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doc: Update rcu_assign_pointer() definition in whatisRCU.txt
[linux/fpc-iii.git] / drivers / usb / gadget / udc / goku_udc.c
blob8433c22900dcb56be27bd3cc56a16420a479e619
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 usb_gadget_giveback_request(&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 const 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 struct usb_ep *goku_match_ep(struct usb_gadget *g,
994 struct usb_endpoint_descriptor *desc,
995 struct usb_ss_ep_comp_descriptor *ep_comp)
996 {
997 struct goku_udc *dev = to_goku_udc(g);
998 struct usb_ep *ep;
999
1000 switch (usb_endpoint_type(desc)) {
1001 case USB_ENDPOINT_XFER_INT:
1002 /* single buffering is enough */
1003 ep = &dev->ep[3].ep;
1004 if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp))
1005 return ep;
1006 break;
1007 case USB_ENDPOINT_XFER_BULK:
1008 if (usb_endpoint_dir_in(desc)) {
1009 /* DMA may be available */
1010 ep = &dev->ep[2].ep;
1011 if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp))
1012 return ep;
1013 }
1014 break;
1015 default:
1016 /* nothing */ ;
1017 }
1018
1019 return NULL;
1020 }
1021
1022 static int goku_udc_start(struct usb_gadget *g,
1023 struct usb_gadget_driver *driver);
1024 static int goku_udc_stop(struct usb_gadget *g);
1025
1026 static const struct usb_gadget_ops goku_ops = {
1027 .get_frame = goku_get_frame,
1028 .udc_start = goku_udc_start,
1029 .udc_stop = goku_udc_stop,
1030 .match_ep = goku_match_ep,
1031 // no remote wakeup
1032 // not selfpowered
1033 };
1034
1035 /*-------------------------------------------------------------------------*/
1036
1037 static inline const char *dmastr(void)
1038 {
1039 if (use_dma == 0)
1040 return "(dma disabled)";
1041 else if (use_dma == 2)
1042 return "(dma IN and OUT)";
1043 else
1044 return "(dma IN)";
1045 }
1046
1047 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1048
1049 static const char proc_node_name [] = "driver/udc";
1050
1051 #define FOURBITS "%s%s%s%s"
1052 #define EIGHTBITS FOURBITS FOURBITS
1053
1054 static void dump_intmask(struct seq_file *m, const char *label, u32 mask)
1055 {
1056 /* int_status is the same format ... */
1057 seq_printf(m, "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1058 label, mask,
1059 (mask & INT_PWRDETECT) ? " power" : "",
1060 (mask & INT_SYSERROR) ? " sys" : "",
1061 (mask & INT_MSTRDEND) ? " in-dma" : "",
1062 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1063
1064 (mask & INT_MSTWREND) ? " out-dma" : "",
1065 (mask & INT_MSTWRSET) ? " wrset" : "",
1066 (mask & INT_ERR) ? " err" : "",
1067 (mask & INT_SOF) ? " sof" : "",
1068
1069 (mask & INT_EP3NAK) ? " ep3nak" : "",
1070 (mask & INT_EP2NAK) ? " ep2nak" : "",
1071 (mask & INT_EP1NAK) ? " ep1nak" : "",
1072 (mask & INT_EP3DATASET) ? " ep3" : "",
1073
1074 (mask & INT_EP2DATASET) ? " ep2" : "",
1075 (mask & INT_EP1DATASET) ? " ep1" : "",
1076 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1077 (mask & INT_STATUS) ? " ep0status" : "",
1078
1079 (mask & INT_SETUP) ? " setup" : "",
1080 (mask & INT_ENDPOINT0) ? " ep0" : "",
1081 (mask & INT_USBRESET) ? " reset" : "",
1082 (mask & INT_SUSPEND) ? " suspend" : "");
1083 }
1084
1085 static const char *udc_ep_state(enum ep0state state)
1086 {
1087 switch (state) {
1088 case EP0_DISCONNECT:
1089 return "ep0_disconnect";
1090 case EP0_IDLE:
1091 return "ep0_idle";
1092 case EP0_IN:
1093 return "ep0_in";
1094 case EP0_OUT:
1095 return "ep0_out";
1096 case EP0_STATUS:
1097 return "ep0_status";
1098 case EP0_STALL:
1099 return "ep0_stall";
1100 case EP0_SUSPEND:
1101 return "ep0_suspend";
1102 }
1103
1104 return "ep0_?";
1105 }
1106
1107 static const char *udc_ep_status(u32 status)
1108 {
1109 switch (status & EPxSTATUS_EP_MASK) {
1110 case EPxSTATUS_EP_READY:
1111 return "ready";
1112 case EPxSTATUS_EP_DATAIN:
1113 return "packet";
1114 case EPxSTATUS_EP_FULL:
1115 return "full";
1116 case EPxSTATUS_EP_TX_ERR: /* host will retry */
1117 return "tx_err";
1118 case EPxSTATUS_EP_RX_ERR:
1119 return "rx_err";
1120 case EPxSTATUS_EP_BUSY: /* ep0 only */
1121 return "busy";
1122 case EPxSTATUS_EP_STALL:
1123 return "stall";
1124 case EPxSTATUS_EP_INVALID: /* these "can't happen" */
1125 return "invalid";
1126 }
1127
1128 return "?";
1129 }
1130
1131 static int udc_proc_read(struct seq_file *m, void *v)
1132 {
1133 struct goku_udc *dev = m->private;
1134 struct goku_udc_regs __iomem *regs = dev->regs;
1135 unsigned long flags;
1136 int i, is_usb_connected;
1137 u32 tmp;
1138
1139 local_irq_save(flags);
1140
1141 /* basic device status */
1142 tmp = readl(&regs->power_detect);
1143 is_usb_connected = tmp & PW_DETECT;
1144 seq_printf(m,
1145 "%s - %s\n"
1146 "%s version: %s %s\n"
1147 "Gadget driver: %s\n"
1148 "Host %s, %s\n"
1149 "\n",
1150 pci_name(dev->pdev), driver_desc,
1151 driver_name, DRIVER_VERSION, dmastr(),
1152 dev->driver ? dev->driver->driver.name : "(none)",
1153 is_usb_connected
1154 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1155 : "disconnected",
1156 udc_ep_state(dev->ep0state));
1157
1158 dump_intmask(m, "int_status", readl(&regs->int_status));
1159 dump_intmask(m, "int_enable", readl(&regs->int_enable));
1160
1161 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1162 goto done;
1163
1164 /* registers for (active) device and ep0 */
1165 seq_printf(m, "\nirqs %lu\ndataset %02x single.bcs %02x.%02x state %x addr %u\n",
1166 dev->irqs, readl(&regs->DataSet),
1167 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1168 readl(&regs->UsbState),
1169 readl(&regs->address));
1170 if (seq_has_overflowed(m))
1171 goto done;
1172
1173 tmp = readl(&regs->dma_master);
1174 seq_printf(m, "dma %03X =" EIGHTBITS "%s %s\n",
1175 tmp,
1176 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1177 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1178 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1179 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1180
1181 (tmp & MST_RD_EOPB) ? " eopb" : "",
1182 (tmp & MST_RD_RESET) ? " in_reset" : "",
1183 (tmp & MST_WR_RESET) ? " out_reset" : "",
1184 (tmp & MST_RD_ENA) ? " IN" : "",
1185
1186 (tmp & MST_WR_ENA) ? " OUT" : "",
1187 (tmp & MST_CONNECTION) ? "ep1in/ep2out" : "ep1out/ep2in");
1188 if (seq_has_overflowed(m))
1189 goto done;
1190
1191 /* dump endpoint queues */
1192 for (i = 0; i < 4; i++) {
1193 struct goku_ep *ep = &dev->ep [i];
1194 struct goku_request *req;
1195
1196 if (i && !ep->ep.desc)
1197 continue;
1198
1199 tmp = readl(ep->reg_status);
1200 seq_printf(m, "%s %s max %u %s, irqs %lu, status %02x (%s) " FOURBITS "\n",
1201 ep->ep.name,
1202 ep->is_in ? "in" : "out",
1203 ep->ep.maxpacket,
1204 ep->dma ? "dma" : "pio",
1205 ep->irqs,
1206 tmp, udc_ep_status(tmp),
1207 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1208 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1209 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1210 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : "");
1211 if (seq_has_overflowed(m))
1212 goto done;
1213
1214 if (list_empty(&ep->queue)) {
1215 seq_puts(m, "\t(nothing queued)\n");
1216 if (seq_has_overflowed(m))
1217 goto done;
1218 continue;
1219 }
1220 list_for_each_entry(req, &ep->queue, queue) {
1221 if (ep->dma && req->queue.prev == &ep->queue) {
1222 if (i == UDC_MSTRD_ENDPOINT)
1223 tmp = readl(&regs->in_dma_current);
1224 else
1225 tmp = readl(&regs->out_dma_current);
1226 tmp -= req->req.dma;
1227 tmp++;
1228 } else
1229 tmp = req->req.actual;
1230
1231 seq_printf(m, "\treq %p len %u/%u buf %p\n",
1232 &req->req, tmp, req->req.length,
1233 req->req.buf);
1234 if (seq_has_overflowed(m))
1235 goto done;
1236 }
1237 }
1238
1239 done:
1240 local_irq_restore(flags);
1241 return 0;
1242 }
1243
1244 /*
1245 * seq_file wrappers for procfile show routines.
1246 */
1247 static int udc_proc_open(struct inode *inode, struct file *file)
1248 {
1249 return single_open(file, udc_proc_read, PDE_DATA(file_inode(file)));
1250 }
1251
1252 static const struct file_operations udc_proc_fops = {
1253 .open = udc_proc_open,
1254 .read = seq_read,
1255 .llseek = seq_lseek,
1256 .release = single_release,
1257 };
1258
1259 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1260
1261 /*-------------------------------------------------------------------------*/
1262
1263 static void udc_reinit (struct goku_udc *dev)
1264 {
1265 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1266
1267 unsigned i;
1268
1269 INIT_LIST_HEAD (&dev->gadget.ep_list);
1270 dev->gadget.ep0 = &dev->ep [0].ep;
1271 dev->gadget.speed = USB_SPEED_UNKNOWN;
1272 dev->ep0state = EP0_DISCONNECT;
1273 dev->irqs = 0;
1274
1275 for (i = 0; i < 4; i++) {
1276 struct goku_ep *ep = &dev->ep[i];
1277
1278 ep->num = i;
1279 ep->ep.name = names[i];
1280 ep->reg_fifo = &dev->regs->ep_fifo [i];
1281 ep->reg_status = &dev->regs->ep_status [i];
1282 ep->reg_mode = &dev->regs->ep_mode[i];
1283
1284 ep->ep.ops = &goku_ep_ops;
1285 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1286 ep->dev = dev;
1287 INIT_LIST_HEAD (&ep->queue);
1288
1289 ep_reset(NULL, ep);
1290
1291 if (i == 0)
1292 ep->ep.caps.type_control = true;
1293 else
1294 ep->ep.caps.type_bulk = true;
1295
1296 ep->ep.caps.dir_in = true;
1297 ep->ep.caps.dir_out = true;
1298 }
1299
1300 dev->ep[0].reg_mode = NULL;
1301 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, MAX_EP0_SIZE);
1302 list_del_init (&dev->ep[0].ep.ep_list);
1303 }
1304
1305 static void udc_reset(struct goku_udc *dev)
1306 {
1307 struct goku_udc_regs __iomem *regs = dev->regs;
1308
1309 writel(0, &regs->power_detect);
1310 writel(0, &regs->int_enable);
1311 readl(&regs->int_enable);
1312 dev->int_enable = 0;
1313
1314 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1315 * don't let INT_PWRDETECT sequence begin
1316 */
1317 udelay(250);
1318 writel(PW_RESETB, &regs->power_detect);
1319 readl(&regs->int_enable);
1320 }
1321
1322 static void ep0_start(struct goku_udc *dev)
1323 {
1324 struct goku_udc_regs __iomem *regs = dev->regs;
1325 unsigned i;
1326
1327 VDBG(dev, "%s\n", __func__);
1328
1329 udc_reset(dev);
1330 udc_reinit (dev);
1331 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1332
1333 /* hw handles set_address, set_feature, get_status; maybe more */
1334 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1335 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1336 | G_REQMODE_GET_DESC
1337 | G_REQMODE_CLEAR_FEAT
1338 , &regs->reqmode);
1339
1340 for (i = 0; i < 4; i++)
1341 dev->ep[i].irqs = 0;
1342
1343 /* can't modify descriptors after writing UsbReady */
1344 for (i = 0; i < DESC_LEN; i++)
1345 writel(0, &regs->descriptors[i]);
1346 writel(0, &regs->UsbReady);
1347
1348 /* expect ep0 requests when the host drops reset */
1349 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1350 dev->int_enable = INT_DEVWIDE | INT_EP0;
1351 writel(dev->int_enable, &dev->regs->int_enable);
1352 readl(&regs->int_enable);
1353 dev->gadget.speed = USB_SPEED_FULL;
1354 dev->ep0state = EP0_IDLE;
1355 }
1356
1357 static void udc_enable(struct goku_udc *dev)
1358 {
1359 /* start enumeration now, or after power detect irq */
1360 if (readl(&dev->regs->power_detect) & PW_DETECT)
1361 ep0_start(dev);
1362 else {
1363 DBG(dev, "%s\n", __func__);
1364 dev->int_enable = INT_PWRDETECT;
1365 writel(dev->int_enable, &dev->regs->int_enable);
1366 }
1367 }
1368
1369 /*-------------------------------------------------------------------------*/
1370
1371 /* keeping it simple:
1372 * - one bus driver, initted first;
1373 * - one function driver, initted second
1374 */
1375
1376 /* when a driver is successfully registered, it will receive
1377 * control requests including set_configuration(), which enables
1378 * non-control requests. then usb traffic follows until a
1379 * disconnect is reported. then a host may connect again, or
1380 * the driver might get unbound.
1381 */
1382 static int goku_udc_start(struct usb_gadget *g,
1383 struct usb_gadget_driver *driver)
1384 {
1385 struct goku_udc *dev = to_goku_udc(g);
1386
1387 /* hook up the driver */
1388 driver->driver.bus = NULL;
1389 dev->driver = driver;
1390
1391 /*
1392 * then enable host detection and ep0; and we're ready
1393 * for set_configuration as well as eventual disconnect.
1394 */
1395 udc_enable(dev);
1396
1397 return 0;
1398 }
1399
1400 static void stop_activity(struct goku_udc *dev)
1401 {
1402 unsigned i;
1403
1404 DBG (dev, "%s\n", __func__);
1405
1406 /* disconnect gadget driver after quiesceing hw and the driver */
1407 udc_reset (dev);
1408 for (i = 0; i < 4; i++)
1409 nuke(&dev->ep [i], -ESHUTDOWN);
1410
1411 if (dev->driver)
1412 udc_enable(dev);
1413 }
1414
1415 static int goku_udc_stop(struct usb_gadget *g)
1416 {
1417 struct goku_udc *dev = to_goku_udc(g);
1418 unsigned long flags;
1419
1420 spin_lock_irqsave(&dev->lock, flags);
1421 dev->driver = NULL;
1422 stop_activity(dev);
1423 spin_unlock_irqrestore(&dev->lock, flags);
1424
1425 return 0;
1426 }
1427
1428 /*-------------------------------------------------------------------------*/
1429
1430 static void ep0_setup(struct goku_udc *dev)
1431 {
1432 struct goku_udc_regs __iomem *regs = dev->regs;
1433 struct usb_ctrlrequest ctrl;
1434 int tmp;
1435
1436 /* read SETUP packet and enter DATA stage */
1437 ctrl.bRequestType = readl(&regs->bRequestType);
1438 ctrl.bRequest = readl(&regs->bRequest);
1439 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1440 | readl(&regs->wValueL));
1441 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1442 | readl(&regs->wIndexL));
1443 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1444 | readl(&regs->wLengthL));
1445 writel(0, &regs->SetupRecv);
1446
1447 nuke(&dev->ep[0], 0);
1448 dev->ep[0].stopped = 0;
1449 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1450 dev->ep[0].is_in = 1;
1451 dev->ep0state = EP0_IN;
1452 /* detect early status stages */
1453 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1454 } else {
1455 dev->ep[0].is_in = 0;
1456 dev->ep0state = EP0_OUT;
1457
1458 /* NOTE: CLEAR_FEATURE is done in software so that we can
1459 * synchronize transfer restarts after bulk IN stalls. data
1460 * won't even enter the fifo until the halt is cleared.
1461 */
1462 switch (ctrl.bRequest) {
1463 case USB_REQ_CLEAR_FEATURE:
1464 switch (ctrl.bRequestType) {
1465 case USB_RECIP_ENDPOINT:
1466 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1467 /* active endpoint */
1468 if (tmp > 3 ||
1469 (!dev->ep[tmp].ep.desc && tmp != 0))
1470 goto stall;
1471 if (ctrl.wIndex & cpu_to_le16(
1472 USB_DIR_IN)) {
1473 if (!dev->ep[tmp].is_in)
1474 goto stall;
1475 } else {
1476 if (dev->ep[tmp].is_in)
1477 goto stall;
1478 }
1479 if (ctrl.wValue != cpu_to_le16(
1480 USB_ENDPOINT_HALT))
1481 goto stall;
1482 if (tmp)
1483 goku_clear_halt(&dev->ep[tmp]);
1484 succeed:
1485 /* start ep0out status stage */
1486 writel(~(1<<0), &regs->EOP);
1487 dev->ep[0].stopped = 1;
1488 dev->ep0state = EP0_STATUS;
1489 return;
1490 case USB_RECIP_DEVICE:
1491 /* device remote wakeup: always clear */
1492 if (ctrl.wValue != cpu_to_le16(1))
1493 goto stall;
1494 VDBG(dev, "clear dev remote wakeup\n");
1495 goto succeed;
1496 case USB_RECIP_INTERFACE:
1497 goto stall;
1498 default: /* pass to gadget driver */
1499 break;
1500 }
1501 break;
1502 default:
1503 break;
1504 }
1505 }
1506
1507 #ifdef USB_TRACE
1508 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1509 ctrl.bRequestType, ctrl.bRequest,
1510 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1511 le16_to_cpu(ctrl.wLength));
1512 #endif
1513
1514 /* hw wants to know when we're configured (or not) */
1515 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1516 && ctrl.bRequestType == USB_RECIP_DEVICE);
1517 if (unlikely(dev->req_config))
1518 dev->configured = (ctrl.wValue != cpu_to_le16(0));
1519
1520 /* delegate everything to the gadget driver.
1521 * it may respond after this irq handler returns.
1522 */
1523 spin_unlock (&dev->lock);
1524 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1525 spin_lock (&dev->lock);
1526 if (unlikely(tmp < 0)) {
1527 stall:
1528 #ifdef USB_TRACE
1529 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1530 ctrl.bRequestType, ctrl.bRequest, tmp);
1531 #endif
1532 command(regs, COMMAND_STALL, 0);
1533 dev->ep[0].stopped = 1;
1534 dev->ep0state = EP0_STALL;
1535 }
1536
1537 /* expect at least one data or status stage irq */
1538 }
1539
1540 #define ACK(irqbit) { \
1541 stat &= ~irqbit; \
1542 writel(~irqbit, &regs->int_status); \
1543 handled = 1; \
1544 }
1545
1546 static irqreturn_t goku_irq(int irq, void *_dev)
1547 {
1548 struct goku_udc *dev = _dev;
1549 struct goku_udc_regs __iomem *regs = dev->regs;
1550 struct goku_ep *ep;
1551 u32 stat, handled = 0;
1552 unsigned i, rescans = 5;
1553
1554 spin_lock(&dev->lock);
1555
1556 rescan:
1557 stat = readl(&regs->int_status) & dev->int_enable;
1558 if (!stat)
1559 goto done;
1560 dev->irqs++;
1561
1562 /* device-wide irqs */
1563 if (unlikely(stat & INT_DEVWIDE)) {
1564 if (stat & INT_SYSERROR) {
1565 ERROR(dev, "system error\n");
1566 stop_activity(dev);
1567 stat = 0;
1568 handled = 1;
1569 // FIXME have a neater way to prevent re-enumeration
1570 dev->driver = NULL;
1571 goto done;
1572 }
1573 if (stat & INT_PWRDETECT) {
1574 writel(~stat, &regs->int_status);
1575 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1576 VDBG(dev, "connect\n");
1577 ep0_start(dev);
1578 } else {
1579 DBG(dev, "disconnect\n");
1580 if (dev->gadget.speed == USB_SPEED_FULL)
1581 stop_activity(dev);
1582 dev->ep0state = EP0_DISCONNECT;
1583 dev->int_enable = INT_DEVWIDE;
1584 writel(dev->int_enable, &dev->regs->int_enable);
1585 }
1586 stat = 0;
1587 handled = 1;
1588 goto done;
1589 }
1590 if (stat & INT_SUSPEND) {
1591 ACK(INT_SUSPEND);
1592 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1593 switch (dev->ep0state) {
1594 case EP0_DISCONNECT:
1595 case EP0_SUSPEND:
1596 goto pm_next;
1597 default:
1598 break;
1599 }
1600 DBG(dev, "USB suspend\n");
1601 dev->ep0state = EP0_SUSPEND;
1602 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1603 && dev->driver
1604 && dev->driver->suspend) {
1605 spin_unlock(&dev->lock);
1606 dev->driver->suspend(&dev->gadget);
1607 spin_lock(&dev->lock);
1608 }
1609 } else {
1610 if (dev->ep0state != EP0_SUSPEND) {
1611 DBG(dev, "bogus USB resume %d\n",
1612 dev->ep0state);
1613 goto pm_next;
1614 }
1615 DBG(dev, "USB resume\n");
1616 dev->ep0state = EP0_IDLE;
1617 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1618 && dev->driver
1619 && dev->driver->resume) {
1620 spin_unlock(&dev->lock);
1621 dev->driver->resume(&dev->gadget);
1622 spin_lock(&dev->lock);
1623 }
1624 }
1625 }
1626 pm_next:
1627 if (stat & INT_USBRESET) { /* hub reset done */
1628 ACK(INT_USBRESET);
1629 INFO(dev, "USB reset done, gadget %s\n",
1630 dev->driver->driver.name);
1631 }
1632 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1633 }
1634
1635 /* progress ep0 setup, data, or status stages.
1636 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1637 */
1638 if (stat & INT_SETUP) {
1639 ACK(INT_SETUP);
1640 dev->ep[0].irqs++;
1641 ep0_setup(dev);
1642 }
1643 if (stat & INT_STATUSNAK) {
1644 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1645 if (dev->ep0state == EP0_IN) {
1646 ep = &dev->ep[0];
1647 ep->irqs++;
1648 nuke(ep, 0);
1649 writel(~(1<<0), &regs->EOP);
1650 dev->ep0state = EP0_STATUS;
1651 }
1652 }
1653 if (stat & INT_ENDPOINT0) {
1654 ACK(INT_ENDPOINT0);
1655 ep = &dev->ep[0];
1656 ep->irqs++;
1657 pio_advance(ep);
1658 }
1659
1660 /* dma completion */
1661 if (stat & INT_MSTRDEND) { /* IN */
1662 ACK(INT_MSTRDEND);
1663 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1664 ep->irqs++;
1665 dma_advance(dev, ep);
1666 }
1667 if (stat & INT_MSTWREND) { /* OUT */
1668 ACK(INT_MSTWREND);
1669 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1670 ep->irqs++;
1671 dma_advance(dev, ep);
1672 }
1673 if (stat & INT_MSTWRTMOUT) { /* OUT */
1674 ACK(INT_MSTWRTMOUT);
1675 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1676 ep->irqs++;
1677 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1678 // reset dma? then dma_advance()
1679 }
1680
1681 /* pio */
1682 for (i = 1; i < 4; i++) {
1683 u32 tmp = INT_EPxDATASET(i);
1684
1685 if (!(stat & tmp))
1686 continue;
1687 ep = &dev->ep[i];
1688 pio_advance(ep);
1689 if (list_empty (&ep->queue))
1690 pio_irq_disable(dev, regs, i);
1691 stat &= ~tmp;
1692 handled = 1;
1693 ep->irqs++;
1694 }
1695
1696 if (rescans--)
1697 goto rescan;
1698
1699 done:
1700 (void)readl(&regs->int_enable);
1701 spin_unlock(&dev->lock);
1702 if (stat)
1703 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1704 readl(&regs->int_status), dev->int_enable);
1705 return IRQ_RETVAL(handled);
1706 }
1707
1708 #undef ACK
1709
1710 /*-------------------------------------------------------------------------*/
1711
1712 static void gadget_release(struct device *_dev)
1713 {
1714 struct goku_udc *dev = dev_get_drvdata(_dev);
1715
1716 kfree(dev);
1717 }
1718
1719 /* tear down the binding between this driver and the pci device */
1720
1721 static void goku_remove(struct pci_dev *pdev)
1722 {
1723 struct goku_udc *dev = pci_get_drvdata(pdev);
1724
1725 DBG(dev, "%s\n", __func__);
1726
1727 usb_del_gadget_udc(&dev->gadget);
1728
1729 BUG_ON(dev->driver);
1730
1731 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1732 remove_proc_entry(proc_node_name, NULL);
1733 #endif
1734 if (dev->regs)
1735 udc_reset(dev);
1736 if (dev->got_irq)
1737 free_irq(pdev->irq, dev);
1738 if (dev->regs)
1739 iounmap(dev->regs);
1740 if (dev->got_region)
1741 release_mem_region(pci_resource_start (pdev, 0),
1742 pci_resource_len (pdev, 0));
1743 if (dev->enabled)
1744 pci_disable_device(pdev);
1745
1746 dev->regs = NULL;
1747
1748 INFO(dev, "unbind\n");
1749 }
1750
1751 /* wrap this driver around the specified pci device, but
1752 * don't respond over USB until a gadget driver binds to us.
1753 */
1754
1755 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1756 {
1757 struct goku_udc *dev = NULL;
1758 unsigned long resource, len;
1759 void __iomem *base = NULL;
1760 int retval;
1761
1762 if (!pdev->irq) {
1763 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1764 retval = -ENODEV;
1765 goto err;
1766 }
1767
1768 /* alloc, and start init */
1769 dev = kzalloc (sizeof *dev, GFP_KERNEL);
1770 if (!dev) {
1771 retval = -ENOMEM;
1772 goto err;
1773 }
1774
1775 spin_lock_init(&dev->lock);
1776 dev->pdev = pdev;
1777 dev->gadget.ops = &goku_ops;
1778 dev->gadget.max_speed = USB_SPEED_FULL;
1779
1780 /* the "gadget" abstracts/virtualizes the controller */
1781 dev->gadget.name = driver_name;
1782
1783 /* now all the pci goodies ... */
1784 retval = pci_enable_device(pdev);
1785 if (retval < 0) {
1786 DBG(dev, "can't enable, %d\n", retval);
1787 goto err;
1788 }
1789 dev->enabled = 1;
1790
1791 resource = pci_resource_start(pdev, 0);
1792 len = pci_resource_len(pdev, 0);
1793 if (!request_mem_region(resource, len, driver_name)) {
1794 DBG(dev, "controller already in use\n");
1795 retval = -EBUSY;
1796 goto err;
1797 }
1798 dev->got_region = 1;
1799
1800 base = ioremap_nocache(resource, len);
1801 if (base == NULL) {
1802 DBG(dev, "can't map memory\n");
1803 retval = -EFAULT;
1804 goto err;
1805 }
1806 dev->regs = (struct goku_udc_regs __iomem *) base;
1807
1808 pci_set_drvdata(pdev, dev);
1809 INFO(dev, "%s\n", driver_desc);
1810 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1811 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1812
1813 /* init to known state, then setup irqs */
1814 udc_reset(dev);
1815 udc_reinit (dev);
1816 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED,
1817 driver_name, dev) != 0) {
1818 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1819 retval = -EBUSY;
1820 goto err;
1821 }
1822 dev->got_irq = 1;
1823 if (use_dma)
1824 pci_set_master(pdev);
1825
1826
1827 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1828 proc_create_data(proc_node_name, 0, NULL, &udc_proc_fops, dev);
1829 #endif
1830
1831 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
1832 gadget_release);
1833 if (retval)
1834 goto err;
1835
1836 return 0;
1837
1838 err:
1839 if (dev)
1840 goku_remove (pdev);
1841 /* gadget_release is not registered yet, kfree explicitly */
1842 kfree(dev);
1843 return retval;
1844 }
1845
1846
1847 /*-------------------------------------------------------------------------*/
1848
1849 static const struct pci_device_id pci_ids[] = { {
1850 .class = PCI_CLASS_SERIAL_USB_DEVICE,
1851 .class_mask = ~0,
1852 .vendor = 0x102f, /* Toshiba */
1853 .device = 0x0107, /* this UDC */
1854 .subvendor = PCI_ANY_ID,
1855 .subdevice = PCI_ANY_ID,
1856
1857 }, { /* end: all zeroes */ }
1858 };
1859 MODULE_DEVICE_TABLE (pci, pci_ids);
1860
1861 static struct pci_driver goku_pci_driver = {
1862 .name = (char *) driver_name,
1863 .id_table = pci_ids,
1864
1865 .probe = goku_probe,
1866 .remove = goku_remove,
1867
1868 /* FIXME add power management support */
1869 };
1870
1871 module_pci_driver(goku_pci_driver);
Linux with added FPC-III support