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USB: fsl_usb2_udc: Get max ep number from DCCPARAMS register
[linux-2.6/kmemtrace.git] / drivers / usb / gadget / goku_udc.c
blobae931af05cef303521fbad67bfa858829c1fc359
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 #undef DEBUG
24 // #define VERBOSE /* extra debug messages (success too) */
25 // #define USB_TRACE /* packet-level success messages */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/slab.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
35 #include <linux/timer.h>
36 #include <linux/list.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/device.h>
40 #include <linux/usb/ch9.h>
41 #include <linux/usb_gadget.h>
42
43 #include <asm/byteorder.h>
44 #include <asm/io.h>
45 #include <asm/irq.h>
46 #include <asm/system.h>
47 #include <asm/unaligned.h>
48
49
50 #include "goku_udc.h"
51
52 #define DRIVER_DESC "TC86C001 USB Device Controller"
53 #define DRIVER_VERSION "30-Oct 2003"
54
55 #define DMA_ADDR_INVALID (~(dma_addr_t)0)
56
57 static const char driver_name [] = "goku_udc";
58 static const char driver_desc [] = DRIVER_DESC;
59
60 MODULE_AUTHOR("source@mvista.com");
61 MODULE_DESCRIPTION(DRIVER_DESC);
62 MODULE_LICENSE("GPL");
63
64
65 /*
66 * IN dma behaves ok under testing, though the IN-dma abort paths don't
67 * seem to behave quite as expected. Used by default.
68 *
69 * OUT dma documents design problems handling the common "short packet"
70 * transfer termination policy; it couldn't be enabled by default, even
71 * if the OUT-dma abort problems had a resolution.
72 */
73 static unsigned use_dma = 1;
74
75 #if 0
76 //#include <linux/moduleparam.h>
77 /* "modprobe goku_udc use_dma=1" etc
78 * 0 to disable dma
79 * 1 to use IN dma only (normal operation)
80 * 2 to use IN and OUT dma
81 */
82 module_param(use_dma, uint, S_IRUGO);
83 #endif
84
85 /*-------------------------------------------------------------------------*/
86
87 static void nuke(struct goku_ep *, int status);
88
89 static inline void
90 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
91 {
92 writel(COMMAND_EP(epnum) | command, &regs->Command);
93 udelay(300);
94 }
95
96 static int
97 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
98 {
99 struct goku_udc *dev;
100 struct goku_ep *ep;
101 u32 mode;
102 u16 max;
103 unsigned long flags;
104
105 ep = container_of(_ep, struct goku_ep, ep);
106 if (!_ep || !desc || ep->desc
107 || desc->bDescriptorType != USB_DT_ENDPOINT)
108 return -EINVAL;
109 dev = ep->dev;
110 if (ep == &dev->ep[0])
111 return -EINVAL;
112 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
113 return -ESHUTDOWN;
114 if (ep->num != (desc->bEndpointAddress & 0x0f))
115 return -EINVAL;
116
117 switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
118 case USB_ENDPOINT_XFER_BULK:
119 case USB_ENDPOINT_XFER_INT:
120 break;
121 default:
122 return -EINVAL;
123 }
124
125 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
126 != EPxSTATUS_EP_INVALID)
127 return -EBUSY;
128
129 /* enabling the no-toggle interrupt mode would need an api hook */
130 mode = 0;
131 max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
132 switch (max) {
133 case 64: mode++;
134 case 32: mode++;
135 case 16: mode++;
136 case 8: mode <<= 3;
137 break;
138 default:
139 return -EINVAL;
140 }
141 mode |= 2 << 1; /* bulk, or intr-with-toggle */
142
143 /* ep1/ep2 dma direction is chosen early; it works in the other
144 * direction, with pio. be cautious with out-dma.
145 */
146 ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
147 if (ep->is_in) {
148 mode |= 1;
149 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
150 } else {
151 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
152 if (ep->dma)
153 DBG(dev, "%s out-dma hides short packets\n",
154 ep->ep.name);
155 }
156
157 spin_lock_irqsave(&ep->dev->lock, flags);
158
159 /* ep1 and ep2 can do double buffering and/or dma */
160 if (ep->num < 3) {
161 struct goku_udc_regs __iomem *regs = ep->dev->regs;
162 u32 tmp;
163
164 /* double buffer except (for now) with pio in */
165 tmp = ((ep->dma || !ep->is_in)
166 ? 0x10 /* double buffered */
167 : 0x11 /* single buffer */
168 ) << ep->num;
169 tmp |= readl(&regs->EPxSingle);
170 writel(tmp, &regs->EPxSingle);
171
172 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
173 tmp |= readl(&regs->EPxBCS);
174 writel(tmp, &regs->EPxBCS);
175 }
176 writel(mode, ep->reg_mode);
177 command(ep->dev->regs, COMMAND_RESET, ep->num);
178 ep->ep.maxpacket = max;
179 ep->stopped = 0;
180 ep->desc = desc;
181 spin_unlock_irqrestore(&ep->dev->lock, flags);
182
183 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
184 ep->is_in ? "IN" : "OUT",
185 ep->dma ? "dma" : "pio",
186 max);
187
188 return 0;
189 }
190
191 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
192 {
193 struct goku_udc *dev = ep->dev;
194
195 if (regs) {
196 command(regs, COMMAND_INVALID, ep->num);
197 if (ep->num) {
198 if (ep->num == UDC_MSTWR_ENDPOINT)
199 dev->int_enable &= ~(INT_MSTWREND
200 |INT_MSTWRTMOUT);
201 else if (ep->num == UDC_MSTRD_ENDPOINT)
202 dev->int_enable &= ~INT_MSTRDEND;
203 dev->int_enable &= ~INT_EPxDATASET (ep->num);
204 } else
205 dev->int_enable &= ~INT_EP0;
206 writel(dev->int_enable, &regs->int_enable);
207 readl(&regs->int_enable);
208 if (ep->num < 3) {
209 struct goku_udc_regs __iomem *r = ep->dev->regs;
210 u32 tmp;
211
212 tmp = readl(&r->EPxSingle);
213 tmp &= ~(0x11 << ep->num);
214 writel(tmp, &r->EPxSingle);
215
216 tmp = readl(&r->EPxBCS);
217 tmp &= ~(0x11 << ep->num);
218 writel(tmp, &r->EPxBCS);
219 }
220 /* reset dma in case we're still using it */
221 if (ep->dma) {
222 u32 master;
223
224 master = readl(&regs->dma_master) & MST_RW_BITS;
225 if (ep->num == UDC_MSTWR_ENDPOINT) {
226 master &= ~MST_W_BITS;
227 master |= MST_WR_RESET;
228 } else {
229 master &= ~MST_R_BITS;
230 master |= MST_RD_RESET;
231 }
232 writel(master, &regs->dma_master);
233 }
234 }
235
236 ep->ep.maxpacket = MAX_FIFO_SIZE;
237 ep->desc = NULL;
238 ep->stopped = 1;
239 ep->irqs = 0;
240 ep->dma = 0;
241 }
242
243 static int goku_ep_disable(struct usb_ep *_ep)
244 {
245 struct goku_ep *ep;
246 struct goku_udc *dev;
247 unsigned long flags;
248
249 ep = container_of(_ep, struct goku_ep, ep);
250 if (!_ep || !ep->desc)
251 return -ENODEV;
252 dev = ep->dev;
253 if (dev->ep0state == EP0_SUSPEND)
254 return -EBUSY;
255
256 VDBG(dev, "disable %s\n", _ep->name);
257
258 spin_lock_irqsave(&dev->lock, flags);
259 nuke(ep, -ESHUTDOWN);
260 ep_reset(dev->regs, ep);
261 spin_unlock_irqrestore(&dev->lock, flags);
262
263 return 0;
264 }
265
266 /*-------------------------------------------------------------------------*/
267
268 static struct usb_request *
269 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
270 {
271 struct goku_request *req;
272
273 if (!_ep)
274 return NULL;
275 req = kzalloc(sizeof *req, gfp_flags);
276 if (!req)
277 return NULL;
278
279 req->req.dma = DMA_ADDR_INVALID;
280 INIT_LIST_HEAD(&req->queue);
281 return &req->req;
282 }
283
284 static void
285 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
286 {
287 struct goku_request *req;
288
289 if (!_ep || !_req)
290 return;
291
292 req = container_of(_req, struct goku_request, req);
293 WARN_ON(!list_empty(&req->queue));
294 kfree(req);
295 }
296
297 /*-------------------------------------------------------------------------*/
298
299 /* allocating buffers this way eliminates dma mapping overhead, which
300 * on some platforms will mean eliminating a per-io buffer copy. with
301 * some kinds of system caches, further tweaks may still be needed.
302 */
303 static void *
304 goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
305 dma_addr_t *dma, gfp_t gfp_flags)
306 {
307 void *retval;
308 struct goku_ep *ep;
309
310 ep = container_of(_ep, struct goku_ep, ep);
311 if (!_ep)
312 return NULL;
313 *dma = DMA_ADDR_INVALID;
314
315 if (ep->dma) {
316 /* the main problem with this call is that it wastes memory
317 * on typical 1/N page allocations: it allocates 1-N pages.
318 */
319 #warning Using dma_alloc_coherent even with buffers smaller than a page.
320 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
321 bytes, dma, gfp_flags);
322 } else
323 retval = kmalloc(bytes, gfp_flags);
324 return retval;
325 }
326
327 static void
328 goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
329 {
330 /* free memory into the right allocator */
331 if (dma != DMA_ADDR_INVALID) {
332 struct goku_ep *ep;
333
334 ep = container_of(_ep, struct goku_ep, ep);
335 if (!_ep)
336 return;
337 dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
338 } else
339 kfree (buf);
340 }
341
342 /*-------------------------------------------------------------------------*/
343
344 static void
345 done(struct goku_ep *ep, struct goku_request *req, int status)
346 {
347 struct goku_udc *dev;
348 unsigned stopped = ep->stopped;
349
350 list_del_init(&req->queue);
351
352 if (likely(req->req.status == -EINPROGRESS))
353 req->req.status = status;
354 else
355 status = req->req.status;
356
357 dev = ep->dev;
358 if (req->mapped) {
359 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
360 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
361 req->req.dma = DMA_ADDR_INVALID;
362 req->mapped = 0;
363 }
364
365 #ifndef USB_TRACE
366 if (status && status != -ESHUTDOWN)
367 #endif
368 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
369 ep->ep.name, &req->req, status,
370 req->req.actual, req->req.length);
371
372 /* don't modify queue heads during completion callback */
373 ep->stopped = 1;
374 spin_unlock(&dev->lock);
375 req->req.complete(&ep->ep, &req->req);
376 spin_lock(&dev->lock);
377 ep->stopped = stopped;
378 }
379
380 /*-------------------------------------------------------------------------*/
381
382 static inline int
383 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
384 {
385 unsigned length, count;
386
387 length = min(req->req.length - req->req.actual, max);
388 req->req.actual += length;
389
390 count = length;
391 while (likely(count--))
392 writel(*buf++, fifo);
393 return length;
394 }
395
396 // return: 0 = still running, 1 = completed, negative = errno
397 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
398 {
399 struct goku_udc *dev = ep->dev;
400 u32 tmp;
401 u8 *buf;
402 unsigned count;
403 int is_last;
404
405 tmp = readl(&dev->regs->DataSet);
406 buf = req->req.buf + req->req.actual;
407 prefetch(buf);
408
409 dev = ep->dev;
410 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
411 return -EL2HLT;
412
413 /* NOTE: just single-buffered PIO-IN for now. */
414 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
415 return 0;
416
417 /* clear our "packet available" irq */
418 if (ep->num != 0)
419 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
420
421 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
422
423 /* last packet often short (sometimes a zlp, especially on ep0) */
424 if (unlikely(count != ep->ep.maxpacket)) {
425 writel(~(1<<ep->num), &dev->regs->EOP);
426 if (ep->num == 0) {
427 dev->ep[0].stopped = 1;
428 dev->ep0state = EP0_STATUS;
429 }
430 is_last = 1;
431 } else {
432 if (likely(req->req.length != req->req.actual)
433 || req->req.zero)
434 is_last = 0;
435 else
436 is_last = 1;
437 }
438 #if 0 /* printk seemed to trash is_last...*/
439 //#ifdef USB_TRACE
440 VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
441 ep->ep.name, count, is_last ? "/last" : "",
442 req->req.length - req->req.actual, req);
443 #endif
444
445 /* requests complete when all IN data is in the FIFO,
446 * or sometimes later, if a zlp was needed.
447 */
448 if (is_last) {
449 done(ep, req, 0);
450 return 1;
451 }
452
453 return 0;
454 }
455
456 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
457 {
458 struct goku_udc_regs __iomem *regs;
459 u32 size, set;
460 u8 *buf;
461 unsigned bufferspace, is_short, dbuff;
462
463 regs = ep->dev->regs;
464 top:
465 buf = req->req.buf + req->req.actual;
466 prefetchw(buf);
467
468 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
469 return -EL2HLT;
470
471 dbuff = (ep->num == 1 || ep->num == 2);
472 do {
473 /* ack dataset irq matching the status we'll handle */
474 if (ep->num != 0)
475 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
476
477 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
478 size = readl(&regs->EPxSizeLA[ep->num]);
479 bufferspace = req->req.length - req->req.actual;
480
481 /* usually do nothing without an OUT packet */
482 if (likely(ep->num != 0 || bufferspace != 0)) {
483 if (unlikely(set == 0))
484 break;
485 /* use ep1/ep2 double-buffering for OUT */
486 if (!(size & PACKET_ACTIVE))
487 size = readl(&regs->EPxSizeLB[ep->num]);
488 if (!(size & PACKET_ACTIVE)) // "can't happen"
489 break;
490 size &= DATASIZE; /* EPxSizeH == 0 */
491
492 /* ep0out no-out-data case for set_config, etc */
493 } else
494 size = 0;
495
496 /* read all bytes from this packet */
497 req->req.actual += size;
498 is_short = (size < ep->ep.maxpacket);
499 #ifdef USB_TRACE
500 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
501 ep->ep.name, size, is_short ? "/S" : "",
502 req, req->req.actual, req->req.length);
503 #endif
504 while (likely(size-- != 0)) {
505 u8 byte = (u8) readl(ep->reg_fifo);
506
507 if (unlikely(bufferspace == 0)) {
508 /* this happens when the driver's buffer
509 * is smaller than what the host sent.
510 * discard the extra data in this packet.
511 */
512 if (req->req.status != -EOVERFLOW)
513 DBG(ep->dev, "%s overflow %u\n",
514 ep->ep.name, size);
515 req->req.status = -EOVERFLOW;
516 } else {
517 *buf++ = byte;
518 bufferspace--;
519 }
520 }
521
522 /* completion */
523 if (unlikely(is_short || req->req.actual == req->req.length)) {
524 if (unlikely(ep->num == 0)) {
525 /* non-control endpoints now usable? */
526 if (ep->dev->req_config)
527 writel(ep->dev->configured
528 ? USBSTATE_CONFIGURED
529 : 0,
530 &regs->UsbState);
531 /* ep0out status stage */
532 writel(~(1<<0), &regs->EOP);
533 ep->stopped = 1;
534 ep->dev->ep0state = EP0_STATUS;
535 }
536 done(ep, req, 0);
537
538 /* empty the second buffer asap */
539 if (dbuff && !list_empty(&ep->queue)) {
540 req = list_entry(ep->queue.next,
541 struct goku_request, queue);
542 goto top;
543 }
544 return 1;
545 }
546 } while (dbuff);
547 return 0;
548 }
549
550 static inline void
551 pio_irq_enable(struct goku_udc *dev,
552 struct goku_udc_regs __iomem *regs, int epnum)
553 {
554 dev->int_enable |= INT_EPxDATASET (epnum);
555 writel(dev->int_enable, &regs->int_enable);
556 /* write may still be posted */
557 }
558
559 static inline void
560 pio_irq_disable(struct goku_udc *dev,
561 struct goku_udc_regs __iomem *regs, int epnum)
562 {
563 dev->int_enable &= ~INT_EPxDATASET (epnum);
564 writel(dev->int_enable, &regs->int_enable);
565 /* write may still be posted */
566 }
567
568 static inline void
569 pio_advance(struct goku_ep *ep)
570 {
571 struct goku_request *req;
572
573 if (unlikely(list_empty (&ep->queue)))
574 return;
575 req = list_entry(ep->queue.next, struct goku_request, queue);
576 (ep->is_in ? write_fifo : read_fifo)(ep, req);
577 }
578
579
580 /*-------------------------------------------------------------------------*/
581
582 // return: 0 = q running, 1 = q stopped, negative = errno
583 static int start_dma(struct goku_ep *ep, struct goku_request *req)
584 {
585 struct goku_udc_regs __iomem *regs = ep->dev->regs;
586 u32 master;
587 u32 start = req->req.dma;
588 u32 end = start + req->req.length - 1;
589
590 master = readl(&regs->dma_master) & MST_RW_BITS;
591
592 /* re-init the bits affecting IN dma; careful with zlps */
593 if (likely(ep->is_in)) {
594 if (unlikely(master & MST_RD_ENA)) {
595 DBG (ep->dev, "start, IN active dma %03x!!\n",
596 master);
597 // return -EL2HLT;
598 }
599 writel(end, &regs->in_dma_end);
600 writel(start, &regs->in_dma_start);
601
602 master &= ~MST_R_BITS;
603 if (unlikely(req->req.length == 0))
604 master = MST_RD_ENA | MST_RD_EOPB;
605 else if ((req->req.length % ep->ep.maxpacket) != 0
606 || req->req.zero)
607 master = MST_RD_ENA | MST_EOPB_ENA;
608 else
609 master = MST_RD_ENA | MST_EOPB_DIS;
610
611 ep->dev->int_enable |= INT_MSTRDEND;
612
613 /* Goku DMA-OUT merges short packets, which plays poorly with
614 * protocols where short packets mark the transfer boundaries.
615 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
616 * ending transfers after 3 SOFs; we don't turn it on.
617 */
618 } else {
619 if (unlikely(master & MST_WR_ENA)) {
620 DBG (ep->dev, "start, OUT active dma %03x!!\n",
621 master);
622 // return -EL2HLT;
623 }
624 writel(end, &regs->out_dma_end);
625 writel(start, &regs->out_dma_start);
626
627 master &= ~MST_W_BITS;
628 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
629
630 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
631 }
632
633 writel(master, &regs->dma_master);
634 writel(ep->dev->int_enable, &regs->int_enable);
635 return 0;
636 }
637
638 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
639 {
640 struct goku_request *req;
641 struct goku_udc_regs __iomem *regs = ep->dev->regs;
642 u32 master;
643
644 master = readl(&regs->dma_master);
645
646 if (unlikely(list_empty(&ep->queue))) {
647 stop:
648 if (ep->is_in)
649 dev->int_enable &= ~INT_MSTRDEND;
650 else
651 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
652 writel(dev->int_enable, &regs->int_enable);
653 return;
654 }
655 req = list_entry(ep->queue.next, struct goku_request, queue);
656
657 /* normal hw dma completion (not abort) */
658 if (likely(ep->is_in)) {
659 if (unlikely(master & MST_RD_ENA))
660 return;
661 req->req.actual = readl(&regs->in_dma_current);
662 } else {
663 if (unlikely(master & MST_WR_ENA))
664 return;
665
666 /* hardware merges short packets, and also hides packet
667 * overruns. a partial packet MAY be in the fifo here.
668 */
669 req->req.actual = readl(&regs->out_dma_current);
670 }
671 req->req.actual -= req->req.dma;
672 req->req.actual++;
673
674 #ifdef USB_TRACE
675 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
676 ep->ep.name, ep->is_in ? "IN" : "OUT",
677 req->req.actual, req->req.length, req);
678 #endif
679 done(ep, req, 0);
680 if (list_empty(&ep->queue))
681 goto stop;
682 req = list_entry(ep->queue.next, struct goku_request, queue);
683 (void) start_dma(ep, req);
684 }
685
686 static void abort_dma(struct goku_ep *ep, int status)
687 {
688 struct goku_udc_regs __iomem *regs = ep->dev->regs;
689 struct goku_request *req;
690 u32 curr, master;
691
692 /* NAK future host requests, hoping the implicit delay lets the
693 * dma engine finish reading (or writing) its latest packet and
694 * empty the dma buffer (up to 16 bytes).
695 *
696 * This avoids needing to clean up a partial packet in the fifo;
697 * we can't do that for IN without side effects to HALT and TOGGLE.
698 */
699 command(regs, COMMAND_FIFO_DISABLE, ep->num);
700 req = list_entry(ep->queue.next, struct goku_request, queue);
701 master = readl(&regs->dma_master) & MST_RW_BITS;
702
703 /* FIXME using these resets isn't usably documented. this may
704 * not work unless it's followed by disabling the endpoint.
705 *
706 * FIXME the OUT reset path doesn't even behave consistently.
707 */
708 if (ep->is_in) {
709 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
710 goto finished;
711 curr = readl(&regs->in_dma_current);
712
713 writel(curr, &regs->in_dma_end);
714 writel(curr, &regs->in_dma_start);
715
716 master &= ~MST_R_BITS;
717 master |= MST_RD_RESET;
718 writel(master, &regs->dma_master);
719
720 if (readl(&regs->dma_master) & MST_RD_ENA)
721 DBG(ep->dev, "IN dma active after reset!\n");
722
723 } else {
724 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
725 goto finished;
726 curr = readl(&regs->out_dma_current);
727
728 writel(curr, &regs->out_dma_end);
729 writel(curr, &regs->out_dma_start);
730
731 master &= ~MST_W_BITS;
732 master |= MST_WR_RESET;
733 writel(master, &regs->dma_master);
734
735 if (readl(&regs->dma_master) & MST_WR_ENA)
736 DBG(ep->dev, "OUT dma active after reset!\n");
737 }
738 req->req.actual = (curr - req->req.dma) + 1;
739 req->req.status = status;
740
741 VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
742 ep->is_in ? "IN" : "OUT",
743 req->req.actual, req->req.length);
744
745 command(regs, COMMAND_FIFO_ENABLE, ep->num);
746
747 return;
748
749 finished:
750 /* dma already completed; no abort needed */
751 command(regs, COMMAND_FIFO_ENABLE, ep->num);
752 req->req.actual = req->req.length;
753 req->req.status = 0;
754 }
755
756 /*-------------------------------------------------------------------------*/
757
758 static int
759 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
760 {
761 struct goku_request *req;
762 struct goku_ep *ep;
763 struct goku_udc *dev;
764 unsigned long flags;
765 int status;
766
767 /* always require a cpu-view buffer so pio works */
768 req = container_of(_req, struct goku_request, req);
769 if (unlikely(!_req || !_req->complete
770 || !_req->buf || !list_empty(&req->queue)))
771 return -EINVAL;
772 ep = container_of(_ep, struct goku_ep, ep);
773 if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
774 return -EINVAL;
775 dev = ep->dev;
776 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
777 return -ESHUTDOWN;
778
779 /* can't touch registers when suspended */
780 if (dev->ep0state == EP0_SUSPEND)
781 return -EBUSY;
782
783 /* set up dma mapping in case the caller didn't */
784 if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
785 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
786 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
787 req->mapped = 1;
788 }
789
790 #ifdef USB_TRACE
791 VDBG(dev, "%s queue req %p, len %u buf %p\n",
792 _ep->name, _req, _req->length, _req->buf);
793 #endif
794
795 spin_lock_irqsave(&dev->lock, flags);
796
797 _req->status = -EINPROGRESS;
798 _req->actual = 0;
799
800 /* for ep0 IN without premature status, zlp is required and
801 * writing EOP starts the status stage (OUT).
802 */
803 if (unlikely(ep->num == 0 && ep->is_in))
804 _req->zero = 1;
805
806 /* kickstart this i/o queue? */
807 status = 0;
808 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
809 /* dma: done after dma completion IRQ (or error)
810 * pio: done after last fifo operation
811 */
812 if (ep->dma)
813 status = start_dma(ep, req);
814 else
815 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
816
817 if (unlikely(status != 0)) {
818 if (status > 0)
819 status = 0;
820 req = NULL;
821 }
822
823 } /* else pio or dma irq handler advances the queue. */
824
825 if (likely(req != 0))
826 list_add_tail(&req->queue, &ep->queue);
827
828 if (likely(!list_empty(&ep->queue))
829 && likely(ep->num != 0)
830 && !ep->dma
831 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
832 pio_irq_enable(dev, dev->regs, ep->num);
833
834 spin_unlock_irqrestore(&dev->lock, flags);
835
836 /* pci writes may still be posted */
837 return status;
838 }
839
840 /* dequeue ALL requests */
841 static void nuke(struct goku_ep *ep, int status)
842 {
843 struct goku_request *req;
844
845 ep->stopped = 1;
846 if (list_empty(&ep->queue))
847 return;
848 if (ep->dma)
849 abort_dma(ep, status);
850 while (!list_empty(&ep->queue)) {
851 req = list_entry(ep->queue.next, struct goku_request, queue);
852 done(ep, req, status);
853 }
854 }
855
856 /* dequeue JUST ONE request */
857 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
858 {
859 struct goku_request *req;
860 struct goku_ep *ep;
861 struct goku_udc *dev;
862 unsigned long flags;
863
864 ep = container_of(_ep, struct goku_ep, ep);
865 if (!_ep || !_req || (!ep->desc && ep->num != 0))
866 return -EINVAL;
867 dev = ep->dev;
868 if (!dev->driver)
869 return -ESHUTDOWN;
870
871 /* we can't touch (dma) registers when suspended */
872 if (dev->ep0state == EP0_SUSPEND)
873 return -EBUSY;
874
875 VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
876 ep->is_in ? "IN" : "OUT",
877 ep->dma ? "dma" : "pio",
878 _req);
879
880 spin_lock_irqsave(&dev->lock, flags);
881
882 /* make sure it's actually queued on this endpoint */
883 list_for_each_entry (req, &ep->queue, queue) {
884 if (&req->req == _req)
885 break;
886 }
887 if (&req->req != _req) {
888 spin_unlock_irqrestore (&dev->lock, flags);
889 return -EINVAL;
890 }
891
892 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
893 abort_dma(ep, -ECONNRESET);
894 done(ep, req, -ECONNRESET);
895 dma_advance(dev, ep);
896 } else if (!list_empty(&req->queue))
897 done(ep, req, -ECONNRESET);
898 else
899 req = NULL;
900 spin_unlock_irqrestore(&dev->lock, flags);
901
902 return req ? 0 : -EOPNOTSUPP;
903 }
904
905 /*-------------------------------------------------------------------------*/
906
907 static void goku_clear_halt(struct goku_ep *ep)
908 {
909 // assert (ep->num !=0)
910 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
911 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
912 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
913 if (ep->stopped) {
914 ep->stopped = 0;
915 if (ep->dma) {
916 struct goku_request *req;
917
918 if (list_empty(&ep->queue))
919 return;
920 req = list_entry(ep->queue.next, struct goku_request,
921 queue);
922 (void) start_dma(ep, req);
923 } else
924 pio_advance(ep);
925 }
926 }
927
928 static int goku_set_halt(struct usb_ep *_ep, int value)
929 {
930 struct goku_ep *ep;
931 unsigned long flags;
932 int retval = 0;
933
934 if (!_ep)
935 return -ENODEV;
936 ep = container_of (_ep, struct goku_ep, ep);
937
938 if (ep->num == 0) {
939 if (value) {
940 ep->dev->ep0state = EP0_STALL;
941 ep->dev->ep[0].stopped = 1;
942 } else
943 return -EINVAL;
944
945 /* don't change EPxSTATUS_EP_INVALID to READY */
946 } else if (!ep->desc) {
947 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
948 return -EINVAL;
949 }
950
951 spin_lock_irqsave(&ep->dev->lock, flags);
952 if (!list_empty(&ep->queue))
953 retval = -EAGAIN;
954 else if (ep->is_in && value
955 /* data in (either) packet buffer? */
956 && (readl(&ep->dev->regs->DataSet)
957 & DATASET_AB(ep->num)))
958 retval = -EAGAIN;
959 else if (!value)
960 goku_clear_halt(ep);
961 else {
962 ep->stopped = 1;
963 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
964 command(ep->dev->regs, COMMAND_STALL, ep->num);
965 readl(ep->reg_status);
966 }
967 spin_unlock_irqrestore(&ep->dev->lock, flags);
968 return retval;
969 }
970
971 static int goku_fifo_status(struct usb_ep *_ep)
972 {
973 struct goku_ep *ep;
974 struct goku_udc_regs __iomem *regs;
975 u32 size;
976
977 if (!_ep)
978 return -ENODEV;
979 ep = container_of(_ep, struct goku_ep, ep);
980
981 /* size is only reported sanely for OUT */
982 if (ep->is_in)
983 return -EOPNOTSUPP;
984
985 /* ignores 16-byte dma buffer; SizeH == 0 */
986 regs = ep->dev->regs;
987 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
988 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
989 VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
990 return size;
991 }
992
993 static void goku_fifo_flush(struct usb_ep *_ep)
994 {
995 struct goku_ep *ep;
996 struct goku_udc_regs __iomem *regs;
997 u32 size;
998
999 if (!_ep)
1000 return;
1001 ep = container_of(_ep, struct goku_ep, ep);
1002 VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
1003
1004 /* don't change EPxSTATUS_EP_INVALID to READY */
1005 if (!ep->desc && ep->num != 0) {
1006 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
1007 return;
1008 }
1009
1010 regs = ep->dev->regs;
1011 size = readl(&regs->EPxSizeLA[ep->num]);
1012 size &= DATASIZE;
1013
1014 /* Non-desirable behavior: FIFO_CLEAR also clears the
1015 * endpoint halt feature. For OUT, we _could_ just read
1016 * the bytes out (PIO, if !ep->dma); for in, no choice.
1017 */
1018 if (size)
1019 command(regs, COMMAND_FIFO_CLEAR, ep->num);
1020 }
1021
1022 static struct usb_ep_ops goku_ep_ops = {
1023 .enable = goku_ep_enable,
1024 .disable = goku_ep_disable,
1025
1026 .alloc_request = goku_alloc_request,
1027 .free_request = goku_free_request,
1028
1029 .alloc_buffer = goku_alloc_buffer,
1030 .free_buffer = goku_free_buffer,
1031
1032 .queue = goku_queue,
1033 .dequeue = goku_dequeue,
1034
1035 .set_halt = goku_set_halt,
1036 .fifo_status = goku_fifo_status,
1037 .fifo_flush = goku_fifo_flush,
1038 };
1039
1040 /*-------------------------------------------------------------------------*/
1041
1042 static int goku_get_frame(struct usb_gadget *_gadget)
1043 {
1044 return -EOPNOTSUPP;
1045 }
1046
1047 static const struct usb_gadget_ops goku_ops = {
1048 .get_frame = goku_get_frame,
1049 // no remote wakeup
1050 // not selfpowered
1051 };
1052
1053 /*-------------------------------------------------------------------------*/
1054
1055 static inline char *dmastr(void)
1056 {
1057 if (use_dma == 0)
1058 return "(dma disabled)";
1059 else if (use_dma == 2)
1060 return "(dma IN and OUT)";
1061 else
1062 return "(dma IN)";
1063 }
1064
1065 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1066
1067 static const char proc_node_name [] = "driver/udc";
1068
1069 #define FOURBITS "%s%s%s%s"
1070 #define EIGHTBITS FOURBITS FOURBITS
1071
1072 static void
1073 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1074 {
1075 int t;
1076
1077 /* int_status is the same format ... */
1078 t = scnprintf(*next, *size,
1079 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1080 label, mask,
1081 (mask & INT_PWRDETECT) ? " power" : "",
1082 (mask & INT_SYSERROR) ? " sys" : "",
1083 (mask & INT_MSTRDEND) ? " in-dma" : "",
1084 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1085
1086 (mask & INT_MSTWREND) ? " out-dma" : "",
1087 (mask & INT_MSTWRSET) ? " wrset" : "",
1088 (mask & INT_ERR) ? " err" : "",
1089 (mask & INT_SOF) ? " sof" : "",
1090
1091 (mask & INT_EP3NAK) ? " ep3nak" : "",
1092 (mask & INT_EP2NAK) ? " ep2nak" : "",
1093 (mask & INT_EP1NAK) ? " ep1nak" : "",
1094 (mask & INT_EP3DATASET) ? " ep3" : "",
1095
1096 (mask & INT_EP2DATASET) ? " ep2" : "",
1097 (mask & INT_EP1DATASET) ? " ep1" : "",
1098 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1099 (mask & INT_STATUS) ? " ep0status" : "",
1100
1101 (mask & INT_SETUP) ? " setup" : "",
1102 (mask & INT_ENDPOINT0) ? " ep0" : "",
1103 (mask & INT_USBRESET) ? " reset" : "",
1104 (mask & INT_SUSPEND) ? " suspend" : "");
1105 *size -= t;
1106 *next += t;
1107 }
1108
1109
1110 static int
1111 udc_proc_read(char *buffer, char **start, off_t off, int count,
1112 int *eof, void *_dev)
1113 {
1114 char *buf = buffer;
1115 struct goku_udc *dev = _dev;
1116 struct goku_udc_regs __iomem *regs = dev->regs;
1117 char *next = buf;
1118 unsigned size = count;
1119 unsigned long flags;
1120 int i, t, is_usb_connected;
1121 u32 tmp;
1122
1123 if (off != 0)
1124 return 0;
1125
1126 local_irq_save(flags);
1127
1128 /* basic device status */
1129 tmp = readl(&regs->power_detect);
1130 is_usb_connected = tmp & PW_DETECT;
1131 t = scnprintf(next, size,
1132 "%s - %s\n"
1133 "%s version: %s %s\n"
1134 "Gadget driver: %s\n"
1135 "Host %s, %s\n"
1136 "\n",
1137 pci_name(dev->pdev), driver_desc,
1138 driver_name, DRIVER_VERSION, dmastr(),
1139 dev->driver ? dev->driver->driver.name : "(none)",
1140 is_usb_connected
1141 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1142 : "disconnected",
1143 ({char *tmp;
1144 switch(dev->ep0state){
1145 case EP0_DISCONNECT: tmp = "ep0_disconnect"; break;
1146 case EP0_IDLE: tmp = "ep0_idle"; break;
1147 case EP0_IN: tmp = "ep0_in"; break;
1148 case EP0_OUT: tmp = "ep0_out"; break;
1149 case EP0_STATUS: tmp = "ep0_status"; break;
1150 case EP0_STALL: tmp = "ep0_stall"; break;
1151 case EP0_SUSPEND: tmp = "ep0_suspend"; break;
1152 default: tmp = "ep0_?"; break;
1153 } tmp; })
1154 );
1155 size -= t;
1156 next += t;
1157
1158 dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1159 dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1160
1161 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1162 goto done;
1163
1164 /* registers for (active) device and ep0 */
1165 t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1166 "single.bcs %02x.%02x state %x addr %u\n",
1167 dev->irqs, readl(&regs->DataSet),
1168 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1169 readl(&regs->UsbState),
1170 readl(&regs->address));
1171 size -= t;
1172 next += t;
1173
1174 tmp = readl(&regs->dma_master);
1175 t = scnprintf(next, size,
1176 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1177 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1178 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1179 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1180 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1181
1182 (tmp & MST_RD_EOPB) ? " eopb" : "",
1183 (tmp & MST_RD_RESET) ? " in_reset" : "",
1184 (tmp & MST_WR_RESET) ? " out_reset" : "",
1185 (tmp & MST_RD_ENA) ? " IN" : "",
1186
1187 (tmp & MST_WR_ENA) ? " OUT" : "",
1188 (tmp & MST_CONNECTION)
1189 ? "ep1in/ep2out"
1190 : "ep1out/ep2in");
1191 size -= t;
1192 next += t;
1193
1194 /* dump endpoint queues */
1195 for (i = 0; i < 4; i++) {
1196 struct goku_ep *ep = &dev->ep [i];
1197 struct goku_request *req;
1198 int t;
1199
1200 if (i && !ep->desc)
1201 continue;
1202
1203 tmp = readl(ep->reg_status);
1204 t = scnprintf(next, size,
1205 "%s %s max %u %s, irqs %lu, "
1206 "status %02x (%s) " FOURBITS "\n",
1207 ep->ep.name,
1208 ep->is_in ? "in" : "out",
1209 ep->ep.maxpacket,
1210 ep->dma ? "dma" : "pio",
1211 ep->irqs,
1212 tmp, ({ char *s;
1213 switch (tmp & EPxSTATUS_EP_MASK) {
1214 case EPxSTATUS_EP_READY:
1215 s = "ready"; break;
1216 case EPxSTATUS_EP_DATAIN:
1217 s = "packet"; break;
1218 case EPxSTATUS_EP_FULL:
1219 s = "full"; break;
1220 case EPxSTATUS_EP_TX_ERR: // host will retry
1221 s = "tx_err"; break;
1222 case EPxSTATUS_EP_RX_ERR:
1223 s = "rx_err"; break;
1224 case EPxSTATUS_EP_BUSY: /* ep0 only */
1225 s = "busy"; break;
1226 case EPxSTATUS_EP_STALL:
1227 s = "stall"; break;
1228 case EPxSTATUS_EP_INVALID: // these "can't happen"
1229 s = "invalid"; break;
1230 default:
1231 s = "?"; break;
1232 }; s; }),
1233 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1234 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1235 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1236 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1237 );
1238 if (t <= 0 || t > size)
1239 goto done;
1240 size -= t;
1241 next += t;
1242
1243 if (list_empty(&ep->queue)) {
1244 t = scnprintf(next, size, "\t(nothing queued)\n");
1245 if (t <= 0 || t > size)
1246 goto done;
1247 size -= t;
1248 next += t;
1249 continue;
1250 }
1251 list_for_each_entry(req, &ep->queue, queue) {
1252 if (ep->dma && req->queue.prev == &ep->queue) {
1253 if (i == UDC_MSTRD_ENDPOINT)
1254 tmp = readl(&regs->in_dma_current);
1255 else
1256 tmp = readl(&regs->out_dma_current);
1257 tmp -= req->req.dma;
1258 tmp++;
1259 } else
1260 tmp = req->req.actual;
1261
1262 t = scnprintf(next, size,
1263 "\treq %p len %u/%u buf %p\n",
1264 &req->req, tmp, req->req.length,
1265 req->req.buf);
1266 if (t <= 0 || t > size)
1267 goto done;
1268 size -= t;
1269 next += t;
1270 }
1271 }
1272
1273 done:
1274 local_irq_restore(flags);
1275 *eof = 1;
1276 return count - size;
1277 }
1278
1279 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1280
1281 /*-------------------------------------------------------------------------*/
1282
1283 static void udc_reinit (struct goku_udc *dev)
1284 {
1285 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1286
1287 unsigned i;
1288
1289 INIT_LIST_HEAD (&dev->gadget.ep_list);
1290 dev->gadget.ep0 = &dev->ep [0].ep;
1291 dev->gadget.speed = USB_SPEED_UNKNOWN;
1292 dev->ep0state = EP0_DISCONNECT;
1293 dev->irqs = 0;
1294
1295 for (i = 0; i < 4; i++) {
1296 struct goku_ep *ep = &dev->ep[i];
1297
1298 ep->num = i;
1299 ep->ep.name = names[i];
1300 ep->reg_fifo = &dev->regs->ep_fifo [i];
1301 ep->reg_status = &dev->regs->ep_status [i];
1302 ep->reg_mode = &dev->regs->ep_mode[i];
1303
1304 ep->ep.ops = &goku_ep_ops;
1305 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1306 ep->dev = dev;
1307 INIT_LIST_HEAD (&ep->queue);
1308
1309 ep_reset(NULL, ep);
1310 }
1311
1312 dev->ep[0].reg_mode = NULL;
1313 dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1314 list_del_init (&dev->ep[0].ep.ep_list);
1315 }
1316
1317 static void udc_reset(struct goku_udc *dev)
1318 {
1319 struct goku_udc_regs __iomem *regs = dev->regs;
1320
1321 writel(0, &regs->power_detect);
1322 writel(0, &regs->int_enable);
1323 readl(&regs->int_enable);
1324 dev->int_enable = 0;
1325
1326 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1327 * don't let INT_PWRDETECT sequence begin
1328 */
1329 udelay(250);
1330 writel(PW_RESETB, &regs->power_detect);
1331 readl(&regs->int_enable);
1332 }
1333
1334 static void ep0_start(struct goku_udc *dev)
1335 {
1336 struct goku_udc_regs __iomem *regs = dev->regs;
1337 unsigned i;
1338
1339 VDBG(dev, "%s\n", __FUNCTION__);
1340
1341 udc_reset(dev);
1342 udc_reinit (dev);
1343 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1344
1345 /* hw handles set_address, set_feature, get_status; maybe more */
1346 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1347 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1348 | G_REQMODE_GET_DESC
1349 | G_REQMODE_CLEAR_FEAT
1350 , &regs->reqmode);
1351
1352 for (i = 0; i < 4; i++)
1353 dev->ep[i].irqs = 0;
1354
1355 /* can't modify descriptors after writing UsbReady */
1356 for (i = 0; i < DESC_LEN; i++)
1357 writel(0, &regs->descriptors[i]);
1358 writel(0, &regs->UsbReady);
1359
1360 /* expect ep0 requests when the host drops reset */
1361 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1362 dev->int_enable = INT_DEVWIDE | INT_EP0;
1363 writel(dev->int_enable, &dev->regs->int_enable);
1364 readl(&regs->int_enable);
1365 dev->gadget.speed = USB_SPEED_FULL;
1366 dev->ep0state = EP0_IDLE;
1367 }
1368
1369 static void udc_enable(struct goku_udc *dev)
1370 {
1371 /* start enumeration now, or after power detect irq */
1372 if (readl(&dev->regs->power_detect) & PW_DETECT)
1373 ep0_start(dev);
1374 else {
1375 DBG(dev, "%s\n", __FUNCTION__);
1376 dev->int_enable = INT_PWRDETECT;
1377 writel(dev->int_enable, &dev->regs->int_enable);
1378 }
1379 }
1380
1381 /*-------------------------------------------------------------------------*/
1382
1383 /* keeping it simple:
1384 * - one bus driver, initted first;
1385 * - one function driver, initted second
1386 */
1387
1388 static struct goku_udc *the_controller;
1389
1390 /* when a driver is successfully registered, it will receive
1391 * control requests including set_configuration(), which enables
1392 * non-control requests. then usb traffic follows until a
1393 * disconnect is reported. then a host may connect again, or
1394 * the driver might get unbound.
1395 */
1396 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1397 {
1398 struct goku_udc *dev = the_controller;
1399 int retval;
1400
1401 if (!driver
1402 || driver->speed != USB_SPEED_FULL
1403 || !driver->bind
1404 || !driver->disconnect
1405 || !driver->setup)
1406 return -EINVAL;
1407 if (!dev)
1408 return -ENODEV;
1409 if (dev->driver)
1410 return -EBUSY;
1411
1412 /* hook up the driver */
1413 driver->driver.bus = NULL;
1414 dev->driver = driver;
1415 dev->gadget.dev.driver = &driver->driver;
1416 retval = driver->bind(&dev->gadget);
1417 if (retval) {
1418 DBG(dev, "bind to driver %s --> error %d\n",
1419 driver->driver.name, retval);
1420 dev->driver = NULL;
1421 dev->gadget.dev.driver = NULL;
1422 return retval;
1423 }
1424
1425 /* then enable host detection and ep0; and we're ready
1426 * for set_configuration as well as eventual disconnect.
1427 */
1428 udc_enable(dev);
1429
1430 DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1431 return 0;
1432 }
1433 EXPORT_SYMBOL(usb_gadget_register_driver);
1434
1435 static void
1436 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1437 {
1438 unsigned i;
1439
1440 DBG (dev, "%s\n", __FUNCTION__);
1441
1442 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1443 driver = NULL;
1444
1445 /* disconnect gadget driver after quiesceing hw and the driver */
1446 udc_reset (dev);
1447 for (i = 0; i < 4; i++)
1448 nuke(&dev->ep [i], -ESHUTDOWN);
1449 if (driver) {
1450 spin_unlock(&dev->lock);
1451 driver->disconnect(&dev->gadget);
1452 spin_lock(&dev->lock);
1453 }
1454
1455 if (dev->driver)
1456 udc_enable(dev);
1457 }
1458
1459 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1460 {
1461 struct goku_udc *dev = the_controller;
1462 unsigned long flags;
1463
1464 if (!dev)
1465 return -ENODEV;
1466 if (!driver || driver != dev->driver || !driver->unbind)
1467 return -EINVAL;
1468
1469 spin_lock_irqsave(&dev->lock, flags);
1470 dev->driver = NULL;
1471 stop_activity(dev, driver);
1472 spin_unlock_irqrestore(&dev->lock, flags);
1473
1474 driver->unbind(&dev->gadget);
1475
1476 DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1477 return 0;
1478 }
1479 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1480
1481
1482 /*-------------------------------------------------------------------------*/
1483
1484 static void ep0_setup(struct goku_udc *dev)
1485 {
1486 struct goku_udc_regs __iomem *regs = dev->regs;
1487 struct usb_ctrlrequest ctrl;
1488 int tmp;
1489
1490 /* read SETUP packet and enter DATA stage */
1491 ctrl.bRequestType = readl(&regs->bRequestType);
1492 ctrl.bRequest = readl(&regs->bRequest);
1493 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1494 | readl(&regs->wValueL));
1495 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1496 | readl(&regs->wIndexL));
1497 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1498 | readl(&regs->wLengthL));
1499 writel(0, &regs->SetupRecv);
1500
1501 nuke(&dev->ep[0], 0);
1502 dev->ep[0].stopped = 0;
1503 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1504 dev->ep[0].is_in = 1;
1505 dev->ep0state = EP0_IN;
1506 /* detect early status stages */
1507 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1508 } else {
1509 dev->ep[0].is_in = 0;
1510 dev->ep0state = EP0_OUT;
1511
1512 /* NOTE: CLEAR_FEATURE is done in software so that we can
1513 * synchronize transfer restarts after bulk IN stalls. data
1514 * won't even enter the fifo until the halt is cleared.
1515 */
1516 switch (ctrl.bRequest) {
1517 case USB_REQ_CLEAR_FEATURE:
1518 switch (ctrl.bRequestType) {
1519 case USB_RECIP_ENDPOINT:
1520 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1521 /* active endpoint */
1522 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1523 goto stall;
1524 if (ctrl.wIndex & __constant_cpu_to_le16(
1525 USB_DIR_IN)) {
1526 if (!dev->ep[tmp].is_in)
1527 goto stall;
1528 } else {
1529 if (dev->ep[tmp].is_in)
1530 goto stall;
1531 }
1532 if (ctrl.wValue != __constant_cpu_to_le16(
1533 USB_ENDPOINT_HALT))
1534 goto stall;
1535 if (tmp)
1536 goku_clear_halt(&dev->ep[tmp]);
1537 succeed:
1538 /* start ep0out status stage */
1539 writel(~(1<<0), &regs->EOP);
1540 dev->ep[0].stopped = 1;
1541 dev->ep0state = EP0_STATUS;
1542 return;
1543 case USB_RECIP_DEVICE:
1544 /* device remote wakeup: always clear */
1545 if (ctrl.wValue != __constant_cpu_to_le16(1))
1546 goto stall;
1547 VDBG(dev, "clear dev remote wakeup\n");
1548 goto succeed;
1549 case USB_RECIP_INTERFACE:
1550 goto stall;
1551 default: /* pass to gadget driver */
1552 break;
1553 }
1554 break;
1555 default:
1556 break;
1557 }
1558 }
1559
1560 #ifdef USB_TRACE
1561 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1562 ctrl.bRequestType, ctrl.bRequest,
1563 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1564 le16_to_cpu(ctrl.wLength));
1565 #endif
1566
1567 /* hw wants to know when we're configured (or not) */
1568 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1569 && ctrl.bRequestType == USB_RECIP_DEVICE);
1570 if (unlikely(dev->req_config))
1571 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1572
1573 /* delegate everything to the gadget driver.
1574 * it may respond after this irq handler returns.
1575 */
1576 spin_unlock (&dev->lock);
1577 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1578 spin_lock (&dev->lock);
1579 if (unlikely(tmp < 0)) {
1580 stall:
1581 #ifdef USB_TRACE
1582 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1583 ctrl.bRequestType, ctrl.bRequest, tmp);
1584 #endif
1585 command(regs, COMMAND_STALL, 0);
1586 dev->ep[0].stopped = 1;
1587 dev->ep0state = EP0_STALL;
1588 }
1589
1590 /* expect at least one data or status stage irq */
1591 }
1592
1593 #define ACK(irqbit) { \
1594 stat &= ~irqbit; \
1595 writel(~irqbit, &regs->int_status); \
1596 handled = 1; \
1597 }
1598
1599 static irqreturn_t goku_irq(int irq, void *_dev)
1600 {
1601 struct goku_udc *dev = _dev;
1602 struct goku_udc_regs __iomem *regs = dev->regs;
1603 struct goku_ep *ep;
1604 u32 stat, handled = 0;
1605 unsigned i, rescans = 5;
1606
1607 spin_lock(&dev->lock);
1608
1609 rescan:
1610 stat = readl(&regs->int_status) & dev->int_enable;
1611 if (!stat)
1612 goto done;
1613 dev->irqs++;
1614
1615 /* device-wide irqs */
1616 if (unlikely(stat & INT_DEVWIDE)) {
1617 if (stat & INT_SYSERROR) {
1618 ERROR(dev, "system error\n");
1619 stop_activity(dev, dev->driver);
1620 stat = 0;
1621 handled = 1;
1622 // FIXME have a neater way to prevent re-enumeration
1623 dev->driver = NULL;
1624 goto done;
1625 }
1626 if (stat & INT_PWRDETECT) {
1627 writel(~stat, &regs->int_status);
1628 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1629 VDBG(dev, "connect\n");
1630 ep0_start(dev);
1631 } else {
1632 DBG(dev, "disconnect\n");
1633 if (dev->gadget.speed == USB_SPEED_FULL)
1634 stop_activity(dev, dev->driver);
1635 dev->ep0state = EP0_DISCONNECT;
1636 dev->int_enable = INT_DEVWIDE;
1637 writel(dev->int_enable, &dev->regs->int_enable);
1638 }
1639 stat = 0;
1640 handled = 1;
1641 goto done;
1642 }
1643 if (stat & INT_SUSPEND) {
1644 ACK(INT_SUSPEND);
1645 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1646 switch (dev->ep0state) {
1647 case EP0_DISCONNECT:
1648 case EP0_SUSPEND:
1649 goto pm_next;
1650 default:
1651 break;
1652 }
1653 DBG(dev, "USB suspend\n");
1654 dev->ep0state = EP0_SUSPEND;
1655 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1656 && dev->driver
1657 && dev->driver->suspend) {
1658 spin_unlock(&dev->lock);
1659 dev->driver->suspend(&dev->gadget);
1660 spin_lock(&dev->lock);
1661 }
1662 } else {
1663 if (dev->ep0state != EP0_SUSPEND) {
1664 DBG(dev, "bogus USB resume %d\n",
1665 dev->ep0state);
1666 goto pm_next;
1667 }
1668 DBG(dev, "USB resume\n");
1669 dev->ep0state = EP0_IDLE;
1670 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1671 && dev->driver
1672 && dev->driver->resume) {
1673 spin_unlock(&dev->lock);
1674 dev->driver->resume(&dev->gadget);
1675 spin_lock(&dev->lock);
1676 }
1677 }
1678 }
1679 pm_next:
1680 if (stat & INT_USBRESET) { /* hub reset done */
1681 ACK(INT_USBRESET);
1682 INFO(dev, "USB reset done, gadget %s\n",
1683 dev->driver->driver.name);
1684 }
1685 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1686 }
1687
1688 /* progress ep0 setup, data, or status stages.
1689 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1690 */
1691 if (stat & INT_SETUP) {
1692 ACK(INT_SETUP);
1693 dev->ep[0].irqs++;
1694 ep0_setup(dev);
1695 }
1696 if (stat & INT_STATUSNAK) {
1697 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1698 if (dev->ep0state == EP0_IN) {
1699 ep = &dev->ep[0];
1700 ep->irqs++;
1701 nuke(ep, 0);
1702 writel(~(1<<0), &regs->EOP);
1703 dev->ep0state = EP0_STATUS;
1704 }
1705 }
1706 if (stat & INT_ENDPOINT0) {
1707 ACK(INT_ENDPOINT0);
1708 ep = &dev->ep[0];
1709 ep->irqs++;
1710 pio_advance(ep);
1711 }
1712
1713 /* dma completion */
1714 if (stat & INT_MSTRDEND) { /* IN */
1715 ACK(INT_MSTRDEND);
1716 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1717 ep->irqs++;
1718 dma_advance(dev, ep);
1719 }
1720 if (stat & INT_MSTWREND) { /* OUT */
1721 ACK(INT_MSTWREND);
1722 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1723 ep->irqs++;
1724 dma_advance(dev, ep);
1725 }
1726 if (stat & INT_MSTWRTMOUT) { /* OUT */
1727 ACK(INT_MSTWRTMOUT);
1728 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1729 ep->irqs++;
1730 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1731 // reset dma? then dma_advance()
1732 }
1733
1734 /* pio */
1735 for (i = 1; i < 4; i++) {
1736 u32 tmp = INT_EPxDATASET(i);
1737
1738 if (!(stat & tmp))
1739 continue;
1740 ep = &dev->ep[i];
1741 pio_advance(ep);
1742 if (list_empty (&ep->queue))
1743 pio_irq_disable(dev, regs, i);
1744 stat &= ~tmp;
1745 handled = 1;
1746 ep->irqs++;
1747 }
1748
1749 if (rescans--)
1750 goto rescan;
1751
1752 done:
1753 (void)readl(&regs->int_enable);
1754 spin_unlock(&dev->lock);
1755 if (stat)
1756 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1757 readl(&regs->int_status), dev->int_enable);
1758 return IRQ_RETVAL(handled);
1759 }
1760
1761 #undef ACK
1762
1763 /*-------------------------------------------------------------------------*/
1764
1765 static void gadget_release(struct device *_dev)
1766 {
1767 struct goku_udc *dev = dev_get_drvdata(_dev);
1768
1769 kfree(dev);
1770 }
1771
1772 /* tear down the binding between this driver and the pci device */
1773
1774 static void goku_remove(struct pci_dev *pdev)
1775 {
1776 struct goku_udc *dev = pci_get_drvdata(pdev);
1777
1778 DBG(dev, "%s\n", __FUNCTION__);
1779
1780 BUG_ON(dev->driver);
1781
1782 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1783 remove_proc_entry(proc_node_name, NULL);
1784 #endif
1785 if (dev->regs)
1786 udc_reset(dev);
1787 if (dev->got_irq)
1788 free_irq(pdev->irq, dev);
1789 if (dev->regs)
1790 iounmap(dev->regs);
1791 if (dev->got_region)
1792 release_mem_region(pci_resource_start (pdev, 0),
1793 pci_resource_len (pdev, 0));
1794 if (dev->enabled)
1795 pci_disable_device(pdev);
1796 device_unregister(&dev->gadget.dev);
1797
1798 pci_set_drvdata(pdev, NULL);
1799 dev->regs = NULL;
1800 the_controller = NULL;
1801
1802 INFO(dev, "unbind\n");
1803 }
1804
1805 /* wrap this driver around the specified pci device, but
1806 * don't respond over USB until a gadget driver binds to us.
1807 */
1808
1809 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1810 {
1811 struct goku_udc *dev = NULL;
1812 unsigned long resource, len;
1813 void __iomem *base = NULL;
1814 int retval;
1815
1816 /* if you want to support more than one controller in a system,
1817 * usb_gadget_driver_{register,unregister}() must change.
1818 */
1819 if (the_controller) {
1820 WARN(dev, "ignoring %s\n", pci_name(pdev));
1821 return -EBUSY;
1822 }
1823 if (!pdev->irq) {
1824 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1825 retval = -ENODEV;
1826 goto done;
1827 }
1828
1829 /* alloc, and start init */
1830 dev = kmalloc (sizeof *dev, GFP_KERNEL);
1831 if (dev == NULL){
1832 pr_debug("enomem %s\n", pci_name(pdev));
1833 retval = -ENOMEM;
1834 goto done;
1835 }
1836
1837 memset(dev, 0, sizeof *dev);
1838 spin_lock_init(&dev->lock);
1839 dev->pdev = pdev;
1840 dev->gadget.ops = &goku_ops;
1841
1842 /* the "gadget" abstracts/virtualizes the controller */
1843 strcpy(dev->gadget.dev.bus_id, "gadget");
1844 dev->gadget.dev.parent = &pdev->dev;
1845 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1846 dev->gadget.dev.release = gadget_release;
1847 dev->gadget.name = driver_name;
1848
1849 /* now all the pci goodies ... */
1850 retval = pci_enable_device(pdev);
1851 if (retval < 0) {
1852 DBG(dev, "can't enable, %d\n", retval);
1853 goto done;
1854 }
1855 dev->enabled = 1;
1856
1857 resource = pci_resource_start(pdev, 0);
1858 len = pci_resource_len(pdev, 0);
1859 if (!request_mem_region(resource, len, driver_name)) {
1860 DBG(dev, "controller already in use\n");
1861 retval = -EBUSY;
1862 goto done;
1863 }
1864 dev->got_region = 1;
1865
1866 base = ioremap_nocache(resource, len);
1867 if (base == NULL) {
1868 DBG(dev, "can't map memory\n");
1869 retval = -EFAULT;
1870 goto done;
1871 }
1872 dev->regs = (struct goku_udc_regs __iomem *) base;
1873
1874 pci_set_drvdata(pdev, dev);
1875 INFO(dev, "%s\n", driver_desc);
1876 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1877 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1878
1879 /* init to known state, then setup irqs */
1880 udc_reset(dev);
1881 udc_reinit (dev);
1882 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1883 driver_name, dev) != 0) {
1884 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1885 retval = -EBUSY;
1886 goto done;
1887 }
1888 dev->got_irq = 1;
1889 if (use_dma)
1890 pci_set_master(pdev);
1891
1892
1893 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1894 create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1895 #endif
1896
1897 /* done */
1898 the_controller = dev;
1899 device_register(&dev->gadget.dev);
1900
1901 return 0;
1902
1903 done:
1904 if (dev)
1905 goku_remove (pdev);
1906 return retval;
1907 }
1908
1909
1910 /*-------------------------------------------------------------------------*/
1911
1912 static struct pci_device_id pci_ids [] = { {
1913 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1914 .class_mask = ~0,
1915 .vendor = 0x102f, /* Toshiba */
1916 .device = 0x0107, /* this UDC */
1917 .subvendor = PCI_ANY_ID,
1918 .subdevice = PCI_ANY_ID,
1919
1920 }, { /* end: all zeroes */ }
1921 };
1922 MODULE_DEVICE_TABLE (pci, pci_ids);
1923
1924 static struct pci_driver goku_pci_driver = {
1925 .name = (char *) driver_name,
1926 .id_table = pci_ids,
1927
1928 .probe = goku_probe,
1929 .remove = goku_remove,
1930
1931 /* FIXME add power management support */
1932 };
1933
1934 static int __init init (void)
1935 {
1936 return pci_register_driver (&goku_pci_driver);
1937 }
1938 module_init (init);
1939
1940 static void __exit cleanup (void)
1941 {
1942 pci_unregister_driver (&goku_pci_driver);
1943 }
1944 module_exit (cleanup);
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