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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / usb / gadget / goku_udc.c
blob72f3e8082bdf23b8a892dcf2af0713b740da4e2a
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
75 /*-------------------------------------------------------------------------*/
76
77 static void nuke(struct goku_ep *, int status);
78
79 static inline void
80 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
81 {
82 writel(COMMAND_EP(epnum) | command, &regs->Command);
83 udelay(300);
84 }
85
86 static int
87 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
88 {
89 struct goku_udc *dev;
90 struct goku_ep *ep;
91 u32 mode;
92 u16 max;
93 unsigned long flags;
94
95 ep = container_of(_ep, struct goku_ep, ep);
96 if (!_ep || !desc || ep->desc
97 || desc->bDescriptorType != USB_DT_ENDPOINT)
98 return -EINVAL;
99 dev = ep->dev;
100 if (ep == &dev->ep[0])
101 return -EINVAL;
102 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
103 return -ESHUTDOWN;
104 if (ep->num != usb_endpoint_num(desc))
105 return -EINVAL;
106
107 switch (usb_endpoint_type(desc)) {
108 case USB_ENDPOINT_XFER_BULK:
109 case USB_ENDPOINT_XFER_INT:
110 break;
111 default:
112 return -EINVAL;
113 }
114
115 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
116 != EPxSTATUS_EP_INVALID)
117 return -EBUSY;
118
119 /* enabling the no-toggle interrupt mode would need an api hook */
120 mode = 0;
121 max = get_unaligned_le16(&desc->wMaxPacketSize);
122 switch (max) {
123 case 64: mode++;
124 case 32: mode++;
125 case 16: mode++;
126 case 8: mode <<= 3;
127 break;
128 default:
129 return -EINVAL;
130 }
131 mode |= 2 << 1; /* bulk, or intr-with-toggle */
132
133 /* ep1/ep2 dma direction is chosen early; it works in the other
134 * direction, with pio. be cautious with out-dma.
135 */
136 ep->is_in = usb_endpoint_dir_in(desc);
137 if (ep->is_in) {
138 mode |= 1;
139 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
140 } else {
141 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
142 if (ep->dma)
143 DBG(dev, "%s out-dma hides short packets\n",
144 ep->ep.name);
145 }
146
147 spin_lock_irqsave(&ep->dev->lock, flags);
148
149 /* ep1 and ep2 can do double buffering and/or dma */
150 if (ep->num < 3) {
151 struct goku_udc_regs __iomem *regs = ep->dev->regs;
152 u32 tmp;
153
154 /* double buffer except (for now) with pio in */
155 tmp = ((ep->dma || !ep->is_in)
156 ? 0x10 /* double buffered */
157 : 0x11 /* single buffer */
158 ) << ep->num;
159 tmp |= readl(&regs->EPxSingle);
160 writel(tmp, &regs->EPxSingle);
161
162 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
163 tmp |= readl(&regs->EPxBCS);
164 writel(tmp, &regs->EPxBCS);
165 }
166 writel(mode, ep->reg_mode);
167 command(ep->dev->regs, COMMAND_RESET, ep->num);
168 ep->ep.maxpacket = max;
169 ep->stopped = 0;
170 ep->desc = desc;
171 spin_unlock_irqrestore(&ep->dev->lock, flags);
172
173 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
174 ep->is_in ? "IN" : "OUT",
175 ep->dma ? "dma" : "pio",
176 max);
177
178 return 0;
179 }
180
181 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
182 {
183 struct goku_udc *dev = ep->dev;
184
185 if (regs) {
186 command(regs, COMMAND_INVALID, ep->num);
187 if (ep->num) {
188 if (ep->num == UDC_MSTWR_ENDPOINT)
189 dev->int_enable &= ~(INT_MSTWREND
190 |INT_MSTWRTMOUT);
191 else if (ep->num == UDC_MSTRD_ENDPOINT)
192 dev->int_enable &= ~INT_MSTRDEND;
193 dev->int_enable &= ~INT_EPxDATASET (ep->num);
194 } else
195 dev->int_enable &= ~INT_EP0;
196 writel(dev->int_enable, &regs->int_enable);
197 readl(&regs->int_enable);
198 if (ep->num < 3) {
199 struct goku_udc_regs __iomem *r = ep->dev->regs;
200 u32 tmp;
201
202 tmp = readl(&r->EPxSingle);
203 tmp &= ~(0x11 << ep->num);
204 writel(tmp, &r->EPxSingle);
205
206 tmp = readl(&r->EPxBCS);
207 tmp &= ~(0x11 << ep->num);
208 writel(tmp, &r->EPxBCS);
209 }
210 /* reset dma in case we're still using it */
211 if (ep->dma) {
212 u32 master;
213
214 master = readl(&regs->dma_master) & MST_RW_BITS;
215 if (ep->num == UDC_MSTWR_ENDPOINT) {
216 master &= ~MST_W_BITS;
217 master |= MST_WR_RESET;
218 } else {
219 master &= ~MST_R_BITS;
220 master |= MST_RD_RESET;
221 }
222 writel(master, &regs->dma_master);
223 }
224 }
225
226 ep->ep.maxpacket = MAX_FIFO_SIZE;
227 ep->desc = NULL;
228 ep->stopped = 1;
229 ep->irqs = 0;
230 ep->dma = 0;
231 }
232
233 static int goku_ep_disable(struct usb_ep *_ep)
234 {
235 struct goku_ep *ep;
236 struct goku_udc *dev;
237 unsigned long flags;
238
239 ep = container_of(_ep, struct goku_ep, ep);
240 if (!_ep || !ep->desc)
241 return -ENODEV;
242 dev = ep->dev;
243 if (dev->ep0state == EP0_SUSPEND)
244 return -EBUSY;
245
246 VDBG(dev, "disable %s\n", _ep->name);
247
248 spin_lock_irqsave(&dev->lock, flags);
249 nuke(ep, -ESHUTDOWN);
250 ep_reset(dev->regs, ep);
251 spin_unlock_irqrestore(&dev->lock, flags);
252
253 return 0;
254 }
255
256 /*-------------------------------------------------------------------------*/
257
258 static struct usb_request *
259 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
260 {
261 struct goku_request *req;
262
263 if (!_ep)
264 return NULL;
265 req = kzalloc(sizeof *req, gfp_flags);
266 if (!req)
267 return NULL;
268
269 req->req.dma = DMA_ADDR_INVALID;
270 INIT_LIST_HEAD(&req->queue);
271 return &req->req;
272 }
273
274 static void
275 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
276 {
277 struct goku_request *req;
278
279 if (!_ep || !_req)
280 return;
281
282 req = container_of(_req, struct goku_request, req);
283 WARN_ON(!list_empty(&req->queue));
284 kfree(req);
285 }
286
287 /*-------------------------------------------------------------------------*/
288
289 static void
290 done(struct goku_ep *ep, struct goku_request *req, int status)
291 {
292 struct goku_udc *dev;
293 unsigned stopped = ep->stopped;
294
295 list_del_init(&req->queue);
296
297 if (likely(req->req.status == -EINPROGRESS))
298 req->req.status = status;
299 else
300 status = req->req.status;
301
302 dev = ep->dev;
303 if (req->mapped) {
304 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
305 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
306 req->req.dma = DMA_ADDR_INVALID;
307 req->mapped = 0;
308 }
309
310 #ifndef USB_TRACE
311 if (status && status != -ESHUTDOWN)
312 #endif
313 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
314 ep->ep.name, &req->req, status,
315 req->req.actual, req->req.length);
316
317 /* don't modify queue heads during completion callback */
318 ep->stopped = 1;
319 spin_unlock(&dev->lock);
320 req->req.complete(&ep->ep, &req->req);
321 spin_lock(&dev->lock);
322 ep->stopped = stopped;
323 }
324
325 /*-------------------------------------------------------------------------*/
326
327 static inline int
328 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
329 {
330 unsigned length, count;
331
332 length = min(req->req.length - req->req.actual, max);
333 req->req.actual += length;
334
335 count = length;
336 while (likely(count--))
337 writel(*buf++, fifo);
338 return length;
339 }
340
341 // return: 0 = still running, 1 = completed, negative = errno
342 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
343 {
344 struct goku_udc *dev = ep->dev;
345 u32 tmp;
346 u8 *buf;
347 unsigned count;
348 int is_last;
349
350 tmp = readl(&dev->regs->DataSet);
351 buf = req->req.buf + req->req.actual;
352 prefetch(buf);
353
354 dev = ep->dev;
355 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
356 return -EL2HLT;
357
358 /* NOTE: just single-buffered PIO-IN for now. */
359 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
360 return 0;
361
362 /* clear our "packet available" irq */
363 if (ep->num != 0)
364 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
365
366 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
367
368 /* last packet often short (sometimes a zlp, especially on ep0) */
369 if (unlikely(count != ep->ep.maxpacket)) {
370 writel(~(1<<ep->num), &dev->regs->EOP);
371 if (ep->num == 0) {
372 dev->ep[0].stopped = 1;
373 dev->ep0state = EP0_STATUS;
374 }
375 is_last = 1;
376 } else {
377 if (likely(req->req.length != req->req.actual)
378 || req->req.zero)
379 is_last = 0;
380 else
381 is_last = 1;
382 }
383
384 /* requests complete when all IN data is in the FIFO,
385 * or sometimes later, if a zlp was needed.
386 */
387 if (is_last) {
388 done(ep, req, 0);
389 return 1;
390 }
391
392 return 0;
393 }
394
395 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
396 {
397 struct goku_udc_regs __iomem *regs;
398 u32 size, set;
399 u8 *buf;
400 unsigned bufferspace, is_short, dbuff;
401
402 regs = ep->dev->regs;
403 top:
404 buf = req->req.buf + req->req.actual;
405 prefetchw(buf);
406
407 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
408 return -EL2HLT;
409
410 dbuff = (ep->num == 1 || ep->num == 2);
411 do {
412 /* ack dataset irq matching the status we'll handle */
413 if (ep->num != 0)
414 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
415
416 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
417 size = readl(&regs->EPxSizeLA[ep->num]);
418 bufferspace = req->req.length - req->req.actual;
419
420 /* usually do nothing without an OUT packet */
421 if (likely(ep->num != 0 || bufferspace != 0)) {
422 if (unlikely(set == 0))
423 break;
424 /* use ep1/ep2 double-buffering for OUT */
425 if (!(size & PACKET_ACTIVE))
426 size = readl(&regs->EPxSizeLB[ep->num]);
427 if (!(size & PACKET_ACTIVE)) /* "can't happen" */
428 break;
429 size &= DATASIZE; /* EPxSizeH == 0 */
430
431 /* ep0out no-out-data case for set_config, etc */
432 } else
433 size = 0;
434
435 /* read all bytes from this packet */
436 req->req.actual += size;
437 is_short = (size < ep->ep.maxpacket);
438 #ifdef USB_TRACE
439 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
440 ep->ep.name, size, is_short ? "/S" : "",
441 req, req->req.actual, req->req.length);
442 #endif
443 while (likely(size-- != 0)) {
444 u8 byte = (u8) readl(ep->reg_fifo);
445
446 if (unlikely(bufferspace == 0)) {
447 /* this happens when the driver's buffer
448 * is smaller than what the host sent.
449 * discard the extra data in this packet.
450 */
451 if (req->req.status != -EOVERFLOW)
452 DBG(ep->dev, "%s overflow %u\n",
453 ep->ep.name, size);
454 req->req.status = -EOVERFLOW;
455 } else {
456 *buf++ = byte;
457 bufferspace--;
458 }
459 }
460
461 /* completion */
462 if (unlikely(is_short || req->req.actual == req->req.length)) {
463 if (unlikely(ep->num == 0)) {
464 /* non-control endpoints now usable? */
465 if (ep->dev->req_config)
466 writel(ep->dev->configured
467 ? USBSTATE_CONFIGURED
468 : 0,
469 &regs->UsbState);
470 /* ep0out status stage */
471 writel(~(1<<0), &regs->EOP);
472 ep->stopped = 1;
473 ep->dev->ep0state = EP0_STATUS;
474 }
475 done(ep, req, 0);
476
477 /* empty the second buffer asap */
478 if (dbuff && !list_empty(&ep->queue)) {
479 req = list_entry(ep->queue.next,
480 struct goku_request, queue);
481 goto top;
482 }
483 return 1;
484 }
485 } while (dbuff);
486 return 0;
487 }
488
489 static inline void
490 pio_irq_enable(struct goku_udc *dev,
491 struct goku_udc_regs __iomem *regs, int epnum)
492 {
493 dev->int_enable |= INT_EPxDATASET (epnum);
494 writel(dev->int_enable, &regs->int_enable);
495 /* write may still be posted */
496 }
497
498 static inline void
499 pio_irq_disable(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_advance(struct goku_ep *ep)
509 {
510 struct goku_request *req;
511
512 if (unlikely(list_empty (&ep->queue)))
513 return;
514 req = list_entry(ep->queue.next, struct goku_request, queue);
515 (ep->is_in ? write_fifo : read_fifo)(ep, req);
516 }
517
518
519 /*-------------------------------------------------------------------------*/
520
521 // return: 0 = q running, 1 = q stopped, negative = errno
522 static int start_dma(struct goku_ep *ep, struct goku_request *req)
523 {
524 struct goku_udc_regs __iomem *regs = ep->dev->regs;
525 u32 master;
526 u32 start = req->req.dma;
527 u32 end = start + req->req.length - 1;
528
529 master = readl(&regs->dma_master) & MST_RW_BITS;
530
531 /* re-init the bits affecting IN dma; careful with zlps */
532 if (likely(ep->is_in)) {
533 if (unlikely(master & MST_RD_ENA)) {
534 DBG (ep->dev, "start, IN active dma %03x!!\n",
535 master);
536 // return -EL2HLT;
537 }
538 writel(end, &regs->in_dma_end);
539 writel(start, &regs->in_dma_start);
540
541 master &= ~MST_R_BITS;
542 if (unlikely(req->req.length == 0))
543 master = MST_RD_ENA | MST_RD_EOPB;
544 else if ((req->req.length % ep->ep.maxpacket) != 0
545 || req->req.zero)
546 master = MST_RD_ENA | MST_EOPB_ENA;
547 else
548 master = MST_RD_ENA | MST_EOPB_DIS;
549
550 ep->dev->int_enable |= INT_MSTRDEND;
551
552 /* Goku DMA-OUT merges short packets, which plays poorly with
553 * protocols where short packets mark the transfer boundaries.
554 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
555 * ending transfers after 3 SOFs; we don't turn it on.
556 */
557 } else {
558 if (unlikely(master & MST_WR_ENA)) {
559 DBG (ep->dev, "start, OUT active dma %03x!!\n",
560 master);
561 // return -EL2HLT;
562 }
563 writel(end, &regs->out_dma_end);
564 writel(start, &regs->out_dma_start);
565
566 master &= ~MST_W_BITS;
567 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
568
569 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
570 }
571
572 writel(master, &regs->dma_master);
573 writel(ep->dev->int_enable, &regs->int_enable);
574 return 0;
575 }
576
577 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
578 {
579 struct goku_request *req;
580 struct goku_udc_regs __iomem *regs = ep->dev->regs;
581 u32 master;
582
583 master = readl(&regs->dma_master);
584
585 if (unlikely(list_empty(&ep->queue))) {
586 stop:
587 if (ep->is_in)
588 dev->int_enable &= ~INT_MSTRDEND;
589 else
590 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
591 writel(dev->int_enable, &regs->int_enable);
592 return;
593 }
594 req = list_entry(ep->queue.next, struct goku_request, queue);
595
596 /* normal hw dma completion (not abort) */
597 if (likely(ep->is_in)) {
598 if (unlikely(master & MST_RD_ENA))
599 return;
600 req->req.actual = readl(&regs->in_dma_current);
601 } else {
602 if (unlikely(master & MST_WR_ENA))
603 return;
604
605 /* hardware merges short packets, and also hides packet
606 * overruns. a partial packet MAY be in the fifo here.
607 */
608 req->req.actual = readl(&regs->out_dma_current);
609 }
610 req->req.actual -= req->req.dma;
611 req->req.actual++;
612
613 #ifdef USB_TRACE
614 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
615 ep->ep.name, ep->is_in ? "IN" : "OUT",
616 req->req.actual, req->req.length, req);
617 #endif
618 done(ep, req, 0);
619 if (list_empty(&ep->queue))
620 goto stop;
621 req = list_entry(ep->queue.next, struct goku_request, queue);
622 (void) start_dma(ep, req);
623 }
624
625 static void abort_dma(struct goku_ep *ep, int status)
626 {
627 struct goku_udc_regs __iomem *regs = ep->dev->regs;
628 struct goku_request *req;
629 u32 curr, master;
630
631 /* NAK future host requests, hoping the implicit delay lets the
632 * dma engine finish reading (or writing) its latest packet and
633 * empty the dma buffer (up to 16 bytes).
634 *
635 * This avoids needing to clean up a partial packet in the fifo;
636 * we can't do that for IN without side effects to HALT and TOGGLE.
637 */
638 command(regs, COMMAND_FIFO_DISABLE, ep->num);
639 req = list_entry(ep->queue.next, struct goku_request, queue);
640 master = readl(&regs->dma_master) & MST_RW_BITS;
641
642 if (ep->is_in) {
643 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
644 goto finished;
645 curr = readl(&regs->in_dma_current);
646
647 writel(curr, &regs->in_dma_end);
648 writel(curr, &regs->in_dma_start);
649
650 master &= ~MST_R_BITS;
651 master |= MST_RD_RESET;
652 writel(master, &regs->dma_master);
653
654 if (readl(&regs->dma_master) & MST_RD_ENA)
655 DBG(ep->dev, "IN dma active after reset!\n");
656
657 } else {
658 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
659 goto finished;
660 curr = readl(&regs->out_dma_current);
661
662 writel(curr, &regs->out_dma_end);
663 writel(curr, &regs->out_dma_start);
664
665 master &= ~MST_W_BITS;
666 master |= MST_WR_RESET;
667 writel(master, &regs->dma_master);
668
669 if (readl(&regs->dma_master) & MST_WR_ENA)
670 DBG(ep->dev, "OUT dma active after reset!\n");
671 }
672 req->req.actual = (curr - req->req.dma) + 1;
673 req->req.status = status;
674
675 VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name,
676 ep->is_in ? "IN" : "OUT",
677 req->req.actual, req->req.length);
678
679 command(regs, COMMAND_FIFO_ENABLE, ep->num);
680
681 return;
682
683 finished:
684 /* dma already completed; no abort needed */
685 command(regs, COMMAND_FIFO_ENABLE, ep->num);
686 req->req.actual = req->req.length;
687 req->req.status = 0;
688 }
689
690 /*-------------------------------------------------------------------------*/
691
692 static int
693 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
694 {
695 struct goku_request *req;
696 struct goku_ep *ep;
697 struct goku_udc *dev;
698 unsigned long flags;
699 int status;
700
701 /* always require a cpu-view buffer so pio works */
702 req = container_of(_req, struct goku_request, req);
703 if (unlikely(!_req || !_req->complete
704 || !_req->buf || !list_empty(&req->queue)))
705 return -EINVAL;
706 ep = container_of(_ep, struct goku_ep, ep);
707 if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
708 return -EINVAL;
709 dev = ep->dev;
710 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
711 return -ESHUTDOWN;
712
713 /* can't touch registers when suspended */
714 if (dev->ep0state == EP0_SUSPEND)
715 return -EBUSY;
716
717 /* set up dma mapping in case the caller didn't */
718 if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
719 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
720 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
721 req->mapped = 1;
722 }
723
724 #ifdef USB_TRACE
725 VDBG(dev, "%s queue req %p, len %u buf %p\n",
726 _ep->name, _req, _req->length, _req->buf);
727 #endif
728
729 spin_lock_irqsave(&dev->lock, flags);
730
731 _req->status = -EINPROGRESS;
732 _req->actual = 0;
733
734 /* for ep0 IN without premature status, zlp is required and
735 * writing EOP starts the status stage (OUT).
736 */
737 if (unlikely(ep->num == 0 && ep->is_in))
738 _req->zero = 1;
739
740 /* kickstart this i/o queue? */
741 status = 0;
742 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
743 /* dma: done after dma completion IRQ (or error)
744 * pio: done after last fifo operation
745 */
746 if (ep->dma)
747 status = start_dma(ep, req);
748 else
749 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
750
751 if (unlikely(status != 0)) {
752 if (status > 0)
753 status = 0;
754 req = NULL;
755 }
756
757 } /* else pio or dma irq handler advances the queue. */
758
759 if (likely(req != 0))
760 list_add_tail(&req->queue, &ep->queue);
761
762 if (likely(!list_empty(&ep->queue))
763 && likely(ep->num != 0)
764 && !ep->dma
765 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
766 pio_irq_enable(dev, dev->regs, ep->num);
767
768 spin_unlock_irqrestore(&dev->lock, flags);
769
770 /* pci writes may still be posted */
771 return status;
772 }
773
774 /* dequeue ALL requests */
775 static void nuke(struct goku_ep *ep, int status)
776 {
777 struct goku_request *req;
778
779 ep->stopped = 1;
780 if (list_empty(&ep->queue))
781 return;
782 if (ep->dma)
783 abort_dma(ep, status);
784 while (!list_empty(&ep->queue)) {
785 req = list_entry(ep->queue.next, struct goku_request, queue);
786 done(ep, req, status);
787 }
788 }
789
790 /* dequeue JUST ONE request */
791 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
792 {
793 struct goku_request *req;
794 struct goku_ep *ep;
795 struct goku_udc *dev;
796 unsigned long flags;
797
798 ep = container_of(_ep, struct goku_ep, ep);
799 if (!_ep || !_req || (!ep->desc && ep->num != 0))
800 return -EINVAL;
801 dev = ep->dev;
802 if (!dev->driver)
803 return -ESHUTDOWN;
804
805 /* we can't touch (dma) registers when suspended */
806 if (dev->ep0state == EP0_SUSPEND)
807 return -EBUSY;
808
809 VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name,
810 ep->is_in ? "IN" : "OUT",
811 ep->dma ? "dma" : "pio",
812 _req);
813
814 spin_lock_irqsave(&dev->lock, flags);
815
816 /* make sure it's actually queued on this endpoint */
817 list_for_each_entry (req, &ep->queue, queue) {
818 if (&req->req == _req)
819 break;
820 }
821 if (&req->req != _req) {
822 spin_unlock_irqrestore (&dev->lock, flags);
823 return -EINVAL;
824 }
825
826 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
827 abort_dma(ep, -ECONNRESET);
828 done(ep, req, -ECONNRESET);
829 dma_advance(dev, ep);
830 } else if (!list_empty(&req->queue))
831 done(ep, req, -ECONNRESET);
832 else
833 req = NULL;
834 spin_unlock_irqrestore(&dev->lock, flags);
835
836 return req ? 0 : -EOPNOTSUPP;
837 }
838
839 /*-------------------------------------------------------------------------*/
840
841 static void goku_clear_halt(struct goku_ep *ep)
842 {
843 // assert (ep->num !=0)
844 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
845 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
846 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
847 if (ep->stopped) {
848 ep->stopped = 0;
849 if (ep->dma) {
850 struct goku_request *req;
851
852 if (list_empty(&ep->queue))
853 return;
854 req = list_entry(ep->queue.next, struct goku_request,
855 queue);
856 (void) start_dma(ep, req);
857 } else
858 pio_advance(ep);
859 }
860 }
861
862 static int goku_set_halt(struct usb_ep *_ep, int value)
863 {
864 struct goku_ep *ep;
865 unsigned long flags;
866 int retval = 0;
867
868 if (!_ep)
869 return -ENODEV;
870 ep = container_of (_ep, struct goku_ep, ep);
871
872 if (ep->num == 0) {
873 if (value) {
874 ep->dev->ep0state = EP0_STALL;
875 ep->dev->ep[0].stopped = 1;
876 } else
877 return -EINVAL;
878
879 /* don't change EPxSTATUS_EP_INVALID to READY */
880 } else if (!ep->desc) {
881 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
882 return -EINVAL;
883 }
884
885 spin_lock_irqsave(&ep->dev->lock, flags);
886 if (!list_empty(&ep->queue))
887 retval = -EAGAIN;
888 else if (ep->is_in && value
889 /* data in (either) packet buffer? */
890 && (readl(&ep->dev->regs->DataSet)
891 & DATASET_AB(ep->num)))
892 retval = -EAGAIN;
893 else if (!value)
894 goku_clear_halt(ep);
895 else {
896 ep->stopped = 1;
897 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
898 command(ep->dev->regs, COMMAND_STALL, ep->num);
899 readl(ep->reg_status);
900 }
901 spin_unlock_irqrestore(&ep->dev->lock, flags);
902 return retval;
903 }
904
905 static int goku_fifo_status(struct usb_ep *_ep)
906 {
907 struct goku_ep *ep;
908 struct goku_udc_regs __iomem *regs;
909 u32 size;
910
911 if (!_ep)
912 return -ENODEV;
913 ep = container_of(_ep, struct goku_ep, ep);
914
915 /* size is only reported sanely for OUT */
916 if (ep->is_in)
917 return -EOPNOTSUPP;
918
919 /* ignores 16-byte dma buffer; SizeH == 0 */
920 regs = ep->dev->regs;
921 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
922 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
923 VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size);
924 return size;
925 }
926
927 static void goku_fifo_flush(struct usb_ep *_ep)
928 {
929 struct goku_ep *ep;
930 struct goku_udc_regs __iomem *regs;
931 u32 size;
932
933 if (!_ep)
934 return;
935 ep = container_of(_ep, struct goku_ep, ep);
936 VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name);
937
938 /* don't change EPxSTATUS_EP_INVALID to READY */
939 if (!ep->desc && ep->num != 0) {
940 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
941 return;
942 }
943
944 regs = ep->dev->regs;
945 size = readl(&regs->EPxSizeLA[ep->num]);
946 size &= DATASIZE;
947
948 /* Non-desirable behavior: FIFO_CLEAR also clears the
949 * endpoint halt feature. For OUT, we _could_ just read
950 * the bytes out (PIO, if !ep->dma); for in, no choice.
951 */
952 if (size)
953 command(regs, COMMAND_FIFO_CLEAR, ep->num);
954 }
955
956 static struct usb_ep_ops goku_ep_ops = {
957 .enable = goku_ep_enable,
958 .disable = goku_ep_disable,
959
960 .alloc_request = goku_alloc_request,
961 .free_request = goku_free_request,
962
963 .queue = goku_queue,
964 .dequeue = goku_dequeue,
965
966 .set_halt = goku_set_halt,
967 .fifo_status = goku_fifo_status,
968 .fifo_flush = goku_fifo_flush,
969 };
970
971 /*-------------------------------------------------------------------------*/
972
973 static int goku_get_frame(struct usb_gadget *_gadget)
974 {
975 return -EOPNOTSUPP;
976 }
977
978 static const struct usb_gadget_ops goku_ops = {
979 .get_frame = goku_get_frame,
980 // no remote wakeup
981 // not selfpowered
982 };
983
984 /*-------------------------------------------------------------------------*/
985
986 static inline char *dmastr(void)
987 {
988 if (use_dma == 0)
989 return "(dma disabled)";
990 else if (use_dma == 2)
991 return "(dma IN and OUT)";
992 else
993 return "(dma IN)";
994 }
995
996 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
997
998 static const char proc_node_name [] = "driver/udc";
999
1000 #define FOURBITS "%s%s%s%s"
1001 #define EIGHTBITS FOURBITS FOURBITS
1002
1003 static void
1004 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1005 {
1006 int t;
1007
1008 /* int_status is the same format ... */
1009 t = scnprintf(*next, *size,
1010 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1011 label, mask,
1012 (mask & INT_PWRDETECT) ? " power" : "",
1013 (mask & INT_SYSERROR) ? " sys" : "",
1014 (mask & INT_MSTRDEND) ? " in-dma" : "",
1015 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1016
1017 (mask & INT_MSTWREND) ? " out-dma" : "",
1018 (mask & INT_MSTWRSET) ? " wrset" : "",
1019 (mask & INT_ERR) ? " err" : "",
1020 (mask & INT_SOF) ? " sof" : "",
1021
1022 (mask & INT_EP3NAK) ? " ep3nak" : "",
1023 (mask & INT_EP2NAK) ? " ep2nak" : "",
1024 (mask & INT_EP1NAK) ? " ep1nak" : "",
1025 (mask & INT_EP3DATASET) ? " ep3" : "",
1026
1027 (mask & INT_EP2DATASET) ? " ep2" : "",
1028 (mask & INT_EP1DATASET) ? " ep1" : "",
1029 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1030 (mask & INT_STATUS) ? " ep0status" : "",
1031
1032 (mask & INT_SETUP) ? " setup" : "",
1033 (mask & INT_ENDPOINT0) ? " ep0" : "",
1034 (mask & INT_USBRESET) ? " reset" : "",
1035 (mask & INT_SUSPEND) ? " suspend" : "");
1036 *size -= t;
1037 *next += t;
1038 }
1039
1040
1041 static int
1042 udc_proc_read(char *buffer, char **start, off_t off, int count,
1043 int *eof, void *_dev)
1044 {
1045 char *buf = buffer;
1046 struct goku_udc *dev = _dev;
1047 struct goku_udc_regs __iomem *regs = dev->regs;
1048 char *next = buf;
1049 unsigned size = count;
1050 unsigned long flags;
1051 int i, t, is_usb_connected;
1052 u32 tmp;
1053
1054 if (off != 0)
1055 return 0;
1056
1057 local_irq_save(flags);
1058
1059 /* basic device status */
1060 tmp = readl(&regs->power_detect);
1061 is_usb_connected = tmp & PW_DETECT;
1062 t = scnprintf(next, size,
1063 "%s - %s\n"
1064 "%s version: %s %s\n"
1065 "Gadget driver: %s\n"
1066 "Host %s, %s\n"
1067 "\n",
1068 pci_name(dev->pdev), driver_desc,
1069 driver_name, DRIVER_VERSION, dmastr(),
1070 dev->driver ? dev->driver->driver.name : "(none)",
1071 is_usb_connected
1072 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1073 : "disconnected",
1074 ({char *state;
1075 switch(dev->ep0state){
1076 case EP0_DISCONNECT: state = "ep0_disconnect"; break;
1077 case EP0_IDLE: state = "ep0_idle"; break;
1078 case EP0_IN: state = "ep0_in"; break;
1079 case EP0_OUT: state = "ep0_out"; break;
1080 case EP0_STATUS: state = "ep0_status"; break;
1081 case EP0_STALL: state = "ep0_stall"; break;
1082 case EP0_SUSPEND: state = "ep0_suspend"; break;
1083 default: state = "ep0_?"; break;
1084 } state; })
1085 );
1086 size -= t;
1087 next += t;
1088
1089 dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1090 dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1091
1092 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1093 goto done;
1094
1095 /* registers for (active) device and ep0 */
1096 t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1097 "single.bcs %02x.%02x state %x addr %u\n",
1098 dev->irqs, readl(&regs->DataSet),
1099 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1100 readl(&regs->UsbState),
1101 readl(&regs->address));
1102 size -= t;
1103 next += t;
1104
1105 tmp = readl(&regs->dma_master);
1106 t = scnprintf(next, size,
1107 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1108 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1109 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1110 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1111 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1112
1113 (tmp & MST_RD_EOPB) ? " eopb" : "",
1114 (tmp & MST_RD_RESET) ? " in_reset" : "",
1115 (tmp & MST_WR_RESET) ? " out_reset" : "",
1116 (tmp & MST_RD_ENA) ? " IN" : "",
1117
1118 (tmp & MST_WR_ENA) ? " OUT" : "",
1119 (tmp & MST_CONNECTION)
1120 ? "ep1in/ep2out"
1121 : "ep1out/ep2in");
1122 size -= t;
1123 next += t;
1124
1125 /* dump endpoint queues */
1126 for (i = 0; i < 4; i++) {
1127 struct goku_ep *ep = &dev->ep [i];
1128 struct goku_request *req;
1129
1130 if (i && !ep->desc)
1131 continue;
1132
1133 tmp = readl(ep->reg_status);
1134 t = scnprintf(next, size,
1135 "%s %s max %u %s, irqs %lu, "
1136 "status %02x (%s) " FOURBITS "\n",
1137 ep->ep.name,
1138 ep->is_in ? "in" : "out",
1139 ep->ep.maxpacket,
1140 ep->dma ? "dma" : "pio",
1141 ep->irqs,
1142 tmp, ({ char *s;
1143 switch (tmp & EPxSTATUS_EP_MASK) {
1144 case EPxSTATUS_EP_READY:
1145 s = "ready"; break;
1146 case EPxSTATUS_EP_DATAIN:
1147 s = "packet"; break;
1148 case EPxSTATUS_EP_FULL:
1149 s = "full"; break;
1150 case EPxSTATUS_EP_TX_ERR: // host will retry
1151 s = "tx_err"; break;
1152 case EPxSTATUS_EP_RX_ERR:
1153 s = "rx_err"; break;
1154 case EPxSTATUS_EP_BUSY: /* ep0 only */
1155 s = "busy"; break;
1156 case EPxSTATUS_EP_STALL:
1157 s = "stall"; break;
1158 case EPxSTATUS_EP_INVALID: // these "can't happen"
1159 s = "invalid"; break;
1160 default:
1161 s = "?"; break;
1162 }; s; }),
1163 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1164 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1165 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1166 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1167 );
1168 if (t <= 0 || t > size)
1169 goto done;
1170 size -= t;
1171 next += t;
1172
1173 if (list_empty(&ep->queue)) {
1174 t = scnprintf(next, size, "\t(nothing queued)\n");
1175 if (t <= 0 || t > size)
1176 goto done;
1177 size -= t;
1178 next += t;
1179 continue;
1180 }
1181 list_for_each_entry(req, &ep->queue, queue) {
1182 if (ep->dma && req->queue.prev == &ep->queue) {
1183 if (i == UDC_MSTRD_ENDPOINT)
1184 tmp = readl(&regs->in_dma_current);
1185 else
1186 tmp = readl(&regs->out_dma_current);
1187 tmp -= req->req.dma;
1188 tmp++;
1189 } else
1190 tmp = req->req.actual;
1191
1192 t = scnprintf(next, size,
1193 "\treq %p len %u/%u buf %p\n",
1194 &req->req, tmp, req->req.length,
1195 req->req.buf);
1196 if (t <= 0 || t > size)
1197 goto done;
1198 size -= t;
1199 next += t;
1200 }
1201 }
1202
1203 done:
1204 local_irq_restore(flags);
1205 *eof = 1;
1206 return count - size;
1207 }
1208
1209 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1210
1211 /*-------------------------------------------------------------------------*/
1212
1213 static void udc_reinit (struct goku_udc *dev)
1214 {
1215 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1216
1217 unsigned i;
1218
1219 INIT_LIST_HEAD (&dev->gadget.ep_list);
1220 dev->gadget.ep0 = &dev->ep [0].ep;
1221 dev->gadget.speed = USB_SPEED_UNKNOWN;
1222 dev->ep0state = EP0_DISCONNECT;
1223 dev->irqs = 0;
1224
1225 for (i = 0; i < 4; i++) {
1226 struct goku_ep *ep = &dev->ep[i];
1227
1228 ep->num = i;
1229 ep->ep.name = names[i];
1230 ep->reg_fifo = &dev->regs->ep_fifo [i];
1231 ep->reg_status = &dev->regs->ep_status [i];
1232 ep->reg_mode = &dev->regs->ep_mode[i];
1233
1234 ep->ep.ops = &goku_ep_ops;
1235 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1236 ep->dev = dev;
1237 INIT_LIST_HEAD (&ep->queue);
1238
1239 ep_reset(NULL, ep);
1240 }
1241
1242 dev->ep[0].reg_mode = NULL;
1243 dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1244 list_del_init (&dev->ep[0].ep.ep_list);
1245 }
1246
1247 static void udc_reset(struct goku_udc *dev)
1248 {
1249 struct goku_udc_regs __iomem *regs = dev->regs;
1250
1251 writel(0, &regs->power_detect);
1252 writel(0, &regs->int_enable);
1253 readl(&regs->int_enable);
1254 dev->int_enable = 0;
1255
1256 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1257 * don't let INT_PWRDETECT sequence begin
1258 */
1259 udelay(250);
1260 writel(PW_RESETB, &regs->power_detect);
1261 readl(&regs->int_enable);
1262 }
1263
1264 static void ep0_start(struct goku_udc *dev)
1265 {
1266 struct goku_udc_regs __iomem *regs = dev->regs;
1267 unsigned i;
1268
1269 VDBG(dev, "%s\n", __func__);
1270
1271 udc_reset(dev);
1272 udc_reinit (dev);
1273 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1274
1275 /* hw handles set_address, set_feature, get_status; maybe more */
1276 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1277 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1278 | G_REQMODE_GET_DESC
1279 | G_REQMODE_CLEAR_FEAT
1280 , &regs->reqmode);
1281
1282 for (i = 0; i < 4; i++)
1283 dev->ep[i].irqs = 0;
1284
1285 /* can't modify descriptors after writing UsbReady */
1286 for (i = 0; i < DESC_LEN; i++)
1287 writel(0, &regs->descriptors[i]);
1288 writel(0, &regs->UsbReady);
1289
1290 /* expect ep0 requests when the host drops reset */
1291 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1292 dev->int_enable = INT_DEVWIDE | INT_EP0;
1293 writel(dev->int_enable, &dev->regs->int_enable);
1294 readl(&regs->int_enable);
1295 dev->gadget.speed = USB_SPEED_FULL;
1296 dev->ep0state = EP0_IDLE;
1297 }
1298
1299 static void udc_enable(struct goku_udc *dev)
1300 {
1301 /* start enumeration now, or after power detect irq */
1302 if (readl(&dev->regs->power_detect) & PW_DETECT)
1303 ep0_start(dev);
1304 else {
1305 DBG(dev, "%s\n", __func__);
1306 dev->int_enable = INT_PWRDETECT;
1307 writel(dev->int_enable, &dev->regs->int_enable);
1308 }
1309 }
1310
1311 /*-------------------------------------------------------------------------*/
1312
1313 /* keeping it simple:
1314 * - one bus driver, initted first;
1315 * - one function driver, initted second
1316 */
1317
1318 static struct goku_udc *the_controller;
1319
1320 /* when a driver is successfully registered, it will receive
1321 * control requests including set_configuration(), which enables
1322 * non-control requests. then usb traffic follows until a
1323 * disconnect is reported. then a host may connect again, or
1324 * the driver might get unbound.
1325 */
1326 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1327 {
1328 struct goku_udc *dev = the_controller;
1329 int retval;
1330
1331 if (!driver
1332 || driver->speed < USB_SPEED_FULL
1333 || !driver->bind
1334 || !driver->disconnect
1335 || !driver->setup)
1336 return -EINVAL;
1337 if (!dev)
1338 return -ENODEV;
1339 if (dev->driver)
1340 return -EBUSY;
1341
1342 /* hook up the driver */
1343 driver->driver.bus = NULL;
1344 dev->driver = driver;
1345 dev->gadget.dev.driver = &driver->driver;
1346 retval = driver->bind(&dev->gadget);
1347 if (retval) {
1348 DBG(dev, "bind to driver %s --> error %d\n",
1349 driver->driver.name, retval);
1350 dev->driver = NULL;
1351 dev->gadget.dev.driver = NULL;
1352 return retval;
1353 }
1354
1355 /* then enable host detection and ep0; and we're ready
1356 * for set_configuration as well as eventual disconnect.
1357 */
1358 udc_enable(dev);
1359
1360 DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1361 return 0;
1362 }
1363 EXPORT_SYMBOL(usb_gadget_register_driver);
1364
1365 static void
1366 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1367 {
1368 unsigned i;
1369
1370 DBG (dev, "%s\n", __func__);
1371
1372 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1373 driver = NULL;
1374
1375 /* disconnect gadget driver after quiesceing hw and the driver */
1376 udc_reset (dev);
1377 for (i = 0; i < 4; i++)
1378 nuke(&dev->ep [i], -ESHUTDOWN);
1379 if (driver) {
1380 spin_unlock(&dev->lock);
1381 driver->disconnect(&dev->gadget);
1382 spin_lock(&dev->lock);
1383 }
1384
1385 if (dev->driver)
1386 udc_enable(dev);
1387 }
1388
1389 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1390 {
1391 struct goku_udc *dev = the_controller;
1392 unsigned long flags;
1393
1394 if (!dev)
1395 return -ENODEV;
1396 if (!driver || driver != dev->driver || !driver->unbind)
1397 return -EINVAL;
1398
1399 spin_lock_irqsave(&dev->lock, flags);
1400 dev->driver = NULL;
1401 stop_activity(dev, driver);
1402 spin_unlock_irqrestore(&dev->lock, flags);
1403
1404 driver->unbind(&dev->gadget);
1405 dev->gadget.dev.driver = NULL;
1406
1407 DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1408 return 0;
1409 }
1410 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1411
1412
1413 /*-------------------------------------------------------------------------*/
1414
1415 static void ep0_setup(struct goku_udc *dev)
1416 {
1417 struct goku_udc_regs __iomem *regs = dev->regs;
1418 struct usb_ctrlrequest ctrl;
1419 int tmp;
1420
1421 /* read SETUP packet and enter DATA stage */
1422 ctrl.bRequestType = readl(&regs->bRequestType);
1423 ctrl.bRequest = readl(&regs->bRequest);
1424 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1425 | readl(&regs->wValueL));
1426 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1427 | readl(&regs->wIndexL));
1428 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1429 | readl(&regs->wLengthL));
1430 writel(0, &regs->SetupRecv);
1431
1432 nuke(&dev->ep[0], 0);
1433 dev->ep[0].stopped = 0;
1434 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1435 dev->ep[0].is_in = 1;
1436 dev->ep0state = EP0_IN;
1437 /* detect early status stages */
1438 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1439 } else {
1440 dev->ep[0].is_in = 0;
1441 dev->ep0state = EP0_OUT;
1442
1443 /* NOTE: CLEAR_FEATURE is done in software so that we can
1444 * synchronize transfer restarts after bulk IN stalls. data
1445 * won't even enter the fifo until the halt is cleared.
1446 */
1447 switch (ctrl.bRequest) {
1448 case USB_REQ_CLEAR_FEATURE:
1449 switch (ctrl.bRequestType) {
1450 case USB_RECIP_ENDPOINT:
1451 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1452 /* active endpoint */
1453 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1454 goto stall;
1455 if (ctrl.wIndex & cpu_to_le16(
1456 USB_DIR_IN)) {
1457 if (!dev->ep[tmp].is_in)
1458 goto stall;
1459 } else {
1460 if (dev->ep[tmp].is_in)
1461 goto stall;
1462 }
1463 if (ctrl.wValue != cpu_to_le16(
1464 USB_ENDPOINT_HALT))
1465 goto stall;
1466 if (tmp)
1467 goku_clear_halt(&dev->ep[tmp]);
1468 succeed:
1469 /* start ep0out status stage */
1470 writel(~(1<<0), &regs->EOP);
1471 dev->ep[0].stopped = 1;
1472 dev->ep0state = EP0_STATUS;
1473 return;
1474 case USB_RECIP_DEVICE:
1475 /* device remote wakeup: always clear */
1476 if (ctrl.wValue != cpu_to_le16(1))
1477 goto stall;
1478 VDBG(dev, "clear dev remote wakeup\n");
1479 goto succeed;
1480 case USB_RECIP_INTERFACE:
1481 goto stall;
1482 default: /* pass to gadget driver */
1483 break;
1484 }
1485 break;
1486 default:
1487 break;
1488 }
1489 }
1490
1491 #ifdef USB_TRACE
1492 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1493 ctrl.bRequestType, ctrl.bRequest,
1494 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1495 le16_to_cpu(ctrl.wLength));
1496 #endif
1497
1498 /* hw wants to know when we're configured (or not) */
1499 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1500 && ctrl.bRequestType == USB_RECIP_DEVICE);
1501 if (unlikely(dev->req_config))
1502 dev->configured = (ctrl.wValue != cpu_to_le16(0));
1503
1504 /* delegate everything to the gadget driver.
1505 * it may respond after this irq handler returns.
1506 */
1507 spin_unlock (&dev->lock);
1508 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1509 spin_lock (&dev->lock);
1510 if (unlikely(tmp < 0)) {
1511 stall:
1512 #ifdef USB_TRACE
1513 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1514 ctrl.bRequestType, ctrl.bRequest, tmp);
1515 #endif
1516 command(regs, COMMAND_STALL, 0);
1517 dev->ep[0].stopped = 1;
1518 dev->ep0state = EP0_STALL;
1519 }
1520
1521 /* expect at least one data or status stage irq */
1522 }
1523
1524 #define ACK(irqbit) { \
1525 stat &= ~irqbit; \
1526 writel(~irqbit, &regs->int_status); \
1527 handled = 1; \
1528 }
1529
1530 static irqreturn_t goku_irq(int irq, void *_dev)
1531 {
1532 struct goku_udc *dev = _dev;
1533 struct goku_udc_regs __iomem *regs = dev->regs;
1534 struct goku_ep *ep;
1535 u32 stat, handled = 0;
1536 unsigned i, rescans = 5;
1537
1538 spin_lock(&dev->lock);
1539
1540 rescan:
1541 stat = readl(&regs->int_status) & dev->int_enable;
1542 if (!stat)
1543 goto done;
1544 dev->irqs++;
1545
1546 /* device-wide irqs */
1547 if (unlikely(stat & INT_DEVWIDE)) {
1548 if (stat & INT_SYSERROR) {
1549 ERROR(dev, "system error\n");
1550 stop_activity(dev, dev->driver);
1551 stat = 0;
1552 handled = 1;
1553 dev->driver = NULL;
1554 goto done;
1555 }
1556 if (stat & INT_PWRDETECT) {
1557 writel(~stat, &regs->int_status);
1558 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1559 VDBG(dev, "connect\n");
1560 ep0_start(dev);
1561 } else {
1562 DBG(dev, "disconnect\n");
1563 if (dev->gadget.speed == USB_SPEED_FULL)
1564 stop_activity(dev, dev->driver);
1565 dev->ep0state = EP0_DISCONNECT;
1566 dev->int_enable = INT_DEVWIDE;
1567 writel(dev->int_enable, &dev->regs->int_enable);
1568 }
1569 stat = 0;
1570 handled = 1;
1571 goto done;
1572 }
1573 if (stat & INT_SUSPEND) {
1574 ACK(INT_SUSPEND);
1575 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1576 switch (dev->ep0state) {
1577 case EP0_DISCONNECT:
1578 case EP0_SUSPEND:
1579 goto pm_next;
1580 default:
1581 break;
1582 }
1583 DBG(dev, "USB suspend\n");
1584 dev->ep0state = EP0_SUSPEND;
1585 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1586 && dev->driver
1587 && dev->driver->suspend) {
1588 spin_unlock(&dev->lock);
1589 dev->driver->suspend(&dev->gadget);
1590 spin_lock(&dev->lock);
1591 }
1592 } else {
1593 if (dev->ep0state != EP0_SUSPEND) {
1594 DBG(dev, "bogus USB resume %d\n",
1595 dev->ep0state);
1596 goto pm_next;
1597 }
1598 DBG(dev, "USB resume\n");
1599 dev->ep0state = EP0_IDLE;
1600 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1601 && dev->driver
1602 && dev->driver->resume) {
1603 spin_unlock(&dev->lock);
1604 dev->driver->resume(&dev->gadget);
1605 spin_lock(&dev->lock);
1606 }
1607 }
1608 }
1609 pm_next:
1610 if (stat & INT_USBRESET) { /* hub reset done */
1611 ACK(INT_USBRESET);
1612 INFO(dev, "USB reset done, gadget %s\n",
1613 dev->driver->driver.name);
1614 }
1615 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1616 }
1617
1618 /* progress ep0 setup, data, or status stages.
1619 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1620 */
1621 if (stat & INT_SETUP) {
1622 ACK(INT_SETUP);
1623 dev->ep[0].irqs++;
1624 ep0_setup(dev);
1625 }
1626 if (stat & INT_STATUSNAK) {
1627 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1628 if (dev->ep0state == EP0_IN) {
1629 ep = &dev->ep[0];
1630 ep->irqs++;
1631 nuke(ep, 0);
1632 writel(~(1<<0), &regs->EOP);
1633 dev->ep0state = EP0_STATUS;
1634 }
1635 }
1636 if (stat & INT_ENDPOINT0) {
1637 ACK(INT_ENDPOINT0);
1638 ep = &dev->ep[0];
1639 ep->irqs++;
1640 pio_advance(ep);
1641 }
1642
1643 /* dma completion */
1644 if (stat & INT_MSTRDEND) { /* IN */
1645 ACK(INT_MSTRDEND);
1646 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1647 ep->irqs++;
1648 dma_advance(dev, ep);
1649 }
1650 if (stat & INT_MSTWREND) { /* OUT */
1651 ACK(INT_MSTWREND);
1652 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1653 ep->irqs++;
1654 dma_advance(dev, ep);
1655 }
1656 if (stat & INT_MSTWRTMOUT) { /* OUT */
1657 ACK(INT_MSTWRTMOUT);
1658 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1659 ep->irqs++;
1660 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1661 // reset dma? then dma_advance()
1662 }
1663
1664 /* pio */
1665 for (i = 1; i < 4; i++) {
1666 u32 tmp = INT_EPxDATASET(i);
1667
1668 if (!(stat & tmp))
1669 continue;
1670 ep = &dev->ep[i];
1671 pio_advance(ep);
1672 if (list_empty (&ep->queue))
1673 pio_irq_disable(dev, regs, i);
1674 stat &= ~tmp;
1675 handled = 1;
1676 ep->irqs++;
1677 }
1678
1679 if (rescans--)
1680 goto rescan;
1681
1682 done:
1683 (void)readl(&regs->int_enable);
1684 spin_unlock(&dev->lock);
1685 if (stat)
1686 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1687 readl(&regs->int_status), dev->int_enable);
1688 return IRQ_RETVAL(handled);
1689 }
1690
1691 #undef ACK
1692
1693 /*-------------------------------------------------------------------------*/
1694
1695 static void gadget_release(struct device *_dev)
1696 {
1697 struct goku_udc *dev = dev_get_drvdata(_dev);
1698
1699 kfree(dev);
1700 }
1701
1702 /* tear down the binding between this driver and the pci device */
1703
1704 static void goku_remove(struct pci_dev *pdev)
1705 {
1706 struct goku_udc *dev = pci_get_drvdata(pdev);
1707
1708 DBG(dev, "%s\n", __func__);
1709
1710 BUG_ON(dev->driver);
1711
1712 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1713 remove_proc_entry(proc_node_name, NULL);
1714 #endif
1715 if (dev->regs)
1716 udc_reset(dev);
1717 if (dev->got_irq)
1718 free_irq(pdev->irq, dev);
1719 if (dev->regs)
1720 iounmap(dev->regs);
1721 if (dev->got_region)
1722 release_mem_region(pci_resource_start (pdev, 0),
1723 pci_resource_len (pdev, 0));
1724 if (dev->enabled)
1725 pci_disable_device(pdev);
1726 device_unregister(&dev->gadget.dev);
1727
1728 pci_set_drvdata(pdev, NULL);
1729 dev->regs = NULL;
1730 the_controller = NULL;
1731
1732 INFO(dev, "unbind\n");
1733 }
1734
1735 /* wrap this driver around the specified pci device, but
1736 * don't respond over USB until a gadget driver binds to us.
1737 */
1738
1739 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1740 {
1741 struct goku_udc *dev = NULL;
1742 unsigned long resource, len;
1743 void __iomem *base = NULL;
1744 int retval;
1745
1746 /* if you want to support more than one controller in a system,
1747 * usb_gadget_driver_{register,unregister}() must change.
1748 */
1749 if (the_controller) {
1750 pr_warning("ignoring %s\n", pci_name(pdev));
1751 return -EBUSY;
1752 }
1753 if (!pdev->irq) {
1754 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1755 retval = -ENODEV;
1756 goto done;
1757 }
1758
1759 /* alloc, and start init */
1760 dev = kzalloc (sizeof *dev, GFP_KERNEL);
1761 if (dev == NULL){
1762 pr_debug("enomem %s\n", pci_name(pdev));
1763 retval = -ENOMEM;
1764 goto done;
1765 }
1766
1767 spin_lock_init(&dev->lock);
1768 dev->pdev = pdev;
1769 dev->gadget.ops = &goku_ops;
1770
1771 /* the "gadget" abstracts/virtualizes the controller */
1772 dev_set_name(&dev->gadget.dev, "gadget");
1773 dev->gadget.dev.parent = &pdev->dev;
1774 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1775 dev->gadget.dev.release = gadget_release;
1776 dev->gadget.name = driver_name;
1777
1778 /* now all the pci goodies ... */
1779 retval = pci_enable_device(pdev);
1780 if (retval < 0) {
1781 DBG(dev, "can't enable, %d\n", retval);
1782 goto done;
1783 }
1784 dev->enabled = 1;
1785
1786 resource = pci_resource_start(pdev, 0);
1787 len = pci_resource_len(pdev, 0);
1788 if (!request_mem_region(resource, len, driver_name)) {
1789 DBG(dev, "controller already in use\n");
1790 retval = -EBUSY;
1791 goto done;
1792 }
1793 dev->got_region = 1;
1794
1795 base = ioremap_nocache(resource, len);
1796 if (base == NULL) {
1797 DBG(dev, "can't map memory\n");
1798 retval = -EFAULT;
1799 goto done;
1800 }
1801 dev->regs = (struct goku_udc_regs __iomem *) base;
1802
1803 pci_set_drvdata(pdev, dev);
1804 INFO(dev, "%s\n", driver_desc);
1805 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1806 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1807
1808 /* init to known state, then setup irqs */
1809 udc_reset(dev);
1810 udc_reinit (dev);
1811 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1812 driver_name, dev) != 0) {
1813 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1814 retval = -EBUSY;
1815 goto done;
1816 }
1817 dev->got_irq = 1;
1818 if (use_dma)
1819 pci_set_master(pdev);
1820
1821
1822 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1823 create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1824 #endif
1825
1826 /* done */
1827 the_controller = dev;
1828 retval = device_register(&dev->gadget.dev);
1829 if (retval == 0)
1830 return 0;
1831
1832 done:
1833 if (dev)
1834 goku_remove (pdev);
1835 return retval;
1836 }
1837
1838
1839 /*-------------------------------------------------------------------------*/
1840
1841 static const struct pci_device_id pci_ids[] = { {
1842 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1843 .class_mask = ~0,
1844 .vendor = 0x102f, /* Toshiba */
1845 .device = 0x0107, /* this UDC */
1846 .subvendor = PCI_ANY_ID,
1847 .subdevice = PCI_ANY_ID,
1848
1849 }, { /* end: all zeroes */ }
1850 };
1851 MODULE_DEVICE_TABLE (pci, pci_ids);
1852
1853 static struct pci_driver goku_pci_driver = {
1854 .name = (char *) driver_name,
1855 .id_table = pci_ids,
1856
1857 .probe = goku_probe,
1858 .remove = goku_remove,
1859
1860 };
1861
1862 static int __init init (void)
1863 {
1864 return pci_register_driver (&goku_pci_driver);
1865 }
1866 module_init (init);
1867
1868 static void __exit cleanup (void)
1869 {
1870 pci_unregister_driver (&goku_pci_driver);
1871 }
1872 module_exit (cleanup);
Tomato firmware and modifications.