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f33f5fe2 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
edfd52e6 PM |
2 | /* |
3 | * Virtio memory mapped device driver | |
4 | * | |
1862ee22 | 5 | * Copyright 2011-2014, ARM Ltd. |
edfd52e6 PM |
6 | * |
7 | * This module allows virtio devices to be used over a virtual, memory mapped | |
8 | * platform device. | |
9 | * | |
81a054ce PM |
10 | * The guest device(s) may be instantiated in one of three equivalent ways: |
11 | * | |
12 | * 1. Static platform device in board's code, eg.: | |
13 | * | |
14 | * static struct platform_device v2m_virtio_device = { | |
15 | * .name = "virtio-mmio", | |
16 | * .id = -1, | |
17 | * .num_resources = 2, | |
18 | * .resource = (struct resource []) { | |
19 | * { | |
20 | * .start = 0x1001e000, | |
21 | * .end = 0x1001e0ff, | |
22 | * .flags = IORESOURCE_MEM, | |
23 | * }, { | |
24 | * .start = 42 + 32, | |
25 | * .end = 42 + 32, | |
26 | * .flags = IORESOURCE_IRQ, | |
27 | * }, | |
28 | * } | |
29 | * }; | |
30 | * | |
31 | * 2. Device Tree node, eg.: | |
32 | * | |
33 | * virtio_block@1e000 { | |
34 | * compatible = "virtio,mmio"; | |
35 | * reg = <0x1e000 0x100>; | |
36 | * interrupts = <42>; | |
37 | * } | |
38 | * | |
39 | * 3. Kernel module (or command line) parameter. Can be used more than once - | |
40 | * one device will be created for each one. Syntax: | |
41 | * | |
42 | * [virtio_mmio.]device=<size>@<baseaddr>:<irq>[:<id>] | |
43 | * where: | |
44 | * <size> := size (can use standard suffixes like K, M or G) | |
45 | * <baseaddr> := physical base address | |
46 | * <irq> := interrupt number (as passed to request_irq()) | |
47 | * <id> := (optional) platform device id | |
48 | * eg.: | |
49 | * virtio_mmio.device=0x100@0x100b0000:48 \ | |
50 | * virtio_mmio.device=1K@0x1001e000:74 | |
51 | * | |
edfd52e6 | 52 | * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007 |
edfd52e6 PM |
53 | */ |
54 | ||
81a054ce PM |
55 | #define pr_fmt(fmt) "virtio-mmio: " fmt |
56 | ||
38c4ab8e | 57 | #include <linux/acpi.h> |
f7f6634d | 58 | #include <linux/dma-mapping.h> |
edfd52e6 PM |
59 | #include <linux/highmem.h> |
60 | #include <linux/interrupt.h> | |
61 | #include <linux/io.h> | |
62 | #include <linux/list.h> | |
63 | #include <linux/module.h> | |
64 | #include <linux/platform_device.h> | |
ed7ac37f | 65 | #include <linux/pm.h> |
edfd52e6 PM |
66 | #include <linux/slab.h> |
67 | #include <linux/spinlock.h> | |
68 | #include <linux/virtio.h> | |
69 | #include <linux/virtio_config.h> | |
51be7a9a | 70 | #include <uapi/linux/virtio_mmio.h> |
edfd52e6 PM |
71 | #include <linux/virtio_ring.h> |
72 | ||
73 | ||
74 | ||
75 | /* The alignment to use between consumer and producer parts of vring. | |
76 | * Currently hardcoded to the page size. */ | |
77 | #define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE | |
78 | ||
79 | ||
80 | ||
81 | #define to_virtio_mmio_device(_plat_dev) \ | |
82 | container_of(_plat_dev, struct virtio_mmio_device, vdev) | |
83 | ||
84 | struct virtio_mmio_device { | |
85 | struct virtio_device vdev; | |
86 | struct platform_device *pdev; | |
87 | ||
88 | void __iomem *base; | |
89 | unsigned long version; | |
90 | ||
91 | /* a list of queues so we can dispatch IRQs */ | |
92 | spinlock_t lock; | |
93 | struct list_head virtqueues; | |
94 | }; | |
95 | ||
96 | struct virtio_mmio_vq_info { | |
97 | /* the actual virtqueue */ | |
98 | struct virtqueue *vq; | |
99 | ||
edfd52e6 PM |
100 | /* the list node for the virtqueues list */ |
101 | struct list_head node; | |
102 | }; | |
103 | ||
104 | ||
105 | ||
106 | /* Configuration interface */ | |
107 | ||
d0254773 | 108 | static u64 vm_get_features(struct virtio_device *vdev) |
edfd52e6 PM |
109 | { |
110 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
1862ee22 PM |
111 | u64 features; |
112 | ||
113 | writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); | |
114 | features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
115 | features <<= 32; | |
edfd52e6 | 116 | |
1862ee22 PM |
117 | writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
118 | features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
edfd52e6 | 119 | |
1862ee22 | 120 | return features; |
edfd52e6 PM |
121 | } |
122 | ||
5c609a5e | 123 | static int vm_finalize_features(struct virtio_device *vdev) |
edfd52e6 PM |
124 | { |
125 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 PM |
126 | |
127 | /* Give virtio_ring a chance to accept features. */ | |
128 | vring_transport_features(vdev); | |
129 | ||
0c4aeb4b | 130 | /* Make sure there are no mixed devices */ |
1862ee22 PM |
131 | if (vm_dev->version == 2 && |
132 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { | |
133 | dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); | |
134 | return -EINVAL; | |
135 | } | |
136 | ||
137 | writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); | |
138 | writel((u32)(vdev->features >> 32), | |
139 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
93d389f8 | 140 | |
1862ee22 PM |
141 | writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
142 | writel((u32)vdev->features, | |
143 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
5c609a5e MT |
144 | |
145 | return 0; | |
edfd52e6 PM |
146 | } |
147 | ||
31532340 ST |
148 | static void vm_get(struct virtio_device *vdev, unsigned int offset, |
149 | void *buf, unsigned int len) | |
edfd52e6 PM |
150 | { |
151 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
152 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
153 | u8 b; | |
154 | __le16 w; | |
155 | __le32 l; | |
156 | ||
157 | if (vm_dev->version == 1) { | |
158 | u8 *ptr = buf; | |
159 | int i; | |
160 | ||
161 | for (i = 0; i < len; i++) | |
162 | ptr[i] = readb(base + offset + i); | |
163 | return; | |
164 | } | |
edfd52e6 | 165 | |
704a0b5f MT |
166 | switch (len) { |
167 | case 1: | |
168 | b = readb(base + offset); | |
169 | memcpy(buf, &b, sizeof b); | |
170 | break; | |
171 | case 2: | |
172 | w = cpu_to_le16(readw(base + offset)); | |
173 | memcpy(buf, &w, sizeof w); | |
174 | break; | |
175 | case 4: | |
176 | l = cpu_to_le32(readl(base + offset)); | |
177 | memcpy(buf, &l, sizeof l); | |
178 | break; | |
179 | case 8: | |
180 | l = cpu_to_le32(readl(base + offset)); | |
181 | memcpy(buf, &l, sizeof l); | |
182 | l = cpu_to_le32(ioread32(base + offset + sizeof l)); | |
183 | memcpy(buf + sizeof l, &l, sizeof l); | |
184 | break; | |
185 | default: | |
186 | BUG(); | |
187 | } | |
edfd52e6 PM |
188 | } |
189 | ||
31532340 ST |
190 | static void vm_set(struct virtio_device *vdev, unsigned int offset, |
191 | const void *buf, unsigned int len) | |
edfd52e6 PM |
192 | { |
193 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
194 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
195 | u8 b; | |
196 | __le16 w; | |
197 | __le32 l; | |
198 | ||
199 | if (vm_dev->version == 1) { | |
200 | const u8 *ptr = buf; | |
201 | int i; | |
202 | ||
203 | for (i = 0; i < len; i++) | |
204 | writeb(ptr[i], base + offset + i); | |
edfd52e6 | 205 | |
704a0b5f MT |
206 | return; |
207 | } | |
208 | ||
209 | switch (len) { | |
210 | case 1: | |
211 | memcpy(&b, buf, sizeof b); | |
212 | writeb(b, base + offset); | |
213 | break; | |
214 | case 2: | |
215 | memcpy(&w, buf, sizeof w); | |
216 | writew(le16_to_cpu(w), base + offset); | |
217 | break; | |
218 | case 4: | |
219 | memcpy(&l, buf, sizeof l); | |
220 | writel(le32_to_cpu(l), base + offset); | |
221 | break; | |
222 | case 8: | |
223 | memcpy(&l, buf, sizeof l); | |
224 | writel(le32_to_cpu(l), base + offset); | |
225 | memcpy(&l, buf + sizeof l, sizeof l); | |
226 | writel(le32_to_cpu(l), base + offset + sizeof l); | |
227 | break; | |
228 | default: | |
229 | BUG(); | |
230 | } | |
edfd52e6 PM |
231 | } |
232 | ||
87e7bf14 MT |
233 | static u32 vm_generation(struct virtio_device *vdev) |
234 | { | |
235 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
236 | ||
237 | if (vm_dev->version == 1) | |
238 | return 0; | |
239 | else | |
240 | return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); | |
241 | } | |
242 | ||
edfd52e6 PM |
243 | static u8 vm_get_status(struct virtio_device *vdev) |
244 | { | |
245 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
246 | ||
247 | return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; | |
248 | } | |
249 | ||
250 | static void vm_set_status(struct virtio_device *vdev, u8 status) | |
251 | { | |
252 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
253 | ||
254 | /* We should never be setting status to 0. */ | |
255 | BUG_ON(status == 0); | |
256 | ||
8b4ec69d JW |
257 | /* |
258 | * Per memory-barriers.txt, wmb() is not needed to guarantee | |
acb0055e | 259 | * that the cache coherent memory writes have completed |
8b4ec69d JW |
260 | * before writing to the MMIO region. |
261 | */ | |
edfd52e6 PM |
262 | writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); |
263 | } | |
264 | ||
265 | static void vm_reset(struct virtio_device *vdev) | |
266 | { | |
267 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
268 | ||
269 | /* 0 status means a reset. */ | |
270 | writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); | |
271 | } | |
272 | ||
273 | ||
274 | ||
275 | /* Transport interface */ | |
276 | ||
277 | /* the notify function used when creating a virt queue */ | |
46f9c2b9 | 278 | static bool vm_notify(struct virtqueue *vq) |
edfd52e6 PM |
279 | { |
280 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
edfd52e6 PM |
281 | |
282 | /* We write the queue's selector into the notification register to | |
283 | * signal the other end */ | |
06ca287d | 284 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
46f9c2b9 | 285 | return true; |
edfd52e6 PM |
286 | } |
287 | ||
288 | /* Notify all virtqueues on an interrupt. */ | |
289 | static irqreturn_t vm_interrupt(int irq, void *opaque) | |
290 | { | |
291 | struct virtio_mmio_device *vm_dev = opaque; | |
292 | struct virtio_mmio_vq_info *info; | |
edfd52e6 PM |
293 | unsigned long status; |
294 | unsigned long flags; | |
295 | irqreturn_t ret = IRQ_NONE; | |
296 | ||
297 | /* Read and acknowledge interrupts */ | |
298 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); | |
299 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); | |
300 | ||
016c98c6 MT |
301 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { |
302 | virtio_config_changed(&vm_dev->vdev); | |
edfd52e6 PM |
303 | ret = IRQ_HANDLED; |
304 | } | |
305 | ||
306 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { | |
307 | spin_lock_irqsave(&vm_dev->lock, flags); | |
308 | list_for_each_entry(info, &vm_dev->virtqueues, node) | |
309 | ret |= vring_interrupt(irq, info->vq); | |
310 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
311 | } | |
312 | ||
313 | return ret; | |
314 | } | |
315 | ||
316 | ||
317 | ||
318 | static void vm_del_vq(struct virtqueue *vq) | |
319 | { | |
320 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
321 | struct virtio_mmio_vq_info *info = vq->priv; | |
b4211138 | 322 | unsigned long flags; |
06ca287d | 323 | unsigned int index = vq->index; |
edfd52e6 PM |
324 | |
325 | spin_lock_irqsave(&vm_dev->lock, flags); | |
326 | list_del(&info->node); | |
327 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
328 | ||
edfd52e6 | 329 | /* Select and deactivate the queue */ |
17bb6d40 | 330 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
1862ee22 PM |
331 | if (vm_dev->version == 1) { |
332 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
333 | } else { | |
334 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
335 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
336 | } | |
edfd52e6 | 337 | |
b4211138 AL |
338 | vring_del_virtqueue(vq); |
339 | ||
edfd52e6 PM |
340 | kfree(info); |
341 | } | |
342 | ||
343 | static void vm_del_vqs(struct virtio_device *vdev) | |
344 | { | |
345 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
346 | struct virtqueue *vq, *n; | |
347 | ||
348 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
349 | vm_del_vq(vq); | |
350 | ||
351 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); | |
352 | } | |
353 | ||
9e9b2893 JW |
354 | static void vm_synchronize_cbs(struct virtio_device *vdev) |
355 | { | |
356 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
357 | ||
358 | synchronize_irq(platform_get_irq(vm_dev->pdev, 0)); | |
359 | } | |
360 | ||
31532340 | 361 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int index, |
edfd52e6 | 362 | void (*callback)(struct virtqueue *vq), |
f94682dd | 363 | const char *name, bool ctx) |
edfd52e6 PM |
364 | { |
365 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
366 | struct virtio_mmio_vq_info *info; | |
367 | struct virtqueue *vq; | |
b4211138 AL |
368 | unsigned long flags; |
369 | unsigned int num; | |
edfd52e6 PM |
370 | int err; |
371 | ||
6457f126 MT |
372 | if (!name) |
373 | return NULL; | |
374 | ||
edfd52e6 PM |
375 | /* Select the queue we're interested in */ |
376 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); | |
377 | ||
378 | /* Queue shouldn't already be set up. */ | |
1862ee22 PM |
379 | if (readl(vm_dev->base + (vm_dev->version == 1 ? |
380 | VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { | |
edfd52e6 PM |
381 | err = -ENOENT; |
382 | goto error_available; | |
383 | } | |
384 | ||
385 | /* Allocate and fill out our active queue description */ | |
386 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
387 | if (!info) { | |
388 | err = -ENOMEM; | |
389 | goto error_kmalloc; | |
390 | } | |
edfd52e6 | 391 | |
b4211138 AL |
392 | num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); |
393 | if (num == 0) { | |
d78b519f | 394 | err = -ENOENT; |
b4211138 | 395 | goto error_new_virtqueue; |
edfd52e6 PM |
396 | } |
397 | ||
edfd52e6 | 398 | /* Create the vring */ |
b4211138 | 399 | vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
f94682dd | 400 | true, true, ctx, vm_notify, callback, name); |
edfd52e6 PM |
401 | if (!vq) { |
402 | err = -ENOMEM; | |
403 | goto error_new_virtqueue; | |
404 | } | |
405 | ||
1862ee22 | 406 | /* Activate the queue */ |
b4211138 | 407 | writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); |
1862ee22 | 408 | if (vm_dev->version == 1) { |
3fc92a96 SP |
409 | u64 q_pfn = virtqueue_get_desc_addr(vq) >> PAGE_SHIFT; |
410 | ||
411 | /* | |
412 | * virtio-mmio v1 uses a 32bit QUEUE PFN. If we have something | |
413 | * that doesn't fit in 32bit, fail the setup rather than | |
414 | * pretending to be successful. | |
415 | */ | |
416 | if (q_pfn >> 32) { | |
417 | dev_err(&vdev->dev, | |
418 | "platform bug: legacy virtio-mmio must not be used with RAM above 0x%llxGB\n", | |
419 | 0x1ULL << (32 + PAGE_SHIFT - 30)); | |
420 | err = -E2BIG; | |
421 | goto error_bad_pfn; | |
422 | } | |
423 | ||
1862ee22 | 424 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); |
3fc92a96 | 425 | writel(q_pfn, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
1862ee22 PM |
426 | } else { |
427 | u64 addr; | |
428 | ||
b4211138 | 429 | addr = virtqueue_get_desc_addr(vq); |
1862ee22 PM |
430 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); |
431 | writel((u32)(addr >> 32), | |
432 | vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); | |
433 | ||
b4211138 | 434 | addr = virtqueue_get_avail_addr(vq); |
1862ee22 PM |
435 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); |
436 | writel((u32)(addr >> 32), | |
437 | vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); | |
438 | ||
b4211138 | 439 | addr = virtqueue_get_used_addr(vq); |
1862ee22 PM |
440 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); |
441 | writel((u32)(addr >> 32), | |
442 | vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); | |
443 | ||
444 | writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
445 | } | |
446 | ||
edfd52e6 PM |
447 | vq->priv = info; |
448 | info->vq = vq; | |
449 | ||
450 | spin_lock_irqsave(&vm_dev->lock, flags); | |
451 | list_add(&info->node, &vm_dev->virtqueues); | |
452 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
453 | ||
454 | return vq; | |
455 | ||
3fc92a96 SP |
456 | error_bad_pfn: |
457 | vring_del_virtqueue(vq); | |
edfd52e6 | 458 | error_new_virtqueue: |
1862ee22 PM |
459 | if (vm_dev->version == 1) { |
460 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
461 | } else { | |
462 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
463 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
464 | } | |
edfd52e6 PM |
465 | kfree(info); |
466 | error_kmalloc: | |
467 | error_available: | |
468 | return ERR_PTR(err); | |
469 | } | |
470 | ||
31532340 | 471 | static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs, |
edfd52e6 PM |
472 | struct virtqueue *vqs[], |
473 | vq_callback_t *callbacks[], | |
fb5e31d9 | 474 | const char * const names[], |
f94682dd | 475 | const bool *ctx, |
fb5e31d9 | 476 | struct irq_affinity *desc) |
edfd52e6 PM |
477 | { |
478 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
5e663f04 | 479 | int irq = platform_get_irq(vm_dev->pdev, 0); |
a229989d | 480 | int i, err, queue_idx = 0; |
edfd52e6 | 481 | |
0c35c674 | 482 | if (irq < 0) |
5e663f04 | 483 | return irq; |
5e663f04 | 484 | |
edfd52e6 PM |
485 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, |
486 | dev_name(&vdev->dev), vm_dev); | |
487 | if (err) | |
488 | return err; | |
489 | ||
490 | for (i = 0; i < nvqs; ++i) { | |
a229989d WW |
491 | if (!names[i]) { |
492 | vqs[i] = NULL; | |
493 | continue; | |
494 | } | |
495 | ||
496 | vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i], | |
f94682dd | 497 | ctx ? ctx[i] : false); |
edfd52e6 PM |
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 | |
38e89548 SB |
514 | static bool vm_get_shm_region(struct virtio_device *vdev, |
515 | struct virtio_shm_region *region, u8 id) | |
516 | { | |
517 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
518 | u64 len, addr; | |
519 | ||
520 | /* Select the region we're interested in */ | |
521 | writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL); | |
522 | ||
523 | /* Read the region size */ | |
524 | len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW); | |
525 | len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32; | |
526 | ||
527 | region->len = len; | |
528 | ||
529 | /* Check if region length is -1. If that's the case, the shared memory | |
530 | * region does not exist and there is no need to proceed further. | |
531 | */ | |
532 | if (len == ~(u64)0) | |
533 | return false; | |
534 | ||
535 | /* Read the region base address */ | |
536 | addr = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_LOW); | |
537 | addr |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_HIGH) << 32; | |
538 | ||
539 | region->addr = addr; | |
540 | ||
541 | return true; | |
542 | } | |
543 | ||
93503932 | 544 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
edfd52e6 PM |
545 | .get = vm_get, |
546 | .set = vm_set, | |
87e7bf14 | 547 | .generation = vm_generation, |
edfd52e6 PM |
548 | .get_status = vm_get_status, |
549 | .set_status = vm_set_status, | |
550 | .reset = vm_reset, | |
551 | .find_vqs = vm_find_vqs, | |
552 | .del_vqs = vm_del_vqs, | |
553 | .get_features = vm_get_features, | |
554 | .finalize_features = vm_finalize_features, | |
66846048 | 555 | .bus_name = vm_bus_name, |
38e89548 | 556 | .get_shm_region = vm_get_shm_region, |
9e9b2893 | 557 | .synchronize_cbs = vm_synchronize_cbs, |
edfd52e6 PM |
558 | }; |
559 | ||
ed7ac37f SG |
560 | #ifdef CONFIG_PM_SLEEP |
561 | static int virtio_mmio_freeze(struct device *dev) | |
562 | { | |
563 | struct virtio_mmio_device *vm_dev = dev_get_drvdata(dev); | |
564 | ||
565 | return virtio_device_freeze(&vm_dev->vdev); | |
566 | } | |
567 | ||
568 | static int virtio_mmio_restore(struct device *dev) | |
569 | { | |
570 | struct virtio_mmio_device *vm_dev = dev_get_drvdata(dev); | |
571 | ||
e0c2ce82 SG |
572 | if (vm_dev->version == 1) |
573 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); | |
574 | ||
ed7ac37f SG |
575 | return virtio_device_restore(&vm_dev->vdev); |
576 | } | |
577 | ||
578 | static const struct dev_pm_ops virtio_mmio_pm_ops = { | |
579 | SET_SYSTEM_SLEEP_PM_OPS(virtio_mmio_freeze, virtio_mmio_restore) | |
580 | }; | |
581 | #endif | |
edfd52e6 | 582 | |
7eb781b1 | 583 | static void virtio_mmio_release_dev(struct device *_d) |
584 | { | |
585 | struct virtio_device *vdev = | |
586 | container_of(_d, struct virtio_device, dev); | |
da98b54d | 587 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
7eb781b1 | 588 | struct platform_device *pdev = vm_dev->pdev; |
589 | ||
590 | devm_kfree(&pdev->dev, vm_dev); | |
591 | } | |
edfd52e6 PM |
592 | |
593 | /* Platform device */ | |
594 | ||
8590dbc7 | 595 | static int virtio_mmio_probe(struct platform_device *pdev) |
edfd52e6 PM |
596 | { |
597 | struct virtio_mmio_device *vm_dev; | |
edfd52e6 | 598 | unsigned long magic; |
f7f6634d | 599 | int rc; |
edfd52e6 | 600 | |
edfd52e6 | 601 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); |
c2e90800 MR |
602 | if (!vm_dev) |
603 | return -ENOMEM; | |
edfd52e6 PM |
604 | |
605 | vm_dev->vdev.dev.parent = &pdev->dev; | |
7eb781b1 | 606 | vm_dev->vdev.dev.release = virtio_mmio_release_dev; |
edfd52e6 PM |
607 | vm_dev->vdev.config = &virtio_mmio_config_ops; |
608 | vm_dev->pdev = pdev; | |
609 | INIT_LIST_HEAD(&vm_dev->virtqueues); | |
610 | spin_lock_init(&vm_dev->lock); | |
611 | ||
c64eb62c YL |
612 | vm_dev->base = devm_platform_ioremap_resource(pdev, 0); |
613 | if (IS_ERR(vm_dev->base)) | |
614 | return PTR_ERR(vm_dev->base); | |
edfd52e6 PM |
615 | |
616 | /* Check magic value */ | |
617 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); | |
4ae85370 | 618 | if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
edfd52e6 | 619 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
c2e90800 | 620 | return -ENODEV; |
edfd52e6 PM |
621 | } |
622 | ||
623 | /* Check device version */ | |
624 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); | |
1862ee22 | 625 | if (vm_dev->version < 1 || vm_dev->version > 2) { |
edfd52e6 PM |
626 | dev_err(&pdev->dev, "Version %ld not supported!\n", |
627 | vm_dev->version); | |
c2e90800 | 628 | return -ENXIO; |
edfd52e6 PM |
629 | } |
630 | ||
631 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); | |
1862ee22 PM |
632 | if (vm_dev->vdev.id.device == 0) { |
633 | /* | |
634 | * virtio-mmio device with an ID 0 is a (dummy) placeholder | |
635 | * with no function. End probing now with no error reported. | |
636 | */ | |
c2e90800 | 637 | return -ENODEV; |
1862ee22 | 638 | } |
edfd52e6 PM |
639 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
640 | ||
f7f6634d | 641 | if (vm_dev->version == 1) { |
1862ee22 | 642 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); |
edfd52e6 | 643 | |
f7f6634d RM |
644 | rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); |
645 | /* | |
646 | * In the legacy case, ensure our coherently-allocated virtio | |
647 | * ring will be at an address expressable as a 32-bit PFN. | |
648 | */ | |
649 | if (!rc) | |
650 | dma_set_coherent_mask(&pdev->dev, | |
651 | DMA_BIT_MASK(32 + PAGE_SHIFT)); | |
652 | } else { | |
653 | rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); | |
654 | } | |
655 | if (rc) | |
656 | rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); | |
657 | if (rc) | |
658 | dev_warn(&pdev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); | |
659 | ||
edfd52e6 PM |
660 | platform_set_drvdata(pdev, vm_dev); |
661 | ||
7eb781b1 | 662 | rc = register_virtio_device(&vm_dev->vdev); |
c2e90800 | 663 | if (rc) |
7eb781b1 | 664 | put_device(&vm_dev->vdev.dev); |
c2e90800 | 665 | |
7eb781b1 | 666 | return rc; |
edfd52e6 PM |
667 | } |
668 | ||
8590dbc7 | 669 | static int virtio_mmio_remove(struct platform_device *pdev) |
edfd52e6 PM |
670 | { |
671 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); | |
edfd52e6 PM |
672 | unregister_virtio_device(&vm_dev->vdev); |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | ||
678 | ||
81a054ce PM |
679 | /* Devices list parameter */ |
680 | ||
681 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) | |
682 | ||
683 | static struct device vm_cmdline_parent = { | |
684 | .init_name = "virtio-mmio-cmdline", | |
685 | }; | |
686 | ||
687 | static int vm_cmdline_parent_registered; | |
688 | static int vm_cmdline_id; | |
689 | ||
690 | static int vm_cmdline_set(const char *device, | |
691 | const struct kernel_param *kp) | |
692 | { | |
693 | int err; | |
694 | struct resource resources[2] = {}; | |
695 | char *str; | |
0619eda8 | 696 | long long base, size; |
40f9938c | 697 | unsigned int irq; |
81a054ce PM |
698 | int processed, consumed = 0; |
699 | struct platform_device *pdev; | |
700 | ||
40f9938c PM |
701 | /* Consume "size" part of the command line parameter */ |
702 | size = memparse(device, &str); | |
81a054ce | 703 | |
40f9938c | 704 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
81a054ce | 705 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
40f9938c | 706 | &base, &irq, &consumed, |
81a054ce PM |
707 | &vm_cmdline_id, &consumed); |
708 | ||
40f9938c | 709 | /* |
62ca18a0 | 710 | * sscanf() must process at least 2 chunks; also there |
40f9938c PM |
711 | * must be no extra characters after the last chunk, so |
712 | * str[consumed] must be '\0' | |
713 | */ | |
62ca18a0 | 714 | if (processed < 2 || str[consumed] || irq == 0) |
81a054ce PM |
715 | return -EINVAL; |
716 | ||
40f9938c | 717 | resources[0].flags = IORESOURCE_MEM; |
81a054ce | 718 | resources[0].start = base; |
40f9938c PM |
719 | resources[0].end = base + size - 1; |
720 | ||
721 | resources[1].flags = IORESOURCE_IRQ; | |
722 | resources[1].start = resources[1].end = irq; | |
81a054ce PM |
723 | |
724 | if (!vm_cmdline_parent_registered) { | |
725 | err = device_register(&vm_cmdline_parent); | |
726 | if (err) { | |
a58a7f97 | 727 | put_device(&vm_cmdline_parent); |
81a054ce PM |
728 | pr_err("Failed to register parent device!\n"); |
729 | return err; | |
730 | } | |
731 | vm_cmdline_parent_registered = 1; | |
732 | } | |
733 | ||
734 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", | |
735 | vm_cmdline_id, | |
736 | (unsigned long long)resources[0].start, | |
737 | (unsigned long long)resources[0].end, | |
738 | (int)resources[1].start); | |
739 | ||
740 | pdev = platform_device_register_resndata(&vm_cmdline_parent, | |
741 | "virtio-mmio", vm_cmdline_id++, | |
742 | resources, ARRAY_SIZE(resources), NULL, 0); | |
81a054ce | 743 | |
c2c9f9bc | 744 | return PTR_ERR_OR_ZERO(pdev); |
81a054ce PM |
745 | } |
746 | ||
747 | static int vm_cmdline_get_device(struct device *dev, void *data) | |
748 | { | |
749 | char *buffer = data; | |
750 | unsigned int len = strlen(buffer); | |
751 | struct platform_device *pdev = to_platform_device(dev); | |
752 | ||
753 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", | |
754 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, | |
755 | (unsigned long long)pdev->resource[0].start, | |
756 | (unsigned long long)pdev->resource[1].start, | |
757 | pdev->id); | |
758 | return 0; | |
759 | } | |
760 | ||
761 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) | |
762 | { | |
763 | buffer[0] = '\0'; | |
764 | device_for_each_child(&vm_cmdline_parent, buffer, | |
765 | vm_cmdline_get_device); | |
766 | return strlen(buffer) + 1; | |
767 | } | |
768 | ||
9c27847d | 769 | static const struct kernel_param_ops vm_cmdline_param_ops = { |
81a054ce PM |
770 | .set = vm_cmdline_set, |
771 | .get = vm_cmdline_get, | |
772 | }; | |
773 | ||
774 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); | |
775 | ||
776 | static int vm_unregister_cmdline_device(struct device *dev, | |
777 | void *data) | |
778 | { | |
779 | platform_device_unregister(to_platform_device(dev)); | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | static void vm_unregister_cmdline_devices(void) | |
785 | { | |
786 | if (vm_cmdline_parent_registered) { | |
787 | device_for_each_child(&vm_cmdline_parent, NULL, | |
788 | vm_unregister_cmdline_device); | |
789 | device_unregister(&vm_cmdline_parent); | |
790 | vm_cmdline_parent_registered = 0; | |
791 | } | |
792 | } | |
793 | ||
794 | #else | |
795 | ||
796 | static void vm_unregister_cmdline_devices(void) | |
797 | { | |
798 | } | |
799 | ||
800 | #endif | |
801 | ||
edfd52e6 PM |
802 | /* Platform driver */ |
803 | ||
31919140 | 804 | static const struct of_device_id virtio_mmio_match[] = { |
edfd52e6 PM |
805 | { .compatible = "virtio,mmio", }, |
806 | {}, | |
807 | }; | |
808 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); | |
809 | ||
38c4ab8e GG |
810 | #ifdef CONFIG_ACPI |
811 | static const struct acpi_device_id virtio_mmio_acpi_match[] = { | |
812 | { "LNRO0005", }, | |
813 | { } | |
814 | }; | |
815 | MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); | |
816 | #endif | |
817 | ||
edfd52e6 PM |
818 | static struct platform_driver virtio_mmio_driver = { |
819 | .probe = virtio_mmio_probe, | |
8590dbc7 | 820 | .remove = virtio_mmio_remove, |
edfd52e6 PM |
821 | .driver = { |
822 | .name = "virtio-mmio", | |
edfd52e6 | 823 | .of_match_table = virtio_mmio_match, |
38c4ab8e | 824 | .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), |
ed7ac37f SG |
825 | #ifdef CONFIG_PM_SLEEP |
826 | .pm = &virtio_mmio_pm_ops, | |
827 | #endif | |
edfd52e6 PM |
828 | }, |
829 | }; | |
830 | ||
831 | static int __init virtio_mmio_init(void) | |
832 | { | |
833 | return platform_driver_register(&virtio_mmio_driver); | |
834 | } | |
835 | ||
836 | static void __exit virtio_mmio_exit(void) | |
837 | { | |
838 | platform_driver_unregister(&virtio_mmio_driver); | |
81a054ce | 839 | vm_unregister_cmdline_devices(); |
edfd52e6 PM |
840 | } |
841 | ||
842 | module_init(virtio_mmio_init); | |
843 | module_exit(virtio_mmio_exit); | |
844 | ||
845 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
846 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); | |
847 | MODULE_LICENSE("GPL"); |