xref: /linux/drivers/usb/gadget/udc/aspeed-vhub/epn.c (revision 1ac731c529cd4d6adbce134754b51ff7d822b145)
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 
ast_vhub_epn_kick(struct ast_vhub_ep * ep,struct ast_vhub_req * req)40 static 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(ep->buf);
66 		}
67 		writel(ep->buf_dma, ep->epn.regs + AST_VHUB_EP_DESC_BASE);
68 	} else {
69 		if (ep->epn.is_in)
70 			vhub_dma_workaround(req->req.buf);
71 		writel(req->req.dma + act, 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 	       ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
78 	writel(VHUB_EP_DMA_SET_TX_SIZE(chunk) | VHUB_EP_DMA_SINGLE_KICK,
79 	       ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
80 }
81 
ast_vhub_epn_handle_ack(struct ast_vhub_ep * ep)82 static 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(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 
138 done:
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 
ast_vhub_count_free_descs(struct ast_vhub_ep * ep)157 static 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 
ast_vhub_epn_kick_desc(struct ast_vhub_ep * ep,struct ast_vhub_req * req)168 static 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(desc);
239 
240 	/* Tell HW about new descriptors */
241 	writel(VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next),
242 	       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 
ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep * ep)248 static 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(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
257 		stat1 = readl(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, 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 
ast_vhub_epn_ack_irq(struct ast_vhub_ep * ep)327 void 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 
ast_vhub_epn_queue(struct usb_ep * u_ep,struct usb_request * u_req,gfp_t gfp_flags)335 static 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(&vhub->pdev->dev, u_req,
382 					    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(&ep->queue);
405 
406 	/* Add request to list and kick processing if empty */
407 	list_add_tail(&req->queue, &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(&vhub->lock, flags);
415 
416 	return 0;
417 }
418 
ast_vhub_stop_active_req(struct ast_vhub_ep * ep,bool restart_ep)419 static 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, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
427 	else
428 		writel(0, 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(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(reg, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
461 
462 		/* Then turn it back on */
463 		writel(ep->epn.dma_conf,
464 		       ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
465 	} else {
466 		/* Single mode: just turn it back on */
467 		writel(ep->epn.dma_conf,
468 		       ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
469 	}
470 }
471 
ast_vhub_epn_dequeue(struct usb_ep * u_ep,struct usb_request * u_req)472 static 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, true);
495 		ast_vhub_done(ep, req, -ECONNRESET);
496 		rc = 0;
497 	}
498 
499 	spin_unlock_irqrestore(&vhub->lock, flags);
500 	return rc;
501 }
502 
ast_vhub_update_epn_stall(struct ast_vhub_ep * ep)503 void 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(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(reg, 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 		       ep->vhub->regs + AST_VHUB_EP_TOGGLE);
519 }
520 
ast_vhub_set_halt_and_wedge(struct usb_ep * u_ep,bool halt,bool wedge)521 static 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(&ep->queue)) {
541 		spin_unlock_irqrestore(&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(&vhub->lock, flags);
549 
550 	return 0;
551 }
552 
ast_vhub_epn_set_halt(struct usb_ep * u_ep,int value)553 static int ast_vhub_epn_set_halt(struct usb_ep *u_ep, int value)
554 {
555 	return ast_vhub_set_halt_and_wedge(u_ep, value != 0, false);
556 }
557 
ast_vhub_epn_set_wedge(struct usb_ep * u_ep)558 static int ast_vhub_epn_set_wedge(struct usb_ep *u_ep)
559 {
560 	return ast_vhub_set_halt_and_wedge(u_ep, true, true);
561 }
562 
ast_vhub_epn_disable(struct usb_ep * u_ep)563 static 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, false);
578 
579 	/* Disable endpoint */
580 	writel(0, 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(vhub->regs + AST_VHUB_EP_ACK_IER);
585 	ep_ier &= ~imask;
586 	writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
587 	writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
588 
589 	/* Nuke all pending requests */
590 	ast_vhub_nuke(ep, -ESHUTDOWN);
591 
592 	/* No more descriptor associated with request */
593 	ep->ep.desc = NULL;
594 
595 	spin_unlock_irqrestore(&vhub->lock, flags);
596 
597 	return 0;
598 }
599 
ast_vhub_epn_enable(struct usb_ep * u_ep,const struct usb_endpoint_descriptor * desc)600 static 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(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(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(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;
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(0, ep->epn.regs + AST_VHUB_EP_CONFIG);
703 	writel(VHUB_EP_DMA_CTRL_RESET,
704 	       ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
705 
706 	/* Configure and enable */
707 	writel(ep_conf, 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(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
712 
713 		/* Set descriptor base */
714 		writel(ep->epn.descs_dma,
715 		       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(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
724 		       ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
725 
726 		/* Enable descriptor mode */
727 		writel(ep->epn.dma_conf,
728 		       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(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);
739 	}
740 
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);
744 
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);
749 	ep_ier |= imask;
750 	writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
751 
752 	/* Woot, we are online ! */
753 	ep->epn.enabled = true;
754 
755 	spin_unlock_irqrestore(&vhub->lock, flags);
756 
757 	return 0;
758 }
759 
ast_vhub_epn_dispose(struct usb_ep * u_ep)760 static 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(&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(ep->ep.name);
777 	ep->ep.name = NULL;
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);
782 	ep->buf = NULL;
783 	ep->epn.descs = NULL;
784 
785 	/* Mark free */
786 	ep->dev = NULL;
787 }
788 
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,
799 };
800 
ast_vhub_alloc_epn(struct ast_vhub_dev * d,u8 addr)801 struct 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(&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(&vhub->lock, flags);
822 
823 	DDBG(d, "Allocating gen EP %d for addr %d\n", i, addr);
824 	INIT_LIST_HEAD(&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, "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(&vhub->pdev->dev,
834 				     AST_VHUB_EPn_MAX_PACKET +
835 				     8 * AST_VHUB_DESCS_COUNT,
836 				     &ep->buf_dma, GFP_KERNEL);
837 	if (!ep->buf) {
838 		kfree(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, 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;
852 
853 	return ep;
854 }
855