0x100+ RW Device-specific configuration space |
82 | * |
83 | * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007 |
84 | * |
85 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
86 | * See the COPYING file in the top-level directory. |
87 | */ |
88 | |
89 | #define pr_fmt(fmt) "virtio-mmio: " fmt |
90 | |
91 | #include <linux/highmem.h> |
92 | #include <linux/interrupt.h> |
93 | #include <linux/io.h> |
94 | #include <linux/list.h> |
95 | #include <linux/module.h> |
96 | #include <linux/platform_device.h> |
97 | #include <linux/slab.h> |
98 | #include <linux/spinlock.h> |
99 | #include <linux/virtio.h> |
100 | #include <linux/virtio_config.h> |
101 | #include <linux/virtio_mmio.h> |
102 | #include <linux/virtio_ring.h> |
103 | |
104 | |
105 | |
106 | /* The alignment to use between consumer and producer parts of vring. |
107 | * Currently hardcoded to the page size. */ |
108 | #define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE |
109 | |
110 | |
111 | |
112 | #define to_virtio_mmio_device(_plat_dev) \ |
113 | container_of(_plat_dev, struct virtio_mmio_device, vdev) |
114 | |
115 | struct virtio_mmio_device { |
116 | struct virtio_device vdev; |
117 | struct platform_device *pdev; |
118 | |
119 | void __iomem *base; |
120 | unsigned long version; |
121 | |
122 | /* a list of queues so we can dispatch IRQs */ |
123 | spinlock_t lock; |
124 | struct list_head virtqueues; |
125 | }; |
126 | |
127 | struct virtio_mmio_vq_info { |
128 | /* the actual virtqueue */ |
129 | struct virtqueue *vq; |
130 | |
131 | /* the number of entries in the queue */ |
132 | unsigned int num; |
133 | |
134 | /* the virtual address of the ring queue */ |
135 | void *queue; |
136 | |
137 | /* the list node for the virtqueues list */ |
138 | struct list_head node; |
139 | }; |
140 | |
141 | |
142 | |
143 | /* Configuration interface */ |
144 | |
145 | static u32 vm_get_features(struct virtio_device *vdev) |
146 | { |
147 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
148 | |
149 | /* TODO: Features > 32 bits */ |
150 | writel(0, vm_dev->base + VIRTIO_MMIO_HOST_FEATURES_SEL); |
151 | |
152 | return readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES); |
153 | } |
154 | |
155 | static void vm_finalize_features(struct virtio_device *vdev) |
156 | { |
157 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
158 | int i; |
159 | |
160 | /* Give virtio_ring a chance to accept features. */ |
161 | vring_transport_features(vdev); |
162 | |
163 | for (i = 0; i < ARRAY_SIZE(vdev->features); i++) { |
164 | writel(i, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL); |
165 | writel(vdev->features[i], |
166 | vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES); |
167 | } |
168 | } |
169 | |
170 | static void vm_get(struct virtio_device *vdev, unsigned offset, |
171 | void *buf, unsigned len) |
172 | { |
173 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
174 | u8 *ptr = buf; |
175 | int i; |
176 | |
177 | for (i = 0; i < len; i++) |
178 | ptr[i] = readb(vm_dev->base + VIRTIO_MMIO_CONFIG + offset + i); |
179 | } |
180 | |
181 | static void vm_set(struct virtio_device *vdev, unsigned offset, |
182 | const void *buf, unsigned len) |
183 | { |
184 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
185 | const u8 *ptr = buf; |
186 | int i; |
187 | |
188 | for (i = 0; i < len; i++) |
189 | writeb(ptr[i], vm_dev->base + VIRTIO_MMIO_CONFIG + offset + i); |
190 | } |
191 | |
192 | static u8 vm_get_status(struct virtio_device *vdev) |
193 | { |
194 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
195 | |
196 | return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; |
197 | } |
198 | |
199 | static void vm_set_status(struct virtio_device *vdev, u8 status) |
200 | { |
201 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
202 | |
203 | /* We should never be setting status to 0. */ |
204 | BUG_ON(status == 0); |
205 | |
206 | writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); |
207 | } |
208 | |
209 | static void vm_reset(struct virtio_device *vdev) |
210 | { |
211 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
212 | |
213 | /* 0 status means a reset. */ |
214 | writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); |
215 | } |
216 | |
217 | |
218 | |
219 | /* Transport interface */ |
220 | |
221 | /* the notify function used when creating a virt queue */ |
222 | static void vm_notify(struct virtqueue *vq) |
223 | { |
224 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); |
225 | |
226 | /* We write the queue's selector into the notification register to |
227 | * signal the other end */ |
228 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
229 | } |
230 | |
231 | /* Notify all virtqueues on an interrupt. */ |
232 | static irqreturn_t vm_interrupt(int irq, void *opaque) |
233 | { |
234 | struct virtio_mmio_device *vm_dev = opaque; |
235 | struct virtio_mmio_vq_info *info; |
236 | struct virtio_driver *vdrv = container_of(vm_dev->vdev.dev.driver, |
237 | struct virtio_driver, driver); |
238 | unsigned long status; |
239 | unsigned long flags; |
240 | irqreturn_t ret = IRQ_NONE; |
241 | |
242 | /* Read and acknowledge interrupts */ |
243 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); |
244 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); |
245 | |
246 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG) |
247 | && vdrv && vdrv->config_changed) { |
248 | vdrv->config_changed(&vm_dev->vdev); |
249 | ret = IRQ_HANDLED; |
250 | } |
251 | |
252 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { |
253 | spin_lock_irqsave(&vm_dev->lock, flags); |
254 | list_for_each_entry(info, &vm_dev->virtqueues, node) |
255 | ret |= vring_interrupt(irq, info->vq); |
256 | spin_unlock_irqrestore(&vm_dev->lock, flags); |
257 | } |
258 | |
259 | return ret; |
260 | } |
261 | |
262 | |
263 | |
264 | static void vm_del_vq(struct virtqueue *vq) |
265 | { |
266 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); |
267 | struct virtio_mmio_vq_info *info = vq->priv; |
268 | unsigned long flags, size; |
269 | unsigned int index = vq->index; |
270 | |
271 | spin_lock_irqsave(&vm_dev->lock, flags); |
272 | list_del(&info->node); |
273 | spin_unlock_irqrestore(&vm_dev->lock, flags); |
274 | |
275 | vring_del_virtqueue(vq); |
276 | |
277 | /* Select and deactivate the queue */ |
278 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
279 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
280 | |
281 | size = PAGE_ALIGN(vring_size(info->num, VIRTIO_MMIO_VRING_ALIGN)); |
282 | free_pages_exact(info->queue, size); |
283 | kfree(info); |
284 | } |
285 | |
286 | static void vm_del_vqs(struct virtio_device *vdev) |
287 | { |
288 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
289 | struct virtqueue *vq, *n; |
290 | |
291 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) |
292 | vm_del_vq(vq); |
293 | |
294 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); |
295 | } |
296 | |
297 | |
298 | |
299 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, |
300 | void (*callback)(struct virtqueue *vq), |
301 | const char *name) |
302 | { |
303 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
304 | struct virtio_mmio_vq_info *info; |
305 | struct virtqueue *vq; |
306 | unsigned long flags, size; |
307 | int err; |
308 | |
309 | if (!name) |
310 | return NULL; |
311 | |
312 | /* Select the queue we're interested in */ |
313 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
314 | |
315 | /* Queue shouldn't already be set up. */ |
316 | if (readl(vm_dev->base + VIRTIO_MMIO_QUEUE_PFN)) { |
317 | err = -ENOENT; |
318 | goto error_available; |
319 | } |
320 | |
321 | /* Allocate and fill out our active queue description */ |
322 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
323 | if (!info) { |
324 | err = -ENOMEM; |
325 | goto error_kmalloc; |
326 | } |
327 | |
328 | /* Allocate pages for the queue - start with a queue as big as |
329 | * possible (limited by maximum size allowed by device), drop down |
330 | * to a minimal size, just big enough to fit descriptor table |
331 | * and two rings (which makes it "alignment_size * 2") |
332 | */ |
333 | info->num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); |
334 | |
335 | /* If the device reports a 0 entry queue, we won't be able to |
336 | * use it to perform I/O, and vring_new_virtqueue() can't create |
337 | * empty queues anyway, so don't bother to set up the device. |
338 | */ |
339 | if (info->num == 0) { |
340 | err = -ENOENT; |
341 | goto error_alloc_pages; |
342 | } |
343 | |
344 | while (1) { |
345 | size = PAGE_ALIGN(vring_size(info->num, |
346 | VIRTIO_MMIO_VRING_ALIGN)); |
347 | /* Did the last iter shrink the queue below minimum size? */ |
348 | if (size < VIRTIO_MMIO_VRING_ALIGN * 2) { |
349 | err = -ENOMEM; |
350 | goto error_alloc_pages; |
351 | } |
352 | |
353 | info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); |
354 | if (info->queue) |
355 | break; |
356 | |
357 | info->num /= 2; |
358 | } |
359 | |
360 | /* Activate the queue */ |
361 | writel(info->num, vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); |
362 | writel(VIRTIO_MMIO_VRING_ALIGN, |
363 | vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); |
364 | writel(virt_to_phys(info->queue) >> PAGE_SHIFT, |
365 | vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
366 | |
367 | /* Create the vring */ |
368 | vq = vring_new_virtqueue(index, info->num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
369 | true, info->queue, vm_notify, callback, name); |
370 | if (!vq) { |
371 | err = -ENOMEM; |
372 | goto error_new_virtqueue; |
373 | } |
374 | |
375 | vq->priv = info; |
376 | info->vq = vq; |
377 | |
378 | spin_lock_irqsave(&vm_dev->lock, flags); |
379 | list_add(&info->node, &vm_dev->virtqueues); |
380 | spin_unlock_irqrestore(&vm_dev->lock, flags); |
381 | |
382 | return vq; |
383 | |
384 | error_new_virtqueue: |
385 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
386 | free_pages_exact(info->queue, size); |
387 | error_alloc_pages: |
388 | kfree(info); |
389 | error_kmalloc: |
390 | error_available: |
391 | return ERR_PTR(err); |
392 | } |
393 | |
394 | static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
395 | struct virtqueue *vqs[], |
396 | vq_callback_t *callbacks[], |
397 | const char *names[]) |
398 | { |
399 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
400 | unsigned int irq = platform_get_irq(vm_dev->pdev, 0); |
401 | int i, err; |
402 | |
403 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, |
404 | dev_name(&vdev->dev), vm_dev); |
405 | if (err) |
406 | return err; |
407 | |
408 | for (i = 0; i < nvqs; ++i) { |
409 | vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]); |
410 | if (IS_ERR(vqs[i])) { |
411 | vm_del_vqs(vdev); |
412 | return PTR_ERR(vqs[i]); |
413 | } |
414 | } |
415 | |
416 | return 0; |
417 | } |
418 | |
419 | static const char *vm_bus_name(struct virtio_device *vdev) |
420 | { |
421 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
422 | |
423 | return vm_dev->pdev->name; |
424 | } |
425 | |
426 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
427 | .get = vm_get, |
428 | .set = vm_set, |
429 | .get_status = vm_get_status, |
430 | .set_status = vm_set_status, |
431 | .reset = vm_reset, |
432 | .find_vqs = vm_find_vqs, |
433 | .del_vqs = vm_del_vqs, |
434 | .get_features = vm_get_features, |
435 | .finalize_features = vm_finalize_features, |
436 | .bus_name = vm_bus_name, |
437 | }; |
438 | |
439 | |
440 | |
441 | /* Platform device */ |
442 | |
443 | static int virtio_mmio_probe(struct platform_device *pdev) |
444 | { |
445 | struct virtio_mmio_device *vm_dev; |
446 | struct resource *mem; |
447 | unsigned long magic; |
448 | |
449 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
450 | if (!mem) |
451 | return -EINVAL; |
452 | |
453 | if (!devm_request_mem_region(&pdev->dev, mem->start, |
454 | resource_size(mem), pdev->name)) |
455 | return -EBUSY; |
456 | |
457 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); |
458 | if (!vm_dev) |
459 | return -ENOMEM; |
460 | |
461 | vm_dev->vdev.dev.parent = &pdev->dev; |
462 | vm_dev->vdev.config = &virtio_mmio_config_ops; |
463 | vm_dev->pdev = pdev; |
464 | INIT_LIST_HEAD(&vm_dev->virtqueues); |
465 | spin_lock_init(&vm_dev->lock); |
466 | |
467 | vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); |
468 | if (vm_dev->base == NULL) |
469 | return -EFAULT; |
470 | |
471 | /* Check magic value */ |
472 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); |
473 | if (memcmp(&magic, "virt", 4) != 0) { |
474 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
475 | return -ENODEV; |
476 | } |
477 | |
478 | /* Check device version */ |
479 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); |
480 | if (vm_dev->version != 1) { |
481 | dev_err(&pdev->dev, "Version %ld not supported!\n", |
482 | vm_dev->version); |
483 | return -ENXIO; |
484 | } |
485 | |
486 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); |
487 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
488 | |
489 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); |
490 | |
491 | platform_set_drvdata(pdev, vm_dev); |
492 | |
493 | return register_virtio_device(&vm_dev->vdev); |
494 | } |
495 | |
496 | static int virtio_mmio_remove(struct platform_device *pdev) |
497 | { |
498 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); |
499 | |
500 | unregister_virtio_device(&vm_dev->vdev); |
501 | |
502 | return 0; |
503 | } |
504 | |
505 | |
506 | |
507 | /* Devices list parameter */ |
508 | |
509 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) |
510 | |
511 | static struct device vm_cmdline_parent = { |
512 | .init_name = "virtio-mmio-cmdline", |
513 | }; |
514 | |
515 | static int vm_cmdline_parent_registered; |
516 | static int vm_cmdline_id; |
517 | |
518 | static int vm_cmdline_set(const char *device, |
519 | const struct kernel_param *kp) |
520 | { |
521 | int err; |
522 | struct resource resources[2] = {}; |
523 | char *str; |
524 | long long int base, size; |
525 | unsigned int irq; |
526 | int processed, consumed = 0; |
527 | struct platform_device *pdev; |
528 | |
529 | /* Consume "size" part of the command line parameter */ |
530 | size = memparse(device, &str); |
531 | |
532 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
533 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
534 | &base, &irq, &consumed, |
535 | &vm_cmdline_id, &consumed); |
536 | |
537 | /* |
538 | * sscanf() must processes at least 2 chunks; also there |
539 | * must be no extra characters after the last chunk, so |
540 | * str[consumed] must be '\0' |
541 | */ |
542 | if (processed < 2 || str[consumed]) |
543 | return -EINVAL; |
544 | |
545 | resources[0].flags = IORESOURCE_MEM; |
546 | resources[0].start = base; |
547 | resources[0].end = base + size - 1; |
548 | |
549 | resources[1].flags = IORESOURCE_IRQ; |
550 | resources[1].start = resources[1].end = irq; |
551 | |
552 | if (!vm_cmdline_parent_registered) { |
553 | err = device_register(&vm_cmdline_parent); |
554 | if (err) { |
555 | pr_err("Failed to register parent device!\n"); |
556 | return err; |
557 | } |
558 | vm_cmdline_parent_registered = 1; |
559 | } |
560 | |
561 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", |
562 | vm_cmdline_id, |
563 | (unsigned long long)resources[0].start, |
564 | (unsigned long long)resources[0].end, |
565 | (int)resources[1].start); |
566 | |
567 | pdev = platform_device_register_resndata(&vm_cmdline_parent, |
568 | "virtio-mmio", vm_cmdline_id++, |
569 | resources, ARRAY_SIZE(resources), NULL, 0); |
570 | if (IS_ERR(pdev)) |
571 | return PTR_ERR(pdev); |
572 | |
573 | return 0; |
574 | } |
575 | |
576 | static int vm_cmdline_get_device(struct device *dev, void *data) |
577 | { |
578 | char *buffer = data; |
579 | unsigned int len = strlen(buffer); |
580 | struct platform_device *pdev = to_platform_device(dev); |
581 | |
582 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", |
583 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, |
584 | (unsigned long long)pdev->resource[0].start, |
585 | (unsigned long long)pdev->resource[1].start, |
586 | pdev->id); |
587 | return 0; |
588 | } |
589 | |
590 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) |
591 | { |
592 | buffer[0] = '\0'; |
593 | device_for_each_child(&vm_cmdline_parent, buffer, |
594 | vm_cmdline_get_device); |
595 | return strlen(buffer) + 1; |
596 | } |
597 | |
598 | static struct kernel_param_ops vm_cmdline_param_ops = { |
599 | .set = vm_cmdline_set, |
600 | .get = vm_cmdline_get, |
601 | }; |
602 | |
603 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); |
604 | |
605 | static int vm_unregister_cmdline_device(struct device *dev, |
606 | void *data) |
607 | { |
608 | platform_device_unregister(to_platform_device(dev)); |
609 | |
610 | return 0; |
611 | } |
612 | |
613 | static void vm_unregister_cmdline_devices(void) |
614 | { |
615 | if (vm_cmdline_parent_registered) { |
616 | device_for_each_child(&vm_cmdline_parent, NULL, |
617 | vm_unregister_cmdline_device); |
618 | device_unregister(&vm_cmdline_parent); |
619 | vm_cmdline_parent_registered = 0; |
620 | } |
621 | } |
622 | |
623 | #else |
624 | |
625 | static void vm_unregister_cmdline_devices(void) |
626 | { |
627 | } |
628 | |
629 | #endif |
630 | |
631 | /* Platform driver */ |
632 | |
633 | static struct of_device_id virtio_mmio_match[] = { |
634 | { .compatible = "virtio,mmio", }, |
635 | {}, |
636 | }; |
637 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); |
638 | |
639 | static struct platform_driver virtio_mmio_driver = { |
640 | .probe = virtio_mmio_probe, |
641 | .remove = virtio_mmio_remove, |
642 | .driver = { |
643 | .name = "virtio-mmio", |
644 | .owner = THIS_MODULE, |
645 | .of_match_table = virtio_mmio_match, |
646 | }, |
647 | }; |
648 | |
649 | static int __init virtio_mmio_init(void) |
650 | { |
651 | return platform_driver_register(&virtio_mmio_driver); |
652 | } |
653 | |
654 | static void __exit virtio_mmio_exit(void) |
655 | { |
656 | platform_driver_unregister(&virtio_mmio_driver); |
657 | vm_unregister_cmdline_devices(); |
658 | } |
659 | |
660 | module_init(virtio_mmio_init); |
661 | module_exit(virtio_mmio_exit); |
662 | |
663 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); |
664 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); |
665 | MODULE_LICENSE("GPL"); |
666 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9