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lseek(fd, n, SEEK_END) does *not* go to eof - n
[linux-2.6/ubuntu-intrepid-eeepc.git] / drivers / usb / gadget / omap_udc.c
blobb8ed74a823cbb41c6f585fe422483905fc2567ea
1 /*
2 * omap_udc.c -- for OMAP full speed udc; most chips support OTG.
3 *
4 * Copyright (C) 2004 Texas Instruments, Inc.
5 * Copyright (C) 2004-2005 David Brownell
6 *
7 * OMAP2 & DMA support by Kyungmin Park <kyungmin.park@samsung.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
15 #undef DEBUG
16 #undef VERBOSE
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/ioport.h>
21 #include <linux/types.h>
22 #include <linux/errno.h>
23 #include <linux/delay.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/timer.h>
27 #include <linux/list.h>
28 #include <linux/interrupt.h>
29 #include <linux/proc_fs.h>
30 #include <linux/mm.h>
31 #include <linux/moduleparam.h>
32 #include <linux/platform_device.h>
33 #include <linux/usb/ch9.h>
34 #include <linux/usb/gadget.h>
35 #include <linux/usb/otg.h>
36 #include <linux/dma-mapping.h>
37 #include <linux/clk.h>
38 #include <linux/err.h>
39 #include <linux/prefetch.h>
40 #include <linux/io.h>
41
42 #include <asm/byteorder.h>
43 #include <asm/irq.h>
44 #include <asm/unaligned.h>
45 #include <asm/mach-types.h>
46
47 #include <linux/omap-dma.h>
48
49 #include <mach/usb.h>
50
51 #include "omap_udc.h"
52
53 #undef USB_TRACE
54
55 /* bulk DMA seems to be behaving for both IN and OUT */
56 #define USE_DMA
57
58 /* ISO too */
59 #define USE_ISO
60
61 #define DRIVER_DESC "OMAP UDC driver"
62 #define DRIVER_VERSION "4 October 2004"
63
64 #define OMAP_DMA_USB_W2FC_TX0 29
65 #define OMAP_DMA_USB_W2FC_RX0 26
66
67 /*
68 * The OMAP UDC needs _very_ early endpoint setup: before enabling the
69 * D+ pullup to allow enumeration. That's too early for the gadget
70 * framework to use from usb_endpoint_enable(), which happens after
71 * enumeration as part of activating an interface. (But if we add an
72 * optional new "UDC not yet running" state to the gadget driver model,
73 * even just during driver binding, the endpoint autoconfig logic is the
74 * natural spot to manufacture new endpoints.)
75 *
76 * So instead of using endpoint enable calls to control the hardware setup,
77 * this driver defines a "fifo mode" parameter. It's used during driver
78 * initialization to choose among a set of pre-defined endpoint configs.
79 * See omap_udc_setup() for available modes, or to add others. That code
80 * lives in an init section, so use this driver as a module if you need
81 * to change the fifo mode after the kernel boots.
82 *
83 * Gadget drivers normally ignore endpoints they don't care about, and
84 * won't include them in configuration descriptors. That means only
85 * misbehaving hosts would even notice they exist.
86 */
87 #ifdef USE_ISO
88 static unsigned fifo_mode = 3;
89 #else
90 static unsigned fifo_mode;
91 #endif
92
93 /* "modprobe omap_udc fifo_mode=42", or else as a kernel
94 * boot parameter "omap_udc:fifo_mode=42"
95 */
96 module_param(fifo_mode, uint, 0);
97 MODULE_PARM_DESC(fifo_mode, "endpoint configuration");
98
99 #ifdef USE_DMA
100 static bool use_dma = 1;
101
102 /* "modprobe omap_udc use_dma=y", or else as a kernel
103 * boot parameter "omap_udc:use_dma=y"
104 */
105 module_param(use_dma, bool, 0);
106 MODULE_PARM_DESC(use_dma, "enable/disable DMA");
107 #else /* !USE_DMA */
108
109 /* save a bit of code */
110 #define use_dma 0
111 #endif /* !USE_DMA */
112
113
114 static const char driver_name[] = "omap_udc";
115 static const char driver_desc[] = DRIVER_DESC;
116
117 /*-------------------------------------------------------------------------*/
118
119 /* there's a notion of "current endpoint" for modifying endpoint
120 * state, and PIO access to its FIFO.
121 */
122
123 static void use_ep(struct omap_ep *ep, u16 select)
124 {
125 u16 num = ep->bEndpointAddress & 0x0f;
126
127 if (ep->bEndpointAddress & USB_DIR_IN)
128 num |= UDC_EP_DIR;
129 omap_writew(num | select, UDC_EP_NUM);
130 /* when select, MUST deselect later !! */
131 }
132
133 static inline void deselect_ep(void)
134 {
135 u16 w;
136
137 w = omap_readw(UDC_EP_NUM);
138 w &= ~UDC_EP_SEL;
139 omap_writew(w, UDC_EP_NUM);
140 /* 6 wait states before TX will happen */
141 }
142
143 static void dma_channel_claim(struct omap_ep *ep, unsigned preferred);
144
145 /*-------------------------------------------------------------------------*/
146
147 static int omap_ep_enable(struct usb_ep *_ep,
148 const struct usb_endpoint_descriptor *desc)
149 {
150 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
151 struct omap_udc *udc;
152 unsigned long flags;
153 u16 maxp;
154
155 /* catch various bogus parameters */
156 if (!_ep || !desc
157 || desc->bDescriptorType != USB_DT_ENDPOINT
158 || ep->bEndpointAddress != desc->bEndpointAddress
159 || ep->maxpacket < usb_endpoint_maxp(desc)) {
160 DBG("%s, bad ep or descriptor\n", __func__);
161 return -EINVAL;
162 }
163 maxp = usb_endpoint_maxp(desc);
164 if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
165 && maxp != ep->maxpacket)
166 || usb_endpoint_maxp(desc) > ep->maxpacket
167 || !desc->wMaxPacketSize) {
168 DBG("%s, bad %s maxpacket\n", __func__, _ep->name);
169 return -ERANGE;
170 }
171
172 #ifdef USE_ISO
173 if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC
174 && desc->bInterval != 1)) {
175 /* hardware wants period = 1; USB allows 2^(Interval-1) */
176 DBG("%s, unsupported ISO period %dms\n", _ep->name,
177 1 << (desc->bInterval - 1));
178 return -EDOM;
179 }
180 #else
181 if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
182 DBG("%s, ISO nyet\n", _ep->name);
183 return -EDOM;
184 }
185 #endif
186
187 /* xfer types must match, except that interrupt ~= bulk */
188 if (ep->bmAttributes != desc->bmAttributes
189 && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
190 && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
191 DBG("%s, %s type mismatch\n", __func__, _ep->name);
192 return -EINVAL;
193 }
194
195 udc = ep->udc;
196 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
197 DBG("%s, bogus device state\n", __func__);
198 return -ESHUTDOWN;
199 }
200
201 spin_lock_irqsave(&udc->lock, flags);
202
203 ep->ep.desc = desc;
204 ep->irqs = 0;
205 ep->stopped = 0;
206 ep->ep.maxpacket = maxp;
207
208 /* set endpoint to initial state */
209 ep->dma_channel = 0;
210 ep->has_dma = 0;
211 ep->lch = -1;
212 use_ep(ep, UDC_EP_SEL);
213 omap_writew(udc->clr_halt, UDC_CTRL);
214 ep->ackwait = 0;
215 deselect_ep();
216
217 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
218 list_add(&ep->iso, &udc->iso);
219
220 /* maybe assign a DMA channel to this endpoint */
221 if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK)
222 /* FIXME ISO can dma, but prefers first channel */
223 dma_channel_claim(ep, 0);
224
225 /* PIO OUT may RX packets */
226 if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC
227 && !ep->has_dma
228 && !(ep->bEndpointAddress & USB_DIR_IN)) {
229 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
230 ep->ackwait = 1 + ep->double_buf;
231 }
232
233 spin_unlock_irqrestore(&udc->lock, flags);
234 VDBG("%s enabled\n", _ep->name);
235 return 0;
236 }
237
238 static void nuke(struct omap_ep *, int status);
239
240 static int omap_ep_disable(struct usb_ep *_ep)
241 {
242 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
243 unsigned long flags;
244
245 if (!_ep || !ep->ep.desc) {
246 DBG("%s, %s not enabled\n", __func__,
247 _ep ? ep->ep.name : NULL);
248 return -EINVAL;
249 }
250
251 spin_lock_irqsave(&ep->udc->lock, flags);
252 ep->ep.desc = NULL;
253 nuke(ep, -ESHUTDOWN);
254 ep->ep.maxpacket = ep->maxpacket;
255 ep->has_dma = 0;
256 omap_writew(UDC_SET_HALT, UDC_CTRL);
257 list_del_init(&ep->iso);
258 del_timer(&ep->timer);
259
260 spin_unlock_irqrestore(&ep->udc->lock, flags);
261
262 VDBG("%s disabled\n", _ep->name);
263 return 0;
264 }
265
266 /*-------------------------------------------------------------------------*/
267
268 static struct usb_request *
269 omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
270 {
271 struct omap_req *req;
272
273 req = kzalloc(sizeof(*req), gfp_flags);
274 if (!req)
275 return NULL;
276
277 INIT_LIST_HEAD(&req->queue);
278
279 return &req->req;
280 }
281
282 static void
283 omap_free_request(struct usb_ep *ep, struct usb_request *_req)
284 {
285 struct omap_req *req = container_of(_req, struct omap_req, req);
286
287 kfree(req);
288 }
289
290 /*-------------------------------------------------------------------------*/
291
292 static void
293 done(struct omap_ep *ep, struct omap_req *req, int status)
294 {
295 struct omap_udc *udc = ep->udc;
296 unsigned stopped = ep->stopped;
297
298 list_del_init(&req->queue);
299
300 if (req->req.status == -EINPROGRESS)
301 req->req.status = status;
302 else
303 status = req->req.status;
304
305 if (use_dma && ep->has_dma)
306 usb_gadget_unmap_request(&udc->gadget, &req->req,
307 (ep->bEndpointAddress & USB_DIR_IN));
308
309 #ifndef USB_TRACE
310 if (status && status != -ESHUTDOWN)
311 #endif
312 VDBG("complete %s req %p stat %d len %u/%u\n",
313 ep->ep.name, &req->req, status,
314 req->req.actual, req->req.length);
315
316 /* don't modify queue heads during completion callback */
317 ep->stopped = 1;
318 spin_unlock(&ep->udc->lock);
319 req->req.complete(&ep->ep, &req->req);
320 spin_lock(&ep->udc->lock);
321 ep->stopped = stopped;
322 }
323
324 /*-------------------------------------------------------------------------*/
325
326 #define UDC_FIFO_FULL (UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL)
327 #define UDC_FIFO_UNWRITABLE (UDC_EP_HALTED | UDC_FIFO_FULL)
328
329 #define FIFO_EMPTY (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY)
330 #define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY)
331
332 static inline int
333 write_packet(u8 *buf, struct omap_req *req, unsigned max)
334 {
335 unsigned len;
336 u16 *wp;
337
338 len = min(req->req.length - req->req.actual, max);
339 req->req.actual += len;
340
341 max = len;
342 if (likely((((int)buf) & 1) == 0)) {
343 wp = (u16 *)buf;
344 while (max >= 2) {
345 omap_writew(*wp++, UDC_DATA);
346 max -= 2;
347 }
348 buf = (u8 *)wp;
349 }
350 while (max--)
351 omap_writeb(*buf++, UDC_DATA);
352 return len;
353 }
354
355 /* FIXME change r/w fifo calling convention */
356
357
358 /* return: 0 = still running, 1 = completed, negative = errno */
359 static int write_fifo(struct omap_ep *ep, struct omap_req *req)
360 {
361 u8 *buf;
362 unsigned count;
363 int is_last;
364 u16 ep_stat;
365
366 buf = req->req.buf + req->req.actual;
367 prefetch(buf);
368
369 /* PIO-IN isn't double buffered except for iso */
370 ep_stat = omap_readw(UDC_STAT_FLG);
371 if (ep_stat & UDC_FIFO_UNWRITABLE)
372 return 0;
373
374 count = ep->ep.maxpacket;
375 count = write_packet(buf, req, count);
376 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
377 ep->ackwait = 1;
378
379 /* last packet is often short (sometimes a zlp) */
380 if (count != ep->ep.maxpacket)
381 is_last = 1;
382 else if (req->req.length == req->req.actual
383 && !req->req.zero)
384 is_last = 1;
385 else
386 is_last = 0;
387
388 /* NOTE: requests complete when all IN data is in a
389 * FIFO (or sometimes later, if a zlp was needed).
390 * Use usb_ep_fifo_status() where needed.
391 */
392 if (is_last)
393 done(ep, req, 0);
394 return is_last;
395 }
396
397 static inline int
398 read_packet(u8 *buf, struct omap_req *req, unsigned avail)
399 {
400 unsigned len;
401 u16 *wp;
402
403 len = min(req->req.length - req->req.actual, avail);
404 req->req.actual += len;
405 avail = len;
406
407 if (likely((((int)buf) & 1) == 0)) {
408 wp = (u16 *)buf;
409 while (avail >= 2) {
410 *wp++ = omap_readw(UDC_DATA);
411 avail -= 2;
412 }
413 buf = (u8 *)wp;
414 }
415 while (avail--)
416 *buf++ = omap_readb(UDC_DATA);
417 return len;
418 }
419
420 /* return: 0 = still running, 1 = queue empty, negative = errno */
421 static int read_fifo(struct omap_ep *ep, struct omap_req *req)
422 {
423 u8 *buf;
424 unsigned count, avail;
425 int is_last;
426
427 buf = req->req.buf + req->req.actual;
428 prefetchw(buf);
429
430 for (;;) {
431 u16 ep_stat = omap_readw(UDC_STAT_FLG);
432
433 is_last = 0;
434 if (ep_stat & FIFO_EMPTY) {
435 if (!ep->double_buf)
436 break;
437 ep->fnf = 1;
438 }
439 if (ep_stat & UDC_EP_HALTED)
440 break;
441
442 if (ep_stat & UDC_FIFO_FULL)
443 avail = ep->ep.maxpacket;
444 else {
445 avail = omap_readw(UDC_RXFSTAT);
446 ep->fnf = ep->double_buf;
447 }
448 count = read_packet(buf, req, avail);
449
450 /* partial packet reads may not be errors */
451 if (count < ep->ep.maxpacket) {
452 is_last = 1;
453 /* overflowed this request? flush extra data */
454 if (count != avail) {
455 req->req.status = -EOVERFLOW;
456 avail -= count;
457 while (avail--)
458 omap_readw(UDC_DATA);
459 }
460 } else if (req->req.length == req->req.actual)
461 is_last = 1;
462 else
463 is_last = 0;
464
465 if (!ep->bEndpointAddress)
466 break;
467 if (is_last)
468 done(ep, req, 0);
469 break;
470 }
471 return is_last;
472 }
473
474 /*-------------------------------------------------------------------------*/
475
476 static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start)
477 {
478 dma_addr_t end;
479
480 /* IN-DMA needs this on fault/cancel paths, so 15xx misreports
481 * the last transfer's bytecount by more than a FIFO's worth.
482 */
483 if (cpu_is_omap15xx())
484 return 0;
485
486 end = omap_get_dma_src_pos(ep->lch);
487 if (end == ep->dma_counter)
488 return 0;
489
490 end |= start & (0xffff << 16);
491 if (end < start)
492 end += 0x10000;
493 return end - start;
494 }
495
496 static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
497 {
498 dma_addr_t end;
499
500 end = omap_get_dma_dst_pos(ep->lch);
501 if (end == ep->dma_counter)
502 return 0;
503
504 end |= start & (0xffff << 16);
505 if (cpu_is_omap15xx())
506 end++;
507 if (end < start)
508 end += 0x10000;
509 return end - start;
510 }
511
512
513 /* Each USB transfer request using DMA maps to one or more DMA transfers.
514 * When DMA completion isn't request completion, the UDC continues with
515 * the next DMA transfer for that USB transfer.
516 */
517
518 static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
519 {
520 u16 txdma_ctrl, w;
521 unsigned length = req->req.length - req->req.actual;
522 const int sync_mode = cpu_is_omap15xx()
523 ? OMAP_DMA_SYNC_FRAME
524 : OMAP_DMA_SYNC_ELEMENT;
525 int dma_trigger = 0;
526
527 /* measure length in either bytes or packets */
528 if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC)
529 || (cpu_is_omap15xx() && length < ep->maxpacket)) {
530 txdma_ctrl = UDC_TXN_EOT | length;
531 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
532 length, 1, sync_mode, dma_trigger, 0);
533 } else {
534 length = min(length / ep->maxpacket,
535 (unsigned) UDC_TXN_TSC + 1);
536 txdma_ctrl = length;
537 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
538 ep->ep.maxpacket >> 1, length, sync_mode,
539 dma_trigger, 0);
540 length *= ep->maxpacket;
541 }
542 omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF,
543 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
544 0, 0);
545
546 omap_start_dma(ep->lch);
547 ep->dma_counter = omap_get_dma_src_pos(ep->lch);
548 w = omap_readw(UDC_DMA_IRQ_EN);
549 w |= UDC_TX_DONE_IE(ep->dma_channel);
550 omap_writew(w, UDC_DMA_IRQ_EN);
551 omap_writew(UDC_TXN_START | txdma_ctrl, UDC_TXDMA(ep->dma_channel));
552 req->dma_bytes = length;
553 }
554
555 static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
556 {
557 u16 w;
558
559 if (status == 0) {
560 req->req.actual += req->dma_bytes;
561
562 /* return if this request needs to send data or zlp */
563 if (req->req.actual < req->req.length)
564 return;
565 if (req->req.zero
566 && req->dma_bytes != 0
567 && (req->req.actual % ep->maxpacket) == 0)
568 return;
569 } else
570 req->req.actual += dma_src_len(ep, req->req.dma
571 + req->req.actual);
572
573 /* tx completion */
574 omap_stop_dma(ep->lch);
575 w = omap_readw(UDC_DMA_IRQ_EN);
576 w &= ~UDC_TX_DONE_IE(ep->dma_channel);
577 omap_writew(w, UDC_DMA_IRQ_EN);
578 done(ep, req, status);
579 }
580
581 static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
582 {
583 unsigned packets = req->req.length - req->req.actual;
584 int dma_trigger = 0;
585 u16 w;
586
587 /* set up this DMA transfer, enable the fifo, start */
588 packets /= ep->ep.maxpacket;
589 packets = min(packets, (unsigned)UDC_RXN_TC + 1);
590 req->dma_bytes = packets * ep->ep.maxpacket;
591 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
592 ep->ep.maxpacket >> 1, packets,
593 OMAP_DMA_SYNC_ELEMENT,
594 dma_trigger, 0);
595 omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF,
596 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
597 0, 0);
598 ep->dma_counter = omap_get_dma_dst_pos(ep->lch);
599
600 omap_writew(UDC_RXN_STOP | (packets - 1), UDC_RXDMA(ep->dma_channel));
601 w = omap_readw(UDC_DMA_IRQ_EN);
602 w |= UDC_RX_EOT_IE(ep->dma_channel);
603 omap_writew(w, UDC_DMA_IRQ_EN);
604 omap_writew(ep->bEndpointAddress & 0xf, UDC_EP_NUM);
605 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
606
607 omap_start_dma(ep->lch);
608 }
609
610 static void
611 finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one)
612 {
613 u16 count, w;
614
615 if (status == 0)
616 ep->dma_counter = (u16) (req->req.dma + req->req.actual);
617 count = dma_dest_len(ep, req->req.dma + req->req.actual);
618 count += req->req.actual;
619 if (one)
620 count--;
621 if (count <= req->req.length)
622 req->req.actual = count;
623
624 if (count != req->dma_bytes || status)
625 omap_stop_dma(ep->lch);
626
627 /* if this wasn't short, request may need another transfer */
628 else if (req->req.actual < req->req.length)
629 return;
630
631 /* rx completion */
632 w = omap_readw(UDC_DMA_IRQ_EN);
633 w &= ~UDC_RX_EOT_IE(ep->dma_channel);
634 omap_writew(w, UDC_DMA_IRQ_EN);
635 done(ep, req, status);
636 }
637
638 static void dma_irq(struct omap_udc *udc, u16 irq_src)
639 {
640 u16 dman_stat = omap_readw(UDC_DMAN_STAT);
641 struct omap_ep *ep;
642 struct omap_req *req;
643
644 /* IN dma: tx to host */
645 if (irq_src & UDC_TXN_DONE) {
646 ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)];
647 ep->irqs++;
648 /* can see TXN_DONE after dma abort */
649 if (!list_empty(&ep->queue)) {
650 req = container_of(ep->queue.next,
651 struct omap_req, queue);
652 finish_in_dma(ep, req, 0);
653 }
654 omap_writew(UDC_TXN_DONE, UDC_IRQ_SRC);
655
656 if (!list_empty(&ep->queue)) {
657 req = container_of(ep->queue.next,
658 struct omap_req, queue);
659 next_in_dma(ep, req);
660 }
661 }
662
663 /* OUT dma: rx from host */
664 if (irq_src & UDC_RXN_EOT) {
665 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
666 ep->irqs++;
667 /* can see RXN_EOT after dma abort */
668 if (!list_empty(&ep->queue)) {
669 req = container_of(ep->queue.next,
670 struct omap_req, queue);
671 finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB);
672 }
673 omap_writew(UDC_RXN_EOT, UDC_IRQ_SRC);
674
675 if (!list_empty(&ep->queue)) {
676 req = container_of(ep->queue.next,
677 struct omap_req, queue);
678 next_out_dma(ep, req);
679 }
680 }
681
682 if (irq_src & UDC_RXN_CNT) {
683 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
684 ep->irqs++;
685 /* omap15xx does this unasked... */
686 VDBG("%s, RX_CNT irq?\n", ep->ep.name);
687 omap_writew(UDC_RXN_CNT, UDC_IRQ_SRC);
688 }
689 }
690
691 static void dma_error(int lch, u16 ch_status, void *data)
692 {
693 struct omap_ep *ep = data;
694
695 /* if ch_status & OMAP_DMA_DROP_IRQ ... */
696 /* if ch_status & OMAP1_DMA_TOUT_IRQ ... */
697 ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status);
698
699 /* complete current transfer ... */
700 }
701
702 static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
703 {
704 u16 reg;
705 int status, restart, is_in;
706 int dma_channel;
707
708 is_in = ep->bEndpointAddress & USB_DIR_IN;
709 if (is_in)
710 reg = omap_readw(UDC_TXDMA_CFG);
711 else
712 reg = omap_readw(UDC_RXDMA_CFG);
713 reg |= UDC_DMA_REQ; /* "pulse" activated */
714
715 ep->dma_channel = 0;
716 ep->lch = -1;
717 if (channel == 0 || channel > 3) {
718 if ((reg & 0x0f00) == 0)
719 channel = 3;
720 else if ((reg & 0x00f0) == 0)
721 channel = 2;
722 else if ((reg & 0x000f) == 0) /* preferred for ISO */
723 channel = 1;
724 else {
725 status = -EMLINK;
726 goto just_restart;
727 }
728 }
729 reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1));
730 ep->dma_channel = channel;
731
732 if (is_in) {
733 dma_channel = OMAP_DMA_USB_W2FC_TX0 - 1 + channel;
734 status = omap_request_dma(dma_channel,
735 ep->ep.name, dma_error, ep, &ep->lch);
736 if (status == 0) {
737 omap_writew(reg, UDC_TXDMA_CFG);
738 /* EMIFF or SDRC */
739 omap_set_dma_src_burst_mode(ep->lch,
740 OMAP_DMA_DATA_BURST_4);
741 omap_set_dma_src_data_pack(ep->lch, 1);
742 /* TIPB */
743 omap_set_dma_dest_params(ep->lch,
744 OMAP_DMA_PORT_TIPB,
745 OMAP_DMA_AMODE_CONSTANT,
746 UDC_DATA_DMA,
747 0, 0);
748 }
749 } else {
750 dma_channel = OMAP_DMA_USB_W2FC_RX0 - 1 + channel;
751 status = omap_request_dma(dma_channel,
752 ep->ep.name, dma_error, ep, &ep->lch);
753 if (status == 0) {
754 omap_writew(reg, UDC_RXDMA_CFG);
755 /* TIPB */
756 omap_set_dma_src_params(ep->lch,
757 OMAP_DMA_PORT_TIPB,
758 OMAP_DMA_AMODE_CONSTANT,
759 UDC_DATA_DMA,
760 0, 0);
761 /* EMIFF or SDRC */
762 omap_set_dma_dest_burst_mode(ep->lch,
763 OMAP_DMA_DATA_BURST_4);
764 omap_set_dma_dest_data_pack(ep->lch, 1);
765 }
766 }
767 if (status)
768 ep->dma_channel = 0;
769 else {
770 ep->has_dma = 1;
771 omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ);
772
773 /* channel type P: hw synch (fifo) */
774 if (!cpu_is_omap15xx())
775 omap_set_dma_channel_mode(ep->lch, OMAP_DMA_LCH_P);
776 }
777
778 just_restart:
779 /* restart any queue, even if the claim failed */
780 restart = !ep->stopped && !list_empty(&ep->queue);
781
782 if (status)
783 DBG("%s no dma channel: %d%s\n", ep->ep.name, status,
784 restart ? " (restart)" : "");
785 else
786 DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name,
787 is_in ? 't' : 'r',
788 ep->dma_channel - 1, ep->lch,
789 restart ? " (restart)" : "");
790
791 if (restart) {
792 struct omap_req *req;
793 req = container_of(ep->queue.next, struct omap_req, queue);
794 if (ep->has_dma)
795 (is_in ? next_in_dma : next_out_dma)(ep, req);
796 else {
797 use_ep(ep, UDC_EP_SEL);
798 (is_in ? write_fifo : read_fifo)(ep, req);
799 deselect_ep();
800 if (!is_in) {
801 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
802 ep->ackwait = 1 + ep->double_buf;
803 }
804 /* IN: 6 wait states before it'll tx */
805 }
806 }
807 }
808
809 static void dma_channel_release(struct omap_ep *ep)
810 {
811 int shift = 4 * (ep->dma_channel - 1);
812 u16 mask = 0x0f << shift;
813 struct omap_req *req;
814 int active;
815
816 /* abort any active usb transfer request */
817 if (!list_empty(&ep->queue))
818 req = container_of(ep->queue.next, struct omap_req, queue);
819 else
820 req = NULL;
821
822 active = omap_get_dma_active_status(ep->lch);
823
824 DBG("%s release %s %cxdma%d %p\n", ep->ep.name,
825 active ? "active" : "idle",
826 (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
827 ep->dma_channel - 1, req);
828
829 /* NOTE: re-setting RX_REQ/TX_REQ because of a chip bug (before
830 * OMAP 1710 ES2.0) where reading the DMA_CFG can clear them.
831 */
832
833 /* wait till current packet DMA finishes, and fifo empties */
834 if (ep->bEndpointAddress & USB_DIR_IN) {
835 omap_writew((omap_readw(UDC_TXDMA_CFG) & ~mask) | UDC_DMA_REQ,
836 UDC_TXDMA_CFG);
837
838 if (req) {
839 finish_in_dma(ep, req, -ECONNRESET);
840
841 /* clear FIFO; hosts probably won't empty it */
842 use_ep(ep, UDC_EP_SEL);
843 omap_writew(UDC_CLR_EP, UDC_CTRL);
844 deselect_ep();
845 }
846 while (omap_readw(UDC_TXDMA_CFG) & mask)
847 udelay(10);
848 } else {
849 omap_writew((omap_readw(UDC_RXDMA_CFG) & ~mask) | UDC_DMA_REQ,
850 UDC_RXDMA_CFG);
851
852 /* dma empties the fifo */
853 while (omap_readw(UDC_RXDMA_CFG) & mask)
854 udelay(10);
855 if (req)
856 finish_out_dma(ep, req, -ECONNRESET, 0);
857 }
858 omap_free_dma(ep->lch);
859 ep->dma_channel = 0;
860 ep->lch = -1;
861 /* has_dma still set, till endpoint is fully quiesced */
862 }
863
864
865 /*-------------------------------------------------------------------------*/
866
867 static int
868 omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
869 {
870 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
871 struct omap_req *req = container_of(_req, struct omap_req, req);
872 struct omap_udc *udc;
873 unsigned long flags;
874 int is_iso = 0;
875
876 /* catch various bogus parameters */
877 if (!_req || !req->req.complete || !req->req.buf
878 || !list_empty(&req->queue)) {
879 DBG("%s, bad params\n", __func__);
880 return -EINVAL;
881 }
882 if (!_ep || (!ep->ep.desc && ep->bEndpointAddress)) {
883 DBG("%s, bad ep\n", __func__);
884 return -EINVAL;
885 }
886 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
887 if (req->req.length > ep->ep.maxpacket)
888 return -EMSGSIZE;
889 is_iso = 1;
890 }
891
892 /* this isn't bogus, but OMAP DMA isn't the only hardware to
893 * have a hard time with partial packet reads... reject it.
894 */
895 if (use_dma
896 && ep->has_dma
897 && ep->bEndpointAddress != 0
898 && (ep->bEndpointAddress & USB_DIR_IN) == 0
899 && (req->req.length % ep->ep.maxpacket) != 0) {
900 DBG("%s, no partial packet OUT reads\n", __func__);
901 return -EMSGSIZE;
902 }
903
904 udc = ep->udc;
905 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
906 return -ESHUTDOWN;
907
908 if (use_dma && ep->has_dma)
909 usb_gadget_map_request(&udc->gadget, &req->req,
910 (ep->bEndpointAddress & USB_DIR_IN));
911
912 VDBG("%s queue req %p, len %d buf %p\n",
913 ep->ep.name, _req, _req->length, _req->buf);
914
915 spin_lock_irqsave(&udc->lock, flags);
916
917 req->req.status = -EINPROGRESS;
918 req->req.actual = 0;
919
920 /* maybe kickstart non-iso i/o queues */
921 if (is_iso) {
922 u16 w;
923
924 w = omap_readw(UDC_IRQ_EN);
925 w |= UDC_SOF_IE;
926 omap_writew(w, UDC_IRQ_EN);
927 } else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
928 int is_in;
929
930 if (ep->bEndpointAddress == 0) {
931 if (!udc->ep0_pending || !list_empty(&ep->queue)) {
932 spin_unlock_irqrestore(&udc->lock, flags);
933 return -EL2HLT;
934 }
935
936 /* empty DATA stage? */
937 is_in = udc->ep0_in;
938 if (!req->req.length) {
939
940 /* chip became CONFIGURED or ADDRESSED
941 * earlier; drivers may already have queued
942 * requests to non-control endpoints
943 */
944 if (udc->ep0_set_config) {
945 u16 irq_en = omap_readw(UDC_IRQ_EN);
946
947 irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE;
948 if (!udc->ep0_reset_config)
949 irq_en |= UDC_EPN_RX_IE
950 | UDC_EPN_TX_IE;
951 omap_writew(irq_en, UDC_IRQ_EN);
952 }
953
954 /* STATUS for zero length DATA stages is
955 * always an IN ... even for IN transfers,
956 * a weird case which seem to stall OMAP.
957 */
958 omap_writew(UDC_EP_SEL | UDC_EP_DIR,
959 UDC_EP_NUM);
960 omap_writew(UDC_CLR_EP, UDC_CTRL);
961 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
962 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
963
964 /* cleanup */
965 udc->ep0_pending = 0;
966 done(ep, req, 0);
967 req = NULL;
968
969 /* non-empty DATA stage */
970 } else if (is_in) {
971 omap_writew(UDC_EP_SEL | UDC_EP_DIR,
972 UDC_EP_NUM);
973 } else {
974 if (udc->ep0_setup)
975 goto irq_wait;
976 omap_writew(UDC_EP_SEL, UDC_EP_NUM);
977 }
978 } else {
979 is_in = ep->bEndpointAddress & USB_DIR_IN;
980 if (!ep->has_dma)
981 use_ep(ep, UDC_EP_SEL);
982 /* if ISO: SOF IRQs must be enabled/disabled! */
983 }
984
985 if (ep->has_dma)
986 (is_in ? next_in_dma : next_out_dma)(ep, req);
987 else if (req) {
988 if ((is_in ? write_fifo : read_fifo)(ep, req) == 1)
989 req = NULL;
990 deselect_ep();
991 if (!is_in) {
992 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
993 ep->ackwait = 1 + ep->double_buf;
994 }
995 /* IN: 6 wait states before it'll tx */
996 }
997 }
998
999 irq_wait:
1000 /* irq handler advances the queue */
1001 if (req != NULL)
1002 list_add_tail(&req->queue, &ep->queue);
1003 spin_unlock_irqrestore(&udc->lock, flags);
1004
1005 return 0;
1006 }
1007
1008 static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1009 {
1010 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
1011 struct omap_req *req;
1012 unsigned long flags;
1013
1014 if (!_ep || !_req)
1015 return -EINVAL;
1016
1017 spin_lock_irqsave(&ep->udc->lock, flags);
1018
1019 /* make sure it's actually queued on this endpoint */
1020 list_for_each_entry(req, &ep->queue, queue) {
1021 if (&req->req == _req)
1022 break;
1023 }
1024 if (&req->req != _req) {
1025 spin_unlock_irqrestore(&ep->udc->lock, flags);
1026 return -EINVAL;
1027 }
1028
1029 if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) {
1030 int channel = ep->dma_channel;
1031
1032 /* releasing the channel cancels the request,
1033 * reclaiming the channel restarts the queue
1034 */
1035 dma_channel_release(ep);
1036 dma_channel_claim(ep, channel);
1037 } else
1038 done(ep, req, -ECONNRESET);
1039 spin_unlock_irqrestore(&ep->udc->lock, flags);
1040 return 0;
1041 }
1042
1043 /*-------------------------------------------------------------------------*/
1044
1045 static int omap_ep_set_halt(struct usb_ep *_ep, int value)
1046 {
1047 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep);
1048 unsigned long flags;
1049 int status = -EOPNOTSUPP;
1050
1051 spin_lock_irqsave(&ep->udc->lock, flags);
1052
1053 /* just use protocol stalls for ep0; real halts are annoying */
1054 if (ep->bEndpointAddress == 0) {
1055 if (!ep->udc->ep0_pending)
1056 status = -EINVAL;
1057 else if (value) {
1058 if (ep->udc->ep0_set_config) {
1059 WARNING("error changing config?\n");
1060 omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1061 }
1062 omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1063 ep->udc->ep0_pending = 0;
1064 status = 0;
1065 } else /* NOP */
1066 status = 0;
1067
1068 /* otherwise, all active non-ISO endpoints can halt */
1069 } else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->ep.desc) {
1070
1071 /* IN endpoints must already be idle */
1072 if ((ep->bEndpointAddress & USB_DIR_IN)
1073 && !list_empty(&ep->queue)) {
1074 status = -EAGAIN;
1075 goto done;
1076 }
1077
1078 if (value) {
1079 int channel;
1080
1081 if (use_dma && ep->dma_channel
1082 && !list_empty(&ep->queue)) {
1083 channel = ep->dma_channel;
1084 dma_channel_release(ep);
1085 } else
1086 channel = 0;
1087
1088 use_ep(ep, UDC_EP_SEL);
1089 if (omap_readw(UDC_STAT_FLG) & UDC_NON_ISO_FIFO_EMPTY) {
1090 omap_writew(UDC_SET_HALT, UDC_CTRL);
1091 status = 0;
1092 } else
1093 status = -EAGAIN;
1094 deselect_ep();
1095
1096 if (channel)
1097 dma_channel_claim(ep, channel);
1098 } else {
1099 use_ep(ep, 0);
1100 omap_writew(ep->udc->clr_halt, UDC_CTRL);
1101 ep->ackwait = 0;
1102 if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1103 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1104 ep->ackwait = 1 + ep->double_buf;
1105 }
1106 }
1107 }
1108 done:
1109 VDBG("%s %s halt stat %d\n", ep->ep.name,
1110 value ? "set" : "clear", status);
1111
1112 spin_unlock_irqrestore(&ep->udc->lock, flags);
1113 return status;
1114 }
1115
1116 static struct usb_ep_ops omap_ep_ops = {
1117 .enable = omap_ep_enable,
1118 .disable = omap_ep_disable,
1119
1120 .alloc_request = omap_alloc_request,
1121 .free_request = omap_free_request,
1122
1123 .queue = omap_ep_queue,
1124 .dequeue = omap_ep_dequeue,
1125
1126 .set_halt = omap_ep_set_halt,
1127 /* fifo_status ... report bytes in fifo */
1128 /* fifo_flush ... flush fifo */
1129 };
1130
1131 /*-------------------------------------------------------------------------*/
1132
1133 static int omap_get_frame(struct usb_gadget *gadget)
1134 {
1135 u16 sof = omap_readw(UDC_SOF);
1136 return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC;
1137 }
1138
1139 static int omap_wakeup(struct usb_gadget *gadget)
1140 {
1141 struct omap_udc *udc;
1142 unsigned long flags;
1143 int retval = -EHOSTUNREACH;
1144
1145 udc = container_of(gadget, struct omap_udc, gadget);
1146
1147 spin_lock_irqsave(&udc->lock, flags);
1148 if (udc->devstat & UDC_SUS) {
1149 /* NOTE: OTG spec erratum says that OTG devices may
1150 * issue wakeups without host enable.
1151 */
1152 if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) {
1153 DBG("remote wakeup...\n");
1154 omap_writew(UDC_RMT_WKP, UDC_SYSCON2);
1155 retval = 0;
1156 }
1157
1158 /* NOTE: non-OTG systems may use SRP TOO... */
1159 } else if (!(udc->devstat & UDC_ATT)) {
1160 if (!IS_ERR_OR_NULL(udc->transceiver))
1161 retval = otg_start_srp(udc->transceiver->otg);
1162 }
1163 spin_unlock_irqrestore(&udc->lock, flags);
1164
1165 return retval;
1166 }
1167
1168 static int
1169 omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1170 {
1171 struct omap_udc *udc;
1172 unsigned long flags;
1173 u16 syscon1;
1174
1175 udc = container_of(gadget, struct omap_udc, gadget);
1176 spin_lock_irqsave(&udc->lock, flags);
1177 syscon1 = omap_readw(UDC_SYSCON1);
1178 if (is_selfpowered)
1179 syscon1 |= UDC_SELF_PWR;
1180 else
1181 syscon1 &= ~UDC_SELF_PWR;
1182 omap_writew(syscon1, UDC_SYSCON1);
1183 spin_unlock_irqrestore(&udc->lock, flags);
1184
1185 return 0;
1186 }
1187
1188 static int can_pullup(struct omap_udc *udc)
1189 {
1190 return udc->driver && udc->softconnect && udc->vbus_active;
1191 }
1192
1193 static void pullup_enable(struct omap_udc *udc)
1194 {
1195 u16 w;
1196
1197 w = omap_readw(UDC_SYSCON1);
1198 w |= UDC_PULLUP_EN;
1199 omap_writew(w, UDC_SYSCON1);
1200 if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
1201 u32 l;
1202
1203 l = omap_readl(OTG_CTRL);
1204 l |= OTG_BSESSVLD;
1205 omap_writel(l, OTG_CTRL);
1206 }
1207 omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
1208 }
1209
1210 static void pullup_disable(struct omap_udc *udc)
1211 {
1212 u16 w;
1213
1214 if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
1215 u32 l;
1216
1217 l = omap_readl(OTG_CTRL);
1218 l &= ~OTG_BSESSVLD;
1219 omap_writel(l, OTG_CTRL);
1220 }
1221 omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
1222 w = omap_readw(UDC_SYSCON1);
1223 w &= ~UDC_PULLUP_EN;
1224 omap_writew(w, UDC_SYSCON1);
1225 }
1226
1227 static struct omap_udc *udc;
1228
1229 static void omap_udc_enable_clock(int enable)
1230 {
1231 if (udc == NULL || udc->dc_clk == NULL || udc->hhc_clk == NULL)
1232 return;
1233
1234 if (enable) {
1235 clk_enable(udc->dc_clk);
1236 clk_enable(udc->hhc_clk);
1237 udelay(100);
1238 } else {
1239 clk_disable(udc->hhc_clk);
1240 clk_disable(udc->dc_clk);
1241 }
1242 }
1243
1244 /*
1245 * Called by whatever detects VBUS sessions: external transceiver
1246 * driver, or maybe GPIO0 VBUS IRQ. May request 48 MHz clock.
1247 */
1248 static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
1249 {
1250 struct omap_udc *udc;
1251 unsigned long flags;
1252 u32 l;
1253
1254 udc = container_of(gadget, struct omap_udc, gadget);
1255 spin_lock_irqsave(&udc->lock, flags);
1256 VDBG("VBUS %s\n", is_active ? "on" : "off");
1257 udc->vbus_active = (is_active != 0);
1258 if (cpu_is_omap15xx()) {
1259 /* "software" detect, ignored if !VBUS_MODE_1510 */
1260 l = omap_readl(FUNC_MUX_CTRL_0);
1261 if (is_active)
1262 l |= VBUS_CTRL_1510;
1263 else
1264 l &= ~VBUS_CTRL_1510;
1265 omap_writel(l, FUNC_MUX_CTRL_0);
1266 }
1267 if (udc->dc_clk != NULL && is_active) {
1268 if (!udc->clk_requested) {
1269 omap_udc_enable_clock(1);
1270 udc->clk_requested = 1;
1271 }
1272 }
1273 if (can_pullup(udc))
1274 pullup_enable(udc);
1275 else
1276 pullup_disable(udc);
1277 if (udc->dc_clk != NULL && !is_active) {
1278 if (udc->clk_requested) {
1279 omap_udc_enable_clock(0);
1280 udc->clk_requested = 0;
1281 }
1282 }
1283 spin_unlock_irqrestore(&udc->lock, flags);
1284 return 0;
1285 }
1286
1287 static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1288 {
1289 struct omap_udc *udc;
1290
1291 udc = container_of(gadget, struct omap_udc, gadget);
1292 if (!IS_ERR_OR_NULL(udc->transceiver))
1293 return usb_phy_set_power(udc->transceiver, mA);
1294 return -EOPNOTSUPP;
1295 }
1296
1297 static int omap_pullup(struct usb_gadget *gadget, int is_on)
1298 {
1299 struct omap_udc *udc;
1300 unsigned long flags;
1301
1302 udc = container_of(gadget, struct omap_udc, gadget);
1303 spin_lock_irqsave(&udc->lock, flags);
1304 udc->softconnect = (is_on != 0);
1305 if (can_pullup(udc))
1306 pullup_enable(udc);
1307 else
1308 pullup_disable(udc);
1309 spin_unlock_irqrestore(&udc->lock, flags);
1310 return 0;
1311 }
1312
1313 static int omap_udc_start(struct usb_gadget *g,
1314 struct usb_gadget_driver *driver);
1315 static int omap_udc_stop(struct usb_gadget *g,
1316 struct usb_gadget_driver *driver);
1317
1318 static const struct usb_gadget_ops omap_gadget_ops = {
1319 .get_frame = omap_get_frame,
1320 .wakeup = omap_wakeup,
1321 .set_selfpowered = omap_set_selfpowered,
1322 .vbus_session = omap_vbus_session,
1323 .vbus_draw = omap_vbus_draw,
1324 .pullup = omap_pullup,
1325 .udc_start = omap_udc_start,
1326 .udc_stop = omap_udc_stop,
1327 };
1328
1329 /*-------------------------------------------------------------------------*/
1330
1331 /* dequeue ALL requests; caller holds udc->lock */
1332 static void nuke(struct omap_ep *ep, int status)
1333 {
1334 struct omap_req *req;
1335
1336 ep->stopped = 1;
1337
1338 if (use_dma && ep->dma_channel)
1339 dma_channel_release(ep);
1340
1341 use_ep(ep, 0);
1342 omap_writew(UDC_CLR_EP, UDC_CTRL);
1343 if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
1344 omap_writew(UDC_SET_HALT, UDC_CTRL);
1345
1346 while (!list_empty(&ep->queue)) {
1347 req = list_entry(ep->queue.next, struct omap_req, queue);
1348 done(ep, req, status);
1349 }
1350 }
1351
1352 /* caller holds udc->lock */
1353 static void udc_quiesce(struct omap_udc *udc)
1354 {
1355 struct omap_ep *ep;
1356
1357 udc->gadget.speed = USB_SPEED_UNKNOWN;
1358 nuke(&udc->ep[0], -ESHUTDOWN);
1359 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list)
1360 nuke(ep, -ESHUTDOWN);
1361 }
1362
1363 /*-------------------------------------------------------------------------*/
1364
1365 static void update_otg(struct omap_udc *udc)
1366 {
1367 u16 devstat;
1368
1369 if (!gadget_is_otg(&udc->gadget))
1370 return;
1371
1372 if (omap_readl(OTG_CTRL) & OTG_ID)
1373 devstat = omap_readw(UDC_DEVSTAT);
1374 else
1375 devstat = 0;
1376
1377 udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE);
1378 udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT);
1379 udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT);
1380
1381 /* Enable HNP early, avoiding races on suspend irq path.
1382 * ASSUMES OTG state machine B_BUS_REQ input is true.
1383 */
1384 if (udc->gadget.b_hnp_enable) {
1385 u32 l;
1386
1387 l = omap_readl(OTG_CTRL);
1388 l |= OTG_B_HNPEN | OTG_B_BUSREQ;
1389 l &= ~OTG_PULLUP;
1390 omap_writel(l, OTG_CTRL);
1391 }
1392 }
1393
1394 static void ep0_irq(struct omap_udc *udc, u16 irq_src)
1395 {
1396 struct omap_ep *ep0 = &udc->ep[0];
1397 struct omap_req *req = NULL;
1398
1399 ep0->irqs++;
1400
1401 /* Clear any pending requests and then scrub any rx/tx state
1402 * before starting to handle the SETUP request.
1403 */
1404 if (irq_src & UDC_SETUP) {
1405 u16 ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX);
1406
1407 nuke(ep0, 0);
1408 if (ack) {
1409 omap_writew(ack, UDC_IRQ_SRC);
1410 irq_src = UDC_SETUP;
1411 }
1412 }
1413
1414 /* IN/OUT packets mean we're in the DATA or STATUS stage.
1415 * This driver uses only uses protocol stalls (ep0 never halts),
1416 * and if we got this far the gadget driver already had a
1417 * chance to stall. Tries to be forgiving of host oddities.
1418 *
1419 * NOTE: the last chance gadget drivers have to stall control
1420 * requests is during their request completion callback.
1421 */
1422 if (!list_empty(&ep0->queue))
1423 req = container_of(ep0->queue.next, struct omap_req, queue);
1424
1425 /* IN == TX to host */
1426 if (irq_src & UDC_EP0_TX) {
1427 int stat;
1428
1429 omap_writew(UDC_EP0_TX, UDC_IRQ_SRC);
1430 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1431 stat = omap_readw(UDC_STAT_FLG);
1432 if (stat & UDC_ACK) {
1433 if (udc->ep0_in) {
1434 /* write next IN packet from response,
1435 * or set up the status stage.
1436 */
1437 if (req)
1438 stat = write_fifo(ep0, req);
1439 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1440 if (!req && udc->ep0_pending) {
1441 omap_writew(UDC_EP_SEL, UDC_EP_NUM);
1442 omap_writew(UDC_CLR_EP, UDC_CTRL);
1443 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1444 omap_writew(0, UDC_EP_NUM);
1445 udc->ep0_pending = 0;
1446 } /* else: 6 wait states before it'll tx */
1447 } else {
1448 /* ack status stage of OUT transfer */
1449 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1450 if (req)
1451 done(ep0, req, 0);
1452 }
1453 req = NULL;
1454 } else if (stat & UDC_STALL) {
1455 omap_writew(UDC_CLR_HALT, UDC_CTRL);
1456 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1457 } else {
1458 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1459 }
1460 }
1461
1462 /* OUT == RX from host */
1463 if (irq_src & UDC_EP0_RX) {
1464 int stat;
1465
1466 omap_writew(UDC_EP0_RX, UDC_IRQ_SRC);
1467 omap_writew(UDC_EP_SEL, UDC_EP_NUM);
1468 stat = omap_readw(UDC_STAT_FLG);
1469 if (stat & UDC_ACK) {
1470 if (!udc->ep0_in) {
1471 stat = 0;
1472 /* read next OUT packet of request, maybe
1473 * reactiviting the fifo; stall on errors.
1474 */
1475 stat = read_fifo(ep0, req);
1476 if (!req || stat < 0) {
1477 omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1478 udc->ep0_pending = 0;
1479 stat = 0;
1480 } else if (stat == 0)
1481 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1482 omap_writew(0, UDC_EP_NUM);
1483
1484 /* activate status stage */
1485 if (stat == 1) {
1486 done(ep0, req, 0);
1487 /* that may have STALLed ep0... */
1488 omap_writew(UDC_EP_SEL | UDC_EP_DIR,
1489 UDC_EP_NUM);
1490 omap_writew(UDC_CLR_EP, UDC_CTRL);
1491 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1492 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1493 udc->ep0_pending = 0;
1494 }
1495 } else {
1496 /* ack status stage of IN transfer */
1497 omap_writew(0, UDC_EP_NUM);
1498 if (req)
1499 done(ep0, req, 0);
1500 }
1501 } else if (stat & UDC_STALL) {
1502 omap_writew(UDC_CLR_HALT, UDC_CTRL);
1503 omap_writew(0, UDC_EP_NUM);
1504 } else {
1505 omap_writew(0, UDC_EP_NUM);
1506 }
1507 }
1508
1509 /* SETUP starts all control transfers */
1510 if (irq_src & UDC_SETUP) {
1511 union u {
1512 u16 word[4];
1513 struct usb_ctrlrequest r;
1514 } u;
1515 int status = -EINVAL;
1516 struct omap_ep *ep;
1517
1518 /* read the (latest) SETUP message */
1519 do {
1520 omap_writew(UDC_SETUP_SEL, UDC_EP_NUM);
1521 /* two bytes at a time */
1522 u.word[0] = omap_readw(UDC_DATA);
1523 u.word[1] = omap_readw(UDC_DATA);
1524 u.word[2] = omap_readw(UDC_DATA);
1525 u.word[3] = omap_readw(UDC_DATA);
1526 omap_writew(0, UDC_EP_NUM);
1527 } while (omap_readw(UDC_IRQ_SRC) & UDC_SETUP);
1528
1529 #define w_value le16_to_cpu(u.r.wValue)
1530 #define w_index le16_to_cpu(u.r.wIndex)
1531 #define w_length le16_to_cpu(u.r.wLength)
1532
1533 /* Delegate almost all control requests to the gadget driver,
1534 * except for a handful of ch9 status/feature requests that
1535 * hardware doesn't autodecode _and_ the gadget API hides.
1536 */
1537 udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0;
1538 udc->ep0_set_config = 0;
1539 udc->ep0_pending = 1;
1540 ep0->stopped = 0;
1541 ep0->ackwait = 0;
1542 switch (u.r.bRequest) {
1543 case USB_REQ_SET_CONFIGURATION:
1544 /* udc needs to know when ep != 0 is valid */
1545 if (u.r.bRequestType != USB_RECIP_DEVICE)
1546 goto delegate;
1547 if (w_length != 0)
1548 goto do_stall;
1549 udc->ep0_set_config = 1;
1550 udc->ep0_reset_config = (w_value == 0);
1551 VDBG("set config %d\n", w_value);
1552
1553 /* update udc NOW since gadget driver may start
1554 * queueing requests immediately; clear config
1555 * later if it fails the request.
1556 */
1557 if (udc->ep0_reset_config)
1558 omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1559 else
1560 omap_writew(UDC_DEV_CFG, UDC_SYSCON2);
1561 update_otg(udc);
1562 goto delegate;
1563 case USB_REQ_CLEAR_FEATURE:
1564 /* clear endpoint halt */
1565 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1566 goto delegate;
1567 if (w_value != USB_ENDPOINT_HALT
1568 || w_length != 0)
1569 goto do_stall;
1570 ep = &udc->ep[w_index & 0xf];
1571 if (ep != ep0) {
1572 if (w_index & USB_DIR_IN)
1573 ep += 16;
1574 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1575 || !ep->ep.desc)
1576 goto do_stall;
1577 use_ep(ep, 0);
1578 omap_writew(udc->clr_halt, UDC_CTRL);
1579 ep->ackwait = 0;
1580 if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1581 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1582 ep->ackwait = 1 + ep->double_buf;
1583 }
1584 /* NOTE: assumes the host behaves sanely,
1585 * only clearing real halts. Else we may
1586 * need to kill pending transfers and then
1587 * restart the queue... very messy for DMA!
1588 */
1589 }
1590 VDBG("%s halt cleared by host\n", ep->name);
1591 goto ep0out_status_stage;
1592 case USB_REQ_SET_FEATURE:
1593 /* set endpoint halt */
1594 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1595 goto delegate;
1596 if (w_value != USB_ENDPOINT_HALT
1597 || w_length != 0)
1598 goto do_stall;
1599 ep = &udc->ep[w_index & 0xf];
1600 if (w_index & USB_DIR_IN)
1601 ep += 16;
1602 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1603 || ep == ep0 || !ep->ep.desc)
1604 goto do_stall;
1605 if (use_dma && ep->has_dma) {
1606 /* this has rude side-effects (aborts) and
1607 * can't really work if DMA-IN is active
1608 */
1609 DBG("%s host set_halt, NYET\n", ep->name);
1610 goto do_stall;
1611 }
1612 use_ep(ep, 0);
1613 /* can't halt if fifo isn't empty... */
1614 omap_writew(UDC_CLR_EP, UDC_CTRL);
1615 omap_writew(UDC_SET_HALT, UDC_CTRL);
1616 VDBG("%s halted by host\n", ep->name);
1617 ep0out_status_stage:
1618 status = 0;
1619 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1620 omap_writew(UDC_CLR_EP, UDC_CTRL);
1621 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1622 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1623 udc->ep0_pending = 0;
1624 break;
1625 case USB_REQ_GET_STATUS:
1626 /* USB_ENDPOINT_HALT status? */
1627 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
1628 goto intf_status;
1629
1630 /* ep0 never stalls */
1631 if (!(w_index & 0xf))
1632 goto zero_status;
1633
1634 /* only active endpoints count */
1635 ep = &udc->ep[w_index & 0xf];
1636 if (w_index & USB_DIR_IN)
1637 ep += 16;
1638 if (!ep->ep.desc)
1639 goto do_stall;
1640
1641 /* iso never stalls */
1642 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
1643 goto zero_status;
1644
1645 /* FIXME don't assume non-halted endpoints!! */
1646 ERR("%s status, can't report\n", ep->ep.name);
1647 goto do_stall;
1648
1649 intf_status:
1650 /* return interface status. if we were pedantic,
1651 * we'd detect non-existent interfaces, and stall.
1652 */
1653 if (u.r.bRequestType
1654 != (USB_DIR_IN|USB_RECIP_INTERFACE))
1655 goto delegate;
1656
1657 zero_status:
1658 /* return two zero bytes */
1659 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1660 omap_writew(0, UDC_DATA);
1661 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1662 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1663 status = 0;
1664 VDBG("GET_STATUS, interface %d\n", w_index);
1665 /* next, status stage */
1666 break;
1667 default:
1668 delegate:
1669 /* activate the ep0out fifo right away */
1670 if (!udc->ep0_in && w_length) {
1671 omap_writew(0, UDC_EP_NUM);
1672 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1673 }
1674
1675 /* gadget drivers see class/vendor specific requests,
1676 * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION},
1677 * and more
1678 */
1679 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1680 u.r.bRequestType, u.r.bRequest,
1681 w_value, w_index, w_length);
1682
1683 #undef w_value
1684 #undef w_index
1685 #undef w_length
1686
1687 /* The gadget driver may return an error here,
1688 * causing an immediate protocol stall.
1689 *
1690 * Else it must issue a response, either queueing a
1691 * response buffer for the DATA stage, or halting ep0
1692 * (causing a protocol stall, not a real halt). A
1693 * zero length buffer means no DATA stage.
1694 *
1695 * It's fine to issue that response after the setup()
1696 * call returns, and this IRQ was handled.
1697 */
1698 udc->ep0_setup = 1;
1699 spin_unlock(&udc->lock);
1700 status = udc->driver->setup(&udc->gadget, &u.r);
1701 spin_lock(&udc->lock);
1702 udc->ep0_setup = 0;
1703 }
1704
1705 if (status < 0) {
1706 do_stall:
1707 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1708 u.r.bRequestType, u.r.bRequest, status);
1709 if (udc->ep0_set_config) {
1710 if (udc->ep0_reset_config)
1711 WARNING("error resetting config?\n");
1712 else
1713 omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1714 }
1715 omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1716 udc->ep0_pending = 0;
1717 }
1718 }
1719 }
1720
1721 /*-------------------------------------------------------------------------*/
1722
1723 #define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT)
1724
1725 static void devstate_irq(struct omap_udc *udc, u16 irq_src)
1726 {
1727 u16 devstat, change;
1728
1729 devstat = omap_readw(UDC_DEVSTAT);
1730 change = devstat ^ udc->devstat;
1731 udc->devstat = devstat;
1732
1733 if (change & (UDC_USB_RESET|UDC_ATT)) {
1734 udc_quiesce(udc);
1735
1736 if (change & UDC_ATT) {
1737 /* driver for any external transceiver will
1738 * have called omap_vbus_session() already
1739 */
1740 if (devstat & UDC_ATT) {
1741 udc->gadget.speed = USB_SPEED_FULL;
1742 VDBG("connect\n");
1743 if (IS_ERR_OR_NULL(udc->transceiver))
1744 pullup_enable(udc);
1745 /* if (driver->connect) call it */
1746 } else if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1747 udc->gadget.speed = USB_SPEED_UNKNOWN;
1748 if (IS_ERR_OR_NULL(udc->transceiver))
1749 pullup_disable(udc);
1750 DBG("disconnect, gadget %s\n",
1751 udc->driver->driver.name);
1752 if (udc->driver->disconnect) {
1753 spin_unlock(&udc->lock);
1754 udc->driver->disconnect(&udc->gadget);
1755 spin_lock(&udc->lock);
1756 }
1757 }
1758 change &= ~UDC_ATT;
1759 }
1760
1761 if (change & UDC_USB_RESET) {
1762 if (devstat & UDC_USB_RESET) {
1763 VDBG("RESET=1\n");
1764 } else {
1765 udc->gadget.speed = USB_SPEED_FULL;
1766 INFO("USB reset done, gadget %s\n",
1767 udc->driver->driver.name);
1768 /* ep0 traffic is legal from now on */
1769 omap_writew(UDC_DS_CHG_IE | UDC_EP0_IE,
1770 UDC_IRQ_EN);
1771 }
1772 change &= ~UDC_USB_RESET;
1773 }
1774 }
1775 if (change & UDC_SUS) {
1776 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1777 /* FIXME tell isp1301 to suspend/resume (?) */
1778 if (devstat & UDC_SUS) {
1779 VDBG("suspend\n");
1780 update_otg(udc);
1781 /* HNP could be under way already */
1782 if (udc->gadget.speed == USB_SPEED_FULL
1783 && udc->driver->suspend) {
1784 spin_unlock(&udc->lock);
1785 udc->driver->suspend(&udc->gadget);
1786 spin_lock(&udc->lock);
1787 }
1788 if (!IS_ERR_OR_NULL(udc->transceiver))
1789 usb_phy_set_suspend(
1790 udc->transceiver, 1);
1791 } else {
1792 VDBG("resume\n");
1793 if (!IS_ERR_OR_NULL(udc->transceiver))
1794 usb_phy_set_suspend(
1795 udc->transceiver, 0);
1796 if (udc->gadget.speed == USB_SPEED_FULL
1797 && udc->driver->resume) {
1798 spin_unlock(&udc->lock);
1799 udc->driver->resume(&udc->gadget);
1800 spin_lock(&udc->lock);
1801 }
1802 }
1803 }
1804 change &= ~UDC_SUS;
1805 }
1806 if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) {
1807 update_otg(udc);
1808 change &= ~OTG_FLAGS;
1809 }
1810
1811 change &= ~(UDC_CFG|UDC_DEF|UDC_ADD);
1812 if (change)
1813 VDBG("devstat %03x, ignore change %03x\n",
1814 devstat, change);
1815
1816 omap_writew(UDC_DS_CHG, UDC_IRQ_SRC);
1817 }
1818
1819 static irqreturn_t omap_udc_irq(int irq, void *_udc)
1820 {
1821 struct omap_udc *udc = _udc;
1822 u16 irq_src;
1823 irqreturn_t status = IRQ_NONE;
1824 unsigned long flags;
1825
1826 spin_lock_irqsave(&udc->lock, flags);
1827 irq_src = omap_readw(UDC_IRQ_SRC);
1828
1829 /* Device state change (usb ch9 stuff) */
1830 if (irq_src & UDC_DS_CHG) {
1831 devstate_irq(_udc, irq_src);
1832 status = IRQ_HANDLED;
1833 irq_src &= ~UDC_DS_CHG;
1834 }
1835
1836 /* EP0 control transfers */
1837 if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) {
1838 ep0_irq(_udc, irq_src);
1839 status = IRQ_HANDLED;
1840 irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX);
1841 }
1842
1843 /* DMA transfer completion */
1844 if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) {
1845 dma_irq(_udc, irq_src);
1846 status = IRQ_HANDLED;
1847 irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT);
1848 }
1849
1850 irq_src &= ~(UDC_IRQ_SOF | UDC_EPN_TX|UDC_EPN_RX);
1851 if (irq_src)
1852 DBG("udc_irq, unhandled %03x\n", irq_src);
1853 spin_unlock_irqrestore(&udc->lock, flags);
1854
1855 return status;
1856 }
1857
1858 /* workaround for seemingly-lost IRQs for RX ACKs... */
1859 #define PIO_OUT_TIMEOUT (jiffies + HZ/3)
1860 #define HALF_FULL(f) (!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY)))
1861
1862 static void pio_out_timer(unsigned long _ep)
1863 {
1864 struct omap_ep *ep = (void *) _ep;
1865 unsigned long flags;
1866 u16 stat_flg;
1867
1868 spin_lock_irqsave(&ep->udc->lock, flags);
1869 if (!list_empty(&ep->queue) && ep->ackwait) {
1870 use_ep(ep, UDC_EP_SEL);
1871 stat_flg = omap_readw(UDC_STAT_FLG);
1872
1873 if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
1874 || (ep->double_buf && HALF_FULL(stat_flg)))) {
1875 struct omap_req *req;
1876
1877 VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg);
1878 req = container_of(ep->queue.next,
1879 struct omap_req, queue);
1880 (void) read_fifo(ep, req);
1881 omap_writew(ep->bEndpointAddress, UDC_EP_NUM);
1882 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1883 ep->ackwait = 1 + ep->double_buf;
1884 } else
1885 deselect_ep();
1886 }
1887 mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1888 spin_unlock_irqrestore(&ep->udc->lock, flags);
1889 }
1890
1891 static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
1892 {
1893 u16 epn_stat, irq_src;
1894 irqreturn_t status = IRQ_NONE;
1895 struct omap_ep *ep;
1896 int epnum;
1897 struct omap_udc *udc = _dev;
1898 struct omap_req *req;
1899 unsigned long flags;
1900
1901 spin_lock_irqsave(&udc->lock, flags);
1902 epn_stat = omap_readw(UDC_EPN_STAT);
1903 irq_src = omap_readw(UDC_IRQ_SRC);
1904
1905 /* handle OUT first, to avoid some wasteful NAKs */
1906 if (irq_src & UDC_EPN_RX) {
1907 epnum = (epn_stat >> 8) & 0x0f;
1908 omap_writew(UDC_EPN_RX, UDC_IRQ_SRC);
1909 status = IRQ_HANDLED;
1910 ep = &udc->ep[epnum];
1911 ep->irqs++;
1912
1913 omap_writew(epnum | UDC_EP_SEL, UDC_EP_NUM);
1914 ep->fnf = 0;
1915 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
1916 ep->ackwait--;
1917 if (!list_empty(&ep->queue)) {
1918 int stat;
1919 req = container_of(ep->queue.next,
1920 struct omap_req, queue);
1921 stat = read_fifo(ep, req);
1922 if (!ep->double_buf)
1923 ep->fnf = 1;
1924 }
1925 }
1926 /* min 6 clock delay before clearing EP_SEL ... */
1927 epn_stat = omap_readw(UDC_EPN_STAT);
1928 epn_stat = omap_readw(UDC_EPN_STAT);
1929 omap_writew(epnum, UDC_EP_NUM);
1930
1931 /* enabling fifo _after_ clearing ACK, contrary to docs,
1932 * reduces lossage; timer still needed though (sigh).
1933 */
1934 if (ep->fnf) {
1935 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1936 ep->ackwait = 1 + ep->double_buf;
1937 }
1938 mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1939 }
1940
1941 /* then IN transfers */
1942 else if (irq_src & UDC_EPN_TX) {
1943 epnum = epn_stat & 0x0f;
1944 omap_writew(UDC_EPN_TX, UDC_IRQ_SRC);
1945 status = IRQ_HANDLED;
1946 ep = &udc->ep[16 + epnum];
1947 ep->irqs++;
1948
1949 omap_writew(epnum | UDC_EP_DIR | UDC_EP_SEL, UDC_EP_NUM);
1950 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
1951 ep->ackwait = 0;
1952 if (!list_empty(&ep->queue)) {
1953 req = container_of(ep->queue.next,
1954 struct omap_req, queue);
1955 (void) write_fifo(ep, req);
1956 }
1957 }
1958 /* min 6 clock delay before clearing EP_SEL ... */
1959 epn_stat = omap_readw(UDC_EPN_STAT);
1960 epn_stat = omap_readw(UDC_EPN_STAT);
1961 omap_writew(epnum | UDC_EP_DIR, UDC_EP_NUM);
1962 /* then 6 clocks before it'd tx */
1963 }
1964
1965 spin_unlock_irqrestore(&udc->lock, flags);
1966 return status;
1967 }
1968
1969 #ifdef USE_ISO
1970 static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
1971 {
1972 struct omap_udc *udc = _dev;
1973 struct omap_ep *ep;
1974 int pending = 0;
1975 unsigned long flags;
1976
1977 spin_lock_irqsave(&udc->lock, flags);
1978
1979 /* handle all non-DMA ISO transfers */
1980 list_for_each_entry(ep, &udc->iso, iso) {
1981 u16 stat;
1982 struct omap_req *req;
1983
1984 if (ep->has_dma || list_empty(&ep->queue))
1985 continue;
1986 req = list_entry(ep->queue.next, struct omap_req, queue);
1987
1988 use_ep(ep, UDC_EP_SEL);
1989 stat = omap_readw(UDC_STAT_FLG);
1990
1991 /* NOTE: like the other controller drivers, this isn't
1992 * currently reporting lost or damaged frames.
1993 */
1994 if (ep->bEndpointAddress & USB_DIR_IN) {
1995 if (stat & UDC_MISS_IN)
1996 /* done(ep, req, -EPROTO) */;
1997 else
1998 write_fifo(ep, req);
1999 } else {
2000 int status = 0;
2001
2002 if (stat & UDC_NO_RXPACKET)
2003 status = -EREMOTEIO;
2004 else if (stat & UDC_ISO_ERR)
2005 status = -EILSEQ;
2006 else if (stat & UDC_DATA_FLUSH)
2007 status = -ENOSR;
2008
2009 if (status)
2010 /* done(ep, req, status) */;
2011 else
2012 read_fifo(ep, req);
2013 }
2014 deselect_ep();
2015 /* 6 wait states before next EP */
2016
2017 ep->irqs++;
2018 if (!list_empty(&ep->queue))
2019 pending = 1;
2020 }
2021 if (!pending) {
2022 u16 w;
2023
2024 w = omap_readw(UDC_IRQ_EN);
2025 w &= ~UDC_SOF_IE;
2026 omap_writew(w, UDC_IRQ_EN);
2027 }
2028 omap_writew(UDC_IRQ_SOF, UDC_IRQ_SRC);
2029
2030 spin_unlock_irqrestore(&udc->lock, flags);
2031 return IRQ_HANDLED;
2032 }
2033 #endif
2034
2035 /*-------------------------------------------------------------------------*/
2036
2037 static inline int machine_without_vbus_sense(void)
2038 {
2039 return machine_is_omap_innovator()
2040 || machine_is_omap_osk()
2041 || machine_is_sx1()
2042 /* No known omap7xx boards with vbus sense */
2043 || cpu_is_omap7xx();
2044 }
2045
2046 static int omap_udc_start(struct usb_gadget *g,
2047 struct usb_gadget_driver *driver)
2048 {
2049 int status = -ENODEV;
2050 struct omap_ep *ep;
2051 unsigned long flags;
2052
2053
2054 spin_lock_irqsave(&udc->lock, flags);
2055 /* reset state */
2056 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
2057 ep->irqs = 0;
2058 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
2059 continue;
2060 use_ep(ep, 0);
2061 omap_writew(UDC_SET_HALT, UDC_CTRL);
2062 }
2063 udc->ep0_pending = 0;
2064 udc->ep[0].irqs = 0;
2065 udc->softconnect = 1;
2066
2067 /* hook up the driver */
2068 driver->driver.bus = NULL;
2069 udc->driver = driver;
2070 spin_unlock_irqrestore(&udc->lock, flags);
2071
2072 if (udc->dc_clk != NULL)
2073 omap_udc_enable_clock(1);
2074
2075 omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
2076
2077 /* connect to bus through transceiver */
2078 if (!IS_ERR_OR_NULL(udc->transceiver)) {
2079 status = otg_set_peripheral(udc->transceiver->otg,
2080 &udc->gadget);
2081 if (status < 0) {
2082 ERR("can't bind to transceiver\n");
2083 if (driver->unbind) {
2084 driver->unbind(&udc->gadget);
2085 udc->driver = NULL;
2086 }
2087 goto done;
2088 }
2089 } else {
2090 if (can_pullup(udc))
2091 pullup_enable(udc);
2092 else
2093 pullup_disable(udc);
2094 }
2095
2096 /* boards that don't have VBUS sensing can't autogate 48MHz;
2097 * can't enter deep sleep while a gadget driver is active.
2098 */
2099 if (machine_without_vbus_sense())
2100 omap_vbus_session(&udc->gadget, 1);
2101
2102 done:
2103 if (udc->dc_clk != NULL)
2104 omap_udc_enable_clock(0);
2105
2106 return status;
2107 }
2108
2109 static int omap_udc_stop(struct usb_gadget *g,
2110 struct usb_gadget_driver *driver)
2111 {
2112 unsigned long flags;
2113 int status = -ENODEV;
2114
2115 if (udc->dc_clk != NULL)
2116 omap_udc_enable_clock(1);
2117
2118 if (machine_without_vbus_sense())
2119 omap_vbus_session(&udc->gadget, 0);
2120
2121 if (!IS_ERR_OR_NULL(udc->transceiver))
2122 (void) otg_set_peripheral(udc->transceiver->otg, NULL);
2123 else
2124 pullup_disable(udc);
2125
2126 spin_lock_irqsave(&udc->lock, flags);
2127 udc_quiesce(udc);
2128 spin_unlock_irqrestore(&udc->lock, flags);
2129
2130 udc->driver = NULL;
2131
2132 if (udc->dc_clk != NULL)
2133 omap_udc_enable_clock(0);
2134
2135 return status;
2136 }
2137
2138 /*-------------------------------------------------------------------------*/
2139
2140 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
2141
2142 #include <linux/seq_file.h>
2143
2144 static const char proc_filename[] = "driver/udc";
2145
2146 #define FOURBITS "%s%s%s%s"
2147 #define EIGHTBITS "%s%s%s%s%s%s%s%s"
2148
2149 static void proc_ep_show(struct seq_file *s, struct omap_ep *ep)
2150 {
2151 u16 stat_flg;
2152 struct omap_req *req;
2153 char buf[20];
2154
2155 use_ep(ep, 0);
2156
2157 if (use_dma && ep->has_dma)
2158 snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ",
2159 (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
2160 ep->dma_channel - 1, ep->lch);
2161 else
2162 buf[0] = 0;
2163
2164 stat_flg = omap_readw(UDC_STAT_FLG);
2165 seq_printf(s,
2166 "\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n",
2167 ep->name, buf,
2168 ep->double_buf ? "dbuf " : "",
2169 ({ char *s;
2170 switch (ep->ackwait) {
2171 case 0:
2172 s = "";
2173 break;
2174 case 1:
2175 s = "(ackw) ";
2176 break;
2177 case 2:
2178 s = "(ackw2) ";
2179 break;
2180 default:
2181 s = "(?) ";
2182 break;
2183 } s; }),
2184 ep->irqs, stat_flg,
2185 (stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "",
2186 (stat_flg & UDC_MISS_IN) ? "miss_in " : "",
2187 (stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "",
2188 (stat_flg & UDC_ISO_ERR) ? "iso_err " : "",
2189 (stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "",
2190 (stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "",
2191 (stat_flg & UDC_EP_HALTED) ? "HALT " : "",
2192 (stat_flg & UDC_STALL) ? "STALL " : "",
2193 (stat_flg & UDC_NAK) ? "NAK " : "",
2194 (stat_flg & UDC_ACK) ? "ACK " : "",
2195 (stat_flg & UDC_FIFO_EN) ? "fifo_en " : "",
2196 (stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "",
2197 (stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : "");
2198
2199 if (list_empty(&ep->queue))
2200 seq_printf(s, "\t(queue empty)\n");
2201 else
2202 list_for_each_entry(req, &ep->queue, queue) {
2203 unsigned length = req->req.actual;
2204
2205 if (use_dma && buf[0]) {
2206 length += ((ep->bEndpointAddress & USB_DIR_IN)
2207 ? dma_src_len : dma_dest_len)
2208 (ep, req->req.dma + length);
2209 buf[0] = 0;
2210 }
2211 seq_printf(s, "\treq %p len %d/%d buf %p\n",
2212 &req->req, length,
2213 req->req.length, req->req.buf);
2214 }
2215 }
2216
2217 static char *trx_mode(unsigned m, int enabled)
2218 {
2219 switch (m) {
2220 case 0:
2221 return enabled ? "*6wire" : "unused";
2222 case 1:
2223 return "4wire";
2224 case 2:
2225 return "3wire";
2226 case 3:
2227 return "6wire";
2228 default:
2229 return "unknown";
2230 }
2231 }
2232
2233 static int proc_otg_show(struct seq_file *s)
2234 {
2235 u32 tmp;
2236 u32 trans = 0;
2237 char *ctrl_name = "(UNKNOWN)";
2238
2239 tmp = omap_readl(OTG_REV);
2240 ctrl_name = "tranceiver_ctrl";
2241 trans = omap_readw(USB_TRANSCEIVER_CTRL);
2242 seq_printf(s, "\nOTG rev %d.%d, %s %05x\n",
2243 tmp >> 4, tmp & 0xf, ctrl_name, trans);
2244 tmp = omap_readw(OTG_SYSCON_1);
2245 seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
2246 FOURBITS "\n", tmp,
2247 trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R),
2248 trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R),
2249 (USB0_TRX_MODE(tmp) == 0 && !cpu_is_omap1710())
2250 ? "internal"
2251 : trx_mode(USB0_TRX_MODE(tmp), 1),
2252 (tmp & OTG_IDLE_EN) ? " !otg" : "",
2253 (tmp & HST_IDLE_EN) ? " !host" : "",
2254 (tmp & DEV_IDLE_EN) ? " !dev" : "",
2255 (tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active");
2256 tmp = omap_readl(OTG_SYSCON_2);
2257 seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS
2258 " b_ase_brst=%d hmc=%d\n", tmp,
2259 (tmp & OTG_EN) ? " otg_en" : "",
2260 (tmp & USBX_SYNCHRO) ? " synchro" : "",
2261 /* much more SRP stuff */
2262 (tmp & SRP_DATA) ? " srp_data" : "",
2263 (tmp & SRP_VBUS) ? " srp_vbus" : "",
2264 (tmp & OTG_PADEN) ? " otg_paden" : "",
2265 (tmp & HMC_PADEN) ? " hmc_paden" : "",
2266 (tmp & UHOST_EN) ? " uhost_en" : "",
2267 (tmp & HMC_TLLSPEED) ? " tllspeed" : "",
2268 (tmp & HMC_TLLATTACH) ? " tllattach" : "",
2269 B_ASE_BRST(tmp),
2270 OTG_HMC(tmp));
2271 tmp = omap_readl(OTG_CTRL);
2272 seq_printf(s, "otg_ctrl %06x" EIGHTBITS EIGHTBITS "%s\n", tmp,
2273 (tmp & OTG_ASESSVLD) ? " asess" : "",
2274 (tmp & OTG_BSESSEND) ? " bsess_end" : "",
2275 (tmp & OTG_BSESSVLD) ? " bsess" : "",
2276 (tmp & OTG_VBUSVLD) ? " vbus" : "",
2277 (tmp & OTG_ID) ? " id" : "",
2278 (tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST",
2279 (tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "",
2280 (tmp & OTG_A_BUSREQ) ? " a_bus" : "",
2281 (tmp & OTG_B_HNPEN) ? " b_hnpen" : "",
2282 (tmp & OTG_B_BUSREQ) ? " b_bus" : "",
2283 (tmp & OTG_BUSDROP) ? " busdrop" : "",
2284 (tmp & OTG_PULLDOWN) ? " down" : "",
2285 (tmp & OTG_PULLUP) ? " up" : "",
2286 (tmp & OTG_DRV_VBUS) ? " drv" : "",
2287 (tmp & OTG_PD_VBUS) ? " pd_vb" : "",
2288 (tmp & OTG_PU_VBUS) ? " pu_vb" : "",
2289 (tmp & OTG_PU_ID) ? " pu_id" : ""
2290 );
2291 tmp = omap_readw(OTG_IRQ_EN);
2292 seq_printf(s, "otg_irq_en %04x" "\n", tmp);
2293 tmp = omap_readw(OTG_IRQ_SRC);
2294 seq_printf(s, "otg_irq_src %04x" "\n", tmp);
2295 tmp = omap_readw(OTG_OUTCTRL);
2296 seq_printf(s, "otg_outctrl %04x" "\n", tmp);
2297 tmp = omap_readw(OTG_TEST);
2298 seq_printf(s, "otg_test %04x" "\n", tmp);
2299 return 0;
2300 }
2301
2302 static int proc_udc_show(struct seq_file *s, void *_)
2303 {
2304 u32 tmp;
2305 struct omap_ep *ep;
2306 unsigned long flags;
2307
2308 spin_lock_irqsave(&udc->lock, flags);
2309
2310 seq_printf(s, "%s, version: " DRIVER_VERSION
2311 #ifdef USE_ISO
2312 " (iso)"
2313 #endif
2314 "%s\n",
2315 driver_desc,
2316 use_dma ? " (dma)" : "");
2317
2318 tmp = omap_readw(UDC_REV) & 0xff;
2319 seq_printf(s,
2320 "UDC rev %d.%d, fifo mode %d, gadget %s\n"
2321 "hmc %d, transceiver %s\n",
2322 tmp >> 4, tmp & 0xf,
2323 fifo_mode,
2324 udc->driver ? udc->driver->driver.name : "(none)",
2325 HMC,
2326 udc->transceiver
2327 ? udc->transceiver->label
2328 : (cpu_is_omap1710()
2329 ? "external" : "(none)"));
2330 seq_printf(s, "ULPD control %04x req %04x status %04x\n",
2331 omap_readw(ULPD_CLOCK_CTRL),
2332 omap_readw(ULPD_SOFT_REQ),
2333 omap_readw(ULPD_STATUS_REQ));
2334
2335 /* OTG controller registers */
2336 if (!cpu_is_omap15xx())
2337 proc_otg_show(s);
2338
2339 tmp = omap_readw(UDC_SYSCON1);
2340 seq_printf(s, "\nsyscon1 %04x" EIGHTBITS "\n", tmp,
2341 (tmp & UDC_CFG_LOCK) ? " cfg_lock" : "",
2342 (tmp & UDC_DATA_ENDIAN) ? " data_endian" : "",
2343 (tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "",
2344 (tmp & UDC_NAK_EN) ? " nak" : "",
2345 (tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "",
2346 (tmp & UDC_SELF_PWR) ? " self_pwr" : "",
2347 (tmp & UDC_SOFF_DIS) ? " soff_dis" : "",
2348 (tmp & UDC_PULLUP_EN) ? " PULLUP" : "");
2349 /* syscon2 is write-only */
2350
2351 /* UDC controller registers */
2352 if (!(tmp & UDC_PULLUP_EN)) {
2353 seq_printf(s, "(suspended)\n");
2354 spin_unlock_irqrestore(&udc->lock, flags);
2355 return 0;
2356 }
2357
2358 tmp = omap_readw(UDC_DEVSTAT);
2359 seq_printf(s, "devstat %04x" EIGHTBITS "%s%s\n", tmp,
2360 (tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "",
2361 (tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "",
2362 (tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "",
2363 (tmp & UDC_R_WK_OK) ? " r_wk_ok" : "",
2364 (tmp & UDC_USB_RESET) ? " usb_reset" : "",
2365 (tmp & UDC_SUS) ? " SUS" : "",
2366 (tmp & UDC_CFG) ? " CFG" : "",
2367 (tmp & UDC_ADD) ? " ADD" : "",
2368 (tmp & UDC_DEF) ? " DEF" : "",
2369 (tmp & UDC_ATT) ? " ATT" : "");
2370 seq_printf(s, "sof %04x\n", omap_readw(UDC_SOF));
2371 tmp = omap_readw(UDC_IRQ_EN);
2372 seq_printf(s, "irq_en %04x" FOURBITS "%s\n", tmp,
2373 (tmp & UDC_SOF_IE) ? " sof" : "",
2374 (tmp & UDC_EPN_RX_IE) ? " epn_rx" : "",
2375 (tmp & UDC_EPN_TX_IE) ? " epn_tx" : "",
2376 (tmp & UDC_DS_CHG_IE) ? " ds_chg" : "",
2377 (tmp & UDC_EP0_IE) ? " ep0" : "");
2378 tmp = omap_readw(UDC_IRQ_SRC);
2379 seq_printf(s, "irq_src %04x" EIGHTBITS "%s%s\n", tmp,
2380 (tmp & UDC_TXN_DONE) ? " txn_done" : "",
2381 (tmp & UDC_RXN_CNT) ? " rxn_cnt" : "",
2382 (tmp & UDC_RXN_EOT) ? " rxn_eot" : "",
2383 (tmp & UDC_IRQ_SOF) ? " sof" : "",
2384 (tmp & UDC_EPN_RX) ? " epn_rx" : "",
2385 (tmp & UDC_EPN_TX) ? " epn_tx" : "",
2386 (tmp & UDC_DS_CHG) ? " ds_chg" : "",
2387 (tmp & UDC_SETUP) ? " setup" : "",
2388 (tmp & UDC_EP0_RX) ? " ep0out" : "",
2389 (tmp & UDC_EP0_TX) ? " ep0in" : "");
2390 if (use_dma) {
2391 unsigned i;
2392
2393 tmp = omap_readw(UDC_DMA_IRQ_EN);
2394 seq_printf(s, "dma_irq_en %04x%s" EIGHTBITS "\n", tmp,
2395 (tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "",
2396 (tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "",
2397 (tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "",
2398
2399 (tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "",
2400 (tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "",
2401 (tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "",
2402
2403 (tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "",
2404 (tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "",
2405 (tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : "");
2406
2407 tmp = omap_readw(UDC_RXDMA_CFG);
2408 seq_printf(s, "rxdma_cfg %04x\n", tmp);
2409 if (tmp) {
2410 for (i = 0; i < 3; i++) {
2411 if ((tmp & (0x0f << (i * 4))) == 0)
2412 continue;
2413 seq_printf(s, "rxdma[%d] %04x\n", i,
2414 omap_readw(UDC_RXDMA(i + 1)));
2415 }
2416 }
2417 tmp = omap_readw(UDC_TXDMA_CFG);
2418 seq_printf(s, "txdma_cfg %04x\n", tmp);
2419 if (tmp) {
2420 for (i = 0; i < 3; i++) {
2421 if (!(tmp & (0x0f << (i * 4))))
2422 continue;
2423 seq_printf(s, "txdma[%d] %04x\n", i,
2424 omap_readw(UDC_TXDMA(i + 1)));
2425 }
2426 }
2427 }
2428
2429 tmp = omap_readw(UDC_DEVSTAT);
2430 if (tmp & UDC_ATT) {
2431 proc_ep_show(s, &udc->ep[0]);
2432 if (tmp & UDC_ADD) {
2433 list_for_each_entry(ep, &udc->gadget.ep_list,
2434 ep.ep_list) {
2435 if (ep->ep.desc)
2436 proc_ep_show(s, ep);
2437 }
2438 }
2439 }
2440 spin_unlock_irqrestore(&udc->lock, flags);
2441 return 0;
2442 }
2443
2444 static int proc_udc_open(struct inode *inode, struct file *file)
2445 {
2446 return single_open(file, proc_udc_show, NULL);
2447 }
2448
2449 static const struct file_operations proc_ops = {
2450 .owner = THIS_MODULE,
2451 .open = proc_udc_open,
2452 .read = seq_read,
2453 .llseek = seq_lseek,
2454 .release = single_release,
2455 };
2456
2457 static void create_proc_file(void)
2458 {
2459 proc_create(proc_filename, 0, NULL, &proc_ops);
2460 }
2461
2462 static void remove_proc_file(void)
2463 {
2464 remove_proc_entry(proc_filename, NULL);
2465 }
2466
2467 #else
2468
2469 static inline void create_proc_file(void) {}
2470 static inline void remove_proc_file(void) {}
2471
2472 #endif
2473
2474 /*-------------------------------------------------------------------------*/
2475
2476 /* Before this controller can enumerate, we need to pick an endpoint
2477 * configuration, or "fifo_mode" That involves allocating 2KB of packet
2478 * buffer space among the endpoints we'll be operating.
2479 *
2480 * NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when
2481 * UDC_SYSCON_1.CFG_LOCK is set can now work. We won't use that
2482 * capability yet though.
2483 */
2484 static unsigned
2485 omap_ep_setup(char *name, u8 addr, u8 type,
2486 unsigned buf, unsigned maxp, int dbuf)
2487 {
2488 struct omap_ep *ep;
2489 u16 epn_rxtx = 0;
2490
2491 /* OUT endpoints first, then IN */
2492 ep = &udc->ep[addr & 0xf];
2493 if (addr & USB_DIR_IN)
2494 ep += 16;
2495
2496 /* in case of ep init table bugs */
2497 BUG_ON(ep->name[0]);
2498
2499 /* chip setup ... bit values are same for IN, OUT */
2500 if (type == USB_ENDPOINT_XFER_ISOC) {
2501 switch (maxp) {
2502 case 8:
2503 epn_rxtx = 0 << 12;
2504 break;
2505 case 16:
2506 epn_rxtx = 1 << 12;
2507 break;
2508 case 32:
2509 epn_rxtx = 2 << 12;
2510 break;
2511 case 64:
2512 epn_rxtx = 3 << 12;
2513 break;
2514 case 128:
2515 epn_rxtx = 4 << 12;
2516 break;
2517 case 256:
2518 epn_rxtx = 5 << 12;
2519 break;
2520 case 512:
2521 epn_rxtx = 6 << 12;
2522 break;
2523 default:
2524 BUG();
2525 }
2526 epn_rxtx |= UDC_EPN_RX_ISO;
2527 dbuf = 1;
2528 } else {
2529 /* double-buffering "not supported" on 15xx,
2530 * and ignored for PIO-IN on newer chips
2531 * (for more reliable behavior)
2532 */
2533 if (!use_dma || cpu_is_omap15xx())
2534 dbuf = 0;
2535
2536 switch (maxp) {
2537 case 8:
2538 epn_rxtx = 0 << 12;
2539 break;
2540 case 16:
2541 epn_rxtx = 1 << 12;
2542 break;
2543 case 32:
2544 epn_rxtx = 2 << 12;
2545 break;
2546 case 64:
2547 epn_rxtx = 3 << 12;
2548 break;
2549 default:
2550 BUG();
2551 }
2552 if (dbuf && addr)
2553 epn_rxtx |= UDC_EPN_RX_DB;
2554 init_timer(&ep->timer);
2555 ep->timer.function = pio_out_timer;
2556 ep->timer.data = (unsigned long) ep;
2557 }
2558 if (addr)
2559 epn_rxtx |= UDC_EPN_RX_VALID;
2560 BUG_ON(buf & 0x07);
2561 epn_rxtx |= buf >> 3;
2562
2563 DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n",
2564 name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf);
2565
2566 if (addr & USB_DIR_IN)
2567 omap_writew(epn_rxtx, UDC_EP_TX(addr & 0xf));
2568 else
2569 omap_writew(epn_rxtx, UDC_EP_RX(addr));
2570
2571 /* next endpoint's buffer starts after this one's */
2572 buf += maxp;
2573 if (dbuf)
2574 buf += maxp;
2575 BUG_ON(buf > 2048);
2576
2577 /* set up driver data structures */
2578 BUG_ON(strlen(name) >= sizeof ep->name);
2579 strlcpy(ep->name, name, sizeof ep->name);
2580 INIT_LIST_HEAD(&ep->queue);
2581 INIT_LIST_HEAD(&ep->iso);
2582 ep->bEndpointAddress = addr;
2583 ep->bmAttributes = type;
2584 ep->double_buf = dbuf;
2585 ep->udc = udc;
2586
2587 ep->ep.name = ep->name;
2588 ep->ep.ops = &omap_ep_ops;
2589 ep->ep.maxpacket = ep->maxpacket = maxp;
2590 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2591
2592 return buf;
2593 }
2594
2595 static void omap_udc_release(struct device *dev)
2596 {
2597 complete(udc->done);
2598 kfree(udc);
2599 udc = NULL;
2600 }
2601
2602 static int
2603 omap_udc_setup(struct platform_device *odev, struct usb_phy *xceiv)
2604 {
2605 unsigned tmp, buf;
2606
2607 /* abolish any previous hardware state */
2608 omap_writew(0, UDC_SYSCON1);
2609 omap_writew(0, UDC_IRQ_EN);
2610 omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
2611 omap_writew(0, UDC_DMA_IRQ_EN);
2612 omap_writew(0, UDC_RXDMA_CFG);
2613 omap_writew(0, UDC_TXDMA_CFG);
2614
2615 /* UDC_PULLUP_EN gates the chip clock */
2616 /* OTG_SYSCON_1 |= DEV_IDLE_EN; */
2617
2618 udc = kzalloc(sizeof(*udc), GFP_KERNEL);
2619 if (!udc)
2620 return -ENOMEM;
2621
2622 spin_lock_init(&udc->lock);
2623
2624 udc->gadget.ops = &omap_gadget_ops;
2625 udc->gadget.ep0 = &udc->ep[0].ep;
2626 INIT_LIST_HEAD(&udc->gadget.ep_list);
2627 INIT_LIST_HEAD(&udc->iso);
2628 udc->gadget.speed = USB_SPEED_UNKNOWN;
2629 udc->gadget.max_speed = USB_SPEED_FULL;
2630 udc->gadget.name = driver_name;
2631 udc->transceiver = xceiv;
2632
2633 /* ep0 is special; put it right after the SETUP buffer */
2634 buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL,
2635 8 /* after SETUP */, 64 /* maxpacket */, 0);
2636 list_del_init(&udc->ep[0].ep.ep_list);
2637
2638 /* initially disable all non-ep0 endpoints */
2639 for (tmp = 1; tmp < 15; tmp++) {
2640 omap_writew(0, UDC_EP_RX(tmp));
2641 omap_writew(0, UDC_EP_TX(tmp));
2642 }
2643
2644 #define OMAP_BULK_EP(name, addr) \
2645 buf = omap_ep_setup(name "-bulk", addr, \
2646 USB_ENDPOINT_XFER_BULK, buf, 64, 1);
2647 #define OMAP_INT_EP(name, addr, maxp) \
2648 buf = omap_ep_setup(name "-int", addr, \
2649 USB_ENDPOINT_XFER_INT, buf, maxp, 0);
2650 #define OMAP_ISO_EP(name, addr, maxp) \
2651 buf = omap_ep_setup(name "-iso", addr, \
2652 USB_ENDPOINT_XFER_ISOC, buf, maxp, 1);
2653
2654 switch (fifo_mode) {
2655 case 0:
2656 OMAP_BULK_EP("ep1in", USB_DIR_IN | 1);
2657 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2658 OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16);
2659 break;
2660 case 1:
2661 OMAP_BULK_EP("ep1in", USB_DIR_IN | 1);
2662 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2663 OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16);
2664
2665 OMAP_BULK_EP("ep3in", USB_DIR_IN | 3);
2666 OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4);
2667 OMAP_INT_EP("ep10in", USB_DIR_IN | 10, 16);
2668
2669 OMAP_BULK_EP("ep5in", USB_DIR_IN | 5);
2670 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2671 OMAP_INT_EP("ep11in", USB_DIR_IN | 11, 16);
2672
2673 OMAP_BULK_EP("ep6in", USB_DIR_IN | 6);
2674 OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6);
2675 OMAP_INT_EP("ep12in", USB_DIR_IN | 12, 16);
2676
2677 OMAP_BULK_EP("ep7in", USB_DIR_IN | 7);
2678 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2679 OMAP_INT_EP("ep13in", USB_DIR_IN | 13, 16);
2680 OMAP_INT_EP("ep13out", USB_DIR_OUT | 13, 16);
2681
2682 OMAP_BULK_EP("ep8in", USB_DIR_IN | 8);
2683 OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8);
2684 OMAP_INT_EP("ep14in", USB_DIR_IN | 14, 16);
2685 OMAP_INT_EP("ep14out", USB_DIR_OUT | 14, 16);
2686
2687 OMAP_BULK_EP("ep15in", USB_DIR_IN | 15);
2688 OMAP_BULK_EP("ep15out", USB_DIR_OUT | 15);
2689
2690 break;
2691
2692 #ifdef USE_ISO
2693 case 2: /* mixed iso/bulk */
2694 OMAP_ISO_EP("ep1in", USB_DIR_IN | 1, 256);
2695 OMAP_ISO_EP("ep2out", USB_DIR_OUT | 2, 256);
2696 OMAP_ISO_EP("ep3in", USB_DIR_IN | 3, 128);
2697 OMAP_ISO_EP("ep4out", USB_DIR_OUT | 4, 128);
2698
2699 OMAP_INT_EP("ep5in", USB_DIR_IN | 5, 16);
2700
2701 OMAP_BULK_EP("ep6in", USB_DIR_IN | 6);
2702 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2703 OMAP_INT_EP("ep8in", USB_DIR_IN | 8, 16);
2704 break;
2705 case 3: /* mixed bulk/iso */
2706 OMAP_BULK_EP("ep1in", USB_DIR_IN | 1);
2707 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2708 OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16);
2709
2710 OMAP_BULK_EP("ep4in", USB_DIR_IN | 4);
2711 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2712 OMAP_INT_EP("ep6in", USB_DIR_IN | 6, 16);
2713
2714 OMAP_ISO_EP("ep7in", USB_DIR_IN | 7, 256);
2715 OMAP_ISO_EP("ep8out", USB_DIR_OUT | 8, 256);
2716 OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16);
2717 break;
2718 #endif
2719
2720 /* add more modes as needed */
2721
2722 default:
2723 ERR("unsupported fifo_mode #%d\n", fifo_mode);
2724 return -ENODEV;
2725 }
2726 omap_writew(UDC_CFG_LOCK|UDC_SELF_PWR, UDC_SYSCON1);
2727 INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf);
2728 return 0;
2729 }
2730
2731 static int omap_udc_probe(struct platform_device *pdev)
2732 {
2733 int status = -ENODEV;
2734 int hmc;
2735 struct usb_phy *xceiv = NULL;
2736 const char *type = NULL;
2737 struct omap_usb_config *config = pdev->dev.platform_data;
2738 struct clk *dc_clk = NULL;
2739 struct clk *hhc_clk = NULL;
2740
2741 if (cpu_is_omap7xx())
2742 use_dma = 0;
2743
2744 /* NOTE: "knows" the order of the resources! */
2745 if (!request_mem_region(pdev->resource[0].start,
2746 pdev->resource[0].end - pdev->resource[0].start + 1,
2747 driver_name)) {
2748 DBG("request_mem_region failed\n");
2749 return -EBUSY;
2750 }
2751
2752 if (cpu_is_omap16xx()) {
2753 dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
2754 hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck");
2755 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
2756 /* can't use omap_udc_enable_clock yet */
2757 clk_enable(dc_clk);
2758 clk_enable(hhc_clk);
2759 udelay(100);
2760 }
2761
2762 if (cpu_is_omap7xx()) {
2763 dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
2764 hhc_clk = clk_get(&pdev->dev, "l3_ocpi_ck");
2765 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
2766 /* can't use omap_udc_enable_clock yet */
2767 clk_enable(dc_clk);
2768 clk_enable(hhc_clk);
2769 udelay(100);
2770 }
2771
2772 INFO("OMAP UDC rev %d.%d%s\n",
2773 omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf,
2774 config->otg ? ", Mini-AB" : "");
2775
2776 /* use the mode given to us by board init code */
2777 if (cpu_is_omap15xx()) {
2778 hmc = HMC_1510;
2779 type = "(unknown)";
2780
2781 if (machine_without_vbus_sense()) {
2782 /* just set up software VBUS detect, and then
2783 * later rig it so we always report VBUS.
2784 * FIXME without really sensing VBUS, we can't
2785 * know when to turn PULLUP_EN on/off; and that
2786 * means we always "need" the 48MHz clock.
2787 */
2788 u32 tmp = omap_readl(FUNC_MUX_CTRL_0);
2789 tmp &= ~VBUS_CTRL_1510;
2790 omap_writel(tmp, FUNC_MUX_CTRL_0);
2791 tmp |= VBUS_MODE_1510;
2792 tmp &= ~VBUS_CTRL_1510;
2793 omap_writel(tmp, FUNC_MUX_CTRL_0);
2794 }
2795 } else {
2796 /* The transceiver may package some GPIO logic or handle
2797 * loopback and/or transceiverless setup; if we find one,
2798 * use it. Except for OTG, we don't _need_ to talk to one;
2799 * but not having one probably means no VBUS detection.
2800 */
2801 xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
2802 if (!IS_ERR_OR_NULL(xceiv))
2803 type = xceiv->label;
2804 else if (config->otg) {
2805 DBG("OTG requires external transceiver!\n");
2806 goto cleanup0;
2807 }
2808
2809 hmc = HMC_1610;
2810
2811 switch (hmc) {
2812 case 0: /* POWERUP DEFAULT == 0 */
2813 case 4:
2814 case 12:
2815 case 20:
2816 if (!cpu_is_omap1710()) {
2817 type = "integrated";
2818 break;
2819 }
2820 /* FALL THROUGH */
2821 case 3:
2822 case 11:
2823 case 16:
2824 case 19:
2825 case 25:
2826 if (IS_ERR_OR_NULL(xceiv)) {
2827 DBG("external transceiver not registered!\n");
2828 type = "unknown";
2829 }
2830 break;
2831 case 21: /* internal loopback */
2832 type = "loopback";
2833 break;
2834 case 14: /* transceiverless */
2835 if (cpu_is_omap1710())
2836 goto bad_on_1710;
2837 /* FALL THROUGH */
2838 case 13:
2839 case 15:
2840 type = "no";
2841 break;
2842
2843 default:
2844 bad_on_1710:
2845 ERR("unrecognized UDC HMC mode %d\n", hmc);
2846 goto cleanup0;
2847 }
2848 }
2849
2850 INFO("hmc mode %d, %s transceiver\n", hmc, type);
2851
2852 /* a "gadget" abstracts/virtualizes the controller */
2853 status = omap_udc_setup(pdev, xceiv);
2854 if (status)
2855 goto cleanup0;
2856
2857 xceiv = NULL;
2858 /* "udc" is now valid */
2859 pullup_disable(udc);
2860 #if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
2861 udc->gadget.is_otg = (config->otg != 0);
2862 #endif
2863
2864 /* starting with omap1710 es2.0, clear toggle is a separate bit */
2865 if (omap_readw(UDC_REV) >= 0x61)
2866 udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE;
2867 else
2868 udc->clr_halt = UDC_RESET_EP;
2869
2870 /* USB general purpose IRQ: ep0, state changes, dma, etc */
2871 status = request_irq(pdev->resource[1].start, omap_udc_irq,
2872 0, driver_name, udc);
2873 if (status != 0) {
2874 ERR("can't get irq %d, err %d\n",
2875 (int) pdev->resource[1].start, status);
2876 goto cleanup1;
2877 }
2878
2879 /* USB "non-iso" IRQ (PIO for all but ep0) */
2880 status = request_irq(pdev->resource[2].start, omap_udc_pio_irq,
2881 0, "omap_udc pio", udc);
2882 if (status != 0) {
2883 ERR("can't get irq %d, err %d\n",
2884 (int) pdev->resource[2].start, status);
2885 goto cleanup2;
2886 }
2887 #ifdef USE_ISO
2888 status = request_irq(pdev->resource[3].start, omap_udc_iso_irq,
2889 0, "omap_udc iso", udc);
2890 if (status != 0) {
2891 ERR("can't get irq %d, err %d\n",
2892 (int) pdev->resource[3].start, status);
2893 goto cleanup3;
2894 }
2895 #endif
2896 if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
2897 udc->dc_clk = dc_clk;
2898 udc->hhc_clk = hhc_clk;
2899 clk_disable(hhc_clk);
2900 clk_disable(dc_clk);
2901 }
2902
2903 create_proc_file();
2904 status = usb_add_gadget_udc_release(&pdev->dev, &udc->gadget,
2905 omap_udc_release);
2906 if (status)
2907 goto cleanup4;
2908
2909 return 0;
2910
2911 cleanup4:
2912 remove_proc_file();
2913
2914 #ifdef USE_ISO
2915 cleanup3:
2916 free_irq(pdev->resource[2].start, udc);
2917 #endif
2918
2919 cleanup2:
2920 free_irq(pdev->resource[1].start, udc);
2921
2922 cleanup1:
2923 kfree(udc);
2924 udc = NULL;
2925
2926 cleanup0:
2927 if (!IS_ERR_OR_NULL(xceiv))
2928 usb_put_phy(xceiv);
2929
2930 if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
2931 clk_disable(hhc_clk);
2932 clk_disable(dc_clk);
2933 clk_put(hhc_clk);
2934 clk_put(dc_clk);
2935 }
2936
2937 release_mem_region(pdev->resource[0].start,
2938 pdev->resource[0].end - pdev->resource[0].start + 1);
2939
2940 return status;
2941 }
2942
2943 static int omap_udc_remove(struct platform_device *pdev)
2944 {
2945 DECLARE_COMPLETION_ONSTACK(done);
2946
2947 if (!udc)
2948 return -ENODEV;
2949
2950 usb_del_gadget_udc(&udc->gadget);
2951 if (udc->driver)
2952 return -EBUSY;
2953
2954 udc->done = &done;
2955
2956 pullup_disable(udc);
2957 if (!IS_ERR_OR_NULL(udc->transceiver)) {
2958 usb_put_phy(udc->transceiver);
2959 udc->transceiver = NULL;
2960 }
2961 omap_writew(0, UDC_SYSCON1);
2962
2963 remove_proc_file();
2964
2965 #ifdef USE_ISO
2966 free_irq(pdev->resource[3].start, udc);
2967 #endif
2968 free_irq(pdev->resource[2].start, udc);
2969 free_irq(pdev->resource[1].start, udc);
2970
2971 if (udc->dc_clk) {
2972 if (udc->clk_requested)
2973 omap_udc_enable_clock(0);
2974 clk_put(udc->hhc_clk);
2975 clk_put(udc->dc_clk);
2976 }
2977
2978 release_mem_region(pdev->resource[0].start,
2979 pdev->resource[0].end - pdev->resource[0].start + 1);
2980
2981 wait_for_completion(&done);
2982
2983 return 0;
2984 }
2985
2986 /* suspend/resume/wakeup from sysfs (echo > power/state) or when the
2987 * system is forced into deep sleep
2988 *
2989 * REVISIT we should probably reject suspend requests when there's a host
2990 * session active, rather than disconnecting, at least on boards that can
2991 * report VBUS irqs (UDC_DEVSTAT.UDC_ATT). And in any case, we need to
2992 * make host resumes and VBUS detection trigger OMAP wakeup events; that
2993 * may involve talking to an external transceiver (e.g. isp1301).
2994 */
2995
2996 static int omap_udc_suspend(struct platform_device *dev, pm_message_t message)
2997 {
2998 u32 devstat;
2999
3000 devstat = omap_readw(UDC_DEVSTAT);
3001
3002 /* we're requesting 48 MHz clock if the pullup is enabled
3003 * (== we're attached to the host) and we're not suspended,
3004 * which would prevent entry to deep sleep...
3005 */
3006 if ((devstat & UDC_ATT) != 0 && (devstat & UDC_SUS) == 0) {
3007 WARNING("session active; suspend requires disconnect\n");
3008 omap_pullup(&udc->gadget, 0);
3009 }
3010
3011 return 0;
3012 }
3013
3014 static int omap_udc_resume(struct platform_device *dev)
3015 {
3016 DBG("resume + wakeup/SRP\n");
3017 omap_pullup(&udc->gadget, 1);
3018
3019 /* maybe the host would enumerate us if we nudged it */
3020 msleep(100);
3021 return omap_wakeup(&udc->gadget);
3022 }
3023
3024 /*-------------------------------------------------------------------------*/
3025
3026 static struct platform_driver udc_driver = {
3027 .probe = omap_udc_probe,
3028 .remove = omap_udc_remove,
3029 .suspend = omap_udc_suspend,
3030 .resume = omap_udc_resume,
3031 .driver = {
3032 .owner = THIS_MODULE,
3033 .name = (char *) driver_name,
3034 },
3035 };
3036
3037 module_platform_driver(udc_driver);
3038
3039 MODULE_DESCRIPTION(DRIVER_DESC);
3040 MODULE_LICENSE("GPL");
3041 MODULE_ALIAS("platform:omap_udc");
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