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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 | ||
38c4ab8e | 61 | #include <linux/acpi.h> |
edfd52e6 PM |
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 number of entries in the queue */ | |
103 | unsigned int num; | |
104 | ||
edfd52e6 PM |
105 | /* the virtual address of the ring queue */ |
106 | void *queue; | |
107 | ||
108 | /* the list node for the virtqueues list */ | |
109 | struct list_head node; | |
110 | }; | |
111 | ||
112 | ||
113 | ||
114 | /* Configuration interface */ | |
115 | ||
d0254773 | 116 | static u64 vm_get_features(struct virtio_device *vdev) |
edfd52e6 PM |
117 | { |
118 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
1862ee22 PM |
119 | u64 features; |
120 | ||
121 | writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); | |
122 | features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
123 | features <<= 32; | |
edfd52e6 | 124 | |
1862ee22 PM |
125 | writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
126 | features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
edfd52e6 | 127 | |
1862ee22 | 128 | return features; |
edfd52e6 PM |
129 | } |
130 | ||
5c609a5e | 131 | static int vm_finalize_features(struct virtio_device *vdev) |
edfd52e6 PM |
132 | { |
133 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 PM |
134 | |
135 | /* Give virtio_ring a chance to accept features. */ | |
136 | vring_transport_features(vdev); | |
137 | ||
1862ee22 PM |
138 | /* Make sure there is are no mixed devices */ |
139 | if (vm_dev->version == 2 && | |
140 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { | |
141 | dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); | |
146 | writel((u32)(vdev->features >> 32), | |
147 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
93d389f8 | 148 | |
1862ee22 PM |
149 | writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
150 | writel((u32)vdev->features, | |
151 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
5c609a5e MT |
152 | |
153 | return 0; | |
edfd52e6 PM |
154 | } |
155 | ||
156 | static void vm_get(struct virtio_device *vdev, unsigned offset, | |
157 | void *buf, unsigned len) | |
158 | { | |
159 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
160 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
161 | u8 b; | |
162 | __le16 w; | |
163 | __le32 l; | |
164 | ||
165 | if (vm_dev->version == 1) { | |
166 | u8 *ptr = buf; | |
167 | int i; | |
168 | ||
169 | for (i = 0; i < len; i++) | |
170 | ptr[i] = readb(base + offset + i); | |
171 | return; | |
172 | } | |
edfd52e6 | 173 | |
704a0b5f MT |
174 | switch (len) { |
175 | case 1: | |
176 | b = readb(base + offset); | |
177 | memcpy(buf, &b, sizeof b); | |
178 | break; | |
179 | case 2: | |
180 | w = cpu_to_le16(readw(base + offset)); | |
181 | memcpy(buf, &w, sizeof w); | |
182 | break; | |
183 | case 4: | |
184 | l = cpu_to_le32(readl(base + offset)); | |
185 | memcpy(buf, &l, sizeof l); | |
186 | break; | |
187 | case 8: | |
188 | l = cpu_to_le32(readl(base + offset)); | |
189 | memcpy(buf, &l, sizeof l); | |
190 | l = cpu_to_le32(ioread32(base + offset + sizeof l)); | |
191 | memcpy(buf + sizeof l, &l, sizeof l); | |
192 | break; | |
193 | default: | |
194 | BUG(); | |
195 | } | |
edfd52e6 PM |
196 | } |
197 | ||
198 | static void vm_set(struct virtio_device *vdev, unsigned offset, | |
199 | const void *buf, unsigned len) | |
200 | { | |
201 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
202 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
203 | u8 b; | |
204 | __le16 w; | |
205 | __le32 l; | |
206 | ||
207 | if (vm_dev->version == 1) { | |
208 | const u8 *ptr = buf; | |
209 | int i; | |
210 | ||
211 | for (i = 0; i < len; i++) | |
212 | writeb(ptr[i], base + offset + i); | |
edfd52e6 | 213 | |
704a0b5f MT |
214 | return; |
215 | } | |
216 | ||
217 | switch (len) { | |
218 | case 1: | |
219 | memcpy(&b, buf, sizeof b); | |
220 | writeb(b, base + offset); | |
221 | break; | |
222 | case 2: | |
223 | memcpy(&w, buf, sizeof w); | |
224 | writew(le16_to_cpu(w), base + offset); | |
225 | break; | |
226 | case 4: | |
227 | memcpy(&l, buf, sizeof l); | |
228 | writel(le32_to_cpu(l), base + offset); | |
229 | break; | |
230 | case 8: | |
231 | memcpy(&l, buf, sizeof l); | |
232 | writel(le32_to_cpu(l), base + offset); | |
233 | memcpy(&l, buf + sizeof l, sizeof l); | |
234 | writel(le32_to_cpu(l), base + offset + sizeof l); | |
235 | break; | |
236 | default: | |
237 | BUG(); | |
238 | } | |
edfd52e6 PM |
239 | } |
240 | ||
87e7bf14 MT |
241 | static u32 vm_generation(struct virtio_device *vdev) |
242 | { | |
243 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
244 | ||
245 | if (vm_dev->version == 1) | |
246 | return 0; | |
247 | else | |
248 | return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); | |
249 | } | |
250 | ||
edfd52e6 PM |
251 | static u8 vm_get_status(struct virtio_device *vdev) |
252 | { | |
253 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
254 | ||
255 | return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; | |
256 | } | |
257 | ||
258 | static void vm_set_status(struct virtio_device *vdev, u8 status) | |
259 | { | |
260 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
261 | ||
262 | /* We should never be setting status to 0. */ | |
263 | BUG_ON(status == 0); | |
264 | ||
265 | writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); | |
266 | } | |
267 | ||
268 | static void vm_reset(struct virtio_device *vdev) | |
269 | { | |
270 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
271 | ||
272 | /* 0 status means a reset. */ | |
273 | writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); | |
274 | } | |
275 | ||
276 | ||
277 | ||
278 | /* Transport interface */ | |
279 | ||
280 | /* the notify function used when creating a virt queue */ | |
46f9c2b9 | 281 | static bool vm_notify(struct virtqueue *vq) |
edfd52e6 PM |
282 | { |
283 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
edfd52e6 PM |
284 | |
285 | /* We write the queue's selector into the notification register to | |
286 | * signal the other end */ | |
06ca287d | 287 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
46f9c2b9 | 288 | return true; |
edfd52e6 PM |
289 | } |
290 | ||
291 | /* Notify all virtqueues on an interrupt. */ | |
292 | static irqreturn_t vm_interrupt(int irq, void *opaque) | |
293 | { | |
294 | struct virtio_mmio_device *vm_dev = opaque; | |
295 | struct virtio_mmio_vq_info *info; | |
edfd52e6 PM |
296 | unsigned long status; |
297 | unsigned long flags; | |
298 | irqreturn_t ret = IRQ_NONE; | |
299 | ||
300 | /* Read and acknowledge interrupts */ | |
301 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); | |
302 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); | |
303 | ||
016c98c6 MT |
304 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { |
305 | virtio_config_changed(&vm_dev->vdev); | |
edfd52e6 PM |
306 | ret = IRQ_HANDLED; |
307 | } | |
308 | ||
309 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { | |
310 | spin_lock_irqsave(&vm_dev->lock, flags); | |
311 | list_for_each_entry(info, &vm_dev->virtqueues, node) | |
312 | ret |= vring_interrupt(irq, info->vq); | |
313 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
314 | } | |
315 | ||
316 | return ret; | |
317 | } | |
318 | ||
319 | ||
320 | ||
321 | static void vm_del_vq(struct virtqueue *vq) | |
322 | { | |
323 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
324 | struct virtio_mmio_vq_info *info = vq->priv; | |
325 | unsigned long flags, size; | |
06ca287d | 326 | unsigned int index = vq->index; |
edfd52e6 PM |
327 | |
328 | spin_lock_irqsave(&vm_dev->lock, flags); | |
329 | list_del(&info->node); | |
330 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
331 | ||
332 | vring_del_virtqueue(vq); | |
333 | ||
334 | /* Select and deactivate the queue */ | |
17bb6d40 | 335 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
1862ee22 PM |
336 | if (vm_dev->version == 1) { |
337 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
338 | } else { | |
339 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
340 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
341 | } | |
edfd52e6 PM |
342 | |
343 | size = PAGE_ALIGN(vring_size(info->num, VIRTIO_MMIO_VRING_ALIGN)); | |
344 | free_pages_exact(info->queue, size); | |
345 | kfree(info); | |
346 | } | |
347 | ||
348 | static void vm_del_vqs(struct virtio_device *vdev) | |
349 | { | |
350 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
351 | struct virtqueue *vq, *n; | |
352 | ||
353 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
354 | vm_del_vq(vq); | |
355 | ||
356 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); | |
357 | } | |
358 | ||
359 | ||
360 | ||
361 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, | |
362 | void (*callback)(struct virtqueue *vq), | |
363 | const char *name) | |
364 | { | |
365 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
366 | struct virtio_mmio_vq_info *info; | |
367 | struct virtqueue *vq; | |
368 | unsigned long flags, size; | |
369 | int err; | |
370 | ||
6457f126 MT |
371 | if (!name) |
372 | return NULL; | |
373 | ||
edfd52e6 PM |
374 | /* Select the queue we're interested in */ |
375 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); | |
376 | ||
377 | /* Queue shouldn't already be set up. */ | |
1862ee22 PM |
378 | if (readl(vm_dev->base + (vm_dev->version == 1 ? |
379 | VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { | |
edfd52e6 PM |
380 | err = -ENOENT; |
381 | goto error_available; | |
382 | } | |
383 | ||
384 | /* Allocate and fill out our active queue description */ | |
385 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
386 | if (!info) { | |
387 | err = -ENOMEM; | |
388 | goto error_kmalloc; | |
389 | } | |
edfd52e6 PM |
390 | |
391 | /* Allocate pages for the queue - start with a queue as big as | |
392 | * possible (limited by maximum size allowed by device), drop down | |
393 | * to a minimal size, just big enough to fit descriptor table | |
394 | * and two rings (which makes it "alignment_size * 2") | |
395 | */ | |
396 | info->num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); | |
d78b519f BF |
397 | |
398 | /* If the device reports a 0 entry queue, we won't be able to | |
399 | * use it to perform I/O, and vring_new_virtqueue() can't create | |
400 | * empty queues anyway, so don't bother to set up the device. | |
401 | */ | |
402 | if (info->num == 0) { | |
403 | err = -ENOENT; | |
404 | goto error_alloc_pages; | |
405 | } | |
406 | ||
edfd52e6 PM |
407 | while (1) { |
408 | size = PAGE_ALIGN(vring_size(info->num, | |
409 | VIRTIO_MMIO_VRING_ALIGN)); | |
3850d29f BF |
410 | /* Did the last iter shrink the queue below minimum size? */ |
411 | if (size < VIRTIO_MMIO_VRING_ALIGN * 2) { | |
edfd52e6 PM |
412 | err = -ENOMEM; |
413 | goto error_alloc_pages; | |
414 | } | |
415 | ||
416 | info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); | |
417 | if (info->queue) | |
418 | break; | |
419 | ||
420 | info->num /= 2; | |
421 | } | |
422 | ||
edfd52e6 | 423 | /* Create the vring */ |
17bb6d40 | 424 | vq = vring_new_virtqueue(index, info->num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
7b21e34f | 425 | true, info->queue, vm_notify, callback, name); |
edfd52e6 PM |
426 | if (!vq) { |
427 | err = -ENOMEM; | |
428 | goto error_new_virtqueue; | |
429 | } | |
430 | ||
1862ee22 PM |
431 | /* Activate the queue */ |
432 | writel(info->num, vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); | |
433 | if (vm_dev->version == 1) { | |
434 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); | |
435 | writel(virt_to_phys(info->queue) >> PAGE_SHIFT, | |
436 | vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
437 | } else { | |
438 | u64 addr; | |
439 | ||
440 | addr = virt_to_phys(info->queue); | |
441 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); | |
442 | writel((u32)(addr >> 32), | |
443 | vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); | |
444 | ||
445 | addr = virt_to_phys(virtqueue_get_avail(vq)); | |
446 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); | |
447 | writel((u32)(addr >> 32), | |
448 | vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); | |
449 | ||
450 | addr = virt_to_phys(virtqueue_get_used(vq)); | |
451 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); | |
452 | writel((u32)(addr >> 32), | |
453 | vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); | |
454 | ||
455 | writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
456 | } | |
457 | ||
edfd52e6 PM |
458 | vq->priv = info; |
459 | info->vq = vq; | |
460 | ||
461 | spin_lock_irqsave(&vm_dev->lock, flags); | |
462 | list_add(&info->node, &vm_dev->virtqueues); | |
463 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
464 | ||
465 | return vq; | |
466 | ||
467 | error_new_virtqueue: | |
1862ee22 PM |
468 | if (vm_dev->version == 1) { |
469 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
470 | } else { | |
471 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
472 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
473 | } | |
edfd52e6 PM |
474 | free_pages_exact(info->queue, size); |
475 | error_alloc_pages: | |
476 | kfree(info); | |
477 | error_kmalloc: | |
478 | error_available: | |
479 | return ERR_PTR(err); | |
480 | } | |
481 | ||
482 | static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, | |
483 | struct virtqueue *vqs[], | |
484 | vq_callback_t *callbacks[], | |
f7ad26ff | 485 | const char * const names[]) |
edfd52e6 PM |
486 | { |
487 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
488 | unsigned int irq = platform_get_irq(vm_dev->pdev, 0); | |
489 | int i, err; | |
490 | ||
491 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, | |
492 | dev_name(&vdev->dev), vm_dev); | |
493 | if (err) | |
494 | return err; | |
495 | ||
496 | for (i = 0; i < nvqs; ++i) { | |
497 | vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]); | |
498 | if (IS_ERR(vqs[i])) { | |
499 | vm_del_vqs(vdev); | |
500 | return PTR_ERR(vqs[i]); | |
501 | } | |
502 | } | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
66846048 RJ |
507 | static const char *vm_bus_name(struct virtio_device *vdev) |
508 | { | |
509 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 | 510 | |
66846048 RJ |
511 | return vm_dev->pdev->name; |
512 | } | |
edfd52e6 | 513 | |
93503932 | 514 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
edfd52e6 PM |
515 | .get = vm_get, |
516 | .set = vm_set, | |
87e7bf14 | 517 | .generation = vm_generation, |
edfd52e6 PM |
518 | .get_status = vm_get_status, |
519 | .set_status = vm_set_status, | |
520 | .reset = vm_reset, | |
521 | .find_vqs = vm_find_vqs, | |
522 | .del_vqs = vm_del_vqs, | |
523 | .get_features = vm_get_features, | |
524 | .finalize_features = vm_finalize_features, | |
66846048 | 525 | .bus_name = vm_bus_name, |
edfd52e6 PM |
526 | }; |
527 | ||
528 | ||
529 | ||
530 | /* Platform device */ | |
531 | ||
8590dbc7 | 532 | static int virtio_mmio_probe(struct platform_device *pdev) |
edfd52e6 PM |
533 | { |
534 | struct virtio_mmio_device *vm_dev; | |
535 | struct resource *mem; | |
536 | unsigned long magic; | |
537 | ||
538 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
539 | if (!mem) | |
540 | return -EINVAL; | |
541 | ||
542 | if (!devm_request_mem_region(&pdev->dev, mem->start, | |
543 | resource_size(mem), pdev->name)) | |
544 | return -EBUSY; | |
545 | ||
546 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); | |
547 | if (!vm_dev) | |
548 | return -ENOMEM; | |
549 | ||
550 | vm_dev->vdev.dev.parent = &pdev->dev; | |
551 | vm_dev->vdev.config = &virtio_mmio_config_ops; | |
552 | vm_dev->pdev = pdev; | |
553 | INIT_LIST_HEAD(&vm_dev->virtqueues); | |
554 | spin_lock_init(&vm_dev->lock); | |
555 | ||
556 | vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); | |
557 | if (vm_dev->base == NULL) | |
558 | return -EFAULT; | |
559 | ||
560 | /* Check magic value */ | |
561 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); | |
4ae85370 | 562 | if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
edfd52e6 PM |
563 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
564 | return -ENODEV; | |
565 | } | |
566 | ||
567 | /* Check device version */ | |
568 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); | |
1862ee22 | 569 | if (vm_dev->version < 1 || vm_dev->version > 2) { |
edfd52e6 PM |
570 | dev_err(&pdev->dev, "Version %ld not supported!\n", |
571 | vm_dev->version); | |
572 | return -ENXIO; | |
573 | } | |
574 | ||
575 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); | |
1862ee22 PM |
576 | if (vm_dev->vdev.id.device == 0) { |
577 | /* | |
578 | * virtio-mmio device with an ID 0 is a (dummy) placeholder | |
579 | * with no function. End probing now with no error reported. | |
580 | */ | |
581 | return -ENODEV; | |
582 | } | |
edfd52e6 PM |
583 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
584 | ||
1862ee22 PM |
585 | if (vm_dev->version == 1) |
586 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); | |
edfd52e6 PM |
587 | |
588 | platform_set_drvdata(pdev, vm_dev); | |
589 | ||
590 | return register_virtio_device(&vm_dev->vdev); | |
591 | } | |
592 | ||
8590dbc7 | 593 | static int virtio_mmio_remove(struct platform_device *pdev) |
edfd52e6 PM |
594 | { |
595 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); | |
596 | ||
597 | unregister_virtio_device(&vm_dev->vdev); | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | ||
603 | ||
81a054ce PM |
604 | /* Devices list parameter */ |
605 | ||
606 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) | |
607 | ||
608 | static struct device vm_cmdline_parent = { | |
609 | .init_name = "virtio-mmio-cmdline", | |
610 | }; | |
611 | ||
612 | static int vm_cmdline_parent_registered; | |
613 | static int vm_cmdline_id; | |
614 | ||
615 | static int vm_cmdline_set(const char *device, | |
616 | const struct kernel_param *kp) | |
617 | { | |
618 | int err; | |
619 | struct resource resources[2] = {}; | |
620 | char *str; | |
40f9938c PM |
621 | long long int base, size; |
622 | unsigned int irq; | |
81a054ce PM |
623 | int processed, consumed = 0; |
624 | struct platform_device *pdev; | |
625 | ||
40f9938c PM |
626 | /* Consume "size" part of the command line parameter */ |
627 | size = memparse(device, &str); | |
81a054ce | 628 | |
40f9938c | 629 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
81a054ce | 630 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
40f9938c | 631 | &base, &irq, &consumed, |
81a054ce PM |
632 | &vm_cmdline_id, &consumed); |
633 | ||
40f9938c PM |
634 | /* |
635 | * sscanf() must processes at least 2 chunks; also there | |
636 | * must be no extra characters after the last chunk, so | |
637 | * str[consumed] must be '\0' | |
638 | */ | |
639 | if (processed < 2 || str[consumed]) | |
81a054ce PM |
640 | return -EINVAL; |
641 | ||
40f9938c | 642 | resources[0].flags = IORESOURCE_MEM; |
81a054ce | 643 | resources[0].start = base; |
40f9938c PM |
644 | resources[0].end = base + size - 1; |
645 | ||
646 | resources[1].flags = IORESOURCE_IRQ; | |
647 | resources[1].start = resources[1].end = irq; | |
81a054ce PM |
648 | |
649 | if (!vm_cmdline_parent_registered) { | |
650 | err = device_register(&vm_cmdline_parent); | |
651 | if (err) { | |
652 | pr_err("Failed to register parent device!\n"); | |
653 | return err; | |
654 | } | |
655 | vm_cmdline_parent_registered = 1; | |
656 | } | |
657 | ||
658 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", | |
659 | vm_cmdline_id, | |
660 | (unsigned long long)resources[0].start, | |
661 | (unsigned long long)resources[0].end, | |
662 | (int)resources[1].start); | |
663 | ||
664 | pdev = platform_device_register_resndata(&vm_cmdline_parent, | |
665 | "virtio-mmio", vm_cmdline_id++, | |
666 | resources, ARRAY_SIZE(resources), NULL, 0); | |
667 | if (IS_ERR(pdev)) | |
668 | return PTR_ERR(pdev); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static int vm_cmdline_get_device(struct device *dev, void *data) | |
674 | { | |
675 | char *buffer = data; | |
676 | unsigned int len = strlen(buffer); | |
677 | struct platform_device *pdev = to_platform_device(dev); | |
678 | ||
679 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", | |
680 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, | |
681 | (unsigned long long)pdev->resource[0].start, | |
682 | (unsigned long long)pdev->resource[1].start, | |
683 | pdev->id); | |
684 | return 0; | |
685 | } | |
686 | ||
687 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) | |
688 | { | |
689 | buffer[0] = '\0'; | |
690 | device_for_each_child(&vm_cmdline_parent, buffer, | |
691 | vm_cmdline_get_device); | |
692 | return strlen(buffer) + 1; | |
693 | } | |
694 | ||
9c27847d | 695 | static const struct kernel_param_ops vm_cmdline_param_ops = { |
81a054ce PM |
696 | .set = vm_cmdline_set, |
697 | .get = vm_cmdline_get, | |
698 | }; | |
699 | ||
700 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); | |
701 | ||
702 | static int vm_unregister_cmdline_device(struct device *dev, | |
703 | void *data) | |
704 | { | |
705 | platform_device_unregister(to_platform_device(dev)); | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | static void vm_unregister_cmdline_devices(void) | |
711 | { | |
712 | if (vm_cmdline_parent_registered) { | |
713 | device_for_each_child(&vm_cmdline_parent, NULL, | |
714 | vm_unregister_cmdline_device); | |
715 | device_unregister(&vm_cmdline_parent); | |
716 | vm_cmdline_parent_registered = 0; | |
717 | } | |
718 | } | |
719 | ||
720 | #else | |
721 | ||
722 | static void vm_unregister_cmdline_devices(void) | |
723 | { | |
724 | } | |
725 | ||
726 | #endif | |
727 | ||
edfd52e6 PM |
728 | /* Platform driver */ |
729 | ||
730 | static struct of_device_id virtio_mmio_match[] = { | |
731 | { .compatible = "virtio,mmio", }, | |
732 | {}, | |
733 | }; | |
734 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); | |
735 | ||
38c4ab8e GG |
736 | #ifdef CONFIG_ACPI |
737 | static const struct acpi_device_id virtio_mmio_acpi_match[] = { | |
738 | { "LNRO0005", }, | |
739 | { } | |
740 | }; | |
741 | MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); | |
742 | #endif | |
743 | ||
edfd52e6 PM |
744 | static struct platform_driver virtio_mmio_driver = { |
745 | .probe = virtio_mmio_probe, | |
8590dbc7 | 746 | .remove = virtio_mmio_remove, |
edfd52e6 PM |
747 | .driver = { |
748 | .name = "virtio-mmio", | |
edfd52e6 | 749 | .of_match_table = virtio_mmio_match, |
38c4ab8e | 750 | .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), |
edfd52e6 PM |
751 | }, |
752 | }; | |
753 | ||
754 | static int __init virtio_mmio_init(void) | |
755 | { | |
756 | return platform_driver_register(&virtio_mmio_driver); | |
757 | } | |
758 | ||
759 | static void __exit virtio_mmio_exit(void) | |
760 | { | |
761 | platform_driver_unregister(&virtio_mmio_driver); | |
81a054ce | 762 | vm_unregister_cmdline_devices(); |
edfd52e6 PM |
763 | } |
764 | ||
765 | module_init(virtio_mmio_init); | |
766 | module_exit(virtio_mmio_exit); | |
767 | ||
768 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
769 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); | |
770 | MODULE_LICENSE("GPL"); |