?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Avoid beyond bounds copy while caching ACL
[zen-stable.git] / drivers / usb / renesas_usbhs / fifo.c
blob72339bd6fcab862565ee222aa4ead450f1d2945d
1 /*
2 * Renesas USB driver
3 *
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
15 *
16 */
17 #include <linux/delay.h>
18 #include <linux/io.h>
19 #include <linux/scatterlist.h>
20 #include "./common.h"
21 #include "./pipe.h"
22
23 #define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
24 #define usbhsf_get_d0fifo(p) (&((p)->fifo_info.d0fifo))
25 #define usbhsf_get_d1fifo(p) (&((p)->fifo_info.d1fifo))
26
27 #define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
28
29 /*
30 * packet initialize
31 */
32 void usbhs_pkt_init(struct usbhs_pkt *pkt)
33 {
34 pkt->dma = DMA_ADDR_INVALID;
35 INIT_LIST_HEAD(&pkt->node);
36 }
37
38 /*
39 * packet control function
40 */
41 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
42 {
43 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
44 struct device *dev = usbhs_priv_to_dev(priv);
45
46 dev_err(dev, "null handler\n");
47
48 return -EINVAL;
49 }
50
51 static struct usbhs_pkt_handle usbhsf_null_handler = {
52 .prepare = usbhsf_null_handle,
53 .try_run = usbhsf_null_handle,
54 };
55
56 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
57 void (*done)(struct usbhs_priv *priv,
58 struct usbhs_pkt *pkt),
59 void *buf, int len, int zero, int sequence)
60 {
61 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
62 struct device *dev = usbhs_priv_to_dev(priv);
63 unsigned long flags;
64
65 if (!done) {
66 dev_err(dev, "no done function\n");
67 return;
68 }
69
70 /******************** spin lock ********************/
71 usbhs_lock(priv, flags);
72
73 if (!pipe->handler) {
74 dev_err(dev, "no handler function\n");
75 pipe->handler = &usbhsf_null_handler;
76 }
77
78 list_del_init(&pkt->node);
79 list_add_tail(&pkt->node, &pipe->list);
80
81 /*
82 * each pkt must hold own handler.
83 * because handler might be changed by its situation.
84 * dma handler -> pio handler.
85 */
86 pkt->pipe = pipe;
87 pkt->buf = buf;
88 pkt->handler = pipe->handler;
89 pkt->length = len;
90 pkt->zero = zero;
91 pkt->actual = 0;
92 pkt->done = done;
93 pkt->sequence = sequence;
94
95 usbhs_unlock(priv, flags);
96 /******************** spin unlock ******************/
97 }
98
99 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
100 {
101 list_del_init(&pkt->node);
102 }
103
104 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
105 {
106 if (list_empty(&pipe->list))
107 return NULL;
108
109 return list_entry(pipe->list.next, struct usbhs_pkt, node);
110 }
111
112 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
113 {
114 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
115 unsigned long flags;
116
117 /******************** spin lock ********************/
118 usbhs_lock(priv, flags);
119
120 if (!pkt)
121 pkt = __usbhsf_pkt_get(pipe);
122
123 if (pkt)
124 __usbhsf_pkt_del(pkt);
125
126 usbhs_unlock(priv, flags);
127 /******************** spin unlock ******************/
128
129 return pkt;
130 }
131
132 enum {
133 USBHSF_PKT_PREPARE,
134 USBHSF_PKT_TRY_RUN,
135 USBHSF_PKT_DMA_DONE,
136 };
137
138 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
139 {
140 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
141 struct usbhs_pkt *pkt;
142 struct device *dev = usbhs_priv_to_dev(priv);
143 int (*func)(struct usbhs_pkt *pkt, int *is_done);
144 unsigned long flags;
145 int ret = 0;
146 int is_done = 0;
147
148 /******************** spin lock ********************/
149 usbhs_lock(priv, flags);
150
151 pkt = __usbhsf_pkt_get(pipe);
152 if (!pkt)
153 goto __usbhs_pkt_handler_end;
154
155 switch (type) {
156 case USBHSF_PKT_PREPARE:
157 func = pkt->handler->prepare;
158 break;
159 case USBHSF_PKT_TRY_RUN:
160 func = pkt->handler->try_run;
161 break;
162 case USBHSF_PKT_DMA_DONE:
163 func = pkt->handler->dma_done;
164 break;
165 default:
166 dev_err(dev, "unknown pkt hander\n");
167 goto __usbhs_pkt_handler_end;
168 }
169
170 ret = func(pkt, &is_done);
171
172 if (is_done)
173 __usbhsf_pkt_del(pkt);
174
175 __usbhs_pkt_handler_end:
176 usbhs_unlock(priv, flags);
177 /******************** spin unlock ******************/
178
179 if (is_done) {
180 pkt->done(priv, pkt);
181 usbhs_pkt_start(pipe);
182 }
183
184 return ret;
185 }
186
187 void usbhs_pkt_start(struct usbhs_pipe *pipe)
188 {
189 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
190 }
191
192 /*
193 * irq enable/disable function
194 */
195 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, bempsts, e)
196 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, brdysts, e)
197 #define usbhsf_irq_callback_ctrl(pipe, status, enable) \
198 ({ \
199 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
200 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
201 u16 status = (1 << usbhs_pipe_number(pipe)); \
202 if (!mod) \
203 return; \
204 if (enable) \
205 mod->irq_##status |= status; \
206 else \
207 mod->irq_##status &= ~status; \
208 usbhs_irq_callback_update(priv, mod); \
209 })
210
211 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
212 {
213 /*
214 * And DCP pipe can NOT use "ready interrupt" for "send"
215 * it should use "empty" interrupt.
216 * see
217 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
218 *
219 * on the other hand, normal pipe can use "ready interrupt" for "send"
220 * even though it is single/double buffer
221 */
222 if (usbhs_pipe_is_dcp(pipe))
223 usbhsf_irq_empty_ctrl(pipe, enable);
224 else
225 usbhsf_irq_ready_ctrl(pipe, enable);
226 }
227
228 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
229 {
230 usbhsf_irq_ready_ctrl(pipe, enable);
231 }
232
233 /*
234 * FIFO ctrl
235 */
236 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
237 struct usbhs_fifo *fifo)
238 {
239 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
240
241 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
242 }
243
244 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
245 struct usbhs_fifo *fifo)
246 {
247 int timeout = 1024;
248
249 do {
250 /* The FIFO port is accessible */
251 if (usbhs_read(priv, fifo->ctr) & FRDY)
252 return 0;
253
254 udelay(10);
255 } while (timeout--);
256
257 return -EBUSY;
258 }
259
260 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
261 struct usbhs_fifo *fifo)
262 {
263 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
264
265 if (!usbhs_pipe_is_dcp(pipe))
266 usbhsf_fifo_barrier(priv, fifo);
267
268 usbhs_write(priv, fifo->ctr, BCLR);
269 }
270
271 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
272 struct usbhs_fifo *fifo)
273 {
274 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
275 }
276
277 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
278 struct usbhs_fifo *fifo)
279 {
280 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
281
282 usbhs_pipe_select_fifo(pipe, NULL);
283 usbhs_write(priv, fifo->sel, 0);
284 }
285
286 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
287 struct usbhs_fifo *fifo,
288 int write)
289 {
290 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
291 struct device *dev = usbhs_priv_to_dev(priv);
292 int timeout = 1024;
293 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
294 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
295
296 if (usbhs_pipe_is_busy(pipe) ||
297 usbhsf_fifo_is_busy(fifo))
298 return -EBUSY;
299
300 if (usbhs_pipe_is_dcp(pipe)) {
301 base |= (1 == write) << 5; /* ISEL */
302
303 if (usbhs_mod_is_host(priv))
304 usbhs_dcp_dir_for_host(pipe, write);
305 }
306
307 /* "base" will be used below */
308 usbhs_write(priv, fifo->sel, base | MBW_32);
309
310 /* check ISEL and CURPIPE value */
311 while (timeout--) {
312 if (base == (mask & usbhs_read(priv, fifo->sel))) {
313 usbhs_pipe_select_fifo(pipe, fifo);
314 return 0;
315 }
316 udelay(10);
317 }
318
319 dev_err(dev, "fifo select error\n");
320
321 return -EIO;
322 }
323
324 /*
325 * DCP status stage
326 */
327 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
328 {
329 struct usbhs_pipe *pipe = pkt->pipe;
330 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
331 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
332 struct device *dev = usbhs_priv_to_dev(priv);
333 int ret;
334
335 usbhs_pipe_disable(pipe);
336
337 ret = usbhsf_fifo_select(pipe, fifo, 1);
338 if (ret < 0) {
339 dev_err(dev, "%s() faile\n", __func__);
340 return ret;
341 }
342
343 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
344
345 usbhsf_fifo_clear(pipe, fifo);
346 usbhsf_send_terminator(pipe, fifo);
347
348 usbhsf_fifo_unselect(pipe, fifo);
349
350 usbhsf_tx_irq_ctrl(pipe, 1);
351 usbhs_pipe_enable(pipe);
352
353 return ret;
354 }
355
356 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
357 {
358 struct usbhs_pipe *pipe = pkt->pipe;
359 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
360 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
361 struct device *dev = usbhs_priv_to_dev(priv);
362 int ret;
363
364 usbhs_pipe_disable(pipe);
365
366 ret = usbhsf_fifo_select(pipe, fifo, 0);
367 if (ret < 0) {
368 dev_err(dev, "%s() fail\n", __func__);
369 return ret;
370 }
371
372 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
373 usbhsf_fifo_clear(pipe, fifo);
374
375 usbhsf_fifo_unselect(pipe, fifo);
376
377 usbhsf_rx_irq_ctrl(pipe, 1);
378 usbhs_pipe_enable(pipe);
379
380 return ret;
381
382 }
383
384 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
385 {
386 struct usbhs_pipe *pipe = pkt->pipe;
387
388 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
389 usbhsf_tx_irq_ctrl(pipe, 0);
390 else
391 usbhsf_rx_irq_ctrl(pipe, 0);
392
393 pkt->actual = pkt->length;
394 *is_done = 1;
395
396 return 0;
397 }
398
399 struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
400 .prepare = usbhs_dcp_dir_switch_to_write,
401 .try_run = usbhs_dcp_dir_switch_done,
402 };
403
404 struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
405 .prepare = usbhs_dcp_dir_switch_to_read,
406 .try_run = usbhs_dcp_dir_switch_done,
407 };
408
409 /*
410 * DCP data stage (push)
411 */
412 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
413 {
414 struct usbhs_pipe *pipe = pkt->pipe;
415
416 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
417
418 /*
419 * change handler to PIO push
420 */
421 pkt->handler = &usbhs_fifo_pio_push_handler;
422
423 return pkt->handler->prepare(pkt, is_done);
424 }
425
426 struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
427 .prepare = usbhsf_dcp_data_stage_try_push,
428 };
429
430 /*
431 * DCP data stage (pop)
432 */
433 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
434 int *is_done)
435 {
436 struct usbhs_pipe *pipe = pkt->pipe;
437 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
438 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
439
440 if (usbhs_pipe_is_busy(pipe))
441 return 0;
442
443 /*
444 * prepare pop for DCP should
445 * - change DCP direction,
446 * - clear fifo
447 * - DATA1
448 */
449 usbhs_pipe_disable(pipe);
450
451 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
452
453 usbhsf_fifo_select(pipe, fifo, 0);
454 usbhsf_fifo_clear(pipe, fifo);
455 usbhsf_fifo_unselect(pipe, fifo);
456
457 /*
458 * change handler to PIO pop
459 */
460 pkt->handler = &usbhs_fifo_pio_pop_handler;
461
462 return pkt->handler->prepare(pkt, is_done);
463 }
464
465 struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
466 .prepare = usbhsf_dcp_data_stage_prepare_pop,
467 };
468
469 /*
470 * PIO push handler
471 */
472 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
473 {
474 struct usbhs_pipe *pipe = pkt->pipe;
475 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
476 struct device *dev = usbhs_priv_to_dev(priv);
477 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
478 void __iomem *addr = priv->base + fifo->port;
479 u8 *buf;
480 int maxp = usbhs_pipe_get_maxpacket(pipe);
481 int total_len;
482 int i, ret, len;
483 int is_short;
484
485 usbhs_pipe_data_sequence(pipe, pkt->sequence);
486 pkt->sequence = -1; /* -1 sequence will be ignored */
487
488 ret = usbhsf_fifo_select(pipe, fifo, 1);
489 if (ret < 0)
490 return 0;
491
492 ret = usbhs_pipe_is_accessible(pipe);
493 if (ret < 0) {
494 /* inaccessible pipe is not an error */
495 ret = 0;
496 goto usbhs_fifo_write_busy;
497 }
498
499 ret = usbhsf_fifo_barrier(priv, fifo);
500 if (ret < 0)
501 goto usbhs_fifo_write_busy;
502
503 buf = pkt->buf + pkt->actual;
504 len = pkt->length - pkt->actual;
505 len = min(len, maxp);
506 total_len = len;
507 is_short = total_len < maxp;
508
509 /*
510 * FIXME
511 *
512 * 32-bit access only
513 */
514 if (len >= 4 && !((unsigned long)buf & 0x03)) {
515 iowrite32_rep(addr, buf, len / 4);
516 len %= 4;
517 buf += total_len - len;
518 }
519
520 /* the rest operation */
521 for (i = 0; i < len; i++)
522 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
523
524 /*
525 * variable update
526 */
527 pkt->actual += total_len;
528
529 if (pkt->actual < pkt->length)
530 *is_done = 0; /* there are remainder data */
531 else if (is_short)
532 *is_done = 1; /* short packet */
533 else
534 *is_done = !pkt->zero; /* send zero packet ? */
535
536 /*
537 * pipe/irq handling
538 */
539 if (is_short)
540 usbhsf_send_terminator(pipe, fifo);
541
542 usbhsf_tx_irq_ctrl(pipe, !*is_done);
543 usbhs_pipe_enable(pipe);
544
545 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
546 usbhs_pipe_number(pipe),
547 pkt->length, pkt->actual, *is_done, pkt->zero);
548
549 /*
550 * Transmission end
551 */
552 if (*is_done) {
553 if (usbhs_pipe_is_dcp(pipe))
554 usbhs_dcp_control_transfer_done(pipe);
555 }
556
557 usbhsf_fifo_unselect(pipe, fifo);
558
559 return 0;
560
561 usbhs_fifo_write_busy:
562 usbhsf_fifo_unselect(pipe, fifo);
563
564 /*
565 * pipe is busy.
566 * retry in interrupt
567 */
568 usbhsf_tx_irq_ctrl(pipe, 1);
569
570 return ret;
571 }
572
573 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
574 .prepare = usbhsf_pio_try_push,
575 .try_run = usbhsf_pio_try_push,
576 };
577
578 /*
579 * PIO pop handler
580 */
581 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
582 {
583 struct usbhs_pipe *pipe = pkt->pipe;
584
585 if (usbhs_pipe_is_busy(pipe))
586 return 0;
587
588 /*
589 * pipe enable to prepare packet receive
590 */
591 usbhs_pipe_data_sequence(pipe, pkt->sequence);
592 pkt->sequence = -1; /* -1 sequence will be ignored */
593
594 usbhs_pipe_enable(pipe);
595 usbhsf_rx_irq_ctrl(pipe, 1);
596
597 return 0;
598 }
599
600 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
601 {
602 struct usbhs_pipe *pipe = pkt->pipe;
603 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
604 struct device *dev = usbhs_priv_to_dev(priv);
605 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
606 void __iomem *addr = priv->base + fifo->port;
607 u8 *buf;
608 u32 data = 0;
609 int maxp = usbhs_pipe_get_maxpacket(pipe);
610 int rcv_len, len;
611 int i, ret;
612 int total_len = 0;
613
614 ret = usbhsf_fifo_select(pipe, fifo, 0);
615 if (ret < 0)
616 return 0;
617
618 ret = usbhsf_fifo_barrier(priv, fifo);
619 if (ret < 0)
620 goto usbhs_fifo_read_busy;
621
622 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
623
624 buf = pkt->buf + pkt->actual;
625 len = pkt->length - pkt->actual;
626 len = min(len, rcv_len);
627 total_len = len;
628
629 /*
630 * update actual length first here to decide disable pipe.
631 * if this pipe keeps BUF status and all data were popped,
632 * then, next interrupt/token will be issued again
633 */
634 pkt->actual += total_len;
635
636 if ((pkt->actual == pkt->length) || /* receive all data */
637 (total_len < maxp)) { /* short packet */
638 *is_done = 1;
639 usbhsf_rx_irq_ctrl(pipe, 0);
640 usbhs_pipe_disable(pipe); /* disable pipe first */
641 }
642
643 /*
644 * Buffer clear if Zero-Length packet
645 *
646 * see
647 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
648 */
649 if (0 == rcv_len) {
650 pkt->zero = 1;
651 usbhsf_fifo_clear(pipe, fifo);
652 goto usbhs_fifo_read_end;
653 }
654
655 /*
656 * FIXME
657 *
658 * 32-bit access only
659 */
660 if (len >= 4 && !((unsigned long)buf & 0x03)) {
661 ioread32_rep(addr, buf, len / 4);
662 len %= 4;
663 buf += total_len - len;
664 }
665
666 /* the rest operation */
667 for (i = 0; i < len; i++) {
668 if (!(i & 0x03))
669 data = ioread32(addr);
670
671 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
672 }
673
674 usbhs_fifo_read_end:
675 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
676 usbhs_pipe_number(pipe),
677 pkt->length, pkt->actual, *is_done, pkt->zero);
678
679 usbhs_fifo_read_busy:
680 usbhsf_fifo_unselect(pipe, fifo);
681
682 return ret;
683 }
684
685 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
686 .prepare = usbhsf_prepare_pop,
687 .try_run = usbhsf_pio_try_pop,
688 };
689
690 /*
691 * DCP ctrol statge handler
692 */
693 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
694 {
695 usbhs_dcp_control_transfer_done(pkt->pipe);
696
697 *is_done = 1;
698
699 return 0;
700 }
701
702 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
703 .prepare = usbhsf_ctrl_stage_end,
704 .try_run = usbhsf_ctrl_stage_end,
705 };
706
707 /*
708 * DMA fifo functions
709 */
710 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
711 struct usbhs_pkt *pkt)
712 {
713 if (&usbhs_fifo_dma_push_handler == pkt->handler)
714 return fifo->tx_chan;
715
716 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
717 return fifo->rx_chan;
718
719 return NULL;
720 }
721
722 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
723 struct usbhs_pkt *pkt)
724 {
725 struct usbhs_fifo *fifo;
726
727 /* DMA :: D0FIFO */
728 fifo = usbhsf_get_d0fifo(priv);
729 if (usbhsf_dma_chan_get(fifo, pkt) &&
730 !usbhsf_fifo_is_busy(fifo))
731 return fifo;
732
733 /* DMA :: D1FIFO */
734 fifo = usbhsf_get_d1fifo(priv);
735 if (usbhsf_dma_chan_get(fifo, pkt) &&
736 !usbhsf_fifo_is_busy(fifo))
737 return fifo;
738
739 return NULL;
740 }
741
742 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
743 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
744 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
745 struct usbhs_fifo *fifo,
746 u16 dreqe)
747 {
748 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
749
750 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
751 }
752
753 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
754 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
755 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
756 {
757 struct usbhs_pipe *pipe = pkt->pipe;
758 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
759 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
760
761 return info->dma_map_ctrl(pkt, map);
762 }
763
764 static void usbhsf_dma_complete(void *arg);
765 static void usbhsf_dma_prepare_tasklet(unsigned long data)
766 {
767 struct usbhs_pkt *pkt = (struct usbhs_pkt *)data;
768 struct usbhs_pipe *pipe = pkt->pipe;
769 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
770 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
771 struct scatterlist sg;
772 struct dma_async_tx_descriptor *desc;
773 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
774 struct device *dev = usbhs_priv_to_dev(priv);
775 enum dma_transfer_direction dir;
776 dma_cookie_t cookie;
777
778 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
779
780 sg_init_table(&sg, 1);
781 sg_set_page(&sg, virt_to_page(pkt->dma),
782 pkt->length, offset_in_page(pkt->dma));
783 sg_dma_address(&sg) = pkt->dma + pkt->actual;
784 sg_dma_len(&sg) = pkt->trans;
785
786 desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir,
787 DMA_PREP_INTERRUPT |
788 DMA_CTRL_ACK);
789 if (!desc)
790 return;
791
792 desc->callback = usbhsf_dma_complete;
793 desc->callback_param = pipe;
794
795 cookie = desc->tx_submit(desc);
796 if (cookie < 0) {
797 dev_err(dev, "Failed to submit dma descriptor\n");
798 return;
799 }
800
801 dev_dbg(dev, " %s %d (%d/ %d)\n",
802 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
803
804 usbhsf_dma_start(pipe, fifo);
805 dma_async_issue_pending(chan);
806 }
807
808 /*
809 * DMA push handler
810 */
811 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
812 {
813 struct usbhs_pipe *pipe = pkt->pipe;
814 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
815 struct usbhs_fifo *fifo;
816 int len = pkt->length - pkt->actual;
817 int ret;
818
819 if (usbhs_pipe_is_busy(pipe))
820 return 0;
821
822 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
823 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
824 usbhs_pipe_is_dcp(pipe))
825 goto usbhsf_pio_prepare_push;
826
827 if (len % 4) /* 32bit alignment */
828 goto usbhsf_pio_prepare_push;
829
830 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
831 goto usbhsf_pio_prepare_push;
832
833 /* get enable DMA fifo */
834 fifo = usbhsf_get_dma_fifo(priv, pkt);
835 if (!fifo)
836 goto usbhsf_pio_prepare_push;
837
838 if (usbhsf_dma_map(pkt) < 0)
839 goto usbhsf_pio_prepare_push;
840
841 ret = usbhsf_fifo_select(pipe, fifo, 0);
842 if (ret < 0)
843 goto usbhsf_pio_prepare_push_unmap;
844
845 pkt->trans = len;
846
847 tasklet_init(&fifo->tasklet,
848 usbhsf_dma_prepare_tasklet,
849 (unsigned long)pkt);
850
851 tasklet_schedule(&fifo->tasklet);
852
853 return 0;
854
855 usbhsf_pio_prepare_push_unmap:
856 usbhsf_dma_unmap(pkt);
857 usbhsf_pio_prepare_push:
858 /*
859 * change handler to PIO
860 */
861 pkt->handler = &usbhs_fifo_pio_push_handler;
862
863 return pkt->handler->prepare(pkt, is_done);
864 }
865
866 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
867 {
868 struct usbhs_pipe *pipe = pkt->pipe;
869
870 pkt->actual = pkt->trans;
871
872 *is_done = !pkt->zero; /* send zero packet ? */
873
874 usbhsf_dma_stop(pipe, pipe->fifo);
875 usbhsf_dma_unmap(pkt);
876 usbhsf_fifo_unselect(pipe, pipe->fifo);
877
878 return 0;
879 }
880
881 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
882 .prepare = usbhsf_dma_prepare_push,
883 .dma_done = usbhsf_dma_push_done,
884 };
885
886 /*
887 * DMA pop handler
888 */
889 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
890 {
891 struct usbhs_pipe *pipe = pkt->pipe;
892 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
893 struct usbhs_fifo *fifo;
894 int len, ret;
895
896 if (usbhs_pipe_is_busy(pipe))
897 return 0;
898
899 if (usbhs_pipe_is_dcp(pipe))
900 goto usbhsf_pio_prepare_pop;
901
902 /* get enable DMA fifo */
903 fifo = usbhsf_get_dma_fifo(priv, pkt);
904 if (!fifo)
905 goto usbhsf_pio_prepare_pop;
906
907 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
908 goto usbhsf_pio_prepare_pop;
909
910 ret = usbhsf_fifo_select(pipe, fifo, 0);
911 if (ret < 0)
912 goto usbhsf_pio_prepare_pop;
913
914 /* use PIO if packet is less than pio_dma_border */
915 len = usbhsf_fifo_rcv_len(priv, fifo);
916 len = min(pkt->length - pkt->actual, len);
917 if (len % 4) /* 32bit alignment */
918 goto usbhsf_pio_prepare_pop_unselect;
919
920 if (len < usbhs_get_dparam(priv, pio_dma_border))
921 goto usbhsf_pio_prepare_pop_unselect;
922
923 ret = usbhsf_fifo_barrier(priv, fifo);
924 if (ret < 0)
925 goto usbhsf_pio_prepare_pop_unselect;
926
927 if (usbhsf_dma_map(pkt) < 0)
928 goto usbhsf_pio_prepare_pop_unselect;
929
930 /* DMA */
931
932 /*
933 * usbhs_fifo_dma_pop_handler :: prepare
934 * enabled irq to come here.
935 * but it is no longer needed for DMA. disable it.
936 */
937 usbhsf_rx_irq_ctrl(pipe, 0);
938
939 pkt->trans = len;
940
941 tasklet_init(&fifo->tasklet,
942 usbhsf_dma_prepare_tasklet,
943 (unsigned long)pkt);
944
945 tasklet_schedule(&fifo->tasklet);
946
947 return 0;
948
949 usbhsf_pio_prepare_pop_unselect:
950 usbhsf_fifo_unselect(pipe, fifo);
951 usbhsf_pio_prepare_pop:
952
953 /*
954 * change handler to PIO
955 */
956 pkt->handler = &usbhs_fifo_pio_pop_handler;
957
958 return pkt->handler->try_run(pkt, is_done);
959 }
960
961 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
962 {
963 struct usbhs_pipe *pipe = pkt->pipe;
964 int maxp = usbhs_pipe_get_maxpacket(pipe);
965
966 usbhsf_dma_stop(pipe, pipe->fifo);
967 usbhsf_dma_unmap(pkt);
968 usbhsf_fifo_unselect(pipe, pipe->fifo);
969
970 pkt->actual += pkt->trans;
971
972 if ((pkt->actual == pkt->length) || /* receive all data */
973 (pkt->trans < maxp)) { /* short packet */
974 *is_done = 1;
975 } else {
976 /* re-enable */
977 usbhsf_prepare_pop(pkt, is_done);
978 }
979
980 return 0;
981 }
982
983 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
984 .prepare = usbhsf_prepare_pop,
985 .try_run = usbhsf_dma_try_pop,
986 .dma_done = usbhsf_dma_pop_done
987 };
988
989 /*
990 * DMA setting
991 */
992 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
993 {
994 struct sh_dmae_slave *slave = param;
995
996 /*
997 * FIXME
998 *
999 * usbhs doesn't recognize id = 0 as valid DMA
1000 */
1001 if (0 == slave->slave_id)
1002 return false;
1003
1004 chan->private = slave;
1005
1006 return true;
1007 }
1008
1009 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1010 {
1011 if (fifo->tx_chan)
1012 dma_release_channel(fifo->tx_chan);
1013 if (fifo->rx_chan)
1014 dma_release_channel(fifo->rx_chan);
1015
1016 fifo->tx_chan = NULL;
1017 fifo->rx_chan = NULL;
1018 }
1019
1020 static void usbhsf_dma_init(struct usbhs_priv *priv,
1021 struct usbhs_fifo *fifo)
1022 {
1023 struct device *dev = usbhs_priv_to_dev(priv);
1024 dma_cap_mask_t mask;
1025
1026 dma_cap_zero(mask);
1027 dma_cap_set(DMA_SLAVE, mask);
1028 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1029 &fifo->tx_slave);
1030
1031 dma_cap_zero(mask);
1032 dma_cap_set(DMA_SLAVE, mask);
1033 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1034 &fifo->rx_slave);
1035
1036 if (fifo->tx_chan || fifo->rx_chan)
1037 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1038 fifo->name,
1039 fifo->tx_chan ? "[TX]" : " ",
1040 fifo->rx_chan ? "[RX]" : " ");
1041 }
1042
1043 /*
1044 * irq functions
1045 */
1046 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1047 struct usbhs_irq_state *irq_state)
1048 {
1049 struct usbhs_pipe *pipe;
1050 struct device *dev = usbhs_priv_to_dev(priv);
1051 int i, ret;
1052
1053 if (!irq_state->bempsts) {
1054 dev_err(dev, "debug %s !!\n", __func__);
1055 return -EIO;
1056 }
1057
1058 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1059
1060 /*
1061 * search interrupted "pipe"
1062 * not "uep".
1063 */
1064 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1065 if (!(irq_state->bempsts & (1 << i)))
1066 continue;
1067
1068 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1069 if (ret < 0)
1070 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1071 }
1072
1073 return 0;
1074 }
1075
1076 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1077 struct usbhs_irq_state *irq_state)
1078 {
1079 struct usbhs_pipe *pipe;
1080 struct device *dev = usbhs_priv_to_dev(priv);
1081 int i, ret;
1082
1083 if (!irq_state->brdysts) {
1084 dev_err(dev, "debug %s !!\n", __func__);
1085 return -EIO;
1086 }
1087
1088 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1089
1090 /*
1091 * search interrupted "pipe"
1092 * not "uep".
1093 */
1094 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1095 if (!(irq_state->brdysts & (1 << i)))
1096 continue;
1097
1098 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1099 if (ret < 0)
1100 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1101 }
1102
1103 return 0;
1104 }
1105
1106 static void usbhsf_dma_complete(void *arg)
1107 {
1108 struct usbhs_pipe *pipe = arg;
1109 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1110 struct device *dev = usbhs_priv_to_dev(priv);
1111 int ret;
1112
1113 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1114 if (ret < 0)
1115 dev_err(dev, "dma_complete run_error %d : %d\n",
1116 usbhs_pipe_number(pipe), ret);
1117 }
1118
1119 /*
1120 * fifo init
1121 */
1122 void usbhs_fifo_init(struct usbhs_priv *priv)
1123 {
1124 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1125 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1126 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
1127 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1128
1129 mod->irq_empty = usbhsf_irq_empty;
1130 mod->irq_ready = usbhsf_irq_ready;
1131 mod->irq_bempsts = 0;
1132 mod->irq_brdysts = 0;
1133
1134 cfifo->pipe = NULL;
1135 cfifo->tx_chan = NULL;
1136 cfifo->rx_chan = NULL;
1137
1138 d0fifo->pipe = NULL;
1139 d0fifo->tx_chan = NULL;
1140 d0fifo->rx_chan = NULL;
1141
1142 d1fifo->pipe = NULL;
1143 d1fifo->tx_chan = NULL;
1144 d1fifo->rx_chan = NULL;
1145
1146 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
1147 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
1148 }
1149
1150 void usbhs_fifo_quit(struct usbhs_priv *priv)
1151 {
1152 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1153
1154 mod->irq_empty = NULL;
1155 mod->irq_ready = NULL;
1156 mod->irq_bempsts = 0;
1157 mod->irq_brdysts = 0;
1158
1159 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
1160 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1161 }
1162
1163 int usbhs_fifo_probe(struct usbhs_priv *priv)
1164 {
1165 struct usbhs_fifo *fifo;
1166
1167 /* CFIFO */
1168 fifo = usbhsf_get_cfifo(priv);
1169 fifo->name = "CFIFO";
1170 fifo->port = CFIFO;
1171 fifo->sel = CFIFOSEL;
1172 fifo->ctr = CFIFOCTR;
1173
1174 /* D0FIFO */
1175 fifo = usbhsf_get_d0fifo(priv);
1176 fifo->name = "D0FIFO";
1177 fifo->port = D0FIFO;
1178 fifo->sel = D0FIFOSEL;
1179 fifo->ctr = D0FIFOCTR;
1180 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id);
1181 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id);
1182
1183 /* D1FIFO */
1184 fifo = usbhsf_get_d1fifo(priv);
1185 fifo->name = "D1FIFO";
1186 fifo->port = D1FIFO;
1187 fifo->sel = D1FIFOSEL;
1188 fifo->ctr = D1FIFOCTR;
1189 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id);
1190 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id);
1191
1192 return 0;
1193 }
1194
1195 void usbhs_fifo_remove(struct usbhs_priv *priv)
1196 {
1197 }