Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/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/timer.h>
 34 #include <linux/list.h>
 35 #include <linux/interrupt.h>
 36 #include <linux/proc_fs.h>
 37 #include <linux/seq_file.h>
 38 #include <linux/device.h>
 39 #include <linux/usb/ch9.h>
 40 #include <linux/usb/gadget.h>
 41 #include <linux/prefetch.h>
 42 
 43 #include <asm/byteorder.h>
 44 #include <asm/io.h>
 45 #include <asm/irq.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 static const char driver_name [] = "goku_udc";
 55 static const char driver_desc [] = DRIVER_DESC;
 56 
 57 MODULE_AUTHOR("source@mvista.com");
 58 MODULE_DESCRIPTION(DRIVER_DESC);
 59 MODULE_LICENSE("GPL");
 60 
 61 
 62 /*
 63  * IN dma behaves ok under testing, though the IN-dma abort paths don't
 64  * seem to behave quite as expected.  Used by default.
 65  *
 66  * OUT dma documents design problems handling the common "short packet"
 67  * transfer termination policy; it couldn't be enabled by default, even
 68  * if the OUT-dma abort problems had a resolution.
 69  */
 70 static unsigned use_dma = 1;
 71 
 72 #if 0
 73 //#include <linux/moduleparam.h>
 74 /* "modprobe goku_udc use_dma=1" etc
 75  *      0 to disable dma
 76  *      1 to use IN dma only (normal operation)
 77  *      2 to use IN and OUT dma
 78  */
 79 module_param(use_dma, uint, S_IRUGO);
 80 #endif
 81 
 82 /*-------------------------------------------------------------------------*/
 83 
 84 static void nuke(struct goku_ep *, int status);
 85 
 86 static inline void
 87 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
 88 {
 89         writel(COMMAND_EP(epnum) | command, &regs->Command);
 90         udelay(300);
 91 }
 92 
 93 static int
 94 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 95 {
 96         struct goku_udc *dev;
 97         struct goku_ep  *ep;
 98         u32             mode;
 99         u16             max;
100         unsigned long   flags;
101 
102         ep = container_of(_ep, struct goku_ep, ep);
103         if (!_ep || !desc
104                         || desc->bDescriptorType != USB_DT_ENDPOINT)
105                 return -EINVAL;
106         dev = ep->dev;
107         if (ep == &dev->ep[0])
108                 return -EINVAL;
109         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
110                 return -ESHUTDOWN;
111         if (ep->num != usb_endpoint_num(desc))
112                 return -EINVAL;
113 
114         switch (usb_endpoint_type(desc)) {
115         case USB_ENDPOINT_XFER_BULK:
116         case USB_ENDPOINT_XFER_INT:
117                 break;
118         default:
119                 return -EINVAL;
120         }
121 
122         if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
123                         != EPxSTATUS_EP_INVALID)
124                 return -EBUSY;
125 
126         /* enabling the no-toggle interrupt mode would need an api hook */
127         mode = 0;
128         max = get_unaligned_le16(&desc->wMaxPacketSize);
129         switch (max) {
130         case 64:        mode++;
131         case 32:        mode++;
132         case 16:        mode++;
133         case 8:         mode <<= 3;
134                         break;
135         default:
136                 return -EINVAL;
137         }
138         mode |= 2 << 1;         /* bulk, or intr-with-toggle */
139 
140         /* ep1/ep2 dma direction is chosen early; it works in the other
141          * direction, with pio.  be cautious with out-dma.
142          */
143         ep->is_in = usb_endpoint_dir_in(desc);
144         if (ep->is_in) {
145                 mode |= 1;
146                 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
147         } else {
148                 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
149                 if (ep->dma)
150                         DBG(dev, "%s out-dma hides short packets\n",
151                                 ep->ep.name);
152         }
153 
154         spin_lock_irqsave(&ep->dev->lock, flags);
155 
156         /* ep1 and ep2 can do double buffering and/or dma */
157         if (ep->num < 3) {
158                 struct goku_udc_regs __iomem    *regs = ep->dev->regs;
159                 u32                             tmp;
160 
161                 /* double buffer except (for now) with pio in */
162                 tmp = ((ep->dma || !ep->is_in)
163                                 ? 0x10  /* double buffered */
164                                 : 0x11  /* single buffer */
165                         ) << ep->num;
166                 tmp |= readl(&regs->EPxSingle);
167                 writel(tmp, &regs->EPxSingle);
168 
169                 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
170                 tmp |= readl(&regs->EPxBCS);
171                 writel(tmp, &regs->EPxBCS);
172         }
173         writel(mode, ep->reg_mode);
174         command(ep->dev->regs, COMMAND_RESET, ep->num);
175         ep->ep.maxpacket = max;
176         ep->stopped = 0;
177         ep->ep.desc = desc;
178         spin_unlock_irqrestore(&ep->dev->lock, flags);
179 
180         DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
181                 ep->is_in ? "IN" : "OUT",
182                 ep->dma ? "dma" : "pio",
183                 max);
184 
185         return 0;
186 }
187 
188 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
189 {
190         struct goku_udc         *dev = ep->dev;
191 
192         if (regs) {
193                 command(regs, COMMAND_INVALID, ep->num);
194                 if (ep->num) {
195                         if (ep->num == UDC_MSTWR_ENDPOINT)
196                                 dev->int_enable &= ~(INT_MSTWREND
197                                                         |INT_MSTWRTMOUT);
198                         else if (ep->num == UDC_MSTRD_ENDPOINT)
199                                 dev->int_enable &= ~INT_MSTRDEND;
200                         dev->int_enable &= ~INT_EPxDATASET (ep->num);
201                 } else
202                         dev->int_enable &= ~INT_EP0;
203                 writel(dev->int_enable, &regs->int_enable);
204                 readl(&regs->int_enable);
205                 if (ep->num < 3) {
206                         struct goku_udc_regs __iomem    *r = ep->dev->regs;
207                         u32                             tmp;
208 
209                         tmp = readl(&r->EPxSingle);
210                         tmp &= ~(0x11 << ep->num);
211                         writel(tmp, &r->EPxSingle);
212 
213                         tmp = readl(&r->EPxBCS);
214                         tmp &= ~(0x11 << ep->num);
215                         writel(tmp, &r->EPxBCS);
216                 }
217                 /* reset dma in case we're still using it */
218                 if (ep->dma) {
219                         u32     master;
220 
221                         master = readl(&regs->dma_master) & MST_RW_BITS;
222                         if (ep->num == UDC_MSTWR_ENDPOINT) {
223                                 master &= ~MST_W_BITS;
224                                 master |= MST_WR_RESET;
225                         } else {
226                                 master &= ~MST_R_BITS;
227                                 master |= MST_RD_RESET;
228                         }
229                         writel(master, &regs->dma_master);
230                 }
231         }
232 
233         usb_ep_set_maxpacket_limit(&ep->ep, MAX_FIFO_SIZE);
234         ep->ep.desc = NULL;
235         ep->stopped = 1;
236         ep->irqs = 0;
237         ep->dma = 0;
238 }
239 
240 static int goku_ep_disable(struct usb_ep *_ep)
241 {
242         struct goku_ep  *ep;
243         struct goku_udc *dev;
244         unsigned long   flags;
245 
246         ep = container_of(_ep, struct goku_ep, ep);
247         if (!_ep || !ep->ep.desc)
248                 return -ENODEV;
249         dev = ep->dev;
250         if (dev->ep0state == EP0_SUSPEND)
251                 return -EBUSY;
252 
253         VDBG(dev, "disable %s\n", _ep->name);
254 
255         spin_lock_irqsave(&dev->lock, flags);
256         nuke(ep, -ESHUTDOWN);
257         ep_reset(dev->regs, ep);
258         spin_unlock_irqrestore(&dev->lock, flags);
259 
260         return 0;
261 }
262 
263 /*-------------------------------------------------------------------------*/
264 
265 static struct usb_request *
266 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
267 {
268         struct goku_request     *req;
269 
270         if (!_ep)
271                 return NULL;
272         req = kzalloc(sizeof *req, gfp_flags);
273         if (!req)
274                 return NULL;
275 
276         INIT_LIST_HEAD(&req->queue);
277         return &req->req;
278 }
279 
280 static void
281 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
282 {
283         struct goku_request     *req;
284 
285         if (!_ep || !_req)
286                 return;
287 
288         req = container_of(_req, struct goku_request, req);
289         WARN_ON(!list_empty(&req->queue));
290         kfree(req);
291 }
292 
293 /*-------------------------------------------------------------------------*/
294 
295 static void
296 done(struct goku_ep *ep, struct goku_request *req, int status)
297 {
298         struct goku_udc         *dev;
299         unsigned                stopped = ep->stopped;
300 
301         list_del_init(&req->queue);
302 
303         if (likely(req->req.status == -EINPROGRESS))
304                 req->req.status = status;
305         else
306                 status = req->req.status;
307 
308         dev = ep->dev;
309 
310         if (ep->dma)
311                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
312 
313 #ifndef USB_TRACE
314         if (status && status != -ESHUTDOWN)
315 #endif
316                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
317                         ep->ep.name, &req->req, status,
318                         req->req.actual, req->req.length);
319 
320         /* don't modify queue heads during completion callback */
321         ep->stopped = 1;
322         spin_unlock(&dev->lock);
323         req->req.complete(&ep->ep, &req->req);
324         spin_lock(&dev->lock);
325         ep->stopped = stopped;
326 }
327 
328 /*-------------------------------------------------------------------------*/
329 
330 static inline int
331 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
332 {
333         unsigned        length, count;
334 
335         length = min(req->req.length - req->req.actual, max);
336         req->req.actual += length;
337 
338         count = length;
339         while (likely(count--))
340                 writel(*buf++, fifo);
341         return length;
342 }
343 
344 // return:  0 = still running, 1 = completed, negative = errno
345 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
346 {
347         struct goku_udc *dev = ep->dev;
348         u32             tmp;
349         u8              *buf;
350         unsigned        count;
351         int             is_last;
352 
353         tmp = readl(&dev->regs->DataSet);
354         buf = req->req.buf + req->req.actual;
355         prefetch(buf);
356 
357         dev = ep->dev;
358         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
359                 return -EL2HLT;
360 
361         /* NOTE:  just single-buffered PIO-IN for now.  */
362         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
363                 return 0;
364 
365         /* clear our "packet available" irq */
366         if (ep->num != 0)
367                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
368 
369         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
370 
371         /* last packet often short (sometimes a zlp, especially on ep0) */
372         if (unlikely(count != ep->ep.maxpacket)) {
373                 writel(~(1<<ep->num), &dev->regs->EOP);
374                 if (ep->num == 0) {
375                         dev->ep[0].stopped = 1;
376                         dev->ep0state = EP0_STATUS;
377                 }
378                 is_last = 1;
379         } else {
380                 if (likely(req->req.length != req->req.actual)
381                                 || req->req.zero)
382                         is_last = 0;
383                 else
384                         is_last = 1;
385         }
386 #if 0           /* printk seemed to trash is_last...*/
387 //#ifdef USB_TRACE
388         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
389                 ep->ep.name, count, is_last ? "/last" : "",
390                 req->req.length - req->req.actual, req);
391 #endif
392 
393         /* requests complete when all IN data is in the FIFO,
394          * or sometimes later, if a zlp was needed.
395          */
396         if (is_last) {
397                 done(ep, req, 0);
398                 return 1;
399         }
400 
401         return 0;
402 }
403 
404 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
405 {
406         struct goku_udc_regs __iomem    *regs;
407         u32                             size, set;
408         u8                              *buf;
409         unsigned                        bufferspace, is_short, dbuff;
410 
411         regs = ep->dev->regs;
412 top:
413         buf = req->req.buf + req->req.actual;
414         prefetchw(buf);
415 
416         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
417                 return -EL2HLT;
418 
419         dbuff = (ep->num == 1 || ep->num == 2);
420         do {
421                 /* ack dataset irq matching the status we'll handle */
422                 if (ep->num != 0)
423                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
424 
425                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
426                 size = readl(&regs->EPxSizeLA[ep->num]);
427                 bufferspace = req->req.length - req->req.actual;
428 
429                 /* usually do nothing without an OUT packet */
430                 if (likely(ep->num != 0 || bufferspace != 0)) {
431                         if (unlikely(set == 0))
432                                 break;
433                         /* use ep1/ep2 double-buffering for OUT */
434                         if (!(size & PACKET_ACTIVE))
435                                 size = readl(&regs->EPxSizeLB[ep->num]);
436                         if (!(size & PACKET_ACTIVE))    /* "can't happen" */
437                                 break;
438                         size &= DATASIZE;       /* EPxSizeH == 0 */
439 
440                 /* ep0out no-out-data case for set_config, etc */
441                 } else
442                         size = 0;
443 
444                 /* read all bytes from this packet */
445                 req->req.actual += size;
446                 is_short = (size < ep->ep.maxpacket);
447 #ifdef USB_TRACE
448                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
449                         ep->ep.name, size, is_short ? "/S" : "",
450                         req, req->req.actual, req->req.length);
451 #endif
452                 while (likely(size-- != 0)) {
453                         u8      byte = (u8) readl(ep->reg_fifo);
454 
455                         if (unlikely(bufferspace == 0)) {
456                                 /* this happens when the driver's buffer
457                                  * is smaller than what the host sent.
458                                  * discard the extra data in this packet.
459                                  */
460                                 if (req->req.status != -EOVERFLOW)
461                                         DBG(ep->dev, "%s overflow %u\n",
462                                                 ep->ep.name, size);
463                                 req->req.status = -EOVERFLOW;
464                         } else {
465                                 *buf++ = byte;
466                                 bufferspace--;
467                         }
468                 }
469 
470                 /* completion */
471                 if (unlikely(is_short || req->req.actual == req->req.length)) {
472                         if (unlikely(ep->num == 0)) {
473                                 /* non-control endpoints now usable? */
474                                 if (ep->dev->req_config)
475                                         writel(ep->dev->configured
476                                                         ? USBSTATE_CONFIGURED
477                                                         : 0,
478                                                 &regs->UsbState);
479                                 /* ep0out status stage */
480                                 writel(~(1<<0), &regs->EOP);
481                                 ep->stopped = 1;
482                                 ep->dev->ep0state = EP0_STATUS;
483                         }
484                         done(ep, req, 0);
485 
486                         /* empty the second buffer asap */
487                         if (dbuff && !list_empty(&ep->queue)) {
488                                 req = list_entry(ep->queue.next,
489                                                 struct goku_request, queue);
490                                 goto top;
491                         }
492                         return 1;
493                 }
494         } while (dbuff);
495         return 0;
496 }
497 
498 static inline void
499 pio_irq_enable(struct goku_udc *dev,
500                 struct goku_udc_regs __iomem *regs, int epnum)
501 {
502         dev->int_enable |= INT_EPxDATASET (epnum);
503         writel(dev->int_enable, &regs->int_enable);
504         /* write may still be posted */
505 }
506 
507 static inline void
508 pio_irq_disable(struct goku_udc *dev,
509                 struct goku_udc_regs __iomem *regs, int epnum)
510 {
511         dev->int_enable &= ~INT_EPxDATASET (epnum);
512         writel(dev->int_enable, &regs->int_enable);
513         /* write may still be posted */
514 }
515 
516 static inline void
517 pio_advance(struct goku_ep *ep)
518 {
519         struct goku_request     *req;
520 
521         if (unlikely(list_empty (&ep->queue)))
522                 return;
523         req = list_entry(ep->queue.next, struct goku_request, queue);
524         (ep->is_in ? write_fifo : read_fifo)(ep, req);
525 }
526 
527 
528 /*-------------------------------------------------------------------------*/
529 
530 // return:  0 = q running, 1 = q stopped, negative = errno
531 static int start_dma(struct goku_ep *ep, struct goku_request *req)
532 {
533         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
534         u32                             master;
535         u32                             start = req->req.dma;
536         u32                             end = start + req->req.length - 1;
537 
538         master = readl(&regs->dma_master) & MST_RW_BITS;
539 
540         /* re-init the bits affecting IN dma; careful with zlps */
541         if (likely(ep->is_in)) {
542                 if (unlikely(master & MST_RD_ENA)) {
543                         DBG (ep->dev, "start, IN active dma %03x!!\n",
544                                 master);
545 //                      return -EL2HLT;
546                 }
547                 writel(end, &regs->in_dma_end);
548                 writel(start, &regs->in_dma_start);
549 
550                 master &= ~MST_R_BITS;
551                 if (unlikely(req->req.length == 0))
552                         master = MST_RD_ENA | MST_RD_EOPB;
553                 else if ((req->req.length % ep->ep.maxpacket) != 0
554                                         || req->req.zero)
555                         master = MST_RD_ENA | MST_EOPB_ENA;
556                 else
557                         master = MST_RD_ENA | MST_EOPB_DIS;
558 
559                 ep->dev->int_enable |= INT_MSTRDEND;
560 
561         /* Goku DMA-OUT merges short packets, which plays poorly with
562          * protocols where short packets mark the transfer boundaries.
563          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
564          * ending transfers after 3 SOFs; we don't turn it on.
565          */
566         } else {
567                 if (unlikely(master & MST_WR_ENA)) {
568                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
569                                 master);
570 //                      return -EL2HLT;
571                 }
572                 writel(end, &regs->out_dma_end);
573                 writel(start, &regs->out_dma_start);
574 
575                 master &= ~MST_W_BITS;
576                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
577 
578                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
579         }
580 
581         writel(master, &regs->dma_master);
582         writel(ep->dev->int_enable, &regs->int_enable);
583         return 0;
584 }
585 
586 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
587 {
588         struct goku_request             *req;
589         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
590         u32                             master;
591 
592         master = readl(&regs->dma_master);
593 
594         if (unlikely(list_empty(&ep->queue))) {
595 stop:
596                 if (ep->is_in)
597                         dev->int_enable &= ~INT_MSTRDEND;
598                 else
599                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
600                 writel(dev->int_enable, &regs->int_enable);
601                 return;
602         }
603         req = list_entry(ep->queue.next, struct goku_request, queue);
604 
605         /* normal hw dma completion (not abort) */
606         if (likely(ep->is_in)) {
607                 if (unlikely(master & MST_RD_ENA))
608                         return;
609                 req->req.actual = readl(&regs->in_dma_current);
610         } else {
611                 if (unlikely(master & MST_WR_ENA))
612                         return;
613 
614                 /* hardware merges short packets, and also hides packet
615                  * overruns.  a partial packet MAY be in the fifo here.
616                  */
617                 req->req.actual = readl(&regs->out_dma_current);
618         }
619         req->req.actual -= req->req.dma;
620         req->req.actual++;
621 
622 #ifdef USB_TRACE
623         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
624                 ep->ep.name, ep->is_in ? "IN" : "OUT",
625                 req->req.actual, req->req.length, req);
626 #endif
627         done(ep, req, 0);
628         if (list_empty(&ep->queue))
629                 goto stop;
630         req = list_entry(ep->queue.next, struct goku_request, queue);
631         (void) start_dma(ep, req);
632 }
633 
634 static void abort_dma(struct goku_ep *ep, int status)
635 {
636         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
637         struct goku_request             *req;
638         u32                             curr, master;
639 
640         /* NAK future host requests, hoping the implicit delay lets the
641          * dma engine finish reading (or writing) its latest packet and
642          * empty the dma buffer (up to 16 bytes).
643          *
644          * This avoids needing to clean up a partial packet in the fifo;
645          * we can't do that for IN without side effects to HALT and TOGGLE.
646          */
647         command(regs, COMMAND_FIFO_DISABLE, ep->num);
648         req = list_entry(ep->queue.next, struct goku_request, queue);
649         master = readl(&regs->dma_master) & MST_RW_BITS;
650 
651         /* FIXME using these resets isn't usably documented. this may
652          * not work unless it's followed by disabling the endpoint.
653          *
654          * FIXME the OUT reset path doesn't even behave consistently.
655          */
656         if (ep->is_in) {
657                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
658                         goto finished;
659                 curr = readl(&regs->in_dma_current);
660 
661                 writel(curr, &regs->in_dma_end);
662                 writel(curr, &regs->in_dma_start);
663 
664                 master &= ~MST_R_BITS;
665                 master |= MST_RD_RESET;
666                 writel(master, &regs->dma_master);
667 
668                 if (readl(&regs->dma_master) & MST_RD_ENA)
669                         DBG(ep->dev, "IN dma active after reset!\n");
670 
671         } else {
672                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
673                         goto finished;
674                 curr = readl(&regs->out_dma_current);
675 
676                 writel(curr, &regs->out_dma_end);
677                 writel(curr, &regs->out_dma_start);
678 
679                 master &= ~MST_W_BITS;
680                 master |= MST_WR_RESET;
681                 writel(master, &regs->dma_master);
682 
683                 if (readl(&regs->dma_master) & MST_WR_ENA)
684                         DBG(ep->dev, "OUT dma active after reset!\n");
685         }
686         req->req.actual = (curr - req->req.dma) + 1;
687         req->req.status = status;
688 
689         VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name,
690                 ep->is_in ? "IN" : "OUT",
691                 req->req.actual, req->req.length);
692 
693         command(regs, COMMAND_FIFO_ENABLE, ep->num);
694 
695         return;
696 
697 finished:
698         /* dma already completed; no abort needed */
699         command(regs, COMMAND_FIFO_ENABLE, ep->num);
700         req->req.actual = req->req.length;
701         req->req.status = 0;
702 }
703 
704 /*-------------------------------------------------------------------------*/
705 
706 static int
707 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
708 {
709         struct goku_request     *req;
710         struct goku_ep          *ep;
711         struct goku_udc         *dev;
712         unsigned long           flags;
713         int                     status;
714 
715         /* always require a cpu-view buffer so pio works */
716         req = container_of(_req, struct goku_request, req);
717         if (unlikely(!_req || !_req->complete
718                         || !_req->buf || !list_empty(&req->queue)))
719                 return -EINVAL;
720         ep = container_of(_ep, struct goku_ep, ep);
721         if (unlikely(!_ep || (!ep->ep.desc && ep->num != 0)))
722                 return -EINVAL;
723         dev = ep->dev;
724         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
725                 return -ESHUTDOWN;
726 
727         /* can't touch registers when suspended */
728         if (dev->ep0state == EP0_SUSPEND)
729                 return -EBUSY;
730 
731         /* set up dma mapping in case the caller didn't */
732         if (ep->dma) {
733                 status = usb_gadget_map_request(&dev->gadget, &req->req,
734                                 ep->is_in);
735                 if (status)
736                         return status;
737         }
738 
739 #ifdef USB_TRACE
740         VDBG(dev, "%s queue req %p, len %u buf %p\n",
741                         _ep->name, _req, _req->length, _req->buf);
742 #endif
743 
744         spin_lock_irqsave(&dev->lock, flags);
745 
746         _req->status = -EINPROGRESS;
747         _req->actual = 0;
748 
749         /* for ep0 IN without premature status, zlp is required and
750          * writing EOP starts the status stage (OUT).
751          */
752         if (unlikely(ep->num == 0 && ep->is_in))
753                 _req->zero = 1;
754 
755         /* kickstart this i/o queue? */
756         status = 0;
757         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
758                 /* dma:  done after dma completion IRQ (or error)
759                  * pio:  done after last fifo operation
760                  */
761                 if (ep->dma)
762                         status = start_dma(ep, req);
763                 else
764                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
765 
766                 if (unlikely(status != 0)) {
767                         if (status > 0)
768                                 status = 0;
769                         req = NULL;
770                 }
771 
772         } /* else pio or dma irq handler advances the queue. */
773 
774         if (likely(req != NULL))
775                 list_add_tail(&req->queue, &ep->queue);
776 
777         if (likely(!list_empty(&ep->queue))
778                         && likely(ep->num != 0)
779                         && !ep->dma
780                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
781                 pio_irq_enable(dev, dev->regs, ep->num);
782 
783         spin_unlock_irqrestore(&dev->lock, flags);
784 
785         /* pci writes may still be posted */
786         return status;
787 }
788 
789 /* dequeue ALL requests */
790 static void nuke(struct goku_ep *ep, int status)
791 {
792         struct goku_request     *req;
793 
794         ep->stopped = 1;
795         if (list_empty(&ep->queue))
796                 return;
797         if (ep->dma)
798                 abort_dma(ep, status);
799         while (!list_empty(&ep->queue)) {
800                 req = list_entry(ep->queue.next, struct goku_request, queue);
801                 done(ep, req, status);
802         }
803 }
804 
805 /* dequeue JUST ONE request */
806 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
807 {
808         struct goku_request     *req;
809         struct goku_ep          *ep;
810         struct goku_udc         *dev;
811         unsigned long           flags;
812 
813         ep = container_of(_ep, struct goku_ep, ep);
814         if (!_ep || !_req || (!ep->ep.desc && ep->num != 0))
815                 return -EINVAL;
816         dev = ep->dev;
817         if (!dev->driver)
818                 return -ESHUTDOWN;
819 
820         /* we can't touch (dma) registers when suspended */
821         if (dev->ep0state == EP0_SUSPEND)
822                 return -EBUSY;
823 
824         VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name,
825                 ep->is_in ? "IN" : "OUT",
826                 ep->dma ? "dma" : "pio",
827                 _req);
828 
829         spin_lock_irqsave(&dev->lock, flags);
830 
831         /* make sure it's actually queued on this endpoint */
832         list_for_each_entry (req, &ep->queue, queue) {
833                 if (&req->req == _req)
834                         break;
835         }
836         if (&req->req != _req) {
837                 spin_unlock_irqrestore (&dev->lock, flags);
838                 return -EINVAL;
839         }
840 
841         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
842                 abort_dma(ep, -ECONNRESET);
843                 done(ep, req, -ECONNRESET);
844                 dma_advance(dev, ep);
845         } else if (!list_empty(&req->queue))
846                 done(ep, req, -ECONNRESET);
847         else
848                 req = NULL;
849         spin_unlock_irqrestore(&dev->lock, flags);
850 
851         return req ? 0 : -EOPNOTSUPP;
852 }
853 
854 /*-------------------------------------------------------------------------*/
855 
856 static void goku_clear_halt(struct goku_ep *ep)
857 {
858         // assert (ep->num !=0)
859         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
860         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
861         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
862         if (ep->stopped) {
863                 ep->stopped = 0;
864                 if (ep->dma) {
865                         struct goku_request     *req;
866 
867                         if (list_empty(&ep->queue))
868                                 return;
869                         req = list_entry(ep->queue.next, struct goku_request,
870                                                 queue);
871                         (void) start_dma(ep, req);
872                 } else
873                         pio_advance(ep);
874         }
875 }
876 
877 static int goku_set_halt(struct usb_ep *_ep, int value)
878 {
879         struct goku_ep  *ep;
880         unsigned long   flags;
881         int             retval = 0;
882 
883         if (!_ep)
884                 return -ENODEV;
885         ep = container_of (_ep, struct goku_ep, ep);
886 
887         if (ep->num == 0) {
888                 if (value) {
889                         ep->dev->ep0state = EP0_STALL;
890                         ep->dev->ep[0].stopped = 1;
891                 } else
892                         return -EINVAL;
893 
894         /* don't change EPxSTATUS_EP_INVALID to READY */
895         } else if (!ep->ep.desc) {
896                 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
897                 return -EINVAL;
898         }
899 
900         spin_lock_irqsave(&ep->dev->lock, flags);
901         if (!list_empty(&ep->queue))
902                 retval = -EAGAIN;
903         else if (ep->is_in && value
904                         /* data in (either) packet buffer? */
905                         && (readl(&ep->dev->regs->DataSet)
906                                         & DATASET_AB(ep->num)))
907                 retval = -EAGAIN;
908         else if (!value)
909                 goku_clear_halt(ep);
910         else {
911                 ep->stopped = 1;
912                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
913                 command(ep->dev->regs, COMMAND_STALL, ep->num);
914                 readl(ep->reg_status);
915         }
916         spin_unlock_irqrestore(&ep->dev->lock, flags);
917         return retval;
918 }
919 
920 static int goku_fifo_status(struct usb_ep *_ep)
921 {
922         struct goku_ep                  *ep;
923         struct goku_udc_regs __iomem    *regs;
924         u32                             size;
925 
926         if (!_ep)
927                 return -ENODEV;
928         ep = container_of(_ep, struct goku_ep, ep);
929 
930         /* size is only reported sanely for OUT */
931         if (ep->is_in)
932                 return -EOPNOTSUPP;
933 
934         /* ignores 16-byte dma buffer; SizeH == 0 */
935         regs = ep->dev->regs;
936         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
937         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
938         VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size);
939         return size;
940 }
941 
942 static void goku_fifo_flush(struct usb_ep *_ep)
943 {
944         struct goku_ep                  *ep;
945         struct goku_udc_regs __iomem    *regs;
946         u32                             size;
947 
948         if (!_ep)
949                 return;
950         ep = container_of(_ep, struct goku_ep, ep);
951         VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name);
952 
953         /* don't change EPxSTATUS_EP_INVALID to READY */
954         if (!ep->ep.desc && ep->num != 0) {
955                 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
956                 return;
957         }
958 
959         regs = ep->dev->regs;
960         size = readl(&regs->EPxSizeLA[ep->num]);
961         size &= DATASIZE;
962 
963         /* Non-desirable behavior:  FIFO_CLEAR also clears the
964          * endpoint halt feature.  For OUT, we _could_ just read
965          * the bytes out (PIO, if !ep->dma); for in, no choice.
966          */
967         if (size)
968                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
969 }
970 
971 static struct usb_ep_ops goku_ep_ops = {
972         .enable         = goku_ep_enable,
973         .disable        = goku_ep_disable,
974 
975         .alloc_request  = goku_alloc_request,
976         .free_request   = goku_free_request,
977 
978         .queue          = goku_queue,
979         .dequeue        = goku_dequeue,
980 
981         .set_halt       = goku_set_halt,
982         .fifo_status    = goku_fifo_status,
983         .fifo_flush     = goku_fifo_flush,
984 };
985 
986 /*-------------------------------------------------------------------------*/
987 
988 static int goku_get_frame(struct usb_gadget *_gadget)
989 {
990         return -EOPNOTSUPP;
991 }
992 
993 static int goku_udc_start(struct usb_gadget *g,
994                 struct usb_gadget_driver *driver);
995 static int goku_udc_stop(struct usb_gadget *g,
996                 struct usb_gadget_driver *driver);
997 
998 static const struct usb_gadget_ops goku_ops = {
999         .get_frame      = goku_get_frame,
1000         .udc_start      = goku_udc_start,
1001         .udc_stop       = goku_udc_stop,
1002         // no remote wakeup
1003         // not selfpowered
1004 };
1005 
1006 /*-------------------------------------------------------------------------*/
1007 
1008 static inline const char *dmastr(void)
1009 {
1010         if (use_dma == 0)
1011                 return "(dma disabled)";
1012         else if (use_dma == 2)
1013                 return "(dma IN and OUT)";
1014         else
1015                 return "(dma IN)";
1016 }
1017 
1018 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1019 
1020 static const char proc_node_name [] = "driver/udc";
1021 
1022 #define FOURBITS "%s%s%s%s"
1023 #define EIGHTBITS FOURBITS FOURBITS
1024 
1025 static void dump_intmask(struct seq_file *m, const char *label, u32 mask)
1026 {
1027         /* int_status is the same format ... */
1028         seq_printf(m,
1029                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1030                 label, mask,
1031                 (mask & INT_PWRDETECT) ? " power" : "",
1032                 (mask & INT_SYSERROR) ? " sys" : "",
1033                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1034                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1035 
1036                 (mask & INT_MSTWREND) ? " out-dma" : "",
1037                 (mask & INT_MSTWRSET) ? " wrset" : "",
1038                 (mask & INT_ERR) ? " err" : "",
1039                 (mask & INT_SOF) ? " sof" : "",
1040 
1041                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1042                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1043                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1044                 (mask & INT_EP3DATASET) ? " ep3" : "",
1045 
1046                 (mask & INT_EP2DATASET) ? " ep2" : "",
1047                 (mask & INT_EP1DATASET) ? " ep1" : "",
1048                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1049                 (mask & INT_STATUS) ? " ep0status" : "",
1050 
1051                 (mask & INT_SETUP) ? " setup" : "",
1052                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1053                 (mask & INT_USBRESET) ? " reset" : "",
1054                 (mask & INT_SUSPEND) ? " suspend" : "");
1055 }
1056 
1057 
1058 static int udc_proc_read(struct seq_file *m, void *v)
1059 {
1060         struct goku_udc                 *dev = m->private;
1061         struct goku_udc_regs __iomem    *regs = dev->regs;
1062         unsigned long                   flags;
1063         int                             i, is_usb_connected;
1064         u32                             tmp;
1065 
1066         local_irq_save(flags);
1067 
1068         /* basic device status */
1069         tmp = readl(&regs->power_detect);
1070         is_usb_connected = tmp & PW_DETECT;
1071         seq_printf(m,
1072                 "%s - %s\n"
1073                 "%s version: %s %s\n"
1074                 "Gadget driver: %s\n"
1075                 "Host %s, %s\n"
1076                 "\n",
1077                 pci_name(dev->pdev), driver_desc,
1078                 driver_name, DRIVER_VERSION, dmastr(),
1079                 dev->driver ? dev->driver->driver.name : "(none)",
1080                 is_usb_connected
1081                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1082                         : "disconnected",
1083                 ({const char *state;
1084                 switch(dev->ep0state){
1085                 case EP0_DISCONNECT:    state = "ep0_disconnect"; break;
1086                 case EP0_IDLE:          state = "ep0_idle"; break;
1087                 case EP0_IN:            state = "ep0_in"; break;
1088                 case EP0_OUT:           state = "ep0_out"; break;
1089                 case EP0_STATUS:        state = "ep0_status"; break;
1090                 case EP0_STALL:         state = "ep0_stall"; break;
1091                 case EP0_SUSPEND:       state = "ep0_suspend"; break;
1092                 default:                state = "ep0_?"; break;
1093                 } state; })
1094                 );
1095 
1096         dump_intmask(m, "int_status", readl(&regs->int_status));
1097         dump_intmask(m, "int_enable", readl(&regs->int_enable));
1098 
1099         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1100                 goto done;
1101 
1102         /* registers for (active) device and ep0 */
1103         if (seq_printf(m, "\nirqs %lu\ndataset %02x "
1104                         "single.bcs %02x.%02x state %x addr %u\n",
1105                         dev->irqs, readl(&regs->DataSet),
1106                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1107                         readl(&regs->UsbState),
1108                         readl(&regs->address)) < 0)
1109                 goto done;
1110 
1111         tmp = readl(&regs->dma_master);
1112         if (seq_printf(m,
1113                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1114                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1115                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1116                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1117                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1118 
1119                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1120                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1121                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1122                 (tmp & MST_RD_ENA) ? " IN" : "",
1123 
1124                 (tmp & MST_WR_ENA) ? " OUT" : "",
1125                 (tmp & MST_CONNECTION)
1126                         ? "ep1in/ep2out"
1127                         : "ep1out/ep2in") < 0)
1128                 goto done;
1129 
1130         /* dump endpoint queues */
1131         for (i = 0; i < 4; i++) {
1132                 struct goku_ep          *ep = &dev->ep [i];
1133                 struct goku_request     *req;
1134 
1135                 if (i && !ep->ep.desc)
1136                         continue;
1137 
1138                 tmp = readl(ep->reg_status);
1139                 if (seq_printf(m,
1140                         "%s %s max %u %s, irqs %lu, "
1141                         "status %02x (%s) " FOURBITS "\n",
1142                         ep->ep.name,
1143                         ep->is_in ? "in" : "out",
1144                         ep->ep.maxpacket,
1145                         ep->dma ? "dma" : "pio",
1146                         ep->irqs,
1147                         tmp, ({ char *s;
1148                         switch (tmp & EPxSTATUS_EP_MASK) {
1149                         case EPxSTATUS_EP_READY:
1150                                 s = "ready"; break;
1151                         case EPxSTATUS_EP_DATAIN:
1152                                 s = "packet"; break;
1153                         case EPxSTATUS_EP_FULL:
1154                                 s = "full"; break;
1155                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1156                                 s = "tx_err"; break;
1157                         case EPxSTATUS_EP_RX_ERR:
1158                                 s = "rx_err"; break;
1159                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1160                                 s = "busy"; break;
1161                         case EPxSTATUS_EP_STALL:
1162                                 s = "stall"; break;
1163                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1164                                 s = "invalid"; break;
1165                         default:
1166                                 s = "?"; break;
1167                         } s; }),
1168                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1169                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1170                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1171                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1172                         ) < 0)
1173                         goto done;
1174 
1175                 if (list_empty(&ep->queue)) {
1176                         if (seq_puts(m, "\t(nothing queued)\n") < 0)
1177                                 goto done;
1178                         continue;
1179                 }
1180                 list_for_each_entry(req, &ep->queue, queue) {
1181                         if (ep->dma && req->queue.prev == &ep->queue) {
1182                                 if (i == UDC_MSTRD_ENDPOINT)
1183                                         tmp = readl(&regs->in_dma_current);
1184                                 else
1185                                         tmp = readl(&regs->out_dma_current);
1186                                 tmp -= req->req.dma;
1187                                 tmp++;
1188                         } else
1189                                 tmp = req->req.actual;
1190 
1191                         if (seq_printf(m,
1192                                 "\treq %p len %u/%u buf %p\n",
1193                                 &req->req, tmp, req->req.length,
1194                                 req->req.buf) < 0)
1195                                 goto done;
1196                 }
1197         }
1198 
1199 done:
1200         local_irq_restore(flags);
1201         return 0;
1202 }
1203 
1204 /*
1205  * seq_file wrappers for procfile show routines.
1206  */
1207 static int udc_proc_open(struct inode *inode, struct file *file)
1208 {
1209         return single_open(file, udc_proc_read, PDE_DATA(file_inode(file)));
1210 }
1211 
1212 static const struct file_operations udc_proc_fops = {
1213         .open           = udc_proc_open,
1214         .read           = seq_read,
1215         .llseek         = seq_lseek,
1216         .release        = single_release,
1217 };
1218 
1219 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1220 
1221 /*-------------------------------------------------------------------------*/
1222 
1223 static void udc_reinit (struct goku_udc *dev)
1224 {
1225         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1226 
1227         unsigned i;
1228 
1229         INIT_LIST_HEAD (&dev->gadget.ep_list);
1230         dev->gadget.ep0 = &dev->ep [0].ep;
1231         dev->gadget.speed = USB_SPEED_UNKNOWN;
1232         dev->ep0state = EP0_DISCONNECT;
1233         dev->irqs = 0;
1234 
1235         for (i = 0; i < 4; i++) {
1236                 struct goku_ep  *ep = &dev->ep[i];
1237 
1238                 ep->num = i;
1239                 ep->ep.name = names[i];
1240                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1241                 ep->reg_status = &dev->regs->ep_status [i];
1242                 ep->reg_mode = &dev->regs->ep_mode[i];
1243 
1244                 ep->ep.ops = &goku_ep_ops;
1245                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1246                 ep->dev = dev;
1247                 INIT_LIST_HEAD (&ep->queue);
1248 
1249                 ep_reset(NULL, ep);
1250         }
1251 
1252         dev->ep[0].reg_mode = NULL;
1253         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, MAX_EP0_SIZE);
1254         list_del_init (&dev->ep[0].ep.ep_list);
1255 }
1256 
1257 static void udc_reset(struct goku_udc *dev)
1258 {
1259         struct goku_udc_regs __iomem    *regs = dev->regs;
1260 
1261         writel(0, &regs->power_detect);
1262         writel(0, &regs->int_enable);
1263         readl(&regs->int_enable);
1264         dev->int_enable = 0;
1265 
1266         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1267          * don't let INT_PWRDETECT sequence begin
1268          */
1269         udelay(250);
1270         writel(PW_RESETB, &regs->power_detect);
1271         readl(&regs->int_enable);
1272 }
1273 
1274 static void ep0_start(struct goku_udc *dev)
1275 {
1276         struct goku_udc_regs __iomem    *regs = dev->regs;
1277         unsigned                        i;
1278 
1279         VDBG(dev, "%s\n", __func__);
1280 
1281         udc_reset(dev);
1282         udc_reinit (dev);
1283         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1284 
1285         /* hw handles set_address, set_feature, get_status; maybe more */
1286         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1287                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1288                 | G_REQMODE_GET_DESC
1289                 | G_REQMODE_CLEAR_FEAT
1290                 , &regs->reqmode);
1291 
1292         for (i = 0; i < 4; i++)
1293                 dev->ep[i].irqs = 0;
1294 
1295         /* can't modify descriptors after writing UsbReady */
1296         for (i = 0; i < DESC_LEN; i++)
1297                 writel(0, &regs->descriptors[i]);
1298         writel(0, &regs->UsbReady);
1299 
1300         /* expect ep0 requests when the host drops reset */
1301         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1302         dev->int_enable = INT_DEVWIDE | INT_EP0;
1303         writel(dev->int_enable, &dev->regs->int_enable);
1304         readl(&regs->int_enable);
1305         dev->gadget.speed = USB_SPEED_FULL;
1306         dev->ep0state = EP0_IDLE;
1307 }
1308 
1309 static void udc_enable(struct goku_udc *dev)
1310 {
1311         /* start enumeration now, or after power detect irq */
1312         if (readl(&dev->regs->power_detect) & PW_DETECT)
1313                 ep0_start(dev);
1314         else {
1315                 DBG(dev, "%s\n", __func__);
1316                 dev->int_enable = INT_PWRDETECT;
1317                 writel(dev->int_enable, &dev->regs->int_enable);
1318         }
1319 }
1320 
1321 /*-------------------------------------------------------------------------*/
1322 
1323 /* keeping it simple:
1324  * - one bus driver, initted first;
1325  * - one function driver, initted second
1326  */
1327 
1328 /* when a driver is successfully registered, it will receive
1329  * control requests including set_configuration(), which enables
1330  * non-control requests.  then usb traffic follows until a
1331  * disconnect is reported.  then a host may connect again, or
1332  * the driver might get unbound.
1333  */
1334 static int goku_udc_start(struct usb_gadget *g,
1335                 struct usb_gadget_driver *driver)
1336 {
1337         struct goku_udc *dev = to_goku_udc(g);
1338 
1339         /* hook up the driver */
1340         driver->driver.bus = NULL;
1341         dev->driver = driver;
1342 
1343         /*
1344          * then enable host detection and ep0; and we're ready
1345          * for set_configuration as well as eventual disconnect.
1346          */
1347         udc_enable(dev);
1348 
1349         return 0;
1350 }
1351 
1352 static void stop_activity(struct goku_udc *dev)
1353 {
1354         unsigned        i;
1355 
1356         DBG (dev, "%s\n", __func__);
1357 
1358         /* disconnect gadget driver after quiesceing hw and the driver */
1359         udc_reset (dev);
1360         for (i = 0; i < 4; i++)
1361                 nuke(&dev->ep [i], -ESHUTDOWN);
1362 
1363         if (dev->driver)
1364                 udc_enable(dev);
1365 }
1366 
1367 static int goku_udc_stop(struct usb_gadget *g,
1368                 struct usb_gadget_driver *driver)
1369 {
1370         struct goku_udc *dev = to_goku_udc(g);
1371         unsigned long   flags;
1372 
1373         spin_lock_irqsave(&dev->lock, flags);
1374         dev->driver = NULL;
1375         stop_activity(dev);
1376         spin_unlock_irqrestore(&dev->lock, flags);
1377 
1378         return 0;
1379 }
1380 
1381 /*-------------------------------------------------------------------------*/
1382 
1383 static void ep0_setup(struct goku_udc *dev)
1384 {
1385         struct goku_udc_regs __iomem    *regs = dev->regs;
1386         struct usb_ctrlrequest          ctrl;
1387         int                             tmp;
1388 
1389         /* read SETUP packet and enter DATA stage */
1390         ctrl.bRequestType = readl(&regs->bRequestType);
1391         ctrl.bRequest = readl(&regs->bRequest);
1392         ctrl.wValue  = cpu_to_le16((readl(&regs->wValueH)  << 8)
1393                                         | readl(&regs->wValueL));
1394         ctrl.wIndex  = cpu_to_le16((readl(&regs->wIndexH)  << 8)
1395                                         | readl(&regs->wIndexL));
1396         ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1397                                         | readl(&regs->wLengthL));
1398         writel(0, &regs->SetupRecv);
1399 
1400         nuke(&dev->ep[0], 0);
1401         dev->ep[0].stopped = 0;
1402         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1403                 dev->ep[0].is_in = 1;
1404                 dev->ep0state = EP0_IN;
1405                 /* detect early status stages */
1406                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1407         } else {
1408                 dev->ep[0].is_in = 0;
1409                 dev->ep0state = EP0_OUT;
1410 
1411                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1412                  * synchronize transfer restarts after bulk IN stalls.  data
1413                  * won't even enter the fifo until the halt is cleared.
1414                  */
1415                 switch (ctrl.bRequest) {
1416                 case USB_REQ_CLEAR_FEATURE:
1417                         switch (ctrl.bRequestType) {
1418                         case USB_RECIP_ENDPOINT:
1419                                 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1420                                 /* active endpoint */
1421                                 if (tmp > 3 ||
1422                                     (!dev->ep[tmp].ep.desc && tmp != 0))
1423                                         goto stall;
1424                                 if (ctrl.wIndex & cpu_to_le16(
1425                                                 USB_DIR_IN)) {
1426                                         if (!dev->ep[tmp].is_in)
1427                                                 goto stall;
1428                                 } else {
1429                                         if (dev->ep[tmp].is_in)
1430                                                 goto stall;
1431                                 }
1432                                 if (ctrl.wValue != cpu_to_le16(
1433                                                 USB_ENDPOINT_HALT))
1434                                         goto stall;
1435                                 if (tmp)
1436                                         goku_clear_halt(&dev->ep[tmp]);
1437 succeed:
1438                                 /* start ep0out status stage */
1439                                 writel(~(1<<0), &regs->EOP);
1440                                 dev->ep[0].stopped = 1;
1441                                 dev->ep0state = EP0_STATUS;
1442                                 return;
1443                         case USB_RECIP_DEVICE:
1444                                 /* device remote wakeup: always clear */
1445                                 if (ctrl.wValue != cpu_to_le16(1))
1446                                         goto stall;
1447                                 VDBG(dev, "clear dev remote wakeup\n");
1448                                 goto succeed;
1449                         case USB_RECIP_INTERFACE:
1450                                 goto stall;
1451                         default:                /* pass to gadget driver */
1452                                 break;
1453                         }
1454                         break;
1455                 default:
1456                         break;
1457                 }
1458         }
1459 
1460 #ifdef USB_TRACE
1461         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1462                 ctrl.bRequestType, ctrl.bRequest,
1463                 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1464                 le16_to_cpu(ctrl.wLength));
1465 #endif
1466 
1467         /* hw wants to know when we're configured (or not) */
1468         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1469                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1470         if (unlikely(dev->req_config))
1471                 dev->configured = (ctrl.wValue != cpu_to_le16(0));
1472 
1473         /* delegate everything to the gadget driver.
1474          * it may respond after this irq handler returns.
1475          */
1476         spin_unlock (&dev->lock);
1477         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1478         spin_lock (&dev->lock);
1479         if (unlikely(tmp < 0)) {
1480 stall:
1481 #ifdef USB_TRACE
1482                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1483                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1484 #endif
1485                 command(regs, COMMAND_STALL, 0);
1486                 dev->ep[0].stopped = 1;
1487                 dev->ep0state = EP0_STALL;
1488         }
1489 
1490         /* expect at least one data or status stage irq */
1491 }
1492 
1493 #define ACK(irqbit) { \
1494                 stat &= ~irqbit; \
1495                 writel(~irqbit, &regs->int_status); \
1496                 handled = 1; \
1497                 }
1498 
1499 static irqreturn_t goku_irq(int irq, void *_dev)
1500 {
1501         struct goku_udc                 *dev = _dev;
1502         struct goku_udc_regs __iomem    *regs = dev->regs;
1503         struct goku_ep                  *ep;
1504         u32                             stat, handled = 0;
1505         unsigned                        i, rescans = 5;
1506 
1507         spin_lock(&dev->lock);
1508 
1509 rescan:
1510         stat = readl(&regs->int_status) & dev->int_enable;
1511         if (!stat)
1512                 goto done;
1513         dev->irqs++;
1514 
1515         /* device-wide irqs */
1516         if (unlikely(stat & INT_DEVWIDE)) {
1517                 if (stat & INT_SYSERROR) {
1518                         ERROR(dev, "system error\n");
1519                         stop_activity(dev);
1520                         stat = 0;
1521                         handled = 1;
1522                         // FIXME have a neater way to prevent re-enumeration
1523                         dev->driver = NULL;
1524                         goto done;
1525                 }
1526                 if (stat & INT_PWRDETECT) {
1527                         writel(~stat, &regs->int_status);
1528                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1529                                 VDBG(dev, "connect\n");
1530                                 ep0_start(dev);
1531                         } else {
1532                                 DBG(dev, "disconnect\n");
1533                                 if (dev->gadget.speed == USB_SPEED_FULL)
1534                                         stop_activity(dev);
1535                                 dev->ep0state = EP0_DISCONNECT;
1536                                 dev->int_enable = INT_DEVWIDE;
1537                                 writel(dev->int_enable, &dev->regs->int_enable);
1538                         }
1539                         stat = 0;
1540                         handled = 1;
1541                         goto done;
1542                 }
1543                 if (stat & INT_SUSPEND) {
1544                         ACK(INT_SUSPEND);
1545                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1546                                 switch (dev->ep0state) {
1547                                 case EP0_DISCONNECT:
1548                                 case EP0_SUSPEND:
1549                                         goto pm_next;
1550                                 default:
1551                                         break;
1552                                 }
1553                                 DBG(dev, "USB suspend\n");
1554                                 dev->ep0state = EP0_SUSPEND;
1555                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1556                                                 && dev->driver
1557                                                 && dev->driver->suspend) {
1558                                         spin_unlock(&dev->lock);
1559                                         dev->driver->suspend(&dev->gadget);
1560                                         spin_lock(&dev->lock);
1561                                 }
1562                         } else {
1563                                 if (dev->ep0state != EP0_SUSPEND) {
1564                                         DBG(dev, "bogus USB resume %d\n",
1565                                                 dev->ep0state);
1566                                         goto pm_next;
1567                                 }
1568                                 DBG(dev, "USB resume\n");
1569                                 dev->ep0state = EP0_IDLE;
1570                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1571                                                 && dev->driver
1572                                                 && dev->driver->resume) {
1573                                         spin_unlock(&dev->lock);
1574                                         dev->driver->resume(&dev->gadget);
1575                                         spin_lock(&dev->lock);
1576                                 }
1577                         }
1578                 }
1579 pm_next:
1580                 if (stat & INT_USBRESET) {              /* hub reset done */
1581                         ACK(INT_USBRESET);
1582                         INFO(dev, "USB reset done, gadget %s\n",
1583                                 dev->driver->driver.name);
1584                 }
1585                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1586         }
1587 
1588         /* progress ep0 setup, data, or status stages.
1589          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1590          */
1591         if (stat & INT_SETUP) {
1592                 ACK(INT_SETUP);
1593                 dev->ep[0].irqs++;
1594                 ep0_setup(dev);
1595         }
1596         if (stat & INT_STATUSNAK) {
1597                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1598                 if (dev->ep0state == EP0_IN) {
1599                         ep = &dev->ep[0];
1600                         ep->irqs++;
1601                         nuke(ep, 0);
1602                         writel(~(1<<0), &regs->EOP);
1603                         dev->ep0state = EP0_STATUS;
1604                 }
1605         }
1606         if (stat & INT_ENDPOINT0) {
1607                 ACK(INT_ENDPOINT0);
1608                 ep = &dev->ep[0];
1609                 ep->irqs++;
1610                 pio_advance(ep);
1611         }
1612 
1613         /* dma completion */
1614         if (stat & INT_MSTRDEND) {      /* IN */
1615                 ACK(INT_MSTRDEND);
1616                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1617                 ep->irqs++;
1618                 dma_advance(dev, ep);
1619         }
1620         if (stat & INT_MSTWREND) {      /* OUT */
1621                 ACK(INT_MSTWREND);
1622                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1623                 ep->irqs++;
1624                 dma_advance(dev, ep);
1625         }
1626         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1627                 ACK(INT_MSTWRTMOUT);
1628                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1629                 ep->irqs++;
1630                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1631                 // reset dma? then dma_advance()
1632         }
1633 
1634         /* pio */
1635         for (i = 1; i < 4; i++) {
1636                 u32             tmp = INT_EPxDATASET(i);
1637 
1638                 if (!(stat & tmp))
1639                         continue;
1640                 ep = &dev->ep[i];
1641                 pio_advance(ep);
1642                 if (list_empty (&ep->queue))
1643                         pio_irq_disable(dev, regs, i);
1644                 stat &= ~tmp;
1645                 handled = 1;
1646                 ep->irqs++;
1647         }
1648 
1649         if (rescans--)
1650                 goto rescan;
1651 
1652 done:
1653         (void)readl(&regs->int_enable);
1654         spin_unlock(&dev->lock);
1655         if (stat)
1656                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1657                                 readl(&regs->int_status), dev->int_enable);
1658         return IRQ_RETVAL(handled);
1659 }
1660 
1661 #undef ACK
1662 
1663 /*-------------------------------------------------------------------------*/
1664 
1665 static void gadget_release(struct device *_dev)
1666 {
1667         struct goku_udc *dev = dev_get_drvdata(_dev);
1668 
1669         kfree(dev);
1670 }
1671 
1672 /* tear down the binding between this driver and the pci device */
1673 
1674 static void goku_remove(struct pci_dev *pdev)
1675 {
1676         struct goku_udc         *dev = pci_get_drvdata(pdev);
1677 
1678         DBG(dev, "%s\n", __func__);
1679 
1680         usb_del_gadget_udc(&dev->gadget);
1681 
1682         BUG_ON(dev->driver);
1683 
1684 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1685         remove_proc_entry(proc_node_name, NULL);
1686 #endif
1687         if (dev->regs)
1688                 udc_reset(dev);
1689         if (dev->got_irq)
1690                 free_irq(pdev->irq, dev);
1691         if (dev->regs)
1692                 iounmap(dev->regs);
1693         if (dev->got_region)
1694                 release_mem_region(pci_resource_start (pdev, 0),
1695                                 pci_resource_len (pdev, 0));
1696         if (dev->enabled)
1697                 pci_disable_device(pdev);
1698 
1699         dev->regs = NULL;
1700 
1701         INFO(dev, "unbind\n");
1702 }
1703 
1704 /* wrap this driver around the specified pci device, but
1705  * don't respond over USB until a gadget driver binds to us.
1706  */
1707 
1708 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1709 {
1710         struct goku_udc         *dev = NULL;
1711         unsigned long           resource, len;
1712         void __iomem            *base = NULL;
1713         int                     retval;
1714 
1715         if (!pdev->irq) {
1716                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1717                 retval = -ENODEV;
1718                 goto err;
1719         }
1720 
1721         /* alloc, and start init */
1722         dev = kzalloc (sizeof *dev, GFP_KERNEL);
1723         if (dev == NULL){
1724                 pr_debug("enomem %s\n", pci_name(pdev));
1725                 retval = -ENOMEM;
1726                 goto err;
1727         }
1728 
1729         spin_lock_init(&dev->lock);
1730         dev->pdev = pdev;
1731         dev->gadget.ops = &goku_ops;
1732         dev->gadget.max_speed = USB_SPEED_FULL;
1733 
1734         /* the "gadget" abstracts/virtualizes the controller */
1735         dev->gadget.name = driver_name;
1736 
1737         /* now all the pci goodies ... */
1738         retval = pci_enable_device(pdev);
1739         if (retval < 0) {
1740                 DBG(dev, "can't enable, %d\n", retval);
1741                 goto err;
1742         }
1743         dev->enabled = 1;
1744 
1745         resource = pci_resource_start(pdev, 0);
1746         len = pci_resource_len(pdev, 0);
1747         if (!request_mem_region(resource, len, driver_name)) {
1748                 DBG(dev, "controller already in use\n");
1749                 retval = -EBUSY;
1750                 goto err;
1751         }
1752         dev->got_region = 1;
1753 
1754         base = ioremap_nocache(resource, len);
1755         if (base == NULL) {
1756                 DBG(dev, "can't map memory\n");
1757                 retval = -EFAULT;
1758                 goto err;
1759         }
1760         dev->regs = (struct goku_udc_regs __iomem *) base;
1761 
1762         pci_set_drvdata(pdev, dev);
1763         INFO(dev, "%s\n", driver_desc);
1764         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1765         INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1766 
1767         /* init to known state, then setup irqs */
1768         udc_reset(dev);
1769         udc_reinit (dev);
1770         if (request_irq(pdev->irq, goku_irq, IRQF_SHARED,
1771                         driver_name, dev) != 0) {
1772                 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1773                 retval = -EBUSY;
1774                 goto err;
1775         }
1776         dev->got_irq = 1;
1777         if (use_dma)
1778                 pci_set_master(pdev);
1779 
1780 
1781 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1782         proc_create_data(proc_node_name, 0, NULL, &udc_proc_fops, dev);
1783 #endif
1784 
1785         retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
1786                         gadget_release);
1787         if (retval)
1788                 goto err;
1789 
1790         return 0;
1791 
1792 err:
1793         if (dev)
1794                 goku_remove (pdev);
1795         return retval;
1796 }
1797 
1798 
1799 /*-------------------------------------------------------------------------*/
1800 
1801 static const struct pci_device_id pci_ids[] = { {
1802         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1803         .class_mask =   ~0,
1804         .vendor =       0x102f,         /* Toshiba */
1805         .device =       0x0107,         /* this UDC */
1806         .subvendor =    PCI_ANY_ID,
1807         .subdevice =    PCI_ANY_ID,
1808 
1809 }, { /* end: all zeroes */ }
1810 };
1811 MODULE_DEVICE_TABLE (pci, pci_ids);
1812 
1813 static struct pci_driver goku_pci_driver = {
1814         .name =         (char *) driver_name,
1815         .id_table =     pci_ids,
1816 
1817         .probe =        goku_probe,
1818         .remove =       goku_remove,
1819 
1820         /* FIXME add power management support */
1821 };
1822 
1823 module_pci_driver(goku_pci_driver);
1824 

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