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usb: gadgetfs remove delayed init mode
[linux-2.6.git] / drivers / usb / gadget / goku_udc.c
blobe873cf4882462fe7aed7e50571cad7fe561e0414
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/sched.h>
33 #include <linux/slab.h>
34 #include <linux/smp_lock.h>
35 #include <linux/errno.h>
36 #include <linux/init.h>
37 #include <linux/timer.h>
38 #include <linux/list.h>
39 #include <linux/interrupt.h>
40 #include <linux/proc_fs.h>
41 #include <linux/device.h>
42 #include <linux/usb/ch9.h>
43 #include <linux/usb_gadget.h>
44
45 #include <asm/byteorder.h>
46 #include <asm/io.h>
47 #include <asm/irq.h>
48 #include <asm/system.h>
49 #include <asm/unaligned.h>
50
51
52 #include "goku_udc.h"
53
54 #define DRIVER_DESC "TC86C001 USB Device Controller"
55 #define DRIVER_VERSION "30-Oct 2003"
56
57 #define DMA_ADDR_INVALID (~(dma_addr_t)0)
58
59 static const char driver_name [] = "goku_udc";
60 static const char driver_desc [] = DRIVER_DESC;
61
62 MODULE_AUTHOR("source@mvista.com");
63 MODULE_DESCRIPTION(DRIVER_DESC);
64 MODULE_LICENSE("GPL");
65
66
67 /*
68 * IN dma behaves ok under testing, though the IN-dma abort paths don't
69 * seem to behave quite as expected. Used by default.
70 *
71 * OUT dma documents design problems handling the common "short packet"
72 * transfer termination policy; it couldn't be enabled by default, even
73 * if the OUT-dma abort problems had a resolution.
74 */
75 static unsigned use_dma = 1;
76
77 #if 0
78 //#include <linux/moduleparam.h>
79 /* "modprobe goku_udc use_dma=1" etc
80 * 0 to disable dma
81 * 1 to use IN dma only (normal operation)
82 * 2 to use IN and OUT dma
83 */
84 module_param(use_dma, uint, S_IRUGO);
85 #endif
86
87 /*-------------------------------------------------------------------------*/
88
89 static void nuke(struct goku_ep *, int status);
90
91 static inline void
92 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
93 {
94 writel(COMMAND_EP(epnum) | command, &regs->Command);
95 udelay(300);
96 }
97
98 static int
99 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
100 {
101 struct goku_udc *dev;
102 struct goku_ep *ep;
103 u32 mode;
104 u16 max;
105 unsigned long flags;
106
107 ep = container_of(_ep, struct goku_ep, ep);
108 if (!_ep || !desc || ep->desc
109 || desc->bDescriptorType != USB_DT_ENDPOINT)
110 return -EINVAL;
111 dev = ep->dev;
112 if (ep == &dev->ep[0])
113 return -EINVAL;
114 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
115 return -ESHUTDOWN;
116 if (ep->num != (desc->bEndpointAddress & 0x0f))
117 return -EINVAL;
118
119 switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
120 case USB_ENDPOINT_XFER_BULK:
121 case USB_ENDPOINT_XFER_INT:
122 break;
123 default:
124 return -EINVAL;
125 }
126
127 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
128 != EPxSTATUS_EP_INVALID)
129 return -EBUSY;
130
131 /* enabling the no-toggle interrupt mode would need an api hook */
132 mode = 0;
133 max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
134 switch (max) {
135 case 64: mode++;
136 case 32: mode++;
137 case 16: mode++;
138 case 8: mode <<= 3;
139 break;
140 default:
141 return -EINVAL;
142 }
143 mode |= 2 << 1; /* bulk, or intr-with-toggle */
144
145 /* ep1/ep2 dma direction is chosen early; it works in the other
146 * direction, with pio. be cautious with out-dma.
147 */
148 ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
149 if (ep->is_in) {
150 mode |= 1;
151 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
152 } else {
153 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
154 if (ep->dma)
155 DBG(dev, "%s out-dma hides short packets\n",
156 ep->ep.name);
157 }
158
159 spin_lock_irqsave(&ep->dev->lock, flags);
160
161 /* ep1 and ep2 can do double buffering and/or dma */
162 if (ep->num < 3) {
163 struct goku_udc_regs __iomem *regs = ep->dev->regs;
164 u32 tmp;
165
166 /* double buffer except (for now) with pio in */
167 tmp = ((ep->dma || !ep->is_in)
168 ? 0x10 /* double buffered */
169 : 0x11 /* single buffer */
170 ) << ep->num;
171 tmp |= readl(&regs->EPxSingle);
172 writel(tmp, &regs->EPxSingle);
173
174 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
175 tmp |= readl(&regs->EPxBCS);
176 writel(tmp, &regs->EPxBCS);
177 }
178 writel(mode, ep->reg_mode);
179 command(ep->dev->regs, COMMAND_RESET, ep->num);
180 ep->ep.maxpacket = max;
181 ep->stopped = 0;
182 ep->desc = desc;
183 spin_unlock_irqrestore(&ep->dev->lock, flags);
184
185 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
186 ep->is_in ? "IN" : "OUT",
187 ep->dma ? "dma" : "pio",
188 max);
189
190 return 0;
191 }
192
193 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
194 {
195 struct goku_udc *dev = ep->dev;
196
197 if (regs) {
198 command(regs, COMMAND_INVALID, ep->num);
199 if (ep->num) {
200 if (ep->num == UDC_MSTWR_ENDPOINT)
201 dev->int_enable &= ~(INT_MSTWREND
202 |INT_MSTWRTMOUT);
203 else if (ep->num == UDC_MSTRD_ENDPOINT)
204 dev->int_enable &= ~INT_MSTRDEND;
205 dev->int_enable &= ~INT_EPxDATASET (ep->num);
206 } else
207 dev->int_enable &= ~INT_EP0;
208 writel(dev->int_enable, &regs->int_enable);
209 readl(&regs->int_enable);
210 if (ep->num < 3) {
211 struct goku_udc_regs __iomem *r = ep->dev->regs;
212 u32 tmp;
213
214 tmp = readl(&r->EPxSingle);
215 tmp &= ~(0x11 << ep->num);
216 writel(tmp, &r->EPxSingle);
217
218 tmp = readl(&r->EPxBCS);
219 tmp &= ~(0x11 << ep->num);
220 writel(tmp, &r->EPxBCS);
221 }
222 /* reset dma in case we're still using it */
223 if (ep->dma) {
224 u32 master;
225
226 master = readl(&regs->dma_master) & MST_RW_BITS;
227 if (ep->num == UDC_MSTWR_ENDPOINT) {
228 master &= ~MST_W_BITS;
229 master |= MST_WR_RESET;
230 } else {
231 master &= ~MST_R_BITS;
232 master |= MST_RD_RESET;
233 }
234 writel(master, &regs->dma_master);
235 }
236 }
237
238 ep->ep.maxpacket = MAX_FIFO_SIZE;
239 ep->desc = NULL;
240 ep->stopped = 1;
241 ep->irqs = 0;
242 ep->dma = 0;
243 }
244
245 static int goku_ep_disable(struct usb_ep *_ep)
246 {
247 struct goku_ep *ep;
248 struct goku_udc *dev;
249 unsigned long flags;
250
251 ep = container_of(_ep, struct goku_ep, ep);
252 if (!_ep || !ep->desc)
253 return -ENODEV;
254 dev = ep->dev;
255 if (dev->ep0state == EP0_SUSPEND)
256 return -EBUSY;
257
258 VDBG(dev, "disable %s\n", _ep->name);
259
260 spin_lock_irqsave(&dev->lock, flags);
261 nuke(ep, -ESHUTDOWN);
262 ep_reset(dev->regs, ep);
263 spin_unlock_irqrestore(&dev->lock, flags);
264
265 return 0;
266 }
267
268 /*-------------------------------------------------------------------------*/
269
270 static struct usb_request *
271 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
272 {
273 struct goku_request *req;
274
275 if (!_ep)
276 return NULL;
277 req = kzalloc(sizeof *req, gfp_flags);
278 if (!req)
279 return NULL;
280
281 req->req.dma = DMA_ADDR_INVALID;
282 INIT_LIST_HEAD(&req->queue);
283 return &req->req;
284 }
285
286 static void
287 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
288 {
289 struct goku_request *req;
290
291 if (!_ep || !_req)
292 return;
293
294 req = container_of(_req, struct goku_request, req);
295 WARN_ON(!list_empty(&req->queue));
296 kfree(req);
297 }
298
299 /*-------------------------------------------------------------------------*/
300
301 #undef USE_KMALLOC
302
303 /* many common platforms have dma-coherent caches, which means that it's
304 * safe to use kmalloc() memory for all i/o buffers without using any
305 * cache flushing calls. (unless you're trying to share cache lines
306 * between dma and non-dma activities, which is a slow idea in any case.)
307 *
308 * other platforms need more care, with 2.6 having a moderately general
309 * solution except for the common "buffer is smaller than a page" case.
310 */
311 #if defined(CONFIG_X86)
312 #define USE_KMALLOC
313
314 #elif defined(CONFIG_MIPS) && !defined(CONFIG_DMA_NONCOHERENT)
315 #define USE_KMALLOC
316
317 #elif defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
318 #define USE_KMALLOC
319
320 #endif
321
322 /* allocating buffers this way eliminates dma mapping overhead, which
323 * on some platforms will mean eliminating a per-io buffer copy. with
324 * some kinds of system caches, further tweaks may still be needed.
325 */
326 static void *
327 goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
328 dma_addr_t *dma, gfp_t gfp_flags)
329 {
330 void *retval;
331 struct goku_ep *ep;
332
333 ep = container_of(_ep, struct goku_ep, ep);
334 if (!_ep)
335 return NULL;
336 *dma = DMA_ADDR_INVALID;
337
338 #if defined(USE_KMALLOC)
339 retval = kmalloc(bytes, gfp_flags);
340 if (retval)
341 *dma = virt_to_phys(retval);
342 #else
343 if (ep->dma) {
344 /* the main problem with this call is that it wastes memory
345 * on typical 1/N page allocations: it allocates 1-N pages.
346 */
347 #warning Using dma_alloc_coherent even with buffers smaller than a page.
348 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
349 bytes, dma, gfp_flags);
350 } else
351 retval = kmalloc(bytes, gfp_flags);
352 #endif
353 return retval;
354 }
355
356 static void
357 goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
358 {
359 /* free memory into the right allocator */
360 #ifndef USE_KMALLOC
361 if (dma != DMA_ADDR_INVALID) {
362 struct goku_ep *ep;
363
364 ep = container_of(_ep, struct goku_ep, ep);
365 if (!_ep)
366 return;
367 dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
368 } else
369 #endif
370 kfree (buf);
371 }
372
373 /*-------------------------------------------------------------------------*/
374
375 static void
376 done(struct goku_ep *ep, struct goku_request *req, int status)
377 {
378 struct goku_udc *dev;
379 unsigned stopped = ep->stopped;
380
381 list_del_init(&req->queue);
382
383 if (likely(req->req.status == -EINPROGRESS))
384 req->req.status = status;
385 else
386 status = req->req.status;
387
388 dev = ep->dev;
389 if (req->mapped) {
390 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
391 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
392 req->req.dma = DMA_ADDR_INVALID;
393 req->mapped = 0;
394 }
395
396 #ifndef USB_TRACE
397 if (status && status != -ESHUTDOWN)
398 #endif
399 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
400 ep->ep.name, &req->req, status,
401 req->req.actual, req->req.length);
402
403 /* don't modify queue heads during completion callback */
404 ep->stopped = 1;
405 spin_unlock(&dev->lock);
406 req->req.complete(&ep->ep, &req->req);
407 spin_lock(&dev->lock);
408 ep->stopped = stopped;
409 }
410
411 /*-------------------------------------------------------------------------*/
412
413 static inline int
414 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
415 {
416 unsigned length, count;
417
418 length = min(req->req.length - req->req.actual, max);
419 req->req.actual += length;
420
421 count = length;
422 while (likely(count--))
423 writel(*buf++, fifo);
424 return length;
425 }
426
427 // return: 0 = still running, 1 = completed, negative = errno
428 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
429 {
430 struct goku_udc *dev = ep->dev;
431 u32 tmp;
432 u8 *buf;
433 unsigned count;
434 int is_last;
435
436 tmp = readl(&dev->regs->DataSet);
437 buf = req->req.buf + req->req.actual;
438 prefetch(buf);
439
440 dev = ep->dev;
441 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
442 return -EL2HLT;
443
444 /* NOTE: just single-buffered PIO-IN for now. */
445 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
446 return 0;
447
448 /* clear our "packet available" irq */
449 if (ep->num != 0)
450 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
451
452 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
453
454 /* last packet often short (sometimes a zlp, especially on ep0) */
455 if (unlikely(count != ep->ep.maxpacket)) {
456 writel(~(1<<ep->num), &dev->regs->EOP);
457 if (ep->num == 0) {
458 dev->ep[0].stopped = 1;
459 dev->ep0state = EP0_STATUS;
460 }
461 is_last = 1;
462 } else {
463 if (likely(req->req.length != req->req.actual)
464 || req->req.zero)
465 is_last = 0;
466 else
467 is_last = 1;
468 }
469 #if 0 /* printk seemed to trash is_last...*/
470 //#ifdef USB_TRACE
471 VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
472 ep->ep.name, count, is_last ? "/last" : "",
473 req->req.length - req->req.actual, req);
474 #endif
475
476 /* requests complete when all IN data is in the FIFO,
477 * or sometimes later, if a zlp was needed.
478 */
479 if (is_last) {
480 done(ep, req, 0);
481 return 1;
482 }
483
484 return 0;
485 }
486
487 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
488 {
489 struct goku_udc_regs __iomem *regs;
490 u32 size, set;
491 u8 *buf;
492 unsigned bufferspace, is_short, dbuff;
493
494 regs = ep->dev->regs;
495 top:
496 buf = req->req.buf + req->req.actual;
497 prefetchw(buf);
498
499 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
500 return -EL2HLT;
501
502 dbuff = (ep->num == 1 || ep->num == 2);
503 do {
504 /* ack dataset irq matching the status we'll handle */
505 if (ep->num != 0)
506 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
507
508 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
509 size = readl(&regs->EPxSizeLA[ep->num]);
510 bufferspace = req->req.length - req->req.actual;
511
512 /* usually do nothing without an OUT packet */
513 if (likely(ep->num != 0 || bufferspace != 0)) {
514 if (unlikely(set == 0))
515 break;
516 /* use ep1/ep2 double-buffering for OUT */
517 if (!(size & PACKET_ACTIVE))
518 size = readl(&regs->EPxSizeLB[ep->num]);
519 if (!(size & PACKET_ACTIVE)) // "can't happen"
520 break;
521 size &= DATASIZE; /* EPxSizeH == 0 */
522
523 /* ep0out no-out-data case for set_config, etc */
524 } else
525 size = 0;
526
527 /* read all bytes from this packet */
528 req->req.actual += size;
529 is_short = (size < ep->ep.maxpacket);
530 #ifdef USB_TRACE
531 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
532 ep->ep.name, size, is_short ? "/S" : "",
533 req, req->req.actual, req->req.length);
534 #endif
535 while (likely(size-- != 0)) {
536 u8 byte = (u8) readl(ep->reg_fifo);
537
538 if (unlikely(bufferspace == 0)) {
539 /* this happens when the driver's buffer
540 * is smaller than what the host sent.
541 * discard the extra data in this packet.
542 */
543 if (req->req.status != -EOVERFLOW)
544 DBG(ep->dev, "%s overflow %u\n",
545 ep->ep.name, size);
546 req->req.status = -EOVERFLOW;
547 } else {
548 *buf++ = byte;
549 bufferspace--;
550 }
551 }
552
553 /* completion */
554 if (unlikely(is_short || req->req.actual == req->req.length)) {
555 if (unlikely(ep->num == 0)) {
556 /* non-control endpoints now usable? */
557 if (ep->dev->req_config)
558 writel(ep->dev->configured
559 ? USBSTATE_CONFIGURED
560 : 0,
561 &regs->UsbState);
562 /* ep0out status stage */
563 writel(~(1<<0), &regs->EOP);
564 ep->stopped = 1;
565 ep->dev->ep0state = EP0_STATUS;
566 }
567 done(ep, req, 0);
568
569 /* empty the second buffer asap */
570 if (dbuff && !list_empty(&ep->queue)) {
571 req = list_entry(ep->queue.next,
572 struct goku_request, queue);
573 goto top;
574 }
575 return 1;
576 }
577 } while (dbuff);
578 return 0;
579 }
580
581 static inline void
582 pio_irq_enable(struct goku_udc *dev,
583 struct goku_udc_regs __iomem *regs, int epnum)
584 {
585 dev->int_enable |= INT_EPxDATASET (epnum);
586 writel(dev->int_enable, &regs->int_enable);
587 /* write may still be posted */
588 }
589
590 static inline void
591 pio_irq_disable(struct goku_udc *dev,
592 struct goku_udc_regs __iomem *regs, int epnum)
593 {
594 dev->int_enable &= ~INT_EPxDATASET (epnum);
595 writel(dev->int_enable, &regs->int_enable);
596 /* write may still be posted */
597 }
598
599 static inline void
600 pio_advance(struct goku_ep *ep)
601 {
602 struct goku_request *req;
603
604 if (unlikely(list_empty (&ep->queue)))
605 return;
606 req = list_entry(ep->queue.next, struct goku_request, queue);
607 (ep->is_in ? write_fifo : read_fifo)(ep, req);
608 }
609
610
611 /*-------------------------------------------------------------------------*/
612
613 // return: 0 = q running, 1 = q stopped, negative = errno
614 static int start_dma(struct goku_ep *ep, struct goku_request *req)
615 {
616 struct goku_udc_regs __iomem *regs = ep->dev->regs;
617 u32 master;
618 u32 start = req->req.dma;
619 u32 end = start + req->req.length - 1;
620
621 master = readl(&regs->dma_master) & MST_RW_BITS;
622
623 /* re-init the bits affecting IN dma; careful with zlps */
624 if (likely(ep->is_in)) {
625 if (unlikely(master & MST_RD_ENA)) {
626 DBG (ep->dev, "start, IN active dma %03x!!\n",
627 master);
628 // return -EL2HLT;
629 }
630 writel(end, &regs->in_dma_end);
631 writel(start, &regs->in_dma_start);
632
633 master &= ~MST_R_BITS;
634 if (unlikely(req->req.length == 0))
635 master = MST_RD_ENA | MST_RD_EOPB;
636 else if ((req->req.length % ep->ep.maxpacket) != 0
637 || req->req.zero)
638 master = MST_RD_ENA | MST_EOPB_ENA;
639 else
640 master = MST_RD_ENA | MST_EOPB_DIS;
641
642 ep->dev->int_enable |= INT_MSTRDEND;
643
644 /* Goku DMA-OUT merges short packets, which plays poorly with
645 * protocols where short packets mark the transfer boundaries.
646 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
647 * ending transfers after 3 SOFs; we don't turn it on.
648 */
649 } else {
650 if (unlikely(master & MST_WR_ENA)) {
651 DBG (ep->dev, "start, OUT active dma %03x!!\n",
652 master);
653 // return -EL2HLT;
654 }
655 writel(end, &regs->out_dma_end);
656 writel(start, &regs->out_dma_start);
657
658 master &= ~MST_W_BITS;
659 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
660
661 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
662 }
663
664 writel(master, &regs->dma_master);
665 writel(ep->dev->int_enable, &regs->int_enable);
666 return 0;
667 }
668
669 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
670 {
671 struct goku_request *req;
672 struct goku_udc_regs __iomem *regs = ep->dev->regs;
673 u32 master;
674
675 master = readl(&regs->dma_master);
676
677 if (unlikely(list_empty(&ep->queue))) {
678 stop:
679 if (ep->is_in)
680 dev->int_enable &= ~INT_MSTRDEND;
681 else
682 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
683 writel(dev->int_enable, &regs->int_enable);
684 return;
685 }
686 req = list_entry(ep->queue.next, struct goku_request, queue);
687
688 /* normal hw dma completion (not abort) */
689 if (likely(ep->is_in)) {
690 if (unlikely(master & MST_RD_ENA))
691 return;
692 req->req.actual = readl(&regs->in_dma_current);
693 } else {
694 if (unlikely(master & MST_WR_ENA))
695 return;
696
697 /* hardware merges short packets, and also hides packet
698 * overruns. a partial packet MAY be in the fifo here.
699 */
700 req->req.actual = readl(&regs->out_dma_current);
701 }
702 req->req.actual -= req->req.dma;
703 req->req.actual++;
704
705 #ifdef USB_TRACE
706 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
707 ep->ep.name, ep->is_in ? "IN" : "OUT",
708 req->req.actual, req->req.length, req);
709 #endif
710 done(ep, req, 0);
711 if (list_empty(&ep->queue))
712 goto stop;
713 req = list_entry(ep->queue.next, struct goku_request, queue);
714 (void) start_dma(ep, req);
715 }
716
717 static void abort_dma(struct goku_ep *ep, int status)
718 {
719 struct goku_udc_regs __iomem *regs = ep->dev->regs;
720 struct goku_request *req;
721 u32 curr, master;
722
723 /* NAK future host requests, hoping the implicit delay lets the
724 * dma engine finish reading (or writing) its latest packet and
725 * empty the dma buffer (up to 16 bytes).
726 *
727 * This avoids needing to clean up a partial packet in the fifo;
728 * we can't do that for IN without side effects to HALT and TOGGLE.
729 */
730 command(regs, COMMAND_FIFO_DISABLE, ep->num);
731 req = list_entry(ep->queue.next, struct goku_request, queue);
732 master = readl(&regs->dma_master) & MST_RW_BITS;
733
734 /* FIXME using these resets isn't usably documented. this may
735 * not work unless it's followed by disabling the endpoint.
736 *
737 * FIXME the OUT reset path doesn't even behave consistently.
738 */
739 if (ep->is_in) {
740 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
741 goto finished;
742 curr = readl(&regs->in_dma_current);
743
744 writel(curr, &regs->in_dma_end);
745 writel(curr, &regs->in_dma_start);
746
747 master &= ~MST_R_BITS;
748 master |= MST_RD_RESET;
749 writel(master, &regs->dma_master);
750
751 if (readl(&regs->dma_master) & MST_RD_ENA)
752 DBG(ep->dev, "IN dma active after reset!\n");
753
754 } else {
755 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
756 goto finished;
757 curr = readl(&regs->out_dma_current);
758
759 writel(curr, &regs->out_dma_end);
760 writel(curr, &regs->out_dma_start);
761
762 master &= ~MST_W_BITS;
763 master |= MST_WR_RESET;
764 writel(master, &regs->dma_master);
765
766 if (readl(&regs->dma_master) & MST_WR_ENA)
767 DBG(ep->dev, "OUT dma active after reset!\n");
768 }
769 req->req.actual = (curr - req->req.dma) + 1;
770 req->req.status = status;
771
772 VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
773 ep->is_in ? "IN" : "OUT",
774 req->req.actual, req->req.length);
775
776 command(regs, COMMAND_FIFO_ENABLE, ep->num);
777
778 return;
779
780 finished:
781 /* dma already completed; no abort needed */
782 command(regs, COMMAND_FIFO_ENABLE, ep->num);
783 req->req.actual = req->req.length;
784 req->req.status = 0;
785 }
786
787 /*-------------------------------------------------------------------------*/
788
789 static int
790 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
791 {
792 struct goku_request *req;
793 struct goku_ep *ep;
794 struct goku_udc *dev;
795 unsigned long flags;
796 int status;
797
798 /* always require a cpu-view buffer so pio works */
799 req = container_of(_req, struct goku_request, req);
800 if (unlikely(!_req || !_req->complete
801 || !_req->buf || !list_empty(&req->queue)))
802 return -EINVAL;
803 ep = container_of(_ep, struct goku_ep, ep);
804 if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
805 return -EINVAL;
806 dev = ep->dev;
807 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
808 return -ESHUTDOWN;
809
810 /* can't touch registers when suspended */
811 if (dev->ep0state == EP0_SUSPEND)
812 return -EBUSY;
813
814 /* set up dma mapping in case the caller didn't */
815 if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
816 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
817 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
818 req->mapped = 1;
819 }
820
821 #ifdef USB_TRACE
822 VDBG(dev, "%s queue req %p, len %u buf %p\n",
823 _ep->name, _req, _req->length, _req->buf);
824 #endif
825
826 spin_lock_irqsave(&dev->lock, flags);
827
828 _req->status = -EINPROGRESS;
829 _req->actual = 0;
830
831 /* for ep0 IN without premature status, zlp is required and
832 * writing EOP starts the status stage (OUT).
833 */
834 if (unlikely(ep->num == 0 && ep->is_in))
835 _req->zero = 1;
836
837 /* kickstart this i/o queue? */
838 status = 0;
839 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
840 /* dma: done after dma completion IRQ (or error)
841 * pio: done after last fifo operation
842 */
843 if (ep->dma)
844 status = start_dma(ep, req);
845 else
846 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
847
848 if (unlikely(status != 0)) {
849 if (status > 0)
850 status = 0;
851 req = NULL;
852 }
853
854 } /* else pio or dma irq handler advances the queue. */
855
856 if (likely(req != 0))
857 list_add_tail(&req->queue, &ep->queue);
858
859 if (likely(!list_empty(&ep->queue))
860 && likely(ep->num != 0)
861 && !ep->dma
862 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
863 pio_irq_enable(dev, dev->regs, ep->num);
864
865 spin_unlock_irqrestore(&dev->lock, flags);
866
867 /* pci writes may still be posted */
868 return status;
869 }
870
871 /* dequeue ALL requests */
872 static void nuke(struct goku_ep *ep, int status)
873 {
874 struct goku_request *req;
875
876 ep->stopped = 1;
877 if (list_empty(&ep->queue))
878 return;
879 if (ep->dma)
880 abort_dma(ep, status);
881 while (!list_empty(&ep->queue)) {
882 req = list_entry(ep->queue.next, struct goku_request, queue);
883 done(ep, req, status);
884 }
885 }
886
887 /* dequeue JUST ONE request */
888 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
889 {
890 struct goku_request *req;
891 struct goku_ep *ep;
892 struct goku_udc *dev;
893 unsigned long flags;
894
895 ep = container_of(_ep, struct goku_ep, ep);
896 if (!_ep || !_req || (!ep->desc && ep->num != 0))
897 return -EINVAL;
898 dev = ep->dev;
899 if (!dev->driver)
900 return -ESHUTDOWN;
901
902 /* we can't touch (dma) registers when suspended */
903 if (dev->ep0state == EP0_SUSPEND)
904 return -EBUSY;
905
906 VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
907 ep->is_in ? "IN" : "OUT",
908 ep->dma ? "dma" : "pio",
909 _req);
910
911 spin_lock_irqsave(&dev->lock, flags);
912
913 /* make sure it's actually queued on this endpoint */
914 list_for_each_entry (req, &ep->queue, queue) {
915 if (&req->req == _req)
916 break;
917 }
918 if (&req->req != _req) {
919 spin_unlock_irqrestore (&dev->lock, flags);
920 return -EINVAL;
921 }
922
923 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
924 abort_dma(ep, -ECONNRESET);
925 done(ep, req, -ECONNRESET);
926 dma_advance(dev, ep);
927 } else if (!list_empty(&req->queue))
928 done(ep, req, -ECONNRESET);
929 else
930 req = NULL;
931 spin_unlock_irqrestore(&dev->lock, flags);
932
933 return req ? 0 : -EOPNOTSUPP;
934 }
935
936 /*-------------------------------------------------------------------------*/
937
938 static void goku_clear_halt(struct goku_ep *ep)
939 {
940 // assert (ep->num !=0)
941 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
942 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
943 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
944 if (ep->stopped) {
945 ep->stopped = 0;
946 if (ep->dma) {
947 struct goku_request *req;
948
949 if (list_empty(&ep->queue))
950 return;
951 req = list_entry(ep->queue.next, struct goku_request,
952 queue);
953 (void) start_dma(ep, req);
954 } else
955 pio_advance(ep);
956 }
957 }
958
959 static int goku_set_halt(struct usb_ep *_ep, int value)
960 {
961 struct goku_ep *ep;
962 unsigned long flags;
963 int retval = 0;
964
965 if (!_ep)
966 return -ENODEV;
967 ep = container_of (_ep, struct goku_ep, ep);
968
969 if (ep->num == 0) {
970 if (value) {
971 ep->dev->ep0state = EP0_STALL;
972 ep->dev->ep[0].stopped = 1;
973 } else
974 return -EINVAL;
975
976 /* don't change EPxSTATUS_EP_INVALID to READY */
977 } else if (!ep->desc) {
978 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
979 return -EINVAL;
980 }
981
982 spin_lock_irqsave(&ep->dev->lock, flags);
983 if (!list_empty(&ep->queue))
984 retval = -EAGAIN;
985 else if (ep->is_in && value
986 /* data in (either) packet buffer? */
987 && (readl(&ep->dev->regs->DataSet)
988 & DATASET_AB(ep->num)))
989 retval = -EAGAIN;
990 else if (!value)
991 goku_clear_halt(ep);
992 else {
993 ep->stopped = 1;
994 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
995 command(ep->dev->regs, COMMAND_STALL, ep->num);
996 readl(ep->reg_status);
997 }
998 spin_unlock_irqrestore(&ep->dev->lock, flags);
999 return retval;
1000 }
1001
1002 static int goku_fifo_status(struct usb_ep *_ep)
1003 {
1004 struct goku_ep *ep;
1005 struct goku_udc_regs __iomem *regs;
1006 u32 size;
1007
1008 if (!_ep)
1009 return -ENODEV;
1010 ep = container_of(_ep, struct goku_ep, ep);
1011
1012 /* size is only reported sanely for OUT */
1013 if (ep->is_in)
1014 return -EOPNOTSUPP;
1015
1016 /* ignores 16-byte dma buffer; SizeH == 0 */
1017 regs = ep->dev->regs;
1018 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
1019 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
1020 VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
1021 return size;
1022 }
1023
1024 static void goku_fifo_flush(struct usb_ep *_ep)
1025 {
1026 struct goku_ep *ep;
1027 struct goku_udc_regs __iomem *regs;
1028 u32 size;
1029
1030 if (!_ep)
1031 return;
1032 ep = container_of(_ep, struct goku_ep, ep);
1033 VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
1034
1035 /* don't change EPxSTATUS_EP_INVALID to READY */
1036 if (!ep->desc && ep->num != 0) {
1037 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
1038 return;
1039 }
1040
1041 regs = ep->dev->regs;
1042 size = readl(&regs->EPxSizeLA[ep->num]);
1043 size &= DATASIZE;
1044
1045 /* Non-desirable behavior: FIFO_CLEAR also clears the
1046 * endpoint halt feature. For OUT, we _could_ just read
1047 * the bytes out (PIO, if !ep->dma); for in, no choice.
1048 */
1049 if (size)
1050 command(regs, COMMAND_FIFO_CLEAR, ep->num);
1051 }
1052
1053 static struct usb_ep_ops goku_ep_ops = {
1054 .enable = goku_ep_enable,
1055 .disable = goku_ep_disable,
1056
1057 .alloc_request = goku_alloc_request,
1058 .free_request = goku_free_request,
1059
1060 .alloc_buffer = goku_alloc_buffer,
1061 .free_buffer = goku_free_buffer,
1062
1063 .queue = goku_queue,
1064 .dequeue = goku_dequeue,
1065
1066 .set_halt = goku_set_halt,
1067 .fifo_status = goku_fifo_status,
1068 .fifo_flush = goku_fifo_flush,
1069 };
1070
1071 /*-------------------------------------------------------------------------*/
1072
1073 static int goku_get_frame(struct usb_gadget *_gadget)
1074 {
1075 return -EOPNOTSUPP;
1076 }
1077
1078 static const struct usb_gadget_ops goku_ops = {
1079 .get_frame = goku_get_frame,
1080 // no remote wakeup
1081 // not selfpowered
1082 };
1083
1084 /*-------------------------------------------------------------------------*/
1085
1086 static inline char *dmastr(void)
1087 {
1088 if (use_dma == 0)
1089 return "(dma disabled)";
1090 else if (use_dma == 2)
1091 return "(dma IN and OUT)";
1092 else
1093 return "(dma IN)";
1094 }
1095
1096 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1097
1098 static const char proc_node_name [] = "driver/udc";
1099
1100 #define FOURBITS "%s%s%s%s"
1101 #define EIGHTBITS FOURBITS FOURBITS
1102
1103 static void
1104 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1105 {
1106 int t;
1107
1108 /* int_status is the same format ... */
1109 t = scnprintf(*next, *size,
1110 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1111 label, mask,
1112 (mask & INT_PWRDETECT) ? " power" : "",
1113 (mask & INT_SYSERROR) ? " sys" : "",
1114 (mask & INT_MSTRDEND) ? " in-dma" : "",
1115 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1116
1117 (mask & INT_MSTWREND) ? " out-dma" : "",
1118 (mask & INT_MSTWRSET) ? " wrset" : "",
1119 (mask & INT_ERR) ? " err" : "",
1120 (mask & INT_SOF) ? " sof" : "",
1121
1122 (mask & INT_EP3NAK) ? " ep3nak" : "",
1123 (mask & INT_EP2NAK) ? " ep2nak" : "",
1124 (mask & INT_EP1NAK) ? " ep1nak" : "",
1125 (mask & INT_EP3DATASET) ? " ep3" : "",
1126
1127 (mask & INT_EP2DATASET) ? " ep2" : "",
1128 (mask & INT_EP1DATASET) ? " ep1" : "",
1129 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1130 (mask & INT_STATUS) ? " ep0status" : "",
1131
1132 (mask & INT_SETUP) ? " setup" : "",
1133 (mask & INT_ENDPOINT0) ? " ep0" : "",
1134 (mask & INT_USBRESET) ? " reset" : "",
1135 (mask & INT_SUSPEND) ? " suspend" : "");
1136 *size -= t;
1137 *next += t;
1138 }
1139
1140
1141 static int
1142 udc_proc_read(char *buffer, char **start, off_t off, int count,
1143 int *eof, void *_dev)
1144 {
1145 char *buf = buffer;
1146 struct goku_udc *dev = _dev;
1147 struct goku_udc_regs __iomem *regs = dev->regs;
1148 char *next = buf;
1149 unsigned size = count;
1150 unsigned long flags;
1151 int i, t, is_usb_connected;
1152 u32 tmp;
1153
1154 if (off != 0)
1155 return 0;
1156
1157 local_irq_save(flags);
1158
1159 /* basic device status */
1160 tmp = readl(&regs->power_detect);
1161 is_usb_connected = tmp & PW_DETECT;
1162 t = scnprintf(next, size,
1163 "%s - %s\n"
1164 "%s version: %s %s\n"
1165 "Gadget driver: %s\n"
1166 "Host %s, %s\n"
1167 "\n",
1168 pci_name(dev->pdev), driver_desc,
1169 driver_name, DRIVER_VERSION, dmastr(),
1170 dev->driver ? dev->driver->driver.name : "(none)",
1171 is_usb_connected
1172 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1173 : "disconnected",
1174 ({char *tmp;
1175 switch(dev->ep0state){
1176 case EP0_DISCONNECT: tmp = "ep0_disconnect"; break;
1177 case EP0_IDLE: tmp = "ep0_idle"; break;
1178 case EP0_IN: tmp = "ep0_in"; break;
1179 case EP0_OUT: tmp = "ep0_out"; break;
1180 case EP0_STATUS: tmp = "ep0_status"; break;
1181 case EP0_STALL: tmp = "ep0_stall"; break;
1182 case EP0_SUSPEND: tmp = "ep0_suspend"; break;
1183 default: tmp = "ep0_?"; break;
1184 } tmp; })
1185 );
1186 size -= t;
1187 next += t;
1188
1189 dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1190 dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1191
1192 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1193 goto done;
1194
1195 /* registers for (active) device and ep0 */
1196 t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1197 "single.bcs %02x.%02x state %x addr %u\n",
1198 dev->irqs, readl(&regs->DataSet),
1199 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1200 readl(&regs->UsbState),
1201 readl(&regs->address));
1202 size -= t;
1203 next += t;
1204
1205 tmp = readl(&regs->dma_master);
1206 t = scnprintf(next, size,
1207 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1208 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1209 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1210 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1211 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1212
1213 (tmp & MST_RD_EOPB) ? " eopb" : "",
1214 (tmp & MST_RD_RESET) ? " in_reset" : "",
1215 (tmp & MST_WR_RESET) ? " out_reset" : "",
1216 (tmp & MST_RD_ENA) ? " IN" : "",
1217
1218 (tmp & MST_WR_ENA) ? " OUT" : "",
1219 (tmp & MST_CONNECTION)
1220 ? "ep1in/ep2out"
1221 : "ep1out/ep2in");
1222 size -= t;
1223 next += t;
1224
1225 /* dump endpoint queues */
1226 for (i = 0; i < 4; i++) {
1227 struct goku_ep *ep = &dev->ep [i];
1228 struct goku_request *req;
1229 int t;
1230
1231 if (i && !ep->desc)
1232 continue;
1233
1234 tmp = readl(ep->reg_status);
1235 t = scnprintf(next, size,
1236 "%s %s max %u %s, irqs %lu, "
1237 "status %02x (%s) " FOURBITS "\n",
1238 ep->ep.name,
1239 ep->is_in ? "in" : "out",
1240 ep->ep.maxpacket,
1241 ep->dma ? "dma" : "pio",
1242 ep->irqs,
1243 tmp, ({ char *s;
1244 switch (tmp & EPxSTATUS_EP_MASK) {
1245 case EPxSTATUS_EP_READY:
1246 s = "ready"; break;
1247 case EPxSTATUS_EP_DATAIN:
1248 s = "packet"; break;
1249 case EPxSTATUS_EP_FULL:
1250 s = "full"; break;
1251 case EPxSTATUS_EP_TX_ERR: // host will retry
1252 s = "tx_err"; break;
1253 case EPxSTATUS_EP_RX_ERR:
1254 s = "rx_err"; break;
1255 case EPxSTATUS_EP_BUSY: /* ep0 only */
1256 s = "busy"; break;
1257 case EPxSTATUS_EP_STALL:
1258 s = "stall"; break;
1259 case EPxSTATUS_EP_INVALID: // these "can't happen"
1260 s = "invalid"; break;
1261 default:
1262 s = "?"; break;
1263 }; s; }),
1264 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1265 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1266 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1267 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1268 );
1269 if (t <= 0 || t > size)
1270 goto done;
1271 size -= t;
1272 next += t;
1273
1274 if (list_empty(&ep->queue)) {
1275 t = scnprintf(next, size, "\t(nothing queued)\n");
1276 if (t <= 0 || t > size)
1277 goto done;
1278 size -= t;
1279 next += t;
1280 continue;
1281 }
1282 list_for_each_entry(req, &ep->queue, queue) {
1283 if (ep->dma && req->queue.prev == &ep->queue) {
1284 if (i == UDC_MSTRD_ENDPOINT)
1285 tmp = readl(&regs->in_dma_current);
1286 else
1287 tmp = readl(&regs->out_dma_current);
1288 tmp -= req->req.dma;
1289 tmp++;
1290 } else
1291 tmp = req->req.actual;
1292
1293 t = scnprintf(next, size,
1294 "\treq %p len %u/%u buf %p\n",
1295 &req->req, tmp, req->req.length,
1296 req->req.buf);
1297 if (t <= 0 || t > size)
1298 goto done;
1299 size -= t;
1300 next += t;
1301 }
1302 }
1303
1304 done:
1305 local_irq_restore(flags);
1306 *eof = 1;
1307 return count - size;
1308 }
1309
1310 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1311
1312 /*-------------------------------------------------------------------------*/
1313
1314 static void udc_reinit (struct goku_udc *dev)
1315 {
1316 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1317
1318 unsigned i;
1319
1320 INIT_LIST_HEAD (&dev->gadget.ep_list);
1321 dev->gadget.ep0 = &dev->ep [0].ep;
1322 dev->gadget.speed = USB_SPEED_UNKNOWN;
1323 dev->ep0state = EP0_DISCONNECT;
1324 dev->irqs = 0;
1325
1326 for (i = 0; i < 4; i++) {
1327 struct goku_ep *ep = &dev->ep[i];
1328
1329 ep->num = i;
1330 ep->ep.name = names[i];
1331 ep->reg_fifo = &dev->regs->ep_fifo [i];
1332 ep->reg_status = &dev->regs->ep_status [i];
1333 ep->reg_mode = &dev->regs->ep_mode[i];
1334
1335 ep->ep.ops = &goku_ep_ops;
1336 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1337 ep->dev = dev;
1338 INIT_LIST_HEAD (&ep->queue);
1339
1340 ep_reset(NULL, ep);
1341 }
1342
1343 dev->ep[0].reg_mode = NULL;
1344 dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1345 list_del_init (&dev->ep[0].ep.ep_list);
1346 }
1347
1348 static void udc_reset(struct goku_udc *dev)
1349 {
1350 struct goku_udc_regs __iomem *regs = dev->regs;
1351
1352 writel(0, &regs->power_detect);
1353 writel(0, &regs->int_enable);
1354 readl(&regs->int_enable);
1355 dev->int_enable = 0;
1356
1357 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1358 * don't let INT_PWRDETECT sequence begin
1359 */
1360 udelay(250);
1361 writel(PW_RESETB, &regs->power_detect);
1362 readl(&regs->int_enable);
1363 }
1364
1365 static void ep0_start(struct goku_udc *dev)
1366 {
1367 struct goku_udc_regs __iomem *regs = dev->regs;
1368 unsigned i;
1369
1370 VDBG(dev, "%s\n", __FUNCTION__);
1371
1372 udc_reset(dev);
1373 udc_reinit (dev);
1374 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1375
1376 /* hw handles set_address, set_feature, get_status; maybe more */
1377 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1378 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1379 | G_REQMODE_GET_DESC
1380 | G_REQMODE_CLEAR_FEAT
1381 , &regs->reqmode);
1382
1383 for (i = 0; i < 4; i++)
1384 dev->ep[i].irqs = 0;
1385
1386 /* can't modify descriptors after writing UsbReady */
1387 for (i = 0; i < DESC_LEN; i++)
1388 writel(0, &regs->descriptors[i]);
1389 writel(0, &regs->UsbReady);
1390
1391 /* expect ep0 requests when the host drops reset */
1392 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1393 dev->int_enable = INT_DEVWIDE | INT_EP0;
1394 writel(dev->int_enable, &dev->regs->int_enable);
1395 readl(&regs->int_enable);
1396 dev->gadget.speed = USB_SPEED_FULL;
1397 dev->ep0state = EP0_IDLE;
1398 }
1399
1400 static void udc_enable(struct goku_udc *dev)
1401 {
1402 /* start enumeration now, or after power detect irq */
1403 if (readl(&dev->regs->power_detect) & PW_DETECT)
1404 ep0_start(dev);
1405 else {
1406 DBG(dev, "%s\n", __FUNCTION__);
1407 dev->int_enable = INT_PWRDETECT;
1408 writel(dev->int_enable, &dev->regs->int_enable);
1409 }
1410 }
1411
1412 /*-------------------------------------------------------------------------*/
1413
1414 /* keeping it simple:
1415 * - one bus driver, initted first;
1416 * - one function driver, initted second
1417 */
1418
1419 static struct goku_udc *the_controller;
1420
1421 /* when a driver is successfully registered, it will receive
1422 * control requests including set_configuration(), which enables
1423 * non-control requests. then usb traffic follows until a
1424 * disconnect is reported. then a host may connect again, or
1425 * the driver might get unbound.
1426 */
1427 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1428 {
1429 struct goku_udc *dev = the_controller;
1430 int retval;
1431
1432 if (!driver
1433 || driver->speed != USB_SPEED_FULL
1434 || !driver->bind
1435 || !driver->disconnect
1436 || !driver->setup)
1437 return -EINVAL;
1438 if (!dev)
1439 return -ENODEV;
1440 if (dev->driver)
1441 return -EBUSY;
1442
1443 /* hook up the driver */
1444 driver->driver.bus = NULL;
1445 dev->driver = driver;
1446 dev->gadget.dev.driver = &driver->driver;
1447 retval = driver->bind(&dev->gadget);
1448 if (retval) {
1449 DBG(dev, "bind to driver %s --> error %d\n",
1450 driver->driver.name, retval);
1451 dev->driver = NULL;
1452 dev->gadget.dev.driver = NULL;
1453 return retval;
1454 }
1455
1456 /* then enable host detection and ep0; and we're ready
1457 * for set_configuration as well as eventual disconnect.
1458 */
1459 udc_enable(dev);
1460
1461 DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1462 return 0;
1463 }
1464 EXPORT_SYMBOL(usb_gadget_register_driver);
1465
1466 static void
1467 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1468 {
1469 unsigned i;
1470
1471 DBG (dev, "%s\n", __FUNCTION__);
1472
1473 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1474 driver = NULL;
1475
1476 /* disconnect gadget driver after quiesceing hw and the driver */
1477 udc_reset (dev);
1478 for (i = 0; i < 4; i++)
1479 nuke(&dev->ep [i], -ESHUTDOWN);
1480 if (driver) {
1481 spin_unlock(&dev->lock);
1482 driver->disconnect(&dev->gadget);
1483 spin_lock(&dev->lock);
1484 }
1485
1486 if (dev->driver)
1487 udc_enable(dev);
1488 }
1489
1490 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1491 {
1492 struct goku_udc *dev = the_controller;
1493 unsigned long flags;
1494
1495 if (!dev)
1496 return -ENODEV;
1497 if (!driver || driver != dev->driver || !driver->unbind)
1498 return -EINVAL;
1499
1500 spin_lock_irqsave(&dev->lock, flags);
1501 dev->driver = NULL;
1502 stop_activity(dev, driver);
1503 spin_unlock_irqrestore(&dev->lock, flags);
1504
1505 driver->unbind(&dev->gadget);
1506
1507 DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1508 return 0;
1509 }
1510 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1511
1512
1513 /*-------------------------------------------------------------------------*/
1514
1515 static void ep0_setup(struct goku_udc *dev)
1516 {
1517 struct goku_udc_regs __iomem *regs = dev->regs;
1518 struct usb_ctrlrequest ctrl;
1519 int tmp;
1520
1521 /* read SETUP packet and enter DATA stage */
1522 ctrl.bRequestType = readl(&regs->bRequestType);
1523 ctrl.bRequest = readl(&regs->bRequest);
1524 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1525 | readl(&regs->wValueL));
1526 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1527 | readl(&regs->wIndexL));
1528 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1529 | readl(&regs->wLengthL));
1530 writel(0, &regs->SetupRecv);
1531
1532 nuke(&dev->ep[0], 0);
1533 dev->ep[0].stopped = 0;
1534 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1535 dev->ep[0].is_in = 1;
1536 dev->ep0state = EP0_IN;
1537 /* detect early status stages */
1538 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1539 } else {
1540 dev->ep[0].is_in = 0;
1541 dev->ep0state = EP0_OUT;
1542
1543 /* NOTE: CLEAR_FEATURE is done in software so that we can
1544 * synchronize transfer restarts after bulk IN stalls. data
1545 * won't even enter the fifo until the halt is cleared.
1546 */
1547 switch (ctrl.bRequest) {
1548 case USB_REQ_CLEAR_FEATURE:
1549 switch (ctrl.bRequestType) {
1550 case USB_RECIP_ENDPOINT:
1551 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1552 /* active endpoint */
1553 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1554 goto stall;
1555 if (ctrl.wIndex & __constant_cpu_to_le16(
1556 USB_DIR_IN)) {
1557 if (!dev->ep[tmp].is_in)
1558 goto stall;
1559 } else {
1560 if (dev->ep[tmp].is_in)
1561 goto stall;
1562 }
1563 if (ctrl.wValue != __constant_cpu_to_le16(
1564 USB_ENDPOINT_HALT))
1565 goto stall;
1566 if (tmp)
1567 goku_clear_halt(&dev->ep[tmp]);
1568 succeed:
1569 /* start ep0out status stage */
1570 writel(~(1<<0), &regs->EOP);
1571 dev->ep[0].stopped = 1;
1572 dev->ep0state = EP0_STATUS;
1573 return;
1574 case USB_RECIP_DEVICE:
1575 /* device remote wakeup: always clear */
1576 if (ctrl.wValue != __constant_cpu_to_le16(1))
1577 goto stall;
1578 VDBG(dev, "clear dev remote wakeup\n");
1579 goto succeed;
1580 case USB_RECIP_INTERFACE:
1581 goto stall;
1582 default: /* pass to gadget driver */
1583 break;
1584 }
1585 break;
1586 default:
1587 break;
1588 }
1589 }
1590
1591 #ifdef USB_TRACE
1592 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1593 ctrl.bRequestType, ctrl.bRequest,
1594 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1595 le16_to_cpu(ctrl.wLength));
1596 #endif
1597
1598 /* hw wants to know when we're configured (or not) */
1599 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1600 && ctrl.bRequestType == USB_RECIP_DEVICE);
1601 if (unlikely(dev->req_config))
1602 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1603
1604 /* delegate everything to the gadget driver.
1605 * it may respond after this irq handler returns.
1606 */
1607 spin_unlock (&dev->lock);
1608 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1609 spin_lock (&dev->lock);
1610 if (unlikely(tmp < 0)) {
1611 stall:
1612 #ifdef USB_TRACE
1613 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1614 ctrl.bRequestType, ctrl.bRequest, tmp);
1615 #endif
1616 command(regs, COMMAND_STALL, 0);
1617 dev->ep[0].stopped = 1;
1618 dev->ep0state = EP0_STALL;
1619 }
1620
1621 /* expect at least one data or status stage irq */
1622 }
1623
1624 #define ACK(irqbit) { \
1625 stat &= ~irqbit; \
1626 writel(~irqbit, &regs->int_status); \
1627 handled = 1; \
1628 }
1629
1630 static irqreturn_t goku_irq(int irq, void *_dev)
1631 {
1632 struct goku_udc *dev = _dev;
1633 struct goku_udc_regs __iomem *regs = dev->regs;
1634 struct goku_ep *ep;
1635 u32 stat, handled = 0;
1636 unsigned i, rescans = 5;
1637
1638 spin_lock(&dev->lock);
1639
1640 rescan:
1641 stat = readl(&regs->int_status) & dev->int_enable;
1642 if (!stat)
1643 goto done;
1644 dev->irqs++;
1645
1646 /* device-wide irqs */
1647 if (unlikely(stat & INT_DEVWIDE)) {
1648 if (stat & INT_SYSERROR) {
1649 ERROR(dev, "system error\n");
1650 stop_activity(dev, dev->driver);
1651 stat = 0;
1652 handled = 1;
1653 // FIXME have a neater way to prevent re-enumeration
1654 dev->driver = NULL;
1655 goto done;
1656 }
1657 if (stat & INT_PWRDETECT) {
1658 writel(~stat, &regs->int_status);
1659 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1660 VDBG(dev, "connect\n");
1661 ep0_start(dev);
1662 } else {
1663 DBG(dev, "disconnect\n");
1664 if (dev->gadget.speed == USB_SPEED_FULL)
1665 stop_activity(dev, dev->driver);
1666 dev->ep0state = EP0_DISCONNECT;
1667 dev->int_enable = INT_DEVWIDE;
1668 writel(dev->int_enable, &dev->regs->int_enable);
1669 }
1670 stat = 0;
1671 handled = 1;
1672 goto done;
1673 }
1674 if (stat & INT_SUSPEND) {
1675 ACK(INT_SUSPEND);
1676 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1677 switch (dev->ep0state) {
1678 case EP0_DISCONNECT:
1679 case EP0_SUSPEND:
1680 goto pm_next;
1681 default:
1682 break;
1683 }
1684 DBG(dev, "USB suspend\n");
1685 dev->ep0state = EP0_SUSPEND;
1686 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1687 && dev->driver
1688 && dev->driver->suspend) {
1689 spin_unlock(&dev->lock);
1690 dev->driver->suspend(&dev->gadget);
1691 spin_lock(&dev->lock);
1692 }
1693 } else {
1694 if (dev->ep0state != EP0_SUSPEND) {
1695 DBG(dev, "bogus USB resume %d\n",
1696 dev->ep0state);
1697 goto pm_next;
1698 }
1699 DBG(dev, "USB resume\n");
1700 dev->ep0state = EP0_IDLE;
1701 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1702 && dev->driver
1703 && dev->driver->resume) {
1704 spin_unlock(&dev->lock);
1705 dev->driver->resume(&dev->gadget);
1706 spin_lock(&dev->lock);
1707 }
1708 }
1709 }
1710 pm_next:
1711 if (stat & INT_USBRESET) { /* hub reset done */
1712 ACK(INT_USBRESET);
1713 INFO(dev, "USB reset done, gadget %s\n",
1714 dev->driver->driver.name);
1715 }
1716 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1717 }
1718
1719 /* progress ep0 setup, data, or status stages.
1720 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1721 */
1722 if (stat & INT_SETUP) {
1723 ACK(INT_SETUP);
1724 dev->ep[0].irqs++;
1725 ep0_setup(dev);
1726 }
1727 if (stat & INT_STATUSNAK) {
1728 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1729 if (dev->ep0state == EP0_IN) {
1730 ep = &dev->ep[0];
1731 ep->irqs++;
1732 nuke(ep, 0);
1733 writel(~(1<<0), &regs->EOP);
1734 dev->ep0state = EP0_STATUS;
1735 }
1736 }
1737 if (stat & INT_ENDPOINT0) {
1738 ACK(INT_ENDPOINT0);
1739 ep = &dev->ep[0];
1740 ep->irqs++;
1741 pio_advance(ep);
1742 }
1743
1744 /* dma completion */
1745 if (stat & INT_MSTRDEND) { /* IN */
1746 ACK(INT_MSTRDEND);
1747 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1748 ep->irqs++;
1749 dma_advance(dev, ep);
1750 }
1751 if (stat & INT_MSTWREND) { /* OUT */
1752 ACK(INT_MSTWREND);
1753 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1754 ep->irqs++;
1755 dma_advance(dev, ep);
1756 }
1757 if (stat & INT_MSTWRTMOUT) { /* OUT */
1758 ACK(INT_MSTWRTMOUT);
1759 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1760 ep->irqs++;
1761 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1762 // reset dma? then dma_advance()
1763 }
1764
1765 /* pio */
1766 for (i = 1; i < 4; i++) {
1767 u32 tmp = INT_EPxDATASET(i);
1768
1769 if (!(stat & tmp))
1770 continue;
1771 ep = &dev->ep[i];
1772 pio_advance(ep);
1773 if (list_empty (&ep->queue))
1774 pio_irq_disable(dev, regs, i);
1775 stat &= ~tmp;
1776 handled = 1;
1777 ep->irqs++;
1778 }
1779
1780 if (rescans--)
1781 goto rescan;
1782
1783 done:
1784 (void)readl(&regs->int_enable);
1785 spin_unlock(&dev->lock);
1786 if (stat)
1787 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1788 readl(&regs->int_status), dev->int_enable);
1789 return IRQ_RETVAL(handled);
1790 }
1791
1792 #undef ACK
1793
1794 /*-------------------------------------------------------------------------*/
1795
1796 static void gadget_release(struct device *_dev)
1797 {
1798 struct goku_udc *dev = dev_get_drvdata(_dev);
1799
1800 kfree(dev);
1801 }
1802
1803 /* tear down the binding between this driver and the pci device */
1804
1805 static void goku_remove(struct pci_dev *pdev)
1806 {
1807 struct goku_udc *dev = pci_get_drvdata(pdev);
1808
1809 DBG(dev, "%s\n", __FUNCTION__);
1810
1811 BUG_ON(dev->driver);
1812
1813 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1814 remove_proc_entry(proc_node_name, NULL);
1815 #endif
1816 if (dev->regs)
1817 udc_reset(dev);
1818 if (dev->got_irq)
1819 free_irq(pdev->irq, dev);
1820 if (dev->regs)
1821 iounmap(dev->regs);
1822 if (dev->got_region)
1823 release_mem_region(pci_resource_start (pdev, 0),
1824 pci_resource_len (pdev, 0));
1825 if (dev->enabled)
1826 pci_disable_device(pdev);
1827 device_unregister(&dev->gadget.dev);
1828
1829 pci_set_drvdata(pdev, NULL);
1830 dev->regs = NULL;
1831 the_controller = NULL;
1832
1833 INFO(dev, "unbind\n");
1834 }
1835
1836 /* wrap this driver around the specified pci device, but
1837 * don't respond over USB until a gadget driver binds to us.
1838 */
1839
1840 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1841 {
1842 struct goku_udc *dev = NULL;
1843 unsigned long resource, len;
1844 void __iomem *base = NULL;
1845 int retval;
1846
1847 /* if you want to support more than one controller in a system,
1848 * usb_gadget_driver_{register,unregister}() must change.
1849 */
1850 if (the_controller) {
1851 WARN(dev, "ignoring %s\n", pci_name(pdev));
1852 return -EBUSY;
1853 }
1854 if (!pdev->irq) {
1855 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1856 retval = -ENODEV;
1857 goto done;
1858 }
1859
1860 /* alloc, and start init */
1861 dev = kmalloc (sizeof *dev, GFP_KERNEL);
1862 if (dev == NULL){
1863 pr_debug("enomem %s\n", pci_name(pdev));
1864 retval = -ENOMEM;
1865 goto done;
1866 }
1867
1868 memset(dev, 0, sizeof *dev);
1869 spin_lock_init(&dev->lock);
1870 dev->pdev = pdev;
1871 dev->gadget.ops = &goku_ops;
1872
1873 /* the "gadget" abstracts/virtualizes the controller */
1874 strcpy(dev->gadget.dev.bus_id, "gadget");
1875 dev->gadget.dev.parent = &pdev->dev;
1876 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1877 dev->gadget.dev.release = gadget_release;
1878 dev->gadget.name = driver_name;
1879
1880 /* now all the pci goodies ... */
1881 retval = pci_enable_device(pdev);
1882 if (retval < 0) {
1883 DBG(dev, "can't enable, %d\n", retval);
1884 goto done;
1885 }
1886 dev->enabled = 1;
1887
1888 resource = pci_resource_start(pdev, 0);
1889 len = pci_resource_len(pdev, 0);
1890 if (!request_mem_region(resource, len, driver_name)) {
1891 DBG(dev, "controller already in use\n");
1892 retval = -EBUSY;
1893 goto done;
1894 }
1895 dev->got_region = 1;
1896
1897 base = ioremap_nocache(resource, len);
1898 if (base == NULL) {
1899 DBG(dev, "can't map memory\n");
1900 retval = -EFAULT;
1901 goto done;
1902 }
1903 dev->regs = (struct goku_udc_regs __iomem *) base;
1904
1905 pci_set_drvdata(pdev, dev);
1906 INFO(dev, "%s\n", driver_desc);
1907 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1908 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1909
1910 /* init to known state, then setup irqs */
1911 udc_reset(dev);
1912 udc_reinit (dev);
1913 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1914 driver_name, dev) != 0) {
1915 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1916 retval = -EBUSY;
1917 goto done;
1918 }
1919 dev->got_irq = 1;
1920 if (use_dma)
1921 pci_set_master(pdev);
1922
1923
1924 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1925 create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1926 #endif
1927
1928 /* done */
1929 the_controller = dev;
1930 device_register(&dev->gadget.dev);
1931
1932 return 0;
1933
1934 done:
1935 if (dev)
1936 goku_remove (pdev);
1937 return retval;
1938 }
1939
1940
1941 /*-------------------------------------------------------------------------*/
1942
1943 static struct pci_device_id pci_ids [] = { {
1944 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1945 .class_mask = ~0,
1946 .vendor = 0x102f, /* Toshiba */
1947 .device = 0x0107, /* this UDC */
1948 .subvendor = PCI_ANY_ID,
1949 .subdevice = PCI_ANY_ID,
1950
1951 }, { /* end: all zeroes */ }
1952 };
1953 MODULE_DEVICE_TABLE (pci, pci_ids);
1954
1955 static struct pci_driver goku_pci_driver = {
1956 .name = (char *) driver_name,
1957 .id_table = pci_ids,
1958
1959 .probe = goku_probe,
1960 .remove = goku_remove,
1961
1962 /* FIXME add power management support */
1963 };
1964
1965 static int __init init (void)
1966 {
1967 return pci_register_driver (&goku_pci_driver);
1968 }
1969 module_init (init);
1970
1971 static void __exit cleanup (void)
1972 {
1973 pci_unregister_driver (&goku_pci_driver);
1974 }
1975 module_exit (cleanup);
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