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/drivers/usb/renesas_usbhs/mod_gadget.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 976 lines | 649 code | 186 blank | 141 comment | 53 complexity | af090e913977dd896f8da2fb0d21d9e9 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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/dma-mapping.h>
 18#include <linux/io.h>
 19#include <linux/module.h>
 20#include <linux/platform_device.h>
 21#include <linux/usb/ch9.h>
 22#include <linux/usb/gadget.h>
 23#include "common.h"
 24
 25/*
 26 *		struct
 27 */
 28struct usbhsg_request {
 29	struct usb_request	req;
 30	struct usbhs_pkt	pkt;
 31};
 32
 33#define EP_NAME_SIZE 8
 34struct usbhsg_gpriv;
 35struct usbhsg_uep {
 36	struct usb_ep		 ep;
 37	struct usbhs_pipe	*pipe;
 38
 39	char ep_name[EP_NAME_SIZE];
 40
 41	struct usbhsg_gpriv *gpriv;
 42	struct usbhs_pkt_handle *handler;
 43};
 44
 45struct usbhsg_gpriv {
 46	struct usb_gadget	 gadget;
 47	struct usbhs_mod	 mod;
 48	struct list_head	 link;
 49
 50	struct usbhsg_uep	*uep;
 51	int			 uep_size;
 52
 53	struct usb_gadget_driver	*driver;
 54
 55	u32	status;
 56#define USBHSG_STATUS_STARTED		(1 << 0)
 57#define USBHSG_STATUS_REGISTERD		(1 << 1)
 58#define USBHSG_STATUS_WEDGE		(1 << 2)
 59};
 60
 61struct usbhsg_recip_handle {
 62	char *name;
 63	int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 64		      struct usb_ctrlrequest *ctrl);
 65	int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 66			 struct usb_ctrlrequest *ctrl);
 67	int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 68			struct usb_ctrlrequest *ctrl);
 69};
 70
 71/*
 72 *		macro
 73 */
 74#define usbhsg_priv_to_gpriv(priv)			\
 75	container_of(					\
 76		usbhs_mod_get(priv, USBHS_GADGET),	\
 77		struct usbhsg_gpriv, mod)
 78
 79#define __usbhsg_for_each_uep(start, pos, g, i)	\
 80	for (i = start, pos = (g)->uep + i;	\
 81	     i < (g)->uep_size;			\
 82	     i++, pos = (g)->uep + i)
 83
 84#define usbhsg_for_each_uep(pos, gpriv, i)	\
 85	__usbhsg_for_each_uep(1, pos, gpriv, i)
 86
 87#define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)	\
 88	__usbhsg_for_each_uep(0, pos, gpriv, i)
 89
 90#define usbhsg_gadget_to_gpriv(g)\
 91	container_of(g, struct usbhsg_gpriv, gadget)
 92
 93#define usbhsg_req_to_ureq(r)\
 94	container_of(r, struct usbhsg_request, req)
 95
 96#define usbhsg_ep_to_uep(e)		container_of(e, struct usbhsg_uep, ep)
 97#define usbhsg_gpriv_to_dev(gp)		usbhs_priv_to_dev((gp)->mod.priv)
 98#define usbhsg_gpriv_to_priv(gp)	((gp)->mod.priv)
 99#define usbhsg_gpriv_to_dcp(gp)		((gp)->uep)
100#define usbhsg_gpriv_to_nth_uep(gp, i)	((gp)->uep + i)
101#define usbhsg_uep_to_gpriv(u)		((u)->gpriv)
102#define usbhsg_uep_to_pipe(u)		((u)->pipe)
103#define usbhsg_pipe_to_uep(p)		((p)->mod_private)
104#define usbhsg_is_dcp(u)		((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
105
106#define usbhsg_ureq_to_pkt(u)		(&(u)->pkt)
107#define usbhsg_pkt_to_ureq(i)	\
108	container_of(i, struct usbhsg_request, pkt)
109
110#define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
111
112/* status */
113#define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
114#define usbhsg_status_set(gp, b) (gp->status |=  b)
115#define usbhsg_status_clr(gp, b) (gp->status &= ~b)
116#define usbhsg_status_has(gp, b) (gp->status &   b)
117
118/* controller */
119LIST_HEAD(the_controller_link);
120
121#define usbhsg_for_each_controller(gpriv)\
122	list_for_each_entry(gpriv, &the_controller_link, link)
123#define usbhsg_controller_register(gpriv)\
124	list_add_tail(&(gpriv)->link, &the_controller_link)
125#define usbhsg_controller_unregister(gpriv)\
126	list_del_init(&(gpriv)->link)
127
128/*
129 *		queue push/pop
130 */
131static void usbhsg_queue_push(struct usbhsg_uep *uep,
132			      struct usbhsg_request *ureq)
133{
134	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
135	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
136	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
137	struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
138	struct usb_request *req = &ureq->req;
139
140	req->actual = 0;
141	req->status = -EINPROGRESS;
142	usbhs_pkt_push(pipe, pkt, uep->handler,
143		       req->buf, req->length, req->zero);
144
145	dev_dbg(dev, "pipe %d : queue push (%d)\n",
146		usbhs_pipe_number(pipe),
147		req->length);
148}
149
150static void usbhsg_queue_pop(struct usbhsg_uep *uep,
151			     struct usbhsg_request *ureq,
152			     int status)
153{
154	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
155	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
156	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
157
158	dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
159
160	ureq->req.status = status;
161	ureq->req.complete(&uep->ep, &ureq->req);
162}
163
164static void usbhsg_queue_done(struct usbhs_pkt *pkt)
165{
166	struct usbhs_pipe *pipe = pkt->pipe;
167	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
168	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
169
170	ureq->req.actual = pkt->actual;
171
172	usbhsg_queue_pop(uep, ureq, 0);
173}
174
175/*
176 *		dma map/unmap
177 */
178static int usbhsg_dma_map(struct device *dev,
179			  struct usbhs_pkt *pkt,
180			  enum dma_data_direction dir)
181{
182	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
183	struct usb_request *req = &ureq->req;
184
185	if (pkt->dma != DMA_ADDR_INVALID) {
186		dev_err(dev, "dma is already mapped\n");
187		return -EIO;
188	}
189
190	if (req->dma == DMA_ADDR_INVALID) {
191		pkt->dma = dma_map_single(dev, pkt->buf, pkt->length, dir);
192	} else {
193		dma_sync_single_for_device(dev, req->dma, req->length, dir);
194		pkt->dma = req->dma;
195	}
196
197	if (dma_mapping_error(dev, pkt->dma)) {
198		dev_err(dev, "dma mapping error %x\n", pkt->dma);
199		return -EIO;
200	}
201
202	return 0;
203}
204
205static int usbhsg_dma_unmap(struct device *dev,
206			    struct usbhs_pkt *pkt,
207			    enum dma_data_direction dir)
208{
209	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
210	struct usb_request *req = &ureq->req;
211
212	if (pkt->dma == DMA_ADDR_INVALID) {
213		dev_err(dev, "dma is not mapped\n");
214		return -EIO;
215	}
216
217	if (req->dma == DMA_ADDR_INVALID)
218		dma_unmap_single(dev, pkt->dma, pkt->length, dir);
219	else
220		dma_sync_single_for_cpu(dev, req->dma, req->length, dir);
221
222	pkt->dma = DMA_ADDR_INVALID;
223
224	return 0;
225}
226
227static int usbhsg_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
228{
229	struct usbhs_pipe *pipe = pkt->pipe;
230	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
231	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
232	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
233	enum dma_data_direction dir;
234
235	dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
236
237	if (map)
238		return usbhsg_dma_map(dev, pkt, dir);
239	else
240		return usbhsg_dma_unmap(dev, pkt, dir);
241}
242
243/*
244 *		USB_TYPE_STANDARD / clear feature functions
245 */
246static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
247						 struct usbhsg_uep *uep,
248						 struct usb_ctrlrequest *ctrl)
249{
250	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
251	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
252	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
253
254	usbhs_dcp_control_transfer_done(pipe);
255
256	return 0;
257}
258
259static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
260						   struct usbhsg_uep *uep,
261						   struct usb_ctrlrequest *ctrl)
262{
263	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
264	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
265
266	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
267		usbhs_pipe_disable(pipe);
268		usbhs_pipe_clear_sequence(pipe);
269		usbhs_pipe_enable(pipe);
270	}
271
272	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
273
274	return 0;
275}
276
277struct usbhsg_recip_handle req_clear_feature = {
278	.name		= "clear feature",
279	.device		= usbhsg_recip_handler_std_control_done,
280	.interface	= usbhsg_recip_handler_std_control_done,
281	.endpoint	= usbhsg_recip_handler_std_clear_endpoint,
282};
283
284/*
285 *		USB_TYPE handler
286 */
287static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
288				   struct usbhsg_recip_handle *handler,
289				   struct usb_ctrlrequest *ctrl)
290{
291	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
292	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
293	struct usbhsg_uep *uep;
294	struct usbhs_pipe *pipe;
295	int recip = ctrl->bRequestType & USB_RECIP_MASK;
296	int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
297	int ret;
298	int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
299		    struct usb_ctrlrequest *ctrl);
300	char *msg;
301
302	uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
303	pipe = usbhsg_uep_to_pipe(uep);
304	if (!pipe) {
305		dev_err(dev, "wrong recip request\n");
306		ret = -EINVAL;
307		goto usbhsg_recip_run_handle_end;
308	}
309
310	switch (recip) {
311	case USB_RECIP_DEVICE:
312		msg	= "DEVICE";
313		func	= handler->device;
314		break;
315	case USB_RECIP_INTERFACE:
316		msg	= "INTERFACE";
317		func	= handler->interface;
318		break;
319	case USB_RECIP_ENDPOINT:
320		msg	= "ENDPOINT";
321		func	= handler->endpoint;
322		break;
323	default:
324		dev_warn(dev, "unsupported RECIP(%d)\n", recip);
325		func = NULL;
326		ret = -EINVAL;
327	}
328
329	if (func) {
330		unsigned long flags;
331
332		dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
333
334		/********************  spin lock ********************/
335		usbhs_lock(priv, flags);
336		ret = func(priv, uep, ctrl);
337		usbhs_unlock(priv, flags);
338		/********************  spin unlock ******************/
339	}
340
341usbhsg_recip_run_handle_end:
342	usbhs_pkt_start(pipe);
343
344	return ret;
345}
346
347/*
348 *		irq functions
349 *
350 * it will be called from usbhs_interrupt
351 */
352static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
353				struct usbhs_irq_state *irq_state)
354{
355	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
356	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
357
358	gpriv->gadget.speed = usbhs_status_get_usb_speed(irq_state);
359
360	dev_dbg(dev, "state = %x : speed : %d\n",
361		usbhs_status_get_device_state(irq_state),
362		gpriv->gadget.speed);
363
364	return 0;
365}
366
367static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
368				 struct usbhs_irq_state *irq_state)
369{
370	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
371	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
372	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
373	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
374	struct usb_ctrlrequest ctrl;
375	struct usbhsg_recip_handle *recip_handler = NULL;
376	int stage = usbhs_status_get_ctrl_stage(irq_state);
377	int ret = 0;
378
379	dev_dbg(dev, "stage = %d\n", stage);
380
381	/*
382	 * see Manual
383	 *
384	 *  "Operation"
385	 *  - "Interrupt Function"
386	 *    - "Control Transfer Stage Transition Interrupt"
387	 *      - Fig. "Control Transfer Stage Transitions"
388	 */
389
390	switch (stage) {
391	case READ_DATA_STAGE:
392		dcp->handler = &usbhs_fifo_pio_push_handler;
393		break;
394	case WRITE_DATA_STAGE:
395		dcp->handler = &usbhs_fifo_pio_pop_handler;
396		break;
397	case NODATA_STATUS_STAGE:
398		dcp->handler = &usbhs_ctrl_stage_end_handler;
399		break;
400	default:
401		return ret;
402	}
403
404	/*
405	 * get usb request
406	 */
407	usbhs_usbreq_get_val(priv, &ctrl);
408
409	switch (ctrl.bRequestType & USB_TYPE_MASK) {
410	case USB_TYPE_STANDARD:
411		switch (ctrl.bRequest) {
412		case USB_REQ_CLEAR_FEATURE:
413			recip_handler = &req_clear_feature;
414			break;
415		}
416	}
417
418	/*
419	 * setup stage / run recip
420	 */
421	if (recip_handler)
422		ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
423	else
424		ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
425
426	if (ret < 0)
427		usbhs_pipe_stall(pipe);
428
429	return ret;
430}
431
432/*
433 *
434 *		usb_dcp_ops
435 *
436 */
437static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
438{
439	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
440	struct usbhs_pkt *pkt;
441
442	usbhs_pipe_disable(pipe);
443
444	while (1) {
445		pkt = usbhs_pkt_pop(pipe, NULL);
446		if (!pkt)
447			break;
448	}
449
450	return 0;
451}
452
453static void usbhsg_uep_init(struct usbhsg_gpriv *gpriv)
454{
455	int i;
456	struct usbhsg_uep *uep;
457
458	usbhsg_for_each_uep_with_dcp(uep, gpriv, i)
459		uep->pipe = NULL;
460}
461
462/*
463 *
464 *		usb_ep_ops
465 *
466 */
467static int usbhsg_ep_enable(struct usb_ep *ep,
468			 const struct usb_endpoint_descriptor *desc)
469{
470	struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
471	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
472	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
473	struct usbhs_pipe *pipe;
474	int ret = -EIO;
475
476	/*
477	 * if it already have pipe,
478	 * nothing to do
479	 */
480	if (uep->pipe) {
481		usbhs_pipe_clear(uep->pipe);
482		usbhs_pipe_clear_sequence(uep->pipe);
483		return 0;
484	}
485
486	pipe = usbhs_pipe_malloc(priv, desc);
487	if (pipe) {
488		uep->pipe		= pipe;
489		pipe->mod_private	= uep;
490
491		/*
492		 * usbhs_fifo_dma_push/pop_handler try to
493		 * use dmaengine if possible.
494		 * It will use pio handler if impossible.
495		 */
496		if (usb_endpoint_dir_in(desc))
497			uep->handler = &usbhs_fifo_dma_push_handler;
498		else
499			uep->handler = &usbhs_fifo_dma_pop_handler;
500
501		ret = 0;
502	}
503
504	return ret;
505}
506
507static int usbhsg_ep_disable(struct usb_ep *ep)
508{
509	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
510
511	return usbhsg_pipe_disable(uep);
512}
513
514static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
515						   gfp_t gfp_flags)
516{
517	struct usbhsg_request *ureq;
518
519	ureq = kzalloc(sizeof *ureq, gfp_flags);
520	if (!ureq)
521		return NULL;
522
523	usbhs_pkt_init(usbhsg_ureq_to_pkt(ureq));
524
525	ureq->req.dma = DMA_ADDR_INVALID;
526
527	return &ureq->req;
528}
529
530static void usbhsg_ep_free_request(struct usb_ep *ep,
531				   struct usb_request *req)
532{
533	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
534
535	WARN_ON(!list_empty(&ureq->pkt.node));
536	kfree(ureq);
537}
538
539static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
540			  gfp_t gfp_flags)
541{
542	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
543	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
544	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
545	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
546
547	/* param check */
548	if (usbhsg_is_not_connected(gpriv)	||
549	    unlikely(!gpriv->driver)		||
550	    unlikely(!pipe))
551		return -ESHUTDOWN;
552
553	usbhsg_queue_push(uep, ureq);
554
555	return 0;
556}
557
558static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
559{
560	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
561	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
562	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
563
564	usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
565	usbhsg_queue_pop(uep, ureq, -ECONNRESET);
566
567	return 0;
568}
569
570static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
571{
572	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
573	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
574	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
575	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
576	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
577	unsigned long flags;
578
579	usbhsg_pipe_disable(uep);
580
581	dev_dbg(dev, "set halt %d (pipe %d)\n",
582		halt, usbhs_pipe_number(pipe));
583
584	/********************  spin lock ********************/
585	usbhs_lock(priv, flags);
586
587	if (halt)
588		usbhs_pipe_stall(pipe);
589	else
590		usbhs_pipe_disable(pipe);
591
592	if (halt && wedge)
593		usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
594	else
595		usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
596
597	usbhs_unlock(priv, flags);
598	/********************  spin unlock ******************/
599
600	return 0;
601}
602
603static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
604{
605	return __usbhsg_ep_set_halt_wedge(ep, value, 0);
606}
607
608static int usbhsg_ep_set_wedge(struct usb_ep *ep)
609{
610	return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
611}
612
613static struct usb_ep_ops usbhsg_ep_ops = {
614	.enable		= usbhsg_ep_enable,
615	.disable	= usbhsg_ep_disable,
616
617	.alloc_request	= usbhsg_ep_alloc_request,
618	.free_request	= usbhsg_ep_free_request,
619
620	.queue		= usbhsg_ep_queue,
621	.dequeue	= usbhsg_ep_dequeue,
622
623	.set_halt	= usbhsg_ep_set_halt,
624	.set_wedge	= usbhsg_ep_set_wedge,
625};
626
627/*
628 *		usb module start/end
629 */
630static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
631{
632	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
633	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
634	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
635	struct device *dev = usbhs_priv_to_dev(priv);
636	unsigned long flags;
637	int ret = 0;
638
639	/********************  spin lock ********************/
640	usbhs_lock(priv, flags);
641
642	usbhsg_status_set(gpriv, status);
643	if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
644	      usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
645		ret = -1; /* not ready */
646
647	usbhs_unlock(priv, flags);
648	/********************  spin unlock ********************/
649
650	if (ret < 0)
651		return 0; /* not ready is not error */
652
653	/*
654	 * enable interrupt and systems if ready
655	 */
656	dev_dbg(dev, "start gadget\n");
657
658	/*
659	 * pipe initialize and enable DCP
660	 */
661	usbhs_pipe_init(priv,
662			usbhsg_queue_done,
663			usbhsg_dma_map_ctrl);
664	usbhs_fifo_init(priv);
665	usbhsg_uep_init(gpriv);
666
667	/* dcp init */
668	dcp->pipe		= usbhs_dcp_malloc(priv);
669	dcp->pipe->mod_private	= dcp;
670
671	/*
672	 * system config enble
673	 * - HI speed
674	 * - function
675	 * - usb module
676	 */
677	usbhs_sys_hispeed_ctrl(priv, 1);
678	usbhs_sys_function_ctrl(priv, 1);
679	usbhs_sys_usb_ctrl(priv, 1);
680
681	/*
682	 * enable irq callback
683	 */
684	mod->irq_dev_state	= usbhsg_irq_dev_state;
685	mod->irq_ctrl_stage	= usbhsg_irq_ctrl_stage;
686	usbhs_irq_callback_update(priv, mod);
687
688	return 0;
689}
690
691static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
692{
693	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
694	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
695	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
696	struct device *dev = usbhs_priv_to_dev(priv);
697	unsigned long flags;
698	int ret = 0;
699
700	/********************  spin lock ********************/
701	usbhs_lock(priv, flags);
702
703	usbhsg_status_clr(gpriv, status);
704	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
705	    !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
706		ret = -1; /* already done */
707
708	usbhs_unlock(priv, flags);
709	/********************  spin unlock ********************/
710
711	if (ret < 0)
712		return 0; /* already done is not error */
713
714	/*
715	 * disable interrupt and systems if 1st try
716	 */
717	usbhs_fifo_quit(priv);
718
719	/* disable all irq */
720	mod->irq_dev_state	= NULL;
721	mod->irq_ctrl_stage	= NULL;
722	usbhs_irq_callback_update(priv, mod);
723
724	gpriv->gadget.speed = USB_SPEED_UNKNOWN;
725
726	/* disable sys */
727	usbhs_sys_hispeed_ctrl(priv, 0);
728	usbhs_sys_function_ctrl(priv, 0);
729	usbhs_sys_usb_ctrl(priv, 0);
730
731	usbhsg_pipe_disable(dcp);
732
733	if (gpriv->driver &&
734	    gpriv->driver->disconnect)
735		gpriv->driver->disconnect(&gpriv->gadget);
736
737	dev_dbg(dev, "stop gadget\n");
738
739	return 0;
740}
741
742/*
743 *
744 *		linux usb function
745 *
746 */
747static int usbhsg_gadget_start(struct usb_gadget_driver *driver,
748			    int (*bind)(struct usb_gadget *))
749{
750	struct usbhsg_gpriv *gpriv;
751	struct usbhs_priv *priv;
752	struct device *dev;
753	int ret;
754
755	if (!bind		||
756	    !driver		||
757	    !driver->setup	||
758	    driver->speed != USB_SPEED_HIGH)
759		return -EINVAL;
760
761	/*
762	 * find unused controller
763	 */
764	usbhsg_for_each_controller(gpriv) {
765		if (!gpriv->driver)
766			goto find_unused_controller;
767	}
768	return -ENODEV;
769
770find_unused_controller:
771
772	dev  = usbhsg_gpriv_to_dev(gpriv);
773	priv = usbhsg_gpriv_to_priv(gpriv);
774
775	/* first hook up the driver ... */
776	gpriv->driver = driver;
777	gpriv->gadget.dev.driver = &driver->driver;
778
779	ret = device_add(&gpriv->gadget.dev);
780	if (ret) {
781		dev_err(dev, "device_add error %d\n", ret);
782		goto add_fail;
783	}
784
785	ret = bind(&gpriv->gadget);
786	if (ret) {
787		dev_err(dev, "bind to driver %s error %d\n",
788			driver->driver.name, ret);
789		goto bind_fail;
790	}
791
792	dev_dbg(dev, "bind %s\n", driver->driver.name);
793
794	return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
795
796bind_fail:
797	device_del(&gpriv->gadget.dev);
798add_fail:
799	gpriv->driver = NULL;
800	gpriv->gadget.dev.driver = NULL;
801
802	return ret;
803}
804
805static int usbhsg_gadget_stop(struct usb_gadget_driver *driver)
806{
807	struct usbhsg_gpriv *gpriv;
808	struct usbhs_priv *priv;
809	struct device *dev;
810
811	if (!driver		||
812	    !driver->unbind)
813		return -EINVAL;
814
815	/*
816	 * find controller
817	 */
818	usbhsg_for_each_controller(gpriv) {
819		if (gpriv->driver == driver)
820			goto find_matching_controller;
821	}
822	return -ENODEV;
823
824find_matching_controller:
825
826	dev  = usbhsg_gpriv_to_dev(gpriv);
827	priv = usbhsg_gpriv_to_priv(gpriv);
828
829	usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
830	device_del(&gpriv->gadget.dev);
831	gpriv->driver = NULL;
832
833	if (driver->disconnect)
834		driver->disconnect(&gpriv->gadget);
835
836	driver->unbind(&gpriv->gadget);
837	dev_dbg(dev, "unbind %s\n", driver->driver.name);
838
839	return 0;
840}
841
842/*
843 *		usb gadget ops
844 */
845static int usbhsg_get_frame(struct usb_gadget *gadget)
846{
847	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
848	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
849
850	return usbhs_frame_get_num(priv);
851}
852
853static struct usb_gadget_ops usbhsg_gadget_ops = {
854	.get_frame		= usbhsg_get_frame,
855	.start			= usbhsg_gadget_start,
856	.stop			= usbhsg_gadget_stop,
857};
858
859static int usbhsg_start(struct usbhs_priv *priv)
860{
861	return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
862}
863
864static int usbhsg_stop(struct usbhs_priv *priv)
865{
866	return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
867}
868
869int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv)
870{
871	struct usbhsg_gpriv *gpriv;
872	struct usbhsg_uep *uep;
873	struct device *dev = usbhs_priv_to_dev(priv);
874	int pipe_size = usbhs_get_dparam(priv, pipe_size);
875	int i;
876	int ret;
877
878	gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
879	if (!gpriv) {
880		dev_err(dev, "Could not allocate gadget priv\n");
881		return -ENOMEM;
882	}
883
884	uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
885	if (!uep) {
886		dev_err(dev, "Could not allocate ep\n");
887		ret = -ENOMEM;
888		goto usbhs_mod_gadget_probe_err_gpriv;
889	}
890
891	/*
892	 * CAUTION
893	 *
894	 * There is no guarantee that it is possible to access usb module here.
895	 * Don't accesses to it.
896	 * The accesse will be enable after "usbhsg_start"
897	 */
898
899	/*
900	 * register itself
901	 */
902	usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
903
904	/* init gpriv */
905	gpriv->mod.name		= "gadget";
906	gpriv->mod.start	= usbhsg_start;
907	gpriv->mod.stop		= usbhsg_stop;
908	gpriv->uep		= uep;
909	gpriv->uep_size		= pipe_size;
910	usbhsg_status_init(gpriv);
911
912	/*
913	 * init gadget
914	 */
915	device_initialize(&gpriv->gadget.dev);
916	dev_set_name(&gpriv->gadget.dev, "gadget");
917	gpriv->gadget.dev.parent	= dev;
918	gpriv->gadget.name		= "renesas_usbhs_udc";
919	gpriv->gadget.ops		= &usbhsg_gadget_ops;
920	gpriv->gadget.is_dualspeed	= 1;
921
922	INIT_LIST_HEAD(&gpriv->gadget.ep_list);
923
924	/*
925	 * init usb_ep
926	 */
927	usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
928		uep->gpriv	= gpriv;
929		snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
930
931		uep->ep.name		= uep->ep_name;
932		uep->ep.ops		= &usbhsg_ep_ops;
933		INIT_LIST_HEAD(&uep->ep.ep_list);
934
935		/* init DCP */
936		if (usbhsg_is_dcp(uep)) {
937			gpriv->gadget.ep0 = &uep->ep;
938			uep->ep.maxpacket = 64;
939		}
940		/* init normal pipe */
941		else {
942			uep->ep.maxpacket = 512;
943			list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
944		}
945	}
946
947	usbhsg_controller_register(gpriv);
948
949	ret = usb_add_gadget_udc(dev, &gpriv->gadget);
950	if (ret)
951		goto err_add_udc;
952
953
954	dev_info(dev, "gadget probed\n");
955
956	return 0;
957err_add_udc:
958	kfree(gpriv->uep);
959
960usbhs_mod_gadget_probe_err_gpriv:
961	kfree(gpriv);
962
963	return ret;
964}
965
966void __devexit usbhs_mod_gadget_remove(struct usbhs_priv *priv)
967{
968	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
969
970	usb_del_gadget_udc(&gpriv->gadget);
971
972	usbhsg_controller_unregister(gpriv);
973
974	kfree(gpriv->uep);
975	kfree(gpriv);
976}