]>
Commit | Line | Data |
---|---|---|
7f84eef0 SS |
1 | /* |
2 | * xHCI host controller driver | |
3 | * | |
4 | * Copyright (C) 2008 Intel Corp. | |
5 | * | |
6 | * Author: Sarah Sharp | |
7 | * Some code borrowed from the Linux EHCI driver. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
15 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | * for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software Foundation, | |
20 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
23 | /* | |
24 | * Ring initialization rules: | |
25 | * 1. Each segment is initialized to zero, except for link TRBs. | |
26 | * 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or | |
27 | * Consumer Cycle State (CCS), depending on ring function. | |
28 | * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment. | |
29 | * | |
30 | * Ring behavior rules: | |
31 | * 1. A ring is empty if enqueue == dequeue. This means there will always be at | |
32 | * least one free TRB in the ring. This is useful if you want to turn that | |
33 | * into a link TRB and expand the ring. | |
34 | * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a | |
35 | * link TRB, then load the pointer with the address in the link TRB. If the | |
36 | * link TRB had its toggle bit set, you may need to update the ring cycle | |
37 | * state (see cycle bit rules). You may have to do this multiple times | |
38 | * until you reach a non-link TRB. | |
39 | * 3. A ring is full if enqueue++ (for the definition of increment above) | |
40 | * equals the dequeue pointer. | |
41 | * | |
42 | * Cycle bit rules: | |
43 | * 1. When a consumer increments a dequeue pointer and encounters a toggle bit | |
44 | * in a link TRB, it must toggle the ring cycle state. | |
45 | * 2. When a producer increments an enqueue pointer and encounters a toggle bit | |
46 | * in a link TRB, it must toggle the ring cycle state. | |
47 | * | |
48 | * Producer rules: | |
49 | * 1. Check if ring is full before you enqueue. | |
50 | * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing. | |
51 | * Update enqueue pointer between each write (which may update the ring | |
52 | * cycle state). | |
53 | * 3. Notify consumer. If SW is producer, it rings the doorbell for command | |
54 | * and endpoint rings. If HC is the producer for the event ring, | |
55 | * and it generates an interrupt according to interrupt modulation rules. | |
56 | * | |
57 | * Consumer rules: | |
58 | * 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state, | |
59 | * the TRB is owned by the consumer. | |
60 | * 2. Update dequeue pointer (which may update the ring cycle state) and | |
61 | * continue processing TRBs until you reach a TRB which is not owned by you. | |
62 | * 3. Notify the producer. SW is the consumer for the event ring, and it | |
63 | * updates event ring dequeue pointer. HC is the consumer for the command and | |
64 | * endpoint rings; it generates events on the event ring for these. | |
65 | */ | |
66 | ||
8a96c052 | 67 | #include <linux/scatterlist.h> |
7f84eef0 SS |
68 | #include "xhci.h" |
69 | ||
70 | /* | |
71 | * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA | |
72 | * address of the TRB. | |
73 | */ | |
23e3be11 | 74 | dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, |
7f84eef0 SS |
75 | union xhci_trb *trb) |
76 | { | |
6071d836 | 77 | unsigned long segment_offset; |
7f84eef0 | 78 | |
6071d836 | 79 | if (!seg || !trb || trb < seg->trbs) |
7f84eef0 | 80 | return 0; |
6071d836 SS |
81 | /* offset in TRBs */ |
82 | segment_offset = trb - seg->trbs; | |
83 | if (segment_offset > TRBS_PER_SEGMENT) | |
7f84eef0 | 84 | return 0; |
6071d836 | 85 | return seg->dma + (segment_offset * sizeof(*trb)); |
7f84eef0 SS |
86 | } |
87 | ||
88 | /* Does this link TRB point to the first segment in a ring, | |
89 | * or was the previous TRB the last TRB on the last segment in the ERST? | |
90 | */ | |
91 | static inline bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
92 | struct xhci_segment *seg, union xhci_trb *trb) | |
93 | { | |
94 | if (ring == xhci->event_ring) | |
95 | return (trb == &seg->trbs[TRBS_PER_SEGMENT]) && | |
96 | (seg->next == xhci->event_ring->first_seg); | |
97 | else | |
98 | return trb->link.control & LINK_TOGGLE; | |
99 | } | |
100 | ||
101 | /* Is this TRB a link TRB or was the last TRB the last TRB in this event ring | |
102 | * segment? I.e. would the updated event TRB pointer step off the end of the | |
103 | * event seg? | |
104 | */ | |
105 | static inline int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
106 | struct xhci_segment *seg, union xhci_trb *trb) | |
107 | { | |
108 | if (ring == xhci->event_ring) | |
109 | return trb == &seg->trbs[TRBS_PER_SEGMENT]; | |
110 | else | |
111 | return (trb->link.control & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK); | |
112 | } | |
113 | ||
ae636747 SS |
114 | /* Updates trb to point to the next TRB in the ring, and updates seg if the next |
115 | * TRB is in a new segment. This does not skip over link TRBs, and it does not | |
116 | * effect the ring dequeue or enqueue pointers. | |
117 | */ | |
118 | static void next_trb(struct xhci_hcd *xhci, | |
119 | struct xhci_ring *ring, | |
120 | struct xhci_segment **seg, | |
121 | union xhci_trb **trb) | |
122 | { | |
123 | if (last_trb(xhci, ring, *seg, *trb)) { | |
124 | *seg = (*seg)->next; | |
125 | *trb = ((*seg)->trbs); | |
126 | } else { | |
127 | *trb = (*trb)++; | |
128 | } | |
129 | } | |
130 | ||
7f84eef0 SS |
131 | /* |
132 | * See Cycle bit rules. SW is the consumer for the event ring only. | |
133 | * Don't make a ring full of link TRBs. That would be dumb and this would loop. | |
134 | */ | |
135 | static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer) | |
136 | { | |
137 | union xhci_trb *next = ++(ring->dequeue); | |
66e49d87 | 138 | unsigned long long addr; |
7f84eef0 SS |
139 | |
140 | ring->deq_updates++; | |
141 | /* Update the dequeue pointer further if that was a link TRB or we're at | |
142 | * the end of an event ring segment (which doesn't have link TRBS) | |
143 | */ | |
144 | while (last_trb(xhci, ring, ring->deq_seg, next)) { | |
145 | if (consumer && last_trb_on_last_seg(xhci, ring, ring->deq_seg, next)) { | |
146 | ring->cycle_state = (ring->cycle_state ? 0 : 1); | |
147 | if (!in_interrupt()) | |
700e2052 GKH |
148 | xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n", |
149 | ring, | |
7f84eef0 SS |
150 | (unsigned int) ring->cycle_state); |
151 | } | |
152 | ring->deq_seg = ring->deq_seg->next; | |
153 | ring->dequeue = ring->deq_seg->trbs; | |
154 | next = ring->dequeue; | |
155 | } | |
66e49d87 SS |
156 | addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue); |
157 | if (ring == xhci->event_ring) | |
158 | xhci_dbg(xhci, "Event ring deq = 0x%llx (DMA)\n", addr); | |
159 | else if (ring == xhci->cmd_ring) | |
160 | xhci_dbg(xhci, "Command ring deq = 0x%llx (DMA)\n", addr); | |
161 | else | |
162 | xhci_dbg(xhci, "Ring deq = 0x%llx (DMA)\n", addr); | |
7f84eef0 SS |
163 | } |
164 | ||
165 | /* | |
166 | * See Cycle bit rules. SW is the consumer for the event ring only. | |
167 | * Don't make a ring full of link TRBs. That would be dumb and this would loop. | |
168 | * | |
169 | * If we've just enqueued a TRB that is in the middle of a TD (meaning the | |
170 | * chain bit is set), then set the chain bit in all the following link TRBs. | |
171 | * If we've enqueued the last TRB in a TD, make sure the following link TRBs | |
172 | * have their chain bit cleared (so that each Link TRB is a separate TD). | |
173 | * | |
174 | * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit | |
175 | * set, but other sections talk about dealing with the chain bit set. | |
176 | * Assume section 6.4.4.1 is wrong, and the chain bit can be set in a Link TRB. | |
177 | */ | |
178 | static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer) | |
179 | { | |
180 | u32 chain; | |
181 | union xhci_trb *next; | |
66e49d87 | 182 | unsigned long long addr; |
7f84eef0 SS |
183 | |
184 | chain = ring->enqueue->generic.field[3] & TRB_CHAIN; | |
185 | next = ++(ring->enqueue); | |
186 | ||
187 | ring->enq_updates++; | |
188 | /* Update the dequeue pointer further if that was a link TRB or we're at | |
189 | * the end of an event ring segment (which doesn't have link TRBS) | |
190 | */ | |
191 | while (last_trb(xhci, ring, ring->enq_seg, next)) { | |
192 | if (!consumer) { | |
193 | if (ring != xhci->event_ring) { | |
b7116ebc SS |
194 | next->link.control &= ~TRB_CHAIN; |
195 | next->link.control |= chain; | |
7f84eef0 | 196 | /* Give this link TRB to the hardware */ |
b7116ebc | 197 | wmb(); |
7f84eef0 SS |
198 | if (next->link.control & TRB_CYCLE) |
199 | next->link.control &= (u32) ~TRB_CYCLE; | |
200 | else | |
201 | next->link.control |= (u32) TRB_CYCLE; | |
7f84eef0 SS |
202 | } |
203 | /* Toggle the cycle bit after the last ring segment. */ | |
204 | if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) { | |
205 | ring->cycle_state = (ring->cycle_state ? 0 : 1); | |
206 | if (!in_interrupt()) | |
700e2052 GKH |
207 | xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n", |
208 | ring, | |
7f84eef0 SS |
209 | (unsigned int) ring->cycle_state); |
210 | } | |
211 | } | |
212 | ring->enq_seg = ring->enq_seg->next; | |
213 | ring->enqueue = ring->enq_seg->trbs; | |
214 | next = ring->enqueue; | |
215 | } | |
66e49d87 SS |
216 | addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue); |
217 | if (ring == xhci->event_ring) | |
218 | xhci_dbg(xhci, "Event ring enq = 0x%llx (DMA)\n", addr); | |
219 | else if (ring == xhci->cmd_ring) | |
220 | xhci_dbg(xhci, "Command ring enq = 0x%llx (DMA)\n", addr); | |
221 | else | |
222 | xhci_dbg(xhci, "Ring enq = 0x%llx (DMA)\n", addr); | |
7f84eef0 SS |
223 | } |
224 | ||
225 | /* | |
226 | * Check to see if there's room to enqueue num_trbs on the ring. See rules | |
227 | * above. | |
228 | * FIXME: this would be simpler and faster if we just kept track of the number | |
229 | * of free TRBs in a ring. | |
230 | */ | |
231 | static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
232 | unsigned int num_trbs) | |
233 | { | |
234 | int i; | |
235 | union xhci_trb *enq = ring->enqueue; | |
236 | struct xhci_segment *enq_seg = ring->enq_seg; | |
237 | ||
238 | /* Check if ring is empty */ | |
239 | if (enq == ring->dequeue) | |
240 | return 1; | |
241 | /* Make sure there's an extra empty TRB available */ | |
242 | for (i = 0; i <= num_trbs; ++i) { | |
243 | if (enq == ring->dequeue) | |
244 | return 0; | |
245 | enq++; | |
246 | while (last_trb(xhci, ring, enq_seg, enq)) { | |
247 | enq_seg = enq_seg->next; | |
248 | enq = enq_seg->trbs; | |
249 | } | |
250 | } | |
251 | return 1; | |
252 | } | |
253 | ||
23e3be11 | 254 | void xhci_set_hc_event_deq(struct xhci_hcd *xhci) |
7f84eef0 | 255 | { |
8e595a5d | 256 | u64 temp; |
7f84eef0 SS |
257 | dma_addr_t deq; |
258 | ||
23e3be11 | 259 | deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, |
7f84eef0 SS |
260 | xhci->event_ring->dequeue); |
261 | if (deq == 0 && !in_interrupt()) | |
262 | xhci_warn(xhci, "WARN something wrong with SW event ring " | |
263 | "dequeue ptr.\n"); | |
264 | /* Update HC event ring dequeue pointer */ | |
8e595a5d | 265 | temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); |
7f84eef0 | 266 | temp &= ERST_PTR_MASK; |
2d83109b SS |
267 | /* Don't clear the EHB bit (which is RW1C) because |
268 | * there might be more events to service. | |
269 | */ | |
270 | temp &= ~ERST_EHB; | |
66e49d87 | 271 | xhci_dbg(xhci, "// Write event ring dequeue pointer, preserving EHB bit\n"); |
8e595a5d SS |
272 | xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | temp, |
273 | &xhci->ir_set->erst_dequeue); | |
7f84eef0 SS |
274 | } |
275 | ||
276 | /* Ring the host controller doorbell after placing a command on the ring */ | |
23e3be11 | 277 | void xhci_ring_cmd_db(struct xhci_hcd *xhci) |
7f84eef0 SS |
278 | { |
279 | u32 temp; | |
280 | ||
281 | xhci_dbg(xhci, "// Ding dong!\n"); | |
282 | temp = xhci_readl(xhci, &xhci->dba->doorbell[0]) & DB_MASK; | |
283 | xhci_writel(xhci, temp | DB_TARGET_HOST, &xhci->dba->doorbell[0]); | |
284 | /* Flush PCI posted writes */ | |
285 | xhci_readl(xhci, &xhci->dba->doorbell[0]); | |
286 | } | |
287 | ||
ae636747 SS |
288 | static void ring_ep_doorbell(struct xhci_hcd *xhci, |
289 | unsigned int slot_id, | |
290 | unsigned int ep_index) | |
291 | { | |
292 | struct xhci_ring *ep_ring; | |
293 | u32 field; | |
294 | __u32 __iomem *db_addr = &xhci->dba->doorbell[slot_id]; | |
295 | ||
296 | ep_ring = xhci->devs[slot_id]->ep_rings[ep_index]; | |
297 | /* Don't ring the doorbell for this endpoint if there are pending | |
298 | * cancellations because the we don't want to interrupt processing. | |
299 | */ | |
a1587d97 SS |
300 | if (!ep_ring->cancels_pending && !(ep_ring->state & SET_DEQ_PENDING) |
301 | && !(ep_ring->state & EP_HALTED)) { | |
ae636747 SS |
302 | field = xhci_readl(xhci, db_addr) & DB_MASK; |
303 | xhci_writel(xhci, field | EPI_TO_DB(ep_index), db_addr); | |
304 | /* Flush PCI posted writes - FIXME Matthew Wilcox says this | |
305 | * isn't time-critical and we shouldn't make the CPU wait for | |
306 | * the flush. | |
307 | */ | |
308 | xhci_readl(xhci, db_addr); | |
309 | } | |
310 | } | |
311 | ||
312 | /* | |
313 | * Find the segment that trb is in. Start searching in start_seg. | |
314 | * If we must move past a segment that has a link TRB with a toggle cycle state | |
315 | * bit set, then we will toggle the value pointed at by cycle_state. | |
316 | */ | |
317 | static struct xhci_segment *find_trb_seg( | |
318 | struct xhci_segment *start_seg, | |
319 | union xhci_trb *trb, int *cycle_state) | |
320 | { | |
321 | struct xhci_segment *cur_seg = start_seg; | |
322 | struct xhci_generic_trb *generic_trb; | |
323 | ||
324 | while (cur_seg->trbs > trb || | |
325 | &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) { | |
326 | generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic; | |
327 | if (TRB_TYPE(generic_trb->field[3]) == TRB_LINK && | |
328 | (generic_trb->field[3] & LINK_TOGGLE)) | |
329 | *cycle_state = ~(*cycle_state) & 0x1; | |
330 | cur_seg = cur_seg->next; | |
331 | if (cur_seg == start_seg) | |
332 | /* Looped over the entire list. Oops! */ | |
333 | return 0; | |
334 | } | |
335 | return cur_seg; | |
336 | } | |
337 | ||
ae636747 SS |
338 | /* |
339 | * Move the xHC's endpoint ring dequeue pointer past cur_td. | |
340 | * Record the new state of the xHC's endpoint ring dequeue segment, | |
341 | * dequeue pointer, and new consumer cycle state in state. | |
342 | * Update our internal representation of the ring's dequeue pointer. | |
343 | * | |
344 | * We do this in three jumps: | |
345 | * - First we update our new ring state to be the same as when the xHC stopped. | |
346 | * - Then we traverse the ring to find the segment that contains | |
347 | * the last TRB in the TD. We toggle the xHC's new cycle state when we pass | |
348 | * any link TRBs with the toggle cycle bit set. | |
349 | * - Finally we move the dequeue state one TRB further, toggling the cycle bit | |
350 | * if we've moved it past a link TRB with the toggle cycle bit set. | |
351 | */ | |
c92bcfa7 | 352 | void xhci_find_new_dequeue_state(struct xhci_hcd *xhci, |
ae636747 | 353 | unsigned int slot_id, unsigned int ep_index, |
c92bcfa7 | 354 | struct xhci_td *cur_td, struct xhci_dequeue_state *state) |
ae636747 SS |
355 | { |
356 | struct xhci_virt_device *dev = xhci->devs[slot_id]; | |
357 | struct xhci_ring *ep_ring = dev->ep_rings[ep_index]; | |
358 | struct xhci_generic_trb *trb; | |
d115b048 | 359 | struct xhci_ep_ctx *ep_ctx; |
c92bcfa7 | 360 | dma_addr_t addr; |
ae636747 SS |
361 | |
362 | state->new_cycle_state = 0; | |
c92bcfa7 | 363 | xhci_dbg(xhci, "Finding segment containing stopped TRB.\n"); |
ae636747 SS |
364 | state->new_deq_seg = find_trb_seg(cur_td->start_seg, |
365 | ep_ring->stopped_trb, | |
366 | &state->new_cycle_state); | |
367 | if (!state->new_deq_seg) | |
368 | BUG(); | |
369 | /* Dig out the cycle state saved by the xHC during the stop ep cmd */ | |
c92bcfa7 | 370 | xhci_dbg(xhci, "Finding endpoint context\n"); |
d115b048 JY |
371 | ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); |
372 | state->new_cycle_state = 0x1 & ep_ctx->deq; | |
ae636747 SS |
373 | |
374 | state->new_deq_ptr = cur_td->last_trb; | |
c92bcfa7 | 375 | xhci_dbg(xhci, "Finding segment containing last TRB in TD.\n"); |
ae636747 SS |
376 | state->new_deq_seg = find_trb_seg(state->new_deq_seg, |
377 | state->new_deq_ptr, | |
378 | &state->new_cycle_state); | |
379 | if (!state->new_deq_seg) | |
380 | BUG(); | |
381 | ||
382 | trb = &state->new_deq_ptr->generic; | |
383 | if (TRB_TYPE(trb->field[3]) == TRB_LINK && | |
384 | (trb->field[3] & LINK_TOGGLE)) | |
385 | state->new_cycle_state = ~(state->new_cycle_state) & 0x1; | |
386 | next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr); | |
387 | ||
388 | /* Don't update the ring cycle state for the producer (us). */ | |
c92bcfa7 SS |
389 | xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n", |
390 | state->new_deq_seg); | |
391 | addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr); | |
392 | xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n", | |
393 | (unsigned long long) addr); | |
394 | xhci_dbg(xhci, "Setting dequeue pointer in internal ring state.\n"); | |
ae636747 SS |
395 | ep_ring->dequeue = state->new_deq_ptr; |
396 | ep_ring->deq_seg = state->new_deq_seg; | |
397 | } | |
398 | ||
23e3be11 | 399 | static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, |
ae636747 SS |
400 | struct xhci_td *cur_td) |
401 | { | |
402 | struct xhci_segment *cur_seg; | |
403 | union xhci_trb *cur_trb; | |
404 | ||
405 | for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb; | |
406 | true; | |
407 | next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { | |
408 | if ((cur_trb->generic.field[3] & TRB_TYPE_BITMASK) == | |
409 | TRB_TYPE(TRB_LINK)) { | |
410 | /* Unchain any chained Link TRBs, but | |
411 | * leave the pointers intact. | |
412 | */ | |
413 | cur_trb->generic.field[3] &= ~TRB_CHAIN; | |
414 | xhci_dbg(xhci, "Cancel (unchain) link TRB\n"); | |
700e2052 GKH |
415 | xhci_dbg(xhci, "Address = %p (0x%llx dma); " |
416 | "in seg %p (0x%llx dma)\n", | |
417 | cur_trb, | |
23e3be11 | 418 | (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb), |
700e2052 GKH |
419 | cur_seg, |
420 | (unsigned long long)cur_seg->dma); | |
ae636747 SS |
421 | } else { |
422 | cur_trb->generic.field[0] = 0; | |
423 | cur_trb->generic.field[1] = 0; | |
424 | cur_trb->generic.field[2] = 0; | |
425 | /* Preserve only the cycle bit of this TRB */ | |
426 | cur_trb->generic.field[3] &= TRB_CYCLE; | |
427 | cur_trb->generic.field[3] |= TRB_TYPE(TRB_TR_NOOP); | |
700e2052 GKH |
428 | xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) " |
429 | "in seg %p (0x%llx dma)\n", | |
430 | cur_trb, | |
23e3be11 | 431 | (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb), |
700e2052 GKH |
432 | cur_seg, |
433 | (unsigned long long)cur_seg->dma); | |
ae636747 SS |
434 | } |
435 | if (cur_trb == cur_td->last_trb) | |
436 | break; | |
437 | } | |
438 | } | |
439 | ||
440 | static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id, | |
441 | unsigned int ep_index, struct xhci_segment *deq_seg, | |
442 | union xhci_trb *deq_ptr, u32 cycle_state); | |
443 | ||
c92bcfa7 SS |
444 | void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci, |
445 | struct xhci_ring *ep_ring, unsigned int slot_id, | |
446 | unsigned int ep_index, struct xhci_dequeue_state *deq_state) | |
447 | { | |
448 | xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), " | |
449 | "new deq ptr = %p (0x%llx dma), new cycle = %u\n", | |
450 | deq_state->new_deq_seg, | |
451 | (unsigned long long)deq_state->new_deq_seg->dma, | |
452 | deq_state->new_deq_ptr, | |
453 | (unsigned long long)xhci_trb_virt_to_dma(deq_state->new_deq_seg, deq_state->new_deq_ptr), | |
454 | deq_state->new_cycle_state); | |
455 | queue_set_tr_deq(xhci, slot_id, ep_index, | |
456 | deq_state->new_deq_seg, | |
457 | deq_state->new_deq_ptr, | |
458 | (u32) deq_state->new_cycle_state); | |
459 | /* Stop the TD queueing code from ringing the doorbell until | |
460 | * this command completes. The HC won't set the dequeue pointer | |
461 | * if the ring is running, and ringing the doorbell starts the | |
462 | * ring running. | |
463 | */ | |
464 | ep_ring->state |= SET_DEQ_PENDING; | |
465 | xhci_ring_cmd_db(xhci); | |
466 | } | |
467 | ||
ae636747 SS |
468 | /* |
469 | * When we get a command completion for a Stop Endpoint Command, we need to | |
470 | * unlink any cancelled TDs from the ring. There are two ways to do that: | |
471 | * | |
472 | * 1. If the HW was in the middle of processing the TD that needs to be | |
473 | * cancelled, then we must move the ring's dequeue pointer past the last TRB | |
474 | * in the TD with a Set Dequeue Pointer Command. | |
475 | * 2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain | |
476 | * bit cleared) so that the HW will skip over them. | |
477 | */ | |
478 | static void handle_stopped_endpoint(struct xhci_hcd *xhci, | |
479 | union xhci_trb *trb) | |
480 | { | |
481 | unsigned int slot_id; | |
482 | unsigned int ep_index; | |
483 | struct xhci_ring *ep_ring; | |
484 | struct list_head *entry; | |
485 | struct xhci_td *cur_td = 0; | |
486 | struct xhci_td *last_unlinked_td; | |
487 | ||
c92bcfa7 | 488 | struct xhci_dequeue_state deq_state; |
ae636747 SS |
489 | #ifdef CONFIG_USB_HCD_STAT |
490 | ktime_t stop_time = ktime_get(); | |
491 | #endif | |
492 | ||
493 | memset(&deq_state, 0, sizeof(deq_state)); | |
494 | slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]); | |
495 | ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]); | |
496 | ep_ring = xhci->devs[slot_id]->ep_rings[ep_index]; | |
497 | ||
498 | if (list_empty(&ep_ring->cancelled_td_list)) | |
499 | return; | |
500 | ||
501 | /* Fix up the ep ring first, so HW stops executing cancelled TDs. | |
502 | * We have the xHCI lock, so nothing can modify this list until we drop | |
503 | * it. We're also in the event handler, so we can't get re-interrupted | |
504 | * if another Stop Endpoint command completes | |
505 | */ | |
506 | list_for_each(entry, &ep_ring->cancelled_td_list) { | |
507 | cur_td = list_entry(entry, struct xhci_td, cancelled_td_list); | |
700e2052 GKH |
508 | xhci_dbg(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n", |
509 | cur_td->first_trb, | |
23e3be11 | 510 | (unsigned long long)xhci_trb_virt_to_dma(cur_td->start_seg, cur_td->first_trb)); |
ae636747 SS |
511 | /* |
512 | * If we stopped on the TD we need to cancel, then we have to | |
513 | * move the xHC endpoint ring dequeue pointer past this TD. | |
514 | */ | |
515 | if (cur_td == ep_ring->stopped_td) | |
c92bcfa7 | 516 | xhci_find_new_dequeue_state(xhci, slot_id, ep_index, cur_td, |
ae636747 SS |
517 | &deq_state); |
518 | else | |
519 | td_to_noop(xhci, ep_ring, cur_td); | |
520 | /* | |
521 | * The event handler won't see a completion for this TD anymore, | |
522 | * so remove it from the endpoint ring's TD list. Keep it in | |
523 | * the cancelled TD list for URB completion later. | |
524 | */ | |
525 | list_del(&cur_td->td_list); | |
526 | ep_ring->cancels_pending--; | |
527 | } | |
528 | last_unlinked_td = cur_td; | |
529 | ||
530 | /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */ | |
531 | if (deq_state.new_deq_ptr && deq_state.new_deq_seg) { | |
c92bcfa7 SS |
532 | xhci_queue_new_dequeue_state(xhci, ep_ring, |
533 | slot_id, ep_index, &deq_state); | |
ae636747 SS |
534 | } else { |
535 | /* Otherwise just ring the doorbell to restart the ring */ | |
536 | ring_ep_doorbell(xhci, slot_id, ep_index); | |
537 | } | |
538 | ||
539 | /* | |
540 | * Drop the lock and complete the URBs in the cancelled TD list. | |
541 | * New TDs to be cancelled might be added to the end of the list before | |
542 | * we can complete all the URBs for the TDs we already unlinked. | |
543 | * So stop when we've completed the URB for the last TD we unlinked. | |
544 | */ | |
545 | do { | |
546 | cur_td = list_entry(ep_ring->cancelled_td_list.next, | |
547 | struct xhci_td, cancelled_td_list); | |
548 | list_del(&cur_td->cancelled_td_list); | |
549 | ||
550 | /* Clean up the cancelled URB */ | |
551 | #ifdef CONFIG_USB_HCD_STAT | |
552 | hcd_stat_update(xhci->tp_stat, cur_td->urb->actual_length, | |
553 | ktime_sub(stop_time, cur_td->start_time)); | |
554 | #endif | |
555 | cur_td->urb->hcpriv = NULL; | |
556 | usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), cur_td->urb); | |
557 | ||
700e2052 | 558 | xhci_dbg(xhci, "Giveback cancelled URB %p\n", cur_td->urb); |
ae636747 SS |
559 | spin_unlock(&xhci->lock); |
560 | /* Doesn't matter what we pass for status, since the core will | |
561 | * just overwrite it (because the URB has been unlinked). | |
562 | */ | |
563 | usb_hcd_giveback_urb(xhci_to_hcd(xhci), cur_td->urb, 0); | |
564 | kfree(cur_td); | |
565 | ||
566 | spin_lock(&xhci->lock); | |
567 | } while (cur_td != last_unlinked_td); | |
568 | ||
569 | /* Return to the event handler with xhci->lock re-acquired */ | |
570 | } | |
571 | ||
572 | /* | |
573 | * When we get a completion for a Set Transfer Ring Dequeue Pointer command, | |
574 | * we need to clear the set deq pending flag in the endpoint ring state, so that | |
575 | * the TD queueing code can ring the doorbell again. We also need to ring the | |
576 | * endpoint doorbell to restart the ring, but only if there aren't more | |
577 | * cancellations pending. | |
578 | */ | |
579 | static void handle_set_deq_completion(struct xhci_hcd *xhci, | |
580 | struct xhci_event_cmd *event, | |
581 | union xhci_trb *trb) | |
582 | { | |
583 | unsigned int slot_id; | |
584 | unsigned int ep_index; | |
585 | struct xhci_ring *ep_ring; | |
586 | struct xhci_virt_device *dev; | |
d115b048 JY |
587 | struct xhci_ep_ctx *ep_ctx; |
588 | struct xhci_slot_ctx *slot_ctx; | |
ae636747 SS |
589 | |
590 | slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]); | |
591 | ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]); | |
592 | dev = xhci->devs[slot_id]; | |
593 | ep_ring = dev->ep_rings[ep_index]; | |
d115b048 JY |
594 | ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); |
595 | slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx); | |
ae636747 SS |
596 | |
597 | if (GET_COMP_CODE(event->status) != COMP_SUCCESS) { | |
598 | unsigned int ep_state; | |
599 | unsigned int slot_state; | |
600 | ||
601 | switch (GET_COMP_CODE(event->status)) { | |
602 | case COMP_TRB_ERR: | |
603 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because " | |
604 | "of stream ID configuration\n"); | |
605 | break; | |
606 | case COMP_CTX_STATE: | |
607 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due " | |
608 | "to incorrect slot or ep state.\n"); | |
d115b048 | 609 | ep_state = ep_ctx->ep_info; |
ae636747 | 610 | ep_state &= EP_STATE_MASK; |
d115b048 | 611 | slot_state = slot_ctx->dev_state; |
ae636747 SS |
612 | slot_state = GET_SLOT_STATE(slot_state); |
613 | xhci_dbg(xhci, "Slot state = %u, EP state = %u\n", | |
614 | slot_state, ep_state); | |
615 | break; | |
616 | case COMP_EBADSLT: | |
617 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because " | |
618 | "slot %u was not enabled.\n", slot_id); | |
619 | break; | |
620 | default: | |
621 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown " | |
622 | "completion code of %u.\n", | |
623 | GET_COMP_CODE(event->status)); | |
624 | break; | |
625 | } | |
626 | /* OK what do we do now? The endpoint state is hosed, and we | |
627 | * should never get to this point if the synchronization between | |
628 | * queueing, and endpoint state are correct. This might happen | |
629 | * if the device gets disconnected after we've finished | |
630 | * cancelling URBs, which might not be an error... | |
631 | */ | |
632 | } else { | |
8e595a5d | 633 | xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n", |
d115b048 | 634 | ep_ctx->deq); |
ae636747 SS |
635 | } |
636 | ||
637 | ep_ring->state &= ~SET_DEQ_PENDING; | |
638 | ring_ep_doorbell(xhci, slot_id, ep_index); | |
639 | } | |
640 | ||
a1587d97 SS |
641 | static void handle_reset_ep_completion(struct xhci_hcd *xhci, |
642 | struct xhci_event_cmd *event, | |
643 | union xhci_trb *trb) | |
644 | { | |
645 | int slot_id; | |
646 | unsigned int ep_index; | |
647 | ||
648 | slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]); | |
649 | ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]); | |
650 | /* This command will only fail if the endpoint wasn't halted, | |
651 | * but we don't care. | |
652 | */ | |
653 | xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n", | |
654 | (unsigned int) GET_COMP_CODE(event->status)); | |
655 | ||
656 | /* Clear our internal halted state and restart the ring */ | |
657 | xhci->devs[slot_id]->ep_rings[ep_index]->state &= ~EP_HALTED; | |
658 | ring_ep_doorbell(xhci, slot_id, ep_index); | |
659 | } | |
ae636747 | 660 | |
7f84eef0 SS |
661 | static void handle_cmd_completion(struct xhci_hcd *xhci, |
662 | struct xhci_event_cmd *event) | |
663 | { | |
3ffbba95 | 664 | int slot_id = TRB_TO_SLOT_ID(event->flags); |
7f84eef0 SS |
665 | u64 cmd_dma; |
666 | dma_addr_t cmd_dequeue_dma; | |
667 | ||
8e595a5d | 668 | cmd_dma = event->cmd_trb; |
23e3be11 | 669 | cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, |
7f84eef0 SS |
670 | xhci->cmd_ring->dequeue); |
671 | /* Is the command ring deq ptr out of sync with the deq seg ptr? */ | |
672 | if (cmd_dequeue_dma == 0) { | |
673 | xhci->error_bitmask |= 1 << 4; | |
674 | return; | |
675 | } | |
676 | /* Does the DMA address match our internal dequeue pointer address? */ | |
677 | if (cmd_dma != (u64) cmd_dequeue_dma) { | |
678 | xhci->error_bitmask |= 1 << 5; | |
679 | return; | |
680 | } | |
681 | switch (xhci->cmd_ring->dequeue->generic.field[3] & TRB_TYPE_BITMASK) { | |
3ffbba95 SS |
682 | case TRB_TYPE(TRB_ENABLE_SLOT): |
683 | if (GET_COMP_CODE(event->status) == COMP_SUCCESS) | |
684 | xhci->slot_id = slot_id; | |
685 | else | |
686 | xhci->slot_id = 0; | |
687 | complete(&xhci->addr_dev); | |
688 | break; | |
689 | case TRB_TYPE(TRB_DISABLE_SLOT): | |
690 | if (xhci->devs[slot_id]) | |
691 | xhci_free_virt_device(xhci, slot_id); | |
692 | break; | |
f94e0186 SS |
693 | case TRB_TYPE(TRB_CONFIG_EP): |
694 | xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status); | |
695 | complete(&xhci->devs[slot_id]->cmd_completion); | |
696 | break; | |
3ffbba95 SS |
697 | case TRB_TYPE(TRB_ADDR_DEV): |
698 | xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status); | |
699 | complete(&xhci->addr_dev); | |
700 | break; | |
ae636747 SS |
701 | case TRB_TYPE(TRB_STOP_RING): |
702 | handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue); | |
703 | break; | |
704 | case TRB_TYPE(TRB_SET_DEQ): | |
705 | handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue); | |
706 | break; | |
7f84eef0 SS |
707 | case TRB_TYPE(TRB_CMD_NOOP): |
708 | ++xhci->noops_handled; | |
709 | break; | |
a1587d97 SS |
710 | case TRB_TYPE(TRB_RESET_EP): |
711 | handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue); | |
712 | break; | |
7f84eef0 SS |
713 | default: |
714 | /* Skip over unknown commands on the event ring */ | |
715 | xhci->error_bitmask |= 1 << 6; | |
716 | break; | |
717 | } | |
718 | inc_deq(xhci, xhci->cmd_ring, false); | |
719 | } | |
720 | ||
0f2a7930 SS |
721 | static void handle_port_status(struct xhci_hcd *xhci, |
722 | union xhci_trb *event) | |
723 | { | |
724 | u32 port_id; | |
725 | ||
726 | /* Port status change events always have a successful completion code */ | |
727 | if (GET_COMP_CODE(event->generic.field[2]) != COMP_SUCCESS) { | |
728 | xhci_warn(xhci, "WARN: xHC returned failed port status event\n"); | |
729 | xhci->error_bitmask |= 1 << 8; | |
730 | } | |
731 | /* FIXME: core doesn't care about all port link state changes yet */ | |
732 | port_id = GET_PORT_ID(event->generic.field[0]); | |
733 | xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id); | |
734 | ||
735 | /* Update event ring dequeue pointer before dropping the lock */ | |
736 | inc_deq(xhci, xhci->event_ring, true); | |
23e3be11 | 737 | xhci_set_hc_event_deq(xhci); |
0f2a7930 SS |
738 | |
739 | spin_unlock(&xhci->lock); | |
740 | /* Pass this up to the core */ | |
741 | usb_hcd_poll_rh_status(xhci_to_hcd(xhci)); | |
742 | spin_lock(&xhci->lock); | |
743 | } | |
744 | ||
d0e96f5a SS |
745 | /* |
746 | * This TD is defined by the TRBs starting at start_trb in start_seg and ending | |
747 | * at end_trb, which may be in another segment. If the suspect DMA address is a | |
748 | * TRB in this TD, this function returns that TRB's segment. Otherwise it | |
749 | * returns 0. | |
750 | */ | |
751 | static struct xhci_segment *trb_in_td( | |
752 | struct xhci_segment *start_seg, | |
753 | union xhci_trb *start_trb, | |
754 | union xhci_trb *end_trb, | |
755 | dma_addr_t suspect_dma) | |
756 | { | |
757 | dma_addr_t start_dma; | |
758 | dma_addr_t end_seg_dma; | |
759 | dma_addr_t end_trb_dma; | |
760 | struct xhci_segment *cur_seg; | |
761 | ||
23e3be11 | 762 | start_dma = xhci_trb_virt_to_dma(start_seg, start_trb); |
d0e96f5a SS |
763 | cur_seg = start_seg; |
764 | ||
765 | do { | |
ae636747 | 766 | /* We may get an event for a Link TRB in the middle of a TD */ |
23e3be11 | 767 | end_seg_dma = xhci_trb_virt_to_dma(cur_seg, |
ae636747 | 768 | &start_seg->trbs[TRBS_PER_SEGMENT - 1]); |
d0e96f5a | 769 | /* If the end TRB isn't in this segment, this is set to 0 */ |
23e3be11 | 770 | end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb); |
d0e96f5a SS |
771 | |
772 | if (end_trb_dma > 0) { | |
773 | /* The end TRB is in this segment, so suspect should be here */ | |
774 | if (start_dma <= end_trb_dma) { | |
775 | if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma) | |
776 | return cur_seg; | |
777 | } else { | |
778 | /* Case for one segment with | |
779 | * a TD wrapped around to the top | |
780 | */ | |
781 | if ((suspect_dma >= start_dma && | |
782 | suspect_dma <= end_seg_dma) || | |
783 | (suspect_dma >= cur_seg->dma && | |
784 | suspect_dma <= end_trb_dma)) | |
785 | return cur_seg; | |
786 | } | |
787 | return 0; | |
788 | } else { | |
789 | /* Might still be somewhere in this segment */ | |
790 | if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma) | |
791 | return cur_seg; | |
792 | } | |
793 | cur_seg = cur_seg->next; | |
23e3be11 | 794 | start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]); |
d0e96f5a SS |
795 | } while (1); |
796 | ||
797 | } | |
798 | ||
799 | /* | |
800 | * If this function returns an error condition, it means it got a Transfer | |
801 | * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address. | |
802 | * At this point, the host controller is probably hosed and should be reset. | |
803 | */ | |
804 | static int handle_tx_event(struct xhci_hcd *xhci, | |
805 | struct xhci_transfer_event *event) | |
806 | { | |
807 | struct xhci_virt_device *xdev; | |
808 | struct xhci_ring *ep_ring; | |
809 | int ep_index; | |
810 | struct xhci_td *td = 0; | |
811 | dma_addr_t event_dma; | |
812 | struct xhci_segment *event_seg; | |
813 | union xhci_trb *event_trb; | |
ae636747 | 814 | struct urb *urb = 0; |
d0e96f5a | 815 | int status = -EINPROGRESS; |
d115b048 | 816 | struct xhci_ep_ctx *ep_ctx; |
d0e96f5a | 817 | |
66e49d87 | 818 | xhci_dbg(xhci, "In %s\n", __func__); |
d0e96f5a SS |
819 | xdev = xhci->devs[TRB_TO_SLOT_ID(event->flags)]; |
820 | if (!xdev) { | |
821 | xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n"); | |
822 | return -ENODEV; | |
823 | } | |
824 | ||
825 | /* Endpoint ID is 1 based, our index is zero based */ | |
826 | ep_index = TRB_TO_EP_ID(event->flags) - 1; | |
66e49d87 | 827 | xhci_dbg(xhci, "%s - ep index = %d\n", __func__, ep_index); |
d0e96f5a | 828 | ep_ring = xdev->ep_rings[ep_index]; |
d115b048 JY |
829 | ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
830 | if (!ep_ring || (ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED) { | |
d0e96f5a SS |
831 | xhci_err(xhci, "ERROR Transfer event pointed to disabled endpoint\n"); |
832 | return -ENODEV; | |
833 | } | |
834 | ||
8e595a5d | 835 | event_dma = event->buffer; |
d0e96f5a | 836 | /* This TRB should be in the TD at the head of this ring's TD list */ |
66e49d87 | 837 | xhci_dbg(xhci, "%s - checking for list empty\n", __func__); |
d0e96f5a SS |
838 | if (list_empty(&ep_ring->td_list)) { |
839 | xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n", | |
840 | TRB_TO_SLOT_ID(event->flags), ep_index); | |
841 | xhci_dbg(xhci, "Event TRB with TRB type ID %u\n", | |
842 | (unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10); | |
843 | xhci_print_trb_offsets(xhci, (union xhci_trb *) event); | |
844 | urb = NULL; | |
845 | goto cleanup; | |
846 | } | |
66e49d87 | 847 | xhci_dbg(xhci, "%s - getting list entry\n", __func__); |
d0e96f5a SS |
848 | td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list); |
849 | ||
850 | /* Is this a TRB in the currently executing TD? */ | |
66e49d87 | 851 | xhci_dbg(xhci, "%s - looking for TD\n", __func__); |
d0e96f5a SS |
852 | event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue, |
853 | td->last_trb, event_dma); | |
66e49d87 | 854 | xhci_dbg(xhci, "%s - found event_seg = %p\n", __func__, event_seg); |
d0e96f5a SS |
855 | if (!event_seg) { |
856 | /* HC is busted, give up! */ | |
857 | xhci_err(xhci, "ERROR Transfer event TRB DMA ptr not part of current TD\n"); | |
858 | return -ESHUTDOWN; | |
859 | } | |
860 | event_trb = &event_seg->trbs[(event_dma - event_seg->dma) / sizeof(*event_trb)]; | |
b10de142 SS |
861 | xhci_dbg(xhci, "Event TRB with TRB type ID %u\n", |
862 | (unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10); | |
8e595a5d SS |
863 | xhci_dbg(xhci, "Offset 0x00 (buffer lo) = 0x%x\n", |
864 | lower_32_bits(event->buffer)); | |
865 | xhci_dbg(xhci, "Offset 0x04 (buffer hi) = 0x%x\n", | |
866 | upper_32_bits(event->buffer)); | |
b10de142 SS |
867 | xhci_dbg(xhci, "Offset 0x08 (transfer length) = 0x%x\n", |
868 | (unsigned int) event->transfer_len); | |
869 | xhci_dbg(xhci, "Offset 0x0C (flags) = 0x%x\n", | |
870 | (unsigned int) event->flags); | |
871 | ||
872 | /* Look for common error cases */ | |
873 | switch (GET_COMP_CODE(event->transfer_len)) { | |
874 | /* Skip codes that require special handling depending on | |
875 | * transfer type | |
876 | */ | |
877 | case COMP_SUCCESS: | |
878 | case COMP_SHORT_TX: | |
879 | break; | |
ae636747 SS |
880 | case COMP_STOP: |
881 | xhci_dbg(xhci, "Stopped on Transfer TRB\n"); | |
882 | break; | |
883 | case COMP_STOP_INVAL: | |
884 | xhci_dbg(xhci, "Stopped on No-op or Link TRB\n"); | |
885 | break; | |
b10de142 SS |
886 | case COMP_STALL: |
887 | xhci_warn(xhci, "WARN: Stalled endpoint\n"); | |
a1587d97 | 888 | ep_ring->state |= EP_HALTED; |
b10de142 SS |
889 | status = -EPIPE; |
890 | break; | |
891 | case COMP_TRB_ERR: | |
892 | xhci_warn(xhci, "WARN: TRB error on endpoint\n"); | |
893 | status = -EILSEQ; | |
894 | break; | |
895 | case COMP_TX_ERR: | |
896 | xhci_warn(xhci, "WARN: transfer error on endpoint\n"); | |
897 | status = -EPROTO; | |
898 | break; | |
4a73143c SS |
899 | case COMP_BABBLE: |
900 | xhci_warn(xhci, "WARN: babble error on endpoint\n"); | |
901 | status = -EOVERFLOW; | |
902 | break; | |
b10de142 SS |
903 | case COMP_DB_ERR: |
904 | xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n"); | |
905 | status = -ENOSR; | |
906 | break; | |
907 | default: | |
908 | xhci_warn(xhci, "ERROR Unknown event condition, HC probably busted\n"); | |
909 | urb = NULL; | |
910 | goto cleanup; | |
911 | } | |
d0e96f5a SS |
912 | /* Now update the urb's actual_length and give back to the core */ |
913 | /* Was this a control transfer? */ | |
914 | if (usb_endpoint_xfer_control(&td->urb->ep->desc)) { | |
915 | xhci_debug_trb(xhci, xhci->event_ring->dequeue); | |
916 | switch (GET_COMP_CODE(event->transfer_len)) { | |
917 | case COMP_SUCCESS: | |
918 | if (event_trb == ep_ring->dequeue) { | |
919 | xhci_warn(xhci, "WARN: Success on ctrl setup TRB without IOC set??\n"); | |
920 | status = -ESHUTDOWN; | |
921 | } else if (event_trb != td->last_trb) { | |
922 | xhci_warn(xhci, "WARN: Success on ctrl data TRB without IOC set??\n"); | |
923 | status = -ESHUTDOWN; | |
924 | } else { | |
925 | xhci_dbg(xhci, "Successful control transfer!\n"); | |
926 | status = 0; | |
927 | } | |
928 | break; | |
929 | case COMP_SHORT_TX: | |
930 | xhci_warn(xhci, "WARN: short transfer on control ep\n"); | |
931 | status = -EREMOTEIO; | |
932 | break; | |
d0e96f5a | 933 | default: |
b10de142 SS |
934 | /* Others already handled above */ |
935 | break; | |
d0e96f5a SS |
936 | } |
937 | /* | |
938 | * Did we transfer any data, despite the errors that might have | |
939 | * happened? I.e. did we get past the setup stage? | |
940 | */ | |
941 | if (event_trb != ep_ring->dequeue) { | |
942 | /* The event was for the status stage */ | |
943 | if (event_trb == td->last_trb) { | |
c92bcfa7 SS |
944 | if (td->urb->actual_length != 0) { |
945 | /* Don't overwrite a previously set error code */ | |
946 | if (status == -EINPROGRESS || status == 0) | |
947 | /* Did we already see a short data stage? */ | |
948 | status = -EREMOTEIO; | |
949 | } else { | |
62889610 SS |
950 | td->urb->actual_length = |
951 | td->urb->transfer_buffer_length; | |
c92bcfa7 | 952 | } |
d0e96f5a | 953 | } else { |
ae636747 | 954 | /* Maybe the event was for the data stage? */ |
62889610 | 955 | if (GET_COMP_CODE(event->transfer_len) != COMP_STOP_INVAL) { |
ae636747 SS |
956 | /* We didn't stop on a link TRB in the middle */ |
957 | td->urb->actual_length = | |
958 | td->urb->transfer_buffer_length - | |
959 | TRB_LEN(event->transfer_len); | |
62889610 SS |
960 | xhci_dbg(xhci, "Waiting for status stage event\n"); |
961 | urb = NULL; | |
962 | goto cleanup; | |
963 | } | |
d0e96f5a SS |
964 | } |
965 | } | |
d0e96f5a | 966 | } else { |
b10de142 SS |
967 | switch (GET_COMP_CODE(event->transfer_len)) { |
968 | case COMP_SUCCESS: | |
969 | /* Double check that the HW transferred everything. */ | |
970 | if (event_trb != td->last_trb) { | |
971 | xhci_warn(xhci, "WARN Successful completion " | |
972 | "on short TX\n"); | |
973 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) | |
974 | status = -EREMOTEIO; | |
975 | else | |
976 | status = 0; | |
977 | } else { | |
978 | xhci_dbg(xhci, "Successful bulk transfer!\n"); | |
979 | status = 0; | |
980 | } | |
981 | break; | |
982 | case COMP_SHORT_TX: | |
983 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) | |
984 | status = -EREMOTEIO; | |
985 | else | |
986 | status = 0; | |
987 | break; | |
988 | default: | |
989 | /* Others already handled above */ | |
990 | break; | |
991 | } | |
992 | dev_dbg(&td->urb->dev->dev, | |
993 | "ep %#x - asked for %d bytes, " | |
994 | "%d bytes untransferred\n", | |
995 | td->urb->ep->desc.bEndpointAddress, | |
996 | td->urb->transfer_buffer_length, | |
997 | TRB_LEN(event->transfer_len)); | |
998 | /* Fast path - was this the last TRB in the TD for this URB? */ | |
999 | if (event_trb == td->last_trb) { | |
1000 | if (TRB_LEN(event->transfer_len) != 0) { | |
1001 | td->urb->actual_length = | |
1002 | td->urb->transfer_buffer_length - | |
1003 | TRB_LEN(event->transfer_len); | |
1004 | if (td->urb->actual_length < 0) { | |
1005 | xhci_warn(xhci, "HC gave bad length " | |
1006 | "of %d bytes left\n", | |
1007 | TRB_LEN(event->transfer_len)); | |
1008 | td->urb->actual_length = 0; | |
1009 | } | |
c92bcfa7 SS |
1010 | /* Don't overwrite a previously set error code */ |
1011 | if (status == -EINPROGRESS) { | |
1012 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) | |
1013 | status = -EREMOTEIO; | |
1014 | else | |
1015 | status = 0; | |
1016 | } | |
b10de142 SS |
1017 | } else { |
1018 | td->urb->actual_length = td->urb->transfer_buffer_length; | |
1019 | /* Ignore a short packet completion if the | |
1020 | * untransferred length was zero. | |
1021 | */ | |
c92bcfa7 SS |
1022 | if (status == -EREMOTEIO) |
1023 | status = 0; | |
b10de142 SS |
1024 | } |
1025 | } else { | |
ae636747 SS |
1026 | /* Slow path - walk the list, starting from the dequeue |
1027 | * pointer, to get the actual length transferred. | |
b10de142 | 1028 | */ |
ae636747 SS |
1029 | union xhci_trb *cur_trb; |
1030 | struct xhci_segment *cur_seg; | |
1031 | ||
b10de142 | 1032 | td->urb->actual_length = 0; |
ae636747 SS |
1033 | for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg; |
1034 | cur_trb != event_trb; | |
1035 | next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { | |
1036 | if (TRB_TYPE(cur_trb->generic.field[3]) != TRB_TR_NOOP && | |
1037 | TRB_TYPE(cur_trb->generic.field[3]) != TRB_LINK) | |
1038 | td->urb->actual_length += | |
1039 | TRB_LEN(cur_trb->generic.field[2]); | |
b10de142 | 1040 | } |
ae636747 SS |
1041 | /* If the ring didn't stop on a Link or No-op TRB, add |
1042 | * in the actual bytes transferred from the Normal TRB | |
1043 | */ | |
1044 | if (GET_COMP_CODE(event->transfer_len) != COMP_STOP_INVAL) | |
1045 | td->urb->actual_length += | |
1046 | TRB_LEN(cur_trb->generic.field[2]) - | |
1047 | TRB_LEN(event->transfer_len); | |
b10de142 | 1048 | } |
d0e96f5a | 1049 | } |
ae636747 SS |
1050 | if (GET_COMP_CODE(event->transfer_len) == COMP_STOP_INVAL || |
1051 | GET_COMP_CODE(event->transfer_len) == COMP_STOP) { | |
c92bcfa7 SS |
1052 | /* The Endpoint Stop Command completion will take care of any |
1053 | * stopped TDs. A stopped TD may be restarted, so don't update | |
1054 | * the ring dequeue pointer or take this TD off any lists yet. | |
1055 | */ | |
ae636747 SS |
1056 | ep_ring->stopped_td = td; |
1057 | ep_ring->stopped_trb = event_trb; | |
1058 | } else { | |
c92bcfa7 SS |
1059 | if (GET_COMP_CODE(event->transfer_len) == COMP_STALL) { |
1060 | /* The transfer is completed from the driver's | |
1061 | * perspective, but we need to issue a set dequeue | |
1062 | * command for this stalled endpoint to move the dequeue | |
1063 | * pointer past the TD. We can't do that here because | |
1064 | * the halt condition must be cleared first. | |
1065 | */ | |
1066 | ep_ring->stopped_td = td; | |
1067 | ep_ring->stopped_trb = event_trb; | |
1068 | } else { | |
1069 | /* Update ring dequeue pointer */ | |
1070 | while (ep_ring->dequeue != td->last_trb) | |
1071 | inc_deq(xhci, ep_ring, false); | |
ae636747 | 1072 | inc_deq(xhci, ep_ring, false); |
c92bcfa7 | 1073 | } |
b10de142 | 1074 | |
ae636747 SS |
1075 | /* Clean up the endpoint's TD list */ |
1076 | urb = td->urb; | |
1077 | list_del(&td->td_list); | |
1078 | /* Was this TD slated to be cancelled but completed anyway? */ | |
1079 | if (!list_empty(&td->cancelled_td_list)) { | |
1080 | list_del(&td->cancelled_td_list); | |
1081 | ep_ring->cancels_pending--; | |
1082 | } | |
c92bcfa7 SS |
1083 | /* Leave the TD around for the reset endpoint function to use */ |
1084 | if (GET_COMP_CODE(event->transfer_len) != COMP_STALL) { | |
1085 | kfree(td); | |
1086 | } | |
ae636747 SS |
1087 | urb->hcpriv = NULL; |
1088 | } | |
d0e96f5a SS |
1089 | cleanup: |
1090 | inc_deq(xhci, xhci->event_ring, true); | |
23e3be11 | 1091 | xhci_set_hc_event_deq(xhci); |
d0e96f5a | 1092 | |
b10de142 | 1093 | /* FIXME for multi-TD URBs (who have buffers bigger than 64MB) */ |
d0e96f5a SS |
1094 | if (urb) { |
1095 | usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), urb); | |
66e49d87 SS |
1096 | xhci_dbg(xhci, "Giveback URB %p, len = %d, status = %d\n", |
1097 | urb, td->urb->actual_length, status); | |
d0e96f5a SS |
1098 | spin_unlock(&xhci->lock); |
1099 | usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, status); | |
1100 | spin_lock(&xhci->lock); | |
1101 | } | |
1102 | return 0; | |
1103 | } | |
1104 | ||
0f2a7930 SS |
1105 | /* |
1106 | * This function handles all OS-owned events on the event ring. It may drop | |
1107 | * xhci->lock between event processing (e.g. to pass up port status changes). | |
1108 | */ | |
b7258a4a | 1109 | void xhci_handle_event(struct xhci_hcd *xhci) |
7f84eef0 SS |
1110 | { |
1111 | union xhci_trb *event; | |
0f2a7930 | 1112 | int update_ptrs = 1; |
d0e96f5a | 1113 | int ret; |
7f84eef0 | 1114 | |
66e49d87 | 1115 | xhci_dbg(xhci, "In %s\n", __func__); |
7f84eef0 SS |
1116 | if (!xhci->event_ring || !xhci->event_ring->dequeue) { |
1117 | xhci->error_bitmask |= 1 << 1; | |
1118 | return; | |
1119 | } | |
1120 | ||
1121 | event = xhci->event_ring->dequeue; | |
1122 | /* Does the HC or OS own the TRB? */ | |
1123 | if ((event->event_cmd.flags & TRB_CYCLE) != | |
1124 | xhci->event_ring->cycle_state) { | |
1125 | xhci->error_bitmask |= 1 << 2; | |
1126 | return; | |
1127 | } | |
66e49d87 | 1128 | xhci_dbg(xhci, "%s - OS owns TRB\n", __func__); |
7f84eef0 | 1129 | |
0f2a7930 | 1130 | /* FIXME: Handle more event types. */ |
7f84eef0 SS |
1131 | switch ((event->event_cmd.flags & TRB_TYPE_BITMASK)) { |
1132 | case TRB_TYPE(TRB_COMPLETION): | |
66e49d87 | 1133 | xhci_dbg(xhci, "%s - calling handle_cmd_completion\n", __func__); |
7f84eef0 | 1134 | handle_cmd_completion(xhci, &event->event_cmd); |
66e49d87 | 1135 | xhci_dbg(xhci, "%s - returned from handle_cmd_completion\n", __func__); |
7f84eef0 | 1136 | break; |
0f2a7930 | 1137 | case TRB_TYPE(TRB_PORT_STATUS): |
66e49d87 | 1138 | xhci_dbg(xhci, "%s - calling handle_port_status\n", __func__); |
0f2a7930 | 1139 | handle_port_status(xhci, event); |
66e49d87 | 1140 | xhci_dbg(xhci, "%s - returned from handle_port_status\n", __func__); |
0f2a7930 SS |
1141 | update_ptrs = 0; |
1142 | break; | |
d0e96f5a | 1143 | case TRB_TYPE(TRB_TRANSFER): |
66e49d87 | 1144 | xhci_dbg(xhci, "%s - calling handle_tx_event\n", __func__); |
d0e96f5a | 1145 | ret = handle_tx_event(xhci, &event->trans_event); |
66e49d87 | 1146 | xhci_dbg(xhci, "%s - returned from handle_tx_event\n", __func__); |
d0e96f5a SS |
1147 | if (ret < 0) |
1148 | xhci->error_bitmask |= 1 << 9; | |
1149 | else | |
1150 | update_ptrs = 0; | |
1151 | break; | |
7f84eef0 SS |
1152 | default: |
1153 | xhci->error_bitmask |= 1 << 3; | |
1154 | } | |
1155 | ||
0f2a7930 SS |
1156 | if (update_ptrs) { |
1157 | /* Update SW and HC event ring dequeue pointer */ | |
1158 | inc_deq(xhci, xhci->event_ring, true); | |
23e3be11 | 1159 | xhci_set_hc_event_deq(xhci); |
0f2a7930 | 1160 | } |
7f84eef0 | 1161 | /* Are there more items on the event ring? */ |
b7258a4a | 1162 | xhci_handle_event(xhci); |
7f84eef0 SS |
1163 | } |
1164 | ||
d0e96f5a SS |
1165 | /**** Endpoint Ring Operations ****/ |
1166 | ||
7f84eef0 SS |
1167 | /* |
1168 | * Generic function for queueing a TRB on a ring. | |
1169 | * The caller must have checked to make sure there's room on the ring. | |
1170 | */ | |
1171 | static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
1172 | bool consumer, | |
1173 | u32 field1, u32 field2, u32 field3, u32 field4) | |
1174 | { | |
1175 | struct xhci_generic_trb *trb; | |
1176 | ||
1177 | trb = &ring->enqueue->generic; | |
1178 | trb->field[0] = field1; | |
1179 | trb->field[1] = field2; | |
1180 | trb->field[2] = field3; | |
1181 | trb->field[3] = field4; | |
1182 | inc_enq(xhci, ring, consumer); | |
1183 | } | |
1184 | ||
d0e96f5a SS |
1185 | /* |
1186 | * Does various checks on the endpoint ring, and makes it ready to queue num_trbs. | |
1187 | * FIXME allocate segments if the ring is full. | |
1188 | */ | |
1189 | static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, | |
1190 | u32 ep_state, unsigned int num_trbs, gfp_t mem_flags) | |
1191 | { | |
1192 | /* Make sure the endpoint has been added to xHC schedule */ | |
1193 | xhci_dbg(xhci, "Endpoint state = 0x%x\n", ep_state); | |
1194 | switch (ep_state) { | |
1195 | case EP_STATE_DISABLED: | |
1196 | /* | |
1197 | * USB core changed config/interfaces without notifying us, | |
1198 | * or hardware is reporting the wrong state. | |
1199 | */ | |
1200 | xhci_warn(xhci, "WARN urb submitted to disabled ep\n"); | |
1201 | return -ENOENT; | |
d0e96f5a | 1202 | case EP_STATE_ERROR: |
c92bcfa7 | 1203 | xhci_warn(xhci, "WARN waiting for error on ep to be cleared\n"); |
d0e96f5a SS |
1204 | /* FIXME event handling code for error needs to clear it */ |
1205 | /* XXX not sure if this should be -ENOENT or not */ | |
1206 | return -EINVAL; | |
c92bcfa7 SS |
1207 | case EP_STATE_HALTED: |
1208 | xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n"); | |
d0e96f5a SS |
1209 | case EP_STATE_STOPPED: |
1210 | case EP_STATE_RUNNING: | |
1211 | break; | |
1212 | default: | |
1213 | xhci_err(xhci, "ERROR unknown endpoint state for ep\n"); | |
1214 | /* | |
1215 | * FIXME issue Configure Endpoint command to try to get the HC | |
1216 | * back into a known state. | |
1217 | */ | |
1218 | return -EINVAL; | |
1219 | } | |
1220 | if (!room_on_ring(xhci, ep_ring, num_trbs)) { | |
1221 | /* FIXME allocate more room */ | |
1222 | xhci_err(xhci, "ERROR no room on ep ring\n"); | |
1223 | return -ENOMEM; | |
1224 | } | |
1225 | return 0; | |
1226 | } | |
1227 | ||
23e3be11 | 1228 | static int prepare_transfer(struct xhci_hcd *xhci, |
d0e96f5a SS |
1229 | struct xhci_virt_device *xdev, |
1230 | unsigned int ep_index, | |
1231 | unsigned int num_trbs, | |
1232 | struct urb *urb, | |
1233 | struct xhci_td **td, | |
1234 | gfp_t mem_flags) | |
1235 | { | |
1236 | int ret; | |
d115b048 | 1237 | struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
d0e96f5a | 1238 | ret = prepare_ring(xhci, xdev->ep_rings[ep_index], |
d115b048 | 1239 | ep_ctx->ep_info & EP_STATE_MASK, |
d0e96f5a SS |
1240 | num_trbs, mem_flags); |
1241 | if (ret) | |
1242 | return ret; | |
1243 | *td = kzalloc(sizeof(struct xhci_td), mem_flags); | |
1244 | if (!*td) | |
1245 | return -ENOMEM; | |
1246 | INIT_LIST_HEAD(&(*td)->td_list); | |
ae636747 | 1247 | INIT_LIST_HEAD(&(*td)->cancelled_td_list); |
d0e96f5a SS |
1248 | |
1249 | ret = usb_hcd_link_urb_to_ep(xhci_to_hcd(xhci), urb); | |
1250 | if (unlikely(ret)) { | |
1251 | kfree(*td); | |
1252 | return ret; | |
1253 | } | |
1254 | ||
1255 | (*td)->urb = urb; | |
1256 | urb->hcpriv = (void *) (*td); | |
1257 | /* Add this TD to the tail of the endpoint ring's TD list */ | |
1258 | list_add_tail(&(*td)->td_list, &xdev->ep_rings[ep_index]->td_list); | |
ae636747 SS |
1259 | (*td)->start_seg = xdev->ep_rings[ep_index]->enq_seg; |
1260 | (*td)->first_trb = xdev->ep_rings[ep_index]->enqueue; | |
d0e96f5a SS |
1261 | |
1262 | return 0; | |
1263 | } | |
1264 | ||
23e3be11 | 1265 | static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb) |
8a96c052 SS |
1266 | { |
1267 | int num_sgs, num_trbs, running_total, temp, i; | |
1268 | struct scatterlist *sg; | |
1269 | ||
1270 | sg = NULL; | |
1271 | num_sgs = urb->num_sgs; | |
1272 | temp = urb->transfer_buffer_length; | |
1273 | ||
1274 | xhci_dbg(xhci, "count sg list trbs: \n"); | |
1275 | num_trbs = 0; | |
1276 | for_each_sg(urb->sg->sg, sg, num_sgs, i) { | |
1277 | unsigned int previous_total_trbs = num_trbs; | |
1278 | unsigned int len = sg_dma_len(sg); | |
1279 | ||
1280 | /* Scatter gather list entries may cross 64KB boundaries */ | |
1281 | running_total = TRB_MAX_BUFF_SIZE - | |
1282 | (sg_dma_address(sg) & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1283 | if (running_total != 0) | |
1284 | num_trbs++; | |
1285 | ||
1286 | /* How many more 64KB chunks to transfer, how many more TRBs? */ | |
1287 | while (running_total < sg_dma_len(sg)) { | |
1288 | num_trbs++; | |
1289 | running_total += TRB_MAX_BUFF_SIZE; | |
1290 | } | |
700e2052 GKH |
1291 | xhci_dbg(xhci, " sg #%d: dma = %#llx, len = %#x (%d), num_trbs = %d\n", |
1292 | i, (unsigned long long)sg_dma_address(sg), | |
1293 | len, len, num_trbs - previous_total_trbs); | |
8a96c052 SS |
1294 | |
1295 | len = min_t(int, len, temp); | |
1296 | temp -= len; | |
1297 | if (temp == 0) | |
1298 | break; | |
1299 | } | |
1300 | xhci_dbg(xhci, "\n"); | |
1301 | if (!in_interrupt()) | |
1302 | dev_dbg(&urb->dev->dev, "ep %#x - urb len = %d, sglist used, num_trbs = %d\n", | |
1303 | urb->ep->desc.bEndpointAddress, | |
1304 | urb->transfer_buffer_length, | |
1305 | num_trbs); | |
1306 | return num_trbs; | |
1307 | } | |
1308 | ||
23e3be11 | 1309 | static void check_trb_math(struct urb *urb, int num_trbs, int running_total) |
8a96c052 SS |
1310 | { |
1311 | if (num_trbs != 0) | |
1312 | dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated number of " | |
1313 | "TRBs, %d left\n", __func__, | |
1314 | urb->ep->desc.bEndpointAddress, num_trbs); | |
1315 | if (running_total != urb->transfer_buffer_length) | |
1316 | dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, " | |
1317 | "queued %#x (%d), asked for %#x (%d)\n", | |
1318 | __func__, | |
1319 | urb->ep->desc.bEndpointAddress, | |
1320 | running_total, running_total, | |
1321 | urb->transfer_buffer_length, | |
1322 | urb->transfer_buffer_length); | |
1323 | } | |
1324 | ||
23e3be11 | 1325 | static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id, |
8a96c052 SS |
1326 | unsigned int ep_index, int start_cycle, |
1327 | struct xhci_generic_trb *start_trb, struct xhci_td *td) | |
1328 | { | |
8a96c052 SS |
1329 | /* |
1330 | * Pass all the TRBs to the hardware at once and make sure this write | |
1331 | * isn't reordered. | |
1332 | */ | |
1333 | wmb(); | |
1334 | start_trb->field[3] |= start_cycle; | |
ae636747 | 1335 | ring_ep_doorbell(xhci, slot_id, ep_index); |
8a96c052 SS |
1336 | } |
1337 | ||
23e3be11 | 1338 | static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
8a96c052 SS |
1339 | struct urb *urb, int slot_id, unsigned int ep_index) |
1340 | { | |
1341 | struct xhci_ring *ep_ring; | |
1342 | unsigned int num_trbs; | |
1343 | struct xhci_td *td; | |
1344 | struct scatterlist *sg; | |
1345 | int num_sgs; | |
1346 | int trb_buff_len, this_sg_len, running_total; | |
1347 | bool first_trb; | |
1348 | u64 addr; | |
1349 | ||
1350 | struct xhci_generic_trb *start_trb; | |
1351 | int start_cycle; | |
1352 | ||
1353 | ep_ring = xhci->devs[slot_id]->ep_rings[ep_index]; | |
1354 | num_trbs = count_sg_trbs_needed(xhci, urb); | |
1355 | num_sgs = urb->num_sgs; | |
1356 | ||
23e3be11 | 1357 | trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id], |
8a96c052 SS |
1358 | ep_index, num_trbs, urb, &td, mem_flags); |
1359 | if (trb_buff_len < 0) | |
1360 | return trb_buff_len; | |
1361 | /* | |
1362 | * Don't give the first TRB to the hardware (by toggling the cycle bit) | |
1363 | * until we've finished creating all the other TRBs. The ring's cycle | |
1364 | * state may change as we enqueue the other TRBs, so save it too. | |
1365 | */ | |
1366 | start_trb = &ep_ring->enqueue->generic; | |
1367 | start_cycle = ep_ring->cycle_state; | |
1368 | ||
1369 | running_total = 0; | |
1370 | /* | |
1371 | * How much data is in the first TRB? | |
1372 | * | |
1373 | * There are three forces at work for TRB buffer pointers and lengths: | |
1374 | * 1. We don't want to walk off the end of this sg-list entry buffer. | |
1375 | * 2. The transfer length that the driver requested may be smaller than | |
1376 | * the amount of memory allocated for this scatter-gather list. | |
1377 | * 3. TRBs buffers can't cross 64KB boundaries. | |
1378 | */ | |
1379 | sg = urb->sg->sg; | |
1380 | addr = (u64) sg_dma_address(sg); | |
1381 | this_sg_len = sg_dma_len(sg); | |
1382 | trb_buff_len = TRB_MAX_BUFF_SIZE - | |
1383 | (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1384 | trb_buff_len = min_t(int, trb_buff_len, this_sg_len); | |
1385 | if (trb_buff_len > urb->transfer_buffer_length) | |
1386 | trb_buff_len = urb->transfer_buffer_length; | |
1387 | xhci_dbg(xhci, "First length to xfer from 1st sglist entry = %u\n", | |
1388 | trb_buff_len); | |
1389 | ||
1390 | first_trb = true; | |
1391 | /* Queue the first TRB, even if it's zero-length */ | |
1392 | do { | |
1393 | u32 field = 0; | |
f9dc68fe | 1394 | u32 length_field = 0; |
8a96c052 SS |
1395 | |
1396 | /* Don't change the cycle bit of the first TRB until later */ | |
1397 | if (first_trb) | |
1398 | first_trb = false; | |
1399 | else | |
1400 | field |= ep_ring->cycle_state; | |
1401 | ||
1402 | /* Chain all the TRBs together; clear the chain bit in the last | |
1403 | * TRB to indicate it's the last TRB in the chain. | |
1404 | */ | |
1405 | if (num_trbs > 1) { | |
1406 | field |= TRB_CHAIN; | |
1407 | } else { | |
1408 | /* FIXME - add check for ZERO_PACKET flag before this */ | |
1409 | td->last_trb = ep_ring->enqueue; | |
1410 | field |= TRB_IOC; | |
1411 | } | |
1412 | xhci_dbg(xhci, " sg entry: dma = %#x, len = %#x (%d), " | |
1413 | "64KB boundary at %#x, end dma = %#x\n", | |
1414 | (unsigned int) addr, trb_buff_len, trb_buff_len, | |
1415 | (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1), | |
1416 | (unsigned int) addr + trb_buff_len); | |
1417 | if (TRB_MAX_BUFF_SIZE - | |
1418 | (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)) < trb_buff_len) { | |
1419 | xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n"); | |
1420 | xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n", | |
1421 | (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1), | |
1422 | (unsigned int) addr + trb_buff_len); | |
1423 | } | |
f9dc68fe SS |
1424 | length_field = TRB_LEN(trb_buff_len) | |
1425 | TD_REMAINDER(urb->transfer_buffer_length - running_total) | | |
1426 | TRB_INTR_TARGET(0); | |
8a96c052 | 1427 | queue_trb(xhci, ep_ring, false, |
8e595a5d SS |
1428 | lower_32_bits(addr), |
1429 | upper_32_bits(addr), | |
f9dc68fe | 1430 | length_field, |
8a96c052 SS |
1431 | /* We always want to know if the TRB was short, |
1432 | * or we won't get an event when it completes. | |
1433 | * (Unless we use event data TRBs, which are a | |
1434 | * waste of space and HC resources.) | |
1435 | */ | |
1436 | field | TRB_ISP | TRB_TYPE(TRB_NORMAL)); | |
1437 | --num_trbs; | |
1438 | running_total += trb_buff_len; | |
1439 | ||
1440 | /* Calculate length for next transfer -- | |
1441 | * Are we done queueing all the TRBs for this sg entry? | |
1442 | */ | |
1443 | this_sg_len -= trb_buff_len; | |
1444 | if (this_sg_len == 0) { | |
1445 | --num_sgs; | |
1446 | if (num_sgs == 0) | |
1447 | break; | |
1448 | sg = sg_next(sg); | |
1449 | addr = (u64) sg_dma_address(sg); | |
1450 | this_sg_len = sg_dma_len(sg); | |
1451 | } else { | |
1452 | addr += trb_buff_len; | |
1453 | } | |
1454 | ||
1455 | trb_buff_len = TRB_MAX_BUFF_SIZE - | |
1456 | (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1457 | trb_buff_len = min_t(int, trb_buff_len, this_sg_len); | |
1458 | if (running_total + trb_buff_len > urb->transfer_buffer_length) | |
1459 | trb_buff_len = | |
1460 | urb->transfer_buffer_length - running_total; | |
1461 | } while (running_total < urb->transfer_buffer_length); | |
1462 | ||
1463 | check_trb_math(urb, num_trbs, running_total); | |
1464 | giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td); | |
1465 | return 0; | |
1466 | } | |
1467 | ||
b10de142 | 1468 | /* This is very similar to what ehci-q.c qtd_fill() does */ |
23e3be11 | 1469 | int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
b10de142 SS |
1470 | struct urb *urb, int slot_id, unsigned int ep_index) |
1471 | { | |
1472 | struct xhci_ring *ep_ring; | |
1473 | struct xhci_td *td; | |
1474 | int num_trbs; | |
1475 | struct xhci_generic_trb *start_trb; | |
1476 | bool first_trb; | |
1477 | int start_cycle; | |
f9dc68fe | 1478 | u32 field, length_field; |
b10de142 SS |
1479 | |
1480 | int running_total, trb_buff_len, ret; | |
1481 | u64 addr; | |
1482 | ||
8a96c052 SS |
1483 | if (urb->sg) |
1484 | return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id, ep_index); | |
1485 | ||
b10de142 SS |
1486 | ep_ring = xhci->devs[slot_id]->ep_rings[ep_index]; |
1487 | ||
1488 | num_trbs = 0; | |
1489 | /* How much data is (potentially) left before the 64KB boundary? */ | |
1490 | running_total = TRB_MAX_BUFF_SIZE - | |
1491 | (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1492 | ||
1493 | /* If there's some data on this 64KB chunk, or we have to send a | |
1494 | * zero-length transfer, we need at least one TRB | |
1495 | */ | |
1496 | if (running_total != 0 || urb->transfer_buffer_length == 0) | |
1497 | num_trbs++; | |
1498 | /* How many more 64KB chunks to transfer, how many more TRBs? */ | |
1499 | while (running_total < urb->transfer_buffer_length) { | |
1500 | num_trbs++; | |
1501 | running_total += TRB_MAX_BUFF_SIZE; | |
1502 | } | |
1503 | /* FIXME: this doesn't deal with URB_ZERO_PACKET - need one more */ | |
1504 | ||
1505 | if (!in_interrupt()) | |
700e2052 | 1506 | dev_dbg(&urb->dev->dev, "ep %#x - urb len = %#x (%d), addr = %#llx, num_trbs = %d\n", |
b10de142 | 1507 | urb->ep->desc.bEndpointAddress, |
8a96c052 SS |
1508 | urb->transfer_buffer_length, |
1509 | urb->transfer_buffer_length, | |
700e2052 | 1510 | (unsigned long long)urb->transfer_dma, |
b10de142 | 1511 | num_trbs); |
8a96c052 | 1512 | |
23e3be11 | 1513 | ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, |
b10de142 SS |
1514 | num_trbs, urb, &td, mem_flags); |
1515 | if (ret < 0) | |
1516 | return ret; | |
1517 | ||
1518 | /* | |
1519 | * Don't give the first TRB to the hardware (by toggling the cycle bit) | |
1520 | * until we've finished creating all the other TRBs. The ring's cycle | |
1521 | * state may change as we enqueue the other TRBs, so save it too. | |
1522 | */ | |
1523 | start_trb = &ep_ring->enqueue->generic; | |
1524 | start_cycle = ep_ring->cycle_state; | |
1525 | ||
1526 | running_total = 0; | |
1527 | /* How much data is in the first TRB? */ | |
1528 | addr = (u64) urb->transfer_dma; | |
1529 | trb_buff_len = TRB_MAX_BUFF_SIZE - | |
1530 | (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1531 | if (urb->transfer_buffer_length < trb_buff_len) | |
1532 | trb_buff_len = urb->transfer_buffer_length; | |
1533 | ||
1534 | first_trb = true; | |
1535 | ||
1536 | /* Queue the first TRB, even if it's zero-length */ | |
1537 | do { | |
1538 | field = 0; | |
1539 | ||
1540 | /* Don't change the cycle bit of the first TRB until later */ | |
1541 | if (first_trb) | |
1542 | first_trb = false; | |
1543 | else | |
1544 | field |= ep_ring->cycle_state; | |
1545 | ||
1546 | /* Chain all the TRBs together; clear the chain bit in the last | |
1547 | * TRB to indicate it's the last TRB in the chain. | |
1548 | */ | |
1549 | if (num_trbs > 1) { | |
1550 | field |= TRB_CHAIN; | |
1551 | } else { | |
1552 | /* FIXME - add check for ZERO_PACKET flag before this */ | |
1553 | td->last_trb = ep_ring->enqueue; | |
1554 | field |= TRB_IOC; | |
1555 | } | |
f9dc68fe SS |
1556 | length_field = TRB_LEN(trb_buff_len) | |
1557 | TD_REMAINDER(urb->transfer_buffer_length - running_total) | | |
1558 | TRB_INTR_TARGET(0); | |
b10de142 | 1559 | queue_trb(xhci, ep_ring, false, |
8e595a5d SS |
1560 | lower_32_bits(addr), |
1561 | upper_32_bits(addr), | |
f9dc68fe | 1562 | length_field, |
b10de142 SS |
1563 | /* We always want to know if the TRB was short, |
1564 | * or we won't get an event when it completes. | |
1565 | * (Unless we use event data TRBs, which are a | |
1566 | * waste of space and HC resources.) | |
1567 | */ | |
1568 | field | TRB_ISP | TRB_TYPE(TRB_NORMAL)); | |
1569 | --num_trbs; | |
1570 | running_total += trb_buff_len; | |
1571 | ||
1572 | /* Calculate length for next transfer */ | |
1573 | addr += trb_buff_len; | |
1574 | trb_buff_len = urb->transfer_buffer_length - running_total; | |
1575 | if (trb_buff_len > TRB_MAX_BUFF_SIZE) | |
1576 | trb_buff_len = TRB_MAX_BUFF_SIZE; | |
1577 | } while (running_total < urb->transfer_buffer_length); | |
1578 | ||
8a96c052 SS |
1579 | check_trb_math(urb, num_trbs, running_total); |
1580 | giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td); | |
b10de142 SS |
1581 | return 0; |
1582 | } | |
1583 | ||
d0e96f5a | 1584 | /* Caller must have locked xhci->lock */ |
23e3be11 | 1585 | int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
d0e96f5a SS |
1586 | struct urb *urb, int slot_id, unsigned int ep_index) |
1587 | { | |
1588 | struct xhci_ring *ep_ring; | |
1589 | int num_trbs; | |
1590 | int ret; | |
1591 | struct usb_ctrlrequest *setup; | |
1592 | struct xhci_generic_trb *start_trb; | |
1593 | int start_cycle; | |
f9dc68fe | 1594 | u32 field, length_field; |
d0e96f5a SS |
1595 | struct xhci_td *td; |
1596 | ||
1597 | ep_ring = xhci->devs[slot_id]->ep_rings[ep_index]; | |
1598 | ||
1599 | /* | |
1600 | * Need to copy setup packet into setup TRB, so we can't use the setup | |
1601 | * DMA address. | |
1602 | */ | |
1603 | if (!urb->setup_packet) | |
1604 | return -EINVAL; | |
1605 | ||
1606 | if (!in_interrupt()) | |
1607 | xhci_dbg(xhci, "Queueing ctrl tx for slot id %d, ep %d\n", | |
1608 | slot_id, ep_index); | |
1609 | /* 1 TRB for setup, 1 for status */ | |
1610 | num_trbs = 2; | |
1611 | /* | |
1612 | * Don't need to check if we need additional event data and normal TRBs, | |
1613 | * since data in control transfers will never get bigger than 16MB | |
1614 | * XXX: can we get a buffer that crosses 64KB boundaries? | |
1615 | */ | |
1616 | if (urb->transfer_buffer_length > 0) | |
1617 | num_trbs++; | |
23e3be11 | 1618 | ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, num_trbs, |
d0e96f5a SS |
1619 | urb, &td, mem_flags); |
1620 | if (ret < 0) | |
1621 | return ret; | |
1622 | ||
1623 | /* | |
1624 | * Don't give the first TRB to the hardware (by toggling the cycle bit) | |
1625 | * until we've finished creating all the other TRBs. The ring's cycle | |
1626 | * state may change as we enqueue the other TRBs, so save it too. | |
1627 | */ | |
1628 | start_trb = &ep_ring->enqueue->generic; | |
1629 | start_cycle = ep_ring->cycle_state; | |
1630 | ||
1631 | /* Queue setup TRB - see section 6.4.1.2.1 */ | |
1632 | /* FIXME better way to translate setup_packet into two u32 fields? */ | |
1633 | setup = (struct usb_ctrlrequest *) urb->setup_packet; | |
1634 | queue_trb(xhci, ep_ring, false, | |
1635 | /* FIXME endianness is probably going to bite my ass here. */ | |
1636 | setup->bRequestType | setup->bRequest << 8 | setup->wValue << 16, | |
1637 | setup->wIndex | setup->wLength << 16, | |
1638 | TRB_LEN(8) | TRB_INTR_TARGET(0), | |
1639 | /* Immediate data in pointer */ | |
1640 | TRB_IDT | TRB_TYPE(TRB_SETUP)); | |
1641 | ||
1642 | /* If there's data, queue data TRBs */ | |
1643 | field = 0; | |
f9dc68fe SS |
1644 | length_field = TRB_LEN(urb->transfer_buffer_length) | |
1645 | TD_REMAINDER(urb->transfer_buffer_length) | | |
1646 | TRB_INTR_TARGET(0); | |
d0e96f5a SS |
1647 | if (urb->transfer_buffer_length > 0) { |
1648 | if (setup->bRequestType & USB_DIR_IN) | |
1649 | field |= TRB_DIR_IN; | |
1650 | queue_trb(xhci, ep_ring, false, | |
1651 | lower_32_bits(urb->transfer_dma), | |
1652 | upper_32_bits(urb->transfer_dma), | |
f9dc68fe | 1653 | length_field, |
d0e96f5a SS |
1654 | /* Event on short tx */ |
1655 | field | TRB_ISP | TRB_TYPE(TRB_DATA) | ep_ring->cycle_state); | |
1656 | } | |
1657 | ||
1658 | /* Save the DMA address of the last TRB in the TD */ | |
1659 | td->last_trb = ep_ring->enqueue; | |
1660 | ||
1661 | /* Queue status TRB - see Table 7 and sections 4.11.2.2 and 6.4.1.2.3 */ | |
1662 | /* If the device sent data, the status stage is an OUT transfer */ | |
1663 | if (urb->transfer_buffer_length > 0 && setup->bRequestType & USB_DIR_IN) | |
1664 | field = 0; | |
1665 | else | |
1666 | field = TRB_DIR_IN; | |
1667 | queue_trb(xhci, ep_ring, false, | |
1668 | 0, | |
1669 | 0, | |
1670 | TRB_INTR_TARGET(0), | |
1671 | /* Event on completion */ | |
1672 | field | TRB_IOC | TRB_TYPE(TRB_STATUS) | ep_ring->cycle_state); | |
1673 | ||
8a96c052 | 1674 | giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td); |
d0e96f5a SS |
1675 | return 0; |
1676 | } | |
1677 | ||
1678 | /**** Command Ring Operations ****/ | |
1679 | ||
7f84eef0 SS |
1680 | /* Generic function for queueing a command TRB on the command ring */ |
1681 | static int queue_command(struct xhci_hcd *xhci, u32 field1, u32 field2, u32 field3, u32 field4) | |
1682 | { | |
1683 | if (!room_on_ring(xhci, xhci->cmd_ring, 1)) { | |
1684 | if (!in_interrupt()) | |
1685 | xhci_err(xhci, "ERR: No room for command on command ring\n"); | |
1686 | return -ENOMEM; | |
1687 | } | |
1688 | queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3, | |
1689 | field4 | xhci->cmd_ring->cycle_state); | |
1690 | return 0; | |
1691 | } | |
1692 | ||
1693 | /* Queue a no-op command on the command ring */ | |
1694 | static int queue_cmd_noop(struct xhci_hcd *xhci) | |
1695 | { | |
1696 | return queue_command(xhci, 0, 0, 0, TRB_TYPE(TRB_CMD_NOOP)); | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * Place a no-op command on the command ring to test the command and | |
1701 | * event ring. | |
1702 | */ | |
23e3be11 | 1703 | void *xhci_setup_one_noop(struct xhci_hcd *xhci) |
7f84eef0 SS |
1704 | { |
1705 | if (queue_cmd_noop(xhci) < 0) | |
1706 | return NULL; | |
1707 | xhci->noops_submitted++; | |
23e3be11 | 1708 | return xhci_ring_cmd_db; |
7f84eef0 | 1709 | } |
3ffbba95 SS |
1710 | |
1711 | /* Queue a slot enable or disable request on the command ring */ | |
23e3be11 | 1712 | int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id) |
3ffbba95 SS |
1713 | { |
1714 | return queue_command(xhci, 0, 0, 0, | |
1715 | TRB_TYPE(trb_type) | SLOT_ID_FOR_TRB(slot_id)); | |
1716 | } | |
1717 | ||
1718 | /* Queue an address device command TRB */ | |
23e3be11 SS |
1719 | int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, |
1720 | u32 slot_id) | |
3ffbba95 | 1721 | { |
8e595a5d SS |
1722 | return queue_command(xhci, lower_32_bits(in_ctx_ptr), |
1723 | upper_32_bits(in_ctx_ptr), 0, | |
3ffbba95 SS |
1724 | TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id)); |
1725 | } | |
f94e0186 SS |
1726 | |
1727 | /* Queue a configure endpoint command TRB */ | |
23e3be11 SS |
1728 | int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, |
1729 | u32 slot_id) | |
f94e0186 | 1730 | { |
8e595a5d SS |
1731 | return queue_command(xhci, lower_32_bits(in_ctx_ptr), |
1732 | upper_32_bits(in_ctx_ptr), 0, | |
f94e0186 SS |
1733 | TRB_TYPE(TRB_CONFIG_EP) | SLOT_ID_FOR_TRB(slot_id)); |
1734 | } | |
ae636747 | 1735 | |
23e3be11 | 1736 | int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id, |
ae636747 SS |
1737 | unsigned int ep_index) |
1738 | { | |
1739 | u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); | |
1740 | u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); | |
1741 | u32 type = TRB_TYPE(TRB_STOP_RING); | |
1742 | ||
1743 | return queue_command(xhci, 0, 0, 0, | |
1744 | trb_slot_id | trb_ep_index | type); | |
1745 | } | |
1746 | ||
1747 | /* Set Transfer Ring Dequeue Pointer command. | |
1748 | * This should not be used for endpoints that have streams enabled. | |
1749 | */ | |
1750 | static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id, | |
1751 | unsigned int ep_index, struct xhci_segment *deq_seg, | |
1752 | union xhci_trb *deq_ptr, u32 cycle_state) | |
1753 | { | |
1754 | dma_addr_t addr; | |
1755 | u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); | |
1756 | u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); | |
1757 | u32 type = TRB_TYPE(TRB_SET_DEQ); | |
1758 | ||
23e3be11 | 1759 | addr = xhci_trb_virt_to_dma(deq_seg, deq_ptr); |
c92bcfa7 | 1760 | if (addr == 0) { |
ae636747 | 1761 | xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n"); |
700e2052 GKH |
1762 | xhci_warn(xhci, "WARN deq seg = %p, deq pt = %p\n", |
1763 | deq_seg, deq_ptr); | |
c92bcfa7 SS |
1764 | return 0; |
1765 | } | |
8e595a5d SS |
1766 | return queue_command(xhci, lower_32_bits(addr) | cycle_state, |
1767 | upper_32_bits(addr), 0, | |
ae636747 SS |
1768 | trb_slot_id | trb_ep_index | type); |
1769 | } | |
a1587d97 SS |
1770 | |
1771 | int xhci_queue_reset_ep(struct xhci_hcd *xhci, int slot_id, | |
1772 | unsigned int ep_index) | |
1773 | { | |
1774 | u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); | |
1775 | u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); | |
1776 | u32 type = TRB_TYPE(TRB_RESET_EP); | |
1777 | ||
1778 | return queue_command(xhci, 0, 0, 0, trb_slot_id | trb_ep_index | type); | |
1779 | } |