1	// SPDX-License-Identifier: GPL-2.0+
2	/*
3	* at91_udc -- driver for at91-series USB peripheral controller
4	*
5	* Copyright (C) 2004 by Thomas Rathbone
6	* Copyright (C) 2005 by HP Labs
7	* Copyright (C) 2005 by David Brownell
8	*/
9
10	#undef VERBOSE_DEBUG
11	#undef PACKET_TRACE
12
13	#include <linux/kernel.h>
14	#include <linux/module.h>
15	#include <linux/platform_device.h>
16	#include <linux/delay.h>
17	#include <linux/ioport.h>
18	#include <linux/slab.h>
19	#include <linux/errno.h>
20	#include <linux/list.h>
21	#include <linux/interrupt.h>
22	#include <linux/proc_fs.h>
23	#include <linux/prefetch.h>
24	#include <linux/clk.h>
25	#include <linux/usb/ch9.h>
26	#include <linux/usb/gadget.h>
27	#include <linux/of.h>
28	#include <linux/gpio/consumer.h>
29	#include <linux/platform_data/atmel.h>
30	#include <linux/regmap.h>
31	#include <linux/mfd/syscon.h>
32	#include <linux/mfd/syscon/atmel-matrix.h>
33
34	#include "at91_udc.h"
35
36
37	/*
38	* This controller is simple and PIO-only. It's used in many AT91-series
39	* full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
40	* at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
41	*
42	* This driver expects the board has been wired with two GPIOs supporting
43	* a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
44	* testing hasn't covered such cases.)
45	*
46	* The pullup is most important (so it's integrated on sam926x parts). It
47	* provides software control over whether the host enumerates the device.
48	*
49	* The VBUS sensing helps during enumeration, and allows both USB clocks
50	* (and the transceiver) to stay gated off until they're necessary, saving
51	* power. During USB suspend, the 48 MHz clock is gated off in hardware;
52	* it may also be gated off by software during some Linux sleep states.
53	*/
54
55	#define DRIVER_VERSION "3 May 2006"
56
57	static const char driver_name [] = "at91_udc";
58
59	static const struct {
60	const char *name;
61	const struct usb_ep_caps caps;
62	} ep_info[] = {
63	#define EP_INFO(_name, _caps) \
64	{ \
65	.name = _name, \
66	.caps = _caps, \
67	}
68
69	EP_INFO("ep0",
70	USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
71	EP_INFO("ep1",
72	USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
73	EP_INFO("ep2",
74	USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
75	EP_INFO("ep3-int",
76	USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_ALL)),
77	EP_INFO("ep4",
78	USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
79	EP_INFO("ep5",
80	USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
81
82	#undef EP_INFO
83	};
84
85	#define ep0name ep_info[0].name
86
87	#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
88
89	#define at91_udp_read(udc, reg) \
90	__raw_readl((udc)->udp_baseaddr + (reg))
91	#define at91_udp_write(udc, reg, val) \
92	__raw_writel((val), (udc)->udp_baseaddr + (reg))
93
94	/*-------------------------------------------------------------------------*/
95
96	#ifdef CONFIG_USB_GADGET_DEBUG_FILES
97
98	#include <linux/seq_file.h>
99
100	static const char debug_filename[] = "driver/udc";
101
102	#define FOURBITS "%s%s%s%s"
103	#define EIGHTBITS FOURBITS FOURBITS
104
105	static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
106	{
107	static char *types[] = {
108	"control", "out-iso", "out-bulk", "out-int",
109	"BOGUS", "in-iso", "in-bulk", "in-int"};
110
111	u32 csr;
112	struct at91_request *req;
113	unsigned long flags;
114	struct at91_udc *udc = ep->udc;
115
116	spin_lock_irqsave(&udc->lock, flags);
117
118	csr = __raw_readl(addr: ep->creg);
119
120	/* NOTE: not collecting per-endpoint irq statistics... */
121
122	seq_printf(m: s, fmt: "\n");
123	seq_printf(m: s, fmt: "%s, maxpacket %d %s%s %s%s\n",
124	ep->ep.name, ep->ep.maxpacket,
125	ep->is_in ? "in" : "out",
126	ep->is_iso ? " iso" : "",
127	ep->is_pingpong
128	? (ep->fifo_bank ? "pong" : "ping")
129	: "",
130	ep->stopped ? " stopped" : "");
131	seq_printf(m: s, fmt: "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
132	csr,
133	(csr & 0x07ff0000) >> 16,
134	(csr & (1 << 15)) ? "enabled" : "disabled",
135	(csr & (1 << 11)) ? "DATA1" : "DATA0",
136	types[(csr & 0x700) >> 8],
137
138	/* iff type is control then print current direction */
139	(!(csr & 0x700))
140	? ((csr & (1 << 7)) ? " IN" : " OUT")
141	: "",
142	(csr & (1 << 6)) ? " rxdatabk1" : "",
143	(csr & (1 << 5)) ? " forcestall" : "",
144	(csr & (1 << 4)) ? " txpktrdy" : "",
145
146	(csr & (1 << 3)) ? " stallsent" : "",
147	(csr & (1 << 2)) ? " rxsetup" : "",
148	(csr & (1 << 1)) ? " rxdatabk0" : "",
149	(csr & (1 << 0)) ? " txcomp" : "");
150	if (list_empty (head: &ep->queue))
151	seq_printf(m: s, fmt: "\t(queue empty)\n");
152
153	else list_for_each_entry (req, &ep->queue, queue) {
154	unsigned length = req->req.actual;
155
156	seq_printf(m: s, fmt: "\treq %p len %d/%d buf %p\n",
157	&req->req, length,
158	req->req.length, req->req.buf);
159	}
160	spin_unlock_irqrestore(lock: &udc->lock, flags);
161	}
162
163	static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
164	{
165	int i;
166
167	seq_printf(m: s, fmt: "%s %04x:%s%s" FOURBITS, label, mask,
168	(mask & (1 << 13)) ? " wakeup" : "",
169	(mask & (1 << 12)) ? " endbusres" : "",
170
171	(mask & (1 << 11)) ? " sofint" : "",
172	(mask & (1 << 10)) ? " extrsm" : "",
173	(mask & (1 << 9)) ? " rxrsm" : "",
174	(mask & (1 << 8)) ? " rxsusp" : "");
175	for (i = 0; i < 8; i++) {
176	if (mask & (1 << i))
177	seq_printf(m: s, fmt: " ep%d", i);
178	}
179	seq_printf(m: s, fmt: "\n");
180	}
181
182	static int proc_udc_show(struct seq_file *s, void *unused)
183	{
184	struct at91_udc *udc = s->private;
185	struct at91_ep *ep;
186	u32 tmp;
187
188	seq_printf(m: s, fmt: "%s: version %s\n", driver_name, DRIVER_VERSION);
189
190	seq_printf(m: s, fmt: "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
191	udc->vbus ? "present" : "off",
192	udc->enabled
193	? (udc->vbus ? "active" : "enabled")
194	: "disabled",
195	udc->gadget.is_selfpowered ? "self" : "VBUS",
196	udc->suspended ? ", suspended" : "",
197	udc->driver ? udc->driver->driver.name : "(none)");
198
199	/* don't access registers when interface isn't clocked */
200	if (!udc->clocked) {
201	seq_printf(m: s, fmt: "(not clocked)\n");
202	return 0;
203	}
204
205	tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
206	seq_printf(m: s, fmt: "frame %05x:%s%s frame=%d\n", tmp,
207	(tmp & AT91_UDP_FRM_OK) ? " ok" : "",
208	(tmp & AT91_UDP_FRM_ERR) ? " err" : "",
209	(tmp & AT91_UDP_NUM));
210
211	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
212	seq_printf(m: s, fmt: "glbstate %02x:%s" FOURBITS "\n", tmp,
213	(tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
214	(tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
215	(tmp & AT91_UDP_ESR) ? " esr" : "",
216	(tmp & AT91_UDP_CONFG) ? " confg" : "",
217	(tmp & AT91_UDP_FADDEN) ? " fadden" : "");
218
219	tmp = at91_udp_read(udc, AT91_UDP_FADDR);
220	seq_printf(m: s, fmt: "faddr %03x:%s fadd=%d\n", tmp,
221	(tmp & AT91_UDP_FEN) ? " fen" : "",
222	(tmp & AT91_UDP_FADD));
223
224	proc_irq_show(s, label: "imr ", at91_udp_read(udc, AT91_UDP_IMR));
225	proc_irq_show(s, label: "isr ", at91_udp_read(udc, AT91_UDP_ISR));
226
227	if (udc->enabled && udc->vbus) {
228	proc_ep_show(s, ep: &udc->ep[0]);
229	list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
230	if (ep->ep.desc)
231	proc_ep_show(s, ep);
232	}
233	}
234	return 0;
235	}
236
237	static void create_debug_file(struct at91_udc *udc)
238	{
239	udc->pde = proc_create_single_data(name: debug_filename, mode: 0, NULL,
240	show: proc_udc_show, data: udc);
241	}
242
243	static void remove_debug_file(struct at91_udc *udc)
244	{
245	if (udc->pde)
246	remove_proc_entry(debug_filename, NULL);
247	}
248
249	#else
250
251	static inline void create_debug_file(struct at91_udc *udc) {}
252	static inline void remove_debug_file(struct at91_udc *udc) {}
253
254	#endif
255
256
257	/*-------------------------------------------------------------------------*/
258
259	static void done(struct at91_ep *ep, struct at91_request *req, int status)
260	{
261	unsigned stopped = ep->stopped;
262	struct at91_udc *udc = ep->udc;
263
264	list_del_init(entry: &req->queue);
265	if (req->req.status == -EINPROGRESS)
266	req->req.status = status;
267	else
268	status = req->req.status;
269	if (status && status != -ESHUTDOWN)
270	VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
271
272	ep->stopped = 1;
273	spin_unlock(lock: &udc->lock);
274	usb_gadget_giveback_request(ep: &ep->ep, req: &req->req);
275	spin_lock(lock: &udc->lock);
276	ep->stopped = stopped;
277
278	/* ep0 is always ready; other endpoints need a non-empty queue */
279	if (list_empty(head: &ep->queue) && ep->int_mask != (1 << 0))
280	at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
281	}
282
283	/*-------------------------------------------------------------------------*/
284
285	/* bits indicating OUT fifo has data ready */
286	#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
287
288	/*
289	* Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
290	* back most of the value you just read (because of side effects, including
291	* bits that may change after reading and before writing).
292	*
293	* Except when changing a specific bit, always write values which:
294	* - clear SET_FX bits (setting them could change something)
295	* - set CLR_FX bits (clearing them could change something)
296	*
297	* There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
298	* that shouldn't normally be changed.
299	*
300	* NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
301	* implying a need to wait for one write to complete (test relevant bits)
302	* before starting the next write. This shouldn't be an issue given how
303	* infrequently we write, except maybe for write-then-read idioms.
304	*/
305	#define SET_FX (AT91_UDP_TXPKTRDY)
306	#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
307	| AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
308
309	/* pull OUT packet data from the endpoint's fifo */
310	static int read_fifo (struct at91_ep *ep, struct at91_request *req)
311	{
312	u32 __iomem *creg = ep->creg;
313	u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
314	u32 csr;
315	u8 *buf;
316	unsigned int count, bufferspace, is_done;
317
318	buf = req->req.buf + req->req.actual;
319	bufferspace = req->req.length - req->req.actual;
320
321	/*
322	* there might be nothing to read if ep_queue() calls us,
323	* or if we already emptied both pingpong buffers
324	*/
325	rescan:
326	csr = __raw_readl(addr: creg);
327	if ((csr & RX_DATA_READY) == 0)
328	return 0;
329
330	count = (csr & AT91_UDP_RXBYTECNT) >> 16;
331	if (count > ep->ep.maxpacket)
332	count = ep->ep.maxpacket;
333	if (count > bufferspace) {
334	DBG("%s buffer overflow\n", ep->ep.name);
335	req->req.status = -EOVERFLOW;
336	count = bufferspace;
337	}
338	__raw_readsb(dreg, buf, count);
339
340	/* release and swap pingpong mem bank */
341	csr |= CLR_FX;
342	if (ep->is_pingpong) {
343	if (ep->fifo_bank == 0) {
344	csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
345	ep->fifo_bank = 1;
346	} else {
347	csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
348	ep->fifo_bank = 0;
349	}
350	} else
351	csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
352	__raw_writel(val: csr, addr: creg);
353
354	req->req.actual += count;
355	is_done = (count < ep->ep.maxpacket);
356	if (count == bufferspace)
357	is_done = 1;
358
359	PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
360	is_done ? " (done)" : "");
361
362	/*
363	* avoid extra trips through IRQ logic for packets already in
364	* the fifo ... maybe preventing an extra (expensive) OUT-NAK
365	*/
366	if (is_done)
367	done(ep, req, status: 0);
368	else if (ep->is_pingpong) {
369	/*
370	* One dummy read to delay the code because of a HW glitch:
371	* CSR returns bad RXCOUNT when read too soon after updating
372	* RX_DATA_BK flags.
373	*/
374	csr = __raw_readl(addr: creg);
375
376	bufferspace -= count;
377	buf += count;
378	goto rescan;
379	}
380
381	return is_done;
382	}
383
384	/* load fifo for an IN packet */
385	static int write_fifo(struct at91_ep *ep, struct at91_request *req)
386	{
387	u32 __iomem *creg = ep->creg;
388	u32 csr = __raw_readl(addr: creg);
389	u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
390	unsigned total, count, is_last;
391	u8 *buf;
392
393	/*
394	* TODO: allow for writing two packets to the fifo ... that'll
395	* reduce the amount of IN-NAKing, but probably won't affect
396	* throughput much. (Unlike preventing OUT-NAKing!)
397	*/
398
399	/*
400	* If ep_queue() calls us, the queue is empty and possibly in
401	* odd states like TXCOMP not yet cleared (we do it, saving at
402	* least one IRQ) or the fifo not yet being free. Those aren't
403	* issues normally (IRQ handler fast path).
404	*/
405	if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
406	if (csr & AT91_UDP_TXCOMP) {
407	csr |= CLR_FX;
408	csr &= ~(SET_FX | AT91_UDP_TXCOMP);
409	__raw_writel(val: csr, addr: creg);
410	csr = __raw_readl(addr: creg);
411	}
412	if (csr & AT91_UDP_TXPKTRDY)
413	return 0;
414	}
415
416	buf = req->req.buf + req->req.actual;
417	prefetch(buf);
418	total = req->req.length - req->req.actual;
419	if (ep->ep.maxpacket < total) {
420	count = ep->ep.maxpacket;
421	is_last = 0;
422	} else {
423	count = total;
424	is_last = (count < ep->ep.maxpacket) || !req->req.zero;
425	}
426
427	/*
428	* Write the packet, maybe it's a ZLP.
429	*
430	* NOTE: incrementing req->actual before we receive the ACK means
431	* gadget driver IN bytecounts can be wrong in fault cases. That's
432	* fixable with PIO drivers like this one (save "count" here, and
433	* do the increment later on TX irq), but not for most DMA hardware.
434	*
435	* So all gadget drivers must accept that potential error. Some
436	* hardware supports precise fifo status reporting, letting them
437	* recover when the actual bytecount matters (e.g. for USB Test
438	* and Measurement Class devices).
439	*/
440	__raw_writesb(dreg, buf, count);
441	csr &= ~SET_FX;
442	csr |= CLR_FX | AT91_UDP_TXPKTRDY;
443	__raw_writel(val: csr, addr: creg);
444	req->req.actual += count;
445
446	PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
447	is_last ? " (done)" : "");
448	if (is_last)
449	done(ep, req, status: 0);
450	return is_last;
451	}
452
453	static void nuke(struct at91_ep *ep, int status)
454	{
455	struct at91_request *req;
456
457	/* terminate any request in the queue */
458	ep->stopped = 1;
459	if (list_empty(head: &ep->queue))
460	return;
461
462	VDBG("%s %s\n", __func__, ep->ep.name);
463	while (!list_empty(head: &ep->queue)) {
464	req = list_entry(ep->queue.next, struct at91_request, queue);
465	done(ep, req, status);
466	}
467	}
468
469	/*-------------------------------------------------------------------------*/
470
471	static int at91_ep_enable(struct usb_ep *_ep,
472	const struct usb_endpoint_descriptor *desc)
473	{
474	struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
475	struct at91_udc *udc;
476	u16 maxpacket;
477	u32 tmp;
478	unsigned long flags;
479
480	if (!_ep || !ep
481	|| !desc || _ep->name == ep0name
482	|| desc->bDescriptorType != USB_DT_ENDPOINT
483	|| (maxpacket = usb_endpoint_maxp(epd: desc)) == 0
484	|| maxpacket > ep->maxpacket) {
485	DBG("bad ep or descriptor\n");
486	return -EINVAL;
487	}
488
489	udc = ep->udc;
490	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
491	DBG("bogus device state\n");
492	return -ESHUTDOWN;
493	}
494
495	tmp = usb_endpoint_type(epd: desc);
496	switch (tmp) {
497	case USB_ENDPOINT_XFER_CONTROL:
498	DBG("only one control endpoint\n");
499	return -EINVAL;
500	case USB_ENDPOINT_XFER_INT:
501	if (maxpacket > 64)
502	goto bogus_max;
503	break;
504	case USB_ENDPOINT_XFER_BULK:
505	switch (maxpacket) {
506	case 8:
507	case 16:
508	case 32:
509	case 64:
510	goto ok;
511	}
512	bogus_max:
513	DBG("bogus maxpacket %d\n", maxpacket);
514	return -EINVAL;
515	case USB_ENDPOINT_XFER_ISOC:
516	if (!ep->is_pingpong) {
517	DBG("iso requires double buffering\n");
518	return -EINVAL;
519	}
520	break;
521	}
522
523	ok:
524	spin_lock_irqsave(&udc->lock, flags);
525
526	/* initialize endpoint to match this descriptor */
527	ep->is_in = usb_endpoint_dir_in(epd: desc);
528	ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
529	ep->stopped = 0;
530	if (ep->is_in)
531	tmp |= 0x04;
532	tmp <<= 8;
533	tmp |= AT91_UDP_EPEDS;
534	__raw_writel(val: tmp, addr: ep->creg);
535
536	ep->ep.maxpacket = maxpacket;
537
538	/*
539	* reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
540	* since endpoint resets don't reset hw pingpong state.
541	*/
542	at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
543	at91_udp_write(udc, AT91_UDP_RST_EP, 0);
544
545	spin_unlock_irqrestore(lock: &udc->lock, flags);
546	return 0;
547	}
548
549	static int at91_ep_disable (struct usb_ep * _ep)
550	{
551	struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
552	struct at91_udc *udc = ep->udc;
553	unsigned long flags;
554
555	if (ep == &ep->udc->ep[0])
556	return -EINVAL;
557
558	spin_lock_irqsave(&udc->lock, flags);
559
560	nuke(ep, status: -ESHUTDOWN);
561
562	/* restore the endpoint's pristine config */
563	ep->ep.desc = NULL;
564	ep->ep.maxpacket = ep->maxpacket;
565
566	/* reset fifos and endpoint */
567	if (ep->udc->clocked) {
568	at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
569	at91_udp_write(udc, AT91_UDP_RST_EP, 0);
570	__raw_writel(val: 0, addr: ep->creg);
571	}
572
573	spin_unlock_irqrestore(lock: &udc->lock, flags);
574	return 0;
575	}
576
577	/*
578	* this is a PIO-only driver, so there's nothing
579	* interesting for request or buffer allocation.
580	*/
581
582	static struct usb_request *
583	at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
584	{
585	struct at91_request *req;
586
587	req = kzalloc(size: sizeof (struct at91_request), flags: gfp_flags);
588	if (!req)
589	return NULL;
590
591	INIT_LIST_HEAD(list: &req->queue);
592	return &req->req;
593	}
594
595	static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
596	{
597	struct at91_request *req;
598
599	req = container_of(_req, struct at91_request, req);
600	BUG_ON(!list_empty(&req->queue));
601	kfree(objp: req);
602	}
603
604	static int at91_ep_queue(struct usb_ep *_ep,
605	struct usb_request *_req, gfp_t gfp_flags)
606	{
607	struct at91_request *req;
608	struct at91_ep *ep;
609	struct at91_udc *udc;
610	int status;
611	unsigned long flags;
612
613	req = container_of(_req, struct at91_request, req);
614	ep = container_of(_ep, struct at91_ep, ep);
615
616	if (!_req || !_req->complete
617	|| !_req->buf || !list_empty(head: &req->queue)) {
618	DBG("invalid request\n");
619	return -EINVAL;
620	}
621
622	if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
623	DBG("invalid ep\n");
624	return -EINVAL;
625	}
626
627	udc = ep->udc;
628
629	if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
630	DBG("invalid device\n");
631	return -EINVAL;
632	}
633
634	_req->status = -EINPROGRESS;
635	_req->actual = 0;
636
637	spin_lock_irqsave(&udc->lock, flags);
638
639	/* try to kickstart any empty and idle queue */
640	if (list_empty(head: &ep->queue) && !ep->stopped) {
641	int is_ep0;
642
643	/*
644	* If this control request has a non-empty DATA stage, this
645	* will start that stage. It works just like a non-control
646	* request (until the status stage starts, maybe early).
647	*
648	* If the data stage is empty, then this starts a successful
649	* IN/STATUS stage. (Unsuccessful ones use set_halt.)
650	*/
651	is_ep0 = (ep->ep.name == ep0name);
652	if (is_ep0) {
653	u32 tmp;
654
655	if (!udc->req_pending) {
656	status = -EINVAL;
657	goto done;
658	}
659
660	/*
661	* defer changing CONFG until after the gadget driver
662	* reconfigures the endpoints.
663	*/
664	if (udc->wait_for_config_ack) {
665	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
666	tmp ^= AT91_UDP_CONFG;
667	VDBG("toggle config\n");
668	at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
669	}
670	if (req->req.length == 0) {
671	ep0_in_status:
672	PACKET("ep0 in/status\n");
673	status = 0;
674	tmp = __raw_readl(addr: ep->creg);
675	tmp &= ~SET_FX;
676	tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
677	__raw_writel(val: tmp, addr: ep->creg);
678	udc->req_pending = 0;
679	goto done;
680	}
681	}
682
683	if (ep->is_in)
684	status = write_fifo(ep, req);
685	else {
686	status = read_fifo(ep, req);
687
688	/* IN/STATUS stage is otherwise triggered by irq */
689	if (status && is_ep0)
690	goto ep0_in_status;
691	}
692	} else
693	status = 0;
694
695	if (req && !status) {
696	list_add_tail (new: &req->queue, head: &ep->queue);
697	at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
698	}
699	done:
700	spin_unlock_irqrestore(lock: &udc->lock, flags);
701	return (status < 0) ? status : 0;
702	}
703
704	static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
705	{
706	struct at91_ep *ep;
707	struct at91_request *req = NULL, *iter;
708	unsigned long flags;
709	struct at91_udc *udc;
710
711	ep = container_of(_ep, struct at91_ep, ep);
712	if (!_ep || ep->ep.name == ep0name)
713	return -EINVAL;
714
715	udc = ep->udc;
716
717	spin_lock_irqsave(&udc->lock, flags);
718
719	/* make sure it's actually queued on this endpoint */
720	list_for_each_entry(iter, &ep->queue, queue) {
721	if (&iter->req != _req)
722	continue;
723	req = iter;
724	break;
725	}
726	if (!req) {
727	spin_unlock_irqrestore(lock: &udc->lock, flags);
728	return -EINVAL;
729	}
730
731	done(ep, req, status: -ECONNRESET);
732	spin_unlock_irqrestore(lock: &udc->lock, flags);
733	return 0;
734	}
735
736	static int at91_ep_set_halt(struct usb_ep *_ep, int value)
737	{
738	struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
739	struct at91_udc *udc = ep->udc;
740	u32 __iomem *creg;
741	u32 csr;
742	unsigned long flags;
743	int status = 0;
744
745	if (!_ep || ep->is_iso || !ep->udc->clocked)
746	return -EINVAL;
747
748	creg = ep->creg;
749	spin_lock_irqsave(&udc->lock, flags);
750
751	csr = __raw_readl(addr: creg);
752
753	/*
754	* fail with still-busy IN endpoints, ensuring correct sequencing
755	* of data tx then stall. note that the fifo rx bytecount isn't
756	* completely accurate as a tx bytecount.
757	*/
758	if (ep->is_in && (!list_empty(head: &ep->queue) || (csr >> 16) != 0))
759	status = -EAGAIN;
760	else {
761	csr |= CLR_FX;
762	csr &= ~SET_FX;
763	if (value) {
764	csr |= AT91_UDP_FORCESTALL;
765	VDBG("halt %s\n", ep->ep.name);
766	} else {
767	at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
768	at91_udp_write(udc, AT91_UDP_RST_EP, 0);
769	csr &= ~AT91_UDP_FORCESTALL;
770	}
771	__raw_writel(val: csr, addr: creg);
772	}
773
774	spin_unlock_irqrestore(lock: &udc->lock, flags);
775	return status;
776	}
777
778	static const struct usb_ep_ops at91_ep_ops = {
779	.enable = at91_ep_enable,
780	.disable = at91_ep_disable,
781	.alloc_request = at91_ep_alloc_request,
782	.free_request = at91_ep_free_request,
783	.queue = at91_ep_queue,
784	.dequeue = at91_ep_dequeue,
785	.set_halt = at91_ep_set_halt,
786	/* there's only imprecise fifo status reporting */
787	};
788
789	/*-------------------------------------------------------------------------*/
790
791	static int at91_get_frame(struct usb_gadget *gadget)
792	{
793	struct at91_udc *udc = to_udc(g: gadget);
794
795	if (!to_udc(g: gadget)->clocked)
796	return -EINVAL;
797	return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
798	}
799
800	static int at91_wakeup(struct usb_gadget *gadget)
801	{
802	struct at91_udc *udc = to_udc(g: gadget);
803	u32 glbstate;
804	unsigned long flags;
805
806	DBG("%s\n", __func__ );
807	spin_lock_irqsave(&udc->lock, flags);
808
809	if (!udc->clocked || !udc->suspended)
810	goto done;
811
812	/* NOTE: some "early versions" handle ESR differently ... */
813
814	glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
815	if (!(glbstate & AT91_UDP_ESR))
816	goto done;
817	glbstate |= AT91_UDP_ESR;
818	at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
819
820	done:
821	spin_unlock_irqrestore(lock: &udc->lock, flags);
822	return 0;
823	}
824
825	/* reinit == restore initial software state */
826	static void udc_reinit(struct at91_udc *udc)
827	{
828	u32 i;
829
830	INIT_LIST_HEAD(list: &udc->gadget.ep_list);
831	INIT_LIST_HEAD(list: &udc->gadget.ep0->ep_list);
832	udc->gadget.quirk_stall_not_supp = 1;
833
834	for (i = 0; i < NUM_ENDPOINTS; i++) {
835	struct at91_ep *ep = &udc->ep[i];
836
837	if (i != 0)
838	list_add_tail(new: &ep->ep.ep_list, head: &udc->gadget.ep_list);
839	ep->ep.desc = NULL;
840	ep->stopped = 0;
841	ep->fifo_bank = 0;
842	usb_ep_set_maxpacket_limit(ep: &ep->ep, maxpacket_limit: ep->maxpacket);
843	ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
844	/* initialize one queue per endpoint */
845	INIT_LIST_HEAD(list: &ep->queue);
846	}
847	}
848
849	static void reset_gadget(struct at91_udc *udc)
850	{
851	struct usb_gadget_driver *driver = udc->driver;
852	int i;
853
854	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
855	driver = NULL;
856	udc->gadget.speed = USB_SPEED_UNKNOWN;
857	udc->suspended = 0;
858
859	for (i = 0; i < NUM_ENDPOINTS; i++) {
860	struct at91_ep *ep = &udc->ep[i];
861
862	ep->stopped = 1;
863	nuke(ep, status: -ESHUTDOWN);
864	}
865	if (driver) {
866	spin_unlock(lock: &udc->lock);
867	usb_gadget_udc_reset(gadget: &udc->gadget, driver);
868	spin_lock(lock: &udc->lock);
869	}
870
871	udc_reinit(udc);
872	}
873
874	static void stop_activity(struct at91_udc *udc)
875	{
876	struct usb_gadget_driver *driver = udc->driver;
877	int i;
878
879	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
880	driver = NULL;
881	udc->gadget.speed = USB_SPEED_UNKNOWN;
882	udc->suspended = 0;
883
884	for (i = 0; i < NUM_ENDPOINTS; i++) {
885	struct at91_ep *ep = &udc->ep[i];
886	ep->stopped = 1;
887	nuke(ep, status: -ESHUTDOWN);
888	}
889	if (driver) {
890	spin_unlock(lock: &udc->lock);
891	driver->disconnect(&udc->gadget);
892	spin_lock(lock: &udc->lock);
893	}
894
895	udc_reinit(udc);
896	}
897
898	static void clk_on(struct at91_udc *udc)
899	{
900	if (udc->clocked)
901	return;
902	udc->clocked = 1;
903
904	clk_enable(clk: udc->iclk);
905	clk_enable(clk: udc->fclk);
906	}
907
908	static void clk_off(struct at91_udc *udc)
909	{
910	if (!udc->clocked)
911	return;
912	udc->clocked = 0;
913	udc->gadget.speed = USB_SPEED_UNKNOWN;
914	clk_disable(clk: udc->fclk);
915	clk_disable(clk: udc->iclk);
916	}
917
918	/*
919	* activate/deactivate link with host; minimize power usage for
920	* inactive links by cutting clocks and transceiver power.
921	*/
922	static void pullup(struct at91_udc *udc, int is_on)
923	{
924	if (!udc->enabled || !udc->vbus)
925	is_on = 0;
926	DBG("%sactive\n", is_on ? "" : "in");
927
928	if (is_on) {
929	clk_on(udc);
930	at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
931	at91_udp_write(udc, AT91_UDP_TXVC, 0);
932	} else {
933	stop_activity(udc);
934	at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
935	at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
936	clk_off(udc);
937	}
938
939	if (udc->caps && udc->caps->pullup)
940	udc->caps->pullup(udc, is_on);
941	}
942
943	/* vbus is here! turn everything on that's ready */
944	static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
945	{
946	struct at91_udc *udc = to_udc(g: gadget);
947	unsigned long flags;
948
949	/* VDBG("vbus %s\n", is_active ? "on" : "off"); */
950	spin_lock_irqsave(&udc->lock, flags);
951	udc->vbus = (is_active != 0);
952	if (udc->driver)
953	pullup(udc, is_on: is_active);
954	else
955	pullup(udc, is_on: 0);
956	spin_unlock_irqrestore(lock: &udc->lock, flags);
957	return 0;
958	}
959
960	static int at91_pullup(struct usb_gadget *gadget, int is_on)
961	{
962	struct at91_udc *udc = to_udc(g: gadget);
963	unsigned long flags;
964
965	spin_lock_irqsave(&udc->lock, flags);
966	udc->enabled = is_on = !!is_on;
967	pullup(udc, is_on);
968	spin_unlock_irqrestore(lock: &udc->lock, flags);
969	return 0;
970	}
971
972	static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
973	{
974	struct at91_udc *udc = to_udc(g: gadget);
975	unsigned long flags;
976
977	spin_lock_irqsave(&udc->lock, flags);
978	gadget->is_selfpowered = (is_on != 0);
979	spin_unlock_irqrestore(lock: &udc->lock, flags);
980	return 0;
981	}
982
983	static int at91_start(struct usb_gadget *gadget,
984	struct usb_gadget_driver *driver);
985	static int at91_stop(struct usb_gadget *gadget);
986
987	static const struct usb_gadget_ops at91_udc_ops = {
988	.get_frame = at91_get_frame,
989	.wakeup = at91_wakeup,
990	.set_selfpowered = at91_set_selfpowered,
991	.vbus_session = at91_vbus_session,
992	.pullup = at91_pullup,
993	.udc_start = at91_start,
994	.udc_stop = at91_stop,
995
996	/*
997	* VBUS-powered devices may also want to support bigger
998	* power budgets after an appropriate SET_CONFIGURATION.
999	*/
1000	/* .vbus_power = at91_vbus_power, */
1001	};
1002
1003	/*-------------------------------------------------------------------------*/
1004
1005	static int handle_ep(struct at91_ep *ep)
1006	{
1007	struct at91_request *req;
1008	u32 __iomem *creg = ep->creg;
1009	u32 csr = __raw_readl(addr: creg);
1010
1011	if (!list_empty(head: &ep->queue))
1012	req = list_entry(ep->queue.next,
1013	struct at91_request, queue);
1014	else
1015	req = NULL;
1016
1017	if (ep->is_in) {
1018	if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1019	csr |= CLR_FX;
1020	csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1021	__raw_writel(val: csr, addr: creg);
1022	}
1023	if (req)
1024	return write_fifo(ep, req);
1025
1026	} else {
1027	if (csr & AT91_UDP_STALLSENT) {
1028	/* STALLSENT bit == ISOERR */
1029	if (ep->is_iso && req)
1030	req->req.status = -EILSEQ;
1031	csr |= CLR_FX;
1032	csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1033	__raw_writel(val: csr, addr: creg);
1034	csr = __raw_readl(addr: creg);
1035	}
1036	if (req && (csr & RX_DATA_READY))
1037	return read_fifo(ep, req);
1038	}
1039	return 0;
1040	}
1041
1042	union setup {
1043	u8 raw[8];
1044	struct usb_ctrlrequest r;
1045	};
1046
1047	static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1048	{
1049	u32 __iomem *creg = ep->creg;
1050	u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1051	unsigned rxcount, i = 0;
1052	u32 tmp;
1053	union setup pkt;
1054	int status = 0;
1055
1056	/* read and ack SETUP; hard-fail for bogus packets */
1057	rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1058	if (likely(rxcount == 8)) {
1059	while (rxcount--)
1060	pkt.raw[i++] = __raw_readb(addr: dreg);
1061	if (pkt.r.bRequestType & USB_DIR_IN) {
1062	csr |= AT91_UDP_DIR;
1063	ep->is_in = 1;
1064	} else {
1065	csr &= ~AT91_UDP_DIR;
1066	ep->is_in = 0;
1067	}
1068	} else {
1069	/* REVISIT this happens sometimes under load; why?? */
1070	ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1071	status = -EINVAL;
1072	}
1073	csr |= CLR_FX;
1074	csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1075	__raw_writel(val: csr, addr: creg);
1076	udc->wait_for_addr_ack = 0;
1077	udc->wait_for_config_ack = 0;
1078	ep->stopped = 0;
1079	if (unlikely(status != 0))
1080	goto stall;
1081
1082	#define w_index le16_to_cpu(pkt.r.wIndex)
1083	#define w_value le16_to_cpu(pkt.r.wValue)
1084	#define w_length le16_to_cpu(pkt.r.wLength)
1085
1086	VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1087	pkt.r.bRequestType, pkt.r.bRequest,
1088	w_value, w_index, w_length);
1089
1090	/*
1091	* A few standard requests get handled here, ones that touch
1092	* hardware ... notably for device and endpoint features.
1093	*/
1094	udc->req_pending = 1;
1095	csr = __raw_readl(addr: creg);
1096	csr |= CLR_FX;
1097	csr &= ~SET_FX;
1098	switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1099
1100	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1101	| USB_REQ_SET_ADDRESS:
1102	__raw_writel(val: csr | AT91_UDP_TXPKTRDY, addr: creg);
1103	udc->addr = w_value;
1104	udc->wait_for_addr_ack = 1;
1105	udc->req_pending = 0;
1106	/* FADDR is set later, when we ack host STATUS */
1107	return;
1108
1109	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1110	| USB_REQ_SET_CONFIGURATION:
1111	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1112	if (pkt.r.wValue)
1113	udc->wait_for_config_ack = (tmp == 0);
1114	else
1115	udc->wait_for_config_ack = (tmp != 0);
1116	if (udc->wait_for_config_ack)
1117	VDBG("wait for config\n");
1118	/* CONFG is toggled later, if gadget driver succeeds */
1119	break;
1120
1121	/*
1122	* Hosts may set or clear remote wakeup status, and
1123	* devices may report they're VBUS powered.
1124	*/
1125	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1126	| USB_REQ_GET_STATUS:
1127	tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
1128	if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1129	tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1130	PACKET("get device status\n");
1131	__raw_writeb(val: tmp, addr: dreg);
1132	__raw_writeb(val: 0, addr: dreg);
1133	goto write_in;
1134	/* then STATUS starts later, automatically */
1135	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1136	| USB_REQ_SET_FEATURE:
1137	if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1138	goto stall;
1139	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1140	tmp |= AT91_UDP_ESR;
1141	at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1142	goto succeed;
1143	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1144	| USB_REQ_CLEAR_FEATURE:
1145	if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1146	goto stall;
1147	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1148	tmp &= ~AT91_UDP_ESR;
1149	at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1150	goto succeed;
1151
1152	/*
1153	* Interfaces have no feature settings; this is pretty useless.
1154	* we won't even insist the interface exists...
1155	*/
1156	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1157	| USB_REQ_GET_STATUS:
1158	PACKET("get interface status\n");
1159	__raw_writeb(val: 0, addr: dreg);
1160	__raw_writeb(val: 0, addr: dreg);
1161	goto write_in;
1162	/* then STATUS starts later, automatically */
1163	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1164	| USB_REQ_SET_FEATURE:
1165	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1166	| USB_REQ_CLEAR_FEATURE:
1167	goto stall;
1168
1169	/*
1170	* Hosts may clear bulk/intr endpoint halt after the gadget
1171	* driver sets it (not widely used); or set it (for testing)
1172	*/
1173	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1174	| USB_REQ_GET_STATUS:
1175	tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1176	ep = &udc->ep[tmp];
1177	if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1178	goto stall;
1179
1180	if (tmp) {
1181	if ((w_index & USB_DIR_IN)) {
1182	if (!ep->is_in)
1183	goto stall;
1184	} else if (ep->is_in)
1185	goto stall;
1186	}
1187	PACKET("get %s status\n", ep->ep.name);
1188	if (__raw_readl(addr: ep->creg) & AT91_UDP_FORCESTALL)
1189	tmp = (1 << USB_ENDPOINT_HALT);
1190	else
1191	tmp = 0;
1192	__raw_writeb(val: tmp, addr: dreg);
1193	__raw_writeb(val: 0, addr: dreg);
1194	goto write_in;
1195	/* then STATUS starts later, automatically */
1196	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1197	| USB_REQ_SET_FEATURE:
1198	tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1199	ep = &udc->ep[tmp];
1200	if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1201	goto stall;
1202	if (!ep->ep.desc || ep->is_iso)
1203	goto stall;
1204	if ((w_index & USB_DIR_IN)) {
1205	if (!ep->is_in)
1206	goto stall;
1207	} else if (ep->is_in)
1208	goto stall;
1209
1210	tmp = __raw_readl(addr: ep->creg);
1211	tmp &= ~SET_FX;
1212	tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1213	__raw_writel(val: tmp, addr: ep->creg);
1214	goto succeed;
1215	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1216	| USB_REQ_CLEAR_FEATURE:
1217	tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1218	ep = &udc->ep[tmp];
1219	if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1220	goto stall;
1221	if (tmp == 0)
1222	goto succeed;
1223	if (!ep->ep.desc || ep->is_iso)
1224	goto stall;
1225	if ((w_index & USB_DIR_IN)) {
1226	if (!ep->is_in)
1227	goto stall;
1228	} else if (ep->is_in)
1229	goto stall;
1230
1231	at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1232	at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1233	tmp = __raw_readl(addr: ep->creg);
1234	tmp |= CLR_FX;
1235	tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1236	__raw_writel(val: tmp, addr: ep->creg);
1237	if (!list_empty(head: &ep->queue))
1238	handle_ep(ep);
1239	goto succeed;
1240	}
1241
1242	#undef w_value
1243	#undef w_index
1244	#undef w_length
1245
1246	/* pass request up to the gadget driver */
1247	if (udc->driver) {
1248	spin_unlock(lock: &udc->lock);
1249	status = udc->driver->setup(&udc->gadget, &pkt.r);
1250	spin_lock(lock: &udc->lock);
1251	}
1252	else
1253	status = -ENODEV;
1254	if (status < 0) {
1255	stall:
1256	VDBG("req %02x.%02x protocol STALL; stat %d\n",
1257	pkt.r.bRequestType, pkt.r.bRequest, status);
1258	csr |= AT91_UDP_FORCESTALL;
1259	__raw_writel(val: csr, addr: creg);
1260	udc->req_pending = 0;
1261	}
1262	return;
1263
1264	succeed:
1265	/* immediate successful (IN) STATUS after zero length DATA */
1266	PACKET("ep0 in/status\n");
1267	write_in:
1268	csr |= AT91_UDP_TXPKTRDY;
1269	__raw_writel(val: csr, addr: creg);
1270	udc->req_pending = 0;
1271	}
1272
1273	static void handle_ep0(struct at91_udc *udc)
1274	{
1275	struct at91_ep *ep0 = &udc->ep[0];
1276	u32 __iomem *creg = ep0->creg;
1277	u32 csr = __raw_readl(addr: creg);
1278	struct at91_request *req;
1279
1280	if (unlikely(csr & AT91_UDP_STALLSENT)) {
1281	nuke(ep: ep0, status: -EPROTO);
1282	udc->req_pending = 0;
1283	csr |= CLR_FX;
1284	csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1285	__raw_writel(val: csr, addr: creg);
1286	VDBG("ep0 stalled\n");
1287	csr = __raw_readl(addr: creg);
1288	}
1289	if (csr & AT91_UDP_RXSETUP) {
1290	nuke(ep: ep0, status: 0);
1291	udc->req_pending = 0;
1292	handle_setup(udc, ep: ep0, csr);
1293	return;
1294	}
1295
1296	if (list_empty(head: &ep0->queue))
1297	req = NULL;
1298	else
1299	req = list_entry(ep0->queue.next, struct at91_request, queue);
1300
1301	/* host ACKed an IN packet that we sent */
1302	if (csr & AT91_UDP_TXCOMP) {
1303	csr |= CLR_FX;
1304	csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1305
1306	/* write more IN DATA? */
1307	if (req && ep0->is_in) {
1308	if (handle_ep(ep: ep0))
1309	udc->req_pending = 0;
1310
1311	/*
1312	* Ack after:
1313	* - last IN DATA packet (including GET_STATUS)
1314	* - IN/STATUS for OUT DATA
1315	* - IN/STATUS for any zero-length DATA stage
1316	* except for the IN DATA case, the host should send
1317	* an OUT status later, which we'll ack.
1318	*/
1319	} else {
1320	udc->req_pending = 0;
1321	__raw_writel(val: csr, addr: creg);
1322
1323	/*
1324	* SET_ADDRESS takes effect only after the STATUS
1325	* (to the original address) gets acked.
1326	*/
1327	if (udc->wait_for_addr_ack) {
1328	u32 tmp;
1329
1330	at91_udp_write(udc, AT91_UDP_FADDR,
1331	AT91_UDP_FEN | udc->addr);
1332	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1333	tmp &= ~AT91_UDP_FADDEN;
1334	if (udc->addr)
1335	tmp |= AT91_UDP_FADDEN;
1336	at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1337
1338	udc->wait_for_addr_ack = 0;
1339	VDBG("address %d\n", udc->addr);
1340	}
1341	}
1342	}
1343
1344	/* OUT packet arrived ... */
1345	else if (csr & AT91_UDP_RX_DATA_BK0) {
1346	csr |= CLR_FX;
1347	csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1348
1349	/* OUT DATA stage */
1350	if (!ep0->is_in) {
1351	if (req) {
1352	if (handle_ep(ep: ep0)) {
1353	/* send IN/STATUS */
1354	PACKET("ep0 in/status\n");
1355	csr = __raw_readl(addr: creg);
1356	csr &= ~SET_FX;
1357	csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1358	__raw_writel(val: csr, addr: creg);
1359	udc->req_pending = 0;
1360	}
1361	} else if (udc->req_pending) {
1362	/*
1363	* AT91 hardware has a hard time with this
1364	* "deferred response" mode for control-OUT
1365	* transfers. (For control-IN it's fine.)
1366	*
1367	* The normal solution leaves OUT data in the
1368	* fifo until the gadget driver is ready.
1369	* We couldn't do that here without disabling
1370	* the IRQ that tells about SETUP packets,
1371	* e.g. when the host gets impatient...
1372	*
1373	* Working around it by copying into a buffer
1374	* would almost be a non-deferred response,
1375	* except that it wouldn't permit reliable
1376	* stalling of the request. Instead, demand
1377	* that gadget drivers not use this mode.
1378	*/
1379	DBG("no control-OUT deferred responses!\n");
1380	__raw_writel(val: csr | AT91_UDP_FORCESTALL, addr: creg);
1381	udc->req_pending = 0;
1382	}
1383
1384	/* STATUS stage for control-IN; ack. */
1385	} else {
1386	PACKET("ep0 out/status ACK\n");
1387	__raw_writel(val: csr, addr: creg);
1388
1389	/* "early" status stage */
1390	if (req)
1391	done(ep: ep0, req, status: 0);
1392	}
1393	}
1394	}
1395
1396	static irqreturn_t at91_udc_irq (int irq, void *_udc)
1397	{
1398	struct at91_udc *udc = _udc;
1399	u32 rescans = 5;
1400	int disable_clock = 0;
1401	unsigned long flags;
1402
1403	spin_lock_irqsave(&udc->lock, flags);
1404
1405	if (!udc->clocked) {
1406	clk_on(udc);
1407	disable_clock = 1;
1408	}
1409
1410	while (rescans--) {
1411	u32 status;
1412
1413	status = at91_udp_read(udc, AT91_UDP_ISR)
1414	& at91_udp_read(udc, AT91_UDP_IMR);
1415	if (!status)
1416	break;
1417
1418	/* USB reset irq: not maskable */
1419	if (status & AT91_UDP_ENDBUSRES) {
1420	at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1421	at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1422	/* Atmel code clears this irq twice */
1423	at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1424	at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1425	VDBG("end bus reset\n");
1426	udc->addr = 0;
1427	reset_gadget(udc);
1428
1429	/* enable ep0 */
1430	at91_udp_write(udc, AT91_UDP_CSR(0),
1431	AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1432	udc->gadget.speed = USB_SPEED_FULL;
1433	udc->suspended = 0;
1434	at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1435
1436	/*
1437	* NOTE: this driver keeps clocks off unless the
1438	* USB host is present. That saves power, but for
1439	* boards that don't support VBUS detection, both
1440	* clocks need to be active most of the time.
1441	*/
1442
1443	/* host initiated suspend (3+ms bus idle) */
1444	} else if (status & AT91_UDP_RXSUSP) {
1445	at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1446	at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1447	at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1448	/* VDBG("bus suspend\n"); */
1449	if (udc->suspended)
1450	continue;
1451	udc->suspended = 1;
1452
1453	/*
1454	* NOTE: when suspending a VBUS-powered device, the
1455	* gadget driver should switch into slow clock mode
1456	* and then into standby to avoid drawing more than
1457	* 500uA power (2500uA for some high-power configs).
1458	*/
1459	if (udc->driver && udc->driver->suspend) {
1460	spin_unlock(lock: &udc->lock);
1461	udc->driver->suspend(&udc->gadget);
1462	spin_lock(lock: &udc->lock);
1463	}
1464
1465	/* host initiated resume */
1466	} else if (status & AT91_UDP_RXRSM) {
1467	at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1468	at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1469	at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1470	/* VDBG("bus resume\n"); */
1471	if (!udc->suspended)
1472	continue;
1473	udc->suspended = 0;
1474
1475	/*
1476	* NOTE: for a VBUS-powered device, the gadget driver
1477	* would normally want to switch out of slow clock
1478	* mode into normal mode.
1479	*/
1480	if (udc->driver && udc->driver->resume) {
1481	spin_unlock(lock: &udc->lock);
1482	udc->driver->resume(&udc->gadget);
1483	spin_lock(lock: &udc->lock);
1484	}
1485
1486	/* endpoint IRQs are cleared by handling them */
1487	} else {
1488	int i;
1489	unsigned mask = 1;
1490	struct at91_ep *ep = &udc->ep[1];
1491
1492	if (status & mask)
1493	handle_ep0(udc);
1494	for (i = 1; i < NUM_ENDPOINTS; i++) {
1495	mask <<= 1;
1496	if (status & mask)
1497	handle_ep(ep);
1498	ep++;
1499	}
1500	}
1501	}
1502
1503	if (disable_clock)
1504	clk_off(udc);
1505
1506	spin_unlock_irqrestore(lock: &udc->lock, flags);
1507
1508	return IRQ_HANDLED;
1509	}
1510
1511	/*-------------------------------------------------------------------------*/
1512
1513	static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1514	{
1515	if (value != udc->vbus)
1516	at91_vbus_session(gadget: &udc->gadget, is_active: value);
1517	}
1518
1519	static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1520	{
1521	struct at91_udc *udc = _udc;
1522
1523	/* vbus needs at least brief debouncing */
1524	udelay(10);
1525	at91_vbus_update(udc, value: gpiod_get_value(desc: udc->board.vbus_pin));
1526
1527	return IRQ_HANDLED;
1528	}
1529
1530	static void at91_vbus_timer_work(struct work_struct *work)
1531	{
1532	struct at91_udc *udc = container_of(work, struct at91_udc,
1533	vbus_timer_work);
1534
1535	at91_vbus_update(udc, value: gpiod_get_value_cansleep(desc: udc->board.vbus_pin));
1536
1537	if (!timer_pending(timer: &udc->vbus_timer))
1538	mod_timer(timer: &udc->vbus_timer, expires: jiffies + VBUS_POLL_TIMEOUT);
1539	}
1540
1541	static void at91_vbus_timer(struct timer_list *t)
1542	{
1543	struct at91_udc *udc = from_timer(udc, t, vbus_timer);
1544
1545	/*
1546	* If we are polling vbus it is likely that the gpio is on an
1547	* bus such as i2c or spi which may sleep, so schedule some work
1548	* to read the vbus gpio
1549	*/
1550	schedule_work(work: &udc->vbus_timer_work);
1551	}
1552
1553	static int at91_start(struct usb_gadget *gadget,
1554	struct usb_gadget_driver *driver)
1555	{
1556	struct at91_udc *udc;
1557
1558	udc = container_of(gadget, struct at91_udc, gadget);
1559	udc->driver = driver;
1560	udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1561	udc->enabled = 1;
1562	udc->gadget.is_selfpowered = 1;
1563
1564	return 0;
1565	}
1566
1567	static int at91_stop(struct usb_gadget *gadget)
1568	{
1569	struct at91_udc *udc;
1570	unsigned long flags;
1571
1572	udc = container_of(gadget, struct at91_udc, gadget);
1573	spin_lock_irqsave(&udc->lock, flags);
1574	udc->enabled = 0;
1575	at91_udp_write(udc, AT91_UDP_IDR, ~0);
1576	spin_unlock_irqrestore(lock: &udc->lock, flags);
1577
1578	udc->driver = NULL;
1579
1580	return 0;
1581	}
1582
1583	/*-------------------------------------------------------------------------*/
1584
1585	static void at91udc_shutdown(struct platform_device *dev)
1586	{
1587	struct at91_udc *udc = platform_get_drvdata(pdev: dev);
1588	unsigned long flags;
1589
1590	/* force disconnect on reboot */
1591	spin_lock_irqsave(&udc->lock, flags);
1592	pullup(udc: platform_get_drvdata(pdev: dev), is_on: 0);
1593	spin_unlock_irqrestore(lock: &udc->lock, flags);
1594	}
1595
1596	static int at91rm9200_udc_init(struct at91_udc *udc)
1597	{
1598	struct at91_ep *ep;
1599	int i;
1600
1601	for (i = 0; i < NUM_ENDPOINTS; i++) {
1602	ep = &udc->ep[i];
1603
1604	switch (i) {
1605	case 0:
1606	case 3:
1607	ep->maxpacket = 8;
1608	break;
1609	case 1 ... 2:
1610	ep->maxpacket = 64;
1611	break;
1612	case 4 ... 5:
1613	ep->maxpacket = 256;
1614	break;
1615	}
1616	}
1617
1618	if (!udc->board.pullup_pin) {
1619	DBG("no D+ pullup?\n");
1620	return -ENODEV;
1621	}
1622
1623	gpiod_direction_output(desc: udc->board.pullup_pin,
1624	value: gpiod_is_active_low(desc: udc->board.pullup_pin));
1625
1626	return 0;
1627	}
1628
1629	static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
1630	{
1631	gpiod_set_value(desc: udc->board.pullup_pin, value: is_on);
1632	}
1633
1634	static const struct at91_udc_caps at91rm9200_udc_caps = {
1635	.init = at91rm9200_udc_init,
1636	.pullup = at91rm9200_udc_pullup,
1637	};
1638
1639	static int at91sam9260_udc_init(struct at91_udc *udc)
1640	{
1641	struct at91_ep *ep;
1642	int i;
1643
1644	for (i = 0; i < NUM_ENDPOINTS; i++) {
1645	ep = &udc->ep[i];
1646
1647	switch (i) {
1648	case 0 ... 3:
1649	ep->maxpacket = 64;
1650	break;
1651	case 4 ... 5:
1652	ep->maxpacket = 512;
1653	break;
1654	}
1655	}
1656
1657	return 0;
1658	}
1659
1660	static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1661	{
1662	u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1663
1664	if (is_on)
1665	txvc |= AT91_UDP_TXVC_PUON;
1666	else
1667	txvc &= ~AT91_UDP_TXVC_PUON;
1668
1669	at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1670	}
1671
1672	static const struct at91_udc_caps at91sam9260_udc_caps = {
1673	.init = at91sam9260_udc_init,
1674	.pullup = at91sam9260_udc_pullup,
1675	};
1676
1677	static int at91sam9261_udc_init(struct at91_udc *udc)
1678	{
1679	struct at91_ep *ep;
1680	int i;
1681
1682	for (i = 0; i < NUM_ENDPOINTS; i++) {
1683	ep = &udc->ep[i];
1684
1685	switch (i) {
1686	case 0:
1687	ep->maxpacket = 8;
1688	break;
1689	case 1 ... 3:
1690	ep->maxpacket = 64;
1691	break;
1692	case 4 ... 5:
1693	ep->maxpacket = 256;
1694	break;
1695	}
1696	}
1697
1698	udc->matrix = syscon_regmap_lookup_by_phandle(np: udc->pdev->dev.of_node,
1699	property: "atmel,matrix");
1700	return PTR_ERR_OR_ZERO(ptr: udc->matrix);
1701	}
1702
1703	static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1704	{
1705	u32 usbpucr = 0;
1706
1707	if (is_on)
1708	usbpucr = AT91_MATRIX_USBPUCR_PUON;
1709
1710	regmap_update_bits(map: udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
1711	AT91_MATRIX_USBPUCR_PUON, val: usbpucr);
1712	}
1713
1714	static const struct at91_udc_caps at91sam9261_udc_caps = {
1715	.init = at91sam9261_udc_init,
1716	.pullup = at91sam9261_udc_pullup,
1717	};
1718
1719	static int at91sam9263_udc_init(struct at91_udc *udc)
1720	{
1721	struct at91_ep *ep;
1722	int i;
1723
1724	for (i = 0; i < NUM_ENDPOINTS; i++) {
1725	ep = &udc->ep[i];
1726
1727	switch (i) {
1728	case 0:
1729	case 1:
1730	case 2:
1731	case 3:
1732	ep->maxpacket = 64;
1733	break;
1734	case 4:
1735	case 5:
1736	ep->maxpacket = 256;
1737	break;
1738	}
1739	}
1740
1741	return 0;
1742	}
1743
1744	static const struct at91_udc_caps at91sam9263_udc_caps = {
1745	.init = at91sam9263_udc_init,
1746	.pullup = at91sam9260_udc_pullup,
1747	};
1748
1749	static const struct of_device_id at91_udc_dt_ids[] = {
1750	{
1751	.compatible = "atmel,at91rm9200-udc",
1752	.data = &at91rm9200_udc_caps,
1753	},
1754	{
1755	.compatible = "atmel,at91sam9260-udc",
1756	.data = &at91sam9260_udc_caps,
1757	},
1758	{
1759	.compatible = "atmel,at91sam9261-udc",
1760	.data = &at91sam9261_udc_caps,
1761	},
1762	{
1763	.compatible = "atmel,at91sam9263-udc",
1764	.data = &at91sam9263_udc_caps,
1765	},
1766	{ /* sentinel */ }
1767	};
1768	MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1769
1770	static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
1771	{
1772	struct at91_udc_data *board = &udc->board;
1773	const struct of_device_id *match;
1774	u32 val;
1775
1776	if (of_property_read_u32(np, propname: "atmel,vbus-polled", out_value: &val) == 0)
1777	board->vbus_polled = 1;
1778
1779	board->vbus_pin = fwnode_gpiod_get_index(of_fwnode_handle(np),
1780	con_id: "atmel,vbus", index: 0, flags: GPIOD_IN,
1781	label: "udc_vbus");
1782	if (IS_ERR(ptr: board->vbus_pin))
1783	board->vbus_pin = NULL;
1784
1785	board->pullup_pin = fwnode_gpiod_get_index(of_fwnode_handle(np),
1786	con_id: "atmel,pullup", index: 0,
1787	flags: GPIOD_ASIS, label: "udc_pullup");
1788	if (IS_ERR(ptr: board->pullup_pin))
1789	board->pullup_pin = NULL;
1790
1791	match = of_match_node(matches: at91_udc_dt_ids, node: np);
1792	if (match)
1793	udc->caps = match->data;
1794	}
1795
1796	static int at91udc_probe(struct platform_device *pdev)
1797	{
1798	struct device *dev = &pdev->dev;
1799	struct at91_udc *udc;
1800	int retval;
1801	struct at91_ep *ep;
1802	int i;
1803
1804	udc = devm_kzalloc(dev, size: sizeof(*udc), GFP_KERNEL);
1805	if (!udc)
1806	return -ENOMEM;
1807
1808	/* init software state */
1809	udc->gadget.dev.parent = dev;
1810	at91udc_of_init(udc, np: pdev->dev.of_node);
1811	udc->pdev = pdev;
1812	udc->enabled = 0;
1813	spin_lock_init(&udc->lock);
1814
1815	udc->gadget.ops = &at91_udc_ops;
1816	udc->gadget.ep0 = &udc->ep[0].ep;
1817	udc->gadget.name = driver_name;
1818	udc->gadget.dev.init_name = "gadget";
1819
1820	for (i = 0; i < NUM_ENDPOINTS; i++) {
1821	ep = &udc->ep[i];
1822	ep->ep.name = ep_info[i].name;
1823	ep->ep.caps = ep_info[i].caps;
1824	ep->ep.ops = &at91_ep_ops;
1825	ep->udc = udc;
1826	ep->int_mask = BIT(i);
1827	if (i != 0 && i != 3)
1828	ep->is_pingpong = 1;
1829	}
1830
1831	udc->udp_baseaddr = devm_platform_ioremap_resource(pdev, index: 0);
1832	if (IS_ERR(ptr: udc->udp_baseaddr))
1833	return PTR_ERR(ptr: udc->udp_baseaddr);
1834
1835	if (udc->caps && udc->caps->init) {
1836	retval = udc->caps->init(udc);
1837	if (retval)
1838	return retval;
1839	}
1840
1841	udc_reinit(udc);
1842
1843	/* get interface and function clocks */
1844	udc->iclk = devm_clk_get(dev, id: "pclk");
1845	if (IS_ERR(ptr: udc->iclk))
1846	return PTR_ERR(ptr: udc->iclk);
1847
1848	udc->fclk = devm_clk_get(dev, id: "hclk");
1849	if (IS_ERR(ptr: udc->fclk))
1850	return PTR_ERR(ptr: udc->fclk);
1851
1852	/* don't do anything until we have both gadget driver and VBUS */
1853	clk_set_rate(clk: udc->fclk, rate: 48000000);
1854	retval = clk_prepare(clk: udc->fclk);
1855	if (retval)
1856	return retval;
1857
1858	retval = clk_prepare_enable(clk: udc->iclk);
1859	if (retval)
1860	goto err_unprepare_fclk;
1861
1862	at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1863	at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1864	/* Clear all pending interrupts - UDP may be used by bootloader. */
1865	at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1866	clk_disable(clk: udc->iclk);
1867
1868	/* request UDC and maybe VBUS irqs */
1869	udc->udp_irq = retval = platform_get_irq(pdev, 0);
1870	if (retval < 0)
1871	goto err_unprepare_iclk;
1872	retval = devm_request_irq(dev, irq: udc->udp_irq, handler: at91_udc_irq, irqflags: 0,
1873	devname: driver_name, dev_id: udc);
1874	if (retval) {
1875	DBG("request irq %d failed\n", udc->udp_irq);
1876	goto err_unprepare_iclk;
1877	}
1878
1879	if (udc->board.vbus_pin) {
1880	gpiod_direction_input(desc: udc->board.vbus_pin);
1881
1882	/*
1883	* Get the initial state of VBUS - we cannot expect
1884	* a pending interrupt.
1885	*/
1886	udc->vbus = gpiod_get_value_cansleep(desc: udc->board.vbus_pin);
1887
1888	if (udc->board.vbus_polled) {
1889	INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1890	timer_setup(&udc->vbus_timer, at91_vbus_timer, 0);
1891	mod_timer(timer: &udc->vbus_timer,
1892	expires: jiffies + VBUS_POLL_TIMEOUT);
1893	} else {
1894	retval = devm_request_irq(dev,
1895	irq: gpiod_to_irq(desc: udc->board.vbus_pin),
1896	handler: at91_vbus_irq, irqflags: 0, devname: driver_name, dev_id: udc);
1897	if (retval) {
1898	DBG("request vbus irq %d failed\n",
1899	desc_to_gpio(udc->board.vbus_pin));
1900	goto err_unprepare_iclk;
1901	}
1902	}
1903	} else {
1904	DBG("no VBUS detection, assuming always-on\n");
1905	udc->vbus = 1;
1906	}
1907	retval = usb_add_gadget_udc(parent: dev, gadget: &udc->gadget);
1908	if (retval)
1909	goto err_unprepare_iclk;
1910	dev_set_drvdata(dev, data: udc);
1911	device_init_wakeup(dev, enable: 1);
1912	create_debug_file(udc);
1913
1914	INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1915	return 0;
1916
1917	err_unprepare_iclk:
1918	clk_unprepare(clk: udc->iclk);
1919	err_unprepare_fclk:
1920	clk_unprepare(clk: udc->fclk);
1921
1922	DBG("%s probe failed, %d\n", driver_name, retval);
1923
1924	return retval;
1925	}
1926
1927	static void at91udc_remove(struct platform_device *pdev)
1928	{
1929	struct at91_udc *udc = platform_get_drvdata(pdev);
1930	unsigned long flags;
1931
1932	DBG("remove\n");
1933
1934	usb_del_gadget_udc(gadget: &udc->gadget);
1935	if (udc->driver) {
1936	dev_err(&pdev->dev,
1937	"Driver still in use but removing anyhow\n");
1938	return;
1939	}
1940
1941	spin_lock_irqsave(&udc->lock, flags);
1942	pullup(udc, is_on: 0);
1943	spin_unlock_irqrestore(lock: &udc->lock, flags);
1944
1945	device_init_wakeup(dev: &pdev->dev, enable: 0);
1946	remove_debug_file(udc);
1947	clk_unprepare(clk: udc->fclk);
1948	clk_unprepare(clk: udc->iclk);
1949	}
1950
1951	#ifdef CONFIG_PM
1952	static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1953	{
1954	struct at91_udc *udc = platform_get_drvdata(pdev);
1955	int wake = udc->driver && device_may_wakeup(dev: &pdev->dev);
1956	unsigned long flags;
1957
1958	/* Unless we can act normally to the host (letting it wake us up
1959	* whenever it has work for us) force disconnect. Wakeup requires
1960	* PLLB for USB events (signaling for reset, wakeup, or incoming
1961	* tokens) and VBUS irqs (on systems which support them).
1962	*/
1963	if ((!udc->suspended && udc->addr)
1964	|| !wake
1965	|| at91_suspend_entering_slow_clock()) {
1966	spin_lock_irqsave(&udc->lock, flags);
1967	pullup(udc, is_on: 0);
1968	wake = 0;
1969	spin_unlock_irqrestore(lock: &udc->lock, flags);
1970	} else
1971	enable_irq_wake(irq: udc->udp_irq);
1972
1973	udc->active_suspend = wake;
1974	if (udc->board.vbus_pin && !udc->board.vbus_polled && wake)
1975	enable_irq_wake(irq: gpiod_to_irq(desc: udc->board.vbus_pin));
1976	return 0;
1977	}
1978
1979	static int at91udc_resume(struct platform_device *pdev)
1980	{
1981	struct at91_udc *udc = platform_get_drvdata(pdev);
1982	unsigned long flags;
1983
1984	if (udc->board.vbus_pin && !udc->board.vbus_polled &&
1985	udc->active_suspend)
1986	disable_irq_wake(irq: gpiod_to_irq(desc: udc->board.vbus_pin));
1987
1988	/* maybe reconnect to host; if so, clocks on */
1989	if (udc->active_suspend)
1990	disable_irq_wake(irq: udc->udp_irq);
1991	else {
1992	spin_lock_irqsave(&udc->lock, flags);
1993	pullup(udc, is_on: 1);
1994	spin_unlock_irqrestore(lock: &udc->lock, flags);
1995	}
1996	return 0;
1997	}
1998	#else
1999	#define at91udc_suspend NULL
2000	#define at91udc_resume NULL
2001	#endif
2002
2003	static struct platform_driver at91_udc_driver = {
2004	.probe = at91udc_probe,
2005	.remove_new = at91udc_remove,
2006	.shutdown = at91udc_shutdown,
2007	.suspend = at91udc_suspend,
2008	.resume = at91udc_resume,
2009	.driver = {
2010	.name = driver_name,
2011	.of_match_table = at91_udc_dt_ids,
2012	},
2013	};
2014
2015	module_platform_driver(at91_udc_driver);
2016
2017	MODULE_DESCRIPTION("AT91 udc driver");
2018	MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2019	MODULE_LICENSE("GPL");
2020	MODULE_ALIAS("platform:at91_udc");
2021