Commit | Line | Data |
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edfd52e6 PM |
1 | /* |
2 | * Virtio memory mapped device driver | |
3 | * | |
1862ee22 | 4 | * Copyright 2011-2014, ARM Ltd. |
edfd52e6 PM |
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 | * 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 | ||
81a054ce PM |
59 | #define pr_fmt(fmt) "virtio-mmio: " fmt |
60 | ||
edfd52e6 PM |
61 | #include <linux/highmem.h> |
62 | #include <linux/interrupt.h> | |
63 | #include <linux/io.h> | |
64 | #include <linux/list.h> | |
65 | #include <linux/module.h> | |
66 | #include <linux/platform_device.h> | |
67 | #include <linux/slab.h> | |
68 | #include <linux/spinlock.h> | |
69 | #include <linux/virtio.h> | |
70 | #include <linux/virtio_config.h> | |
71 | #include <linux/virtio_mmio.h> | |
72 | #include <linux/virtio_ring.h> | |
73 | ||
74 | ||
75 | ||
76 | /* The alignment to use between consumer and producer parts of vring. | |
77 | * Currently hardcoded to the page size. */ | |
78 | #define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE | |
79 | ||
80 | ||
81 | ||
82 | #define to_virtio_mmio_device(_plat_dev) \ | |
83 | container_of(_plat_dev, struct virtio_mmio_device, vdev) | |
84 | ||
85 | struct virtio_mmio_device { | |
86 | struct virtio_device vdev; | |
87 | struct platform_device *pdev; | |
88 | ||
89 | void __iomem *base; | |
90 | unsigned long version; | |
91 | ||
92 | /* a list of queues so we can dispatch IRQs */ | |
93 | spinlock_t lock; | |
94 | struct list_head virtqueues; | |
95 | }; | |
96 | ||
97 | struct virtio_mmio_vq_info { | |
98 | /* the actual virtqueue */ | |
99 | struct virtqueue *vq; | |
100 | ||
101 | /* the number of entries in the queue */ | |
102 | unsigned int num; | |
103 | ||
edfd52e6 PM |
104 | /* the virtual address of the ring queue */ |
105 | void *queue; | |
106 | ||
107 | /* the list node for the virtqueues list */ | |
108 | struct list_head node; | |
109 | }; | |
110 | ||
111 | ||
112 | ||
113 | /* Configuration interface */ | |
114 | ||
d0254773 | 115 | static u64 vm_get_features(struct virtio_device *vdev) |
edfd52e6 PM |
116 | { |
117 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
1862ee22 PM |
118 | u64 features; |
119 | ||
120 | writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); | |
121 | features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
122 | features <<= 32; | |
edfd52e6 | 123 | |
1862ee22 PM |
124 | writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
125 | features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
edfd52e6 | 126 | |
1862ee22 | 127 | return features; |
edfd52e6 PM |
128 | } |
129 | ||
5c609a5e | 130 | static int vm_finalize_features(struct virtio_device *vdev) |
edfd52e6 PM |
131 | { |
132 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 PM |
133 | |
134 | /* Give virtio_ring a chance to accept features. */ | |
135 | vring_transport_features(vdev); | |
136 | ||
1862ee22 PM |
137 | /* Make sure there is are no mixed devices */ |
138 | if (vm_dev->version == 2 && | |
139 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { | |
140 | dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); | |
141 | return -EINVAL; | |
142 | } | |
143 | ||
144 | writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); | |
145 | writel((u32)(vdev->features >> 32), | |
146 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
93d389f8 | 147 | |
1862ee22 PM |
148 | writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
149 | writel((u32)vdev->features, | |
150 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
5c609a5e MT |
151 | |
152 | return 0; | |
edfd52e6 PM |
153 | } |
154 | ||
155 | static void vm_get(struct virtio_device *vdev, unsigned offset, | |
156 | void *buf, unsigned len) | |
157 | { | |
158 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
159 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
160 | u8 b; | |
161 | __le16 w; | |
162 | __le32 l; | |
163 | ||
164 | if (vm_dev->version == 1) { | |
165 | u8 *ptr = buf; | |
166 | int i; | |
167 | ||
168 | for (i = 0; i < len; i++) | |
169 | ptr[i] = readb(base + offset + i); | |
170 | return; | |
171 | } | |
edfd52e6 | 172 | |
704a0b5f MT |
173 | switch (len) { |
174 | case 1: | |
175 | b = readb(base + offset); | |
176 | memcpy(buf, &b, sizeof b); | |
177 | break; | |
178 | case 2: | |
179 | w = cpu_to_le16(readw(base + offset)); | |
180 | memcpy(buf, &w, sizeof w); | |
181 | break; | |
182 | case 4: | |
183 | l = cpu_to_le32(readl(base + offset)); | |
184 | memcpy(buf, &l, sizeof l); | |
185 | break; | |
186 | case 8: | |
187 | l = cpu_to_le32(readl(base + offset)); | |
188 | memcpy(buf, &l, sizeof l); | |
189 | l = cpu_to_le32(ioread32(base + offset + sizeof l)); | |
190 | memcpy(buf + sizeof l, &l, sizeof l); | |
191 | break; | |
192 | default: | |
193 | BUG(); | |
194 | } | |
edfd52e6 PM |
195 | } |
196 | ||
197 | static void vm_set(struct virtio_device *vdev, unsigned offset, | |
198 | const void *buf, unsigned len) | |
199 | { | |
200 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
201 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
202 | u8 b; | |
203 | __le16 w; | |
204 | __le32 l; | |
205 | ||
206 | if (vm_dev->version == 1) { | |
207 | const u8 *ptr = buf; | |
208 | int i; | |
209 | ||
210 | for (i = 0; i < len; i++) | |
211 | writeb(ptr[i], base + offset + i); | |
edfd52e6 | 212 | |
704a0b5f MT |
213 | return; |
214 | } | |
215 | ||
216 | switch (len) { | |
217 | case 1: | |
218 | memcpy(&b, buf, sizeof b); | |
219 | writeb(b, base + offset); | |
220 | break; | |
221 | case 2: | |
222 | memcpy(&w, buf, sizeof w); | |
223 | writew(le16_to_cpu(w), base + offset); | |
224 | break; | |
225 | case 4: | |
226 | memcpy(&l, buf, sizeof l); | |
227 | writel(le32_to_cpu(l), base + offset); | |
228 | break; | |
229 | case 8: | |
230 | memcpy(&l, buf, sizeof l); | |
231 | writel(le32_to_cpu(l), base + offset); | |
232 | memcpy(&l, buf + sizeof l, sizeof l); | |
233 | writel(le32_to_cpu(l), base + offset + sizeof l); | |
234 | break; | |
235 | default: | |
236 | BUG(); | |
237 | } | |
edfd52e6 PM |
238 | } |
239 | ||
87e7bf14 MT |
240 | static u32 vm_generation(struct virtio_device *vdev) |
241 | { | |
242 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
243 | ||
244 | if (vm_dev->version == 1) | |
245 | return 0; | |
246 | else | |
247 | return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); | |
248 | } | |
249 | ||
edfd52e6 PM |
250 | static u8 vm_get_status(struct virtio_device *vdev) |
251 | { | |
252 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
253 | ||
254 | return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; | |
255 | } | |
256 | ||
257 | static void vm_set_status(struct virtio_device *vdev, u8 status) | |
258 | { | |
259 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
260 | ||
261 | /* We should never be setting status to 0. */ | |
262 | BUG_ON(status == 0); | |
263 | ||
264 | writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); | |
265 | } | |
266 | ||
267 | static void vm_reset(struct virtio_device *vdev) | |
268 | { | |
269 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
270 | ||
271 | /* 0 status means a reset. */ | |
272 | writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); | |
273 | } | |
274 | ||
275 | ||
276 | ||
277 | /* Transport interface */ | |
278 | ||
279 | /* the notify function used when creating a virt queue */ | |
46f9c2b9 | 280 | static bool vm_notify(struct virtqueue *vq) |
edfd52e6 PM |
281 | { |
282 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
edfd52e6 PM |
283 | |
284 | /* We write the queue's selector into the notification register to | |
285 | * signal the other end */ | |
06ca287d | 286 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
46f9c2b9 | 287 | return true; |
edfd52e6 PM |
288 | } |
289 | ||
290 | /* Notify all virtqueues on an interrupt. */ | |
291 | static irqreturn_t vm_interrupt(int irq, void *opaque) | |
292 | { | |
293 | struct virtio_mmio_device *vm_dev = opaque; | |
294 | struct virtio_mmio_vq_info *info; | |
edfd52e6 PM |
295 | unsigned long status; |
296 | unsigned long flags; | |
297 | irqreturn_t ret = IRQ_NONE; | |
298 | ||
299 | /* Read and acknowledge interrupts */ | |
300 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); | |
301 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); | |
302 | ||
016c98c6 MT |
303 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { |
304 | virtio_config_changed(&vm_dev->vdev); | |
edfd52e6 PM |
305 | ret = IRQ_HANDLED; |
306 | } | |
307 | ||
308 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { | |
309 | spin_lock_irqsave(&vm_dev->lock, flags); | |
310 | list_for_each_entry(info, &vm_dev->virtqueues, node) | |
311 | ret |= vring_interrupt(irq, info->vq); | |
312 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
313 | } | |
314 | ||
315 | return ret; | |
316 | } | |
317 | ||
318 | ||
319 | ||
320 | static void vm_del_vq(struct virtqueue *vq) | |
321 | { | |
322 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
323 | struct virtio_mmio_vq_info *info = vq->priv; | |
324 | unsigned long flags, size; | |
06ca287d | 325 | unsigned int index = vq->index; |
edfd52e6 PM |
326 | |
327 | spin_lock_irqsave(&vm_dev->lock, flags); | |
328 | list_del(&info->node); | |
329 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
330 | ||
331 | vring_del_virtqueue(vq); | |
332 | ||
333 | /* Select and deactivate the queue */ | |
17bb6d40 | 334 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
1862ee22 PM |
335 | if (vm_dev->version == 1) { |
336 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
337 | } else { | |
338 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
339 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
340 | } | |
edfd52e6 PM |
341 | |
342 | size = PAGE_ALIGN(vring_size(info->num, VIRTIO_MMIO_VRING_ALIGN)); | |
343 | free_pages_exact(info->queue, size); | |
344 | kfree(info); | |
345 | } | |
346 | ||
347 | static void vm_del_vqs(struct virtio_device *vdev) | |
348 | { | |
349 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
350 | struct virtqueue *vq, *n; | |
351 | ||
352 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
353 | vm_del_vq(vq); | |
354 | ||
355 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); | |
356 | } | |
357 | ||
358 | ||
359 | ||
360 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, | |
361 | void (*callback)(struct virtqueue *vq), | |
362 | const char *name) | |
363 | { | |
364 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
365 | struct virtio_mmio_vq_info *info; | |
366 | struct virtqueue *vq; | |
367 | unsigned long flags, size; | |
368 | int err; | |
369 | ||
6457f126 MT |
370 | if (!name) |
371 | return NULL; | |
372 | ||
edfd52e6 PM |
373 | /* Select the queue we're interested in */ |
374 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); | |
375 | ||
376 | /* Queue shouldn't already be set up. */ | |
1862ee22 PM |
377 | if (readl(vm_dev->base + (vm_dev->version == 1 ? |
378 | VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { | |
edfd52e6 PM |
379 | err = -ENOENT; |
380 | goto error_available; | |
381 | } | |
382 | ||
383 | /* Allocate and fill out our active queue description */ | |
384 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
385 | if (!info) { | |
386 | err = -ENOMEM; | |
387 | goto error_kmalloc; | |
388 | } | |
edfd52e6 PM |
389 | |
390 | /* Allocate pages for the queue - start with a queue as big as | |
391 | * possible (limited by maximum size allowed by device), drop down | |
392 | * to a minimal size, just big enough to fit descriptor table | |
393 | * and two rings (which makes it "alignment_size * 2") | |
394 | */ | |
395 | info->num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); | |
d78b519f BF |
396 | |
397 | /* If the device reports a 0 entry queue, we won't be able to | |
398 | * use it to perform I/O, and vring_new_virtqueue() can't create | |
399 | * empty queues anyway, so don't bother to set up the device. | |
400 | */ | |
401 | if (info->num == 0) { | |
402 | err = -ENOENT; | |
403 | goto error_alloc_pages; | |
404 | } | |
405 | ||
edfd52e6 PM |
406 | while (1) { |
407 | size = PAGE_ALIGN(vring_size(info->num, | |
408 | VIRTIO_MMIO_VRING_ALIGN)); | |
3850d29f BF |
409 | /* Did the last iter shrink the queue below minimum size? */ |
410 | if (size < VIRTIO_MMIO_VRING_ALIGN * 2) { | |
edfd52e6 PM |
411 | err = -ENOMEM; |
412 | goto error_alloc_pages; | |
413 | } | |
414 | ||
415 | info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); | |
416 | if (info->queue) | |
417 | break; | |
418 | ||
419 | info->num /= 2; | |
420 | } | |
421 | ||
edfd52e6 | 422 | /* Create the vring */ |
17bb6d40 | 423 | vq = vring_new_virtqueue(index, info->num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
7b21e34f | 424 | true, info->queue, vm_notify, callback, name); |
edfd52e6 PM |
425 | if (!vq) { |
426 | err = -ENOMEM; | |
427 | goto error_new_virtqueue; | |
428 | } | |
429 | ||
1862ee22 PM |
430 | /* Activate the queue */ |
431 | writel(info->num, vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); | |
432 | if (vm_dev->version == 1) { | |
433 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); | |
434 | writel(virt_to_phys(info->queue) >> PAGE_SHIFT, | |
435 | vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
436 | } else { | |
437 | u64 addr; | |
438 | ||
439 | addr = virt_to_phys(info->queue); | |
440 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); | |
441 | writel((u32)(addr >> 32), | |
442 | vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); | |
443 | ||
444 | addr = virt_to_phys(virtqueue_get_avail(vq)); | |
445 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); | |
446 | writel((u32)(addr >> 32), | |
447 | vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); | |
448 | ||
449 | addr = virt_to_phys(virtqueue_get_used(vq)); | |
450 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); | |
451 | writel((u32)(addr >> 32), | |
452 | vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); | |
453 | ||
454 | writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
455 | } | |
456 | ||
edfd52e6 PM |
457 | vq->priv = info; |
458 | info->vq = vq; | |
459 | ||
460 | spin_lock_irqsave(&vm_dev->lock, flags); | |
461 | list_add(&info->node, &vm_dev->virtqueues); | |
462 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
463 | ||
464 | return vq; | |
465 | ||
466 | error_new_virtqueue: | |
1862ee22 PM |
467 | if (vm_dev->version == 1) { |
468 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
469 | } else { | |
470 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
471 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
472 | } | |
edfd52e6 PM |
473 | free_pages_exact(info->queue, size); |
474 | error_alloc_pages: | |
475 | kfree(info); | |
476 | error_kmalloc: | |
477 | error_available: | |
478 | return ERR_PTR(err); | |
479 | } | |
480 | ||
481 | static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, | |
482 | struct virtqueue *vqs[], | |
483 | vq_callback_t *callbacks[], | |
484 | const char *names[]) | |
485 | { | |
486 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
487 | unsigned int irq = platform_get_irq(vm_dev->pdev, 0); | |
488 | int i, err; | |
489 | ||
490 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, | |
491 | dev_name(&vdev->dev), vm_dev); | |
492 | if (err) | |
493 | return err; | |
494 | ||
495 | for (i = 0; i < nvqs; ++i) { | |
496 | vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]); | |
497 | if (IS_ERR(vqs[i])) { | |
498 | vm_del_vqs(vdev); | |
499 | return PTR_ERR(vqs[i]); | |
500 | } | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
66846048 RJ |
506 | static const char *vm_bus_name(struct virtio_device *vdev) |
507 | { | |
508 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 | 509 | |
66846048 RJ |
510 | return vm_dev->pdev->name; |
511 | } | |
edfd52e6 | 512 | |
93503932 | 513 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
edfd52e6 PM |
514 | .get = vm_get, |
515 | .set = vm_set, | |
87e7bf14 | 516 | .generation = vm_generation, |
edfd52e6 PM |
517 | .get_status = vm_get_status, |
518 | .set_status = vm_set_status, | |
519 | .reset = vm_reset, | |
520 | .find_vqs = vm_find_vqs, | |
521 | .del_vqs = vm_del_vqs, | |
522 | .get_features = vm_get_features, | |
523 | .finalize_features = vm_finalize_features, | |
66846048 | 524 | .bus_name = vm_bus_name, |
edfd52e6 PM |
525 | }; |
526 | ||
527 | ||
528 | ||
529 | /* Platform device */ | |
530 | ||
8590dbc7 | 531 | static int virtio_mmio_probe(struct platform_device *pdev) |
edfd52e6 PM |
532 | { |
533 | struct virtio_mmio_device *vm_dev; | |
534 | struct resource *mem; | |
535 | unsigned long magic; | |
536 | ||
537 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
538 | if (!mem) | |
539 | return -EINVAL; | |
540 | ||
541 | if (!devm_request_mem_region(&pdev->dev, mem->start, | |
542 | resource_size(mem), pdev->name)) | |
543 | return -EBUSY; | |
544 | ||
545 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); | |
546 | if (!vm_dev) | |
547 | return -ENOMEM; | |
548 | ||
549 | vm_dev->vdev.dev.parent = &pdev->dev; | |
550 | vm_dev->vdev.config = &virtio_mmio_config_ops; | |
551 | vm_dev->pdev = pdev; | |
552 | INIT_LIST_HEAD(&vm_dev->virtqueues); | |
553 | spin_lock_init(&vm_dev->lock); | |
554 | ||
555 | vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); | |
556 | if (vm_dev->base == NULL) | |
557 | return -EFAULT; | |
558 | ||
559 | /* Check magic value */ | |
560 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); | |
4ae85370 | 561 | if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
edfd52e6 PM |
562 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
563 | return -ENODEV; | |
564 | } | |
565 | ||
566 | /* Check device version */ | |
567 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); | |
1862ee22 | 568 | if (vm_dev->version < 1 || vm_dev->version > 2) { |
edfd52e6 PM |
569 | dev_err(&pdev->dev, "Version %ld not supported!\n", |
570 | vm_dev->version); | |
571 | return -ENXIO; | |
572 | } | |
573 | ||
574 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); | |
1862ee22 PM |
575 | if (vm_dev->vdev.id.device == 0) { |
576 | /* | |
577 | * virtio-mmio device with an ID 0 is a (dummy) placeholder | |
578 | * with no function. End probing now with no error reported. | |
579 | */ | |
580 | return -ENODEV; | |
581 | } | |
edfd52e6 PM |
582 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
583 | ||
1862ee22 PM |
584 | if (vm_dev->version == 1) |
585 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); | |
edfd52e6 PM |
586 | |
587 | platform_set_drvdata(pdev, vm_dev); | |
588 | ||
589 | return register_virtio_device(&vm_dev->vdev); | |
590 | } | |
591 | ||
8590dbc7 | 592 | static int virtio_mmio_remove(struct platform_device *pdev) |
edfd52e6 PM |
593 | { |
594 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); | |
595 | ||
596 | unregister_virtio_device(&vm_dev->vdev); | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | ||
602 | ||
81a054ce PM |
603 | /* Devices list parameter */ |
604 | ||
605 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) | |
606 | ||
607 | static struct device vm_cmdline_parent = { | |
608 | .init_name = "virtio-mmio-cmdline", | |
609 | }; | |
610 | ||
611 | static int vm_cmdline_parent_registered; | |
612 | static int vm_cmdline_id; | |
613 | ||
614 | static int vm_cmdline_set(const char *device, | |
615 | const struct kernel_param *kp) | |
616 | { | |
617 | int err; | |
618 | struct resource resources[2] = {}; | |
619 | char *str; | |
40f9938c PM |
620 | long long int base, size; |
621 | unsigned int irq; | |
81a054ce PM |
622 | int processed, consumed = 0; |
623 | struct platform_device *pdev; | |
624 | ||
40f9938c PM |
625 | /* Consume "size" part of the command line parameter */ |
626 | size = memparse(device, &str); | |
81a054ce | 627 | |
40f9938c | 628 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
81a054ce | 629 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
40f9938c | 630 | &base, &irq, &consumed, |
81a054ce PM |
631 | &vm_cmdline_id, &consumed); |
632 | ||
40f9938c PM |
633 | /* |
634 | * sscanf() must processes at least 2 chunks; also there | |
635 | * must be no extra characters after the last chunk, so | |
636 | * str[consumed] must be '\0' | |
637 | */ | |
638 | if (processed < 2 || str[consumed]) | |
81a054ce PM |
639 | return -EINVAL; |
640 | ||
40f9938c | 641 | resources[0].flags = IORESOURCE_MEM; |
81a054ce | 642 | resources[0].start = base; |
40f9938c PM |
643 | resources[0].end = base + size - 1; |
644 | ||
645 | resources[1].flags = IORESOURCE_IRQ; | |
646 | resources[1].start = resources[1].end = irq; | |
81a054ce PM |
647 | |
648 | if (!vm_cmdline_parent_registered) { | |
649 | err = device_register(&vm_cmdline_parent); | |
650 | if (err) { | |
651 | pr_err("Failed to register parent device!\n"); | |
652 | return err; | |
653 | } | |
654 | vm_cmdline_parent_registered = 1; | |
655 | } | |
656 | ||
657 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", | |
658 | vm_cmdline_id, | |
659 | (unsigned long long)resources[0].start, | |
660 | (unsigned long long)resources[0].end, | |
661 | (int)resources[1].start); | |
662 | ||
663 | pdev = platform_device_register_resndata(&vm_cmdline_parent, | |
664 | "virtio-mmio", vm_cmdline_id++, | |
665 | resources, ARRAY_SIZE(resources), NULL, 0); | |
666 | if (IS_ERR(pdev)) | |
667 | return PTR_ERR(pdev); | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | static int vm_cmdline_get_device(struct device *dev, void *data) | |
673 | { | |
674 | char *buffer = data; | |
675 | unsigned int len = strlen(buffer); | |
676 | struct platform_device *pdev = to_platform_device(dev); | |
677 | ||
678 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", | |
679 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, | |
680 | (unsigned long long)pdev->resource[0].start, | |
681 | (unsigned long long)pdev->resource[1].start, | |
682 | pdev->id); | |
683 | return 0; | |
684 | } | |
685 | ||
686 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) | |
687 | { | |
688 | buffer[0] = '\0'; | |
689 | device_for_each_child(&vm_cmdline_parent, buffer, | |
690 | vm_cmdline_get_device); | |
691 | return strlen(buffer) + 1; | |
692 | } | |
693 | ||
694 | static struct kernel_param_ops vm_cmdline_param_ops = { | |
695 | .set = vm_cmdline_set, | |
696 | .get = vm_cmdline_get, | |
697 | }; | |
698 | ||
699 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); | |
700 | ||
701 | static int vm_unregister_cmdline_device(struct device *dev, | |
702 | void *data) | |
703 | { | |
704 | platform_device_unregister(to_platform_device(dev)); | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
709 | static void vm_unregister_cmdline_devices(void) | |
710 | { | |
711 | if (vm_cmdline_parent_registered) { | |
712 | device_for_each_child(&vm_cmdline_parent, NULL, | |
713 | vm_unregister_cmdline_device); | |
714 | device_unregister(&vm_cmdline_parent); | |
715 | vm_cmdline_parent_registered = 0; | |
716 | } | |
717 | } | |
718 | ||
719 | #else | |
720 | ||
721 | static void vm_unregister_cmdline_devices(void) | |
722 | { | |
723 | } | |
724 | ||
725 | #endif | |
726 | ||
edfd52e6 PM |
727 | /* Platform driver */ |
728 | ||
729 | static struct of_device_id virtio_mmio_match[] = { | |
730 | { .compatible = "virtio,mmio", }, | |
731 | {}, | |
732 | }; | |
733 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); | |
734 | ||
735 | static struct platform_driver virtio_mmio_driver = { | |
736 | .probe = virtio_mmio_probe, | |
8590dbc7 | 737 | .remove = virtio_mmio_remove, |
edfd52e6 PM |
738 | .driver = { |
739 | .name = "virtio-mmio", | |
edfd52e6 PM |
740 | .of_match_table = virtio_mmio_match, |
741 | }, | |
742 | }; | |
743 | ||
744 | static int __init virtio_mmio_init(void) | |
745 | { | |
746 | return platform_driver_register(&virtio_mmio_driver); | |
747 | } | |
748 | ||
749 | static void __exit virtio_mmio_exit(void) | |
750 | { | |
751 | platform_driver_unregister(&virtio_mmio_driver); | |
81a054ce | 752 | vm_unregister_cmdline_devices(); |
edfd52e6 PM |
753 | } |
754 | ||
755 | module_init(virtio_mmio_init); | |
756 | module_exit(virtio_mmio_exit); | |
757 | ||
758 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
759 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); | |
760 | MODULE_LICENSE("GPL"); |