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edfd52e6 PM |
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 | * | |
81a054ce PM |
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 | * | |
edfd52e6 PM |
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 | |
0d34cc2d | 78 | * 0x064 W InterruptACK Interrupt acknowledge register |
edfd52e6 PM |
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 | ||
81a054ce PM |
89 | #define pr_fmt(fmt) "virtio-mmio: " fmt |
90 | ||
edfd52e6 PM |
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 | ||
edfd52e6 PM |
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++) { | |
fe1a7fe2 | 164 | writel(i, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL); |
edfd52e6 PM |
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 */ | |
46f9c2b9 | 222 | static bool vm_notify(struct virtqueue *vq) |
edfd52e6 PM |
223 | { |
224 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
edfd52e6 PM |
225 | |
226 | /* We write the queue's selector into the notification register to | |
227 | * signal the other end */ | |
06ca287d | 228 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
46f9c2b9 | 229 | return true; |
edfd52e6 PM |
230 | } |
231 | ||
232 | /* Notify all virtqueues on an interrupt. */ | |
233 | static irqreturn_t vm_interrupt(int irq, void *opaque) | |
234 | { | |
235 | struct virtio_mmio_device *vm_dev = opaque; | |
236 | struct virtio_mmio_vq_info *info; | |
237 | struct virtio_driver *vdrv = container_of(vm_dev->vdev.dev.driver, | |
238 | struct virtio_driver, driver); | |
239 | unsigned long status; | |
240 | unsigned long flags; | |
241 | irqreturn_t ret = IRQ_NONE; | |
242 | ||
243 | /* Read and acknowledge interrupts */ | |
244 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); | |
245 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); | |
246 | ||
247 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG) | |
248 | && vdrv && vdrv->config_changed) { | |
249 | vdrv->config_changed(&vm_dev->vdev); | |
250 | ret = IRQ_HANDLED; | |
251 | } | |
252 | ||
253 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { | |
254 | spin_lock_irqsave(&vm_dev->lock, flags); | |
255 | list_for_each_entry(info, &vm_dev->virtqueues, node) | |
256 | ret |= vring_interrupt(irq, info->vq); | |
257 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
258 | } | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | ||
264 | ||
265 | static void vm_del_vq(struct virtqueue *vq) | |
266 | { | |
267 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
268 | struct virtio_mmio_vq_info *info = vq->priv; | |
269 | unsigned long flags, size; | |
06ca287d | 270 | unsigned int index = vq->index; |
edfd52e6 PM |
271 | |
272 | spin_lock_irqsave(&vm_dev->lock, flags); | |
273 | list_del(&info->node); | |
274 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
275 | ||
276 | vring_del_virtqueue(vq); | |
277 | ||
278 | /* Select and deactivate the queue */ | |
17bb6d40 | 279 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
edfd52e6 PM |
280 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
281 | ||
282 | size = PAGE_ALIGN(vring_size(info->num, VIRTIO_MMIO_VRING_ALIGN)); | |
283 | free_pages_exact(info->queue, size); | |
284 | kfree(info); | |
285 | } | |
286 | ||
287 | static void vm_del_vqs(struct virtio_device *vdev) | |
288 | { | |
289 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
290 | struct virtqueue *vq, *n; | |
291 | ||
292 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
293 | vm_del_vq(vq); | |
294 | ||
295 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); | |
296 | } | |
297 | ||
298 | ||
299 | ||
300 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, | |
301 | void (*callback)(struct virtqueue *vq), | |
302 | const char *name) | |
303 | { | |
304 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
305 | struct virtio_mmio_vq_info *info; | |
306 | struct virtqueue *vq; | |
307 | unsigned long flags, size; | |
308 | int err; | |
309 | ||
6457f126 MT |
310 | if (!name) |
311 | return NULL; | |
312 | ||
edfd52e6 PM |
313 | /* Select the queue we're interested in */ |
314 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); | |
315 | ||
316 | /* Queue shouldn't already be set up. */ | |
317 | if (readl(vm_dev->base + VIRTIO_MMIO_QUEUE_PFN)) { | |
318 | err = -ENOENT; | |
319 | goto error_available; | |
320 | } | |
321 | ||
322 | /* Allocate and fill out our active queue description */ | |
323 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
324 | if (!info) { | |
325 | err = -ENOMEM; | |
326 | goto error_kmalloc; | |
327 | } | |
edfd52e6 PM |
328 | |
329 | /* Allocate pages for the queue - start with a queue as big as | |
330 | * possible (limited by maximum size allowed by device), drop down | |
331 | * to a minimal size, just big enough to fit descriptor table | |
332 | * and two rings (which makes it "alignment_size * 2") | |
333 | */ | |
334 | info->num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); | |
d78b519f BF |
335 | |
336 | /* If the device reports a 0 entry queue, we won't be able to | |
337 | * use it to perform I/O, and vring_new_virtqueue() can't create | |
338 | * empty queues anyway, so don't bother to set up the device. | |
339 | */ | |
340 | if (info->num == 0) { | |
341 | err = -ENOENT; | |
342 | goto error_alloc_pages; | |
343 | } | |
344 | ||
edfd52e6 PM |
345 | while (1) { |
346 | size = PAGE_ALIGN(vring_size(info->num, | |
347 | VIRTIO_MMIO_VRING_ALIGN)); | |
3850d29f BF |
348 | /* Did the last iter shrink the queue below minimum size? */ |
349 | if (size < VIRTIO_MMIO_VRING_ALIGN * 2) { | |
edfd52e6 PM |
350 | err = -ENOMEM; |
351 | goto error_alloc_pages; | |
352 | } | |
353 | ||
354 | info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); | |
355 | if (info->queue) | |
356 | break; | |
357 | ||
358 | info->num /= 2; | |
359 | } | |
360 | ||
361 | /* Activate the queue */ | |
362 | writel(info->num, vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); | |
363 | writel(VIRTIO_MMIO_VRING_ALIGN, | |
364 | vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); | |
365 | writel(virt_to_phys(info->queue) >> PAGE_SHIFT, | |
366 | vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
367 | ||
368 | /* Create the vring */ | |
17bb6d40 | 369 | vq = vring_new_virtqueue(index, info->num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
7b21e34f | 370 | true, info->queue, vm_notify, callback, name); |
edfd52e6 PM |
371 | if (!vq) { |
372 | err = -ENOMEM; | |
373 | goto error_new_virtqueue; | |
374 | } | |
375 | ||
376 | vq->priv = info; | |
377 | info->vq = vq; | |
378 | ||
379 | spin_lock_irqsave(&vm_dev->lock, flags); | |
380 | list_add(&info->node, &vm_dev->virtqueues); | |
381 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
382 | ||
383 | return vq; | |
384 | ||
385 | error_new_virtqueue: | |
386 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
387 | free_pages_exact(info->queue, size); | |
388 | error_alloc_pages: | |
389 | kfree(info); | |
390 | error_kmalloc: | |
391 | error_available: | |
392 | return ERR_PTR(err); | |
393 | } | |
394 | ||
395 | static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, | |
396 | struct virtqueue *vqs[], | |
397 | vq_callback_t *callbacks[], | |
398 | const char *names[]) | |
399 | { | |
400 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
401 | unsigned int irq = platform_get_irq(vm_dev->pdev, 0); | |
402 | int i, err; | |
403 | ||
404 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, | |
405 | dev_name(&vdev->dev), vm_dev); | |
406 | if (err) | |
407 | return err; | |
408 | ||
409 | for (i = 0; i < nvqs; ++i) { | |
410 | vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]); | |
411 | if (IS_ERR(vqs[i])) { | |
412 | vm_del_vqs(vdev); | |
413 | return PTR_ERR(vqs[i]); | |
414 | } | |
415 | } | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
66846048 RJ |
420 | static const char *vm_bus_name(struct virtio_device *vdev) |
421 | { | |
422 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 | 423 | |
66846048 RJ |
424 | return vm_dev->pdev->name; |
425 | } | |
edfd52e6 | 426 | |
93503932 | 427 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
edfd52e6 PM |
428 | .get = vm_get, |
429 | .set = vm_set, | |
430 | .get_status = vm_get_status, | |
431 | .set_status = vm_set_status, | |
432 | .reset = vm_reset, | |
433 | .find_vqs = vm_find_vqs, | |
434 | .del_vqs = vm_del_vqs, | |
435 | .get_features = vm_get_features, | |
436 | .finalize_features = vm_finalize_features, | |
66846048 | 437 | .bus_name = vm_bus_name, |
edfd52e6 PM |
438 | }; |
439 | ||
440 | ||
441 | ||
442 | /* Platform device */ | |
443 | ||
8590dbc7 | 444 | static int virtio_mmio_probe(struct platform_device *pdev) |
edfd52e6 PM |
445 | { |
446 | struct virtio_mmio_device *vm_dev; | |
447 | struct resource *mem; | |
448 | unsigned long magic; | |
449 | ||
450 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
451 | if (!mem) | |
452 | return -EINVAL; | |
453 | ||
454 | if (!devm_request_mem_region(&pdev->dev, mem->start, | |
455 | resource_size(mem), pdev->name)) | |
456 | return -EBUSY; | |
457 | ||
458 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); | |
459 | if (!vm_dev) | |
460 | return -ENOMEM; | |
461 | ||
462 | vm_dev->vdev.dev.parent = &pdev->dev; | |
463 | vm_dev->vdev.config = &virtio_mmio_config_ops; | |
464 | vm_dev->pdev = pdev; | |
465 | INIT_LIST_HEAD(&vm_dev->virtqueues); | |
466 | spin_lock_init(&vm_dev->lock); | |
467 | ||
468 | vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); | |
469 | if (vm_dev->base == NULL) | |
470 | return -EFAULT; | |
471 | ||
472 | /* Check magic value */ | |
473 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); | |
4ae85370 | 474 | if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
edfd52e6 PM |
475 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
476 | return -ENODEV; | |
477 | } | |
478 | ||
479 | /* Check device version */ | |
480 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); | |
481 | if (vm_dev->version != 1) { | |
482 | dev_err(&pdev->dev, "Version %ld not supported!\n", | |
483 | vm_dev->version); | |
484 | return -ENXIO; | |
485 | } | |
486 | ||
487 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); | |
488 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); | |
489 | ||
490 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); | |
491 | ||
492 | platform_set_drvdata(pdev, vm_dev); | |
493 | ||
494 | return register_virtio_device(&vm_dev->vdev); | |
495 | } | |
496 | ||
8590dbc7 | 497 | static int virtio_mmio_remove(struct platform_device *pdev) |
edfd52e6 PM |
498 | { |
499 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); | |
500 | ||
501 | unregister_virtio_device(&vm_dev->vdev); | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | ||
507 | ||
81a054ce PM |
508 | /* Devices list parameter */ |
509 | ||
510 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) | |
511 | ||
512 | static struct device vm_cmdline_parent = { | |
513 | .init_name = "virtio-mmio-cmdline", | |
514 | }; | |
515 | ||
516 | static int vm_cmdline_parent_registered; | |
517 | static int vm_cmdline_id; | |
518 | ||
519 | static int vm_cmdline_set(const char *device, | |
520 | const struct kernel_param *kp) | |
521 | { | |
522 | int err; | |
523 | struct resource resources[2] = {}; | |
524 | char *str; | |
40f9938c PM |
525 | long long int base, size; |
526 | unsigned int irq; | |
81a054ce PM |
527 | int processed, consumed = 0; |
528 | struct platform_device *pdev; | |
529 | ||
40f9938c PM |
530 | /* Consume "size" part of the command line parameter */ |
531 | size = memparse(device, &str); | |
81a054ce | 532 | |
40f9938c | 533 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
81a054ce | 534 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
40f9938c | 535 | &base, &irq, &consumed, |
81a054ce PM |
536 | &vm_cmdline_id, &consumed); |
537 | ||
40f9938c PM |
538 | /* |
539 | * sscanf() must processes at least 2 chunks; also there | |
540 | * must be no extra characters after the last chunk, so | |
541 | * str[consumed] must be '\0' | |
542 | */ | |
543 | if (processed < 2 || str[consumed]) | |
81a054ce PM |
544 | return -EINVAL; |
545 | ||
40f9938c | 546 | resources[0].flags = IORESOURCE_MEM; |
81a054ce | 547 | resources[0].start = base; |
40f9938c PM |
548 | resources[0].end = base + size - 1; |
549 | ||
550 | resources[1].flags = IORESOURCE_IRQ; | |
551 | resources[1].start = resources[1].end = irq; | |
81a054ce PM |
552 | |
553 | if (!vm_cmdline_parent_registered) { | |
554 | err = device_register(&vm_cmdline_parent); | |
555 | if (err) { | |
556 | pr_err("Failed to register parent device!\n"); | |
557 | return err; | |
558 | } | |
559 | vm_cmdline_parent_registered = 1; | |
560 | } | |
561 | ||
562 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", | |
563 | vm_cmdline_id, | |
564 | (unsigned long long)resources[0].start, | |
565 | (unsigned long long)resources[0].end, | |
566 | (int)resources[1].start); | |
567 | ||
568 | pdev = platform_device_register_resndata(&vm_cmdline_parent, | |
569 | "virtio-mmio", vm_cmdline_id++, | |
570 | resources, ARRAY_SIZE(resources), NULL, 0); | |
571 | if (IS_ERR(pdev)) | |
572 | return PTR_ERR(pdev); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | static int vm_cmdline_get_device(struct device *dev, void *data) | |
578 | { | |
579 | char *buffer = data; | |
580 | unsigned int len = strlen(buffer); | |
581 | struct platform_device *pdev = to_platform_device(dev); | |
582 | ||
583 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", | |
584 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, | |
585 | (unsigned long long)pdev->resource[0].start, | |
586 | (unsigned long long)pdev->resource[1].start, | |
587 | pdev->id); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) | |
592 | { | |
593 | buffer[0] = '\0'; | |
594 | device_for_each_child(&vm_cmdline_parent, buffer, | |
595 | vm_cmdline_get_device); | |
596 | return strlen(buffer) + 1; | |
597 | } | |
598 | ||
599 | static struct kernel_param_ops vm_cmdline_param_ops = { | |
600 | .set = vm_cmdline_set, | |
601 | .get = vm_cmdline_get, | |
602 | }; | |
603 | ||
604 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); | |
605 | ||
606 | static int vm_unregister_cmdline_device(struct device *dev, | |
607 | void *data) | |
608 | { | |
609 | platform_device_unregister(to_platform_device(dev)); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | static void vm_unregister_cmdline_devices(void) | |
615 | { | |
616 | if (vm_cmdline_parent_registered) { | |
617 | device_for_each_child(&vm_cmdline_parent, NULL, | |
618 | vm_unregister_cmdline_device); | |
619 | device_unregister(&vm_cmdline_parent); | |
620 | vm_cmdline_parent_registered = 0; | |
621 | } | |
622 | } | |
623 | ||
624 | #else | |
625 | ||
626 | static void vm_unregister_cmdline_devices(void) | |
627 | { | |
628 | } | |
629 | ||
630 | #endif | |
631 | ||
edfd52e6 PM |
632 | /* Platform driver */ |
633 | ||
634 | static struct of_device_id virtio_mmio_match[] = { | |
635 | { .compatible = "virtio,mmio", }, | |
636 | {}, | |
637 | }; | |
638 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); | |
639 | ||
640 | static struct platform_driver virtio_mmio_driver = { | |
641 | .probe = virtio_mmio_probe, | |
8590dbc7 | 642 | .remove = virtio_mmio_remove, |
edfd52e6 PM |
643 | .driver = { |
644 | .name = "virtio-mmio", | |
645 | .owner = THIS_MODULE, | |
646 | .of_match_table = virtio_mmio_match, | |
647 | }, | |
648 | }; | |
649 | ||
650 | static int __init virtio_mmio_init(void) | |
651 | { | |
652 | return platform_driver_register(&virtio_mmio_driver); | |
653 | } | |
654 | ||
655 | static void __exit virtio_mmio_exit(void) | |
656 | { | |
657 | platform_driver_unregister(&virtio_mmio_driver); | |
81a054ce | 658 | vm_unregister_cmdline_devices(); |
edfd52e6 PM |
659 | } |
660 | ||
661 | module_init(virtio_mmio_init); | |
662 | module_exit(virtio_mmio_exit); | |
663 | ||
664 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
665 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); | |
666 | MODULE_LICENSE("GPL"); |