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Add linux-next specific files for 20110421
[linux-2.6/next.git] / drivers / usb / gadget / langwell_udc.c
blob9cee88a43a73e1893cb9373d0e22b5b331347aed
1 /*
2 * Intel Langwell USB Device Controller driver
3 * Copyright (C) 2008-2009, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 */
19
20
21 /* #undef DEBUG */
22 /* #undef VERBOSE_DEBUG */
23
24 #if defined(CONFIG_USB_LANGWELL_OTG)
25 #define OTG_TRANSCEIVER
26 #endif
27
28
29 #include <linux/module.h>
30 #include <linux/pci.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/kernel.h>
33 #include <linux/delay.h>
34 #include <linux/ioport.h>
35 #include <linux/sched.h>
36 #include <linux/slab.h>
37 #include <linux/errno.h>
38 #include <linux/init.h>
39 #include <linux/timer.h>
40 #include <linux/list.h>
41 #include <linux/interrupt.h>
42 #include <linux/moduleparam.h>
43 #include <linux/device.h>
44 #include <linux/usb/ch9.h>
45 #include <linux/usb/gadget.h>
46 #include <linux/usb/otg.h>
47 #include <linux/pm.h>
48 #include <linux/io.h>
49 #include <linux/irq.h>
50 #include <asm/system.h>
51 #include <asm/unaligned.h>
52
53 #include "langwell_udc.h"
54
55
56 #define DRIVER_DESC "Intel Langwell USB Device Controller driver"
57 #define DRIVER_VERSION "16 May 2009"
58
59 static const char driver_name[] = "langwell_udc";
60 static const char driver_desc[] = DRIVER_DESC;
61
62
63 /* controller device global variable */
64 static struct langwell_udc *the_controller;
65
66 /* for endpoint 0 operations */
67 static const struct usb_endpoint_descriptor
68 langwell_ep0_desc = {
69 .bLength = USB_DT_ENDPOINT_SIZE,
70 .bDescriptorType = USB_DT_ENDPOINT,
71 .bEndpointAddress = 0,
72 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
73 .wMaxPacketSize = EP0_MAX_PKT_SIZE,
74 };
75
76
77 /*-------------------------------------------------------------------------*/
78 /* debugging */
79
80 #ifdef VERBOSE_DEBUG
81 static inline void print_all_registers(struct langwell_udc *dev)
82 {
83 int i;
84
85 /* Capability Registers */
86 dev_dbg(&dev->pdev->dev,
87 "Capability Registers (offset: 0x%04x, length: 0x%08x)\n",
88 CAP_REG_OFFSET, (u32)sizeof(struct langwell_cap_regs));
89 dev_dbg(&dev->pdev->dev, "caplength=0x%02x\n",
90 readb(&dev->cap_regs->caplength));
91 dev_dbg(&dev->pdev->dev, "hciversion=0x%04x\n",
92 readw(&dev->cap_regs->hciversion));
93 dev_dbg(&dev->pdev->dev, "hcsparams=0x%08x\n",
94 readl(&dev->cap_regs->hcsparams));
95 dev_dbg(&dev->pdev->dev, "hccparams=0x%08x\n",
96 readl(&dev->cap_regs->hccparams));
97 dev_dbg(&dev->pdev->dev, "dciversion=0x%04x\n",
98 readw(&dev->cap_regs->dciversion));
99 dev_dbg(&dev->pdev->dev, "dccparams=0x%08x\n",
100 readl(&dev->cap_regs->dccparams));
101
102 /* Operational Registers */
103 dev_dbg(&dev->pdev->dev,
104 "Operational Registers (offset: 0x%04x, length: 0x%08x)\n",
105 OP_REG_OFFSET, (u32)sizeof(struct langwell_op_regs));
106 dev_dbg(&dev->pdev->dev, "extsts=0x%08x\n",
107 readl(&dev->op_regs->extsts));
108 dev_dbg(&dev->pdev->dev, "extintr=0x%08x\n",
109 readl(&dev->op_regs->extintr));
110 dev_dbg(&dev->pdev->dev, "usbcmd=0x%08x\n",
111 readl(&dev->op_regs->usbcmd));
112 dev_dbg(&dev->pdev->dev, "usbsts=0x%08x\n",
113 readl(&dev->op_regs->usbsts));
114 dev_dbg(&dev->pdev->dev, "usbintr=0x%08x\n",
115 readl(&dev->op_regs->usbintr));
116 dev_dbg(&dev->pdev->dev, "frindex=0x%08x\n",
117 readl(&dev->op_regs->frindex));
118 dev_dbg(&dev->pdev->dev, "ctrldssegment=0x%08x\n",
119 readl(&dev->op_regs->ctrldssegment));
120 dev_dbg(&dev->pdev->dev, "deviceaddr=0x%08x\n",
121 readl(&dev->op_regs->deviceaddr));
122 dev_dbg(&dev->pdev->dev, "endpointlistaddr=0x%08x\n",
123 readl(&dev->op_regs->endpointlistaddr));
124 dev_dbg(&dev->pdev->dev, "ttctrl=0x%08x\n",
125 readl(&dev->op_regs->ttctrl));
126 dev_dbg(&dev->pdev->dev, "burstsize=0x%08x\n",
127 readl(&dev->op_regs->burstsize));
128 dev_dbg(&dev->pdev->dev, "txfilltuning=0x%08x\n",
129 readl(&dev->op_regs->txfilltuning));
130 dev_dbg(&dev->pdev->dev, "txttfilltuning=0x%08x\n",
131 readl(&dev->op_regs->txttfilltuning));
132 dev_dbg(&dev->pdev->dev, "ic_usb=0x%08x\n",
133 readl(&dev->op_regs->ic_usb));
134 dev_dbg(&dev->pdev->dev, "ulpi_viewport=0x%08x\n",
135 readl(&dev->op_regs->ulpi_viewport));
136 dev_dbg(&dev->pdev->dev, "configflag=0x%08x\n",
137 readl(&dev->op_regs->configflag));
138 dev_dbg(&dev->pdev->dev, "portsc1=0x%08x\n",
139 readl(&dev->op_regs->portsc1));
140 dev_dbg(&dev->pdev->dev, "devlc=0x%08x\n",
141 readl(&dev->op_regs->devlc));
142 dev_dbg(&dev->pdev->dev, "otgsc=0x%08x\n",
143 readl(&dev->op_regs->otgsc));
144 dev_dbg(&dev->pdev->dev, "usbmode=0x%08x\n",
145 readl(&dev->op_regs->usbmode));
146 dev_dbg(&dev->pdev->dev, "endptnak=0x%08x\n",
147 readl(&dev->op_regs->endptnak));
148 dev_dbg(&dev->pdev->dev, "endptnaken=0x%08x\n",
149 readl(&dev->op_regs->endptnaken));
150 dev_dbg(&dev->pdev->dev, "endptsetupstat=0x%08x\n",
151 readl(&dev->op_regs->endptsetupstat));
152 dev_dbg(&dev->pdev->dev, "endptprime=0x%08x\n",
153 readl(&dev->op_regs->endptprime));
154 dev_dbg(&dev->pdev->dev, "endptflush=0x%08x\n",
155 readl(&dev->op_regs->endptflush));
156 dev_dbg(&dev->pdev->dev, "endptstat=0x%08x\n",
157 readl(&dev->op_regs->endptstat));
158 dev_dbg(&dev->pdev->dev, "endptcomplete=0x%08x\n",
159 readl(&dev->op_regs->endptcomplete));
160
161 for (i = 0; i < dev->ep_max / 2; i++) {
162 dev_dbg(&dev->pdev->dev, "endptctrl[%d]=0x%08x\n",
163 i, readl(&dev->op_regs->endptctrl[i]));
164 }
165 }
166 #else
167
168 #define print_all_registers(dev) do { } while (0)
169
170 #endif /* VERBOSE_DEBUG */
171
172
173 /*-------------------------------------------------------------------------*/
174
175 #define is_in(ep) (((ep)->ep_num == 0) ? ((ep)->dev->ep0_dir == \
176 USB_DIR_IN) : (usb_endpoint_dir_in((ep)->desc)))
177
178 #define DIR_STRING(ep) (is_in(ep) ? "in" : "out")
179
180
181 static char *type_string(const struct usb_endpoint_descriptor *desc)
182 {
183 switch (usb_endpoint_type(desc)) {
184 case USB_ENDPOINT_XFER_BULK:
185 return "bulk";
186 case USB_ENDPOINT_XFER_ISOC:
187 return "iso";
188 case USB_ENDPOINT_XFER_INT:
189 return "int";
190 };
191
192 return "control";
193 }
194
195
196 /* configure endpoint control registers */
197 static void ep_reset(struct langwell_ep *ep, unsigned char ep_num,
198 unsigned char is_in, unsigned char ep_type)
199 {
200 struct langwell_udc *dev;
201 u32 endptctrl;
202
203 dev = ep->dev;
204 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
205
206 endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
207 if (is_in) { /* TX */
208 if (ep_num)
209 endptctrl |= EPCTRL_TXR;
210 endptctrl |= EPCTRL_TXE;
211 endptctrl |= ep_type << EPCTRL_TXT_SHIFT;
212 } else { /* RX */
213 if (ep_num)
214 endptctrl |= EPCTRL_RXR;
215 endptctrl |= EPCTRL_RXE;
216 endptctrl |= ep_type << EPCTRL_RXT_SHIFT;
217 }
218
219 writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
220
221 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
222 }
223
224
225 /* reset ep0 dQH and endptctrl */
226 static void ep0_reset(struct langwell_udc *dev)
227 {
228 struct langwell_ep *ep;
229 int i;
230
231 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
232
233 /* ep0 in and out */
234 for (i = 0; i < 2; i++) {
235 ep = &dev->ep[i];
236 ep->dev = dev;
237
238 /* ep0 dQH */
239 ep->dqh = &dev->ep_dqh[i];
240
241 /* configure ep0 endpoint capabilities in dQH */
242 ep->dqh->dqh_ios = 1;
243 ep->dqh->dqh_mpl = EP0_MAX_PKT_SIZE;
244
245 /* enable ep0-in HW zero length termination select */
246 if (is_in(ep))
247 ep->dqh->dqh_zlt = 0;
248 ep->dqh->dqh_mult = 0;
249
250 ep->dqh->dtd_next = DTD_TERM;
251
252 /* configure ep0 control registers */
253 ep_reset(&dev->ep[0], 0, i, USB_ENDPOINT_XFER_CONTROL);
254 }
255
256 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
257 }
258
259
260 /*-------------------------------------------------------------------------*/
261
262 /* endpoints operations */
263
264 /* configure endpoint, making it usable */
265 static int langwell_ep_enable(struct usb_ep *_ep,
266 const struct usb_endpoint_descriptor *desc)
267 {
268 struct langwell_udc *dev;
269 struct langwell_ep *ep;
270 u16 max = 0;
271 unsigned long flags;
272 int i, retval = 0;
273 unsigned char zlt, ios = 0, mult = 0;
274
275 ep = container_of(_ep, struct langwell_ep, ep);
276 dev = ep->dev;
277 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
278
279 if (!_ep || !desc || ep->desc
280 || desc->bDescriptorType != USB_DT_ENDPOINT)
281 return -EINVAL;
282
283 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
284 return -ESHUTDOWN;
285
286 max = le16_to_cpu(desc->wMaxPacketSize);
287
288 /*
289 * disable HW zero length termination select
290 * driver handles zero length packet through req->req.zero
291 */
292 zlt = 1;
293
294 /*
295 * sanity check type, direction, address, and then
296 * initialize the endpoint capabilities fields in dQH
297 */
298 switch (usb_endpoint_type(desc)) {
299 case USB_ENDPOINT_XFER_CONTROL:
300 ios = 1;
301 break;
302 case USB_ENDPOINT_XFER_BULK:
303 if ((dev->gadget.speed == USB_SPEED_HIGH
304 && max != 512)
305 || (dev->gadget.speed == USB_SPEED_FULL
306 && max > 64)) {
307 goto done;
308 }
309 break;
310 case USB_ENDPOINT_XFER_INT:
311 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
312 goto done;
313
314 switch (dev->gadget.speed) {
315 case USB_SPEED_HIGH:
316 if (max <= 1024)
317 break;
318 case USB_SPEED_FULL:
319 if (max <= 64)
320 break;
321 default:
322 if (max <= 8)
323 break;
324 goto done;
325 }
326 break;
327 case USB_ENDPOINT_XFER_ISOC:
328 if (strstr(ep->ep.name, "-bulk")
329 || strstr(ep->ep.name, "-int"))
330 goto done;
331
332 switch (dev->gadget.speed) {
333 case USB_SPEED_HIGH:
334 if (max <= 1024)
335 break;
336 case USB_SPEED_FULL:
337 if (max <= 1023)
338 break;
339 default:
340 goto done;
341 }
342 /*
343 * FIXME:
344 * calculate transactions needed for high bandwidth iso
345 */
346 mult = (unsigned char)(1 + ((max >> 11) & 0x03));
347 max = max & 0x8ff; /* bit 0~10 */
348 /* 3 transactions at most */
349 if (mult > 3)
350 goto done;
351 break;
352 default:
353 goto done;
354 }
355
356 spin_lock_irqsave(&dev->lock, flags);
357
358 ep->ep.maxpacket = max;
359 ep->desc = desc;
360 ep->stopped = 0;
361 ep->ep_num = usb_endpoint_num(desc);
362
363 /* ep_type */
364 ep->ep_type = usb_endpoint_type(desc);
365
366 /* configure endpoint control registers */
367 ep_reset(ep, ep->ep_num, is_in(ep), ep->ep_type);
368
369 /* configure endpoint capabilities in dQH */
370 i = ep->ep_num * 2 + is_in(ep);
371 ep->dqh = &dev->ep_dqh[i];
372 ep->dqh->dqh_ios = ios;
373 ep->dqh->dqh_mpl = cpu_to_le16(max);
374 ep->dqh->dqh_zlt = zlt;
375 ep->dqh->dqh_mult = mult;
376 ep->dqh->dtd_next = DTD_TERM;
377
378 dev_dbg(&dev->pdev->dev, "enabled %s (ep%d%s-%s), max %04x\n",
379 _ep->name,
380 ep->ep_num,
381 DIR_STRING(ep),
382 type_string(desc),
383 max);
384
385 spin_unlock_irqrestore(&dev->lock, flags);
386 done:
387 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
388 return retval;
389 }
390
391
392 /*-------------------------------------------------------------------------*/
393
394 /* retire a request */
395 static void done(struct langwell_ep *ep, struct langwell_request *req,
396 int status)
397 {
398 struct langwell_udc *dev = ep->dev;
399 unsigned stopped = ep->stopped;
400 struct langwell_dtd *curr_dtd, *next_dtd;
401 int i;
402
403 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
404
405 /* remove the req from ep->queue */
406 list_del_init(&req->queue);
407
408 if (req->req.status == -EINPROGRESS)
409 req->req.status = status;
410 else
411 status = req->req.status;
412
413 /* free dTD for the request */
414 next_dtd = req->head;
415 for (i = 0; i < req->dtd_count; i++) {
416 curr_dtd = next_dtd;
417 if (i != req->dtd_count - 1)
418 next_dtd = curr_dtd->next_dtd_virt;
419 dma_pool_free(dev->dtd_pool, curr_dtd, curr_dtd->dtd_dma);
420 }
421
422 if (req->mapped) {
423 dma_unmap_single(&dev->pdev->dev,
424 req->req.dma, req->req.length,
425 is_in(ep) ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
426 req->req.dma = DMA_ADDR_INVALID;
427 req->mapped = 0;
428 } else
429 dma_sync_single_for_cpu(&dev->pdev->dev, req->req.dma,
430 req->req.length,
431 is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
432
433 if (status != -ESHUTDOWN)
434 dev_dbg(&dev->pdev->dev,
435 "complete %s, req %p, stat %d, len %u/%u\n",
436 ep->ep.name, &req->req, status,
437 req->req.actual, req->req.length);
438
439 /* don't modify queue heads during completion callback */
440 ep->stopped = 1;
441
442 spin_unlock(&dev->lock);
443 /* complete routine from gadget driver */
444 if (req->req.complete)
445 req->req.complete(&ep->ep, &req->req);
446
447 spin_lock(&dev->lock);
448 ep->stopped = stopped;
449
450 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
451 }
452
453
454 static void langwell_ep_fifo_flush(struct usb_ep *_ep);
455
456 /* delete all endpoint requests, called with spinlock held */
457 static void nuke(struct langwell_ep *ep, int status)
458 {
459 /* called with spinlock held */
460 ep->stopped = 1;
461
462 /* endpoint fifo flush */
463 if (&ep->ep && ep->desc)
464 langwell_ep_fifo_flush(&ep->ep);
465
466 while (!list_empty(&ep->queue)) {
467 struct langwell_request *req = NULL;
468 req = list_entry(ep->queue.next, struct langwell_request,
469 queue);
470 done(ep, req, status);
471 }
472 }
473
474
475 /*-------------------------------------------------------------------------*/
476
477 /* endpoint is no longer usable */
478 static int langwell_ep_disable(struct usb_ep *_ep)
479 {
480 struct langwell_ep *ep;
481 unsigned long flags;
482 struct langwell_udc *dev;
483 int ep_num;
484 u32 endptctrl;
485
486 ep = container_of(_ep, struct langwell_ep, ep);
487 dev = ep->dev;
488 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
489
490 if (!_ep || !ep->desc)
491 return -EINVAL;
492
493 spin_lock_irqsave(&dev->lock, flags);
494
495 /* disable endpoint control register */
496 ep_num = ep->ep_num;
497 endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
498 if (is_in(ep))
499 endptctrl &= ~EPCTRL_TXE;
500 else
501 endptctrl &= ~EPCTRL_RXE;
502 writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
503
504 /* nuke all pending requests (does flush) */
505 nuke(ep, -ESHUTDOWN);
506
507 ep->desc = NULL;
508 ep->stopped = 1;
509
510 spin_unlock_irqrestore(&dev->lock, flags);
511
512 dev_dbg(&dev->pdev->dev, "disabled %s\n", _ep->name);
513 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
514
515 return 0;
516 }
517
518
519 /* allocate a request object to use with this endpoint */
520 static struct usb_request *langwell_alloc_request(struct usb_ep *_ep,
521 gfp_t gfp_flags)
522 {
523 struct langwell_ep *ep;
524 struct langwell_udc *dev;
525 struct langwell_request *req = NULL;
526
527 if (!_ep)
528 return NULL;
529
530 ep = container_of(_ep, struct langwell_ep, ep);
531 dev = ep->dev;
532 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
533
534 req = kzalloc(sizeof(*req), gfp_flags);
535 if (!req)
536 return NULL;
537
538 req->req.dma = DMA_ADDR_INVALID;
539 INIT_LIST_HEAD(&req->queue);
540
541 dev_vdbg(&dev->pdev->dev, "alloc request for %s\n", _ep->name);
542 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
543 return &req->req;
544 }
545
546
547 /* free a request object */
548 static void langwell_free_request(struct usb_ep *_ep,
549 struct usb_request *_req)
550 {
551 struct langwell_ep *ep;
552 struct langwell_udc *dev;
553 struct langwell_request *req = NULL;
554
555 ep = container_of(_ep, struct langwell_ep, ep);
556 dev = ep->dev;
557 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
558
559 if (!_ep || !_req)
560 return;
561
562 req = container_of(_req, struct langwell_request, req);
563 WARN_ON(!list_empty(&req->queue));
564
565 if (_req)
566 kfree(req);
567
568 dev_vdbg(&dev->pdev->dev, "free request for %s\n", _ep->name);
569 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
570 }
571
572
573 /*-------------------------------------------------------------------------*/
574
575 /* queue dTD and PRIME endpoint */
576 static int queue_dtd(struct langwell_ep *ep, struct langwell_request *req)
577 {
578 u32 bit_mask, usbcmd, endptstat, dtd_dma;
579 u8 dtd_status;
580 int i;
581 struct langwell_dqh *dqh;
582 struct langwell_udc *dev;
583
584 dev = ep->dev;
585 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
586
587 i = ep->ep_num * 2 + is_in(ep);
588 dqh = &dev->ep_dqh[i];
589
590 if (ep->ep_num)
591 dev_vdbg(&dev->pdev->dev, "%s\n", ep->name);
592 else
593 /* ep0 */
594 dev_vdbg(&dev->pdev->dev, "%s-%s\n", ep->name, DIR_STRING(ep));
595
596 dev_vdbg(&dev->pdev->dev, "ep_dqh[%d] addr: 0x%08x\n",
597 i, (u32)&(dev->ep_dqh[i]));
598
599 bit_mask = is_in(ep) ?
600 (1 << (ep->ep_num + 16)) : (1 << (ep->ep_num));
601
602 dev_vdbg(&dev->pdev->dev, "bit_mask = 0x%08x\n", bit_mask);
603
604 /* check if the pipe is empty */
605 if (!(list_empty(&ep->queue))) {
606 /* add dTD to the end of linked list */
607 struct langwell_request *lastreq;
608 lastreq = list_entry(ep->queue.prev,
609 struct langwell_request, queue);
610
611 lastreq->tail->dtd_next =
612 cpu_to_le32(req->head->dtd_dma & DTD_NEXT_MASK);
613
614 /* read prime bit, if 1 goto out */
615 if (readl(&dev->op_regs->endptprime) & bit_mask)
616 goto out;
617
618 do {
619 /* set ATDTW bit in USBCMD */
620 usbcmd = readl(&dev->op_regs->usbcmd);
621 writel(usbcmd | CMD_ATDTW, &dev->op_regs->usbcmd);
622
623 /* read correct status bit */
624 endptstat = readl(&dev->op_regs->endptstat) & bit_mask;
625
626 } while (!(readl(&dev->op_regs->usbcmd) & CMD_ATDTW));
627
628 /* write ATDTW bit to 0 */
629 usbcmd = readl(&dev->op_regs->usbcmd);
630 writel(usbcmd & ~CMD_ATDTW, &dev->op_regs->usbcmd);
631
632 if (endptstat)
633 goto out;
634 }
635
636 /* write dQH next pointer and terminate bit to 0 */
637 dtd_dma = req->head->dtd_dma & DTD_NEXT_MASK;
638 dqh->dtd_next = cpu_to_le32(dtd_dma);
639
640 /* clear active and halt bit */
641 dtd_status = (u8) ~(DTD_STS_ACTIVE | DTD_STS_HALTED);
642 dqh->dtd_status &= dtd_status;
643 dev_vdbg(&dev->pdev->dev, "dqh->dtd_status = 0x%x\n", dqh->dtd_status);
644
645 /* ensure that updates to the dQH will occur before priming */
646 wmb();
647
648 /* write 1 to endptprime register to PRIME endpoint */
649 bit_mask = is_in(ep) ? (1 << (ep->ep_num + 16)) : (1 << ep->ep_num);
650 dev_vdbg(&dev->pdev->dev, "endprime bit_mask = 0x%08x\n", bit_mask);
651 writel(bit_mask, &dev->op_regs->endptprime);
652 out:
653 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
654 return 0;
655 }
656
657
658 /* fill in the dTD structure to build a transfer descriptor */
659 static struct langwell_dtd *build_dtd(struct langwell_request *req,
660 unsigned *length, dma_addr_t *dma, int *is_last)
661 {
662 u32 buf_ptr;
663 struct langwell_dtd *dtd;
664 struct langwell_udc *dev;
665 int i;
666
667 dev = req->ep->dev;
668 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
669
670 /* the maximum transfer length, up to 16k bytes */
671 *length = min(req->req.length - req->req.actual,
672 (unsigned)DTD_MAX_TRANSFER_LENGTH);
673
674 /* create dTD dma_pool resource */
675 dtd = dma_pool_alloc(dev->dtd_pool, GFP_KERNEL, dma);
676 if (dtd == NULL)
677 return dtd;
678 dtd->dtd_dma = *dma;
679
680 /* initialize buffer page pointers */
681 buf_ptr = (u32)(req->req.dma + req->req.actual);
682 for (i = 0; i < 5; i++)
683 dtd->dtd_buf[i] = cpu_to_le32(buf_ptr + i * PAGE_SIZE);
684
685 req->req.actual += *length;
686
687 /* fill in total bytes with transfer size */
688 dtd->dtd_total = cpu_to_le16(*length);
689 dev_vdbg(&dev->pdev->dev, "dtd->dtd_total = %d\n", dtd->dtd_total);
690
691 /* set is_last flag if req->req.zero is set or not */
692 if (req->req.zero) {
693 if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0)
694 *is_last = 1;
695 else
696 *is_last = 0;
697 } else if (req->req.length == req->req.actual) {
698 *is_last = 1;
699 } else
700 *is_last = 0;
701
702 if (*is_last == 0)
703 dev_vdbg(&dev->pdev->dev, "multi-dtd request!\n");
704
705 /* set interrupt on complete bit for the last dTD */
706 if (*is_last && !req->req.no_interrupt)
707 dtd->dtd_ioc = 1;
708
709 /* set multiplier override 0 for non-ISO and non-TX endpoint */
710 dtd->dtd_multo = 0;
711
712 /* set the active bit of status field to 1 */
713 dtd->dtd_status = DTD_STS_ACTIVE;
714 dev_vdbg(&dev->pdev->dev, "dtd->dtd_status = 0x%02x\n",
715 dtd->dtd_status);
716
717 dev_vdbg(&dev->pdev->dev, "length = %d, dma addr= 0x%08x\n",
718 *length, (int)*dma);
719 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
720 return dtd;
721 }
722
723
724 /* generate dTD linked list for a request */
725 static int req_to_dtd(struct langwell_request *req)
726 {
727 unsigned count;
728 int is_last, is_first = 1;
729 struct langwell_dtd *dtd, *last_dtd = NULL;
730 struct langwell_udc *dev;
731 dma_addr_t dma;
732
733 dev = req->ep->dev;
734 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
735 do {
736 dtd = build_dtd(req, &count, &dma, &is_last);
737 if (dtd == NULL)
738 return -ENOMEM;
739
740 if (is_first) {
741 is_first = 0;
742 req->head = dtd;
743 } else {
744 last_dtd->dtd_next = cpu_to_le32(dma);
745 last_dtd->next_dtd_virt = dtd;
746 }
747 last_dtd = dtd;
748 req->dtd_count++;
749 } while (!is_last);
750
751 /* set terminate bit to 1 for the last dTD */
752 dtd->dtd_next = DTD_TERM;
753
754 req->tail = dtd;
755
756 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
757 return 0;
758 }
759
760 /*-------------------------------------------------------------------------*/
761
762 /* queue (submits) an I/O requests to an endpoint */
763 static int langwell_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
764 gfp_t gfp_flags)
765 {
766 struct langwell_request *req;
767 struct langwell_ep *ep;
768 struct langwell_udc *dev;
769 unsigned long flags;
770 int is_iso = 0, zlflag = 0;
771
772 /* always require a cpu-view buffer */
773 req = container_of(_req, struct langwell_request, req);
774 ep = container_of(_ep, struct langwell_ep, ep);
775
776 if (!_req || !_req->complete || !_req->buf
777 || !list_empty(&req->queue)) {
778 return -EINVAL;
779 }
780
781 if (unlikely(!_ep || !ep->desc))
782 return -EINVAL;
783
784 dev = ep->dev;
785 req->ep = ep;
786 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
787
788 if (usb_endpoint_xfer_isoc(ep->desc)) {
789 if (req->req.length > ep->ep.maxpacket)
790 return -EMSGSIZE;
791 is_iso = 1;
792 }
793
794 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
795 return -ESHUTDOWN;
796
797 /* set up dma mapping in case the caller didn't */
798 if (_req->dma == DMA_ADDR_INVALID) {
799 /* WORKAROUND: WARN_ON(size == 0) */
800 if (_req->length == 0) {
801 dev_vdbg(&dev->pdev->dev, "req->length: 0->1\n");
802 zlflag = 1;
803 _req->length++;
804 }
805
806 _req->dma = dma_map_single(&dev->pdev->dev,
807 _req->buf, _req->length,
808 is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
809 if (zlflag && (_req->length == 1)) {
810 dev_vdbg(&dev->pdev->dev, "req->length: 1->0\n");
811 zlflag = 0;
812 _req->length = 0;
813 }
814
815 req->mapped = 1;
816 dev_vdbg(&dev->pdev->dev, "req->mapped = 1\n");
817 } else {
818 dma_sync_single_for_device(&dev->pdev->dev,
819 _req->dma, _req->length,
820 is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
821 req->mapped = 0;
822 dev_vdbg(&dev->pdev->dev, "req->mapped = 0\n");
823 }
824
825 dev_dbg(&dev->pdev->dev,
826 "%s queue req %p, len %u, buf %p, dma 0x%08x\n",
827 _ep->name,
828 _req, _req->length, _req->buf, (int)_req->dma);
829
830 _req->status = -EINPROGRESS;
831 _req->actual = 0;
832 req->dtd_count = 0;
833
834 spin_lock_irqsave(&dev->lock, flags);
835
836 /* build and put dTDs to endpoint queue */
837 if (!req_to_dtd(req)) {
838 queue_dtd(ep, req);
839 } else {
840 spin_unlock_irqrestore(&dev->lock, flags);
841 return -ENOMEM;
842 }
843
844 /* update ep0 state */
845 if (ep->ep_num == 0)
846 dev->ep0_state = DATA_STATE_XMIT;
847
848 if (likely(req != NULL)) {
849 list_add_tail(&req->queue, &ep->queue);
850 dev_vdbg(&dev->pdev->dev, "list_add_tail()\n");
851 }
852
853 spin_unlock_irqrestore(&dev->lock, flags);
854
855 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
856 return 0;
857 }
858
859
860 /* dequeue (cancels, unlinks) an I/O request from an endpoint */
861 static int langwell_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
862 {
863 struct langwell_ep *ep;
864 struct langwell_udc *dev;
865 struct langwell_request *req;
866 unsigned long flags;
867 int stopped, ep_num, retval = 0;
868 u32 endptctrl;
869
870 ep = container_of(_ep, struct langwell_ep, ep);
871 dev = ep->dev;
872 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
873
874 if (!_ep || !ep->desc || !_req)
875 return -EINVAL;
876
877 if (!dev->driver)
878 return -ESHUTDOWN;
879
880 spin_lock_irqsave(&dev->lock, flags);
881 stopped = ep->stopped;
882
883 /* quiesce dma while we patch the queue */
884 ep->stopped = 1;
885 ep_num = ep->ep_num;
886
887 /* disable endpoint control register */
888 endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
889 if (is_in(ep))
890 endptctrl &= ~EPCTRL_TXE;
891 else
892 endptctrl &= ~EPCTRL_RXE;
893 writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
894
895 /* make sure it's still queued on this endpoint */
896 list_for_each_entry(req, &ep->queue, queue) {
897 if (&req->req == _req)
898 break;
899 }
900
901 if (&req->req != _req) {
902 retval = -EINVAL;
903 goto done;
904 }
905
906 /* queue head may be partially complete. */
907 if (ep->queue.next == &req->queue) {
908 dev_dbg(&dev->pdev->dev, "unlink (%s) dma\n", _ep->name);
909 _req->status = -ECONNRESET;
910 langwell_ep_fifo_flush(&ep->ep);
911
912 /* not the last request in endpoint queue */
913 if (likely(ep->queue.next == &req->queue)) {
914 struct langwell_dqh *dqh;
915 struct langwell_request *next_req;
916
917 dqh = ep->dqh;
918 next_req = list_entry(req->queue.next,
919 struct langwell_request, queue);
920
921 /* point the dQH to the first dTD of next request */
922 writel((u32) next_req->head, &dqh->dqh_current);
923 }
924 } else {
925 struct langwell_request *prev_req;
926
927 prev_req = list_entry(req->queue.prev,
928 struct langwell_request, queue);
929 writel(readl(&req->tail->dtd_next),
930 &prev_req->tail->dtd_next);
931 }
932
933 done(ep, req, -ECONNRESET);
934
935 done:
936 /* enable endpoint again */
937 endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
938 if (is_in(ep))
939 endptctrl |= EPCTRL_TXE;
940 else
941 endptctrl |= EPCTRL_RXE;
942 writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
943
944 ep->stopped = stopped;
945 spin_unlock_irqrestore(&dev->lock, flags);
946
947 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
948 return retval;
949 }
950
951
952 /*-------------------------------------------------------------------------*/
953
954 /* endpoint set/clear halt */
955 static void ep_set_halt(struct langwell_ep *ep, int value)
956 {
957 u32 endptctrl = 0;
958 int ep_num;
959 struct langwell_udc *dev = ep->dev;
960 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
961
962 ep_num = ep->ep_num;
963 endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
964
965 /* value: 1 - set halt, 0 - clear halt */
966 if (value) {
967 /* set the stall bit */
968 if (is_in(ep))
969 endptctrl |= EPCTRL_TXS;
970 else
971 endptctrl |= EPCTRL_RXS;
972 } else {
973 /* clear the stall bit and reset data toggle */
974 if (is_in(ep)) {
975 endptctrl &= ~EPCTRL_TXS;
976 endptctrl |= EPCTRL_TXR;
977 } else {
978 endptctrl &= ~EPCTRL_RXS;
979 endptctrl |= EPCTRL_RXR;
980 }
981 }
982
983 writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
984
985 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
986 }
987
988
989 /* set the endpoint halt feature */
990 static int langwell_ep_set_halt(struct usb_ep *_ep, int value)
991 {
992 struct langwell_ep *ep;
993 struct langwell_udc *dev;
994 unsigned long flags;
995 int retval = 0;
996
997 ep = container_of(_ep, struct langwell_ep, ep);
998 dev = ep->dev;
999
1000 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1001
1002 if (!_ep || !ep->desc)
1003 return -EINVAL;
1004
1005 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
1006 return -ESHUTDOWN;
1007
1008 if (usb_endpoint_xfer_isoc(ep->desc))
1009 return -EOPNOTSUPP;
1010
1011 spin_lock_irqsave(&dev->lock, flags);
1012
1013 /*
1014 * attempt to halt IN ep will fail if any transfer requests
1015 * are still queue
1016 */
1017 if (!list_empty(&ep->queue) && is_in(ep) && value) {
1018 /* IN endpoint FIFO holds bytes */
1019 dev_dbg(&dev->pdev->dev, "%s FIFO holds bytes\n", _ep->name);
1020 retval = -EAGAIN;
1021 goto done;
1022 }
1023
1024 /* endpoint set/clear halt */
1025 if (ep->ep_num) {
1026 ep_set_halt(ep, value);
1027 } else { /* endpoint 0 */
1028 dev->ep0_state = WAIT_FOR_SETUP;
1029 dev->ep0_dir = USB_DIR_OUT;
1030 }
1031 done:
1032 spin_unlock_irqrestore(&dev->lock, flags);
1033 dev_dbg(&dev->pdev->dev, "%s %s halt\n",
1034 _ep->name, value ? "set" : "clear");
1035 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1036 return retval;
1037 }
1038
1039
1040 /* set the halt feature and ignores clear requests */
1041 static int langwell_ep_set_wedge(struct usb_ep *_ep)
1042 {
1043 struct langwell_ep *ep;
1044 struct langwell_udc *dev;
1045
1046 ep = container_of(_ep, struct langwell_ep, ep);
1047 dev = ep->dev;
1048
1049 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1050
1051 if (!_ep || !ep->desc)
1052 return -EINVAL;
1053
1054 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1055 return usb_ep_set_halt(_ep);
1056 }
1057
1058
1059 /* flush contents of a fifo */
1060 static void langwell_ep_fifo_flush(struct usb_ep *_ep)
1061 {
1062 struct langwell_ep *ep;
1063 struct langwell_udc *dev;
1064 u32 flush_bit;
1065 unsigned long timeout;
1066
1067 ep = container_of(_ep, struct langwell_ep, ep);
1068 dev = ep->dev;
1069
1070 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1071
1072 if (!_ep || !ep->desc) {
1073 dev_vdbg(&dev->pdev->dev, "ep or ep->desc is NULL\n");
1074 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1075 return;
1076 }
1077
1078 dev_vdbg(&dev->pdev->dev, "%s-%s fifo flush\n",
1079 _ep->name, DIR_STRING(ep));
1080
1081 /* flush endpoint buffer */
1082 if (ep->ep_num == 0)
1083 flush_bit = (1 << 16) | 1;
1084 else if (is_in(ep))
1085 flush_bit = 1 << (ep->ep_num + 16); /* TX */
1086 else
1087 flush_bit = 1 << ep->ep_num; /* RX */
1088
1089 /* wait until flush complete */
1090 timeout = jiffies + FLUSH_TIMEOUT;
1091 do {
1092 writel(flush_bit, &dev->op_regs->endptflush);
1093 while (readl(&dev->op_regs->endptflush)) {
1094 if (time_after(jiffies, timeout)) {
1095 dev_err(&dev->pdev->dev, "ep flush timeout\n");
1096 goto done;
1097 }
1098 cpu_relax();
1099 }
1100 } while (readl(&dev->op_regs->endptstat) & flush_bit);
1101 done:
1102 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1103 }
1104
1105
1106 /* endpoints operations structure */
1107 static const struct usb_ep_ops langwell_ep_ops = {
1108
1109 /* configure endpoint, making it usable */
1110 .enable = langwell_ep_enable,
1111
1112 /* endpoint is no longer usable */
1113 .disable = langwell_ep_disable,
1114
1115 /* allocate a request object to use with this endpoint */
1116 .alloc_request = langwell_alloc_request,
1117
1118 /* free a request object */
1119 .free_request = langwell_free_request,
1120
1121 /* queue (submits) an I/O requests to an endpoint */
1122 .queue = langwell_ep_queue,
1123
1124 /* dequeue (cancels, unlinks) an I/O request from an endpoint */
1125 .dequeue = langwell_ep_dequeue,
1126
1127 /* set the endpoint halt feature */
1128 .set_halt = langwell_ep_set_halt,
1129
1130 /* set the halt feature and ignores clear requests */
1131 .set_wedge = langwell_ep_set_wedge,
1132
1133 /* flush contents of a fifo */
1134 .fifo_flush = langwell_ep_fifo_flush,
1135 };
1136
1137
1138 /*-------------------------------------------------------------------------*/
1139
1140 /* device controller usb_gadget_ops structure */
1141
1142 /* returns the current frame number */
1143 static int langwell_get_frame(struct usb_gadget *_gadget)
1144 {
1145 struct langwell_udc *dev;
1146 u16 retval;
1147
1148 if (!_gadget)
1149 return -ENODEV;
1150
1151 dev = container_of(_gadget, struct langwell_udc, gadget);
1152 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1153
1154 retval = readl(&dev->op_regs->frindex) & FRINDEX_MASK;
1155
1156 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1157 return retval;
1158 }
1159
1160
1161 /* enter or exit PHY low power state */
1162 static void langwell_phy_low_power(struct langwell_udc *dev, bool flag)
1163 {
1164 u32 devlc;
1165 u8 devlc_byte2;
1166 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
1167
1168 devlc = readl(&dev->op_regs->devlc);
1169 dev_vdbg(&dev->pdev->dev, "devlc = 0x%08x\n", devlc);
1170
1171 if (flag)
1172 devlc |= LPM_PHCD;
1173 else
1174 devlc &= ~LPM_PHCD;
1175
1176 /* FIXME: workaround for Langwell A1/A2/A3 sighting */
1177 devlc_byte2 = (devlc >> 16) & 0xff;
1178 writeb(devlc_byte2, (u8 *)&dev->op_regs->devlc + 2);
1179
1180 devlc = readl(&dev->op_regs->devlc);
1181 dev_vdbg(&dev->pdev->dev,
1182 "%s PHY low power suspend, devlc = 0x%08x\n",
1183 flag ? "enter" : "exit", devlc);
1184 }
1185
1186
1187 /* tries to wake up the host connected to this gadget */
1188 static int langwell_wakeup(struct usb_gadget *_gadget)
1189 {
1190 struct langwell_udc *dev;
1191 u32 portsc1;
1192 unsigned long flags;
1193
1194 if (!_gadget)
1195 return 0;
1196
1197 dev = container_of(_gadget, struct langwell_udc, gadget);
1198 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1199
1200 /* remote wakeup feature not enabled by host */
1201 if (!dev->remote_wakeup) {
1202 dev_info(&dev->pdev->dev, "remote wakeup is disabled\n");
1203 return -ENOTSUPP;
1204 }
1205
1206 spin_lock_irqsave(&dev->lock, flags);
1207
1208 portsc1 = readl(&dev->op_regs->portsc1);
1209 if (!(portsc1 & PORTS_SUSP)) {
1210 spin_unlock_irqrestore(&dev->lock, flags);
1211 return 0;
1212 }
1213
1214 /* LPM L1 to L0 or legacy remote wakeup */
1215 if (dev->lpm && dev->lpm_state == LPM_L1)
1216 dev_info(&dev->pdev->dev, "LPM L1 to L0 remote wakeup\n");
1217 else
1218 dev_info(&dev->pdev->dev, "device remote wakeup\n");
1219
1220 /* exit PHY low power suspend */
1221 if (dev->pdev->device != 0x0829)
1222 langwell_phy_low_power(dev, 0);
1223
1224 /* force port resume */
1225 portsc1 |= PORTS_FPR;
1226 writel(portsc1, &dev->op_regs->portsc1);
1227
1228 spin_unlock_irqrestore(&dev->lock, flags);
1229
1230 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1231 return 0;
1232 }
1233
1234
1235 /* notify controller that VBUS is powered or not */
1236 static int langwell_vbus_session(struct usb_gadget *_gadget, int is_active)
1237 {
1238 struct langwell_udc *dev;
1239 unsigned long flags;
1240 u32 usbcmd;
1241
1242 if (!_gadget)
1243 return -ENODEV;
1244
1245 dev = container_of(_gadget, struct langwell_udc, gadget);
1246 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1247
1248 spin_lock_irqsave(&dev->lock, flags);
1249 dev_vdbg(&dev->pdev->dev, "VBUS status: %s\n",
1250 is_active ? "on" : "off");
1251
1252 dev->vbus_active = (is_active != 0);
1253 if (dev->driver && dev->softconnected && dev->vbus_active) {
1254 usbcmd = readl(&dev->op_regs->usbcmd);
1255 usbcmd |= CMD_RUNSTOP;
1256 writel(usbcmd, &dev->op_regs->usbcmd);
1257 } else {
1258 usbcmd = readl(&dev->op_regs->usbcmd);
1259 usbcmd &= ~CMD_RUNSTOP;
1260 writel(usbcmd, &dev->op_regs->usbcmd);
1261 }
1262
1263 spin_unlock_irqrestore(&dev->lock, flags);
1264
1265 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1266 return 0;
1267 }
1268
1269
1270 /* constrain controller's VBUS power usage */
1271 static int langwell_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1272 {
1273 struct langwell_udc *dev;
1274
1275 if (!_gadget)
1276 return -ENODEV;
1277
1278 dev = container_of(_gadget, struct langwell_udc, gadget);
1279 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1280
1281 if (dev->transceiver) {
1282 dev_vdbg(&dev->pdev->dev, "otg_set_power\n");
1283 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1284 return otg_set_power(dev->transceiver, mA);
1285 }
1286
1287 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1288 return -ENOTSUPP;
1289 }
1290
1291
1292 /* D+ pullup, software-controlled connect/disconnect to USB host */
1293 static int langwell_pullup(struct usb_gadget *_gadget, int is_on)
1294 {
1295 struct langwell_udc *dev;
1296 u32 usbcmd;
1297 unsigned long flags;
1298
1299 if (!_gadget)
1300 return -ENODEV;
1301
1302 dev = container_of(_gadget, struct langwell_udc, gadget);
1303
1304 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1305
1306 spin_lock_irqsave(&dev->lock, flags);
1307 dev->softconnected = (is_on != 0);
1308
1309 if (dev->driver && dev->softconnected && dev->vbus_active) {
1310 usbcmd = readl(&dev->op_regs->usbcmd);
1311 usbcmd |= CMD_RUNSTOP;
1312 writel(usbcmd, &dev->op_regs->usbcmd);
1313 } else {
1314 usbcmd = readl(&dev->op_regs->usbcmd);
1315 usbcmd &= ~CMD_RUNSTOP;
1316 writel(usbcmd, &dev->op_regs->usbcmd);
1317 }
1318 spin_unlock_irqrestore(&dev->lock, flags);
1319
1320 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1321 return 0;
1322 }
1323
1324
1325 /* device controller usb_gadget_ops structure */
1326 static const struct usb_gadget_ops langwell_ops = {
1327
1328 /* returns the current frame number */
1329 .get_frame = langwell_get_frame,
1330
1331 /* tries to wake up the host connected to this gadget */
1332 .wakeup = langwell_wakeup,
1333
1334 /* set the device selfpowered feature, always selfpowered */
1335 /* .set_selfpowered = langwell_set_selfpowered, */
1336
1337 /* notify controller that VBUS is powered or not */
1338 .vbus_session = langwell_vbus_session,
1339
1340 /* constrain controller's VBUS power usage */
1341 .vbus_draw = langwell_vbus_draw,
1342
1343 /* D+ pullup, software-controlled connect/disconnect to USB host */
1344 .pullup = langwell_pullup,
1345 };
1346
1347
1348 /*-------------------------------------------------------------------------*/
1349
1350 /* device controller operations */
1351
1352 /* reset device controller */
1353 static int langwell_udc_reset(struct langwell_udc *dev)
1354 {
1355 u32 usbcmd, usbmode, devlc, endpointlistaddr;
1356 u8 devlc_byte0, devlc_byte2;
1357 unsigned long timeout;
1358
1359 if (!dev)
1360 return -EINVAL;
1361
1362 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
1363
1364 /* set controller to stop state */
1365 usbcmd = readl(&dev->op_regs->usbcmd);
1366 usbcmd &= ~CMD_RUNSTOP;
1367 writel(usbcmd, &dev->op_regs->usbcmd);
1368
1369 /* reset device controller */
1370 usbcmd = readl(&dev->op_regs->usbcmd);
1371 usbcmd |= CMD_RST;
1372 writel(usbcmd, &dev->op_regs->usbcmd);
1373
1374 /* wait for reset to complete */
1375 timeout = jiffies + RESET_TIMEOUT;
1376 while (readl(&dev->op_regs->usbcmd) & CMD_RST) {
1377 if (time_after(jiffies, timeout)) {
1378 dev_err(&dev->pdev->dev, "device reset timeout\n");
1379 return -ETIMEDOUT;
1380 }
1381 cpu_relax();
1382 }
1383
1384 /* set controller to device mode */
1385 usbmode = readl(&dev->op_regs->usbmode);
1386 usbmode |= MODE_DEVICE;
1387
1388 /* turn setup lockout off, require setup tripwire in usbcmd */
1389 usbmode |= MODE_SLOM;
1390
1391 writel(usbmode, &dev->op_regs->usbmode);
1392 usbmode = readl(&dev->op_regs->usbmode);
1393 dev_vdbg(&dev->pdev->dev, "usbmode=0x%08x\n", usbmode);
1394
1395 /* Write-Clear setup status */
1396 writel(0, &dev->op_regs->usbsts);
1397
1398 /* if support USB LPM, ACK all LPM token */
1399 if (dev->lpm) {
1400 devlc = readl(&dev->op_regs->devlc);
1401 dev_vdbg(&dev->pdev->dev, "devlc = 0x%08x\n", devlc);
1402 /* FIXME: workaround for Langwell A1/A2/A3 sighting */
1403 devlc &= ~LPM_STL; /* don't STALL LPM token */
1404 devlc &= ~LPM_NYT_ACK; /* ACK LPM token */
1405 devlc_byte0 = devlc & 0xff;
1406 devlc_byte2 = (devlc >> 16) & 0xff;
1407 writeb(devlc_byte0, (u8 *)&dev->op_regs->devlc);
1408 writeb(devlc_byte2, (u8 *)&dev->op_regs->devlc + 2);
1409 devlc = readl(&dev->op_regs->devlc);
1410 dev_vdbg(&dev->pdev->dev,
1411 "ACK LPM token, devlc = 0x%08x\n", devlc);
1412 }
1413
1414 /* fill endpointlistaddr register */
1415 endpointlistaddr = dev->ep_dqh_dma;
1416 endpointlistaddr &= ENDPOINTLISTADDR_MASK;
1417 writel(endpointlistaddr, &dev->op_regs->endpointlistaddr);
1418
1419 dev_vdbg(&dev->pdev->dev,
1420 "dQH base (vir: %p, phy: 0x%08x), endpointlistaddr=0x%08x\n",
1421 dev->ep_dqh, endpointlistaddr,
1422 readl(&dev->op_regs->endpointlistaddr));
1423 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1424 return 0;
1425 }
1426
1427
1428 /* reinitialize device controller endpoints */
1429 static int eps_reinit(struct langwell_udc *dev)
1430 {
1431 struct langwell_ep *ep;
1432 char name[14];
1433 int i;
1434
1435 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1436
1437 /* initialize ep0 */
1438 ep = &dev->ep[0];
1439 ep->dev = dev;
1440 strncpy(ep->name, "ep0", sizeof(ep->name));
1441 ep->ep.name = ep->name;
1442 ep->ep.ops = &langwell_ep_ops;
1443 ep->stopped = 0;
1444 ep->ep.maxpacket = EP0_MAX_PKT_SIZE;
1445 ep->ep_num = 0;
1446 ep->desc = &langwell_ep0_desc;
1447 INIT_LIST_HEAD(&ep->queue);
1448
1449 ep->ep_type = USB_ENDPOINT_XFER_CONTROL;
1450
1451 /* initialize other endpoints */
1452 for (i = 2; i < dev->ep_max; i++) {
1453 ep = &dev->ep[i];
1454 if (i % 2)
1455 snprintf(name, sizeof(name), "ep%din", i / 2);
1456 else
1457 snprintf(name, sizeof(name), "ep%dout", i / 2);
1458 ep->dev = dev;
1459 strncpy(ep->name, name, sizeof(ep->name));
1460 ep->ep.name = ep->name;
1461
1462 ep->ep.ops = &langwell_ep_ops;
1463 ep->stopped = 0;
1464 ep->ep.maxpacket = (unsigned short) ~0;
1465 ep->ep_num = i / 2;
1466
1467 INIT_LIST_HEAD(&ep->queue);
1468 list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
1469 }
1470
1471 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1472 return 0;
1473 }
1474
1475
1476 /* enable interrupt and set controller to run state */
1477 static void langwell_udc_start(struct langwell_udc *dev)
1478 {
1479 u32 usbintr, usbcmd;
1480 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
1481
1482 /* enable interrupts */
1483 usbintr = INTR_ULPIE /* ULPI */
1484 | INTR_SLE /* suspend */
1485 /* | INTR_SRE SOF received */
1486 | INTR_URE /* USB reset */
1487 | INTR_AAE /* async advance */
1488 | INTR_SEE /* system error */
1489 | INTR_FRE /* frame list rollover */
1490 | INTR_PCE /* port change detect */
1491 | INTR_UEE /* USB error interrupt */
1492 | INTR_UE; /* USB interrupt */
1493 writel(usbintr, &dev->op_regs->usbintr);
1494
1495 /* clear stopped bit */
1496 dev->stopped = 0;
1497
1498 /* set controller to run */
1499 usbcmd = readl(&dev->op_regs->usbcmd);
1500 usbcmd |= CMD_RUNSTOP;
1501 writel(usbcmd, &dev->op_regs->usbcmd);
1502
1503 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1504 }
1505
1506
1507 /* disable interrupt and set controller to stop state */
1508 static void langwell_udc_stop(struct langwell_udc *dev)
1509 {
1510 u32 usbcmd;
1511
1512 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
1513
1514 /* disable all interrupts */
1515 writel(0, &dev->op_regs->usbintr);
1516
1517 /* set stopped bit */
1518 dev->stopped = 1;
1519
1520 /* set controller to stop state */
1521 usbcmd = readl(&dev->op_regs->usbcmd);
1522 usbcmd &= ~CMD_RUNSTOP;
1523 writel(usbcmd, &dev->op_regs->usbcmd);
1524
1525 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1526 }
1527
1528
1529 /* stop all USB activities */
1530 static void stop_activity(struct langwell_udc *dev,
1531 struct usb_gadget_driver *driver)
1532 {
1533 struct langwell_ep *ep;
1534 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
1535
1536 nuke(&dev->ep[0], -ESHUTDOWN);
1537
1538 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
1539 nuke(ep, -ESHUTDOWN);
1540 }
1541
1542 /* report disconnect; the driver is already quiesced */
1543 if (driver) {
1544 spin_unlock(&dev->lock);
1545 driver->disconnect(&dev->gadget);
1546 spin_lock(&dev->lock);
1547 }
1548
1549 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1550 }
1551
1552
1553 /*-------------------------------------------------------------------------*/
1554
1555 /* device "function" sysfs attribute file */
1556 static ssize_t show_function(struct device *_dev,
1557 struct device_attribute *attr, char *buf)
1558 {
1559 struct langwell_udc *dev = the_controller;
1560
1561 if (!dev->driver || !dev->driver->function
1562 || strlen(dev->driver->function) > PAGE_SIZE)
1563 return 0;
1564
1565 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1566 }
1567 static DEVICE_ATTR(function, S_IRUGO, show_function, NULL);
1568
1569
1570 /* device "langwell_udc" sysfs attribute file */
1571 static ssize_t show_langwell_udc(struct device *_dev,
1572 struct device_attribute *attr, char *buf)
1573 {
1574 struct langwell_udc *dev = the_controller;
1575 struct langwell_request *req;
1576 struct langwell_ep *ep = NULL;
1577 char *next;
1578 unsigned size;
1579 unsigned t;
1580 unsigned i;
1581 unsigned long flags;
1582 u32 tmp_reg;
1583
1584 next = buf;
1585 size = PAGE_SIZE;
1586 spin_lock_irqsave(&dev->lock, flags);
1587
1588 /* driver basic information */
1589 t = scnprintf(next, size,
1590 DRIVER_DESC "\n"
1591 "%s version: %s\n"
1592 "Gadget driver: %s\n\n",
1593 driver_name, DRIVER_VERSION,
1594 dev->driver ? dev->driver->driver.name : "(none)");
1595 size -= t;
1596 next += t;
1597
1598 /* device registers */
1599 tmp_reg = readl(&dev->op_regs->usbcmd);
1600 t = scnprintf(next, size,
1601 "USBCMD reg:\n"
1602 "SetupTW: %d\n"
1603 "Run/Stop: %s\n\n",
1604 (tmp_reg & CMD_SUTW) ? 1 : 0,
1605 (tmp_reg & CMD_RUNSTOP) ? "Run" : "Stop");
1606 size -= t;
1607 next += t;
1608
1609 tmp_reg = readl(&dev->op_regs->usbsts);
1610 t = scnprintf(next, size,
1611 "USB Status Reg:\n"
1612 "Device Suspend: %d\n"
1613 "Reset Received: %d\n"
1614 "System Error: %s\n"
1615 "USB Error Interrupt: %s\n\n",
1616 (tmp_reg & STS_SLI) ? 1 : 0,
1617 (tmp_reg & STS_URI) ? 1 : 0,
1618 (tmp_reg & STS_SEI) ? "Error" : "No error",
1619 (tmp_reg & STS_UEI) ? "Error detected" : "No error");
1620 size -= t;
1621 next += t;
1622
1623 tmp_reg = readl(&dev->op_regs->usbintr);
1624 t = scnprintf(next, size,
1625 "USB Intrrupt Enable Reg:\n"
1626 "Sleep Enable: %d\n"
1627 "SOF Received Enable: %d\n"
1628 "Reset Enable: %d\n"
1629 "System Error Enable: %d\n"
1630 "Port Change Dectected Enable: %d\n"
1631 "USB Error Intr Enable: %d\n"
1632 "USB Intr Enable: %d\n\n",
1633 (tmp_reg & INTR_SLE) ? 1 : 0,
1634 (tmp_reg & INTR_SRE) ? 1 : 0,
1635 (tmp_reg & INTR_URE) ? 1 : 0,
1636 (tmp_reg & INTR_SEE) ? 1 : 0,
1637 (tmp_reg & INTR_PCE) ? 1 : 0,
1638 (tmp_reg & INTR_UEE) ? 1 : 0,
1639 (tmp_reg & INTR_UE) ? 1 : 0);
1640 size -= t;
1641 next += t;
1642
1643 tmp_reg = readl(&dev->op_regs->frindex);
1644 t = scnprintf(next, size,
1645 "USB Frame Index Reg:\n"
1646 "Frame Number is 0x%08x\n\n",
1647 (tmp_reg & FRINDEX_MASK));
1648 size -= t;
1649 next += t;
1650
1651 tmp_reg = readl(&dev->op_regs->deviceaddr);
1652 t = scnprintf(next, size,
1653 "USB Device Address Reg:\n"
1654 "Device Addr is 0x%x\n\n",
1655 USBADR(tmp_reg));
1656 size -= t;
1657 next += t;
1658
1659 tmp_reg = readl(&dev->op_regs->endpointlistaddr);
1660 t = scnprintf(next, size,
1661 "USB Endpoint List Address Reg:\n"
1662 "Endpoint List Pointer is 0x%x\n\n",
1663 EPBASE(tmp_reg));
1664 size -= t;
1665 next += t;
1666
1667 tmp_reg = readl(&dev->op_regs->portsc1);
1668 t = scnprintf(next, size,
1669 "USB Port Status & Control Reg:\n"
1670 "Port Reset: %s\n"
1671 "Port Suspend Mode: %s\n"
1672 "Over-current Change: %s\n"
1673 "Port Enable/Disable Change: %s\n"
1674 "Port Enabled/Disabled: %s\n"
1675 "Current Connect Status: %s\n"
1676 "LPM Suspend Status: %s\n\n",
1677 (tmp_reg & PORTS_PR) ? "Reset" : "Not Reset",
1678 (tmp_reg & PORTS_SUSP) ? "Suspend " : "Not Suspend",
1679 (tmp_reg & PORTS_OCC) ? "Detected" : "No",
1680 (tmp_reg & PORTS_PEC) ? "Changed" : "Not Changed",
1681 (tmp_reg & PORTS_PE) ? "Enable" : "Not Correct",
1682 (tmp_reg & PORTS_CCS) ? "Attached" : "Not Attached",
1683 (tmp_reg & PORTS_SLP) ? "LPM L1" : "LPM L0");
1684 size -= t;
1685 next += t;
1686
1687 tmp_reg = readl(&dev->op_regs->devlc);
1688 t = scnprintf(next, size,
1689 "Device LPM Control Reg:\n"
1690 "Parallel Transceiver : %d\n"
1691 "Serial Transceiver : %d\n"
1692 "Port Speed: %s\n"
1693 "Port Force Full Speed Connenct: %s\n"
1694 "PHY Low Power Suspend Clock: %s\n"
1695 "BmAttributes: %d\n\n",
1696 LPM_PTS(tmp_reg),
1697 (tmp_reg & LPM_STS) ? 1 : 0,
1698 ({
1699 char *s;
1700 switch (LPM_PSPD(tmp_reg)) {
1701 case LPM_SPEED_FULL:
1702 s = "Full Speed"; break;
1703 case LPM_SPEED_LOW:
1704 s = "Low Speed"; break;
1705 case LPM_SPEED_HIGH:
1706 s = "High Speed"; break;
1707 default:
1708 s = "Unknown Speed"; break;
1709 }
1710 s;
1711 }),
1712 (tmp_reg & LPM_PFSC) ? "Force Full Speed" : "Not Force",
1713 (tmp_reg & LPM_PHCD) ? "Disabled" : "Enabled",
1714 LPM_BA(tmp_reg));
1715 size -= t;
1716 next += t;
1717
1718 tmp_reg = readl(&dev->op_regs->usbmode);
1719 t = scnprintf(next, size,
1720 "USB Mode Reg:\n"
1721 "Controller Mode is : %s\n\n", ({
1722 char *s;
1723 switch (MODE_CM(tmp_reg)) {
1724 case MODE_IDLE:
1725 s = "Idle"; break;
1726 case MODE_DEVICE:
1727 s = "Device Controller"; break;
1728 case MODE_HOST:
1729 s = "Host Controller"; break;
1730 default:
1731 s = "None"; break;
1732 }
1733 s;
1734 }));
1735 size -= t;
1736 next += t;
1737
1738 tmp_reg = readl(&dev->op_regs->endptsetupstat);
1739 t = scnprintf(next, size,
1740 "Endpoint Setup Status Reg:\n"
1741 "SETUP on ep 0x%04x\n\n",
1742 tmp_reg & SETUPSTAT_MASK);
1743 size -= t;
1744 next += t;
1745
1746 for (i = 0; i < dev->ep_max / 2; i++) {
1747 tmp_reg = readl(&dev->op_regs->endptctrl[i]);
1748 t = scnprintf(next, size, "EP Ctrl Reg [%d]: 0x%08x\n",
1749 i, tmp_reg);
1750 size -= t;
1751 next += t;
1752 }
1753 tmp_reg = readl(&dev->op_regs->endptprime);
1754 t = scnprintf(next, size, "EP Prime Reg: 0x%08x\n\n", tmp_reg);
1755 size -= t;
1756 next += t;
1757
1758 /* langwell_udc, langwell_ep, langwell_request structure information */
1759 ep = &dev->ep[0];
1760 t = scnprintf(next, size, "%s MaxPacketSize: 0x%x, ep_num: %d\n",
1761 ep->ep.name, ep->ep.maxpacket, ep->ep_num);
1762 size -= t;
1763 next += t;
1764
1765 if (list_empty(&ep->queue)) {
1766 t = scnprintf(next, size, "its req queue is empty\n\n");
1767 size -= t;
1768 next += t;
1769 } else {
1770 list_for_each_entry(req, &ep->queue, queue) {
1771 t = scnprintf(next, size,
1772 "req %p actual 0x%x length 0x%x buf %p\n",
1773 &req->req, req->req.actual,
1774 req->req.length, req->req.buf);
1775 size -= t;
1776 next += t;
1777 }
1778 }
1779 /* other gadget->eplist ep */
1780 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
1781 if (ep->desc) {
1782 t = scnprintf(next, size,
1783 "\n%s MaxPacketSize: 0x%x, "
1784 "ep_num: %d\n",
1785 ep->ep.name, ep->ep.maxpacket,
1786 ep->ep_num);
1787 size -= t;
1788 next += t;
1789
1790 if (list_empty(&ep->queue)) {
1791 t = scnprintf(next, size,
1792 "its req queue is empty\n\n");
1793 size -= t;
1794 next += t;
1795 } else {
1796 list_for_each_entry(req, &ep->queue, queue) {
1797 t = scnprintf(next, size,
1798 "req %p actual 0x%x length "
1799 "0x%x buf %p\n",
1800 &req->req, req->req.actual,
1801 req->req.length, req->req.buf);
1802 size -= t;
1803 next += t;
1804 }
1805 }
1806 }
1807 }
1808
1809 spin_unlock_irqrestore(&dev->lock, flags);
1810 return PAGE_SIZE - size;
1811 }
1812 static DEVICE_ATTR(langwell_udc, S_IRUGO, show_langwell_udc, NULL);
1813
1814
1815 /* device "remote_wakeup" sysfs attribute file */
1816 static ssize_t store_remote_wakeup(struct device *_dev,
1817 struct device_attribute *attr, const char *buf, size_t count)
1818 {
1819 struct langwell_udc *dev = the_controller;
1820 unsigned long flags;
1821 ssize_t rc = count;
1822
1823 if (count > 2)
1824 return -EINVAL;
1825
1826 if (count > 0 && buf[count-1] == '\n')
1827 ((char *) buf)[count-1] = 0;
1828
1829 if (buf[0] != '1')
1830 return -EINVAL;
1831
1832 /* force remote wakeup enabled in case gadget driver doesn't support */
1833 spin_lock_irqsave(&dev->lock, flags);
1834 dev->remote_wakeup = 1;
1835 dev->dev_status |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1836 spin_unlock_irqrestore(&dev->lock, flags);
1837
1838 langwell_wakeup(&dev->gadget);
1839
1840 return rc;
1841 }
1842 static DEVICE_ATTR(remote_wakeup, S_IWUSR, NULL, store_remote_wakeup);
1843
1844
1845 /*-------------------------------------------------------------------------*/
1846
1847 /*
1848 * when a driver is successfully registered, it will receive
1849 * control requests including set_configuration(), which enables
1850 * non-control requests. then usb traffic follows until a
1851 * disconnect is reported. then a host may connect again, or
1852 * the driver might get unbound.
1853 */
1854
1855 int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
1856 int (*bind)(struct usb_gadget *))
1857 {
1858 struct langwell_udc *dev = the_controller;
1859 unsigned long flags;
1860 int retval;
1861
1862 if (!dev)
1863 return -ENODEV;
1864
1865 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
1866
1867 if (dev->driver)
1868 return -EBUSY;
1869
1870 spin_lock_irqsave(&dev->lock, flags);
1871
1872 /* hook up the driver ... */
1873 driver->driver.bus = NULL;
1874 dev->driver = driver;
1875 dev->gadget.dev.driver = &driver->driver;
1876
1877 spin_unlock_irqrestore(&dev->lock, flags);
1878
1879 retval = bind(&dev->gadget);
1880 if (retval) {
1881 dev_dbg(&dev->pdev->dev, "bind to driver %s --> %d\n",
1882 driver->driver.name, retval);
1883 dev->driver = NULL;
1884 dev->gadget.dev.driver = NULL;
1885 return retval;
1886 }
1887
1888 retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
1889 if (retval)
1890 goto err_unbind;
1891
1892 dev->usb_state = USB_STATE_ATTACHED;
1893 dev->ep0_state = WAIT_FOR_SETUP;
1894 dev->ep0_dir = USB_DIR_OUT;
1895
1896 /* enable interrupt and set controller to run state */
1897 if (dev->got_irq)
1898 langwell_udc_start(dev);
1899
1900 dev_vdbg(&dev->pdev->dev,
1901 "After langwell_udc_start(), print all registers:\n");
1902 print_all_registers(dev);
1903
1904 dev_info(&dev->pdev->dev, "register driver: %s\n",
1905 driver->driver.name);
1906 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1907 return 0;
1908
1909 err_unbind:
1910 driver->unbind(&dev->gadget);
1911 dev->gadget.dev.driver = NULL;
1912 dev->driver = NULL;
1913
1914 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1915 return retval;
1916 }
1917 EXPORT_SYMBOL(usb_gadget_probe_driver);
1918
1919
1920 /* unregister gadget driver */
1921 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1922 {
1923 struct langwell_udc *dev = the_controller;
1924 unsigned long flags;
1925
1926 if (!dev)
1927 return -ENODEV;
1928
1929 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
1930
1931 if (unlikely(!driver || !driver->unbind))
1932 return -EINVAL;
1933
1934 /* exit PHY low power suspend */
1935 if (dev->pdev->device != 0x0829)
1936 langwell_phy_low_power(dev, 0);
1937
1938 /* unbind OTG transceiver */
1939 if (dev->transceiver)
1940 (void)otg_set_peripheral(dev->transceiver, 0);
1941
1942 /* disable interrupt and set controller to stop state */
1943 langwell_udc_stop(dev);
1944
1945 dev->usb_state = USB_STATE_ATTACHED;
1946 dev->ep0_state = WAIT_FOR_SETUP;
1947 dev->ep0_dir = USB_DIR_OUT;
1948
1949 spin_lock_irqsave(&dev->lock, flags);
1950
1951 /* stop all usb activities */
1952 dev->gadget.speed = USB_SPEED_UNKNOWN;
1953 stop_activity(dev, driver);
1954 spin_unlock_irqrestore(&dev->lock, flags);
1955
1956 /* unbind gadget driver */
1957 driver->unbind(&dev->gadget);
1958 dev->gadget.dev.driver = NULL;
1959 dev->driver = NULL;
1960
1961 device_remove_file(&dev->pdev->dev, &dev_attr_function);
1962
1963 dev_info(&dev->pdev->dev, "unregistered driver '%s'\n",
1964 driver->driver.name);
1965 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
1966 return 0;
1967 }
1968 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1969
1970
1971 /*-------------------------------------------------------------------------*/
1972
1973 /*
1974 * setup tripwire is used as a semaphore to ensure that the setup data
1975 * payload is extracted from a dQH without being corrupted
1976 */
1977 static void setup_tripwire(struct langwell_udc *dev)
1978 {
1979 u32 usbcmd,
1980 endptsetupstat;
1981 unsigned long timeout;
1982 struct langwell_dqh *dqh;
1983
1984 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
1985
1986 /* ep0 OUT dQH */
1987 dqh = &dev->ep_dqh[EP_DIR_OUT];
1988
1989 /* Write-Clear endptsetupstat */
1990 endptsetupstat = readl(&dev->op_regs->endptsetupstat);
1991 writel(endptsetupstat, &dev->op_regs->endptsetupstat);
1992
1993 /* wait until endptsetupstat is cleared */
1994 timeout = jiffies + SETUPSTAT_TIMEOUT;
1995 while (readl(&dev->op_regs->endptsetupstat)) {
1996 if (time_after(jiffies, timeout)) {
1997 dev_err(&dev->pdev->dev, "setup_tripwire timeout\n");
1998 break;
1999 }
2000 cpu_relax();
2001 }
2002
2003 /* while a hazard exists when setup packet arrives */
2004 do {
2005 /* set setup tripwire bit */
2006 usbcmd = readl(&dev->op_regs->usbcmd);
2007 writel(usbcmd | CMD_SUTW, &dev->op_regs->usbcmd);
2008
2009 /* copy the setup packet to local buffer */
2010 memcpy(&dev->local_setup_buff, &dqh->dqh_setup, 8);
2011 } while (!(readl(&dev->op_regs->usbcmd) & CMD_SUTW));
2012
2013 /* Write-Clear setup tripwire bit */
2014 usbcmd = readl(&dev->op_regs->usbcmd);
2015 writel(usbcmd & ~CMD_SUTW, &dev->op_regs->usbcmd);
2016
2017 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2018 }
2019
2020
2021 /* protocol ep0 stall, will automatically be cleared on new transaction */
2022 static void ep0_stall(struct langwell_udc *dev)
2023 {
2024 u32 endptctrl;
2025
2026 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2027
2028 /* set TX and RX to stall */
2029 endptctrl = readl(&dev->op_regs->endptctrl[0]);
2030 endptctrl |= EPCTRL_TXS | EPCTRL_RXS;
2031 writel(endptctrl, &dev->op_regs->endptctrl[0]);
2032
2033 /* update ep0 state */
2034 dev->ep0_state = WAIT_FOR_SETUP;
2035 dev->ep0_dir = USB_DIR_OUT;
2036
2037 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2038 }
2039
2040
2041 /* PRIME a status phase for ep0 */
2042 static int prime_status_phase(struct langwell_udc *dev, int dir)
2043 {
2044 struct langwell_request *req;
2045 struct langwell_ep *ep;
2046 int status = 0;
2047
2048 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2049
2050 if (dir == EP_DIR_IN)
2051 dev->ep0_dir = USB_DIR_IN;
2052 else
2053 dev->ep0_dir = USB_DIR_OUT;
2054
2055 ep = &dev->ep[0];
2056 dev->ep0_state = WAIT_FOR_OUT_STATUS;
2057
2058 req = dev->status_req;
2059
2060 req->ep = ep;
2061 req->req.length = 0;
2062 req->req.status = -EINPROGRESS;
2063 req->req.actual = 0;
2064 req->req.complete = NULL;
2065 req->dtd_count = 0;
2066
2067 if (!req_to_dtd(req))
2068 status = queue_dtd(ep, req);
2069 else
2070 return -ENOMEM;
2071
2072 if (status)
2073 dev_err(&dev->pdev->dev, "can't queue ep0 status request\n");
2074
2075 list_add_tail(&req->queue, &ep->queue);
2076
2077 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2078 return status;
2079 }
2080
2081
2082 /* SET_ADDRESS request routine */
2083 static void set_address(struct langwell_udc *dev, u16 value,
2084 u16 index, u16 length)
2085 {
2086 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2087
2088 /* save the new address to device struct */
2089 dev->dev_addr = (u8) value;
2090 dev_vdbg(&dev->pdev->dev, "dev->dev_addr = %d\n", dev->dev_addr);
2091
2092 /* update usb state */
2093 dev->usb_state = USB_STATE_ADDRESS;
2094
2095 /* STATUS phase */
2096 if (prime_status_phase(dev, EP_DIR_IN))
2097 ep0_stall(dev);
2098
2099 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2100 }
2101
2102
2103 /* return endpoint by windex */
2104 static struct langwell_ep *get_ep_by_windex(struct langwell_udc *dev,
2105 u16 wIndex)
2106 {
2107 struct langwell_ep *ep;
2108 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2109
2110 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2111 return &dev->ep[0];
2112
2113 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2114 u8 bEndpointAddress;
2115 if (!ep->desc)
2116 continue;
2117
2118 bEndpointAddress = ep->desc->bEndpointAddress;
2119 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2120 continue;
2121
2122 if ((wIndex & USB_ENDPOINT_NUMBER_MASK)
2123 == (bEndpointAddress & USB_ENDPOINT_NUMBER_MASK))
2124 return ep;
2125 }
2126
2127 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2128 return NULL;
2129 }
2130
2131
2132 /* return whether endpoint is stalled, 0: not stalled; 1: stalled */
2133 static int ep_is_stall(struct langwell_ep *ep)
2134 {
2135 struct langwell_udc *dev = ep->dev;
2136 u32 endptctrl;
2137 int retval;
2138
2139 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2140
2141 endptctrl = readl(&dev->op_regs->endptctrl[ep->ep_num]);
2142 if (is_in(ep))
2143 retval = endptctrl & EPCTRL_TXS ? 1 : 0;
2144 else
2145 retval = endptctrl & EPCTRL_RXS ? 1 : 0;
2146
2147 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2148 return retval;
2149 }
2150
2151
2152 /* GET_STATUS request routine */
2153 static void get_status(struct langwell_udc *dev, u8 request_type, u16 value,
2154 u16 index, u16 length)
2155 {
2156 struct langwell_request *req;
2157 struct langwell_ep *ep;
2158 u16 status_data = 0; /* 16 bits cpu view status data */
2159 int status = 0;
2160
2161 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2162
2163 ep = &dev->ep[0];
2164
2165 if ((request_type & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
2166 /* get device status */
2167 status_data = dev->dev_status;
2168 } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_INTERFACE) {
2169 /* get interface status */
2170 status_data = 0;
2171 } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_ENDPOINT) {
2172 /* get endpoint status */
2173 struct langwell_ep *epn;
2174 epn = get_ep_by_windex(dev, index);
2175 /* stall if endpoint doesn't exist */
2176 if (!epn)
2177 goto stall;
2178
2179 status_data = ep_is_stall(epn) << USB_ENDPOINT_HALT;
2180 }
2181
2182 dev_dbg(&dev->pdev->dev, "get status data: 0x%04x\n", status_data);
2183
2184 dev->ep0_dir = USB_DIR_IN;
2185
2186 /* borrow the per device status_req */
2187 req = dev->status_req;
2188
2189 /* fill in the reqest structure */
2190 *((u16 *) req->req.buf) = cpu_to_le16(status_data);
2191 req->ep = ep;
2192 req->req.length = 2;
2193 req->req.status = -EINPROGRESS;
2194 req->req.actual = 0;
2195 req->req.complete = NULL;
2196 req->dtd_count = 0;
2197
2198 /* prime the data phase */
2199 if (!req_to_dtd(req))
2200 status = queue_dtd(ep, req);
2201 else /* no mem */
2202 goto stall;
2203
2204 if (status) {
2205 dev_err(&dev->pdev->dev,
2206 "response error on GET_STATUS request\n");
2207 goto stall;
2208 }
2209
2210 list_add_tail(&req->queue, &ep->queue);
2211 dev->ep0_state = DATA_STATE_XMIT;
2212
2213 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2214 return;
2215 stall:
2216 ep0_stall(dev);
2217 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2218 }
2219
2220
2221 /* setup packet interrupt handler */
2222 static void handle_setup_packet(struct langwell_udc *dev,
2223 struct usb_ctrlrequest *setup)
2224 {
2225 u16 wValue = le16_to_cpu(setup->wValue);
2226 u16 wIndex = le16_to_cpu(setup->wIndex);
2227 u16 wLength = le16_to_cpu(setup->wLength);
2228 u32 portsc1;
2229
2230 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2231
2232 /* ep0 fifo flush */
2233 nuke(&dev->ep[0], -ESHUTDOWN);
2234
2235 dev_dbg(&dev->pdev->dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
2236 setup->bRequestType, setup->bRequest,
2237 wValue, wIndex, wLength);
2238
2239 /* RNDIS gadget delegate */
2240 if ((setup->bRequestType == 0x21) && (setup->bRequest == 0x00)) {
2241 /* USB_CDC_SEND_ENCAPSULATED_COMMAND */
2242 goto delegate;
2243 }
2244
2245 /* USB_CDC_GET_ENCAPSULATED_RESPONSE */
2246 if ((setup->bRequestType == 0xa1) && (setup->bRequest == 0x01)) {
2247 /* USB_CDC_GET_ENCAPSULATED_RESPONSE */
2248 goto delegate;
2249 }
2250
2251 /* We process some stardard setup requests here */
2252 switch (setup->bRequest) {
2253 case USB_REQ_GET_STATUS:
2254 dev_dbg(&dev->pdev->dev, "SETUP: USB_REQ_GET_STATUS\n");
2255 /* get status, DATA and STATUS phase */
2256 if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK))
2257 != (USB_DIR_IN | USB_TYPE_STANDARD))
2258 break;
2259 get_status(dev, setup->bRequestType, wValue, wIndex, wLength);
2260 goto end;
2261
2262 case USB_REQ_SET_ADDRESS:
2263 dev_dbg(&dev->pdev->dev, "SETUP: USB_REQ_SET_ADDRESS\n");
2264 /* STATUS phase */
2265 if (setup->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD
2266 | USB_RECIP_DEVICE))
2267 break;
2268 set_address(dev, wValue, wIndex, wLength);
2269 goto end;
2270
2271 case USB_REQ_CLEAR_FEATURE:
2272 case USB_REQ_SET_FEATURE:
2273 /* STATUS phase */
2274 {
2275 int rc = -EOPNOTSUPP;
2276 if (setup->bRequest == USB_REQ_SET_FEATURE)
2277 dev_dbg(&dev->pdev->dev,
2278 "SETUP: USB_REQ_SET_FEATURE\n");
2279 else if (setup->bRequest == USB_REQ_CLEAR_FEATURE)
2280 dev_dbg(&dev->pdev->dev,
2281 "SETUP: USB_REQ_CLEAR_FEATURE\n");
2282
2283 if ((setup->bRequestType & (USB_RECIP_MASK | USB_TYPE_MASK))
2284 == (USB_RECIP_ENDPOINT | USB_TYPE_STANDARD)) {
2285 struct langwell_ep *epn;
2286 epn = get_ep_by_windex(dev, wIndex);
2287 /* stall if endpoint doesn't exist */
2288 if (!epn) {
2289 ep0_stall(dev);
2290 goto end;
2291 }
2292
2293 if (wValue != 0 || wLength != 0
2294 || epn->ep_num > dev->ep_max)
2295 break;
2296
2297 spin_unlock(&dev->lock);
2298 rc = langwell_ep_set_halt(&epn->ep,
2299 (setup->bRequest == USB_REQ_SET_FEATURE)
2300 ? 1 : 0);
2301 spin_lock(&dev->lock);
2302
2303 } else if ((setup->bRequestType & (USB_RECIP_MASK
2304 | USB_TYPE_MASK)) == (USB_RECIP_DEVICE
2305 | USB_TYPE_STANDARD)) {
2306 rc = 0;
2307 switch (wValue) {
2308 case USB_DEVICE_REMOTE_WAKEUP:
2309 if (setup->bRequest == USB_REQ_SET_FEATURE) {
2310 dev->remote_wakeup = 1;
2311 dev->dev_status |= (1 << wValue);
2312 } else {
2313 dev->remote_wakeup = 0;
2314 dev->dev_status &= ~(1 << wValue);
2315 }
2316 break;
2317 case USB_DEVICE_TEST_MODE:
2318 dev_dbg(&dev->pdev->dev, "SETUP: TEST MODE\n");
2319 if ((wIndex & 0xff) ||
2320 (dev->gadget.speed != USB_SPEED_HIGH))
2321 ep0_stall(dev);
2322
2323 switch (wIndex >> 8) {
2324 case TEST_J:
2325 case TEST_K:
2326 case TEST_SE0_NAK:
2327 case TEST_PACKET:
2328 case TEST_FORCE_EN:
2329 if (prime_status_phase(dev, EP_DIR_IN))
2330 ep0_stall(dev);
2331 portsc1 = readl(&dev->op_regs->portsc1);
2332 portsc1 |= (wIndex & 0xf00) << 8;
2333 writel(portsc1, &dev->op_regs->portsc1);
2334 goto end;
2335 default:
2336 rc = -EOPNOTSUPP;
2337 }
2338 break;
2339 default:
2340 rc = -EOPNOTSUPP;
2341 break;
2342 }
2343
2344 if (!gadget_is_otg(&dev->gadget))
2345 break;
2346 else if (setup->bRequest == USB_DEVICE_B_HNP_ENABLE) {
2347 dev->gadget.b_hnp_enable = 1;
2348 #ifdef OTG_TRANSCEIVER
2349 if (!dev->lotg->otg.default_a)
2350 dev->lotg->hsm.b_hnp_enable = 1;
2351 #endif
2352 } else if (setup->bRequest == USB_DEVICE_A_HNP_SUPPORT)
2353 dev->gadget.a_hnp_support = 1;
2354 else if (setup->bRequest ==
2355 USB_DEVICE_A_ALT_HNP_SUPPORT)
2356 dev->gadget.a_alt_hnp_support = 1;
2357 else
2358 break;
2359 } else
2360 break;
2361
2362 if (rc == 0) {
2363 if (prime_status_phase(dev, EP_DIR_IN))
2364 ep0_stall(dev);
2365 }
2366 goto end;
2367 }
2368
2369 case USB_REQ_GET_DESCRIPTOR:
2370 dev_dbg(&dev->pdev->dev,
2371 "SETUP: USB_REQ_GET_DESCRIPTOR\n");
2372 goto delegate;
2373
2374 case USB_REQ_SET_DESCRIPTOR:
2375 dev_dbg(&dev->pdev->dev,
2376 "SETUP: USB_REQ_SET_DESCRIPTOR unsupported\n");
2377 goto delegate;
2378
2379 case USB_REQ_GET_CONFIGURATION:
2380 dev_dbg(&dev->pdev->dev,
2381 "SETUP: USB_REQ_GET_CONFIGURATION\n");
2382 goto delegate;
2383
2384 case USB_REQ_SET_CONFIGURATION:
2385 dev_dbg(&dev->pdev->dev,
2386 "SETUP: USB_REQ_SET_CONFIGURATION\n");
2387 goto delegate;
2388
2389 case USB_REQ_GET_INTERFACE:
2390 dev_dbg(&dev->pdev->dev,
2391 "SETUP: USB_REQ_GET_INTERFACE\n");
2392 goto delegate;
2393
2394 case USB_REQ_SET_INTERFACE:
2395 dev_dbg(&dev->pdev->dev,
2396 "SETUP: USB_REQ_SET_INTERFACE\n");
2397 goto delegate;
2398
2399 case USB_REQ_SYNCH_FRAME:
2400 dev_dbg(&dev->pdev->dev,
2401 "SETUP: USB_REQ_SYNCH_FRAME unsupported\n");
2402 goto delegate;
2403
2404 default:
2405 /* delegate USB standard requests to the gadget driver */
2406 goto delegate;
2407 delegate:
2408 /* USB requests handled by gadget */
2409 if (wLength) {
2410 /* DATA phase from gadget, STATUS phase from udc */
2411 dev->ep0_dir = (setup->bRequestType & USB_DIR_IN)
2412 ? USB_DIR_IN : USB_DIR_OUT;
2413 dev_vdbg(&dev->pdev->dev,
2414 "dev->ep0_dir = 0x%x, wLength = %d\n",
2415 dev->ep0_dir, wLength);
2416 spin_unlock(&dev->lock);
2417 if (dev->driver->setup(&dev->gadget,
2418 &dev->local_setup_buff) < 0)
2419 ep0_stall(dev);
2420 spin_lock(&dev->lock);
2421 dev->ep0_state = (setup->bRequestType & USB_DIR_IN)
2422 ? DATA_STATE_XMIT : DATA_STATE_RECV;
2423 } else {
2424 /* no DATA phase, IN STATUS phase from gadget */
2425 dev->ep0_dir = USB_DIR_IN;
2426 dev_vdbg(&dev->pdev->dev,
2427 "dev->ep0_dir = 0x%x, wLength = %d\n",
2428 dev->ep0_dir, wLength);
2429 spin_unlock(&dev->lock);
2430 if (dev->driver->setup(&dev->gadget,
2431 &dev->local_setup_buff) < 0)
2432 ep0_stall(dev);
2433 spin_lock(&dev->lock);
2434 dev->ep0_state = WAIT_FOR_OUT_STATUS;
2435 }
2436 break;
2437 }
2438 end:
2439 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2440 }
2441
2442
2443 /* transfer completion, process endpoint request and free the completed dTDs
2444 * for this request
2445 */
2446 static int process_ep_req(struct langwell_udc *dev, int index,
2447 struct langwell_request *curr_req)
2448 {
2449 struct langwell_dtd *curr_dtd;
2450 struct langwell_dqh *curr_dqh;
2451 int td_complete, actual, remaining_length;
2452 int i, dir;
2453 u8 dtd_status = 0;
2454 int retval = 0;
2455
2456 curr_dqh = &dev->ep_dqh[index];
2457 dir = index % 2;
2458
2459 curr_dtd = curr_req->head;
2460 td_complete = 0;
2461 actual = curr_req->req.length;
2462
2463 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2464
2465 for (i = 0; i < curr_req->dtd_count; i++) {
2466
2467 /* command execution states by dTD */
2468 dtd_status = curr_dtd->dtd_status;
2469
2470 barrier();
2471 remaining_length = le16_to_cpu(curr_dtd->dtd_total);
2472 actual -= remaining_length;
2473
2474 if (!dtd_status) {
2475 /* transfers completed successfully */
2476 if (!remaining_length) {
2477 td_complete++;
2478 dev_vdbg(&dev->pdev->dev,
2479 "dTD transmitted successfully\n");
2480 } else {
2481 if (dir) {
2482 dev_vdbg(&dev->pdev->dev,
2483 "TX dTD remains data\n");
2484 retval = -EPROTO;
2485 break;
2486
2487 } else {
2488 td_complete++;
2489 break;
2490 }
2491 }
2492 } else {
2493 /* transfers completed with errors */
2494 if (dtd_status & DTD_STS_ACTIVE) {
2495 dev_dbg(&dev->pdev->dev,
2496 "dTD status ACTIVE dQH[%d]\n", index);
2497 retval = 1;
2498 return retval;
2499 } else if (dtd_status & DTD_STS_HALTED) {
2500 dev_err(&dev->pdev->dev,
2501 "dTD error %08x dQH[%d]\n",
2502 dtd_status, index);
2503 /* clear the errors and halt condition */
2504 curr_dqh->dtd_status = 0;
2505 retval = -EPIPE;
2506 break;
2507 } else if (dtd_status & DTD_STS_DBE) {
2508 dev_dbg(&dev->pdev->dev,
2509 "data buffer (overflow) error\n");
2510 retval = -EPROTO;
2511 break;
2512 } else if (dtd_status & DTD_STS_TRE) {
2513 dev_dbg(&dev->pdev->dev,
2514 "transaction(ISO) error\n");
2515 retval = -EILSEQ;
2516 break;
2517 } else
2518 dev_err(&dev->pdev->dev,
2519 "unknown error (0x%x)!\n",
2520 dtd_status);
2521 }
2522
2523 if (i != curr_req->dtd_count - 1)
2524 curr_dtd = (struct langwell_dtd *)
2525 curr_dtd->next_dtd_virt;
2526 }
2527
2528 if (retval)
2529 return retval;
2530
2531 curr_req->req.actual = actual;
2532
2533 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2534 return 0;
2535 }
2536
2537
2538 /* complete DATA or STATUS phase of ep0 prime status phase if needed */
2539 static void ep0_req_complete(struct langwell_udc *dev,
2540 struct langwell_ep *ep0, struct langwell_request *req)
2541 {
2542 u32 new_addr;
2543 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2544
2545 if (dev->usb_state == USB_STATE_ADDRESS) {
2546 /* set the new address */
2547 new_addr = (u32)dev->dev_addr;
2548 writel(new_addr << USBADR_SHIFT, &dev->op_regs->deviceaddr);
2549
2550 new_addr = USBADR(readl(&dev->op_regs->deviceaddr));
2551 dev_vdbg(&dev->pdev->dev, "new_addr = %d\n", new_addr);
2552 }
2553
2554 done(ep0, req, 0);
2555
2556 switch (dev->ep0_state) {
2557 case DATA_STATE_XMIT:
2558 /* receive status phase */
2559 if (prime_status_phase(dev, EP_DIR_OUT))
2560 ep0_stall(dev);
2561 break;
2562 case DATA_STATE_RECV:
2563 /* send status phase */
2564 if (prime_status_phase(dev, EP_DIR_IN))
2565 ep0_stall(dev);
2566 break;
2567 case WAIT_FOR_OUT_STATUS:
2568 dev->ep0_state = WAIT_FOR_SETUP;
2569 break;
2570 case WAIT_FOR_SETUP:
2571 dev_err(&dev->pdev->dev, "unexpect ep0 packets\n");
2572 break;
2573 default:
2574 ep0_stall(dev);
2575 break;
2576 }
2577
2578 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2579 }
2580
2581
2582 /* USB transfer completion interrupt */
2583 static void handle_trans_complete(struct langwell_udc *dev)
2584 {
2585 u32 complete_bits;
2586 int i, ep_num, dir, bit_mask, status;
2587 struct langwell_ep *epn;
2588 struct langwell_request *curr_req, *temp_req;
2589
2590 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2591
2592 complete_bits = readl(&dev->op_regs->endptcomplete);
2593 dev_vdbg(&dev->pdev->dev, "endptcomplete register: 0x%08x\n",
2594 complete_bits);
2595
2596 /* Write-Clear the bits in endptcomplete register */
2597 writel(complete_bits, &dev->op_regs->endptcomplete);
2598
2599 if (!complete_bits) {
2600 dev_dbg(&dev->pdev->dev, "complete_bits = 0\n");
2601 goto done;
2602 }
2603
2604 for (i = 0; i < dev->ep_max; i++) {
2605 ep_num = i / 2;
2606 dir = i % 2;
2607
2608 bit_mask = 1 << (ep_num + 16 * dir);
2609
2610 if (!(complete_bits & bit_mask))
2611 continue;
2612
2613 /* ep0 */
2614 if (i == 1)
2615 epn = &dev->ep[0];
2616 else
2617 epn = &dev->ep[i];
2618
2619 if (epn->name == NULL) {
2620 dev_warn(&dev->pdev->dev, "invalid endpoint\n");
2621 continue;
2622 }
2623
2624 if (i < 2)
2625 /* ep0 in and out */
2626 dev_dbg(&dev->pdev->dev, "%s-%s transfer completed\n",
2627 epn->name,
2628 is_in(epn) ? "in" : "out");
2629 else
2630 dev_dbg(&dev->pdev->dev, "%s transfer completed\n",
2631 epn->name);
2632
2633 /* process the req queue until an uncomplete request */
2634 list_for_each_entry_safe(curr_req, temp_req,
2635 &epn->queue, queue) {
2636 status = process_ep_req(dev, i, curr_req);
2637 dev_vdbg(&dev->pdev->dev, "%s req status: %d\n",
2638 epn->name, status);
2639
2640 if (status)
2641 break;
2642
2643 /* write back status to req */
2644 curr_req->req.status = status;
2645
2646 /* ep0 request completion */
2647 if (ep_num == 0) {
2648 ep0_req_complete(dev, epn, curr_req);
2649 break;
2650 } else {
2651 done(epn, curr_req, status);
2652 }
2653 }
2654 }
2655 done:
2656 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2657 }
2658
2659
2660 /* port change detect interrupt handler */
2661 static void handle_port_change(struct langwell_udc *dev)
2662 {
2663 u32 portsc1, devlc;
2664 u32 speed;
2665
2666 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2667
2668 if (dev->bus_reset)
2669 dev->bus_reset = 0;
2670
2671 portsc1 = readl(&dev->op_regs->portsc1);
2672 devlc = readl(&dev->op_regs->devlc);
2673 dev_vdbg(&dev->pdev->dev, "portsc1 = 0x%08x, devlc = 0x%08x\n",
2674 portsc1, devlc);
2675
2676 /* bus reset is finished */
2677 if (!(portsc1 & PORTS_PR)) {
2678 /* get the speed */
2679 speed = LPM_PSPD(devlc);
2680 switch (speed) {
2681 case LPM_SPEED_HIGH:
2682 dev->gadget.speed = USB_SPEED_HIGH;
2683 break;
2684 case LPM_SPEED_FULL:
2685 dev->gadget.speed = USB_SPEED_FULL;
2686 break;
2687 case LPM_SPEED_LOW:
2688 dev->gadget.speed = USB_SPEED_LOW;
2689 break;
2690 default:
2691 dev->gadget.speed = USB_SPEED_UNKNOWN;
2692 break;
2693 }
2694 dev_vdbg(&dev->pdev->dev,
2695 "speed = %d, dev->gadget.speed = %d\n",
2696 speed, dev->gadget.speed);
2697 }
2698
2699 /* LPM L0 to L1 */
2700 if (dev->lpm && dev->lpm_state == LPM_L0)
2701 if (portsc1 & PORTS_SUSP && portsc1 & PORTS_SLP) {
2702 dev_info(&dev->pdev->dev, "LPM L0 to L1\n");
2703 dev->lpm_state = LPM_L1;
2704 }
2705
2706 /* LPM L1 to L0, force resume or remote wakeup finished */
2707 if (dev->lpm && dev->lpm_state == LPM_L1)
2708 if (!(portsc1 & PORTS_SUSP)) {
2709 dev_info(&dev->pdev->dev, "LPM L1 to L0\n");
2710 dev->lpm_state = LPM_L0;
2711 }
2712
2713 /* update USB state */
2714 if (!dev->resume_state)
2715 dev->usb_state = USB_STATE_DEFAULT;
2716
2717 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2718 }
2719
2720
2721 /* USB reset interrupt handler */
2722 static void handle_usb_reset(struct langwell_udc *dev)
2723 {
2724 u32 deviceaddr,
2725 endptsetupstat,
2726 endptcomplete;
2727 unsigned long timeout;
2728
2729 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2730
2731 /* Write-Clear the device address */
2732 deviceaddr = readl(&dev->op_regs->deviceaddr);
2733 writel(deviceaddr & ~USBADR_MASK, &dev->op_regs->deviceaddr);
2734
2735 dev->dev_addr = 0;
2736
2737 /* clear usb state */
2738 dev->resume_state = 0;
2739
2740 /* LPM L1 to L0, reset */
2741 if (dev->lpm)
2742 dev->lpm_state = LPM_L0;
2743
2744 dev->ep0_dir = USB_DIR_OUT;
2745 dev->ep0_state = WAIT_FOR_SETUP;
2746
2747 /* remote wakeup reset to 0 when the device is reset */
2748 dev->remote_wakeup = 0;
2749 dev->dev_status = 1 << USB_DEVICE_SELF_POWERED;
2750 dev->gadget.b_hnp_enable = 0;
2751 dev->gadget.a_hnp_support = 0;
2752 dev->gadget.a_alt_hnp_support = 0;
2753
2754 /* Write-Clear all the setup token semaphores */
2755 endptsetupstat = readl(&dev->op_regs->endptsetupstat);
2756 writel(endptsetupstat, &dev->op_regs->endptsetupstat);
2757
2758 /* Write-Clear all the endpoint complete status bits */
2759 endptcomplete = readl(&dev->op_regs->endptcomplete);
2760 writel(endptcomplete, &dev->op_regs->endptcomplete);
2761
2762 /* wait until all endptprime bits cleared */
2763 timeout = jiffies + PRIME_TIMEOUT;
2764 while (readl(&dev->op_regs->endptprime)) {
2765 if (time_after(jiffies, timeout)) {
2766 dev_err(&dev->pdev->dev, "USB reset timeout\n");
2767 break;
2768 }
2769 cpu_relax();
2770 }
2771
2772 /* write 1s to endptflush register to clear any primed buffers */
2773 writel((u32) ~0, &dev->op_regs->endptflush);
2774
2775 if (readl(&dev->op_regs->portsc1) & PORTS_PR) {
2776 dev_vdbg(&dev->pdev->dev, "USB bus reset\n");
2777 /* bus is reseting */
2778 dev->bus_reset = 1;
2779
2780 /* reset all the queues, stop all USB activities */
2781 stop_activity(dev, dev->driver);
2782 dev->usb_state = USB_STATE_DEFAULT;
2783 } else {
2784 dev_vdbg(&dev->pdev->dev, "device controller reset\n");
2785 /* controller reset */
2786 langwell_udc_reset(dev);
2787
2788 /* reset all the queues, stop all USB activities */
2789 stop_activity(dev, dev->driver);
2790
2791 /* reset ep0 dQH and endptctrl */
2792 ep0_reset(dev);
2793
2794 /* enable interrupt and set controller to run state */
2795 langwell_udc_start(dev);
2796
2797 dev->usb_state = USB_STATE_ATTACHED;
2798 }
2799
2800 #ifdef OTG_TRANSCEIVER
2801 /* refer to USB OTG 6.6.2.3 b_hnp_en is cleared */
2802 if (!dev->lotg->otg.default_a)
2803 dev->lotg->hsm.b_hnp_enable = 0;
2804 #endif
2805
2806 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2807 }
2808
2809
2810 /* USB bus suspend/resume interrupt */
2811 static void handle_bus_suspend(struct langwell_udc *dev)
2812 {
2813 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
2814
2815 dev->resume_state = dev->usb_state;
2816 dev->usb_state = USB_STATE_SUSPENDED;
2817
2818 #ifdef OTG_TRANSCEIVER
2819 if (dev->lotg->otg.default_a) {
2820 if (dev->lotg->hsm.b_bus_suspend_vld == 1) {
2821 dev->lotg->hsm.b_bus_suspend = 1;
2822 /* notify transceiver the state changes */
2823 if (spin_trylock(&dev->lotg->wq_lock)) {
2824 langwell_update_transceiver();
2825 spin_unlock(&dev->lotg->wq_lock);
2826 }
2827 }
2828 dev->lotg->hsm.b_bus_suspend_vld++;
2829 } else {
2830 if (!dev->lotg->hsm.a_bus_suspend) {
2831 dev->lotg->hsm.a_bus_suspend = 1;
2832 /* notify transceiver the state changes */
2833 if (spin_trylock(&dev->lotg->wq_lock)) {
2834 langwell_update_transceiver();
2835 spin_unlock(&dev->lotg->wq_lock);
2836 }
2837 }
2838 }
2839 #endif
2840
2841 /* report suspend to the driver */
2842 if (dev->driver) {
2843 if (dev->driver->suspend) {
2844 spin_unlock(&dev->lock);
2845 dev->driver->suspend(&dev->gadget);
2846 spin_lock(&dev->lock);
2847 dev_dbg(&dev->pdev->dev, "suspend %s\n",
2848 dev->driver->driver.name);
2849 }
2850 }
2851
2852 /* enter PHY low power suspend */
2853 if (dev->pdev->device != 0x0829)
2854 langwell_phy_low_power(dev, 0);
2855
2856 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2857 }
2858
2859
2860 static void handle_bus_resume(struct langwell_udc *dev)
2861 {
2862 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
2863
2864 dev->usb_state = dev->resume_state;
2865 dev->resume_state = 0;
2866
2867 /* exit PHY low power suspend */
2868 if (dev->pdev->device != 0x0829)
2869 langwell_phy_low_power(dev, 0);
2870
2871 #ifdef OTG_TRANSCEIVER
2872 if (dev->lotg->otg.default_a == 0)
2873 dev->lotg->hsm.a_bus_suspend = 0;
2874 #endif
2875
2876 /* report resume to the driver */
2877 if (dev->driver) {
2878 if (dev->driver->resume) {
2879 spin_unlock(&dev->lock);
2880 dev->driver->resume(&dev->gadget);
2881 spin_lock(&dev->lock);
2882 dev_dbg(&dev->pdev->dev, "resume %s\n",
2883 dev->driver->driver.name);
2884 }
2885 }
2886
2887 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2888 }
2889
2890
2891 /* USB device controller interrupt handler */
2892 static irqreturn_t langwell_irq(int irq, void *_dev)
2893 {
2894 struct langwell_udc *dev = _dev;
2895 u32 usbsts,
2896 usbintr,
2897 irq_sts,
2898 portsc1;
2899
2900 dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
2901
2902 if (dev->stopped) {
2903 dev_vdbg(&dev->pdev->dev, "handle IRQ_NONE\n");
2904 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2905 return IRQ_NONE;
2906 }
2907
2908 spin_lock(&dev->lock);
2909
2910 /* USB status */
2911 usbsts = readl(&dev->op_regs->usbsts);
2912
2913 /* USB interrupt enable */
2914 usbintr = readl(&dev->op_regs->usbintr);
2915
2916 irq_sts = usbsts & usbintr;
2917 dev_vdbg(&dev->pdev->dev,
2918 "usbsts = 0x%08x, usbintr = 0x%08x, irq_sts = 0x%08x\n",
2919 usbsts, usbintr, irq_sts);
2920
2921 if (!irq_sts) {
2922 dev_vdbg(&dev->pdev->dev, "handle IRQ_NONE\n");
2923 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2924 spin_unlock(&dev->lock);
2925 return IRQ_NONE;
2926 }
2927
2928 /* Write-Clear interrupt status bits */
2929 writel(irq_sts, &dev->op_regs->usbsts);
2930
2931 /* resume from suspend */
2932 portsc1 = readl(&dev->op_regs->portsc1);
2933 if (dev->usb_state == USB_STATE_SUSPENDED)
2934 if (!(portsc1 & PORTS_SUSP))
2935 handle_bus_resume(dev);
2936
2937 /* USB interrupt */
2938 if (irq_sts & STS_UI) {
2939 dev_vdbg(&dev->pdev->dev, "USB interrupt\n");
2940
2941 /* setup packet received from ep0 */
2942 if (readl(&dev->op_regs->endptsetupstat)
2943 & EP0SETUPSTAT_MASK) {
2944 dev_vdbg(&dev->pdev->dev,
2945 "USB SETUP packet received interrupt\n");
2946 /* setup tripwire semaphone */
2947 setup_tripwire(dev);
2948 handle_setup_packet(dev, &dev->local_setup_buff);
2949 }
2950
2951 /* USB transfer completion */
2952 if (readl(&dev->op_regs->endptcomplete)) {
2953 dev_vdbg(&dev->pdev->dev,
2954 "USB transfer completion interrupt\n");
2955 handle_trans_complete(dev);
2956 }
2957 }
2958
2959 /* SOF received interrupt (for ISO transfer) */
2960 if (irq_sts & STS_SRI) {
2961 /* FIXME */
2962 /* dev_vdbg(&dev->pdev->dev, "SOF received interrupt\n"); */
2963 }
2964
2965 /* port change detect interrupt */
2966 if (irq_sts & STS_PCI) {
2967 dev_vdbg(&dev->pdev->dev, "port change detect interrupt\n");
2968 handle_port_change(dev);
2969 }
2970
2971 /* suspend interrrupt */
2972 if (irq_sts & STS_SLI) {
2973 dev_vdbg(&dev->pdev->dev, "suspend interrupt\n");
2974 handle_bus_suspend(dev);
2975 }
2976
2977 /* USB reset interrupt */
2978 if (irq_sts & STS_URI) {
2979 dev_vdbg(&dev->pdev->dev, "USB reset interrupt\n");
2980 handle_usb_reset(dev);
2981 }
2982
2983 /* USB error or system error interrupt */
2984 if (irq_sts & (STS_UEI | STS_SEI)) {
2985 /* FIXME */
2986 dev_warn(&dev->pdev->dev, "error IRQ, irq_sts: %x\n", irq_sts);
2987 }
2988
2989 spin_unlock(&dev->lock);
2990
2991 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
2992 return IRQ_HANDLED;
2993 }
2994
2995
2996 /*-------------------------------------------------------------------------*/
2997
2998 /* release device structure */
2999 static void gadget_release(struct device *_dev)
3000 {
3001 struct langwell_udc *dev = the_controller;
3002
3003 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3004
3005 complete(dev->done);
3006
3007 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3008 kfree(dev);
3009 }
3010
3011
3012 /* enable SRAM caching if SRAM detected */
3013 static void sram_init(struct langwell_udc *dev)
3014 {
3015 struct pci_dev *pdev = dev->pdev;
3016
3017 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3018
3019 dev->sram_addr = pci_resource_start(pdev, 1);
3020 dev->sram_size = pci_resource_len(pdev, 1);
3021 dev_info(&dev->pdev->dev, "Found private SRAM at %x size:%x\n",
3022 dev->sram_addr, dev->sram_size);
3023 dev->got_sram = 1;
3024
3025 if (pci_request_region(pdev, 1, kobject_name(&pdev->dev.kobj))) {
3026 dev_warn(&dev->pdev->dev, "SRAM request failed\n");
3027 dev->got_sram = 0;
3028 } else if (!dma_declare_coherent_memory(&pdev->dev, dev->sram_addr,
3029 dev->sram_addr, dev->sram_size, DMA_MEMORY_MAP)) {
3030 dev_warn(&dev->pdev->dev, "SRAM DMA declare failed\n");
3031 pci_release_region(pdev, 1);
3032 dev->got_sram = 0;
3033 }
3034
3035 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3036 }
3037
3038
3039 /* release SRAM caching */
3040 static void sram_deinit(struct langwell_udc *dev)
3041 {
3042 struct pci_dev *pdev = dev->pdev;
3043
3044 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3045
3046 dma_release_declared_memory(&pdev->dev);
3047 pci_release_region(pdev, 1);
3048
3049 dev->got_sram = 0;
3050
3051 dev_info(&dev->pdev->dev, "release SRAM caching\n");
3052 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3053 }
3054
3055
3056 /* tear down the binding between this driver and the pci device */
3057 static void langwell_udc_remove(struct pci_dev *pdev)
3058 {
3059 struct langwell_udc *dev = the_controller;
3060
3061 DECLARE_COMPLETION(done);
3062
3063 BUG_ON(dev->driver);
3064 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3065
3066 dev->done = &done;
3067
3068 #ifndef OTG_TRANSCEIVER
3069 /* free dTD dma_pool and dQH */
3070 if (dev->dtd_pool)
3071 dma_pool_destroy(dev->dtd_pool);
3072
3073 if (dev->ep_dqh)
3074 dma_free_coherent(&pdev->dev, dev->ep_dqh_size,
3075 dev->ep_dqh, dev->ep_dqh_dma);
3076
3077 /* release SRAM caching */
3078 if (dev->has_sram && dev->got_sram)
3079 sram_deinit(dev);
3080 #endif
3081
3082 if (dev->status_req) {
3083 kfree(dev->status_req->req.buf);
3084 kfree(dev->status_req);
3085 }
3086
3087 kfree(dev->ep);
3088
3089 /* disable IRQ handler */
3090 if (dev->got_irq)
3091 free_irq(pdev->irq, dev);
3092
3093 #ifndef OTG_TRANSCEIVER
3094 if (dev->cap_regs)
3095 iounmap(dev->cap_regs);
3096
3097 if (dev->region)
3098 release_mem_region(pci_resource_start(pdev, 0),
3099 pci_resource_len(pdev, 0));
3100
3101 if (dev->enabled)
3102 pci_disable_device(pdev);
3103 #else
3104 if (dev->transceiver) {
3105 otg_put_transceiver(dev->transceiver);
3106 dev->transceiver = NULL;
3107 dev->lotg = NULL;
3108 }
3109 #endif
3110
3111 dev->cap_regs = NULL;
3112
3113 dev_info(&dev->pdev->dev, "unbind\n");
3114 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3115
3116 device_unregister(&dev->gadget.dev);
3117 device_remove_file(&pdev->dev, &dev_attr_langwell_udc);
3118 device_remove_file(&pdev->dev, &dev_attr_remote_wakeup);
3119
3120 #ifndef OTG_TRANSCEIVER
3121 pci_set_drvdata(pdev, NULL);
3122 #endif
3123
3124 /* free dev, wait for the release() finished */
3125 wait_for_completion(&done);
3126
3127 the_controller = NULL;
3128 }
3129
3130
3131 /*
3132 * wrap this driver around the specified device, but
3133 * don't respond over USB until a gadget driver binds to us.
3134 */
3135 static int langwell_udc_probe(struct pci_dev *pdev,
3136 const struct pci_device_id *id)
3137 {
3138 struct langwell_udc *dev;
3139 #ifndef OTG_TRANSCEIVER
3140 unsigned long resource, len;
3141 #endif
3142 void __iomem *base = NULL;
3143 size_t size;
3144 int retval;
3145
3146 if (the_controller) {
3147 dev_warn(&pdev->dev, "ignoring\n");
3148 return -EBUSY;
3149 }
3150
3151 /* alloc, and start init */
3152 dev = kzalloc(sizeof *dev, GFP_KERNEL);
3153 if (dev == NULL) {
3154 retval = -ENOMEM;
3155 goto error;
3156 }
3157
3158 /* initialize device spinlock */
3159 spin_lock_init(&dev->lock);
3160
3161 dev->pdev = pdev;
3162 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3163
3164 #ifdef OTG_TRANSCEIVER
3165 /* PCI device is already enabled by otg_transceiver driver */
3166 dev->enabled = 1;
3167
3168 /* mem region and register base */
3169 dev->region = 1;
3170 dev->transceiver = otg_get_transceiver();
3171 dev->lotg = otg_to_langwell(dev->transceiver);
3172 base = dev->lotg->regs;
3173 #else
3174 pci_set_drvdata(pdev, dev);
3175
3176 /* now all the pci goodies ... */
3177 if (pci_enable_device(pdev) < 0) {
3178 retval = -ENODEV;
3179 goto error;
3180 }
3181 dev->enabled = 1;
3182
3183 /* control register: BAR 0 */
3184 resource = pci_resource_start(pdev, 0);
3185 len = pci_resource_len(pdev, 0);
3186 if (!request_mem_region(resource, len, driver_name)) {
3187 dev_err(&dev->pdev->dev, "controller already in use\n");
3188 retval = -EBUSY;
3189 goto error;
3190 }
3191 dev->region = 1;
3192
3193 base = ioremap_nocache(resource, len);
3194 #endif
3195 if (base == NULL) {
3196 dev_err(&dev->pdev->dev, "can't map memory\n");
3197 retval = -EFAULT;
3198 goto error;
3199 }
3200
3201 dev->cap_regs = (struct langwell_cap_regs __iomem *) base;
3202 dev_vdbg(&dev->pdev->dev, "dev->cap_regs: %p\n", dev->cap_regs);
3203 dev->op_regs = (struct langwell_op_regs __iomem *)
3204 (base + OP_REG_OFFSET);
3205 dev_vdbg(&dev->pdev->dev, "dev->op_regs: %p\n", dev->op_regs);
3206
3207 /* irq setup after old hardware is cleaned up */
3208 if (!pdev->irq) {
3209 dev_err(&dev->pdev->dev, "No IRQ. Check PCI setup!\n");
3210 retval = -ENODEV;
3211 goto error;
3212 }
3213
3214 dev->has_sram = 1;
3215 dev->got_sram = 0;
3216 dev_vdbg(&dev->pdev->dev, "dev->has_sram: %d\n", dev->has_sram);
3217
3218 #ifndef OTG_TRANSCEIVER
3219 /* enable SRAM caching if detected */
3220 if (dev->has_sram && !dev->got_sram)
3221 sram_init(dev);
3222
3223 dev_info(&dev->pdev->dev,
3224 "irq %d, io mem: 0x%08lx, len: 0x%08lx, pci mem 0x%p\n",
3225 pdev->irq, resource, len, base);
3226 /* enables bus-mastering for device dev */
3227 pci_set_master(pdev);
3228
3229 if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED,
3230 driver_name, dev) != 0) {
3231 dev_err(&dev->pdev->dev,
3232 "request interrupt %d failed\n", pdev->irq);
3233 retval = -EBUSY;
3234 goto error;
3235 }
3236 dev->got_irq = 1;
3237 #endif
3238
3239 /* set stopped bit */
3240 dev->stopped = 1;
3241
3242 /* capabilities and endpoint number */
3243 dev->lpm = (readl(&dev->cap_regs->hccparams) & HCC_LEN) ? 1 : 0;
3244 dev->dciversion = readw(&dev->cap_regs->dciversion);
3245 dev->devcap = (readl(&dev->cap_regs->dccparams) & DEVCAP) ? 1 : 0;
3246 dev_vdbg(&dev->pdev->dev, "dev->lpm: %d\n", dev->lpm);
3247 dev_vdbg(&dev->pdev->dev, "dev->dciversion: 0x%04x\n",
3248 dev->dciversion);
3249 dev_vdbg(&dev->pdev->dev, "dccparams: 0x%08x\n",
3250 readl(&dev->cap_regs->dccparams));
3251 dev_vdbg(&dev->pdev->dev, "dev->devcap: %d\n", dev->devcap);
3252 if (!dev->devcap) {
3253 dev_err(&dev->pdev->dev, "can't support device mode\n");
3254 retval = -ENODEV;
3255 goto error;
3256 }
3257
3258 /* a pair of endpoints (out/in) for each address */
3259 dev->ep_max = DEN(readl(&dev->cap_regs->dccparams)) * 2;
3260 dev_vdbg(&dev->pdev->dev, "dev->ep_max: %d\n", dev->ep_max);
3261
3262 /* allocate endpoints memory */
3263 dev->ep = kzalloc(sizeof(struct langwell_ep) * dev->ep_max,
3264 GFP_KERNEL);
3265 if (!dev->ep) {
3266 dev_err(&dev->pdev->dev, "allocate endpoints memory failed\n");
3267 retval = -ENOMEM;
3268 goto error;
3269 }
3270
3271 /* allocate device dQH memory */
3272 size = dev->ep_max * sizeof(struct langwell_dqh);
3273 dev_vdbg(&dev->pdev->dev, "orig size = %d\n", size);
3274 if (size < DQH_ALIGNMENT)
3275 size = DQH_ALIGNMENT;
3276 else if ((size % DQH_ALIGNMENT) != 0) {
3277 size += DQH_ALIGNMENT + 1;
3278 size &= ~(DQH_ALIGNMENT - 1);
3279 }
3280 dev->ep_dqh = dma_alloc_coherent(&pdev->dev, size,
3281 &dev->ep_dqh_dma, GFP_KERNEL);
3282 if (!dev->ep_dqh) {
3283 dev_err(&dev->pdev->dev, "allocate dQH memory failed\n");
3284 retval = -ENOMEM;
3285 goto error;
3286 }
3287 dev->ep_dqh_size = size;
3288 dev_vdbg(&dev->pdev->dev, "ep_dqh_size = %d\n", dev->ep_dqh_size);
3289
3290 /* initialize ep0 status request structure */
3291 dev->status_req = kzalloc(sizeof(struct langwell_request), GFP_KERNEL);
3292 if (!dev->status_req) {
3293 dev_err(&dev->pdev->dev,
3294 "allocate status_req memory failed\n");
3295 retval = -ENOMEM;
3296 goto error;
3297 }
3298 INIT_LIST_HEAD(&dev->status_req->queue);
3299
3300 /* allocate a small amount of memory to get valid address */
3301 dev->status_req->req.buf = kmalloc(8, GFP_KERNEL);
3302 dev->status_req->req.dma = virt_to_phys(dev->status_req->req.buf);
3303
3304 dev->resume_state = USB_STATE_NOTATTACHED;
3305 dev->usb_state = USB_STATE_POWERED;
3306 dev->ep0_dir = USB_DIR_OUT;
3307
3308 /* remote wakeup reset to 0 when the device is reset */
3309 dev->remote_wakeup = 0;
3310 dev->dev_status = 1 << USB_DEVICE_SELF_POWERED;
3311
3312 #ifndef OTG_TRANSCEIVER
3313 /* reset device controller */
3314 langwell_udc_reset(dev);
3315 #endif
3316
3317 /* initialize gadget structure */
3318 dev->gadget.ops = &langwell_ops; /* usb_gadget_ops */
3319 dev->gadget.ep0 = &dev->ep[0].ep; /* gadget ep0 */
3320 INIT_LIST_HEAD(&dev->gadget.ep_list); /* ep_list */
3321 dev->gadget.speed = USB_SPEED_UNKNOWN; /* speed */
3322 dev->gadget.is_dualspeed = 1; /* support dual speed */
3323 #ifdef OTG_TRANSCEIVER
3324 dev->gadget.is_otg = 1; /* support otg mode */
3325 #endif
3326
3327 /* the "gadget" abstracts/virtualizes the controller */
3328 dev_set_name(&dev->gadget.dev, "gadget");
3329 dev->gadget.dev.parent = &pdev->dev;
3330 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
3331 dev->gadget.dev.release = gadget_release;
3332 dev->gadget.name = driver_name; /* gadget name */
3333
3334 /* controller endpoints reinit */
3335 eps_reinit(dev);
3336
3337 #ifndef OTG_TRANSCEIVER
3338 /* reset ep0 dQH and endptctrl */
3339 ep0_reset(dev);
3340 #endif
3341
3342 /* create dTD dma_pool resource */
3343 dev->dtd_pool = dma_pool_create("langwell_dtd",
3344 &dev->pdev->dev,
3345 sizeof(struct langwell_dtd),
3346 DTD_ALIGNMENT,
3347 DMA_BOUNDARY);
3348
3349 if (!dev->dtd_pool) {
3350 retval = -ENOMEM;
3351 goto error;
3352 }
3353
3354 /* done */
3355 dev_info(&dev->pdev->dev, "%s\n", driver_desc);
3356 dev_info(&dev->pdev->dev, "irq %d, pci mem %p\n", pdev->irq, base);
3357 dev_info(&dev->pdev->dev, "Driver version: " DRIVER_VERSION "\n");
3358 dev_info(&dev->pdev->dev, "Support (max) %d endpoints\n", dev->ep_max);
3359 dev_info(&dev->pdev->dev, "Device interface version: 0x%04x\n",
3360 dev->dciversion);
3361 dev_info(&dev->pdev->dev, "Controller mode: %s\n",
3362 dev->devcap ? "Device" : "Host");
3363 dev_info(&dev->pdev->dev, "Support USB LPM: %s\n",
3364 dev->lpm ? "Yes" : "No");
3365
3366 dev_vdbg(&dev->pdev->dev,
3367 "After langwell_udc_probe(), print all registers:\n");
3368 print_all_registers(dev);
3369
3370 the_controller = dev;
3371
3372 retval = device_register(&dev->gadget.dev);
3373 if (retval)
3374 goto error;
3375
3376 retval = device_create_file(&pdev->dev, &dev_attr_langwell_udc);
3377 if (retval)
3378 goto error;
3379
3380 retval = device_create_file(&pdev->dev, &dev_attr_remote_wakeup);
3381 if (retval)
3382 goto error_attr1;
3383
3384 dev_vdbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3385 return 0;
3386
3387 error_attr1:
3388 device_remove_file(&pdev->dev, &dev_attr_langwell_udc);
3389 error:
3390 if (dev) {
3391 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3392 langwell_udc_remove(pdev);
3393 }
3394
3395 return retval;
3396 }
3397
3398
3399 /* device controller suspend */
3400 static int langwell_udc_suspend(struct pci_dev *pdev, pm_message_t state)
3401 {
3402 struct langwell_udc *dev = the_controller;
3403
3404 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3405
3406 /* disable interrupt and set controller to stop state */
3407 langwell_udc_stop(dev);
3408
3409 /* disable IRQ handler */
3410 if (dev->got_irq)
3411 free_irq(pdev->irq, dev);
3412 dev->got_irq = 0;
3413
3414 /* save PCI state */
3415 pci_save_state(pdev);
3416
3417 spin_lock_irq(&dev->lock);
3418 /* stop all usb activities */
3419 stop_activity(dev, dev->driver);
3420 spin_unlock_irq(&dev->lock);
3421
3422 /* free dTD dma_pool and dQH */
3423 if (dev->dtd_pool)
3424 dma_pool_destroy(dev->dtd_pool);
3425
3426 if (dev->ep_dqh)
3427 dma_free_coherent(&pdev->dev, dev->ep_dqh_size,
3428 dev->ep_dqh, dev->ep_dqh_dma);
3429
3430 /* release SRAM caching */
3431 if (dev->has_sram && dev->got_sram)
3432 sram_deinit(dev);
3433
3434 /* set device power state */
3435 pci_set_power_state(pdev, PCI_D3hot);
3436
3437 /* enter PHY low power suspend */
3438 if (dev->pdev->device != 0x0829)
3439 langwell_phy_low_power(dev, 1);
3440
3441 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3442 return 0;
3443 }
3444
3445
3446 /* device controller resume */
3447 static int langwell_udc_resume(struct pci_dev *pdev)
3448 {
3449 struct langwell_udc *dev = the_controller;
3450 size_t size;
3451
3452 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3453
3454 /* exit PHY low power suspend */
3455 if (dev->pdev->device != 0x0829)
3456 langwell_phy_low_power(dev, 0);
3457
3458 /* set device D0 power state */
3459 pci_set_power_state(pdev, PCI_D0);
3460
3461 /* enable SRAM caching if detected */
3462 if (dev->has_sram && !dev->got_sram)
3463 sram_init(dev);
3464
3465 /* allocate device dQH memory */
3466 size = dev->ep_max * sizeof(struct langwell_dqh);
3467 dev_vdbg(&dev->pdev->dev, "orig size = %d\n", size);
3468 if (size < DQH_ALIGNMENT)
3469 size = DQH_ALIGNMENT;
3470 else if ((size % DQH_ALIGNMENT) != 0) {
3471 size += DQH_ALIGNMENT + 1;
3472 size &= ~(DQH_ALIGNMENT - 1);
3473 }
3474 dev->ep_dqh = dma_alloc_coherent(&pdev->dev, size,
3475 &dev->ep_dqh_dma, GFP_KERNEL);
3476 if (!dev->ep_dqh) {
3477 dev_err(&dev->pdev->dev, "allocate dQH memory failed\n");
3478 return -ENOMEM;
3479 }
3480 dev->ep_dqh_size = size;
3481 dev_vdbg(&dev->pdev->dev, "ep_dqh_size = %d\n", dev->ep_dqh_size);
3482
3483 /* create dTD dma_pool resource */
3484 dev->dtd_pool = dma_pool_create("langwell_dtd",
3485 &dev->pdev->dev,
3486 sizeof(struct langwell_dtd),
3487 DTD_ALIGNMENT,
3488 DMA_BOUNDARY);
3489
3490 if (!dev->dtd_pool)
3491 return -ENOMEM;
3492
3493 /* restore PCI state */
3494 pci_restore_state(pdev);
3495
3496 /* enable IRQ handler */
3497 if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED,
3498 driver_name, dev) != 0) {
3499 dev_err(&dev->pdev->dev, "request interrupt %d failed\n",
3500 pdev->irq);
3501 return -EBUSY;
3502 }
3503 dev->got_irq = 1;
3504
3505 /* reset and start controller to run state */
3506 if (dev->stopped) {
3507 /* reset device controller */
3508 langwell_udc_reset(dev);
3509
3510 /* reset ep0 dQH and endptctrl */
3511 ep0_reset(dev);
3512
3513 /* start device if gadget is loaded */
3514 if (dev->driver)
3515 langwell_udc_start(dev);
3516 }
3517
3518 /* reset USB status */
3519 dev->usb_state = USB_STATE_ATTACHED;
3520 dev->ep0_state = WAIT_FOR_SETUP;
3521 dev->ep0_dir = USB_DIR_OUT;
3522
3523 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3524 return 0;
3525 }
3526
3527
3528 /* pci driver shutdown */
3529 static void langwell_udc_shutdown(struct pci_dev *pdev)
3530 {
3531 struct langwell_udc *dev = the_controller;
3532 u32 usbmode;
3533
3534 dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
3535
3536 /* reset controller mode to IDLE */
3537 usbmode = readl(&dev->op_regs->usbmode);
3538 dev_dbg(&dev->pdev->dev, "usbmode = 0x%08x\n", usbmode);
3539 usbmode &= (~3 | MODE_IDLE);
3540 writel(usbmode, &dev->op_regs->usbmode);
3541
3542 dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
3543 }
3544
3545 /*-------------------------------------------------------------------------*/
3546
3547 static const struct pci_device_id pci_ids[] = { {
3548 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3549 .class_mask = ~0,
3550 .vendor = 0x8086,
3551 .device = 0x0811,
3552 .subvendor = PCI_ANY_ID,
3553 .subdevice = PCI_ANY_ID,
3554 }, { /* end: all zeroes */ }
3555 };
3556
3557 MODULE_DEVICE_TABLE(pci, pci_ids);
3558
3559
3560 static struct pci_driver langwell_pci_driver = {
3561 .name = (char *) driver_name,
3562 .id_table = pci_ids,
3563
3564 .probe = langwell_udc_probe,
3565 .remove = langwell_udc_remove,
3566
3567 /* device controller suspend/resume */
3568 .suspend = langwell_udc_suspend,
3569 .resume = langwell_udc_resume,
3570
3571 .shutdown = langwell_udc_shutdown,
3572 };
3573
3574
3575 static int __init init(void)
3576 {
3577 #ifdef OTG_TRANSCEIVER
3578 return langwell_register_peripheral(&langwell_pci_driver);
3579 #else
3580 return pci_register_driver(&langwell_pci_driver);
3581 #endif
3582 }
3583 module_init(init);
3584
3585
3586 static void __exit cleanup(void)
3587 {
3588 #ifdef OTG_TRANSCEIVER
3589 return langwell_unregister_peripheral(&langwell_pci_driver);
3590 #else
3591 pci_unregister_driver(&langwell_pci_driver);
3592 #endif
3593 }
3594 module_exit(cleanup);
3595
3596
3597 MODULE_DESCRIPTION(DRIVER_DESC);
3598 MODULE_AUTHOR("Xiaochen Shen <xiaochen.shen@intel.com>");
3599 MODULE_VERSION(DRIVER_VERSION);
3600 MODULE_LICENSE("GPL");
3601
linux-next