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/of_gpio.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 
proc_ep_show(struct seq_file * s,struct at91_ep * ep)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(ep->creg);
119 
120 	/* NOTE:  not collecting per-endpoint irq statistics... */
121 
122 	seq_printf(s, "\n");
123 	seq_printf(s, "%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(s, "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 (&ep->queue))
151 		seq_printf(s, "\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(s, "\treq %p len %d/%d buf %p\n",
157 				&req->req, length,
158 				req->req.length, req->req.buf);
159 	}
160 	spin_unlock_irqrestore(&udc->lock, flags);
161 }
162 
proc_irq_show(struct seq_file * s,const char * label,u32 mask)163 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
164 {
165 	int i;
166 
167 	seq_printf(s, "%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(s, " ep%d", i);
178 	}
179 	seq_printf(s, "\n");
180 }
181 
proc_udc_show(struct seq_file * s,void * unused)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(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
189 
190 	seq_printf(s, "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(s, "(not clocked)\n");
202 		return 0;
203 	}
204 
205 	tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
206 	seq_printf(s, "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(s, "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(s, "faddr   %03x:%s fadd=%d\n", tmp,
221 		(tmp & AT91_UDP_FEN) ? " fen" : "",
222 		(tmp & AT91_UDP_FADD));
223 
224 	proc_irq_show(s, "imr   ", at91_udp_read(udc, AT91_UDP_IMR));
225 	proc_irq_show(s, "isr   ", at91_udp_read(udc, AT91_UDP_ISR));
226 
227 	if (udc->enabled && udc->vbus) {
228 		proc_ep_show(s, &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 
create_debug_file(struct at91_udc * udc)237 static void create_debug_file(struct at91_udc *udc)
238 {
239 	udc->pde = proc_create_single_data(debug_filename, 0, NULL,
240 			proc_udc_show, udc);
241 }
242 
remove_debug_file(struct at91_udc * udc)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 
create_debug_file(struct at91_udc * udc)251 static inline void create_debug_file(struct at91_udc *udc) {}
remove_debug_file(struct at91_udc * udc)252 static inline void remove_debug_file(struct at91_udc *udc) {}
253 
254 #endif
255 
256 
257 /*-------------------------------------------------------------------------*/
258 
done(struct at91_ep * ep,struct at91_request * req,int status)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(&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(&udc->lock);
274 	usb_gadget_giveback_request(&ep->ep, &req->req);
275 	spin_lock(&udc->lock);
276 	ep->stopped = stopped;
277 
278 	/* ep0 is always ready; other endpoints need a non-empty queue */
279 	if (list_empty(&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 */
read_fifo(struct at91_ep * ep,struct at91_request * req)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(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(csr, 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, 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(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 */
write_fifo(struct at91_ep * ep,struct at91_request * req)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(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(csr, creg);
410 			csr = __raw_readl(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(csr, 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, 0);
450 	return is_last;
451 }
452 
nuke(struct at91_ep * ep,int status)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(&ep->queue))
460 		return;
461 
462 	VDBG("%s %s\n", __func__, ep->ep.name);
463 	while (!list_empty(&ep->queue)) {
464 		req = list_entry(ep->queue.next, struct at91_request, queue);
465 		done(ep, req, status);
466 	}
467 }
468 
469 /*-------------------------------------------------------------------------*/
470 
at91_ep_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)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(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(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(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(tmp, 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(&udc->lock, flags);
546 	return 0;
547 }
548 
at91_ep_disable(struct usb_ep * _ep)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, -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(0, ep->creg);
571 	}
572 
573 	spin_unlock_irqrestore(&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 *
at91_ep_alloc_request(struct usb_ep * _ep,gfp_t gfp_flags)583 at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
584 {
585 	struct at91_request *req;
586 
587 	req = kzalloc(sizeof (struct at91_request), gfp_flags);
588 	if (!req)
589 		return NULL;
590 
591 	INIT_LIST_HEAD(&req->queue);
592 	return &req->req;
593 }
594 
at91_ep_free_request(struct usb_ep * _ep,struct usb_request * _req)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(req);
602 }
603 
at91_ep_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t gfp_flags)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(&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(&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(ep->creg);
675 				tmp &= ~SET_FX;
676 				tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
677 				__raw_writel(tmp, 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 (&req->queue, &ep->queue);
697 		at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
698 	}
699 done:
700 	spin_unlock_irqrestore(&udc->lock, flags);
701 	return (status < 0) ? status : 0;
702 }
703 
at91_ep_dequeue(struct usb_ep * _ep,struct usb_request * _req)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;
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 (req, &ep->queue, queue) {
721 		if (&req->req == _req)
722 			break;
723 	}
724 	if (&req->req != _req) {
725 		spin_unlock_irqrestore(&udc->lock, flags);
726 		return -EINVAL;
727 	}
728 
729 	done(ep, req, -ECONNRESET);
730 	spin_unlock_irqrestore(&udc->lock, flags);
731 	return 0;
732 }
733 
at91_ep_set_halt(struct usb_ep * _ep,int value)734 static int at91_ep_set_halt(struct usb_ep *_ep, int value)
735 {
736 	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
737 	struct at91_udc	*udc = ep->udc;
738 	u32 __iomem	*creg;
739 	u32		csr;
740 	unsigned long	flags;
741 	int		status = 0;
742 
743 	if (!_ep || ep->is_iso || !ep->udc->clocked)
744 		return -EINVAL;
745 
746 	creg = ep->creg;
747 	spin_lock_irqsave(&udc->lock, flags);
748 
749 	csr = __raw_readl(creg);
750 
751 	/*
752 	 * fail with still-busy IN endpoints, ensuring correct sequencing
753 	 * of data tx then stall.  note that the fifo rx bytecount isn't
754 	 * completely accurate as a tx bytecount.
755 	 */
756 	if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
757 		status = -EAGAIN;
758 	else {
759 		csr |= CLR_FX;
760 		csr &= ~SET_FX;
761 		if (value) {
762 			csr |= AT91_UDP_FORCESTALL;
763 			VDBG("halt %s\n", ep->ep.name);
764 		} else {
765 			at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
766 			at91_udp_write(udc, AT91_UDP_RST_EP, 0);
767 			csr &= ~AT91_UDP_FORCESTALL;
768 		}
769 		__raw_writel(csr, creg);
770 	}
771 
772 	spin_unlock_irqrestore(&udc->lock, flags);
773 	return status;
774 }
775 
776 static const struct usb_ep_ops at91_ep_ops = {
777 	.enable		= at91_ep_enable,
778 	.disable	= at91_ep_disable,
779 	.alloc_request	= at91_ep_alloc_request,
780 	.free_request	= at91_ep_free_request,
781 	.queue		= at91_ep_queue,
782 	.dequeue	= at91_ep_dequeue,
783 	.set_halt	= at91_ep_set_halt,
784 	/* there's only imprecise fifo status reporting */
785 };
786 
787 /*-------------------------------------------------------------------------*/
788 
at91_get_frame(struct usb_gadget * gadget)789 static int at91_get_frame(struct usb_gadget *gadget)
790 {
791 	struct at91_udc *udc = to_udc(gadget);
792 
793 	if (!to_udc(gadget)->clocked)
794 		return -EINVAL;
795 	return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
796 }
797 
at91_wakeup(struct usb_gadget * gadget)798 static int at91_wakeup(struct usb_gadget *gadget)
799 {
800 	struct at91_udc	*udc = to_udc(gadget);
801 	u32		glbstate;
802 	unsigned long	flags;
803 
804 	DBG("%s\n", __func__ );
805 	spin_lock_irqsave(&udc->lock, flags);
806 
807 	if (!udc->clocked || !udc->suspended)
808 		goto done;
809 
810 	/* NOTE:  some "early versions" handle ESR differently ... */
811 
812 	glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
813 	if (!(glbstate & AT91_UDP_ESR))
814 		goto done;
815 	glbstate |= AT91_UDP_ESR;
816 	at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
817 
818 done:
819 	spin_unlock_irqrestore(&udc->lock, flags);
820 	return 0;
821 }
822 
823 /* reinit == restore initial software state */
udc_reinit(struct at91_udc * udc)824 static void udc_reinit(struct at91_udc *udc)
825 {
826 	u32 i;
827 
828 	INIT_LIST_HEAD(&udc->gadget.ep_list);
829 	INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
830 	udc->gadget.quirk_stall_not_supp = 1;
831 
832 	for (i = 0; i < NUM_ENDPOINTS; i++) {
833 		struct at91_ep *ep = &udc->ep[i];
834 
835 		if (i != 0)
836 			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
837 		ep->ep.desc = NULL;
838 		ep->stopped = 0;
839 		ep->fifo_bank = 0;
840 		usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
841 		ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
842 		/* initialize one queue per endpoint */
843 		INIT_LIST_HEAD(&ep->queue);
844 	}
845 }
846 
reset_gadget(struct at91_udc * udc)847 static void reset_gadget(struct at91_udc *udc)
848 {
849 	struct usb_gadget_driver *driver = udc->driver;
850 	int i;
851 
852 	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
853 		driver = NULL;
854 	udc->gadget.speed = USB_SPEED_UNKNOWN;
855 	udc->suspended = 0;
856 
857 	for (i = 0; i < NUM_ENDPOINTS; i++) {
858 		struct at91_ep *ep = &udc->ep[i];
859 
860 		ep->stopped = 1;
861 		nuke(ep, -ESHUTDOWN);
862 	}
863 	if (driver) {
864 		spin_unlock(&udc->lock);
865 		usb_gadget_udc_reset(&udc->gadget, driver);
866 		spin_lock(&udc->lock);
867 	}
868 
869 	udc_reinit(udc);
870 }
871 
stop_activity(struct at91_udc * udc)872 static void stop_activity(struct at91_udc *udc)
873 {
874 	struct usb_gadget_driver *driver = udc->driver;
875 	int i;
876 
877 	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
878 		driver = NULL;
879 	udc->gadget.speed = USB_SPEED_UNKNOWN;
880 	udc->suspended = 0;
881 
882 	for (i = 0; i < NUM_ENDPOINTS; i++) {
883 		struct at91_ep *ep = &udc->ep[i];
884 		ep->stopped = 1;
885 		nuke(ep, -ESHUTDOWN);
886 	}
887 	if (driver) {
888 		spin_unlock(&udc->lock);
889 		driver->disconnect(&udc->gadget);
890 		spin_lock(&udc->lock);
891 	}
892 
893 	udc_reinit(udc);
894 }
895 
clk_on(struct at91_udc * udc)896 static void clk_on(struct at91_udc *udc)
897 {
898 	if (udc->clocked)
899 		return;
900 	udc->clocked = 1;
901 
902 	clk_enable(udc->iclk);
903 	clk_enable(udc->fclk);
904 }
905 
clk_off(struct at91_udc * udc)906 static void clk_off(struct at91_udc *udc)
907 {
908 	if (!udc->clocked)
909 		return;
910 	udc->clocked = 0;
911 	udc->gadget.speed = USB_SPEED_UNKNOWN;
912 	clk_disable(udc->fclk);
913 	clk_disable(udc->iclk);
914 }
915 
916 /*
917  * activate/deactivate link with host; minimize power usage for
918  * inactive links by cutting clocks and transceiver power.
919  */
pullup(struct at91_udc * udc,int is_on)920 static void pullup(struct at91_udc *udc, int is_on)
921 {
922 	if (!udc->enabled || !udc->vbus)
923 		is_on = 0;
924 	DBG("%sactive\n", is_on ? "" : "in");
925 
926 	if (is_on) {
927 		clk_on(udc);
928 		at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
929 		at91_udp_write(udc, AT91_UDP_TXVC, 0);
930 	} else {
931 		stop_activity(udc);
932 		at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
933 		at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
934 		clk_off(udc);
935 	}
936 
937 	if (udc->caps && udc->caps->pullup)
938 		udc->caps->pullup(udc, is_on);
939 }
940 
941 /* vbus is here!  turn everything on that's ready */
at91_vbus_session(struct usb_gadget * gadget,int is_active)942 static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
943 {
944 	struct at91_udc	*udc = to_udc(gadget);
945 	unsigned long	flags;
946 
947 	/* VDBG("vbus %s\n", is_active ? "on" : "off"); */
948 	spin_lock_irqsave(&udc->lock, flags);
949 	udc->vbus = (is_active != 0);
950 	if (udc->driver)
951 		pullup(udc, is_active);
952 	else
953 		pullup(udc, 0);
954 	spin_unlock_irqrestore(&udc->lock, flags);
955 	return 0;
956 }
957 
at91_pullup(struct usb_gadget * gadget,int is_on)958 static int at91_pullup(struct usb_gadget *gadget, int is_on)
959 {
960 	struct at91_udc	*udc = to_udc(gadget);
961 	unsigned long	flags;
962 
963 	spin_lock_irqsave(&udc->lock, flags);
964 	udc->enabled = is_on = !!is_on;
965 	pullup(udc, is_on);
966 	spin_unlock_irqrestore(&udc->lock, flags);
967 	return 0;
968 }
969 
at91_set_selfpowered(struct usb_gadget * gadget,int is_on)970 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
971 {
972 	struct at91_udc	*udc = to_udc(gadget);
973 	unsigned long	flags;
974 
975 	spin_lock_irqsave(&udc->lock, flags);
976 	gadget->is_selfpowered = (is_on != 0);
977 	spin_unlock_irqrestore(&udc->lock, flags);
978 	return 0;
979 }
980 
981 static int at91_start(struct usb_gadget *gadget,
982 		struct usb_gadget_driver *driver);
983 static int at91_stop(struct usb_gadget *gadget);
984 
985 static const struct usb_gadget_ops at91_udc_ops = {
986 	.get_frame		= at91_get_frame,
987 	.wakeup			= at91_wakeup,
988 	.set_selfpowered	= at91_set_selfpowered,
989 	.vbus_session		= at91_vbus_session,
990 	.pullup			= at91_pullup,
991 	.udc_start		= at91_start,
992 	.udc_stop		= at91_stop,
993 
994 	/*
995 	 * VBUS-powered devices may also also want to support bigger
996 	 * power budgets after an appropriate SET_CONFIGURATION.
997 	 */
998 	/* .vbus_power		= at91_vbus_power, */
999 };
1000 
1001 /*-------------------------------------------------------------------------*/
1002 
handle_ep(struct at91_ep * ep)1003 static int handle_ep(struct at91_ep *ep)
1004 {
1005 	struct at91_request	*req;
1006 	u32 __iomem		*creg = ep->creg;
1007 	u32			csr = __raw_readl(creg);
1008 
1009 	if (!list_empty(&ep->queue))
1010 		req = list_entry(ep->queue.next,
1011 			struct at91_request, queue);
1012 	else
1013 		req = NULL;
1014 
1015 	if (ep->is_in) {
1016 		if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1017 			csr |= CLR_FX;
1018 			csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1019 			__raw_writel(csr, creg);
1020 		}
1021 		if (req)
1022 			return write_fifo(ep, req);
1023 
1024 	} else {
1025 		if (csr & AT91_UDP_STALLSENT) {
1026 			/* STALLSENT bit == ISOERR */
1027 			if (ep->is_iso && req)
1028 				req->req.status = -EILSEQ;
1029 			csr |= CLR_FX;
1030 			csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1031 			__raw_writel(csr, creg);
1032 			csr = __raw_readl(creg);
1033 		}
1034 		if (req && (csr & RX_DATA_READY))
1035 			return read_fifo(ep, req);
1036 	}
1037 	return 0;
1038 }
1039 
1040 union setup {
1041 	u8			raw[8];
1042 	struct usb_ctrlrequest	r;
1043 };
1044 
handle_setup(struct at91_udc * udc,struct at91_ep * ep,u32 csr)1045 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1046 {
1047 	u32 __iomem	*creg = ep->creg;
1048 	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1049 	unsigned	rxcount, i = 0;
1050 	u32		tmp;
1051 	union setup	pkt;
1052 	int		status = 0;
1053 
1054 	/* read and ack SETUP; hard-fail for bogus packets */
1055 	rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1056 	if (likely(rxcount == 8)) {
1057 		while (rxcount--)
1058 			pkt.raw[i++] = __raw_readb(dreg);
1059 		if (pkt.r.bRequestType & USB_DIR_IN) {
1060 			csr |= AT91_UDP_DIR;
1061 			ep->is_in = 1;
1062 		} else {
1063 			csr &= ~AT91_UDP_DIR;
1064 			ep->is_in = 0;
1065 		}
1066 	} else {
1067 		/* REVISIT this happens sometimes under load; why?? */
1068 		ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1069 		status = -EINVAL;
1070 	}
1071 	csr |= CLR_FX;
1072 	csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1073 	__raw_writel(csr, creg);
1074 	udc->wait_for_addr_ack = 0;
1075 	udc->wait_for_config_ack = 0;
1076 	ep->stopped = 0;
1077 	if (unlikely(status != 0))
1078 		goto stall;
1079 
1080 #define w_index		le16_to_cpu(pkt.r.wIndex)
1081 #define w_value		le16_to_cpu(pkt.r.wValue)
1082 #define w_length	le16_to_cpu(pkt.r.wLength)
1083 
1084 	VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1085 			pkt.r.bRequestType, pkt.r.bRequest,
1086 			w_value, w_index, w_length);
1087 
1088 	/*
1089 	 * A few standard requests get handled here, ones that touch
1090 	 * hardware ... notably for device and endpoint features.
1091 	 */
1092 	udc->req_pending = 1;
1093 	csr = __raw_readl(creg);
1094 	csr |= CLR_FX;
1095 	csr &= ~SET_FX;
1096 	switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1097 
1098 	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1099 			| USB_REQ_SET_ADDRESS:
1100 		__raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1101 		udc->addr = w_value;
1102 		udc->wait_for_addr_ack = 1;
1103 		udc->req_pending = 0;
1104 		/* FADDR is set later, when we ack host STATUS */
1105 		return;
1106 
1107 	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1108 			| USB_REQ_SET_CONFIGURATION:
1109 		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1110 		if (pkt.r.wValue)
1111 			udc->wait_for_config_ack = (tmp == 0);
1112 		else
1113 			udc->wait_for_config_ack = (tmp != 0);
1114 		if (udc->wait_for_config_ack)
1115 			VDBG("wait for config\n");
1116 		/* CONFG is toggled later, if gadget driver succeeds */
1117 		break;
1118 
1119 	/*
1120 	 * Hosts may set or clear remote wakeup status, and
1121 	 * devices may report they're VBUS powered.
1122 	 */
1123 	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1124 			| USB_REQ_GET_STATUS:
1125 		tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
1126 		if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1127 			tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1128 		PACKET("get device status\n");
1129 		__raw_writeb(tmp, dreg);
1130 		__raw_writeb(0, dreg);
1131 		goto write_in;
1132 		/* then STATUS starts later, automatically */
1133 	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1134 			| USB_REQ_SET_FEATURE:
1135 		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1136 			goto stall;
1137 		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1138 		tmp |= AT91_UDP_ESR;
1139 		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1140 		goto succeed;
1141 	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1142 			| USB_REQ_CLEAR_FEATURE:
1143 		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1144 			goto stall;
1145 		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1146 		tmp &= ~AT91_UDP_ESR;
1147 		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1148 		goto succeed;
1149 
1150 	/*
1151 	 * Interfaces have no feature settings; this is pretty useless.
1152 	 * we won't even insist the interface exists...
1153 	 */
1154 	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1155 			| USB_REQ_GET_STATUS:
1156 		PACKET("get interface status\n");
1157 		__raw_writeb(0, dreg);
1158 		__raw_writeb(0, dreg);
1159 		goto write_in;
1160 		/* then STATUS starts later, automatically */
1161 	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1162 			| USB_REQ_SET_FEATURE:
1163 	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1164 			| USB_REQ_CLEAR_FEATURE:
1165 		goto stall;
1166 
1167 	/*
1168 	 * Hosts may clear bulk/intr endpoint halt after the gadget
1169 	 * driver sets it (not widely used); or set it (for testing)
1170 	 */
1171 	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1172 			| USB_REQ_GET_STATUS:
1173 		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1174 		ep = &udc->ep[tmp];
1175 		if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1176 			goto stall;
1177 
1178 		if (tmp) {
1179 			if ((w_index & USB_DIR_IN)) {
1180 				if (!ep->is_in)
1181 					goto stall;
1182 			} else if (ep->is_in)
1183 				goto stall;
1184 		}
1185 		PACKET("get %s status\n", ep->ep.name);
1186 		if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1187 			tmp = (1 << USB_ENDPOINT_HALT);
1188 		else
1189 			tmp = 0;
1190 		__raw_writeb(tmp, dreg);
1191 		__raw_writeb(0, dreg);
1192 		goto write_in;
1193 		/* then STATUS starts later, automatically */
1194 	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1195 			| USB_REQ_SET_FEATURE:
1196 		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1197 		ep = &udc->ep[tmp];
1198 		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1199 			goto stall;
1200 		if (!ep->ep.desc || ep->is_iso)
1201 			goto stall;
1202 		if ((w_index & USB_DIR_IN)) {
1203 			if (!ep->is_in)
1204 				goto stall;
1205 		} else if (ep->is_in)
1206 			goto stall;
1207 
1208 		tmp = __raw_readl(ep->creg);
1209 		tmp &= ~SET_FX;
1210 		tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1211 		__raw_writel(tmp, ep->creg);
1212 		goto succeed;
1213 	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1214 			| USB_REQ_CLEAR_FEATURE:
1215 		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1216 		ep = &udc->ep[tmp];
1217 		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1218 			goto stall;
1219 		if (tmp == 0)
1220 			goto succeed;
1221 		if (!ep->ep.desc || ep->is_iso)
1222 			goto stall;
1223 		if ((w_index & USB_DIR_IN)) {
1224 			if (!ep->is_in)
1225 				goto stall;
1226 		} else if (ep->is_in)
1227 			goto stall;
1228 
1229 		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1230 		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1231 		tmp = __raw_readl(ep->creg);
1232 		tmp |= CLR_FX;
1233 		tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1234 		__raw_writel(tmp, ep->creg);
1235 		if (!list_empty(&ep->queue))
1236 			handle_ep(ep);
1237 		goto succeed;
1238 	}
1239 
1240 #undef w_value
1241 #undef w_index
1242 #undef w_length
1243 
1244 	/* pass request up to the gadget driver */
1245 	if (udc->driver) {
1246 		spin_unlock(&udc->lock);
1247 		status = udc->driver->setup(&udc->gadget, &pkt.r);
1248 		spin_lock(&udc->lock);
1249 	}
1250 	else
1251 		status = -ENODEV;
1252 	if (status < 0) {
1253 stall:
1254 		VDBG("req %02x.%02x protocol STALL; stat %d\n",
1255 				pkt.r.bRequestType, pkt.r.bRequest, status);
1256 		csr |= AT91_UDP_FORCESTALL;
1257 		__raw_writel(csr, creg);
1258 		udc->req_pending = 0;
1259 	}
1260 	return;
1261 
1262 succeed:
1263 	/* immediate successful (IN) STATUS after zero length DATA */
1264 	PACKET("ep0 in/status\n");
1265 write_in:
1266 	csr |= AT91_UDP_TXPKTRDY;
1267 	__raw_writel(csr, creg);
1268 	udc->req_pending = 0;
1269 }
1270 
handle_ep0(struct at91_udc * udc)1271 static void handle_ep0(struct at91_udc *udc)
1272 {
1273 	struct at91_ep		*ep0 = &udc->ep[0];
1274 	u32 __iomem		*creg = ep0->creg;
1275 	u32			csr = __raw_readl(creg);
1276 	struct at91_request	*req;
1277 
1278 	if (unlikely(csr & AT91_UDP_STALLSENT)) {
1279 		nuke(ep0, -EPROTO);
1280 		udc->req_pending = 0;
1281 		csr |= CLR_FX;
1282 		csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1283 		__raw_writel(csr, creg);
1284 		VDBG("ep0 stalled\n");
1285 		csr = __raw_readl(creg);
1286 	}
1287 	if (csr & AT91_UDP_RXSETUP) {
1288 		nuke(ep0, 0);
1289 		udc->req_pending = 0;
1290 		handle_setup(udc, ep0, csr);
1291 		return;
1292 	}
1293 
1294 	if (list_empty(&ep0->queue))
1295 		req = NULL;
1296 	else
1297 		req = list_entry(ep0->queue.next, struct at91_request, queue);
1298 
1299 	/* host ACKed an IN packet that we sent */
1300 	if (csr & AT91_UDP_TXCOMP) {
1301 		csr |= CLR_FX;
1302 		csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1303 
1304 		/* write more IN DATA? */
1305 		if (req && ep0->is_in) {
1306 			if (handle_ep(ep0))
1307 				udc->req_pending = 0;
1308 
1309 		/*
1310 		 * Ack after:
1311 		 *  - last IN DATA packet (including GET_STATUS)
1312 		 *  - IN/STATUS for OUT DATA
1313 		 *  - IN/STATUS for any zero-length DATA stage
1314 		 * except for the IN DATA case, the host should send
1315 		 * an OUT status later, which we'll ack.
1316 		 */
1317 		} else {
1318 			udc->req_pending = 0;
1319 			__raw_writel(csr, creg);
1320 
1321 			/*
1322 			 * SET_ADDRESS takes effect only after the STATUS
1323 			 * (to the original address) gets acked.
1324 			 */
1325 			if (udc->wait_for_addr_ack) {
1326 				u32	tmp;
1327 
1328 				at91_udp_write(udc, AT91_UDP_FADDR,
1329 						AT91_UDP_FEN | udc->addr);
1330 				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1331 				tmp &= ~AT91_UDP_FADDEN;
1332 				if (udc->addr)
1333 					tmp |= AT91_UDP_FADDEN;
1334 				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1335 
1336 				udc->wait_for_addr_ack = 0;
1337 				VDBG("address %d\n", udc->addr);
1338 			}
1339 		}
1340 	}
1341 
1342 	/* OUT packet arrived ... */
1343 	else if (csr & AT91_UDP_RX_DATA_BK0) {
1344 		csr |= CLR_FX;
1345 		csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1346 
1347 		/* OUT DATA stage */
1348 		if (!ep0->is_in) {
1349 			if (req) {
1350 				if (handle_ep(ep0)) {
1351 					/* send IN/STATUS */
1352 					PACKET("ep0 in/status\n");
1353 					csr = __raw_readl(creg);
1354 					csr &= ~SET_FX;
1355 					csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1356 					__raw_writel(csr, creg);
1357 					udc->req_pending = 0;
1358 				}
1359 			} else if (udc->req_pending) {
1360 				/*
1361 				 * AT91 hardware has a hard time with this
1362 				 * "deferred response" mode for control-OUT
1363 				 * transfers.  (For control-IN it's fine.)
1364 				 *
1365 				 * The normal solution leaves OUT data in the
1366 				 * fifo until the gadget driver is ready.
1367 				 * We couldn't do that here without disabling
1368 				 * the IRQ that tells about SETUP packets,
1369 				 * e.g. when the host gets impatient...
1370 				 *
1371 				 * Working around it by copying into a buffer
1372 				 * would almost be a non-deferred response,
1373 				 * except that it wouldn't permit reliable
1374 				 * stalling of the request.  Instead, demand
1375 				 * that gadget drivers not use this mode.
1376 				 */
1377 				DBG("no control-OUT deferred responses!\n");
1378 				__raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1379 				udc->req_pending = 0;
1380 			}
1381 
1382 		/* STATUS stage for control-IN; ack.  */
1383 		} else {
1384 			PACKET("ep0 out/status ACK\n");
1385 			__raw_writel(csr, creg);
1386 
1387 			/* "early" status stage */
1388 			if (req)
1389 				done(ep0, req, 0);
1390 		}
1391 	}
1392 }
1393 
at91_udc_irq(int irq,void * _udc)1394 static irqreturn_t at91_udc_irq (int irq, void *_udc)
1395 {
1396 	struct at91_udc		*udc = _udc;
1397 	u32			rescans = 5;
1398 	int			disable_clock = 0;
1399 	unsigned long		flags;
1400 
1401 	spin_lock_irqsave(&udc->lock, flags);
1402 
1403 	if (!udc->clocked) {
1404 		clk_on(udc);
1405 		disable_clock = 1;
1406 	}
1407 
1408 	while (rescans--) {
1409 		u32 status;
1410 
1411 		status = at91_udp_read(udc, AT91_UDP_ISR)
1412 			& at91_udp_read(udc, AT91_UDP_IMR);
1413 		if (!status)
1414 			break;
1415 
1416 		/* USB reset irq:  not maskable */
1417 		if (status & AT91_UDP_ENDBUSRES) {
1418 			at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1419 			at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1420 			/* Atmel code clears this irq twice */
1421 			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1422 			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1423 			VDBG("end bus reset\n");
1424 			udc->addr = 0;
1425 			reset_gadget(udc);
1426 
1427 			/* enable ep0 */
1428 			at91_udp_write(udc, AT91_UDP_CSR(0),
1429 					AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1430 			udc->gadget.speed = USB_SPEED_FULL;
1431 			udc->suspended = 0;
1432 			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1433 
1434 			/*
1435 			 * NOTE:  this driver keeps clocks off unless the
1436 			 * USB host is present.  That saves power, but for
1437 			 * boards that don't support VBUS detection, both
1438 			 * clocks need to be active most of the time.
1439 			 */
1440 
1441 		/* host initiated suspend (3+ms bus idle) */
1442 		} else if (status & AT91_UDP_RXSUSP) {
1443 			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1444 			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1445 			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1446 			/* VDBG("bus suspend\n"); */
1447 			if (udc->suspended)
1448 				continue;
1449 			udc->suspended = 1;
1450 
1451 			/*
1452 			 * NOTE:  when suspending a VBUS-powered device, the
1453 			 * gadget driver should switch into slow clock mode
1454 			 * and then into standby to avoid drawing more than
1455 			 * 500uA power (2500uA for some high-power configs).
1456 			 */
1457 			if (udc->driver && udc->driver->suspend) {
1458 				spin_unlock(&udc->lock);
1459 				udc->driver->suspend(&udc->gadget);
1460 				spin_lock(&udc->lock);
1461 			}
1462 
1463 		/* host initiated resume */
1464 		} else if (status & AT91_UDP_RXRSM) {
1465 			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1466 			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1467 			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1468 			/* VDBG("bus resume\n"); */
1469 			if (!udc->suspended)
1470 				continue;
1471 			udc->suspended = 0;
1472 
1473 			/*
1474 			 * NOTE:  for a VBUS-powered device, the gadget driver
1475 			 * would normally want to switch out of slow clock
1476 			 * mode into normal mode.
1477 			 */
1478 			if (udc->driver && udc->driver->resume) {
1479 				spin_unlock(&udc->lock);
1480 				udc->driver->resume(&udc->gadget);
1481 				spin_lock(&udc->lock);
1482 			}
1483 
1484 		/* endpoint IRQs are cleared by handling them */
1485 		} else {
1486 			int		i;
1487 			unsigned	mask = 1;
1488 			struct at91_ep	*ep = &udc->ep[1];
1489 
1490 			if (status & mask)
1491 				handle_ep0(udc);
1492 			for (i = 1; i < NUM_ENDPOINTS; i++) {
1493 				mask <<= 1;
1494 				if (status & mask)
1495 					handle_ep(ep);
1496 				ep++;
1497 			}
1498 		}
1499 	}
1500 
1501 	if (disable_clock)
1502 		clk_off(udc);
1503 
1504 	spin_unlock_irqrestore(&udc->lock, flags);
1505 
1506 	return IRQ_HANDLED;
1507 }
1508 
1509 /*-------------------------------------------------------------------------*/
1510 
at91_vbus_update(struct at91_udc * udc,unsigned value)1511 static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1512 {
1513 	value ^= udc->board.vbus_active_low;
1514 	if (value != udc->vbus)
1515 		at91_vbus_session(&udc->gadget, value);
1516 }
1517 
at91_vbus_irq(int irq,void * _udc)1518 static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1519 {
1520 	struct at91_udc	*udc = _udc;
1521 
1522 	/* vbus needs at least brief debouncing */
1523 	udelay(10);
1524 	at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1525 
1526 	return IRQ_HANDLED;
1527 }
1528 
at91_vbus_timer_work(struct work_struct * work)1529 static void at91_vbus_timer_work(struct work_struct *work)
1530 {
1531 	struct at91_udc *udc = container_of(work, struct at91_udc,
1532 					    vbus_timer_work);
1533 
1534 	at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1535 
1536 	if (!timer_pending(&udc->vbus_timer))
1537 		mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1538 }
1539 
at91_vbus_timer(struct timer_list * t)1540 static void at91_vbus_timer(struct timer_list *t)
1541 {
1542 	struct at91_udc *udc = from_timer(udc, t, vbus_timer);
1543 
1544 	/*
1545 	 * If we are polling vbus it is likely that the gpio is on an
1546 	 * bus such as i2c or spi which may sleep, so schedule some work
1547 	 * to read the vbus gpio
1548 	 */
1549 	schedule_work(&udc->vbus_timer_work);
1550 }
1551 
at91_start(struct usb_gadget * gadget,struct usb_gadget_driver * driver)1552 static int at91_start(struct usb_gadget *gadget,
1553 		struct usb_gadget_driver *driver)
1554 {
1555 	struct at91_udc	*udc;
1556 
1557 	udc = container_of(gadget, struct at91_udc, gadget);
1558 	udc->driver = driver;
1559 	udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1560 	udc->enabled = 1;
1561 	udc->gadget.is_selfpowered = 1;
1562 
1563 	return 0;
1564 }
1565 
at91_stop(struct usb_gadget * gadget)1566 static int at91_stop(struct usb_gadget *gadget)
1567 {
1568 	struct at91_udc *udc;
1569 	unsigned long	flags;
1570 
1571 	udc = container_of(gadget, struct at91_udc, gadget);
1572 	spin_lock_irqsave(&udc->lock, flags);
1573 	udc->enabled = 0;
1574 	at91_udp_write(udc, AT91_UDP_IDR, ~0);
1575 	spin_unlock_irqrestore(&udc->lock, flags);
1576 
1577 	udc->driver = NULL;
1578 
1579 	return 0;
1580 }
1581 
1582 /*-------------------------------------------------------------------------*/
1583 
at91udc_shutdown(struct platform_device * dev)1584 static void at91udc_shutdown(struct platform_device *dev)
1585 {
1586 	struct at91_udc *udc = platform_get_drvdata(dev);
1587 	unsigned long	flags;
1588 
1589 	/* force disconnect on reboot */
1590 	spin_lock_irqsave(&udc->lock, flags);
1591 	pullup(platform_get_drvdata(dev), 0);
1592 	spin_unlock_irqrestore(&udc->lock, flags);
1593 }
1594 
at91rm9200_udc_init(struct at91_udc * udc)1595 static int at91rm9200_udc_init(struct at91_udc *udc)
1596 {
1597 	struct at91_ep *ep;
1598 	int ret;
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 (!gpio_is_valid(udc->board.pullup_pin)) {
1619 		DBG("no D+ pullup?\n");
1620 		return -ENODEV;
1621 	}
1622 
1623 	ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
1624 				"udc_pullup");
1625 	if (ret) {
1626 		DBG("D+ pullup is busy\n");
1627 		return ret;
1628 	}
1629 
1630 	gpio_direction_output(udc->board.pullup_pin,
1631 			      udc->board.pullup_active_low);
1632 
1633 	return 0;
1634 }
1635 
at91rm9200_udc_pullup(struct at91_udc * udc,int is_on)1636 static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
1637 {
1638 	int active = !udc->board.pullup_active_low;
1639 
1640 	if (is_on)
1641 		gpio_set_value(udc->board.pullup_pin, active);
1642 	else
1643 		gpio_set_value(udc->board.pullup_pin, !active);
1644 }
1645 
1646 static const struct at91_udc_caps at91rm9200_udc_caps = {
1647 	.init = at91rm9200_udc_init,
1648 	.pullup = at91rm9200_udc_pullup,
1649 };
1650 
at91sam9260_udc_init(struct at91_udc * udc)1651 static int at91sam9260_udc_init(struct at91_udc *udc)
1652 {
1653 	struct at91_ep *ep;
1654 	int i;
1655 
1656 	for (i = 0; i < NUM_ENDPOINTS; i++) {
1657 		ep = &udc->ep[i];
1658 
1659 		switch (i) {
1660 		case 0 ... 3:
1661 			ep->maxpacket = 64;
1662 			break;
1663 		case 4 ... 5:
1664 			ep->maxpacket = 512;
1665 			break;
1666 		}
1667 	}
1668 
1669 	return 0;
1670 }
1671 
at91sam9260_udc_pullup(struct at91_udc * udc,int is_on)1672 static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1673 {
1674 	u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1675 
1676 	if (is_on)
1677 		txvc |= AT91_UDP_TXVC_PUON;
1678 	else
1679 		txvc &= ~AT91_UDP_TXVC_PUON;
1680 
1681 	at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1682 }
1683 
1684 static const struct at91_udc_caps at91sam9260_udc_caps = {
1685 	.init = at91sam9260_udc_init,
1686 	.pullup = at91sam9260_udc_pullup,
1687 };
1688 
at91sam9261_udc_init(struct at91_udc * udc)1689 static int at91sam9261_udc_init(struct at91_udc *udc)
1690 {
1691 	struct at91_ep *ep;
1692 	int i;
1693 
1694 	for (i = 0; i < NUM_ENDPOINTS; i++) {
1695 		ep = &udc->ep[i];
1696 
1697 		switch (i) {
1698 		case 0:
1699 			ep->maxpacket = 8;
1700 			break;
1701 		case 1 ... 3:
1702 			ep->maxpacket = 64;
1703 			break;
1704 		case 4 ... 5:
1705 			ep->maxpacket = 256;
1706 			break;
1707 		}
1708 	}
1709 
1710 	udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
1711 						      "atmel,matrix");
1712 	return PTR_ERR_OR_ZERO(udc->matrix);
1713 }
1714 
at91sam9261_udc_pullup(struct at91_udc * udc,int is_on)1715 static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1716 {
1717 	u32 usbpucr = 0;
1718 
1719 	if (is_on)
1720 		usbpucr = AT91_MATRIX_USBPUCR_PUON;
1721 
1722 	regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
1723 			   AT91_MATRIX_USBPUCR_PUON, usbpucr);
1724 }
1725 
1726 static const struct at91_udc_caps at91sam9261_udc_caps = {
1727 	.init = at91sam9261_udc_init,
1728 	.pullup = at91sam9261_udc_pullup,
1729 };
1730 
at91sam9263_udc_init(struct at91_udc * udc)1731 static int at91sam9263_udc_init(struct at91_udc *udc)
1732 {
1733 	struct at91_ep *ep;
1734 	int i;
1735 
1736 	for (i = 0; i < NUM_ENDPOINTS; i++) {
1737 		ep = &udc->ep[i];
1738 
1739 		switch (i) {
1740 		case 0:
1741 		case 1:
1742 		case 2:
1743 		case 3:
1744 			ep->maxpacket = 64;
1745 			break;
1746 		case 4:
1747 		case 5:
1748 			ep->maxpacket = 256;
1749 			break;
1750 		}
1751 	}
1752 
1753 	return 0;
1754 }
1755 
1756 static const struct at91_udc_caps at91sam9263_udc_caps = {
1757 	.init = at91sam9263_udc_init,
1758 	.pullup = at91sam9260_udc_pullup,
1759 };
1760 
1761 static const struct of_device_id at91_udc_dt_ids[] = {
1762 	{
1763 		.compatible = "atmel,at91rm9200-udc",
1764 		.data = &at91rm9200_udc_caps,
1765 	},
1766 	{
1767 		.compatible = "atmel,at91sam9260-udc",
1768 		.data = &at91sam9260_udc_caps,
1769 	},
1770 	{
1771 		.compatible = "atmel,at91sam9261-udc",
1772 		.data = &at91sam9261_udc_caps,
1773 	},
1774 	{
1775 		.compatible = "atmel,at91sam9263-udc",
1776 		.data = &at91sam9263_udc_caps,
1777 	},
1778 	{ /* sentinel */ }
1779 };
1780 MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1781 
at91udc_of_init(struct at91_udc * udc,struct device_node * np)1782 static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
1783 {
1784 	struct at91_udc_data *board = &udc->board;
1785 	const struct of_device_id *match;
1786 	enum of_gpio_flags flags;
1787 	u32 val;
1788 
1789 	if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1790 		board->vbus_polled = 1;
1791 
1792 	board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1793 						  &flags);
1794 	board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1795 
1796 	board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
1797 						  &flags);
1798 
1799 	board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1800 
1801 	match = of_match_node(at91_udc_dt_ids, np);
1802 	if (match)
1803 		udc->caps = match->data;
1804 }
1805 
at91udc_probe(struct platform_device * pdev)1806 static int at91udc_probe(struct platform_device *pdev)
1807 {
1808 	struct device	*dev = &pdev->dev;
1809 	struct at91_udc	*udc;
1810 	int		retval;
1811 	struct at91_ep	*ep;
1812 	int		i;
1813 
1814 	udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
1815 	if (!udc)
1816 		return -ENOMEM;
1817 
1818 	/* init software state */
1819 	udc->gadget.dev.parent = dev;
1820 	at91udc_of_init(udc, pdev->dev.of_node);
1821 	udc->pdev = pdev;
1822 	udc->enabled = 0;
1823 	spin_lock_init(&udc->lock);
1824 
1825 	udc->gadget.ops = &at91_udc_ops;
1826 	udc->gadget.ep0 = &udc->ep[0].ep;
1827 	udc->gadget.name = driver_name;
1828 	udc->gadget.dev.init_name = "gadget";
1829 
1830 	for (i = 0; i < NUM_ENDPOINTS; i++) {
1831 		ep = &udc->ep[i];
1832 		ep->ep.name = ep_info[i].name;
1833 		ep->ep.caps = ep_info[i].caps;
1834 		ep->ep.ops = &at91_ep_ops;
1835 		ep->udc = udc;
1836 		ep->int_mask = BIT(i);
1837 		if (i != 0 && i != 3)
1838 			ep->is_pingpong = 1;
1839 	}
1840 
1841 	udc->udp_baseaddr = devm_platform_ioremap_resource(pdev, 0);
1842 	if (IS_ERR(udc->udp_baseaddr))
1843 		return PTR_ERR(udc->udp_baseaddr);
1844 
1845 	if (udc->caps && udc->caps->init) {
1846 		retval = udc->caps->init(udc);
1847 		if (retval)
1848 			return retval;
1849 	}
1850 
1851 	udc_reinit(udc);
1852 
1853 	/* get interface and function clocks */
1854 	udc->iclk = devm_clk_get(dev, "pclk");
1855 	if (IS_ERR(udc->iclk))
1856 		return PTR_ERR(udc->iclk);
1857 
1858 	udc->fclk = devm_clk_get(dev, "hclk");
1859 	if (IS_ERR(udc->fclk))
1860 		return PTR_ERR(udc->fclk);
1861 
1862 	/* don't do anything until we have both gadget driver and VBUS */
1863 	clk_set_rate(udc->fclk, 48000000);
1864 	retval = clk_prepare(udc->fclk);
1865 	if (retval)
1866 		return retval;
1867 
1868 	retval = clk_prepare_enable(udc->iclk);
1869 	if (retval)
1870 		goto err_unprepare_fclk;
1871 
1872 	at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1873 	at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1874 	/* Clear all pending interrupts - UDP may be used by bootloader. */
1875 	at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1876 	clk_disable(udc->iclk);
1877 
1878 	/* request UDC and maybe VBUS irqs */
1879 	udc->udp_irq = platform_get_irq(pdev, 0);
1880 	retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
1881 				  driver_name, udc);
1882 	if (retval) {
1883 		DBG("request irq %d failed\n", udc->udp_irq);
1884 		goto err_unprepare_iclk;
1885 	}
1886 
1887 	if (gpio_is_valid(udc->board.vbus_pin)) {
1888 		retval = devm_gpio_request(dev, udc->board.vbus_pin,
1889 					   "udc_vbus");
1890 		if (retval) {
1891 			DBG("request vbus pin failed\n");
1892 			goto err_unprepare_iclk;
1893 		}
1894 
1895 		gpio_direction_input(udc->board.vbus_pin);
1896 
1897 		/*
1898 		 * Get the initial state of VBUS - we cannot expect
1899 		 * a pending interrupt.
1900 		 */
1901 		udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1902 			udc->board.vbus_active_low;
1903 
1904 		if (udc->board.vbus_polled) {
1905 			INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1906 			timer_setup(&udc->vbus_timer, at91_vbus_timer, 0);
1907 			mod_timer(&udc->vbus_timer,
1908 				  jiffies + VBUS_POLL_TIMEOUT);
1909 		} else {
1910 			retval = devm_request_irq(dev,
1911 					gpio_to_irq(udc->board.vbus_pin),
1912 					at91_vbus_irq, 0, driver_name, udc);
1913 			if (retval) {
1914 				DBG("request vbus irq %d failed\n",
1915 				    udc->board.vbus_pin);
1916 				goto err_unprepare_iclk;
1917 			}
1918 		}
1919 	} else {
1920 		DBG("no VBUS detection, assuming always-on\n");
1921 		udc->vbus = 1;
1922 	}
1923 	retval = usb_add_gadget_udc(dev, &udc->gadget);
1924 	if (retval)
1925 		goto err_unprepare_iclk;
1926 	dev_set_drvdata(dev, udc);
1927 	device_init_wakeup(dev, 1);
1928 	create_debug_file(udc);
1929 
1930 	INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1931 	return 0;
1932 
1933 err_unprepare_iclk:
1934 	clk_unprepare(udc->iclk);
1935 err_unprepare_fclk:
1936 	clk_unprepare(udc->fclk);
1937 
1938 	DBG("%s probe failed, %d\n", driver_name, retval);
1939 
1940 	return retval;
1941 }
1942 
at91udc_remove(struct platform_device * pdev)1943 static int at91udc_remove(struct platform_device *pdev)
1944 {
1945 	struct at91_udc *udc = platform_get_drvdata(pdev);
1946 	unsigned long	flags;
1947 
1948 	DBG("remove\n");
1949 
1950 	usb_del_gadget_udc(&udc->gadget);
1951 	if (udc->driver)
1952 		return -EBUSY;
1953 
1954 	spin_lock_irqsave(&udc->lock, flags);
1955 	pullup(udc, 0);
1956 	spin_unlock_irqrestore(&udc->lock, flags);
1957 
1958 	device_init_wakeup(&pdev->dev, 0);
1959 	remove_debug_file(udc);
1960 	clk_unprepare(udc->fclk);
1961 	clk_unprepare(udc->iclk);
1962 
1963 	return 0;
1964 }
1965 
1966 #ifdef CONFIG_PM
at91udc_suspend(struct platform_device * pdev,pm_message_t mesg)1967 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1968 {
1969 	struct at91_udc *udc = platform_get_drvdata(pdev);
1970 	int		wake = udc->driver && device_may_wakeup(&pdev->dev);
1971 	unsigned long	flags;
1972 
1973 	/* Unless we can act normally to the host (letting it wake us up
1974 	 * whenever it has work for us) force disconnect.  Wakeup requires
1975 	 * PLLB for USB events (signaling for reset, wakeup, or incoming
1976 	 * tokens) and VBUS irqs (on systems which support them).
1977 	 */
1978 	if ((!udc->suspended && udc->addr)
1979 			|| !wake
1980 			|| at91_suspend_entering_slow_clock()) {
1981 		spin_lock_irqsave(&udc->lock, flags);
1982 		pullup(udc, 0);
1983 		wake = 0;
1984 		spin_unlock_irqrestore(&udc->lock, flags);
1985 	} else
1986 		enable_irq_wake(udc->udp_irq);
1987 
1988 	udc->active_suspend = wake;
1989 	if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
1990 		enable_irq_wake(udc->board.vbus_pin);
1991 	return 0;
1992 }
1993 
at91udc_resume(struct platform_device * pdev)1994 static int at91udc_resume(struct platform_device *pdev)
1995 {
1996 	struct at91_udc *udc = platform_get_drvdata(pdev);
1997 	unsigned long	flags;
1998 
1999 	if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
2000 	    udc->active_suspend)
2001 		disable_irq_wake(udc->board.vbus_pin);
2002 
2003 	/* maybe reconnect to host; if so, clocks on */
2004 	if (udc->active_suspend)
2005 		disable_irq_wake(udc->udp_irq);
2006 	else {
2007 		spin_lock_irqsave(&udc->lock, flags);
2008 		pullup(udc, 1);
2009 		spin_unlock_irqrestore(&udc->lock, flags);
2010 	}
2011 	return 0;
2012 }
2013 #else
2014 #define	at91udc_suspend	NULL
2015 #define	at91udc_resume	NULL
2016 #endif
2017 
2018 static struct platform_driver at91_udc_driver = {
2019 	.remove		= at91udc_remove,
2020 	.shutdown	= at91udc_shutdown,
2021 	.suspend	= at91udc_suspend,
2022 	.resume		= at91udc_resume,
2023 	.driver		= {
2024 		.name	= driver_name,
2025 		.of_match_table	= at91_udc_dt_ids,
2026 	},
2027 };
2028 
2029 module_platform_driver_probe(at91_udc_driver, at91udc_probe);
2030 
2031 MODULE_DESCRIPTION("AT91 udc driver");
2032 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2033 MODULE_LICENSE("GPL");
2034 MODULE_ALIAS("platform:at91_udc");
2035