73f8c9404156be4f6d2afa9351d8bd20a14e1bf6
[linux-2.6.git] / drivers / usb / gadget / pxa2xx_udc.c
1 /*
2  * linux/drivers/usb/gadget/pxa2xx_udc.c
3  * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
4  *
5  * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
6  * Copyright (C) 2003 Robert Schwebel, Pengutronix
7  * Copyright (C) 2003 Benedikt Spranger, Pengutronix
8  * Copyright (C) 2003 David Brownell
9  * Copyright (C) 2003 Joshua Wise
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
24  *
25  */
26
27 #undef  DEBUG
28 // #define      VERBOSE DBG_VERBOSE
29
30 #include <linux/config.h>
31 #include <linux/module.h>
32 #include <linux/kernel.h>
33 #include <linux/ioport.h>
34 #include <linux/types.h>
35 #include <linux/version.h>
36 #include <linux/errno.h>
37 #include <linux/delay.h>
38 #include <linux/sched.h>
39 #include <linux/slab.h>
40 #include <linux/init.h>
41 #include <linux/timer.h>
42 #include <linux/list.h>
43 #include <linux/interrupt.h>
44 #include <linux/proc_fs.h>
45 #include <linux/mm.h>
46 #include <linux/device.h>
47 #include <linux/dma-mapping.h>
48
49 #include <asm/byteorder.h>
50 #include <asm/dma.h>
51 #include <asm/io.h>
52 #include <asm/irq.h>
53 #include <asm/system.h>
54 #include <asm/mach-types.h>
55 #include <asm/unaligned.h>
56 #include <asm/hardware.h>
57 #include <asm/arch/pxa-regs.h>
58
59 #include <linux/usb_ch9.h>
60 #include <linux/usb_gadget.h>
61
62 #include <asm/arch/udc.h>
63
64
65 /*
66  * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
67  * series processors.  The UDC for the IXP 4xx series is very similar.
68  * There are fifteen endpoints, in addition to ep0.
69  *
70  * Such controller drivers work with a gadget driver.  The gadget driver
71  * returns descriptors, implements configuration and data protocols used
72  * by the host to interact with this device, and allocates endpoints to
73  * the different protocol interfaces.  The controller driver virtualizes
74  * usb hardware so that the gadget drivers will be more portable.
75  * 
76  * This UDC hardware wants to implement a bit too much USB protocol, so
77  * it constrains the sorts of USB configuration change events that work.
78  * The errata for these chips are misleading; some "fixed" bugs from
79  * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
80  */
81
82 #define DRIVER_VERSION  "4-May-2005"
83 #define DRIVER_DESC     "PXA 25x USB Device Controller driver"
84
85
86 static const char driver_name [] = "pxa2xx_udc";
87
88 static const char ep0name [] = "ep0";
89
90
91 // #define      USE_DMA
92 // #define      USE_OUT_DMA
93 // #define      DISABLE_TEST_MODE
94
95 #ifdef CONFIG_ARCH_IXP4XX
96 #undef USE_DMA
97
98 /* cpu-specific register addresses are compiled in to this code */
99 #ifdef CONFIG_ARCH_PXA
100 #error "Can't configure both IXP and PXA"
101 #endif
102
103 #endif
104
105 #include "pxa2xx_udc.h"
106
107
108 #ifdef  USE_DMA
109 static int use_dma = 1;
110 module_param(use_dma, bool, 0);
111 MODULE_PARM_DESC (use_dma, "true to use dma");
112
113 static void dma_nodesc_handler (int dmach, void *_ep, struct pt_regs *r);
114 static void kick_dma(struct pxa2xx_ep *ep, struct pxa2xx_request *req);
115
116 #ifdef USE_OUT_DMA
117 #define DMASTR " (dma support)"
118 #else
119 #define DMASTR " (dma in)"
120 #endif
121
122 #else   /* !USE_DMA */
123 #define DMASTR " (pio only)"
124 #undef  USE_OUT_DMA
125 #endif
126
127 #ifdef  CONFIG_USB_PXA2XX_SMALL
128 #define SIZE_STR        " (small)"
129 #else
130 #define SIZE_STR        ""
131 #endif
132
133 #ifdef DISABLE_TEST_MODE
134 /* (mode == 0) == no undocumented chip tweaks
135  * (mode & 1)  == double buffer bulk IN
136  * (mode & 2)  == double buffer bulk OUT
137  * ... so mode = 3 (or 7, 15, etc) does it for both
138  */
139 static ushort fifo_mode = 0;
140 module_param(fifo_mode, ushort, 0);
141 MODULE_PARM_DESC (fifo_mode, "pxa2xx udc fifo mode");
142 #endif
143
144 /* ---------------------------------------------------------------------------
145  *      endpoint related parts of the api to the usb controller hardware,
146  *      used by gadget driver; and the inner talker-to-hardware core.
147  * ---------------------------------------------------------------------------
148  */
149
150 static void pxa2xx_ep_fifo_flush (struct usb_ep *ep);
151 static void nuke (struct pxa2xx_ep *, int status);
152
153 static void pio_irq_enable(int bEndpointAddress)
154 {
155         bEndpointAddress &= 0xf;
156         if (bEndpointAddress < 8)
157                 UICR0 &= ~(1 << bEndpointAddress);
158         else {
159                 bEndpointAddress -= 8;
160                 UICR1 &= ~(1 << bEndpointAddress);
161         }
162 }
163
164 static void pio_irq_disable(int bEndpointAddress)
165 {
166         bEndpointAddress &= 0xf;
167         if (bEndpointAddress < 8)
168                 UICR0 |= 1 << bEndpointAddress;
169         else {
170                 bEndpointAddress -= 8;
171                 UICR1 |= 1 << bEndpointAddress;
172         }
173 }
174
175 /* The UDCCR reg contains mask and interrupt status bits,
176  * so using '|=' isn't safe as it may ack an interrupt.
177  */
178 #define UDCCR_MASK_BITS         (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
179
180 static inline void udc_set_mask_UDCCR(int mask)
181 {
182         UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
183 }
184
185 static inline void udc_clear_mask_UDCCR(int mask)
186 {
187         UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
188 }
189
190 static inline void udc_ack_int_UDCCR(int mask)
191 {
192         /* udccr contains the bits we dont want to change */
193         __u32 udccr = UDCCR & UDCCR_MASK_BITS;
194
195         UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
196 }
197
198 /*
199  * endpoint enable/disable
200  *
201  * we need to verify the descriptors used to enable endpoints.  since pxa2xx
202  * endpoint configurations are fixed, and are pretty much always enabled,
203  * there's not a lot to manage here.
204  *
205  * because pxa2xx can't selectively initialize bulk (or interrupt) endpoints,
206  * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
207  * for a single interface (with only the default altsetting) and for gadget
208  * drivers that don't halt endpoints (not reset by set_interface).  that also
209  * means that if you use ISO, you must violate the USB spec rule that all
210  * iso endpoints must be in non-default altsettings.
211  */
212 static int pxa2xx_ep_enable (struct usb_ep *_ep,
213                 const struct usb_endpoint_descriptor *desc)
214 {
215         struct pxa2xx_ep        *ep;
216         struct pxa2xx_udc       *dev;
217
218         ep = container_of (_ep, struct pxa2xx_ep, ep);
219         if (!_ep || !desc || ep->desc || _ep->name == ep0name
220                         || desc->bDescriptorType != USB_DT_ENDPOINT
221                         || ep->bEndpointAddress != desc->bEndpointAddress
222                         || ep->fifo_size < le16_to_cpu
223                                                 (desc->wMaxPacketSize)) {
224                 DMSG("%s, bad ep or descriptor\n", __FUNCTION__);
225                 return -EINVAL;
226         }
227
228         /* xfer types must match, except that interrupt ~= bulk */
229         if (ep->bmAttributes != desc->bmAttributes
230                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
231                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
232                 DMSG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
233                 return -EINVAL;
234         }
235
236         /* hardware _could_ do smaller, but driver doesn't */
237         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
238                                 && le16_to_cpu (desc->wMaxPacketSize)
239                                                 != BULK_FIFO_SIZE)
240                         || !desc->wMaxPacketSize) {
241                 DMSG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
242                 return -ERANGE;
243         }
244
245         dev = ep->dev;
246         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
247                 DMSG("%s, bogus device state\n", __FUNCTION__);
248                 return -ESHUTDOWN;
249         }
250
251         ep->desc = desc;
252         ep->dma = -1;
253         ep->stopped = 0;
254         ep->pio_irqs = ep->dma_irqs = 0;
255         ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);
256
257         /* flush fifo (mostly for OUT buffers) */
258         pxa2xx_ep_fifo_flush (_ep);
259
260         /* ... reset halt state too, if we could ... */
261
262 #ifdef  USE_DMA
263         /* for (some) bulk and ISO endpoints, try to get a DMA channel and
264          * bind it to the endpoint.  otherwise use PIO. 
265          */
266         switch (ep->bmAttributes) {
267         case USB_ENDPOINT_XFER_ISOC:
268                 if (le16_to_cpu(desc->wMaxPacketSize) % 32)
269                         break;
270                 // fall through
271         case USB_ENDPOINT_XFER_BULK:
272                 if (!use_dma || !ep->reg_drcmr)
273                         break;
274                 ep->dma = pxa_request_dma ((char *)_ep->name,
275                                 (le16_to_cpu (desc->wMaxPacketSize) > 64)
276                                         ? DMA_PRIO_MEDIUM /* some iso */
277                                         : DMA_PRIO_LOW,
278                                 dma_nodesc_handler, ep);
279                 if (ep->dma >= 0) {
280                         *ep->reg_drcmr = DRCMR_MAPVLD | ep->dma;
281                         DMSG("%s using dma%d\n", _ep->name, ep->dma);
282                 }
283         }
284 #endif
285
286         DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
287         return 0;
288 }
289
290 static int pxa2xx_ep_disable (struct usb_ep *_ep)
291 {
292         struct pxa2xx_ep        *ep;
293         unsigned long           flags;
294
295         ep = container_of (_ep, struct pxa2xx_ep, ep);
296         if (!_ep || !ep->desc) {
297                 DMSG("%s, %s not enabled\n", __FUNCTION__,
298                         _ep ? ep->ep.name : NULL);
299                 return -EINVAL;
300         }
301         local_irq_save(flags);
302
303         nuke (ep, -ESHUTDOWN);
304
305 #ifdef  USE_DMA
306         if (ep->dma >= 0) {
307                 *ep->reg_drcmr = 0;
308                 pxa_free_dma (ep->dma);
309                 ep->dma = -1;
310         }
311 #endif
312
313         /* flush fifo (mostly for IN buffers) */
314         pxa2xx_ep_fifo_flush (_ep);
315
316         ep->desc = NULL;
317         ep->stopped = 1;
318
319         local_irq_restore(flags);
320         DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
321         return 0;
322 }
323
324 /*-------------------------------------------------------------------------*/
325
326 /* for the pxa2xx, these can just wrap kmalloc/kfree.  gadget drivers
327  * must still pass correctly initialized endpoints, since other controller
328  * drivers may care about how it's currently set up (dma issues etc).
329  */
330
331 /*
332  *      pxa2xx_ep_alloc_request - allocate a request data structure
333  */
334 static struct usb_request *
335 pxa2xx_ep_alloc_request (struct usb_ep *_ep, unsigned gfp_flags)
336 {
337         struct pxa2xx_request *req;
338
339         req = kmalloc (sizeof *req, gfp_flags);
340         if (!req)
341                 return NULL;
342
343         memset (req, 0, sizeof *req);
344         INIT_LIST_HEAD (&req->queue);
345         return &req->req;
346 }
347
348
349 /*
350  *      pxa2xx_ep_free_request - deallocate a request data structure
351  */
352 static void
353 pxa2xx_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
354 {
355         struct pxa2xx_request   *req;
356
357         req = container_of (_req, struct pxa2xx_request, req);
358         WARN_ON (!list_empty (&req->queue));
359         kfree(req);
360 }
361
362
363 /* PXA cache needs flushing with DMA I/O (it's dma-incoherent), but there's
364  * no device-affinity and the heap works perfectly well for i/o buffers.
365  * It wastes much less memory than dma_alloc_coherent() would, and even
366  * prevents cacheline (32 bytes wide) sharing problems.
367  */
368 static void *
369 pxa2xx_ep_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
370         dma_addr_t *dma, unsigned gfp_flags)
371 {
372         char                    *retval;
373
374         retval = kmalloc (bytes, gfp_flags & ~(__GFP_DMA|__GFP_HIGHMEM));
375         if (retval)
376 #ifdef  USE_DMA
377                 *dma = virt_to_bus (retval);
378 #else
379                 *dma = (dma_addr_t)~0;
380 #endif
381         return retval;
382 }
383
384 static void
385 pxa2xx_ep_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma,
386                 unsigned bytes)
387 {
388         kfree (buf);
389 }
390
391 /*-------------------------------------------------------------------------*/
392
393 /*
394  *      done - retire a request; caller blocked irqs
395  */
396 static void done(struct pxa2xx_ep *ep, struct pxa2xx_request *req, int status)
397 {
398         unsigned                stopped = ep->stopped;
399
400         list_del_init(&req->queue);
401
402         if (likely (req->req.status == -EINPROGRESS))
403                 req->req.status = status;
404         else
405                 status = req->req.status;
406
407         if (status && status != -ESHUTDOWN)
408                 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n",
409                         ep->ep.name, &req->req, status,
410                         req->req.actual, req->req.length);
411
412         /* don't modify queue heads during completion callback */
413         ep->stopped = 1;
414         req->req.complete(&ep->ep, &req->req);
415         ep->stopped = stopped;
416 }
417
418
419 static inline void ep0_idle (struct pxa2xx_udc *dev)
420 {
421         dev->ep0state = EP0_IDLE;
422 }
423
424 static int
425 write_packet(volatile unsigned long *uddr, struct pxa2xx_request *req, unsigned max)
426 {
427         u8              *buf;
428         unsigned        length, count;
429
430         buf = req->req.buf + req->req.actual;
431         prefetch(buf);
432
433         /* how big will this packet be? */
434         length = min(req->req.length - req->req.actual, max);
435         req->req.actual += length;
436
437         count = length;
438         while (likely(count--))
439                 *uddr = *buf++;
440
441         return length;
442 }
443
444 /*
445  * write to an IN endpoint fifo, as many packets as possible.
446  * irqs will use this to write the rest later.
447  * caller guarantees at least one packet buffer is ready (or a zlp).
448  */
449 static int
450 write_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
451 {
452         unsigned                max;
453
454         max = le16_to_cpu(ep->desc->wMaxPacketSize);
455         do {
456                 unsigned        count;
457                 int             is_last, is_short;
458
459                 count = write_packet(ep->reg_uddr, req, max);
460
461                 /* last packet is usually short (or a zlp) */
462                 if (unlikely (count != max))
463                         is_last = is_short = 1;
464                 else {
465                         if (likely(req->req.length != req->req.actual)
466                                         || req->req.zero)
467                                 is_last = 0;
468                         else
469                                 is_last = 1;
470                         /* interrupt/iso maxpacket may not fill the fifo */
471                         is_short = unlikely (max < ep->fifo_size);
472                 }
473
474                 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
475                         ep->ep.name, count,
476                         is_last ? "/L" : "", is_short ? "/S" : "",
477                         req->req.length - req->req.actual, req);
478
479                 /* let loose that packet. maybe try writing another one,
480                  * double buffering might work.  TSP, TPC, and TFS
481                  * bit values are the same for all normal IN endpoints.
482                  */
483                 *ep->reg_udccs = UDCCS_BI_TPC;
484                 if (is_short)
485                         *ep->reg_udccs = UDCCS_BI_TSP;
486
487                 /* requests complete when all IN data is in the FIFO */
488                 if (is_last) {
489                         done (ep, req, 0);
490                         if (list_empty(&ep->queue) || unlikely(ep->dma >= 0)) {
491                                 pio_irq_disable (ep->bEndpointAddress);
492 #ifdef USE_DMA
493                                 /* unaligned data and zlps couldn't use dma */
494                                 if (unlikely(!list_empty(&ep->queue))) {
495                                         req = list_entry(ep->queue.next,
496                                                 struct pxa2xx_request, queue);
497                                         kick_dma(ep,req);
498                                         return 0;
499                                 }
500 #endif
501                         }
502                         return 1;
503                 }
504
505                 // TODO experiment: how robust can fifo mode tweaking be?
506                 // double buffering is off in the default fifo mode, which
507                 // prevents TFS from being set here.
508
509         } while (*ep->reg_udccs & UDCCS_BI_TFS);
510         return 0;
511 }
512
513 /* caller asserts req->pending (ep0 irq status nyet cleared); starts
514  * ep0 data stage.  these chips want very simple state transitions.
515  */
516 static inline
517 void ep0start(struct pxa2xx_udc *dev, u32 flags, const char *tag)
518 {
519         UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
520         USIR0 = USIR0_IR0;
521         dev->req_pending = 0;
522         DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
523                 __FUNCTION__, tag, UDCCS0, flags);
524 }
525
526 static int
527 write_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
528 {
529         unsigned        count;
530         int             is_short;
531
532         count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
533         ep->dev->stats.write.bytes += count;
534
535         /* last packet "must be" short (or a zlp) */
536         is_short = (count != EP0_FIFO_SIZE);
537
538         DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
539                 req->req.length - req->req.actual, req);
540
541         if (unlikely (is_short)) {
542                 if (ep->dev->req_pending)
543                         ep0start(ep->dev, UDCCS0_IPR, "short IN");
544                 else
545                         UDCCS0 = UDCCS0_IPR;
546
547                 count = req->req.length;
548                 done (ep, req, 0);
549                 ep0_idle(ep->dev);
550 #if 1
551                 /* This seems to get rid of lost status irqs in some cases:
552                  * host responds quickly, or next request involves config
553                  * change automagic, or should have been hidden, or ...
554                  *
555                  * FIXME get rid of all udelays possible...
556                  */
557                 if (count >= EP0_FIFO_SIZE) {
558                         count = 100;
559                         do {
560                                 if ((UDCCS0 & UDCCS0_OPR) != 0) {
561                                         /* clear OPR, generate ack */
562                                         UDCCS0 = UDCCS0_OPR;
563                                         break;
564                                 }
565                                 count--;
566                                 udelay(1);
567                         } while (count);
568                 }
569 #endif
570         } else if (ep->dev->req_pending)
571                 ep0start(ep->dev, 0, "IN");
572         return is_short;
573 }
574
575
576 /*
577  * read_fifo -  unload packet(s) from the fifo we use for usb OUT
578  * transfers and put them into the request.  caller should have made
579  * sure there's at least one packet ready.
580  *
581  * returns true if the request completed because of short packet or the
582  * request buffer having filled (and maybe overran till end-of-packet).
583  */
584 static int
585 read_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
586 {
587         for (;;) {
588                 u32             udccs;
589                 u8              *buf;
590                 unsigned        bufferspace, count, is_short;
591
592                 /* make sure there's a packet in the FIFO.
593                  * UDCCS_{BO,IO}_RPC are all the same bit value.
594                  * UDCCS_{BO,IO}_RNE are all the same bit value.
595                  */
596                 udccs = *ep->reg_udccs;
597                 if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
598                         break;
599                 buf = req->req.buf + req->req.actual;
600                 prefetchw(buf);
601                 bufferspace = req->req.length - req->req.actual;
602
603                 /* read all bytes from this packet */
604                 if (likely (udccs & UDCCS_BO_RNE)) {
605                         count = 1 + (0x0ff & *ep->reg_ubcr);
606                         req->req.actual += min (count, bufferspace);
607                 } else /* zlp */
608                         count = 0;
609                 is_short = (count < ep->ep.maxpacket);
610                 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
611                         ep->ep.name, udccs, count,
612                         is_short ? "/S" : "",
613                         req, req->req.actual, req->req.length);
614                 while (likely (count-- != 0)) {
615                         u8      byte = (u8) *ep->reg_uddr;
616
617                         if (unlikely (bufferspace == 0)) {
618                                 /* this happens when the driver's buffer
619                                  * is smaller than what the host sent.
620                                  * discard the extra data.
621                                  */
622                                 if (req->req.status != -EOVERFLOW)
623                                         DMSG("%s overflow %d\n",
624                                                 ep->ep.name, count);
625                                 req->req.status = -EOVERFLOW;
626                         } else {
627                                 *buf++ = byte;
628                                 bufferspace--;
629                         }
630                 }
631                 *ep->reg_udccs =  UDCCS_BO_RPC;
632                 /* RPC/RSP/RNE could now reflect the other packet buffer */
633
634                 /* iso is one request per packet */
635                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
636                         if (udccs & UDCCS_IO_ROF)
637                                 req->req.status = -EHOSTUNREACH;
638                         /* more like "is_done" */
639                         is_short = 1;
640                 }
641
642                 /* completion */
643                 if (is_short || req->req.actual == req->req.length) {
644                         done (ep, req, 0);
645                         if (list_empty(&ep->queue))
646                                 pio_irq_disable (ep->bEndpointAddress);
647                         return 1;
648                 }
649
650                 /* finished that packet.  the next one may be waiting... */
651         }
652         return 0;
653 }
654
655 /*
656  * special ep0 version of the above.  no UBCR0 or double buffering; status
657  * handshaking is magic.  most device protocols don't need control-OUT.
658  * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
659  * protocols do use them.
660  */
661 static int
662 read_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
663 {
664         u8              *buf, byte;
665         unsigned        bufferspace;
666
667         buf = req->req.buf + req->req.actual;
668         bufferspace = req->req.length - req->req.actual;
669
670         while (UDCCS0 & UDCCS0_RNE) {
671                 byte = (u8) UDDR0;
672
673                 if (unlikely (bufferspace == 0)) {
674                         /* this happens when the driver's buffer
675                          * is smaller than what the host sent.
676                          * discard the extra data.
677                          */
678                         if (req->req.status != -EOVERFLOW)
679                                 DMSG("%s overflow\n", ep->ep.name);
680                         req->req.status = -EOVERFLOW;
681                 } else {
682                         *buf++ = byte;
683                         req->req.actual++;
684                         bufferspace--;
685                 }
686         }
687
688         UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
689
690         /* completion */
691         if (req->req.actual >= req->req.length)
692                 return 1;
693
694         /* finished that packet.  the next one may be waiting... */
695         return 0;
696 }
697
698 #ifdef  USE_DMA
699
700 #define MAX_IN_DMA      ((DCMD_LENGTH + 1) - BULK_FIFO_SIZE)
701
702 static void
703 start_dma_nodesc(struct pxa2xx_ep *ep, struct pxa2xx_request *req, int is_in)
704 {
705         u32     dcmd = req->req.length;
706         u32     buf = req->req.dma;
707         u32     fifo = io_v2p ((u32)ep->reg_uddr);
708
709         /* caller guarantees there's a packet or more remaining
710          *  - IN may end with a short packet (TSP set separately),
711          *  - OUT is always full length
712          */
713         buf += req->req.actual;
714         dcmd -= req->req.actual;
715         ep->dma_fixup = 0;
716
717         /* no-descriptor mode can be simple for bulk-in, iso-in, iso-out */
718         DCSR(ep->dma) = DCSR_NODESC;
719         if (is_in) {
720                 DSADR(ep->dma) = buf;
721                 DTADR(ep->dma) = fifo;
722                 if (dcmd > MAX_IN_DMA)
723                         dcmd = MAX_IN_DMA;
724                 else
725                         ep->dma_fixup = (dcmd % ep->ep.maxpacket) != 0;
726                 dcmd |= DCMD_BURST32 | DCMD_WIDTH1
727                         | DCMD_FLOWTRG | DCMD_INCSRCADDR;
728         } else {
729 #ifdef USE_OUT_DMA
730                 DSADR(ep->dma) = fifo;
731                 DTADR(ep->dma) = buf;
732                 if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
733                         dcmd = ep->ep.maxpacket;
734                 dcmd |= DCMD_BURST32 | DCMD_WIDTH1
735                         | DCMD_FLOWSRC | DCMD_INCTRGADDR;
736 #endif
737         }
738         DCMD(ep->dma) = dcmd;
739         DCSR(ep->dma) = DCSR_RUN | DCSR_NODESC
740                 | (unlikely(is_in)
741                         ? DCSR_STOPIRQEN        /* use dma_nodesc_handler() */
742                         : 0);                   /* use handle_ep() */
743 }
744
745 static void kick_dma(struct pxa2xx_ep *ep, struct pxa2xx_request *req)
746 {
747         int     is_in = ep->bEndpointAddress & USB_DIR_IN;
748
749         if (is_in) {
750                 /* unaligned tx buffers and zlps only work with PIO */
751                 if ((req->req.dma & 0x0f) != 0
752                                 || unlikely((req->req.length - req->req.actual)
753                                                 == 0)) {
754                         pio_irq_enable(ep->bEndpointAddress);
755                         if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0)
756                                 (void) write_fifo(ep, req);
757                 } else {
758                         start_dma_nodesc(ep, req, USB_DIR_IN);
759                 }
760         } else {
761                 if ((req->req.length - req->req.actual) < ep->ep.maxpacket) {
762                         DMSG("%s short dma read...\n", ep->ep.name);
763                         /* we're always set up for pio out */
764                         read_fifo (ep, req);
765                 } else {
766                         *ep->reg_udccs = UDCCS_BO_DME
767                                 | (*ep->reg_udccs & UDCCS_BO_FST);
768                         start_dma_nodesc(ep, req, USB_DIR_OUT);
769                 }
770         }
771 }
772
773 static void cancel_dma(struct pxa2xx_ep *ep)
774 {
775         struct pxa2xx_request   *req;
776         u32                     tmp;
777
778         if (DCSR(ep->dma) == 0 || list_empty(&ep->queue))
779                 return;
780
781         DCSR(ep->dma) = 0;
782         while ((DCSR(ep->dma) & DCSR_STOPSTATE) == 0)
783                 cpu_relax();
784
785         req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
786         tmp = DCMD(ep->dma) & DCMD_LENGTH;
787         req->req.actual = req->req.length - (tmp & DCMD_LENGTH);
788
789         /* the last tx packet may be incomplete, so flush the fifo.
790          * FIXME correct req.actual if we can
791          */
792         if (ep->bEndpointAddress & USB_DIR_IN)
793                 *ep->reg_udccs = UDCCS_BI_FTF;
794 }
795
796 /* dma channel stopped ... normal tx end (IN), or on error (IN/OUT) */
797 static void dma_nodesc_handler(int dmach, void *_ep, struct pt_regs *r)
798 {
799         struct pxa2xx_ep        *ep = _ep;
800         struct pxa2xx_request   *req;
801         u32                     tmp, completed;
802
803         local_irq_disable();
804
805         req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
806
807         ep->dma_irqs++;
808         ep->dev->stats.irqs++;
809         HEX_DISPLAY(ep->dev->stats.irqs);
810
811         /* ack/clear */
812         tmp = DCSR(ep->dma);
813         DCSR(ep->dma) = tmp;
814         if ((tmp & DCSR_STOPSTATE) == 0
815                         || (DDADR(ep->dma) & DDADR_STOP) != 0) {
816                 DBG(DBG_VERBOSE, "%s, dcsr %08x ddadr %08x\n",
817                         ep->ep.name, DCSR(ep->dma), DDADR(ep->dma));
818                 goto done;
819         }
820         DCSR(ep->dma) = 0;      /* clear DCSR_STOPSTATE */
821
822         /* update transfer status */
823         completed = tmp & DCSR_BUSERR;
824         if (ep->bEndpointAddress & USB_DIR_IN)
825                 tmp = DSADR(ep->dma);
826         else
827                 tmp = DTADR(ep->dma);
828         req->req.actual = tmp - req->req.dma;
829
830         /* FIXME seems we sometimes see partial transfers... */
831
832         if (unlikely(completed != 0))
833                 req->req.status = -EIO;
834         else if (req->req.actual) {
835                 /* these registers have zeroes in low bits; they miscount
836                  * some (end-of-transfer) short packets:  tx 14 as tx 12
837                  */
838                 if (ep->dma_fixup)
839                         req->req.actual = min(req->req.actual + 3,
840                                                 req->req.length);
841
842                 tmp = (req->req.length - req->req.actual);
843                 completed = (tmp == 0);
844                 if (completed && (ep->bEndpointAddress & USB_DIR_IN)) {
845
846                         /* maybe validate final short packet ... */
847                         if ((req->req.actual % ep->ep.maxpacket) != 0)
848                                 *ep->reg_udccs = UDCCS_BI_TSP/*|UDCCS_BI_TPC*/;
849
850                         /* ... or zlp, using pio fallback */
851                         else if (ep->bmAttributes == USB_ENDPOINT_XFER_BULK
852                                         && req->req.zero) {
853                                 DMSG("%s zlp terminate ...\n", ep->ep.name);
854                                 completed = 0;
855                         }
856                 }
857         }
858
859         if (likely(completed)) {
860                 done(ep, req, 0);
861
862                 /* maybe re-activate after completion */
863                 if (ep->stopped || list_empty(&ep->queue))
864                         goto done;
865                 req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
866         }
867         kick_dma(ep, req);
868 done:
869         local_irq_enable();
870 }
871
872 #endif
873
874 /*-------------------------------------------------------------------------*/
875
876 static int
877 pxa2xx_ep_queue(struct usb_ep *_ep, struct usb_request *_req, unsigned gfp_flags)
878 {
879         struct pxa2xx_request   *req;
880         struct pxa2xx_ep        *ep;
881         struct pxa2xx_udc       *dev;
882         unsigned long           flags;
883
884         req = container_of(_req, struct pxa2xx_request, req);
885         if (unlikely (!_req || !_req->complete || !_req->buf
886                         || !list_empty(&req->queue))) {
887                 DMSG("%s, bad params\n", __FUNCTION__);
888                 return -EINVAL;
889         }
890
891         ep = container_of(_ep, struct pxa2xx_ep, ep);
892         if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
893                 DMSG("%s, bad ep\n", __FUNCTION__);
894                 return -EINVAL;
895         }
896
897         dev = ep->dev;
898         if (unlikely (!dev->driver
899                         || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
900                 DMSG("%s, bogus device state\n", __FUNCTION__);
901                 return -ESHUTDOWN;
902         }
903
904         /* iso is always one packet per request, that's the only way
905          * we can report per-packet status.  that also helps with dma.
906          */
907         if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
908                         && req->req.length > le16_to_cpu
909                                                 (ep->desc->wMaxPacketSize)))
910                 return -EMSGSIZE;
911
912 #ifdef  USE_DMA
913         // FIXME caller may already have done the dma mapping
914         if (ep->dma >= 0) {
915                 _req->dma = dma_map_single(dev->dev,
916                         _req->buf, _req->length,
917                         ((ep->bEndpointAddress & USB_DIR_IN) != 0)
918                                 ? DMA_TO_DEVICE
919                                 : DMA_FROM_DEVICE);
920         }
921 #endif
922
923         DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
924              _ep->name, _req, _req->length, _req->buf);
925
926         local_irq_save(flags);
927
928         _req->status = -EINPROGRESS;
929         _req->actual = 0;
930
931         /* kickstart this i/o queue? */
932         if (list_empty(&ep->queue) && !ep->stopped) {
933                 if (ep->desc == 0 /* ep0 */) {
934                         unsigned        length = _req->length;
935
936                         switch (dev->ep0state) {
937                         case EP0_IN_DATA_PHASE:
938                                 dev->stats.write.ops++;
939                                 if (write_ep0_fifo(ep, req))
940                                         req = NULL;
941                                 break;
942
943                         case EP0_OUT_DATA_PHASE:
944                                 dev->stats.read.ops++;
945                                 /* messy ... */
946                                 if (dev->req_config) {
947                                         DBG(DBG_VERBOSE, "ep0 config ack%s\n",
948                                                 dev->has_cfr ?  "" : " raced");
949                                         if (dev->has_cfr)
950                                                 UDCCFR = UDCCFR_AREN|UDCCFR_ACM
951                                                         |UDCCFR_MB1;
952                                         done(ep, req, 0);
953                                         dev->ep0state = EP0_END_XFER;
954                                         local_irq_restore (flags);
955                                         return 0;
956                                 }
957                                 if (dev->req_pending)
958                                         ep0start(dev, UDCCS0_IPR, "OUT");
959                                 if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
960                                                 && read_ep0_fifo(ep, req))) {
961                                         ep0_idle(dev);
962                                         done(ep, req, 0);
963                                         req = NULL;
964                                 }
965                                 break;
966
967                         default:
968                                 DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
969                                 local_irq_restore (flags);
970                                 return -EL2HLT;
971                         }
972 #ifdef  USE_DMA
973                 /* either start dma or prime pio pump */
974                 } else if (ep->dma >= 0) {
975                         kick_dma(ep, req);
976 #endif
977                 /* can the FIFO can satisfy the request immediately? */
978                 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
979                         if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
980                                         && write_fifo(ep, req))
981                                 req = NULL;
982                 } else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
983                                 && read_fifo(ep, req)) {
984                         req = NULL;
985                 }
986
987                 if (likely (req && ep->desc) && ep->dma < 0)
988                         pio_irq_enable(ep->bEndpointAddress);
989         }
990
991         /* pio or dma irq handler advances the queue. */
992         if (likely (req != 0))
993                 list_add_tail(&req->queue, &ep->queue);
994         local_irq_restore(flags);
995
996         return 0;
997 }
998
999
1000 /*
1001  *      nuke - dequeue ALL requests
1002  */
1003 static void nuke(struct pxa2xx_ep *ep, int status)
1004 {
1005         struct pxa2xx_request *req;
1006
1007         /* called with irqs blocked */
1008 #ifdef  USE_DMA
1009         if (ep->dma >= 0 && !ep->stopped)
1010                 cancel_dma(ep);
1011 #endif
1012         while (!list_empty(&ep->queue)) {
1013                 req = list_entry(ep->queue.next,
1014                                 struct pxa2xx_request,
1015                                 queue);
1016                 done(ep, req, status);
1017         }
1018         if (ep->desc)
1019                 pio_irq_disable (ep->bEndpointAddress);
1020 }
1021
1022
1023 /* dequeue JUST ONE request */
1024 static int pxa2xx_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1025 {
1026         struct pxa2xx_ep        *ep;
1027         struct pxa2xx_request   *req;
1028         unsigned long           flags;
1029
1030         ep = container_of(_ep, struct pxa2xx_ep, ep);
1031         if (!_ep || ep->ep.name == ep0name)
1032                 return -EINVAL;
1033
1034         local_irq_save(flags);
1035
1036         /* make sure it's actually queued on this endpoint */
1037         list_for_each_entry (req, &ep->queue, queue) {
1038                 if (&req->req == _req)
1039                         break;
1040         }
1041         if (&req->req != _req) {
1042                 local_irq_restore(flags);
1043                 return -EINVAL;
1044         }
1045
1046 #ifdef  USE_DMA
1047         if (ep->dma >= 0 && ep->queue.next == &req->queue && !ep->stopped) {
1048                 cancel_dma(ep);
1049                 done(ep, req, -ECONNRESET);
1050                 /* restart i/o */
1051                 if (!list_empty(&ep->queue)) {
1052                         req = list_entry(ep->queue.next,
1053                                         struct pxa2xx_request, queue);
1054                         kick_dma(ep, req);
1055                 }
1056         } else
1057 #endif
1058                 done(ep, req, -ECONNRESET);
1059
1060         local_irq_restore(flags);
1061         return 0;
1062 }
1063
1064 /*-------------------------------------------------------------------------*/
1065
1066 static int pxa2xx_ep_set_halt(struct usb_ep *_ep, int value)
1067 {
1068         struct pxa2xx_ep        *ep;
1069         unsigned long           flags;
1070
1071         ep = container_of(_ep, struct pxa2xx_ep, ep);
1072         if (unlikely (!_ep
1073                         || (!ep->desc && ep->ep.name != ep0name))
1074                         || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
1075                 DMSG("%s, bad ep\n", __FUNCTION__);
1076                 return -EINVAL;
1077         }
1078         if (value == 0) {
1079                 /* this path (reset toggle+halt) is needed to implement
1080                  * SET_INTERFACE on normal hardware.  but it can't be
1081                  * done from software on the PXA UDC, and the hardware
1082                  * forgets to do it as part of SET_INTERFACE automagic.
1083                  */
1084                 DMSG("only host can clear %s halt\n", _ep->name);
1085                 return -EROFS;
1086         }
1087
1088         local_irq_save(flags);
1089
1090         if ((ep->bEndpointAddress & USB_DIR_IN) != 0
1091                         && ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
1092                            || !list_empty(&ep->queue))) {
1093                 local_irq_restore(flags);
1094                 return -EAGAIN;
1095         }
1096
1097         /* FST bit is the same for control, bulk in, bulk out, interrupt in */
1098         *ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
1099
1100         /* ep0 needs special care */
1101         if (!ep->desc) {
1102                 start_watchdog(ep->dev);
1103                 ep->dev->req_pending = 0;
1104                 ep->dev->ep0state = EP0_STALL;
1105
1106         /* and bulk/intr endpoints like dropping stalls too */
1107         } else {
1108                 unsigned i;
1109                 for (i = 0; i < 1000; i += 20) {
1110                         if (*ep->reg_udccs & UDCCS_BI_SST)
1111                                 break;
1112                         udelay(20);
1113                 }
1114         }
1115         local_irq_restore(flags);
1116
1117         DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
1118         return 0;
1119 }
1120
1121 static int pxa2xx_ep_fifo_status(struct usb_ep *_ep)
1122 {
1123         struct pxa2xx_ep        *ep;
1124
1125         ep = container_of(_ep, struct pxa2xx_ep, ep);
1126         if (!_ep) {
1127                 DMSG("%s, bad ep\n", __FUNCTION__);
1128                 return -ENODEV;
1129         }
1130         /* pxa can't report unclaimed bytes from IN fifos */
1131         if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
1132                 return -EOPNOTSUPP;
1133         if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
1134                         || (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
1135                 return 0;
1136         else
1137                 return (*ep->reg_ubcr & 0xfff) + 1;
1138 }
1139
1140 static void pxa2xx_ep_fifo_flush(struct usb_ep *_ep)
1141 {
1142         struct pxa2xx_ep        *ep;
1143
1144         ep = container_of(_ep, struct pxa2xx_ep, ep);
1145         if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
1146                 DMSG("%s, bad ep\n", __FUNCTION__);
1147                 return;
1148         }
1149
1150         /* toggle and halt bits stay unchanged */
1151
1152         /* for OUT, just read and discard the FIFO contents. */
1153         if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
1154                 while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
1155                         (void) *ep->reg_uddr;
1156                 return;
1157         }
1158
1159         /* most IN status is the same, but ISO can't stall */
1160         *ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
1161                 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
1162                         ? 0 : UDCCS_BI_SST;
1163 }
1164
1165
1166 static struct usb_ep_ops pxa2xx_ep_ops = {
1167         .enable         = pxa2xx_ep_enable,
1168         .disable        = pxa2xx_ep_disable,
1169
1170         .alloc_request  = pxa2xx_ep_alloc_request,
1171         .free_request   = pxa2xx_ep_free_request,
1172
1173         .alloc_buffer   = pxa2xx_ep_alloc_buffer,
1174         .free_buffer    = pxa2xx_ep_free_buffer,
1175
1176         .queue          = pxa2xx_ep_queue,
1177         .dequeue        = pxa2xx_ep_dequeue,
1178
1179         .set_halt       = pxa2xx_ep_set_halt,
1180         .fifo_status    = pxa2xx_ep_fifo_status,
1181         .fifo_flush     = pxa2xx_ep_fifo_flush,
1182 };
1183
1184
1185 /* ---------------------------------------------------------------------------
1186  *      device-scoped parts of the api to the usb controller hardware
1187  * ---------------------------------------------------------------------------
1188  */
1189
1190 static int pxa2xx_udc_get_frame(struct usb_gadget *_gadget)
1191 {
1192         return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
1193 }
1194
1195 static int pxa2xx_udc_wakeup(struct usb_gadget *_gadget)
1196 {
1197         /* host may not have enabled remote wakeup */
1198         if ((UDCCS0 & UDCCS0_DRWF) == 0)
1199                 return -EHOSTUNREACH;
1200         udc_set_mask_UDCCR(UDCCR_RSM);
1201         return 0;
1202 }
1203
1204 static void stop_activity(struct pxa2xx_udc *, struct usb_gadget_driver *);
1205 static void udc_enable (struct pxa2xx_udc *);
1206 static void udc_disable(struct pxa2xx_udc *);
1207
1208 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
1209  * in active use.  
1210  */
1211 static int pullup(struct pxa2xx_udc *udc, int is_active)
1212 {
1213         is_active = is_active && udc->vbus && udc->pullup;
1214         DMSG("%s\n", is_active ? "active" : "inactive");
1215         if (is_active)
1216                 udc_enable(udc);
1217         else {
1218                 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1219                         DMSG("disconnect %s\n", udc->driver
1220                                 ? udc->driver->driver.name
1221                                 : "(no driver)");
1222                         stop_activity(udc, udc->driver);
1223                 }
1224                 udc_disable(udc);
1225         }
1226         return 0;
1227 }
1228
1229 /* VBUS reporting logically comes from a transceiver */
1230 static int pxa2xx_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1231 {
1232         struct pxa2xx_udc       *udc;
1233
1234         udc = container_of(_gadget, struct pxa2xx_udc, gadget);
1235         udc->vbus = is_active = (is_active != 0);
1236         DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
1237         pullup(udc, is_active);
1238         return 0;
1239 }
1240
1241 /* drivers may have software control over D+ pullup */
1242 static int pxa2xx_udc_pullup(struct usb_gadget *_gadget, int is_active)
1243 {
1244         struct pxa2xx_udc       *udc;
1245
1246         udc = container_of(_gadget, struct pxa2xx_udc, gadget);
1247
1248         /* not all boards support pullup control */
1249         if (!udc->mach->udc_command)
1250                 return -EOPNOTSUPP;
1251
1252         is_active = (is_active != 0);
1253         udc->pullup = is_active;
1254         pullup(udc, is_active);
1255         return 0;
1256 }
1257
1258 static const struct usb_gadget_ops pxa2xx_udc_ops = {
1259         .get_frame      = pxa2xx_udc_get_frame,
1260         .wakeup         = pxa2xx_udc_wakeup,
1261         .vbus_session   = pxa2xx_udc_vbus_session,
1262         .pullup         = pxa2xx_udc_pullup,
1263
1264         // .vbus_draw ... boards may consume current from VBUS, up to
1265         // 100-500mA based on config.  the 500uA suspend ceiling means
1266         // that exclusively vbus-powered PXA designs violate USB specs.
1267 };
1268
1269 /*-------------------------------------------------------------------------*/
1270
1271 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1272
1273 static const char proc_node_name [] = "driver/udc";
1274
1275 static int
1276 udc_proc_read(char *page, char **start, off_t off, int count,
1277                 int *eof, void *_dev)
1278 {
1279         char                    *buf = page;
1280         struct pxa2xx_udc       *dev = _dev;
1281         char                    *next = buf;
1282         unsigned                size = count;
1283         unsigned long           flags;
1284         int                     i, t;
1285         u32                     tmp;
1286
1287         if (off != 0)
1288                 return 0;
1289
1290         local_irq_save(flags);
1291
1292         /* basic device status */
1293         t = scnprintf(next, size, DRIVER_DESC "\n"
1294                 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
1295                 driver_name, DRIVER_VERSION SIZE_STR DMASTR,
1296                 dev->driver ? dev->driver->driver.name : "(none)",
1297                 is_vbus_present() ? "full speed" : "disconnected");
1298         size -= t;
1299         next += t;
1300
1301         /* registers for device and ep0 */
1302         t = scnprintf(next, size,
1303                 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
1304                 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
1305         size -= t;
1306         next += t;
1307
1308         tmp = UDCCR;
1309         t = scnprintf(next, size,
1310                 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
1311                 (tmp & UDCCR_REM) ? " rem" : "",
1312                 (tmp & UDCCR_RSTIR) ? " rstir" : "",
1313                 (tmp & UDCCR_SRM) ? " srm" : "",
1314                 (tmp & UDCCR_SUSIR) ? " susir" : "",
1315                 (tmp & UDCCR_RESIR) ? " resir" : "",
1316                 (tmp & UDCCR_RSM) ? " rsm" : "",
1317                 (tmp & UDCCR_UDA) ? " uda" : "",
1318                 (tmp & UDCCR_UDE) ? " ude" : "");
1319         size -= t;
1320         next += t;
1321
1322         tmp = UDCCS0;
1323         t = scnprintf(next, size,
1324                 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
1325                 (tmp & UDCCS0_SA) ? " sa" : "",
1326                 (tmp & UDCCS0_RNE) ? " rne" : "",
1327                 (tmp & UDCCS0_FST) ? " fst" : "",
1328                 (tmp & UDCCS0_SST) ? " sst" : "",
1329                 (tmp & UDCCS0_DRWF) ? " dwrf" : "",
1330                 (tmp & UDCCS0_FTF) ? " ftf" : "",
1331                 (tmp & UDCCS0_IPR) ? " ipr" : "",
1332                 (tmp & UDCCS0_OPR) ? " opr" : "");
1333         size -= t;
1334         next += t;
1335
1336         if (dev->has_cfr) {
1337                 tmp = UDCCFR;
1338                 t = scnprintf(next, size,
1339                         "udccfr %02X =%s%s\n", tmp,
1340                         (tmp & UDCCFR_AREN) ? " aren" : "",
1341                         (tmp & UDCCFR_ACM) ? " acm" : "");
1342                 size -= t;
1343                 next += t;
1344         }
1345
1346         if (!is_vbus_present() || !dev->driver)
1347                 goto done;
1348
1349         t = scnprintf(next, size, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
1350                 dev->stats.write.bytes, dev->stats.write.ops,
1351                 dev->stats.read.bytes, dev->stats.read.ops,
1352                 dev->stats.irqs);
1353         size -= t;
1354         next += t;
1355
1356         /* dump endpoint queues */
1357         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1358                 struct pxa2xx_ep        *ep = &dev->ep [i];
1359                 struct pxa2xx_request   *req;
1360                 int                     t;
1361
1362                 if (i != 0) {
1363                         const struct usb_endpoint_descriptor    *d;
1364
1365                         d = ep->desc;
1366                         if (!d)
1367                                 continue;
1368                         tmp = *dev->ep [i].reg_udccs;
1369                         t = scnprintf(next, size,
1370                                 "%s max %d %s udccs %02x irqs %lu/%lu\n",
1371                                 ep->ep.name, le16_to_cpu (d->wMaxPacketSize),
1372                                 (ep->dma >= 0) ? "dma" : "pio", tmp,
1373                                 ep->pio_irqs, ep->dma_irqs);
1374                         /* TODO translate all five groups of udccs bits! */
1375
1376                 } else /* ep0 should only have one transfer queued */
1377                         t = scnprintf(next, size, "ep0 max 16 pio irqs %lu\n",
1378                                 ep->pio_irqs);
1379                 if (t <= 0 || t > size)
1380                         goto done;
1381                 size -= t;
1382                 next += t;
1383
1384                 if (list_empty(&ep->queue)) {
1385                         t = scnprintf(next, size, "\t(nothing queued)\n");
1386                         if (t <= 0 || t > size)
1387                                 goto done;
1388                         size -= t;
1389                         next += t;
1390                         continue;
1391                 }
1392                 list_for_each_entry(req, &ep->queue, queue) {
1393 #ifdef  USE_DMA
1394                         if (ep->dma >= 0 && req->queue.prev == &ep->queue)
1395                                 t = scnprintf(next, size,
1396                                         "\treq %p len %d/%d "
1397                                         "buf %p (dma%d dcmd %08x)\n",
1398                                         &req->req, req->req.actual,
1399                                         req->req.length, req->req.buf,
1400                                         ep->dma, DCMD(ep->dma)
1401                                         // low 13 bits == bytes-to-go
1402                                         );
1403                         else
1404 #endif
1405                                 t = scnprintf(next, size,
1406                                         "\treq %p len %d/%d buf %p\n",
1407                                         &req->req, req->req.actual,
1408                                         req->req.length, req->req.buf);
1409                         if (t <= 0 || t > size)
1410                                 goto done;
1411                         size -= t;
1412                         next += t;
1413                 }
1414         }
1415
1416 done:
1417         local_irq_restore(flags);
1418         *eof = 1;
1419         return count - size;
1420 }
1421
1422 #define create_proc_files() \
1423         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev)
1424 #define remove_proc_files() \
1425         remove_proc_entry(proc_node_name, NULL)
1426
1427 #else   /* !CONFIG_USB_GADGET_DEBUG_FILES */
1428
1429 #define create_proc_files() do {} while (0)
1430 #define remove_proc_files() do {} while (0)
1431
1432 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1433
1434 /* "function" sysfs attribute */
1435 static ssize_t
1436 show_function (struct device *_dev, struct device_attribute *attr, char *buf)
1437 {
1438         struct pxa2xx_udc       *dev = dev_get_drvdata (_dev);
1439
1440         if (!dev->driver
1441                         || !dev->driver->function
1442                         || strlen (dev->driver->function) > PAGE_SIZE)
1443                 return 0;
1444         return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1445 }
1446 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
1447
1448 /*-------------------------------------------------------------------------*/
1449
1450 /*
1451  *      udc_disable - disable USB device controller
1452  */
1453 static void udc_disable(struct pxa2xx_udc *dev)
1454 {
1455         /* block all irqs */
1456         udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1457         UICR0 = UICR1 = 0xff;
1458         UFNRH = UFNRH_SIM;
1459
1460         /* if hardware supports it, disconnect from usb */
1461         pullup_off();
1462
1463         udc_clear_mask_UDCCR(UDCCR_UDE);
1464
1465 #ifdef  CONFIG_ARCH_PXA
1466         /* Disable clock for USB device */
1467         pxa_set_cken(CKEN11_USB, 0);
1468 #endif
1469
1470         ep0_idle (dev);
1471         dev->gadget.speed = USB_SPEED_UNKNOWN;
1472         LED_CONNECTED_OFF;
1473 }
1474
1475
1476 /*
1477  *      udc_reinit - initialize software state
1478  */
1479 static void udc_reinit(struct pxa2xx_udc *dev)
1480 {
1481         u32     i;
1482
1483         /* device/ep0 records init */
1484         INIT_LIST_HEAD (&dev->gadget.ep_list);
1485         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1486         dev->ep0state = EP0_IDLE;
1487
1488         /* basic endpoint records init */
1489         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1490                 struct pxa2xx_ep *ep = &dev->ep[i];
1491
1492                 if (i != 0)
1493                         list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1494
1495                 ep->desc = NULL;
1496                 ep->stopped = 0;
1497                 INIT_LIST_HEAD (&ep->queue);
1498                 ep->pio_irqs = ep->dma_irqs = 0;
1499         }
1500
1501         /* the rest was statically initialized, and is read-only */
1502 }
1503
1504 /* until it's enabled, this UDC should be completely invisible
1505  * to any USB host.
1506  */
1507 static void udc_enable (struct pxa2xx_udc *dev)
1508 {
1509         udc_clear_mask_UDCCR(UDCCR_UDE);
1510
1511 #ifdef  CONFIG_ARCH_PXA
1512         /* Enable clock for USB device */
1513         pxa_set_cken(CKEN11_USB, 1);
1514         udelay(5);
1515 #endif
1516
1517         /* try to clear these bits before we enable the udc */
1518         udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
1519
1520         ep0_idle(dev);
1521         dev->gadget.speed = USB_SPEED_UNKNOWN;
1522         dev->stats.irqs = 0;
1523
1524         /*
1525          * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1526          * - enable UDC
1527          * - if RESET is already in progress, ack interrupt
1528          * - unmask reset interrupt
1529          */
1530         udc_set_mask_UDCCR(UDCCR_UDE);
1531         if (!(UDCCR & UDCCR_UDA))
1532                 udc_ack_int_UDCCR(UDCCR_RSTIR);
1533
1534         if (dev->has_cfr /* UDC_RES2 is defined */) {
1535                 /* pxa255 (a0+) can avoid a set_config race that could
1536                  * prevent gadget drivers from configuring correctly
1537                  */
1538                 UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
1539         } else {
1540                 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
1541                  * which could result in missing packets and interrupts.
1542                  * supposedly one bit per endpoint, controlling whether it
1543                  * double buffers or not; ACM/AREN bits fit into the holes.
1544                  * zero bits (like USIR0_IRx) disable double buffering.
1545                  */
1546                 UDC_RES1 = 0x00;
1547                 UDC_RES2 = 0x00;
1548         }
1549
1550 #ifdef  DISABLE_TEST_MODE
1551         /* "test mode" seems to have become the default in later chip
1552          * revs, preventing double buffering (and invalidating docs).
1553          * this EXPERIMENT enables it for bulk endpoints by tweaking
1554          * undefined/reserved register bits (that other drivers clear).
1555          * Belcarra code comments noted this usage.
1556          */
1557         if (fifo_mode & 1) {    /* IN endpoints */
1558                 UDC_RES1 |= USIR0_IR1|USIR0_IR6;
1559                 UDC_RES2 |= USIR1_IR11;
1560         }
1561         if (fifo_mode & 2) {    /* OUT endpoints */
1562                 UDC_RES1 |= USIR0_IR2|USIR0_IR7;
1563                 UDC_RES2 |= USIR1_IR12;
1564         }
1565 #endif
1566
1567         /* enable suspend/resume and reset irqs */
1568         udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1569
1570         /* enable ep0 irqs */
1571         UICR0 &= ~UICR0_IM0;
1572
1573         /* if hardware supports it, pullup D+ and wait for reset */
1574         pullup_on();
1575 }
1576
1577
1578 /* when a driver is successfully registered, it will receive
1579  * control requests including set_configuration(), which enables
1580  * non-control requests.  then usb traffic follows until a
1581  * disconnect is reported.  then a host may connect again, or
1582  * the driver might get unbound.
1583  */
1584 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1585 {
1586         struct pxa2xx_udc       *dev = the_controller;
1587         int                     retval;
1588
1589         if (!driver
1590                         || driver->speed != USB_SPEED_FULL
1591                         || !driver->bind
1592                         || !driver->unbind
1593                         || !driver->disconnect
1594                         || !driver->setup)
1595                 return -EINVAL;
1596         if (!dev)
1597                 return -ENODEV;
1598         if (dev->driver)
1599                 return -EBUSY;
1600
1601         /* first hook up the driver ... */
1602         dev->driver = driver;
1603         dev->gadget.dev.driver = &driver->driver;
1604         dev->pullup = 1;
1605
1606         device_add (&dev->gadget.dev);
1607         retval = driver->bind(&dev->gadget);
1608         if (retval) {
1609                 DMSG("bind to driver %s --> error %d\n",
1610                                 driver->driver.name, retval);
1611                 device_del (&dev->gadget.dev);
1612
1613                 dev->driver = NULL;
1614                 dev->gadget.dev.driver = NULL;
1615                 return retval;
1616         }
1617         device_create_file(dev->dev, &dev_attr_function);
1618
1619         /* ... then enable host detection and ep0; and we're ready
1620          * for set_configuration as well as eventual disconnect.
1621          */
1622         DMSG("registered gadget driver '%s'\n", driver->driver.name);
1623         pullup(dev, 1);
1624         dump_state(dev);
1625         return 0;
1626 }
1627 EXPORT_SYMBOL(usb_gadget_register_driver);
1628
1629 static void
1630 stop_activity(struct pxa2xx_udc *dev, struct usb_gadget_driver *driver)
1631 {
1632         int i;
1633
1634         /* don't disconnect drivers more than once */
1635         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1636                 driver = NULL;
1637         dev->gadget.speed = USB_SPEED_UNKNOWN;
1638
1639         /* prevent new request submissions, kill any outstanding requests  */
1640         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1641                 struct pxa2xx_ep *ep = &dev->ep[i];
1642
1643                 ep->stopped = 1;
1644                 nuke(ep, -ESHUTDOWN);
1645         }
1646         del_timer_sync(&dev->timer);
1647
1648         /* report disconnect; the driver is already quiesced */
1649         LED_CONNECTED_OFF;
1650         if (driver)
1651                 driver->disconnect(&dev->gadget);
1652
1653         /* re-init driver-visible data structures */
1654         udc_reinit(dev);
1655 }
1656
1657 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1658 {
1659         struct pxa2xx_udc       *dev = the_controller;
1660
1661         if (!dev)
1662                 return -ENODEV;
1663         if (!driver || driver != dev->driver)
1664                 return -EINVAL;
1665
1666         local_irq_disable();
1667         pullup(dev, 0);
1668         stop_activity(dev, driver);
1669         local_irq_enable();
1670
1671         driver->unbind(&dev->gadget);
1672         dev->driver = NULL;
1673
1674         device_del (&dev->gadget.dev);
1675         device_remove_file(dev->dev, &dev_attr_function);
1676
1677         DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
1678         dump_state(dev);
1679         return 0;
1680 }
1681 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1682
1683
1684 /*-------------------------------------------------------------------------*/
1685
1686 #ifdef CONFIG_ARCH_LUBBOCK
1687
1688 /* Lubbock has separate connect and disconnect irqs.  More typical designs
1689  * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
1690  */
1691
1692 static irqreturn_t
1693 lubbock_vbus_irq(int irq, void *_dev, struct pt_regs *r)
1694 {
1695         struct pxa2xx_udc       *dev = _dev;
1696         int                     vbus;
1697
1698         dev->stats.irqs++;
1699         HEX_DISPLAY(dev->stats.irqs);
1700         switch (irq) {
1701         case LUBBOCK_USB_IRQ:
1702                 LED_CONNECTED_ON;
1703                 vbus = 1;
1704                 disable_irq(LUBBOCK_USB_IRQ);
1705                 enable_irq(LUBBOCK_USB_DISC_IRQ);
1706                 break;
1707         case LUBBOCK_USB_DISC_IRQ:
1708                 LED_CONNECTED_OFF;
1709                 vbus = 0;
1710                 disable_irq(LUBBOCK_USB_DISC_IRQ);
1711                 enable_irq(LUBBOCK_USB_IRQ);
1712                 break;
1713         default:
1714                 return IRQ_NONE;
1715         }
1716
1717         pxa2xx_udc_vbus_session(&dev->gadget, vbus);
1718         return IRQ_HANDLED;
1719 }
1720
1721 #endif
1722
1723
1724 /*-------------------------------------------------------------------------*/
1725
1726 static inline void clear_ep_state (struct pxa2xx_udc *dev)
1727 {
1728         unsigned i;
1729
1730         /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1731          * fifos, and pending transactions mustn't be continued in any case.
1732          */
1733         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1734                 nuke(&dev->ep[i], -ECONNABORTED);
1735 }
1736
1737 static void udc_watchdog(unsigned long _dev)
1738 {
1739         struct pxa2xx_udc       *dev = (void *)_dev;
1740
1741         local_irq_disable();
1742         if (dev->ep0state == EP0_STALL
1743                         && (UDCCS0 & UDCCS0_FST) == 0
1744                         && (UDCCS0 & UDCCS0_SST) == 0) {
1745                 UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
1746                 DBG(DBG_VERBOSE, "ep0 re-stall\n");
1747                 start_watchdog(dev);
1748         }
1749         local_irq_enable();
1750 }
1751
1752 static void handle_ep0 (struct pxa2xx_udc *dev)
1753 {
1754         u32                     udccs0 = UDCCS0;
1755         struct pxa2xx_ep        *ep = &dev->ep [0];
1756         struct pxa2xx_request   *req;
1757         union {
1758                 struct usb_ctrlrequest  r;
1759                 u8                      raw [8];
1760                 u32                     word [2];
1761         } u;
1762
1763         if (list_empty(&ep->queue))
1764                 req = NULL;
1765         else
1766                 req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
1767
1768         /* clear stall status */
1769         if (udccs0 & UDCCS0_SST) {
1770                 nuke(ep, -EPIPE);
1771                 UDCCS0 = UDCCS0_SST;
1772                 del_timer(&dev->timer);
1773                 ep0_idle(dev);
1774         }
1775
1776         /* previous request unfinished?  non-error iff back-to-back ... */
1777         if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1778                 nuke(ep, 0);
1779                 del_timer(&dev->timer);
1780                 ep0_idle(dev);
1781         }
1782
1783         switch (dev->ep0state) {
1784         case EP0_IDLE:
1785                 /* late-breaking status? */
1786                 udccs0 = UDCCS0;
1787
1788                 /* start control request? */
1789                 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1790                                 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1791                         int i;
1792
1793                         nuke (ep, -EPROTO);
1794
1795                         /* read SETUP packet */
1796                         for (i = 0; i < 8; i++) {
1797                                 if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
1798 bad_setup:
1799                                         DMSG("SETUP %d!\n", i);
1800                                         goto stall;
1801                                 }
1802                                 u.raw [i] = (u8) UDDR0;
1803                         }
1804                         if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
1805                                 goto bad_setup;
1806
1807 got_setup:
1808                         DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1809                                 u.r.bRequestType, u.r.bRequest,
1810                                 le16_to_cpu(u.r.wValue),
1811                                 le16_to_cpu(u.r.wIndex),
1812                                 le16_to_cpu(u.r.wLength));
1813
1814                         /* cope with automagic for some standard requests. */
1815                         dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1816                                                 == USB_TYPE_STANDARD;
1817                         dev->req_config = 0;
1818                         dev->req_pending = 1;
1819                         switch (u.r.bRequest) {
1820                         /* hardware restricts gadget drivers here! */
1821                         case USB_REQ_SET_CONFIGURATION:
1822                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1823                                         /* reflect hardware's automagic
1824                                          * up to the gadget driver.
1825                                          */
1826 config_change:
1827                                         dev->req_config = 1;
1828                                         clear_ep_state(dev);
1829                                         /* if !has_cfr, there's no synch
1830                                          * else use AREN (later) not SA|OPR
1831                                          * USIR0_IR0 acts edge sensitive
1832                                          */
1833                                 }
1834                                 break;
1835                         /* ... and here, even more ... */
1836                         case USB_REQ_SET_INTERFACE:
1837                                 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1838                                         /* udc hardware is broken by design:
1839                                          *  - altsetting may only be zero;
1840                                          *  - hw resets all interfaces' eps;
1841                                          *  - ep reset doesn't include halt(?).
1842                                          */
1843                                         DMSG("broken set_interface (%d/%d)\n",
1844                                                 le16_to_cpu(u.r.wIndex),
1845                                                 le16_to_cpu(u.r.wValue));
1846                                         goto config_change;
1847                                 }
1848                                 break;
1849                         /* hardware was supposed to hide this */
1850                         case USB_REQ_SET_ADDRESS:
1851                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1852                                         ep0start(dev, 0, "address");
1853                                         return;
1854                                 }
1855                                 break;
1856                         }
1857
1858                         if (u.r.bRequestType & USB_DIR_IN)
1859                                 dev->ep0state = EP0_IN_DATA_PHASE;
1860                         else
1861                                 dev->ep0state = EP0_OUT_DATA_PHASE;
1862
1863                         i = dev->driver->setup(&dev->gadget, &u.r);
1864                         if (i < 0) {
1865                                 /* hardware automagic preventing STALL... */
1866                                 if (dev->req_config) {
1867                                         /* hardware sometimes neglects to tell
1868                                          * tell us about config change events,
1869                                          * so later ones may fail...
1870                                          */
1871                                         WARN("config change %02x fail %d?\n",
1872                                                 u.r.bRequest, i);
1873                                         return;
1874                                         /* TODO experiment:  if has_cfr,
1875                                          * hardware didn't ACK; maybe we
1876                                          * could actually STALL!
1877                                          */
1878                                 }
1879                                 DBG(DBG_VERBOSE, "protocol STALL, "
1880                                         "%02x err %d\n", UDCCS0, i);
1881 stall:
1882                                 /* the watchdog timer helps deal with cases
1883                                  * where udc seems to clear FST wrongly, and
1884                                  * then NAKs instead of STALLing.
1885                                  */
1886                                 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1887                                 start_watchdog(dev);
1888                                 dev->ep0state = EP0_STALL;
1889
1890                         /* deferred i/o == no response yet */
1891                         } else if (dev->req_pending) {
1892                                 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1893                                                 || dev->req_std || u.r.wLength))
1894                                         ep0start(dev, 0, "defer");
1895                                 else
1896                                         ep0start(dev, UDCCS0_IPR, "defer/IPR");
1897                         }
1898
1899                         /* expect at least one data or status stage irq */
1900                         return;
1901
1902                 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1903                                 == (UDCCS0_OPR|UDCCS0_SA))) {
1904                         unsigned i;
1905
1906                         /* pxa210/250 erratum 131 for B0/B1 says RNE lies.
1907                          * still observed on a pxa255 a0.
1908                          */
1909                         DBG(DBG_VERBOSE, "e131\n");
1910                         nuke(ep, -EPROTO);
1911
1912                         /* read SETUP data, but don't trust it too much */
1913                         for (i = 0; i < 8; i++)
1914                                 u.raw [i] = (u8) UDDR0;
1915                         if ((u.r.bRequestType & USB_RECIP_MASK)
1916                                         > USB_RECIP_OTHER)
1917                                 goto stall;
1918                         if (u.word [0] == 0 && u.word [1] == 0)
1919                                 goto stall;
1920                         goto got_setup;
1921                 } else {
1922                         /* some random early IRQ:
1923                          * - we acked FST
1924                          * - IPR cleared
1925                          * - OPR got set, without SA (likely status stage)
1926                          */
1927                         UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
1928                 }
1929                 break;
1930         case EP0_IN_DATA_PHASE:                 /* GET_DESCRIPTOR etc */
1931                 if (udccs0 & UDCCS0_OPR) {
1932                         UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
1933                         DBG(DBG_VERBOSE, "ep0in premature status\n");
1934                         if (req)
1935                                 done(ep, req, 0);
1936                         ep0_idle(dev);
1937                 } else /* irq was IPR clearing */ {
1938                         if (req) {
1939                                 /* this IN packet might finish the request */
1940                                 (void) write_ep0_fifo(ep, req);
1941                         } /* else IN token before response was written */
1942                 }
1943                 break;
1944         case EP0_OUT_DATA_PHASE:                /* SET_DESCRIPTOR etc */
1945                 if (udccs0 & UDCCS0_OPR) {
1946                         if (req) {
1947                                 /* this OUT packet might finish the request */
1948                                 if (read_ep0_fifo(ep, req))
1949                                         done(ep, req, 0);
1950                                 /* else more OUT packets expected */
1951                         } /* else OUT token before read was issued */
1952                 } else /* irq was IPR clearing */ {
1953                         DBG(DBG_VERBOSE, "ep0out premature status\n");
1954                         if (req)
1955                                 done(ep, req, 0);
1956                         ep0_idle(dev);
1957                 }
1958                 break;
1959         case EP0_END_XFER:
1960                 if (req)
1961                         done(ep, req, 0);
1962                 /* ack control-IN status (maybe in-zlp was skipped)
1963                  * also appears after some config change events.
1964                  */
1965                 if (udccs0 & UDCCS0_OPR)
1966                         UDCCS0 = UDCCS0_OPR;
1967                 ep0_idle(dev);
1968                 break;
1969         case EP0_STALL:
1970                 UDCCS0 = UDCCS0_FST;
1971                 break;
1972         }
1973         USIR0 = USIR0_IR0;
1974 }
1975
1976 static void handle_ep(struct pxa2xx_ep *ep)
1977 {
1978         struct pxa2xx_request   *req;
1979         int                     is_in = ep->bEndpointAddress & USB_DIR_IN;
1980         int                     completed;
1981         u32                     udccs, tmp;
1982
1983         do {
1984                 completed = 0;
1985                 if (likely (!list_empty(&ep->queue)))
1986                         req = list_entry(ep->queue.next,
1987                                         struct pxa2xx_request, queue);
1988                 else
1989                         req = NULL;
1990
1991                 // TODO check FST handling
1992
1993                 udccs = *ep->reg_udccs;
1994                 if (unlikely(is_in)) {  /* irq from TPC, SST, or (ISO) TUR */
1995                         tmp = UDCCS_BI_TUR;
1996                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1997                                 tmp |= UDCCS_BI_SST;
1998                         tmp &= udccs;
1999                         if (likely (tmp))
2000                                 *ep->reg_udccs = tmp;
2001                         if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
2002                                 completed = write_fifo(ep, req);
2003
2004                 } else {        /* irq from RPC (or for ISO, ROF) */
2005                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
2006                                 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
2007                         else
2008                                 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
2009                         tmp &= udccs;
2010                         if (likely(tmp))
2011                                 *ep->reg_udccs = tmp;
2012
2013                         /* fifos can hold packets, ready for reading... */
2014                         if (likely(req)) {
2015 #ifdef USE_OUT_DMA
2016 // TODO didn't yet debug out-dma.  this approach assumes
2017 // the worst about short packets and RPC; it might be better.
2018
2019                                 if (likely(ep->dma >= 0)) {
2020                                         if (!(udccs & UDCCS_BO_RSP)) {
2021                                                 *ep->reg_udccs = UDCCS_BO_RPC;
2022                                                 ep->dma_irqs++;
2023                                                 return;
2024                                         }
2025                                 }
2026 #endif
2027                                 completed = read_fifo(ep, req);
2028                         } else
2029                                 pio_irq_disable (ep->bEndpointAddress);
2030                 }
2031                 ep->pio_irqs++;
2032         } while (completed);
2033 }
2034
2035 /*
2036  *      pxa2xx_udc_irq - interrupt handler
2037  *
2038  * avoid delays in ep0 processing. the control handshaking isn't always
2039  * under software control (pxa250c0 and the pxa255 are better), and delays
2040  * could cause usb protocol errors.
2041  */
2042 static irqreturn_t
2043 pxa2xx_udc_irq(int irq, void *_dev, struct pt_regs *r)
2044 {
2045         struct pxa2xx_udc       *dev = _dev;
2046         int                     handled;
2047
2048         dev->stats.irqs++;
2049         HEX_DISPLAY(dev->stats.irqs);
2050         do {
2051                 u32             udccr = UDCCR;
2052
2053                 handled = 0;
2054
2055                 /* SUSpend Interrupt Request */
2056                 if (unlikely(udccr & UDCCR_SUSIR)) {
2057                         udc_ack_int_UDCCR(UDCCR_SUSIR);
2058                         handled = 1;
2059                         DBG(DBG_VERBOSE, "USB suspend%s\n", is_vbus_present()
2060                                 ? "" : "+disconnect");
2061
2062                         if (!is_vbus_present())
2063                                 stop_activity(dev, dev->driver);
2064                         else if (dev->gadget.speed != USB_SPEED_UNKNOWN
2065                                         && dev->driver
2066                                         && dev->driver->suspend)
2067                                 dev->driver->suspend(&dev->gadget);
2068                         ep0_idle (dev);
2069                 }
2070
2071                 /* RESume Interrupt Request */
2072                 if (unlikely(udccr & UDCCR_RESIR)) {
2073                         udc_ack_int_UDCCR(UDCCR_RESIR);
2074                         handled = 1;
2075                         DBG(DBG_VERBOSE, "USB resume\n");
2076
2077                         if (dev->gadget.speed != USB_SPEED_UNKNOWN
2078                                         && dev->driver
2079                                         && dev->driver->resume
2080                                         && is_vbus_present())
2081                                 dev->driver->resume(&dev->gadget);
2082                 }
2083
2084                 /* ReSeT Interrupt Request - USB reset */
2085                 if (unlikely(udccr & UDCCR_RSTIR)) {
2086                         udc_ack_int_UDCCR(UDCCR_RSTIR);
2087                         handled = 1;
2088
2089                         if ((UDCCR & UDCCR_UDA) == 0) {
2090                                 DBG(DBG_VERBOSE, "USB reset start\n");
2091
2092                                 /* reset driver and endpoints,
2093                                  * in case that's not yet done
2094                                  */
2095                                 stop_activity (dev, dev->driver);
2096
2097                         } else {
2098                                 DBG(DBG_VERBOSE, "USB reset end\n");
2099                                 dev->gadget.speed = USB_SPEED_FULL;
2100                                 LED_CONNECTED_ON;
2101                                 memset(&dev->stats, 0, sizeof dev->stats);
2102                                 /* driver and endpoints are still reset */
2103                         }
2104
2105                 } else {
2106                         u32     usir0 = USIR0 & ~UICR0;
2107                         u32     usir1 = USIR1 & ~UICR1;
2108                         int     i;
2109
2110                         if (unlikely (!usir0 && !usir1))
2111                                 continue;
2112
2113                         DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);
2114
2115                         /* control traffic */
2116                         if (usir0 & USIR0_IR0) {
2117                                 dev->ep[0].pio_irqs++;
2118                                 handle_ep0(dev);
2119                                 handled = 1;
2120                         }
2121
2122                         /* endpoint data transfers */
2123                         for (i = 0; i < 8; i++) {
2124                                 u32     tmp = 1 << i;
2125
2126                                 if (i && (usir0 & tmp)) {
2127                                         handle_ep(&dev->ep[i]);
2128                                         USIR0 |= tmp;
2129                                         handled = 1;
2130                                 }
2131                                 if (usir1 & tmp) {
2132                                         handle_ep(&dev->ep[i+8]);
2133                                         USIR1 |= tmp;
2134                                         handled = 1;
2135                                 }
2136                         }
2137                 }
2138
2139                 /* we could also ask for 1 msec SOF (SIR) interrupts */
2140
2141         } while (handled);
2142         return IRQ_HANDLED;
2143 }
2144
2145 /*-------------------------------------------------------------------------*/
2146
2147 static void nop_release (struct device *dev)
2148 {
2149         DMSG("%s %s\n", __FUNCTION__, dev->bus_id);
2150 }
2151
2152 /* this uses load-time allocation and initialization (instead of
2153  * doing it at run-time) to save code, eliminate fault paths, and
2154  * be more obviously correct.
2155  */
2156 static struct pxa2xx_udc memory = {
2157         .gadget = {
2158                 .ops            = &pxa2xx_udc_ops,
2159                 .ep0            = &memory.ep[0].ep,
2160                 .name           = driver_name,
2161                 .dev = {
2162                         .bus_id         = "gadget",
2163                         .release        = nop_release,
2164                 },
2165         },
2166
2167         /* control endpoint */
2168         .ep[0] = {
2169                 .ep = {
2170                         .name           = ep0name,
2171                         .ops            = &pxa2xx_ep_ops,
2172                         .maxpacket      = EP0_FIFO_SIZE,
2173                 },
2174                 .dev            = &memory,
2175                 .reg_udccs      = &UDCCS0,
2176                 .reg_uddr       = &UDDR0,
2177         },
2178
2179         /* first group of endpoints */
2180         .ep[1] = {
2181                 .ep = {
2182                         .name           = "ep1in-bulk",
2183                         .ops            = &pxa2xx_ep_ops,
2184                         .maxpacket      = BULK_FIFO_SIZE,
2185                 },
2186                 .dev            = &memory,
2187                 .fifo_size      = BULK_FIFO_SIZE,
2188                 .bEndpointAddress = USB_DIR_IN | 1,
2189                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2190                 .reg_udccs      = &UDCCS1,
2191                 .reg_uddr       = &UDDR1,
2192                 drcmr (25)
2193         },
2194         .ep[2] = {
2195                 .ep = {
2196                         .name           = "ep2out-bulk",
2197                         .ops            = &pxa2xx_ep_ops,
2198                         .maxpacket      = BULK_FIFO_SIZE,
2199                 },
2200                 .dev            = &memory,
2201                 .fifo_size      = BULK_FIFO_SIZE,
2202                 .bEndpointAddress = 2,
2203                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2204                 .reg_udccs      = &UDCCS2,
2205                 .reg_ubcr       = &UBCR2,
2206                 .reg_uddr       = &UDDR2,
2207                 drcmr (26)
2208         },
2209 #ifndef CONFIG_USB_PXA2XX_SMALL
2210         .ep[3] = {
2211                 .ep = {
2212                         .name           = "ep3in-iso",
2213                         .ops            = &pxa2xx_ep_ops,
2214                         .maxpacket      = ISO_FIFO_SIZE,
2215                 },
2216                 .dev            = &memory,
2217                 .fifo_size      = ISO_FIFO_SIZE,
2218                 .bEndpointAddress = USB_DIR_IN | 3,
2219                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2220                 .reg_udccs      = &UDCCS3,
2221                 .reg_uddr       = &UDDR3,
2222                 drcmr (27)
2223         },
2224         .ep[4] = {
2225                 .ep = {
2226                         .name           = "ep4out-iso",
2227                         .ops            = &pxa2xx_ep_ops,
2228                         .maxpacket      = ISO_FIFO_SIZE,
2229                 },
2230                 .dev            = &memory,
2231                 .fifo_size      = ISO_FIFO_SIZE,
2232                 .bEndpointAddress = 4,
2233                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2234                 .reg_udccs      = &UDCCS4,
2235                 .reg_ubcr       = &UBCR4,
2236                 .reg_uddr       = &UDDR4,
2237                 drcmr (28)
2238         },
2239         .ep[5] = {
2240                 .ep = {
2241                         .name           = "ep5in-int",
2242                         .ops            = &pxa2xx_ep_ops,
2243                         .maxpacket      = INT_FIFO_SIZE,
2244                 },
2245                 .dev            = &memory,
2246                 .fifo_size      = INT_FIFO_SIZE,
2247                 .bEndpointAddress = USB_DIR_IN | 5,
2248                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2249                 .reg_udccs      = &UDCCS5,
2250                 .reg_uddr       = &UDDR5,
2251         },
2252
2253         /* second group of endpoints */
2254         .ep[6] = {
2255                 .ep = {
2256                         .name           = "ep6in-bulk",
2257                         .ops            = &pxa2xx_ep_ops,
2258                         .maxpacket      = BULK_FIFO_SIZE,
2259                 },
2260                 .dev            = &memory,
2261                 .fifo_size      = BULK_FIFO_SIZE,
2262                 .bEndpointAddress = USB_DIR_IN | 6,
2263                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2264                 .reg_udccs      = &UDCCS6,
2265                 .reg_uddr       = &UDDR6,
2266                 drcmr (30)
2267         },
2268         .ep[7] = {
2269                 .ep = {
2270                         .name           = "ep7out-bulk",
2271                         .ops            = &pxa2xx_ep_ops,
2272                         .maxpacket      = BULK_FIFO_SIZE,
2273                 },
2274                 .dev            = &memory,
2275                 .fifo_size      = BULK_FIFO_SIZE,
2276                 .bEndpointAddress = 7,
2277                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2278                 .reg_udccs      = &UDCCS7,
2279                 .reg_ubcr       = &UBCR7,
2280                 .reg_uddr       = &UDDR7,
2281                 drcmr (31)
2282         },
2283         .ep[8] = {
2284                 .ep = {
2285                         .name           = "ep8in-iso",
2286                         .ops            = &pxa2xx_ep_ops,
2287                         .maxpacket      = ISO_FIFO_SIZE,
2288                 },
2289                 .dev            = &memory,
2290                 .fifo_size      = ISO_FIFO_SIZE,
2291                 .bEndpointAddress = USB_DIR_IN | 8,
2292                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2293                 .reg_udccs      = &UDCCS8,
2294                 .reg_uddr       = &UDDR8,
2295                 drcmr (32)
2296         },
2297         .ep[9] = {
2298                 .ep = {
2299                         .name           = "ep9out-iso",
2300                         .ops            = &pxa2xx_ep_ops,
2301                         .maxpacket      = ISO_FIFO_SIZE,
2302                 },
2303                 .dev            = &memory,
2304                 .fifo_size      = ISO_FIFO_SIZE,
2305                 .bEndpointAddress = 9,
2306                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2307                 .reg_udccs      = &UDCCS9,
2308                 .reg_ubcr       = &UBCR9,
2309                 .reg_uddr       = &UDDR9,
2310                 drcmr (33)
2311         },
2312         .ep[10] = {
2313                 .ep = {
2314                         .name           = "ep10in-int",
2315                         .ops            = &pxa2xx_ep_ops,
2316                         .maxpacket      = INT_FIFO_SIZE,
2317                 },
2318                 .dev            = &memory,
2319                 .fifo_size      = INT_FIFO_SIZE,
2320                 .bEndpointAddress = USB_DIR_IN | 10,
2321                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2322                 .reg_udccs      = &UDCCS10,
2323                 .reg_uddr       = &UDDR10,
2324         },
2325
2326         /* third group of endpoints */
2327         .ep[11] = {
2328                 .ep = {
2329                         .name           = "ep11in-bulk",
2330                         .ops            = &pxa2xx_ep_ops,
2331                         .maxpacket      = BULK_FIFO_SIZE,
2332                 },
2333                 .dev            = &memory,
2334                 .fifo_size      = BULK_FIFO_SIZE,
2335                 .bEndpointAddress = USB_DIR_IN | 11,
2336                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2337                 .reg_udccs      = &UDCCS11,
2338                 .reg_uddr       = &UDDR11,
2339                 drcmr (35)
2340         },
2341         .ep[12] = {
2342                 .ep = {
2343                         .name           = "ep12out-bulk",
2344                         .ops            = &pxa2xx_ep_ops,
2345                         .maxpacket      = BULK_FIFO_SIZE,
2346                 },
2347                 .dev            = &memory,
2348                 .fifo_size      = BULK_FIFO_SIZE,
2349                 .bEndpointAddress = 12,
2350                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2351                 .reg_udccs      = &UDCCS12,
2352                 .reg_ubcr       = &UBCR12,
2353                 .reg_uddr       = &UDDR12,
2354                 drcmr (36)
2355         },
2356         .ep[13] = {
2357                 .ep = {
2358                         .name           = "ep13in-iso",
2359                         .ops            = &pxa2xx_ep_ops,
2360                         .maxpacket      = ISO_FIFO_SIZE,
2361                 },
2362                 .dev            = &memory,
2363                 .fifo_size      = ISO_FIFO_SIZE,
2364                 .bEndpointAddress = USB_DIR_IN | 13,
2365                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2366                 .reg_udccs      = &UDCCS13,
2367                 .reg_uddr       = &UDDR13,
2368                 drcmr (37)
2369         },
2370         .ep[14] = {
2371                 .ep = {
2372                         .name           = "ep14out-iso",
2373                         .ops            = &pxa2xx_ep_ops,
2374                         .maxpacket      = ISO_FIFO_SIZE,
2375                 },
2376                 .dev            = &memory,
2377                 .fifo_size      = ISO_FIFO_SIZE,
2378                 .bEndpointAddress = 14,
2379                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2380                 .reg_udccs      = &UDCCS14,
2381                 .reg_ubcr       = &UBCR14,
2382                 .reg_uddr       = &UDDR14,
2383                 drcmr (38)
2384         },
2385         .ep[15] = {
2386                 .ep = {
2387                         .name           = "ep15in-int",
2388                         .ops            = &pxa2xx_ep_ops,
2389                         .maxpacket      = INT_FIFO_SIZE,
2390                 },
2391                 .dev            = &memory,
2392                 .fifo_size      = INT_FIFO_SIZE,
2393                 .bEndpointAddress = USB_DIR_IN | 15,
2394                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2395                 .reg_udccs      = &UDCCS15,
2396                 .reg_uddr       = &UDDR15,
2397         },
2398 #endif /* !CONFIG_USB_PXA2XX_SMALL */
2399 };
2400
2401 #define CP15R0_VENDOR_MASK      0xffffe000
2402
2403 #if     defined(CONFIG_ARCH_PXA)
2404 #define CP15R0_XSCALE_VALUE     0x69052000      /* intel/arm/xscale */
2405
2406 #elif   defined(CONFIG_ARCH_IXP4XX)
2407 #define CP15R0_XSCALE_VALUE     0x69054000      /* intel/arm/ixp4xx */
2408
2409 #endif
2410
2411 #define CP15R0_PROD_MASK        0x000003f0
2412 #define PXA25x                  0x00000100      /* and PXA26x */
2413 #define PXA210                  0x00000120
2414
2415 #define CP15R0_REV_MASK         0x0000000f
2416
2417 #define CP15R0_PRODREV_MASK     (CP15R0_PROD_MASK | CP15R0_REV_MASK)
2418
2419 #define PXA255_A0               0x00000106      /* or PXA260_B1 */
2420 #define PXA250_C0               0x00000105      /* or PXA26x_B0 */
2421 #define PXA250_B2               0x00000104
2422 #define PXA250_B1               0x00000103      /* or PXA260_A0 */
2423 #define PXA250_B0               0x00000102
2424 #define PXA250_A1               0x00000101
2425 #define PXA250_A0               0x00000100
2426
2427 #define PXA210_C0               0x00000125
2428 #define PXA210_B2               0x00000124
2429 #define PXA210_B1               0x00000123
2430 #define PXA210_B0               0x00000122
2431 #define IXP425_A0               0x000001c1
2432
2433 /*
2434  *      probe - binds to the platform device
2435  */
2436 static int __init pxa2xx_udc_probe(struct device *_dev)
2437 {
2438         struct pxa2xx_udc *dev = &memory;
2439         int retval, out_dma = 1;
2440         u32 chiprev;
2441
2442         /* insist on Intel/ARM/XScale */
2443         asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
2444         if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
2445                 printk(KERN_ERR "%s: not XScale!\n", driver_name);
2446                 return -ENODEV;
2447         }
2448
2449         /* trigger chiprev-specific logic */
2450         switch (chiprev & CP15R0_PRODREV_MASK) {
2451 #if     defined(CONFIG_ARCH_PXA)
2452         case PXA255_A0:
2453                 dev->has_cfr = 1;
2454                 break;
2455         case PXA250_A0:
2456         case PXA250_A1:
2457                 /* A0/A1 "not released"; ep 13, 15 unusable */
2458                 /* fall through */
2459         case PXA250_B2: case PXA210_B2:
2460         case PXA250_B1: case PXA210_B1:
2461         case PXA250_B0: case PXA210_B0:
2462                 out_dma = 0;
2463                 /* fall through */
2464         case PXA250_C0: case PXA210_C0:
2465                 break;
2466 #elif   defined(CONFIG_ARCH_IXP4XX)
2467         case IXP425_A0:
2468                 out_dma = 0;
2469                 break;
2470 #endif
2471         default:
2472                 out_dma = 0;
2473                 printk(KERN_ERR "%s: unrecognized processor: %08x\n",
2474                         driver_name, chiprev);
2475                 /* iop3xx, ixp4xx, ... */
2476                 return -ENODEV;
2477         }
2478
2479         pr_debug("%s: IRQ %d%s%s%s\n", driver_name, IRQ_USB,
2480                 dev->has_cfr ? "" : " (!cfr)",
2481                 out_dma ? "" : " (broken dma-out)",
2482                 SIZE_STR DMASTR
2483                 );
2484
2485 #ifdef  USE_DMA
2486 #ifndef USE_OUT_DMA
2487         out_dma = 0;
2488 #endif
2489         /* pxa 250 erratum 130 prevents using OUT dma (fixed C0) */
2490         if (!out_dma) {
2491                 DMSG("disabled OUT dma\n");
2492                 dev->ep[ 2].reg_drcmr = dev->ep[ 4].reg_drcmr = 0;
2493                 dev->ep[ 7].reg_drcmr = dev->ep[ 9].reg_drcmr = 0;
2494                 dev->ep[12].reg_drcmr = dev->ep[14].reg_drcmr = 0;
2495         }
2496 #endif
2497
2498         /* other non-static parts of init */
2499         dev->dev = _dev;
2500         dev->mach = _dev->platform_data;
2501
2502         init_timer(&dev->timer);
2503         dev->timer.function = udc_watchdog;
2504         dev->timer.data = (unsigned long) dev;
2505
2506         device_initialize(&dev->gadget.dev);
2507         dev->gadget.dev.parent = _dev;
2508         dev->gadget.dev.dma_mask = _dev->dma_mask;
2509
2510         the_controller = dev;
2511         dev_set_drvdata(_dev, dev);
2512
2513         udc_disable(dev);
2514         udc_reinit(dev);
2515
2516         dev->vbus = is_vbus_present();
2517
2518         /* irq setup after old hardware state is cleaned up */
2519         retval = request_irq(IRQ_USB, pxa2xx_udc_irq,
2520                         SA_INTERRUPT, driver_name, dev);
2521         if (retval != 0) {
2522                 printk(KERN_ERR "%s: can't get irq %i, err %d\n",
2523                         driver_name, IRQ_USB, retval);
2524                 return -EBUSY;
2525         }
2526         dev->got_irq = 1;
2527
2528 #ifdef CONFIG_ARCH_LUBBOCK
2529         if (machine_is_lubbock()) {
2530                 retval = request_irq(LUBBOCK_USB_DISC_IRQ,
2531                                 lubbock_vbus_irq,
2532                                 SA_INTERRUPT | SA_SAMPLE_RANDOM,
2533                                 driver_name, dev);
2534                 if (retval != 0) {
2535                         printk(KERN_ERR "%s: can't get irq %i, err %d\n",
2536                                 driver_name, LUBBOCK_USB_DISC_IRQ, retval);
2537 lubbock_fail0:
2538                         free_irq(IRQ_USB, dev);
2539                         return -EBUSY;
2540                 }
2541                 retval = request_irq(LUBBOCK_USB_IRQ,
2542                                 lubbock_vbus_irq,
2543                                 SA_INTERRUPT | SA_SAMPLE_RANDOM,
2544                                 driver_name, dev);
2545                 if (retval != 0) {
2546                         printk(KERN_ERR "%s: can't get irq %i, err %d\n",
2547                                 driver_name, LUBBOCK_USB_IRQ, retval);
2548                         free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2549                         goto lubbock_fail0;
2550                 }
2551 #ifdef DEBUG
2552                 /* with U-Boot (but not BLOB), hex is off by default */
2553                 HEX_DISPLAY(dev->stats.irqs);
2554                 LUB_DISC_BLNK_LED &= 0xff;
2555 #endif
2556         }
2557 #endif
2558         create_proc_files();
2559
2560         return 0;
2561 }
2562
2563 static void pxa2xx_udc_shutdown(struct device *_dev)
2564 {
2565         pullup_off();
2566 }
2567
2568 static int __exit pxa2xx_udc_remove(struct device *_dev)
2569 {
2570         struct pxa2xx_udc *dev = dev_get_drvdata(_dev);
2571
2572         udc_disable(dev);
2573         remove_proc_files();
2574         usb_gadget_unregister_driver(dev->driver);
2575
2576         if (dev->got_irq) {
2577                 free_irq(IRQ_USB, dev);
2578                 dev->got_irq = 0;
2579         }
2580         if (machine_is_lubbock()) {
2581                 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2582                 free_irq(LUBBOCK_USB_IRQ, dev);
2583         }
2584         dev_set_drvdata(_dev, NULL);
2585         the_controller = NULL;
2586         return 0;
2587 }
2588
2589 /*-------------------------------------------------------------------------*/
2590
2591 #ifdef  CONFIG_PM
2592
2593 /* USB suspend (controlled by the host) and system suspend (controlled
2594  * by the PXA) don't necessarily work well together.  If USB is active,
2595  * the 48 MHz clock is required; so the system can't enter 33 MHz idle
2596  * mode, or any deeper PM saving state.
2597  *
2598  * For now, we punt and forcibly disconnect from the USB host when PXA
2599  * enters any suspend state.  While we're disconnected, we always disable
2600  * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states. 
2601  * Boards without software pullup control shouldn't use those states.
2602  * VBUS IRQs should probably be ignored so that the PXA device just acts
2603  * "dead" to USB hosts until system resume.
2604  */
2605 static int pxa2xx_udc_suspend(struct device *dev, pm_message_t state, u32 level)
2606 {
2607         struct pxa2xx_udc       *udc = dev_get_drvdata(dev);
2608
2609         if (level == SUSPEND_POWER_DOWN) {
2610                 if (!udc->mach->udc_command)
2611                         WARN("USB host won't detect disconnect!\n");
2612                 pullup(udc, 0);
2613         }
2614         return 0;
2615 }
2616
2617 static int pxa2xx_udc_resume(struct device *dev, u32 level)
2618 {
2619         struct pxa2xx_udc       *udc = dev_get_drvdata(dev);
2620
2621         if (level == RESUME_POWER_ON)
2622                 pullup(udc, 1);
2623         return 0;
2624 }
2625
2626 #else
2627 #define pxa2xx_udc_suspend      NULL
2628 #define pxa2xx_udc_resume       NULL
2629 #endif
2630
2631 /*-------------------------------------------------------------------------*/
2632
2633 static struct device_driver udc_driver = {
2634         .name           = "pxa2xx-udc",
2635         .bus            = &platform_bus_type,
2636         .probe          = pxa2xx_udc_probe,
2637         .shutdown       = pxa2xx_udc_shutdown,
2638         .remove         = __exit_p(pxa2xx_udc_remove),
2639         .suspend        = pxa2xx_udc_suspend,
2640         .resume         = pxa2xx_udc_resume,
2641 };
2642
2643 static int __init udc_init(void)
2644 {
2645         printk(KERN_INFO "%s: version %s\n", driver_name, DRIVER_VERSION);
2646         return driver_register(&udc_driver);
2647 }
2648 module_init(udc_init);
2649
2650 static void __exit udc_exit(void)
2651 {
2652         driver_unregister(&udc_driver);
2653 }
2654 module_exit(udc_exit);
2655
2656 MODULE_DESCRIPTION(DRIVER_DESC);
2657 MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
2658 MODULE_LICENSE("GPL");
2659