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[deliverable/linux.git] / drivers / usb / gadget / goku_udc.c
1 /*
2 * Toshiba TC86C001 ("Goku-S") USB Device Controller driver
3 *
4 * Copyright (C) 2000-2002 Lineo
5 * by Stuart Lynne, Tom Rushworth, and Bruce Balden
6 * Copyright (C) 2002 Toshiba Corporation
7 * Copyright (C) 2003 MontaVista Software (source@mvista.com)
8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 */
13
14 /*
15 * This device has ep0 and three semi-configurable bulk/interrupt endpoints.
16 *
17 * - Endpoint numbering is fixed: ep{1,2,3}-bulk
18 * - Gadget drivers can choose ep maxpacket (8/16/32/64)
19 * - Gadget drivers can choose direction (IN, OUT)
20 * - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
21 */
22
23 // #define VERBOSE /* extra debug messages (success too) */
24 // #define USB_TRACE /* packet-level success messages */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/pci.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/timer.h>
34 #include <linux/list.h>
35 #include <linux/interrupt.h>
36 #include <linux/proc_fs.h>
37 #include <linux/seq_file.h>
38 #include <linux/device.h>
39 #include <linux/usb/ch9.h>
40 #include <linux/usb/gadget.h>
41 #include <linux/prefetch.h>
42
43 #include <asm/byteorder.h>
44 #include <asm/io.h>
45 #include <asm/irq.h>
46 #include <asm/unaligned.h>
47
48
49 #include "goku_udc.h"
50
51 #define DRIVER_DESC "TC86C001 USB Device Controller"
52 #define DRIVER_VERSION "30-Oct 2003"
53
54 static const char driver_name [] = "goku_udc";
55 static const char driver_desc [] = DRIVER_DESC;
56
57 MODULE_AUTHOR("source@mvista.com");
58 MODULE_DESCRIPTION(DRIVER_DESC);
59 MODULE_LICENSE("GPL");
60
61
62 /*
63 * IN dma behaves ok under testing, though the IN-dma abort paths don't
64 * seem to behave quite as expected. Used by default.
65 *
66 * OUT dma documents design problems handling the common "short packet"
67 * transfer termination policy; it couldn't be enabled by default, even
68 * if the OUT-dma abort problems had a resolution.
69 */
70 static unsigned use_dma = 1;
71
72 #if 0
73 //#include <linux/moduleparam.h>
74 /* "modprobe goku_udc use_dma=1" etc
75 * 0 to disable dma
76 * 1 to use IN dma only (normal operation)
77 * 2 to use IN and OUT dma
78 */
79 module_param(use_dma, uint, S_IRUGO);
80 #endif
81
82 /*-------------------------------------------------------------------------*/
83
84 static void nuke(struct goku_ep *, int status);
85
86 static inline void
87 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
88 {
89 writel(COMMAND_EP(epnum) | command, &regs->Command);
90 udelay(300);
91 }
92
93 static int
94 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
95 {
96 struct goku_udc *dev;
97 struct goku_ep *ep;
98 u32 mode;
99 u16 max;
100 unsigned long flags;
101
102 ep = container_of(_ep, struct goku_ep, ep);
103 if (!_ep || !desc
104 || desc->bDescriptorType != USB_DT_ENDPOINT)
105 return -EINVAL;
106 dev = ep->dev;
107 if (ep == &dev->ep[0])
108 return -EINVAL;
109 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
110 return -ESHUTDOWN;
111 if (ep->num != usb_endpoint_num(desc))
112 return -EINVAL;
113
114 switch (usb_endpoint_type(desc)) {
115 case USB_ENDPOINT_XFER_BULK:
116 case USB_ENDPOINT_XFER_INT:
117 break;
118 default:
119 return -EINVAL;
120 }
121
122 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
123 != EPxSTATUS_EP_INVALID)
124 return -EBUSY;
125
126 /* enabling the no-toggle interrupt mode would need an api hook */
127 mode = 0;
128 max = get_unaligned_le16(&desc->wMaxPacketSize);
129 switch (max) {
130 case 64: mode++;
131 case 32: mode++;
132 case 16: mode++;
133 case 8: mode <<= 3;
134 break;
135 default:
136 return -EINVAL;
137 }
138 mode |= 2 << 1; /* bulk, or intr-with-toggle */
139
140 /* ep1/ep2 dma direction is chosen early; it works in the other
141 * direction, with pio. be cautious with out-dma.
142 */
143 ep->is_in = usb_endpoint_dir_in(desc);
144 if (ep->is_in) {
145 mode |= 1;
146 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
147 } else {
148 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
149 if (ep->dma)
150 DBG(dev, "%s out-dma hides short packets\n",
151 ep->ep.name);
152 }
153
154 spin_lock_irqsave(&ep->dev->lock, flags);
155
156 /* ep1 and ep2 can do double buffering and/or dma */
157 if (ep->num < 3) {
158 struct goku_udc_regs __iomem *regs = ep->dev->regs;
159 u32 tmp;
160
161 /* double buffer except (for now) with pio in */
162 tmp = ((ep->dma || !ep->is_in)
163 ? 0x10 /* double buffered */
164 : 0x11 /* single buffer */
165 ) << ep->num;
166 tmp |= readl(&regs->EPxSingle);
167 writel(tmp, &regs->EPxSingle);
168
169 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
170 tmp |= readl(&regs->EPxBCS);
171 writel(tmp, &regs->EPxBCS);
172 }
173 writel(mode, ep->reg_mode);
174 command(ep->dev->regs, COMMAND_RESET, ep->num);
175 ep->ep.maxpacket = max;
176 ep->stopped = 0;
177 ep->ep.desc = desc;
178 spin_unlock_irqrestore(&ep->dev->lock, flags);
179
180 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
181 ep->is_in ? "IN" : "OUT",
182 ep->dma ? "dma" : "pio",
183 max);
184
185 return 0;
186 }
187
188 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
189 {
190 struct goku_udc *dev = ep->dev;
191
192 if (regs) {
193 command(regs, COMMAND_INVALID, ep->num);
194 if (ep->num) {
195 if (ep->num == UDC_MSTWR_ENDPOINT)
196 dev->int_enable &= ~(INT_MSTWREND
197 |INT_MSTWRTMOUT);
198 else if (ep->num == UDC_MSTRD_ENDPOINT)
199 dev->int_enable &= ~INT_MSTRDEND;
200 dev->int_enable &= ~INT_EPxDATASET (ep->num);
201 } else
202 dev->int_enable &= ~INT_EP0;
203 writel(dev->int_enable, &regs->int_enable);
204 readl(&regs->int_enable);
205 if (ep->num < 3) {
206 struct goku_udc_regs __iomem *r = ep->dev->regs;
207 u32 tmp;
208
209 tmp = readl(&r->EPxSingle);
210 tmp &= ~(0x11 << ep->num);
211 writel(tmp, &r->EPxSingle);
212
213 tmp = readl(&r->EPxBCS);
214 tmp &= ~(0x11 << ep->num);
215 writel(tmp, &r->EPxBCS);
216 }
217 /* reset dma in case we're still using it */
218 if (ep->dma) {
219 u32 master;
220
221 master = readl(&regs->dma_master) & MST_RW_BITS;
222 if (ep->num == UDC_MSTWR_ENDPOINT) {
223 master &= ~MST_W_BITS;
224 master |= MST_WR_RESET;
225 } else {
226 master &= ~MST_R_BITS;
227 master |= MST_RD_RESET;
228 }
229 writel(master, &regs->dma_master);
230 }
231 }
232
233 usb_ep_set_maxpacket_limit(&ep->ep, MAX_FIFO_SIZE);
234 ep->ep.desc = NULL;
235 ep->stopped = 1;
236 ep->irqs = 0;
237 ep->dma = 0;
238 }
239
240 static int goku_ep_disable(struct usb_ep *_ep)
241 {
242 struct goku_ep *ep;
243 struct goku_udc *dev;
244 unsigned long flags;
245
246 ep = container_of(_ep, struct goku_ep, ep);
247 if (!_ep || !ep->ep.desc)
248 return -ENODEV;
249 dev = ep->dev;
250 if (dev->ep0state == EP0_SUSPEND)
251 return -EBUSY;
252
253 VDBG(dev, "disable %s\n", _ep->name);
254
255 spin_lock_irqsave(&dev->lock, flags);
256 nuke(ep, -ESHUTDOWN);
257 ep_reset(dev->regs, ep);
258 spin_unlock_irqrestore(&dev->lock, flags);
259
260 return 0;
261 }
262
263 /*-------------------------------------------------------------------------*/
264
265 static struct usb_request *
266 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
267 {
268 struct goku_request *req;
269
270 if (!_ep)
271 return NULL;
272 req = kzalloc(sizeof *req, gfp_flags);
273 if (!req)
274 return NULL;
275
276 INIT_LIST_HEAD(&req->queue);
277 return &req->req;
278 }
279
280 static void
281 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
282 {
283 struct goku_request *req;
284
285 if (!_ep || !_req)
286 return;
287
288 req = container_of(_req, struct goku_request, req);
289 WARN_ON(!list_empty(&req->queue));
290 kfree(req);
291 }
292
293 /*-------------------------------------------------------------------------*/
294
295 static void
296 done(struct goku_ep *ep, struct goku_request *req, int status)
297 {
298 struct goku_udc *dev;
299 unsigned stopped = ep->stopped;
300
301 list_del_init(&req->queue);
302
303 if (likely(req->req.status == -EINPROGRESS))
304 req->req.status = status;
305 else
306 status = req->req.status;
307
308 dev = ep->dev;
309
310 if (ep->dma)
311 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
312
313 #ifndef USB_TRACE
314 if (status && status != -ESHUTDOWN)
315 #endif
316 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
317 ep->ep.name, &req->req, status,
318 req->req.actual, req->req.length);
319
320 /* don't modify queue heads during completion callback */
321 ep->stopped = 1;
322 spin_unlock(&dev->lock);
323 req->req.complete(&ep->ep, &req->req);
324 spin_lock(&dev->lock);
325 ep->stopped = stopped;
326 }
327
328 /*-------------------------------------------------------------------------*/
329
330 static inline int
331 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
332 {
333 unsigned length, count;
334
335 length = min(req->req.length - req->req.actual, max);
336 req->req.actual += length;
337
338 count = length;
339 while (likely(count--))
340 writel(*buf++, fifo);
341 return length;
342 }
343
344 // return: 0 = still running, 1 = completed, negative = errno
345 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
346 {
347 struct goku_udc *dev = ep->dev;
348 u32 tmp;
349 u8 *buf;
350 unsigned count;
351 int is_last;
352
353 tmp = readl(&dev->regs->DataSet);
354 buf = req->req.buf + req->req.actual;
355 prefetch(buf);
356
357 dev = ep->dev;
358 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
359 return -EL2HLT;
360
361 /* NOTE: just single-buffered PIO-IN for now. */
362 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
363 return 0;
364
365 /* clear our "packet available" irq */
366 if (ep->num != 0)
367 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
368
369 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
370
371 /* last packet often short (sometimes a zlp, especially on ep0) */
372 if (unlikely(count != ep->ep.maxpacket)) {
373 writel(~(1<<ep->num), &dev->regs->EOP);
374 if (ep->num == 0) {
375 dev->ep[0].stopped = 1;
376 dev->ep0state = EP0_STATUS;
377 }
378 is_last = 1;
379 } else {
380 if (likely(req->req.length != req->req.actual)
381 || req->req.zero)
382 is_last = 0;
383 else
384 is_last = 1;
385 }
386 #if 0 /* printk seemed to trash is_last...*/
387 //#ifdef USB_TRACE
388 VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
389 ep->ep.name, count, is_last ? "/last" : "",
390 req->req.length - req->req.actual, req);
391 #endif
392
393 /* requests complete when all IN data is in the FIFO,
394 * or sometimes later, if a zlp was needed.
395 */
396 if (is_last) {
397 done(ep, req, 0);
398 return 1;
399 }
400
401 return 0;
402 }
403
404 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
405 {
406 struct goku_udc_regs __iomem *regs;
407 u32 size, set;
408 u8 *buf;
409 unsigned bufferspace, is_short, dbuff;
410
411 regs = ep->dev->regs;
412 top:
413 buf = req->req.buf + req->req.actual;
414 prefetchw(buf);
415
416 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
417 return -EL2HLT;
418
419 dbuff = (ep->num == 1 || ep->num == 2);
420 do {
421 /* ack dataset irq matching the status we'll handle */
422 if (ep->num != 0)
423 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
424
425 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
426 size = readl(&regs->EPxSizeLA[ep->num]);
427 bufferspace = req->req.length - req->req.actual;
428
429 /* usually do nothing without an OUT packet */
430 if (likely(ep->num != 0 || bufferspace != 0)) {
431 if (unlikely(set == 0))
432 break;
433 /* use ep1/ep2 double-buffering for OUT */
434 if (!(size & PACKET_ACTIVE))
435 size = readl(&regs->EPxSizeLB[ep->num]);
436 if (!(size & PACKET_ACTIVE)) /* "can't happen" */
437 break;
438 size &= DATASIZE; /* EPxSizeH == 0 */
439
440 /* ep0out no-out-data case for set_config, etc */
441 } else
442 size = 0;
443
444 /* read all bytes from this packet */
445 req->req.actual += size;
446 is_short = (size < ep->ep.maxpacket);
447 #ifdef USB_TRACE
448 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
449 ep->ep.name, size, is_short ? "/S" : "",
450 req, req->req.actual, req->req.length);
451 #endif
452 while (likely(size-- != 0)) {
453 u8 byte = (u8) readl(ep->reg_fifo);
454
455 if (unlikely(bufferspace == 0)) {
456 /* this happens when the driver's buffer
457 * is smaller than what the host sent.
458 * discard the extra data in this packet.
459 */
460 if (req->req.status != -EOVERFLOW)
461 DBG(ep->dev, "%s overflow %u\n",
462 ep->ep.name, size);
463 req->req.status = -EOVERFLOW;
464 } else {
465 *buf++ = byte;
466 bufferspace--;
467 }
468 }
469
470 /* completion */
471 if (unlikely(is_short || req->req.actual == req->req.length)) {
472 if (unlikely(ep->num == 0)) {
473 /* non-control endpoints now usable? */
474 if (ep->dev->req_config)
475 writel(ep->dev->configured
476 ? USBSTATE_CONFIGURED
477 : 0,
478 &regs->UsbState);
479 /* ep0out status stage */
480 writel(~(1<<0), &regs->EOP);
481 ep->stopped = 1;
482 ep->dev->ep0state = EP0_STATUS;
483 }
484 done(ep, req, 0);
485
486 /* empty the second buffer asap */
487 if (dbuff && !list_empty(&ep->queue)) {
488 req = list_entry(ep->queue.next,
489 struct goku_request, queue);
490 goto top;
491 }
492 return 1;
493 }
494 } while (dbuff);
495 return 0;
496 }
497
498 static inline void
499 pio_irq_enable(struct goku_udc *dev,
500 struct goku_udc_regs __iomem *regs, int epnum)
501 {
502 dev->int_enable |= INT_EPxDATASET (epnum);
503 writel(dev->int_enable, &regs->int_enable);
504 /* write may still be posted */
505 }
506
507 static inline void
508 pio_irq_disable(struct goku_udc *dev,
509 struct goku_udc_regs __iomem *regs, int epnum)
510 {
511 dev->int_enable &= ~INT_EPxDATASET (epnum);
512 writel(dev->int_enable, &regs->int_enable);
513 /* write may still be posted */
514 }
515
516 static inline void
517 pio_advance(struct goku_ep *ep)
518 {
519 struct goku_request *req;
520
521 if (unlikely(list_empty (&ep->queue)))
522 return;
523 req = list_entry(ep->queue.next, struct goku_request, queue);
524 (ep->is_in ? write_fifo : read_fifo)(ep, req);
525 }
526
527
528 /*-------------------------------------------------------------------------*/
529
530 // return: 0 = q running, 1 = q stopped, negative = errno
531 static int start_dma(struct goku_ep *ep, struct goku_request *req)
532 {
533 struct goku_udc_regs __iomem *regs = ep->dev->regs;
534 u32 master;
535 u32 start = req->req.dma;
536 u32 end = start + req->req.length - 1;
537
538 master = readl(&regs->dma_master) & MST_RW_BITS;
539
540 /* re-init the bits affecting IN dma; careful with zlps */
541 if (likely(ep->is_in)) {
542 if (unlikely(master & MST_RD_ENA)) {
543 DBG (ep->dev, "start, IN active dma %03x!!\n",
544 master);
545 // return -EL2HLT;
546 }
547 writel(end, &regs->in_dma_end);
548 writel(start, &regs->in_dma_start);
549
550 master &= ~MST_R_BITS;
551 if (unlikely(req->req.length == 0))
552 master = MST_RD_ENA | MST_RD_EOPB;
553 else if ((req->req.length % ep->ep.maxpacket) != 0
554 || req->req.zero)
555 master = MST_RD_ENA | MST_EOPB_ENA;
556 else
557 master = MST_RD_ENA | MST_EOPB_DIS;
558
559 ep->dev->int_enable |= INT_MSTRDEND;
560
561 /* Goku DMA-OUT merges short packets, which plays poorly with
562 * protocols where short packets mark the transfer boundaries.
563 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
564 * ending transfers after 3 SOFs; we don't turn it on.
565 */
566 } else {
567 if (unlikely(master & MST_WR_ENA)) {
568 DBG (ep->dev, "start, OUT active dma %03x!!\n",
569 master);
570 // return -EL2HLT;
571 }
572 writel(end, &regs->out_dma_end);
573 writel(start, &regs->out_dma_start);
574
575 master &= ~MST_W_BITS;
576 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
577
578 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
579 }
580
581 writel(master, &regs->dma_master);
582 writel(ep->dev->int_enable, &regs->int_enable);
583 return 0;
584 }
585
586 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
587 {
588 struct goku_request *req;
589 struct goku_udc_regs __iomem *regs = ep->dev->regs;
590 u32 master;
591
592 master = readl(&regs->dma_master);
593
594 if (unlikely(list_empty(&ep->queue))) {
595 stop:
596 if (ep->is_in)
597 dev->int_enable &= ~INT_MSTRDEND;
598 else
599 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
600 writel(dev->int_enable, &regs->int_enable);
601 return;
602 }
603 req = list_entry(ep->queue.next, struct goku_request, queue);
604
605 /* normal hw dma completion (not abort) */
606 if (likely(ep->is_in)) {
607 if (unlikely(master & MST_RD_ENA))
608 return;
609 req->req.actual = readl(&regs->in_dma_current);
610 } else {
611 if (unlikely(master & MST_WR_ENA))
612 return;
613
614 /* hardware merges short packets, and also hides packet
615 * overruns. a partial packet MAY be in the fifo here.
616 */
617 req->req.actual = readl(&regs->out_dma_current);
618 }
619 req->req.actual -= req->req.dma;
620 req->req.actual++;
621
622 #ifdef USB_TRACE
623 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
624 ep->ep.name, ep->is_in ? "IN" : "OUT",
625 req->req.actual, req->req.length, req);
626 #endif
627 done(ep, req, 0);
628 if (list_empty(&ep->queue))
629 goto stop;
630 req = list_entry(ep->queue.next, struct goku_request, queue);
631 (void) start_dma(ep, req);
632 }
633
634 static void abort_dma(struct goku_ep *ep, int status)
635 {
636 struct goku_udc_regs __iomem *regs = ep->dev->regs;
637 struct goku_request *req;
638 u32 curr, master;
639
640 /* NAK future host requests, hoping the implicit delay lets the
641 * dma engine finish reading (or writing) its latest packet and
642 * empty the dma buffer (up to 16 bytes).
643 *
644 * This avoids needing to clean up a partial packet in the fifo;
645 * we can't do that for IN without side effects to HALT and TOGGLE.
646 */
647 command(regs, COMMAND_FIFO_DISABLE, ep->num);
648 req = list_entry(ep->queue.next, struct goku_request, queue);
649 master = readl(&regs->dma_master) & MST_RW_BITS;
650
651 /* FIXME using these resets isn't usably documented. this may
652 * not work unless it's followed by disabling the endpoint.
653 *
654 * FIXME the OUT reset path doesn't even behave consistently.
655 */
656 if (ep->is_in) {
657 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
658 goto finished;
659 curr = readl(&regs->in_dma_current);
660
661 writel(curr, &regs->in_dma_end);
662 writel(curr, &regs->in_dma_start);
663
664 master &= ~MST_R_BITS;
665 master |= MST_RD_RESET;
666 writel(master, &regs->dma_master);
667
668 if (readl(&regs->dma_master) & MST_RD_ENA)
669 DBG(ep->dev, "IN dma active after reset!\n");
670
671 } else {
672 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
673 goto finished;
674 curr = readl(&regs->out_dma_current);
675
676 writel(curr, &regs->out_dma_end);
677 writel(curr, &regs->out_dma_start);
678
679 master &= ~MST_W_BITS;
680 master |= MST_WR_RESET;
681 writel(master, &regs->dma_master);
682
683 if (readl(&regs->dma_master) & MST_WR_ENA)
684 DBG(ep->dev, "OUT dma active after reset!\n");
685 }
686 req->req.actual = (curr - req->req.dma) + 1;
687 req->req.status = status;
688
689 VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name,
690 ep->is_in ? "IN" : "OUT",
691 req->req.actual, req->req.length);
692
693 command(regs, COMMAND_FIFO_ENABLE, ep->num);
694
695 return;
696
697 finished:
698 /* dma already completed; no abort needed */
699 command(regs, COMMAND_FIFO_ENABLE, ep->num);
700 req->req.actual = req->req.length;
701 req->req.status = 0;
702 }
703
704 /*-------------------------------------------------------------------------*/
705
706 static int
707 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
708 {
709 struct goku_request *req;
710 struct goku_ep *ep;
711 struct goku_udc *dev;
712 unsigned long flags;
713 int status;
714
715 /* always require a cpu-view buffer so pio works */
716 req = container_of(_req, struct goku_request, req);
717 if (unlikely(!_req || !_req->complete
718 || !_req->buf || !list_empty(&req->queue)))
719 return -EINVAL;
720 ep = container_of(_ep, struct goku_ep, ep);
721 if (unlikely(!_ep || (!ep->ep.desc && ep->num != 0)))
722 return -EINVAL;
723 dev = ep->dev;
724 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
725 return -ESHUTDOWN;
726
727 /* can't touch registers when suspended */
728 if (dev->ep0state == EP0_SUSPEND)
729 return -EBUSY;
730
731 /* set up dma mapping in case the caller didn't */
732 if (ep->dma) {
733 status = usb_gadget_map_request(&dev->gadget, &req->req,
734 ep->is_in);
735 if (status)
736 return status;
737 }
738
739 #ifdef USB_TRACE
740 VDBG(dev, "%s queue req %p, len %u buf %p\n",
741 _ep->name, _req, _req->length, _req->buf);
742 #endif
743
744 spin_lock_irqsave(&dev->lock, flags);
745
746 _req->status = -EINPROGRESS;
747 _req->actual = 0;
748
749 /* for ep0 IN without premature status, zlp is required and
750 * writing EOP starts the status stage (OUT).
751 */
752 if (unlikely(ep->num == 0 && ep->is_in))
753 _req->zero = 1;
754
755 /* kickstart this i/o queue? */
756 status = 0;
757 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
758 /* dma: done after dma completion IRQ (or error)
759 * pio: done after last fifo operation
760 */
761 if (ep->dma)
762 status = start_dma(ep, req);
763 else
764 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
765
766 if (unlikely(status != 0)) {
767 if (status > 0)
768 status = 0;
769 req = NULL;
770 }
771
772 } /* else pio or dma irq handler advances the queue. */
773
774 if (likely(req != NULL))
775 list_add_tail(&req->queue, &ep->queue);
776
777 if (likely(!list_empty(&ep->queue))
778 && likely(ep->num != 0)
779 && !ep->dma
780 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
781 pio_irq_enable(dev, dev->regs, ep->num);
782
783 spin_unlock_irqrestore(&dev->lock, flags);
784
785 /* pci writes may still be posted */
786 return status;
787 }
788
789 /* dequeue ALL requests */
790 static void nuke(struct goku_ep *ep, int status)
791 {
792 struct goku_request *req;
793
794 ep->stopped = 1;
795 if (list_empty(&ep->queue))
796 return;
797 if (ep->dma)
798 abort_dma(ep, status);
799 while (!list_empty(&ep->queue)) {
800 req = list_entry(ep->queue.next, struct goku_request, queue);
801 done(ep, req, status);
802 }
803 }
804
805 /* dequeue JUST ONE request */
806 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
807 {
808 struct goku_request *req;
809 struct goku_ep *ep;
810 struct goku_udc *dev;
811 unsigned long flags;
812
813 ep = container_of(_ep, struct goku_ep, ep);
814 if (!_ep || !_req || (!ep->ep.desc && ep->num != 0))
815 return -EINVAL;
816 dev = ep->dev;
817 if (!dev->driver)
818 return -ESHUTDOWN;
819
820 /* we can't touch (dma) registers when suspended */
821 if (dev->ep0state == EP0_SUSPEND)
822 return -EBUSY;
823
824 VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name,
825 ep->is_in ? "IN" : "OUT",
826 ep->dma ? "dma" : "pio",
827 _req);
828
829 spin_lock_irqsave(&dev->lock, flags);
830
831 /* make sure it's actually queued on this endpoint */
832 list_for_each_entry (req, &ep->queue, queue) {
833 if (&req->req == _req)
834 break;
835 }
836 if (&req->req != _req) {
837 spin_unlock_irqrestore (&dev->lock, flags);
838 return -EINVAL;
839 }
840
841 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
842 abort_dma(ep, -ECONNRESET);
843 done(ep, req, -ECONNRESET);
844 dma_advance(dev, ep);
845 } else if (!list_empty(&req->queue))
846 done(ep, req, -ECONNRESET);
847 else
848 req = NULL;
849 spin_unlock_irqrestore(&dev->lock, flags);
850
851 return req ? 0 : -EOPNOTSUPP;
852 }
853
854 /*-------------------------------------------------------------------------*/
855
856 static void goku_clear_halt(struct goku_ep *ep)
857 {
858 // assert (ep->num !=0)
859 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
860 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
861 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
862 if (ep->stopped) {
863 ep->stopped = 0;
864 if (ep->dma) {
865 struct goku_request *req;
866
867 if (list_empty(&ep->queue))
868 return;
869 req = list_entry(ep->queue.next, struct goku_request,
870 queue);
871 (void) start_dma(ep, req);
872 } else
873 pio_advance(ep);
874 }
875 }
876
877 static int goku_set_halt(struct usb_ep *_ep, int value)
878 {
879 struct goku_ep *ep;
880 unsigned long flags;
881 int retval = 0;
882
883 if (!_ep)
884 return -ENODEV;
885 ep = container_of (_ep, struct goku_ep, ep);
886
887 if (ep->num == 0) {
888 if (value) {
889 ep->dev->ep0state = EP0_STALL;
890 ep->dev->ep[0].stopped = 1;
891 } else
892 return -EINVAL;
893
894 /* don't change EPxSTATUS_EP_INVALID to READY */
895 } else if (!ep->ep.desc) {
896 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
897 return -EINVAL;
898 }
899
900 spin_lock_irqsave(&ep->dev->lock, flags);
901 if (!list_empty(&ep->queue))
902 retval = -EAGAIN;
903 else if (ep->is_in && value
904 /* data in (either) packet buffer? */
905 && (readl(&ep->dev->regs->DataSet)
906 & DATASET_AB(ep->num)))
907 retval = -EAGAIN;
908 else if (!value)
909 goku_clear_halt(ep);
910 else {
911 ep->stopped = 1;
912 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
913 command(ep->dev->regs, COMMAND_STALL, ep->num);
914 readl(ep->reg_status);
915 }
916 spin_unlock_irqrestore(&ep->dev->lock, flags);
917 return retval;
918 }
919
920 static int goku_fifo_status(struct usb_ep *_ep)
921 {
922 struct goku_ep *ep;
923 struct goku_udc_regs __iomem *regs;
924 u32 size;
925
926 if (!_ep)
927 return -ENODEV;
928 ep = container_of(_ep, struct goku_ep, ep);
929
930 /* size is only reported sanely for OUT */
931 if (ep->is_in)
932 return -EOPNOTSUPP;
933
934 /* ignores 16-byte dma buffer; SizeH == 0 */
935 regs = ep->dev->regs;
936 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
937 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
938 VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size);
939 return size;
940 }
941
942 static void goku_fifo_flush(struct usb_ep *_ep)
943 {
944 struct goku_ep *ep;
945 struct goku_udc_regs __iomem *regs;
946 u32 size;
947
948 if (!_ep)
949 return;
950 ep = container_of(_ep, struct goku_ep, ep);
951 VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name);
952
953 /* don't change EPxSTATUS_EP_INVALID to READY */
954 if (!ep->ep.desc && ep->num != 0) {
955 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
956 return;
957 }
958
959 regs = ep->dev->regs;
960 size = readl(&regs->EPxSizeLA[ep->num]);
961 size &= DATASIZE;
962
963 /* Non-desirable behavior: FIFO_CLEAR also clears the
964 * endpoint halt feature. For OUT, we _could_ just read
965 * the bytes out (PIO, if !ep->dma); for in, no choice.
966 */
967 if (size)
968 command(regs, COMMAND_FIFO_CLEAR, ep->num);
969 }
970
971 static struct usb_ep_ops goku_ep_ops = {
972 .enable = goku_ep_enable,
973 .disable = goku_ep_disable,
974
975 .alloc_request = goku_alloc_request,
976 .free_request = goku_free_request,
977
978 .queue = goku_queue,
979 .dequeue = goku_dequeue,
980
981 .set_halt = goku_set_halt,
982 .fifo_status = goku_fifo_status,
983 .fifo_flush = goku_fifo_flush,
984 };
985
986 /*-------------------------------------------------------------------------*/
987
988 static int goku_get_frame(struct usb_gadget *_gadget)
989 {
990 return -EOPNOTSUPP;
991 }
992
993 static int goku_udc_start(struct usb_gadget *g,
994 struct usb_gadget_driver *driver);
995 static int goku_udc_stop(struct usb_gadget *g,
996 struct usb_gadget_driver *driver);
997
998 static const struct usb_gadget_ops goku_ops = {
999 .get_frame = goku_get_frame,
1000 .udc_start = goku_udc_start,
1001 .udc_stop = goku_udc_stop,
1002 // no remote wakeup
1003 // not selfpowered
1004 };
1005
1006 /*-------------------------------------------------------------------------*/
1007
1008 static inline const char *dmastr(void)
1009 {
1010 if (use_dma == 0)
1011 return "(dma disabled)";
1012 else if (use_dma == 2)
1013 return "(dma IN and OUT)";
1014 else
1015 return "(dma IN)";
1016 }
1017
1018 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1019
1020 static const char proc_node_name [] = "driver/udc";
1021
1022 #define FOURBITS "%s%s%s%s"
1023 #define EIGHTBITS FOURBITS FOURBITS
1024
1025 static void dump_intmask(struct seq_file *m, const char *label, u32 mask)
1026 {
1027 /* int_status is the same format ... */
1028 seq_printf(m,
1029 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1030 label, mask,
1031 (mask & INT_PWRDETECT) ? " power" : "",
1032 (mask & INT_SYSERROR) ? " sys" : "",
1033 (mask & INT_MSTRDEND) ? " in-dma" : "",
1034 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1035
1036 (mask & INT_MSTWREND) ? " out-dma" : "",
1037 (mask & INT_MSTWRSET) ? " wrset" : "",
1038 (mask & INT_ERR) ? " err" : "",
1039 (mask & INT_SOF) ? " sof" : "",
1040
1041 (mask & INT_EP3NAK) ? " ep3nak" : "",
1042 (mask & INT_EP2NAK) ? " ep2nak" : "",
1043 (mask & INT_EP1NAK) ? " ep1nak" : "",
1044 (mask & INT_EP3DATASET) ? " ep3" : "",
1045
1046 (mask & INT_EP2DATASET) ? " ep2" : "",
1047 (mask & INT_EP1DATASET) ? " ep1" : "",
1048 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1049 (mask & INT_STATUS) ? " ep0status" : "",
1050
1051 (mask & INT_SETUP) ? " setup" : "",
1052 (mask & INT_ENDPOINT0) ? " ep0" : "",
1053 (mask & INT_USBRESET) ? " reset" : "",
1054 (mask & INT_SUSPEND) ? " suspend" : "");
1055 }
1056
1057
1058 static int udc_proc_read(struct seq_file *m, void *v)
1059 {
1060 struct goku_udc *dev = m->private;
1061 struct goku_udc_regs __iomem *regs = dev->regs;
1062 unsigned long flags;
1063 int i, is_usb_connected;
1064 u32 tmp;
1065
1066 local_irq_save(flags);
1067
1068 /* basic device status */
1069 tmp = readl(&regs->power_detect);
1070 is_usb_connected = tmp & PW_DETECT;
1071 seq_printf(m,
1072 "%s - %s\n"
1073 "%s version: %s %s\n"
1074 "Gadget driver: %s\n"
1075 "Host %s, %s\n"
1076 "\n",
1077 pci_name(dev->pdev), driver_desc,
1078 driver_name, DRIVER_VERSION, dmastr(),
1079 dev->driver ? dev->driver->driver.name : "(none)",
1080 is_usb_connected
1081 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1082 : "disconnected",
1083 ({const char *state;
1084 switch(dev->ep0state){
1085 case EP0_DISCONNECT: state = "ep0_disconnect"; break;
1086 case EP0_IDLE: state = "ep0_idle"; break;
1087 case EP0_IN: state = "ep0_in"; break;
1088 case EP0_OUT: state = "ep0_out"; break;
1089 case EP0_STATUS: state = "ep0_status"; break;
1090 case EP0_STALL: state = "ep0_stall"; break;
1091 case EP0_SUSPEND: state = "ep0_suspend"; break;
1092 default: state = "ep0_?"; break;
1093 } state; })
1094 );
1095
1096 dump_intmask(m, "int_status", readl(&regs->int_status));
1097 dump_intmask(m, "int_enable", readl(&regs->int_enable));
1098
1099 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1100 goto done;
1101
1102 /* registers for (active) device and ep0 */
1103 if (seq_printf(m, "\nirqs %lu\ndataset %02x "
1104 "single.bcs %02x.%02x state %x addr %u\n",
1105 dev->irqs, readl(&regs->DataSet),
1106 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1107 readl(&regs->UsbState),
1108 readl(&regs->address)) < 0)
1109 goto done;
1110
1111 tmp = readl(&regs->dma_master);
1112 if (seq_printf(m,
1113 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1114 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1115 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1116 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1117 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1118
1119 (tmp & MST_RD_EOPB) ? " eopb" : "",
1120 (tmp & MST_RD_RESET) ? " in_reset" : "",
1121 (tmp & MST_WR_RESET) ? " out_reset" : "",
1122 (tmp & MST_RD_ENA) ? " IN" : "",
1123
1124 (tmp & MST_WR_ENA) ? " OUT" : "",
1125 (tmp & MST_CONNECTION)
1126 ? "ep1in/ep2out"
1127 : "ep1out/ep2in") < 0)
1128 goto done;
1129
1130 /* dump endpoint queues */
1131 for (i = 0; i < 4; i++) {
1132 struct goku_ep *ep = &dev->ep [i];
1133 struct goku_request *req;
1134
1135 if (i && !ep->ep.desc)
1136 continue;
1137
1138 tmp = readl(ep->reg_status);
1139 if (seq_printf(m,
1140 "%s %s max %u %s, irqs %lu, "
1141 "status %02x (%s) " FOURBITS "\n",
1142 ep->ep.name,
1143 ep->is_in ? "in" : "out",
1144 ep->ep.maxpacket,
1145 ep->dma ? "dma" : "pio",
1146 ep->irqs,
1147 tmp, ({ char *s;
1148 switch (tmp & EPxSTATUS_EP_MASK) {
1149 case EPxSTATUS_EP_READY:
1150 s = "ready"; break;
1151 case EPxSTATUS_EP_DATAIN:
1152 s = "packet"; break;
1153 case EPxSTATUS_EP_FULL:
1154 s = "full"; break;
1155 case EPxSTATUS_EP_TX_ERR: // host will retry
1156 s = "tx_err"; break;
1157 case EPxSTATUS_EP_RX_ERR:
1158 s = "rx_err"; break;
1159 case EPxSTATUS_EP_BUSY: /* ep0 only */
1160 s = "busy"; break;
1161 case EPxSTATUS_EP_STALL:
1162 s = "stall"; break;
1163 case EPxSTATUS_EP_INVALID: // these "can't happen"
1164 s = "invalid"; break;
1165 default:
1166 s = "?"; break;
1167 } s; }),
1168 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1169 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1170 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1171 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1172 ) < 0)
1173 goto done;
1174
1175 if (list_empty(&ep->queue)) {
1176 if (seq_puts(m, "\t(nothing queued)\n") < 0)
1177 goto done;
1178 continue;
1179 }
1180 list_for_each_entry(req, &ep->queue, queue) {
1181 if (ep->dma && req->queue.prev == &ep->queue) {
1182 if (i == UDC_MSTRD_ENDPOINT)
1183 tmp = readl(&regs->in_dma_current);
1184 else
1185 tmp = readl(&regs->out_dma_current);
1186 tmp -= req->req.dma;
1187 tmp++;
1188 } else
1189 tmp = req->req.actual;
1190
1191 if (seq_printf(m,
1192 "\treq %p len %u/%u buf %p\n",
1193 &req->req, tmp, req->req.length,
1194 req->req.buf) < 0)
1195 goto done;
1196 }
1197 }
1198
1199 done:
1200 local_irq_restore(flags);
1201 return 0;
1202 }
1203
1204 /*
1205 * seq_file wrappers for procfile show routines.
1206 */
1207 static int udc_proc_open(struct inode *inode, struct file *file)
1208 {
1209 return single_open(file, udc_proc_read, PDE_DATA(file_inode(file)));
1210 }
1211
1212 static const struct file_operations udc_proc_fops = {
1213 .open = udc_proc_open,
1214 .read = seq_read,
1215 .llseek = seq_lseek,
1216 .release = single_release,
1217 };
1218
1219 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1220
1221 /*-------------------------------------------------------------------------*/
1222
1223 static void udc_reinit (struct goku_udc *dev)
1224 {
1225 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1226
1227 unsigned i;
1228
1229 INIT_LIST_HEAD (&dev->gadget.ep_list);
1230 dev->gadget.ep0 = &dev->ep [0].ep;
1231 dev->gadget.speed = USB_SPEED_UNKNOWN;
1232 dev->ep0state = EP0_DISCONNECT;
1233 dev->irqs = 0;
1234
1235 for (i = 0; i < 4; i++) {
1236 struct goku_ep *ep = &dev->ep[i];
1237
1238 ep->num = i;
1239 ep->ep.name = names[i];
1240 ep->reg_fifo = &dev->regs->ep_fifo [i];
1241 ep->reg_status = &dev->regs->ep_status [i];
1242 ep->reg_mode = &dev->regs->ep_mode[i];
1243
1244 ep->ep.ops = &goku_ep_ops;
1245 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1246 ep->dev = dev;
1247 INIT_LIST_HEAD (&ep->queue);
1248
1249 ep_reset(NULL, ep);
1250 }
1251
1252 dev->ep[0].reg_mode = NULL;
1253 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, MAX_EP0_SIZE);
1254 list_del_init (&dev->ep[0].ep.ep_list);
1255 }
1256
1257 static void udc_reset(struct goku_udc *dev)
1258 {
1259 struct goku_udc_regs __iomem *regs = dev->regs;
1260
1261 writel(0, &regs->power_detect);
1262 writel(0, &regs->int_enable);
1263 readl(&regs->int_enable);
1264 dev->int_enable = 0;
1265
1266 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1267 * don't let INT_PWRDETECT sequence begin
1268 */
1269 udelay(250);
1270 writel(PW_RESETB, &regs->power_detect);
1271 readl(&regs->int_enable);
1272 }
1273
1274 static void ep0_start(struct goku_udc *dev)
1275 {
1276 struct goku_udc_regs __iomem *regs = dev->regs;
1277 unsigned i;
1278
1279 VDBG(dev, "%s\n", __func__);
1280
1281 udc_reset(dev);
1282 udc_reinit (dev);
1283 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1284
1285 /* hw handles set_address, set_feature, get_status; maybe more */
1286 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1287 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1288 | G_REQMODE_GET_DESC
1289 | G_REQMODE_CLEAR_FEAT
1290 , &regs->reqmode);
1291
1292 for (i = 0; i < 4; i++)
1293 dev->ep[i].irqs = 0;
1294
1295 /* can't modify descriptors after writing UsbReady */
1296 for (i = 0; i < DESC_LEN; i++)
1297 writel(0, &regs->descriptors[i]);
1298 writel(0, &regs->UsbReady);
1299
1300 /* expect ep0 requests when the host drops reset */
1301 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1302 dev->int_enable = INT_DEVWIDE | INT_EP0;
1303 writel(dev->int_enable, &dev->regs->int_enable);
1304 readl(&regs->int_enable);
1305 dev->gadget.speed = USB_SPEED_FULL;
1306 dev->ep0state = EP0_IDLE;
1307 }
1308
1309 static void udc_enable(struct goku_udc *dev)
1310 {
1311 /* start enumeration now, or after power detect irq */
1312 if (readl(&dev->regs->power_detect) & PW_DETECT)
1313 ep0_start(dev);
1314 else {
1315 DBG(dev, "%s\n", __func__);
1316 dev->int_enable = INT_PWRDETECT;
1317 writel(dev->int_enable, &dev->regs->int_enable);
1318 }
1319 }
1320
1321 /*-------------------------------------------------------------------------*/
1322
1323 /* keeping it simple:
1324 * - one bus driver, initted first;
1325 * - one function driver, initted second
1326 */
1327
1328 /* when a driver is successfully registered, it will receive
1329 * control requests including set_configuration(), which enables
1330 * non-control requests. then usb traffic follows until a
1331 * disconnect is reported. then a host may connect again, or
1332 * the driver might get unbound.
1333 */
1334 static int goku_udc_start(struct usb_gadget *g,
1335 struct usb_gadget_driver *driver)
1336 {
1337 struct goku_udc *dev = to_goku_udc(g);
1338
1339 /* hook up the driver */
1340 driver->driver.bus = NULL;
1341 dev->driver = driver;
1342
1343 /*
1344 * then enable host detection and ep0; and we're ready
1345 * for set_configuration as well as eventual disconnect.
1346 */
1347 udc_enable(dev);
1348
1349 return 0;
1350 }
1351
1352 static void stop_activity(struct goku_udc *dev)
1353 {
1354 unsigned i;
1355
1356 DBG (dev, "%s\n", __func__);
1357
1358 /* disconnect gadget driver after quiesceing hw and the driver */
1359 udc_reset (dev);
1360 for (i = 0; i < 4; i++)
1361 nuke(&dev->ep [i], -ESHUTDOWN);
1362
1363 if (dev->driver)
1364 udc_enable(dev);
1365 }
1366
1367 static int goku_udc_stop(struct usb_gadget *g,
1368 struct usb_gadget_driver *driver)
1369 {
1370 struct goku_udc *dev = to_goku_udc(g);
1371 unsigned long flags;
1372
1373 spin_lock_irqsave(&dev->lock, flags);
1374 dev->driver = NULL;
1375 stop_activity(dev);
1376 spin_unlock_irqrestore(&dev->lock, flags);
1377
1378 return 0;
1379 }
1380
1381 /*-------------------------------------------------------------------------*/
1382
1383 static void ep0_setup(struct goku_udc *dev)
1384 {
1385 struct goku_udc_regs __iomem *regs = dev->regs;
1386 struct usb_ctrlrequest ctrl;
1387 int tmp;
1388
1389 /* read SETUP packet and enter DATA stage */
1390 ctrl.bRequestType = readl(&regs->bRequestType);
1391 ctrl.bRequest = readl(&regs->bRequest);
1392 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1393 | readl(&regs->wValueL));
1394 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1395 | readl(&regs->wIndexL));
1396 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1397 | readl(&regs->wLengthL));
1398 writel(0, &regs->SetupRecv);
1399
1400 nuke(&dev->ep[0], 0);
1401 dev->ep[0].stopped = 0;
1402 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1403 dev->ep[0].is_in = 1;
1404 dev->ep0state = EP0_IN;
1405 /* detect early status stages */
1406 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1407 } else {
1408 dev->ep[0].is_in = 0;
1409 dev->ep0state = EP0_OUT;
1410
1411 /* NOTE: CLEAR_FEATURE is done in software so that we can
1412 * synchronize transfer restarts after bulk IN stalls. data
1413 * won't even enter the fifo until the halt is cleared.
1414 */
1415 switch (ctrl.bRequest) {
1416 case USB_REQ_CLEAR_FEATURE:
1417 switch (ctrl.bRequestType) {
1418 case USB_RECIP_ENDPOINT:
1419 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1420 /* active endpoint */
1421 if (tmp > 3 ||
1422 (!dev->ep[tmp].ep.desc && tmp != 0))
1423 goto stall;
1424 if (ctrl.wIndex & cpu_to_le16(
1425 USB_DIR_IN)) {
1426 if (!dev->ep[tmp].is_in)
1427 goto stall;
1428 } else {
1429 if (dev->ep[tmp].is_in)
1430 goto stall;
1431 }
1432 if (ctrl.wValue != cpu_to_le16(
1433 USB_ENDPOINT_HALT))
1434 goto stall;
1435 if (tmp)
1436 goku_clear_halt(&dev->ep[tmp]);
1437 succeed:
1438 /* start ep0out status stage */
1439 writel(~(1<<0), &regs->EOP);
1440 dev->ep[0].stopped = 1;
1441 dev->ep0state = EP0_STATUS;
1442 return;
1443 case USB_RECIP_DEVICE:
1444 /* device remote wakeup: always clear */
1445 if (ctrl.wValue != cpu_to_le16(1))
1446 goto stall;
1447 VDBG(dev, "clear dev remote wakeup\n");
1448 goto succeed;
1449 case USB_RECIP_INTERFACE:
1450 goto stall;
1451 default: /* pass to gadget driver */
1452 break;
1453 }
1454 break;
1455 default:
1456 break;
1457 }
1458 }
1459
1460 #ifdef USB_TRACE
1461 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1462 ctrl.bRequestType, ctrl.bRequest,
1463 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1464 le16_to_cpu(ctrl.wLength));
1465 #endif
1466
1467 /* hw wants to know when we're configured (or not) */
1468 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1469 && ctrl.bRequestType == USB_RECIP_DEVICE);
1470 if (unlikely(dev->req_config))
1471 dev->configured = (ctrl.wValue != cpu_to_le16(0));
1472
1473 /* delegate everything to the gadget driver.
1474 * it may respond after this irq handler returns.
1475 */
1476 spin_unlock (&dev->lock);
1477 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1478 spin_lock (&dev->lock);
1479 if (unlikely(tmp < 0)) {
1480 stall:
1481 #ifdef USB_TRACE
1482 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1483 ctrl.bRequestType, ctrl.bRequest, tmp);
1484 #endif
1485 command(regs, COMMAND_STALL, 0);
1486 dev->ep[0].stopped = 1;
1487 dev->ep0state = EP0_STALL;
1488 }
1489
1490 /* expect at least one data or status stage irq */
1491 }
1492
1493 #define ACK(irqbit) { \
1494 stat &= ~irqbit; \
1495 writel(~irqbit, &regs->int_status); \
1496 handled = 1; \
1497 }
1498
1499 static irqreturn_t goku_irq(int irq, void *_dev)
1500 {
1501 struct goku_udc *dev = _dev;
1502 struct goku_udc_regs __iomem *regs = dev->regs;
1503 struct goku_ep *ep;
1504 u32 stat, handled = 0;
1505 unsigned i, rescans = 5;
1506
1507 spin_lock(&dev->lock);
1508
1509 rescan:
1510 stat = readl(&regs->int_status) & dev->int_enable;
1511 if (!stat)
1512 goto done;
1513 dev->irqs++;
1514
1515 /* device-wide irqs */
1516 if (unlikely(stat & INT_DEVWIDE)) {
1517 if (stat & INT_SYSERROR) {
1518 ERROR(dev, "system error\n");
1519 stop_activity(dev);
1520 stat = 0;
1521 handled = 1;
1522 // FIXME have a neater way to prevent re-enumeration
1523 dev->driver = NULL;
1524 goto done;
1525 }
1526 if (stat & INT_PWRDETECT) {
1527 writel(~stat, &regs->int_status);
1528 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1529 VDBG(dev, "connect\n");
1530 ep0_start(dev);
1531 } else {
1532 DBG(dev, "disconnect\n");
1533 if (dev->gadget.speed == USB_SPEED_FULL)
1534 stop_activity(dev);
1535 dev->ep0state = EP0_DISCONNECT;
1536 dev->int_enable = INT_DEVWIDE;
1537 writel(dev->int_enable, &dev->regs->int_enable);
1538 }
1539 stat = 0;
1540 handled = 1;
1541 goto done;
1542 }
1543 if (stat & INT_SUSPEND) {
1544 ACK(INT_SUSPEND);
1545 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1546 switch (dev->ep0state) {
1547 case EP0_DISCONNECT:
1548 case EP0_SUSPEND:
1549 goto pm_next;
1550 default:
1551 break;
1552 }
1553 DBG(dev, "USB suspend\n");
1554 dev->ep0state = EP0_SUSPEND;
1555 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1556 && dev->driver
1557 && dev->driver->suspend) {
1558 spin_unlock(&dev->lock);
1559 dev->driver->suspend(&dev->gadget);
1560 spin_lock(&dev->lock);
1561 }
1562 } else {
1563 if (dev->ep0state != EP0_SUSPEND) {
1564 DBG(dev, "bogus USB resume %d\n",
1565 dev->ep0state);
1566 goto pm_next;
1567 }
1568 DBG(dev, "USB resume\n");
1569 dev->ep0state = EP0_IDLE;
1570 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1571 && dev->driver
1572 && dev->driver->resume) {
1573 spin_unlock(&dev->lock);
1574 dev->driver->resume(&dev->gadget);
1575 spin_lock(&dev->lock);
1576 }
1577 }
1578 }
1579 pm_next:
1580 if (stat & INT_USBRESET) { /* hub reset done */
1581 ACK(INT_USBRESET);
1582 INFO(dev, "USB reset done, gadget %s\n",
1583 dev->driver->driver.name);
1584 }
1585 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1586 }
1587
1588 /* progress ep0 setup, data, or status stages.
1589 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1590 */
1591 if (stat & INT_SETUP) {
1592 ACK(INT_SETUP);
1593 dev->ep[0].irqs++;
1594 ep0_setup(dev);
1595 }
1596 if (stat & INT_STATUSNAK) {
1597 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1598 if (dev->ep0state == EP0_IN) {
1599 ep = &dev->ep[0];
1600 ep->irqs++;
1601 nuke(ep, 0);
1602 writel(~(1<<0), &regs->EOP);
1603 dev->ep0state = EP0_STATUS;
1604 }
1605 }
1606 if (stat & INT_ENDPOINT0) {
1607 ACK(INT_ENDPOINT0);
1608 ep = &dev->ep[0];
1609 ep->irqs++;
1610 pio_advance(ep);
1611 }
1612
1613 /* dma completion */
1614 if (stat & INT_MSTRDEND) { /* IN */
1615 ACK(INT_MSTRDEND);
1616 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1617 ep->irqs++;
1618 dma_advance(dev, ep);
1619 }
1620 if (stat & INT_MSTWREND) { /* OUT */
1621 ACK(INT_MSTWREND);
1622 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1623 ep->irqs++;
1624 dma_advance(dev, ep);
1625 }
1626 if (stat & INT_MSTWRTMOUT) { /* OUT */
1627 ACK(INT_MSTWRTMOUT);
1628 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1629 ep->irqs++;
1630 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1631 // reset dma? then dma_advance()
1632 }
1633
1634 /* pio */
1635 for (i = 1; i < 4; i++) {
1636 u32 tmp = INT_EPxDATASET(i);
1637
1638 if (!(stat & tmp))
1639 continue;
1640 ep = &dev->ep[i];
1641 pio_advance(ep);
1642 if (list_empty (&ep->queue))
1643 pio_irq_disable(dev, regs, i);
1644 stat &= ~tmp;
1645 handled = 1;
1646 ep->irqs++;
1647 }
1648
1649 if (rescans--)
1650 goto rescan;
1651
1652 done:
1653 (void)readl(&regs->int_enable);
1654 spin_unlock(&dev->lock);
1655 if (stat)
1656 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1657 readl(&regs->int_status), dev->int_enable);
1658 return IRQ_RETVAL(handled);
1659 }
1660
1661 #undef ACK
1662
1663 /*-------------------------------------------------------------------------*/
1664
1665 static void gadget_release(struct device *_dev)
1666 {
1667 struct goku_udc *dev = dev_get_drvdata(_dev);
1668
1669 kfree(dev);
1670 }
1671
1672 /* tear down the binding between this driver and the pci device */
1673
1674 static void goku_remove(struct pci_dev *pdev)
1675 {
1676 struct goku_udc *dev = pci_get_drvdata(pdev);
1677
1678 DBG(dev, "%s\n", __func__);
1679
1680 usb_del_gadget_udc(&dev->gadget);
1681
1682 BUG_ON(dev->driver);
1683
1684 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1685 remove_proc_entry(proc_node_name, NULL);
1686 #endif
1687 if (dev->regs)
1688 udc_reset(dev);
1689 if (dev->got_irq)
1690 free_irq(pdev->irq, dev);
1691 if (dev->regs)
1692 iounmap(dev->regs);
1693 if (dev->got_region)
1694 release_mem_region(pci_resource_start (pdev, 0),
1695 pci_resource_len (pdev, 0));
1696 if (dev->enabled)
1697 pci_disable_device(pdev);
1698
1699 dev->regs = NULL;
1700
1701 INFO(dev, "unbind\n");
1702 }
1703
1704 /* wrap this driver around the specified pci device, but
1705 * don't respond over USB until a gadget driver binds to us.
1706 */
1707
1708 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1709 {
1710 struct goku_udc *dev = NULL;
1711 unsigned long resource, len;
1712 void __iomem *base = NULL;
1713 int retval;
1714
1715 if (!pdev->irq) {
1716 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1717 retval = -ENODEV;
1718 goto err;
1719 }
1720
1721 /* alloc, and start init */
1722 dev = kzalloc (sizeof *dev, GFP_KERNEL);
1723 if (dev == NULL){
1724 pr_debug("enomem %s\n", pci_name(pdev));
1725 retval = -ENOMEM;
1726 goto err;
1727 }
1728
1729 spin_lock_init(&dev->lock);
1730 dev->pdev = pdev;
1731 dev->gadget.ops = &goku_ops;
1732 dev->gadget.max_speed = USB_SPEED_FULL;
1733
1734 /* the "gadget" abstracts/virtualizes the controller */
1735 dev->gadget.name = driver_name;
1736
1737 /* now all the pci goodies ... */
1738 retval = pci_enable_device(pdev);
1739 if (retval < 0) {
1740 DBG(dev, "can't enable, %d\n", retval);
1741 goto err;
1742 }
1743 dev->enabled = 1;
1744
1745 resource = pci_resource_start(pdev, 0);
1746 len = pci_resource_len(pdev, 0);
1747 if (!request_mem_region(resource, len, driver_name)) {
1748 DBG(dev, "controller already in use\n");
1749 retval = -EBUSY;
1750 goto err;
1751 }
1752 dev->got_region = 1;
1753
1754 base = ioremap_nocache(resource, len);
1755 if (base == NULL) {
1756 DBG(dev, "can't map memory\n");
1757 retval = -EFAULT;
1758 goto err;
1759 }
1760 dev->regs = (struct goku_udc_regs __iomem *) base;
1761
1762 pci_set_drvdata(pdev, dev);
1763 INFO(dev, "%s\n", driver_desc);
1764 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1765 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1766
1767 /* init to known state, then setup irqs */
1768 udc_reset(dev);
1769 udc_reinit (dev);
1770 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED,
1771 driver_name, dev) != 0) {
1772 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1773 retval = -EBUSY;
1774 goto err;
1775 }
1776 dev->got_irq = 1;
1777 if (use_dma)
1778 pci_set_master(pdev);
1779
1780
1781 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1782 proc_create_data(proc_node_name, 0, NULL, &udc_proc_fops, dev);
1783 #endif
1784
1785 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
1786 gadget_release);
1787 if (retval)
1788 goto err;
1789
1790 return 0;
1791
1792 err:
1793 if (dev)
1794 goku_remove (pdev);
1795 return retval;
1796 }
1797
1798
1799 /*-------------------------------------------------------------------------*/
1800
1801 static const struct pci_device_id pci_ids[] = { {
1802 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1803 .class_mask = ~0,
1804 .vendor = 0x102f, /* Toshiba */
1805 .device = 0x0107, /* this UDC */
1806 .subvendor = PCI_ANY_ID,
1807 .subdevice = PCI_ANY_ID,
1808
1809 }, { /* end: all zeroes */ }
1810 };
1811 MODULE_DEVICE_TABLE (pci, pci_ids);
1812
1813 static struct pci_driver goku_pci_driver = {
1814 .name = (char *) driver_name,
1815 .id_table = pci_ids,
1816
1817 .probe = goku_probe,
1818 .remove = goku_remove,
1819
1820 /* FIXME add power management support */
1821 };
1822
1823 module_pci_driver(goku_pci_driver);
Linux kernel - Deliverables
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