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usb gadget stack: remove usb_ep_*_buffer(), part 2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / gadget / goku_udc.c
blobdfadb643597b350d439a3b0bc05844a684177498
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 static void
300 done(struct goku_ep *ep, struct goku_request *req, int status)
301 {
302 struct goku_udc *dev;
303 unsigned stopped = ep->stopped;
304
305 list_del_init(&req->queue);
306
307 if (likely(req->req.status == -EINPROGRESS))
308 req->req.status = status;
309 else
310 status = req->req.status;
311
312 dev = ep->dev;
313 if (req->mapped) {
314 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
315 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
316 req->req.dma = DMA_ADDR_INVALID;
317 req->mapped = 0;
318 }
319
320 #ifndef USB_TRACE
321 if (status && status != -ESHUTDOWN)
322 #endif
323 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
324 ep->ep.name, &req->req, status,
325 req->req.actual, req->req.length);
326
327 /* don't modify queue heads during completion callback */
328 ep->stopped = 1;
329 spin_unlock(&dev->lock);
330 req->req.complete(&ep->ep, &req->req);
331 spin_lock(&dev->lock);
332 ep->stopped = stopped;
333 }
334
335 /*-------------------------------------------------------------------------*/
336
337 static inline int
338 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
339 {
340 unsigned length, count;
341
342 length = min(req->req.length - req->req.actual, max);
343 req->req.actual += length;
344
345 count = length;
346 while (likely(count--))
347 writel(*buf++, fifo);
348 return length;
349 }
350
351 // return: 0 = still running, 1 = completed, negative = errno
352 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
353 {
354 struct goku_udc *dev = ep->dev;
355 u32 tmp;
356 u8 *buf;
357 unsigned count;
358 int is_last;
359
360 tmp = readl(&dev->regs->DataSet);
361 buf = req->req.buf + req->req.actual;
362 prefetch(buf);
363
364 dev = ep->dev;
365 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
366 return -EL2HLT;
367
368 /* NOTE: just single-buffered PIO-IN for now. */
369 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
370 return 0;
371
372 /* clear our "packet available" irq */
373 if (ep->num != 0)
374 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
375
376 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
377
378 /* last packet often short (sometimes a zlp, especially on ep0) */
379 if (unlikely(count != ep->ep.maxpacket)) {
380 writel(~(1<<ep->num), &dev->regs->EOP);
381 if (ep->num == 0) {
382 dev->ep[0].stopped = 1;
383 dev->ep0state = EP0_STATUS;
384 }
385 is_last = 1;
386 } else {
387 if (likely(req->req.length != req->req.actual)
388 || req->req.zero)
389 is_last = 0;
390 else
391 is_last = 1;
392 }
393 #if 0 /* printk seemed to trash is_last...*/
394 //#ifdef USB_TRACE
395 VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
396 ep->ep.name, count, is_last ? "/last" : "",
397 req->req.length - req->req.actual, req);
398 #endif
399
400 /* requests complete when all IN data is in the FIFO,
401 * or sometimes later, if a zlp was needed.
402 */
403 if (is_last) {
404 done(ep, req, 0);
405 return 1;
406 }
407
408 return 0;
409 }
410
411 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
412 {
413 struct goku_udc_regs __iomem *regs;
414 u32 size, set;
415 u8 *buf;
416 unsigned bufferspace, is_short, dbuff;
417
418 regs = ep->dev->regs;
419 top:
420 buf = req->req.buf + req->req.actual;
421 prefetchw(buf);
422
423 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
424 return -EL2HLT;
425
426 dbuff = (ep->num == 1 || ep->num == 2);
427 do {
428 /* ack dataset irq matching the status we'll handle */
429 if (ep->num != 0)
430 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
431
432 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
433 size = readl(&regs->EPxSizeLA[ep->num]);
434 bufferspace = req->req.length - req->req.actual;
435
436 /* usually do nothing without an OUT packet */
437 if (likely(ep->num != 0 || bufferspace != 0)) {
438 if (unlikely(set == 0))
439 break;
440 /* use ep1/ep2 double-buffering for OUT */
441 if (!(size & PACKET_ACTIVE))
442 size = readl(&regs->EPxSizeLB[ep->num]);
443 if (!(size & PACKET_ACTIVE)) // "can't happen"
444 break;
445 size &= DATASIZE; /* EPxSizeH == 0 */
446
447 /* ep0out no-out-data case for set_config, etc */
448 } else
449 size = 0;
450
451 /* read all bytes from this packet */
452 req->req.actual += size;
453 is_short = (size < ep->ep.maxpacket);
454 #ifdef USB_TRACE
455 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
456 ep->ep.name, size, is_short ? "/S" : "",
457 req, req->req.actual, req->req.length);
458 #endif
459 while (likely(size-- != 0)) {
460 u8 byte = (u8) readl(ep->reg_fifo);
461
462 if (unlikely(bufferspace == 0)) {
463 /* this happens when the driver's buffer
464 * is smaller than what the host sent.
465 * discard the extra data in this packet.
466 */
467 if (req->req.status != -EOVERFLOW)
468 DBG(ep->dev, "%s overflow %u\n",
469 ep->ep.name, size);
470 req->req.status = -EOVERFLOW;
471 } else {
472 *buf++ = byte;
473 bufferspace--;
474 }
475 }
476
477 /* completion */
478 if (unlikely(is_short || req->req.actual == req->req.length)) {
479 if (unlikely(ep->num == 0)) {
480 /* non-control endpoints now usable? */
481 if (ep->dev->req_config)
482 writel(ep->dev->configured
483 ? USBSTATE_CONFIGURED
484 : 0,
485 &regs->UsbState);
486 /* ep0out status stage */
487 writel(~(1<<0), &regs->EOP);
488 ep->stopped = 1;
489 ep->dev->ep0state = EP0_STATUS;
490 }
491 done(ep, req, 0);
492
493 /* empty the second buffer asap */
494 if (dbuff && !list_empty(&ep->queue)) {
495 req = list_entry(ep->queue.next,
496 struct goku_request, queue);
497 goto top;
498 }
499 return 1;
500 }
501 } while (dbuff);
502 return 0;
503 }
504
505 static inline void
506 pio_irq_enable(struct goku_udc *dev,
507 struct goku_udc_regs __iomem *regs, int epnum)
508 {
509 dev->int_enable |= INT_EPxDATASET (epnum);
510 writel(dev->int_enable, &regs->int_enable);
511 /* write may still be posted */
512 }
513
514 static inline void
515 pio_irq_disable(struct goku_udc *dev,
516 struct goku_udc_regs __iomem *regs, int epnum)
517 {
518 dev->int_enable &= ~INT_EPxDATASET (epnum);
519 writel(dev->int_enable, &regs->int_enable);
520 /* write may still be posted */
521 }
522
523 static inline void
524 pio_advance(struct goku_ep *ep)
525 {
526 struct goku_request *req;
527
528 if (unlikely(list_empty (&ep->queue)))
529 return;
530 req = list_entry(ep->queue.next, struct goku_request, queue);
531 (ep->is_in ? write_fifo : read_fifo)(ep, req);
532 }
533
534
535 /*-------------------------------------------------------------------------*/
536
537 // return: 0 = q running, 1 = q stopped, negative = errno
538 static int start_dma(struct goku_ep *ep, struct goku_request *req)
539 {
540 struct goku_udc_regs __iomem *regs = ep->dev->regs;
541 u32 master;
542 u32 start = req->req.dma;
543 u32 end = start + req->req.length - 1;
544
545 master = readl(&regs->dma_master) & MST_RW_BITS;
546
547 /* re-init the bits affecting IN dma; careful with zlps */
548 if (likely(ep->is_in)) {
549 if (unlikely(master & MST_RD_ENA)) {
550 DBG (ep->dev, "start, IN active dma %03x!!\n",
551 master);
552 // return -EL2HLT;
553 }
554 writel(end, &regs->in_dma_end);
555 writel(start, &regs->in_dma_start);
556
557 master &= ~MST_R_BITS;
558 if (unlikely(req->req.length == 0))
559 master = MST_RD_ENA | MST_RD_EOPB;
560 else if ((req->req.length % ep->ep.maxpacket) != 0
561 || req->req.zero)
562 master = MST_RD_ENA | MST_EOPB_ENA;
563 else
564 master = MST_RD_ENA | MST_EOPB_DIS;
565
566 ep->dev->int_enable |= INT_MSTRDEND;
567
568 /* Goku DMA-OUT merges short packets, which plays poorly with
569 * protocols where short packets mark the transfer boundaries.
570 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
571 * ending transfers after 3 SOFs; we don't turn it on.
572 */
573 } else {
574 if (unlikely(master & MST_WR_ENA)) {
575 DBG (ep->dev, "start, OUT active dma %03x!!\n",
576 master);
577 // return -EL2HLT;
578 }
579 writel(end, &regs->out_dma_end);
580 writel(start, &regs->out_dma_start);
581
582 master &= ~MST_W_BITS;
583 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
584
585 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
586 }
587
588 writel(master, &regs->dma_master);
589 writel(ep->dev->int_enable, &regs->int_enable);
590 return 0;
591 }
592
593 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
594 {
595 struct goku_request *req;
596 struct goku_udc_regs __iomem *regs = ep->dev->regs;
597 u32 master;
598
599 master = readl(&regs->dma_master);
600
601 if (unlikely(list_empty(&ep->queue))) {
602 stop:
603 if (ep->is_in)
604 dev->int_enable &= ~INT_MSTRDEND;
605 else
606 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
607 writel(dev->int_enable, &regs->int_enable);
608 return;
609 }
610 req = list_entry(ep->queue.next, struct goku_request, queue);
611
612 /* normal hw dma completion (not abort) */
613 if (likely(ep->is_in)) {
614 if (unlikely(master & MST_RD_ENA))
615 return;
616 req->req.actual = readl(&regs->in_dma_current);
617 } else {
618 if (unlikely(master & MST_WR_ENA))
619 return;
620
621 /* hardware merges short packets, and also hides packet
622 * overruns. a partial packet MAY be in the fifo here.
623 */
624 req->req.actual = readl(&regs->out_dma_current);
625 }
626 req->req.actual -= req->req.dma;
627 req->req.actual++;
628
629 #ifdef USB_TRACE
630 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
631 ep->ep.name, ep->is_in ? "IN" : "OUT",
632 req->req.actual, req->req.length, req);
633 #endif
634 done(ep, req, 0);
635 if (list_empty(&ep->queue))
636 goto stop;
637 req = list_entry(ep->queue.next, struct goku_request, queue);
638 (void) start_dma(ep, req);
639 }
640
641 static void abort_dma(struct goku_ep *ep, int status)
642 {
643 struct goku_udc_regs __iomem *regs = ep->dev->regs;
644 struct goku_request *req;
645 u32 curr, master;
646
647 /* NAK future host requests, hoping the implicit delay lets the
648 * dma engine finish reading (or writing) its latest packet and
649 * empty the dma buffer (up to 16 bytes).
650 *
651 * This avoids needing to clean up a partial packet in the fifo;
652 * we can't do that for IN without side effects to HALT and TOGGLE.
653 */
654 command(regs, COMMAND_FIFO_DISABLE, ep->num);
655 req = list_entry(ep->queue.next, struct goku_request, queue);
656 master = readl(&regs->dma_master) & MST_RW_BITS;
657
658 /* FIXME using these resets isn't usably documented. this may
659 * not work unless it's followed by disabling the endpoint.
660 *
661 * FIXME the OUT reset path doesn't even behave consistently.
662 */
663 if (ep->is_in) {
664 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
665 goto finished;
666 curr = readl(&regs->in_dma_current);
667
668 writel(curr, &regs->in_dma_end);
669 writel(curr, &regs->in_dma_start);
670
671 master &= ~MST_R_BITS;
672 master |= MST_RD_RESET;
673 writel(master, &regs->dma_master);
674
675 if (readl(&regs->dma_master) & MST_RD_ENA)
676 DBG(ep->dev, "IN dma active after reset!\n");
677
678 } else {
679 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
680 goto finished;
681 curr = readl(&regs->out_dma_current);
682
683 writel(curr, &regs->out_dma_end);
684 writel(curr, &regs->out_dma_start);
685
686 master &= ~MST_W_BITS;
687 master |= MST_WR_RESET;
688 writel(master, &regs->dma_master);
689
690 if (readl(&regs->dma_master) & MST_WR_ENA)
691 DBG(ep->dev, "OUT dma active after reset!\n");
692 }
693 req->req.actual = (curr - req->req.dma) + 1;
694 req->req.status = status;
695
696 VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
697 ep->is_in ? "IN" : "OUT",
698 req->req.actual, req->req.length);
699
700 command(regs, COMMAND_FIFO_ENABLE, ep->num);
701
702 return;
703
704 finished:
705 /* dma already completed; no abort needed */
706 command(regs, COMMAND_FIFO_ENABLE, ep->num);
707 req->req.actual = req->req.length;
708 req->req.status = 0;
709 }
710
711 /*-------------------------------------------------------------------------*/
712
713 static int
714 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
715 {
716 struct goku_request *req;
717 struct goku_ep *ep;
718 struct goku_udc *dev;
719 unsigned long flags;
720 int status;
721
722 /* always require a cpu-view buffer so pio works */
723 req = container_of(_req, struct goku_request, req);
724 if (unlikely(!_req || !_req->complete
725 || !_req->buf || !list_empty(&req->queue)))
726 return -EINVAL;
727 ep = container_of(_ep, struct goku_ep, ep);
728 if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
729 return -EINVAL;
730 dev = ep->dev;
731 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
732 return -ESHUTDOWN;
733
734 /* can't touch registers when suspended */
735 if (dev->ep0state == EP0_SUSPEND)
736 return -EBUSY;
737
738 /* set up dma mapping in case the caller didn't */
739 if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
740 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
741 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
742 req->mapped = 1;
743 }
744
745 #ifdef USB_TRACE
746 VDBG(dev, "%s queue req %p, len %u buf %p\n",
747 _ep->name, _req, _req->length, _req->buf);
748 #endif
749
750 spin_lock_irqsave(&dev->lock, flags);
751
752 _req->status = -EINPROGRESS;
753 _req->actual = 0;
754
755 /* for ep0 IN without premature status, zlp is required and
756 * writing EOP starts the status stage (OUT).
757 */
758 if (unlikely(ep->num == 0 && ep->is_in))
759 _req->zero = 1;
760
761 /* kickstart this i/o queue? */
762 status = 0;
763 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
764 /* dma: done after dma completion IRQ (or error)
765 * pio: done after last fifo operation
766 */
767 if (ep->dma)
768 status = start_dma(ep, req);
769 else
770 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
771
772 if (unlikely(status != 0)) {
773 if (status > 0)
774 status = 0;
775 req = NULL;
776 }
777
778 } /* else pio or dma irq handler advances the queue. */
779
780 if (likely(req != 0))
781 list_add_tail(&req->queue, &ep->queue);
782
783 if (likely(!list_empty(&ep->queue))
784 && likely(ep->num != 0)
785 && !ep->dma
786 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
787 pio_irq_enable(dev, dev->regs, ep->num);
788
789 spin_unlock_irqrestore(&dev->lock, flags);
790
791 /* pci writes may still be posted */
792 return status;
793 }
794
795 /* dequeue ALL requests */
796 static void nuke(struct goku_ep *ep, int status)
797 {
798 struct goku_request *req;
799
800 ep->stopped = 1;
801 if (list_empty(&ep->queue))
802 return;
803 if (ep->dma)
804 abort_dma(ep, status);
805 while (!list_empty(&ep->queue)) {
806 req = list_entry(ep->queue.next, struct goku_request, queue);
807 done(ep, req, status);
808 }
809 }
810
811 /* dequeue JUST ONE request */
812 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
813 {
814 struct goku_request *req;
815 struct goku_ep *ep;
816 struct goku_udc *dev;
817 unsigned long flags;
818
819 ep = container_of(_ep, struct goku_ep, ep);
820 if (!_ep || !_req || (!ep->desc && ep->num != 0))
821 return -EINVAL;
822 dev = ep->dev;
823 if (!dev->driver)
824 return -ESHUTDOWN;
825
826 /* we can't touch (dma) registers when suspended */
827 if (dev->ep0state == EP0_SUSPEND)
828 return -EBUSY;
829
830 VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
831 ep->is_in ? "IN" : "OUT",
832 ep->dma ? "dma" : "pio",
833 _req);
834
835 spin_lock_irqsave(&dev->lock, flags);
836
837 /* make sure it's actually queued on this endpoint */
838 list_for_each_entry (req, &ep->queue, queue) {
839 if (&req->req == _req)
840 break;
841 }
842 if (&req->req != _req) {
843 spin_unlock_irqrestore (&dev->lock, flags);
844 return -EINVAL;
845 }
846
847 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
848 abort_dma(ep, -ECONNRESET);
849 done(ep, req, -ECONNRESET);
850 dma_advance(dev, ep);
851 } else if (!list_empty(&req->queue))
852 done(ep, req, -ECONNRESET);
853 else
854 req = NULL;
855 spin_unlock_irqrestore(&dev->lock, flags);
856
857 return req ? 0 : -EOPNOTSUPP;
858 }
859
860 /*-------------------------------------------------------------------------*/
861
862 static void goku_clear_halt(struct goku_ep *ep)
863 {
864 // assert (ep->num !=0)
865 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
866 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
867 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
868 if (ep->stopped) {
869 ep->stopped = 0;
870 if (ep->dma) {
871 struct goku_request *req;
872
873 if (list_empty(&ep->queue))
874 return;
875 req = list_entry(ep->queue.next, struct goku_request,
876 queue);
877 (void) start_dma(ep, req);
878 } else
879 pio_advance(ep);
880 }
881 }
882
883 static int goku_set_halt(struct usb_ep *_ep, int value)
884 {
885 struct goku_ep *ep;
886 unsigned long flags;
887 int retval = 0;
888
889 if (!_ep)
890 return -ENODEV;
891 ep = container_of (_ep, struct goku_ep, ep);
892
893 if (ep->num == 0) {
894 if (value) {
895 ep->dev->ep0state = EP0_STALL;
896 ep->dev->ep[0].stopped = 1;
897 } else
898 return -EINVAL;
899
900 /* don't change EPxSTATUS_EP_INVALID to READY */
901 } else if (!ep->desc) {
902 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
903 return -EINVAL;
904 }
905
906 spin_lock_irqsave(&ep->dev->lock, flags);
907 if (!list_empty(&ep->queue))
908 retval = -EAGAIN;
909 else if (ep->is_in && value
910 /* data in (either) packet buffer? */
911 && (readl(&ep->dev->regs->DataSet)
912 & DATASET_AB(ep->num)))
913 retval = -EAGAIN;
914 else if (!value)
915 goku_clear_halt(ep);
916 else {
917 ep->stopped = 1;
918 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
919 command(ep->dev->regs, COMMAND_STALL, ep->num);
920 readl(ep->reg_status);
921 }
922 spin_unlock_irqrestore(&ep->dev->lock, flags);
923 return retval;
924 }
925
926 static int goku_fifo_status(struct usb_ep *_ep)
927 {
928 struct goku_ep *ep;
929 struct goku_udc_regs __iomem *regs;
930 u32 size;
931
932 if (!_ep)
933 return -ENODEV;
934 ep = container_of(_ep, struct goku_ep, ep);
935
936 /* size is only reported sanely for OUT */
937 if (ep->is_in)
938 return -EOPNOTSUPP;
939
940 /* ignores 16-byte dma buffer; SizeH == 0 */
941 regs = ep->dev->regs;
942 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
943 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
944 VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
945 return size;
946 }
947
948 static void goku_fifo_flush(struct usb_ep *_ep)
949 {
950 struct goku_ep *ep;
951 struct goku_udc_regs __iomem *regs;
952 u32 size;
953
954 if (!_ep)
955 return;
956 ep = container_of(_ep, struct goku_ep, ep);
957 VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
958
959 /* don't change EPxSTATUS_EP_INVALID to READY */
960 if (!ep->desc && ep->num != 0) {
961 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
962 return;
963 }
964
965 regs = ep->dev->regs;
966 size = readl(&regs->EPxSizeLA[ep->num]);
967 size &= DATASIZE;
968
969 /* Non-desirable behavior: FIFO_CLEAR also clears the
970 * endpoint halt feature. For OUT, we _could_ just read
971 * the bytes out (PIO, if !ep->dma); for in, no choice.
972 */
973 if (size)
974 command(regs, COMMAND_FIFO_CLEAR, ep->num);
975 }
976
977 static struct usb_ep_ops goku_ep_ops = {
978 .enable = goku_ep_enable,
979 .disable = goku_ep_disable,
980
981 .alloc_request = goku_alloc_request,
982 .free_request = goku_free_request,
983
984 .queue = goku_queue,
985 .dequeue = goku_dequeue,
986
987 .set_halt = goku_set_halt,
988 .fifo_status = goku_fifo_status,
989 .fifo_flush = goku_fifo_flush,
990 };
991
992 /*-------------------------------------------------------------------------*/
993
994 static int goku_get_frame(struct usb_gadget *_gadget)
995 {
996 return -EOPNOTSUPP;
997 }
998
999 static const struct usb_gadget_ops goku_ops = {
1000 .get_frame = goku_get_frame,
1001 // no remote wakeup
1002 // not selfpowered
1003 };
1004
1005 /*-------------------------------------------------------------------------*/
1006
1007 static inline char *dmastr(void)
1008 {
1009 if (use_dma == 0)
1010 return "(dma disabled)";
1011 else if (use_dma == 2)
1012 return "(dma IN and OUT)";
1013 else
1014 return "(dma IN)";
1015 }
1016
1017 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1018
1019 static const char proc_node_name [] = "driver/udc";
1020
1021 #define FOURBITS "%s%s%s%s"
1022 #define EIGHTBITS FOURBITS FOURBITS
1023
1024 static void
1025 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1026 {
1027 int t;
1028
1029 /* int_status is the same format ... */
1030 t = scnprintf(*next, *size,
1031 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1032 label, mask,
1033 (mask & INT_PWRDETECT) ? " power" : "",
1034 (mask & INT_SYSERROR) ? " sys" : "",
1035 (mask & INT_MSTRDEND) ? " in-dma" : "",
1036 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1037
1038 (mask & INT_MSTWREND) ? " out-dma" : "",
1039 (mask & INT_MSTWRSET) ? " wrset" : "",
1040 (mask & INT_ERR) ? " err" : "",
1041 (mask & INT_SOF) ? " sof" : "",
1042
1043 (mask & INT_EP3NAK) ? " ep3nak" : "",
1044 (mask & INT_EP2NAK) ? " ep2nak" : "",
1045 (mask & INT_EP1NAK) ? " ep1nak" : "",
1046 (mask & INT_EP3DATASET) ? " ep3" : "",
1047
1048 (mask & INT_EP2DATASET) ? " ep2" : "",
1049 (mask & INT_EP1DATASET) ? " ep1" : "",
1050 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1051 (mask & INT_STATUS) ? " ep0status" : "",
1052
1053 (mask & INT_SETUP) ? " setup" : "",
1054 (mask & INT_ENDPOINT0) ? " ep0" : "",
1055 (mask & INT_USBRESET) ? " reset" : "",
1056 (mask & INT_SUSPEND) ? " suspend" : "");
1057 *size -= t;
1058 *next += t;
1059 }
1060
1061
1062 static int
1063 udc_proc_read(char *buffer, char **start, off_t off, int count,
1064 int *eof, void *_dev)
1065 {
1066 char *buf = buffer;
1067 struct goku_udc *dev = _dev;
1068 struct goku_udc_regs __iomem *regs = dev->regs;
1069 char *next = buf;
1070 unsigned size = count;
1071 unsigned long flags;
1072 int i, t, is_usb_connected;
1073 u32 tmp;
1074
1075 if (off != 0)
1076 return 0;
1077
1078 local_irq_save(flags);
1079
1080 /* basic device status */
1081 tmp = readl(&regs->power_detect);
1082 is_usb_connected = tmp & PW_DETECT;
1083 t = scnprintf(next, size,
1084 "%s - %s\n"
1085 "%s version: %s %s\n"
1086 "Gadget driver: %s\n"
1087 "Host %s, %s\n"
1088 "\n",
1089 pci_name(dev->pdev), driver_desc,
1090 driver_name, DRIVER_VERSION, dmastr(),
1091 dev->driver ? dev->driver->driver.name : "(none)",
1092 is_usb_connected
1093 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1094 : "disconnected",
1095 ({char *tmp;
1096 switch(dev->ep0state){
1097 case EP0_DISCONNECT: tmp = "ep0_disconnect"; break;
1098 case EP0_IDLE: tmp = "ep0_idle"; break;
1099 case EP0_IN: tmp = "ep0_in"; break;
1100 case EP0_OUT: tmp = "ep0_out"; break;
1101 case EP0_STATUS: tmp = "ep0_status"; break;
1102 case EP0_STALL: tmp = "ep0_stall"; break;
1103 case EP0_SUSPEND: tmp = "ep0_suspend"; break;
1104 default: tmp = "ep0_?"; break;
1105 } tmp; })
1106 );
1107 size -= t;
1108 next += t;
1109
1110 dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1111 dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1112
1113 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1114 goto done;
1115
1116 /* registers for (active) device and ep0 */
1117 t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1118 "single.bcs %02x.%02x state %x addr %u\n",
1119 dev->irqs, readl(&regs->DataSet),
1120 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1121 readl(&regs->UsbState),
1122 readl(&regs->address));
1123 size -= t;
1124 next += t;
1125
1126 tmp = readl(&regs->dma_master);
1127 t = scnprintf(next, size,
1128 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1129 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1130 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1131 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1132 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1133
1134 (tmp & MST_RD_EOPB) ? " eopb" : "",
1135 (tmp & MST_RD_RESET) ? " in_reset" : "",
1136 (tmp & MST_WR_RESET) ? " out_reset" : "",
1137 (tmp & MST_RD_ENA) ? " IN" : "",
1138
1139 (tmp & MST_WR_ENA) ? " OUT" : "",
1140 (tmp & MST_CONNECTION)
1141 ? "ep1in/ep2out"
1142 : "ep1out/ep2in");
1143 size -= t;
1144 next += t;
1145
1146 /* dump endpoint queues */
1147 for (i = 0; i < 4; i++) {
1148 struct goku_ep *ep = &dev->ep [i];
1149 struct goku_request *req;
1150 int t;
1151
1152 if (i && !ep->desc)
1153 continue;
1154
1155 tmp = readl(ep->reg_status);
1156 t = scnprintf(next, size,
1157 "%s %s max %u %s, irqs %lu, "
1158 "status %02x (%s) " FOURBITS "\n",
1159 ep->ep.name,
1160 ep->is_in ? "in" : "out",
1161 ep->ep.maxpacket,
1162 ep->dma ? "dma" : "pio",
1163 ep->irqs,
1164 tmp, ({ char *s;
1165 switch (tmp & EPxSTATUS_EP_MASK) {
1166 case EPxSTATUS_EP_READY:
1167 s = "ready"; break;
1168 case EPxSTATUS_EP_DATAIN:
1169 s = "packet"; break;
1170 case EPxSTATUS_EP_FULL:
1171 s = "full"; break;
1172 case EPxSTATUS_EP_TX_ERR: // host will retry
1173 s = "tx_err"; break;
1174 case EPxSTATUS_EP_RX_ERR:
1175 s = "rx_err"; break;
1176 case EPxSTATUS_EP_BUSY: /* ep0 only */
1177 s = "busy"; break;
1178 case EPxSTATUS_EP_STALL:
1179 s = "stall"; break;
1180 case EPxSTATUS_EP_INVALID: // these "can't happen"
1181 s = "invalid"; break;
1182 default:
1183 s = "?"; break;
1184 }; s; }),
1185 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1186 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1187 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1188 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1189 );
1190 if (t <= 0 || t > size)
1191 goto done;
1192 size -= t;
1193 next += t;
1194
1195 if (list_empty(&ep->queue)) {
1196 t = scnprintf(next, size, "\t(nothing queued)\n");
1197 if (t <= 0 || t > size)
1198 goto done;
1199 size -= t;
1200 next += t;
1201 continue;
1202 }
1203 list_for_each_entry(req, &ep->queue, queue) {
1204 if (ep->dma && req->queue.prev == &ep->queue) {
1205 if (i == UDC_MSTRD_ENDPOINT)
1206 tmp = readl(&regs->in_dma_current);
1207 else
1208 tmp = readl(&regs->out_dma_current);
1209 tmp -= req->req.dma;
1210 tmp++;
1211 } else
1212 tmp = req->req.actual;
1213
1214 t = scnprintf(next, size,
1215 "\treq %p len %u/%u buf %p\n",
1216 &req->req, tmp, req->req.length,
1217 req->req.buf);
1218 if (t <= 0 || t > size)
1219 goto done;
1220 size -= t;
1221 next += t;
1222 }
1223 }
1224
1225 done:
1226 local_irq_restore(flags);
1227 *eof = 1;
1228 return count - size;
1229 }
1230
1231 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1232
1233 /*-------------------------------------------------------------------------*/
1234
1235 static void udc_reinit (struct goku_udc *dev)
1236 {
1237 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1238
1239 unsigned i;
1240
1241 INIT_LIST_HEAD (&dev->gadget.ep_list);
1242 dev->gadget.ep0 = &dev->ep [0].ep;
1243 dev->gadget.speed = USB_SPEED_UNKNOWN;
1244 dev->ep0state = EP0_DISCONNECT;
1245 dev->irqs = 0;
1246
1247 for (i = 0; i < 4; i++) {
1248 struct goku_ep *ep = &dev->ep[i];
1249
1250 ep->num = i;
1251 ep->ep.name = names[i];
1252 ep->reg_fifo = &dev->regs->ep_fifo [i];
1253 ep->reg_status = &dev->regs->ep_status [i];
1254 ep->reg_mode = &dev->regs->ep_mode[i];
1255
1256 ep->ep.ops = &goku_ep_ops;
1257 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1258 ep->dev = dev;
1259 INIT_LIST_HEAD (&ep->queue);
1260
1261 ep_reset(NULL, ep);
1262 }
1263
1264 dev->ep[0].reg_mode = NULL;
1265 dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1266 list_del_init (&dev->ep[0].ep.ep_list);
1267 }
1268
1269 static void udc_reset(struct goku_udc *dev)
1270 {
1271 struct goku_udc_regs __iomem *regs = dev->regs;
1272
1273 writel(0, &regs->power_detect);
1274 writel(0, &regs->int_enable);
1275 readl(&regs->int_enable);
1276 dev->int_enable = 0;
1277
1278 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1279 * don't let INT_PWRDETECT sequence begin
1280 */
1281 udelay(250);
1282 writel(PW_RESETB, &regs->power_detect);
1283 readl(&regs->int_enable);
1284 }
1285
1286 static void ep0_start(struct goku_udc *dev)
1287 {
1288 struct goku_udc_regs __iomem *regs = dev->regs;
1289 unsigned i;
1290
1291 VDBG(dev, "%s\n", __FUNCTION__);
1292
1293 udc_reset(dev);
1294 udc_reinit (dev);
1295 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1296
1297 /* hw handles set_address, set_feature, get_status; maybe more */
1298 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1299 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1300 | G_REQMODE_GET_DESC
1301 | G_REQMODE_CLEAR_FEAT
1302 , &regs->reqmode);
1303
1304 for (i = 0; i < 4; i++)
1305 dev->ep[i].irqs = 0;
1306
1307 /* can't modify descriptors after writing UsbReady */
1308 for (i = 0; i < DESC_LEN; i++)
1309 writel(0, &regs->descriptors[i]);
1310 writel(0, &regs->UsbReady);
1311
1312 /* expect ep0 requests when the host drops reset */
1313 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1314 dev->int_enable = INT_DEVWIDE | INT_EP0;
1315 writel(dev->int_enable, &dev->regs->int_enable);
1316 readl(&regs->int_enable);
1317 dev->gadget.speed = USB_SPEED_FULL;
1318 dev->ep0state = EP0_IDLE;
1319 }
1320
1321 static void udc_enable(struct goku_udc *dev)
1322 {
1323 /* start enumeration now, or after power detect irq */
1324 if (readl(&dev->regs->power_detect) & PW_DETECT)
1325 ep0_start(dev);
1326 else {
1327 DBG(dev, "%s\n", __FUNCTION__);
1328 dev->int_enable = INT_PWRDETECT;
1329 writel(dev->int_enable, &dev->regs->int_enable);
1330 }
1331 }
1332
1333 /*-------------------------------------------------------------------------*/
1334
1335 /* keeping it simple:
1336 * - one bus driver, initted first;
1337 * - one function driver, initted second
1338 */
1339
1340 static struct goku_udc *the_controller;
1341
1342 /* when a driver is successfully registered, it will receive
1343 * control requests including set_configuration(), which enables
1344 * non-control requests. then usb traffic follows until a
1345 * disconnect is reported. then a host may connect again, or
1346 * the driver might get unbound.
1347 */
1348 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1349 {
1350 struct goku_udc *dev = the_controller;
1351 int retval;
1352
1353 if (!driver
1354 || driver->speed != USB_SPEED_FULL
1355 || !driver->bind
1356 || !driver->disconnect
1357 || !driver->setup)
1358 return -EINVAL;
1359 if (!dev)
1360 return -ENODEV;
1361 if (dev->driver)
1362 return -EBUSY;
1363
1364 /* hook up the driver */
1365 driver->driver.bus = NULL;
1366 dev->driver = driver;
1367 dev->gadget.dev.driver = &driver->driver;
1368 retval = driver->bind(&dev->gadget);
1369 if (retval) {
1370 DBG(dev, "bind to driver %s --> error %d\n",
1371 driver->driver.name, retval);
1372 dev->driver = NULL;
1373 dev->gadget.dev.driver = NULL;
1374 return retval;
1375 }
1376
1377 /* then enable host detection and ep0; and we're ready
1378 * for set_configuration as well as eventual disconnect.
1379 */
1380 udc_enable(dev);
1381
1382 DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1383 return 0;
1384 }
1385 EXPORT_SYMBOL(usb_gadget_register_driver);
1386
1387 static void
1388 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1389 {
1390 unsigned i;
1391
1392 DBG (dev, "%s\n", __FUNCTION__);
1393
1394 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1395 driver = NULL;
1396
1397 /* disconnect gadget driver after quiesceing hw and the driver */
1398 udc_reset (dev);
1399 for (i = 0; i < 4; i++)
1400 nuke(&dev->ep [i], -ESHUTDOWN);
1401 if (driver) {
1402 spin_unlock(&dev->lock);
1403 driver->disconnect(&dev->gadget);
1404 spin_lock(&dev->lock);
1405 }
1406
1407 if (dev->driver)
1408 udc_enable(dev);
1409 }
1410
1411 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1412 {
1413 struct goku_udc *dev = the_controller;
1414 unsigned long flags;
1415
1416 if (!dev)
1417 return -ENODEV;
1418 if (!driver || driver != dev->driver || !driver->unbind)
1419 return -EINVAL;
1420
1421 spin_lock_irqsave(&dev->lock, flags);
1422 dev->driver = NULL;
1423 stop_activity(dev, driver);
1424 spin_unlock_irqrestore(&dev->lock, flags);
1425
1426 driver->unbind(&dev->gadget);
1427
1428 DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1429 return 0;
1430 }
1431 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1432
1433
1434 /*-------------------------------------------------------------------------*/
1435
1436 static void ep0_setup(struct goku_udc *dev)
1437 {
1438 struct goku_udc_regs __iomem *regs = dev->regs;
1439 struct usb_ctrlrequest ctrl;
1440 int tmp;
1441
1442 /* read SETUP packet and enter DATA stage */
1443 ctrl.bRequestType = readl(&regs->bRequestType);
1444 ctrl.bRequest = readl(&regs->bRequest);
1445 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1446 | readl(&regs->wValueL));
1447 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1448 | readl(&regs->wIndexL));
1449 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1450 | readl(&regs->wLengthL));
1451 writel(0, &regs->SetupRecv);
1452
1453 nuke(&dev->ep[0], 0);
1454 dev->ep[0].stopped = 0;
1455 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1456 dev->ep[0].is_in = 1;
1457 dev->ep0state = EP0_IN;
1458 /* detect early status stages */
1459 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1460 } else {
1461 dev->ep[0].is_in = 0;
1462 dev->ep0state = EP0_OUT;
1463
1464 /* NOTE: CLEAR_FEATURE is done in software so that we can
1465 * synchronize transfer restarts after bulk IN stalls. data
1466 * won't even enter the fifo until the halt is cleared.
1467 */
1468 switch (ctrl.bRequest) {
1469 case USB_REQ_CLEAR_FEATURE:
1470 switch (ctrl.bRequestType) {
1471 case USB_RECIP_ENDPOINT:
1472 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1473 /* active endpoint */
1474 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1475 goto stall;
1476 if (ctrl.wIndex & __constant_cpu_to_le16(
1477 USB_DIR_IN)) {
1478 if (!dev->ep[tmp].is_in)
1479 goto stall;
1480 } else {
1481 if (dev->ep[tmp].is_in)
1482 goto stall;
1483 }
1484 if (ctrl.wValue != __constant_cpu_to_le16(
1485 USB_ENDPOINT_HALT))
1486 goto stall;
1487 if (tmp)
1488 goku_clear_halt(&dev->ep[tmp]);
1489 succeed:
1490 /* start ep0out status stage */
1491 writel(~(1<<0), &regs->EOP);
1492 dev->ep[0].stopped = 1;
1493 dev->ep0state = EP0_STATUS;
1494 return;
1495 case USB_RECIP_DEVICE:
1496 /* device remote wakeup: always clear */
1497 if (ctrl.wValue != __constant_cpu_to_le16(1))
1498 goto stall;
1499 VDBG(dev, "clear dev remote wakeup\n");
1500 goto succeed;
1501 case USB_RECIP_INTERFACE:
1502 goto stall;
1503 default: /* pass to gadget driver */
1504 break;
1505 }
1506 break;
1507 default:
1508 break;
1509 }
1510 }
1511
1512 #ifdef USB_TRACE
1513 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1514 ctrl.bRequestType, ctrl.bRequest,
1515 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1516 le16_to_cpu(ctrl.wLength));
1517 #endif
1518
1519 /* hw wants to know when we're configured (or not) */
1520 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1521 && ctrl.bRequestType == USB_RECIP_DEVICE);
1522 if (unlikely(dev->req_config))
1523 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1524
1525 /* delegate everything to the gadget driver.
1526 * it may respond after this irq handler returns.
1527 */
1528 spin_unlock (&dev->lock);
1529 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1530 spin_lock (&dev->lock);
1531 if (unlikely(tmp < 0)) {
1532 stall:
1533 #ifdef USB_TRACE
1534 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1535 ctrl.bRequestType, ctrl.bRequest, tmp);
1536 #endif
1537 command(regs, COMMAND_STALL, 0);
1538 dev->ep[0].stopped = 1;
1539 dev->ep0state = EP0_STALL;
1540 }
1541
1542 /* expect at least one data or status stage irq */
1543 }
1544
1545 #define ACK(irqbit) { \
1546 stat &= ~irqbit; \
1547 writel(~irqbit, &regs->int_status); \
1548 handled = 1; \
1549 }
1550
1551 static irqreturn_t goku_irq(int irq, void *_dev)
1552 {
1553 struct goku_udc *dev = _dev;
1554 struct goku_udc_regs __iomem *regs = dev->regs;
1555 struct goku_ep *ep;
1556 u32 stat, handled = 0;
1557 unsigned i, rescans = 5;
1558
1559 spin_lock(&dev->lock);
1560
1561 rescan:
1562 stat = readl(&regs->int_status) & dev->int_enable;
1563 if (!stat)
1564 goto done;
1565 dev->irqs++;
1566
1567 /* device-wide irqs */
1568 if (unlikely(stat & INT_DEVWIDE)) {
1569 if (stat & INT_SYSERROR) {
1570 ERROR(dev, "system error\n");
1571 stop_activity(dev, dev->driver);
1572 stat = 0;
1573 handled = 1;
1574 // FIXME have a neater way to prevent re-enumeration
1575 dev->driver = NULL;
1576 goto done;
1577 }
1578 if (stat & INT_PWRDETECT) {
1579 writel(~stat, &regs->int_status);
1580 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1581 VDBG(dev, "connect\n");
1582 ep0_start(dev);
1583 } else {
1584 DBG(dev, "disconnect\n");
1585 if (dev->gadget.speed == USB_SPEED_FULL)
1586 stop_activity(dev, dev->driver);
1587 dev->ep0state = EP0_DISCONNECT;
1588 dev->int_enable = INT_DEVWIDE;
1589 writel(dev->int_enable, &dev->regs->int_enable);
1590 }
1591 stat = 0;
1592 handled = 1;
1593 goto done;
1594 }
1595 if (stat & INT_SUSPEND) {
1596 ACK(INT_SUSPEND);
1597 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1598 switch (dev->ep0state) {
1599 case EP0_DISCONNECT:
1600 case EP0_SUSPEND:
1601 goto pm_next;
1602 default:
1603 break;
1604 }
1605 DBG(dev, "USB suspend\n");
1606 dev->ep0state = EP0_SUSPEND;
1607 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1608 && dev->driver
1609 && dev->driver->suspend) {
1610 spin_unlock(&dev->lock);
1611 dev->driver->suspend(&dev->gadget);
1612 spin_lock(&dev->lock);
1613 }
1614 } else {
1615 if (dev->ep0state != EP0_SUSPEND) {
1616 DBG(dev, "bogus USB resume %d\n",
1617 dev->ep0state);
1618 goto pm_next;
1619 }
1620 DBG(dev, "USB resume\n");
1621 dev->ep0state = EP0_IDLE;
1622 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1623 && dev->driver
1624 && dev->driver->resume) {
1625 spin_unlock(&dev->lock);
1626 dev->driver->resume(&dev->gadget);
1627 spin_lock(&dev->lock);
1628 }
1629 }
1630 }
1631 pm_next:
1632 if (stat & INT_USBRESET) { /* hub reset done */
1633 ACK(INT_USBRESET);
1634 INFO(dev, "USB reset done, gadget %s\n",
1635 dev->driver->driver.name);
1636 }
1637 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1638 }
1639
1640 /* progress ep0 setup, data, or status stages.
1641 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1642 */
1643 if (stat & INT_SETUP) {
1644 ACK(INT_SETUP);
1645 dev->ep[0].irqs++;
1646 ep0_setup(dev);
1647 }
1648 if (stat & INT_STATUSNAK) {
1649 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1650 if (dev->ep0state == EP0_IN) {
1651 ep = &dev->ep[0];
1652 ep->irqs++;
1653 nuke(ep, 0);
1654 writel(~(1<<0), &regs->EOP);
1655 dev->ep0state = EP0_STATUS;
1656 }
1657 }
1658 if (stat & INT_ENDPOINT0) {
1659 ACK(INT_ENDPOINT0);
1660 ep = &dev->ep[0];
1661 ep->irqs++;
1662 pio_advance(ep);
1663 }
1664
1665 /* dma completion */
1666 if (stat & INT_MSTRDEND) { /* IN */
1667 ACK(INT_MSTRDEND);
1668 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1669 ep->irqs++;
1670 dma_advance(dev, ep);
1671 }
1672 if (stat & INT_MSTWREND) { /* OUT */
1673 ACK(INT_MSTWREND);
1674 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1675 ep->irqs++;
1676 dma_advance(dev, ep);
1677 }
1678 if (stat & INT_MSTWRTMOUT) { /* OUT */
1679 ACK(INT_MSTWRTMOUT);
1680 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1681 ep->irqs++;
1682 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1683 // reset dma? then dma_advance()
1684 }
1685
1686 /* pio */
1687 for (i = 1; i < 4; i++) {
1688 u32 tmp = INT_EPxDATASET(i);
1689
1690 if (!(stat & tmp))
1691 continue;
1692 ep = &dev->ep[i];
1693 pio_advance(ep);
1694 if (list_empty (&ep->queue))
1695 pio_irq_disable(dev, regs, i);
1696 stat &= ~tmp;
1697 handled = 1;
1698 ep->irqs++;
1699 }
1700
1701 if (rescans--)
1702 goto rescan;
1703
1704 done:
1705 (void)readl(&regs->int_enable);
1706 spin_unlock(&dev->lock);
1707 if (stat)
1708 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1709 readl(&regs->int_status), dev->int_enable);
1710 return IRQ_RETVAL(handled);
1711 }
1712
1713 #undef ACK
1714
1715 /*-------------------------------------------------------------------------*/
1716
1717 static void gadget_release(struct device *_dev)
1718 {
1719 struct goku_udc *dev = dev_get_drvdata(_dev);
1720
1721 kfree(dev);
1722 }
1723
1724 /* tear down the binding between this driver and the pci device */
1725
1726 static void goku_remove(struct pci_dev *pdev)
1727 {
1728 struct goku_udc *dev = pci_get_drvdata(pdev);
1729
1730 DBG(dev, "%s\n", __FUNCTION__);
1731
1732 BUG_ON(dev->driver);
1733
1734 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1735 remove_proc_entry(proc_node_name, NULL);
1736 #endif
1737 if (dev->regs)
1738 udc_reset(dev);
1739 if (dev->got_irq)
1740 free_irq(pdev->irq, dev);
1741 if (dev->regs)
1742 iounmap(dev->regs);
1743 if (dev->got_region)
1744 release_mem_region(pci_resource_start (pdev, 0),
1745 pci_resource_len (pdev, 0));
1746 if (dev->enabled)
1747 pci_disable_device(pdev);
1748 device_unregister(&dev->gadget.dev);
1749
1750 pci_set_drvdata(pdev, NULL);
1751 dev->regs = NULL;
1752 the_controller = NULL;
1753
1754 INFO(dev, "unbind\n");
1755 }
1756
1757 /* wrap this driver around the specified pci device, but
1758 * don't respond over USB until a gadget driver binds to us.
1759 */
1760
1761 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1762 {
1763 struct goku_udc *dev = NULL;
1764 unsigned long resource, len;
1765 void __iomem *base = NULL;
1766 int retval;
1767
1768 /* if you want to support more than one controller in a system,
1769 * usb_gadget_driver_{register,unregister}() must change.
1770 */
1771 if (the_controller) {
1772 WARN(dev, "ignoring %s\n", pci_name(pdev));
1773 return -EBUSY;
1774 }
1775 if (!pdev->irq) {
1776 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1777 retval = -ENODEV;
1778 goto done;
1779 }
1780
1781 /* alloc, and start init */
1782 dev = kmalloc (sizeof *dev, GFP_KERNEL);
1783 if (dev == NULL){
1784 pr_debug("enomem %s\n", pci_name(pdev));
1785 retval = -ENOMEM;
1786 goto done;
1787 }
1788
1789 memset(dev, 0, sizeof *dev);
1790 spin_lock_init(&dev->lock);
1791 dev->pdev = pdev;
1792 dev->gadget.ops = &goku_ops;
1793
1794 /* the "gadget" abstracts/virtualizes the controller */
1795 strcpy(dev->gadget.dev.bus_id, "gadget");
1796 dev->gadget.dev.parent = &pdev->dev;
1797 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1798 dev->gadget.dev.release = gadget_release;
1799 dev->gadget.name = driver_name;
1800
1801 /* now all the pci goodies ... */
1802 retval = pci_enable_device(pdev);
1803 if (retval < 0) {
1804 DBG(dev, "can't enable, %d\n", retval);
1805 goto done;
1806 }
1807 dev->enabled = 1;
1808
1809 resource = pci_resource_start(pdev, 0);
1810 len = pci_resource_len(pdev, 0);
1811 if (!request_mem_region(resource, len, driver_name)) {
1812 DBG(dev, "controller already in use\n");
1813 retval = -EBUSY;
1814 goto done;
1815 }
1816 dev->got_region = 1;
1817
1818 base = ioremap_nocache(resource, len);
1819 if (base == NULL) {
1820 DBG(dev, "can't map memory\n");
1821 retval = -EFAULT;
1822 goto done;
1823 }
1824 dev->regs = (struct goku_udc_regs __iomem *) base;
1825
1826 pci_set_drvdata(pdev, dev);
1827 INFO(dev, "%s\n", driver_desc);
1828 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1829 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1830
1831 /* init to known state, then setup irqs */
1832 udc_reset(dev);
1833 udc_reinit (dev);
1834 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1835 driver_name, dev) != 0) {
1836 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1837 retval = -EBUSY;
1838 goto done;
1839 }
1840 dev->got_irq = 1;
1841 if (use_dma)
1842 pci_set_master(pdev);
1843
1844
1845 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1846 create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1847 #endif
1848
1849 /* done */
1850 the_controller = dev;
1851 device_register(&dev->gadget.dev);
1852
1853 return 0;
1854
1855 done:
1856 if (dev)
1857 goku_remove (pdev);
1858 return retval;
1859 }
1860
1861
1862 /*-------------------------------------------------------------------------*/
1863
1864 static struct pci_device_id pci_ids [] = { {
1865 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1866 .class_mask = ~0,
1867 .vendor = 0x102f, /* Toshiba */
1868 .device = 0x0107, /* this UDC */
1869 .subvendor = PCI_ANY_ID,
1870 .subdevice = PCI_ANY_ID,
1871
1872 }, { /* end: all zeroes */ }
1873 };
1874 MODULE_DEVICE_TABLE (pci, pci_ids);
1875
1876 static struct pci_driver goku_pci_driver = {
1877 .name = (char *) driver_name,
1878 .id_table = pci_ids,
1879
1880 .probe = goku_probe,
1881 .remove = goku_remove,
1882
1883 /* FIXME add power management support */
1884 };
1885
1886 static int __init init (void)
1887 {
1888 return pci_register_driver (&goku_pci_driver);
1889 }
1890 module_init (init);
1891
1892 static void __exit cleanup (void)
1893 {
1894 pci_unregister_driver (&goku_pci_driver);
1895 }
1896 module_exit (cleanup);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree