1 /*
2  * Renesas USB driver
3  *
4  * Copyright (C) 2011 Renesas Solutions Corp.
5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
15  *
16  */
17 #include <linux/delay.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/io.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/usb/ch9.h>
23 #include <linux/usb/gadget.h>
24 #include <linux/usb/otg.h>
25 #include "common.h"
26 
27 /*
28  *		struct
29  */
30 struct usbhsg_request {
31 	struct usb_request	req;
32 	struct usbhs_pkt	pkt;
33 };
34 
35 #define EP_NAME_SIZE 8
36 struct usbhsg_gpriv;
37 struct usbhsg_uep {
38 	struct usb_ep		 ep;
39 	struct usbhs_pipe	*pipe;
40 
41 	char ep_name[EP_NAME_SIZE];
42 
43 	struct usbhsg_gpriv *gpriv;
44 };
45 
46 struct usbhsg_gpriv {
47 	struct usb_gadget	 gadget;
48 	struct usbhs_mod	 mod;
49 
50 	struct usbhsg_uep	*uep;
51 	int			 uep_size;
52 
53 	struct usb_gadget_driver	*driver;
54 	struct usb_phy		*transceiver;
55 	bool			 vbus_active;
56 
57 	u32	status;
58 #define USBHSG_STATUS_STARTED		(1 << 0)
59 #define USBHSG_STATUS_REGISTERD		(1 << 1)
60 #define USBHSG_STATUS_WEDGE		(1 << 2)
61 #define USBHSG_STATUS_SELF_POWERED	(1 << 3)
62 #define USBHSG_STATUS_SOFT_CONNECT	(1 << 4)
63 };
64 
65 struct usbhsg_recip_handle {
66 	char *name;
67 	int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
68 		      struct usb_ctrlrequest *ctrl);
69 	int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
70 			 struct usb_ctrlrequest *ctrl);
71 	int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
72 			struct usb_ctrlrequest *ctrl);
73 };
74 
75 /*
76  *		macro
77  */
78 #define usbhsg_priv_to_gpriv(priv)			\
79 	container_of(					\
80 		usbhs_mod_get(priv, USBHS_GADGET),	\
81 		struct usbhsg_gpriv, mod)
82 
83 #define __usbhsg_for_each_uep(start, pos, g, i)	\
84 	for ((i) = start;					\
85 	     ((i) < (g)->uep_size) && ((pos) = (g)->uep + (i));	\
86 	     (i)++)
87 
88 #define usbhsg_for_each_uep(pos, gpriv, i)	\
89 	__usbhsg_for_each_uep(1, pos, gpriv, i)
90 
91 #define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)	\
92 	__usbhsg_for_each_uep(0, pos, gpriv, i)
93 
94 #define usbhsg_gadget_to_gpriv(g)\
95 	container_of(g, struct usbhsg_gpriv, gadget)
96 
97 #define usbhsg_req_to_ureq(r)\
98 	container_of(r, struct usbhsg_request, req)
99 
100 #define usbhsg_ep_to_uep(e)		container_of(e, struct usbhsg_uep, ep)
101 #define usbhsg_gpriv_to_dev(gp)		usbhs_priv_to_dev((gp)->mod.priv)
102 #define usbhsg_gpriv_to_priv(gp)	((gp)->mod.priv)
103 #define usbhsg_gpriv_to_dcp(gp)		((gp)->uep)
104 #define usbhsg_gpriv_to_nth_uep(gp, i)	((gp)->uep + i)
105 #define usbhsg_uep_to_gpriv(u)		((u)->gpriv)
106 #define usbhsg_uep_to_pipe(u)		((u)->pipe)
107 #define usbhsg_pipe_to_uep(p)		((p)->mod_private)
108 #define usbhsg_is_dcp(u)		((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
109 
110 #define usbhsg_ureq_to_pkt(u)		(&(u)->pkt)
111 #define usbhsg_pkt_to_ureq(i)	\
112 	container_of(i, struct usbhsg_request, pkt)
113 
114 #define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
115 
116 /* status */
117 #define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
118 #define usbhsg_status_set(gp, b) (gp->status |=  b)
119 #define usbhsg_status_clr(gp, b) (gp->status &= ~b)
120 #define usbhsg_status_has(gp, b) (gp->status &   b)
121 
122 /*
123  *		queue push/pop
124  */
125 static void __usbhsg_queue_pop(struct usbhsg_uep *uep,
126 			       struct usbhsg_request *ureq,
127 			       int status)
128 {
129 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
130 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
131 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
132 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
133 
134 	if (pipe)
135 		dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
136 
137 	ureq->req.status = status;
138 	spin_unlock(usbhs_priv_to_lock(priv));
139 	usb_gadget_giveback_request(&uep->ep, &ureq->req);
140 	spin_lock(usbhs_priv_to_lock(priv));
141 }
142 
143 static void usbhsg_queue_pop(struct usbhsg_uep *uep,
144 			     struct usbhsg_request *ureq,
145 			     int status)
146 {
147 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
148 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
149 	unsigned long flags;
150 
151 	usbhs_lock(priv, flags);
152 	__usbhsg_queue_pop(uep, ureq, status);
153 	usbhs_unlock(priv, flags);
154 }
155 
156 static void usbhsg_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt)
157 {
158 	struct usbhs_pipe *pipe = pkt->pipe;
159 	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
160 	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
161 	unsigned long flags;
162 
163 	ureq->req.actual = pkt->actual;
164 
165 	usbhs_lock(priv, flags);
166 	if (uep)
167 		__usbhsg_queue_pop(uep, ureq, 0);
168 	usbhs_unlock(priv, flags);
169 }
170 
171 static void usbhsg_queue_push(struct usbhsg_uep *uep,
172 			      struct usbhsg_request *ureq)
173 {
174 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
175 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
176 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
177 	struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
178 	struct usb_request *req = &ureq->req;
179 
180 	req->actual = 0;
181 	req->status = -EINPROGRESS;
182 	usbhs_pkt_push(pipe, pkt, usbhsg_queue_done,
183 		       req->buf, req->length, req->zero, -1);
184 	usbhs_pkt_start(pipe);
185 
186 	dev_dbg(dev, "pipe %d : queue push (%d)\n",
187 		usbhs_pipe_number(pipe),
188 		req->length);
189 }
190 
191 /*
192  *		dma map/unmap
193  */
194 static int usbhsg_dma_map_ctrl(struct device *dma_dev, struct usbhs_pkt *pkt,
195 			       int map)
196 {
197 	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
198 	struct usb_request *req = &ureq->req;
199 	struct usbhs_pipe *pipe = pkt->pipe;
200 	enum dma_data_direction dir;
201 	int ret = 0;
202 
203 	dir = usbhs_pipe_is_dir_host(pipe);
204 
205 	if (map) {
206 		/* it can not use scatter/gather */
207 		WARN_ON(req->num_sgs);
208 
209 		ret = usb_gadget_map_request_by_dev(dma_dev, req, dir);
210 		if (ret < 0)
211 			return ret;
212 
213 		pkt->dma = req->dma;
214 	} else {
215 		usb_gadget_unmap_request_by_dev(dma_dev, req, dir);
216 	}
217 
218 	return ret;
219 }
220 
221 /*
222  *		USB_TYPE_STANDARD / clear feature functions
223  */
224 static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
225 						 struct usbhsg_uep *uep,
226 						 struct usb_ctrlrequest *ctrl)
227 {
228 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
229 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
230 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
231 
232 	usbhs_dcp_control_transfer_done(pipe);
233 
234 	return 0;
235 }
236 
237 static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
238 						   struct usbhsg_uep *uep,
239 						   struct usb_ctrlrequest *ctrl)
240 {
241 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
242 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
243 
244 	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
245 		usbhs_pipe_disable(pipe);
246 		usbhs_pipe_sequence_data0(pipe);
247 		usbhs_pipe_enable(pipe);
248 	}
249 
250 	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
251 
252 	usbhs_pkt_start(pipe);
253 
254 	return 0;
255 }
256 
257 static struct usbhsg_recip_handle req_clear_feature = {
258 	.name		= "clear feature",
259 	.device		= usbhsg_recip_handler_std_control_done,
260 	.interface	= usbhsg_recip_handler_std_control_done,
261 	.endpoint	= usbhsg_recip_handler_std_clear_endpoint,
262 };
263 
264 /*
265  *		USB_TYPE_STANDARD / set feature functions
266  */
267 static int usbhsg_recip_handler_std_set_device(struct usbhs_priv *priv,
268 						 struct usbhsg_uep *uep,
269 						 struct usb_ctrlrequest *ctrl)
270 {
271 	switch (le16_to_cpu(ctrl->wValue)) {
272 	case USB_DEVICE_TEST_MODE:
273 		usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
274 		udelay(100);
275 		usbhs_sys_set_test_mode(priv, le16_to_cpu(ctrl->wIndex >> 8));
276 		break;
277 	default:
278 		usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
279 		break;
280 	}
281 
282 	return 0;
283 }
284 
285 static int usbhsg_recip_handler_std_set_endpoint(struct usbhs_priv *priv,
286 						 struct usbhsg_uep *uep,
287 						 struct usb_ctrlrequest *ctrl)
288 {
289 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
290 
291 	usbhs_pipe_stall(pipe);
292 
293 	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
294 
295 	return 0;
296 }
297 
298 static struct usbhsg_recip_handle req_set_feature = {
299 	.name		= "set feature",
300 	.device		= usbhsg_recip_handler_std_set_device,
301 	.interface	= usbhsg_recip_handler_std_control_done,
302 	.endpoint	= usbhsg_recip_handler_std_set_endpoint,
303 };
304 
305 /*
306  *		USB_TYPE_STANDARD / get status functions
307  */
308 static void __usbhsg_recip_send_complete(struct usb_ep *ep,
309 					 struct usb_request *req)
310 {
311 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
312 
313 	/* free allocated recip-buffer/usb_request */
314 	kfree(ureq->pkt.buf);
315 	usb_ep_free_request(ep, req);
316 }
317 
318 static void __usbhsg_recip_send_status(struct usbhsg_gpriv *gpriv,
319 				       unsigned short status)
320 {
321 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
322 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
323 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
324 	struct usb_request *req;
325 	unsigned short *buf;
326 
327 	/* alloc new usb_request for recip */
328 	req = usb_ep_alloc_request(&dcp->ep, GFP_ATOMIC);
329 	if (!req) {
330 		dev_err(dev, "recip request allocation fail\n");
331 		return;
332 	}
333 
334 	/* alloc recip data buffer */
335 	buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
336 	if (!buf) {
337 		usb_ep_free_request(&dcp->ep, req);
338 		dev_err(dev, "recip data allocation fail\n");
339 		return;
340 	}
341 
342 	/* recip data is status */
343 	*buf = cpu_to_le16(status);
344 
345 	/* allocated usb_request/buffer will be freed */
346 	req->complete	= __usbhsg_recip_send_complete;
347 	req->buf	= buf;
348 	req->length	= sizeof(*buf);
349 	req->zero	= 0;
350 
351 	/* push packet */
352 	pipe->handler = &usbhs_fifo_pio_push_handler;
353 	usbhsg_queue_push(dcp, usbhsg_req_to_ureq(req));
354 }
355 
356 static int usbhsg_recip_handler_std_get_device(struct usbhs_priv *priv,
357 					       struct usbhsg_uep *uep,
358 					       struct usb_ctrlrequest *ctrl)
359 {
360 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
361 	unsigned short status = 0;
362 
363 	if (usbhsg_status_has(gpriv, USBHSG_STATUS_SELF_POWERED))
364 		status = 1 << USB_DEVICE_SELF_POWERED;
365 
366 	__usbhsg_recip_send_status(gpriv, status);
367 
368 	return 0;
369 }
370 
371 static int usbhsg_recip_handler_std_get_interface(struct usbhs_priv *priv,
372 						  struct usbhsg_uep *uep,
373 						  struct usb_ctrlrequest *ctrl)
374 {
375 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
376 	unsigned short status = 0;
377 
378 	__usbhsg_recip_send_status(gpriv, status);
379 
380 	return 0;
381 }
382 
383 static int usbhsg_recip_handler_std_get_endpoint(struct usbhs_priv *priv,
384 						 struct usbhsg_uep *uep,
385 						 struct usb_ctrlrequest *ctrl)
386 {
387 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
388 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
389 	unsigned short status = 0;
390 
391 	if (usbhs_pipe_is_stall(pipe))
392 		status = 1 << USB_ENDPOINT_HALT;
393 
394 	__usbhsg_recip_send_status(gpriv, status);
395 
396 	return 0;
397 }
398 
399 static struct usbhsg_recip_handle req_get_status = {
400 	.name		= "get status",
401 	.device		= usbhsg_recip_handler_std_get_device,
402 	.interface	= usbhsg_recip_handler_std_get_interface,
403 	.endpoint	= usbhsg_recip_handler_std_get_endpoint,
404 };
405 
406 /*
407  *		USB_TYPE handler
408  */
409 static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
410 				   struct usbhsg_recip_handle *handler,
411 				   struct usb_ctrlrequest *ctrl)
412 {
413 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
414 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
415 	struct usbhsg_uep *uep;
416 	struct usbhs_pipe *pipe;
417 	int recip = ctrl->bRequestType & USB_RECIP_MASK;
418 	int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
419 	int ret = 0;
420 	int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
421 		    struct usb_ctrlrequest *ctrl);
422 	char *msg;
423 
424 	uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
425 	pipe = usbhsg_uep_to_pipe(uep);
426 	if (!pipe) {
427 		dev_err(dev, "wrong recip request\n");
428 		return -EINVAL;
429 	}
430 
431 	switch (recip) {
432 	case USB_RECIP_DEVICE:
433 		msg	= "DEVICE";
434 		func	= handler->device;
435 		break;
436 	case USB_RECIP_INTERFACE:
437 		msg	= "INTERFACE";
438 		func	= handler->interface;
439 		break;
440 	case USB_RECIP_ENDPOINT:
441 		msg	= "ENDPOINT";
442 		func	= handler->endpoint;
443 		break;
444 	default:
445 		dev_warn(dev, "unsupported RECIP(%d)\n", recip);
446 		func = NULL;
447 		ret = -EINVAL;
448 	}
449 
450 	if (func) {
451 		dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
452 		ret = func(priv, uep, ctrl);
453 	}
454 
455 	return ret;
456 }
457 
458 /*
459  *		irq functions
460  *
461  * it will be called from usbhs_interrupt
462  */
463 static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
464 				struct usbhs_irq_state *irq_state)
465 {
466 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
467 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
468 
469 	gpriv->gadget.speed = usbhs_bus_get_speed(priv);
470 
471 	dev_dbg(dev, "state = %x : speed : %d\n",
472 		usbhs_status_get_device_state(irq_state),
473 		gpriv->gadget.speed);
474 
475 	return 0;
476 }
477 
478 static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
479 				 struct usbhs_irq_state *irq_state)
480 {
481 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
482 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
483 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
484 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
485 	struct usb_ctrlrequest ctrl;
486 	struct usbhsg_recip_handle *recip_handler = NULL;
487 	int stage = usbhs_status_get_ctrl_stage(irq_state);
488 	int ret = 0;
489 
490 	dev_dbg(dev, "stage = %d\n", stage);
491 
492 	/*
493 	 * see Manual
494 	 *
495 	 *  "Operation"
496 	 *  - "Interrupt Function"
497 	 *    - "Control Transfer Stage Transition Interrupt"
498 	 *      - Fig. "Control Transfer Stage Transitions"
499 	 */
500 
501 	switch (stage) {
502 	case READ_DATA_STAGE:
503 		pipe->handler = &usbhs_fifo_pio_push_handler;
504 		break;
505 	case WRITE_DATA_STAGE:
506 		pipe->handler = &usbhs_fifo_pio_pop_handler;
507 		break;
508 	case NODATA_STATUS_STAGE:
509 		pipe->handler = &usbhs_ctrl_stage_end_handler;
510 		break;
511 	case READ_STATUS_STAGE:
512 	case WRITE_STATUS_STAGE:
513 		usbhs_dcp_control_transfer_done(pipe);
514 	default:
515 		return ret;
516 	}
517 
518 	/*
519 	 * get usb request
520 	 */
521 	usbhs_usbreq_get_val(priv, &ctrl);
522 
523 	switch (ctrl.bRequestType & USB_TYPE_MASK) {
524 	case USB_TYPE_STANDARD:
525 		switch (ctrl.bRequest) {
526 		case USB_REQ_CLEAR_FEATURE:
527 			recip_handler = &req_clear_feature;
528 			break;
529 		case USB_REQ_SET_FEATURE:
530 			recip_handler = &req_set_feature;
531 			break;
532 		case USB_REQ_GET_STATUS:
533 			recip_handler = &req_get_status;
534 			break;
535 		}
536 	}
537 
538 	/*
539 	 * setup stage / run recip
540 	 */
541 	if (recip_handler)
542 		ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
543 	else
544 		ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
545 
546 	if (ret < 0)
547 		usbhs_pipe_stall(pipe);
548 
549 	return ret;
550 }
551 
552 /*
553  *
554  *		usb_dcp_ops
555  *
556  */
557 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
558 {
559 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
560 	struct usbhs_pkt *pkt;
561 
562 	while (1) {
563 		pkt = usbhs_pkt_pop(pipe, NULL);
564 		if (!pkt)
565 			break;
566 
567 		usbhsg_queue_pop(uep, usbhsg_pkt_to_ureq(pkt), -ESHUTDOWN);
568 	}
569 
570 	usbhs_pipe_disable(pipe);
571 
572 	return 0;
573 }
574 
575 /*
576  *
577  *		usb_ep_ops
578  *
579  */
580 static int usbhsg_ep_enable(struct usb_ep *ep,
581 			 const struct usb_endpoint_descriptor *desc)
582 {
583 	struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
584 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
585 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
586 	struct usbhs_pipe *pipe;
587 	int ret = -EIO;
588 
589 	/*
590 	 * if it already have pipe,
591 	 * nothing to do
592 	 */
593 	if (uep->pipe) {
594 		usbhs_pipe_clear(uep->pipe);
595 		usbhs_pipe_sequence_data0(uep->pipe);
596 		return 0;
597 	}
598 
599 	pipe = usbhs_pipe_malloc(priv,
600 				 usb_endpoint_type(desc),
601 				 usb_endpoint_dir_in(desc));
602 	if (pipe) {
603 		uep->pipe		= pipe;
604 		pipe->mod_private	= uep;
605 
606 		/* set epnum / maxp */
607 		usbhs_pipe_config_update(pipe, 0,
608 					 usb_endpoint_num(desc),
609 					 usb_endpoint_maxp(desc));
610 
611 		/*
612 		 * usbhs_fifo_dma_push/pop_handler try to
613 		 * use dmaengine if possible.
614 		 * It will use pio handler if impossible.
615 		 */
616 		if (usb_endpoint_dir_in(desc))
617 			pipe->handler = &usbhs_fifo_dma_push_handler;
618 		else
619 			pipe->handler = &usbhs_fifo_dma_pop_handler;
620 
621 		ret = 0;
622 	}
623 
624 	return ret;
625 }
626 
627 static int usbhsg_ep_disable(struct usb_ep *ep)
628 {
629 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
630 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
631 
632 	if (!pipe)
633 		return -EINVAL;
634 
635 	usbhsg_pipe_disable(uep);
636 	usbhs_pipe_free(pipe);
637 
638 	uep->pipe->mod_private	= NULL;
639 	uep->pipe		= NULL;
640 
641 	return 0;
642 }
643 
644 static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
645 						   gfp_t gfp_flags)
646 {
647 	struct usbhsg_request *ureq;
648 
649 	ureq = kzalloc(sizeof *ureq, gfp_flags);
650 	if (!ureq)
651 		return NULL;
652 
653 	usbhs_pkt_init(usbhsg_ureq_to_pkt(ureq));
654 
655 	return &ureq->req;
656 }
657 
658 static void usbhsg_ep_free_request(struct usb_ep *ep,
659 				   struct usb_request *req)
660 {
661 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
662 
663 	WARN_ON(!list_empty(&ureq->pkt.node));
664 	kfree(ureq);
665 }
666 
667 static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
668 			  gfp_t gfp_flags)
669 {
670 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
671 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
672 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
673 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
674 
675 	/* param check */
676 	if (usbhsg_is_not_connected(gpriv)	||
677 	    unlikely(!gpriv->driver)		||
678 	    unlikely(!pipe))
679 		return -ESHUTDOWN;
680 
681 	usbhsg_queue_push(uep, ureq);
682 
683 	return 0;
684 }
685 
686 static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
687 {
688 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
689 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
690 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
691 
692 	if (pipe)
693 		usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
694 
695 	/*
696 	 * To dequeue a request, this driver should call the usbhsg_queue_pop()
697 	 * even if the pipe is NULL.
698 	 */
699 	usbhsg_queue_pop(uep, ureq, -ECONNRESET);
700 
701 	return 0;
702 }
703 
704 static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
705 {
706 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
707 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
708 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
709 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
710 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
711 	unsigned long flags;
712 
713 	usbhsg_pipe_disable(uep);
714 
715 	dev_dbg(dev, "set halt %d (pipe %d)\n",
716 		halt, usbhs_pipe_number(pipe));
717 
718 	/********************  spin lock ********************/
719 	usbhs_lock(priv, flags);
720 
721 	if (halt)
722 		usbhs_pipe_stall(pipe);
723 	else
724 		usbhs_pipe_disable(pipe);
725 
726 	if (halt && wedge)
727 		usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
728 	else
729 		usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
730 
731 	usbhs_unlock(priv, flags);
732 	/********************  spin unlock ******************/
733 
734 	return 0;
735 }
736 
737 static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
738 {
739 	return __usbhsg_ep_set_halt_wedge(ep, value, 0);
740 }
741 
742 static int usbhsg_ep_set_wedge(struct usb_ep *ep)
743 {
744 	return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
745 }
746 
747 static struct usb_ep_ops usbhsg_ep_ops = {
748 	.enable		= usbhsg_ep_enable,
749 	.disable	= usbhsg_ep_disable,
750 
751 	.alloc_request	= usbhsg_ep_alloc_request,
752 	.free_request	= usbhsg_ep_free_request,
753 
754 	.queue		= usbhsg_ep_queue,
755 	.dequeue	= usbhsg_ep_dequeue,
756 
757 	.set_halt	= usbhsg_ep_set_halt,
758 	.set_wedge	= usbhsg_ep_set_wedge,
759 };
760 
761 /*
762  *		pullup control
763  */
764 static int usbhsg_can_pullup(struct usbhs_priv *priv)
765 {
766 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
767 
768 	return gpriv->driver &&
769 	       usbhsg_status_has(gpriv, USBHSG_STATUS_SOFT_CONNECT);
770 }
771 
772 static void usbhsg_update_pullup(struct usbhs_priv *priv)
773 {
774 	if (usbhsg_can_pullup(priv))
775 		usbhs_sys_function_pullup(priv, 1);
776 	else
777 		usbhs_sys_function_pullup(priv, 0);
778 }
779 
780 /*
781  *		usb module start/end
782  */
783 static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
784 {
785 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
786 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
787 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
788 	struct device *dev = usbhs_priv_to_dev(priv);
789 	unsigned long flags;
790 	int ret = 0;
791 
792 	/********************  spin lock ********************/
793 	usbhs_lock(priv, flags);
794 
795 	usbhsg_status_set(gpriv, status);
796 	if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
797 	      usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
798 		ret = -1; /* not ready */
799 
800 	usbhs_unlock(priv, flags);
801 	/********************  spin unlock ********************/
802 
803 	if (ret < 0)
804 		return 0; /* not ready is not error */
805 
806 	/*
807 	 * enable interrupt and systems if ready
808 	 */
809 	dev_dbg(dev, "start gadget\n");
810 
811 	/*
812 	 * pipe initialize and enable DCP
813 	 */
814 	usbhs_fifo_init(priv);
815 	usbhs_pipe_init(priv,
816 			usbhsg_dma_map_ctrl);
817 
818 	/* dcp init instead of usbhsg_ep_enable() */
819 	dcp->pipe		= usbhs_dcp_malloc(priv);
820 	dcp->pipe->mod_private	= dcp;
821 	usbhs_pipe_config_update(dcp->pipe, 0, 0, 64);
822 
823 	/*
824 	 * system config enble
825 	 * - HI speed
826 	 * - function
827 	 * - usb module
828 	 */
829 	usbhs_sys_function_ctrl(priv, 1);
830 	usbhsg_update_pullup(priv);
831 
832 	/*
833 	 * enable irq callback
834 	 */
835 	mod->irq_dev_state	= usbhsg_irq_dev_state;
836 	mod->irq_ctrl_stage	= usbhsg_irq_ctrl_stage;
837 	usbhs_irq_callback_update(priv, mod);
838 
839 	return 0;
840 }
841 
842 static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
843 {
844 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
845 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
846 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
847 	struct device *dev = usbhs_priv_to_dev(priv);
848 	unsigned long flags;
849 	int ret = 0;
850 
851 	/********************  spin lock ********************/
852 	usbhs_lock(priv, flags);
853 
854 	usbhsg_status_clr(gpriv, status);
855 	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
856 	    !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
857 		ret = -1; /* already done */
858 
859 	usbhs_unlock(priv, flags);
860 	/********************  spin unlock ********************/
861 
862 	if (ret < 0)
863 		return 0; /* already done is not error */
864 
865 	/*
866 	 * disable interrupt and systems if 1st try
867 	 */
868 	usbhs_fifo_quit(priv);
869 
870 	/* disable all irq */
871 	mod->irq_dev_state	= NULL;
872 	mod->irq_ctrl_stage	= NULL;
873 	usbhs_irq_callback_update(priv, mod);
874 
875 	gpriv->gadget.speed = USB_SPEED_UNKNOWN;
876 
877 	/* disable sys */
878 	usbhs_sys_set_test_mode(priv, 0);
879 	usbhs_sys_function_ctrl(priv, 0);
880 
881 	usbhsg_ep_disable(&dcp->ep);
882 
883 	dev_dbg(dev, "stop gadget\n");
884 
885 	return 0;
886 }
887 
888 /*
889  * VBUS provided by the PHY
890  */
891 static int usbhsm_phy_get_vbus(struct platform_device *pdev)
892 {
893 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
894 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
895 
896 	return  gpriv->vbus_active;
897 }
898 
899 static void usbhs_mod_phy_mode(struct usbhs_priv *priv)
900 {
901 	struct usbhs_mod_info *info = &priv->mod_info;
902 
903 	info->irq_vbus		= NULL;
904 	priv->pfunc.get_vbus	= usbhsm_phy_get_vbus;
905 
906 	usbhs_irq_callback_update(priv, NULL);
907 }
908 
909 /*
910  *
911  *		linux usb function
912  *
913  */
914 static int usbhsg_gadget_start(struct usb_gadget *gadget,
915 		struct usb_gadget_driver *driver)
916 {
917 	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
918 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
919 	struct device *dev = usbhs_priv_to_dev(priv);
920 	int ret;
921 
922 	if (!driver		||
923 	    !driver->setup	||
924 	    driver->max_speed < USB_SPEED_FULL)
925 		return -EINVAL;
926 
927 	/* connect to bus through transceiver */
928 	if (!IS_ERR_OR_NULL(gpriv->transceiver)) {
929 		ret = otg_set_peripheral(gpriv->transceiver->otg,
930 					&gpriv->gadget);
931 		if (ret) {
932 			dev_err(dev, "%s: can't bind to transceiver\n",
933 				gpriv->gadget.name);
934 			return ret;
935 		}
936 
937 		/* get vbus using phy versions */
938 		usbhs_mod_phy_mode(priv);
939 	}
940 
941 	/* first hook up the driver ... */
942 	gpriv->driver = driver;
943 
944 	return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
945 }
946 
947 static int usbhsg_gadget_stop(struct usb_gadget *gadget)
948 {
949 	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
950 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
951 
952 	usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
953 
954 	if (!IS_ERR_OR_NULL(gpriv->transceiver))
955 		otg_set_peripheral(gpriv->transceiver->otg, NULL);
956 
957 	gpriv->driver = NULL;
958 
959 	return 0;
960 }
961 
962 /*
963  *		usb gadget ops
964  */
965 static int usbhsg_get_frame(struct usb_gadget *gadget)
966 {
967 	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
968 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
969 
970 	return usbhs_frame_get_num(priv);
971 }
972 
973 static int usbhsg_pullup(struct usb_gadget *gadget, int is_on)
974 {
975 	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
976 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
977 	unsigned long flags;
978 
979 	usbhs_lock(priv, flags);
980 	if (is_on)
981 		usbhsg_status_set(gpriv, USBHSG_STATUS_SOFT_CONNECT);
982 	else
983 		usbhsg_status_clr(gpriv, USBHSG_STATUS_SOFT_CONNECT);
984 	usbhsg_update_pullup(priv);
985 	usbhs_unlock(priv, flags);
986 
987 	return 0;
988 }
989 
990 static int usbhsg_set_selfpowered(struct usb_gadget *gadget, int is_self)
991 {
992 	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
993 
994 	if (is_self)
995 		usbhsg_status_set(gpriv, USBHSG_STATUS_SELF_POWERED);
996 	else
997 		usbhsg_status_clr(gpriv, USBHSG_STATUS_SELF_POWERED);
998 
999 	gadget->is_selfpowered = (is_self != 0);
1000 
1001 	return 0;
1002 }
1003 
1004 static int usbhsg_vbus_session(struct usb_gadget *gadget, int is_active)
1005 {
1006 	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
1007 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
1008 	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
1009 
1010 	gpriv->vbus_active = !!is_active;
1011 
1012 	renesas_usbhs_call_notify_hotplug(pdev);
1013 
1014 	return 0;
1015 }
1016 
1017 static const struct usb_gadget_ops usbhsg_gadget_ops = {
1018 	.get_frame		= usbhsg_get_frame,
1019 	.set_selfpowered	= usbhsg_set_selfpowered,
1020 	.udc_start		= usbhsg_gadget_start,
1021 	.udc_stop		= usbhsg_gadget_stop,
1022 	.pullup			= usbhsg_pullup,
1023 	.vbus_session		= usbhsg_vbus_session,
1024 };
1025 
1026 static int usbhsg_start(struct usbhs_priv *priv)
1027 {
1028 	return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
1029 }
1030 
1031 static int usbhsg_stop(struct usbhs_priv *priv)
1032 {
1033 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1034 
1035 	/* cable disconnect */
1036 	if (gpriv->driver &&
1037 	    gpriv->driver->disconnect)
1038 		gpriv->driver->disconnect(&gpriv->gadget);
1039 
1040 	return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
1041 }
1042 
1043 int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
1044 {
1045 	struct usbhsg_gpriv *gpriv;
1046 	struct usbhsg_uep *uep;
1047 	struct device *dev = usbhs_priv_to_dev(priv);
1048 	struct renesas_usbhs_driver_pipe_config *pipe_configs =
1049 					usbhs_get_dparam(priv, pipe_configs);
1050 	int pipe_size = usbhs_get_dparam(priv, pipe_size);
1051 	int i;
1052 	int ret;
1053 
1054 	gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
1055 	if (!gpriv) {
1056 		dev_err(dev, "Could not allocate gadget priv\n");
1057 		return -ENOMEM;
1058 	}
1059 
1060 	uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
1061 	if (!uep) {
1062 		dev_err(dev, "Could not allocate ep\n");
1063 		ret = -ENOMEM;
1064 		goto usbhs_mod_gadget_probe_err_gpriv;
1065 	}
1066 
1067 	gpriv->transceiver = usb_get_phy(USB_PHY_TYPE_UNDEFINED);
1068 	dev_info(dev, "%stransceiver found\n",
1069 		 gpriv->transceiver ? "" : "no ");
1070 
1071 	/*
1072 	 * CAUTION
1073 	 *
1074 	 * There is no guarantee that it is possible to access usb module here.
1075 	 * Don't accesses to it.
1076 	 * The accesse will be enable after "usbhsg_start"
1077 	 */
1078 
1079 	/*
1080 	 * register itself
1081 	 */
1082 	usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
1083 
1084 	/* init gpriv */
1085 	gpriv->mod.name		= "gadget";
1086 	gpriv->mod.start	= usbhsg_start;
1087 	gpriv->mod.stop		= usbhsg_stop;
1088 	gpriv->uep		= uep;
1089 	gpriv->uep_size		= pipe_size;
1090 	usbhsg_status_init(gpriv);
1091 
1092 	/*
1093 	 * init gadget
1094 	 */
1095 	gpriv->gadget.dev.parent	= dev;
1096 	gpriv->gadget.name		= "renesas_usbhs_udc";
1097 	gpriv->gadget.ops		= &usbhsg_gadget_ops;
1098 	gpriv->gadget.max_speed		= USB_SPEED_HIGH;
1099 
1100 	INIT_LIST_HEAD(&gpriv->gadget.ep_list);
1101 
1102 	/*
1103 	 * init usb_ep
1104 	 */
1105 	usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
1106 		uep->gpriv	= gpriv;
1107 		uep->pipe	= NULL;
1108 		snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
1109 
1110 		uep->ep.name		= uep->ep_name;
1111 		uep->ep.ops		= &usbhsg_ep_ops;
1112 		INIT_LIST_HEAD(&uep->ep.ep_list);
1113 
1114 		/* init DCP */
1115 		if (usbhsg_is_dcp(uep)) {
1116 			gpriv->gadget.ep0 = &uep->ep;
1117 			usb_ep_set_maxpacket_limit(&uep->ep, 64);
1118 			uep->ep.caps.type_control = true;
1119 		} else {
1120 			/* init normal pipe */
1121 			if (pipe_configs[i].type == USB_ENDPOINT_XFER_ISOC)
1122 				uep->ep.caps.type_iso = true;
1123 			if (pipe_configs[i].type == USB_ENDPOINT_XFER_BULK)
1124 				uep->ep.caps.type_bulk = true;
1125 			if (pipe_configs[i].type == USB_ENDPOINT_XFER_INT)
1126 				uep->ep.caps.type_int = true;
1127 			usb_ep_set_maxpacket_limit(&uep->ep,
1128 						   pipe_configs[i].bufsize);
1129 			list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
1130 		}
1131 		uep->ep.caps.dir_in = true;
1132 		uep->ep.caps.dir_out = true;
1133 	}
1134 
1135 	ret = usb_add_gadget_udc(dev, &gpriv->gadget);
1136 	if (ret)
1137 		goto err_add_udc;
1138 
1139 
1140 	dev_info(dev, "gadget probed\n");
1141 
1142 	return 0;
1143 
1144 err_add_udc:
1145 	kfree(gpriv->uep);
1146 
1147 usbhs_mod_gadget_probe_err_gpriv:
1148 	kfree(gpriv);
1149 
1150 	return ret;
1151 }
1152 
1153 void usbhs_mod_gadget_remove(struct usbhs_priv *priv)
1154 {
1155 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1156 
1157 	usb_del_gadget_udc(&gpriv->gadget);
1158 
1159 	kfree(gpriv->uep);
1160 	kfree(gpriv);
1161 }
1162