1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget
4 *
5 * epn.c - Generic endpoints management
6 *
7 * Copyright 2017 IBM Corporation
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 as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/delay.h>
19 #include <linux/ioport.h>
20 #include <linux/slab.h>
21 #include <linux/errno.h>
22 #include <linux/list.h>
23 #include <linux/interrupt.h>
24 #include <linux/proc_fs.h>
25 #include <linux/prefetch.h>
26 #include <linux/clk.h>
27 #include <linux/usb/gadget.h>
28 #include <linux/of.h>
29 #include <linux/of_gpio.h>
30 #include <linux/regmap.h>
31 #include <linux/dma-mapping.h>
32
33 #include "vhub.h"
34
35 #define EXTRA_CHECKS
36
37 #ifdef EXTRA_CHECKS
38 #define CHECK(ep, expr, fmt...) \
39 do { \
40 if (!(expr)) EPDBG(ep, "CHECK:" fmt); \
41 } while(0)
42 #else
43 #define CHECK(ep, expr, fmt...) do { } while(0)
44 #endif
45
ast_vhub_epn_kick(struct ast_vhub_ep * ep,struct ast_vhub_req * req)46 static void ast_vhub_epn_kick(struct ast_vhub_ep *ep, struct ast_vhub_req *req)
47 {
48 unsigned int act = req->req.actual;
49 unsigned int len = req->req.length;
50 unsigned int chunk;
51
52 /* There should be no DMA ongoing */
53 WARN_ON(req->active);
54
55 /* Calculate next chunk size */
56 chunk = len - act;
57 if (chunk > ep->ep.maxpacket)
58 chunk = ep->ep.maxpacket;
59 else if ((chunk < ep->ep.maxpacket) || !req->req.zero)
60 req->last_desc = 1;
61
62 EPVDBG(ep, "kick req %p act=%d/%d chunk=%d last=%d\n",
63 req, act, len, chunk, req->last_desc);
64
65 /* If DMA unavailable, using staging EP buffer */
66 if (!req->req.dma) {
67
68 /* For IN transfers, copy data over first */
69 if (ep->epn.is_in) {
70 memcpy(ep->buf, req->req.buf + act, chunk);
71 vhub_dma_workaround(ep->buf);
72 }
73 writel(ep->buf_dma, ep->epn.regs + AST_VHUB_EP_DESC_BASE);
74 } else {
75 if (ep->epn.is_in)
76 vhub_dma_workaround(req->req.buf);
77 writel(req->req.dma + act, ep->epn.regs + AST_VHUB_EP_DESC_BASE);
78 }
79
80 /* Start DMA */
81 req->active = true;
82 writel(VHUB_EP_DMA_SET_TX_SIZE(chunk),
83 ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
84 writel(VHUB_EP_DMA_SET_TX_SIZE(chunk) | VHUB_EP_DMA_SINGLE_KICK,
85 ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
86 }
87
ast_vhub_epn_handle_ack(struct ast_vhub_ep * ep)88 static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep)
89 {
90 struct ast_vhub_req *req;
91 unsigned int len;
92 u32 stat;
93
94 /* Read EP status */
95 stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
96
97 /* Grab current request if any */
98 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
99
100 EPVDBG(ep, "ACK status=%08x is_in=%d, req=%p (active=%d)\n",
101 stat, ep->epn.is_in, req, req ? req->active : 0);
102
103 /* In absence of a request, bail out, must have been dequeued */
104 if (!req)
105 return;
106
107 /*
108 * Request not active, move on to processing queue, active request
109 * was probably dequeued
110 */
111 if (!req->active)
112 goto next_chunk;
113
114 /* Check if HW has moved on */
115 if (VHUB_EP_DMA_RPTR(stat) != 0) {
116 EPDBG(ep, "DMA read pointer not 0 !\n");
117 return;
118 }
119
120 /* No current DMA ongoing */
121 req->active = false;
122
123 /* Grab length out of HW */
124 len = VHUB_EP_DMA_TX_SIZE(stat);
125
126 /* If not using DMA, copy data out if needed */
127 if (!req->req.dma && !ep->epn.is_in && len)
128 memcpy(req->req.buf + req->req.actual, ep->buf, len);
129
130 /* Adjust size */
131 req->req.actual += len;
132
133 /* Check for short packet */
134 if (len < ep->ep.maxpacket)
135 req->last_desc = 1;
136
137 /* That's it ? complete the request and pick a new one */
138 if (req->last_desc >= 0) {
139 ast_vhub_done(ep, req, 0);
140 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req,
141 queue);
142
143 /*
144 * Due to lock dropping inside "done" the next request could
145 * already be active, so check for that and bail if needed.
146 */
147 if (!req || req->active)
148 return;
149 }
150
151 next_chunk:
152 ast_vhub_epn_kick(ep, req);
153 }
154
ast_vhub_count_free_descs(struct ast_vhub_ep * ep)155 static inline unsigned int ast_vhub_count_free_descs(struct ast_vhub_ep *ep)
156 {
157 /*
158 * d_next == d_last means descriptor list empty to HW,
159 * thus we can only have AST_VHUB_DESCS_COUNT-1 descriptors
160 * in the list
161 */
162 return (ep->epn.d_last + AST_VHUB_DESCS_COUNT - ep->epn.d_next - 1) &
163 (AST_VHUB_DESCS_COUNT - 1);
164 }
165
ast_vhub_epn_kick_desc(struct ast_vhub_ep * ep,struct ast_vhub_req * req)166 static void ast_vhub_epn_kick_desc(struct ast_vhub_ep *ep,
167 struct ast_vhub_req *req)
168 {
169 struct ast_vhub_desc *desc = NULL;
170 unsigned int act = req->act_count;
171 unsigned int len = req->req.length;
172 unsigned int chunk;
173
174 /* Mark request active if not already */
175 req->active = true;
176
177 /* If the request was already completely written, do nothing */
178 if (req->last_desc >= 0)
179 return;
180
181 EPVDBG(ep, "kick act=%d/%d chunk_max=%d free_descs=%d\n",
182 act, len, ep->epn.chunk_max, ast_vhub_count_free_descs(ep));
183
184 /* While we can create descriptors */
185 while (ast_vhub_count_free_descs(ep) && req->last_desc < 0) {
186 unsigned int d_num;
187
188 /* Grab next free descriptor */
189 d_num = ep->epn.d_next;
190 desc = &ep->epn.descs[d_num];
191 ep->epn.d_next = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1);
192
193 /* Calculate next chunk size */
194 chunk = len - act;
195 if (chunk <= ep->epn.chunk_max) {
196 /*
197 * Is this the last packet ? Because of having up to 8
198 * packets in a descriptor we can't just compare "chunk"
199 * with ep.maxpacket. We have to see if it's a multiple
200 * of it to know if we have to send a zero packet.
201 * Sadly that involves a modulo which is a bit expensive
202 * but probably still better than not doing it.
203 */
204 if (!chunk || !req->req.zero || (chunk % ep->ep.maxpacket) != 0)
205 req->last_desc = d_num;
206 } else {
207 chunk = ep->epn.chunk_max;
208 }
209
210 EPVDBG(ep, " chunk: act=%d/%d chunk=%d last=%d desc=%d free=%d\n",
211 act, len, chunk, req->last_desc, d_num,
212 ast_vhub_count_free_descs(ep));
213
214 /* Populate descriptor */
215 desc->w0 = cpu_to_le32(req->req.dma + act);
216
217 /* Interrupt if end of request or no more descriptors */
218
219 /*
220 * TODO: Be smarter about it, if we don't have enough
221 * descriptors request an interrupt before queue empty
222 * or so in order to be able to populate more before
223 * the HW runs out. This isn't a problem at the moment
224 * as we use 256 descriptors and only put at most one
225 * request in the ring.
226 */
227 desc->w1 = cpu_to_le32(VHUB_DSC1_IN_SET_LEN(chunk));
228 if (req->last_desc >= 0 || !ast_vhub_count_free_descs(ep))
229 desc->w1 |= cpu_to_le32(VHUB_DSC1_IN_INTERRUPT);
230
231 /* Account packet */
232 req->act_count = act = act + chunk;
233 }
234
235 if (likely(desc))
236 vhub_dma_workaround(desc);
237
238 /* Tell HW about new descriptors */
239 writel(VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next),
240 ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
241
242 EPVDBG(ep, "HW kicked, d_next=%d dstat=%08x\n",
243 ep->epn.d_next, readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS));
244 }
245
ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep * ep)246 static void ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep *ep)
247 {
248 struct ast_vhub_req *req;
249 unsigned int len, d_last;
250 u32 stat, stat1;
251
252 /* Read EP status, workaround HW race */
253 do {
254 stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
255 stat1 = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
256 } while(stat != stat1);
257
258 /* Extract RPTR */
259 d_last = VHUB_EP_DMA_RPTR(stat);
260
261 /* Grab current request if any */
262 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
263
264 EPVDBG(ep, "ACK status=%08x is_in=%d ep->d_last=%d..%d\n",
265 stat, ep->epn.is_in, ep->epn.d_last, d_last);
266
267 /* Check all completed descriptors */
268 while (ep->epn.d_last != d_last) {
269 struct ast_vhub_desc *desc;
270 unsigned int d_num;
271 bool is_last_desc;
272
273 /* Grab next completed descriptor */
274 d_num = ep->epn.d_last;
275 desc = &ep->epn.descs[d_num];
276 ep->epn.d_last = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1);
277
278 /* Grab len out of descriptor */
279 len = VHUB_DSC1_IN_LEN(le32_to_cpu(desc->w1));
280
281 EPVDBG(ep, " desc %d len=%d req=%p (act=%d)\n",
282 d_num, len, req, req ? req->active : 0);
283
284 /* If no active request pending, move on */
285 if (!req || !req->active)
286 continue;
287
288 /* Adjust size */
289 req->req.actual += len;
290
291 /* Is that the last chunk ? */
292 is_last_desc = req->last_desc == d_num;
293 CHECK(ep, is_last_desc == (len < ep->ep.maxpacket ||
294 (req->req.actual >= req->req.length &&
295 !req->req.zero)),
296 "Last packet discrepancy: last_desc=%d len=%d r.act=%d "
297 "r.len=%d r.zero=%d mp=%d\n",
298 is_last_desc, len, req->req.actual, req->req.length,
299 req->req.zero, ep->ep.maxpacket);
300
301 if (is_last_desc) {
302 /*
303 * Because we can only have one request at a time
304 * in our descriptor list in this implementation,
305 * d_last and ep->d_last should now be equal
306 */
307 CHECK(ep, d_last == ep->epn.d_last,
308 "DMA read ptr mismatch %d vs %d\n",
309 d_last, ep->epn.d_last);
310
311 /* Note: done will drop and re-acquire the lock */
312 ast_vhub_done(ep, req, 0);
313 req = list_first_entry_or_null(&ep->queue,
314 struct ast_vhub_req,
315 queue);
316 break;
317 }
318 }
319
320 /* More work ? */
321 if (req)
322 ast_vhub_epn_kick_desc(ep, req);
323 }
324
ast_vhub_epn_ack_irq(struct ast_vhub_ep * ep)325 void ast_vhub_epn_ack_irq(struct ast_vhub_ep *ep)
326 {
327 if (ep->epn.desc_mode)
328 ast_vhub_epn_handle_ack_desc(ep);
329 else
330 ast_vhub_epn_handle_ack(ep);
331 }
332
ast_vhub_epn_queue(struct usb_ep * u_ep,struct usb_request * u_req,gfp_t gfp_flags)333 static int ast_vhub_epn_queue(struct usb_ep* u_ep, struct usb_request *u_req,
334 gfp_t gfp_flags)
335 {
336 struct ast_vhub_req *req = to_ast_req(u_req);
337 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
338 struct ast_vhub *vhub = ep->vhub;
339 unsigned long flags;
340 bool empty;
341 int rc;
342
343 /* Paranoid checks */
344 if (!u_req || !u_req->complete || !u_req->buf) {
345 dev_warn(&vhub->pdev->dev, "Bogus EPn request ! u_req=%p\n", u_req);
346 if (u_req) {
347 dev_warn(&vhub->pdev->dev, "complete=%p internal=%d\n",
348 u_req->complete, req->internal);
349 }
350 return -EINVAL;
351 }
352
353 /* Endpoint enabled ? */
354 if (!ep->epn.enabled || !u_ep->desc || !ep->dev || !ep->d_idx ||
355 !ep->dev->enabled) {
356 EPDBG(ep, "Enqueuing request on wrong or disabled EP\n");
357 return -ESHUTDOWN;
358 }
359
360 /* Map request for DMA if possible. For now, the rule for DMA is
361 * that:
362 *
363 * * For single stage mode (no descriptors):
364 *
365 * - The buffer is aligned to a 8 bytes boundary (HW requirement)
366 * - For a OUT endpoint, the request size is a multiple of the EP
367 * packet size (otherwise the controller will DMA past the end
368 * of the buffer if the host is sending a too long packet).
369 *
370 * * For descriptor mode (tx only for now), always.
371 *
372 * We could relax the latter by making the decision to use the bounce
373 * buffer based on the size of a given *segment* of the request rather
374 * than the whole request.
375 */
376 if (ep->epn.desc_mode ||
377 ((((unsigned long)u_req->buf & 7) == 0) &&
378 (ep->epn.is_in || !(u_req->length & (u_ep->maxpacket - 1))))) {
379 rc = usb_gadget_map_request_by_dev(&vhub->pdev->dev, u_req,
380 ep->epn.is_in);
381 if (rc) {
382 dev_warn(&vhub->pdev->dev,
383 "Request mapping failure %d\n", rc);
384 return rc;
385 }
386 } else
387 u_req->dma = 0;
388
389 EPVDBG(ep, "enqueue req @%p\n", req);
390 EPVDBG(ep, " l=%d dma=0x%x zero=%d noshort=%d noirq=%d is_in=%d\n",
391 u_req->length, (u32)u_req->dma, u_req->zero,
392 u_req->short_not_ok, u_req->no_interrupt,
393 ep->epn.is_in);
394
395 /* Initialize request progress fields */
396 u_req->status = -EINPROGRESS;
397 u_req->actual = 0;
398 req->act_count = 0;
399 req->active = false;
400 req->last_desc = -1;
401 spin_lock_irqsave(&vhub->lock, flags);
402 empty = list_empty(&ep->queue);
403
404 /* Add request to list and kick processing if empty */
405 list_add_tail(&req->queue, &ep->queue);
406 if (empty) {
407 if (ep->epn.desc_mode)
408 ast_vhub_epn_kick_desc(ep, req);
409 else
410 ast_vhub_epn_kick(ep, req);
411 }
412 spin_unlock_irqrestore(&vhub->lock, flags);
413
414 return 0;
415 }
416
ast_vhub_stop_active_req(struct ast_vhub_ep * ep,bool restart_ep)417 static void ast_vhub_stop_active_req(struct ast_vhub_ep *ep,
418 bool restart_ep)
419 {
420 u32 state, reg, loops;
421
422 /* Stop DMA activity */
423 if (ep->epn.desc_mode)
424 writel(VHUB_EP_DMA_CTRL_RESET, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
425 else
426 writel(0, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
427
428 /* Wait for it to complete */
429 for (loops = 0; loops < 1000; loops++) {
430 state = readl(ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
431 state = VHUB_EP_DMA_PROC_STATUS(state);
432 if (state == EP_DMA_PROC_RX_IDLE ||
433 state == EP_DMA_PROC_TX_IDLE)
434 break;
435 udelay(1);
436 }
437 if (loops >= 1000)
438 dev_warn(&ep->vhub->pdev->dev, "Timeout waiting for DMA\n");
439
440 /* If we don't have to restart the endpoint, that's it */
441 if (!restart_ep)
442 return;
443
444 /* Restart the endpoint */
445 if (ep->epn.desc_mode) {
446 /*
447 * Take out descriptors by resetting the DMA read
448 * pointer to be equal to the CPU write pointer.
449 *
450 * Note: If we ever support creating descriptors for
451 * requests that aren't the head of the queue, we
452 * may have to do something more complex here,
453 * especially if the request being taken out is
454 * not the current head descriptors.
455 */
456 reg = VHUB_EP_DMA_SET_RPTR(ep->epn.d_next) |
457 VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next);
458 writel(reg, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
459
460 /* Then turn it back on */
461 writel(ep->epn.dma_conf,
462 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
463 } else {
464 /* Single mode: just turn it back on */
465 writel(ep->epn.dma_conf,
466 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
467 }
468 }
469
ast_vhub_epn_dequeue(struct usb_ep * u_ep,struct usb_request * u_req)470 static int ast_vhub_epn_dequeue(struct usb_ep* u_ep, struct usb_request *u_req)
471 {
472 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
473 struct ast_vhub *vhub = ep->vhub;
474 struct ast_vhub_req *req;
475 unsigned long flags;
476 int rc = -EINVAL;
477
478 spin_lock_irqsave(&vhub->lock, flags);
479
480 /* Make sure it's actually queued on this endpoint */
481 list_for_each_entry (req, &ep->queue, queue) {
482 if (&req->req == u_req)
483 break;
484 }
485
486 if (&req->req == u_req) {
487 EPVDBG(ep, "dequeue req @%p active=%d\n",
488 req, req->active);
489 if (req->active)
490 ast_vhub_stop_active_req(ep, true);
491 ast_vhub_done(ep, req, -ECONNRESET);
492 rc = 0;
493 }
494
495 spin_unlock_irqrestore(&vhub->lock, flags);
496 return rc;
497 }
498
ast_vhub_update_epn_stall(struct ast_vhub_ep * ep)499 void ast_vhub_update_epn_stall(struct ast_vhub_ep *ep)
500 {
501 u32 reg;
502
503 if (WARN_ON(ep->d_idx == 0))
504 return;
505 reg = readl(ep->epn.regs + AST_VHUB_EP_CONFIG);
506 if (ep->epn.stalled || ep->epn.wedged)
507 reg |= VHUB_EP_CFG_STALL_CTRL;
508 else
509 reg &= ~VHUB_EP_CFG_STALL_CTRL;
510 writel(reg, ep->epn.regs + AST_VHUB_EP_CONFIG);
511
512 if (!ep->epn.stalled && !ep->epn.wedged)
513 writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx),
514 ep->vhub->regs + AST_VHUB_EP_TOGGLE);
515 }
516
ast_vhub_set_halt_and_wedge(struct usb_ep * u_ep,bool halt,bool wedge)517 static int ast_vhub_set_halt_and_wedge(struct usb_ep* u_ep, bool halt,
518 bool wedge)
519 {
520 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
521 struct ast_vhub *vhub = ep->vhub;
522 unsigned long flags;
523
524 EPDBG(ep, "Set halt (%d) & wedge (%d)\n", halt, wedge);
525
526 if (!u_ep || !u_ep->desc)
527 return -EINVAL;
528 if (ep->d_idx == 0)
529 return 0;
530 if (ep->epn.is_iso)
531 return -EOPNOTSUPP;
532
533 spin_lock_irqsave(&vhub->lock, flags);
534
535 /* Fail with still-busy IN endpoints */
536 if (halt && ep->epn.is_in && !list_empty(&ep->queue)) {
537 spin_unlock_irqrestore(&vhub->lock, flags);
538 return -EAGAIN;
539 }
540 ep->epn.stalled = halt;
541 ep->epn.wedged = wedge;
542 ast_vhub_update_epn_stall(ep);
543
544 spin_unlock_irqrestore(&vhub->lock, flags);
545
546 return 0;
547 }
548
ast_vhub_epn_set_halt(struct usb_ep * u_ep,int value)549 static int ast_vhub_epn_set_halt(struct usb_ep *u_ep, int value)
550 {
551 return ast_vhub_set_halt_and_wedge(u_ep, value != 0, false);
552 }
553
ast_vhub_epn_set_wedge(struct usb_ep * u_ep)554 static int ast_vhub_epn_set_wedge(struct usb_ep *u_ep)
555 {
556 return ast_vhub_set_halt_and_wedge(u_ep, true, true);
557 }
558
ast_vhub_epn_disable(struct usb_ep * u_ep)559 static int ast_vhub_epn_disable(struct usb_ep* u_ep)
560 {
561 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
562 struct ast_vhub *vhub = ep->vhub;
563 unsigned long flags;
564 u32 imask, ep_ier;
565
566 EPDBG(ep, "Disabling !\n");
567
568 spin_lock_irqsave(&vhub->lock, flags);
569
570 ep->epn.enabled = false;
571
572 /* Stop active DMA if any */
573 ast_vhub_stop_active_req(ep, false);
574
575 /* Disable endpoint */
576 writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG);
577
578 /* Disable ACK interrupt */
579 imask = VHUB_EP_IRQ(ep->epn.g_idx);
580 ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER);
581 ep_ier &= ~imask;
582 writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
583 writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
584
585 /* Nuke all pending requests */
586 ast_vhub_nuke(ep, -ESHUTDOWN);
587
588 /* No more descriptor associated with request */
589 ep->ep.desc = NULL;
590
591 spin_unlock_irqrestore(&vhub->lock, flags);
592
593 return 0;
594 }
595
ast_vhub_epn_enable(struct usb_ep * u_ep,const struct usb_endpoint_descriptor * desc)596 static int ast_vhub_epn_enable(struct usb_ep* u_ep,
597 const struct usb_endpoint_descriptor *desc)
598 {
599 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
600 struct ast_vhub_dev *dev;
601 struct ast_vhub *vhub;
602 u16 maxpacket, type;
603 unsigned long flags;
604 u32 ep_conf, ep_ier, imask;
605
606 /* Check arguments */
607 if (!u_ep || !desc)
608 return -EINVAL;
609
610 maxpacket = usb_endpoint_maxp(desc);
611 if (!ep->d_idx || !ep->dev ||
612 desc->bDescriptorType != USB_DT_ENDPOINT ||
613 maxpacket == 0 || maxpacket > ep->ep.maxpacket) {
614 EPDBG(ep, "Invalid EP enable,d_idx=%d,dev=%p,type=%d,mp=%d/%d\n",
615 ep->d_idx, ep->dev, desc->bDescriptorType,
616 maxpacket, ep->ep.maxpacket);
617 return -EINVAL;
618 }
619 if (ep->d_idx != usb_endpoint_num(desc)) {
620 EPDBG(ep, "EP number mismatch !\n");
621 return -EINVAL;
622 }
623
624 if (ep->epn.enabled) {
625 EPDBG(ep, "Already enabled\n");
626 return -EBUSY;
627 }
628 dev = ep->dev;
629 vhub = ep->vhub;
630
631 /* Check device state */
632 if (!dev->driver) {
633 EPDBG(ep, "Bogus device state: driver=%p speed=%d\n",
634 dev->driver, dev->gadget.speed);
635 return -ESHUTDOWN;
636 }
637
638 /* Grab some info from the descriptor */
639 ep->epn.is_in = usb_endpoint_dir_in(desc);
640 ep->ep.maxpacket = maxpacket;
641 type = usb_endpoint_type(desc);
642 ep->epn.d_next = ep->epn.d_last = 0;
643 ep->epn.is_iso = false;
644 ep->epn.stalled = false;
645 ep->epn.wedged = false;
646
647 EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n",
648 ep->epn.is_in ? "in" : "out", usb_ep_type_string(type),
649 usb_endpoint_num(desc), maxpacket);
650
651 /* Can we use DMA descriptor mode ? */
652 ep->epn.desc_mode = ep->epn.descs && ep->epn.is_in;
653 if (ep->epn.desc_mode)
654 memset(ep->epn.descs, 0, 8 * AST_VHUB_DESCS_COUNT);
655
656 /*
657 * Large send function can send up to 8 packets from
658 * one descriptor with a limit of 4095 bytes.
659 */
660 ep->epn.chunk_max = ep->ep.maxpacket;
661 if (ep->epn.is_in) {
662 ep->epn.chunk_max <<= 3;
663 while (ep->epn.chunk_max > 4095)
664 ep->epn.chunk_max -= ep->ep.maxpacket;
665 }
666
667 switch(type) {
668 case USB_ENDPOINT_XFER_CONTROL:
669 EPDBG(ep, "Only one control endpoint\n");
670 return -EINVAL;
671 case USB_ENDPOINT_XFER_INT:
672 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_INT);
673 break;
674 case USB_ENDPOINT_XFER_BULK:
675 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_BULK);
676 break;
677 case USB_ENDPOINT_XFER_ISOC:
678 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_ISO);
679 ep->epn.is_iso = true;
680 break;
681 default:
682 return -EINVAL;
683 }
684
685 /* Encode the rest of the EP config register */
686 if (maxpacket < 1024)
687 ep_conf |= VHUB_EP_CFG_SET_MAX_PKT(maxpacket);
688 if (!ep->epn.is_in)
689 ep_conf |= VHUB_EP_CFG_DIR_OUT;
690 ep_conf |= VHUB_EP_CFG_SET_EP_NUM(usb_endpoint_num(desc));
691 ep_conf |= VHUB_EP_CFG_ENABLE;
692 ep_conf |= VHUB_EP_CFG_SET_DEV(dev->index + 1);
693 EPVDBG(ep, "config=%08x\n", ep_conf);
694
695 spin_lock_irqsave(&vhub->lock, flags);
696
697 /* Disable HW and reset DMA */
698 writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG);
699 writel(VHUB_EP_DMA_CTRL_RESET,
700 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
701
702 /* Configure and enable */
703 writel(ep_conf, ep->epn.regs + AST_VHUB_EP_CONFIG);
704
705 if (ep->epn.desc_mode) {
706 /* Clear DMA status, including the DMA read ptr */
707 writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
708
709 /* Set descriptor base */
710 writel(ep->epn.descs_dma,
711 ep->epn.regs + AST_VHUB_EP_DESC_BASE);
712
713 /* Set base DMA config value */
714 ep->epn.dma_conf = VHUB_EP_DMA_DESC_MODE;
715 if (ep->epn.is_in)
716 ep->epn.dma_conf |= VHUB_EP_DMA_IN_LONG_MODE;
717
718 /* First reset and disable all operations */
719 writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
720 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
721
722 /* Enable descriptor mode */
723 writel(ep->epn.dma_conf,
724 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
725 } else {
726 /* Set base DMA config value */
727 ep->epn.dma_conf = VHUB_EP_DMA_SINGLE_STAGE;
728
729 /* Reset and switch to single stage mode */
730 writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
731 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
732 writel(ep->epn.dma_conf,
733 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
734 writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
735 }
736
737 /* Cleanup data toggle just in case */
738 writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx),
739 vhub->regs + AST_VHUB_EP_TOGGLE);
740
741 /* Cleanup and enable ACK interrupt */
742 imask = VHUB_EP_IRQ(ep->epn.g_idx);
743 writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
744 ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER);
745 ep_ier |= imask;
746 writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
747
748 /* Woot, we are online ! */
749 ep->epn.enabled = true;
750
751 spin_unlock_irqrestore(&vhub->lock, flags);
752
753 return 0;
754 }
755
ast_vhub_epn_dispose(struct usb_ep * u_ep)756 static void ast_vhub_epn_dispose(struct usb_ep *u_ep)
757 {
758 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
759
760 if (WARN_ON(!ep->dev || !ep->d_idx))
761 return;
762
763 EPDBG(ep, "Releasing endpoint\n");
764
765 /* Take it out of the EP list */
766 list_del_init(&ep->ep.ep_list);
767
768 /* Mark the address free in the device */
769 ep->dev->epns[ep->d_idx - 1] = NULL;
770
771 /* Free name & DMA buffers */
772 kfree(ep->ep.name);
773 ep->ep.name = NULL;
774 dma_free_coherent(&ep->vhub->pdev->dev,
775 AST_VHUB_EPn_MAX_PACKET +
776 8 * AST_VHUB_DESCS_COUNT,
777 ep->buf, ep->buf_dma);
778 ep->buf = NULL;
779 ep->epn.descs = NULL;
780
781 /* Mark free */
782 ep->dev = NULL;
783 }
784
785 static const struct usb_ep_ops ast_vhub_epn_ops = {
786 .enable = ast_vhub_epn_enable,
787 .disable = ast_vhub_epn_disable,
788 .dispose = ast_vhub_epn_dispose,
789 .queue = ast_vhub_epn_queue,
790 .dequeue = ast_vhub_epn_dequeue,
791 .set_halt = ast_vhub_epn_set_halt,
792 .set_wedge = ast_vhub_epn_set_wedge,
793 .alloc_request = ast_vhub_alloc_request,
794 .free_request = ast_vhub_free_request,
795 };
796
ast_vhub_alloc_epn(struct ast_vhub_dev * d,u8 addr)797 struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr)
798 {
799 struct ast_vhub *vhub = d->vhub;
800 struct ast_vhub_ep *ep;
801 unsigned long flags;
802 int i;
803
804 /* Find a free one (no device) */
805 spin_lock_irqsave(&vhub->lock, flags);
806 for (i = 0; i < vhub->max_epns; i++)
807 if (vhub->epns[i].dev == NULL)
808 break;
809 if (i >= vhub->max_epns) {
810 spin_unlock_irqrestore(&vhub->lock, flags);
811 return NULL;
812 }
813
814 /* Set it up */
815 ep = &vhub->epns[i];
816 ep->dev = d;
817 spin_unlock_irqrestore(&vhub->lock, flags);
818
819 DDBG(d, "Allocating gen EP %d for addr %d\n", i, addr);
820 INIT_LIST_HEAD(&ep->queue);
821 ep->d_idx = addr;
822 ep->vhub = vhub;
823 ep->ep.ops = &ast_vhub_epn_ops;
824 ep->ep.name = kasprintf(GFP_KERNEL, "ep%d", addr);
825 d->epns[addr-1] = ep;
826 ep->epn.g_idx = i;
827 ep->epn.regs = vhub->regs + 0x200 + (i * 0x10);
828
829 ep->buf = dma_alloc_coherent(&vhub->pdev->dev,
830 AST_VHUB_EPn_MAX_PACKET +
831 8 * AST_VHUB_DESCS_COUNT,
832 &ep->buf_dma, GFP_KERNEL);
833 if (!ep->buf) {
834 kfree(ep->ep.name);
835 ep->ep.name = NULL;
836 return NULL;
837 }
838 ep->epn.descs = ep->buf + AST_VHUB_EPn_MAX_PACKET;
839 ep->epn.descs_dma = ep->buf_dma + AST_VHUB_EPn_MAX_PACKET;
840
841 usb_ep_set_maxpacket_limit(&ep->ep, AST_VHUB_EPn_MAX_PACKET);
842 list_add_tail(&ep->ep.ep_list, &d->gadget.ep_list);
843 ep->ep.caps.type_iso = true;
844 ep->ep.caps.type_bulk = true;
845 ep->ep.caps.type_int = true;
846 ep->ep.caps.dir_in = true;
847 ep->ep.caps.dir_out = true;
848
849 return ep;
850 }
851