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 | ||
edfd52e6 PM |
102 | /* the list node for the virtqueues list */ |
103 | struct list_head node; | |
104 | }; | |
105 | ||
106 | ||
107 | ||
108 | /* Configuration interface */ | |
109 | ||
d0254773 | 110 | static u64 vm_get_features(struct virtio_device *vdev) |
edfd52e6 PM |
111 | { |
112 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
1862ee22 PM |
113 | u64 features; |
114 | ||
115 | writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); | |
116 | features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
117 | features <<= 32; | |
edfd52e6 | 118 | |
1862ee22 PM |
119 | writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
120 | features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
edfd52e6 | 121 | |
1862ee22 | 122 | return features; |
edfd52e6 PM |
123 | } |
124 | ||
5c609a5e | 125 | static int vm_finalize_features(struct virtio_device *vdev) |
edfd52e6 PM |
126 | { |
127 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 PM |
128 | |
129 | /* Give virtio_ring a chance to accept features. */ | |
130 | vring_transport_features(vdev); | |
131 | ||
1862ee22 PM |
132 | /* Make sure there is are no mixed devices */ |
133 | if (vm_dev->version == 2 && | |
134 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { | |
135 | dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); | |
136 | return -EINVAL; | |
137 | } | |
138 | ||
139 | writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); | |
140 | writel((u32)(vdev->features >> 32), | |
141 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
93d389f8 | 142 | |
1862ee22 PM |
143 | writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
144 | writel((u32)vdev->features, | |
145 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
5c609a5e MT |
146 | |
147 | return 0; | |
edfd52e6 PM |
148 | } |
149 | ||
150 | static void vm_get(struct virtio_device *vdev, unsigned offset, | |
151 | void *buf, unsigned len) | |
152 | { | |
153 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
154 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
155 | u8 b; | |
156 | __le16 w; | |
157 | __le32 l; | |
158 | ||
159 | if (vm_dev->version == 1) { | |
160 | u8 *ptr = buf; | |
161 | int i; | |
162 | ||
163 | for (i = 0; i < len; i++) | |
164 | ptr[i] = readb(base + offset + i); | |
165 | return; | |
166 | } | |
edfd52e6 | 167 | |
704a0b5f MT |
168 | switch (len) { |
169 | case 1: | |
170 | b = readb(base + offset); | |
171 | memcpy(buf, &b, sizeof b); | |
172 | break; | |
173 | case 2: | |
174 | w = cpu_to_le16(readw(base + offset)); | |
175 | memcpy(buf, &w, sizeof w); | |
176 | break; | |
177 | case 4: | |
178 | l = cpu_to_le32(readl(base + offset)); | |
179 | memcpy(buf, &l, sizeof l); | |
180 | break; | |
181 | case 8: | |
182 | l = cpu_to_le32(readl(base + offset)); | |
183 | memcpy(buf, &l, sizeof l); | |
184 | l = cpu_to_le32(ioread32(base + offset + sizeof l)); | |
185 | memcpy(buf + sizeof l, &l, sizeof l); | |
186 | break; | |
187 | default: | |
188 | BUG(); | |
189 | } | |
edfd52e6 PM |
190 | } |
191 | ||
192 | static void vm_set(struct virtio_device *vdev, unsigned offset, | |
193 | const void *buf, unsigned len) | |
194 | { | |
195 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
196 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
197 | u8 b; | |
198 | __le16 w; | |
199 | __le32 l; | |
200 | ||
201 | if (vm_dev->version == 1) { | |
202 | const u8 *ptr = buf; | |
203 | int i; | |
204 | ||
205 | for (i = 0; i < len; i++) | |
206 | writeb(ptr[i], base + offset + i); | |
edfd52e6 | 207 | |
704a0b5f MT |
208 | return; |
209 | } | |
210 | ||
211 | switch (len) { | |
212 | case 1: | |
213 | memcpy(&b, buf, sizeof b); | |
214 | writeb(b, base + offset); | |
215 | break; | |
216 | case 2: | |
217 | memcpy(&w, buf, sizeof w); | |
218 | writew(le16_to_cpu(w), base + offset); | |
219 | break; | |
220 | case 4: | |
221 | memcpy(&l, buf, sizeof l); | |
222 | writel(le32_to_cpu(l), base + offset); | |
223 | break; | |
224 | case 8: | |
225 | memcpy(&l, buf, sizeof l); | |
226 | writel(le32_to_cpu(l), base + offset); | |
227 | memcpy(&l, buf + sizeof l, sizeof l); | |
228 | writel(le32_to_cpu(l), base + offset + sizeof l); | |
229 | break; | |
230 | default: | |
231 | BUG(); | |
232 | } | |
edfd52e6 PM |
233 | } |
234 | ||
87e7bf14 MT |
235 | static u32 vm_generation(struct virtio_device *vdev) |
236 | { | |
237 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
238 | ||
239 | if (vm_dev->version == 1) | |
240 | return 0; | |
241 | else | |
242 | return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); | |
243 | } | |
244 | ||
edfd52e6 PM |
245 | static u8 vm_get_status(struct virtio_device *vdev) |
246 | { | |
247 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
248 | ||
249 | return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; | |
250 | } | |
251 | ||
252 | static void vm_set_status(struct virtio_device *vdev, u8 status) | |
253 | { | |
254 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
255 | ||
256 | /* We should never be setting status to 0. */ | |
257 | BUG_ON(status == 0); | |
258 | ||
259 | writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); | |
260 | } | |
261 | ||
262 | static void vm_reset(struct virtio_device *vdev) | |
263 | { | |
264 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
265 | ||
266 | /* 0 status means a reset. */ | |
267 | writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); | |
268 | } | |
269 | ||
270 | ||
271 | ||
272 | /* Transport interface */ | |
273 | ||
274 | /* the notify function used when creating a virt queue */ | |
46f9c2b9 | 275 | static bool vm_notify(struct virtqueue *vq) |
edfd52e6 PM |
276 | { |
277 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
edfd52e6 PM |
278 | |
279 | /* We write the queue's selector into the notification register to | |
280 | * signal the other end */ | |
06ca287d | 281 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
46f9c2b9 | 282 | return true; |
edfd52e6 PM |
283 | } |
284 | ||
285 | /* Notify all virtqueues on an interrupt. */ | |
286 | static irqreturn_t vm_interrupt(int irq, void *opaque) | |
287 | { | |
288 | struct virtio_mmio_device *vm_dev = opaque; | |
289 | struct virtio_mmio_vq_info *info; | |
edfd52e6 PM |
290 | unsigned long status; |
291 | unsigned long flags; | |
292 | irqreturn_t ret = IRQ_NONE; | |
293 | ||
294 | /* Read and acknowledge interrupts */ | |
295 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); | |
296 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); | |
297 | ||
016c98c6 MT |
298 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { |
299 | virtio_config_changed(&vm_dev->vdev); | |
edfd52e6 PM |
300 | ret = IRQ_HANDLED; |
301 | } | |
302 | ||
303 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { | |
304 | spin_lock_irqsave(&vm_dev->lock, flags); | |
305 | list_for_each_entry(info, &vm_dev->virtqueues, node) | |
306 | ret |= vring_interrupt(irq, info->vq); | |
307 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
308 | } | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
313 | ||
314 | ||
315 | static void vm_del_vq(struct virtqueue *vq) | |
316 | { | |
317 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
318 | struct virtio_mmio_vq_info *info = vq->priv; | |
b4211138 | 319 | unsigned long flags; |
06ca287d | 320 | unsigned int index = vq->index; |
edfd52e6 PM |
321 | |
322 | spin_lock_irqsave(&vm_dev->lock, flags); | |
323 | list_del(&info->node); | |
324 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
325 | ||
edfd52e6 | 326 | /* Select and deactivate the queue */ |
17bb6d40 | 327 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
1862ee22 PM |
328 | if (vm_dev->version == 1) { |
329 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
330 | } else { | |
331 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
332 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
333 | } | |
edfd52e6 | 334 | |
b4211138 AL |
335 | vring_del_virtqueue(vq); |
336 | ||
edfd52e6 PM |
337 | kfree(info); |
338 | } | |
339 | ||
340 | static void vm_del_vqs(struct virtio_device *vdev) | |
341 | { | |
342 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
343 | struct virtqueue *vq, *n; | |
344 | ||
345 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
346 | vm_del_vq(vq); | |
347 | ||
348 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); | |
349 | } | |
350 | ||
edfd52e6 PM |
351 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, |
352 | void (*callback)(struct virtqueue *vq), | |
353 | const char *name) | |
354 | { | |
355 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
356 | struct virtio_mmio_vq_info *info; | |
357 | struct virtqueue *vq; | |
b4211138 AL |
358 | unsigned long flags; |
359 | unsigned int num; | |
edfd52e6 PM |
360 | int err; |
361 | ||
6457f126 MT |
362 | if (!name) |
363 | return NULL; | |
364 | ||
edfd52e6 PM |
365 | /* Select the queue we're interested in */ |
366 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); | |
367 | ||
368 | /* Queue shouldn't already be set up. */ | |
1862ee22 PM |
369 | if (readl(vm_dev->base + (vm_dev->version == 1 ? |
370 | VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { | |
edfd52e6 PM |
371 | err = -ENOENT; |
372 | goto error_available; | |
373 | } | |
374 | ||
375 | /* Allocate and fill out our active queue description */ | |
376 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
377 | if (!info) { | |
378 | err = -ENOMEM; | |
379 | goto error_kmalloc; | |
380 | } | |
edfd52e6 | 381 | |
b4211138 AL |
382 | num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); |
383 | if (num == 0) { | |
d78b519f | 384 | err = -ENOENT; |
b4211138 | 385 | goto error_new_virtqueue; |
edfd52e6 PM |
386 | } |
387 | ||
edfd52e6 | 388 | /* Create the vring */ |
b4211138 AL |
389 | vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
390 | true, true, vm_notify, callback, name); | |
edfd52e6 PM |
391 | if (!vq) { |
392 | err = -ENOMEM; | |
393 | goto error_new_virtqueue; | |
394 | } | |
395 | ||
1862ee22 | 396 | /* Activate the queue */ |
b4211138 | 397 | writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); |
1862ee22 PM |
398 | if (vm_dev->version == 1) { |
399 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); | |
b4211138 | 400 | writel(virtqueue_get_desc_addr(vq) >> PAGE_SHIFT, |
1862ee22 PM |
401 | vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
402 | } else { | |
403 | u64 addr; | |
404 | ||
b4211138 | 405 | addr = virtqueue_get_desc_addr(vq); |
1862ee22 PM |
406 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); |
407 | writel((u32)(addr >> 32), | |
408 | vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); | |
409 | ||
b4211138 | 410 | addr = virtqueue_get_avail_addr(vq); |
1862ee22 PM |
411 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); |
412 | writel((u32)(addr >> 32), | |
413 | vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); | |
414 | ||
b4211138 | 415 | addr = virtqueue_get_used_addr(vq); |
1862ee22 PM |
416 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); |
417 | writel((u32)(addr >> 32), | |
418 | vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); | |
419 | ||
420 | writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
421 | } | |
422 | ||
edfd52e6 PM |
423 | vq->priv = info; |
424 | info->vq = vq; | |
425 | ||
426 | spin_lock_irqsave(&vm_dev->lock, flags); | |
427 | list_add(&info->node, &vm_dev->virtqueues); | |
428 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
429 | ||
430 | return vq; | |
431 | ||
432 | error_new_virtqueue: | |
1862ee22 PM |
433 | if (vm_dev->version == 1) { |
434 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
435 | } else { | |
436 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
437 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
438 | } | |
edfd52e6 PM |
439 | kfree(info); |
440 | error_kmalloc: | |
441 | error_available: | |
442 | return ERR_PTR(err); | |
443 | } | |
444 | ||
445 | static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, | |
446 | struct virtqueue *vqs[], | |
447 | vq_callback_t *callbacks[], | |
f7ad26ff | 448 | const char * const names[]) |
edfd52e6 PM |
449 | { |
450 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
451 | unsigned int irq = platform_get_irq(vm_dev->pdev, 0); | |
452 | int i, err; | |
453 | ||
454 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, | |
455 | dev_name(&vdev->dev), vm_dev); | |
456 | if (err) | |
457 | return err; | |
458 | ||
459 | for (i = 0; i < nvqs; ++i) { | |
460 | vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]); | |
461 | if (IS_ERR(vqs[i])) { | |
462 | vm_del_vqs(vdev); | |
463 | return PTR_ERR(vqs[i]); | |
464 | } | |
465 | } | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
66846048 RJ |
470 | static const char *vm_bus_name(struct virtio_device *vdev) |
471 | { | |
472 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 | 473 | |
66846048 RJ |
474 | return vm_dev->pdev->name; |
475 | } | |
edfd52e6 | 476 | |
93503932 | 477 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
edfd52e6 PM |
478 | .get = vm_get, |
479 | .set = vm_set, | |
87e7bf14 | 480 | .generation = vm_generation, |
edfd52e6 PM |
481 | .get_status = vm_get_status, |
482 | .set_status = vm_set_status, | |
483 | .reset = vm_reset, | |
484 | .find_vqs = vm_find_vqs, | |
485 | .del_vqs = vm_del_vqs, | |
486 | .get_features = vm_get_features, | |
487 | .finalize_features = vm_finalize_features, | |
66846048 | 488 | .bus_name = vm_bus_name, |
edfd52e6 PM |
489 | }; |
490 | ||
491 | ||
492 | ||
493 | /* Platform device */ | |
494 | ||
8590dbc7 | 495 | static int virtio_mmio_probe(struct platform_device *pdev) |
edfd52e6 PM |
496 | { |
497 | struct virtio_mmio_device *vm_dev; | |
498 | struct resource *mem; | |
499 | unsigned long magic; | |
500 | ||
501 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
502 | if (!mem) | |
503 | return -EINVAL; | |
504 | ||
505 | if (!devm_request_mem_region(&pdev->dev, mem->start, | |
506 | resource_size(mem), pdev->name)) | |
507 | return -EBUSY; | |
508 | ||
509 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); | |
510 | if (!vm_dev) | |
511 | return -ENOMEM; | |
512 | ||
513 | vm_dev->vdev.dev.parent = &pdev->dev; | |
514 | vm_dev->vdev.config = &virtio_mmio_config_ops; | |
515 | vm_dev->pdev = pdev; | |
516 | INIT_LIST_HEAD(&vm_dev->virtqueues); | |
517 | spin_lock_init(&vm_dev->lock); | |
518 | ||
519 | vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); | |
520 | if (vm_dev->base == NULL) | |
521 | return -EFAULT; | |
522 | ||
523 | /* Check magic value */ | |
524 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); | |
4ae85370 | 525 | if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
edfd52e6 PM |
526 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
527 | return -ENODEV; | |
528 | } | |
529 | ||
530 | /* Check device version */ | |
531 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); | |
1862ee22 | 532 | if (vm_dev->version < 1 || vm_dev->version > 2) { |
edfd52e6 PM |
533 | dev_err(&pdev->dev, "Version %ld not supported!\n", |
534 | vm_dev->version); | |
535 | return -ENXIO; | |
536 | } | |
537 | ||
538 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); | |
1862ee22 PM |
539 | if (vm_dev->vdev.id.device == 0) { |
540 | /* | |
541 | * virtio-mmio device with an ID 0 is a (dummy) placeholder | |
542 | * with no function. End probing now with no error reported. | |
543 | */ | |
544 | return -ENODEV; | |
545 | } | |
edfd52e6 PM |
546 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
547 | ||
1862ee22 PM |
548 | if (vm_dev->version == 1) |
549 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); | |
edfd52e6 PM |
550 | |
551 | platform_set_drvdata(pdev, vm_dev); | |
552 | ||
553 | return register_virtio_device(&vm_dev->vdev); | |
554 | } | |
555 | ||
8590dbc7 | 556 | static int virtio_mmio_remove(struct platform_device *pdev) |
edfd52e6 PM |
557 | { |
558 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); | |
559 | ||
560 | unregister_virtio_device(&vm_dev->vdev); | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
565 | ||
566 | ||
81a054ce PM |
567 | /* Devices list parameter */ |
568 | ||
569 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) | |
570 | ||
571 | static struct device vm_cmdline_parent = { | |
572 | .init_name = "virtio-mmio-cmdline", | |
573 | }; | |
574 | ||
575 | static int vm_cmdline_parent_registered; | |
576 | static int vm_cmdline_id; | |
577 | ||
578 | static int vm_cmdline_set(const char *device, | |
579 | const struct kernel_param *kp) | |
580 | { | |
581 | int err; | |
582 | struct resource resources[2] = {}; | |
583 | char *str; | |
40f9938c PM |
584 | long long int base, size; |
585 | unsigned int irq; | |
81a054ce PM |
586 | int processed, consumed = 0; |
587 | struct platform_device *pdev; | |
588 | ||
40f9938c PM |
589 | /* Consume "size" part of the command line parameter */ |
590 | size = memparse(device, &str); | |
81a054ce | 591 | |
40f9938c | 592 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
81a054ce | 593 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
40f9938c | 594 | &base, &irq, &consumed, |
81a054ce PM |
595 | &vm_cmdline_id, &consumed); |
596 | ||
40f9938c PM |
597 | /* |
598 | * sscanf() must processes at least 2 chunks; also there | |
599 | * must be no extra characters after the last chunk, so | |
600 | * str[consumed] must be '\0' | |
601 | */ | |
602 | if (processed < 2 || str[consumed]) | |
81a054ce PM |
603 | return -EINVAL; |
604 | ||
40f9938c | 605 | resources[0].flags = IORESOURCE_MEM; |
81a054ce | 606 | resources[0].start = base; |
40f9938c PM |
607 | resources[0].end = base + size - 1; |
608 | ||
609 | resources[1].flags = IORESOURCE_IRQ; | |
610 | resources[1].start = resources[1].end = irq; | |
81a054ce PM |
611 | |
612 | if (!vm_cmdline_parent_registered) { | |
613 | err = device_register(&vm_cmdline_parent); | |
614 | if (err) { | |
615 | pr_err("Failed to register parent device!\n"); | |
616 | return err; | |
617 | } | |
618 | vm_cmdline_parent_registered = 1; | |
619 | } | |
620 | ||
621 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", | |
622 | vm_cmdline_id, | |
623 | (unsigned long long)resources[0].start, | |
624 | (unsigned long long)resources[0].end, | |
625 | (int)resources[1].start); | |
626 | ||
627 | pdev = platform_device_register_resndata(&vm_cmdline_parent, | |
628 | "virtio-mmio", vm_cmdline_id++, | |
629 | resources, ARRAY_SIZE(resources), NULL, 0); | |
630 | if (IS_ERR(pdev)) | |
631 | return PTR_ERR(pdev); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | static int vm_cmdline_get_device(struct device *dev, void *data) | |
637 | { | |
638 | char *buffer = data; | |
639 | unsigned int len = strlen(buffer); | |
640 | struct platform_device *pdev = to_platform_device(dev); | |
641 | ||
642 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", | |
643 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, | |
644 | (unsigned long long)pdev->resource[0].start, | |
645 | (unsigned long long)pdev->resource[1].start, | |
646 | pdev->id); | |
647 | return 0; | |
648 | } | |
649 | ||
650 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) | |
651 | { | |
652 | buffer[0] = '\0'; | |
653 | device_for_each_child(&vm_cmdline_parent, buffer, | |
654 | vm_cmdline_get_device); | |
655 | return strlen(buffer) + 1; | |
656 | } | |
657 | ||
9c27847d | 658 | static const struct kernel_param_ops vm_cmdline_param_ops = { |
81a054ce PM |
659 | .set = vm_cmdline_set, |
660 | .get = vm_cmdline_get, | |
661 | }; | |
662 | ||
663 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); | |
664 | ||
665 | static int vm_unregister_cmdline_device(struct device *dev, | |
666 | void *data) | |
667 | { | |
668 | platform_device_unregister(to_platform_device(dev)); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static void vm_unregister_cmdline_devices(void) | |
674 | { | |
675 | if (vm_cmdline_parent_registered) { | |
676 | device_for_each_child(&vm_cmdline_parent, NULL, | |
677 | vm_unregister_cmdline_device); | |
678 | device_unregister(&vm_cmdline_parent); | |
679 | vm_cmdline_parent_registered = 0; | |
680 | } | |
681 | } | |
682 | ||
683 | #else | |
684 | ||
685 | static void vm_unregister_cmdline_devices(void) | |
686 | { | |
687 | } | |
688 | ||
689 | #endif | |
690 | ||
edfd52e6 PM |
691 | /* Platform driver */ |
692 | ||
693 | static struct of_device_id virtio_mmio_match[] = { | |
694 | { .compatible = "virtio,mmio", }, | |
695 | {}, | |
696 | }; | |
697 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); | |
698 | ||
38c4ab8e GG |
699 | #ifdef CONFIG_ACPI |
700 | static const struct acpi_device_id virtio_mmio_acpi_match[] = { | |
701 | { "LNRO0005", }, | |
702 | { } | |
703 | }; | |
704 | MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); | |
705 | #endif | |
706 | ||
edfd52e6 PM |
707 | static struct platform_driver virtio_mmio_driver = { |
708 | .probe = virtio_mmio_probe, | |
8590dbc7 | 709 | .remove = virtio_mmio_remove, |
edfd52e6 PM |
710 | .driver = { |
711 | .name = "virtio-mmio", | |
edfd52e6 | 712 | .of_match_table = virtio_mmio_match, |
38c4ab8e | 713 | .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), |
edfd52e6 PM |
714 | }, |
715 | }; | |
716 | ||
717 | static int __init virtio_mmio_init(void) | |
718 | { | |
719 | return platform_driver_register(&virtio_mmio_driver); | |
720 | } | |
721 | ||
722 | static void __exit virtio_mmio_exit(void) | |
723 | { | |
724 | platform_driver_unregister(&virtio_mmio_driver); | |
81a054ce | 725 | vm_unregister_cmdline_devices(); |
edfd52e6 PM |
726 | } |
727 | ||
728 | module_init(virtio_mmio_init); | |
729 | module_exit(virtio_mmio_exit); | |
730 | ||
731 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
732 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); | |
733 | MODULE_LICENSE("GPL"); |