some kmalloc/memset ->kzalloc (tree wide)
[linux-2.6.git] / drivers / usb / gadget / goku_udc.c
1 /*
2  * Toshiba TC86C001 ("Goku-S") USB Device Controller driver
3  *
4  * Copyright (C) 2000-2002 Lineo
5  *      by Stuart Lynne, Tom Rushworth, and Bruce Balden
6  * Copyright (C) 2002 Toshiba Corporation
7  * Copyright (C) 2003 MontaVista Software (source@mvista.com)
8  *
9  * This file is licensed under the terms of the GNU General Public
10  * License version 2.  This program is licensed "as is" without any
11  * warranty of any kind, whether express or implied.
12  */
13
14 /*
15  * This device has ep0 and three semi-configurable bulk/interrupt endpoints.
16  *
17  *  - Endpoint numbering is fixed: ep{1,2,3}-bulk
18  *  - Gadget drivers can choose ep maxpacket (8/16/32/64)
19  *  - Gadget drivers can choose direction (IN, OUT)
20  *  - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
21  */
22
23 // #define      VERBOSE         /* extra debug messages (success too) */
24 // #define      USB_TRACE       /* packet-level success messages */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/pci.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/init.h>
34 #include <linux/timer.h>
35 #include <linux/list.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/device.h>
39 #include <linux/usb/ch9.h>
40 #include <linux/usb_gadget.h>
41
42 #include <asm/byteorder.h>
43 #include <asm/io.h>
44 #include <asm/irq.h>
45 #include <asm/system.h>
46 #include <asm/unaligned.h>
47
48
49 #include "goku_udc.h"
50
51 #define DRIVER_DESC             "TC86C001 USB Device Controller"
52 #define DRIVER_VERSION          "30-Oct 2003"
53
54 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
55
56 static const char driver_name [] = "goku_udc";
57 static const char driver_desc [] = DRIVER_DESC;
58
59 MODULE_AUTHOR("source@mvista.com");
60 MODULE_DESCRIPTION(DRIVER_DESC);
61 MODULE_LICENSE("GPL");
62
63
64 /*
65  * IN dma behaves ok under testing, though the IN-dma abort paths don't
66  * seem to behave quite as expected.  Used by default.
67  *
68  * OUT dma documents design problems handling the common "short packet"
69  * transfer termination policy; it couldn't be enabled by default, even
70  * if the OUT-dma abort problems had a resolution.
71  */
72 static unsigned use_dma = 1;
73
74 #if 0
75 //#include <linux/moduleparam.h>
76 /* "modprobe goku_udc use_dma=1" etc
77  *      0 to disable dma
78  *      1 to use IN dma only (normal operation)
79  *      2 to use IN and OUT dma
80  */
81 module_param(use_dma, uint, S_IRUGO);
82 #endif
83
84 /*-------------------------------------------------------------------------*/
85
86 static void nuke(struct goku_ep *, int status);
87
88 static inline void
89 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
90 {
91         writel(COMMAND_EP(epnum) | command, &regs->Command);
92         udelay(300);
93 }
94
95 static int
96 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
97 {
98         struct goku_udc *dev;
99         struct goku_ep  *ep;
100         u32             mode;
101         u16             max;
102         unsigned long   flags;
103
104         ep = container_of(_ep, struct goku_ep, ep);
105         if (!_ep || !desc || ep->desc
106                         || desc->bDescriptorType != USB_DT_ENDPOINT)
107                 return -EINVAL;
108         dev = ep->dev;
109         if (ep == &dev->ep[0])
110                 return -EINVAL;
111         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
112                 return -ESHUTDOWN;
113         if (ep->num != (desc->bEndpointAddress & 0x0f))
114                 return -EINVAL;
115
116         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
117         case USB_ENDPOINT_XFER_BULK:
118         case USB_ENDPOINT_XFER_INT:
119                 break;
120         default:
121                 return -EINVAL;
122         }
123
124         if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
125                         != EPxSTATUS_EP_INVALID)
126                 return -EBUSY;
127
128         /* enabling the no-toggle interrupt mode would need an api hook */
129         mode = 0;
130         max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
131         switch (max) {
132         case 64:        mode++;
133         case 32:        mode++;
134         case 16:        mode++;
135         case 8:         mode <<= 3;
136                         break;
137         default:
138                 return -EINVAL;
139         }
140         mode |= 2 << 1;         /* bulk, or intr-with-toggle */
141
142         /* ep1/ep2 dma direction is chosen early; it works in the other
143          * direction, with pio.  be cautious with out-dma.
144          */
145         ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
146         if (ep->is_in) {
147                 mode |= 1;
148                 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
149         } else {
150                 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
151                 if (ep->dma)
152                         DBG(dev, "%s out-dma hides short packets\n",
153                                 ep->ep.name);
154         }
155
156         spin_lock_irqsave(&ep->dev->lock, flags);
157
158         /* ep1 and ep2 can do double buffering and/or dma */
159         if (ep->num < 3) {
160                 struct goku_udc_regs __iomem    *regs = ep->dev->regs;
161                 u32                             tmp;
162
163                 /* double buffer except (for now) with pio in */
164                 tmp = ((ep->dma || !ep->is_in)
165                                 ? 0x10  /* double buffered */
166                                 : 0x11  /* single buffer */
167                         ) << ep->num;
168                 tmp |= readl(&regs->EPxSingle);
169                 writel(tmp, &regs->EPxSingle);
170
171                 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
172                 tmp |= readl(&regs->EPxBCS);
173                 writel(tmp, &regs->EPxBCS);
174         }
175         writel(mode, ep->reg_mode);
176         command(ep->dev->regs, COMMAND_RESET, ep->num);
177         ep->ep.maxpacket = max;
178         ep->stopped = 0;
179         ep->desc = desc;
180         spin_unlock_irqrestore(&ep->dev->lock, flags);
181
182         DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
183                 ep->is_in ? "IN" : "OUT",
184                 ep->dma ? "dma" : "pio",
185                 max);
186
187         return 0;
188 }
189
190 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
191 {
192         struct goku_udc         *dev = ep->dev;
193
194         if (regs) {
195                 command(regs, COMMAND_INVALID, ep->num);
196                 if (ep->num) {
197                         if (ep->num == UDC_MSTWR_ENDPOINT)
198                                 dev->int_enable &= ~(INT_MSTWREND
199                                                         |INT_MSTWRTMOUT);
200                         else if (ep->num == UDC_MSTRD_ENDPOINT)
201                                 dev->int_enable &= ~INT_MSTRDEND;
202                         dev->int_enable &= ~INT_EPxDATASET (ep->num);
203                 } else
204                         dev->int_enable &= ~INT_EP0;
205                 writel(dev->int_enable, &regs->int_enable);
206                 readl(&regs->int_enable);
207                 if (ep->num < 3) {
208                         struct goku_udc_regs __iomem    *r = ep->dev->regs;
209                         u32                             tmp;
210
211                         tmp = readl(&r->EPxSingle);
212                         tmp &= ~(0x11 << ep->num);
213                         writel(tmp, &r->EPxSingle);
214
215                         tmp = readl(&r->EPxBCS);
216                         tmp &= ~(0x11 << ep->num);
217                         writel(tmp, &r->EPxBCS);
218                 }
219                 /* reset dma in case we're still using it */
220                 if (ep->dma) {
221                         u32     master;
222
223                         master = readl(&regs->dma_master) & MST_RW_BITS;
224                         if (ep->num == UDC_MSTWR_ENDPOINT) {
225                                 master &= ~MST_W_BITS;
226                                 master |= MST_WR_RESET;
227                         } else {
228                                 master &= ~MST_R_BITS;
229                                 master |= MST_RD_RESET;
230                         }
231                         writel(master, &regs->dma_master);
232                 }
233         }
234
235         ep->ep.maxpacket = MAX_FIFO_SIZE;
236         ep->desc = NULL;
237         ep->stopped = 1;
238         ep->irqs = 0;
239         ep->dma = 0;
240 }
241
242 static int goku_ep_disable(struct usb_ep *_ep)
243 {
244         struct goku_ep  *ep;
245         struct goku_udc *dev;
246         unsigned long   flags;
247
248         ep = container_of(_ep, struct goku_ep, ep);
249         if (!_ep || !ep->desc)
250                 return -ENODEV;
251         dev = ep->dev;
252         if (dev->ep0state == EP0_SUSPEND)
253                 return -EBUSY;
254
255         VDBG(dev, "disable %s\n", _ep->name);
256
257         spin_lock_irqsave(&dev->lock, flags);
258         nuke(ep, -ESHUTDOWN);
259         ep_reset(dev->regs, ep);
260         spin_unlock_irqrestore(&dev->lock, flags);
261
262         return 0;
263 }
264
265 /*-------------------------------------------------------------------------*/
266
267 static struct usb_request *
268 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
269 {
270         struct goku_request     *req;
271
272         if (!_ep)
273                 return NULL;
274         req = kzalloc(sizeof *req, gfp_flags);
275         if (!req)
276                 return NULL;
277
278         req->req.dma = DMA_ADDR_INVALID;
279         INIT_LIST_HEAD(&req->queue);
280         return &req->req;
281 }
282
283 static void
284 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
285 {
286         struct goku_request     *req;
287
288         if (!_ep || !_req)
289                 return;
290
291         req = container_of(_req, struct goku_request, req);
292         WARN_ON(!list_empty(&req->queue));
293         kfree(req);
294 }
295
296 /*-------------------------------------------------------------------------*/
297
298 static void
299 done(struct goku_ep *ep, struct goku_request *req, int status)
300 {
301         struct goku_udc         *dev;
302         unsigned                stopped = ep->stopped;
303
304         list_del_init(&req->queue);
305
306         if (likely(req->req.status == -EINPROGRESS))
307                 req->req.status = status;
308         else
309                 status = req->req.status;
310
311         dev = ep->dev;
312         if (req->mapped) {
313                 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
314                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
315                 req->req.dma = DMA_ADDR_INVALID;
316                 req->mapped = 0;
317         }
318
319 #ifndef USB_TRACE
320         if (status && status != -ESHUTDOWN)
321 #endif
322                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
323                         ep->ep.name, &req->req, status,
324                         req->req.actual, req->req.length);
325
326         /* don't modify queue heads during completion callback */
327         ep->stopped = 1;
328         spin_unlock(&dev->lock);
329         req->req.complete(&ep->ep, &req->req);
330         spin_lock(&dev->lock);
331         ep->stopped = stopped;
332 }
333
334 /*-------------------------------------------------------------------------*/
335
336 static inline int
337 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
338 {
339         unsigned        length, count;
340
341         length = min(req->req.length - req->req.actual, max);
342         req->req.actual += length;
343
344         count = length;
345         while (likely(count--))
346                 writel(*buf++, fifo);
347         return length;
348 }
349
350 // return:  0 = still running, 1 = completed, negative = errno
351 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
352 {
353         struct goku_udc *dev = ep->dev;
354         u32             tmp;
355         u8              *buf;
356         unsigned        count;
357         int             is_last;
358
359         tmp = readl(&dev->regs->DataSet);
360         buf = req->req.buf + req->req.actual;
361         prefetch(buf);
362
363         dev = ep->dev;
364         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
365                 return -EL2HLT;
366
367         /* NOTE:  just single-buffered PIO-IN for now.  */
368         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
369                 return 0;
370
371         /* clear our "packet available" irq */
372         if (ep->num != 0)
373                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
374
375         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
376
377         /* last packet often short (sometimes a zlp, especially on ep0) */
378         if (unlikely(count != ep->ep.maxpacket)) {
379                 writel(~(1<<ep->num), &dev->regs->EOP);
380                 if (ep->num == 0) {
381                         dev->ep[0].stopped = 1;
382                         dev->ep0state = EP0_STATUS;
383                 }
384                 is_last = 1;
385         } else {
386                 if (likely(req->req.length != req->req.actual)
387                                 || req->req.zero)
388                         is_last = 0;
389                 else
390                         is_last = 1;
391         }
392 #if 0           /* printk seemed to trash is_last...*/
393 //#ifdef USB_TRACE
394         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
395                 ep->ep.name, count, is_last ? "/last" : "",
396                 req->req.length - req->req.actual, req);
397 #endif
398
399         /* requests complete when all IN data is in the FIFO,
400          * or sometimes later, if a zlp was needed.
401          */
402         if (is_last) {
403                 done(ep, req, 0);
404                 return 1;
405         }
406
407         return 0;
408 }
409
410 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
411 {
412         struct goku_udc_regs __iomem    *regs;
413         u32                             size, set;
414         u8                              *buf;
415         unsigned                        bufferspace, is_short, dbuff;
416
417         regs = ep->dev->regs;
418 top:
419         buf = req->req.buf + req->req.actual;
420         prefetchw(buf);
421
422         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
423                 return -EL2HLT;
424
425         dbuff = (ep->num == 1 || ep->num == 2);
426         do {
427                 /* ack dataset irq matching the status we'll handle */
428                 if (ep->num != 0)
429                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
430
431                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
432                 size = readl(&regs->EPxSizeLA[ep->num]);
433                 bufferspace = req->req.length - req->req.actual;
434
435                 /* usually do nothing without an OUT packet */
436                 if (likely(ep->num != 0 || bufferspace != 0)) {
437                         if (unlikely(set == 0))
438                                 break;
439                         /* use ep1/ep2 double-buffering for OUT */
440                         if (!(size & PACKET_ACTIVE))
441                                 size = readl(&regs->EPxSizeLB[ep->num]);
442                         if (!(size & PACKET_ACTIVE))    /* "can't happen" */
443                                 break;
444                         size &= DATASIZE;       /* EPxSizeH == 0 */
445
446                 /* ep0out no-out-data case for set_config, etc */
447                 } else
448                         size = 0;
449
450                 /* read all bytes from this packet */
451                 req->req.actual += size;
452                 is_short = (size < ep->ep.maxpacket);
453 #ifdef USB_TRACE
454                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
455                         ep->ep.name, size, is_short ? "/S" : "",
456                         req, req->req.actual, req->req.length);
457 #endif
458                 while (likely(size-- != 0)) {
459                         u8      byte = (u8) readl(ep->reg_fifo);
460
461                         if (unlikely(bufferspace == 0)) {
462                                 /* this happens when the driver's buffer
463                                  * is smaller than what the host sent.
464                                  * discard the extra data in this packet.
465                                  */
466                                 if (req->req.status != -EOVERFLOW)
467                                         DBG(ep->dev, "%s overflow %u\n",
468                                                 ep->ep.name, size);
469                                 req->req.status = -EOVERFLOW;
470                         } else {
471                                 *buf++ = byte;
472                                 bufferspace--;
473                         }
474                 }
475
476                 /* completion */
477                 if (unlikely(is_short || req->req.actual == req->req.length)) {
478                         if (unlikely(ep->num == 0)) {
479                                 /* non-control endpoints now usable? */
480                                 if (ep->dev->req_config)
481                                         writel(ep->dev->configured
482                                                         ? USBSTATE_CONFIGURED
483                                                         : 0,
484                                                 &regs->UsbState);
485                                 /* ep0out status stage */
486                                 writel(~(1<<0), &regs->EOP);
487                                 ep->stopped = 1;
488                                 ep->dev->ep0state = EP0_STATUS;
489                         }
490                         done(ep, req, 0);
491
492                         /* empty the second buffer asap */
493                         if (dbuff && !list_empty(&ep->queue)) {
494                                 req = list_entry(ep->queue.next,
495                                                 struct goku_request, queue);
496                                 goto top;
497                         }
498                         return 1;
499                 }
500         } while (dbuff);
501         return 0;
502 }
503
504 static inline void
505 pio_irq_enable(struct goku_udc *dev,
506                 struct goku_udc_regs __iomem *regs, int epnum)
507 {
508         dev->int_enable |= INT_EPxDATASET (epnum);
509         writel(dev->int_enable, &regs->int_enable);
510         /* write may still be posted */
511 }
512
513 static inline void
514 pio_irq_disable(struct goku_udc *dev,
515                 struct goku_udc_regs __iomem *regs, int epnum)
516 {
517         dev->int_enable &= ~INT_EPxDATASET (epnum);
518         writel(dev->int_enable, &regs->int_enable);
519         /* write may still be posted */
520 }
521
522 static inline void
523 pio_advance(struct goku_ep *ep)
524 {
525         struct goku_request     *req;
526
527         if (unlikely(list_empty (&ep->queue)))
528                 return;
529         req = list_entry(ep->queue.next, struct goku_request, queue);
530         (ep->is_in ? write_fifo : read_fifo)(ep, req);
531 }
532
533
534 /*-------------------------------------------------------------------------*/
535
536 // return:  0 = q running, 1 = q stopped, negative = errno
537 static int start_dma(struct goku_ep *ep, struct goku_request *req)
538 {
539         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
540         u32                             master;
541         u32                             start = req->req.dma;
542         u32                             end = start + req->req.length - 1;
543
544         master = readl(&regs->dma_master) & MST_RW_BITS;
545
546         /* re-init the bits affecting IN dma; careful with zlps */
547         if (likely(ep->is_in)) {
548                 if (unlikely(master & MST_RD_ENA)) {
549                         DBG (ep->dev, "start, IN active dma %03x!!\n",
550                                 master);
551 //                      return -EL2HLT;
552                 }
553                 writel(end, &regs->in_dma_end);
554                 writel(start, &regs->in_dma_start);
555
556                 master &= ~MST_R_BITS;
557                 if (unlikely(req->req.length == 0))
558                         master = MST_RD_ENA | MST_RD_EOPB;
559                 else if ((req->req.length % ep->ep.maxpacket) != 0
560                                         || req->req.zero)
561                         master = MST_RD_ENA | MST_EOPB_ENA;
562                 else
563                         master = MST_RD_ENA | MST_EOPB_DIS;
564
565                 ep->dev->int_enable |= INT_MSTRDEND;
566
567         /* Goku DMA-OUT merges short packets, which plays poorly with
568          * protocols where short packets mark the transfer boundaries.
569          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
570          * ending transfers after 3 SOFs; we don't turn it on.
571          */
572         } else {
573                 if (unlikely(master & MST_WR_ENA)) {
574                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
575                                 master);
576 //                      return -EL2HLT;
577                 }
578                 writel(end, &regs->out_dma_end);
579                 writel(start, &regs->out_dma_start);
580
581                 master &= ~MST_W_BITS;
582                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
583
584                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
585         }
586
587         writel(master, &regs->dma_master);
588         writel(ep->dev->int_enable, &regs->int_enable);
589         return 0;
590 }
591
592 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
593 {
594         struct goku_request             *req;
595         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
596         u32                             master;
597
598         master = readl(&regs->dma_master);
599
600         if (unlikely(list_empty(&ep->queue))) {
601 stop:
602                 if (ep->is_in)
603                         dev->int_enable &= ~INT_MSTRDEND;
604                 else
605                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
606                 writel(dev->int_enable, &regs->int_enable);
607                 return;
608         }
609         req = list_entry(ep->queue.next, struct goku_request, queue);
610
611         /* normal hw dma completion (not abort) */
612         if (likely(ep->is_in)) {
613                 if (unlikely(master & MST_RD_ENA))
614                         return;
615                 req->req.actual = readl(&regs->in_dma_current);
616         } else {
617                 if (unlikely(master & MST_WR_ENA))
618                         return;
619
620                 /* hardware merges short packets, and also hides packet
621                  * overruns.  a partial packet MAY be in the fifo here.
622                  */
623                 req->req.actual = readl(&regs->out_dma_current);
624         }
625         req->req.actual -= req->req.dma;
626         req->req.actual++;
627
628 #ifdef USB_TRACE
629         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
630                 ep->ep.name, ep->is_in ? "IN" : "OUT",
631                 req->req.actual, req->req.length, req);
632 #endif
633         done(ep, req, 0);
634         if (list_empty(&ep->queue))
635                 goto stop;
636         req = list_entry(ep->queue.next, struct goku_request, queue);
637         (void) start_dma(ep, req);
638 }
639
640 static void abort_dma(struct goku_ep *ep, int status)
641 {
642         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
643         struct goku_request             *req;
644         u32                             curr, master;
645
646         /* NAK future host requests, hoping the implicit delay lets the
647          * dma engine finish reading (or writing) its latest packet and
648          * empty the dma buffer (up to 16 bytes).
649          *
650          * This avoids needing to clean up a partial packet in the fifo;
651          * we can't do that for IN without side effects to HALT and TOGGLE.
652          */
653         command(regs, COMMAND_FIFO_DISABLE, ep->num);
654         req = list_entry(ep->queue.next, struct goku_request, queue);
655         master = readl(&regs->dma_master) & MST_RW_BITS;
656
657         /* FIXME using these resets isn't usably documented. this may
658          * not work unless it's followed by disabling the endpoint.
659          *
660          * FIXME the OUT reset path doesn't even behave consistently.
661          */
662         if (ep->is_in) {
663                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
664                         goto finished;
665                 curr = readl(&regs->in_dma_current);
666
667                 writel(curr, &regs->in_dma_end);
668                 writel(curr, &regs->in_dma_start);
669
670                 master &= ~MST_R_BITS;
671                 master |= MST_RD_RESET;
672                 writel(master, &regs->dma_master);
673
674                 if (readl(&regs->dma_master) & MST_RD_ENA)
675                         DBG(ep->dev, "IN dma active after reset!\n");
676
677         } else {
678                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
679                         goto finished;
680                 curr = readl(&regs->out_dma_current);
681
682                 writel(curr, &regs->out_dma_end);
683                 writel(curr, &regs->out_dma_start);
684
685                 master &= ~MST_W_BITS;
686                 master |= MST_WR_RESET;
687                 writel(master, &regs->dma_master);
688
689                 if (readl(&regs->dma_master) & MST_WR_ENA)
690                         DBG(ep->dev, "OUT dma active after reset!\n");
691         }
692         req->req.actual = (curr - req->req.dma) + 1;
693         req->req.status = status;
694
695         VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
696                 ep->is_in ? "IN" : "OUT",
697                 req->req.actual, req->req.length);
698
699         command(regs, COMMAND_FIFO_ENABLE, ep->num);
700
701         return;
702
703 finished:
704         /* dma already completed; no abort needed */
705         command(regs, COMMAND_FIFO_ENABLE, ep->num);
706         req->req.actual = req->req.length;
707         req->req.status = 0;
708 }
709
710 /*-------------------------------------------------------------------------*/
711
712 static int
713 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
714 {
715         struct goku_request     *req;
716         struct goku_ep          *ep;
717         struct goku_udc         *dev;
718         unsigned long           flags;
719         int                     status;
720
721         /* always require a cpu-view buffer so pio works */
722         req = container_of(_req, struct goku_request, req);
723         if (unlikely(!_req || !_req->complete
724                         || !_req->buf || !list_empty(&req->queue)))
725                 return -EINVAL;
726         ep = container_of(_ep, struct goku_ep, ep);
727         if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
728                 return -EINVAL;
729         dev = ep->dev;
730         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
731                 return -ESHUTDOWN;
732
733         /* can't touch registers when suspended */
734         if (dev->ep0state == EP0_SUSPEND)
735                 return -EBUSY;
736
737         /* set up dma mapping in case the caller didn't */
738         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
739                 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
740                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
741                 req->mapped = 1;
742         }
743
744 #ifdef USB_TRACE
745         VDBG(dev, "%s queue req %p, len %u buf %p\n",
746                         _ep->name, _req, _req->length, _req->buf);
747 #endif
748
749         spin_lock_irqsave(&dev->lock, flags);
750
751         _req->status = -EINPROGRESS;
752         _req->actual = 0;
753
754         /* for ep0 IN without premature status, zlp is required and
755          * writing EOP starts the status stage (OUT).
756          */
757         if (unlikely(ep->num == 0 && ep->is_in))
758                 _req->zero = 1;
759
760         /* kickstart this i/o queue? */
761         status = 0;
762         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
763                 /* dma:  done after dma completion IRQ (or error)
764                  * pio:  done after last fifo operation
765                  */
766                 if (ep->dma)
767                         status = start_dma(ep, req);
768                 else
769                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
770
771                 if (unlikely(status != 0)) {
772                         if (status > 0)
773                                 status = 0;
774                         req = NULL;
775                 }
776
777         } /* else pio or dma irq handler advances the queue. */
778
779         if (likely(req != 0))
780                 list_add_tail(&req->queue, &ep->queue);
781
782         if (likely(!list_empty(&ep->queue))
783                         && likely(ep->num != 0)
784                         && !ep->dma
785                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
786                 pio_irq_enable(dev, dev->regs, ep->num);
787
788         spin_unlock_irqrestore(&dev->lock, flags);
789
790         /* pci writes may still be posted */
791         return status;
792 }
793
794 /* dequeue ALL requests */
795 static void nuke(struct goku_ep *ep, int status)
796 {
797         struct goku_request     *req;
798
799         ep->stopped = 1;
800         if (list_empty(&ep->queue))
801                 return;
802         if (ep->dma)
803                 abort_dma(ep, status);
804         while (!list_empty(&ep->queue)) {
805                 req = list_entry(ep->queue.next, struct goku_request, queue);
806                 done(ep, req, status);
807         }
808 }
809
810 /* dequeue JUST ONE request */
811 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
812 {
813         struct goku_request     *req;
814         struct goku_ep          *ep;
815         struct goku_udc         *dev;
816         unsigned long           flags;
817
818         ep = container_of(_ep, struct goku_ep, ep);
819         if (!_ep || !_req || (!ep->desc && ep->num != 0))
820                 return -EINVAL;
821         dev = ep->dev;
822         if (!dev->driver)
823                 return -ESHUTDOWN;
824
825         /* we can't touch (dma) registers when suspended */
826         if (dev->ep0state == EP0_SUSPEND)
827                 return -EBUSY;
828
829         VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
830                 ep->is_in ? "IN" : "OUT",
831                 ep->dma ? "dma" : "pio",
832                 _req);
833
834         spin_lock_irqsave(&dev->lock, flags);
835
836         /* make sure it's actually queued on this endpoint */
837         list_for_each_entry (req, &ep->queue, queue) {
838                 if (&req->req == _req)
839                         break;
840         }
841         if (&req->req != _req) {
842                 spin_unlock_irqrestore (&dev->lock, flags);
843                 return -EINVAL;
844         }
845
846         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
847                 abort_dma(ep, -ECONNRESET);
848                 done(ep, req, -ECONNRESET);
849                 dma_advance(dev, ep);
850         } else if (!list_empty(&req->queue))
851                 done(ep, req, -ECONNRESET);
852         else
853                 req = NULL;
854         spin_unlock_irqrestore(&dev->lock, flags);
855
856         return req ? 0 : -EOPNOTSUPP;
857 }
858
859 /*-------------------------------------------------------------------------*/
860
861 static void goku_clear_halt(struct goku_ep *ep)
862 {
863         // assert (ep->num !=0)
864         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
865         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
866         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
867         if (ep->stopped) {
868                 ep->stopped = 0;
869                 if (ep->dma) {
870                         struct goku_request     *req;
871
872                         if (list_empty(&ep->queue))
873                                 return;
874                         req = list_entry(ep->queue.next, struct goku_request,
875                                                 queue);
876                         (void) start_dma(ep, req);
877                 } else
878                         pio_advance(ep);
879         }
880 }
881
882 static int goku_set_halt(struct usb_ep *_ep, int value)
883 {
884         struct goku_ep  *ep;
885         unsigned long   flags;
886         int             retval = 0;
887
888         if (!_ep)
889                 return -ENODEV;
890         ep = container_of (_ep, struct goku_ep, ep);
891
892         if (ep->num == 0) {
893                 if (value) {
894                         ep->dev->ep0state = EP0_STALL;
895                         ep->dev->ep[0].stopped = 1;
896                 } else
897                         return -EINVAL;
898
899         /* don't change EPxSTATUS_EP_INVALID to READY */
900         } else if (!ep->desc) {
901                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
902                 return -EINVAL;
903         }
904
905         spin_lock_irqsave(&ep->dev->lock, flags);
906         if (!list_empty(&ep->queue))
907                 retval = -EAGAIN;
908         else if (ep->is_in && value
909                         /* data in (either) packet buffer? */
910                         && (readl(&ep->dev->regs->DataSet)
911                                         & DATASET_AB(ep->num)))
912                 retval = -EAGAIN;
913         else if (!value)
914                 goku_clear_halt(ep);
915         else {
916                 ep->stopped = 1;
917                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
918                 command(ep->dev->regs, COMMAND_STALL, ep->num);
919                 readl(ep->reg_status);
920         }
921         spin_unlock_irqrestore(&ep->dev->lock, flags);
922         return retval;
923 }
924
925 static int goku_fifo_status(struct usb_ep *_ep)
926 {
927         struct goku_ep                  *ep;
928         struct goku_udc_regs __iomem    *regs;
929         u32                             size;
930
931         if (!_ep)
932                 return -ENODEV;
933         ep = container_of(_ep, struct goku_ep, ep);
934
935         /* size is only reported sanely for OUT */
936         if (ep->is_in)
937                 return -EOPNOTSUPP;
938
939         /* ignores 16-byte dma buffer; SizeH == 0 */
940         regs = ep->dev->regs;
941         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
942         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
943         VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
944         return size;
945 }
946
947 static void goku_fifo_flush(struct usb_ep *_ep)
948 {
949         struct goku_ep                  *ep;
950         struct goku_udc_regs __iomem    *regs;
951         u32                             size;
952
953         if (!_ep)
954                 return;
955         ep = container_of(_ep, struct goku_ep, ep);
956         VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
957
958         /* don't change EPxSTATUS_EP_INVALID to READY */
959         if (!ep->desc && ep->num != 0) {
960                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
961                 return;
962         }
963
964         regs = ep->dev->regs;
965         size = readl(&regs->EPxSizeLA[ep->num]);
966         size &= DATASIZE;
967
968         /* Non-desirable behavior:  FIFO_CLEAR also clears the
969          * endpoint halt feature.  For OUT, we _could_ just read
970          * the bytes out (PIO, if !ep->dma); for in, no choice.
971          */
972         if (size)
973                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
974 }
975
976 static struct usb_ep_ops goku_ep_ops = {
977         .enable         = goku_ep_enable,
978         .disable        = goku_ep_disable,
979
980         .alloc_request  = goku_alloc_request,
981         .free_request   = goku_free_request,
982
983         .queue          = goku_queue,
984         .dequeue        = goku_dequeue,
985
986         .set_halt       = goku_set_halt,
987         .fifo_status    = goku_fifo_status,
988         .fifo_flush     = goku_fifo_flush,
989 };
990
991 /*-------------------------------------------------------------------------*/
992
993 static int goku_get_frame(struct usb_gadget *_gadget)
994 {
995         return -EOPNOTSUPP;
996 }
997
998 static const struct usb_gadget_ops goku_ops = {
999         .get_frame      = goku_get_frame,
1000         // no remote wakeup
1001         // not selfpowered
1002 };
1003
1004 /*-------------------------------------------------------------------------*/
1005
1006 static inline char *dmastr(void)
1007 {
1008         if (use_dma == 0)
1009                 return "(dma disabled)";
1010         else if (use_dma == 2)
1011                 return "(dma IN and OUT)";
1012         else
1013                 return "(dma IN)";
1014 }
1015
1016 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1017
1018 static const char proc_node_name [] = "driver/udc";
1019
1020 #define FOURBITS "%s%s%s%s"
1021 #define EIGHTBITS FOURBITS FOURBITS
1022
1023 static void
1024 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1025 {
1026         int t;
1027
1028         /* int_status is the same format ... */
1029         t = scnprintf(*next, *size,
1030                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1031                 label, mask,
1032                 (mask & INT_PWRDETECT) ? " power" : "",
1033                 (mask & INT_SYSERROR) ? " sys" : "",
1034                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1035                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1036
1037                 (mask & INT_MSTWREND) ? " out-dma" : "",
1038                 (mask & INT_MSTWRSET) ? " wrset" : "",
1039                 (mask & INT_ERR) ? " err" : "",
1040                 (mask & INT_SOF) ? " sof" : "",
1041
1042                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1043                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1044                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1045                 (mask & INT_EP3DATASET) ? " ep3" : "",
1046
1047                 (mask & INT_EP2DATASET) ? " ep2" : "",
1048                 (mask & INT_EP1DATASET) ? " ep1" : "",
1049                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1050                 (mask & INT_STATUS) ? " ep0status" : "",
1051
1052                 (mask & INT_SETUP) ? " setup" : "",
1053                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1054                 (mask & INT_USBRESET) ? " reset" : "",
1055                 (mask & INT_SUSPEND) ? " suspend" : "");
1056         *size -= t;
1057         *next += t;
1058 }
1059
1060
1061 static int
1062 udc_proc_read(char *buffer, char **start, off_t off, int count,
1063                 int *eof, void *_dev)
1064 {
1065         char                            *buf = buffer;
1066         struct goku_udc                 *dev = _dev;
1067         struct goku_udc_regs __iomem    *regs = dev->regs;
1068         char                            *next = buf;
1069         unsigned                        size = count;
1070         unsigned long                   flags;
1071         int                             i, t, is_usb_connected;
1072         u32                             tmp;
1073
1074         if (off != 0)
1075                 return 0;
1076
1077         local_irq_save(flags);
1078
1079         /* basic device status */
1080         tmp = readl(&regs->power_detect);
1081         is_usb_connected = tmp & PW_DETECT;
1082         t = scnprintf(next, size,
1083                 "%s - %s\n"
1084                 "%s version: %s %s\n"
1085                 "Gadget driver: %s\n"
1086                 "Host %s, %s\n"
1087                 "\n",
1088                 pci_name(dev->pdev), driver_desc,
1089                 driver_name, DRIVER_VERSION, dmastr(),
1090                 dev->driver ? dev->driver->driver.name : "(none)",
1091                 is_usb_connected
1092                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1093                         : "disconnected",
1094                 ({char *state;
1095                 switch(dev->ep0state){
1096                 case EP0_DISCONNECT:    state = "ep0_disconnect"; break;
1097                 case EP0_IDLE:          state = "ep0_idle"; break;
1098                 case EP0_IN:            state = "ep0_in"; break;
1099                 case EP0_OUT:           state = "ep0_out"; break;
1100                 case EP0_STATUS:        state = "ep0_status"; break;
1101                 case EP0_STALL:         state = "ep0_stall"; break;
1102                 case EP0_SUSPEND:       state = "ep0_suspend"; break;
1103                 default:                state = "ep0_?"; break;
1104                 } state; })
1105                 );
1106         size -= t;
1107         next += t;
1108
1109         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1110         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1111
1112         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1113                 goto done;
1114
1115         /* registers for (active) device and ep0 */
1116         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1117                         "single.bcs %02x.%02x state %x addr %u\n",
1118                         dev->irqs, readl(&regs->DataSet),
1119                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1120                         readl(&regs->UsbState),
1121                         readl(&regs->address));
1122         size -= t;
1123         next += t;
1124
1125         tmp = readl(&regs->dma_master);
1126         t = scnprintf(next, size,
1127                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1128                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1129                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1130                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1131                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1132
1133                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1134                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1135                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1136                 (tmp & MST_RD_ENA) ? " IN" : "",
1137
1138                 (tmp & MST_WR_ENA) ? " OUT" : "",
1139                 (tmp & MST_CONNECTION)
1140                         ? "ep1in/ep2out"
1141                         : "ep1out/ep2in");
1142         size -= t;
1143         next += t;
1144
1145         /* dump endpoint queues */
1146         for (i = 0; i < 4; i++) {
1147                 struct goku_ep          *ep = &dev->ep [i];
1148                 struct goku_request     *req;
1149
1150                 if (i && !ep->desc)
1151                         continue;
1152
1153                 tmp = readl(ep->reg_status);
1154                 t = scnprintf(next, size,
1155                         "%s %s max %u %s, irqs %lu, "
1156                         "status %02x (%s) " FOURBITS "\n",
1157                         ep->ep.name,
1158                         ep->is_in ? "in" : "out",
1159                         ep->ep.maxpacket,
1160                         ep->dma ? "dma" : "pio",
1161                         ep->irqs,
1162                         tmp, ({ char *s;
1163                         switch (tmp & EPxSTATUS_EP_MASK) {
1164                         case EPxSTATUS_EP_READY:
1165                                 s = "ready"; break;
1166                         case EPxSTATUS_EP_DATAIN:
1167                                 s = "packet"; break;
1168                         case EPxSTATUS_EP_FULL:
1169                                 s = "full"; break;
1170                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1171                                 s = "tx_err"; break;
1172                         case EPxSTATUS_EP_RX_ERR:
1173                                 s = "rx_err"; break;
1174                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1175                                 s = "busy"; break;
1176                         case EPxSTATUS_EP_STALL:
1177                                 s = "stall"; break;
1178                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1179                                 s = "invalid"; break;
1180                         default:
1181                                 s = "?"; break;
1182                         }; s; }),
1183                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1184                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1185                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1186                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1187                         );
1188                 if (t <= 0 || t > size)
1189                         goto done;
1190                 size -= t;
1191                 next += t;
1192
1193                 if (list_empty(&ep->queue)) {
1194                         t = scnprintf(next, size, "\t(nothing queued)\n");
1195                         if (t <= 0 || t > size)
1196                                 goto done;
1197                         size -= t;
1198                         next += t;
1199                         continue;
1200                 }
1201                 list_for_each_entry(req, &ep->queue, queue) {
1202                         if (ep->dma && req->queue.prev == &ep->queue) {
1203                                 if (i == UDC_MSTRD_ENDPOINT)
1204                                         tmp = readl(&regs->in_dma_current);
1205                                 else
1206                                         tmp = readl(&regs->out_dma_current);
1207                                 tmp -= req->req.dma;
1208                                 tmp++;
1209                         } else
1210                                 tmp = req->req.actual;
1211
1212                         t = scnprintf(next, size,
1213                                 "\treq %p len %u/%u buf %p\n",
1214                                 &req->req, tmp, req->req.length,
1215                                 req->req.buf);
1216                         if (t <= 0 || t > size)
1217                                 goto done;
1218                         size -= t;
1219                         next += t;
1220                 }
1221         }
1222
1223 done:
1224         local_irq_restore(flags);
1225         *eof = 1;
1226         return count - size;
1227 }
1228
1229 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1230
1231 /*-------------------------------------------------------------------------*/
1232
1233 static void udc_reinit (struct goku_udc *dev)
1234 {
1235         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1236
1237         unsigned i;
1238
1239         INIT_LIST_HEAD (&dev->gadget.ep_list);
1240         dev->gadget.ep0 = &dev->ep [0].ep;
1241         dev->gadget.speed = USB_SPEED_UNKNOWN;
1242         dev->ep0state = EP0_DISCONNECT;
1243         dev->irqs = 0;
1244
1245         for (i = 0; i < 4; i++) {
1246                 struct goku_ep  *ep = &dev->ep[i];
1247
1248                 ep->num = i;
1249                 ep->ep.name = names[i];
1250                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1251                 ep->reg_status = &dev->regs->ep_status [i];
1252                 ep->reg_mode = &dev->regs->ep_mode[i];
1253
1254                 ep->ep.ops = &goku_ep_ops;
1255                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1256                 ep->dev = dev;
1257                 INIT_LIST_HEAD (&ep->queue);
1258
1259                 ep_reset(NULL, ep);
1260         }
1261
1262         dev->ep[0].reg_mode = NULL;
1263         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1264         list_del_init (&dev->ep[0].ep.ep_list);
1265 }
1266
1267 static void udc_reset(struct goku_udc *dev)
1268 {
1269         struct goku_udc_regs __iomem    *regs = dev->regs;
1270
1271         writel(0, &regs->power_detect);
1272         writel(0, &regs->int_enable);
1273         readl(&regs->int_enable);
1274         dev->int_enable = 0;
1275
1276         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1277          * don't let INT_PWRDETECT sequence begin
1278          */
1279         udelay(250);
1280         writel(PW_RESETB, &regs->power_detect);
1281         readl(&regs->int_enable);
1282 }
1283
1284 static void ep0_start(struct goku_udc *dev)
1285 {
1286         struct goku_udc_regs __iomem    *regs = dev->regs;
1287         unsigned                        i;
1288
1289         VDBG(dev, "%s\n", __FUNCTION__);
1290
1291         udc_reset(dev);
1292         udc_reinit (dev);
1293         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1294
1295         /* hw handles set_address, set_feature, get_status; maybe more */
1296         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1297                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1298                 | G_REQMODE_GET_DESC
1299                 | G_REQMODE_CLEAR_FEAT
1300                 , &regs->reqmode);
1301
1302         for (i = 0; i < 4; i++)
1303                 dev->ep[i].irqs = 0;
1304
1305         /* can't modify descriptors after writing UsbReady */
1306         for (i = 0; i < DESC_LEN; i++)
1307                 writel(0, &regs->descriptors[i]);
1308         writel(0, &regs->UsbReady);
1309
1310         /* expect ep0 requests when the host drops reset */
1311         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1312         dev->int_enable = INT_DEVWIDE | INT_EP0;
1313         writel(dev->int_enable, &dev->regs->int_enable);
1314         readl(&regs->int_enable);
1315         dev->gadget.speed = USB_SPEED_FULL;
1316         dev->ep0state = EP0_IDLE;
1317 }
1318
1319 static void udc_enable(struct goku_udc *dev)
1320 {
1321         /* start enumeration now, or after power detect irq */
1322         if (readl(&dev->regs->power_detect) & PW_DETECT)
1323                 ep0_start(dev);
1324         else {
1325                 DBG(dev, "%s\n", __FUNCTION__);
1326                 dev->int_enable = INT_PWRDETECT;
1327                 writel(dev->int_enable, &dev->regs->int_enable);
1328         }
1329 }
1330
1331 /*-------------------------------------------------------------------------*/
1332
1333 /* keeping it simple:
1334  * - one bus driver, initted first;
1335  * - one function driver, initted second
1336  */
1337
1338 static struct goku_udc  *the_controller;
1339
1340 /* when a driver is successfully registered, it will receive
1341  * control requests including set_configuration(), which enables
1342  * non-control requests.  then usb traffic follows until a
1343  * disconnect is reported.  then a host may connect again, or
1344  * the driver might get unbound.
1345  */
1346 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1347 {
1348         struct goku_udc *dev = the_controller;
1349         int                     retval;
1350
1351         if (!driver
1352                         || driver->speed != USB_SPEED_FULL
1353                         || !driver->bind
1354                         || !driver->disconnect
1355                         || !driver->setup)
1356                 return -EINVAL;
1357         if (!dev)
1358                 return -ENODEV;
1359         if (dev->driver)
1360                 return -EBUSY;
1361
1362         /* hook up the driver */
1363         driver->driver.bus = NULL;
1364         dev->driver = driver;
1365         dev->gadget.dev.driver = &driver->driver;
1366         retval = driver->bind(&dev->gadget);
1367         if (retval) {
1368                 DBG(dev, "bind to driver %s --> error %d\n",
1369                                 driver->driver.name, retval);
1370                 dev->driver = NULL;
1371                 dev->gadget.dev.driver = NULL;
1372                 return retval;
1373         }
1374
1375         /* then enable host detection and ep0; and we're ready
1376          * for set_configuration as well as eventual disconnect.
1377          */
1378         udc_enable(dev);
1379
1380         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1381         return 0;
1382 }
1383 EXPORT_SYMBOL(usb_gadget_register_driver);
1384
1385 static void
1386 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1387 {
1388         unsigned        i;
1389
1390         DBG (dev, "%s\n", __FUNCTION__);
1391
1392         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1393                 driver = NULL;
1394
1395         /* disconnect gadget driver after quiesceing hw and the driver */
1396         udc_reset (dev);
1397         for (i = 0; i < 4; i++)
1398                 nuke(&dev->ep [i], -ESHUTDOWN);
1399         if (driver) {
1400                 spin_unlock(&dev->lock);
1401                 driver->disconnect(&dev->gadget);
1402                 spin_lock(&dev->lock);
1403         }
1404
1405         if (dev->driver)
1406                 udc_enable(dev);
1407 }
1408
1409 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1410 {
1411         struct goku_udc *dev = the_controller;
1412         unsigned long   flags;
1413
1414         if (!dev)
1415                 return -ENODEV;
1416         if (!driver || driver != dev->driver || !driver->unbind)
1417                 return -EINVAL;
1418
1419         spin_lock_irqsave(&dev->lock, flags);
1420         dev->driver = NULL;
1421         stop_activity(dev, driver);
1422         spin_unlock_irqrestore(&dev->lock, flags);
1423
1424         driver->unbind(&dev->gadget);
1425
1426         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1427         return 0;
1428 }
1429 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1430
1431
1432 /*-------------------------------------------------------------------------*/
1433
1434 static void ep0_setup(struct goku_udc *dev)
1435 {
1436         struct goku_udc_regs __iomem    *regs = dev->regs;
1437         struct usb_ctrlrequest          ctrl;
1438         int                             tmp;
1439
1440         /* read SETUP packet and enter DATA stage */
1441         ctrl.bRequestType = readl(&regs->bRequestType);
1442         ctrl.bRequest = readl(&regs->bRequest);
1443         ctrl.wValue  = cpu_to_le16((readl(&regs->wValueH)  << 8)
1444                                         | readl(&regs->wValueL));
1445         ctrl.wIndex  = cpu_to_le16((readl(&regs->wIndexH)  << 8)
1446                                         | readl(&regs->wIndexL));
1447         ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1448                                         | readl(&regs->wLengthL));
1449         writel(0, &regs->SetupRecv);
1450
1451         nuke(&dev->ep[0], 0);
1452         dev->ep[0].stopped = 0;
1453         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1454                 dev->ep[0].is_in = 1;
1455                 dev->ep0state = EP0_IN;
1456                 /* detect early status stages */
1457                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1458         } else {
1459                 dev->ep[0].is_in = 0;
1460                 dev->ep0state = EP0_OUT;
1461
1462                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1463                  * synchronize transfer restarts after bulk IN stalls.  data
1464                  * won't even enter the fifo until the halt is cleared.
1465                  */
1466                 switch (ctrl.bRequest) {
1467                 case USB_REQ_CLEAR_FEATURE:
1468                         switch (ctrl.bRequestType) {
1469                         case USB_RECIP_ENDPOINT:
1470                                 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1471                                 /* active endpoint */
1472                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1473                                         goto stall;
1474                                 if (ctrl.wIndex & __constant_cpu_to_le16(
1475                                                 USB_DIR_IN)) {
1476                                         if (!dev->ep[tmp].is_in)
1477                                                 goto stall;
1478                                 } else {
1479                                         if (dev->ep[tmp].is_in)
1480                                                 goto stall;
1481                                 }
1482                                 if (ctrl.wValue != __constant_cpu_to_le16(
1483                                                 USB_ENDPOINT_HALT))
1484                                         goto stall;
1485                                 if (tmp)
1486                                         goku_clear_halt(&dev->ep[tmp]);
1487 succeed:
1488                                 /* start ep0out status stage */
1489                                 writel(~(1<<0), &regs->EOP);
1490                                 dev->ep[0].stopped = 1;
1491                                 dev->ep0state = EP0_STATUS;
1492                                 return;
1493                         case USB_RECIP_DEVICE:
1494                                 /* device remote wakeup: always clear */
1495                                 if (ctrl.wValue != __constant_cpu_to_le16(1))
1496                                         goto stall;
1497                                 VDBG(dev, "clear dev remote wakeup\n");
1498                                 goto succeed;
1499                         case USB_RECIP_INTERFACE:
1500                                 goto stall;
1501                         default:                /* pass to gadget driver */
1502                                 break;
1503                         }
1504                         break;
1505                 default:
1506                         break;
1507                 }
1508         }
1509
1510 #ifdef USB_TRACE
1511         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1512                 ctrl.bRequestType, ctrl.bRequest,
1513                 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1514                 le16_to_cpu(ctrl.wLength));
1515 #endif
1516
1517         /* hw wants to know when we're configured (or not) */
1518         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1519                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1520         if (unlikely(dev->req_config))
1521                 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1522
1523         /* delegate everything to the gadget driver.
1524          * it may respond after this irq handler returns.
1525          */
1526         spin_unlock (&dev->lock);
1527         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1528         spin_lock (&dev->lock);
1529         if (unlikely(tmp < 0)) {
1530 stall:
1531 #ifdef USB_TRACE
1532                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1533                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1534 #endif
1535                 command(regs, COMMAND_STALL, 0);
1536                 dev->ep[0].stopped = 1;
1537                 dev->ep0state = EP0_STALL;
1538         }
1539
1540         /* expect at least one data or status stage irq */
1541 }
1542
1543 #define ACK(irqbit) { \
1544                 stat &= ~irqbit; \
1545                 writel(~irqbit, &regs->int_status); \
1546                 handled = 1; \
1547                 }
1548
1549 static irqreturn_t goku_irq(int irq, void *_dev)
1550 {
1551         struct goku_udc                 *dev = _dev;
1552         struct goku_udc_regs __iomem    *regs = dev->regs;
1553         struct goku_ep                  *ep;
1554         u32                             stat, handled = 0;
1555         unsigned                        i, rescans = 5;
1556
1557         spin_lock(&dev->lock);
1558
1559 rescan:
1560         stat = readl(&regs->int_status) & dev->int_enable;
1561         if (!stat)
1562                 goto done;
1563         dev->irqs++;
1564
1565         /* device-wide irqs */
1566         if (unlikely(stat & INT_DEVWIDE)) {
1567                 if (stat & INT_SYSERROR) {
1568                         ERROR(dev, "system error\n");
1569                         stop_activity(dev, dev->driver);
1570                         stat = 0;
1571                         handled = 1;
1572                         // FIXME have a neater way to prevent re-enumeration
1573                         dev->driver = NULL;
1574                         goto done;
1575                 }
1576                 if (stat & INT_PWRDETECT) {
1577                         writel(~stat, &regs->int_status);
1578                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1579                                 VDBG(dev, "connect\n");
1580                                 ep0_start(dev);
1581                         } else {
1582                                 DBG(dev, "disconnect\n");
1583                                 if (dev->gadget.speed == USB_SPEED_FULL)
1584                                         stop_activity(dev, dev->driver);
1585                                 dev->ep0state = EP0_DISCONNECT;
1586                                 dev->int_enable = INT_DEVWIDE;
1587                                 writel(dev->int_enable, &dev->regs->int_enable);
1588                         }
1589                         stat = 0;
1590                         handled = 1;
1591                         goto done;
1592                 }
1593                 if (stat & INT_SUSPEND) {
1594                         ACK(INT_SUSPEND);
1595                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1596                                 switch (dev->ep0state) {
1597                                 case EP0_DISCONNECT:
1598                                 case EP0_SUSPEND:
1599                                         goto pm_next;
1600                                 default:
1601                                         break;
1602                                 }
1603                                 DBG(dev, "USB suspend\n");
1604                                 dev->ep0state = EP0_SUSPEND;
1605                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1606                                                 && dev->driver
1607                                                 && dev->driver->suspend) {
1608                                         spin_unlock(&dev->lock);
1609                                         dev->driver->suspend(&dev->gadget);
1610                                         spin_lock(&dev->lock);
1611                                 }
1612                         } else {
1613                                 if (dev->ep0state != EP0_SUSPEND) {
1614                                         DBG(dev, "bogus USB resume %d\n",
1615                                                 dev->ep0state);
1616                                         goto pm_next;
1617                                 }
1618                                 DBG(dev, "USB resume\n");
1619                                 dev->ep0state = EP0_IDLE;
1620                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1621                                                 && dev->driver
1622                                                 && dev->driver->resume) {
1623                                         spin_unlock(&dev->lock);
1624                                         dev->driver->resume(&dev->gadget);
1625                                         spin_lock(&dev->lock);
1626                                 }
1627                         }
1628                 }
1629 pm_next:
1630                 if (stat & INT_USBRESET) {              /* hub reset done */
1631                         ACK(INT_USBRESET);
1632                         INFO(dev, "USB reset done, gadget %s\n",
1633                                 dev->driver->driver.name);
1634                 }
1635                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1636         }
1637
1638         /* progress ep0 setup, data, or status stages.
1639          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1640          */
1641         if (stat & INT_SETUP) {
1642                 ACK(INT_SETUP);
1643                 dev->ep[0].irqs++;
1644                 ep0_setup(dev);
1645         }
1646         if (stat & INT_STATUSNAK) {
1647                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1648                 if (dev->ep0state == EP0_IN) {
1649                         ep = &dev->ep[0];
1650                         ep->irqs++;
1651                         nuke(ep, 0);
1652                         writel(~(1<<0), &regs->EOP);
1653                         dev->ep0state = EP0_STATUS;
1654                 }
1655         }
1656         if (stat & INT_ENDPOINT0) {
1657                 ACK(INT_ENDPOINT0);
1658                 ep = &dev->ep[0];
1659                 ep->irqs++;
1660                 pio_advance(ep);
1661         }
1662
1663         /* dma completion */
1664         if (stat & INT_MSTRDEND) {      /* IN */
1665                 ACK(INT_MSTRDEND);
1666                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1667                 ep->irqs++;
1668                 dma_advance(dev, ep);
1669         }
1670         if (stat & INT_MSTWREND) {      /* OUT */
1671                 ACK(INT_MSTWREND);
1672                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1673                 ep->irqs++;
1674                 dma_advance(dev, ep);
1675         }
1676         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1677                 ACK(INT_MSTWRTMOUT);
1678                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1679                 ep->irqs++;
1680                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1681                 // reset dma? then dma_advance()
1682         }
1683
1684         /* pio */
1685         for (i = 1; i < 4; i++) {
1686                 u32             tmp = INT_EPxDATASET(i);
1687
1688                 if (!(stat & tmp))
1689                         continue;
1690                 ep = &dev->ep[i];
1691                 pio_advance(ep);
1692                 if (list_empty (&ep->queue))
1693                         pio_irq_disable(dev, regs, i);
1694                 stat &= ~tmp;
1695                 handled = 1;
1696                 ep->irqs++;
1697         }
1698
1699         if (rescans--)
1700                 goto rescan;
1701
1702 done:
1703         (void)readl(&regs->int_enable);
1704         spin_unlock(&dev->lock);
1705         if (stat)
1706                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1707                                 readl(&regs->int_status), dev->int_enable);
1708         return IRQ_RETVAL(handled);
1709 }
1710
1711 #undef ACK
1712
1713 /*-------------------------------------------------------------------------*/
1714
1715 static void gadget_release(struct device *_dev)
1716 {
1717         struct goku_udc *dev = dev_get_drvdata(_dev);
1718
1719         kfree(dev);
1720 }
1721
1722 /* tear down the binding between this driver and the pci device */
1723
1724 static void goku_remove(struct pci_dev *pdev)
1725 {
1726         struct goku_udc         *dev = pci_get_drvdata(pdev);
1727
1728         DBG(dev, "%s\n", __FUNCTION__);
1729
1730         BUG_ON(dev->driver);
1731
1732 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1733         remove_proc_entry(proc_node_name, NULL);
1734 #endif
1735         if (dev->regs)
1736                 udc_reset(dev);
1737         if (dev->got_irq)
1738                 free_irq(pdev->irq, dev);
1739         if (dev->regs)
1740                 iounmap(dev->regs);
1741         if (dev->got_region)
1742                 release_mem_region(pci_resource_start (pdev, 0),
1743                                 pci_resource_len (pdev, 0));
1744         if (dev->enabled)
1745                 pci_disable_device(pdev);
1746         device_unregister(&dev->gadget.dev);
1747
1748         pci_set_drvdata(pdev, NULL);
1749         dev->regs = NULL;
1750         the_controller = NULL;
1751
1752         INFO(dev, "unbind\n");
1753 }
1754
1755 /* wrap this driver around the specified pci device, but
1756  * don't respond over USB until a gadget driver binds to us.
1757  */
1758
1759 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1760 {
1761         struct goku_udc         *dev = NULL;
1762         unsigned long           resource, len;
1763         void __iomem            *base = NULL;
1764         int                     retval;
1765
1766         /* if you want to support more than one controller in a system,
1767          * usb_gadget_driver_{register,unregister}() must change.
1768          */
1769         if (the_controller) {
1770                 WARN(dev, "ignoring %s\n", pci_name(pdev));
1771                 return -EBUSY;
1772         }
1773         if (!pdev->irq) {
1774                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1775                 retval = -ENODEV;
1776                 goto done;
1777         }
1778
1779         /* alloc, and start init */
1780         dev = kzalloc (sizeof *dev, GFP_KERNEL);
1781         if (dev == NULL){
1782                 pr_debug("enomem %s\n", pci_name(pdev));
1783                 retval = -ENOMEM;
1784                 goto done;
1785         }
1786
1787         spin_lock_init(&dev->lock);
1788         dev->pdev = pdev;
1789         dev->gadget.ops = &goku_ops;
1790
1791         /* the "gadget" abstracts/virtualizes the controller */
1792         strcpy(dev->gadget.dev.bus_id, "gadget");
1793         dev->gadget.dev.parent = &pdev->dev;
1794         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1795         dev->gadget.dev.release = gadget_release;
1796         dev->gadget.name = driver_name;
1797
1798         /* now all the pci goodies ... */
1799         retval = pci_enable_device(pdev);
1800         if (retval < 0) {
1801                 DBG(dev, "can't enable, %d\n", retval);
1802                 goto done;
1803         }
1804         dev->enabled = 1;
1805
1806         resource = pci_resource_start(pdev, 0);
1807         len = pci_resource_len(pdev, 0);
1808         if (!request_mem_region(resource, len, driver_name)) {
1809                 DBG(dev, "controller already in use\n");
1810                 retval = -EBUSY;
1811                 goto done;
1812         }
1813         dev->got_region = 1;
1814
1815         base = ioremap_nocache(resource, len);
1816         if (base == NULL) {
1817                 DBG(dev, "can't map memory\n");
1818                 retval = -EFAULT;
1819                 goto done;
1820         }
1821         dev->regs = (struct goku_udc_regs __iomem *) base;
1822
1823         pci_set_drvdata(pdev, dev);
1824         INFO(dev, "%s\n", driver_desc);
1825         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1826         INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1827
1828         /* init to known state, then setup irqs */
1829         udc_reset(dev);
1830         udc_reinit (dev);
1831         if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1832                         driver_name, dev) != 0) {
1833                 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1834                 retval = -EBUSY;
1835                 goto done;
1836         }
1837         dev->got_irq = 1;
1838         if (use_dma)
1839                 pci_set_master(pdev);
1840
1841
1842 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1843         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1844 #endif
1845
1846         /* done */
1847         the_controller = dev;
1848         retval = device_register(&dev->gadget.dev);
1849         if (retval == 0)
1850                 return 0;
1851
1852 done:
1853         if (dev)
1854                 goku_remove (pdev);
1855         return retval;
1856 }
1857
1858
1859 /*-------------------------------------------------------------------------*/
1860
1861 static struct pci_device_id pci_ids [] = { {
1862         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1863         .class_mask =   ~0,
1864         .vendor =       0x102f,         /* Toshiba */
1865         .device =       0x0107,         /* this UDC */
1866         .subvendor =    PCI_ANY_ID,
1867         .subdevice =    PCI_ANY_ID,
1868
1869 }, { /* end: all zeroes */ }
1870 };
1871 MODULE_DEVICE_TABLE (pci, pci_ids);
1872
1873 static struct pci_driver goku_pci_driver = {
1874         .name =         (char *) driver_name,
1875         .id_table =     pci_ids,
1876
1877         .probe =        goku_probe,
1878         .remove =       goku_remove,
1879
1880         /* FIXME add power management support */
1881 };
1882
1883 static int __init init (void)
1884 {
1885         return pci_register_driver (&goku_pci_driver);
1886 }
1887 module_init (init);
1888
1889 static void __exit cleanup (void)
1890 {
1891         pci_unregister_driver (&goku_pci_driver);
1892 }
1893 module_exit (cleanup);