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Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / drivers / usb / gadget / goku_udc.c
blob52dd6cc6c0aa2e3e016eedced4fa00f61dafb896
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/seq_file.h>
39 #include <linux/device.h>
40 #include <linux/usb/ch9.h>
41 #include <linux/usb/gadget.h>
42 #include <linux/prefetch.h>
43
44 #include <asm/byteorder.h>
45 #include <asm/io.h>
46 #include <asm/irq.h>
47 #include <asm/unaligned.h>
48
49
50 #include "goku_udc.h"
51
52 #define DRIVER_DESC "TC86C001 USB Device Controller"
53 #define DRIVER_VERSION "30-Oct 2003"
54
55 static const char driver_name [] = "goku_udc";
56 static const char driver_desc [] = DRIVER_DESC;
57
58 MODULE_AUTHOR("source@mvista.com");
59 MODULE_DESCRIPTION(DRIVER_DESC);
60 MODULE_LICENSE("GPL");
61
62
63 /*
64 * IN dma behaves ok under testing, though the IN-dma abort paths don't
65 * seem to behave quite as expected. Used by default.
66 *
67 * OUT dma documents design problems handling the common "short packet"
68 * transfer termination policy; it couldn't be enabled by default, even
69 * if the OUT-dma abort problems had a resolution.
70 */
71 static unsigned use_dma = 1;
72
73 #if 0
74 //#include <linux/moduleparam.h>
75 /* "modprobe goku_udc use_dma=1" etc
76 * 0 to disable dma
77 * 1 to use IN dma only (normal operation)
78 * 2 to use IN and OUT dma
79 */
80 module_param(use_dma, uint, S_IRUGO);
81 #endif
82
83 /*-------------------------------------------------------------------------*/
84
85 static void nuke(struct goku_ep *, int status);
86
87 static inline void
88 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
89 {
90 writel(COMMAND_EP(epnum) | command, &regs->Command);
91 udelay(300);
92 }
93
94 static int
95 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
96 {
97 struct goku_udc *dev;
98 struct goku_ep *ep;
99 u32 mode;
100 u16 max;
101 unsigned long flags;
102
103 ep = container_of(_ep, struct goku_ep, ep);
104 if (!_ep || !desc
105 || desc->bDescriptorType != USB_DT_ENDPOINT)
106 return -EINVAL;
107 dev = ep->dev;
108 if (ep == &dev->ep[0])
109 return -EINVAL;
110 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
111 return -ESHUTDOWN;
112 if (ep->num != usb_endpoint_num(desc))
113 return -EINVAL;
114
115 switch (usb_endpoint_type(desc)) {
116 case USB_ENDPOINT_XFER_BULK:
117 case USB_ENDPOINT_XFER_INT:
118 break;
119 default:
120 return -EINVAL;
121 }
122
123 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
124 != EPxSTATUS_EP_INVALID)
125 return -EBUSY;
126
127 /* enabling the no-toggle interrupt mode would need an api hook */
128 mode = 0;
129 max = get_unaligned_le16(&desc->wMaxPacketSize);
130 switch (max) {
131 case 64: mode++;
132 case 32: mode++;
133 case 16: mode++;
134 case 8: mode <<= 3;
135 break;
136 default:
137 return -EINVAL;
138 }
139 mode |= 2 << 1; /* bulk, or intr-with-toggle */
140
141 /* ep1/ep2 dma direction is chosen early; it works in the other
142 * direction, with pio. be cautious with out-dma.
143 */
144 ep->is_in = usb_endpoint_dir_in(desc);
145 if (ep->is_in) {
146 mode |= 1;
147 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
148 } else {
149 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
150 if (ep->dma)
151 DBG(dev, "%s out-dma hides short packets\n",
152 ep->ep.name);
153 }
154
155 spin_lock_irqsave(&ep->dev->lock, flags);
156
157 /* ep1 and ep2 can do double buffering and/or dma */
158 if (ep->num < 3) {
159 struct goku_udc_regs __iomem *regs = ep->dev->regs;
160 u32 tmp;
161
162 /* double buffer except (for now) with pio in */
163 tmp = ((ep->dma || !ep->is_in)
164 ? 0x10 /* double buffered */
165 : 0x11 /* single buffer */
166 ) << ep->num;
167 tmp |= readl(&regs->EPxSingle);
168 writel(tmp, &regs->EPxSingle);
169
170 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
171 tmp |= readl(&regs->EPxBCS);
172 writel(tmp, &regs->EPxBCS);
173 }
174 writel(mode, ep->reg_mode);
175 command(ep->dev->regs, COMMAND_RESET, ep->num);
176 ep->ep.maxpacket = max;
177 ep->stopped = 0;
178 ep->ep.desc = desc;
179 spin_unlock_irqrestore(&ep->dev->lock, flags);
180
181 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
182 ep->is_in ? "IN" : "OUT",
183 ep->dma ? "dma" : "pio",
184 max);
185
186 return 0;
187 }
188
189 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
190 {
191 struct goku_udc *dev = ep->dev;
192
193 if (regs) {
194 command(regs, COMMAND_INVALID, ep->num);
195 if (ep->num) {
196 if (ep->num == UDC_MSTWR_ENDPOINT)
197 dev->int_enable &= ~(INT_MSTWREND
198 |INT_MSTWRTMOUT);
199 else if (ep->num == UDC_MSTRD_ENDPOINT)
200 dev->int_enable &= ~INT_MSTRDEND;
201 dev->int_enable &= ~INT_EPxDATASET (ep->num);
202 } else
203 dev->int_enable &= ~INT_EP0;
204 writel(dev->int_enable, &regs->int_enable);
205 readl(&regs->int_enable);
206 if (ep->num < 3) {
207 struct goku_udc_regs __iomem *r = ep->dev->regs;
208 u32 tmp;
209
210 tmp = readl(&r->EPxSingle);
211 tmp &= ~(0x11 << ep->num);
212 writel(tmp, &r->EPxSingle);
213
214 tmp = readl(&r->EPxBCS);
215 tmp &= ~(0x11 << ep->num);
216 writel(tmp, &r->EPxBCS);
217 }
218 /* reset dma in case we're still using it */
219 if (ep->dma) {
220 u32 master;
221
222 master = readl(&regs->dma_master) & MST_RW_BITS;
223 if (ep->num == UDC_MSTWR_ENDPOINT) {
224 master &= ~MST_W_BITS;
225 master |= MST_WR_RESET;
226 } else {
227 master &= ~MST_R_BITS;
228 master |= MST_RD_RESET;
229 }
230 writel(master, &regs->dma_master);
231 }
232 }
233
234 ep->ep.maxpacket = MAX_FIFO_SIZE;
235 ep->ep.desc = NULL;
236 ep->stopped = 1;
237 ep->irqs = 0;
238 ep->dma = 0;
239 }
240
241 static int goku_ep_disable(struct usb_ep *_ep)
242 {
243 struct goku_ep *ep;
244 struct goku_udc *dev;
245 unsigned long flags;
246
247 ep = container_of(_ep, struct goku_ep, ep);
248 if (!_ep || !ep->ep.desc)
249 return -ENODEV;
250 dev = ep->dev;
251 if (dev->ep0state == EP0_SUSPEND)
252 return -EBUSY;
253
254 VDBG(dev, "disable %s\n", _ep->name);
255
256 spin_lock_irqsave(&dev->lock, flags);
257 nuke(ep, -ESHUTDOWN);
258 ep_reset(dev->regs, ep);
259 spin_unlock_irqrestore(&dev->lock, flags);
260
261 return 0;
262 }
263
264 /*-------------------------------------------------------------------------*/
265
266 static struct usb_request *
267 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
268 {
269 struct goku_request *req;
270
271 if (!_ep)
272 return NULL;
273 req = kzalloc(sizeof *req, gfp_flags);
274 if (!req)
275 return NULL;
276
277 INIT_LIST_HEAD(&req->queue);
278 return &req->req;
279 }
280
281 static void
282 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
283 {
284 struct goku_request *req;
285
286 if (!_ep || !_req)
287 return;
288
289 req = container_of(_req, struct goku_request, req);
290 WARN_ON(!list_empty(&req->queue));
291 kfree(req);
292 }
293
294 /*-------------------------------------------------------------------------*/
295
296 static void
297 done(struct goku_ep *ep, struct goku_request *req, int status)
298 {
299 struct goku_udc *dev;
300 unsigned stopped = ep->stopped;
301
302 list_del_init(&req->queue);
303
304 if (likely(req->req.status == -EINPROGRESS))
305 req->req.status = status;
306 else
307 status = req->req.status;
308
309 dev = ep->dev;
310
311 if (ep->dma)
312 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
313
314 #ifndef USB_TRACE
315 if (status && status != -ESHUTDOWN)
316 #endif
317 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
318 ep->ep.name, &req->req, status,
319 req->req.actual, req->req.length);
320
321 /* don't modify queue heads during completion callback */
322 ep->stopped = 1;
323 spin_unlock(&dev->lock);
324 req->req.complete(&ep->ep, &req->req);
325 spin_lock(&dev->lock);
326 ep->stopped = stopped;
327 }
328
329 /*-------------------------------------------------------------------------*/
330
331 static inline int
332 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
333 {
334 unsigned length, count;
335
336 length = min(req->req.length - req->req.actual, max);
337 req->req.actual += length;
338
339 count = length;
340 while (likely(count--))
341 writel(*buf++, fifo);
342 return length;
343 }
344
345 // return: 0 = still running, 1 = completed, negative = errno
346 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
347 {
348 struct goku_udc *dev = ep->dev;
349 u32 tmp;
350 u8 *buf;
351 unsigned count;
352 int is_last;
353
354 tmp = readl(&dev->regs->DataSet);
355 buf = req->req.buf + req->req.actual;
356 prefetch(buf);
357
358 dev = ep->dev;
359 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
360 return -EL2HLT;
361
362 /* NOTE: just single-buffered PIO-IN for now. */
363 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
364 return 0;
365
366 /* clear our "packet available" irq */
367 if (ep->num != 0)
368 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
369
370 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
371
372 /* last packet often short (sometimes a zlp, especially on ep0) */
373 if (unlikely(count != ep->ep.maxpacket)) {
374 writel(~(1<<ep->num), &dev->regs->EOP);
375 if (ep->num == 0) {
376 dev->ep[0].stopped = 1;
377 dev->ep0state = EP0_STATUS;
378 }
379 is_last = 1;
380 } else {
381 if (likely(req->req.length != req->req.actual)
382 || req->req.zero)
383 is_last = 0;
384 else
385 is_last = 1;
386 }
387 #if 0 /* printk seemed to trash is_last...*/
388 //#ifdef USB_TRACE
389 VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
390 ep->ep.name, count, is_last ? "/last" : "",
391 req->req.length - req->req.actual, req);
392 #endif
393
394 /* requests complete when all IN data is in the FIFO,
395 * or sometimes later, if a zlp was needed.
396 */
397 if (is_last) {
398 done(ep, req, 0);
399 return 1;
400 }
401
402 return 0;
403 }
404
405 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
406 {
407 struct goku_udc_regs __iomem *regs;
408 u32 size, set;
409 u8 *buf;
410 unsigned bufferspace, is_short, dbuff;
411
412 regs = ep->dev->regs;
413 top:
414 buf = req->req.buf + req->req.actual;
415 prefetchw(buf);
416
417 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
418 return -EL2HLT;
419
420 dbuff = (ep->num == 1 || ep->num == 2);
421 do {
422 /* ack dataset irq matching the status we'll handle */
423 if (ep->num != 0)
424 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
425
426 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
427 size = readl(&regs->EPxSizeLA[ep->num]);
428 bufferspace = req->req.length - req->req.actual;
429
430 /* usually do nothing without an OUT packet */
431 if (likely(ep->num != 0 || bufferspace != 0)) {
432 if (unlikely(set == 0))
433 break;
434 /* use ep1/ep2 double-buffering for OUT */
435 if (!(size & PACKET_ACTIVE))
436 size = readl(&regs->EPxSizeLB[ep->num]);
437 if (!(size & PACKET_ACTIVE)) /* "can't happen" */
438 break;
439 size &= DATASIZE; /* EPxSizeH == 0 */
440
441 /* ep0out no-out-data case for set_config, etc */
442 } else
443 size = 0;
444
445 /* read all bytes from this packet */
446 req->req.actual += size;
447 is_short = (size < ep->ep.maxpacket);
448 #ifdef USB_TRACE
449 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
450 ep->ep.name, size, is_short ? "/S" : "",
451 req, req->req.actual, req->req.length);
452 #endif
453 while (likely(size-- != 0)) {
454 u8 byte = (u8) readl(ep->reg_fifo);
455
456 if (unlikely(bufferspace == 0)) {
457 /* this happens when the driver's buffer
458 * is smaller than what the host sent.
459 * discard the extra data in this packet.
460 */
461 if (req->req.status != -EOVERFLOW)
462 DBG(ep->dev, "%s overflow %u\n",
463 ep->ep.name, size);
464 req->req.status = -EOVERFLOW;
465 } else {
466 *buf++ = byte;
467 bufferspace--;
468 }
469 }
470
471 /* completion */
472 if (unlikely(is_short || req->req.actual == req->req.length)) {
473 if (unlikely(ep->num == 0)) {
474 /* non-control endpoints now usable? */
475 if (ep->dev->req_config)
476 writel(ep->dev->configured
477 ? USBSTATE_CONFIGURED
478 : 0,
479 &regs->UsbState);
480 /* ep0out status stage */
481 writel(~(1<<0), &regs->EOP);
482 ep->stopped = 1;
483 ep->dev->ep0state = EP0_STATUS;
484 }
485 done(ep, req, 0);
486
487 /* empty the second buffer asap */
488 if (dbuff && !list_empty(&ep->queue)) {
489 req = list_entry(ep->queue.next,
490 struct goku_request, queue);
491 goto top;
492 }
493 return 1;
494 }
495 } while (dbuff);
496 return 0;
497 }
498
499 static inline void
500 pio_irq_enable(struct goku_udc *dev,
501 struct goku_udc_regs __iomem *regs, int epnum)
502 {
503 dev->int_enable |= INT_EPxDATASET (epnum);
504 writel(dev->int_enable, &regs->int_enable);
505 /* write may still be posted */
506 }
507
508 static inline void
509 pio_irq_disable(struct goku_udc *dev,
510 struct goku_udc_regs __iomem *regs, int epnum)
511 {
512 dev->int_enable &= ~INT_EPxDATASET (epnum);
513 writel(dev->int_enable, &regs->int_enable);
514 /* write may still be posted */
515 }
516
517 static inline void
518 pio_advance(struct goku_ep *ep)
519 {
520 struct goku_request *req;
521
522 if (unlikely(list_empty (&ep->queue)))
523 return;
524 req = list_entry(ep->queue.next, struct goku_request, queue);
525 (ep->is_in ? write_fifo : read_fifo)(ep, req);
526 }
527
528
529 /*-------------------------------------------------------------------------*/
530
531 // return: 0 = q running, 1 = q stopped, negative = errno
532 static int start_dma(struct goku_ep *ep, struct goku_request *req)
533 {
534 struct goku_udc_regs __iomem *regs = ep->dev->regs;
535 u32 master;
536 u32 start = req->req.dma;
537 u32 end = start + req->req.length - 1;
538
539 master = readl(&regs->dma_master) & MST_RW_BITS;
540
541 /* re-init the bits affecting IN dma; careful with zlps */
542 if (likely(ep->is_in)) {
543 if (unlikely(master & MST_RD_ENA)) {
544 DBG (ep->dev, "start, IN active dma %03x!!\n",
545 master);
546 // return -EL2HLT;
547 }
548 writel(end, &regs->in_dma_end);
549 writel(start, &regs->in_dma_start);
550
551 master &= ~MST_R_BITS;
552 if (unlikely(req->req.length == 0))
553 master = MST_RD_ENA | MST_RD_EOPB;
554 else if ((req->req.length % ep->ep.maxpacket) != 0
555 || req->req.zero)
556 master = MST_RD_ENA | MST_EOPB_ENA;
557 else
558 master = MST_RD_ENA | MST_EOPB_DIS;
559
560 ep->dev->int_enable |= INT_MSTRDEND;
561
562 /* Goku DMA-OUT merges short packets, which plays poorly with
563 * protocols where short packets mark the transfer boundaries.
564 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
565 * ending transfers after 3 SOFs; we don't turn it on.
566 */
567 } else {
568 if (unlikely(master & MST_WR_ENA)) {
569 DBG (ep->dev, "start, OUT active dma %03x!!\n",
570 master);
571 // return -EL2HLT;
572 }
573 writel(end, &regs->out_dma_end);
574 writel(start, &regs->out_dma_start);
575
576 master &= ~MST_W_BITS;
577 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
578
579 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
580 }
581
582 writel(master, &regs->dma_master);
583 writel(ep->dev->int_enable, &regs->int_enable);
584 return 0;
585 }
586
587 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
588 {
589 struct goku_request *req;
590 struct goku_udc_regs __iomem *regs = ep->dev->regs;
591 u32 master;
592
593 master = readl(&regs->dma_master);
594
595 if (unlikely(list_empty(&ep->queue))) {
596 stop:
597 if (ep->is_in)
598 dev->int_enable &= ~INT_MSTRDEND;
599 else
600 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
601 writel(dev->int_enable, &regs->int_enable);
602 return;
603 }
604 req = list_entry(ep->queue.next, struct goku_request, queue);
605
606 /* normal hw dma completion (not abort) */
607 if (likely(ep->is_in)) {
608 if (unlikely(master & MST_RD_ENA))
609 return;
610 req->req.actual = readl(&regs->in_dma_current);
611 } else {
612 if (unlikely(master & MST_WR_ENA))
613 return;
614
615 /* hardware merges short packets, and also hides packet
616 * overruns. a partial packet MAY be in the fifo here.
617 */
618 req->req.actual = readl(&regs->out_dma_current);
619 }
620 req->req.actual -= req->req.dma;
621 req->req.actual++;
622
623 #ifdef USB_TRACE
624 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
625 ep->ep.name, ep->is_in ? "IN" : "OUT",
626 req->req.actual, req->req.length, req);
627 #endif
628 done(ep, req, 0);
629 if (list_empty(&ep->queue))
630 goto stop;
631 req = list_entry(ep->queue.next, struct goku_request, queue);
632 (void) start_dma(ep, req);
633 }
634
635 static void abort_dma(struct goku_ep *ep, int status)
636 {
637 struct goku_udc_regs __iomem *regs = ep->dev->regs;
638 struct goku_request *req;
639 u32 curr, master;
640
641 /* NAK future host requests, hoping the implicit delay lets the
642 * dma engine finish reading (or writing) its latest packet and
643 * empty the dma buffer (up to 16 bytes).
644 *
645 * This avoids needing to clean up a partial packet in the fifo;
646 * we can't do that for IN without side effects to HALT and TOGGLE.
647 */
648 command(regs, COMMAND_FIFO_DISABLE, ep->num);
649 req = list_entry(ep->queue.next, struct goku_request, queue);
650 master = readl(&regs->dma_master) & MST_RW_BITS;
651
652 /* FIXME using these resets isn't usably documented. this may
653 * not work unless it's followed by disabling the endpoint.
654 *
655 * FIXME the OUT reset path doesn't even behave consistently.
656 */
657 if (ep->is_in) {
658 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
659 goto finished;
660 curr = readl(&regs->in_dma_current);
661
662 writel(curr, &regs->in_dma_end);
663 writel(curr, &regs->in_dma_start);
664
665 master &= ~MST_R_BITS;
666 master |= MST_RD_RESET;
667 writel(master, &regs->dma_master);
668
669 if (readl(&regs->dma_master) & MST_RD_ENA)
670 DBG(ep->dev, "IN dma active after reset!\n");
671
672 } else {
673 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
674 goto finished;
675 curr = readl(&regs->out_dma_current);
676
677 writel(curr, &regs->out_dma_end);
678 writel(curr, &regs->out_dma_start);
679
680 master &= ~MST_W_BITS;
681 master |= MST_WR_RESET;
682 writel(master, &regs->dma_master);
683
684 if (readl(&regs->dma_master) & MST_WR_ENA)
685 DBG(ep->dev, "OUT dma active after reset!\n");
686 }
687 req->req.actual = (curr - req->req.dma) + 1;
688 req->req.status = status;
689
690 VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name,
691 ep->is_in ? "IN" : "OUT",
692 req->req.actual, req->req.length);
693
694 command(regs, COMMAND_FIFO_ENABLE, ep->num);
695
696 return;
697
698 finished:
699 /* dma already completed; no abort needed */
700 command(regs, COMMAND_FIFO_ENABLE, ep->num);
701 req->req.actual = req->req.length;
702 req->req.status = 0;
703 }
704
705 /*-------------------------------------------------------------------------*/
706
707 static int
708 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
709 {
710 struct goku_request *req;
711 struct goku_ep *ep;
712 struct goku_udc *dev;
713 unsigned long flags;
714 int status;
715
716 /* always require a cpu-view buffer so pio works */
717 req = container_of(_req, struct goku_request, req);
718 if (unlikely(!_req || !_req->complete
719 || !_req->buf || !list_empty(&req->queue)))
720 return -EINVAL;
721 ep = container_of(_ep, struct goku_ep, ep);
722 if (unlikely(!_ep || (!ep->ep.desc && ep->num != 0)))
723 return -EINVAL;
724 dev = ep->dev;
725 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
726 return -ESHUTDOWN;
727
728 /* can't touch registers when suspended */
729 if (dev->ep0state == EP0_SUSPEND)
730 return -EBUSY;
731
732 /* set up dma mapping in case the caller didn't */
733 if (ep->dma) {
734 status = usb_gadget_map_request(&dev->gadget, &req->req,
735 ep->is_in);
736 if (status)
737 return status;
738 }
739
740 #ifdef USB_TRACE
741 VDBG(dev, "%s queue req %p, len %u buf %p\n",
742 _ep->name, _req, _req->length, _req->buf);
743 #endif
744
745 spin_lock_irqsave(&dev->lock, flags);
746
747 _req->status = -EINPROGRESS;
748 _req->actual = 0;
749
750 /* for ep0 IN without premature status, zlp is required and
751 * writing EOP starts the status stage (OUT).
752 */
753 if (unlikely(ep->num == 0 && ep->is_in))
754 _req->zero = 1;
755
756 /* kickstart this i/o queue? */
757 status = 0;
758 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
759 /* dma: done after dma completion IRQ (or error)
760 * pio: done after last fifo operation
761 */
762 if (ep->dma)
763 status = start_dma(ep, req);
764 else
765 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
766
767 if (unlikely(status != 0)) {
768 if (status > 0)
769 status = 0;
770 req = NULL;
771 }
772
773 } /* else pio or dma irq handler advances the queue. */
774
775 if (likely(req != 0))
776 list_add_tail(&req->queue, &ep->queue);
777
778 if (likely(!list_empty(&ep->queue))
779 && likely(ep->num != 0)
780 && !ep->dma
781 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
782 pio_irq_enable(dev, dev->regs, ep->num);
783
784 spin_unlock_irqrestore(&dev->lock, flags);
785
786 /* pci writes may still be posted */
787 return status;
788 }
789
790 /* dequeue ALL requests */
791 static void nuke(struct goku_ep *ep, int status)
792 {
793 struct goku_request *req;
794
795 ep->stopped = 1;
796 if (list_empty(&ep->queue))
797 return;
798 if (ep->dma)
799 abort_dma(ep, status);
800 while (!list_empty(&ep->queue)) {
801 req = list_entry(ep->queue.next, struct goku_request, queue);
802 done(ep, req, status);
803 }
804 }
805
806 /* dequeue JUST ONE request */
807 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
808 {
809 struct goku_request *req;
810 struct goku_ep *ep;
811 struct goku_udc *dev;
812 unsigned long flags;
813
814 ep = container_of(_ep, struct goku_ep, ep);
815 if (!_ep || !_req || (!ep->ep.desc && ep->num != 0))
816 return -EINVAL;
817 dev = ep->dev;
818 if (!dev->driver)
819 return -ESHUTDOWN;
820
821 /* we can't touch (dma) registers when suspended */
822 if (dev->ep0state == EP0_SUSPEND)
823 return -EBUSY;
824
825 VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name,
826 ep->is_in ? "IN" : "OUT",
827 ep->dma ? "dma" : "pio",
828 _req);
829
830 spin_lock_irqsave(&dev->lock, flags);
831
832 /* make sure it's actually queued on this endpoint */
833 list_for_each_entry (req, &ep->queue, queue) {
834 if (&req->req == _req)
835 break;
836 }
837 if (&req->req != _req) {
838 spin_unlock_irqrestore (&dev->lock, flags);
839 return -EINVAL;
840 }
841
842 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
843 abort_dma(ep, -ECONNRESET);
844 done(ep, req, -ECONNRESET);
845 dma_advance(dev, ep);
846 } else if (!list_empty(&req->queue))
847 done(ep, req, -ECONNRESET);
848 else
849 req = NULL;
850 spin_unlock_irqrestore(&dev->lock, flags);
851
852 return req ? 0 : -EOPNOTSUPP;
853 }
854
855 /*-------------------------------------------------------------------------*/
856
857 static void goku_clear_halt(struct goku_ep *ep)
858 {
859 // assert (ep->num !=0)
860 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
861 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
862 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
863 if (ep->stopped) {
864 ep->stopped = 0;
865 if (ep->dma) {
866 struct goku_request *req;
867
868 if (list_empty(&ep->queue))
869 return;
870 req = list_entry(ep->queue.next, struct goku_request,
871 queue);
872 (void) start_dma(ep, req);
873 } else
874 pio_advance(ep);
875 }
876 }
877
878 static int goku_set_halt(struct usb_ep *_ep, int value)
879 {
880 struct goku_ep *ep;
881 unsigned long flags;
882 int retval = 0;
883
884 if (!_ep)
885 return -ENODEV;
886 ep = container_of (_ep, struct goku_ep, ep);
887
888 if (ep->num == 0) {
889 if (value) {
890 ep->dev->ep0state = EP0_STALL;
891 ep->dev->ep[0].stopped = 1;
892 } else
893 return -EINVAL;
894
895 /* don't change EPxSTATUS_EP_INVALID to READY */
896 } else if (!ep->ep.desc) {
897 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
898 return -EINVAL;
899 }
900
901 spin_lock_irqsave(&ep->dev->lock, flags);
902 if (!list_empty(&ep->queue))
903 retval = -EAGAIN;
904 else if (ep->is_in && value
905 /* data in (either) packet buffer? */
906 && (readl(&ep->dev->regs->DataSet)
907 & DATASET_AB(ep->num)))
908 retval = -EAGAIN;
909 else if (!value)
910 goku_clear_halt(ep);
911 else {
912 ep->stopped = 1;
913 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
914 command(ep->dev->regs, COMMAND_STALL, ep->num);
915 readl(ep->reg_status);
916 }
917 spin_unlock_irqrestore(&ep->dev->lock, flags);
918 return retval;
919 }
920
921 static int goku_fifo_status(struct usb_ep *_ep)
922 {
923 struct goku_ep *ep;
924 struct goku_udc_regs __iomem *regs;
925 u32 size;
926
927 if (!_ep)
928 return -ENODEV;
929 ep = container_of(_ep, struct goku_ep, ep);
930
931 /* size is only reported sanely for OUT */
932 if (ep->is_in)
933 return -EOPNOTSUPP;
934
935 /* ignores 16-byte dma buffer; SizeH == 0 */
936 regs = ep->dev->regs;
937 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
938 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
939 VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size);
940 return size;
941 }
942
943 static void goku_fifo_flush(struct usb_ep *_ep)
944 {
945 struct goku_ep *ep;
946 struct goku_udc_regs __iomem *regs;
947 u32 size;
948
949 if (!_ep)
950 return;
951 ep = container_of(_ep, struct goku_ep, ep);
952 VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name);
953
954 /* don't change EPxSTATUS_EP_INVALID to READY */
955 if (!ep->ep.desc && ep->num != 0) {
956 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
957 return;
958 }
959
960 regs = ep->dev->regs;
961 size = readl(&regs->EPxSizeLA[ep->num]);
962 size &= DATASIZE;
963
964 /* Non-desirable behavior: FIFO_CLEAR also clears the
965 * endpoint halt feature. For OUT, we _could_ just read
966 * the bytes out (PIO, if !ep->dma); for in, no choice.
967 */
968 if (size)
969 command(regs, COMMAND_FIFO_CLEAR, ep->num);
970 }
971
972 static struct usb_ep_ops goku_ep_ops = {
973 .enable = goku_ep_enable,
974 .disable = goku_ep_disable,
975
976 .alloc_request = goku_alloc_request,
977 .free_request = goku_free_request,
978
979 .queue = goku_queue,
980 .dequeue = goku_dequeue,
981
982 .set_halt = goku_set_halt,
983 .fifo_status = goku_fifo_status,
984 .fifo_flush = goku_fifo_flush,
985 };
986
987 /*-------------------------------------------------------------------------*/
988
989 static int goku_get_frame(struct usb_gadget *_gadget)
990 {
991 return -EOPNOTSUPP;
992 }
993
994 static int goku_udc_start(struct usb_gadget *g,
995 struct usb_gadget_driver *driver);
996 static int goku_udc_stop(struct usb_gadget *g,
997 struct usb_gadget_driver *driver);
998
999 static const struct usb_gadget_ops goku_ops = {
1000 .get_frame = goku_get_frame,
1001 .udc_start = goku_udc_start,
1002 .udc_stop = goku_udc_stop,
1003 // no remote wakeup
1004 // not selfpowered
1005 };
1006
1007 /*-------------------------------------------------------------------------*/
1008
1009 static inline const char *dmastr(void)
1010 {
1011 if (use_dma == 0)
1012 return "(dma disabled)";
1013 else if (use_dma == 2)
1014 return "(dma IN and OUT)";
1015 else
1016 return "(dma IN)";
1017 }
1018
1019 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1020
1021 static const char proc_node_name [] = "driver/udc";
1022
1023 #define FOURBITS "%s%s%s%s"
1024 #define EIGHTBITS FOURBITS FOURBITS
1025
1026 static void dump_intmask(struct seq_file *m, const char *label, u32 mask)
1027 {
1028 /* int_status is the same format ... */
1029 seq_printf(m,
1030 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1031 label, mask,
1032 (mask & INT_PWRDETECT) ? " power" : "",
1033 (mask & INT_SYSERROR) ? " sys" : "",
1034 (mask & INT_MSTRDEND) ? " in-dma" : "",
1035 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1036
1037 (mask & INT_MSTWREND) ? " out-dma" : "",
1038 (mask & INT_MSTWRSET) ? " wrset" : "",
1039 (mask & INT_ERR) ? " err" : "",
1040 (mask & INT_SOF) ? " sof" : "",
1041
1042 (mask & INT_EP3NAK) ? " ep3nak" : "",
1043 (mask & INT_EP2NAK) ? " ep2nak" : "",
1044 (mask & INT_EP1NAK) ? " ep1nak" : "",
1045 (mask & INT_EP3DATASET) ? " ep3" : "",
1046
1047 (mask & INT_EP2DATASET) ? " ep2" : "",
1048 (mask & INT_EP1DATASET) ? " ep1" : "",
1049 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1050 (mask & INT_STATUS) ? " ep0status" : "",
1051
1052 (mask & INT_SETUP) ? " setup" : "",
1053 (mask & INT_ENDPOINT0) ? " ep0" : "",
1054 (mask & INT_USBRESET) ? " reset" : "",
1055 (mask & INT_SUSPEND) ? " suspend" : "");
1056 }
1057
1058
1059 static int udc_proc_read(struct seq_file *m, void *v)
1060 {
1061 struct goku_udc *dev = m->private;
1062 struct goku_udc_regs __iomem *regs = dev->regs;
1063 unsigned long flags;
1064 int i, is_usb_connected;
1065 u32 tmp;
1066
1067 local_irq_save(flags);
1068
1069 /* basic device status */
1070 tmp = readl(&regs->power_detect);
1071 is_usb_connected = tmp & PW_DETECT;
1072 seq_printf(m,
1073 "%s - %s\n"
1074 "%s version: %s %s\n"
1075 "Gadget driver: %s\n"
1076 "Host %s, %s\n"
1077 "\n",
1078 pci_name(dev->pdev), driver_desc,
1079 driver_name, DRIVER_VERSION, dmastr(),
1080 dev->driver ? dev->driver->driver.name : "(none)",
1081 is_usb_connected
1082 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1083 : "disconnected",
1084 ({const char *state;
1085 switch(dev->ep0state){
1086 case EP0_DISCONNECT: state = "ep0_disconnect"; break;
1087 case EP0_IDLE: state = "ep0_idle"; break;
1088 case EP0_IN: state = "ep0_in"; break;
1089 case EP0_OUT: state = "ep0_out"; break;
1090 case EP0_STATUS: state = "ep0_status"; break;
1091 case EP0_STALL: state = "ep0_stall"; break;
1092 case EP0_SUSPEND: state = "ep0_suspend"; break;
1093 default: state = "ep0_?"; break;
1094 } state; })
1095 );
1096
1097 dump_intmask(m, "int_status", readl(&regs->int_status));
1098 dump_intmask(m, "int_enable", readl(&regs->int_enable));
1099
1100 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1101 goto done;
1102
1103 /* registers for (active) device and ep0 */
1104 if (seq_printf(m, "\nirqs %lu\ndataset %02x "
1105 "single.bcs %02x.%02x state %x addr %u\n",
1106 dev->irqs, readl(&regs->DataSet),
1107 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1108 readl(&regs->UsbState),
1109 readl(&regs->address)) < 0)
1110 goto done;
1111
1112 tmp = readl(&regs->dma_master);
1113 if (seq_printf(m,
1114 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1115 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1116 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1117 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1118 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1119
1120 (tmp & MST_RD_EOPB) ? " eopb" : "",
1121 (tmp & MST_RD_RESET) ? " in_reset" : "",
1122 (tmp & MST_WR_RESET) ? " out_reset" : "",
1123 (tmp & MST_RD_ENA) ? " IN" : "",
1124
1125 (tmp & MST_WR_ENA) ? " OUT" : "",
1126 (tmp & MST_CONNECTION)
1127 ? "ep1in/ep2out"
1128 : "ep1out/ep2in") < 0)
1129 goto done;
1130
1131 /* dump endpoint queues */
1132 for (i = 0; i < 4; i++) {
1133 struct goku_ep *ep = &dev->ep [i];
1134 struct goku_request *req;
1135
1136 if (i && !ep->ep.desc)
1137 continue;
1138
1139 tmp = readl(ep->reg_status);
1140 if (seq_printf(m,
1141 "%s %s max %u %s, irqs %lu, "
1142 "status %02x (%s) " FOURBITS "\n",
1143 ep->ep.name,
1144 ep->is_in ? "in" : "out",
1145 ep->ep.maxpacket,
1146 ep->dma ? "dma" : "pio",
1147 ep->irqs,
1148 tmp, ({ char *s;
1149 switch (tmp & EPxSTATUS_EP_MASK) {
1150 case EPxSTATUS_EP_READY:
1151 s = "ready"; break;
1152 case EPxSTATUS_EP_DATAIN:
1153 s = "packet"; break;
1154 case EPxSTATUS_EP_FULL:
1155 s = "full"; break;
1156 case EPxSTATUS_EP_TX_ERR: // host will retry
1157 s = "tx_err"; break;
1158 case EPxSTATUS_EP_RX_ERR:
1159 s = "rx_err"; break;
1160 case EPxSTATUS_EP_BUSY: /* ep0 only */
1161 s = "busy"; break;
1162 case EPxSTATUS_EP_STALL:
1163 s = "stall"; break;
1164 case EPxSTATUS_EP_INVALID: // these "can't happen"
1165 s = "invalid"; break;
1166 default:
1167 s = "?"; break;
1168 }; s; }),
1169 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1170 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1171 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1172 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1173 ) < 0)
1174 goto done;
1175
1176 if (list_empty(&ep->queue)) {
1177 if (seq_puts(m, "\t(nothing queued)\n") < 0)
1178 goto done;
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 if (seq_printf(m,
1193 "\treq %p len %u/%u buf %p\n",
1194 &req->req, tmp, req->req.length,
1195 req->req.buf) < 0)
1196 goto done;
1197 }
1198 }
1199
1200 done:
1201 local_irq_restore(flags);
1202 return 0;
1203 }
1204
1205 /*
1206 * seq_file wrappers for procfile show routines.
1207 */
1208 static int udc_proc_open(struct inode *inode, struct file *file)
1209 {
1210 return single_open(file, udc_proc_read, PDE_DATA(file_inode(file)));
1211 }
1212
1213 static const struct file_operations udc_proc_fops = {
1214 .open = udc_proc_open,
1215 .read = seq_read,
1216 .llseek = seq_lseek,
1217 .release = single_release,
1218 };
1219
1220 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1221
1222 /*-------------------------------------------------------------------------*/
1223
1224 static void udc_reinit (struct goku_udc *dev)
1225 {
1226 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1227
1228 unsigned i;
1229
1230 INIT_LIST_HEAD (&dev->gadget.ep_list);
1231 dev->gadget.ep0 = &dev->ep [0].ep;
1232 dev->gadget.speed = USB_SPEED_UNKNOWN;
1233 dev->ep0state = EP0_DISCONNECT;
1234 dev->irqs = 0;
1235
1236 for (i = 0; i < 4; i++) {
1237 struct goku_ep *ep = &dev->ep[i];
1238
1239 ep->num = i;
1240 ep->ep.name = names[i];
1241 ep->reg_fifo = &dev->regs->ep_fifo [i];
1242 ep->reg_status = &dev->regs->ep_status [i];
1243 ep->reg_mode = &dev->regs->ep_mode[i];
1244
1245 ep->ep.ops = &goku_ep_ops;
1246 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1247 ep->dev = dev;
1248 INIT_LIST_HEAD (&ep->queue);
1249
1250 ep_reset(NULL, ep);
1251 }
1252
1253 dev->ep[0].reg_mode = NULL;
1254 dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1255 list_del_init (&dev->ep[0].ep.ep_list);
1256 }
1257
1258 static void udc_reset(struct goku_udc *dev)
1259 {
1260 struct goku_udc_regs __iomem *regs = dev->regs;
1261
1262 writel(0, &regs->power_detect);
1263 writel(0, &regs->int_enable);
1264 readl(&regs->int_enable);
1265 dev->int_enable = 0;
1266
1267 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1268 * don't let INT_PWRDETECT sequence begin
1269 */
1270 udelay(250);
1271 writel(PW_RESETB, &regs->power_detect);
1272 readl(&regs->int_enable);
1273 }
1274
1275 static void ep0_start(struct goku_udc *dev)
1276 {
1277 struct goku_udc_regs __iomem *regs = dev->regs;
1278 unsigned i;
1279
1280 VDBG(dev, "%s\n", __func__);
1281
1282 udc_reset(dev);
1283 udc_reinit (dev);
1284 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1285
1286 /* hw handles set_address, set_feature, get_status; maybe more */
1287 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1288 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1289 | G_REQMODE_GET_DESC
1290 | G_REQMODE_CLEAR_FEAT
1291 , &regs->reqmode);
1292
1293 for (i = 0; i < 4; i++)
1294 dev->ep[i].irqs = 0;
1295
1296 /* can't modify descriptors after writing UsbReady */
1297 for (i = 0; i < DESC_LEN; i++)
1298 writel(0, &regs->descriptors[i]);
1299 writel(0, &regs->UsbReady);
1300
1301 /* expect ep0 requests when the host drops reset */
1302 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1303 dev->int_enable = INT_DEVWIDE | INT_EP0;
1304 writel(dev->int_enable, &dev->regs->int_enable);
1305 readl(&regs->int_enable);
1306 dev->gadget.speed = USB_SPEED_FULL;
1307 dev->ep0state = EP0_IDLE;
1308 }
1309
1310 static void udc_enable(struct goku_udc *dev)
1311 {
1312 /* start enumeration now, or after power detect irq */
1313 if (readl(&dev->regs->power_detect) & PW_DETECT)
1314 ep0_start(dev);
1315 else {
1316 DBG(dev, "%s\n", __func__);
1317 dev->int_enable = INT_PWRDETECT;
1318 writel(dev->int_enable, &dev->regs->int_enable);
1319 }
1320 }
1321
1322 /*-------------------------------------------------------------------------*/
1323
1324 /* keeping it simple:
1325 * - one bus driver, initted first;
1326 * - one function driver, initted second
1327 */
1328
1329 /* when a driver is successfully registered, it will receive
1330 * control requests including set_configuration(), which enables
1331 * non-control requests. then usb traffic follows until a
1332 * disconnect is reported. then a host may connect again, or
1333 * the driver might get unbound.
1334 */
1335 static int goku_udc_start(struct usb_gadget *g,
1336 struct usb_gadget_driver *driver)
1337 {
1338 struct goku_udc *dev = to_goku_udc(g);
1339
1340 /* hook up the driver */
1341 driver->driver.bus = NULL;
1342 dev->driver = driver;
1343
1344 /*
1345 * then enable host detection and ep0; and we're ready
1346 * for set_configuration as well as eventual disconnect.
1347 */
1348 udc_enable(dev);
1349
1350 return 0;
1351 }
1352
1353 static void
1354 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1355 {
1356 unsigned i;
1357
1358 DBG (dev, "%s\n", __func__);
1359
1360 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1361 driver = NULL;
1362
1363 /* disconnect gadget driver after quiesceing hw and the driver */
1364 udc_reset (dev);
1365 for (i = 0; i < 4; i++)
1366 nuke(&dev->ep [i], -ESHUTDOWN);
1367
1368 if (dev->driver)
1369 udc_enable(dev);
1370 }
1371
1372 static int goku_udc_stop(struct usb_gadget *g,
1373 struct usb_gadget_driver *driver)
1374 {
1375 struct goku_udc *dev = to_goku_udc(g);
1376 unsigned long flags;
1377
1378 spin_lock_irqsave(&dev->lock, flags);
1379 dev->driver = NULL;
1380 stop_activity(dev, driver);
1381 spin_unlock_irqrestore(&dev->lock, flags);
1382
1383 return 0;
1384 }
1385
1386 /*-------------------------------------------------------------------------*/
1387
1388 static void ep0_setup(struct goku_udc *dev)
1389 {
1390 struct goku_udc_regs __iomem *regs = dev->regs;
1391 struct usb_ctrlrequest ctrl;
1392 int tmp;
1393
1394 /* read SETUP packet and enter DATA stage */
1395 ctrl.bRequestType = readl(&regs->bRequestType);
1396 ctrl.bRequest = readl(&regs->bRequest);
1397 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1398 | readl(&regs->wValueL));
1399 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1400 | readl(&regs->wIndexL));
1401 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1402 | readl(&regs->wLengthL));
1403 writel(0, &regs->SetupRecv);
1404
1405 nuke(&dev->ep[0], 0);
1406 dev->ep[0].stopped = 0;
1407 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1408 dev->ep[0].is_in = 1;
1409 dev->ep0state = EP0_IN;
1410 /* detect early status stages */
1411 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1412 } else {
1413 dev->ep[0].is_in = 0;
1414 dev->ep0state = EP0_OUT;
1415
1416 /* NOTE: CLEAR_FEATURE is done in software so that we can
1417 * synchronize transfer restarts after bulk IN stalls. data
1418 * won't even enter the fifo until the halt is cleared.
1419 */
1420 switch (ctrl.bRequest) {
1421 case USB_REQ_CLEAR_FEATURE:
1422 switch (ctrl.bRequestType) {
1423 case USB_RECIP_ENDPOINT:
1424 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1425 /* active endpoint */
1426 if (tmp > 3 ||
1427 (!dev->ep[tmp].ep.desc && tmp != 0))
1428 goto stall;
1429 if (ctrl.wIndex & cpu_to_le16(
1430 USB_DIR_IN)) {
1431 if (!dev->ep[tmp].is_in)
1432 goto stall;
1433 } else {
1434 if (dev->ep[tmp].is_in)
1435 goto stall;
1436 }
1437 if (ctrl.wValue != cpu_to_le16(
1438 USB_ENDPOINT_HALT))
1439 goto stall;
1440 if (tmp)
1441 goku_clear_halt(&dev->ep[tmp]);
1442 succeed:
1443 /* start ep0out status stage */
1444 writel(~(1<<0), &regs->EOP);
1445 dev->ep[0].stopped = 1;
1446 dev->ep0state = EP0_STATUS;
1447 return;
1448 case USB_RECIP_DEVICE:
1449 /* device remote wakeup: always clear */
1450 if (ctrl.wValue != cpu_to_le16(1))
1451 goto stall;
1452 VDBG(dev, "clear dev remote wakeup\n");
1453 goto succeed;
1454 case USB_RECIP_INTERFACE:
1455 goto stall;
1456 default: /* pass to gadget driver */
1457 break;
1458 }
1459 break;
1460 default:
1461 break;
1462 }
1463 }
1464
1465 #ifdef USB_TRACE
1466 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1467 ctrl.bRequestType, ctrl.bRequest,
1468 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1469 le16_to_cpu(ctrl.wLength));
1470 #endif
1471
1472 /* hw wants to know when we're configured (or not) */
1473 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1474 && ctrl.bRequestType == USB_RECIP_DEVICE);
1475 if (unlikely(dev->req_config))
1476 dev->configured = (ctrl.wValue != cpu_to_le16(0));
1477
1478 /* delegate everything to the gadget driver.
1479 * it may respond after this irq handler returns.
1480 */
1481 spin_unlock (&dev->lock);
1482 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1483 spin_lock (&dev->lock);
1484 if (unlikely(tmp < 0)) {
1485 stall:
1486 #ifdef USB_TRACE
1487 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1488 ctrl.bRequestType, ctrl.bRequest, tmp);
1489 #endif
1490 command(regs, COMMAND_STALL, 0);
1491 dev->ep[0].stopped = 1;
1492 dev->ep0state = EP0_STALL;
1493 }
1494
1495 /* expect at least one data or status stage irq */
1496 }
1497
1498 #define ACK(irqbit) { \
1499 stat &= ~irqbit; \
1500 writel(~irqbit, &regs->int_status); \
1501 handled = 1; \
1502 }
1503
1504 static irqreturn_t goku_irq(int irq, void *_dev)
1505 {
1506 struct goku_udc *dev = _dev;
1507 struct goku_udc_regs __iomem *regs = dev->regs;
1508 struct goku_ep *ep;
1509 u32 stat, handled = 0;
1510 unsigned i, rescans = 5;
1511
1512 spin_lock(&dev->lock);
1513
1514 rescan:
1515 stat = readl(&regs->int_status) & dev->int_enable;
1516 if (!stat)
1517 goto done;
1518 dev->irqs++;
1519
1520 /* device-wide irqs */
1521 if (unlikely(stat & INT_DEVWIDE)) {
1522 if (stat & INT_SYSERROR) {
1523 ERROR(dev, "system error\n");
1524 stop_activity(dev, dev->driver);
1525 stat = 0;
1526 handled = 1;
1527 // FIXME have a neater way to prevent re-enumeration
1528 dev->driver = NULL;
1529 goto done;
1530 }
1531 if (stat & INT_PWRDETECT) {
1532 writel(~stat, &regs->int_status);
1533 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1534 VDBG(dev, "connect\n");
1535 ep0_start(dev);
1536 } else {
1537 DBG(dev, "disconnect\n");
1538 if (dev->gadget.speed == USB_SPEED_FULL)
1539 stop_activity(dev, dev->driver);
1540 dev->ep0state = EP0_DISCONNECT;
1541 dev->int_enable = INT_DEVWIDE;
1542 writel(dev->int_enable, &dev->regs->int_enable);
1543 }
1544 stat = 0;
1545 handled = 1;
1546 goto done;
1547 }
1548 if (stat & INT_SUSPEND) {
1549 ACK(INT_SUSPEND);
1550 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1551 switch (dev->ep0state) {
1552 case EP0_DISCONNECT:
1553 case EP0_SUSPEND:
1554 goto pm_next;
1555 default:
1556 break;
1557 }
1558 DBG(dev, "USB suspend\n");
1559 dev->ep0state = EP0_SUSPEND;
1560 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1561 && dev->driver
1562 && dev->driver->suspend) {
1563 spin_unlock(&dev->lock);
1564 dev->driver->suspend(&dev->gadget);
1565 spin_lock(&dev->lock);
1566 }
1567 } else {
1568 if (dev->ep0state != EP0_SUSPEND) {
1569 DBG(dev, "bogus USB resume %d\n",
1570 dev->ep0state);
1571 goto pm_next;
1572 }
1573 DBG(dev, "USB resume\n");
1574 dev->ep0state = EP0_IDLE;
1575 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1576 && dev->driver
1577 && dev->driver->resume) {
1578 spin_unlock(&dev->lock);
1579 dev->driver->resume(&dev->gadget);
1580 spin_lock(&dev->lock);
1581 }
1582 }
1583 }
1584 pm_next:
1585 if (stat & INT_USBRESET) { /* hub reset done */
1586 ACK(INT_USBRESET);
1587 INFO(dev, "USB reset done, gadget %s\n",
1588 dev->driver->driver.name);
1589 }
1590 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1591 }
1592
1593 /* progress ep0 setup, data, or status stages.
1594 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1595 */
1596 if (stat & INT_SETUP) {
1597 ACK(INT_SETUP);
1598 dev->ep[0].irqs++;
1599 ep0_setup(dev);
1600 }
1601 if (stat & INT_STATUSNAK) {
1602 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1603 if (dev->ep0state == EP0_IN) {
1604 ep = &dev->ep[0];
1605 ep->irqs++;
1606 nuke(ep, 0);
1607 writel(~(1<<0), &regs->EOP);
1608 dev->ep0state = EP0_STATUS;
1609 }
1610 }
1611 if (stat & INT_ENDPOINT0) {
1612 ACK(INT_ENDPOINT0);
1613 ep = &dev->ep[0];
1614 ep->irqs++;
1615 pio_advance(ep);
1616 }
1617
1618 /* dma completion */
1619 if (stat & INT_MSTRDEND) { /* IN */
1620 ACK(INT_MSTRDEND);
1621 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1622 ep->irqs++;
1623 dma_advance(dev, ep);
1624 }
1625 if (stat & INT_MSTWREND) { /* OUT */
1626 ACK(INT_MSTWREND);
1627 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1628 ep->irqs++;
1629 dma_advance(dev, ep);
1630 }
1631 if (stat & INT_MSTWRTMOUT) { /* OUT */
1632 ACK(INT_MSTWRTMOUT);
1633 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1634 ep->irqs++;
1635 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1636 // reset dma? then dma_advance()
1637 }
1638
1639 /* pio */
1640 for (i = 1; i < 4; i++) {
1641 u32 tmp = INT_EPxDATASET(i);
1642
1643 if (!(stat & tmp))
1644 continue;
1645 ep = &dev->ep[i];
1646 pio_advance(ep);
1647 if (list_empty (&ep->queue))
1648 pio_irq_disable(dev, regs, i);
1649 stat &= ~tmp;
1650 handled = 1;
1651 ep->irqs++;
1652 }
1653
1654 if (rescans--)
1655 goto rescan;
1656
1657 done:
1658 (void)readl(&regs->int_enable);
1659 spin_unlock(&dev->lock);
1660 if (stat)
1661 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1662 readl(&regs->int_status), dev->int_enable);
1663 return IRQ_RETVAL(handled);
1664 }
1665
1666 #undef ACK
1667
1668 /*-------------------------------------------------------------------------*/
1669
1670 static void gadget_release(struct device *_dev)
1671 {
1672 struct goku_udc *dev = dev_get_drvdata(_dev);
1673
1674 kfree(dev);
1675 }
1676
1677 /* tear down the binding between this driver and the pci device */
1678
1679 static void goku_remove(struct pci_dev *pdev)
1680 {
1681 struct goku_udc *dev = pci_get_drvdata(pdev);
1682
1683 DBG(dev, "%s\n", __func__);
1684
1685 usb_del_gadget_udc(&dev->gadget);
1686
1687 BUG_ON(dev->driver);
1688
1689 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1690 remove_proc_entry(proc_node_name, NULL);
1691 #endif
1692 if (dev->regs)
1693 udc_reset(dev);
1694 if (dev->got_irq)
1695 free_irq(pdev->irq, dev);
1696 if (dev->regs)
1697 iounmap(dev->regs);
1698 if (dev->got_region)
1699 release_mem_region(pci_resource_start (pdev, 0),
1700 pci_resource_len (pdev, 0));
1701 if (dev->enabled)
1702 pci_disable_device(pdev);
1703
1704 pci_set_drvdata(pdev, NULL);
1705 dev->regs = NULL;
1706
1707 INFO(dev, "unbind\n");
1708 }
1709
1710 /* wrap this driver around the specified pci device, but
1711 * don't respond over USB until a gadget driver binds to us.
1712 */
1713
1714 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1715 {
1716 struct goku_udc *dev = NULL;
1717 unsigned long resource, len;
1718 void __iomem *base = NULL;
1719 int retval;
1720
1721 if (!pdev->irq) {
1722 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1723 retval = -ENODEV;
1724 goto err;
1725 }
1726
1727 /* alloc, and start init */
1728 dev = kzalloc (sizeof *dev, GFP_KERNEL);
1729 if (dev == NULL){
1730 pr_debug("enomem %s\n", pci_name(pdev));
1731 retval = -ENOMEM;
1732 goto err;
1733 }
1734
1735 spin_lock_init(&dev->lock);
1736 dev->pdev = pdev;
1737 dev->gadget.ops = &goku_ops;
1738 dev->gadget.max_speed = USB_SPEED_FULL;
1739
1740 /* the "gadget" abstracts/virtualizes the controller */
1741 dev->gadget.name = driver_name;
1742
1743 /* now all the pci goodies ... */
1744 retval = pci_enable_device(pdev);
1745 if (retval < 0) {
1746 DBG(dev, "can't enable, %d\n", retval);
1747 goto err;
1748 }
1749 dev->enabled = 1;
1750
1751 resource = pci_resource_start(pdev, 0);
1752 len = pci_resource_len(pdev, 0);
1753 if (!request_mem_region(resource, len, driver_name)) {
1754 DBG(dev, "controller already in use\n");
1755 retval = -EBUSY;
1756 goto err;
1757 }
1758 dev->got_region = 1;
1759
1760 base = ioremap_nocache(resource, len);
1761 if (base == NULL) {
1762 DBG(dev, "can't map memory\n");
1763 retval = -EFAULT;
1764 goto err;
1765 }
1766 dev->regs = (struct goku_udc_regs __iomem *) base;
1767
1768 pci_set_drvdata(pdev, dev);
1769 INFO(dev, "%s\n", driver_desc);
1770 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1771 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1772
1773 /* init to known state, then setup irqs */
1774 udc_reset(dev);
1775 udc_reinit (dev);
1776 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED,
1777 driver_name, dev) != 0) {
1778 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1779 retval = -EBUSY;
1780 goto err;
1781 }
1782 dev->got_irq = 1;
1783 if (use_dma)
1784 pci_set_master(pdev);
1785
1786
1787 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1788 proc_create_data(proc_node_name, 0, NULL, &udc_proc_fops, dev);
1789 #endif
1790
1791 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
1792 gadget_release);
1793 if (retval)
1794 goto err;
1795
1796 return 0;
1797
1798 err:
1799 if (dev)
1800 goku_remove (pdev);
1801 return retval;
1802 }
1803
1804
1805 /*-------------------------------------------------------------------------*/
1806
1807 static const struct pci_device_id pci_ids[] = { {
1808 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1809 .class_mask = ~0,
1810 .vendor = 0x102f, /* Toshiba */
1811 .device = 0x0107, /* this UDC */
1812 .subvendor = PCI_ANY_ID,
1813 .subdevice = PCI_ANY_ID,
1814
1815 }, { /* end: all zeroes */ }
1816 };
1817 MODULE_DEVICE_TABLE (pci, pci_ids);
1818
1819 static struct pci_driver goku_pci_driver = {
1820 .name = (char *) driver_name,
1821 .id_table = pci_ids,
1822
1823 .probe = goku_probe,
1824 .remove = goku_remove,
1825
1826 /* FIXME add power management support */
1827 };
1828
1829 module_pci_driver(goku_pci_driver);
Linus' kernel tree