1 // SPDX-License-Identifier: GPL-2.0+
3 * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget
5 * epn.c - Generic endpoints management
7 * Copyright 2017 IBM Corporation
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.
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>
29 #include <linux/of_gpio.h>
30 #include <linux/regmap.h>
31 #include <linux/dma-mapping.h>
38 #define CHECK(ep, expr, fmt...) \
40 if (!(expr)) EPDBG(ep, "CHECK:" fmt); \
43 #define CHECK(ep, expr, fmt...) do { } while(0)
46 static void ast_vhub_epn_kick(struct ast_vhub_ep *ep, struct ast_vhub_req *req)
48 unsigned int act = req->req.actual;
49 unsigned int len = req->req.length;
52 /* There should be no DMA ongoing */
55 /* Calculate next chunk size */
57 if (chunk > ep->ep.maxpacket)
58 chunk = ep->ep.maxpacket;
59 else if ((chunk < ep->ep.maxpacket) || !req->req.zero)
62 EPVDBG(ep, "kick req %p act=%d/%d chunk=%d last=%d\n",
63 req, act, len, chunk, req->last_desc);
65 /* If DMA unavailable, using staging EP buffer */
68 /* For IN transfers, copy data over first */
70 memcpy(ep->buf, req->req.buf + act, chunk);
71 vhub_dma_workaround(ep->buf);
73 writel(ep->buf_dma, ep->epn.regs + AST_VHUB_EP_DESC_BASE);
76 vhub_dma_workaround(req->req.buf);
77 writel(req->req.dma + act, ep->epn.regs + AST_VHUB_EP_DESC_BASE);
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);
88 static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep)
90 struct ast_vhub_req *req;
95 stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
97 /* Grab current request if any */
98 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
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);
103 /* In absence of a request, bail out, must have been dequeued */
108 * Request not active, move on to processing queue, active request
109 * was probably dequeued
114 /* Check if HW has moved on */
115 if (VHUB_EP_DMA_RPTR(stat) != 0) {
116 EPDBG(ep, "DMA read pointer not 0 !\n");
120 /* No current DMA ongoing */
123 /* Grab lenght out of HW */
124 len = VHUB_EP_DMA_TX_SIZE(stat);
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);
131 req->req.actual += len;
133 /* Check for short packet */
134 if (len < ep->ep.maxpacket)
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,
144 * Due to lock dropping inside "done" the next request could
145 * already be active, so check for that and bail if needed.
147 if (!req || req->active)
152 ast_vhub_epn_kick(ep, req);
155 static inline unsigned int ast_vhub_count_free_descs(struct ast_vhub_ep *ep)
158 * d_next == d_last means descriptor list empty to HW,
159 * thus we can only have AST_VHUB_DESCS_COUNT-1 descriptors
162 return (ep->epn.d_last + AST_VHUB_DESCS_COUNT - ep->epn.d_next - 1) &
163 (AST_VHUB_DESCS_COUNT - 1);
166 static void ast_vhub_epn_kick_desc(struct ast_vhub_ep *ep,
167 struct ast_vhub_req *req)
169 struct ast_vhub_desc *desc = NULL;
170 unsigned int act = req->act_count;
171 unsigned int len = req->req.length;
174 /* Mark request active if not already */
177 /* If the request was already completely written, do nothing */
178 if (req->last_desc >= 0)
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));
184 /* While we can create descriptors */
185 while (ast_vhub_count_free_descs(ep) && req->last_desc < 0) {
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);
193 /* Calculate next chunk size */
195 if (chunk <= ep->epn.chunk_max) {
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.
204 if (!chunk || !req->req.zero || (chunk % ep->ep.maxpacket) != 0)
205 req->last_desc = d_num;
207 chunk = ep->epn.chunk_max;
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));
214 /* Populate descriptor */
215 desc->w0 = cpu_to_le32(req->req.dma + act);
217 /* Interrupt if end of request or no more descriptors */
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.
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);
232 req->act_count = act = act + chunk;
236 vhub_dma_workaround(desc);
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);
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));
246 static void ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep *ep)
248 struct ast_vhub_req *req;
249 unsigned int len, d_last;
252 /* Read EP status, workaround HW race */
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);
259 d_last = VHUB_EP_DMA_RPTR(stat);
261 /* Grab current request if any */
262 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
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);
267 /* Check all completed descriptors */
268 while (ep->epn.d_last != d_last) {
269 struct ast_vhub_desc *desc;
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);
278 /* Grab len out of descriptor */
279 len = VHUB_DSC1_IN_LEN(le32_to_cpu(desc->w1));
281 EPVDBG(ep, " desc %d len=%d req=%p (act=%d)\n",
282 d_num, len, req, req ? req->active : 0);
284 /* If no active request pending, move on */
285 if (!req || !req->active)
289 req->req.actual += len;
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 &&
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);
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
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);
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,
322 ast_vhub_epn_kick_desc(ep, req);
325 void ast_vhub_epn_ack_irq(struct ast_vhub_ep *ep)
327 if (ep->epn.desc_mode)
328 ast_vhub_epn_handle_ack_desc(ep);
330 ast_vhub_epn_handle_ack(ep);
333 static int ast_vhub_epn_queue(struct usb_ep* u_ep, struct usb_request *u_req,
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;
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);
347 dev_warn(&vhub->pdev->dev, "complete=%p internal=%d\n",
348 u_req->complete, req->internal);
353 /* Endpoint enabled ? */
354 if (!ep->epn.enabled || !u_ep->desc || !ep->dev || !ep->d_idx ||
355 !ep->dev->enabled || ep->dev->suspended) {
356 EPDBG(ep,"Enqueing request on wrong or disabled EP\n");
360 /* Map request for DMA if possible. For now, the rule for DMA is
363 * * For single stage mode (no descriptors):
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).
370 * * For descriptor mode (tx only for now), always.
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.
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,
382 dev_warn(&vhub->pdev->dev,
383 "Request mapping failure %d\n", rc);
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,
395 /* Initialize request progress fields */
396 u_req->status = -EINPROGRESS;
401 spin_lock_irqsave(&vhub->lock, flags);
402 empty = list_empty(&ep->queue);
404 /* Add request to list and kick processing if empty */
405 list_add_tail(&req->queue, &ep->queue);
407 if (ep->epn.desc_mode)
408 ast_vhub_epn_kick_desc(ep, req);
410 ast_vhub_epn_kick(ep, req);
412 spin_unlock_irqrestore(&vhub->lock, flags);
417 static void ast_vhub_stop_active_req(struct ast_vhub_ep *ep,
420 u32 state, reg, loops;
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);
426 writel(0, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
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)
438 dev_warn(&ep->vhub->pdev->dev, "Timeout waiting for DMA\n");
440 /* If we don't have to restart the endpoint, that's it */
444 /* Restart the endpoint */
445 if (ep->epn.desc_mode) {
447 * Take out descriptors by resetting the DMA read
448 * pointer to be equal to the CPU write pointer.
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.
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);
460 /* Then turn it back on */
461 writel(ep->epn.dma_conf,
462 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
464 /* Single mode: just turn it back on */
465 writel(ep->epn.dma_conf,
466 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
470 static int ast_vhub_epn_dequeue(struct usb_ep* u_ep, struct usb_request *u_req)
472 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
473 struct ast_vhub *vhub = ep->vhub;
474 struct ast_vhub_req *req;
478 spin_lock_irqsave(&vhub->lock, flags);
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)
486 if (&req->req == u_req) {
487 EPVDBG(ep, "dequeue req @%p active=%d\n",
490 ast_vhub_stop_active_req(ep, true);
491 ast_vhub_done(ep, req, -ECONNRESET);
495 spin_unlock_irqrestore(&vhub->lock, flags);
499 void ast_vhub_update_epn_stall(struct ast_vhub_ep *ep)
503 if (WARN_ON(ep->d_idx == 0))
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;
509 reg &= ~VHUB_EP_CFG_STALL_CTRL;
510 writel(reg, ep->epn.regs + AST_VHUB_EP_CONFIG);
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);
517 static int ast_vhub_set_halt_and_wedge(struct usb_ep* u_ep, bool halt,
520 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
521 struct ast_vhub *vhub = ep->vhub;
524 EPDBG(ep, "Set halt (%d) & wedge (%d)\n", halt, wedge);
526 if (!u_ep || !u_ep->desc)
533 spin_lock_irqsave(&vhub->lock, flags);
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);
540 ep->epn.stalled = halt;
541 ep->epn.wedged = wedge;
542 ast_vhub_update_epn_stall(ep);
544 spin_unlock_irqrestore(&vhub->lock, flags);
549 static int ast_vhub_epn_set_halt(struct usb_ep *u_ep, int value)
551 return ast_vhub_set_halt_and_wedge(u_ep, value != 0, false);
554 static int ast_vhub_epn_set_wedge(struct usb_ep *u_ep)
556 return ast_vhub_set_halt_and_wedge(u_ep, true, true);
559 static int ast_vhub_epn_disable(struct usb_ep* u_ep)
561 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
562 struct ast_vhub *vhub = ep->vhub;
566 EPDBG(ep, "Disabling !\n");
568 spin_lock_irqsave(&vhub->lock, flags);
570 ep->epn.enabled = false;
572 /* Stop active DMA if any */
573 ast_vhub_stop_active_req(ep, false);
575 /* Disable endpoint */
576 writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG);
578 /* Disable ACK interrupt */
579 imask = VHUB_EP_IRQ(ep->epn.g_idx);
580 ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER);
582 writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
583 writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
585 /* Nuke all pending requests */
586 ast_vhub_nuke(ep, -ESHUTDOWN);
588 /* No more descriptor associated with request */
591 spin_unlock_irqrestore(&vhub->lock, flags);
596 static int ast_vhub_epn_enable(struct usb_ep* u_ep,
597 const struct usb_endpoint_descriptor *desc)
599 static const char *ep_type_string[] __maybe_unused = { "ctrl",
603 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
604 struct ast_vhub_dev *dev;
605 struct ast_vhub *vhub;
608 u32 ep_conf, ep_ier, imask;
610 /* Check arguments */
614 maxpacket = usb_endpoint_maxp(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);
623 if (ep->d_idx != usb_endpoint_num(desc)) {
624 EPDBG(ep, "EP number mismatch !\n");
628 if (ep->epn.enabled) {
629 EPDBG(ep, "Already enabled\n");
635 /* Check device state */
637 EPDBG(ep, "Bogus device state: driver=%p speed=%d\n",
638 dev->driver, dev->gadget.speed);
642 /* Grab some info from the descriptor */
643 ep->epn.is_in = usb_endpoint_dir_in(desc);
644 ep->ep.maxpacket = maxpacket;
645 type = usb_endpoint_type(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;
651 EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n",
652 ep->epn.is_in ? "in" : "out", ep_type_string[type],
653 usb_endpoint_num(desc), maxpacket);
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);
661 * Large send function can send up to 8 packets from
662 * one descriptor with a limit of 4095 bytes.
664 ep->epn.chunk_max = ep->ep.maxpacket;
666 ep->epn.chunk_max <<= 3;
667 while (ep->epn.chunk_max > 4095)
668 ep->epn.chunk_max -= ep->ep.maxpacket;
672 case USB_ENDPOINT_XFER_CONTROL:
673 EPDBG(ep, "Only one control endpoint\n");
675 case USB_ENDPOINT_XFER_INT:
676 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_INT);
678 case USB_ENDPOINT_XFER_BULK:
679 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_BULK);
681 case USB_ENDPOINT_XFER_ISOC:
682 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_ISO);
683 ep->epn.is_iso = true;
689 /* Encode the rest of the EP config register */
690 if (maxpacket < 1024)
691 ep_conf |= VHUB_EP_CFG_SET_MAX_PKT(maxpacket);
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);
699 spin_lock_irqsave(&vhub->lock, flags);
701 /* Disable HW and reset DMA */
702 writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG);
703 writel(VHUB_EP_DMA_CTRL_RESET,
704 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
706 /* Configure and enable */
707 writel(ep_conf, ep->epn.regs + AST_VHUB_EP_CONFIG);
709 if (ep->epn.desc_mode) {
710 /* Clear DMA status, including the DMA read ptr */
711 writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
713 /* Set descriptor base */
714 writel(ep->epn.descs_dma,
715 ep->epn.regs + AST_VHUB_EP_DESC_BASE);
717 /* Set base DMA config value */
718 ep->epn.dma_conf = VHUB_EP_DMA_DESC_MODE;
720 ep->epn.dma_conf |= VHUB_EP_DMA_IN_LONG_MODE;
722 /* First reset and disable all operations */
723 writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
724 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
726 /* Enable descriptor mode */
727 writel(ep->epn.dma_conf,
728 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
730 /* Set base DMA config value */
731 ep->epn.dma_conf = VHUB_EP_DMA_SINGLE_STAGE;
733 /* Reset and switch to single stage mode */
734 writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
735 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
736 writel(ep->epn.dma_conf,
737 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
738 writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
741 /* Cleanup data toggle just in case */
742 writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx),
743 vhub->regs + AST_VHUB_EP_TOGGLE);
745 /* Cleanup and enable ACK interrupt */
746 imask = VHUB_EP_IRQ(ep->epn.g_idx);
747 writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
748 ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER);
750 writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
752 /* Woot, we are online ! */
753 ep->epn.enabled = true;
755 spin_unlock_irqrestore(&vhub->lock, flags);
760 static void ast_vhub_epn_dispose(struct usb_ep *u_ep)
762 struct ast_vhub_ep *ep = to_ast_ep(u_ep);
764 if (WARN_ON(!ep->dev || !ep->d_idx))
767 EPDBG(ep, "Releasing endpoint\n");
769 /* Take it out of the EP list */
770 list_del_init(&ep->ep.ep_list);
772 /* Mark the address free in the device */
773 ep->dev->epns[ep->d_idx - 1] = NULL;
775 /* Free name & DMA buffers */
778 dma_free_coherent(&ep->vhub->pdev->dev,
779 AST_VHUB_EPn_MAX_PACKET +
780 8 * AST_VHUB_DESCS_COUNT,
781 ep->buf, ep->buf_dma);
783 ep->epn.descs = NULL;
789 static 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,
801 struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr)
803 struct ast_vhub *vhub = d->vhub;
804 struct ast_vhub_ep *ep;
808 /* Find a free one (no device) */
809 spin_lock_irqsave(&vhub->lock, flags);
810 for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++)
811 if (vhub->epns[i].dev == NULL)
813 if (i >= AST_VHUB_NUM_GEN_EPs) {
814 spin_unlock_irqrestore(&vhub->lock, flags);
821 spin_unlock_irqrestore(&vhub->lock, flags);
823 DDBG(d, "Allocating gen EP %d for addr %d\n", i, addr);
824 INIT_LIST_HEAD(&ep->queue);
827 ep->ep.ops = &ast_vhub_epn_ops;
828 ep->ep.name = kasprintf(GFP_KERNEL, "ep%d", addr);
829 d->epns[addr-1] = ep;
831 ep->epn.regs = vhub->regs + 0x200 + (i * 0x10);
833 ep->buf = dma_alloc_coherent(&vhub->pdev->dev,
834 AST_VHUB_EPn_MAX_PACKET +
835 8 * AST_VHUB_DESCS_COUNT,
836 &ep->buf_dma, GFP_KERNEL);
842 ep->epn.descs = ep->buf + AST_VHUB_EPn_MAX_PACKET;
843 ep->epn.descs_dma = ep->buf_dma + AST_VHUB_EPn_MAX_PACKET;
845 usb_ep_set_maxpacket_limit(&ep->ep, AST_VHUB_EPn_MAX_PACKET);
846 list_add_tail(&ep->ep.ep_list, &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;