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> |
f7f6634d | 62 | #include <linux/dma-mapping.h> |
edfd52e6 PM |
63 | #include <linux/highmem.h> |
64 | #include <linux/interrupt.h> | |
65 | #include <linux/io.h> | |
66 | #include <linux/list.h> | |
67 | #include <linux/module.h> | |
68 | #include <linux/platform_device.h> | |
69 | #include <linux/slab.h> | |
70 | #include <linux/spinlock.h> | |
71 | #include <linux/virtio.h> | |
72 | #include <linux/virtio_config.h> | |
73 | #include <linux/virtio_mmio.h> | |
74 | #include <linux/virtio_ring.h> | |
75 | ||
76 | ||
77 | ||
78 | /* The alignment to use between consumer and producer parts of vring. | |
79 | * Currently hardcoded to the page size. */ | |
80 | #define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE | |
81 | ||
82 | ||
83 | ||
84 | #define to_virtio_mmio_device(_plat_dev) \ | |
85 | container_of(_plat_dev, struct virtio_mmio_device, vdev) | |
86 | ||
87 | struct virtio_mmio_device { | |
88 | struct virtio_device vdev; | |
89 | struct platform_device *pdev; | |
90 | ||
91 | void __iomem *base; | |
92 | unsigned long version; | |
93 | ||
94 | /* a list of queues so we can dispatch IRQs */ | |
95 | spinlock_t lock; | |
96 | struct list_head virtqueues; | |
97 | }; | |
98 | ||
99 | struct virtio_mmio_vq_info { | |
100 | /* the actual virtqueue */ | |
101 | struct virtqueue *vq; | |
102 | ||
edfd52e6 PM |
103 | /* the list node for the virtqueues list */ |
104 | struct list_head node; | |
105 | }; | |
106 | ||
107 | ||
108 | ||
109 | /* Configuration interface */ | |
110 | ||
d0254773 | 111 | static u64 vm_get_features(struct virtio_device *vdev) |
edfd52e6 PM |
112 | { |
113 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
1862ee22 PM |
114 | u64 features; |
115 | ||
116 | writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); | |
117 | features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
118 | features <<= 32; | |
edfd52e6 | 119 | |
1862ee22 PM |
120 | writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
121 | features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
edfd52e6 | 122 | |
1862ee22 | 123 | return features; |
edfd52e6 PM |
124 | } |
125 | ||
5c609a5e | 126 | static int vm_finalize_features(struct virtio_device *vdev) |
edfd52e6 PM |
127 | { |
128 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 PM |
129 | |
130 | /* Give virtio_ring a chance to accept features. */ | |
131 | vring_transport_features(vdev); | |
132 | ||
1862ee22 PM |
133 | /* Make sure there is are no mixed devices */ |
134 | if (vm_dev->version == 2 && | |
135 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { | |
136 | dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); | |
137 | return -EINVAL; | |
138 | } | |
139 | ||
140 | writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); | |
141 | writel((u32)(vdev->features >> 32), | |
142 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
93d389f8 | 143 | |
1862ee22 PM |
144 | writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
145 | writel((u32)vdev->features, | |
146 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
5c609a5e MT |
147 | |
148 | return 0; | |
edfd52e6 PM |
149 | } |
150 | ||
151 | static void vm_get(struct virtio_device *vdev, unsigned offset, | |
152 | void *buf, unsigned len) | |
153 | { | |
154 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
155 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
156 | u8 b; | |
157 | __le16 w; | |
158 | __le32 l; | |
159 | ||
160 | if (vm_dev->version == 1) { | |
161 | u8 *ptr = buf; | |
162 | int i; | |
163 | ||
164 | for (i = 0; i < len; i++) | |
165 | ptr[i] = readb(base + offset + i); | |
166 | return; | |
167 | } | |
edfd52e6 | 168 | |
704a0b5f MT |
169 | switch (len) { |
170 | case 1: | |
171 | b = readb(base + offset); | |
172 | memcpy(buf, &b, sizeof b); | |
173 | break; | |
174 | case 2: | |
175 | w = cpu_to_le16(readw(base + offset)); | |
176 | memcpy(buf, &w, sizeof w); | |
177 | break; | |
178 | case 4: | |
179 | l = cpu_to_le32(readl(base + offset)); | |
180 | memcpy(buf, &l, sizeof l); | |
181 | break; | |
182 | case 8: | |
183 | l = cpu_to_le32(readl(base + offset)); | |
184 | memcpy(buf, &l, sizeof l); | |
185 | l = cpu_to_le32(ioread32(base + offset + sizeof l)); | |
186 | memcpy(buf + sizeof l, &l, sizeof l); | |
187 | break; | |
188 | default: | |
189 | BUG(); | |
190 | } | |
edfd52e6 PM |
191 | } |
192 | ||
193 | static void vm_set(struct virtio_device *vdev, unsigned offset, | |
194 | const void *buf, unsigned len) | |
195 | { | |
196 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
197 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
198 | u8 b; | |
199 | __le16 w; | |
200 | __le32 l; | |
201 | ||
202 | if (vm_dev->version == 1) { | |
203 | const u8 *ptr = buf; | |
204 | int i; | |
205 | ||
206 | for (i = 0; i < len; i++) | |
207 | writeb(ptr[i], base + offset + i); | |
edfd52e6 | 208 | |
704a0b5f MT |
209 | return; |
210 | } | |
211 | ||
212 | switch (len) { | |
213 | case 1: | |
214 | memcpy(&b, buf, sizeof b); | |
215 | writeb(b, base + offset); | |
216 | break; | |
217 | case 2: | |
218 | memcpy(&w, buf, sizeof w); | |
219 | writew(le16_to_cpu(w), base + offset); | |
220 | break; | |
221 | case 4: | |
222 | memcpy(&l, buf, sizeof l); | |
223 | writel(le32_to_cpu(l), base + offset); | |
224 | break; | |
225 | case 8: | |
226 | memcpy(&l, buf, sizeof l); | |
227 | writel(le32_to_cpu(l), base + offset); | |
228 | memcpy(&l, buf + sizeof l, sizeof l); | |
229 | writel(le32_to_cpu(l), base + offset + sizeof l); | |
230 | break; | |
231 | default: | |
232 | BUG(); | |
233 | } | |
edfd52e6 PM |
234 | } |
235 | ||
87e7bf14 MT |
236 | static u32 vm_generation(struct virtio_device *vdev) |
237 | { | |
238 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
239 | ||
240 | if (vm_dev->version == 1) | |
241 | return 0; | |
242 | else | |
243 | return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); | |
244 | } | |
245 | ||
edfd52e6 PM |
246 | static u8 vm_get_status(struct virtio_device *vdev) |
247 | { | |
248 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
249 | ||
250 | return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; | |
251 | } | |
252 | ||
253 | static void vm_set_status(struct virtio_device *vdev, u8 status) | |
254 | { | |
255 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
256 | ||
257 | /* We should never be setting status to 0. */ | |
258 | BUG_ON(status == 0); | |
259 | ||
260 | writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); | |
261 | } | |
262 | ||
263 | static void vm_reset(struct virtio_device *vdev) | |
264 | { | |
265 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
266 | ||
267 | /* 0 status means a reset. */ | |
268 | writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); | |
269 | } | |
270 | ||
271 | ||
272 | ||
273 | /* Transport interface */ | |
274 | ||
275 | /* the notify function used when creating a virt queue */ | |
46f9c2b9 | 276 | static bool vm_notify(struct virtqueue *vq) |
edfd52e6 PM |
277 | { |
278 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
edfd52e6 PM |
279 | |
280 | /* We write the queue's selector into the notification register to | |
281 | * signal the other end */ | |
06ca287d | 282 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
46f9c2b9 | 283 | return true; |
edfd52e6 PM |
284 | } |
285 | ||
286 | /* Notify all virtqueues on an interrupt. */ | |
287 | static irqreturn_t vm_interrupt(int irq, void *opaque) | |
288 | { | |
289 | struct virtio_mmio_device *vm_dev = opaque; | |
290 | struct virtio_mmio_vq_info *info; | |
edfd52e6 PM |
291 | unsigned long status; |
292 | unsigned long flags; | |
293 | irqreturn_t ret = IRQ_NONE; | |
294 | ||
295 | /* Read and acknowledge interrupts */ | |
296 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); | |
297 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); | |
298 | ||
016c98c6 MT |
299 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { |
300 | virtio_config_changed(&vm_dev->vdev); | |
edfd52e6 PM |
301 | ret = IRQ_HANDLED; |
302 | } | |
303 | ||
304 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { | |
305 | spin_lock_irqsave(&vm_dev->lock, flags); | |
306 | list_for_each_entry(info, &vm_dev->virtqueues, node) | |
307 | ret |= vring_interrupt(irq, info->vq); | |
308 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
309 | } | |
310 | ||
311 | return ret; | |
312 | } | |
313 | ||
314 | ||
315 | ||
316 | static void vm_del_vq(struct virtqueue *vq) | |
317 | { | |
318 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
319 | struct virtio_mmio_vq_info *info = vq->priv; | |
b4211138 | 320 | unsigned long flags; |
06ca287d | 321 | unsigned int index = vq->index; |
edfd52e6 PM |
322 | |
323 | spin_lock_irqsave(&vm_dev->lock, flags); | |
324 | list_del(&info->node); | |
325 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
326 | ||
edfd52e6 | 327 | /* Select and deactivate the queue */ |
17bb6d40 | 328 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
1862ee22 PM |
329 | if (vm_dev->version == 1) { |
330 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
331 | } else { | |
332 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
333 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
334 | } | |
edfd52e6 | 335 | |
b4211138 AL |
336 | vring_del_virtqueue(vq); |
337 | ||
edfd52e6 PM |
338 | kfree(info); |
339 | } | |
340 | ||
341 | static void vm_del_vqs(struct virtio_device *vdev) | |
342 | { | |
343 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
344 | struct virtqueue *vq, *n; | |
345 | ||
346 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
347 | vm_del_vq(vq); | |
348 | ||
349 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); | |
350 | } | |
351 | ||
edfd52e6 PM |
352 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, |
353 | void (*callback)(struct virtqueue *vq), | |
354 | const char *name) | |
355 | { | |
356 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
357 | struct virtio_mmio_vq_info *info; | |
358 | struct virtqueue *vq; | |
b4211138 AL |
359 | unsigned long flags; |
360 | unsigned int num; | |
edfd52e6 PM |
361 | int err; |
362 | ||
6457f126 MT |
363 | if (!name) |
364 | return NULL; | |
365 | ||
edfd52e6 PM |
366 | /* Select the queue we're interested in */ |
367 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); | |
368 | ||
369 | /* Queue shouldn't already be set up. */ | |
1862ee22 PM |
370 | if (readl(vm_dev->base + (vm_dev->version == 1 ? |
371 | VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { | |
edfd52e6 PM |
372 | err = -ENOENT; |
373 | goto error_available; | |
374 | } | |
375 | ||
376 | /* Allocate and fill out our active queue description */ | |
377 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
378 | if (!info) { | |
379 | err = -ENOMEM; | |
380 | goto error_kmalloc; | |
381 | } | |
edfd52e6 | 382 | |
b4211138 AL |
383 | num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); |
384 | if (num == 0) { | |
d78b519f | 385 | err = -ENOENT; |
b4211138 | 386 | goto error_new_virtqueue; |
edfd52e6 PM |
387 | } |
388 | ||
edfd52e6 | 389 | /* Create the vring */ |
b4211138 AL |
390 | vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
391 | true, true, vm_notify, callback, name); | |
edfd52e6 PM |
392 | if (!vq) { |
393 | err = -ENOMEM; | |
394 | goto error_new_virtqueue; | |
395 | } | |
396 | ||
1862ee22 | 397 | /* Activate the queue */ |
b4211138 | 398 | writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); |
1862ee22 PM |
399 | if (vm_dev->version == 1) { |
400 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); | |
b4211138 | 401 | writel(virtqueue_get_desc_addr(vq) >> PAGE_SHIFT, |
1862ee22 PM |
402 | vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
403 | } else { | |
404 | u64 addr; | |
405 | ||
b4211138 | 406 | addr = virtqueue_get_desc_addr(vq); |
1862ee22 PM |
407 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); |
408 | writel((u32)(addr >> 32), | |
409 | vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); | |
410 | ||
b4211138 | 411 | addr = virtqueue_get_avail_addr(vq); |
1862ee22 PM |
412 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); |
413 | writel((u32)(addr >> 32), | |
414 | vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); | |
415 | ||
b4211138 | 416 | addr = virtqueue_get_used_addr(vq); |
1862ee22 PM |
417 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); |
418 | writel((u32)(addr >> 32), | |
419 | vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); | |
420 | ||
421 | writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
422 | } | |
423 | ||
edfd52e6 PM |
424 | vq->priv = info; |
425 | info->vq = vq; | |
426 | ||
427 | spin_lock_irqsave(&vm_dev->lock, flags); | |
428 | list_add(&info->node, &vm_dev->virtqueues); | |
429 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
430 | ||
431 | return vq; | |
432 | ||
433 | error_new_virtqueue: | |
1862ee22 PM |
434 | if (vm_dev->version == 1) { |
435 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
436 | } else { | |
437 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
438 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
439 | } | |
edfd52e6 PM |
440 | kfree(info); |
441 | error_kmalloc: | |
442 | error_available: | |
443 | return ERR_PTR(err); | |
444 | } | |
445 | ||
446 | static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, | |
447 | struct virtqueue *vqs[], | |
448 | vq_callback_t *callbacks[], | |
f7ad26ff | 449 | const char * const names[]) |
edfd52e6 PM |
450 | { |
451 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
452 | unsigned int irq = platform_get_irq(vm_dev->pdev, 0); | |
453 | int i, err; | |
454 | ||
455 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, | |
456 | dev_name(&vdev->dev), vm_dev); | |
457 | if (err) | |
458 | return err; | |
459 | ||
460 | for (i = 0; i < nvqs; ++i) { | |
461 | vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]); | |
462 | if (IS_ERR(vqs[i])) { | |
463 | vm_del_vqs(vdev); | |
464 | return PTR_ERR(vqs[i]); | |
465 | } | |
466 | } | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
66846048 RJ |
471 | static const char *vm_bus_name(struct virtio_device *vdev) |
472 | { | |
473 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 | 474 | |
66846048 RJ |
475 | return vm_dev->pdev->name; |
476 | } | |
edfd52e6 | 477 | |
93503932 | 478 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
edfd52e6 PM |
479 | .get = vm_get, |
480 | .set = vm_set, | |
87e7bf14 | 481 | .generation = vm_generation, |
edfd52e6 PM |
482 | .get_status = vm_get_status, |
483 | .set_status = vm_set_status, | |
484 | .reset = vm_reset, | |
485 | .find_vqs = vm_find_vqs, | |
486 | .del_vqs = vm_del_vqs, | |
487 | .get_features = vm_get_features, | |
488 | .finalize_features = vm_finalize_features, | |
66846048 | 489 | .bus_name = vm_bus_name, |
edfd52e6 PM |
490 | }; |
491 | ||
492 | ||
cecdbdc3 | 493 | static void virtio_mmio_release_dev_empty(struct device *_d) {} |
edfd52e6 PM |
494 | |
495 | /* Platform device */ | |
496 | ||
8590dbc7 | 497 | static int virtio_mmio_probe(struct platform_device *pdev) |
edfd52e6 PM |
498 | { |
499 | struct virtio_mmio_device *vm_dev; | |
500 | struct resource *mem; | |
501 | unsigned long magic; | |
f7f6634d | 502 | int rc; |
edfd52e6 PM |
503 | |
504 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
505 | if (!mem) | |
506 | return -EINVAL; | |
507 | ||
508 | if (!devm_request_mem_region(&pdev->dev, mem->start, | |
509 | resource_size(mem), pdev->name)) | |
510 | return -EBUSY; | |
511 | ||
512 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); | |
513 | if (!vm_dev) | |
514 | return -ENOMEM; | |
515 | ||
516 | vm_dev->vdev.dev.parent = &pdev->dev; | |
cecdbdc3 | 517 | vm_dev->vdev.dev.release = virtio_mmio_release_dev_empty; |
edfd52e6 PM |
518 | vm_dev->vdev.config = &virtio_mmio_config_ops; |
519 | vm_dev->pdev = pdev; | |
520 | INIT_LIST_HEAD(&vm_dev->virtqueues); | |
521 | spin_lock_init(&vm_dev->lock); | |
522 | ||
523 | vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); | |
524 | if (vm_dev->base == NULL) | |
525 | return -EFAULT; | |
526 | ||
527 | /* Check magic value */ | |
528 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); | |
4ae85370 | 529 | if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
edfd52e6 PM |
530 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
531 | return -ENODEV; | |
532 | } | |
533 | ||
534 | /* Check device version */ | |
535 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); | |
1862ee22 | 536 | if (vm_dev->version < 1 || vm_dev->version > 2) { |
edfd52e6 PM |
537 | dev_err(&pdev->dev, "Version %ld not supported!\n", |
538 | vm_dev->version); | |
539 | return -ENXIO; | |
540 | } | |
541 | ||
542 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); | |
1862ee22 PM |
543 | if (vm_dev->vdev.id.device == 0) { |
544 | /* | |
545 | * virtio-mmio device with an ID 0 is a (dummy) placeholder | |
546 | * with no function. End probing now with no error reported. | |
547 | */ | |
548 | return -ENODEV; | |
549 | } | |
edfd52e6 PM |
550 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
551 | ||
f7f6634d | 552 | if (vm_dev->version == 1) { |
1862ee22 | 553 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); |
edfd52e6 | 554 | |
f7f6634d RM |
555 | rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); |
556 | /* | |
557 | * In the legacy case, ensure our coherently-allocated virtio | |
558 | * ring will be at an address expressable as a 32-bit PFN. | |
559 | */ | |
560 | if (!rc) | |
561 | dma_set_coherent_mask(&pdev->dev, | |
562 | DMA_BIT_MASK(32 + PAGE_SHIFT)); | |
563 | } else { | |
564 | rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); | |
565 | } | |
566 | if (rc) | |
567 | rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); | |
568 | if (rc) | |
569 | dev_warn(&pdev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); | |
570 | ||
edfd52e6 PM |
571 | platform_set_drvdata(pdev, vm_dev); |
572 | ||
573 | return register_virtio_device(&vm_dev->vdev); | |
574 | } | |
575 | ||
8590dbc7 | 576 | static int virtio_mmio_remove(struct platform_device *pdev) |
edfd52e6 PM |
577 | { |
578 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); | |
579 | ||
580 | unregister_virtio_device(&vm_dev->vdev); | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | ||
586 | ||
81a054ce PM |
587 | /* Devices list parameter */ |
588 | ||
589 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) | |
590 | ||
591 | static struct device vm_cmdline_parent = { | |
592 | .init_name = "virtio-mmio-cmdline", | |
593 | }; | |
594 | ||
595 | static int vm_cmdline_parent_registered; | |
596 | static int vm_cmdline_id; | |
597 | ||
598 | static int vm_cmdline_set(const char *device, | |
599 | const struct kernel_param *kp) | |
600 | { | |
601 | int err; | |
602 | struct resource resources[2] = {}; | |
603 | char *str; | |
40f9938c PM |
604 | long long int base, size; |
605 | unsigned int irq; | |
81a054ce PM |
606 | int processed, consumed = 0; |
607 | struct platform_device *pdev; | |
608 | ||
40f9938c PM |
609 | /* Consume "size" part of the command line parameter */ |
610 | size = memparse(device, &str); | |
81a054ce | 611 | |
40f9938c | 612 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
81a054ce | 613 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
40f9938c | 614 | &base, &irq, &consumed, |
81a054ce PM |
615 | &vm_cmdline_id, &consumed); |
616 | ||
40f9938c PM |
617 | /* |
618 | * sscanf() must processes at least 2 chunks; also there | |
619 | * must be no extra characters after the last chunk, so | |
620 | * str[consumed] must be '\0' | |
621 | */ | |
622 | if (processed < 2 || str[consumed]) | |
81a054ce PM |
623 | return -EINVAL; |
624 | ||
40f9938c | 625 | resources[0].flags = IORESOURCE_MEM; |
81a054ce | 626 | resources[0].start = base; |
40f9938c PM |
627 | resources[0].end = base + size - 1; |
628 | ||
629 | resources[1].flags = IORESOURCE_IRQ; | |
630 | resources[1].start = resources[1].end = irq; | |
81a054ce PM |
631 | |
632 | if (!vm_cmdline_parent_registered) { | |
633 | err = device_register(&vm_cmdline_parent); | |
634 | if (err) { | |
635 | pr_err("Failed to register parent device!\n"); | |
636 | return err; | |
637 | } | |
638 | vm_cmdline_parent_registered = 1; | |
639 | } | |
640 | ||
641 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", | |
642 | vm_cmdline_id, | |
643 | (unsigned long long)resources[0].start, | |
644 | (unsigned long long)resources[0].end, | |
645 | (int)resources[1].start); | |
646 | ||
647 | pdev = platform_device_register_resndata(&vm_cmdline_parent, | |
648 | "virtio-mmio", vm_cmdline_id++, | |
649 | resources, ARRAY_SIZE(resources), NULL, 0); | |
650 | if (IS_ERR(pdev)) | |
651 | return PTR_ERR(pdev); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | static int vm_cmdline_get_device(struct device *dev, void *data) | |
657 | { | |
658 | char *buffer = data; | |
659 | unsigned int len = strlen(buffer); | |
660 | struct platform_device *pdev = to_platform_device(dev); | |
661 | ||
662 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", | |
663 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, | |
664 | (unsigned long long)pdev->resource[0].start, | |
665 | (unsigned long long)pdev->resource[1].start, | |
666 | pdev->id); | |
667 | return 0; | |
668 | } | |
669 | ||
670 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) | |
671 | { | |
672 | buffer[0] = '\0'; | |
673 | device_for_each_child(&vm_cmdline_parent, buffer, | |
674 | vm_cmdline_get_device); | |
675 | return strlen(buffer) + 1; | |
676 | } | |
677 | ||
9c27847d | 678 | static const struct kernel_param_ops vm_cmdline_param_ops = { |
81a054ce PM |
679 | .set = vm_cmdline_set, |
680 | .get = vm_cmdline_get, | |
681 | }; | |
682 | ||
683 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); | |
684 | ||
685 | static int vm_unregister_cmdline_device(struct device *dev, | |
686 | void *data) | |
687 | { | |
688 | platform_device_unregister(to_platform_device(dev)); | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | static void vm_unregister_cmdline_devices(void) | |
694 | { | |
695 | if (vm_cmdline_parent_registered) { | |
696 | device_for_each_child(&vm_cmdline_parent, NULL, | |
697 | vm_unregister_cmdline_device); | |
698 | device_unregister(&vm_cmdline_parent); | |
699 | vm_cmdline_parent_registered = 0; | |
700 | } | |
701 | } | |
702 | ||
703 | #else | |
704 | ||
705 | static void vm_unregister_cmdline_devices(void) | |
706 | { | |
707 | } | |
708 | ||
709 | #endif | |
710 | ||
edfd52e6 PM |
711 | /* Platform driver */ |
712 | ||
713 | static struct of_device_id virtio_mmio_match[] = { | |
714 | { .compatible = "virtio,mmio", }, | |
715 | {}, | |
716 | }; | |
717 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); | |
718 | ||
38c4ab8e GG |
719 | #ifdef CONFIG_ACPI |
720 | static const struct acpi_device_id virtio_mmio_acpi_match[] = { | |
721 | { "LNRO0005", }, | |
722 | { } | |
723 | }; | |
724 | MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); | |
725 | #endif | |
726 | ||
edfd52e6 PM |
727 | static struct platform_driver virtio_mmio_driver = { |
728 | .probe = virtio_mmio_probe, | |
8590dbc7 | 729 | .remove = virtio_mmio_remove, |
edfd52e6 PM |
730 | .driver = { |
731 | .name = "virtio-mmio", | |
edfd52e6 | 732 | .of_match_table = virtio_mmio_match, |
38c4ab8e | 733 | .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), |
edfd52e6 PM |
734 | }, |
735 | }; | |
736 | ||
737 | static int __init virtio_mmio_init(void) | |
738 | { | |
739 | return platform_driver_register(&virtio_mmio_driver); | |
740 | } | |
741 | ||
742 | static void __exit virtio_mmio_exit(void) | |
743 | { | |
744 | platform_driver_unregister(&virtio_mmio_driver); | |
81a054ce | 745 | vm_unregister_cmdline_devices(); |
edfd52e6 PM |
746 | } |
747 | ||
748 | module_init(virtio_mmio_init); | |
749 | module_exit(virtio_mmio_exit); | |
750 | ||
751 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
752 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); | |
753 | MODULE_LICENSE("GPL"); |