musb_gadget_ep0.c revision 5542bc2ac7b52c021fc9c7a96329955491b7e763
1/*
2 * MUSB OTG peripheral driver ep0 handling
3 *
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
7 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * 02110-1301 USA
22 *
23 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
26 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 */
35
36#include <linux/kernel.h>
37#include <linux/list.h>
38#include <linux/timer.h>
39#include <linux/spinlock.h>
40#include <linux/init.h>
41#include <linux/device.h>
42#include <linux/interrupt.h>
43
44#include "musb_core.h"
45
46/* ep0 is always musb->endpoints[0].ep_in */
47#define	next_ep0_request(musb)	next_in_request(&(musb)->endpoints[0])
48
49/*
50 * locking note:  we use only the controller lock, for simpler correctness.
51 * It's always held with IRQs blocked.
52 *
53 * It protects the ep0 request queue as well as ep0_state, not just the
54 * controller and indexed registers.  And that lock stays held unless it
55 * needs to be dropped to allow reentering this driver ... like upcalls to
56 * the gadget driver, or adjusting endpoint halt status.
57 */
58
59static char *decode_ep0stage(u8 stage)
60{
61	switch (stage) {
62	case MUSB_EP0_STAGE_IDLE:	return "idle";
63	case MUSB_EP0_STAGE_SETUP:	return "setup";
64	case MUSB_EP0_STAGE_TX:		return "in";
65	case MUSB_EP0_STAGE_RX:		return "out";
66	case MUSB_EP0_STAGE_ACKWAIT:	return "wait";
67	case MUSB_EP0_STAGE_STATUSIN:	return "in/status";
68	case MUSB_EP0_STAGE_STATUSOUT:	return "out/status";
69	default:			return "?";
70	}
71}
72
73/* handle a standard GET_STATUS request
74 * Context:  caller holds controller lock
75 */
76static int service_tx_status_request(
77	struct musb *musb,
78	const struct usb_ctrlrequest *ctrlrequest)
79{
80	void __iomem	*mbase = musb->mregs;
81	int handled = 1;
82	u8 result[2], epnum = 0;
83	const u8 recip = ctrlrequest->bRequestType & USB_RECIP_MASK;
84
85	result[1] = 0;
86
87	switch (recip) {
88	case USB_RECIP_DEVICE:
89		result[0] = musb->is_self_powered << USB_DEVICE_SELF_POWERED;
90		result[0] |= musb->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
91#ifdef CONFIG_USB_MUSB_OTG
92		if (musb->g.is_otg) {
93			result[0] |= musb->g.b_hnp_enable
94				<< USB_DEVICE_B_HNP_ENABLE;
95			result[0] |= musb->g.a_alt_hnp_support
96				<< USB_DEVICE_A_ALT_HNP_SUPPORT;
97			result[0] |= musb->g.a_hnp_support
98				<< USB_DEVICE_A_HNP_SUPPORT;
99		}
100#endif
101		break;
102
103	case USB_RECIP_INTERFACE:
104		result[0] = 0;
105		break;
106
107	case USB_RECIP_ENDPOINT: {
108		int		is_in;
109		struct musb_ep	*ep;
110		u16		tmp;
111		void __iomem	*regs;
112
113		epnum = (u8) ctrlrequest->wIndex;
114		if (!epnum) {
115			result[0] = 0;
116			break;
117		}
118
119		is_in = epnum & USB_DIR_IN;
120		if (is_in) {
121			epnum &= 0x0f;
122			ep = &musb->endpoints[epnum].ep_in;
123		} else {
124			ep = &musb->endpoints[epnum].ep_out;
125		}
126		regs = musb->endpoints[epnum].regs;
127
128		if (epnum >= MUSB_C_NUM_EPS || !ep->desc) {
129			handled = -EINVAL;
130			break;
131		}
132
133		musb_ep_select(mbase, epnum);
134		if (is_in)
135			tmp = musb_readw(regs, MUSB_TXCSR)
136						& MUSB_TXCSR_P_SENDSTALL;
137		else
138			tmp = musb_readw(regs, MUSB_RXCSR)
139						& MUSB_RXCSR_P_SENDSTALL;
140		musb_ep_select(mbase, 0);
141
142		result[0] = tmp ? 1 : 0;
143		} break;
144
145	default:
146		/* class, vendor, etc ... delegate */
147		handled = 0;
148		break;
149	}
150
151	/* fill up the fifo; caller updates csr0 */
152	if (handled > 0) {
153		u16	len = le16_to_cpu(ctrlrequest->wLength);
154
155		if (len > 2)
156			len = 2;
157		musb_write_fifo(&musb->endpoints[0], len, result);
158	}
159
160	return handled;
161}
162
163/*
164 * handle a control-IN request, the end0 buffer contains the current request
165 * that is supposed to be a standard control request. Assumes the fifo to
166 * be at least 2 bytes long.
167 *
168 * @return 0 if the request was NOT HANDLED,
169 * < 0 when error
170 * > 0 when the request is processed
171 *
172 * Context:  caller holds controller lock
173 */
174static int
175service_in_request(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest)
176{
177	int handled = 0;	/* not handled */
178
179	if ((ctrlrequest->bRequestType & USB_TYPE_MASK)
180			== USB_TYPE_STANDARD) {
181		switch (ctrlrequest->bRequest) {
182		case USB_REQ_GET_STATUS:
183			handled = service_tx_status_request(musb,
184					ctrlrequest);
185			break;
186
187		/* case USB_REQ_SYNC_FRAME: */
188
189		default:
190			break;
191		}
192	}
193	return handled;
194}
195
196/*
197 * Context:  caller holds controller lock
198 */
199static void musb_g_ep0_giveback(struct musb *musb, struct usb_request *req)
200{
201	musb_g_giveback(&musb->endpoints[0].ep_in, req, 0);
202	musb->ep0_state = MUSB_EP0_STAGE_SETUP;
203}
204
205/*
206 * Tries to start B-device HNP negotiation if enabled via sysfs
207 */
208static inline void musb_try_b_hnp_enable(struct musb *musb)
209{
210	void __iomem	*mbase = musb->mregs;
211	u8		devctl;
212
213	DBG(1, "HNP: Setting HR\n");
214	devctl = musb_readb(mbase, MUSB_DEVCTL);
215	musb_writeb(mbase, MUSB_DEVCTL, devctl | MUSB_DEVCTL_HR);
216}
217
218/*
219 * Handle all control requests with no DATA stage, including standard
220 * requests such as:
221 * USB_REQ_SET_CONFIGURATION, USB_REQ_SET_INTERFACE, unrecognized
222 *	always delegated to the gadget driver
223 * USB_REQ_SET_ADDRESS, USB_REQ_CLEAR_FEATURE, USB_REQ_SET_FEATURE
224 *	always handled here, except for class/vendor/... features
225 *
226 * Context:  caller holds controller lock
227 */
228static int
229service_zero_data_request(struct musb *musb,
230		struct usb_ctrlrequest *ctrlrequest)
231__releases(musb->lock)
232__acquires(musb->lock)
233{
234	int handled = -EINVAL;
235	void __iomem *mbase = musb->mregs;
236	const u8 recip = ctrlrequest->bRequestType & USB_RECIP_MASK;
237
238	/* the gadget driver handles everything except what we MUST handle */
239	if ((ctrlrequest->bRequestType & USB_TYPE_MASK)
240			== USB_TYPE_STANDARD) {
241		switch (ctrlrequest->bRequest) {
242		case USB_REQ_SET_ADDRESS:
243			/* change it after the status stage */
244			musb->set_address = true;
245			musb->address = (u8) (ctrlrequest->wValue & 0x7f);
246			handled = 1;
247			break;
248
249		case USB_REQ_CLEAR_FEATURE:
250			switch (recip) {
251			case USB_RECIP_DEVICE:
252				if (ctrlrequest->wValue
253						!= USB_DEVICE_REMOTE_WAKEUP)
254					break;
255				musb->may_wakeup = 0;
256				handled = 1;
257				break;
258			case USB_RECIP_INTERFACE:
259				break;
260			case USB_RECIP_ENDPOINT:{
261				const u8 num = ctrlrequest->wIndex & 0x0f;
262				struct musb_ep *musb_ep;
263
264				if (num == 0
265						|| num >= MUSB_C_NUM_EPS
266						|| ctrlrequest->wValue
267							!= USB_ENDPOINT_HALT)
268					break;
269
270				if (ctrlrequest->wIndex & USB_DIR_IN)
271					musb_ep = &musb->endpoints[num].ep_in;
272				else
273					musb_ep = &musb->endpoints[num].ep_out;
274				if (!musb_ep->desc)
275					break;
276
277				/* REVISIT do it directly, no locking games */
278				spin_unlock(&musb->lock);
279				musb_gadget_set_halt(&musb_ep->end_point, 0);
280				spin_lock(&musb->lock);
281
282				/* select ep0 again */
283				musb_ep_select(mbase, 0);
284				handled = 1;
285				} break;
286			default:
287				/* class, vendor, etc ... delegate */
288				handled = 0;
289				break;
290			}
291			break;
292
293		case USB_REQ_SET_FEATURE:
294			switch (recip) {
295			case USB_RECIP_DEVICE:
296				handled = 1;
297				switch (ctrlrequest->wValue) {
298				case USB_DEVICE_REMOTE_WAKEUP:
299					musb->may_wakeup = 1;
300					break;
301				case USB_DEVICE_TEST_MODE:
302					if (musb->g.speed != USB_SPEED_HIGH)
303						goto stall;
304					if (ctrlrequest->wIndex & 0xff)
305						goto stall;
306
307					switch (ctrlrequest->wIndex >> 8) {
308					case 1:
309						pr_debug("TEST_J\n");
310						/* TEST_J */
311						musb->test_mode_nr =
312							MUSB_TEST_J;
313						break;
314					case 2:
315						/* TEST_K */
316						pr_debug("TEST_K\n");
317						musb->test_mode_nr =
318							MUSB_TEST_K;
319						break;
320					case 3:
321						/* TEST_SE0_NAK */
322						pr_debug("TEST_SE0_NAK\n");
323						musb->test_mode_nr =
324							MUSB_TEST_SE0_NAK;
325						break;
326					case 4:
327						/* TEST_PACKET */
328						pr_debug("TEST_PACKET\n");
329						musb->test_mode_nr =
330							MUSB_TEST_PACKET;
331						break;
332					default:
333						goto stall;
334					}
335
336					/* enter test mode after irq */
337					if (handled > 0)
338						musb->test_mode = true;
339					break;
340#ifdef CONFIG_USB_MUSB_OTG
341				case USB_DEVICE_B_HNP_ENABLE:
342					if (!musb->g.is_otg)
343						goto stall;
344					musb->g.b_hnp_enable = 1;
345					musb_try_b_hnp_enable(musb);
346					break;
347				case USB_DEVICE_A_HNP_SUPPORT:
348					if (!musb->g.is_otg)
349						goto stall;
350					musb->g.a_hnp_support = 1;
351					break;
352				case USB_DEVICE_A_ALT_HNP_SUPPORT:
353					if (!musb->g.is_otg)
354						goto stall;
355					musb->g.a_alt_hnp_support = 1;
356					break;
357#endif
358stall:
359				default:
360					handled = -EINVAL;
361					break;
362				}
363				break;
364
365			case USB_RECIP_INTERFACE:
366				break;
367
368			case USB_RECIP_ENDPOINT:{
369				const u8		epnum =
370					ctrlrequest->wIndex & 0x0f;
371				struct musb_ep		*musb_ep;
372				struct musb_hw_ep	*ep;
373				void __iomem		*regs;
374				int			is_in;
375				u16			csr;
376
377				if (epnum == 0
378						|| epnum >= MUSB_C_NUM_EPS
379						|| ctrlrequest->wValue
380							!= USB_ENDPOINT_HALT)
381					break;
382
383				ep = musb->endpoints + epnum;
384				regs = ep->regs;
385				is_in = ctrlrequest->wIndex & USB_DIR_IN;
386				if (is_in)
387					musb_ep = &ep->ep_in;
388				else
389					musb_ep = &ep->ep_out;
390				if (!musb_ep->desc)
391					break;
392
393				musb_ep_select(mbase, epnum);
394				if (is_in) {
395					csr = musb_readw(regs,
396							MUSB_TXCSR);
397					if (csr & MUSB_TXCSR_FIFONOTEMPTY)
398						csr |= MUSB_TXCSR_FLUSHFIFO;
399					csr |= MUSB_TXCSR_P_SENDSTALL
400						| MUSB_TXCSR_CLRDATATOG
401						| MUSB_TXCSR_P_WZC_BITS;
402					musb_writew(regs, MUSB_TXCSR,
403							csr);
404				} else {
405					csr = musb_readw(regs,
406							MUSB_RXCSR);
407					csr |= MUSB_RXCSR_P_SENDSTALL
408						| MUSB_RXCSR_FLUSHFIFO
409						| MUSB_RXCSR_CLRDATATOG
410						| MUSB_RXCSR_P_WZC_BITS;
411					musb_writew(regs, MUSB_RXCSR,
412							csr);
413				}
414
415				/* select ep0 again */
416				musb_ep_select(mbase, 0);
417				handled = 1;
418				} break;
419
420			default:
421				/* class, vendor, etc ... delegate */
422				handled = 0;
423				break;
424			}
425			break;
426		default:
427			/* delegate SET_CONFIGURATION, etc */
428			handled = 0;
429		}
430	} else
431		handled = 0;
432	return handled;
433}
434
435/* we have an ep0out data packet
436 * Context:  caller holds controller lock
437 */
438static void ep0_rxstate(struct musb *musb)
439{
440	void __iomem		*regs = musb->control_ep->regs;
441	struct usb_request	*req;
442	u16			count, csr;
443
444	req = next_ep0_request(musb);
445
446	/* read packet and ack; or stall because of gadget driver bug:
447	 * should have provided the rx buffer before setup() returned.
448	 */
449	if (req) {
450		void		*buf = req->buf + req->actual;
451		unsigned	len = req->length - req->actual;
452
453		/* read the buffer */
454		count = musb_readb(regs, MUSB_COUNT0);
455		if (count > len) {
456			req->status = -EOVERFLOW;
457			count = len;
458		}
459		musb_read_fifo(&musb->endpoints[0], count, buf);
460		req->actual += count;
461		csr = MUSB_CSR0_P_SVDRXPKTRDY;
462		if (count < 64 || req->actual == req->length) {
463			musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
464			csr |= MUSB_CSR0_P_DATAEND;
465		} else
466			req = NULL;
467	} else
468		csr = MUSB_CSR0_P_SVDRXPKTRDY | MUSB_CSR0_P_SENDSTALL;
469
470
471	/* Completion handler may choose to stall, e.g. because the
472	 * message just received holds invalid data.
473	 */
474	if (req) {
475		musb->ackpend = csr;
476		musb_g_ep0_giveback(musb, req);
477		if (!musb->ackpend)
478			return;
479		musb->ackpend = 0;
480	}
481	musb_ep_select(musb->mregs, 0);
482	musb_writew(regs, MUSB_CSR0, csr);
483}
484
485/*
486 * transmitting to the host (IN), this code might be called from IRQ
487 * and from kernel thread.
488 *
489 * Context:  caller holds controller lock
490 */
491static void ep0_txstate(struct musb *musb)
492{
493	void __iomem		*regs = musb->control_ep->regs;
494	struct usb_request	*request = next_ep0_request(musb);
495	u16			csr = MUSB_CSR0_TXPKTRDY;
496	u8			*fifo_src;
497	u8			fifo_count;
498
499	if (!request) {
500		/* WARN_ON(1); */
501		DBG(2, "odd; csr0 %04x\n", musb_readw(regs, MUSB_CSR0));
502		return;
503	}
504
505	/* load the data */
506	fifo_src = (u8 *) request->buf + request->actual;
507	fifo_count = min((unsigned) MUSB_EP0_FIFOSIZE,
508		request->length - request->actual);
509	musb_write_fifo(&musb->endpoints[0], fifo_count, fifo_src);
510	request->actual += fifo_count;
511
512	/* update the flags */
513	if (fifo_count < MUSB_MAX_END0_PACKET
514			|| (request->actual == request->length
515				&& !request->zero)) {
516		musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT;
517		csr |= MUSB_CSR0_P_DATAEND;
518	} else
519		request = NULL;
520
521	/* report completions as soon as the fifo's loaded; there's no
522	 * win in waiting till this last packet gets acked.  (other than
523	 * very precise fault reporting, needed by USB TMC; possible with
524	 * this hardware, but not usable from portable gadget drivers.)
525	 */
526	if (request) {
527		musb->ackpend = csr;
528		musb_g_ep0_giveback(musb, request);
529		if (!musb->ackpend)
530			return;
531		musb->ackpend = 0;
532	}
533
534	/* send it out, triggering a "txpktrdy cleared" irq */
535	musb_ep_select(musb->mregs, 0);
536	musb_writew(regs, MUSB_CSR0, csr);
537}
538
539/*
540 * Read a SETUP packet (struct usb_ctrlrequest) from the hardware.
541 * Fields are left in USB byte-order.
542 *
543 * Context:  caller holds controller lock.
544 */
545static void
546musb_read_setup(struct musb *musb, struct usb_ctrlrequest *req)
547{
548	struct usb_request	*r;
549	void __iomem		*regs = musb->control_ep->regs;
550
551	musb_read_fifo(&musb->endpoints[0], sizeof *req, (u8 *)req);
552
553	/* NOTE:  earlier 2.6 versions changed setup packets to host
554	 * order, but now USB packets always stay in USB byte order.
555	 */
556	DBG(3, "SETUP req%02x.%02x v%04x i%04x l%d\n",
557		req->bRequestType,
558		req->bRequest,
559		le16_to_cpu(req->wValue),
560		le16_to_cpu(req->wIndex),
561		le16_to_cpu(req->wLength));
562
563	/* clean up any leftover transfers */
564	r = next_ep0_request(musb);
565	if (r)
566		musb_g_ep0_giveback(musb, r);
567
568	/* For zero-data requests we want to delay the STATUS stage to
569	 * avoid SETUPEND errors.  If we read data (OUT), delay accepting
570	 * packets until there's a buffer to store them in.
571	 *
572	 * If we write data, the controller acts happier if we enable
573	 * the TX FIFO right away, and give the controller a moment
574	 * to switch modes...
575	 */
576	musb->set_address = false;
577	musb->ackpend = MUSB_CSR0_P_SVDRXPKTRDY;
578	if (req->wLength == 0) {
579		if (req->bRequestType & USB_DIR_IN)
580			musb->ackpend |= MUSB_CSR0_TXPKTRDY;
581		musb->ep0_state = MUSB_EP0_STAGE_ACKWAIT;
582	} else if (req->bRequestType & USB_DIR_IN) {
583		musb->ep0_state = MUSB_EP0_STAGE_TX;
584		musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDRXPKTRDY);
585		while ((musb_readw(regs, MUSB_CSR0)
586				& MUSB_CSR0_RXPKTRDY) != 0)
587			cpu_relax();
588		musb->ackpend = 0;
589	} else
590		musb->ep0_state = MUSB_EP0_STAGE_RX;
591}
592
593static int
594forward_to_driver(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest)
595__releases(musb->lock)
596__acquires(musb->lock)
597{
598	int retval;
599	if (!musb->gadget_driver)
600		return -EOPNOTSUPP;
601	spin_unlock(&musb->lock);
602	retval = musb->gadget_driver->setup(&musb->g, ctrlrequest);
603	spin_lock(&musb->lock);
604	return retval;
605}
606
607/*
608 * Handle peripheral ep0 interrupt
609 *
610 * Context: irq handler; we won't re-enter the driver that way.
611 */
612irqreturn_t musb_g_ep0_irq(struct musb *musb)
613{
614	u16		csr;
615	u16		len;
616	void __iomem	*mbase = musb->mregs;
617	void __iomem	*regs = musb->endpoints[0].regs;
618	irqreturn_t	retval = IRQ_NONE;
619
620	musb_ep_select(mbase, 0);	/* select ep0 */
621	csr = musb_readw(regs, MUSB_CSR0);
622	len = musb_readb(regs, MUSB_COUNT0);
623
624	DBG(4, "csr %04x, count %d, myaddr %d, ep0stage %s\n",
625			csr, len,
626			musb_readb(mbase, MUSB_FADDR),
627			decode_ep0stage(musb->ep0_state));
628
629	/* I sent a stall.. need to acknowledge it now.. */
630	if (csr & MUSB_CSR0_P_SENTSTALL) {
631		musb_writew(regs, MUSB_CSR0,
632				csr & ~MUSB_CSR0_P_SENTSTALL);
633		retval = IRQ_HANDLED;
634		musb->ep0_state = MUSB_EP0_STAGE_IDLE;
635		csr = musb_readw(regs, MUSB_CSR0);
636	}
637
638	/* request ended "early" */
639	if (csr & MUSB_CSR0_P_SETUPEND) {
640		musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDSETUPEND);
641		retval = IRQ_HANDLED;
642		/* Transition into the early status phase */
643		switch (musb->ep0_state) {
644		case MUSB_EP0_STAGE_TX:
645			musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT;
646			break;
647		case MUSB_EP0_STAGE_RX:
648			musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
649			break;
650		default:
651			ERR("SetupEnd came in a wrong ep0stage %s",
652			    decode_ep0stage(musb->ep0_state));
653		}
654		csr = musb_readw(regs, MUSB_CSR0);
655		/* NOTE:  request may need completion */
656	}
657
658	/* docs from Mentor only describe tx, rx, and idle/setup states.
659	 * we need to handle nuances around status stages, and also the
660	 * case where status and setup stages come back-to-back ...
661	 */
662	switch (musb->ep0_state) {
663
664	case MUSB_EP0_STAGE_TX:
665		/* irq on clearing txpktrdy */
666		if ((csr & MUSB_CSR0_TXPKTRDY) == 0) {
667			ep0_txstate(musb);
668			retval = IRQ_HANDLED;
669		}
670		break;
671
672	case MUSB_EP0_STAGE_RX:
673		/* irq on set rxpktrdy */
674		if (csr & MUSB_CSR0_RXPKTRDY) {
675			ep0_rxstate(musb);
676			retval = IRQ_HANDLED;
677		}
678		break;
679
680	case MUSB_EP0_STAGE_STATUSIN:
681		/* end of sequence #2 (OUT/RX state) or #3 (no data) */
682
683		/* update address (if needed) only @ the end of the
684		 * status phase per usb spec, which also guarantees
685		 * we get 10 msec to receive this irq... until this
686		 * is done we won't see the next packet.
687		 */
688		if (musb->set_address) {
689			musb->set_address = false;
690			musb_writeb(mbase, MUSB_FADDR, musb->address);
691		}
692
693		/* enter test mode if needed (exit by reset) */
694		else if (musb->test_mode) {
695			DBG(1, "entering TESTMODE\n");
696
697			if (MUSB_TEST_PACKET == musb->test_mode_nr)
698				musb_load_testpacket(musb);
699
700			musb_writeb(mbase, MUSB_TESTMODE,
701					musb->test_mode_nr);
702		}
703		/* FALLTHROUGH */
704
705	case MUSB_EP0_STAGE_STATUSOUT:
706		/* end of sequence #1: write to host (TX state) */
707		{
708			struct usb_request	*req;
709
710			req = next_ep0_request(musb);
711			if (req)
712				musb_g_ep0_giveback(musb, req);
713		}
714
715		/*
716		 * In case when several interrupts can get coalesced,
717		 * check to see if we've already received a SETUP packet...
718		 */
719		if (csr & MUSB_CSR0_RXPKTRDY)
720			goto setup;
721
722		retval = IRQ_HANDLED;
723		musb->ep0_state = MUSB_EP0_STAGE_IDLE;
724		break;
725
726	case MUSB_EP0_STAGE_IDLE:
727		/*
728		 * This state is typically (but not always) indiscernible
729		 * from the status states since the corresponding interrupts
730		 * tend to happen within too little period of time (with only
731		 * a zero-length packet in between) and so get coalesced...
732		 */
733		retval = IRQ_HANDLED;
734		musb->ep0_state = MUSB_EP0_STAGE_SETUP;
735		/* FALLTHROUGH */
736
737	case MUSB_EP0_STAGE_SETUP:
738setup:
739		if (csr & MUSB_CSR0_RXPKTRDY) {
740			struct usb_ctrlrequest	setup;
741			int			handled = 0;
742
743			if (len != 8) {
744				ERR("SETUP packet len %d != 8 ?\n", len);
745				break;
746			}
747			musb_read_setup(musb, &setup);
748			retval = IRQ_HANDLED;
749
750			/* sometimes the RESET won't be reported */
751			if (unlikely(musb->g.speed == USB_SPEED_UNKNOWN)) {
752				u8	power;
753
754				printk(KERN_NOTICE "%s: peripheral reset "
755						"irq lost!\n",
756						musb_driver_name);
757				power = musb_readb(mbase, MUSB_POWER);
758				musb->g.speed = (power & MUSB_POWER_HSMODE)
759					? USB_SPEED_HIGH : USB_SPEED_FULL;
760
761			}
762
763			switch (musb->ep0_state) {
764
765			/* sequence #3 (no data stage), includes requests
766			 * we can't forward (notably SET_ADDRESS and the
767			 * device/endpoint feature set/clear operations)
768			 * plus SET_CONFIGURATION and others we must
769			 */
770			case MUSB_EP0_STAGE_ACKWAIT:
771				handled = service_zero_data_request(
772						musb, &setup);
773
774				/* status stage might be immediate */
775				if (handled > 0) {
776					musb->ackpend |= MUSB_CSR0_P_DATAEND;
777					musb->ep0_state =
778						MUSB_EP0_STAGE_STATUSIN;
779				}
780				break;
781
782			/* sequence #1 (IN to host), includes GET_STATUS
783			 * requests that we can't forward, GET_DESCRIPTOR
784			 * and others that we must
785			 */
786			case MUSB_EP0_STAGE_TX:
787				handled = service_in_request(musb, &setup);
788				if (handled > 0) {
789					musb->ackpend = MUSB_CSR0_TXPKTRDY
790						| MUSB_CSR0_P_DATAEND;
791					musb->ep0_state =
792						MUSB_EP0_STAGE_STATUSOUT;
793				}
794				break;
795
796			/* sequence #2 (OUT from host), always forward */
797			default:		/* MUSB_EP0_STAGE_RX */
798				break;
799			}
800
801			DBG(3, "handled %d, csr %04x, ep0stage %s\n",
802				handled, csr,
803				decode_ep0stage(musb->ep0_state));
804
805			/* unless we need to delegate this to the gadget
806			 * driver, we know how to wrap this up:  csr0 has
807			 * not yet been written.
808			 */
809			if (handled < 0)
810				goto stall;
811			else if (handled > 0)
812				goto finish;
813
814			handled = forward_to_driver(musb, &setup);
815			if (handled < 0) {
816				musb_ep_select(mbase, 0);
817stall:
818				DBG(3, "stall (%d)\n", handled);
819				musb->ackpend |= MUSB_CSR0_P_SENDSTALL;
820				musb->ep0_state = MUSB_EP0_STAGE_IDLE;
821finish:
822				musb_writew(regs, MUSB_CSR0,
823						musb->ackpend);
824				musb->ackpend = 0;
825			}
826		}
827		break;
828
829	case MUSB_EP0_STAGE_ACKWAIT:
830		/* This should not happen. But happens with tusb6010 with
831		 * g_file_storage and high speed. Do nothing.
832		 */
833		retval = IRQ_HANDLED;
834		break;
835
836	default:
837		/* "can't happen" */
838		WARN_ON(1);
839		musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SENDSTALL);
840		musb->ep0_state = MUSB_EP0_STAGE_IDLE;
841		break;
842	}
843
844	return retval;
845}
846
847
848static int
849musb_g_ep0_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *desc)
850{
851	/* always enabled */
852	return -EINVAL;
853}
854
855static int musb_g_ep0_disable(struct usb_ep *e)
856{
857	/* always enabled */
858	return -EINVAL;
859}
860
861static int
862musb_g_ep0_queue(struct usb_ep *e, struct usb_request *r, gfp_t gfp_flags)
863{
864	struct musb_ep		*ep;
865	struct musb_request	*req;
866	struct musb		*musb;
867	int			status;
868	unsigned long		lockflags;
869	void __iomem		*regs;
870
871	if (!e || !r)
872		return -EINVAL;
873
874	ep = to_musb_ep(e);
875	musb = ep->musb;
876	regs = musb->control_ep->regs;
877
878	req = to_musb_request(r);
879	req->musb = musb;
880	req->request.actual = 0;
881	req->request.status = -EINPROGRESS;
882	req->tx = ep->is_in;
883
884	spin_lock_irqsave(&musb->lock, lockflags);
885
886	if (!list_empty(&ep->req_list)) {
887		status = -EBUSY;
888		goto cleanup;
889	}
890
891	switch (musb->ep0_state) {
892	case MUSB_EP0_STAGE_RX:		/* control-OUT data */
893	case MUSB_EP0_STAGE_TX:		/* control-IN data */
894	case MUSB_EP0_STAGE_ACKWAIT:	/* zero-length data */
895		status = 0;
896		break;
897	default:
898		DBG(1, "ep0 request queued in state %d\n",
899				musb->ep0_state);
900		status = -EINVAL;
901		goto cleanup;
902	}
903
904	/* add request to the list */
905	list_add_tail(&(req->request.list), &(ep->req_list));
906
907	DBG(3, "queue to %s (%s), length=%d\n",
908			ep->name, ep->is_in ? "IN/TX" : "OUT/RX",
909			req->request.length);
910
911	musb_ep_select(musb->mregs, 0);
912
913	/* sequence #1, IN ... start writing the data */
914	if (musb->ep0_state == MUSB_EP0_STAGE_TX)
915		ep0_txstate(musb);
916
917	/* sequence #3, no-data ... issue IN status */
918	else if (musb->ep0_state == MUSB_EP0_STAGE_ACKWAIT) {
919		if (req->request.length)
920			status = -EINVAL;
921		else {
922			musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
923			musb_writew(regs, MUSB_CSR0,
924					musb->ackpend | MUSB_CSR0_P_DATAEND);
925			musb->ackpend = 0;
926			musb_g_ep0_giveback(ep->musb, r);
927		}
928
929	/* else for sequence #2 (OUT), caller provides a buffer
930	 * before the next packet arrives.  deferred responses
931	 * (after SETUP is acked) are racey.
932	 */
933	} else if (musb->ackpend) {
934		musb_writew(regs, MUSB_CSR0, musb->ackpend);
935		musb->ackpend = 0;
936	}
937
938cleanup:
939	spin_unlock_irqrestore(&musb->lock, lockflags);
940	return status;
941}
942
943static int musb_g_ep0_dequeue(struct usb_ep *ep, struct usb_request *req)
944{
945	/* we just won't support this */
946	return -EINVAL;
947}
948
949static int musb_g_ep0_halt(struct usb_ep *e, int value)
950{
951	struct musb_ep		*ep;
952	struct musb		*musb;
953	void __iomem		*base, *regs;
954	unsigned long		flags;
955	int			status;
956	u16			csr;
957
958	if (!e || !value)
959		return -EINVAL;
960
961	ep = to_musb_ep(e);
962	musb = ep->musb;
963	base = musb->mregs;
964	regs = musb->control_ep->regs;
965	status = 0;
966
967	spin_lock_irqsave(&musb->lock, flags);
968
969	if (!list_empty(&ep->req_list)) {
970		status = -EBUSY;
971		goto cleanup;
972	}
973
974	musb_ep_select(base, 0);
975	csr = musb->ackpend;
976
977	switch (musb->ep0_state) {
978
979	/* Stalls are usually issued after parsing SETUP packet, either
980	 * directly in irq context from setup() or else later.
981	 */
982	case MUSB_EP0_STAGE_TX:		/* control-IN data */
983	case MUSB_EP0_STAGE_ACKWAIT:	/* STALL for zero-length data */
984	case MUSB_EP0_STAGE_RX:		/* control-OUT data */
985		csr = musb_readw(regs, MUSB_CSR0);
986		/* FALLTHROUGH */
987
988	/* It's also OK to issue stalls during callbacks when a non-empty
989	 * DATA stage buffer has been read (or even written).
990	 */
991	case MUSB_EP0_STAGE_STATUSIN:	/* control-OUT status */
992	case MUSB_EP0_STAGE_STATUSOUT:	/* control-IN status */
993
994		csr |= MUSB_CSR0_P_SENDSTALL;
995		musb_writew(regs, MUSB_CSR0, csr);
996		musb->ep0_state = MUSB_EP0_STAGE_IDLE;
997		musb->ackpend = 0;
998		break;
999	default:
1000		DBG(1, "ep0 can't halt in state %d\n", musb->ep0_state);
1001		status = -EINVAL;
1002	}
1003
1004cleanup:
1005	spin_unlock_irqrestore(&musb->lock, flags);
1006	return status;
1007}
1008
1009const struct usb_ep_ops musb_g_ep0_ops = {
1010	.enable		= musb_g_ep0_enable,
1011	.disable	= musb_g_ep0_disable,
1012	.alloc_request	= musb_alloc_request,
1013	.free_request	= musb_free_request,
1014	.queue		= musb_g_ep0_queue,
1015	.dequeue	= musb_g_ep0_dequeue,
1016	.set_halt	= musb_g_ep0_halt,
1017};
1018