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Commit | Line | Data |
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16603153 AN |
1 | /* |
2 | * Thunderbolt Cactus Ridge driver - NHI driver | |
3 | * | |
4 | * The NHI (native host interface) is the pci device that allows us to send and | |
5 | * receive frames from the thunderbolt bus. | |
6 | * | |
7 | * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> | |
8 | */ | |
9 | ||
23dd5bb4 | 10 | #include <linux/pm_runtime.h> |
16603153 AN |
11 | #include <linux/slab.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/pci.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/dmi.h> | |
17 | ||
18 | #include "nhi.h" | |
19 | #include "nhi_regs.h" | |
d6cc51cd | 20 | #include "tb.h" |
16603153 AN |
21 | |
22 | #define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring") | |
23 | ||
24 | ||
25 | static int ring_interrupt_index(struct tb_ring *ring) | |
26 | { | |
27 | int bit = ring->hop; | |
28 | if (!ring->is_tx) | |
29 | bit += ring->nhi->hop_count; | |
30 | return bit; | |
31 | } | |
32 | ||
33 | /** | |
34 | * ring_interrupt_active() - activate/deactivate interrupts for a single ring | |
35 | * | |
36 | * ring->nhi->lock must be held. | |
37 | */ | |
38 | static void ring_interrupt_active(struct tb_ring *ring, bool active) | |
39 | { | |
40 | int reg = REG_RING_INTERRUPT_BASE + ring_interrupt_index(ring) / 32; | |
41 | int bit = ring_interrupt_index(ring) & 31; | |
42 | int mask = 1 << bit; | |
43 | u32 old, new; | |
44 | old = ioread32(ring->nhi->iobase + reg); | |
45 | if (active) | |
46 | new = old | mask; | |
47 | else | |
48 | new = old & ~mask; | |
49 | ||
50 | dev_info(&ring->nhi->pdev->dev, | |
51 | "%s interrupt at register %#x bit %d (%#x -> %#x)\n", | |
52 | active ? "enabling" : "disabling", reg, bit, old, new); | |
53 | ||
54 | if (new == old) | |
55 | dev_WARN(&ring->nhi->pdev->dev, | |
56 | "interrupt for %s %d is already %s\n", | |
57 | RING_TYPE(ring), ring->hop, | |
58 | active ? "enabled" : "disabled"); | |
59 | iowrite32(new, ring->nhi->iobase + reg); | |
60 | } | |
61 | ||
62 | /** | |
63 | * nhi_disable_interrupts() - disable interrupts for all rings | |
64 | * | |
65 | * Use only during init and shutdown. | |
66 | */ | |
67 | static void nhi_disable_interrupts(struct tb_nhi *nhi) | |
68 | { | |
69 | int i = 0; | |
70 | /* disable interrupts */ | |
71 | for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++) | |
72 | iowrite32(0, nhi->iobase + REG_RING_INTERRUPT_BASE + 4 * i); | |
73 | ||
74 | /* clear interrupt status bits */ | |
75 | for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++) | |
76 | ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + 4 * i); | |
77 | } | |
78 | ||
79 | /* ring helper methods */ | |
80 | ||
81 | static void __iomem *ring_desc_base(struct tb_ring *ring) | |
82 | { | |
83 | void __iomem *io = ring->nhi->iobase; | |
84 | io += ring->is_tx ? REG_TX_RING_BASE : REG_RX_RING_BASE; | |
85 | io += ring->hop * 16; | |
86 | return io; | |
87 | } | |
88 | ||
89 | static void __iomem *ring_options_base(struct tb_ring *ring) | |
90 | { | |
91 | void __iomem *io = ring->nhi->iobase; | |
92 | io += ring->is_tx ? REG_TX_OPTIONS_BASE : REG_RX_OPTIONS_BASE; | |
93 | io += ring->hop * 32; | |
94 | return io; | |
95 | } | |
96 | ||
97 | static void ring_iowrite16desc(struct tb_ring *ring, u32 value, u32 offset) | |
98 | { | |
99 | iowrite16(value, ring_desc_base(ring) + offset); | |
100 | } | |
101 | ||
102 | static void ring_iowrite32desc(struct tb_ring *ring, u32 value, u32 offset) | |
103 | { | |
104 | iowrite32(value, ring_desc_base(ring) + offset); | |
105 | } | |
106 | ||
107 | static void ring_iowrite64desc(struct tb_ring *ring, u64 value, u32 offset) | |
108 | { | |
109 | iowrite32(value, ring_desc_base(ring) + offset); | |
110 | iowrite32(value >> 32, ring_desc_base(ring) + offset + 4); | |
111 | } | |
112 | ||
113 | static void ring_iowrite32options(struct tb_ring *ring, u32 value, u32 offset) | |
114 | { | |
115 | iowrite32(value, ring_options_base(ring) + offset); | |
116 | } | |
117 | ||
118 | static bool ring_full(struct tb_ring *ring) | |
119 | { | |
120 | return ((ring->head + 1) % ring->size) == ring->tail; | |
121 | } | |
122 | ||
123 | static bool ring_empty(struct tb_ring *ring) | |
124 | { | |
125 | return ring->head == ring->tail; | |
126 | } | |
127 | ||
128 | /** | |
129 | * ring_write_descriptors() - post frames from ring->queue to the controller | |
130 | * | |
131 | * ring->lock is held. | |
132 | */ | |
133 | static void ring_write_descriptors(struct tb_ring *ring) | |
134 | { | |
135 | struct ring_frame *frame, *n; | |
136 | struct ring_desc *descriptor; | |
137 | list_for_each_entry_safe(frame, n, &ring->queue, list) { | |
138 | if (ring_full(ring)) | |
139 | break; | |
140 | list_move_tail(&frame->list, &ring->in_flight); | |
141 | descriptor = &ring->descriptors[ring->head]; | |
142 | descriptor->phys = frame->buffer_phy; | |
143 | descriptor->time = 0; | |
144 | descriptor->flags = RING_DESC_POSTED | RING_DESC_INTERRUPT; | |
145 | if (ring->is_tx) { | |
146 | descriptor->length = frame->size; | |
147 | descriptor->eof = frame->eof; | |
148 | descriptor->sof = frame->sof; | |
149 | } | |
150 | ring->head = (ring->head + 1) % ring->size; | |
151 | ring_iowrite16desc(ring, ring->head, ring->is_tx ? 10 : 8); | |
152 | } | |
153 | } | |
154 | ||
155 | /** | |
156 | * ring_work() - progress completed frames | |
157 | * | |
158 | * If the ring is shutting down then all frames are marked as canceled and | |
159 | * their callbacks are invoked. | |
160 | * | |
161 | * Otherwise we collect all completed frame from the ring buffer, write new | |
162 | * frame to the ring buffer and invoke the callbacks for the completed frames. | |
163 | */ | |
164 | static void ring_work(struct work_struct *work) | |
165 | { | |
166 | struct tb_ring *ring = container_of(work, typeof(*ring), work); | |
167 | struct ring_frame *frame; | |
168 | bool canceled = false; | |
169 | LIST_HEAD(done); | |
170 | mutex_lock(&ring->lock); | |
171 | ||
172 | if (!ring->running) { | |
173 | /* Move all frames to done and mark them as canceled. */ | |
174 | list_splice_tail_init(&ring->in_flight, &done); | |
175 | list_splice_tail_init(&ring->queue, &done); | |
176 | canceled = true; | |
177 | goto invoke_callback; | |
178 | } | |
179 | ||
180 | while (!ring_empty(ring)) { | |
181 | if (!(ring->descriptors[ring->tail].flags | |
182 | & RING_DESC_COMPLETED)) | |
183 | break; | |
184 | frame = list_first_entry(&ring->in_flight, typeof(*frame), | |
185 | list); | |
186 | list_move_tail(&frame->list, &done); | |
187 | if (!ring->is_tx) { | |
188 | frame->size = ring->descriptors[ring->tail].length; | |
189 | frame->eof = ring->descriptors[ring->tail].eof; | |
190 | frame->sof = ring->descriptors[ring->tail].sof; | |
191 | frame->flags = ring->descriptors[ring->tail].flags; | |
192 | if (frame->sof != 0) | |
193 | dev_WARN(&ring->nhi->pdev->dev, | |
194 | "%s %d got unexpected SOF: %#x\n", | |
195 | RING_TYPE(ring), ring->hop, | |
196 | frame->sof); | |
197 | /* | |
198 | * known flags: | |
199 | * raw not enabled, interupt not set: 0x2=0010 | |
200 | * raw enabled: 0xa=1010 | |
201 | * raw not enabled: 0xb=1011 | |
202 | * partial frame (>MAX_FRAME_SIZE): 0xe=1110 | |
203 | */ | |
204 | if (frame->flags != 0xa) | |
205 | dev_WARN(&ring->nhi->pdev->dev, | |
206 | "%s %d got unexpected flags: %#x\n", | |
207 | RING_TYPE(ring), ring->hop, | |
208 | frame->flags); | |
209 | } | |
210 | ring->tail = (ring->tail + 1) % ring->size; | |
211 | } | |
212 | ring_write_descriptors(ring); | |
213 | ||
214 | invoke_callback: | |
215 | mutex_unlock(&ring->lock); /* allow callbacks to schedule new work */ | |
216 | while (!list_empty(&done)) { | |
217 | frame = list_first_entry(&done, typeof(*frame), list); | |
218 | /* | |
219 | * The callback may reenqueue or delete frame. | |
220 | * Do not hold on to it. | |
221 | */ | |
222 | list_del_init(&frame->list); | |
223 | frame->callback(ring, frame, canceled); | |
224 | } | |
225 | } | |
226 | ||
227 | int __ring_enqueue(struct tb_ring *ring, struct ring_frame *frame) | |
228 | { | |
229 | int ret = 0; | |
230 | mutex_lock(&ring->lock); | |
231 | if (ring->running) { | |
232 | list_add_tail(&frame->list, &ring->queue); | |
233 | ring_write_descriptors(ring); | |
234 | } else { | |
235 | ret = -ESHUTDOWN; | |
236 | } | |
237 | mutex_unlock(&ring->lock); | |
238 | return ret; | |
239 | } | |
240 | ||
241 | static struct tb_ring *ring_alloc(struct tb_nhi *nhi, u32 hop, int size, | |
242 | bool transmit) | |
243 | { | |
244 | struct tb_ring *ring = NULL; | |
245 | dev_info(&nhi->pdev->dev, "allocating %s ring %d of size %d\n", | |
246 | transmit ? "TX" : "RX", hop, size); | |
247 | ||
248 | mutex_lock(&nhi->lock); | |
249 | if (hop >= nhi->hop_count) { | |
250 | dev_WARN(&nhi->pdev->dev, "invalid hop: %d\n", hop); | |
251 | goto err; | |
252 | } | |
253 | if (transmit && nhi->tx_rings[hop]) { | |
254 | dev_WARN(&nhi->pdev->dev, "TX hop %d already allocated\n", hop); | |
255 | goto err; | |
256 | } else if (!transmit && nhi->rx_rings[hop]) { | |
257 | dev_WARN(&nhi->pdev->dev, "RX hop %d already allocated\n", hop); | |
258 | goto err; | |
259 | } | |
260 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
261 | if (!ring) | |
262 | goto err; | |
263 | ||
264 | mutex_init(&ring->lock); | |
265 | INIT_LIST_HEAD(&ring->queue); | |
266 | INIT_LIST_HEAD(&ring->in_flight); | |
267 | INIT_WORK(&ring->work, ring_work); | |
268 | ||
269 | ring->nhi = nhi; | |
270 | ring->hop = hop; | |
271 | ring->is_tx = transmit; | |
272 | ring->size = size; | |
273 | ring->head = 0; | |
274 | ring->tail = 0; | |
275 | ring->running = false; | |
276 | ring->descriptors = dma_alloc_coherent(&ring->nhi->pdev->dev, | |
277 | size * sizeof(*ring->descriptors), | |
278 | &ring->descriptors_dma, GFP_KERNEL | __GFP_ZERO); | |
279 | if (!ring->descriptors) | |
280 | goto err; | |
281 | ||
282 | if (transmit) | |
283 | nhi->tx_rings[hop] = ring; | |
284 | else | |
285 | nhi->rx_rings[hop] = ring; | |
286 | mutex_unlock(&nhi->lock); | |
287 | return ring; | |
288 | ||
289 | err: | |
290 | if (ring) | |
291 | mutex_destroy(&ring->lock); | |
292 | kfree(ring); | |
293 | mutex_unlock(&nhi->lock); | |
294 | return NULL; | |
295 | } | |
296 | ||
297 | struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size) | |
298 | { | |
299 | return ring_alloc(nhi, hop, size, true); | |
300 | } | |
301 | ||
302 | struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size) | |
303 | { | |
304 | return ring_alloc(nhi, hop, size, false); | |
305 | } | |
306 | ||
307 | /** | |
308 | * ring_start() - enable a ring | |
309 | * | |
310 | * Must not be invoked in parallel with ring_stop(). | |
311 | */ | |
312 | void ring_start(struct tb_ring *ring) | |
313 | { | |
314 | mutex_lock(&ring->nhi->lock); | |
315 | mutex_lock(&ring->lock); | |
316 | if (ring->running) { | |
317 | dev_WARN(&ring->nhi->pdev->dev, "ring already started\n"); | |
318 | goto err; | |
319 | } | |
320 | dev_info(&ring->nhi->pdev->dev, "starting %s %d\n", | |
321 | RING_TYPE(ring), ring->hop); | |
322 | ||
323 | ring_iowrite64desc(ring, ring->descriptors_dma, 0); | |
324 | if (ring->is_tx) { | |
325 | ring_iowrite32desc(ring, ring->size, 12); | |
326 | ring_iowrite32options(ring, 0, 4); /* time releated ? */ | |
327 | ring_iowrite32options(ring, | |
328 | RING_FLAG_ENABLE | RING_FLAG_RAW, 0); | |
329 | } else { | |
330 | ring_iowrite32desc(ring, | |
331 | (TB_FRAME_SIZE << 16) | ring->size, 12); | |
332 | ring_iowrite32options(ring, 0xffffffff, 4); /* SOF EOF mask */ | |
333 | ring_iowrite32options(ring, | |
334 | RING_FLAG_ENABLE | RING_FLAG_RAW, 0); | |
335 | } | |
336 | ring_interrupt_active(ring, true); | |
337 | ring->running = true; | |
338 | err: | |
339 | mutex_unlock(&ring->lock); | |
340 | mutex_unlock(&ring->nhi->lock); | |
341 | } | |
342 | ||
343 | ||
344 | /** | |
345 | * ring_stop() - shutdown a ring | |
346 | * | |
347 | * Must not be invoked from a callback. | |
348 | * | |
349 | * This method will disable the ring. Further calls to ring_tx/ring_rx will | |
350 | * return -ESHUTDOWN until ring_stop has been called. | |
351 | * | |
352 | * All enqueued frames will be canceled and their callbacks will be executed | |
353 | * with frame->canceled set to true (on the callback thread). This method | |
354 | * returns only after all callback invocations have finished. | |
355 | */ | |
356 | void ring_stop(struct tb_ring *ring) | |
357 | { | |
358 | mutex_lock(&ring->nhi->lock); | |
359 | mutex_lock(&ring->lock); | |
360 | dev_info(&ring->nhi->pdev->dev, "stopping %s %d\n", | |
361 | RING_TYPE(ring), ring->hop); | |
362 | if (!ring->running) { | |
363 | dev_WARN(&ring->nhi->pdev->dev, "%s %d already stopped\n", | |
364 | RING_TYPE(ring), ring->hop); | |
365 | goto err; | |
366 | } | |
367 | ring_interrupt_active(ring, false); | |
368 | ||
369 | ring_iowrite32options(ring, 0, 0); | |
370 | ring_iowrite64desc(ring, 0, 0); | |
371 | ring_iowrite16desc(ring, 0, ring->is_tx ? 10 : 8); | |
372 | ring_iowrite32desc(ring, 0, 12); | |
373 | ring->head = 0; | |
374 | ring->tail = 0; | |
375 | ring->running = false; | |
376 | ||
377 | err: | |
378 | mutex_unlock(&ring->lock); | |
379 | mutex_unlock(&ring->nhi->lock); | |
380 | ||
381 | /* | |
382 | * schedule ring->work to invoke callbacks on all remaining frames. | |
383 | */ | |
384 | schedule_work(&ring->work); | |
385 | flush_work(&ring->work); | |
386 | } | |
387 | ||
388 | /* | |
389 | * ring_free() - free ring | |
390 | * | |
391 | * When this method returns all invocations of ring->callback will have | |
392 | * finished. | |
393 | * | |
394 | * Ring must be stopped. | |
395 | * | |
396 | * Must NOT be called from ring_frame->callback! | |
397 | */ | |
398 | void ring_free(struct tb_ring *ring) | |
399 | { | |
400 | mutex_lock(&ring->nhi->lock); | |
401 | /* | |
402 | * Dissociate the ring from the NHI. This also ensures that | |
403 | * nhi_interrupt_work cannot reschedule ring->work. | |
404 | */ | |
405 | if (ring->is_tx) | |
406 | ring->nhi->tx_rings[ring->hop] = NULL; | |
407 | else | |
408 | ring->nhi->rx_rings[ring->hop] = NULL; | |
409 | ||
410 | if (ring->running) { | |
411 | dev_WARN(&ring->nhi->pdev->dev, "%s %d still running\n", | |
412 | RING_TYPE(ring), ring->hop); | |
413 | } | |
414 | ||
415 | dma_free_coherent(&ring->nhi->pdev->dev, | |
416 | ring->size * sizeof(*ring->descriptors), | |
417 | ring->descriptors, ring->descriptors_dma); | |
418 | ||
f19b72c6 | 419 | ring->descriptors = NULL; |
16603153 AN |
420 | ring->descriptors_dma = 0; |
421 | ||
422 | ||
423 | dev_info(&ring->nhi->pdev->dev, | |
424 | "freeing %s %d\n", | |
425 | RING_TYPE(ring), | |
426 | ring->hop); | |
427 | ||
428 | mutex_unlock(&ring->nhi->lock); | |
429 | /** | |
430 | * ring->work can no longer be scheduled (it is scheduled only by | |
431 | * nhi_interrupt_work and ring_stop). Wait for it to finish before | |
432 | * freeing the ring. | |
433 | */ | |
434 | flush_work(&ring->work); | |
435 | mutex_destroy(&ring->lock); | |
436 | kfree(ring); | |
437 | } | |
438 | ||
439 | static void nhi_interrupt_work(struct work_struct *work) | |
440 | { | |
441 | struct tb_nhi *nhi = container_of(work, typeof(*nhi), interrupt_work); | |
442 | int value = 0; /* Suppress uninitialized usage warning. */ | |
443 | int bit; | |
444 | int hop = -1; | |
445 | int type = 0; /* current interrupt type 0: TX, 1: RX, 2: RX overflow */ | |
446 | struct tb_ring *ring; | |
447 | ||
448 | mutex_lock(&nhi->lock); | |
449 | ||
450 | /* | |
451 | * Starting at REG_RING_NOTIFY_BASE there are three status bitfields | |
452 | * (TX, RX, RX overflow). We iterate over the bits and read a new | |
453 | * dwords as required. The registers are cleared on read. | |
454 | */ | |
455 | for (bit = 0; bit < 3 * nhi->hop_count; bit++) { | |
456 | if (bit % 32 == 0) | |
457 | value = ioread32(nhi->iobase | |
458 | + REG_RING_NOTIFY_BASE | |
459 | + 4 * (bit / 32)); | |
460 | if (++hop == nhi->hop_count) { | |
461 | hop = 0; | |
462 | type++; | |
463 | } | |
464 | if ((value & (1 << (bit % 32))) == 0) | |
465 | continue; | |
466 | if (type == 2) { | |
467 | dev_warn(&nhi->pdev->dev, | |
468 | "RX overflow for ring %d\n", | |
469 | hop); | |
470 | continue; | |
471 | } | |
472 | if (type == 0) | |
473 | ring = nhi->tx_rings[hop]; | |
474 | else | |
475 | ring = nhi->rx_rings[hop]; | |
476 | if (ring == NULL) { | |
477 | dev_warn(&nhi->pdev->dev, | |
478 | "got interrupt for inactive %s ring %d\n", | |
479 | type ? "RX" : "TX", | |
480 | hop); | |
481 | continue; | |
482 | } | |
483 | /* we do not check ring->running, this is done in ring->work */ | |
484 | schedule_work(&ring->work); | |
485 | } | |
486 | mutex_unlock(&nhi->lock); | |
487 | } | |
488 | ||
489 | static irqreturn_t nhi_msi(int irq, void *data) | |
490 | { | |
491 | struct tb_nhi *nhi = data; | |
492 | schedule_work(&nhi->interrupt_work); | |
493 | return IRQ_HANDLED; | |
494 | } | |
495 | ||
23dd5bb4 AN |
496 | static int nhi_suspend_noirq(struct device *dev) |
497 | { | |
498 | struct pci_dev *pdev = to_pci_dev(dev); | |
499 | struct tb *tb = pci_get_drvdata(pdev); | |
500 | thunderbolt_suspend(tb); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static int nhi_resume_noirq(struct device *dev) | |
505 | { | |
506 | struct pci_dev *pdev = to_pci_dev(dev); | |
507 | struct tb *tb = pci_get_drvdata(pdev); | |
508 | thunderbolt_resume(tb); | |
509 | return 0; | |
510 | } | |
511 | ||
16603153 AN |
512 | static void nhi_shutdown(struct tb_nhi *nhi) |
513 | { | |
514 | int i; | |
515 | dev_info(&nhi->pdev->dev, "shutdown\n"); | |
516 | ||
517 | for (i = 0; i < nhi->hop_count; i++) { | |
518 | if (nhi->tx_rings[i]) | |
519 | dev_WARN(&nhi->pdev->dev, | |
520 | "TX ring %d is still active\n", i); | |
521 | if (nhi->rx_rings[i]) | |
522 | dev_WARN(&nhi->pdev->dev, | |
523 | "RX ring %d is still active\n", i); | |
524 | } | |
525 | nhi_disable_interrupts(nhi); | |
526 | /* | |
527 | * We have to release the irq before calling flush_work. Otherwise an | |
528 | * already executing IRQ handler could call schedule_work again. | |
529 | */ | |
530 | devm_free_irq(&nhi->pdev->dev, nhi->pdev->irq, nhi); | |
531 | flush_work(&nhi->interrupt_work); | |
532 | mutex_destroy(&nhi->lock); | |
533 | } | |
534 | ||
535 | static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) | |
536 | { | |
537 | struct tb_nhi *nhi; | |
d6cc51cd | 538 | struct tb *tb; |
16603153 AN |
539 | int res; |
540 | ||
541 | res = pcim_enable_device(pdev); | |
542 | if (res) { | |
543 | dev_err(&pdev->dev, "cannot enable PCI device, aborting\n"); | |
544 | return res; | |
545 | } | |
546 | ||
547 | res = pci_enable_msi(pdev); | |
548 | if (res) { | |
549 | dev_err(&pdev->dev, "cannot enable MSI, aborting\n"); | |
550 | return res; | |
551 | } | |
552 | ||
553 | res = pcim_iomap_regions(pdev, 1 << 0, "thunderbolt"); | |
554 | if (res) { | |
555 | dev_err(&pdev->dev, "cannot obtain PCI resources, aborting\n"); | |
556 | return res; | |
557 | } | |
558 | ||
559 | nhi = devm_kzalloc(&pdev->dev, sizeof(*nhi), GFP_KERNEL); | |
560 | if (!nhi) | |
561 | return -ENOMEM; | |
562 | ||
563 | nhi->pdev = pdev; | |
564 | /* cannot fail - table is allocated bin pcim_iomap_regions */ | |
565 | nhi->iobase = pcim_iomap_table(pdev)[0]; | |
566 | nhi->hop_count = ioread32(nhi->iobase + REG_HOP_COUNT) & 0x3ff; | |
567 | if (nhi->hop_count != 12) | |
568 | dev_warn(&pdev->dev, "unexpected hop count: %d\n", | |
569 | nhi->hop_count); | |
570 | INIT_WORK(&nhi->interrupt_work, nhi_interrupt_work); | |
571 | ||
2a211f32 HS |
572 | nhi->tx_rings = devm_kcalloc(&pdev->dev, nhi->hop_count, |
573 | sizeof(*nhi->tx_rings), GFP_KERNEL); | |
574 | nhi->rx_rings = devm_kcalloc(&pdev->dev, nhi->hop_count, | |
575 | sizeof(*nhi->rx_rings), GFP_KERNEL); | |
16603153 AN |
576 | if (!nhi->tx_rings || !nhi->rx_rings) |
577 | return -ENOMEM; | |
578 | ||
579 | nhi_disable_interrupts(nhi); /* In case someone left them on. */ | |
580 | res = devm_request_irq(&pdev->dev, pdev->irq, nhi_msi, | |
581 | IRQF_NO_SUSPEND, /* must work during _noirq */ | |
582 | "thunderbolt", nhi); | |
583 | if (res) { | |
584 | dev_err(&pdev->dev, "request_irq failed, aborting\n"); | |
585 | return res; | |
586 | } | |
587 | ||
588 | mutex_init(&nhi->lock); | |
589 | ||
590 | pci_set_master(pdev); | |
591 | ||
592 | /* magic value - clock related? */ | |
593 | iowrite32(3906250 / 10000, nhi->iobase + 0x38c00); | |
594 | ||
d6cc51cd AN |
595 | dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n"); |
596 | tb = thunderbolt_alloc_and_start(nhi); | |
597 | if (!tb) { | |
598 | /* | |
599 | * At this point the RX/TX rings might already have been | |
600 | * activated. Do a proper shutdown. | |
601 | */ | |
602 | nhi_shutdown(nhi); | |
603 | return -EIO; | |
604 | } | |
605 | pci_set_drvdata(pdev, tb); | |
16603153 AN |
606 | |
607 | return 0; | |
608 | } | |
609 | ||
610 | static void nhi_remove(struct pci_dev *pdev) | |
611 | { | |
d6cc51cd AN |
612 | struct tb *tb = pci_get_drvdata(pdev); |
613 | struct tb_nhi *nhi = tb->nhi; | |
614 | thunderbolt_shutdown_and_free(tb); | |
16603153 AN |
615 | nhi_shutdown(nhi); |
616 | } | |
617 | ||
23dd5bb4 AN |
618 | /* |
619 | * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable | |
620 | * the tunnels asap. A corresponding pci quirk blocks the downstream bridges | |
621 | * resume_noirq until we are done. | |
622 | */ | |
623 | static const struct dev_pm_ops nhi_pm_ops = { | |
624 | .suspend_noirq = nhi_suspend_noirq, | |
625 | .resume_noirq = nhi_resume_noirq, | |
626 | .freeze_noirq = nhi_suspend_noirq, /* | |
627 | * we just disable hotplug, the | |
628 | * pci-tunnels stay alive. | |
629 | */ | |
630 | .restore_noirq = nhi_resume_noirq, | |
631 | }; | |
632 | ||
620863f7 | 633 | static struct pci_device_id nhi_ids[] = { |
16603153 AN |
634 | /* |
635 | * We have to specify class, the TB bridges use the same device and | |
636 | * vendor (sub)id. | |
637 | */ | |
638 | { | |
639 | .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0, | |
640 | .vendor = PCI_VENDOR_ID_INTEL, .device = 0x1547, | |
641 | .subvendor = 0x2222, .subdevice = 0x1111, | |
642 | }, | |
643 | { | |
644 | .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0, | |
645 | .vendor = PCI_VENDOR_ID_INTEL, .device = 0x156c, | |
646 | .subvendor = 0x2222, .subdevice = 0x1111, | |
647 | }, | |
648 | { 0,} | |
649 | }; | |
650 | ||
651 | MODULE_DEVICE_TABLE(pci, nhi_ids); | |
652 | MODULE_LICENSE("GPL"); | |
653 | ||
654 | static struct pci_driver nhi_driver = { | |
655 | .name = "thunderbolt", | |
656 | .id_table = nhi_ids, | |
657 | .probe = nhi_probe, | |
658 | .remove = nhi_remove, | |
23dd5bb4 | 659 | .driver.pm = &nhi_pm_ops, |
16603153 AN |
660 | }; |
661 | ||
662 | static int __init nhi_init(void) | |
663 | { | |
664 | if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc.")) | |
665 | return -ENOSYS; | |
666 | return pci_register_driver(&nhi_driver); | |
667 | } | |
668 | ||
669 | static void __exit nhi_unload(void) | |
670 | { | |
671 | pci_unregister_driver(&nhi_driver); | |
672 | } | |
673 | ||
674 | module_init(nhi_init); | |
675 | module_exit(nhi_unload); |