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doc: Update rcu_assign_pointer() definition in whatisRCU.txt
[linux/fpc-iii.git] / drivers / usb / gadget / udc / fotg210-udc.c
blob78d0204e3e20a5ef91e3c2e8988ae2f0c69f661c
1 /*
2 * FOTG210 UDC Driver supports Bulk transfer so far
3 *
4 * Copyright (C) 2013 Faraday Technology Corporation
5 *
6 * Author : Yuan-Hsin Chen <yhchen@faraday-tech.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
11 */
12
13 #include <linux/dma-mapping.h>
14 #include <linux/err.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/usb/ch9.h>
20 #include <linux/usb/gadget.h>
21
22 #include "fotg210.h"
23
24 #define DRIVER_DESC "FOTG210 USB Device Controller Driver"
25 #define DRIVER_VERSION "30-April-2013"
26
27 static const char udc_name[] = "fotg210_udc";
28 static const char * const fotg210_ep_name[] = {
29 "ep0", "ep1", "ep2", "ep3", "ep4"};
30
31 static void fotg210_disable_fifo_int(struct fotg210_ep *ep)
32 {
33 u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);
34
35 if (ep->dir_in)
36 value |= DMISGR1_MF_IN_INT(ep->epnum - 1);
37 else
38 value |= DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
39 iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
40 }
41
42 static void fotg210_enable_fifo_int(struct fotg210_ep *ep)
43 {
44 u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);
45
46 if (ep->dir_in)
47 value &= ~DMISGR1_MF_IN_INT(ep->epnum - 1);
48 else
49 value &= ~DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
50 iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
51 }
52
53 static void fotg210_set_cxdone(struct fotg210_udc *fotg210)
54 {
55 u32 value = ioread32(fotg210->reg + FOTG210_DCFESR);
56
57 value |= DCFESR_CX_DONE;
58 iowrite32(value, fotg210->reg + FOTG210_DCFESR);
59 }
60
61 static void fotg210_done(struct fotg210_ep *ep, struct fotg210_request *req,
62 int status)
63 {
64 list_del_init(&req->queue);
65
66 /* don't modify queue heads during completion callback */
67 if (ep->fotg210->gadget.speed == USB_SPEED_UNKNOWN)
68 req->req.status = -ESHUTDOWN;
69 else
70 req->req.status = status;
71
72 spin_unlock(&ep->fotg210->lock);
73 usb_gadget_giveback_request(&ep->ep, &req->req);
74 spin_lock(&ep->fotg210->lock);
75
76 if (ep->epnum) {
77 if (list_empty(&ep->queue))
78 fotg210_disable_fifo_int(ep);
79 } else {
80 fotg210_set_cxdone(ep->fotg210);
81 }
82 }
83
84 static void fotg210_fifo_ep_mapping(struct fotg210_ep *ep, u32 epnum,
85 u32 dir_in)
86 {
87 struct fotg210_udc *fotg210 = ep->fotg210;
88 u32 val;
89
90 /* Driver should map an ep to a fifo and then map the fifo
91 * to the ep. What a brain-damaged design!
92 */
93
94 /* map a fifo to an ep */
95 val = ioread32(fotg210->reg + FOTG210_EPMAP);
96 val &= ~EPMAP_FIFONOMSK(epnum, dir_in);
97 val |= EPMAP_FIFONO(epnum, dir_in);
98 iowrite32(val, fotg210->reg + FOTG210_EPMAP);
99
100 /* map the ep to the fifo */
101 val = ioread32(fotg210->reg + FOTG210_FIFOMAP);
102 val &= ~FIFOMAP_EPNOMSK(epnum);
103 val |= FIFOMAP_EPNO(epnum);
104 iowrite32(val, fotg210->reg + FOTG210_FIFOMAP);
105
106 /* enable fifo */
107 val = ioread32(fotg210->reg + FOTG210_FIFOCF);
108 val |= FIFOCF_FIFO_EN(epnum - 1);
109 iowrite32(val, fotg210->reg + FOTG210_FIFOCF);
110 }
111
112 static void fotg210_set_fifo_dir(struct fotg210_ep *ep, u32 epnum, u32 dir_in)
113 {
114 struct fotg210_udc *fotg210 = ep->fotg210;
115 u32 val;
116
117 val = ioread32(fotg210->reg + FOTG210_FIFOMAP);
118 val |= (dir_in ? FIFOMAP_DIRIN(epnum - 1) : FIFOMAP_DIROUT(epnum - 1));
119 iowrite32(val, fotg210->reg + FOTG210_FIFOMAP);
120 }
121
122 static void fotg210_set_tfrtype(struct fotg210_ep *ep, u32 epnum, u32 type)
123 {
124 struct fotg210_udc *fotg210 = ep->fotg210;
125 u32 val;
126
127 val = ioread32(fotg210->reg + FOTG210_FIFOCF);
128 val |= FIFOCF_TYPE(type, epnum - 1);
129 iowrite32(val, fotg210->reg + FOTG210_FIFOCF);
130 }
131
132 static void fotg210_set_mps(struct fotg210_ep *ep, u32 epnum, u32 mps,
133 u32 dir_in)
134 {
135 struct fotg210_udc *fotg210 = ep->fotg210;
136 u32 val;
137 u32 offset = dir_in ? FOTG210_INEPMPSR(epnum) :
138 FOTG210_OUTEPMPSR(epnum);
139
140 val = ioread32(fotg210->reg + offset);
141 val |= INOUTEPMPSR_MPS(mps);
142 iowrite32(val, fotg210->reg + offset);
143 }
144
145 static int fotg210_config_ep(struct fotg210_ep *ep,
146 const struct usb_endpoint_descriptor *desc)
147 {
148 struct fotg210_udc *fotg210 = ep->fotg210;
149
150 fotg210_set_fifo_dir(ep, ep->epnum, ep->dir_in);
151 fotg210_set_tfrtype(ep, ep->epnum, ep->type);
152 fotg210_set_mps(ep, ep->epnum, ep->ep.maxpacket, ep->dir_in);
153 fotg210_fifo_ep_mapping(ep, ep->epnum, ep->dir_in);
154
155 fotg210->ep[ep->epnum] = ep;
156
157 return 0;
158 }
159
160 static int fotg210_ep_enable(struct usb_ep *_ep,
161 const struct usb_endpoint_descriptor *desc)
162 {
163 struct fotg210_ep *ep;
164
165 ep = container_of(_ep, struct fotg210_ep, ep);
166
167 ep->desc = desc;
168 ep->epnum = usb_endpoint_num(desc);
169 ep->type = usb_endpoint_type(desc);
170 ep->dir_in = usb_endpoint_dir_in(desc);
171 ep->ep.maxpacket = usb_endpoint_maxp(desc);
172
173 return fotg210_config_ep(ep, desc);
174 }
175
176 static void fotg210_reset_tseq(struct fotg210_udc *fotg210, u8 epnum)
177 {
178 struct fotg210_ep *ep = fotg210->ep[epnum];
179 u32 value;
180 void __iomem *reg;
181
182 reg = (ep->dir_in) ?
183 fotg210->reg + FOTG210_INEPMPSR(epnum) :
184 fotg210->reg + FOTG210_OUTEPMPSR(epnum);
185
186 /* Note: Driver needs to set and clear INOUTEPMPSR_RESET_TSEQ
187 * bit. Controller wouldn't clear this bit. WTF!!!
188 */
189
190 value = ioread32(reg);
191 value |= INOUTEPMPSR_RESET_TSEQ;
192 iowrite32(value, reg);
193
194 value = ioread32(reg);
195 value &= ~INOUTEPMPSR_RESET_TSEQ;
196 iowrite32(value, reg);
197 }
198
199 static int fotg210_ep_release(struct fotg210_ep *ep)
200 {
201 if (!ep->epnum)
202 return 0;
203 ep->epnum = 0;
204 ep->stall = 0;
205 ep->wedged = 0;
206
207 fotg210_reset_tseq(ep->fotg210, ep->epnum);
208
209 return 0;
210 }
211
212 static int fotg210_ep_disable(struct usb_ep *_ep)
213 {
214 struct fotg210_ep *ep;
215 struct fotg210_request *req;
216 unsigned long flags;
217
218 BUG_ON(!_ep);
219
220 ep = container_of(_ep, struct fotg210_ep, ep);
221
222 while (!list_empty(&ep->queue)) {
223 req = list_entry(ep->queue.next,
224 struct fotg210_request, queue);
225 spin_lock_irqsave(&ep->fotg210->lock, flags);
226 fotg210_done(ep, req, -ECONNRESET);
227 spin_unlock_irqrestore(&ep->fotg210->lock, flags);
228 }
229
230 return fotg210_ep_release(ep);
231 }
232
233 static struct usb_request *fotg210_ep_alloc_request(struct usb_ep *_ep,
234 gfp_t gfp_flags)
235 {
236 struct fotg210_request *req;
237
238 req = kzalloc(sizeof(struct fotg210_request), gfp_flags);
239 if (!req)
240 return NULL;
241
242 INIT_LIST_HEAD(&req->queue);
243
244 return &req->req;
245 }
246
247 static void fotg210_ep_free_request(struct usb_ep *_ep,
248 struct usb_request *_req)
249 {
250 struct fotg210_request *req;
251
252 req = container_of(_req, struct fotg210_request, req);
253 kfree(req);
254 }
255
256 static void fotg210_enable_dma(struct fotg210_ep *ep,
257 dma_addr_t d, u32 len)
258 {
259 u32 value;
260 struct fotg210_udc *fotg210 = ep->fotg210;
261
262 /* set transfer length and direction */
263 value = ioread32(fotg210->reg + FOTG210_DMACPSR1);
264 value &= ~(DMACPSR1_DMA_LEN(0xFFFF) | DMACPSR1_DMA_TYPE(1));
265 value |= DMACPSR1_DMA_LEN(len) | DMACPSR1_DMA_TYPE(ep->dir_in);
266 iowrite32(value, fotg210->reg + FOTG210_DMACPSR1);
267
268 /* set device DMA target FIFO number */
269 value = ioread32(fotg210->reg + FOTG210_DMATFNR);
270 if (ep->epnum)
271 value |= DMATFNR_ACC_FN(ep->epnum - 1);
272 else
273 value |= DMATFNR_ACC_CXF;
274 iowrite32(value, fotg210->reg + FOTG210_DMATFNR);
275
276 /* set DMA memory address */
277 iowrite32(d, fotg210->reg + FOTG210_DMACPSR2);
278
279 /* enable MDMA_EROR and MDMA_CMPLT interrupt */
280 value = ioread32(fotg210->reg + FOTG210_DMISGR2);
281 value &= ~(DMISGR2_MDMA_CMPLT | DMISGR2_MDMA_ERROR);
282 iowrite32(value, fotg210->reg + FOTG210_DMISGR2);
283
284 /* start DMA */
285 value = ioread32(fotg210->reg + FOTG210_DMACPSR1);
286 value |= DMACPSR1_DMA_START;
287 iowrite32(value, fotg210->reg + FOTG210_DMACPSR1);
288 }
289
290 static void fotg210_disable_dma(struct fotg210_ep *ep)
291 {
292 iowrite32(DMATFNR_DISDMA, ep->fotg210->reg + FOTG210_DMATFNR);
293 }
294
295 static void fotg210_wait_dma_done(struct fotg210_ep *ep)
296 {
297 u32 value;
298
299 do {
300 value = ioread32(ep->fotg210->reg + FOTG210_DISGR2);
301 if ((value & DISGR2_USBRST_INT) ||
302 (value & DISGR2_DMA_ERROR))
303 goto dma_reset;
304 } while (!(value & DISGR2_DMA_CMPLT));
305
306 value &= ~DISGR2_DMA_CMPLT;
307 iowrite32(value, ep->fotg210->reg + FOTG210_DISGR2);
308 return;
309
310 dma_reset:
311 value = ioread32(ep->fotg210->reg + FOTG210_DMACPSR1);
312 value |= DMACPSR1_DMA_ABORT;
313 iowrite32(value, ep->fotg210->reg + FOTG210_DMACPSR1);
314
315 /* reset fifo */
316 if (ep->epnum) {
317 value = ioread32(ep->fotg210->reg +
318 FOTG210_FIBCR(ep->epnum - 1));
319 value |= FIBCR_FFRST;
320 iowrite32(value, ep->fotg210->reg +
321 FOTG210_FIBCR(ep->epnum - 1));
322 } else {
323 value = ioread32(ep->fotg210->reg + FOTG210_DCFESR);
324 value |= DCFESR_CX_CLR;
325 iowrite32(value, ep->fotg210->reg + FOTG210_DCFESR);
326 }
327 }
328
329 static void fotg210_start_dma(struct fotg210_ep *ep,
330 struct fotg210_request *req)
331 {
332 dma_addr_t d;
333 u8 *buffer;
334 u32 length;
335
336 if (ep->epnum) {
337 if (ep->dir_in) {
338 buffer = req->req.buf;
339 length = req->req.length;
340 } else {
341 buffer = req->req.buf + req->req.actual;
342 length = ioread32(ep->fotg210->reg +
343 FOTG210_FIBCR(ep->epnum - 1));
344 length &= FIBCR_BCFX;
345 }
346 } else {
347 buffer = req->req.buf + req->req.actual;
348 if (req->req.length - req->req.actual > ep->ep.maxpacket)
349 length = ep->ep.maxpacket;
350 else
351 length = req->req.length;
352 }
353
354 d = dma_map_single(NULL, buffer, length,
355 ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
356
357 if (dma_mapping_error(NULL, d)) {
358 pr_err("dma_mapping_error\n");
359 return;
360 }
361
362 dma_sync_single_for_device(NULL, d, length,
363 ep->dir_in ? DMA_TO_DEVICE :
364 DMA_FROM_DEVICE);
365
366 fotg210_enable_dma(ep, d, length);
367
368 /* check if dma is done */
369 fotg210_wait_dma_done(ep);
370
371 fotg210_disable_dma(ep);
372
373 /* update actual transfer length */
374 req->req.actual += length;
375
376 dma_unmap_single(NULL, d, length, DMA_TO_DEVICE);
377 }
378
379 static void fotg210_ep0_queue(struct fotg210_ep *ep,
380 struct fotg210_request *req)
381 {
382 if (!req->req.length) {
383 fotg210_done(ep, req, 0);
384 return;
385 }
386 if (ep->dir_in) { /* if IN */
387 fotg210_start_dma(ep, req);
388 if ((req->req.length == req->req.actual) ||
389 (req->req.actual < ep->ep.maxpacket))
390 fotg210_done(ep, req, 0);
391 } else { /* OUT */
392 u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR0);
393
394 value &= ~DMISGR0_MCX_OUT_INT;
395 iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR0);
396 }
397 }
398
399 static int fotg210_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
400 gfp_t gfp_flags)
401 {
402 struct fotg210_ep *ep;
403 struct fotg210_request *req;
404 unsigned long flags;
405 int request = 0;
406
407 ep = container_of(_ep, struct fotg210_ep, ep);
408 req = container_of(_req, struct fotg210_request, req);
409
410 if (ep->fotg210->gadget.speed == USB_SPEED_UNKNOWN)
411 return -ESHUTDOWN;
412
413 spin_lock_irqsave(&ep->fotg210->lock, flags);
414
415 if (list_empty(&ep->queue))
416 request = 1;
417
418 list_add_tail(&req->queue, &ep->queue);
419
420 req->req.actual = 0;
421 req->req.status = -EINPROGRESS;
422
423 if (!ep->epnum) /* ep0 */
424 fotg210_ep0_queue(ep, req);
425 else if (request && !ep->stall)
426 fotg210_enable_fifo_int(ep);
427
428 spin_unlock_irqrestore(&ep->fotg210->lock, flags);
429
430 return 0;
431 }
432
433 static int fotg210_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
434 {
435 struct fotg210_ep *ep;
436 struct fotg210_request *req;
437 unsigned long flags;
438
439 ep = container_of(_ep, struct fotg210_ep, ep);
440 req = container_of(_req, struct fotg210_request, req);
441
442 spin_lock_irqsave(&ep->fotg210->lock, flags);
443 if (!list_empty(&ep->queue))
444 fotg210_done(ep, req, -ECONNRESET);
445 spin_unlock_irqrestore(&ep->fotg210->lock, flags);
446
447 return 0;
448 }
449
450 static void fotg210_set_epnstall(struct fotg210_ep *ep)
451 {
452 struct fotg210_udc *fotg210 = ep->fotg210;
453 u32 value;
454 void __iomem *reg;
455
456 /* check if IN FIFO is empty before stall */
457 if (ep->dir_in) {
458 do {
459 value = ioread32(fotg210->reg + FOTG210_DCFESR);
460 } while (!(value & DCFESR_FIFO_EMPTY(ep->epnum - 1)));
461 }
462
463 reg = (ep->dir_in) ?
464 fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
465 fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
466 value = ioread32(reg);
467 value |= INOUTEPMPSR_STL_EP;
468 iowrite32(value, reg);
469 }
470
471 static void fotg210_clear_epnstall(struct fotg210_ep *ep)
472 {
473 struct fotg210_udc *fotg210 = ep->fotg210;
474 u32 value;
475 void __iomem *reg;
476
477 reg = (ep->dir_in) ?
478 fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
479 fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
480 value = ioread32(reg);
481 value &= ~INOUTEPMPSR_STL_EP;
482 iowrite32(value, reg);
483 }
484
485 static int fotg210_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedge)
486 {
487 struct fotg210_ep *ep;
488 struct fotg210_udc *fotg210;
489 unsigned long flags;
490 int ret = 0;
491
492 ep = container_of(_ep, struct fotg210_ep, ep);
493
494 fotg210 = ep->fotg210;
495
496 spin_lock_irqsave(&ep->fotg210->lock, flags);
497
498 if (value) {
499 fotg210_set_epnstall(ep);
500 ep->stall = 1;
501 if (wedge)
502 ep->wedged = 1;
503 } else {
504 fotg210_reset_tseq(fotg210, ep->epnum);
505 fotg210_clear_epnstall(ep);
506 ep->stall = 0;
507 ep->wedged = 0;
508 if (!list_empty(&ep->queue))
509 fotg210_enable_fifo_int(ep);
510 }
511
512 spin_unlock_irqrestore(&ep->fotg210->lock, flags);
513 return ret;
514 }
515
516 static int fotg210_ep_set_halt(struct usb_ep *_ep, int value)
517 {
518 return fotg210_set_halt_and_wedge(_ep, value, 0);
519 }
520
521 static int fotg210_ep_set_wedge(struct usb_ep *_ep)
522 {
523 return fotg210_set_halt_and_wedge(_ep, 1, 1);
524 }
525
526 static void fotg210_ep_fifo_flush(struct usb_ep *_ep)
527 {
528 }
529
530 static const struct usb_ep_ops fotg210_ep_ops = {
531 .enable = fotg210_ep_enable,
532 .disable = fotg210_ep_disable,
533
534 .alloc_request = fotg210_ep_alloc_request,
535 .free_request = fotg210_ep_free_request,
536
537 .queue = fotg210_ep_queue,
538 .dequeue = fotg210_ep_dequeue,
539
540 .set_halt = fotg210_ep_set_halt,
541 .fifo_flush = fotg210_ep_fifo_flush,
542 .set_wedge = fotg210_ep_set_wedge,
543 };
544
545 static void fotg210_clear_tx0byte(struct fotg210_udc *fotg210)
546 {
547 u32 value = ioread32(fotg210->reg + FOTG210_TX0BYTE);
548
549 value &= ~(TX0BYTE_EP1 | TX0BYTE_EP2 | TX0BYTE_EP3
550 | TX0BYTE_EP4);
551 iowrite32(value, fotg210->reg + FOTG210_TX0BYTE);
552 }
553
554 static void fotg210_clear_rx0byte(struct fotg210_udc *fotg210)
555 {
556 u32 value = ioread32(fotg210->reg + FOTG210_RX0BYTE);
557
558 value &= ~(RX0BYTE_EP1 | RX0BYTE_EP2 | RX0BYTE_EP3
559 | RX0BYTE_EP4);
560 iowrite32(value, fotg210->reg + FOTG210_RX0BYTE);
561 }
562
563 /* read 8-byte setup packet only */
564 static void fotg210_rdsetupp(struct fotg210_udc *fotg210,
565 u8 *buffer)
566 {
567 int i = 0;
568 u8 *tmp = buffer;
569 u32 data;
570 u32 length = 8;
571
572 iowrite32(DMATFNR_ACC_CXF, fotg210->reg + FOTG210_DMATFNR);
573
574 for (i = (length >> 2); i > 0; i--) {
575 data = ioread32(fotg210->reg + FOTG210_CXPORT);
576 *tmp = data & 0xFF;
577 *(tmp + 1) = (data >> 8) & 0xFF;
578 *(tmp + 2) = (data >> 16) & 0xFF;
579 *(tmp + 3) = (data >> 24) & 0xFF;
580 tmp = tmp + 4;
581 }
582
583 switch (length % 4) {
584 case 1:
585 data = ioread32(fotg210->reg + FOTG210_CXPORT);
586 *tmp = data & 0xFF;
587 break;
588 case 2:
589 data = ioread32(fotg210->reg + FOTG210_CXPORT);
590 *tmp = data & 0xFF;
591 *(tmp + 1) = (data >> 8) & 0xFF;
592 break;
593 case 3:
594 data = ioread32(fotg210->reg + FOTG210_CXPORT);
595 *tmp = data & 0xFF;
596 *(tmp + 1) = (data >> 8) & 0xFF;
597 *(tmp + 2) = (data >> 16) & 0xFF;
598 break;
599 default:
600 break;
601 }
602
603 iowrite32(DMATFNR_DISDMA, fotg210->reg + FOTG210_DMATFNR);
604 }
605
606 static void fotg210_set_configuration(struct fotg210_udc *fotg210)
607 {
608 u32 value = ioread32(fotg210->reg + FOTG210_DAR);
609
610 value |= DAR_AFT_CONF;
611 iowrite32(value, fotg210->reg + FOTG210_DAR);
612 }
613
614 static void fotg210_set_dev_addr(struct fotg210_udc *fotg210, u32 addr)
615 {
616 u32 value = ioread32(fotg210->reg + FOTG210_DAR);
617
618 value |= (addr & 0x7F);
619 iowrite32(value, fotg210->reg + FOTG210_DAR);
620 }
621
622 static void fotg210_set_cxstall(struct fotg210_udc *fotg210)
623 {
624 u32 value = ioread32(fotg210->reg + FOTG210_DCFESR);
625
626 value |= DCFESR_CX_STL;
627 iowrite32(value, fotg210->reg + FOTG210_DCFESR);
628 }
629
630 static void fotg210_request_error(struct fotg210_udc *fotg210)
631 {
632 fotg210_set_cxstall(fotg210);
633 pr_err("request error!!\n");
634 }
635
636 static void fotg210_set_address(struct fotg210_udc *fotg210,
637 struct usb_ctrlrequest *ctrl)
638 {
639 if (ctrl->wValue >= 0x0100) {
640 fotg210_request_error(fotg210);
641 } else {
642 fotg210_set_dev_addr(fotg210, ctrl->wValue);
643 fotg210_set_cxdone(fotg210);
644 }
645 }
646
647 static void fotg210_set_feature(struct fotg210_udc *fotg210,
648 struct usb_ctrlrequest *ctrl)
649 {
650 switch (ctrl->bRequestType & USB_RECIP_MASK) {
651 case USB_RECIP_DEVICE:
652 fotg210_set_cxdone(fotg210);
653 break;
654 case USB_RECIP_INTERFACE:
655 fotg210_set_cxdone(fotg210);
656 break;
657 case USB_RECIP_ENDPOINT: {
658 u8 epnum;
659 epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
660 if (epnum)
661 fotg210_set_epnstall(fotg210->ep[epnum]);
662 else
663 fotg210_set_cxstall(fotg210);
664 fotg210_set_cxdone(fotg210);
665 }
666 break;
667 default:
668 fotg210_request_error(fotg210);
669 break;
670 }
671 }
672
673 static void fotg210_clear_feature(struct fotg210_udc *fotg210,
674 struct usb_ctrlrequest *ctrl)
675 {
676 struct fotg210_ep *ep =
677 fotg210->ep[ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK];
678
679 switch (ctrl->bRequestType & USB_RECIP_MASK) {
680 case USB_RECIP_DEVICE:
681 fotg210_set_cxdone(fotg210);
682 break;
683 case USB_RECIP_INTERFACE:
684 fotg210_set_cxdone(fotg210);
685 break;
686 case USB_RECIP_ENDPOINT:
687 if (ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK) {
688 if (ep->wedged) {
689 fotg210_set_cxdone(fotg210);
690 break;
691 }
692 if (ep->stall)
693 fotg210_set_halt_and_wedge(&ep->ep, 0, 0);
694 }
695 fotg210_set_cxdone(fotg210);
696 break;
697 default:
698 fotg210_request_error(fotg210);
699 break;
700 }
701 }
702
703 static int fotg210_is_epnstall(struct fotg210_ep *ep)
704 {
705 struct fotg210_udc *fotg210 = ep->fotg210;
706 u32 value;
707 void __iomem *reg;
708
709 reg = (ep->dir_in) ?
710 fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
711 fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
712 value = ioread32(reg);
713 return value & INOUTEPMPSR_STL_EP ? 1 : 0;
714 }
715
716 static void fotg210_get_status(struct fotg210_udc *fotg210,
717 struct usb_ctrlrequest *ctrl)
718 {
719 u8 epnum;
720
721 switch (ctrl->bRequestType & USB_RECIP_MASK) {
722 case USB_RECIP_DEVICE:
723 fotg210->ep0_data = 1 << USB_DEVICE_SELF_POWERED;
724 break;
725 case USB_RECIP_INTERFACE:
726 fotg210->ep0_data = 0;
727 break;
728 case USB_RECIP_ENDPOINT:
729 epnum = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK;
730 if (epnum)
731 fotg210->ep0_data =
732 fotg210_is_epnstall(fotg210->ep[epnum])
733 << USB_ENDPOINT_HALT;
734 else
735 fotg210_request_error(fotg210);
736 break;
737
738 default:
739 fotg210_request_error(fotg210);
740 return; /* exit */
741 }
742
743 fotg210->ep0_req->buf = &fotg210->ep0_data;
744 fotg210->ep0_req->length = 2;
745
746 spin_unlock(&fotg210->lock);
747 fotg210_ep_queue(fotg210->gadget.ep0, fotg210->ep0_req, GFP_KERNEL);
748 spin_lock(&fotg210->lock);
749 }
750
751 static int fotg210_setup_packet(struct fotg210_udc *fotg210,
752 struct usb_ctrlrequest *ctrl)
753 {
754 u8 *p = (u8 *)ctrl;
755 u8 ret = 0;
756
757 fotg210_rdsetupp(fotg210, p);
758
759 fotg210->ep[0]->dir_in = ctrl->bRequestType & USB_DIR_IN;
760
761 if (fotg210->gadget.speed == USB_SPEED_UNKNOWN) {
762 u32 value = ioread32(fotg210->reg + FOTG210_DMCR);
763 fotg210->gadget.speed = value & DMCR_HS_EN ?
764 USB_SPEED_HIGH : USB_SPEED_FULL;
765 }
766
767 /* check request */
768 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
769 switch (ctrl->bRequest) {
770 case USB_REQ_GET_STATUS:
771 fotg210_get_status(fotg210, ctrl);
772 break;
773 case USB_REQ_CLEAR_FEATURE:
774 fotg210_clear_feature(fotg210, ctrl);
775 break;
776 case USB_REQ_SET_FEATURE:
777 fotg210_set_feature(fotg210, ctrl);
778 break;
779 case USB_REQ_SET_ADDRESS:
780 fotg210_set_address(fotg210, ctrl);
781 break;
782 case USB_REQ_SET_CONFIGURATION:
783 fotg210_set_configuration(fotg210);
784 ret = 1;
785 break;
786 default:
787 ret = 1;
788 break;
789 }
790 } else {
791 ret = 1;
792 }
793
794 return ret;
795 }
796
797 static void fotg210_ep0out(struct fotg210_udc *fotg210)
798 {
799 struct fotg210_ep *ep = fotg210->ep[0];
800
801 if (!list_empty(&ep->queue) && !ep->dir_in) {
802 struct fotg210_request *req;
803
804 req = list_first_entry(&ep->queue,
805 struct fotg210_request, queue);
806
807 if (req->req.length)
808 fotg210_start_dma(ep, req);
809
810 if ((req->req.length - req->req.actual) < ep->ep.maxpacket)
811 fotg210_done(ep, req, 0);
812 } else {
813 pr_err("%s : empty queue\n", __func__);
814 }
815 }
816
817 static void fotg210_ep0in(struct fotg210_udc *fotg210)
818 {
819 struct fotg210_ep *ep = fotg210->ep[0];
820
821 if ((!list_empty(&ep->queue)) && (ep->dir_in)) {
822 struct fotg210_request *req;
823
824 req = list_entry(ep->queue.next,
825 struct fotg210_request, queue);
826
827 if (req->req.length)
828 fotg210_start_dma(ep, req);
829
830 if ((req->req.length - req->req.actual) < ep->ep.maxpacket)
831 fotg210_done(ep, req, 0);
832 } else {
833 fotg210_set_cxdone(fotg210);
834 }
835 }
836
837 static void fotg210_clear_comabt_int(struct fotg210_udc *fotg210)
838 {
839 u32 value = ioread32(fotg210->reg + FOTG210_DISGR0);
840
841 value &= ~DISGR0_CX_COMABT_INT;
842 iowrite32(value, fotg210->reg + FOTG210_DISGR0);
843 }
844
845 static void fotg210_in_fifo_handler(struct fotg210_ep *ep)
846 {
847 struct fotg210_request *req = list_entry(ep->queue.next,
848 struct fotg210_request, queue);
849
850 if (req->req.length)
851 fotg210_start_dma(ep, req);
852 fotg210_done(ep, req, 0);
853 }
854
855 static void fotg210_out_fifo_handler(struct fotg210_ep *ep)
856 {
857 struct fotg210_request *req = list_entry(ep->queue.next,
858 struct fotg210_request, queue);
859
860 fotg210_start_dma(ep, req);
861
862 /* finish out transfer */
863 if (req->req.length == req->req.actual ||
864 req->req.actual < ep->ep.maxpacket)
865 fotg210_done(ep, req, 0);
866 }
867
868 static irqreturn_t fotg210_irq(int irq, void *_fotg210)
869 {
870 struct fotg210_udc *fotg210 = _fotg210;
871 u32 int_grp = ioread32(fotg210->reg + FOTG210_DIGR);
872 u32 int_msk = ioread32(fotg210->reg + FOTG210_DMIGR);
873
874 int_grp &= ~int_msk;
875
876 spin_lock(&fotg210->lock);
877
878 if (int_grp & DIGR_INT_G2) {
879 void __iomem *reg = fotg210->reg + FOTG210_DISGR2;
880 u32 int_grp2 = ioread32(reg);
881 u32 int_msk2 = ioread32(fotg210->reg + FOTG210_DMISGR2);
882 u32 value;
883
884 int_grp2 &= ~int_msk2;
885
886 if (int_grp2 & DISGR2_USBRST_INT) {
887 value = ioread32(reg);
888 value &= ~DISGR2_USBRST_INT;
889 iowrite32(value, reg);
890 pr_info("fotg210 udc reset\n");
891 }
892 if (int_grp2 & DISGR2_SUSP_INT) {
893 value = ioread32(reg);
894 value &= ~DISGR2_SUSP_INT;
895 iowrite32(value, reg);
896 pr_info("fotg210 udc suspend\n");
897 }
898 if (int_grp2 & DISGR2_RESM_INT) {
899 value = ioread32(reg);
900 value &= ~DISGR2_RESM_INT;
901 iowrite32(value, reg);
902 pr_info("fotg210 udc resume\n");
903 }
904 if (int_grp2 & DISGR2_ISO_SEQ_ERR_INT) {
905 value = ioread32(reg);
906 value &= ~DISGR2_ISO_SEQ_ERR_INT;
907 iowrite32(value, reg);
908 pr_info("fotg210 iso sequence error\n");
909 }
910 if (int_grp2 & DISGR2_ISO_SEQ_ABORT_INT) {
911 value = ioread32(reg);
912 value &= ~DISGR2_ISO_SEQ_ABORT_INT;
913 iowrite32(value, reg);
914 pr_info("fotg210 iso sequence abort\n");
915 }
916 if (int_grp2 & DISGR2_TX0BYTE_INT) {
917 fotg210_clear_tx0byte(fotg210);
918 value = ioread32(reg);
919 value &= ~DISGR2_TX0BYTE_INT;
920 iowrite32(value, reg);
921 pr_info("fotg210 transferred 0 byte\n");
922 }
923 if (int_grp2 & DISGR2_RX0BYTE_INT) {
924 fotg210_clear_rx0byte(fotg210);
925 value = ioread32(reg);
926 value &= ~DISGR2_RX0BYTE_INT;
927 iowrite32(value, reg);
928 pr_info("fotg210 received 0 byte\n");
929 }
930 if (int_grp2 & DISGR2_DMA_ERROR) {
931 value = ioread32(reg);
932 value &= ~DISGR2_DMA_ERROR;
933 iowrite32(value, reg);
934 }
935 }
936
937 if (int_grp & DIGR_INT_G0) {
938 void __iomem *reg = fotg210->reg + FOTG210_DISGR0;
939 u32 int_grp0 = ioread32(reg);
940 u32 int_msk0 = ioread32(fotg210->reg + FOTG210_DMISGR0);
941 struct usb_ctrlrequest ctrl;
942
943 int_grp0 &= ~int_msk0;
944
945 /* the highest priority in this source register */
946 if (int_grp0 & DISGR0_CX_COMABT_INT) {
947 fotg210_clear_comabt_int(fotg210);
948 pr_info("fotg210 CX command abort\n");
949 }
950
951 if (int_grp0 & DISGR0_CX_SETUP_INT) {
952 if (fotg210_setup_packet(fotg210, &ctrl)) {
953 spin_unlock(&fotg210->lock);
954 if (fotg210->driver->setup(&fotg210->gadget,
955 &ctrl) < 0)
956 fotg210_set_cxstall(fotg210);
957 spin_lock(&fotg210->lock);
958 }
959 }
960 if (int_grp0 & DISGR0_CX_COMEND_INT)
961 pr_info("fotg210 cmd end\n");
962
963 if (int_grp0 & DISGR0_CX_IN_INT)
964 fotg210_ep0in(fotg210);
965
966 if (int_grp0 & DISGR0_CX_OUT_INT)
967 fotg210_ep0out(fotg210);
968
969 if (int_grp0 & DISGR0_CX_COMFAIL_INT) {
970 fotg210_set_cxstall(fotg210);
971 pr_info("fotg210 ep0 fail\n");
972 }
973 }
974
975 if (int_grp & DIGR_INT_G1) {
976 void __iomem *reg = fotg210->reg + FOTG210_DISGR1;
977 u32 int_grp1 = ioread32(reg);
978 u32 int_msk1 = ioread32(fotg210->reg + FOTG210_DMISGR1);
979 int fifo;
980
981 int_grp1 &= ~int_msk1;
982
983 for (fifo = 0; fifo < FOTG210_MAX_FIFO_NUM; fifo++) {
984 if (int_grp1 & DISGR1_IN_INT(fifo))
985 fotg210_in_fifo_handler(fotg210->ep[fifo + 1]);
986
987 if ((int_grp1 & DISGR1_OUT_INT(fifo)) ||
988 (int_grp1 & DISGR1_SPK_INT(fifo)))
989 fotg210_out_fifo_handler(fotg210->ep[fifo + 1]);
990 }
991 }
992
993 spin_unlock(&fotg210->lock);
994
995 return IRQ_HANDLED;
996 }
997
998 static void fotg210_disable_unplug(struct fotg210_udc *fotg210)
999 {
1000 u32 reg = ioread32(fotg210->reg + FOTG210_PHYTMSR);
1001
1002 reg &= ~PHYTMSR_UNPLUG;
1003 iowrite32(reg, fotg210->reg + FOTG210_PHYTMSR);
1004 }
1005
1006 static int fotg210_udc_start(struct usb_gadget *g,
1007 struct usb_gadget_driver *driver)
1008 {
1009 struct fotg210_udc *fotg210 = gadget_to_fotg210(g);
1010 u32 value;
1011
1012 /* hook up the driver */
1013 driver->driver.bus = NULL;
1014 fotg210->driver = driver;
1015
1016 /* enable device global interrupt */
1017 value = ioread32(fotg210->reg + FOTG210_DMCR);
1018 value |= DMCR_GLINT_EN;
1019 iowrite32(value, fotg210->reg + FOTG210_DMCR);
1020
1021 return 0;
1022 }
1023
1024 static void fotg210_init(struct fotg210_udc *fotg210)
1025 {
1026 u32 value;
1027
1028 /* disable global interrupt and set int polarity to active high */
1029 iowrite32(GMIR_MHC_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY,
1030 fotg210->reg + FOTG210_GMIR);
1031
1032 /* disable device global interrupt */
1033 value = ioread32(fotg210->reg + FOTG210_DMCR);
1034 value &= ~DMCR_GLINT_EN;
1035 iowrite32(value, fotg210->reg + FOTG210_DMCR);
1036
1037 /* disable all fifo interrupt */
1038 iowrite32(~(u32)0, fotg210->reg + FOTG210_DMISGR1);
1039
1040 /* disable cmd end */
1041 value = ioread32(fotg210->reg + FOTG210_DMISGR0);
1042 value |= DMISGR0_MCX_COMEND;
1043 iowrite32(value, fotg210->reg + FOTG210_DMISGR0);
1044 }
1045
1046 static int fotg210_udc_stop(struct usb_gadget *g)
1047 {
1048 struct fotg210_udc *fotg210 = gadget_to_fotg210(g);
1049 unsigned long flags;
1050
1051 spin_lock_irqsave(&fotg210->lock, flags);
1052
1053 fotg210_init(fotg210);
1054 fotg210->driver = NULL;
1055
1056 spin_unlock_irqrestore(&fotg210->lock, flags);
1057
1058 return 0;
1059 }
1060
1061 static const struct usb_gadget_ops fotg210_gadget_ops = {
1062 .udc_start = fotg210_udc_start,
1063 .udc_stop = fotg210_udc_stop,
1064 };
1065
1066 static int fotg210_udc_remove(struct platform_device *pdev)
1067 {
1068 struct fotg210_udc *fotg210 = platform_get_drvdata(pdev);
1069
1070 usb_del_gadget_udc(&fotg210->gadget);
1071 iounmap(fotg210->reg);
1072 free_irq(platform_get_irq(pdev, 0), fotg210);
1073
1074 fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
1075 kfree(fotg210);
1076
1077 return 0;
1078 }
1079
1080 static int fotg210_udc_probe(struct platform_device *pdev)
1081 {
1082 struct resource *res, *ires;
1083 struct fotg210_udc *fotg210 = NULL;
1084 struct fotg210_ep *_ep[FOTG210_MAX_NUM_EP];
1085 int ret = 0;
1086 int i;
1087
1088 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1089 if (!res) {
1090 pr_err("platform_get_resource error.\n");
1091 return -ENODEV;
1092 }
1093
1094 ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1095 if (!ires) {
1096 pr_err("platform_get_resource IORESOURCE_IRQ error.\n");
1097 return -ENODEV;
1098 }
1099
1100 ret = -ENOMEM;
1101
1102 /* initialize udc */
1103 fotg210 = kzalloc(sizeof(struct fotg210_udc), GFP_KERNEL);
1104 if (fotg210 == NULL)
1105 goto err_alloc;
1106
1107 for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
1108 _ep[i] = kzalloc(sizeof(struct fotg210_ep), GFP_KERNEL);
1109 if (_ep[i] == NULL)
1110 goto err_alloc;
1111 fotg210->ep[i] = _ep[i];
1112 }
1113
1114 fotg210->reg = ioremap(res->start, resource_size(res));
1115 if (fotg210->reg == NULL) {
1116 pr_err("ioremap error.\n");
1117 goto err_map;
1118 }
1119
1120 spin_lock_init(&fotg210->lock);
1121
1122 platform_set_drvdata(pdev, fotg210);
1123
1124 fotg210->gadget.ops = &fotg210_gadget_ops;
1125
1126 fotg210->gadget.max_speed = USB_SPEED_HIGH;
1127 fotg210->gadget.dev.parent = &pdev->dev;
1128 fotg210->gadget.dev.dma_mask = pdev->dev.dma_mask;
1129 fotg210->gadget.name = udc_name;
1130
1131 INIT_LIST_HEAD(&fotg210->gadget.ep_list);
1132
1133 for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
1134 struct fotg210_ep *ep = fotg210->ep[i];
1135
1136 if (i) {
1137 INIT_LIST_HEAD(&fotg210->ep[i]->ep.ep_list);
1138 list_add_tail(&fotg210->ep[i]->ep.ep_list,
1139 &fotg210->gadget.ep_list);
1140 }
1141 ep->fotg210 = fotg210;
1142 INIT_LIST_HEAD(&ep->queue);
1143 ep->ep.name = fotg210_ep_name[i];
1144 ep->ep.ops = &fotg210_ep_ops;
1145 usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
1146
1147 if (i == 0) {
1148 ep->ep.caps.type_control = true;
1149 } else {
1150 ep->ep.caps.type_iso = true;
1151 ep->ep.caps.type_bulk = true;
1152 ep->ep.caps.type_int = true;
1153 }
1154
1155 ep->ep.caps.dir_in = true;
1156 ep->ep.caps.dir_out = true;
1157 }
1158 usb_ep_set_maxpacket_limit(&fotg210->ep[0]->ep, 0x40);
1159 fotg210->gadget.ep0 = &fotg210->ep[0]->ep;
1160 INIT_LIST_HEAD(&fotg210->gadget.ep0->ep_list);
1161
1162 fotg210->ep0_req = fotg210_ep_alloc_request(&fotg210->ep[0]->ep,
1163 GFP_KERNEL);
1164 if (fotg210->ep0_req == NULL)
1165 goto err_req;
1166
1167 fotg210_init(fotg210);
1168
1169 fotg210_disable_unplug(fotg210);
1170
1171 ret = request_irq(ires->start, fotg210_irq, IRQF_SHARED,
1172 udc_name, fotg210);
1173 if (ret < 0) {
1174 pr_err("request_irq error (%d)\n", ret);
1175 goto err_req;
1176 }
1177
1178 ret = usb_add_gadget_udc(&pdev->dev, &fotg210->gadget);
1179 if (ret)
1180 goto err_add_udc;
1181
1182 dev_info(&pdev->dev, "version %s\n", DRIVER_VERSION);
1183
1184 return 0;
1185
1186 err_add_udc:
1187 free_irq(ires->start, fotg210);
1188
1189 err_req:
1190 fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
1191
1192 err_map:
1193 if (fotg210->reg)
1194 iounmap(fotg210->reg);
1195
1196 err_alloc:
1197 kfree(fotg210);
1198
1199 return ret;
1200 }
1201
1202 static struct platform_driver fotg210_driver = {
1203 .driver = {
1204 .name = (char *)udc_name,
1205 },
1206 .probe = fotg210_udc_probe,
1207 .remove = fotg210_udc_remove,
1208 };
1209
1210 module_platform_driver(fotg210_driver);
1211
1212 MODULE_AUTHOR("Yuan-Hsin Chen, Feng-Hsin Chiang <john453@faraday-tech.com>");
1213 MODULE_LICENSE("GPL");
1214 MODULE_DESCRIPTION(DRIVER_DESC);
Linux with added FPC-III support