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
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/delay.h>
14#include <linux/ioport.h>
15#include <linux/slab.h>
16#include <linux/errno.h>
17#include <linux/list.h>
18#include <linux/interrupt.h>
19#include <linux/proc_fs.h>
20#include <linux/prefetch.h>
21#include <linux/clk.h>
22#include <linux/usb/gadget.h>
23#include <linux/of.h>
24#include <linux/regmap.h>
25#include <linux/dma-mapping.h>
26
27#include "vhub.h"
28
29#define EXTRA_CHECKS
30
31#ifdef EXTRA_CHECKS
32#define CHECK(ep, expr, fmt...) \
33 do { \
34 if (!(expr)) EPDBG(ep, "CHECK:" fmt); \
35 } while(0)
36#else
37#define CHECK(ep, expr, fmt...) do { } while(0)
38#endif
39
40static void ast_vhub_epn_kick(struct ast_vhub_ep *ep, struct ast_vhub_req *req)
41{
42 unsigned int act = req->req.actual;
43 unsigned int len = req->req.length;
44 unsigned int chunk;
45
46 /* There should be no DMA ongoing */
47 WARN_ON(req->active);
48
49 /* Calculate next chunk size */
50 chunk = len - act;
51 if (chunk > ep->ep.maxpacket)
52 chunk = ep->ep.maxpacket;
53 else if ((chunk < ep->ep.maxpacket) || !req->req.zero)
54 req->last_desc = 1;
55
56 EPVDBG(ep, "kick req %p act=%d/%d chunk=%d last=%d\n",
57 req, act, len, chunk, req->last_desc);
58
59 /* If DMA unavailable, using staging EP buffer */
60 if (!req->req.dma) {
61
62 /* For IN transfers, copy data over first */
63 if (ep->epn.is_in) {
64 memcpy(ep->buf, req->req.buf + act, chunk);
65 vhub_dma_workaround(addr: ep->buf);
66 }
67 writel(val: ep->buf_dma, addr: ep->epn.regs + AST_VHUB_EP_DESC_BASE);
68 } else {
69 if (ep->epn.is_in)
70 vhub_dma_workaround(addr: req->req.buf);
71 writel(val: req->req.dma + act, addr: ep->epn.regs + AST_VHUB_EP_DESC_BASE);
72 }
73
74 /* Start DMA */
75 req->active = true;
76 writel(VHUB_EP_DMA_SET_TX_SIZE(chunk),
77 addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
78 writel(VHUB_EP_DMA_SET_TX_SIZE(chunk) | VHUB_EP_DMA_SINGLE_KICK,
79 addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
80}
81
82static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep)
83{
84 struct ast_vhub_req *req;
85 unsigned int len;
86 int status = 0;
87 u32 stat;
88
89 /* Read EP status */
90 stat = readl(addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
91
92 /* Grab current request if any */
93 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
94
95 EPVDBG(ep, "ACK status=%08x is_in=%d, req=%p (active=%d)\n",
96 stat, ep->epn.is_in, req, req ? req->active : 0);
97
98 /* In absence of a request, bail out, must have been dequeued */
99 if (!req)
100 return;
101
102 /*
103 * Request not active, move on to processing queue, active request
104 * was probably dequeued
105 */
106 if (!req->active)
107 goto next_chunk;
108
109 /* Check if HW has moved on */
110 if (VHUB_EP_DMA_RPTR(stat) != 0) {
111 EPDBG(ep, "DMA read pointer not 0 !\n");
112 return;
113 }
114
115 /* No current DMA ongoing */
116 req->active = false;
117
118 /* Grab length out of HW */
119 len = VHUB_EP_DMA_TX_SIZE(stat);
120
121 /* If not using DMA, copy data out if needed */
122 if (!req->req.dma && !ep->epn.is_in && len) {
123 if (req->req.actual + len > req->req.length) {
124 req->last_desc = 1;
125 status = -EOVERFLOW;
126 goto done;
127 } else {
128 memcpy(req->req.buf + req->req.actual, ep->buf, len);
129 }
130 }
131 /* Adjust size */
132 req->req.actual += len;
133
134 /* Check for short packet */
135 if (len < ep->ep.maxpacket)
136 req->last_desc = 1;
137
138done:
139 /* That's it ? complete the request and pick a new one */
140 if (req->last_desc >= 0) {
141 ast_vhub_done(ep, req, status);
142 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req,
143 queue);
144
145 /*
146 * Due to lock dropping inside "done" the next request could
147 * already be active, so check for that and bail if needed.
148 */
149 if (!req || req->active)
150 return;
151 }
152
153 next_chunk:
154 ast_vhub_epn_kick(ep, req);
155}
156
157static inline unsigned int ast_vhub_count_free_descs(struct ast_vhub_ep *ep)
158{
159 /*
160 * d_next == d_last means descriptor list empty to HW,
161 * thus we can only have AST_VHUB_DESCS_COUNT-1 descriptors
162 * in the list
163 */
164 return (ep->epn.d_last + AST_VHUB_DESCS_COUNT - ep->epn.d_next - 1) &
165 (AST_VHUB_DESCS_COUNT - 1);
166}
167
168static void ast_vhub_epn_kick_desc(struct ast_vhub_ep *ep,
169 struct ast_vhub_req *req)
170{
171 struct ast_vhub_desc *desc = NULL;
172 unsigned int act = req->act_count;
173 unsigned int len = req->req.length;
174 unsigned int chunk;
175
176 /* Mark request active if not already */
177 req->active = true;
178
179 /* If the request was already completely written, do nothing */
180 if (req->last_desc >= 0)
181 return;
182
183 EPVDBG(ep, "kick act=%d/%d chunk_max=%d free_descs=%d\n",
184 act, len, ep->epn.chunk_max, ast_vhub_count_free_descs(ep));
185
186 /* While we can create descriptors */
187 while (ast_vhub_count_free_descs(ep) && req->last_desc < 0) {
188 unsigned int d_num;
189
190 /* Grab next free descriptor */
191 d_num = ep->epn.d_next;
192 desc = &ep->epn.descs[d_num];
193 ep->epn.d_next = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1);
194
195 /* Calculate next chunk size */
196 chunk = len - act;
197 if (chunk <= ep->epn.chunk_max) {
198 /*
199 * Is this the last packet ? Because of having up to 8
200 * packets in a descriptor we can't just compare "chunk"
201 * with ep.maxpacket. We have to see if it's a multiple
202 * of it to know if we have to send a zero packet.
203 * Sadly that involves a modulo which is a bit expensive
204 * but probably still better than not doing it.
205 */
206 if (!chunk || !req->req.zero || (chunk % ep->ep.maxpacket) != 0)
207 req->last_desc = d_num;
208 } else {
209 chunk = ep->epn.chunk_max;
210 }
211
212 EPVDBG(ep, " chunk: act=%d/%d chunk=%d last=%d desc=%d free=%d\n",
213 act, len, chunk, req->last_desc, d_num,
214 ast_vhub_count_free_descs(ep));
215
216 /* Populate descriptor */
217 desc->w0 = cpu_to_le32(req->req.dma + act);
218
219 /* Interrupt if end of request or no more descriptors */
220
221 /*
222 * TODO: Be smarter about it, if we don't have enough
223 * descriptors request an interrupt before queue empty
224 * or so in order to be able to populate more before
225 * the HW runs out. This isn't a problem at the moment
226 * as we use 256 descriptors and only put at most one
227 * request in the ring.
228 */
229 desc->w1 = cpu_to_le32(VHUB_DSC1_IN_SET_LEN(chunk));
230 if (req->last_desc >= 0 || !ast_vhub_count_free_descs(ep))
231 desc->w1 |= cpu_to_le32(VHUB_DSC1_IN_INTERRUPT);
232
233 /* Account packet */
234 req->act_count = act = act + chunk;
235 }
236
237 if (likely(desc))
238 vhub_dma_workaround(addr: desc);
239
240 /* Tell HW about new descriptors */
241 writel(VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next),
242 addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
243
244 EPVDBG(ep, "HW kicked, d_next=%d dstat=%08x\n",
245 ep->epn.d_next, readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS));
246}
247
248static void ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep *ep)
249{
250 struct ast_vhub_req *req;
251 unsigned int len, d_last;
252 u32 stat, stat1;
253
254 /* Read EP status, workaround HW race */
255 do {
256 stat = readl(addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
257 stat1 = readl(addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
258 } while(stat != stat1);
259
260 /* Extract RPTR */
261 d_last = VHUB_EP_DMA_RPTR(stat);
262
263 /* Grab current request if any */
264 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
265
266 EPVDBG(ep, "ACK status=%08x is_in=%d ep->d_last=%d..%d\n",
267 stat, ep->epn.is_in, ep->epn.d_last, d_last);
268
269 /* Check all completed descriptors */
270 while (ep->epn.d_last != d_last) {
271 struct ast_vhub_desc *desc;
272 unsigned int d_num;
273 bool is_last_desc;
274
275 /* Grab next completed descriptor */
276 d_num = ep->epn.d_last;
277 desc = &ep->epn.descs[d_num];
278 ep->epn.d_last = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1);
279
280 /* Grab len out of descriptor */
281 len = VHUB_DSC1_IN_LEN(le32_to_cpu(desc->w1));
282
283 EPVDBG(ep, " desc %d len=%d req=%p (act=%d)\n",
284 d_num, len, req, req ? req->active : 0);
285
286 /* If no active request pending, move on */
287 if (!req || !req->active)
288 continue;
289
290 /* Adjust size */
291 req->req.actual += len;
292
293 /* Is that the last chunk ? */
294 is_last_desc = req->last_desc == d_num;
295 CHECK(ep, is_last_desc == (len < ep->ep.maxpacket ||
296 (req->req.actual >= req->req.length &&
297 !req->req.zero)),
298 "Last packet discrepancy: last_desc=%d len=%d r.act=%d "
299 "r.len=%d r.zero=%d mp=%d\n",
300 is_last_desc, len, req->req.actual, req->req.length,
301 req->req.zero, ep->ep.maxpacket);
302
303 if (is_last_desc) {
304 /*
305 * Because we can only have one request at a time
306 * in our descriptor list in this implementation,
307 * d_last and ep->d_last should now be equal
308 */
309 CHECK(ep, d_last == ep->epn.d_last,
310 "DMA read ptr mismatch %d vs %d\n",
311 d_last, ep->epn.d_last);
312
313 /* Note: done will drop and re-acquire the lock */
314 ast_vhub_done(ep, req, status: 0);
315 req = list_first_entry_or_null(&ep->queue,
316 struct ast_vhub_req,
317 queue);
318 break;
319 }
320 }
321
322 /* More work ? */
323 if (req)
324 ast_vhub_epn_kick_desc(ep, req);
325}
326
327void ast_vhub_epn_ack_irq(struct ast_vhub_ep *ep)
328{
329 if (ep->epn.desc_mode)
330 ast_vhub_epn_handle_ack_desc(ep);
331 else
332 ast_vhub_epn_handle_ack(ep);
333}
334
335static int ast_vhub_epn_queue(struct usb_ep* u_ep, struct usb_request *u_req,
336 gfp_t gfp_flags)
337{
338 struct ast_vhub_req *req = to_ast_req(u_req);
339 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
340 struct ast_vhub *vhub = ep->vhub;
341 unsigned long flags;
342 bool empty;
343 int rc;
344
345 /* Paranoid checks */
346 if (!u_req || !u_req->complete || !u_req->buf) {
347 dev_warn(&vhub->pdev->dev, "Bogus EPn request ! u_req=%p\n", u_req);
348 if (u_req) {
349 dev_warn(&vhub->pdev->dev, "complete=%p internal=%d\n",
350 u_req->complete, req->internal);
351 }
352 return -EINVAL;
353 }
354
355 /* Endpoint enabled ? */
356 if (!ep->epn.enabled || !u_ep->desc || !ep->dev || !ep->d_idx ||
357 !ep->dev->enabled) {
358 EPDBG(ep, "Enqueuing request on wrong or disabled EP\n");
359 return -ESHUTDOWN;
360 }
361
362 /* Map request for DMA if possible. For now, the rule for DMA is
363 * that:
364 *
365 * * For single stage mode (no descriptors):
366 *
367 * - The buffer is aligned to a 8 bytes boundary (HW requirement)
368 * - For a OUT endpoint, the request size is a multiple of the EP
369 * packet size (otherwise the controller will DMA past the end
370 * of the buffer if the host is sending a too long packet).
371 *
372 * * For descriptor mode (tx only for now), always.
373 *
374 * We could relax the latter by making the decision to use the bounce
375 * buffer based on the size of a given *segment* of the request rather
376 * than the whole request.
377 */
378 if (ep->epn.desc_mode ||
379 ((((unsigned long)u_req->buf & 7) == 0) &&
380 (ep->epn.is_in || !(u_req->length & (u_ep->maxpacket - 1))))) {
381 rc = usb_gadget_map_request_by_dev(dev: &vhub->pdev->dev, req: u_req,
382 is_in: ep->epn.is_in);
383 if (rc) {
384 dev_warn(&vhub->pdev->dev,
385 "Request mapping failure %d\n", rc);
386 return rc;
387 }
388 } else
389 u_req->dma = 0;
390
391 EPVDBG(ep, "enqueue req @%p\n", req);
392 EPVDBG(ep, " l=%d dma=0x%x zero=%d noshort=%d noirq=%d is_in=%d\n",
393 u_req->length, (u32)u_req->dma, u_req->zero,
394 u_req->short_not_ok, u_req->no_interrupt,
395 ep->epn.is_in);
396
397 /* Initialize request progress fields */
398 u_req->status = -EINPROGRESS;
399 u_req->actual = 0;
400 req->act_count = 0;
401 req->active = false;
402 req->last_desc = -1;
403 spin_lock_irqsave(&vhub->lock, flags);
404 empty = list_empty(head: &ep->queue);
405
406 /* Add request to list and kick processing if empty */
407 list_add_tail(new: &req->queue, head: &ep->queue);
408 if (empty) {
409 if (ep->epn.desc_mode)
410 ast_vhub_epn_kick_desc(ep, req);
411 else
412 ast_vhub_epn_kick(ep, req);
413 }
414 spin_unlock_irqrestore(lock: &vhub->lock, flags);
415
416 return 0;
417}
418
419static void ast_vhub_stop_active_req(struct ast_vhub_ep *ep,
420 bool restart_ep)
421{
422 u32 state, reg, loops;
423
424 /* Stop DMA activity */
425 if (ep->epn.desc_mode)
426 writel(VHUB_EP_DMA_CTRL_RESET, addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
427 else
428 writel(val: 0, addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
429
430 /* Wait for it to complete */
431 for (loops = 0; loops < 1000; loops++) {
432 state = readl(addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
433 state = VHUB_EP_DMA_PROC_STATUS(state);
434 if (state == EP_DMA_PROC_RX_IDLE ||
435 state == EP_DMA_PROC_TX_IDLE)
436 break;
437 udelay(1);
438 }
439 if (loops >= 1000)
440 dev_warn(&ep->vhub->pdev->dev, "Timeout waiting for DMA\n");
441
442 /* If we don't have to restart the endpoint, that's it */
443 if (!restart_ep)
444 return;
445
446 /* Restart the endpoint */
447 if (ep->epn.desc_mode) {
448 /*
449 * Take out descriptors by resetting the DMA read
450 * pointer to be equal to the CPU write pointer.
451 *
452 * Note: If we ever support creating descriptors for
453 * requests that aren't the head of the queue, we
454 * may have to do something more complex here,
455 * especially if the request being taken out is
456 * not the current head descriptors.
457 */
458 reg = VHUB_EP_DMA_SET_RPTR(ep->epn.d_next) |
459 VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next);
460 writel(val: reg, addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
461
462 /* Then turn it back on */
463 writel(val: ep->epn.dma_conf,
464 addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
465 } else {
466 /* Single mode: just turn it back on */
467 writel(val: ep->epn.dma_conf,
468 addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
469 }
470}
471
472static int ast_vhub_epn_dequeue(struct usb_ep* u_ep, struct usb_request *u_req)
473{
474 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
475 struct ast_vhub *vhub = ep->vhub;
476 struct ast_vhub_req *req = NULL, *iter;
477 unsigned long flags;
478 int rc = -EINVAL;
479
480 spin_lock_irqsave(&vhub->lock, flags);
481
482 /* Make sure it's actually queued on this endpoint */
483 list_for_each_entry(iter, &ep->queue, queue) {
484 if (&iter->req != u_req)
485 continue;
486 req = iter;
487 break;
488 }
489
490 if (req) {
491 EPVDBG(ep, "dequeue req @%p active=%d\n",
492 req, req->active);
493 if (req->active)
494 ast_vhub_stop_active_req(ep, restart_ep: true);
495 ast_vhub_done(ep, req, status: -ECONNRESET);
496 rc = 0;
497 }
498
499 spin_unlock_irqrestore(lock: &vhub->lock, flags);
500 return rc;
501}
502
503void ast_vhub_update_epn_stall(struct ast_vhub_ep *ep)
504{
505 u32 reg;
506
507 if (WARN_ON(ep->d_idx == 0))
508 return;
509 reg = readl(addr: ep->epn.regs + AST_VHUB_EP_CONFIG);
510 if (ep->epn.stalled || ep->epn.wedged)
511 reg |= VHUB_EP_CFG_STALL_CTRL;
512 else
513 reg &= ~VHUB_EP_CFG_STALL_CTRL;
514 writel(val: reg, addr: ep->epn.regs + AST_VHUB_EP_CONFIG);
515
516 if (!ep->epn.stalled && !ep->epn.wedged)
517 writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx),
518 addr: ep->vhub->regs + AST_VHUB_EP_TOGGLE);
519}
520
521static int ast_vhub_set_halt_and_wedge(struct usb_ep* u_ep, bool halt,
522 bool wedge)
523{
524 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
525 struct ast_vhub *vhub = ep->vhub;
526 unsigned long flags;
527
528 EPDBG(ep, "Set halt (%d) & wedge (%d)\n", halt, wedge);
529
530 if (!u_ep || !u_ep->desc)
531 return -EINVAL;
532 if (ep->d_idx == 0)
533 return 0;
534 if (ep->epn.is_iso)
535 return -EOPNOTSUPP;
536
537 spin_lock_irqsave(&vhub->lock, flags);
538
539 /* Fail with still-busy IN endpoints */
540 if (halt && ep->epn.is_in && !list_empty(head: &ep->queue)) {
541 spin_unlock_irqrestore(lock: &vhub->lock, flags);
542 return -EAGAIN;
543 }
544 ep->epn.stalled = halt;
545 ep->epn.wedged = wedge;
546 ast_vhub_update_epn_stall(ep);
547
548 spin_unlock_irqrestore(lock: &vhub->lock, flags);
549
550 return 0;
551}
552
553static int ast_vhub_epn_set_halt(struct usb_ep *u_ep, int value)
554{
555 return ast_vhub_set_halt_and_wedge(u_ep, halt: value != 0, wedge: false);
556}
557
558static int ast_vhub_epn_set_wedge(struct usb_ep *u_ep)
559{
560 return ast_vhub_set_halt_and_wedge(u_ep, halt: true, wedge: true);
561}
562
563static int ast_vhub_epn_disable(struct usb_ep* u_ep)
564{
565 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
566 struct ast_vhub *vhub = ep->vhub;
567 unsigned long flags;
568 u32 imask, ep_ier;
569
570 EPDBG(ep, "Disabling !\n");
571
572 spin_lock_irqsave(&vhub->lock, flags);
573
574 ep->epn.enabled = false;
575
576 /* Stop active DMA if any */
577 ast_vhub_stop_active_req(ep, restart_ep: false);
578
579 /* Disable endpoint */
580 writel(val: 0, addr: ep->epn.regs + AST_VHUB_EP_CONFIG);
581
582 /* Disable ACK interrupt */
583 imask = VHUB_EP_IRQ(ep->epn.g_idx);
584 ep_ier = readl(addr: vhub->regs + AST_VHUB_EP_ACK_IER);
585 ep_ier &= ~imask;
586 writel(val: ep_ier, addr: vhub->regs + AST_VHUB_EP_ACK_IER);
587 writel(val: imask, addr: vhub->regs + AST_VHUB_EP_ACK_ISR);
588
589 /* Nuke all pending requests */
590 ast_vhub_nuke(ep, status: -ESHUTDOWN);
591
592 /* No more descriptor associated with request */
593 ep->ep.desc = NULL;
594
595 spin_unlock_irqrestore(lock: &vhub->lock, flags);
596
597 return 0;
598}
599
600static int ast_vhub_epn_enable(struct usb_ep* u_ep,
601 const struct usb_endpoint_descriptor *desc)
602{
603 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
604 struct ast_vhub_dev *dev;
605 struct ast_vhub *vhub;
606 u16 maxpacket, type;
607 unsigned long flags;
608 u32 ep_conf, ep_ier, imask;
609
610 /* Check arguments */
611 if (!u_ep || !desc)
612 return -EINVAL;
613
614 maxpacket = usb_endpoint_maxp(epd: desc);
615 if (!ep->d_idx || !ep->dev ||
616 desc->bDescriptorType != USB_DT_ENDPOINT ||
617 maxpacket == 0 || maxpacket > ep->ep.maxpacket) {
618 EPDBG(ep, "Invalid EP enable,d_idx=%d,dev=%p,type=%d,mp=%d/%d\n",
619 ep->d_idx, ep->dev, desc->bDescriptorType,
620 maxpacket, ep->ep.maxpacket);
621 return -EINVAL;
622 }
623 if (ep->d_idx != usb_endpoint_num(epd: desc)) {
624 EPDBG(ep, "EP number mismatch !\n");
625 return -EINVAL;
626 }
627
628 if (ep->epn.enabled) {
629 EPDBG(ep, "Already enabled\n");
630 return -EBUSY;
631 }
632 dev = ep->dev;
633 vhub = ep->vhub;
634
635 /* Check device state */
636 if (!dev->driver) {
637 EPDBG(ep, "Bogus device state: driver=%p speed=%d\n",
638 dev->driver, dev->gadget.speed);
639 return -ESHUTDOWN;
640 }
641
642 /* Grab some info from the descriptor */
643 ep->epn.is_in = usb_endpoint_dir_in(epd: desc);
644 ep->ep.maxpacket = maxpacket;
645 type = usb_endpoint_type(epd: desc);
646 ep->epn.d_next = ep->epn.d_last = 0;
647 ep->epn.is_iso = false;
648 ep->epn.stalled = false;
649 ep->epn.wedged = false;
650
651 EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n",
652 ep->epn.is_in ? "in" : "out", usb_ep_type_string(type),
653 usb_endpoint_num(desc), maxpacket);
654
655 /* Can we use DMA descriptor mode ? */
656 ep->epn.desc_mode = ep->epn.descs && ep->epn.is_in;
657 if (ep->epn.desc_mode)
658 memset(ep->epn.descs, 0, 8 * AST_VHUB_DESCS_COUNT);
659
660 /*
661 * Large send function can send up to 8 packets from
662 * one descriptor with a limit of 4095 bytes.
663 */
664 ep->epn.chunk_max = ep->ep.maxpacket;
665 if (ep->epn.is_in) {
666 ep->epn.chunk_max <<= 3;
667 while (ep->epn.chunk_max > 4095)
668 ep->epn.chunk_max -= ep->ep.maxpacket;
669 }
670
671 switch(type) {
672 case USB_ENDPOINT_XFER_CONTROL:
673 EPDBG(ep, "Only one control endpoint\n");
674 return -EINVAL;
675 case USB_ENDPOINT_XFER_INT:
676 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_INT);
677 break;
678 case USB_ENDPOINT_XFER_BULK:
679 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_BULK);
680 break;
681 case USB_ENDPOINT_XFER_ISOC:
682 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_ISO);
683 ep->epn.is_iso = true;
684 break;
685 default:
686 return -EINVAL;
687 }
688
689 /* Encode the rest of the EP config register */
690 if (maxpacket < 1024)
691 ep_conf |= VHUB_EP_CFG_SET_MAX_PKT(maxpacket);
692 if (!ep->epn.is_in)
693 ep_conf |= VHUB_EP_CFG_DIR_OUT;
694 ep_conf |= VHUB_EP_CFG_SET_EP_NUM(usb_endpoint_num(desc));
695 ep_conf |= VHUB_EP_CFG_ENABLE;
696 ep_conf |= VHUB_EP_CFG_SET_DEV(dev->index + 1);
697 EPVDBG(ep, "config=%08x\n", ep_conf);
698
699 spin_lock_irqsave(&vhub->lock, flags);
700
701 /* Disable HW and reset DMA */
702 writel(val: 0, addr: ep->epn.regs + AST_VHUB_EP_CONFIG);
703 writel(VHUB_EP_DMA_CTRL_RESET,
704 addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
705
706 /* Configure and enable */
707 writel(val: ep_conf, addr: ep->epn.regs + AST_VHUB_EP_CONFIG);
708
709 if (ep->epn.desc_mode) {
710 /* Clear DMA status, including the DMA read ptr */
711 writel(val: 0, addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
712
713 /* Set descriptor base */
714 writel(val: ep->epn.descs_dma,
715 addr: ep->epn.regs + AST_VHUB_EP_DESC_BASE);
716
717 /* Set base DMA config value */
718 ep->epn.dma_conf = VHUB_EP_DMA_DESC_MODE;
719 if (ep->epn.is_in)
720 ep->epn.dma_conf |= VHUB_EP_DMA_IN_LONG_MODE;
721
722 /* First reset and disable all operations */
723 writel(val: ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
724 addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
725
726 /* Enable descriptor mode */
727 writel(val: ep->epn.dma_conf,
728 addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
729 } else {
730 /* Set base DMA config value */
731 ep->epn.dma_conf = VHUB_EP_DMA_SINGLE_STAGE;
732
733 /* Reset and switch to single stage mode */
734 writel(val: ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
735 addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
736 writel(val: ep->epn.dma_conf,
737 addr: ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
738 writel(val: 0, addr: ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
739 }
740
741 /* Cleanup data toggle just in case */
742 writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx),
743 addr: vhub->regs + AST_VHUB_EP_TOGGLE);
744
745 /* Cleanup and enable ACK interrupt */
746 imask = VHUB_EP_IRQ(ep->epn.g_idx);
747 writel(val: imask, addr: vhub->regs + AST_VHUB_EP_ACK_ISR);
748 ep_ier = readl(addr: vhub->regs + AST_VHUB_EP_ACK_IER);
749 ep_ier |= imask;
750 writel(val: ep_ier, addr: vhub->regs + AST_VHUB_EP_ACK_IER);
751
752 /* Woot, we are online ! */
753 ep->epn.enabled = true;
754
755 spin_unlock_irqrestore(lock: &vhub->lock, flags);
756
757 return 0;
758}
759
760static void ast_vhub_epn_dispose(struct usb_ep *u_ep)
761{
762 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
763
764 if (WARN_ON(!ep->dev || !ep->d_idx))
765 return;
766
767 EPDBG(ep, "Releasing endpoint\n");
768
769 /* Take it out of the EP list */
770 list_del_init(entry: &ep->ep.ep_list);
771
772 /* Mark the address free in the device */
773 ep->dev->epns[ep->d_idx - 1] = NULL;
774
775 /* Free name & DMA buffers */
776 kfree(objp: ep->ep.name);
777 ep->ep.name = NULL;
778 dma_free_coherent(dev: &ep->vhub->pdev->dev,
779 AST_VHUB_EPn_MAX_PACKET +
780 8 * AST_VHUB_DESCS_COUNT,
781 cpu_addr: ep->buf, dma_handle: ep->buf_dma);
782 ep->buf = NULL;
783 ep->epn.descs = NULL;
784
785 /* Mark free */
786 ep->dev = NULL;
787}
788
789static const struct usb_ep_ops ast_vhub_epn_ops = {
790 .enable = ast_vhub_epn_enable,
791 .disable = ast_vhub_epn_disable,
792 .dispose = ast_vhub_epn_dispose,
793 .queue = ast_vhub_epn_queue,
794 .dequeue = ast_vhub_epn_dequeue,
795 .set_halt = ast_vhub_epn_set_halt,
796 .set_wedge = ast_vhub_epn_set_wedge,
797 .alloc_request = ast_vhub_alloc_request,
798 .free_request = ast_vhub_free_request,
799};
800
801struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr)
802{
803 struct ast_vhub *vhub = d->vhub;
804 struct ast_vhub_ep *ep;
805 unsigned long flags;
806 int i;
807
808 /* Find a free one (no device) */
809 spin_lock_irqsave(&vhub->lock, flags);
810 for (i = 0; i < vhub->max_epns; i++)
811 if (vhub->epns[i].dev == NULL)
812 break;
813 if (i >= vhub->max_epns) {
814 spin_unlock_irqrestore(lock: &vhub->lock, flags);
815 return NULL;
816 }
817
818 /* Set it up */
819 ep = &vhub->epns[i];
820 ep->dev = d;
821 spin_unlock_irqrestore(lock: &vhub->lock, flags);
822
823 DDBG(d, "Allocating gen EP %d for addr %d\n", i, addr);
824 INIT_LIST_HEAD(list: &ep->queue);
825 ep->d_idx = addr;
826 ep->vhub = vhub;
827 ep->ep.ops = &ast_vhub_epn_ops;
828 ep->ep.name = kasprintf(GFP_KERNEL, fmt: "ep%d", addr);
829 d->epns[addr-1] = ep;
830 ep->epn.g_idx = i;
831 ep->epn.regs = vhub->regs + 0x200 + (i * 0x10);
832
833 ep->buf = dma_alloc_coherent(dev: &vhub->pdev->dev,
834 AST_VHUB_EPn_MAX_PACKET +
835 8 * AST_VHUB_DESCS_COUNT,
836 dma_handle: &ep->buf_dma, GFP_KERNEL);
837 if (!ep->buf) {
838 kfree(objp: ep->ep.name);
839 ep->ep.name = NULL;
840 return NULL;
841 }
842 ep->epn.descs = ep->buf + AST_VHUB_EPn_MAX_PACKET;
843 ep->epn.descs_dma = ep->buf_dma + AST_VHUB_EPn_MAX_PACKET;
844
845 usb_ep_set_maxpacket_limit(ep: &ep->ep, AST_VHUB_EPn_MAX_PACKET);
846 list_add_tail(new: &ep->ep.ep_list, head: &d->gadget.ep_list);
847 ep->ep.caps.type_iso = true;
848 ep->ep.caps.type_bulk = true;
849 ep->ep.caps.type_int = true;
850 ep->ep.caps.dir_in = true;
851 ep->ep.caps.dir_out = true;
852
853 return ep;
854}
855

source code of linux/drivers/usb/gadget/udc/aspeed-vhub/epn.c