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Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[linux-2.6/kvm.git] / drivers / usb / gadget / mv_udc_core.c
blob892412103dd865c05cd5a2b1844f323701784108
1 /*
2 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
3 * Author: Chao Xie <chao.xie@marvell.com>
4 * Neil Zhang <zhangwm@marvell.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/dmapool.h>
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <linux/ioport.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/errno.h>
22 #include <linux/init.h>
23 #include <linux/timer.h>
24 #include <linux/list.h>
25 #include <linux/interrupt.h>
26 #include <linux/moduleparam.h>
27 #include <linux/device.h>
28 #include <linux/usb/ch9.h>
29 #include <linux/usb/gadget.h>
30 #include <linux/usb/otg.h>
31 #include <linux/pm.h>
32 #include <linux/io.h>
33 #include <linux/irq.h>
34 #include <linux/platform_device.h>
35 #include <linux/clk.h>
36 #include <linux/platform_data/mv_usb.h>
37 #include <asm/system.h>
38 #include <asm/unaligned.h>
39
40 #include "mv_udc.h"
41
42 #define DRIVER_DESC "Marvell PXA USB Device Controller driver"
43 #define DRIVER_VERSION "8 Nov 2010"
44
45 #define ep_dir(ep) (((ep)->ep_num == 0) ? \
46 ((ep)->udc->ep0_dir) : ((ep)->direction))
47
48 /* timeout value -- usec */
49 #define RESET_TIMEOUT 10000
50 #define FLUSH_TIMEOUT 10000
51 #define EPSTATUS_TIMEOUT 10000
52 #define PRIME_TIMEOUT 10000
53 #define READSAFE_TIMEOUT 1000
54 #define DTD_TIMEOUT 1000
55
56 #define LOOPS_USEC_SHIFT 4
57 #define LOOPS_USEC (1 << LOOPS_USEC_SHIFT)
58 #define LOOPS(timeout) ((timeout) >> LOOPS_USEC_SHIFT)
59
60 static DECLARE_COMPLETION(release_done);
61
62 static const char driver_name[] = "mv_udc";
63 static const char driver_desc[] = DRIVER_DESC;
64
65 /* controller device global variable */
66 static struct mv_udc *the_controller;
67 int mv_usb_otgsc;
68
69 static void nuke(struct mv_ep *ep, int status);
70 static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver);
71
72 /* for endpoint 0 operations */
73 static const struct usb_endpoint_descriptor mv_ep0_desc = {
74 .bLength = USB_DT_ENDPOINT_SIZE,
75 .bDescriptorType = USB_DT_ENDPOINT,
76 .bEndpointAddress = 0,
77 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
78 .wMaxPacketSize = EP0_MAX_PKT_SIZE,
79 };
80
81 static void ep0_reset(struct mv_udc *udc)
82 {
83 struct mv_ep *ep;
84 u32 epctrlx;
85 int i = 0;
86
87 /* ep0 in and out */
88 for (i = 0; i < 2; i++) {
89 ep = &udc->eps[i];
90 ep->udc = udc;
91
92 /* ep0 dQH */
93 ep->dqh = &udc->ep_dqh[i];
94
95 /* configure ep0 endpoint capabilities in dQH */
96 ep->dqh->max_packet_length =
97 (EP0_MAX_PKT_SIZE << EP_QUEUE_HEAD_MAX_PKT_LEN_POS)
98 | EP_QUEUE_HEAD_IOS;
99
100 ep->dqh->next_dtd_ptr = EP_QUEUE_HEAD_NEXT_TERMINATE;
101
102 epctrlx = readl(&udc->op_regs->epctrlx[0]);
103 if (i) { /* TX */
104 epctrlx |= EPCTRL_TX_ENABLE
105 | (USB_ENDPOINT_XFER_CONTROL
106 << EPCTRL_TX_EP_TYPE_SHIFT);
107
108 } else { /* RX */
109 epctrlx |= EPCTRL_RX_ENABLE
110 | (USB_ENDPOINT_XFER_CONTROL
111 << EPCTRL_RX_EP_TYPE_SHIFT);
112 }
113
114 writel(epctrlx, &udc->op_regs->epctrlx[0]);
115 }
116 }
117
118 /* protocol ep0 stall, will automatically be cleared on new transaction */
119 static void ep0_stall(struct mv_udc *udc)
120 {
121 u32 epctrlx;
122
123 /* set TX and RX to stall */
124 epctrlx = readl(&udc->op_regs->epctrlx[0]);
125 epctrlx |= EPCTRL_RX_EP_STALL | EPCTRL_TX_EP_STALL;
126 writel(epctrlx, &udc->op_regs->epctrlx[0]);
127
128 /* update ep0 state */
129 udc->ep0_state = WAIT_FOR_SETUP;
130 udc->ep0_dir = EP_DIR_OUT;
131 }
132
133 static int process_ep_req(struct mv_udc *udc, int index,
134 struct mv_req *curr_req)
135 {
136 struct mv_dtd *curr_dtd;
137 struct mv_dqh *curr_dqh;
138 int td_complete, actual, remaining_length;
139 int i, direction;
140 int retval = 0;
141 u32 errors;
142 u32 bit_pos;
143
144 curr_dqh = &udc->ep_dqh[index];
145 direction = index % 2;
146
147 curr_dtd = curr_req->head;
148 td_complete = 0;
149 actual = curr_req->req.length;
150
151 for (i = 0; i < curr_req->dtd_count; i++) {
152 if (curr_dtd->size_ioc_sts & DTD_STATUS_ACTIVE) {
153 dev_dbg(&udc->dev->dev, "%s, dTD not completed\n",
154 udc->eps[index].name);
155 return 1;
156 }
157
158 errors = curr_dtd->size_ioc_sts & DTD_ERROR_MASK;
159 if (!errors) {
160 remaining_length =
161 (curr_dtd->size_ioc_sts & DTD_PACKET_SIZE)
162 >> DTD_LENGTH_BIT_POS;
163 actual -= remaining_length;
164
165 if (remaining_length) {
166 if (direction) {
167 dev_dbg(&udc->dev->dev,
168 "TX dTD remains data\n");
169 retval = -EPROTO;
170 break;
171 } else
172 break;
173 }
174 } else {
175 dev_info(&udc->dev->dev,
176 "complete_tr error: ep=%d %s: error = 0x%x\n",
177 index >> 1, direction ? "SEND" : "RECV",
178 errors);
179 if (errors & DTD_STATUS_HALTED) {
180 /* Clear the errors and Halt condition */
181 curr_dqh->size_ioc_int_sts &= ~errors;
182 retval = -EPIPE;
183 } else if (errors & DTD_STATUS_DATA_BUFF_ERR) {
184 retval = -EPROTO;
185 } else if (errors & DTD_STATUS_TRANSACTION_ERR) {
186 retval = -EILSEQ;
187 }
188 }
189 if (i != curr_req->dtd_count - 1)
190 curr_dtd = (struct mv_dtd *)curr_dtd->next_dtd_virt;
191 }
192 if (retval)
193 return retval;
194
195 if (direction == EP_DIR_OUT)
196 bit_pos = 1 << curr_req->ep->ep_num;
197 else
198 bit_pos = 1 << (16 + curr_req->ep->ep_num);
199
200 while ((curr_dqh->curr_dtd_ptr == curr_dtd->td_dma)) {
201 if (curr_dtd->dtd_next == EP_QUEUE_HEAD_NEXT_TERMINATE) {
202 while (readl(&udc->op_regs->epstatus) & bit_pos)
203 udelay(1);
204 break;
205 }
206 udelay(1);
207 }
208
209 curr_req->req.actual = actual;
210
211 return 0;
212 }
213
214 /*
215 * done() - retire a request; caller blocked irqs
216 * @status : request status to be set, only works when
217 * request is still in progress.
218 */
219 static void done(struct mv_ep *ep, struct mv_req *req, int status)
220 {
221 struct mv_udc *udc = NULL;
222 unsigned char stopped = ep->stopped;
223 struct mv_dtd *curr_td, *next_td;
224 int j;
225
226 udc = (struct mv_udc *)ep->udc;
227 /* Removed the req from fsl_ep->queue */
228 list_del_init(&req->queue);
229
230 /* req.status should be set as -EINPROGRESS in ep_queue() */
231 if (req->req.status == -EINPROGRESS)
232 req->req.status = status;
233 else
234 status = req->req.status;
235
236 /* Free dtd for the request */
237 next_td = req->head;
238 for (j = 0; j < req->dtd_count; j++) {
239 curr_td = next_td;
240 if (j != req->dtd_count - 1)
241 next_td = curr_td->next_dtd_virt;
242 dma_pool_free(udc->dtd_pool, curr_td, curr_td->td_dma);
243 }
244
245 if (req->mapped) {
246 dma_unmap_single(ep->udc->gadget.dev.parent,
247 req->req.dma, req->req.length,
248 ((ep_dir(ep) == EP_DIR_IN) ?
249 DMA_TO_DEVICE : DMA_FROM_DEVICE));
250 req->req.dma = DMA_ADDR_INVALID;
251 req->mapped = 0;
252 } else
253 dma_sync_single_for_cpu(ep->udc->gadget.dev.parent,
254 req->req.dma, req->req.length,
255 ((ep_dir(ep) == EP_DIR_IN) ?
256 DMA_TO_DEVICE : DMA_FROM_DEVICE));
257
258 if (status && (status != -ESHUTDOWN))
259 dev_info(&udc->dev->dev, "complete %s req %p stat %d len %u/%u",
260 ep->ep.name, &req->req, status,
261 req->req.actual, req->req.length);
262
263 ep->stopped = 1;
264
265 spin_unlock(&ep->udc->lock);
266 /*
267 * complete() is from gadget layer,
268 * eg fsg->bulk_in_complete()
269 */
270 if (req->req.complete)
271 req->req.complete(&ep->ep, &req->req);
272
273 spin_lock(&ep->udc->lock);
274 ep->stopped = stopped;
275 }
276
277 static int queue_dtd(struct mv_ep *ep, struct mv_req *req)
278 {
279 u32 tmp, epstatus, bit_pos, direction;
280 struct mv_udc *udc;
281 struct mv_dqh *dqh;
282 unsigned int loops;
283 int readsafe, retval = 0;
284
285 udc = ep->udc;
286 direction = ep_dir(ep);
287 dqh = &(udc->ep_dqh[ep->ep_num * 2 + direction]);
288 bit_pos = 1 << (((direction == EP_DIR_OUT) ? 0 : 16) + ep->ep_num);
289
290 /* check if the pipe is empty */
291 if (!(list_empty(&ep->queue))) {
292 struct mv_req *lastreq;
293 lastreq = list_entry(ep->queue.prev, struct mv_req, queue);
294 lastreq->tail->dtd_next =
295 req->head->td_dma & EP_QUEUE_HEAD_NEXT_POINTER_MASK;
296 if (readl(&udc->op_regs->epprime) & bit_pos) {
297 loops = LOOPS(PRIME_TIMEOUT);
298 while (readl(&udc->op_regs->epprime) & bit_pos) {
299 if (loops == 0) {
300 retval = -ETIME;
301 goto done;
302 }
303 udelay(LOOPS_USEC);
304 loops--;
305 }
306 if (readl(&udc->op_regs->epstatus) & bit_pos)
307 goto done;
308 }
309 readsafe = 0;
310 loops = LOOPS(READSAFE_TIMEOUT);
311 while (readsafe == 0) {
312 if (loops == 0) {
313 retval = -ETIME;
314 goto done;
315 }
316 /* start with setting the semaphores */
317 tmp = readl(&udc->op_regs->usbcmd);
318 tmp |= USBCMD_ATDTW_TRIPWIRE_SET;
319 writel(tmp, &udc->op_regs->usbcmd);
320
321 /* read the endpoint status */
322 epstatus = readl(&udc->op_regs->epstatus) & bit_pos;
323
324 /*
325 * Reread the ATDTW semaphore bit to check if it is
326 * cleared. When hardware see a hazard, it will clear
327 * the bit or else we remain set to 1 and we can
328 * proceed with priming of endpoint if not already
329 * primed.
330 */
331 if (readl(&udc->op_regs->usbcmd)
332 & USBCMD_ATDTW_TRIPWIRE_SET) {
333 readsafe = 1;
334 }
335 loops--;
336 udelay(LOOPS_USEC);
337 }
338
339 /* Clear the semaphore */
340 tmp = readl(&udc->op_regs->usbcmd);
341 tmp &= USBCMD_ATDTW_TRIPWIRE_CLEAR;
342 writel(tmp, &udc->op_regs->usbcmd);
343
344 /* If endpoint is not active, we activate it now. */
345 if (!epstatus) {
346 if (direction == EP_DIR_IN) {
347 struct mv_dtd *curr_dtd = dma_to_virt(
348 &udc->dev->dev, dqh->curr_dtd_ptr);
349
350 loops = LOOPS(DTD_TIMEOUT);
351 while (curr_dtd->size_ioc_sts
352 & DTD_STATUS_ACTIVE) {
353 if (loops == 0) {
354 retval = -ETIME;
355 goto done;
356 }
357 loops--;
358 udelay(LOOPS_USEC);
359 }
360 }
361 /* No other transfers on the queue */
362
363 /* Write dQH next pointer and terminate bit to 0 */
364 dqh->next_dtd_ptr = req->head->td_dma
365 & EP_QUEUE_HEAD_NEXT_POINTER_MASK;
366 dqh->size_ioc_int_sts = 0;
367
368 /*
369 * Ensure that updates to the QH will
370 * occur before priming.
371 */
372 wmb();
373
374 /* Prime the Endpoint */
375 writel(bit_pos, &udc->op_regs->epprime);
376 }
377 } else {
378 /* Write dQH next pointer and terminate bit to 0 */
379 dqh->next_dtd_ptr = req->head->td_dma
380 & EP_QUEUE_HEAD_NEXT_POINTER_MASK;
381 dqh->size_ioc_int_sts = 0;
382
383 /* Ensure that updates to the QH will occur before priming. */
384 wmb();
385
386 /* Prime the Endpoint */
387 writel(bit_pos, &udc->op_regs->epprime);
388
389 if (direction == EP_DIR_IN) {
390 /* FIXME add status check after prime the IN ep */
391 int prime_again;
392 u32 curr_dtd_ptr = dqh->curr_dtd_ptr;
393
394 loops = LOOPS(DTD_TIMEOUT);
395 prime_again = 0;
396 while ((curr_dtd_ptr != req->head->td_dma)) {
397 curr_dtd_ptr = dqh->curr_dtd_ptr;
398 if (loops == 0) {
399 dev_err(&udc->dev->dev,
400 "failed to prime %s\n",
401 ep->name);
402 retval = -ETIME;
403 goto done;
404 }
405 loops--;
406 udelay(LOOPS_USEC);
407
408 if (loops == (LOOPS(DTD_TIMEOUT) >> 2)) {
409 if (prime_again)
410 goto done;
411 dev_info(&udc->dev->dev,
412 "prime again\n");
413 writel(bit_pos,
414 &udc->op_regs->epprime);
415 prime_again = 1;
416 }
417 }
418 }
419 }
420 done:
421 return retval;
422 }
423
424 static struct mv_dtd *build_dtd(struct mv_req *req, unsigned *length,
425 dma_addr_t *dma, int *is_last)
426 {
427 u32 temp;
428 struct mv_dtd *dtd;
429 struct mv_udc *udc;
430
431 /* how big will this transfer be? */
432 *length = min(req->req.length - req->req.actual,
433 (unsigned)EP_MAX_LENGTH_TRANSFER);
434
435 udc = req->ep->udc;
436
437 /*
438 * Be careful that no _GFP_HIGHMEM is set,
439 * or we can not use dma_to_virt
440 */
441 dtd = dma_pool_alloc(udc->dtd_pool, GFP_KERNEL, dma);
442 if (dtd == NULL)
443 return dtd;
444
445 dtd->td_dma = *dma;
446 /* initialize buffer page pointers */
447 temp = (u32)(req->req.dma + req->req.actual);
448 dtd->buff_ptr0 = cpu_to_le32(temp);
449 temp &= ~0xFFF;
450 dtd->buff_ptr1 = cpu_to_le32(temp + 0x1000);
451 dtd->buff_ptr2 = cpu_to_le32(temp + 0x2000);
452 dtd->buff_ptr3 = cpu_to_le32(temp + 0x3000);
453 dtd->buff_ptr4 = cpu_to_le32(temp + 0x4000);
454
455 req->req.actual += *length;
456
457 /* zlp is needed if req->req.zero is set */
458 if (req->req.zero) {
459 if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0)
460 *is_last = 1;
461 else
462 *is_last = 0;
463 } else if (req->req.length == req->req.actual)
464 *is_last = 1;
465 else
466 *is_last = 0;
467
468 /* Fill in the transfer size; set active bit */
469 temp = ((*length << DTD_LENGTH_BIT_POS) | DTD_STATUS_ACTIVE);
470
471 /* Enable interrupt for the last dtd of a request */
472 if (*is_last && !req->req.no_interrupt)
473 temp |= DTD_IOC;
474
475 dtd->size_ioc_sts = temp;
476
477 mb();
478
479 return dtd;
480 }
481
482 /* generate dTD linked list for a request */
483 static int req_to_dtd(struct mv_req *req)
484 {
485 unsigned count;
486 int is_last, is_first = 1;
487 struct mv_dtd *dtd, *last_dtd = NULL;
488 struct mv_udc *udc;
489 dma_addr_t dma;
490
491 udc = req->ep->udc;
492
493 do {
494 dtd = build_dtd(req, &count, &dma, &is_last);
495 if (dtd == NULL)
496 return -ENOMEM;
497
498 if (is_first) {
499 is_first = 0;
500 req->head = dtd;
501 } else {
502 last_dtd->dtd_next = dma;
503 last_dtd->next_dtd_virt = dtd;
504 }
505 last_dtd = dtd;
506 req->dtd_count++;
507 } while (!is_last);
508
509 /* set terminate bit to 1 for the last dTD */
510 dtd->dtd_next = DTD_NEXT_TERMINATE;
511
512 req->tail = dtd;
513
514 return 0;
515 }
516
517 static int mv_ep_enable(struct usb_ep *_ep,
518 const struct usb_endpoint_descriptor *desc)
519 {
520 struct mv_udc *udc;
521 struct mv_ep *ep;
522 struct mv_dqh *dqh;
523 u16 max = 0;
524 u32 bit_pos, epctrlx, direction;
525 unsigned char zlt = 0, ios = 0, mult = 0;
526 unsigned long flags;
527
528 ep = container_of(_ep, struct mv_ep, ep);
529 udc = ep->udc;
530
531 if (!_ep || !desc || ep->desc
532 || desc->bDescriptorType != USB_DT_ENDPOINT)
533 return -EINVAL;
534
535 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
536 return -ESHUTDOWN;
537
538 direction = ep_dir(ep);
539 max = usb_endpoint_maxp(desc);
540
541 /*
542 * disable HW zero length termination select
543 * driver handles zero length packet through req->req.zero
544 */
545 zlt = 1;
546
547 bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num);
548
549 /* Check if the Endpoint is Primed */
550 if ((readl(&udc->op_regs->epprime) & bit_pos)
551 || (readl(&udc->op_regs->epstatus) & bit_pos)) {
552 dev_info(&udc->dev->dev,
553 "ep=%d %s: Init ERROR: ENDPTPRIME=0x%x,"
554 " ENDPTSTATUS=0x%x, bit_pos=0x%x\n",
555 (unsigned)ep->ep_num, direction ? "SEND" : "RECV",
556 (unsigned)readl(&udc->op_regs->epprime),
557 (unsigned)readl(&udc->op_regs->epstatus),
558 (unsigned)bit_pos);
559 goto en_done;
560 }
561 /* Set the max packet length, interrupt on Setup and Mult fields */
562 switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
563 case USB_ENDPOINT_XFER_BULK:
564 zlt = 1;
565 mult = 0;
566 break;
567 case USB_ENDPOINT_XFER_CONTROL:
568 ios = 1;
569 case USB_ENDPOINT_XFER_INT:
570 mult = 0;
571 break;
572 case USB_ENDPOINT_XFER_ISOC:
573 /* Calculate transactions needed for high bandwidth iso */
574 mult = (unsigned char)(1 + ((max >> 11) & 0x03));
575 max = max & 0x7ff; /* bit 0~10 */
576 /* 3 transactions at most */
577 if (mult > 3)
578 goto en_done;
579 break;
580 default:
581 goto en_done;
582 }
583
584 spin_lock_irqsave(&udc->lock, flags);
585 /* Get the endpoint queue head address */
586 dqh = ep->dqh;
587 dqh->max_packet_length = (max << EP_QUEUE_HEAD_MAX_PKT_LEN_POS)
588 | (mult << EP_QUEUE_HEAD_MULT_POS)
589 | (zlt ? EP_QUEUE_HEAD_ZLT_SEL : 0)
590 | (ios ? EP_QUEUE_HEAD_IOS : 0);
591 dqh->next_dtd_ptr = 1;
592 dqh->size_ioc_int_sts = 0;
593
594 ep->ep.maxpacket = max;
595 ep->desc = desc;
596 ep->stopped = 0;
597
598 /* Enable the endpoint for Rx or Tx and set the endpoint type */
599 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]);
600 if (direction == EP_DIR_IN) {
601 epctrlx &= ~EPCTRL_TX_ALL_MASK;
602 epctrlx |= EPCTRL_TX_ENABLE | EPCTRL_TX_DATA_TOGGLE_RST
603 | ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
604 << EPCTRL_TX_EP_TYPE_SHIFT);
605 } else {
606 epctrlx &= ~EPCTRL_RX_ALL_MASK;
607 epctrlx |= EPCTRL_RX_ENABLE | EPCTRL_RX_DATA_TOGGLE_RST
608 | ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
609 << EPCTRL_RX_EP_TYPE_SHIFT);
610 }
611 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]);
612
613 /*
614 * Implement Guideline (GL# USB-7) The unused endpoint type must
615 * be programmed to bulk.
616 */
617 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]);
618 if ((epctrlx & EPCTRL_RX_ENABLE) == 0) {
619 epctrlx |= (USB_ENDPOINT_XFER_BULK
620 << EPCTRL_RX_EP_TYPE_SHIFT);
621 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]);
622 }
623
624 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]);
625 if ((epctrlx & EPCTRL_TX_ENABLE) == 0) {
626 epctrlx |= (USB_ENDPOINT_XFER_BULK
627 << EPCTRL_TX_EP_TYPE_SHIFT);
628 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]);
629 }
630
631 spin_unlock_irqrestore(&udc->lock, flags);
632
633 return 0;
634 en_done:
635 return -EINVAL;
636 }
637
638 static int mv_ep_disable(struct usb_ep *_ep)
639 {
640 struct mv_udc *udc;
641 struct mv_ep *ep;
642 struct mv_dqh *dqh;
643 u32 bit_pos, epctrlx, direction;
644 unsigned long flags;
645
646 ep = container_of(_ep, struct mv_ep, ep);
647 if ((_ep == NULL) || !ep->desc)
648 return -EINVAL;
649
650 udc = ep->udc;
651
652 /* Get the endpoint queue head address */
653 dqh = ep->dqh;
654
655 spin_lock_irqsave(&udc->lock, flags);
656
657 direction = ep_dir(ep);
658 bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num);
659
660 /* Reset the max packet length and the interrupt on Setup */
661 dqh->max_packet_length = 0;
662
663 /* Disable the endpoint for Rx or Tx and reset the endpoint type */
664 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]);
665 epctrlx &= ~((direction == EP_DIR_IN)
666 ? (EPCTRL_TX_ENABLE | EPCTRL_TX_TYPE)
667 : (EPCTRL_RX_ENABLE | EPCTRL_RX_TYPE));
668 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]);
669
670 /* nuke all pending requests (does flush) */
671 nuke(ep, -ESHUTDOWN);
672
673 ep->desc = NULL;
674 ep->stopped = 1;
675
676 spin_unlock_irqrestore(&udc->lock, flags);
677
678 return 0;
679 }
680
681 static struct usb_request *
682 mv_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
683 {
684 struct mv_req *req = NULL;
685
686 req = kzalloc(sizeof *req, gfp_flags);
687 if (!req)
688 return NULL;
689
690 req->req.dma = DMA_ADDR_INVALID;
691 INIT_LIST_HEAD(&req->queue);
692
693 return &req->req;
694 }
695
696 static void mv_free_request(struct usb_ep *_ep, struct usb_request *_req)
697 {
698 struct mv_req *req = NULL;
699
700 req = container_of(_req, struct mv_req, req);
701
702 if (_req)
703 kfree(req);
704 }
705
706 static void mv_ep_fifo_flush(struct usb_ep *_ep)
707 {
708 struct mv_udc *udc;
709 u32 bit_pos, direction;
710 struct mv_ep *ep;
711 unsigned int loops;
712
713 if (!_ep)
714 return;
715
716 ep = container_of(_ep, struct mv_ep, ep);
717 if (!ep->desc)
718 return;
719
720 udc = ep->udc;
721 direction = ep_dir(ep);
722
723 if (ep->ep_num == 0)
724 bit_pos = (1 << 16) | 1;
725 else if (direction == EP_DIR_OUT)
726 bit_pos = 1 << ep->ep_num;
727 else
728 bit_pos = 1 << (16 + ep->ep_num);
729
730 loops = LOOPS(EPSTATUS_TIMEOUT);
731 do {
732 unsigned int inter_loops;
733
734 if (loops == 0) {
735 dev_err(&udc->dev->dev,
736 "TIMEOUT for ENDPTSTATUS=0x%x, bit_pos=0x%x\n",
737 (unsigned)readl(&udc->op_regs->epstatus),
738 (unsigned)bit_pos);
739 return;
740 }
741 /* Write 1 to the Flush register */
742 writel(bit_pos, &udc->op_regs->epflush);
743
744 /* Wait until flushing completed */
745 inter_loops = LOOPS(FLUSH_TIMEOUT);
746 while (readl(&udc->op_regs->epflush)) {
747 /*
748 * ENDPTFLUSH bit should be cleared to indicate this
749 * operation is complete
750 */
751 if (inter_loops == 0) {
752 dev_err(&udc->dev->dev,
753 "TIMEOUT for ENDPTFLUSH=0x%x,"
754 "bit_pos=0x%x\n",
755 (unsigned)readl(&udc->op_regs->epflush),
756 (unsigned)bit_pos);
757 return;
758 }
759 inter_loops--;
760 udelay(LOOPS_USEC);
761 }
762 loops--;
763 } while (readl(&udc->op_regs->epstatus) & bit_pos);
764 }
765
766 /* queues (submits) an I/O request to an endpoint */
767 static int
768 mv_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
769 {
770 struct mv_ep *ep = container_of(_ep, struct mv_ep, ep);
771 struct mv_req *req = container_of(_req, struct mv_req, req);
772 struct mv_udc *udc = ep->udc;
773 unsigned long flags;
774
775 /* catch various bogus parameters */
776 if (!_req || !req->req.complete || !req->req.buf
777 || !list_empty(&req->queue)) {
778 dev_err(&udc->dev->dev, "%s, bad params", __func__);
779 return -EINVAL;
780 }
781 if (unlikely(!_ep || !ep->desc)) {
782 dev_err(&udc->dev->dev, "%s, bad ep", __func__);
783 return -EINVAL;
784 }
785 if (ep->desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
786 if (req->req.length > ep->ep.maxpacket)
787 return -EMSGSIZE;
788 }
789
790 udc = ep->udc;
791 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
792 return -ESHUTDOWN;
793
794 req->ep = ep;
795
796 /* map virtual address to hardware */
797 if (req->req.dma == DMA_ADDR_INVALID) {
798 req->req.dma = dma_map_single(ep->udc->gadget.dev.parent,
799 req->req.buf,
800 req->req.length, ep_dir(ep)
801 ? DMA_TO_DEVICE
802 : DMA_FROM_DEVICE);
803 req->mapped = 1;
804 } else {
805 dma_sync_single_for_device(ep->udc->gadget.dev.parent,
806 req->req.dma, req->req.length,
807 ep_dir(ep)
808 ? DMA_TO_DEVICE
809 : DMA_FROM_DEVICE);
810 req->mapped = 0;
811 }
812
813 req->req.status = -EINPROGRESS;
814 req->req.actual = 0;
815 req->dtd_count = 0;
816
817 spin_lock_irqsave(&udc->lock, flags);
818
819 /* build dtds and push them to device queue */
820 if (!req_to_dtd(req)) {
821 int retval;
822 retval = queue_dtd(ep, req);
823 if (retval) {
824 spin_unlock_irqrestore(&udc->lock, flags);
825 return retval;
826 }
827 } else {
828 spin_unlock_irqrestore(&udc->lock, flags);
829 return -ENOMEM;
830 }
831
832 /* Update ep0 state */
833 if (ep->ep_num == 0)
834 udc->ep0_state = DATA_STATE_XMIT;
835
836 /* irq handler advances the queue */
837 if (req != NULL)
838 list_add_tail(&req->queue, &ep->queue);
839 spin_unlock_irqrestore(&udc->lock, flags);
840
841 return 0;
842 }
843
844 /* dequeues (cancels, unlinks) an I/O request from an endpoint */
845 static int mv_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
846 {
847 struct mv_ep *ep = container_of(_ep, struct mv_ep, ep);
848 struct mv_req *req;
849 struct mv_udc *udc = ep->udc;
850 unsigned long flags;
851 int stopped, ret = 0;
852 u32 epctrlx;
853
854 if (!_ep || !_req)
855 return -EINVAL;
856
857 spin_lock_irqsave(&ep->udc->lock, flags);
858 stopped = ep->stopped;
859
860 /* Stop the ep before we deal with the queue */
861 ep->stopped = 1;
862 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]);
863 if (ep_dir(ep) == EP_DIR_IN)
864 epctrlx &= ~EPCTRL_TX_ENABLE;
865 else
866 epctrlx &= ~EPCTRL_RX_ENABLE;
867 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]);
868
869 /* make sure it's actually queued on this endpoint */
870 list_for_each_entry(req, &ep->queue, queue) {
871 if (&req->req == _req)
872 break;
873 }
874 if (&req->req != _req) {
875 ret = -EINVAL;
876 goto out;
877 }
878
879 /* The request is in progress, or completed but not dequeued */
880 if (ep->queue.next == &req->queue) {
881 _req->status = -ECONNRESET;
882 mv_ep_fifo_flush(_ep); /* flush current transfer */
883
884 /* The request isn't the last request in this ep queue */
885 if (req->queue.next != &ep->queue) {
886 struct mv_dqh *qh;
887 struct mv_req *next_req;
888
889 qh = ep->dqh;
890 next_req = list_entry(req->queue.next, struct mv_req,
891 queue);
892
893 /* Point the QH to the first TD of next request */
894 writel((u32) next_req->head, &qh->curr_dtd_ptr);
895 } else {
896 struct mv_dqh *qh;
897
898 qh = ep->dqh;
899 qh->next_dtd_ptr = 1;
900 qh->size_ioc_int_sts = 0;
901 }
902
903 /* The request hasn't been processed, patch up the TD chain */
904 } else {
905 struct mv_req *prev_req;
906
907 prev_req = list_entry(req->queue.prev, struct mv_req, queue);
908 writel(readl(&req->tail->dtd_next),
909 &prev_req->tail->dtd_next);
910
911 }
912
913 done(ep, req, -ECONNRESET);
914
915 /* Enable EP */
916 out:
917 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]);
918 if (ep_dir(ep) == EP_DIR_IN)
919 epctrlx |= EPCTRL_TX_ENABLE;
920 else
921 epctrlx |= EPCTRL_RX_ENABLE;
922 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]);
923 ep->stopped = stopped;
924
925 spin_unlock_irqrestore(&ep->udc->lock, flags);
926 return ret;
927 }
928
929 static void ep_set_stall(struct mv_udc *udc, u8 ep_num, u8 direction, int stall)
930 {
931 u32 epctrlx;
932
933 epctrlx = readl(&udc->op_regs->epctrlx[ep_num]);
934
935 if (stall) {
936 if (direction == EP_DIR_IN)
937 epctrlx |= EPCTRL_TX_EP_STALL;
938 else
939 epctrlx |= EPCTRL_RX_EP_STALL;
940 } else {
941 if (direction == EP_DIR_IN) {
942 epctrlx &= ~EPCTRL_TX_EP_STALL;
943 epctrlx |= EPCTRL_TX_DATA_TOGGLE_RST;
944 } else {
945 epctrlx &= ~EPCTRL_RX_EP_STALL;
946 epctrlx |= EPCTRL_RX_DATA_TOGGLE_RST;
947 }
948 }
949 writel(epctrlx, &udc->op_regs->epctrlx[ep_num]);
950 }
951
952 static int ep_is_stall(struct mv_udc *udc, u8 ep_num, u8 direction)
953 {
954 u32 epctrlx;
955
956 epctrlx = readl(&udc->op_regs->epctrlx[ep_num]);
957
958 if (direction == EP_DIR_OUT)
959 return (epctrlx & EPCTRL_RX_EP_STALL) ? 1 : 0;
960 else
961 return (epctrlx & EPCTRL_TX_EP_STALL) ? 1 : 0;
962 }
963
964 static int mv_ep_set_halt_wedge(struct usb_ep *_ep, int halt, int wedge)
965 {
966 struct mv_ep *ep;
967 unsigned long flags = 0;
968 int status = 0;
969 struct mv_udc *udc;
970
971 ep = container_of(_ep, struct mv_ep, ep);
972 udc = ep->udc;
973 if (!_ep || !ep->desc) {
974 status = -EINVAL;
975 goto out;
976 }
977
978 if (ep->desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
979 status = -EOPNOTSUPP;
980 goto out;
981 }
982
983 /*
984 * Attempt to halt IN ep will fail if any transfer requests
985 * are still queue
986 */
987 if (halt && (ep_dir(ep) == EP_DIR_IN) && !list_empty(&ep->queue)) {
988 status = -EAGAIN;
989 goto out;
990 }
991
992 spin_lock_irqsave(&ep->udc->lock, flags);
993 ep_set_stall(udc, ep->ep_num, ep_dir(ep), halt);
994 if (halt && wedge)
995 ep->wedge = 1;
996 else if (!halt)
997 ep->wedge = 0;
998 spin_unlock_irqrestore(&ep->udc->lock, flags);
999
1000 if (ep->ep_num == 0) {
1001 udc->ep0_state = WAIT_FOR_SETUP;
1002 udc->ep0_dir = EP_DIR_OUT;
1003 }
1004 out:
1005 return status;
1006 }
1007
1008 static int mv_ep_set_halt(struct usb_ep *_ep, int halt)
1009 {
1010 return mv_ep_set_halt_wedge(_ep, halt, 0);
1011 }
1012
1013 static int mv_ep_set_wedge(struct usb_ep *_ep)
1014 {
1015 return mv_ep_set_halt_wedge(_ep, 1, 1);
1016 }
1017
1018 static struct usb_ep_ops mv_ep_ops = {
1019 .enable = mv_ep_enable,
1020 .disable = mv_ep_disable,
1021
1022 .alloc_request = mv_alloc_request,
1023 .free_request = mv_free_request,
1024
1025 .queue = mv_ep_queue,
1026 .dequeue = mv_ep_dequeue,
1027
1028 .set_wedge = mv_ep_set_wedge,
1029 .set_halt = mv_ep_set_halt,
1030 .fifo_flush = mv_ep_fifo_flush, /* flush fifo */
1031 };
1032
1033 static void udc_clock_enable(struct mv_udc *udc)
1034 {
1035 unsigned int i;
1036
1037 for (i = 0; i < udc->clknum; i++)
1038 clk_enable(udc->clk[i]);
1039 }
1040
1041 static void udc_clock_disable(struct mv_udc *udc)
1042 {
1043 unsigned int i;
1044
1045 for (i = 0; i < udc->clknum; i++)
1046 clk_disable(udc->clk[i]);
1047 }
1048
1049 static void udc_stop(struct mv_udc *udc)
1050 {
1051 u32 tmp;
1052
1053 /* Disable interrupts */
1054 tmp = readl(&udc->op_regs->usbintr);
1055 tmp &= ~(USBINTR_INT_EN | USBINTR_ERR_INT_EN |
1056 USBINTR_PORT_CHANGE_DETECT_EN | USBINTR_RESET_EN);
1057 writel(tmp, &udc->op_regs->usbintr);
1058
1059 /* Reset the Run the bit in the command register to stop VUSB */
1060 tmp = readl(&udc->op_regs->usbcmd);
1061 tmp &= ~USBCMD_RUN_STOP;
1062 writel(tmp, &udc->op_regs->usbcmd);
1063 }
1064
1065 static void udc_start(struct mv_udc *udc)
1066 {
1067 u32 usbintr;
1068
1069 usbintr = USBINTR_INT_EN | USBINTR_ERR_INT_EN
1070 | USBINTR_PORT_CHANGE_DETECT_EN
1071 | USBINTR_RESET_EN | USBINTR_DEVICE_SUSPEND;
1072 /* Enable interrupts */
1073 writel(usbintr, &udc->op_regs->usbintr);
1074
1075 /* Set the Run bit in the command register */
1076 writel(USBCMD_RUN_STOP, &udc->op_regs->usbcmd);
1077 }
1078
1079 static int udc_reset(struct mv_udc *udc)
1080 {
1081 unsigned int loops;
1082 u32 tmp, portsc;
1083
1084 /* Stop the controller */
1085 tmp = readl(&udc->op_regs->usbcmd);
1086 tmp &= ~USBCMD_RUN_STOP;
1087 writel(tmp, &udc->op_regs->usbcmd);
1088
1089 /* Reset the controller to get default values */
1090 writel(USBCMD_CTRL_RESET, &udc->op_regs->usbcmd);
1091
1092 /* wait for reset to complete */
1093 loops = LOOPS(RESET_TIMEOUT);
1094 while (readl(&udc->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
1095 if (loops == 0) {
1096 dev_err(&udc->dev->dev,
1097 "Wait for RESET completed TIMEOUT\n");
1098 return -ETIMEDOUT;
1099 }
1100 loops--;
1101 udelay(LOOPS_USEC);
1102 }
1103
1104 /* set controller to device mode */
1105 tmp = readl(&udc->op_regs->usbmode);
1106 tmp |= USBMODE_CTRL_MODE_DEVICE;
1107
1108 /* turn setup lockout off, require setup tripwire in usbcmd */
1109 tmp |= USBMODE_SETUP_LOCK_OFF | USBMODE_STREAM_DISABLE;
1110
1111 writel(tmp, &udc->op_regs->usbmode);
1112
1113 writel(0x0, &udc->op_regs->epsetupstat);
1114
1115 /* Configure the Endpoint List Address */
1116 writel(udc->ep_dqh_dma & USB_EP_LIST_ADDRESS_MASK,
1117 &udc->op_regs->eplistaddr);
1118
1119 portsc = readl(&udc->op_regs->portsc[0]);
1120 if (readl(&udc->cap_regs->hcsparams) & HCSPARAMS_PPC)
1121 portsc &= (~PORTSCX_W1C_BITS | ~PORTSCX_PORT_POWER);
1122
1123 if (udc->force_fs)
1124 portsc |= PORTSCX_FORCE_FULL_SPEED_CONNECT;
1125 else
1126 portsc &= (~PORTSCX_FORCE_FULL_SPEED_CONNECT);
1127
1128 writel(portsc, &udc->op_regs->portsc[0]);
1129
1130 tmp = readl(&udc->op_regs->epctrlx[0]);
1131 tmp &= ~(EPCTRL_TX_EP_STALL | EPCTRL_RX_EP_STALL);
1132 writel(tmp, &udc->op_regs->epctrlx[0]);
1133
1134 return 0;
1135 }
1136
1137 static int mv_udc_enable(struct mv_udc *udc)
1138 {
1139 int retval;
1140
1141 if (udc->clock_gating == 0 || udc->active)
1142 return 0;
1143
1144 dev_dbg(&udc->dev->dev, "enable udc\n");
1145 udc_clock_enable(udc);
1146 if (udc->pdata->phy_init) {
1147 retval = udc->pdata->phy_init(udc->phy_regs);
1148 if (retval) {
1149 dev_err(&udc->dev->dev,
1150 "init phy error %d\n", retval);
1151 udc_clock_disable(udc);
1152 return retval;
1153 }
1154 }
1155 udc->active = 1;
1156
1157 return 0;
1158 }
1159
1160 static void mv_udc_disable(struct mv_udc *udc)
1161 {
1162 if (udc->clock_gating && udc->active) {
1163 dev_dbg(&udc->dev->dev, "disable udc\n");
1164 if (udc->pdata->phy_deinit)
1165 udc->pdata->phy_deinit(udc->phy_regs);
1166 udc_clock_disable(udc);
1167 udc->active = 0;
1168 }
1169 }
1170
1171 static int mv_udc_get_frame(struct usb_gadget *gadget)
1172 {
1173 struct mv_udc *udc;
1174 u16 retval;
1175
1176 if (!gadget)
1177 return -ENODEV;
1178
1179 udc = container_of(gadget, struct mv_udc, gadget);
1180
1181 retval = readl(udc->op_regs->frindex) & USB_FRINDEX_MASKS;
1182
1183 return retval;
1184 }
1185
1186 /* Tries to wake up the host connected to this gadget */
1187 static int mv_udc_wakeup(struct usb_gadget *gadget)
1188 {
1189 struct mv_udc *udc = container_of(gadget, struct mv_udc, gadget);
1190 u32 portsc;
1191
1192 /* Remote wakeup feature not enabled by host */
1193 if (!udc->remote_wakeup)
1194 return -ENOTSUPP;
1195
1196 portsc = readl(&udc->op_regs->portsc);
1197 /* not suspended? */
1198 if (!(portsc & PORTSCX_PORT_SUSPEND))
1199 return 0;
1200 /* trigger force resume */
1201 portsc |= PORTSCX_PORT_FORCE_RESUME;
1202 writel(portsc, &udc->op_regs->portsc[0]);
1203 return 0;
1204 }
1205
1206 static int mv_udc_vbus_session(struct usb_gadget *gadget, int is_active)
1207 {
1208 struct mv_udc *udc;
1209 unsigned long flags;
1210 int retval = 0;
1211
1212 udc = container_of(gadget, struct mv_udc, gadget);
1213 spin_lock_irqsave(&udc->lock, flags);
1214
1215 dev_dbg(&udc->dev->dev, "%s: softconnect %d, vbus_active %d\n",
1216 __func__, udc->softconnect, udc->vbus_active);
1217
1218 udc->vbus_active = (is_active != 0);
1219 if (udc->driver && udc->softconnect && udc->vbus_active) {
1220 retval = mv_udc_enable(udc);
1221 if (retval == 0) {
1222 /* Clock is disabled, need re-init registers */
1223 udc_reset(udc);
1224 ep0_reset(udc);
1225 udc_start(udc);
1226 }
1227 } else if (udc->driver && udc->softconnect) {
1228 /* stop all the transfer in queue*/
1229 stop_activity(udc, udc->driver);
1230 udc_stop(udc);
1231 mv_udc_disable(udc);
1232 }
1233
1234 spin_unlock_irqrestore(&udc->lock, flags);
1235 return retval;
1236 }
1237
1238 static int mv_udc_pullup(struct usb_gadget *gadget, int is_on)
1239 {
1240 struct mv_udc *udc;
1241 unsigned long flags;
1242 int retval = 0;
1243
1244 udc = container_of(gadget, struct mv_udc, gadget);
1245 spin_lock_irqsave(&udc->lock, flags);
1246
1247 dev_dbg(&udc->dev->dev, "%s: softconnect %d, vbus_active %d\n",
1248 __func__, udc->softconnect, udc->vbus_active);
1249
1250 udc->softconnect = (is_on != 0);
1251 if (udc->driver && udc->softconnect && udc->vbus_active) {
1252 retval = mv_udc_enable(udc);
1253 if (retval == 0) {
1254 /* Clock is disabled, need re-init registers */
1255 udc_reset(udc);
1256 ep0_reset(udc);
1257 udc_start(udc);
1258 }
1259 } else if (udc->driver && udc->vbus_active) {
1260 /* stop all the transfer in queue*/
1261 stop_activity(udc, udc->driver);
1262 udc_stop(udc);
1263 mv_udc_disable(udc);
1264 }
1265
1266 spin_unlock_irqrestore(&udc->lock, flags);
1267 return retval;
1268 }
1269
1270 static int mv_udc_start(struct usb_gadget_driver *driver,
1271 int (*bind)(struct usb_gadget *));
1272 static int mv_udc_stop(struct usb_gadget_driver *driver);
1273 /* device controller usb_gadget_ops structure */
1274 static const struct usb_gadget_ops mv_ops = {
1275
1276 /* returns the current frame number */
1277 .get_frame = mv_udc_get_frame,
1278
1279 /* tries to wake up the host connected to this gadget */
1280 .wakeup = mv_udc_wakeup,
1281
1282 /* notify controller that VBUS is powered or not */
1283 .vbus_session = mv_udc_vbus_session,
1284
1285 /* D+ pullup, software-controlled connect/disconnect to USB host */
1286 .pullup = mv_udc_pullup,
1287 .start = mv_udc_start,
1288 .stop = mv_udc_stop,
1289 };
1290
1291 static int eps_init(struct mv_udc *udc)
1292 {
1293 struct mv_ep *ep;
1294 char name[14];
1295 int i;
1296
1297 /* initialize ep0 */
1298 ep = &udc->eps[0];
1299 ep->udc = udc;
1300 strncpy(ep->name, "ep0", sizeof(ep->name));
1301 ep->ep.name = ep->name;
1302 ep->ep.ops = &mv_ep_ops;
1303 ep->wedge = 0;
1304 ep->stopped = 0;
1305 ep->ep.maxpacket = EP0_MAX_PKT_SIZE;
1306 ep->ep_num = 0;
1307 ep->desc = &mv_ep0_desc;
1308 INIT_LIST_HEAD(&ep->queue);
1309
1310 ep->ep_type = USB_ENDPOINT_XFER_CONTROL;
1311
1312 /* initialize other endpoints */
1313 for (i = 2; i < udc->max_eps * 2; i++) {
1314 ep = &udc->eps[i];
1315 if (i % 2) {
1316 snprintf(name, sizeof(name), "ep%din", i / 2);
1317 ep->direction = EP_DIR_IN;
1318 } else {
1319 snprintf(name, sizeof(name), "ep%dout", i / 2);
1320 ep->direction = EP_DIR_OUT;
1321 }
1322 ep->udc = udc;
1323 strncpy(ep->name, name, sizeof(ep->name));
1324 ep->ep.name = ep->name;
1325
1326 ep->ep.ops = &mv_ep_ops;
1327 ep->stopped = 0;
1328 ep->ep.maxpacket = (unsigned short) ~0;
1329 ep->ep_num = i / 2;
1330
1331 INIT_LIST_HEAD(&ep->queue);
1332 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1333
1334 ep->dqh = &udc->ep_dqh[i];
1335 }
1336
1337 return 0;
1338 }
1339
1340 /* delete all endpoint requests, called with spinlock held */
1341 static void nuke(struct mv_ep *ep, int status)
1342 {
1343 /* called with spinlock held */
1344 ep->stopped = 1;
1345
1346 /* endpoint fifo flush */
1347 mv_ep_fifo_flush(&ep->ep);
1348
1349 while (!list_empty(&ep->queue)) {
1350 struct mv_req *req = NULL;
1351 req = list_entry(ep->queue.next, struct mv_req, queue);
1352 done(ep, req, status);
1353 }
1354 }
1355
1356 /* stop all USB activities */
1357 static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver)
1358 {
1359 struct mv_ep *ep;
1360
1361 nuke(&udc->eps[0], -ESHUTDOWN);
1362
1363 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1364 nuke(ep, -ESHUTDOWN);
1365 }
1366
1367 /* report disconnect; the driver is already quiesced */
1368 if (driver) {
1369 spin_unlock(&udc->lock);
1370 driver->disconnect(&udc->gadget);
1371 spin_lock(&udc->lock);
1372 }
1373 }
1374
1375 static int mv_udc_start(struct usb_gadget_driver *driver,
1376 int (*bind)(struct usb_gadget *))
1377 {
1378 struct mv_udc *udc = the_controller;
1379 int retval = 0;
1380 unsigned long flags;
1381
1382 if (!udc)
1383 return -ENODEV;
1384
1385 if (udc->driver)
1386 return -EBUSY;
1387
1388 spin_lock_irqsave(&udc->lock, flags);
1389
1390 /* hook up the driver ... */
1391 driver->driver.bus = NULL;
1392 udc->driver = driver;
1393 udc->gadget.dev.driver = &driver->driver;
1394
1395 udc->usb_state = USB_STATE_ATTACHED;
1396 udc->ep0_state = WAIT_FOR_SETUP;
1397 udc->ep0_dir = EP_DIR_OUT;
1398
1399 spin_unlock_irqrestore(&udc->lock, flags);
1400
1401 retval = bind(&udc->gadget);
1402 if (retval) {
1403 dev_err(&udc->dev->dev, "bind to driver %s --> %d\n",
1404 driver->driver.name, retval);
1405 udc->driver = NULL;
1406 udc->gadget.dev.driver = NULL;
1407 return retval;
1408 }
1409
1410 /* pullup is always on */
1411 mv_udc_pullup(&udc->gadget, 1);
1412
1413 /* When boot with cable attached, there will be no vbus irq occurred */
1414 if (udc->qwork)
1415 queue_work(udc->qwork, &udc->vbus_work);
1416
1417 return 0;
1418 }
1419
1420 static int mv_udc_stop(struct usb_gadget_driver *driver)
1421 {
1422 struct mv_udc *udc = the_controller;
1423 unsigned long flags;
1424
1425 if (!udc)
1426 return -ENODEV;
1427
1428 spin_lock_irqsave(&udc->lock, flags);
1429
1430 mv_udc_enable(udc);
1431 udc_stop(udc);
1432
1433 /* stop all usb activities */
1434 udc->gadget.speed = USB_SPEED_UNKNOWN;
1435 stop_activity(udc, driver);
1436 mv_udc_disable(udc);
1437
1438 spin_unlock_irqrestore(&udc->lock, flags);
1439
1440 /* unbind gadget driver */
1441 driver->unbind(&udc->gadget);
1442 udc->gadget.dev.driver = NULL;
1443 udc->driver = NULL;
1444
1445 return 0;
1446 }
1447
1448 static void mv_set_ptc(struct mv_udc *udc, u32 mode)
1449 {
1450 u32 portsc;
1451
1452 portsc = readl(&udc->op_regs->portsc[0]);
1453 portsc |= mode << 16;
1454 writel(portsc, &udc->op_regs->portsc[0]);
1455 }
1456
1457 static void prime_status_complete(struct usb_ep *ep, struct usb_request *_req)
1458 {
1459 struct mv_udc *udc = the_controller;
1460 struct mv_req *req = container_of(_req, struct mv_req, req);
1461 unsigned long flags;
1462
1463 dev_info(&udc->dev->dev, "switch to test mode %d\n", req->test_mode);
1464
1465 spin_lock_irqsave(&udc->lock, flags);
1466 if (req->test_mode) {
1467 mv_set_ptc(udc, req->test_mode);
1468 req->test_mode = 0;
1469 }
1470 spin_unlock_irqrestore(&udc->lock, flags);
1471 }
1472
1473 static int
1474 udc_prime_status(struct mv_udc *udc, u8 direction, u16 status, bool empty)
1475 {
1476 int retval = 0;
1477 struct mv_req *req;
1478 struct mv_ep *ep;
1479
1480 ep = &udc->eps[0];
1481 udc->ep0_dir = direction;
1482 udc->ep0_state = WAIT_FOR_OUT_STATUS;
1483
1484 req = udc->status_req;
1485
1486 /* fill in the reqest structure */
1487 if (empty == false) {
1488 *((u16 *) req->req.buf) = cpu_to_le16(status);
1489 req->req.length = 2;
1490 } else
1491 req->req.length = 0;
1492
1493 req->ep = ep;
1494 req->req.status = -EINPROGRESS;
1495 req->req.actual = 0;
1496 if (udc->test_mode) {
1497 req->req.complete = prime_status_complete;
1498 req->test_mode = udc->test_mode;
1499 udc->test_mode = 0;
1500 } else
1501 req->req.complete = NULL;
1502 req->dtd_count = 0;
1503
1504 if (req->req.dma == DMA_ADDR_INVALID) {
1505 req->req.dma = dma_map_single(ep->udc->gadget.dev.parent,
1506 req->req.buf, req->req.length,
1507 ep_dir(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1508 req->mapped = 1;
1509 }
1510
1511 /* prime the data phase */
1512 if (!req_to_dtd(req))
1513 retval = queue_dtd(ep, req);
1514 else{ /* no mem */
1515 retval = -ENOMEM;
1516 goto out;
1517 }
1518
1519 if (retval) {
1520 dev_err(&udc->dev->dev, "response error on GET_STATUS request\n");
1521 goto out;
1522 }
1523
1524 list_add_tail(&req->queue, &ep->queue);
1525
1526 return 0;
1527 out:
1528 return retval;
1529 }
1530
1531 static void mv_udc_testmode(struct mv_udc *udc, u16 index)
1532 {
1533 if (index <= TEST_FORCE_EN) {
1534 udc->test_mode = index;
1535 if (udc_prime_status(udc, EP_DIR_IN, 0, true))
1536 ep0_stall(udc);
1537 } else
1538 dev_err(&udc->dev->dev,
1539 "This test mode(%d) is not supported\n", index);
1540 }
1541
1542 static void ch9setaddress(struct mv_udc *udc, struct usb_ctrlrequest *setup)
1543 {
1544 udc->dev_addr = (u8)setup->wValue;
1545
1546 /* update usb state */
1547 udc->usb_state = USB_STATE_ADDRESS;
1548
1549 if (udc_prime_status(udc, EP_DIR_IN, 0, true))
1550 ep0_stall(udc);
1551 }
1552
1553 static void ch9getstatus(struct mv_udc *udc, u8 ep_num,
1554 struct usb_ctrlrequest *setup)
1555 {
1556 u16 status = 0;
1557 int retval;
1558
1559 if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK))
1560 != (USB_DIR_IN | USB_TYPE_STANDARD))
1561 return;
1562
1563 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
1564 status = 1 << USB_DEVICE_SELF_POWERED;
1565 status |= udc->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP;
1566 } else if ((setup->bRequestType & USB_RECIP_MASK)
1567 == USB_RECIP_INTERFACE) {
1568 /* get interface status */
1569 status = 0;
1570 } else if ((setup->bRequestType & USB_RECIP_MASK)
1571 == USB_RECIP_ENDPOINT) {
1572 u8 ep_num, direction;
1573
1574 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK;
1575 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK)
1576 ? EP_DIR_IN : EP_DIR_OUT;
1577 status = ep_is_stall(udc, ep_num, direction)
1578 << USB_ENDPOINT_HALT;
1579 }
1580
1581 retval = udc_prime_status(udc, EP_DIR_IN, status, false);
1582 if (retval)
1583 ep0_stall(udc);
1584 else
1585 udc->ep0_state = DATA_STATE_XMIT;
1586 }
1587
1588 static void ch9clearfeature(struct mv_udc *udc, struct usb_ctrlrequest *setup)
1589 {
1590 u8 ep_num;
1591 u8 direction;
1592 struct mv_ep *ep;
1593
1594 if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK))
1595 == ((USB_TYPE_STANDARD | USB_RECIP_DEVICE))) {
1596 switch (setup->wValue) {
1597 case USB_DEVICE_REMOTE_WAKEUP:
1598 udc->remote_wakeup = 0;
1599 break;
1600 default:
1601 goto out;
1602 }
1603 } else if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK))
1604 == ((USB_TYPE_STANDARD | USB_RECIP_ENDPOINT))) {
1605 switch (setup->wValue) {
1606 case USB_ENDPOINT_HALT:
1607 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK;
1608 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK)
1609 ? EP_DIR_IN : EP_DIR_OUT;
1610 if (setup->wValue != 0 || setup->wLength != 0
1611 || ep_num > udc->max_eps)
1612 goto out;
1613 ep = &udc->eps[ep_num * 2 + direction];
1614 if (ep->wedge == 1)
1615 break;
1616 spin_unlock(&udc->lock);
1617 ep_set_stall(udc, ep_num, direction, 0);
1618 spin_lock(&udc->lock);
1619 break;
1620 default:
1621 goto out;
1622 }
1623 } else
1624 goto out;
1625
1626 if (udc_prime_status(udc, EP_DIR_IN, 0, true))
1627 ep0_stall(udc);
1628 out:
1629 return;
1630 }
1631
1632 static void ch9setfeature(struct mv_udc *udc, struct usb_ctrlrequest *setup)
1633 {
1634 u8 ep_num;
1635 u8 direction;
1636
1637 if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK))
1638 == ((USB_TYPE_STANDARD | USB_RECIP_DEVICE))) {
1639 switch (setup->wValue) {
1640 case USB_DEVICE_REMOTE_WAKEUP:
1641 udc->remote_wakeup = 1;
1642 break;
1643 case USB_DEVICE_TEST_MODE:
1644 if (setup->wIndex & 0xFF
1645 || udc->gadget.speed != USB_SPEED_HIGH)
1646 ep0_stall(udc);
1647
1648 if (udc->usb_state != USB_STATE_CONFIGURED
1649 && udc->usb_state != USB_STATE_ADDRESS
1650 && udc->usb_state != USB_STATE_DEFAULT)
1651 ep0_stall(udc);
1652
1653 mv_udc_testmode(udc, (setup->wIndex >> 8));
1654 goto out;
1655 default:
1656 goto out;
1657 }
1658 } else if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK))
1659 == ((USB_TYPE_STANDARD | USB_RECIP_ENDPOINT))) {
1660 switch (setup->wValue) {
1661 case USB_ENDPOINT_HALT:
1662 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK;
1663 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK)
1664 ? EP_DIR_IN : EP_DIR_OUT;
1665 if (setup->wValue != 0 || setup->wLength != 0
1666 || ep_num > udc->max_eps)
1667 goto out;
1668 spin_unlock(&udc->lock);
1669 ep_set_stall(udc, ep_num, direction, 1);
1670 spin_lock(&udc->lock);
1671 break;
1672 default:
1673 goto out;
1674 }
1675 } else
1676 goto out;
1677
1678 if (udc_prime_status(udc, EP_DIR_IN, 0, true))
1679 ep0_stall(udc);
1680 out:
1681 return;
1682 }
1683
1684 static void handle_setup_packet(struct mv_udc *udc, u8 ep_num,
1685 struct usb_ctrlrequest *setup)
1686 {
1687 bool delegate = false;
1688
1689 nuke(&udc->eps[ep_num * 2 + EP_DIR_OUT], -ESHUTDOWN);
1690
1691 dev_dbg(&udc->dev->dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1692 setup->bRequestType, setup->bRequest,
1693 setup->wValue, setup->wIndex, setup->wLength);
1694 /* We process some stardard setup requests here */
1695 if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1696 switch (setup->bRequest) {
1697 case USB_REQ_GET_STATUS:
1698 ch9getstatus(udc, ep_num, setup);
1699 break;
1700
1701 case USB_REQ_SET_ADDRESS:
1702 ch9setaddress(udc, setup);
1703 break;
1704
1705 case USB_REQ_CLEAR_FEATURE:
1706 ch9clearfeature(udc, setup);
1707 break;
1708
1709 case USB_REQ_SET_FEATURE:
1710 ch9setfeature(udc, setup);
1711 break;
1712
1713 default:
1714 delegate = true;
1715 }
1716 } else
1717 delegate = true;
1718
1719 /* delegate USB standard requests to the gadget driver */
1720 if (delegate == true) {
1721 /* USB requests handled by gadget */
1722 if (setup->wLength) {
1723 /* DATA phase from gadget, STATUS phase from udc */
1724 udc->ep0_dir = (setup->bRequestType & USB_DIR_IN)
1725 ? EP_DIR_IN : EP_DIR_OUT;
1726 spin_unlock(&udc->lock);
1727 if (udc->driver->setup(&udc->gadget,
1728 &udc->local_setup_buff) < 0)
1729 ep0_stall(udc);
1730 spin_lock(&udc->lock);
1731 udc->ep0_state = (setup->bRequestType & USB_DIR_IN)
1732 ? DATA_STATE_XMIT : DATA_STATE_RECV;
1733 } else {
1734 /* no DATA phase, IN STATUS phase from gadget */
1735 udc->ep0_dir = EP_DIR_IN;
1736 spin_unlock(&udc->lock);
1737 if (udc->driver->setup(&udc->gadget,
1738 &udc->local_setup_buff) < 0)
1739 ep0_stall(udc);
1740 spin_lock(&udc->lock);
1741 udc->ep0_state = WAIT_FOR_OUT_STATUS;
1742 }
1743 }
1744 }
1745
1746 /* complete DATA or STATUS phase of ep0 prime status phase if needed */
1747 static void ep0_req_complete(struct mv_udc *udc,
1748 struct mv_ep *ep0, struct mv_req *req)
1749 {
1750 u32 new_addr;
1751
1752 if (udc->usb_state == USB_STATE_ADDRESS) {
1753 /* set the new address */
1754 new_addr = (u32)udc->dev_addr;
1755 writel(new_addr << USB_DEVICE_ADDRESS_BIT_SHIFT,
1756 &udc->op_regs->deviceaddr);
1757 }
1758
1759 done(ep0, req, 0);
1760
1761 switch (udc->ep0_state) {
1762 case DATA_STATE_XMIT:
1763 /* receive status phase */
1764 if (udc_prime_status(udc, EP_DIR_OUT, 0, true))
1765 ep0_stall(udc);
1766 break;
1767 case DATA_STATE_RECV:
1768 /* send status phase */
1769 if (udc_prime_status(udc, EP_DIR_IN, 0 , true))
1770 ep0_stall(udc);
1771 break;
1772 case WAIT_FOR_OUT_STATUS:
1773 udc->ep0_state = WAIT_FOR_SETUP;
1774 break;
1775 case WAIT_FOR_SETUP:
1776 dev_err(&udc->dev->dev, "unexpect ep0 packets\n");
1777 break;
1778 default:
1779 ep0_stall(udc);
1780 break;
1781 }
1782 }
1783
1784 static void get_setup_data(struct mv_udc *udc, u8 ep_num, u8 *buffer_ptr)
1785 {
1786 u32 temp;
1787 struct mv_dqh *dqh;
1788
1789 dqh = &udc->ep_dqh[ep_num * 2 + EP_DIR_OUT];
1790
1791 /* Clear bit in ENDPTSETUPSTAT */
1792 writel((1 << ep_num), &udc->op_regs->epsetupstat);
1793
1794 /* while a hazard exists when setup package arrives */
1795 do {
1796 /* Set Setup Tripwire */
1797 temp = readl(&udc->op_regs->usbcmd);
1798 writel(temp | USBCMD_SETUP_TRIPWIRE_SET, &udc->op_regs->usbcmd);
1799
1800 /* Copy the setup packet to local buffer */
1801 memcpy(buffer_ptr, (u8 *) dqh->setup_buffer, 8);
1802 } while (!(readl(&udc->op_regs->usbcmd) & USBCMD_SETUP_TRIPWIRE_SET));
1803
1804 /* Clear Setup Tripwire */
1805 temp = readl(&udc->op_regs->usbcmd);
1806 writel(temp & ~USBCMD_SETUP_TRIPWIRE_SET, &udc->op_regs->usbcmd);
1807 }
1808
1809 static void irq_process_tr_complete(struct mv_udc *udc)
1810 {
1811 u32 tmp, bit_pos;
1812 int i, ep_num = 0, direction = 0;
1813 struct mv_ep *curr_ep;
1814 struct mv_req *curr_req, *temp_req;
1815 int status;
1816
1817 /*
1818 * We use separate loops for ENDPTSETUPSTAT and ENDPTCOMPLETE
1819 * because the setup packets are to be read ASAP
1820 */
1821
1822 /* Process all Setup packet received interrupts */
1823 tmp = readl(&udc->op_regs->epsetupstat);
1824
1825 if (tmp) {
1826 for (i = 0; i < udc->max_eps; i++) {
1827 if (tmp & (1 << i)) {
1828 get_setup_data(udc, i,
1829 (u8 *)(&udc->local_setup_buff));
1830 handle_setup_packet(udc, i,
1831 &udc->local_setup_buff);
1832 }
1833 }
1834 }
1835
1836 /* Don't clear the endpoint setup status register here.
1837 * It is cleared as a setup packet is read out of the buffer
1838 */
1839
1840 /* Process non-setup transaction complete interrupts */
1841 tmp = readl(&udc->op_regs->epcomplete);
1842
1843 if (!tmp)
1844 return;
1845
1846 writel(tmp, &udc->op_regs->epcomplete);
1847
1848 for (i = 0; i < udc->max_eps * 2; i++) {
1849 ep_num = i >> 1;
1850 direction = i % 2;
1851
1852 bit_pos = 1 << (ep_num + 16 * direction);
1853
1854 if (!(bit_pos & tmp))
1855 continue;
1856
1857 if (i == 1)
1858 curr_ep = &udc->eps[0];
1859 else
1860 curr_ep = &udc->eps[i];
1861 /* process the req queue until an uncomplete request */
1862 list_for_each_entry_safe(curr_req, temp_req,
1863 &curr_ep->queue, queue) {
1864 status = process_ep_req(udc, i, curr_req);
1865 if (status)
1866 break;
1867
1868 /* write back status to req */
1869 curr_req->req.status = status;
1870
1871 /* ep0 request completion */
1872 if (ep_num == 0) {
1873 ep0_req_complete(udc, curr_ep, curr_req);
1874 break;
1875 } else {
1876 done(curr_ep, curr_req, status);
1877 }
1878 }
1879 }
1880 }
1881
1882 void irq_process_reset(struct mv_udc *udc)
1883 {
1884 u32 tmp;
1885 unsigned int loops;
1886
1887 udc->ep0_dir = EP_DIR_OUT;
1888 udc->ep0_state = WAIT_FOR_SETUP;
1889 udc->remote_wakeup = 0; /* default to 0 on reset */
1890
1891 /* The address bits are past bit 25-31. Set the address */
1892 tmp = readl(&udc->op_regs->deviceaddr);
1893 tmp &= ~(USB_DEVICE_ADDRESS_MASK);
1894 writel(tmp, &udc->op_regs->deviceaddr);
1895
1896 /* Clear all the setup token semaphores */
1897 tmp = readl(&udc->op_regs->epsetupstat);
1898 writel(tmp, &udc->op_regs->epsetupstat);
1899
1900 /* Clear all the endpoint complete status bits */
1901 tmp = readl(&udc->op_regs->epcomplete);
1902 writel(tmp, &udc->op_regs->epcomplete);
1903
1904 /* wait until all endptprime bits cleared */
1905 loops = LOOPS(PRIME_TIMEOUT);
1906 while (readl(&udc->op_regs->epprime) & 0xFFFFFFFF) {
1907 if (loops == 0) {
1908 dev_err(&udc->dev->dev,
1909 "Timeout for ENDPTPRIME = 0x%x\n",
1910 readl(&udc->op_regs->epprime));
1911 break;
1912 }
1913 loops--;
1914 udelay(LOOPS_USEC);
1915 }
1916
1917 /* Write 1s to the Flush register */
1918 writel((u32)~0, &udc->op_regs->epflush);
1919
1920 if (readl(&udc->op_regs->portsc[0]) & PORTSCX_PORT_RESET) {
1921 dev_info(&udc->dev->dev, "usb bus reset\n");
1922 udc->usb_state = USB_STATE_DEFAULT;
1923 /* reset all the queues, stop all USB activities */
1924 stop_activity(udc, udc->driver);
1925 } else {
1926 dev_info(&udc->dev->dev, "USB reset portsc 0x%x\n",
1927 readl(&udc->op_regs->portsc));
1928
1929 /*
1930 * re-initialize
1931 * controller reset
1932 */
1933 udc_reset(udc);
1934
1935 /* reset all the queues, stop all USB activities */
1936 stop_activity(udc, udc->driver);
1937
1938 /* reset ep0 dQH and endptctrl */
1939 ep0_reset(udc);
1940
1941 /* enable interrupt and set controller to run state */
1942 udc_start(udc);
1943
1944 udc->usb_state = USB_STATE_ATTACHED;
1945 }
1946 }
1947
1948 static void handle_bus_resume(struct mv_udc *udc)
1949 {
1950 udc->usb_state = udc->resume_state;
1951 udc->resume_state = 0;
1952
1953 /* report resume to the driver */
1954 if (udc->driver) {
1955 if (udc->driver->resume) {
1956 spin_unlock(&udc->lock);
1957 udc->driver->resume(&udc->gadget);
1958 spin_lock(&udc->lock);
1959 }
1960 }
1961 }
1962
1963 static void irq_process_suspend(struct mv_udc *udc)
1964 {
1965 udc->resume_state = udc->usb_state;
1966 udc->usb_state = USB_STATE_SUSPENDED;
1967
1968 if (udc->driver->suspend) {
1969 spin_unlock(&udc->lock);
1970 udc->driver->suspend(&udc->gadget);
1971 spin_lock(&udc->lock);
1972 }
1973 }
1974
1975 static void irq_process_port_change(struct mv_udc *udc)
1976 {
1977 u32 portsc;
1978
1979 portsc = readl(&udc->op_regs->portsc[0]);
1980 if (!(portsc & PORTSCX_PORT_RESET)) {
1981 /* Get the speed */
1982 u32 speed = portsc & PORTSCX_PORT_SPEED_MASK;
1983 switch (speed) {
1984 case PORTSCX_PORT_SPEED_HIGH:
1985 udc->gadget.speed = USB_SPEED_HIGH;
1986 break;
1987 case PORTSCX_PORT_SPEED_FULL:
1988 udc->gadget.speed = USB_SPEED_FULL;
1989 break;
1990 case PORTSCX_PORT_SPEED_LOW:
1991 udc->gadget.speed = USB_SPEED_LOW;
1992 break;
1993 default:
1994 udc->gadget.speed = USB_SPEED_UNKNOWN;
1995 break;
1996 }
1997 }
1998
1999 if (portsc & PORTSCX_PORT_SUSPEND) {
2000 udc->resume_state = udc->usb_state;
2001 udc->usb_state = USB_STATE_SUSPENDED;
2002 if (udc->driver->suspend) {
2003 spin_unlock(&udc->lock);
2004 udc->driver->suspend(&udc->gadget);
2005 spin_lock(&udc->lock);
2006 }
2007 }
2008
2009 if (!(portsc & PORTSCX_PORT_SUSPEND)
2010 && udc->usb_state == USB_STATE_SUSPENDED) {
2011 handle_bus_resume(udc);
2012 }
2013
2014 if (!udc->resume_state)
2015 udc->usb_state = USB_STATE_DEFAULT;
2016 }
2017
2018 static void irq_process_error(struct mv_udc *udc)
2019 {
2020 /* Increment the error count */
2021 udc->errors++;
2022 }
2023
2024 static irqreturn_t mv_udc_irq(int irq, void *dev)
2025 {
2026 struct mv_udc *udc = (struct mv_udc *)dev;
2027 u32 status, intr;
2028
2029 spin_lock(&udc->lock);
2030
2031 status = readl(&udc->op_regs->usbsts);
2032 intr = readl(&udc->op_regs->usbintr);
2033 status &= intr;
2034
2035 if (status == 0) {
2036 spin_unlock(&udc->lock);
2037 return IRQ_NONE;
2038 }
2039
2040 /* Clear all the interrupts occurred */
2041 writel(status, &udc->op_regs->usbsts);
2042
2043 if (status & USBSTS_ERR)
2044 irq_process_error(udc);
2045
2046 if (status & USBSTS_RESET)
2047 irq_process_reset(udc);
2048
2049 if (status & USBSTS_PORT_CHANGE)
2050 irq_process_port_change(udc);
2051
2052 if (status & USBSTS_INT)
2053 irq_process_tr_complete(udc);
2054
2055 if (status & USBSTS_SUSPEND)
2056 irq_process_suspend(udc);
2057
2058 spin_unlock(&udc->lock);
2059
2060 return IRQ_HANDLED;
2061 }
2062
2063 static irqreturn_t mv_udc_vbus_irq(int irq, void *dev)
2064 {
2065 struct mv_udc *udc = (struct mv_udc *)dev;
2066
2067 /* polling VBUS and init phy may cause too much time*/
2068 if (udc->qwork)
2069 queue_work(udc->qwork, &udc->vbus_work);
2070
2071 return IRQ_HANDLED;
2072 }
2073
2074 static void mv_udc_vbus_work(struct work_struct *work)
2075 {
2076 struct mv_udc *udc;
2077 unsigned int vbus;
2078
2079 udc = container_of(work, struct mv_udc, vbus_work);
2080 if (!udc->pdata->vbus)
2081 return;
2082
2083 vbus = udc->pdata->vbus->poll();
2084 dev_info(&udc->dev->dev, "vbus is %d\n", vbus);
2085
2086 if (vbus == VBUS_HIGH)
2087 mv_udc_vbus_session(&udc->gadget, 1);
2088 else if (vbus == VBUS_LOW)
2089 mv_udc_vbus_session(&udc->gadget, 0);
2090 }
2091
2092 /* release device structure */
2093 static void gadget_release(struct device *_dev)
2094 {
2095 struct mv_udc *udc = the_controller;
2096
2097 complete(udc->done);
2098 }
2099
2100 static int __devexit mv_udc_remove(struct platform_device *dev)
2101 {
2102 struct mv_udc *udc = the_controller;
2103 int clk_i;
2104
2105 usb_del_gadget_udc(&udc->gadget);
2106
2107 if (udc->qwork) {
2108 flush_workqueue(udc->qwork);
2109 destroy_workqueue(udc->qwork);
2110 }
2111
2112 if (udc->pdata && udc->pdata->vbus && udc->clock_gating)
2113 free_irq(udc->pdata->vbus->irq, &dev->dev);
2114
2115 /* free memory allocated in probe */
2116 if (udc->dtd_pool)
2117 dma_pool_destroy(udc->dtd_pool);
2118
2119 if (udc->ep_dqh)
2120 dma_free_coherent(&dev->dev, udc->ep_dqh_size,
2121 udc->ep_dqh, udc->ep_dqh_dma);
2122
2123 kfree(udc->eps);
2124
2125 if (udc->irq)
2126 free_irq(udc->irq, &dev->dev);
2127
2128 mv_udc_disable(udc);
2129
2130 if (udc->cap_regs)
2131 iounmap(udc->cap_regs);
2132 udc->cap_regs = NULL;
2133
2134 if (udc->phy_regs)
2135 iounmap((void *)udc->phy_regs);
2136 udc->phy_regs = 0;
2137
2138 if (udc->status_req) {
2139 kfree(udc->status_req->req.buf);
2140 kfree(udc->status_req);
2141 }
2142
2143 for (clk_i = 0; clk_i <= udc->clknum; clk_i++)
2144 clk_put(udc->clk[clk_i]);
2145
2146 device_unregister(&udc->gadget.dev);
2147
2148 /* free dev, wait for the release() finished */
2149 wait_for_completion(udc->done);
2150 kfree(udc);
2151
2152 the_controller = NULL;
2153
2154 return 0;
2155 }
2156
2157 static int __devinit mv_udc_probe(struct platform_device *dev)
2158 {
2159 struct mv_usb_platform_data *pdata = dev->dev.platform_data;
2160 struct mv_udc *udc;
2161 int retval = 0;
2162 int clk_i = 0;
2163 struct resource *r;
2164 size_t size;
2165
2166 if (pdata == NULL) {
2167 dev_err(&dev->dev, "missing platform_data\n");
2168 return -ENODEV;
2169 }
2170
2171 size = sizeof(*udc) + sizeof(struct clk *) * pdata->clknum;
2172 udc = kzalloc(size, GFP_KERNEL);
2173 if (udc == NULL) {
2174 dev_err(&dev->dev, "failed to allocate memory for udc\n");
2175 return -ENOMEM;
2176 }
2177
2178 the_controller = udc;
2179 udc->done = &release_done;
2180 udc->pdata = dev->dev.platform_data;
2181 spin_lock_init(&udc->lock);
2182
2183 udc->dev = dev;
2184
2185 udc->clknum = pdata->clknum;
2186 for (clk_i = 0; clk_i < udc->clknum; clk_i++) {
2187 udc->clk[clk_i] = clk_get(&dev->dev, pdata->clkname[clk_i]);
2188 if (IS_ERR(udc->clk[clk_i])) {
2189 retval = PTR_ERR(udc->clk[clk_i]);
2190 goto err_put_clk;
2191 }
2192 }
2193
2194 r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "capregs");
2195 if (r == NULL) {
2196 dev_err(&dev->dev, "no I/O memory resource defined\n");
2197 retval = -ENODEV;
2198 goto err_put_clk;
2199 }
2200
2201 udc->cap_regs = (struct mv_cap_regs __iomem *)
2202 ioremap(r->start, resource_size(r));
2203 if (udc->cap_regs == NULL) {
2204 dev_err(&dev->dev, "failed to map I/O memory\n");
2205 retval = -EBUSY;
2206 goto err_put_clk;
2207 }
2208
2209 r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "phyregs");
2210 if (r == NULL) {
2211 dev_err(&dev->dev, "no phy I/O memory resource defined\n");
2212 retval = -ENODEV;
2213 goto err_iounmap_capreg;
2214 }
2215
2216 udc->phy_regs = (unsigned int)ioremap(r->start, resource_size(r));
2217 if (udc->phy_regs == 0) {
2218 dev_err(&dev->dev, "failed to map phy I/O memory\n");
2219 retval = -EBUSY;
2220 goto err_iounmap_capreg;
2221 }
2222
2223 /* we will acces controller register, so enable the clk */
2224 udc_clock_enable(udc);
2225 if (pdata->phy_init) {
2226 retval = pdata->phy_init(udc->phy_regs);
2227 if (retval) {
2228 dev_err(&dev->dev, "phy init error %d\n", retval);
2229 goto err_iounmap_phyreg;
2230 }
2231 }
2232
2233 udc->op_regs = (struct mv_op_regs __iomem *)((u32)udc->cap_regs
2234 + (readl(&udc->cap_regs->caplength_hciversion)
2235 & CAPLENGTH_MASK));
2236 udc->max_eps = readl(&udc->cap_regs->dccparams) & DCCPARAMS_DEN_MASK;
2237
2238 /*
2239 * some platform will use usb to download image, it may not disconnect
2240 * usb gadget before loading kernel. So first stop udc here.
2241 */
2242 udc_stop(udc);
2243 writel(0xFFFFFFFF, &udc->op_regs->usbsts);
2244
2245 size = udc->max_eps * sizeof(struct mv_dqh) *2;
2246 size = (size + DQH_ALIGNMENT - 1) & ~(DQH_ALIGNMENT - 1);
2247 udc->ep_dqh = dma_alloc_coherent(&dev->dev, size,
2248 &udc->ep_dqh_dma, GFP_KERNEL);
2249
2250 if (udc->ep_dqh == NULL) {
2251 dev_err(&dev->dev, "allocate dQH memory failed\n");
2252 retval = -ENOMEM;
2253 goto err_disable_clock;
2254 }
2255 udc->ep_dqh_size = size;
2256
2257 /* create dTD dma_pool resource */
2258 udc->dtd_pool = dma_pool_create("mv_dtd",
2259 &dev->dev,
2260 sizeof(struct mv_dtd),
2261 DTD_ALIGNMENT,
2262 DMA_BOUNDARY);
2263
2264 if (!udc->dtd_pool) {
2265 retval = -ENOMEM;
2266 goto err_free_dma;
2267 }
2268
2269 size = udc->max_eps * sizeof(struct mv_ep) *2;
2270 udc->eps = kzalloc(size, GFP_KERNEL);
2271 if (udc->eps == NULL) {
2272 dev_err(&dev->dev, "allocate ep memory failed\n");
2273 retval = -ENOMEM;
2274 goto err_destroy_dma;
2275 }
2276
2277 /* initialize ep0 status request structure */
2278 udc->status_req = kzalloc(sizeof(struct mv_req), GFP_KERNEL);
2279 if (!udc->status_req) {
2280 dev_err(&dev->dev, "allocate status_req memory failed\n");
2281 retval = -ENOMEM;
2282 goto err_free_eps;
2283 }
2284 INIT_LIST_HEAD(&udc->status_req->queue);
2285
2286 /* allocate a small amount of memory to get valid address */
2287 udc->status_req->req.buf = kzalloc(8, GFP_KERNEL);
2288 udc->status_req->req.dma = DMA_ADDR_INVALID;
2289
2290 udc->resume_state = USB_STATE_NOTATTACHED;
2291 udc->usb_state = USB_STATE_POWERED;
2292 udc->ep0_dir = EP_DIR_OUT;
2293 udc->remote_wakeup = 0;
2294
2295 r = platform_get_resource(udc->dev, IORESOURCE_IRQ, 0);
2296 if (r == NULL) {
2297 dev_err(&dev->dev, "no IRQ resource defined\n");
2298 retval = -ENODEV;
2299 goto err_free_status_req;
2300 }
2301 udc->irq = r->start;
2302 if (request_irq(udc->irq, mv_udc_irq,
2303 IRQF_SHARED, driver_name, udc)) {
2304 dev_err(&dev->dev, "Request irq %d for UDC failed\n",
2305 udc->irq);
2306 retval = -ENODEV;
2307 goto err_free_status_req;
2308 }
2309
2310 /* initialize gadget structure */
2311 udc->gadget.ops = &mv_ops; /* usb_gadget_ops */
2312 udc->gadget.ep0 = &udc->eps[0].ep; /* gadget ep0 */
2313 INIT_LIST_HEAD(&udc->gadget.ep_list); /* ep_list */
2314 udc->gadget.speed = USB_SPEED_UNKNOWN; /* speed */
2315 udc->gadget.is_dualspeed = 1; /* support dual speed */
2316
2317 /* the "gadget" abstracts/virtualizes the controller */
2318 dev_set_name(&udc->gadget.dev, "gadget");
2319 udc->gadget.dev.parent = &dev->dev;
2320 udc->gadget.dev.dma_mask = dev->dev.dma_mask;
2321 udc->gadget.dev.release = gadget_release;
2322 udc->gadget.name = driver_name; /* gadget name */
2323
2324 retval = device_register(&udc->gadget.dev);
2325 if (retval)
2326 goto err_free_irq;
2327
2328 eps_init(udc);
2329
2330 /* VBUS detect: we can disable/enable clock on demand.*/
2331 if (pdata->vbus) {
2332 udc->clock_gating = 1;
2333 retval = request_threaded_irq(pdata->vbus->irq, NULL,
2334 mv_udc_vbus_irq, IRQF_ONESHOT, "vbus", udc);
2335 if (retval) {
2336 dev_info(&dev->dev,
2337 "Can not request irq for VBUS, "
2338 "disable clock gating\n");
2339 udc->clock_gating = 0;
2340 }
2341
2342 udc->qwork = create_singlethread_workqueue("mv_udc_queue");
2343 if (!udc->qwork) {
2344 dev_err(&dev->dev, "cannot create workqueue\n");
2345 retval = -ENOMEM;
2346 goto err_unregister;
2347 }
2348
2349 INIT_WORK(&udc->vbus_work, mv_udc_vbus_work);
2350 }
2351
2352 /*
2353 * When clock gating is supported, we can disable clk and phy.
2354 * If not, it means that VBUS detection is not supported, we
2355 * have to enable vbus active all the time to let controller work.
2356 */
2357 if (udc->clock_gating) {
2358 if (udc->pdata->phy_deinit)
2359 udc->pdata->phy_deinit(udc->phy_regs);
2360 udc_clock_disable(udc);
2361 } else
2362 udc->vbus_active = 1;
2363
2364 retval = usb_add_gadget_udc(&dev->dev, &udc->gadget);
2365 if (retval)
2366 goto err_unregister;
2367
2368 dev_info(&dev->dev, "successful probe UDC device %s clock gating.\n",
2369 udc->clock_gating ? "with" : "without");
2370
2371 return 0;
2372
2373 err_unregister:
2374 if (udc->pdata && udc->pdata->vbus && udc->clock_gating)
2375 free_irq(pdata->vbus->irq, &dev->dev);
2376 device_unregister(&udc->gadget.dev);
2377 err_free_irq:
2378 free_irq(udc->irq, &dev->dev);
2379 err_free_status_req:
2380 kfree(udc->status_req->req.buf);
2381 kfree(udc->status_req);
2382 err_free_eps:
2383 kfree(udc->eps);
2384 err_destroy_dma:
2385 dma_pool_destroy(udc->dtd_pool);
2386 err_free_dma:
2387 dma_free_coherent(&dev->dev, udc->ep_dqh_size,
2388 udc->ep_dqh, udc->ep_dqh_dma);
2389 err_disable_clock:
2390 if (udc->pdata->phy_deinit)
2391 udc->pdata->phy_deinit(udc->phy_regs);
2392 udc_clock_disable(udc);
2393 err_iounmap_phyreg:
2394 iounmap((void *)udc->phy_regs);
2395 err_iounmap_capreg:
2396 iounmap(udc->cap_regs);
2397 err_put_clk:
2398 for (clk_i--; clk_i >= 0; clk_i--)
2399 clk_put(udc->clk[clk_i]);
2400 the_controller = NULL;
2401 kfree(udc);
2402 return retval;
2403 }
2404
2405 #ifdef CONFIG_PM
2406 static int mv_udc_suspend(struct device *_dev)
2407 {
2408 struct mv_udc *udc = the_controller;
2409
2410 udc_stop(udc);
2411
2412 return 0;
2413 }
2414
2415 static int mv_udc_resume(struct device *_dev)
2416 {
2417 struct mv_udc *udc = the_controller;
2418 int retval;
2419
2420 if (udc->pdata->phy_init) {
2421 retval = udc->pdata->phy_init(udc->phy_regs);
2422 if (retval) {
2423 dev_err(&udc->dev->dev,
2424 "init phy error %d when resume back\n",
2425 retval);
2426 return retval;
2427 }
2428 }
2429
2430 udc_reset(udc);
2431 ep0_reset(udc);
2432 udc_start(udc);
2433
2434 return 0;
2435 }
2436
2437 static const struct dev_pm_ops mv_udc_pm_ops = {
2438 .suspend = mv_udc_suspend,
2439 .resume = mv_udc_resume,
2440 };
2441 #endif
2442
2443 static void mv_udc_shutdown(struct platform_device *dev)
2444 {
2445 struct mv_udc *udc = the_controller;
2446 u32 mode;
2447
2448 /* reset controller mode to IDLE */
2449 mode = readl(&udc->op_regs->usbmode);
2450 mode &= ~3;
2451 writel(mode, &udc->op_regs->usbmode);
2452 }
2453
2454 static struct platform_driver udc_driver = {
2455 .probe = mv_udc_probe,
2456 .remove = __exit_p(mv_udc_remove),
2457 .shutdown = mv_udc_shutdown,
2458 .driver = {
2459 .owner = THIS_MODULE,
2460 .name = "pxa-u2o",
2461 #ifdef CONFIG_PM
2462 .pm = &mv_udc_pm_ops,
2463 #endif
2464 },
2465 };
2466 MODULE_ALIAS("platform:pxa-u2o");
2467
2468 MODULE_DESCRIPTION(DRIVER_DESC);
2469 MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
2470 MODULE_VERSION(DRIVER_VERSION);
2471 MODULE_LICENSE("GPL");
2472
2473
2474 static int __init init(void)
2475 {
2476 return platform_driver_register(&udc_driver);
2477 }
2478 module_init(init);
2479
2480
2481 static void __exit cleanup(void)
2482 {
2483 platform_driver_unregister(&udc_driver);
2484 }
2485 module_exit(cleanup);
2486
kernel-based virtual machine